JP6988093B2 - Connection terminal, motor device and wiper motor device - Google Patents

Description

The present invention relates to a connection terminal to a substrate, and more particularly to a connection terminal of a control device of a wiper motor device for swinging and driving a wiper blade that wipes a window of a vehicle.

The wiper motor device for swinging and driving the wiper blade that wipes the window of the vehicle is required to have a long life, but the control device is to supply a relatively large current to the motor body when the wiper is used. While it generates heat, it is cooled when not in use, so this cold cycle may deteriorate the control device. Since the control device is arranged in a closed space, heat tends to be trapped, and an overload current flows through the motor body during snowfall or the like, so that the control device is in a high temperature state during use.

In the wiper motor device of Patent Document 1 below, a connection terminal is provided for supplying power from the circuit board which is a part of the control device to the motor body. This connection terminal is insert-molded on the cover and soldered on the circuit board side. When a thermal cycle is applied to this connection terminal, the linear expansion coefficient of the connection terminal, the expansion coefficient of the circuit board, and the expansion coefficient of the molded resin are different, so the soldered part that electrically connects the connection terminal to the circuit board. There is a risk that stress will be applied to the solder and cause deterioration such as cracks in the solder. Further, since a large current flows through the connection terminal, heat generation becomes large. The means for reducing the stress applied to the soldered portion of the connection terminal is described in References 2 and 3 below, and the means for promoting heat dissipation of the connection terminal is described in References 4 below.

That is, in the following Patent Document 2, in order to prevent deterioration of the soldered portion due to the thermal cycle, the connection terminals are S-shaped (see FIGS. 3 and 7 of Patent Document 2) and U-shaped (see FIG. 5 of Patent Document 2). (Refer to), the shape is bent so that the bent portion in the direction perpendicular to the plate thickness direction and the plate thickness direction bends and deforms to absorb stress.

Further, Patent Document 3 below describes that an S-shaped (FIG. 2 of Patent Document 3) connection terminal is used for the purpose of absorbing vibration. The plate thickness direction of the S-shaped connection terminal coincides with the plate thickness direction of the circuit board.

Further, in the following cited document 4, it is described that in order to improve heat dissipation, a slit (see FIG. 7 (b) of the cited document 4) is provided in the extension portion of the connection terminal to increase the area in contact with the atmosphere. Has been done.

Japanese Unexamined Patent Publication No. 2016-2787 Japanese Unexamined Patent Publication No. 2011-205732 Japanese Unexamined Patent Publication No. 11-275838 Japanese Patent Application Laid-Open No. 2003-324294

In Patent Document 2, the terminal portion is bent in the vertical direction from the main body portion of the plate-shaped conductive plate having a large area, but the linear expansion coefficient of the connection terminal, the expansion coefficient of the circuit board, and the expansion of the molding resin are bent. Since the relationship between the three coefficients is not taken into consideration and the width of the bent portion is narrow, there is a problem in terms of the strength of the terminal portion. Further, in Patent Document 2, although the stress in the plate thickness direction of the terminal portion and the direction orthogonal to the plate thickness direction can be absorbed, the terminal portion is bent in the direction (thickness direction of the substrate, vertical direction). No stress is assumed. Further, the height of the bent portion becomes high in the S-shaped terminal portion, and the height in the lower portion becomes high in the U-shaped terminal portion. Further, although the main body of the plate-shaped conductive plate having a large area has a heat dissipation effect, no heat generation countermeasure is taken for the terminal portion.

In the above Patent Document 3, the relationship between the linear expansion coefficient of the connection terminal, the expansion coefficient of the circuit board, and the expansion coefficient of the molded resin is not taken into consideration, and the connection terminal is soldered to the circuit board by a thermal cycle. As is clear from the fact that stress is applied to the portion, it is not assumed that the solder will deteriorate. Further, an S-shaped connection terminal is used for the purpose of absorbing vibration, but since the plate thickness direction of this S-shaped connection terminal coincides with the plate thickness direction of the circuit board, the plane of the circuit board. The arrangement area of the connection terminals in the direction along the above becomes large, which causes a problem from the viewpoint of space saving.

In the above Patent Document 4, in order to improve heat dissipation, it is described that a slit is provided in the extension portion of the connection terminal to increase the area in contact with the atmosphere. However, the coefficient of linear expansion of the connection terminal and the circuit board It does not take into consideration the relationship between the expansion coefficient and the expansion coefficient of the molded resin, and as is clear from the fact that stress is applied to the portion where the connection terminals are soldered to the circuit board by the thermal cycle, soldering is performed. Is not supposed to deteriorate, and the stress applied to the soldered portion cannot be reduced.

Therefore, the subject of the present invention is that it is possible to reduce the stress in all directions applied to the portion where the connection terminal is soldered to the circuit board by the thermal cycle, and it is easy to manufacture, compact, and in the height direction. The purpose is to provide a connection terminal that is small in size and takes heat dissipation into consideration.

Another object of the present invention is to make a portion where the connection terminal is soldered to the circuit board by a thermal cycle in consideration of the relationship between the linear expansion coefficient of the connection terminal, the expansion coefficient of the circuit board, and the expansion coefficient of the molded resin. It is an object of the present invention to provide a connection terminal capable of reducing the stress in all such directions.

Still another object of the present invention is to provide a motor device having such a connection terminal.

Still another object of the present invention is to provide a wiper motor device that uses a motor device having such a connection terminal to drive the wiper device.

The above object of the present invention can be achieved by the following configuration. That is, the connection terminal of the first aspect of the present invention has a substrate connection portion electrically connected to the substrate, one end connected to the substrate connection portion, and the other end extending to the opposite side to the substrate connection portion. The same plate material includes an intermediate portion connected to one end of the joint portion and a base portion connected to the other end of the joint portion and separated from the intermediate portion via a slit in a portion other than the joint portion. A connection terminal having a substrate-side terminal formed on substantially the same plane, the longitudinal direction of the substrate connection portion intersects the plane of the substrate, and the connection terminal is the same as the substrate-side terminal. The substrate-side connecting portion further has a substrate-side connecting portion formed of the above-mentioned plate material, and the substrate-side connecting portion has a shape in which the length along the longitudinal direction of the connection terminal is larger than the length in the width direction, and the base portion is the said. It is connected to one end in the width direction of the substrate-side connecting portion, and the base portion is bent toward the substrate side along one end portion in the width direction of the substrate-side connecting portion in the base portion. It is characterized in that the bent length is larger than the length along the direction of being raised from the substrate-side connecting portion toward the substrate connecting portion .

The connection terminal of the second aspect of the present invention is the connection terminal of the first aspect, characterized in that the plate thickness direction of the substrate side terminal intersects with the plate thickness direction of the substrate.

The connection terminal of the third aspect of the present invention is the connection terminal of the first or second aspect, in which a recess communicating with the slit is provided in the vicinity of the connection portion between the intermediate portion and the joint portion. It is characterized by.

The connection terminal according to the fourth aspect of the present invention is the connection terminal according to any one of the first to third aspects, and the substrate connection portion is further provided with a bent portion.

The connection terminal according to the fifth aspect of the present invention is the connection terminal according to any one of the first to fourth aspects, wherein the substrate-side terminal is provided with a heat dissipation promoting portion.

The connection terminal according to the sixth aspect of the present invention is the connection terminal according to any one of the first to fifth aspects, wherein a part or all of the substrate-side connecting portion is embedded in the molding resin.

The connection terminal according to the seventh aspect of the present invention is the connection terminal according to any one of the first to sixth aspects, wherein a part of the base portion is embedded in a molding resin.

The connection terminal according to the eighth aspect of the present invention is the connection terminal according to any one of the first to seventh aspects, wherein a part of the connection terminal is embedded in a molding resin.

The connection terminal according to the ninth aspect of the present invention is the connection terminal according to any one of the sixth to eighth aspects, wherein a part of the connection terminal is embedded in a molding resin.

The connection terminal according to the tenth aspect of the present invention is the connection terminal according to any one of the first to ninth aspects, wherein the connection terminal is made of the same plate material as the substrate side terminal and the substrate side. It is characterized by further providing a terminal different from the terminal.

The motor device of the eleventh aspect of the present invention is provided with the connection terminal of the tenth aspect, and is provided with a motor to be fed from the other terminal.

The wiper motor device according to the twelfth aspect of the present invention is characterized in that the motor device according to the eleventh aspect is for driving the wiper device.

According to the connection terminal of the first aspect of the present invention, the substrate connection portion soldered to the substrate is supported by the intermediate member and the coupling portion, so that the plate thickness direction of the substrate side terminal and the plate thickness direction thereof. It can be bent in the direction orthogonal to and in the plate thickness direction of the circuit board. As a result, when stress is generated at the part where the board connection part to the circuit board is soldered due to the thermal cycle, the board connection part can be displaced in each direction, so that the stress applied to the soldered part is absorbed. It is possible to suppress deterioration such as cracks in the solder. Further, the connection terminal can be easily manufactured by pressing a plate material, is compact and has a small size in the height direction, and can be enhanced in heat dissipation by a slit or the like.

Further, according to the connection terminal of the first aspect of the present invention, the board connection portion is soldered, for example, perpendicular to the plane of the circuit board, so that the board connection portion to the circuit board is soldered by a thermal cycle. The board-side terminal can appropriately absorb the stress at the site where the soldering is performed.
Further, according to the connection terminal of the first aspect of the present invention, the base portion is bent from the substrate side connection portion to the circuit board side, so that the posture of the substrate side terminal can be appropriately maintained.

According to the connection terminal of the second aspect of the present invention, for example, by setting the plate thickness direction of the substrate side terminal to be a direction orthogonal to the plate thickness direction of the circuit board, the substrate connection portion to the circuit board is soldered by a thermal cycle. The board-side terminal can appropriately absorb the stress at the attached portion.

According to the connection terminal of the third aspect of the present invention, by providing a recess communicating with the slit between the intermediate portion and the coupling portion, the substrate side terminal is bent and the substrate connection portion is in the plate thickness direction of the circuit board. The amount of displacement can be increased.

According to the connection terminal of the fourth aspect of the present invention, since the substrate connection portion further includes a bent portion, the substrate side terminal becomes more easily bent, so that the substrate connection portion to the circuit board is soldered by a thermal cycle. The board-side terminal can more reliably absorb the stress at the site.

According to the connection terminal of the fifth aspect of the present invention, since the substrate side terminal is provided with a heat dissipation promoting portion having appropriate irregularities in addition to the slit, the area in contact with the atmosphere can be increased. It can improve heat dissipation.

According to the connection terminal of the sixth aspect of the present invention, since the expansion coefficient of the molded resin is taken into consideration in addition to the linear expansion coefficient of the connection terminal and the expansion coefficient of the circuit board, the substrate can be connected to the circuit board by a thermal cycle. The board-side terminal can appropriately absorb the stress at the portion where the portion is soldered.

According to the connection terminal of the seventh aspect of the present invention, the amount of the substrate-side terminal embedded in the molding resin can be appropriately set.

According to the connection terminals according to the eighth and ninth aspects of the present invention, the connection terminals can be integrally formed with the cover by insert molding, so that assembly is easy and the assembly man-hours can be reduced.

According to the connection terminal of the tenth aspect of the present invention, another terminal, for example, a motor-side terminal can be easily manufactured by pressing the same plate material together with the substrate-side terminal.

According to the motor device of the eleventh aspect of the present invention, it is possible to provide a motor device having the effect of the connection terminal.

According to the wiper motor device according to the twelfth aspect of the present invention, it is possible to provide a wiper motor device having the effect of the connection terminal.

It is external perspective view of the motor apparatus to which the connection terminal which concerns on Embodiment 1 of this invention is applied. It is an exploded perspective view of FIG. It is an exploded perspective view of the opening side of a cover drawn by taking out an insert part from a molding resin of a cover. It is a perspective view of the opening side of the cover in a state where the insert component of FIG. 3 is integrated by insert molding. It is a perspective view of a circuit board. It is a front perspective view of a connection terminal. It is a rear perspective view of a connection terminal. 8A is a rear view of the connecting member, FIG. 8B is a top view of the connecting member, and FIG. 8C is a front view of the connecting member. It is a partial perspective view which showed the connection state of the connection terminal to a circuit board. It is a circuit diagram of the H bridge part using four FETs. It is an enlarged front view of the substrate side terminal of Embodiment 2. It is an enlarged front view of the substrate side terminal of Embodiment 3.

[Embodiment 1]
Hereinafter, an example in which the connection terminal according to the first embodiment of the present invention is applied to the wiper motor device will be described with reference to the drawings. However, the embodiments shown below exemplify connection terminals for embodying the technical idea of the present invention, and do not specify the present invention to these, and other embodiments included in the claims. It is equally applicable to the form.

A case where the connection terminal 46 according to the first embodiment of the present invention is applied to the motor device 1 used for driving the wiper device will be described with reference to FIGS. 1 to 9 as an example.

First, a schematic configuration of the motor device 1 according to the embodiment of the present invention will be described with reference to FIGS. 1 and 2. 1 is an external perspective view of the motor device 1 to which the connection terminal 46 according to the first embodiment of the present invention is applied, and FIG. 2 is an exploded perspective view of FIG. 1.

The motor device 1 is used as a drive source for the wiper device 4 of the vehicle. The motor device 1 is between the motor main body 10 which is controlled so as to be capable of forward and reverse rotation, the deceleration mechanism portion 20 which is connected to the motor main body 10 and is housed in the housing 21, and covers the opening side of the housing 21. It is composed of a cover 30 that constitutes a closed space, a control device 60 that is arranged in the closed space, and a separator 32 that divides the closed space into a speed reduction mechanism unit 20 side and a control device 60 side.

The output shaft 27 projects from the non-opening side (lower side of FIG. 1) of the housing 21 of the speed reduction mechanism portion 20. The output shaft 27 is directly or indirectly connected to a wiper arm to which a wiper blade for wiping the window glass of the vehicle is attached to the tip thereof. In the wiper device 4, the output shaft 27 is driven by the motor body 10 so as to be able to rotate forward and reverse, and the wiper arm is oscillated, so that the wiper blade wipes back and forth between the upside-down position and the downside-down position of the window glass surface. It is configured to be.

Although the motor device 1 will be described as a drive source for the wiper device 4 of the vehicle in the first embodiment, the application of the motor device 1 of the present invention is not limited to the drive source of the wiper device 4, and is widely used for general devices. It can be used as a drive source, and can also be applied to applications such as power seats, sliding doors, power windows, and sunroofs mounted on vehicles.

The motor body 10 is composed of a brushed motor as a DC motor. The motor body 10 includes a stator including a stator yoke 11 and a rotor (not shown) that is concentric with the stator and rotatably supported inside the stator. The stator includes a stator yoke 11 as a housing of the motor body 10, and the stator yoke 11 is made of a magnetic material such as iron and is formed in a substantially bottomed cylindrical shape. A four-pole permanent magnet (not shown) is provided so that the north and south poles are alternately arranged in the circumferential direction. A round bar-shaped rotating shaft is provided coaxially with the stator yoke 11 at the center of the rotor in the axial direction. A bearing is provided on the non-opening side (bottom side) of the stator yoke 11, and one end of the rotating shaft is rotatably supported. A worm 23, which will be described later, is provided at the other end of the rotating shaft. A flange 12 is provided on the opening side of the stator yoke 11 so as to project outward in the direction orthogonal to the axis of the rotation axis from the opening end of the stator yoke 11, and the flange 12 is fixed to the housing 21 by a screw or the like. There is.

The rotor is provided with an armature core so as to face the inner peripheral surface of the permanent magnet, and the armature core has a multi-pole magnetic pole around which a coil is wound, and each magnetic pole faces the permanent magnet. is doing. Further, a commutator conducting the coil is provided on the opening side of the stator yoke 11 of the rotor, and a plurality of brushes supported by the brush holder 41, which will be described later, are in sliding contact with each other to energize the coil. ing.

In the first embodiment, the motor body 1 is described as a motor with a brush as a DC motor, but the type of the motor of the motor body 1 of the present invention is not limited to this, and for example, a brushless motor or the like. It can also be applied to various types of motors.

The housing 21 has a bottomed box shape in which the deceleration mechanism portion 20 is housed on the opening side and the brush holder 41 is housed in the brush holder housing portion 44 integrally formed on the motor body side, and the material is conductive. It is a material such as a sex metal, for example, aluminum or an aluminum alloy, and is formed by, for example, die casting. Further, the housing 21 has an output shaft hole (not shown) through which the output shaft 27 is inserted and supported from the side opposite to the opening side, a rotary shaft insertion hole 38 through which the rotary shaft is inserted by communicating with the motor main body side, and It has a brush holder insertion hole 43 through which the power supply terminal 42 of the brush holder 41 is inserted. The material of the housing 21 is not limited to aluminum, and any material may be used as long as it is a conductive metal. The bottomed box-shaped side wall rises to a height substantially equal to the height of the flange 12 on the motor body 1 side, and a concave brush holder accommodating portion 44 for accommodating the brush holder 41 is provided on the motor body 1 side of this side wall. It is provided. A brush holder insertion hole 43 through which the power supply terminal 42 portion is inserted is provided on the side wall at a position corresponding to the power supply terminal 42 of the brush holder 41. The power feeding terminal 42 is configured as a female plug, and a male plug 94 of the motor side terminal 49 of the connection terminal 46 described later is inserted.

Further, on the opening side of the housing 21, a mounting portion 29 on which the circuit board 61 is mounted and a female screw 22 are provided on the peripheral edge portion. Here, the circuit board 61 as the "board" is, for example, a glass resin substrate, and is formed in a substantially rectangular plate shape with the axial direction of the output shaft 27 as the thickness direction, and a part of the control device 60 is formed. It is composed. As will be described later, the circuit board 61 has a power element such as a field effect transistor (hereinafter referred to as FET) mounted on the front surface 62, and a microcomputer 64 or a magnetic sensor 65 (see FIG. 4) on the back surface 63. A control element is mounted, and the back surface 63 is arranged so as to face the mounting portion 29. Further, as will be described later, the circuit board 61 is fixed to the cover 30. Since the mounting portion 29 is provided so as to face the power element such as the FET, the heat generated by the power element such as the FET can be conducted to the housing 21 and dissipated. The circuit board 61 is provided with a conductive pattern portion (not shown).

Inside the side wall of the housing 21 on the motor body 1 side, a pair of groove portions 25 that engage and contact the pair of first grounding portions 53 of the shield member 50 are provided so as to straddle the feeding terminal 42. Further, an inclined surface 26 is provided on each of the feeding terminal sides of the pair of groove portions 25, and the inclined surface 26 is in contact with the first grounding portion 53 of the shield member 50, which will be described later.

Further, a worm accommodating portion and a worm wheel accommodating portion 39 are provided on the opening side of the housing 21, and the worm 23 and the worm wheel 24 provided at the other end of the rotation shaft of the motor body 10 are accommodated, respectively. The other end of the rotating shaft of the motor body 10 is provided with a worm 23 at the tip penetrating the rotating shaft insertion hole 38 of the housing 21, and the tip of the worm 23 is pivotally supported by a bearing provided in the housing 21. There is. Since the worm 23 meshes with the worm wheel 24, the rotation of the rotation shaft of the motor body 1 is worm-decelerated by the action of the worm 23 and the worm wheel 24, and is output from the output shaft 27.

A sensor magnet 28 is provided on the non-output side end surface of the output shaft 27, which is the central portion of the housing 21 of the worm wheel 24 on the open side, in order to detect the absolute rotation angle of the output shaft 27 by the magnetic sensor 65 described later. It is attached by a fixing plate 40 made of a magnetic material such as stainless steel. The sensor magnet 28 has a disk-like shape and is mounted concentrically with the output shaft 27. For example, when viewed from the axial direction of the output shaft 27, one semicircle is attached to the N pole and the other semicircle is attached to the S pole. It is magnetized. Further, a predetermined gap is provided between the sensor magnet 28 and the circuit board 61.

The cover 30 has a bottomed box shape and is formed by injection molding or the like from, for example, an insulating resin material. As described later, the external connection terminal 45, the connection terminal 46, and the shield member 50 are integrally attached to the cover 30. A screw hole 37 is provided at the peripheral edge portion. By covering the opening side of the housing 21 with the opening side of the cover 30, a closed space is formed between the two. The separator 32 divides the closed space formed by the housing 21 and the cover 30 into the speed reduction mechanism portion 20 side and the control device 60 side, and is formed by, for example, injection molding with a resin material. The separator 32 includes a sensor magnet opening 34 for allowing the sensor magnet 28 to face the magnetic sensor 65 on the circuit board 61, a power supply terminal insertion hole 35 for inserting the power supply terminal 42 portion of the brush holder 41, and a circuit board 61. A mounting portion accommodating hole 36 for accommodating the mounting portion 29 to be mounted is provided on the circuit board 61 side in an exposed state.

To assemble the motor device 1, first, the separator 32 is assembled on the opening side of the housing 21 to which the motor body 10, the worm 23, the worm wheel 24, and the like are attached. Specifically, the separator 32 is placed on the opening side of the housing 21 so that the positioning convex portion 33 of the separator is inserted into the positioning recess 70 of the housing 21, so that the sensor magnet 28 faces the opening hole 34 for the sensor magnet. No, the power feeding terminal 42 is inserted into the feeding terminal insertion hole 35, and the mounting portion 29 is accommodated in the mounting portion accommodating hole 36. Next, as will be described later, the cover 30 to which the circuit board 61 is previously attached to the opening side is housed so as to sandwich the separator 32 and the screw hole 37 of the cover 30 to match the female screw 22 of the housing 21. It overlaps with 21 and finally, the male screw 31 is inserted from the screw hole 37 of the cover 30 and screwed into the female screw 22 of the housing 21. When the cover 30 is stacked on the housing 21, the first ground contact portion 53 of the shield member 50 integrally attached to the cover 30 comes into contact with the inclined surface 26 of the groove portion 25 and also functions as a positioning guide.

<Structure of cover 30>
Next, the configuration of the cover 30 will be described with reference to FIGS. 3 and 4. The external connection terminal 45, the connection terminal 46, and the shield member 50 are integrally attached to the cover 30 by insert molding. 3 is an exploded perspective view of the opening side of the cover 30 drawn by taking out the insert component from the molding resin of the cover 30 for explanation, and FIG. 4 is a state in which the insert component of FIG. 3 is integrated by insert molding. It is a perspective view of the opening side of the cover 30.

The cover 30 is formed by, for example, injection molding with an insulating resin material, and has a substantially box shape having a peripheral wall rising from the periphery of the bottom surface toward the opening side. An external connection terminal 45 is arranged inside on the outer side of the peripheral wall of the cover 30 on the side substantially opposite to the motor main body 10 side, and a connector portion 47 to which an external connector (not shown) is connected is formed.
Next, the insert component will be described in detail.

The external connection terminal 45 is formed by press-molding a conductive metal plate, for example, a copper plate, and has an external one end for inputting / outputting electric signals such as a vehicle speed sensor and a raindrop sensor and supplying power. A plurality of terminals 45B connected to a connector (not shown) are provided, and a plurality of terminals 45A soldered to the circuit board 61 are provided at the other end.

The connection terminal 46 is formed by press-molding a conductive metal plate, for example, a copper plate, and has a motor-side terminal 49 connected to a power supply terminal 42 of the brush holder 41 at one end thereof, as described later. A board-side terminal 48 to be soldered to the circuit board 61 is provided at the other end. Further, the connection terminals 46 are arranged so that the pair are parallel to each other in the same direction at predetermined intervals and the longitudinal direction is substantially parallel to the axis of the rotation axis of the motor body 10. The terminal 48 and the motor-side terminal 49 are insert-molded integrally with the cover 30 in such a posture that the terminal 48 and the motor-side terminal 49 face the opening side (upper side of FIG. 3) of the cover 30. As will be described later, a part of the substrate side terminal 48 and the motor side terminal 49 is exposed from the molding resin.

The shield member 50 is formed by press-molding a conductive metal plate, for example, a copper plate, and is a member for shielding electromagnetic noise emitted from a feeding terminal 42 or a FET which is a switching element. The shield member 50 has a substantially L-shaped first flat surface portion 51 facing the power feeding terminal 42 and the first flat surface portion 51 having a step near the opening side of the cover 30, and is a power element such as an FET. The substantially rectangular second flat surface portion 52 facing the surface is formed of the same conductive metal plate. The combined shape of the first flat surface portion 51 and the second flat surface portion 52 is substantially rectangular when viewed from the opening side of the cover 30.

A pair of first ground contact portions 53 are bent and raised toward the opening side of the cover 30 from the end portion of the protrusion portion of the first flat surface portion 51 toward the motor body 10, and the first one is provided. A pair of capacitor terminals 54 are bent toward the opening side of the cover 30 from the vicinity of the grounding portion 53 and the vicinity of the motor side terminal 49 connected to the power supply terminal 42 of the brush holder 41 of the connection terminal 46. It is set up. The pair of first grounding portions 53 are engaged in contact with the groove portions 25 provided in the housing 21, and are grounded by being conducted to the housing 21 via the inclined surface 26. The housing 21 is body grounded to the vehicle.

At the end of the first flat surface portion 51 opposite to the first grounding portion 53, in the vicinity of the external connection terminal 45, a second grounding portion 57 is provided on the opening side of the cover 30 with the plate surface bent stepwise. The board grounding portion 56 connected to the Z-shaped terminal 76 provided on the circuit board 61 described later in the first step of the staircase is the housing 21 in the second step of the staircase. A housing grounding portion 55 connected to a male screw 31 to be screwed into is provided. The second grounding portion 57 is grounded by being conducted by the substrate grounding portion 56 to the ground pattern of the circuit board 61 via the Z-shaped terminal provided on the circuit board 61, and is grounded by the housing grounding portion 55. It is grounded by being conducted to the housing 21 via a conductive male screw 31.

As shown in FIG. 4, the external connection terminal 45, the connection terminal 46, and the shield member 50 are insert-molded together with the cover 30, so that a part of the external connection terminal 45, the connection terminal 46, and the shield member 50 project from the molding resin toward the opening side of the cover 30. It is integrally attached to the cover 30. That is, the terminal 45A soldered to the circuit board 61 provided at the other end of the external connection terminal 45, and the motor side terminal connected to the power supply terminal 42 of the brush holder 41 provided at one end of the connection terminal 46. 49, the board side terminal 48 soldered to the circuit board 61 provided at the other end of the connection terminal 46, the pair of first grounding members 53 of the shield member 50, and the pair of capacitor terminals 54 are covered 30. It is provided so as to project from the molding resin of the above so that it can be bent toward the opening side and started up. Of the second grounding portion of the shield member 50, the substrate grounding portion 56 is exposed from the molding resin of the cover 30, and the housing grounding portion 55 is provided so as to be exposed to the screw hole 37 of the cover 30. Further, the plurality of terminals 45B connected to the external connector provided at one end of the external connection terminal 45 are provided in the connector portion 47 so as to protrude from the molding resin of the cover 30. Here, the shield member 50 and the connection terminal 46 are separated from each other at a predetermined interval, and are insulated from each other by a molding resin.

In the first embodiment, an example in which the shield member 50, the external connection terminal 45, and the connection terminal 46 are insert-molded together with the cover 30 has been described, but the present invention is not limited thereto. For example, the shield member 50, the external connection terminal 45, and a part or all of the connection terminal 46 are covered by a method other than insert molding, for example, press-fitting, snap coupling, uneven fitting, screwing, adhesion, heat welding, heat caulking, and the like. It may be fixed to 30. Further, a part or all of the shield member 50, the external connection terminal 45 and the connection terminal 46 may be separated from the cover 30. In this case, whether or not a part or all of the shield member 50, the external connection terminal 45, and the connection terminal 46 is integrated with the cover 30 may be appropriately determined in consideration of the assembly man-hours.

The circuit board 61 is fixed to the opening side of the cover 30. On the opening side of the cover 30, a heat caulking protrusion 68 and a fixing protrusion 69 are provided so as to project toward the circuit board 61. On the other hand, the outer peripheral portion of the circuit board 61 is provided with a heat caulking protrusion insertion hole 66 through which the heat caulking protrusion 68 is inserted and a fixed protrusion insertion hole 67 through which the fixed protrusion 69 is inserted. The heat caulking protrusion 68 and the fixing protrusion 69 are formed so as to have a large diameter on the non-open side of the cover 30 and a small diameter on the open side of the cover 30. The inner diameter of the heat caulking protrusion insertion hole 66 is set to be slightly larger than the small diameter portion of the heat caulking protrusion 68, and the inner diameter dimension of the fixed protrusion insertion hole 67 is set to be slightly larger than the small diameter portion of the fixed protrusion 69. Therefore, when the heat caulking protrusion 68 and the fixing protrusion 69 projecting from the opening side of the cover 30 are inserted into the heat caulking protrusion insertion hole 66 and the fixing protrusion insertion hole 67 provided in the circuit board 61, respectively, the circuit board The circuit board 61 is positioned with respect to the bottom surface of the cover 30 by the surface 62 of the circuit board 61 coming into contact with the end faces of the large diameter portions of the heat caulking protrusion 68 and the fixed protrusion 69. Then, in this state, the circuit board 61 is fixed in a state of being positioned on the opening side of the cover 30 by heat caulking the heat caulking protrusion.

In the first embodiment, an example of using heat caulking as a means for fixing the circuit board 61 to the cover 30 has been described, but the means for fixing the circuit board 61 to the cover 30 of the present invention is not limited to heat caulking. However, any fixing means such as press-fitting, snap coupling, uneven fitting, screwing, bonding, etc. may be used.

<Structure of circuit board 61>
Next, a specific configuration of the circuit board 61 of the motor device 1 according to the first embodiment of the present invention will be described with reference to FIG. Note that FIG. 5 is a perspective view of the surface side of the circuit board 61.

A microcomputer 64 and a magnetic sensor 65 are mounted on the back surface 63 of the circuit board 61, and these form a wiper control circuit (see FIG. 4). The wiper control circuit controls the wiper drive circuit unit 71, which will be described later, for driving the motor body 10 connected to the wiper blade 3 via the reduction mechanism unit 20 and the like in the forward and reverse directions. As the magnetic sensor 65, any magnetic detection element such as a Hall IC, a magnetoresistive element, a Hall element, or an MR sensor may be used. The magnetic sensor 65 is provided so as to face the sensor magnet 28 attached to the non-output side end surface of the output shaft 27 in the worm wheel 24. By detecting changes in the direction and strength of the magnetic flux of the sensor magnet 28 with the magnetic sensor 65 and calculating the rotation angle of the sensor magnet 28, the absolute angular position of the output shaft 27, that is, the position and the moving direction of the wiper blade 3 can be determined. To detect. In the wiper control circuit, the forward / reverse control of the motor body 10 is performed based on the signal at the absolute angle position of the output shaft 27.

As shown in FIG. 5, a plurality of circuit elements constituting the wiper drive circuit unit 71 are mounted on the surface 62 of the circuit board 61. In the wiper drive circuit unit 71, a circuit including four FETs 73 constituting the H bridge drives the motor body 10 as described later. The circuit board 61 is provided with a pump drive circuit unit that drives the washer pump (not shown) of the washer device that supplies the cleaning liquid to the window glass of the vehicle according to the position and the moving direction of the wiper blade 3. May be.

Further, the surface 62 of the circuit board 61 is provided with a Z-shaped terminal 76 that is electrically conductive to the ground pattern of the circuit board 61 and has elasticity, and the Z-shaped terminal 76 is the second grounding portion of the shield member 50. It is electrically connected to the board grounding portion 56 of 57. Soldering is not required for joining the board grounding portion 56 and the Z-shaped terminal 76 by using the elasticity of the Z-shaped terminal 76 (elasticity in the direction in which the circuit board 61 and the cover 30 are assembled). The housing grounding portion 55 of the second grounding portion is provided with a screw hole, and when the screw hole 37 of the cover 30 is screwed into the female screw 22 of the housing 21 with the male screw 31, the male screw 31 The housing grounding portion 55 is fastened together. That is, in the second grounding portion 57 of the shield member 50, the board grounding portion 56 is grounded to the circuit board 61 via the Z-shaped terminal 76, and the housing grounding portion 55 is co-tightened to the housing 21 by the male screw 31. It is grounded, and it is not necessary to solder the board grounding portion 56 to the Z-shaped terminal 76 and the housing grounding portion 55 to the housing 21.

The circuit board 61 is provided with an external connection terminal insertion hole 58 and a connection terminal insertion hole 59. The terminal 45A of the external connection terminal 45 is inserted into the external connection terminal insertion hole 58 from the front surface 62 of the circuit board 61, and is fixed by soldering on the back surface 63, and the external connection terminal 45 is fixed to the wiring pattern of the circuit board 61. On the other hand, it is electrically connected. The pair of connection terminal insertion holes 59 are provided in the vicinity of the four FETs 73 constituting the H bridge, and the pair of connection terminal insertion holes 59 are connected to the board of the board side terminals 48 of the pair of connection terminals 46 described later. With the portion 81 inserted from the front surface 62 of the circuit board 61, it is fixed by soldering on the back surface 63, and the pair of connection terminals 46 are electrically connected to the wiring pattern of the circuit board 61, respectively.

<Structure of connection terminal>
Next, a specific configuration of the connection terminal 46 will be described with reference to FIGS. 6 to 9. 6 is a front perspective view of the connection terminal, FIG. 7 is a rear perspective view of the connection terminal, FIG. 8A is a rear view of the connection member, FIG. 8B is a top view of the connection member, and FIG. 8C is a front view of the connection member. , FIG. 9 is a partial perspective view showing the connection state of the connection terminal to the circuit board. The connection terminals 46 are arranged so that the pair are parallel to each other in the same direction at predetermined intervals and the longitudinal direction is substantially parallel to the axis of the rotation axis of the motor body 10. Reference numeral 8 indicates one connection terminal.

The connection terminal 46 is formed by press-molding a single conductive metal plate, for example, a copper plate, and has a substrate side terminal 48, a substrate side connecting portion 91, a step portion 93, a motor side connecting portion 92, and the like. All the motor side terminals 49 are integrally formed. The board-side connecting portion 91 and the motor-side connecting portion 92 have a substantially elongated rectangular shape, and the plate thickness direction coincides with the plate thickness direction of the circuit board 61. One end of the board-side connecting portion 91 in the longitudinal direction is bent substantially vertically in a direction away from the circuit board 61, and is connected to one end of the step portion 93. The other end of the step portion 93 is bent substantially vertically in the direction opposite to the substrate side connecting portion 91, and is connected to one end of the motor side connecting portion 92. The substrate-side connecting portion 91, the step portion 93, and the motor-side connecting portion 92 are formed so as to be long and thin in a straight line when viewed from above (see FIG. 8B).

From one side surface (output shaft 27 side) on the other end side of the motor side connecting portion 92, the motor side terminal 49 stands up by being bent substantially vertically toward the circuit board 61 at the motor side bent portion 96. It is set up. The motor-side terminal 49 projects further toward the motor body 10 than the other end of the motor-side connecting portion 92, and has a substantially rectangular male plug 94 on the motor body 10 side. Further, the motor side terminal 49 is a notched groove-shaped connection terminal side capacitor terminal on the board side connecting portion 91 side of the male plug 94 and on the motor side connecting portion 92 side at a portion lower in height than the male plug 94. Has 95. The motor-side terminal 49 is formed on the same plane substantially perpendicular to the surface 62 of the circuit board 61, including the portion having the male plug 94 and the connection terminal-side capacitor terminal 95. When the cover 30 is assembled to the housing 21, the male plug 94 is inserted into the female plug of the feeding terminal 42 provided in the brush holder 41. Further, a capacitor is connected between the capacitor terminal 95 on the connection terminal side and the capacitor terminal 54 of the shield member 50. That is, of the pair of terminals provided on the capacitor, one terminal is connected to the connection terminal side capacitor terminal 95, and the other terminal is connected to the capacitor terminal 54 of the shield member 50.

On the other side surface (opposite side of the output shaft 27) of the board-side connecting portion 91 opposite to the motor body 10, the board-side terminal 48 is bent substantially perpendicular to the circuit board 61 side at the board-side bent portion 85. It is erected. The plate thickness direction of the substrate side terminal 48 is substantially orthogonal to the plate thickness direction of the circuit board 61.

An elongated prismatic substrate connecting portion 81 is provided on the side opposite to the substrate side bent portion 85 of the substrate side terminal 48 in a posture in which the length direction thereof is substantially perpendicular to the surface 62 of the circuit board 61. One end of the board connection portion 81 is fixed by soldering on the back surface 63 with the connection terminal insertion hole 59 of the circuit board 61 inserted from the front surface 62, and the connection terminal 46 is electrically connected to the wiring pattern of the circuit board 61. Is connected.

One end of the intermediate portion 82 is connected to the other end of the board connecting portion 81 on the opposite side of the motor main body 10. The intermediate portion 82 has an elongated rectangular shape, and its length direction is substantially parallel to the substrate side bent portion 85. An intermediate portion recess 87 is provided in the vicinity of the connecting portion of the intermediate portion 82 with the board connecting portion 81 on the circuit board 61 side. One end of the coupling portion 83 is connected to the other end of the intermediate portion 82 on the opposite side of the circuit board 61. Further, the circuit board 61 side of the elongated rectangular base portion 84 opposite to the motor main body 10 is connected to the other end of the coupling portion 83. The long side of the base portion 84 is substantially parallel to the longitudinal direction of the substrate side bent portion 85 and the intermediate portion 82, and the long side of the intermediate portion 82 on the substrate side bent portion 85 side and the length of the base portion 84 on the circuit board 10 side. An elongated linear slit 86 that communicates with the side from the motor main body 10 side except for the portion of the coupling portion 83 and whose longitudinal direction is substantially parallel to the substrate side bent portion 85 is provided.

The long side of the base 84 opposite to the circuit board 61 is connected to the board-side bent portion 85. That is, the base portion 84 stands on the other side surface (opposite side of the output shaft 27) of the board side connecting portion 91 on the side opposite to the motor body 10 by bending substantially perpendicular to the circuit board 61 side at the board side bent portion 85. It is set up. The length of the long side of the base portion 84 on the substrate side bent portion 85 side is set shorter than the length of the substrate side connecting portion 91 in the longitudinal direction. Further, the long side of the base portion 84 on the substrate side bent portion 85 side is connected to the substrate side connecting portion 91 as a whole. The above description of the connection between the base portion 84 and the substrate-side connecting portion 91 is merely an example, and the present invention includes various connection modes. For example, similarly to the motor side terminal 49, the board side terminal 48 may be formed so as to project from the board side connecting portion 91 to the side opposite to the motor main body 10. Further, the substrate side bent portion 85 may have a notch from the motor main body 10 side, the opposite side of the motor main body 10, or both, and the substrate side bent portion 85 may have a notch. , May have intermittent slits.

The substrate side terminal 48 including the substrate connection portion 81, the intermediate portion 82, the coupling portion 83, and the base portion 84 is formed on the same plane substantially perpendicular to the surface 62 of the circuit board 61, and is viewed from the circuit board 61 side. , The substrate side terminal 48 is substantially linear (see FIG. 8B). Further, regarding the height direction from the substrate side connecting portion 91, the base portion 84, the slit 86, and the intermediate portion 82 are all substantially parallel to the substrate side bent portion 85, and the longitudinal direction thereof is parallel to the substrate side bent portion 85. Since it has an elongated shape that is oriented in such a direction, the size from the substrate side bent portion 85 to the intermediate portion 82 is also compact.

In the board-side terminal 48 having such a structure, when stress is generated at the tip of the board connection portion 81 soldered to the circuit board 61, each part of the board-side terminal 48 bends and deforms according to the stress. The stress generated at the tip of the board connection portion 81 in all directions can be significantly reduced. First, the substrate-side terminal 48 can be flexed and deformed in the plate thickness direction. Next, since the intermediate portion recess 87 is provided in the vicinity of the connection portion of the intermediate portion 82 with the board connection portion 81 on the circuit board 61 side, the substrate side terminal 48 bends and deforms in the vicinity of the intermediate portion recess 87. It is possible. That is, the presence of the intermediate portion recess 87 allows the substrate side terminal 48 to bend and deform so that the substrate connecting portion 81 is displaced with respect to the intermediate portion 82 in the longitudinal direction of the intermediate portion 82. Further, a slit 86 is provided between the intermediate portion 82 and the base portion 84, and the intermediate portion 82 has an elongated rectangular shape. Therefore, by adjusting the dimensions of each portion, the substrate connecting portion 81 becomes the circuit board 61. It is permissible for each part of the substrate-side terminal 48 to bend and deform so as to be displaced in the plate thickness direction.

The connection terminal 46 is formed by press-molding a single conductive metal plate, for example, a copper plate, and has a substrate side terminal 48, a substrate side connecting portion 91, a step portion 93, a motor side connecting portion 92, and the like. All the motor side terminals 49 are integrally formed.

Further, the substrate side terminal 48 is provided with a plurality of uneven portions such as slits 86 and intermediate recesses 87, and these uneven portions act as "heat dissipation promoting portions".

In FIG. 9, the molding resin and the shield member 50 are omitted, and only the circuit board 61 and the pair of connection terminals 46 are drawn. Actually, a part or all of the substrate side connecting portion 91, the motor side connecting portion 92, and the step portion 93 of the connection terminal 46 are embedded in the molding resin, and the substrate side bent portion 85 side of the base portion 84 and the motor. The motor side bent portion 96 side of the side terminal 49 is embedded in the molding resin up to a predetermined portion. A part of the circuit board 61 side of the base 84 and a part of the circuit board 61 side of the motor side terminal including the male plug 94 and the connection terminal side capacitor terminal 95 are exposed from the molding resin (FIG. 4). reference).

The pair of connection terminals 46 are arranged in parallel in the same direction at predetermined intervals, and the longitudinal direction is substantially parallel to the axis of the rotation axis of the motor body 10. The plate thickness direction of 91 and the motor side connecting portion 92 substantially coincides with the plate thickness direction of the circuit board 61, and the substrate side terminal 48 and the motor side terminal 49 are from the substrate side connecting portion 91 and the motor side connecting portion 92 to the circuit board 61, respectively. It is bent substantially vertically to the side, and is arranged so that the plate thickness direction of the substrate side terminal 48 and the motor side terminal 49 is orthogonal to the plate thickness direction of the circuit board 61.

A pair of connection terminal insertion holes 59 are provided in the vicinity of the four FETs 73 constituting the H bridge of the circuit board 61, and the pair of connection terminal insertion holes 59 are provided with the board-side terminals of the pair of connection terminals 46. The board connection portion 81 of the 48 is fixed by soldering on the back surface 63 in a state of being inserted from the front surface 62, and the pair of connection terminals 46 are electrically connected to the wiring pattern of the circuit board 61, respectively.

<H-bridge configuration>
Next, the configuration of the H bridge will be described with reference to FIG. Note that FIG. 10 is a circuit diagram of an H-bridge portion using four FETs.

The four FETs 73A, 73B, 74C, and 74D form an H bridge that drives the DC motor 98 (motor body 10). The drain of the FET 73A is connected to the power supply, that is, the positive electrode of the vehicle-mounted battery, and the source is connected to the drain of the FET 73C. The source of the FET 73C is grounded. On the other hand, the drain of the FET 73B is connected to the power supply, and the source is connected to the drain of the FET 73D. The source of the FET 73D is grounded. One terminal 97 of the DC motor 98 is connected to the source of the FET 73A and the drain of the FET 73C, and the other terminal 97 of the DC motor 98 is connected to the source of the FET 73B and the drain of the FET 73D.

When the DC motor 98 is rotated in a predetermined direction, the FET 73A and the FET 73D are turned on to supply the DC motor 98 with a current in the first direction. When the DC motor 98 is rotated in the direction opposite to the predetermined direction, the FET 73B and the FET 73C are turned on to supply the DC motor 98 with a current in the second direction opposite to the first direction. Further, by adjusting the duty ratio of the FETs of each set of FETs, that is, the set of FETs 73A and 73D and the set of FETs 73B and FET73C, the DC motor 98 is pulse width modulation controlled (PWM control) to control the rotation speed. Can be controlled. By selecting the duty ratio corresponding to the target rotation speed, the DC motor 98 can be rotated at a desired speed. Control is performed so that the duty ratio is increased when the rotation speed of the DC motor 98 is increased, and the duty ratio is decreased when the rotation speed of the DC motor 98 is decreased. The rotation direction and rotation speed of the DC motor 98 can be controlled by selecting a set for turning on the four FETs 73A, 73B, 74C, and 74D and selecting the duty ratio of each set of FETs.

The pair of terminals 97 shown in FIG. 10 corresponds to the power supply terminal 42 and the connection terminal 46 of the brush holder 41 of the DC motor 98, and are connected closest to the wiring pattern of the circuit board 61. Is a board connection portion 81 of the board side terminal 48 of the connection terminal 46 which is inserted into the connection terminal insertion hole 59 and soldered to the wiring pattern of the back surface 63 of the circuit board 61. The arrangement of the connection terminal insertion hole 59 into which the board connection portion 81 is inserted and the wiring pattern of the circuit board 61 are determined so as to be electrically balanced even if the rotation direction of the DC motor 98 is switched, for example. desirable.

<Action and effect of Embodiment 1>
The wiper control circuit controls the wiper drive circuit unit 71 that drives the motor body 10 connected to the wiper blade 3 via the reduction mechanism unit 20 and the like in the forward and reverse directions, and the wiper drive circuit unit 71 constitutes an H bridge. A circuit including the four FETs 73 drives the motor body 10 in the forward and reverse directions. The rotation of the rotating shaft of the motor body 10 is decelerated by the deceleration mechanism unit 20 and output to the output shaft 27, and is attached to the wiper arm 2 and its tip which are directly or indirectly connected to the output shaft 27 via the link mechanism. The wiper blade 3 is driven to reciprocate and swing, and the wiper blade 3 wipes the window glass of the vehicle.

The output current of the wiper drive circuit unit 71 is conducted through the connection terminal 46 to the power supply terminal 42 of the brush holder 41, and is supplied to the brush supported by the brush holder 41. In the motor body 10, power is supplied from the brush to the commutator conducted to the coil of the armature of the rotor, and the rotating shaft is rotated by the attractive repulsive force between the magnetic pole of the rotor around which the coil is wound and the magnetic pole of the stator made of a permanent magnet. When the brush is in sliding contact with the commutator, electromagnetic noise is generated from the feeding terminal. However, the shield member 50 is insert-molded into the cover 30, and the shield member 50 is grounded at a plurality of places, so that the shield member 50 is used. The captured electromagnetic noise is transmitted to the ground via the grounding part.

When the wiper is used, heat is generated because a relatively large current is supplied to the motor body. Since the control device 60 is arranged in a closed space, heat tends to be trapped, and an overload current flows through the motor body during snowfall or the like, so that the control device 60 is in a high temperature state during use. On the other hand, since the control device 60 is cooled when not in use, a thermal cycle is applied to the control device 60. When a thermal cycle is applied to the connection terminal 46, the linear expansion coefficient of the connection terminal 46, the expansion coefficient of the circuit board 61, and the expansion coefficient of the molding resin are different from each other, and the molding resin is distorted. The board connection portion 81 of the board side terminal 48 of the connection terminal 46 is inserted into the connection terminal insertion hole 59 of the above, and stress is applied to the portion soldered on the back surface 63 of the circuit board 61, resulting in deterioration such as cracks in the solder. There was a risk of causing. Therefore, in the first embodiment, the stress applied to the soldered portion is significantly reduced by improving the structure of the substrate side terminal 48 of the connection terminal 46.

In the board-side terminal 48, when stress is generated at the tip of the board connection portion 81 soldered to the circuit board 61, each part of the board-side terminal 48 bends according to the stress and is generated at the tip of the board connection portion 81. Stress in all directions can be significantly reduced. First, since the substrate-side terminal 48 can be flexed and deformed in the plate thickness direction, the stress generated in the substrate connection portion 81 in the plate thickness direction can be reduced. Next, since the intermediate portion recess 87 is provided in the vicinity of the connection portion of the intermediate portion 82 with the board connection portion 81 on the circuit board 61 side, the substrate side terminal 48 is bent and deformed in the intermediate portion recess 87. , The stress generated in the substrate connection portion 81 in the direction orthogonal to the plate thickness direction can be reduced. Further, since the slit 86 is provided between the intermediate portion 82 and the base portion 84 and the intermediate portion 82 has an elongated rectangular shape, the substrate connection portion 81 can be changed to the circuit board 61 by adjusting the dimensions of each portion. Since each part of the board-side terminal 48 can be allowed to bend and deform so as to be displaced in the plate thickness direction, the stress in the plate thickness direction of the circuit board 61 generated in the board connection portion 81 can also be reduced. .. As described above, according to the connection terminal 46 of the first embodiment, the stress applied to the tip of the substrate connection portion 81 can be significantly reduced. Since the deterioration can be significantly reduced, the life of the motor device 1 can be improved.

The connection terminal 46 of the first embodiment is easy to manufacture because it is formed by press-molding a single conductive metal plate, for example, a copper plate, and also has a substrate-side terminal 48 and a substrate-side connecting portion 91. Since the step portion 93, the motor side connecting portion 92, and the motor side terminal 49 are all integrally formed, the workability of assembly can be improved. Further, by integrating the connection terminal 46 into the cover 30 by insert molding, the manufacturing process can be further simplified and the assembly man-hours can be reduced.

The substrate side terminal 48 including the substrate connection portion 81, the intermediate portion 82, the coupling portion 83, and the base portion 84 is formed on the same plane substantially perpendicular to the surface 62 of the circuit board 61, and the substrate side terminal 48 is a circuit board. Since it is linear when viewed from the 61 side (see FIG. 8B), there is an advantage that the size of the substrate side terminal 48 in the plate thickness direction is very small and the arrangement space may be small. Further, regarding the size in the height direction from the substrate side connecting portion 91, the base portion 84, the slit 86, and the intermediate portion 82 have an elongated shape such that the longitudinal direction thereof is parallel to the substrate side bent portion 85. Therefore, the dimensions from the substrate-side bent portion 85 to the intermediate portion 82 can be reduced. Therefore, the connection terminal 46 of the first embodiment has a small arrangement space and can be reduced in size in the height direction.

The connection terminal 46 of the first embodiment is provided with a plurality of uneven portions such as a slit 86 and an intermediate recess 87 as a heat dissipation promoting portion on the substrate side terminal 48, and is sealed between the housing 21 and the cover 30. The area in contact with the atmosphere in the space can be increased, and the heat dissipation effect can be improved.

The connection terminals 46 of the first embodiment are suitable for a motor device, and four are provided on the circuit board 61 by inserting the male plug 94 of the motor side terminal 49 into the female plug of the power supply terminal 42 of the brush holder 41. The output current of the H-bridge using the FET 73 can be supplied to the DC motor 98 (motor body 10). Further, since the connection terminal 46 has a small size in the height direction, it is also advantageous for reducing the thickness of the motor device. Further, the connection terminal 46 of the first embodiment is also suitable for a wiper motor device in which thermal stress is generated by a thermal cycle and a long life is required.

[Embodiment 2]
The connection terminal 46A according to the second embodiment of the present invention will be described with reference to FIG. The same reference numerals are used for the same configurations as those in the first embodiment, and detailed description thereof will be omitted.
The connection terminal 46A according to the second embodiment is different from the first embodiment in that an inner recess 88 is provided in a portion of the connection terminal 46 facing the slit 86 on the coupling portion 83 side of the intermediate portion 82 of the substrate side terminal 48. ing. The inner recess 88 communicates with the slit 86 and is provided in a portion of the intermediate portion 82 on the joint portion 83 side, a portion between the intermediate portion 82 and the joint portion 83, or both portions.

In the first embodiment, it is possible to allow each part of the board side terminal 48 to bend and deform so that the board connection part 81 is displaced in the plate thickness direction of the circuit board 61 by adjusting the dimensions of each part. In the second embodiment, the provision of the inner recess 88 makes it possible to more easily increase the amount of bending deformation of the circuit board 61 in the plate thickness direction in the portion of the intermediate portion 82 on the connecting portion 83 side. As a result, the stress applied to the portion soldered on the back surface 63 of the circuit board 61 by inserting the substrate connection portion 81 of the substrate side terminal 48 of the connection terminal 46 into the connection terminal insertion hole 59 of the circuit board 61 by the thermal cycle. Since it can be further reduced, the life of the motor device can be improved.

[Embodiment 3]
The connection terminal 46B according to the third embodiment of the present invention will be described with reference to FIG. The same reference numerals are used for the same configurations as those in the first embodiment, and detailed description thereof will be omitted.
The connection terminal 46B according to the third embodiment is different from the first embodiment in that the first bent portion 89 and the second bent portion 90 are further provided on the board connecting portion 81 of the board side terminal 48 of the connection terminal 46. .. The board connection portion 81 of the board side terminal 48 of the connection terminal 46B is bent toward the circuit board 61 side from the end portion of the intermediate portion 82 on the motor body 10 side, and then bent toward the opposite side of the motor body 10 at the first bending portion 89. After that, the second bent portion 90 is bent toward the circuit board 61, and the longitudinal direction of the tip side thereof is substantially orthogonal to the surface of the circuit board 61.

By further providing the first bent portion 89 and the second bent portion 90 in the board connecting portion 81, the board connecting portion 81 is easily bent and deformed in all directions. Therefore, the connection terminal insertion hole 59 of the circuit board 61 is easily deformed by the thermal cycle. Even if the stress applied to the portion soldered on the back surface 63 of the circuit board 61 by inserting the substrate connection portion 81 of the substrate side terminal 48 of the connection terminal 46 is small, the stress can be easily reduced. The life of the motor device can be improved.

1 ... Motor device 2 ... Wiper arm 3 ... Wiper blade 10 ... Motor body 11 ... Stator yoke 12 ... Flange 20 ... Deceleration mechanism 21 ... Housing 22 ... Female screw
23 ... Warm 24 ... Warm wheel 25 ... Groove 26 ... Inclined surface 27 ... Output shaft 28 ... Sensor magnet 29 ... Mounting part 30 ... Cover 31 ... Male screw 32 ... Separator 33 ... Positioning convex part 34 ... Sensor magnet opening 35 ... Power supply terminal insertion hole 36 ... Mounting part storage hole 37 ... Screw hole 38 ... Rotating shaft insertion hole 39 ... Worm wheel storage part 40 ... Fixed plate 41 ... Brush holder 42 ... Power supply terminal 43 ... Brush holder insertion hole 44 ... Brush holder Accommodating part 45 ... External connection terminal 46 ... Connection terminal 47 ... Connector part 48 ... Board side terminal 49 ... Motor side terminal 50 ... Shield member 51 ... First flat part 52 ... Second flat part 53 ... First grounding part 54 ... Capacitor Terminal 55 ... Housing grounding part 56 ... Board grounding part 57 ... Second grounding part 58 ... External connection terminal insertion hole 59 ... Connection terminal insertion hole 60 ... Control device 61 ... Circuit board 62 ... Front side 63 ... Back side 64 ... Microcomputer 65 ... Magnetic sensor 66 ... Thermal caulking protrusion insertion hole 67 ... Fixed protrusion insertion hole 68 ... Thermal caulking protrusion 69 ... Fixed protrusion 70 ... Positioning recess 71 ... Wiper drive circuit unit 73 ... FET 74 ... Electrolytic capacitor 76 ... Z-shaped terminal 81 ... Board connection Part 82 ... Intermediate part 83 ... Joint part 84 ... Base 85 ... Board side bent part 86 ... Slit 87 ... Intermediate part concave part 88 ... Inner concave part 89 ... First bent part 90 ... Second bent part 91 ... Board side connecting part 92 ... Motor side connecting part 93 ... Step part 94 ... Male plug 95 ... Connection terminal side capacitor terminal 96 ... Motor side bent part 97 ... Terminal 98 ... DC motor

Claims (12)

The board connection part that is electrically connected to the board,
An intermediate portion in which one end is connected to the board connection portion and the other end is connected to one end of a coupling portion extending to the opposite side of the board connection portion.
A base portion connected to the other end of the joint portion, and a portion other than the joint portion is separated from the intermediate portion via a slit.
It is a connection terminal provided with a substrate-side terminal formed on substantially the same plane by the same plate material.
The longitudinal direction of the board connection portion intersects the plane of the board.
The connection terminal further has a substrate-side connecting portion formed of the same plate material as the substrate-side terminal.
The substrate-side connecting portion has a shape in which the length along the longitudinal direction of the connection terminal is larger than the length in the width direction.
The base is connected to one end in the width direction of the substrate-side connecting portion, and the base is bent toward the substrate along one end in the width direction of the substrate-side connecting portion. Be,
A connection terminal characterized in that the bent length of the base portion is larger than the length along the direction of being raised from the substrate side connecting portion toward the substrate connecting portion. Thickness direction of the substrate-side terminals, a connection terminal according to claim 1, characterized in that intersects with the thickness direction of the substrate. The connection terminal according to claim 1 or 2 , wherein a recess communicating with the slit is provided in the vicinity of the connection portion between the intermediate portion and the joint portion. The connection terminal according to any one of claims 1 to 3 , wherein the board connecting portion further includes a bent portion. The connection terminal according to any one of claims 1 to 4 , wherein the substrate-side terminal is provided with a heat dissipation promoting portion. The connection terminal according to any one of claims 1 to 5, wherein a part or all of the substrate-side connecting portion is embedded in a molding resin. The connection terminal according to any one of claims 1 to 6 , wherein a part of the base portion is embedded in a molding resin. The connection terminal according to any one of claims 1 to 7 , wherein a part of the connection terminal is embedded in a molding resin. The connection terminal according to any one of claims 6 to 8 , wherein the molded resin constitutes a cover for accommodating the substrate. The connection terminal according to claim 1 to 9 , wherein the connection terminal is made of the same plate material as the substrate side terminal, and further includes a terminal different from the substrate side terminal. A motor device comprising the connection terminal according to claim 10 , wherein a motor to be supplied with power from the other terminal is provided. The wiper motor device according to claim 11 , wherein the motor device is for driving the wiper device.

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