JP2016119819A - Electric tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric tool which prevents a connection defect of a terminal from occurring in a brush part.SOLUTION: The electric tool comprises a rectifier motor 20 including a plurality of brush assemblies 40 each including a brush 41, a pig tail 42 fixed to the brush 41 and a brush side female terminal 43 fitted to the pig tail 42, and a plurality of power source side male terminals 34 to which the brush side female terminals 43 are connected. The power source side male terminals 34 and 34 are disposed side by side while being separated for a predetermined amount. Between the brush side female terminals 43 and 43 to be connected to the power source side male terminals 34 and 34, an energization member is installed for energizing the power source side male terminals 34 and 34 in such a direction that the power source side male terminals are separated from each other, via the brush side female terminals 43 and 43.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a power tool including a commutator motor, and more particularly to a terminal structure for supplying power to a brush.

  In general, a commutator motor includes a plurality of brush assemblies including a brush housed in a brush holder, a pigtail fixed to the brush, and a brush side terminal attached to the pigtail. By being connected to the power supply side terminal, power is supplied to the brush through the pigtail.

  As the brush side terminal, a female terminal generally called a faston terminal may be employed. In this case, the power supply side terminal is a male terminal that can be connected to and removed from the female terminal (see, for example, Patent Document 1 below).

JP 2001-145308 A

  When replacing the brush assembly in the above configuration, the female terminal as the brush side terminal is inserted into the male terminal as the power side terminal, and the terminal is deformed if an excessive force is applied at this time. There was a case. If the contact force between the terminals weakens due to this deformation, a connection failure may occur due to vibration during use of the power tool.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide an electric tool capable of preventing poor connection of terminals in a brush portion.

  An electric power tool according to the present invention includes a plurality of brush assemblies including a brush, a pigtail fixed to the brush, and a brush side female terminal attached to the pigtail, and a plurality of power supply sides to which the brush side female terminal is connected. A brush-side female terminal connected to the power-side male terminal, wherein the power-side male terminal is arranged side by side by a predetermined amount. An urging member for urging the power supply side male terminals in a direction to separate them from each other via the brush side female terminals is provided between them.

  In the electric tool according to the present invention, the urging member can be an elastic member.

  In the electric power tool according to the present invention, the power-side male terminal is formed to have a restoring force with respect to movement in a direction away from each other. The power supply side male terminal to which the female terminal is connected can be configured to move in a direction away from each other.

  Furthermore, in the electric tool according to the present invention, a defining portion that defines an installation position of the urging member can be provided.

  Furthermore, in the electric tool according to the present invention, the urging member can be detachably installed.

  ADVANTAGE OF THE INVENTION According to this invention, the electric tool which can prevent the connection failure of the terminal in a brush part can be provided.

1 is a side external view of a power tool according to an embodiment of the present invention. It is a principal part of the longitudinal cross-sectional view of the electric tool which concerns on embodiment of this invention. It is the principal part of the figure which looked at the electric tool which concerns on embodiment of this invention from back, Comprising: The state which saw through the tail cover is shown. It is the principal part of the perspective view which looked at the electric tool which concerns on embodiment of this invention from back, Comprising: The state which saw through the tail cover is shown. It is a figure which shows the principal part of the AA cross section in FIG. It is a figure which shows the principal part of the BB cross section in FIG. It is a figure which shows the electric tool which concerns on another embodiment of this invention, Comprising: It is a figure corresponded in FIG.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a preferred embodiment for carrying out the invention will be described with reference to the drawings when the invention is applied to an impact driver which is a kind of electric tool. The following embodiments do not limit the invention according to each claim, and all combinations of features described in the embodiments are not necessarily essential to the solution means of the invention. .

  First, an impact driver that is an electric tool according to an embodiment of the present invention will be described with reference to FIGS.

  Here, FIG. 1 is a side external view of the electric power tool according to the embodiment of the present invention, and FIG. 2 is a main part of a longitudinal sectional view of the electric power tool according to the embodiment of the present invention. FIG. 3 is a main part of a view of the electric power tool according to the embodiment of the present invention as viewed from the rear, and shows a state where the tail cover is seen through. FIG. 4 is a main part of a perspective view of the power tool according to the embodiment of the present invention as viewed from the rear. Further, in the present specification, as shown in the drawing, “front, rear, left, right, upper, lower” are defined and described.

  As shown in FIGS. 1 to 4, an impact driver 1 that is an electric tool according to an embodiment of the present invention includes a main body unit 10 that houses a commutator motor 20 and a drive unit transmission unit 15, and a lower part from the main body unit 10. And a handle portion 60 extending in the direction. A trigger switch 61 for operating the impact driver 1 is provided on the upper front side of the handle portion 60, and a battery pack (not shown) is detachably attached to the lower portion of the handle portion 60. A part 62 is provided. A tool attachment portion 50 to which a work tool such as a driver bit is attached is provided at the front portion of the main body portion 10 so as to protrude forward. Since the basic configuration of the impact driver 1 of the present embodiment is conventionally known, further detailed description is omitted.

  The impact driver 1 includes left and right housings 51 and 52 having a left and right split configuration, and a tail cover 53 connected to the rear of the left and right housings 51 and 52, as outer housings. The left and right housings 51 and 52 and the tail cover 53 are made of resin.

  In the commutator motor 20, a rotor 21 having a commutator 22 provided at the rear part is accommodated in the main body 10 with the axis line being the front-rear direction. Two brushes 41, 41 are in sliding contact with the commutator 22. The rear end shaft portion of the rotor 21 is rotatably supported by a bearing 25 attached to the bearing support portion 24 of the brush holder base 23 fixed to the rear portions of the housings 51 and 52. The brush holder base 23 is provided with a brush portion 30.

  The schematic structure of the impact driver 1 that is the electric tool according to the embodiment of the present invention has been described above. Next, the configuration of the brush unit 30 will be described.

  As shown in FIGS. 3 and 4, the brush portion 30 includes a brush holder 31 attached to the brush holder base 23, a brush assembly 40 having a brush 41 accommodated in the brush accommodating portion 32 of the brush holder 31, and a brush And a spring 36 that presses 41 toward the commutator 22. The brush assembly 40 includes a brush 41, a pigtail 42 as a conducting wire fixed to the brush 41, and a brush-side female terminal 43 attached to the end of the pigtail 42. Further, the brush holder 31, the brush assembly 40, and the spring 36 are disposed substantially symmetrically with respect to a vertical plane passing through the center line on the lower side of the center of the rotor 21.

  Next, in addition to the reference diagrams of FIGS. 5 and 6, characteristic portions of the brush unit 30 will be described. Here, FIG. 5 is a diagram showing the main part of the AA cross section in FIG. 2, and FIG. 6 is a diagram showing the main part of the BB cross section in FIG.

  The brush holder 31 houses a plate-shaped base 33 that contacts the rear surface of the brush holder base 23, a substantially rectangular parallelepiped brush 41, and a cylindrical brush housing portion 32 that guides the brush 41 toward the commutator 22, A power supply unit 35 connected to a power source extending on the front side of the brush holder base 23, and a plate-shaped power source standing rearward from the end of the base 33 below the center of the rotor 21 And a side male terminal 34. These members are made of a conductive material. The brush side female terminal 43 of the brush assembly 40 is detachably connected to the power source side male terminal 34. The brush-side female terminal 43 is made of a conductive material having elasticity, and a structure generally called a faston terminal is adopted. That is, the brush-side female terminal 43 is formed so as to sandwich the power-side male terminal 34 by its elastic force while being inserted into the plate-like power-side male terminal 34. The contact between the power-side male terminal 34 and the brush-side female terminal 43 is maintained by this clamping. Therefore, the power supplied to the brush holder 31 by the power supply unit 35 is supplied from the power supply side male terminal 34 to the brush 41 via the brush side female terminal 43 and the pigtail 42.

  As well shown in FIG. 5, the power-side male terminals 34, 34 included in the left and right brush holders 31, 31 are arranged substantially in parallel in the left-right direction with a predetermined amount apart. Then, the brush side female terminals 43 and 43 of the brush assemblies 40 and 40 are respectively inserted into the power source side male terminals 34 and 34 from the rear toward the front.

  The brush-side female terminals 43 and 43 inserted into the power-side male terminals 34 and 34 are separated from each other by a predetermined amount, and an elastic member 44 as an urging member is detachable between the brush-side female terminals 43 and 43. It is installed by pushing in. The elastic member 44 is a member made of an insulating rubber material, and is formed in a cylindrical shape having a diameter larger than the distance between the brush-side female terminals 43 and 43 in a natural state. In a state where the elastic member 44 is installed between the brush-side female terminals 43 and 43, the elastic member 44 is contracted and deformed by a predetermined amount due to contact with the brush-side female terminals 43 and 43. Therefore, the elastic restoring force of the elastic member 44 against the contraction deformation biases the power supply side male terminals 34 and 34 in the direction away from each other via the brush side female terminals 43 and 43, so that the brush side female terminals 43 and 43 The contact force to the power supply side male terminals 34, 34 can be increased.

  Further, the brush holder base 23 is provided with an upper columnar convex portion 26 and a lower columnar convex portion 27 projecting rearward from the base portion of the brush holder base 23 between the brush side female terminals 43 and 43. The upper and lower elastic members 44 are formed close to each other. The upper columnar convex portion 26 and the lower columnar convex portion 27 serve as a restricting portion that restricts the installation position of the elastic member 44 in the vertical direction, thereby effectively preventing the elastic member 44 from being detached from the installation position. it can.

  Further, as shown in FIG. 6, a front convex portion 28 that protrudes rearward from the base portion of the brush holder base 23 is formed in front of the elastic member 44. It is installed in contact with the convex portion 28. A rear convex portion 29 is formed on the inner surface of the tail cover 53 facing the elastic member 44 so as to protrude forward and near the rear end of the elastic member 44. Since the front convex portion 28 and the rear convex portion 29 serve as a restricting portion that restricts the installation position of the elastic member 44 in the front-rear direction, the separation of the elastic member 44 from the installation position can be effectively prevented.

  As described above, the impact driver 1 that is the electric tool according to the embodiment of the present invention arranges the power-side male terminals 34 and 34 in a substantially parallel manner in the left-right direction with a predetermined distance therebetween. The elastic member 44 that urges the power supply side male terminals 34, 34 in the direction of separating them from each other via the brush side female terminals 43, 43 is installed between the brush side female terminals 43, 43 inserted into the brush side female terminals 43, 43. As a result, the contact force of the brush-side female terminals 43, 43 to the power-side male terminals 34, 34 is increased, and the connection state between the brush-side female terminals 43, 43 and the power-side male terminals 34, 34 is further stabilized. Can do. Therefore, it is possible to prevent a connection failure between the brush side female terminals 43 and 43 and the power source side male terminals 34 and 34 due to vibration generated when the impact driver 1 is used.

  Moreover, by having set it as the above-mentioned structure, the contact force of the connection part of the two brush side female terminals 43 and the power supply side male terminals 34 can be heightened with one elastic member 44, The installation number of the elastic members 44 can be increased. Can be reduced. That is, the number of elastic members that are urging members can be reduced to half of the configuration in which one elastic member is installed for one brush-side female terminal. Therefore, it can contribute to size reduction of the apparatus.

  Further, an upper columnar convex portion 26 for restricting the installation position of the elastic member 44 on the upper side, the lower side, the front side, and the rear side of the elastic member 44 that is an urging member installed between the brush side female terminals 43, 43, Since the lower columnar convex portion 27, the front convex portion 28, and the rear convex portion 29 are provided, it is possible to prevent the elastic member 44 from being detached from the installation position. Therefore, it is possible to eliminate the possibility that the elastic member 44 is detached from the installation position due to vibration or the like generated when the impact driver 1 is used, and that the connection between the brush-side female terminals 43 and 43 and the power-side male terminals 34 and 34 is poor. it can.

  In the above-described embodiment, the elastic member 44 has a cylindrical shape, but is not limited thereto. For example, it may be a quadrangular prism shape. Moreover, in the above-mentioned embodiment, although the commutator motor 20 was a thing of the structure provided with the two brushes 41, it is not limited to this. For example, a commutator motor having four brushes may be used. In this case, two places where two power supply side male terminals are arranged side by side by a predetermined amount are provided.

  The impact driver that is the electric tool according to the embodiment of the present invention has been described above. Next, an impact driver according to another embodiment of the present invention will be described with reference to FIG. In addition, the impact driver which concerns on another embodiment of this invention is a modification of the impact driver which is the electric tool which concerns on the above-mentioned embodiment, Comprising: The impact driver which is the electric tool which concerns on the above-mentioned embodiment is a brush part Only the configuration of is different. Therefore, the following description will be made with a focus on the configuration of the brush portion, and the same reference numerals are assigned to members similar to those in the above-described embodiment, and the description may be omitted.

  Here, FIG. 7 is a figure which shows the electric tool which concerns on another embodiment of this invention, Comprising: It is a figure equivalent to FIG.

  The brush part 130 of the impact driver 100, which is an electric power tool according to another embodiment of the present invention, has power supply-side male terminals 134, 134 arranged in the left-right direction with a predetermined distance therebetween. The brush side female terminals 43 and 43 of the brush assemblies 40 and 40 are detachably connected to the power source side male terminals 134 and 134. A spacer 144 that is an urging member that urges the power supply side male terminals 134 and 134 in the direction of separating them from each other via the brush side female terminals 43 and 43 is detachably installed between the brush side female terminals 43 and 43. Has been. The spacer 144 is formed of an insulating material, and the power supply-side male terminals 134 and 134 are moved away from each other with respect to the initial position when the spacer 144 is not installed. doing. That is, the power supply side male terminals 134 and 134 are arranged in a parallel state at the initial position, and are deformed into a C-shape opened rearward by the installation of the spacer 144.

  The power supply-side male terminals 134 and 134 are made of an elastic conductive material, and a return force is generated to return to the initial position in which the spacer 144 is not installed with respect to movement in a direction away from each other. It is formed to do. This restoring force increases the contact force of the power supply side male terminals 134, 134 with the brush side female terminals 43, 43, so that the connection state between the brush side female terminals 43, 43 and the power supply side male terminals 134, 134 is further stabilized. be able to. Therefore, it is possible to prevent poor connection between the brush-side female terminals 43 and 43 and the power-side male terminals 134 and 134 due to vibration generated when the impact driver 100 is used.

  In the above-described another embodiment, the power supply side male terminals 134 and 134 are formed of a conductive material having elasticity in order to generate a restoring force. However, the present invention is not limited to this. For example, an elastic member such as a spring may be configured so that the power-side male terminals have a return force to return to the initial position with respect to movement in a direction away from each other. In other words, any configuration can be used as long as the power supply-side male terminal can have a restoring force.

DESCRIPTION OF SYMBOLS 1 Impact driver, 10 Main part, 15 Drive part transmission part, 20 Commutator motor, 21 Rotor, 22 Commutator, 23 Brush holder base, 24 Bearing support part, 25 Bearing, 26 Upper columnar convex part, 27 Lower columnar shape Convex part, 28 Convex part, 29 Convex part, 30 Brush part, 31 Brush holder, 32 Brush accommodating part, 33 Base, 34 Power supply side male terminal, 35 Power supply part, 36 Spring, 40 Brush assembly, 41 Brush , 42 Pigtail, 43 Brush side female terminal, 44 Elastic member, 50 Tool mounting portion, 51 Housing, 51 Left and right housing, 52 Housing, 52 Left and right housing, 53 Tail cover, 60 Handle portion, 61 Trigger switch, 62 Battery pack mounting portion , 100 Impact driver, 130 Brush part, 134 Power supply side male terminal, 1 44 Spacer

Claims (5)

A commutator having a plurality of brush assemblies including a brush, a pigtail fixed to the brush, and a brush-side female terminal attached to the pigtail, and a plurality of power-side male terminals to which the brush-side female terminal is connected In an electric tool equipped with an electric motor,
The power supply side male terminals are arranged side by side by a predetermined amount,
Between the brush side female terminals connected to the power source side male terminals, a biasing member that biases the power source side male terminals in a direction to be separated from each other via the brush side female terminals is installed. A featured electric tool.   The power tool according to claim 1, wherein the urging member is made of an elastic member. The power supply side male terminal is formed so as to have a restoring force with respect to movement in a direction away from each other,
The power supply-side male terminal connected to the brush-side female terminal is configured to move in a direction away from each other by the installation of the urging member. Electric tool.   The electric tool according to any one of claims 1 to 3, wherein a defining portion that defines an installation position of the urging member is provided. The power tool according to claim 1, wherein the urging member is detachably installed.

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