JP4710667B2 - Capacitor unit - Google Patents

Description

  The present invention relates to an emergency power source for an electronic device using a battery or the like, and more particularly to a capacitor unit used in an electronic brake system or the like that electrically brakes a vehicle.

  In recent years, the development of hybrid cars and electric cars has been rapidly progressing, and accordingly, various proposals from conventional mechanical hydraulic control to electrical hydraulic control have also been made for vehicle braking.

  Generally, a battery is used as a power source to electrically control the hydraulic pressure of the vehicle. In this case, if the power supply is cut off for some reason, the hydraulic control cannot be performed and the vehicle cannot be braked. There is a possibility.

  Accordingly, proposals have been made to cope with an emergency by mounting a plurality of large-capacity capacitors as emergency auxiliary power supplies separately from the battery.

As a prior art document related to this application, for example, Patent Document 1 is known.
JP 2005-93758 A

  An example (disassembled perspective view) of a capacitor component of such a capacitor unit is shown in FIG.

  The two lead wires 2 provided on one end face of the plurality of capacitors 1 are bent into a crank shape as shown in FIG. Thereby, even if the vibration of the vehicle is applied to the lead wire 2, the lead wire 2 is absorbed, so that the disconnection is difficult and the reliability is improved. However, since the capacitor 1 is still disjointed at the stage of bending the lead wire 2, the lengths of the two lead wires 2 are different from each other, although it is difficult to understand in FIG. is there.

  Thus, the capacitors 1 that have been prepared for bending the lead wires 2 are inserted into the lead wire holes 4 of the circuit board 3 so that the polarities are not mistaken. As a result, the capacitor 1 is arranged in the direction perpendicular to the circuit board 3. Although not shown in the figure, circuit components that electrically control the capacitor 1 such as a charge / discharge circuit and a state detection circuit of the capacitor 1 may be mounted in advance.

  Next, the capacitor 1 is inserted into the resin holding portion 5. At this time, although not shown, a rib and an elastic portion are provided inside the capacitor insertion hole of the holding portion 5, so that the body portion of the capacitor 1 is held and fixed by these.

  After the capacitor 1 is inserted, the circuit board 3 is fixed to the holding part 5 by fastening four screws (not shown) to the boss 7 integrally formed with the holding part 5 through the circuit board screw hole 6.

  Since the capacitor 1 and the circuit board 3 have been fixed to the holding portion 5 so far, all of the extra portions of the two lead wires 2 having different lengths are cut next in order to distinguish the polarities. Finally, all the two lead wires 2 of each capacitor 1 are electrically connected to the circuit board 3 by soldering.

  In this way, since the lead wire 2 is soldered after the capacitor 1 and the circuit board 3 are fixed to the holding portion 5, the stress on the solder connecting portion during assembly due to soldering before fixing is reduced. Therefore, reliability can be improved.

  The capacitor unit having such a configuration can be used satisfactorily as an auxiliary power source for vehicle braking not only at the time of assembly but also from the viewpoint of improving the reliability of the solder portion against vehicle vibration during use.

  However, in particular, in the case where the required number of capacitors 1 is small as a specification of the capacitor unit, the height of the capacitor unit is not changed as long as it has a structure in which the capacitor 1 is mounted in the vertical direction with respect to the circuit board 3. The size of the substrate 3 is not much different from the conventional one by mounting circuit components such as a charge / discharge circuit and a state detection circuit. As a result, even if the number of capacitors 1 is reduced, the volume of the capacitor unit becomes the same as the conventional one, and there is a restriction on the place where it can be installed in a limited space in the vehicle. Therefore, there has been a problem that a small and low profile is necessary to increase the degree of freedom of installation.

  The present invention solves the above-described conventional problems, and an object of the present invention is to provide a capacitor unit that can achieve both a compact and low-profile configuration and ensuring reliability.

  In order to solve the conventional problems, a capacitor unit of the present invention is provided with a plurality of capacitors, a circuit board that connects the capacitors in series, parallel, or series-parallel, and one end face of each capacitor, Are bent so that their tips are perpendicular to the length direction of the capacitor, and two lead wires inserted into lead wire holes provided in the circuit board, and the capacitor And a base part integrally forming a circuit board fixing part to which the circuit board is fixed, and a case containing the circuit board, and the tip side of the capacitor is While being held by the holding portion, the circuit board is fixed to the circuit board fixing portion, and the circuit board and each lead wire are connected. In which the base portion is formed is inserted into the case from the circuit board side.

  With this configuration, the tip of the capacitor lead wire is aligned in one direction and bent at right angles, so that it can be mounted horizontally with respect to the circuit board, and the lead wire connection can be inserted into the holding part of the capacitor and the circuit board Since it can be performed after fixing, it is connected in a state where no stress is applied to the lead wire as in the prior art. As a result, the object can be achieved.

  According to the capacitor unit of the present invention, a small and low-profile configuration is possible by mounting the capacitor in the horizontal direction with respect to the circuit board, and a lead wire can be connected without applying stress, so that high reliability can be obtained simultaneously.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

(Embodiment)
FIG. 1 is a partially exploded perspective view of a circuit board of a capacitor unit according to an embodiment of the present invention. FIG. 2 is a partial cross-sectional view of the base unit and the circuit board after holding the capacitor of the capacitor unit according to the embodiment of the present invention. FIG. 3 is an enlarged perspective view of a circuit board fixing portion of another configuration of the capacitor unit according to the embodiment of the present invention. FIG. 3A is a perspective view when the cross section of the circuit board fixing protrusion is triangular. These show perspective views when the circuit board is screwed. FIG. 4 is a perspective view after the internal assembly of the capacitor unit according to the embodiment of the present invention. FIG. 5 is an exploded perspective view of the entire capacitor unit according to the embodiment of the present invention. FIG. 6 is a cross-sectional view of the case of the capacitor unit according to the embodiment of the present invention.

  In each figure, the same components as those in the conventional example shown in FIG. 7 will be described using the same reference numerals.

  In FIG. 1, a plurality of capacitors 1 (an example in which the required number is six is shown in the present embodiment) is a cylindrical electric double layer capacitor. Two lead wires 2 are provided on one end face (left side face in FIG. 1) of each capacitor 1. The two lead wires 2 have the same polarity in advance, that is, for example, in the lead wire 2 in the capacitor 1 of FIG. 1, the lead wire 2 in front (left side when viewed from the top of the capacitor 1). The lead wire 2 is bent so that the tip of the lead wire 2 is perpendicular to the length direction of the capacitor 1 with the lead wire 2 (same as the right side) aligned so as to be the negative electrode. .

  In this way, if the tip of the lead wire 2 is bent at a right angle with respect to the length direction of the capacitor 1, the polarity can always be distinguished. Therefore, the lead wire 2 having a different length depending on the polarity is left as it is. There is no need to keep it. Therefore, the tips of the two lead wires 2 are cut in advance to a predetermined length. It should be noted that the predetermined length is a length that is not excessive or insufficient when the capacitor 1 is mounted.

  Further, a bent portion 2 a is provided on a part of each lead wire 2 in a direction perpendicular to the length direction of the capacitor 1 (vertical direction in FIG. 1). The bent portion 2a is formed by bending the lead wire 2 into a semicircular shape as shown in FIG. Thus, external stress such as vehicle vibration applied to the lead wire 2 can be absorbed, and high reliability can be obtained. Here, the shape of the bent portion 2 a is not limited to a semicircular shape, and may be a “<” shape, for example.

  Note that an explosion-proof valve 11 is provided on the tip side of the capacitor 1 (side face without the lead wire 2) to suppress an increase in internal pressure.

  The capacitor 1 in which the lead wire 2 is processed in this way is inserted into a lead wire hole 4 provided in the circuit board 3 as shown in the left diagram of FIG. By adopting such a configuration, the capacitor 1 is disposed in the horizontal direction with respect to the circuit board 3, so that the capacitor unit can be reduced in size and height. In the present embodiment, circuit components (excluding the capacitor 1) for electrically controlling the capacitor 1 such as a charge / discharge circuit and a state detection circuit are soldered and mounted on the circuit board 3 in advance. Among them, the heat generating component 12 such as an FET is mounted in a state of being attached to the heat sink 13. Thereby, the heat generation of the heat generating component 12 is suppressed. The heat sink 13 is fixed to the circuit board 3 with screws (not shown).

  A connector 14 is mounted at the end of the circuit board 3 on the extension of the capacitor 1 in the length direction, that is, at the left end of the circuit board 3 in FIG. The terminals of the connector 14 are mounted so as to be on the left side of the circuit board 3 in FIG. This means that the terminals are mounted so as to be in the insertion direction of the circuit board 3 into the case 20 (described later). The connector 14 is partially fixed to the circuit board 3 with screws (not shown). Drawing of other circuit components is omitted in FIG.

  Here, a specific method for inserting the capacitor 1 into the lead wire hole 4 will be described. First, as shown in the left diagram of FIG. 1, the circuit board 3 is fitted into the capacitor receiving jig 1a. At this time, although not shown in FIG. 1, the capacitor receiving jig 1a includes the circuit board 3 so that the circuit components mounted on the back surface of the circuit board 3 are not affected by the stress from the capacitor receiving jig 1a. A recess is provided at a position corresponding to the circuit component mounted on the back surface of the substrate.

  Next, when the capacitor 1 is fitted into the capacitor receiving jig 1a, the lead wires 2 are inserted into the lead wire holes 4, respectively. At this time, since the capacitor receiving jig 1a has six semicircular recesses slightly larger than the outer diameter of the capacitor 1 at positions corresponding to the capacitor 1, the position of the capacitor 1 with respect to the circuit board 3 can be easily set. I can almost decide.

  Next, after the capacitor 1 is arranged, the capacitor rear holding jig 1b is lowered from above the circuit board 3 in the direction of the thick arrow. This may be lowered electrically by an automatic machine or manually. The capacitor rear pressing jig 1b has a comb shape as shown in FIG. 1, and is processed so that the width of each comb is slightly narrower than the interval between the two lead wires 2. Accordingly, when the capacitor rear pressing jig 1b has finished descending to the surface of the circuit board 3, the above-described comb portions come into contact with the side surfaces of the capacitor 1 on the lead wire 2 side. With these jigs, the capacitor 1 is positioned so as not to put a burden on the lead wire 2 even though the capacitor 1 is not soldered to the circuit board 3.

  Next, the base portion 15 that holds and fixes the capacitor 1 and the circuit board 3 will be described. The base portion 15 is formed by injection molding resin, and the holding portion 5 of the capacitor 1, the circuit board fixing portion 16, the elastic protrusion 17 and the like are integrally formed.

  First, since the capacitor 1 is cylindrical, the holding portion 5 is similarly cylindrical as shown on the right side of FIG. The cylindrical shape was provided with four cutout portions 5b halfway. As a result, the cylinder is divided into four parts. Among them, the elastic part 5a is formed by thickening the tip of the notch part 5b in any two opposing positions, and in the remaining two parts, At least one rib 5e is provided in the length direction of the cylinder. Accordingly, the holding portion 5 has a configuration in which the elastic portion 5 a is arranged along the outer periphery of the capacitor 1 after the capacitor 1 is inserted.

  Since the cylindrical inner diameter is formed to be slightly larger than the outer diameter of the capacitor 1, the capacitor 1 is held by using the capacitor receiving jig 1a and the capacitor rear holding jig 1b from the direction of the arrow in FIG. When inserted into 5, the capacitor 1 is guided in a direction parallel to the cylindrical shape while abutting against the rib 5e while expanding the elastic portion 5a. Therefore, the capacitor 1 is firmly held and fixed by the elasticity of the elastic portion 5a while being positioned by the rib 5e. By adopting such a configuration, the tolerance of the capacitor 1 and the holding portion 5 can be absorbed, so that the capacitor 1 can be fixed securely. In addition, the notch part 5b is not specifically limited to four places.

  In order to prevent the front end side of the capacitor 1 from coming into contact with the base portion 15 when the capacitor 1 is inserted into the holding portion 5, the holding portion 5 is a cross-sectional view taken along the alternate long and short dash line in the base portion 15 of FIG. 1. As shown in the state after the capacitor 1 and the circuit board 3 are inserted into the base portion 15 in the assembly process described later, the base 5c connected to the elastic portion 5a is provided. Further, the pedestal 5c is provided with a hollow space 5d at the center of the pedestal 5c so that even if the explosion-proof valve 11 operates, the operation is not hindered. As a result, the capacitor 1 can be easily held in a normal position by inserting the tip of the capacitor 1 into the elastic portion 5a until it contacts the pedestal 5c, and the tip of the capacitor 1 is inserted into the elastic portion 5a. Since the side explosion-proof valve 11 is just opposite to the space 5d, the explosion-proof valve 11 can be operated. Furthermore, since the leaked electrolyte stays in the space 5d, the electrolyte does not adhere to the outside of the holding portion 5. Note that if the tip end side of the capacitor 1 is held in direct contact with the base portion 15, the explosion-proof valve 11 cannot be operated. Therefore, it is necessary to secure an operation space of the explosion-proof valve 11 such as the above-described space 5d. Therefore, as long as the operation space of the explosion-proof valve 11 can be secured, the structure is not limited to the above.

  By adopting the structure of the holding portion 5 as described above, it is possible to prevent leakage of the electrolytic solution while firmly fixing the capacitor 1 at a proper position by simply fitting the capacitor 1, thereby improving reliability.

  Next, details of the circuit board fixing portion 16 for fixing the circuit board 3 will be described. The circuit board fixing portion 16 is integrally formed so as to protrude from the vicinity of the lower end of the base portion 15 in a direction perpendicular to the base portion 15. A circuit board fixing protrusion 16a and a circuit board fixing claw portion 16b are integrally formed with the base portion 15 so that the circuit board fixing portion 16 is disposed at the tip of the circuit board fixing portion 16 in an extension portion in the length direction of the circuit board fixing portion 16. . Details of this portion will be described with reference to FIG.

  The circuit board fixing protrusion 16a and the circuit board fixing claw portion 16b are configured by providing an interval substantially equal to the thickness of the circuit board 3 in the height direction. Further, the circuit board fixing claw portion 16b has elasticity and has a structure in which a tapered shape is formed in part. As shown in FIG. 2, the tapered shape is provided at a position where the tapered shape fits with a circuit board fixing hole 3b provided in the circuit board 3. Further, an inclined portion 16c that abuts on an end portion of the circuit board 3 (the right end of the circuit board 3 indicated by a round dotted line in FIG. 2) is provided at the base portion of the circuit board fixing claw portion 16b.

  The circuit board fixing claw portion 16 b is disposed on the upper side of the circuit board 3 and in the vicinity of the end of the circuit board 3. In order to prevent the circuit board fixing claw 16b from interfering with the capacitor 1, the circuit board fixing claw 16b is provided at the end of the circuit board 3 as much as possible (the front right end and the rear right end in FIG. 1). This is because the distance between the substrate fixing claw portion 16b and the capacitor 1 can be narrowed, and the size and height can be reduced.

  Further, the circuit board fixing protrusion 16a is larger than the circuit board fixing claw portion 16b. This is because the circuit board fixing protrusion 16a is responsible for positioning the circuit board 3. If this portion is weak, the position of the circuit board 3 may be displaced due to external vibration or the like, and reliability may be impaired. In order to make the circuit board fixing protrusion 16a larger than the circuit board fixing claw portion 16b, the thickness is increased in the present embodiment. However, this may increase the width, increase the length, May be combined.

  Further, when the circuit board 3 is inserted into the circuit board fixing portion 16, the circuit board fixing protrusion 16a is arranged at a position that does not overlap the circuit board fixing hole 3b. That is, as shown in the right diagram of FIG. 1, the circuit board fixing protrusion 16a and the circuit board fixing claw portion 16b are arranged at positions shifted from each other. As a result, when the circuit board 3 is inserted into the circuit board fixing portion 16, whether or not the circuit board fixing claw portion 16b is normally fitted in the circuit board fixing hole 3b can be easily confirmed visually. Will improve.

  In addition, the part shown with the round dotted line of FIG. 1 in the circuit board fixing | fixed part 16 is good also as a structure shown to FIG. 3 (a), (b).

  First, in the configuration of FIG. 3A, two circuit board fixing protrusions 16 a are integrally formed at the tip of the circuit board fixing portion 16. Here, the cross section of the circuit board fixing protrusion 16a is triangular, and a tapered shape is formed on the lower side of the triangle so as to become thicker as it approaches the root. As a result, as indicated by solid arrows in FIG. 3A, the positioning recess 3a provided in the circuit board 3 has a positional relationship corresponding to the circuit board fixing protrusion 16a, so that the circuit board 3 is connected to the circuit board fixing protrusion 16a. And the circuit board fixing claw portion 16b can be easily and accurately inserted.

  The circuit board fixing claw portion 16b is integrally formed at the tip of the circuit board fixing portion 16 like the circuit board fixing protrusion 16a. Further, the circuit board fixing protrusion 16a is formed at a position substantially equal to the thickness of the circuit board 3 in the height direction (downward in FIG. 3A), and has an elastic structure. Accordingly, when the circuit board 3 is inserted between the circuit board fixing protrusion 16a and the circuit board fixing claw portion 16b, the circuit board is fitted into the circuit board fixing hole 3b provided in the circuit board 3 at a position corresponding to the circuit board fixing claw portion 16b. . This is because the circuit board fixing hole 3b has a slightly larger shape than the circuit board fixing claw portion 16b. At this time, since the length of the positioning recess 3a is shorter than the length of the circuit board fixing protrusion 16a, the tip of the circuit board fixing protrusion 16a is positioned until the circuit board fixing claw 16b is fitted into the circuit board fixing hole 3b. It is pushed deeper than 3a. Thereby, in addition to the fitting of the circuit board fixing claw portion 16b to the circuit board fixing hole 3b, the circuit board 3 is connected to the circuit board fixing protrusion 16a and the circuit by the reaction force to the surface of the circuit board 3 by the circuit board fixing protrusion 16a. It is firmly fixed from both surfaces of the substrate fixing claw portion 16b.

  As described above, the circuit board 3 is inserted with the positioning recess 3a and the circuit board fixing protrusion 16a aligned, so that the circuit board 3 can be inserted more easily and accurately than the configuration of FIG. 1 and the circuit board 3 is firmly fixed. Therefore, high reliability against external stress such as vehicle vibration can be obtained.

  Here, since the circuit board fixing protrusion 16a is narrow, when the circuit board 3 is inserted, stress tends to concentrate on the root. Therefore, in FIG. 3A, a round is provided at the base portion to reinforce. In addition to this method, the number of the circuit board fixing protrusions 16a is larger than that of the circuit board fixing claw parts 16b, the circuit board fixing protrusions 16a are made larger than the circuit board fixing claw parts 16b, or they are performed simultaneously. It is good.

  Further, when the circuit board 3 is inserted into the circuit board fixing portion 16, the circuit board fixing protrusion 16a is disposed at a position that does not overlap the circuit board fixing hole 3b. Thereby, it is possible to visually confirm that the circuit board fixing claw portion 16b is fitted in the circuit board fixing hole 3b as in the configuration of FIG.

  3B, the positioning projection 16e is integrally formed on the circuit board fixing portion 16, and the positioning recess 3a is provided on the circuit board 3 at a position corresponding to the positioning projection 16e. When fixed to the circuit board fixing portion 16, the positioning protrusion 16e is fixed by a plurality of screws 6a in a state of being inserted into the positioning recess 3a. As a result, the positioning of the circuit board 3 is facilitated, and the positions of the circuit board screw holes 6 provided in the circuit board 3 and the base part screw holes 16d provided in the circuit board fixing portion 16 coincide with each other. Tightening is also easy. For this reason, a yield improves and high reliability is acquired.

  Next, the elastic protrusion 17 will be described. The elastic protrusion 17 is a portion for fixing a base portion 15 to which the circuit board 3 is fixed and a case 20 to be described later, and a tapered case fixing claw portion 21 as shown on the right side of FIG. It is. In the present embodiment, since the elastic protrusions 17 are formed at two locations above and below the base portion 15, the base portion 15 and the case 20 are fixed at two locations.

  The detailed structure of the base portion 15 is as described above. Here, a method for fixing the circuit board 3 to the base portion 15 will be described.

  First, in FIG. 1, the circuit board 3 is inserted between the circuit board fixing protrusion 16a and the circuit board fixing claw 16b from the direction of the arrow so that the circuit board fixing claw 16b corresponds to the circuit board fixing hole 3b of the circuit board 3. To do. Thereby, the circuit board fixing claw part 16b and the circuit board fixing hole 3b at the position corresponding to the circuit board fixing claw part 16b are respectively fitted, and the circuit board 3 and the base part 15 are fixed as shown in FIG. At this time, since the front end side of each capacitor 1 is inserted into the holding portion 5 simultaneously with the fitting, the capacitor 1 is fixed at the same time. However, the capacitor 1 is positioned by the capacitor receiving jig 1a, and the capacitor rear presser is cured. Since the tool 1b is fixed so as not to move when inserted into the holding portion 5, no stress is applied to the lead wire 2 until the insertion of the capacitor 1 into the holding portion 5 is completed. Therefore, since the circuit board 3 and the base portion 15 can be fixed without applying stress to the lead wire 2, high reliability can be obtained.

  By fixing the circuit board 3 and the base portion 15 by the above assembling method, the capacitor 1 is firmly fixed to the holding portion 5 without applying stress to the lead wire 2. It is not necessary to fix with. Accordingly, first, the capacitor rear pressing jig 1b is moved upward and removed, and then the circuit board 3 is removed from the capacitor receiving jig 1a.

  The state assembled so far is shown in FIG. The capacitor 1 is held by the holding portion 5, and the circuit board 3 is sandwiched between the circuit board fixing claw 16 b and the circuit board fixing protrusion 16 a that is not shown in FIG. 4 but is arranged on the back side of the circuit board 3. Each is fixed to the base portion 15.

  Next, since the lead wire 2 of the capacitor 1 is not soldered to the circuit board 3 at this time, each lead wire 2 is soldered with the circuit board 3 facing down in the state of FIG. Thereby, the lead wire 2 is electrically connected to the circuit board 3. Further, in this state, since the capacitor 1 and the circuit board 3 are already fixed to the base portion 15, no stress is applied to the soldered portion of the lead wire 2, and the same soldering reliability as in the prior art can be obtained.

  In addition, since each lead wire 2 is cut into a predetermined length in advance, a step of cutting the lead wire 2 before soldering as in the prior art becomes unnecessary, and an effect of improving productivity can be obtained.

  The circuit board 3 is formed with a circuit pattern in which at least the capacitors 1 are connected in series, parallel, or series-parallel (in this embodiment, six are connected in series). 1 is connected to be one of the above circuits.

  Next, the case 20 containing the circuit board 3 will be described with reference to FIG. At this stage, since all the circuit components including the capacitor 1 are mounted on the circuit board 3, the case 20 enclosing the circuit board 3 means that the case 20 is mounted on the circuit board 3. All circuit components will be included. At this time, since the capacitor 1 is mounted in the horizontal direction with respect to the circuit board 3, it is possible to reduce the size and height.

  The case 20 is formed by injection molding with the same resin as the base portion 15 so as to have the shape shown on the left side of FIG. The case 20 is integrally formed with a connector hole 22 for partially protruding the tip of the case 14 from the case 20 in order to connect the connector 14 to an external wiring (not shown). The connector hole 22 is larger than the outer dimension of the connector 14, and is provided on a surface (the left surface in FIG. 5) facing the base portion insertion port 23 of the case 20. As a result, the connector 14 can be connected to the external wiring, and the connector 14 can be disposed in the same plane as the circuit board 3 on which the capacitor 1 is mounted, so that the height can be reduced.

  Further, grooves 24 for inserting the circuit board 3 and positioning in the case 20 are provided on the wall surfaces on both sides of the base portion insertion port 23 (the left and right wall surfaces in FIG. 5). Details of the groove 24 will be described later.

  Further, in order to fix the base portion 15 to the case 20, a locking portion 25 that fits with a case fixing claw portion 21 provided at the tip of the elastic protrusion 17 is also integrally formed. In addition, the latching | locking part 25 was penetrated and the magnitude | size was made into the shape a little larger than the case fixing claw part 21. As shown in FIG. Thereby, since the case fixing claw part 21 fits into the latching | locking part 25 reliably, the case 20 and the base part 15 can fully be fixed. Further, the same number of locking portions 25 as the elastic protrusions 17 are provided. These numbers are two in the present embodiment, but may be appropriately increased depending on the size of the base portion 15 and the case 20.

  When the circuit board 3 is inserted into the case 20, the circuit board abutting portion 20a is integrally formed with the case 20 so that one side (the left side in FIG. 5) farthest from the base portion 15 abuts. Is provided. The detailed shape of the circuit board abutting portion 20a is perpendicular to the side (left side) of the circuit board 3 that abuts on the circuit board abutting portion 20a as shown in FIG. 6 (cross-sectional view of the case 20 taken along the dashed line in FIG. 5). The structure has a case inclined portion 20b so that stress is applied in the direction (downward in FIG. 6). The circuit board 3 is firmly fixed by this stress. The fixed state of the circuit board 3 after completion of assembly will be described later.

  Here, the detail of the groove | channel 24 is demonstrated, referring FIG. The height of the groove 24 is set higher than the thickness of the circuit board 3 on the base part insertion port 23 side to provide a margin. Thereby, it becomes easy to insert the circuit board 3 into the groove 24.

  The tip of the groove 24 is configured to have a shape with a narrow width (corresponding to a height here). Specifically, either one of the upper and lower sides (here, the upper side) of the groove 24 is formed to be a tapered portion 26 in the vicinity of the tip. Thus, when the circuit board 3 is inserted into the groove 24, the circuit board 3 is placed on the lower side of the groove 24, that is, on the reference side for positioning the circuit board 3 by the taper forming portion 26 provided near the tip of the groove 24. Thus, the circuit board 3 can be easily fixed at a normal position.

  With this configuration, since the positioning of the circuit board 3 is completed when the circuit board 3 is inserted all the way into the groove 24, the connector 14 can accurately protrude from the connector hole 22 without contacting the case 20. . Therefore, it is possible to prevent stress from being applied to the soldered portion of the connector 14 due to the connector 14 coming into contact with the case 20 during assembly, and reliability is improved.

  Furthermore, by inserting the circuit board 3 along the groove 24, it is possible to reduce the possibility that a large component such as the capacitor 1 other than the connector 14 contacts the case 20 and stress is applied to the soldered portion. High reliability can be obtained.

  Therefore, by forming the groove 24 in the shape shown in FIG. 6, the circuit board 3 can be easily inserted into the case 20 so that a large component does not come into contact with the case 20, so that reliability and yield can be obtained. Will improve.

  Next, a process of inserting the base portion 15 into the case 20 from the circuit board 3 side will be described.

  The base portion 15 to which the circuit board 3 is fixed is inserted while fitting both ends of the circuit board 3 into the grooves 24 of the case 20 as indicated by the straight arrows in FIG. At this time, since the base portion insertion port 23 side of the groove 24 has a height that is more than the thickness of the circuit board 3, the circuit board 3 can be easily inserted.

  When the base portion 15 is further inserted into the case 20, the height of the groove 24 is almost equal to the thickness of the circuit board 3 due to the taper forming portion 26, so that the circuit board 3 is accurately positioned. At the same time, the tip of the connector 14 protrudes from the connector hole 22.

  When the base portion 15 is inserted to the end of the case 20, the case fixing claw portion 21 provided at the tip of the elastic protrusion 17 is fitted into the locking portion 25 provided in the case 20 as indicated by the curved arrow in FIG. . Thereby, the base part 15 and the case 20 are firmly fixed. At this time, the left side of the circuit board 3 is in contact with the case inclined part 20b of the circuit board contact part 20a, and at the same time, the right side of the circuit board 3 (the mounting side of the capacitor 1) is also shown in FIG. It contacts the inclined portion 16c provided at the base of the circuit board fixing claw portion 16b. As a result, the circuit board 3 comes into contact with the inclined portion 16c at both ends of the right side and the case inclined portion 20b at the center of the left side, and a downward stress is applied to the circuit board 3. However, since the stress due to the inclined portion 16 c is received by the circuit board fixing protrusion 16 a and the stress due to the case inclined portion 20 b is received by the lower side of the groove 24, the circuit board 3 is firmly fixed inside the case 20. From these things, since the circuit board 3 can be fixed very easily and firmly, it does not resonate with respect to the vehicle vibration to the circuit board 3 or the like, and high reliability is obtained.

  In order to further secure the base portion 15 and the case 20, an adhesive may be applied to the gap between the base portion 15 and the case 20, the case fixing claw portion 21, the groove 24, the locking portion 25, and the like. . As a result, not only can it be firmly fixed, but also the dust-proof and moisture-proof effect of the part where the adhesive is applied can be obtained.

  In addition, the case fixing claw portion 21 has the same width as the elastic protrusion 17, but this may be configured such that the size of the case fixing claw portion 21 is smaller than that of the elastic protrusion 17 like the circuit board fixing claw portion 16 b. Thereby, since the clearance gap between the case fixing claw part 21 and the latching | locking part 25 is lose | eliminated, the dustproof effect is acquired similarly to the time of adhesive agent application. In addition, you may use an adhesive agent together with such a structure. In this case, dust resistance is ensured and a moisture proof effect is obtained, so that further improvement in reliability can be obtained.

  With the above structure, a highly reliable capacitor unit with a small and low profile can be realized.

  In the present embodiment, six capacitors 1 are used. However, it is sufficient to mount a necessary quantity according to the power specification of the vehicle on which the capacitor unit is mounted.

  Further, in the assembly method, a configuration in which the capacitor 1 is first inserted into the holding portion 5 and then the circuit board 3 is fixed to the base portion 15 is conceivable. In this case, a large number of lead wires 2 (in this embodiment) 12)) Since the circuit board 3 must be fixed to the base portion 15 while being simultaneously inserted into the lead wire hole 4, it becomes extremely difficult to assemble, and the lead wire 2 is inserted when the lead wire 2 is inserted into the lead wire hole 4. May be stressed. Therefore, as described in the present embodiment, the capacitor 1 is first positioned with respect to the circuit board 3 using the capacitor receiving jig 1a, and then the capacitor 1 is held without being moved by the capacitor rear holding jig 1b. The step of inserting into the portion 5 is essential.

  Furthermore, in the present embodiment, the capacitor 1 has been described as having a cylindrical shape, but the present invention is not limited thereto, and may be a prismatic shape or the like. In this case, the corresponding holding portion 5 may also have a cylindrical shape that matches the shape of the capacitor 1.

  Since the capacitor unit according to the present invention is mounted in the horizontal direction with respect to the circuit board, it is possible to reduce the size and height of the capacitor unit, and since no stress is applied to the lead wire during assembly, the capacitor unit has an extremely reliable configuration. In particular, it is useful as an emergency power source used in an electronic brake system for electrically braking a vehicle.

The partial exploded perspective view of the circuit board of the capacitor unit in an embodiment of the invention The base part after the capacitor holding | maintenance of the capacitor unit in embodiment of this invention, and partial sectional drawing of a circuit board It is an expansion perspective view of the circuit board fixing | fixed part of the other structure of the capacitor unit in embodiment of this invention, (a) The perspective view in case the cross section of a circuit board fixing protrusion is a triangle shape, (b) Screwing a circuit board Perspective view The perspective view after the internal assembly of the capacitor unit in embodiment of this invention 1 is an exploded perspective view of an entire capacitor unit according to an embodiment of the present invention. Sectional drawing of the case of the capacitor unit in embodiment of this invention Exploded perspective view of a conventional capacitor unit

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Capacitor 2 Lead wire 2a Bending part 3 Circuit board 3a Positioning recessed part 3b Circuit board fixing hole 4 Lead wire hole 5 Holding part 5a Elastic part 5c Base 5d Space 14 Connector 15 Base part 16 Circuit board fixing part 16a Circuit board fixing protrusion 16b Circuit Board fixing claw part 16c Inclined part 16e Positioning protrusion 17 Elastic protrusion 20 Case 20a Circuit board contact part 21 Case fixing claw part 22 Connector hole 23 Base part insertion port 24 Groove 25 Locking part 26 Taper forming part

Claims (19)

A plurality of capacitors;
A circuit board for connecting the capacitors in series, in parallel, or in series and parallel;
Provided on one end face of each capacitor, and the tip is bent so as to be perpendicular to the length direction of the capacitor so that the polarities are respectively in the same direction,
Two lead wires inserted into lead wire holes provided on the circuit board;
A cylindrical holding part for holding the tip side of the capacitor, and a base part integrally forming a circuit board fixing part for fixing the circuit board;
A case enclosing the circuit board,
The top side of the capacitor is held by the holding part, the circuit board is fixed to the circuit board fixing part, and the base part is connected to the circuit board side in a state where the circuit board and each lead wire are connected. A capacitor unit formed by being inserted into the case. The capacitor unit according to claim 1, wherein the holding portion has an elastic portion arranged along an outer periphery of the capacitor. The capacitor unit according to claim 1, wherein the holding portion has a shape in which a tip end side of the capacitor does not contact the base portion. The holding part is provided with a pedestal with which the tip side of the capacitor contacts,
The capacitor unit according to claim 3, wherein the base is provided with a hollow space. Positioning protrusions are integrally formed on the circuit board fixing part,
The circuit board is provided with a positioning recess at a position corresponding to the positioning protrusion,
The capacitor unit according to claim 1, wherein when the circuit board is fixed to the circuit board fixing portion, the positioning protrusion is fixed by a plurality of screws in a state where the positioning protrusion is inserted into the positioning recess. The circuit board fixing part is provided in a direction perpendicular to the base part,
At the tip of the circuit board fixing part,
So as to be arranged in the extension part of the length direction of the circuit board fixing part,
A circuit board fixing protrusion;
A circuit board fixing claw portion having elasticity at a position provided in the height direction with an interval substantially equal to the thickness of the circuit board from the circuit board fixing protrusion,
Is integrally formed,
The circuit board is provided with a circuit board fixing hole,
When fixing the circuit board to the circuit board fixing portion,
Inserting the circuit board between the circuit board fixing protrusion and the circuit board fixing claw portion,
The capacitor unit according to claim 1, wherein both of the circuit board fixing claws are fixed by fitting into the circuit board fixing hole. The capacitor unit according to claim 6, wherein an inclined portion that comes into contact with the circuit board is provided at a root portion of the circuit board fixing claw portion. The capacitor unit according to claim 6, wherein when the circuit board is inserted into the circuit board fixing portion, the circuit board fixing protrusion is disposed at a position not overlapping the circuit board fixing hole. The capacitor unit according to claim 6, wherein the circuit board fixing claw portion is disposed on an upper side of the circuit board and in the vicinity of an end portion of the circuit board. The capacitor unit according to claim 6, wherein the circuit board fixing protrusion is larger and / or larger than the circuit board fixing claw portion. The capacitor unit according to claim 6, wherein the circuit board fixing protrusion has a triangular cross section, and a positioning recess is provided at a position corresponding to the circuit board fixing protrusion of the circuit board. The capacitor unit according to claim 11, wherein a length of the positioning recess is shorter than a length of the circuit board fixing protrusion. The capacitor unit according to claim 1, wherein a bent portion is provided in a part of the lead wire in a direction perpendicular to the length direction of the capacitor. The base is formed with a plurality of elastic protrusions having a case fixing claw at the tip,
The case is formed with a plurality of locking portions slightly larger than the case fixing claw portion,
The capacitor unit according to claim 1, wherein the case fixing claw portion is fitted to the locking portion to fix the base portion by inserting the base portion into the case. At the end of the circuit board, on the extension in the length direction of the capacitor, the connector is mounted so that the terminal is in the direction of insertion into the case of the circuit board,
A connector hole larger than the outer dimension of the connector is provided on the surface facing the base portion insertion port of the case,
The capacitor unit according to claim 1, wherein grooves for inserting a circuit board are provided on the wall surfaces on both sides of the base portion insertion opening. The capacitor unit according to claim 15, wherein a tip of the groove has a shape with a narrow width. The capacitor unit according to claim 16, further comprising a tapered portion in the vicinity of the tip of one of the upper and lower sides of the groove. When the circuit board is inserted into the case,
The capacitor unit according to claim 1, wherein one side of the circuit board farthest from the base part abuts on a circuit board abutting portion provided in the case. The capacitor unit according to claim 18, wherein the circuit board is fixed by applying a stress in a direction perpendicular to a side contacting the circuit board contact portion.

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