JP2009232552A - Structure and member for fixing bus bar - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fixing structure and a fixing member of a bus bar which controls vibration while securing high insulation even in a limited small space. <P>SOLUTION: A structure for fixing a bus bar 34 to a conductive supporting member 3 comprises: a supporting member 3 having a pedestal portion 31 in which bolt holes are provided at intervals not overlapping the width of the bus bar, a nonconductive first member 10 having a wide portion 12 at a part in contact with the bus bar and provided with first bolt inserting portions 11 at substantially the same intervals as those of the bolt holes, and a nonconductive second member 20 having second bolt inserting portions 21 provided at substantially the same intervals as those of the bolt holes. The first member 10 is arranged in contact with the pedestal portion 31, the bus bar 34 is arranged in contact with the wide portion 12 of the first member, and the first member 10 and the second member 20 are tightened together to the supporting member 3 while the second member 20 is arranged opposite to the first member 10 via the bus bar 34. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a bus bar fixing structure and a bus bar fixing member for fixing a bus bar to a conductive support member.

  In recent years, for example, an inverter unit including an inverter for controlling a rotating electrical machine has been developed as a control unit for a rotating electrical machine (motor or generator) included in a drive device used in an electric vehicle, a hybrid vehicle, or the like. In such an inverter unit, the circuit components constituting the electric circuit are electrically connected by the bus bar. However, the bus bar is prevented from resonating due to vibrations generated during traveling of the vehicle, and the bus bar is damaged. In order to suppress occurrence of a short circuit with other metal parts, the bus bar is fixed at a position where the amplitude becomes large (see, for example, Patent Document 1 below).

  In the bus bar fixing structure described in Patent Document 1, a support leg for supporting the bus bar is provided on the lower plate of the main body, and the bus bar is supported by the support leg at a position where the amplitude becomes maximum when the bus bar swings. In this way, the vibration of the bus bar is suppressed, and the interference with members existing in the vicinity of the bus bar and the generation of abnormal noise are suppressed.

Japanese Patent Laid-Open No. 11-164449

  By the way, in recent years, the internal space of the inverter has been reduced along with the increase in functionality and size of the inverter. In the bus bar fixing structure described in Patent Document 1, if the bus bar is to be fixed in a narrow space in consideration of this point, it is necessary to reduce the height of the support legs. However, simply lowering the height of the support legs may cause a short circuit due to interference between the bolts for fixing the support legs to the lower body plate and the bus bar. Even if interference between the bolt and the bus bar can be avoided, there is a possibility that the metallic lower plate and the bus bar interfere with each other to cause a short circuit. Therefore, the bus bar fixing structure described in Patent Document 1 cannot be said to be a very suitable structure in terms of electrical insulation when fixing the bus bar in a narrow space.

  The present invention has been made in view of the above problems, and provides a bus bar fixing structure capable of suppressing vibration while ensuring high insulation even in a narrow space, and a bus bar fixing member therefor. With the goal.

  In order to achieve this object, the bus bar fixing structure for fixing a bus bar to a conductive support member according to the present invention is characterized by a pair of support members arranged at intervals not overlapping the width of the bus bar. A base portion provided with a bolt hole, and at least at a portion in contact with the bus bar, having a wide portion formed wider than the width of the base portion in the longitudinal direction of the bus bar, and the pair of bolt holes and Non-conductive first member having a pair of first bolt insertion portions provided at substantially the same interval and non-conductive having a pair of second bolt insertion portions provided at substantially the same interval as the pair of bolt holes A second member, wherein the first member is disposed in contact with the pedestal portion, the bus bar is disposed in contact with the wide portion of the first member, and the second member is disposed in the bus bar. Between The bolt inserted into the first bolt insertion portion and the second bolt insertion portion in a state of being arranged to face the first member is fastened to the bolt hole, and the first member and the second member Is that it is fastened together with the support member.

  According to said characteristic structure, since a bus bar is fixed to a supporting member on both sides of a bus bar with a 1st member and a 2nd member, it can suppress that a bus bar vibrates by the vibration from the outside etc. At that time, since the non-conductive first member is interposed between the pedestal portion and the bus bar, a short circuit between the support member including the pedestal portion and the bus bar is prevented. At this time, since the first member has a wide portion formed wider than the width of the pedestal portion in the longitudinal direction of the bus bar at least at a portion in contact with the bus bar, the pedestal portion is covered with the wide portion with a margin, A short circuit between the support member and the bus bar is more reliably prevented. Further, since the pair of bolt holes provided in the pedestal portion are arranged at intervals that do not overlap with the width of the bus bar, the bus bar can be clamped between the first member and the second member, and the support member can be fastened together. As a whole, the vertical distance from the surface on which the pedestal surface is provided can be kept short. Therefore, it is possible to provide a bus bar fixing structure capable of suppressing vibration while ensuring high insulation even in a narrow space.

  Here, it is preferable that a recess for accommodating the bus bar in the width direction is formed in at least one of the first member and the second member.

  According to this configuration, the bus bar is fixed so as to fit in the width direction in the recess formed in at least one of the first member and the second member, so that the bus bar is displaced in the width direction due to external vibration or the like. However, the deviation is regulated by the recess. Therefore, since the short circuit between each volt | bolt and a bus-bar is prevented, it can insulate more reliably.

  Here, the recess is set deeper than the thickness of the bus bar, and an elastic member is disposed between at least one of the first member and the second member and the bus bar, and the thickness of the bus bar and the elasticity of the bus bar. It is preferable that the sum of the thicknesses of the members is set larger than the depth of the recess.

  According to this configuration, since the sum of the thickness of the bus bar and the thickness of the buffer member is set to be larger than the depth of the recess, the bus bar is fixed to the support member with the bus bar sandwiched between the first member and the second member. At this time, the elastic member comes into contact with the bus bar in a state of being elastically deformed. Therefore, the bus bar can be more reliably fixed using the elastic force of the elastic member. Further, since the elastic member functions as a kind of cushioning material, it is possible to absorb vibration to some extent and suppress the displacement of the bus bar. Moreover, about the member by which an elastic member is arrange | positioned between bus bars among a 1st member and a 2nd member, since the said member does not carry out a plastic deformation at the time of fixation, it prevents a restraining force fall. Can do.

  Here, it is preferable that the first member has a restricting protrusion for restricting a mounting position with respect to the pedestal portion on a surface facing the pedestal portion.

  According to this configuration, since the attachment position of the first member to the pedestal portion is restricted by the restriction protrusion, positioning when attaching the first member to the pedestal portion is facilitated.

  Here, it is preferable that the restricting protrusion has an inclined surface that is inclined so that a protruding amount toward the pedestal portion increases toward the outer side in the width direction of the pedestal portion.

  According to this configuration, when the first member is attached to the pedestal portion, even if the first member is arranged slightly deviated from the pedestal portion, the first member is inclined to the inclined surface when a tightening force is applied. Since it slides along, a 1st member can be easily arrange | positioned in an appropriate position.

  Here, it is preferable that one of the first bolt insertion portion and the second bolt insertion portion has a fitting convex portion that is fitted to the other inner periphery.

  According to this configuration, the second member is opposed to the first member so that the fitting convex portion provided on one of the first bolt insertion portion and the second bolt insertion portion is fitted to the other inner periphery. Therefore, positioning when attaching the second member to the first member is facilitated. Moreover, since the bolt which fastens the first member and the second member together with the support member is covered by the fitting convex portion, a short circuit between the bolt and the bus bar is more reliably prevented.

  Here, a collar member made of a material harder than the fitting convex portion and having an axial length longer than the bolt axial length of the fitting convex portion is fitted to the inner periphery of the fitting convex portion. It is preferable that

  According to this configuration, when the bolt inserted into the first bolt insertion portion and the second bolt insertion portion is fastened to the bolt hole and the first member and the second member are fastened together with the support member, the clamping force is applied by the collar member. Can be supported. Therefore, the bus bar can be securely fixed, and the fastening force can be prevented from being lowered because the periphery of the bolt insertion portion does not undergo plastic deformation during fixation.

  Here, it is preferable that the first member and the second member are connected so as to be bendable at one end in the width direction of the bus bar.

  According to this configuration, since the first member and the second member are integrated, assembly work is facilitated.

  Here, it is preferable that the bus bar has a portion where a plurality of pieces overlap each other and a single portion, and the bus bar is fixed at the single portion.

  A portion where a plurality of bus bars overlap has high rigidity, so that even if vibration or the like is transmitted from the outside, there is little vibration. On the other hand, in the portion having only one bus bar, the amplitude tends to be large even when the same vibration is transmitted. According to this configuration, since the bus bar is fixed at a portion where only one bus bar is likely to vibrate, it is possible to more effectively suppress the bus bar from vibrating due to external vibration or the like.

  According to the present invention, the characteristic configuration of the bus bar fixing member for fixing the bus bar to the conductive support member having a pedestal portion provided with a pair of bolt holes is at least in a longitudinal direction of the bus bar at a portion in contact with the bus bar. A non-conductive first member having a wide portion formed wider than the width of the pedestal portion and having a pair of first bolt insertion portions provided at intervals not overlapping with the width of the bus bar, And a non-conductive second member having a pair of second bolt insertion portions provided at substantially the same interval as the first bolt insertion portion.

  According to this characteristic configuration, the bus bar can be fixed to the support member with the non-conductive first member and the second member sandwiched between the support member and the short circuit between the support member and the bus bar can be prevented. it can. At this time, since the first member has a wide portion formed wider than the width of the pedestal portion in the longitudinal direction of the bus bar at least at a portion in contact with the bus bar, if the first member is arranged and fixed on the support member side, the first member is wide. The pedestal portion can be covered with a margin with the portion, and a short circuit between the support member and the bus bar can be more reliably prevented. Furthermore, since the pair of first bolt insertion portions provided in the first member are arranged at intervals that do not overlap with the width of the bus bar, it is possible to tighten together while sandwiching the bus bar between the first member and the second member. It is possible to suppress the overall thickness when the bus bar is sandwiched between the first member and the second member. Therefore, it is possible to provide a bus bar fixing member for realizing a bus bar fixing structure capable of suppressing vibration while ensuring high insulation even in a narrow space.

[First embodiment]
Below, 1st embodiment of the bus-bar fixing structure which concerns on this invention is described with reference to drawings. In the present embodiment, as an example, a case where the present invention is applied to an inverter unit 1 that controls a motor and a generator included in a drive device for a hybrid vehicle will be described. FIG. 1 is an exploded perspective view of an inverter unit 1 to which a bus bar fixing structure according to the present invention is applied, and FIG. 2 is an exploded perspective view showing a mounting structure of a bus bar 34. 3 is a top view of the support bracket 3 to which the bus bar 34 is fixed, and FIG. 4 is a side view of the support bracket 3 to which the bus bar 34 is fixed. FIGS. 5A and 5B are perspective views showing the bus bar fixing member 5, in which FIG. 5A shows an overall image and FIG. 5B shows a state where the bus bar 34 is fixed. 6 is a front view of the bus bar fixing member 5 according to the present embodiment, FIG. 7 is a side view of the bus bar fixing member 5, and FIG. 8 is a rear view of the bus bar fixing member 5. FIG. 9 is a cross-sectional view in a state where the bus bar 34 is fixed to the bus bar fixing member 5.

1. First, the overall schematic structure of the inverter unit 1 will be described. As shown in FIG. 1, the inverter unit 1 includes a switching element module 41 that constitutes an inverter for driving (controlling) a motor and a generator, a control board 47 that controls the operation of the switching element module 41, and the like. A smoothing capacitor 43 for smoothing the power source, an inverter case 2 to which the switching element module 41 is fixed, and supported by the inverter case 2, a control board 47 is fixed to one surface (upper surface), and the other surface (lower surface). And the support bracket 3 to which the smoothing capacitor 43 is fixed.

  Further, the inverter unit 1 includes a boosting switching unit (not shown) including a boosting switching element integrally incorporated in the switching element module 41, and includes a boosting capacitor 45 and a reactor 42. Thus, a booster that boosts the power supply voltage is configured. The reactor 42 is fixed to the inverter case 2, and the boosting capacitor 45 is fixed to the support bracket 3. Further, the inverter unit 1 includes a noise filter 46 for removing power supply noise, and the noise filter 46 is fixed to the support bracket 3 adjacent to the boosting capacitor 45.

  Here, the inverter case 2 is made of a metal material such as aluminum and is manufactured by die casting or the like. A plurality of ribs are formed on the outer peripheral surface of the peripheral wall portion 52 in order to improve the heat dissipation of the inverter case 2 and to reduce the weight and the rigidity. A switching element module 41 and a reactor 42 are accommodated and fixed in the inverter case 2. The inverter case 2 is provided with a plurality of mounting attachment portions 51 for attaching the support bracket 3 along the inner peripheral surface of the peripheral wall portion 52, and the support bracket 3 is fastened and fixed to the mounting attachment portion 51. Is supported.

  As with the inverter case 2, the support bracket 3 is made of a metal material such as aluminum and is manufactured by die casting or the like. Therefore, the support bracket 3 has conductivity. The support bracket 3 has a box-shaped portion 53 that opens to the inverter case 2 side, and a smoothing capacitor 43 is accommodated and fixed inside the box-shaped portion 53. The smoothing capacitor 43 has a substantially rectangular parallelepiped shape, and includes a connection terminal 44 that protrudes to the outside in a state of being accommodated in the box-shaped portion 53. On the other hand, the control board 47 is fixed to the outer surface of the box-shaped portion 53 on the inverter cover 4 side. In addition, a boosting capacitor 45 and a noise filter 46 are fixed to the support bracket 3 adjacent to each other in this order from the box-shaped portion 53 side in which the smoothing capacitor 43 is accommodated. The support bracket 3 has a pedestal 31 (see FIG. 2) on the side wall 54. In the present embodiment, the support bracket 3 corresponds to a support member in the present invention.

  The switching element module 41, the reactor 42, the smoothing capacitor 43, the noise filter 46, and the like are electrically connected by a plurality of bus bars 34 that connect between predetermined terminals 55 of each component. In this example, the inverter unit 1 includes at least three bus bars 34 a, 34 b, 34 c on the side wall portion 54 of the support bracket 3, and each bus bar 34 a, 34 b, 34 c has a longitudinal direction that is the longitudinal direction of the support bracket 3. They are arranged to match. As shown in FIG. 2, the first bus bar 34 a is fastened with a bolt to the terminal 55 a of the switching element module 41 and the terminal 55 g of the reactor 42, and electrically connects the switching element module 41 and the reactor 42. The second bus bar 34b is fastened with bolts to the terminals 55b and 56c of the switching element module 41 (fastened together with the connection terminal 44 of the smoothing capacitor 43) and the terminal 55d of the noise filter 46, and the switching element module 41, the smoothing capacitor 43, and the noise The filter 46 is electrically connected. The third bus bar 34c is fastened to the terminal 55e of the noise filter 46 and the terminal 55f of the reactor 42 with bolts, and electrically connects the noise filter 46 and the reactor 42. Since the electric circuit constituted by these components and the like is the same as that constituting a general inverter, description thereof is omitted here. Note that the control board 47 and each part of the hybrid vehicle including the inverter unit 1 are also electrically connected by the cable 48.

  The inverter cover 4 is fixed to the upper end surface of the peripheral wall portion 52 of the inverter case 2. Thereby, each member fixed to the inverter case 2 and the support bracket 3 can be protected.

2. Next, the fixing position of the bus bar according to the present embodiment will be described. As shown in FIG. 2, the support bracket 3 has a pedestal 31 on the side wall 54. The pedestal 31 protrudes from the side wall 54 with a constant width over the entire height direction of the side wall 54 of the support bracket 3 (the direction from the inverter case 2 to the inverter cover 4, the vertical direction in FIG. 1). It is formed and has a mounting surface 31a for mounting a bus bar fixing member 5 described later. The pedestal 31 is provided with a pair of bolt holes 32. As will be described later, in the present embodiment, the first bus bar 34a is fixed by the bus bar fixing member 5, and the pair of bolt holes 32 are arranged at intervals that do not overlap at least the width of the first bus bar 34a. Here, “does not overlap with the width of the first bus bar 34a” means that the closest distance between the pair of bolt holes 32 is larger than the width of the first bus bar 34a.

  As shown in FIG. 1, in this embodiment, each of the bus bars 34 a, 34 b, 34 c is formed on the side wall portion 54 of the support bracket 3 from the vicinity of the central portion of the box-shaped portion 53 in which the smoothing capacitor 43 is accommodated to the vicinity of the noise filter 46. Are arranged along. Each bus bar 34a, 34b, 34c has a substantially flat plate shape, but has a gentle zigzag shape corresponding to the shape of the side walls so as to ensure a constant insulation distance with respect to the support bracket 3 and the inverter cover 4. (See FIG. 3). As described above, the first bus bar 34a connects the switching element module 41 and the reactor 42, the second bus bar 34b connects the switching element module 41, the smoothing capacitor 43, and the noise filter 46, and the third bus bar 34c connects the reactor 42. And the noise filter 46 are connected. Here, in this embodiment, the switching element module 41, the smoothing capacitor 43, the noise filter 46, and the reactor 42 are arranged in this order from the one end side in the longitudinal direction of the inverter unit 1 in plan view. Therefore, the lengths of the bus bars 34a, 34b, 34c in the longitudinal direction are different from each other. When the parts are connected to each other, as shown in FIG. 3 and FIG. Will exist. That is, the first bus bar 34a and the third bus bar 34c overlap from the terminal 55e to the terminal 55f, the first bus bar 34a and the second bus bar 34b overlap from the terminal 55b to the terminal 55d, and the terminal 55a to the terminal 55f. The first bus bar 34a is arranged by only one piece over 55b.

  Between the first bus bar 34a and the second bus bar 34b and between the first bus bar 34a and the third bus bar 34c, which overlap each other, insulating paper 35 having electrical insulation and moisture resistance is inserted. ing. The size of the insulating paper 35 to be inserted is set sufficiently larger than the size of the range where the bus bars 34 overlap each other. This prevents a short circuit from occurring between the overlapping bus bars 34. In addition, about the site | part with which the 1st bus-bar 34a and the 3rd bus-bar 34c have overlapped, since the distance between the 1st bus-bar 34a and the inverter cover 4 is comparatively close, electrical insulation between these is provided. In order to make it more reliable, the surface of the first bus bar 34 a on the inverter cover 4 side is also covered with the insulating paper 35. Similarly, since the distance between the second bus bar 34b and the support bracket 3 is relatively close to the portion where the first bus bar 34a and the second bus bar 34b are overlapped, electrical insulation between them is also possible. The surface of the second bus bar 34b on the side of the support bracket 3 is also covered with insulating paper 35 in order to ensure the reliability.

  Each bus bar 34a, 34b, 34c and the insulating paper 35 are bonded by a double-sided adhesive tape. Therefore, in a portion where a plurality of bus bars 34 overlap, each bus bar 34 is fixed to each other via the double-sided adhesive tape and the insulating paper 35. For this reason, since the bus bar 34 as a whole has a relatively high rigidity in the portion, even if vibrations or the like are transmitted from the outside, there is little vibration. On the other hand, in the part where only one bus bar 34 is present (the part from the terminal 55a to the part overlapping the second bus bar 34b of the first bus bar 34a in this example), when the same vibration or the like is transmitted from the outside. However, the amplitude tends to be large. Furthermore, in this example, among the portions from the terminal 55a of the first bus bar 34a to the portion overlapping the second bus bar 34b, the portions extending along the longitudinal direction of the support bracket 3 are the first bus bar 34a and the mutual portion thereof. Since the distance from the terminal 55a and the terminal 55b to which the second bus bar 34b bonded to the bolt is fastened by bolts is also increased, vibration is more likely to occur. Therefore, in order to effectively suppress this vibration, as shown in FIG. 4, the bus bar fixing member is provided at a portion where the number of the first bus bar 34 a is only one and the distance from the fastened and fixed position is long. The first bus bar 34 a is fixed to the support bracket 3 by 5.

3. Next, the configuration of the bus bar fixing member 5 will be described. As shown in FIGS. 5 to 8, the bus bar fixing member 5 includes a base member 10 and a cover member 20. As will be described in detail later, the first bus bar 34a is fixed by the bus bar fixing member 5 in a state where the first bus bar 34a is sandwiched between the base member 10 and the cover member 20 as shown in FIG. Done.

  The base member 10 is a non-conductive member having a pair of first bolt insertion portions 11 and a wide portion 12. The base member 10 corresponds to the first member in the present invention. The pair of first bolt insertion portions 11 are provided at intervals that do not overlap the width of the first bus bar 34a. Here, “does not overlap with the width of the first bus bar 34a” means that the closest distance between the pair of first bolt insertion portions 11 is larger than the width of the first bus bar 34a. When the first bus bar 34a is fixed, the first bus bar 34a is arranged such that the direction connecting the pair of first bolt insertion parts 11 and the longitudinal direction of the first bus bar 34a are substantially orthogonal between the pair of first bolt insertion parts 11. 34a is arranged. In the present embodiment, of the pair of first bolt insertion portions 11, one is a round insertion hole 11 a formed inside the base member 10, and the other is a U formed as part of the outer periphery of the base member 10. It becomes the character-shaped insertion part 11b. The wide portion 12 is formed such that at least a portion of the base member 10 that contacts the first bus bar 34a is wider than the width of the pedestal portion 31 in the longitudinal direction of the first bus bar 34a. That is, the base member 10 has a wide portion 12 that is wide in a direction orthogonal to the direction connecting the pair of first bolt insertion portions 11. The wide portion 12 in the present embodiment is further wide in the direction connecting the pair of first bolt insertion portions 11, and has a range that completely includes the range where the first bus bar 34a and the pedestal portion 31 overlap in plan view. It is formed to occupy. The base member 10 is formed in a flat plate shape having a certain thickness so that it can be inserted between the pedestal portion 31 and the first bus bar 34a when the bus bar fixing member 5 is attached, as will be described later. Has been.

  The cover member 20 is a non-conductive member having a second bolt insertion portion 21, a collar member 23, a concave portion 22, and an elastic member 24. The cover member 20 corresponds to the second member in the present invention. The pair of second bolt insertion portions 21 are provided at substantially the same interval as the pair of first bolt insertion portions 11. A collar member 23 is fitted to the inner periphery of the second bolt insertion portion 21. Here, the collar member 23 is formed of a material harder than the cover member 20. In this example, the material of the cover member 20 is resin as will be described later, whereas the material of the collar member 23 is metal, more specifically, carbon steel for machine structure. Further, the periphery of the second bolt insertion portion 21 is a fitting convex portion 25 protruding in the axial direction of the second bolt insertion portion 21 with respect to the reference surface 20 a of the cover member 20. The outer diameter of the fitting convex portion 25 is slightly smaller than the inner diameter of the first bolt insertion portion 11, and when the first bus bar 34 a is fixed, the fitting convex portion 25 is the first bolt insertion portion of the base member 10. 11 is fitted to the inner periphery. If it does in this way, positioning at the time of attaching cover member 20 to base member 10 will become easy. At this time, the center of the bolt hole 32 of the pedestal 31, the center of the first bolt insertion part 11, and the center of the second bolt insertion part 21 substantially coincide. Here, the axial length of the collar member 23 is longer than the length of the fitting convex portion 25 in the bolt axial direction. Thereby, when the first bus bar 34 a is fixed to the support bracket 3, the tightening force of the bolt 33 can be supported by the collar member 23. The outer periphery of the collar member 23 and the bolt 33 is covered with the fitting convex part 25, and the short circuit between these and the 1st bus bar 34a is prevented more reliably.

  The recess 22 is formed in the center of the cover member 20 in the direction connecting the pair of second bolt insertion portions 21 and accommodates the first bus bar 34a in the width direction. By providing such a recess 22, even if the first bus bar 34 a is shifted in the width direction due to external vibration or the like, the shift is regulated within the width of the recess 22. Therefore, the position shift of the first bus bar 34a is suppressed, and a short circuit between the pair of bolts 33 that fix the bus bar fixing member 5 to the support bracket 3 and the first bus bar 34a is effectively prevented. Here, the depth of the recess 22 is set deeper than the thickness of the first bus bar 34a. In addition, the elastic member 24 is bonded to the bottom surface 22a of the recess 22 with an adhesive, a double-sided adhesive tape, or the like, and the sum of the thickness of the first bus bar 34a and the thickness of the elastic member 24 is greater than the depth of the recess 22. It is set large. In this way, when the first bus bar 34a is fixed to the support bracket 3, the elastic member 24 comes into contact with the first bus bar 34a while being elastically deformed. Therefore, the first bus bar 34a can be more reliably fixed using the elastic force of the elastic member 24. Further, since the elastic member 24 functions as a kind of cushioning material, it is possible to absorb vibration to some extent and suppress the displacement of the first bus bar 34a. In addition, about the cover member 20 in which the elastic member 24 is arrange | positioned, since the plastic deformation is not carried out at the time of fixation of the 1st bus-bar 34a, the fall of a restraint force can also be prevented. As the material of the elastic member 24, rubber having heat resistance and moisture resistance, for example, butyl rubber, EPDM (ethylene-propylene-diene rubber), and the like are preferable. Among them, butyl rubber is more preferable because the cost can be kept low. Is preferred.

  In the present embodiment, guide ribs 26 are formed on the bottom surface 22 a of the recess 22 at both ends in the direction orthogonal to the direction connecting the pair of second bolt insertion portions 21. By providing such guide ribs 26, it is possible to facilitate positioning of the elastic member 24 at the time of manufacturing the bus bar fixing member 5, and after assembly, the cover member 20 and the elastic member 24 are temporarily caused by vibration from the outside. Even if the adhesiveness between them is lowered, the elastic member 24 can be prevented from falling off.

  The bus bar fixing member 5 in the present embodiment further includes a connecting portion 30 that connects the base member 10 and the cover member 20. By this connecting portion 30, the base member 10 and the cover member 20 are connected to one end in the width direction of the bus bar (in this example, the end on the round insertion hole 11 a side of the pair of first bolt insertion portions 11. ) Can be bent. The base member 10, the cover member 20, and the connecting portion 30 are integrally formed.

  The base member 10, the cover member 20, and the connecting portion 30 are preferably made of materials having excellent electrical insulation and heat resistance. Examples of the material satisfying such conditions include PA66 (polyamide 66), PBT-GF (glass fiber reinforced polybutylene terephthalate), and the like. In the present embodiment, since the base member 10, the cover member 20, and the connecting portion 30 are integrally formed and can be bent at the connecting portion 30, in addition to electrical insulation and heat resistance, it is also excellent in flexibility. It is more preferable to use a different material. From this point of view, PA66 (polyamide 66) is employed as the material of the bus bar fixing member 5 in this embodiment.

4). Bus Bar Fixing Procedure A procedure for fixing the bus bar 34 will be described.
First, the mounting bracket 51 of the inverter case 2 to which the switching element module 41 and the reactor 42 are fixed is mounted with the support bracket 3 to which the smoothing capacitor 43, the boosting capacitor 45 and the noise filter 46 are fixed, and is bolted. Fastened and fixed. The first bus bar 34a, the second bus bar 34b, and the third bus bar 34c that are bonded and integrated with each other via the insulating paper 35 and the double-sided adhesive tape are fastened to predetermined terminals 55 with bolts. At this time, the pedestal portion 31 provided in the support bracket 3 is located at the position where the first bus bar 34a is only one piece as described above, and the pair of bolt holes 32 provided in the pedestal portion 31 are provided. The connecting direction and the longitudinal direction of the first bus bar 34a are substantially orthogonal. The pedestal 31 and the first bus bar 34a are spaced apart by a certain distance.

  Next, the base member 10 of the bus bar fixing member 5 is inserted from the end surface 10c on the U-shaped insertion portion 11b side between the pedestal portion 31 and the first bus bar 34a, and is disposed in contact with the pedestal portion 31. The At this time, when the bus bar fixing member 5 is bent at the connecting portion 30, the outer surface comes into contact with the mounting surface 31 a of the pedestal portion 31. The base member 10 is disposed so that the first bus bar 34 a is in contact with the wide portion 12. The bus bar fixing member 5 is bent at the connecting portion 30, and the cover member 20 is disposed to face the base member 10 with the first bus bar 34a interposed therebetween. At this time, the elastic member 24 is disposed between the bottom surface 22a of the recess 22 of the cover member 20 and the first bus bar 34a. The first bolt insertion portion 11 of the base member 10 and the second bolt insertion portion 21 of the cover member 20 are provided at substantially the same interval, and the fitting convex portion 25 of the first bolt insertion portion 11 of the base member 10 is provided. The cover member 20 is positioned by being fitted to the inner periphery.

  Finally, the bolt 33 is inserted into the first bolt insertion portion 11 and the second bolt insertion portion 21, and the bolt 33 is fastened to the bolt hole 32 provided in the pedestal portion 31 of the support bracket 3. Thus, by fastening the base member 10 and the cover member 20 together with the pedestal 31 of the support bracket 3, the elastic member 24 comes into contact with the first bus bar 34a in an elastically deformed state, and the first bus bar 34a Fixed.

  As described above, according to the bus bar fixing structure as described above, the first bus bar 34a is fixed to the base 31 of the support bracket 3 with the base member 10 and the cover member 20 sandwiching the first bus bar 34a. It is possible to suppress the first bus bar 34a from vibrating due to vibrations and the like. At that time, since the non-conductive base member 10 is interposed between the pedestal portion 31 and the first bus bar 34a, the non-conductive base member 10 is interposed between the support bracket 3 provided with the pedestal portion 31 and the first bus bar 34a. Is prevented from short circuiting. At this time, since the base member 10 has the wide portion 12 that is formed wider than the width of the pedestal portion 31 in the longitudinal direction of the first bus bar 34a at a portion in contact with the first bus bar 34a, the pedestal portion 31 is wide with a margin. It will be covered with the part 12, and the short circuit between the support bracket 3 and the 1st bus-bar 34a is prevented more reliably. Further, since the pair of bolt holes 32 provided in the pedestal portion 31 are arranged at intervals that do not overlap with the width of the first bus bar 34 a, the first bus bar 34 a is sandwiched between the base member 10 and the cover member 20. The vertical distance from the surface on which the pedestal surface 31 of the support bracket 3 is provided can be shortened as a whole. At that time, the concave portion 22 formed in the cover member 20 suppresses the displacement of the first bus bar 34a in the width direction, and the fitting convex portion 25 covers the outer periphery of the bolt 33 and the collar member 23. And the first bus bar 34a are prevented from being short-circuited. Therefore, even in a narrow space, vibration can be suppressed while ensuring high insulation.

[Second Embodiment]
A second embodiment of the bus bar fixing structure according to the present invention will be described with reference to the drawings. FIG. 10 is a perspective view of the base member 10 of the bus bar fixing member 5 according to the present embodiment, and FIG. 11 is a perspective view of the base member 10 of FIG. 10 viewed from the opposite side. FIG. 12 is a cross-sectional view in a state where the bus bar 34 is fixed to the bus bar fixing member 5 according to the present embodiment. In the present embodiment, the specific configuration of the bus bar fixing member 5 is partially different from the first embodiment. Below, it demonstrates centering on difference with 1st embodiment.

5. Configuration of Bus Bar Fixing Member First, the bus bar fixing member 5 in the present embodiment does not have the connecting portion 30, and the base member 10 and the cover member 20 are configured as separate members. Accordingly, the material of the base member 10 is different from that of the first embodiment. That is, in this embodiment, since it is not necessary to bend these members, flexibility is not required. Therefore, the material of the base member 10 disposed between the first bus bar 34a and the pedestal portion 31 of the support bracket 3 is PBT-GF (glass fiber reinforced polybutylene terephthalate), which is particularly excellent in electrical insulation and heat resistance. Has been.

  Moreover, the base member 10 in this embodiment is formed so that the whole becomes wider than the width | variety of the base part 31 in the longitudinal direction of the 1st bus-bar 34a (refer FIG. 10). That is, the base member 10 is wide in the direction orthogonal to the direction connecting the pair of first bolt insertion portions 11 as a whole. In the present embodiment, as shown in FIG. 10, one of the pair of first bolt insertion portions 11 is a D-shaped insertion hole 11 c formed inside the base member 10, and the other is the base member 10. It becomes the C-shaped insertion part 11d formed as a part of the outer periphery of. As for the edge surfaces of both ends of the base member 10 in the direction connecting the pair of first bolt insertion portions 11, one (surface on the D-shaped insertion hole 11c side) is a round curved surface, and the other (C-shaped The surface on the insertion portion 11d side) is planar. In this way, when the base member 10 is disposed on the pedestal portion 31 of the support bracket 3, a planar surface is provided on a predetermined reference surface (for example, the mounting surface 31 a of the pedestal portion 31) provided on the support bracket 3 side. The vertical positioning can be easily performed by abutting on a vertical machining surface. Moreover, since the other side is a curved surface, reverse assembly in the vertical direction is prevented.

  In addition, as shown in FIG. 11, the base member 10 has a regulation protrusion 13 on a surface (contact surface 10 a) on the side that contacts and contacts the pedestal portion 31. The restricting protrusions 13 are provided at both end portions in the direction orthogonal to the direction connecting the pair of first bolt insertion portions 11 of the contact surface 10a. In the present embodiment, the vicinity of the center of the D-shaped insertion hole 11c, the vicinity of the center of the C-shaped insertion portion 11d, and the vicinity of these intermediate points (in the present example, a position near the C-shaped insertion portion 11d). ) Is provided with a total of three sets of six restricting projections 13. By having such a restriction protrusion 13, positioning when attaching the base member 10 to the pedestal portion 31 is facilitated. Here, the regulation protrusion 13 has the inclined surface 14 which inclines so that the protrusion amount to the base part 31 side may become large as it goes to the width direction outer side of the base part 31. As shown in FIG. By having such an inclined surface 14, when the base member 10 is attached to the pedestal portion 31, even when the base member 10 is arranged slightly deviated from the pedestal portion 31, the tightening force is applied. Since the base member 10 slides along the inclined surface 14, the base member 10 can be easily positioned at an appropriate position (in this example, the center of the bolt hole 32 of the base portion 31 and the center of the first bolt insertion portion 11 of the base member 10. Can be arranged at a position substantially coincident with. In this embodiment, three sets of six restricting projections 13 are formed, but the angle of the inclined surface becomes tighter from the D-shaped insertion hole 11c side toward the C-shaped insertion portion 11d side. (In other words, the restraining force on the pedestal 31 is loosened).

  Furthermore, as shown in FIG. 10, the base member 10 has a latching protrusion 15 on a surface (holding surface 10 b) on the side in contact with the first bus bar 34 a that is opposite to the contact surface 10 a. The latching protrusion 15 is formed on the D-shaped insertion hole 11c side of at least the portion of the clamping surface 10b that is in contact with the first bus bar 34a. As described above, when the bus bar fixing member 5 is fixed to the pedestal portion 31, the D-shaped insertion hole 11c side is the upper side of the support bracket 3 (the upper side in FIG. 1). By providing such a latching protrusion 15 and causing the latching protrusion 15 to be caught on the first bus bar 34a when the base member 10 is assembled, the base member 10 is prevented from sliding down, and the work efficiency in the assembling work Can be improved.

  The cover member 20 in the present embodiment has almost the same configuration as the cover member 20 in the first embodiment. However, in this embodiment, the cover part 20 is symmetrical in the direction connecting the pair of second bolt insertion parts 21. By doing in this way, when fixing the bus bar 34 using the bus bar fixing member 5, the cover member 20 can be arranged in any direction, so that the assembling work is facilitated and the workability can be improved. .

[Other Embodiments]
(1) In each of the above embodiments, the example in which the recess 22 is formed in the cover member 20 has been described. However, the recess 22 may be formed in the base member 10 as long as the bus bar 34 can be accommodated in the width direction.

(2) In each of the above embodiments, the example in which the elastic member 24 is disposed on the cover member 20 has been described. However, the elastic member 24 may be disposed on the base member 10, or the elastic member 24 may be disposed on both the base member 10 and the cover member 20.

(3) In each of the above embodiments, the example in which the elastic member 24 is disposed in the recess 22 has been described. However, the elastic member 24 is not always necessary. In the case where the elastic member 24 is not disposed, the depth of the recess 22 is set to be shallower than the thickness of the bus bar 34.

(4) In each of the above embodiments, the example in which the cover member 20 is provided with the fitting convex portion 25 and is fitted to the inner periphery of the first bolt insertion portion 11 of the base member 10 has been described. However, the fitting protrusion 25 may be provided on the base member 10. In this case, the inner periphery of the second bolt insertion portion 21 of the cover member 20 is fitted to the fitting convex portion 25.

(5) In each of the above-described embodiments, the example in which the bus bar 34 has a portion where a plurality of sheets overlap each other and only one portion and is fixed at only one portion has been described. However, the present invention can also be applied to the case where only one bus bar 34 is provided over the whole, and there is no problem even if a plurality of bus bars 34 are fixed at overlapping positions.

(6) In each of the embodiments described above, the example in which only the base member 10 in the second embodiment has the restricting protrusion 13 and the latching protrusion 15 has been described. However, the regulation protrusion 13 and the latching protrusion 15 may be formed also in the base member 10 in the first embodiment.

(7) In the above embodiments, as an example, the case where the present invention is applied to the inverter unit 1 that controls the motor and the generator included in the drive device for a hybrid vehicle and the bus bar 34 is fixed has been described. However, the object to which the present invention is applied is not limited to this, and can be applied to any device that needs to fix the bus bar.

  The present invention can be suitably used for an apparatus including a conductive support member and a bus bar.

1 is an exploded perspective view of an inverter unit to which a bus bar fixing structure according to the present invention is applied. Exploded perspective view showing the mounting structure of the bus bar Top view of the support bracket with the busbar fixed Side view of the support bracket with the busbar fixed A perspective view showing a bus bar fixing member Front view of the bus bar fixing member according to the first embodiment Side view of the bus bar fixing member according to the first embodiment Rear view of the bus bar fixing member according to the first embodiment Sectional drawing in the state by which the bus-bar was fixed to the bus-bar fixing member which concerns on 1st embodiment The perspective view of the base member of the bus-bar fixing member which concerns on 2nd embodiment. The perspective view which looked at the base member of FIG. 10 from the opposite side Sectional drawing in the state by which the bus-bar was fixed to the bus-bar fixing member which concerns on 2nd embodiment

Explanation of symbols

3 Support bracket (support member)
5 Busbar fixing member 10 Base member (first member)
11 First bolt insertion part 12 Wide part 13 Restriction protrusion 14 Inclined surface 20 Cover member (second member)
21 Second bolt insertion part 22 Recess 23 Color member 24 Elastic member 25 Fitting convex part 30 Connection part 31 Base part 32 Bolt hole 33 Bolt 34 Bus bar 34a First bus bar 34b Second bus bar 34c Third bus bar

Claims (10)

A bus bar fixing structure for fixing a bus bar to a conductive support member,
The support member has a pedestal portion provided with a pair of bolt holes arranged at intervals not overlapping with the width of the bus bar,
A pair of first bolt insertions having a wide portion formed wider than the width of the pedestal portion in the longitudinal direction of the bus bar at least at a portion in contact with the bus bar and provided at substantially the same interval as the pair of bolt holes A non-conductive first member having a portion;
A non-conductive second member having a pair of second bolt insertion portions provided at substantially the same interval as the pair of bolt holes,
The first member is disposed in contact with the pedestal, the bus bar is disposed in contact with the wide portion of the first member, and the second member is opposed to the first member across the bus bar. The bolts inserted into the first bolt insertion portion and the second bolt insertion portion are fastened to the bolt holes, and the first member and the second member are shared by the support member. Fastened busbar fixing structure.   The bus bar fixing structure according to claim 1, wherein a recess for accommodating the bus bar in the width direction is formed in at least one of the first member and the second member. The recess is set deeper than the thickness of the bus bar,
An elastic member is disposed between at least one of the first member and the second member and the bus bar,
The bus bar fixing structure according to claim 2, wherein the sum of the thickness of the bus bar and the thickness of the elastic member is set larger than the depth of the recess.   The bus bar fixing structure according to any one of claims 1 to 3, wherein the first member has a restricting protrusion for restricting an attachment position with respect to the pedestal portion on a surface facing the pedestal portion.   The bus bar fixing structure according to claim 4, wherein the restricting protrusion has an inclined surface that is inclined so that the amount of protrusion toward the pedestal portion increases toward the outer side in the width direction of the pedestal portion.   The bus bar fixing structure according to any one of claims 1 to 5, wherein one of the first bolt insertion portion and the second bolt insertion portion has a fitting convex portion that is fitted to the inner periphery of the other.   A collar member made of a material harder than the fitting convex portion and having an axial length longer than the bolt axial length of the fitting convex portion is fitted to the inner periphery of the fitting convex portion. The bus bar fixing structure according to claim 6.   The bus bar fixing structure according to any one of claims 1 to 7, wherein the first member and the second member are connected so as to be bendable at one end in the width direction of the bus bar. The bus bar has a part where a plurality of sheets overlap and a part of only one sheet,
The bus bar fixing structure according to any one of claims 1 to 8, wherein the bus bar is fixed at only one portion. A bus bar fixing member for fixing a bus bar to a conductive support member having a pedestal portion provided with a pair of bolt holes,
A pair of first bolt insertion portions provided at least at a portion in contact with the bus bar, having a wide portion formed wider than the width of the pedestal portion in the longitudinal direction of the bus bar, and provided at intervals not overlapping with the width of the bus bar A non-conductive first member having:
A non-conductive second member having a pair of second bolt insertion portions provided at substantially the same interval as the pair of first bolt insertion portions;
A bus bar fixing member.

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