JP5397355B2 - Vehicle power supply - Google Patents

Description

  The present invention relates to a vehicle power supply device such as a DC-DC converter or an alternator mounted on a vehicle.

For example, various vehicle power supply devices mounted on vehicles such as alternators in vehicles using an internal combustion engine as a power source or DC-DC converters in electric vehicles and hybrid vehicles have been developed.
In such a vehicle power supply device, a power supply unit that generates electric power is housed in a housing, and an output terminal for taking out an output from the power supply unit is fixed to the housing (see FIGS. 1 and 2 of Patent Document 1). FIG. 1 to FIG. 3 of Patent Document 2. Power is supplied to external devices such as batteries and auxiliary machines through this output terminal.
Therefore, a wire terminal (external connection terminal) in a wire connected to an external device is attached to the output terminal.

When the housing of the device to which the output terminal is attached is made of metal, an electrically insulating fixing member is used to assemble the output terminal to the housing while achieving electrical insulation between the output terminal and the housing. Is required. Therefore, there is a resin fixing member that is molded with respect to the output terminal.
Moreover, as a detent structure between terminals fixed by bolts and nuts, there are those disclosed in Patent Documents 3 and 4.

JP 2006-217739 A JP 2002-315397 A JP 2006-228682 A Japanese Patent Laid-Open No. 10-144365

However, in the output terminal of the vehicle alternator described in Patent Document 1, the portion constituting the current path is constituted by a plurality of members such as bolts, bushes, and bus bars. Therefore, the number of parts of the output terminal is large, the configuration is complicated, and the cost is increased.
Moreover, when connecting a wire terminal to an output terminal, there also exists a problem that a wire terminal will rotate centering | focusing on the axis | shaft of a volt | bolt.
In the output terminal of the vehicle alternator described in Patent Document 2, an opening is formed in a resin protective member that covers the output terminal. It is conceivable to engage a part of the wire terminal with this opening, but when a large load is applied to the small engaging portion, the protective member made of resin may be damaged.

Moreover, even if the anti-rotation structure described in the cited documents 3 and 4 is adopted, the following problems are not solved. That is, when the output terminal is provided with a fixing member provided for assembling the output terminal to the housing while providing insulation between the terminal body and the housing, the output terminal is not connected between the terminal body and the external connection terminal. If only the structures of the cited documents 3 and 4 are used for stopping, when a large load is applied, the terminal body rotates between the terminal body and the fixing member, and consequently the function of preventing rotation cannot be achieved.
In addition, when the fixing member is integrated with the terminal body, it is necessary to prevent water from entering between the fixing member and the terminal body in order to prevent water from entering the power supply device (inside the housing).

  The present invention has been made in view of such problems, has a small number of parts, is inexpensive, can prevent water from entering the housing, and reliably prevents rotation of the external connection terminal to be connected. It is an object of the present invention to provide a vehicular power supply device having an output terminal that can perform the above-described operation.

The present invention provides a power supply for a vehicle mounted on a vehicle, which includes a power supply section that generates power, a casing that covers the power supply section, and an output terminal that is fixed to the casing and extracts an output from the power supply section. A device,
The output terminal is connected to an external connection terminal for connecting to an external device to which power is supplied.
The output terminal is composed of a metal terminal body and a resin fixing member for fixing the output terminal to the housing.
The terminal body includes an inner contact portion connected to the power supply portion, an outer contact portion to which the external connection terminal is connected, and the fixing member interposed between the inner contact portion and the outer contact portion. It consists of an integral metal part with an intermediate part fixed to the outer periphery,
The outer contact portion has a detent portion that directly engages with the external connection terminal and restricts the external connection terminal from rotating with respect to the terminal body.
The intermediate portion has at least a part of a non-circular portion in which a cross-sectional outer shape orthogonal to the axial direction of the terminal body is non-circular, and the maximum diameter of the cross-sectional outer shape changes at a plurality of locations in the axial direction. A power supply device for a vehicle having a diameter changing portion (claim 1).

In the vehicle power supply device, the terminal body of the output terminal is made of an integral metal part. That is, the terminal body is not a combination of a plurality of metal parts from a connection part with the power supply part to a connection part with the external connection terminal, but a single metal such as one casting or one forging. It consists of parts.
Therefore, the number of parts constituting the terminal main body can be reduced, an inexpensive output terminal that can be easily manufactured can be obtained, and the cost of the vehicle power supply device can be reduced.

The terminal main body includes the rotation stopper. That is, the detent portion is also integrated as a part of the terminal body. Therefore, in order to restrict the rotation of the external connection terminal, it is not necessary to form the anti-rotation portion again on the output terminal. Therefore, the cost of the output terminal can be reduced.
In addition, since the rotation preventing portion is provided on the terminal main body made of a metal component, there is no possibility that the rotation preventing portion is damaged even when a load is applied from the external connection terminal to be engaged. Therefore, it is possible to reliably prevent the external connection terminal from rotating.

Further, the output terminal includes the terminal body and the fixing member. And the said intermediate part of the terminal main body which fixes a fixing member to outer periphery has the said non-circular part. Therefore, it has a structure that prevents relative rotation between the terminal body and the fixing member in terms of the rotational direction around the axial direction. Therefore, even if a large load is applied to the external connection terminal engaged with the rotation preventing portion of the terminal body in the rotation direction, the rotation between the terminal body and the fixing member can be reliably prevented.
That is, rotation of the external connection terminal with respect to the housing can be reliably prevented by the anti-rotation portion formed on the terminal body and the non-circular portion of the intermediate portion of the terminal body.

  Moreover, the intermediate part of a terminal main body has a diameter change part from which the maximum diameter of the said cross-sectional external shape changes in several places of an axial direction. Therefore, the joint surface between the intermediate portion and the fixing member is not linear but has a complicated shape from the outer contact portion toward the inner contact portion. That is, the area of the joint surface is increased, and the path from the outer contact portion to the inner contact portion along the joint surface is increased. Therefore, even if water enters between the terminal body and the fixing member from the outer contact portion, it is possible to prevent water from reaching the inner contact portion. That is, water can be effectively prevented from entering the housing.

  As described above, according to the present invention, an output terminal that has a small number of components, is inexpensive, can prevent water from entering the housing, and can reliably prevent rotation of the external connection terminal to be connected. The power supply device for vehicles which has can be provided.

The perspective view of the output terminal in Example 1, and the wire terminal connected to it. FIG. 3 is a perspective view of an output terminal in the first embodiment. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. B view of FIG. C view of FIG. The DD sectional view taken on the line of FIG. The perspective view of the terminal main body in Example 1. FIG. FIG. 6 is another perspective view of the terminal body in the first embodiment. BRIEF DESCRIPTION OF THE DRAWINGS Sectional explanatory drawing of the power supply device for vehicles in Example 1. FIG. The perspective view of the output terminal in Example 2, and the wire terminal connected to it. The perspective view of the output terminal in Example 3, and the wire terminal connected to it. The perspective view of the output terminal in Example 4, and the wire terminal connected to it. FIG. 10 is a perspective view of an output terminal in Embodiment 5. The perspective view of the output terminal in Example 6, and the wire terminal connected to it. The perspective view of the output terminal in Example 7, and the bus bar connected to it. The perspective view of the terminal main body in Example 8. FIG. The side view of the terminal body in Example 8. FIG. 17 is a cross-sectional view taken along line EE in FIG. 16. The top view of the terminal main body in Example 8. FIG. FIG. 17 is a sectional view taken along line F-F in FIG. 16. G view of FIG. The H view of FIG. Sectional drawing of the output terminal in Example 8. FIG. FIG. 24 is a cross-sectional view corresponding to a cross-section taken along the line II of FIG. Sectional drawing of the output terminal in Example 9. FIG. FIG. Explanatory drawing of the output terminal and stud bolt in Example 10. FIG. Explanatory drawing of the output terminal and nut which fixed the stud bolt in Example 10. FIG.

In the present invention, the terminal body is preferably formed by casting such as die casting or forging. In particular, the terminal body is preferably an aluminum die-cast product from the viewpoints of formability, strength, electrical resistance, and light weight, but other metals such as copper may be used.
The maximum diameter means a dimension in a direction in which the outer dimension is the largest in the cross-sectional outer shape. The same applies to the following. When the cross-sectional outer shape is a circle, the diameter matches the maximum diameter.

Moreover, it is preferable that the said intermediate part has a collar part whose diameter is larger than the maximum diameter of the both sides of the said axial direction (Claim 2).
In this case, the area of the joint surface between the intermediate portion and the fixing member can be effectively increased, and the path from the outer contact portion to the inner contact portion along the joint surface is effectively lengthened. can do. Therefore, it is possible to effectively prevent water from entering the housing and to increase the bonding strength between the intermediate portion and the fixing member.

Moreover, it is preferable that the said intermediate part has a large diameter collar part which has a diameter larger than the maximum diameter of the said outside contact part as said collar part (Claim 3).
In this case, water can be effectively prevented from entering the housing, and the bonding strength between the intermediate portion and the fixing member can be increased.

Moreover, it is preferable that the circumferential groove part formed in the circumferential direction is formed between the said collar part formed in the position nearest to the said outside contact part among the said collar parts, and the said outer contact part. (Claim 4).
In this case, it is possible to effectively prevent water from entering at the entrance of the water intrusion path outside the housing.

Moreover, it is preferable that the said terminal main body has the end surface groove part formed in the circumferential direction at the outer peripheral end surface of the said collar part.
In this case, it is possible to increase the area of the joint surface between the intermediate portion and the fixing member on the outer peripheral end surface having a large diameter and to complicate the water intrusion path. Therefore, it is possible to efficiently increase the bonding strength between the terminal body and the fixing member and prevent water from entering.

Moreover, it is preferable that the said terminal main body forms the radial rib extended radially in the radial direction on the surface of the said collar part.
In this case, the joint strength between the intermediate part and the fixing member can be increased by increasing the joint area between the intermediate part and the fixing member. Moreover, the rotation prevention between a terminal main body and a fixing member can be performed effectively.

Moreover, it is preferable that the said intermediate part has two or more outer periphery recessed parts formed in the area | region used as a part of full length while being a part of the perimeter in the outer peripheral surface.
In this case, the joint strength between the intermediate part and the fixing member can be increased by increasing the joint area between the intermediate part and the fixing member. Moreover, the rotation prevention between a terminal main body and a fixing member can be performed effectively. Furthermore, since the water intrusion path between the intermediate portion and the fixing member can be complicated, water intrusion into the housing can be effectively prevented.

The fixing member includes a flange portion that is in contact with an outer surface of the housing, and a cylindrical portion that extends from the flange portion toward the inner contact portion side and is inserted into a mounting hole provided in the housing. (Claim 8).
In this case, the output terminal can be easily and stably fixed to the housing.

The cylindrical portion includes an inner extending portion that extends so as to cover a part of the inner contact portion from the outer peripheral side, and a circumferential shape is provided between the inner extending portion and the inner contact portion. It is preferable that a space is formed (claim 9).
In this case, the creeping distance between the inner contact portion and the housing can be increased, and the insulation resistance between the terminal body and the housing can be further increased.

The circumferential space is preferably filled with a resin sealing member.
In this case, even if water enters between the intermediate portion and the fixing member, the sealing member can prevent water from entering the housing.

Moreover, it is preferable that the said intermediate part has the large diameter collar part which has a larger diameter than the said outside contact part as said collar part, and the said flange part is formed in the outer periphery of the said large diameter collar part. (Claim 11).
In this case, the enlargement of the area of the joint surface between the terminal body and the fixing member and the extension of the water intrusion path can be realized while preventing the output terminal from becoming large. As a result, water can be effectively prevented from entering, and a compact output terminal having a high bonding strength between the terminal body and the fixing member can be obtained. That is, since the flange portion needs to have a large diameter for assembly with the housing, the output terminal can be increased in size by arranging a large-diameter flange on the portion where the flange portion having the large diameter is formed. Without inviting, it is possible to improve the effect of preventing the ingress of water and the bonding strength between the terminal body and the fixing member. That is, it is not necessary to increase the size of the output terminal in order to provide the large-diameter flange.

Further, it is preferable that the flange portion includes a positioning portion that engages with an outer surface of the housing.
In this case, the output terminal can be easily and accurately positioned and fixed with respect to the housing.

Moreover, it is preferable that the cross-sectional external shape of the adjacent part with the said outside contact part in the said intermediate part is the same as the said outside contact part (Claim 13).
In this case, the anti-rotation part provided in the outer contact part and at least a part of the non-circular part in the intermediate part can be continuously formed. That is, at least a part of the non-circular portion can be easily formed in a portion adjacent to the outer contact portion in the intermediate portion.

Preferably, the terminal body is formed with a screw hole, and the external connection terminal is fixed between the terminal body and a bolt that is screwed into the screw hole. 14).
In this case, the external connection terminal can be easily and reliably attached to the output terminal. Moreover, it becomes easy to produce the said terminal main body as an integral metal component.

Moreover, it is preferable that the said terminal main body forms the said screw hole in the said axial direction ranging from the said outside contact part to the said intermediate part (Claim 15).
In this case, the fastening strength between the output terminal and the bolt can be increased without increasing the size of the terminal body. That is, in order to sufficiently secure the bonding strength between the terminal body and the fixing member, it is necessary to increase the area of the bonding surface between them to some extent, and for this reason, the diameter of the intermediate portion is a certain size. is necessary. If it does so, the area | region for forming the said screw hole will be ensured by a certain amount inside the intermediate part. Therefore, even if the screw hole is formed up to the middle part, the diameter of the middle part does not increase just because of the screw hole, so the fastening strength between the output terminal and the bolt is not increased without increasing the size of the terminal body. Can be increased. Since the inner contact portion does not have a role of joining to the fixing member, the size of the output terminal can be prevented from increasing by forming the screw hole formation region up to the intermediate portion in front of it.

Preferably, the output terminal includes the inner contact portion, the intermediate portion, and the outer contact portion arranged in a straight line along a direction in which the screw holes are formed.
In this case, the structure of the output terminal can be simplified.

The vehicle power supply device is preferably a DC-DC converter for stepping down or stepping up DC power.
In this case, in particular, since a large current flows to the output terminal, according to the present invention in which the terminal body is constituted by an integral metal part, there is an advantage that heat generation at the output terminal can be easily suppressed.

Example 1
A vehicle power supply device according to an embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 9, the vehicle power supply device 1 of the present example includes a power supply unit 2 that generates electric power, a housing 3 that covers the power supply unit, and is fixed to the housing 3 and output from the power supply unit 2. And an output terminal 4 for taking out. The vehicle power supply device 1 is mounted on a vehicle.

As shown in FIGS. 1 and 9, the output terminal 4 is connected to an external connection terminal for connecting to an external device to which power is supplied. In this example, the external connection terminal is the wire terminal 5 provided at the tip of the wire 50.
As shown in FIGS. 3, 7, and 8, the output terminal 4 includes a terminal body 40 that forms a current path from the connection portion to the power supply portion 2 to the connection portion to the wire terminal 5, and is formed of an integral metal part. .
As shown in FIG. 1, the terminal body 40 is directly engaged with the wire terminal 5 to prevent the wire terminal 5 from rotating with respect to the terminal body 40 (FIG. 2, FIG. 4, FIG. 5). 7 and FIG. 8).

  The vehicle power supply device 1 of this example is a DC-DC converter for stepping down DC power. That is, in order to charge an auxiliary battery (not shown) for operating an auxiliary machine from a high voltage battery (not shown) in an electric vehicle or a hybrid vehicle, for example, an auxiliary machine of 12V from a high voltage battery voltage of 300V Step down DC power to battery voltage. Accordingly, the wire 50 connected to the output terminal 4 is connected to the auxiliary battery.

  As shown in FIGS. 3, 7, and 8, the terminal main body 40 includes an inner contact portion 42 that is connected to the power supply unit 2 and an outer contact portion 43 that is connected to the wire terminal 5. The inner contact portion 42 has a substantially rectangular parallelepiped shape and has a through hole 421 that penetrates in the thickness direction. On the other hand, the outer contact portion 43 has a planar end surface, and a screw hole 431 is formed in the axial direction from the end surface. As shown in FIG. 1, the wire terminal 5 is fixed between the bolt 6 screwed into the screw hole 431 and the terminal body 40.

  As shown in FIGS. 1 to 5, the output terminal 4 includes a fixing member 400 that is a clothing portion made of an insulator that partially covers the terminal body 40. That is, the fixing member 400 is formed around the terminal body 40 at the intermediate portion 44 that is a portion between the inner contact portion 42 and the outer contact portion 43 of the terminal body 40 so as to be exposed. The intermediate portion 44 has at least a part of a non-circular portion whose non-circular cross-sectional outline perpendicular to the axial direction of the terminal body 40, and a diameter change in which the maximum diameter of the cross-sectional outline changes at a plurality of axial positions. Part.

  The fixing member 400 is configured by a resin molded body. Further, as shown in FIG. 9, the fixing member 400 is formed with a flange portion 401 for fixing the output terminal 4 to the housing 3. As shown in FIGS. 4 and 6, the fixing portion 402 that penetrates in the axial direction of the terminal body 40 is formed in the flange portion 401. Around the fixing hole 402, an annular bush 403 made of a metal such as aluminum is insert-molded into the fixing member 400. The bush 403 is electrically insulated from the terminal body 40.

Further, the terminal main body 40 is formed by die casting, particularly, in this example, is formed by aluminum die casting.
As shown in FIG. 2, FIG. 4, FIG. 7, and FIG. 8, the rotation preventing portion 41 is configured by a flat portion provided on the outer peripheral surface of the outer contact portion 43. The flat portion (rotating stop portion 41) is formed in parallel with each other at two locations on the outer peripheral surface of the outer contact portion 43.

  As shown in FIG. 1, the wire terminal 5 is directly engaged with the detent 41. The wire terminal 5 includes a contact portion 51 provided with an opening through which the bolt 6 is inserted, and a sandwiching portion 52 that sandwiches the wire 50. The wire terminal 5 has a detent pawl 53 formed in a substantially vertical direction from the contact portion 51.

  The wire terminal 5 is fixed to the output terminal 4 in a state where the contact portion 51 is brought into contact with the end face of the terminal main body 40 and the rotation-preventing claw 53 is disposed opposite to the rotation-preventing portion 41 of the terminal main body 40. Is done. That is, in this state, the bolt 6 is inserted into the opening provided in the contact portion 51 of the wire terminal 5 and is screwed into the screw hole 431 in the terminal body 40, thereby fastening the wire terminal 5 to the output terminal 4. .

Next, the function and effect of this example will be described.
In the vehicle power supply device 1, the terminal body 40 of the output terminal 4 is made of an integral metal part (aluminum die-cast product). That is, the terminal main body 40 is not a combination of a plurality of metal parts from a connection part (inner contact part 42) to the power supply part 2 to a connection part (outer contact part 43) to the wire terminal 5, but a single cast product ( Die-cast product), that is, a single metal part.
Therefore, the number of parts constituting the terminal main body 40 can be reduced, and the inexpensive output terminal 4 that can be easily manufactured can be obtained. As a result, the cost of the vehicle power supply device 1 can be reduced.

Further, the terminal body 40 includes a detent portion 41. That is, the rotation preventing portion 41 is also integrated as a part of the terminal body 40. Therefore, in order to restrict the rotation of the wire terminal 5, it is not necessary to form the rotation stopper 41 on the output terminal 4 again. Therefore, the cost of the output terminal 4 can be reduced.
Moreover, since the rotation prevention part 41 will be provided in the terminal main body 40 which consists of metal parts, even if the load from the wire terminal 5 engaged is applied, there exists a possibility of producing malfunctions, such as the rotation prevention part 41 being damaged. Absent. Therefore, the wire terminal 5 can be reliably prevented from rotating.

  The vehicle power supply device 1 is a DC-DC converter. In particular, since a large current flows to the output terminal 4, according to the present invention in which the terminal body 40 is configured by an integral metal part, the heat generation at the output terminal 4 is generated. There is an advantage that it is easy to suppress.

  The terminal body 40 is formed with a screw hole 431, and the wire terminal 5 is fixed between the terminal body 40 and the bolt 6 screwed into the screw hole 431. Thereby, the wire terminal 5 can be attached to the output terminal 4 easily and reliably. Moreover, it becomes easy to produce the terminal body 40 as an integral metal part.

  As described above, according to this example, it is possible to provide a vehicle power supply device having an output terminal that has a small number of components, is inexpensive, and can reliably prevent rotation of a wire terminal to be connected.

(Example 2)
In this example, as shown in FIG. 10, the configuration of the rotation preventing portion 41 provided on the output terminal 4 is changed.
That is, the rotation prevention part 41 in the output terminal 4 of the vehicle power supply device 1 of the present example is formed of a protrusion that protrudes from the output terminal 4. By inserting the protrusion-shaped detent 41 into an engagement hole 54 provided in the wire terminal 5, the rotation of the wire terminal 5 with respect to the output terminal 4 is restricted.
In addition, the rotation prevention part 41 of this example is also integrally formed with the terminal main body 40.
Further, a pair of rotation stoppers 41 are formed at positions opposite to each other with a screw hole into which the bolt 6 is screwed.
Others are the same as in the first embodiment.
In the case of this example, the same effects as those of the first embodiment are obtained.

(Example 3)
In this example, as shown in FIG. 11, two engagement holes 54 are provided in the wire terminal 5, and two projecting detents 41 are engaged with the two engagement holes. is there.
Others are the same as in the second embodiment.
FIG. 11 shows a state before the bolt is screwed into the screw hole 431 of the output terminal 4.

In the case of this example, before attaching the bolt 6, the wire terminal 5 can be positioned with respect to the output terminal 4 by engaging the rotation stopper 41 with each of the two engagement holes 54. Therefore, the work of fixing the wire terminal 5 to the output terminal 4 can be performed more easily and efficiently.
In addition, the same effects as those of the second embodiment are obtained.

Example 4
In this example, as shown in FIG. 12, an external thread portion 432 is formed on the output terminal 4.
The male screw portion 432 is integrally formed with the terminal body 40.
In this case, the male screw part 432 is inserted into the wire terminal 5, and the nut 61 is screwed into the male screw part 432, thereby fastening the wire terminal 5 to the output terminal 4.
Further, the output terminal 4 is formed with a protrusion-shaped detent 41 integrally formed with the terminal body 40, and the detent 41 is inserted into an engagement hole 54 provided in the wire terminal 5. The Thereby, the rotation of the wire terminal 5 with respect to the output terminal 4 is restricted.
Others are the same as in the first embodiment.
In the case of this example, the same effects as those of the first embodiment are obtained.

(Example 5)
In this example, as shown in FIG. 13, a concave detent 41 is provided on the end surface of the outer contact 43 in the terminal body 40 of the output terminal 4.
A pair of anti-rotation portions 41 are formed on both sides of the screw hole 431, and each has a rectangular shape in plan view.
The wire terminal 5 is fixed to the output terminal 4 in a state where a pair of non-rotating claws (not shown) provided on the wire terminal 5 is engaged with the concave rotation-preventing portion 41.
Others are the same as in the first embodiment.
In the case of this example, the same effects as those of the first embodiment are obtained.

(Example 6)
In this example, as shown in FIG. 14, a hexagonal columnar detent 41 is provided on the end face of the outer contact 43 in the terminal body 40 of the output terminal 4.
A screw hole 431 is formed inside the rotation stopper 41.
Then, the opening 55 of the wire terminal 5 is formed in a hexagonal shape, and the wire terminal 5 is fixed to the output terminal 4 in a state where the rotation stopper 41 is inserted into the opening 55.
Others are the same as in the first embodiment.
In the case of this example, the same effects as those of the first embodiment are obtained.

(Example 7)
In this example, as shown in FIG. 15, the bus bar 5 b is used as an external connection terminal connected to the output terminal 4.
The bus bar 5b is made of a metal plate such as copper and has the other end connected to an external device to which power is supplied.
Further, the bus bar 5 b is also provided with a non-rotating claw 53, and the non-rotating claw 53 is engaged with a detent portion 41 provided on the outer contact portion 43 of the output terminal 4.
Others are the same as in the first embodiment.
In the case of this example, the same effects as those of the first embodiment are obtained.

(Example 8)
In this example, as shown in FIGS. 16 to 24, the shape of the output terminal 4, particularly the shape of the terminal body 40, is shown more specifically.
As shown in FIGS. 23 and 24, the output terminal 4 includes a metal terminal main body 40 and a resin fixing member for fixing the output terminal 4 to the housing 3 (see FIG. 9) of the vehicle power supply device 1. 400.

As shown in FIGS. 16 to 20, 23, and 24, the terminal body 40 includes an inner contact portion 42 connected to the power supply unit 2, and an outer contact portion 43 to which an external connection terminal (wire terminal 5) is connected. And an intermediate metal part provided with an intermediate part 44 which is interposed between the inner contact part 42 and the outer contact part 43 and fixes the fixing member 400 to the outer periphery.
As shown in FIG. 20, in the terminal body 40, the intermediate portion 44 corresponds to a portion where the fixing member 400 is fixed to the outer peripheral surface, that is, a portion where the fixing member 400 contacts, and is formed on both sides in the axial direction. These portions are the inner contact portion 42 and the outer contact portion 43, respectively.

The outer contact portion 43 has a rotation preventing portion 41 that directly engages with the external connection terminal and restricts the external connection terminal from rotating with respect to the terminal body 40.
The intermediate portion 44 has at least a part of a non-circular portion whose non-circular cross-sectional outline perpendicular to the axial direction of the terminal body 40, and a diameter change in which the maximum diameter of the cross-sectional outline changes at a plurality of axial positions. Part.

  The intermediate portion 44 has two flange portions (a large diameter flange portion 45 and a small diameter flange portion 450) having a diameter larger than the maximum diameter of both side portions in the axial direction. As shown in FIGS. 21 and 22, the large-diameter collar portion 45 and the small-diameter collar portion 450 both have a circular outer shape as viewed from the axial direction. The large diameter flange 45 has a diameter larger than the maximum diameter of the outer contact portion 43. The small diameter flange 450 has a smaller diameter than the large diameter flange 45 and a larger diameter than the maximum diameter of the inner contact portion 42. The small diameter flange portion 450 is formed on the side close to the inner contact portion 42 in the intermediate portion 44, and the large diameter flange portion 45 is formed on the side close to the outer contact portion 43 in the intermediate portion 44.

  A circumferential groove 46 formed in the circumferential direction is formed between the large diameter flange 45 and the outer contact portion 43. Further, the terminal body 40 has an end surface groove portion 451 formed in the circumferential direction on the outer peripheral end surface of the large diameter flange 45. Further, the terminal body 40 is formed by forming a plurality of radial ribs 452 extending radially in the radial direction on the surface of the large-diameter flange 45. The radial ribs 452 are formed on the surface on the inner contact portion 42 side in the large-diameter flange portion 45.

As shown in FIGS. 16, 17, and 19, the intermediate portion 44 has a plurality of outer peripheral recesses 441 formed in a region that is a part of the entire outer periphery and a part of the entire length. The outer peripheral recesses 441 are formed in alignment with each other in an axial direction, two in the axial direction and four in the circumferential direction.
Further, the intermediate portion 44 is formed with a flat surface portion 442 that is parallel to the plane that constitutes the anti-rotation portion 41 in the outer contact portion 43.

As shown in FIGS. 23 and 24, the fixing member 400 includes a flange portion 401 that contacts the outer surface of the housing 3, and extends from the flange portion 401 toward the inner contact portion 42 and is provided in the housing 3. And a cylindrical portion 404 to be inserted into the mounting hole.
The tubular portion 404 includes an inner extending portion 405 extending so as to cover a part of the inner contact portion 42 from the outer peripheral side, and a circumferential shape is provided between the inner extending portion 405 and the inner contact portion 42. A space 406 is formed. Further, a constricted portion 422 narrowed inward is formed in a part of the inner contact portion 42 adjacent to the intermediate portion 44 and facing the circumferential space 406.

  The flange portion 401 is formed on the outer periphery of the large diameter flange portion 45 in the terminal body 40. The flange portion 401 includes a positioning portion 407 that engages with the outer surface of the housing 3. That is, the positioning portion 407 protrudes in the axial direction from the flange portion 401 and engages with a recess provided at a predetermined position on the outer surface of the housing 3, thereby positioning the output terminal 4 with respect to the housing 3. And prevents rotation.

An adjacent portion 443 of the intermediate portion 44 adjacent to the outer contact portion 43 has the same cross-sectional outline as the outer contact portion 43.
The non-circular portion in the intermediate portion 44 is configured at an axial position where, for example, the outer peripheral concave portion 441, the flat surface portion 442, the radial rib 452, the peripheral groove portion 46, and the adjacent portion 443 are formed. That is, since the outer peripheral recess 441, the flat surface portion 442, and the radial rib 452 are formed in a part of the intermediate portion 44 in the circumferential direction, the cross-sectional outer shape of those portions becomes non-circular, and the circumferential groove portion 46 and the adjacent portion 443 are formed. By making the cross-sectional outer shape noncircular, a noncircular portion can be formed also in this portion.
Further, the diameter changing portion in the intermediate portion 44 is constituted by, for example, a large diameter flange portion 45, a small diameter flange portion 450, a circumferential groove portion 46, an end surface groove portion 451, and an outer peripheral recess portion 441.

A screw hole 431 is formed in the terminal main body 40, and an external connection terminal (wire terminal 5) is fixed between the bolt 6 screwed into the screw hole 431 and the terminal main body 40 ( (See FIG. 1). As shown in FIGS. 23 and 24, the screw hole 431 is formed in the axial direction from the outer contact portion 43 to the intermediate portion 44. Specifically, the screw hole 431 is formed up to an axial position that becomes a boundary portion between the intermediate portion 44 and the inner contact portion 42.
The output terminal 4 is formed by arranging an inner contact portion 42, an intermediate portion 44, and an outer contact portion 43 on a straight line along the direction in which the screw hole 431 is formed.
Others are the same as in the first embodiment.

Next, the function and effect of this example will be described.
The output terminal 4 includes a terminal main body 40 and a fixing member 400. An intermediate portion 44 of the terminal main body 40 that fixes the fixing member 400 to the outer periphery is a non-circular portion (an outer peripheral concave portion 441, a flat surface portion 442, a radial rib 452, a peripheral portion. A groove portion 46 and an adjacent portion 443). Therefore, it has a structure that prevents relative rotation between the terminal body 40 and the fixing member 400 in terms of the shape in the rotation direction centered on the axial direction. Therefore, even if a large load is applied to the external connection terminal (wire terminal 5) engaged with the rotation preventing portion 41 of the terminal body 40 in the rotation direction, the rotation between the terminal body 40 and the fixing member 400 is ensured. Can be prevented.
That is, the rotation preventing portion 41 formed on the terminal body 40 and the non-circular portion of the intermediate portion 44 of the terminal body 40 can reliably prevent the external connection terminal (wire terminal 5) from rotating with respect to the housing 3. .

  Further, the intermediate portion 44 of the terminal main body 40 includes a diameter changing portion (a large diameter flange portion 45, a small diameter flange portion 450, a circumferential groove portion 46, an end surface groove portion 451, an outer periphery portion, and the like. A recess 441). Therefore, as shown in FIGS. 23 and 24, the joint surface 49 between the intermediate portion 44 and the fixing member 400 is not linear but has a complicated shape from the outer contact portion 43 toward the inner contact portion 42. . That is, the area of the joint surface 49 is increased, and the path from the outer contact portion 43 to the inner contact portion 42 along the joint surface 49 becomes longer. Therefore, even if water enters the terminal main body 40 and the fixing member 400 from the outer contact portion 43, it is possible to prevent water from reaching the inner contact portion 40 from there. That is, it is possible to effectively prevent water from entering the housing 3.

  Moreover, since the intermediate part 44 has the large diameter collar part 45 and the small diameter collar part 450, while being able to effectively enlarge the area of the joint surface 49 between the intermediate part 44 and the fixing member 400, the joint surface The path from the outer contact portion 43 to the inner contact portion 42 along 49 can be effectively lengthened. Therefore, water can be effectively prevented from entering the housing 3 and the bonding strength between the intermediate portion 44 and the fixing member 400 can be increased.

A circumferential groove 46 is formed between the large diameter flange 45 and the outer contact portion 43. Therefore, it is possible to effectively prevent water from entering at the entrance of the water intrusion path outside the housing 3.
The terminal body 40 has an end surface groove portion 451 in the large diameter flange portion 45. Therefore, it is possible to increase the area of the joint surface 49 between the intermediate portion 44 and the fixing member 400 on the outer peripheral end surface having a large diameter, and to complicate the water intrusion path. Therefore, it is possible to efficiently increase the bonding strength between the terminal body 40 and the fixing member 400 and prevent water from entering.

  The terminal body 40 is formed by forming radial ribs 452 on the surface of the large-diameter flange 45. Therefore, by increasing the bonding area between the intermediate portion 44 and the fixing member 400, the bonding strength between them can be increased. Moreover, the rotation prevention between the terminal main body 40 and the fixing member 400 can be performed effectively.

  The intermediate portion 44 has a plurality of outer peripheral recesses 441. Therefore, by increasing the bonding area between the intermediate portion 44 and the fixing member 400, the bonding strength between them can be increased. Moreover, the rotation prevention between the terminal main body 40 and the fixing member 400 can be performed effectively. Furthermore, since the water intrusion path between the intermediate portion 44 and the fixing member 400 can be complicated, water intrusion into the housing 3 can be effectively prevented.

Further, since the fixing member 400 includes the flange portion 401 and the cylindrical portion 404, the output terminal 4 can be easily and stably fixed to the housing 3.
The tubular portion 404 includes an inner extending portion 405, and a circumferential space 406 is formed between the inner extending portion 405 and the inner contact portion 42. Therefore, the creeping distance between the inner contact portion 42 and the housing 3 can be increased, and the insulation resistance between the terminal body 40 and the housing 3 can be further increased.

  Further, the flange portion 401 is formed on the outer periphery of the large diameter flange portion 45. Thereby, the enlargement of the area of the joint surface 49 between the terminal body 40 and the fixing member 400 and the extension of the water intrusion path can be realized while preventing the output terminal 4 from being enlarged. As a result, it is possible to obtain a compact output terminal 4 that can effectively prevent water from entering and has high bonding strength between the terminal body 40 and the fixing member 400. That is, since the flange portion 401 needs to have a large diameter for assembling with the housing 3, the output terminal is provided by disposing the large-diameter flange portion 45 at a portion where the flange portion 401 having the large diameter is formed. The effect of preventing water intrusion and the strength of bonding between the terminal main body 40 and the fixing member 400 can be improved without increasing the size of 4. That is, it is not necessary to increase the size of the output terminal 4 in order to provide the large diameter flange 45.

Further, since the flange portion 401 includes the positioning portion 407, the output terminal 4 can be easily and accurately positioned and fixed with respect to the housing 3.
Further, the adjacent portion 443 in the intermediate portion 44 has the same cross-sectional outline as the outer contact portion 43. Thereby, the rotation prevention part 41 provided in the outer side contact part 43 and at least one part of the non-circular part in the intermediate part 44 can be formed continuously. That is, a part of the non-circular portion can be easily formed in the adjacent portion 443 in the intermediate portion 44.

  The output terminal 4 is configured to fix an external connection terminal (wire terminal 5) between the bolt 6 screwed into the screw hole 431 and the terminal body 40. Thereby, an external connection terminal can be attached to the output terminal 4 easily and reliably. Moreover, it becomes easy to produce the terminal body 40 as an integral metal part.

  The terminal body 40 is formed by forming the screw holes 40 in the axial direction from the outer contact portion 43 to the intermediate portion 44. Thereby, the fastening strength of the output terminal 4 and the volt | bolt 6 can be made high, without causing the enlargement of the terminal main body 40. FIG. That is, in order to sufficiently secure the bonding strength between the terminal body 40 and the fixing member 400, it is necessary to increase the area of the bonding surface 49 between them to some extent. Some size is required. As a result, an area for forming the screw hole 431 is secured to a certain size inside the intermediate portion 44. Therefore, even if the screw hole 431 is formed up to the intermediate portion 44, the diameter of the intermediate portion 44 does not increase only because of the screw hole 431. The fastening strength between the bolt 6 and the bolt 6 can be increased. Since the inner contact portion 42 does not have a role of joining to the fixing member 400, the size of the output terminal 4 can be prevented from being increased by forming the screw hole 431 as far as the intermediate portion 44. be able to.

  Further, since the output terminal 4 has the inner contact portion 42, the intermediate portion 44, and the outer contact portion 43 arranged in a straight line along the forming direction of the screw hole 431, the structure of the output terminal 4 is simplified. can do.

As described above, according to this example, the output terminal has a small number of parts, is inexpensive, can prevent water from entering the housing, and can reliably prevent rotation of the external connection terminal to be connected. The power supply device for vehicles which has can be provided.
In addition, the same effects as those of the first embodiment are obtained.

Example 9
In this example, as shown in FIGS. 25 and 26, a resin seal is formed in a circumferential space 406 between the inner contact portion 42 of the terminal body 40 and the inner extending portion 405 of the tubular portion 404 of the fixing member 400. This is an example in which the stop member 408 is filled.
The sealing member is made of an adhesive such as an epoxy resin and seals between the terminal body 40 and the fixing member 400 in a watertight manner in the circumferential space 406.
Others are the same as in the first embodiment.

In the case of this example, even if water enters between the intermediate portion 44 and the fixing member 400, the sealing member 408 can prevent water from entering the inside of the housing 3.
In addition, the same effects as those of the first embodiment are obtained.

(Example 10)
In this example, as shown in FIGS. 27 and 28, stud bolts 62 and nuts 61 are used as means for fixing the external connection terminals (wire terminals 5) to the output terminals 4.
That is, the stud bolt 62 is screwed and fixed to the screw hole 431 of the terminal body 40, the external connection terminal (wire terminal 5) is engaged with the stud bolt 62, and the nut 61 is fastened.
Others are the same as in the first embodiment.

Also in this example, the external connection terminal (wire terminal 5) can be easily and reliably fixed to the output terminal 4.
In addition, the same effects as those of the first embodiment are obtained.

The configuration of the output terminal 4 including the configuration of the anti-rotation portion 41 can be various in addition to the above-described embodiment.
Moreover, in the said Example, although the example which comprised the terminal main body 40 by the aluminum die-cast product was shown, the raw material and manufacturing method of the terminal main body 40 are not restricted to this.
In the above embodiment, the step-down DC-DC converter is exemplified as the vehicle power supply device. However, the present invention is not limited to this, and other vehicle power sources such as a step-up converter, an inverter, or an AC generator are used. The present invention can be similarly applied to an apparatus.

DESCRIPTION OF SYMBOLS 1 Power supply device for vehicles 2 Power supply part 3 Housing | casing 4 Output terminal 40 Terminal main body 42 Inner contact part 43 Outer contact part 400 Fixing member 41 Anti-rotation part 5 Wire terminal

Claims (17)

A vehicle power supply device mounted on a vehicle, comprising: a power supply unit that generates electric power; a housing that covers the power supply unit; and an output terminal that is fixed to the housing and extracts an output from the power supply unit. ,
The output terminal is connected to an external connection terminal for connecting to an external device to which power is supplied.
The output terminal is composed of a metal terminal body and a resin fixing member for fixing the output terminal to the housing.
The terminal body includes an inner contact portion connected to the power supply portion, an outer contact portion to which the external connection terminal is connected, and the fixing member interposed between the inner contact portion and the outer contact portion. It consists of an integral metal part with an intermediate part fixed to the outer periphery,
The outer contact portion has a detent portion that directly engages with the external connection terminal and restricts the external connection terminal from rotating with respect to the terminal body.
The intermediate portion has at least a part of a non-circular portion in which a cross-sectional outer shape orthogonal to the axial direction of the terminal body is non-circular, and the maximum diameter of the cross-sectional outer shape changes at a plurality of locations in the axial direction. A power supply device for a vehicle having a diameter changing portion.   2. The vehicle power supply device according to claim 1, wherein the intermediate portion has a flange portion having a diameter larger than a maximum diameter of both side portions in the axial direction.   3. The vehicle power supply device according to claim 2, wherein the intermediate portion has a large-diameter flange portion having a diameter larger than a maximum diameter of the outer contact portion as the flange portion. .   4. The vehicle power supply device according to claim 2, wherein a circumferential direction is formed between the flange portion and the outer contact portion formed at a position closest to the outer contact portion among the flange portions. A vehicular power supply device, wherein a circumferential groove is formed.   5. The vehicle power supply device according to claim 2, wherein the terminal main body includes an end surface groove portion formed in a circumferential direction on an outer peripheral end surface of the flange portion. 6. .   The vehicle power supply device according to any one of claims 2 to 5, wherein the terminal body is formed with radial ribs extending radially in a radial direction on a surface of the flange portion. Power supply.   The power supply device for vehicles according to any one of claims 1 to 6, wherein the intermediate portion includes an outer peripheral recess formed in a region that is a part of the entire circumference and a part of the entire length of the outer peripheral surface. A power supply device for a vehicle characterized by having a plurality.   The power supply device for a vehicle according to any one of claims 1 to 7, wherein the fixing member includes a flange portion that abuts on an outer surface of the housing, and extends from the flange portion toward the inner contact portion side. And a cylindrical portion inserted into an attachment hole provided in the housing.   9. The vehicle power supply device according to claim 8, wherein the cylindrical portion includes an inner extending portion that extends so as to cover a part of the inner contact portion from an outer peripheral side, and the inner extending portion and the above-described inner extending portion. A power supply device for a vehicle, wherein a circumferential space is formed between the inner contact portion.   The vehicle power supply device according to claim 9, wherein the circumferential space is filled with a resin sealing member.   The power supply device for a vehicle according to any one of claims 8 to 10, wherein the intermediate portion includes a large-diameter flange portion having a diameter larger than that of the outer contact portion as the flange portion, and the flange portion. Is formed on the outer periphery of the large-diameter collar portion.   The vehicle power supply device according to any one of claims 8 to 11, wherein the flange portion includes a positioning portion that engages with an outer surface of the housing.   The vehicle power supply device according to any one of claims 1 to 12, wherein a portion of the intermediate portion adjacent to the outer contact portion has the same cross-sectional outline as the outer contact portion. Power supply.   14. The vehicle power supply device according to claim 1, wherein a screw hole is formed in the terminal main body, and the bolt is engaged with the screw hole, and the terminal main body includes the screw hole. A vehicular power supply device configured to fix an external connection terminal.   15. The vehicle power supply device according to claim 14, wherein the terminal body has the screw hole formed in the axial direction from the outer contact portion to the intermediate portion.   16. The vehicle power supply device according to claim 14 or 15, wherein the output terminal has the inner contact portion, the intermediate portion, and the outer contact portion arranged in a straight line along a direction in which the screw holes are formed. A vehicular power supply device characterized by comprising:   The vehicle power supply device according to any one of claims 1 to 16, wherein the vehicle power supply device is a DC-DC converter for stepping down or stepping up DC power.

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