CN115241679A - Terminal block - Google Patents

Abstract

A waterproof structure of an exposed external terminal block in which a flat bus bar is insert-molded can save space and reduce cost, and has excellent layout. The terminal block is arranged so that the terminal block whose layout has been improved by insert-molding the complex-shaped flat bus bar is exposed to the outside of the casing, and the flat bus bar (4) of the terminal block is electrically connected to the inside of the casing. The bus bar has a cylindrical shape, and an outer peripheral surface chamfer (16) is provided at the front end of the cylindrical bus bar (12) so as to be compatible with the flat bus bar, the outer peripheral surface chamfer of the cylindrical bus bar, and the terminal block molding resin. A second sealing ring (17) is provided in the way of three-surface contact.

Description

Terminal block

technical field

The present application relates to a waterproof structure for a terminal block of an in-vehicle power conversion device.

Background technique

In the in-vehicle power conversion device, a terminal block is provided for connection to an external power supply and connection to a motor, and a cable terminal from the outside is fastened to the terminal block with a bolt for electrical connection.

In such a power conversion device, a structure is proposed in which a terminal block is provided in a casing, and the casing is provided with a cable insertion hole and a work hole for screwing the cable terminal to the terminal block, and the work The holes are arranged orthogonally to the cable insertion holes, and in addition, the bracket for fixing the cable to the casing is provided with a gasket for ensuring waterproofness with the casing, so that water, dust, etc. do not escape from the cable. The cable insertion hole and the work hole penetrate, and the work hole is closed with a cover having a waterproof function (for example, refer to Patent Document 1 and Patent Document 2).

On the other hand, there has been proposed a structure in which the terminal block is exposed to the outside of the casing, and a gasket is provided between a flat bus bar that electrically connects the terminal block and the inside of the casing and the terminal block molding resin (for example, refer to patent Reference 3).

prior art literature

Patent Literature

Patent Document 1: Japanese Patent Laid-Open No. 2004-327185

Patent Document 2: Japanese Patent Laid-Open No. 8-214492

Patent Document 3: Japanese Patent Laid-Open No. 2010-211933

SUMMARY OF THE INVENTION

The technical problem to be solved by the invention

As in the conventional examples of Patent Documents 1 and 2, if a terminal block for electrical connection with components outside the casing is provided inside the casing, as additional components, a cable fixing bracket with a waterproof gasket, a Covers with waterproof gaskets, and conductive foreign objects such as thread chips generated by attaching and detaching cable terminals during maintenance may penetrate into the inside of the case. To prevent short circuits between the terminals of the control circuit board and power semiconductors, the terminals A dust-proof structure is provided between the table and the casing, which may cause problems in saving space and reducing costs.

On the other hand, in the case of the structure in which the terminal block is exposed to the outside of the housing as in the conventional example of Patent Document 3, in order to provide a gasket between the flat bus bar and the mold resin of the terminal block, it is necessary to set the It is difficult to guarantee a structure in which a flat bus bar of a simple shape such as a straight shape or an L-shape is inserted into the resin. In order to improve the layout, a structure in which a flat bus bar of a complex shape is insert-molded is difficult to ensure. The sealing between the flat bus bar and the molding resin has a problem that the layout of the terminal block and the waterproofness cannot be satisfied at the same time.

The present application was made to solve the above-mentioned problems, and an object thereof is to obtain a waterproof structure of an exposed external terminal block in which a flat bus bar is insert-molded, which can save space and reduce cost, and is excellent in layout.

Technical solutions adopted to solve technical problems

The terminal block of the present application is characterized in that the terminal block whose layout has been improved by insert-molding a flat bus bar of a complicated shape is exposed to the outside of the housing, and the flat bus bar of the terminal block and the housing are arranged to be exposed. The busbars that are electrically connected internally have a cylindrical shape, and an outer peripheral surface chamfered portion is provided at the front end of the cylindrical busbar so as to be compatible with three of the flat busbar, the outer peripheral surface chamfered portion of the cylindrical busbar, and the terminal block molding resin. A sealing ring is provided in the way of surface contact.

Invention effect

According to the waterproof structure of the terminal block of the present application, since the terminal block is provided outside the casing, it is excellent in terms of space saving and cost reduction. In addition, since the terminal block is formed by insert-molding a flat bus bar of a complicated shape, the layout is excellent, and the communication part between the terminal block and the inside of the body is made a simple shape and a sealing part is provided in this part, Therefore, it is excellent in waterproof performance and salt water resistance.

Description of drawings

FIG. 1 is an external view of a power conversion device according to Embodiments 1 to 3 of the present application.

2 is an external view of a terminal block according to Embodiments 1 to 3 of the present application.

3 is an A-A cross-sectional view of the terminal block according to Embodiments 1 to 3 of the present application.

4 is a B-B cross-sectional view of the terminal block according to Embodiments 1 to 3 of the present application.

5 is an enlarged view of the periphery of a sealing ring provided in the terminal block according to Embodiments 1 to 3 of the present application.

6 is a vertical cross-sectional view of the seal ring according to the second embodiment of the present application.

7 is a longitudinal cross-sectional view of the seal ring according to the third embodiment of the present application.

Symbol Description

1 case

2 terminal block

3 connecting holes

4 The first flat bus bar

5 Electrical connections

6 first stud

7 first nut

8 Harness Terminals

9 Second stud

10 Cylinder Resin Holes

11 Electrical connection

12 Cylinder Bus Bar

13 Second plate bus bar

14 Second Nut

15 The first sealing ring

16 Outer peripheral surface chamfer

17 Second sealing ring

18 Outer peripheral surface chamfer

Detailed ways

Hereinafter, Embodiment 1 of the present application will be described with reference to the accompanying drawings.

In addition, in each drawing, the same code|symbol represents the same or equivalent member.

Embodiment 1

1 is an external view of a casing 1 of an in-vehicle power conversion device according to Embodiments 1 to 3 of the present application, and FIG. 2 is an external view of a terminal block 2 for electrical connection with components outside the casing.

According to FIGS. 1 and 2 , a terminal block 2 for electrical connection with components outside the casing is provided outside the casing 1 , and a communication hole for electrically connecting the terminal block to the inside of the casing is provided on the wall surface of the casing 1 3, with the internal electrical connection. Thereby, since the cable fixing bracket with the waterproof gasket and the cover with the waterproof gasket, which are required when the terminal block is installed inside the casing, are not required, it is excellent in terms of space saving and cost reduction. of.

3 and 4 respectively show an A-A cross-sectional view and a B-B cross-sectional view of the terminal block 2 . According to FIGS. 3 and 4 , in the terminal block 2 , the first plate bus bar 4 is insert-molded on the resin-made terminal block. Thereby, the bus bar can be formed into a complicated shape, which is excellent in space saving and layout.

One side of the first plate bus bar 4 is provided with an electrical connection portion 5 that is electrically connected to the outside of the casing, and a first stud bolt 6 perpendicular to the plane of the first plate bus bar and facing the outside of the casing is pressed into the electrical The connection portion 5 is electrically connected to a harness terminal 8 extending from a member outside the housing by being fastened with the first nut 7 .

The second stud bolt 9, which is perpendicular to the plane of the first plate bus bar 4 and faces the inside of the casing, is pressed into the other side of the first plate bus bar 4. The resin of the terminal block is hollowed out into a cylindrical cylindrical resin hole 10 to expose an electrical connection portion 11 that is electrically connected to the inside of the housing.

A cylindrical bus bar 12 is inserted into the cylindrical resin hole 10 . One side of the cylindrical bus bar 12 is in contact with the electrical connection portion 11 of the first plate bus bar, and the other side passes through the communication hole 3 to connect with the inside of the casing. The second flat bus bar 13 is in contact with the second flat bus bar 13, the second stud bolt 9 penetrates through the holes provided in the cylindrical bus bar 12 and the second flat bus bar 13 and is fastened with the second nut 14, thereby passing through the cylindrical bus bar 12 The first plate bus bar 4 is electrically connected with the second plate bus bar 13 .

FIG. 5 shows an enlarged view of the periphery of the electrical connection portion 11 in the first plate bus bar that is electrically connected to the inside of the casing. According to FIG. 5 , a first sealing ring 15 is provided on the surface of the casing around the communication hole 3 in contact with the terminal block to prevent water and dust from entering the casing. In addition, in the first embodiment, the first seal ring 15 has a surface seal structure, but it may be a shaft seal that abuts on the communication hole 3 .

An outer peripheral surface chamfer 16 is provided on the surface of the cylindrical bus bar 12 that is in contact with the first plate bus bar so as to be in contact with the outer peripheral surface chamfer 16 , the inner diameter of the cylindrical resin hole 10 and the first plate bus bar and inside the casing A second sealing ring 17 is provided in such a manner that the three surfaces of the electrically connected electrical connection portion 11 are in contact with each other. Thereby, water infiltrating from the interface between the resin of the terminal block and the bus bar is prevented from entering both the interface between the cylindrical bus bar 12 and the electrical connection portion 11 and the gap between the cylindrical bus bar 12 and the cylindrical resin hole 10 by one sealing ring. It is immersed in all directions, and since the sealing ring installation part saves space, the contact area between the cylindrical bus bar 12 and the electrical connection part 11 can be maximized, so it is excellent in terms of low energization resistance. In addition, It is also excellent in terms of cost reduction.

The outermost diameter of the press-fit portion of the second stud bolt 9 is φd, the inner diameter of the cylindrical bus bar is φD1, and the outermost diameter of the cylindrical bus bar in contact with the first flat bus bar is φD2. , and set the relationship of D1<d<D2. As a result, the axial force generated by the tightening of the second nut 14 is applied to the press-fit portion of the second stud bolt 9. Therefore, even if the first plate bus bar 4, the cylindrical bus bar 12, the first plate bus bar 4, the cylindrical bus bar 12, the second stud When the two stud bolts 9 contract or expand, a high surface pressure can be maintained at the interface between the first plate bus bar 4 and the second stud bolt 9, and therefore, it has the effect of preventing water intrusion.

Embodiment 2

6 is a longitudinal cross-sectional view of the second sealing ring 17 according to the second embodiment of the present application. According to FIG. 6 , the cross-section is hexagonal, which is in surface contact with the electrical connection portion 11 and chamfered with the inner diameter and outer peripheral surface of the cylindrical resin hole 10 Section 16 line contacts. Therefore, even if the wire diameter of the second sealing ring 17 is set to be small to ensure the contact area between the first plate bus bar 4 and the cylindrical bus bar 12, to suppress the energization resistance, and to realize space saving, if the use of Similar to the cylindrical bus bar 12, a cylindrical insertion jig having an outer peripheral surface chamfered portion at the front end is provided, and the second seal ring 17 is inserted into the cylindrical resin hole 10, and the second seal ring 17 is accommodated in the insertion jig. Since the chamfered portion of the outer peripheral surface and the groove formed by the cylindrical resin hole 10 are inserted into the groove, the second seal ring 17 can also be assembled to a predetermined position without being twisted.

In addition, a slight resin burr may be generated on the inner diameter side at the intersection of the insert-molded first flat bus bar and the cylindrical resin hole 10. However, since the second sealing ring 17 is provided with the cylindrical resin hole Since the outer peripheral surface chamfered portion 18 of the shape in which the inner diameter of 10 is in line contact, the second sealing ring 17 can stably contact and seal the electrical connection portion 11 without being caught on the resin burr.

Embodiment 3

FIG. 7 is a vertical cross-sectional view of the second seal ring 17 according to Embodiment 3 of the present application, and according to FIG. 7 , the cross section is hexagonal and has a plane-symmetric shape. Thereby, when assembling the second seal ring 17, erroneous mounting in the vertical direction does not occur, so not only is it excellent in terms of quality, but also equipment introduction and processes for preventing erroneous mounting are not required, thereby reducing cost This aspect is also excellent.

In addition, the cross section is set wider in the axial direction than in the radial direction, whereby line contact between the second seal ring 17 and the outer peripheral surface chamfer 16 of the cylindrical bus bar can be achieved.

The present application describes various exemplary embodiments, but the various features, forms, and functions described in one or more embodiments are not limited to application to a specific embodiment, and can be applied individually or in various A combination of ways is applied to the embodiments.

Therefore, innumerable modification examples which are not illustrated are envisaged within the technical scope disclosed in this application. For example, at least one of the constituent elements is modified, added, or omitted, and at least one of the constituent elements is extracted and combined with the constituent elements of other embodiments.

Claims (3)

1. A terminal block, which is a terminal block provided by a vehicle-mounted power conversion device, and the terminal block is used for electrical connection with a component outside a casing, characterized in that: The terminal block is arranged to be exposed to the outside of the casing, A communication hole is provided on the wall surface of the casing, and the communication hole is used to electrically connect the terminal block to the inside of the casing, In the terminal block, a first plate bus bar is insert-molded on the terminal block made of resin, An electrical connection part electrically connected to the outside is provided on one side of the first plate bus bar, and a plane perpendicular to the plane of the first plate bus bar is pressed into the other side of the first plate bus bar. towards the studs inside the enclosure, By providing a cylindrical resin hole, which is coaxial with the stud bolt and formed by hollowing out the resin of the terminal block, the electrical connection part electrically connected to the inside of the casing is exposed. cylindrical, A cylindrical bus bar is inserted into the cylindrical resin hole, one side of the cylindrical bus bar is in contact with the first plate bus bar, and the other side of the cylindrical bus bar passes through the communication hole to in contact with the second flat bus bar disposed inside the casing, The stud bolts penetrate through the holes provided in the cylindrical bus bar and the second flat bus bar and are fastened by nuts, so that the first flat bus bar and the second flat bus bar are connected to each other through the cylindrical bus bar. The two flat bus bars are electrically connected, A first sealing ring is arranged on the surface of the casing around the communication hole that is in contact with the terminal block, An outer peripheral surface chamfered portion is provided on the surface of the cylindrical bus bar that is in contact with the first plate bus bar, A second sealing ring is provided in contact with the three surfaces of the chamfered portion of the outer peripheral surface, the inner diameter of the cylindrical resin hole, and the first plate bus bar, The outermost diameter of the press-fit portion of the stud bolt is φd, the inner diameter of the cylindrical bus bar is φD1, and the outermost diameter of the cylindrical bus bar in contact with the first plate bus bar is φd. is φD2, and at this time, the relationship of D1<d<D2 is established. 2. The terminal block of claim 1, wherein The second sealing ring is in surface contact with the first plate bus bar, and the second sealing ring is in line contact with the inner diameter of the cylindrical resin hole and the chamfered portion of the outer peripheral surface of the cylindrical bus bar. 3. The terminal block according to claim 1 or 2, wherein The cross section of the second sealing ring is formed in a hexagonal shape and is formed in a plane-symmetric shape.

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