JP4228532B2 - Wiring structure of power electronic circuit device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wiring structure of a power electronic circuit device, and more particularly to a waterproof wiring structure of a power electronic circuit device having a bus bar.
[0002]
[Prior art]
In general, a bus bar that is inexpensive and does not require an insulating coating removal process or the like is used for a large current portion in the internal wiring of the power electronic circuit device.
[0003]
A conventional example of the wiring structure of a power electronic circuit device having this type of bus bar is shown in FIGS.
[0004]
In order to connect the bus bar 1 to electrical equipment outside the power electronic circuit device such as a battery or a motor, a bus bar fixing terminal block 30 is provided in the metal case 2 for housing the power electronic circuit device. A through hole 20 is provided in the metal case 2, and the insulation coated cable 40 is inserted into the metal case 2 from the through hole 20, and the tip of the insulation coated cable 40 is fastened to the terminal block 30.
[0005]
In the case of improving the electromagnetic shielding function by using a shielded cable having a shield metal part as the insulation-coated cable 40, the shield metal part is connected at the tip of the insulation-coated cable 40 in order to connect the shield metal part to the metal case 2. Is exposed, and the exposed portion of the shield metal portion and the metal case 2 are connected by the grounding wire 50.
[0006]
2 and 3, in order to further improve the electromagnetic shielding function, a cylindrical metal housing 60 is fixed to the through hole 20 of the metal case 2, and the ring is loosely fitted to the insulation-coated cable 40 that is a shield cable. A metal housing 70 is screwed to a cylindrical metal housing 60. Reference numeral 80 denotes a grommet.
[0007]
[Problems to be solved by the invention]
However, the structure shown in FIGS. 2 and 3 for connecting the bus bar to the external cable (for example, known as a skin top as a product name) has a large number of parts, a complicated structure, and an assembling man-hour. There is a problem that is complicated. Moreover, the enlargement of the apparatus was invited.
[0008]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a wiring structure of a power electronic circuit device having a simple structure with a small number of parts and assembly man-hours for a bus bar and an external cable. .
[0009]
[Means for Solving the Problems]
The wiring structure of the power electronic circuit device according to claim 1 includes a case having a through hole, a bus bar fixed to a terminal of a power circuit component in the case, and an outer surface of the case surrounding the through hole. In the wiring structure of the power electronic circuit device comprising a case-side connector having a connector case that is fixed and fitted with the connector case of the cable-side connector,
The case side connector is
A metal flange-like cylindrical portion as the connector case that is fixed to the outer surface of the metal case surrounding the through-hole, and a through-hole that is smaller in diameter than the through-hole through which the bus bar passes An electrically insulating member that is in close contact with the inner peripheral surface of the flange-shaped cylindrical portion and the outer surface of the case, and the bus bar that forms a connector pin terminal,
End of the bus bar, and the connector pin end of the case-side connector protrudes into the through-hole and said through hole are sequentially through to the casing side in a connector of the insulating member of the case,
The flange-shaped cylinder portion is characterized by protruding in a direction away from the outer surface of the case rather than the bus bar as the connector pin terminal .
[0010]
In other words, according to this configuration, the bus bar also serves as a pin-shaped terminal (actually a flat plate shape) of a connector (that is, a case side terminal structure for cable connection) fixed to the outer surface of the case. Connection space with connector pin terminals, connection work, and the necessary space for connection can be saved. As a result, it is possible to realize a wiring structure of a power electronic circuit device with a small number of parts and an assembling man-hour and a simple structure.
[0011]
In the wiring structure of the power electronic circuit device according to the present invention, the cable-side connector further surrounds the distal end portion of the shielded cable so as to surround the flange-shaped cylindrical portion from the proximal end portion fixed to the shielded cable. An insulating cylindrical cover and a fitting extending in a direction substantially parallel to the cylindrical cover so that the base end is fixed to the conductor core wire exposed at the distal end of the shielded cable and can be fitted to the distal end of the bus bar A base end portion is fixed to a shield metal portion of the shield cable and is positioned between the base terminal portion and the base terminal portion of the cylindrical cover and the base terminal portion, and from the base tube cover and the base terminal. It is closed and a shield terminal for substantially extending parallel to the adherable to said tubular cover and the fitting pin to the inner peripheral surface of the flange-like cylindrical portion away respectively.
[0012]
That is, according to this configuration, the metal flange-shaped cylindrical portion protruding from the outer surface of the metal case surrounds and protects the front end portion of the bus bar that functions as a connector pin terminal, and Electromagnetic shield. Furthermore, this flange-shaped cylindrical portion is fitted into the electrically insulating cylindrical cover of the cable-side connector, supports and holds the cable-side connector, and is in close contact with the shield terminal of the cable-side connector. The shield metal part of the shield cable is installed through and the conductor core wire of the shield cable is electromagnetically shielded.
[0013]
As a result, the shield cable and the bus bar tip can be electromagnetically shielded with a simple structure.
[0014]
According to a second aspect of the present invention, in the wiring structure of the electronic circuit device for electric power according to the first aspect, the cylindrical cover of the cable side connector further includes a buffer ring capable of closely adhering a distal end surface of the flange-shaped cylindrical portion over the entire circumference. Since the seating surface is provided, the waterproof property can be improved.
[0015]
According to a third aspect of the present invention, the wiring structure of the power electronic circuit device according to the first or second aspect further includes an electrically insulating sleeve member interposed between the shield terminal and the fitting terminal. It is characterized by.
[0016]
Thereby, while being able to improve the electrical insulation between a shield terminal and a fitting terminal, it can control the undesirable deformation | transformation of a shield terminal and enables desirable elastic deformation, Therefore A shield terminal and a flange The contact resistance with the cylindrical portion can be reduced.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partial longitudinal sectional view showing a wiring structure of a power electronic circuit device according to this embodiment.
[0018]
1 is a bus bar used for internal wiring of equipment, 2 is a side wall of an aluminum case, 3 is an O-ring, 4 is a metal flange-shaped cylindrical portion, and 5 is a stem with a hole made of resin (electrical insulation member) , 6 is a screw, 7 is a shield cable for high current, 8 is a grommet, 9 is a shield mesh wire (shield metal part) of the shield cable 7, 10 is a cylindrical cover made of resin, 11 is a fitting terminal, A shield terminal, 13 is an electrically insulating sleeve member, and 14 is a packing (buffer ring).
[0019]
The connector pin terminal constituted by the front end portion of the bus bar 1, the metal flange-like cylindrical portion 4, and the holed stem 5 constitute the cable-side connector referred to in the present invention, and include a grommet 8, a resin-made cylindrical cover 10, The fitting terminal 11, the shield terminal 12, the electrically insulating sleeve member 13, and the packing 14 constitute a cable side connector referred to in the present invention.
[0020]
The bus bar 1 is fastened to a terminal of a high-current circuit component (not shown) in the case, and a tip portion of the bus bar 1 protrudes outside through the through hole 20 of the side wall 2 of the case.
[0021]
The flange-shaped cylindrical portion 4 is fixed to the outer surface of the side wall 2 of the case so as to surround the through hole 20 with the screw 6.
[0022]
A resin holed stem (electrical insulating member) 5 is fitted into the inner peripheral surface of the flange-shaped cylindrical portion 4 and pressed against the outer surface of the side wall 2 of the case. The stem 5 has a through hole through which the bus bar 1 protrudes.
[0023]
A fitting terminal 11 is caulked and fixed to a conductor core wire (not shown) exposed at the tip of the shielded cable 7. This conductor core wire is covered with an intermediate resin coating, and a shield net 9 is applied thereon, and a surface resin coating is further applied thereon. The fitting terminal 11 can be satisfactorily fitted to the distal end portion of the bus bar 1.
[0024]
The shield mesh wire 9 is exposed at a predetermined distance from the fitting terminal 11 in the longitudinal direction of the shield cable 7, and the shield mesh wire 9 is soldered to the base end portion of the shield terminal 12 made of a long metal piece. The electrically insulating sleeve member 13 is press-fitted between the shield terminal 12 and the fitting terminal 11 to insulate and separate both terminals. The shield terminal 12 is curved, and is urged inward in the longitudinal direction by the inner peripheral surface of the flange-shaped tube portion 4 when the two connectors are fitted to improve the adhesion between the flange-shaped tube portion 4 and the shield terminal 12. Yes. At the same time, the shield terminal 12 is pressed against the outer peripheral surface of the sleeve member 13 by the above urging to restrict the disconnection of both connectors.
[0025]
The cylindrical cover 10 is fixed to the shield cable 7 at a predetermined distance from the shield net 9 in the longitudinal direction of the shield cable 7, and the grommet 8 is fixed to the inside thereof.
On the inner peripheral surface of the cylindrical cover 10, a stepped surface with a packing 14 that contacts the tip end surface of the flange-shaped cylindrical portion 4 is formed.
[0026]
It is also possible to provide a stopper stopper structure by providing a rib at the tip of the cylindrical cover 10 and providing a recess into which the rib is fitted on the outer peripheral surface of the flanged cylindrical portion 4.
[0027]
According to this structure, the fitting terminal 11 and the bus bar 1, the shield terminal 12 and the flange-shaped tubular portion 4 can be satisfactorily adhered by simply fitting the cable-side connector into the case-side connector. Since 10 employs a structure that surrounds them, it is possible to realize a wiring structure that is simple in coupling, has a small number of parts, and has excellent electromagnetic shielding properties and waterproofness.
[0028]
More specifically, since the flange-shaped cylindrical portion 4 that electromagnetically shields and mechanically protects the front end portion of the bus bar 1 and the fitting terminal 11 also serves as a power supply member that supplies a ground potential to the shield mesh wire 9 of the shield cable 7. This has the advantage of not requiring an extra ground wiring for grounding the wire 9.
[0029]
Note that an O-ring may be provided on the outer peripheral surface of the flange-shaped cylindrical portion 4 instead of the packing 14.
[0030]
In addition, when an electromagnetic shield is not required, the shield net | wire 9 can be abbreviate | omitted and the flange-shaped cylinder part 4 can be changed into resin.
[Brief description of the drawings]
FIG. 1 is a partial longitudinal sectional view showing an embodiment of a wiring structure of a power electronic circuit device of the present invention.
FIG. 2 is a partial horizontal sectional view showing a conventional wiring structure of a power electronic circuit device having a bus bar.
3 is a partial vertical sectional view of a conventional wiring structure of a power electronic circuit device having a bus bar shown in FIG. 2;
[Explanation of symbols]
1 Busbar (connector pin terminal)
2 Side wall of the case (case)
20 Through-hole 4 Flange-shaped cylindrical part (connector case on the case side) 5 Stem (electrical insulating member)
10 cylindrical cover 11 fitting terminal 12 shield terminal 14 packing (buffer ring)
13 Sleeve member

Claims (3)

A case having a through hole;
A bus bar fixed to a terminal of a power circuit component in the case;
A case-side connector having a connector case that is fixed to the outer surface of the case so as to surround the through-hole and fits with the cable-side connector;
In the wiring structure of a power electronic circuit device comprising:
The case side connector is
A metal flange-like cylindrical portion as the connector case that is fixed to the outer surface of the metal case surrounding the through-hole, and a through-hole that is smaller in diameter than the through-hole through which the bus bar passes An electrically insulating member that is in close contact with the inner peripheral surface of the flange-shaped cylindrical portion and the outer surface of the case, and the bus bar that forms a connector pin terminal,
The end portion of the bus bar sequentially penetrates the through hole of the case and the through hole of the insulating member and protrudes into the case side connector to serve as a connector pin terminal of the case side connector.
The flange-like cylindrical portion, projecting in a direction away from the outer surface of the case than the bus bar as the connector pin terminals,
Before Symbol cable side connector,
An electrically insulating cylindrical cover that surrounds the distal end portion of the shielded cable so as to be able to surround the flanged cylindrical portion from the base end portion fixed to the shielded cable;
A fitting terminal extending in a direction substantially parallel to the cylindrical cover so that the base end is fixed to the conductor core wire exposed at the tip of the shielded cable and can be fitted to the tip of the bus bar;
A base end portion is fixed to a shield metal portion of the shielded cable located between the base end portion of the cylindrical cover and the fitting terminal, and apart from the cylindrical cover and the fitting terminal, respectively. A shield terminal extending substantially parallel to the tubular cover and the fitting terminal so as to be able to be in close contact with the inner peripheral surface of the flange-shaped tubular portion;
A wiring structure for a power electronic circuit device. In the wiring structure of the electronic circuit device for electric power according to claim 1 ,
The cylindrical cover of the cable side connector is:
A wiring structure for an electronic circuit device for electric power, characterized in that the front end surface of the flange-shaped cylindrical portion has a seating surface with a buffer ring that can be in close contact with the entire circumference. In the wiring structure of the power electronic circuit device according to claim 1 or 2 ,
A wiring structure of an electronic circuit device for electric power, comprising an electrically insulating sleeve member interposed between the shield terminal and the fitting terminal.

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