JP3675205B2 - Power steering device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a power steering device for an automobile in which a motor and a motor control device are integrated.
[0002]
[Prior art]
FIG. 4 shows a cross-sectional view of a motor, a motor control device, and a housing in which these are integrated in a power steering device according to the prior art. The motor 20 has a brush 21, and the brush 21 is supported by a brush support portion 22. The harness 7 extends from the brush support portion 22, and electric power is supplied to the motor 20 through the harness 7.
The harness 7 passes through the through hole of the rubber grommet 6 and extends to the inside of the housing of the motor control device 10, and the lead wire portion (harness terminal) at the tip thereof is connected to the base 9 of the motor control device 10 with a screw 8. Has been. The base 9 is made of metal and is connected to the power supply line of the motor control device 10.
[0003]
[Problems to be solved by the invention]
In the power steering device according to the prior art as described above, since the harness terminal must be connected to the base 9 of the motor control device 10 with the screw 8, the work efficiency in the assembly work is low.
In addition, since the unit price of the harness used in such a power steering apparatus is relatively low, the production cost of the conventional power steering apparatus as described above is high.
[0004]
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a power steering device that is low in production cost in terms of both assembly work efficiency and component unit cost.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, the following means are effective.
That is, the first means includes a motor that directly or indirectly rotates the power steering gear or power steering shaft of the automobile and a motor control device that controls electric power supplied to the motor. In a steering device, a plurality of rod-shaped or plate-shaped metal motor-side bus bars that extend from the inside to the outside of the motor, and a plurality of rod-shaped or plate-shaped metal that extend from a power supply line of the motor control device A motor control device side bus bar , and a part of the motor control device housing and a part of the motor housing having a plurality of bus bar through holes that penetrate the motor side bus bar. formed by the joining member, and an inner housing inside the motor housing of the motor control device, and隔塞this joint members together, the motor control By connecting so as to face each other and the motor-side bus bar and the motor controller-side bus bar inside the location of the housing, is to electrically connect the motor and the motor controller.
[0006]
Further, the second means is to connect the motor side bus bar and the motor control device side bus bar by resistance welding or soldering in the first means.
[0007]
Further, a third means is a motor for driving an electric pump for supplying oil to a hydraulic power steering gear or a power steering shaft of an automobile in the first means described above, joining member is to have a vent tube that is bent.
By the above means, the above problem can be solved.
[0008]
[Operation and effect of the invention]
According to the first means, the connection between the motor and the motor control device can be performed only by connecting the motor side bus bar and the motor control device side bus bar by resistance welding or soldering. Therefore, the working efficiency related to this connection is improved as compared with the prior art.
In addition, the metal bus bar is a flat conductor, and its unit price is relatively lower than that of the harness. Therefore, the production cost can be reduced from the viewpoint of material cost.
Further, since the metal bus bar has higher mechanical strength than the harness, the conventional failure due to the disconnection of the harness is eliminated, and the reliability is superior to the conventional one.
[0009]
Further, according to the second means, the motor side bus bar and the motor control device side bus bar can be reliably connected and connected by being connected by the resistance welding or soldering. Thereby, both bus bars do not leave | separate by vibration etc., and it can improve reliability.
[0010]
Further, according to the third means, when the power steering apparatus is completely waterproofed, the inner side of the motor side housing is maintained at substantially the same pressure as the inner side of the motor control apparatus side housing by the vent hole. be able to. In other words, the air pressure change can be mitigated by the air hole due to the temperature change inside the housing on the motor side. Therefore, the oil of the pump is sucked from the oil seal portion 42 to the inside of the housing on the motor side, so that the motor does not fail.
Further, according to this means, since the vent hole has a bent tubular shape, fine powdery metal powder (hereinafter referred to as brush powder) generated by friction between the brush 21 and the commutator 23 is on the motor control device side. There is also an effect that the motor control device does not break down because it does not enter the inside of the housing.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on specific examples.
1 and 2 are sectional views of a motor, a motor control device, and a housing in which these are integrated in the power steering device of the present invention.
The DC motor 20 is blocked (waterproof and sealed) from the outside by housings 25a and 25b. The brush 21 is supported by a brush support portion 22, and the commutator 23 rotates while being in contact with the brush 21 about the rotation shaft 24.
[0012]
The motor control device 10 is mainly composed of a power supply connecting portion 12, an electronic component 13, a relay switch 14, housings 15a and 15b, and the inside of the housing is a housing cap 16 and a housing cap fastening member 11a ( It is cut off (watertight and sealed) from the outside by male screws), 11b (female screws), and the like.
The pump arrangement portion 40 is provided with an oil conduit 41, an oil seal portion 42, and the like, which are integrally formed by the housings 15a and 25a.
[0013]
The brush support portion 22 is integrally molded with resin (bus bar insertion molding) in a state of including a part of each of the four motor-side bus bars 1. The joining member 3 closes the space inside each housing on the motor side and the motor control device side so as to separate the four bus bar through holes 31 (FIG. 3A) of the joining member 3 described above. The four motor-side bus bars 1 pass therethrough.
On the other hand, there are a total of four bus bars 2 on the motor control device side, and one end of each is connected to an input / output terminal or the like of the electronic component 13 of the motor control device. The other end of each bus bar 2 on the motor control device side is connected to the four motor side bus bars 1 on the inside of the housings 15a and 15b of the motor control device 10, respectively, and resistance welding is performed. Or it is couple | bonded by soldering.
[0014]
FIG. 2 shows a side view of the motor control device according to the present invention as viewed in the direction A when the housing cap of the motor control device is removed.
In this way, the four motor-side bus bars 1 and the four motor control-side bus bars 2 are connected so as to face each other, and connected by resistance welding or soldering, so An electric power supply path for the motor 20 is secured, whereby the motor control device 10 can supply the DC motor 20 while controlling electric power.
[0015]
In this way, the power supply path to the DC motor 20 is made to face the plurality of bus bars 1 and 2 so that the bus bars 1 and 2 are resistance welded from one side or the other when assembled as shown in FIG. Since they are connected by soldering, connection workability can be improved. Further, it is possible to weld the bus bars 1 and 2 using a welding robot.
As a result, the work time in the connection work between the DC motor 20 and the motor control device 10 is shortened as compared with the prior art. In addition, the parts cost for the power supply path could be reduced.
[0016]
FIG. 3 shows a front view (a) and a sectional view (b) of the joining member 3 constituting a part of the housing in the power steering apparatus of the present invention.
As shown in FIG. 1, the joining member 3 is a component that constitutes a part of each housing on the motor side and the motor control device side. As shown in the cross-sectional view (b), since the main joining member 3 includes the bent air holes 32, the air pressure inside the respective housings on the motor side and the motor control device side is maintained at substantially the same value.
[0017]
Accordingly, the air pressure change due to the temperature change inside the housing on the motor side can be mitigated by this vent hole 32, and the oil of the pump is sucked into the inside of the housing on the motor side from the oil seal portion 42. The motor no longer fails due to the cause.
[0018]
Further, since the vent hole 32 has a bent tubular shape, the brush powder generated by the friction between the brush 21 and the commutator 23 does not enter the inside of the housing on the motor control device side, and the motor control device may break down. Lost.
The vent hole 32 may be a crank-shaped bent tube in addition to the one shown in FIG.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a motor, a motor control device, and a housing integrating them in a power steering device of the present invention.
FIG. 2 is a side view as viewed in the direction A when the housing cap of the motor control device in the power steering device of the present invention is removed.
FIGS. 3A and 3B are a front view and a cross-sectional view, respectively, of a joining member constituting a part of a housing in the power steering apparatus of the present invention.
FIG. 4 is a cross-sectional view of a motor, a motor control device, and a housing integrating them in a power steering device according to the prior art.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Motor side bus bar 2 ... Motor control apparatus side bus bar 3 ... Joining member 31 ... Bus / bar through-hole 32 ... Vent hole 32a ... Vent hole part (motor side)
6 ... Grommet 7 ... Harness 8 ... Screw 9 ... Base 10 ... Motor controller 11a ... Housing / cap fastening member (male screw)
11b ... Housing / cap fastening member (female thread)
DESCRIPTION OF SYMBOLS 12 ... Power supply connection part 13 ... Electronic component 14 ... Relay switch 15 ... Housing of motor control device 16 ... Housing cap 20 ... DC motor 21 ... Brush 22 ... Brush support part 23 ... Commutator 24 ... Rotary shaft 25 ... Motor shaft Housing 40 ... Pump arrangement part 41 ... Oil conduit 42 ... Oil seal part

Claims (3)

In a power steering device having a motor that directly or indirectly rotates a power steering gear or a power steering shaft of an automobile, and a motor control device that controls electric power supplied to the motor,
A plurality of rod-shaped or plate-shaped metal motor-side bus bars extending from the inside of the motor to the outside;
A plurality of rod-shaped or plate-shaped metal motor control device side bus bars extending from the power supply line of the motor control device,
A part of the housing of the motor control device and a part of the housing of the motor are formed by sharing a joint member having a plurality of bus bar through holes through which the motor side bus bar passes,
The inside of the housing of the motor control device and the inside of the housing of the motor are separated from each other by the joining member,
The motor-side bus bar and the motor control device-side bus bar are connected to face each other inside the housing of the motor control device, thereby electrically connecting the motor and the motor control device. A power steering device characterized by that. The power steering apparatus according to claim 1, wherein the connection is made by connecting the motor-side bus bar and the motor control-side bus bar by resistance welding or soldering. The motor is a motor that drives an electric pump that supplies oil to a hydraulic power steering gear or power steering shaft of an automobile,
The joining member is a power steering apparatus according to claim 1, characterized in <br/> have a vent tube that is bent.

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