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Electric power steering device

An electric power steering and electric motor technology, which is applied to electric steering mechanisms, power steering mechanisms, electromechanical devices, etc., can solve problems such as short-term immersion in water, and achieve the effect of inhibiting the deterioration of waterproof performance and maintaining the effect of breathing.

Active Publication Date: 2020-12-22
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although the conventional electric power steering devices disclosed in Patent Documents 1 and 2 are configured to ensure predetermined waterproofness as described above, when they are installed near the rack shaft that turns the tires of the vehicle, they are exposed to water and dust. , may sometimes be immersed in water for a short time, and waterproof measures with considerable durability are required

Method used

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Examples

Experimental program
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Effect test

Embodiment approach 1

[0033] Hereinafter, the electric power steering device according to Embodiment 1 will be described in detail based on the drawings. figure 1 It is a configuration diagram showing a steering system of a vehicle to which the electric power steering device according to Embodiment 1 is mounted. exist figure 1 Among them, the electric power steering apparatus 10 of Embodiment 1 includes a motor 7 and a control unit 6 that controls the motor 7 . The electric motor 7 and the control unit 6 are axially arranged side by side on the same axis, and axial end portions opposite to each other are joined together to be integrated. The electric power steering device 10 is attached to the pinion unit 8 such that the extending direction of its axis is parallel to the extending direction of the axis of the rack shaft unit 2 of the vehicle.

[0034] The torque sensor 3 is provided on the steering column surrounding the steering shaft 101 , detects the steering torque applied to the steering sha...

Embodiment approach 2

[0060] Next, an electric power steering system according to Embodiment 2 will be described. The electric power steering system according to Embodiment 2 includes: a first breathing device as a motor side breathing device and a second breathing device as a control unit side breathing device, and the breathing function of the second breathing device is set to be higher than that of the first breathing device. High performance. Other structures and operations are the same as those of the electric power steering device in the first embodiment.

[0061] When comparing the above-mentioned first breathing apparatus 15 and the second breathing apparatus 22, there is a big difference in the configured external environments. That is, the ventilation path through which the first breathing device 15 communicates communicates from the inside of the electric power steering device 10 to the outside through the gear unit 8 and the rack shaft unit 2 . On the other hand, the ventilation path ...

Embodiment approach 3

[0066] Next, an electric power steering system according to Embodiment 3 will be described. Figure 5 It is a partial sectional view of the electric power steering device according to the third embodiment. exist Figure 5 Among them, an oil seal portion 18 is attached between the output shaft 11 and the bearing mounting portion 7b1 of the housing wall portion 7b on the side surface on the opposite side to the motor that does not include the waterproof support bearing 12 . The oil seal 18 is composed of, for example, a seal lip 18a made of fluororesin, an outer peripheral eyelet 18b, and an inner peripheral eyelet 18c. The outer peripheral portion of the seal lip 18a is sandwiched between the outer peripheral eyelet 18b and the inner peripheral eyelet 18c. The inner peripheral surface of the seal lip 18a is in close contact with and slides on the outer peripheral surface of the output shaft 11 . According to the structure as described above, the waterproof function of the per...

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Abstract

This electric power steering device is provided with: a motor housing that accommodates therein a motor constituting member and has a waterproof function; and a control unit case that accommodates therein a control device constituting member and has a waterproof function, wherein the output shaft of the motor extends to the outside of the motor housing while maintaining the waterproof function, and is provided with a respiratory device that performs a respiration function on the basis of the pressure variation inside the motor housing.

Description

technical field [0001] This application relates to an electric power steering device in which an electric motor and a control unit are integrated. Background technique [0002] As is well known, an electric power steering system is configured such that an electric motor generates an assist torque corresponding to the steering torque applied by the driver of the vehicle to the steering shaft to assist the driver's steering. Considering that the electric power steering device is installed in the vicinity of the rack shaft outside the vehicle compartment, not only the waterproof measures for the motor itself and the control unit itself, but also the connection between the motor and the control unit are required. Waterproofing measures are necessary. Conventionally, measures such as applying a sealant or installing an O-ring to the junction of the motor and the control unit have been taken as measures against waterproofing at the junction. [0003] In addition, the electric po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B62D5/04
CPCB62D5/04B62D5/0403H02K5/10B62D3/126B62D5/0406B62D5/0424
Inventor 大西善彦浅尾淑人
Owner MITSUBISHI ELECTRIC CORP
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