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Electric motors for power steering equipment of vehicles

A technology of electric motors and power steering, which is applied in the direction of electric components, electrical components, electromechanical devices, etc., and can solve problems such as unfavorable penetration

Active Publication Date: 2018-06-01
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the expansion and contraction of parts caused by temperature changes occurs repeatedly, although water does not permeate into the inside of the electric motor immediately, the water passes through the boundary between adjacent two parts of the electric motor, disadvantageously. Penetrates into the interior of the electric motor

Method used

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  • Electric motors for power steering equipment of vehicles
  • Electric motors for power steering equipment of vehicles
  • Electric motors for power steering equipment of vehicles

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0023] The electric motor of the first embodiment of the present disclosure is used as figure 1 The drive source of the power steering device 97 of the vehicle shown in . A power steering device 97 is provided in the steering system 90 . The steering system 90 is a system that drives wheels 91 to change the traveling direction of the vehicle. The steering system 90 includes a steering wheel 92 , a steering shaft 93 , a rack and pinion mechanism 94 and tie rods 95 . Rotary motion transmitted from steering wheel 92 to steering shaft 93 is converted to linear motion by rack and pinion mechanism 94 and then transmitted to wheels 91 to change the orientation of wheels 91 . The power steering device 97 is a device that assists the steering operation of the driver of the vehicle.

[0024] The power steering apparatus 97 includes an electric motor (hereinafter simply referred to as a motor) 10 , a reduction gear 98 and an electronic control unit (ECU) 99 . The reduction device 98 ...

no. 2 approach

[0052] In the second embodiment of the present disclosure, as Figure 7 As shown in , the radially outer portion of one end portion of the yoke portion 51 on the first frame end 15 side is axially disposed on the second frame end 16 side of the radially inner portion of one end portion of the yoke portion 51 And thus the stepped portion 52 is formed. The first end contact portion 41 is fitted to the stepped portion 52 . As discussed above, by fitting the first end contact portion 41 to the stepped portion 52 , the first frame end 15 and the stator core 13 can be effectively positioned relative to each other in the radial direction.

[0053] Further, the radially outer portion of the other end portion of the yoke portion 51 on the second frame end 16 side is axially disposed on the first frame end 15 side of the radially inner portion of the other end portion of the yoke portion 51 and thus formed Stepped portion 53 . The second end contact portion 42 is fitted to the steppe...

no. 3 approach

[0055] In the third embodiment of the present disclosure, as Figure 8 As shown in , the outer wall surface 56 of the inner tubular portion 55 is a tapered surface. That is, the protrusion 57 of the second frame end 16 is shaped such that the wall thickness of the protrusion 57 measured in the radial direction increases from the distal end to the proximal end of the protrusion 57 . Therefore, the required rigidity of the protruding portion 57 is ensured.

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PUM

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Abstract

A first end contact portion of a first frame end contacts one end surface of a stator core. A second end contact portion of a second frame end contacts the other end surface of the stator core and includes an inner tubular part, which contacts the other end surface of the stator core, and a fixing part, which projects radially outward from the inner tubular part and contacts the other end surface. A through-bolt is threaded into the fixing part. An outer diameter of the one end surface is smaller than an outer diameter of an opposing surface of the first end contact portion. An outer diameter of an opposing surface of the inner tubular part is smaller than an outer diameter of the other end surface. A yoke of the stator core includes a relief groove, into which a portion of the through-bolt is fitted.

Description

technical field [0001] The present disclosure relates to an electric motor used as a drive source of a power steering apparatus of a vehicle. Background technique [0002] For example, JP2014-107916A discloses an electric motor in which a stator core is held axially between two frame ends. These frame ends are fastened together by fixing elements, such as bolts, so as to dispense with a housing covering the outside of the stator core. By omitting the housing, the number of parts and the number of assembly steps can advantageously be reduced. [0003] In the case where the electric motor described above is used as a drive source of a power steering apparatus of a vehicle, it may not be necessary to provide a complete waterproof function depending on the installation position of the electric motor in the vehicle. Therefore, it is desired to simplify the structure of the electric motor by omitting the waterproof function and to manufacture the electric motor at a lower cost. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K1/16H02K1/18H02K5/10
CPCH02K1/16H02K1/185H02K5/10H02K5/15H02K5/04
Inventor 立石祐介
Owner DENSO CORP