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Rotating motors and electric power steering

A technology for rotating electrical machines and electric motors, applied in the direction of electric steering mechanisms, electromechanical devices, electric components, etc., can solve the problems of large volume and size of rotating electrical machines, and achieve reduced size, reduced volume and/or size, and high-precision coaxial The effect of positioning

Active Publication Date: 2017-06-09
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reinforced flanges may result in larger front and rear endshields resulting in larger bulk and / or dimensions for the rotating electrical machine

Method used

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  • Rotating motors and electric power steering
  • Rotating motors and electric power steering
  • Rotating motors and electric power steering

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach ）

[0023] figure 1 and figure 2 A first embodiment of the rotating electrical machine in the present disclosure is shown. The rotary electric machine 1 is driven by receiving electric power supply and is used in, for example, an electric power steering apparatus to assist a steering operation of a vehicle.

[0024] image 3 A system configuration of a steering system 100 having an electric power steering device 109 is shown. In an electric power steering device 109 , a torque sensor 104 is arranged on a steering shaft 102 and connected to a steering wheel 101 . The torque sensor 104 detects the steering torque input by the driver of the vehicle from the steering wheel 101 into the steering shaft 102 .

[0025] A pinion 106 is arranged on an end of the steering shaft 102 , and the pinion 106 is engaged with a rack shaft 107 . A pair of tires 108 are rotatably connected to both ends of the rack shaft 107 via tie rods or the like.

[0026] In this manner, when the driver of t...

no. 2 approach ）

[0057] Figure 4 and Figure 5 A second embodiment of the rotating electric machine in the present disclosure is shown.

[0058] refer to Figure 4 , the output rod 17 is substantially cylindrical in shape and is arranged coaxially on the first end of the shaft 15 . A plurality of grooves extending in the axial direction are formed on the outer wall of the output rod 17 . The output rod 17 and the input portion (not shown) of the reduction gear 103 are connected by a belt. The belt transmits the rotation of the rotor 14 to the reduction gear 103 .

[0059] A first bottom cover hole 41 , a second bottom cover hole 42 , and a third bottom cover hole 43 are formed on the three bottom cover flanges 24 . More specifically, the first bottom cover hole 41 , the second bottom cover hole 42 , and the third bottom cover hole 43 are formed at equidistant positions (ie, equiangular intervals) around the circumference of the bottom cover 20 with respect to the axial center O. The axi...

no. 3 approach ）

[0070] Figure 6 , Figure 7 ,as well as Figure 8 A third embodiment of the rotating electrical machine in the present disclosure is shown.

[0071] Such as Figures 6 to 8 As shown in , in this embodiment, a second bottom cover flange 26 and a first bottom cover flange 25 having a triangular shape are provided. The second bottom cover flange 26 is symmetrical and positioned along the centerline of the bottom cover 20 and on the outer periphery of the bottom cover 20 . In other words, each second bottom cover flange 26 is opposite the other second bottom cover flange 26 along the centerline (ie, located approximately 180° from each other). Accordingly, the first bottom cover flange 25 and the second bottom cover flange 26 are positioned at unequal angular intervals around the circumference of the bottom cover 20 .

[0072] The first bottom cover hole 41 is formed on the first bottom cover flange 25 . The second bottom cover hole 42 is formed on one of the second bottom ...

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Abstract

Provided are a rotary electric machine for driving a driving object and an electric power steering device driven by the rotary electric machine. The rotating electric machine includes a motor case, a stator, a winding, a rotor, a bottom cover, an end cover, an output rod, a bottom cover hole, an end cover hole, and through bolts. The bottom cover has a bottom cover flange formed on the peripheral edge and extending radially outward beyond the outer wall of the motor housing. The end cap has an end cap flange formed on the circumferential edge and extending radially outward beyond the outer wall of the motor housing. A bottom cap hole is formed in the bottom cap flange and an end cap hole axially aligned with the bottom cap hole is formed in the end cap flange. Through bolts secure the bottom cover flange to the end cover flange. Thereby, a compact high-output rotating electrical machine is provided.

Description

technical field [0001] The present disclosure generally relates to a rotary electric machine and an electric power steering device driven by the rotary electric machine. Background technique [0002] Generally, a rotary electric machine is used as a power assist source for an electric steering device. For example, a rotating electric machine of an electric power steering device described in Japanese Patent No. 4,679,783, a front end cover and a rear end cover respectively covering the front and rear ends of a tubular motor housing are fastened together by two through bolts. [0003] The electric rotating machine is constructed to have a structure including a flange of a front end cover and a flange of a rear end cover fastened together by two through bolts. Therefore, the axial force for tightening each of the two through bolts is greater than that of a similar structure with three or more bolts. Therefore, the through bolt must have a large outer diameter. In addition, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K5/04B62D5/04
CPCH02K5/15H02K7/116H02K11/33H02K5/04H02K11/0094
Inventor 瓜生信彦山崎雅志
Owner DENSO CORP
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