Belt speed reducer for electric power steering device and electric power steering device

A technology of electric power steering and deceleration device, applied in the direction of electric steering mechanism, etc., can solve the problems of belt tension fluctuation and adverse effect on the performance of electric power steering device, and achieve the effect of improving durability, reducing friction noise and loss, and reducing friction noise.

Inactive Publication Date: 2006-06-07
NSK LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the elastic body is not used, due to the difference, the tension of the belt fluctuates greatly according

Method used

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  • Belt speed reducer for electric power steering device and electric power steering device
  • Belt speed reducer for electric power steering device and electric power steering device
  • Belt speed reducer for electric power steering device and electric power steering device

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0165] First, refer to Figure 1 to Figure 4 A belt speed reduction device for an electric power steering device and an electric power steering device according to a first embodiment of the present invention will be described in detail.

[0166] The electric power steering device 10 of the first embodiment includes a cover 11 , a rack shaft 12 , a belt reduction gear 13 , a vehicle body mounting portion 14 , a pinion portion 15 , and an auxiliary motor 16 .

[0167] The cover 11 is divided into two substantially at the center, and has a bisected structure composed of a right cover 17 and a left cover 18 . The rack shaft 12 is supported by the cover 11, and is movable in the axial direction within the cover 11, but is prevented from rotating. Both ends of the rack shaft 12 protrude from both ends of the cover 11 . A body-side steering mechanism for changing the direction of the wheels, such as a tie rod, is connected to both ends. The protruding parts are respectively covere...

no. 2 example

[0178] Second, refer to Figure 5 and Figure 6 An electric power steering apparatus according to a second embodiment of the present invention will be described. In addition, in this embodiment, a gear reduction mechanism using helical gears is employed.

[0179] In the electric power steering device 40 of the second embodiment, an assist motor 41 has a stator 42 and a rotor 43 , and an extension 45 is fixed to one end of a motor shaft 44 fixed to the rotor 43 . The extension 45 of the motor shaft 44 is supported by a bearing 47 held by a motor flange 46 , and the other end of the motor shaft 44 is supported by a bearing 49 held by a motor cover 48 , so that the motor shaft 44 is rotatably supported.

[0180] In order to avoid interference between the motor cover 48 and the rack shaft cover 50 , the distance between the shaft centers of the input gear 51 and the output gear 52 is increased, and the input gear 51 and the output gear 52 are meshed through the intermediate gear...

no. 3 example

[0193] Second, refer to Figure 7 An electric power steering apparatus according to a third embodiment of the present invention will be described. Also, in this embodiment, a gear reduction mechanism using helical gears is employed. Additionally, along the Figure 7 Sectional view of line VI-VI with Figure 6 The shown figures are the same, so illustration is omitted.

[0194] The difference between the third embodiment and the second embodiment is: the motor shaft 44 and the input gear 51 are integrated, and are held by three bearings 49, 47 and 59; The inner ring of the bearing 59 is pressed to apply preload to the bearing 47 and the bearing 59 to prevent vibration in the axial direction. Since other structures are the same as those of the second embodiment, the same symbols are used for the same components, and detailed descriptions are omitted.

[0195] In the electric power steering device 90 of the third embodiment, the adjustment of the backlash is also the same as...

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PUM

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Abstract

A belt deceleration device for an electric power steering device, comprising: a driving pulley with a first helical tooth, a driven pulley with a second helical tooth, a driving belt with a third helical tooth, at the twist angle of each helical tooth Between β and the coefficient of friction μ between the first or second helical teeth and the third helical teeth, a relationship of tan β<μ is maintained. In addition, in the electric power steering device, the backlash adjustment between the gears meshing in the speed reduction device, or the adjustment of the belt tension of the speed reduction device is performed.

Description

technical field [0001] The present invention relates to a belt deceleration device for an electric power steering device and an electric power steering device. Background technique [0002] An electric power steering device for a vehicle is known that reduces the rotational output of an electric motor through a speed reduction mechanism and assists a steering operation as a steering assist force. [0003] For example, in Figure 41 In the electric power steering device 500 shown, a steering wheel shaft 501 and a rack shaft 502 are meshed through a well-known rack mechanism 503 . In addition, a motor shaft 505 of the motor 504 is rotatably supported by bearings 506 and 507 . [0004] A male thread portion (spiral groove) 508 is formed on the rack shaft 502 , and a nut 510 rotatably supported by a bearing 509 is arranged outside the rack shaft 502 , and a ball is inserted between the male thread portion 508 of the rack shaft 502 and the nut 510 511 constitutes a ball screw m...

Claims

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Application Information

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IPC IPC(8): B62D5/04
Inventor 上野星治力石一穗
Owner NSK LTD
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