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Variable ratio rack and power steering gear

A rack and gear technology, applied in the field of power steering gear, can solve problems such as steering sticking and uneven transmission

Active Publication Date: 2015-03-11
HANGZHOU SHIBAO AUTO STEERING GEAR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the shortcomings of the power steering gear in the prior art that the transmission is not stable during the process of changing the transmission speed ratio, and the steering is prone to stagnation, and provides a variable ratio rack and power steering gear, which can to achieve a smooth transition during the

Method used

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  • Variable ratio rack and power steering gear

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A variable ratio rack, such as Figure 1-5 As shown, at least gear tooth I100 and gear tooth II200 adjacent to gear tooth I100 are included.

[0034] Such as figure 2 As shown, the gear teeth I100 and gear teeth II200 and the gears 300 meshed with them have different transmission speed ratios I min , I max The gear teeth I100 and the gear teeth II200 of the variable ratio rack have different tooth surface shapes, and after meshing with the gear teeth on the gear 300, they pass through the gear teeth I100 and After the gear teeth II200, the transmission speed ratio I is changed from I min smoothly transitions to I max , to realize the function of variable ratio.

[0035] In order to achieve the above function of smoothly changing the transmission speed ratio, the tooth surface 101 of the gear tooth I100 close to the gear tooth II200 has a structure so that the variable ratio rack and the gear 300 can be in the change range of the transmission speed ratio {I min ,...

Embodiment 2

[0050] A power steering gear is equipped with the power steering gear using the variable ratio rack described in Embodiment 1 and the gear matched with it.

[0051] As a preference, the power steering gear is a recirculating ball power steering gear.

[0052] Further experiments show that the power steering gear described in this embodiment, including the recirculating ball power steering gear, has extremely stable transmission and smooth speed change. Compared with the tooth surface shape obtained by other curves, it has the advantages of stable transmission and smooth steering.

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Abstract

The invention relates to a power steering component of a motor vehicle, and discloses a variable ratio rack. The rack at least comprises gear teeth I and gear teeth II adjacent to the gear teeth I, wherein the gear teeth I and the gear teeth II have different transmission gear ratios Imin and Imax with a gear engaged with the gear teeth I and the gear teeth I respectively; tooth surfaces, close to the gear teeth II, of the gear teeth I have such a tooth surface shape that the variable ratio rack and the gear can be in smooth transition in a change interval {Imin, Imax} of a transmission gear ratio I; the radial sections of the tooth surfaces are envelope lines which are obtained by moving the gear relative to the variable ratio rack according to a motion trail X. The variable ratio rack and the power steering gear have the advantages that the gear is in smooth transition between different transmission gear ratios and is stable in transmission and a blockage phenomenon in a variable ratio process can be eliminated better.

Description

technical field [0001] The invention relates to a power steering component of a motor vehicle, in particular to a variable ratio rack and a power steering gear using the variable ratio rack. Background technique [0002] The steering system of a truck is usually equipped with a recirculating ball power steering gear or other similar power steering devices to provide steering assistance during driving. The output shaft of the steering gear and the rack piston are driven by a gear and a rack. The output shaft is also called a rocker arm. There are usually only three teeth on the shaft, which are also called rocker shaft fan teeth. The currently commonly used design is the standard rack and pinion transmission. Although this design can transmit torque and mechanical movement, in actual use, it is required that the speed ratio should gradually increase with the increase of the rocker shaft rotation angle to meet the requirements of the automobile. It has good handling performan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B62D3/12
CPCB62D3/126
Inventor 任培付松邹理炎张宝义虞忠潮
Owner HANGZHOU SHIBAO AUTO STEERING GEAR
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