A method for digitally design the tooth profile of a rack and pinion pair of a mechanical ratio variable steering gear

A design method, rack and tooth technology, applied in mechanical equipment, electrical digital data processing, design optimization/simulation, etc., can solve the problems of calculation step limitation, large design error, low design accuracy, etc., and achieve no principle error , to achieve the effect of digital solution

Active Publication Date: 2018-12-11
WUHAN UNIV OF TECH
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  • Description
  • Claims
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Problems solved by technology

The traditional Fancheng simulation design method, although the design process is relatively simple and the degree of parameterization is high, but the calculation step is limited, the design accuracy is not high, and subsequent surface fitting is required, resulting in large design errors

Method used

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  • A method for digitally design the tooth profile of a rack and pinion pair of a mechanical ratio variable steering gear
  • A method for digitally design the tooth profile of a rack and pinion pair of a mechanical ratio variable steering gear
  • A method for digitally design the tooth profile of a rack and pinion pair of a mechanical ratio variable steering gear

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Embodiment Construction

[0028] In order to better understand the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0029] Such as figure 1 , figure 2 As shown, the present invention includes the following steps: S1: calculation step of basic design parameters; S2: step of determining section; S3: step of selecting gear angle; S4: calculating meshing equation; ; S6: the step of finding the point cloud of the transformation ratio rack transition surface; S7: the step of perfecting the tooth shape; S8: the step of solving the tooth profile of the selected section rack; S9: the step of solving the tooth profile of the entire rack.

[0030] The meshing equation is:

[0031]

[0032] where r b is the radius of the base circle, σ 0 It is related to the parameters of the involute gear, and its magnitude is σ 0 = π / 2z-invα 1′ , z is the number of gear teeth; invα 1′ is the involute polar coordinate function, inv...

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Abstract

A method for digitally designing the tooth profile of a rack and pinion pair of a mechanical ratio-changing steering gear is provided. The gear profile of the standard gear sector and the gear pair transmission ratio are known, the variable ratio rack tooth profile is designed for meshing transmission with known standard gears and satisfying the transmission ratio law, through deduction of the working tooth surface equation, the transition surface equation and the meshing equation of the variable ratio rack, the working tooth surface point cloud and the transition surface point cloud of the variable ratio rack are calculated, and finally the tooth profile is perfected to obtain the whole rack tooth profile point. The method comprises the following steps: S1, calculating basic design parameters; S2, determining a section; S3, selecting the rotation angle of the gear; s4, calculating that meshing equation; S5, obtaining the working tooth surface point cloud of the change ratio rack; S6,obtaining the transition curved surface point cloud of the change ratio rack; S7, perfecting the tooth profile; S8, solving the tooth profile of a rack with a selected cross section; S9, solving the entire rack tooth profile. The invention does not adopt the generation simulation principle, avoiding many problems of the traditional method.

Description

technical field [0001] The invention belongs to the technical field of mechanical transmission, and in particular relates to a digital design method for gear pair rack tooth profile of a mechanical variable ratio steering gear. Background technique [0002] In order to improve the steering performance of the mechanical steering gear, the rack and pinion can be meshed and driven according to the proposed variable transmission ratio. In the design of the gear pair of the mechanical variable ratio steering gear, the gear is generally set to a standard involute tooth shape, and the tooth shape parameters are known, while the tooth profile of the variable ratio rack is unknown. In order to manufacture and perform performance analysis on the gear pair of the mechanical variable ratio steering gear, the tooth profile of the variable ratio rack must be designed. The traditional Fancheng simulation design method, although the design process is relatively simple and the degree of par...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50F16H55/26F16H55/08
CPCF16H55/08F16H55/26G06F30/17G06F30/20
Inventor 胡剑李苇白李刚炎范伟
Owner WUHAN UNIV OF TECH
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