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A method for modifying the tooth profile of the rocker arm shaft tooth sector of an automobile steering gear

A technology of automobile steering gear and rocker shaft, which is applied in the field of mechanical transmission, can solve problems such as non-circular gear sector interference, and achieve flexible steering, stable straight-line driving, and broad prospects

Inactive Publication Date: 2018-06-29
HUBEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, the technical solution proposed in this paper is only to solve the interference problem in the machining of non-circular gear retraction with disc cutters, and does not involve the use of rack cutters to process non-circular gear sectors (there is no interference in the retraction) modification Interference problem in

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  • A method for modifying the tooth profile of the rocker arm shaft tooth sector of an automobile steering gear
  • A method for modifying the tooth profile of the rocker arm shaft tooth sector of an automobile steering gear
  • A method for modifying the tooth profile of the rocker arm shaft tooth sector of an automobile steering gear

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Embodiment Construction

[0034] The embodiments of the present invention will be further described below in conjunction with the accompanying drawings. Any modifications, equivalent replacements or improvements made within the spirit and principles of the present invention should be included within the scope of the claims of the present invention. Everything that is not mentioned in detail is known technology.

[0035] The invention discloses a method for modifying the tooth profile of a rocker arm shaft tooth sector of an automobile steering gear, comprising the following steps:

[0036] 1) Set the displacement function e(θ) used in the modification as:

[0037]

[0038] Reference attached figure 1 , in the above formula (1), e(θ) is a function of the rotation angle θ of the gear sector. where C 1 is the end angle of displacement, C 2 is the starting angle of displacement, e m is the maximum displacement. The function curve is divided into three segments, on both sides [-C 2 ,-C 1 ) and (C...

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Abstract

The invention discloses a tooth profile correcting method for an automobile steering device rockshaft gear sector. The method is a modification amount changing profile correcting method. Profile correcting is achieved through slotting machining, the modification amount of profile correcting is determined by three parameters including a modification start, a terminal angle and the maximal modification amount by adopting a ramp function related to gear sector rotating angles, and in the slotting machining process with a certain transmission ratio curve, a radial feed shaft retracts or feeds according to the law of motion of the ramp function to achieve profile correcting. By means of modification correcting within the range of the modification start and the terminal angle, tooth profiles of a certain section in the middle portion of the gear sector become thick, and the purpose that the back lash of an automobile steering device gear sector and rack pair is reduced or the purpose of backlash-free engaging is achieved. For the overcutting phenomenon in the profile correcting process, theoretical tooth profiles are calculated through a tooth profile normal method, and actual tooth profiles are calculated through an envelope line method. When the actual profile correcting amount does not conform to the theoretical profile correcting mount, the three parameters are adjusted, the actual profile correcting amount is calculated again until the actual profile correcting amount conforms to the theoretical profile correcting amount, and once the three parameters are adjusted, the three parameters are fixed and put on production.

Description

technical field [0001] The invention relates to a method for modifying the tooth profile of a rocker arm shaft tooth sector of an automobile steering gear, and belongs to the technical field of mechanical transmission. Background technique [0002] The steering performance of a car depends on the meshing performance of the steering gear rocker shaft, fan, rack, and gear pair. When driving in a straight line, the steering wheel is required to be "heavy" and stable; when steering, the steering wheel must be "light" and flexible. Although the driving performance of this car can be met through variable transmission ratio transmission, however, through the modification of the middle tooth profile of the rocker shaft gear fan, the middle tooth thickness is thicker, the backlash is smaller, and even the backlash-free meshing is obtained. The steering gear of the rocker shaft gear fan is more popular in the market. [0003] The idea of ​​gear displacement has been around for a long...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23F5/12
CPCB23F5/12
Inventor 丁国龙余金舫张雅丽赵大兴吴震宇
Owner HUBEI UNIV OF TECH
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