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Design Method of Cam Mechanism Used in Foundation Braking Device

A basic braking device, cam mechanism technology, applied in the direction of brake actuator, gear shifting mechanism, mechanical equipment, etc., can solve problems such as large error and inability to use, achieve accurate derivation, convenient use, and solve parametric design and Drawing tedious effects

Active Publication Date: 2017-07-14
CRRC CHANGZHOU TECH MARK IND CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cam with a braking ratio of 3.1 at the time of design was made into a sample according to the technical solution published in the above patent documents. The measured braking ratio was 3.8, with a large error. It can be seen that this design method has defects and cannot be used.

Method used

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  • Design Method of Cam Mechanism Used in Foundation Braking Device
  • Design Method of Cam Mechanism Used in Foundation Braking Device
  • Design Method of Cam Mechanism Used in Foundation Braking Device

Examples

Experimental program
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Embodiment 1

[0041] See figure 1 , The foundation braking device of the present invention includes a brake shoe 1, a main shaft return spring 2 and a cam mechanism. The cam mechanism comprises a push rod 3, a roller 4, a piston pin 5, a cam pin 6, a cam 7, a piston return spring 8 and a piston 9. The center of rotation of the cam 7 is hinged with the shell of the basic braking device through the cam pin 6, and the leg of the piston 9 is hinged with the edge of the cam 7 through the piston pin 5. One end of the push rod 3 is connected to the roller 4 in rotation, and the other end of the push rod 3 One end is connected with brake shoe 1. Roller 4 is in contact with the outer edge profile of cam 7 . The axis of the piston pin 5 is the point of action of the piston 9 . The axis of the cam pin 6 is the center of rotation of the cam 7 .

[0042] See figure 2 and image 3 , the design method of the cam mechanism that is used for foundation braking device of the present invention, comprise...

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Abstract

The invention relates to a design method of a cam mechanism used for a foundation braking device, comprising the following specific steps: A. Analyzing the motion process and stress situation of the cam mechanism to obtain the calculation of the braking ratio a of the foundation braking device Model; B. Obtain the coordinate equation of the theoretical contour line of the cam by the analytical method; C. Obtain the coordinate equation of the actual contour line of the cam by the analytical method; D. Determine the values ​​of a and s, substitute the calculation model into the coordinate equation, and solve the problem And draw the outline of the cam; E. Manufacture the cam according to the drawn cam outline. The design method of the cam mechanism used for the basic braking device of the present invention establishes the calculation model of the cam profile and the braking magnification, and can accurately and reliably solve and draw the cam profile of the specified braking magnification, so that any point on the cam profile The braking ratio is constant.

Description

technical field [0001] The invention relates to a design method of a cam mechanism, in particular to a design method of a cam amplification mechanism of a rail transit vehicle foundation braking device. Background technique [0002] With the continuous improvement of the power and running speed of rail transit vehicles, the basic braking device must be required to output a large braking force to ensure that the train can stop within the specified braking distance during emergency braking. At present, there are mainly three types of force amplifying mechanisms of the basic braking device: lever, wedge-shaped slider, and cam push rod. The basic braking device with a cam push rod structure has the advantages of compact structure, high braking efficiency, and wide coverage of braking ratios, and is the most widely used in China. [0003] The structure of one of the basic brake devices using the cam push rod structure, such as figure 1 Shown is a typical eccentric cam push rod ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16D65/18F16D121/14F16D125/28
Inventor 伍安旭江浪苟青炳杜利清
Owner CRRC CHANGZHOU TECH MARK IND CO LTD