Design method for cam mechanism used for foundation braking device
A basic braking device and cam mechanism technology, applied in the direction of brake actuator, gear transmission mechanism, mechanical equipment, etc., can solve the problems of large error and inability to use, achieve accurate derivation, convenient application, and solve the problem of parametric design and Drawing tedious effects
Active Publication Date: 2015-07-01
CRRC CHANGZHOU TECH MARK IND CO LTD +1
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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.
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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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The invention relates to a design method for a cam mechanism used for a foundation braking device. The design method includes: A, analyzing a running process and a force bearing status of the cam mechanism to obtain a computation model of braking leverage a of the foundation braking device; B, obtaining a coordinate equation of a theoretical profile line of a cam by an analytical method; C, obtaining a coordinate equation of an actual profile line of the cam by the analytical method; D, determining values of the a and an s, substituting the computation model into the coordinate equation to solve and drawing a profile of the cam; E, processing and manufacturing the cam according to the drawn profile of the cam. The design method for the cam mechanism used for the foundation braking device has the advantages that the computation model for the profile of the cam and the braking leverage is established, the profile of the cam in appointed breaking leverage can be solved and drawn accurately and reliably, and the braking leverage at any point on the profile of the cam is enabled to be 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 ...
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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