Special device for detecting VL-type universal joint inner star wheel raceway pitch diameter and detection method

Abstract

The invention belongs to the special tool machining detection design technology field and discloses a special device for detecting a VL-type universal joint inner star wheel raceway pitch diameter. The device comprises a foundation part, a fixed steel ball part, a movable steel ball part and a pitch diameter proofing block used for setting a reading reference of an indicating gauge, wherein the three parts are arranged in a 180 DEG mode, a fixed steel ball of the fixed steel ball part is in matching with a raceway of an inner star wheel, a movable ball seat of the movable steel ball part is internally provided with a movable shaft, a front end of the moveable shaft is provided with a movable steel ball, the movable steel ball is matched in the corresponding raceway of the inner star wheel in an optimal matching state by the movable shaft through utilizing a compression spring, and the indicating gauge contacting with the movable shaft displays a measurement value. The invention further discloses a pitch diameter detection principle and a pitch diameter detection method. According to the device and the method, a three-coordinate instrument in a lab is innovatively changed into a special detection tool for a production filed, the measurement and determination method is simple, the detection speed is fast, and skill requirements for detectors are low.

Description

technical field [0001] The invention belongs to the technical field of special tooling design for mechanical processing and detection, in particular to a special detection device and a detection method for the pitch circle diameter of a star wheel raceway in a VL-type universal joint. Background technique [0002] See attached figure 1 The star sleeve 104 (also known as the inner star wheel) of the telescopic ball cage type constant velocity (also called VL type) universal joint is connected with the drive shaft 105 by splines, and its outer surface has six cylindrical grooves to form an inner raceway. The inner surface of the cylindrical shell 101 has corresponding six cylindrical grooves to form the outer raceway. The centerlines of these raceways are not parallel to the axis, but are inclined relative to the axis at the same angle, and the inclination directions of two adjacent raceways on the same part are opposite, that is, a "V" shape. After assembly, the inclinatio...

AI Technical Summary

Problems solved by technology

The six raceways are evenly distributed only on the system plane BB, and the diameter of the circle formed by the centers of the six raceways is the pitch circle diameter. There is a unique difference between the system plane BB and the system plane of the cylindrical shell and the ball cage. The assembly relationship ensures that the angular velocity at both ends changes evenly. It is a virtual plane, and its related dimensions cannot be directly measured; at the same time, the pitch circle is composed of six raceway centers. It is also a virtual circle, and its diameter cannot be directly measured.

However, the equipment is expensive; the requirements for the environment (temperature and humidity) are high; special programming is required, and the requirements for operators are high; the detection time is long, and it cannot be applied to the rapid measurement application in the production site environment

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