Implement for measuring pitch diameter of AAR three-pin shaft

Abstract

The invention discloses an implement for measuring the pitch diameter of an AAR three-pin shaft, which comprises a bottom plate, a movable measuring mechanism, a positioning mechanism, a reset mechanism and a length measuring mechanism, wherein the movable measuring mechanism comprises a first guide rail, a sliding plate and a measuring block, the first guide rail is connected with the bottom plate, the sliding plate can slide back and forth along the first guide rail, the measuring block is arranged at the front end of the sliding plate, three measuring heads which are positioned on the same spherical surface are arranged on the measuring block, and the spherical surface is consistent with the peripheral surface of a roller seat; the positioning mechanism is positioned at the front side of the movable measuring mechanism and is used for positioning the AAR three-pin shaft to be detected; the reset mechanism is positioned at the back side of the movable measuring mechanism and comprises a reset block, wherein the reset block is fixed on the bottom plate and is connected with the back end of the sliding plate through a reset spring; and the length measuring mechanism is connected with the back end of the sliding plate. The implement for measuring the pitch diameter of the AAR three-pin shaft is simple to use and convenient to operate and can quickly judge whether the pitch diameter of the AAR three-pin shaft is qualified or not, thereby meeting the requirement of mass production.

Description

technical field [0001] The invention relates to a checking tool, in particular to a checking tool for testing the pitch circle diameter of an AAR tripod shaft. Background technique [0002] As the key part of the constant velocity universal joint, the three-pin joint is an important part on the transmission shaft of the automobile. It is divided into AAR joint and GI joint according to its structure. The AAR section is composed of an AAR three-pin shaft and three rollers, such as figure 1 As shown, three roller seats 11 are arranged on the AAR three-pin shaft 1, and the rollers are located in the roller seats. 11 The diameter of the circle formed by the distance from the center of the sphere to the radius is called the pitch circle diameter (PCD) of the AAR tripod shaft. The size of the pitch circle diameter of the AAR three-pin shaft will directly affect the assembly of the rollers and the performance of the three-pin joint. Therefore, it is necessary to measure the pitch...

AI Technical Summary

Problems solved by technology

At present, the detection of the pitch circle size of the AAR three-pin shaft is generally measured by a three-coordinate measuring instrument, but the detection time required by this three-coordinate measuring instrument for measurement is long, which cannot meet the requirements of production speed, so in the production process. Only the first piece of AAR three-pin shaft can be tested, but not every AAR three-pin shaft in mass production, which will easily lead to an increase in the scrap rate of products in mass production and increase the production cost of the enterprise

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