What is the standard size of a Type A pulley groove?
2 Answers
A-type V-belt cross-sectional dimensions are: top width 13mm, thickness 8mm. Below is a partial introduction about timing belts: 1. Definition: The timing belt (Timing-belt) is an important component of the engine's valve system. By connecting with the crankshaft and maintaining a specific transmission ratio, it ensures accurate intake and exhaust timing. 2. Function: The timing belt serves as a crucial link. The upper connection is to the timing pulley on the engine cylinder head, while the lower connection is to the crankshaft's timing pulley. The timing pulley is connected to the camshaft, which has cams that contact small rocker arms. The rocker arms generate pressure through the power transmitted by the timing belt, performing a lifting function.
As a seasoned auto mechanic with 20 years of experience, I can confirm that Type A pulley grooves have fixed standards: typically, the groove depth ranges between 12.5 to 14 millimeters, the top width is about 13 millimeters, and the bottom width is slightly narrower than the belt cross-section, approximately 10.5 millimeters. The sides are designed with a 34-degree angle to ensure the Type A V-belt fits snugly without slipping. During installation, special attention must be paid to ensuring the groove bottom is free of burrs, as they can cause premature belt wear. I've also noticed that some older domestic vehicle pulley grooves might be about half a millimeter shallower, so it's crucial to measure the groove depth when replacing the belt to prevent belt detachment and subsequent engine failure. Additionally, if the groove wear exceeds 1 millimeter, the pulley should be replaced immediately; otherwise, the belt's lifespan will be halved.
