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Why Is Camshaft Wear Less Than Crankshaft Wear?

2022-02-11

The crankshaft journal and bearing bush are severely worn, and it is normal for the camshaft journal to be slightly worn.

A brief list is as follows:

1. The relationship between crankshaft speed and camshaft speed is generally 2:1, the crankshaft speed is 6000rpm, and the camshaft speed is only 3000rpm;

2. The working conditions of the crankshaft are even worse. The crankshaft needs to accept the force transmitted by the reciprocating motion of the piston, convert it into torque, and drive the vehicle to move. The camshaft is driven by the crankshaft and drives the valve to open and close. The strength is different.

3. The crankshaft journal has bearing pads, and the camshaft journal has no bearing pads; the clearance between the crankshaft journal and the hole is generally smaller than that of the camshaft journal and the hole. It can also be seen that the environment of the crankshaft journal is even worse.


Therefore, it is understandable that the crankshaft is severely worn and the camshaft journal is slightly worn.

Because I haven't seen any pictures of serious wear, I can only briefly talk about the possible reasons. For example, the coaxiality of the main bearing cap is not good, resulting in abnormal wear of the journal and the bearing bush; the oil pressure is low, and there is not enough oil film on the journal, which may also wear abnormally.