For the connecting rod of the crank connecting rod mechanism, the outer hole of the connecting rod and the outer circle of the tin bronze bushing (commonly known as the small head tile) are defined as an interference fit DH7/r6; the inner hole of the bushing is connected with the steel The fit of the rod pin is the clearance fit dH7/f6 in a moderate temperature (about 20 ° C ~ 30 ° C) environment, the bushing is pressed
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