Patent ID: 9726285
Date: 2017-08-08
CPC Classifications: B23P,B60T,F16J,Y10T

Claim:
1. A piston push-rod assembly in which a piston for a master cylinder is connected to a push rod, the piston push-rod assembly comprising: the push rod; a brake piston comprising a piston sliding portion which is configured to be contained in a cylinder bore formed inside of a brake master cylinder and to slide relative to the cylinder, the brake piston further comprising a tubular connection portion which is integrally formed with the piston sliding portion and operatively connected to the push rod, the tubular connection portion having a diameter smaller than the piston sliding portion; wherein: the piston sliding portion is coated with plating, and the tubular connection portion includes an unplated portion which engages an end portion of the push rod, and the plating is arranged on an area extending inwardly from an outer circumferential surface of the piston sliding portion on to a connection surface connecting the outer circumferential surface of the piston sliding portion and an outer circumferential surface of the tubular connection portion, whereby the plating is provided on both sliding and selected non-sliding surfaces of the brake piston.