Hydraulic brake mechanism

摘要

A hydraulic brake mechanism is described including a housing. A master cylinder assembly is disposed within the housing, and the master cylinder assembly includes a fluid chamber. The fluid chamber includes a first chamber portion having a first diameter and a second chamber portion having a second diameter, with the first diameter greater than the second diameter. The fluid chamber includes a transition region between the first and second chamber portions. The mechanism includes a piston assembly having a piston disposed within the fluid chamber. A first seal is configured to sealingly engage between the first chamber portion and the piston, and a second seal is configured to sealingly engage between the second chamber portion and the piston. The mechanism includes an outlet port extending from the fluid chamber from or adjacent the transition region.

主权项

1. A hydraulic brake mechanism mountable to a bicycle handlebar, the brake mechanism comprising:
a housing having a base portion and an extension portion, the base portion including first and second ends, the base portion including a handlebar clamp at the first end, the base portion extending generally horizontally and the extension portion extending forwardly of the base portion at the second end and angled generally upwardly from the base portion when the hydraulic brake mechanism is mounted to the bicycle handlebar, the housing sized and shaped to be grasped by a user's hand; a fluid chamber; a piston movably disposed within the fluid chamber; a lever pivotally disposed at the second end of the base portion, the lever operatively connected to the piston to slidably displace the piston within the fluid chamber; a fluid reservoir in fluid communication with the fluid chamber; and a bleed port in fluid communication with the fluid reservoir.