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MASTER CYLINDER

  • US 20150246664A1
  • Filed: 03/27/2013
  • Published: 09/03/2015
  • Est. Priority Date: 10/31/2012
  • Status: Active Grant
First Claim
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1. A master cylinder comprising:

  • a cylinder main body in a bottomed cylindrical shape including an outlet of a brake liquid and a supply path which is in communication with a reservoir,a piston that is movably disposed in the cylinder main body and that is configured to form a pressure chamber which is capable of supplying a liquid pressure into the outlet between the cylinder main body and the piston, anda piston seal that is installed in a circumferential groove formed in the cylinder main body and that is configured to seal a space between the supply path and the pressure chamber by bringing an inner circumference in sliding contact with the piston,the piston seal comprising;

    an annular base portion;

    an inner circumferential lip portion protruding from an inner circumferential side of the base portion to come in sliding contact with an outer circumferential surface of the piston;

    an outer circumferential lip portion protruding from an outer circumferential side of the base portion to come in contact with the circumferential groove of the cylinder main body; and

    an intermediate protrusion portion protruding from between the inner circumferential lip portion and the outer circumferential lip portion of the base portion further than the outer circumferential lip portion,wherein a connecting portion is formed to extend in an axial direction of the piston seal and is configured to connect the inner circumferential lip portion and the intermediate protrusion portion is formed between the inner circumferential lip portion and the intermediate protrusion portion.

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