Title:
MASTER CYLINDER UNIT
Document Type and Number:
Japanese Patent JP2021066322
Kind Code:
A
Abstract:
To prevent a cup seal from bulging toward a relief port side and improve durability.SOLUTION: A relief port 6a drilled in a piston 6 inserted in a cylinder chamber 4 of a cylinder body 2a so as to reciprocate in a front-back direction to the cylinder chamber is inclined from an outer circumference to an inner circumference of the piston 6 at a predetermined angle θ from the front side to the back side in a moving direction. Thus, when brake fluid stored in a reservoir tank 3 is suctioned through the relief port 6a into the hydraulic chamber 4, the brake fluid collides against an inner wall of the relief port 6a and a fluid pool portion A is generated between an exposure portion 13a of a P.P cup 13 and the relief port 6a. Accordingly, bulging of the exposure portion 13a toward the relief port 6a is prevented by the fluid pool portion A.SELECTED DRAWING: Figure 3
Inventors:
ANDO YUSUKE
YOSHIO NAOZUMI
YOSHIO NAOZUMI
Application Number:
JP2019193211A
Publication Date:
April 30, 2021
Filing Date:
October 24, 2019
Export Citation:
Assignee:
SUBARU CORP
International Classes:
B60T11/236; B60T11/20; B60T11/232; F16J15/18; F16J15/3204; F16J15/3236
Domestic Patent References:
| JP2017177835A | 2017-10-05 |
Foreign References:
| FR2989045A1 | 2013-10-11 |
Attorney, Agent or Firm:
Patent Business Corporation Itoshin International Patent Office