HYDRAULIC MASTER CYLINDER FOR VEHICLE

• Main Authors: UEHARA KAZUMA, SAKAI TAKESHI
• Format: Patent
• Language: English; Japanese
• Published: 01.12.2016
• Subjects: ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; BLASTING; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; BRAKES SPECIALLY ADAPTED FOR CYCLES; CYLINDERS; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS; LIGHTING; MECHANICAL ENGINEERING; PERFORMING OPERATIONS; PISTONS; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OFVEHICLES; SEALINGS; THERMAL INSULATION IN GENERAL; TRANSPORTING; VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES; VEHICLES IN GENERAL; WEAPONS

PROBLEM TO BE SOLVED: To provide a hydraulic master cylinder for a vehicle including a secondary cup seal which secures vacuum retention power while suppressing slide resistance to a lower level.SOLUTION: A secondary cup seal 17 includes a base part 17b, a seal groove bottom wall side lip part 17c, a slide side lip part 17d, and an intermediate lip part 17e. A first peripheral groove 17f is formed between the seal groove bottom wall side lip part 17c and the intermediate lip part 17e, and a second peripheral groove 17g is formed between the slide side lip part 17d and the intermediate lip part 17e. A cutout part 17h is formed at a tip of the intermediate lip part 17e. A length dimension E from a base end surface 17a of the base part 17b to a bottom part of the first peripheral groove 17f is formed so as to be longer than a length dimension C from the base end surface 17a to a bottom part of the second peripheral groove 17g.SELECTED DRAWING: Figure 3 【課題】摺動抵抗を低く抑えながら、真空保持力を確保することができるセカンダリカップシールを備えた車両用液圧マスタシリンダを提供する。【解決手段】セカンダリカップシール１７は、基部１７ｂとシール溝底壁側リップ部１７ｃと摺動側リップ部１７ｄと中間リップ部１７ｅとを備え、シール溝底壁側リップ部１７ｃと中間リップ部１７ｅとの間に第１周溝１７ｆを、摺動側リップ部１７ｄと中間リップ部１７ｅとの間に第２周溝１７ｇをそれぞれ形成し、中間リップ部１７ｅの先端に切欠き部１７ｈを形成する。基部１７ｂの基端面１７ａから第１周溝１７ｆの底部までの長さ寸法Ｅを、基端面１７ａから第２周溝１７ｇの底部までの長さ寸法Ｃよりも長く形成する。【選択図】 図３