Hitachi Automotive Systems, Ltd.

Nissan Motor Company Limited

Ryoichi Yagi

Naganori Koshimizu

Masami Abe

Takato Ogiwara

Hideaki Ishii

Kazumoto Sano

Hiroshi Shigeta

Naoki Shirakawa

Ryozo Ikeuchi

Hiroshi Shimura

Masayuki Yoshimoto

Ryo Sekiya

Provided is a reservoir in which an inlet for injecting a liquid from the outside into a reservoir chamber in which the liquid is stored is provided at one side of a vehicle, a communication path that extends from the inlet toward the other side of the vehicle is provided, and a communication opening that is capable of making communication between the communication path and the reservoir chamber is formed. A surface part that gets higher from one side of the vehicle toward the communication opening of the other side of the vehicle in a state in which the reservoir chamber is mounted in the vehicle is formed at an upper portion of the reservoir chamber.

Reservoir

In an electric motor-driven booster, a sharp change of reaction force to an operation of a brake pedal is reduced to improve the brake pedal operation feeling. Operation of the brake pedal causes an input rod () and an input piston () to advance, and an electric motor () is driven according to the movement of the input piston to propel a primary piston () through a ball-screw mechanism, thereby generating a desired brake hydraulic pressure in a master cylinder. At this time, the input piston receives the hydraulic pressure in the master cylinder to feed back a part of reaction force during braking to the brake pedal. When the brake pedal is further depressed after the output of the electric motor has reached a maximum output and the primary pistonhas stopped, a lock nut abuts against a movable spring retainer and compresses a reaction force spring.

Electric motor-driven booster

A master cylinder includes a cylinder body which an operating fluid is introduced from a reservoir, a piston which is slidably fitted in the cylinder body and defines a pressure chamber inside the cylinder body, a supply pathway which is formed in the cylinder body and supplies the operating fluid from the reservoir to the pressure chamber, a bypass pathway which bypasses the supply pathway and allows the reservoir to communicate with the pressure chamber, and a check valve which is installed in the bypass pathway and opens a valve when the pressure inside the pressure chamber is lower than the pressure of the reservoir.

Master cylinder

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Minami-Alps, Japan

Ryoichi Yagi