The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 14, 2017
Filed:
Oct. 24, 2011
Masayuki Yoshimoto, Kanagawa, JP;
Ryozo Ikeuchi, Kanagawa, JP;
Ryo Sekiya, Kanagawa, JP;
Hideaki Ishii, Kanagawa, JP;
Kazumoto Sano, Kanagawa, JP;
Hiroshi Shigeta, Kanagawa, JP;
Naoki Shirakawa, Kanagawa, JP;
Ryoichi Yagi, Kanagawa, JP;
Masami Abe, Kanagawa, JP;
Masayuki Yoshimoto, Kanagawa, JP;
Ryozo Ikeuchi, Kanagawa, JP;
Ryo Sekiya, Kanagawa, JP;
Hideaki Ishii, Kanagawa, JP;
Kazumoto Sano, Kanagawa, JP;
Hiroshi Shigeta, Kanagawa, JP;
Naoki Shirakawa, Kanagawa, JP;
Ryoichi Yagi, Kanagawa, JP;
Masami Abe, Kanagawa, JP;
NISSAN MOTOR CO., LTD., Kanagawa, JP;
HITACHI AUTOMOTIVE SYSTEMS, LTD., Ibaraki, JP;
Abstract
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.