Electric motor-driven booster
US9108609B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 8, 2011 |
| Grant date | Aug 18, 2015 |
| Priority date | — |
| Expiry date | Apr 10, 2034 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T13/745
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
In normal braking, the operation of an electric motor is controlled according to the amount of operation of a brake pedal to drive a pressing member through a belt drive mechanism and a ball-screw mechanism, thereby pressing a piston to generate a fluid pressure in a master cylinder to obtain a braking force. A predetermined reaction force is applied to the brake pedal by a reaction force spring of a stroke simulator, and a gap is maintained between the pressing member and a movable member, thereby eliminating an uncomfortable feeling in a brake operation caused by fluid pressure variations in the master cylinder. When the electric motor fails, the movable member abuts against the pressing member and directly presses the piston to maintain the braking function. The rear end of the pressing member is inserted into a guide member and the reaction force spring to reduce the axial size.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.