Demand type power brake system
US4398389A · kind A · utility
15Cited by
4References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 23, 1981 |
| Grant date | Aug 16, 1983 |
| Priority date | — |
| Expiry date | Mar 23, 2001 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T13/745
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A hydraulic power brake system has a pump driven through a variable torque magnetic clutch by an engine-drive pulley. A rheostat controlled by movement of the brake booster push rod varies the amount of current to the clutch to control the torque transmitted to the pump. The pump pressure output varies directly with clutch torque. Pump pressure is delivered to a closed center hydraulic booster. The pump does not operate when no braking effort is required.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.