Hydro-pneumatic brake actuator arranged to maintain a constant brake shoe clearance
US4319671A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 2, 1980 |
| Grant date | Mar 16, 1982 |
| Priority date | — |
| Expiry date | Jun 2, 2000 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16D65/74
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A hydro-pneumatic brake actuator arranged with a slack adjuster piston and one-way check valve device in the hydraulic path between a hydro-pneumatic actuator and a power piston, to which a friction brake element is connected for engagement with a vehicle wheel tread or brake disc during a brake application. During a brake release, the one-way check valve closes a passage through the slack adjuster piston to cause the piston to shift from its one extreme position to the other extreme position with the fluid flow, as the hydro-pneumatic actuator is moved from its application position to its release position. This in turn draws hydraulic fluid from the power piston chamber into a clearance volume created by shifting of the slack adjuster piston, and accordingly forces the power piston to retract a predetermined distance corresponding to the capacity of the clearance volume and the effective area of the power piston, thereby maintaining a constant brake shoe clearance during brake release.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.