Hydraulically actuated piston with an air bleed
US6305521A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 24, 2000 |
| Grant date | Oct 23, 2001 |
| Priority date | — |
| Expiry date | Apr 24, 2020 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16D2500/1026
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A torque transmitting mechanism has a hydraulically actuated piston that is slidably disposed in a cavity. An apply chamber, formed by the piston and cavity, is filled with hydraulic fluid when the torque transmitting mechanism is to be engaged. One or more gas permeable--liquid impermeable mats are secured in a passage between the chamber and a non-liquid area in a transmission. During initial engagement of the torque transmitting mechanism, any entrapped air is forced out of the chamber through the mat while the leakage of liquid is inhibited. In a rotating torque transmitting mechanism (clutch), the mats are installed near the innermost periphery of the chamber. In a stationary torque transmitting mechanism (brake) the mats are installed near the top outermost periphery of the chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.