Fluid coupling device with improved modulation capability
US4633988A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 17, 1985 |
| Grant date | Jan 6, 1987 |
| Priority date | — |
| Expiry date | Jun 17, 2005 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16D35/023
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An improved fluid coupling device is disclosed of the type including modulating valving. The coupling device includes an input coupling member (11) and an output coupling member (13) which cooperate to define a plurality of annular lands (57 and 59). The input member defines a rearward surface (61) and the output member defines an adjacent surface (63), thus forming a bottom end clearance within the coupling. The input coupling member further defines an annular transverse surface (71) and a cylindrical surface (73) which cooperate to define an annular recess (75). As the air temperature is increasing, and the operating chamber (33) is being filled with fluid, the annular recess (75) prevents the bottom end clearance from filling with viscous fluid in a way which results in an undesirably rapid rate of increase of the speed of the output coupling member (13). As another feature of the present invention, the lands (57) defined by the input member include a plurality of radially outer lands (57a, 57b, and 57 c) having an axial length less than the nominal axial length L of the remaining lands (57), to further reduce the rate of increase of viscous shear torque transmitted to the outpu…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.