Slip controller for a continuously variable transmission
US5871411A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 22, 1995 |
| Grant date | Feb 16, 1999 |
| Priority date | — |
| Expiry date | Nov 22, 2015 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2342/044
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
For an electro-hydraulically actuable continuously variable belt transmission, the selected contact pressure at the movable conical pulley discs must be of such a magnitude that the chain, the force transmitting belt or the like does not slip. On the other hand, the contact pressure should not be too great for a high efficiency of the transmission to be achieved at every operating point. The invention reliably prevents slippage of the belt (chain, force transmitting belt or the like) by controlling the belt slip. The mean contact pressure is thereby reduced. As a result, there is a decrease in the mechanical and hydraulic losses at the transmission. A variant of the invention includes an embodiment of a rotational-speed sensor which makes it simultaneously possible to measure the axial position of the pulley disc(s). As a result, there is a reduction in the additional complexity required for slip control compared to the belt-tension control.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.