Hydraulic control system for an infinitely variable belt-drive transmission
US4644827A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 22, 1984 |
| Grant date | Feb 24, 1987 |
| Priority date | — |
| Expiry date | Mar 22, 2004 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H61/66259
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A system for controlling the transmission ratio of an infinitely variable belt drive transmission having a primary pulley, a secondary pulley, a belt engaged with both pulleys, a pressure oil circuit having a pump for supplying pressure oil, and a transmission ratio control valve responsive engine speed for controlling the pressure oil and for changing the transmission ratio. The system has an electronic control circuit responsive to ignition pulses of the engine for producing output pulses dependent on the engine speed, and an electromagnetic valve responsive to the output pulses for controlling the amount of pressure oil applied to the transmission ratio control valve, thereby controlling the transmission ratio in dependency on the engine speed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.