Hydraulic control system for continuously variable transmission
US4718308A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 29, 1985 |
| Grant date | Jan 12, 1988 |
| Priority date | — |
| Expiry date | Mar 29, 2005 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H61/66259
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A control arrangement for a continuously variable transmission includes an electronic control system and a hydraulic control system. In the hydraulic control system three separate electromechanical control assemblies are used to regulate the pressure in the secondary sheave chamber (to hold the belt tension), the fluid flow to and from the primary sheave chamber (to regulate the CVT ratio), and to control the pressure in the apply line for the clutch chamber. The pump assembly of the hydraulic control system has a first output connection for providing fluid at line (high) pressure in the main line, and a second, low pressure output connection for providing fluid at a low pressure to satisfy the clutch cooling requirements. The high pressure and low pressure systems are essentially independent of each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.