Control system and continuously variable transmission provided therewith
US6679805B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 2001 |
| Grant date | Jan 20, 2004 |
| Priority date | — |
| Expiry date | Feb 6, 2022 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H61/66259
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A control system for a continuously variable transmission provided with a first pulley (1) having two pulley discs (5, 7), with a second pulley (2) having two pulley discs (6, 8) and with a drive belt (10) wound around said pulleys (1, 2) for transmitting torque there between, at least one disc (7) of the first pulley (1) being axially movable with respect to the other disc (5) of the pulley (1) under the influence of an axial force provided on the movable disc (7) by a line pressure (PLP) in a cylinder (11) of a piston/cylinder assembly (11, 13) associated with the the first pulley (1) and at least one disc (6) of the second pulley (2) being axially movable with respect to the other disc (8) of the pulley (2) under the influence of an axial force provided on the movable disc (8) by a second cylinder pressure (P2CP) in a cylinder (12) of a piston/cylinder assembly (12, 14) associated with the the second pulley (2). The control system is arranged to control the second cylinder pressure (P2CP) between two pressure levels (PLP; PR) by a second valve (32) that may be influenced not only by a control pressure (PC), but also by the second cylinder pressure (P2CP).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.