Controller of toroidal continuously variable transmission
US6409625B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 9, 2000 |
| Grant date | Jun 25, 2002 |
| Priority date | — |
| Expiry date | Nov 9, 2020 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2037/088
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A toroidal continuously variable transmission (1) comprises power rollers (18C, 18D, 20C, 20D) which transmit a torque between input disks (18A, 20A) and output disks (20A, 20B), and trunnions (104, 105, 114, 115) which drive the power rollers (18C, 18D, 20C, 20D) in a perpendicular direction to a rotation shaft (16A) according to a differential pressure between a first oil chamber (101) and a second oil chamber (102). When the second oil chamber (102) is at higher pressure than the first oil chamber (101), the toroidal continuously variable transmission (1) causes a downshift, and when the first oil chamber (101) is at higher pressure than the second oil chamber (102), the toroidal continuously variable transmission (1) causes an upshift. The first oil chamber (101) is connected to a first passage (176) and the second oil chamber (102) is connected to a second passage (177). A speed ratio control valve (70, 70A) controls a direction and a flowrate of the first passage (176) and the second passage (177). A pressure control valve (200, 210, 220, 40, 45, 41, 46) limits a maximum differential pressure of the first oil chamber (101) and the second oil chamber (102) when the transmissio…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.