Concentric axial piston transmission
US6085521A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 10, 1998 |
| Grant date | Jul 11, 2000 |
| Priority date | — |
| Expiry date | Apr 10, 2018 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H39/14
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A continuously variable transmission includes a housing enclosing an axial piston pump and an axial piston motor arranged concentrically with respect to the pump. The pump and motor have cylinder blocks with axial cylinders, each receiving a piston. Pump and motor swash plates are engaged with the pump and motor pistons for rotating and nutating relative to the cylinder blocks to convert between fluid pressure power and rotating mechanical power. Input and output shafts are journaled in the housing for rotation about a central axis and have inner ends coupled to the pump and to the motor swash plate, respectively. Fluid passages between the pump cylinder block and the motor cylinder block convey fluid pressurized in the pump to the motor cylinders and convey spent fluid displaced from the motor cylinder block back to the pump cylinders. A mechanism changes the angle of the motor swash plate and the angle of the pump swash plate relative to the central axis under automatic or operator control to vary the transmission control for operation of the vehicle. The input shaft exerts a first component of torque through the pump to the pump swash plate and thence to the output swash plate a…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.