Hydromechanical transmission system
US4823647A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 21, 1988 |
| Grant date | Apr 25, 1989 |
| Priority date | — |
| Expiry date | Jan 21, 2008 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H61/0021
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An arrangement is disclosed for push-starting of road vehicles of the type having an internal combustion engine and an automatic hydrodynamic transmission provided with a friction clutch, shift gears and a solenoid valve system for controlling the transmission, and where the vehicle is provided with a compressed air system for conventional uses, such as braking. A hydropneumatic actuator is provided for pressurizing the transmission system by means of stored compressed air. A manual control switch enables the push-start control. Thereafter, when the vehicle is pushed at a sufficient speed, a speed sensor activates the hydropneumatic actuator, engages a selected set of transmission gears, and engages the friction clutch, allowing the engine to be driven through the wheels of the vehicle. A second speed sensor, disables the push-start system when engine speed rises to a level indicating successful starting.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.