Fluid motor control system providing speed change by combination of displacement and flow control
US4354420A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 1, 1979 |
| Grant date | Oct 19, 1982 |
| Priority date | — |
| Expiry date | Nov 1, 1999 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B2211/3116
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A fluid motor control system (11) assures that automatic changes of motor displacement, which are initiated by occurrence of a predetermined operational condition in the system (11), result in a change of motor speed of the desired magnitude. Flow adjustment elements (76) respond to a displacement increase by reducing the flow of working fluid available to the motor or motors (12, 13) and respond to a motor displacement reduction by increasing the available flow. In one specific form, the system (11) controls a pair of right and left side vehicle drive motors (12, 13) and automatically increases motor displacements while reducing the fluid flow supplied to the motors (12, 13) to reduce travel speed during a turn of travel direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.