Motor grader or the like with hydraulic control system for circle gear
US4084644A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 17, 1976 |
| Grant date | Apr 18, 1978 |
| Priority date | — |
| Expiry date | Sep 17, 1996 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02F3/764
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A motor grader including a main frame mounted on steerable wheels, a drawbar frame mounted on the main frame, a working implement carried by a circle gear rotatably mounted on the drawbar frame and a hydraulic control circuit is described. An improvement in the control of the working implement is disclosed in which continuous downward force is exerted on the circle gear at all times during operation by hydraulic rams. Preferred embodiments of the invention are described wherein the force is exerted by hydraulic means including wear surfaces in contact with the circle gear and wherein the hydraulic control circuit is adapted to provide automatic operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.