Swash plate type servo device for a plunger hydraulic unit
US6951164B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 15, 2004 |
| Grant date | Oct 4, 2005 |
| Priority date | — |
| Expiry date | Mar 16, 2024 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H39/14
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A hydraulic motor includes a motor cylinder having motor plunger holes, motor plungers disposed in the respective plunger holes, a motor rolling member which is tilted and rolled to change the angle of a swash plate, and a motor servo mechanism for tilting and rolling the motor rolling member. The motor servo mechanism includes a screw shaft with male screw, a ball nut having a ball thread mated to the male screw and connected to an arm portion of the motor rolling member, a swash plate control motor, and a stopper mounted to the end of the screw shaft. The stopper includes a ring portion adjacent to the end of the male screw at a limit position of the ball nut and a flange portion which contacts the side face of the ball nut at the limit position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.