| 发明名称 | Meterless hydraulic system having restricted primary makeup | ||
| 摘要 | A hydraulic system is disclosed. The hydraulic system may have a primary pump, a hydraulic actuator, and first and second passages fluidly connecting the primary pump to the hydraulic actuator in a closed-loop manner. The hydraulic system may also have a charge circuit, a makeup valve movable to selectively allow charge fluid from the charge circuit to enter the first or second passages, and at least one restricted pilot passage configured to direct pilot fluid to the makeup valve to move the makeup valve and allow the charge fluid into the first and second passages. | ||
| 申请公布号 | US8966892(B2) | 申请公布日期 | 2015.03.03 |
| 申请号 | US201113222945 | 申请日期 | 2011.08.31 |
| 申请人 | Caterpillar Inc. | 发明人 | Opdenbosch Patrick;Knussman Michael L.;Dierking Joshua |
| 分类号 | F15B11/08 | 主分类号 | F15B11/08 |
| 代理机构 | Finnegan, Henderson, Farabow, Garrett & Dunner, LLP | 代理人 | Finnegan, Henderson, Farabow, Garrett & Dunner, LLP |
| 主权项 | 1. A hydraulic system, comprising: a primary pump; a hydraulic actuator; first and second passages fluidly connecting the primary pump to the hydraulic actuator in a closed-loop manner; a charge circuit, the charge circuit including a displacement control valve configured to affect displacement control of the primary pump, wherein the charge circuit includes a charge pump and an accumulator configured to pressurize charge fluid in the charge circuit; a makeup valve movable to selectively allow charge fluid from the charge circuit to enter the first or second passages; and at least one restricted pilot passage configured to direct pilot fluid to the makeup valve to move the makeup valve and allow the charge fluid into the first and second passages. | ||
| 地址 | Peoria IL US | ||