发明授权
US5197864A On-off pressure cutoff control for a variable displacement hydraulic pump
失效
可变排量液压泵的开 - 关压力切断控制
- 专利标题: On-off pressure cutoff control for a variable displacement hydraulic pump
- 专利标题(中): 可变排量液压泵的开 - 关压力切断控制
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申请号: US821203申请日: 1992-01-16
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公开(公告)号: US5197864A公开(公告)日: 1993-03-30
- 发明人: Stephen V. Lunzman , John J. Krone , Lonnie J. Devier
- 申请人: Stephen V. Lunzman , John J. Krone , Lonnie J. Devier
- 申请人地址: IL Peoria
- 专利权人: Caterpillar Inc.
- 当前专利权人: Caterpillar Inc.
- 当前专利权人地址: IL Peoria
- 主分类号: E02F9/22
- IPC分类号: E02F9/22 ; F04B49/00 ; F04B49/08
摘要:
High pressure cutoff controls are useful for variable displacement hydraulic pumps for reducing power losses at high pressure levels. Some operators, however, believe that they get more work from pumps not having the high pressure cutoff control. The subject on-off high pressure cutoff control includes an on-off valve disposed in a pilot passage connected to an output port of a pump and to an end of a high pressure cutoff valve. The on-off valve is selectively movable between a first position at which pressurized fluid passes through the pilot passage to the end of the high pressure cutoff valve to prevent it from functioning as a high pressure cutoff valve. Thus, an operator has the option of operating the hydraulic pump with or without the high pressure cutoff control.
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