发明授权
- 专利标题： Hydraulic circuit of construction machinery
- 专利标题（中）： 工程机械液压回路
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申请号： US10257631申请日： 2002-02-18
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公开(公告)号： US07076947B2公开(公告)日： 2006-07-18
- 发明人: Nobuei Ariga , Genroku Sugiyama , Hideaki Tanaka , Tsukasa Toyooka , Masaki Egashira , Takatoshi Ooki
- 申请人： Nobuei Ariga , Genroku Sugiyama , Hideaki Tanaka , Tsukasa Toyooka , Masaki Egashira , Takatoshi Ooki
- 申请人地址： JP Tokyo
- 专利权人： Hitachi Construction Machinery Co., Ltd.
- 当前专利权人： Hitachi Construction Machinery Co., Ltd.
- 当前专利权人地址： JP Tokyo
- 代理机构： Crowell & Moring LLP
- 优先权： JP2001-042082 20010219
- 国际申请： PCT/JP02/01378 WO 20020218
- 国际公布： WO02/066841 WO 20020829
- 主分类号： F16D31/02
- IPC分类号： F16D31/02
摘要：
To keep one of three hydraulic pumps unaffected by variations in torque of the remaining hydraulic pumps when the three hydraulic pumps are used, displacements of the first and second hydraulic pumps are controlled based on their own delivery pressures P1, P2 and a pressure P3′ obtained by reducing through a reducing valve 14 a delivery pressure P3 from the third hydraulic pump, while a displacement of the third hydraulic pump 3 is controlled only by its own delivery pressure P3. The pressure oil delivered from the third hydraulic pump 3, therefore, remains unaffected by variations in delivery flow rates from the first and second hydraulic pumps 1,2, in other words, by variations in their torque consumptions, so that the third hydraulic pump is assured to provide a stable flow rate.
公开/授权文献
- US20040020082A1 Hydraulic circuit of construction machinery 公开/授权日：2004-02-05
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