发明授权
- 专利标题: Energy recovering method and system in hydraulic lift device of battery operated industrial trucks
- 专利标题(中): 电动工业卡车液压升降装置能量回收方法及系统
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申请号: US11663534申请日: 2006-02-13
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公开(公告)号: US07770697B2公开(公告)日: 2010-08-10
- 发明人: Kensuke Futahashi , Hiroshi Satou , Masataka Kawaguchi , Tomohiro Akaki , Fujio Eguchi , Keizo Ogino , Shingo Yuguchi , Kazuhito Kawashima , Michio Akao
- 申请人: Kensuke Futahashi , Hiroshi Satou , Masataka Kawaguchi , Tomohiro Akaki , Fujio Eguchi , Keizo Ogino , Shingo Yuguchi , Kazuhito Kawashima , Michio Akao
- 申请人地址: JP Tokyo
- 专利权人: Mitsubishi Heavy Industries, Ltd.
- 当前专利权人: Mitsubishi Heavy Industries, Ltd.
- 当前专利权人地址: JP Tokyo
- 代理机构: Birch, Stewart, Kolasch & Birch, LLP
- 优先权: JP2005-052162 20050225
- 国际申请: PCT/JP2006/302899 WO 20060213
- 国际公布: WO2006/090655 WO 20060831
- 主分类号: B66F9/22
- IPC分类号: B66F9/22 ; F15B21/14 ; F16D31/02
摘要:
An energy recovering system in a hydraulic lift device of a battery operated industrial truck. With the system, working oil can be supplied to other hydraulic actuators while energy recovering operation is performed by the hydraulic lift device, occurrence of pressure pulsation in the working oil can be prevented, and energy recovering efficiency is increased. The hydraulic lift device comprises a lift cylinder (1) for lifting a fork F, an electric motor (4) rotated by power supply from a battery (5), a hydraulic pump (3) for supplying pressurized oil to the lift cylinder (1), a control valve (14) disposed in a pressurized oil supply path (23), and a controller (17). The controller (17) controls the opening of the control valve (14) and rotation speed of the electric motor (4) which functions as an electric generator driven by the hydraulic pump (3) rotated by the action of the pressurized oil returning from the lift cylinder (1) when a load is lowered so that the generated electricity charges the battery (5) to recover the potential energy of the load.