发明授权
- 专利标题: Hydraulically controllable transmission
- 专利标题(中): 液压可控变速器
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申请号: US556338申请日: 1990-07-20
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公开(公告)号: US5117953A公开(公告)日: 1992-06-02
- 发明人: Satoshi Machida , Muneji Okamoto , Akio Hattori , Masayuki Nakamura
- 申请人: Satoshi Machida , Muneji Okamoto , Akio Hattori , Masayuki Nakamura
- 申请人地址: JPX Osaka
- 专利权人: Kubota Corporation
- 当前专利权人: Kubota Corporation
- 当前专利权人地址: JPX Osaka
- 优先权: JPX1-189116 19890721; JPX1-325281 19891214; JPX1-326511 19891215
- 主分类号: B60W30/18
- IPC分类号: B60W30/18 ; F16D48/06
摘要:
A hydraulically operable transmission comprises a hydraulic clutch, a change speed control valve, change speed actuators controllable by the control valve, a pilot oil line for varying pressure states in response to operation of the actuators, an oil supply line extending to the hydraulic clutch, a clutch control valve operable with a pilot pressure applied from the pilot oil line to close the oil supply line, and a pressure buildup device mounted on the oil supply line. The pressure buildup device includes an oil chamber for producing predetermined pressure increase characteristics with a pilot pressure applied from the oil supply line and a spring load, a drain line extending from the oil chamber, and a drain control valve mounted on the drain line for opening and closing the drain line in response to the pilot pressure applied from the pilot oil line.