A hydraulic pumping device for use in a hydraulic machine having a piston and slider shoe unit made of a combination of plastic and metal material to operate with virtually lubricant free fluid.
申请公布号
US5469776(A)
申请公布日期
1995.11.28
申请号
US19940274246
申请日期
1994.07.13
申请人
DANFOSS A/S
发明人
MARTENSEN, LARS;HANSEN, OVE T.;MOELLER, HENRY M.;JEPSEN, HARDY
