摘要 |
A piston pump, in particular a radial piston pump which, as a secondary pump driven by the secondary side of a transmission, is to supply the transmission with oil if the primary pump driven by a motor fails, has a device for the purpose of lifting the delivery plunger (2) off its cam element (4) as a function of the presence of a control pressure generated by the primary pump. Said device consists in a piston chamber (14) being arranged on the side of the delivery plunger (2) opposite to the suction/discharge chamber (10), which piston chamber can be connected, via a non-return valve (16) which can be opened in the direction of the piston chamber (14), to a pressure connection (8) which can be connected both to the suction/discharge chamber (10) and to the oil circulation of the primary pump. <IMAGE>
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