Lubricating pump with double-acting drive piston

摘要

The invention relates to an automatic lubricating pump (1) for a machine having a hydraulically actuated striking tool (4), such as a hydraulic hammer for example. The lubricating pump (1) is designed such that it can be connected to a pressure line (P) of the hydraulic circuit (2). The lubricating pump (1) has a drive piston (8), designed such that it can be driven by the hydraulic circuit, and a feed piston, connected to the drive piston in a motion-transmitting manner, of a feed pump (9), by means of which lubricant is fed to a lubricating point. The service life of the lubricating pump can be prolonged compared with conventional pumps if the drive piston (8) is designed to be double-acting with two drive chambers (8c, 8d) and a hydraulically operable changeover member (16) is provided which can be engaged in the hydraulic circuit and by means of which the drive chambers (8c, 8d) can be alternately and automatically connected to the pressure line (8) during operation.

主权项

1. A device comprising:
an automatic lubricating pump designed for connection to a pressure line of a hydraulic circuit, the pressure line having a repeatedly rising and dropping hydraulic pressure or a constant hydraulic pressure to drive a machine, wherein the automatic lubricating pump comprises
a drive piston shaped to be driven by the hydraulic circuit, anda feed piston connected to the drive piston in a motion-transmitting manner, said feed piston bordering on a lubricant feed chamber connected to at least one lubricant outlet of the automatic lubricating pump, wherein the drive piston is designed to be double-acting with two drive chambers, and the automatic lubricating pump comprises a changeover member configured to be engaged by the hydraulic circuit and operated by the hydraulic pressure of the pressure line to alternately connect the drive chambers to the pressure line.