Device to reduce pulsations on a hydrostatic positive displacement unit

摘要

This invention relates to a device to reduce pulsations on a hydrostatic positive displacement unit, such as an axial piston machine or a radial piston machine which can be used both as a pump and as a motor. The direction of rotation of the positive displacement unit is reversible and at least one piston is mounted so that it can move longitudinally in a cylinder bore forming a cylinder chamber. The device has a buffer element which can be brought into communication with the cylinder chamber by a connecting channel. It is possible to further optimize the reversing action of the cylinder chambers from the inlet side to the outlet side and to effectively minimize pulsations in a broad bandwidth of operating conditions by increasing the capacity of the buffer element compared to the capacity of an oil-filled buffer element and/or by providing at least one additional connecting channel which connects the cylinder chamber with the buffer element or with a control nodule of the positive displacement unit, whereby a throttling device is located in the other connecting channel. The buffer element may be a hydropneumatic buffer.