Adjusting device of a hydrostatic module

摘要

An adjusting device of an axial piston machine having a displacement volume that is adjusted by a pivoting yoke. The adjusting device has a cylinder, which is radially spaced from and tangential to the yoke pivot axis. A piston communicates with the yoke and is adjusted by hydraulic pressure change. A control arrangement has a position regulating valve with a control piston which can set the hydraulic pressure acting on the piston. A mechanical return can transfer the yoke pivoting position to the control piston. The valve is axially parallel to the cylinder and radially spaced from the yoke pivot axis. The return comprises an axially movable sensing piston and coaxial return spring which are axially adjacent to the valve. The sensing piston abuts a yoke surface that is eccentric with respect to the pivot axis and connected to the control piston by the return spring.

主权项

1. An adjusting device of a hydrostatic module comprising:
at least one axial piston machine which communicates with a yoke such that a displacement volume of the at least one axial piston machine is adjustable by pivoting of the yoke (5), the adjusting device having a hydraulic adjusting cylinder, which is disposed radially spaced from and tangential with respect to a pivot axis of the yoke (5), the adjusting cylinder has an adjusting piston, which is operatively connected to the yoke (5) by way of a pivot lever and the adjusting piston is biased within the adjusting cylinder by an adjusting pressure difference of a hydraulic pressure medium which acts on two opposing piston surfaces of the adjusting piston, the adjusting device has a control arrangement (1, 1′, 1*), which has a position regulating valve (2) in a form of an electromagnetically controllable hydraulic proportional valve, the position regulating valve has an axially slidable control piston (3), adjustment of an axial position of the control piston adjusts the adjusting pressure difference which acts on the two opposing piston surfaces of the adjusting piston of the adjusting cylinder, the adjusting device has a non-positively locking mechanical return device (4), which communicates with the yoke such that a pivoting position of the yoke (5) is transferable to the control piston (3) of the position regulating valve (2), and the position regulating valve (2) being disposed axially parallel to the adjusting cylinder and disposed radially spaced from the pivot axis of the yoke (5), and the return device (4) comprising an axially movable, guided sensing piston (6, 6′, 6*) and a return spring (7) in the form of a helical spring, the sensing piston and the return spring are coaxially aligned and axially adjacent to the position regulating valve (2), and the sensing piston (6, 6′, 6*) abuts a feedback surface (8) of the yoke (5), the feedback surface of the yoke is eccentric with respect to the pivot axis of the yoke and the sensing piston is operatively connected to the control piston (3) of the position regulating valve (2) by the return spring (7).