Regulating device for a hydrostatic positive displacement unit
First Claim
1. A regulating device for a hydrostatic positive displacement unit, the device including a control valve which pressurizes regulating pistons which determine a stroke volume or a displacement volume of the positive displacement unit, wherein the control valve is a slide valve which can be actuated electrically, wherein the slide valve can be actuated by a stepper motor, further including a device which brings the slide valve into a zero position, wherein the device which brings the slide valve in the zero position is a coil spring which is orientated coaxially to the output shaft of the stepper motor and on the ends has two radially projecting ends, wherein between the ends of the coil spring there is a stop peg which is non-rotationally connected to the housing and a peg which is connected to the cam plate.
1 Assignment
0 Petitions
Accused Products
Abstract
A regulating device for a hydrostatic positive displacement unit, such as an axial piston machine employing the swash plate principle, includes a control valve which pressurizes a regulating piston which determines the stroke volume or the displacement volume of the positive displacement unit. An electric-hydraulic regulating device having a simple construction is provided with the control valve in the form of a slide valve which can be actuated electrically. In one configuration of the invention, the slide valve can be actuated by a stepper motor.
-
Citations
18 Claims
-
1. A regulating device for a hydrostatic positive displacement unit, the device including a control valve which pressurizes regulating pistons which determine a stroke volume or a displacement volume of the positive displacement unit, wherein the control valve is a slide valve which can be actuated electrically, wherein the slide valve can be actuated by a stepper motor, further including a device which brings the slide valve into a zero position, wherein the device which brings the slide valve in the zero position is a coil spring which is orientated coaxially to the output shaft of the stepper motor and on the ends has two radially projecting ends, wherein between the ends of the coil spring there is a stop peg which is non-rotationally connected to the housing and a peg which is connected to the cam plate.
-
2. A regulating device for a hydrostatic positive displacement unit, the device including a control valve which pressurizes regulating pistons which determine a stroke volume or a displacement volume of the positive displacement unit, wherein the control valve is a slide valve which can be actuated electrically, wherein the slide valve can be actuated by a stepper motor, and wherein the longitudinal axis of the slide valve is orientated at right angles to the axis of rotation of the axial piston machine and to a tilting axis of a tilting yoke and the longitudinal axis of the stepper motor is orientated parallel to the axis of rotation of the axial piston machined.
- 3. A regulating device for a hydrostatic positive displacement unit, the device including a control valve which pressurizes regulating pistons which determine a stroke volume or a displacement volume of the positive displacement unit, wherein the control valve is a slide valve which can be actuated electrically, wherein the slide valve can be actuated by a stepper motor, wherein the slide valve has a valve body which can move longitudinally in a sleeve, wherein the valve body is connected to an output shaft of the stepper motor to produce a linear movement of the valve body, wherein the valve body has at least one piston flange which actuates an annular groove located on the sleeve and connected to the regulating piston.
- 7. A regulating device for a hydrostatic positive displacement unit, the device including a control valve which pressurizes regulating pistons which determine a stroke volume or a displacement volume of the positive displacement unit, wherein the control valve is a slide valve which can be actuated electrically, wherein the slide valve can be actuated by a stepper motor, wherein an output shaft of the stepper motor is non-rotationally connected to a cam plate, and the cam plate is connected to a driver element which is provided for the actuation of the valve body.
- 17. A regulating device for a hydrostatic positive displacement unit, the device including a control valve which pressurizes regulating pistons which determine the stroke volume or displacement volume of the positive displacement unit, wherein the control valve is a slide valve which can be actuated electrically, wherein the slide valve can be actuated by a stepper motor, wherein the slide valve and the stepper motor are located on the housing of the positive displacement unit.
Specification