Arrangement of an electromagnet for controlling a central valve

Abstract

An arrangement of an electromagnet (6) for controlling a central valve (2) is provided. A thrust pin (4) is coupled to the electromagnet (6) and can be moved along a first axis (A) in such a way that a control piston (1) of the central valve (2) can be displaced along a second axis (B) in a central valve housing (8) by the movable thrust pin (4). The first axis (A) of the thrust pin (4) extends parallel to and at a radial spacing (10) relative to the second axis (B) of the control piston (1).

Claims

1. An arrangement of an electromagnet for controlling a central valve, the arrangement comprising: the electromagnet; and a thrust pin coupled to the electromagnet and axially movable along a first axis defined by a center of the thrust pin in such a way that a control piston of the central valve is axially displaceable along a second axis defined by a center of the control piston in a central valve housing by the movable thrust pin contacting the control piston, the first axis of the thrust pin extending in parallel to and at a radial distance with respect to the second axis of the control piston; wherein the thrust pin is configured such that relative movement between the thrust pin and the control piston generates a relative movement of the first axis in relation to the second axis that causes a contact surface of the control piston to move along a front face of the thrust pin; and wherein the thrust pin is arranged and configured such that, during operation, the first axis of the thrust pin undergoes relative movement with respect to the second axis in a circular path at an intersection of the first axis and the contact surface of the control piston.

2. The arrangement as recited in claim 1 wherein the electromagnet coupled to the thrust pin is installed eccentrically relative to the central valve so that the first axis of the thrust pin extends in parallel to and at a distance with respect to the second axis of the control piston.

3. The arrangement as recited in claim 1 wherein the thrust pin is arranged and configured such that the relative movement generates a hydrodynamic lubricating film between the contact surface of the control piston and the front face of the thrust pin from adjacent fluid.

4. The arrangement as recited in claim 1 wherein a front face of the thrust pin is smaller than the contact surface of the control piston.

5. A combination of a central valve and arrangement of an electromagnet for controlling the central valve, the combination comprising: a central valve having a control piston and a central valve housing; an electromagnet; and a thrust pin coupled to the electromagnet and movable along a first axis defined by a center of the thrust pin in such a way that the control piston of the central valve is displaceable along a second axis defined by a center of the control piston in the central valve housing by the movable thrust pin contacting the control piston, the first axis of the thrust pin extending in parallel to and at a radial distance with respect to the second axis of the control piston; wherein the thrust pin and control piston are arranged and configured with respect to each other such that relative movement between the thrust pin and the control piston generates a relative movement of the first axis in relation to the second axis that causes a contact surface of the control piston to move along a front face of the thrust pin; and wherein the thrust pin and control piston are arranged and configured with respect to each other such that, during operation, the first axis of the thrust pin undergoes relative movement with respect to the second axis in a circular path at an intersection of the first axis and the contact surface of the control piston.

6. The combination as recited in claim 5 wherein the electromagnet coupled to the thrust pin is installed eccentrically relative to the central valve so that the first axis of the thrust pin extends in parallel to and at a distance with respect to the second axis of the control piston.

7. The combination as recited in claim 5 wherein the thrust pin and control piston are arranged and configured with respect to each other such that the relative movement generates a hydrodynamic lubricating film between the contact surface of the control piston and the front face of the thrust pin from adjacent fluid.

8. The combination as recited in claim 5 wherein a front face of the thrust pin is smaller than the contact surface of the control piston.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 shows a longitudinal section of the arrangement according to the present invention of an electromagnet for controlling a central valve, in the installed state;

(2) FIG. 2 shows a top view of the arrangement according to the present invention in a contact situation of the thrust pin and the control piston; and

(3) FIG. 3 shows a schematic view of the area in which the thrust pin and the control piston cooperate during operation and produce a hydrodynamic lubricating film.

DETAILED DESCRIPTION

(4) Identical reference numerals are used for elements of the present invention which are identical or which act in an identical manner. Furthermore, for the sake of clarity, the individual figures show only reference numerals which are necessary to describe the figure in question. The illustrated specific embodiments are merely examples of how the arrangement according to the present invention of an electromagnet for controlling a central valve may be configured, and thus do not represent any final limitation of the present invention.

(5) FIG. 1 shows a longitudinal section of the arrangement according to the present invention of an electromagnet 6 for controlling a central valve 2, in the installed state. Here, a thrust pin 4 is coupled to electromagnet 6 so that thrust pin 4 is movable along a first axis A. Thrust pin 4 acts, in its axial movement, on a control piston 1 of central valve 2. Control piston 1 is displaceable along a second axis B in a central valve housing 8 with the aid of movable thrust pin 4.

(6) According to the present invention, first axis A of thrust pin 4 extends in parallel to and at a radial distance 10 from second axis B of control piston 1.

(7) This spaced arrangement of first axis A relative to second axis B thus makes it possible, during operation, for a relative speed to form between a contact surface 12 of control piston 1 and a front face 13 of thrust pin 4. Then, in a contact situation of thrust pin 4 and control piston 1, as shown in FIG. 2, first axis A of thrust pin 4 describes a circular path 14 on contact surface 12 of control piston 1.

(8) In order to achieve this arrangement, in particular the relative movement between thrust pin 4 and control piston 1, electromagnet 6 of thrust pin 4 is installed eccentrically relative to central valve 2 so that first axis A of thrust pin 4 extends in parallel to second axis B of control piston 1 and at a distance from second axis B. Due to this targeted eccentric installation of electromagnet 6 of thrust pin 4 relative to central valve 42 beyond the otherwise customary permitted positional deviations of the components relative to one another, the sliding speed between control piston 1 and thrust pin 4 is significantly increased. As schematically shown in FIG. 3, this results in the formation of a hydrodynamic lubricating film 15 between control piston 1 and thrust pin 4. As a result, the wear on the sliding partners composed of contact surface 12 of control piston 1 and front face 13 of thrust pin 4 is reduced or prevented. In particular, as also shown in FIG. 3, front face 13 of thrust pin 4 is smaller than contact surface 12 of control piston 1.

LIST OF REFERENCE NUMERALS

(9) 1 control piston 2 central valve 4 thrust pin 6 electromagnet 8 central valve housing 10 distance 12 contact surface of control piston 13 front face of thrust pin 14 circular path 15 hydrodynamic lubricating film A first axis B second axis