Valve unit with axial pressure medium unit

Abstract

A valve element for a hydraulic control device, in particular valve sleeve (1) or valve housing for a control valve on internal combustion engines or transmissions of motor vehicles, wherein the valve element has a displaceable control piston (2) which is subjected to load on one side by a spring (3) which is supported on a spring support (4) which is fixed to the valve element. The spring support (4) has at least one opening (7) which is connected to a pressure medium line, and the pressure medium line is in the form of a pressure medium inlet line. An axial filter (8) is arranged at the opening (7) of the spring support (4) and/or the opening (7) of the spring support (4) is provided with a check valve (9).

Claims

1. A valve element for a hydraulic control device, for a control valve on internal combustion engines or transmissions of motor vehicles, the valve element comprising a displaceable control piston, a spring which is directly supported against a spring contact surface defined by a spring support which is fixed to the valve element, the spring applying a force on one side of the control piston, the spring support has at least one opening which is connected to a pressure medium line and is defined radially inwardly from the spring contact surface, the pressure medium line is a pressure medium inlet line, and an axial filter is arranged directly in the at least one opening of the spring support, the axial filter is arranged perpendicular to a longitudinal axis of the spring, and the axial filter is integrally formed with the spring support.

2. The valve element as claimed in claim 1, wherein the spring support and the axial filter are formed as a structural unit.

3. The valve element as claimed in claim 1, wherein the spring support is a plastics injection-molded part which has integrated therein a filter fabric of the axial filter.

4. The valve element as claimed in claim 1, wherein the spring support has at least one projection on an outer circumference thereof, and in that the at least one projection is placeable in contact with a recess on an inner circumference of a valve sleeve.

5. The valve element as claimed in claim 1, wherein the spring support has a support plate which is connected to the spring and which is supported on the spring support.

6. The valve element as claimed in claim 1, wherein the spring support has a support plate which is connected to the spring and which is fixed to the spring support.

7. The valve element as claimed in claim 1, further comprising a check valve provided for the at least one opening, and the axial filter, the check valve, and the support plate are installed in sequence as viewed in a flow direction of the pressure medium.

8. The valve element as claimed in claim 1, wherein the valve element is a valve sleeve or a valve housing.

9. The valve element as claimed in claim 6, wherein the spring is integrally fixed to the spring support by insert molding.

10. The valve element as claimed in claim 1, wherein the axial filter engages an entire radially inner periphery of the at least one opening.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) For further explanation of the invention, reference is made to the drawings which illustrate exemplary embodiments of the invention in simplified form and in which:

(2) FIG. 1: shows partial sections through a valve sleeve and a control piston with different designs of the spring support in the left-hand and right-hand section halves,

(3) FIG. 2: shows partial sections corresponding to FIG. 1, with differently designed spring supports and integrally fastened axial filter, check valve, and support plate,

(4) FIG. 3: shows partial sections corresponding to FIG. 2, with the check valve open,

(5) FIG. 4: shows a plan view of a check valve, and

(6) FIG. 5: shows partial sections corresponding to FIG. 2, with a separately installed support plate.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

(7) In FIGS. 1 to 5, where illustrated in detail, 1 denotes a valve sleeve in which a control piston 2 is arranged in axially displaceable fashion. The control piston 2 interacts with a spring 3 which is supported on a spring support 4. The spring support 4 has a bead 5 which corresponds with a groove 6 on the internal wall of the valve sleeve 1 and thus ensures secure retention in the valve sleeve 1. The spring support 4 is produced from an elastic material, in particular plastic, and preferably produced by insert molding. In this way, the spring support 4 can be pushed into and locked in the central opening of the valve sleeve 1, such that simple installation is possible and good fixing of the spring support 4 in the valve sleeve 1 is obtained.

(8) In FIG. 1, an axial filter 8 is installed in the opening 7 of the spring support 4, which axial filter prevents the ingress of dirt particles into the control piston/valve sleeve region. Here, the filter fabric is integrated into the plastics spring support during the molding process.

(9) In FIG. 2, in addition to the axial filter 8, a check valve 9 with disk 10 and check plate 11 is also installed, said check valve likewise being integrated into the spring support 4 produced from plastic. Provided subsequently to the check valve 9 is a support plate 12 with a central opening, on which support plate the spring 3 is supported. The support plate 12 is likewise integrated into the spring support 4. A unit is thus created which is comprised of the spring support 4, the axial filter 8, the check valve 9, and the support plate 12.

(10) As can also be seen from FIG. 3, the support plate 12 serves as an abutment for a valve cover 13 of the check plate 11.

(11) It can be seen from FIG. 4 that the valve cover 13 of the check plate 11 is movably articulated by way of a sheet-metal strip, wherein the sheet-metal strip may be fastened to the disk 10 or may be independently integrated in the spring support 4.

(12) By contrast to the refinements of FIGS. 2 and 3, the support plate 12 as per FIG. 5 is in the form of a separate component and installed into the spring support 4. The support plate 12 is supported on the check valve 9, which is integrated into the spring support 4 and which thus offers secure retention.

LIST OF REFERENCE NUMERALS

(13) 1 Valve sleeve

(14) 2 Control piston

(15) 3 Spring

(16) 4 Spring support

(17) 5 Bead

(18) 6 Groove

(19) 7 Opening

(20) 8 Axial filter

(21) 9 Check valve

(22) 10 Disk

(23) 11 Check plate

(24) 12 Support plate

(25) 13 Valve cover