Proportional spool valve for adjusting the displaced volume of a displacement pump, assembly method and system

Patent metadata

Field	Value
Publication number	US-11346337-B2
Application number	US-201816607926-A
Country	US
Kind code	B2
Filing date	Apr 19, 2018
Priority date	Apr 27, 2017
Publication date	May 31, 2022
Grant date	May 31, 2022

Abstract

A proportional spool valve (1) for adjusting a displaced volume of a displacement pump, in particular of an oil pump in a motor vehicle, the proportional spool valve (1) includes a valve housing (2) and a valve spool (3) which is mounted in the valve housing (2) and displaceable along a displacement axis (V) and which can be displaced against the spring force of a valve spring (6) axially supported on a spring holder (7) which is fixed relative to the valve housing (2) by energizing an electrical coil assembly (10), characterized in that wherein both the preferably single-piece spring holder (7) and the valve housing (2) are made of plastic and that the spring holder (7) is welded to the valve housing (2), an integral welded connection (9) being formed.

First claim

The invention claimed is:

1. A proportional spool valve ( 1 ) for adjusting a displaced volume of a displacement pump, the proportional spool valve ( 1 ) comprising a valve housing ( 2 ) and a valve spool ( 3 ) which is mounted in the valve housing ( 2 ) and displaceable along a displacement axis (V) and which can be displaced against the spring force of a valve spring ( 6 ) axially supported on a spring holder ( 7 ) which is fixed relative to the valve housing ( 2 ) by energizing an electrical coil assembly ( 10 ), wherein
both the spring holder ( 7 ) and the valve housing ( 2 ) are made of plastic and the spring holder ( 7 ) is welded to the valve housing ( 2 ), an integral welded connection ( 9 ) being formed wherein the spring holder ( 7 ) has at least one spool section ( 17 , 18 ) which extends outwards in the radial direction and which, in a circumferential direction, is welded to at least one associated valve housing section ( 19 , 20 , 21 , 22 ) opposite said spool section ( 17 , 18 ) in the circumferential direction, wherein said at least one valve housing section ( 19 , 20 , 21 , 22 ) is projecting outwards in the radial direction in the form of a ridge.

2. The proportional spool valve according to claim 1 , wherein the spring holder ( 7 ) and the valve housing ( 2 ) overlap in the radial direction.

3. The proportional spool valve according to claim 1 , wherein the spool section ( 17 , 18 ) is sandwiched between two valve housing sections ( 19 , 20 , 21 , 22 ) which are spaced in the circumferential direction, and are welded to both of the two valve housing sections ( 19 , 20 , 21 , 22 ) by full penetration welding in the circumferential direction, or wherein the spool section ( 17 , 18 ) is welded to the valve housing section ( 19 , 20 , 21 , 22 ) to a ridge projecting outwards in the radial direction, exclusively in the circumferential direction.

4. The proportional spool valve according to claim 1 , wherein the at least one spool section ( 17 , 18 ) and the valve housing section ( 19 , 20 , 21 , 22 ) are welded to one another over an entire surface or at spaced weld spots which are defined by a surface structure of the at least one spool section ( 17 , 18 ) and/or of the valve housing ( 2 ).

5. The proportional spool valve according to claim 1 , wherein the spring holder ( 7 ) has at least two, spool sections ( 17 , 18 ) which are each welded to at least one valve housing section ( 19 , 20 , 21 , 22 ).

6. The proportional spool valve according to claim 1 , wherein the spring holder ( 7 ) and the valve housing ( 2 ) are exclusively welded to one another at radially opposed circumferential contact surfaces.

7. The proportional spool valve according to claim 1 , further comprising an axial stop on one of the valve housing ( 2 ) or the spring holder ( 7 ) in order to limit axial sliding insertion movement of the spring holder ( 7 ) into the valve housing ( 2 ) during assembly.

8. The proportional spool valve according to claim 1 , wherein the spring holder ( 7 ) limits an axial through-flow channel ( 8 ) which communicates with a pressure connection (P) of the proportional spool valve ( 1 ) and/or wherein the valve spool ( 3 ) has surfaces ( 4 , 5 ) for a displacement pressure of a displaced fluid, which are opposed to one another and which differ in size to create a differential force which counteracts on the valve spool ( 3 ) of the valve spring ( 6 ) according to a size difference of the surfaces ( 4 , 5 ).

9. A method for assembling the proportional spool valve ( 1 ) according to claim 1 , comprising the steps:
providing the spring holder ( 7 ) and the valve housing ( 2 ) and the valve spring ( 6 )
inserting the valve spring ( 6 ) and the spring holder ( 7 ) into the valve housing ( 2 )
fixing the spring holder ( 7 ) to the valve housing ( 2 ),
wherein
the spring holder ( 7 ) made of plastic and the valve housing ( 2 ) made of plastic are fixed to one another by welding, an integral welded connection ( 9 ) being formed.

10. The method according to claim 9 , wherein spring bias of the valve spring ( 6 ) is adjusted by axially moving the spring holder ( 7 ) and the valve housing ( 2 ) relative to each other before welding.

11. The method according to claim 9 , wherein the spring holder ( 7 ) has at least one spool section ( 17 , 18 ) which extends outwards in the radial direction and which, in the circumferential direction, is welded to the valve housing section ( 19 , 20 , 21 , 22 ).

12. The method according to claim 11 , wherein the spool section ( 17 , 18 ) is sandwiched between two valve housing sections ( 19 , 20 , 21 , 22 ) spaced in the circumferential direction, and said spool section is welded to both of the two valve housing sections ( 19 , 20 , 21 , 22 ), by full penetration welding of at least one of the two valve housing sections ( 19 , 20 , 21 , 22 ) in the circumferential direction.

13. The method according to claim 11 , wherein the spool section ( 17 , 18 ) is welded, exclusively in the circumferential direction, to the valve housing section ( 19 , 20 , 21 , 22 ), under simultaneous application of contact pressure to the spool section ( 17 , 18 ) in the circumferential direction by means of an anvil, against the valve housing section ( 19 , 20 , 21 , 22 ) from a side of the spool section ( 17 , 18 ) facing away from the valve housing section ( 19 , 20 , 21 , 22 ).

14. The method according to claim 9 , wherein the spring holder ( 7 ) and the valve housing section ( 19 , 20 , 21 , 22 ) are welded to one another exclusively at circumferential contact surfaces opposing each other in the radial direction.

15. An oil pumping system in a motor vehicle, comprising a displacement pump which has an adjustable displaced volume impeller pump and a proportional spool valve ( 1 ) according to claim 1 , the system being configured and disposed to adjust the displaced volume of the displacement pump.

16. The proportional spool valve according to claim 3 , wherein the two valve housing sections are ridges projecting outwards in the radial direction.

17. The method according to claim 9 , wherein the valve housing section is a ridge projecting outwards in the radial direction.

18. The method according to claim 12 , wherein the two valve housing sections are two ridges projecting outwards in the radial direction.

19. The proportional spool valve according to claim 1 , wherein the displacement pump is an oil pump of a motor vehicle.

Assignees

• Eto Magnetic Gmbh

Inventors

• Feindler Michael
• Nieweglowski Marcin

Classifications

• F04B53/108 Primary

  Valves characterised by the material · CPC title

• F04B7/0076

  the members being actuated by electro-magnetic means · CPC title

• F01M2001/0246

  Adjustable pumps · CPC title

• F16K27/10

  Welded housings · CPC title

• F04B49/225

  with throttling valves or valves varying the pump inlet opening or the outlet opening · CPC title