DE102007019265A1 - check valve - Google Patents

Abstract

In a check valve having a circular-cylindrical housing (1) which has at one axial end a housing bottom (7) with a passage opening (8) and a valve seat (9), with a cage (2) surrounded by the housing (1) and secured therein ) having a cage bottom (5) with a passage opening (12) on which a compression spring (4) is supported with one end, and with one in the cage (2) from the compression spring (4) to the valve seat (9) Pressable closure piece (3), according to the invention, the cage (2) a plurality of circumferentially spaced successively, with the cage bottom (5) connected to cage struts (6), only with their from the cage bottom (5) facing away from end regions in the housing (1) held, but otherwise with the cage bottom (5) outside the housing (1) are arranged.

Description

Field of the invention

The The invention relates to a check valve with a circular cylindrical Housing, which at one axial end a housing bottom with a passage opening and with one in the region of this opening located valve seat, with one of the housing surrounded and in it fixed cage, which at its of the housing bottom facing away from the axial end with a Having passage opening provided cage floor, on which a pressure spring used in the cage with one end is supported, and one in the cage arranged axially movable and from the compression spring to the valve seat Pressable closure piece.

Background of the invention

One such check valve, for example, in the oil circuit an internal combustion engine are installed, where it forms part of a hydraulically actuated device, e.g. B. a camshaft adjustment, can be. In this way, in certain operating conditions prevents the engine oil from flowing back be, which acts as a hydraulic medium here.

From the patent DE 101 39 499 C1 a check valve of the type mentioned is known. There, the cage is designed as a plastic cage and completely pressed into the designated as a valve body housing. The hydraulic fluid, which passes through the passage opening of the housing bottom into the interior of the valve during operation, can escape there only through the passage opening of the cage bottom out of the valve. This results in a disadvantageous manner in the hydraulic fluid pressure loss, which is essentially due to the narrow cross sections of the passage openings.

Summary of the invention

Of the Invention is based on the object, a check valve to develop, in which the pressure loss in the flowing through Hydraulic fluid is reduced.

These The object is achieved according to the invention that the cage several in the circumferential direction at intervals arranged one behind the other, connected to the cage floor Has cage struts, only these with their from the Cage bottom facing away end portions in the housing held, but otherwise with the cage floor are arranged outside the housing.

By the outer part in relation to the housing the cage can be the hydraulic fluid flowing through both in the axial direction of the cage, also referred to as an insert, as well as laterally to the cage in any direction emerge from the check valve and discharged become. As a result of this exposed arrangement of the cage the pressure loss in the hydraulic fluid is particularly low. It Therefore, for example, lateral outlet holes of the housing not required to get a low pressure loss. In this way, there is a great advantage in terms of Production costs.

The Check valve according to the invention is universal can be used and with respect to the outflow of the hydraulic fluid not limited to one direction only. By the possibility a lateral and axial outflow, the valve both in applications where the outflow direction z. B. is offset by 90 °, as well as in any other angular position, as well as used in applications, in which the outflow in the same direction as the outflow takes place.

The The construction according to the invention allows the Check valve as required both as a plate valve (with a plate as a closure piece) as well as a ball valve (with a ball as a closure piece) perform. The housing may be a metallic component. Corresponding the respective application can be a heat treatment of the metallic housing.

The Guiding the locking piece (ball or plate) takes place in the cage. This is preferably made of a plastic produced. He can z. B. with three cage struts as a tripod or with four cage struts as Vierbein fluidly be designed low, so that when flowing through the hydraulic fluid an extremely low pressure drop arises.

The Construction of the check valve according to the invention is designed so that its items with technologies can be produced, which are especially for large Quantities are suitable, so in terms of manufacturing costs An attractive check valve is created.

Short description of the drawing

embodiments The invention are illustrated in the drawing and will be described in more detail below described. Show it:

1 a check valve with a designed as a ball closure piece in longitudinal section;

2 an end view of the check valve according to arrow II of 1 ;

3 a perspective view of the check valve according to 1 ;

4 another check valve with a designed as a plate closure piece in longitudinal section.

Detailed description the drawing

That in the 1 to 3 illustrated check valve consists of four component elements, namely a circular cylindrical housing 1 a cage 2 , a closure piece 3 and a compression spring 4 , The housing 1 is metallic, z. B. made of steel or aluminum, while the cage 2 a plastic part is. It consists of a circular cage floor 5 and four axis-parallel cage struts 6 that with the cage floor 5 are made in one piece and each at an axial end in the cage floor 5 pass.

With each other axial end protrudes each cage strut 6 in the interior of the case 1 into it. She is there on the case 1 attached.

The housing 1 has at one axial end of its circular cylindrical portion a integrally formed with this circular surface housing bottom 7 on, with a central opening 8th is provided. This will be inside the case 1 from a valve seat 9 Surrounded by the case back 7 located. The valve seat 9 is the in the formation of the passage opening 8th resulting inner circular edge of the housing bottom 7 , The compression spring 4 and the closure piece 3 be in the cage 2 inserted. Thereafter, this assembly is in the housing 7 used. Subsequently, the housing 1 crimped, so that the component elements of the check valve are held together.

The compression spring 4 and the closure piece 3 are in the cage 2 arranged axially movable. The compression spring 4 is designed as a helical spring, with one end on the inside of the cage floor 5 and with the other end on the closure piece 3 supported. This is where in the 1 to 3 shown embodiment, a ball. The compression spring 4 causes the axial abutment of the closure piece 3 at the valve seat 9 of the case bottom 7 ,

During operation, hydraulic fluid flows in the axial inflow direction 10 through the passage opening 8th in the check valve. In this case, due to the pressure of the hydraulic fluid, the force of the compression spring 4 overcome, leaving the closure piece 3 from the valve seat 9 must take off. After flowing through the check valve, the hydraulic fluid passes in the axial outflow direction 11 through a central passage opening 12 of the cage floor 5 as well as in lateral outflow directions 13 through the between the cage struts 6 located gaps from the check valve back out.

This check valve differs from that in 4 shown valve only in that there as a closure piece 14 A plate is used on the inside of the case bottom 7 on an annular surface-shaped valve seat formed there 15 can be applied. In this embodiment, the plate is formed integrally with a circular cylinder, at one axial end of which it is adjacent. The design and dimensions of the circular cylinder must be chosen so that the hydraulic fluid after flowing through the passage opening 8th in the check valve this in the lateral outflow directions 13 and possibly also in the axial outflow direction 12 can leave again.

to Production of the check valves according to the invention No machining processes are required. The Valves are for cost-effective production suitable for large quantities. Such a check valve For example, at its place of use in a receiving bore of a Machine part to be pressed. Subsequently, optionally caulking be performed, which the valve in the bore of the machine part an additional grip provides. In this way can on a screw-in solution be omitted, so that the production of a screw thread and / or the use of a sealing ring in the check valve is not required.

1

casing

2

Cage

3

closing piece

4

compression spring

5

cage floor

6

cage strut

7

caseback

8th

Through opening

9

valve seat

10

inflow

11

axial outflow

12

Through opening

13

lateral outflow

14

closing piece

15

valve seat

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 10139499 C1 [0003]

Claims (10)

Check valve with a circular cylindrical housing ( 1 ), which at one axial end a housing bottom ( 7 ) with a passage opening ( 8th ) and with a valve seat located in the region of this opening ( 9 . 15 ), with one of the housing ( 1 ) surrounded and fixed therein cage ( 2 ), which at its from the housing floor ( 7 ) facing away from an axial end with a passage opening ( 12 ) provided cage floor ( 5 ), on which one in the cage ( 2 ) used compression spring ( 4 ) is supported with one end, and with one in the cage ( 2 ) arranged axially movable and by the compression spring ( 4 ) to the valve seat ( 9 . 15 ) press-on closure piece ( 3 . 14 ), characterized in that the cage ( 2 ) a plurality of circumferentially spaced at intervals, with the cage floor ( 5 ) connected cage struts ( 6 ), only these with their from the cage floor ( 5 ) end portions remote in the housing ( 1 ), but otherwise with the cage floor ( 5 ) outside the housing ( 1 ) are arranged. Check valve according to claim 1, characterized in that the closure piece ( 3 ) is a ball. Check valve according to claim 1, characterized in that the closure piece ( 14 ) is a plate. Check valve according to claim 3, characterized that the plate is made in one piece with a circular cylinder is, at one axial end, it is arranged. Check valve according to claim 1, characterized in that the housing ( 1 ) is designed as a metallic component. Check valve according to claim 5, characterized that performed on the metallic component, a heat treatment is. Check valve according to claim 1, characterized in that the cage ( 2 ) consists of a plastic. Check valve according to claim 1, characterized in that the cage ( 2 ) with three cage struts ( 6 ) is designed as a tripod. Check valve according to claim 1, characterized in that the cage ( 2 ) with four cage struts ( 6 ) is designed as a quadruped. Check valve according to claim 1, characterized in that the pressure spring ( 4 ) is designed as a helical spring.