WO2007093571A1

WO2007093571A1 - Non-return valve

Info

Publication number: WO2007093571A1
Application number: PCT/EP2007/051314
Authority: WO
Inventors: Reinhard Koch; Rainer Fuhrmann; Stefan Grossmann
Original assignee: Schaeffler Kg
Priority date: 2006-02-18
Filing date: 2007-02-12
Publication date: 2007-08-23
Also published as: DE102006007583A1

Abstract

The invention relates to a hydraulic valve (1), designed as a non-return valve, which comprises a housing (4) which is of two-part design, wherein an inner part (6a) is integrated into an outer part (5a), and said components are captively held in a form-fitting manner by means of a fixing.

Description

Name of the invention

check valve

Field of the invention

The present invention relates to a check valve designed as a hydraulic valve that is acted upon by a fluid flow, for example, is inserted in a receiving bore of a machine housing. The valve comprises a housing, with a spring-loaded valve body positioned in the region of a fluid inlet, which forms the backstop in conjunction with a valve seat.

Background of the invention

Such designed as a check valve hydraulic valves are known in different embodiments. DE 100 19 534 A1 relates to a non-return valve, with a non-cutting metal housing enclosing an insert, in which a spring-loaded valve body is included. The valve body forms a backstop together with a valve seat of the housing, wherein the valve seat is acted upon by a fluid flow. At a fluid pressure that exceeds the spring force of the valve body, the valve body shifts from the valve seat and allows fluid flow through the hydraulic valve, in which the fluid flows through a bypass channel. The construction of this known valve requires a complex assembly, wherein the outer part made of non-cutting metal sheet after assembly of the insert which includes the valve body is secured by means of a deformation.

From DE 6 95 921 A1 designed as a throttle valve one-way valve or check valve is known, which is used for a pressure-medium-actuated vehicle clutch. The valve allows for unimpeded pressure fluid flow from the master cylinder to the slave cylinder of the hydraulic see clutch operation. At a pressure medium flow reversal, however, the hydraulic valve is closed except for a small-sized Absteuerbohrung, which sets a desired delayed engagement of the vehicle clutch. The known valve includes a conical seat causing high manufacturing costs.

Object of the invention

Considering the disadvantages of the known embodiments, it is an object of the invention to realize a hydraulic valve or check valve, which comprises easily manufacturable components, which are inexpensively joined together without further rework and allows the inclusion of a sealing element.

Summary of the invention

According to the features of the main claim, the hydraulic valve according to the invention advantageously comprises a rotationally symmetrical, two-piece designed housing, which is inserted or pressed in the installed state in a bore. For this purpose, the interference fit can be carried out so that it seals immediately. Alternatively, the invention includes a separate seal between the housing and a receiving bore into which the hydraulic valve is inserted. The housing comprises an outer housing forming the valve seat, and an inner part, with integrated valve body and associated spring means. The two components forming the housing are designed so that they are axially assembled and positively held, secured against loss. Advantageously, the structure according to the invention of the hydraulic element requires, after assembly of the housing components in comparison to known solutions, no subsequent mechanical rework, such as the flanging of a sheet-metal jacket. Furthermore, no position-oriented assembly of the individual components of the housing is advantageously required. The concept of the hydraulic valve according to the invention allows the use of cost-effective manufacturing processes for the production of the outer part and the inner part, which together form the housing. Further advantageous embodiments of the invention are the subject of the dependent claims 2-12.

The invention includes an effective decay protection of all components of the hydraulic valve, with which the inner part and the outer part are effectively fixed in position in the end position positively and / or non-positively. Advantageously, the outer part and the inner part are each pot-shaped executed in mutually different dimensions. For this purpose, the inner part is inserted into the receptacle of the outer part, wherein these components are fixed in the end position by means of a form-locking, detachable and / or non-detachable fuse. Even with a transport so all components are assembled secured against loss.

In the installed state, the hydraulic valve is preferably effectively sealed by means of a separate seal. For this purpose, preferably a hydraulic element on the outside enclosing sealing element, which effectively seals a gap between the outer part and an inner wall of the receiving bore.

As a sealing element is preferably an O-ring or a round rubber ring, for which a special receptacle, annular groove or circumferential groove is provided in the region of the lateral surface of the hydraulic valve. For a hydraulic valve according to the invention, in which a wall thickness reduced, radially stepped end portion of the outer part engages positively in an axially aligned annular gap of the inner part, the O-ring or the round rubber ring is inserted into a receptacle which axially from the end face of the outer wall, and one example obliquely or inclined running contour of the outer part is limited.

A further preferred embodiment of the hydraulic valve comprises an outer part with a one-sided wall thickness reduced and radially stepped end region. This area engages positively in an axially aligned annular gap of the inner part. The concept locally forms a radial overlap which improves the holding fit between the inner part and the outer part and further Furthermore, the stiffness in the wall area optimized, which allows a reduced wall thickness.

An effective form-locking position fixation between the inner part and the outer part can be effected by means of a circumferential bead or partially arranged snap lugs. The inside arranged on an outer wall of the annular gap bead or the snap lugs engage in the installed state positively in a circumferential groove of the outer part.

As an alternative to an inner part forming an annular gap, the invention includes an inner part with at least two axially aligned ribs. In the installed state, the ribs are fitted in outer axially extending longitudinal grooves of the outer part. For securing the position end-side, inwardly directed snap lugs engage positively in associated recesses of the outer part.

Advantageously, the outer part is made in comparison to the inner part of a material of higher strength. This measure reduces the wear of the valve seat, which is assigned to the outer part. Preferably, the outer part is made of metal and the inner part made of plastic. Due to the shape of the inner part, it makes sense to make this as a plastic injection molded part, which is inexpensive to produce, even for large quantities.

According to the invention, a receptacle of the outer part is designed so that it completely receives the inner part, whereby the hydraulic valve rests only on the outer surface of the outer surface on the inner wall of the receiving bore, for example, a machine part.

For such a hydraulic valve concept, a positive positional fixing is preferably achieved by means of a radial indentation in a wall thickness reduced area of the outer part, which cooperates with a corresponding shaping of the inner part. For this purpose, it is advisable to mold into an inwardly directed bead in the outer part, which cooperates with a corresponding circumferential groove of the inner part. Alternatively, the wall thickness reduced wall the outer part are provided with a partial or circumferential radially outward enforcement, snapped into the mounting position, a corresponding cam or projection of the inner part form fit.

Brief description of the drawings

Embodiments illustrate the hydraulic valve according to the invention. Show it:

Figure 1 shows an inventive hydraulic valve in the installed state;

Figure 2 in a view an alternative to the hydraulic shown in Figure 1 ikventi I;

3 shows in a half section the hydraulic valve according to Figure 2;

FIG. 4 shows a hydraulic valve in which the inner part is completely integrated in the outer part;

Figure 5 is a comparable to Figure 4 hydraulic valve with a differently shaped positive positional fixation.

Detailed description of the drawings

1 shows an inventive hydraulic valve 1 in the installed state, integrated in a machine part. The rotationally symmetrical designed hydraulic valve 1 is inserted into a receiving bore 3 of the machine part 2 and is acted upon by a fluid flow in the direction of the arrow. The hydraulic valve 1 comprises a rotationally symmetrical housing 4, consisting of an outer part 5a and an associated inner part 6a, which are designed in a matching pot-like manner. The preferably non-cutting metal outer part 5a is inserted while maintaining a gap 7 in the receiving bore 3 of the machine part 2. Made of plastic provided, preferably designed as an injection molded part inner part 6a is arranged in a receptacle 8 of the outer part 5a. At the end, the inner part 6a forms an axially aligned circumferential annular gap 9, in which a wall thickness reduced end portion 10 of the outer part 5a is fitted and thus held non-positively. To achieve an effective position fixation and at the same time decay protection of the housing 4, a fuse 11 is provided between the inner part 6a and the outer part 5a in the region of overlapped areas.

The hydraulic valve 1 includes a ball-shaped valve body 12, which is acted upon by a spring means 13, in particular a compression spring, in the direction of the outer part 5a associated valve seat 29. A pending on the valve body 12 fluid flow moves the valve body 12 in the arrow direction as soon as the pressure generated by the spring means 13 is overcome. A lifted off from the valve seat 29 valve body 12 causes a flow through the hydraulic valve 1, in which the hydraulic fluid via a discharge channel 14 of the inner part 6a is controllable. A desired, effective sealing of the hydraulic valve 1 relative to the machine part 2 with the valve closed is achieved by means of a sealing element 15. The purpose of this is an O-ring or a round rubber ring, which is supported on the outside on the inner wall 16 and on the inside on a lateral surface 17 of the outer part 5a. The exact mounting position of the sealing element 15 is axially limited by an end face 18 of the inner part 6a and a radially stepped end portion 19 of the outer part 5a. Furthermore, the hydraulic valve 1 is assigned an inserted into an annular groove 21 of the machine part 2 circlip 20 on which the hydraulic valve 1 is supported with an end face of the inner part 6a, wherein the locking ring 20 defines the mounting position within the machine part 2.

FIG. 2 shows the hydraulic valve 1 in a view as a single part. In this case, the inner part 6b comprises a plurality of, preferably four symmetrically circumferentially distributed, ribs 22 which enclose the radially stepped end region 19 of the outer part 5b. As a supplementary measure, it is advisable to provide the outer part 5b for receiving the ribs 22 with longitudinal grooves 23. The half-section according to FIG. 3 illustrates, in particular, the form-fitting fastening between the outer part 5b and the inner part 6b. For this purpose, the inner part 6b forms an axially aligned annular gap 9 for receiving the wall thickness-reduced end section 10 from the outer part 5b. The annular gap 9 is bounded on the outside by an outer wall 24, which has a radially inwardly directed bead 25 or a shoulder at the free end in the region of the end face 18. The bead 25 engages positively in an end position in a corresponding circumferential groove 26 of the outer part 5b. This results in a fixation 27a, via which all components of the hydraulic valve 1 are joined together. The fixation 27a thus provides an effective decay protection for the transport of the prefabricated hydraulic valve 1. The fixation 27 can be used both for an eyestattenes with ribs 22 inner part 6b and for an inner part with a closed, a lateral surface forming outer wall 24, with a circumferential Bead 25 or partially arranged, radially inwardly directed cam or projections is provided, which engage in correspondingly corresponding recesses or a circumferential groove 26 of the outer part.

Figures 4 and 5 show the hydraulic valve 1, provided with structurally deviating designed components, the outer part 5c, 5d and the inner part 6c, 6d. The inner part 6c, 6d, which can also be referred to as a plastic cartridge, is completely integrated into the receptacle 28 of the outer part 5c, 5d. For this purpose, the outer part 5c, 5d forms a closed stepless lateral surface 17, which extends over the component length of the inner part 6c, 6d. To fix the components outer part 5c with the inner part 6c, the fixation 27b is provided according to Figure 4, in which the wall 30 of the outer part 5c locally or circumferentially a molded bead 31 includes, which cooperates with a corresponding recess 32 of the inner part 6c. The bead 31 designed on the outside as a constriction can preferably be used to receive the sealing element 15.

An alternative to Figure 4 alternatively designed fixation 27c is shown in Figure 5. There- To the wall 30 preferably partially a radially outwardly directed formation 33, into which engages a correspondingly shaped projection 34 of the inner part 6d.

LIST OF REFERENCE NUMBERS

1. Hydraulic valve

2. Machine part

3. receiving bore

4. Housing

5a outer part

5b outer part

5c outdoor unit

5d outdoor unit

6a inner part

6b inner part

6c inner part

6d inner part

7 gap

8 recording

9 annular gap

10 end section

11 fuse

12 valve body

13 spring means

14 outflow channel

15 sealing element

16 inner wall

17 lateral surface

18 front side

19 end area

20 circlip

21 ring groove

22 rib

23 longitudinal groove

24 outer wall

25 bead 26 circumferential groove

27a fixation

27b fixation

27c fixation 28 recording

29 lateral surface

30 wall

31 bead

32 recess 33 molding

34 approach

Claims

claims

Hydraulic valve, which is acted upon by a fluid flow and in a receiving bore (3) of a machine part (2) is inserted, comprising a housing (4), with a positioned in the region of a fluid inlet, spring-loaded valve body (12), in conjunction with a Valve seat (29) forms a backstop, characterized by a rotationally symmetrical, two-piece designed in the installed state in the receiving bore (3) inserted or pressed and sealed directly or by a separate seal housing (4), wherein the valve seat (29) forming the outer part ( 5a-5d) and a the valve body (12) and an associated spring means (13) containing the inner part (6a - 6d) positively and / or positively joined together and a securement (27a - 27c) are held secured against loss.

2. Hydraulic valve according to claim 1, whose outer part (5a - 5d) and its inner part (6a - 6d) are designed cup-like, wherein the inner part (6a - 6d) in a receptacle (28) of the outer part (5a - 5d) is inserted ,

3. Hydraulic valve according to claim 1, which in the installed state for sealing a gap dimension (7) between a lateral surface (17) of the outer part (5a-5d) and an inner wall (16) of the machine part (2) enclosing the hydraulic valve (1) sealing element ( 15) is provided.

4. A hydraulic valve according to claim 3, wherein as the sealing element (15) for sealing the gap dimension (7), an O-ring or a round rubber ring is provided.

5. A hydraulic valve according to claim 1, provided with a wall thickness reduced, radially stepped end portion (19) of the outer part (5a, 5b), the form-fitting manner in an axially aligned annular gap (9) of the inner part (6a, 6b) engages.

6. Hydraulic valve according to claim 5, wherein an outer wall (24) of the annular gap (9) of the inner part (6a, 6b) includes a radially inwardly directed circumferentially or partially arranged bead (25) or snap lugs, the form-fitting manner in a correspondingly arranged Umlaufnut (26) of the outer part (5a, 5b) engage.

7. Hydraulic valve according to claim 1, whose inner part (6b) comprises at least two axially extending ribs (22) in the installed state, the radially stepped wall thickness reduced end portion (19) of the outer part (5b) overlap and by means of end-side snap lugs or the bead (25) in the circumferential groove (26) of the outer part (5b) engage.

8. A hydraulic valve according to claim 7, wherein the ribs (22) of the inner part (6b) in outer axially extending longitudinal grooves (23) of the outer part (5b) are fitted.

9. A hydraulic valve according to claim 1, wherein the outer part (5a - 5d) compared to the inner part (6a - 6d) is made of a material of higher strength.

10. Hydraulic valve according to claim 9, the non-cutting metal producible outer part (5a - 5d) is combined with a designed as an injection molded part inner part (6a - 6d) made of plastic.

1 1. A hydraulic valve according to claim 1, whose outer part (5c, 5d) forms a receptacle (28) in which the inner part (6c, 6d) is fully integrated.

12. Hydraulic valve according to claim 11, wherein the outer part (5c, 5d) in the region of the lateral surface (17) comprises a radially inwardly or radially outwardly directed bead (31) or formation (33), for forming a fixation (27b , 27c) cooperates positively with a recess (32) or a projection (34) of the inner part (6c, 6d).