WO2011057702A1

WO2011057702A1 - Valve having protection from disassembly and installation aid

Info

Publication number: WO2011057702A1
Application number: PCT/EP2010/006324
Authority: WO
Inventors: Adrian Jerchen; Thorsten Geiger; Ludmilla Graf
Original assignee: Robert Bosch Gmbh
Priority date: 2009-11-14
Filing date: 2010-10-15
Publication date: 2011-05-19
Also published as: DE102009053388A1

Abstract

The invention relates to a valve having a valve housing (1) consisting of at least two housing parts (1a-1d) screwed or fitted into each other and a protection from disassembly in the form of a resiliently or plastically deformable ring (23-25). The ring is inserted in corresponding circumferential grooves (11-13, 26-28) radially placed between the at least two housing parts screwed or fitted into each other. According to the invention, an installation aid is provided for the protection from disassembly, which installation aid substantially consists of an insertion taper (29-31), which is formed or arranged on the one of the housing parts to be screwed/fitted together, as well as a ring driving element (20-22), which is formed or arranged on the other of the two housing parts.

Description

Valve with dismantling protection and mounting aid

description

The present invention relates to a valve with dismantling protection and an on / in the valve provided assembly aid for the disassembly protection preferably according to the preamble of claim 1. In the prior art hydraulic / pneumatic valves, for example in the form of pressure relief valves are known, basically consisting of a housing, in which at least one valve piston or coil is mounted axially displaceable. In some embodiments, the valve is configured as a so-called valve cartridge which is press-fitted into the housing of an integrated hydraulic / pneumatic control system

is screwed. In order to form a chamber receiving the valve piston, the valve housing is often composed of a plurality of sleeve-shaped housing parts, which are preferably screwed or plugged into each other in the axial direction of the valve piston.

So that an unintentional subsequent pulling apart of the often under high hydraulic / pneumatic pressure housing parts is avoided in any case, a kind of dismantling protection is installed in the valve housing in the prior art. This may be u.a. to act a snap ring, which is inserted between two nested / inserted housing parts in correspondingly opposite circumferential grooves and thus forms an axial securing against pulling apart of the relevant housing parts. Although such a snap ring is a fairly reliable disassembly protection, but arise when mounting difficulties that the

Pinching / screwing the housing parts together or even damaging the housing parts may damage the snap ring. The invention is therefore based on the object to provide a valve of this type, with a disassembly protection, which is easy to install.

This object is generally achieved by a valve having the features of patent claim 1. Further advantageous embodiments of the invention are the subject of the dependent claims.

The basic idea of the invention provides the solution to the problem

Arrangement / forming a kind mounting aid in the valve housing or at the

Housing parts, which is used automatically during assembly of the housing parts. The mounting aid consists essentially of an insertion bevel, which is formed or arranged on one of the housing parts to be plugged / screwed together, and a snap ring, which is formed or arranged on the other of the two housing parts. When screwing / plugging the two

Housing parts of the snap ring is automatically carried along by the driver axially, the

Insertion bevel in coming into contact with the snap ring causes a continuous reduction or expansion of the snap ring diameter, depending on whether the slope is formed / arranged on the inner or outer housing part. As soon as the snap ring has passed a radially projecting collar of the insertion bevel in its continuous axial displacement, this snaps into the axially immediately behind the groove of the respective housing part and thus locks the two nested / screwed housing parts in the axial direction.

According to a preferred embodiment of the invention, the snap ring driver is formed by a circumferential annular shoulder or radially projecting nubs, which preferably represent a radial extension of the side wall of a circumferential groove in the respective housing part. This has the advantage that the snap ring during its installation is already in the circumferential groove of the one housing part and has to be moved by the driver only in the (in mounting position) opposite circumferential groove of the other housing part on the slope.

A further embodiment of the invention provides that the driver wall axially

opposite side wall of the circumferential groove conical (in the axial direction)

bevel, preferably at an angle between 30 ° - 50 ° and in particular of about 30 ° with respect to the egg screwing. Due to this oblique orientation of the in.

Screwing-in front groove wall can be disassembled by overcoming a corresponding Aufspreizkraft the snap ring the valve body again. That is, in this case, when the two housing parts are screwed on, the snap ring continuously slides over the conical groove wall and is thereby spread apart / compressed. In that regard, the conical groove wall is a counterpart to the one described above

However, insertion be acting in the screwing dar.

According to an advantageous embodiment of the invention, the insertion bevel and preferably also the conical groove wall is formed in the housing part. Alternatively, it is also conceivable to produce the insertion bevel and / or the conical groove wall by a sleeve-shaped adapter piece, on / in the housing part

pressed / welded / glued. It is also advantageous to form the driver in one piece on the corresponding housing part, wherein also here the driver can be generated by an up / pressed-shaft ring alternatively.

Finally, it may be provided in an advantageous manner to align the insertion bevel at an angle between 15 ° - 30 ° and preferably of about 20 ° with respect to the screwing in order to ensure a uniform sliding of the snap ring during its assembly.

The invention will be explained below with reference to a preferred embodiment with reference to the accompanying drawings. The only figure shows

- The longitudinal section of a pressure relief valve according to the preferred

Embodiment in which, by way of example, the mounting aid according to the invention is applied.

Before referring to the specific exemplary embodiment, it should be pointed out that the assembly aid according to the invention can in principle be used with any type of valve, in particular for the case where at least two components to be mounted axially one inside the other against inadvertent axial displacement to be secured. Also, it is quite possible to replace the snap ring described below solely as a disassembly protection by a different ring element, which can be radially / plastically expand radially. Finally, the following angle information is not absolute but can be from a

A person skilled in the art can be varied depending on the spring force of the ring used, as long as the trouble-free assembly / disassembly of the ring during assembly of the two components to be stuck / screwing is ensured.

The valve shown in the accompanying figure, here in the form of a pilot-operated

Pressure relief valve, which is designed as a valve cartridge, has a valve housing 1, in which a pressure chamber is formed for receiving a piston assembly. The valve housing 1 consists in the present case of several axially screwed together

Housing parts 1a-1d, preferably in a sleeve shape, which at their inner or

Outer walls with screw threads 2-4 are formed. In the present

Embodiment, the valve housing 1 is composed of four sleeve-shaped housing parts which are screwed into one another via the above-mentioned screw threads in the axial direction and thereby define the pressure or valve piston chamber extending in the axial direction. The respective inner housing part of each pair of housing parts screwed together is connected to an inner end face with a

Außenumfangsnut 5-7 provided, in which a sealing ring 8-10 is inserted, which is in sealing contact with the inner wall of the respective other outer housing part. in the

Axial distance to the respective sealing ring 8-10 is one of the two housing parts screwed together, in this case preferably the inner housing part, provided with a further Außenumfangsnut 11-13. This circumferential groove 11-13 is produced by a notch in the housing shell part, such that a front groove wall 14-16 viewed in the screwing direction forms a conical shape and the other, rear groove wall 17-9 forms a steep wall extending substantially perpendicularly to the screwing-in direction , The conical or conical groove wall 4-16 expands, starting from the groove bottom substantially continuously up to the outer surface of the relevant sleeve-shaped housing part and has an angle between 30 ° - max. 50 ° and preferably about 30 ° with respect to the screwing of the housing part.

The axially opposite groove wall 17-19 is formed as a steep wall, which extends perpendicular to the screwing and radially outward over the lateral surface of the each inner housing part to form an annular shoulder 20-22 or bead protrudes. In each of the outer circumferential grooves 11-13, a snap ring 23-25 is used in the present embodiment. The snap ring diameter and the radially outer diameter of each annular shoulder 20-22 are coordinated so that the outer diameter of the respective annular shoulder 20-22 is greater than the average diameter of the associated relaxed snap ring 23-25.

Axial between the Außenumfangsnut 11-13 and the sealing ring 8-10 receiving groove 5-7 of the respective inner housing part, the external thread 2-4 is formed on the respective inner housing part which is in engagement with an internal thread of the associated outer housing part.

The outer housing part in the figure is provided with an inner circumferential groove 26-28 radially opposite to each other in the mounting position of the respective housing pair pair of the outer circumferential groove 11-13 of the inner housing part, i. (seen in the screwing) is placed axially behind the internal thread 2-4 of the outer housing part. The inner circumferential groove 26-28 is thus in the region of the respective free end side of the outer housing part. The inner circumferential surface of each outer housing part is formed in the frontal section to a kind of insertion bevel 29-31. Concretely, the inner circumferential surface, starting from the free end face of the respective outer housing part, runs continuously radially inwards and thus forms an inner cone with a radially inwardly projecting collar 32-34 (conical section with the smallest diameter). This collar 32-34 simultaneously forms the rear side wall of the inner circumferential groove 26-28 as seen in the screwing-in direction. The cone section with the largest diameter is dimensioned so that the associated

Snap ring 23-25 can be easily inserted on the side of the respective inner housing part, i. the largest cone diameter corresponds (preferably with slight oversize) to the outer diameter of the relaxed snap ring 23-25. Basically, the assembly of one of the housing pairs mentioned in the following manner:

After the sealing ring 8-10 and the snap ring 23-25 are inserted into the respectively provided Außenumfangsnuten 5-7 and 11-13 of the inner housing part, the inner housing part inserted into the outer housing part of the free end side by a sliding movement. As soon as the external thread of the inner housing part engages in the internal thread of the outer housing part, further assembly takes place by a screw movement of the two housing parts. After a predetermined

Einschraubwegstrecke (depending on the respective thread lengths) comes the still relaxed snap ring 23-25 into contact with the inner cone 29-31 of the outer

Housing part and is pushed forward by the snap ring 20-22 (annular shoulder) of the inner housing part with continuous screwing on the inner cone 29-31 in the axial direction. Here, the snap ring 23-25 is gradually compressed until it has reached the radially inner collar 32-34 of the inner cone 29-31 and jumps over this snap. As a result of the sudden relaxation of the snap ring 23-25 with simultaneous expansion of the snap ring engages 23-25 in the inner circumferential groove 26-28 of the outer housing part and thus locks a further axial movement of the inner

Housing part with respect to the outer housing part.

As can be seen from the above description and the local angle information, the insertion bevel 29-31 of the outer housing part is designed with a smaller angle with respect to the screwing (valve longitudinal axis) than the conical

Groove wall 14-16 on the inner housing part. This means that the force required to insert the snap ring 23-25 into the inner circumferential grooves 26-28 is smaller than the force required to pull the snap ring out of the respective inner circumferential groove 26-28.

In other words, must for disassembly of the housing parts by

Unscrewing a larger force be used than for screwing. This greater effort is set over the angular extent of the conical groove wall 14-16 so high that an unwanted screwing is excluded.

In the following, the valve according to the invention will be described in detail.

The designed as a pressure limiting valve valve is essentially

formed rotationally symmetrical about its valve axis. The four housing parts form a connection piece 1a, a reducer 1b, a bushing 1c and an adjusting bush 1d. On the sleeve-shaped connection piece 1a, an external thread 35 is formed, via which the valve can be screwed into a not shown integrated hydraulic system. For sealing purposes, a sealing ring 36 is inserted into the outer groove of the connecting piece 1a, as viewed in the screwing-in direction, behind the external thread 35. The reducer 1 b is screwed via the external thread 2 in the connector 1 a and sealed by the sealing ring 8. Between the connection piece 1a and the

Reducer 1 b is a dismantling protection with the above construction (in

Screw-in direction behind the thread 2) installed.

The bush 1c is screwed in the same way in the reducer 1 b and the adjusting bush 1d in the bushing 1c, wherein each screw is secured by means of a dismantling protection with inventive design. In addition, the socket has 1c and the

Stellbuchse 1d seen on its outer lateral surface in the screwing behind the snap ring 24, 25 receiving Außenumfangsnut 12,13 another external thread 37, 38, on which a lock nut 39, 40 is turned on, against the respective free end of the reducer 1b and Bush 1c strikes.

In the connecting piece 1a, a main stage is arranged, which essentially consists of a main piston 41 which is displaceably guided in the connecting piece 1a along the longitudinal axis. In this case, it is acted upon by a system pressure on its front side facing the hydraulic system, while a main piston spring 42 and the pressure of the spring chamber 43 act on its other end face. The system pressure consequently acts in the opening direction of the main piston 41 and the spring force and the spring chamber pressure are directed in the closing direction of the main piston 41. For this purpose, the main piston spring 42. is supported on an intermediate piece 44, which is received in the connection piece 1a and firmly clamped between an inner shoulder 45 of the connection piece 1a and the reduction piece 1b.

In the main piston 41, a throttle channel 46 is provided, through which the system pressure is passed into the spring chamber 43.

At an inner peripheral portion covered by the main piston 41 in the design position, an inner circumferential groove 47 is formed on the connector 1a. Further, at a covered by the intermediate piece 44 inner peripheral portion of a circumferential groove 48th intended. Both grooves 47, 48 are in the installed state of the valve via tank lines fluidly connected to a system tank.

In the intermediate piece 44 and the reducer 1b is designed as a seat valve

Provided pressure relief valve, which consists essentially of a longitudinal channel 49, a valve seat 50 an adjoining valve body 51 (ball), on a

Pilot piston 52 is fixed, a pilot spring 53 and at least two radial tank channels 54 consists. The longitudinal channel 49 connects the spring chamber 43 with the valve seat 50. The valve body 51 is pressed against the valve seat 50 via the pilot piston 52 and via the pilot control spring 53. The radially extending tank channels 54 connect the valve seat 50 to the tank (not shown).

The pilot spring 53 is received in the reducer 1b and is supported on a rod-shaped spool 55 from. The spool 55 is in his for

Prevailing spring 53 near section via a first piston seal 56 in the sleeve 1 c sealingly mounted and axially displaceable and has in its center section a

Ring shoulder 57 with built-in second piston seal 58, which is slidably guided in the adjusting bushing 1d and sealing. Finally, in his to the pilot spring 53 remote section a third piston seal 59 with the second piston seal 58 smaller

Diameter arranged, which is also sealingly and slidably supported on the adjusting bush 1d. Between the second and third piston seal 58, 59 an override spring 60 is arranged, which is supported on the adjusting sleeve 1d and the annular shoulder 57 and thus biases the spool 55 in the direction of pressure relief valve. Furthermore, an annular space 61 sealingly bounded between the first and the second piston seal 56, 58, which is connected via a control pressure channel 62 with a control pressure port. This is arranged at a free end portion of the actuating sleeve 1d. The pressure within the annulus 61 thus biases the spool 55 against the override spring 60. Finally, a stop screw 63 is screwed into this at the free end portion of the actuating sleeve 1d in axial extension to the spool 55. This has a radially enlarged portion 63a, which rests on a sealing ring 64 on the adjusting bush 1d. The extended portion 63 a serves as a stop for the spool 55 and can by means of the Stop screw thread 63b adjusted in the longitudinal direction and locked by a lock nut 65.

Claims

claims

1. Valve with a valve housing (1) consisting of at least two in one another

screwed or plugged housing parts (1a-1d) and a disassembly protection in the form of an elastically or plastically deformable ring (23-25), the in

Circumferential grooves (11-13 and 26-28) radially between the at least two nested or plugged housing parts (1a-1d) is used, characterized by a mounting aid for the dismantling protection essentially consisting of an insertion bevel (29-31), which on the one of the together too

screwed / plug housing parts is formed or arranged, and a Ringmitnehmer (20-22), which is formed or arranged on the other of the two housing parts.

2. Valve according to claim 1, characterized in that the insertion bevel (29-31) is formed on an inner circumferential surface of the outer housing part and preferably extends to that Innenumfahgsnut (26-28) of the respective outer housing part, in which the deformable ring (23-25) is locked in the assembled state.

3. Valve according to one of the preceding claims, characterized in that the Ringmitnehmer (20-22) by an annular shoulder (20-22) is formed on the side of the inner housing part, seen in the insertion direction immediately behind that Außenumfangsnut (11-13) the inner housing part, in which the deformable ring (23-25) is locked in the assembled state, wherein

Preferably, the annular shoulder (20-22) projects radially beyond the inner circumferential surface of the inner housing part.

4. Valve according to claim 1, characterized in that the insertion bevel (29-31) is formed on an outer circumferential surface of the inner housing part and preferably extends to that Außenumfangsnut (26-28) of the relevant outer housing part, in which the deformable ring (23-25) is locked in the assembled state.

5. Valve according to claim 4, characterized in that the Ringmitnehmer (20-22) by an annular shoulder (20-22) is formed on the side of the outer housing part, seen in the insertion direction immediately behind that Außenumfangsnut (1 1- 13) of the outer housing part is located, in which the deformable ring (23-25) is locked in the assembled state, wherein preferably the annular shoulder (20-22) projects radially beyond the outer circumferential surface of the outer housing part.

6. Valve according to one of the preceding claims, characterized in that the deformable ring (23-25) receiving circumferential groove (11-13) on the part of the Ringmitnehmer (20-22) having housing part a cone-shaped

slanted groove wall (14-16) has, seen in the insertion direction axially in front of the Ringmitnehmer (20-22) and when removing the inner housing part with respect to the insertion (29-31) causes opposite deformation of the ring (23- 25).

7. Valve according to claim 6, characterized in that the insertion bevel (29-31) with respect to the insertion direction has a smaller angle of attack than the conically tapered groove wall (14-16).

8. Valve according to one of the preceding claims, characterized in that the diameter of the insertion bevel (29-31) in that portion which has first contact upon insertion of the inner housing part with the ring (23-25), substantially the outer or inner diameter of the ring (23-25).

9. Valve according to one of the preceding claims, characterized in that the effective diameter of the Ringmitnehmers (20-22) substantially corresponds to the mean diameter of the ring (23-25).

10. Valve according to one of the preceding claims, characterized by a

Sealing ring (8-10), which is arranged between the outer and inner housing part and is seen in the insertion direction upstream of the dismantling protection.

11. Valve according to one of the preceding claims, characterized in that the deformable ring is a snap ring.

12. Valve according to one of the preceding claims, characterized in that the insertion bevel (29-31) with respect to the insertion direction has an angle of attack between 15 ° and 30 ° and preferably about 20 °.

13. Valve according to one of the preceding claims, characterized in that the conical groove wall (14-16) with respect to the insertion direction has an angle of incidence between 30 ° and 50 ° and preferably about 30 °.