WO2014206601A1

WO2014206601A1 - Pressure control valve having a guide in the valve body

Info

Publication number: WO2014206601A1
Application number: PCT/EP2014/058699
Authority: WO
Inventors: Dietmar Uhlmann; Vittorio Caroli
Original assignee: Robert Bosch Gmbh
Priority date: 2013-06-24
Filing date: 2014-04-29
Publication date: 2014-12-31
Also published as: EP3014111A1; DE102013211924A1

Abstract

The invention relates to a pressure control valve (10), comprising a housing (20), which has an inlet opening (16) and an outflow opening (18); a valve pin (12), which is guided in the housing (20) and which has an actuating element (12b); and a sealing element (42, 42') at an end of the actuating element (12), which sealing element is designed to close a valve seat (14) when the valve pin (12) is moved, such that a fluid flow between the inlet opening (16) and the outflow opening (18) is interrupted. The valve seat (14) and an axial guide (26) of the actuating element (12b) are provided by a one-piece valve body (20b).

Description

description

Pressure control valve with guide in the valve body

Field of the invention

The invention relates to a pressure control valve, for example, in a

Fuel supply system of a vehicle is used.

Background of the invention

In vehicles, pressure control valves are used, for example, to regulate a pressure in a high pressure region of a common rail injection system at a certain level. Such a pressure regulating valve usually has an actuator in the form of an electromagnet, which can move a valve pin or pressure pin in a valve pin bore and a

Sealing element, such as a valve ball, by the magnetic force in one

Valve seat holds to close the pressure control valve.

In known pressure control valves, the valve pin is held in an axial guide which is embodied in a separate component from the valve seat, whereby an axial offset can be present between the guide of the valve pin and the valve seat. In most cases, the interface between the valve pin and the sealing element is therefore designed so that the lateral

Movement of the sealing element in favor of a quiet operation is prevented (for example by means of a deep dome, in which a valve ball is partially recessed). This radial bonding of the sealing element with the valve pin can in

Combination with the above axis offset between the leadership of the Valve pin and the valve seat cause the valve is not tight or has a closing delay or hysteresis.

To circumvent this, for example, the dome is stamped on the valve pin in the assembled state to compensate for the axial offset. Also become tolerances with respect to coaxiality for a valve body, a

Valve housing and the valve pin concentrated. These measures are usually associated with increased costs and / or deteriorated output.

Summary of the invention

It is an object of the invention to provide a cost-effective, easy to manufacture and tight closing pressure control valve.

This object is solved by the subject matter of the independent claim. Further embodiments of the invention will become apparent from the dependent claims and from the following description.

The invention relates to a pressure control valve, which can be installed, for example, in the housing of a high pressure pump of a common rail injection system.

According to one embodiment of the invention, the pressure regulating valve comprises a housing having an inlet opening and an outlet opening; one in

Housing guided valve pin with an actuator; a sealing element at one end of the actuating element, which is designed to close a valve seat upon movement of the valve pin, so that a fluid flow between the inlet opening and the outlet opening is interrupted. The valve seat and an axial guide of the actuating element are of a

provided one-piece valve body.

In this way, the actuator can be performed in the same component in which the valve seat is included. Thus, an axial offset between the guide of the actuating element and the valve seat can be avoided, which by a simplified manufacturing process at a cost reductions ucierung can lead. In addition, a better axial alignment generally leads to a centric force introduction to the actuating element and / or the sealing element and thus to a reduction of wear and hysteresis. Furthermore, the tightness of the valve can be improved. Also, expensive, non-robust method, such as the internal embossing of the actuating element on the sealing element, can be omitted in the manufacture of the pressure regulating valve.

A greatly improved coaxiality between the leadership of the

Actuator and the valve seat can by machining the guide and valve seat with a single tool (for example, a

Step tool) can be achieved.

The valve body may be a part of the housing in which the

Sealing element (for example, a ball) and the valve seat (for example, a conical surface) are provided.

A guide for the actuator or more generally a guide for the valve pin may be an axial bore / opening in the valve body or housing. This bore or opening may have the same cross-sectional area as the actuating element or the valve pin.

According to one embodiment of the invention, the valve body, the

Outflow opening in the axial direction before the guide for the

Actuator is arranged. For example, when the pressure regulating valve is in the open state, the fluid can flow from the inlet opening into a space in front of the actuating element and leave the pressure regulating valve there through the outlet opening again.

According to one embodiment of the invention, the pressure regulating valve further comprises a spring in the valve body, which is designed to

Push actuator in the axial direction of the valve seat. This spring can ensure that in a multi-piece valve pin, the individual parts, such as the actuator and an anchor pin, even when the valve is open contact. According to one embodiment of the invention, the valve pin comprises an anchor pin which is supported on the actuating element. In other words, the valve pin may comprise several parts. The pressure regulating valve may comprise an actuator for moving the anchor pin, which may be, for example, a coil or an electromagnet. The separate from the anchor pin actuator can

(For example, via an intermediate element or a cap on the anchor pin) be supported on the anchor pin and be moved by this with. When the valve is open, i.e., the seal member is not seated on the valve seat, fluid, such as fuel, may flow between the input port and the discharge port, and a pressure in front of the input port may be relieved.

According to one embodiment of the invention, the housing comprises a separate housing part separated from the valve body with a guide for the

Anchor pin. The housing can also be constructed in several parts. In this way, the two housing parts can be made of different materials. The guide for the actuator is integrated into the valve body, which is usually made of a hard material to prevent wear of the valve seat. The further housing part may be made of a softer material.

It is also possible, the housing of the pressure control valve in terms

to optimize magnetic properties, since, for example, the other housing part may be softer. Thus, the magnetic force can be increased and material and costs in the area of the magnet can be saved.

According to one embodiment of the invention, the valve body is sleeve-like pushed over the further housing part and connected thereto. The valve body may be constructed, for example, cup-like, wherein the inlet opening is arranged in its bottom. With a part of its wall, the valve body can be screwed onto the further housing part.

According to one embodiment of the invention, the pressure regulating valve further comprises a spacer disc between the valve body and the further housing part. With this disc, the distance between the sealing element and the valve set can be adjusted. According to one embodiment of the invention, the pressure regulating valve further comprises an anchor pin cap between the anchor pin and the

Actuator, which is discontinued on one end of the actuating element. The anchor pin cap can act as a mechanical power transmission element between the anchor pin and the actuator. If the anchor pin is hollow and designed to conduct fluid, the anchor pin cap may additionally have a through opening through which fluid can be introduced into the anchor pin. But it is also possible that a hollow anchor pin has lateral openings into which the fluid can flow.

According to one embodiment of the invention, the actuating element has at least one side channel, so that fluid can flow past the actuating element through the guide for the actuating element. In this way, fluid can flow in the direction of the anchor pin and from there in the direction of the discharge opening.

The actuating element may be a body with a cylindrical basic shape, which may have a tip at the end with the sealing element. In this tip, there may be a dome that can accommodate the sealing element. The actuator may be molded by MIM (metal injection molding).

According to one embodiment of the invention, the valve pin is at least partially hollow and provides a connection for the fluid to the discharge opening. For example, the valve pin can be designed as a tube.

According to one embodiment of the invention, the sealing element comprises a valve ball which is separate from the actuating element. This can be located in a dome at the top of the actuator. But it is also possible that the sealing element is part of the actuating element or with this

is made integral / one piece.

Brief description of the figures Embodiments of the invention will now be described in detail with reference to the accompanying drawings.

Fig. 1 shows a longitudinal section through a pressure regulating valve according to a

Embodiment of the invention.

Fig. 2 shows a longitudinal section through a pressure regulating valve according to another embodiment of the invention. Fig. 3 shows a longitudinal section through a portion of a pressure regulating valve according to another embodiment of the invention.

Fig. 4A shows a side view of an actuating element for a

Pressure control valve according to another embodiment of the invention.

Fig. 4B shows a sectional view of the actuator of Fig. 4A. Fig. 4C shows a front view of the actuator of Fig. 4A. FIG. 4D shows a perspective view of the actuator of FIG. 4A. FIG.

Basically, identical or similar parts are the same

Provided with reference numerals.

Detailed description of embodiments

Fig. 1 shows a longitudinal section through a pressure regulating valve 10, which comprises a multi-part pressure pin or valve pin 12 which can be pressed by means of magnetic force against a valve seat 14 to a flow of a fluid (such as

Fuel for a vehicle) from an input port 16 into an outflow port 18.

The valve pin 12 has an anchor pin 12a and an actuator 12b, which are arranged one behind the other in a multi-part housing 20, are guided by this in an axial direction A and in the axial direction A. aligned axially. The anchor pin 12a has a smaller diameter than the actuator 12b.

The anchor pin 12a is in a first housing part 20a and the

Actuating element 12b is guided in a second housing part 20b or valve body 20b, wherein the valve body 20a is connected to the first housing part 20a via a screw connection 22. Between the housing part 20a and the valve body 20b, a sealing ring 23 is arranged. In the first housing part 20a is an axial guide opening 24 for

Guide the anchor pin 12a. In the second housing part 20b is an axial guide opening 26 for guiding the actuating element 12b. The two guide openings each have the same inner diameter as the corresponding outer diameter of the anchor pin 12 a and

Actuator 12b.

In the housing part 20a, an actuator 28 in the form of a coil surrounding the anchor pin 12a coil 28 is arranged, which generates a magnetic field when energized, which acts on an anchor plate 30 which is attached to one end of the anchor pin 12a.

The anchor plate 30 is disposed in an opening 32 in the housing 20, which is formed between a valve cover 34 and the housing part 20 a. The valve cover 34 is placed on the housing part 20a. Between the housing part 20 a and the valve cover 34, a further sealing ring 36 is arranged.

The valve cover 34 provides the axial outflow opening 18, which is opposite to the axial inlet opening 16. Further, the valve cover 34 has an electrical interface 38 in which electrical contacts, such as

Plug pins are arranged to energize the coil 28.

The valve seat 14 is formed in the valve body 20b, for example in the form of a conical seat. The valve seat 14 is located in the axial direction A.

opposite a tip 40 of the actuator 12b, on which a valve ball 42 is located. The inlet opening 16, in the valve seat 14th opens and extends through the valve body 20b in the axial direction A, is covered with a cup-shaped filter 44 which is fixed to the valve body 20b.

The pressure regulating valve 10 can be fixed by means of the valve body 20b in a rail tube 46 of a common rail system, for example via a

Screw connection 48.

Between the housing part 20 a and the valve body 20 b is a

Shim 50 is arranged, with which the distance between the valve tip 40 and the valve seat 14 can be adjusted in the axial direction.

On the anchor pin 12a an anchor pin cap 52 is attached, which is discontinued at one end 54 of the actuating element 12b.

If the pressure control valve 10 is not energized, a valve spring 56 pushes the

Anchor plate 30 together with the anchor pin 12a in the axial direction A away from the valve seat 14. As a result of the pressure of the fluid in the inlet opening 16, the actuating element 12b with the valve ball 42 is also moved in this direction.

In Fig. 1, the valve pin 12 serve as its components, the anchor pin 12a, the anchor pin cap 46 and the actuator 12b, not only for

Power transmission, but also to the fluid line. For this purpose, the anchor pin 12a is hollow or tubular and has a hollow channel 58 in its interior. The actuator 12b has lateral, axial channels 60 and grooves 60, respectively. The anchor pin cap 46 is adapted to fluid flow out of the

Redirect side channels 48 in the hollow channel 47 of the anchor pin 12 a and has to a flow-through opening 62 on.

With the pressure control valve 10 open, fluid can now flow in a substantially axial fluid flow from the inlet opening 16 past the valve ball 42 through the side channels 60, is then deflected by the anchor pin cap 46 in the hollow channel 58 of the anchor pin 12a to there in the direction of

Outflow opening 18 to flow. FIG. 2 shows a further embodiment of a pressure regulating valve 10, in which the actuating element 12b has an integrally formed sealing element 42 '. Since the guide opening 26 and the valve seat 14 are arranged in the same component 20b, this allows a much more precise position of these two components 12b, 14 to each other. In this way, the sealing element 42 'already at

Manufacture of the actuator 12 b are centered exactly.

Next is the pressure control valve 10 of FIG. 2, a spring 64 in the

Guide opening 26 is disposed between the valve seat 14 and the actuator 12 b, which can push the actuator 12 b in the direction of the anchor pin 12.

The anchor pin plate 52 'of Fig. 2 has no openings, but closes the end of the anchor pin 12a. Instead, the anchor pin 12a has lateral openings 66 through the fluid flowing on the actuator 12b

has passed, can flow into the cavity 58 in the anchor pin 12a.

In Fig. 2, the outer diameter of the anchor pin 12a is greater than the outer diameter of the actuating element.

Otherwise, the pressure control valve of FIG. 2 may be constructed the same as that of FIG. 1.

3 shows a front section of a further embodiment of a pressure regulating valve 10, in which the actuating element 12b has no side channels, but the fluid flows directly from a Absteuerraum 68 between the actuating element 12b and the valve seat 14 in the outflow openings 18, the side and in Radial direction in the valve body 20b are provided. In Fig. 3 it can be seen that the sealing element 42 in the form of a

Valve ball can be arranged in a cap 70 in the tip 40 of the actuator 12 b. Due to the good centering by the guide 26, the cap 70 may be prefabricated in the actuator 12b. One

complicated embossing process in the assembled state is no longer necessary. Since the production of the dome 70 does not necessarily have to be made by embossing, an increase in the dome depth is possible. A side Vibration movement of the valve ball 42 due to the instability of the flow in the Absteuerraum 68 is thus avoided effectively. Consequently, the robustness against the generation of disturbing noises is greater.

Another advantage is the ability to interpret the hardness of the actuator 12b regardless of the depth of the cap 68. The actuator 12b can be designed harder and thus be more robust against transport and handling damage.

The actuating element 12b has at its end 54 in the direction of the anchor pin 12a a spherical surface with a radius R. The radius R is designed so that the center of the theoretical sphere is identical to the center of the dome 70. This ensures that the introduction of force from the actuator 22 to the actuating element 12b and from the actuating element 12b to the sealing element 42 is always centric, even if the actuating element 12b tilts slightly within the clearance of the guide 26.

When opening and closing the valve 10, the sealing element 42 is taken over the dome 70 from the actuator 12b. Especially when closing is ensured thanks to the good coaxiality between the guide 23 and the valve seat 14 that the sealing element 42 hits the valve seat 14 centrally. Thus, it is avoided that the valve ball 42 must slide with significant friction losses along one side of the valve seat 14 and that the

Actuator 12b canted due to the lateral reaction forces. Consequently, the robustness increases over a closing hysteresis.

Otherwise, the pressure control valve of FIG. 3 may be constructed the same as that of FIG. 1 or 2.

Figs. 4A to 4D show the actuator 12b from different views. The actuating element has a cylindrical base body, which merges at one end into a point 40 with the dome 70. At an opposite end, it has a rounded surface 54.

The actuating element 12b has three side channels 60, which extend in the axial direction A. Each of the side channels 60 has one circular segment-shaped cross section. In the area of the top 40 of the

Actuator 12 b, the cross-section of the side channels 60 expands so that they touch the dome 70.

In addition, it should be understood that "comprising" does not exclude other elements or steps and "a" or "an" does not exclude a multitude. "Further, it should be noted that features or steps described with reference to one of the above embodiments also in combination with other features or steps of others described above

Embodiments can be used. Reference numerals in the

Claims are not intended to be limiting.

Claims

claims

A pressure regulating valve (10) comprising:

a housing (20) having an inlet opening (16) and an outlet opening (18);

a guided in the housing (20) valve pin (12) with a

Actuating element (12b);

a seal member (42, 42 ') at one end of the actuator (12) adapted to close a valve seat (14) upon movement of the valve pin (12) such that fluid flow between the input port (16) and the discharge port (18) is interrupted;

characterized in that

the valve seat (14) and an axial guide (26) of the actuating element (12b) are provided by a one-piece valve body (20b).

2. Pressure control valve (10) according to one of the preceding claims,

wherein the valve body (20b) has the discharge opening (18) which is arranged in the axial direction (A) in front of the guide (26) for the actuating element (12b).

3. Pressure control valve (10) according to one of the preceding claims, further comprising:

a spring (64) in the valve body (20b) adapted to

Actuator (12b) in the axial direction (A) of the valve seat (14) to push away.

4. Pressure control valve (10) according to one of the preceding claims,

wherein the valve pin (12) comprises an anchor pin (12a) mounted on the

Actuator (12b) is supported;

wherein the housing (20) comprises a further housing part (20a) separated from the valve body (20b) with a guide (24) for the anchor pin (12a).

5. Pressure control valve (10) according to claim 4,

wherein the valve body (20b) is sleeve-like pushed over the further housing part (20a) and connected thereto.

6. Pressure control valve (10) according to claim 4 or 5, further comprising:

a spacer plate (50) between the valve body (20b) and the further housing part (20a).

The pressure regulating valve (10) according to any one of claims 4 to 6, further comprising: an anchor pin cap (52, 52 ') between the anchor pin (12a) and the actuator (12b) mounted on one end (54) of the

Actuator (12b) is discontinued.

8. Pressure control valve (10) according to one of the preceding claims,

wherein the actuator (12b) has at least one side channel (60) such that fluid can flow past the actuator (12b) through the guide (26) for the actuator (12b).

9. Pressure control valve (10) according to one of the preceding claims,

wherein the valve pin (12) is at least partially hollow and provides a connection for the fluid to the discharge opening (18).

10. Pressure control valve (10) according to one of the preceding claims,

wherein the sealing element (42) comprises a valve ball separated from the actuating element (12b).