WO1998033687A1

WO1998033687A1 - Multiple way control valve

Info

Publication number: WO1998033687A1
Application number: PCT/EP1998/000394
Authority: WO
Inventors: Johann Jungbecker; Manfred Rüffer
Original assignee: Continental Teves Ag & Co. Ohg
Priority date: 1997-02-01
Filing date: 1998-01-24
Publication date: 1998-08-06
Also published as: DE19703759A1; EP0956224A1; JP2001509752A

Abstract

An electromagnetically controllable multiple way control valve for hydraulic, anti-lock motor vehicle brake systems puts at least one wheel brake (wheel) in fluid communication with a high-pressure source (THZ) or a low pressure reservoir (NDS). To enable the control edge gap (44) to be adjusted, the multiple way control valve is designed such that the first end position of the slide (8, 8') in relation to the cylindrical housing body (2) can be adjusted by varying the position of an axial stop element (46) secured to the tappet (16) or the thickness of at least one spacer (78) arranged between the slide (8') and an axial stop (76).

Description

Multi-way control valve

The invention relates to an electromagnetically controllable multi-way control valve for slip-controlled hydraulic motor vehicle brake systems, for fluidly connecting at least one wheel brake to a high-pressure source or to a low-pressure accumulator, comprising

a slide guided in a sleeve-shaped housing body, which has a first control edge and, together with a corresponding control edge on the housing body, a first variable throttle cross section in the hydraulic

Forms pressure medium connection between the high-pressure source and the wheel brake, the slide being biased towards a first end position in which the wheel brake is fluidly connected to the high-pressure source and is fluidly separated from the low-pressure accumulator,

a valve provided between the wheel brake and the low-pressure accumulator, which in normal braking operation is closed and opened to release pressure in the wheel brake,

a plunger extending from an armature of an electromagnetic actuating device and extending through the slide.

Such multi-way control valves are known. It proves to be problematic in terms of production technology to properly implement the distance between the control edge of the slide and the control edge of the housing body in the first end position. Since then, this has been achieved by precise manufacture of the parts, so that in the event that a change in the control edge spacing is desired, the slide or the formation of the opening of the sleeve-shaped housing body must be changed. The present invention is therefore based on the object of improving a multi-way control valve of the type described at the outset in such a way that the control edge spacing can be set in a simple manner.

This object is achieved according to the invention in a multi-way control valve of the type mentioned in that the first end position of the slide relative to the sleeve-shaped housing body by the position of an axial stop element held on the tappet or via the thickness of at least one spacer element which is arranged between the slide and an axial stop.

If, according to the first embodiment of the invention, the plunger is also brought into its first end position, the first end position of the slide, which is prestressed against the stop element, is set via the position of the stop element. According to the second embodiment of the invention, the slide is biased in the direction of the at least one spacer element, so that the end position of the slide can be adjusted via the thickness of one or more spacer elements.

The stop abuts against the spacer element on the side facing away from the slide side, can be either formed by the housing body itself or by a longitudinal opening in the housing body closing the lid, a valve or an additional guide element for the ^'Stossel. According to a preferred embodiment of the invention, the stop against which the spacer element is supported is formed by a radial projection of the tappet, the tappet being pretensioned in such a way that it presses the valve between the wheel brake and the low-pressure accumulator in normal braking operation keeps closed. In normal braking operation, the ram is therefore in its first end position. The valve between the wheel brake and the low-pressure accumulator is preferably a seat valve, and the preloaded plunger is pressed as a valve body against a sealing seat in normal braking operation, as a result of which its first end position is predetermined as a reference point by the position of the sealing seat. Thus, however, the position of the radial projection of the ram is also predetermined, so that only a spacer element with a suitable thickness needs to be selected and used to set the control edge distance.

According to a further inventive concept, the spacer element or the stop element, together with the plunger, acts as an actuator for the slide when the slide is moved from its first end position.

If, according to the first variant of the invention, the stop element sits in a press fit on the plunger and is displaceable with respect to the plunger by an axial force that is greater than the forces occurring during operation of the valve, this advantageously creates the possibility of moving the Stop element on the tappet to adjust or change the control edge distance. The invention further relates to a method for adjusting the control edge distance with the features of claim 10. Accordingly, the slide is inserted into the housing body when the multi-way valve is installed and the distance of the control edges from one another is determined in its end position. The slide is then removed from the housing body and at least one spacer element of the required thickness is inserted between an axial stop and the slide, so that the slide has the desired control edge spacing when it is reinserted into the housing body.

According to another embodiment of the invention, a stop element which is seated on the tappet and is displaceable by an axial force which is greater than the forces which occur during operation of the multi-way valve is displaced such that the desired control edge distance is set. The stop element is then held frictionally on the ram.

In a further embodiment of the invention, the axial stop element is moved relative to the ram by moving the slide. According to a preferred embodiment, this can also be achieved by moving the anchor.

According to a further concept of the invention, which is independent per se, it is proposed that, in order to adjust the stroke of the electromagnetic actuating device, the armature is pushed onto the plunger up to a predetermined position with respect to the housing body and fixed in this position on the plunger, in particular welded or pressed with the plunger.

Further features, details and advantages of the invention result from the appended claims and the drawing and the following description of two advantageous embodiments of the multi-way control valve according to the invention. The drawing shows:

1 shows a longitudinal section of a first embodiment of the multi-way control valve according to the invention with a stop element held on the tappet;

Figure 2 shows a longitudinal section of a second embodiment of the multi-way control valve according to the invention with a spacer element. FIG. 1 shows a multi-way control valve with a sleeve-shaped housing body 2, in the continuous longitudinal opening 4 of which a slide 8 which can be displaced in the longitudinal direction 6 is provided. Radial openings 10, 12 are formed in the housing body 2, spaced apart from one another in the longitudinal direction 6, which open into the longitudinal opening 4 and form a pressure medium connection for a high-pressure source (not shown) (at 10) or a wheel brake (not shown) (at 12). The slide 8 is designed as a hollow slide and has a longitudinal opening 14 through which a plunger 16 of an electromagnetic actuating device, indicated overall by the reference numeral 18, extends. The electromagnetic actuating device 18 comprises a coil 20 which is arranged around a flange-shaped section 22 of the sleeve-shaped housing body 2 with a reduced outside diameter, as well as an armature 24 which can be displaced in the longitudinal direction 6 inside the flange-shaped housing section 22 and a magnetic core which closes the flange-shaped section 22 to the outside 26.

In the fully assembled state of the multi-way control valve, the armature 24 is connected to the plunger 16 so as to be fixed against displacement and is arranged between the magnetic core 26 and the slide 8. A spring 28 is provided between the magnetic core 26 and armature 24 Armature 24 and plunger 16 biased towards the slider 8.

At the end of the opening 4 of the sleeve-shaped housing body 2 facing away from the electromagnetic actuating device 18, a valve 30 is provided which, during normal braking operation, closes the opening 4 against a pressure medium connection 32 for a low-pressure accumulator, not shown. The valve 30 is designed as a seat valve and comprises a circular-shaped sealing seat 34 with a central passage opening 36. During normal braking operation of the multi-way control valve, the electromagnetic actuating device 18 is in the de-energized state and, as a result of the prestressing by the spring 28, armature 24 and plunger 16 become brought their end position shown in Figure 1. In this end position, the plunger 16 is supported with its free end 38 facing away from the electromagnetic actuating device 18 against the sealing seat 34 of the valve 30 and closes the opening 36 ^' . In this state of the multi-way control valve, the pressure medium connection 10 and 12 of the high pressure source and wheel brake are in pressure medium connection via a reduced-diameter outer peripheral section 39 of the slide 8. For this purpose, the slide 8 has a first control edge 40 in the region of the radial opening 12, which delimits the outer peripheral portion 39. When the slide 8 moves, the control edge 40 approaches a corresponding first control edge 42, which delimits the radial opening 12, so that a variable throttle cross section 44 is formed, which is maximum in the normal braking mode shown.

An axial stop element 46 is seated on the plunger 16 in a press fit, the position of which relative to the plunger 16 determines the first end position of the slide 8. Between an end face 48 of the armature 24 and the slide 8, a compression spring 50 is provided, which surrounds a concentric section 52 of the slide 8 projecting towards the armature 24. Under the pretension of the spring 50, the slide 8 is always forced into contact with the axial stop element 46. The slide 8 has on its end face 54 facing away from the armature 24 an enlarged opening area 56 which merges into the longitudinal opening 14 via a step 58. The axial stop element 46 is sleeve-shaped and dimensioned such that it can be inserted into the enlarged area 56 of the slide 8. The stop element 46 has at its end facing away from the anchor a radial projection 60, in particular in the form of an annular collar extending in sections, against which the end face 54 of the slide 8 bears. Due to the large-area contact of the stop element 46 on the tappet outer surface, the stop element 46 is immovable with respect to the tappet 16 in the case of the forces occurring during the operation of the multi-way control valve.

If the normal braking operation shown is to be exited, namely if a control or regulating device of the motor vehicle brake system detects that a wheel is blocking, the electromagnetic actuating device 18 is energized so that the armature 24 together with the plunger 16 are moved in the direction of the magnetic core 26 . Here, the free end 38 of the plunger 16 lifts off from the sealing seat 34, so that the seat valve 30 opens. The control edge 40 of the slide 8 passes over the corresponding control edge 42 of the housing body 2, so that the pressure medium connection between the high pressure source and the wheel brake is blocked. A control edge 62 formed by the end face 54 of the slide 8 subsequently passes over a corresponding control edge 64 of the radial opening 12, as a result of which a variable flow cross section between the wheel brake and the opening 32 to the low-pressure accumulator is opened so that the pressure prevailing in the wheel brake can be reduced. If the pressure is to be held in the brake, the current through the coil 20 of the electromagnetic actuating device 18 is reduced until the control edge 62 and the corresponding control edge 64 again in the opposite direction runs over, the control edges 40 and 42 still remain closed. However, valve 30 remains open until the control process is complete. In a corresponding manner, the pressure in the wheel brake can also be increased again by slightly reducing the current through the coil 20 again.

In the manufacture or assembly of the multi-way control valve according to the invention, there is now a need to achieve or set the control edge distance 40-42 in the desired manner. This is accomplished via the sleeve-shaped stop element 46. During assembly, the stop element 46 is pressed onto the plunger 16, the stop element 46 being displaced from the final desired position in the direction of the armature 24. It follows from this that after inserting the plunger 16, stop element 46, slide 8 and anchor 24, the control edge 40 of the slide overlaps the control edge 42 of the housing body, so that there can be no pressure medium connection between the high-pressure source and the wheel brake, even though the plunger 16 against the sealing seat 34 abuts and is in its first end position. In order to be able to adjust the control edge spacing 40-42, an axial force is exerted on the armature 24 using a suitable pressing device, which forces the armature moved in the longitudinal direction 6 in the direction of the slide 8. Here, the end face 48 of the armature 24 strikes against the end face of the flange-shaped section 52 of the slide 8 and moves the slide 8 in the direction of the valve 30. This force is transmitted via the end face 54 of the slide 8 to the radial projection 60 and the stop element 46 move this too. As soon as the desired control edge distance 40-42 is reached, the force is removed from the armature 24, whereby it is moved again to the left under the action of the spring 50.

To set the stroke of the electromagnetic actuating device 18, the armature 24 is displaced with respect to the push rod 16 in such a way that the end 66 of the armature 24 on the magnetic core side assumes a predetermined position with respect to a housing edge or marking 68. In this position, the armature 24 is welded to the push rod 16 in the region of the end face 66, glued or otherwise secured in position. Since the magnetic core 26 bears against a step 70 of the housing body 2, a precise stroke setting is achieved.

The further embodiment of a multi-way control valve shown in FIG. 2 differs from that above Embodiment described in that a radial projection 72 in the form of a ring collar 74 in sections is provided on the plunger 16. This collar 74 forms an axial stop 76 against which a spacer element 78 in the form of a circular disk surrounding the plunger 16 is placed. The spacer element 78 is provided between the axial stop 76 and an end face 80 of the slide 8 ′ facing the valve. Since the position of the annular collar 54 relative to the housing body 2 is predetermined by the first end position of the plunger 16, the control edge distance 40-42 is set via the thickness of the spacer element 78.

To adjust the control edge distance, the plunger 16 with the collar 74, but without the spacer element 78 and with the slide 8 ′, spring 50 and the slide-on armature 24, are introduced into the housing body 2. The end face 80 of the slide 8 'thus bears against the annular collar 54, and the control edge section 40-42 is therefore too large. The control edge distance is measured. The plunger 16, slide 8 'and armature 24 are then removed from the housing body 2, and a spacer element 78 of suitable thickness is pushed onto the plunger 16 in accordance with the difference between the measured and the control edge spacing to be set. Thereafter, the slide 8 'is pushed on and the assembly in again introduced the housing body 2. To adjust the stroke, the armature 24 is now pushed onto the plunger 16 in its end position in such a way that it is correctly positioned with respect to a housing edge 68. The assembly is again removed from the housing body 2 in order to press the armature 24 with the plunger 16. For this purpose, annular grooves 82 of slight depth are provided on the circumference of the plunger 16. Armature 24 and plunger 16 could also, as was explained in connection with FIG. 1, be welded or glued together.

Claims

PATENT CLAIMS

1. Electromagnetically controllable multi-way control valve for slip-controlled hydraulic motor vehicle brake systems, for fluid connection of at least one wheel brake (wheel) with a high pressure source (THZ) or with a low pressure accumulator (NDS), comprising

a slide (8 ') which is guided in a sleeve-shaped, one-piece housing body (2) and has a first control edge (40) and, together with a corresponding control edge (42) on the housing body (2), a first variable throttle cross-section (44) in the hydraulic pressure medium connection forms between the high pressure source and the wheel brake, the slide (8 ') being biased towards a first end position in which the wheel brake is fluidly connected to the high pressure source and is fluidly separated from the low pressure accumulator,

one between the wheel brake and the

Low-pressure accumulator provided valve (30), which is closed during normal braking and for Depressurization in the wheel brake is opened,

a plunger (16) extending from an armature (24) of an electromagnetic actuating device (18) and extending through the slide (8, 8 '),

characterized in that

the first end position of the slide (8, 8 ') relative to the sleeve-shaped housing body (2) by the position of an axial stop element (46) held on the tappet 16 or by the thickness of at least one

Spacer element (78), which is arranged between the slide (8 ') and an axial stop (76), is adjustable.

2. Multi-way control valve according to claim 1, characterized in that the tappet (16) is biased such that it keeps the valve (30) between the wheel brake and low-pressure accumulator closed in normal braking operation and the stop (76) from a radial projection (72) the plunger (16) is formed.

3. Multi-way control valve according to claim 2, characterized characterized in that the projection (72) is a radial collar (74).

4. Multi-way control valve according to claim 2 or 3, characterized in that the valve (30) between the wheel brake and low pressure accumulator is a seat valve and the preloaded tappet (16) is pressed as a valve body against a sealing seat (34) in normal braking operation.

5. Multi-way control valve according to one of the preceding claims, characterized in that the spacer element (78) is disc-shaped and surrounds the tappet (16).

6. Multi-way control valve according to claim 5, characterized in that the spacer element (78) lies flat against an end face (80) facing the stop (80) of the slide (8 ').

7. Multi-way control valve according to one of the preceding claims, characterized in that the spacer element (78) or the stop element (46) together with the plunger (16) acts as an actuator for the slide (8, 8 ') when the slide (8, 8 ') its first end position is moved.

8. Multi-way control valve according to one of the preceding claims, characterized in that the stop element (46) sits in a press fit on the plunger (16) and is displaceable with respect to the plunger (16) by an axial force which is greater than that when the Valves occurring forces.

9. Multi-way control valve according to one of the preceding claims, characterized in that the armature (24) with the tappet (16) is pressed.

10. A method for adjusting the control edge distance in a multi-way control valve according to the preamble of claim 1 with the following method steps:

Inserting the slide (8 ') and the plunger (16) into the sleeve-shaped housing body (2) so that they reach their first end position;

Determine the distance between the control edges (40 - 42) from each other: Remove the slide (8 ') from the housing body

(2);

Interposing a spacer element (78) of the required thickness between an axial stop (76) and the slide (8 ') and reinserting the slide (8').

11. Method for setting the control edge distance in a multi-way control valve according to the preamble of claim 1 with the following method steps:

Inserting the slide (8) and the plunger (16) into the sleeve-shaped housing body so that they reach their first end position;

Moving an axial stop element (46) for the slide (8) which is displaceable on the tappet (16) while applying an axial force which is greater than the forces which occur during operation of the valve in order to adjust the distance between the control edges (40-42).

12. The method according to claim 11, characterized in that the axial stop element (46) is displaced by displacing the slide (8) relative to the plunger (16) and thereby moving the stop element (46).

13. The method according to claim 12, characterized in that the armature (24) is displaced relative to the plunger (16), so that the armature (24) presses against an end face of the slide (8) which is displaceable with respect to the plunger (16).

14. The method according to at least one of claims 10 to 13, characterized in that for adjusting the stroke of the electromagnetic actuating device (18) of the armature (24) with respect to the plunger (16) taking its first end position up to a predetermined position with respect to the housing body ( 2) is pushed onto the plunger (16) and fixed in this position on the plunger (16).

15. The method according to claim 14, characterized in that the armature (24) with the plunger (16) is pressed.