DE3435950A1 - Multiway valve, especially pressure-controlled inlet valve - Google Patents

Abstract

In a multiway valve, especially a pressure-controlled inlet valve (7), preferably for the control of the pressure medium flowing into the working chamber (36) of the brake pressure transmitter (1) of a motor vehicle brake system with slip control, a longitudinally displaceable piston (61) is arranged in a bore (62) of the valve housing (79), between an inlet chamber (16), connected to the pressure source, for example a hydropneumatic accumulator (13), on the one hand, and an outlet chamber (19), connected to the compensating vessel (9) and the brake pressure transmitter (1), on the other hand, which piston, when acted upon by a pressure, allows the pressure medium to pass from the inlet chamber (16) into the outlet chamber (19), a closing element (67) arranged on the end of the piston (61) shutting off the housing connection (8) to the compensating vessel (9). The piston (61) also has a longitudinal bore (64), which can be closed by a valve body, for example a valve ball (17), held on the piston (61), a radially extending transverse element, for example a ring (65) with lugs being provided, which interacts with a stop (66) fixed to the housing and, on attainment of the opening pressure, on the one hand arrests the valve ball (17) and on the other permits a further movement of the piston (61). <IMAGE>

Description

ALFRED TEVES GMBH. . . P 5658

Multi-way valve, especially pressure-controlled inflow valve

The invention relates to a multi-way valve / in particular a pressure controlled inflow valve with one in the valve housing between an inlet chamber and an outlet chamber arranged, mounted in a bore of the valve housing, movable against the force of a valve spring Piston which, in its one end position, allows the pressure medium to pass from the inlet chamber into the outlet chamber permitted and one end of which has a closure part which, when the piston is pressurized, is one of blocks two housing connections opening into the outlet chamber.

Such valves are used, for example, in brake pressure transducers for hydraulic motor vehicle brake systems Slip control is used, where there is a subsequent flow of pressure medium into the working chambers of the brake pressure transducer enable when one of the assigned vehicle wheels enters the critical slip range during braking device so that the wheel brake of the vehicle wheel concerned must be released. Releasing the wheel brake is thereby caused that a switched on in the brake line valve a return flow of the pressure medium in the overflow container permitted.

In an older actuation device for a hydraulic brake system with slip control (P 33 25 424.9) an inflow valve is used, its

ALFRED TEVES GMBH. P 5658

one-piece sliding valve piston has two sealing seats, one of which is the pressure medium passage from the outlet chamber to the follow-up tank controls and the other cooperates with an annular piston displaceable against spring force and when the Operating pressure the flow of the pressure medium from the inlet chamber to the brake pressure transducer. This older inflow valve has the disadvantage that the for the post-flow of the pressure medium existing flow cross-sections have proven to be too small. In addition, this is done Opening of the valve passage from the outlet chamber to the follow-up tank after the pressure medium has continued to flow has ended in the working chamber of the brake pressure transducer, not quickly and safely enough.

It is an object of the present invention to provide a 3/2-way valve of the type in question which has particularly large flow cross-sections and allows particularly reliable and rapid switching.

According to the invention this is achieved in that the piston has a longitudinal bore, which is held by a valve body held on the piston, preferably a valve ball is closed, wherein a radially extending cross member, for example a ring is provided with the a stop fixed to the housing cooperates and on the one hand the valve ball when the opening pressure is reached

ALFRED TEVES GMBH _; P 5658

holds and on the other hand allows a further movement of the piston in the opening direction and thus the flow of the pressure medium through the longitudinal bore of the piston up to the outlet chamber, with the one Valve spring acted upon closure part on the exhaust chamber side The end of the piston is held and guided displaceably on the piston by a small amount.

At the end of the piston facing the inlet chamber there is preferably a valve seat for the valve ball Shaped collar or pin in the outer surface of which an annular groove is cut into which the Hook-like shaped ends of extending in the longitudinal direction of the piston, overlapping the valve ball Engage arms of a sleeve provided coaxially to the piston, the sleeve opening radially outward having extending splash or collar on which one end of the valve spring is supported, the other end rests against a shoulder of the housing bore.

The end of the piston on the outlet chamber side advantageously has an edge or collar behind which the hook-like grip shaped ends of arms extending in the longitudinal direction of the piston, on which the sealing member for the sealing seat of the housing connection having closure part are formed.

In order to create a connection between the valve housing and the cross member, the with the valve ball cooperating ring several finger-shaped radially outwardly extending lugs on the between the The arms of the sleeve protrude and that after the housing connection has been shut off for the return flow

ALFRED TEVES GMBH. P 5658

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hit the shoulder of the two-step longitudinal bore in the valve housing.

Appropriately, the valve housing with a than Stepped bore formed longitudinal bore provided, the large stage of which forms the inlet chamber and in the smaller one Stage of the piston is mounted longitudinally displaceable, wherein the outlet chamber-side end of the piston is dimensioned so that an annular space forming the outlet chamber remains.

The sleeve tied to the piston has at its end facing away from the piston one of its longitudinal bore from radially inwardly extending collar or flange on which the acting on the valve ball The closing spring is supported, the longitudinal bore of the sleeve of the holder and guidance of the in the closed position on Valve seat of the piston adjacent valve ball is used.

In a preferred embodiment, the cross member or ring is with a central recess or opening provided, whose edge facing the valve ball at least partially on the half of the valve seat facing Spherical surface rests, with between the cross member or ring and the inlet chamber-side end face of the A gap remains in the piston.

The invention allows a wide variety of possible embodiments. One of these is in the attached Drawings shown in more detail. And show:

ALFRED TEVES GMBH. .. '. P 5658

Fig. 1 the valve according to the invention in cooperation with the pressure transducer of a hydraulic brake system with slip control, both the valve and the pressure transducer are shown in longitudinal section and greatly simplified and

FIG. 2 shows the section along the lines A-B according to FIG.

The valve 7 consists of a stepped bore arranged in the small step 62 of a valve housing 79 Piston 61 mounted so as to be longitudinally displaceable, which has a longitudinal bore 64 and its housing connection 8 facing end is connected to a closure part 67 which has a sealing member 14 on its end face. That Closure part 67 is facing away from the sealing member 14 on its The end is provided with a plurality of hook-shaped arms 68,68 'which are positioned behind the collar 69 of the piston 61 grasp, so that the head part 67 against the force of a valve spring 70 relative to the piston 61 by the amount "a" is. The housing connection 10 for the pressure line 11 facing a pin 85 forming the end of the The piston 64 is provided with a groove 71 into which the arms 72, 72 'of a sleeve 73 engage, in the longitudinal bore 74 thereof the valve ball 17 is held and guided, which with the aid of the closing spring 75 is applied to the valve seat 18 on the piston 61 is printed. A ring 65 is located between the arms 72, 72 ' arranged, which rests against the valve ball 17 and together with this by the dimension "b" against the force of the closing spring 75 is displaceable in the longitudinal direction.

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The 3/2-way valve 7 has the task of reducing volume in the connected brake pressure transducer 1 the flow from a pressure generator, for example from a memory to open the working chamber 36, it is essential that the flow cross-sections of the valve 7 in in any case sufficient to allow comparatively large amounts of pressure medium to flow through. Opening the Valve 7 takes place already at a small pressure difference between the chambers 16 and 19, whereby before a residual pressure in the outlet chamber 19 is reduced via the ball seat before the valve 7 leads to the follow-up container 9 opens.

When pressure builds up in the inlet chamber 16 of the valve 7, the piston 61 is pushed against the force of the valve spring 76 to the right (i.e. in the direction of the housing connection 8) until the valve passage 14.15 is closed at 8 and the ring 65 on the Shoulder 66 has put on. If the pressure in the inlet chamber 16 continues to rise, the valve passage opens at 18, only the area D-d of the piston 61 is still effective.

The mode of operation of the valve 7 in cooperation with the pressure transducer shown in FIG. 1 is described below I a hydraulic brake system with slip control described in more detail.

The brake pressure transducer 1 is via a housing connection 2 and a pressure line 3 with a wheel brake 4 of a vehicle wheel to be braked in connection. He disposes

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via a housing connection 5 which is connected to the valve 7 via a pressure line. The valve 7 has its-, on the other hand, a housing connection 8, which has a permanent connection to an unpressurized follow-up container 9, and also a housing connection 10 which is connected to a connecting valve 12 via a pressure line 11 to which a hydropneumatic pressure accumulator 13 is connected is. The sequence valve 12 is designed as a 2/2-way valve and controllable by slip monitoring electronics (not shown). The sequence valve 12 is when critical slip values are reached on the vehicle wheel assigned to the wheel brake 4, so that Pressure medium from the hydropneumatic pressure accumulator 13 reaches the housing connection 10 of the valve 7 via the connecting valve 12 and the pressure line 11.

The valve 7 has a valve passage 14,15, the is open in the unregulated state of the brake system, so that the housing connection 5 of the brake pressure transducer 1 in connection with the pressureless after-flow tank 9 is. When an inlet chamber 16 of the switching valve is pressurized 7 comes the valve passage 14, 15 in a blocking position, so that the connection between the pressureless Follow-up tank 9 and the housing connection 5 of the brake pressure transducer is interrupted. With another When the hydraulic pressure in the inlet chamber of the valve 7 increases, a valve passage 17, 18 is opened, see above that the pressure prevailing in the pressure line 11 via an outlet chamber 19 to the housing connection 5 of the brake pressure transducer 1 reached.

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The brake pressure generator 1 has a housing 20 in which a cylinder bore 21 is arranged. At the bottom 22 of the A piston 23 is supported on the cylinder bore 21 of the brake pressure transducer 1, the one opposite to the cylinder bore 21 has a smaller diameter. In the cylinder bore, a piston 24 is also sealingly guided, which is in a positive connection with an actuating piston 25, the actuating piston 25 alternatively can be acted upon by hydraulic auxiliary pressure or solely by the action of force on a brake pedal 26 is slidable. The piston 24 is provided with a blind hole 27, the diameter of the blind hole 27 corresponds essentially to the outer diameter of the piston 23. Between the pistons 23,24 is a Sealing collar 28 is provided.

The piston 24 of the brake pressure generator 1 is also equipped with a central valve 29, which is already in a small actuation travel of the piston 24 closes, so that a working chamber 30 of the brake pressure transducer via the pressure channels 31,32 and the housing connection 33 is separated from the pressureless after-flow container 9.

The piston 24 has an annular surface 34 with a larger diameter and an annular surface 35 with a smaller diameter, the housing ring spaces 36,37 delimited by the annular surfaces 34,35 via an im Housing 20 arranged pressure line 38 are connected. In the pressure line 38 between the annular spaces 36,37 is a Throttle 39 arranged. The pressure line 38 leads to a

ALFRED TEVES GMBH "P 5658

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Housing connection 40 which, via a tilt valve 41, connects to the housing ring space 37 of the brake pressure transducer 1 Has. The tilt valve 41 consists essentially of a closing body 42, which is normally operated by a compression spring 43 is held in a position in which the pressure line 38 is shut off from the annular space 37. Further the tilt valve 41 has a valve tappet 44 which, when force is applied, moves in the direction of actuation of the brake pressure transducer the tilt valve 41 opens. To actuate the tilt valve 41 or the valve tappet 44 is on the in the Representation of the right end of the piston 24 a ramp 45 is provided, which after a certain actuation path of the Piston 24 comes to rest on the end of valve tappet 44 and tilt valve 41 is thus in an open position brings,

A shut-off valve 46, which has a housing 47, is connected to the annular space 37 of the brake pressure transducer 1 which a stepped bore 48 is arranged. The stepped bore 48 has a section 49 with a larger one Diameter and over a section 50 with a smaller diameter, between the sections 49.50 a Valve seat 51 is formed, which has a valve passage with a closing body 53 formed on a valve piston 52 forms. At the lower end of the closing body 53 in the illustration, an extension 54 is formed, the one Piston section 55 leads sealed in the bore section 50 with a smaller diameter. The piston portion 55 is loaded by a compression spring 56 and delimits a housing space 57, which is connected to the pressureless after-flow container connected is. By means of the compression spring 56, the valve

ALFRED TEVES GMBH P 5658

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piston 52 in the opening direction of the valve passage 51,53 spring-loaded and biased against a housing stop 58. The upper end face of the Valve piston 52 delimits an inlet space 59, which over a pressure line 60 has a hydraulic connection with the pressure line 11.

The mode of operation of the brake system described is explained in more detail below, initially from the brake release state it is assumed that all moving parts assume the position shown in the illustration. When a force is applied to the brake pedal 26, the piston 24 is moved relative to the piston 23 in the actuating direction moved, the central valve 29 in the piston 24 is closed after a short actuation path, so that the Working chamber 30 of the brake pressure transducer 1 from the pressureless Follow-up tank 9 is separated. When the force on the brake pedal is increased, the piston 24 now moves while reducing the working chamber 30 of the brake pressure transducer relative to the piston 23, whereby in the working chamber 30 a hydraulic pressure arises, which is fed to the wheel brake 4 via the pressure line 3 and the solenoid valve 84 will. When the brake is released, the movements described are reversed until the one from the Representation of the apparent position of the moving parts is taken.

If a hydraulic pressure is generated when the brake is actuated in the working chamber 30 of the brake pressure transducer 1, the leads to the vehicle wheel assigned to the vehicle brake 4 reaching a critical slip range, see above this is caused by the slip over-

ALFRED TEVES GMBH P 5658

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wachungselektronik registered, whereby a corresponding Control signal is output to the sequence valve 12 or to the valves 83, 84. When the sequence valve 12 becomes a hydraulic connection between the hydropneumatic Pressure accumulator 13 and the pressure line 11 produced, whereby initially the shut-off valve through Pressurization of the inlet chamber 59 reaches a position in which the valve passage 51, 53 is closed. The pressure of the hydraulic accumulator 11, which now prevails in the pressure line 11, reaches the housing connection 10 of the valve 7 to the inlet chamber 16 and acts on the piston 61 located in the valve 7 with a valve ball 17, which then moves to the right (in the illustration) and closes the valve passage 14, 15, so that the annular space 36 is separated from the pressureless after-flow container 9. If the valve piston is moved further 61, the valve passage 17, 18 is opened because the cross member or the support ring resting on the valve ball 17 65 abuts against the shoulder 66 of the housing of the valve 7 and holds the valve ball 17 so that the in the pressure prevailing in the inlet chamber 16 via the outlet chamber 19 and the pressure line 6 to the working chamber 36 propagates.

In the following consideration it is initially assumed that when switching over the connecting valve 12 or in the presence of critical slip values, the one enclosed in the working chamber 30 of the brake pressure transducer 1 Volume is greater than the necessary volume reserve of the brake pressure transducer 1. In this case, the tilt valve remains 41 so when the control starts in the closed position. A resetting of the piston 24 can thereby

ALFRED TEVES GMBH P 5658

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do not take place, since the annular space 37 of the pressure transducer 1 is a forms a closed hydraulic system from which no hydraulic fluid can escape.

Should already be when the scheme or
Switching of the connecting valve 42 of the piston 24 has been moved in the actuating direction so far that the tilt valve 41 is opened via the ramp 45 of the piston 24, then when the circumferential annular space 36 is pressurized via the pressure line 38 with the switched on
Throttle 39 resets the piston 24 until the tilt valve 41 again reaches a closed position in which the annular space 37 is hydraulically shut off. When the piston 24 reaches this axial position, in which a predeterminable volume reserve is enclosed in the working chamber of the brake pressure transducer, the movement of the piston 24 in the opposite direction to the actuating force is interrupted so that the relative position between the pistons 23, 24 remains unchanged.

Afterwards by a suitable pressure modulation in the wheel brake 4 by opening or closing the solenoid valves
83,84 an impending blocking condition has been averted, the sequence valve 12 is switched back to its rest position shown in the illustration, in which the
Pressure line 11 from the hydropneumatic pressure accumulator 13
is separated.

When the brake is released, those described are reversed
Moving operations around until that is out of the representation
visible rest position of the moving parts
is made.

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List of the individual parts

1. Brake pressure transducer 2. Housing connection 3. Pressure line 4th Wheel brake 5. Housing connection 6th Pressure line 7th Valve, inlet valve 8th. Housing connection 9. Follow-up container 10. Housing connection 11. Pressure line 12th Sequence valve 13th hydropneumatic accumulator 14th Sealing member 15th Sealing seat 16. Inlet chamber 17, Valve ball 18th Valve seat 19th Outlet canister 20th casing 21. Cylinder bore 22nd floor 23 Pistons 24. Pistons

25. Actuating piston

26. Brake pedal

27. Blind hole

28. Sealing sleeve

29. Central valve

30. Chamber of Labor

31. Pressure channel

32nd pressure channel

33. Housing connection

34. Ring surface

35. Ring surface

36. Housing ringrauia

37. Housing ring space

38. Pressure line

39. Thrush

40. Housing connection

41. Tilt valve

42. Closing body

43. Compression spring

44. Valve tappets

45. ramp

46. Shut-off valve

47. Housing

48. Stepped bore

49. Section of the stepped bore

50th section of the stepped bore

51. valve seat

ALFRED TEVICS GMBH

P 5658

343595Q

52. Valve piston 53. Closing body 54. Port set 55. Piston section 56. Compression spring 57. Housing space 58. Housing stop 59. Inlet space 60 Pressure line 61. Pistons 62. Small step 63. Great level 64. Longitudinal bore 65. ring 66 shoulder 67. Head part, locking part 68. poor

69. Collar

70. Valve fields

71. groove

72nd arm

73. sleeve

74. Longitudinal drilling

75. Closing spring 7.6. Valve spring

77. Return line

78. Connection

79. valve body

80th collar

81. nose

82nd Confederation

83. Solenoid valve

84. Solenoid valve

85th collar, tenon

Claims (6)

ALFRED TEVEvS GMBH September 13, 1984 Frankfurt am Main ZL / Tu / be P 5658 / 1388P H. von Hayn - 3 N. Ocvirk - 1 Claims Multi-way valve, in particular a pressure-controlled inflow valve (7) with one in the valve housing (79) between an inlet chamber (16) and an outlet chamber (19), mounted in a bore (62) of the valve housing (79), against the force of a valve spring (76) movable piston (61) which in its one end position allows the passage of the pressure medium from the inlet chamber (19) into the outlet chamber (19) and one end of which has a closure part (67) which, when the piston (61) is pressurized, enters the outlet chamber (19) closes the opening housing connection (8), characterized in that the piston (61) has a longitudinal bore (64) which can be closed by a valve body, preferably a valve ball (17), held on the piston (61), with a radially extending cross member, for example a ring (65) with lugs (81,8I ¹ ) is provided, which cooperates with a housing-fixed stop (66) and on the one hand when the opening pressure is reached holds the valve ball (17) and, on the other hand, enables further movement of the piston (61) in the opening direction, thus allowing the pressure medium to flow through the longitudinal bore (64) of the piston (61) into the outlet chamber (19), this being done by a valve spring (70) acted upon closure part (67) is held and guided on the outlet chamber side end of the piston (61) by a small amount (a) displaceable on the piston (61). ALFRED TEVES GMBH -: P 5658 2. Multi-way valve according to claim 1, characterized in that on the piston (61) its end facing the inlet chamber (16) has a valve seat (18) for the valve ball (17) Collar or pin is formed, in the outer surface of which an annular groove (71) is cut, into which the hook-like ends of extending in the longitudinal direction of the piston (61), the Valve ball (17) cross arms (72,72 ', 72 ") a sleeve (73) provided coaxially to the piston (61) at its inlet-side end, wherein the sleeve (73) has a radially outwardly extending flange or collar (80) one end of the valve spring (76) is supported, the other end on a shoulder (66) of the Housing bore (62). 3. Multi-way valve according to claim 1 and 2, characterized in that the outlet chamber side The end of the piston (61) has an edge or collar (69) behind which the hook-shaped Ends of in the longitudinal direction of the piston (61) extending arms (68,68 ', 68 ") grip on the the sealing member (14) for the sealing seat (15) of the housing connection (8) having the closure part (67) are trained. 4. Multi-way valve according to claim 1, characterized in that the one with the valve ball (17) interacting ring (65) or cross member several finger-shaped radially outwards ALFRED TEVES GMBH. ^: .. P 5658 - 3 - has to be extended noses (81,81 ', 81 "), the between the arms (72,72 ", 72") of the sleeve (73) protrude and after shutting off one housing connection (8) of the outlet chamber (19) on the Hit the shoulder (66) of the longitudinal hole in the valve housing (79). 5. Multi-way valve according to one or more of the preceding Claims, characterized in that the valve housing (79) as a Has stepped bore formed longitudinal bore, the large step (63) forms the inlet chamber (16) and in the smaller step (62) of which the piston (61) is mounted so as to be longitudinally displaceable, the outlet chamber-side The end of the piston (61) is dimensioned so that it corresponds to the small step (62) of the longitudinal bore of the valve housing (79) forms an annular space. 6. Multi-way valve according to one or more of the preceding Claims, characterized in that the tied to the piston (61) The sleeve (73) at its end facing away from the piston (61) tapers radially inward extending collar (82) on which the closing spring (75) acting on the valve ball (17) supported, the longitudinal bore (74) of the sleeve (73) of the holder and guidance of the in the closed position the valve ball (17) resting on the valve seat (18) of the piston (61) is used. ALFRED TEVES GMBH "P 5658 Multi-way valve according to one or more of the preceding Claims, characterized in that the cross member or ring (65) has a central recess or opening whose edge facing the valve ball (17) at least partially rests against the half of the spherical jacket surface facing the valve seat (18), with between the cross member or ring (65) and the inlet chamber-side end face of the piston (61) a gap remains.