Damper valve arrangement for a shock absorber of a motor vehicle

Abstract

The invention relates to a damping valve device (54a, b) for a shock absorber (10) of a motor vehicle and to a shock absorber for a motor vehicle. The damping valve device has a coil (52), an axially movable armature (62) which is arranged at least partially inside the coil, a pilot valve (70) having a pilot working chamber (100) and a sliding tappet (102) arranged in the pilot working chamber, which is axially movable by means of the armature (62), a main valve (68) having a main piston (76) which separates a main control chamber (82) and a pilot control chamber (84) from one another, which are in fluid communication with one another by means of a flow passage (86), a connection channel (98) which is arranged between the pilot control chamber and the pilot working chamber and which fluidically connects them to one another. The sliding tappet is mounted inside the pilot working chamber such that it can be rotated about an axis which extends in the radial direction of the damping valve device.

Description

Technical Field

[0001] The present invention relates to a damping valve device for a shock absorber of a motor vehicle, the damping valve device having a main valve and a pilot valve. Background Technology

[0002] A damper with a damping valve assembly is known from DE102020215480A1, wherein the damping valve assembly has a main valve and a pilot valve adjustable via a magnetic coil. Leakage frequently occurs, particularly in the pilot valve, allowing hydraulic fluid to flow from the pilot control chamber into the pilot working chamber. Various different construction schemes for the control edge of the pilot valve are known in the prior art; however, these schemes are very complex to manufacture and assemble, and therefore costly, and cannot achieve reliable sealing. Summary of the Invention

[0003] Therefore, the object of the present invention is to provide a damping valve device for a shock absorber that enables reliable closure of the pilot valve and can be manufactured and assembled at low cost.

[0004] This task is solved according to the invention by a damping valve device having the features described in claim 1, which is an independent device. Advantageous improvements are derived from the dependent claims.

[0005] According to a first aspect, a damping valve device for a shock absorber in a motor vehicle includes: a coil; an armature movable axially, the armature being at least partially disposed inside the coil; a pilot valve having a pilot working chamber and a sliding tap disposed in the pilot working chamber, the sliding tap being movable axially by means of the armature; and a main valve having a main piston that separates a main control chamber and a pilot control chamber from each other, wherein the main control chamber and the pilot control chamber are in fluid communication with each other via a flow passage. Furthermore, the damping valve device includes a connecting channel disposed between the pilot control chamber and the pilot working chamber and in fluid communication with each other. The sliding tap is mounted inside the pilot working chamber such that it is rotatable about an axis extending radially along the damping valve device. Preferably, the axis of rotation extends only along the axial direction of the damping valve device. The sliding tap is preferably mounted in a manner rotatable relative to the armature rod. In particular, the armature rod is mounted inside the damping valve assembly in a manner that allows movement only in the axial direction. The rotatability of the sliding tappet relative to the armature rod enables tolerance compensation between the valve seat and the control edge. This reliably compensates for axial misalignment of the armature rod and prevents leakage.

[0006] The damping valve device is, for example, a pressure relief valve, which is preferably directly or pilot-controlled. The main valve, having a main piston, is preferably configured to close and open the damping valve device, particularly the pressure relief valve. The main piston is preferably axially movable by means of an armature and / or hydraulic pressure present in the pilot control chamber.

[0007] In addition to the main valve, the damping valve device configured as a pilot-controlled pressure relief valve preferably includes: a pilot valve having a pilot working chamber and a sliding pusher disposed in the pilot working chamber, the sliding pusher being axially movable by means of an armature; and a connecting channel disposed between the pilot control chamber and the pilot working chamber and fluidly communicating the pilot control chamber and the pilot working chamber. For example, a valve spring element, particularly a valve gasket assembly having multiple spring washers, is mounted on the main piston. In the closed position of the main valve, the main piston or optionally the valve spring element is fluid-tightly pressed against the main valve seat.

[0008] For example, the pilot valve has a seat on which a sliding tap rests in the closed position of the pilot valve, such that the connection passage is fluid-tightly closed by the sliding tap. The main piston is preferably movable relative to the housing components in the axial direction of the damping valve assembly.

[0009] Damping valve devices are, for example, arranged in shock absorbers used in motor vehicles. The shock absorber is, for example, a monotube or multitube shock absorber, such as a twin-tube shock absorber. The shock absorber includes, for example, an outer tube that forms the outer surface of the shock absorber, particularly the housing. Inside the outer tube, an inner tube, also referred to as the damping cylinder, is arranged coaxially with the outer tube. A balancing chamber is constructed between the outer and inner tubes, which is preferably at least partially filled with hydraulic fluid. For example, the balancing chamber is partially filled with gas.

[0010] A working piston, connected to a piston rod, is preferably arranged inside the inner cylinder such that it can move within the inner cylinder, wherein the inner cylinder is preferably configured as a guide for the working piston. A damping valve device according to the invention is arranged on the working piston, for example. The working piston divides the internal space of the inner cylinder, in particular, into a first working chamber near the piston rod and a second working chamber away from the piston rod.

[0011] The damping valve device is, for example, at least partially arranged outside the outer cylinder of the shock absorber. In this external arrangement of the damping valve device, an intermediate cylinder is optionally arranged coaxially with the inner and outer cylinders inside the balance chamber. The damping valve device is mounted, for example, on the intermediate cylinder. The intermediate cylinder is preferably fluid-tightly mounted on the inner cylinder, wherein an annular space is formed between the intermediate cylinder and the inner cylinder. The intermediate cylinder preferably has a flange region for mounting the damping valve device to the intermediate cylinder, which preferably forms a fluid inlet and / or fluid outlet for the damping valve device. The outer cylinder preferably has an opening aligned with the flange region for receiving the damping valve device, such that the damping valve device is in fluid communication with the balance chamber. For example, the shock absorber has an additional damping valve device, which is also, for example, arranged outside the outer cylinder. Preferably, this additional damping valve device is in fluid communication with the inner cylinder, especially with the working chamber remote from the piston rod, by means of an adapter installed inside the inner cylinder. Each damping valve device is preferably constructed identically.

[0012] The shock absorber preferably has a sealing assembly that fluidly seals the internal space of the outer cylinder on the side near the piston rod. Opposite to the sealing assembly, at the end away from the piston rod, the internal space of the outer cylinder is preferably fluidly sealed by means of a bottom component. A bottom valve is particularly arranged on the bottom component, which is mounted on the end of the inner cylinder away from the piston rod.

[0013] The damping valve device includes a preferably cylindrical damping valve housing having a substantially tubular portion and an upper housing portion mounted on the tubular portion. The upper housing portion has, for example, a connection area with one or more connection contacts for supplying current to the damping valve device. Preferably, the connection contacts for supplying current are connected to a drive unit. The upper housing portion has, for example, a cylindrical cover section to which a hollow cylindrical section, for example, having a smaller diameter, is connected.

[0014] The damping valve device preferably has a drive section configured as an electromagnet, particularly a coil with multiple turns of windings made of conductive metal wire. This coil is preferably arranged inside the housing of the damping valve device and includes, for example, a coil frame on which the coil windings are wound. Preferably, the coil at least partially or completely surrounds an armature space that extends centrally in the axial direction. Preferably, the armature is supported inside the armature space in a manner that allows axial movement. The armature is preferably mounted inside the armature space in a manner that allows axial sliding and includes, for example, a centrally located armature rod, which is, for example, configured as a tube and extending centrally through the armature space in the axial direction. The armature space is preferably defined by a pole shoe tube that is at least partially hollow and cylindrical, which preferably serves as a guide for the armature.

[0015] The damping valve assembly preferably includes a main valve and a pilot valve, and in particular, a valve inlet for supplying hydraulic fluid into the damping valve assembly and a valve outlet for supplying hydraulic fluid out of the damping valve assembly. The pilot valve is preferably located downstream of the main valve. In particular, the damping valve assembly can only be saturated with hydraulic fluid in one direction.

[0016] The main valve preferably includes a main piston arranged axially movable within a main working chamber. The main valve includes a housing component that at least partially defines the main working chamber and forms an axial guide for the main piston. The main piston is preferably arranged such that it separates a main control chamber and a pilot control chamber from each other, wherein the main piston optionally has a flow through which it extends and forms fluid communication between the main control chamber and the pilot control chamber. Optionally, the pilot control chamber is in fluid communication with a first or second working chamber of the damper via the flow through which it is arranged. The housing component is, for example, constructed as a hollow cylinder and includes, for example, a valve inlet or valve outlet. Preferably, the housing component at least partially or completely surrounds the main valve, particularly the main piston, and the main working chamber having the main control chamber and the pilot control chamber, in the axial and / or circumferential directions.

[0017] For example, the main piston is configured such that the end face of the main piston facing the main control chamber (which is subjected to the hydraulic pressure of the main control chamber) is larger than the end face of the main piston facing the pilot control chamber (which is subjected to the hydraulic pressure of the pilot control chamber).

[0018] In the operation of a damping valve device, particularly a pilot-controlled pressure-limiting valve, hydraulic fluid flows into the main control chamber through the valve inlet. The main piston, due to the pressure within the main control chamber, is subjected to an opening force and moves axially in the opening direction. Here, the main piston and optionally the valve spring element are lifted from the main valve seat, and the hydraulic fluid flows through the main flow passage to the valve outlet. Simultaneously, a portion of the hydraulic fluid flows through a flow through-hole in the main piston to the pilot control chamber and applies a closing force to the main piston towards the main valve seat. This closing force determines the opening width of the main valve, particularly the cross-section of the main flow passage, which in turn determines the damping force of the damping valve device.

[0019] In the case of a pilot-controlled pressure relief valve, the closing force is preferably determined by the pressure present in the pilot control chamber. The pressure in the pilot control chamber is regulated, in particular, by a pilot valve, in which hydraulic fluid flows from the pilot control chamber into the pilot working chamber through a connecting channel, and is released by a sliding tappet. The opening width of the connecting channel depends on the axial position of the sliding tappet, which is adjusted by means of a magnetic coil, and in particular, predetermined.

[0020] In an external damping valve assembly located outside the outer cylinder, the valve inlet is particularly constructed in the flange region of the damping valve assembly, wherein this flange region is preferably connected to the outer cylinder, inner cylinder, and / or intermediate cylinder of the damper. The main valve preferably has a main valve seat, which is constructed, for example, in the flange region, and the main piston is fluid-tightly abutted against this main valve seat in the closed position of the main valve. In the open position of the main valve—in which the main piston is axially raised from the main valve seat—a main flow passage is preferably constructed between the main piston and the main valve seat. The main flow passage preferably constitutes fluid communication between the valve inlet, particularly the main control chamber, and the valve outlet.

[0021] A spring element is preferably mounted on the side of the main piston away from the main valve seat. This spring element is arranged such that it applies a spring force to the main piston in the direction of the main valve seat. The spring element is, for example, a preloaded spring having one or at least two sets of spring washers, wherein the sets of spring washers are preferably constructed in a disc shape, and in particular, in a teller spring shape.

[0022] Damping valve devices, especially pilot-controlled pressure relief valves, preferably include a connecting passage for connecting the pilot control chamber to the pilot working chamber of the pilot valve. The connecting passage is preferably constructed in the housing component or in a region fixedly connected to the housing of the damping valve device, and particularly extends centrally in the axial direction. Preferably, the connecting passage forms a fluid inlet to the pilot valve.

[0023] The pilot valve preferably includes a sliding tap, which is axially movable within the pilot working chamber. The sliding tap preferably rests against the armature at its end opposite to the main valve, such that the movement of the armature and the sliding tap is mechanically coupled at least in the springback direction. The pilot valve is preferably movable to a closed position, in which the sliding tap rests against the valve seat of the pilot valve, such that the connection passage is completely closed by the sliding tap, thereby preferably preventing fluid flow into the pilot working chamber through the connection passage. The pilot valve is preferably movable to an open position, in which the sliding tap is lifted from the valve seat of the pilot valve, such that the connection passage is released by the sliding tap and fluid flow is realized between the pilot control chamber and the pilot working chamber of the main valve. For example, the pilot valve has a fluid passage for fluid communication between the pilot working chamber and the valve outlet. The pilot working chamber is preferably in fluid communication with an outlet passage through which hydraulic fluid can flow from the pilot working chamber into the valve outlet, particularly into the first or second working chamber.

[0024] According to the first embodiment, the sliding tap is installed at an angle that allows rotation from 0.1° to 10°, particularly from 1° to 9°, preferably from 2° to 4°, and especially from 3°. Specifically, the sliding tap is not installed in a manner that allows it to rotate completely around a rotation axis, but rather its rotatability is limited to a maximum angle of 10°. This achieves sufficient tolerance compensation, and the sliding tap is supported with both axial and radial clearances.

[0025] According to another embodiment, the sliding tap is mounted in a manner that allows it to move axially and radially relative to the armature rod. This compensates for axial misalignment of the armature rod and prevents misalignment of the sliding tap in the connecting channel.

[0026] According to another embodiment, the sliding tap has a hole in which the armature rod is partially disposed. Preferably, the armature rod is mounted in the hole with its end pointing toward the main valve. The sliding tap has, for example, a U-shaped longitudinal section. The hole is specifically constructed in the face of the sliding tap toward the armature rod. The hole extends, for example, centrally to at least half the axial length of the sliding tap.

[0027] According to another embodiment, a radial clearance is constructed between the armature rod and the sliding tappet. Preferably, the hole has an inner diameter larger than the outer diameter of the area of ​​the armature rod disposed within the hole. For example, the clearance is 0 to 3 mm, preferably 0.01 to 0.3 mm, and especially 0.1 mm. This clearance size provides the advantage of preventing jamming in the event of angular deviation of the guide surfaces between the armature and the tappet, and enabling tolerance compensation through the clearance.

[0028] According to another embodiment, the sliding push rod is guided only by the armature rod. The sliding push rod is preferably arranged completely spaced from the inner wall of the pilot working chamber, and especially from the pilot housing component. Preferably, the sliding push rod is freely arranged inside the pilot working chamber, such that it can move at least partially in all degrees of freedom.

[0029] According to another embodiment, a bypass channel is constructed in the sliding tappet, which constitutes a fluid bypass to the pilot valve. This bypass channel preferably extends centrally and coaxially from a side facing the main valve to the orifice and constitutes a fluid bypass to the pilot valve.

[0030] According to another embodiment, the sliding tappet has a valve contact surface for abutting against a valve seat of the pilot valve, the valve contact surface being configured as an annular axial protrusion. The valve contact surface preferably points towards the valve seat. In the closed position of the pilot valve, the valve contact surface is fluid-tightly abutting against the valve seat. The valve seat is preferably constructed on a stationary central block, which is connected to the housing component of the damping valve assembly. The central block is particularly arranged in the pilot control chamber and supported on or fixedly connected to the housing component, or constructed integrally with or as a single piece of the housing component. A connection channel for connecting the pilot control chamber to the pilot working chamber of the pilot valve is preferably constructed in the central block.

[0031] According to another embodiment, the outer diameter of the valve contact surface is larger than the outer diameter of the armature rod, especially the area of ​​the armature rod arranged in the hole of the sliding tappet. This ensures that the valve contact surface is pressed against the valve seat each time the armature rod is misaligned. For example, the armature rod is constructed to be at least partially or completely hollow cylindrical.

[0032] According to another embodiment, the damping valve device has a pilot spring element that rests against a sliding push rod, such that the pilot spring element applies a force to the sliding push rod in the opening direction of the pilot valve. The pilot spring element is, for example, a spiral spring (Spiralfeder) or a coiled spiral spring (Schraubenfeder), particularly arranged and configured such that it applies a preload force to the sliding push rod in the direction of the armature. Preferably, the preload element, configured as a spiral spring, leaf spring, and / or a coiled spiral spring, is arranged coaxially with the sliding push rod. This pilot spring element improves operational reliability and ensures reliable movement of the sliding push rod in the direction of the armature, thus reaching a fail-safe position in the absence of power.

[0033] According to another embodiment, the sliding tappet has an axial contact surface against which a pilot spring element rests. This contact surface is preferably constructed as an annular radial shoulder.

[0034] The invention also includes a damper having the above-described damping valve device, which is arranged, for example, on the working piston and / or at least partially outside the outer cylinder. Attached Figure Description

[0035] The present invention will now be described in detail with reference to several embodiments and the accompanying drawings.

[0036] Figure 1 A schematic diagram of a vibration damper according to one embodiment is shown in longitudinal sectional view.

[0037] Figure 2 A schematic diagram of a damping valve device according to another embodiment is shown in longitudinal sectional view.

[0038] Figure 3 A partial schematic diagram of a damping valve device according to another embodiment is shown in longitudinal sectional view. Detailed Implementation

[0039] Figure 1 A vibration damper 10 is shown, which is a multi-tube vibration damper, such as a twin-tube vibration damper. The vibration damper 10 has an outer tube 12, which forms the outer surface of the vibration damper 10, especially the housing. An inner tube 14, which can also be referred to as a damping tube, is arranged coaxially with the outer tube 12 inside the outer tube 12. A balancing chamber 16 is constructed between the outer tube 12 and the inner tube 14, which is preferably at least partially filled with hydraulic fluid. For example, the balancing chamber 16 is partially filled with gas.

[0040] A working piston 18, connected to a piston rod 20, is arranged inside the inner cylinder 14, allowing the working piston to move within the inner cylinder 14. The inner cylinder preferably serves as a guide for the working piston 18. The working piston 18 has, for example, a valve device (not shown). The working piston 18 divides the internal space of the inner cylinder 14 into a first working chamber 22 located near the piston rod and a second working chamber 24 located away from the piston rod. Inside the balance chamber 16, an intermediate cylinder 26 is arranged coaxially with the inner cylinder 14 and the outer cylinder 12, between the inner and outer cylinders.

[0041] The internal space of the outer cylinder 12 is fluid-sealed on the side near the piston rod by means of a sealing assembly 34. Opposite to the sealing assembly 34, at the end away from the piston rod, the internal space of the outer cylinder 12 is fluid-sealed by means of a bottom member 36. A bottom valve 38 is arranged on the bottom member 36, for example, and is particularly mounted on the end of the inner cylinder 14 away from the piston rod. The bottom valve 38 is, for example, a check valve that can be circulated in two directions or only in one direction. The second working chamber 24 is preferably in fluid communication with the balance chamber 16 via the bottom valve 38. The ends of the inner cylinder 14 and the outer cylinder 12 near the piston rod are preferably fastened to the sealing assembly 34.

[0042] The intermediate cylinder 26 is preferably fluid-tightly mounted on the inner cylinder 14. An annular space 28 is formed between the intermediate cylinder and the inner cylinder 14. At least one through opening 30 is formed in the inner cylinder 14, which fluidly communicates the first working chamber 22 with the annular space 28.

[0043] The intermediate cylinder 26 has, for example, a flange region 32 for mounting the damping valve device 54a on the intermediate cylinder 26. The flange region 32 constitutes a receiving portion for the damping valve device 54a, and in particular, the flange region 32 constitutes a fluid inlet and / or fluid outlet for the damping valve device 54a. The flange region 32, for example, connects the annular space 28 to the damping valve device 54a. The outer cylinder 12 preferably has an opening aligned with the flange portion 32 for receiving the damping valve device 54a, such that the damping valve device 54a is in fluid communication with the balance chamber 16.

[0044] The damper 10 includes, for example, an additional damping valve device 54b, which is in fluid communication with the inner cylinder 14, particularly with the working chamber 24 remote from the piston rod, via an adapter 40 mounted inside the inner cylinder 14. Preferably, the outer cylinder 12 and the intermediate cylinder 26 have openings aligned with the adapter for receiving the damping valve device 54a. The damping valve devices 54a and 54b are constructed identically, for example. For instance, both damping valve devices 54a and 54b are configured as directly controlled or pilot-controlled pressure relief valves.

[0045] The piston rod 20 may have an optional spring stop, which is subjected to an elastic force via a spring element 42 when moving in the spring direction Z.

[0046] Figure 2 Exemplary damping valve devices 54a and 54b are shown, which are preferably arranged as external valves at least partially outside the outer cylinder 12 of the damper 10. The damping valve devices 54a and 54b are configured, for example, as pilot-controlled pressure-limiting valves and include a preferably cylindrical damping valve housing having... Figure 1 The diagram shows a generally tubular tubular portion 45 and a housing upper portion 44 mounted on the tubular portion 45. The housing upper portion 44 has, for example, a connection region 46 with one or more connection contacts for supplying current to the damping valve devices 54a, b. Preferably, the connection contacts for supplying current are connected to a drive unit. The housing upper portion 44 also has, for example, a cylindrical cover section 56 to which a hollow cylindrical section 58, for example, having a smaller diameter, is connected.

[0047] Damping valve devices 54a, b, for example, have an actuation region 48 and a valve region 50. The actuation region 48 is arranged, for example, in the upper region of the damping valve devices 54a, b facing the upper portion 44 of the housing, and preferably substantially above the valve region 50. The actuation region 48 preferably includes an actuation portion configured as an electromagnet. This electromagnet includes a coil 52 having a multi-turn winding made of conductive metal wire. The coil 52 is preferably arranged concentrically with the tubular portion 45 inside the tubular portion. The coil 52 is arranged, for example, inside the hollow cylindrical section 58 of the upper portion 44 of the housing, and particularly against the inner wall of the upper portion 44 of the housing. The upper portion 44 of the housing is made, for example, of a plastic material, particularly of a non-magnetic material or a material with only very weak magnetic properties, preferably a magnetic isolator or a high magnetic resistance material. The coil 52 includes, for example, a coil frame on which the winding of the coil is wound. The coil 52 at least partially or completely surrounds the armature space 60, which extends centrally in the axial direction. The armature 62 is supported inside the armature space 60 in a manner that allows axial movement. The armature 62 is preferably cylindrical and has a diameter slightly smaller than the diameter of the armature space 60, such that the armature 62 is preferably mounted in a manner that allows sliding in the axial direction. The armature 62 includes, for example, a centrally located armature rod 65, which is, for example, tubular and extends centrally in the axial direction through the armature space 60. The armature space 60 is preferably defined by a pole shoe tube 64, which is at least partially hollow cylindrical. The pole shoe tube 64 is preferably open at the bottom and, in particular, toward the valve region 50. The pole shoe tube 64 is preferably made of a magnetizable or magnetic material and, for example, has a magnetic isolation portion (not shown).

[0048] The coil 52 is preferably constructed and arranged such that it forms a magnetic field with magnetic lines of force when an electric current is applied, which preferably extend substantially axially in the armature space 60. The armature 62 is preferably made of a magnetizable or magnetic material and is movable axially according to the polarity of the magnetic field formed by the coil 52.

[0049] A pole shoe tube element is axially and coaxially connected to the hollow cylindrical region of the pole shoe tube 64. The hollow cylindrical region and the pole shoe tube element together constitute the pole shoe tube 64, which is constructed, particularly in a multi-piece, integral, or single-piece manner. The pole shoe tube 64 has an upper tubular region with a particularly constant inner diameter. This upper tubular region is preferably constructed as a hollow cylinder and extends axially from the upper part 44 of the housing beyond the armature 62. A lower region with an enlarged diameter is axially connected to the upper hollow cylindrical region, wherein the outer surface of the pole shoe tube 64 preferably extends beyond the armature 62. Figure 1The tubular portion 45 is shown and at least partially abuts against it and is fluidly sealed relative to the tubular portion 45 via the sealing element 66. The pole shoe tube 64 at least partially surrounds the valve region 50, which is described in detail in one of the following paragraphs.

[0050] Valve region 50 includes, for example, a main valve 68 and a pilot valve 70, as well as a valve inlet 72 for supplying hydraulic fluid into damping valve devices 54a, b and a valve outlet 74 for supplying hydraulic fluid out of damping valve devices 54a, b. During operation of the damping valves, hydraulic fluid, particularly the pilot flow, preferably flows from the valve inlet 72 into the main valve 68, then into the pilot valve 70, and subsequently to the valve outlet 74. The main valve 68 includes a main piston 76, which is axially movably arranged within a main working chamber 78. The main valve 68 also includes, for example, a housing component 80, which at least partially defines the main working chamber 78 and forms an axial guide for the main piston 76. The main piston 76 is preferably arranged concentrically with the housing component 80 within the housing component. The main piston 76 preferably divides the main working chamber 78 into a main control chamber 82 and a pilot control chamber 84. The main piston 76 particularly has a flow passage 86 that extends through the main piston 76 and forms fluid communication between the main control chamber 82 and the pilot control chamber 84.

[0051] The valve inlet 72 is specifically constructed in the flange region 88 of the damping valve assembly 54a, b, wherein the flange region 88 is preferably connectable to the outer cylinder 12, inner cylinder 14 and / or intermediate cylinder 26 of the damper 10. Exemplarily and optionally, a valve spring element 108, particularly a valve gasket assembly with multiple spring washers, is mounted on the main piston 76. The valve spring element 108 is preferably constructed in an annular disc shape and fastened to a central shoulder of the main piston 76. A main valve seat 90 is constructed on the flange region 88, on which the main piston 76 or the valve spring element 108 fluid-tightly abuts in the closed position of the main valve 68. In the open position of the main valve 68—in which the main piston 76 and optionally the valve spring element 108 move axially away from the main valve seat 90—the main piston 76 or optionally the valve spring element 108 is lifted from the main valve seat 90, thereby creating a main flow passage 92 between the main piston 76 or the valve spring element 108 and the main valve seat 90. Preferably, the valve spring element 108 abuts against the main valve seat and the main piston 76 between the main valve seat 90 and the main valve seat. In particular, the valve spring element 108 has a through-hole for allowing hydraulic fluid to enter the flow passage 86. The main flow passage 92 constitutes fluid communication between the valve inlet 72, particularly the main control chamber 82, and the valve outlet 74.

[0052] The main piston 76 has a particularly centrally located groove on its surface facing the drive region 48, giving the main piston 76 a hollow cylindrical region. The interior of the groove, particularly the hollow cylindrical region, of the main piston 76 preferably at least partially defines the pilot control chamber 84. A spring element 94 is mounted on the side of the main piston 76 opposite to the main valve seat 90, arranged such that it applies a spring force to the main piston 76 in the direction toward the valve seat 90. The spring element 94 is, for example, a preloaded spring with at least one or two spring washers, wherein the spring washers are preferably constructed in a disc shape, particularly a disc spring. The spring element 94 preferably extends over the entire diameter or a portion of the diameter of the pilot control chamber 84, particularly extending to the inner wall of the housing component 80.

[0053] The spring element 94 preferably rests against a central block 96 that is fixedly connected to the housing component 80. The central block 96 is, for example, arranged in the pilot control chamber 84 and supported on or fixedly connected to the housing component 80, or constructed integrally or as a single piece with the housing component. A connecting channel 98 for connecting the pilot control chamber 84 to the pilot working chamber 100 of the pilot valve 70 is preferably provided in the central block 96. The connecting channel 98 preferably extends centrally through the central block 96 in the axial direction. Preferably, the connecting channel 98 constitutes a fluid inlet to the pilot valve 70. The spring element 94 is preferably constructed and arranged such that it has a fluid passage for allowing fluid to enter the connecting channel 98. Preferably, the spring element includes a central opening aligned with the connecting channel 98.

[0054] Pilot valve 70 includes, for example, a sliding pusher 102, which is axially movable within pilot working chamber 100. The sliding pusher 102 preferably rests against armature 62 at its end opposite to the main valve 68, such that the movement of armature 62 and sliding pusher 102 is coupled at least when armature 62 moves toward sliding pusher 102. In the closed position of pilot valve 70, sliding pusher 102 preferably rests against center block 96, such that connection passage 98 is completely closed by sliding pusher 102. In the open position of pilot valve 70, sliding pusher 102 is lifted from center block 96, such that connection passage 98 is released by sliding pusher 102 and fluid flow is realized between pilot control chamber 84 of main valve 68 and pilot working chamber 100. Pilot valve 70 preferably has a pilot housing component 104, which is fixedly arranged and, for example, rests against or is fixedly connected to housing component 80. The pilot working chamber 100 is constructed inside the pilot housing component 104. The sliding push rod 102 has, for example, a U-shaped longitudinal section. The sliding push rod 102 preferably has an axial contact surface 106 pointing toward the connecting channel 98, and a pilot spring element 112 abuts against this axial contact surface. The pilot spring element 112 is, for example, a helical spring, and is specifically constructed and arranged to apply a force toward the drive region 48 to the sliding push rod 102 in the opening direction of the pilot valve 70.

[0055] Figure 2 The pilot valve 70 is shown, for example, in the closed position, wherein the sliding rod 102 completely closes the connection channel. Preferably, the sliding rod 102 rests against the valve seat 118 in this closed position, which is constructed in the central block 96.

[0056] During the operation of damping valve devices 54a and 54b, hydraulic fluid flows into the main control chamber 82 through valve inlet 72, where the main piston 76 is subjected to an opening force by the pressure in the main control chamber 82 and moves axially upward. Here, the main piston 76 and, for example, the valve spring element 108, are lifted from the main valve seat 90, and the hydraulic fluid flows to the valve outlet 74 through the main flow passage 92. Simultaneously, a portion of the hydraulic fluid flows through the flow through-hole 86 in the main piston 76 to the pilot control chamber 84 and applies a closing force to the main piston in the direction of the main valve seat 90. This closing force determines the opening width of the main valve 68, and in particular the cross-section of the main flow passage 92, which determines the damping force of the damping valve devices 54a and 54b. The pressure in the pilot control chamber 84 is regulated by the pilot valve 70, where hydraulic fluid flows from the pilot control chamber 84 into the pilot working chamber 100 through the connecting passage 98, and is released by the sliding pusher 102. The opening width of the connecting passage 98 depends on the axial position of the sliding pusher 102, which is adjusted, and in particular, predetermined, by means of the magnetic coil 52. In the closed position of the pilot valve 70, the sliding pusher 102 preferably completely closes the connecting passage 98, causing the hydraulic pressure in the pilot control chamber 84 to rise to its maximum value, and the main valve 68 to close as the main piston 76 is pressed against the main valve seat 90. In the open position of the pilot valve 70, the connecting passage 98 is at least partially released by the sliding pusher 102, allowing the hydraulic flow entering the flow passage to flow to the valve outlet 74.

[0057] Figure 3 Show Figure 2 This is part of the damping valve devices 54a and 54b, wherein the same elements are provided with the same reference numerals. The sliding push rod 102 has, for example, a hole 120 in which the armature rod 65 is disposed. The hole 120 is constructed in the face of the sliding push rod 102 pointing toward the armature rod 65. The hole 120 extends, for example, centrally to at least half the axial length of the sliding push rod 102. Preferably, the inner diameter of the hole 120 is larger than the outer diameter of the region of the armature rod 65 disposed inside the hole 120. In particular, a radial clearance 122 is constructed between the armature rod 65 and the sliding push rod 102, and especially the hole 120. In particular, the sliding push rod 102 is guided only by the armature rod 65 inside the pilot working chamber 100. The sliding push rod 102 is preferably arranged completely spaced apart from the inner wall of the pilot working chamber 100, especially from the pilot housing component 104. The sliding tappet 102 preferably has a bypass channel 124 that extends centrally and coaxially from the side facing the main valve 68 to the orifice 120 and forms a fluid bypass to the pilot valve 70.

[0058] The sliding push rod 102 preferably has a valve contact surface 126 for abutting against the valve seat 118. The valve contact surface 126 is preferably constructed as an annular axial protrusion pointing towards the valve seat 118. The valve contact surface 126 is also referred to, for example, as a control edge. The armature rod 65 is at least partially or completely hollow cylindrically constructed. Preferably, the outer diameter of the valve contact surface 126 is larger than the outer diameter of the armature rod 65, and particularly the outer diameter of the area of ​​the armature rod 65 arranged in the bore 120 of the sliding push rod 102.

[0059] List of reference numerals

[0060] 10. Vibration dampers

[0061] 12 outer cylinder

[0062] 14 Inner cylinder

[0063] 16 Balance Chambers

[0064] 18 Working piston

[0065] 20 Piston Rod

[0066] 22 First / Working Chamber Near Piston Rod

[0067] 24 Second / Working chamber furthest from the piston rod

[0068] 26 Intermediate Cylinder

[0069] 28. Circular Space

[0070] 30 Through opening

[0071] 32 Flange area

[0072] 34 Enclosed Components

[0073] 36 Bottom Components

[0074] 38 Bottom Valve

[0075] 40 Adapters

[0076] 42 Spring elements

[0077] 44 Upper part of the shell

[0078] 45 Tubular portion

[0079] 46 Connecting Area

[0080] 48 Drive Area

[0081] 50 Valve Area

[0082] 52 coils

[0083] 54a, b Damping valve devices

[0084] 56 cover section

[0085] 58 Hollow cylindrical section

[0086] 60 Armature Space

[0087] 62 Armature

[0088] 64 pole shoe tube

[0089] 65 armature

[0090] 66 Sealing elements

[0091] 68 Main Valve

[0092] 70 Pilot Valve

[0093] 72 Valve Inlet

[0094] 74 Valve Outlet

[0095] 76 Main Piston

[0096] 78 Main working chamber

[0097] 80 Housing components

[0098] 82 Main Control Chamber

[0099] 84 Pilot Control Chamber

[0100] 86. Flowing through section

[0101] 88 Flange area

[0102] 90 Main valve seat

[0103] 92 Main Flow Channel

[0104] 94 Spring Components

[0105] 96 center blocks

[0106] 98 Connection Channel

[0107] 100 Pilot Working Chamber

[0108] 102 Sliding Tape

[0109] 104 Pilot Housing Component

[0110] 106 contact surfaces

[0111] 108 Valve Spring Element

[0112] 112 Pilot Spring Element

[0113] 118 Valve seat

[0114] 120 holes

[0115] 122 Radial clearance

[0116] 124 Bypass Channel

[0117] 126 Valve contact surface

Claims

1. A damping valve device (54a, b) for a shock absorber (10) for a motor vehicle, said damping valve device having: Coil (52) An armature (62) capable of axial movement, the armature being at least partially disposed inside the coil (52). A pilot valve (70) having a pilot working chamber (100) and a sliding tap (102) disposed in the pilot working chamber (100), the sliding tap being axially movable by means of the armature (62), and The main valve (68) has a main piston (76) that separates the main control chamber (82) and the pilot control chamber (84) from each other. The main control chamber (82) and the pilot control chamber (84) are fluidly connected to each other via a flow passage (86). A connecting channel (98) is arranged between the pilot control chamber (84) and the pilot working chamber (100) and fluidly connects the pilot control chamber and the pilot working chamber to each other. Its features are, The sliding tappet (102) is installed inside the pilot working chamber (100) such that the sliding tappet can rotate about an axis extending in the radial direction along the damping valve device (54a, b).

2. The damping valve device (54a, b) according to claim 1, wherein, The sliding push rod (102) is installed at an angle that allows it to rotate about 0° to 10°, preferably 2° to 4°, and especially 3°.

3. The damping valve device (54a, b) according to any one of the preceding claims, wherein, The sliding tappet (102) is mounted in a manner that allows it to move axially and radially relative to the armature rod (65).

4. The damping valve device (54a, b) according to any one of the preceding claims, wherein, The sliding push rod (102) has a hole (120) in which the armature rod (65) is partially arranged.

5. The damping valve device (54a, b) according to any one of the preceding claims, wherein, A radial clearance (122) is provided between the armature rod (65) and the sliding push rod (102).

6. The damping valve device (54a, b) according to any one of the preceding claims, wherein, The sliding tappet (102) is guided only by the armature rod (65).

7. The damping valve device (54a, b) according to any one of the preceding claims, wherein, A bypass passage (124) is constructed in the sliding tappet (102), which constitutes a fluid bypass to the pilot valve (70).

8. The damping valve device (54a, b) according to any one of the preceding claims, wherein, The sliding push rod (102) has a valve contact surface (126) for abutting against the valve seat (118) of the pilot valve (70), and the valve contact surface (126) is configured as an annular axial protrusion.

9. The damping valve device (54a, b) according to claim 8, wherein, The valve contact surface (126) has a larger outer diameter than the armature rod (65).

10. The damping valve device (54a, b) according to any one of the preceding claims, wherein, The damping valve device (54a, b) has a pilot spring element (112) that rests against the sliding push rod (102) such that the pilot spring element applies a force to the sliding push rod (102) in the opening direction of the pilot valve (70).

11. The damping valve device (54a, b) according to claim 10, wherein, The sliding push rod (102) has an axial contact surface (106), and the pilot spring element (112) rests against the axial contact surface.

12. A shock absorber (10) for a motor vehicle, said shock absorber having: The outer cylinder (12) and the inner cylinder (14) arranged coaxially with the outer cylinder, and A working piston (18) is arranged axially inside the inner cylinder (14), which divides the internal space of the inner cylinder (14) into a working chamber (22) near the piston rod and a working chamber (24) away from the piston rod. in, The shock absorber has a damping valve device (54a, b) according to any one of the preceding claims.

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