Proportional valve and shock absorber having such a proportional valve
By setting control holes with different diameters and axial offsets and pressure sensing pins in the proportional valve, the shortcomings of existing proportional valve control behavior and manufacturing process are solved, achieving better control effect and reduced cost, thus meeting the application requirements of shock absorbers.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SOLERO TECHNOLOGIES VILLINGEN GMBH
- Filing Date
- 2024-06-27
- Publication Date
- 2026-06-26
AI Technical Summary
There is room for improvement in the control behavior and manufacturing process of existing proportional valves, especially in achieving better control effects and incurring high costs.
Design a proportional valve that, by setting at least two control holes with different diameters and/or axial offsets on the valve body, combined with a pressure sensing pin and a return spring, enables controllable movement of the valve core, thereby adjusting the flow characteristic curve to meet the requirements of the shock absorber.
This achieves better control over behavior and reduces manufacturing costs, adapts hydraulic characteristic curves to different application requirements, and improves the performance of the shock absorber.
Smart Images
Figure CN122295533A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a proportional valve having the features of claim 1 and a shock absorber having such a proportional valve having the features of claim 15. Background Technology
[0002] Proportional valves with different designs are known from the prior art. General-purpose proportional valves are also commonly referred to as regulating valves or piston spool valves and are used, for example, to regulate the flow rate of a medium. Proportional valves are widely used in electrically adjustable shock absorbers, where they regulate the flow rate of hydraulic medium in the shock absorber's bypass. In this type of proportional valve, the proportional characteristic is determined by the proper matching and sizing of the valve spool and valve body. The valve body has one or more radial control holes that fluidly connect at least one inlet to at least one outlet. The valve spool can be axially displaced on the valve body against the force of a return spring by an electromagnetic actuation device configured as a proportional magnet, wherein the control holes can be opened and closed on the outlet side. A valve that is always open when the actuation device is not energized or not actuated is called a NO (normally open) valve, and a valve that is always closed when the actuation device is not energized or not actuated is called an NC (normally closed) valve.
[0003] Such proportional valves are known, for example, from DE102008015416A1, wherein the control orifice is configured in a heart shape in order to achieve a flow rate variation that is as linear as possible relative to the current applied to the actuator.
[0004] This type of proportional valve has proven effective in the past, but it has been shown that there is room for improvement in both its control behavior and manufacturing process. Summary of the Invention
[0005] Therefore, the object of this invention is to provide an improved proportional valve in a manner that achieves the desired effect, eliminating the disadvantages known in the prior art. In particular, the improved proportional valve to be proposed should have better control behavior and be inexpensive to manufacture.
[0006] The above objective is achieved by a proportional valve having the features of claim 1 and a shock absorber having the features of claim 15.
[0007] Further advantageous designs of the invention are specified in the dependent claims.
[0008] The proportional valve according to claim 1 has a valve housing having at least one inlet and at least one outlet. The valve housing also includes a valve body disposed between the at least one inlet and at least one outlet and having at least two control holes that fluidly connect the at least one inlet and at least one outlet, and these control holes open to one of the outer surfaces of the valve body. The proportional valve also includes a valve spool and an electromagnetic actuation device. The valve spool is displaceably supported on the valve body along a longitudinal axis, wherein the electromagnetic actuation device can move the valve spool along the longitudinal axis against the force of a return spring between a closed position closing at least two control holes and an open position at least partially opening at least two control holes. According to the invention, it is specified herein that the at least two control holes have different cross-sections or diameters, and / or the at least two control holes open to the outer surface of the valve body axially offset along the longitudinal axis, i.e., axially offset.
[0009] The concept upon which this invention is based is to adjust the defined variation curve of the release cross section over the valve core stroke by means of at least two control holes with different diameters and / or different axial positions, between at least one inlet and at least one outlet.
[0010] According to one embodiment, at least two control holes may have different cross-sections and be arranged offset along the longitudinal axis.
[0011] According to another embodiment, at least two control holes may preferably have the same cross-section and be arranged offset along the longitudinal axis.
[0012] According to another preferred embodiment, at least two control holes may have different cross-sections and have the same axial position.
[0013] At least two control holes can be easily and inexpensively incorporated into the valve body and have a circular cross-section. By determining and / or positioning the corresponding dimensions of the at least two control holes, a defined variation curve of the opening cross-section over the valve spool stroke can be achieved. Therefore, a defined hydraulic characteristic curve adapted to the application requirements of the shock absorber can be generated.
[0014] In this regard, it should be noted that the position of one of the at least two control holes is always understood as the intersection of the central axis or line of symmetry of the corresponding control hole and the outer surface of the valve body. Axial position describes the location of one of the at least two control holes perpendicular to the longitudinal axis in a plane.
[0015] Furthermore, it has proven advantageous to have at least two control holes distributed around the longitudinal axis, preferably symmetrically distributed. Preferably, more than two control holes are provided, preferably four, six, eight, or more than eight. The control holes can preferably be arranged in pairs on opposite sides of the valve body. On the one hand, this design achieves force balance of the pressure acting on the valve core; on the other hand, it simplifies the manufacturing of the valve body because the two control holes can be manufactured in a common manufacturing step.
[0016] Furthermore, it is advantageous that each of at least two control holes is arranged with such an axial offset that each control hole is opened first, preferably fully opened. Thus, the flow cross-section can be adapted over the valve spool stroke to meet the requirements of the damper.
[0017] A preferred embodiment of the invention specifies that at least two control holes are radially oriented relative to the longitudinal axis. More particularly, it is preferred that the intermediate axis or line of symmetry of the respective control holes intersects the longitudinal axis perpendicularly.
[0018] Furthermore, it has proven advantageous to arrange a pressure-sensing pin displaceable along a longitudinal axis on the valve body, the pressure-sensing pin having a first end and a second end on opposite sides along the longitudinal axis. Pressure acting on at least one inlet can act on the first end, and the second end can effectively contact the valve spool. The pressure-sensing pin is configured to transmit the pressure corresponding to the pressure at at least one inlet to the valve spool along the longitudinal axis. The pressure-sensing pin can preferably displace the valve spool against the force of the actuation device. This allows for mechanical actuation of the proportional valve when high pressure is applied to at least one inlet.
[0019] For example, a pressure sensing pin can cause the valve core to displace in the direction of the open position against the force of the actuator.
[0020] By appropriately selecting the effective hydraulic diameter of the pressure sensing pin, the force of the pressure sensing pin can be adapted in a simple manner. Therefore, the pressure sensing pin can be implemented with different diameters depending on the application of the proposed proportional valve, and thus different amounts of pressure can be applied to the valve core.
[0021] An improvement of the invention specifies that the pressure sensing pin has a stop. The stop is preferably configured such that it abuts against the valve body in an end position between the valve core and the valve body. The stop may be configured as a head and may have an increased diameter. On the one hand, the stop defines the end position of the pressure sensing pin; on the other hand, the stop serves as an anti-loss device for the pressure sensing pin.
[0022] Furthermore, an advantageous improvement specifies that, at the end position of the valve core, by bringing the control edge of the valve core against the valve body, the pressure sensing pin can move axially along the longitudinal axis, or in other words, have an axial "gap".
[0023] Furthermore, it has proven advantageous that the pressure sensing pin can move freely between an end position and a contact position on the valve core in a pressureless state at at least one inlet and at least one outlet, in an open position or a closed position. According to this preferred improvement, the pressure sensing pin can be arranged freely in an axially perforated hole in the valve body. Therefore, the pressure sensing pin does not require its own return spring, but is displaced indirectly via the valve core by the applied pressure and through the return spring.
[0024] According to a preferred embodiment of the invention, a return spring biases the valve spool against the actuating device. More particularly, it is preferred that the return spring biases the valve spool in the open position. In this design, the proportional valve is configured as a so-called NO valve, meaning that the proportional valve is open when the actuating device is without current. Alternatively, the return spring can bias the valve spool in the closed position. In this design, the proportional valve is configured as an NC valve, meaning that the proportional valve is closed when the actuating device is without current.
[0025] Furthermore, it has proven advantageous that the actuating device includes a tappet, and that the tappet is releasably coupled to the valve spool. The tappet can preferably be constructed as a single piece with the armature of the actuating device, thereby producing a proportional valve that is particularly easy to manufacture and install.
[0026] According to a preferred embodiment of the invention, at least two control holes extend along the longitudinal axis to the inner surface of the valve body within the control hole section. Preferably, the flowable cross-section of the valve body tapers along the longitudinal axis within the control hole section. This measure improves the characteristics of the proposed proportional valve, thereby generating a defined hydraulic characteristic curve that adapts to the needs of the entire system, based on the defined variation curve of the opening cross-section over the valve spool stroke. In particular, the flow conditions between at least one inlet and at least two control holes can be improved by taper the valve body along the longitudinal axis.
[0027] Furthermore, it has proven advantageous that the flowable cross-section of the valve body tapers through a dome, cylinder, cone, or truncated cone projecting from the valve body along its longitudinal axis. The dome, cylinder, cone, or truncated cone may project along the longitudinal axis from the bottom of the valve body toward at least one inlet, wherein the dome, cylinder, cone, or truncated cone project into the control hole section. It should be noted in this context that the dome, cylinder, cone, or truncated cone preferably projects only partially into the control hole section. Preferably, the dome, cylinder, cone, or truncated cone project into the control hole section by at least 10%, preferably about 25%.
[0028] Furthermore, the dome, cylinder, cone, or truncated cone protruding along the longitudinal axis extends the guide portion of the pressure sensing pin, and as the length of the guide portion increases, leakage between the pressure sensing pin and the valve body can be reduced. At the same time, the dome, cylinder, cone, or truncated cone can achieve a compact design while improving performance.
[0029] According to a preferred embodiment of the present invention, the dome, cylinder, cone, or truncated cone are arranged coaxially with the longitudinal axis on the valve body. The dome, cylinder, cone, or truncated cone can be an integral part of the valve body.
[0030] Furthermore, it has been proven advantageous that the dome, cylinder, cone, or truncated cone has an end face, and the aforementioned pressure sensing pin penetrates the end face, preferably centrally.
[0031] An improvement of the invention specifies that the valve core has a tapered or wedge-shaped control edge. In particular, it is advantageous that the control edge is axially oriented, thereby minimizing hydraulic flow forces.
[0032] Furthermore, according to a preferred improvement of the invention, at least one pressure balancing hole may be provided on the valve core, which fluidly connects at least one outlet to a cavity surrounding the valve core and valve body. The medium in the cavity surrounding the valve core and valve body can flow out or back through the pressure balancing hole when the cavity changes, for example, during valve stroke or pressure sensing pin stroke.
[0033] Furthermore, it has proven advantageous that the actuator has a pressure balancing orifice through which at least one outlet is connected to a pressure balancing chamber on the armature side of the actuator. By connecting at least one outlet to the pressure balancing chamber in this way, the force required by the actuator can be reduced, and the dynamic behavior of the proposed proportional valve can be improved.
[0034] Another aspect of the invention relates to a shock absorber having the aforementioned proportional valve. Attached Figure Description
[0035] Hereinafter, a preferred embodiment of the proportional valve will be described in detail with reference to the accompanying drawings. In the drawings:
[0036] Figure 1 A cross-sectional view of the proposed proportional valve is shown, which has a valve body and a valve spool movable along a stroke path on the valve body, the valve spool being movable between an open position and a closed position by an actuation device; and
[0037] Figure 2 The enlarged diagram shows the data based on... Figure 1 A partial sectional view of a proportional valve. Detailed Implementation
[0038] In the following detailed description of the accompanying drawings, identical or functionally identical parts or features are identified by the same reference numerals. Furthermore, not all identical or functionally identical parts or features are shown with reference numerals in the drawings.
[0039] Figure 1 A first exemplary embodiment of a proportional valve 1 for a medium, preferably a hydraulic medium, is shown. The proportional valve 1 can be used, for example, in a shock absorber (not shown), particularly in a shock absorber of a motor vehicle (not shown), to adjust the damping characteristics of the shock absorber.
[0040] The proportional valve 1 includes a valve body 10, a valve core 30, and an electromagnetic actuator 50. The valve body 10 has an inlet I and an outlet E.
[0041] The electromagnetic actuation device 50 includes a return spring 55, an excitation coil 51, and an armature 54, and is configured to displace the valve core 30, for example, by means of a push rod 52, along the longitudinal axis L. The valve core 30 and the push rod 52 are preferably not fixedly connected to each other, but rather loosely abut against each other.
[0042] The valve housing 10 includes a valve body 11 fluidly disposed between at least one inlet I and at least one outlet E. The outlet E may be formed by at least one outflow opening 14 in the valve housing 10.
[0043] Furthermore, the valve housing 10 may have an electrode 53 and a magnetic flange 56, wherein the electrode 53 may completely surround the armature 54 on the side opposite to the valve core 30. Figure 1 The diode 53 has a non-magnetic intermediate section that divides the diode 53 into two sub-segments.
[0044] According to an improved embodiment (not shown), the electrode 53 can also be constructed as a single piece from a soft magnetic material without non-magnetic intermediates, and in this case, it has a narrow magnetic passage. Furthermore, the electrode 53 and the magnetic flange 56 can also be constructed as a single piece.
[0045] The valve body 11 can be described as being substantially cup-shaped and rotationally symmetrical, having a first side and a second side opposite to it along the longitudinal axis L. The first side faces the actuating device 50 and the second side has an open end that can form an inlet I.
[0046] The valve body 11 can be press-fitted into the electrode 53 or welded into the electrode 53. The valve body 11 can also be a single piece with a subsection of the electrode 53.
[0047] The valve body 11 includes a valve body bottom 20 and a wall 21 protruding from the valve body bottom 20. The valve body bottom 20 is disposed on a first side of the valve body 11. The valve body 11, or more precisely the wall 21, includes an inner surface 12 and an outer surface 13. The inner surface 12 and the outer surface 13 are preferably cylindrical side surfaces.
[0048] The valve body 11 also includes at least two control holes 15 with circular cross-sections, which fluidly connect the inlet I and the outlet E. The corresponding control holes 15 connect the inner surface 12 and the outer surface 13, or in other words, the corresponding control holes 15 open to the inner surface 12 on one side and to the outer surface 13 on the other side.
[0049] For the purposes of illustration, the control holes 15 are indicated in the drawings by reference numerals 15a, 15b and 15c and are configured as radial holes, the central axis of which preferably intersects perpendicularly to the longitudinal axis L.
[0050] The control holes 15a, 15b, and 15c are arranged axially offset along the longitudinal axis L and / or have different diameters.
[0051] In the embodiment shown in the accompanying drawings, six control holes 15 are provided, wherein two control holes 15a, two control holes 15b, and two control holes 15c are arranged on opposite sides in the diametrical direction of the longitudinal axis L. The control holes 15a, 15b, and 15c are arranged axially offset along the longitudinal axis L and have different diameters.
[0052] The control holes 15 are preferably symmetrically distributed around the longitudinal axis L and extend along the longitudinal axis L to the inner surface 12 of the valve body 11 in the control hole section 16.
[0053] In the exemplary embodiment shown, a plurality of outflow openings 14 are arranged in the valve housing 10. The positions of the respective outflow openings 14 preferably correspond circumferentially and / or in size to the positions and / or in size of the associated control orifice 15.
[0054] In the control orifice section 16, the cross-section through which the valve body 11 can flow gradually tapers from the inlet, thereby improving the flow conditions on the inlet side of the control orifice 15. The taper of the flowable cross-section can be achieved by a truncated cone 18 or a cylinder that freely protrudes from the bottom 20 of the valve body along the second side of the valve body 11 and at least partially protrudes into the control orifice section 16.
[0055] The valve core 30 can be described as cup-shaped and rotationally symmetrical, and having a sleeve-shaped collar 32 that protrudes from the valve core bottom 31 along the longitudinal axis L. The valve core 31 has a first side and a second side opposite along the longitudinal axis L, the second side having a free end. The first side faces the actuation device 50 and includes the valve core bottom 31, which is in effective contact with the actuation device 50.
[0056] At the free end, a preferred axial control edge 33 is formed on the collar 32. The collar 32 of the valve core 30 may taper in a wedge shape toward the free end, thereby forming a sharp or strongly tapered control edge 33.
[0057] The valve core 30 is movably supported on the valve body 11 along the longitudinal axis L in the valve housing 10 and is thus pushed or fitted onto the valve body 11. The valve core 30 engages above the valve body 11, and the inner surface of the valve core 30, more precisely the inner surface of the collar 32, and the outer surface 13 of the valve body 11, more precisely the outer surface 13 of the wall 21, work together for support and preferably work together in a sealing manner.
[0058] The valve core 30 can move along the longitudinal axis L between a closed position (not shown) that closes at least two control holes 15 and an open position that at least partially releases at least two control holes 15 by a so-called valve core stroke.
[0059] In the closed position (not shown), the valve core 30 is sealed against the outer surface 13 through at least two control holes 50. Thus, the medium cannot flow from the inlet I to the outlet E through the at least two control holes 15.
[0060] In the open position according to the attached drawings, at least two control holes 15 are at least partially released, thereby allowing the medium to flow from the inlet I through the at least two control holes 15 to the outlet E.
[0061] A cavity 37, having a receptacle, is surrounded by the valve core 30 and valve body 11. The receptacle within the cavity between the valve core 30 and valve body 11 depends on the valve core stroke. The cavity 37 can be vented or vented through at least one pressure balancing opening 34. The pressure balancing opening 34 fluidly connects the surrounded cavity to the outlet E.
[0062] According to the illustrated embodiment, the return spring 55 can be arranged in the cavity 37 between the valve core 30 and the valve body 11.
[0063] The return spring 55 can be configured as a helical compression spring and can be positioned on the valve core 30 and the valve body 11 by means of the spring spindle.
[0064] In the illustrated embodiment, the valve core 30 is held in the open position when the actuating device 50 is not actuated or energized. The proportional valve 1, which is held in the open position when the actuating device 50 is not actuated by the return spring 55, is called a NO (normally open) valve.
[0065] In this embodiment, the proportional valve 1 has a single spring, namely the return spring 55.
[0066] An alternative embodiment of the proportional valve 1, which is not shown, can be configured such that the return spring 55 holds the valve core 30 in the closed position when the actuating device 50 is not actuated. This type of proportional valve is called an NC (normally closed) valve.
[0067] When the excitation coil 51 of the electromagnetic actuator 50 is energized, the push rod 52 causes the valve core 30 to move against the return spring 55 and causes the valve core 30 to move along the longitudinal axis L against the spring force of the return spring 55.
[0068] Control holes 15a, 15b, and 15c are arranged axially offset along the longitudinal axis L and have the same diameter in the illustrated embodiment. It should be noted that control holes 15a, 15b, and 15c may also have different diameters. It is also conceivable that control holes 15a, 15b, and 15c have the same axial position along the longitudinal axis L but different diameters.
[0069] The control holes 15a, 15b, and 15c arranged in this way allow the valve core 30 to move via the electromagnetic actuator, thus setting a defined profile of the opening cross-section of the control hole 15 and consequently, a hydraulic characteristic profile that varies with the valve core stroke. Therefore, it is possible to adapt the proportional valve 1 to the needs of the entire system or a shock absorber. At least two control holes 15 can be easily incorporated into the valve core 30 during its manufacturing process, wherein, in one step according to a preferred improvement, two control holes 15 of the same diameter are simultaneously incorporated onto opposite sides in the diametrical direction of the longitudinal axis L.
[0070] Furthermore, as can be seen from the accompanying drawings, the proportional valve 1 includes a pressure sensing pin 40 displaceable along the longitudinal axis L. The pressure sensing pin 40 is arranged in a through-hole 35 of the valve body 11 and preferably penetrates the through-hole 35. The through-hole 35 is preferably coaxial with the longitudinal axis L, i.e., centrally arranged in the bottom 20 of the valve body. The through-hole 35 also centrally penetrates the mandrel and the truncated cone 18, which is arranged on the bottom 20 of the valve body. Thus, the pressure sensing pin 40 is radially arranged within the return spring 55.
[0071] The pressure sensing pin 40 has a first end 41 and a second end 42, which are arranged on opposite sides along a longitudinal axis. Pressure applied to at least the inlet I can act on the first end 41. The second end 42 can effectively contact the valve core 30 or the valve core bottom 31.
[0072] The pressure sensing pin 40 also has a stop 45 disposed in the cavity 37 between the valve core 30 and the valve body 11. The stop 45 is preferably configured such that it can abut against the valve body 11 in an end position or against the valve body bottom 20 between the valve core 30 and the valve body 11. Furthermore, the stop 45 is preferably configured such that the pressure sensing pin 40 remains axially movable in an end position of the valve core 30 (where the control edge 33 of the valve core 30 contacts the valve body 11). The stop 45 can be configured as a head and can have a diameter larger than that of the perforation 35. On the one hand, the stop 45 defines the end position; on the other hand, the stop 45 serves as an anti-loss device for the pressure sensing pin 40.
[0073] The pressure sensing pin 40 transmits the pressure corresponding to the pressure at at least one inlet I to the valve core 30 along the longitudinal axis L.
[0074] According to the illustrated embodiment, the pressure sensing pin 40 can displace the valve core 31 against the force of the actuator 50 to the open position, thereby enabling the mechanical opening of the proportional valve 1 when high pressure is applied to at least one inlet I.
[0075] The force of the pressure sensing pin 40 can be adjusted by appropriately selecting the effective hydraulic diameter at the first end 41 of the pressure sensing pin 40. Depending on the application of the proposed proportional valve 1, the pressure sensing pin 40 can be implemented with different diameters, thereby enabling different pressures for moving the valve core 31 to be achieved according to the specific application.
[0076] Furthermore, as can be seen from the accompanying drawings, the push rod 52 or armature 54 has a pressure compensation orifice 58 through which the medium can flow along the longitudinal axis L through the push rod 52 or armature 54. Therefore, the medium can flow through the push rod 52 and / or armature 54 to a pressure balancing chamber 59 arranged on the side of the armature 54 opposite to the valve core 30. Thus, the pressure balancing chamber 59 is fluidly connected to the outlet E and pressure balancing can be achieved.
[0077] List of reference numerals
[0078] 1 proportional valve
[0079] 10 valve housing
[0080] 11 Valve body
[0081] 1211 inner surface
[0082] 1311 outer surface
[0083] 14 Outflow opening
[0084] 15 control holes
[0085] 16 control hole section
[0086] 18-fold cone
[0087] 19 end face
[0088] 20 Valve body bottom
[0089] 21 wall
[0090] 30 valve core
[0091] 31 Valve core bottom
[0092] 32 rings
[0093] 33 Control Edge
[0094] 34 pressure balance holes
[0095] 35 perforations
[0096] 37 cavity
[0097] 40 pressure sensing pins
[0098] 41 First end
[0099] 42 Second End
[0100] 45 stop
[0101] 50 actuators
[0102] 51 excitation coil
[0103] 52 pushers
[0104] 53 transistor
[0105] 54 armature
[0106] 55 return spring
[0107] 56 magnetic flanges
[0108] 58 pressure compensation holes
[0109] 59 Pressure Balance Chamber
[0110] E Exit
[0111] I entrance
[0112] L longitudinal axis
Claims
1. A proportional valve (1) having: - Valve housing (10) and valve body (11), the valve housing (10) having at least one inlet (I) and at least one outlet (E), the valve body (11) being fluidly disposed between the at least one inlet (I) and the at least one outlet (E) and having at least two control holes (15) connecting the at least one inlet (I) and the at least one outlet (E), and the control holes (15) opening to the outer surface (13) of the valve body (11). - Valve core (30), which is displaceably supported on the valve body (11) along the longitudinal axis (L); and - Electromagnetic actuator (50), the valve core (30) can be moved along the longitudinal axis (L) by the electromagnetic actuator (50) against the return spring (55) between a closed position that closes the at least two control holes (15) and an open position that at least partially releases the at least two control holes (15), Its features are, The at least two control holes (15) have different cross sections and / or the at least two control holes (15) extend to the outer surface (13) of the valve body (11) at staggered positions along the longitudinal axis (L).
2. The proportional valve (1) according to claim 1, characterized in that, The at least two control holes (15) are distributed around the longitudinal axis (L), preferably in pairs on opposite sides in the diametrical direction.
3. The proportional valve (1) according to any one of the preceding claims, characterized in that, The at least two control holes (15) are radially oriented relative to the longitudinal axis (L).
4. The proportional valve (1) according to any one of the preceding claims, characterized in that, A pressure sensing pin (40) displaceable along the longitudinal axis (L) is arranged on the valve body (11). The pressure acting on the at least one inlet (I) can act on the first end (41) of the pressure sensing pin (40), and the second end (42) of the pressure sensing pin (40) can effectively contact the valve core (30).
5. The proportional valve (1) according to any one of the preceding claims, characterized in that, The pressure sensing pin (40) has a stop (45) that is capable of abutting against the valve body (11) in an end position between the valve core (30) and the valve body (11).
6. The proportional valve (1) according to any one of the preceding claims, characterized in that, The pressure sensing pin (40) is free to move between the open position and the contact position on the valve core (30) when the at least one inlet (I) and the at least one outlet (E) are in a pressure-free state, in the open position or in the closed position.
7. The proportional valve (1) according to any one of the preceding claims, characterized in that, The return spring (55) holds the valve core (30) against the actuation device (50) in a biased manner.
8. The proportional valve (1) according to any one of the preceding claims, characterized in that, The at least two control holes (15) extend along the longitudinal axis (L) in the control hole section (16) to the inner surface (12) of the valve body (11), and the flowable cross section of the valve body (11) decreases along the longitudinal axis (L) from the inlet (I) in the control hole section (16).
9. The proportional valve according to any one of the preceding claims, characterized in that, The flowable cross section of the valve body (11) decreases from the inlet (I) along the longitudinal axis (L) through a truncated cone (18), a cylinder, a dome, or a cone.
10. The proportional valve according to any one of the preceding claims, characterized in that, The pressure sensing pin (40) penetrates the end face (19) of the truncated cone (18).
11. The proportional valve according to any one of the preceding claims, characterized in that, The valve core (30) has a wedge-shaped tapering control edge.
12. The proportional valve (1) according to any one of the preceding claims, characterized in that, The valve core (30) has at least one pressure balancing hole (34) that fluidly connects the at least one outlet (E) to a cavity surrounding the valve core (30) and the valve body (11).
13. The proportional valve (1) according to any one of the preceding claims, characterized in that, The actuation device (50) has a pressure compensation port (58) that connects the at least one outlet (E) to the pressure balance chamber (59) of the actuation device (50).
14. The proportional valve (1) according to any one of the preceding claims, characterized in that, The valve housing (10) has at least one outflow opening (14) forming the at least one outlet (E), and the position and / or size of the at least one outflow opening (14) along the longitudinal axis (L) corresponds to the position and / or size of at least one of the at least two control holes (15).
15. A shock absorber having a proportional valve (1) according to any one of the preceding claims.