CN115949695A - Switchable valve for a vibration damper - Google Patents
Switchable valve for a vibration damper Download PDFInfo
- Publication number
- CN115949695A CN115949695A CN202211192733.0A CN202211192733A CN115949695A CN 115949695 A CN115949695 A CN 115949695A CN 202211192733 A CN202211192733 A CN 202211192733A CN 115949695 A CN115949695 A CN 115949695A
- Authority
- CN
- China
- Prior art keywords
- valve
- switching valve
- valve body
- switching
- disk
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000007789 sealing Methods 0.000 claims description 5
- 239000006096 absorbing agent Substances 0.000 claims description 3
- 230000035939 shock Effects 0.000 claims description 3
- 238000013016 damping Methods 0.000 description 14
- 230000000903 blocking effect Effects 0.000 description 8
- 238000009434 installation Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/34—Special valve constructions; Shape or construction of throttling passages
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/44—Means on or in the damper for manual or non-automatic adjustment; such means combined with temperature correction
- F16F9/46—Means on or in the damper for manual or non-automatic adjustment; such means combined with temperature correction allowing control from a distance, i.e. location of means for control input being remote from site of valves, e.g. on damper external wall
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/34—Special valve constructions; Shape or construction of throttling passages
- F16F9/348—Throttling passages in the form of annular discs or other plate-like elements which may or may not have a spring action, operating in opposite directions or singly, e.g. annular discs positioned on top of the valve or piston body
- F16F9/3482—Throttling passages in the form of annular discs or other plate-like elements which may or may not have a spring action, operating in opposite directions or singly, e.g. annular discs positioned on top of the valve or piston body the annular discs being incorporated within the valve or piston body
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fluid-Damping Devices (AREA)
Abstract
The invention relates to a switching valve for a vibration damper, comprising an actuator, the force of which acts on an axially displaceable valve body of the switching valve, wherein the switching valve has a flow connection which extends partially through the valve body, the front end side of the valve body and the rear space of the switching valve being connected to one another and being designed hydraulically in parallel with an alternately throughflowing main flow channel of the switching valve, wherein the flow connection has a non-return valve which assumes a closed position when receiving an incoming flow from the main flow channel.
Description
Technical Field
The invention relates to a switchable valve for a shock absorber according to the preamble of claim 1.
Background
From fig. 2 of DE 195 00 904 A1, a switchable valve is known, which has an axially displaceable valve body which is traversed in both directions. The valve body is guided in an annular closing part of the piston rod. The through-going opening of the closing part defines with the valve body an annular interspace through which the damping medium passes to an annular space which is connected to the back space through a connection not shown. The rear space is connected to an axial passage inside the valve body, so that the front and rear end faces of the valve body are connected to each other.
The annular gap between the valve body and the closing portion provides the pressure of the damping medium when the closing portion is subjected to an incoming flow through the radial opening constituting the main flow channel of the switching valve. The mechanical latching force of the latching spring on the valve body may not be sufficient to hold the valve body in the latched position. This can lead to a malfunction of the damper.
A first solution to this problem can be to minimize the annular gap, in particular by using a seal at this location. Inevitably, the friction on the valve body will thereby become large. The friction force must be overcome by an electromagnetic actuator. It is also difficult to subject the friction to relatively large fluctuations. The latching force of the latching spring must then be greater, whereby the force of the actuator must also be raised in order to cause a reciprocating movement of the valve body against the latching force of the latching spring.
Disclosure of Invention
The object of the present invention is to provide a further solution to the leakage problem known from the prior art.
This object is achieved in that the flow connection has a non-return valve which assumes a closed position when subjected to an incoming flow from the main flow channel.
The advantage of the invention is that no additional, undefined forces act on the valve body which have to be compensated by the actuator. More specifically, the use of a check valve eliminates the cause for adverse valve action.
Preferably, the axial connection in the valve body constitutes an integral part of the check valve as part of the flow connection. Therefore, no additional channel guide is required for the check valve.
In a further advantageous embodiment, the valve body has a seat surface for the non-return valve. The check valve in the form of a seat valve reliably closes the flow connection.
According to an advantageous embodiment, it is provided that the non-return valve has a valve disk. The valve disk requires less axial installation space than the valve ball.
The valve disk is preferably clamped to the valve body on the edge side. A relatively small force acts on the check valve in the lifting direction, so that a slight interference fit between the valve disc and the valve body is sufficient to generate the necessary clamping force.
In view of the simple structural form of the check valve, the axial connection piece has a stepped contour, with which the clamping edge of the valve disk is connected. Accordingly, the check valve does not require additional installation space, which requires an axial extension of the valve body.
In view of reliably maintaining the closed position of the valve disc, the valve seat surface is offset axially with respect to the step of the stepped profile.
A preferred embodiment of the valve disk is characterized in that the valve disk has a c-shaped recess which separates the axially displaceable sealing gasket and the at least one spring arm from the clamping edge. The movable region of the valve disk is thereby clearly separated from the clamping edge, so that no clamping force can act on the movable part of the valve disk.
Drawings
The invention is explained in more detail with reference to the following figures.
The figures show that:
FIG. 1 is a longitudinal cross-sectional view of a shock absorber with a switching valve according to the present invention;
fig. 2 is a top view of the valve body with check valve according to fig. 1.
Detailed Description
Fig. 1 shows a longitudinal section of a damper 1 in the region of a switching valve 3. The vibration damper 1 comprises a cylinder 5 in which a piston rod 7 is guided axially displaceably. A piston 9 is fastened to the piston rod 7, which piston is additionally formed with a frequency-selective damping valve assembly 11 as described in DE 10 2016 217 A1, the description of which is also part of the description of the present figure. The piston 9 divides the cylinder 5 into a piston rod-side working space 13 and a piston rod-remote working space 15. The damping valve assembly 11 has a bypass channel 17 inside the piston rod 7, which connects the piston rod-side working space 13 with the damping valve assembly 11. The switching valve 3 can change the starting point (Einsatzpunkt) of the damper valve assembly 11. For a switching valve with a 0-1 function, the damper valve assembly 11 is opened or closed. In principle, the invention is not limited to a combination with such a damping valve assembly 11. A simple hydraulic bridging of the damping valves 19, 21 can also be achieved by such a switching valve 3 and the bypass channel 17 without the damping valve assembly 11.
The solenoid 25, which exerts an adjusting force on the axially movable valve body 27, is located in the valve housing 23 of the switching valve 3, which is fixed to the piston rod 7 inside the piston-rod-side working space 13. The force of the locking spring 29 acts on the valve body 27, which pretensions the valve body 27 against the valve seat surface 31. The coil 25, the valve body 27 and the lock spring 29 constitute an actuator for switching the valve 3. In a greatly simplified manner, the valve body 27 has a sleeve section 33 with a flange 35. The flange 35 and the bottom 37 of the valve body 27 define a rear space 39 of the switching valve. The sealed separating washer 41 and the inner wall of the valve housing 23 form a further wall region of the rear space 39.
The sleeve section 33 of the valve body 27 is mounted in a sliding manner in a guide 43 of the valve housing 23. The guide 43 has a bearing journal 45 for the piston 9 and the damping valve assembly 11. Furthermore, the bottom 47 of the guide constitutes the valve seat surface 31 for the switching valve 3. An annular space 49 inside the guide 43 between the base 47 and a guide surface 51 for the valve body 27 covers the sleeve section 33 from the outside. At least one radial channel as a main flow channel 53 connects the piston-rod-side working space 13 with the annular space 49 and thus with the valve seat surface 31 of the switching valve 3.
In addition to the bypass channel 17, the switching valve 3 also has a flow connection 55 which extends between the main flow channel 53 and the valve seat surface 31. In addition to the annular gap 57 between the sleeve section 33 and the guide surface 51 of the guide 43, the flow connection 55 also comprises an annular intermediate space 59 between the guide 43 and the flange 35. At least one through-opening 61 in the interior of the flange 35 of the valve body 27 forms a further section. Furthermore, the rear space 39 is a partial section of the flow connection 55. The further continuously open annular gap 63 between the stationary guide body 65 and the flange 35 leads to an axial connection 65 inside the valve body 27, which terminates on the valve seat surface 31 of the switching valve. The flow connection 55 provides a hydraulic force applied to the valve body 27. The section of the flow connection 55 located inside the valve body 27 is designed with a stepped contour, so that inside the bottom 37 of the valve body 27 there is a throttle cross section 67 which provides a targeted pressure buildup and thus an additional hydraulic blocking force acting on the valve body 27.
In order to optimize the hydraulic blocking force on the valve body 27, the flow connection 55 has a check valve 71 which assumes a closed position when receiving an incoming flow from the main flow channel 53. The axial connection 65 in the valve body 27 forms part of the non-return valve 71. For this purpose, the valve body 27 has a valve seat surface 73 for the non-return valve 71, which is offset in the axial direction with respect to the step of the stepped contour of the valve body 27. Valve disc 75 constitutes another component of check valve 71.
In principle, the valve disk 75 is mounted so as to be axially movable between the guide body 65 and the valve seat surface 73. In order to ensure safe handling of the valve part during assembly, the valve disk 75 is clamped to the valve body 27 on the edge side. In particular, the clamping edge 77 of the valve disc 75 clamps against the wall of the stepped profile of the valve body 27. (see FIG. 2)
Fig. 2 shows a top view of the valve body 27 with the check valve 71. An annular groove 79 with a plurality of through openings 61 can be seen. The valve disk 75 is clamped in the interior of the axial connection 65 and has a c-shaped recess 81 which separates an axially displaceable sealing washer 83 and at least one spring arm 85 from the clamping edge 77. During the reciprocating movement of the sealing washer 83, the clamping edge 77 is held stationary inside the stepped profile of the axial connection 65.
If the switching valve 3 is supplied with an incoming flow from the piston-rod-side working space 13, i.e. during an extension movement of the piston rod 7, the damping medium flows via the main flow channel 53 to the switching valve 3, whose valve body 27 rests on the valve seat surface 31 in the closed switching valve position in the state in which the coil 25 is not energized. The smaller volume flow flows into the intermediate space 59 via the annular recess 57 on the guide surface 51 and into the rear space 39 via the through-opening 61. The other flow paths lead via an annular recess 63 in the guide body 65 into an axial connection 65 of the valve body 27. The other flow path is blocked by the closed check valve 71. The entire cross section of the rear space 39 thus constitutes a pressure surface for applying a hydraulic blocking force to the valve body 27. The intermediate space 59 together with the cross section of the flange 35 of the valve body 27 provides a lifting force on the valve body 27. By measuring the cross section of the through-opening 61 and the cross section of the annular recess 63 in the guide body 65, the pressure ratio and thus the hydraulic blocking force acting on the valve body 27 can be set. Due to the relatively large remaining area of the rear space 39 relative to the intermediate space 59, a blocking force can easily be generated which supports the blocking force of the blocking spring 29, so that an undesired opening of the switching valve 3 is reliably prevented.
When the valve body 27 is subjected to an incoming flow from the bypass channel 17 inside the piston rod 7 or the bearing journal 45, the damping medium flowing into the valve body 27 can flow into the rear space 39 via the open non-return valve 71, and thus a targeted blocking force is applied to the valve body 27, so that no uncontrolled opening movement of the valve body 27 can occur in the direction of flow from the bypass channel 17 in the piston rod to the main flow channel 53 in the valve housing 23.
List of reference numerals:
1. vibration damper
3. Switching valve
5. Column body
7. Piston rod
9. Piston
11. Damping valve assembly
13. Working space on one side of piston rod
15. Working space far away from piston rod
17. Bypass valve
19. Damping valve
21. Damping valve
23. Valve housing
25. Coil
27. Valve body
29. Locking spring
31. Valve seat surface
33. Sleeve segment
35. Flange
37. Bottom part
39. Rear space
41. Separating washer
43. Guide part
45. Bearing journal
47. Bottom of the guide part
49. Annular space
51. Guide surface
53. Main flow channel
55. Flow connector
57. Annular gap
59. Intermediate space
61. Through opening
63. Annular gap
65. Axial connector
67. Throttle cross section
69. Bottom part
71. Check valve
73. Valve seat surface
75. Valve disk
77. Clamping edge
79. Annular groove
81. Notch (S)
83. Sealing washer
85. Spring arm
Claims (8)
1. A switching valve (3) for a shock absorber (1), comprising an actuator (25, 27, 29), the force of which acts on an axially movable valve body (27) of the switching valve (3), wherein the switching valve (3) has a flow connection (55) which extends partially through the valve body (27), wherein a front end side (31) of the valve body (27) and a rear space (39) of the switching valve (3) are connected to one another and are designed hydraulically in parallel with an alternately through main flow channel (53) of the switching valve (3), characterized in that the flow connection (55) has a non-return valve (71) which assumes a closed position when subjected to an incoming flow from the main flow channel (53).
2. A switching valve according to claim 1, characterized in that the axial connection (65) in the valve body (27) constitutes an integral part of the non-return valve (71) as part of the flow connection (55).
3. The switching valve according to claim 2, characterized in that the valve body (27) has a seat surface (73) for the non-return valve (71).
4. The switching valve according to at least one of claims 1 to 3, characterized in that the non-return valve (71) has a valve disk (75).
5. The switching valve according to claim 4, characterized in that the valve disk (75) is clamped to the valve body (27) on the edge side.
6. The switching valve according to claim 5, characterized in that the axial connection (65) has a stepped profile, with which the clamping edge (77) of the valve disk (75) is connected.
7. The switching valve according to at least one of claims 1 to 6, characterized in that the valve seat surface (73) is offset in axial direction with respect to the step (69) of the stepped profile.
8. The switching valve according to at least one of claims 4 to 7, characterized in that the valve disk (75) has a c-shaped recess (81) which separates an axially movable sealing washer (83) and at least one spring arm (85) from the clamping edge (77).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102021211322.2 | 2021-10-07 | ||
| DE102021211322 | 2021-10-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115949695A true CN115949695A (en) | 2023-04-11 |
Family
ID=85705654
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211192733.0A Pending CN115949695A (en) | 2021-10-07 | 2022-09-28 | Switchable valve for a vibration damper |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN115949695A (en) |
| DE (1) | DE102022208732A1 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2106667B1 (en) | 1994-01-15 | 1998-05-16 | Fichtel & Sachs Ag | VALVE ACTUATION INSTALLATION, IN PARTICULAR FOR A VIBRATION DAMPER. |
| DE102016217117A1 (en) | 2016-09-08 | 2016-12-01 | Zf Friedrichshafen Ag | Frequency-selective damping valve arrangement |
-
2022
- 2022-08-24 DE DE102022208732.1A patent/DE102022208732A1/en active Pending
- 2022-09-28 CN CN202211192733.0A patent/CN115949695A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE102022208732A1 (en) | 2023-04-13 |
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|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination |