CN117090893A - Damping valve device for shock absorber - Google Patents

Damping valve device for shock absorber Download PDF

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Publication number
CN117090893A
CN117090893A CN202310555699.7A CN202310555699A CN117090893A CN 117090893 A CN117090893 A CN 117090893A CN 202310555699 A CN202310555699 A CN 202310555699A CN 117090893 A CN117090893 A CN 117090893A
Authority
CN
China
Prior art keywords
valve
membrane
valve element
damping
carrier
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
Application number
CN202310555699.7A
Other languages
Chinese (zh)
Inventor
J·罗塞勒
A·科内泽维奇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZF Friedrichshafen AG
Original Assignee
ZF Friedrichshafen AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by ZF Friedrichshafen AG filed Critical ZF Friedrichshafen AG
Publication of CN117090893A publication Critical patent/CN117090893A/en
Pending legal-status Critical Current

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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
    • F16F9/346—Throttling passages in the form of slots arranged in cylinder walls
    • F16F9/3465—Slots having a variable section along their length
    • 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
    • F16F9/3405—Throttling passages in or on piston body, e.g. slots
    • 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
    • F16F9/36—Special sealings, including sealings or guides for piston-rods
    • F16F9/368—Sealings in pistons
    • 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
    • F16F9/36—Special sealings, including sealings or guides for piston-rods
    • F16F9/369—Sealings for elements other than pistons or piston rods, e.g. valves
    • 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
    • F16F9/50—Special means providing automatic damping adjustment, i.e. self-adjustment of damping by particular sliding movements of a valve element, other than flexions or displacement of valve discs; Special means providing self-adjustment of spring characteristics
    • F16F9/512—Means responsive to load action, i.e. static load on the damper or dynamic fluid pressure changes in the damper, e.g. due to changes in velocity
    • F16F9/5126—Piston, or piston-like valve elements
    • 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
    • F16F2222/00—Special physical effects, e.g. nature of damping effects
    • F16F2222/12—Fluid damping
    • F16F2222/123—Fluid damping decreasing with increasing flow
    • 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
    • F16F2228/00—Functional characteristics, e.g. variability, frequency-dependence
    • F16F2228/001—Specific functional characteristics in numerical form or in the form of equations
    • F16F2228/004—Force or pressure
    • 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
    • F16F9/10—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using liquid only; using a fluid of which the nature is immaterial
    • F16F9/14—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect
    • F16F9/16—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fluid-Damping Devices (AREA)

Abstract

The invention relates to a damping valve device for a shock absorber, comprising a valve carrier with an annular groove in which a valve element of variable diameter is arranged, the valve element forming a throttle point together with a flow guiding surface, wherein the valve element changes from a flow-through position to a throttle position as the flow speed in the throttle point increases, wherein the side of the valve element and the annular groove of the valve carrier form a pressure chamber, which is sealed in the region of the valve element, wherein the valve element is formed by a membrane which is sealingly fastened to the valve carrier.

Description

Damping valve device for shock absorber
Technical Field
The present invention relates to a damping valve device for a shock absorber according to the preamble of claim 1.
Background
A damping valve device for a shock absorber is known from DE 10 2016210 790A1, in which an elastic valve element performs a radial expansion in order to control a throttle point between an outer surface and an inner wall of a working cylinder by means of the expansion movement. The expansion movement depends on the flow velocity in the throttle point. The higher the flow velocity, the lower the pressure level in the restriction. The pressure reduction produced here causes an expanding movement of the valve element.
Patent document DE 10 2020 209 112 A1 is an improvement of the damping valve device according to patent document DE 10 2016210 790a 1. In this embodiment, the pressure chamber is used for additional expansion forces. The pressure chamber is formed by an annular groove of the valve carrier and an inner side of the valve element. For this purpose, the valve carrier has at least one inflow opening and at least one outflow opening. However, the attendant advantages of the pressure chamber in turn place additional demands on the damping valve arrangement. The cross-sections of the inflow opening and the outflow opening must be defined precisely, since the pressure in the pressure chamber is established by the dimensional ratio of the two cross-sections. Leakage of the pressure chamber results in a deviation between the target function and the actual function of the damping valve arrangement. The damping valve device therefore has a seal in the region of the annular groove flowing into the valve carrier. However, this seal results in an additional friction force between the valve element and the valve carrier, since the valve element is pressed by the damping medium flowing into the pressure chamber and the first cover side at the side wall of the annular groove on the one hand, and friction is present at the seal between the second cover side of the valve element and the side wall of the second annular groove on the other hand. The friction force varies depending on manufacturing variations of the valve carrier, the valve element and the sealing portion.
Disclosure of Invention
The object of the present invention is to eliminate the sealing problem at valve elements known from the prior art.
This object is achieved in that the valve element is formed by a membrane which is sealingly fastened at the valve carrier.
The membrane performs the dual function of effecting the valve movement and effecting the seal at the membrane.
In a further advantageous embodiment, the membrane is fastened to the side of the valve carrier. Thus, the film is easy to assemble.
Preferably, the membrane is held at the valve carrier by at least one retaining ring. Thus, the membrane does not have to have a self-pretension against the valve carrier.
As regards a specific embodiment of the throttle point, the membrane is held in the direction of the pressure chamber by a support ring having at least one pressure-conducting connection to the membrane. The support ring centers the membrane on the guide surface and ensures that the membrane is only subjected to expanding loads.
The support ring is radially fixed relative to the valve carrier and therefore does not limit the structural height of the annular groove.
Preferably, the support ring is attached to a side of the valve carrier that is directed in the direction of the valve element. The support ring and the membrane can then be held together by the securing ring.
Alternatively, the support ring may have a plurality of pressure-conducting connections, in which connection transfer pins connecting the pressure chamber with the membrane are guided. Thus, the membrane may perform an uneven adjustment movement in the circumferential direction, for example to allow a delayed activation of the damping function.
Additional functionality may be achieved by at least one transfer pin having a stop limiting the diameter change of the membrane.
If the transfer pins have different cross-sectional dimensions in the region of the connection, a non-uniform adjustment movement of the membrane can thereby be reinforced. The transfer pin determines the pressure surface of the membrane in the direction of adjustment of the throttle point. The circumferential section of the membrane with the largest cross-section in the direction of the pressure chamber at the transfer pin will first perform an adjusting movement.
Drawings
The invention is further explained with reference to the following description of the drawings. Wherein:
fig. 1 shows a shock absorber with a damping valve device in longitudinal section;
FIG. 2 shows a detailed illustration of the damping valve arrangement according to FIG. 1;
fig. 3 shows an alternative variant of the damping valve device according to fig. 2; and
fig. 4 shows an expanded view of the support ring according to fig. 3.
Detailed Description
Fig. 1 shows a damping valve arrangement 1 for a shock absorber 3 of any construction type, which shock absorber is only partially shown. In addition to the damping valve device 1, the shock absorber 3 also comprises a first damping valve 5, which has a damping valve body embodied as a piston 7, which is fastened at a piston rod 9.
The damping valve body 7 divides the cylinder body 11 of the shock absorber into a working chamber 13 on the piston rod side and a working chamber 15 remote from the piston rod, both working chambers being filled with damping medium. In the damping valve body 7, through-passages 17, 19 are respectively embodied on different pitch circles for the flow direction. The design of the through-channels 17, 19 is merely exemplary. The outlet side of the through-channels 17, 19 is at least partially covered by at least one valve disk 21, 23.
For example, the valve carrier 25 of the damping valve device 1 is directly fixed at the piston rod 9.
The valve carrier 25 has a circumferential annular groove 27 in which a valve element 29 of variable diameter is guided. The valve element 29 is radially movable and forms a valve body for the throttle point 31 as part of the damping valve device 1. The valve element 29 forms a throttle point 31 with the inner wall of the cylinder 11, wherein the inner wall is a flow guiding surface 33.
The valve element 29 is provided with a return spring 35 as required. Between the flow guide surface 33 and the outer side surface 37 of the valve element 29 there is a variable throttle section 39, which generates an additional damping force.
When the piston rod speed is in the first operating range, for example less than 0.5m/s, the throttle point 31 is fully opened. The damping force is then only generated by the through passages 17, 19 in combination with the valve discs 21, 23. When flowing past the valve disks 21, 23, the valve disks 21, 23 lift from their valve seat surfaces 41, 43. The lifting movement is limited by the support discs 45, 47, respectively.
In the second operating range of the piston rod speed, in which case the piston rod speed is greater than the limit speed of the first operating range, i.e. greater than the exemplary given 0.5m/s, the valve element 29 is brought into the throttle position and a closing movement in the direction of the flow guide surface 33 is effected. Due to the high flow velocity of the damping medium in the throttle point 31 formed as an annular gap, a reduced pressure is formed, which causes the valve element 29 to expand radially. The return spring 35 returns the valve element 29 back to the starting position with the greatest throttle section 39.
Fig. 2 shows the damping valve device 1 on an enlarged scale. The inner side 49 of the valve element 29 and the annular groove 27 of the valve carrier 25 form a pressure chamber 51, which is delimited at the outer edge by the valve element 29. The valve element 29 is formed by an annular membrane which is sealingly fixed at the valve carrier 25. The pressure chamber 51 is furthermore connected to the piston-rod-side working chamber 13 via an inflow opening 53 and an outflow opening 55. In principle, a manner in which the damping valve device 1 with the hydraulic connection is arranged remote from the working chamber 15 of the piston rod is likewise possible. The pressure chamber 51 is permanently filled with damping medium. When flowing through the throttle point 31, the pressure chamber 51 applies pressure through the inflow opening 53, since the cross section of the inflow opening 53 is larger than the cross section of the outflow opening 55. The difference in size between the inflow opening 53 and the outflow opening 55 is determined according to the desired damping force function.
The membrane 29 is fastened at a side 57 of the valve carrier 25 which is directed in the direction of the flow guiding surface 33. Thereby keeping the cover sides 59, 61 of the valve carrier 25 uncovered by the membrane 29. In the simplest case, the membrane 29 may be fixed at the valve carrier 25 due to inherent stresses. In the embodiment according to fig. 2, the membrane 29 is held at the valve carrier 25 by at least one securing ring 63. Thus, the membrane 29 does not have to have an inherent stress. A single securing ring 63 may be used which has a U-shaped profile and is pushed radially onto the cover sides 59, 61 of the valve carrier 25. The dash-dot line represents the fastener 65 between the securing ring 63 and the valve carrier 25, but again represents a weld or bond point. However, it is also conceivable to use two corner rings (i.e. clamping rings) fastened to the cover sides 59, 61 of the valve carrier 25 as fastening rings. At the at least one securing ring 63, a window 67 is provided, through which the membrane 29 can be deformed in the direction of the flow guiding surface 33.
The embodiment of the damping valve device 1 according to fig. 3 is based on the structural principle according to fig. 2. The difference is that the membrane 29 is held in the direction towards the pressure chamber 51 by a support ring 69 having at least one pressure-conducting connection 71 to the membrane. The plurality of openings in the support ring 69, which extend in the circumferential direction and are radially fixed relative to the valve carrier 25, serve as pressure-conducting connections 71 by the support ring 69 abutting against a side 57 of the valve carrier 25 which faces in the direction of the valve element 29. The support ring 69 and the membrane 29 have the same axial structural height within the scope of manufacturing accuracy, so that the fixing ring 63 can hold the support ring 69 in addition to the membrane 29.
The support ring 69 ensures that the membrane 29 is supported in the direction towards the pressure chamber 51. Thus, the membrane 29 is only subjected to an expansion load, for which purpose the membrane is deformed on one side in the direction of the flow guiding surface 33. In the maximum flow position of the throttle point 31, the membrane 29 is in contact with the support ring 69. The pressure chamber 51 and the membrane 29 are hydraulically connected to each other via an opening 71, so that the pressure in the pressure chamber 51 can act on the membrane 29.
However, it can also be provided that the support ring 69 has a plurality of pressure-conducting connections 71, in which transfer pins 73 are guided, which connect the pressure chamber 51 to the membrane 29. This variant in turn represents a modification of the support ring 69 with a simple opening 71. The pressure in the pressure chamber 51 is transmitted to the membrane 29 via the transmission pin 73. Optionally, at least one transfer peg 73 may have a stop 75, which stop 75 limits the diameter variation of the membrane 29 by the stop 75 coming from the inside against the support ring 69.
As can be seen from the developed view of the support ring 69 according to fig. 4, the transfer pins 73 can have different cross-sectional dimensions in the region of the connection 71. By this measure, a non-uniform transmission of forces in the circumferential direction to the membrane 29 is achieved, for example, in order to achieve a retarded throttle movement of the membrane 29.
List of reference numerals
1. Damping valve device
3. Vibration damper
5. First damping valve
7. Damping valve body
9. Piston rod
11. Cylinder body
13. Working chamber on piston rod side
15. Working chamber far away from piston rod
17. Through channel
19. Through channel
21. Valve disc
23. Valve disc
25. Valve carrier
27. Annular groove
29. Valve element
31. Throttle position
33. Flow guiding surface
35. Reset spring
37. Outer side of valve element
39. Throttle section of throttle position
41. Valve seat surface
43. Valve seat surface
45. Supporting disk
47. Supporting disk
49. Inner side surface
51. Pressure chamber
53. Inflow opening
55. Outflow opening
57. Outer side of valve carrier
59. Cover side
61. Cover side
63. Fixing ring
65. Fastening piece
67. Window-shaped opening
69. Support ring
71. Pressure-conducting connection
73. Transmission bolt
75. A stop.

Claims (9)

1. Damping valve device (1) for a shock absorber (3), comprising a valve carrier (25) with an annular groove (27) in which a valve element (29) of variable diameter is arranged, which valve element forms together with a flow guiding surface (33) a throttle point (31), wherein the valve element (29) changes from a flow-through position to a throttle position as the flow velocity in the throttle point (31) increases, wherein a side face (49) of the valve element (29) and the annular groove (27) of the valve carrier (25) form a pressure chamber (51) which is sealed in the region of the valve element (29), characterized in that the valve element (29) is formed by a membrane which is sealingly fastened at the valve carrier (25).
2. Damping valve device according to claim 1, characterized in that the membrane (29) is fastened at a side (57) of the valve carrier (25).
3. Damping valve device according to claim 2, characterized in that the membrane (29) is held at the valve carrier (25) by at least one securing ring (63).
4. A damping valve device according to at least one of claims 1 to 3, characterized in that the membrane (29) is held in the direction towards the pressure chamber (51) by a support ring (69) having at least one pressure-conducting connection (71) to the membrane (29).
5. Damping valve device according to claim 4, characterized in that the support ring (69) is radially fixed with respect to the valve carrier (25).
6. Damping valve device according to claim 5, characterized in that the support ring (69) bears against a side (57) of the valve carrier (25) which is directed in the direction of the valve element (29).
7. Damping valve device according to at least one of claims 4 to 6, characterized in that the support ring (69) has a plurality of pressure-conducting connections (71), in which connections transfer pins (73) are guided, which connect the pressure chamber (51) with the membrane (29).
8. Damping valve device according to claim 7, characterized in that at least one transfer peg (73) has a stop (75) which limits the diameter variation of the membrane (29).
9. Damping valve device according to at least one of claims 7 or 8, characterized in that the transfer pins (73) have different cross-sectional dimensions in the region of the connection (71).
CN202310555699.7A 2022-05-19 2023-05-17 Damping valve device for shock absorber Pending CN117090893A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102022205003.7A DE102022205003B3 (en) 2022-05-19 2022-05-19 Damping valve device for a vibration damper
DE102022205003.7 2022-05-19

Publications (1)

Publication Number Publication Date
CN117090893A true CN117090893A (en) 2023-11-21

Family

ID=86317401

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310555699.7A Pending CN117090893A (en) 2022-05-19 2023-05-17 Damping valve device for shock absorber

Country Status (2)

Country Link
CN (1) CN117090893A (en)
DE (1) DE102022205003B3 (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016210790A1 (en) 2016-06-16 2017-12-21 Zf Friedrichshafen Ag Damping valve device with progressive damping force characteristic
DE102020209112A1 (en) 2020-07-21 2022-01-27 Zf Friedrichshafen Ag Throttle point for a vibration damper
DE102021201430A1 (en) 2021-02-16 2022-08-18 Zf Friedrichshafen Ag Damping valve device for a vibration damper

Also Published As

Publication number Publication date
DE102022205003B3 (en) 2023-06-01

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