CN117090891A - Damping valve device for shock absorber - Google Patents

Damping valve device for shock absorber Download PDF

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Publication number
CN117090891A
CN117090891A CN202310556962.4A CN202310556962A CN117090891A CN 117090891 A CN117090891 A CN 117090891A CN 202310556962 A CN202310556962 A CN 202310556962A CN 117090891 A CN117090891 A CN 117090891A
Authority
CN
China
Prior art keywords
return spring
valve device
damping valve
legs
valve element
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
CN202310556962.4A
Other languages
Chinese (zh)
Inventor
J·罗塞勒
M·马隆
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 CN117090891A publication Critical patent/CN117090891A/en
Pending legal-status Critical Current

Links

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
    • 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
    • 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
    • F16F9/3207—Constructional features
    • F16F9/3221—Constructional features of piston rods
    • 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
    • F16F9/3485—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 characterised by features of supporting elements intended to guide or limit the movement of the annular discs
    • 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
    • F16F9/3488—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 characterised by features intended to affect valve bias or pre-stress
    • 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
    • F16F9/18—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 with a closed cylinder and a piston separating two or more working spaces therein
    • F16F9/19—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 with a closed cylinder and a piston separating two or more working spaces therein with a single cylinder and of single-tube type
    • 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
    • F16F9/3207—Constructional features
    • F16F9/3214—Constructional features of pistons

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (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 guided, wherein the valve element has at least two legs which are connected to one another by a pivot bearing, wherein an annular slotted return spring is connected to the two legs and is held against rotation by a positive-locking connection at the two legs, wherein the sides of the valve element forming the positive-locking connection have a non-uniform radius at least in the angular section.

Description

Damping valve device for shock absorber
Technical Field
The present invention relates to a damping valve arrangement for a shock absorber according to the preamble of claim 1.
Background
A damping valve device is known from DE 10 2019 215 559 A1, which has two legs connected by a pendulum bearing as a valve element, which is equipped with an annular return spring. In the case of a slotted annular restoring spring, it is important for a reproducible damping force to assemble the restoring spring in a position relative to the pivot bearing in the circumferential direction and to hold the restoring spring in this assembled position. In this case, it is entirely desirable to arrange the return spring asymmetrically with respect to the pivot bearing, i.e. one lever arm of the return spring is longer than the second lever arm, the lever arms each being in relation to the pivot bearing.
In DE 10 2019 215 559 A1, a return spring is held in a cover-side annular groove in the leg in the embodiment of the damping valve device according to fig. 7 and 8. Furthermore, the return spring has an axially bent end in the region of the slot, which engages in the blind hole opening. Rotation of the return spring relative to the valve element is prevented by this positive-locking connection between the return spring and the two legs.
However, this embodiment of the return spring also has disadvantages. The slotted region of the return spring serves as the outflow cross section of the pressure chamber in the valve carrier of the damping valve device, which increases during the expansion movement of the valve element, since the ends of the return spring are remote from one another during the expansion movement of the valve element.
Furthermore, if the length section is bent in the spring element with a very small bending radius in order to form the described positive connection with the blind hole opening, this is disadvantageous in terms of crack formation.
Disclosure of Invention
The object of the present invention is to provide a return spring in such a damping valve arrangement that prevents rotation, wherein at least the disadvantages known from the prior art are minimized.
This object is achieved in that the side of the valve element forming the positive-locking connection has a non-uniform radius at least in the angular section.
The main advantage of this construction principle is that the plane in which the force vector of the return spring acting on the valve element is directed likewise forms a positive connection. This simplifies not only the geometry in the partial region of the valve element, but also the geometry of the return spring and thus the production of the return spring.
According to an advantageous development, the positively locking side is arranged offset in the axial direction and in the radial direction relative to the side of the damping valve device forming the throttle point. The form-fitting flanks thus do not have a significant influence on the damping force characteristic curve of the damping valve arrangement.
Preferably, the annular surface of the valve element, which connects the side forming the positive fit with the side forming the throttle point, supports the return spring. The return spring is thus oriented in its horizontal position relative to the valve element in such a way that no errors with respect to the return force occur.
A further measure for fixing the position of the return spring is that the return spring has a circumferential angle of more than 180 °.
A preferred embodiment is characterized in that the two legs combine to form an elliptical circumferential region. The oval sides do not contain discontinuities and therefore no local compressive stress peaks occur in the return spring.
In a further embodiment, the return spring also has an oval contact surface for the leg.
Alternatively, at least one leg may have a radial recess into which the return spring engages with a circumferential region. The recess may be sized so that it is very flat but still performs the desired function.
It can also be provided that at least one of the legs has a radially extending stop for a positive connection with the return spring. Such a stop can be produced very easily by sintering techniques.
The stop function can be used particularly easily if at least one end face at the notch of the return spring is supported at the stop.
Drawings
The invention is further explained with reference to the following description of the drawings. Wherein:
fig. 1 shows a sectional view of a shock absorber in the region of a damping valve arrangement;
FIGS. 2 and 3 show cross-sectional views of a damping valve device according to FIG. 1; and
fig. 4 to 6 show alternative variants of fig. 2 and 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 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 movable in the radial direction 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 equipped with a return spring 35, for example as shown enlarged in fig. 2. 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 shifted into the throttle position and a closing movement in the direction of the flow guide surface 33 is performed. Due to the high flow velocity of the damping medium in the throttle point 31 formed as an annular gap, a negative 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 and 3 show a vertical section and a cross section of the damping valve device 1. Collectively, it can be seen that the valve element 29 has two legs 49, 51 forming a loop. The two legs 49, 51 are connected to each other by a pivot bearing 53. The oscillating support 53 is optionally connected to the valve carrier 25. However, the pendulum support can also be supported in a radially floating manner in the annular groove 27. In this particular example, the valve element 29 comprises two legs 49, 51. In principle, a plurality of legs and a plurality of pivot bearings can also be used in order to adapt the closing behavior of the valve element 29 at the throttle point 31.
Fig. 2 shows a pressure space 55, which is formed by the annular groove base 57, the annular groove flanks 59, 61 of the valve carrier 25 and the inner flank 63 of the valve element 29. The pressure chamber 55 is connected to the working chamber 13 via at least one inflow opening 65 and at least one outflow opening 67. When the damping valve device 1 is arranged in the working chamber 15 remote from the piston rod, the inflow opening and the outflow opening are connected with the working chamber 15, respectively. Due to the dimensions of the inflow opening and the outflow opening, a pressure builds up in the pressure chamber 55, which pressure supports the expanding movement of the valve element 29. The annular return spring 35 is correspondingly larger in size when the pressure chamber 55 is used. Therefore, the positional deviation of the return spring 35 at the valve element 29 is also more greatly affected. To minimize this effect, the return spring 35 is prevented from rotating by a form-fit connection 69 at the two legs 49, 51 (fig. 3).
The basic principle of the rotation prevention is that the side 71 of the valve element 29 forming the form-fit connection 69 has a non-uniform radius at least in the angle section 73. Further, the return spring 35 has a circumferential angle of more than 180 °. The return spring 35 extends here over a circumferential angle of at least 90 ° on both sides of the pivot bearing 53. The return spring 35 is thereby fixed against radial pull-off forces under normal operating forces.
In the embodiment according to fig. 3, at least one leg 49, 51 has a radial recess 75 into which the return spring 35 engages in a circumferential region. The radial recess 75 is preferably embodied in the region of the pivot bearing 53. This arrangement also facilitates sintering to make the legs 49, 51.
The form-fitting side 71 is axially and radially offset relative to the side 37 of the damper valve arrangement 1, which forms the throttle point 31. The return spring 35 is thus located outside the side 37 associated with the determination of the throttle point 31. Furthermore, the annular surface 79 of the valve element 29, which connects the positively locking side 71 to the side 37 forming the throttle point, supports the return spring 35. In the simplest embodiment, the valve element 29 has an L-shaped cross section outside the pivot bearing 53 and outside the overlap in the region of the joint 81. The positively locking side face 71 and the annular ring 79 are oriented in the direction of the annular groove side wall 61 with the inflow opening 65. The expansion of the inflow opening 65 has little effect on the operating characteristics of the damping valve device 1 for the radial recess 75 of the web 83 penetrating the valve element 29 in the radial direction.
The embodiment of the invention according to fig. 4 follows the basic principle described in the embodiment of a form-fitting connection. In this case, the two legs 49, 51 form, in combination with their sides 71, an elliptical circumferential region. The return spring 35 has an elliptical abutment surface 85 for the legs 49, 51. For better recognition of the geometry design, the two legs 49, 51 have a radius R with respect to the long major axis of the ellipse s And has a radius r with respect to the short main axis s . Accordingly, the return spring 35 has a radius R for the long spindle F And has a radius r for a short main axis F . It is not absolutely necessary here for one of the two principal axes to intersect the pendulum support 53. The elliptical shape of the legs 49, 51 in the region of the side 71 and the elliptical shape of the return spring 35 prevent the two parts from rotating under normal operating forces.
The damping valve arrangement according to fig. 5 and 6 has a valve element 29 in which at least one of the legs 49, 51 has a radially extending stop 87, 89 for a positive connection 69 with the return spring 35. In this embodiment, stops 87, 89 are implemented at the two legs 49, 51. At least one end surface 91, 93 at the notch of the return spring 35 can be supported at the stop 87, 89 in the direction of the guide surface 33. For the stops 87, 89 only a small axial and radial extension is required to fulfil the intended function. Thereby, mechanical contact with the optional stop 95 for limiting the expansion movement of the valve element 29 can be easily avoided. In this illustration, the stops 87, 89 are formed by thin webs of connection. However, radial shoulders may alternatively be provided in the webs 83 of the legs 49, 51.
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. Leg portion
51. Leg portion
53. Swing support
55. Pressure chamber
57. Annular groove base surface
59. Side of annular groove
61. Side of annular groove
63. Inner side of valve element
65. Inflow opening
67. Outflow opening
69. Form-fitting connection
Form-fitting side surfaces of 71 valve element
73. Angular section
75. Radial recess
77 circumferential region for form-fitting connection
79. Circular face of valve element
81. Joint seam
83. Connecting piece of valve element
Elliptical abutment surface for 85 return spring
87. Stop block
89. Stop block
91. End face of return spring
93. An end face of the return spring.

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) with a diameter that can be varied is guided, wherein the valve element (29) has at least two legs (49, 51) which are connected to one another by means of a pivot bearing (53), wherein an annular slotted return spring (35) is connected to the two legs (49, 51) and is held against rotation at the two legs (49, 51) by means of a form-fit connection (69), characterized in that a side (71) of the valve element (29) forming the form-fit connection (69) is held against rotation at least in an angular section (77, R) s 、r s 87, 89) have non-uniform radii therein.
2. Damping valve device according to claim 1, characterized in that the form-fitting side (71) is arranged offset in the axial and radial direction relative to the side (37) of the damping valve device (1) forming the throttle point (31).
3. Damping valve device according to claim 1 or 2, characterized in that a circular ring surface (79) of the valve element (29) supports the return spring (35), which circular ring surface connects the side (71) forming the positive fit with the side (37) forming the throttle point (31).
4. Damping valve device according to at least one of claims 1 to 3, characterized in that the return spring (35) has a circumferential angle of more than 180 °.
5. Damping valve device according to at least one of claims 1 to 4, characterized in that the two legs (49, 51) combine to form an elliptical circumferential region.
6. Damping valve device according to claim 5, characterized in that the return spring (35) has an elliptical abutment surface (85) for the legs (49, 51).
7. Damping valve device according to at least one of claims 1 to 4, characterized in that at least one leg (49, 51) has a radial recess (75) into which the return spring (35) engages with a circumferential region (77).
8. Damping valve device according to at least one of claims 1 to 4, characterized in that at least one of the legs (49, 51) has a radially extending stop (87, 89) for a positive connection (69) with the return spring (35).
9. Damping valve device according to claim 8, characterized in that at least one end face (91, 93) at the notch of the return spring (35) is supported at the stop (87, 89).
CN202310556962.4A 2022-05-19 2023-05-17 Damping valve device for shock absorber Pending CN117090891A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102022205001.0 2022-05-19
DE102022205001.0A DE102022205001B3 (en) 2022-05-19 2022-05-19 Damping valve device for a vibration damper

Publications (1)

Publication Number Publication Date
CN117090891A true CN117090891A (en) 2023-11-21

Family

ID=88600127

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310556962.4A Pending CN117090891A (en) 2022-05-19 2023-05-17 Damping valve device for shock absorber

Country Status (2)

Country Link
CN (1) CN117090891A (en)
DE (1) DE102022205001B3 (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6179424B2 (en) 2014-02-28 2017-08-16 日立オートモティブシステムズ株式会社 Cylinder device
DE102019215559A1 (en) 2019-10-10 2021-04-15 Zf Friedrichshafen Ag Throttle point for a vibration damper
DE102019215558A1 (en) 2019-10-10 2021-04-15 Zf Friedrichshafen Ag Throttle point for a vibration damper
DE102019215561A1 (en) 2019-10-10 2021-04-15 Zf Friedrichshafen Ag Throttle point for a vibration damper
DE102020209121A1 (en) 2020-07-21 2022-01-27 Zf Friedrichshafen Ag Throttle point for a vibration damper
DE102021201439B3 (en) 2021-02-16 2022-05-12 Zf Friedrichshafen Ag Damping valve device for a vibration damper

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Publication number Publication date
DE102022205001B3 (en) 2023-11-23

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