US20010035212A1 - Damping valve - Google Patents
Damping valve Download PDFInfo
- Publication number
- US20010035212A1 US20010035212A1 US09/800,686 US80068601A US2001035212A1 US 20010035212 A1 US20010035212 A1 US 20010035212A1 US 80068601 A US80068601 A US 80068601A US 2001035212 A1 US2001035212 A1 US 2001035212A1
- Authority
- US
- United States
- Prior art keywords
- passages
- damping
- sides
- valve
- outlet openings
- 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.)
- Granted
Links
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
- F16F9/3207—Constructional features
- F16F9/3214—Constructional features of 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
- F16F9/34—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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/7722—Line condition change responsive valves
- Y10T137/7771—Bi-directional flow valves
- Y10T137/7779—Axes of ports parallel
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/7722—Line condition change responsive valves
- Y10T137/7771—Bi-directional flow valves
- Y10T137/778—Axes of ports co-axial
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/7722—Line condition change responsive valves
- Y10T137/7837—Direct response valves [i.e., check valve type]
- Y10T137/7879—Resilient material valve
- Y10T137/7888—With valve member flexing about securement
- Y10T137/789—Central mount
Definitions
- the invention relates to a damping valve of the type having a one piece damping valve body with axial through passages for each direction of flow, a valve disk which at least partially covers outlet openings of through passages on at least one of said sides, and radial inflow openings for through passages.
- U.S. Pat. No. 5,259,294 discloses a sintered piston having two interengaging halves that together define the through-passages.
- damping-valve bodies of this kind there is, on the one hand, a need for complex sintering dies and, on the other hand, there is always the possibility that the damping-valve body will leak between the contact faces of the two halves of the piston.
- the complex form of the sintering dies is due to the fact that the through-passages have oblique sections.
- the damping valve comprises two piston halves with through-passages for two directions of flow. Arranged on a radially outer pitch circle are axially extending inflow passages, the ends of which are connected to a common nonreturn valve. The nonreturn valve opens a transverse passage that leads to the through-passages with the outlet openings.
- DE 40 33 186 A1 describes a restriction device with a bypass circuit dependent on the direction of motion that has axially extending through-passages in conjunction with radial inflow openings.
- measures have to be provided to prevent the valve disks sticking on the piston surface, e.g. by roughening the piston surface in the region of the valve disks.
- the through-passages or at least the outlet openings are furthermore kept relatively small, as a result of which the damping forces of the restriction device are relatively large.
- the outlet openings of the through-passages for a first direction of flow on one side of the damping-valve body have a trapezoidal cross section
- the outlet openings of the through-passages for a second direction of flow on the other side of the damping-valve body open into a common encircling annular channel.
- the through-passages with outlet openings with the trapezoidal cross section are arranged on a larger pitch circle than the through-passages that open into the annular passage.
- the advantage of the new damping valve lies, on the one hand, in its simple damping-valve body and, on the other hand, in the large areas subjected to pressure on the valve disks.
- the sum of the trapezoidal cross sections should be regarded as one area subjected to pressure.
- the annular channel forms the area subjected to pressure for the valve disk for the other direction of flow.
- the larger pitch circle for the outlet openings of trapezoidal cross section represents a larger lever arm for the pressure acting on the valve disk.
- the annular passage acting in its entirety as an area subjected to pressure can therefore be made radially further inward and nevertheless produce the desired low damping force.
- the radial inflow openings are connected by an encircling channel at their radially inner ends.
- the outlet openings of trapezoidal cross section are framed by an encircling ridge, one portion of the encircling ridge bounding the encircling channel.
- the ridge forms support surfaces for the valve disk for the first direction of flow.
- the radial inflow openings are arranged between the outlet openings of trapezoidal cross section, an adjoining portion of the through-passage being embodied as a funnel.
- the funnel is a shape that is easy to form and allows advantageous deflection of the damping medium from the radial inflow opening into the axial through-passage.
- the funnel of the throughpassage is framed over an arc segment by the encircling ridge of the outlet opening of trapezoidal cross section.
- the aim of this measure is to achieve as large as possible a funnel opening.
- FIG. 1 shows a damping-valve body of the damping valve in plan view
- FIG. 2 shows a damping-valve body in accordance with section A-A
- FIG. 3 shows a damping-valve body in accordance with section B-B
- FIGS. 4 a - 4 c show a damping valve with various fittings.
- FIG. 1 shows a damping-valve body 1 , which is produced by a sintering technique and is in one piece.
- Transverse through-passages 5 for a first direction of flow are formed on a first pitch circle 3 .
- the transverse through-passages 5 have a trapezoidal outlet opening. Each outlet opening is framed by an encircling ridge 7 .
- Radially extending inflow openings 9 for through-passages 11 are formed on a smaller pitch circle 13 between the circumferentially arranged transverse through-passages 5 with the trapezoidal outlet openings.
- the through-passages 11 Toward the inflow openings 9 , the through-passages 11 have funnels 15 (see FIG. 2), contour lines being provided to make this clear.
- the inflow openings 9 and hence also the through-passages 11 are connected on one side 19 of the damping valve by an encircling channel 17 .
- the same through-passages 11 On the opposite side 21 of the damping-valve body, the same through-passages 11 have an encircling annular passage 23 (see FIGS. 2 and 3).
- the encircling passage 17 is separated from the through-passages 5 by the ridge 7 and is filled with a damping medium. Consequently, only the sum of the end faces of the ridge 7 plus an annular clamping surface 25 remain as valve support surfaces. Sticking of a valve disk on the damping-valve body is therefore to be considered to be unlikely.
- the funnels 15 of the through-passages 11 are dimensioned in such a way that they are framed by an arc segment 27 of the ridges 7 , the trapezoidal outlet openings of the through-passages 5 having an arc corresponding to the funnel shape.
- valve disks 29 are fitted with various valve disks 29 and valve springs 31 .
- common to all the valve disks 29 is that they can be fitted without alignment in the circumferential direction since the through-passages 5 ; 11 are separated by the ridges 7 .
- On side 21 of the damping-valve body at least one valve disk (not shown) covers the encircling annular passage 23 , preventing any short-circuiting of the flow.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fluid-Damping Devices (AREA)
Abstract
Description
- 1. Field of the Invention
- The invention relates to a damping valve of the type having a one piece damping valve body with axial through passages for each direction of flow, a valve disk which at least partially covers outlet openings of through passages on at least one of said sides, and radial inflow openings for through passages.
- 2. Description of the Related Art
- In the case of a damping valve in a piston-cylinder unit, especially a vibration damper, the aim is to make the through-passages or at least the cross sections at the outlet openings as large as possible. The installation space available for the through-passages in the damping-valve body of the damping valve is very limited. This has led to complex solutions that can often only be implemented by sintering if multi-component damping-valve bodies are used.
- U.S. Pat. No. 5,259,294 discloses a sintered piston having two interengaging halves that together define the through-passages. With damping-valve bodies of this kind, there is, on the one hand, a need for complex sintering dies and, on the other hand, there is always the possibility that the damping-valve body will leak between the contact faces of the two halves of the piston. The complex form of the sintering dies is due to the fact that the through-passages have oblique sections.
- An alternative to the oblique through-passages is known from DE 43 43 614 A1. The axially extending through-passages have a radial inflow opening. A significant disadvantage of this damping valve is that the inflow openings have to be machined into the damping-valve body. In this context, attention is also drawn to DE 196 21 639 A1.
- Another possibility for creating large through-passages in a damping valve is known from
DE 27 51 046 A1. The damping valve comprises two piston halves with through-passages for two directions of flow. Arranged on a radially outer pitch circle are axially extending inflow passages, the ends of which are connected to a common nonreturn valve. The nonreturn valve opens a transverse passage that leads to the through-passages with the outlet openings. - DE 40 33 186 A1 describes a restriction device with a bypass circuit dependent on the direction of motion that has axially extending through-passages in conjunction with radial inflow openings. Among the disadvantages of this restriction device is that measures have to be provided to prevent the valve disks sticking on the piston surface, e.g. by roughening the piston surface in the region of the valve disks. The through-passages or at least the outlet openings are furthermore kept relatively small, as a result of which the damping forces of the restriction device are relatively large.
- It is the object of the present invention to obtain a damping valve that has a onepiece damping-valve body that requires little mechanical finish machining, if any, and has all possible fittings as regards its valve disks.
- According to the invention, the outlet openings of the through-passages for a first direction of flow on one side of the damping-valve body have a trapezoidal cross section, and the outlet openings of the through-passages for a second direction of flow on the other side of the damping-valve body open into a common encircling annular channel. The through-passages with outlet openings with the trapezoidal cross section are arranged on a larger pitch circle than the through-passages that open into the annular passage.
- The advantage of the new damping valve lies, on the one hand, in its simple damping-valve body and, on the other hand, in the large areas subjected to pressure on the valve disks. On the one hand, the sum of the trapezoidal cross sections should be regarded as one area subjected to pressure. The annular channel forms the area subjected to pressure for the valve disk for the other direction of flow. The larger pitch circle for the outlet openings of trapezoidal cross section represents a larger lever arm for the pressure acting on the valve disk. The annular passage acting in its entirety as an area subjected to pressure can therefore be made radially further inward and nevertheless produce the desired low damping force.
- In order to minimize the area of contact for the valve disk for the first direction of flow and hence prevent sticking of the valve disk, the radial inflow openings are connected by an encircling channel at their radially inner ends.
- In a further advantageous refinement, the outlet openings of trapezoidal cross section are framed by an encircling ridge, one portion of the encircling ridge bounding the encircling channel. The ridge forms support surfaces for the valve disk for the first direction of flow.
- To achieve as large as possible a cross section for the damping medium flowing into the damping valve, the radial inflow openings are arranged between the outlet openings of trapezoidal cross section, an adjoining portion of the through-passage being embodied as a funnel. The funnel is a shape that is easy to form and allows advantageous deflection of the damping medium from the radial inflow opening into the axial through-passage.
- According to another advantageous embodiment, the funnel of the throughpassage is framed over an arc segment by the encircling ridge of the outlet opening of trapezoidal cross section. The aim of this measure is to achieve as large as possible a funnel opening. For this purpose, it is advisable for the funnel to extend right up to the trapezoidal outlet openings arranged in the circumferential direction and to cancel out the pure trapezoidal shape at said arc segment.
- Other objects and features of the present invention will become apparent from the following detailed description considered in conjunction with the accompanying drawings. It is to be understood, however, that the drawings are designed solely for purposes of illustration and not as a definition of the limits of the invention, for which reference should be made to the appended claims. It should be further understood that the drawings are not necessarily drawn to scale and that, unless otherwise indicated, they are merely intended to conceptually illustrate the structures and procedures described herein.
- FIG. 1 shows a damping-valve body of the damping valve in plan view,
- FIG. 2 shows a damping-valve body in accordance with section A-A,
- FIG. 3 shows a damping-valve body in accordance with section B-B, and
- FIGS. 4a-4 c show a damping valve with various fittings.
- FIG. 1 shows a damping-valve body1, which is produced by a sintering technique and is in one piece. Transverse through-
passages 5 for a first direction of flow are formed on afirst pitch circle 3. The transverse through-passages 5 have a trapezoidal outlet opening. Each outlet opening is framed by anencircling ridge 7. Radially extendinginflow openings 9 for through-passages 11 are formed on asmaller pitch circle 13 between the circumferentially arranged transverse through-passages 5 with the trapezoidal outlet openings. Toward theinflow openings 9, the through-passages 11 have funnels 15 (see FIG. 2), contour lines being provided to make this clear. The inflow openings 9 and hence also the through-passages 11 are connected on oneside 19 of the damping valve by anencircling channel 17. On theopposite side 21 of the damping-valve body, the same through-passages 11 have an encircling annular passage 23 (see FIGS. 2 and 3). Theencircling passage 17 is separated from the through-passages 5 by theridge 7 and is filled with a damping medium. Consequently, only the sum of the end faces of theridge 7 plus anannular clamping surface 25 remain as valve support surfaces. Sticking of a valve disk on the damping-valve body is therefore to be considered to be unlikely. - The
funnels 15 of the through-passages 11 are dimensioned in such a way that they are framed by anarc segment 27 of theridges 7, the trapezoidal outlet openings of the through-passages 5 having an arc corresponding to the funnel shape. - In FIGS. 4a to 4 c, the damping-valve body as depicted in FIG. 2 is fitted with
various valve disks 29 andvalve springs 31. Common to all thevalve disks 29 is that they can be fitted without alignment in the circumferential direction since the through-passages 5; 11 are separated by theridges 7. Onside 21 of the damping-valve body, at least one valve disk (not shown) covers the encirclingannular passage 23, preventing any short-circuiting of the flow. - Thus, while there have shown and described and pointed out fundamental novel features of the invention as applied to a preferred embodiment thereof, it will be understood that various omissions and substitutions and changes in the form and details of the devices illustrated, and in their operation, may be made by those skilled in the art without departing from the spirit of the invention. For example, it is expressly intended that all combinations of those elements and/or method steps which perform substantially the same function in substantially the same way to achieve the same results are within the scope of the invention. Moreover, it should be recognized that structures and/or elements and/or method steps shown and/or described in connection with any disclosed form or embodiment of the invention may be incorporated in any other disclosed or described or suggested form or embodiment as a general matter of design choice. It is the intention, therefore, to be limited only as indicated by the scope of the claims appended hereto.
Claims (5)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10011168 | 2000-03-08 | ||
DE10011168A DE10011168C1 (en) | 2000-03-08 | 2000-03-08 | Damper valve has axial through flow ducts partly covered by valve disc, outlets, feeder opening, funnel, curved section and arm |
DE10011168.8 | 2000-03-08 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20010035212A1 true US20010035212A1 (en) | 2001-11-01 |
US6401755B2 US6401755B2 (en) | 2002-06-11 |
Family
ID=7633892
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/800,686 Expired - Lifetime US6401755B2 (en) | 2000-03-08 | 2001-03-07 | Damping valve |
Country Status (3)
Country | Link |
---|---|
US (1) | US6401755B2 (en) |
DE (1) | DE10011168C1 (en) |
FR (1) | FR2806139B1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2017013766A1 (en) * | 2015-07-22 | 2017-01-26 | Kyb株式会社 | Piston |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004008648B4 (en) * | 2004-02-21 | 2008-08-07 | Zf Friedrichshafen Ag | Valve, in particular damping valve for a vibration damper |
DE102006033378A1 (en) * | 2006-07-19 | 2008-01-31 | Dr.Ing.H.C. F. Porsche Ag | Valve device i.e. non-return valve, for shock absorber of motor vehicle, has valve body completely fitted at one of contact surfaces, when valve device is closed and contact surface partially overlaps and fits at another contact surface |
DE102010062324B4 (en) | 2010-12-02 | 2015-01-29 | Zf Friedrichshafen Ag | Damping valve arrangement for a vibration damper |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2316924A (en) * | 1941-11-12 | 1943-04-20 | Monroe Auto Equipment Co | Hydraulic shock absorder structure |
DE4110023A1 (en) | 1991-03-27 | 1992-10-01 | Ringsdorff Werke Gmbh | SHOCK ABSORBER PISTON FROM UNEQUAL, JOINTED PARTS |
DE1249100B (en) * | 1959-02-17 | 1967-08-31 | ||
CA1058643A (en) * | 1976-03-22 | 1979-07-17 | Dale A. Palmer | Shock absorber |
CA1096410A (en) * | 1977-06-13 | 1981-02-24 | Jan M. A. Wijnhoven | Shock absorber piston |
US4624347A (en) * | 1984-01-23 | 1986-11-25 | Ford Motor Company | Piston assembly for shock absorber |
JPH0231615Y2 (en) * | 1985-12-26 | 1990-08-27 | ||
DE8908341U1 (en) * | 1989-07-08 | 1989-08-31 | Sintermetallwerk Krebsöge GmbH, 42477 Radevormwald | Pistons for vibration dampers, in particular shock absorbers of motor vehicles |
DE4033186A1 (en) * | 1990-10-19 | 1992-04-23 | Stabilus Gmbh | THROTTLE DEVICE WITH DIRECTIONAL BYPASS SWITCHING |
DE4404835A1 (en) * | 1994-02-16 | 1995-08-17 | Fichtel & Sachs Ag Werk Eitorf | Damping valve esp. for oscillation damper |
DE4343614C2 (en) * | 1993-07-13 | 2003-02-13 | Zf Sachs Ag | Piston for a hydraulic telescopic vibration damper |
DE69506148T2 (en) * | 1994-03-07 | 1999-05-06 | Delphi Espana Automotive Sys | Suspension leg |
US5425398A (en) * | 1994-03-28 | 1995-06-20 | General Motors Corporation | Valve for automotive damper |
DE19621639A1 (en) | 1996-05-30 | 1997-07-03 | Fichtel & Sachs Ag | Dampening piston for hydraulic telescopic vibration damper |
DE19819754A1 (en) * | 1998-05-04 | 1999-09-09 | Mannesmann Sachs Ag | Damping piston and cylinder has valve which does not limit |
-
2000
- 2000-03-08 DE DE10011168A patent/DE10011168C1/en not_active Expired - Lifetime
-
2001
- 2001-03-07 US US09/800,686 patent/US6401755B2/en not_active Expired - Lifetime
- 2001-03-08 FR FR0103143A patent/FR2806139B1/en not_active Expired - Fee Related
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2017013766A1 (en) * | 2015-07-22 | 2017-01-26 | Kyb株式会社 | Piston |
JPWO2017013766A1 (en) * | 2015-07-22 | 2018-04-12 | Kyb株式会社 | piston |
Also Published As
Publication number | Publication date |
---|---|
FR2806139B1 (en) | 2006-02-24 |
DE10011168C1 (en) | 2001-09-06 |
US6401755B2 (en) | 2002-06-11 |
FR2806139A1 (en) | 2001-09-14 |
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Owner name: MANNESMANN SACHS AG, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:MOLLER, ROBERT;REEL/FRAME:011926/0695 Effective date: 20010418 |
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