EP3948012A1 - Amortisseur avec butée de fin de course equipée d'un clapet de limitation de pression - Google Patents
Amortisseur avec butée de fin de course equipée d'un clapet de limitation de pressionInfo
- Publication number
- EP3948012A1 EP3948012A1 EP20707731.4A EP20707731A EP3948012A1 EP 3948012 A1 EP3948012 A1 EP 3948012A1 EP 20707731 A EP20707731 A EP 20707731A EP 3948012 A1 EP3948012 A1 EP 3948012A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- stop
- valve
- piston
- shock absorber
- damper
- 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
- 239000012530 fluid Substances 0.000 claims abstract description 12
- 230000006835 compression Effects 0.000 claims abstract description 11
- 238000007906 compression Methods 0.000 claims abstract description 11
- 239000000725 suspension Substances 0.000 claims abstract description 11
- 239000006096 absorbing agent Substances 0.000 claims description 36
- 230000035939 shock Effects 0.000 claims description 36
- 238000013016 damping Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000000750 progressive effect Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
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
- F16F9/48—Arrangements for providing different damping effects at different parts of the stroke
- F16F9/49—Stops limiting fluid passage, e.g. hydraulic stops or elastomeric elements inside the cylinder which contribute to changes in fluid damping
Definitions
- the present invention relates to a hydraulic shock absorber having an end stop, as well as to a motor vehicle equipped with this type of shock absorber.
- Motor vehicles generally include for each wheel a suspension comprising a suspension spring, and a hydraulic telescopic shock absorber which slows down the movements of this suspension.
- the shock absorber may include a hydraulic end stop, which strongly slows down the movement before the end of travel to avoid an impact on a rigid stop.
- a known type of hydraulic adjustable limit stop presented in particular by document US-A-3207270, comprises a rod receiving an axial thrust from a movement to be braked, driving a sliding piston in a cylinder having a series of distributed bores lengthwise.
- a manual control system located outside the cylinder adjusts the closure of these holes in order to adjust the level of braking of the stop.
- a stop known for a vehicle suspension shock absorber comprises a jack rod comprising at its lower end a damping piston to achieve the main damping, extending towards the bottom by a shirt which at the end of the compression stroke is adjusted around an inner stop tube.
- the liner has a series of axially distributed holes, which are closed one after the other when the tube is introduced into this liner in order to increasingly slow down the transfer of fluid from the outer chamber formed around the liner. , to the bedroom in front of the piston inside the tube. Increasingly high braking is obtained from the compression limit switch of the shock absorber.
- a thrust spring disposed below the main piston comes a little before the end of the shock absorber stroke to press on a valve sliding axially in the stop tube which has additional holes at different heights.
- a control chamber arranged in the stop tube below the plug has a limited passage of fluid to the outside in order to slow down the downward movement of this plug under the effect of the thrust spring, and the upward movement of this bushel under the effect of a return spring.
- valve system with its spring is relatively complex to produce, which entails costs.
- the present invention aims in particular to avoid these drawbacks of the prior art. It proposes for this purpose a hydraulic suspension damper comprising a damper piston sliding in an inner tube, which moves during compression of the damper in an axial direction called the forward direction, the damper piston extending through a stop piston returning at the end of the shock absorber stroke into a stop chamber equipped with bores, by pushing the fluid out of this stop chamber to brake the end of travel, this shock absorber being remarkable in that the stop chamber comprises a lateral bore arranged after a predefined stroke of the stop piston in the stop chamber, equipped with a valve for limiting the pressure in this stop chamber.
- shock absorber for a lightly loaded vehicle, during small movements at the start of the end stop with high speeds the valve opens by limiting the pressure in the stop chamber. Once the drilling has been passed, the valve is neutralized, the limit stop works normally.
- the hydraulic shock absorber according to the invention may further include one or more of the following features, which may be combined with one another.
- the valve comprises a ball pushed by a calibration spring to close the lateral bore.
- the valve comprises a sleeve providing external guidance of the ball and of the calibration spring.
- the stopper piston may be an annular piston comprising the bores, fitting around a stopper tube by closing the stopper chamber disposed around this stopper tube.
- valve is advantageously fixed inside the stop tube.
- valve socket can be fixed inside a tubular support fitted in the stop tube.
- the predefined stroke is between 15 and 25mm.
- the shock absorber comprises a valve calibration spring corresponding to an opening pressure of this valve giving a braking force of the stop piston of between 200 and 400daN.
- the shock absorber comprises a valve calibration spring corresponding to an opening pressure of this valve given by a minimum compression speed of between 1.5 and 2.5 m / s.
- the subject of the invention is also a motor vehicle comprising suspension shock absorbers comprising any of the preceding characteristics.
- FIG. 1 shows in axial section the front part of a shock absorber according to the prior art, approaching the end stop;
- FIG. 2 presents this shock absorber according to the prior art in the middle of the end stop
- FIG. 3 shows the front part of a shock absorber according to the invention as it approaches the end stop
- FIG. 4 is a graph showing examples of braking values for this shock absorber.
- FIG. 1 shows a telescopic shock absorber working in compression along a main axis, towards a side called front by convention, indicated by the arrow AV.
- the shock absorber has a cylindrical inner tube 2, containing a piston 4 fixed to the end of a shock absorber rod 20, sliding axially in this body with a seal to define a front chamber 6 and a rear chamber 22.
- the piston 4 has reduced passages for the fluid 8 between the front chamber 6 and the rear chamber 22, which slow down its movement as a function of the direction and of the speed of passage of the fluid linked to the speed of the damper rod 20.
- a compensation chamber forms an annular volume disposed between the inner tube 2 and an outer envelope, not shown, containing a pressurized gas, receiving the fluid discharged by the volume displaced during the entry of the damper rod 20 into the shock absorber when working in compression.
- the piston 4 is extended on the front side by a circular liner 10 which before the end of the stroke fits around an end of stroke stop tube 12, closing an annular outer stop chamber 16 formed around this tube.
- the stop tube 12 defining inside an inner chamber 26, is fixed by its front end to a cover 14 closing the front end of the inner tube 2.
- the sleeve 10 has an outer annular boss 24 guiding it in the inner tube 2, and a series of axially aligned radial bores 18, which in the direction of the front have an increasingly larger diameter.
- Figure 2 shows the advance of the liner 10 in the outer stop chamber 16 around the stop tube 12, the fluid from this outer chamber being pumped towards the inner chamber 26 through the bores 18 of calibrated section to achieve progressive braking of the advance of the rod of the shock absorber 20. The fluid then passes from the inner chamber 26 to the rear volume 22 of the piston 4 through its reduced passages 8.
- the bores 18 of the sleeve 10 gradually close, which increasingly reduces the total section of the passage of the fluid from the stop chamber 16 to the inner chamber 26, and increases the braking force which becomes very important near the end of the stroke.
- FIG. 3 shows a valve 34 fixed inside a tubular support 30 fitted in the stop tube 12, and wedged axially by a rear shoulder 32 bearing on the rear end of this stop tube.
- the valve 34 comprises successively, starting radially from the outside, a radial bore 44 passing through both the stop tube 12 and the tubular support 30, a ball 36, then a calibrating helical spring working in compression 38, pressing on this ball outwards to close the radial hole.
- valve 34 can operate in discharge when the pressure in the stop chamber 16 exceeds a threshold allowing the ball 36 to be moved backwards. compressing the setting spring 38.
- Figure 4 shows the braking force F of the attack stop expressed in daN on the vertical axis, as a function of the stroke C expressed in mm from the start of the end stop, for different movement speeds piston 4 expressed in m / s.
- the preset stroke C0 is 20mm.
- the force F is very weak up to about 35mm of travel of the stop, then rises to about 200daN.
- the force F rises quickly to reach 500daN at 20mm, then ends at around 700daN.
- a speed value between 1.5 and 2.5m / s, and for a 20mm stroke the force F exceeds 300daN which is uncomfortable. This state is obtained, for example, when arriving on a retarder forming a boss on the road, which gives a high compression speed of the shock absorber with a low displacement.
- the pressure-limiting valve 34 can be placed on other types of end-of-stroke stop, comprising for example a stop piston entering a stop tube equipped with bores, to perform the end-of-stroke braking. this stop piston.
- a simple, efficient and economical way is obtained, with a simple valve 34 comprising very few components, an avoidance of the uncomfortable operating zone 52 limited by a predefined maximum stroke CO, and a minimum force FO of in particular between 200 and 400daN.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fluid-Damping Devices (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1903228A FR3094434B1 (fr) | 2019-03-28 | 2019-03-28 | Amortisseur avec butee de fin de course equipee d’un clapet de limitation de pression |
PCT/FR2020/050224 WO2020193883A1 (fr) | 2019-03-28 | 2020-02-10 | Amortisseur avec butee de fin de course equipee d'un clapet de limitation de pression |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3948012A1 true EP3948012A1 (fr) | 2022-02-09 |
Family
ID=67262687
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20707731.4A Pending EP3948012A1 (fr) | 2019-03-28 | 2020-02-10 | Amortisseur avec butée de fin de course equipée d'un clapet de limitation de pression |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3948012A1 (fr) |
CN (1) | CN113646557B (fr) |
FR (1) | FR3094434B1 (fr) |
WO (1) | WO2020193883A1 (fr) |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL132645C (fr) | 1964-08-31 | 1900-01-01 | ||
US4026533A (en) * | 1975-08-29 | 1977-05-31 | Hennells Ransom J | Shock absorber with conical control elements |
DE102010023870A1 (de) * | 2010-06-15 | 2011-02-10 | Daimler Ag | Progressive Gasfederdämpfervorrichtung |
FR3050000B1 (fr) | 2016-04-08 | 2018-09-07 | Peugeot Citroen Automobiles Sa | Amortisseur hydraulique equipe d’une butee d’attaque presentant une loi de freinage reglable |
FR3050496B1 (fr) * | 2016-04-25 | 2018-09-07 | Peugeot Citroen Automobiles Sa | Systeme de suspension hydraulique d'un vehicule |
CN107013623B (zh) * | 2016-05-13 | 2019-01-25 | 北京京西重工有限公司 | 用于车辆的液压阻尼器 |
FR3066796B1 (fr) * | 2017-05-24 | 2019-06-21 | Peugeot Citroen Automobiles Sa | Butee hydraulique auto-ajustable pour la fin de course d’un mouvement oscillant |
-
2019
- 2019-03-28 FR FR1903228A patent/FR3094434B1/fr active Active
-
2020
- 2020-02-10 CN CN202080025424.7A patent/CN113646557B/zh active Active
- 2020-02-10 WO PCT/FR2020/050224 patent/WO2020193883A1/fr unknown
- 2020-02-10 EP EP20707731.4A patent/EP3948012A1/fr active Pending
Also Published As
Publication number | Publication date |
---|---|
WO2020193883A1 (fr) | 2020-10-01 |
FR3094434A1 (fr) | 2020-10-02 |
FR3094434B1 (fr) | 2021-11-19 |
CN113646557A (zh) | 2021-11-12 |
CN113646557B (zh) | 2023-12-01 |
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Legal Events
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Effective date: 20210726 |
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Owner name: STELLANTIS AUTO SAS |