EP3899315A1 - Hydraulic shock absorber with temporary inertia deactivation - Google Patents
Hydraulic shock absorber with temporary inertia deactivationInfo
- Publication number
- EP3899315A1 EP3899315A1 EP19868203.1A EP19868203A EP3899315A1 EP 3899315 A1 EP3899315 A1 EP 3899315A1 EP 19868203 A EP19868203 A EP 19868203A EP 3899315 A1 EP3899315 A1 EP 3899315A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- axial rod
- hydraulic damper
- orifice
- shutter
- inertia
- 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.)
- Withdrawn
Links
- 239000006096 absorbing agent Substances 0.000 title claims abstract description 47
- 230000035939 shock Effects 0.000 title claims abstract description 47
- 230000009849 deactivation Effects 0.000 title description 8
- 239000012530 fluid Substances 0.000 claims abstract description 27
- 239000000725 suspension Substances 0.000 claims abstract description 16
- 238000013016 damping Methods 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 230000005764 inhibitory process Effects 0.000 description 5
- 230000010355 oscillation Effects 0.000 description 5
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000009931 harmful effect Effects 0.000 description 3
- 230000000670 limiting effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000003068 static effect Effects 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
- F16F9/50—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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G13/00—Resilient suspensions characterised by arrangement, location or type of vibration dampers
- B60G13/16—Resilient suspensions characterised by arrangement, location or type of vibration dampers having dynamic absorbers as main damping means, i.e. spring-mass system vibrating out of phase
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
- B60G17/06—Characteristics of dampers, e.g. mechanical dampers
- B60G17/08—Characteristics of fluid dampers
-
- 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
- F16F7/00—Vibration-dampers; Shock-absorbers
- F16F7/10—Vibration-dampers; Shock-absorbers using inertia effect
- F16F7/1034—Vibration-dampers; Shock-absorbers using inertia effect of movement of a liquid
-
- 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
- F16F9/182—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 comprising a hollow piston rod
-
- 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
- F16F9/20—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 the piston-rod extending through both ends of the cylinder, e.g. constant-volume dampers
-
- 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
- F16F9/504—Inertia, i.e. acceleration,-sensitive means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2300/00—Indexing codes relating to the type of vehicle
- B60G2300/10—Railway vehicles
-
- 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
- F16F2222/08—Inertia
-
- 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
- F16F2228/04—Frequency effects
-
- 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
Definitions
- the present invention relates to a hydraulic shock absorber with temporary deactivation of inertia as a function of the frequency applied to the hydraulic shock absorber, in particular for a wheel shock absorber in a motor vehicle during a high frequency wheel rebound.
- Motor vehicles have on each wheel a shock absorber arranged in parallel with a suspension spring, which slows the movement of the suspension in order to ensure comfort and handling.
- Hydraulic shock absorbers are often used comprising a rod linked to a piston moving in a cylinder delimiting two chambers, with a limitation of the passages of the fluid from one chamber to the other in order to slow down the movements of this rod.
- the intensity of braking of the suspension movement represents a compromise responding to different constraints.
- a known type of damper presented in particular by document US-A1-20130037362, comprises an inertia system comprising a column of fluid connecting the two chambers arranged on each side of the piston.
- the column of fluid wound around the body of the shock absorber has a reduced section and a length large enough to contain a mass of fluid set in motion with high speed by the movement of the suspension, which artificially adds inertia to the body during its movements braking low frequency oscillations.
- shock absorber presented in particular by document CN-A-105276060, comprises a helical column of fluid which is arranged around or next to the body of the shock absorber.
- the column of fluid disposed outside the body of the shock absorber, adds a mass which it is sought to reduce in order to reduce the consumption of the vehicle, and a volume which is not not always available in the suspension environment.
- a fictitious added mass is visible at the body pumping frequency, which is approximately 1 to 1.5 Hertz, which is desired.
- the problem underlying the invention is, for an inertial hydraulic damper, to temporarily suspend the hydraulic inertia delivered by this hydraulic damper at predetermined frequencies for which it is recognized that maintaining the inertia of the shock absorber is very harmful.
- the present invention relates to a hydraulic shock absorber for the suspension of a motor vehicle comprising a cylindrical body containing a piston fixed to an axial rod. sliding, delimiting in this body two chambers which are connected by a column of inertia fluid opening into each chamber by a respective first or second orifice disposed laterally on the axial rod, characterized in that the column of inertia fluid is formed at the inside the axial rod and that the piston is connected to a shutter by a spring, a mass of the shutter and a spring return constant being calibrated so that the shutter temporarily and at least partially closes the first orifice at a predetermined frequency applied to the damper.
- the invention proposes a device for deactivating the hydraulic inertia of a shock absorber, this as a function of the frequency.
- the technical effect thus obtained is to have a maximum inertia on the mode that one wishes to amortize, mainly the body mode for a hydraulic wheel suspension damper in a motor vehicle and minimal on the other frequencies, in particular on a frequency band which corresponds to the wheel rebound associated with the shock absorber.
- the present invention combines with interactive effect and synergy a technology of a hydraulic column in the rod with such a deactivation device, which provides a great synergy.
- an inertial hydraulic shock absorber adds a fictitious mass to the body of the vehicle seen by the suspension reducing the natural frequency of oscillation of this body with, however, the detriment of having too much inertia during a wheel rebound.
- the deactivation device formed by a shutter connected to the piston by a spring is very simple in design and very compact in size and can very well be integrated into an inertial damper, this without requiring any specific adaptation which may involve a reconfiguration of 1 shock absorber.
- the predetermined frequency corresponds to the rebound frequency of a wheel of the motor vehicle associated with the hydraulic damper.
- the rebound frequency is corrected as a function of an inertia supply provided by the hydraulic damper.
- the inertia column is formed by axial channels arranged along the rod, the axial channels being arranged in series, each successively forming a return or a return along the axial rod.
- the two chambers are superimposed vertically in the mounted position of the hydraulic damper on the motor vehicle, respectively forming an upper chamber and a lower chamber, the first orifice being that of the upper chamber.
- the first orifice opens into the first channel extending to a longitudinal end of the rod, the first channel being extended by a second channel to the other longitudinal end of the axial rod, the second channel being extended through a third channel to the second orifice.
- shock absorber is that the column of fluid formed inside the axial rod, which may have several back and forth along this rod in order to increase its length, uses a space inside the shock absorber . We avoid taking a volume outside the body of the shock absorber to make the column, without equipment additional exterior and the mass of the shock absorber and its cost are little increased.
- a compact hydraulic shock absorber is thus obtained which adds a fictitious mass seen by the suspension to the vehicle body, reducing the natural frequency of oscillation of this body.
- the piston and the shutter comprise dynamic sealing means with respect to an internal wall of the cylindrical body.
- an external contour of the sliding axial rod carries a stop against a movement of the shutter away from the orifice associated with the shutter, the stop being arranged on the side of a face of the shutter opposite to the piston.
- the piston comprises at least one bore allowing communication between the two chambers, said at least one bore comprising a damping device by restriction of the valve, diaphragm or any other dissipation damping technology allowing free passage of the fluid. from the upper chamber to the lower chamber and a braked passage in an opposite direction.
- the rod exits outward axially to the hydraulic damper at each longitudinal end of the cylindrical body of the damper.
- the invention also relates to a motor vehicle fitted with suspension dampers on running gear, each suspension damper being as previously described.
- FIG. 1 is a diagram in axial section of a hydraulic shock absorber according to the invention, presented in a middle position corresponding to a relatively low frequency, for example of the order of 2 Hertz, a spring of a shutter of an orifice of the axial rod pushing the shutter against a stop away from the piston,
- FIG. 2 shows the damper shown in Figure 1 when working in compression at a relatively low frequency, for example of the order of 2 Hertz, the axial rod having protruded from the hydraulic damper that in FIG. 1 and the upper chamber having decreased in volume,
- FIG. 3 is a diagram in axial section of a hydraulic shock absorber according to the invention subjected to a predetermined frequency for which a suspension or temporary inhibition of the inertia provided by the shock absorber is required, this at a relatively frequent strong, for example of the order of 4 Hertz or more, with temporary inhibition of inertia,
- FIG. 4 shows the shock absorber shown in Figure 3 during further compression work
- FIG. 5 shows a comparison of two curves of an inertial hydraulic damper according to the state of the art and an inertial hydraulic damper according to the present invention with inhibition of inertia for a specific range of frequencies, a inertial peak as a function of the predetermined frequencies requiring inhibition of the inertia not being visible in this FIG. 5 on the curve of the damper according to the present invention but being so on the curve of the damper according to the state of the technique.
- Figures 1 to 4 show a shock absorber comprising a tubular main body 2 elongated along a vertical axis in the figures, comprising an axial rod 4 exiting at the two longitudinal ends of this body 2.
- the piston 6 delimits a lower chamber 8 and an upper, lower and upper chamber 10 corresponding to their respective position when the damper is in the mounted position being associated with a wheel of a motor vehicle resting on a horizontal plane.
- the axial rod 4 extending axially at the two longitudinal ends of the body 2 makes it possible to obtain an identical volume variation between the two chambers 8, 10 during the movements of the piston 6, which avoids the installation of a complementary system compensating for a difference variation of these volumes, necessary in the case where the axial rod leaves only on one side.
- the body 2 of the shock absorber can be fixed to the vehicle body and the axial rod 4 to an element of the suspension. Alternatively, one can reverse these two fixings.
- the shock absorber shown in the figures in a vertical position can take all the inclinations in the vehicle.
- the axial rod 4 comprises a little above the piston 6 a first orifice 12 opening laterally into an inner column 14 formed along this axial rod.
- the axial rod 4 also has a second orifice 16 opening laterally into an inner column or column of inertia fluid 14 formed inside and along this axial rod 4, the second orifice 16 opening laterally advantageously in a direction opposite to the outlet of the first orifice 12.
- Such an inertial damper is capable of generating inertia from a volume of displaced fluid.
- a shutter 21 of the first orifice 12 is used with a mass of the shutter 21 controlling the closing of the first orifice 12 to inhibit the inertial system of the shock absorber.
- the piston 6 is connected to a shutter 21 by a spring 22.
- a mass of the shutter 21 and a return constant of the spring 22 are calibrated so that the shutter 21 temporarily closes the first orifice 12 in l obstructing at least partially at a predetermined frequency applied to the damper.
- the shutter 21 may be on one side of the first orifice 12 opposite to that on which the piston is located
- the shutter 21 is disposed by sliding on the axial rod and fixed to the piston 6 by a spring 22.
- the mass of the shutter 21 is calibrated to close the first orifice 12 for a frequency predetermined, for example a frequency of wheel rebound around 15 Hertz.
- the shutter 21 is therefore fixed on the low frequencies, for example between 0 and 4 Hertz.
- the first orifice 12 is then free and the damper can have hydraulic inertia.
- the shutter 21 moves and then closes the first orifice 12 making the inertia fluid inactive.
- the predetermined frequency corresponds to the rebound frequency of a wheel of the motor vehicle associated with the hydraulic damper, for example 15 Hertz but this frequency may have been modified by the shock absorber and lowered to 4 Hertz, due to an inertia supply provided by the hydraulic shock absorber.
- the shutter 21 On low frequencies, for example less than 2 Hertz, the shutter 21 is below its proper mode and therefore inactive. The shutter 21 then follows the movement of the axial rod and a circuit internal to the axial rod is open, which activates the fluid inertia system of the damper. This is shown in Figures 1 and 2.
- the shutter 21 is around its natural frequency therefore active when the first orifice 12 is at least partially closed.
- the shutter 21 then moves relative to the axial rod and independently of the axial rod 4. By this movement,
- closure of the first orifice 12 by the shutter 21 is not permanent and even complete but suffices to make the inertia fluid sufficiently negligible not to be stressed by the rebound of the wheel.
- the shutter 21 may include dynamic sealing means 18 relative to an internal wall of the cylindrical body 2.
- An external contour of the sliding axial rod 4 can carry a stop 23 against a movement of the shutter 21 away from the orifice associated with the shutter 21, the stop 23 being disposed on the side of a face of the shutter 21 opposite piston 6.
- the piston 6 present in the hydraulic shock absorber is rigidly connected to the axial rod 4.
- the piston 6 can comprise at least one bore 20 allowing communication between the two chambers 8, 10.
- the hole (s) 20 can comprise a damping device by restriction of the valve, diaphragm or any other dissipation damping technology allowing free passage of the fluid from the upper chamber to the lower chamber and a braked passage in an opposite direction. .
- the piston 6 has two holes 20 but this is not limiting.
- the axial rod 4 can extend outward axially to the hydraulic shock absorber at each longitudinal end of the cylindrical body 2 of the shock absorber, thus being open on both sides of the hydraulic shock absorber so as not to have to manage compensation.
- the first orifice 12 can be obstructed by the shutter 21 in the hydraulic shock absorber.
- the inner column or inertia column 14, formed along this axial rod 4, can accommodate axial channels 14a, 14b, 14c arranged along the axial rod 4.
- the axial channels 14a, 14b, 14c can be arranged in series, each successively forming a return or a return along the axial rod 4.
- an inertial axial column 14 is obtained, formed by three successive channels 14a, 14b, 14c, having a total length slightly greater than twice the length of the axial rod 4.
- an inertia column 14 is obtained, comprising generally over its entire length a surface of constant section, with the exception of the zones d end forming the connection between two channels where the fluid changes direction.
- a greater number of channels can be formed than three channels, each constituting a return trip along the length of the axial rod 4, to increase the length of the inertia column 14.
- the two chambers 8, 10 can be superimposed vertically in the mounted position of the hydraulic damper on the motor vehicle, respectively forming an upper chamber 10 and a lower chamber 8, the first orifice 12 being that of the upper chamber 10.
- the first orifice 12 can open into the first channel 14a extending to a longitudinal end of the axial rod 4, the first channel 14a being extended by a second channel 14b to the other longitudinal end of the axial rod 4 , the second channel 14b being extended by a third channel 14c up to the second orifice 16.
- the piston 6 compresses the fluid of the upper chamber 10, by pushing it through the first orifice 12 through successively the first channel 14a turned downwards, then the second channel 14b turned upwards, and finally the third channel 14c facing downwards, opening out through the second orifice 16 in the lower chamber 8. This is inhibited during the movement of the shutter 21 opposite the first orifice 12.
- the valve slightly brakes the passage of the fluid towards the upper chamber 10, giving a flow rate adding to that of the inertia column 14, which facilitates the rise of the axial rod 4 during work in compression of one damper.
- FIG. 5 shows two curves giving a power of inertia PI delivered by the hydraulic damper as a function of a frequency F.
- the curve in solid line is obtained by the implementation of the present invention while the curve in dotted lines is obtained for a hydraulic shock absorber according to the state of the art.
- peaks of inertia level are visible, each reaching a graduation of 1.4, including a desired first peak at a frequency of approximately 1 Hertz and covered by the first peak obtained according to a hydraulic damper in accordance with the present invention, deactivation of the inertia not having been implemented for this frequency.
- This first desired peak corresponds to the frequency of the body pumping.
- the second peak of the same magnitude or of a slightly greater magnitude, only recognizable on the dotted curve relating to a hydraulic damper according to the state of the technique, occurs around 3.5 Hertz and relates to a wheel rebound whose frequency has been corrected.
- This second peak is not present on the solid line curve relating to a hydraulic damper according to the present invention, which shows the effect of the inhibition of the inertia produced by the at least partial closure of the first orifice 12 by the shutter 21.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fluid-Damping Devices (AREA)
- Vehicle Body Suspensions (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1873507A FR3090781B1 (en) | 2018-12-20 | 2018-12-20 | Hydraulic shock absorber with temporary inertia deactivation |
PCT/FR2019/052873 WO2020128192A1 (en) | 2018-12-20 | 2019-12-02 | Hydraulic shock absorber with temporary inertia deactivation |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3899315A1 true EP3899315A1 (en) | 2021-10-27 |
Family
ID=66676714
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19868203.1A Withdrawn EP3899315A1 (en) | 2018-12-20 | 2019-12-02 | Hydraulic shock absorber with temporary inertia deactivation |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3899315A1 (en) |
FR (1) | FR3090781B1 (en) |
WO (1) | WO2020128192A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2742448B2 (en) * | 2018-08-14 | 2021-11-03 | Garcia Jasiel Najera | Shock absorber with load regulation depending on the frequency by means of hydraulic inertia |
FR3120408B1 (en) * | 2021-03-08 | 2023-01-20 | Psa Automobiles Sa | MOTOR VEHICLE SUSPENSION HYDRAULIC SHOCK ABSORBER |
CN113236700A (en) * | 2021-04-27 | 2021-08-10 | 南京信息职业技术学院 | Damping device suitable for new energy automobile |
FR3123402B1 (en) * | 2021-05-28 | 2023-07-14 | Psa Automobiles Sa | MOTOR VEHICLE SUSPENSION SHOCK ABSORBER WITH INERTIAL BRAKING |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1364982A (en) * | 1963-07-18 | 1964-06-26 | Kayaba Industry Co Ltd | Damper |
FR1446604A (en) * | 1964-09-08 | 1966-07-22 | Girling Ltd | Improvements to hydraulic vehicle suspension shock absorbers |
US3570635A (en) * | 1967-12-11 | 1971-03-16 | Tatsuya Takagi | Oil-type vibration damper |
JPS5997336A (en) * | 1982-11-22 | 1984-06-05 | Kayaba Ind Co Ltd | Hydraulic buffer |
JPS5999135A (en) * | 1982-11-29 | 1984-06-07 | Kayaba Ind Co Ltd | Hydraulic shock absorber |
JPS59106733A (en) * | 1982-12-07 | 1984-06-20 | Kayaba Ind Co Ltd | Oil-hydraulic damper |
US7216747B2 (en) * | 2004-10-14 | 2007-05-15 | Tenneco Automotive Operating Company Inc. | Amplitude controlled orifice valving |
JP5368917B2 (en) * | 2009-09-10 | 2013-12-18 | カヤバ工業株式会社 | Damping valve |
JP5747045B2 (en) | 2010-02-05 | 2015-07-08 | ケンブリッジ・エンタープライズ・リミテッドCambridge Enterprise Limited | Damping and inertia hydraulic system |
CN105276060B (en) | 2015-11-10 | 2017-12-05 | 江苏大学 | A kind of dual circuit liquid of variable used matter coefficient is used to container |
-
2018
- 2018-12-20 FR FR1873507A patent/FR3090781B1/en active Active
-
2019
- 2019-12-02 EP EP19868203.1A patent/EP3899315A1/en not_active Withdrawn
- 2019-12-02 WO PCT/FR2019/052873 patent/WO2020128192A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
WO2020128192A1 (en) | 2020-06-25 |
FR3090781A1 (en) | 2020-06-26 |
FR3090781B1 (en) | 2021-04-16 |
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