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WO1995011392A1 - Amortisseur - Google Patents

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Publication number
WO1995011392A1
WO1995011392A1 PCT/NZ1994/000117 NZ9400117W WO9511392A1 WO 1995011392 A1 WO1995011392 A1 WO 1995011392A1 NZ 9400117 W NZ9400117 W NZ 9400117W WO 9511392 A1 WO9511392 A1 WO 9511392A1
Authority
WO
WIPO (PCT)
Prior art keywords
shock absorber
piston
piston rod
cylinder
fitting
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.)
Ceased
Application number
PCT/NZ1994/000117
Other languages
English (en)
Inventor
Robert Graham Semmens
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to AU80067/94A priority Critical patent/AU8006794A/en
Publication of WO1995011392A1 publication Critical patent/WO1995011392A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • F16F9/54—Arrangements for attachment
    • 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
    • B60G13/001—Arrangements for attachment of dampers
    • B60G13/005—Arrangements for attachment of dampers characterised by the mounting on the axle or suspension arm of the damper unit
    • B60G13/008—Arrangements for attachment of dampers characterised by the mounting on the axle or suspension arm of the damper unit involving use of an auxiliary cylinder

Definitions

  • This invention relates to shock absorbers and particularly, but not solely, relates
  • This shock absorber consists of a single seamless tube or cylinder containing a
  • piston rod and piston with guide and seal at one end and a floating piston and cylinder end plug at the other.
  • the area between the rod guide and seal and the floating piston contains the piston and is filled with oil.
  • the area between the floating piston and cylinder end plug contains gas under pressure.
  • the piston rod is necessarily kept to as small a diameter as possible to minimize the size of gas chamber required.
  • the piston rod is subject to bending due to small diameter.
  • This shock absorber consists of an inner pressure tube enclosed by a larger outer tube with the area between the tubes being used as an oil reservoir. Fitted inside the inner pressure tube is a piston rod and piston with a rod guide and seal at the upper end and a base and valves at the lower end. As the piston rod and piston move longitudinally in the inner cylinder oil passes through the piston and in and out the base valve.
  • the invention consists in a shock absorber comprising an inner cylinder having a piston rod containing end and a non-piston rod containing end.
  • a first piston is disposed within the inner cylinder and a piston rod is attached to the first piston.
  • the piston rod exits the cylinder from the piston rod containing end and a floating piston
  • the first piston containing compartment contains a liquid
  • the non-piston containing compartment contains a gas under pressure.
  • An outer cylinder is also provided in fluid connection with the non-piston
  • the present invention provides significant advantages over known shock absorbers.
  • the non-piston containing compartment can also contain a liquid as well as the gas.
  • the liquid allows heat transfer to occur, therefore increasing the efficiency of the shock absorber, and can also be used to adjust the volume of gas provided in the outer cylinder so that the change in gas pressure of the outer cylinder as the piston rod enters the inner cylinder can be selected.
  • the first piston has a valve therein for allowing transfer of the liquid from one side of the first piston to the other. This provides a damping or shock absorbing effect, and together with the gas between the floating piston and the outer cylinder allows the shock absorber to also act as a gas spring, so that a separate shock absorber and spring arrangement is not necessary.
  • the inner and outer cylinders are concentric with each other, the walls of the inner cylinder being disposed within the walls of the outer cylinder. This adds to the mechanical strength of the overall construction and also provides the advantage that the outer tube can be damaged, for example by being dented, without preventing the shock absorber from functioning properly.
  • a valve is provided in a wall of the outer cylinder or in the non-piston rod
  • the outer cylinder may also be provided as part of a strut. This allows the shock absorber to be used directly as part of a vehicle suspension system.
  • the invention consists in a shock absorber having at at least one end an attachment fixing fitting which in use enables selected attachments to be fixed to the shock absorber.
  • the attachments are fixed by a complementary attachment fitting to
  • shock absorber to be adapted for use in a variety of motor vehicles.
  • attachments are selected to suit a particular motor vehicle in that series of motor vehicles. This provides the advantage that a single shock absorber may be used in a number of different vehicles so that the stock or inventory which needs to be held by suppliers or distributors is significantly reduced, leading to a corresponding reduction in costs.
  • Each attachment fixing fitting comprises a male or female threaded screw fitting fixed to the shock absorber.
  • the attachments comprise couplings having at one end the complementary attachment fitting to co-act with the attachment fixing fitting on the shock absorber and at the other end a connection for connecting to the shock absorber connection fitting of a motor vehicle.
  • the other end is mounted in a case carrying a wheel stud, a selected one of a plurality of packing pieces being provided, if required, between the other end of the shock absorber and the base of the case.
  • the invention consists in the foregoing and also envisages constructions of which
  • Figure 1 is a diagrammatic cross section of a shock absorber having one form of attachment fixing fitting at each end thereof;
  • FIG. 2 shows a shock absorber having an alternative form of attachment fixing fitting fitted thereto
  • Figures 3 to 6 show different shock absorber attachments suited to particular vehicles and for association with the shock absorber of figure 1;
  • FIGS 7 to 10 show different shock absorber attachments for association with the shock absorber of Figure 2;
  • FIG 11 is a diagrammatic cross section of a shock absorber in the form of a McPHERSON strut;
  • Figure 12 is an elevation in partial cross-section of a shock absorber in accordance with the present invention.
  • Figure 13 is a front elevation in partial cross-section showing a shock absorber of the type shown in figure 12 fitted to a McPHERSON strut.
  • shock absorber The internal operation of the shock absorber is in accordance with known practice
  • the upper end of the piston rod 2 is provided with a male thread 5 and a male threaded member 6 is fixed, for example by welding, to the lower end of the shock
  • the threaded members 5 and 6 provide attachment fixing fittings.
  • piston rod 2 and moving with that piston rod is a dust cover 3 this arrangement being as with the construction in figure 1 but the attachment fixing fitting 10 at the upper end of the piston rod 2 and 11 at the lower end of the shock absorber body 12 are provided with female threads.
  • a ring 15 is provided with a female complementary attachment fitting 16 comprising a female threaded member which engages with the male threaded member 5.
  • the complementary attachment fitting 16 is associated with a male screw 17.
  • the complementary attachment fitting 16 is associated
  • a complementary attachment fixing fitting 20 is associated with the ring 21 in figure 7, with a male threaded member
  • the male complementary fitting 20 is engageable with the female attachment fixing fitting 10 or 11 of figure 2. It will be apparent from the foregoing that the attachment fixing fittings shown in figure 1 and figure 2 are alternatives and generally speaking only one such alternative would be provided.
  • absorbers and attachments can be provided to enable varying motor vehicle requirements to be met. As a consequence of this a stockist may considerably reduce the amount and value of the stock required to be held to enable a demand for a considerable number of specific shock absorber sizes or specifications to be met.
  • the shock absorber 30 has a piston rod 2 extending therefrom which is provided with a interchangeable end piece substantially as previously described.
  • the piston rod 2 may be provided with a female threaded depression at 32 and an interchangeable bearing stud 31 may be provided having a thread at 33 onto which a fitting may be mounted.
  • attachment spacing means are provided including a range of extension members 31 having appropriate threaded portions at each end. The dimension A of each of the extension members 31 varies so as to provide varying lengths.
  • the shock absorber is contained within a case in the form of strut case 34.
  • the strut case 34 may be threaded on its surface at 35 so that a threaded apertured securing cap 36 may be positioned therein if required.
  • the attachment spacing means if required include a plurality of packing pieces 37, a selected one of which is positionable between end 38 of the shock absorber and the end 39 of the strut case 34.
  • a wheel mounting assembly 40 including an axle is provided on the strut case 34.
  • the strut case 34 also carries the spring saddle 41.
  • shock absorber There are generally four or five sizes of telescopic shock absorbers, diameter wise in common use. Taking one size of shock absorber for example, by manufacturing a range of 10 lengths in stages of say 25mm increase would give sufficient range lengthwise to cover most requirements for this size. A selection of three valve setting
  • the required attachment can be readily selected for a required motor vehicle and thus the range of 30 replacement shock absorbers can be magnified many times as compared with the present system where the mountings or attachments are welded in
  • shock absorber with appropriate mountings or attachments would cover the requirements of 100 to 200 different shock absorbers as at present required.
  • production schedules would be simplified and the stock inventory for both manufacturer and distributor would be much lower.
  • shock absorber cartridges of two different diameters for example 38mmOD 3/4 inch piston rod and 41mmOD 7/8 inch piston rod and two or three different lengths. Allowing for five valve setting options for each size means a substantial reduction in the number of cartridges that must be carried in stock. For the manufacturer of cartridges it would mean a greatly reduced stock inventory with long production runs of only a few part numbers. The stock would not
  • a shock absorber in accordance with a preferred embodiment of the present invention is shown generally referenced 50.
  • the shock absorber has an inner cylinder or tube 52 which is concentrically mounted within an outer cylinder or tube 52 which is concentrically mounted within an outer cylinder or tube 52 .
  • the cylinders 52 and 54 have a piston rod guide 56 and top cap 58 at one end thereof which contain a piston rod 60 and through which the piston rod exits the cylinders.
  • the piston rod guide 56 has an O-ring seal 62, sealing the piston rod guide against the inner walls of inner cylinder 52 and an O-ring seal 64 which makes the seal between the piston rod guide and the inner surfaces of outer cylinder 54.
  • the piston rod 60 is longitudinally slidably moveable through aperture 66 in piston rod guide 56.
  • End cap 58 has a thread 68 on the outer edge thereof for attachment to inner surfaces of outer cylinder 54 to aid assembly or disassembly of the shock absorber.
  • the upper edges 70 (as shown by the dashed lines) of outer cylinder 54 may be rolled over the upper edges of the top cap 58 to ensure a good connection. However this makes disassembly more difficult.
  • the end cap 58 has an aperture 72 therein through which piston rod 60 can slidably move in a longitudinal direction and adjacent to aperture 62 a high pressure seal 74 is provided to substantially prevent transfer of liquid or air to or from the cylinders.
  • a cylinder base and valve body 76 is provided at the other end of the cylinders 52 and 54.
  • the cylinder base and valve body has an O-ring seal 78 which provides a seal between the cylinder base and the inner walls of outer cylinder 54.
  • the cylinder base and valve body 76 has a valve member 80 therein and an O-ring seal 82 is provided between the valve member and the cylinder base valve body.
  • a portion of the valve member 80 is provided externally of the cylinder base and valve body and this portion has a thread 84 to provide a mounting stud.
  • the cylinder base and valve body may be fixed to the outer cylinder 54 by rolling the ends 86 of cylinder
  • a first piston 88 is provided on an end of the piston rod 60, the piston preferably having a seal 90 about the outer edges thereof to make sealing contact with inner surfaces of the walls of the inner cylinder 52. Piston 88 also has apertures 92
  • plate springs 94 either side of the apertures which provide compression valves
  • a floating piston 98 is provided having a seal 100 and is provided between piston 88 and cylinder base 76 to effectively divide the inner cylinder into two compartments, a first piston containing compartment containing piston 88, piston rod 60 and a liquid such as
  • Apertures or ports 104 are provided in the base of inner cylinder 52 so that gas from compartment 102 is free to pass between compartment 102 and annular space 106 between the inner and outer cylinders.
  • the annular space 106 between the two cylinders provides a gas storage reservoir. Although, if desired, some liquid such as oil may be added to the space 106 between the two cylinders.
  • the level of the oil present is indicated by dashed lines 107.
  • the provision of liquid or oil between the cylinders also allows the volume of gas provided in the outer chamber to be selected so that the increase or rate of increase of pressure in the outer cylinder as the piston rod
  • edges 70 enable easy assembly and disassembly.
  • the following advantages can be identified in the shock absorber described with reference to figure 12;
  • the floating piston may travel to the very bottom of the cylinder, giving full stroke to the piston.
  • shock absorbers which have a floating piston a pocket of gas must always be present between floating piston and the cylinder base unless a
  • a heavy duty piston rod may be used, to provide greater strength and optional gas lift.
  • the heavy duty piston rod would have a greater diameter, and this diameter can be accommodated in the shock absorber of figure 12 because the increased liquid or oil displacement of the larger piston rod can be accommodated by the large volume of gasses
  • the gas pressure can be increased to provide a gas spring effect acting on the piston rod to provide lift to assist the vehicle springs.
  • the gas spring effect can be used to provide total vehicle support without
  • shock absorber illustrated in figure 12 lends itself to the construction of a range of shock absorbers of all sizes, for vehicle suspensions, McPHERSON strut cartridges, steering dampers, industrial dampers etc.
  • the shock absorber shown in figure 12 can be used within a standard McPHERSON strut and interchangeable
  • a shock absorber substantially the same as the shock absorber described with reference to figure 12 is shown fitted to a McPHERSON strut.
  • the reference numerals used in figure 13 for features which are common to shock absorbers shown in figures 12 and 13 are the same, and the general operation of these shock absorbers is the same.
  • the outer tube or cylinder 54 comprises part of the McPHERSON strut in that the axle 106 and the spring collar 108 are provided directly attached to cylinder 54.
  • the gas ports 104 are provided in the cylinder base and the gassing valve 80, rather than being provided within the cylinder base, is provided in a wall of cylinder 54.
  • a piston rod stop 110 is provided to limit the upward movement of the piston. It will also be seen that the piston rod attachments and base packers described with reference to figures 1 to 11 could also be used in the shock absorber arrangement depicted in figure 13.

Landscapes

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

Abstract

Un amortisseur (50) télescopique comprend un cylindre (52) interne et un cylindre (54) externe concentriques. Le cylindre (52) interne comporte un piston (88), fixé à une tige (60) de piston, ainsi qu'un autre piston (98) flottant qui sépare ce cylindre interne en deux compartiments dont l'un contient un fluide hydraulique et l'autre un gaz. Le piston fixé à la tige de piston se trouve dans le compartiment hydraulique. Le compartiment (102) à gaz se trouve en communication fluidique avec l'espace (106), séparant les cylindres internes et externes, qui constitue un réservoir de gaz. On décrit aussi un amortisseur dont les dispositifs de montage permettent de le monter sur des véhicules très différents.
PCT/NZ1994/000117 1993-10-22 1994-10-25 Amortisseur Ceased WO1995011392A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU80067/94A AU8006794A (en) 1993-10-22 1994-10-25 Shock absorbers

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NZ250028 1993-10-22
NZ25002893 1993-10-22

Publications (1)

Publication Number Publication Date
WO1995011392A1 true WO1995011392A1 (fr) 1995-04-27

Family

ID=19924543

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NZ1994/000117 Ceased WO1995011392A1 (fr) 1993-10-22 1994-10-25 Amortisseur

Country Status (2)

Country Link
AU (1) AU8006794A (fr)
WO (1) WO1995011392A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012009220A1 (de) * 2012-04-28 2013-10-31 Audi Ag Schwingungsdämpfer für ein Fahrzeug
CN106438813A (zh) * 2016-11-09 2017-02-22 合肥江瑞汽车零部件有限公司 一种车辆减震器
CN108498062A (zh) * 2018-04-26 2018-09-07 郑由周 肠镜球囊
US10598246B2 (en) 2017-06-06 2020-03-24 Reyco Granning, Llc Strut assembly with combined gas spring and damper
GB2627290A (en) * 2023-02-20 2024-08-21 Bae Systems Plc Double acting cyinder assembly

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3679029A (en) * 1971-04-21 1972-07-25 James H Thomas Shock absorber extension
US3804443A (en) * 1970-12-26 1974-04-16 Nissan Motor Impact absorbing device using compressible liquid
GB1364202A (en) * 1971-01-11 1974-08-21 Largay J A Shock absorbers
GB1499396A (en) * 1975-04-19 1978-02-01 Tokico Ltd Shock absorber
AU3323484A (en) * 1983-09-26 1985-06-06 Nhk Spring Co. Ltd. Vehicle hydropneumatic suspension
US5137124A (en) * 1989-09-21 1992-08-11 Stabilus Gmbh Pressure tube piston unit

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3804443A (en) * 1970-12-26 1974-04-16 Nissan Motor Impact absorbing device using compressible liquid
GB1364202A (en) * 1971-01-11 1974-08-21 Largay J A Shock absorbers
US3679029A (en) * 1971-04-21 1972-07-25 James H Thomas Shock absorber extension
GB1499396A (en) * 1975-04-19 1978-02-01 Tokico Ltd Shock absorber
AU3323484A (en) * 1983-09-26 1985-06-06 Nhk Spring Co. Ltd. Vehicle hydropneumatic suspension
US5137124A (en) * 1989-09-21 1992-08-11 Stabilus Gmbh Pressure tube piston unit

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012009220A1 (de) * 2012-04-28 2013-10-31 Audi Ag Schwingungsdämpfer für ein Fahrzeug
CN106438813A (zh) * 2016-11-09 2017-02-22 合肥江瑞汽车零部件有限公司 一种车辆减震器
US10598246B2 (en) 2017-06-06 2020-03-24 Reyco Granning, Llc Strut assembly with combined gas spring and damper
CN108498062A (zh) * 2018-04-26 2018-09-07 郑由周 肠镜球囊
CN108498062B (zh) * 2018-04-26 2024-03-22 郑由周 肠镜球囊
GB2627290A (en) * 2023-02-20 2024-08-21 Bae Systems Plc Double acting cyinder assembly

Also Published As

Publication number Publication date
AU8006794A (en) 1995-05-08

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