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WO1998003360A1 - Amortisseur a debattement etendu - Google Patents

Amortisseur a debattement etendu Download PDF

Info

Publication number
WO1998003360A1
WO1998003360A1 PCT/GB1996/001774 GB9601774W WO9803360A1 WO 1998003360 A1 WO1998003360 A1 WO 1998003360A1 GB 9601774 W GB9601774 W GB 9601774W WO 9803360 A1 WO9803360 A1 WO 9803360A1
Authority
WO
WIPO (PCT)
Prior art keywords
cylinder
bearings
damper
intermediate tube
piston rod
Prior art date
Application number
PCT/GB1996/001774
Other languages
English (en)
Inventor
Richard Franklin Anderson Anderson
Original Assignee
Pilot Precision Dampers Limited
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 Pilot Precision Dampers Limited filed Critical Pilot Precision Dampers Limited
Priority to PCT/GB1996/001774 priority Critical patent/WO1998003360A1/fr
Priority to EP96925035A priority patent/EP0914491A1/fr
Priority to JP10506669A priority patent/JP2000515614A/ja
Publication of WO1998003360A1 publication Critical patent/WO1998003360A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G3/00—Resilient suspensions for a single wheel
    • B60G3/01—Resilient suspensions for a single wheel the wheel being mounted for sliding movement, e.g. in or on a vertical guide
    • 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
    • B60G13/02—Resilient suspensions characterised by arrangement, location or type of vibration dampers having dampers dissipating energy, e.g. frictionally
    • B60G13/06—Resilient suspensions characterised by arrangement, location or type of vibration dampers having dampers dissipating energy, e.g. frictionally of fluid type
    • B60G13/08—Resilient suspensions characterised by arrangement, location or type of vibration dampers having dampers dissipating energy, e.g. frictionally of fluid type hydraulic
    • 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
    • F16F9/02—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum
    • F16F9/0209—Telescopic
    • 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
    • F16F9/06—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and 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
    • F16F9/32—Details
    • F16F9/3207—Constructional features
    • F16F9/3235—Constructional features of cylinders

Definitions

  • the invention relates to the field of dampers using a fluid as a damping medium. It has particular application to a damper used as a strut for a motor vehicle.
  • Figure 1 illustrates a known damper including a piston rod 2 slidably received in a cylinder 4 containing a fluid damping medium 5.
  • a piston (not shown) is mounted on the piston rod 2 within the cylinder 4 so that movement of the piston along the cylinder 4 is resisted by the damping fluid 5.
  • the cylinder 4 may be connected via a hose 6 to a reservoir (not shown) containing damping fluid and a pressurized gas compartment separated from the fluid by a floating piston.
  • a reservoir allows for the displacement of fluid 5 from the cylinder 4 as the piston rod 2 is inserted and increases the volume of damping fluid available for the dissipation of energy.
  • the illustrated damper is in the form of a MacPherson strut, which is a load-bearing member associated with the front or rear wheel of a vehicle.
  • the strut may include means 8 for mounting a suspension spring, means 10 for attaching the strut to the body of the vehicle and means (not shown) for attaching the strut to the vehicle wheel, hub assembly or upright .
  • a strut case 14 attached to the piston rod 2 surrounds and supports the cylinder 4.
  • the strut case 14 slides over an outer surface 15 of the cylinder 4 on two or more bearings 16.
  • a space 18 which may be filled by a lubricant, typically grease.
  • both bearings 16 are formed on an inner surface of the strut case 14 so that the spacing between them is fixed.
  • one bearing may be formed on the outer surface of the cylinder 4, in which case the spacing between the bearings 16 will vary as the piston moves.
  • the arrangement in which the vehicle body attachment 10 is on the damper cylinder 4, the vehicle wheel attachment is on the strut case 14 and the working piston acts directly on the bore of the cylinder 4 is known as an inverted monotube acPherson strut .
  • damper illustrated for example in patent application EP-A-0607545 , is a non- inverted monotube. It comprises an inner cylinder in which a piston rod is slidably received and an outer cylinder surrounding the inner cylinder to form an annular chamber. A further, annular piston is coupled to the piston rod and slidably received in the annular chamber.
  • the overall length of the strut in the rest position is determined by the vehicle design. Within that constraint, it is desirable to achieve the maximum travel distance of the damper so that the damper can accommodate large displacements of the piston rod 2 away from its rest position.
  • the maximum extension of the damper is limited by the spacing of the bearings 16.
  • the two bearings 16 must be at least a minimum distance apart for two reasons. The first reason is to maintain the rigidity of the strut under bending loads at maximum extension by providing sufficient overlap between the strut case 14 and the outer surface 15 of the cylinder 4. The second reason is to allow a sufficient volume of lubricant in the space 18 between the bearings 16.
  • the invention provides a damper comprising: a cylinder having an outer surface,- a piston rod slidably received in the cylinder,- a case attached to the piston rod and cooperating with the outer surface of the cylinder to maintain the alignment of the piston rod with the cylinder,- CHARACTERIZED IN THAT: an intermediate tube is located between the cylinder and the case such that an inner surface of the intermediate tube engages the outer surface of the cylinder and an inner surface of the case engages an outer surface of the intermediate tube.
  • the intermediate tube allows the damper to be extended in a telescopic manner such that there is very little overlap between the case and the cylinder but there is sufficient overlap between the case and the intermediate tube and between the intermediate tube and the cylinder for the damper to remain sufficiently rigid.
  • the maximum travel distance of the damper according to the invention is greater than in the prior art.
  • the inner surface of the intermediate tube includes a first pair of bearings for engagement with the outer surface of the cylinder, wherein one bearing of the first pair of bearings is formed at an end of the inner surface of the intermediate tube remote from the piston rod and the other bearing of the first pair of bearings is formed at a fixed distance away along the inner surface of the intermediate tube,- and the inner surface of the case includes a second pair of bearings for engagement with the outer surface of the intermediate tube, wherein one bearing of the second pair of bearings is formed at an end of the inner surface of the case remote from the point of attachment between the case and the piston rod and the other bearing of the second pair of bearings is formed at a fixed distance away along the inner surface of the case.
  • the invention may be adapted for application to a monotube or a twin tube damper, inverted or non- inverted, with or without a separate fluid/gas reservoir. It can also be applied to the aforementioned arrangement in which an outer cylinder defines an annular chamber containing an annular piston coupled to the piston rod.
  • the intermediate tube is located concentrically between the annular piston and the inner cylinder or between the annular piston and the outer cylinder so as to be capable of sliding motion relative to the annular piston and relative to the inner or outer cylinder.
  • the invention is also applicable to arrangements wherein one or more of the bearings is formed on the outer surface of the cylinder or of the intermediate tube.
  • Figure 1 illustrates a damper according to the prior art, partially cut away.
  • Figure 2 illustrates a damper according to the invention, partially cut away.
  • the damper according to the invention differs from the prior art in having an intermediate tube 20 located concentrically between the cylinder 4 and the strut case 14.
  • a first pair of bearings 16a is located on an inner surface of the intermediate tube 20 in contact with the outer surface 15 of the cylinder 4, one of the bearings 16a being located near one end of the inner surface of the intermediate tube 20 and the other of the bearings 16a being located a fixed distance away along the inner surface of the intermediate tube 20.
  • a second pair of bearings 16b is located on an inner surface of the strut case 14 in contact with an outer surface 22 of the intermediate tube 20, one of the bearings 16b being located near the end of the inner surface of the strut case 14 remote from its attachment 12 to the piston rod 2 and the other bearing 16b being located a fixed distance away along the inner surface of the strut case 14.
  • a first lubricant space 18a is formed between the first pair of bearings 16a and a second lubricant space 18b is formed between the second pair of bearings 16b.
  • the intermediate tube 20 slides over the outer surface 15 of the cylinder 4 on the first pair of bearings 16a and the strut case 14 slides over the outer surface 22 of the intermediate tube 20 on the second pair of bearings 16b.
  • the intermediate tube 20 slides freely between the cylinder 4 and the strut case 14, its position being constrained only by an outer lip 24 on the intermediate tube 20 that prevents the end of the tube 20 that carries the lip 24 from sliding past the second pair of bearings 16b.
  • a similar outer lip 26 is formed on the cylinder 4 to prevent the end of the cylinder 4 that carries the lip 26 from sliding past the first pair of bearings 16a.
  • Figure 2 shows how the presence of the intermediate tube 20 enables the damper to achieve increased maximum extension, represented by additional travel distance d, when compared with the prior art .
  • the intermediate tube 20 allows the first and second pairs of bearings 16a, b to slide almost past each other so that there is very little overlap between the cylinder 4 and the strut case 14. Meanwhile, the intermediate tube 20 maintains the rigidity of the strut under bending loads .
  • each pair of bearings 16a, b may be more widely spaced, which restores the desired rigidity and allows a greater lubrication volume 18a, b of each bearing, while the intermediate tube 20 still allows a maximum travel as great as in the prior art.
  • a combination of the two effects is preferred, whereby both the maximum travel and the bearing spacing are increased.
  • the invention provides a further advantage over the prior art, namely that during reciprocation of the piston rod 2, the speed of relative movement between the strut case 14 and the cylinder 4 is shared between two pairs of bearings 16a, b.
  • the average sliding speed at each bearing surface 15,22 is approximately half that in the prior art, given the same total extension, with a consequent reduction in the heat generated through friction at the bearing surfaces. This improves the reliability and operational life of the bearings, and also the efficiency of the damper because it operates through the dissipation of heat .

Landscapes

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

Abstract

La présente invention concerne un amortisseur constitué d'un cylindre (4) présentant une face extérieure (15), d'une tige de piston (2) reçue en coulissement dans le cylindre (4), et d'un corps creux (14) solidaire de la tige du piston (2) et agissant contre la face extérieure (15) du cylindre de façon à conserver la tige du piston (2) dans l'alignement du cylindre. Un tube intermédiaire (20) est situé entre le cylindre (4) et le corps creux (14) de façon que la face intérieure du tube intermédiaire (20) soit en contact avec la face extérieure (15) du cylindre (4), et qu'une face intérieure du corps creux (14) soit en contact avec la face extérieure (22) du tube intermédiaire (20). Ce tube intermédiaire (20) permet une détente télescopique de l'amortisseur, ce qui en accroît la longueur de débattement.
PCT/GB1996/001774 1996-07-24 1996-07-24 Amortisseur a debattement etendu WO1998003360A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PCT/GB1996/001774 WO1998003360A1 (fr) 1996-07-24 1996-07-24 Amortisseur a debattement etendu
EP96925035A EP0914491A1 (fr) 1996-07-24 1996-07-24 Amortisseur a debattement etendu
JP10506669A JP2000515614A (ja) 1996-07-24 1996-07-24 大きな移動量をもつダンパ

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/GB1996/001774 WO1998003360A1 (fr) 1996-07-24 1996-07-24 Amortisseur a debattement etendu

Publications (1)

Publication Number Publication Date
WO1998003360A1 true WO1998003360A1 (fr) 1998-01-29

Family

ID=10787747

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1996/001774 WO1998003360A1 (fr) 1996-07-24 1996-07-24 Amortisseur a debattement etendu

Country Status (3)

Country Link
EP (1) EP0914491A1 (fr)
JP (1) JP2000515614A (fr)
WO (1) WO1998003360A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998034046A1 (fr) * 1997-01-30 1998-08-06 Pilot Precision Dampers Limited Montage de reservoir pour amortisseur
FR2819565A1 (fr) * 2001-01-12 2002-07-19 Zf Sachs Ag Amortisseur telescopique
US7925043B2 (en) 2006-12-20 2011-04-12 Xerox Corporation Tactile security feature for document and signature authentication
CN105673765A (zh) * 2016-04-11 2016-06-15 常州气弹簧有限公司 防尘型气弹簧
CN107244200A (zh) * 2016-06-30 2017-10-13 北京京西重工有限公司 包括具有径向突起的轴承套筒的支柱组件

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB242547A (en) * 1925-06-04 1925-11-12 Rudolph Christian Gustav Staat Improvements in shock absorbers
US3363894A (en) * 1965-07-09 1968-01-16 Menasco Mfg Company Dual spring rate shock strut
DE6752835U (de) * 1968-09-20 1969-03-20 Bourcier De Carbon C Elastisches Stützbein, insbesondere für Fahrzeug-Radachsabstützungen
JPS5652639A (en) * 1979-09-29 1981-05-11 Mutoh Ind Ltd Gas spring
JPS6330620A (ja) * 1986-07-24 1988-02-09 Showa Mfg Co Ltd 油圧緩衝器
JPS63170112A (ja) * 1987-01-09 1988-07-14 Atsugi Motor Parts Co Ltd サスペンシヨンユニツト
US4899969A (en) * 1988-01-28 1990-02-13 Fritz Bauer And Sohne Ohg Lockable elevating mechanism for the continuous adjustment of furniture and guide sleeve for such an elevating mechanism
DE3840114A1 (de) * 1988-11-28 1990-06-07 Jun Josef Jochner Sturzkonstante radaufhaengung
DE4240686C1 (de) * 1992-12-03 1994-03-31 Horst Thiele Lenkhubvorrichtung
EP0607545A1 (fr) * 1992-12-02 1994-07-27 Öhlins Racing Ab Amortisseur
US5377942A (en) * 1990-10-31 1995-01-03 Stabilus Gmbh Column unit

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB242547A (en) * 1925-06-04 1925-11-12 Rudolph Christian Gustav Staat Improvements in shock absorbers
US3363894A (en) * 1965-07-09 1968-01-16 Menasco Mfg Company Dual spring rate shock strut
DE6752835U (de) * 1968-09-20 1969-03-20 Bourcier De Carbon C Elastisches Stützbein, insbesondere für Fahrzeug-Radachsabstützungen
JPS5652639A (en) * 1979-09-29 1981-05-11 Mutoh Ind Ltd Gas spring
JPS6330620A (ja) * 1986-07-24 1988-02-09 Showa Mfg Co Ltd 油圧緩衝器
JPS63170112A (ja) * 1987-01-09 1988-07-14 Atsugi Motor Parts Co Ltd サスペンシヨンユニツト
US4899969A (en) * 1988-01-28 1990-02-13 Fritz Bauer And Sohne Ohg Lockable elevating mechanism for the continuous adjustment of furniture and guide sleeve for such an elevating mechanism
DE3840114A1 (de) * 1988-11-28 1990-06-07 Jun Josef Jochner Sturzkonstante radaufhaengung
US5377942A (en) * 1990-10-31 1995-01-03 Stabilus Gmbh Column unit
EP0607545A1 (fr) * 1992-12-02 1994-07-27 Öhlins Racing Ab Amortisseur
DE4240686C1 (de) * 1992-12-03 1994-03-31 Horst Thiele Lenkhubvorrichtung

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 005, no. 112 (M - 079) 21 July 1981 (1981-07-21) *
PATENT ABSTRACTS OF JAPAN vol. 012, no. 241 (M - 716) 8 July 1988 (1988-07-08) *
PATENT ABSTRACTS OF JAPAN vol. 012, no. 437 (M - 765) 17 November 1988 (1988-11-17) *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998034046A1 (fr) * 1997-01-30 1998-08-06 Pilot Precision Dampers Limited Montage de reservoir pour amortisseur
FR2819565A1 (fr) * 2001-01-12 2002-07-19 Zf Sachs Ag Amortisseur telescopique
US7925043B2 (en) 2006-12-20 2011-04-12 Xerox Corporation Tactile security feature for document and signature authentication
CN105673765A (zh) * 2016-04-11 2016-06-15 常州气弹簧有限公司 防尘型气弹簧
CN107244200A (zh) * 2016-06-30 2017-10-13 北京京西重工有限公司 包括具有径向突起的轴承套筒的支柱组件
US10399402B2 (en) 2016-06-30 2019-09-03 Beijingwest Industries Co., Ltd. Strut assembly including a bearing sleeve having a radial protrusion

Also Published As

Publication number Publication date
JP2000515614A (ja) 2000-11-21
EP0914491A1 (fr) 1999-05-12

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