GB2015693A - Hydropneumatic shock absorbers - Google Patents

Hydropneumatic shock absorbers

Info

Publication number
GB2015693A
GB2015693A GB7906492A GB7906492A GB2015693A GB 2015693 A GB2015693 A GB 2015693A GB 7906492 A GB7906492 A GB 7906492A GB 7906492 A GB7906492 A GB 7906492A GB 2015693 A GB2015693 A GB 2015693A
Authority
GB
United Kingdom
Prior art keywords
piston
gas pressure
piston rod
cylinder
working chamber
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
Application number
GB7906492A
Other versions
GB2015693B (en
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.)
ZF Friedrichshafen AG
Original Assignee
Fichtel and Sachs AG
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 Fichtel and Sachs AG filed Critical Fichtel and Sachs AG
Publication of GB2015693A publication Critical patent/GB2015693A/en
Application granted granted Critical
Publication of GB2015693B publication Critical patent/GB2015693B/en
Expired 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
    • F16F9/34—Special valve constructions; Shape or construction of throttling passages
    • 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
    • F16F9/062—Bi-tubular units

Landscapes

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

Abstract

Damping apparatus, for example a shock absorber or spring strut for vehicles, comprises a cylinder 1 in which a piston rod 2 is guided axially movably and is sealed and a piston 3 fastened to the piston rod 2 and provided with damping devices for the tension and compression stages. The piston 3 divides the cylinder interior into two working chambers 4, 5 which have a liquid filling. One working chamber 4 is defined by the piston rod 2 and the cylinder 1 and the other working chamber 5 is in communication via a permanently open passage 7 with a compensating chamber 6 having a liquid-filled portion and a gas-filled, pressurised portion. According to the invention; the permanently open passage 7 is so dimensioned that at low piston speeds only the gas pressure prevailing in the compensating chamber 6 counteracts the damping force in a compression direction, and at a higher piston speed a pressure acting additionally to the gas pressure is built up in the other working chamber 5. This construction enables a reduced gas pressure to be used, which minimises sealing problems. <IMAGE>
GB7906492A 1978-02-28 1979-02-23 Hydropneumatic shock absorbers Expired GB2015693B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19782808481 DE2808481A1 (en) 1978-02-28 1978-02-28 SHOCK ABSORBER OR SHOCK ABSORBER FOR VEHICLES

Publications (2)

Publication Number Publication Date
GB2015693A true GB2015693A (en) 1979-09-12
GB2015693B GB2015693B (en) 1983-02-23

Family

ID=6033116

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7906492A Expired GB2015693B (en) 1978-02-28 1979-02-23 Hydropneumatic shock absorbers

Country Status (4)

Country Link
DE (1) DE2808481A1 (en)
FR (1) FR2418393A1 (en)
GB (1) GB2015693B (en)
IT (1) IT1118399B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0041342A2 (en) * 1980-06-03 1981-12-09 LUCAS INDUSTRIES public limited company Improvements in suspension struts for vehicles
GB2116666A (en) * 1982-02-20 1983-09-28 Fichtel & Sachs Ag A hydropneumatic damping device with gas return valve
GB2230585A (en) * 1989-03-15 1990-10-24 Fichtel & Sachs Ag Double-tube oscillation damper

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2905928A1 (en) * 1979-02-16 1980-08-28 Fichtel & Sachs Ag HYDROPNEUMATIC TWO-TUBE VIBRATION DAMPER WITH BLEEDING VALVE
IT1144348B (en) * 1981-05-08 1986-10-29 Iao Industrie Riunite Spa IMPROVEMENTS IN TELESCOPIC HYDRAULIC SHOCK ABSORBERS OF THE BITUBO TYPE
DE3128723A1 (en) * 1981-07-21 1983-02-10 Fichtel & Sachs Ag, 8720 Schweinfurt HYDROPNEUMATIC TWO TUBE VIBRATION DAMPER OR SHOCK ABSORBER INSERT WITH A CAP FOR A CONTAINER TUBE
DE4424432C2 (en) * 1994-07-12 1998-04-16 Mannesmann Sachs Ag Vibration damper, especially shock absorber, with variable damping force
CN113714733A (en) * 2021-05-28 2021-11-30 中铁七局集团电务工程有限公司 Production process of high-sealing pneumatic tension compensation device

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE569111C (en) * 1932-01-12 1933-01-28 Fiat Spa Air suspension, in particular for motor vehicles
US2159289A (en) * 1937-03-15 1939-05-23 Monree Auto Equipment Company Valve construction
FR1081491A (en) * 1953-07-21 1954-12-20 Damper
DE1405886A1 (en) * 1960-12-07 1969-12-04 Deutsche Bundesbahn Shock absorbers
GB1033810A (en) * 1963-07-15 1966-06-22 Woodhead Monroe Ltd Improvements relating to vibration dampers
DE1525004B2 (en) * 1966-02-21 1970-04-30 Woodhead Mfg. Company Ltd., Ossett, Yorkshire (Großbritannien) Shock absorbers
GB1227949A (en) * 1967-10-17 1971-04-15
ES351179A1 (en) * 1968-03-02 1969-05-16 Stromberg Internacional S A Priming or background valve for hydraulic shock absorbers. (Machine-translation by Google Translate, not legally binding)
DE1912781C3 (en) * 1969-03-13 1974-08-15 Fichtel & Sachs Ag, 8720 Schweinfurt Hydropneumatic shock absorber with valve-controlled ventilation system
DE2257557A1 (en) * 1972-11-24 1974-06-06 Fichtel & Sachs Ag VENTILATION DEVICE FOR TWO-TUBE VIBRATION DAMPER USED BY A RIGID WASHER
DE2455267C3 (en) * 1974-11-22 1980-06-12 Boge Gmbh, 5208 Eitorf Guide bearings, in particular for Mc Pherson struts of motor vehicles
FR2343166A1 (en) * 1976-03-05 1977-09-30 Boge Gmbh Double tube vehicle damper - has chamber formed round piston rod by sealed off supporting tube
JPS52113477A (en) * 1976-03-19 1977-09-22 Tokico Ltd Oil hydraulic buffer
JPS53136488U (en) * 1977-04-01 1978-10-28

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0041342A2 (en) * 1980-06-03 1981-12-09 LUCAS INDUSTRIES public limited company Improvements in suspension struts for vehicles
EP0041342A3 (en) * 1980-06-03 1982-01-20 LUCAS INDUSTRIES public limited company Improvements in suspension struts for vehicles
GB2116666A (en) * 1982-02-20 1983-09-28 Fichtel & Sachs Ag A hydropneumatic damping device with gas return valve
US4482036A (en) * 1982-02-20 1984-11-13 Fichtel & Sachs Ag Hydropneumatic damping device
GB2230585A (en) * 1989-03-15 1990-10-24 Fichtel & Sachs Ag Double-tube oscillation damper
GB2230585B (en) * 1989-03-15 1992-10-28 Fichtel & Sachs Ag A double-tube oscillation damper

Also Published As

Publication number Publication date
GB2015693B (en) 1983-02-23
FR2418393A1 (en) 1979-09-21
FR2418393B1 (en) 1985-05-03
IT7967388A0 (en) 1979-02-21
IT1118399B (en) 1986-02-24
DE2808481A1 (en) 1979-09-06

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Legal Events

Date Code Title Description
PE20 Patent expired after termination of 20 years

Effective date: 19990222