GB2144825A - Hydraulically damped elastomeric mountings - Google Patents

Hydraulically damped elastomeric mountings Download PDF

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Publication number
GB2144825A
GB2144825A GB08415695A GB8415695A GB2144825A GB 2144825 A GB2144825 A GB 2144825A GB 08415695 A GB08415695 A GB 08415695A GB 8415695 A GB8415695 A GB 8415695A GB 2144825 A GB2144825 A GB 2144825A
Authority
GB
United Kingdom
Prior art keywords
holes
mounting
dividing wall
chambers
return valve
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
GB08415695A
Other versions
GB2144825B (en
GB8415695D0 (en
Inventor
Gunter Eberhard
Jurgen Heitzig
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.)
Continental AG
Original Assignee
Continental Gummi Werke 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 Continental Gummi Werke AG filed Critical Continental Gummi Werke AG
Publication of GB8415695D0 publication Critical patent/GB8415695D0/en
Publication of GB2144825A publication Critical patent/GB2144825A/en
Application granted granted Critical
Publication of GB2144825B publication Critical patent/GB2144825B/en
Expired legal-status Critical Current

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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
    • F16F13/00—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs
    • F16F13/04—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper
    • F16F13/06—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper
    • F16F13/08—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper the plastics spring forming at least a part of the wall of the fluid chamber of the damper
    • F16F13/10—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper the plastics spring forming at least a part of the wall of the fluid chamber of the damper the wall being at least in part formed by a flexible membrane or the like
    • F16F13/105—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper the plastics spring forming at least a part of the wall of the fluid chamber of the damper the wall being at least in part formed by a flexible membrane or the like characterised by features of partitions between two working chambers

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Combined Devices Of Dampers And Springs (AREA)
  • Details Of Valves (AREA)
  • Arrangement Or Mounting Of Propulsion Units For Vehicles (AREA)

Abstract

In hydraulically damped elastic engine mountings, cavitation phenomena easily occur within the damping fluid under certain circumstances, and said phenomena manifest themselves in undesirable jarring noises. The invention prevents this from happening by installing a non-return valve 10 in the wall 7 dividing the chambers 6, 6, and said non-return valve releases an additional flow cross- section after the pressure in one of the fluid-filled damping chambers exceeds a certain value. The dividing wall has permanently open throttle bores 17 (containing a porous substance 37) in parallel with unrestricted bores 27 controlled by the flexible valve disc 10. <IMAGE>

Description

SPECIFICATION An elastic mounting The present invention relates to an elastic mounting provided with hydraulic damping, particularly for motor vehicle engines, said mounting having two chambers which are filled with a damping fluid and are outwardly sealed by rubber-elastic spring members, and said chambers being connected one beneath the other through the intermediary of throttle holes which are formed in a common rigid dividing wall and are permanently open.
A measure which has been known for a long time and has also been introduced on a wide scale already in the motor vehicle construction industry for damping undesirable vibrations of the elastic engine mountings is to provide said mountings with a fluid-filled chamber which is sealed on all sides and to restrain spring movements by displacing the fluid over throttled flow paths in a rigid dividing wall which divides the chamber into two partial chambers having different volumetric capacities. In conventional arrangements, these damping devices produce noises under certain conditions and under certain operational circumstances and, as close investigation has shown, said noises result from cavitation phenomena.The danger associated with the production of such noises which manifest themselves as jarring noises, especially during the starting and stopping of the engine, arises particularly in the cases where flexible diaphragms, which have practically no resiliency, are used as the sealing wall for a partial fluid chamber. The invention seeks, therefore, to prevent cavitation occurring in the damping device and, as a consequence thereof, to prevent the production of undesirable mounting noises.
According to the present invention there is provided an elastic mounting provided with hydraulic damping, particularly for motor vehicle engines, said mounting having two chambers which are filled with a damping fluid and are outwardly sealed by rubberelastic spring members, and said chambers being connected one beneath the other through the intermediary of throttle holes which are formed in a common, rigid dividing wall and are permanently open, in which unthrottled holes which are sealable in one direction, are provided in the dividing wall parallel to the throttle holes.
In an embodiment of the invention the unthrottled holes have an associated non-return valve which closes in the inward (oscillation) direction of the mounting and may advantageously be in the form of a flexible disc mounted on the dividing wall and covering the unthrottled holes.
In the outward (oscillation) direction, the invention permits the damping fluid to flow directly in an unthrottled manner and to bypass the throttle holes as soon as the pressure gradient on both sides of the rigid dividing wall exceeds a limit value which is dependent on the elasticity of the blocking disc of the non-return valve. The reason for additional movements is removed due to the rapid balance of pressure and hence, at the same time, the source of noise-which would otherwise come into effect-is also eliminated.
The present invention will be further illustrated, by way of example, with reference to the accompanying drawings, in which: Figure 1 is a considerably simplified, crosssectional view through an engine mounting having a conventional arrangement; and Figure 2 is a also a cross-sectional view, on an enlarged scale, of part of a non-return valve suitable for the mounting shown in Fig.
1.
In respect of its basic components, the mounting illustrated in Fig. 1 comprises a housing 3 having sealing walls formed, on the one hand, by a rubber spring member 4 and, on the other hand, by a diaphragm 5. The chamber 6 within the housing 3 is completely sealed outwardly and is divided by a rigid dividing wall 7 into an upper chamber and a lower chamber, both of these chambers being constantly connected one below the other through the intermediary of one or more throttle holes 1 7 formed in the dividing wall 7.
The entire chamber 6 is fully filled with a damping fluid.
The mounting serves, for example, to support the engine in a motor vehicle. It is detachably mounted on the chassis 9, or on a component part which is securely connected thereto, and absorbs the associated portion of static and dynamic engine loading (shown by arrow P) through the intermediary of a thrust or pressure member which is vulcanised in the spring member 4. The deformations of the spring member 4, which are produced because of alternate loadings P, cause the damping fluid to be displaced through the throttle hole 1 7 in the dividing wall 7 between the two partial chambers of the chamber 6 which has a variable volume.Because the cross-section of the overflow path is considerably restricted or reduced, thereby making it impossible for pressure differences to be balanced on both sides of the rigid dividing wall 3, the mounting is not subjected to any undesirable amplitude increase in the resonant range. On the other hand, however, the influence of large vibrational amplitudes easily produces the feared cavitation phenomena.
Such phenomena are eliminated by the new type of arrangement illustrated in Fig. 2.
In the embodiment which is illustrated in fragmentary form, the dividing wall 7 is composed of two layers with a porous substance 37 embedded therebetween, so that the flow of the damping fluid-which follows the pres sure differences through the holes 1 7 is throttled in the narrow, branched pores of the substance 37. Additional holes 27 extend parallel to the permanently open throttle holes 1 7 and pores of the substance 37 and have a comparatively wide, unthrottled through-flow cross-section. On the upper surface of the dividing wall 7, the holes 27 are covered by a rubber disc 10 centrally retained by a setscrew 11 which is screwed into the dividing wall and is provided with a pressure plate 1 2.
Normally, that is to say, when there is equal pressure on both sides of the dividing wall and when a pressure gradient prevails in the direction of from top to bottom (arow Z), the disc 1 0which lies directly on the dividing wall 7 and acts with said wall as a non-return valve--seals the additional holes 27, so that pressure differences under these circumstances can then only be balanced in damped manner through the intermediary of the throttle holes 1 7 and 37. However, in the reverse flow direction from botton to top (arrow A), the elastically deformable disc 10 is raised from the dividing wall and releases the unthrottled flow path through the wide holes 27.

Claims (4)

1. An elastic mounting provided with hydraulic damping, particularly for motor vehicle engines, said mounting having two chambers which are filled with a damping fluid and are outwardly sealed by rubber-elastic spring members, and said chambers being connected one beneath the other through the intermediary of throttle holes which are formed in a common, rigid dividing wall and are permanently open, in which unthrottled holes, which are sealable in one direction, are provided in the dividing wall parallel to the throttle holes.
2. A mounting as claimed in claim 1, in which the unthrottled holes have an associated non-return valve which closes in the inward oscillation direction.
3. A mounting as claimed in claim 2, in which the non-return valve is formed by a flexible disc mounted on the dividing wall and covering the unthrottled holes.
4. An elastic mounting, substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
GB08415695A 1983-06-29 1984-06-20 Hydraulically damped elastomeric mountings Expired GB2144825B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19833323422 DE3323422A1 (en) 1983-06-29 1983-06-29 ELASTIC BEARING

Publications (3)

Publication Number Publication Date
GB8415695D0 GB8415695D0 (en) 1984-07-25
GB2144825A true GB2144825A (en) 1985-03-13
GB2144825B GB2144825B (en) 1986-11-26

Family

ID=6202691

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08415695A Expired GB2144825B (en) 1983-06-29 1984-06-20 Hydraulically damped elastomeric mountings

Country Status (6)

Country Link
DE (1) DE3323422A1 (en)
ES (1) ES279998Y (en)
FR (1) FR2548314B3 (en)
GB (1) GB2144825B (en)
IT (1) IT1176185B (en)
SE (1) SE457659B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3347274C2 (en) * 1983-12-28 1987-02-26 Lemförder Metallwaren AG, 2844 Lemförde Hydraulic vibration damper for elastic support bearings in motor vehicles
JPS60184737A (en) * 1984-02-21 1985-09-20 Honda Motor Co Ltd Hydraulic mount
DE3835384A1 (en) * 1988-10-18 1990-04-19 Freudenberg Carl Fa RUBBER BEARING

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB942829A (en) * 1960-02-18 1963-11-27 Moulton Development Ltd Improvements in resilient suspension units
GB1054896A (en) * 1964-04-24 1967-01-11
GB1267637A (en) * 1969-09-04 1972-03-22 Abex Corp Shock absorber unit
GB1312130A (en) * 1969-08-18 1973-04-04 Clevite Corp Elastomeric spring and shock absorber
GB2033534A (en) * 1978-10-13 1980-05-21 Gould Inc Combined elastomeric spring and fluid damper
GB1581935A (en) * 1976-06-30 1980-12-31 Peugeot Damper device in particular for the suspension of an engine
EP0038062A2 (en) * 1980-04-14 1981-10-21 Nissan Motor Co., Ltd. Damper in particular for suspension of an engine
GB2104619A (en) * 1981-06-29 1983-03-09 Continental Gummi Werke Ag A damped resilient mounting, for vehicle engine
EP0098330A1 (en) * 1982-07-09 1984-01-18 Firma Carl Freudenberg Elastic rubber support

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1280076A (en) * 1960-11-17 1961-12-29 P C C Advanced hydraulic shock absorber
DE2833776C2 (en) * 1977-03-23 1983-12-15 Boge Gmbh, 5208 Eitorf Two-chamber engine mount

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB942829A (en) * 1960-02-18 1963-11-27 Moulton Development Ltd Improvements in resilient suspension units
GB1054896A (en) * 1964-04-24 1967-01-11
GB1312130A (en) * 1969-08-18 1973-04-04 Clevite Corp Elastomeric spring and shock absorber
GB1267637A (en) * 1969-09-04 1972-03-22 Abex Corp Shock absorber unit
GB1581935A (en) * 1976-06-30 1980-12-31 Peugeot Damper device in particular for the suspension of an engine
GB2033534A (en) * 1978-10-13 1980-05-21 Gould Inc Combined elastomeric spring and fluid damper
EP0038062A2 (en) * 1980-04-14 1981-10-21 Nissan Motor Co., Ltd. Damper in particular for suspension of an engine
GB2104619A (en) * 1981-06-29 1983-03-09 Continental Gummi Werke Ag A damped resilient mounting, for vehicle engine
EP0098330A1 (en) * 1982-07-09 1984-01-18 Firma Carl Freudenberg Elastic rubber support

Also Published As

Publication number Publication date
GB2144825B (en) 1986-11-26
SE457659B (en) 1989-01-16
IT1176185B (en) 1987-08-18
DE3323422A1 (en) 1985-01-03
ES279998U (en) 1985-01-16
FR2548314A1 (en) 1985-01-04
ES279998Y (en) 1985-07-16
FR2548314B3 (en) 1985-12-13
GB8415695D0 (en) 1984-07-25
IT8421062A1 (en) 1985-11-23
IT8421062A0 (en) 1984-05-23
SE8403233D0 (en) 1984-06-15
SE8403233L (en) 1984-12-30

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PCNP Patent ceased through non-payment of renewal fee