EP0420903A1 - Pneumatic anti-vibration mounting - Google Patents

Pneumatic anti-vibration mounting

Info

Publication number
EP0420903A1
EP0420903A1 EP19890907219 EP89907219A EP0420903A1 EP 0420903 A1 EP0420903 A1 EP 0420903A1 EP 19890907219 EP19890907219 EP 19890907219 EP 89907219 A EP89907219 A EP 89907219A EP 0420903 A1 EP0420903 A1 EP 0420903A1
Authority
EP
European Patent Office
Prior art keywords
vibration mounting
base
pneumatic anti
vibration
mounting
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
EP19890907219
Other languages
German (de)
French (fr)
Inventor
Gordon Lloyd Pumphrey
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.)
Fabreeka International Holdings Inc
Original Assignee
Fabreeka International Inc
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 Fabreeka International Inc filed Critical Fabreeka International Inc
Publication of EP0420903A1 publication Critical patent/EP0420903A1/en
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
    • F16F9/02—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum
    • F16F9/04—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum in a chamber with a flexible wall
    • F16F9/0418—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum in a chamber with a flexible wall having a particular shape, e.g. annular, spherical, tube-like
    • F16F9/0427—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum in a chamber with a flexible wall having a particular shape, e.g. annular, spherical, tube-like toroidal

Definitions

  • This Invention relates to a Pneumatic Anti-Vibration Mounting.
  • Pneumatic Anti-vibration Mountings are not new, normally being in the form of convoluted bellows, a toroidal ring contained within a metal case, what is known as a rolling diaphram or a diaphrame fitted into a rigid or semi rigid base.
  • Versions of the presently available Air Mounts tend to either have low natural frequency combined with low damping and lack of stability or on the other hand having a higher natural frequency but providing greater damping and stability while also being captive.
  • the presently described Invention combines the most desirable features of the above described mounting offering a very low nateral frequency combined with captivity and a variable degree of damping.
  • a pneumatic anti-vibration mounting comprising a flexible inflatable hallow chamber, having a hole through its centre into which is located as a sliding fit, a central threaded bush.
  • the bush top is attached to the underside of a top cover, onto which the mounted equipment is secured.
  • a circular distance piece Positioned around the central bush immediatly below the centre of the top cover and in contact with the top of the air chamber is positioned a circular distance piece.
  • Attached to the bottom of the air chamber is a base which has a vertical hole at its top centre, this being of suitable diameter to allow the air chamber not being attached to the threaded bush when deflected by the supported load, to act in the manner of a rolling diaphram.
  • An air chamber inflation valve can be positioned so as to connect directly into the air chamber or fitted into the base and connected to the air chamber by a pipe.
  • a captive version of the mounting can be provided by extending the threaded bush down into a taller base with a hollow centre, a suitable base plate being attached to the base, and with the addition of a bump stop secured to the bottom of the central threaded bush.
  • Fig 1 illustrates a plan view of a typical mounting.
  • Fig 2 illustrates a cut away section allong axis A-A1.
  • a free standing version of the anti-vibration mounting comprises an inflatable flexible air chamber 1 contained within a protective top cover 2.
  • a central threaded bush 3 is a sliding fit into the centre of air chamber 1 and is attached to the underside of protective top cover 2.
  • Located around the central bush 3 and positioned between the air chamber 1 and the top cover 2 is a circular distance piece 4.
  • Attached to the bottom of the air chamber 1 is a base 5 having a air chamber protective sealing lip 6 which bears as a sliding fit on top cover 2.
  • An inflation valve 7 can be fitted directly into the air chamber through slot 8 or alternatively an inflation valve 9 can be fitted into the base and connected to the air chamber by a pipe 10.
  • the base of the free standing version of the mounting does not include items shown Fig 1 and Fig 2 below line B-B1 on Fig 2.
  • a captive bolt down version of the mounting comprises all the features described above but with an extended base below line B-B1 Fig 2.
  • An extended central bush 3 protruding through a hole in the top of base plate 11 a bump stop 12 when secured to the bottom of central bush 3 prevents the mounted equipment 13 secured by bolt 14, from being completely detached from the item to which base plate 11 is bolted.
  • the flexible air chamber 3 could be filled or partly filled with liquid, gas, cellurlar or any suitable resilient material being either inflatable, vented or sealed.
  • the protective cover 1 is not essential to the satisfactory operation of the mounting normally only being in contact with the bottom of the cover or only the distance piece 4. If desireable the outer periphery of the air chamber 1 can be designed to contact the inside of the downstanding walls of the protective cover 2 while increasing natural frequency slightly, improving damping and mounted equipment stability. For many application a flat plate could be sudstituted for the protective cover 2.
  • the air chamber In operation with correct loading the air chamber will be compressed causing the outer walls to flex and the area adjacent to the central bush at the bottom to act in the manner of a rolling diaphram the final operating position of the bump stop 12 being approx mid way between its fully up and fully down positions and the mounted equipment B being effectively isolate from the base 5. Should the air chamber 1 fail or be overload, the bump stop which is coated with a flexible material 15 rests on the supporting member 16. Extreme excursions of the mounted equipment laterally are contained by contact between bump stop 12 and base plate 11 also by contact between protective cover 2 and base 5.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Combined Devices Of Dampers And Springs (AREA)
  • Fluid-Damping Devices (AREA)
  • Vibration Prevention Devices (AREA)

Abstract

On a mis au point un montage pneumatique anti-vibration comportant un couvercle (2) supérieur de type cuvette plate ou renversé, afin de monter l'équipement au-dessous duquel se trouve une chambre creuse gonflable (1) ayant approximativement la forme d'un tore. Un manchon (3) fileté central fixé en dessous du couvercle supérieur et passant vers le bas à travers le centre de la chambre creuse, passe dans une cavité se trouvant dans la base (5) fixée au fond de la chambre creuse. Un arrêt de butée (12) assis est fixé au fond du manchon central. Une version du montage à éléments prisonniers comprend une plaque de base (11) étendue comportant des trous de fixation au bas. Le gonflage de la chambre via une valve (7) ou la connexion dans la base ou la paroi de la chambre à air ont pour effet de faire s'élever l'équipement monté formant ainsi un isolant anti-vibration et anti-choc très efficace.An anti-vibration pneumatic assembly has been developed comprising an upper cover (2) of the flat or inverted bowl type, in order to mount the equipment below which there is an inflatable hollow chamber (1) having approximately the shape of a torus. A central threaded sleeve (3) fixed below the upper cover and passing down through the center of the hollow chamber, passes into a cavity located in the base (5) fixed to the bottom of the hollow chamber. A seated stop stop (12) is fixed to the bottom of the central sleeve. A version of the captive element assembly includes an extended base plate (11) with mounting holes at the bottom. The inflation of the chamber via a valve (7) or the connection in the base or the wall of the air chamber have the effect of raising the mounted equipment thus forming a very effective anti-vibration and anti-shock insulation. .

Description

PNEUMATIC ANTI-VIBRATION MOUNTING
SPECIFICATION
This Invention relates to a Pneumatic Anti-Vibration Mounting.
Pneumatic Anti-vibration Mountings are not new, normally being in the form of convoluted bellows, a toroidal ring contained within a metal case, what is known as a rolling diaphram or a diaphrame fitted into a rigid or semi rigid base.
Versions of the presently available Air Mounts tend to either have low natural frequency combined with low damping and lack of stability or on the other hand having a higher natural frequency but providing greater damping and stability while also being captive. The presently described Invention combines the most desirable features of the above described mounting offering a very low nateral frequency combined with captivity and a variable degree of damping.
According to the present Invention there is provided a pneumatic anti-vibration mounting comprising a flexible inflatable hallow chamber, having a hole through its centre into which is located as a sliding fit, a central threaded bush. The bush top is attached to the underside of a top cover, onto which the mounted equipment is secured. Positioned around the central bush immediatly below the centre of the top cover and in contact with the top of the air chamber is positioned a circular distance piece. Attached to the bottom of the air chamber is a base which has a vertical hole at its top centre, this being of suitable diameter to allow the air chamber not being attached to the threaded bush when deflected by the supported load, to act in the manner of a rolling diaphram. An air chamber inflation valve can be positioned so as to connect directly into the air chamber or fitted into the base and connected to the air chamber by a pipe. A captive version of the mounting can be provided by extending the threaded bush down into a taller base with a hollow centre, a suitable base plate being attached to the base, and with the addition of a bump stop secured to the bottom of the central threaded bush.
A specific embodiment of the invention will now be described by way of example with reference to the accompanying drawings in which:-
Fig 1 illustrates a plan view of a typical mounting.
Fig 2 illustrates a cut away section allong axis A-A1.
Refering to the drawings indicated in Fig .1. shown with the air chamber inflated with the mounting at Its maximum extension a free standing version of the anti-vibration mounting comprises an inflatable flexible air chamber 1 contained within a protective top cover 2. A central threaded bush 3 is a sliding fit into the centre of air chamber 1 and is attached to the underside of protective top cover 2. Located around the central bush 3 and positioned between the air chamber 1 and the top cover 2 is a circular distance piece 4. Attached to the bottom of the air chamber 1 is a base 5 having a air chamber protective sealing lip 6 which bears as a sliding fit on top cover 2. An inflation valve 7 can be fitted directly into the air chamber through slot 8 or alternatively an inflation valve 9 can be fitted into the base and connected to the air chamber by a pipe 10. The base of the free standing version of the mounting does not include items shown Fig 1 and Fig 2 below line B-B1 on Fig 2. A captive bolt down version of the mounting comprises all the features described above but with an extended base below line B-B1 Fig 2. An extended central bush 3 protruding through a hole in the top of base plate 11 a bump stop 12 when secured to the bottom of central bush 3 prevents the mounted equipment 13 secured by bolt 14, from being completely detached from the item to which base plate 11 is bolted.
The flexible air chamber 3 could be filled or partly filled with liquid, gas, cellurlar or any suitable resilient material being either inflatable, vented or sealed.
The protective cover 1 is not essential to the satisfactory operation of the mounting normally only being in contact with the bottom of the cover or only the distance piece 4. If desireable the outer periphery of the air chamber 1 can be designed to contact the inside of the downstanding walls of the protective cover 2 while increasing natural frequency slightly, improving damping and mounted equipment stability. For many application a flat plate could be sudstituted for the protective cover 2.
In operation with correct loading the air chamber will be compressed causing the outer walls to flex and the area adjacent to the central bush at the bottom to act in the manner of a rolling diaphram the final operating position of the bump stop 12 being approx mid way between its fully up and fully down positions and the mounted equipment B being effectively isolate from the base 5. Should the air chamber 1 fail or be overload, the bump stop which is coated with a flexible material 15 rests on the supporting member 16. Extreme excursions of the mounted equipment laterally are contained by contact between bump stop 12 and base plate 11 also by contact between protective cover 2 and base 5.

Claims

PNEUMATIC AFTI-VIBRATION MOUNTINGCLAIMS
1. A pneumatic anti-vibration mounting comprising a flexible, hollow and inflatable chamber in the approximate form of a toroid. An equipment supporting top cover with a threaded bush attached and passing as a push or sliding fit, down through the inflatable chamber centre hole. A sit down or bump stop is secured to the bottom of the bush. A free standing base is attached to the bottom of the inflatable chamber incorporating an air passage and inflation connection or valve. The bottom of the inflatable chamber has an area surrounding the central bush which is free of contact with the base, thereby allowing it to flex.
2. A pneumeatic anti-vibration mounting as claimed in Claim .1. wherein a circular distance piece is positioned around the central bush above the inflatable chamberand in contact with the bottom of the top cover.
3. A pneumatic anti-vibration mounting as claimed in Claim .1. or .2. wherein the inflation valve or connection is connected directly into the inflatable chamber wall and not through the base.
4. A pneumatic anti-vibration mounting as claimed in any preceeding Claim wherein the top cover is in the form of an inverted dish with a flat top and a downstanding vertical wall at its periphery, and distanced from the air chamber at all times.
5. A pneumatic anti-vibration mounting as claimed in any preceeding Claim wherein the downstanding periphery walls distance from the top centre are varied to form contact with the inflatable chamber under varying pressures and loads
6. A pneumatic anti-vibration mounting as claimed in Claims 1-3 wherein the top cover is in the form of a flat plate.
7. A pneumatic anti-vibration mounting as claimed in any preceeding Claim wherein a captive version of the mounting is provided by extending the central threaded bush down into a deeper base with a hollow centre. A base plate with securing holes or slots extending up into the base cavity and above, the sit down or bump stop prevents the top cover and therby the mounted equipment from moving more than a predetermined amount.
8. A pneumatic anti-vibration mounting as claimed in any preceeding Claim wherein the hollow chamber if filled or partially filled by with liquid, gas, cellular or any resilient material or any combination of them.
9. A pneumatic anti-vibration mounting as claimed in any preceeding Claim wherein the hollow chamber is sealed.
10. A pneumatic anti-vibration mounting substantially as described herein with reference to figures 1 and 2 of the accompanying drawings.
EP19890907219 1988-06-13 1989-06-13 Pneumatic anti-vibration mounting Ceased EP0420903A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8813985A GB2223080B (en) 1988-06-13 1988-06-13 Pneumatic anti-vibration mounting
GB8813985 1988-06-13

Publications (1)

Publication Number Publication Date
EP0420903A1 true EP0420903A1 (en) 1991-04-10

Family

ID=10638569

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890907219 Ceased EP0420903A1 (en) 1988-06-13 1989-06-13 Pneumatic anti-vibration mounting

Country Status (4)

Country Link
EP (1) EP0420903A1 (en)
AU (1) AU3776089A (en)
GB (1) GB2223080B (en)
WO (1) WO1989012764A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4228513A1 (en) * 1992-08-27 1994-03-03 Phoenix Ag Air spring for supporting vibrating body - has pressurised gas supply pipe connected in at side central area of bellows.
DE10151497B4 (en) * 2001-10-18 2005-08-04 Burkhard Oest Gas spring
CN108150271B (en) * 2016-12-02 2021-08-27 福特环球技术公司 Vehicle exhaust system isolator and related exhaust system assembly
CN107060130B (en) * 2017-06-15 2022-04-22 金陵科技学院 Gas shock insulation support

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1388967A (en) * 1919-06-03 1921-08-30 N C L Engineering Corp Vibration-quenching mount for internal-combustion motors
US1403466A (en) * 1920-10-02 1922-01-10 Thos J Corcoran Lamp Co Air spring
US2790634A (en) * 1955-06-23 1957-04-30 Thomas L Fawick Pneumatic cushioning assembly for vehicles and the like
US3008703A (en) * 1959-07-03 1961-11-14 Gen Tire & Rubber Co Vibration isolating air spring
GB1054896A (en) * 1964-04-24 1967-01-11
DE2309276A1 (en) * 1973-02-24 1974-08-29 Volkswagenwerk Ag GAS SPRING ARRANGEMENT
DE2750667C2 (en) * 1977-11-12 1980-01-24 Daimler-Benz Ag, 7000 Stuttgart Air springs for automobiles
GB2088996B (en) * 1980-10-10 1985-05-15 Pumphrey Gordon Lloyd Inflatable anti-vibration mounting
DE3038271C2 (en) * 1980-10-10 1986-07-31 Boge Gmbh, 5208 Eitorf Elastic bearing
JPS6134180Y2 (en) * 1981-01-07 1986-10-06
GB2124731A (en) * 1982-06-22 1984-02-22 Gordon Lloyd Pumphrey Inflatable anti-vibration mounting
GB8327904D0 (en) * 1983-10-19 1983-11-23 Pumphrey G L Inflatable anti-vibration mountings
DE3606325A1 (en) * 1986-02-27 1987-09-03 Talbot Waggonfab UNDERCARRIAGE SUSPENSION FOR RAIL VEHICLES
GB2201222A (en) * 1986-12-04 1988-08-24 Ivt Ltd Anti-vibration mounting

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8912764A1 *

Also Published As

Publication number Publication date
GB2223080A (en) 1990-03-28
AU3776089A (en) 1990-01-12
GB2223080B (en) 1992-07-08
WO1989012764A1 (en) 1989-12-28
GB8813985D0 (en) 1988-07-20

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