Spring devices – Rubber
Patent
1994-06-21
1996-05-21
Ballato, Josie
Spring devices
Rubber
267292, 248633, 105453, F16F 142, F16F 136, B61F 500
Patent
active
055182275
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to an elastomeric mounting of the kind comprising a body of elastomeric material having an end portion bonded to a substantially rigid end member against which the elastomeric material comes into increasing contact when subject to compression load.
The invention relates in particular, though not exclusively, to an elastomeric mounting of the kind comprising a body of elastomeric material located between and bonded to a pair of rigid end members at least one of which is arranged such that the elastomeric material comes into increasing contact therewith when subject to compression loads. An example of an elastomeric mounting of this kind and of a type adapted for high performance, heavy duty applications is described and claimed in the specification of assignee's UK Patent No. 2156947. As compared with a simple elastomeric bush having a cylindrical body of elastomeric material, the elastomeric body of the mounting of GB 2156947 differs notably in that the outer surface is of a non cylindrical circular section profile with the outer diameter of the bonded area at one end being significantly greater than at the other end.
The invention also relates in particular, though not exclusively, to an elastomeric mounting having a pair of end zones the surfaces of which are bonded to respective confronting surfaces of a pair of rigid end members for compression therebetween, with at least one of said rigid end members extending radially outwardly from a longitudinal compression axis of the mounting to beyond the bonded interface and with said at least one end being an end at which the bonded area extends radially outwards for further than the bonded area at the other end. The elastomeric mounting may be of a kind adapted for use in a high dynamic loading application, such as the suspension of a rail freight vehicle.
SUMMARY OF THE INVENTION
The present invention seeks to provide an elastomeric mounting, for example of a type such as desribed above with reference to GB 2156947 or as described in the preceding paragraph, which has a good dynamic load capability.
In accordance with one of its aspects the present invention provides an elastomeric mounting comprising a body of elastomeric material having end zones the surfaces of which are bonded to respective confronting surfaces of a pair of rigid end members for compression therebetween, at least a first of said rigid end members extending radially outwardly from a longitudinal compression axis of the mounting to lie beyond the bonded interface, said first rigid end member having outwards of the bonded interface an abutment face which is contacted by the elastomeric body when subject to compression loading, the first rigid end member defining a discontinuity whereby the interface and abutment face depart from a wholly co-planar form, the body of elastomeric material being substantially hollow in the vicinity of the first of said end regions and substantially solid in the vicinity of the second of said end regions and the bonded interface at said first member extending radially outwards for further than the bonded area at the other end of the mounting.
The bonded interface of the first end member may be substantially planar and may extend in a plane substantially perpendicular to said longitudinal compression axis.
The discontinuity may be provided substantially adjacent to the bonded interface portion of the end member or radially outwards of the radially outer extremity of that bonded interface. The discontinuity may be provided in a substantially planar bonded interface.
The discontinuity preferably is of a substantially smooth form whereby it does not present a stress concentration point or tear initiation zone to contacting elastomeric material of the body when under compression.
The discontinuity may comprise a depression in the abutment zone or, more preferably, between the abutment zone and bonded interface. Alternatively or additionally it may comprise a raised region whereby at least a part of the abutment z
REFERENCES:
patent: 2783959 (1957-03-01), Boschi et al.
patent: 3584858 (1971-06-01), Beck
patent: 4781365 (1988-11-01), Harrison
patent: 5246214 (1993-09-01), Wolf et al.
patent: 5310276 (1994-05-01), Bergers et al.
Ballato Josie
Dunlop Limited a British Company
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