Motor vehicles – Power – Having specific motor-to-body-frame relationship
Patent
1990-05-30
1991-07-30
Mitchell, David M.
Motor vehicles
Power
Having specific motor-to-body-frame relationship
180292, 180312, F16F 1508
Patent
active
050352962
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a vehicle engine suspension device which comprises at least one pair of compressible engine cushions or pads connected to the engine and having supports intended for attachment to the seats of an engine bed plate, wherein the cushions are inclined towards one another in the direction of compression and the seats are inclined correspondingly.
It is conventional to position the engine cushions of each engine cushion pair located on respective opposite sides of a vehicle engine--as seen in its axial direction--such that said cushions are inclined towards one another in the direction of compression and therewith cause the natural frequencies of the enqine to lie within a narrower freguency band. In the case of known installations of this kind, the distance between the cushion supports in the absence of compressive load is equal to the distance between the seats on the chassis frame in the engine compartment. When the engine is lowered into the engine compartment and the supports come into contact with the seats, the cushions are subjected to shear forces as a resuIt of the weiqht exerted thereon by the engine. Engine cushions, however, and particularly liquid-damped cushions, are primarily constructed to take up solely compression forces and their useful life will be shortened considerably if the cushions are subjected to excessive shear forces.
The object of the present invention is to provide a vehicle engine suspension system of the kind described in the introduction in which the engine cushions will be subjected solely to compression forces in the direction of symmetry.
This object is achieved in accordance with the invention in that the distance between the supports in the unloaded expanded condition of the cushions is greater than the distance between the seats and that the compressibility of the cushions is adapted to the weight of the engine so that, when the cushions are subject to the static weight of the engine, the distance between the supports is equal to the distance between the seats so as to ensure that the cushions are essentially free from shear forces when compressed by the engine.
Since the cushions are inclined towards one another, the lower ends of the cushions will move progressively closer together as the cushions are compressed.
By suitably adapting this mutual spacing in the absence of load to the degree of compressibility attainable and to the dead weight of the engine, it can be ensured that the compression resulting from the engine weight will be precisely that required to decrease the distance between the supports to an extent such that said distance will be equal to the distance between the seats when the cushions are subjected to the static weight of the engine. By "engine weight" is meant here and in the following that part of the weight of the entire engine assembly, i.e. engine, clutch and gear box, which is to be supported by the cushions.
The invention will now be described in more detail with reference to exemplifying embodiments thereof illustrated in the accompanying drawings, in which
FIG. 1 is a perspective view of a complete engine suspension system intended for a transversely positioned engine,
FIG. 2 is a side view of engine cushions and mounting, with the engine illustrated schematically, and
FIG. 3 is an enlarged view of the circled area in FIG. 2.
The engine suspension illustrated in FIG. 1 includes an intermediate frame 1 which is intended to be mounted on the vehicle chassis with the aid of resilient vibration-damping bushes 2, one at each corner of the frame. The frame 1 carries the engine 3 together with the gear box 4 and the vehicle steering transmission 5.
A pair of dampened engine cushions 6, 7 are mounted between the engine 3 and the frame 1, in front of and behind said engine respectively as seen in the direction of the vehicle long axis. The main function of the cushions is to dampen vertically acting engine movement and vibrations and will suitably be of the liquid-damped kind. The cushions are placed on respective sid
REFERENCES:
patent: 3132830 (1964-05-01), Adloff
patent: 4240517 (1980-12-01), Harlow et al.
AB Volvo
Mitchell David M.
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