Motor vehicles – With fluid or mechanical means to accumulate energy to power...
Patent
1990-08-22
1992-12-01
Hill, Mitchell J.
Motor vehicles
With fluid or mechanical means to accumulate energy to power...
60415, 138 31, 180242, 180302, 180305, 180307, 180308, B60K 900, F04B 4900
Patent
active
051672928
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a motive power unit, in particular for automobile vehicles, and is more particularly concerned with a motive power unit of this kind equipped with a hydrostatic transmission device.
2. Description of the Related Art
A conventional hydrostatic transmission device usually comprises at least one pump feeding a liquid, usually oil, into a volumetric hydraulic motor. The piston of the pump can be operated by a heat engine, usually an internal combustion engine. EP disclosure 0 044 252 discloses such an arrangement. In a system of this kind regulation means are provided for adapting the flowrate of one of the two subsystems if that of the other varies. This is achieved by changing its volumetric capacity, usually by varying the active stroke.
SUMMARY OF THE INVENTION
The invention is essentially concerned with a motive power unit combining an internal combustion engine and a specific hydrostatic transmission device.
In this line of thinking, the invention thus concerns a motive power unit, in particular for automobile vehicles, comprising an internal combustion engine, mechanically coupled to a hydrostatic transmission device comprising at least one piston of a pump driven by the internal combustion engine and a volumetric motor connected to be fed by said pump, characterised in that the compression chamber of the pump in which the piston moves contains or is in permanent communication with an elastic accumulator, and in that the latter comprises or is associated with means for adjusting its elasticity.
The elastic accumulator can with considerable advantage be disposed in alignment with the bore of the piston of the pump, that is to say in the body of the pump itself.
Numerous structurally different variants are feasible for implementing said elastic accumulator. In particular, the accumulator may exploit the elasticity of a gas trapped in a variable volume enclosure. It may equally well comprise a block of elastomer material. Use may also be made of the "elasticity" of a mobile assembly subjected to a magnetic field tending to stabilise it in a given position and in this way make use of a magnetically produced elastic return force on the mobile assembly whenever it is moved away from its stable position. Finally, for simple applications it would also be feasible to use a simple arrangement of mechanical springs bearing on a mobile wall of the compression chamber of the pump. For most embodiments the invention provides the facility to modify also the stiffness of the elastic accumulator. To be more precise, for a given machine the ranges of variation of the stiffness and the elastic calibration will be predetermined by structural characteristics.
Numerous advantages result in particular from the combination of a hydrostatic transmission device of this kind with a two-stroke engine with free travel piston(s).
Finally, the invention also concerns an automobile vehicle incorporating this type of motive power unit.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be better understood and other advantages of it will emerge more clearly from the following description relating to several possible embodiments of a hydrostatic transmission device, of a motive power unit and of an automobile vehicle, given by way of example only and with reference to the appended drawings in which:
FIG. 1 is a schematic representation of a pneumatic elastic reaction hydrostatic transmission device;
FIG. 2 is a schematic representation analogous to FIG. 1 of another embodiment of pneumatic reaction hydrostatic transmission device;
FIG. 3 is a schematic representation analogous to FIG. 1 of a further embodiment of pneumatic reaction hydrostatic transmission device;
FIG. 4 is a schematic representation of a still further embodiment using elastic reaction produced by an elastomer block;
FIG. 5 is a schematic representation of a still further embodiment using magnetic elastic reaction;
FIG. 6 is a schematic general view of a motive power unit in accordan
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Bernard Francois
Chavy Pierre
Moiroux Auguste
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