Radial piston fluid engine
AssigneePoclain Hydraulics
InventorsJean-Pierre Badoureaux, Jean-Francois Cheylus
Life of this patent
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Abstract
The invention relates to an engine with radial pistons 9, which are coupled to elastic return means 25 for free-wheeling operation. Said elastic means are constituted by springs 25 whose number is equal to that of the pistons and by levers 21 mounted to pivot, each with respect to a piston 9, about an axis parallel to the axis of rotation 6 of the cylinder block 7, and equal in number to the springs, whereas each spring 25 is coupled to two levers 21, each lever constituting the bond for two springs 25. An application is the production of a hydraulic engine which is reliable and of simple design.
Claims6
A pressurized fluid engine comprising
- a cam surface having a wavelike configuration;
- a cylinder block mounted to rotate about an axis with respect to said cam surface and including a plurality of cylinders arranged radially therein with respect to the axis of rotation;
- a plurality of pistons each slidably mounted in a respective one of said cylinders and adapted to bear against the cam surface under the force of pressurized fluid;
- and
- an elastic device for returning said pistons to a retracted position inside their respective cylinders, said device including separate drawing springs at least equal in number to the number of pistons for biasing said pistons to said retracted position and a plurality of levers each mounted to pivot with respect to one piston about an axis parallel to the axis of rotation of the cylinder block, the number of said levers being equal to the number of said springs, and each lever constituting a link between two springs and each spring coupled to two levers.
A pressurized fluid engine comprising:
- a cam surface having a wavelike configuration;
- a cylinder block mounted for rotation about an axis with respect to said cam surface and including a plurality of cylinders arranged radially therein with respect to said axis;
- a plurality of pistons, each slidably mounted in a respective one of said cylinders and adapted to bear again the cam surface under the force of pressurized fluid;
- and
- an elastic device for returning said pistons to a retracted position within their respective cylinders, said device including a plurality of levers, each mounted to pivot with respect to one of said pistons about an axis parallel to the axis of rotation of the cylinder block, and a plurality of drawing springs for biasing said pistons to said retracted position in the absence of said force of pressurized fluid, the number of said springs being at least equal to the number of pistons and the number of said levers being equal to the number of springs, and each lever constituting a link between two springs and each spring coupled to two levers, whereby said plurality of drawing springs are effectively inoperative during operation of the engine when said plurality of pistons bear against the cam surface under the force of said pressurized fluid.
Dependencies are inferred from the claim text.