Motors: expansible chamber type – Three or more cylinders arranged in parallel radial or... – Radially disposed cylinders
Patent
1989-01-23
1990-12-04
Smith, Leonard E.
Motors: expansible chamber type
Three or more cylinders arranged in parallel radial or...
Radially disposed cylinders
92 58, F01B 106, F03C 1041, F04B 104
Patent
active
049744968
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a fluid motor. The fluid motor of the present invention is a radial piston motor and speed reducer, with high torque low speed output. The motor of the present invention can be used as a pump or as an hydraulic or pneumatic engine.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention there is provided a fluid motor characterized by a housing, at least one drive disc mounted within the housing, said drive disc having a generally curved outer surface, a central body disposed within said drive disc which central body is arranged to be attached to a fixed structure, at least one piston reciprocally mounted within the central body, a connecting rod connecting the piston to an eccentrically disposed crank, the eccentrically disposed crank being operatively connected to an eccentric nested, in the drive disc, the outer curved surface of the drive disc being formed of alternating crests and valleys and the housing having mounted in its interior adjacent its periphery a plurality of rollers which are arranged to engage with the curved surface of the drive disc, the number of rollers and the number of crests being different by at least one, and means being provided for feeding fluid to the or each piston to cause the or each piston to reciprocate so that the or each eccentric crank is caused to rotate about a respective central axis. The drive disc is caused to undergo a corresponding orbital movement by the corresponding eccentric or eccentrics and the housing is thus caused, through interaction between the curved surface of the drive disc and the rollers to rotate.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will now be described, by way of example with reference to the accompanying drawings, in which:
FIG. 1 is a front view, partly in section along the line A--A of FIG. 2, of a fluid motor in accordance with the present invention.
FIG. 2 is a front to rear section through the motor of FIG. 1; and
FIG. 3 is a section along the line B--B of FIG. 2 showing a valve mechanism .
DESCRIPTION OF THE INVENTION
In FIGS. 1 and 2, there is shown a fluid motor 10 comprising an outer housing 12 which is of generally cylindrical shape. The outer housing 12 is comprised of an outer curved wall 14 and a back wall 14a and a front cover 15 with a seal 15a between them.
A central body 16 is fixed and is arranged to be mounted to a fixed structure by means of threaded engagement of studs with apertures 18. The outer housing 12 is rotatably mounted to the central body 16 by means of angular contact bearings 20a and 20b. Further, the junctions between the housing 12 and the body 16 on the outer sides of the bearings 20a and 20b are sealed by oil seals 22a and 22b respectively.
Within the housing 12 there is contained a pair of drive discs 24 which are so mounted as to move simultaneously. A plurality of radially extending pistons 26 are located in the body 16 and are arranged to be reciprocated therein as will be described hereinafter.
The pistons 26 may be cylindrical in shape but other shapes are possible. Further, the heads of the pistons 26 point to the centre of the motor 10. Still further, any number of pistons 26 can be used although an odd number is preferred to minimize dynamic resonance. Also, it is preferred that the motor 10 contain at least three pistons 26 to maintain orbital movement readily although the motor 10 could contain a larger number of pistons 26 .
Each piston is reciprocally mounted within a chamber 27 in the body 16 and is sealingly engaged with its respective chamber by means of piston rings 28. Further, each piston 26 is pivotally connected to a ball headed connecting rod 30. A pin connection can alternatively be used. Each piston 26 is retained in place on its respective connecting rod 30 by a locking ring 32 which engages with the distal side of the ball of the connecting rod 30 and a hollowed out portion of the piston 26. A vent hole may be provided in the piston 26 to allow cylinder fluid pressure to
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Sea Shelf Engineering Pty. Ltd.
Smith Leonard E.
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