Rotary shafts – gudgeons – housings – and flexible couplings for ro – Separate coupling device movable radially of axes of torque... – Coupling device has aperture or groove for receiving...
Patent
1991-04-15
1993-07-13
Stodola, Daniel P.
Rotary shafts, gudgeons, housings, and flexible couplings for ro
Separate coupling device movable radially of axes of torque...
Coupling device has aperture or groove for receiving...
F16D 304
Patent
active
052268527
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an Oldham coupling for connecting two parallel shafts. The Oldham coupling can be used, for example, for connecting an output shaft of a motor and a shaft of a detector.
BACKGROUND ART
In the conventional Oldham coupling, projections formed in the end surfaces of shafts, and grooves formed in the intermediate disk are machined to a high accuracy, and the grooves of the intermediate disk are formed so that the bottom walls of the grooves are extremely rigid, to ensure an accurate transmission of a rotation of one shaft to the other.
However, the projections of the shafts and the side surfaces of the grooves of the intermediate disk are abraded in an extended period of operation due to the sliding movement of the projections and the intermediate disk relative to each other, and consequently, the clearances between the projections and the grooves increase to cause a loss of motion, which deteriorates the accuracy of the rotation.
DISCLOSURE OF THE INVENTION
Accordingly, an object of the present invention is to provide an Oldham coupling in which a clearance is not formed between the adjacent parts for an extended period of operation, so that an accurate transmission of a rotation can be achieved.
In view of the foregoing object, the present invention provides an Oldham coupling for connecting two shafts, comprising projections formed respectively in one end surface of each shaft and an intermediate disk provided with mutually perpendicular grooves respectively in the opposite side surfaces thereof, the width of the groove formed in one of the side surfaces adjacent to the end surface of one of the two shafts being slightly smaller than that of the projection of the corresponding shaft, and the width of the groove formed in the other side surface being slightly smaller than that of the projection of the other shaft, and the bottom walls of the grooves being made from an elastic material.
The elastic bottom walls of the grooves of the intermediate disk enable each of the projections of the shafts having a width slightly greater than that of the corresponding groove to be pressed in the corresponding groove. The projection thus pressed in the groove, and slightly expanding same, is kept in close contact with the side surfaces of the groove due to the resilience of the elastic bottom wall of the groove, namely, no clearance will be formed between the side surfaces of the groove and the projection even if the projection and the surfaces of the groove are abraded over an extended period of operation.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is a perspective view of an Oldham coupling in a preferred embodiment according to the present invention.
BEST MODE OF CARRYING OUT THE INVENTION
The present invention will be described in detail with reference to a preferred embodiment thereof illustrated in the accompanying drawing. Projections 16 and 18 having the shape of a rectangular prism are formed respectively in the respective end surfaces 11 and 13 of two shafts 10 and 12 extending axially in parallel to each other. An Oldham coupling for connecting the shafts 10 and 12 has an intermediate disk 14 provided with mutually perpendicular grooves 20a and 20b, respectively, in opposite side surfaces 18a and 18b thereof. The respective bottom walls 22a and 22b of the grooves 20a and 20b are relatively thin. The intermediate disk 14 is an elastic member formed of a plastic, such as ULTEM (Trade Name), by injection molding. Therefore, the interval between the side surfaces 24a of the groove 20a, and the interval between the side surfaces 24b of the groove 20b, can be elastically expanded. When forming the intermediate disk 14, the grooves 20a and 20b are formed in widths slightly smaller than those of the projections 16 and 18 of the shafts 10 and 12, respectively. The elasticity of the bottom walls 22a and 22b enables the projections 16 and 18 to be pressed into the corresponding grooves 20a and 20b, and thus the projection 16 is kept in close contact with the side
REFERENCES:
patent: 2892328 (1959-06-01), Templeton
patent: 3438221 (1989-05-01), Paulsen
Asaba Eiki
Kariya Isao
Fanuc Ltd.
Stodola Daniel P.
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