Machine element or mechanism – Elements – Cams
Patent
1991-07-31
1994-10-25
Luong, Vinh T.
Machine element or mechanism
Elements
Cams
74 54, 74567, F16H 5306
Patent
active
053578279
ABSTRACT:
A cam assembly and method for providing a substantially constant load to a motor that drives the cam assembly. A torque compensated cam assembly (142,300) includes a plurality of tracks (140,150,152/310,312,314) that are profiled with a surface that varies radially as the cam rotates, thereby actuating cam followers, each of which rolls along a different track. A tangential force developed by the cam followers as they move over rapid radial changes in the surfaces of the tracks produces a total net torque that at times tends to aid the rotation of the cam and at times tends to impede its rotation. The cam is used in a volumetric pump (30) that accurately delivers a desired volume of fluid at a desire rate. To assist in maintaining the accuracy of these parameters, the torque compensated cam assembly presents a substantially constant load to a motor (146,304) that drives the cam. In one embodiment, the cam assembly includes a torque compensation track (170/316) disposed at one end of the cam, and in another embodiment, the torque compensation track is disposed circumferentially around the cam. A torque compensation roller (172,320) is biased against the torque compensation track by a flexure (174), providing a force that develops the required compensating torque. The profile of the torque compensation track is defined so as to produce a torque that is substantially equal in magnitude, but opposite in the direction, that it tends to rotate the cam assembly, compared to the net torque developed by the cam followers.
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Physics Parts I & II, Halliday Resnick, pp. 261 and 275, John Wiley & Sons, Inc. Publisher (1967).
Lawless Michael W.
Natwick Vernon R.
Abbott Laboratories
Luong Vinh T.
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