Machine element or mechanism – Mechanical movements – Rotary to rotary
Patent
1982-05-13
1985-09-03
Staab, Lawrence
Machine element or mechanism
Mechanical movements
Rotary to rotary
74116, 74119, F16H 2112, F16H 2148, F16H 2900, F16H 2904
Patent
active
045384746
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to the structure of impulse type mechanisms for steplessly adjusting the speed of rotation, namely, it relates to the structure of an impulse variable speed device.
Though providing an adequate uniformity of rotation of an output shaft, the presently known impulse variable speed devices are complicated in their design, limited in the scope of speed control, and short-lived primarily due to an intensive wear of the free-wheeling clutches. The present invention is largely directed to the solution of these problems.
DESCRIPTION OF THE PRIOR ART
Known in the art is a design of an impulse variable speed device (USSR Inventor's Certificate No. 382 866, published 23.05.73, Int. Cl..sup.2 F 16H 29/04) comprising an input shaft rigidly connected with a carrier having the form of a fork wherein an intermediate shaft extending perpendicularly to the input shaft axis is received, a mechanism for converting a rotary motion of the input shaft into an oscillating motion of the intermediate shaft, and a mechanism for converting the oscillating motion of the intermediate shaft into a rotary motion of a driven member freely mounted on the input shaft.
The mechanism for converting the rotary motion of the input shaft into the oscillating motion of the intermediate shaft is constructed in the form of a fork, one end of which is pivoted to the intermediate shaft and the other end is coupled with a segment in mesh with a worm having a flywheel at its end.
The mechanism for converting the oscillating motion of the intermediate shaft into the rotary motion of the driven member is constructed as a differential pinion attached to the intermediate shaft and in mesh with a central wheel connected with the driven member through a free-wheeling clutch.
As the input shaft rotates, the intermediate shaft oscillates with respect to the carrier. This action takes place due to an angular adjustment of the fork of the mechanism for converting the rotary motion into the oscillating motion with respect to the input shaft. As this takes place, the central wheel rotates together with the input shaft and the carrier and at the same time oscillates due to the action of the differential pinion. The sum of non-uniform rotation is transmitted from the central wheel through the free-wheeling clutch to the driven member.
The amplitude of the oscillations of the intermediate shaft and correspondingly the speed of rotation of the driven member depend on the angle of inclination of the fork of the mechanism for converting the rotary motion into the oscillating motion to the input shaft.
The uniformity of rotation of the driven member can be achieved only when several prior art devices operate in parallel, which is a difficult task structurally and results in a considerable increase in overall dimensions of such a system of devices.
The structure of an impulse variable speed device disclosed in U.S. Pat. No. 3,561,290 and published in 1971, is less complicated.
The above impulse variable speed device comprises axially aligned input and output shafts. The input shaft is kinematically connected to a mechanism for converting a rotary motion of the input shaft into an oscillating motion of an intermediate link. The output shaft is kinematically connected to a mechanism for converting the oscillating motion of the intermediate link into a rotary motion of the output shaft.
The mechanism for converting the rotary motion into the oscillating motion comprises a carrier fixed on the input shaft and a rotating half-ring, one end of which is immovable while the other end is connected to a unit for moving it along the axis of rotation of the carrier; a stationary guide connecting the immovable and movable ends of the half-ring; and an intermediate link made of rods arranged in parallel relationship to the axis of rotation of the carrier and provided with racks in mesh with spur gears supported on the carrier at one end and with rollers alternately establishing a contact with said half-ring and the stationary gui
REFERENCES:
patent: 975437 (1910-11-01), Kunkel
patent: 1141228 (1915-06-01), Bissell
patent: 3073173 (1963-01-01), Immel
patent: 3525267 (1970-08-01), Hofmann
patent: 3561290 (1971-02-01), Ruck
Besedin Vladlen L.
Birjukov Boris N.
Dzjuba Vladimir F.
Bednarek Michael D.
Odessky Politekhnichesky Institut
Staab Lawrence
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