Planetary gear transmission systems or components – Differential planetary gearing – Differential or nondifferential planetary combined with...
Reexamination Certificate
1999-07-27
2001-10-02
Marmor, Charles A (Department: 3681)
Planetary gear transmission systems or components
Differential planetary gearing
Differential or nondifferential planetary combined with...
C475S016000, C074S117000, C074S119000, C074S143000
Reexamination Certificate
active
06296589
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a stepless speed variator, especially to a stepless speed variator incorporated with a gear engaging orientational ON-OFF device.
2. Description of the Background Art
Along with the increasing development of engineering technique, the application of speed variatiors becomes more and more extensive. There have been a plurality of stepless speed variators used as mechanical, electrical (thyristor speed adjustment), and hydraulic (hydraulic motor speed adjustment), etc. The electrical and the hydraulic speed variators have rather narrow range of speed variation, high loss of efficiency and during variation they can not arrive at the result of inversely proportional torque output from any switching of torque and rotary speed. Among the mechanical speed variators there have been frictional wheel type, belt chain type and sleeve pawl type, etc., which primarily apply frictional force to transmit motion and power. Due to lower efficiency and limited power transmission of the frictional transmission there exists currently no technique in stepless speed variations with high efficiency and large power transmission by means of friction-drive. It is well known in practice that gear engaging variators allow high efficiency for large power transmission. However, up to the present it has not been possible to produce stepless speed variators in the way of gear engaging transmission without utilization of friction drive. This has become a difficult subject in the world.
And, up to now the self-locking feature of worm and worm wheel engagement transmission has still not yet obtained proper exploitation in the machinery industries, formerly only the ever going feature of clockwise and counterclockwise inputs of worm is known. However, the valuable feature and applied technique of its orientational ON-OFF performance is still not yet attached great importance by people.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a gear engaging orientation ON-OFF device for realization of a stepless speed variator, that is, the realization of a stepless speed variator is by means of a gear engaging orientational ON-OFF device provided by the present invention without utilization of friction drive.
Since years of investigation, the inventor has discovered the orientational ON-OFF performance in worm and worm wheel engaged transmission and made a so-called orientational ON-OFF device with gear engaging transmission to realize a stepless speed variator without utilization of friction drive.
The orientational ON-OFF device provided by the present invention comprises a driving worm, a driven worm, a pair of driving and driven gears, and a worm wheel, wherein the driven worm has a projecting portion at the end portion of the driven worm shaft; the driven gear has a shaft hole in the center portion thereof and is provided with a projecting portion in the shaft hole; the driving worm and the driven worm are equal in spiral direction, spiral angle, number of teeth and the module, and respectively mounted parallel and in engagement with the worm wheel; the driving gear and the driven gear are equal in number of teeth and in the module, the driving gear is fixed on the shaft portion of the driving worm, the driven gear is rotationally mounted through the shaft hole on the end portion of the driven worm shaft so as for the projecting portion in the shaft hole to be in oppositely adjacent position at the side portions with the projecting portion of the end portion of the driven worm shaft; and the driving gear is engaged with the driven gear. In addition, between the two projecting portions which are in oppositely adjacent position at the side portions, there may set up a damping spacer in order to regulate the gap.
The stepless speed variator, realized by means of the orientational ON-OFF device provided by the present invention, comprises two sets of the orentational ON-OFF device, a power output device and a speed adjustment device, wherein the orientational ON-OFF device is the same as the above described.
The power output device comprises two sets of differential gear, and an output gear fixed on an output shaft, wherein each differential gear contains a tie frame, with two bevel gears as sun gears and two bevel gears as planet gears therein, the sun bevel gears are mounted oppositely on the left and right two sides in the tie frame, one of the sun bevel gears is fixed on the end of the shaft of the driving worm, while the other is fixed on the end of the output shaft; the planet bevel gears are free-rotationally mounted oppositely on the upper and lower two sides in the tie frame with their adjacent teeth in engagement with the sun gears; the tie frames are therefore in transmission connection through one of the sun bevel gears therein respectively with the end of the shaft of the driving worms at the side of the tie frames; the output shaft is fixed respectively at the two ends with the other sun bevel gears in the tie frames, the output gear is fixed in the middle of the output shaft, and at the lower side of the tie frames at a position adjacent to the output gear there is provided respectively a lug with a ball hinge fitted thereon. The tie frame supports the sun bevel gears and the planet bevel gears in the frame such that the four bevel gears can rotate smoothly engaging with each other in the tie frame.
The speed adjustment device comprises a push rod, two connecting rods, two links, an eccentric and a diving rushing mechanism, wherein the driving-pushing mechanism comprises a hand wheel, a rocker, and a lead screw handled by the hand wheel; the lead screw is mounted in the rocker which is placed at the lower side of the two differential gear tie frames; the left side of the rocker is pivotedly fixed on the housing as a fixed fulcrum by a pin; the push rod is provided with a central hole in its middle portion and a hole at one side of the central hole, and provided each with a ball hinge at the left and right two sides of its upper portion, the push rod is pivotedly mounted on the housing through the central hole at its middle portion with a pin and is located between the tie frames and the rocker; one end of the second link is pivotedly connected with the push rod at the side hole by a pin, the other end is pivotedly connected with a slider engaged with the lead screw; the two ends of the two connecting rods are connected respectively by ball hinges to the left and right side holes at the upper portion of the push rod, and the other two ends being respectively connected with the ball hinges on the lugs at the lower portion of the two tie frames; the eccentric is pivotedly mounted by pin shaft on the housing under the rocker; and, the two ends of the first link are pivotedly connected by pins respectively at the right side of the rocker and at the adjacent peripheral edge of the eccentric.
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patent: 3726150 (1973-04-01), Ikeda
patent: 3999444 (1976-12-01), Willman
patent: 4109551 (1978-08-01), Nemec
patent: 4762022 (1988-08-01), Johnshoy
patent: 4819512 (1989-04-01), Azuma et al.
Ho Ha
Marmor Charles A
Smith , Gambrell & Russell, LLP
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