Planetary gear transmission systems or components – Variable speed or direction transmission combined with... – Variable speed or direction is planetary transmission
Patent
1990-05-11
1991-07-23
Herrmann, Allan D.
Planetary gear transmission systems or components
Variable speed or direction transmission combined with...
Variable speed or direction is planetary transmission
475 6, 475199, F16H 3708
Patent
active
050339966
DESCRIPTION:
BRIEF SUMMARY
The present invention pertains to a continuously variable drive, comprising a drive motor, a differential with a first input shaft and a second input shaft and a driving shaft, a worm drive with a worm and a worm gear, as well as a member with controllable speed, wherein the drive motor is connected to the first input shaft, the worm gear to the second input shaft, and the worm to an output shaft of the member with controllable speed.
Such a drive is known from West German Offenlegungsschrift No. DE-OS 24,15,859. In this prior-art drive, a motor drives a cage with radially oriented bevel gears via an angular reducing gear. The bevel gears mesh with two ring gears. One of said ring gears is connected to a driving shaft. A servomotor drives the other ring gear via a reducing worm drive. The worm drive is designed so that it is still just self-locking. At constant speed of the drive motor, the speed of the driving shaft can be controlled by varying the speed of the servomotor with a relatively low power consumption. However, the power consumption of the servomotor strongly depends on the speed and the speed control until, to the point where stoppage or even a reversed direction of rotation is possible only with a great reduction in the angular gear. Consequently, the maximum driving shaft speed is substantially lower than the speed of the drive motor.
This prior-art drive is suitable, for example, for capstan engines or cranes, i.e., for applications in which the driving torque always acts in the same direction.
The basic task of the present invention is to further improve a drive of the class described in the introduction so that the driving shaft can be both driven and decelerated in both directions of rotation.
This task is accomplished in that, the drive having a second differential with a third input shaft and fourth input shaft, the second and fourth input shafts are driven so that the sum of the speeds of the second and fourth input shafts is constant at constant speed of the first and third input shafts, and that the first driving shaft is coupled nonrotatably to the second driving shaft so that one of the two differentials delivers a driving torque on the first driving shaft in one direction of rotation and the other differential [delivers a driving torque] in the opposite direction of rotation at constant direction of rotation and constant direction of an input torque to the first and third input shafts.
Embodiments of the present invention will be explained below on the basis of the drawing. Here,
FIG. 1 shows schematically a first embodiment and
FIGS. 2-4 show three other embodiments.
The drive according to FIG. 1 consists of a drive motor 1, two differentials 2 and 2', each with two input shafts 3, 4; 3', 4', and one driving shaft 5, 5', one worm drive 6, 6' with a worm 7, 7' and one worm gear 8, 8' connected to the respective shaft 4, 4', as well as a servomotor 10, 10' controlled by a control device 9, 9'. The two differentials 2, 2' are planetary drives and have a sun gear 15, 15' mounted on shaft 3, 3', a coaxial gear ring 16, 16' connected to said shaft 4, 4', as well as planetary gears 17 distributed over the circumference, of which only one is shown and which mesh with the respective sun gear 15, 15' and the respective toothed ring 16, 16'. The planetary gears 17, 17' are mounted rotatably on one pinion cage 18, 18' each. Said pinion cage 18, 18' is rigidly connected to the respective shaft 5, 5'. Said input shafts 3, 3' carry one gear 65, 65' each. Said two gears 65, 65' have equal number of teeth and mesh with a gear 67 mounted on the driving shaft 68 of said drive motor 1. Said input shafts 3, 3' are therefore driven by said motor 1 in the same direction and at equal speed.
Worm 7, 7' is mounted on said output shaft 19, 19' of the respective servomotor 10, 10'. The teeth of said worms 7, 7' have a pitch of between ca. 5.degree. and ca. 9.degree. and preferably ca. 7.degree.. Said drive motor 1 has an impulse transmitter 25 for a revolution indicator and each servomotor 10, 10' has anoth
REFERENCES:
patent: 1329319 (1920-01-01), Baker
patent: 1362360 (1920-12-01), Starr
patent: 4784017 (1988-11-01), Johnshoy
patent: 4819512 (1989-04-01), Azuma et al.
Herrmann Allan D.
Trousdell William O.
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