double enveloping worm/worm gear transmission. The double enveloping transmission has an increased torque capacity in comparison with standard worm differential gear mechanisms. This invention provides a worm differential unit including a differential case adapted to be driven rotationally. Pair of worm gears are supported by a differential case with each worm gear adapted for connection to a corresponding axle shaft. The worm gears are arranged co-axially and are independently rotatable. Furthermore, the present invention also enables heavy duty worm differentials to be made with little or no more increase in comparison with conventional differential worms. There could be two different types of operations. When the worm/worm gear transmission does not incorporate the self-lock feature, the motion could be provided from the drive shaft through enveloping worm and enveloping type worm gear to an output shaft or back from the output shaft to the drive shaft. The same operation is applicable for motion from the drive shaft to the driven shaft or from the driven shaft to drive shaft of the various other embodiments shown. Alternatively, when the worm/worm gear transmission does include the self-lock feature, rotary motion can be provided only from the drive shaft to the enveloping worm and through the enveloping type worm gear to the output shaft.
Jalchin Bons Popper,Kiryat Motzkin,Isrnel  The present invention relates in its broader aspects to cooperating wedges, and includes mating worms. The invention in one aspect includes self-locking in one way motion gears in which the function of the driving and the driven gear is not interchangeable. The purpose of this invention is to provide self-locking gears which has higher efficiency. It also provides self-locking without large reduction ratios. The Patent describes a worm drive consisting of two mating worms place almost parallel to each other, and also explains that the pitch angles of the two worms must be chosen according to certain rules inorder to obtain a worm drive which possesses self-locking and at the same time operates with a high efficiency. The invention of the above Patent is described and analysed. A motion transmitting device comprising: an input worm having worm threads on its circumferential surface, an output worm mounted with some axial play and having
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