| 摘要 |
<p>This invention is described in connection with a preferred differential gear mechanism utilizing two substantially identical gear sets. Each set has a central worm or traction gear, sometimes called a side gear, adapted to be keyed to one of the driven shafts leading either to a drive wheel of an automotive vehicle; or, in a transfer case, one driven shaft leads to a front axle and the other to a rear axle of a four-wheel drive vehicle. Each of these side gears is in mesh with a plurality of transfer gear complexes, in the present case there being three, each complex having located centrally thereof a worm wheel in mesh with the side gear and having a reversible balancing gear at each end of the worm wheel. In use, the balancing gears in one set are in mesh with the balancing gears of the other set. The present invention provides a generally cylindrical pin long enough to enter into receiving bores in the case housing the two gear sets in final assembly whereby, if the housing is in two halves, the pin acts as a dowel pin and constitutes a press fit during assembly of the parts. In different embodiments, each of the gear complexes has an axial pin about which it rotates, and this axial pin extends into the associated case portion in which it rotates on each side of the transfer gear complex. The pin of this invention is so positioned that it prevents endwise movement of such a shaft in one direction at least, while permitting free rotation of said shaft.</p> |
