No-spin differential

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The no-spin differential from the manufacturer Dyneer / TracTech (today EATON) is used to drive the two wheels of an axle in slow-moving construction vehicles such as graders and scrappers. It is contrary to its name part differential , no differential gear , but it contains two claw couplings with which both shafts are rigidly coupled to the drive shaft (and rigid with one another) when driving straight ahead. When cornering, the clutch to the outer wheel is opened automatically. The vehicle is driven exclusively by the inner wheel. The outer wheel can turn faster without hindrance.

function

The central component of the no-spin differential is a ring driven in the same way as the differential carrier of a differential with claw teeth on both faces. From the sides, a claw ring, which is connected to the associated half axle shaft in a rotationally fixed manner, is pressed against the central claw ring with a helical spring surrounding the axle shaft. Both clutches are kept closed in this way. Within the claw teeth, there are further teeth arranged in a circle but beveled in the circumferential direction on the two coupling surfaces that belong together.

When cornering, a differential torque arises between the semi-axes, as a result of which the beveled teeth are pressed apart against the spring force. The outer coupling ring on the outside of the curve is pushed outwards and the wheel on the outside of the curve becomes idle. The clutch on the inside of the curve remains closed and the inside wheel is driven. Pushing could be done on both sides, but only takes place on the outside of the curve because the wheel turns faster here. The coupling ring connected to it rushes ahead and its fully positive claws lose contact with the counter claws (claw teeth have circumferential play). In contrast to the inside of the curve, there are no axial frictional forces between the claws that could hinder sliding. Constant snapping back of the outwardly shifted clutch ring is prevented by a synchronizer ring, so that the clutch can only be switched on again when it is synchronized.

Individual evidence

  1. ↑ a b Johannes Loomann: gear transmission , Springer, 1988, ISBN 3-540-18307-8 , p 352-353

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