FR2475660A1 - Automatically locking differential gear train - uses floating sprung spoked dog-wheel between double crown wheel and each output pinion - Google Patents

Abstract

The differential gear train locks automatically when no torque imbalance exists between the co-axial output shafts (d,e). The locking or dogging components are relatively small with enhanced contact areas, and the system may be incorporated in conventional differential units. Crown wheel (g) receives input drive, being built onto a cage (f) containing a double crown wheel (a) with the output pinions. Two similar dogging wheels (b,c) interpose pinions and wheel, comprising hub blocks with radial spoked of a double gear tooth cross-section, and being connected by a pin (h) in a part circular slot hole (s). Springs tend to move the wheels into engagement with the respective pinions, pin (h) in slot-hole (s) permitting some relative rotation of the wheels.

Description

 Automatic locking device intended to guarantee the propulsive role of the wheels of the same driving axle by eliminating their interdependence due to the cross-type differential.

 Motor vehicles likely to be immobilized by any lack of grip, sometimes benefit from a "differential lock" device, either automatic or manual, the function of which must never exceed the precise moment when the interdependence of wheels is harmful to propulsion. This results in an expensive study, of additional organs and permanent discrimination between the main organs of vehicles equipped or not with such organs.

 This automatic locking device, on the other hand, takes pure and simple nt, the dimensions of conventional organs, while ensuring that under any circumstances: lack of adhesion; breaking of a wheel shaft; wheel torn off or lifted; the two tree outlets remain in engagement. It is only as a result of the difference in speed, following a turn, the wheel corresponding to the large radius, deliberately acquires its own speed.

 The double crown (a) integral with the large crown, poses on each of its sockets, concentrically and symmetrically 8 notches. On the same axis and on each side of this double euronne are arranged tree outlets (d and e) lined with 2 times more notches, so that between the double crown and the tree outlets, can be accommodate 2 stars (b and c) with 8 nipples.

These stars are shaped so that they can be stored in the intervals of the notches in the double crown and allow, for example, that (d) can rotate freely in the direction of movement when it is outside a curve. : figure 1.

This is achieved by the 2 fingers (h) uniting the 2 stars and allowing them an axial and radial clearance limited to the offset necessary to force the one above, that is to say that on the outside of the turn, to s '' immobilize just between the notches and let yourself be pushed aside by the faster shaft exit figure 1 for a turn to D.

 In order to ensure that at least one of the wheels remains in grip, 4 springs (i) housed in hollow spacers act in opposite directions against the stars (b 'and c).

 The device which is the subject of the invention can be fitted to any motor vehicle, but particularly "all terrain" and competition cars, because of the constant grip which it provides and of the righting torque due to the fact that in a swerve, only the inner wheel remains driving.

REFERENCES a: Double crown b: Left star c: Right star d: Left shaft output e: Right shaft output f: Differential cage g: Large crown h: Union finger

Claims (2)

 1. Automatic differential locking device, characterized by the fact that its clutching members are small and have an increased contact surface.  2. Device according to claim 1, characterized in that its assembly can occupy exactly the same place as a conventional system with the same wheel shafts.