Gearbox with synchronized reverse gear for motor vehicles

Details Gearbox with synchronized reverse gear for motor vehicles Gearbox with synchronized reverse gear for motor vehicles

1999-08-23

2000-08-29

Wright, Dirk

Machine element or mechanism

Gearing

Interchangeably locked

192 5335, F16H 3089, F16D 2306

Patent

active

061091286

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

This invention relates to a gearbox with synchronized reverse gear for motor vehicles.


BACKGROUND OF THE INVENTION

It concerns, more particularly, a pinion gearbox, as described, for example, in document U.S. Pat. No. 4,640,141, in a transversal position comprising a transmission input shaft and an output shaft mounted mutually parallel in the gearbox housing and comprising several pairs of engaged pinions to shift on a corresponding number of headway transmission ratios, and a reverse gear axle, parallel to the transmission input and output shafts, whereon are arranged (a) two idler wheels, rotating freely against each other whereof one is engaged in a fixed pinion on the transmission input shaft and the other is engaged in a fixed pinion on the output shaft, and (b) a synchronizing device arranged between the idler wheels ensuring between them a permanent connection.
Such a gearbox design has the advantage of not being very cumbersome for a gearbox consisting of two main shafts. However, the reverse synchronizing devices known to date and of such a design are either fast but too cumbersome, or not very cumbersome but not fast enough, or yet fast and not very cumbersome but with significant effect at the clutch level and a high level of noise.


SUMMARY OF THE INVENTION

The object of the invention is to overcome these drawbacks by proposing, for a gearbox as described above, a reverse synchronization device that is not very cumbersome, is fast and makes it possible to engage the reverse gear without clutch grabbing and without noise.
With this end in view, the object of this invention is a gearbox with a synchronized reverse gear, in particular for motor vehicles, comprising a transmission input shaft and an output shaft mounted mutually parallel in the gearbox housing and comprising several pairs of pinions engaged to shift on a corresponding number of headway transmission ratios and a reverse gear axle parallel to the transmission input and output shafts, on which are arranged (a) two idler wheels rotating freely against each other, whereof one is engaged in a fixed pinion on the transmission input shaft and the other is engaged in a fixed pinion on the output shaft, and (b) a reverse gear synchronization device arranged between the idler wheels capable of ensuring between them a permanent connection. This device is remarkable in that it comprises (a) a jaw clutching sleeve coupled in rotation with one of the idler wheels and capable of moving axially by the action of a shift finger so as to engage the idler wheel with the wheel by coupling the sleeve inner gear teeth with the outer gear teeth of a jaw clutching ring integral with the idler wheel, and (b) a synchronizing ring coupled in rotation and arranged coaxial to the periphery of the sleeve, the latter being capable of moving axially relative to the synchronizing ring, the sleeve being equipped with a synchronization initiation system.
Furthermore, the gearbox of the invention comprises one or several of the following characteristics: the reverse gear shaft, that extend the side of the ring which faces the sleeve so as to cooperate respectively with a slot made axially on the latter; that of a lug to which it is connected by means of two inclined planes that create the synchronization ramps of the sleeve; inclined planes that form the synchronization ramps of the ring that are capable of cooperating with the inclined planes of the sleeve; with a complementary conical surface on a part that protrudes axially from the wheel in the direction of the sleeve; the center of the sleeve, the synchronization initiation system respectively comprises an initiation ramp and a counter-ramp arranged axially on the tooth, and capable of cooperating with an elastic snap ring; during the axial movement of the sleeve; center; the inner teeth of the sleeve, thus making it possible to increase the synchronization speed of the gears of the two idler wheels.


BRIEF DESCRIPTION OF THE DRAWINGS

The above-mentioned characteristics of the inven

REFERENCES:
patent: 4246993 (1981-01-01), Morscheck
patent: 4640141 (1987-02-01), Knodel et al.
patent: 4998445 (1991-03-01), Fujiwara
patent: 5934142 (1999-08-01), Wagoner

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