Gearbox with synchronized reverse gear for motor vehicles

  • US 6,109,128 A
  • Filed: 08/23/1999
  • Issued: 08/29/2000
  • Est. Priority Date: 10/31/1997
  • Status: Expired due to Fees
First Claim
Patent Images

1. Gearbox with synchronized reverse gear, in particular for motor vehicles, comprising a transmission input shaft (1) and an output shaft (2) mounted mutually parallel in the gearbox housing (3) and comprising a plurality of pairs of engaged pinions to shift on a corresponding number of headway transmission ratios, and a reverse gear axle (6), parallel to said transmission input (1) and output shaft, whereon are arranged two idler wheels (4, 5) rotating freely against each other, one of said idler wheels (4) being engaged in a fixed pinion (7) on the transmission input shaft (1) of said idler wheels, and the other (5) of said idler wheels being engaged in a fixed pinion on said output shaft (2), and a reverse gear synchronizing device (9) arranged between the idler wheels and capable of ensuring between them a permanent connection, wherein the reverse gear synchronizing device (9) comprises a jaw clutching sleeve (13) coupled in rotation with one of said idler wheels (5) and capable of moving axially by the action of a shift finger so as to engage the one idler wheel (5) with the wheel (4) by coupling said inner gear teeth (14) of said sleeve (13) with outer gear teeth (15'"'"') of a jaw clutching ring (15) integral with the idler wheel (4) and synchronizing ring (16) coupled in rotation and arranged coaxial to a periphery of said sleeve (13), the latter being axially movable relative to the synchronizing ring and that said sleeve (13) being equipped with a synchronizing initiation system (24, 25).

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