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Final drive assembly with differential lock

  • US 20040053725A1
  • Filed: 09/22/2003
  • Published: 03/18/2004
  • Est. Priority Date: 10/04/2000
  • Status: Active Grant
First Claim
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1. An axle-drive unit for a motor vehicle having a first and a second driven axle which comprises a first and a second differential (18, 19) in a housing driven by an engine/transmission block (1), the first differential (18) dividing the torque fed to it between a first half axle (9) of the first driven axle (8, 9) and the second differential (19), and the latter furthermore dividing the torque fed to it between a second half axle (8) of the first driven axle (8, 9) and a power take-off (7) for the second driven axle (16, 17), the two differentials (18, 19) being spur-gear-type planetary gears with parallel axes, the sun wheels (32, 43) of which are in each case connected in terms of drive to the half axles (8, 9) of the first driven axle, and planet wheels (36, 38) of the two differentials (18, 19) meshing with their common ring gear (35), the one planet carrier (23) being connected in a rotationally fixed manner to the housing and the other planet carrier (40) being connected in terms of drive to the power take-off (7) for the second driven axle, wherein a) the housing (22) has a machined inner surface (50) which surrounds the ring gear (35) with little clearance (63), b) the ring gear (35) is so thin in the radial direction that it is deformed in a lobe-like manner (35*) by the radial component (FR) of the tooth forces exerted by the planet wheels (31, 36), c) its outer circumferential surface (60) thereby being placed against the inner surface (50) of the housing (22) in a manner producing friction at least locally, and a braking moment thereby acting on the ring gear (35).

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