Range gearbox for motor vehicles

• US 4,976,671 A
• Filed: 06/07/1983
• Issued: 12/11/1990
• Est. Priority Date: 06/07/1982
• Status: Expired due to Term

• Current Assignee: AB VOLVO S 405 08 GOTEBORG SWEDEN
• Original Assignee: AB Volvo
• Inventors: Andersson, Sven
• Primary Examiner(s): Wright, Dirk
• Application Number:
  US06/501,905
• Time in Patent Office: 2,744 Days
• Field of Search: 74/785, 74/740, 192/18 R, 475/299
• US Class Current: 475/299
• CPC Class Codes: F16H 3/54 one of the central gears being internally toothed and the other externally toothed
• CPC Class Codes: F16H 3/78 Special adaptation of synchronisation mechanisms to these gearings
• CPC Class Codes: F16H 37/046 with an additional planetary gear train, e.g. creep gear, overdrive
• CPC Class Codes: Y10T 74/2186 Gear casings

Abstract

The invention relates to a range gearbox of planetary type, designed to be attached to a vehicle gearbox, a so-called base gearbox. The annulus or gear ring of the planetary gear set is non-rotatably joined to a shift sleeve, through which the annulus can be locked either to a coupling ring securely joined to the front housing end wall of the range gearbox, or to a coupling ring which is non-rotatably mounted on the input shaft of the range gearbox. The shift sleeve serves as an annulus carrier and displaces the annulus axially during the shift movement.

Claims

1. Vehicle transmission, especially for heavy trucks, comprising a base gearbox and a two-mode range gearbox of planetary gear type, both gearboxes having housings that are secured to each other and the base gearbox having an end wall facing the range gearbox, the base gearbox having a driven shaft that emerges from said end wall and serves as an input shaft of said range gearbox, said range gearbox having an output shaft, said input shaft carrying a sun gear which engages planet gears, which are carried by a planet gear carrier joined to said output shaft of the range gearbox and which engages an annulus, which can be locked by shift means either against rotation relative to said housings to establish reduction ratio drive between said shafts or against rotation relative to the shafts to establish direct drive between the shafts, characterized in that the annulus is rigidly joined to a shifting sleeve serving an an annulus carrier and arranged concentric with said input shaft, said shifting sleeve being axially displaceable between a first shift position in which it establishes a non-rotational coupling between the annulus and the said input shaft, and a second shift position in which it fixes the annulus to said base gearbox end wall facing the range gearbox.