Method for assembling a planetary gear unit in a precise position

• US 6,663,531 B2
• Filed: 08/22/2002
• Issued: 12/16/2003
• Est. Priority Date: 03/23/2000
• Status: Expired due to Fees

• Current Assignee: ZF Friedrichshafen AG (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Original Assignee: ZF Friedrichshafen AG (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Inventors: Skrabs, Alfred
• Primary Examiner(s): PANG, ROGER L
• Application Number:
  US10/204,885
• Publication Number:
  US 20030036456A1
• Time in Patent Office: 481 Days
• Field of Search: 294/60, 745/30, 475/331, 475/335, 475/348
• US Class Current: 475/348
• CPC Class Codes: F16H 2057/085 Bearings for orbital gears
• CPC Class Codes: F16H 57/082 Planet carriers
• CPC Class Codes: Y10T 29/49888 Subsequently coating

Abstract

The method for precise position assembling a planetary gear unit consisting of a planetary gear, a planet shaft, a bearing, two thrust washers and two guide washers, especially for use in a planetary transmission for an automatic transmission of a motor vehicle consists in that the planetary gear unit is inserted within mean position tolerance, aligned and braced in a tool which tool has two displaceable stamps and two jaws with indented rings which jaws surround the stamps forming a ring and can be displaced independently of the stamps. By closing the tool, the indented rings clamp the guide washers until a constant pressure is exerted against them. The stamps are pressed against the ends of the planet shaft until they are forged.

Claims

1. A precision method for assembling a planetary gear unit having sun gear, at least one ring gear;

a planetary gear;

a planet shaft with pegs on front sides;

a bearing inserted between the planet shaft and the planetary gear; and

two thrust washers and two guide washers, which method comprises the following steps;

a) inserting the planetary gear unit aligned and braced in a tool (3, 4) with mean position tolerance via the ring gear (1) and the sun gear (2);

b) closing the tool, which has two displaceable stamps (3) coaxial with the planet shaft (8) and opposite to the two front sides thereof, the same as two jaws (4) with indented rings (12) surrounding the stamps in the form of a ring and displaceable independently of the stamps, until the indented rings (12) abut on the outer sides of the guide washers (5, 6) and clamp them;

c) further closing the tool until the indented rings (12) exert a constant pressure upon the outer sides of both thrust washers; and

d) pressing the stamps (4) against the ends of pegs (8a) of the planet shaft (8) with a force such that they are forged and thereby connect with positional precision, positively and without play the appertaining guide washers with the planet shaft.