Multi-speed power transmission

• US 5,425,283 A
• Filed: 09/17/1993
• Issued: 06/20/1995
• Est. Priority Date: 09/17/1993
• Status: Expired due to Fees

• Current Assignee: General Motors Corporation (Motors Liquidation Co. GUC Trust)
• Original Assignee: General Motors Corporation (Motors Liquidation Co. GUC Trust)
• Inventors: Wehking, Jeffrey B.
• Primary Examiner(s): Marmor, Charles A.
• Assistant Examiner(s): KWON, TAI CHOON
• Application Number:
  US08/123,488
• Time in Patent Office: 641 Days
• Field of Search: 74/331, 74/333, 74/325, 74/359, 74/360
• US Class Current: 74/331
• CPC Class Codes: F16H 2200/0043 the gear ratios comprising four forward speeds
• CPC Class Codes: F16H 3/091 including a single countershaft
• CPC Class Codes: F16H 3/093 with two or more countershafts
• CPC Class Codes: F16H 3/10 with one or more one-way clutches as an essential feature
• CPC Class Codes: Y10T 74/19233 Plurality of counter shafts
• CPC Class Codes: Y10T 74/19242 Combined gear and clutch

Abstract

A countershaft type multi-speed power transmission has a plurality of gear meshes disposed on three axes including a forward final drive gear and a reverse final drive gear. Both the low forward ratio and the reverse ratio drive paths include a common one-way device. The gear meshes and a plurality of selectively operable friction clutches are positioned on shafting disposed on the three axes to provide a compact overall axial length for the transmission assembly.

Claims

1. A power transmission comprising:

an input means for transmitting power from a prime mover;

an output means including forward output gearing and reverse output gearing for delivering power to a vehicle drive wheel;

forward low ratio drive establishing means for providing a power transmitting path between said input means and said forward output gearing of said output means including,

an input gear drivingly connected with said input means,

one-way drive transmitting means having an input member and an output member,

forward clutch means selectively operatively connectible between the output member and the output means to establish a forward low ratio drive path;

reverse ratio drive establishing means for providing a power transmitting path between the input means and the reverse output gearing of the output means including,

said input gear,

said one-way drive transmitting means,

a reversing gear means drivingly connected with the output member,

and reverse clutch means selectively operatively connectible between the reversing gear means and the output means to establish a reverse ratio drive path.