Automotive transmission

• US 4,080,848 A
• Filed: 05/24/1976
• Issued: 03/28/1978
• Est. Priority Date: 07/01/1974
• Status: Expired due to Term

• Current Assignee: BorgWarner Incorporated
• Original Assignee: BorgWarner Incorporated
• Inventors: Smirl, Richard L.
• Primary Examiner(s): Scott, Samuel
• Assistant Examiner(s): Chandler, Lance W.
• Application Number:
  US05/689,424
• Time in Patent Office: 673 Days
• Field of Search: 74/758, 74/759, 74/762, 74/763, 74/701, 74/695
• US Class Current: 475/280
• CPC Class Codes: F16H 3/66 composed of a number of gear trains without drive passing from one train to another

Abstract

An automotive transmission having a planetary gear set with friction clutches and brakes controlling the gear sets to obtain four forward speed ratios and a single reverse speed ratio. The transmission includes an output gear mounted between the planetary gear set and the main input clutch to the gear set while another input clutch is provided on the other side of the planetary gear set from the output gear.

Claims

1. In a transmission mechanism;

an input shaft;

an output gear;

a planetary gear set having a pair of input sun gear elements, an input carrier element, an output carrier element connected to said output gear, and a pair of ring gear elements;

said carrier elements having pinion gears each meshing with one of said ring and sun gear elements;

two of said elements comprising reaction elements for said gear set;

first and second clutch mechanisms;

said clutch mechanisms each having portions connected to said input shaft;

said first clutch mechanism connected to said sun gears and engageable to connect said input shaft to said sun gears;

said second clutch mechanism connected to said input carrier element and engageable to connect said input shaft to the said input carrier element;

said output gear being located between said first clutch and said planetary gear set;

said second clutch located adjacent said planetary gear set on the opposite side thereof from said output gear;

one of said ring gear elements being connected to said output carrier element;

a brake mechanism for said input carrier element;

a brake mechanism for the other of said ring gear elements and a brake mechanism for said sun gears, whereby through selective engagement of pairs of said clutch mechanisms and pairs of said clutch and brake mechanisms, except said first clutch and sun gear brake mechanism pair and said second clutch and input carrier brake mechanism pair, a plurality of drive ratios are available through said gear set.

2. A transmission mechanism as claimed in claim 1 wherein said reaction elements comprise said input sun gear elements and said input carrier element and including an intermediate shaft extending through said transmission and connecting said input shaft to said second clutch mechanism.