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Transmission with mixed planetary layshaft structure

A multi-speed transmission, countershaft technology, applied in the direction of gear transmission, belt/chain/gear, mechanical equipment, etc., can solve the problems of increased complexity, size and cost of the transmission.

Active Publication Date: 2011-09-21
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the often added complexity, size and cost of such transmissions are competing factors that may hinder their use in certain applications

Method used

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  • Transmission with mixed planetary layshaft structure
  • Transmission with mixed planetary layshaft structure
  • Transmission with mixed planetary layshaft structure

Examples

Experimental program
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Embodiment Construction

[0072] Referring to the drawings in which like reference numerals refer to like parts, figure 1 A powertrain 10 is shown having an engine 12 (designated E), a combined layshaft and planetary transmission 14 , and a final drive mechanism 16 (designated FD). Engine 12 may be powered by various forms of fuel to improve efficiency and fuel economy for a particular application. These fuels may include, for example, gasoline, diesel, ethanol, dimethyl ether, and the like. Transmission 14 includes an input member 17 selectively in continuous communication with an output member of engine 12 , such as a crankshaft, via a torque converter. The transmission 14 also includes a planetary gear set 20 , five intermeshing gear sets S1 , S2 , S3 , S4 , S5 and a transfer gear set T1 as described below. The transmission 14 has a first intermediate member 49, a second intermediate member 50, a first layshaft 52, a second layshaft 54 ​​and an output member 19 connected to the final drive mechani...

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PUM

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Abstract

A transmission includes an input member, an output member, a first and a second intermediate member, and a planetary gear set, all of which are coaxial and define a first axis of rotation. A first and a second layshaft are arranged to define a second axis of rotation and a third axis of rotation, respectively. Each of five sets of intermeshing gears transfer torque from a respective one of the intermediate members to a respective one of the layshafts via engagement of different respective ones of nine torque-transmitting mechanisms. A set of transfer gears transfers torque from the layshafts to the output member. One of the torque-transmitting mechanisms grounds a member of the planetary gear set to a stationary member. The nine torque-transmitting mechanisms are engagable in different combinations to establish up to eight forward speed ratios and at least one reverse speed ratio.

Description

[0001] Cross References to Related Applications [0002] This application claims priority from Russian Patent Application No. 2010110530 filed on March 19, 2010, which is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates to a multi-speed planetary transmission having a countershaft, intermeshing gear sets, planetary gear sets and a plurality of torque transmitting mechanisms. Background technique [0004] A motor vehicle includes a powertrain consisting of an engine, a multi-speed transmission and a differential or final drive. A multi-speed transmission increases the overall operating range of the vehicle by allowing the engine to operate through its torque range multiple times. The number of forward speed ratios available in the transmission determines the number of times the engine torque range is repeated. Early automatic transmissions had two speed ranges. This severely limits the overall speed range of the vehic...

Claims

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Application Information

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IPC IPC(8): F16H3/44
CPCF16H3/006F16H37/046
Inventor K.B.萨拉曼德拉V.E.奥列什金M.拉哈文
Owner GM GLOBAL TECH OPERATIONS LLC