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Multi-speed countershaft transmission with a planetary gear set

A technology for planetary gear sets and intermediate shafts, applied to components with teeth, vehicle gearboxes, gear transmissions, etc., to reduce cooling requirements and improve fuel economy

Active Publication Date: 2008-01-30
GENERAL MOTORS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This causes the engine to operate at a specific point of fuel consumption during cruise which is not the point of optimum efficiency

Method used

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  • Multi-speed countershaft transmission with a planetary gear set
  • Multi-speed countershaft transmission with a planetary gear set
  • Multi-speed countershaft transmission with a planetary gear set

Examples

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Embodiment Construction

[0027] Referring to the drawings, wherein like numerals refer to like components, FIG. 1 shows a powertrain 10 including an engine 12 operably connected to a transmission 14 via a torque converter 16 . Torque converter 16 includes a pump portion 18 connected for rotation to an engine shaft 20 , an idler portion 22 secured to a stationary element such as a transmission housing or housing 24 , and a turbine portion 26 . Those of ordinary skill in the art will appreciate that the torque converter 16 is a fluid coupling that provides torque augmentation between the pump portion 18 and the turbine portion 26 . Turbine portion 26 is connected for rotation with an input member 28 of transmission 14 . The torque converter 16 includes a lock-up clutch 30 . When the lock-up clutch 40 is engaged, power flow from the engine shaft 20 is directly connected to the input member 28 , bypassing the hydraulic coupling and torque build-up of the pump section 18 and turbine section 26 .

[0028]...

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PUM

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Abstract

A transmission is provided that combines first and second countershafts with planetary gear sets and utilizes the first and second gear sets to provide a torque ratio. Each countershaft supports gears in no more than five coplanar intermeshing gear sets (in most embodiments no more than four coplanar intermeshing gear sets), thereby minimizing the overall length of the countershaft. The transmission provides reverse and at least nine forward speeds, and utilizes only eight torque-transmitting mechanisms.

Description

technical field [0001] The present invention relates to a multi-speed transmission having a first second countershaft and a planetary gear set. Background technique [0002] 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 run through the torque range multiple times. The number of forward gears available in the transmission determines the number of engine torque range repeats. Previously automatic transmissions had two gear ranges. This severely limits the vehicle's overall gear range, thus requiring a larger engine capable of producing a wide range of speeds and torques. This results in the engine operating at a specific fuel consumption point during cruise which is not the optimum efficiency point. Therefore, manual transmissions (countershaft transmissions) are the most popular. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H3/44
CPCF16H37/042F16H3/097F16H37/046F16H2200/0065F16H2200/0095Y10T74/19233Y10T74/19223
Inventor D·L·罗杰斯二世
Owner GENERAL MOTORS CORP
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