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Multi-speed automatic transmission

A technology for automatic transmissions and brakes, applied in vehicle gearboxes, multi-ratio transmissions, transmissions, etc., can solve problems such as friction loss

Inactive Publication Date: 2012-07-18
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such transmissions are known to have disadvantages
Two known and related disadvantages are complexity and cost
A corollary of this complexity is that frictional losses

Method used

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  • Multi-speed automatic transmission
  • Multi-speed automatic transmission
  • Multi-speed automatic transmission

Examples

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Embodiment Construction

[0068] The following description is merely exemplary in nature and is not intended to limit the disclosure, application, or uses.

[0069] see figure 1 , exemplifying the multi-speed, ie, nine-speed automatic transmission 10 according to the present invention with a lever diagram. A lever diagram is a schematic diagram of the components of an automatic transmission, where the planetary gear assemblies are represented by vertical bars or levers, and the various components of the planetary gear assembly, such as the sun gear, planet gear carrier, ring gear, are represented by nodes. The relative lengths of the vertical bars between the nodes represent the ratios between the components. Where a component of one planetary gear assembly is directly coupled to a component of another planetary gear assembly, the two levers may be combined into a single lever, which in this case has four nodes. Because of this direct coupling, the four planetary gear assemblies of the present invent...

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Abstract

The present invention provides a multiple speed automatic transmission having an input member, an output member and four planetary gear assemblies each including a sun gear, a planet gear carrier with a plurality of planet gears and a ring gear. The transmission also includes four friction brakes and two friction clutches. The transmission further includes a plurality of fixed or rigid connections. A first connection couples the ring gear of the first planetary gear assembly to the sun gear of the second planetary gear assembly. A second connection couples the planet gear carrier of the first planetary gear assembly to the planet gear carrier of the second planetary gear assembly. A third connection couples the ring gear of the third planetary gear assembly to the sun gear of the fourth planetary gear assembly. A fourth connection couples the planet gear carrier of the third planetary gear assembly to the planet gear carrier of the fourth planetary gear assembly. A fifth connection couples the ring gear of the second planetary gear assembly to the sun gear of the third planetary gear assembly.

Description

technical field [0001] The present disclosure relates to a multi-speed automatic transmission, and more particularly to a nine-speed automatic transmission having four planetary gear assemblies. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may or may not constitute prior art. [0003] A typical modern multi-speed automatic transmission includes multiple planetary gear assemblies and selectively engaged friction clutches and brakes to achieve various forward speed or gear ratios and reverse gears. [0004] Increasingly demanding objectives of economy, performance and efficiency continue to drive research and development of automatic transmissions. The result of such efforts has been a steady increase in the number of forward speed ratios or gear ratios available in automatic transmissions. [0005] While four or five speed automatic transmissions were once popular and considered to p...

Claims

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Application Information

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IPC IPC(8): F16H3/62
CPCF16H3/66F16H2200/2046F16H2003/442F16H2200/2012F16H2200/0065
Inventor J.M.哈特A.W.菲利普斯E.W.梅勒S.H.维特科普
Owner GM GLOBAL TECH OPERATIONS LLC
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