Clutch with dual area piston and independent pressure control

A clutch and clutch assembly technology, applied in the field of clutches, can solve problems such as poor maximum torque control

Inactive Publication Date: 2009-09-02
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If this happens during a gear change, it can lead to poor maximum torque control

Method used

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  • Clutch with dual area piston and independent pressure control
  • Clutch with dual area piston and independent pressure control

Examples

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Embodiment Construction

[0018] The following description is merely exemplary in nature and is not intended to limit the invention, application or uses.

[0019] now refer to figure 1 , where a powertrain of a motor vehicle is shown, generally designated by reference numeral 10 . The motor vehicle powertrain 10 includes an engine and torque converter 12 , a multi-speed automatic transmission 14 , and conventional final drive components 16 .

[0020] Automatic transmission 14 includes an input shaft 17 connected to the engine and output of torque converter 12 , a planetary gear arrangement 18 , and an output shaft 19 connected to final drive assembly 16 . The planetary gear arrangement 18 includes a first planetary gear set 20 , a second planetary gear set 30 and a third planetary gear set 40 .

[0021] The first planetary gear set 20 includes a first sun gear 22 , a first ring gear 24 and a first planetary gear assembly 26 . The first planetary gear assembly 26 includes a first plurality of planet ...

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PUM

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Abstract

The present invention provides a clutch having two pistons, a first piston defining a first, smaller area and a second piston, defining a second, larger area. The separate pistons are independently provided with flows of pressurized hydraulic fluid from first and second independent modulatable control valves. Engagement of the clutch may be rapid by providing hydraulic fluid to the smaller area piston, provide greater engagement force by providing hydraulic fluid to the larger area piston or a combination of speed and force by utilizing modulated or unmodulated flows of hydraulic fluid to both pistons.

Description

technical field [0001] The present invention relates to a clutch having dual area pistons, and more particularly, to a clutch having two pistons of different areas and dual pressure valves for providing independent control of the pressure on each piston. The clutch has particular application in multi-speed automatic transmissions for motor vehicles. 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] The current design class of multi-speed automatic transmissions includes multiple planetary gear assemblies having a sun gear, planet carrier and ring gear interconnected by a permanent connection and selectively connected by a clutch or by a brake Make a fixed connection or ground (ie, connect to a fixed object). Clutches and brakes are typically engaged or actuated by hydraulic fluid pressure. [0004] The speed and force at which a clutch or br...

Claims

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Application Information

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IPC IPC(8): F16D25/12F16D25/0638
CPCF16D2048/0254F16D48/04F16D2048/0212
Inventor S·P·穆尔曼A·W·菲利普斯
Owner GM GLOBAL TECH OPERATIONS LLC
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