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Transmission gear train baffle

A technology of transmission and transmission housing, applied in the direction of gear transmission, gear lubrication/cooling, belt/chain/gear, etc., can solve problems such as excessive softness and efficiency loss

Active Publication Date: 2010-09-22
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hydraulic fluid on rotating parts has a mass that must be accelerated during engine acceleration as a loss in efficiency
[0006] In addition, splashing hydraulic fluid causes aeration of the hydraulic fluid
A high proportion of dissolved air in the hydraulic fluid can in turn lead to pump cavitation and excessive weakness in the force and displacement characteristics of the hydraulic actuator

Method used

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  • Transmission gear train baffle
  • Transmission gear train baffle
  • Transmission gear train baffle

Examples

Experimental program
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Embodiment Construction

[0065] refer to figure 1 , a portion of an exemplary automatic transmission is indicated generally at 10 . Transmission 10 is preferably a multi-speed automatic shifting power transmission. The transmission 10 is preferably a rear wheel drive transmission, but it should be understood that the transmission 10 could be a front wheel drive transmission without departing from the scope of the present invention. The transmission 10 generally includes a transmission housing 12 that houses a sump section 14 and a gear train section 16 .

[0066] The transmission housing 12 is preferably a cast metal shell that surrounds and protects the various components of the transmission 10 . The transmission housing 12 includes a plurality of bores, passages, shoulders and flanges to locate and support these components. More specifically, the transmission housing 12 defines an axially extending central cavity 18 including a front portion 20 and a rear portion 22 . The front portion 20 is pre...

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PUM

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Abstract

A transmission includes a transmission case, a rotatable component disposed within the transmission case, and a sump disposed below the rotatable component for storing a hydraulic fluid. A gear train baffle is disposed between the rotatable component and the transmission case. The baffle includes an outer surface, an inner surface defining a cavity that substantially encircles the rotatable component, and a plurality of tabs disposed radially outward from the outer surface. The plurality of tabs are in contact with the transmission case to prevent the baffle from rotating. A plurality of openings are located at a bottom portion of the baffle. The plurality of openings extend through the baffle between the inner surface and the outer surface. The hydraulic fluid from the rotatable component collects on the inner surface of the baffle and is directed out of the cavity through the plurality of openings into the sump.

Description

technical field [0001] The present invention relates to a transmission gear train baffle that reduces clearance between rotating components in the gear train and the transmission housing. 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 powertrain in a motor vehicle requires the use of hydraulic fluid for lubrication and cooling for continuous operation. More specifically, engines and especially automatic transmissions require lubrication and hydraulic fluid or oil to maintain their operation and extend their useful life. Hydraulic fluid is communicated throughout the transmission via hydraulic passages and controls. For example, a typical rear wheel drive planetary transmission structure includes two "sections": a barrel section that includes the gear train components and a sump section below the gear train that includes the hydraulic c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H3/00F16H57/04
CPCF16H57/0484F16H3/66F16H57/0423F16H57/0409Y10T74/2186
Inventor S·辛普森J·霍滕施泰因G·彻斯基P·R·加西亚
Owner GM GLOBAL TECH OPERATIONS LLC