Power transmission system for vehicle

A power transmission and vehicle technology, which is applied in the direction of transmission box, transmission parts, transmission control, etc., can solve the problems of automatic transmission energy loss and other problems, and achieve the effect of reducing rotation resistance

Inactive Publication Date: 2008-01-23
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The automatic transmission of the related art disclosed in JP-A-2002-161973 may cause energy loss due to heat generated by the clutch drum agitating oil and due to increased rotational resistance to the clutch drum due to contact with the oil

Method used

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  • Power transmission system for vehicle
  • Power transmission system for vehicle
  • Power transmission system for vehicle

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Embodiment Construction

[0019] In the following description and accompanying drawings, the present invention will be described in detail with reference to exemplary embodiments.

[0020] FIG. 1 is a schematic diagram of an automatic transmission 10 used in a power transmission system 8 of a vehicle according to an embodiment of the present invention. FIG. 2 lists various operating conditions of the frictional engagement member or frictional engagement device when setting each gear. The automatic transmission 10 is suitable for a front-engine, front-wheel drive (FF) vehicle in which the transmission is placed transversely. The automatic transmission 10 has a first transmission device 14 and a second transmission device 20, both located on a common axis C within a transmission case 26 or mounted on a non-rotating part of the vehicle body. The first transmission device 14 includes a first single-tooth planetary gear train 12 as a main body. The second transmission device 20 is a Ravigneaux-type transm...

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Abstract

A power transmission system for a vehicle is provided, including: a housing that can reserve oil therein; and a rotational member rotatably supported within the housing, with a surface of the rotational member being partly contactable with a surface of the oil reserved in the housing, in which the surface of the rotational member partly contactable with the oil surface includes a non-contact surface that is not in contact with any power transmission members, the non-contact surface having an oil repellent section. When the surface of the rotational member contacts the oil surface, the oil repellent section repels the oil quickly. Therefore, the amount of oil, which adheres to and rotates with the rotational member agitating the oil, decreases. This reduces oil heat generation and rotational resistance to the rotational member.

Description

technical field [0001] The present invention relates to a power transmission system for a vehicle having a rotating part driven by a power source and capable of contacting oil stored in the power transmission system, and more particularly to reducing damage to the rotating part due to contact with the oil Rotational resistance and oil heat generation. Background technique [0002] In a power transmission system installed in a vehicle, a large number of rotating parts driven by a power source such as an engine are provided. These rotating parts include clutch drums and gears. Oil stored in the vertical bottom of the power transmission system is used as a lubricant for certain parts. Recent trends indicate that such drivetrains themselves are downsized relative to conventional drivetrains, however, the clutch drums of the transmissions in such drivetrains have increased diameters in order to increase torque transfer capacity. This results in a shortened distance between the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16D25/063F16D25/0638F16H57/02F16H57/04
CPCF16H57/041F16H57/0409F16H63/3026Y10T74/19991F16D25/0638F16D25/10F16D25/123
Inventor 中村和明渡边和之石和田健
Owner TOYOTA JIDOSHA KK
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