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Planetary gear train of automatic transmission for vehicle

A technology of automatic transmission and planetary gear train, applied in the direction of vehicle gearbox, vehicle components, gear transmission, etc., can solve the problem of engine driving efficiency decline in vehicle drivability, difficulty in ensuring the linearization of the inter-stage ratio, and low fuel economy and other problems, to achieve the effect of improving the rhythm of engine speed and ensuring linearization

Active Publication Date: 2017-03-22
HYUNDAI MOTOR CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0009] However, since a conventional 8-speed automatic transmission has a ratio span of 6.5-7.5, it may not improve fuel economy much
[0010] In addition, if the 8-speed automatic transmission has a gear ratio span greater than 9.0, it is difficult to ensure the linearization of the stage ratio
Therefore, the driving efficiency of the engine and the drivability of the vehicle may decrease, making it necessary to develop a highly efficient automatic transmission that realizes at least nine forward speed gears

Method used

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  • Planetary gear train of automatic transmission for vehicle
  • Planetary gear train of automatic transmission for vehicle

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Embodiment Construction

[0030] Reference will now be made in detail to various embodiments of the invention, examples of which are illustrated in the accompanying drawings and described below. While the invention has been described in conjunction with exemplary embodiments, it will be understood that present description is not intended to limit the invention to those exemplary embodiments. On the contrary, the invention is intended to cover not only the exemplary embodiments, but also various alternatives, modifications, equivalents and others, which may be included within the spirit and scope of the invention as defined by the appended claims. implementation plan.

[0031] figure 1 is a schematic diagram of a planetary gear train according to various embodiments of the present invention.

[0032] see figure 1 , the planetary gear train according to various exemplary embodiments of the present invention includes: first, second, third and fourth planetary gear sets PG1, PG2, PG3 and PG4 arranged on...

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Abstract

The present invention relates to a planetary gear train for an automatic transmission of a vehicle, which may include an input shaft that receives a torque of an engine, an output shaft configured to output a changed torque of the engine, a first planetary gear set, which comprises a first rotating element, a second rotating element and a third rotating element; a second planetary gear set comprising a fourth rotating element, a fifth rotating element and a sixth rotating element; a third planetary gear set comprising a seventh rotating element, an eighth rotating element and a ninth rotating element; and a fourth planetary gear set comprising a tenth rotating element, an eleventh rotating element and a twelfth rotating element. By achieving nine forward speed gears and a reversing gear and extending the gear ratio span, and by ensuring linearization of the shift ratio, improved power transmission performance and fuel economy are improved.

Description

[0001] Cross References to Related Applications [0002] This application claims priority from Korean Patent Application No. 10-2015-0129856 filed on September 14, 2015, the entire contents of which are hereby incorporated by reference for all purposes. technical field [0003] The present invention relates to an automatic transmission for a vehicle. More specifically, the present invention relates to a planetary gear train of an automatic transmission for a vehicle that realizes nine forward speed steps and expands a gear ratio span using a minimum number of constituent elements, and ensures linearity of the shift ratio , resulting in improved power delivery performance and reduced fuel consumption. Background technique [0004] Rising oil prices in recent years have led to unrestricted competition to improve fuel efficiency. [0005] Therefore, studies are being conducted on engines to reduce weight and improve fuel efficiency by downsizing, and to ensure both operabilit...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H3/66
CPCF16H3/66F16H2200/0065F16H2200/0082F16H2200/2012F16H2200/2046
Inventor 权贤植鞠再昌黄铜焕黄圣旭李昌郁池晟旭赵源珉朴钟述李炅勋金钟洙
Owner HYUNDAI MOTOR CO LTD
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