Planetary gear train for an automatic transmission of a vehicle
A technology of automatic transmission and planetary gear train, applied in the direction of vehicle transmission, vehicle components, gear transmission, etc., can solve the problem of difficult to ensure the linearity of the stage ratio, the improvement of power performance and fuel economy will not be obvious, the engine drive Efficiency, poor driving performance of vehicles, etc.
Active Publication Date: 2020-07-07
HYUNDAI MOTOR CO LTD
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[0010] However, since the conventional eight-speed automatic transmission has a gear ratio range of 6.5 to 7.5 (ratio range is an important factor used to ensure the linearity of the gear ratio), the improvement in power performance and fuel economy will not be obvious
[0011] In addition, if the gear ratio range of the eight-speed automatic transmission is greater than 9.0, it is difficult to guarantee the linearity of the step ratio
Thereby, the driving efficiency of the engine and the drivability of the vehicle will be deteriorated, therefore, it is necessary to develop a high-efficiency automatic transmission with at least nine forward speed gears
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[0052] The following description is only exemplary and not intended to limit the invention, application or use. It should be understood that throughout the drawings, corresponding reference numerals indicate like or corresponding parts and features.
[0053] However, parts not related to the description will be omitted in order to clearly describe the exemplary embodiments of the present invention, and like reference numerals designate like or analogous elements throughout the specification.
[0054] In the following description, since the names of the components are the same as each other and their order is not particularly limited, the names of the respective components are divided into first, second, etc. to distinguish the names.
[0055] figure 1 is a schematic diagram of a planetary gear train according to a first exemplary embodiment of the present invention.
[0056] see figure 1 , a planetary gear train includes: the first planetary gear set PG1, the second planeta...
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A planetary gear train of an automatic transmission for a vehicle is disclosed. The planetary gear train may include: an input shaft receiving torque of an engine; an output shaft outputting changed torque; a first planetary gear set including first, second, and third rotation elements; a second planetary gear set including fourth, fifth, and sixth rotation elements; a third planetary gear set including seventh, eighth, and ninth rotation elements; a fourth planetary gear set including tenth, eleventh, and twelfth rotation elements.
Description
[0001] Cross References to Related Applications [0002] This application claims priority and benefit from Korean Patent Application No. 10-2016-0007779 filed on January 21, 2016, which is hereby incorporated by reference in its entirety. 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. Background technique [0004] The statements in this section merely provide background information related to the present disclosure and may not constitute prior art. [0005] Generally, automatic transmissions implementing more speed gears have been developed to improve fuel economy and improve drivability. [0006] Such an automatic transmission realizing more speed gears must improve power performance and transmission efficiency in accordance with downsizing of the engine. Specifically, it is desirable to develop a high-...
Claims
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IPC IPC(8): F16H3/66
CPCF16H3/66F16H2200/0069F16H2306/00F16H2200/0073F16H2200/2012F16H2200/2048
Inventor 李炅勋鞠再昌黄铜焕黄圣旭金钟洙张祐槙池晟旭金千玉赵源珉权贤植朴钟述金振硕金兑桓
Owner HYUNDAI MOTOR CO LTD