US 8,556,768 B2Granted

Planetary gear train of automatic transmission for vehicles

AssigneeHyundai Motor Company

InventorsJongsool Park, Tae Seok Seo, Hyukjun Lee

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Abstract

A planetary gear train of an automatic transmission may include an input shaft, an output gear, a first planetary gear set always outputting a negative rotation speed from a rotation speed input from the input shaft, a second planetary gear outputting the negative rotation speed input from the first planetary gear set or converting negative rotation speed into a positive rotation speed and outputting the positive rotation speed, a compound planetary gear set formed by third and fourth planetary gear sets and changing the rotation speed selectively through two paths and into nine forward speeds and one reverse speed, eight rotational members including two rotation elements connected to each other or one rotation element among the rotation elements of the first and second planetary gear sets and the compound planetary gear set, and a six friction members, and a transmission housing.

Claims10

Dependent claims

A planetary gear train of an automatic transmission for vehicles achieving multiple shift-speeds, the planetary gear train comprising:

an input shaft adapted to receive engine torque;
an output gear adapted to output a shifted torque;
a first planetary gear set having a first sun gear, a first planet carrier, and a first ring gear;
a second planetary gear set having a second sun gear, a second planet carrier, and a second ring gear;
a compound planetary gear set formed by combining a third planetary gear set having a third sun gear, a third planet carrier, and a third ring gear, and a fourth planetary gear set having a fourth sun gear, a fourth planet carrier, and a fourth ring gear;
a first rotational member consisting of the first sun gear and adapted to be directly connected to the input shaft;
a second rotational member consisting of the first planet carrier and adapted to be directly connected to a transmission housing;
a third rotational member consisting of the first ring gear and the second planet carrier;
a fourth rotational member consisting of the second sun gear and the third sun gear;
a fifth rotational member consisting of the second ring gear and adapted to be selectively connected to the transmission housing;
a sixth rotational member consisting of the third planet carrier and the fourth ring gear, and adapted to be selectively connected to the input shaft or to the transmission housing;
a seventh rotational member consisting of the third ring gear and the fourth planet carrier, and adapted to be directly connected to the output shaft;
an eighth rotational member consisting of the fourth sun gear and adapted to be selectively connected to the input shaft;
and
six friction members consisting of clutches and brakes, the clutches being interposed between a selected rotational member among the rotational members and the input shaft or between selected rotational members, and the brakes being;
interposed between a selected rotational member among the rotational members and the transmission housing.

13 more elements

A planetary gear train of an automatic transmission for vehicles, comprising:

an input shaft adapted to receive engine torque;
an output gear adapted to output a shifted torque;
a first planetary gear set having a first sun gear, a first planet carrier, and a first ring gear;
a second planetary gear set having a second sun gear, a second planet carrier, and a second ring gear;
a compound planetary gear set formed by combining a third planetary gear set having a third sun gear, a third planet carrier, and a third ring gear, and a fourth planetary gear set having a fourth sun gear, a fourth planet carrier, and a fourth ring gear;
a first rotational member consisting of the first sun gear and adapted to be directly connected to the input shaft;
a second rotational member consisting of the first planet carrier and adapted to be directly connected to a transmission housing;
a third rotational member consisting of the first ring gear and the second ring gear;
a fourth rotational member consisting of the second sun gear and the third sun gear;
a fifth rotational member consisting of the second planet carrier and adapted to be selectively connected to the transmission housing;
a sixth rotational member consisting of the third planet carrier and the fourth ring gear, and adapted to be selectively connected to the input shaft or to the transmission housing;
a seventh rotational member consisting of the third ring gear and the fourth planet carrier, and adapted to be directly connected to the output shaft;
an eighth rotational member consisting of the fourth sun gear and adapted to be selectively connected to the input shaft;
and
six friction members consisting of clutches and brakes, the clutches being interposed between a selected rotational member among the rotational members and the input shaft or between selected rotational members, and the brakes being;
interposed between a selected rotational member among the rotational members and the transmission housing.

13 more elements

A planetary gear train of an automatic transmission for vehicles, comprising:

an input shaft adapted to receive engine torque;
an output gear adapted to output a shifted torque;
a first planetary gear set having a first sun gear, a first planet carrier, and a first ring gear;
a second planetary gear set having a second sun gear, a second planet carrier, and a second ring gear;
a compound planetary gear set having a third sun gear, a fourth sun gear, a common planet carrier, and a common ring gear;
a first rotational member consisting of the first sun gear and adapted to be directly connected to the input shaft;
a second rotational member consisting of the first planet carrier and adapted to be directly connected to a transmission housing;
a third rotational member consisting of the first ring gear and the second planet carrier;
a fourth rotational member consisting of the second sun gear and the third sun gear;
a fifth rotational member consisting of the second ring gear and adapted to be selectively connected to the transmission housing;
a sixth rotational member consisting of the common planet carrier, and adapted to be selectively connected to the input shaft or to the transmission housing;
a seventh rotational member consisting of the common ring gear and adapted to be directly connected to the output shaft;
an eighth rotational member consisting of the fourth sun gear and adapted to be selectively connected to the input shaft;
and
six friction members consisting of clutches and brakes, the clutches being interposed between a selected rotational member among the rotational members and the input shaft or between selected rotational members, and the brakes being;
interposed between a selected rotational member among the rotational members and the transmission housing.

13 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/315,718Filed 9 Dec 2011
Priority: KR 10-2011-007478827 Jul 2011
Published: US 2013/0029799 A131 Jan 2013
Granted: 15 Oct 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

F16H 3/663
Composed of a number of gear trains without drive passing from one train to another: with conveying rotary motion between axially spaced orbital…
F16H 3/666
Composed of a number of gear trains without drive passing from one train to another: with intermeshing orbital gears
F16H 2200/0065
Characterised by the number of forward speeds: the gear ratios comprising nine forward speeds
F16H 2200/201
Characterised by the number of sets of orbital gears: with three sets of orbital gears