US 8,617,023 B1Granted

Planetary gear train of automatic transmission for vehicles

AssigneeHyundai Motor Company

InventorsMyonghoon Noh, Hyu Tae Shim, Kangsoo Seo, Jae Chang Kook, Chang Wook Lee, Jongsool Park

Life of this patent

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Abstract

A planetary gear train of an automatic transmission may include a first planetary gear set including a first sun gear, a first planet carrier, and a first ring gear, a second planetary gear set including a second sun gear receiving an inverse rotation speed from the first ring gear, a second planet carrier, and a second ring gear selectively connected to the first planet carrier or the first ring gear, a third planetary gear set including a third sun gear selectively connected to the first planet carrier, the first ring gear, or the second ring gear, a third planet carrier, a third ring gear selectively connected to the first sun gear, three transfer gears engaging three rotation elements of the first planetary gear set with selected rotation elements, and five frictional elements selectively interconnecting the rotation elements or selectively connecting the rotation elements to a transmission housing.

Claims12

Dependent claims

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

a first shaft receiving torque of an engine;
a second shaft disposed in parallel with the first shaft;
a first planetary gear set disposed on the first shaft, and including a rotation elements thereof a first sun gear selectively operated as an output element or a fixed element, a first planet carrier directly connected to the first shaft and continuously operated as an input element, and a first ring gear operated as an output element;
a second planetary gear set disposed on the second shaft, and including as rotation elements thereof a second sun gear receiving an inverse rotation speed from the first ring gear, a second planet carrier directly connected to the second shaft, and a second ring gear selectively connected to the first planet carrier or the first ring gear;
a third planetary gear set disposed on the second shaft, and including as rotation elements thereof a third sun gear selectively connected to the first planet carrier, the first ring gear, or the second ring gear, a third planet carrier directly connected to the second shaft and an output gear, a third ring gear selectively connected to the first sun gear;
three transfer gears engaging three rotation elements of the first planetary gear set with selected rotation elements among the rotation elements of the second and third planetary gear sets;
and
five frictional elements selectively interconnecting the rotation elements of the first, second, and third planetary gear sets or selectively connecting the rotation elements to a transmission housing.

5 more elements

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

a first shaft receiving torque of an engine;
a second shaft mounted in parallel with the first shaft;
a first planetary gear set mounted on the first shaft, and including a rotation elements thereof a first sun gear selectively operated as an output element or a fixed element, a first planet carrier directly connected to the first shaft and continuously operated as an input element, and a first ring gear operated as an output element;
a second planetary gear set mounted on the second shaft, and including as rotation elements thereof a second sun gear receiving an inverse rotation speed from the first ring gear, a second planet carrier directly connected to the second shaft, and a second ring gear selectively connected to the first planet carrier or the first ring gear;
a third planetary gear set mounted on the second shaft, and including as rotation elements thereof a third sun gear selectively connected to the first planet carrier, the first ring gear, or the second ring gear, a third planet carrier directly connected to the second shaft and an output gear, a third ring gear selectively connected to the first sun gear;
a first transfer gear including a first transfer drive gear connected to the first ring gear and a first transfer driven gear connected to the second sun gear;
a second transfer gear including a second transfer drive gear selectively connected to the first planet carrier or the first ring gear and a second transfer driven gear connected to the third sun gear;
a third transfer gear including a third transfer drive gear selectively connected to the first sun gear and a third transfer driven gear connected to the third ring gear;
a first brake mounted between the first sun gear and the transmission housing;
a first clutch mounted between the first sun gear and the third transfer drive gear;
a second clutch mounted between the first planet carrier and the second transfer drive gear;
a third clutch mounted between the second ring gear and the second transfer driven gear;
and
a fourth clutch mounted between the first ring gear and the second transfer drive gear.

11 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/731,519Filed 31 Dec 2012
Priority: KR 10-2012-011995826 Oct 2012
Granted: 31 Dec 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

F16H 3/66
Gearings having three or more central gears: composed of a number of gear trains without drive passing from one train to another
F16H 2200/006
Characterised by the number of forward speeds: the gear ratios comprising eight forward speeds
F16H 2200/201
Characterised by the number of sets of orbital gears: with three sets of orbital gears
F16H 2200/2043
Characterised by the engaging friction means not of the freewheel type, e.g. friction clutches or brakes: with five engaging means