US 9,791,021 B2Granted

Transmission for vehicle

AssigneeHyundai Motor Company

InventorsJae Chang Kook, Kang Soo Seo, Won Min Cho, Myeong Hoon Noh, Seong Wook Ji, Wook Jin Jang, Seong Wook Hwang

Life of this patent

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Abstract

A transmission for a vehicle may include an input shaft, an output shaft, a first planetary gear set, a second planetary gear set, a third, planetary gear set, a fourth planetary gear set, provided to transfer a torque between the input shaft and the output shaft, and friction members, wherein each of the first, second, third, and fourth planetary gear sets includes three rotary elements and three of the friction members are each selectively connected to at least one of the at least three rotary elements of the first, second, third, and fourth planetary gear sets and control rotation of the rotary elements to achieve gear ratios of ten or more steps of forward shifting and one step of reverse shifting in a vehicle.

Claims10

Dependent claims

A transmission for a vehicle, comprising:

a first planetary gear set, a second planetary gear set, a third, planetary gear set, and a fourth planetary gear set;
and
friction members,
wherein the first planetary gear set includes:
a first rotary element of the first planetary gear set directly connected to an input shaft;
a second rotary element of the first planetary gear set operating as a selectively-fixed element by a first friction member of the friction members and selectively connected with a third rotary element of the second planetary gear set by a second friction member of the friction members and selectively connected with a first rotary element of the fourth planetary gear set by a third friction member of the friction members;
and a third rotary element of the first planetary gear set directly connected with a second rotary element of the second planetary gear set,
the second planetary gear set includes:
a first rotary element of the second planetary gear set being rotatable relative to a transmission case and selectively connected with the first rotary element of the fourth planetary gear set by a fifth friction member of the friction members;
and the second rotary element of the second planetary gear set selectively connected with a first rotary element of the third planetary gear set,
the third planetary gear set includes:
the first rotary element of the third planetary gear set selectively connected with the third rotary element of the second planetary gear set by a sixth friction member of the friction members;
a second rotary element of the third planetary gear set directly connected to the input shaft;
and a third rotary element of the third planetary gear set directly connected to an output shaft,
the fourth planetary gear set includes:
a second rotary element of the fourth planetary gear set directly connected to the output shaft and a third rotary element operating of the fourth planetary gear set as a fixed element.

13 more elements

A transmission for a vehicle, comprising:

a first planetary gear set, a second planetary gear set, a third planetary gear set, and a fourth planetary gear set;
an input shaft directly connected to a first rotary element of the first planetary gear set and a second rotary element of the third planetary gear set;
a first shaft directly connecting a second rotary element of the first planetary gear set, a first clutch, a second clutch, and a third clutch;
a second shaft directly connecting a third rotary element of the first planetary gear set, a second rotary element of the second planetary gear set, and a fourth clutch;
a third shaft directly connecting a first rotary element of the second planetary gear set and a fifth clutch;
a fourth shaft directly connecting a third rotary element of the second planetary gear set, the second clutch, and a sixth clutch;
a fifth shaft directly connecting a first rotary element of the third planetary gear set, the fourth clutch, and the sixth clutch;
a sixth shaft directly connecting a first rotary element of the fourth planetary gear set, the third clutch, and the fifth clutch;
an output shaft directly connecting a third rotary element of the third planetary gear set and a second rotary element of the fourth planetary gear set;
and
a transmission case connected with a third rotary element of the fourth planetary gear set and the first clutch,
wherein the first clutch is disposed for connecting and disconnecting the first shaft and the transmission case,
wherein the second clutch is disposed for connecting and disconnecting the first shaft and the fourth shaft,
wherein the third clutch is disposed for connecting and disconnecting the first shaft and the sixth shaft,
wherein the fourth clutch is disposed for connecting and disconnecting the second shaft and the fifth shaft,
wherein the fifth clutch is disposed for connecting and disconnecting the third shaft and the sixth shaft, and
wherein the sixth clutch is disposed for connecting and disconnecting the fourth shaft and the fifth shaft.

14 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/886,308Filed 19 Oct 2015
Priority: KR 10-2015-00815009 Jun 2015
Published: US 2016/0363189 A115 Dec 2016
Granted: 17 Oct 2017
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 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 2200/0069
Characterised by the number of forward speeds: the gear ratios comprising ten forward speeds
F16H 2200/2012
Characterised by the number of sets of orbital gears: with four sets of orbital gears
F16H 2200/2046
Characterised by the engaging friction means not of the freewheel type, e.g. friction clutches or brakes: with six engaging means