US 2005/0090362 A1Published application

Planetary-gear-type multiple-step transmission for vehicle

AssigneeToyota Jidosha Kabushiki Kaisha

InventorsAkiharu Abe, Akira Hoshino, Atsushi Tabata, Atsushi Honda, Terufumi Miyazaki, Hirofumi Ota

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Abstract

A planetary-gear-type multiple-step transmission including a stationary member, an input rotary member, an output rotary member, and first and second transmission units. The first transmission unit has first and second intermediate transmitting paths through which a rotary motion of the input rotary member is transmittable to the second transmission unit such that a speed of the rotary motion transmitted through the second intermediate transmitting path is lower than a speed of the rotary motion transmitted through the first intermediate transmitting path. The second transmission unit constitutes first, second, third and fourth rotary modules, each of which is provided by at least one of sun gears, carriers and ring gears of two planetary gear sets. The first rotary module is selectively connected to the second intermediate transmitting path, while being selectively connected to the stationary member. The second rotary module is selectively connected to the first intermediate transmitting path, while being selectively connected to the stationary member. The third rotary module is connected to the output rotary member. The fourth rotary module is selectively connected to the first intermediate transmitting path, while being selectively connected to the second intermediate transmitting path.

Claims17

Dependent claims

A planetary-gear-type multiple-step transmission for a vehicle, having a plurality of drive positions which are selectively established, said transmission comprising:

a stationary member;
an input rotary member;
an output rotary member;
a first transmission unit which is connected to said input rotary member;
and
a second transmission unit which is connected to said output rotary member,
wherein said first transmission unit has first and second intermediate transmitting paths through which a rotary motion of said input rotary member is transmittable to said second transmission unit such that a speed of the rotary motion transmitted through said second intermediate transmitting path is lower than a speed of the rotary motion transmitted through said first intermediate transmitting path,
wherein said second transmission unit includes two planetary gear sets each having a sun gear, a carrier and a ring gear, said second transmission unit further including first and second brakes, and first, second, third and fourth clutches,
wherein said second transmission unit constitutes first, second, third and fourth rotary modules, each of which is provided by at least one of the sun gears, carriers and ring gears of said two planetary gear sets,
wherein said first rotary module is selectively connected to said second intermediate transmitting path through said second clutch, while being selectively connected to said stationary member through said first brake,
wherein said second rotary module is selectively connected to said first intermediate transmitting path through said third clutch, while being selectively connected to said stationary member through said second brake,
wherein said third rotary module is connected to said output rotary member,
wherein said fourth rotary module is selectively connected to said first intermediate transmitting path through said fourth clutch, while being selectively connected to said second intermediate transmitting path through said first clutch,
and wherein said plurality of drive positions are established by selectively engaging and releasing said brakes and said clutches.

11 more elements

A planetary-gear-type multiple-step transmission for a vehicle, having a plurality of drive positions which are selectively established, said transmission comprising:

a stationary member;
an input rotary member;
an output rotary member;
a first transmission unit which is connected to said input rotary member;
and
a second transmission unit which is connected to said output rotary member,
wherein said first transmission unit has first and second intermediate transmitting paths through which a rotary motion of said input rotary member is transmittable to said second transmission unit such that a speed of the rotary motion transmitted through said second intermediate transmitting path is lower than a speed of the rotary motion transmitted through said first intermediate transmitting path,
wherein said second transmission unit includes two planetary gear sets, first and second brakes, and first, second, third and fourth clutches,
wherein a second planetary gear set as one of said two planetary gear sets is a double-pinion type planetary gear set, and includes a second sun gear, a second carrier, a second ring gear and at least one pair of pinion gears which are rotatably held by said second carrier and which mesh with each other,
wherein a third planetary gear set as the other of said two planetary gear sets is a single-pinion type planetary gear set, and includes a third sun gear, a third carrier and a third ring gear,
wherein said second sun gear and said third sun gear are selectively connected to said second intermediate transmitting path through said second clutch, while being selectively connected to said stationary member through said first brake,
wherein said second ring gear and said third carrier are selectively connected to said first intermediate transmitting path through said third clutch, while being selectively connected to said stationary member through said second brake,
wherein said third ring gear is connected to said output rotary member,
wherein said second carrier is selectively connected to said first intermediate transmitting path through said fourth clutch, while being selectively connected to said second intermediate transmitting path through said first clutch,
and wherein said plurality of drive positions are established by selectively engaging and releasing said brakes and said clutches.

12 more elements

A planetary-gear-type multiple-step transmission for a vehicle, having a plurality of drive positions which are selectively established, said transmission comprising:

a stationary member;
an input rotary member;
an output rotary member;
a first transmission unit which is connected to said input rotary member;
and
a second transmission unit which is connected to said output rotary member,
wherein said first transmission unit has first and second intermediate transmitting paths through which a rotary motion of said input rotary member is transmittable to said second transmission unit such that a speed of the rotary motion transmitted through said second intermediate transmitting path is lower than a speed of the rotary motion transmitted through said first intermediate transmitting path,
wherein said second transmission unit includes two planetary gear sets, first and second brakes, and first, second, third and fourth clutches,
wherein a second planetary gear set as one of said two planetary gear sets is a double-pinion type planetary gear set, and includes a second sun gear, a second carrier, a second ring gear and at least one pair of pinion gears which are rotatably held by said second carrier and which mesh with each other,
wherein a third planetary gear set as the other of said two planetary gear sets is a single-pinion type planetary gear set, and includes a third sun gear, a third carrier and a third ring gear,
wherein said second carrier and said third sun gear are selectively connected to said second intermediate transmitting path through said second clutch, while being selectively connected to said stationary member through said first brake,
wherein said second ring gear and said third carrier are selectively connected to said first intermediate transmitting path through said third clutch, while being selectively connected to said stationary member through said second brake,
wherein said third ring gear is connected to said output rotary member,
wherein said second sun gear is selectively connected to said first intermediate transmitting path through said fourth clutch, while being selectively connected to said second intermediate transmitting path through said first clutch,
and wherein said plurality of drive positions are established by selectively engaging and releasing said brakes and said clutches.

12 more elements

A planetary-gear-type multiple-step transmission for a vehicle, having a plurality of drive positions which are selectively established, said transmission comprising:

a stationary member;
an input rotary member;
an output rotary member;
a first transmission unit which is connected to said input rotary member;
and
a second transmission unit which is connected to said output rotary member,
wherein said first transmission unit has first and second intermediate transmitting paths through which a rotary motion of said input rotary member is transmittable to said second transmission unit such that a speed of the rotary motion transmitted through said second intermediate transmitting path is lower than a speed of the rotary motion transmitted through said first intermediate transmitting path,
wherein said second transmission unit includes two planetary gear sets, first and second brakes, and first, second, third and fourth clutches,
wherein a second planetary gear set as one of said two planetary gear sets is a double-pinion type planetary gear set, and includes a second sun gear, a second carrier, a second ring gear and at least one pair of pinion gears which are rotatably held by said second carrier and which mesh with each other,
wherein a third planetary gear set as the other of said two planetary gear sets is a single-pinion type planetary gear set, and includes a third sun gear, a third carrier and a third ring gear,
wherein said second sun gear and said third sun gear are selectively connected to said second intermediate transmitting path through said second clutch, while being selectively connected to said stationary member through said first brake,
wherein said second ring gear is selectively connected to said first intermediate transmitting path through said third clutch, while being selectively connected to said stationary member through said second brake,
wherein said third carrier is connected to said output rotary member,
wherein said second carrier and said third ring gear are selectively connected to said first intermediate transmitting path through said fourth clutch, while being selectively connected to said second intermediate transmitting path through said first clutch,
and wherein said plurality of drive positions are established by selectively engaging and releasing said brakes and said clutches.

12 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/964,996Filed 15 Oct 2004
Priority: JP 2003-36569127 Oct 2003
Published: 28 Apr 2005
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

F16H 3/666
Composed of a number of gear trains without drive passing from one train to another: with intermeshing orbital gears
F16H 2200/006
Characterised by the number of forward speeds: the gear ratios comprising eight forward speeds
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

Family

US 7,172,527 B2Related patent
US 2005/0090362 A1This patent

From the US filing history. Foreign family members aren’t listed.

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