Automatic transmission for a vehicle
First Claim
1. An automatic transmission for a vehicle, comprising:
- a case including a sidewall;
an input shaft;
a speed reduction planetary gear set that comprises a stationary element which is held against rotation, an input rotary element that receives input rotation from the input shaft;
a reduced speed rotary element that outputs a reduced speed rotation at a speed less than that of the input rotation;
a planetary gear unit that includes first, second, third, and fourth rotary elements that are arranged in a rotational speed relationship according to their gear relationships;
a first input transfer clutch, having output side and input side transfer members, for selective transfer of the input rotation to the first rotary element;
a second input transfer clutch, having output side and input side transfer members, for selective transfer of the input rotation to the third rotary element;
a first speed reduction transfer clutch, having output side and input side transfer members, for selective transfer of reduced speed rotation through the speed reduction planetary gear set to the first rotary element;
a second speed reduction transfer clutch, having output side and input side transfer members, for selective transfer of reduced speed rotation through the speed reduction planetary gear set to the second rotary element;
a first brake for selectively locking the first rotary element against rotation; and
a second brake for selectively locking the third rotary element against rotation; and
wherein the automatic transmission outputs rotation from the fourth rotary element;
wherein the output side transfer member of the second input transfer clutch extends coaxially with and radially outward of the output side transfer members of the first and second speed reduction transfer clutches to link with the third rotary element;
wherein the output side transfer member of the first input transfer clutch and the output side transfer member of the first speed reduction transfer clutch are linked to the first rotary element, thereby rotate integrally, and are coaxial with and radially inward of the output side transfer member of the second speed reduction transfer clutch; and
wherein;
a first forward speed is established by engaging the second speed reduction transfer clutch and locking the second brake;
a second forward speed is established by engaging the second speed reduction transfer clutch and locking the first brake;
a third forward speed is established by engaging the second speed reduction transfer clutch and the first speed reduction transfer clutch;
a fourth forward speed is established by engaging the second speed reduction transfer clutch and the first input transfer clutch;
a fifth forward speed is established by engaging the second speed reduction transfer clutch and the second input transfer clutch;
a sixth forward speed is established by engaging the second input transfer clutch and the first input transfer clutch;
a seventh forward speed is established by engaging the second input transfer clutch and the first speed reduction transfer clutch;
an eighth forward speed is established by engaging the second input transfer clutch and locking the first brake; and
a reverse speed is established by engaging the first speed reduction transfer clutch or the first input transfer clutch, and locking the second brake.
1 Assignment
0 Petitions
Accused Products
Abstract
An output side transfer member 103 of a second clutch C-2 extends around the outer circumferences of the output side transfer members 101, 102 of the third and first clutches C-3, C-1, the output side transfer member 104 (or 13, 101) of a fourth clutch C-4 and the output side transfer member 101 of a third clutch C-3 are linked to a sun gear S2, the output side transfer member 104 (or 13, 101) of a fourth clutch C-4, an output side transfer member 101 of a third clutch C-3, and a sun gear S2, which rotate integrally, are disposed radially inward with respect to the output side transfer member 102 of the first clutch C-1. Thereby, it becomes possible to reduce the diameter of the output side transfer member 104 (or 13, 101) of the fourth clutch C-4, to reduce the weight and inertia, and to improve the controllability of the automatic transmission 1.
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Citations
10 Claims
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1. An automatic transmission for a vehicle, comprising:
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a case including a sidewall; an input shaft; a speed reduction planetary gear set that comprises a stationary element which is held against rotation, an input rotary element that receives input rotation from the input shaft; a reduced speed rotary element that outputs a reduced speed rotation at a speed less than that of the input rotation; a planetary gear unit that includes first, second, third, and fourth rotary elements that are arranged in a rotational speed relationship according to their gear relationships; a first input transfer clutch, having output side and input side transfer members, for selective transfer of the input rotation to the first rotary element; a second input transfer clutch, having output side and input side transfer members, for selective transfer of the input rotation to the third rotary element; a first speed reduction transfer clutch, having output side and input side transfer members, for selective transfer of reduced speed rotation through the speed reduction planetary gear set to the first rotary element; a second speed reduction transfer clutch, having output side and input side transfer members, for selective transfer of reduced speed rotation through the speed reduction planetary gear set to the second rotary element; a first brake for selectively locking the first rotary element against rotation; and a second brake for selectively locking the third rotary element against rotation; and wherein the automatic transmission outputs rotation from the fourth rotary element; wherein the output side transfer member of the second input transfer clutch extends coaxially with and radially outward of the output side transfer members of the first and second speed reduction transfer clutches to link with the third rotary element; wherein the output side transfer member of the first input transfer clutch and the output side transfer member of the first speed reduction transfer clutch are linked to the first rotary element, thereby rotate integrally, and are coaxial with and radially inward of the output side transfer member of the second speed reduction transfer clutch; and
wherein;a first forward speed is established by engaging the second speed reduction transfer clutch and locking the second brake; a second forward speed is established by engaging the second speed reduction transfer clutch and locking the first brake; a third forward speed is established by engaging the second speed reduction transfer clutch and the first speed reduction transfer clutch; a fourth forward speed is established by engaging the second speed reduction transfer clutch and the first input transfer clutch; a fifth forward speed is established by engaging the second speed reduction transfer clutch and the second input transfer clutch; a sixth forward speed is established by engaging the second input transfer clutch and the first input transfer clutch; a seventh forward speed is established by engaging the second input transfer clutch and the first speed reduction transfer clutch; an eighth forward speed is established by engaging the second input transfer clutch and locking the first brake; and a reverse speed is established by engaging the first speed reduction transfer clutch or the first input transfer clutch, and locking the second brake. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification