Back to results
US 7,608,008 B2Granted
Eight-speed powertrain of automatic transmission for vehicle
AssigneeHyundai Motor Company
InventorKang Soo Seo
Life of this patent
Estimating the term…
Abstract
A eight-speed powertrain of an automatic transmission for a vehicle combining four simple planetary gear set with a plurality of clutches and brakes to realize seventh forward speed or eighth forward speed and two reverse speeds can improve power delivery performance and reduce fuel consumption.
Claims5
An eight-speed powertrain of an automatic transmission for a vehicle comprising:
- a first shift portion comprising first and second planetary gear sets, an input path to which power directly is input from an input shaft, and an intermediate output path outputting the power by decelerating;
- and
- a second shift portion comprising third and fourth planetary gear set, a first intermediate input path receiving the power through the intermediate output path of the first shift portion, a second intermediate input path which the power is variably input from the input shaft, and a final output path configured to shift and output the power input through the first and the second intermediate input path;
- wherein:
- the first planetary gear set comprises a single pinion planetary gear set comprising a first sun gear, a first ring gear, and a first planet carrier;
- the second planetary gear set comprises a single pinion planetary gear set comprising a second sun gear, a second ring gear, and a second planet carrier;
- the third planetary gear set comprises a single pinion planetary gear set comprising a third sun gear, a third ring gear, and a third planet carrier;
- and
- the fourth planetary gear set comprises a single pinion planetary gear set comprising a fourth sun gear, a fourth ring gear, and a fourth planet carrier;
- and wherein:
- the third ring gear and the fourth planet carrier are directly connected;
- the third ring gear is selectively connected to the input shaft through a first clutch,
- the first sun gear is selectively connected to the first planetary carrier through a second clutch,
- the fourth sun gear is selectively connected to the third sun gear through a third clutch,
- the first planetary carrier is selectively connected to a transmission housing through a first brake
- the third sun gear is selectively connected to the transmission housing through a second brake,
- the first sun gear is selectively connected to the transmission housing through a third brake, and
- the fourth planetary carrier is selectively connected to the transmission housing through a fourth brake.
15 more elements
A power train of an automatic transmission, comprising
- a first planetary gear set having operating members of a first sun gear, a first ring gear, and a first planetary carrier;
- a second planetary gear set having operating members of a second sun gear, a second ring gear, and a second planetary carrier;
- a third planetary gear set having operating members of a third sun gear, a third ring gear, and a third planetary carrier;
- and
- a fourth planetary gear set having operating members of a fourth sun gear, a fourth ring gear, and a fourth planetary carrier,
- wherein:
- the second ring gear is directly connected to an input shaft;
- the third planetary carrier is directly connected to an output shaft;
- the first ring gear, the second planetary carrier, and the fourth ring gear are directly connected to each other;
- the first sun gear and the second sun gear are directly connected to each other,
- the third ring gear and the fourth planetary carrier are directly connected to each other,
- the third ring gear is selectively connected to the input shaft through a first clutch,
- the first sun gear is selectively connected to the first planetary carrier through a second clutch,
- the fourth sun gear is selectively connected to the third sun gear through a third clutch,
- the first planetary carrier is selectively connected to a transmission housing through a first brake,
- the third sun gear is selectively connected to the transmission housing through a second brake,
- the first sun gear is selectively connected to the transmission housing through a third brake, and
- the fourth planetary carrier is selectively connected to the transmission housing through a fourth brake.
15 more elements
Dependencies are inferred from the claim text.