Hyundai Motor Company

Horim Yang

JongSool Park

Changwook Lee

Donghwan Hwang

Wonmin Cho

Kangsoo Seo

Jaechang Kook

A power transmission system of a hybrid electric vehicle may include an input shaft, an output shaft, a first planetary gear set having three rotation elements, a second planetary gear set having three rotation elements, a third planetary gear set, a first rotational shaft, a second rotational shaft, a third rotational shaft, a fourth rotational shaft, a fifth rotational shaft, a sixth rotational shaft, and a seventh rotational shaft such that the power transmission system can suppress conversion to an ENG mode by providing sufficient power performance at the time of wide open throttle (WOT) launching and maximally use power of an engine at the time of conversion to a first HEV mode and a third HEV mode.

Power transmission system of hybrid electric vehicle

A power transmission system of a hybrid electric vehicle may include an input shaft to which power from an engine is input, an output shaft, a planetary gear set including a first rotation element being driven by electrical driving force, a second rotation element being externally engaged with the output shaft as an output element, and a third rotation element being driven by rotational power of an engine, a first motor/generator directly connected to the first rotation element of the planetary gear set, a second motor/generator selectively externally engaged with the output shaft, a first transfer gear, a second transfer gear, a variable connecting unit selectively connecting the first transfer gear to the input shaft or the output shaft, and a variable direct coupling unit selectively connecting two rotation elements among the three rotation elements, of the planetary gear set.

A power transmission system of a hybrid electric vehicle may include an input shaft, an output shaft, a first planetary gear set having three rotation elements, a second planetary gear set having three rotation elements, a third planetary gear set, a first shaft, a second shaft, a third shaft, a fourth shaft, a fifth shaft, a sixth shaft, and a seventh rotational shaft such that the power transmission system can suppress conversion to an Engine (ENG) mode by providing sufficient power performance at the time of wide open throttle (WOT) launching and maximally use power of an engine at the time of conversion to a first Hybrid-Electric Vehicle (HEV) mode and a third HEV mode.

A power transmission system of a hybrid electric vehicle may includes an input shaft, a first planetary gear set disposed on the input shaft while including three rotation elements having a first sun gear, a first planetary carrier, and a first ring gear; a second planetary gear set having a second sun gear, a second planetary carrier, and a second ring gear; a third planetary gear set having a third sun gear, a third planetary carrier, and a third ring gear; first to seventh rotation shafts, and three friction elements configured to selectively connect the respective rotation shafts to each other or selectively connect the respective rotation shafts to the transmission housing.

A power transmission system of a hybrid electric vehicle includes an input shaft a first planetary gear set disposed on the input shaft while having a first sun gear, a first planetary carrier, and a first ring gear, a second planetary gear set having a second sun gear, a second planetary carrier, and a second ring gear, a third planetary gear set having a third sun gear, a third planetary carrier, and a third ring gear, first to sixth rotation shafts and three friction elements selectively connect the respective rotation shafts to each other or selectively connect the respective rotation shafts to the transmission housing.

A power transmission system of a hybrid electric vehicle may include an input shaft, an output gear disposed on the input shaft, a first planetary gear set having a first sun gear, a first planetary carrier, and a first ring gear; a second planetary gear set having a second sun gear, a second planetary carrier, and a second ring gear; a third planetary gear set having a third sun gear, a third planetary carrier, and a third ring gear; first to seventh rotation shafts, and three friction elements configured to selectively connect the respective rotation shafts to each other or selectively connect the respective rotation shafts to the transmission housing.

A power transmission system of a hybrid electric vehicle includes: an input shaft; an output shaft; first, second and third planetary gear sets; a first rotational shaft, a second rotational shaft, a third rotational shaft, a fourth rotational shaft; a fifth rotational shaft; a sixth rotational shaft; and three friction elements mutually selectively connecting rotational shafts to each other or selectively connecting the respective rotational shafts and the transmission housing such that the power transmission system of the hybrid electric vehicle can suppress conversion to an ENG mode by providing sufficient power performance at a time of wide open throttle (WOT) launching and maximally use power of an engine at a time of conversion to a first HEV mode and a third HEV mode.

The present invention can achieve hybrid modes with an input split mode, output split mode, and complex split mode, by using only one set of stepped pinion planetary gear sets, one set of single pinion planetary gear sets, three clutches, and two brakes, ensure the space of a vehicle with a compact configuration and reduce the cost by implementing five stages of fixed gear ratio mode, and achieve continuous transmission gear ratios, and improve the fuel efficiency of the vehicle by changing the modes in accordance with the traveling conditions of the vehicle. Further, since it is possible to reduce the performance required for a motor generator under the same conditions, by improving the performance of the system, it is possible to reduce the cost of the vehicle. Accordingly, the present invention provides a power train for a hybrid vehicle that can contribute to reduce the cost of a vehicle.

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Yongin-si, South Korea

Horim Yang