Transmission arrangements for hybrid electric vehicles
First Claim
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1. A powertrain for a hybrid electric vehicle having an engine, an electric generator and an electric motor acting as a pair of drive power sources for driving vehicle traction wheels, the powertrain comprising:
- gear elements drivably connecting the pair of power sources to the traction wheels through first and second geared power flow paths, gear elements defining at least one geared power flow path having at least two gear ratios;
one of the pair of drive power sources being connected by the gear elements to the traction wheels through the first geared power flow path independently of the second geared power flow; and
a clutch in the one geared power flow path connecting together two gear elements of the one geared power flow path to establish a first of the two gear ratios when it is engaged, a second gear ratio in the one geared power flow path being established when the clutch is disengaged.
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Abstract
A geared, power transmission mechanism for a hybrid electric vehicle wherein multiple power flow paths are established between an engine and vehicle traction wheels and between an electric motor and the vehicle traction wheels. At least one of the power flow paths is characterized by at least two ratios.
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Citations
20 Claims
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1. A powertrain for a hybrid electric vehicle having an engine, an electric generator and an electric motor acting as a pair of drive power sources for driving vehicle traction wheels, the powertrain comprising:
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gear elements drivably connecting the pair of power sources to the traction wheels through first and second geared power flow paths, gear elements defining at least one geared power flow path having at least two gear ratios; one of the pair of drive power sources being connected by the gear elements to the traction wheels through the first geared power flow path independently of the second geared power flow; and a clutch in the one geared power flow path connecting together two gear elements of the one geared power flow path to establish a first of the two gear ratios when it is engaged, a second gear ratio in the one geared power flow path being established when the clutch is disengaged. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A powertrain for a hybrid electric vehicle having an engine, an electric generator and an electric motor defining a pair of power sources, the powertrain comprising:
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a planetary gear unit with a first planetary element connected drivably to the generator and a second planetary element connected drivably to the engine whereby a first power flow path to vehicle traction wheels is established; a geared connection between the motor and the vehicle traction wheels, the geared connection defining a second power flow path that is independent of the first power flow path while sharing with the first power flow path at least one gear element; and a clutch friction element sub-assembly for establishing, when it is selectively engaged and disengaged, each of two gear ratios in the planetary gear unit. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification