Power transmission device for a motor vehicle and method for using said device
First Claim
1. Power transmission device between a heat engine and wheels of a motor vehicle, this device havinga first and a second electrical machine, anda mechanical group connecting with each other a shaft of the engine, a shaft of the wheels, and shafts of the electrical machines, this mechanical group havingat least two epicycloidal gear trains, each epicycloidal gear train having several elements mutually engaged with gear shafts, andat least one switching device ensuring, by displacement, a selective connection of one of the shafts with a first element or a second element of the mechanical group to which this shaft is capable of being connected,whereinthe switching device has means for simultaneously ensuring a connection between the selectively connected shaft and the two elements of the mechanical group, during a displacement of this switching device.
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Accused Products
Abstract
The invention mainly relates to a power transmission device (1) between an internal combustion engine (2) and vehicle wheels (3) consisting of a pair of electrical machines (4.1, 4.2) and a mechanical assembly (90), wherein said assembly (90) comprises at least two epicycloidal trains (5, 9) each of which is provided with three mutually engageable elements. According to said invention, a switching device (23.1) comprises means (23, 28) for simultaneously connecting the machine shaft (11) to two other elements (11.1, 11.2) of the mechanical assembly (90) during switching between two operating modes of the transmission device (1).
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Citations
16 Claims
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1. Power transmission device between a heat engine and wheels of a motor vehicle, this device having
a first and a second electrical machine, and a mechanical group connecting with each other a shaft of the engine, a shaft of the wheels, and shafts of the electrical machines, this mechanical group having at least two epicycloidal gear trains, each epicycloidal gear train having several elements mutually engaged with gear shafts, and at least one switching device ensuring, by displacement, a selective connection of one of the shafts with a first element or a second element of the mechanical group to which this shaft is capable of being connected, wherein the switching device has means for simultaneously ensuring a connection between the selectively connected shaft and the two elements of the mechanical group, during a displacement of this switching device.
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12. Method of using a power transmission device between a heat engine and wheels of a motor vehicle, this power transmission device having a first and a second electrical machine, a switching device, and a mechanical group connecting with each other a shaft of the engine, a shaft of the wheels, and shafts of the electrical machines, this mechanical group having at least two epicycloidal gear trains, each gear train having several elements mutually meshing with gear shafts, having,
in a first operating mode, connecting a shaft of a machine to an element of the mechanical group with the help of a sliding sleeve of the switching device, and in a second operating mode, connecting the shaft of this same machine to another element of the mechanical group with the help of the sliding sleeve, said method including if the machine does not operate as a motor during the passage from one mode to another, applying a torque to the shaft of the other machine to compensate the presence of a parasitic torque on this shaft.
Specification