Motor vehicle drive device

Abstract

Motor vehicle drive device for connecting an internal combustion engine (1) to an electromechanical energy converter (2), wherein said energy converter is set up for starting the internal combustion engine, and to a starter generator transmission (5) with a first drive train (3) which is set up for conducting a torque from the electromechanical energy converter (2) to the internal combustion engine (1) during the starting of the internal combustion engine, and wherein said transmission (5) has a step-down transmission ratio in the direction from the electromechanical energy converter (2) to the internal combustion engine (1), and, furthermore, said transmission (5) has a second drive train (4) which is set up for at least temporarily conducting a torque in the direction from the internal combustion engine (1) to the electromechanical energy converter (2), and wherein the second drive train (4) is arranged parallel to the first drive train, in relation to the transmission of torque between the electromechanical energy converter (2) and the internal combustion engine (1), characterized in that the first drive train (3) has a one-way clutch which is set up in such a way that, during the starting of the internal combustion engine (1), a torque can be transmitted to the latter from the electromechanical energy converter (2) via said drive train (3), and that the second drive train (4) has a speed-sensitive clutch (6) which is open until a first speed threshold is reached, with the result that, in said state, no torque can be transmitted by way of the second drive train (4) fromthe internal combustion engine (1) to the electromechanical energy converter (2), and that the speed-sensitive clutch (6) is closed from said first speed threshold being exceeded.

Description

technical field [0001] The invention relates to a motor vehicle drive having an internal combustion engine and having an electromechanical energy converter. A motor vehicle drive according to the preamble of claim 1 is known from DE 199 41 705 A1. Background technique [0002] The invention is then described in terms of a motor vehicle drive train for a passenger car, which should not be understood as limiting the invention to such an application. In motor vehicles, a combination of an internal combustion engine and an electromechanical energy converter is frequently used in the form of a so-called hybrid drive. The functional design (starting, driving, recuperation, etc.) The generator is easily conceivable for starting the internal combustion engine and for driving the motor vehicle. A disadvantage of such an arrangement, however, is that such a large electromechanical energy converter has a large installation space requirement, which is generally disadvantageous because...

AI Technical Summary

Problems solved by technology

A disadvantage of such an arrangement, however, is that such a large electromechanical energy converter has a large installation space requirement, which is generally disadvantageous because the available installation space is designed in a tight manner.

"Small" electromechanical energy converters, that is to say energy converters that do not permanently deliver a power of more than 35 kW, can be considered for starting the internal combustion engine with the corresponding transmission ratio, but due to this transmission ratio and due to the rotational speed limit when driving motor vehicles are restricted

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