Driving unit including a liquid cooled electric motor and a planetary gear
First Claim
1. A driving unit including an electric motor and a planetary gear provided with an input shaft driven by said motor and an output shaft, the driving unit being provided with a cooling circuit for said motor including a positive displacement pump assuring the flow of a liquid in said circuit, said planetary gear including three main elements:
- a sun wheel, a planet wheel carrier provided with several planet wheels, and a ring gear having an inner toothing meshed with said planet wheels, one of said three main elements being connected to said input shaft, another element being connected to said output shaft and the third acting as a reaction element, wherein said pump is driven by the reaction element of the planetary gear.
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Accused Products
Abstract
The invention concerns a driving unit including a liquid cooled electric motor (1) and a planetary gear (3). One of the three main elements of the planetary gear, namely the element used as the reaction element, drives the positive displacement pump of the cooling circuit. Preferably, this element is the ring gear with an inner toothing (23) and said ring gear itself constitutes the pump rotor. The liquid circuit passes into a hollow shaft (11) of the motor rotor and through a radiator (31) incorporated in the common casing (5) containing the motor and the gear. Such a driving unit can be applied to driving a machine or a vehicle.
80 Citations
12 Claims
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1. A driving unit including an electric motor and a planetary gear provided with an input shaft driven by said motor and an output shaft, the driving unit being provided with a cooling circuit for said motor including a positive displacement pump assuring the flow of a liquid in said circuit, said planetary gear including three main elements:
- a sun wheel, a planet wheel carrier provided with several planet wheels, and a ring gear having an inner toothing meshed with said planet wheels, one of said three main elements being connected to said input shaft, another element being connected to said output shaft and the third acting as a reaction element, wherein said pump is driven by the reaction element of the planetary gear.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
Specification