Electric propulsion system for mobility devices

Abstract

The present invention relates to a propulsion system (1) for a mobility device comprising at least one motor (2), an electronic assembly (3), and a reduction gear (4), and not including a belt. Abstract figure: Figure 1

Description

Title of the invention: Electric propulsion system for a mobility device

[0001] The present invention relates to the field of mobility devices, in particular motor vehicles, and more specifically aims at an electric propulsion system enabling the transmission of power to drive the wheels of such devices.

[0002] The electric propulsion system enabling the transmission of power in a motor vehicle aims to drive at least one wheel of the vehicle in rotation, by transmitting the torque supplied by a drive shaft, in particular electric or hybrid.

[0003] A belt-driven power propulsion system is already known from document WO2021224148. The belt in the system is configured to drive at least one wheel. In other words, the belt is positioned in the torque transmission path between the engine and at least one wheel of the vehicle. The belt is thus configured to transmit engine torque to at least one drive wheel of the vehicle, specifically to two drive wheels of the vehicle. The presence of such a belt necessitates precise and complex adjustments. Furthermore, such a system uses an external cooling system, which complicates the integration of the transmission system.

[0004] The present invention therefore aims to overcome one or more of the drawbacks of prior art systems by proposing an improved electric propulsion system.

[0005] For this purpose, the present invention proposes a propulsion system for a mobility device comprising at least one motor, an electronic assembly, and a reducer, and not including a belt to transmit torque.

[0006] The absence of a belt simplifies the propulsion system and limits operational problems related to belt deterioration.

[0007] According to one embodiment of the invention, the propulsion system for the mobility device comprises at least one motor and an electronic assembly.

[0008] According to one embodiment of the invention, the motor is an electric motor.

[0009] According to one embodiment of the invention, the propulsion system comprises a self-contained cooling system.

[0010] Such a propulsion system can thus be integrated directly into a mobility device without any special adaptation.

[0011] According to one embodiment of the invention, the electronic assembly includes the elements necessary for the operation of the electric motor.

[0012] According to one embodiment of the invention, the electronic assembly is an inverter.

[0013] According to one embodiment of the invention, the inverter, the electric motor and the reducer are arranged one after the other along a longitudinal axis A.

[0014] According to one embodiment of the invention, the cooling system is formed by a conduit running through all the elements of the propulsion system to cool them.

[0015] According to one embodiment of the invention, the cooling system comprises a first conduit leading from the electronic system and running along the motor towards the reducer, a second cooling conduit running along the reducer arriving in a housing comprising a heat sink associated with a pump and disposed at the level of the reducer, a third conduit leading from the housing and arriving in the electronic system.

[0016] The invention also relates to the use of the propulsion system according to the invention in a mobility device.

[0017] According to one embodiment of the invention, the mobility device comprises two or three wheels.

[0018] Other objects, features and advantages of the invention will be better understood and will become more apparent upon reading the description given below, with reference to the accompanying figures, given by way of example and in which:

[0019] [Fig-1]: [Fig.1] is a schematic representation of the demotorization system according to the invention, according to an embodiment of the invention,

[0020] [Fig.2]: [Fig.2] represents the circulation of the cooling fluid of the propulsion system according to the invention.

[0021] The invention, illustrated [Fig. 1], relates to a propulsion system 1 for a mobility device. The present invention is particularly intended for use in a motor vehicle, but also for use in any light, medium, or heavy land vehicle intended for the transport of passengers or goods, as well as construction or agricultural machinery. Within the scope of the invention, a propulsion system is a system that enables propulsion and includes the elements for transmitting power from the engine to the wheels.

[0022] The propulsion system includes at least one motor 2, an electronic assembly 3, and a reducer 4, without a belt to transmit the torque.

[0023] According to one embodiment of the invention, the motor 2 is an electric motor.

[0024] The electronic assembly 3 includes the elements necessary for the operation of the electric motor 2.

[0025] According to one embodiment of the invention, the electronic assembly 3 is an inverter 3.

[0026] According to one embodiment of the invention, the inverter 3, the electric motor 2 and the reducer 4 are arranged one after the other along a longitudinal axis A. The longitudinal axis A is the longitudinal axis of the motor 2.

[0027] According to one embodiment of the invention, the inverter 3 is fixed to the motor 2 which is itself fixed to the reducer 4. The motor 2 is thus arranged between the inverter 3 and the reducer 4.

[0028] The electric motor 2, via the gearbox 4, thus drives at least one rotating wheel. The gearbox allows a reduction ratio to be applied to the motor: it reduces the motor's output speed while increasing the torque to adapt to the operating requirements.

[0029] According to one embodiment of the invention, the coupling, via the output shaft of the reducer, between the propulsion system and the wheels is direct. That is to say, it does not involve a belt.

[0030] According to one embodiment of the invention, the coupling, via the motor shaft, between the motor 2 and the reducer 4 is direct. That is to say, it does not involve a belt.

[0031] The absence of a belt simplifies the propulsion system and limits operational problems related to belt deterioration.

[0032] Within the framework of the invention, the propulsion system includes an autonomous cooling system 5.

[0033] Such a propulsion system can thus be integrated directly into a mobility device without any special adaptation.

[0034] According to one embodiment of the invention, the cooling system 5 is formed of a conduit running through all the elements of the propulsion system 1 to cool them.

[0035] According to one embodiment of the invention, a cooling fluid circulates in the cooling conduit.

[0036] According to one embodiment of the invention, illustrated with the fluid circulation 6 [Fig. 2], a first conduit 51 emerges from the electronic system and runs alongside the motor 2 towards the gearbox 4. This first conduit 51 allows the fluid to circulate through the motor 2 to cool it. This first conduit 51 joins a second cooling conduit 52 running alongside the gearbox 4. These two conduits 51 run alongside the motor 2 and the gearbox 4 along the axis A of the motor 2. This second conduit 52 enters a housing 53, comprising a heat sink 531 associated with a pump 532, located at the gearbox 4. The heat sink and the pump cool the fluid and allow its circulation. A third conduit 54 emerges from the housing 52 and runs along the gearbox and then the motor 2 along axis A. This third conduit 54 enters the electronic system 3. The fluid circulates within the system electronics via conduits or other cooling elements. The fluid then exits the electronic system 3 into the first conduit 51.

[0037] According to one embodiment of the invention, the fluid circulation can be reversed. In this case, the first conduit 51 plays the role of the last conduit.

[0038] Such a propulsion system 1 can be used in a mobility device with 2, 3, 4 or more wheels. And for example, a motor vehicle or a motorcycle.

[0039] The scope of the present invention is not limited to the details given above and allows for embodiments in many other specific forms without departing from the field of application of the invention. Therefore, the present embodiments should be considered by way of illustration and may be modified without, however, departing from the scope defined by the claims.

Claims

Demands

1. Propulsion system (1) for a mobility device comprising at least one electric motor (2), an electronic assembly (3), and a reduction gear (4), not having a belt and comprising a self-contained cooling system (5), the cooling system comprising a first conduit (51) exiting from the electronic assembly and running alongside the motor (2) to the reduction gear (4), a second cooling conduit (52) running alongside the reduction gear (4) entering a housing (53) comprising a heat sink (531) associated with a pump (532) and disposed at the reduction gear, a third conduit (54) exiting from the housing (53) and entering the electronic system (3).

2. Propulsion system (1) according to claim 1, wherein the electronic assembly (3) is an inverter (3).

3. Propulsion system (1) according to claim 2, wherein the inverter (3), the motor (2) and the reducer (4) are arranged one after the other along a longitudinal axis A.

4. Propulsion system (1) according to any one of claims 1 to 3, wherein the cooling system (5) is formed of a conduit running through all the elements of the propulsion system (1) to cool them.

5. Use of the propulsion system (1) according to any one of claims 1 to 4 in a mobility device.

6. Mobility device using the propulsion system (1) according to any one of claims 1 to 4, and comprising two or three wheels.

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