Wheel motor assembly

Abstract

Assembly for wheel motor Assembly (1) comprising a reduction gear (10) for wheel motor and a motor (20), the reduction gear (10) comprising a reduction gear housing (12) defining an internal enclosure (I), an output hub (16) supported relative to the reduction gear housing (12) by a bearing (18), an input member (32A) and a reduction stage (30A, 30B) arranged in the internal enclosure (I) and coupling the input member (32A) and the output hub (16) modifying the torque and speed ratio between the latter, the input member (32A) and the output hub (16) being rotatable about an axial direction (X), the motor (20) comprises a motor housing (22) and a motor shaft (24) coupled to the input member (32A), the motor housing (22) being fixed to the reduction gear housing (12) such that at one axial end (12a) of the reducer (10), the internal enclosure (I) is closed by the motor (20). Figure for the abstract: Fig. 1.

Claims

Claims

1. Assembly (1) comprising an electric motor (20) for a wheel motor and a brake (40), wherein: - the electric motor (20) comprises a motor housing (22), a rotor (R) and a stator (S) housed in the motor housing (22), - the stator (S) is fixedly mounted in the motor housing (22) and comprises a first polar element (26), - the rotor (R) comprises a second polar element (27) carried by a motor shaft (24) rotatable about a central axis of rotation defining an axial direction (X), the rotor (R) being mounted movably relative to the stator (S) so that the second polar element (27) is surrounded by the first polar element (26), wherein the first polar element (26) extends beyond the second polar element (27) in the axial direction so as to define a recess (21) between the motor shaft (24) and the first polar element (26), the brake (40) being at least partially positioned in said recess (21).

2. An assembly (1) according to claim 1, wherein the motor housing (22) comprises a closure plate (222) having an internal recess (223) defining a housing (224) open to the outside of the motor housing (22) and extending at least partially into the recess (21), the brake (40) being at least partially positioned in said housing (224), the internal recess (223) forming a brake housing.

3. Assembly (1) according to claim 2, in which the brake (40) comprises: - first braking elements (42), integral in rotation with the motor shaft (24), - second braking elements (44) fixed in rotation relative to the brake housing (223), adapted to cooperate with the first braking elements (42), the first and second braking elements (42, 44) forming an axial stack, - an elastic return element (45) configured so as to exert a clamping force on the first and second braking elements (42, 44) in a clamping direction, - a brake release actuator (46), adapted to urge the elastic return element (45) in a direction opposite to the clamping direction, - a brake cover (48) assembled on the motor housing (22), so that the brake (40) is at least partially positioned in said housing (224).

4. An assembly (1) according to claim 3, wherein the second braking elements (44) comprise external anti-rotation splines cooperating with locking teeth (225) formed on the brake housing (223), so as to prevent rotational movement of the second braking elements (44) relative to the brake housing (223) around the central axis (X).

5. Assembly (1) according to claim 3 or 4, wherein the brake (40) is an electromagnetic brake, and wherein: - the first braking elements (42) comprise at least one brake disc comprising internal splines (422) adapted to cooperate with teeth of the motor shaft (24) so as to be driven in rotation by said motor shaft (24), - the second braking elements (44) comprise a piston disc (441) movable in translation along the central axis (X), and at least one counter disc (442), the brake disc (42) being arranged axially between the piston disc (441) and the counter disc (442), the elastic return element (45) being a spring arranged in the brake cover (48) and configured, in a braking situation, so as to push the piston disc (441) towards the brake disc (42) and thus to exert a clamping force on the brake disc (42) between the piston disc (441) and the counter disc (442),- the brake release actuator (46) comprising a third polar element configured to, in a free rotation situation, attract the piston disc (441) so as to compress the spring (45) and thus release the clamping force exerted on the brake disc (42).,

6. An assembly (1) according to claim 5, wherein the third polar element is a coil disposed in an annular housing (482) formed in the brake cover (48).

7. An assembly (1) according to any one of claims 3 to 6, wherein an outer diameter (483) of the brake cover (48) is greater than the diameter of the first and second braking elements (42, 44).

8. An assembly (1) according to any one of claims 3 to 7, wherein an inner diameter (484) of the brake cover (48) comprises a seal (49) capable of establishing a sealed connection between the brake cover (48) and the motor shaft (24).

9. Assembly (1) according to any one of claims 1 to 8, further comprising a reduction gear (10) for a wheel motor fixed to the electric motor (20), the brake (40) being arranged axially between the second polar element (27) and the reduction gear (10).

10. Assembly (1) according to claim 9, comprising an electric variator (50) fixed on the electric motor (20) on a side opposite the reducer (10), the electric variator (50) comprising at least one electric card, and comprising a control part capable of controlling the electric motor (20) and the brake (40).

11. Assembly (1) according to claims 3 and 10, wherein the motor housing (22) comprises a clearance (226) adapted to receive an electric cable connecting the control part and the brake (40), in particular connecting the control part and the brake release actuator (46).

12. Assembly (1) according to claims 3 and 10, in which the stator (S) comprises a pack of sheets through which is formed a notch or a bore capable of receiving an electric cable connecting the control part and the brake (40), in particular connecting the control part and the brake release actuator (46).

13. A vehicle (90) comprising a body (92) and wheels (94), and at least one assembly (1) according to any preceding claim, the at least one assembly (1) comprising an output hub (16) carrying one of the wheels (94) and said assembly (1) supporting the body (92) of the vehicle relative to said wheel (94).

14. Vehicle (90) according to claim 13, comprising a plurality of assemblies (1), each assembly (1) being connected to a control bus (81) capable of exchanging information and commands with each assembly (1), to a cooling bus (82) capable of supplying each assembly (1) with cooling fluid, and to a power bus (83) capable of supplying direct current to each assembly (1).

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