阅读说明：本技术 具有至少一个润滑剂存储槽的旋转电机 (Rotating electrical machine with at least one lubricant reservoir ) 是由 C.莱迪尤 A.蒂拉加纳坦 O.鲁伊斯 于 2019-07-24 设计创作，主要内容包括：本发明主要涉及一种用于机动车辆的组件,所述组件包括：-旋转电机,其包括轴(13),所述轴(13)具有相对于轴承(19)轴向突出的端部,所述轴(13)的端部具有花键(48)；以及-包括互补花键(49)的连接部分(23),所述互补花键用于与所述轴(13)的端部的花键(48)配合,以提供所述轴(13)和所述连接部分(23)之间的机械连接,其特征在于,所述组件包括至少一个凹槽(51),所述凹槽(51)不同于所述轴(13)的端部的花键(48),并且不同于所述连接部分(23)的互补花键(49),以容纳润滑剂储存,从而确保所述轴(13)的端部和所述连接部分(23)之间的润滑。(The present invention generally relates to an assembly for a motor vehicle, said assembly comprising: -a rotating electrical machine comprising a shaft (13), said shaft (13) having an end portion axially protruding with respect to a bearing (19), the end portion of said shaft (13) having splines (48); -a connecting portion (23) comprising complementary splines (49) for cooperating with splines (48) of the end of the shaft (13) to provide a mechanical connection between the shaft (13) and the connecting portion (23), characterized in that the assembly comprises at least one groove (51), the groove (51) being different from the splines (48) of the end of the shaft (13) and from the complementary splines (49) of the connecting portion (23) to accommodate a lubricant reservoir to ensure lubrication between the end of the shaft (13) and the connecting portion (23).)

1. An assembly for a motor vehicle, the assembly comprising:

-a rotating electrical machine (10) comprising:

-a shaft (13);

-a rotor (12) mounted on the shaft (13);

-a stator (11), in particular surrounding the rotor (12);

-a front bracket (15) comprising a container (17) for housing a bearing (19) which ensures the guiding of the rotation of the shaft (13);

-the shaft (13) comprises an end portion extending axially with respect to the bearing (19), the end portion of the shaft (13) having splines (48); and

-a connecting portion (23) comprising complementary splines (49) designed to cooperate with splines (48) of the end of the shaft (13) to ensure a mechanical connection between the shaft (13) and the connecting portion (23),

characterized in that said assembly comprises at least one groove (51), said groove (51) being distinct from the splines (48) of the end of said shaft (13) and from the complementary splines (49) of said connecting portion (23) to accommodate a lubricant reserve to ensure lubrication between the end of said shaft (13) and said connecting portion (23).

2. An assembly according to claim 1, characterized in that the groove (51) is provided at the end of the shaft (13).

3. An assembly according to claim 1 or 2, characterized in that the groove (51) has an orientation different from the orientation of the splines (48) of the end of the shaft (13).

4. Assembly according to any one of claims 1 to 3, characterized in that said groove (51) extends on a plane (P1) orthogonal with respect to the axis of said shaft (13).

5. Assembly according to any one of claims 1 to 3, characterized in that the groove (51) extends on a plane (P2) forming a non-zero angle with respect to a plane (P1) orthogonal to the axis of the shaft (13).

6. Assembly according to any one of claims 1 to 5, characterized in that it comprises a plurality of grooves (51) provided in the shaft (13).

7. Assembly according to any one of claims 1 to 6, characterized in that the depth and/or width of the groove (51) is greater than the depth and/or width of the space between two teeth of the spline (48).

8. Assembly according to any one of claims 1 to 7, characterized in that the recess (51) comprises a through hole.

9. An assembly according to any one of claims 1 to 8, characterised in that the retarder element (22) is a motor vehicle gearbox.

10. An assembly according to any one of claims 1 to 9, characterized in that the retarder element (22) is a retarder mounted on a vehicle drive train and coupled to the rotating electrical machine.

11. A motor vehicle, characterized in that it comprises an assembly according to any one of the preceding claims.

Technical Field

The present invention relates to a rotary electric machine having at least one lubricant storage tank. The invention has particular, but not exclusive, application to high power reversible electric machines coupled to a speed reducer element, operable in alternator mode and in motor mode.

Background

In a known manner, a rotary electric machine comprises a stator and a rotor fixed to a shaft. The stator is mounted in a housing configured to rotate the shaft on the support via bearings.

The rotor comprises a body formed by a stack of metal plates, which are held in groups by means of suitable fixing systems. The rotor comprises poles, for example formed by permanent magnets, which are accommodated in cavities provided in the magnetic masses of the rotor. Alternatively, in a so-called "salient" pole structure, the poles are formed by coils wound on the arms of the rotor.

In addition, the stator comprises a body constituted by a stack of thin metal plates forming a crown, the inner surface of which has a notch open towards the inside, in order to house the windings. The windings are obtained, for example, by continuous wires covered with enamel or by conductive elements in the form of pins connected to each other by welding. The windings comprise phase windings connected in a star or delta shape, the outputs of the phase windings being connected to an electronic control module.

In certain types of motor vehicle traction chains that ensure the transmission of the mechanical power of the heat engine to the wheels of the vehicle, the high-power reversible rotary electric machine can be coupled to a reducer element by means of a connection portion. The retarder element may be in the form of a gearbox of a vehicle or a retarder mounted on a vehicle drive train and connected to a rotating electrical machine.

The rotary electric machine may be operated in alternator mode to supply energy, in particular to the battery and to the on-board network of the vehicle, and in motor mode to ensure the starting of the heat engine and/or to participate in the traction of the vehicle, alone or in combination with the heat engine.

In order to form a mechanical connection between the electric machine and the connection portion connected to the reducer element, the splines for the coupling of the shaft of the electric machine are coated with a lubricant. However, it has been found that after a certain number of operating cycles, the lubricant is drained and spurious noise occurs. In addition, corrosion or premature wear points were observed on the splines of the different parts during disassembly of the assembly.

Disclosure of Invention

The object of the present invention is to effectively eliminate these drawbacks by proposing an assembly for a motor vehicle, said assembly comprising:

-a rotating electrical machine comprising:

-a shaft;

-a rotor mounted on the shaft;

-a stator, in particular surrounding the rotor;

-a front bracket comprising a receptacle for receiving a bearing to ensure guiding of the shaft in rotation;

-the shaft comprises an end portion extending axially relative to the bearing, the end portion of the shaft having splines; and

-a connecting portion comprising complementary splines designed to cooperate with the splines of the end of the shaft to ensure a mechanical connection between the shaft and the connecting portion,

characterised in that the assembly comprises at least one groove distinct from the splines of the end of the shaft and from the complementary splines of the connecting portion to accommodate a lubricant reservoir to ensure lubrication between the end of the shaft and the connecting portion.

Thus, by limiting the steel/steel friction, the present invention makes it possible to extend the service life of the splines of the connecting portion and the shaft. The present invention may also reduce mechanical noise between the splines. In addition, the invention can prevent the corrosion of parts while ensuring easy disassembly even after a certain number of operation cycles.

According to an embodiment, the groove is provided at an end of the shaft.

According to an embodiment, the grooves have an orientation different from the orientation of the splines of the end of the shaft.

According to an embodiment, the groove extends in a plane orthogonal with respect to the axis of the shaft.

According to an embodiment, the groove extends on a plane forming a non-zero angle with respect to a plane orthogonal to the axis of the shaft.

According to an embodiment, the assembly comprises a plurality of grooves provided in the shaft.

According to an embodiment, the depth and/or width of the groove is larger than the depth and/or width of the space between two teeth of the spline.

According to an embodiment, the recess comprises a through hole.

According to one embodiment, the retarder element is a motor vehicle gearbox.

According to one embodiment, said retarder element is a retarder mounted on the vehicle driveline and connected to the rotating electrical machine.

The invention also relates to a motor vehicle characterized in that it comprises an assembly as defined above.

Drawings

The invention will be better understood upon reading the following description and examining the accompanying drawings. These drawings are provided by way of illustration only and do not limit the invention.

Fig. 1 is a perspective view of a rotary electric machine according to the present invention.

Fig. 2 is a longitudinal sectional view of a rotating electric machine according to the present invention.

Fig. 3 is a cross-sectional view of the mechanical connection between the connecting portion of the speed reducer element and the front end portion of the shaft of the rotary electric machine according to the present invention.

Fig. 4a to 4c are perspective views of the front end portion of the shaft of the rotating electric machine according to the present invention, which show different configurations of the lubricant storage groove.

The same, similar or analogous elements have the same reference numerals in the figures.

In the following description, the front-to-back orientation is considered to be a left-to-right orientation in fig. 1 and 2. Thus, a "front" element refers to an element located on one side of front bearing 19, and a "rear" element refers to an element located on the opposite side (i.e., the side of electronic control module 34).

Detailed Description

Fig. 1 and 2 show a rotary electric machine 10, the rotary electric machine 10 comprising a multi-phase stator 11, the multi-phase stator 11 surrounding a rotor 12 mounted on a shaft 13, the shaft 13 having an axis X corresponding to the axis of the machine 10. The stator 11 surrounds the rotor 12, wherein an air gap is present between the inner circumference of the stator 11 and the outer circumference of the rotor 12. The stator 11 is mounted in a housing 14 comprising a front bracket 15 and a rear bracket 16. The front carriage 15 and the rear carriage 16 comprise a container 17, 18, respectively, for housing a respective bearing 19, 20, said bearing 19, 20 ensuring the rotation of the guide shaft 13.

The motor 10 is designed to be coupled to a reducer element 22 via a connecting portion 23 shown in fig. 3. The retarder element 22 may be in the form of a motor vehicle gearbox or a retarder mounted on the vehicle driveline and coupled to the rotating electrical machine 10.

The electric machine 10 can operate in alternator mode to supply energy, in particular, to the battery of the vehicle and to the on-board network, and in motor mode to ensure starting of the heat engine of the vehicle, and can also be used, alone or in combination with the heat engine, to participate in the traction of the vehicle, where appropriate. The power of the motor may for example be comprised between 15kW (kilowatts) and 50kW (kilowatts).

More specifically, the rotor 12 includes a body 24 in the form of a set of metal plates. A permanent magnet 25 is placed in the cavity 26 of the body 24, the magnet 25 being made of rare earth or ferrite depending on the application and the power required by the motor.

In addition, the rotor 12 comprises two flanges 28, 29, each flange 28, 29 being arranged against an axial end face of the rotor 12. These flanges 28, 29 ensure the axial retention of the magnets and also serve to balance the rotor 12.

The stator 11 includes a main body 31 made of a set of metal plates, and a winding 32. The body 31 is formed by a stack of metal plates, which are held in groups by: suitable fastening systems, such as rivets.

The stator body 11 has tooth-delimiting recesses for fitting the windings 32. The windings 32 comprise phase winding assemblies which pass through the notches and form extended lugs (chignons) which project on either side of the stator body 11. In this case, the windings 32 are obtained from conductive elements in the form of pins, which are connected to each other, for example by welding. The windings 32 comprise two three-phase type phase windings connected in a star and/or delta shape. The phase outputs are designed to be connected to an electronic control module 34.

The electronic control module 34 comprises a heat sink 35, to which the power module 36 is fixed, in particular by screws, for example, on the heat sink 35. These power modules 36 incorporate, in a known manner, switches, for example in the form of MOS-type transistors, making it possible to ensure the control of the phase of the rotating electrical machine 10 in motor mode or alternator mode. The switching of these transistors is controlled by a control unit. The electronic control module 34 is mounted via a heat sink 35 against the rear surface of the lateral wall of the rear bracket 16.

Advantageously, the electric machine 10 comprises a cooling circuit 38, the circuit 38 having an input 39 for a cooling liquid (such as a water or oil based liquid) and an output 40. The cooling circuit 38 has a cooling chamber 41 provided in the mass body of the radiator 35 and a cooling chamber 42 surrounding the stator 11.

The cooling chamber 42 is defined by the outer periphery of the annular wall of the front supporter 15 and the inner periphery of the annular wall of the rear supporter 16. The cooling chamber 42 is closed at its axial ends by two O-ring type seals 46. The stator 11 is retractably mounted inside the front bracket 15 to establish close contact between the outer circumference of the stator body 11 and the inner circumference of the side wall of the front bracket 15.

As can be seen in fig. 3, the front end 47 of the shaft 13, which extends axially with respect to the bearing, has a spline 48, which in this case has an orientation that is axial with respect to the axis X. The splines 48 of the end of the shaft 13 mate with complementary splines 49 of the connecting portion 23. The splines 49 are provided in the inner periphery of the connecting portion 23, which has an annular shape and an axial orientation. Thus, the teeth of the splines 48, 49 of one of the elements penetrate into the space separating the teeth of the splines 48, 49 of the other element, and vice versa. This makes it possible to ensure a rotational mechanical connection between the shaft 13 and the connecting portion 23. The connecting portion 23 is also rotationally connected to the retarder element 22, in particular by a connection with splines.

At least one groove 51 is provided, the groove 51 being distinct from the splines 48 of the end of the shaft 13 and from the complementary splines 49 of the connecting portion 23, to accommodate a reservoir of lubricant, in particular grease. The purpose of this lubricant storage is to ensure lubrication between the end of the shaft 13 and the connecting portion 23.

As can be seen in fig. 4a, a recess 51 is provided in the end of the shaft 13. The recess 51 advantageously has an annular shape with an orientation different from the orientation of the splines 48 at the end of the shaft 13. The groove 51 is formed by a recess of the shaft 13, for example. The width and/or depth of the groove 51 is larger than the width and/or depth of the space between two teeth of the spline 48. As a modification, a groove 51 is provided on the inner periphery of the connecting portion 23.

Preferably, a plurality of grooves 51, in particular two or three, are provided. The number of grooves 51 and their dimensions are chosen to obtain a good compromise between the amount of lubricant stored in the grooves 51 and the mechanical rigidity of the connection between the shaft 13 and the connecting portion 23.

In the embodiment of fig. 4b, each groove 51 extends in a plane P1 orthogonal with respect to the axis X of the shaft 13, similar to the groove in fig. 4 a. The grooves 51 are parallel to each other.

In the embodiment of fig. 4c, each groove 51 extends on a respective plane P2 forming a non-zero angle with respect to a plane P1 orthogonal to the axis X of the shaft 13.

As a variant, the groove 51 may comprise a through hole, for example to communicate with a lubricant reservoir.

As a variant, the groove 51 has a spiral form.

It is to be understood that the foregoing description is provided by way of example only and is not limiting upon the scope of the invention, which is not to be construed as a departure from the invention by substitution of various elements with any other equivalent.

Furthermore, different features, variants and/or embodiments of the invention may be associated with each other according to different combinations, as long as they are not incompatible or mutually exclusive.