Rotating electrical machine with a casing for a reducer

Abstract

A rotating electric machine for an automobile is provided, which includes a casing for a reduction gear. [Solution] The invention primarily relates to a rotating electric machine (10), particularly for an automotive vehicle, having a first cooling chamber (114) configured to allow circulation of a coolant to ensure cooling of the stator, the machine being characterized in that the first cooling chamber (114) is defined by the inner surface of one bearing (17) and the outer surface of the other bearing (16), and that one of the bearings (16) extends into a casing (107) of the reducer (99), the casing (107) of the reducer (99) including at least one housing configured to receive at least one pinion of the reducer (99) for engagement with a corresponding pinion on the shaft of the rotating electric machine (10).

Description

Technical Field

[0001] The present invention relates to a rotating electrical machine provided with a speed reducer casing. The present invention is particularly advantageously applied to a high-power reversible electrical machine that can be connected to elements such as a speed reducer of a transmission and can operate in an alternator mode and an engine mode, but is not limited thereto.

Background Art

[0002] As is known per se, a rotating electrical machine includes a stator and a rotor coupled to a shaft. The stator is Substrate mounted in a casing designed to rotatably support the shaft via a spool therein.

[0003] The rotor includes a body made of a stack of sheet metals held in the shape of a package using a suitable fixing system. The rotor includes, for example, magnetic poles made of permanent magnets housed in cavities provided in the magnetic body of the rotor. Alternatively, in the case of a structure having so-called "salient" poles, the magnetic poles are formed from coils wound around the rotor arms.

[0004] On the other hand, the stator includes a body made of a stack of a plurality of sheet pieces forming a crown, and its inner surface is provided with notches opened inward to receive phase windings. The phase windings are obtained, for example, from enamel-coated continuous wires or conductive elements in the shape of pins connected to each other by welding. These windings are polyphase windings connected in star or delta, and their outlets are connected to an electric control module.

[0005] In some types of automotive drive systems that ensure the transmission of mechanical output from a heat engine to the vehicle wheels, a high-power reversible rotary electric machine is coupled to the vehicle's gearbox. In this case, the rotary electric machine is particularly suitable for operation in an alternator mode that supplies energy to, in particular, a battery and an in-vehicle electrical network, and in an engine mode, it is not only suitable for ensuring the starting of the heat engine but also for operation involved in driving the vehicle either alone or in combination with the heat engine.

SUMMARY OF THE INVENTION

[0006] According to one conventional assembly design, the Substrate of the electric machine is fixed to the gearbox casing using a screwing system after mechanically centering various elements. However, this assembly mode has several strict mechanical constraints.

[0007] The present invention aims to solve the above problems, in particular by proposing a rotary electric machine for a motor vehicle, which rotary electric machine - a stator, - a rotor attached to a shaft, - front Substrate and rear Substrate each configured to support a spool, with each spool rotatably supporting the shaft of the rotary electric machine, front and rear Substrate and, - a first cooling chamber configured to allow circulation of a coolant to ensure cooling of the stator, comprising, - the first cooling chamber being defined by the inner surface of one Substrate and the outer surface of the other Substrate and, - Substrate one of which extends to the casing of a gearbox, the casing of this gearbox including at least one receiving portion configured to receive at least one pinion of the gearbox for engagement with a corresponding pinion of the shaft of the rotary electric machine. In this way, the present invention provides for the SubstrateBy incorporating the function of the casing for the speed reducer of the transmission into one of them, the assembly of the transmission can be facilitated and the mechanical constraints in the assembly can be reduced.

[0008] According to one embodiment, the casing of the speed reducer includes fixing means configured to be able to fix the rotating electrical machine together with the corresponding second casing of this speed reducer.

[0009] According to one embodiment, the receiving portion for receiving the pinion is axially offset with respect to the opening provided for passing the shaft. Substrate

[0010] According to one embodiment, the stator is attached by shrink fitting to one of the above. Substrate

[0011] According to one embodiment, the front Substrate supports the casing of the speed reducer.

[0012] According to one embodiment, the rotating electrical machine includes an electric control module for controlling this rotating electrical machine.

[0013] According to one embodiment, the rotating electrical machine includes a radiator coupled to the electric control module.

[0014] According to one embodiment, the above radiator is fixed to the rear Substrate

[0015] According to one embodiment, the rotating electrical machine includes a second cooling chamber configured to be able to circulate a coolant for cooling the above radiator.

[0016] According to one embodiment, the second cooling chamber is formed inside the radiator.

[0017] According to one embodiment, the second cooling chamber is at the axial end face of the radiator and the rearSubstrate It is defined by the opposing surfaces thereof.

[0018] According to one embodiment, the rotary electric machine includes two Substrate packings disposed between them to ensure the sealing of the first cooling chamber.

[0019] The present invention will be better understood by reading the following description and referring to the accompanying drawings. These drawings are given by way of example only and do not limit the present invention in any way.

Brief Description of the Drawings

[0020]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6a

Figure 6b

Embodiments for Carrying Out the Invention

[0021] In the drawings, the same or similar or analogous elements are denoted by the same reference numerals. In the following description, the direction from front to rear from left to right in FIG. 2 is regarded as the forward direction. Therefore, the "front" element means an element disposed on the side of the front spool 77, and the "rear" element means an element disposed on the opposite side, that is, the side of the electric control module 40.

[0022] Figures 1 and 2 show a rotary electric machine 10 having a polyphase stator 11 surrounding a rotor 12, the rotor being attached to a shaft 13 having an X-axis corresponding to the axis of the electric machine. The stator 11 surrounds the rotor 12 while leaving a gap between the inner circumference of the stator 11 and the outer circumference of the rotor 12. The stator 11 is in front Substrate 16 and in the rear Substrate 17 and is mounted in a casing having them.

[0023] This electric machine 10 is configured to be connected to a speed reducer 99 arranged upstream of a transmission. The electric machine is particularly suitable for operation in alternator mode for supplying energy to a battery and an in-vehicle electrical network, and in engine mode, not only guarantees the starting of a heat engine of an automobile, but also is suitable for operations involved in driving a vehicle alone or in combination with a heat engine. The output of the electric machine can be in the range of, for example, 15 kW to 50 kW.

[0024] More specifically, the rotor 12 includes a body 22 in the shape of a seat package. Permanent magnets 23 are installed in the cavity of the body 22. The permanent magnets 23 can be composed of rare earths or ferrites depending on the desired application and output of the rotary electric machine. Further, the rotor 12 includes two brackets 26 that respectively abut against the axial end faces of the rotor 12. These brackets 26 ensure the axial fixation of the permanent magnets 23 and also play a role in placing the rotor 12 in an equilibrium state.

[0025] On the other hand, the stator 11 includes a body 27 made of a seat package and coils 28. The body 27 is formed from a laminate of sheet metal held in the shape of a package using a suitable fixing system.

[0026] The stator body 27 shown in FIG. 3 includes teeth 30 extending from the inner circumference of the annular yoke 31, and the teeth define two notches 32 each for attaching the coil 28 of the stator 11. Therefore, two consecutive notches 32 are separated by one tooth 30. The notches 32 communicate with the axial end faces in the axial direction and communicate with the inside of the stator body 27 in the radial direction.

[0027] The coil 28 includes a phase winding assembly 33 passing through the notches 32, and this assembly forms lead wires 36 protruding and extending on both sides of the stator body 27. The phase windings 33 are here obtained, for example, from pin-shaped conductive elements joined to each other by welding. These windings 33 are, for example, star-connected three-phase double windings.

[0028] For this reason, one end of the phase winding 33 is connected to the neutral point using a neutral bar 38 that ensures connection of the neutral points of the respective phase windings 33 to each other. The other ends 37 of these phase windings 33, so-called phase outlets, are configured to be connected to the electric control module 40 via an interconnector 41.

[0029] As can be seen from FIG. 5, the electric control module 40 includes a radiator 44, and an output module 45 is fixed to this radiator, for example, by screwing. These output modules 45 incorporate switches, for example, in the form of MOS transistors, which can ensure control of the rotating electrical machine 10 in the engine mode or the alternator mode as is known per se. The electric control module 40 is attached so as to abut against the back surface of the rear Substrate surface of the transverse wall 46 of 17.

[0030] For this reason, as shown in FIG. 3, here a substantially annular interconnector 41 includes terminals 48 configured to be connected to the phase outlets 37 and connection terminals 49 configured to be electrically connected to the legs 50 of the output module 45. In this way, the interconnector 41 can correspond the phase outlets 37 with the legs 50 of the output module 45 offset angularly with respect to the phase outlets 37.

[0031] Therefore, the terminal 48 is electrically connected to the connection terminal 49 through a pattern 52 in which a main body 53 made of an insulating material such as plastic is integrally formed (see FIG. 5). The integrally formed portion 54 where the connection terminal 49 protrudes axially from the annular portion of the interconnecter 41 and extends.

[0032] The interconnecter 41 is fixed to the front surface of the rearward Substrate 17 of the transverse wall 46 using an insert 57 for receiving a corresponding fixing member such as a screw. Therefore, since the interconnecter 41 is arranged away from the stator main body 11, its heating is significantly restricted.

[0033] Furthermore, in order to enable the terminal 49 of the interconnecter 41 to be arranged on the front surface of the leg portion 50 of the output module 45, the rearward Substrate 17 includes an opening 61 provided in the transverse wall 46 for passing the connection terminal 49 as shown in FIG. 5. These openings 61 are arranged facing corresponding openings 63 provided in the radiator 44 of the electric control module 40.

[0034] As can be seen from FIG. 1, the output shaft of the speed reducer 99 can include a fluted end portion 73 configured to engage with the correspondingly shaped fluted inner circumference of a sleeve arranged within the transmission. Thus, this enables the shaft 13 to be rotationally coupled to a sleeve having teeth on its outer circumference that cooperate with the teeth of the pinion of the transmission.

[0035] Forward Substrate 16 to ensure that the shaft 13 is rotatably assembled relative to the forward Substrate 16, the front spool 77 is arranged radially between the shaft 13 of the electromechanical device 10 and the forward Substrate 16. The front spool 77 can be, for example, a ball bearing or a needle roller bearing. Furthermore, as shown in FIG. 2, the rear spool 103 is assembled into a corresponding receiving portion 104 of the rearward

[0036] Advantageously, the electromechanical machine 10 is cooled by using a cooling circuit 109 through which a cooling liquid such as a liquid mainly composed of water or oil can flow inside the electromechanical machine. As can be seen from FIG. 5, the cooling circuit 109 includes an inlet 111 provided in the radiator 44, and this inlet circulates the cooling liquid through the cooling chamber 112 for cooling the radiator 44 to discharge the amount of heat generated by the electric control module 40.

[0037] The cooling chamber 112 can be incorporated into the radiator 44, that is, the cooling chamber 112 can be configured to define a hollow space inside the radiator 44 during the molding or processing of the radiator 44. Therefore, the cooling chamber 112 is defined by the inner surface of the radiator 44.

[0038] In a variant embodiment, the cooling chamber 112 is defined by the axial end face of the radiator 44 and the rear Substrate 17 opposing faces. One of these two parts may include a recess for defining the internal space of the cooling chamber 112. In that case, the sealing performance of the cooling chamber 112 is ensured by a packing.

[0039] When the cooling liquid circulates in the cooling chamber 112 of the radiator 44, the cooling liquid flows towards the chamber 114 defined by the front Substrate 16 and the rear Substrate 17. For this reason, the duct 115 communicates with the chamber 112 of the radiator 44 on one hand and communicates with the chamber 114 defined by the front Substrate 16 and the rear Substrate 17 on the other hand.

[0040] More specifically, as can be seen from FIGS. 1 and 2, the cooling chamber 114 is defined by the outer periphery of the side wall 125 of the front Substrate 16 and the inner periphery of the side wall 117 of the rear Substrate 17. This cooling chamber 114 is closed at its axial ends by two O-ring type packings 128. The stator 11 is arranged such that there is close contact between the outer periphery of the stator body 11 and the inner periphery of the side wall of the front Substrate 16Substrate It is attached by shrink fitting inside 16.

[0041] The duct 115 is located at the rear Substrate and is provided on the side wall 117 of 17, that is, the wall defining the duct 115 is integral with the side wall 117 of 17 at the rear Substrate and is integral with the side wall 117 of 17. The duct 115 is obtained, for example, by forming or processing the side wall 117 of 17 at the rear Substrate and is obtained by forming or processing the side wall 117 of 17.

[0042] The coolant circulates in the chamber 114 extending around the stator 11 to ensure cooling over approximately 360°, and is then discharged through the liquid outlet 121 as can be seen from FIG. 1.

[0043] More specifically, as shown in FIGS. 6a and 6b, at the front Substrate 16 is open at its front end side and includes a cylindrical side wall 125 having a bottom 101 at its front end side. The bottom 101 has a central opening 102 for passing through the shaft 13 of the electromechanical machine.

[0044] At the front Substrate the bottom 101 of 16 extends to the casing 107 of the speed reducer 99. Thus, the casing 107 of the speed reducer 99 is integral with 16 at the front Substrate and the corresponding parts are obtained, for example, by forming or processing.

[0045] This casing 107 includes a wall 108 formed thicker than the bottom 101 and a receiving portion 110 configured to receive the pinion of the speed reducer 99 for engaging with a corresponding pinion rotatably coupled to the shaft 13 of the electromechanical machine. The pinion rotatably coupled to the shaft 13 is received in a second receiving portion 113 coaxial with the opening 102. This pinion can be composed of a section of the shaft 13 with flutes or a fitting pinion rotatably coupled and assembled to the shaft 13. As shown in FIG. 1, the pinion of the speed reducer 99 can be attached to the shaft 116 having an end portion 73 with flutes for engaging with the toothed sleeve of the transmission.

[0046] The receiving part 110 is axially offset with respect to the opening 102 provided in the front 16 for passing the shaft 13. In other words, the axis of the receiving part 110 is offset with respect to the axis X of the shaft 13. As can be seen from FIG. 6b, this offset is made such that a part of the transverse wall 108 of the casing 107 protrudes radially from the bottom 101 of the front 16. Substrate Substrate

[0047] The receiving parts 110, 113 can have an inner circumference with a stepped diameter. Therefore, the receiving parts 110, 113 have shoulders 118 for mounting the pinions to be received.

[0048] As shown in FIG. 1, the casing 107 includes fixing means 119 configured to fix the electric machine 10 together with the corresponding second casing 122 of the speed reducer 99. Therefore, the second casing 122 can close the open space of the casing 107 that defines the receiving parts 110, 113. These fixing means 119 are composed of protruding ear-shaped parts with holes opened from the outer circumference of the wall 108 of the casing 107. Through these ear-shaped parts 119, fixing members 124 such as screws can pass through, and this fixing member penetrates the corresponding hole-opened ear-shaped parts of the second casing 122.

[0049] The second casing 122 also includes a hole-opened protruding ear-shaped part 126 provided with an opening for passing a fixing member 127 such as a screw, which can fix the second casing 122 together with an element of the transmission.

[0050] As can be seen from FIG. 6a, ribs 129 can also be provided around the wall 108 of the casing 107 to reinforce the assembly.

[0051] ​​Of course, the above description is merely an example and does not limit the scope of the present invention. Replacing each element with any other equivalent will not depart from the scope of the invention. The present invention can also be used in a simple casing of a rotating electrical machine having only a spool support without forming a part of the cooling chamber.

[0052] Furthermore, various features, modifications and / or embodiments of the present invention can be combined with each other according to various combinations as long as they are compatible with each other and not exclusive.

Claims

1. A rotating electrical machine (10) particularly for a motor vehicle, - a stator (11), - a rotor (12) attached to a shaft (13), - a front support (16) and a rear support (17) each configured to support a spool (77, 103), wherein each spool (77, 103) rotatably supports the shaft (13) of the rotating electrical machine (10), the front support and the rear support, - a first cooling chamber (114) configured to allow circulation of a coolant to ensure cooling of the stator (11), - an electric control module (40) of the rotating electrical machine (10), - a radiator (44) coupled to the electric control module (40), - a second cooling chamber (112) configured to allow circulation of a coolant for cooling the radiator (44), - a duct (115) provided on a side wall (117) of the rear support (17), comprising, - a side wall (125) of the front support (16) surrounds the stator (11), - a side wall (117) of the rear support (17) surrounds the side wall (125) of the front support (16), - the first cooling chamber (114) is defined by an outer circumference of the side wall (125) of the front support (16) and an inner circumference of the side wall (117) of the rear support (17), - the radiator (44) is fixed to the rear support (17), - the duct (115) communicates with the second cooling chamber (112) on one hand and with the first cooling chamber (114) on the other hand, The rotating electrical machine is cooled using a cooling circuit (109) through which a coolant can circulate. The cooling circuit (109) includes an inlet (111) provided in the radiator (44) to discharge the amount of heat generated in the electric control module (40). The inlet circulates the coolant through the second cooling chamber (112) to cool the radiator (44), When the coolant circulates in the second cooling chamber (112), it flows toward the first cooling chamber (114) and circulates in the first cooling chamber (114), The rotating electrical machine is characterized in that the coolant is discharged through an outlet (121) provided in the rear support (17).

2. The rotating electrical machine according to claim 1, wherein the wall defining the duct (115) is a monoblock with the side wall (117) of the rear support (17).

3. The rotating electrical machine according to claim 1 or 2, wherein the first cooling chamber (114) extends around the stator (11) to ensure that the coolant cools the stator over 360°.

4. The rotating electrical machine according to any one of claims 1 to 3, wherein the second cooling chamber (112) is formed inside the radiator (44).

5. The rotating electrical machine according to any one of claims 1 to 3, wherein the second cooling chamber (112) is defined by an axial end face of the radiator (44) and a facing surface of the rear support (17).

6. The rotating electrical machine according to any one of claims 1 to 5, further comprising a packing (128) disposed between the front support (16) and the rear support (17) to ensure the sealing performance of the first cooling chamber (114).

7. One of the front support (16) and the rear support (17) is extended to the casing (107) of the speed reducer (99), and the casing (107) of the speed reducer (99) is configured to receive at least one pinion of the speed reducer (99) for engaging with a corresponding pinion of the shaft (13) of the rotary electric machine (10), and includes at least one receiving portion (110). The rotary electric machine according to any one of claims 1 to 6.

8. The rotary electric machine according to claim 7, wherein the front support (16) supports the casing (107) of the speed reducer (99).

9. The rotary electric machine according to claim 7 or 8, wherein the casing (107) of the speed reducer (99) is a monoblock with the front support (16).

10. - The front support (16) includes a bottom (101) on the front end side, and the bottom (101) has a central opening (102) for passing the shaft (13). - The casing (107) includes a wall (108) formed thicker than the bottom (101) and a receiving portion (110) configured to receive a pinion of the speed reducer (99) for engaging with a corresponding pinion rotatably coupled to the shaft (13). The rotary electric machine according to any one of claims 7 to 9.

11. The rotary electric machine according to any one of claims 7 to 10, wherein the receiving portion (110) for receiving the pinion is axially offset with respect to the opening (102) provided in the front support (16) for passing the shaft (13).

12. The rotary electric machine according to claim 10 or 11, wherein the casing (107) of the speed reducer (99) includes fixing means (119) configured to fix the electric machine together with a corresponding second casing (122) of the speed reducer (99).

13. The rotary electric machine according to claim 12, wherein the fixing means (119) is composed of a protruding lug with a hole formed from the outer periphery of the wall (108) of the casing (107).

14. The rotary electric machine according to any one of claims 1 to 13, wherein the stator (11) is attached to one of the front support (16) and the rear support (17) by shrink fitting.

Images