FR3058846A1 - ROTATING ELECTRICAL MACHINE COMPRISING A ROTOR SHAFT AND A BEARING - Google Patents

Abstract

A rotating electrical machine (100) comprising: a rotor (2) rotating about an axis X, the rotor comprising a rotor shaft (3); a stator (50) surrounding the rotor (2); a casing (1) in which the stator (50) and the rotor (2) are disposed, and a bearing (20) comprising an inner ring (20a) and an outer ring (20b), the inner ring (20a) being integral with the shaft (3), the rotor shaft (3) being rotatably mounted with respect to the housing (1) via the bearing (20). It is provided that the electric machine comprises indexing means and fastening (218) the outer ring (20b) relative to the housing (1), the indexing and securing means comprising a locking member (204) provided with a first end (204a) and a first hole (214); ) to cooperate with the first end (204a) of the locking member (204).

Description

Holder (s): VALEO ELECTRIC EQUIPEMENTS MOTOR Simplified joint-stock company.

Extension request (s)

Agent (s): VALEO EQUIPEMENTS ELECTRIQUES MOTOR Simplified joint-stock company.

ROTATING ELECTRIC MACHINE COMPRISING A ROTOR SHAFT AND A BEARING.

FR 3 058 846 - A1

Rotating electric machine (100) comprising:

a rotor (2) rotating around an axis X, the rotor comprising a rotor shaft (3);

a stator (50) surrounding the rotor (2);

a housing (1) in which the stator (50) and the rotor (2) are arranged, and

-a bearing (20) comprising an inner ring (20a) and an outer ring (20b), the inner ring (20a) being integral with the shaft (3), the rotor shaft (3) being mounted rotating relative to the casing (1) via the bearing (20),

It is intended that the electric machine comprises means of indexing and securing (218) of the outer ring (20b) relative to the casing (1), the means of indexing and securing comprising a blocking member (204) provided with a first end (204a) and a first hole (214) to cooperate with the first end (204a) of the locking member (204).

206

ROTATING ELECTRIC MACHINE COMPRISING A ROTOR SHAFT AND A BEARING

TECHNICAL FIELD OF THE INVENTION

The present invention relates to a rotary electrical machine intended for motor vehicles.

TECHNOLOGICAL BACKGROUND

In known manner, rotary electrical machines comprise two coaxial parts, namely a rotor and a stator surrounding the rotor body.

Referring to Figure 1, there is shown an example of such a rotary electrical machine referenced 100, in the case of an alternator with internal ventilation of the polyphase type for a motor vehicle with thermal engine operating in alternator mode. Of course, the alternator can also be reversible and consist of an alternator-starter also operating in electric motor mode, in particular for starting the engine of the vehicle as described in document FR A 2 745 445 for propelling the motor vehicle.

This machine 100 essentially comprises a casing 1 and, inside thereof, a rotor 2 integral in rotation with a central shaft 3, called the rotor shaft or shaft, and a stator 50 of annular shape. The stator 50 surrounds the rotor 2 with the presence of an air gap 110 and comprises a body 4 in the form of a sheet package provided with notches, for example of the semi-closed type, for mounting a stator winding 5 forming on either side of the stator body 4, at each axial end thereof, a front bun 51 and a rear bun 53 which project axially from two axial faces 101 and 102 of the stator body.

In other words, the rotating electric machine includes:

-a rotor 2 rotating around an axis X

a stator 50 surrounding said rotor 2, the space between the rotor 2 and the stator 50 defining an air gap 110 of the machine and the notches of the stator 50 are for example open on the side of the air gap.

This winding 5 comprises for example a set of three-phase windings in star or in triangle, the outputs of which are connected to a rectifier bridge, visible partially at 52, comprising rectifier elements such as diodes or transistors of the MOSFET type, in particular when the machine consists of an alternator-starter.

For example, the windings of the winding 5 are obtained using a continuous wire, electrically conductive, coated with an electrically insulating layer, such as enamel, and mounted in the relevant notches of the body 4 of the stator 50 via notch insulators (not visible).

It is also possible to provide that the winding 5 includes pins also called conductor or u-pin segment in English terms well known to those skilled in the art.

According to a variant, the winding 5 comprises two sets of three-phase windings to form a device for composite stator windings, the windings being offset by thirty electrical degrees as described for example in documents US-A1-2002 / 0175589, and FR -A-2,784,248. In this case two rectifier bridges are provided and all combinations of three-phase star and / or triangle windings are possible. As a variant, the stator winding is of the five-phase type.

In general, the alternator is of the polyphase type and the rectifier bridge (s) make it possible in particular to rectify the alternating current produced in the windings of the stator 50 with direct current in particular for charging the battery of the motor vehicle and supplying the loads and the electrical consumers in the on-board network of the motor vehicle.

The rotor 2, of annular shape, is produced in the example shown in the form of a claw rotor, as described for example in documents US-A1 -2002/01 75589, comprising two pole wheels 7,8 here axially juxtaposed and each having a transverse annular flange provided at its outer periphery with claws 9.

Each claw 9 has a rooting section of transverse orientation in the plane of the flange concerned. This rooting section is extended at its outer periphery by a claw tooth of generally axial orientation with the presence of a chamfer between the claw tooth and the rooting section.

The claw teeth are generally trapezoidal or triangular in shape. The claw teeth of a pole wheel 7, 8 are directed axially towards the flange of the other pole wheel 8, 7; the claw tooth of a wheel 7, 8 penetrating into the space existing between two adjacent claw teeth of the other wheel 8, 7 so that the claw teeth of the wheels 7, 8 are nested. For more details, see document EP 051 5 259.

An excitation winding 10 is installed axially between the flanges of the wheels 7, 8. It is carried by a rotor part 2 in the form of a cylindrical annular core coaxial with the shaft 3. The core of FIG. 1 is constituted of two axially distinct sections, each of which is produced integrally with an associated pole wheel 7, 8. According to a variant not shown, the central core consists of a single piece and it is distinct from the pole wheels 7, 8 which are arranged axially on either side of the core.

The winding 10 is therefore located in the space radially delimited by the claws 9 of the wheels 7,8 and the central core.

The wheels 7, 8 and the core are preferably made of ferromagnetic material and are traversed coaxially by the rotor shaft 3 also made of ferromagnetic material. These wheels 7, 8 are integral with the shaft 3. For this purpose, each wheel 7, 8 has a central bore which passes axially through the flange and extends the bore of the part of the core concerned. The shaft 3 has knurled portions (not referenced) and is force-fitted into the aforementioned bores of the core and of the wheels 7, 8 so that it cuts grooves through its knurled portions. The shaft 3 is thus integral in rotation and axially with the wheels, a spacer, not referenced, being interposed between the wheel 7 and a bearing 19 described below.

The axis of the shaft 3 constitutes the axis X of the machine. The winding wire 10 is wound on a support of electrically insulating material (not shown) mounted, preferably by force, on the outer periphery of the core.

When the excitation winding 10 is activated, that is to say electrically powered, the wheels 7, 8 and the core are magnetized and the rotor 2 becomes an induction rotor with the formation of magnetic poles at the claws 9 of the wheels 7, 8.

This inductor rotor 2 creates an alternating induced current in the stator 50 when the shaft 3 rotates.

Furthermore, it is also known from the prior art, rotary electrical machines which include a different type of rotor than the claw rotor. For example, the rotor 2 may comprise a body formed by a stack of sheets of sheets held in the form of a package by means of a suitable fixing system, such as rivets axially passing through the rotor from side to side. The rotor may in particular comprise poles formed for example by permanent magnets housed in cavities formed in the magnetic mass of the rotor, as described for example in document EP0803962.

The shaft 3 of the rotor 2 carries at its front end a movement transmission member 12, here a pulley 12 belonging to a movement transmission device via at least one belt (not shown) between the alternator and the engine of the motor vehicle. This shaft carries at its rear end slip rings 13 connected by wire connections (not shown) at the ends of the excitation winding 10 of the rotor 2.

As a variant, the pulley 12 is replaced by a gear and the transmission device is chain and / or gear.

Brushes belong to a brush holder generally represented by the reference 14 and they are arranged so as to rub on the slip rings

13, in order to supply the winding 10 with electric current. The brush holder 14 is connected to a voltage regulator (not shown).

The casing 1 in which the rotor 2 and the stator 50 are placed here is in two parts, namely a front flange 16 adjacent to the pulley 12 and a rear flange 17 carrying the brush holder 14 and most often the bridge (s) rectifiers and the voltage regulator, the rectifier bridge (s) and the voltage regulator forming an electronic part of the machine. The annular flanges 16, 17, for example based on aluminum, are hollow in shape and each carry a central ball bearing 19 and 20 respectively for the rotational mounting of the shaft 3 of the rotor 2. The flanges are assembled together using tie rods or screws as visible for example in Figure 1 of the aforementioned document EP 0515 259. In other words, the casing 1 of the machine 100 comprises the front flange 16 also called the front bearing and the rear flange 17 also the rear bearing.

As illustrated in FIG. 1, an elastic system for filtering vibrations can be provided at the outer periphery of the body 4 of the stator, in the form of a sheet bundle, with a flat seal 40 at the front and at the rear pads 41, flexible and thermally conductive resin being interposed between the front flange and the stator body to dissipate the heat.

As a variant, no seals are provided. In all cases, the stator is fixedly carried by the casing 1, while the rotor 2 is carried centrally in rotation by the casing 1 via the bearings 19, 20.

As a variant, the casing is in three parts, the flanges 16, 17 being arranged on either side of a central bearing carrying the stator body. The flanges are assembled to the intermediate part, for example by screwing.

The alternator also includes means for cooling it. To this end, in FIG. 1, the flanges 16, 17 are perforated to allow cooling of the alternator by air circulation and the rotor 2 carries at least at one of its axial ends a fan intended to ensure this air circulation. Here a first fan 23 is provided on the front end face of the rotor 2 and a second fan 24, on the rear face of the rotor 12.

Each fan 23, 24 is of annular shape and is provided with a plurality of blades 26 and is fixed on the external radial faces of the flanges of the wheels 7, 8.

The fans are for example metallic and are obtained with their blades 26 by cutting and folding. The fans 23, 24 are for example of the centrifugal or helico-centrifugal type.

With reference to FIG. 1, the air is sucked in through openings 60 of the front flange surrounding the pulley 12 at the front of the flange, then is mainly ejected centrifugally by the blades 26 and passes into the space between the front bun 51 and the front flange 16 to cool the front bun and finally exit through openings 61 on the outer radial periphery of the front flange. The rear flange 17 also has a plurality of air inlet and outlet ports.

It is also known from the prior art, rotary electrical machines which are cooled by a liquid as described in the document FR2717638.

In Figure 1, the brush holder 14 and the voltage regulator, integral with the flange 17, are capped by a cover 70, integral with the rear flange 17 by being fixed here on the latter by snap-fastening on studs 71 integral with the flange back. This cover 70 also has air intake orifices, not visible in FIG. 1.

The rotary electric machine may take the form of an alternator, as described for example in documents EP 0 803 962 and WO 02/093717, or an electric motor as described for example in document EP 0 831 580.

The alternator may be reversible as described for example in documents WO 01/69762, WO 2004/040738, WO 2006/129030 and FR 3 005 900.

Such a reversible alternator is called an alternator-starter. It allows, on the one hand, to transform mechanical energy into electrical energy when it operates in alternator mode in particular to supply consumers and / or recharge a battery and on the other hand to transform electrical energy into energy mechanical when operating in electric motor mode, in particular to start a heat engine such as that of a motor vehicle or to participate in the propulsion of the motor vehicle.

In any event, when these rotary electrical machines are used in motor mode, their control carried out for example by the electronic part may require having precise information on the angular position of the rotor relative to the stator.

For this, rotor angular position detectors can be used. These rotor angular position detectors comprise, for example, an annular target mounted on a target holder integral in rotation with the rotor or the machine shaft, and at least one fixed sensor, for example of the Hall effect type, disposed near the target.

The target has a magnetic field which varies around its periphery so that under the effect of the rotation of the target the magnetic field received by the at least sensor varies.

The at least sensor is connected to an electronic management and control device, and transmits signals to the latter as a function of the magnetic fields received, this device processing said signals to deduce the angular position as well as the speed of the rotor.

There are other types of rotor angular position detectors, for example, of the resolver type or of the angular sensor type known to those skilled in the art. However, it is in all cases a sensor which receives a magnetic field coming from a target.

This type of machine is satisfactory, however it may be desirable to improve it further.

Indeed, the mounting of ball bearings 19 and 20 is not always simple. In particular the inner ring of the rear ball bearing 20 is mounted tightly on the shaft 3. This implies constraints on this bearing which are very high, it is then not possible to tightly mount the outer ring of the bearing in the housing. .

As a result, a problem may appear on the outer ring of the bearing. More specifically, the outer ring may in particular have a slight rotational movement around the axis X relative to the casing.

This movement is particularly detrimental in the case where the rotary electric machine comprises a rotor angular position detector.

In fact, the rotor angular position detector comprises a sensor linked to the outer ring of the rear ball bearing 20 and a target linked to the inner ring of the rear ball bearing 20, so that the slight movement of the outer ring around the X axis relative to the casing will disturb the angular position detected by this detector.

There is therefore a need for a rear bearing which is indexed in rotation in the casing so as to suppress the rotation of its outer ring around the axis X relative to the casing and this by exerting moderate mechanical stresses on the bearing.

OBJECT OF THE INVENTION

The object of the invention is to respond to this wish while remedying at least one of these aforementioned drawbacks.

According to the invention, a rotary electrical machine is proposed comprising:

a rotor rotating around an axis X, the rotor comprising a shaft;

a stator surrounding the rotor;

a housing in which the stator and the rotor are arranged, and

-a bearing comprising an inner ring and an outer ring, the inner ring being secured to the shaft, the shaft being rotatably mounted relative to the casing via the bearing.

According to a general characteristic, the rotary electric machine comprises means of indexing and securing the outer ring relative to the casing, the indexing and securing means comprising a blocking member provided with a first end and a first hole to cooperate with the first end of the blocking member.

Thus, with on the one hand a first hole arranged on the outer ring or on a component linked to the outer ring, the first end of the blocking member cooperating with the first hole, and on the other hand the blocking which is for example linked to the housing, the outer ring can be blocked in rotation relative to the housing.

This is advantageous because with the machines of the state of the art when the rotor turns at speeds of the order of several thousand revolutions per minute, small displacements of the outer ring relative to the casing are possible. These include rotational movements around the X axis.

In any case, it is an alternative to the tight mounting of the outer ring inside the housing. Indeed, this tight assembly implies too great mechanical stresses on the bearing. According to this alternative, it is thus possible to provide a mechanical mounting avoiding rotation about the X axis and which exerts little mechanical stress on the bearing.

The term “cooperation of an end with a hole or a groove” is understood to mean that the end is received in the hole or the groove so that the component in which the hole is arranged is locked in rotation relative to the member blocking along at least one axis relative to the end.

The term “indexing” and “securing” of the outer ring relative to the casing is understood to mean, for example, the fact that the outer ring cannot rotate about the axis X relative to the casing so that their relative positions in rotation about the axis X are fixed.

According to other characteristics taken individually or in combination:

the blocking member is molded in the casing so that its first end comes from the casing and forms a stud cooperating with the first hole.

It is an embodiment which has good durability and which is easy to implement when molding the casing. For example, the casing comprises three parts, namely a central bearing, a front flange and a rear flange. According to this example, the blocking member can be molded in the rear flange of the casing.

In addition, it is no longer necessary to provide a hole in the housing, which can allow a second, more resistant housing.

the blocking member comprises a second end, said second end being able to cooperate with a hole or a groove.

Thus, the blocking member has two ends and is interposed between a first hole which can be arranged on the outer ring or on a component linked to the outer ring and a hole or a groove.

the machine comprises a positioning capsule for positioning the outer ring relative to the casing, the bearing being disposed in the capsule and the indexing and securing means comprise a second hole arranged in the capsule to cooperate with the second end of the blocking member.

This positioning capsule avoids tight fitting the outer ring of the bearing in the housing while allowing positioning of the bearing relative to the housing. It therefore makes it possible to reduce the forces on the bearing and in particular on its outer ring.

However, the bearing being for example mounted sliding in the capsule, this capsule does not allow without the securing and indexing means to block the rotation of the bearing relative to the casing.

According to this embodiment, with a second hole on the capsule, the connection between the second hole and the second end of the blocking member can block the outer ring relative to the capsule in rotation about the X axis.

Thus by receiving the first end in the outer ring or in a component linked to the outer ring and the second end in the capsule, the outer ring is secured and indexed relative to the capsule. For example, the capsule is locked in rotation relative to the housing so that the outer ring can be locked in rotation relative to the housing.

-the indexing and securing means comprise a second hole arranged in the casing to cooperate with the second end of the blocking member.

It is an embodiment for directly indexing the outer ring relative to the casing as long as the first end cooperates with a first hole provided in the outer ring or in a component linked to the outer ring.

According to a first example of this embodiment, the indexing and securing means comprise a single second hole arranged in the casing.

According to a second example of this embodiment, the indexing and securing means comprise two second holes, one in the casing and another in the capsule. In this case, the second end cooperates with the two second holes, that is to say that the second end will be received in the two second holes. For this, it can, for example, cross the second hole of the capsule to arrive at the second hole of the housing.

the indexing and securing means comprise a groove arranged in the casing to cooperate with the second end of the blocking member.

According to a first example of this embodiment, the indexing and securing means comprise a groove provided in the casing without necessarily having a second hole in the capsule.

According to a second example of this embodiment, the indexing and securing means comprise a groove arranged in the casing and a second hole arranged in the capsule. In this case, the second end cooperates with the second hole and the groove, that is to say that the second end will be received in the second hole and the groove. For this, it can, for example, cross the second hole to reach the groove.

the casing comprises a molded part and the indexing and securing means comprise a second hole arranged in said molded part to cooperate with the second end of the blocking member.

Thus, instead of providing the second hole in the casing, provision is made for overmolding a part in the casing and it is in this overmolded part that a second hole will be arranged. It is no longer necessary to provide the second hole in the casing, which can allow a second, more resistant casing and a second hole which is simpler to make.

According to a first example of this embodiment, the indexing and securing means comprise a single second hole arranged in the molded part.

According to a second example of this embodiment, the indexing and securing means comprise two second holes, one in the molded part and another in the capsule. In this case, the second end cooperates with the two second holes, that is to say that the second end will be received in the two second holes. For this, it can, for example, cross the second hole of the capsule to arrive at the second hole of the molded part.

-the rotating electric machine comprises a housing mounted on the outer ring of the bearing and a rotor angular position detector, the detector comprises a sensor linked to the outer ring and a target linked to the inner ring, said rotor angular position position detector being disposed in the housing.

This embodiment is advantageous because the blocking in rotation of the outer ring relative to the casing allows in the case where a rotor position detector is used to significantly improve the accuracy of the detected position.

the housing comprises a sleeve accommodating wires for the angular position detector, said first hole being arranged in the sleeve.

Thus, the sleeve being a component of the housing itself mounted on the outer ring of the bearing, the first hole is therefore arranged in a component linked to the outer ring. So that, in this case, by making the first end cooperate with the first hole, one can index and secure the outer ring relative to the blocking member.

-the blocking member is a pawn, a screw or a rivet.

These are easy-to-implement embodiments, using simple components as the locking member.

BRIEF DESCRIPTION OF THE FIGURES

Other characteristics and advantages of the invention will appear on examining the detailed description of modes of implementation and embodiments, in no way limiting, and the appended drawings in which:

FIG. 1, already described, is a section through an electric machine according to the state of the art;

FIG. 2 is a perspective view of an electric machine according to an embodiment of the invention;

FIG. 3 is a perspective view of a part of the electric machine according to an embodiment of the invention;

FIG. 4 is a perspective bottom view of a part of the electric machine according to an embodiment of the invention;

FIG. 5 is a section of a part of the electric machine according to an embodiment of the invention; and

FIG. 6 is a section of a part of the electric machine according to an embodiment of the invention.

Identical, similar, or analogous elements keep the same reference from one figure to another.

DESCRIPTION OF EXAMPLES OF EMBODIMENT OF THE INVENTION

Figure 2 is a perspective view of an electric machine according to an embodiment of the invention.

As can be seen in FIG. 2, the electric machine 100 comprises a casing 1. For example, the casing 1 comprises a front flange 16, a central bearing surface 200 and a rear flange 17. The casing 1 is covered with a cover 70, for example plastic, in which the electronic part of the electric machine is placed.

Provision is made in the housing 1 for a rotor 2 and a stator 50 similar to those of the state of the art described with reference to FIG. 1.

For example, the stator can be placed inside the central range 200 which will thus carry the stator body 4. In addition, the stator 50 can surround the rotor 2.

In other words, the machine 100 includes:

a rotor 2 rotating around an axis X, the rotor comprising a rotor shaft 3 also called the shaft 3;

a stator 50 surrounding the rotor 2;

a casing 1 in which the stator 50 and the rotor 2 are arranged.

Furthermore, the machine 100 includes two sockets 201 and 202 allowing the circulation of a cooling liquid from the electric machine 100.

Figure 3 is a perspective view of a part of the electric machine 100 according to an embodiment of the invention. In this view, the cover 70 and the rear flange 17 are removed so that it can be seen that the electric machine 100 comprises a positioning capsule 211.

The positioning capsule 211 comprises a lug 207 whose operation will be explained in the following figure. The function of the positioning capsule 211 is to be able to position a bearing 20 (not visible in FIG. 3) relative to the casing 1 as explained in FIGS. 5 and 6.

The electric machine 100 comprises a box 209, this box 209 further comprising a sleeve 206 which receives a tube 205.

It can also be seen in FIG. 3 that the electric machine comprises a locking member 204.

Figure 4 is a bottom perspective view of part of the electric machine according to an embodiment of the invention. In this figure, it can be seen that the flange 17 includes a bearing surface 219.

The capsule 211 is mounted in the bearing surface 219 which includes a notch 208 for cooperating with the lug 207 of the positioning capsule 211. Thus, the positioning capsule 211 is locked in rotation around the axis X relative to the housing 1.

Furthermore, the axial displacement of the capsule 211 relative to the casing 1 can be limited because in a first axial direction it is supported on the bearing 20 and that in the other axial direction the lug 207 of the capsule 211 is held by the notch 208.

FIG. 5 is a section of a part of the electric machine 100 according to an embodiment of the invention.

The electric machine comprises a stator 50 provided with a stator body 4. In the notches of the stator body 4 is housed a winding comprising wires or output notches 210 for connecting the winding to the electronic part of the machine. This electronic part is arranged in the cover 70.

In FIG. 5, one can see the bearing 20 by which the rotor shaft 3 is mounted rotating relative to the casing 1. This bearing comprises an inner ring 20a and an outer ring 20b, the inner ring 20a being integral with the shaft 3. For example, the inner ring 20a is mounted tightly on the shaft 3.

The bearing 20 can be slidably mounted in the positioning capsule 211 by means of its outer ring 20b. The bearing and its outer ring are thus positioned relative to the casing 1 and in particular relative to the bearing surface 219. In addition, the bearing 20 is housed in the positioning capsule 211.

We can see in Figure 5 that the housing 209 accommodates a rotor angular position detector 215. More specifically, the housing 209 comprises a frame 203 for example of metal or steel forming a housing for the angular position detector 215. This frame 203 is mounted on the outer ring of the bearing 20b. Thus, the housing 209 is mounted on the outer ring of the bearing 20b.

The rotor angular position detector 215 comprises a sensor 212 linked to the outer ring 20b and a target 213 linked to the inner ring 20a.

The sleeve 206 is for example made of plastic and comprises a first circular part 206.1 mounted on the frame 203 of the housing and a second part 206.2 having the shape of a rectangular parallelepiped.

The sleeve 206 receives the detector wires. More precisely, the second part 206.2 of the sleeve receives the tube 205 in which the wires of the angular position detector 215 are arranged.

FIG. 5 also illustrates the indexing and securing means 218 of the outer ring 20b relative to the casing 1. These indexing and securing means 218 are described in more detail according to an embodiment in FIG. 6 which is a section of a part of the electric machine according to an embodiment of the invention.

The indexing and securing means 218 comprise the locking member 204 provided with a first end 204a and with a first hole 214, the first end 204a cooperating with the first hole 214.

As illustrated in FIG. 6, the sleeve 206 can comprise the first hole 214. For example, this first hole 214 is arranged in the second part 206.2 of the sleeve.

Thus, the housing 209 being mounted on the outer ring 20b of the bearing, the first end 204a of the locking member 204 can be made to cooperate with a first hole arranged in a component which is linked in particular in rotation about the axis X with the outer ring 20b of the bearing 20.

As illustrated in FIG. 6, provision can be made for the locking member 204 to comprise a second end 204b, said second end 204b being able to cooperate with a hole or a groove.

In a first case, the capsule 211 comprises a second hole 216 for cooperating with the second end 204b of the locking member 204. In other words, the second hole 216 is arranged in the capsule 211.

In a second case, the casing 1 comprises a second hole to cooperate with the second end 204b of the locking member 204. In other words, the second hole is arranged in the casing 1. It could also be provided that a groove 217 is arranged in the casing 1, for example in the bearing surface 219 of the casing 1.

In a third case, illustrated in FIG. 6, a second hole 216 is arranged in the capsule and a groove 217 is arranged in the bearing surface 219 of the casing 1. It could also be provided that the capsule 211 and the casing 1 each comprise a second hole for cooperating with the second end 204b of the locking member 204.

According to this third case, the second end will be received in the two second holes or in a second hole and a groove. For this, it can, for example, pass through the second hole 216 of the capsule to reach the second hole in the casing or the groove 217 in the casing.

In all cases, the indexing and securing means 218 make it possible to make the second end 204b of the locking member 204 cooperate with a hole or a groove arranged in a component which is either the casing or is linked in rotation around the X axis with the housing. Indeed, as we have seen with reference to FIG. 4, the positioning capsule 211 is locked in rotation about the axis X relative to the casing 1 with the lug 207 and the notch 208.

Thus, with on the one hand the first end 204a of the locking member 204 cooperating in a first hole 214 arranged in a component linked in particular in rotation about the axis X with the outer ring 20b and with on the other hand, the second end 204b of the blocking member 204 cooperating with a second hole 216 or a groove 217 arranged in a component which is either the casing 1 or is linked in rotation around the axis X with the casing 1, the rotation around the axis X of the outer ring 20b relative to the casing 1.

This prevents, in particular when the rotor rotates at speeds of the order of several thousand revolutions per minute, small displacements of the outer ring relative to the housing are not possible.

For example, the locking member 204 is a pin, a screw or a rivet.

According to another embodiment, not illustrated in FIG. 6, the locking member 204 is molded in the casing 1 so that its first end 204a comes from the casing 1 and forms a stud cooperating with the first hole 214.

One could also provide that the casing 1 comprises a molded part, said molded part being linked in rotation about the axis X with the casing and comprising a second hole for cooperating with the second end 204b of the locking member 204.

Claims (10)

1. Rotating electric machine (100) comprising: a rotor (2) rotating around an axis X, the rotor comprising a shaft (3); a stator (50) surrounding the rotor (2); a housing (1) in which the stator (50) and the rotor (2) are arranged, and -a bearing (20) comprising an inner ring (20a) and an outer ring (20b), the inner ring (20a) being integral with the shaft (3), the shaft (3) being rotatably mounted relative to the housing (1) via the bearing (20), characterized in that it comprises means of indexing and securing (218) of the outer ring (20b) relative to the casing (1), the means of indexing and joining comprising a blocking member (204) provided with a first end (204a) and a first hole (214) for cooperating with the first end (204a) of the blocking member (204). 2. Rotating electric machine (100) according to claim 1, characterized in that the locking member (204) is molded in the casing (1) so that its first end (204a) comes from the casing (1) and forms a stud cooperating with the first hole (214). 3. Rotating electric machine (100) according to claim 1, characterized in that the locking member (204) comprises a second end (204b), said second end (204b) being able to cooperate with a hole or a groove. 4. Rotating electric machine (100) according to claim 3, characterized in that the machine (100) comprises a positioning capsule (211) for positioning the outer ring (20b) relative to the housing (1), the bearing (20 ) being arranged in the capsule (211) and in that the indexing and securing means (218) comprise a second hole (216) arranged in the capsule (211) to cooperate with the second end (204b) of the blocking member (204). 5. Rotating electric machine (100) according to claim 3 or 4, characterized in that the indexing and securing means (218) comprise a second hole arranged in the casing (1) to cooperate with the second end (204b) of the blocking member (204). 6. rotary electric machine (100) according to claim 3 or 4, characterized in that the indexing and securing means (218) comprise a groove (217) arranged in the casing (1) to cooperate with the second end ( 204b) of the locking member (204). 7. rotary electric machine (100) according to claim 3 or 4, characterized in that the housing (1) comprises a molded part and in that the indexing and securing means (218) comprise a second hole arranged in said molded part to cooperate with the second end (204b) of the locking member (204). 8. rotary electrical machine (100) according to one of the preceding claims, characterized in that it comprises a housing (209) mounted on the outer ring of the bearing (20b) and a rotor angular position detector (215), the detector comprises a sensor (212) linked to the outer ring and a target (213) linked to the inner ring (20a), said rotor angular position position detector (215) being arranged in the housing (209). 9. rotary electric machine (100) according to the preceding claim, characterized in that the housing (209) comprises a sleeve (206) accommodating wires for the angular position detector (215), said first hole (214) being arranged in the sleeve (206). 10. Rotating electric machine (100) according to any one of claims 3 to 9, characterized in that the locking member (204) is a pin, a screw or a rivet. 3058 < 1/6