Fluid circulation nozzle and rotating electrical machine comprising such a nozzle

Abstract

The invention relates to a fluid circulation nozzle comprising a body (39) defining a conduit (32) for the circulation of the fluid, said conduit (32) having a first outlet (33) configured to supply a fluid reservoir (4), said body having interface zones configured to secure the nozzle (3) to a casing (1) and also to form a support for the reservoir (4).

Description

Description Title of the invention: Fluid circulation nozzle and rotating electrical machine comprising such a nozzle

[0001] The invention relates to a fluid circulation nozzle and a rotating electrical machine comprising such a nozzle. Although more particularly intended for a motor vehicle engine, the invention nevertheless applies in other fields.

[0002] Rotating electrical machines are known comprising a stator, secured to a casing, and a rotor, secured to a shaft. It is also known to equip said machines with speed reducers. Said machines thus comprise numerous moving parts and it is necessary to lubricate them.

[0003] Many solutions are currently in use for this purpose. They provide oil supply circuits between oil storage areas and the machine parts to be lubricated. Although satisfactory in many respects, there is still a need for improvement, particularly in terms of reducing the number of parts required.

[0004] The invention aims to at least partially overcome the above drawbacks and to this end proposes a fluid circulation nozzle comprising a body, defining a conduit for circulation of said fluid, said conduit having a first outlet, configured to supply a reservoir with said fluid, said body having interface zones configured, on the one hand, for fixing the nozzle to a casing and, on the other hand, to form a support for the reservoir.

[0005] Thanks to the invention, the same member, namely the nozzle, makes it possible to both supply and attach a fluid reservoir to a casing, using a body defining a conduit for circulating the fluid towards the reservoir and interface zones for attaching the reservoir to the casing via the nozzle.

[0006] According to various additional characteristics of the invention, which may be taken together or separately and which form as many embodiments of the invention: - said body is configured for fixing a holding member on said nozzle so as to be able to axially hold the reservoir between said holding member and an opposite stop, - said stop is formed by a shoulder of said body, - said conduit further has a second outlet, configured to direct the fluid towards a rotating part housed in said casing, - said second outlet has a calibrated section allowing projection of said fluid at a working pressure, - a first of said interface zones is formed by a first thread provided on the body for fixing the nozzle to the casing by screwing, - said body has a second thread for fixing the holding member to the nozzle by screwing, - a second of said interface zones is formed by a part of the body located between said stop and the second thread for the purpose of supporting the tank, - said conduit extends along a longitudinal axis of said body, - said first and second outlets are located on either side of an inlet of said fluid in said conduit, - said inlet passes radially through said body, - said first outlet is located between said inlet and a first axial end of said body, - said first outlet passes radially through said body, said conduit opens out at the first axial end of said body, - said second outlet is located at a second axial end of said body, - said body comprises a rod axially traversed by a part of said conduit, said rod extending from said stop, a free end of said rod forming the second axial end of said body, - said first thread is located in the vicinity of said inlet, - said second thread is located at said first axial end.

[0007] The invention also relates to a rotating electrical machine, in particular for the motorization of a vehicle, said machine comprising a casing, a reservoir and a nozzle as described above, said nozzle being fixed to said casing and said reservoir being carried by said nozzle.

[0008] According to various additional characteristics of the invention, which may be taken together or separately and which form as many embodiments of the invention: - said casing defines a nozzle fixing housing, said housing extending along said longitudinal axis of the nozzle body, - said housing opens through a partition of the casing, - said nozzle inlet opens into said housing, - said casing comprises a nozzle feed channel, - said channel opens into said housing, said housing has a first zone intended for fixing the nozzle, - said first zone is located in the vicinity of a communication orifice between said channel and said housing, said nozzle passes through an internal volume of said reservoir, said reservoir has a nozzle passage extending along said longitudinal axis of the nozzle body, said passage being closed laterally by a wall and opening axially on either side of said reservoir, said wall of the passage is in continuity of material with a wall of the reservoir, said reservoir and said nozzle mutually define an annular chamber for circulation of the fluid, said chamber communicating on the one hand with the first outlet and on the other hand with an inlet of said reservoir, said reservoir has a pouring spout for the outlet of the fluid, said reservoir has a recess for receiving said holding member, said nozzle passage opens axially into said recess, said holding member is configured to plug said conduit at said first axial end of the nozzle body,said holding member is configured to allow said fluid to circulate in the extension of the conduit so that it can open into a specific volume of said machine, said holding member has a calibrated orifice for distribution of the pressurized fluid at the outlet of said holding member, said holding member comprises a pin for positioning a cover of said machine, said calibrated orifice passes through said pin, said holding member comprises a nut screwed onto said second thread, said machine comprises fluid-tight seals, called inlet seals, located axially on either side of said communication orifice between said channel and said housing, a first of said inlet seals is housed in an annular groove in the body of said nozzle, a second of said inlet seals is housed between said shoulder of the nozzle and a wall of said housing, said machine comprises fluid-tight seals, called outlet seals,located axially on either side of said first nozzle outlet. a first of said outlet seals is located between said nozzle shoulder and the reservoir, a second of said outlet seals is located between said holding member and said reservoir, said machine comprises a specific volume seal, said specific volume seal is located in a groove, provided in the holding organ.

[0009] The invention will be better understood, and other aims, details, characteristics and advantages thereof will appear more clearly during the detailed explanatory description which follows, of at least one embodiment of the invention given by way of purely illustrative and non-limiting example, with reference to the appended schematic drawings among which:

[0010] [Fig.l] partially and schematically illustrates along a longitudinal section plane an exemplary embodiment of a rotating electrical machine according to the invention;

[0011] [Fig.2] schematically illustrates part of [Fig.l];

[0012] [Fig.3] schematically illustrates a first detail of [Fig.2];

[0013] [Fig.4] schematically illustrates a second detail of [Fig.2];

[0014] [Fig.5] schematically illustrates a variant of the detail of the [Fig.4],

[0015] As illustrated in [Fig.l], the invention relates to a rotating electrical machine. This is, for example, a machine for an electrically powered motor vehicle operating, in particular, in traction and / or propulsion. Said machine is intended to be supplied with electric current from an energy storage unit, such as batteries, using a power supply circuit making it possible to convert a direct current generated by said storage unit into an alternating current for supplying the rotating machine.

[0016] Said machine comprises a casing 1 and a shaft 7, mounted in rotation inside the casing 1 around an axis of rotation, referenced X. Said shaft 7 is mounted, for example, via bearings, in particular ball bearings 6 on the casing 1. The rotating electrical machine further comprises at least one rotor 71 integral in rotation with said shaft 7, and at least one stator (not shown) linked to the casing 1. The rotating electrical machine is of axial flux or radial flux, preferably axial flux.

[0017] Said machine advantageously comprises a reducer provided with at least one pinion 8. Said shaft 7 is connected to the reducer by said pinion 8.

[0018] Said rotating electrical machine further comprises a reservoir 4 intended to contain a fluid. Said fluid is in particular a lubricating liquid, in particular oil, intended to facilitate contact without seizure between the moving parts of the rotating electrical machine.

[0019] The casing 1 of the rotating machine comprises, for example, a first part, called the mechanism casing, defining a volume 60 in which the reservoir 4 and / or the reducer are housed, and a second part, called the machine casing, defining a volume 62 in which the rotor and the stator of the electric machine are mounted. The mechanism casing and the machine casing are here attached to one another.

[0020] The housing 1 and the shaft 7 are typically metal parts and may be made of any metal or alloy commonly used to manufacture housings and shafts, such as aluminum.

[0021] As illustrated in [Fig. 2], the invention also relates to a fluid circulation nozzle 3, said nozzle 3 here being an integral part of said rotating machine. In the illustrated embodiment, said nozzle 3 is fixed to said casing 1 and said reservoir 4 is carried by said nozzle 3. Said reservoir 4 is here fixed cantilevered on said casing 1 by means of said nozzle 3.

[0022] Said nozzle comprises a body 39, defining a conduit 32 for circulation of said fluid. Said conduit 32 preferably extends along a longitudinal axis of said body 39. In other words, said body 39 and said conduit 32 have a longitudinal axis, referenced X', here parallel to the axis of rotation X. Said conduit 32 has a first outlet 33, configured to supply the reservoir 4 with said fluid.

[0023] According to the illustrated embodiment, said reservoir 4 has a passage 41 of the nozzle 3 extending along said longitudinal axis X' of the body 39 of the nozzle 3. In other words, said nozzle 3 passes through an internal volume of said reservoir 4. Such a configuration makes it possible to have a reservoir 4 of large volume thanks to a wide radial spread of said reservoir 4 while having a nozzle 3 located at an appropriate level.

[0024] Said passage 41 is closed laterally by a wall 42 having an inlet 34 for said fluid in said reservoir 4. Said passage 41 opens axially on either side of said reservoir 4. As a variant, not shown, the nozzle 3 opens directly into the reservoir 4.

[0025] Said wall 42 of the passage 41 is here in continuity of material with a wall 43 of the reservoir 4. In a variant, not shown, the passage 41 is formed by a tubular insert passing through said reservoir 4.

[0026] Said reservoir 4 and said nozzle 3 mutually define an annular chamber 38 for circulation of the fluid, said chamber 38 communicating on the one hand with the first outlet 33 of the nozzle 3 and on the other hand with the inlet 34 of said reservoir 4, formed in said wall 42 of the passage 4L.

[0027] According to the illustrated embodiment, said reservoir 4 has a pouring spout 44 for the outlet of the fluid.

[0028] Said body 39 of the nozzle 3 has interface zones configured, on the one hand, for fixing the nozzle 3 to the casing 1 and, on the other hand, to form a support for the reservoir 4. The nozzle 3 thus makes it possible not only to supply said reservoir 4 but also to attach the same reservoir 4 to the casing 1. It thus makes it possible to avoid using specific fixing means such as screws or the like to fix the reservoir 4 to the casing 1.

[0029] Said body 39 of the nozzle 3 is advantageously configured for fixing a holding member 5 on said nozzle 3 so as to be able to axially hold the reservoir 4 between said holding member 5 and an opposite stop.

[0030] Said stop is here formed by a shoulder 64 of said body 39 of the nozzle 3. Said shoulder 64 has, for example, the shape of an annular ring made from the material of the body 39. Said ring is centered on said longitudinal axis X'.

[0031] Preferably, said conduit 32 has a second outlet 30, configured to direct the fluid towards a rotating part housed in said casing, here said rotor 71. Said nozzle 3 thus extends partly in the volume 62 defined by the machine casing and partly in the volume 60 defined by the mechanism casing. Said second outlet 30 possibly has a calibrated section allowing projection of said fluid, at a working pressure. The projection of the fluid facilitates good distribution of the fluid over the entire component(s) of the electrical machine to be lubricated, while leaving said second orifice 30 at a distance from said component(s).

[0032] Said first and second outlets 30, 33 are located on either side of an inlet 66 of said fluid in said conduit 32.

[0033] Said first outlet 33 is located, for example, between said inlet 66 and a first axial end 68 of said body 39. By way of example, said first outlet 33 passes radially through said body 39.

[0034] Said conduit 23 opens out at the first axial end 68 of said body 39. That being so, said holding member 5 is configured to at least partially block said conduit 23 at the level of said first axial end 68 of the body 39 of the nozzle 3.

[0035] Said second outlet 30 is advantageously located at a second axial end 70 of said body 39.

[0036] Said body comprises a rod or needle 72, axially traversed by a part of said conduit 23, said rod 72 extending into said machine casing 62, for example from said stop. Said rod or needle 72 is in continuity of material with the rest of said body 39 which extends into the volume 60 of the mechanism casing. A free end of said rod or needle 72 forms the second axial end 70 of said body 39.

[0037] A first of said interface zones of the nozzle 3 is formed by a first thread 78 provided on the body 39 for fixing the nozzle 3 to the casing 1 by screwing. Said body 39 also has a second thread 36 for fixing the holding member 5 to the nozzle 3 by screwing.

[0038] A second of said interface zones is formed by a part of the body 39 located here between said stop and the second thread 36, this for the purpose of supporting the tank 4.

[0039] As illustrated in Figures 3 and 4, said first thread 78 is located in the vicinity of said inlet 66. Said second thread 36 is located at said first axial end 68.

[0040] If we refer more precisely to [Fig. 3], we see that said inlet 66 is here formed of one or more slots 31. By way of example, said slots 31 pass radially through said body 39. Said slots 31 are located axially at the same level along said body 39 and / or are angularly offset around said longitudinal axis X'.

[0041] Said casing 1 defines a housing 37 for fixing the nozzle 3. Said housing 37 extends along said longitudinal axis X' of the body 39 of the nozzle 3. Said housing opens out through a partition 76 of the casing 1. Said partition 76 separates the volume 62 defined by the machine casing from the volume 60 defined by the mechanism casing. Said ball bearing 6 is mounted in said partition 76. Said partition 76 is also crossed by the shaft 7. Said housing 37 allows the nozzle 3 to extend on either side of said partition 76, on the one hand in the volume 62 defined by the machine casing and, on the other hand, in the volume 60 defined by the mechanism casing.

[0042] Said inlet of the nozzle 3, in particular said lights 31, open into said housing 37. The latter defines for this purpose a chamber extending angularly around said longitudinal axis X'.

[0043] Said casing 1 comprises a channel 10 for supplying the nozzle 3. At one of its ends, said channel 10 opens into said housing 37. At the other, said supply channel 10 opens, for example, at the level of a flange, not illustrated, located on the surface of the casing 1 and allowing connection to a reserve and / or to a fluid supply circuit.

[0044] Said housing 37 has a first zone 11 intended for fixing the nozzle. Said first zone 11 is, for example, tapped to cooperate with the first thread 78 of the nozzle 3. Said first zone 11 is located in the vicinity of a communication orifice between said channel 10 and said housing 37.

[0045] Said machine comprises fluid-tight seals 35a, 35b, called inlet seals, located axially on either side of said communication orifice between the channel 10 and said housing 37. A first 35a of said inlet seals is housed in an annular groove of the body 39 of said nozzle 3. A second 35b of said inlet seals is housed between said shoulder 64 of the nozzle 3 and a wall of said housing 1.

[0046] Said machine comprises fluid-tight seals 40a, 40b, called outlet seals, located axially on either side of said first outlet 33 of the nozzle 3. A first 40a of said outlet seals is located between said shoulder 64 of the nozzle 3 and the reservoir 4, here at the level of a free end of a flange 81 made from the material of the wall of the reservoir 4 and axially extending the passage 41 formed in the receptacle 4.

[0047] If we refer more precisely to [Fig.4], we see that said reservoir 4 has a recess 80 to accommodate said holding member 5. Said passage 41 of the nozzle 3 opens axially into said recess 80.

[0048] Said holding member 5 comprises, for example, a nut 82 screwed onto said second thread 36. Said holding member 5 further comprises here a positioning pin 84 for a cover of said machine. Said cover is here a part of the mechanism casing. Said positioning pin 84 axially extends said nut 82 opposite the nozzle 3.

[0049] A second 40b of said outlet seals is located between said holding member 5 and said reservoir 4, possibly at the level of a bottom of the recess 80 receiving the holding member 5, in particular the nut 82. Said bottom here has for this purpose an annular rib for holding said second outlet seal 40b.

[0050] In [Fig. 4], said holding member 5 closes the conduit 32 and said nozzle 3 therefore only comprises two fluid outlets, namely the first outlet 33 and the second outlet 30.

[0051] In [Fig. 5], as a variant, said holding member 5 is configured to allow said fluid to circulate in the extension of the conduit 32 so that it can open into a specific volume of said machine. Said nozzle 3 thus comprises a third fluid outlet. Said holding member 5 here has for this purpose a calibrated orifice 52 for distributing the fluid under pressure at the outlet of said holding member 5. Said calibrated orifice 52 passes through said pin 84.

[0052] In the illustrated embodiment, said machine comprises a seal 51 for sealing the specific volume. Said seal 51 for sealing the specific volume is located, for example, in a groove provided in the holding member 5, in particular at the level of the pin 84.

[0053] If we refer again to [Fig. 2], we see that said fluid circulates in the following manner. It first passes through the supply duct according to the arrow marked 90. After entering the nozzle 3 via the inlet 66, it is distributed in the duct 32 in the direction of the first outlet 33, on the one hand, and the second outlet 30, on the other hand, respectively according to the arrows 92 and 92'. The part of the flow directed towards the first outlet 33 then passes into the receptacle 4 according to the arrow marked 34.

[0054] It should be noted that, according to another aspect of the invention, the nozzle 3 defines said first and second outlets 30, 33 without necessarily having the function of connecting said reservoir 4 to the casing 1. Or again, said nozzle 3 defines said second outlet 30 and serves to connect the reservoir 4 to the casing 1 without necessarily having the first outlet 33.

Claims

Claims

1. Fluid circulation nozzle comprising a body (39), defining a conduit (32) for circulation of said fluid, said conduit (32) having a first outlet (33), configured to supply a reservoir (4) of said fluid, said body having interface zones configured, on the one hand, for fixing the nozzle (3) to a casing (1) and, on the other hand, to form a support for the reservoir (4).

2. Nozzle according to the preceding claim in which said conduit (32) further has a second outlet (30), configured to direct the fluid towards a rotating part housed in said casing (1).

3. Nozzle according to any one of the preceding claims in which said body (39) is configured for fixing a holding member (5) on said nozzle (3) so as to be able to axially hold the reservoir (4) between said holding member (5) and an opposite stop.

4. Nozzle according to the preceding claim in which said stop is formed by a shoulder (64) of said body (39).

5. Rotating electrical machine, in particular for the motorization of a vehicle, said machine comprising a casing (1), a reservoir (4) and a nozzle (3) according to any one of the preceding claims, said nozzle (3) being fixed on said casing (1) and said reservoir (4) being carried by said nozzle (3).

6. Machine according to the preceding claim in which said casing (1) defines a housing (37) for fixing the nozzle (3), said housing (37) extending along a longitudinal axis (X') of the body (39) of the nozzle (3), said housing (37) opening through a partition (76) of the casing (1), an inlet (66) of the nozzle (3) opening into said housing (37).

7. Machine according to the preceding claim in which said casing (1) comprises a channel (10) for supplying the nozzle (3), said channel (10) opening into said housing (37).

8. Machine according to any one of claims 6 or 7 in which said housing (37) has a first zone (11) intended for fixing the nozzle (3).

9. Machine according to any one of claims 5 to 8 wherein said nozzle (3) passes through an internal volume of said reservoir (4).

10. Machine according to any one of claims 5 to 9 wherein said reservoir (4) and said nozzle (3) mutually define an annular chamber (38) for circulation of the fluid, said chamber (38) communicating on the one hand with the first outlet (33) and on the other hand with an inlet (34) of said tank (4).

11. Machine according to any one of claims 5 to 9, claim 5 being taken in its connection with any one of claims 3 or 4, in which said holding member (5) is configured to block said conduit at a first axial end (78) of the body (39) of the nozzle (3).

12. Machine according to any one of claims 5 to 9, claim 5 being taken in its connection with any one of claims 3 or 4, in which said holding member (5) is configured to allow said fluid to circulate in the extension of the conduit (32) so that it can open into a specific volume of said machine.

Images