Rotary electric machine cooled by a heat-transfer fluid

Patent metadata

Field	Value
Publication number	US-10615662-B2
Application number	US-201615764734-A
Country	US
Kind code	B2
Filing date	Sep 26, 2016
Priority date	Sep 30, 2015
Publication date	Apr 7, 2020
Grant date	Apr 7, 2020

Abstract

The invention relates to a rotary electric machine which comprises: a stator provided with a body; a casing in at least two parts; an annular chamber for cooling the machine (30) delimited by an outer wall (23) that belongs to one of the parts of the casing (2, 3) and is made of a moldable material such as aluminium; and an inner wall (31) belonging to a steel part (31) which is thinner than the outer wall (23) and shaped so as to have a region (33) for mounting the stator body and two docking regions (22, 24) each having a seal (36) by virtue of their arrangement on either side of the mounting region (33) of the stator body.

First claim

The invention claimed is:

1. A rotary electric machine comprising:
an outer stator provided with a body bearing a stator winding;
an annular chamber for cooling the machine delimited by an outer wall and an inner wall for receiving heat-transfer fluid; and
a casing comprising at least two parts housing an inner rotor wherein:
the outer wall of the cooling chamber belongs to one of the parts of the casing made of a mouldable material,
the inner wall of the chamber belongs to a part made of steel, which is thinner than the outer wall,
the part is shaped so as to have a region for mounting the body of the stator and two docking regions each having a seal by virtue of their arrangement on either side of the mounting region of the stator body;
one of the docking regions, known as first docking region, has an outer diameter greater than that of the other docking region, known as second docking region,
the outer wall made of the mouldable material, is prolonged internally at one end by a first supporting piece configured to cooperate with the seal of the first docking region and at its other end by a step having a diameter less than the inner diameter of the outer wall, and
the outer wall forms a second supporting piece to cooperate with the seal of the second docking region.

2. The machine according to claim 1 , wherein the outer diameter of the mounting region is less than the outer diameter of the docking regions.

3. The machine according to claim 1 , wherein the axial length of each supporting piece is greater than the axial length of its opposite docking region.

4. The machine according to claim 1 , wherein each docking region has a groove to receive a seal.

5. The machine according to claim 1 , wherein the mounting region has a rib projecting in the direction of the outer wall to form a separator between the heat-transfer fluid inlet and outlet.

6. The machine according to claim 1 , wherein the first docking region is prolonged outside at its loose end by a fastening edge transverse in orientation projecting towards the outside and intended to be attached to a transverse shoulder delimiting the loose end of the first supporting piece of the part concerned of the casing.

7. The machine according to claim 6 , wherein the transverse shoulder belongs to an outer extra piece of material that includes the part concerned of the casing.

8. The machine according to claim 7 , wherein the outer extra piece of material has tapped holes for fixing the fastening edge using fastening elements comprising screws.

9. The machine according to claim 8 , wherein the fastening edge consists of a plurality of legs perforated for attaching to the shoulder using the fastening elements.

10. The machine according to claim 7 , wherein the extra piece of material is inserted between the outer wall and an end area being connected on its inner periphery to the transverse shoulder.

11. The machine according to claim 1 wherein the seals are O rings.

12. The machine according to claim 1 , wherein the casing comprises a front flange and a rear flange and in which the outer wall of the chamber belongs to one of the flanges.

13. The machine according to claim 12 , wherein the chamber belongs to the front flange in the shape of a jar with a peripheral skirt closed by a generally flat lid constituting the rear flange and in which the outer wall belongs to the skirt of the front flange internally tapered in diameter to form the inner periphery of the outer wall and the supporting pieces.

14. The machine according to claim 13 , wherein the rotor is integral with a shaft crossing the front flange having a grooved end for connection to a gearbox intended to power the driving wheels of a thermal engine hybrid vehicle.

Assignees

• Valeo Equip Electr Moteur
• Valeo Equipments Electriques Moteur

Inventors

• Hanquez Michaël
• Gervais Hugues
• Leroy Virginie
• Le Douarin Michel

Classifications

• B60K6/26

  characterised by the motors or the generators · CPC title

• B60Y2400/60

  Electric Machines, e.g. motors or generators · CPC title

• B60Y2200/92

  Hybrid vehicles · CPC title

• Y10S903/906

  Motor or generator · CPC title

• H02K7/006

  Structural association of a motor or generator with the drive train of a motor vehicle · CPC title