Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
  • H02K7/003—Couplings; Details of shafts
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
  • F16C33/30—Parts of ball or roller bearings
  • F16C33/58—Raceways; Race rings
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
  • F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
  • F16D1/06—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end
  • F16D1/076—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end by clamping together two faces perpendicular to the axis of rotation, e.g. with bolted flanges
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
  • F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
  • F16D1/06—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end
  • F16D1/08—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key
  • F16D1/09—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key with radial clamping due to axial loading of at least one pair of conical surfaces
  • F16D1/092—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key with radial clamping due to axial loading of at least one pair of conical surfaces the pair of conical mating surfaces being provided on the coupled hub and shaft
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
  • H02K7/08—Structural association with bearings
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
  • H02K7/08—Structural association with bearings
  • H02K7/083—Structural association with bearings radially supporting the rotary shaft at both ends of the rotor
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
  • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
  • H02K7/116—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C2380/00—Electrical apparatus
  • F16C2380/26—Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators
  • F16C2380/27—Motor coupled with a gear, e.g. worm gears
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
  • F16C33/30—Parts of ball or roller bearings
  • F16C33/58—Raceways; Race rings
  • F16C33/581—Raceways; Race rings integral with other parts, e.g. with housings or machine elements such as shafts or gear wheels

Definitions

• the present invention relates to electromechanical assemblies comprising an electric machine and a reducer coupled to the machine.
• the invention relates more particularly, but not exclusively, to electromechanical assemblies in which the electric machine is a motor, in particular for an automobile traction application.
• connection between the motor and the gearbox is a source of vibration, which causes noise, which should be reduced to a minimum.
• FR 605 287 discloses an electric motor with a speed governor comprising a pinion interposed between two reported shafts, engaged in tapered bores of the pinion.
• a first solution, illustrated in Figure 1, is not to bring coins, but to have a shaft 1 in which is cut the teeth of pinion 2, also called "pinion tree".
• the material of the tree is generally a steel with high mechanical properties, expensive. Making the gear teeth monolithically with the shaft increases the cost of wear of the machining equipment.
• the front bearing of the engine must provide an oil seal function. Therefore, the engine has a seal 3 which must, to allow the establishment of the shaft, have an inner diameter greater than the outer diameter of the pinion.
• a seal 3 which must, to allow the establishment of the shaft, have an inner diameter greater than the outer diameter of the pinion.
• FIG. 3 Another solution, illustrated in Figure 3, is to use a hollow pinion 2, which is attached to the shaft 1 after mounting the seal 3 and the front bearing 5 of the machine. The torque resistance of the pinion on the shaft is then ensured by axial clamping of a screw 6 fixed at the end of the shaft.
• a disadvantage of such a solution is that the torque resistance of the pinion on the shaft, provided by the tightening of the screw, is relatively limited.
• the invention achieves this objective by virtue of a connection between a shaft of an electric machine, in particular a motor, and a gear of a gearbox coupled to the machine, which is characterized by the fact that the pinion has a conical bore engaged on the shaft and comprises a portion, called tail, engaged in a bearing of the reducer.
• the invention has many advantages.
• the inner diameter of the seal of the machine can be relatively small, which allows operation at high rotational speeds.
• the tapered bore ensures a high torque recovery.
• the tail of the pinion defines the rolling surface for rolling the gearbox.
• the pinion is traversed axially by an axial member useful for attachment to the shaft.
• This axial element is for example a screw fixed at the end of the shaft, or alternatively a threaded part monoblock with the shaft, the fixing then being effected with a nut screwed on it.
• the pinion can be axially constrained on the shaft so as to obtain the desired torque transmission.
• the tail of the pinion can be traversed by a cylindrical bore, in which the aforementioned axial element extends.
• the invention also relates to an electromechanical assembly comprising a machine coupled to a gearbox, the transmission of torque between the gearbox and the machine being effected by means of a connection according to the invention, as defined above.
• the invention also relates to a vehicle equipped with such an electromechanical assembly.
• the invention also relates to a method of mounting a gearbox on an electric machine, to form a connection according to the invention, in which method the pinion is fixed on the shaft of the engine pre-equipped with a bearing and of a joint, then the shaft thus equipped is engaged in the reducer.
• the invention further relates to a method of manufacturing a connection according to the invention, wherein the conical bore and the part engaged in the bearing are machined on the same machine, so as to reduce eccentricity defects.
• FIG. 4 is a partial axial section of an example of an electromechanical assembly according to the invention.
• FIG. 5 represents a detail of FIG. 4.
• FIGS. 5 and 6 show an electromechanical assembly 100 according to the invention, comprising an electric machine 10 coupled to a gearbox 20.
• the electric machine is an electric motor, capable of operating at a high rotational speed, in particular between 10,000 and 18,000 rpm.
• This electric motor is for example a traction motor of an electric or hybrid vehicle, being for example mounted centrally under the hood or directly at the hubs of the wheels.
• the motor 10 comprises a shaft 11 which passes through a front flange 12 carrying a bearing 13 and a seal 14.
• the gearbox 20 comprises a housing 21 which is fixed to a flange 15 of the front flange 12, for example by bolting.
• the housing 21 has an opening 28 in which the shaft 11 is engaged.
• the gearbox 20 houses any reduction or reduction mechanism suitable for the application concerned.
• This mechanism comprises a pinion 30, which is an input gear of the reducer in the example in question, and which meshes with other elements of the mechanism, not visible in FIGS. 5 and 6.
• This pinion 30 has an enlarged portion 31 on which is formed the toothing 32, and a monolithic tail 33 with the enlarged portion 31 defining a rolling surface 34 for a bearing 23 of the gear 20, for example a needle bearing as illustrated.
• the toothing 32 can be of any type, helical, straight or conical.
• the shaft 10 has at the end a conical bearing surface 16 and the enlarged portion 31 of the pinion has a conical bore 35 adapted to fit on the shaft end so as to allow the transmission of the torque between the shaft and the pinion, thanks to the axial clamping of the pinion 30 on the shaft 10 by means of a screw 26 screwed into the shaft and whose head 27 abuts axially on the end edge 37 of the pinion.
• the screw 26 passes through the pinion tail by means of a cylindrical axial bore 38 thereof.
• the end 17 of the shaft 10 does not bear against the shoulder 39 formed at the junction of the tapered bore 35 and the cylindrical bore 38, so as to allow axial clamping of the pinion on the shaft .
• the tapered bore is for example of the MORSE type allowing irreversible drive of the pinion.
• the force applied to the mounting allows the passage of torque, and operation forward or backward does not allow to loosen the pinion.
• the taper is preferably between 5 and 10% (10% corresponds to a 1 ⁇ 2 angle at the top of 2 ° 5 ⁇ 45 "), better still 10%, in order to minimize the axial positioning variation of the pinion 30 with respect to a pinion of an intermediate axis of the gearbox with which it meshes and thus guarantee good meshing conditions, low wear and noise, at the gearbox.
• the shaft 10 can be mounted through the front bearing 13 and the seal 14.
• the pinion 30 can be mounted on the shaft 10 and fixed on it by means of the screw
• the shaft 10 thus provided with its pinion 30 can be engaged in the gearbox 20 through the opening 28 thereof, and the clamping flange 15 of the motor flange assembled to the frame 21 of the gearbox.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Mechanical Engineering (AREA)
• Manufacturing & Machinery (AREA)
• General Details Of Gearings (AREA)
• Gear Transmission (AREA)
• Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
• Mounting Of Bearings Or Others (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=54140536

Family Applications (1)

Country Status (4)

Families Citing this family (2)

Family Cites Families (15)

• 2015
  • 2015-03-30 FR FR1552649A patent/FR3034585B1/fr active Active
• 2016
  • 2016-03-25 EP EP16712855.2A patent/EP3278426A1/de not_active Withdrawn
  • 2016-03-25 WO PCT/EP2016/056729 patent/WO2016156272A1/fr active Application Filing
  • 2016-03-25 CN CN201680020473.5A patent/CN107466340A/zh active Pending

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