WO2018116278A1 - Rotary electric machine - Google Patents

Rotary electric machine Download PDF

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Publication number
WO2018116278A1
WO2018116278A1 PCT/IB2017/058364 IB2017058364W WO2018116278A1 WO 2018116278 A1 WO2018116278 A1 WO 2018116278A1 IB 2017058364 W IB2017058364 W IB 2017058364W WO 2018116278 A1 WO2018116278 A1 WO 2018116278A1
Authority
WO
WIPO (PCT)
Prior art keywords
rear bearing
annular element
machine according
outer ring
contact
Prior art date
Application number
PCT/IB2017/058364
Other languages
French (fr)
Inventor
Pietro De Filippis
Original Assignee
Spal Automotive S.R.L.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Spal Automotive S.R.L. filed Critical Spal Automotive S.R.L.
Publication of WO2018116278A1 publication Critical patent/WO2018116278A1/en

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/173—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings
    • H02K5/1732—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings radially supporting the rotary shaft at both ends of the rotor
    • 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
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F16C35/067—Fixing them in a housing
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2205/00—Specific aspects not provided for in the other groups of this subclass relating to casings, enclosures, supports
    • H02K2205/03—Machines characterised by thrust bearings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/10—Casings or enclosures characterised by the shape, form or construction thereof with arrangements for protection from ingress, e.g. water or fingers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/167—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using sliding-contact or spherical cap bearings
    • H02K5/1672—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using sliding-contact or spherical cap bearings radially supporting the rotary shaft at both ends of the rotor

Definitions

  • This invention relates to a rotary electric machine.
  • the electric machine relevant to this specification is an electric machine of the closed type, called “sealed” in the jargon of the trade.
  • sealed electric machine generally means an electric machine comprising a casing and a cap for closing the casing which defines a container closed in a sealed fashion from which projects the shaft of the rotor.
  • a rotary electric machine of the "sealed" type illustrated by way of example in patent application WO2013/008180 in the name of the same Applicant.
  • the shaft of the rotor is supported by at least one pair of ball bearings, in particular by a rear bearing, positioned in the cap in a respective housing seat, and by a front bearing, positioned in the casing, in the proximity of the outlet of the end of the transmission shaft, in a respective housing seat.
  • sealing element In order to prevent the entry of extraneous agents inside the casing at the outlet of the end of the transmission shaft, use is made of a sealing element. That sealing element also makes contact with the front bearing in order to pre-load it.
  • the sealing element which should prevent the entry of extraneous agents into the casing, is subject to impacts by the front bearing, following an unwanted relative axial movement of the front bearing relative to the casing subjected to the vibrations, which force the sealing element to expand radially, thus incurring a significant wear due to sliding up to the complete disintegration and consequent ejection of the sealing element from the casing.
  • the wear and/or disintegration of the sealing element housed inside the casing at the outlet of the free end of the transmission shaft allows any extraneous agents, such as, for example dust or fluids, to flow inside the casing, irremediably compromising the operation of the rotary electric machine.
  • one aspect of this invention is to provide a rotary electric machine which comprises a casing and a cap for closing the casing defining with it a sealed container comprising a rotor constrained inside it in a rotatable fashion.
  • the rotor comprises a shaft for transmission of the motion, rotating about its own axis of rotation, having a first end rotatably fixed to the cap and a second end which extends outside the casing through a through opening of the casing itself, at least one sealing element is positioned in a respective seat of the casing in communication with the through opening so as to prevent the entry of extraneous agents.
  • At least one rear bearing supports the first end of the transmission shaft during its rotation about its own axis of rotation; it comprises a an inner ring, connected to the transmission shaft, and an outer ring, in contact with the cap in a respective housing seat.
  • Pushing means located between the cap and the rear bearing, are configured to act on the outer ring of the rear bearing in a direction parallel to the axis of rotation R of the transmission shaft.
  • Means for locking the outer ring of the rear bearing are configured to oppose the thrust generated by the pushing means on the outer ring of the rear bearing.
  • the means for locking the rear bearing make it possible to eliminate the relative axial movement of the front bearing relative to the casing, avoiding impacts on the sealing element and the consequent wear.
  • Another advantage that derives from the use of means for locking the rear bearing is due to the possibility of pre-loading the front bearing, and, consequently, the rear bearing, with a minimum force required by the type of bearing used, thus increasing the useful life of the bearing.
  • Figure 1 is a schematic cross section of a first preferred embodiment of a rotary machine according to this invention
  • Figure 2 shows a scaled-up view of a detail from Figure 1 ;
  • Figure 3 is an enlarged perspective view of a detail of the rotary machine according to this invention.
  • Figure 4 is a schematic cross section of a second preferred embodiment of a rotary machine according to this invention.
  • Figure 5 shows a scaled-up view of a detail from Figure 4;
  • Figure 6 is an enlarged perspective view of a detail of the rotary machine of Figure 4.
  • Figure 7 is a schematic cross section of a third embodiment of a rotary machine according to this invention with some parts cut away to better illustrate others;
  • Figure 8 shows a scaled-up view of a detail from Figure 7;
  • Figures 9 and 10 illustrate schematic perspective views of the detail of the third embodiment of a rotary machine of Figure 7.
  • the numeral 1 denotes a rotary electric machine according to this invention.
  • the machine 1 comprises a casing 2 and a cap 3 for closing the casing 2 to form, with the casing 2, a sealed case or closed container 4.
  • the electric machine 1 also comprises a stator 5 fixed to the casing 2 and a rotor 6 inserted in the case 4 and fixed to it in a rotatable fashion about an axis of rotation R.
  • the electrical machine 1 comprises an electronic module or control electronics 7, inserted at least partly in the casing 2.
  • the rotor 6 comprises a motion-transmitting shaft 8 which rotates about the axis of rotation R.
  • the shaft 8 for transmitting the motion has a first end 8a rigidly constrained to the cap 3.
  • the shaft 8 for transmitting the motion has a second end 8b which extends outside the casing 2.
  • the second end 8b of the shaft 8 is designed to rotate a driven part, schematically illustrated by the block 17, about the axis of rotation R.
  • the casing 2 has an through opening 16 through which extends the second end 8b of the transmission shaft 8.
  • At least one rear bearing 9 supports the first end 8a of the transmission shaft 8 during its rotation about its axis R.
  • the rear bearing 9 is preferably a ball bearing 22.
  • the cap 3 has a seat 10 for housing the rear bearing 9.
  • the rear bearing 9 comprises an inner ring 1 1 , connected to the shaft 8, and an outer ring 12, in contact with the cap 3.
  • the inner ring 1 1 of the rear bearing 9 is rigidly constrained to the shaft 8.
  • the balls 22 of the rear bearing 9 are interposed between the inner ring 1 1 and the outer ring 12.
  • the rear bearing 9 has at least one cavity 12a extending along the outer surface of the outer ring 12 facing towards the cap 3.
  • the cavity 12a is the cavity configured to house a respective sealing element, drawn from the rear bearing 9.
  • the outer ring 12, in contact with the cap 3, has a pair of cavities 12a extending along the outer surface of the outer ring 12 facing towards the cap 3.
  • Pushing means 13 of the outer ring 12 of the rear bearing 9 act in a direction parallel to the axis of rotation R of the transmission shaft 8.
  • the pushing means 13 are located between the cap 3 and the rear bearing 9.
  • the cap 3 has a respective surface 14 for contact with the pushing means 13.
  • the contact surface 14 of the pushing means 13 is part of the bottom 15 of the cap 3 designed to define the end of stroke surface of the transmission shaft 8 once the driven part 17 is assembled on the second end 8b of the transmission shaft 8.
  • the pushing means 13 are configured to compensate for any clearance between the rear bearing 9 and the cap 3.
  • the pushing means 13 are in the form of an elastic element, such as, for example, a gasket or sealing element.
  • At least one front bearing 18 supports the shaft 8 close to the through opening 16.
  • the casing 2 has a seat 19 for housing the front bearing 18.
  • the front bearing 18 comprises an inner ring 20, connected to the shaft 8, and an outer ring 21 , in contact with the casing 2. More specifically, the inner ring 20 of the front bearing 18 is rigidly constrained to the shaft 8.
  • the inner ring 20 of the front bearing 18 is keyed to the shaft 8.
  • the front bearing 18 is preferably a ball bearing 34.
  • the balls 34 of the front bearing 18 are interposed between the inner ring 20 and the outer ring 21 .
  • the front bearing 18 has at least one cavity 21 a extending along the outer surface of the outer ring 21 facing towards the casing 2.
  • the cavity 21 a houses a respective sealing element 24.
  • the outer ring 21 in contact with the casing 2, has a pair cavities 21 a, extending along the outer surface of the outer ring 21 facing towards the casing 2, each of which houses a respective sealing element 24.
  • At least one sealing element 23 is positioned in a respective seat 25 of the casing 2 in communication with the through opening 16 of the casing 2.
  • the seat 25 of the casing 2 for housing the sealing element 23 is part of the housing seat 19 of the front bearing 18, since the front bearing 18 and the sealing element 23 of the casing 2 are arranged side by side, along a direction parallel to the axis of rotation R, and, in particular, in mutual contact.
  • the front bearing 18 is positioned towards the inside of the casing 2 and the sealing element 23 of the casing 2 is positioned towards the through opening 16.
  • the machine 1 comprises means 26 for locking the outer ring 12 of the rear bearing 9, configured to oppose the action of the pushing means 13 on the outer ring 12 of the rear bearing 9, along a direction parallel to the axis of rotation R.
  • the cap 3 has a seat 27 for housing and retaining the locking means 26.
  • the housing seat 27 of the locking means 26 is positioned adjacent to the housing seat 10 of the rear bearing 9.
  • the means 26 for locking the outer ring 12 of the rear bearing 9 are positioned adjacent to the rear bearing 9, in a direction parallel to the axis of rotation R.
  • the means 26 for locking the outer the ring 12 of the rear bearing 9 face towards the inside of the casing 2 and the rear bearing 9 faces towards the bottom 15 of the cap 3.
  • the locking means 26 comprise an annular element 28 configured for engaging in the housing seat 27 of the cap 3.
  • the annular element 28 is an open ring, having a first and a second end 28a and 28b which is free and movable relative to each other for allowing the insertion of the annular element 28 in the housing seat 27.
  • the first and the second ends 28a and 28b of the annular element 28 are movable relative to one another towards each other to allow the insertion of the annular element 28 in the seat 27 and, once the annular element 28 is inserted in the seat 27, the first and the second ends 28a and 28b are movable away for occupying the seat 27 and returning to the relative configuration.
  • the annular element 28 is a flexible open ring.
  • the annular element 28 has a band body 29 extending along a direction parallel to the axis of rotation R of the shaft 8.
  • the housing seat 27 is configured to house at least the band body 29.
  • the locking means 26 comprise a plurality of contact elements 30, extending from the annular element 28, configured to lock the forward movement of the outer ring 21 of the rear bearing 9, following the action of the pushing means 13.
  • the contact elements 30 are distributed uniformly along the annular element 28, equidistant from each other.
  • the contact elements 30 are distributed along the annular element 28 in such a way that the resultant of the forces which act on the outer ring 12 of the rear bearing 9 is zero.
  • the contact elements 30 are configured to make contact with the outer ring 12 of the rear bearing 9 at its side face 12b.
  • the contact elements 30 according to the first embodiment are in the form of the flaps.
  • Each contact element 30 is an element at an angle the annular element
  • the inclination of the contact element 30 is less than 45°, in particular 30°.
  • the contact elements 30 extend towards the inside of the annular body 28, that is, towards the transmission shaft 8.
  • the contact elements 30 are movable towards and away from the annular element 28, in particular the band body 29.
  • Each contact element 30 is connected the annular element 28, in particular to the band body 29, by a respective hinge 31 around which the contact element 30 rotates for moving towards and away from the annular element 28.
  • the hinge 31 is positioned along the connecting portion of the contact element 30 to the annular element 28, in particular to the band body 29.
  • the movement towards the annular element 28, in particular towards the band body 29 allows the passage of the rear bearing 9 through the annular element 28 during the assembly of the transmission shaft 8, on which are fixed the rear bearing 9 and the front bearing 18, with the cap 3.
  • the movement away from the annular element 28, in particular the body band 29, allows the locking of the outer ring 12 of the rear bearing 9 using the contact elements 30 once the rear bearing 9 has crossed the annular element 28 during assembly of the transmission shaft 8, on which are fixed the rear bearing 9 and the front bearing 18, with the cap 3.
  • the housing seat 27 of the locking means 26 is made in the housing seat 10 of the rear bearing 9.
  • the contact elements 30 are configured to make contact with the outer ring 12 of the rear bearing 9 in the cavity 12a of the outer surface facing towards the seat 10 of the cap 3 and in this way lock the forward movement of the outer ring 12 of the rear bearing 9 subject to the pushing means 13.
  • the locking means 26 comprise an annular element 28 configured to engage inside the housing seat 27 of the cap 3.
  • the annular element 28 is an open ring, having a first and a second end 28a and 28b which is free and movable relative to each other for allowing the insertion of the annular element 28 in the housing seat 27.
  • the first and the second ends 28a and 28b of the annular element 28 are movable relative to one another towards each other to allow the insertion of the annular element 28 in the seat 27 and, once the annular element 28 is inserted in the seat 27, the first and the second ends 28a and 28b are movable away for occupying the seat 27 and returning to the relative configuration.
  • the annular element 28 is a flexible open ring.
  • the annular element 28 has a band body 29 extending along a direction parallel to the axis of rotation R of the shaft 8.
  • the housing seat 27 is configured to house at least the band body 29.
  • the locking means 26 comprise a plurality of contact elements 30, extending from the annular element 28, configured to insert in the cavity
  • the contact elements 30 are distributed uniformly along the annular element 28, equidistant from each other.
  • the contact elements 30 are distributed along the annular element 28 in such a way that the resultant of the forces which act on the outer ring 12 of the rear bearing 9 is zero.
  • Each contact element 30 is an element at an angle the annular element
  • the inclination of the contact element 30 is less than 45°, in particular 30°.
  • the contact elements 30 extend from the same side edge 35 of the annular element 28, in particular of the band body 29.
  • the contact elements 30 extend towards the inside of the annular body 28, that is, towards the transmission shaft 8.
  • each contact element 30 is connected to the annular element 28, in particular to the band body 29, by means of a respective connecting arm 32.
  • the contact element 30 and the connecting arm 32 define a respective hook-shaped body.
  • the connecting arms 32 extend from the same side edge 35 of the annular element 28, in particular of the band body 29.
  • each contact element 30 is configured in the shape of a "U".
  • the contact elements 30 are movable towards and away from the annular element 28, in particular the band body 29.
  • the connecting arm 32 defines a hinge about which the respective contact element 30 rotates for moving towards and away from the annular element
  • the movement towards the annular element 28, in particular towards the band body 29, allows the passage of the rear bearing 9 through the annular element 28 during the assembly of the transmission shaft 8, on which are fixed the rear bearing 9 and the front bearing 18, with the cap 3.
  • the movement away from the annular element 28, in particular the body band 29, allows the locking of the outer ring 12 of the rear bearing 9 using the contact elements 30 once the rear bearing 9 has crossed the annular element 28 during assembly of the transmission shaft 8, on which are fixed the rear bearing 9 and the front bearing 18, with the cap 3.
  • the locking means 26 comprise an annular element 28 configured to engage inside the housing seat 27 of the cap 3.
  • the annular element 28 is an open ring, having a first and a second end 28a and 28b which is free and movable relative to each other for allowing the insertion of the annular element 28 in the housing seat 27.
  • the first and the second ends 28a and 28b of the annular element 28 are movable relative to one another towards each other to allow the insertion of the annular element 28 in the seat 27 and, once the annular element 28 is inserted in the seat 27, the first and the second ends 28a and 28b are movable away for occupying the seat 27 and returning to the relative configuration.
  • the annular element 28 is a flexible open ring.
  • the annular element 28 has a band body 29 extending along a direction parallel to the axis of rotation R of the shaft 8.
  • the housing seat 27 is configured to house at least the band body 29.
  • the locking means 26 comprise a plurality of contact elements 30, extending from the annular element 28, configured to insert in the cavity 12 of the rear bearing 9, following the action of the pushing means 13.
  • the contact elements 30 are distributed uniformly along the annular element 28, equidistant from each other.
  • the contact elements 30 are distributed along the annular element 28 in such a way that the resultant of the forces which act on the outer ring 12 of the rear bearing 9 is zero.
  • Each contact element 30 is an element at an angle the annular element
  • the inclination of the contact element 30 is less than 45°, in particular 30°.
  • the contact elements 30 extend from the same side edge 35 of the annular element 28, in particular of the band body 29.
  • the contact elements 30 extend towards the inside of the annular body 28, that is, towards the transmission shaft 8.
  • each contact element 30 is connected the annular element 28, in particular to the band body 29, by a respective hinge 31 around which the contact element 30 rotates for moving towards and away from the annular element 28.
  • the hinge 31 is positioned along the connecting portion of the contact element 30 to the annular element 28, in particular to the band body 29.
  • the contact elements 30 are movable towards and away from the annular element 28, in particular the band body 29.
  • the movement towards the annular element 28, in particular towards the band body 29, allows the passage of the rear bearing 9 through the annular element 28 during the assembly of the transmission shaft 8, on which are fixed the rear bearing 9 and the front bearing 18, with the cap 3.
  • the movement away from the annular element 28, in particular the body band 29, allows the locking of the outer ring 12 of the rear bearing 9 using the contact elements 30 once the rear bearing 9 has crossed the annular element 28 during assembly of the transmission shaft 8, on which are fixed the rear bearing 9 and the front bearing 18, with the cap 3.
  • the locking means 26 comprise a plurality of elements 33 for retaining the annular element 28 in the housing seat 27 of the annular element 28.
  • each retaining element 33 extends from the annular element 28, in particular from the band body 29, from the same side edge 35 of the annular element 28, in particular of the band body 29, from which contact elements 30 extend.
  • Each retaining element 33 is in the form of a flap.
  • the retaining elements 33 guarantee that the annular element 28, in particular the band body 29, is kept inside the seat 27 of the cap 3, in particular during assembly of the rear bearing 9 in the respective seat 10, since the rear bearing 9, passing through the locking means 26, subjects the annular element 28 to an axial thrust which is opposed by the action of the retaining elements 33 in the seat 27, avoiding the escape of the annular element 28 from the seat 27.
  • first and a second retaining elements 33a, 33b are preferably associated with a respective contact element 30.
  • the first and second retaining elements 33a, 33b are arranged side by side to the respective contact element 30 in such a way that it is interposed between them.
  • the retaining elements 33 in particular the first and the second retaining element 33a, 33b, may also comprise locking means 26 in the first and second embodiments.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)

Abstract

Described is a rotary electric machine which comprises a casing (2) and a cap (3) for closing the casing (2) forming with it a case (4) closed in a sealed fashion; the closed case (4) comprises a rotor (6), constrained inside it in a rotatable fashion, the shaft (8) of which, for transmission of the motion, rotates about its own axis of rotation (R), having a first end (8a) rotatably fixed to the cap (3) and a second end (8b) which extends outside the casing (2) through a through opening (16) of the casing (2) itself; at least one rear bearing (9) supports the first end (8a) of the transmission shaft (8) during its rotation around its axis (R); pushing means (13), located between the cap (3) and the rear bearing (9), are configured to act on the outer ring (12) of the rear bearing (9) in a direction parallel to the axis of rotation (R) of the transmission shaft (8); means (26) for locking the outer ring (12) of the rear bearing (9) are configured to oppose the thrust generated by the pushing means (13) on the outer ring (12) of the rear bearing (9).

Description

DESCRIPTION
ROTARY ELECTRIC MACHINE
Technical field
This invention relates to a rotary electric machine.
The electric machine relevant to this specification is an electric machine of the closed type, called "sealed" in the jargon of the trade.
Background art
The term sealed electric machine generally means an electric machine comprising a casing and a cap for closing the casing which defines a container closed in a sealed fashion from which projects the shaft of the rotor.
A rotary electric machine of the "sealed" type illustrated by way of example in patent application WO2013/008180 in the name of the same Applicant. In this solution it may be inferred how the shaft of the rotor is supported by at least one pair of ball bearings, in particular by a rear bearing, positioned in the cap in a respective housing seat, and by a front bearing, positioned in the casing, in the proximity of the outlet of the end of the transmission shaft, in a respective housing seat.
In order to prevent the entry of extraneous agents inside the casing at the outlet of the end of the transmission shaft, use is made of a sealing element. That sealing element also makes contact with the front bearing in order to pre-load it.
Following particularly harsh conditions of use of the rotary machine, wherein the machine is subject to continuous outer vibrations during its work cycles, it has been found that the sealing element, which should prevent the entry of extraneous agents into the casing, is subject to impacts by the front bearing, following an unwanted relative axial movement of the front bearing relative to the casing subjected to the vibrations, which force the sealing element to expand radially, thus incurring a significant wear due to sliding up to the complete disintegration and consequent ejection of the sealing element from the casing.
The wear and/or disintegration of the sealing element housed inside the casing at the outlet of the free end of the transmission shaft allows any extraneous agents, such as, for example dust or fluids, to flow inside the casing, irremediably compromising the operation of the rotary electric machine.
This results in the need to overcome this drawback, which is of high significance in sealed type rotary electric machines.
Disclosure of the invention
In this context, one aspect of this invention is to provide a rotary electric machine which comprises a casing and a cap for closing the casing defining with it a sealed container comprising a rotor constrained inside it in a rotatable fashion. The rotor comprises a shaft for transmission of the motion, rotating about its own axis of rotation, having a first end rotatably fixed to the cap and a second end which extends outside the casing through a through opening of the casing itself, at least one sealing element is positioned in a respective seat of the casing in communication with the through opening so as to prevent the entry of extraneous agents.
At least one rear bearing supports the first end of the transmission shaft during its rotation about its own axis of rotation; it comprises a an inner ring, connected to the transmission shaft, and an outer ring, in contact with the cap in a respective housing seat. Pushing means, located between the cap and the rear bearing, are configured to act on the outer ring of the rear bearing in a direction parallel to the axis of rotation R of the transmission shaft.
Means for locking the outer ring of the rear bearing are configured to oppose the thrust generated by the pushing means on the outer ring of the rear bearing. Advantageously, the means for locking the rear bearing make it possible to eliminate the relative axial movement of the front bearing relative to the casing, avoiding impacts on the sealing element and the consequent wear. Another advantage that derives from the use of means for locking the rear bearing is due to the possibility of pre-loading the front bearing, and, consequently, the rear bearing, with a minimum force required by the type of bearing used, thus increasing the useful life of the bearing.
Brief description of drawings
Other features and advantages of the invention are more apparent in the detailed description below, with reference to a non-limiting and nonexclusive preferred embodiment of a rotary electric machine, as illustrated in the accompanying drawings, in which:
Figure 1 is a schematic cross section of a first preferred embodiment of a rotary machine according to this invention;
Figure 2 shows a scaled-up view of a detail from Figure 1 ;
Figure 3 is an enlarged perspective view of a detail of the rotary machine according to this invention;
Figure 4 is a schematic cross section of a second preferred embodiment of a rotary machine according to this invention;
Figure 5 shows a scaled-up view of a detail from Figure 4;
Figure 6 is an enlarged perspective view of a detail of the rotary machine of Figure 4;
Figure 7 is a schematic cross section of a third embodiment of a rotary machine according to this invention with some parts cut away to better illustrate others;
Figure 8 shows a scaled-up view of a detail from Figure 7;
Figures 9 and 10 illustrate schematic perspective views of the detail of the third embodiment of a rotary machine of Figure 7.
Detailed description of preferred embodiments of the invention With reference to the accompanying drawings, the numeral 1 denotes a rotary electric machine according to this invention.
The electrical machine 1 will be described in detail solely for the parts necessary for the understanding of this invention.
The machine 1 comprises a casing 2 and a cap 3 for closing the casing 2 to form, with the casing 2, a sealed case or closed container 4.
The electric machine 1 also comprises a stator 5 fixed to the casing 2 and a rotor 6 inserted in the case 4 and fixed to it in a rotatable fashion about an axis of rotation R.
The electrical machine 1 comprises an electronic module or control electronics 7, inserted at least partly in the casing 2.
The rotor 6 comprises a motion-transmitting shaft 8 which rotates about the axis of rotation R.
The shaft 8 for transmitting the motion has a first end 8a rigidly constrained to the cap 3.
The shaft 8 for transmitting the motion has a second end 8b which extends outside the casing 2.
The second end 8b of the shaft 8 is designed to rotate a driven part, schematically illustrated by the block 17, about the axis of rotation R.
The casing 2 has an through opening 16 through which extends the second end 8b of the transmission shaft 8.
At least one rear bearing 9 supports the first end 8a of the transmission shaft 8 during its rotation about its axis R.
The rear bearing 9 is preferably a ball bearing 22.
The cap 3 has a seat 10 for housing the rear bearing 9.
The rear bearing 9 comprises an inner ring 1 1 , connected to the shaft 8, and an outer ring 12, in contact with the cap 3.
More specifically, the inner ring 1 1 of the rear bearing 9 is rigidly constrained to the shaft 8.
In other words, the inner ring 1 1 of the rear bearing 9 is keyed to the shaft 8.
The balls 22 of the rear bearing 9 are interposed between the inner ring 1 1 and the outer ring 12.
With reference to the second and third embodiments, the rear bearing 9 has at least one cavity 12a extending along the outer surface of the outer ring 12 facing towards the cap 3.
The cavity 12a is the cavity configured to house a respective sealing element, drawn from the rear bearing 9.
In the embodiment illustrated, the outer ring 12, in contact with the cap 3, has a pair of cavities 12a extending along the outer surface of the outer ring 12 facing towards the cap 3.
Pushing means 13 of the outer ring 12 of the rear bearing 9 act in a direction parallel to the axis of rotation R of the transmission shaft 8.
The pushing means 13 are located between the cap 3 and the rear bearing 9.
The cap 3 has a respective surface 14 for contact with the pushing means 13.
The contact surface 14 of the pushing means 13 is part of the bottom 15 of the cap 3 designed to define the end of stroke surface of the transmission shaft 8 once the driven part 17 is assembled on the second end 8b of the transmission shaft 8.
The pushing means 13 are configured to compensate for any clearance between the rear bearing 9 and the cap 3.
Preferably, the pushing means 13 are in the form of an elastic element, such as, for example, a gasket or sealing element.
In order to support the rotation of the shaft 8 in the proximity of the through opening 16, at least one front bearing 18 supports the shaft 8 close to the through opening 16.
The casing 2 has a seat 19 for housing the front bearing 18.
The front bearing 18 comprises an inner ring 20, connected to the shaft 8, and an outer ring 21 , in contact with the casing 2. More specifically, the inner ring 20 of the front bearing 18 is rigidly constrained to the shaft 8.
In other words, the inner ring 20 of the front bearing 18 is keyed to the shaft 8.
The front bearing 18 is preferably a ball bearing 34.
The balls 34 of the front bearing 18 are interposed between the inner ring 20 and the outer ring 21 .
Preferably, the front bearing 18 has at least one cavity 21 a extending along the outer surface of the outer ring 21 facing towards the casing 2. The cavity 21 a houses a respective sealing element 24.
In the embodiment illustrated, the outer ring 21 , in contact with the casing 2, has a pair cavities 21 a, extending along the outer surface of the outer ring 21 facing towards the casing 2, each of which houses a respective sealing element 24.
So as to prevent the entry of extraneous agents in the casing 2, at least one sealing element 23 is positioned in a respective seat 25 of the casing 2 in communication with the through opening 16 of the casing 2.
The seat 25 of the casing 2 for housing the sealing element 23 is part of the housing seat 19 of the front bearing 18, since the front bearing 18 and the sealing element 23 of the casing 2 are arranged side by side, along a direction parallel to the axis of rotation R, and, in particular, in mutual contact.
With reference to the through opening 16, the front bearing 18 is positioned towards the inside of the casing 2 and the sealing element 23 of the casing 2 is positioned towards the through opening 16.
With reference to this invention, the machine 1 comprises means 26 for locking the outer ring 12 of the rear bearing 9, configured to oppose the action of the pushing means 13 on the outer ring 12 of the rear bearing 9, along a direction parallel to the axis of rotation R.
The cap 3 has a seat 27 for housing and retaining the locking means 26.
With reference to the first embodiment of Figures 1 and 2, the housing seat 27 of the locking means 26 is positioned adjacent to the housing seat 10 of the rear bearing 9.
According to this embodiment, the means 26 for locking the outer ring 12 of the rear bearing 9 are positioned adjacent to the rear bearing 9, in a direction parallel to the axis of rotation R.
More specifically, the means 26 for locking the outer the ring 12 of the rear bearing 9 face towards the inside of the casing 2 and the rear bearing 9 faces towards the bottom 15 of the cap 3.
With particular reference to Figure 3, the locking means 26 comprise an annular element 28 configured for engaging in the housing seat 27 of the cap 3.
The annular element 28 is an open ring, having a first and a second end 28a and 28b which is free and movable relative to each other for allowing the insertion of the annular element 28 in the housing seat 27.
The first and the second ends 28a and 28b of the annular element 28 are movable relative to one another towards each other to allow the insertion of the annular element 28 in the seat 27 and, once the annular element 28 is inserted in the seat 27, the first and the second ends 28a and 28b are movable away for occupying the seat 27 and returning to the relative configuration.
In other words, the annular element 28 is a flexible open ring.
The annular element 28 has a band body 29 extending along a direction parallel to the axis of rotation R of the shaft 8.
The housing seat 27 is configured to house at least the band body 29. The locking means 26 comprise a plurality of contact elements 30, extending from the annular element 28, configured to lock the forward movement of the outer ring 21 of the rear bearing 9, following the action of the pushing means 13.
The contact elements 30 are distributed uniformly along the annular element 28, equidistant from each other.
Preferably, the contact elements 30 are distributed along the annular element 28 in such a way that the resultant of the forces which act on the outer ring 12 of the rear bearing 9 is zero.
More specifically, with reference to the first embodiment, the contact elements 30 are configured to make contact with the outer ring 12 of the rear bearing 9 at its side face 12b.
The contact elements 30 according to the first embodiment are in the form of the flaps.
Each contact element 30 is an element at an angle the annular element
28, in particular from the band body 29, in such a way as to extend towards the transmission shaft 8.
Considering as reference the annular body 28, the inclination of the contact element 30 is less than 45°, in particular 30°.
Considering as reference the annular body 28, in particular the band body
29, inserted in the respective seat 27, the contact elements 30 extend towards the inside of the annular body 28, that is, towards the transmission shaft 8.
The contact elements 30 are movable towards and away from the annular element 28, in particular the band body 29.
Each contact element 30 is connected the annular element 28, in particular to the band body 29, by a respective hinge 31 around which the contact element 30 rotates for moving towards and away from the annular element 28.
The hinge 31 is positioned along the connecting portion of the contact element 30 to the annular element 28, in particular to the band body 29. Advantageously, the movement towards the annular element 28, in particular towards the band body 29, allows the passage of the rear bearing 9 through the annular element 28 during the assembly of the transmission shaft 8, on which are fixed the rear bearing 9 and the front bearing 18, with the cap 3.
Advantageously, the movement away from the annular element 28, in particular the body band 29, allows the locking of the outer ring 12 of the rear bearing 9 using the contact elements 30 once the rear bearing 9 has crossed the annular element 28 during assembly of the transmission shaft 8, on which are fixed the rear bearing 9 and the front bearing 18, with the cap 3.
With reference to the second and third embodiment and as illustrated in Figures 4, 5, 7 and 8, the housing seat 27 of the locking means 26 is made in the housing seat 10 of the rear bearing 9.
According to these embodiments, the contact elements 30 are configured to make contact with the outer ring 12 of the rear bearing 9 in the cavity 12a of the outer surface facing towards the seat 10 of the cap 3 and in this way lock the forward movement of the outer ring 12 of the rear bearing 9 subject to the pushing means 13.
With reference to the second embodiment of the machine 1 illustrated in Figures 4 to 6, the locking means 26 comprise an annular element 28 configured to engage inside the housing seat 27 of the cap 3.
The annular element 28 is an open ring, having a first and a second end 28a and 28b which is free and movable relative to each other for allowing the insertion of the annular element 28 in the housing seat 27.
The first and the second ends 28a and 28b of the annular element 28 are movable relative to one another towards each other to allow the insertion of the annular element 28 in the seat 27 and, once the annular element 28 is inserted in the seat 27, the first and the second ends 28a and 28b are movable away for occupying the seat 27 and returning to the relative configuration.
In other words, the annular element 28 is a flexible open ring.
The annular element 28 has a band body 29 extending along a direction parallel to the axis of rotation R of the shaft 8.
The housing seat 27 is configured to house at least the band body 29. The locking means 26 comprise a plurality of contact elements 30, extending from the annular element 28, configured to insert in the cavity
12a of the outer ring 12 and lock the forward movement of the outer ring 12 of the rear bearing 9, following the action of the pushing means 13. The contact elements 30 are distributed uniformly along the annular element 28, equidistant from each other.
Preferably, the contact elements 30 are distributed along the annular element 28 in such a way that the resultant of the forces which act on the outer ring 12 of the rear bearing 9 is zero.
Each contact element 30 is an element at an angle the annular element
28, in particular from the band body 29, in such a way as to extend towards the transmission shaft 8.
Considering as reference the annular body 28, the inclination of the contact element 30 is less than 45°, in particular 30°.
The contact elements 30 extend from the same side edge 35 of the annular element 28, in particular of the band body 29.
Considering as reference the annular body 28, in particular the band body 29, inserted in the respective seat 27, the contact elements 30 extend towards the inside of the annular body 28, that is, towards the transmission shaft 8.
According to the second embodiment, each contact element 30 is connected to the annular element 28, in particular to the band body 29, by means of a respective connecting arm 32.
The contact element 30 and the connecting arm 32 define a respective hook-shaped body.
The connecting arms 32 extend from the same side edge 35 of the annular element 28, in particular of the band body 29.
More specifically, the connecting arm 32 of each contact element 30 is configured in the shape of a "U".
The contact elements 30 are movable towards and away from the annular element 28, in particular the band body 29.
The connecting arm 32 defines a hinge about which the respective contact element 30 rotates for moving towards and away from the annular element
28. Advantageously, the movement towards the annular element 28, in particular towards the band body 29, allows the passage of the rear bearing 9 through the annular element 28 during the assembly of the transmission shaft 8, on which are fixed the rear bearing 9 and the front bearing 18, with the cap 3.
Advantageously, the movement away from the annular element 28, in particular the body band 29, allows the locking of the outer ring 12 of the rear bearing 9 using the contact elements 30 once the rear bearing 9 has crossed the annular element 28 during assembly of the transmission shaft 8, on which are fixed the rear bearing 9 and the front bearing 18, with the cap 3.
With reference to the third embodiment of the machine 1 illustrated in Figures 7 to 10, the locking means 26 comprise an annular element 28 configured to engage inside the housing seat 27 of the cap 3.
With reference to the missing parts of Figure 7 see Figures 1 and 4.
The annular element 28 is an open ring, having a first and a second end 28a and 28b which is free and movable relative to each other for allowing the insertion of the annular element 28 in the housing seat 27.
The first and the second ends 28a and 28b of the annular element 28 are movable relative to one another towards each other to allow the insertion of the annular element 28 in the seat 27 and, once the annular element 28 is inserted in the seat 27, the first and the second ends 28a and 28b are movable away for occupying the seat 27 and returning to the relative configuration.
In other words, the annular element 28 is a flexible open ring.
The annular element 28 has a band body 29 extending along a direction parallel to the axis of rotation R of the shaft 8.
The housing seat 27 is configured to house at least the band body 29. The locking means 26 comprise a plurality of contact elements 30, extending from the annular element 28, configured to insert in the cavity 12 of the rear bearing 9, following the action of the pushing means 13. The contact elements 30 are distributed uniformly along the annular element 28, equidistant from each other.
Preferably, the contact elements 30 are distributed along the annular element 28 in such a way that the resultant of the forces which act on the outer ring 12 of the rear bearing 9 is zero.
Each contact element 30 is an element at an angle the annular element
28, in particular from the band body 29, in such a way as to extend towards the transmission shaft 8.
Considering as reference the annular body 28, the inclination of the contact element 30 is less than 45°, in particular 30°.
The contact elements 30 extend from the same side edge 35 of the annular element 28, in particular of the band body 29.
Considering as reference the annular body 28, in particular the band body 29, inserted in the respective seat 27, the contact elements 30 extend towards the inside of the annular body 28, that is, towards the transmission shaft 8.
According to the third embodiment, each contact element 30 is connected the annular element 28, in particular to the band body 29, by a respective hinge 31 around which the contact element 30 rotates for moving towards and away from the annular element 28.
The hinge 31 is positioned along the connecting portion of the contact element 30 to the annular element 28, in particular to the band body 29. The contact elements 30 are movable towards and away from the annular element 28, in particular the band body 29.
Advantageously, the movement towards the annular element 28, in particular towards the band body 29, allows the passage of the rear bearing 9 through the annular element 28 during the assembly of the transmission shaft 8, on which are fixed the rear bearing 9 and the front bearing 18, with the cap 3.
Advantageously, the movement away from the annular element 28, in particular the body band 29, allows the locking of the outer ring 12 of the rear bearing 9 using the contact elements 30 once the rear bearing 9 has crossed the annular element 28 during assembly of the transmission shaft 8, on which are fixed the rear bearing 9 and the front bearing 18, with the cap 3.
According to the third embodiment, the locking means 26 comprise a plurality of elements 33 for retaining the annular element 28 in the housing seat 27 of the annular element 28.
Preferably each retaining element 33 extends from the annular element 28, in particular from the band body 29, from the same side edge 35 of the annular element 28, in particular of the band body 29, from which contact elements 30 extend.
Each retaining element 33 is in the form of a flap.
Advantageously, the retaining elements 33 guarantee that the annular element 28, in particular the band body 29, is kept inside the seat 27 of the cap 3, in particular during assembly of the rear bearing 9 in the respective seat 10, since the rear bearing 9, passing through the locking means 26, subjects the annular element 28 to an axial thrust which is opposed by the action of the retaining elements 33 in the seat 27, avoiding the escape of the annular element 28 from the seat 27.
In order to guarantee that the annular element 28 is kept inside the seat 27 of the cap 3, first and a second retaining elements 33a, 33b are preferably associated with a respective contact element 30.
The first and second retaining elements 33a, 33b are arranged side by side to the respective contact element 30 in such a way that it is interposed between them.
The retaining elements 33, in particular the first and the second retaining element 33a, 33b, may also comprise locking means 26 in the first and second embodiments.

Claims

1 . A rotary electrical machine comprising:
a casing (2) and a cap (3) for closing the casing (2) forming with it a case (4) closed in a sealed fashion;
the closed casing (4) comprises a rotor (6) constrained inside it in a rotatable fashion;
the rotor (6) comprises a shaft (8) for transmission of the motion, rotating about its own axis of rotation (R), having a first end (8a) rotatably fixed to the cap (3) and a second end (8b) which extends outside the casing (2) through a through opening (16) of the casing (2) itself;
at least one sealing element (23) is positioned in a respective seat (25) of the casing (2) in communication with the through opening (16) so as to prevent entry of extraneous agents;
at least one rear bearing (9) supports the first end (8a) of the transmission shaft (8) during its rotation around its axis (R);
the rear bearing (9) comprising an inner ring (1 1 ), connected to the transmission shaft (8), and a outer ring (12), in contact with the cap (3) in a respective housing seat (10);
pushing means (13), located between the cap (3) and the rear bearing (9), are configured to act on the outer ring (12) of the rear bearing (9) in a direction parallel to the axis of rotation R of the transmission shaft (8); the machine being characterized in that it comprises
means (26) for locking the outer ring (12) of the rear bearing (9) are configured to oppose the thrust generated by the pushing means (13) on the outer ring (12) of the rear bearing (9).
2. The machine according to independent claim 1 , characterised in that the cap (3) has a seat (27) for housing the locking means (26); the locking means (26) comprise an annular element (28) configured for engaging in the housing seat (27).
3. The machine according to claim 2, characterised in that the annular element (28) is an open ring, having a first and a second free end (28a, 28b) movable relative to each other for allowing the insertion of the annular element (28) into its housing (27).
4. The machine according to claim 2 or 3, characterised in that the annular element (28) comprises a band body (29) extending along a direction parallel to the axis of rotation (R) of the transmission shaft (8).
5. The machine according to any one of the preceding claims, characterised in that the locking means (26) comprise a plurality of contact elements (30), extending from the annular element (28), in particular from the band body (29), configured for locking the forward movement of the outer ring (12) of the rear bearing (9) following the action of the pushing means (13).
6. The machine according to claim 5, characterised in that the contact elements (30) extend from the same side edge (35) of the annular element (28), in particular of the band body (29).
7. The machine according to claim 5 or 6, characterised in that the contact elements (30) are distributed equidistant from each other; preferably, the contact elements (30) being distributed along the annular element (28) in such a way that the resultant of the forces which act on the outer ring (12) of the rear bearing (9) is zero.
8. The machine according to any of claims 5 to 7, characterised in that each contact element (30) is an element at an angle the annular element (28), in particular from the band body(29), in such a way as to extend towards the transmission shaft (8).
9. The machine according to any of claims 5 to 8, characterised in that each contact element (30) is mobile towards and away from the annular element (28), in particular the band body (29).
10. The machine according to any of claims 5 to 9, characterised in that each contact element (30) is connected the annular element (28), in particular to the band body (29), by a respective hinge (31 ,32) around which the contact element (30) rotates for moving towards and away from the annular element (28).
1 1 . The machine according to any of claims 5 to 10, characterised in that each contact element (30) is in the form of a flap connected to the annular body (28), in particular to the band body (29), by means of a respective hinge (31 ).
12. The machine according to any of claims 5 to 1 1 , characterised in that the locking means (26) comprise a plurality of elements (33) for retaining the annular element (28) inside the housing seat (27) of the annular element (28); each retaining element (33) extending from the annular element (28), in particular from the band body (29) along a direction parallel to the axis of rotation (R) of the transmission shaft (8).
13. The machine according to claim 12, characterised in that each retaining element (33) extends from the annular element (28), in particular from the band body (29), from the same side edge (35) of the annular element (28), in particular of the band body (29), from which contact elements (30) extend.
14. The machine according to claim 12 or 13, characterised in that it comprises a first and a second retaining element (33a, 33b) arranged side by side to a respective contact element (30) in such a way that it is interposed between them.
15. The machine according to any of claims 5 to 14, characterised in that each contact element (30) is connected to the annular element (28), in particular to the band body (29), by means of a respective connecting arm (32); the contact element (30) and the connecting arm (32) defining a respective single hook-shaped body, in particular the connecting arm (32) of each contact element (30) is configured in the shape of a "U".
16. The machine according to any one of claims 1 to 15, characterised in that the contact elements (30) are configured to make contact with the outer ring (12) of the rear bearing (9) at its side face (12b).
17. The machine according to claim 16, characterised in that the means (26) for locking the outer ring (12) of the rear bearing (9) are positioned adjacent to the rear bearing (9), in a direction parallel to the axis of rotation (R); the means (26) for locking the outer the ring (12) of the rear bearing (9) face towards the inside of the casing (2) and the rear bearing (9) faces towards the bottom (15) of the cap (3).
18. The machine according to any of claims 1 to 15, wherein the contact elements (30) are configured to make contact with the outer ring (12) of the rear bearing (9) in a respective cavity (12a) of the outer surface of the outer ring (12) facing towards the seat (10) of the cap (3) and lock the forward movement of the outer ring (12) of the rear bearing (9) subject to the pushing means (13).
19. The machine according to claim 18, characterised in that the housing seat (27) of the locking means (26) is positioned at the housing seat (10) of the rear bearing (9).
PCT/IB2017/058364 2016-12-22 2017-12-22 Rotary electric machine WO2018116278A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102016000130340A IT201600130340A1 (en) 2016-12-22 2016-12-22 ROTATING ELECTRIC MACHINE.
IT102016000130340 2016-12-22

Publications (1)

Publication Number Publication Date
WO2018116278A1 true WO2018116278A1 (en) 2018-06-28

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Application Number Title Priority Date Filing Date
PCT/IB2017/058364 WO2018116278A1 (en) 2016-12-22 2017-12-22 Rotary electric machine

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Country Link
IT (1) IT201600130340A1 (en)
WO (1) WO2018116278A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0490845A1 (en) * 1990-12-13 1992-06-17 ITT Flygt Aktiebolag Submersible working machine
DE10325522A1 (en) * 2003-05-28 2004-12-16 Robert Bosch Gmbh Generator with bearing part engaged by spring element actuating axial force and supported, with respect to hub, by damping element secured on bearing part
WO2013008180A2 (en) * 2011-07-11 2013-01-17 Spal Automotive S.R.L. Rotating electric machine and related packaging method
EP2594457A2 (en) * 2011-11-16 2013-05-22 Jtekt Corporation Electric power steering system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0490845A1 (en) * 1990-12-13 1992-06-17 ITT Flygt Aktiebolag Submersible working machine
DE10325522A1 (en) * 2003-05-28 2004-12-16 Robert Bosch Gmbh Generator with bearing part engaged by spring element actuating axial force and supported, with respect to hub, by damping element secured on bearing part
WO2013008180A2 (en) * 2011-07-11 2013-01-17 Spal Automotive S.R.L. Rotating electric machine and related packaging method
EP2594457A2 (en) * 2011-11-16 2013-05-22 Jtekt Corporation Electric power steering system

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