WO2021105735A1 - 回転電機 - Google Patents

回転電機 Download PDF

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Publication number
WO2021105735A1
WO2021105735A1 PCT/IB2019/001337 IB2019001337W WO2021105735A1 WO 2021105735 A1 WO2021105735 A1 WO 2021105735A1 IB 2019001337 W IB2019001337 W IB 2019001337W WO 2021105735 A1 WO2021105735 A1 WO 2021105735A1
Authority
WO
WIPO (PCT)
Prior art keywords
bearing
rotor shaft
shaft
rotor
electric machine
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/IB2019/001337
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
卓 桑原
ジャックス デレグ
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Renault SAS
Nissan Motor Co Ltd
Original Assignee
Renault SAS
Nissan Motor Co Ltd
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 Renault SAS, Nissan Motor Co Ltd filed Critical Renault SAS
Priority to JP2021560755A priority Critical patent/JP7447914B2/ja
Priority to EP19954450.3A priority patent/EP4068587B1/en
Priority to PCT/IB2019/001337 priority patent/WO2021105735A1/ja
Publication of WO2021105735A1 publication Critical patent/WO2021105735A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans

Definitions

  • the present invention relates to a rotary electric machine.
  • JP2014-225971A discloses an electric motor including a rotor having a rotor shaft, a stator provided so as to surround the rotor, and a motor housing for accommodating the rotor and the stator.
  • One end of the rotor shaft of the electric motor is connected to the rotating shaft of the transmission.
  • the transmission is configured to reduce the rotational power of the rotor shaft and transmit it to the drive shaft.
  • this electric motor has a configuration in which the rotor shaft is rotatably supported by each of the ball bearing on the one end side and the ball bearing on the other end side arranged apart from each other in the shaft axial direction.
  • ball bearings are arranged on one end side and the other end side of the rotor shaft, which not only complicates the overall configuration of the motor, but also makes the one end side and the other end when the motor is driven. There is a problem that friction loss occurs due to the ball bearing on the side.
  • An object of the present invention is to provide a rotary electric machine capable of ensuring the durability of bearings while suppressing friction loss with a simple configuration.
  • a rotary electric machine having a rotor and a stator in a housing and connecting the rotor shaft of the rotor to the power transmission shaft of the power transmission device.
  • a bearing is provided in the housing, one end of the rotor shaft is supported via the bearing, and the other end of the rotor shaft has an in-row joint structure that fits into the power transmission shaft. It is supported by a power transmission shaft, and an elastic member is provided between the bearing and the rotor shaft.
  • FIG. 1 is a partial vertical sectional view of the motor system of the first embodiment.
  • FIG. 2 is an enlarged view centering on the bearing.
  • FIG. 3 is a partial vertical end view of the motor system of the second embodiment.
  • FIG. 4 is a partial vertical end view of the motor system of the third embodiment.
  • FIG. 5 is a partial vertical end view of the motor system of the fourth embodiment.
  • FIG. 1 is a partial cross-sectional view of the motor system 100 according to the first embodiment of the present invention.
  • FIG. 2 is an enlarged view centering on the bearing 40.
  • the motor system 100 (rotary electric machine system) includes a motor 50 and a transmission 60.
  • the motor system 100 is configured as, for example, a drive device for an electric vehicle.
  • the motor system 100 of the present embodiment will be described as a drive device for an electric vehicle, it may be used as a drive device for a device other than the automobile, for example, various electric devices or industrial machines.
  • the motor 50 rotates by receiving electric power supplied from a power source such as a battery (not shown), and functions as an electric motor for driving the wheels of the vehicle.
  • the motor 50 also functions as a generator that is driven by the rotation of the wheels to generate electricity (regeneration). Therefore, the motor 50 is configured as a so-called motor generator (rotary electric machine) that functions as an electric motor and a generator.
  • the motor 50 includes a rotor 10, a stator 20 arranged so as to surround the rotor 10, and a housing 30 that accommodates the rotor 10 and the stator 20.
  • the rotor 10 includes a cylindrical rotor core 11 formed by laminating a plurality of electromagnetic steel sheets and having a permanent magnet inside, and a rotor shaft 12 fixed in the insertion hole 11A of the rotor core 11.
  • the rotor 10 is rotatably arranged inside the stator 20.
  • the rotor shaft 12 is configured as a shaft member that projects outward in the axial direction from both end faces of the rotor core 11.
  • One end 121 (left end) of the rotor shaft 12 is rotatably supported by a bearing 40 fixed to the housing 30, and the other end 122 (right end) of the rotor shaft 12 is connected to the rotating shaft 61 of the transmission 60.
  • the rotation centers of the rotor shaft 12 and the rotation shaft 61 are located on the same line.
  • the stator 20 is a cylindrical member formed by laminating a plurality of electromagnetic steel sheets, and is configured by winding U-phase, V-phase, and W-phase coils.
  • the outer peripheral surface of the stator 20 is fixed to the inner peripheral surface of the housing 30.
  • the housing 30 is a case member that houses the rotor 10 and the stator 20, and is formed by, for example, casting a metal member.
  • the motor 50 and the transmission 60 are arranged adjacent to each other, and the right side surface of the housing 30 is fixed to the left side surface of the transmission case 62 of the transmission 60 by fastening means such as bolts.
  • a through hole 31 is formed on the right side surface of the housing 30 to allow the other end 122 of the rotor shaft 12 to pass outside the housing 30.
  • the transmission 60 includes a rotating shaft 61 and a plurality of gears (not shown) in the transmission case 62, and is configured as a power transmission device that shifts the rotational power of the rotor shaft 12 and transmits it to the wheels.
  • the rotating shaft 61 is rotatably supported by a ball bearing 63 provided in the transmission case 62.
  • a through hole 64 is formed on the left side surface of the transmission case 62 to allow the left end portion (tip portion) of the rotating shaft 61 to pass outside the transmission case 62.
  • the through hole 64 of the transmission case 62 is arranged so as to communicate with the through hole 31 of the housing 30.
  • the rotor shaft 12 of the motor 50 has a central portion 123 fixed to the insertion hole 11A of the rotor core 11 and one end portion 121 extending from the central portion 123 to the side opposite to the transmission 60 side. And the other end 122 extending from the central 123 to the transmission 60 side.
  • the outer diameters of the one end 121 and the other end 122 are formed to be smaller than the outer diameter of the central 123, and the one end 121 and the other end 122 are shaft members thinner than the central 123.
  • the other end 122 of the rotor shaft 12 is configured as a shaft member whose diameter gradually decreases toward the tip.
  • the rotating shaft 61 of the transmission 60 has a shaft hole 61A formed at the left end portion so as to be recessed in the axial direction.
  • the tip of the other end 122 of the rotor shaft 12 is inserted into the shaft hole 61A (inrow hole) formed at the end of the rotating shaft 61, and the outer peripheral surface of the other end 122 is relative to the inner peripheral surface of the shaft hole 61A.
  • the other end 122 of the rotor shaft 12 is connected to the rotating shaft 61 by an in-row joint structure that fits into the rotating shaft 61 of the transmission 60.
  • the shaft hole 61A of the rotating shaft 61 is linearly formed at a portion constituting the left end portion of the rotating shaft 61, but is closer to the right end portion than the central portion 123 or the central portion 123 of the rotating shaft 61 from the left tip surface. It may be formed linearly up to the position of. Therefore, the other end 122 of the rotor shaft 12 may be configured to be in-row connected to the shaft hole 61A of the rotating shaft 61 at a position closer to the right end than the central portion 123 or the central portion 123 of the rotating shaft 61. ..
  • the other end 122 of the rotor shaft 12 has an inner peripheral surface of the shaft hole 61A on an outer peripheral surface at a position closer to the central portion 123 than the tip, that is, a position different from a portion (inrow connection portion) that fits the rotating shaft 61.
  • a spline portion 122A is provided for spline coupling with respect to the spline.
  • the spline portion 122A is provided at a position closer to the tip of the other end portion 122, and the portion (inrow connection portion) to be fitted to the rotating shaft 61 is provided at a position closer to the central portion 123 than the spline portion 122A. You may.
  • the regulation of the relative rotation between the rotor shaft 12 and the rotating shaft 61 is realized by the spline joint structure, but it may be realized by the joint structure other than the spline joint structure.
  • the joint structure other than the spline joint structure include a flange joint structure, an oldham joint structure, and a rotex joint structure.
  • a cylindrical bearing support portion 32 that supports the bearing 40 is projected on the inside of the left side surface of the housing 30, and one end portion 121 of the rotor shaft 12 is formed by a bearing 40 fixed to the inner peripheral surface of the bearing support portion 32. It is rotatably supported. As described above, when the motor 50 alone is viewed, only one end portion 121 of the rotor shaft 12 of the rotor 10 is supported by the bearing 40.
  • the bearing 40 is configured as a double row angular contact ball bearing.
  • the bearing 40 that supports one end 121 of the rotor shaft 12 is configured as a double-row angular ball bearing, even when an axial force acts on the rotor shaft 12, the double-row angular ball bearing exerts the force. It becomes possible to rotate while receiving. Thereby, the rotor shaft 12 can be supported more stably.
  • the rotor shaft 12 Before assembling the motor 50 and the speed change shore 60, the rotor shaft 12 is cantilevered with respect to the housing 30 via the bearing 40. If one end 121 of the rotor shaft 12 is not firmly supported by the bearing 40, the other end 122 side of the rotor shaft 12 may swing and the rotor core 11 attached to the rotor shaft 12 may interfere with the stator 20. There is.
  • the bearing 40 is configured as a double row angular contact ball bearing, the other end portion 122 of the rotor shaft 12 can be firmly supported without swinging. Therefore, it is possible to suppress the interference between the rotor core 11 and the stator 20 in the state before the rotor shaft 12 is connected to the rotating shaft 61 of the transmission 60.
  • the bearing 40 is provided with two rows of rolling elements 43a and 43b in the axial direction of the shaft between the inner ring 41 and the outer ring 42, and connects the contact points of the inner ring 41, the rolling elements 43a and 43b, and the outer ring 42 in each row.
  • the straight line (lines A and B) has an inclination with respect to the shaft radial direction.
  • the line A in the outer row is inclined toward the other end 122 side from the inner ring 41 toward the outer ring 42
  • the line B in the inner row is inclined toward one end 121 side toward the outer ring 42 from the inner ring 41.
  • the inner ring 41 of the bearing 40 is fixed to the outer peripheral surface of one end 121 of the rotor shaft 12.
  • the outer ring 42 of the bearing 40 is fixed to the inner peripheral surface of the bearing support portion 32.
  • step portion 124 The diameter of one end 121 of the rotor shaft 12 is changed so as to be reduced in a step shape, and this step step portion is referred to as a "step portion 124".
  • the position of the bearing 40 in the axial direction is fixed by the step portion 124.
  • first wall-shaped member 201 is mounted between the right end of the bearing 40 (hereinafter referred to as "first end 401") and the step portion 124.
  • the first wall-shaped member 201 has an annular shape, is fitted to the rotor shaft 12, and is fixed by abutting against the step portion 124.
  • the first wall-shaped member 201 has a wave spring shape, and is configured as a spring member that exerts an urging force by being compressed in the plate pressure direction.
  • a second wall-shaped member 202 is mounted on the side opposite to the first end 401 of the bearing 40, that is, on the left end (hereinafter referred to as "second end 402").
  • the second wall-shaped member 202 has an annular shape and is fitted in the rotor shaft 12, and further, by fitting the snap ring 204 in the groove 126 formed in the rotor shaft 12, it does not move in the axial direction. Fixed as possible.
  • the second wall-shaped member 202 may be fixed to one end 121 of the rotor shaft 12 by friction fitting such as press fitting, or may be fixed by screwing or the like instead of the snap ring 204.
  • the inner ring 41 of the bearing 40 is the first wall-shaped member 201 which is a spring member. Is urged in the axial direction and pressed toward the second wall-shaped member 202. As a result, the bearing 40 is sandwiched between the first wall-shaped member 201 and the second wall-shaped member 202, and its position is firmly fixed.
  • Two O-rings 203a and 203b are interposed between the inner ring 41 of the bearing 40 and one end 121 of the rotor shaft 12.
  • two grooves 125a and 125b are formed in a circumferential shape on the outer periphery of one end portion 121 in parallel in the axial direction.
  • O-rings 203a and 203b are fitted in parallel to the grooves 125a and 125b, respectively.
  • the O-rings 203a and 203b are formed in an annular shape and a substantially circular cross section by an elastic member such as rubber, and the diameter of the cross section is formed to be larger than the depth of the grooves 125a and 125b.
  • the portion of the O-rings 203a and 203b is larger than the diameter of the outer circumference of the one end portion 121.
  • the inner diameter of the inner ring 41 of the bearing 40 is formed to be slightly larger than the diameter of the outer circumference of one end 121.
  • grease which is a viscous fluid
  • the structure in which the bearing 40 is attached to the rotor shaft 12 via the O-rings 203a and 203b buffers the transmission of the vibration of the rotor shaft 12 to the bearing 40. Further, since grease is filled between the bearing 40 and the rotor shaft 12 to prevent contact between the inner circumference of the inner ring 41 of the bearing 40 and the outer circumference of one end 121 of the rotor shaft 12, these wears are prevented. Be prevented.
  • the bearing 40 is supported by two O-rings 203a and 203b, but the bearing 40 is not limited to this.
  • a flat belt-shaped elastic member may be interposed between the bearing 40 and the one end 121 without providing a groove in the one end 121.
  • the O-rings 203a and 203b may be made of elastic members such as silicon and elastomer instead of rubber.
  • first wall-shaped member 201 may be composed of another spring such as a disc spring instead of the wave spring. Further, the first wall-shaped member 201 may be made of an elastic material such as rubber. Further, the second wall-shaped member 202 may be composed of a spring member instead of the first wall-shaped member 201, and both the first wall-shaped member 201 and the second wall-shaped member 202 may be formed. It may be a spring member. In this embodiment, considering the prevention of grease scattering, it is preferable that only the first wall-shaped member 201 that abuts on the step portion 124 is a spring member.
  • the O-rings 203a and 203b are fitted into the grooves 125a and 125b of one end 121 of the rotor shaft 12, respectively.
  • the first wall-shaped member 201 is axially passed through the open end of one end 121 of the rotor shaft 12. The first wall-shaped member 201 is moved until it hits the step portion 124.
  • the bearing 40 is axially passed through the rotor shaft 12 from the open end of one end 121 of the rotor shaft 12.
  • the bearing 40 is moved to a position where it abuts on the first wall-shaped member 201.
  • the second wall-shaped member 202 is axially passed through the rotor shaft 12 from the open end of one end 121 of the rotor shaft 12 and moved to a position where it abuts on the second end 402 of the bearing 40.
  • the snap ring 204 is fitted into the groove 126.
  • the bearing 40 is attached to one end 121 of the rotor shaft 12.
  • the outer ring 42 of the bearing 40 is fixed to the bearing support portion 32 of the housing 30 by press fitting or the like.
  • the bearing 40 is fixed to the housing 30 and the rotor shaft 12 is supported.
  • the motor 50 includes the rotor 10 and the stator 20 in the housing 30, and the rotor shaft 12 of the rotor 10 is connected to the rotating shaft 61 (power transmission shaft) of the transmission 60 (power transmission device).
  • a bearing 40 is provided in the housing 30, one end 121 of the rotor shaft 12 is supported via the bearing 40, and the other end 122 of the rotor shaft 12 is an in-row joint that fits into the rotating shaft 61. It is supported by the rotating shaft 61 due to its structure.
  • O-rings 203a and 203b are provided between the bearing 40 and the rotor shaft 12.
  • the other end 122 of the rotor shaft 12 is connected in-row to the rotating shaft 61 of the transmission 60, so that a bearing for supporting the other end 122 of the rotor shaft 12 needs to be provided in the housing 30. Absent.
  • the rotor shaft 12 can be rotatably supported at both ends by the bearing 40 for one end 121 provided in the housing 30 and the rotating shaft 61 of the transmission 60, so that the other end of the rotor shaft 12 can be supported. It is possible to omit the bearing for the portion 122. As a result, the overall configuration of the motor 50 can be simplified. Further, since the bearing is not arranged at the other end 122, the frictional resistance during rotation of the rotor shaft 12 can be reduced, and the manufacturing cost of the motor 50 can also be reduced.
  • the O-rings 203a and 203b elastic members
  • the vibration of the rotor shaft 12 due to the in-row joint structure on the other end 122 side is transmitted to the bearing 40. This is buffered, wear and damage of the bearing 40 and the rotor shaft 12 can be prevented, and the durability of the bearing 40 can be ensured.
  • the elastic members are the O-rings 203a and 203b fixed to the rotor shaft 12, the bearing 40 and the rotor shaft 12 can be prevented from being worn or damaged by a simple and inexpensive configuration.
  • the two O-rings 203a and 203b are provided in parallel in the axial direction between the bearing 40 and the rotor shaft 12, so that the bearing 40 and the rotor shaft 12 are less likely to be worn or damaged. It can be reliably prevented.
  • the gap formed between the bearing 40 and the rotor shaft 12 by the O-rings 203a and 203b is filled with grease as a viscous fluid, the inner ring 41 of the bearing 40 Contact between the inner circumference and the outer circumference of one end 121 of the rotor shaft 12 can be prevented, and these wears are further prevented.
  • the bearing 40 is a double-row angular ball bearing, even when an axial force acts on the rotor shaft 12, the force is received by the double-row angular ball bearing. Is possible. Thereby, the rotor shaft 12 can be supported more stably.
  • the rotor shaft 12 has wall-shaped members (first wall-shaped member 201 and second wall-shaped member 201 and second wall-shaped members) that regulate the axial movement of the bearing 40 at both ends of the bearing 40. Since the member 202) is provided, the position of the bearing 40 on the rotor shaft 12 is fixed between the first wall-shaped member 201 and the second wall-shaped member 202.
  • At least one of the wall-shaped members (first wall-shaped member 201 and second wall-shaped member 202) (first wall-shaped member 201) has the bearing 40 axially oriented. Since it is configured as an urging spring member, the bearing 40 is urged by the first wall-shaped member 201, which is a spring member, and pressed toward the second wall-shaped member 202. As a result, the position of the bearing 40 on the rotor shaft 12 is firmly fixed between the first wall-shaped member 201 and the second wall-shaped member 202. Further, by sandwiching the bearing 40 between the first wall-shaped member 201 and the second wall-shaped member 202, it is possible to prevent the grease filled between the bearing 40 and the rotor shaft 12 from scattering to the outside. Grease.
  • the motor 50 includes a bearing 140 composed of a single row single row ball bearing (deep groove ball bearing) instead of the bearing 40 composed of the double row angular contact ball bearing. Since other configurations are the same as those of the first embodiment described above, the description thereof will be omitted.
  • single-row ball bearings are simple in construction, inexpensive, and mainly. It is characterized by receiving a load in the radial direction.
  • the bearing 140 which is a single-row ball bearing, can be adopted in consideration of the load between the motor 50 and the transmission 60, the configuration of the in-row joint, and the like. As a result, the manufacturing cost and maintenance cost of the motor system 100 can be suppressed.
  • a motor system 100 including the motor 50 and the transmission 60 according to the third embodiment of the present embodiment will be described.
  • the motor 50 of the third embodiment and the motor 50 of the first embodiment are different in the way of in-row connection between the other end 122 of the rotor shaft 12 and the rotating shaft 61 of the transmission 60.
  • a shaft hole 122B (inrow hole) recessed in the axial direction is formed at the tip of the other end 122 of the rotor shaft 12.
  • the left end portion of the rotating shaft 61 of the transmission 60 is configured as a shaft member whose diameter gradually decreases toward the tip end.
  • the left end (tip portion) of the rotating shaft 61 of the transmission 60 is inserted into the shaft hole 122B, and the inner peripheral surface of the shaft hole 122B located near the tip surface of the other end 122 is on the outer peripheral surface of the end of the rotating shaft 61. Fit against. Since other configurations are the same as those of the first embodiment described above, the description thereof will be omitted.
  • the shaft hole 122B formed in the other end 122 of the rotor shaft 12 is located on the inner peripheral surface at a position closer to the central portion 123 than the tip, that is, at a position different from the portion (inrow connection portion) fitted to the rotating shaft 61.
  • a spline portion 122C is provided which is spline-coupled to the outer peripheral surface of the rotating shaft 61.
  • the spline portion 122C is provided at a position closer to the tip of the other end portion 122, and the portion (inrow connection portion) to be fitted to the rotating shaft 61 is provided at a position closer to the central portion 123 than the spline portion 122C. You may.
  • the other end 122 of the rotor shaft 12 is connected to the rotating shaft 61 by an in-row joint structure that fits into the rotating shaft 61 of the transmission 60.
  • the shaft hole 122B of the rotor shaft 12 is linearly formed at a portion constituting the other end portion 122, but is closer to one end portion 121 than the central portion 123 or the central portion 123 of the rotor shaft 12 from the right end surface. It may be formed linearly up to the position of. Therefore, the rotor shaft 12 may be configured to be in-row connected to the rotating shaft 61 of the transmission 60 at a position closer to the one end portion 121 than the central portion 123 or the central portion 123.
  • the regulation of the relative rotation between the rotor shaft 12 and the rotating shaft 61 may be realized by a joint structure other than the spline joint structure.
  • the joint structure other than the spline joint structure include a flange joint structure, an oldham joint structure, and a rotex joint structure.
  • the motor 50 configured in this way supports the other end 122 of the rotor shaft 12 by connecting the other end 122 of the rotor shaft 12 to the rotating shaft 61 of the transmission 60 in-row. It is not necessary to provide the bearing of the above in the housing 30, and it is possible to obtain the same operation and effect as in the first embodiment.
  • the shaft thickness of the rotor shaft 12 can be made thicker than that of the rotating shaft 61.
  • the motor 50 of the present embodiment has a configuration in which the shaft hole 122B of the other end 122 of the rotor shaft 12 is externally fitted to the end of the rotating shaft 61, the motor 50 is not limited to the shaft thickness of the rotating shaft 61.
  • the end 122 can be formed to any thickness. As a result, the connection strength between the other end 122 of the rotor shaft 12 and the rotating shaft 61 of the transmission 60 can be increased as needed.
  • the other end portion 122 can be easily formed to have an arbitrary thickness within a range in which the outer diameter is not larger than that of the central portion 123.
  • the other end 122 and the center 123 of the rotor shaft 12 have the same outer diameter, only one end 121 needs to be formed to have a smaller diameter than the other parts, which reduces the manufacturing cost of the rotor shaft 12. be able to.
  • the connection strength when only the end portion of the rotating shaft 61 is formed thick as in the first embodiment on the rotating shaft 61 having a substantially constant outer diameter, the manufacturing cost increases. Therefore, according to the rotor shaft 12 according to the present embodiment, it is possible to increase the connection strength between the rotor shaft 12 and the rotating shaft 61 without increasing the manufacturing cost.
  • the shaft hole 122B of the other end 122 of the rotor shaft 12 is placed on the inner peripheral surface at a position different from the portion fitted to the rotating shaft 61, with respect to the outer peripheral surface of the rotating shaft 61.
  • a spline portion 122C for spline coupling is provided.
  • the other end 122 of the rotor shaft 12 is formed with a portion that is in-row connected to the rotating shaft 61 and a portion that is spline-coupled to the rotating shaft 61. Therefore, the connection range of the rotor shaft 12 with respect to the rotating shaft 61 is widened, and the other end 122 of the rotor shaft 12 can be supported more stably.
  • the portion fitted to the rotating shaft 61 is provided at a position closer to the rotating shaft 61 than the spline portion 122C, for example, in the shaft hole 122B at the tip portion of the other end 122.
  • the portion supported by the bearing 40 and the portion supported by the rotating shaft 61 can be arranged as far apart as possible.
  • the rotor shaft 12 can be supported at both ends in a state where the inclination of the rotor shaft 12 is further suppressed, and the rotor shaft 12 can be stably supported.
  • the rotor 10 of the motor 50 includes a rotor core 11, a rotor shaft 12, a core support portion 13, and a connecting portion 14. Since other configurations are the same as those of the first embodiment described above, the description thereof will be omitted.
  • the core support portion 13 of the rotor 10 has a cylindrical shape and is a member that supports the cylindrical rotor core 11 from the inside.
  • the core support portion 13 is formed so that its axial length is slightly longer than the axial length of the rotor core 11.
  • the core support portion 13 is inserted into the insertion hole 11A of the rotor core 11, and the rotor core 11 is fixed on the core support portion 13 in a state of being externally fitted to the outer circumference of the core support portion 13.
  • the rotor shaft 12 is arranged inside the core support portion 13.
  • the rotor shaft 12 and the core support portion 13 are connected via a connecting portion 14.
  • the connecting portion 14 is formed as a disk-shaped wall portion protruding in the shaft radial direction from the outer peripheral surface of the central portion 123 of the rotor shaft 12, and is inside the outer peripheral surface of the central portion 123 of the rotor shaft 12 and the core support portion 13. Connect to the peripheral surface.
  • the plate thickness of the connecting portion 14 is set thinner than the axial length of the rotor shaft 12 and the core supporting portion 13.
  • one end 121 is supported by the bearing 40, and the other end 122 is circumscribed to the rotating shaft 61 in a state where the other end 122 is circumscribed to the end of the rotating shaft 61 of the transmission 60.
  • in-row joint structure in which the tip portion of the rotating shaft 61 is inserted into the shaft hole 122B of the other end portion 122 of the rotor shaft 12.
  • it may have an in-row joint structure in which the tip end portion of the other end 122 of the rotor shaft 12 is inserted into the shaft hole 61A of the rotating shaft 61 as in the first embodiment shown in FIG. ..
  • the housing 30 is formed by the left side housing 30L and the right side housing 30R, and the central portion 33 of the left side housing 30L is recessed in the shaft axial direction so as to enter the inside of the core support portion 13. Will be done.
  • a bearing support portion 32 is formed in the central portion 33 of the left housing 30L, and the bearing 40 is fixed to the bearing support portion 32. That is, the bearing 40 is provided and fixed at the central portion 33 of the left housing 30L so as to be located inside the rotor core 11 and the core support portion 13.
  • the bearing 40 is configured as a double row angular contact ball bearing.
  • the fixing of one end 121 of the rotor shaft 12 and the bearing 40 is the same as in the first embodiment described above. That is, on the first end 401 side of the bearing 40, the first spring member is formed on the step portion 124 formed near the boundary between the connection portion 14 connecting the rotor shaft 12 and the core support portion 13 and the one end portion 121.
  • the wall-shaped member 201 is fixed, and the second end portion 402 of the bearing 40 is fixed by the second wall-shaped member.
  • O-rings 203a and 203b are interposed between the inner peripheral side of the inner ring 41 of the bearing 40 and the outer peripheral side of one end 121 of the rotor shaft 12, and grease is filled.
  • the connecting portion 14 extends vertically from the one end portion 121 instead of pressing the first wall-shaped member 201 against the stepped portion 124 formed near the boundary between the connecting portion 14 and the one end portion 121 to fix the first wall-shaped member 201.
  • the shape may be such that the first wall-shaped member 201 is pressed against the connecting portion 14.
  • the rotor 10 has a core support portion 13 that supports the rotor core 11 from the inside and a disk-shaped member that projects from the outer peripheral surface of the rotor shaft 12 in the shaft radial direction. It is provided with a connecting portion 14 for connecting the outer peripheral surface of the rotor shaft 12 and the inner peripheral surface of the core support portion 13.
  • the left housing 30L constituting the housing 30 is formed so that the central portion 33 (part) enters the inside of the core support portion 13.
  • a first wall-shaped member 201 which is a spring member that urges the bearing 40 in the axial direction, is provided between the connection portion 14 and the first end portion 401 (one end side) of the bearing 40, and the second of the bearing 40 is provided.
  • the end portion 402 (the other end side) is provided with a second wall-shaped member 202 that regulates the axial movement of the bearing.
  • the width of the motor 50 itself in the axial direction is changed to another. It can be made thinner than the motor 50 of the form. This makes it possible to make the motor 50 compact. Further, since the bearing 40 is fixed so as to abut against the connecting portion 14, it is possible to prevent the grease from scattering.
  • the rotor core 11, the stator 20, the core support portion 13, and the like described in each of the above-described embodiments are cylindrical members, but may be polygonal tubular members.
  • the motor 50 is assembled to the transmission 60 as a power transmission device, but the motor 50 may be assembled to a power transmission device such as a speed reducer. Even in this case, the rotor shaft 12 of the motor 50 and the rotating shaft of the speed reducer can be connected by applying the technical idea in each embodiment.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Frames (AREA)
  • Support Of The Bearing (AREA)
  • Mounting Of Bearings Or Others (AREA)
  • Rolling Contact Bearings (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
PCT/IB2019/001337 2019-11-26 2019-11-26 回転電機 Ceased WO2021105735A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2021560755A JP7447914B2 (ja) 2019-11-26 2019-11-26 電動車両の駆動装置
EP19954450.3A EP4068587B1 (en) 2019-11-26 2019-11-26 Rotary electric machine
PCT/IB2019/001337 WO2021105735A1 (ja) 2019-11-26 2019-11-26 回転電機

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2019/001337 WO2021105735A1 (ja) 2019-11-26 2019-11-26 回転電機

Publications (1)

Publication Number Publication Date
WO2021105735A1 true WO2021105735A1 (ja) 2021-06-03

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PCT/IB2019/001337 Ceased WO2021105735A1 (ja) 2019-11-26 2019-11-26 回転電機

Country Status (3)

Country Link
EP (1) EP4068587B1 (https=)
JP (1) JP7447914B2 (https=)
WO (1) WO2021105735A1 (https=)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
JP2023019591A (ja) * 2021-07-29 2023-02-09 株式会社アイシン 駆動装置

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JP2000356256A (ja) * 1999-06-16 2000-12-26 Fuji Electric Co Ltd トルク検出装置
JP2002136007A (ja) * 2000-10-20 2002-05-10 Fujitsu General Ltd 電動機の回転子およびその製造方法
JP2002233112A (ja) * 2001-02-05 2002-08-16 Showa Corp 電動パワーステアリング装置
JP2003237599A (ja) * 2002-02-18 2003-08-27 Koyo Seiko Co Ltd 電動パワーステアリング装置
JP2007247711A (ja) * 2006-03-14 2007-09-27 Nsk Ltd 水中回転装置用転がり軸受
JP2010154751A (ja) * 2010-03-30 2010-07-08 Shingo Sekiguchi 誘導型電動機の構造
JP2014225971A (ja) 2013-05-16 2014-12-04 本田技研工業株式会社 電動機
JP2017093076A (ja) * 2015-11-05 2017-05-25 日産自動車株式会社 回転電機

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DE4139984A1 (de) * 1991-12-04 1993-06-09 Robert Bosch Gmbh, 7000 Stuttgart, De Motor
JP2005096622A (ja) * 2003-09-25 2005-04-14 Toyoda Mach Works Ltd 電気式動力舵取装置
JP2010112490A (ja) * 2008-11-07 2010-05-20 Ntn Corp クリープ防止・導電性転がり軸受
JP2014025553A (ja) * 2012-07-27 2014-02-06 Jtekt Corp アクチュエータユニット及びこれを備えた車両用操舵装置
JP2015200384A (ja) * 2014-04-09 2015-11-12 株式会社ジェイテクト 回転軸支持装置及び電動モータ
JP6962454B2 (ja) * 2018-04-12 2021-11-10 日産自動車株式会社 回転電機

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Publication number Priority date Publication date Assignee Title
JP2000356256A (ja) * 1999-06-16 2000-12-26 Fuji Electric Co Ltd トルク検出装置
JP2002136007A (ja) * 2000-10-20 2002-05-10 Fujitsu General Ltd 電動機の回転子およびその製造方法
JP2002233112A (ja) * 2001-02-05 2002-08-16 Showa Corp 電動パワーステアリング装置
JP2003237599A (ja) * 2002-02-18 2003-08-27 Koyo Seiko Co Ltd 電動パワーステアリング装置
JP2007247711A (ja) * 2006-03-14 2007-09-27 Nsk Ltd 水中回転装置用転がり軸受
JP2010154751A (ja) * 2010-03-30 2010-07-08 Shingo Sekiguchi 誘導型電動機の構造
JP2014225971A (ja) 2013-05-16 2014-12-04 本田技研工業株式会社 電動機
JP2017093076A (ja) * 2015-11-05 2017-05-25 日産自動車株式会社 回転電機

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Title
See also references of EP4068587A1

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2023019591A (ja) * 2021-07-29 2023-02-09 株式会社アイシン 駆動装置

Also Published As

Publication number Publication date
EP4068587A4 (en) 2022-11-30
JPWO2021105735A1 (https=) 2021-06-03
JP7447914B2 (ja) 2024-03-12
EP4068587A1 (en) 2022-10-05
EP4068587B1 (en) 2025-11-12

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