• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    An electromechanical assembly comprising an electric machine (20) coupled to a gearbox (30), the electric machine having a single bearing (40) at the rear, one of the electric machine and the gearbox having a male shaft (33) and the other a female shaft (23) engaged on the male shaft, the shafts having conical bearing surfaces (56, 59) and the assembly comprising an elastically deformable element (90) urging said bearing surfaces in relative axial displacement until that they come in commitment.
    公开号:FR3035933A1
    申请号:FR1554039
    申请日:2015-05-05
    公开日:2016-11-11
    发明作者:Didier Calmettes；Samuel Koechlin
    申请人:Moteurs Leroy Somer SA；
    IPC主号:
    专利说明:

    [0001] The present invention relates to electromechanical assemblies comprising an electric machine and a gearbox, and more particularly but not exclusively those in which the electric machine is a motor, in particular an automobile traction motor. It is known to assemble an electric motor and a gearbox by means of a splined connection, one of the shafts being a male shaft and the other a female shaft, which is typically a shaft having a hollow end portion in which is a sleeve. To allow the assembly of the trees, a game must exist at the level of the grooves, which is source of wear and noise. The motor may have only one bearing at the rear, the motor shaft being guided at the front by the shaft of the gearbox, which can be supported by two bearings. Typically, the splines of the male shaft are cut directly therein, while those of the female shaft are machined in the socket.
    [0002] It is known to add a centering span between the male shaft and the female shaft in front of the splines, to reduce the tendency of the splines to misalign in operation under the effect of the radial force related to the magnetic forces of the electric machine and to generate contact corrosion wear. The game conventionally present for mounting the shafts at the centering range is of the order of 5 to 35 microns, which allows an angular displacement misalignment of the order of 0.06 ° to 0.4 °. This displacement leads to spline wear which is a source of noise and wear negatively impacting the life of the assembly. In order to damp the movement between the male and female shafts, it is known from US Pat. No. 3,686,895 and US Pat. No. 102644636 to radially interpose damping elements such as O-rings at the splines, or at the cylindrical bearing surface. There is a need to further improve the electromechanical assemblies comprising a motor and a reducer coupled to the motor in particular to reduce noise and wear in operation.
    [0003] The invention aims to meet this need and relates to an electromechanical assembly comprising an electric machine coupled to a gearbox, the electric machine comprising a single bearing at the rear, one of the electric machine and gearbox comprising one male shaft and the other a female shaft engaged on the male shaft, the five shafts having conical bearing surfaces and the assembly comprising an elastically deformable element urging said bearing surfaces in relative axial displacement, because of the support of the conical doors between them, until they come into engagement. The invention makes it possible, by axially charging the rear bearing of the motor, that is to say by placing it in axial prestressing, to limit its wear and the noise generated. In addition, the invention ensures a good centering of the male shaft within the female shaft, which limits the wear of the cooperating reliefs of the two shafts. Finally, the contact between the conical bearing surfaces can improve the retention of the grease that may be present at the interface between the shafts.
    [0004] Preferably, torque transmission is provided by cooperating splines formed on the male and female shafts. The female shaft is preferably that of the electric machine, but alternatively it is that of the gearbox. The electric machine is preferably a motor, preferably with a rotation speed of between 10,000 and 18,000 rpm. This engine can be an automobile traction engine. Preferably, the assembly comprises one or more O-rings interposed radially between the male and female shafts. In the presence of grease, the O-ring (s) have the advantage of ensuring a retention thereof, making it possible to guarantee the lubrication of the transmission reliefs of the torque between the male shaft and the female shaft in the long term. Preferably, the reducer comprises a seal applying to the shaft in front of that of the electric machine. The female shaft may have a shrink sleeve in a housing of the female shaft.
    [0005] 3035933 3 The cone half-angle of the tapered bearing surface of the female shaft can be between 5 ° and 45 °. Preferably, the rear bearing is a ball bearing. The invention will be better understood on reading the following detailed description of a nonlimiting example of implementation thereof, and on examining the appended drawing, in which: FIG. 1 represents schematically and partially in axial section an example of an electromechanical assembly according to the invention, and - Figures 2 to 4 show details of Figure 1.
    [0006] The assembly 10 shown in FIG. 1 comprises an electric machine 20 and a gearbox 30 coupled to the machine 20. The machine 20 and the gearbox 30 comprise respective housings 21 and 31 which are assembled together, for example by bolting. The machine 20 is in the example considered an electric motor, and comprises a rotor 22 whose shaft 23 rotates about an axis X. The rotor 22 is internal to a stator 25. The machine 20 can be a permanent magnet motor. The shaft 23 is supported at the rear by a bearing 40, carried by a flange 26 of the machine 20.
    [0007] The gearbox 30 has an input shaft 33 which is guided at the front and rear by respective bearings 34 and 35. The bearings 40, 34 and 35 are preferably ball bearings. A lip seal 36 may be provided, as illustrated, to be applied to the shaft 33 in front of the bearing 34. This seal may retain the grease of the reducer.
    [0008] A mechanical connection, shown more particularly in FIG. 2, ensures the transmission of the torque between the shafts 23 and 33. This connection is in the example considered a splined connection, the shaft 33 comprising a fluted male portion 38 engaged in a sleeve 28 fretted in a female portion 29 of the shaft 23.
    [0009] The splines 52 of the shaft portion 38 extend axially between the shaft end 54 and a groove 55 formed in front of a conical bearing surface 56. The grooves 57 of the sleeve 28 extend between the rear end 58 of the socket and a tapered seat 59.
    [0010] The sleeve 28 may comprise, as shown in FIG. 3, in front of the flutes 57, a portion 70 of cylindrical inner surface of revolution of axis X, and in front of this portion, the conical bearing surface 59 mentioned above, of half angle at the top a. The male shaft comprises, behind the splines 52, as illustrated in FIG. 4, an annular groove 71, and behind it, the above-mentioned conical bearing surface 56 having a half-angle at the apex of the same value. that the angle has the conical bearing 59 of the sleeve. The conical bearing surfaces 59 and 56 of the female shaft and of the male shaft come into contact, under the effect of the return of an elastic element 90. In the example under consideration, this elastic element 90 is interposed axially between the rear bearing 40 and the housing of the electric machine 20, and it has been schematically shown in Figure 1. It is for example a spring steel spring washer, or a flat spring. This elastic element 90 has sufficient deformability to compensate for the assembly tolerances between the shafts 23 and 33, so as to guarantee contact between the conical bearing surfaces 56 and 59 and to put the rear bearing 40 in axial stress. the conical bearing surfaces 56 and 59 have a double advantage; on the one hand it reduces the wear and noise of the rear bearing 40 by loading it; on the other hand it reduces wear and noise at the splines by improving the centering and forming a joint tending to oppose the start of the grease present at the splines. The connection may comprise, as illustrated, an O-ring 75 interposed between the shafts at the flutes. This O-ring is received in annular grooves facing, formed on the trees.
    [0011] 3035933 5 The expression "comprising one" must be understood as being synonymous with "comprising at least one".
    权利要求:
    Claims (9)
    [0001]
    REVENDICATIONS1. An electromechanical assembly comprising an electric machine (20) coupled to a gearbox (30), the electric machine having a single bearing (40) at the rear, one of the electric machine and the gearbox having a male shaft (33) and the other a female shaft (23) engaged on the male shaft, the shafts having conical bearing surfaces (56, 59) and the assembly comprising an elastically deformable element (90) urging said bearing surfaces in relative axial displacement until that they come in commitment.
    [0002]
    2. An assembly according to the preceding claim, the transmission of torque being provided by cooperating grooves (52,57) formed on the male and female shafts.
    [0003]
    3. Assembly according to one of the preceding claims, the female shaft being that of the electric machine (20).
    [0004]
    4. The assembly of claim 3, the electric machine being a motor, preferably with a rotation speed of between 10,000 and 18,000 rpm.
    [0005]
    5. An assembly according to the preceding claim, the motor being an automotive traction motor.
    [0006]
    6. An assembly according to any one of the preceding claims, comprising one or more O-rings (75) interposed radially between the male and female shafts.
    [0007]
    7. An assembly according to any one of the preceding claims, the female shaft (23) having a sleeve (28) hooped in a housing of the female shaft.
    [0008]
    8. An assembly according to any one of the preceding claims, the half-angle (a) of the cone of the conical bearing surface of the female shaft being between 50 and 450.
    [0009]
    9. An assembly according to any one of the preceding claims, the rear bearing (40) being a ball bearing.
    类似技术:
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    FR3001266A1|2014-07-25|Mechanical coupling system for coupling shaft of injection pump with cam shaft of thermal engine of automobile, has providing unit providing axial force on male and/or female part so as to provide pressure from male part into female part
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    同族专利:
    公开号 | 公开日
    FR3035933B1|2017-06-09|
    CN107636333A|2018-01-26|
    EP3292619B1|2019-06-12|
    WO2016177550A1|2016-11-10|
    EP3292619A1|2018-03-14|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US2317070A|1941-12-23|1943-04-20|Letourneau Inc|Shaft and hub connection|
    DE20215010U1|2002-09-28|2003-11-13|Schrick Gmbh Dr|Coupling device for connecting the crankshaft of an internal combustion engine and an electrical generator|
    US20070273229A1|2006-05-26|2007-11-29|Delta Electronics, Inc.|Fan, motor and bearing structure thereof|
    US3686895A|1971-03-19|1972-08-29|Gen Motors Corp|Damped shaft coupling|
    US4185514A|1978-10-02|1980-01-29|Edwards E David|Adapter for motor-speed reducer sets|
    CN1323005C|2001-12-03|2007-06-27|日本精工株式会社|Electric power steering device|
    CN102644636A|2012-05-07|2012-08-22|南通瑞鑫电子电器有限公司|Spline pair with rubber ring|
    CN102801245B|2012-09-05|2014-06-04|四川阿克拉斯电动车有限公司|Electric vehicle hub motor double clutch planet gear-shifting mechanism|WO2020086997A1|2018-10-25|2020-04-30|Linamar Corporation|Motor to gearbox assembly with attachment means|
    CN113710909A|2020-04-21|2021-11-26|华为数字能源技术有限公司|Power assembly and vehicle|
    CN112003415A|2020-09-18|2020-11-27|康富科技有限公司|Single-support permanent magnet motor|
    法律状态:
    2016-04-20| PLFP| Fee payment|Year of fee payment: 2 |
    2016-11-11| PLSC| Search report ready|Effective date: 20161111 |
    2017-04-28| PLFP| Fee payment|Year of fee payment: 3 |
    2018-05-02| PLFP| Fee payment|Year of fee payment: 4 |
    2019-04-30| PLFP| Fee payment|Year of fee payment: 5 |
    2020-04-27| PLFP| Fee payment|Year of fee payment: 6 |
    2021-05-26| PLFP| Fee payment|Year of fee payment: 7 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1554039A|FR3035933B1|2015-05-05|2015-05-05|ELECTROMECHANICAL ASSEMBLY COMPRISING AN ELECTRICAL MACHINE COUPLED WITH A REDUCER|FR1554039A| FR3035933B1|2015-05-05|2015-05-05|ELECTROMECHANICAL ASSEMBLY COMPRISING AN ELECTRICAL MACHINE COUPLED WITH A REDUCER|
    EP16719314.3A| EP3292619B1|2015-05-05|2016-04-15|Electromechanical assembly comprising an electrical machine coupled to a reduction gear|
    CN201680026315.0A| CN107636333A|2015-05-05|2016-04-15|Including the electromechanical assemblies for the motor for being attached to deceleration device|
    PCT/EP2016/058357| WO2016177550A1|2015-05-05|2016-04-15|Electromechanical assembly comprising an electrical machine coupled to a reduction gear|
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