• 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:
    ELECTRICAL MACHINE, SPECIALLY OF A PUMP UNIT. The invention relates to an electric machine (1), which in a machine housing (7) comprises a stator (11) and a rotor (10), which is arranged on a motor shaft (4), which on the side B is supported on a bearing unit (14), which has a ball bearing arrangement (21, 22) and which is radially elastic as well as axially movable inside the machine housing (7). Preferably, the electric machine (1) is coupled on side A without bearings, by means of a rigid shaft coupling (12), to a working machine (2), in particular to a hydraulic pump.
    公开号:BR112013014838B1
    申请号:R112013014838-1
    申请日:2011-05-18
    公开日:2021-02-17
    发明作者:Frank Gutjahr；Peter Lemke
    申请人:Baumuller Nurnberg Gmbh；
    IPC主号:
    专利说明:

    [0001] [0001] The invention relates to an electric machine. Such an electric machine is, for example, known from DE 23 09 351 A1. An electric machine is especially an electric motor, which as the motor of a pump unit can be coupled to a working machine, for example, a hydraulic pump (power steering pump).
    [0002] [0002] Such an electric machine normally has two bearings rotatably supported on the motor shaft supported on the tips of the rotor axes (armature), which are received by bearing plates covered at the front end by the machine frame. In this way, the lateral outlet bearing referred to as bearing A (bearing plate A) is, as a rule, an axial load bearing, while the rotor bearing, more specifically, the armature bearing located on the opposite side is often made as a sliding base, in order to be able to balance the thermal expansion of the rotor (armature). The arrangement of the axial load bearing and the sliding base can also be reversed.
    [0003] [0003] With connection to a working machine, for example a pump to stimulate hydraulic fluidity, the electric machine then also called a motor is often mechanically linked to a working machine (pump) via a rotating shaft. The coupling of the motor shaft with the shaft (pump shaft) of the working machine can be carried out through a transmission or through a coupling. Such shaft couplings in the operation of such a unit ensure the necessary balance of manufacturing tolerances and / or assembly tolerances, as well as the balance of different extensions of the electrical machine's rotor and stator thermal duration, to incorporate corresponding path differences .
    [0004] [0004] The use of such a coupling, often containing elements subject to wear in servo-operated hydraulic pumps (hydraulic unit), however, requires additional construction space and also reduces the torsional stiffness of the connection shaft. This leads, in particular to a servo-operated hydraulic pump, for example with a pressure control driven by a converter, especially in highly dynamic applications, which require broadband rotation moment control, to a significant deterioration of the width of control circuit band used.
    [0005] [0005] The purpose of the invention is to supply an electric machine, which, especially in relation to the shaft bearing, is capable of being better coupled and is capable of being coupled more easily and securely to a working machine, in particular to a hydraulic pump.
    [0006] [0006] For this purpose, the electrical machine features a bearing unit with a ball bearing arrangement arranged radially and movably axially within the B side of the bearing plate or a bearing hub that is located there . For this purpose, the ball bearing arrangement inside the bearing hub is suitably surrounded by a sleeve or bearing bush, which in turn is placed, slightly axially, in a radially movable manner, on an elastomeric element. , in particular an O-ring.
    [0007] [0007] The ball bearing arrangement advantageously features two grooved ball bearings, which due to the elastomeric element is received radially and axially movable in a bearing hub also in a standardized manner by the electric machine (motor electric). In order to prevent the rolling elements of the ball bearing from sliding, the simply and economically constructed bearing unit is made as a paired module.
    [0008] [0008] The invention is based on the consideration that a compact construction of an electric motor as a motor and of a drive machine, for example in the form of a hydraulic pump, can be achieved when the electric motor is mounted without A bearing itself, through a rigid shaft connection, that is to say a rigid shaft coupling or a continuous shaft on the driving machine, which in turn has its own bearing determined axially and radially on the machine shaft. In order to make this possible, an overdetermination of the motor bearing must be perceptibly avoided. This can also be achieved when the B-side bearing is made radially elastic and at least slightly axially movable from the motor shaft without A-side bearings.
    [0009] [0009] Such radial and slightly axial mobility of a free bearing can be carried out to prevent fixation, as well as for stabilization, in a manner known per se from DE 198 18 634 A1, through a sleeve, which, for one on the one hand, it incorporates an arrangement of ball bearings and, on the other hand, it is supported radially from the outside on an elastic element. The sleeve with the ball bearings fitted is also inserted in a bearing hub on the B side in a standardized manner and, during the assembly situation, is placed on the elastic element provided on the outer perimeter of the sleeve.
    [0010] [00010] The initial force inside the bearing unit occurs, appropriately, via a compensating disk, preferably in the form of a corrugated spring, in which grooved ball bearings are axially secured against each other . In this way, without an external load on the motor shaft, the minimum necessary load of the ball bearing is also guaranteed and the rolling elements of the ball bearing are prevented from sliding, so that a failure of these rolling elements is safely prevented.
    [0011] [00011] Suitably, the bearing unit has an adjustment disc, as a separator, between the inner rings of both grooved ball bearings. In addition, an external retaining ring is suitably provided, which keeps the outer bearing ring of the ball bearing adjacent to the bearing unit of that outer retaining ring in an axial position. This outer retaining ring is properly inserted with its outer edge on one side of the inner wall of the annular groove retracted from the bearing sleeve or bearing bush.
    [0012] [00012] An additionally provided inner retaining ring, which in turn is preferably arranged on that side of the bearing, in which also the corrugated spring and the outer retaining ring are provided, ensures an axial fixation of the adjacent inner bearing ring of the arrangement ball bearings. The inner retaining ring is placed with its outer edge in an annular groove inserted in the perimeter of the motor shaft on the bearing side of the shaft body.
    [0013] [00013] For the assembly of a drive unit with the electric machine as a motor and with a working machine, the motor rotor is first placed with a fixing disc placed on its motor shaft on the shaft end facing the machine shaft of the working machine and driven to a mounting platform, where the fixing disc is then attached and the shaft ends of the motor shaft are rotatably connected to the shaft ends of the machine shaft, and where then the machine frame containing the stator is pushed over the rotor and fixed to a flange of the work machine. The platform is advantageously produced by means of a construction plan or mold designed or estimated to be detachable on the flange of the working machine.
    [0014] [00014] The advantages obtained with the invention consist in particular that a radially static and a radically static or thermally induced bearing with balanced tolerances or bearing unit in the form of a module attached to it is provided, instead of a ball bearing a standardized bearing plate can be received on the bearing hub. Thus, on the one hand, no special bearing plate is required, which allows a machine bearing, more specifically, a low-cost motor bearing. On the other hand, the bearing unit developed in accordance with the invention comprises only a simple, symmetrically rotating bearing sleeve and otherwise only standardized and standardized construction components at affordable costs. In addition, the mounting of the bearing unit on the bearing hub is limited to a simple insertion of the bearing module.
    [0015] [00015] In addition, a rotation safety of the bearing unit is produced on or against the bearing hub only through the end of friction via an elastomeric element (O-ring), so that the elastomeric element (O -ring) fulfills a dual function, namely, on the one hand, the radial elasticity of the bearing unit and, on the other hand, its rotation safety. Thus, no additional clamping of the sleeve with the bearing hub is necessary to prevent rotation of the sleeve or the bearing unit. In addition, the elastomer, more specifically, the O-ring acts only as a bearing support and does not require the adoption of forces.
    [0016] [00016] The electric machine and, in particular, the bearing unit according to the invention makes it possible to supply a unit, at a comparative level, with cost reduction, with a rigid shaft connection or also with a continuous shaft between the electric machine (electric motor) serving as the motor and the drive machine, for example, in the form of a hydraulic pump, in which the electric motor has no bearing A. The static tolerance balance only necessary in such a coupling of Properly fixed shaft in the form of a single-piece continuous shaft or shaft connection via the clamping disc is carried out, based on the bearing unit developed in accordance with the invention, not on the rotary axis reference system, via a then necessary dynamic tolerance balance, in the form of an expensive shaft coupling. Furthermore, the bearing on the B-side radially elastic and axially movable of the motor, according to the invention, ensures the tolerance balance in the same static way.
    [0017] [00017] The machine according to the invention and, in particular, the bearing unit, according to the invention, are especially suitable for power steering pumps and such applications, in which the direct construction of an electric motor in advantage is advantageous. a drive machine to be driven in a self-positioned manner. The electric machine can, however, also be operated as a generator or the like.
    [0018] [00018] In combination with an integrated fixed shaft coupling, which can be operated via a radial inlet, and, based on the modular structure of the bearing unit on the connection, with transport security that can be properly resolved on side A when assembling the electric motor, the electric machine, more specifically, the electric motor can be built in the form of a kit. This also makes it possible to use it with a thin, fast-rotating electric motor. In addition, a motor construction on a suitable bearing of the machine with the input shaft can also occur on the part of the customer.
    [0019] [00019] Below are described in more detail examples of embodiments of the invention, with reference to a drawing. So it is shown:
    [0020] [00020] Figure 1 in a partial longitudinal section of a pump unit with an electric motor with a motor shaft without bearings on side A and supported by bearings on side B, Figure 2 in an enlarged section I of Figure 1 the B-side bearing unit with two grooved ball bearings inside the bearing sleeve, and Figure 3 shows the pump unit, according to Figure 1, with a platform mold and an axle fixing disk for the coupling of the motor shaft with a pump shaft. The components corresponding to each other are provided in all figures with the same reference numbers.
    [0021] [00021] Figure 1 shows, in a longitudinal section, an electric motor 1, which is coupled, with a pump 2, for example a hydraulic pump, to a pump unit 3. Inside the pump unit 3, the motor electric 1 forms the electric motor, while the hydraulic pump 2 is the drive machine. The motor shaft 4 of the electric motor 1 and the machine shaft 5 of the pump 2 are fixedly connected to each other by means of a shrinking or clamping disc 6. To do this, the shaft end 8 on the A side of the drive shaft. motor 4 driven out of a machine housing 7 hereinafter referred to as the motor housing engages with the shaft end 9, facing east, of the machine shaft 5 of the pump 2 to be coupled. After fastening the fixing disc 6, the shaft ends 8, 9 are secured to each other and are protected against rotation and without play.
    [0022] [00022] The motor shaft 4, driven out of the motor housing 7 of the electric motor 1, without bearing on the outlet side (side A) comprises a rotor (armature or armature) 10, where inside the motor housing 7 in front is a stator 11 attached to the housing under crack formation. Inside the motor housing 7, the shaft end on the B side (shaft body) 13 of the motor shaft 4, which is located in front of the coupling point 12, formed via the rigid connection of the shaft ends 8, 9, is mounted on a bearing unit 14. The bearing unit 14 shown enlarged in Figure 2 is fitted to a bearing hub 15 of a bearing plate 16 on side B.
    [0023] [00023] The motor housing 7 is connected to a pump flange 17 of the pump 2, via bolts of the flange 18, in the zone of the coupling point 12. Under the coupling point 12, the electric motor 1 without bearing A on the rigid coupling of the shaft ends 8, 9 is connected to the driven pump 2, which in a form not shown in more detail has a complete bearing of its own, so that the position of the motor shaft 4 is fixed axially and radially.
    [0024] [00024] Signal and power connectors 19 or 20 extraordinary of the motor housing 7 are used for the connection of the pump unit 3 powered by an electric motor, for example, in a (not shown) frequency converter for the regulated control of the rotation moment and / or rotation speed of the electric motor 1. In the form of a power steering pump, the current volume of the hydraulic oil, for example, stimulated by pump 2 through the rotation speed of the electric motor motor 1 , is adjusted and controlled, while the adjustment of the pressure of the pumped fluid occurs through an adjustment of the rotation moment of the electric motor 1.
    [0025] [00025] As it is comparatively clearly visible from Figure 2, the bearing unit 14 on the B side of the electric motor 1 comprises two ball bearings with grooves 21, 22 arranged next to each other, which are arranged inside of a sleeve (bearing sleeve or bearing bush) 23. The bearing unit 14 further comprises an elastomeric element, in the form of an O-ring 24, which is arranged around the outside of the sleeve of the bearing 23, and it is inserted in an annular groove 25. In the embodiment example, in the inner perimeter of the bearing hub 15, the annular groove 25 is incorporated in it. Alternatively, annular groove 25 can, however, also be incorporated into the bearing sleeve 23.
    [0026] [00026] The adjustment conditions are so chosen that, via the O-ring 24, a certain balance of radial tolerance is possible. The bearing sleeve 23 is then inserted in the bearing hub 15, more specifically, in the bearing plate B 16, which also ensures a certain mobility of the bearing sleeve 23 in both axial directions in the axial direction. . A joint rotation of the bearing sleeve 23 of the bearing unit 14 with essentially no load on the bearing hub 15 is prevented due to friction between the bearing sleeve 23, the O-ring 24 and the bearing hub 15.
    [0027] [00027] Both ball bearings with grooves 21, 22 are, via a compensating disk, in the form of a corrugated spring 26, secured against each other. The compensating disc 26 uses the outer ring 22a of the outer grooved ball bearing 22 facing the bearing plate 16 on the B side. outer retaining ring 27, which with its outer edge 28 fits into an annular groove 29 on the inner perimeter of the bearing sleeve 23. The outer retaining ring 27 is used for axial securing of the outer ring of bearing 22a closest to the bearing grooved ball bearing 22.
    [0028] [00028] An internal retaining ring 30 in the same manner provided for in the area of the compensation disc or the corrugated spring 26 is used for the axial fixation of the inner ring of the bearing 22b, adjacent to the grooved ball bearing 22 and fits with its outer edge 31 in an annular groove 32, inserted from the side of the shaft end to the perimeter side of the motor shaft 4. Between both inner rings of bearing 21b and 22b of both ball bearings with grooves 21 or 22 if it finds an adjustment disc 33 on the axle tip or the axle body 13 of the motor shaft 4.
    [0029] [00029] The inner rings 21b, 22b and outer rings 21a, 22a, moving towards each other and separated by rolling elements 34, of both ball bearings with grooves 21 or 22 are supported on side A without motor bearings electric 1, on the one hand on a support / recess of the system 35 raised from the shaft end or from the shaft body 13 of the motor shaft 4 and, on the other hand, on a support / flange of the system 36 of the bearing sleeve 23. On the opposite side of the system flange 36, the bearing sleeve 23 executed as a bearing bush is provided on one side with an inner ring 37, with which the bearing sleeve 23 is fitted in an outline of the corresponding recess 38 of the hub of bearing 15.
    [0030] [00030] The arrangement of the bearing unit 14, with the bearing sleeve 23 and both corresponding to ball bearings with grooves 21, 22, as well as the O-ring 24 on the outside of the sleeve, is received in the hub bearing 15 radically elastic and at least slightly axially movable. With this pre-stressed bearing unit 14 via the corrugated spring 26, used as a compensating disc to prevent the rolling elements 34 from sliding, overdetermining the motor bearing of the electric motor 1 coupled with the pump 2 over a connection is avoided fixed axis. The prestressed bearing unit 14 is supported on the B side of the shaft end 13, that is, on the shaft body of the motor shaft 4 and thus of the rotor or armature 10 of the electric motor 1. The construction and development of the bearing 14, according to the invention, allows its incorporation in a standardized bearing hub 15 of a standardized bearing plate B 16.
    [0031] [00031] Figure 3 shows the pump unit 3 with the rotor 10 of the electric motor 1 placed on the tip of the shaft 9 of the machine shaft 5 of the pump 2, in a first assembly step 1. In this case, the tip of the axis 8 of the motor shaft 4 of the electric motor 1 already supports the shrink disk or fixing disk 6. In this assembly step, a construction mold 39 is fixed or placed on the flange 17 of the pump 2. In the application of the mold 39 , the rotor 10, which is on the motor shaft 4 with the bearing unit 14 for this purpose mounted on the B side of the shaft body 13, is pushed over the shaft end 9 of the machine shaft 5 of the pump 2 until it stops in the mold 39. In this state, the motor shaft 4 is positioned axially exactly to the flange of the pump 17. Then, the fixing discs 39 are fastened by means of the screwing and, thus, the ends of the shafts 8 and 9 they are fixedly coupled to each other.
    [0032] [00032] In the next assembly step, the mold 39 is removed. Then, the motor housing 7, including the stator 11, is pushed on the rotor 10 and fixed on the flange of the pump 17, by means of screwing. In this way, the bearing unit 14 is incorporated in the bearing hub 15, in which annular groove 25 of the O-ring 24 is already inserted.
    [0033] [00033] In short, for the assembly of a drive unit 3 with an electric machine 1, according to the invention, as a motor and a working machine 2, in particular a hydraulic pump, the rotor 10 of motor 1 is first placed with a fixing disc 6 placed on the motor shaft 4, especially in a step prior to assembly, on the shaft end 9 facing the machine shaft 5 of the working machine 2 and guided to a mounting platform 39. Then, the fixing disc 6 is secured and the motor shaft 4 is thus rotatably connected to the shaft end 9 of the machine shaft 5. Then, the machine housing 7 containing the stator 11 is pushed over the rotor 10 and fixed to flange 17 of the working machine 2. List of numerical references 1 Electric motor 2 Pump 3 Pump unit 4 Motor shaft 5 Machine spindle 6 Shrink / clamp disc 7 Machine / motor housing 8, 9 Shaft end 10 Rotor / armature 11 Stator 12 Coupling point 13 Shaft tip / body 14 Bearing unit 15 Bearing hub 16 Bearing plate B 17 Pump flange 18 Flange bolt 19 Signal connector 20 Power connector 21, 22 Grooved ball bearings 21a Outer ring 21b Inner ring 22a Outer ring 22b Inner ring 23 Bearing Sleeve / Bushing 24 O-ring 25 Ring groove 26 Compensating disc / corrugated spring 27 Outer retaining ring 28 External board 29 Ring groove 30 Inner retaining ring 31 External board 32 Ring groove 33 Adjusting dial 34 Rolling Bodies 35 System support / recess 36 System support / flange 37 Inner ring 38 Recess contour 39 Construction mold
    权利要求:
    Claims (8)
    [0001]
    Electric machine (1), which in a machine frame (7) comprises a stator (11) and a rotor (10), which is arranged on a motor shaft (4) supported on side B, with a unit provided of bearing (14) with a ball bearing arrangement (21, 22) arranged on the B side movably axially inside the machine housing (7), characterized by the fact that, - the bearing unit (14) has a sleeve (23) that surrounds the ball bearing arrangement (21, 22) and an elastomeric element (24), on which the sleeve (23) is placed radially and movably in the axial direction, - the motor shaft (4) on side A to be driven without bearings out of the machine frame (7) and driven to a coupling point (12), in which a fixing disc (9) is provided for the coupling rigid motor shaft (4) with a machine shaft (5) of a working machine (2), and - the bearing unit (14) has an inner retaining ring (30) for axial fixation of the adjacent inner bearing ring (22b) of the ball bearing arrangement (21, 22), the retaining ring with its edge outer ring (31) arranged in an annular groove (32) provided peripherally on the bearing side of the shaft body (13) of the motor shaft (4).
    [0002]
    Electric machine (1), according to claim 1, characterized in that the elastomeric element (24), in particular an O-ring, is received by an annular groove (25), which is inserted in the sleeve (23) of the outer side or in a bearing hub (15), which incorporates the bearing unit (14).
    [0003]
    Electric machine (1), according to either of the vindications 1 or 2, characterized by the fact that the elastomeric element (24) is so received by an annular groove (25) and is inserted from the outside on the sleeve (23) or in a bearing hub (15), that the sleeve (23) is kept axially movable and safe from twisting in a bearing hub (15).
    [0004]
    Electric machine (1) according to any one of claims 1, 2 or 3, characterized in that the ball bearing arrangement (21, 22) comprises, by means of a compensating disc (26) of the corrugated spring type , two grooved ball bearings locked against each other.
    [0005]
    Electric machine (1), according to claim 4, characterized in that the bearing unit (14) has an adjustment disc (33) disposed between the inner rings (21b, 22b) of the grooved ball bearings (21 , 22).
    [0006]
    Electric machine (1) according to any one of claims 1, 2, 3, 4, or 5, characterized in that the bearing unit (14) has an outer retaining ring (27) for the axial fixation of the ring adjacent bearing exterior (22a) of the ball bearing arrangement (21, 22).
    [0007]
    Electric machine (1), according to claim 6, characterized in that the outer retaining ring (27), with its outer edge of the disc (28) fits into an annular groove (29) provided on the inner side of the sleeve (23).
    [0008]
    Drive unit (3) with an electric machine (1), as defined in any one of claims 1, 2, 3, 4, 5, 6, or 7, as a motor, and with a working machine (2), in especially a pump with received bearing, preferably a hydraulic pump.
    类似技术:
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    同族专利:
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    BR112013014838A2|2016-10-04|
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    EP2652347B1|2015-07-08|
    US20130280110A1|2013-10-24|
    US9312736B2|2016-04-12|
    CN103261719B|2016-08-17|
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    RU2013124393A|2015-01-27|
    JP5834090B2|2015-12-16|
    CA2818879C|2017-12-12|
    CN103261719A|2013-08-21|
    JP2014506108A|2014-03-06|
    RU2554048C2|2015-06-20|
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    法律状态:
    2018-12-26| B06F| Objections, documents and/or translations needed after an examination request according art. 34 industrial property law|
    2020-06-16| B06U| Preliminary requirement: requests with searches performed by other patent offices: suspension of the patent application procedure|
    2020-10-20| B06A| Notification to applicant to reply to the report for non-patentability or inadequacy of the application according art. 36 industrial patent law|
    2020-12-08| B09A| Decision: intention to grant|
    2021-02-17| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 18/05/2011, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    DE102010054800|2010-12-16|
    DE102010054800.6|2010-12-16|
    DE102011009714.7|2011-01-29|
    DE102011009714|2011-01-29|
    PCT/EP2011/002459|WO2012079654A1|2010-12-16|2011-05-18|Electric machine, in particular of a pump unit|
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