JP4505746B2 - Stator position measuring device and measuring method - Google Patents

Description

  The present invention relates to a motor case including a motor case, a rotor that is pivotally supported by the motor case and rotates inside, and a stator that is concentric with the rotor and disposed on the outer periphery of the rotor. The present invention relates to a measuring apparatus and a measuring method for measuring a position.

In recent years, so-called hybrid vehicles equipped with an engine and a motor drive device as a drive source for automobiles have attracted attention in terms of fuel consumption and environmental protection. In this type of hybrid vehicle, the motor drive device acts as a motor that generates electric power from the battery and generates the driving force. Sometimes it works as a generator and serves to charge the battery. In addition, a so-called regenerative operation is also performed in which the inertial force that the vehicle has during braking is recovered as electric power. Furthermore, a motor drive device may be used for starting the engine.
Therefore, the motor driving device provided in the hybrid vehicle is configured such that the rotor is drivingly connected to the transmission mechanism side and the engine side, so that driving force can be transferred.

  The motor drive device includes a stator and a rotor housed in the stator, and the stator and the rotor are supported from the motor case side. The support of the stator is a fixed support, and the support of the rotor is a rotation support from a shaft support portion provided in the motor case. Usually, in a hybrid vehicle, the motor case is rarely provided alone, and a part of the transmission case in which the transmission mechanism is housed is also used as the motor case.

  In the motor drive device, the gap and concentricity between the stator and the rotor are extremely important requirements that determine the performance of the motor drive device, and are strictly managed and adjusted.

  As a technique for performing this type of adjustment, there is a technique disclosed in Patent Document 1. This technique relates to a gap adjusting device for an electric vehicle motor, and an adjustment bolt 46 is provided upright on the flywheel housing 12 (equivalent to the motor case described so far) to adjust the outer peripheral portion of the stator core 42. Adjust the gap. The stator 14 in this example is relatively thin. That is, the thickness of the stator in the axial direction of the rotor (which shares the axis with the stator) is relatively small.

JP 7-241050 A

However, the adjustment method shown in this prior art is not preferable because it requires parts (adjustment bolts 46) other than the parts essential for the configuration of the motor drive device, and it is necessary to provide bolt holes in the motor case.
Furthermore, recently, it is necessary to increase the thickness of the motor drive device in the axial direction of the rotor in relation to the performance required for the motor drive device in a hybrid vehicle. FIG. 1 schematically shows a schematic configuration of a thick motor driving apparatus configured to answer such a request. The left side of the figure corresponds to the engine room ER side where the engine E is arranged, and the right side of the figure corresponds to the transmission mechanism room TR side where the transmission mechanism T is arranged.

  The stator S includes a stator core SC and a stator coil SW for the stator core SC. The stator core SC is configured by laminating a large number of substantially ring-shaped steel plates p as shown in FIG. 2, and penetrates a fixing portion provided at a predetermined phase in the circumferential direction of each steel plate p in the laminating direction. The fastening bolt b1 is fastened and fixed to the motor case. Furthermore, the steel plate p forming the stator core SC is subjected to caulking or welding processing or the like in a predetermined phase in the circumferential direction, and relative movement between the steel plates p is restricted to some extent.

  The position of this stator core in the left-right direction in FIG. 1 (corresponding to the axial direction of the rotor, etc.) is determined by the seat surface provided in the motor case. On the other hand, with respect to the vertical direction (equivalent to the axial direction of the rotor), the storage space on the motor case side has a relatively large margin, and its position is determined by tightening the fastening bolt.

  In the configuration described above, when the thickness of the stator (the thickness in the axial direction of the rotor) is relatively thin as in the technique disclosed in Patent Document 1, the position of the stator (the stator is relative to the axis of the rotor). There was no problem even if the position of the axial center) was controlled relatively coarsely. However, as the degree of demand for motors increases and the thickness increases, it has been found that if the conventional management method is followed, vibration (including uneven rotation of the rotor) that occurs with the rotation of the motor increases.

  The cause of this problem has been found by the inventors to be due to the deformation of the stator core caused by fastening of the fastening bolt. FIGS. 3A and 3B show this deformation state. This figure shows a state in which stacked stator cores are vertically arranged, and (a) shows a state in which tightening with a fastening bolt is not performed. (B) shows a state in which the fastening bolt is tightened, and with the tightening, a relative movement is caused between the steel plates due to the individual cores of the stator core, and the state where the axis of the stator cannot maintain linearity is shown. Show. In this state, the core axis position at the intermediate position in the thickness direction of the stator core is shifted with respect to the rotor axis, and adjustment is required.

  Accordingly, it is required to accurately measure the deformation state of such a stator core. Even if the measurement can be performed accurately, if the time required for the measurement is long, the productivity is deteriorated and the manufacturing cost is increased. Therefore, it is required to measure such a deformed state quickly. However, a measuring apparatus that can satisfy such a requirement has not been obtained so far, and a measuring method that can satisfy such a requirement has not been known.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a stator position measuring apparatus and measuring method capable of quickly and accurately measuring the position of the stator with respect to the rotor axis. There is to do.

To achieve the above object, according to the present invention, a motor case comprising a motor case, a rotor that is pivotally supported from the motor case and rotates inside, and a stator that is concentrically arranged on the outer periphery of the rotor. relates, characteristic structure of the measuring device for measuring the position of the stator relative to the axis of said rotor, said housing the said stator in the motor case, in the non-inserted state in which the rotor is not inserted into the stator, the A support body that is positioned and supported with respect to a shaft support portion of the rotor, which is a pair of shaft support bearings that are supported by a motor case and determines the shaft center of the rotor, and at least three locations in the circumferential direction of the rotor, the radial position of the inner surface of the stator are arranged at least three displacement sensors capable of measuring the said support, the output of the displacement sensor Based on lies in having a stator position deriving means for determining the position of the stator relative to the axis of the rotor.

According to this characteristic configuration, the stator is housed in the motor case, and the space formed in the stator (the space where the rotor should originally be located in the assembled state) is utilized. Position measurements can be made. At this time, the radial positions of the inner diameter surfaces of the stators at a plurality of locations can be accurately measured at a time using a plurality of displacement sensors positioned and arranged with respect to the shaft support portion of the rotor by the support. As a result, the position of the stator can be measured quickly and accurately. Further, in this configuration, when the rotor is incorporated, a plurality of displacement sensors are supported by positioning with respect to the shaft support portion of the rotor which is a reference for the shaft support. Therefore, the position of the stator with respect to the axis of the rotor in the assembled state can be quickly and accurately obtained. Further, by measuring at least three locations in the axial circumferential direction of the rotor with the displacement sensor, the position of the radial center of the stator can be measured without moving the displacement sensor in the circumferential direction. Therefore, the position of the stator can be measured more quickly and accurately.

The present invention also relates to a motor case comprising a motor case, a rotor that is pivotally supported from the motor case and rotates inside, and a stator that is concentrically arranged on the outer periphery of the rotor. The characteristic configuration of the measuring method for measuring the position of the stator with respect to the shaft center is that the stator is housed in the motor case, and is supported by the motor case in a non-inserted state where the rotor is not inserted into the stator. A pair of shaft bearings for determining the shaft center of the rotor is used as the shaft support portion of the rotor, and at least three displacement sensors arranged on a support body positioned and supported with respect to the shaft support portion of the rotor the radial position of the inner surface of the stator measured constant at least three axial circumferential direction, based on the output of the displacement sensor, It lies in obtaining the position of the stator relative to the axis of the serial rotor.

According to this characteristic configuration, the position of the stator can be measured quickly and accurately as in the case of the above measuring device, and the position of the stator with respect to the rotor shaft center in the assembled state can be quickly and accurately measured. Can be sought. Further, the position of the center of the stator in the radial direction can be measured without moving the displacement sensor in the circumferential direction. Therefore, the position of the stator can be measured more quickly and accurately.

Further, in the stator position measuring apparatus and measuring method, the radial position of the inner diameter surface of the stator at at least two positions located on both ends of the stator in the axial direction of the rotor in at least three positions in the axial direction of the rotor. It is preferable to dispose the displacement sensor on the support so as to measure the above .

  According to this configuration, it is possible to measure at least positions near both ends of the stator in the axial direction of the rotor without moving the displacement sensor in the axial direction of the rotor. Therefore, the position of the stator can be measured more quickly and accurately. Further, by further increasing the number of measurement points of the displacement sensor in the axial direction of the rotor, it is possible to further increase the accuracy of the stator position that can be measured without moving the displacement sensor in the axial direction of the rotor.

In the stator position measuring apparatus and measuring method, the motor case includes a motor case main body in which the stator and the rotor are housed, and a partition cover that covers one axial opening of the rotor of the motor case main body. The first shaft support portion located on the partition cover side as the shaft support portion of the rotor, and the second shaft support portion positioned on the opposite side of the rotor body with respect to the first shaft support portion And the second shaft support portion includes a shaft support bearing held by the motor case body, the shaft support bearing held by the partition cover includes the first shaft support portion, and the positioning mechanism is provided for positioning the partition cover relative to the motor case body, the displacement of both of said first shaft support and said second shaft support based Capacitors is positioned, the positioning of the displacement sensor relative to the said second shaft support, and positioned with reference to at least the inner diameter surface of the axial support bearing, the position of the displacement sensor relative to the said first shaft support The positioning is preferably performed with the positioning mechanism as a reference .

In this case, the positioning of the displacement sensor is based on both the first shaft support portion and the second shaft support portion that are the reference in the assembled state of the motor drive device, and the shaft support portion that directly determines the axis of the rotor is used. By positioning, the accuracy of the concentricity between the stator and the rotor can be improved. Here, if the basis of the both the first shaft support and the second shaft supporting portion may be actually enters to a reference shaft support comprising a pair for supporting the rotor, improve the accuracy of concentricity it can. In addition, since the shaft bearing of the second shaft support for supporting the rotor is used directly, the relationship between the stator and the rotor in the assembled state of the rotor is reliably simulated, enabling more accurate measurement. become. Furthermore, on the first shaft support side, a partition cover for holding the shaft support bearing and a positioning mechanism for positioning the shaft support bearing are used without directly using the shaft support bearing for supporting the rotor. Therefore, although indirectly, the relationship between the stator and the rotor in the assembled state of the rotor is reliably simulated, and more accurate measurement can be performed.

In the stator position measuring apparatus, a plurality of sensor bars, which are arranged along the axial direction of the stator and to which the displacement sensor is attached, and the one end of the sensor bar are positioned and fixed as the support. An end plate, a second end plate on which the other end of the sensor bar is positioned and fixed, and a second shaft support portion fixed to a surface of the first end surface plate opposite to the surface on which the sensor bar is fixed. It is preferable that the second end face plate is positioned on the basis of the positioning mechanism.

In the stator position measuring device, it is preferable that the positioning mechanism is a knock pin and a positioning hole.

In the stator position measuring apparatus, it is preferable that the displacement sensor is a non-contact type sensor that is selectively sensitive to a magnetic material or a conductor.

  Hereinafter, the structure around the motor driving device M in which the stator position is measured and adjusted using the measurement adjustment device 1 that functions as the measurement adjustment device for the stator position according to the present application, the structure of the measurement adjustment device 1, and the device 1 are used. The fixing operation of the stator S will be described in order.

FIG. 1 is a drawing showing a cross-sectional structure around a motor drive device M housed in a mission case MC (an example of a motor case) and in an assembled state, and FIG. 2 shows a motor drive device. 2 is an exploded view showing the support structure of the stator S and the support structure of the rotor R constituting M. FIG. In FIG. 1, the left side is a part on the engine chamber ER side where the engine E is disposed, and the right side is a part on the transmission mechanism chamber TR side where the transmission mechanism T is disposed. As described above, the rotor R of the motor driving device M is configured to be connected to the engine E and the speed change mechanism T so as to be able to transmit and receive driving force to each of them.

  As can be seen from FIGS. 1 and 2, the motor driving device M includes a stator S and a rotor R. In this assembled state, the rotating shaft of the rotor R coincides with the shaft of the stator S, and the axial center position of the rotor R is determined by a pair of shaft bearings BRG supported by the transmission case MC. Hereinafter, the center of the rotation axis of the rotor R determined based on the pair of shaft bearings BRG is referred to as an axis, and the direction along the rotation axis is simply referred to as an axial direction (direction indicated by D1 in FIG. 1). The orthogonal direction is referred to as the axial diameter direction (direction indicated by D2 in FIG. 1), and the surrounding direction is referred to as the axial circumferential direction (direction indicated by D3 in FIG. 1).

  The stator S includes a stator core SC and a stator coil SW for the stator core SC. The stator core SC is configured by laminating a large number of substantially ring-shaped steel plates p as shown in FIG. The stacking direction coincides with the axial direction D1. Each steel plate p employs a configuration in which relative movement between the steel plates p is regulated by caulking or welding processing at a predetermined phase in the circumferential direction. Furthermore, each steel plate p is provided with three circumferentially projecting portions p1 that are projected in the radial direction, and bolt insertion holes p2 for fastening and fixing the stator core SC to the transmission case MC at each projecting portion p1. Is provided. The stator core SC having a laminated structure is fastened and fixed to a seat surface MC1 provided on the transmission case MC with fastening bolts b1 as fastening means.

On the inner diameter side of each steel plate p, teeth t projecting in a comb-teeth shape are provided on the inner diameter side. The stator coil SW is wound through a gap between the teeth t. An inner diameter side end surface t1 of the tooth t is an end surface extending in the circumferential direction.
The stator coil SW is impregnated with varnish and fixed in an insulated state. Furthermore, the varnish is impregnated also between the steel plates p, and is fixed in a state in which intrusion of water or the like is prevented. In addition, since the varnish is impregnated in this way, the thermal conductivity is improved and the heat dissipation is improved.

  The positioning in the transmission case MC of the stator S will be described. The positioning in the axial direction D1 is performed by seating the end surface (mainly the end surface of the projecting portion p1) of the stator core SC on the right side in FIG. It is determined by contacting the surface MC1. The stator storage space formed in the transmission case MC is expected to have a predetermined margin in the axial diameter direction D2 (vertical direction in FIG. 1), and the stator S uses the fastening bolt b1 for the transmission case MC. As long as it is not fastened, it has a predetermined backlash. Therefore, after the fastening bolt b1 is fastened, the axial center position of the stator S in the shaft radial direction D2 with respect to the transmission case MC is determined.

  The phase in the axial circumferential direction D3 of the stator S with respect to the transmission case MC is determined based on the phase position in the axial circumferential direction D3 of the seating surface MC1 provided in the transmission case MC with respect to the protrusion p1 described above. It is determined by the operation of inserting the stator S into the MC and the fastening operation by the fastening bolt b1.

  The rotor R includes a rotor body RB around a rotor shaft RA. The rotor shaft RA includes a shaft support bearing BRG1 provided on the engine chamber ER side and a shaft support bearing provided on the transmission mechanism chamber TR side. It is pivotally supported from both BRG2.

  As can be seen from FIGS. 1 and 2, the motor drive unit room MR is formed as an independent compartment between the engine room ER and the transmission mechanism room TR. In the case of the illustrated example, a partition wall W integral with the transmission case MC is provided between the motor driving device chamber MR and the transmission mechanism chamber TR, and one of the walls W for supporting the rotor R is provided. The shaft support bearing BRG2 is provided.

  On the other hand, a partition cover C that is attached and fixed to the transmission case MC is provided between the motor drive device room MR and the engine room ER. This partition cover C divides the motor drive device chamber MR by covering the end face opening MCO of the mission case MC from the left side in FIG. As can be seen from FIGS. 1 and 2, the position of the partition cover C in the axial radial direction D2 and the axial circumferential direction D3 is determined by a plurality of knock pins np provided in the end face opening MCO. The partition cover C is provided with the other shaft support bearing BRG1 for supporting the rotor R.

  As can be seen from the configuration described above, the rotor R of the motor drive device M is rotatably supported by the shaft support bearing BRG2 provided on the partition wall W and the shaft support bearing BRG1 provided on the partition cover C. In the present application, the former rotor shaft support portion RAS is referred to as a case side shaft support portion RAS2 (an example of a second shaft support portion), and the latter rotor shaft support portion RAS is referred to as a cover side shaft support portion RAS1 (an example of a first shaft support portion). ).

Measurement Adjustment Device for Stator Position FIGS. 4 to 8 show the configuration of this measurement adjustment device 1.
FIG. 4 is a cross-sectional view of an essential part for illustrating the configuration of the measurement adjustment device 1. The measurement adjustment device 1 is arranged so that the position of the stator S can be measured and adjusted in a state where the stator S is inserted into the mission case MC. It shows the situation.
5 is a plan view corresponding to FIG. 4, FIG. 6 is a cross-sectional view taken along the line AA of FIG. 4, and FIG. Further, FIG. 8 is an exploded view thereof.

  This measuring and adjusting apparatus 1 accommodates a stator S in a mission case MC, the stator S is supported in the axial direction D1 of the rotor R, and the stator S in a state where the rotor R is not inserted and the rotor R is not inserted into the stator S. Is measured (position in the axial diameter direction D2 of the stator S). Further, the measurement adjusting device 1 can adjust the position of the stator S (the position of the axis Ss of the stator S with respect to the axis Rs of the rotor R that is supported by the transmission case MC) based on the measurement result. It is configured. Further, the measurement adjustment device 1 is configured such that its axis (Z shown in FIG. 4) is determined from both the case side shaft support portion RAS2 and the cover side shaft support portion RAS1.

  4, 6, 7, and 8, the measurement adjustment device 1 fixes the pair of upper and lower end face plates 2 in FIG. 4 with the sensor bars 3 provided at four locations in the axial circumferential direction D <b> 3. It has a connected configuration. Between the pair of upper and lower end face plates 2, four stator position adjusting mechanisms 4 are evenly spanned between the sensor bars 3. The stator position adjustment mechanism 4 includes an eccentric cam 6 on a cam shaft 5 disposed in the axial direction D1.

  Of the upper and lower end surface plates 2, the lower end surface plate 2d is generally configured as a ring-shaped end surface plate 2d having a ring shape. Server 3 is fixedly connected. Each of the sensor bars 3 is strictly positioned using a pair of pins 7 on the ring-shaped end face plate 2d. A guide shaft 8 is fixed at the center of the end surface opposite to the end surface to which the sensor bar 3 is fixedly connected.

  As shown in FIG. 4, the guide shaft 8 includes a connecting portion 8a connected to the ring-shaped end face plate 2d on the upper end side, and a shaft bearing that constitutes the case side shaft supporting portion RAS2 described above at the outer peripheral portion thereof. A fitting portion 8b that fits into the BRG 2 is provided. On the other hand, a first center shaft entry hole 8c into which the first center shaft 9a is inserted is provided at the center on the lower end side. The first center shaft 9a is a guide member provided in the working device 10 used when the stator S is fixed to the transmission case MC. The first center shaft 9a has an origin determined on a plane orthogonal to the axis Z shown in FIG. It is provided so as to be movable in a direction along the axis Z which is the direction D1. In the fixing operation, the first center shaft 9a and a second center shaft 9b described later are disposed at the position of the rotation axis Zr of the rotor R that is a virtual reference in the operation.

  The ring-shaped end plate 2d is provided with a connection support portion including a support bearing 11 that rotatably supports the camshaft 5 at four locations in the axial circumferential direction D3. As the support bearing 11, a bearing capable of receiving a thrust to receive a load in the axial direction D <b> 1 from the cam shaft 5 is employed.

  Of the upper and lower end face plates 2, the upper end face plate 2 u is composed of a square plate 12 having a substantially rectangular shape and a connecting plate 13 having a substantially ring shape in a plan view shown in FIG. 5. The rectangular plate 12 and the connecting plate 13 are connected by bolts so that a unitary structure is adopted.

  The other ends of the four sensor bars 3 described above are fixedly connected to the vicinity of the outer periphery of the connecting plate 13. Also in this connection part, each of the sensor bars 3 is strictly positioned using a pair of pins 7. The rectangular plate 12 is positioned on the end surface opposite to the end surface to which the sensor bar 3 is fixedly connected. As shown in FIG. 4, a transport handle 14 is fixed to the rectangular plate 12.

  The transport handle 14 is bolted to the rectangular plate 12 at the end surface opposite to the sensor bar 3 and has a center shaft through hole 14a into which the second center shaft 9b is inserted. The second center shaft 9b is used for conveyance of the measurement adjustment device 1, and is used together with the first center shaft 9a for reference positioning for fixing work.

  The connection plate 13 is provided with connection support portions 15 that rotatably support the camshaft 5 at four locations in the axial circumferential direction D3. The connection support portion 15 includes a pair of radial bearings 16 so that the cam shaft 5 can be properly centered in the axial direction D1, and a stud bolt 17 for appropriately stopping the rotation of the cam shaft 5. Is also provided.

  Pin engaging members 18 for positioning the rectangular plate 12 are connected to each other in the vicinity of the longitudinal end of the rectangular plate 12 using a knock pin np provided in the end opening MCO of the mission case MC. Yes. As can be seen from FIG. 5, the pin engaging member 18 is fixed to each of the longitudinal ends of the rectangular plate 12 by a pair of bolts 19, and the knock pin np enters each pin engaging member 18. Positioning hole 18a. As shown in FIG. 4, the pin engaging member 18 is placed on the end surface constituting the end opening MCO of the mission case MC with the knock pin np entering the positioning hole 18a.

In the measuring and adjusting apparatus 1, the guide shaft 8 enters the shaft support bearing BRG2 provided in the case side shaft support portion RAS2, and the positioning hole 18a of the pin engaging member 18 provided at the longitudinal end of the rectangular plate 12 is used. By causing the knock pin np to enter, the device 1 can be positioned in the axial direction D1, the axial radial direction D2, and the axial circumferential direction D3 with respect to the mission case MC.
That is, the device 1 is positioned in the axial diameter direction D2 by the case side shaft support portion RAS2, and is positioned in the axial direction D1 and the axial circumferential direction D3 by the knock pin np and the positioning hole 18a.

Further, in the axial circumferential direction D3, by the relative position of the knock pin np and the positioning hole 18a with respect to the fastening bolt b1, the measurement adjusting device 1 positioned on the transmission case MC by the knock pin np and the positioning hole 18 and the fastening bolt b1. A relative position with respect to the stator S fastened and fixed to the mission case MC is determined. As shown in FIG. 6, the relative position in the axial circumferential direction D <b> 3 is such that the sensor tip 20 a of the displacement sensor 20 supported by the apparatus 1 and the inner diameter side end surface t <b> 1 of the tooth t provided in the stator S. These are set so as to face each other with their centers substantially coincident. Therefore, the displacement sensor 20 can accurately measure the gap between the sensor tip 20a and the inner diameter side end face t1.
As positioning means for positioning the device 1 on the mission case MC, other means such as bolts and bolt holes may be employed instead of the knock pin np and the positioning hole 18a.

Measurement and Adjustment of Stator Position While the positioning configuration of the stator position measurement and adjustment apparatus 1 has been described above, measurement of the position of the stator S and adjustment of the position will be described below.
As shown in FIGS. 4, 6, 7, and 8, the displacement sensor 20 measures the position of the inner diameter surface of the stator core SC constituting the stator S with respect to the axis of the rotor R by the sensor bar 3 as a support. More specifically, five displacement sensors 20 are provided on the sensor bars 3 that are equally provided at four locations in the axial circumferential direction D3.

  As the displacement sensor 20, an eddy current type displacement sensor for the conductor is adopted by a change in eddy current in the conductor due to electromagnetic induction. These five displacement sensors 20 have an inner diameter that is the tip surface of the sensor tip 20a and the tooth t substantially equally with respect to the width in the axial direction D1 of the stator core SC shown in FIG. It is appropriately arranged so as to measure the gap with the side end face t1. Thereby, the position of the axial direction D1 of the stator S with respect to the shaft center of the rotor R can be known. This displacement sensor 20 forms a measuring means.

Therefore, the state of the position of each part along the axial direction D1 of the stator S can be known by the five displacement sensors 20 arranged on each sensor bar 3.
Further, since the displacement sensor 20 is a non-contact type displacement sensor that selectively reacts to a magnetic material or a conductor like the eddy current type displacement sensor, the displacement sensor 20 is disposed between the displacement sensor 20 and the stator core SC. The position of the inner diameter side end face t1 of the stator core SC can be accurately measured by eliminating the influence of a substance other than the magnetic substance and the conductor interposed between the varnish, particularly the varnish adhering to the radial surface of the stator core SC.
On the other hand, since the sensor bar 3 is equally provided at four locations in the axial circumferential direction D3 as described above, the position of each part along the axial circumferential direction D3 of the stator S can also be known. From the outputs of the four displacement sensors 20 in the direction D3, the center position of the stator S can be known. The position of the axis of the stator S (average axis Ss shown in FIG. 3B) can be obtained as the average value of the center positions of the stator S at each position in the axial direction D1.
That is, in the measurement adjustment apparatus 1 according to the present application, a measuring unit is configured by a pair of end surface plates 2 connected by the sensor bar 3, members attached to the end surface plates 2, and the displacement sensor 20. Further, a mechanism for positioning and supporting the displacement sensor 20 with respect to the rotor shaft support portion RAS, specifically, a pair of end face plates 2, a sensor bar 3, a guide shaft 8, and a pin engaging member. A support is constituted by 18 and the like.

  As a result, in the measurement adjustment apparatus 1, since the axis Z of the measurement adjustment apparatus 1 can be made to coincide with the axis Zr position of the virtual rotor R, the output from the displacement sensor 20 is obtained as described above. Thus, the position of the stator S (position of the stator core SC) with respect to the axis of the rotor R can be determined precisely.

  As shown in FIGS. 4, 6, 7, and 8, the cam shafts 5 that are equally provided at the four locations in the axial circumferential direction D <b> 3 are each provided with an eccentric cam 6. Here, the eccentric cam 6 includes a cam surface 6s that is eccentric with respect to the axis 5z of the cam shaft 5, as shown in FIG. Therefore, as the cam shaft 5 rotates, the cam surface 6s can be taken from a position close to the cam shaft axis 5z to a position away from the cam shaft 5z. As can be seen from FIGS. 4 and 6, the cam surface 6s is disposed in the vicinity of the separated position so as to contact the inner peripheral surface of the stator core SC, so that the inner peripheral surface ( It is possible to move the stator S in the axial diameter direction D2 by pressing the inner diameter side end face t1) of the tooth t.

The above is the description regarding the adjustment in the axial direction D2, but in the measurement adjusting device 1, a unique device is also provided at the position where the cam 6 is disposed.
As shown in FIGS. 4 and 7, the cam 6 is disposed at a position corresponding to the lower end portion of the stator core SC in the axial direction D1. This position is a position where the stator core SC contacts the seating surface MC1 in a state where the stator core SC is inserted into the mission case MC. Specifically, in this example, the cam 6 is positioned such that the lower end surface (bottom surface) of the cam 6 is positioned substantially on the same surface as the seat surface MC1 of the transmission case MC that supports the lower end surface of the stator core SC (stator S). 6 is arranged.
As will be described later, the adjustment of the stator position using the measurement adjustment device 1 is performed in a vertical posture in which the opening MCO of the mission case MC is opened upward. In this situation, the load of the stator S is applied to the steel plate p constituting the stator core in the vicinity of the seating surface MC1, and it is most preferable to adjust the position of the steel plate p in this portion. In the study by the inventors, when the vertical position (axial direction D1) upper side portion of the stator core SC is pushed by the cam 6 in a state where the vertical posture is maintained in the adjustment, the stator S itself is axially entirely. The steel plate p that is in contact with the seating surface MC1 is not easily moved simply by tilting with respect to D1, and after adjustment with the eccentric cam 6, it may return to its original state and become poorly adjusted.
Therefore, in the measurement adjustment apparatus 1, by setting the cam position near the lower end of the stator core SC as described above, the eccentric cam 6 that is evenly arranged in the axial circumferential direction D3 is used, and the axial circumferential direction D3. It is possible to appropriately adjust the position of the stator S in the axial diameter direction D2 in each part.
In the measurement adjustment apparatus 1 according to the present application, an adjustment means is configured by a pair of end face plates 2 connected by the sensor bar 3, members attached to the end face plates 2, and the stator position adjustment mechanism 4. Further, the stator position adjusting mechanism 4 constitutes an adjusting tool which is an adjusting means, and the cam shaft 5 constitutes a rotating shaft thereof.

Adjustment of Stator Position A series of operations for fixing the stator S to the transmission case MC by measuring the position of the stator S using the measurement adjusting device 1 and adjusting based on the measurement result will be described below.

This series of operations includes a vertical arrangement process in which the mission case MC is arranged in a vertical position on the work device 10, an insertion process in which the stator S is inserted into the mission case MC, and a temporary fixing in which the stator S is temporarily fixed in the mission case MC. A process, an arrangement process for disposing the measurement adjusting device 1 in the stator S, a measurement process for measuring the stator position, an adjustment amount deriving process for deriving the adjustment amount of the stator S based on the measurement result, and a release for releasing the temporary fixing A process, an adjustment process for adjusting the stator position in a state where there is no fastening force, and a fixing process for fastening and fixing the stator S to the transmission case MC are performed.
Hereinafter, it demonstrates in order.
1 Vertical Arrangement Step This is a step of arranging the mission case MC in a vertical posture on the work apparatus 10. That is, as shown in FIG. 9, the mission case MC is arranged so that the end opening MCO of the mission case MC is on the upper side and the case side shaft support portion RAS2 provided on the mission case MC is on the lower side. . Of course, the axis Z of the first and second center shafts 9a, 9b provided in the work device 10 and the axis Zr of the virtual rotor R determined in the mission case MC are made to coincide. Here, this working device 10 constitutes a posture holding tool.

  At this time, the shaft case bearing BRG2 constituting the case side shaft support portion RAS2 is won in the transmission case MC, and the knock pin np is driven into a predetermined portion of the end surface opening MCO. The position of the stator S is determined by pulling the measurement adjusting device 1 using these two types of members BRG2, np.

2 Insertion Step As shown in FIG. 9, the stator S is inserted into the mission case MC in a vertical posture. This insertion operation is performed in a state where the stator S is dropped into the mission case MC, and the stator S is supported from a seating surface MC1 provided in the mission case MC. When the insertion is completed, the stator S has its vertical position (axial position D1 position) determined, and the relative phase (axial circumferential direction D3 position) relationship between the transmission case MC and the stator S is substantially determined. On the other hand, as described above, a slight backlash is allowed in the horizontal direction (axial radial direction D2 position).

3 Temporary Fastening Step As shown in FIG. 9, the fastening bolt b <b> 1 is used to temporarily secure the stator S in a tightened state where the stator S is fastened to the transmission case MC. The fastening force at this time is almost the same as the fastening force when the stator S is fixed to the transmission case MC. By performing such a fastening operation, the stator core SC may be deformed as shown in FIG. 3B according to individual habits.

4. Arrangement Step As shown in FIG. 10, the measurement adjustment device 1 is arranged in the mission case MC in which the stator S is in the tightened state. This arrangement is performed in a state where the first center shaft 9a is inserted into the guide shaft 8 while the measurement adjustment device 1 is suspended by the transport unit 14a using the second center shaft 9b.
During the lowering operation, the fitting portion 8b of the guide shaft 8 positioned on the lower side is guided and centered by the shaft support bearing BRG2 constituting the case side shaft support portion RAS2. On the other hand, the pin engaging members 18 provided at both end portions of the rectangular plate 12 positioned on the upper side are positioned by the knock pins np.
In this structure, the pivot bearing BRG2 serves for centering, and the knock pin np serves for centering. Furthermore, the entire apparatus 1 is supported from below by the end face opening MCO.

5. Measurement Step As shown in FIG. 11, the position of the inner diameter side end surface t1 of the tooth t provided in the stator core SC using the displacement sensor 20 with the measurement adjusting device 1 disposed in the mission case MC. Is measured as the output of each displacement sensor 20.
A computer (not shown) configured to obtain the position of the stator S based on the output of the displacement sensor 20 collects the output of the displacement sensor 20 for each of the displacement sensors 20 at different positions in the vertical direction. The center position of the stator S at the vertical position (axial position D1) is obtained as the deformed state of the inner diameter surface of the stator S in the tightened state. As a result, as shown in FIG. 3B, from the seating surface MC1 side to the representative position of the stator S and the vicinity of the upper end, the circular center positions at the respective heights are individually orthogonal to the axial direction D1. It is obtained as coordinates on the plane. Here, the computer that performs this arithmetic processing constitutes the stator position deriving means. The representative position of the stator S indicates the position of the axis of the stator S obtained as an average value of the center positions of the stator S at each position in the axial direction D1.
In this measurement process, when the axial center positions of the rotor R and the stator S coincide with each other, the measurement adjustment device 1 is detached from the transmission case MC and the rotor R is assembled without performing the adjustment process described later. The motor driving device M can be completed.

6 Release Process As shown in FIG. 12, the fastening state of the stator S in the tightened state by the fastening bolt b1 is released, and an open state in which the fastening force does not work is set.

7 Adjustment Amount Deriving Step The adjustment of the position of the stator S is performed as follows. As shown in FIG. 3D, in the tightened state of the stator S, the average axis Ss that is the average value of the circular center positions at each height of the stator S Then, it is performed so as to be within a predetermined range with respect to the axis Rs of the rotor R that is virtually set. Therefore, the average value of the circle center positions at the respective vertical positions obtained by the computer is calculated to obtain the average axis Ss of the stator S. Then, the lowermost circle center position (Sb shown in FIG. 3D) that is in contact with the appropriate seating surface to keep the average axis Ss within the target range is obtained as the target adjustment position. The position where the lowermost center position Sb of the stator S abuts against the seat surface MC1 of the transmission case MC does not change depending on whether the stator S is in the tightened state or the released state. The target adjustment position when the stator S is not fastened. The relationship between the lowermost center position Sb and the axis Rs of the rotor R is shown in FIG. This target adjustment position is obtained as the position of the stator when the average axis Ss of the inner diameter surface of the stator S coincides with the axis Rs of the rotor R at the representative position of the stator S along the axial direction of the rotor R. Will be.

The lowermost center position Sb, which is the target adjustment position of the stator S, can be derived based on the eccentricity information of the shaft center Ss of the stator S in the tightened state with respect to the shaft center Rs of the rotor R.
That is, in the measurement step described above, the eccentric direction and the eccentric distance a of the axis Ss of the stator S that is in a tightened state as shown in FIG. Ask. Then, based on the shaft center Sso of the stator S before being adjusted in the release step described above as a reference, the eccentric direction obtained as the eccentric state is shifted by the eccentric distance a obtained in the direction opposite to the eccentric direction obtained as the eccentric information. The position is derived as the lowermost center position Sb that is the target adjustment position of the stator S. Therefore, with respect to the stator S in which the circular center position Sb derived in this way is the lowermost position, the shaft center Ss coincides with the shaft center Rs of the rotor R in the tightened state. In this case, an operation for shifting the stator S from the current position in the direction opposite to the eccentric direction by the eccentric distance a may be performed.

The lowermost center position Sb, which is the target adjustment position of the stator S, is the axis Ss of the stator S in the tightened state with respect to the shaft center Sso of the stator S in the opened state, in addition to the eccentricity information as described above. It can also be derived based on the movement information.
That is, in the measurement step described above, after measuring the shaft center Ss of the stator S in the tightened state as shown in FIG. 3B, the shaft center Sso of the stator S before being adjusted by being released in the release step described above. Measure. With respect to the shaft center Sso of the stator S in the opened state, the movement direction and the movement distance b of the shaft center Ss of the stator S in the tightened state are obtained as movement information as shown in FIG. Then, a position shifted by the movement distance b obtained as the movement state in the direction opposite to the movement direction obtained as the movement information on the basis of the axis Rs of the rotor R is set as a target adjustment position of the stator S. It is derived as the lowermost circle center position Sb. Therefore, with respect to the stator S in which the circular center position Sb derived in this way is the lowermost position, the shaft center Ss coincides with the shaft center Rs of the rotor R in the tightened state. Since the measurement of the axis Ss of the stator S in the open state is performed after the measurement of the axis Ss of the stator S in the tightened state, the axis Ss of the stator S in the tightened state is already the axis of the rotor R. When it matches Rs, the measurement of the axis Rs of the stator S in the opened state can be omitted, and the working time can be shortened. In this case, an operation of shifting the stator S in the direction opposite to the moving direction by the moving distance b on the basis of the rotor shaft center Rs may be performed.

8 Adjustment Step As shown in FIG. 12, by appropriately rotating the camshaft 5 to adjust the position of the lower part of the stator S to the appropriate lowermost circle center position Sb obtained as described above. The stator S is moved and adjusted. The movement adjustment of the stator S is performed by rotating the cam shaft 5 and pressing a part of the axial circumferential direction D3 on the inner circumferential surface of the stator core SC radially outward by the cam surface 6s of the eccentric cam 6. At this time, since the eccentric cam 6 is disposed at a position corresponding to the lower end portion of the stator core SC, the lowermost circular center position of the stator S is suitably moved and adjusted.
By doing so, the stator S is set to a position where the average axis Ss of the representative position is within the allowable range in the tightened state of the fastening bolt b1.

9 Fixing Step After the adjustment step, as shown in FIG. 13, the stator S is fastened and fixed to the transmission case MC again using the fastening bolt b1. Through the above measurement process and adjustment process, even in the motor drive device M that uses the laminated stator core SC that may be deformed in the fastened state, the centering can be performed with very high accuracy. . Finally, FIG. 3D shows a state where the axes of the rotor R and the stator S coincide with each other at the representative position m.

10 Shaft support process If the shaft center Rs of the rotor R and the shaft center Ss of the stator S coincide with each other, the measurement adjustment device 1 is removed from the transmission case MC, the rotor R is assembled, and the motor drive device M is Complete.
If it can be confirmed that the axis Rs of the rotor R and the axis Ss of the stator S coincide with each other by performing the above measurement process, the measurement adjustment device 1 is detached from the transmission case MC, the rotor R is assembled, and the motor The driving device M can be completed.

(Another embodiment)
(1) In the above embodiment, the measurement adjustment device is centered using both the shaft support bearing provided in the case side shaft support portion and the knock pin provided in the end opening. When the work is performed while supporting the measurement adjustment device in the vertical direction in the vertical orientation as described above, and the axis of the measurement adjustment device is to be aligned with the axis of the rotor, the position in the axial diameter direction is substantially Since it can be determined in any one of the vertical directions, it is possible to use one of the shaft support bearing provided in the case side shaft support portion and the knock pin provided in the end opening as a reference.

(2) Further, even in the configuration in which the case side shaft support portion and the cover side shaft support portion are provided, as shown in the above embodiment, the case side shaft support portion is provided between the motor drive device chamber and the transmission mechanism chamber. In addition to providing a cover-side shaft support portion between the engine chamber and the motor drive device chamber, a cover-side shaft support portion is provided between the motor drive device chamber and the transmission mechanism chamber, and a case is provided between the engine chamber and the motor drive device chamber. It is good also as a structure which provides a side axis | shaft support part.
In the examples described so far, one shaft support portion is provided on the case side and the other shaft support portion is provided on the cover side. However, a pair of partition covers that divide the motor drive device chamber are provided, and both partition covers are provided. However, it is good also as a structure which provides a pair of shaft support part as what hold | maintains a shaft support bearing. Therefore, in the present application, a shaft support portion having a shaft support bearing held by a specific partition cover is referred to as a first shaft support portion, and is opposed to the first shaft support portion with the rotor body interposed therebetween. The shaft support portion located on the side is referred to as a second shaft support portion.

(3) In the above-described embodiment, four stator inner diameter surface portions arranged in the axial circumferential direction D3 are targets for measurement and adjustment. However, the number of measurement and adjustment portions is not limited to this. If at least three places are measured and adjusted in the axial direction, measurement and adjustment are possible. However, the more the number of measurement and adjustment points, the more accurate measurement and adjustment of the axial position of the stator S becomes possible. Further, if there are four places, there is an advantage that the coordinates of the axial center position on the orthogonal coordinates can be directly measured and adjusted.
Moreover, in the said embodiment, although the number of measurement locations and the number of adjustment locations were made the same, it does not matter even if it makes a different number.
Furthermore, regarding the phase in the axial circumferential direction D3, the phase of the stator inner diameter surface portion to be measured may coincide with the phase of the stator inner diameter surface portion to be adjusted. In this case, for the reason of adjusting the stator core satisfactorily, the current position of the eccentric cam in the axial direction (position where the steel plate contacting the seat surface can be adjusted in the axial radial direction) is maintained, and For measurement and adjustment, it is preferable to perform measurement by attaching a displacement sensor to the upper portion. When this configuration is adopted, it is easy to derive the adjustment amount.
Further, in the above-described embodiment, the five locations arranged at equal intervals in the axial direction D1 of the inner diameter surface of the stator S are the measurement locations by the displacement sensor 20, but the number of measurement locations is limited to this. First, if at least two locations located on both ends of the stator S in the axial direction D1 are taken as measurement locations, the approximate arrangement state of the stator S along the axial direction D1 can be measured. However, the more the number of measurement points, the more detailed measurement of the arrangement state of the stator S becomes possible.

(4) In the above embodiment, an eddy current type displacement sensor is employed as a non-contact type displacement sensor that is selectively responsive to a magnetic material or a conductor. As such a displacement sensor, a magnetic material by magnetic induction is used. Another type of displacement sensor such as a magnetic displacement sensor that detects the distance to the magnetic body by a change in the magnetic field in the vicinity may be employed.
Furthermore, any sensor can be employed as long as the position of the inner peripheral surface of the stator core can be detected.

(5) In the above embodiment, the position of the stator inner diameter surface is adjusted by using the eccentric cam, but the adjustment portion has a center on the axis of the rotor and can be operated to increase or decrease the diameter. You may comprise the adjustment mechanism provided with.

(6) In the above embodiment, the displacement sensor is arranged to measure the position of the inner diameter surface of the stator core, that is, the position of the inner diameter side end surface that is the tip surface of the teeth. A displacement sensor may be arranged so as to measure the position of the radial surface, and the position of the stator core may be obtained based on the output of the displacement sensor.

(7) In the above embodiment, after the temporary fixing step of temporarily fixing the stator S in the transmission case MC, the arrangement step of arranging the measurement adjusting device 1 in the stator S is performed. The reverse is also acceptable.

(8) In the above embodiment, the cam 6 is disposed at a position corresponding to the lower end portion of the stator core SC, that is, a position in the vicinity of the position in contact with the seating surface MC1 of the stator core SC. The arrangement position is not limited to this. That is, the cam 6 may be disposed at any position where the position of the stator S can be appropriately adjusted, and the cam 6 is disposed so as to move a portion below the middle in the vertical direction of the stator S. It is also one of the preferred embodiments.

  A stator position measuring method and a stator position measuring apparatus according to the present invention are provided, for example, in a motor drive device provided in a hybrid vehicle, in order to accurately and quickly adjust the positioning of the stator, the position of the stator core with respect to the rotor axis. The present invention can be effectively used as a stator position measuring method and a stator position measuring apparatus that can accurately measure the stator position.

The figure which shows the cross-section of a motor drive unit chamber The figure which shows the assembly structure of each part which comprises a motor drive device. Explanatory drawing which shows the deformation | transformation state of the stator core accompanying fastening Longitudinal section of the measuring and adjusting device in use Plan view of the measurement adjustment device in use Sectional drawing of the AA cross section in FIG. Perspective view of measurement adjustment device Exploded view of measurement adjustment device Explanatory drawing of the process of fixing the stator to the mission case Explanatory drawing of the process of fixing the stator to the mission case Explanatory drawing of the process of fixing the stator to the mission case Explanatory drawing of the process of fixing the stator to the mission case Explanatory drawing of the process of fixing the stator to the mission case

Explanation of symbols

1 Measurement adjustment device (stator position measurement device)
2 End plate 3 Sensor bar (support)
4 Stator Position Adjustment Mechanism 5 Cam Shaft 6 Eccentric Cam 7 Pin 8 Guide Shaft 9 Center Shaft 10 Working Device 12 Square Plate 13 Connecting Plate 14 Carrying Handle 18 Pin Engaging Member 20 Displacement Sensor BRG Shaft Support Bearing E Engine M Motor Drive Device MC transmission case (motor case)
np Knock pin p Steel plate R Rotor RAS Shaft support S Stator SC Stator core SW Stator coil T Transmission mechanism t Teeth

Claims (9)

The present invention relates to a motor case including a motor case, a rotor pivotally supported by the motor case and rotating inside, and a stator disposed concentrically with the rotor on the outer periphery of the rotor, and the position of the stator with respect to the rotor axis A measuring device for measuring
The rotor which is a pair of pivot bearings which house the stator in the motor case and are supported by the motor case and determine the axis of the rotor when the rotor is not inserted into the stator. A support body that is positioned and supported with respect to the shaft support portion of
At least three displacement sensors capable of measuring the radial position of the inner diameter surface of the stator are disposed on the support at at least three locations in the axial circumferential direction of the rotor ;
A stator position measuring device comprising stator position deriving means for obtaining a position of the stator with respect to an axis of the rotor based on an output of the displacement sensor. The displacement sensor is mounted on the support so as to measure the radial position of the inner diameter surface of the stator at at least two positions located at both ends of the stator in the axial direction of the rotor in at least three positions in the axial circumferential direction of the rotor. measuring apparatus of the stator position according to the arrangement claims 1. The motor case includes a motor case main body in which the stator and the rotor are housed, and a partition cover that covers one end opening in the axial direction of the rotor of the motor case main body,
As the shaft support portion of the rotor, a first shaft support portion positioned on the partition cover side and a second shaft support portion positioned on the opposite side of the rotor main body with respect to the first shaft support portion are provided.
The second shaft support portion includes a shaft support bearing held by the motor case body,
The first shaft support portion is configured to include a shaft support held by the partition cover, and a positioning mechanism for positioning the partition cover with respect to the motor case body is provided.
The displacement sensor is positioned with reference to both the first shaft support and the second shaft support ,
In order to position the displacement sensor with respect to the second shaft support portion, at least the positioning with respect to the inner diameter surface of the shaft support bearing,
The stator position measuring device according to claim 1 or 2 , wherein the displacement sensor is positioned with reference to the first shaft support portion, and is positioned with reference to the positioning mechanism . As the support,
A plurality of sensor bars arranged along the axial direction of the stator to which the displacement sensors are attached;
A first end face plate on which one end of the sensor bar is positioned and fixed;
A second end face plate on which the other end of the sensor bar is positioned and fixed;
A guide shaft having a fitting portion that is fixed to a surface of the first end surface plate opposite to a surface to which the sensor bar is fixed, and that is fitted into the shaft bearing provided in the second shaft supporting portion; Prepared,
The stator position measuring device according to claim 3, wherein the second end face plate is positioned with reference to the positioning mechanism. The stator position measuring device according to claim 3 or 4, wherein the positioning mechanism is a knock pin and a positioning hole. The stator position measuring device according to any one of claims 1 to 5, wherein the displacement sensor is a non-contact sensor that selectively senses a magnetic material or a conductor. The present invention relates to a motor case including a motor case, a rotor pivotally supported by the motor case and rotating inside, and a stator disposed concentrically with the rotor on the outer periphery of the rotor. A measuring method for measuring
The stator is housed in the motor case, and the rotor is not inserted into the stator in an uninserted state,
A pair of shaft bearings that are supported by the motor case and determine the axis of the rotor are shaft support portions of the rotor, and at least three displacements arranged on a support body that is positioned and supported with respect to the shaft support portion of the rotor. the sensor, and measure the radial position of the inner surface of the stator at least three places in the axial circumferential direction of the rotor,
A stator position measuring method for obtaining a position of the stator with respect to an axis of the rotor based on an output of the displacement sensor. The stator position measurement according to claim 7 , wherein the radial position of the inner diameter surface of the stator is measured at at least two positions located on both ends of the stator in the axial direction of the rotor in at least three positions in the axial circumferential direction of the rotor. Method. The motor case includes a motor case main body in which the stator and the rotor are housed, and a partition cover that covers one end opening in the axial direction of the rotor of the motor case main body,
As the shaft support portion of the rotor, a first shaft support portion positioned on the partition cover side and a second shaft support portion positioned on the opposite side of the rotor main body with respect to the first shaft support portion are provided.
The second shaft support portion includes a shaft support bearing held by the motor case body,
The first shaft support portion is configured to include a shaft support held by the partition cover, and a positioning mechanism for positioning the partition cover with respect to the motor case body is provided.
The displacement sensor is positioned with reference to both the first shaft support and the second shaft support ,
In order to position the displacement sensor with respect to the second shaft support portion, at least the positioning with respect to the inner diameter surface of the shaft support bearing,
The stator position measuring method according to claim 7 or 8 , wherein the displacement sensor is positioned with reference to the first shaft support portion, and is positioned with reference to the positioning mechanism .

Images