JP5105150B2 - Motor drive device and method of manufacturing motor drive device - Google Patents

Description

  The present invention relates to a motor drive device including a motor case, a stator housed in the motor case, and a rotor that is pivotally supported from the motor case and rotates inside the stator, and a method of manufacturing the motor drive device. .

  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.

  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.

In this type of vehicle motor drive device, the stator may vibrate for some reason. As such factors, for example, the stator may resonate due to the effect of the rotation of the rotor, or the vibration generated in the transmission may be transmitted to the stator via the motor case to cause the stator to resonate.
Therefore, in order to improve the quietness in the passenger compartment and reduce the noise outside the vehicle, it is particularly required to suppress noise caused by the vibration of the stator.

In this type of motor drive device, Patent Document 1 discloses the following as a technique for reducing noise caused by the vibration of the stator.
That is, in this motor drive device, convex portions projecting radially inward from the inner peripheral surface are formed at a pitch of approximately 90 ° at four locations in the circumferential direction of the inner peripheral surface of the motor case. Then, a stator is press-fitted into the inner peripheral side of the four convex portions, and a fastening bolt is fastened at a position in the same phase as the four convex portions in the vicinity of the opening on one end side in the axial direction of the motor case. The end of the stator is pressed by the head (or the washer provided on the bolt) to prevent the stator from coming off in the radial direction.
With the above-described configuration, the stator abuts on the four convex portions in the motor case, the radial position thereof is fixed, and the axial position is fixed by the fastening bolt. Further, in a region other than the convex portion, a gap is formed between the inner peripheral surface of the motor case and the outer peripheral surface of the stator.

  As described above, since the convex portion comes into contact with the outer peripheral surface of the stator, the region of the outer peripheral surface of the stator where the convex portion comes into contact becomes a node of vibration, and the amount of displacement during vibration is reduced. In other words, a region of the outer peripheral surface of the stator where the amount of displacement during vibration is small contacts the inner peripheral surface of the motor case. As a result, vibration transmitted from the stator to the motor case becomes relatively small, and noise from the motor drive device can be suppressed.

Japanese Patent Laid-Open No. 2002-233103

By the way, the magnitude, frequency, and the like of the noise described above vary depending on the relative positional relationship between the shape of the stator and the motor case, the size of the gap between the transmission case and the outer peripheral surface of the stator, and the contact state between the two.
On the other hand, in this type of motor drive device, when a plurality of individual units are manufactured, it is not preferable that there are variations in how noise is generated among the individual units.

However, in the conventional motor driving device described above, the stator is press-fitted into the motor case as described above. That is, the stator is inserted in a state where the inner peripheral surface (four convex portions) of the motor case set to have a smaller diameter than the outer peripheral surface of the stator is larger than the outer diameter of the stator, and the convex portion is the outer periphery of the stator. The stator is held in the motor case by being pressed against the surface.
Therefore, after press-fitting the stator into the motor case, it is difficult to adjust the relative positional relationship between the stator and the motor case to an intended position. Further, the stator may be deformed by the pressure contact force of the convex portion against the outer peripheral surface of the stator. For this reason, when manufacturing a plurality of motor drive devices, the shape of the stator and the relative positional relationship between the stator and the motor case cannot be kept constant between the individual units, and noise is generated between the individual units. There was a problem that variations were likely to occur.
Further, as described above, since it is necessary to press-fit the stator into the motor case and it is difficult to adjust the position of the stator after the press-fitting, it is difficult to manufacture the motor driving device itself.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a motor driving device capable of making the degree of noise between individual individuals constant while taking a configuration that is easy to manufacture. And providing a method of manufacturing the motor drive device.

The motor drive device according to the present invention includes a motor case, a stator housed in the motor case, and a rotor that is pivotally supported from the motor case and rotates inside the stator. with a gap is provided between the inner peripheral surface and the outer peripheral surface of the stator, the contacted portion of the contact portion is provided on the inner circumferential surface of the motor case provided on an outer peripheral surface of the stator The stator is fixed to the motor case in a state in which the stator is pressed against one inner side in the radial direction against the inner peripheral surface of the motor case so as to come into contact with the motor. A fastening portion fastened to the case and fixed in the axial direction, and the abutted portion is formed to protrude from an inner peripheral surface of the motor case;
The contact portion is set on an outer peripheral surface of the stator in the vicinity of a fastening portion by the fastening means .

With this arrangement, since the possible contacts the contacted portion of the contact portion is provided on the inner peripheral surface of the always motor case provided on an outer peripheral surface of the stator, of the outer peripheral surface of the motor casing of the stator The contact portion between the peripheral surface and the peripheral surface can be the same among a plurality of individual motor drive devices.
In addition, since there is a gap between the outer peripheral surface of the motor case and the inner peripheral surface of the stator, the contact is made with the stator pressed against one side in the radial direction and in contact with the inner peripheral surface of the motor case. Outside the contact point, the outer peripheral surface of the stator and the inner peripheral surface of the motor case can be prevented from contacting each other. Further, since the stator is not pressed against the motor case, the stator is not deformed, and the shape of the stator can be kept constant among a plurality of individuals.
As a result, the contact state between the stator and the motor case and the state of the stator can be made uniform among a plurality of individual motor drive devices. Therefore, the degree of noise among the plurality of individuals can be made constant.

  Further, according to this configuration, the stator can be assembled to the motor case by a simple operation of inserting the stator into the motor case and pressing and fixing it to one radial direction without using press-fitting or the like. . Therefore, it can be easily manufactured as compared with the conventional motor driving device.

In this aspect, the fastening means is disposed at a plurality of locations in the circumferential direction, the stator, it is preferable that is fixed to both the axial and radial direction by the fastening means.

  According to this configuration, the stator can be easily moved in the radial direction in the motor case until it is fastened by the fastening means, so the inner peripheral surface of the motor case is moved to the one side in the radial direction. It becomes easy to abut against and contact. Then, by fastening the fastening means in such a state, the stator can be reliably fixed in both the axial direction and the radial direction in a state where the contact portion of the stator is in contact with the inner peripheral surface of the motor case. it can. As a result, the contact state between the stator and the motor case can be made uniform among a plurality of individual motor drive devices. Therefore, the degree of noise among the plurality of individuals can be made constant.

Incidentally, the abutment portion is in the outer peripheral surface of the stator, the displacement amount when the stator vibrates is set to a small area compared to other areas.

Thus, the contact portion by the stator is set in the area displacement amount when vibration is small compared to other regions, can be relatively small vibration transmitted from the stator to the motor case. As a result, the noise level can be made uniform with a relatively small value.

In the above-described configuration, it is preferable that the contact portion is set at one or two outer peripheral surfaces of the stator.

Meanwhile, the contact portion is in contact with a predetermined abutted portion which is set on the inner circumferential surface of the motor case.

The degree of noise depends on the ease of vibration on the motor case side in addition to the amount of displacement when the stator vibrates. For this reason, depending on the shape of the motor case, the degree of noise may vary depending on which position on the inner peripheral surface of the motor case the contact portion of the stator contacts. Therefore, by abutting the predetermined abutted surface abutting surface of the stator that is set on the inner peripheral surface of the motor Takesu, among a plurality of individuals of the motor driving apparatus, also uniformly state of vibration of the motor case can do. Therefore, the degree of noise among the plurality of individuals can be made constant.

  In the above-described configuration, a retraction portion that is retreated in a radially outer side than the other portion is formed in a partial region in the circumferential direction on the inner peripheral surface of the motor case, and the contacted portion is formed of the retraction portion. It is preferable that it is set at both ends in the circumferential direction.

  According to this configuration, the two contacted portions set at both ends in the circumferential direction of the retraction portion in a state where the contact portion of the outer peripheral surface of the stator is in contact with the contacted portion of the inner peripheral surface of the motor case. Since the outer peripheral surface of the stator between the portions (contact portions) enters the retraction portion, a large amount of movement of the stator with respect to the motor case can be secured, and thus the outer periphery of the stator with the other side in the radial direction as the center. It is possible to ensure a large gap between the surface and the inner peripheral surface of the motor case. Thereby, it can prevent reliably that a stator contacts the inner peripheral surface of a motor case except an contact part. Therefore, the contact state between the stator and the motor case can be made uniform among the plurality of individual motor drive devices, and the degree of noise among the plurality of individual can be made constant.

Incidentally, the abutted portion is that is formed to protrude from the inner circumferential surface of the motor case.

For this reason , since the abutting portion of the stator abuts on the abutted portion formed to protrude from the inner peripheral surface of the motor case, the outer periphery of the stator is also in the vicinity of the abutting portion between the stator and the motor case. A clearance between the surface and the inner peripheral surface of the motor case can be secured. For this reason, it can prevent that the outer peripheral surface of a stator and the inner peripheral surface of a rotor contact | abut in parts other than the set contact part and to-be-contacted part.
As a result, the contact state between the stator and the motor case can be made uniform among a plurality of individual motor drive devices. Therefore, the degree of noise among the plurality of individuals can be made constant.

Further, the contact portion, that is set to the outer peripheral surface of the stator fastening part near by the fastening means.

When the stator is fixed to the motor case by fastening means at a plurality of locations in the circumferential direction, the fixed location becomes a vibration node and the stator vibrates, so the vicinity of the fastening portion is compared with other portions. The amount of displacement during vibration is reduced. For this reason , by setting the contact portion on the outer peripheral surface of the stator in the vicinity of the fastening portion by the fastening means , the contact portion is set in a region where the amount of displacement when the stator vibrates is small compared to other regions. Can do.
In addition, since the position of the fastening portion is apparent at first glance, setting the contact portion in the vicinity of the fastening portion ensures that the contact portion is securely attached to the motor case when the stator is assembled to the motor case. It can be brought into contact with the peripheral surface.

In this aspect, the contact portion can be set in the area between the fastening portion with two of the fastening means adjacent to each other physician. Furthermore, it is preferable that the contact portion is set at a circumferential end portion of the region between the fastening portions by the two fastening means adjacent to each other.

  In the above-described configuration, the stator includes protrusions whose outer peripheral surfaces protrude radially outward at a plurality of locations in the circumferential direction, and each of the protrusions is a fastening portion by the fastening means. Is preferred.

  According to this configuration, even when the insertion hole for inserting the fastening means such as the bolt is provided in the stator, the insertion hole is provided in the protruding portion protruding radially outward from the outer peripheral surface of the stator. Therefore, the influence on the magnetic flux passing through the stator can be reduced. Therefore, by securing the stator in both the axial direction and the radial direction with respect to the motor case by inserting and fastening fastening means such as bolts into the stator, the performance of the stator can be easily secured. Can do.

  In the above-described configuration, it is preferable that the gap between the outer peripheral surface of the stator and the inner peripheral surface of the motor case is set to be smaller than the gap between the stator and the rotor.

  According to this structure, even if it is a case where fixation of the stator to a motor case is cancelled | released during operation | movement of a motor drive device, it can prevent that a stator and a rotor contact | connect. That is, according to this configuration, even when the stator is released, the stator can move only within the range of the gap between the outer peripheral surface of the stator and the inner peripheral surface of the motor case. Therefore, the range in which the stator can move within the motor case is restricted to a range that does not contact the rotor. As a result, even if the fixing of the stator to the motor case is released during the operation of the motor driving device, the motor driving device can be prevented from being damaged.

A characteristic configuration relating to a method of manufacturing a motor drive device according to the present invention includes a motor case, a stator that is housed in the motor case with a gap between the inner peripheral surface of the motor case, and the motor case A rotor that is pivotally supported from the stator and rotates inside the stator, and the stator is fastened to the motor case by fastening means and has a fastening portion that is fixed in the axial direction. In the method, the stator is accommodated in the motor case, and a contact portion provided on the outer peripheral surface of the stator in the vicinity of the fastening portion by the fastening means is formed to protrude from the inner peripheral surface of the motor case . to abut the abutted portion, the the pressing step of the inner circumferential surface of the motor case pressed against the stator radially one side, the abutment portion said motor case The inner peripheral surface while abutting lies in executing and a stator fixing step of fixing the stator to the motor case.

  According to this configuration, the stator is moved to the motor case in a state in which the stator is pressed against the inner peripheral surface of the motor case on one side in the radial direction and the contact portion is in contact with the inner peripheral surface of the motor case. And a stator fixing step of fixing to the stator. For this reason, the contact location with respect to the internal peripheral surface of the motor case of the outer peripheral surface of a stator can be made constant. As a result, the contact state between the stator and the motor case can be made uniform among a plurality of individual motor drive devices. Therefore, the motor drive device can be manufactured so that the degree of noise between the plurality of individuals is constant.

  Further, according to this configuration, the stator can be assembled to the motor case by a simple operation of inserting the stator into the motor case and pressing and fixing it to one radial direction without using press-fitting or the like. . Therefore, the motor drive device can be easily manufactured as compared with the conventional one.

  In the pressing step, in a state where the rotor is not accommodated in the stator, the stator is moved to one side in the radial direction by the predetermined stator position adjusting means inserted into the stator, and the motor case It is preferable to press against the inner peripheral surface.

  According to this configuration, the stator can be easily and surely moved to one side in the radial direction and pressed against the inner peripheral surface of the motor case by the stator position adjusting means inserted into the stator before inserting the rotor. Therefore, the contact state between the stator and the motor case can be made uniform among a plurality of motor drive devices, and the motor drive device is manufactured so that the degree of noise between the plurality of devices is constant. can do.

[Motor drive device]
In the present embodiment, an example in which the present invention is applied to a motor drive device for a hybrid vehicle will be described.
The structure of the motor drive device according to the present invention is shown in FIGS.
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 is a cross-sectional view taken along the line II-II in FIG. . FIG. 3 is an exploded view showing the support of the stator S and the support structure of the rotor R constituting the motor drive device M. 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 a second motor driving device and a transmission mechanism T (not shown) are 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 to 3, the motor driving device M includes a stator S and a rotor R. In these assembled states, the axial center position of the rotor R is determined by a pair of pivot bearings BRG supported by the mission 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 is composed of a stator core SC and a stator coil SW for the stator core SC, and 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 a plurality of locations (three locations in the present embodiment) equally in the circumferential direction, and projections p1 whose outer peripheral surfaces project radially outward, and each projection p1. A bolt insertion hole p2 for fastening and fixing the stator core SC to the transmission case MC is provided. The laminated stator core SC is fastened and fixed to a seat surface MC1 provided in the mission case MC with a plurality of fastening bolts b1 as fastening means inserted into the bolt insertion holes p2 at a plurality of locations, and has an axial direction D1 and a radial direction D2. It is fixed on both sides. Therefore, in the present embodiment, each of the protruding portions p1 formed by protruding the outer peripheral surface of the stator S radially outward is a fastening portion by the fastening bolt b1 of the stator S.

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.

  As can be seen from FIGS. 1 and 3, 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. As can be seen from FIGS. 1 and 2, the motor drive device is formed as an independent compartment between the engine chamber and the transmission mechanism chamber.

  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 FIGS. 2 and 3, a predetermined gap is provided between the inner peripheral surface MRs of the mission case MC and the outer peripheral surface of the stator S. That is, the inner peripheral surface MRs of the motor drive unit chamber MR includes a circumferential surface MR1 having a diameter slightly larger than the diameter of the outer peripheral surface of the stator S other than the protruding portion p1, and the protruding portion p1 of the stator S. In order to make it escape, it has the escape part MR2 which retreated to the radial direction D2 outer side. The inner peripheral surface MRs is formed with a retraction portion MR3 that is retracted to the outside in the radial direction D2. Out of the inner peripheral surface MRs, both ends of the retraction portion MR3 in the circumferential direction D3 are on the stator contact portion p3. The contacted portion MR4 that contacts with is formed to protrude inward in the radial direction D2 from the circumferential surface MR1. In addition, a seat surface MC1 with which the end surface of the stator core SC abuts is formed inside the motor drive device chamber MR.
The escape portion MR2, the retraction portion MR3, and the contacted portion MR4 are formed across the opening end surface MCO and the seating surface MC1 along the axial direction D1.

  In the present embodiment, three escape portions MR2 are formed corresponding to the protrusion p1 of the stator, and a retraction portion MR3 is formed in a region between the two escape portions MR2. Further, contacted portions MR4 are formed at both ends of the retraction portion MR3 in the circumferential direction D3.

  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 position of the stator S in the axial diameter 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.

As can be seen from FIG. 2, in the motor driving device M of the present invention, the predetermined contact portion p3 set in the circumferential specific phase region U of the outer peripheral surface of the stator S is formed on the inner peripheral surface MRs of the mission case MC. The stator S is fixed to the transmission case MC in a state where the stator S is pressed to one side in the radial direction against the inner peripheral surface MRs of the transmission case MC so as to come into contact.
Here, as shown in FIG. 2, the “circumferential direction specific phase region U” is a region set within a specific phase range in the circumferential direction of the outer peripheral surface of the stator S, and one radial direction against which the stator S is pressed. When the side direction is determined, the region corresponding to the region of the outer peripheral surface of the stator S that can come into contact with the inner peripheral surface MRs of the transmission case MC when the stator S is pressed against the one radial side. Set as Here, a 180 ° phase region between ± 90 ° with the pressing direction d2 as the center is set as the circumferential direction specific phase region U. The contact portion p3 of the outer peripheral surface of the stator S can be set at an arbitrary position in the circumferential direction specific phase region U. However, considering the ease of contact of the contact part p3 with the transmission case MC, the contact part p3 is ± 60 ° in the circumferential specific phase region U with reference to the pressing direction d2. It is preferable that the phase region is set to 120 ° between.

In the present embodiment, as can be seen from FIG. 2, two adjacent protrusions p <b> 1 sandwiching the pressing direction d <b> 2 among the protrusions p <b> 1 that are the fixing points of the stator S to the transmission case MC (fastening portions by the fastening bolts b <b> 1). Contact portions p3 are respectively set on the outer peripheral surface of the stator S in the vicinity of the protruding portion p1. That is, in this example, the contact part p3 is set at two locations in the circumferential specific phase region U of the outer peripheral surface of the stator S. More specifically, the position is about ± 60 ° with respect to the pressing direction d2. Further, it is set to be symmetric with respect to the pressing direction d2. Furthermore, in this example, the contact portion p3 is set in a region between two adjacent projecting portions p1 (fastening portions by fastening bolts b1) in the circumferential specific phase region U. Thus, when the stator S is moved in the pressing direction d2, the contacted portion MR4 and the protruding portion p1 that are formed to protrude from the inner peripheral surface MRs of the mission case MC are prevented from interfering with each other.
Then, the stator S is fastened and fixed to the transmission case MC in a state where the stator S is pressed to one side in the radial direction so that the respective contact portions p3 come into contact with the contacted portion MR4. Further, the second relief portion MR3 formed in the region between the two contacted portions MR4 and the region between the two contact portions of the outer peripheral surface of the stator S face each other.

As described above, for example, the stator S resonates due to the rotation of the rotor R, or the vibration generated in the transmission is transmitted to the stator S via the transmission case MC and the stator S resonates. Is known to vibrate. FIG. 4 shows how the stator S vibrates. As can be seen from FIG. 4, the vicinity of the fastening portion by the fastening bolt b1 (that is, the vicinity of the projecting portion p1) is fixed with respect to the mission case MC. The amount of displacement is reduced. On the other hand, in the region between the projecting portion p1 and the projecting portion p1, the amount of displacement increases because it is separated from the fixed region. Thus, the amount of displacement during vibration varies depending on the circumferential position of the outer peripheral surface of the stator S.
For this reason, if the contact position of the outer peripheral surface of the stator S with the inner peripheral surface MR1 of the transmission case MC is different, the amplitude of vibration transmitted to the transmission case MC is also different, and the degree of noise from the motor driving device M Will be different.

  Therefore, as described above, the stator S is fixed to the transmission case MC in a state where the predetermined contact portion p3 set on the outer peripheral surface of the stator S is in contact with the contacted portion MR4 of the transmission case MC. Thus, in each motor driving device M, a region where the displacement amount when the stator S vibrates is approximately equal is brought into contact with the inner peripheral surface MRs of the mission case MC. For this reason, the amplitude of the vibration transmitted to the mission case MC is also substantially equal, and the degree of noise from the motor drive device M is substantially constant in each motor drive device M.

  Further, a contact portion p3 is set in the vicinity of the projecting portion p1, which is a region where the amount of displacement when vibrating in the outer peripheral surface of the stator S is small compared to other regions, so that the inner peripheral surface of the transmission case MC. By contacting the MRs, vibrations transmitted to the mission case MC can be reduced. For this reason, the noise level itself can be reduced.

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

In the present embodiment, the gap g1 between the outer peripheral surface of the stator and the inner peripheral surface MR1 of the transmission case is set smaller than the gap g2 between the stator S and the rotor R (g1 <g2).
That is, as described above, 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 after the fastening bolt b1 is fastened, The position of the stator S in the axial diameter direction D2 with respect to the transmission case MC is determined. For this reason, when the fastening bolt b1 is loosened, the stator S moves in the stator housing space in the transmission case MC. Therefore, as described above, by setting the gap g1 between the outer peripheral surface of the stator S and the inner peripheral surface of the transmission case MC to be smaller than the gap g2 between the stator S and the rotor R, the movement range of the stator S is increased. Since it is limited within the range of the gap g1 around the rotor shaft center, even if the stator S moves in the axial diameter direction D2, before the rotor R and the stator S come into contact with each other, the outer peripheral surface of the stator S and the transmission case The inner circumferential surface of the MC comes into contact with each other, and the contact between the rotor R and the stator S is prevented. Therefore, even if the fixing of the stator S to the transmission case MC is released during the operation of the motor driving device M, the motor driving device M can be prevented from being damaged.

FIG. 5 is a diagram comparing variations in the degree of noise between individuals in the motor drive device M according to the present invention and the conventional motor drive device.
The motor driving device M according to the present invention is shown in FIGS. Further, as a conventional motor driving device, the motor driving device M according to the present invention is configured to include the components shown in FIG. 3, but is fixed to the transmission case MC without adjusting the stator position as described above. What was done was used. Therefore, in the conventional motor drive device, the relative positional relationship between the mission case MC and the stator S is not constant between the individual units.

  For the measurement of noise, the same number of motors according to the present invention and conventional motors are prepared, and the sound pressure level value (dB value) outside the mission case MC is measured by changing the rotation frequency for each motor driving device. went.

The solid line in FIG. 5 indicates the width of variation in sound pressure level value among individuals in the motor driving apparatus M of the present invention, and the broken line indicates the width of variation in sound pressure level value in a conventional motor case. As can be seen from FIG. 5, in the motor drive device M of the present invention, the lower limit value of the sound pressure level value increased but the upper limit value of the sound pressure level value decreased compared to the conventional motor drive device. That is, in the motor drive device M of the present invention, the range of variation in the sound pressure level value among the individual members is reduced as compared with the conventional motor drive device.
As described above, the predetermined contact portion p3 set on the outer peripheral surface of the stator S is brought into contact with the predetermined contact portion p3 on the inner peripheral surface MRs of the mission case MC, whereby each of the plurality of motor driving devices M. It was shown that the variation of noise level among individuals can be reduced.

[Stator position adjustment device]
6 to 10 show the configuration of the adjusting device 1 as a stator position adjusting means used for manufacturing the motor driving device M described above.
FIG. 6 is a cross-sectional view of a main part for illustrating the configuration of the adjusting device 1. The adjusting 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. Indicates the situation.
7 is a plan view corresponding to FIG. 6, FIG. 8 is a cross-sectional view taken along the line VIII-VIII of FIG. 6, and FIG. Further, FIG. 10 is an exploded view thereof.

  The adjusting device 1 accommodates the stator S in the transmission case MC, the stator S is supported in the axial direction D1 of the rotor R, and the rotor S is not inserted in the stator S in which the rotor R is not inserted. The position (position of the stator S in the axial radial direction D2) is configured to be adjustable. Further, the adjusting 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.

As can be seen from FIGS. 6, 8, 9, and 10, the adjusting device 1 includes a pair of upper and lower end surface plates 2 in FIG. 6. Between the pair of upper and lower end face plates 2, four stator position adjusting mechanisms 4 are evenly stretched in the circumferential direction. The stator position adjustment mechanism 4 includes an eccentric cam 6 on a cam shaft 5 disposed in the axial direction D1.
Note that the number and arrangement of the stator position adjusting mechanisms 4 provided in the adjusting device 1 are not limited to the above-described configuration. For example, one or a plurality of stator position adjustment mechanisms 4 are provided only in a partial region in the circumferential direction so that the stator position adjustment mechanism 4 is located only in the region on the pressing direction d2 side in the inner peripheral surface of the stator S. It may be provided.

  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, and a guide shaft 8 is fixed to the center of one of the end surfaces. Yes.

  As shown in FIG. 6, the guide shaft 8 includes a connecting portion 8 a connected to the ring-shaped end surface plate 2 d on the upper end side, and a shaft bearing that constitutes the case side shaft supporting portion RAS 2 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.

  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 square shape and a connecting plate 13 having a substantially ring shape in a plan view shown in FIG. 7. The rectangular plate 12 and the connecting plate 13 are connected by bolts so that a unitary structure is adopted.

As shown in FIG. 6, a conveyance handle 14 is fixed to the rectangular plate 12. The transport handle 14 is bolted to the rectangular plate 12 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 conveying the leveling device 1, and is used for reference positioning for the fixing operation together with the first center shaft 9a.

  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. 7, the pin engaging members 18 are fixed to the respective longitudinal ends of the rectangular plate 12 by a pair of bolts 19, and the knock pins np enter the pin engaging members 18. Positioning hole 18a. As shown in FIG. 6, 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 18 a.

In the adjusting device 1, the guide shaft 8 is caused to enter the shaft support bearing BRG 2 provided in the case side shaft support portion RAS 2, and in the positioning hole 18 a of the pin engagement member 18 provided at the longitudinal end of the rectangular plate 12. 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, the relative position of the knock pin np and the positioning hole 18a with respect to the fastening bolt b1 causes the adjustment device 1 to be positioned on the transmission case MC by the knock pin np and the positioning hole 18, and the transmission by the fastening bolt b1. A relative position with respect to the stator S fastened and fixed to the case MC is determined.
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.

The positioning configuration of the stator position adjusting device 1 has been described above. Hereinafter, the adjustment of the position of the stator S will be described.
As shown in FIGS. 6, 8, 9, and 10, the cam shafts 5 that are equally provided at 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. Accordingly, 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. 6 and 8, the cam surface 6 s 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 adjusting device 1, a unique device is also provided at the position where the cam 6 is disposed.
As shown in FIGS. 6 and 9, 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 adjusting 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 adjusting device 1, by setting the cam position in the vicinity of the lower end of the stator core SC as described above, the eccentric cams 6 that are evenly arranged in the axial circumferential direction D3 are used, and the axial circumferential direction D3 is used. The position of the stator S in the axial diameter direction D2 can be appropriately adjusted in each part.

[Stator position adjustment method]
Hereinafter, the adjusting device 1 is used to adjust the position of the stator so that a predetermined contact portion set on the outer peripheral surface of the stator S is in contact with the inner peripheral surface of the transmission case, and the stator S becomes the transmission case MC. A series of operations for fixing will be described.

This series of operations includes a vertical arrangement process in which the mission case MC is arranged in a vertical posture on the work device 10, an insertion process in which the stator S is inserted into the mission case MC, and an arrangement in which the adjustment device 1 is arranged in the stator S. A process, an adjustment process for adjusting the stator position, 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. 11, 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. .

  At this time, the shaft case bearing BRG2 constituting the case side shaft support portion RAS2 is won in the transmission case MC, and a 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 adjusting device 1 using these two types of members BRG2, np.

2 Insertion Step As shown in FIG. 12, the stator S is inserted and accommodated in a 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, in the horizontal direction (axial radial direction D2 position), a slight gap exists between the inner peripheral surface MRs of the mission case MC and the outer peripheral surface of the stator S.

3 Arrangement Step As shown in FIG. 13, the adjustment device 1 is arranged in the transmission 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 adjustment device 1 is suspended by the transport portion 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 entire apparatus 1 is supported from below by the end face opening MCO.

4 Pressing Step A predetermined contact portion p3 set in the circumferential specific phase region U on the outer peripheral surface of the stator S is in contact with a predetermined contact portion MR4 set on the inner peripheral surface MRs of the mission case MC. Then, the stator S is pressed against one side in the radial direction D2 against the inner peripheral surface MRs.
Specifically, as shown in FIG. 14, a predetermined contact portion p3 set on the outer peripheral surface of the stator is in contact with a predetermined contact portion MR4 set on the inner peripheral surface MRs of the mission case MC. Further, by appropriately rotating the cam shaft 5 of the adjusting device 1, the stator S is moved in the pressing direction d2 (see FIG. 2) on one side of the radial direction D2, and is moved to the inner peripheral surface MRs of the transmission case MC. The outer peripheral surface of the stator S is brought into contact. The movement 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.
That is, the stator S in the state shown in FIG. 15A is moved in the upper left direction in FIG. 15A by the eccentric cam 6. As a result, as shown in FIG. 15 (b), the predetermined contact portion p3 set on the outer peripheral surface of the stator S contacts the predetermined contact portion MR4 set on the inner peripheral surface MRs of the mission case MC. Touch.

5 Fixing Step After the adjustment step described above, the predetermined contact portion set on the outer peripheral surface of the stator S is in contact with the predetermined contact portion set on the inner peripheral surface of the transmission case MC. As shown in FIG. 13, the stator S is fastened and fixed to the transmission case MC again using the fastening bolt b1. Thereby, the stator S is fixed to the transmission case MC in both the axial direction D1 and the radial direction D2.

6 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 adjustment device 1 is removed from the transmission case MC, and the rotor R is assembled to complete the motor drive device M. To do.

(Another embodiment)
The motor driving device M of the present invention is not limited to the above-described configuration, and the stator is in a state where the predetermined contact portion set on the outer peripheral surface of the stator is in contact with the inner peripheral surface of the transmission case. Any configuration is possible as long as it is fixed to the case. Hereinafter, another embodiment of the motor drive device M according to the present invention will be described.

  (1) The motor drive device M may be, for example, as shown in FIG. This motor drive device M is different from the motor drive device M described above in that two contact portions p3 set in the vicinity of the projecting portion p1 that is a fastening and fixing portion of the stator are in contact with the contacted portion MR4. Although the same, the inner peripheral surface of the transmission case between the two contacted portions MR4 is not retracted radially outward (that is, the second relief portion MR3 is formed in the region between the two contacted portions MR4). Not)) is different. That is, in this example, the contacted portion MR4 is formed to protrude from the inner peripheral surface MRs of the motor case MR.

(2) Moreover, although the example which sets two contact parts in the above-mentioned embodiment was shown, the contact part may be one place and may be more than two places.
FIG. 18 shows an example in which one contact portion is set. In the case of the example shown in FIG. 18, one contacted portion MR4 is formed to protrude from the inner peripheral surface MRs of the motor case MR, and is set in a region between the contacted portion MR4 and the two protruding portions p1. The abutting portion p3 is in abutment.

(3) The motor driving device may be, for example, as shown in FIG. In this motor drive device, the second relief portion formed in the region between the two contacted portions MR4 and the region between the two contact portions p3 in the outer peripheral surface of the stator are opposed to each other. This is the same as the motor drive device described above, but differs in that the contacted part MR3 does not protrude radially inward.
That is, the retraction part MR3 is a circular arc having a diameter smaller than that of the circumferential surface MR1 and decentered in the pressing direction d2 of the stator S with respect to the circumferential surface MR1, and contacts the end portions at both ends in the circumferential direction of the retraction part MR3. A contact portion p3 is set.

(4) In the above-described embodiment, the example in which the pressing step is performed using the eccentric cam 6 as the stator position adjusting means has been described. However, the stator position adjusting means is not limited to the eccentric cam 6, and the stator S Any one can be used as long as it can be moved.
Moreover, you may perform a pressing process, without using a stator position adjustment means.
For example, the mission case MC is inclined or laid down so that the contacted portion MR4 is positioned below the radial direction D2, and the stator S is in a state where the contact portion p3 is in contact with the contacted portion MR4. It may be assembled.
Further, the position of the stator S in the mission case MC may be moved by hitting the outer peripheral surface of the mission case MC with a hammer or the like, and the contact part p3 may be brought into contact with the contacted part MR4.

  INDUSTRIAL APPLICABILITY The present invention can be used as a motor drive device and a method for manufacturing the motor drive device that can make the degree of noise between individual members constant.

The figure which shows the cross-section of a motor drive unit chamber Sectional drawing of the II-II cross section in FIG. The figure which shows the assembly structure of each part which comprises a motor drive device. The figure which shows the state of the vibration of the stator The figure which shows the dispersion | variation in the grade of the noise between several individuals | organisms of a motor apparatus Sectional view of the adjustment device in use Plan view of the adjustment device in use Sectional drawing of the VIII-VIII cross section in FIG. Perspective view of adjusting device Exploded view of 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 Explanatory drawing of the process of fixing the stator to the mission case Sectional drawing which shows the motor drive device which concerns on another embodiment Sectional drawing which shows the motor drive device which concerns on another embodiment Sectional drawing which shows the motor drive device which concerns on another embodiment

Explanation of symbols

1 Adjustment device (stator position adjustment device)
2 End plate 4 Stator position adjusting mechanism 5 Cam shaft 6 Eccentric cam 7 Pin 8 Guide shaft 10 Working device 12 Square plate 13 Connecting plate 14 Carrying handle 18 Pin engaging member BRG Support bearing E Engine M Motor drive device MC Mission 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 (10)

A motor case, a stator housed inside the motor case, and a rotor that is pivotally supported from the motor case and rotates inside the stator,
The with a clearance is provided between the outer peripheral surface of the inner circumferential surface of the motor case stator, abutting portion provided on the outer peripheral surface of the stator is provided on the inner circumferential surface of the motor case The stator is fixed to the motor case in a state where the stator is pressed against one inner side in the radial direction against the inner peripheral surface of the motor case so as to contact the contact portion .
The stator has a fastening portion fastened to the motor case by fastening means and fixed in the axial direction,
The abutted portion is formed to protrude from the inner peripheral surface of the motor case,
The abutting portion is a motor drive device set on an outer peripheral surface of the stator in the vicinity of a fastening portion by the fastening means . Said fastening means is disposed at a plurality of locations in the circumferential direction, the stator, the motor driving device according to claim 1 which is fixed to both the axial and radial direction by the fastening means. The abutment, the motor driving apparatus according to claim 1 or 2 is set to one place or two places of the outer peripheral surface of the stator. In a partial region in the circumferential direction on the inner peripheral surface of the motor case, a retraction portion that is retired radially outward from the other portion is formed,
4. The motor driving device according to claim 1, wherein the abutted portion is set at both circumferential ends of the retraction portion. 5. The abutment, the motor driving apparatus according to any one of 4 claims 2 set in the region between the fastening section according to two of the fastening means adjacent to each other physician. The motor driving device according to claim 5, wherein the contact portion is set at a circumferential end portion of the region between the fastening portions by the two fastening means adjacent to each other. The stator according to any one of claims 2 to 6, wherein the stator includes a plurality of projecting portions having outer peripheral surfaces projecting radially outward at a plurality of locations in the circumferential direction, and each of the projecting portions is a fastening portion by the fastening means . The motor drive device as described in any one . The motor drive device according to any one of claims 1 to 7 , wherein a gap between an outer peripheral surface of the stator and an inner peripheral surface of the motor case is set to be smaller than a gap between the stator and the rotor. . A motor case, a stator that is housed in the motor case with a gap between the motor case and an inner peripheral surface, and a rotor that is pivotally supported from the motor case and rotates inside the stator , The stator is a method of manufacturing a motor driving device configured to have a fastening portion fastened to the motor case by fastening means and fixed in the axial direction ,
Housing the stator in the motor case;
The inner periphery of the motor case is arranged such that an abutting portion provided on the outer peripheral surface of the stator in the vicinity of the fastening portion by the fastening means contacts an abutted portion formed to protrude from the inner peripheral surface of the motor case. A pressing step of pressing the stator against one surface in the radial direction;
And a stator fixing step of fixing the stator to the motor case in a state where the contact portion is in contact with the inner peripheral surface of the motor case. In the pressing step, in a state where the rotor is not accommodated in the stator, the stator is moved to one side in the radial direction by the predetermined stator position adjusting means inserted into the stator, and the motor case The manufacturing method of the motor drive device of Claim 9 pressed against the internal peripheral surface of this.

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