JP2006187163A - Method of processing rotor of rotating machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of processing the rotor of a rotating machine which can improve machining accuracy of a rotor. <P>SOLUTION: This method is a method of processing a rotor for cutting the external peripheral surface of a rotor 100 having a rotary shaft 116, a rolling bearing 120 in which an inner ring is pressed into the rotary shaft 116, pole cores 112 and 114 forced into the rotary shaft 116. In this method, the position of the outer ring of the rolling bearing 120 is set as a machining reference position, and the external peripheral surface of the rotor 100 is cut while maintaining a state where loads are applied to the inner and outer rings from opposite directions along the rotary shaft 116. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for processing a rotor of a rotating electrical machine such as an AC generator for a vehicle.

BACKGROUND ART A rotating electrical machine such as a vehicular AC generator includes a rotor having a field winding and a stator disposed on the outer peripheral side thereof. This rotor is provided with a rotor core press-fitted into the rotating shaft, and a structure is employed in which two portions of the rotating shaft sandwiching the rotor core are rotatably supported using a rolling bearing. By the way, if this rotor vibrates during rotation, it may cause abnormal noise, abnormal wear of the slip ring, etc., and a structure for suppressing the occurrence of vibration has been proposed (for example, see Patent Document 1). In this proposal, the vibration of the claw portion of the rotor core is suppressed by using the vibration suppressing body.
JP 11-136914 A (page 2-4, FIG. 1-10)

  By the way, it is possible to suppress the vibration itself of the part by equipping the part where the rotor vibrates like the rotor disclosed in Patent Document 1 with the vibration suppressing body. If the machining accuracy is low, there is a problem that vibration during rotation cannot be prevented. For example, the surface of a slip ring provided near one end of a rotating shaft is cut after the assembly of the rotor is completed. The slip ring surface vibrates and causes abnormal wear of the brush. The same applies to the surface of the rotor core. In particular, when machining the outer peripheral surface of a slip ring or the like with a rolling bearing attached to the rotor, the load is applied from the side where the cutting tool abuts. This causes a problem that the processing accuracy decreases.

  The present invention was created in view of the above points, and an object thereof is to provide a method of processing a rotor of a rotating electrical machine that can improve the processing accuracy of the rotor.

  In order to solve the above-described problems, a method of processing a rotor of a rotating electrical machine according to the present invention includes a rotating shaft, a rolling bearing in which an inner ring portion is press-fitted into the rotating shaft, and a rotor core press-fitted into the rotating shaft. The outer peripheral surface of the rotor is cut, and the position of the outer ring portion of the rolling bearing is set as the processing reference position, and the outer ring portion and the inner ring portion are loaded in opposite directions along the rotation axis. It is desirable to cut the outer peripheral surface of the rotor while maintaining it. Specifically, the rolling bearing described above includes a plurality of balls disposed between the inner ring portion and the outer ring portion, and a holder that rotatably holds the plurality of balls, and is formed on the outer peripheral side of the inner ring portion. The opposing surface of the ball and the opposing surface of the ball formed on the inner peripheral side of the outer ring portion have a shape along the outer shape of the ball, and the outer ring portion and the inner ring portion have opposite directions along the rotation axis. It is desirable to limit the radial movement of the inner ring portion disposed with the ball sandwiched between the outer ring portion by applying the above load. Thereby, even when there is a radial gap between the ball and the outer ring portion and the inner ring portion, by applying loads in opposite directions along the rotation axis direction with respect to the inner ring portion and the outer ring portion, Since this radial gap can be eliminated, the rotor is not eccentric in the radial direction due to a load applied in the radial direction during processing, and the processing accuracy during cutting can be improved.

  In addition, it is desirable to rotate the rotor by using a rotation driving unit that applies a load in the circumferential direction while pressing the outer circumferential surface of the rotor core in the radial direction. In this way, even when a load is applied in the radial direction to rotate the rotor by the rotation drive means, the rotor is not eccentric in the radial direction, so the machining accuracy during cutting is reliably improved. Can be made.

  Moreover, it is desirable that the load applied by the rotation driving means described above has a component along the rotation axis as well as a component along the circumferential direction. Specifically, the rotational drive means described above has a drive belt that comes into contact with the outer peripheral surface of the rotor core in a pressed state, and the drive belt is inclined with respect to the outer peripheral surface of the rotor core. It is desirable to contact with. As a result, it is possible to apply a load in one direction to the inner ring portion of the rolling bearing simultaneously with the rotational driving of the rotor using one rotational driving means, and the entire processing apparatus can be simplified.

  In addition, the movement along the radial direction of the rotating shaft can be restrained by a rotatable roller by contacting the outer peripheral surface of the rotating shaft on the opposite side of the rolling bearing with the rotor core described above interposed therebetween. desirable. Thereby, even if it receives a load in the radial direction at the time of rotational driving, it becomes possible to restrict the movement of the rotor in the radial direction by the rolling bearing and the roller, and the processing accuracy can be increased.

  In addition, a slip ring connected to the field winding is provided near one end of the rotating shaft described above, and the slip ring is relative to the cutting tool while the cutting tool is in contact with the outer peripheral surface of the slip ring. It is desirable that the outer peripheral surface of the slip ring is cut by rotating it. Thereby, the processing precision in the outer periphery cutting of a slip ring can be improved.

  Hereinafter, a method of processing a rotor of a rotating electrical machine according to an embodiment to which the present invention is applied will be described in detail with reference to the drawings.

[First Embodiment]
FIG. 1 is a diagram illustrating a partial configuration of the rotor machining apparatus according to the first embodiment. This rotor processing apparatus is for cutting the outer periphery of slip rings 130 and 132 provided in the rotor 100 with a predetermined external dimension and surface roughness.

  The rotor 100 is used in, for example, an automotive alternator, and includes a field winding 110, pole cores (rotor cores) 112 and 114, a rotating shaft 116, and the like, and rolls on a part of the rotating shaft 116. A bearing 120 is press-fitted. This rolling bearing 120 is for supporting the rotor 100 by a frame rotatably together with a rolling bearing (not shown) attached to the frame. Cooling fans 122 and 124 are attached to the axial end surfaces of the pole cores 112 and 114. A pair of slip rings 130 and 132 is provided on one end side of the rotating shaft 116. Each of the slip rings 130 and 132 is connected to both ends of the field winding 110, and an excitation current is supplied to the field winding 110 via a brush device (not shown) and the slip rings 130 and 132. It is like that.

  The rotor machining apparatus according to the present embodiment includes a rotation drive unit (rotation drive unit) 10 that rotates the rotor 100, a cylindrical member 20 that supports an outer peripheral portion of a rolling bearing 120 included in the rotor 100, and a pole core. A roller 30 that is on the opposite side of the rolling bearing 120 with 112 and 114 interposed therebetween and abuts on a part of the rotating shaft 116 and a cutting tool 40 that cuts the outer periphery of the slip rings 130 and 132 are provided.

  FIG. 2 is a diagram showing an outline of the rotation drive unit 10. The rotary drive unit 10 includes a drive belt 12 and two rollers 14 and 16 arranged at a predetermined interval to stretch the drive belt 12 along the outer peripheral surfaces of the pole cores 112 and 114. As shown in FIG. 2, the drive belt 12 is brought into contact with the outer peripheral surfaces of the pole cores 112 and 114 in a state where the drive belt 12 is given a predetermined tension using the two rollers 14 and 16. When the drive belt 12 is rotated in one direction using a drive motor (not shown), a circumferential drive force (on the outer circumferential surface of the pole core 112, 114 is applied by the frictional force between the drive belt 12 and the pole core 112, 114). Load) acts, and the rotor 100 can be rotated in one direction.

  FIG. 3 is a diagram showing an outline of the cylindrical member 20. The cylindrical member 20 has a cylindrical shape with an opening on the side on which the rolling bearing 120 abuts. The opening has a stepped cross-sectional shape that abuts on the outer peripheral surface of the outer ring portion 120a of the rolling bearing 120 and one axial end surface, and constrains the radial position and the axial position of the outer ring portion 120a.

  As shown in FIG. 1, the cylindrical member 20 has an opening 22 along the axial direction in a part of the side surface. The opening 22 is for contacting the tip of the cutting tool 40 to the slip rings 130 and 132. The blade tool 40 is movable in a direction V and a direction H parallel to the rotation shaft 116 (drive unit is not shown), and the blade tool 40 passes through the opening 22 of the tubular member 20 when the slip rings 130 and 132 are processed. Moves axially along the surface of the slip rings 130, 132.

  The roller 30 is for restraining the position of the rotating shaft 116 so that the rotating shaft 116 does not move in this pressing direction when the driving belt 12 of the rotation driving unit 10 is pressed against the rotor 100. In FIG. 1, one roller 30 is shown, but at least two rollers 30 are used to prevent the rotation shaft 116 from moving.

  As shown in FIG. 3, the rolling bearing 120 includes an annular outer ring portion 120a and an inner ring portion 120b, a plurality of balls 120c arranged between the outer ring portion 120a and the inner ring portion 120b, and a plurality of balls. A holder 120d for rotatably holding the ball 120c. Each of the opposing surface to the ball 120c formed on the inner peripheral side of the outer ring portion 120a and the opposing surface to the ball 120c formed on the outer peripheral side of the inner ring portion 120b has a shape along the outer shape of the ball 120c. ing. Specifically, each opposing surface has a spherical shape having a radius slightly larger than the radius of the ball 120c so that a substantially uniform gap that does not hinder the rotation of the ball 120c is generated. As described above, since there is a gap between the ball 120c and the outer ring portion 120a or the inner ring portion 120b, when the rotor 100 is pressed from one direction by the rotation drive unit 10, the gap is eccentric by the gap. For this reason, in the present embodiment, loads in opposite directions along the rotation shaft 116 are applied to the outer ring portion 120a and the inner ring portion 120b to relatively shift the respective axial positions to eliminate these gaps. Thus, the outer peripheral surface of the outer ring portion 120a in a state where there is no gap is the processing reference position.

  FIG. 4 is a diagram illustrating a state of the rolling bearing 120 during processing. As shown in FIG. 4, the position of the outer ring portion 120 a of the rolling bearing 120 is constrained by contacting the outer peripheral surface and the right end surface along the axial direction with the cylindrical member 20. In this state, the rotating shaft 116 is loaded in the right direction (the direction from the pole cores 112 and 114 toward the slip rings 130 and 132 in FIG. 1), and the inner ring portion 120b of the rolling bearing 120 press-fitted into the rotating shaft 116 is moved to the right. When pressed in the direction, as shown in FIG. 4, the inner ring portion 120b moves to the right until a portion of the ball 120c abuts against a portion of the inner ring portion 120b, and a portion of the outer ring portion 120a The ball 120c moves rightward until a part of the ball 120c comes into contact with certainty. As described above, since it is possible to maintain the state in which the ball 120c is partly in contact with the outer ring portion 120a and the inner ring portion 120b, the rotation driving unit 10 presses the rotor 100 from one direction during processing. However, the outer ring portion 120a does not move in the radial direction and become eccentric.

  In the present embodiment, the rotation drive unit 10 is used as a mechanism for applying a load in the right direction with respect to the rotation shaft 116. As shown in FIG. 1, the drive belt 12 of the rotation drive unit 10 is arranged to be inclined with respect to the rotation shaft 116. Specifically, the contact surface of the drive belt 12 is inclined so as to approach the rotation shaft 116 on the anti-slip ring side. For this reason, when the drive belt 12 is pressed against the pole cores 112 and 114 and deformed, the component (axial load) that presses the pole cores 112 and 114 from the drive belt 12 along the rotating shaft 116 toward the slip rings 130 and 132. ) Occurs. The inner ring portion 120b is pressed toward the slip rings 130 and 132 by the axial load.

Next, a schematic process in the case of cutting the outer peripheral surfaces of the slip rings 130 and 132 of the rotor 100 using the above-described rotor processing apparatus will be described.
(1) First, a predetermined position of the rotating shaft 116 is placed on the plurality of rollers 30 in a state where the cylindrical member 20 is attached to the outer ring portion 120 a of the rolling bearing 120.
(2) Next, the rotary drive unit 10 arranged on the upper part of the rotor 100 is lowered, and the drive belt 12 is pressed against the surfaces of the pole cores 112 and 114.
(3) Next, while maintaining this state, the rotation drive unit 10 is operated, and the drive belt is moved in one direction to rotate the rotor 100.
(4) Next, the tip of the cutting tool 40 is moved until it contacts the surface of the slip ring 130 (or 132).
(5) Next, the cutting tool 40 is moved along the axial direction while maintaining the radial position of the cutting tool 40, and the entire outer peripheral surface of the slip rings 130 and 132 is cut to have a predetermined diameter and surface roughness. Process. After the cutting of the entire outer peripheral surface of the slip rings 130 and 132 is completed, the rotation of the rotor 100 is stopped and the rotor 100 is taken out after the rotation drive unit 10 is raised.

  As described above, in the rotor machining apparatus according to the present embodiment, even when there is a radial gap between the ball 120c of the rolling bearing 120 provided in the rotor 100 and the outer ring portion 120a and the inner ring portion 120b. By applying a load in the opposite direction along the direction of the rotation axis 116 to the inner ring portion 120b and the outer ring portion 120a, this radial gap can be eliminated. Therefore, the rotor 100 is affected by the load applied in the radial direction during processing. Is not eccentric in the radial direction, and the machining accuracy during cutting can be improved. In particular, even when a load is applied in the radial direction in order to rotate the rotor 100 by the rotation drive unit 10, the rotor 100 is not eccentric in the radial direction, so that the processing accuracy during the cutting process can be reliably ensured. Can be improved.

  In addition, the load applied to the rotor 100 by the rotation driving unit 10 has a component along the rotating shaft 116 (axial load) along with a component along the circumferential direction. Specifically, the axial load is generated by bringing the drive belt 12 of the rotary drive unit 10 into contact with the outer peripheral surfaces of the pole cores 112 and 114 in an inclined state. Thereby, it becomes possible to apply a load in one direction to the inner ring portion 120b of the rolling bearing 120 simultaneously with the rotation driving of the rotor 100 using one rotation driving unit 10, and the structure of the entire rotor processing apparatus Can be simplified.

[Second Embodiment]
By the way, in 1st Embodiment mentioned above, although the outer peripheral surface of the slip rings 130 and 132 was cut with respect to the rotor 100 in the state to which the rolling bearing 120 was attached, before a rolling bearing 120 is attached, a slip ring is attached. A case where the outer peripheral surfaces 130, 132, etc. are cut is also conceivable. Next, a device for improving the processing accuracy of the rotor 100A will be described.

  FIG. 5 is a diagram illustrating a schematic configuration of the rotor machining apparatus according to the second embodiment. The rotor machining apparatus shown in FIG. 5 is on the opposite side across the pole cores 112 and 114 with the recess provided on the slip ring side end of the rotor 100A attached to the rotatable end holding jig 50. The outer periphery of the rotating shaft 116 that is positioned (the outer peripheral position corresponding to the mounting position of the rolling bearing) is gripped by the three-way chuck 52. The three-way chuck 52 is fixed by a fixing jig 56 via an aligning ball bearing 54. When the rotating shaft 116 attached to the aligning ball bearing 54 is inclined and the entire three-way chuck 52 is inclined, the rotation center axis of the inner ring portion is inclined in accordance with this inclination. For this reason, even if the rotation shaft 116 is bent and the center axis corresponding to each rolling bearing is eccentric, the rotation center of the aligning ball bearing 54 is inclined in accordance with the bent rotation shaft 116, By cutting the slip ring with the axis A connecting the three-way chuck 52 and the end holding jig 50, the outer peripheral cylindrical axis after the slip ring cutting becomes an axis parallel to the axis A. On the other hand, in the case of fixing the rotary shaft 116 with a center (end holding jig) and a three-way chuck that does not include a centering ball bearing, which is commonly found in cutting machines, the deflection of the rotary shaft 116 causes the inner peripheral surface and end of the three-way chuck 52 to be bent. The rotating shaft 116 after cutting is corrected by the elasticity of the axis that connects the center of the three-way chuck 52 and the center of the end holding jig 50 by the conical surface of the holding jig 50, and is released from the three-way chuck 52. The central axis of the outer cylindrical portion after slip ring cutting is oriented along the deflection. The inclination of the axis connecting the bearing 120 and the slip ring cylindrical surface with respect to the axis based on each rolling bearing 120 or the like serving as a rotation axis when the rotor is used is second compared to the case of the cutting machine in general. The case of the embodiment is smaller. Therefore, the inclination of the slip ring due to the influence of the deflection of the rotating shaft 116 can be reduced.

  FIG. 6 is a diagram illustrating another example of the rotor machining apparatus according to the second embodiment. The rotor machining apparatus shown in FIG. 6 has a configuration in which the aligning ball bearing 54 provided in the rotor machining apparatus shown in FIG. The constant velocity joint 58 includes an inner ring portion, an outer ring portion, and a ball in the same manner as the rolling bearing, and the rotation shaft 116 of the rotor 100A is attached to the inner ring portion. The constant velocity joint 58 can maintain the rotation of the rotation shaft 116 even when the direction of the rotation center of the fixing jig 56 that fixes the outer peripheral side is different from the direction of the rotation center of the rotation shaft 116. Therefore, the inclination of the slip ring due to the influence of the deflection of the rotating shaft 116 can be reduced.

  FIG. 7 is a diagram illustrating another example of the rotor machining apparatus according to the second embodiment. In the rotor processing apparatus shown in FIG. 7, the rotating shaft 116 of the rotor 100 </ b> A is directly gripped by the three-way chuck 52. The three-way chuck 52 is fixed to the universal joint 60, and the radial position of the rotation center can coincide with the rotation center of the rotation shaft 116 of the rotor 100A. The same effect as in the case of FIGS. 5 and 6 can be obtained.

  FIG. 8 is a diagram illustrating another example of the rotor machining apparatus according to the second embodiment. The rotor processing apparatus shown in FIG. 8 uses the cutting tool 66, 68, 70 and the slip ring 130 while the rotor 100A is rotatably held by the fixing jigs 62, 64 at both ends of the rotating shaft 116 of the rotor 100A. 132, both sides of the rotating shaft 116 sandwiching the pole cores 112 and 114 and the outer diameter of the pole cores 112 and 114 are cut. Thereby, it becomes possible to cut each part using a common reference position without fixing the rotor 100A again, and it is possible to improve the processing accuracy.

  In addition, this invention is not limited to the said embodiment, A deformation | transformation implementation is possible within the range of the summary of this invention. For example, in the first embodiment, the rotor 100 is rotated by the rotary drive unit 10 using the drive belt 12, but may be rotated using a roller or the like. In addition, the axial load is generated by pressing the pole cores 112 and 114 while the drive belt 12 is tilted, but the axial load is generated using a pressure member different from the rotation drive unit 10. May be generated.

  Further, in the first embodiment described above, the outer periphery of the slip rings 130 and 132 is cut, but other portions (such as the outer periphery of the pole cores 112 and 114) may be cut. Moreover, this invention is applicable not only when cutting an outer peripheral surface but when cutting an inner peripheral surface.

It is a figure which shows the partial structure of the rotor processing apparatus of 1st Embodiment. It is a figure which shows the outline | summary of a rotation drive part. It is a figure which shows the outline | summary of a cylindrical member. It is a figure which shows the state of the rolling bearing at the time of a process. It is a figure which shows schematic structure of the rotor processing apparatus of 2nd Embodiment. It is a figure which shows the other example of a rotor processing apparatus. It is a figure which shows the other example of a rotor processing apparatus. It is a figure which shows the other example of a rotor processing apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Rotation drive part 12 Drive belt 20 Cylindrical member 30 Roller 40 Cutting tool 100 Rotor 112, 114 Pole core 116 Rotating shaft 120 Rolling bearing 120a Outer ring part 120b Inner ring part 120c Ball 120d Holder 122, 124 Cooling fan 130, 132 Slip ring

Claims (7)

In a method of processing a rotor of a rotating electrical machine that cuts an outer peripheral surface of a rotor having a rotating shaft, a rolling bearing in which an inner ring portion is press-fitted into the rotating shaft, and a rotor core press-fitted into the rotating shaft,
The position of the outer ring portion of the rolling bearing is set as a processing reference position, and the outer peripheral surface of the rotor is maintained while maintaining a state in which a load in the opposite direction is applied to the outer ring portion and the inner ring portion along the rotation axis. A method of processing a rotor of a rotating electrical machine, characterized by cutting. In claim 1,
The rolling bearing includes a plurality of balls disposed between the inner ring portion and the outer ring portion, and a holder that rotatably holds the plurality of balls.
The surface facing the ball formed on the outer peripheral side of the inner ring portion and the surface facing the ball formed on the inner peripheral side of the outer ring portion have a shape along the outer shape of the ball. ,
Limiting the radial movement of the inner ring portion disposed with the ball between the outer ring portion by applying a load in the opposite direction along the rotation axis to the outer ring portion and the inner ring portion. A method of processing a rotor of a rotating electrical machine characterized by In claim 1 or 2,
A method of processing a rotor of a rotating electrical machine, wherein the rotor is rotated by using a rotation driving unit that applies a load in a circumferential direction in a state where the outer periphery of the rotor core is pressed in a radial direction. In claim 3,
The load applied by the rotation driving means has a component along the rotation axis as well as a component along the circumferential direction, and a method of processing a rotor of a rotating electrical machine. In claim 4,
The rotation driving means has a drive belt that contacts the outer peripheral surface of the rotor core in a pressed state, and contacts the drive belt in an inclined state with respect to the outer peripheral surface of the rotor core. A method of processing a rotor of a rotating electrical machine, characterized in that: In any one of Claims 3-5,
The movement along the radial direction of the rotating shaft is constrained by a rotatable roller by contacting the outer peripheral surface of the rotating shaft on the opposite side of the rolling bearing across the rotor core. A method of processing a rotor of a rotating electric machine characterized by the above. In any one of Claims 1-6,
Near one end of the rotating shaft is provided with a slip ring connected to a field winding,
In a state in which a cutting tool is in contact with the outer peripheral surface of the slip ring, the outer peripheral surface of the slip ring is cut by rotating the slip ring relative to the cutting tool. How to process the rotor.

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