JP6952931B1 - Rotating machine - Google Patents

Abstract

To solve the problem that the bearing fixing member 60a easily falls from the shaft 20 or the workability of the bearing removal work is poor, the bearing fixing member 60a provided with the shaft through hole 63 closed in the circumferential direction is provided, and the bearing fixing member 60a is provided. The 60a is provided with a notch portion 62a having a shape notched from the outer circumference to the inside, and the radial distance L1 between the portion of the notch portion 62a closest to the central axis AX and the central axis AX is the bearing 50a. Provided is a rotary electric machine 100a characterized in that it is smaller than the radius L2 of the outer peripheral 53 and larger than the radial distance L3 between the central axis AX and the portion farthest from the central axis AX on the inner circumference of the shaft through hole 63. do.

Description

The present disclosure relates to a rotary electric machine having a bearing.

In a rotary electric machine, a bearing is installed on a bracket attached to a stator via a frame, and a shaft to which the rotor is fixed is rotatably supported by the bearing to rotate the rotor. In order to prevent the bearing from moving in the direction of the central axis where the central axis of the shaft extends, a bearing fixing member that holds the bearing to the bracket is attached to the bracket. The bearing fixing member is provided with a shaft through hole through which the shaft passes in the center.

The gap between the rotor and the bearing in the central axial direction is often narrow in order to shorten the total length of the rotating electric machine. Therefore, when replacing the bearing in the maintenance and inspection of the rotary electric machine, the workability of hooking the claw of the drawing tool, which is a tool for pulling out the bearing from the shaft, on the bearing is poor, and it takes time to replace the bearing.

Patent Document 1 which discloses a conventional rotary electric machine discloses a bearing fixing member provided with a notch extending from the shaft through hole to the outer circumference in one direction of the shaft through hole. By providing a notch extending to the outer circumference in one direction of the shaft through hole, the bearing fixing member can be attached and detached from the side of the shaft, and the bearing can be removed with the bearing fixing member removed. I am doing it.

Jitsukaisho 51-07714A

However, the bearing fixing member disclosed in Patent Document 1 is provided with a notch extending to the outer periphery in one direction of the shaft through hole, so that the bearing fixing member is removed when the bearing fixing member is removed during the bearing removal work. There was a problem that it was easy to fall from the shaft.

The present disclosure has been made in order to solve the above-mentioned problems, and an object of the present disclosure is to provide a rotary electric machine capable of improving the work efficiency of bearing removal work without the bearing fixing member falling from the shaft.

The rotary electric machine according to the present disclosure can be rotated by a stator structure having a stator and a stator support portion that supports the stator, a bracket attached to the stator structure, a bearing arranged on the bracket, and a bearing. The shaft supported by the shaft, the rotor fixed to the shaft, and the bearing and the rotor are mounted on the bracket, and a shaft through hole closed in the circumferential direction through which the shaft passes is provided to bracket the bearing. The bearing fixing member has a first surface facing the rotor and a second surface facing the rotor, and the bearing fixing member is provided from the outer periphery of the bearing fixing member. A notch portion having a shape notched so as to penetrate from the first surface to the second surface toward the inside is provided, and the portion of the notch portion closest to the central axis of the shaft and the central axis in the radial direction distance is smaller than the radius of the outer periphery of the bearing and the shaft through hole much larger than the radial distance between the farthest point and the central axis from the inner periphery of the central axis of the exposed end face of the bearing in the notches it is intended to.

According to the rotary electric machine according to the present disclosure, the work efficiency of the bearing removal work can be improved without the bearing fixing member falling from the shaft.

It is sectional drawing which shows the rotary electric machine which concerns on Embodiment 1 of this disclosure. It is an external view of the bearing fixing member which concerns on Embodiment 1 of this disclosure. It is sectional drawing which cut | cut the bearing fixing member which concerns on Embodiment 1 of this disclosure along the line AA of FIG. It is sectional drawing which cut | cut the bearing fixing member which concerns on Embodiment 1 of this disclosure along the line BB of FIG. It is a schematic diagram of the bearing removal work which concerns on Embodiment 1 of this disclosure. It is an external view of the bearing fixing member which concerns on Embodiment 2 of this disclosure. It is an external view of the bearing fixing member which concerns on Embodiment 3 of this disclosure. It is sectional drawing which shows the rotary electric machine which concerns on Embodiment 4 of this disclosure. It is an external view of the bearing fixing member which concerns on Embodiment 4 of this disclosure. It is a schematic diagram of the bearing removal work which concerns on Embodiment 4 of this disclosure.

Hereinafter, the rotary electric machine according to the embodiment of the present disclosure will be described in detail with reference to the drawings. In the embodiment of the present disclosure, an example in which the rotary electric machine is an induction motor will be described.

Embodiment 1.
First, the configuration of the rotary electric machine according to the first embodiment of the present disclosure will be described. FIG. 1 is a cross-sectional view showing a rotary electric machine according to the first embodiment of the present disclosure. In FIG. 1, the upper side of the central axis AX shows the cross section, and the lower side of the central axis AX shows the appearance.

In FIG. 1, the rotary electric machine 100a includes a stator 31, a frame 32, brackets 40a and 40b, bearings 50a and 50b, a bearing fixing member 60a, a rotor 10, and a shaft 20. The rotor 10 is rotatably installed on the stator 31 about the central axis AX, which is the center of rotation of the shaft. In the following description, the direction in which the central axis AX extends is described as the central axis direction, the direction in which the central axis AX rotates around the central axis AX is described as the circumferential direction, and the direction perpendicular to the central axis AX is described as the radial direction.

The stator 31 includes a stator core 311 and a coil end 312. The stator 31 is fitted and fixed to a frame 32 which is a stator support portion for supporting the stator 31, and the stator 31 and the frame 32 form a stator structure 30. That is, the rotary electric machine 100a includes the stator structure 30. The stator structure 30 has a stator 31 and a frame 32 which is a stator support portion for supporting the stator. Brackets 40a and 40b are attached to both sides of the frame 32 which is a part of the stator structure 30. That is, the brackets 40a and 40b are attached to the stator structure 30. Bearings 50a and 50b are arranged on the brackets 40a and 40b. The bearing 50a is a bearing, has an outer ring 51 and an inner ring 52, and the inner ring 52 rotates with respect to the outer ring 51. The bearing 50a is arranged so that the outer ring 51 is in contact with the bracket 40a.

The rotor 10 includes a rotor core 11 and end rings 12 provided on both end faces of the rotor core 11. That is, the rotor core 11 and the end ring 12 are a part of the rotor 10. The rotor 10 is fixed is fitted to the shaft 20. The shaft 20 is rotatably supported around the central axis AX by bearings 50a and 50b. The rotor 10 can rotate around the central axis AX together with the shaft 20. The shaft end surface 21, which is the end surface of the shaft end in the direction in which the bearing 50a of the shaft 20 is attached, is provided with a center hole 211 which is a bottomed hole at the center where the central shaft AX and the shaft end surface 21 intersect.

The bearing fixing member 60a is arranged between the bearing 50a and the rotor 10 in the central axial direction, and is attached to the bracket 40a. In other words, the bearing fixing member 60a is arranged on the side opposite to the side where the bracket 40a is located with respect to the bearing 50a in the central axial direction, and is attached to the bracket 40a. The bearing fixing member 60a is provided with a shaft through hole 63 that is closed in the circumferential direction, and the shaft 20 passes through the shaft through hole 63. The bearing fixing member 60a holds the bearing 50a against the bracket 40a and fixes it. More specifically, the bearing fixing member 60a presses the outer ring 51 of the bearing 50a against the bracket 40a from the side where the rotor 10 is arranged toward the bracket 40a in the central axial direction, and brackets the outer ring 51 of the bearing 50a. It is fixed at 40a. As a result, the bearing fixing member 60a prevents the bearing 50a from moving in the central axial direction.

Next, the bearing fixing member 60a will be described in detail. FIG. 2 is an external view of the bearing fixing member according to the first embodiment of the present disclosure, and is viewed from the direction of the bearing 50a side in the central axial direction when the bearing fixing member 60a is arranged in the rotary electric machine 100a. It shows the appearance. FIG. 3 is a cross-sectional view of the bearing fixing member 60a according to the first embodiment of the present disclosure, which is cut along the line AA of FIG. FIG. 4 is a cross-sectional view of the bearing fixing member according to the first embodiment of the present disclosure cut along the line BB of FIG. The cross section of the bearing fixing member 60a in FIG. 1 shows a cross section cut along the line CC in FIG. In FIG. 2, the central axis AX is indicated by a point. A part of the outer circumference 53 of the bearing 50a is shown by a dotted line.

In FIG. 2, the bearing fixing member 60a has a disk-like shape having an outer circumference 61a which is an arc centered on the central axis AX when viewed from the central axis direction, and has a shaft through hole 63 and two notches. A portion 62a and four screw holes 64 are provided.

The shaft through hole 63 is provided so that the shaft 20 centered on the central axis AX passes through when the bearing fixing member 60a is arranged in the rotary electric machine 100a. In FIG. 2, the shaft through hole 63 is a circular hole that penetrates in the central axis direction about the central axis AX. The hole diameter of the shaft through hole 63 is larger than the diameter of the shaft 20 at the position where the bearing fixing member 60a is arranged in the rotary electric machine 100a and the shaft 20 passes through the shaft through hole 63. That is, the shaft through hole 63 is larger than the cross section of the shaft 20. As a result, the shaft 20 can rotate without contacting the bearing fixing member 60a attached to the bracket 40a with the shaft 20.

Further, in FIG. 2, the shaft through hole 63 is a hole closed in the circumferential direction. As a result, when the shaft 20 is passed through the shaft through hole 63, the bearing fixing member 60a does not come off from the shaft 20 on the side of the shaft 20, and the bearing fixing member 60a does not fall from the shaft 20.

In the present embodiment, the shaft through hole 63 will be described as an example of a circular hole centered on the central axis AX. However, the shaft 20 passes through the shaft through hole 63, and the bearing fixing member 60a is brought into contact with the shaft 20. However, as long as the hole is closed in the circumferential direction, it may be a polygonal hole or a hole whose center is deviated from the central axis AX.

In FIG. 2, the notch portion 62a has a shape notched from the outer circumference 61a of the bearing fixing member 60a, which is an arc centered on the central axis AX, toward the inside of the bearing fixing member 60a. The notch portion 62a is composed of two notch side surfaces 621a and a notch end surface 622a. In the following description, a plane extending in the radial direction including the central axis AX of the shaft and which is a reference plane for the shape of the notch portion 62a will be referred to as a reference plane XR.

The notched side surface 621a is a flat surface extending inward from the outer circumference 61a of the bearing fixing member 60a. The notch side surface 621a is a plane parallel to the reference plane XR, separated from the reference plane XR by half (H / 2) of the notch width H having a constant length. The two notched side surfaces 621a included in one notched portion 62a are parallel to each other with a certain distance H apart from each other.

The notch end surface 622a is a surface that connects two notch side surfaces 621a included in one notch portion 62a at the inner end of the bearing fixing member 60a. In FIG. 2, the notched end surface 622a is a plane that is separated from the central axis AX by a certain radial distance L1 and is parallel to the central axis AX and perpendicular to the reference plane XR.

In FIG. 2 when the bearing fixing member 60a is viewed from the central axis direction, the reference plane XR is shown by a straight line extending in the radial direction, which is a projection of the reference plane XR in the central axis direction. The notch side surface 621a is shown as two parallel straight lines separated by half (H / 2) of the notch width H from the straight line which is the projection of the reference plane XR, and the bearing fixing member is shown from the outer circumference 61a. It extends inward of 60a. The notched end face 622a is shown as a straight line perpendicular to a straight line that is a projection of the reference plane XR at a distance L1 from the central axis AX. The shape of the notch 62a when the bearing fixing member 60a is viewed from the central axis direction is such that two parallel straight lines extending inward from the outer circumference 61a of the bearing fixing member 60a, which is a projection of the notch side surface 621a, are the inner ends of the straight lines. It is a U-shape connected by.

The two notches 62a provided in the bearing fixing member 60a are located at point-symmetrical positions with respect to the point of the central axis AX in the external view of FIG. 2 viewed from the central axis direction, and are evenly spaced at a circumferential angle. In position.

The notch end 623a is a portion closest to the central axis AX of the notch portion 62a, and is a line where the notch end surface 622a and the reference plane XR intersect in FIG. The radial distance between the notch end 623a and the central axis AX is the distance L1. The distance L1 is smaller than the radius L2 of the outer circumference 53 of the bearing 50a. That is, the radial distance L1 between the portion of the notch 62a shaft 20 closest to the central axis AX and the central axis AX is smaller than the radius L2 of the outer circumference 53 of the bearing 50a. As a result, a hooking surface region on which the claw 931 of the drawing tool, which will be described later, can be engaged is generated on the end surface of the bearing 50a on the rotor 10 side.

The distance L1 between the notch end 623a, which is the position closest to the central axis AX of the shaft 20 of the notch portion 62a, and the central axis AX is larger than the radius L3 of the shaft through hole 63. In FIG. 2, since the shaft through hole 63 is a circular hole penetrating in the central axis direction about the central axis AX, the radius L3 of the shaft through hole 63 is from the central axis AX on the inner circumference of the shaft through hole 63. This is the radial distance between the farthest point and the central axis AX. That is, the radial distance L1 between the portion of the notch 62a that is closest to the central axis AX of the shaft 20 and the central axis AX is the location that is farthest from the central axis AX on the inner circumference of the shaft through hole 63 and the central axis AX. Is larger than the radial distance L3. As a result, since the notch portion 62a does not reach the shaft through hole 63 from the outer circumference 61a, the shaft through hole 63 is a hole closed in the circumferential direction, and if the shaft 20 is passed through the shaft through hole 63, the bearing is fixed. The member 60a does not come off from the shaft 20 on the side of the shaft 20.

The radius of the outer circumference 61a of the bearing fixing member 60a is larger than the radius L2 of the outer circumference 53 of the bearing 50a. In FIG. 2, the distance between the outer peripheral 61a, which is the farthest point from the central axis AX of the bearing fixing member 60a, and the central axis AX is the radius of the outer peripheral 61a of the bearing fixing member 60a, and is larger than the radius L2 of the outer peripheral 53 of the bearing 50a. big.

The screw hole 64 has a female thread on the inner circumference. A mounting screw (not shown) is passed through a screw through hole (not shown) provided in the bracket 40a from the side opposite to the side where the bearing fixing member 60a of the bracket 40a is mounted, and the inner circumference of the screw hole 64 of the bearing fixing member 60a is formed. Screw with a female screw. By tightening the mounting screws, the bearing fixing member 60a presses and fixes the bearing 50a to the bracket 40a, and the bearing fixing member 60a is attached to the bracket 40a.

In FIG. 2, the bearing fixing member 60a is a bearing fitting, which is a bottomed hole into which the bearing 50a is fitted , which is formed in a columnar shape so that the bearing 50a is shallowly inserted into the end surface of the bearing fixing member 60a on the bearing 50a side. A hole 66 is provided. The bearing fixing member 60a has a pressing surface 67 in contact with the bearing 50a in the central axial direction at the bottom of the bearing fitting hole 66. The bearing fixing member 60a pushes the bearing 50a toward the bracket 40a in the central axial direction via the pressing surface 67, presses the bearing 50a against the bracket 40a, and fixes the bearing 50a. Specifically, the pressing surface 67 is in contact with the outer ring 51 of the bearing 50a. Further, the bearing fixing member 60a has an inner peripheral surface 661 in contact with the outer peripheral 53 of the bearing 50a on the inner circumference of the side surface of the bearing fitting hole 66. A contact avoidance step 672 is provided on the inner peripheral side of the pressing surface 67 of the bearing fixing member 60a to prevent the bearing fixing member 60a and the inner ring 52 of the bearing 50a from coming into contact with each other. In the first embodiment, the example in which the bearing fixing member 60a has the bearing fitting hole 66 and the inner peripheral surface 661 will be described, but the bearing fixing member 60a does not have the bearing fitting hole 66 and the inner peripheral surface 661. , The pressing surface 67 may be provided on the end surface of the bearing fixing member 60a on the bearing 50a side.

If the bearing fixing member 60a has an inner peripheral surface 661, when mounting the bearing fixing member 60a to the bracket 40a, by the inner circumferential surface 661 for mating with the outer periphery 53 of the bearing 50a, the radial direction of the bearing fixing member 60a Can be easily positioned, and the work efficiency of the bearing fixing member 60a mounting work in bearing replacement can be improved. Further, when the bearing fixing member 60a has a notch portion 62a and an inner peripheral surface 661, the notch portion 62a provides the bearing fixing with flexibility that allows the inner peripheral surface 661 to slightly expand in the direction away from the central axis AX. The member 60a is provided, and the fitability between the inner peripheral surface 661 and the bearing 50a is improved, and the work efficiency of the bearing fixing member 60a mounting work in the bearing replacement can be further improved.

Next, in the rotary electric machine 100a according to the first embodiment of the present disclosure, the rotary electric machine 100a is disassembled to take out a group of members integrated with the rotor 10, and the bearing 50a is pulled out from the shaft 20 by using a drawing tool to remove it. The work will be described. This work is performed by replacing the bearing in the maintenance and inspection of the rotary electric machine 100a.

First, a mounting screw (not shown) for fixing the bracket 40a to the stator structure 30 is removed from the assembled rotary electric machine 100a in FIG. 1, and the bearing fixing member 60a is fixed to the bracket 40a. Remove the mounting screws not shown and remove the bracket 40a from the stator structure 30. Further, a group of members integrated with the rotor 10 including the rotor 10, the shaft 20, the bearing 50a, and the bearing fixing member 60a is taken out from the stator structure 30.

Next, the bearing 50a is pulled out from the shaft 20 and removed. FIG. 5 is a schematic view of the bearing removing operation according to the first embodiment of the present disclosure. In FIG. 5 , the upper side of the central axis AX shows the cross section, and the lower side of the central axis AX shows the appearance. The cross section of the bearing fixing member 60a in FIG. 5 shows a cross section cut along the line AA in FIG.

In FIG. 5 , the shaft 20 is fitted and fixed to the rotor 10. Further, the shaft 20, the inner ring 52 of the bearing 50a is fitted and the bearing 50a is attached, is a state before removing the bearing 50a. A bearing fixing member 60a is arranged between the rotor 10 and the bearing 50a in the central axial direction, and the shaft 20 passes through a shaft through hole 63 provided in the bearing fixing member 60a.

In FIG. 5 , a drawing tool is attached to the shaft end in the direction in which the bearing 50a of the shaft 20 is attached. Drawing tool is a tool to remove pull out the member which is fitted to the shaft 20 from the shaft 20. The drawing tool is also called a puller.

The extraction tool includes a columnar column 910 arranged in the center of the extraction tool, a beam 920 extending from the column 910 in a direction perpendicular to the longitudinal direction of the column 910, and a beam 920 folded from the beam 920 at two tips of the beam 920. It is equipped with two arms 930 rotatably attached in the bending direction. The tip of the arm 930 has a claw 931 that is perpendicular to the longitudinal direction of the arm 930 and protrudes toward the support column 910. One end of the support column 910 has a conical shape, and the conical shape is applied to the center hole 211 of the shaft end surface 21 of the shaft 20, and the support column 910 is rotatable about the central axis AX of the shaft 20 with respect to the shaft 20. A male screw shape is formed on the outer peripheral surface of the side surface of the support column 910. In the center of the beam 920, a hole is provided in which a female screw shape that fits into the male screw shape of the column 910 is formed on the inner circumference. The beam 920 is attached to the support column 910 so that the male thread shape of the support column 910 and the female thread shape of the hole of the beam 920 fit , and when the support column 910 rotates, the beam 920 moves in the longitudinal direction of the support column 910. On the other end side of the support column 910, there is a handle 940 extending in a direction perpendicular to the longitudinal direction of the support column 910. The beam 920 is provided with a mechanism for adjusting the length of the beam (not shown), and the length of the beam 920 is adjusted according to the size of the member to be pulled out.

The bearing fixing member 60a is provided with a notch portion 62a having a shape notched from the outer circumference 61a of the bearing fixing member 60a toward the inside of the bearing fixing member 60a. When the claw 931 of the extraction tool is engaged with the end face of the bearing 50a on the rotor 10 side, the two arms 930 of the extraction tool are bent with respect to the beam 920, so that the claw 931 at the tip of the arm 930 fixes the bearing. The notch 62a of the member 60a and the end face of the bearing 50a on the rotor 10 side enter the space formed, and the claw 931 engages with the end face of the bearing 50a on the rotor 10 side. As described above, even if the gap between the rotor 10 and the bearing 50a in the central axial direction is narrow, the notch 62a is provided in the shaft fixing member 60a, so that a space for engaging the tools is formed and the drawing tool is drawn. The workability of the work of hanging the claw 931 on the bearing 50a is improved, and the work efficiency of the work of removing the bearing 50a can be improved.

After engaging the claw 931 of the extraction tool with the bearing 50a, the support 910 is rotated by the handle 940 of the extraction tool, so that the beam 920 and the arm 930 move in the direction away from the rotor 10, and the arm 930 is moved accordingly. The bearing 50a with which the claw 931 at the tip is engaged also moves on the shaft 20 in a direction away from the rotor 10, and the bearing 50a is pulled out from the shaft 20 and removed.

The distance L1 between the notch end 623a, which is the portion closest to the central axis AX of the notch portion 62a, and the central axis AX is smaller than the radius L2 of the outer circumference 53 of the bearing 50a. As a result, a part of the end surface of the bearing 50a on the bearing fixing member 60a side is exposed in the space formed by the notch 62a. This creates a surface region on the end surface of the bearing 50a on the bearing fixing member 60a side on which the claw 931 of the drawing tool can be engaged, and makes it easy to engage the claw 931 of the drawing tool on the bearing 50a. As a result, the work efficiency of the bearing 50a removal work can be improved.

The distance L1 between the notch end 623a, which is the portion closest to the central axis AX of the notch portion 62a, and the central axis AX is larger than the radius L3 of the shaft through hole 63. As a result, since the notch portion 62a has not reached the shaft through hole 63, the shaft through hole 63 is a hole closed in the circumferential direction, and if the shaft 20 is passed through the shaft through hole 63, the bearing fixing member 60a will be formed. The bearing fixing member 60a does not fall from the shaft 20 during the bearing removal work because the shaft 20 does not come off from the side of the shaft 20. Therefore, the work efficiency of the bearing removal work can be improved.

The notch width H of the notch portion 62a of the bearing fixing member 60a is set to be longer than the width of the claw 931 of the drawing tool determined by the size of the bearing 50a.

Further, the number of notched portions 62a provided in the bearing fixing member 60a is 2. The number of claws 931 of a general drawing tool is often 2, and by reducing the number of notches 62a to the minimum necessary 2, the contact area of the pressing surface 67 where the bearing 50a and the bearing fixing member 60a come into contact can be reduced. The number can be increased, and the load per unit area applied to the bearing 50a can be dispersed. This makes it possible to improve the reliability of the bearing 50a and the bearing fixing member 60a. Further, by minimizing the number of the notch portions 62a, the processing cost required for processing the notch portions 62a can be suppressed.

In the first embodiment of the present disclosure, as described above, the stator structure 30 having the rotor 31 and the frame 32 which is the stator support portion for supporting the stator 31 and the bracket attached to the stator structure 30. 40a, a bearing 50a arranged on the bracket 40a, a shaft 20 rotatably supported by the bearing 50a, a rotor 10 fixed to the shaft 20, and arranged between the bearing 50a and the rotor 10. A shaft through hole 63 attached to the bracket 40a and closed in the circumferential direction through which the shaft 20 passes is provided, and a bearing fixing member 60a for pressing and fixing the bearing 50a to the bracket 40a is provided. The bearing fixing member 60a is a bearing fixing member 60a. A notch portion 62a having a shape notched from the outer circumference 61a of the bearing toward the inside of the bearing fixing member 60a is provided, and the portion of the notch portion 62a closest to the central axis AX and the central axis AX are in the radial direction. The distance L1 is smaller than the radius L2 of the outer peripheral 53 of the bearing 50a, and is larger than the radial distance L3 between the central axis AX and the part farthest from the central axis AX on the inner circumference of the shaft through hole 63. The work efficiency of the bearing removal work can be improved without the bearing fixing member 60a falling from the shaft.

Further, since the number of notches 62a provided in the bearing fixing member 60a is 2, the contact area between the bearing 50a and the bearing fixing member 60a is large, and the load per unit area applied to the bearing 50a can be dispersed. This makes it possible to improve the reliability of the bearing 50a and the bearing fixing member 60a. Further, the processing cost required for processing the notch portion 62a can be minimized.

Embodiment 2.
FIG. 6 is an external view of the bearing fixing member according to the second embodiment of the present disclosure. In FIG. 6 , those having the same reference numerals as those in FIG. 2 indicate the same or corresponding configurations, and the description thereof will be omitted. FIG. 6 shows the appearance of the bearing fixing member 60b as viewed from the direction of the bearing 50a in the central axis direction when the bearing fixing member 60b is arranged in the rotary electric machine. The bearing fixing member 60a according to the first embodiment of the present disclosure has four notches 62a provided in the bearing fixing member 60b, and the number of notches 62a is such that the bearing fixing member 60b is used as a bracket. The difference is that the number is the same as the number of the plurality of screw holes 64 provided in the bearing fixing member 60b for mounting.

In the bearing fixing member 60b of FIG. 6 , four screw holes 64 and four notch portions 62a, which are the same as the number of screw holes 64, are alternately spaced in the circumferential direction at equal intervals in the circumferential direction about the central axis AX. Is placed in.

The force with which the mounting screw presses the bearing fixing member 60b in the screw hole 64 in the direction of the bracket 40a transmits the structure of the bearing fixing member 60b, and the bearing fixing member 60b presses the bearing 50a on the pressing surface 67 in the circumferential direction of the load. Is the distribution of. In the present embodiment in which the number of notches 62a and the number of screw holes 64 are the same, the bearing fixing member 60b is pressed on the pressing surface 67 as compared with the case where the number of notches 62a and the number of screw holes 64 are different. The circumferential distribution of the load holding the bearing 50a does not differ between the adjacent screw holes 64, and the variation in the circumferential distribution of the load can be suppressed.

Even in the rotary electric machine of the second embodiment provided with such a bearing fixing member 60b, the shaft through hole 63 is closed in the circumferential direction as in the first embodiment, and the bearing fixing member 60b is the shaft 20. The bearing fixing member 60b does not fall from the shaft 20 during the bearing removal work because it does not come off from the shaft 20 sideways. Further, the notch 62a provided in the bearing fixing member 60b makes it easy to engage the claw 931 of the drawing tool with the bearing 50a, and the work efficiency of the removal work of the bearing 50a can be improved.

Further, since the bearing fixing member 60b is provided with a plurality of screw holes 64 for attaching to the bracket 40a and the number of notches 62a is the same as the number of the screw holes 64, the bearing fixing member 60b is a bearing. The variation in the distribution of the load that presses 50a in the circumferential direction can be suppressed, the bearings can be pressed evenly, and the quality of the rotary electric machine 100a can be improved.

Embodiment 3.
FIG. 7 is an external view of the bearing fixing member according to the third embodiment of the present disclosure. In FIG. 7 , those having the same reference numerals as those in FIG. 2 indicate the same or corresponding configurations, and the description thereof will be omitted. FIG. 7 shows the appearance of the bearing fixing member 60c as seen from the direction of the bearing 50a in the central axis direction when the bearing fixing member 60c is arranged in the rotary electric machine. The bearing fixing member 60a according to the first embodiment of the present disclosure has a notch portion 62c outside a polygon formed by a plurality of straight lines connecting the centers of screw holes 64 adjacent to each other in the circumferential direction. That is different. Further, the number of notched portions 62c provided in the bearing fixing member 60c is set to 4.

In FIG. 7 , the screw hole reference line 641 which is a straight line connecting the centers of the screw holes 64 adjacent to each other in the circumferential direction is shown by a dotted line, and is a polygon composed of a plurality of screw hole reference lines 641. A reference line polygon 642 is shown. In FIG. 7 , the bearing fixing member 60c is provided with four screw holes 64, and the reference line polygon 642 is a quadrangle.

The notch portion 62c is located outside the reference line polygon 642 when the bearing fixing member 60c is viewed from the bearing 50a side in the direction in which the central axis AX extends. In other words, the surface forming the notch 62c is outside the reference line polygon 642. That is, the two notch side surfaces 621c and the notch end surface 622c constituting the notch portion 62c are outside the reference line polygon 642.

Since the notch 62c is outside the reference line polygon 642 composed of a plurality of inter-thread reference lines 641 connecting the centers of the screw holes 64 adjacent to each other in the circumferential direction, the notch 62c is formed. The space to be formed does not intersect the inside of the reference line polygon 642. That is, the portion of the bearing fixing member 60c along the screw hole reference line 641 between the adjacent screw holes 64 has a structure in which the material constituting the bearing fixing member 60c is filled without being chipped. As a result, the rigidity between the screw holes 64 adjacent to each other in the circumferential direction of the bearing fixing member 60c is increased, the distortion of the bearing fixing member 60c is small, and the force applied from the mounting screws is reliably pressed by the plurality of screw holes 64. The bearing 50a can be uniformly and entirely pressed by being transmitted to the entire surface 67, and the variation in the distribution of the load in which the bearing fixing member 60c presses the bearing 50a in the circumferential direction can be suppressed.

Even in the rotary electric machine of the third embodiment provided with such a bearing fixing member 60c, the shaft through hole 63 is closed in the circumferential direction as in the first embodiment, and the bearing fixing member 60c is the shaft 20. The bearing fixing member 60c does not fall from the shaft 20 during the bearing removal work because it does not come off from the shaft 20 sideways. Further, the notch 62c provided in the bearing fixing member 60c makes it easy to engage the claw 931 of the drawing tool with the bearing 50a, and the work efficiency of the removal work of the bearing 50a can be improved.

Further, the bearing fixing member 60c is provided with three or more screw holes 64 for attaching to the bracket 40a, and the notch 62c is viewed from the bearing 50a side in the direction in which the central axis AX extends in the notch portion 62c. Since it is outside the reference line polygon 642 composed of the reference line 641 between screw holes, which is a plurality of straight lines connecting the centers of the screw holes 64 adjacent to each other in the circumferential direction, the circumferential direction in the bearing fixing member 60c. The rigidity between the adjacent screw holes 64 is increased, the bearing 50a can be pressed evenly as a whole, the variation in the distribution of the load in which the bearing fixing member 60c presses the bearing 50a in the circumferential direction is suppressed, and the rotary electric machine is used. The quality of 100a can be improved.

Embodiment 4.
FIG. 8 is a cross-sectional view showing a rotary electric machine according to the fourth embodiment of the present disclosure. FIG. 9 is an external view of the bearing fixing member according to the fourth embodiment of the present disclosure. FIG. 10 is a schematic view of the bearing removing operation according to the fourth embodiment of the present disclosure. In FIGS. 8 and 10, the upper side of the central axis AX shows the cross section, and the lower side of the central axis AX shows the appearance. In FIGS. 8, 9, and 10, those having the same reference numerals as those in FIGS. 1, 2, and 5 indicate the same or corresponding configurations, and the description thereof will be omitted. With respect to the bearing fixing member 60a according to the first embodiment of the present disclosure, the bearing fixing member 60d is not provided with a notch, and the radius L4 of the outer circumference 61d of the bearing fixing member 60d is the radius of the outer circumference 13 of the rotor 10. The difference is that a protruding portion 68 is provided, which is larger than L5 and the radial distance of the bearing fixing member 60d from the central axis of the shaft 20 is larger than the radius L5 of the outer circumference 13 of the rotor 10. ing.

In FIG. 8, the bearing fixing member 60d of the fourth embodiment of the present disclosure is arranged between the bearing 50a and the rotor 10 in the central axial direction and attached to the bracket 40a, as in the first embodiment. .. The bearing fixing member 60d holds the bearing 50a against the bracket 40a and fixes it. The shaft 20 passes through the shaft through hole 63 provided in the bearing fixing member 60d. The radius L4 of the outer circumference 61d of the bearing fixing member 60d is larger than the radius L5 of the outer circumference 13 of the rotor 10, unlike the first embodiment.

FIG. 9 shows the appearance of the bearing fixing member 60d as seen from the direction of the bearing 50a in the central axis direction when the bearing fixing member 60d is arranged in the rotary electric machine 100d. In FIG. 9, the outer circumference 13 of the rotor 10 is shown by a dotted line. In FIG. 9, the bearing fixing member 60d does not have a shape notched from the outer circumference to the inside, and has a disk-like shape. The radius L4 of the outer circumference 61d of the bearing fixing member 60d is larger than the radius L5 of the outer circumference 13 of the rotor 10. That is, a protruding portion 68 is provided, which is a portion in which the distance in the radial direction of the shaft 20 of the bearing fixing member 60d from the central axis AX is larger than the radius L5 of the outer circumference 13 of the rotor 10. In FIG. 9, the bearing fixing member 60d is a protruding portion 68 having a disk-shaped outer circumference covering the entire circumference and a radial distance from the central axis AX larger than the radius L5 of the outer circumference of the rotor 10. Further, the bearing fixing member 60d is provided with a shaft through hole 63 and four screw holes 64. Similar to the first embodiment, the shaft through hole 63 is closed in the circumferential direction, the bearing fixing member 60d does not come off from the shaft 20 on the side of the shaft 20, and the bearing fixing member 60d is in the middle of the bearing removal work. It does not fall from the shaft 20.

In FIG. 10, the bearing fixing member 60d is arranged between the bearing 50a and the rotor 10 in the central axial direction, and the shaft 20 passes through the shaft through hole 63 of the bearing fixing member 60d. The protruding portion 68, which is a portion where the radial distance from the central axis AX is larger than the radius L5 of the outer circumference 13 of the rotor 10, protrudes outward in the radial direction from the rotor 10. Since the protruding portion 68 protrudes radially outward from the rotor 10, even if the gap between the bearing fixing member 60d and the rotor 10 is narrow, the end face of the protruding portion 68 on the rotor 10 side is in the radial direction of the rotor 10. It is exposed in the outer space.

In FIG. 10, a drawing tool is attached to the shaft end in the direction in which the bearing 50a of the shaft 20 is attached.

In the fourth embodiment of the present disclosure, in the work of pulling out the bearing 50a from the shaft 20 using the pulling tool and removing the bearing 50a, the claw 931 of the pulling tool engages with the end face of the protrusion 68 of the bearing fixing member 60d on the rotor 10 side. Let me. The pulling force from the pulling tool is transmitted from the engaged protrusion 68 to the bearing 50a via the bearing fixing member 60d, and the bearing 50a is pulled out and removed together with the bearing fixing member 60d. When the claw 931 of the drawing tool is engaged with the protruding portion 68, the claw 931 at the tip of the arm 930 forms the end surface of the protruding portion 68 of the bearing fixing member 60a on the rotor 10 side and the outer peripheral surface of the rotor 10. Entering the space, the claw 931 engages with the end face of the protruding portion 68 on the rotor 10 side. As described above, even if the gap between the rotor 10 and the bearing 50a in the central axial direction is narrow, the protrusion 68 is provided on the shaft fixing member 60d, so that a space for engaging the tools is formed, and the drawing tool can be used. The workability of the work of hanging the claw 931 is improved, and the work efficiency of the work of removing the bearing 50a can be improved.

After the claw 931 of the extraction tool is engaged with the bearing fixing member 60d, the column 910 is rotated by the handle 940 of the extraction tool, so that the beam 920 and the arm 930 move in the direction away from the rotor 10 in the central axis direction. Along with this, the bearing fixing member 60d on which the claw 931 at the tip of the arm 930 engages and the bearing 50a adjacent to the bearing fixing member 60d move in a direction away from the rotor 10 in the central axial direction with respect to the shaft 20. The bearing 50a is pulled out from the shaft 20 and removed.

In the fourth embodiment of the present disclosure, as described above, the stator structure 30 having the rotor 31 and the frame 32 which is the stator support portion for supporting the stator 31 and the bracket attached to the stator structure 30. 40a, a bearing 50a arranged on the bracket 40a, a shaft 20 rotatably supported by the bearing 50a, a rotor 10 fixed to the shaft 20, and arranged between the bearing 50a and the rotor 10. A shaft through hole 63 that is attached to the bracket 40a and closed in the circumferential direction through which the shaft 20 passes is provided, and includes a bearing fixing member 60d that presses and fixes the bearing 50a to the bracket 40a. The bearing fixing member 60d is a bearing fixing member. Since the protruding portion 68 is provided so that the radial distance of the shaft 20 of the 60d from the central axis AX is larger than the radius L5 of the outer circumference of the rotor 10, the bearing fixing member 60d falls from the shaft 20. It is possible to improve the work efficiency of the bearing removal work.

Further, it is not necessary to provide a notch in the bearing fixing member 60d, and the contact area of the pressing surface 67 in which the bearing 50a and the bearing fixing member 60d come into contact increases, so that the load per unit area applied to the bearing 50a is increased. It can be dispersed, and the reliability of the bearing 50a and the bearing fixing member 60d can be improved. Further, it is not necessary to process the notch portion, and the processing cost can be suppressed.

In the fourth embodiment, the outer shape of the bearing fixing member 60d is disk-shaped, and the radial distance from the central axis AX over the entire circumference of the disk-shaped outer circumference is from the radius L5 of the outer circumference of the rotor 10. Although described in the example of a large protruding portion 68, a part of the outer periphery may be a protruding portion 68 whose radial distance from the central axis is larger than the radius L5 of the outer circumference of the rotor 10. .. When a part of the outer circumference is a protruding portion 68, the mass of the bearing fixing member 60d is smaller than that when the outer circumference is a protruding portion 68 over the entire circumference, and the weight of the rotary electric machine 100d is reduced. Become. When the outer shape of the bearing fixing member 60d is a disk shape and the outer circumference of the disk shape is a protruding portion 68 over the entire circumference, the outer shape of the bearing fixing member 60d can be easily processed, the processing cost can be suppressed, and production can be performed. The sex can be improved.

In each embodiment of the present disclosure, the example in which the stator structure 30 is composed of the stator 31 and the frame 32 has been described, but the stator structure 30 is composed of the stator 31 and the resin that molds the stator 31. The stator 31 may be supported by the molded resin, and the bracket 40a may be attached to the molded resin. Further, the stator structure 30 is composed of only the stator 31, and the bracket 40a may be directly attached to the stator 31. If the stator structure 30 is composed of only the stator 31, the stator 31 and the like stator 31 is fitted directly supported on the apparatus such that the rotary electric machine is used, the stator 31 is a stator support Also serves as a department.

In each embodiment of the present disclosure, the rotary electric machine has been described as an induction motor, but it may be a servo motor having a magnet in the rotor, a reluctance motor driven by a reluctance torque, or the like.

In each embodiment of the present disclosure, the outer shape of the bearing fixing members 60a, 60b, 60c, 60d has a disk-like shape having an outer circumference that is an arc centered on the central axis AX when viewed from the direction of the central axis AX. As described in the example, in the bearing fixing member, the distance between the part farthest from the central axis AX on the outer circumference and the central axis AX is larger than the radius L2 of the outer circumference 53 of the bearing 50a, and the bearing 50a is pressed by the bracket 40a. As long as the fixing member has a shape that can be attached to the bracket 40a, the outer circumference may be a polygonal plate shape when viewed from the central axis direction. When the outer shape of the bearing fixing member viewed from the central axis direction is arcuate, deformation distortion on the outer circumference of the bearing fixing member is suppressed, and variation in the circumferential direction of the force distribution of the bearing fixing member holding the bearing 50a is suppressed. be able to.

In each embodiment of the present disclosure, the bearing 50a has been described as an example of a bearing, but a slide bearing or the like may be used.

In each of the embodiments of the present disclosure, the bearing fixing members 60a, 60b, 60c, 60d are installed only in one bearing 50a of the two bearings, and are not installed in the other bearing 50b. May be installed on the bearings 50a and 50b of the above.

In the present disclosure, each embodiment can be freely combined, and each embodiment can be appropriately modified or omitted within the scope of the disclosure.

10 rotor, 11 rotor core, 12 end ring, 13 rotor outer circumference, 20 shaft, 21 shaft end face, 30 stator structure, 31 stator, 32 frame, 40a, 40b bracket, 50a, 50b bearing, 53 bearing outer circumference , 60a, 60b, 60c, 60d Bearing fixing member, 61a, 61d Bearing fixing member outer circumference, 62a, 62c Notch, 63 Shaft through hole, 64 Thread hole, 66 Bearing fitting hole, 67 Pressing surface, 68 Protruding part, 100a, 100d rotary electric machine, 211 center hole, 621a, 621c notched side surface, 622a, 622c notched end surface, 623a, 623c notched end, 641 screw hole reference line, 642 reference line polygon, 661 inner peripheral surface, 672 Contact avoidance step, 910 stanchion, 920 bearing, 930 arm, 931 claw, 940 handle, AX central axis

Claims (4)

A stator structure having a stator and a stator support portion that supports the stator, and a stator structure.
The bracket attached to the stator structure and
The bearings placed on the bracket and
A shaft rotatably supported by the bearing and
The rotor fixed to the shaft and
A bearing fixing member that is arranged between the bearing and the rotor and is attached to the bracket, is provided with a shaft through hole that is closed in the circumferential direction through which the shaft passes, and presses and fixes the bearing to the bracket. Prepare,
The bearing fixing member has a first surface facing the rotor and a second surface facing the bearing, and the first surface from the outer periphery of the bearing fixing member toward the inside of the bearing fixing member . A notch portion having a notched shape is provided so as to penetrate from the surface to the second surface.
The radial distance between the notch portion closest to the central axis of the shaft and the central axis is smaller than the radius of the outer circumference of the bearing and is from the central axis on the inner circumference of the shaft through hole. farthest point and much larger than the radial distance between the center axis, the rotary electric machine the end surface of the bearing in the notch is characterized by exposed. The bearing fixing member is provided with a plurality of screw holes for attaching to the bracket.
The rotary electric machine according to claim 1, wherein the number of the cutouts is the same as the number of the plurality of screw holes. The rotary electric machine according to claim 1, wherein the number of notched portions is 2. The bearing fixing member is provided with three or more screw holes for attaching to the bracket.
The notch is a polygonal shape formed by a plurality of straight lines connecting the centers of the screw holes adjacent to each other in the circumferential direction when the bearing fixing member is viewed from the bearing side in the direction in which the central axis extends. The rotary electric machine according to any one of claims 1 to 3, wherein the rotary electric machine is located on the outside.

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