KR100504921B1 - Shaft for induction motor - Google Patents

Abstract

The present invention relates to a rotating shaft of an induction motor, comprising: a rod-shaped rotating shaft main body rotatably coupled to an axis of a rotor core; It is coupled to both sides of the rotor core along the longitudinal direction of the rotary shaft body integral with the rotary shaft body so as to protrude along the radial direction of the rotary shaft body to suppress the bearings that support the rotary shaft body from approaching each other. It characterized in that it comprises a bearing stopper formed with. Thereby, the rotational shaft of the induction motor can be provided which eliminates the use of the stop ring for fixing the position of the bearing, thereby reducing the number of input parts and suppressing the occurrence of the defective position of the bearing.

Description

SHAFT FOR INDUCTION MOTOR}

The present invention relates to a rotating shaft of an induction motor, and more particularly, an induction motor which can reduce the number of input parts and suppress occurrence of bearing position by eliminating the use of a stop ring for fixing a position of a bearing. Relates to the axis of rotation.

1 is a view showing a rotor of a conventional induction motor, Figure 2 is an exploded perspective view of the bearing area of FIG. As shown in these figures, the rotor of the induction motor has a rotor core 11 rotatably disposed with a predetermined gap inside the stator, not shown, and the rotor along the axis of the rotor core 11. The rotating shaft 21 is rotatably coupled to the core 11 integrally.

The rotor core 11 includes a plurality of electrical steel sheets 12 that are insulated and stacked with a shaft hole 13a penetrated so that the rotation shaft 21 can be accommodated in the center and a plurality of slots 13b formed on a circumferential surface thereof. And a plurality of conductor bars 15 formed in the slot 13b of the electrical steel sheet 12, and end rings 17 integrally formed with the conductor bars 15 at both ends of the laminated electrical steel sheet 12. Equipped with. Each outer surface of the end ring 17 is formed with a plurality of blades 18 protruding along the axial direction and spaced apart from each other along the circumferential direction.

On the other hand, a pair of bearings 19 are coupled to both sides of the rotor core 11 along the longitudinal direction of the rotation shaft 21 so as to rotatably support the rotation shaft 21, and the rotor core 11 The stop ring 23 is coupled between the bearing 19 and the bearing 19 so as to maintain a constant distance from each other.

The stop ring 23 is a so-called release type (E type) stop ring having one side open with an elastic member, and the coupling shaft 22 is formed on the rotating shaft 21 to allow the stop ring 23 to be inserted and coupled thereto. have.

By the way, in the rotor of the conventional induction motor, in order to ensure that the bearings 19 maintain a constant distance from each other, the coupling groove 22 which is recessed in the radial axis in the radial direction and extends in the circumferential direction is formed. And the stop ring 23 is coupled to the coupling groove 22, so that the number of input parts and assembly labor is increased, the cost is increased, and the stop ring 23 is incompletely inserted to stop the ring 23. ) Is separated from the rotating shaft 21, there is a problem that a poor position of the bearing 19 occurs.

Accordingly, it is an object of the present invention to provide a rotating shaft of an induction motor which can reduce the number of input parts by suppressing the use of the stop ring for fixing the position of the bearing and can suppress the occurrence of a poor position of the bearing.

According to the present invention, there is provided a rod-shaped rotating shaft main body rotatably coupled to the shaft center of the rotor core; It is coupled to both sides of the rotor core along the longitudinal direction of the rotary shaft body integral with the rotary shaft body so as to protrude along the radial direction of the rotary shaft body to suppress the bearings that support the rotary shaft body from approaching each other. It is achieved by the rotation axis of the induction motor, characterized in that it comprises a bearing stopper formed with.

Here, the bearing stopper is preferably formed by caulking the rotating shaft body.

It is effective that grooves extending along the circumferential direction are formed on each side of the bearing stopper in the radial direction of the rotating shaft body.

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

3 is a view showing a state of use of the rotary shaft of the induction motor according to an embodiment of the present invention, Figure 4 is a view showing a bearing stopper region of the rotary shaft of Figure 3, Figure 5 is a bearing stopper region of Figure 4 6 is a cross-sectional view taken along line VI-VI of FIG. 5, and FIG. 7 is a view for explaining formation of the bearing stopper of FIG. 3. The same and equivalent parts as those described above and shown in the drawings will be described with the same reference numerals for convenience of description. As shown in these figures, the rotor of the induction motor has a rotor core 11 insulated and laminated with a plurality of electrical steel sheets 12 having a shaft hole 13a and a plurality of slots 13b, and a rotor core ( A conductor bar 15 formed in each slot 13b of 11) and end rings 17 disposed at both ends of the rotor core 11, respectively. Rotating shaft 31 of the induction motor according to an embodiment of the present invention is coupled.

 The rotary shaft 31 of the induction motor includes a rotary shaft main body 32 which is rotatably inserted and integrally coupled to the rotor core 11 along an axis of the rotor core 11 and an axial direction of the rotary shaft main body 32. The bearing 19 disposed on both sides of the rotor core 11 is configured to include a bearing stopper 34 integrally formed on the rotating shaft body 32 so as to maintain a predetermined distance from each other.

The rotating shaft main body 32 is formed in the shape of a rod having a predetermined diameter, and bearing stoppers 34 are formed on both sides of the rotor core 11 so that the bearing 19 can maintain a predetermined interval.

Each bearing stopper 34 protrudes in the radial direction on the circumferential surface of the rotation shaft body 32 and forms a pair protruding from each other along the radial direction, and the rotation shaft body 32 inside the bearing stopper 34. Grooves 36 are formed, each recessed along the radial direction of and extending along the circumferential direction so that the cross section of the bearing stopper 34 can be formed at a relatively constant position.

As shown in FIG. 7, the bearing stopper 34 has a yaw cross section having pressing surfaces 42 and 46 of a pair of right angled cross sections spaced apart from each other to correspond to the diameter of the rotating shaft main body 32. It is formed by a caulking device having an upper punch 41 and a lower die 45 of a shape.

By such a configuration, when grooves 36 are formed in both end regions of the rotation shaft body 32, the rotation shaft body 32 is inserted into and coupled to the shaft center of the rotor core 11. Next, the rotary shaft main body 32 to which the rotor core 11 is coupled is placed on the lower die 45, and the upper punch 41 is lowered so that the upper punch 41 approaches the lower die 45. A part of the circumferential surface of the 32 is projected outwardly along the radial direction between the upper punch 41 and the lower die 45, respectively, and plastically deforms to form the bearing stopper 34. When the bearing stopper 34 is formed, each bearing 19 may be inserted into and coupled at both ends of the rotation shaft main body 32.

As described above, according to the present invention, the rod-shaped rotary shaft main body is rotatably inserted into the shaft core of the rotor core and radial direction from the circumferential surface of the rotary shaft main body at a predetermined distance from each other along the longitudinal direction of the rotary shaft main body. By having a bearing stopper formed integrally with the rotating shaft main body to protrude along, unlike the conventional use of a separate stop ring to maintain a constant distance between the bearings, the use of the stop ring can be excluded The rotation shaft of the induction motor is provided, which can reduce the number of the assembly and the number of assembly work, and can reduce the cost, and can suppress the occurrence of the stop ring and the deviation of the bearing position due to the incorrect assembly of the stop ring.

1 is a view showing a rotor of a conventional induction motor,

2 is an exploded perspective view of the bearing area of FIG. 1, FIG.

3 is a view showing a state of use of the rotating shaft of the induction motor according to an embodiment of the present invention,

4 is a view showing a bearing stopper region of the rotating shaft of FIG.

5 is a plan view of the bearing stopper region of FIG.

6 is a cross-sectional view taken along line VI-VI of FIG. 5,

7 is a view for explaining the formation of the bearing stopper of FIG.

Explanation of symbols on the main parts of the drawings

11: rotor core 12: electrical steel sheet

15: conductor bar 17: end ring

32: rotating shaft main body 34: bearing stopper

36 groove

Claims (3)

A rod-shaped rotating shaft body which is rotatably coupled to the shaft center of the rotor core; It is coupled to both sides of the rotor core along the longitudinal direction of the rotary shaft body integral with the rotary shaft body so as to protrude along the radial direction of the rotary shaft body to suppress the bearings that support the rotary shaft body from approaching each other. Rotation axis of the induction motor, characterized in that it comprises a bearing stopper formed with. The method of claim 1, The bearing stopper is a rotating shaft of the induction motor, characterized in that formed by caulking the rotating shaft body. The method according to claim 1 or 2, Each one side of the bearing stopper is a rotation shaft of the induction motor, characterized in that grooves are formed in the radial direction of the rotary shaft body and extend along the circumferential direction.