JPH0588059B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an electric motor used to drive blower blades of electric fans, ventilation fans, air conditioners, and the like.

(b) Prior Art As a technology prior to the present invention, there is an electric motor described in the following publication.

First, in Japanese Utility Model Publication No. 55-52785, positioning is performed by forming a stepped portion on the rotating shaft and bringing a positioning ring into contact with the stepped portion, but there is no space between the positioning ring and the rotating shaft. If there is slippage, abnormal noise is generated, and if the positioning ring body is inserted too tightly into the rotating shaft, the rotating shaft is scratched, and abnormal noise is generated between the rotating shaft and the bearing.

Furthermore, in Japanese Patent Publication No. 57-31389, positioning is performed by bringing the positioning ring into contact with the end face of the rotor, but the positioning ring only comes into contact with the rotor and there is no fixed relationship. This causes slippage and abnormal noise.

(c) Problems to be Solved by the Invention A technical problem of the present invention is to provide an electric motor in which the positioning of the rotating shaft is performed reliably, no abnormal noise is generated, and the positioning ring can be smoothly attached. That is.

(d) Means for Solving the Problems The present invention provides a positioning ring body in which a rotary shaft is inserted and fixed in the center of a rotor made by laminating and bonding a plurality of iron plates, and the rotor is positioned with respect to a bearing that pivotally supports the rotary shaft. In an electric motor that is inserted into a rotating shaft, the proximal end of the rotating shaft that protrudes from the rotor is the final polished part, the distal end of the final polished part that is inserted into the bearing and supported by the bearing is the polished part, and the inner diameter of the positioning ring is The problem can also be solved by forming the outer diameter of the polished part to be larger than the outer diameter of the polished part and smaller than the outer diameter of the final polished part.

The positioning ring body may be a wide cylindrical body, and the end surface on the rotor side may be brought into contact with the rotor. A housing recess for a buffer or thrust adjusting washer may be formed on the end surface of the positioning ring on the bearing side to hold the washer.

(e) Function The present invention provides that when the positioning ring is inserted into the rotating shaft, the inner surface of the positioning ring is not pressed against the polishing part while the polishing part is sliding, and the positioning ring is not pressed against the polishing part in the final polishing part. is pressed and fixed.

(F) Embodiment The present invention will be explained by embodying the configuration based on an electric motor 1 used for an electric fan.

The electric motor 1 has the structure shown in the sectional view shown in FIG. 1, and includes a cup-shaped front case 2 and a rear case 3 formed by press-molding sheet metal, and a fixed case that is press-fitted and supported in the front case 2 and the rear case 3. 4, a rotor 8 into which a rotary shaft 7 supported by bearings 5 and 6 at the center of the front case 2 and rear case 3 is inserted and fixed, and a swinging gear device 9 attached to the rear of the rear case 3 The rear case 3 includes an oscillating rotation support shaft 10 hanging from the lower surface of the rear case 3.

The gear device 9 has a gear lower case 11 fixed to the rear surface of the rear case 3 and a gear upper case 12, and a worm wheel 13 on the upper and lower cases 11 and 12.
It has a clutch gear shaft 14 that rotates by being engaged with and disengaged from the worm wheel 13 as appropriate, a crank gear 16 that meshes with a gear portion 15 of the clutch gear shaft 14, and an oscillating link 17 whose one end is pivotally supported by the crank gear 16. . The worm wheel 13 is attached to the rear case 3
It meshes with a worm formed at the rear end of the rotating shaft 7 that protrudes into the gear device 9.

A housing cylinder part 21 for the bearing 5 is formed in the center of the front case 2, and the bearing 5 stored in the housing cylinder part 21 is biased into the housing cylinder part 21 by a bearing presser spring body 22. Cylindrical oil caps 23 and 24 are attached to the outer surface and inner surface of the cylindrical housing portion 21 of the front case 2. An oil cutter 25 is attached to the portion of the rotating shaft 7 covered by the outer oil cap 23.

A cylindrical housing part 26 for the bearing 6 is formed in the center of the rear case 3, and the bearing 5 housed in the cylindrical housing part 26 is biased into the cylindrical housing part 26 by a bearing pressing spring body 27.
A cylindrical oil cap 28 is attached around the inner surface of the storage cylinder part 26 of the rear case 3. Storage cylinder part 26
An oil cutter 29 is attached to a portion of the rotating shaft 7 that is covered by the outer side of the rotary shaft 7.

The stator 4 is formed by laminating a plurality of iron plates each having an insertion hole for the rotor 8 and a slot in which the winding 31 is inserted into the insertion hole. The steel plates are formed by punching and are laminated one after another at the same time as the punching.

The rotor 8 is formed by laminating a plurality of iron plates each having an insertion hole in the center for the rotation shaft 7 and an inlet around the periphery into which aluminum flows to form a rotating cage. The iron plates are formed by punching out sheet metal, and at the same time as the punching, they are sequentially laminated to form the rotor core. The rotor core is then die-cast aluminum around it. As shown in FIG. 2, the rotor 8 is assembled by first inserting the rotating shaft 7, and then caulking the end surface A of the rotor 8 around the inserted portion of the rotating shaft 7.
and the rotating shaft 7 are connected and fixed. During this caulking, the contact portion of the rotating shaft 7 with the rotor 8 is slightly raised in the direction of the rotating shaft 7 to form a burr.

Next, the rotating shaft 7 is rotated by a chuck to cut the circumferential surface B of the rotor 8. At this time, a worm is formed at the rear end of the rotating shaft 7, a threaded portion 32 into which a fan fixing spinner is screwed is formed at the tip, and a hole into which a fan rotation prevention pin 33 is inserted is formed in the middle of the tip. form.

Furthermore, in order to eliminate scratches from the chuck that rotates the rotating shaft 7 and bends and scratches when the rotor 8 is caulked, the rotating shaft 7 is fixed at the end and rotated, and the circumference of the rotating shaft 7 is Grind. During this polishing, the proximal end portion of the rotating shaft 7 from the rotor 8 is not polished to form the final polished portion 34, and the distal end side of the final polished portion 34 is polished to form the polished portion 35.

As shown in FIGS. 1 and 4, the rotating shaft 7 is provided with a positioning ring 36, a buffer washer 37, and a thrust washer 3 for adjusting the slice of the rotating shaft.
Insert 8. The positioning ring 36 is formed of a cylindrical body, and has an inner diameter larger than the outer diameter of the polishing section 35 and smaller than the outer diameter of the final polishing section 34 . When the positioning ring 36 is fitted onto the rotating shaft 7 and the polishing part 35 is slid, it does not come into pressure contact with the circumferential surface of the polishing part 35 and cannot be scratched. When the positioning ring body 36 is fitted onto the polished portion 34, they are pressed into contact with each other, and the rotating shaft 7 and the positioning ring body 36 are integrated. When the positioning ring body 36 is press-fitted into the end-polishing portion 34, the end portion thereof comes into contact with the end surface portion A of the rotor 8. The inner diameter of the positioning ring 36 on the side that comes into contact with the end surface A is larger than the outer diameter of the end-polished part 34, and a space is formed between the positioning ring 36 and the outer surface of the end-ground part 34. The burrs on the end face A of the rotor 8 are released. The shape of the final polishing part 34 is determined by the positioning ring 3.
The length is approximately equal to that of 6.

A recess 39 is formed in the end surface of the positioning ring 36 on the distal end side of the rotating shaft 7 . A buffer washer 37 is accommodated and fitted into the recess 39 . Buffer washer 37
Insert the thrust washers 38 in an overlapping manner.
The thrust washer 38 is shown in FIG.
If the distance from 6 is large, a thrust washer is additionally inserted to adjust the thrust.

(G) Effects of the Invention The present invention prevents the occurrence of abnormal noise during rotation of the electric motor by not damaging the polished portion supported by the bearing when inserting the positioning ring into the rotating shaft. When it is inserted into the polished part, it forms a pressure contact and rotates together with the rotating shaft without slipping, which prevents the generation of abnormal noise and makes it suitable for use as an electric motor.

[Brief explanation of the drawing]

The figures show the present invention, with Figure 1 being a right sectional view and Figure 2 being a right sectional view.
Figures 3 and 4 are sectional views of essential parts showing the process of forming the rotor and the rotating shaft. 1...Electric motor, 2...Front case, 3...Rear case,
5, 6...bearing, 7...rotating shaft, 8...rotor, 34...
End polishing part, 35... Polishing part, 36... Positioning ring.

Claims (1)

[Claims] 1. In an electric motor, a rotating shaft is inserted and fixed in the center of a rotor made of a plurality of laminated iron plates, and a positioning ring is inserted into the rotating shaft to position the rotor relative to a bearing that supports the rotating shaft. The proximal end protruding from the rotor of the rotor is the final polished part, the tip side of the final polished part inserted and supported by the bearing is the polished part, the inner diameter of the positioning ring is larger than the outer diameter of the polished part, and the final polished part is An electric motor formed with a diameter smaller than the outer diameter of the motor.