JPH0357099Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electric motor having a rotating shaft passing through a bearing housing of a motor frame.

[Conventional technology]

For example, as shown in FIG. 5, an electric motor used in an upright vacuum cleaner has a rotating shaft 1 that passes through a bearing housing 3 formed in a motor frame 2 and projects to the outside. Note that a pulley (not shown) attached to one end of the protruding rotating shaft 1 transmits rotational power to the floor brush section via a belt wrapped around the pulley. As shown in FIG. 6, a rolling bearing 4 is housed inside the bearing housing 3, and an outer ring 4a of the bearing 4 is pressed against a bearing seat 3a of the housing 3. The rotating shaft 1 included in the rotor is supported by a bearing 4, and projects out of the motor frame 2 through a hole 3b provided in the bottom wall of the housing 3. Furthermore, bearing housing 3
A flat washer 5 is housed in contact with the bottom wall side end surface of the outer ring 4a of the rolling bearing 4, and a wave spring washer is sandwiched between the flat washer 5 and the bottom wall of the housing 3. thrust spring 6
is housed, and the spring force of this thrust spring 6 applies preload to the rolling bearing 4. In FIGS. 5 and 6, 7 is a fan attached to the other end of the rotating shaft 1, 8 is a brush device, and 9 is a dustproof ring.

[Problem that the invention attempts to solve]

However, in such a conventional example, when an attempt is made to bond the outer ring 4a of the rolling bearing 4 and the bearing seat 3a by pouring adhesive through the hole 3b of the bearing housing 3 after assembly, most of the adhesive is poured into the bearing 4. There is a danger that it may get inside. Furthermore, if adhesive is applied to the outer ring 4a of the rolling bearing 4 in advance and the bearing 4 is housed in the bearing housing 3, the rolling bearing 4 will be glued in an incorrect position and an appropriate thrust pressure will be applied to the rolling bearing 4. It may not be possible. Because of these circumstances, the outer ring 4a of the rolling bearing 4 and the bearing seat 3a of the bearing housing 3 are not fixed with adhesive but are simply pressed together as described above.
There is a risk that the bearing 4 may slip on these fitting surfaces, a so-called creep phenomenon, which may cause seizing of the bearing 4 or abnormal vibration.

[Means for solving problems]

The present invention supports a rotor on a motor frame via a rolling bearing, and also allows the rotating shaft of the rotor to pass through a hole provided in the bottom wall of a bearing housing formed in the frame, and The method is implemented in an electric motor in which a ring-shaped thrust spring is provided between a rolling bearing installed inside the bearing housing and the bottom wall, and the rolling bearing installed inside the bearing housing and the bearing seat of the bearing housing are fixed with an adhesive. At the same time, a bearing cap is interposed between the thrust spring and the rolling bearing, and the cap is provided with a cylindrical portion that forms an adhesive pouring gap between the cap and the hole and through which the rotating shaft passes. This solves the above-mentioned conventional problems.

[Effect]

The electric motor equipped with the above solution is assembled so that the rotating shaft of the rotor passes through and is supported by the bearing housing that houses the thrust spring, the bearing cap, and the rolling bearing. A predetermined preload can be applied to the bearing. In this state, by pouring adhesive from the adhesive pouring gap formed between the hole in the bottom wall of the bearing housing and the cylindrical portion of the bearing cap, the adhesive is poured into the inside of the rolling bearing by the bearing cap. The adhesive can be guided between the bearing and the bearing seat of the bearing housing with which it is in contact, and the bearing and the bearing seat can be fixed with the adhesive while preventing the intrusion of the adhesive.

〔Example〕

Reference numeral 11 in FIGS. 1 and 2 showing an embodiment of the present invention is a motor frame, and a bearing housing 12 projecting outward is integrally formed at the center of the bottom of the motor frame. A rolling bearing 13 is housed inside the bearing housing 12, and an outer ring 13a of the bearing 13 is fixed to a bearing seat 12a formed of a cylindrical portion of the housing 12 with an adhesive as described below. A rotating shaft 14 of a rotor is rotatably supported on the motor frame 11 via the bearing 13 and other bearings (not shown), and both ends of the rotating shaft 14 pass through each of the bearings. .

One end of the rotating shaft 14 that passes through the bearing 13 also passes through a hole 15 provided in the bottom wall 12b of the housing 12 and projects outside the motor frame 11, and the tip thereof is not shown. A pulley is attached to transmit rotational force to the floor brush section. Note that the inner ring 13b of the bearing 13 is fixed to the rotating shaft 14 with adhesive, and
A fan is attached to the other end of the rotating shaft 14 passing through another bearing (not shown).

Inside the bearing housing 12 is a bottom wall 12 thereof.
A bearing cap 16 is sandwiched between b and the bearing 13.
A ring-shaped thrust spring 17 is housed therein. In other words, the bearing cap 16 is formed by integrally providing a cylindrical portion 16a in the center of a metal disc through which the rotating shaft 14 passes, which covers the end surface of the bearing 13 on the bottom wall 12a side and covers the peripheral portion. Only the outer ring 13a of the bearing 13 is provided in contact with the end surface of the outer ring 13a. The tip of the cylindrical portion 16a is connected to the hole 1.
5, and forms an adhesive pouring gap G between the hole 15 and the hole 15. Further, the thrust spring 17 is made of a wave spring washer or the like. This spring 17 is connected to the bottom wall 12
b and the circumferential portion of the bearing housing 12, and its spring force presses the circumferential portion of the bearing cap 16 against the outer ring 13a to apply preload to the rolling bearing 13.

In FIG. 1, 18 is a commutator attached to the rotor, 19 is a brush device attached to the motor frame 11, and 20 is in contact only with the inner ring 13b of the bearing 13 and is rotated together with the rotating shaft 14. It is a dustproof disc.

In assembling the electric motor having the above configuration, the thrust spring 17 and the bearing cap 16 are housed in the bottom of the bearing housing 12 in the stated order, and then the rolling bearing 13 fixed to the rotating shaft 14 of the rotor is inserted into the bearing housing 12. The rotor is press-fitted into the housing 12, thereby supporting the rotor with respect to the motor frame 11. In this supported state, the bearing seat 12a of the bearing housing 12 is merely in pressure contact with the outer ring 13a of the rolling bearing 13, and is not fixed with adhesive. 13 is properly preloaded. After this, the bearing seat 12a of the bearing housing 12 and the outer ring 1 of the rolling bearing 13 are
3a are fixed by pouring adhesive from the adhesive pouring interval G.

In other words, the poured adhesive is prevented from entering the inside of the rolling bearing 13 by the bearing cap 16, flows down along the surface of the cap 16, and is guided between the bearing seat 12a and the outer ring 13a. As a result, the outer ring 13 of the bearing 13
a is adhesively fixed to the bearing seat 12a. Therefore, it is possible to prevent the rolling bearing 13 from seizing during use, from causing abnormal vibrations, and other creep phenomena.

Further, in another embodiment of the present invention shown in FIGS. 3 and 4, the cylindrical portion 16a of the bearing cap 16 is formed in a tapered shape, and the cylindrical portion 16a is formed in a tapered shape.
The structure is similar to that of the above embodiment except that the hole 15 is passed through the hole 15.

Therefore, it goes without saying that the intended purpose of the present invention can be achieved by providing the bearing housing 16 in this embodiment as well. In addition to this, since the cylindrical portion 16a passes through the hole 15 and the cylindrical portion 16a is tapered,
This not only makes it possible to more reliably prevent the adhesive from entering the inside of the rolling bearing 13, but also facilitates the pouring and guiding of the adhesive, thereby improving work efficiency.

Although each of the above-mentioned embodiments is constructed as described above, in implementing the present invention, the motor frame, the bearing housing, its bearing seat and bottom wall, hole, rotating shaft, etc. The specific structure, shape, position, etc. of the rolling bearing, the bearing cap and its cylindrical portion, the thrust spring, the adhesive pouring space, etc. are not limited to the above embodiments, and may be implemented in various ways. Of course it can be done.

[Effect of idea]

According to the present invention, the gist of which is the configuration described in the scope of the above-mentioned utility model registration claims, an adhesive pouring hole is formed between the hole of the bearing housing through which the rotating shaft passes, and a cylinder through which the rotating shaft passes. By providing a bearing cap with a portion, it is possible to prevent adhesive from entering the bearing and operate the bearing while the thrust spring applies an appropriate preload to the rolling bearing housed in the housing. It has the practical effect of being able to be fixed to the bearing seat of the bearing housing via an adhesive and preventing the creep phenomenon that causes seizure and abnormal vibration of the rolling bearing.

[Brief explanation of drawings]

1 and 2 show a motor for an upright vacuum cleaner according to an embodiment of the present invention,
FIG. 1 is a sectional view of the main parts, and FIG. 2 is a perspective view of the bearing cap. 3 and 4 show other embodiments of the present invention, with FIG. 3 being a sectional view of the main parts, and FIG. 4 being a perspective view of the bearing cap. 5 and 6 show a conventional example, with FIG. 5 being a side view of a motor for an upright type vacuum cleaner, and FIG. 6 being a partial sectional view. DESCRIPTION OF SYMBOLS 11... Motor frame, 12... Bearing housing, 12a... Bearing seat, 12b... Bottom wall, 13
... Rolling bearing, 14 ... Rotating shaft, 15 ...
Hole, 16...Bearing cap, 16a...Cylinder part, 1
7...Thrust spring, G...Between adhesive pouring.

Claims (1)

[Claims for Utility Model Registration] (1) A rotor is supported by a motor frame via a rolling bearing, and the rotation axis of the rotor is passed through a hole provided in the bottom wall of a bearing housing formed in the frame. and a ring-shaped thrust spring is provided between the rolling bearing housed in the bearing housing and the bottom wall, wherein the rolling bearing housed in the bearing housing and the bearing seat of the bearing housing are connected to each other. In addition to fixing with adhesive, a bearing cap is interposed between the thrust spring and the rolling bearing, and an adhesive pouring gap is formed between the cap and the hole, and the rotating shaft passes through the cap. An electric motor characterized by having a cylindrical portion. (2) The electric motor as set forth in claim 1 of the above utility model registration, characterized in that the cylindrical portion of the bearing cap has a tapered shape.