JPH0242062Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a bearing holding structure for various motors.

[Conventional technology and its problems]

Conventionally, when attaching a rotating shaft to the housing of various motors via a bearing, the bearings were first press-fitted into predetermined positions of the housing one after another, and then the rotating shaft was inserted into the bearing. Therefore, each component must be assembled separately, resulting in the problem that assembly cannot be carried out quickly.

The present invention solves the above-mentioned problems and provides a bearing holding structure which has the advantage that there is no need to specially process and form a stepped part on the rotating shaft to regulate the position of the bearing. It is an object.

[Means for solving problems]

The present invention includes a bearing that is fitted and held in a cylindrical portion of a housing, a rotating shaft that is rotatably supported by the housing via the bearing, and a rotor that is fixed to one end of the rotating shaft. In a bearing structure used in a motor, a bearing movement regulating stepped portion is formed on the inner circumferential surface of the cylindrical portion, and a position regulating step is formed on the rotating shaft to abut the inner ring of the bearing furthest from the rotor. A retaining member is provided, and a protrusion for pressing the outer ring of the bearing closest to the rotor is formed on the inner surface of the boss portion of the rotor fixed to the rotating shaft, and a protrusion for pressing the outer ring of the bearing closest to the rotor. A spring biasing member for mutual repulsion is interposed between the inner surface of the boss portion of the rotor, and the outer rings of the bearing closest to the rotor and the bearing furthest from the rotor are connected to the bearing movement regulating stage. It was brought into contact with the part.

[Operation] The outer ring of the bearing is pressed into the housing by the protrusion formed on the boss of the rotor. When the bearing is fitted into a predetermined position in the housing, by removing the above-mentioned pressing force, the restoring force of the elastic member acts, and the rotor is pushed back a predetermined distance in the opposite direction along with the rotating shaft, and the protruding portion 12 and the outer ring of the bearing 3 are in a non-contact state.

〔Example〕

Embodiments of the present invention will be explained in detail based on the drawings.

FIG. 1 shows a brushless motor according to the present invention, which includes a housing 2 having a cylindrical portion 1, bearings 3, 4, etc. fitted and held in the cylindrical portion 1, and the bearings 3, 4. It has a rotating shaft 5 that is rotatably supported by the housing 2 via... and a rotor 7 that is fixed to one end 6 of the rotating shaft 5. Further, a stator 9 around which a coil 8 is wound is fixed to the cylindrical portion 1 of the housing 2, and the rotor 7 is provided with a multipolar magnetized rotor magnet 10.

Therefore, a protrusion 37 is formed in the axial middle of the inner circumferential surface 19 of the cylindrical portion 1, so that the bearing movement regulating step 3
5 and 36 are formed. The rotating shaft 5 includes:
Inner ring 2 of the bearing 4 furthest from the rotor 7
1, and furthermore, the inner surface 11 of the boss portion 23 of the rotor 7 fixed to the rotating shaft 5 is provided with a position regulating stopper portion 17 that contacts the rotor 7 and presses the outer ring 13 of the bearing 3 closest to the rotor 7. A protrusion 12 is formed for this purpose. In the illustrated example, the protrusion 12
is annular with approximately the same outer diameter as the outer ring 13.
The inner ring 20 of the bearing 3 and the boss portion 2 of the rotor 7
A resilient biasing member 14 such as a disc spring is interposed between the inner surface 11 of 3 and the inner surface 11 of 3, for repelling both of them.
The biasing member 14 is provided so as to be movable in the axial direction of the rotating shaft 5 while the rotating shaft 5 is inserted through the hole 15 until an adhesive 24 described later is solidified. In the illustrated example, the biasing member 14 is comprised of two trapezoidal halves 16, 16 with symmetrical side surfaces, and can be elastically deformed into a flat shape by being pressed from both directions. It is also preferable to use a plate spring, a coil spring, or the like as the biasing member 14.

Reference numeral 17 denotes a position regulating and retaining member for positioning the rotating shaft 5, which has a substantially C-shape, etc., with both ends expanded in the radial direction, and a circumferential groove attached to a predetermined portion of the rotating shaft 5. 18. The retaining member 17
Alternatively, a pin or the like may be used to insert it into a through hole attached to the rotating shaft 5. Alternatively, a member itself such as a hub or a pulley fixed to the rotating shaft 5 may be used as the retaining member 17 (not shown).

The housing 2 is fixed to another member (not shown) via a housing flange 31 projecting from the outer peripheral surface of the cylindrical portion 1 in the form of an outer flange. Further, a magnetic disk mounting plate 25 is fixed to the other end of the rotating shaft 5. Then, the rotational position of the rotor magnet 10 is detected by a rotor position detector consisting of a Hall element, Hall IC, etc. (not shown), and the rotational position of the stator 9 is sent to the coil 8 based on the rotational position detection signal from the detector. The energization is switched and controlled, and this brushless motor rotates.

Of the bearings 3 and 4, the bearing 3 located closest to the rotor 7 has its outer ring 13 fixed to the inner circumferential surface 19 of the cylindrical portion 1 by adhesive or press fitting, and its inner ring 20 and rotating shaft 5 A slight gap is provided between the inner ring 20 and the rotating shaft 5, and the inner ring 20 and the rotating shaft 5 are loosely fitted into each other. In addition, the inner ring 21 of the other bearing 4 is fixed to the rotating shaft 5 by gluing or press-fitting, or is free, and the outer ring 22 is fixed to the inner peripheral surface 19 of the cylindrical portion 1 by gluing or press-fitting. , or leave it free.

Next, the assembly method will be described. As shown in FIG. 3I, the rotating shaft 5 is fitted into the bearing 4, and the elastic biasing member 14 is interposed between the rotor 7 and the bearing 4. Fit the rotating shaft 5 into the bearing 4 by moving it in the direction of the arrow. Note that the rotor 7 is fixed to one end 6 of the rotating shaft 5 in advance.

Using a press etc., as shown in Figure 3,
By pressing the rotor 7 in the direction of the arrow, the outer ring 13 of the bearing 4 is pressed through the protrusion 12 and fitted into the inner peripheral surface 19, and at the same time, the inner ring 2
0 is pressed in the same direction via the elastic biasing member 14. In the figure, since the axial dimension of the biasing member 14 in the used state is set larger than the protrusion height of the protrusion 12, it is elastically deformed by the pressing force of the press, and the retaining member 17 is inserted into the circumferential groove 18. Can be installed. After this, if the pressing force of the press is removed, the elastic biasing member 1
Due to the restoring force of 4, the rotating shaft 5 is moved by the rotor 7 until the position regulating member 17 comes into contact with the bearing 4.
At the same time, it moves slightly in the direction of the arrow to reach the normal assembly position. Note that in the example shown in FIG.
is applied to the inner ring 21 or the outer ring 13, respectively, after a certain period of time has elapsed, and the case is shown in which the inner ring 21 or the outer ring 13 is solidified and fixed thereto, but it may also be fixed without using an adhesive. Note that the bearing 4 may be loosely fitted.

FIG. 4 shows a case where the present invention is applied to a brushless motor having a rotor 7 with an impeller 29, and the rotor 7 has a boss portion 23 formed as a separate member.

FIG. 5 shows a comparative example, in which it is applied to an inner rotor type motor with a pulley 34.
A protrusion 12 is provided on the pulley 34 to press the outer ring 13 of the bearing 3 near the pulley 34. In addition to these, the present invention can be similarly applied to a motor with a gear, a motor with a fan, or the like.

Although not shown, the rotor 7 is integrally formed so that it also serves as the magnetic disk mounting plate 25, that is, both are provided on the same side of the rotating shaft 5, for example, on the one end 6 side in the embodiment shown in FIG. It is also preferable to do so.

[Effect of idea]

As described above, in the present invention, the protruding part 12 for pressing the outer ring 13 of the bearing 3 closest to the rotor 7 is formed on the inner surface 11 of the boss part 23 of the rotor 7 fixed to the rotating shaft 5, and By interposing the spring biasing member 14 between the inner ring 20 of the bearing 3 and the inner surface 11 of the boss portion 23 of the rotor 7, the outer ring 13 of the bearing 3 closest to the rotor 7 The fitting of the housing 2 into the housing 2 can be carried out after the rotating shaft 5, rotor 7, and bearing 3 are assembled together. Assembly is therefore easy and quick.

By holding the bearings 3 and 4, which pivotally support the rotary shaft 5, between the position regulating member 17 and the spring biasing member 14, there is no need to form a stepped portion on the rotary shaft 5, and the protrusion can be prevented. The bearings 3, 4, . . . , the rotating shaft 5, and the housing 2 can be fitted into each other using a straight shaft without any parts.

By providing the resilient biasing member 14 so that the bearing 3 and rotor 7 repel each other,
This has the effect of preventing vibration of the bearings 3 and 4 and reducing noise when the rotating shaft 5 rotates.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing one embodiment of the present invention;
The figure is an enlarged sectional view of the elastic biasing member, FIG. 3 is an explanatory view showing the procedure for assembling the bearing and the rotating shaft into the housing, and FIG. 4 is a sectional view showing another embodiment. FIG. 5 is a sectional view showing a comparative example. 1... Cylindrical part, 2... Housing, 3, 4...
Bearing, 5... Rotating shaft, 6... One end, 7...
Rotor, 11...Inner surface, 12...Protrusion, 13...
... Outer ring, 14 ... Spring biasing member, 17 ... Position regulating member, 19 ... Inner peripheral surface, 20 ... Inner ring, 2
2...Outer ring, 23...Boss portion, 35, 36...Bearing movement restriction stepped portion, 37...Protrusion portion.

Claims (1)

[Claims for Utility Model Registration] Bearings 3, 4, etc., which are fitted and held in the cylindrical portion 1 of the housing 2, and a rotating shaft rotatably supported by the housing 2 via the bearings 3, 4,... 5, and a rotor 7 fixed to one end 6 of the rotating shaft 5. In the bearing structure used for a motor, the inner peripheral surface 19 of the cylindrical portion 1 is provided with bearing movement regulating step portions 35, 36. is formed, and on the rotating shaft 5,
A position regulating member 17 that comes into contact with the inner ring 21 of the bearing 4 that is farthest from the rotor 7 is provided on the inner surface 11 of the boss portion 23 of the rotor 7 that is fixed to the rotating shaft 5. A protruding portion 12 is formed to press the outer ring 13 of the bearing 3 which is close to the inner ring 20 of the bearing 3 and the inner surface 1 of the boss portion 23 of the rotor 7.
an elastic biasing member 1 for mutual repulsion between the
Further, the outer rings 13 and 22 of the bearing 3 closest to the rotor and the outer ring 22 of the bearing 4 furthest from the rotor are connected to the bearing movement regulating step portions 35 and 36, respectively.
A bearing holding structure characterized by being brought into contact with a bearing holding structure.