JPH0135558Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a bearing support device for a rotating electrical machine, particularly a small brushless rotating electrical machine.

[Conventional technology and problems]

FIG. 7 shows a side cross section showing an example of the structure of a motor equipped with a conventional device of this type.

The rotary shaft 5 is rotatably supported by two bearings 7 and 8 mounted on the same axis of the rotary shaft 5 at both ends of the rotor 4 .

The rotating shaft 5 and the inner ring of these bearings 7 and 8 are fixed by shrink fitting, press fitting, adhesion, or the like.

The outer ring of the load-side bearing 7 is axially tightened and fixed by the bearing cover 6, but may also be fixed by adhesive or other means. On the other hand, the outer ring of the bearing 8 on the opposite load side is loosely fitted with the bearing housing 2a and has a small gap, so that the shaft is moved by the spring pressure of the wave spring 9 incorporated in order to suppress the gap inside the bearing 8. It is common to allow the outer ring to slide in this direction.

The wave spring 9 can be replaced with a coil spring or other claw spring.

In any case, in a motor that uses bearings, either the inner or outer ring of the two bearings must be able to slide in the axial direction, and the bearing gap can be suppressed by the pressure of a spring or the like. I have to.

If the gap between the bearings is not suppressed, so-called bearing failures will occur, such as abnormal bearing rotation noise and vibration, and reductions in bearing rigidity and life.

In addition, 1 is a bracket, 2 is a frame, 3 is a stator formed of laminated steel plates around which a winding that generates a rotating magnetic field is wound, and 4 is a permanent, axially long permanent member on the outer circumferential surface facing the stator 3 with a gap in between. The rotor is made of a magnetic material to which magnets are fixed, and is fitted and fixed to the rotating shaft 5.

The necessary function of a motor is to attach a rotating load to the load shaft and rotate it, but in some cases, something is attached to the load shaft that has a negative effect on the bearings in the motor, causing problems around the bearings at an early stage. There are many things that happen.

In recent years, in information terminal processing equipment for OA equipment,
Disks made of metal, plastic, glass, etc., which serve as information media, tend to be rotated at high speed by motors, resulting in a decrease in mechanical installation accuracy such as misalignment or surface runout when the disk is attached to the load shaft. There are cases where the rotating body becomes significantly unbalanced.

Unbalance due to this rotation causes a creep phenomenon in which relative movement occurs between the bearing outer ring and the bearing housing at the bearing outer ring fitting part, and often leads to functional failure due to progressive wear and heat generation due to relative sliding.

The creep phenomenon progresses quickly when the fitting gap is large, and even when the gap is small, wear progresses gradually, leading to the gap becoming larger.

In addition, if the gap is large, or even if the gap is small but the rotational unbalance is large, apart from the creep phenomenon mentioned earlier, radial movement will occur between the housing and the outer ring of the bearing, and this movement will occur between the metal It taps and makes an abnormal sound.

In the conventional structure shown in Fig. 7, the axial tightening force of the bearing cover suppresses this creep phenomenon and slapping on the load side, so there is no problem, but on the anti-load side, there is no deterrent force against this creep and slapping. Large imbalances have the disadvantage of causing creep phenomena and searing abnormalities, resulting in functional failure.

[Purpose of invention]

Here, the present invention overcomes the difficulties of conventional equipment, prevents the creep phenomenon that occurs between the bearing housing and the bearing outer ring even when rotational imbalance is applied to the load shaft, and solves the abnormal rattling noise of rotating electrical machinery. The object of the present invention is to provide a bearing support device.

[Summary of the idea]

The present invention is a bearing support device in which each bearing is fixed to both ends of a rotating shaft to which a rotor is fitted and fixed, and the rotating shaft is rotatably supported. A bearing support housing that fits and supports the outer peripheral surface of the collar is provided on the axial end surface of the frame forming the outer frame or on the axial end surface of the anti-load side bracket, and between the axial end surface and the side surface of the collar. A gap is provided, and a thin leaf spring is provided in the gap, one end of which is fixed evenly to the side surface of the collar, and the other end of which is fixed evenly to the end surface of the bearing support housing facing the gap. This is a bearing support device for rotating electric machinery that has high rigidity in the radial and rotational directions by applying preload to the bearing.

〔Example〕

A cross-sectional side view of the main parts of an embodiment of the present invention is shown in FIG. 1a.

FIG. 1b is a front sectional view taken along the line AA.

Further, a partially detailed enlarged view of FIG. 1a is shown in FIG.

These all show the area around the bearing support on the anti-load side.

In the present invention, if the thin plate spring 13 is formed and attached as shown in FIG. 1, pressure is applied in the axial direction.
We also focused on the fact that it has high rigidity in the direction of rotation, which prevents it from rotating.

Here, as shown in FIG. 6 (a is a plan view, b is a side sectional view), the thin leaf spring 13 has two opposing locations in the cross direction, one (hole 17) toward the bearing side and the other (hole 17) toward the bearing side. The holes 18) are respectively screwed to the housing side. 14 is a hippopotamus.

Also, attach the thin leaf spring 13 to the spacer 1 with the screw 12.
1, the plate spring 13 is bent by δ, and the setting is made such that sufficient pressure is applied to the bearing 8 so that the gap inside the bearing 8 is suppressed.

However, since it is difficult to provide a screw hole in the outer ring of the bearing 8, a collar 10 is inserted in the middle and a screw hole 16 is provided in it for fastening purposes. Color is Figure 4a
It is shown in side cross section in plan view b.

Therefore, the collar 10 is fixed at the fitting part with the outer ring of the bearing 8 by shrink fitting, press fitting, or adhesive with a fixing force that resists creep force, and the necessary wall thickness is maintained as shown in FIG. A gap is created in the housing fitting with the outer ring concentrically with t, and the outer diameter dimension is determined in a state in which the housing can be slid in the axial direction.

However, in the conventional structure, the dimensional difference between φD' (inner diameter of the bearing support housing 2a) and φD (outer diameter of the outer ring of the bearing 8) in FIG. Since the collar 10 is fixed in the radial and circumferential direction with a thin leaf spring 13, φD' and φD (necklace outer diameter)
The dimensional difference can be increased to about several hundred microns.

In other words, the shaft side is held hollow by the thin leaf spring 13.

When the motor rotates under no load and nothing is attached to the motor load shaft, it is sufficient to support the weight of the rotating side. However, when a large unbalanced rotational load is attached, the effect of the thin leaf spring 13 is is demonstrated.

The thin leaf spring 13 can have low rigidity in the thickness direction, and can easily be made to have high rigidity in the direction perpendicular to the thickness, that is, in this case, the radial direction and rotational direction.

Therefore, by supporting this hollow space (the gap from the end faces of the rotating shaft 5 and bearing 8 to the inner end of the cover 14) with a thin leaf spring 13, it is possible to not only prevent creep but also to prevent the metal between the housing 2a and the shaft side. It is also possible to prevent abnormal tapping noises caused by contact.

The following means can be considered as other embodiments of the present invention.

Collar 10 is generally made of metal, but may also be made of reinforced plastic or the like.

The thin leaf spring 13 is preferably a metal plate, and is mainly selected from materials for spring use, but is not limited thereto.

Further, the shape of the thin leaf spring 13 can be freely taken, and FIG. 6 is only one example, and it is sufficient as long as it can be pressurized in the desired axial direction and has high rigidity in the rotational direction and radial direction. It is. Note that the number of screw fastening holes 17 and 18 may also be four or more for the above-mentioned reason.

Further, in order to apply sufficient pressure in the axial direction of the thin leaf spring 13, the leaf spring 13 is fixed only at the screw fastened part under the thin leaf spring 13, and the thin leaf spring 13 is fixed to the housing 2a and the collar in other parts. Although a spacer 11 is inserted to prevent contact with collar 10,
Alternatively, a protrusion having the same function as the spacer 11 may be integrally provided from the housing 2a.

[Effect of idea]

Thus, according to the present invention, a rotating body with an unbalanced load can be attached to the load shaft by incorporating a thin leaf spring at the end of the shaft on the opposite load side and adopting a structure in which the rotating shaft is supported only by the thin leaf spring. It is also possible to prevent creep and eliminate abnormal noise caused by tapping with the housing's one shaft side, making it possible to obtain a highly reliable and high quality motor even for applications with unbalanced rotational loads.

[Brief explanation of the drawing]

FIG. 1a is a side view showing a main part in cross section in an embodiment of the present invention, b is a front sectional view taken along line A-A, FIG. 2 is a partially enlarged view of FIG. 1a, Third
The figure is a side sectional view showing how the collar is attached to the bearing, Figures 4a and b are a plan view and side sectional view of the collar, Figures 5a and b are a plan view and side sectional view of the spacer, and Figure 6 is a side sectional view showing how the collar is attached to the bearing. a and b are a plan view and a side sectional view of the leaf spring, and FIG. 7 is a side sectional view of a conventional example. 1...Bracket, 2...Frame, 3...Stator, 4...Rotor, 5...Rotating shaft, 6...Bearing cover, 7...Load side bearing, 8...Counter load side bearing, 9... Wave spring for adding preload, 10... empty,
11... Spacer, 12... Leaf spring fastening screw, 1
3...Plate spring, 14...Cover, 15...Joint part between the outer circumferential surface of the counter-load side bearing and the inner circumferential surface of the collar, 16...Screw hole for fastening the plate spring, 17...Collar, for fastening screws between the plate springs Hole, 18... Hole for fastening screws between the frame and the plate spring.

Claims (1)

[Scope of Claim for Utility Model Registration] In a bearing support device in which bearings 7 and 8 are fixed to both ends of a rotating shaft 5 to which a rotor 4 is fitted and fixed, and rotatably supports the rotating shaft 5, A ring-shaped collar 10 fixed to the outer circumferential surface of the outer ring is provided, and a bearing support housing 2a that fits and supports the outer circumferential surface of the collar 10 is provided on the anti-load side axial end surface, and the axial end surface and the side surface of the collar 10 are provided. A thin leaf spring 13 is provided in this space, one end of which is fixed equally to the side surface of the collar 10, and the other end of which is fixed equally to the end face of the bearing support housing 2a facing the space. A bearing support device for a rotating electric machine, comprising: a radial space between the collar 10 and the bearing support housing 2a.