JPS5849730B2 - bearing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bearing device, and more particularly to a bearing device that can prevent so-called "play" without providing a mounting space in the axial direction.

Generally, a ball bearing is as shown in the sectional view of FIG.

The ball bearing 1 has a large number of balls 13 between an inner ring 11 and an outer ring 12.

Further, the balls 13 are interposed between arcuate grooves 14A and 14B provided in the inner ring 11 and the outer ring 12, and are held by a holder 15 so as to be positioned evenly around the circumference.

However, the ball 13 has an arc-shaped groove 14A, 1 due to the manufacturing process.
Since it is slightly smaller than 4B, "play" occurs in the axial direction in the grooves 14A and 14B.

For this reason, if only one ball bearing is used, for example, if a knife is applied to the inner ring 11 in the direction of the arrow 16, the center axis 17 of the inner ring will not coincide with the center axis 18 of the outer ring 12, and the center axis will run out in accuracy. This caused him to fall into the trap.

For this purpose, as shown in the conventional bearing device 2 of FIG. 2, the ball bearings IA and IB are locked to a step 191 provided at the intermediate portion of the shaft 19.

Next, the shaft 19 and ball bearings IA, IB are inserted into the outer periphery 20.

The ball bearing IA is fixed by a protrusion 201 inside the outer cylinder 20, and the ball bearing IB is fixed by a screw 21 fastened to the inner wall of the outer cylinder 2o.

The pressure in the bearing device 2 was applied as follows.

By tightening the screw 21, the inner ring 11 of the ball bearing IA and the outer ring 12 of the ball bearing IB move in the axial direction.

Therefore, the ball 13 is tightened by the arcuate groove 14B of the outer ring 12 and the arcuate groove 14A of the inner ring 11.

As a result, the balls 13 eliminate so-called "play" and the four central axes of the inner ring 11 coincide with the central axis of the outer ring, eliminating eccentricity.

However, since this bearing device 2 has two ball bearings IA and 1B arranged in the direction of the axis 19, the bearing device 2 as a whole is long in the axial direction.

In particular, when rotating a lens system in an optical device where it is difficult for the ball bearings IA and IB that apply pressure to have sufficient space in a certain direction in the entire device system, it is possible to use two lenses with short focal lengths. Therefore, relatively large-diameter bearings are used.However, arranging two identical bearings side by side in the axial direction as shown in FIG. 2 would require a longer path for light, making it essentially impossible to use this method.

The present invention aims to solve these drawbacks, and provides a bearing device that is capable of applying pressure within the limited axial space and improving the rotation accuracy of the bearing.

Next, one embodiment of the present invention will be described in detail with reference to FIGS. 3 and 4.

FIG. 3 shows the rtt of the bearing device of the present invention shown in FIG.
-m line sectional view is shown, and FIG. 4 is a bottom view of the bearing device of the present invention.

In these figures, 3 indicates a bearing device.

In the bearing device 3, 31 is a flange shaft.

The flange shaft 31 includes a cylindrical portion 311 and a pressurized pressure transmitting portion 312 that extends thinly in the outer circumferential direction from one end of the upper portion of the cylindrical portion.
and an end portion 313 provided on the pressurization transmission portion 312 with an annular projection.

There is a step 3 on the outer periphery of the cylindrical portion 311 of the flange shaft 31.
14 is shaped.

The flange shaft 31 and the inner ring 11 are connected to each other through the cylindrical portion 3.
The inner ring 11 is press-fitted onto the outer periphery of the
This is done by tightening the screw 32 to the cylindrical portion 11.

Further, the pressurization transmission section 312 is made of a steel plate, but is not limited to this as long as it is made of an elastic material such as spring steel.

Further, the end portion 313 of the pressurized pressure transmitting portion 312 may not protrude downward, and the back surface of the pressurized pressure transmitting portion 312 may be flat.

33 is a cylindrical frame.

The frame 33 has a step 332 at the top of an inner wall 331 thereof.

Further, the frame 33 and the outer ring 12 are connected to each other by the frame 33.
Fit the outer ring 12 into the inner wall 331 of the outer ring 1 at the step 332.
This is done by stopping 2.

The outer ring 12 and the frame 33 are held by a lid 34.

To attach the lid 34, as shown in the bottom view of FIG.
5 and tightened to the frame 33.

36 is a pressurized ball bearing.

The pressurized ball bearing is arranged such that its outer ring 361 contacts the end portion 313 and the frame 33 is positioned in the direction of the central axis of the inner ring 362.

A washer 37 is interposed between the frame 33 and the pressurizing ball bearing 36.

Reference numeral 38 is an eccentric pusher whose inner diameter l1 and outer diameter l2 have an eccentric dimension X as shown in the perspective view of FIG.

39 is a bolt that connects the inner ring 36 of the pressurized ball bearing 36.
The eccentric pusher 38 is screwed onto the frame 33 through the washer 31 and the hole 381 of the eccentric pusher 38 which is inserted into the shaft hole of No. 2.

Contact between the pressurizing ball bearing 36 and the flange shaft 31 is performed as follows.

Before each of the three bolts 39 are completely tightened, each of the eccentric pushers 38 is rotated to adjust the eccentricity dimension X.
Adjustment is made so that the outer ring 361 of the ball bearing 36 contacts the end portion 313 evenly and the pressure is constant.

Next, each bolt 39 is fully tightened.

Such adjustments are made for each of the ball bearings, eccentric pushers, and bolts provided at three locations as described above.

Similarly, as the pressurizing ball bearing 36, a thrust ball bearing 4o disposed annularly around the outer periphery of the frame 33 as shown in FIG. 6 may be used.

This thrust ball bearing 40 is fixed as follows.

The upper ring 401 of the thrust ball bearing 4o is attached to the end 31
3, and on the other hand, the lower ring 402 is brought into contact with the nut 41.

Further, since the nut 41 is screwed onto the frame 33, the pressurizing ball bearing 40 is pressed against the end portion 313 when the nut 41 is tightened.

Therefore, if the nut 41 is further tightened, the upper wheel 401
is lifted and the end portions 313 rise all together and pressure is applied.

, 42 is a nut, which has a double nut structure together with the nut 41, and by tightening this, the "looseness" between the nuts can be taken up and the connection can be made stronger.

Although not shown as another bearing device, pressure is applied between the outer ring 12, the balls 13, and the inner ring 11 by interposing pressurizing balls directly between the pressurizing transmission section 312 and the frame 33. You can also do that.

In this case, a retainer may be used to maintain the interval between the pressurizing balls.

Further, when a direct pressurizing ball is used between the outer ring 12 and the outer ring 12, it is desirable that the frame 33 is made of the same material as the outer ring 12.

Next, the operation when the present invention is used will be explained using FIG. 3.

The contact pressure between the pole bearing 36 and the end portion 313 is uniformly adjusted by adjusting the amount of eccentricity caused by the rotation of the eccentric pusher 38.

Therefore, the force that pushes up the end portion 313 acts evenly, and this force causes the pressurization transmission portion 312, the cylindrical portion 311 and the inner ring 1
1 is strongly pushed up in the direction of arrow 43.

Since the inner ring 11 is lifted in the axial direction, pressure is applied to the inner ring 11, causing a play between the inner ring 11, the balls 13, and the outer ring 12.
is completely removed.

Thereafter, by tightening the bolts 39, the eccentric pusher 38 and the inner ring of the pressurizing ball bearing are firmly fixed to the frame.

Similarly, in this example, the pressurized ball bearing is 120°
They are placed at intervals.

Further, when the pressurized pressure transmitting portion 312 is formed of an elastic material, the amount of deflection of each portion can be made constant by a measuring method such as a dial gauge.

As described above, by using the present invention, pressure can be easily applied in the axial direction of the bearing device by the pressurizing ball bearing and the flange shaft that contacts the pressurizing ball bearing.

Therefore, the so-called "6" play between the inner ring, ball, and outer ring is completely eliminated.

For this reason, even if force is applied to a part of the inner ring of the bearing device, the pressure in the opposite direction is applied from the end of the pressurized pressure transmission part, so the center axis will not shift and eccentricity will not occur, so the rotational fatigue of the inner ring will be reduced. It is greatly elevated.

Moreover, play 6'' can be prevented without providing an excessive mounting space in the axial direction.

Therefore, pressurization can be applied extremely effectively even in the bearing space of an optical system device or the like in which it is impossible to arrange two identical bearings in the axial direction.

[Brief explanation of drawings]

Figure 1 is a sectional view of a general ball bearing, Figure 2 is a sectional view of a conventional ball bearing with eccentricity control, and Figure 3 is a sectional view of a conventional ball bearing with eccentricity control.
The figures are Fig. 4 of the bearing device of the present invention.
4 is a bottom view of the bearing device of the present invention, FIG. 5 is a perspective view of an eccentric pusher, and FIG. 6 is a sectional view of another bearing device of the present invention corresponding to FIG. 3. 2, 3...Bearing device, 11...
Inner ring, 12... Outer ring, 31... Flange shaft, 312... Pressure transmission section, 33...
...Frame, 36, 40. ．． ．． ... Pressurized ball bearing, 38... Eccentric push.

Claims (1)

[Scope of Claims] 1. In a ball bearing, a flange shaft having a pressurized pressure transmitting portion coupled to an inner ring of the bearing and extending in an outer circumferential direction; A bearing device consisting of a pressurized ball bearing that comes into contact with a pressurized ball bearing. 2. In a ball bearing, a flange shaft having a pressurized pressure transmitting part connected to the inner ring of the bearing and extending in the outer circumferential direction, and a frame connected to the outer ring of the bearing are attached with bolts via an eccentric pusher, and the pressurized A bearing device consisting of a pressurized ball bearing that comes into contact with a transmission part. 3. In a ball bearing, a flange shaft having a pressurized pressure transmitting part coupled to the inner ring of the bearing and extending in the outer circumferential direction, and a contact between and interposed between the outer ring of the bearing or a frame coupled to the outer ring and the pressurized pressure transmitting part. A bearing device consisting of pressurized balls.