JP2002168244A - Rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling bearing capable of largely reducing the number of man-hours for machining and assembling components compared with a usual double-row ball bearing of an all-ball type, and having low rotation torque in line with the reduced number of the man-hours but having a large radial-load capacity. SOLUTION: A raceway plane 11 composed of a cylinder surface is formed at a shaft 1 or at the external peripheral surface of an inner ring, and the raceway plane 11 is axially divided with a holding plate 2 fixedly inserted into the shaft 1 or into the inner ring. Each ball row 3a, 3b is disposed at each divided raceway plane 11a, 11b. Corresponding to either one ball row 3a of 3a, 3b, a raceway plane 41 composed of an inner cylinder surface is formed at an outer ring 4, and a collar 42 is formed at the external edge of the outer ring. A large-diameter hole 43 larger than the raceway plane 41 is formed corresponding to another ball row 3b to fix a side plate comprising a cylinder section 51 and an inner flange section 52, and both outside and the inside of each ball row 3a, 3b are held by the cylinder surface. The axial position of each ball is controlled by the holding plate 2 and the collar 42, or by the holding plate 2 and the inner flange section 52 of the side plate 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a rolling bearing,
More specifically, a rolling bearing having the balls of the double row rolling bearing relates particularly suited for use at a site rotational accuracy is not much required.

[0002]

BACKGROUND ART double row radial ball bearing is generally to illustrate axially parallel sectional view of FIG. 4 and FIG. 5, two rows of raceway surfaces 61a on the outer peripheral surface of one of the inner ring 61, to form a 61b Each of the raceways 61 of the inner ring 61 also has a single outer ring 62.
a, raceway surfaces 62a of the two rows so as to correspond to 61b, 62b to form, takes a structure in which a plurality of balls 63 rollably respective two rows ball trajectory formed between these. 4 shows a type in which ball insertion grooves 64 for inserting balls 63 into respective ball tracks are formed at both ends (only one end is shown in FIG. 4) of the inner ring 61 and the outer ring 62, and FIG. What is shown indicates the type that does not have it.

The ball insertion groove 64 is for making it possible to adopt a full ball type. In the structure illustrated in FIGS. The ball is rolled while being held at a certain interval in the direction, but the total ball type does not have the retainer 65, and inserts more balls 63 into each ball orbit, and Is a type that regulates its circumferential position by interfering with each other, and has a larger load capacity.

[0004]

Among the double row ball bearings of each type as described above, the type shown in FIG. 4 in which the ball receiving groove 64 is formed can be a full ball type. Excessive man-hours are required for the processing of the ball insertion groove 64 and the operation of inserting the ball into each ball trajectory via the ball insertion groove 64, resulting in a problem of high cost.

On the other hand, the type shown in FIG. 5 in which the ball insertion groove 64 is not formed has a disadvantage that it cannot be a full ball type. Here, the low rotational torque and
For bearings that require relatively large radial load capacity,
It is most appropriate to use all-ball type double row ball bearings, but when rotation accuracy is not so required,
In order to use a double row ball bearing having a ball insertion groove and a total ball type, there is a case where it is inevitable in terms of cost, and inevitably other rolling bearings, sliding bearings or the like must be employed.

[0006] The present invention has been made in view of such circumstances, and in applications where rotational accuracy is not so much required, the number of processing steps for parts is smaller than that of a conventional full-ball type double row ball bearing. It is another object of the present invention to provide a rolling bearing having substantially the same small rotational torque and large radial load capability while significantly reducing the number of assembly steps.

[0007]

In order to achieve the above object, a rolling bearing according to the first aspect of the present invention has an inner raceway surface formed of a cylindrical surface on the outer peripheral surface of a shaft or an inner race. Is divided axially into two by a disk-shaped support plate press-fitted and fixed to the outer peripheral surface of the shaft or inner ring, and a ball row composed of a plurality of balls is provided on each of the divided inner ring raceway surfaces. An outer ring raceway surface consisting of an inner cylindrical surface is formed on the outer ring arranged to roll freely and arranged so as to include both ball rows, corresponding to the inner ring raceway surface on which one of the ball rows rolls. An outer raceway surface of the outer raceway surface is formed with a flange portion protruding inward and positioned on the axially outer end side of the one ball row, and an inner race on which the other ball row rolls. The outer ring raceway surface corresponding to the raceway surface A hole with a larger diameter is formed, and in this hole, a side plate formed by integrating a cylindrical portion and an inner flange portion is fixed in a state where the inner flange portion is located on the outer end side in the axial direction, The inner peripheral surface of the cylindrical portion of the side plate forms an outer raceway surface on which the other ball row rolls, and the inner side surface of the inner flange portion regulates the position of the other ball row on the axially outer end side. It characterized by being configured to.

On the other hand, in order to achieve the same object, claim 2
Rolling bearing of the invention according to, instead of the outer ring according to claim 1, corresponding to one row of balls above, holes of the hole the same diameter are formed in correspondence with the other ball row formed Having the outer ring, the same side plate as the above side plate is fixed to a hole formed corresponding to one of the ball rows in a state where the inner flange portion is located on the outer end side in the axial direction, and the cylindrical portion thereof is formed. Is formed so that the inner peripheral surface forms an outer raceway surface on which one ball row rolls, and the inner side surface of the inner flange portion regulates the position of the one ball row on the axially outer end side. It is characterized by being.

Here, in the invention according to claim 2,
The outer ring, the support plate, and the side plates may be each formed by press-forming a metal plate (claim 3).

The present invention is directed to a rolling bearing having a double ball array between a shaft or an inner ring and an outer ring, but having a structure that can be of a full ball type without providing a ball-in groove. By providing this, the intended purpose is achieved.

That is, according to the first aspect of the present invention, an inner raceway surface formed of a cylindrical surface is formed on the outer peripheral surface of the shaft or the inner race, and this is formed into a disk-shaped support pressed into the outer peripheral surface of the shaft or the inner race. The plate is divided into two parts in the axial direction, and a ball row is arranged on each of these parts. The outer race forms an outer raceway surface made of an inner cylindrical surface corresponding to one ball row, and a flange protruding inward on the outer end side thereof, and the outer raceway surface corresponds to the other ball row. Forming a hole with a larger diameter than
A side plate having a cylindrical portion and an inner flange portion is press-fitted and fixed in the hole. Then, an outer raceway surface on which the other ball row rolls is formed by the inner peripheral surface of the cylindrical portion of the side plate, and the position of the other ball row on the axial outer end side is regulated by the inner side surface of the inner flange portion. With such a configuration, one ball row has a shaft or a raceway surface formed of a cylindrical surface on the outer periphery of the inner ring,
Rolling occurs between the raceways formed by the inner cylindrical surface on the inner periphery of the outer ring while the axial position is regulated by the support plate and the flange of the outer ring. The other ball row has an axial position between a raceway surface formed of a cylindrical surface on the outer periphery of the shaft or the inner ring and a raceway surface formed of an inner cylindrical surface on the inner periphery of the side plate cylindrical portion by a support plate and a side plate inner flange portion. It rolls in a regulated state, and becomes a rolling bearing provided with a double row of ball rows.

Since the hole formed on the other ball row is larger than the outer raceway surface on which one ball row rolls, the hole can be easily assembled, for example, by the following method. First, in a state where the support plate is fixed to the shaft or the inner ring, and before fixing the side plate to the hole of the outer ring, one ball row is substantially circumferentially aligned along the raceway surface of the outer ring through the hole of the outer ring. In the state of being densely inserted, the shaft or the inner ring is inserted from the hole side into the outer ring, and then each ball of the other ball row is inserted into the hole of the outer ring by the same number as the one ball row, By fixing the side plate to the hole of the outer race, it is possible to obtain a rolling bearing provided with a double ball row of a total ball type without providing a ball insertion groove.

The invention according to claim 2 does not use the structure on the outer ring side corresponding to the above-mentioned one ball row, that is, without using the raceway surface formed on the inner peripheral surface of the outer ring and the flange formed on the outer end thereof, One of the ball rows also employs a structure on the outer ring side corresponding to the other ball row, that is, a structure including a hole and a side plate fixed to the hole. Without providing the rolling bearing, it is possible to obtain a rolling bearing having a double ball row of a total ball type.

A third aspect of the present invention aims at obtaining the configuration of the second aspect of the present invention at a lower cost, and may be employed, for example, when the outer ring is used as it is as a wheel of a toy racer car. You can do it. That is,
By forming the outer ring, the support plate, and the side plates on both sides as a press-formed product of a metal plate, it can be manufactured at low cost, and can be sufficiently used for applications such as wheels of a toy racer car.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an axially parallel sectional view showing the configuration of the first embodiment of the invention. This example shows an example in which a raceway surface 11 formed of a cylindrical surface for the inner ring is formed on the outer peripheral surface of the shaft 1 without using the inner ring. The raceway surface 11 of the shaft 1 is axially divided into two by a disc-shaped support plate 2 with a hole that is press-fitted and fixed to the outer periphery of the shaft 1, and has one raceway surface 11 a and the other raceway surface 11 a. Track surface 11b
, A ball row 3a composed of a plurality of balls 3
3b is arranged so that it can roll freely. Each ball row 3a, 3
b is without a retainer, a circumferential most rows of balls full-ball type without mutual gaps.

The outer race 4 is arranged so as to include both the ball rows 3a and 3b, and has an inner peripheral surface provided on its inner peripheral surface at a position corresponding to one of the ball rows 3a.
1 is formed, an inward flange 42 is integrally formed at the outer end thereof, and a cylinder having a larger diameter than the outer raceway surface 41 is provided at a position corresponding to the other ball row 3b. A hole 43 is formed. The side plate 5 is fixed to the inner peripheral surface of the hole 43 by press fitting.

The side plate 5 has a shape in which an inner flange portion 52 is integrally formed at one end of a cylindrical portion 51, and the inner diameter of the inner peripheral surface 51 a of the cylindrical portion 51 is the inner diameter of the raceway surface 41 of the outer ring 4. Equal to dimensions. Further, the inner flange portion 52 is disposed so as to be located outside, and the inner side surface 52 of the inner flange portion 52 is provided.
The dimension between a and the opposing surface 2b of the support plate 2 is equal to the dimension between the inner side surface 42a of the flange 42 of the outer race 4 and the opposing surface 2a of the support plate.

In the above configuration, one of the ball rows 3a
Each ball 3 moves between one raceway surface 11a of the shaft 1 and the raceway surface 41 of the outer race 4 between the one surface 2a of the support plate 2 and the outer race 4
The roller 42 rolls while its axial position is regulated by the inner side surface 42a of the flange 42. Also, each ball 3 of the other ball row 3a
Is formed between the other raceway surface 11b of the shaft 1 and the inner peripheral surface 51a of the cylindrical portion 51 of the side plate 5 in the axial direction by the other surface 2b of the support plate 2 and the inner side surface 52a of the inner flange portion 52 of the side plate 5. The rolling is performed while the position is regulated, and as a whole, a rolling bearing having a double ball row of a total ball type is constituted.

In order to assemble the above-described embodiment, the support plate 2 is previously mounted in a state where the required number of balls 3 of one of the ball rows 3a are inserted into the raceway surface 41 of the outer race 4 on which the side plate 5 is not mounted. The fixed shaft 1 is inserted from the hole 43 side of the outer race 4, and the ball row 3 a is sandwiched between the flange 42 and the surface 2 a of the support plate 2. Next, the same number of balls 3 for the other ball row 3b are inserted into the hole 43 side of the outer race 4 as well.
By press-fitting and fixing the side plate 5 to the inner peripheral surface of the rolling bearing 3, a rolling bearing having the structure shown in FIG. 1 can be obtained.
A rolling bearing having a double ball row of a full ball type can be obtained by a simple operation without forming ball insertion grooves in the shaft 1 and the outer ring 4.

Next, an embodiment of the invention according to claim 2 will be described. FIG. 2 is an axially parallel sectional view thereof. The feature of this example is that the outer ring structure on the side of one ball row 3a is shown in FIG.
This is equivalent to the outer ring structure on the other ball row 3b side in the embodiment of the present invention, and is characterized in that both sides of the axial center are symmetrical as a whole. That is, the shaft 1, the support plate 2, and each of the ball rows 3a, 3b are the same as those in the example of FIG. 1, and the outer race 4 'has a hole 430 having a uniform circular cross section on its inner peripheral surface. The same side plate 5 as in the previous example is press-fitted into the inner peripheral surface of the hole 430 on the other ball row 3b side, and the equivalent one end side of the cylindrical portion 501 is also mounted on one ball row 3a side. The side plate 50 on which the inner flange portion 502 is formed is press-fitted.

In such a configuration, each ball 3 of one ball row 3a moves between one raceway surface 11a of the shaft 1 and the inner peripheral surface 501a of the cylindrical portion 501 of the side plate 50 by the support plate 2a.
Of the side plate 50 and the inner side surface 502a of the inner flange portion 502 of the side plate 50. Also, for each ball 3 of the other ball row 3b, the other raceway surface 11b of the shaft 1 and the side plate 5
Between the inner peripheral surface 51a of the cylindrical portion 51 and the other surface 2b of the support plate 2 and the inner side surface 52a of the inner flange portion 52 of the side plate 5.
The rolling is performed while the axial position is regulated by this, thereby forming a rolling bearing provided with a double ball row 3a, 3b of the full ball type, as in the previous example.

In order to assemble the rolling bearing of the example shown in FIG. 2, the shaft 1 on which the support plate 2 is press-fitted and fixed in advance is passed inside the outer ring 4 'without mounting the side plates 5 and 50.
For example, after inserting the required number of balls 3 of the ball row 3a into the upper surface of the support plate 2 with one surface 2a side facing up,
The side plate 50 is press-fitted and fixed in the hole 430 of the outer ring 4 '. Then, after the required number of balls 3 of the ball row 3b are inserted into the upper surface of the support plate 2 with the other surface 2b side facing upward, the side plate 5
May be press-fitted into the hole 430 of the outer race 4 '.

Here, in each of the above embodiments, the shaft 1, the side plates 5, 50, and the outer ring 4 or 4 'are machined products made of metal such as bearing steel, for example. Steel, ceramic, stainless steel, and resin can be selected as appropriate according to the application and the like. When bearing steel is used, the cost is reduced, and when ceramic is used, high speed and rust prevention are achieved. When stainless steel is used, rust prevention can be achieved, and when resin is used, weight reduction and rust prevention can be achieved. Also, the side plates 5 and 50 are formed by pressing a metal plate,
Alternatively metal may be employed any of materials and the machined components.

Further, in each of the above embodiments, an example is shown in which the outer peripheral surfaces of the outer races 4 and 4 'are convex curved surfaces. However, the present invention is not limited to this. Of course.

Next, an embodiment of the invention according to claim 3 will be described. FIG. 3 is an axially parallel sectional view thereof. In this example, the basic structure is the same as that of FIG. 2, but the main purpose is to manufacture it at a lower cost. The shaft 1 and the support plate 2 are the same as those in the previous examples. The ball 3 is also a machined product, and the ball 3 can be selected as described above. The feature is the side plates 5,5 on both sides
In addition to the above, the outer ring 40 is also formed by pressing a metal plate, so that the outer ring 40 can be manufactured at a lower cost as compared with the previous embodiments. The outer ring 40 in this example is
It has a shape in which an inner peripheral cylindrical portion 401 and an outer peripheral convex curved surface portion 402 are connected at one end. In the rolling bearing having such a structure, for example, the outer ring 40 can be used as a wheel by simply fixing the shaft 1 to a chassis such as a toy race car.

Here, the wheel structure of a conventional toy racer car has a fixed shaft S fixed to the vehicle body, as shown in a sectional view in FIG. A structure in which a certain wheel W is rotatably supported at both ends thereof via metals M1 and M2 is often used. In such a structure, since the metal M1 and M2 are used, the torque required for rotation is large, and accordingly, it is determined that the speed is hardly increased.

[0027] In contrast, in the structure using the outer ring 40 by fixing the shaft 1 of the embodiment of FIG. 3 to the vehicle body as the wheel, an outer ring 40 which constitutes the wheel is supported by a rolling contact with respect to the axis 1 Therefore, the torque required for rotation can be reduced, and the speed can be increased even if the same drive source is used.

In each of the above-described embodiments, the raceway surfaces 11a, 11 each formed of a cylindrical surface for an inner ring are formed on the outer peripheral surface of the shaft 1.
Although an example in which the inner ring 1b is formed and the inner ring is not used has been described, it is a matter of course that a ring-shaped inner ring may be used instead of the shaft and the raceway surfaces 11a and 11b formed of cylindrical surfaces may be formed on the outer peripheral surface. .

[0029]

As described above, according to the first aspect of the present invention, the support plate having the cylindrical orbital surface formed on the surface of the shaft or the inner race, and the raceway surface being press-fitted and fixed to the shaft or the inner race. In the axial direction, the ball row is arranged corresponding to each divided raceway surface, and the outer ring arranged so as to include each ball row corresponds to one ball row. A raceway surface consisting of an inner cylindrical surface and an inward flange formed at the outer end thereof, and a hole having a larger diameter than that of the other ball row are provided.
A side plate consisting of a cylindrical portion and an inner flange portion is fixed, and each ball of one ball row is positioned between the raceway surface of the shaft or the inner ring and the raceway surface of the outer ring while the axial position is regulated by the support plate and the flange. Each ball of the other ball row rolls between the raceway surface of the shaft or inner ring and the inner peripheral surface of the cylindrical portion of the side plate while the axial position is regulated by the inner surface of the inner flange portion of the support plate and the side plate. Therefore, a rolling bearing having a double-row ball row of a full-ball type can be provided without providing a ball-in groove and with a simple assembling operation, and therefore at a low cost. can get.

According to the second aspect of the present invention, the same side plates as those described above are provided on the inner peripheral surface of the outer ring corresponding to both the shaft divided by the support plate or the two raceway surfaces of the inner ring as described above. Is fixed, and each ball of each ball row is configured to roll between the raceway surface of the shaft or inner ring and the inner peripheral surface of each side plate while regulating the axial position by the support plate and the side plate, respectively. Therefore, it is possible to obtain a rolling bearing provided with a double ball row of a total ball type without forming a ball insertion groove in the same manner as described above and under a simple assembling operation.

Further, in the invention according to claim 3, the outer ring, the side plates, and the support plate in the invention according to claim 2 are each formed by pressing a metal plate to further reduce the cost. For example, by using it for a wheel of a toy racer car, high speed can be achieved because it is inexpensive and requires less torque than a conventional wheel structure.

[Brief description of the drawings]

FIG. 1 is an axially parallel sectional view of an embodiment of the invention according to claim 1;

FIG. 2 is an axially parallel sectional view of the embodiment of the invention according to claim 2;

FIG. 3 is an axially parallel sectional view of the embodiment of the invention according to claim 3;

FIG. 4 is an axially parallel sectional view showing a configuration example of a conventional double-row radial ball bearing provided with a ball insertion groove.

FIG. 5 is an axially parallel cross-sectional view showing a configuration example of a conventional double-row radial ball bearing having no ball insertion groove.

FIG. 6 is a sectional view showing an example of a wheel structure of a conventional toy racer car.

[Explanation of symbols]

 Reference Signs List 1 shaft 11 track surface 2 support plate 3 ball 3a, 3b ball row 4, 4 ', 40 outer ring 41 track surface 42 flange 43, 430 hole 5, 50 side plate 51, 501 cylindrical portion 52, 502 inner flange portion

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shoichi Inoue 3-5-8 Minamisenba, Chuo-ku, Osaka-shi, Osaka F-term (reference) 3J101 AA02 AA32 AA43 AA52 AA62 AA72 BA23 BA45 BA53 BA54 BA56 DA09 EA02 FA44 FA46 GA60

Claims (3)

[Claims] An inner raceway surface formed of a cylindrical surface is formed on an outer peripheral surface of a shaft or an inner ring, and the inner raceway surface is formed in an axial direction by a disk-shaped support plate press-fitted and fixed to an outer peripheral surface of the shaft or the inner race. A ball row composed of a plurality of balls is arranged on each of the two divided inner ring raceway surfaces so as to roll freely, and an outer ring arranged to include both of the ball rows includes: An outer raceway surface composed of an inner cylindrical surface is formed corresponding to the inner raceway surface on which one of the ball trains rolls. A flange having a position on the outer end side in the direction is formed, and a hole having a diameter larger than the outer ring raceway surface is formed corresponding to the inner raceway surface on which the other ball row rolls, and this hole is formed in the hole. The cylindrical part and inner flange part are not integrated. The side plate is fixed in a state where the inner flange portion is positioned on the outer end side in the axial direction, and the inner peripheral surface of the cylindrical portion of the side plate forms an outer raceway surface on which the other ball row rolls, and A rolling bearing, wherein the inner side surface of the flange portion is configured to regulate the position of the other ball row on the axially outer end side. 2. An outer ring in which a hole having the same diameter as the hole formed in the one ball row is formed in place of the outer ring described in claim 1 in correspondence with the one ball row. In the hole formed corresponding to one of the ball rows, the same side plate as the above side plate is fixed with the inner flange portion located on the axially outer end side, and the inner periphery of the cylindrical portion The surface forms an outer raceway surface on which one ball row rolls, and the inner side surface of the inner flange portion is configured to regulate the position of the one ball row on the axially outer end side. Rolling bearing characterized. 3. The rolling bearing according to claim 2, wherein the outer ring, the support plate, and the side plates are press-formed products of a metal plate.