JPH10213147A - Method of assembling deep groove ball bearing without single row entry slot - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deep groove ball bearing without single row entry slots, that can be assembled even in case of being larger in shoulder height dimension than a conventional one so as to have large axial load capacity. SOLUTION: An inner ring 2 is inclined in relation to an outer ring 3. In this state, the inner ring 2 is relatively moved toward the outer ring 3 to insert a shoulder 5 of the inner ring 2 in a raceway groove 6 of the outer ring 3. On the opposite side to an insert position, balls 4 are inserted in regular order along the raceway groove 6 of the outer ring 3 from an opening 7 larger than the ball diameter Da, formed between the inner ring 2 and outer ring 3. The inclination of the inner ring is set back to the original state, and at the same time, the center of the inner ring 2 is made coincide with the center of the outer ring 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for assembling a single-row deep groove ball bearing without a groove.

[0002]

2. Description of the Related Art As shown in FIG. 8, the height dimension of a shoulder b of a single-row deep groove ball bearing a without a groove is less than 0.25 Da (Da = ball diameter) due to a limitation by an assembling method. 0.2
It is set to around Da. As an assembling method, as shown in FIG. 9, the inner ring c is moved (eccentric) in the radial direction with respect to the outer ring d in the same plane, and a semilunar opening e formed between the inner ring c and the outer ring d. , The ball f is sequentially inserted along the raceway g of the outer ring d, and in the final stage, a force is applied to the inner ring c until the inner ring c becomes concentric with the outer ring d to deform the outer ring d elastically. We try to secure a number.

[0003]

By the way, in order to prevent the ball from riding on the deep groove ball bearing even under a high axial load, a measure to increase the R dimension of the raceway groove or to reduce the radial clearance is as follows. It is conceivable to adopt a type with a groove or to make the shoulder height dimension larger than before.

[0004] However, when the raceway R dimension is increased, the contact surface pressure between the race rings is increased, so that the life is shortened. When the radial clearance is reduced, there is a problem that burning may occur.

Further, in the case of the type with a groove, the ball comes into contact with the groove because the groove reaches near the center of the track groove. Therefore, if the axial load is large, the ball is damaged. Occurs.

Furthermore, if the height of the shoulder is made larger than before, the conventional method of assembling the inner race in the same plane as described above cannot secure a space for inserting a ball between the inner race and the outer race, or Even if the ball insertion space can be secured, it is impossible to insert a sufficient number of balls, and it is impossible to manufacture a bearing.

Here, as a result of intensive studies by the present inventors,
With regard to a bearing of a specific size, it has been found that a sufficient ball insertion space can be secured at the time of assembling by changing the method of assembling the bearing even if the shoulder height dimension is made larger than before, and the present invention has been completed. Was.

The present invention has been made on the basis of such technical background, and it is possible to assemble a bearing even if the shoulder height is made larger than before so that a single-row groove without a deep groove having a high axial load capability is provided. It is an object of the present invention to provide a method of assembling a single-row slotless deep groove ball bearing capable of providing a ball bearing.

[0009]

In order to achieve the above object, a method for assembling a single row grooved deep groove ball bearing according to the present invention comprises disposing a large number of balls between an inner ring and an outer ring. In the method of assembling a single row grooved deep groove ball bearing, the inner ring is inclined with respect to the outer ring, and in this state, the inner ring is relatively moved toward the outer ring, and the shoulder of the inner ring is inserted into the raceway of the outer ring, Next, balls are sequentially inserted along the raceway of the outer ring from the opening larger than the diameter of the ball formed between the inner ring and the outer ring on the opposite side of the insertion position, and then the inclination of the inner ring is returned to its original state. The center of the inner ring is matched with the center of the outer ring.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is an illustrative cross-sectional view of a single row grooved deep groove ball bearing assembled by a method of assembling a single row grooved deep groove ball bearing according to an embodiment of the present invention. FIG. 6 is an explanatory diagram for explaining a method of determining the maximum number of balls to be incorporated, and FIG. 6 is an explanatory diagram for explaining a method of assembling a single-row grooved deep groove ball bearing which is an example of an embodiment of the present invention. .

In FIG. 1, reference numeral 1 denotes a single-row deep groove ball bearing without a groove formed by arranging a large number of balls 4 between an inner ring 2 and an outer ring 3. This bearing 1 has both an inner ring 2 and an outer ring 3. Shoulder 5
Is 0.25 Da when the diameter of the ball 4 is Da.
That is all.

Next, a method of assembling a single-row grooveless deep groove ball bearing 1 according to an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. First, the inner race 2 is tilted to the left in the axial direction in FIG. 6 with respect to the outer race 3, and in this state, the inner race 2 is moved upward to insert the axially right shoulder 5 of the inner race 2 into the raceway 6 of the outer race 3. At the time of such insertion, the distance b between the axially left shoulder 5 of the inner ring 2 and the axially right shoulder 5 of the outer ring 3 on the opposite side (lower side) of the insertion position is set to be larger than the ball diameter Da. Thereby, the insertion portion (opening) 7 of the ball 4 is secured.

Then, the raceway 6 of the outer race 3 from the insertion portion 7
A first insert a single ball 4 _1, then該玉4 ₁ of the ball 4 ₂ in the circumferential direction on both sides position, 4 _3, 4 ₄ ... 4 _n the circumference of the balls 4a along the track groove 6 by two, respectively The inner ring 2 is returned to its original inclination while the center of the inner ring 2 is aligned with the center of the outer ring 3, thereby completing the assembly.

Next, a method of determining the maximum number of balls to be incorporated between the inner race 2 and the outer race 3 will be described with reference to FIGS. 2 is a view showing a state before the inner ring 2 is tilted, FIG. 3 is a view showing a state in which the inner ring 2 is tilted with respect to the outer ring 3, and FIG.
FIG. 5 is a conceptual diagram viewed from the direction of arrow A, and FIG.
It is a XX line sectional conceptual diagram in the angle C position centering on _e0 .

In FIG. 3, the relative displacement in the radial direction of the inner ring 2 with respect to the outer ring 3 is V, and the relative displacement in the horizontal direction is h.
And the relative inclination angle is θ, the following equations (1) to (5) hold only when V, h, and θ are small.

[0016] That _{is, S yc = h + (R} i + r i) sinθcosC ... in FIG. _{5 (1) S zc = VcosC} + (R i + r i) cosθ ... (2) P _ic Q _ec = - to ^{_{{S 2 yc + (S zc}} (R e -r e)) 2} 1/2 ... (3), When the _{P ic Q ec ≦ r i +} r e -Da ... minimum C that satisfies (4) and C _min, the maximum number of balls incorporated may (Z _max) is, Z (integer satisfying the expression (5) ) Is the largest one.

[0017] ^{2 (Z-1) sin -1} (Da / (2R e -Da)) ≦ 2Π-2C min ... (5) where, Da: ball diameter r _i: inner ring groove radius r _e: outer ring groove radius R _i: 1/2 R _e of the inner ring groove bottom diameter: 1/2 P _i of the outer ring groove bottom diameter: C = 0 center position of the inner ring groove radius at P _ics: the center position of the inner ring groove radius at position C Q _e : center position of the outer ring groove radius at C = 0 Q _ec: center position of the outer ring groove radius at position C O _i0: inner ring groove center circle of center O _e0: the center of the outer ring groove center circle P _ic O _'i0 = R _{i + r i Q eC O '} e0 = R e -r e Thus, in this embodiment, even when the shoulder height of the inner ring 2 and outer ring 3 is made larger than conventional or 0.25Da, sufficiently during assembly To provide a single-row slotless deep groove ball bearing with greatly improved axial load capacity, because a large ball insertion space can be secured. It is possible.

In the above-described embodiment, an open type bearing is described. However, at least one of the inner ring 2 and the outer ring 3 is provided with a step on one side or both sides in the axial direction to provide a seal or shield type. The present invention may be applied to the above-mentioned bearing. FIG. 7 shows an example in which step portions 8 are provided on both axial side surfaces of the inner ring 2 and the outer ring 3.
By providing the step portion 8 in this manner, an effect that the ball 4 can be more smoothly inserted from the insertion portion 7 can be obtained.

In the above-described embodiment, the shoulder height of both the inner ring 2 and the outer ring 3 is 0.25 Da or more. However, the present invention is not limited to this. The dimension may be 0.25 Da or more.

[0020]

EXAMPLE Two BAS608 single row grooved deep groove ball bearings were prepared, one of which was a conventional example in which the shoulder height was 0.14 Da for both the inner and outer rings, and the other was the shoulder height for both the inner and outer rings. The example of the present invention was made with a height dimension of 0.30 Da. As a result of calculating the allowable axial load of the conventional example and the present invention, the conventional example is 75 kgf, whereas the present invention is 370 kgf, which is about five times that of the conventional example.

[0021]

As is apparent from the above description, according to the present invention, a sufficient ball insertion space can be secured at the time of assembling even if the shoulder height dimension is 0.25 Da or more, as compared with the conventional art. The effect is obtained that it is possible to provide a single row grooved deep groove ball bearing with greatly improved axial load capability.

[Brief description of the drawings]

FIG. 1 is an explanatory cross-sectional view of a single row grooved deep groove ball bearing assembled by a method of assembling a single row grooved deep groove ball bearing as an example of an embodiment of the present invention.

FIG. 2 is an explanatory diagram for explaining a method of determining the maximum number of balls.

FIG. 3 is an explanatory diagram for explaining a method of determining the maximum number of balls.

FIG. 4 is a conceptual diagram viewed from the direction of arrow A in FIG. 3;

FIG. 5 is a conceptual sectional view taken along line XX of FIG. 4;

FIG. 6 is an explanatory diagram for explaining an assembling method of a single-row grooved deep groove ball bearing which is an example of an embodiment of the present invention.

FIG. 7 is an explanatory sectional view for explaining another embodiment of the present invention.

FIG. 8 is an explanatory cross-sectional view illustrating a conventional single-row deep groove ball bearing without a groove.

FIG. 9 is an explanatory diagram for explaining a method of assembling a conventional single row grooved deep groove ball bearing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Single row deep groove ball bearing without groove 2 ... Inner ring 3 ... Outer ring 4 ... Ball 5 ... Shoulder 6 ... Track groove of outer ring 7 ... Insertion part (opening) Da ... Ball diameter

Claims (1)

[Claims] In a method of assembling a single row grooved deep groove ball bearing having a number of balls disposed between an inner ring and an outer ring, the inner ring is inclined with respect to the outer ring, and the inner ring is connected to the outer ring in this state. And the shoulder of the inner race is inserted into the raceway of the outer race, and then the raceway of the outer race is formed through an opening larger than the diameter of the ball formed between the inner race and the outer race on the opposite side of the insertion position. Characterized in that the balls are inserted sequentially along the inner ring, and then the inclination of the inner ring is returned to the original state, and at the same time, the center of the inner ring coincides with the center of the outer ring.