JPH06200926A - Double row ball bearing - Google Patents

Abstract

PURPOSE:To provide a double row ball bearing where an appropriate pre-load can be correctly and easily applied, the rigidity is excellent, the deflection accuracy of the shaft is improved, the vibration resistance is high, the assembly is easy and the manufacturing cost can be reduced. CONSTITUTION:A double row ball bearing consists of a shaft 1 and a sleeve 2, and an inner ring or an outer ring is fixed to the shaft or the sleeve by a connecting means such as adhesives by applying an appropriate pre-load to the inner ring 6 fitted to the shaft or the outer ring fitted to the sleeve.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double row ball bearing suitable for a rotating part of OA equipment.

[0002]

2. Description of the Related Art There is a type of ball bearing in which a groove for ball rolling is directly formed on a shaft, and this type is usually called a direct ball bearing. In the case of a single-row ball bearing having only one row of balls, this direct ball bearing can relatively easily align the rolling groove formed on the shaft and the outer ring with the ball. In the case of a double-row ball bearing having two rows, it is difficult to align the rolling grooves and balls that face each other.

Explaining this with reference to FIG. 12, in the case of a double-row direct ball bearing, two rolling grooves 101a and 101b are formed in the shaft 100 in the circumferential direction, and the outer ring 102 also has two rolling grooves. The grooves 103a and 103b are formed, and the balls 104a and 104b are sandwiched by the rolling groove of the shaft and the rolling groove of the outer ring, respectively.

In such a double-row ball bearing, the relationship between the distance A between the center lines of the left and right rolling grooves of the shaft and the distance B between the center lines of the rolling grooves of the outer ring is B> A or A>. Must be B.

In this case, if B is larger than A,
Alternatively, if A is larger than B, the amount of preload applied between the ball and the rolling groove becomes large, and the ball or rolling groove is deformed, resulting in a defective ball bearing.

In the conventional double-row direct ball bearing,
Direct rolling groove 101a of the shaft to the inner surface of one outer ring,
Rolling grooves 103a and 103b corresponding to 101b are respectively formed in advance.

[0007]

Therefore, the rolling grooves 103a and 103b of the outer ring must be accurately formed so as to correspond to the direct rolling grooves of the shaft, and the assembling of the outer ring to the shaft requires proper preload. Must be done so that the work is extremely precise, and once assembled, no further adjustment is possible.

The present invention makes it easy to apply a preload to the inner ring fitted to the shaft or the outer ring fitted to the sleeve, so that an appropriate amount of preload can be applied accurately and easily, and the rigidity is excellent and the runout accuracy of the shaft is high. It is possible to provide a double-row ball bearing that has improved vibration resistance, high vibration resistance, easy assembly, and reduced manufacturing cost.

[0009]

In order to achieve the above object, the main structure of the double-row ball bearing according to the present invention comprises a shaft and a sleeve, and is suitable for an inner ring fitted to the shaft or an outer ring fitted to the sleeve. The inner ring or the outer ring is fixed to the shaft or sleeve by applying various preloads.

[0010]

Embodiments of the present invention will be described below with reference to specific examples shown in the accompanying drawings. All of the examples are double-row ball bearings provided with a shaft and a corresponding sleeve for the outer ring. Figure 1
In the ball bearing, the rolling grooves 3 and 4 for one side row are formed on the outer peripheral surface of the shaft 1 and the inner peripheral surface of the sleeve 2 for the outer ring, respectively, and the balls 5 are provided between both rolling grooves 3 and 4. Further, the inner ring 6 is fixedly fitted to the shaft 1, and rolling grooves 7 and 8 for the other rows are formed on the outer peripheral surface of the inner ring 6 and the inner peripheral surface of the sleeve 2, respectively, and the rolling grooves for the other row are provided between both rolling grooves. A ball 9 is provided.

In order to manufacture this ball bearing, the inner ring 6 is fitted onto the shaft 1 so as to be slidable in the axial direction thereof, and the whole is made vertical, and the lower end of the shaft (the left end in FIG. 1) is received by a pedestal. The inner ring 6 is supported, and a pre-load is applied to the inner ring 6 from the upper end by a pressing body, and the inner ring 6 is fixed to the shaft 1 with an adhesive or the like in a state where the inner ring 6 is set at an appropriate position. In addition to the above, a method using a spring, a method using a shim, a spacer, or a screw can be used to apply a preload.

The ball bearing shown in FIG. 2 uses a stepped one having a small diameter shaft portion 1a on the shaft 1, and an inner ring is fixedly fitted to the small diameter shaft portion 1a. The rest has the same structure as that of FIG. Yes, at the time of manufacture, preload is applied to the inner ring 6 as in the case of FIG.

3 and 4 show the outer ring 1 for another row on the inner surface of the sleeve.
The ball 9 for the other row is arranged between the rolling groove 11 formed on the inner peripheral surface of the outer ring and the rolling groove 12 formed on the outer peripheral surface of the shaft. The one used for the sleeve is a straight one having the same inner diameter over the entire length, but the one shown in FIG. 4 has a stepped sleeve having an enlarged diameter portion 2a for expanding the inner diameter on the other row side in the sleeve. Used and
Others have the same structure.

In the ball bearings shown in FIGS. 3 and 4, each outer ring 10 is slidably fitted to the shaft at the time of manufacture, the whole is made vertical, and the lower end of the sleeve (the left end in FIGS. 3 and 4) is supported by a pedestal. It is manufactured by applying a preload to the outer ring from the upper end surface by the pressing body and fixing the outer ring to the shaft at an appropriate position with an adhesive or the like.

The ball bearings shown in FIGS. 5 and 6 use a stepped shaft having a small diameter shaft portion 1a as the shaft, and a sleeve having a stepped portion having an expanded diameter portion 2a is used. A bearing provided with a ball 9 is interposed between the small diameter shaft portion 1a and the enlarged diameter portion 2a of the sleeve.

In the manufacturing method shown in FIG. 5, the outer ring 10 is slidably fitted into the sleeve, and is supported by a pedestal with the left end of the sleeve down, and the outer ring 10 is preloaded with a pressing body to apply adhesive. Fix the outer ring into the sleeve.

In FIG. 6, the inner ring is slidably fitted on the small-diameter shaft 1a, and is supported by a pedestal with the left end of the shaft down, and the inner ring is pre-pressed by a pressing member and the inner ring 6 is glued.
Is fixed to the small diameter shaft 1a.

7 and 8 are provided with an outer ring 13 on one row side and an inner ring 6 on the other row side. The difference between them is that in FIG. In addition, although the shaft 1 is stepped, the one shown in FIG. 8 is different only in that the shaft and the sleeve are straight.

In the ball bearing shown in FIG. 7, the outer ring 13 is press-fitted into the sleeve and fixed by adhesion or the like, and is supported by a pedestal with the left end of the shaft facing down, for example, and the inner ring 6 is slidably fitted to the shaft, A preload is applied from above with a pressing body, and the inner ring is fixed to the shaft with an adhesive. Similar to the one shown in FIG. 7, the one shown in FIG.

9 and 10 show a ball bearing in which the sleeve also serves as the outer ring. In these embodiments, two inner rings 6a,
6b is fitted on the shaft 1, rolling grooves 7a, 7b are formed on the outer peripheral surfaces of the inner rings 6a, 6b, respectively, and rolling grooves 4, 8 corresponding to the rolling grooves of the inner ring are formed on the inner peripheral surface of the sleeve 2. They are formed respectively, and balls 5 and 9 are provided between the opposing rolling grooves,
One inner ring is fixed to the shaft, the inner ring is supported by a pedestal, the other inner ring is preloaded, and the inner ring is fixed to the shaft with an adhesive.

In FIG. 11, two rolling grooves 3 and 12 are formed in parallel on the shaft 1, and two outer races 13a having rolling grooves 4 and 8 facing the rolling grooves are formed on the inner peripheral surface. 13b, balls 5 and 9 are respectively provided between the outer races and the rolling grooves of the shaft, the outer races are provided in the sleeve 2, and one outer race is fixed in the sleeves and supported by a pedestal, and the other outer race is provided. Preload and assemble to the shaft.

[0022]

According to the present invention, either the inner ring fitted to the shaft or the outer ring fitted to the sleeve can be slid at the time of manufacture. Preload can be applied easily, therefore the pressure applied to the ball can be set properly by the rolling groove, the ball rotation accuracy and rigidity are excellent, the shaft runout accuracy is improved, and the vibration resistance is high.
Moreover, it is possible to provide a double-row ball bearing that is easy to assemble and can be manufactured at a reduced cost.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a first embodiment of the present invention.

FIG. 2 is a vertical sectional view showing a second embodiment of the present invention.

FIG. 3 is a vertical sectional view showing a third embodiment of the present invention.

FIG. 4 is a vertical sectional view showing a fourth embodiment of the present invention.

FIG. 5 is a vertical sectional view showing a fifth embodiment of the present invention.

FIG. 6 is a vertical sectional view showing a sixth embodiment of the present invention.

FIG. 7 is a vertical sectional view showing a seventh embodiment of the present invention.

FIG. 8 is a vertical sectional view showing an eighth embodiment of the present invention.

FIG. 9 is a vertical sectional view showing a ninth embodiment of the present invention.

FIG. 10 is a vertical sectional view showing a tenth embodiment of the present invention.

FIG. 11 is a vertical sectional view showing an eleventh embodiment of the present invention.

FIG. 12 is a vertical sectional view showing a conventional double-row direct ball bearing.

[Explanation of symbols]

 1 shaft 1a small diameter shaft 2 sleeve 2a expanded diameter 3 rolling groove 4 rolling groove 5 ball 6 inner ring 7 inner ring rolling groove 8 sleeve rolling groove 9 ball 10 outer ring 11 outer ring rolling groove 12 shaft rolling groove 13 Outer ring

Claims (7)

[Claims] 1. A double row comprising a shaft and a sleeve, wherein an inner ring fitted to the shaft or an outer ring fitted to the sleeve is applied with a proper preload to fix the inner ring or the outer ring to the shaft or the sleeve by a bonding means or the like. Ball bearings. 2. A shaft and a sleeve, wherein an outer peripheral rolling groove for one side row is formed on the shaft, and a ball is formed between the rolling groove and the inner peripheral rolling groove for one side row formed on the sleeve. And also
An inner ring for the other row is slidably fitted on the shaft, and a ball is provided between the outer circumferential rolling groove of the inner ring and the inner circumferential rolling groove for the other row formed on the sleeve, and the axis line of the inner ring is provided. A double row ball bearing in which the inner ring is fixed to the shaft by a connecting means such as adhesion by applying an appropriate preload in the direction. 3. A shaft and a sleeve, wherein the shaft is formed with an outer peripheral rolling groove for one side row, and between this rolling groove and an inner peripheral rolling groove for one side row formed in the sleeve. A ball is provided between the outer row rolling groove for the other row formed on the shaft and the inner circumferential rolling groove of the outer row for the other row slidably fitted in the sleeve. A double-row ball bearing in which the outer ring is fixed in the sleeve by connecting means such as adhesion by applying an appropriate preload in the axial direction. 4. A shaft and a sleeve, wherein an outer peripheral rolling groove for one side row is formed on the shaft, and a ball is formed between the rolling groove and the inner peripheral rolling groove for one side row formed on the sleeve. The inner ring of the ball bearing for the other row, which is provided with the inner ring and the outer ring, and has balls between the opposing rolling grooves of the both, is fitted on the shaft, and the outer ring is fitted in the sleeve, so that either the inner ring or the outer ring is fitted. A double row ball bearing in which an appropriate preload is applied in the axial direction of the crab and the inner ring or the outer ring is fixed to the shaft or the sleeve by a connecting means such as adhesion. 5. An outer ring for one side row which is formed with an outer peripheral rolling groove for one side row on the shaft and slidably or press-fitted with an inner ring for the other row and slidably or press-fitted into a sleeve. A ball is provided between the inner circumferential rolling groove and the outer circumferential rolling groove of the shaft, and a ball is placed between the outer circumferential rolling groove of the other row inner race and the other row inner circumferential rolling groove of the sleeve. A double-row ball bearing provided by fixing the inner ring or the outer ring or the inner ring and the outer ring to the shaft or the sleeve or the shaft and the sleeve by applying an appropriate preload to the inner ring or the outer ring or both. 6. A shaft and a sleeve, wherein an inner ring for one side row and an inner ring for the other row are fitted on the shaft so that at least one of them can slide, and each outer ring is formed with an outer peripheral rolling groove. , The inner peripheral rolling groove for one side row and the inner peripheral rolling groove for the other row are respectively formed in the sleeve, and between the outer peripheral rolling groove of each inner ring corresponding to each inner peripheral rolling groove of the sleeve. A double-row ball bearing in which balls are provided on the inner ring and the slidable inner ring is pre-loaded with an appropriate amount of pressure to fix the inner ring to the shaft. 7. An outer peripheral rolling groove for one side row and an outer peripheral rolling groove for another row are formed on a shaft, and corresponding outer rings for one side row and another row are provided in a sleeve for each row. A ball is provided between the outer peripheral rolling groove of the above and the inner peripheral rolling groove of the outer ring for each row, and one outer ring is fixed to the sleeve, and the other outer ring is fixed by applying a preload to this. Row ball bearings.