JP3159582B2 - Double row ball bearing - Google Patents

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 an office automation equipment.

[0002]

2. Description of the Related Art There is a type of ball bearing in which a ball rolling groove is formed directly on a shaft, and this type is generally called a direct ball bearing. In the case of a single-row ball bearing having only one row of balls, the direct ball bearing can relatively easily perform the alignment with the rolling grooves formed on the shaft and the outer ring and the ball, but the ball cannot be positioned. In the case of a double-row ball bearing having two rows, it is difficult to position the opposing rolling grooves and balls.

Referring 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 two rolling grooves are formed in the outer ring 102. Grooves 103a and 103b are formed, and balls 104a and 104b are sandwiched between the rolling grooves of the shaft and the rolling grooves 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 the rolling groove is deformed, resulting in a defective ball bearing.

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

[0007]

Accordingly, 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. The work must be extremely precise, and once assembled, no further adjustment is possible.

The present invention makes it possible to apply an appropriate amount of preload accurately and easily by facilitating the application of a preload to an inner ring fitted to a shaft or an outer ring fitted to a sleeve, thereby providing excellent rigidity and shaft runout accuracy. Thus, it is possible to provide a double-row ball bearing that has high vibration resistance, is easy to assemble, and can reduce manufacturing costs.

[0009]

In order to achieve the above-mentioned 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 a shaft or a sleeve by applying an appropriate preload.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to specific examples shown in the accompanying drawings. All of the embodiments are double row ball bearings having a shaft and a corresponding sleeve for an outer ring. FIG.
Ball bearings 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, with rolling grooves 3 and 4 for one side row, and a ball 5 is provided between the rolling grooves 3 and 4. Further, the inner ring 6 is fixedly fitted to the shaft 1, and rolling grooves 7 and 8 for other rows are formed on the outer peripheral surface of the inner ring 6 and the inner peripheral surface of the sleeve 2, respectively. Ball 9 is provided.

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

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

FIGS. 3 and 4 show an outer ring 1 for another row on the inner surface of the sleeve.
The ball 9 for the other row is disposed between the rolling groove 11 formed on the inner peripheral surface of the outer race and the rolling groove 12 formed on the outer periphery of the shaft. While the straight sleeve having the same inner diameter throughout the entire length is used for the sleeve, the one shown in FIG. 4 is a stepped sleeve having an enlarged diameter portion 2a in which the inner diameter of the other row is increased. Used and
The others have the same structure.

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

The ball bearing shown in FIGS. 5 and 6 uses a stepped shaft having a small-diameter shaft portion 1a, and a stepped sleeve having an enlarged-diameter portion 2a. The bearing provided with the ball 9 is interposed between the small-diameter shaft portion 1a and the enlarged-diameter portion 2a of the sleeve.

The manufacturing method shown in FIG. 5 is such that the outer ring 10 is slidably fitted into the sleeve, for example, the sleeve is supported with the left end of the sleeve down, and a preload is applied to the outer ring by a pressing body to apply the adhesive to the adhesive. To fix the outer ring into the sleeve.

In FIG. 6, the inner ring is slidably fitted on the small diameter shaft 1a, for example, supported by a cradle with the left end of the shaft down, a preload is applied to the inner ring by a pressing body, and the inner ring 6 is bonded with an adhesive.
Is fixed to the small diameter shaft 1a.

FIGS. 7 and 8 show an outer ring 13 provided on one side and an inner ring 6 provided on the other side. The difference between the two is that the one shown in FIG. And the shaft 1 is stepped, but the one shown in FIG. 8 differs only in that a straight shaft and sleeve are used.

In the ball bearing shown in FIG. 7, the outer ring 13 is press-fitted into a sleeve and fixed by bonding or the like. For example, the left end of the shaft is downwardly supported by a pedestal, and the inner ring 6 is slidably fitted on the shaft, and Preload is applied from above with a pressing body, and the inner ring is fixed to the shaft with an adhesive. 8, the inner ring is fixed to the shaft with an adhesive or the like by applying a preload similarly to the case of FIG.

FIGS. 9 and 10 show that the sleeve also functions as the outer ring.
2 shows a double row ball bearing. In these embodiments, the axial width is
Both are less than half the axial width of the sleeve 2
The inner races 6a and 6b are fitted on the shaft 1, rolling grooves 7a and 7b are formed on the outer peripheral surfaces of the inner races 6a and 6b, respectively, and rolling corresponding to the rolling grooves of the inner race is formed on the inner peripheral surface of the sleeve 2. Grooves 4 and 8 are formed respectively, and balls 5 and 9 are provided between the opposing rolling grooves. One inner ring is fixed to a shaft, the inner ring is supported by a pedestal, and the other inner ring is preloaded. And fix the inner ring to the shaft with adhesive.

FIG. 11 shows two outer races 13a in which two rolling grooves 3, 12 are formed in parallel on the shaft 1 and rolling grooves 4, 8 opposed to these rolling grooves are formed in the inner peripheral surface. 13b, balls 5 and 9 are provided between each outer ring and the rolling groove of the shaft, the outer ring is provided in the sleeve 2, one of the outer rings is fixed in the sleeve and supported by the pedestal, and the other Apply preload and assemble to shaft.

[0022]

According to the present invention, at the time of manufacturing, either the inner ring fitted on the shaft or the outer ring fitted on the sleeve is made to be slidable, so that the inner ring or the outer ring can be slid properly. The preload can be easily applied, so the pressure applied to the ball by the rolling groove can be set appropriately, the ball rotation accuracy and rigidity are improved, and the shaft runout accuracy is improved.
Moreover, it is possible to provide a double-row ball bearing that is easy to assemble and that can reduce manufacturing costs.

[Brief description of the drawings]

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

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

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

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

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

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

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

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

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

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

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

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

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 shaft 1a small diameter shaft portion 2 sleeve 2a enlarged diameter portion 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

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F16C 13/02 F16C 25/06

Claims (6)

(57) [Claims] An outer peripheral rolling groove for one side row is directly formed on an outer peripheral surface of a shaft , and the rolling groove and an inner peripheral surface of the one side row formed directly on an inner peripheral surface of the sleeve are provided. A ball is provided between the circumferential rolling grooves, and an inner race for another row is slidably fitted on the shaft, and the inner circumferential race of the inner race and the inner race of the sleeve are formed.
A ball is provided between the inner peripheral rolling groove for another row formed directly on the peripheral surface , and an appropriate preload is applied to the inner ring in the axial direction thereof, and the inner ring is fixed to the shaft by bonding means such as bonding. Become a double row ball bearing. 2. An outer peripheral rolling groove for a single side row is formed directly on the outer peripheral surface of the shaft, the inner peripheral surface of the rolling groove being formed directly on the inner peripheral surface of the sleeve. A ball is provided between the peripheral rolling grooves, and the external rolling grooves for other rows formed directly on the outer peripheral surface of the shaft are slidably fitted into the sleeve.
A ball is provided between the outer ring for the other row and the inner circumferential rolling groove of the outer row, and an appropriate preload is applied to the outer ring in the axial direction thereof, and the outer ring is fixed in the sleeve by bonding means such as bonding. Row ball bearings. 3. A shaft and a sleeve, wherein an outer peripheral rolling groove for one side row is directly formed on an outer peripheral surface of the shaft , and the rolling groove and an inner rolling surface for one side row formed directly on an inner peripheral surface of the sleeve. A ball is provided between the circumferential rolling grooves, and an inner ring and an outer ring are provided.Balls are provided between the opposing rolling grooves. Fit it in,
A double row ball bearing in which an appropriate preload in the axial direction is applied to either the inner ring or the outer ring, and the inner ring or the outer ring is fixed to the shaft or the sleeve by bonding means such as bonding. 4. An outer peripheral rolling groove for one side row is directly formed on an outer peripheral surface of a shaft , and an inner ring for another row is slidably or press-fitted, and slidably or press-fit into a sleeve. A ball is provided between the fitted inner circumferential rolling groove of the outer race for one side row and the outer circumferential rolling groove of the shaft, and is formed directly on the outer circumferential rolling groove of the inner race for the other row and the inner circumferential surface of the sleeve. A ball is provided between the inner row and the inner row rolling groove for another row, and an appropriate preload is applied to the inner ring or the outer ring or both to fix 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. Become a double row ball bearing. 5. A shaft and a sleeve , each having a width in the axial direction.
The inner ring for one side row and the inner ring for the other row, which are not more than half the axial width of the sleeve, are fitted to the shaft so that at least one of them can slide, and each inner ring has an outer peripheral rolling groove. Each inner ring is formed, and an inner peripheral rolling groove for one side row and an inner peripheral rolling groove for another row are directly formed on the inner peripheral surface of the sleeve, and the inner ring corresponding to each inner peripheral rolling groove of the sleeve. A deep groove double row ball bearing in which a ball is provided between the outer raceway grooves and a suitable preload is applied to the slidable inner race to fix the inner race to the shaft. 6. An outer peripheral rolling groove for one side row and an outer peripheral rolling groove for another row are respectively formed directly on the outer peripheral surface of the shaft, and corresponding outer races for one side row and another row are formed in the sleeve. Provided, a ball is provided between the outer peripheral rolling groove for each row and the inner peripheral rolling groove of the outer ring for each row, and one outer ring is fixed to a sleeve, and the other outer ring is applied with a preload. Double row ball bearing fixed.