JP2500976Y2 - Bearings with split races - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention, as represented by a cross roller bearing, has a divided raceway in which the race is divided into two parts on a plane perpendicular to the central axis. The present invention relates to a bearing having a ring. More specifically, the present invention relates to a bearing having a split race ring that can be accurately assembled.

[Conventional technology]

As the bearing, there is known a bearing in which a race ring such as an inner ring or an outer ring is divided into two parts on a plane perpendicular to the central axis so that rolling elements such as balls and rollers can be mounted. The cross roller bearing is provided with a race ring of this type, for example, the outer ring has a split structure. In this case, after positioning one side of the outer ring divided into the outer circumference of the inner ring, the rollers, which are rolling elements, are alternately arranged in a V-shaped raceway groove formed on the outer circumferential surface of the inner ring in an orthogonal state. After that, the other side of the divided outer ring is assembled.

[Problems to be Solved by the Invention] Here, it is necessary to accurately perform the so-called track alignment work for assembling the outer ring having such a divided structure. In such work, a jig such as a V-shaped block is usually used to accurately combine the outer rings with each other.
However, depending on such assembly work, it is usually about 10μ.
There is a possibility that an assembling error may occur before and after, and it may be unsuitable for use in some cases.

In view of this point, an object of the present invention is to realize a bearing in which divided races can be assembled with high accuracy.

[Means for solving the problem]

In order to solve the above-mentioned problems, in the present invention, in a bearing of the type in which the bearing ring is composed of a first bearing ring and a second bearing ring divided into two planes perpendicular to the central axis, the first bearing ring In the mating surface with the second bearing ring, at least two or more positioning knock pins are planted, and the knocking pin of the second bearing ring is fitted to the mating surface side with the first bearing ring. A structure is adopted in which pin holes into which these knock pins can be fitted are formed at positions corresponding to the respective positions.

[Action]

In the bearing of this configuration, the pin hole on the side of the second bearing ring is positioned with respect to the knock pin implanted in the first bearing ring, and in this state, the second pin is attached to the second bearing ring.
By assembling the bearing ring, the bearing ring will be assembled without any substantial error.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

As shown in these figures, the bearing of this example is a cross roller bearing. The bearing 1 has an outer ring 2 and an inner ring 3 as race rings, and has a structure in which a plurality of rollers 4 as rolling elements are rotatably mounted between them. On the inner peripheral surface of the outer ring 2, a pair of orthogonal raceway surfaces 2a, 2b forming a V-shaped groove cross section are formed. A pair of raceway surfaces 3a, 3b which are also orthogonal to each other are also formed on the outer peripheral surface of the inner ring 3, and these raceway surfaces 2a, 2b, 3a, 3b define a raceway of rectangular cross section and are formed therein A plurality of roller groups 4 are rotatably mounted. Roller group 4
Has a first roller 4a and a second roller 4b, and the first roller group is arranged such that the rotation axis is parallel to the raceway surfaces 2b and 3a, whereby the raceway surface 2a, 3b, the other second roller group is arranged orthogonal to the first roller 4a, and the raceway surfaces are 2b and 3a. These first and second rollers are They are arranged alternately in the circumferential direction.

Here, the outer ring 2 has a structure in which it is divided into first and second outer ring portions 21 and 22 which are symmetrical to each other in a plane perpendicular to the central axis 1a, and the first outer ring portion 21 has a raceway surface 2a. And the other second outer ring portion 22 has a raceway surface 2b. In the first outer ring portion 21, four knock pins 5a to 5d (in the figure, only three pins 5a, 5b, 5d are shown at equal angular intervals in the circumferential direction, in this example, 90 degree intervals). ) Has been planted. More specifically, each knock pin is fixed in a state of penetrating the first outer ring portion 21, and the halves on the tip end side thereof vertically project from the annular mating surface 21a with the second outer ring portion. On the other hand, on the annular mating surface 22a of the second outer ring portion 22 with the first outer ring portion, pin through holes 6a into which knock pins can be fitted are inserted at positions corresponding to these four knock pins 5a to 5d. ~ 6d (holes 6a, 6b, 6d in the figure)
Only shown) are formed.

In the bearing 1 having this structure, after the first outer ring portion 21 is assembled to the outer circumference of the inner ring 3, the roller group 4 is mounted, and then the second outer ring portion 22 is replaced with the first outer ring portion 21.
Assembled to. In this assembling work, the second outer ring portion is provided with the second through holes 6a to 6d so that the knock pins 5a to 5d on the side of the first outer ring portion 21 are fitted into the second through holes 6a to 6d.
The outer ring portion 22 may be positioned and the second outer ring portion may be attached to the first outer ring portion 21 side. Unlike the conventional case, the first and second outer ring parts thus assembled are fastened to each other in a substantially error-free state, that is, in a state where there is no misalignment. In addition, such an assembling work can be performed more easily than in the past.

Although the example described above is a case where the outer ring side has a divided structure, the present invention can be similarly applied to a case where the inner ring side has a divided structure. Further, the present invention can be applied to a case where both the outer ring and the inner ring have a split structure, and in this case, knock pins may be attached to both the outer ring and the inner ring. Further, the number of knock pins may be two or more, and is not limited to four in the above example. Furthermore, in the above example, the knock pin is attached to the side of the first outer ring portion, but instead of this, it is attached to the side of the second outer ring portion and a pin hole may be formed in the first outer ring portion. Good. Alternatively, it goes without saying that knock pins may be attached to both sides of the first and second outer ring portions and pin holes may be formed on the sides of the first and second outer ring portions corresponding to these knock pins. is there.

[Effect of device]

As described above, according to the present invention, in the bearing having the structure in which the bearing ring is divided into two parts on the plane perpendicular to the center line, the bearing pins having the split structure are assembled to each other by using the knock pin. Therefore, according to the present invention, unlike the prior art, it is possible to assemble the split raceway in a state in which there is substantially no misalignment with a simple operation.

[Brief description of drawings]

1 is a sectional view showing the upper half of a cross roller bearing according to an embodiment of the present invention, and FIG. 2 is a view of the bearing shown in FIG. 1 as seen from the direction of arrow II. [Explanation of symbols] 1 ... Cross roller bearing 2 ... Outer ring 2a, 2b, 3a, 3b ... Raceway surface 21 ... First outer ring portion 21a, 22a ... Mating surface 22 ... Second outer ring portion 3 …… Inner ring 4, 4a, 4b …… Rollers 5a to 5d …… Knock pins 6a to 6d …… Pin holes.

Claims (1)

(57) [Scope of utility model registration request] 1. A bearing having a structure in which a bearing ring is divided into a first bearing ring and a second bearing ring in a plane perpendicular to the central axis, wherein the first bearing ring is connected to the second bearing ring. At least two knock pins are planted on the mating surface, and the knock pins on the mating surface of the second bearing ring with the first bearing ring are located at positions corresponding to the respective knock pins. A bearing having a split race ring, in which a pin hole into which is inserted is formed.