JP4363502B2 - Cross roller bearing - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cross roller bearing, and more particularly to a mechanism for inserting a roller into a track between an outer ring and an inner ring.
[0002]
[Prior art]
As the cross roller bearing, one in which each of the inner ring and the outer ring is integrated is known. In the cross roller bearing of this structure, in order to insert a roller into an annular track formed between the inner ring and the outer ring, a roller insertion hole extending in the radial direction from the outer peripheral surface of the outer ring to the track is generally formed. In addition, a method is adopted in which the roller is inserted into the track through this, and then the roller insertion hole is plugged to enclose the roller in the track. In order to prevent the stopper from being removed from the roller insertion hole, the pin is driven from the annular end surface side of the outer ring so as to penetrate the stopper inserted into the roller insertion hole.
[0003]
A cross roller bearing having a structure in which a roller is sealed in this manner is disclosed in, for example, Japanese Patent Application Laid-Open No. 8-93757.
[0004]
[Problems to be solved by the invention]
An object of the present invention is to improve a roller insertion mechanism composed of a roller insertion hole and a plug in a cross roller bearing in which a roller is inserted into a track from a roller insertion hole and then the roller insertion hole is sealed with a plug. Thus, it is possible to easily process, assemble, and control the accuracy of the cross roller bearing.
[0005]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention includes an outer ring, an inner ring, an annular raceway having a rectangular cross section formed between them, and a plurality of rollers attached to the raceway. A cross roller bearing having a roller insertion hole having a size capable of inserting the roller into the track in a state where the outer ring and the inner ring are assembled concentrically, a plug sealing the roller insertion hole, and the plug And a fastening bolt fastened so as not to be removed from the roller insertion hole.
[0006]
In addition, the roller insertion hole region circumferential surface the outer ring from the edge of the outer ring circumferential surface is cut to a shape which narrowed arcuately in the annular end face of the outer ring, and wherein horizontal the inner peripheral surface side from the edge of the inner ring outer peripheral surface of the annular end face of the inner ring is the direction along at least hand or et bearing central axis of the region taken as a shape narrowed arcuately A gap extending between the defect portion due to the roller insertion hole in the raceway surface of the track and the end surface of the plug that seals the defect portion , the depth reaching the raceway. When the roller rolls, it is a hole extending so as to intersect with the direction in which the raceway surface and the roller are in line contact , and a screw hole into which the fastening bolt can be screwed is formed on the bottom surface of the roller insertion hole. It is characterized by being To have.
[0007]
Furthermore, the plug, the is against roller insertion hole from the side of the annular end face attached to said transverse direction and has a size and shape fitted to the roller insertion hole, one of the plug is prescribed portion of said annular end face by an end face, its the other end surface are formed a part of the raceway surface of the raceway, to the plug, said defining a portion of said annular end face from one end face, extends the lateral direction, in a state of penetrating to the end face of the other part of the track surface is formed, it is characterized in that the bolt holes of the fastening bolt is formed.
[0008]
In the cross roller bearing of the present invention configured as described above, the roller insertion hole is formed in the annular end surface of the outer ring or the inner ring, and a stopper is fitted into the roller insertion hole in the same direction as the roller insertion hole. Later, it is only necessary to attach the fastening bolt in the same direction as the roller insertion hole and fasten and fix the stopper. In this fastening and fixing work, the fastening bolt can be attached in a state where the bolt hole opened in the stopper can be directly visually observed.
[0009]
Therefore, the stopper is fixed to the roller insertion hole by driving the pin into the stopper inserted into the roller insertion hole from the direction perpendicular to the stopper in a state where it cannot be directly seen, as compared to the case where the stopper is fixed. Can be done very easily.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
A cross roller bearing which is an embodiment to which the present invention is applied will be described below with reference to the drawings.
[0011]
1A to 1C are a vertical cross-sectional view, a partial side surface, and an external perspective view of a stopper of a cross roller bearing of this embodiment. Referring to these drawings, the cross roller bearing 1 of this example includes an integral annular outer ring 2, an integral annular inner ring 3, and a rectangular cross section formed therebetween. And a plurality of cylindrical rollers 5 attached to the track 4.
[0012]
The track 4 is defined by a pair of left and right track surfaces 4a and 4b on the outer ring side and a pair of left and right track surfaces 4c and 4d on the inner ring side. On this track 4, cylindrical rollers having substantially the same outer diameter and height are arranged in the circumferential direction with their central axes alternately perpendicular to each other.
[0013]
A roller insertion hole 21 is formed in the outer ring 2, and the roller insertion hole 21 is sealed with a stopper 22. The stopper 22 is fastened and fixed to the outer ring 2 by fastening bolts 23 (hexagon bolts) so as not to be removed from the roller insertion hole 21.
[0014]
The roller insertion hole 21 is a hole having a depth from one annular end surface 2 a of the outer ring 2 to the track 4. The roller insertion hole 21 has a shape that is cut into a substantially semicircular shape from the inner peripheral surface 2b side of the outer ring 2, and extends to a position where the raceway surface 4b and the raceway surface 4a intersect with the same cross-sectional shape. ing. Therefore, the roller 5 can be inserted into the track 4 through the roller insertion hole 21.
[0015]
The stopper 22 that seals the roller insertion hole 21 has the same contour shape as the roller insertion hole 21, and just fits into the roller insertion hole 21. Further, as can be seen from FIG. 1A, the outer end surface 22a of the plug 22 fitted into the roller insertion hole 21 defines a defective portion of the annular end surface 2a of the outer ring 2 that has been lost due to the formation of the roller insertion hole 21. It becomes the end face to do.
[0016]
On the other hand, as can be seen from FIG. 1 (C), on the other inner end surface 22b of the plug 22, the outer peripheral portion 221 is a substantially semicircular plane that is in close contact with the bottom surface 21a of the roller insertion hole 21, The inner peripheral portion 222 is a raceway surface that defines a part of the raceway surface 4 b that is missing due to the formation of the roller insertion hole 21.
[0017]
Next, the plug 22 is formed with a bolt hole 22c penetrating from the outer end surface 22a to the semicircular plane 221 of the inner end surface 22b, and the bolt hole 22c has a portion on the side of the outer end surface 22a. The counterbore part in which the head of the fastening bolt 23 is embedded is formed. Further, a screw hole 21c for a fastening bolt is formed in a portion of the bottom surface 21a of the roller insertion hole 21 facing the bolt hole 22c.
[0018]
A procedure for assembling the cross roller bearing 1 having this configuration will be described. First, the roller insertion hole 21 of the outer ring 2 is sealed with a stopper 22 and the fastening bolt 23 is tightened. In this state, a finishing process (polishing) is performed on the pair of raceway surfaces 4a and 4b formed on the inner peripheral surface of the outer ring 2. Similarly, finishing is performed on the raceway surfaces 4c and 4d formed on the outer circumferential surface of the inner ring 3.
[0019]
Thereafter, the fastening bolts 23 are removed, the plugs 22 are removed from the roller insertion holes 21, and then the rollers 5 are inserted into the track 4 one by one from the roller insertion holes 21 with the outer ring 2 and the inner ring 3 assembled. Perform the roller insertion work. After the roller insertion operation is finished, the stopper 22 is inserted into the roller insertion hole 21 and the stopper 22 is fastened and fixed to the outer ring 2 side by the fastening bolt 23.
[0020]
In the cross roller bearing 1 of this example, a roller insertion hole 21 is formed in the annular end surface 2a of the outer ring 2, and a stopper 22 is fitted into the roller insertion hole 21 in the same direction as the roller insertion hole. Similarly, the fastening bolt 23 may be mounted in the same direction as the roller insertion hole 21 and the stopper 22 may be fastened and fixed. In this fastening and fixing work, the fastening bolt 23 can be attached in a state where the bolt hole 22c opened in the plug 22 can be directly visually observed.
[0021]
Therefore, the stopper is fixed to the roller insertion hole by driving the pin into the stopper inserted into the roller insertion hole from the direction perpendicular to the stopper in a state where it cannot be directly seen, as compared to the case where the stopper is fixed. Can be done very easily.
[0022]
(Other embodiments)
Next, FIG. 2 shows a cross roller bearing in which a roller insertion hole is formed in the inner ring. In this case, a stopper 32 is attached to the roller insertion hole 31 formed in the inner ring 3, and the stopper 32 is fastened and fixed to the inner ring 3 side by a fastening bolt 33. The structure and shape of each part are the same as the example described with reference to FIG. Also in this case, the same effect as the above embodiment can be obtained.
[0023]
Of course, it is also possible to form roller insertion holes in both the outer ring and the inner ring.
[0024]
Next, FIGS. 3A and 3B show a modification of the roller insertion hole 21 and the plug 22 shown in FIG. The stopper 22A of this example has a shape in which the outer ring inner peripheral surface 2b side is narrowed in an arc shape, and the roller insertion hole 21A also has a circular arc shape on the outer ring inner peripheral surface 2b side correspondingly. It has a narrow shape. Since shapes and structures other than this are the same as those in the case of FIG. 1, corresponding portions are denoted by the same reference numerals, and description thereof is omitted. In FIG. 3A, the bolt hole 22c and the screw hole 21c of the fastening bolt 23 are omitted.
[0025]
When the roller insertion hole 21A having this shape is used, the gaps A and B formed at the boundary between the raceway surface portion 223 defined by the plug 22A and the raceway surface 4b on the outer ring side are inclined with respect to the axis of the roller 5. It becomes a state. The roller 5 and the raceway surface 4b are in a line contact state parallel to the roller axis, and if the line contact position coincides with the gaps A and B, smooth rolling of the roller 5 may be hindered. However, in this example, since the gaps A and B of the plug 22A intersect with the direction of line contact between the roller and the raceway surface 4b, smooth rolling of the roller 5 is inhibited by these gaps. There is an advantage of not being done.
[0026]
【The invention's effect】
As described above, according to the cross roller bearing of the present invention, the roller insertion hole is opened laterally from the annular end surface of the outer ring or the inner ring, and a stopper is attached from the same direction and fastened from the same direction. Bolts are attached and the stopper is fastened and fixed to the outer ring or the inner ring. Therefore, it is possible to obtain an effect that the attaching operation of the plug for sealing the roller insertion hole becomes extremely simple and the accuracy of the raceway surface and the like can be easily managed.
[0027]
Moreover, according to the cross roller bearing of this invention, there exists an advantage that the countermeasure with respect to the oil leakage at the time of incorporating in an apparatus becomes easy. That is, unlike the conventional case where the roller insertion hole is opened on the outer peripheral surface of the outer ring, the roller insertion hole is opened on one end surface of the outer ring or the inner ring. Therefore, since a seal mechanism for preventing oil leakage may be disposed on the flat end surface, the seal mechanism can be easily configured.
[Brief description of the drawings]
FIG. 1 is a view showing a cross roller bearing to which the present invention is applied, in which (A) is a longitudinal sectional view thereof, (B) is a partial end view thereof, and (C) is an external perspective view of a stopper.
FIG. 2 is a longitudinal sectional view showing another example of a cross roller bearing to which the present invention is applied.
3A and 3B are explanatory views for showing a modified example of a roller insertion hole and a stopper in the cross roller bearing of FIG. 1, wherein FIG. 3A is an explanatory view showing a portion of an outer ring to which the stopper is attached, and FIG. It is a fragmentary end view which shows the part with which was mounted | worn.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cross roller bearing 2 Outer ring 2a Ring end surface 3 of outer ring Inner ring 3a Ring end surface 4 of inner ring Track 4a, 4b, 4c, 4d Track surface 5 Roller 21, 31 Roller insertion hole 21a Roller insertion hole bottom 21c Roller insertion hole Screw holes 22 and 32 having a bottom surface 22a Plug 22a Outer end surface 22b Plug inner end surface 22c Bolt hole 23 and 33 opened in the plug Fastening bolt 21A Roller insertion hole 22A Plug 223 Part A of the raceway surface defined by the plug, B Clearance on the raceway surface

Claims (1)

In a cross roller bearing having an outer ring, an inner ring, an annular raceway having a rectangular cross section formed therebetween, and a plurality of rollers mounted on the raceway,
A roller insertion hole of a size capable of inserting the roller into the track in a state where the outer ring and the inner ring are assembled concentrically ;
A stopper sealing the roller insertion hole;
It has a fastening bolt that fastens this stopper so as not to be removed from the roller insertion hole,
The roller insertion hole includes a region cut out from an edge on the outer ring inner peripheral surface side of the annular end surface of the outer ring so that the inner peripheral surface side of the outer ring is narrowed in an arc shape, and an annular end surface of the inner ring extending transversely to a direction along at least hand or et bearing central axis of the region where the inner peripheral surface side from the edge of the inner ring outer peripheral surface is cut to a shape which narrowed arcuately in and And a depth between the track and the end surface of the stopper that seals the defect portion on the raceway surface of the raceway, and the roller rolls on the raceway surface. A hole extending across the direction in which the raceway surface and the roller are in line contact with each other ,
A screw hole into which the fastening bolt can be screwed is formed on the bottom surface of the roller insertion hole,
The stopper is mounted in the lateral direction from the annular end surface side with respect to the roller insertion hole, and has a size and shape that fits into the roller insertion hole,
A part of the annular end surface is defined by one end surface of the stopper, and a part of the track surface of the track is formed on the other end surface,
The plug extends from the one end surface defining a part of the annular end surface in the lateral direction and penetrates the other end surface where the part of the raceway surface is formed. A cross roller bearing in which a bolt hole of a fastening bolt is formed.

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