KR102223160B1 - Crossed roller bearing - Google Patents

Abstract

The cross roller bearing has an outer ring portion having a ring shape, a ring shape concentric with the outer ring, an inner ring portion disposed inside the outer ring, a plurality of rollers disposed in a space between the outer ring portion and the inner ring portion, and And a retainer disposed between the rollers. The inner ring portion is formed on an inner surface, and has a lubrication hole formed such that a central axis is inclined with respect to the inner surface of the inner ring portion.

Description

Crossed roller bearing {CROSSED ROLLER BEARING}

The present invention relates to a cross roller bearing, and more particularly, to a cross roller bearing capable of automatically supplying lubricating oil between rollers.

In general, a crossed roller bearing has a simple structure, but a single bearing can simultaneously receive loads in all directions such as axial load, radial load, and moment load. It is known to be. The cross roller bearing has a retainer as a means for aligning each roller to maintain a predetermined distance.

These cross roller bearings are characterized by fixing the axis of the rotating machine at a desired position, supporting the self-weight of the axis and the load applied to the axis, and rotating the axis, and a single bearing supports all loads in multiple exit directions. do.

These cross roller bearings are largely divided into an inner and outer ring integrated type, and an inner and outer ring divided type. In the integrated inner and outer rings, the inner and outer rings rotate in both directions to transmit stable rotational force and torque, and are mainly used for shaft parts such as robot arms. The inner and outer ring split type is used in a portion requiring the rotational force of the inner ring and has a disadvantage that it is difficult to obtain a large rotational force.

The cross roller bearing needs continuous supply of lubricating oil due to problems of oxidation and deterioration of lubricating oil. If the lubricant is not supplied, the robot arm is struck, and accordingly, a problem of damage to the transported object occurs.

Accordingly, the technical problem of the present invention is conceived in this respect, and an object of the present invention is to provide a cross roller bearing capable of preventing deterioration of function by continuously supplying lubricating oil.

A cross roller bearing according to an embodiment for realizing the object of the present invention has an outer ring portion having a ring shape, a ring shape concentric with the outer ring, and an inner ring portion disposed inside the outer ring, and the outer ring portion And a plurality of rollers disposed in a space between the inner ring portion and a retainer disposed between the rollers. The inner ring portion is formed on an inner surface, and has a lubrication hole formed such that a central axis is inclined with respect to the inner surface of the inner ring portion.

In one embodiment of the present invention, the oil supply hole may be formed to be spaced apart from each other at 120 degree intervals on the inner surface of the inner ring part.

In one embodiment of the present invention, the oil supply hole may be two injection holes into which lubricant is injected and one discharge hole through which the lubricant is discharged.

In one embodiment of the present invention, the oil supply hole may be formed to be spaced apart from each other at 90 degree intervals on the inner surface of the inner ring part.

In an embodiment of the present invention, the oil supply hole may be three injection holes into which lubricant is injected and one discharge hole through which the lubricant is discharged.

In one embodiment of the present invention, an angle formed by a central axis between the inner surface of the inner ring portion and the oil supply hole may be 40 degrees or more and 50 degrees or less.

In one embodiment of the present invention, the cross roller bearing may further include an automatic lubrication device connected to the lubrication hole to inject lubricating oil into the space between the outer ring and the inner ring.

In an embodiment of the present invention, the automatic oil supply device includes a body portion, a first connection portion coupled to the body portion, and a second connection portion coupled to the first connection portion and discharges lubricating oil supplied from the body portion. can do.

In an embodiment of the present invention, the body portion is a lubricant oil storage portion in which the lubricant is stored, a lubricant oil support portion that supports the stored lubricant, a pressure holding portion providing pressure to the lubricant stored in the lubricant storage portion, and the pressure holding portion. It may include a supporting pressure support.

In one embodiment of the present invention, the first connection part may include a first connection body connected to the body part and a first connection part protruding from the first connection part body and having a male thread shape.

In one embodiment of the present invention, the second connection part is fastened to the first fastening part, and includes a second connection body having a female thread shape therein and a discharge port protruding from the second connection part body, and having a stepped part. I can.

In one embodiment of the present invention, the automatic oil supply device may supply lubricant by using a space between the outer ring portion and the inner ring portion and a pressure difference between the automatic oil supply device.

In one embodiment of the present invention, the retainer may include a retainer body plate having a rectangular outline.

In one embodiment of the present invention, the retainer body plate may include rectangular side surfaces that contact rollers adjacent to both sides thereof.

In one embodiment of the present invention, the rectangular side surface may be a mirror plane facing the center of the cross roller bearing by inclining in a direction approaching each other from one edge toward the other edge along one diagonal direction on the surface. .

In one embodiment of the present invention, each of the rectangular side surfaces may have a concave portion for accumulating lubricant oil having a predetermined depth in a central portion thereof.

In one embodiment of the present invention, the concave portion may be formed in communication with each other on the bottom surface through the retainer body plate.

In one embodiment of the present invention, the roller may be formed in a cylindrical shape.

In one embodiment of the present invention, 70 rollers and 70 retainers may be disposed respectively.

In one embodiment of the present invention, the amount of lubricating oil injected into the space between the outer ring portion and the inner ring portion may be 12 cc or more and 13 cc or less.

According to embodiments of the present invention, an automatic oil supply device is connected to a cross roller bearing. Therefore, it is possible to automatically supply the lubricating oil into the cross roller bearing.

In addition, since it includes a discharge hole through which waste lubricant can be discharged, the waste lubricant is smoothly discharged, so that the lubricant can be circulated inside the cross roller bearing. Therefore, it is possible to reduce the defects of the cross roller bearing.

In addition, it is possible to reduce the robot vibration caused by the failure of the cross roller bearing, and since it is possible to solve the problem of insufficient oil supply, which is the main cause of the failure of the cross roller bearing, the life of the cross roller bearing can be extended.

1 is a perspective view showing a robot including a cross roller bearing according to an embodiment of the present invention.
2 is a side view showing the robot arm of FIG. 1.
3 is a plan view showing a cross roller bearing according to an embodiment of the present invention.
4 is a cross-sectional view taken along line II′ of FIG. 3.
5 is a plan view showing a state in which a connection part is coupled to an oil supply hole formed in an inner ring part of a cross roller bearing according to an embodiment of the present invention.
6 is a plan view showing an oil supply hole formed in an inner ring portion of a cross roller bearing according to an embodiment of the present invention.
7 is a plan view showing a state in which an automatic oil supply device is coupled to a cross roller bearing according to an embodiment of the present invention.
8 is a plan view illustrating a first connection part of the automatic oil supply device of FIG. 7.
9 is a plan view illustrating a second connection part of the automatic oil supply device of FIG. 7.
10 is a plan view showing a body portion of the automatic oil supply device of FIG. 7.
11 is a plan view showing a cross roller bearing according to an embodiment of the present invention.
12 is a partially cut-away plan view of a cross roller bearing according to an embodiment of the present invention.
13 is a plan view showing a retainer of a cross roller bearing according to an embodiment of the present invention.
14 is a cross-sectional view showing a retainer of a cross roller bearing according to an embodiment of the present invention.
15 is a side view showing a cross roller bearing according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the drawings.

1 is a perspective view showing a robot including a cross roller bearing according to an embodiment of the present invention. FIG. 2 is a side view showing the robot arm of FIG. 1.

1 and 2, a robot using a cross roller bearing according to an embodiment of the present invention is shown.

The robot may include a first lifting part E1, a second lifting part E2, a first robot arm A1, and a second robot arm A2.

The first lifting part E1 may be fixed to the floor, and may have a structure capable of rotating through a rotation shaft R. The second lifting part E1 is connected to the first lifting part E1. The second lifting part E1 can be operated vertically by the lifting shaft.

The first robot arm A1 and the second robot arm A2 may be connected to the second lifting part E2. The first robot arm A1 and the second robot arm A2 serve to move an object that needs to be moved.

The first robot arm (A1) and the second robot arm (A2) are on a first support part (S1), a second support part (S2) disposed on the first support part (S1), and the second support part (S2). It may include a third support (S3) disposed and a fourth support (S4) disposed on the third support (S3).

A first cross roller bearing CRB1 may be disposed at a connection portion connecting the first support portion S1 and the second support portion S2. A second cross roller bearing CRB2 may be disposed at a connection part connecting the second support part S2 and the third support part S3. A third cross roller bearing CRB3 may be disposed at a connection portion connecting the third support portion S3 and the fourth support portion S4. In addition, a cross roller bearing may be used because rotation is also required at a connection part connecting the first lifting part E1 and the floor. As such, the cross roller bearing needs to support a large load and can be used in a portion where rotation is required.

Here, a robot has been described as an example to describe the field in which the cross roller bearing according to the embodiment of the present invention is used, but the cross roller bearing according to the embodiment of the present invention is not used only in the robot, and requires rotation. It can be used on all areas.

3 is a plan view showing a cross roller bearing according to an embodiment of the present invention. 4 is a cross-sectional view taken along line II′ of FIG. 3.

3 and 4, the cross roller bearing 100 according to an exemplary embodiment of the present invention includes an outer ring part 110, an inner ring part 120, a first oil supply hole 131, and a second oil supply hole 132. And a third oil supply hole 133.

The outer ring portion 110 has a ring shape. The inner ring part 120 has a ring shape concentric with the outer ring part 110. The inner ring portion 120 has a size smaller than that of the outer ring portion 110 and is disposed inside the outer ring portion 110.

A plurality of rollers and a plurality of retainers are disposed in the space between the outer ring part 110 and the inner ring part 120. The retainer may be disposed between the rollers. The rollers and retainers will be described in detail with reference to FIGS. 12 to 15.

The first oil supply hole 131, the second oil supply hole 132, and the third oil supply hole 133 are formed on the inner surface of the inner ring part 120.

The first oil supply hole 131, the second oil supply hole 132, and the third oil supply hole 133 may be formed to be spaced apart at intervals of 120 degrees, respectively. For example, a cross roller bearing according to an embodiment of the present invention may include three oil supply holes. The first oil supply hole 131, the second oil supply hole 132, and the third oil supply hole 133 have a first oil supply connection part 121, a second oil supply connection part 122, and a third oil supply connection part 123, respectively. Can be combined.

Two of the first oil supply hole 131, the second oil supply hole 132, and the third oil supply hole 133 may be injection holes into which lubricant is injected. In addition, the other oil supply hole may be a discharge hole through which the lubricant is discharged. The positions of the two injection holes and one discharge hole are not specified and may be arbitrarily arranged.

When the cross roller bearing according to an embodiment of the present invention is used in a robot, it may be designed based on rotation of about 170 degrees. Therefore, the angle that one injection hole can cover is about 170 degrees. Therefore, considering the rotation in both directions, a maximum rotation of 340 degrees can be covered with one injection hole. In addition, in this embodiment, since two injection holes are formed, all regions can be covered.

Waste lubricant can be discharged through one discharge hole. Since waste lubricant may be discharged through the discharge hole, it may be possible to circulate the lubricant within the cross roller bearing.

A ring-shaped track 115 is formed between the outer ring part 110 and the outer ring part 120. A plurality of rollers and a plurality of retainers may be disposed in the track. A plurality of oil supply holes 130 are formed on the inner surface of the inner ring part 120.

An angle between the central axis of the oil supply hole 130 and the inner surface of the inner ring 120 may be 40 degrees or more and 50 degrees or less. Preferably, the central axis of the oil supply hole 130 and the inner surface of the inner ring 120 may be formed to form a 45 degree angle.

5 is a plan view showing a state in which a connection part is coupled to an oil supply hole formed in an inner ring portion of a cross roller bearing according to an embodiment of the present invention. 6 is a plan view showing an oil supply hole formed in an inner ring portion of a cross roller bearing according to an embodiment of the present invention.

Referring to FIG. 5, a state in which the first oil supply connection part 121 is coupled to the first oil supply hole 131 formed on the inner surface of the inner ring part 120 is shown.

An angle between the central axis of the oil supply hole 130 and the inner surface of the inner ring 120 may be 40 degrees or more and 50 degrees or less. Preferably, the central axis of the oil supply hole 130 and the inner surface of the inner ring 120 may be formed to form a 45 degree angle.

In addition, since the first oil supply connection part 121 is coupled to correspond to the first oil supply hole 131, the angle formed by the central axis of the first oil supply connection part 121 and the inner surface of the inner ring part 120 is 40 It may be greater than or equal to 50 degrees. Preferably, the central axis of the first oil supply connection part 121 and the inner surface of the inner ring part 120 may be formed to form a 45 degree angle.

6, a lubrication hole formed in an inner ring portion of a cross roller bearing according to an embodiment of the present invention is shown.

An angle between the central axis of the oil supply hole 130 and the inner surface of the inner ring 120 may be 40 degrees or more and 50 degrees or less. Preferably, the central axis of the oil supply hole 130 and the inner surface of the inner ring 120 may be formed to form a 45 degree angle.

7 is a plan view showing a state in which an automatic oil supply device is coupled to a cross roller bearing according to an embodiment of the present invention.

Referring to FIG. 7, a state in which an automatic oil supply device is coupled to a cross roller bearing according to an embodiment of the present invention is shown.

The cross roller bearing 100 according to an embodiment of the present invention includes an outer ring part 110, an inner ring part 120, a first oil supply hole 131, and a first oil supply connection part 121. An automatic oil supply device 200 may be coupled to the cross roller bearing 100.

The automatic refueling device 200 is coupled to the cross roller bearing 100 through a refueling hose 300.

The automatic refueling device 200 may include a first connection part 210, a second connection part 220, and a body part 230. The first connection part 210 is coupled to the body part 230, and the second connection part 220 is coupled to the first connection part 210. The second connection part 220 transfers the lubricating oil provided from the body part through the oil supply hose 300 to the first oil supply connection part 121.

The automatic oil supply device 200 supplies lubricant to the ring-shaped track 115 between the outer ring portion 110 and the outer ring portion 120. The automatic oil supply device 200 may automatically supply lubricating oil using a pressure difference. That is, the lubricating oil is automatically supplied between the inner pressure of the automatic oil supply device 200 and the pressure difference between the outer ring portion 110 and the outer ring portion 120 inside the ring-shaped track 115. The amount of lubricating oil injected into the space between the outer ring portion and the inner ring portion may be 12 cc or more and 13 cc or less. Preferably, the amount of the lubricant may be 12.965757cc.

For example, when the pressure inside the ring-shaped track 115 between the outer ring portion 110 and the outer ring portion 120 is lower than the pressure inside the automatic oil supply device 200, lubricant is automatically supplied. When the pressure inside the automatic oil supply device 200 and the pressure inside the ring-shaped track 115 between the outer ring portion 110 and the outer ring portion 120 are the same, lubricant is not supplied.

8 is a plan view illustrating a first connection part of the automatic oil supply device of FIG. 7. 9 is a plan view illustrating a second connection part of the automatic oil supply device of FIG. 7. 10 is a plan view showing the body of the automatic oil supply device of FIG.

Referring to FIG. 8, a first connection part 210 of an automatic refueling device according to an embodiment of the present invention is shown.

The first connection part 210 includes a first connection body 211 and a first fastening part 213 coupled to the body part 230. The first connection body 211 is connected to the body part 230, and the first fastening part 213 is connected to the second connection part 220. The first connection body 211 may be formed of a metal material.

The first fastening part 213 has a width smaller than that of the first connection body 211 and has a shape protruding from the first connection body 211. The outer surface of the first fastening part 213 may have a male thread shape. The first fastening part 213 may be formed of a metal material.

Referring to FIG. 9, a second connector 220 of the automatic refueling device according to an embodiment of the present invention is shown.

The second connection part 220 may include a second connection body 221 and an outlet 223. The second connection body 221 is fastened with the first fastening part 213. The second connection body 221 may have a female screw shape formed therein. The second connection body 221 may have a shape corresponding to a shape of a male screw formed outside of the first fastening part 213 in a shape of a female screw formed therein. The second connection body 221 may be formed of a metal material.

The outlet 223 may have a shape protruding from the second connection body 221. The outlet 223 may include a stepped portion 225. The outlet 223 may be formed of a relatively flexible material. For example, the outlet 223 may be formed of a rubber material.

Referring to FIG. 10, a body portion 230 of an automatic refueling device according to an embodiment of the present invention is shown.

The body part 230 includes a lubricant storage part 231, a lubricant support part 232, a pressure maintenance part 233, and a pressure support part 234.

Lubricating oil may be stored in the lubricating oil storage unit 231. The lubricating oil stored in the lubricating oil storage unit 231 is connected to the outer ring part 110 through the first connection part 210 and the second connection part 220. Lubricating oil is supplied to the ring-shaped raceway 115 between the outer ring parts 120.

The automatic oil supply device 200 supplies lubricant to the ring-shaped track 115 between the outer ring portion 110 and the outer ring portion 120. The automatic oil supply device 200 may automatically supply lubricating oil using a pressure difference. That is, the lubricating oil is automatically supplied between the inner pressure of the automatic oil supply device 200 and the pressure difference between the outer ring portion 110 and the outer ring portion 120 inside the ring-shaped track 115.

For example, when the pressure inside the ring-shaped track 115 between the outer ring portion 110 and the outer ring portion 120 is lower than the pressure inside the automatic oil supply device 200, lubricant is automatically supplied. When the pressure inside the automatic oil supply device 200 and the pressure inside the ring-shaped track 115 between the outer ring portion 110 and the outer ring portion 120 are the same, lubricant is not supplied.

The lubricating oil support part 232 serves to support the lubricating oil stored in the lubricating oil storage part 231 from leaking downward. In addition, the lubricating oil support part 232 serves to support the lubricating oil stored in the lubricating oil storage part 231 with a constant pressure.

The pressure maintaining part 233 serves to support the lubricating oil support part 232 with a constant pressure. The pressure holding part 233 may include an object having elasticity. For example, the pressure holding part 233 may include a spring. The pressure maintaining part 233 may be composed of two springs extending in a vertical direction with respect to the lubricant support part 232. The pressure support part 234 serves to support the pressure holding part 233.

The body portion 230 may be formed of a transparent material. For example, the body portion 230 may be formed of a transparent plastic material. Therefore, it is possible to easily check the amount of the lubricant remaining in the lubricant.

11 is a plan view showing a cross roller bearing according to an embodiment of the present invention.

Referring to FIG. 11, the cross roller bearing 1100 according to an exemplary embodiment of the present invention includes an outer ring part 1110, an inner ring part 1120, a first oil supply hole 1131, a second oil supply hole 1132, and a third. It includes an oil supply hole 1133 and a fourth oil supply hole 1134.

The outer ring portion 1110 has a ring shape. The inner ring portion 1120 has a ring shape concentric with the outer ring portion 1110. The inner ring portion 1120 has a size smaller than that of the outer ring portion 1110 and is disposed inside the outer ring portion 1110.

A plurality of rollers and a plurality of retainers are disposed in the space between the outer ring portion 1110 and the inner ring portion 1120. The retainer may be disposed between the rollers. The rollers and retainers will be described in detail with reference to FIGS. 12 to 15.

The first oil supply hole 1131, the second oil supply hole 1132, a third oil supply hole 1133, and a fourth oil supply hole 1134 are formed on the inner surface of the inner ring part 1120.

The first oil supply hole 1131, the second oil supply hole 1132, the third oil supply hole 1133, and the fourth oil supply hole 1134 may be formed at intervals of 90 degrees. For example, a cross roller bearing according to an embodiment of the present invention may include four oil supply holes. The first oil supply hole 1131, the second oil supply hole 1132, the third oil supply hole 1133, and the fourth oil supply hole 1134 have a first oil supply connection part 1121 and a second oil supply connection part 1122, respectively. The oil supply connection part 1123 and the fourth oil supply connection part 1124 may be coupled.

Three of the first oil supply hole 1131, the second oil supply hole 1132, the third oil supply hole 1133, and the fourth oil supply hole 1134 may be injection holes into which lubricant is injected. In addition, the other oil supply hole may be a discharge hole through which the lubricant is discharged. The positions of the three injection holes and one discharge hole are not specified and may be arbitrarily arranged.

When the cross roller bearing according to an embodiment of the present invention is used in a robot, it may be designed based on rotation of about 170 degrees. Therefore, the angle that one injection hole can cover is about 170 degrees. Therefore, considering the rotation in both directions, a maximum rotation of 340 degrees can be covered with one injection hole. In addition, in this embodiment, since three injection holes are formed, all areas can be covered.

Waste lubricant can be discharged through one discharge hole. Since waste lubricant may be discharged through the discharge hole, it may be possible to circulate the lubricant within the cross roller bearing.

12 is a partially cut-away plan view of a cross roller bearing according to an embodiment of the present invention. 13 is a plan view showing a retainer of a cross roller bearing according to an embodiment of the present invention. 14 is a cross-sectional view showing a retainer of a cross roller bearing according to an embodiment of the present invention. 15 is a side view showing a cross roller bearing according to an embodiment of the present invention.

12 to 15, the cross roller bearing 100 according to an embodiment of the present invention includes an outer ring portion 110, an inner ring portion 120, and between the outer ring portion 110 and the inner ring portion 120. It includes a plurality of cylindrical rollers 2 inserted into the ring-shaped track 115 of a rectangular cross section formed in, and a plurality of retainers 3 for holding adjacent rollers 2 at regular intervals, respectively. Each of the rollers 2 and the retainer 3 may be disposed at a time of 70.

The retainer 3 inserted between the adjacent rollers 2 will be described. The retainer 3 includes a retainer body plate 11 formed of a plastic material, a metal material, a sintered material, or the like. The retainer body plate 11 is a plate having a rectangular outline corresponding to the rectangular cross-sectional shape 4a of the track 115, as shown by an imaginary line in FIG. 13.

Next, in the central portion of the rectangular side surfaces 12 and 13, concave portions 16 and 17 for storing lubricant or storing lubricant having a predetermined depth are formed in a symmetrical state. The concave portions 16 and 17 of the present embodiment have inner circumferential surfaces in the shape of an inverted cone, and their bottoms are communicated with each other by a through hole 18 penetrating the retainer body plate 11.

As described above, the retainer 3 of the present embodiment has left and right rectangular side surfaces 12 and 13 that form an inclined plane according to the arrangement of the left and right rollers mounted in the track 115. Therefore, by making line contact with the left and right rollers 2, it is possible to maintain a constant interval therebetween. In addition, since the left and right rectangular side surfaces 12 and 13 and the circular outer circumferential surface of the roller 2 are in line contact, the concave portions 16 and 17 for lubricating oil accumulation formed on the rectangular side surfaces 12 and 13 are adjacent to each other. Lubricating oil is smoothly supplied to the roller 2. In addition, since the concave portions 16 and 17 are in communication with each other, lubricant oil can be supplied to each portion in the track 115 through the retainer 3.

According to embodiments of the present invention, an automatic oil supply device is connected to a cross roller bearing. Therefore, it is possible to automatically supply the lubricating oil into the cross roller bearing.

In addition, since it includes a discharge hole through which waste lubricant can be discharged, the waste lubricant is smoothly discharged, so that the lubricant can be circulated inside the cross roller bearing. Therefore, it is possible to reduce the defects of the cross roller bearing.

In addition, it is possible to reduce the robot vibration caused by the failure of the cross roller bearing, and since it is possible to solve the problem of insufficient oil supply, which is the main cause of the failure of the cross roller bearing, the life of the cross roller bearing can be extended.

Although the above has been described with reference to the embodiments, those skilled in the art can variously modify and change the present invention within the scope not departing from the spirit and scope of the present invention described in the following claims. You will understand that there is.

100: cross roller bearing 110: outer ring portion
120: inner ring part 130: oil supply hole
200: automatic refueling device 300: refueling hose
210: first connecting portion 220: second connecting portion
230: body part

Claims (20)

An outer ring portion having a ring shape;
An inner ring portion having a ring shape concentric with the outer ring and disposed inside the outer ring;
A plurality of rollers disposed in a space between the outer ring portion and the inner ring portion;
A retainer disposed between the rollers;
A lubrication hole formed on an inner surface of the inner ring portion and having a central axis inclined with respect to the inner surface of the inner ring portion; And
It is connected to the oil supply hole and includes an automatic oil supply device for injecting lubricant into the space between the outer ring portion and the inner ring portion,
Wherein the automatic oil supply device automatically supplies lubricating oil using a difference between a first pressure inside the automatic oil supply device and a second pressure inside the space between the outer ring portion and the inner ring portion. The cross roller bearing according to claim 1, wherein the oil supply hole is formed on an inner surface of the inner ring part at intervals of 120 degrees from each other. The method of claim 2, wherein the oil supply hole
Two injection holes into which lubricant is injected; And
Cross roller bearing, characterized in that it comprises one discharge hole through which the lubricant is discharged. The cross roller bearing according to claim 1, wherein the oil supply hole is formed to be spaced apart from each other by 90 degrees on the inner surface of the inner ring part. The method of claim 4, wherein the oil supply hole
Three injection holes into which lubricant is injected; And
Cross roller bearing, characterized in that it comprises one discharge hole through which the lubricant is discharged. The cross roller bearing according to claim 1, wherein an angle formed by a central axis between the inner surface of the inner ring and the oil supply hole is 40 degrees or more and 50 degrees or less. delete The method of claim 1, wherein the automatic refueling device
Body part;
A first connection part coupled to the body part; And
A cross roller bearing comprising a second connection part coupled to the first connection part and discharging the lubricating oil supplied from the body part. The method of claim 8, wherein the body portion
A lubricating oil storage unit storing lubricating oil;
A lubricating oil support part supporting the stored lubricating oil;
A pressure maintaining unit providing pressure to the lubricant stored in the lubricant storage unit; And
Cross roller bearing, characterized in that it comprises a pressure support portion for supporting the pressure holding portion. The method of claim 8, wherein the first connection part
A first connection body connected to the body portion; And
A cross roller bearing comprising a first fastening part protruding from the first connecting part body and having a male thread shape. The method of claim 10, wherein the second connection part
A second connection body fastened to the first fastening part and having a female thread shape therein; And
Cross roller bearing, characterized in that it protrudes from the second connecting portion body, and includes an outlet having a stepped portion. delete The cross roller bearing according to claim 1, wherein the retainer comprises a retainer body plate having a rectangular contour. 14. The cross roller bearing according to claim 13, wherein the retainer body plate includes rectangular side surfaces that contact rollers adjacent to both sides thereof. The cross according to claim 14, wherein the rectangular side faces are inclined in a direction approaching each other from one edge toward the other edge along one diagonal direction on the surface thereof, and are mirror planes facing the center of the cross roller bearing. Roller bearings. 16. The cross roller bearing according to claim 15, wherein each of the rectangular side surfaces has a lubricating oil storage concave portion having a predetermined depth at its central portion. The cross roller bearing according to claim 16, wherein the concave portions are in communication with each other on the bottom surface of the retainer body plate. The cross roller bearing according to claim 1, wherein the roller has a cylindrical shape. The cross roller bearing according to claim 1, wherein 70 of the rollers and the retainers are each disposed. The cross roller bearing according to claim 1, wherein the amount of lubricating oil injected into the space between the outer ring portion and the inner ring portion is 12 cc or more and 13 cc or less.

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