Cross roller bearing and assembling method of cross roller bearing

Abstract

To suppress the leakage of a lubricant from a clearance between an insertion hole and a buried plug, in a cross roller bearing having the buried plug which is inserted into the insertion hole together with a seal material and a pin inserted into a pin hole to fix the buried plug.SOLUTION: A cross roller bearing 10 comprises; an outer ring 20 in which an outer ring raceway groove 21 is formed; an inner ring 30 in which an inner ring raceway groove 31 is formed; a plurality of rollers 40 arranged between the outer ring 20 and the inner ring 30; an insertion hole 22 for allowing the penetration of the outer ring 20 in a radial direction, a buried plug 50 for plugging the insertion hole 22; a pin hole 23 penetrating the buried plug 50 from a first-side side face 20c of the outer ring 20, and also penetrating it up to a second-side side face 20d; a pin 60 inserted into the pin hole 23, and fixing the buried plug 50; and a seal material 56 for sealing a clearance between the buried plug 50 and the insertion hole 22. In the bearing, burrs X protruding to the inside of the insertion hole 22 are formed when forming the pin hole 23, and the bearing has a burr removal part 25 from which the burrs X are removed.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to a cross roller bearing and a method of assembling a cross roller bearing. [Background technology]

[0002] Conventionally, there is known a cross roller bearing in which a number of rollers are arranged in an annular raceway formed between an outer ring and an inner ring, with the inclination directions of the axes alternating in the circumferential direction (see Patent Document 1). The cross roller bearing is assembled by inserting the rollers one by one into the raceway through insertion holes that penetrate the outer ring in the radial direction. In the cross roller bearing, the insertion holes are sealed with plugs after the insertion of the rollers is complete. After the plugs are inserted into the insertion holes, a pin is driven into them to fix them to the outer ring. In a cross roller bearing configured in this way, a sealant (O-ring) is provided between the inner circumferential surface of the insertion holes and the plugs to prevent leakage of lubricating oil from the insertion holes sealed with the plugs. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-11918 Summary of the Invention [Problem to be solved by the invention]

[0004] In the cross roller bearing, the plug is inserted into the insertion hole with a seal (O-ring) attached to its outer periphery. When the seal is inserted into the insertion hole together with the plug, it may come into contact with burrs generated when drilling the pin hole and be damaged when passing through the intersection between the pin hole for driving the pin and the insertion hole. For this reason, in the conventional cross roller bearing, lubricating oil may leak from between the plug and the insertion hole due to damage to the seal.

[0005] The present disclosure aims to suppress leakage of lubricating oil from between an insertion hole and a plug in a cross roller bearing having a plug that is inserted into an insertion hole together with a sealing material, and a pin that is inserted into a pin hole to secure the plug. [Means for solving the problem]

[0006] The cross roller bearing disclosed herein comprises an inner ring having an inner ring raceway groove formed therein, an outer ring having an outer ring raceway groove formed therein, a plurality of rollers arranged between the inner ring and the outer ring, an insertion hole radially penetrating the outer ring for incorporating the rollers between the inner ring raceway groove and the outer ring raceway groove, a plug for blocking the insertion hole, a pin hole penetrating from the side surface of the outer ring in the first axial direction through the plug to the end face in the second axial direction, a pin that is inserted into the pin hole and fixes the plug, and a sealing material for sealing between the plug and the insertion hole, and in which a burr protruding inwardly of the insertion hole is formed at the intersection where the pin hole and the insertion hole intersect when the pin hole is formed, and the cross roller bearing has a burr removal portion where the burr has been removed. Effect of the Invention

[0007] According to the cross roller bearing disclosed herein, in a cross roller bearing having a plug that is inserted into an insertion hole together with a sealing material, and a pin that is inserted into a pin hole to secure the plug, leakage of lubricating oil from between the insertion hole and the plug can be suppressed. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a cross-sectional schematic diagram showing a cross roller bearing of the present disclosure. [Diagram 2] FIG. 2 is a schematic cross-sectional view showing the outer ring. [Diagram 3] FIG. 3 is a schematic partial cross-sectional view showing the plug. [Figure 4] FIG. 4 is an explanatory diagram showing a state of burrs formed when drilling pin holes, and a process of removing the burrs to form a burr-free portion (first form). [Diagram 5] FIG. 5 is an explanatory diagram of a burr removing unit (second embodiment). [Figure 6] FIG. 6 is a flow diagram showing a method of assembling a cross roller bearing according to the present disclosure (first embodiment). [Figure 7] FIG. 7 is an explanatory diagram of a method of assembling a cross roller bearing (S11 to S12). [Figure 8] FIG. 8 is an explanatory diagram of the cross roller bearing assembly method (S13). [Figure 9] FIG. 9 is an explanatory diagram of the cross roller bearing assembly method (S14). [Figure 10] FIG. 10 is an explanatory diagram of the method of assembling the cross roller bearing (S15). [Figure 11] FIG. 11 is an explanatory diagram of a method of assembling a cross roller bearing (S20 to S21). [Figure 12] FIG. 12 is an explanatory diagram of the cross roller bearing assembly method (S22 to S23). [Figure 13] FIG. 13 is an explanatory diagram of the cross roller bearing assembly method (S24). [Figure 14] FIG. 14 is an explanatory diagram of the cross roller bearing assembly method (S25). [Figure 15] FIG. 15 is an explanatory diagram of the state of formation of recesses and burrs in the insertion hole. [Figure 16] FIG. 16 is a flow diagram showing a method of assembling a cross roller bearing according to the present disclosure (second embodiment). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] <Summary of the embodiment of the present disclosure> Below, an overview of the embodiments of the present disclosure will be listed and described.

[0010] (1) A cross roller bearing according to the present disclosure includes an outer ring having an outer ring raceway groove formed therein, an inner ring having an inner ring raceway groove formed therein, a plurality of rollers disposed between the outer ring and the inner ring, an insertion hole penetrating the outer ring in the radial direction for inserting the rollers between the outer ring raceway groove and the inner ring raceway groove, a plug for closing the insertion hole, a pin hole penetrating the plug from a side surface on a first axial side of the outer ring to an end surface on a second axial side, a pin inserted into the pin hole and fixing the plug, and a seal material for sealing between the plug and the insertion hole. When the pin hole is formed in the cross roller bearing according to the present disclosure, a burr is formed at an intersection where the pin hole and the insertion hole intersect, the burr protruding inwardly of the insertion hole. The cross roller bearing according to the present disclosure has a burr removal portion from which the burr is removed.

[0011] In the cross roller bearing of the above configuration, burrs that would damage the seal material when the plug and seal material are inserted into the insertion hole are removed. Therefore, the cross roller bearing of the above configuration can suppress damage to the seal material. In the cross roller bearing of the above configuration, in a cross roller bearing having a plug that is inserted into the insertion hole together with the seal material, and a pin that is inserted into the pin hole to fix the plug, leakage of lubricating oil from between the insertion hole and the plug can be suppressed.

[0012] (2) The cross roller bearing of the present disclosure includes an outer ring having an outer ring raceway groove, an inner ring having an inner ring raceway groove, a plurality of rollers disposed between the outer ring and the inner ring, an insertion hole penetrating the outer ring in the radial direction for inserting the rollers between the outer ring raceway groove and the inner ring raceway groove, a plug for closing the insertion hole, a pin hole penetrating the plug from a side surface on a first axial side of the outer ring to an end surface on a second axial side, a pin inserted into the pin hole and fixing the plug, and a seal material for sealing between the plug and the insertion hole. In the cross roller bearing of the present disclosure, a burr is formed at an intersection where the pin hole and the insertion hole intersect when the pin hole is formed. In the cross roller bearing of the present disclosure, the insertion hole includes a recess formed by recessing an area including an opening range of the pin hole radially outward inside the insertion hole, and the burr is formed inside the recess.

[0013] In the cross roller bearing of the above configuration, burrs that would damage the seal material when the plug and seal material are inserted into the insertion hole are formed in a position that does not come into contact with the seal material. Therefore, the cross roller bearing of the above configuration can suppress damage to the seal material. The cross roller bearing of the above configuration, in a cross roller bearing having a plug that is inserted into the insertion hole together with the seal material, and a pin that is inserted into the pin hole to fix the plug, can suppress leakage of lubricating oil from between the insertion hole and the plug.

[0014] (3) In the cross roller bearing of the present disclosure, it is preferable that the burrs include a first burr located in front of the pin hole and a second burr located behind the pin hole in the insertion direction of the plug into the insertion hole, and the burr removal portion is a portion where the second burr has been removed. In the cross roller bearing of the above configuration, the second burr, which is a main portion that damages the sealing material when the plug and sealing material are inserted into the insertion hole, is removed. Therefore, with the cross roller bearing of the above configuration, damage to the sealing material can be efficiently suppressed.

[0015] (4) In the cross roller bearing of the present disclosure, it is preferable that the burr removal portion is chamfered. With this cross roller bearing, the seal material can be guided along the chamfer so that the plug with the seal material attached can be smoothly inserted into the insertion hole.

[0016] (5) A method of assembling a cross roller bearing disclosed herein includes an outer ring having an outer ring raceway groove formed therein, an inner ring having an inner ring raceway groove formed therein, a plurality of rollers arranged between the outer ring and the inner ring, insertion holes radially penetrating the outer ring for assembling the rollers between the outer ring raceway groove and the inner ring raceway groove, a plug plug for blocking the insertion hole, a pin hole penetrating from a side surface of the outer ring on a first axial side thereof through the plug to an end face on a second axial side thereof, a pin inserted into the pin hole and fixing the plug plug, and a sealing material for sealing between the plug plug and the insertion hole, wherein when the pin hole is formed, a burr protruding inwardly of the insertion hole is formed at the intersection where the pin hole and the insertion hole intersect. The assembly method of a cross roller bearing disclosed herein includes a first step of inserting the rollers into the through holes, a second step of inserting a jig to block the pin holes into the pin holes after the first step, a third step of inserting the plugs together with the sealing material into the insertion holes after the second step, a fourth step of removing the jig from the pin holes after the third step, and a fifth step of inserting the pins into the pin holes after the fourth step.

[0017] In the method of assembling a cross roller bearing configured as above, when inserting the plug and sealing material into the insertion hole, a jig is used to prevent the sealing material from entering the pin hole. Therefore, the method of assembling a cross roller bearing configured as above can make it difficult for the sealing material to come into contact with burrs, thereby suppressing damage to the sealing material. The method of assembling a cross roller bearing configured as above can suppress leakage of lubricating oil from between the insertion hole and the plug in a cross roller bearing having a plug that is inserted into the insertion hole together with the sealing material, and a pin that is inserted into the pin hole to fix the plug.

[0018] (6) The method of assembling a cross roller bearing according to the present disclosure preferably further comprises a step of removing the burrs prior to the first step. In the above configuration, burrs that would damage the seal when inserting the plug and seal into the insertion hole are removed. Therefore, according to the method of assembling a cross roller bearing according to the above configuration, it is possible to more reliably prevent contact between the seal and the burrs, thereby suppressing damage to the seal.

[0019] (7) The method of assembling a cross roller bearing according to the present disclosure preferably further comprises, prior to the first step, a step of forming a recess inside the insertion hole by recessing an area including the opening range of the pin hole radially outward. In the case of the above configuration, the burrs that could damage the seal material when the plug and seal material are inserted into the insertion hole are formed in a position that does not contact the seal material. Therefore, according to the method of assembling a cross roller bearing having the above configuration, it is possible to more reliably prevent contact between the seal material and burrs, thereby suppressing damage to the seal material.

[0020] <Details of the embodiment of the present disclosure> Hereinafter, an embodiment of the present disclosure will be described.

[0021] [Overall configuration of the cross roller device of the present disclosure] Fig. 1 is a cross-sectional schematic diagram of a cross roller bearing of the present disclosure. Fig. 2 is a cross-sectional schematic diagram showing an outer ring. Fig. 1 shows a cross roller bearing 10, which is one embodiment of the cross roller bearing of the present disclosure. As shown in Fig. 1, the cross roller bearing 10 includes an outer ring 20, an inner ring 30, a plurality of rollers 40, a plug 50, and a pin 60.

[0022] Directions in this disclosure will now be described. The cross roller bearing 10 has a central axis C. The direction along the central axis C and the direction parallel to the central axis C are defined as the "axial direction", the direction perpendicular to the central axis C is defined as the "radial direction", and the direction along a circle centered on the central axis C is defined as the "circumferential direction". One axial side of the central axis C is referred to as the first side, and the other axial side is referred to as the second side.

[0023] As shown in FIG. 1 and FIG. 2, the outer ring 20 is cylindrical, and an outer ring raceway groove 21 is formed on the inner peripheral surface. The outer ring 20 has a central axis C1. In the cross roller bearing 10, the central axis C1 of the outer ring 20 coincides with the central axis C of the cross roller bearing 10. The outer ring raceway groove 21 has two raceway surfaces 21a, 21a that intersect at an angle of 90 degrees. The raceway surface 21a on the first side in the axial direction is a conical surface inclined at an inclination of 45 degrees with respect to the central axis C1. The raceway surface 21a on the second side in the axial direction is a conical surface inclined at an inclination of 135 degrees with respect to the central axis C1. The outer ring raceway groove 21 has an oil groove 21b formed in the center in the axial direction. The oil groove 21b is formed over the entire circumferential direction of the outer ring raceway groove 21 across the two raceway surfaces 21a, 21a.

[0024] As shown in FIG. 1, the inner ring 30 is cylindrical, and an inner ring raceway groove 31 is formed on the outer circumferential surface. The inner ring 30 has a central axis C2. In the cross roller bearing 10, the central axis C2 of the inner ring 30 coincides with the central axis C of the cross roller bearing 10. The inner ring raceway groove 31 has two raceway surfaces 31a, 31a that intersect at an angle of 90 degrees. The raceway surface 31a on the first side in the axial direction is a conical surface inclined at an inclination of 135° with respect to the central axis C2. The raceway surface 31a on the second side in the axial direction is a conical surface inclined at an inclination of 45° with respect to the central axis C2. The inner ring raceway groove 31 has an oil groove 31b formed in the center in the axial direction. The oil groove 31b is formed over the entire circumferential direction of the inner ring raceway groove 31 across the two raceway surfaces 31a, 31a.

[0025] 1, in cross roller bearing 10, outer ring raceway groove 21 and inner ring raceway groove 31 form roller raceway groove 15 for accommodating rollers 40. When outer ring 20 and inner ring 30 are cut by a plane including central axis C, the cross-sectional shape of roller raceway groove 15 is approximately square.

[0026] The rollers 40 are cylindrical rollers whose axial length and radial length are approximately the same. The rollers 40 are accommodated in the roller raceway groove 15. The multiple rollers 40 accommodated in the roller raceway groove 15 are arranged in the circumferential direction of the roller raceway groove 15 with the orientation of the roller axial direction alternately changed by 90°. The cross roller bearing 10 is a bearing in which the rollers 40 adjacent in the circumferential direction are arranged in contact with each other, and is a so-called "full complement bearing".

[0027] As shown in Figures 1 and 2, the outer ring 20 has an insertion hole 22 for inserting a roller 40 into the roller raceway groove 15. The insertion hole 22 is a hole with a cylindrical inner circumferential surface, and penetrates from the outer circumferential surface 20a on the radial outside of the outer ring 20 to the inner circumferential surface 20b on the radial inside. The center of the insertion hole 22 coincides with the center position of the outer ring raceway groove 21 in the axial direction. As shown in Figure 1, after the roller 40 is accommodated in the roller raceway groove 15 through the insertion hole 22, a plug 50 and a sealant 56 are inserted into the insertion hole 22 to seal it.

[0028] FIG. 3 is a partial cross-sectional schematic diagram showing a plug. The plug 50 shown in FIG. 3 is made of a cylindrical metal member and includes a first portion 51 at one end in the axial direction, a second portion 52 at the other end in the axial direction, and a ring groove 53 formed between the first portion 51 and the second portion 52. The plug 50 is used in a state where a ring-shaped seal material 56 is fitted into the ring groove 53 in a final installation state. In the cross roller bearing 10 of the present disclosure, the seal material 56 is an O-ring. In the first portion 51 of the plug 50, a pin hole 54 that is a part of the pin hole 23 described later is formed. In the second portion 52 of the plug 50, a raceway groove 55 that is a part of the outer ring raceway groove 21 is formed. In a state where the plug 50 is temporarily inserted into the insertion hole 22, the plug 50 is used in a state where the seal material 56 is not attached to the ring groove 53.

[0029] 1 and 2, the outer ring 20 further includes a pin hole 23. The pin hole 23 is a hole for inserting a pin 60 that fixes the plug 50 inserted into the insertion hole 22. In the cross roller bearing 10 of the present disclosure, the pin 60 is a tapered pin made of metal.

[0030] The pin hole 23 is a tapered hole having a conical inner peripheral surface, and penetrates from the side surface 20c on the first axial side of the outer ring 20 to the side surface 20d on the second axial side. The pin hole 23 has a central axis C3 defined therein. The central axis C3 of the pin hole 23 is parallel to the central axis C1 of the outer ring 20 and perpendicular to the central axis of the insertion hole 22. The pin hole 23 is drilled using a tool such as a drill with the plug 50 inserted into the insertion hole 22. A portion of the pin hole 23 is drilled as a pin hole 54 in the first portion 51 of the plug 50.

[0031] [About Kaeri] 4 is an explanatory diagram of the state of burrs formed when drilling a pin hole, and the process of removing the burrs to form a burr-removed portion (first form). As shown in the upper diagram of FIG. 4, the outer ring 20 has a portion where the insertion hole 22 and the pin hole 23 intersect. When drilling the pin hole 23, the outer ring 20 generates a burr X that protrudes toward the insertion hole 22 at the boundary between the insertion hole 22 and the pin hole 23 (around the pin hole 23 that opens inside the insertion hole 22). The burr X is a portion that is generated when a member (metal) constituting the outer ring 20 is dragged by the advancement and retreat of the drill when drilling the pin hole 23, and a part of the member protrudes toward the insertion hole 22. The burr X has a sharp tip and can damage the seal material 56 that comes into contact with the burr X. The burrs X include a first burr X1 located in front of the pin hole 23 (radially outward from the central axis C3 in FIG. 4) in the insertion direction Z of the plug 50 into the insertion hole 22 (the direction of the arrow shown in FIG. 4), and a second burr X2 located behind the pin hole 23 (radially inward from the central axis C3 in FIG. 4).

[0032] [Cross roller bearing according to the first embodiment] The cross roller bearing 10 according to the first embodiment of the present disclosure has a burr removal portion 25, as shown in the lower diagram of FIG. 4. The burr removal portion 25 is a portion where the burr X protruding into the inside of the insertion hole 22 has been removed. The burr removal portion 25 may be a portion where the burr X has been removed by chamfering the portion where the burr X was formed. When the burr removal portion 25 is formed by chamfering the portion where the burr X was formed, the chamfer can be used as a portion for guiding the sealing material 56. Therefore, when the burr removal portion 25 is formed by chamfering, the plug 50 to which the sealing material 56 is attached can be smoothly inserted into the insertion hole 22. Note that the burr removal portion 25 only needs to have the burr X removed, and does not necessarily need to be actively chamfered.

[0033] As a result of intensive research by the inventors of the present application, it has been found that the first burr X1 of the burrs X is almost unlikely to damage the sealing material 56 when the plug 50 is inserted, while the second burr X2 is highly likely to damage the sealing material 56 when the plug 50 is inserted.

[0034] In the burr removing portion 25 shown in the lower diagram of FIG. 4, only the second burr X2 of the burrs X is removed. As shown in the lower diagram of FIG. 4, in the cross roller bearing 10 of the present disclosure, the burr removing portion 25 may be a portion where at least the second burr X2 is removed. As shown in the upper diagram of FIG. 4, the burr removing portion 25 can be easily removed in a short time by inserting a polishing tool 81 into the insertion hole 22 from the inner peripheral surface 20b side of the outer ring 20 and bringing the tool 81 into contact with the second burr X2. On the other hand, it is difficult to remove the first burr X1 with the tool 81 inserted from the inner peripheral surface side of the outer ring 20, and it becomes necessary to use another tool for removing the first burr X1. Therefore, unlike the second burr X2, the first burr X1 is difficult to remove easily in a short time.

[0035] The cross roller bearing 10 according to the first embodiment of the present disclosure has a burr removal portion 25 in which only the second burr X2 has been removed, and thereby the effect of suppressing damage to the sealing material 56 can be easily obtained by simply processing the outer ring 20.

[0036] Fig. 5 is an explanatory diagram of a burr removal portion (second embodiment). The burr removal portion 25 in the cross roller bearing 10 according to the first embodiment of the present disclosure may be in the form shown in Fig. 5. The burr removal portion 25 shown in Fig. 5 has both the first burr X1 and the second burr X2 removed. The cross roller bearing 10 according to the first embodiment of the present disclosure has the burr removal portion 25 from which both the first burr X1 and the second burr X2 have been removed, thereby achieving the effect of suppressing damage to the seal material 56.

[0037] [Method of assembling a cross roller bearing (first embodiment)] Fig. 6 is a flow diagram showing a method of assembling a cross roller bearing (first embodiment) of the present disclosure. Figs. 7 to 14 are explanatory views of each step in the method of assembling a cross roller bearing. Here, a method of assembling a cross roller bearing 10 using an outer ring 20 having a burr removal portion 25 (defined as a first embodiment of a method of assembling a cross roller bearing 10) will be described. As shown in Fig. 6, the method of assembling a cross roller bearing according to the first embodiment of the present disclosure carries out a preparation process including steps (S11) to (S16) and an assembly process including steps (S20) to (S25).

[0038] [Preparation process] The preparation step is a step of making preparations necessary for assembling the cross roller bearing 10. As shown in Figures 6 and 7, in the preparation step of the method for assembling the cross roller bearing 10 according to the first embodiment, first, step (S11) is carried out in which the plug 50 is temporarily inserted into the insertion hole 22. The plug 50 in step (S11) is temporarily inserted and will be removed from the insertion hole 22 later. The plug 50 in step (S11) is inserted into the insertion hole 22 without the seal material 56 attached. At this point in time, the outer ring 20 does not yet have the outer ring raceway groove 21 formed therein, and the pin hole 23 has not yet been drilled therein. At this point in time, the plug 50 does not yet have the pin hole 54 and the raceway groove 55 formed therein.

[0039] As shown in Figs. 6 and 7, the method for assembling the cross roller bearing 10 according to the first embodiment next includes a step (S12) of drilling the pin hole 23. In step (S12), the pin hole 23 is drilled through the outer ring 20 from the side surface 20c on the first side in the axial direction to the side surface 20d on the second side by a tool (drill) not shown. When forming the pin hole 23, the plug 50 temporarily inserted in the insertion hole 22 is formed with a pin hole 54 penetrating the first portion 51. The pin hole 23 and the pin hole 54 are formed in the axial direction along the central axis C3. The central axis C3 is perpendicular to the central axis of the insertion hole 22. The pin hole 23 and the pin hole 54 are tapered holes whose inner diameters become smaller (tapered) from the first side to the second side in the axial direction.

[0040] 6 and 8, the method for assembling the cross roller bearing 10 according to the first embodiment next carries out a step (S13) of provisionally inserting the pin 60 into the pin hole 23. In step (S13), the pin 60 is inserted into the pin hole 23 from the first side to the second side in the axial direction. The pin 60 is a tapered pin whose outer shape becomes smaller (tapered) from the first side to the second side in the axial direction.

[0041] 6 and 9, the assembly method according to the first embodiment of cross roller bearing 10 next carries out a step (S14) of forming outer ring raceway groove 21 on inner circumferential surface 20b of outer ring 20, and forming a part of outer ring raceway groove 21 (raceway groove 55) in second portion 52 of plug 50. In step (S14), outer ring 20 has outer ring raceway groove 21 formed, and plug 50 temporarily inserted into insertion hole 22 has raceway groove 55, which will become part of outer ring raceway groove 21, formed at the same time as outer ring raceway groove 21 is formed.

[0042] 6 and 10, the method of assembling cross roller bearing 10 according to the first embodiment next carries out a step (S15) of removing the temporarily inserted pin 60 and plug 50 from the outer ring 20. In step (S15), the pin 60 is extracted from the pin hole 23, and the plug 50 is extracted from the insertion hole 22. At this point, the plug 50 has a pin hole 54 and a raceway groove 55 formed therein. The plug 50 and pin 60 removed here will be used again in the assembly process.

[0043] As shown in Figs. 4 and 6, the method for assembling the cross roller bearing 10 according to the first embodiment next includes a step (S16) of removing the burrs X formed at the intersection between the insertion hole 22 and the pin hole 23 to form the burr-removed portion 25. In step (S16), as shown in Fig. 4, at least the second burr X2 of the burrs X is removed. Note that in step (S16), all of the burrs X (the first burr X1 and the second burr X2) may be removed as shown in Fig. 5. This completes the preparation step. The outer ring 20 for which the preparation step has been completed is entirely heat-treated, and then the outer ring raceway groove 21 is polished, and the entire outer ring is surface-treated before being used in the subsequent assembly step.

[0044] [Assembly process] The assembly process is a process for assembling the cross roller bearing 10. As shown in Figures 6 and 11, the assembly method according to the first embodiment of the cross roller bearing 10 first performs a step (S20) of combining the outer ring 20 and the inner ring 30 in the assembly process. In step (S20), the outer ring 20 and the inner ring 30 are formed by inserting the inner ring 30 into the inner periphery of the outer ring 20 and matching the outer ring raceway groove 21 and the inner ring raceway groove 31 to form the roller raceway groove 15.

[0045] 6 and 11, the method of assembling cross roller bearing 10 according to the first embodiment next carries out step (S21) of inserting rollers 40 from insertion holes 22 into roller race groove 15. In step (S20), rollers 40 are inserted one by one into roller race groove 15 from insertion holes 22. The rollers 40 inserted into roller race groove 15 are arranged in the circumferential direction of roller race groove 15 with the orientation of the roller axial direction alternately changed by 90°.

[0046] As shown in FIG. 6 and FIG. 12, the method for assembling the cross roller bearing 10 according to the first embodiment next includes a step (S22) of inserting a jig 70 into the pin hole 23. The jig 70 is a tool for closing the opening of the pin hole 23 in the insertion hole 22. The jig 70 is arranged in pairs on a first axial side and a second axial side of the outer ring 20. The jig 70 is configured to be displaceable in the axial direction by a displacement device (actuator) not shown. The jig 70 includes a shaft 71 to be inserted into the pin hole 23. The shaft 71 provided on the first axial side has a length equal to or greater than the distance from the side surface 20c of the outer ring 20 to the inner peripheral surface of the insertion hole 22. The shaft 71 provided on the second axial side has a length equal to or greater than the distance from the side surface 20d of the outer ring 20 to the inner peripheral surface of the insertion hole 22. The shaft 71 is inserted into a position where a tip surface 72 is flush with the inner peripheral surface of the insertion hole 22. The shaft 71 may be inserted at a position where the tip surface 72 protrudes slightly into the insertion hole 22 as long as it is positioned at a position where the sealing material 56 can be prevented from entering the pin hole 23 .

[0047] 6 and 12, the method for assembling cross roller bearing 10 according to the first embodiment next carries out a step (S23) of inserting plug 50 with sealing material 56 attached into insertion hole 22. When sealing material 56 is inserted into insertion hole 22 together with plug 50 with shaft 71 inserted into pin hole 23, sealing material 56 passes through the intersection between insertion hole 22 and pin hole 23 while contacting tip surface 72 of shaft 71. For this reason, sealing material 56 is inserted into a predetermined position without getting caught in the opening of pin hole 23 in insertion hole 22. With this configuration, the method for assembling cross roller bearing 10 according to the first embodiment can reliably suppress damage to sealing material 56 when inserted into insertion hole 22.

[0048] Furthermore, because the cross roller bearing 10 according to the first embodiment has the burr removal portion 25 (i.e., the burrs X have been removed), the seal material 56 is inserted into the predetermined position without coming into contact with the burrs X. With this configuration, the assembly method for the cross roller bearing 10 according to the first embodiment can suppress damage to the seal material 56 when it is inserted into the insertion hole 22.

[0049] 6 and 13, the method for assembling cross roller bearing 10 according to the first embodiment next carries out a step (S24) of removing jig 70 from pin hole 23. In step (S24), jig 70 is displaced by a displacement device (actuator) (not shown), and is removed from pin hole 23.

[0050] 6 and 14, the method of assembling cross roller bearing 10 according to the first embodiment next carries out a step (S25) of inserting pin 60 into pin hole 23. In step (S25), pin 60 is inserted into pin hole 23 from the first side to the second side in the axial direction. In step (S25), pin 60 is driven into pin hole 23. Plug 50 is fixed to outer ring 20 by driving pin 60 into pin hole 23 and pin hole 54. This completes the assembly process and the assembly of cross roller bearing 10.

[0051] [Cross roller bearing according to the second embodiment] FIG. 15 is an explanatory diagram of the formation of the recess and the burr in the insertion hole. The cross roller bearing 10 according to the second embodiment of the present disclosure has a burr X generated at a position that does not protrude into the inside of the insertion hole 22. The burr X shown in FIG. 15 does not protrude into the inside of the insertion hole 22, so it does not need to be removed to avoid contact with the seal material. As shown in FIG. 15, the cross roller bearing 10 according to the second embodiment of the present disclosure forms a recess 27 in a region including a portion where the pin hole 23 opens inside the insertion hole 22. The recess 27 is a recess including a spherical surface formed by pressing a tool 82 having a spherical grindstone against the inner peripheral surface of the insertion hole 22. Note that the shape of the recess 27 is not limited to this, and may be a recess including a shape other than a spherical surface.

[0052] [Method of assembling a cross roller bearing (second embodiment)] FIG. 16 is a flow diagram showing a method for assembling a cross roller bearing according to the present disclosure (second embodiment). Here, a method for assembling a cross roller bearing 10 using an outer ring 20 having a recess 27 (not having a burr removing portion 25) (defined as a second embodiment of a method for assembling a cross roller bearing 10) will be described. As shown in FIG. 16, the method for assembling a cross roller bearing according to the second embodiment of the present disclosure includes a preparation process including steps (S10) to (S15) and an assembly process including steps (S20) to (S25). In other words, the method for assembling a cross roller bearing according to the second embodiment of the present disclosure differs from the method for assembling a cross roller bearing according to the first embodiment of the present disclosure in that step (S10) is added to the preparation process and step (S16) is omitted, but the assembly process is the same. Here, the different steps will be described, and a description of the common steps will be omitted.

[0053] 15 and 16, in the assembly method for cross roller bearing 10 according to the second embodiment, a preparation process first includes a step (S10) of forming recesses 27 on the inside of insertion hole 22. In step (S10), recesses 27 are formed in insertion hole 22 using a spherical tool over a range including the opening area of ​​pin hole 23 on its inner circumferential surface.

[0054] In this case, as shown in Fig. 15, burrs X formed when drilling pin holes 23 are located inside recesses 27 and do not protrude into insertion holes 22. When plugs 50 and sealant 56 are inserted into insertion holes 22, burrs X located inside recesses 27 do not come into contact with sealant 56. For this reason, the assembly method of the cross roller bearing according to the second embodiment of the present disclosure does not require the removal of burrs X. The assembly method of cross roller bearing 10 according to the second embodiment does not require the step (S16) of removing burrs X that was necessary in the assembly method of the first embodiment (see Fig. 6).

[0055] Because cross roller bearing 10 according to the second embodiment has recess 27, sealing material 56 can be inserted to a predetermined position without coming into contact with burrs X. With this configuration, the assembly method for cross roller bearing 10 according to the second embodiment can prevent damage to sealing material 56 when inserted into insertion hole 22.

[0056] [Actions and Effects of the Present Embodiment] (1) The cross roller bearing 10 according to the first embodiment includes an outer ring 20 having an outer ring raceway groove 21 formed therein, an inner ring 30 having an inner ring raceway groove 31 formed therein, a plurality of rollers 40 disposed between the outer ring 20 and the inner ring 30, an insertion hole 22 penetrating the outer ring 20 in the radial direction for fitting the rollers 40 between the outer ring raceway groove 21 and the inner ring raceway groove 31, a plug 50 for plugging the insertion hole 22, a pin hole 23 penetrating the plug 50 from a side surface 20c on the first axial side of the outer ring 20 to a side surface 20d on the second axial side, a pin 60 inserted into the pin hole 23 and fixing the plug 50, and a seal material 56 for sealing between the plug 50 and the insertion hole 22. When the pin hole 23 is formed in the cross roller bearing 10 of the present disclosure, a burr X protruding inwardly of the insertion hole 22 is formed at the intersection of the pin hole 23 and the insertion hole 22. Cross roller bearing 10 of the present disclosure has burr removal portion 25 from which burrs X have been removed.

[0057] In the cross roller bearing 10 configured as above, burrs X that would damage the sealing material 56 when the plug 50 and sealing material 56 are inserted into the insertion hole 22 are removed. Therefore, the cross roller bearing 10 configured as above can suppress damage to the sealing material 56. The cross roller bearing 10 configured as above can suppress leakage of lubricating oil from between the insertion hole 22 and the plug 50 in the cross roller bearing 10 having the plug 50 inserted into the insertion hole 22 together with the sealing material 56, and the pin 60 inserted into the pin hole 23 to fix the plug 50.

[0058] (2) The cross roller bearing 10 according to the second embodiment includes an outer ring 20 having an outer ring raceway groove 21 formed therein, an inner ring 30 having an inner ring raceway groove 31 formed therein, a plurality of rollers 40 disposed between the outer ring 20 and the inner ring 30, an insertion hole 22 penetrating the outer ring 20 in the radial direction for fitting the rollers 40 between the outer ring raceway groove 21 and the inner ring raceway groove 31, a plug 50 for plugging the insertion hole 22, a pin hole 23 penetrating the plug 50 from a side surface 20c on the first axial side of the outer ring 20 to a side surface 20d on the second axial side, a pin 60 inserted into the pin hole 23 and fixing the plug 50, and a seal material 56 for sealing between the plug 50 and the insertion hole 22. When the pin hole 23 is formed in the cross roller bearing 10 of the present disclosure, a burr X is formed at the intersection where the pin hole 23 and the insertion hole 22 intersect. In the cross roller bearing 10 of the present disclosure, the insertion hole 22 is provided with a recess 27 formed by recessing an area including the opening range of the pin hole 23 radially outward inside the insertion hole 22, and a burr X is formed inside the recess 27.

[0059] In the cross roller bearing 10 configured as above, burrs X that would damage the sealing material 56 when the plug 50 and sealing material 56 are inserted into the insertion hole 22 are formed in a position that does not contact the sealing material 56. Therefore, the cross roller bearing 10 configured as above can suppress damage to the sealing material 56. The cross roller bearing 10 configured as above can suppress leakage of lubricating oil from between the insertion hole 22 and the plug 50 in the cross roller bearing 10 having the plug 50 inserted into the insertion hole 22 together with the sealing material 56, and the pin 60 inserted into the pin hole 23 to fix the plug 50.

[0060] (3) In the cross roller bearing 10 according to the first embodiment, the burrs X include a first burr X1 located in front of the pin hole 23 and a second burr X2 located behind the pin hole 23 in the insertion direction of the plug 50 into the insertion hole 22, and the burr removal portion 25 is a portion where the second burr X2 has been removed. In the cross roller bearing 10 having the above configuration, at least the second burr X2, which is a main portion that damages the sealing material 56 when the plug 50 and the sealing material 56 are inserted into the insertion hole 22, has been removed. The second burr X2 can be easily removed using a simple tool. Therefore, the cross roller bearing 10 having the above configuration can efficiently suppress damage to the sealing material 56.

[0061] (4) In the cross roller bearing 10 according to the first embodiment described above, the burr removal portion 25 is chamfered. According to the cross roller bearing 10 having the above configuration, the sealing material 56 can be guided along the chamfer, and the plug 50 to which the sealing material 56 is attached can be smoothly inserted into the insertion hole 22.

[0062] (5) A method of assembling a cross roller bearing 10 according to the above embodiment includes an outer ring 20 with an outer ring raceway groove 21 formed therein, an inner ring 30 with an inner ring raceway groove 31 formed therein, a plurality of rollers 40 arranged between the outer ring 20 and the inner ring 30, an insertion hole 22 penetrating the outer ring 20 in the radial direction for fitting the rollers 40 between the outer ring raceway groove 21 and the inner ring raceway groove 31, a plug 50 for plugging the insertion hole 22, a pin hole 23 penetrating the plug 50 from a side surface 20c on the first axial side of the outer ring 20 to a side surface 20d on the second axial side, a pin 60 inserted into the pin hole 23 and fixing the plug 50, and a seal material 56 for sealing between the plug 50 and the insertion hole 22. The cross roller bearing 10 according to the present disclosure is a method of assembling a cross roller bearing 10 in which, when forming the pin hole 23, a burr X protruding inwardly of the insertion hole 22 is formed at the intersection where the pin hole 23 and the insertion hole 22 intersect. The assembly method of the cross roller bearing 10 of this embodiment includes a first step (S21) of inserting rollers 40 into insertion holes 22, a second step (S22) of inserting a jig 70 for blocking pin hole 23 into the pin hole 23 after the first step (S21), a third step (S23) of inserting plug 50 together with sealing material 56 into insertion hole 22 after the second step (S22), a fourth step (S24) of removing jig 70 from pin hole 23 after the third step (S23), and a fifth step (S25) of inserting pin 60 into pin hole 23 after the fourth step (S24).

[0063] In the method of assembling cross roller bearing 10 configured as described above, when inserting plug 50 and sealing material 56 into insertion hole 22, jig 70 is used to prevent sealing material 56 from entering pin hole 23. Therefore, according to the method of assembling cross roller bearing 10 of the present embodiment, sealing material 56 is less likely to come into contact with burrs X, and damage to sealing material 56 can be suppressed. According to the method of assembling cross roller bearing 10 of the present embodiment, in cross roller bearing 10 having plug 50 inserted into insertion hole 22 together with sealing material 56, and pin 60 inserted into pin hole 23 to fix plug 50, leakage of lubricating oil from between insertion hole 22 and plug 50 can be suppressed.

[0064] (6) The method of assembling cross roller bearing 10 according to the first embodiment described above further includes a step (S16) of removing burrs X prior to the first step (S21). In the above configuration, burrs X that would damage sealing material 56 when plug 50 and sealing material 56 are inserted into insertion hole 22 are removed. Therefore, according to the method of assembling cross roller bearing 10 according to the first embodiment, contact between sealing material 56 and burrs X can be more reliably prevented, and damage to sealing material 56 can be suppressed.

[0065] (7) The method of assembling cross roller bearing 10 according to the second embodiment described above further includes, prior to the first step (S21), a step (S10) of forming a recess by recessing an area including the opening range of pin hole 23 radially outward inside insertion hole 22. In the case of the above configuration, burrs X, which could damage sealing material 56 when plug 50 and sealing material 56 are inserted into insertion hole 22, are formed in a position that does not contact sealing material 56. Therefore, according to the method of assembling cross roller bearing 10 configured as described above, it is possible to more reliably prevent contact between sealing material 56 and burrs X, thereby preventing damage to sealing material 56.

[0066] The above-described embodiment is illustrative in all respects and is not restrictive. The scope of the present invention is indicated by the claims rather than the above-described embodiment, and includes all modifications within the scope equivalent to the configurations described in the claims. [Explanation of symbols]

[0067] 10 Cross roller bearing 20 Outer ring 20c (first axial side) side 20d (Axial Second Side) Side 21 Outer ring raceway groove 22 Insertion hole 23 Pin hole 25 Burr removal section 27 Recess 30 Inner Circle 31 Inner ring raceway groove Around 40 50 Plug 56 Sealing material 60 pin 70 Jig X Kaeri X1 First Return X2 The second return

Claims

1. an outer ring having an outer ring raceway groove; an inner ring having an inner ring raceway groove; a plurality of rollers disposed between the outer ring and the inner ring; an insertion hole penetrating the outer ring in a radial direction for inserting the roller between the outer ring raceway groove and the inner ring raceway groove; A plug that blocks the insertion hole; a pin hole penetrating from a side surface on a first axial direction side of the outer ring through the plug to an end surface on a second axial direction side; a pin that is inserted into the pin hole and fixes the plug; a sealant that seals between the plug and the insertion hole, A cross roller bearing in which a burr protruding inwardly from the insertion hole is formed at an intersection where the pin hole and the insertion hole intersect when the pin hole is formed, A cross roller bearing having a burr removal portion from which the burrs have been removed.

2. an outer ring having an outer ring raceway groove; an inner ring having an inner ring raceway groove; a plurality of rollers disposed between the outer ring and the inner ring; an insertion hole penetrating the outer ring in a radial direction for inserting the roller between the outer ring raceway groove and the inner ring raceway groove; A plug that blocks the insertion hole; a pin hole penetrating from a side surface on a first axial direction side of the outer ring through the plug to an end surface on a second axial direction side; a pin that is inserted into the pin hole and fixes the plug; a sealant that seals between the plug and the insertion hole, A cross roller bearing in which a burr is formed at an intersection where the pin hole and the insertion hole intersect when the pin hole is formed, The insertion hole includes a recess formed by recessing an area including an opening range of the pin hole radially outward on the inside of the insertion hole, A cross roller bearing, wherein the burr is formed inside the recess.

3. the burrs include a first burr located in front of the pin hole in an insertion direction of the plug into the insertion hole, and a second burr located behind the pin hole, 2. The cross roller bearing according to claim 1, wherein the burr removal portion is a portion where at least the second burr has been removed.

4. 2. The cross roller bearing according to claim 1, wherein the burr removing portion is chamfered.

5. an outer ring having an outer ring raceway groove; an inner ring having an inner ring raceway groove; a plurality of rollers disposed between the outer ring and the inner ring; an insertion hole penetrating the outer ring in a radial direction for inserting the roller between the outer ring raceway groove and the inner ring raceway groove; A plug that blocks the insertion hole; a pin hole penetrating from a side surface on a first axial direction side of the outer ring through the plug to an end surface on a second axial direction side; a pin that is inserted into the pin hole and fixes the plug; a sealant that seals between the plug and the insertion hole, A method for assembling a cross roller bearing, the method including the steps of: forming a burr protruding inwardly of the insertion hole at an intersection where the pin hole and the insertion hole intersect when forming the pin hole, the method comprising the steps of: a first step of inserting the roller into the through hole; a second step of inserting a jig into the pin hole to close the pin hole after the first step; a third step of inserting the plug together with the sealing material into the insertion hole after the second step; a fourth step of removing the jig from the pin hole after the third step; a fifth step, after the fourth step, of inserting the pin into the pin hole; A method for assembling a cross roller bearing, comprising:

6. 6. The method for assembling a cross roller bearing according to claim 5, further comprising the step of removing said burrs prior to said first step.

7. 6. The method for assembling a cross roller bearing according to claim 5, further comprising, prior to the first step, a step of forming a recess by recessing an area including an opening range of the pin hole radially outward inside the insertion hole.

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