JP7221664B2 - cross roller bearing - Google Patents

Description

For example, the present invention consists of an outer ring, an inner ring that rotates relative to the outer ring, and rollers that are rolling elements disposed between the two, and a mounting hole for mounting the roller is formed in either the outer ring or the inner ring. related to cross roller bearings.

In recent years, crossed roller bearings have been used in various devices such as industrial robots, measurement and inspection equipment, medical equipment, optical equipment, etc., which are equipped with joints, revolving parts, swinging parts, etc. that receive loads in multiple directions. Various types, structures, and sizes have been commercialized according to the application, and there is a demand for compact, lightweight, high-precision, and low-cost products.

Conventionally, a slewing bearing is known which is composed of an outer ring and an inner ring which rotates relative to the outer ring via rollers, which are rolling elements. In the slewing bearing, a notch is formed in the end surface of the bearing ring with a cut surface parallel to the circumferential direction, and the notch is used as a roller mounting hole, and the mounting hole is closed with a lid having a matching shape. In addition, the slewing bearing described above is one in which the lid is fitted into the insertion window and fixed with a pin, and heat treatment and processing are performed at the same time as the inner ring to reduce the step (see, for example, Patent Document 1).

Also, as a method of manufacturing crossed roller bearings, there is known a method in which cylindrical rollers are inserted into raceway grooves through roller insertion holes formed in the end face of the inner ring. The cross roller bearing has roller insertion grooves formed in the annular end surface of the inner ring. In the manufacturing method described above, after the roller insertion groove is formed in the inner ring, the plug is press-fitted therein, and in this state, the inner ring is ground and finished to a perfect circle. Next, when the press-fit plug is removed, the inner ring is slightly narrowed. If the rollers are inserted in this state, the distance between the roller insertion portions between the inner ring and the outer ring is widened, making it easier to insert the cylindrical rollers. After the rollers are inserted, the inner ring returns to a perfect circle by pressing the plug into the roller insertion groove (see, for example, Patent Document 2).

Also, as a crossed roller bearing with a lid, there is known a bearing in which a lid is fitted into a roller mounting hole formed on the outer surface of a bearing ring to realize smooth rotation at high speed. In the cross roller bearing, the rollers are arranged through an assembly hole between the outer ring and the inner ring, and the cover is fitted into the assembly hole. The outer surface of the lid is ground at the same time as the outer peripheral surface of the outer ring and is fixed in a recessed position from the outer peripheral surface. are formed (see, for example, Patent Document 3).

Further, as a cross roller bearing, there is known one in which an insertion hole is formed in the end face of an inner ring or an outer ring, and the side surface of a plug that closes the insertion hole is formed in a tapered portion. In the cross roller bearing, a plug having a rolling surface on which the cylindrical roller rolls, two radial outer surfaces and a circumferential outer surface is fitted and fixed in the insertion hole. The radial outer surface that contacts the radial inner surface of the insertion hole and the circumferential outer surface that contacts the circumferential inner surface are tapered for positioning in the radial and circumferential directions (for example, patent Reference 4).

Also, as a cross roller bearing, there is known one in which a stopper is positioned in a roller insertion hole formed in an inner ring without striking a pin. The cross roller bearing has plugs fixed to roller insertion holes formed in the inner ring. The inner peripheral side surface of the roller insertion hole is formed with left and right flat surface portions and semicircular concave surface portions that smoothly continue to the flat surface portions. The outer peripheral side surface of the plug is formed with a flat surface portion that is in close contact with the flat surface portion and a semicircular convex surface portion that is in close contact with the concave surface portion. When the plug is fitted into the roller insertion hole, these parts are brought into close contact with each other, and the plug is automatically positioned in the radial direction and the direction perpendicular to it. Further, a groove is provided on the axial bottom surface of the roller insertion hole, and a protrusion that fits into the groove is provided on the cover, and the positioning is performed by fitting the cover. Therefore, there is no need to fix the stopper using a positioning pin or the like (see, for example, Patent Document 5).

FR2142793 JP-A-2001-065559 JP-A-2005-180578 JP 2011-106544 A JP-A-2000-179545

By the way, cross roller bearings are used in the rotating parts of robot joints, precision machines, etc., and are required to have high rotational accuracy. In the cross roller bearing, an outer ring or an inner ring, which is a bearing ring, is formed with a mounting hole for mounting a roller, that is, a cylindrical roller, and a lid is provided to close the mounting hole. However, when the cross roller bearing rotates, noise and noise may occur. One of the reasons for this is that the lid is misaligned, and a step is generated between the raceway surface of the outer ring or the inner ring and the raceway surface of the lid. It is thought to occur when crossing the Therefore, in crossed roller bearings, after the cover is attached to the raceway and the raceway surface of the raceway ring and the raceway surface of the lid are machined simultaneously, the lid is attached to the raceway ring when the rolling elements are loaded into the mounting hole. After removing the cover from the hole and loading the rolling elements into the raceway through the assembly hole, the lid is reattached to the assembly hole. There was also the issue of how to configure the mounting hole, and there was also a demand for cross roller bearings to eliminate the step between the raceway ring and the lid, which causes abnormal noise and poor rotation.

In addition, in the one-piece bearing ring type slewing bearings of the above Patent Documents 1, 2, 4, and 5, as a method of incorporating the rolling elements into the bearing ring, a part of the bearing ring is notched to form an opening in the raceway. forming. Further, in the lidded cross roller bearing of Patent Document 3, a technique is disclosed in which a mounting hole is drilled to reach the raceway from the outer circumference or the inner circumference, and the rolling elements are respectively mounted. In addition, in any of the patent documents, heat treatment and grinding are performed with a lid that closes the roller insertion part attached, and after removing the lid and inserting the rolling elements into the raceway, the lid is attached to the mounting hole again. It is designed to reduce the difference in level between the lid and the bearing ring.

In addition, in the crossed roller bearings of Patent Documents 1 to 3, the lid and raceway surface are processed using only pins and screws to position the lid. Later, when the lid is attached again with pins or screws, the lid may be positioned in a different position than when the raceway surface was machined, resulting in misalignment. In the crossed roller bearing of Patent Document 4, the contact surface between the cover and the notch is tapered in the axial direction, and positioning is performed by abutting the bearing ring in the circumferential and radial directions. The part is processed while leaving the abutment surface, or a part other than the lid body is used to form the abutment surface and position it. Since it is necessary to machine in the axial direction, there is room for improvement in terms of workability and reduction in the number of parts. Moreover, in Patent Document 5, as in Patent Document 4, it is necessary to leave a portion in the radial direction for processing, and it is necessary to precisely process the grooves and protrusions of the fitting portion.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems. A recessed and recessed engagement portion is provided, and the lid is fitted to the bearing ring so that the recesses and projections are engaged with each other and positioned and fixed, or the notch portion and the lid are provided with a fan-shaped notch portion in the circumferential direction. By positioning and fixing the lid and the inner ring or the outer ring by fitting the lid to the inner ring or the outer ring, compared to the conventional pin or screw fixing state, it is not affected by the gap due to the tolerance of the parts. Achieving an accurate and reproducible radial positioning fixation of the lid, and combining the uneven shape of the contact surface between the mounting hole and the lid and the fan-shaped shape of the mounting hole and the lid makes it possible to Another object of the present invention is to provide a cross roller bearing that enables more reliable and accurate positioning and fixing.

This invention provides an outer ring having a V-shaped cross-section on its inner peripheral surface and a first raceway surface extending in the circumferential direction and provided with a relief groove in the center; an inner ring extending in the circumferential direction and having a second raceway surface provided with a relief groove in the center and rotatable relative to the outer ring; A plurality of rollers intersecting a raceway formed by the first raceway surface and the second raceway surface through the mounting hole, and closing the mounting hole and forming the raceway in the mounting hole In a crossed roller bearing consisting of a lid with a third raceway surface that
The assembling hole includes a first notch extending radially from either the inner peripheral surface or the outer peripheral surface of the end surface of the inner ring and forming a contact surface with the lower surface of the lid; A second notch portion extending to the other of the inner peripheral surface formed by a notch step portion formed in the middle of one notch portion or in the middle of the side surface of the mounting hole, and the second notch portion extending to the other of the outer peripheral surface;
The lid is fitted into the first notch and the second notch of the mounting hole, and has a convex stepped portion that engages and engages with the notched stepped portion, A cross roller characterized in that movement of the lid in the radial direction is achieved by positioning and fixing the lid by fitting the lid into the mounting hole and engaging the convex stepped portion of the lid with the cutout stepped portion. Regarding bearings. Also, in this cross roller bearing, either one of the first notch and the second notch is deeper in the axial direction or longer in the radial direction than the other.

Alternatively, the present invention provides an outer ring having a first raceway surface with a V-shaped cross-section extending in the circumferential direction on the inner peripheral surface and having a relief groove in the center, and a cross-section on the outer peripheral surface facing the first raceway surface of the outer ring A V-shaped inner ring having a second raceway surface extending in the circumferential direction and provided with a relief groove in the center and rotatable relative to the outer ring; a plurality of rollers intersecting each other in a raceway formed by the first raceway surface and the second raceway surface through the built-in hole; In a crossed roller bearing comprising a lid with a third raceway surface forming
The assembling hole includes a third notch extending radially from one of the inner peripheral surface and the outer peripheral surface of the end surface of the outer ring and forming a contact surface with the lower surface of the lid; 3 A fourth notch portion extending to the other of the inner peripheral surface and the outer peripheral surface formed by a notch step portion formed in the middle of the notch portion or in the middle of the side surface of the mounting hole,
The lid is fitted into the third notch and the fourth notch of the mounting hole, and has a convex stepped portion that engages and engages with the notched stepped portion, A cross roller characterized in that movement of the lid in the radial direction is achieved by positioning and fixing the lid by fitting the lid into the mounting hole and engaging the convex stepped portion of the lid with the cutout stepped portion. Regarding bearings. Also, in this cross roller bearing, either one of the third notch and the fourth notch is deeper in the axial direction or longer in the radial direction than the other.

Alternatively, the present invention provides an outer ring having a first raceway surface with a V-shaped cross section extending in the circumferential direction on the inner peripheral surface and having a relief groove in the center, and a cross-sectional A V-shaped inner ring having a second raceway surface extending in the circumferential direction and provided with a relief groove in the center and rotatable relative to the outer ring; a plurality of rollers intersecting each other in a raceway formed by the first raceway surface and the second raceway surface through the built-in hole; In a crossed roller bearing comprising a lid with a third raceway surface forming
The mounting hole has a tapered side surface extending in a first fan shape, the circumferential length of whichever one of the inner and outer circumferential sides of the inner ring or the outer ring is longer than the other circumferential length. formed by 5 notches,
The lid is formed in a second fan shape that fits into the fifth notch of the mounting hole, and the movement of the lid in the radial direction is controlled by the movement of the second fan shape of the lid in the mounting hole. It relates to a cross roller bearing characterized by being positioned and fixed by fitting into a fifth notch. Further, in the above cross roller bearing, the fifth notch portion forming the mounting hole is formed so as to extend radially from either one of the inner peripheral surface and the outer peripheral surface of the end surface of the inner ring and is formed on the lid. The inner peripheral surface and the outer periphery formed by a first notch forming a contact surface with the lower surface, and a notch step formed in the middle of the first notch or in the middle of the side surface of the mounting hole and a second notch portion extending to the other of the surface and the second notch portion. It is equipped with a part. Alternatively, the fifth cutout portion forming the mounting hole is formed by extending radially from either the inner peripheral surface or the outer peripheral surface of the end surface of the outer ring, and forms a contact surface with the lower surface of the lid. The other of the inner peripheral surface and the outer peripheral surface formed by a third notch portion to be formed and a notch stepped portion formed in the middle of the third notch portion or in the middle of the side surface of the mounting hole and a fourth notch portion extending to the fifth notch portion. is.

Further, in this cross roller bearing, the cover is fitted into the mounting hole and fixed to the inner ring or the outer ring in the axial direction by means of pins or screws.

In the cross roller bearing according to the present invention, as described above, complementary recessed and recessed notched steps are formed in the contact portion between the mounting hole formed in the inner ring or the outer ring, which is a bearing ring, and the lid. By aligning the parts with each other or by forming the mounting hole and the lid in a fan shape, the mounting hole and the lid are accurately positioned and fixed, and in that state, the raceway surface of the lid and the inner or outer ring can be processed. can. Next, after removing the lid from the assembly hole and inserting the rollers into the raceway, when reattaching the lid, the mounting position during processing can be adjusted without being affected by the dimensional differences of the mounting holes, pins, screws, etc. Since it can be reproduced accurately, there is no step on the raceway surface between the inner ring or outer ring and the lid, and no jamming occurs when the rollers roll, improving rotational accuracy and providing a bearing with less noise and abnormal noise. be able to. In addition, since this cross roller bearing can perform accurate positioning without using a positioning pin, it is possible to reduce the number of parts and the cost.

1 is a plan view showing a first embodiment of a cross roller bearing according to the invention; FIG. FIG. 2 is a partial perspective view showing a state in which an assembly hole for loading rollers in a raceway of the cross roller bearing of FIG. 1 is closed with a lid. FIG. 2 is a cross-sectional view showing the cross roller bearing along line segment AA in FIG. 1; 3 is a partial perspective view showing a mounting hole in the cross roller bearing shown in FIG. 2 with a lid removed from the mounting hole; FIG. The area of the built-in hole formed in the inner ring of this cross roller bearing is shown, (a) is a partial plan view showing the state where the cover is removed from the cross roller bearing, and (b) is the line segment BB in (a). It is sectional drawing which shows a state. FIG. 10 is a perspective view showing an example of a lid for closing an installation hole in this cross roller bearing, in which an arc-shaped notch stepped portion is provided on the lower surface of the lid that contacts the contact surface of the installation hole. FIG. 10 is a perspective view showing a second embodiment in which a lid for closing an assembly hole in this cross roller bearing is provided with a straight notch stepped portion on the lower surface of the lid that contacts the contact surface of the assembly hole; FIG. 10 is a cross-sectional view showing a modification of the cross roller bearing in which the installation hole for loading the rollers in the raceway is closed with a lid provided with notched steps extending in different directions; FIG. 5 is a partial perspective view showing another shape of the mounting hole in the cross roller bearing according to the invention; Fig. 10 shows a fan-shaped lid fitted to the mounting hole provided in the inner ring of the cross roller bearing shown in Fig. 9, (a) is a perspective view of the lid in contact with the contact surface of the mounting hole, and (b) is a perspective view from below; 10 is an explanatory view showing a state in which the lid of (a) is fitted into the mounting hole shown in FIG. 9; FIG. FIG. 2 is a perspective view of a fan-shaped cover fitted in a mounting hole provided in the outer ring of the cross roller bearing, and a bottom perspective view of the cover coming into contact with the contact surface of the mounting hole. The cover fitted into the mounting hole in this cross roller bearing is shown, (a) is a fan-shaped cover fitted to the inner ring, and is a perspective view of the cover with a straight notched stepped portion seen from the bottom, ( b) is a fan-shaped lid fitted to the inner ring and has an arc-shaped notch step, viewed from below; (d) is a perspective view of a fan-shaped lid fitted to the outer ring and having an arc-shaped notch step viewed from the bottom. It is a diagram. Fig. 3(a) shows a lid that fits into the mounting hole in this cross roller bearing, and (a) is a fan-shaped lid that fits into the inner ring, the direction of which is restricted by the tapered surface of the side surface and the direction of restriction by the notched stepped portion. and (b) is a fan-shaped lid fitted to the inner ring, which is regulated by the tapered surface on the side face. FIG. 10 is a bottom perspective view of a lid having an arcuate cutout stepped portion in which the direction restricted by the cutout stepped portion is the opposite direction. Fig. 3(a) is a plan view showing an example of a mounting hole provided in the cross roller bearing, in which a locking portion serving as a stepped portion is provided on the side surface of the mounting hole, i.e., the circumferential contact surface; FIG. 8B is a plan view showing another example in which a locking portion, which is a stepped portion, is provided on the side surface of the mounting hole provided in the outer ring, that is, the circumferential contact surface. Fig. 3(a) shows a mounting hole in this cross roller bearing, in which (a) is another embodiment in which the taper-shaped mounting hole provided in the inner ring is provided with a stepped locking portion on the side surface of the mounting hole, i.e., the circumferential contact surface. and (b) is a plan view showing still another embodiment in which a tapered mounting hole provided in the outer ring and a locking portion serving as a stepped portion is provided on the side surface of the mounting hole, that is, the circumferential contact surface It is a diagram.

An embodiment of the cross roller bearing according to the present invention will be described below with reference to the drawings. INDUSTRIAL APPLICABILITY The crossed roller bearing according to the present invention can be applied to the revolving and swinging parts of mechanical devices such as robots such as industrial robots, optical equipment, medical equipment, and machine tools. , can be operated lightly.

First, a first embodiment of a cross roller bearing according to the present invention will be described with reference to FIGS. 1 to 6. FIG. This cross roller bearing is generally composed of an outer ring 1 having a raceway surface 11 (first raceway surface) having a V-shaped cross section on an inner peripheral surface 6 and having a relief groove 15 in the center. An inner ring 2 having a raceway surface 12 (second raceway surface) having a V-shaped cross section and a relief groove 16 in the center on the surface 9 and being rotatable relative to the outer ring 1, provided on an end surface 14 of the inner ring 2 Cylindrical rollers 4 intersect each other in a raceway 10 composed of a raceway surface 11 and a raceway surface 12 through the mounting hole 5, and close the mounting hole 5 and form the raceway 10 in the mounting hole 5. It is composed of a lid 3 having a raceway surface 23 (third raceway surface). The outer ring 1 and the inner ring 2, which are bearing rings, are formed, for example, by grinding a raw material to form outer peripheral surfaces 7 and 9, inner peripheral surfaces 6 and 8 which are inner diameters, and raceway surfaces 11 which are raceway grooves. 12 are formed. In the first embodiment, the mounting holes 5 for mounting the rollers 4 in the raceway 10 are formed by notches 17 and 19 in the inner ring 2 by a working method such as grinding. The notches 17 and 19 reach from the inner peripheral surface 6 of the inner ring 2 to the outer peripheral surface 9 in the radial direction of the cross roller bearing, and the axial depth of the mounting hole 5 is the center of the two raceway surfaces 12 of the inner ring 2. It is formed in a shape reaching up to an escape groove 16 which serves as an escape for grinding the raceway surface provided at the connecting portion of the . When the inner ring 2 and the outer ring 1 are combined, the raceway 10 is formed by four raceway surfaces 11 and 12, and the opening 31 into which the rollers 4 can be loaded or inserted is formed in the notch formed in the inner ring 2. 17 and 19. In this cross roller bearing, the inner ring 2 and the outer ring 1 are combined, then the lid 3 is removed from the inner ring 2, and the rollers 4 are installed in the raceway 10 through the opening 31 of the mounting hole 5 formed by the notch 17. insert Next, the lid 3 is fitted into the mounting hole 5 of the inner ring 2, and finally the screw 27 is inserted into the mounting hole 28 of the lid 3 and screwed into the threaded hole 29 of the inner ring 2. is fixed to the inner ring 2.

This cross roller bearing is particularly concerned with the mounting hole 5 formed in either the outer ring 1 or the inner ring 2, that is, the outer ring 1 or the inner ring 2, and the lid 3 that closes the mounting hole 5, that is, fits into the mounting hole 5. It has characteristics. In the first embodiment, as shown in FIGS. 1 to 5 and 6, assembling holes 5 for assembling the rollers 4 into the raceway 10 are formed in the inner ring 2. FIG. As shown in FIGS. 4 and 5, the mounting hole 5 is formed on the end surface 14 of the inner ring 2 by a notch portion 17 (first notch portion) formed by a flat contact surface 18 extending from the inner peripheral surface 8 to the outer peripheral surface 9. , and a notch portion 19 (second notch portion) reaching the clearance groove 16 of the outer peripheral surface 9 of the inner ring 2 by means of an arcuate notch stepped portion 20 formed in the middle of the notch portion 17 . In other words, the cutouts 17, 19 of the inner ring 2 defining the mounting hole 5 are formed by spaced apart side surfaces 25 extending substantially parallel to the radial direction. In the first embodiment, the axial contact surfaces of the cutouts 17, 19 of the lid 3 and the inner ring 2 generally have a convex step formed on the lid 3 that restricts the radially inward movement of the lid 3. The portion 21 and the notch stepped portion 20 formed in the inner ring 2 are configured to have an uneven shape and engage with each other. The circumferential width of the cutouts 17 and 19 on the raceway surface 12 side is slightly larger than the diameter and length of the rollers 4 so that the rollers 4 can be inserted therein. The lid 3 fitted into the mounting hole 5 to close the mounting hole 5 has a lower surface 22 that contacts the flat contact surface 18 of the mounting hole 5 and a lower surface 22 that engages with the notch stepped portion 20. It is formed on a convex stepped portion 21 projecting from. That is, the lid 3 disposed on the cutouts 17 and 19 of the inner ring 2 is prevented from moving radially inward by engaging the convex stepped portion 21 of the lid 3 with the cutout stepped portion 20 of the inner ring 2 . will be regulated. Furthermore, the recess 19 formed in the inner ring 2 and the convex step 21 formed in the lid 3 extend circumferentially with respect to the flat contact surface 18 . With the above structure, when attaching the lid 3, the convex stepped portion 21 of the lid 3 can be pressed against the cutout stepped portion 20 of the inner ring 2 toward the inner peripheral side so that the screw 27 can be fixed without any gap. can. Therefore, when the rollers 4 are loaded into the raceway 10 from the mounting holes 5, the lid 3 is removed from the inner ring 2, and after the rollers 4 are loaded into the raceway 10, the removed lid 3 is positioned in the mounting hole 5 and reattached. When doing so, the lid 3 can be properly positioned and attached to the mounting hole 5 as it was. Further, even if an external force such as an excessive moment is applied to the cross roller bearing and a large load is applied to the rollers 4, the cover 3 will not shift radially inward.

In addition, the notch 17 of this cross roller bearing is provided with a screw hole 29 for attaching a screw 27 for fixing the lid 3 . The lid 3 is positioned by being fitted into the mounting hole 5, and is fastened by a pin or screw 27 which is inserted through a mounting hole 28 formed in the lid 3 and screwed into a threaded hole 29 formed in the inner ring 2. It is fixed to the inner ring 2. The cover 3 has a lower surface 22 that is a contact surface that matches the shape of the cutouts 17 and 19 and has a raceway surface 23 that is continuous with the raceway surface 12 of the inner ring 2 without steps. The cutouts 17 and 19 are formed by cutting with an end mill or the like, electrical discharge machining, or the like. In order to fix the cover 3 to the inner ring 2 with screws 27 , mounting holes 28 through which the screws 27 are inserted are provided at positions corresponding to the screw holes 29 of the inner ring 2 . The radial width of the lid 3 is slightly larger than the radial width of the inner ring 2 . In addition, the lid 3 is integrated with the inner ring 2 in a state where the lid 3 is fitted to the notches 17 and 19 of the inner ring 2 and fixed with screws 27, and the outer peripheral surface 32 and the raceway surface 23 are subjected to simultaneous finish grinding. ing. Since the lid 3 is formed slightly larger than the mounting hole 5 of the inner ring 2, the portion protruding from the mounting hole 5 is removed in the above process, and the raceway surface 12 of the lid 3 and the inner ring 2 and the outer shape are continuous. It is formed without steps.

Further, in the cross roller bearing according to the present invention, the embodiment in which the inner ring 2 is formed with the mounting hole 5 has been described above, but although not shown, the same effect can be obtained by forming the mounting hole 5 in the outer ring 1. effect can be obtained. As for the case where the mounting hole 5 is formed in the outer ring 1, . An outline is explained. That is, in the embodiment in which the outer ring 1 of the cross roller bearing is formed with the mounting hole 5, the mounting hole 5 generally consists of a flat contact surface extending from the inner peripheral surface 6 to the outer peripheral surface 7 on the end face 39 of the outer ring 1. A notch portion (third notch portion) and a notch portion (fourth notch portion) reaching the escape groove 15 of the inner peripheral surface 6 of the outer ring 1 by means of an arc-shaped notch step portion formed in the middle of the notch portion. notch). In other words, both cutouts of the outer ring 1 forming the mounting hole 5 are formed by spaced apart side surfaces 25 extending substantially parallel to the radial direction. In this embodiment, the axial contact surfaces of the cutouts of the lid 3 and the outer ring 1 generally include a convex stepped portion formed on the lid 3 that restricts the outward movement of the lid 3 in the radial direction. It is configured to be engaged with the cutout stepped portion formed on the outer ring 1 in an uneven shape.

Next, FIG. 7 shows a second embodiment of the lid 3 applied to this cross roller bearing. The lid 3A of the second embodiment extends straight in the width direction of the lid 3A, whereas the convex stepped portion 21 of the lid 3 of the first embodiment is formed in an arc shape in the width direction. . The second embodiment has substantially the same construction as the first embodiment, except that an assembly hole (not shown) formed in the inner ring 2 is formed in a shape corresponding to the lid 3A. . In the second embodiment, the mounting hole (not shown) formed in the inner ring 2 is shaped so that the lid 3A is fitted therein, i.e., the notched stepped portion formed in the inner ring 2 extends straight. It goes without saying that

FIG. 8 shows a modification in which the shape of the mounting hole 5 formed in the inner ring 2 applied to this cross roller bearing and the cover 3 are different from those in FIG. The notch portions 36 and 37 formed in the inner ring 2 shown in FIG. , and a notch 36 is formed deeper than the notch 37 . In this embodiment, the force applied to the cutout stepped portion 35 between the mounting hole 5 of the inner ring 2 and the lid 3 is configured to restrict the outward movement in the radial direction. Therefore, even if the inner ring 2 rotates, the cover 3 is locked by the notch stepped portion 35 and is restricted from popping out to the raceway 10 due to the centrifugal force. In this embodiment, for example, when the cross roller bearing is manufactured, with the cover 3 attached to the inner ring 2, the raceway surface 12 of the inner ring 2 and the raceway surface 23 of the cover 3 are integrated and simultaneously ground. , the lid 3 is removed from the inner ring 2, a plurality of rollers 4 are inserted through the mounting holes 5, and after the rollers 4 are loaded, the lid 3 is again fitted into the mounting holes 5 of the inner ring 2. The cover 3 can be accurately fitted into the assembly hole 5 of the inner ring 2 by pressing it against the step of the notch stepped portion 35 on the boundary with the notch portion 37 to position it and fixing it with screws 27. .

Next, a third embodiment of the cross roller bearing according to the present invention will be described with reference to FIGS. 9 and 10. FIG. The cross roller bearing of the third embodiment differs from that of the first embodiment in that the shape of the mounting hole 5A and the lid are formed in a fan shape. FIG. 10 shows a lid 3B fitted into the mounting hole 5A in the cross roller bearing according to the invention. The mounting hole 5A is formed in the inner ring 2. As shown in FIG. The mounting hole 5A is formed in a tapered surface 13 having a sector shape (first sector shape) in which the outer peripheral side of the inner ring 2 has a longer width in the circumferential direction than the inner peripheral side. The tapered surface 13 is formed such that the opposite side surface 25 is tapered from the outer peripheral side to the inner peripheral side, and the tapered surface 30 of the opposite side surface 24 of the lid 3B is aligned with the tapered surface 13 of the mounting hole 5A. It is Further, the lid 3B is formed with a fan-shaped (second fan-shaped) tapered surface 30 whose outer peripheral side is wider than its inner peripheral side in accordance with the shape of the mounting hole 5A. Further, the side surface 24 (tapered surface 30) of the lid 3B and the side surface 25 (tapered surface 13) of the mounting hole 5A form surfaces that contact each other, and the tapered surface 13 that expands to each other forms the cutting surface of the mounting hole 5A. A notch 17T (fifth notch) is formed. In other words, since the circumferential width of the outer peripheral surface 9 of the mounting hole 5A is larger than the circumferential width of the inner peripheral surface 8 and is formed in a fan shape, the radially inward direction in which the circumferential width is narrower. The movement of the lid 3B is restricted, and the tapered surface 30 of the lid 3B and the tapered surface 13 of the mounting hole 5A are engaged to form a locking portion, which achieves the same effect as in the first embodiment. Further, when a load is applied radially inward to the lid 3B, the side surface 25, which is the tapered surface 13, can receive the load. In the third embodiment, the side surface 25 of the mounting hole 5A, which is the tapered surface 13, is formed in a sector shape in which the circumferential width of the outer circumference of the inner ring 2 is larger than the width of the inner circumference thereof. is formed into a fan shape by fitting into the fan shape of the mounting hole 5A, and by fitting the lid 3B into the mounting hole 5A of the inner ring 2, the locking portions 34 are formed in both fan shapes, and the inner ring 2, the lid 3B is positioned and fixed.

A lid 3C shown in FIG. 11 is fitted into an assembly hole formed in the outer ring 1, although not shown. A lid 3C shown in FIG. 11 is a lid 3C that closes an assembly hole (not shown) provided in the outer ring 1, and a tapered surface 30 is formed with a side surface 24 extending substantially in the radial direction. Further, the lower surface 22 of the lid 3C is entirely flat. The side surface 24 of the lid 3C is formed into a tapered surface 30 in which the inner peripheral surface 33 is larger in the circumferential direction than the outer peripheral surface 32. Therefore, even if a load is applied by the rollers 4 of the rolling elements, the outer ring 1 is positioned and fixed, and no step is generated at the boundary between the raceway surface 11 of the outer ring 1 and the raceway surface 23 of the lid 3C. The noise caused by the step can be suppressed by the rollers 4 rolling on the rollers 11 and 23.例文帳に追加

Further, regarding this cross roller bearing, as shown in FIGS. It is possible to simultaneously provide radial positioning by a step between the lower surface 22 of the 3G and the notch (not shown) of the inner ring 2 or the outer ring 1 . Although not shown, the mounting hole is formed by a notch portion extending from the inner peripheral surface of the end surface 14 of the inner ring 2 or the end surface of the outer ring 1 to the outer peripheral surface, which serves as a contact surface, and formed in the middle of the notch portion. The lids 3D to 3G are formed by notches formed by extending from the cutout stepped portion to the outer peripheral surface. Of course, it is formed so as to have a convex stepped portion that fits together. The lids 3D and 3E are used for the mounting holes formed in the inner ring 2, and the lids 3F and 3G are used for the mounting holes formed in the outer ring 1. The lids 3D, 3E applied to the inner ring 2 and the lids 3F, 3G applied to the outer ring 1 have fan-shaped shapes extending in opposite directions, so that even if a load is applied by the rollers 4 rolling on the raceway 10, the locking portion can be secured. It will be positioned and fixed in the mounting hole by 34 . A lid 3D shown in FIG. 12A has a tapered surface 30 formed with a side surface 24 extending substantially in the radial direction. Specifically, for the lower surface 22 of the lid 3D, the flat notch stepped portion 20 is formed with a straight stepped convex stepped portion 21 . The lid 3E shown in FIG. 12(b) has a tapered surface 30 formed with a side surface 24 extending in a substantially radial direction. A convex stepped portion 21 is formed in a stepped shape. A lid 3F shown in FIG. 12(c) is a lid that closes an assembly hole provided in the outer ring 1, and a tapered surface 30 is formed with a side surface 25 extending substantially in the radial direction. Further, as for the lower surface 22 of the lid 3F, the flat notch stepped portion 20 is formed with a convex stepped portion 21 having a straight stepped shape. A lid 3G shown in FIG. 12(d) is a lid that closes an assembly hole (not shown) provided in the outer ring 1, and a side surface 24 extending substantially radially is formed on the tapered surface 30. As shown in FIG. Further, on the lower surface 22 of the lid 3G, the flat notch stepped portion 20 is formed with a convex stepped portion 21 having an arcuate stepped shape.

Regarding the lids 3D to 3G shown in FIGS. 12(a) to 12(d), as described above, the positioning of the tapered surface 30 of the side surface 24 extending in the radial direction, and the alignment of the lower surface 22 of the lids 3D to 3G and the mounting hole. The lids 3D to 3G can be accurately and reliably positioned in the mounting holes by positioning the cutouts and the steps, and the locking portion 34 can effectively perform its function. That is, when the inner ring 2 is formed with a mounting hole, the radially inward movement of the lids 3D to 3G is restricted by opening the fan shape outward in the radial direction. When formed, the radially outward movement of the lids 3D to 3G is regulated by opening the fan shape inward in the radial direction. Furthermore, the step of the contact surface between the lids 3D to 3G and the notch of the mounting hole of the inner ring 2 or the outer ring 1 is such that when the mounting hole is formed in the inner ring 2, the notch is shallow inward in the radial direction and the radius When the outer ring 1 is formed with a mounting hole, the radially inner side is deepened and the radially outer side is shallowed to restrict radially inner movement. It is designed to restrict movement to Furthermore, the movement of the inner ring 2 in the direction of the end face 14 or the end face direction of the outer ring 1 is accomplished by screwing a screw 27 or the like into the mounting hole 28 formed in the lids 3D to 3G and screwing it into the inner ring 2 or the outer ring 1. It can be constrained by a slanted surface and allows accurate and reliable positioning in both radial, circumferential and axial directions.

Lids 3H and 3J shown in FIGS. 13A and 13B are modifications of the lids 3D and 3E shown in FIGS. 12A and 12B. A tapered surface 30 extending from the inside to the outside extends in the opposite direction. 13(a) is compared with the lid 3D shown in FIG. 12(a), the side surface 24 extending in the substantially radial direction is tapered in the direction opposite to the tapered surface 30 in FIG. 12(a). It is formed on surface 30 . Further, on the lower surface 22 of the lid 3H, the flat notch stepped portion 20 is formed with a convex stepped portion 21 having a straight stepped shape. Accordingly, the lid 3H is positioned and fixed in both radially inward and radially outward directions. Similarly, in the lid 3J shown in FIG. 13(b), compared with the lid 3E shown in FIG. 12(b), the side surface 24 extending substantially in the radial direction extends in the direction opposite to the tapered surface 30 in FIG. 12(b). It is formed on the tapered surface 30 . Further, as for the lower surface 22 of the lid 3J, the flat notch stepped portion 20 is formed with a convex stepped portion 21 having an arcuate stepped shape. Accordingly, the lid 3J is positioned and fixed in both radially inward and radially outward directions.

Next, another embodiment of the mounting holes 5B and 5C formed in the inner ring 2 and the outer ring 1 constituting the cross roller bearing according to the present invention will be described with reference to FIGS. In this cross roller bearing, the steps between the contact surfaces of the cover 3 and the mounting holes 5B and 5C are not only provided on the contact surfaces in the axial direction as in the above embodiment, but also shown in FIGS. As shown in FIG. 1, the notch portions 17 (first notch portions) formed in the mounting holes 5B and 5C formed in the inner ring 2 or the outer ring 1 are provided with notch steps on the circumferential contact surfaces, that is, the side surfaces 25 and 26. A section 34 may also be provided. The lid 3 is formed with locking portions that are complementary convex stepped portions corresponding to the locking portions 34 formed on the side surfaces 25 and 26 of the notch portion 17 formed in the mounting holes 5B and 5C. Of course, the locking portions 34 are engaged with each other to position and fix the lid 3 in the radial direction. The mounting hole 5B shown in FIG. 14(a) is formed in the inner ring 2, and a locking portion 34, which is a stepped portion, is provided on the circumferential contact surface, which is the side surface 25 of the mounting hole 5B. In the hole 5B, one side surface 25 of the inner ring 2 extends substantially straight in the radial direction, and the other side surface 25 extends straight with a stepped portion formed with a locking portion 34 in the middle, and the opposing side surfaces 25 extend parallel to each other. ing. The mounting hole 5C shown in FIG. 14(b) is formed in the outer ring 1, and the locking portion 34, which is a stepped portion, is provided on the circumferential contact surface, which is the side surface 26 of the mounting hole 5C. . The cutout portion 17 formed in the mounting hole 5C has one side surface 26 of the outer ring 1 extending straight in the substantially radial direction, and the other side surface having a stepped portion in which the locking portion 34 is formed. The flanks 26 run parallel to each other.

Next, referring to FIGS. 15(a) and 15(b), the mounting holes 5D and 5E formed in the inner ring 2 and the outer ring 1 constituting the cross roller bearing according to the present invention are formed in the inner ring 2 or the outer ring 1. A locking portion 34, which is a stepped portion, is provided on the circumferential contact surfaces, ie, side surfaces 25 and 26, which are the side surfaces 25 of the mounting holes 5D and 5E. The mounting hole 5D shown in FIG. 15(a) is formed by forming a cutout portion 17T in the inner ring 2, and the locking portion 34, which is a stepped portion, is formed on the side surface 25 of the cutout portion 17T of the mounting hole 5B. A cutout portion 17 is provided on the directional contact surface and formed in the mounting hole 5D. It extends to the tapered surface 13 with a stepped portion, and the opposing side surfaces 25 extend to diverge from each other. The mounting hole 5E shown in FIG. 15(b) is formed in the outer ring 1, and the locking portion 34, which is a stepped portion, is provided on the circumferential contact surface, which is the side surface 26 of the mounting hole 5E. . One side surface 26 of the outer ring 1 extends substantially radially to the tapered surface 13, and the other side surface 26 extends to the tapered surface 13 with a stepped portion in which a locking portion 34 is formed. extend to diverge from each other.

The cross roller bearing according to the present invention can be used in the rotating parts of various devices such as industrial robots, measuring and inspection equipment, medical equipment, optical equipment, etc., which have rotating parts such as joints, rotating parts, and swinging parts that receive complex loads. It is preferable to incorporate and use.

1 outer ring 2 inner ring 3, 3A to 3H, 3J to 3N lid 4 rollers 5, 5A to 5E mounting hole 6, 8, 33 inner peripheral surface 7, 9, 32 outer peripheral surface 10 raceway 11 raceway surface (first raceway surface)
12 raceway surface (second raceway surface)
13, 30 tapered surface 14, 39 end surface 15, 16 escape groove 17, 17T, 19, 36, 37 notch portion 18 contact surface 20, 35 notch step portion 21 convex step portion 22 lower surface 23 raceway surface (third raceway surface) surface)
24, 25 Side 27 Screw

Claims (5)

An outer ring having a V-shaped cross-section extending in the circumferential direction on an inner peripheral surface and having a first raceway surface provided with a relief groove in the center; an inner ring that extends and has a second raceway surface with a relief groove in the center and is relatively rotatable with respect to the outer ring; a plurality of rollers intersecting a raceway formed by the surface and the second raceway surface ; and a third raceway surface that closes the mounting hole and forms the raceway in the mounting hole. In a crossed roller bearing consisting of a lid ,
The mounting hole includes a first notch formed by extending radially from either one of the inner peripheral surface and the outer peripheral surface of the inner ring and forming a contact surface with the lower surface of the lid , and the first notch. a second notch portion extending to the other of the inner peripheral surface formed by a notch step portion formed in the middle of the part or in the middle of the side surface of the mounting hole and the outer peripheral surface ;
The lid is fitted into the first cutout portion and the second cutout portion of the mounting hole , is engaged with the cutout stepped portion , and is engaged with the cutout stepped portion. It has a convex stepped portion whose movement inward in the radial direction is restricted by the
The movement of the lid in the radial direction is achieved by positioning and fixing the lid by fitting the lid into the mounting hole and engaging the convex step portion of the lid with the notch step portion. roller bearing. 2. A cross roller bearing according to claim 1, wherein one of said first notch and said second notch is deeper in said axial direction or longer in said radial direction than the other. An outer ring having a V-shaped cross-section extending in the circumferential direction on an inner peripheral surface and having a first raceway surface provided with a relief groove in the center; An inner ring that extends and has a second raceway surface with a relief groove in the center and is relatively rotatable with respect to the outer ring; a plurality of rollers intersecting a raceway formed by the surface and the second raceway surface ; and a third raceway surface that closes the mounting hole and forms the raceway in the mounting hole. In a crossed roller bearing consisting of a lid ,
a third notch extending radially from either one of the inner peripheral surface and the outer peripheral surface of the outer ring and forming a contact surface with the lower surface of the lid ; and a fourth notch portion extending to the other of the inner peripheral surface formed by a notch step portion formed in the middle of the part or in the middle of the side surface of the mounting hole and the outer peripheral surface ,
The lid is fitted into the third notch and the fourth notch of the mounting hole , is engaged with the notch stepped portion , and is engaged with the notch stepped portion . has a convex step whose radially outward movement is restricted by
The movement of the lid in the radial direction is achieved by positioning and fixing the lid by fitting the lid into the mounting hole and engaging the convex step portion of the lid with the notch step portion. roller bearing. 4. A cross roller bearing according to claim 3, wherein one of said third notch and said fourth notch is deeper in said axial direction or longer in said radial direction than the other. The cross roller bearing according to any one of claims 1 to 4 , characterized in that the lid fitted into the mounting hole is fixed to the inner ring or the outer ring in the axial direction with pins or screws. .

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