JPS62292920A - Swing bearing and its process - Google Patents

Abstract

PURPOSE:To maintain high accuracy of a swing bearing and to simplify the manufacturing process, by engraving a notch line on the peripheral surface of one of the outer and inner races, along the groove bottom line of a V-groove and also along the circumferential direction of the race, breaking the race at the notch line by means of external force, incorporating the rollers in the groove of the race, and then rejoining the broken race to the initial shape. CONSTITUTION:A notch line 11 is engraved on a parting line, which divides an outer race 1 in the circumferential direction of the peripheral surface, along a groove bottom line 3c of the outer race 1, on which an inward V-groove 3 as a rolling/running surface for a roller 7 is formed. Next, the outer race is broken by using a wedge-shaped jig whose angle is larger than the bevel angle of the V-groove 3. The rollers 7 and a spacer retainer 13 are interposed between this outer race member 1a or 1b on one side and an inner race 4, while the ends of the outer race 1a or 1b on the other side are joined by using a rivet 9c, after their mating surfaces 8a or 8b are brought into one plane. Accordingly, a discrepancy between the rolling/running surface and the peripheral surface of the rollers 7 can be eliminated, thereby maintaining high accuracy and simplifying the manufacturing process.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] This invention relates to a swing bearing that is frequently used in the swing parts of industrial robots, joint parts, manipulator rotating parts, medical equipment, etc. Regarding.

[Prior Art] Conventionally, as shown in FIG. 8, this type of slewing bearing has an inward seven-shaped groove 3 that opens inward along the circumferential direction of the inner circumferential surface 2 of the outer ring 1. At the same time, an outward V-shaped groove 6 is formed along the circumferential direction of the outer peripheral surface 5 of the inner ring 4 to face the inward seven-shaped groove 3, and the outer ring 1 is aligned with the groove bottom line 3C of the inward seven-shaped groove 3. It consists of a pair of outer ring members 1a and 1b divided along
A roller 7 such as a cylindrical roller or a spherical roller or a spacer retainer (not shown) is interposed between the groove 6 and one of the outer ring members 1a or 1b, and then these inner rings 4 and one of the outer ring members 1a are interposed.
Or, by interposing the other outer ring member 1b or 1a between the pair of outer ring members 1a and 1b, the mating surface 8a
and 8b, and these are connected by a bolt 9a and a nut 9b.

[Problems to be Solved by the Invention] However, in such a conventional swing bearing, since the pair of outer ring members 1a and 1b constituting the outer ring 1 are each processed separately, the mating surfaces to be joined during assembly are 8a and 8b must be machined separately, and it is extremely difficult to machine these separately machined mating surfaces 8a and 8b with high precision so that they completely match.
Even if it were possible, it would require extremely high processing costs.

Furthermore, since the rolling surfaces 3a and 3b constituting the inward 7-shaped groove 3 on which the roller 7 rolls are processed with the mating surfaces 8a and 8b temporarily assembled, the mating surfaces 8a and Unless 8b is finished with high precision, the rolling surfaces 3a and 3b cannot be machined with high precision, and the turning movement between the inner and outer rings 1 and 4 performed via the rollers 7 cannot be made smooth and accurate. There was a problem.

Moreover, even if the mating surfaces 8a and 8b and the rolling surfaces 3a and 3b forming the inward 7-shaped groove 3 are machined with high precision,
Bolt 9a connecting the pair of outer ring members 1a and 1b
Since there is a gap between the bolt 9a and the bolt hole 10 through which the bolt 9a passes, even a slight loosening between the bolt 9a and the nut 9b will cause a misalignment between the pair of outer ring members 1a and 1b, causing the outer periphery to Misalignment occurs between the surface and the raceway surfaces 3a and 3b constituting the inward 7-shaped groove 3 and between each raceway surface 3a and 3b, and as a result, it is difficult to maintain high precision and smooth turning movement is hindered. There was a problem that

Furthermore, in the past, as a manufacturing method for this swing bearing, (1) a pair of outer ring members 1a and 1 constituting the outer ring 1;
Rough machining of b, ■Hardening and tempering of outer ring members 1a and 1b, ■Grinding of mating surfaces 8a and 8b, ■Mating surface 8a
and 8b, and bolts 9 to both outer ring members 1a and 1b.
Temporarily assemble with a and nut 9b, grind the outer circumferential surface of outer ring 1, and make an inward V-shape in the temporarily assembled state? Grinding of the raceway surfaces 8a and 8b constituting i'43, (1) Remove the bolts 9a and nuts 9b used for temporary assembly, and grind the inner peripheral surface and Incorporating a roller 7 and a spacer retainer (not shown) between the inner ring 4 whose rolling surfaces 6a and 6b constituting the outward V-shaped groove 6 are ground; Many manufacturing steps are required, including fitting the other outer ring member 1b or 1a between the inner ring 4 and connecting the pair of outer ring members 1a and 1b with bolts 9a and nuts 9b. When grinding the outer circumferential surface, side surface, and raceway surfaces 8a and 8b of the outer ring 1, the pair of outer ring members 1a and 1b become misaligned with each other, making it difficult to perform highly accurate grinding. There was a problem.

[Means for Solving the Problems] The present invention was devised in view of this point of view, and regardless of whether or not it is divided into a pair of ring members, the inner and outer rings,
In particular, it is possible to machine the raceway surfaces that make up the figure 7 groove with high precision, and to prevent the pair of ring members from slipping during use, there will be gaps between the circumferential surface and the figure 7 groove, and each raceway that makes up the figure 7 groove. The object of the present invention is to provide a slewing bearing that does not cause misalignment between running surfaces, and also to provide a method for manufacturing such a slewing bearing.

That is, the first invention forms an inward 7-shaped groove that opens inward along the circumferential direction of the inner circumferential surface of the outer ring, and also forms an inward 7-shaped groove that opens inward along the circumferential direction of the outer circumferential surface of the inner ring. An outward V-shaped groove is formed facing the groove, and one of the inner and outer rings is divided along the groove bottom line of the V-shaped groove to form a pair of ring members having mating surfaces that are joined during assembly. In the swing bearing, in which a roller is interposed between the inner and outer V-shaped grooves, the pair of ring members are joined at their mating surfaces, and the two ring members are connected by a connecting member. The second invention is a slewing bearing comprising a fractured surface that is fractured along a notch line carved along a circumferential dividing line of either the inner or outer ring; forming an inward 7-shaped groove that opens inward along the circumferential direction of the surface, and an outward 7-shaped groove that faces the inward 7-shaped groove along the circumferential direction of the outer peripheral surface of the inner ring, When manufacturing a swing bearing in which a roller is interposed between the inner and outer V-shaped grooves, one of the inner and outer rings divided along the groove bottom line of the V-shaped groove is A notch line running on the parting line is carved along the direction, an external force is applied to this notch line to break it along this notch line, and a roller is interposed between one of the resulting ring members and either the inner or outer ring. At the same time, the other ring member is fitted between the one ring member and either the inner or outer ring, and the mating surfaces of the pair of ring members consisting of the fractured surfaces formed by the above-mentioned fracture are aligned, and these 1 of the slewing bearing, which consists of connecting a pair of ring members with a connecting member! It is a construction method.

In the slewing bearing of the present invention, the pair of ring members may be divided into an outer ring or an inner ring,
Further, the connecting member for connecting the pair of ring members during assembly may be any member that can firmly connect the pair of ring members, such as bolts and nuts, rivets, etc.

In addition, in the method of the present invention, the means for applying an external force to the carved notch line and dividing it into a pair of ring members along the notch line includes applying a shear stress and a tensile force along the notch line that is the dividing line. For example, by applying a wedge-shaped jig with an obtuse angle than the expansion angle of the V-shaped groove to the inward 7-shaped groove or the outward 7-shaped groove formed on the inner peripheral surface of the outer ring or the outer peripheral surface of the inner ring. It is preferable to apply an impact force from the opposite side of the wedge-shaped jig using a means such as a press.

In addition, in the slewing bearing of the present invention and its manufacturing method, in order to prevent the skew of the rollers installed between the inner and outer rings, it goes without saying that the spacer retainer 1 and other roller retainers are installed between the inner and outer rings. .

[Function] According to the slewing bearing of the present invention, the mating surfaces formed on the pair of ring members are not ground surfaces that are finished by cutting and then grinding, but are fractured surfaces formed by fracturing. The mating surfaces formed on the ring members are uneven surfaces that can perfectly match each other, and if these mating surfaces are matched during assembly and joined with the connecting member, the connection will be strong, and there will be no misalignment between the pair of ring members. There is no occurrence of misalignment between the rolling surface and the circumferential surface of the rollers constituting the V-shaped groove, or between the respective rolling surfaces.

Further, according to the method for manufacturing a swing bearing of the present invention, by grinding the raceway surfaces that constitute the V-shaped groove before dividing into a pair of ring members, each of these raceway surfaces can be processed with high precision. In addition, there is no need to temporarily assemble the grinding process as in the conventional method, and the mating surfaces made up of fractured surfaces match each other perfectly, so it is possible to achieve high precision on the mating surfaces as in the conventional method. There is no need to perform grinding, which simplifies the manufacturing process.

[Examples] The present invention will be specifically described below based on examples shown in the accompanying drawings.

1 and 2, a slewing bearing according to an embodiment of the invention is shown. This swing bearing forms an inward 7-shaped groove 3 that opens inward along the circumferential direction of the inner circumferential surface 2 of the outer ring 1, and an inward 7-shaped groove 3 that opens inward along the circumferential direction of the outer circumferential surface 5 of the inner ring 4. An outer ring 1 is formed with an outward 7-shaped groove 6 facing opposite to the 7-shaped groove 3, and the outer ring 1 is divided along the groove bottom line 3c of the inward 7-shaped groove 3, and a mating surface 8a is joined at the time of assembly.
and 8b, and after interposing the roller 7 between the upward oriented outward V-shaped grooves 3 and 60, the mating surfaces 8a and 8b are formed between the pair of outer ring members 1a and 1b. 8b and connected with rivets 9, the mating surfaces 8a and 8b of the pair of outer ring members 1a and 1b are broken along a notch line 11 carved along the circumferential dividing line of the outer ring 1. It consists of a broken surface.

In this embodiment, the rollers 7 installed between the outer ring 1 and the inner ring 4 are provided with a spacer retainer 1 for preventing skew of these rollers 7, as shown in FIG.
It is included with 3. Further, the pair of outer ring members 1
A rivet hole 10a is drilled through each of a and 1b from one side to the other, and by driving a rivet 9C into this rivet hole 0a and caulking the caulked portion, these pair of outer ring members 1a and 1b are connected.

Next, regarding the manufacturing method of the slewing bearing of this embodiment, as shown in FIGS. A notch line 11 is carved along the groove bottom line 3C of the inward V-shaped groove 3 and the parting line dividing the outer ring 1 along the circumferential direction of the outer circumferential surface. and raceway surfaces 3a and 3b forming the inward V-shaped groove 3.
1) Apply a tree-shaped jig 12 with a larger angle than the expansion angle of the inward V-groove 3 to the inward V-groove 3 side, apply an external force F from the outer circumference side, and grind the notch line 1.
1, one of the obtained outer ring members 1a or 1
A roller 7 and a spacer retainer 13 are interposed between b and the inner ring 4, and the other outer ring member 1b or 1a is fitted between the one outer ring member 1a or 1b and the inner ring and formed by the above-mentioned breaking. The mating surfaces 8a and 8b of the pair of outer ring members 1a and 1b made of the fractured surfaces are made to coincide with each other, and the pair of outer ring members 1a and 1b are joined together with a rivet 9C.

Moreover, FIG. 7 shows a part of the inner ring of a swing bearing according to another embodiment of the present invention, and unlike the case of the above embodiment, the inner ring 4 is divided into a pair of inner ring members 4a and 4b,
Furthermore, the rivet 9C used as a joining member for the pair of inner ring members 4a and 4b is also connected by crimping its both ends (caulked portions) on both sides of the inner ring members 4a and 4b. Of course, the method for manufacturing a swing bearing using the inner ring 4 shown in FIG. 7 can be carried out in the same manner as in the above embodiment.

[Effects of the Invention] According to the swing bearing of the present invention, the mating surfaces formed on the pair of ring members are fractured surfaces formed by fracture,
Since this mating surface is a convex and convex surface that perfectly matches the bevel, after assembly, there may be a misalignment between the pair of ring members on these mating surfaces and the rolling surface of the roller forming the figure 7 groove. There is no deviation between the curved surface and each rolling surface, and high accuracy can be maintained between these surfaces.

Furthermore, according to the method for manufacturing a slewing bearing of the present invention, each raceway surface constituting the figure 7 groove is ground with zero grinding force before being divided into a pair of ring members, so that each raceway surface can be polished with high precision. In addition, there is no need to perform temporary assembly as in the conventional method for this grinding process, and since the mating surfaces made up of fractured surfaces perfectly match each other, the accuracy is reproducible after assembly. Furthermore, since there is no need to perform high-precision grinding on the mating surfaces as in the conventional method, the manufacturing process can be simplified accordingly.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a swing bearing according to an embodiment of the present invention, FIG. 2 is an enlarged sectional view, a partial inner side view, and a partial outer side view of the outer ring of FIG. 1 to show details; FIG. 3 is a perspective view showing the relationship between the rollers and the spacer retainer that are incorporated between the inner and outer rings, and FIGS. FIG. 7 is a partial sectional view showing an inner ring of a swing bearing according to another embodiment, and FIG. 8 is a partial vfT view showing a conventional swing bearing. Explanation of symbols (1)...outer ring, (la) (lb)...
Outer ring member, (2)... Inner peripheral surface of outer ring, (3)... Inward V-shaped groove, (3a) (3b)... Rolling surface, (3C)
... Groove bottom line, (4) ... Inner ring, (4a
) (4b)...Inner ring member, [5)...Outer peripheral surface of inner ring, (6)...Outward V-shaped groove, (6a) (6b)...
・Rolling surface, (7)...roller (8a) (8b)・
...Mating surface, (9a)...Bolt, (9b)...
Natsuto, [9c)...Rivet, (11)・
...Notsuchi Line.

Claims (2)

[Claims] (1) Forming an inward V-shaped groove that opens inward along the circumferential direction on the inner circumferential surface of the outer ring, and forming an outward facing V-shaped groove that opens inwardly along the circumferential direction on the outer circumferential surface of the inner ring. A V-shaped groove is formed, and one of the inner and outer rings is divided along the groove bottom line of the V-shaped groove to form a pair of ring members having mating surfaces to be joined during assembly, In a slewing bearing in which a roller is interposed between the grooves, the mating surfaces of the pair of ring members are joined together by a connecting member, and the mating surfaces of the pair of ring members are connected to either the inner or outer ring A slewing bearing characterized in that it is constructed with a fractured surface that is fractured along a notch line carved along the circumferential dividing line. (2) Forming an inward V-shaped groove that opens inward along the circumferential direction on the inner circumferential surface of the outer ring, and forming an outward facing V-shaped groove that opens inward along the circumferential direction on the outer circumferential surface of the inner ring. When manufacturing a swing bearing in which a V-shaped groove is formed and a roller is interposed between the inner and outer V-shaped grooves, one of the inner and outer rings divided along the bottom line of the V-shaped groove is A notch line running on the parting line is carved along the circumferential direction of the circumferential surface, and an external force is applied to this notch line to break it along this notch line. A pair of rings consisting of a fractured surface formed by the above-mentioned fracture, with a roller interposed between the one ring member and the other, and the other ring member fitted between the other ring member and either the inner or outer ring. A method for manufacturing a slewing bearing, characterized in that the mating surfaces of the members are aligned and a pair of ring members is connected by a connecting member.