JP5579988B2 - Spherical machine element - Google Patents

Description

  The present invention relates to a spherical mechanical element such as a spherical bearing, a rod end, a ball joint, and a pillow ball that allows an outer package and an insert inserted therein to come into spherical contact to allow the insert to swing relative to the outer package.

  A spherical bearing is known as a bearing that allows the inner ring to swing with respect to the outer ring. As shown in FIG. 30, the spherical bearing 51 includes an inner ring 52 having a spherical portion 52a having a predetermined radius on the outer peripheral surface, and an outer ring 53 having a spherical concave portion 53a corresponding to the spherical portion 52a of the inner ring 52 on the inner peripheral surface. And. The contact surface between the inner ring 52 and the outer ring 53 is a spherical surface, and the center of the spherical surface portion 52a of the inner ring 52 and the center P of the spherical recess 53a of the outer ring 53 coincide. The inner ring 52 can rotate relative to the outer ring 53 while sliding around the XYZ coordinate axes with the center P as the origin. The shaft 54 fitted to the inner ring 52 can swing around the center P within the range of the allowable inclination angle α.

  As the spherical mechanical element, there is a rod end 58 as shown in FIG. 31 in addition to the spherical bearing. The rod end 58 includes an inner ring 55 having a spherical portion 55 a having a predetermined radius on the outer peripheral surface, an outer ring 56 having a spherical concave portion 56 a corresponding to the spherical portion 55 a of the inner ring 55, and a holder for holding the outer ring 56. 57. In the rod end 58, a holder 57 is formed integrally with the outer ring 56. In addition to the rod end 58, a ball joint 59 as shown in FIG. 32 is also known. The ball joint 59 is also called a link ball (registered trademark), and includes a ball-shaped shank 62 in which a shank portion 61 is welded to a spherical portion 60 and a holder 63 in which the spherical portion 60 is wrapped by die casting.

  As shown in FIG. 30, the spherical bearing 51 not only allows the inner ring 52 to swing, but can also apply a radial load (1) acting in the radial direction on the axis of the inner ring 52. This is because when the radial load (1) is applied, a contact area between the inner ring 52 and the outer ring 53 can be secured. On the other hand, the spherical bearing 51 cannot load the thrust load (2) acting in the axial direction of the inner ring 52 as much as the radial load (1). This is because when the thrust load (2) is applied, the inner ring 52 protrudes from the end of the outer ring 53 in the axial direction, and the contact area between the inner ring 52 and the outer ring 53 cannot be secured. Not only the spherical bearing 51 but also the rod end 58 and the ball joint 59 cannot apply a thrust load as much as a radial load.

Patent Document 1 discloses a spherical bearing that can solve this problem and can apply not only a radial load but also a thrust load. As shown in FIG. 33, in this spherical bearing 65, the outer ring 66 is divided into three in the axial direction. The central segment 66a receives a radial load, and the segments 66b and 66c on both sides receive a thrust load.
JP 2002-327737 A (refer to page 1, FIG. 1)

  However, in the spherical bearing described in Patent Document 1, in order to increase the thrust load that can be applied, it is necessary to increase the radius of the spherical portion of the inner ring and increase the area of the outer ring covering the inner ring. This is because if the length of the outer ring in the axial direction is increased while the radius of the spherical portion of the inner ring is constant and the area of the outer ring covering the inner ring is increased, the swing angle of the inner ring is limited. Of course, when the radius of the spherical portion of the inner ring is increased, the outer diameter of the spherical bearing is increased.

  Accordingly, an object of the present invention is to provide a spherical machine element capable of adjusting a radial load and a thrust load that can be loaded while keeping the size of the spherical machine element compact, and a manufacturing method thereof.

The present invention will be described below.
In order to solve the above-mentioned problem, the invention according to claim 1 has a first spherical surface portion formed of a part of a spherical surface having a predetermined radius, substantially the same center as the first spherical surface portion, and An insert having an outer peripheral surface having a second spherical portion made of a part of a spherical surface having a radius larger than that of the first spherical portion, the insert being inserted, and the first spherical portion and the second spherical portion An exterior body having a first spherical surface concave portion and a second spherical surface concave portion corresponding to each of the spherical surface portions on an inner peripheral surface, and a thrust load applied in an axial direction of the insert body is applied to the insert body. The second spherical portion can be received, and a radial load applied in a radial direction with respect to the axis of the insert can be received by the first spherical portion of the insert, and the first spherical portion is Formed around the axis of the insert and the center in the axial direction is the most inflated The second spherical portion is formed around the axis of the insert and the end of the first spherical portion in the axial direction is swelled most, and the second spherical portion of the insert is Provided on both sides of the first spherical surface portion in the axial direction, the second spherical surface concave portion of the exterior body also corresponds to the second spherical surface portion of the concave portion for the first spherical surface portion. A first segment provided on both sides in the axial direction, wherein the exterior body is divided by a cut surface perpendicular to the axis of the exterior body and having the first spherical surface recess; and the second spherical surface A pair of second segments each having a recess for a part , wherein the first spherical surface portion of the insert has an undercut that is recessed from the second spherical portion, A sliding film is coated around the first spherical portion and the second spherical portion, and the sliding Film is a spherical mechanical element is outsert molded around the first spherical portion of the insert.

According to a second aspect of the invention, in the spherical mechanical element according to claim 1, between said insert and said outer body is hollow to allow the insertion member is swung with respect to the outer body It is provided.

The invention according to claim 3 is the spherical machine element according to claim 2 , wherein the cavity is filled with a lubricant.

According to a fourth aspect of the present invention, in the spherical machine element according to the first aspect, the first segment is outsert-molded around the insert.

The invention according to claim 5 is the spherical machine element according to claim 1, wherein the first segment is formed by joining divided segments divided by a cut surface including an axis of the exterior body. And

According to the first aspect of the present invention, since the center of the first spherical portion and the second spherical portion of the insert is substantially the same, the insert can swing with respect to the exterior body. Since the insert has the first and second spherical portions having different radii, the radial load and the thrust load that can be loaded can be adjusted while keeping the size of the spherical machine element compact. In addition, since the first spherical portion with a small radius receives a radial load and the second spherical portion with a large radius receives a thrust load, the load that can be applied can be made close to the radial load. In addition, since the radius of the first spherical portion that receives the radial load is reduced, the outer diameter of the spherical machine element can also be reduced. Furthermore, it is possible to receive a thrust load in both axial directions of the insert. Furthermore, the first and second segments of the outer package can be mounted around the first and second spherical portions of the insert that has a concave undercut. Furthermore, the insertion body swings smoothly with respect to the exterior body. Furthermore, even if the first spherical surface portion of the insert has an undercut that is recessed relative to the second spherical portion, a sliding film can be formed around the first spherical portion of the insert.

According to the second aspect of the present invention, the insert can be swung with respect to the exterior body.

According to the third aspect of the present invention, the insert body swings smoothly with respect to the exterior body.

According to the fourth aspect of the present invention, even if the first spherical portion of the insert has an undercut that is recessed relative to the second spherical portion, the first spherical portion of the insert is surrounded by the first spherical portion. One segment can be formed.

According to the fifth aspect of the present invention, even if the first spherical portion of the insert has an undercut that is recessed relative to the second spherical portion, the first spherical portion of the insert is surrounded by the first spherical portion. One segment can be formed.

The perspective view of the spherical bearing of 1st embodiment of this invention Side view of spherical bearing Perspective view of inner ring of spherical bearing Cross section of spherical bearing Perspective view of another example of spherical bearing 5 is a perspective view of the inner ring of the spherical bearing of FIG. The figure which shows an example of the manufacturing process of the spherical bearing of 1st embodiment (state which processed the inner ring) The figure which shows an example of the manufacturing process of the spherical bearing of 1st embodiment (The state which coat | covered the sliding film in the 1st spherical part of the inner ring) The figure which shows an example of the manufacturing process of the spherical bearing of 1st embodiment (The state which shape | molded the 1st segment in the inner ring) The figure which shows an example of the manufacturing process of the spherical bearing of 1st embodiment (The state which coat | covered the sliding film in the 2nd spherical part of the inner ring) The figure which shows an example of the manufacturing process of the spherical bearing of 1st embodiment (The state which mounted | wore the 1st segment with the O-ring) The figure which shows an example of the manufacturing process of the spherical bearing of 1st embodiment (The state which fixed the 2nd segment to the 1st segment) The perspective view of the spherical bearing of 2nd embodiment of this invention Side view of the spherical bearing of FIG. FIG. 13 is a perspective view of the inner ring of the spherical bearing of FIG. The disassembled perspective view of the spherical bearing of 3rd embodiment of this invention. The perspective view of the spherical bearing of 4th embodiment of this invention The perspective view which saw through the outer ring | wheel of the spherical bearing of FIG. The figure which shows an example of the manufacturing process of the spherical bearing of 4th embodiment (The state which processed the inner ring | wheel) The figure which shows an example of the manufacturing process of the spherical bearing of 4th embodiment (The state which coat | covered the sliding film in the 1st spherical part of the inner ring) The figure which shows an example of the manufacturing process of the spherical bearing of 4th embodiment (The state which fitted the lower division segment to the inner ring) The figure which shows an example of the manufacturing process of the spherical bearing of 4th embodiment (The state which couple | bonded a pair of division | segmentation segment) The figure which shows an example of the manufacturing process of the spherical bearing of 4th embodiment (The state which coat | covered the sliding film in the 2nd spherical part of the inner ring) Sectional drawing which shows an example (sleeve caulking) of the outer ring coupling method using caulking Sectional drawing which shows the other example (radial direction caulking) of the joining method of the outer ring | wheel using caulking Sectional drawing which shows the other example (axial caulking) of the outer ring | wheel coupling method using caulking The figure which shows an example of the division | segmentation segment joining method The figure which shows an example of the coupling | bonding method of the division body using caulking The figure which shows an example of the coupling | bonding method of a division body Sectional view along the axis of a conventional spherical bearing Cross section of conventional rod end A perspective view of a conventional ball joint (including a partial cross section) Sectional view along the axis of a conventional spherical bearing

Explanation of symbols

1, 21, 31, 41 ... outer ring (exterior body)
2,22,44 ... Inner ring (insert)
3, 23 ... axis 4, 24, 47 ... first spherical portion 5, 25, 48 ... second spherical portion 4a, 5a ... sliding film 47a ... split sliding film 8, 28, 43, 71 ... first Segment 8a, 28a, 36 ... first spherical surface recess 9, 29, 42, 72 ... second segment 46, 76 ... segment 9a, 29a, 37 ... second spherical surface recess 31a, 31b, 74 ... Division 11 ... Cavity R1 ... Radius R2 of the first spherical surface part ... Radius P of the second spherical surface part ... Center
(1)… Radial load
(2)… Thrust load

  1 and 2 show a first embodiment (spherical bearing) of a spherical machine element of the present invention. FIG. 1 shows a perspective view of a spherical bearing, and FIG. 2 shows a side view. An inner ring 2, which is an example of an insertion body, is incorporated inside a cylindrical outer ring 1, which is an example of an exterior body. As shown in FIG. 2, the inner ring 2 can swing within a predetermined inclination angle α with respect to the outer ring 1. The shape of the outer ring 1 and the inner ring 2 is a rotating body (that is, a shape formed by being rotated about the axis 3 and having symmetry).

  FIG. 3 shows a perspective view of the inner ring 2. The inner ring 2 has a first spherical surface portion 4 at a central portion in the axial direction, and has second spherical surface portions 5 at both end portions in the axial direction. A connecting portion 10 between the first spherical portion 4 and the second spherical portion 5 is recessed. The first spherical surface portion 4 is formed around the axis 3 and is centered most in the axial direction. The second spherical portion 5 is formed around the axis 3 and the end on the first spherical portion 4 side is swelled most. The outer diameter of the second spherical portion 5 is larger than the outer diameter of the first spherical portion 4. The inner ring 2 is made of a metal such as iron or aluminum and is manufactured by casting or forging. On the surfaces of the first and second spherical portions 4 and 5 of the inner ring 2, self-lubricating fluororesin, molybdenum disulfide, graphite, or low-sliding nylon, Teflon (registered trademark), polyacetal Or the like, or sliding films 4a and 5a made of a resin molded product or the like. A through hole 6 extending in the axial direction is formed in the inner ring 2. When using a spherical bearing, the shaft is inserted into the through hole 6, and a nut is screwed into the male screw machined into the shaft, and the shaft is fastened to the inner ring 2.

  FIG. 4 shows a cross-sectional view of a spherical bearing. The first spherical surface portion 4 of the inner ring 2 is composed of a part of a spherical surface having a radius R1 centered on the axis. Since the first spherical surface portion 4 is covered with the sliding film 4a, the surface of the sliding film 4a is actually a part of the spherical surface. The second spherical portion 5 provided at both axial ends of the first spherical portion 4 has substantially the same center P as the first spherical portion 4 and has a radius R2 larger than that of the first spherical portion 4. Consists of a part of a spherical surface. Here, “the center is substantially the same” means that the first spherical portion 4 and the second spherical portion 5 are the same point as the first spherical portion 4 and the second spherical portion 5. The case where the center of 5 is slightly displaced so that the inner ring 2 can swing with respect to the outer ring 1 is also included. Since the second spherical surface portion 5 is also covered with the sliding film 5a, the surface of the sliding film 5a actually comprises a part of a spherical surface.

  The outer ring 1 is divided into three parts as a whole, and includes a first segment 8 in the center in the axial direction and a pair of second segments 9 attached to both ends of the first segment 8 in the axial direction. A first spherical portion recess 8 a corresponding to the first spherical portion 4 is formed on the inner periphery of the ring-shaped first segment 8. In other words, the first spherical surface recess 8a is formed of a part of a spherical surface with a radius R1 having a center P on the axis 3, and the center in the axial direction is most concave. A second spherical portion recess 9 a corresponding to the second spherical portion 5 is also formed on the inner periphery of the ring-shaped second segment 9. That is, the second spherical surface concave portion 9a is formed of a part of a spherical surface having a radius R2 having a center P on the axis 3, and the end on the first spherical surface concave portion 8a side is most concave. When the inner ring 2 swings between the outer periphery of the connecting portion 10 between the first spherical portion 4 and the second spherical portion 5 and the inner periphery of the second segment 9, the second spherical surface of the inner ring 2. A cavity 11 is provided so as to avoid interference between the part 5 and the second segment 9. The first and second segments 8 and 9 are made of metal such as iron or aluminum.

  Since the first spherical portion 4 is sandwiched in the axial direction between the pair of second spherical portions 5, the inner ring 2 has an undercut that is recessed in the central first spherical portion 4. Since the outer diameter of the second spherical portion 5 of the inner ring 2 is larger than the inner diameter of the first segment 8, the first segment 8 cannot pass through the second spherical portion 5. For this reason, the first segment 8 is manufactured by outsert molding around the first spherical surface portion 4 of the inner ring 2. Specifically, the inner ring 2 is inserted into a mold, and the molten metal is manufactured by die casting around the first spherical surface portion 4 of the inner ring 2. Die casting is a casting method in which a molten product such as an aluminum alloy or a zinc alloy is pressed into a precision mold by pressure to obtain a casting.

  The second segment 9 is manufactured separately from the inner ring 2 by casting, forging or cutting. The second segment 9 is fitted around the second spherical surface portion 5 of the inner ring 2 and is coupled to both end surfaces of the first segment 8 in the axial direction. Ring-shaped O-ring grooves 8b and 9b are processed on the opposing surfaces of the first segment 8 and the second segment 9, respectively. An O-ring 13 that seals the joint surface is fitted into the O-ring grooves 8b and 9b.

  A radial radial load (1) and an axial thrust load (2) are applied to the inner ring 2 with respect to the axis 3. The first spherical surface portion 4 receives a radial load (1) applied to the inner ring 2 and the second spherical surface portion 5 receives a thrust load (2). That is, when a radial load (1) is applied to the inner ring 2, the first spherical surface portion 4 of the inner ring 2 comes into contact with the first spherical surface recess 8a of the first segment 8, and the thrust load (2) is applied. Then, the second spherical portion 5 of the inner ring 2 and the second spherical portion recess 9a of the second segment 9 come into contact with each other.

  The second spherical surface portion 5 of the inner ring 2 and the second spherical surface concave portion 9a of the outer ring 1 when a thrust load (2) is applied to the inner ring 2 while keeping the inclination angle α of the inner ring 2 constant. In order to increase the contact area, the radius R2 of the second spherical surface portion 5 must be increased. On the other hand, even if the radius of the first spherical portion 4 is small, when the radial load (1) is applied to the inner ring 2, the first spherical portion 4 of the inner ring 2 and the first spherical portion of the outer ring 1 are used. There is a tendency that the contact area of the recess 8a becomes large. If the radius of the second spherical portion 5 that receives the thrust load (2) is increased and the radius of the first spherical portion 4 that receives the radial load (1) is reduced, the thrust load (2) that can be applied is reduced to the radial load ( Can be close to 1). Further, by making the radius R1 of the first spherical surface portion 4 smaller than the radius R2 of the second spherical surface portion 5, the outer diameter of the spherical bearing can be made compact.

  5 and 6 show other examples of spherical bearings. FIG. 5 shows a perspective view of the spherical bearing, and FIG. 6 shows a perspective view of the inner ring. In the spherical bearing of this example, the first and second spherical portions 4 and 5 of the inner ring 2 are not covered with a sliding film. This is because if the first spherical portion 4 and the second spherical portion 5 are covered with a sliding film, the cost may increase. Thus, it is not necessary to cover the first spherical portion 4 and the second spherical portion 5 with the sliding film. If the sliding film is not covered, the first and second spherical surface portions 4 and 5 of the inner ring 2 are in sliding contact with the first and second spherical surface recesses 8a and 9a of the outer ring 1 directly. In order to reduce the frictional resistance of the sliding contact portion, the cavity 11 (see FIG. 4) is filled with lubricating oil such as sliding surface oil or grease.

  7 to 12 show an example of the manufacturing process of the spherical bearing. As shown in FIG. 7, first, the first spherical portion 4 and the second spherical portion 5 are processed on the outer periphery of the metallic inner ring 2 by casting, forging, or cutting.

  Next, as shown in FIG. 8, a sliding film 4a made of a resin such as fluororesin, polyetherketone, nylon, or an alloy such as brass is formed around the first spherical portion 4, and the first spherical portion 4 is formed. A sliding film is attached to the spherical surface portion 4. This molding is called outsert molding because it is a molding in which a resin or the like is attached around the first spherical surface portion 4. Instead of the synthetic resin, another solid lubricant or a low sliding material may be coated.

  Next, the first segment 8 is outsert-molded around the first spherical surface portion 4 as shown in FIG. Specifically, the first spherical surface portion 4 of the inner ring 2 is inserted into a mold, and molten metal is die-cast into the mold. Since the first spherical surface portion 4 of the inner ring is undercut, such a molding process is necessary. The O-ring groove 8b of the first segment 8 may be cut after die casting.

  Next, as shown in FIG. 10, a slide film 5a made of a resin such as fluororesin, polyetherketone, nylon, or an alloy such as brass is formed around the second spherical surface portion 5 by outsert molding. Instead of the synthetic resin, another solid lubricant or a low sliding material may be coated.

  Next, as shown in FIG. 11, the O-ring 13 is fitted into the O-ring groove 8 b of the first segment 8.

  Finally, as shown in FIG. 12, the second segment 9 is fitted around the second spherical portion 5 of the inner ring 2 to couple the second segment 9 to the first segment 8. If the second segment 9 is outsert-molded around the second spherical portion 5 of the inner ring 2, the periphery of the second spherical portion 5 is buried. Since the cavity disappears and the inner ring 2 cannot swing with respect to the outer ring 1, the second segment 9 is manufactured in advance by casting, forging or cutting, and is fitted into the inner ring 2 later.

  13 and 14 show a second embodiment (spherical bearing) of the spherical machine element of the present invention. This spherical bearing also includes an outer ring 21 and an inner ring 22 fitted to the outer ring 21, and the inner ring 22 can swing with respect to the outer ring 21 within a range of a predetermined inclination angle.

  FIG. 15 shows a perspective view of the inner ring. The inner ring 22 has a first spherical portion 24 and a second spherical portion 25 on its outer peripheral surface. Unlike the spherical bearing of the first embodiment, the second spherical portion 25 is formed only on one side of the first spherical portion 24 in the axial direction.

  As shown in FIG. 14, the center P of the first spherical portion 24 is substantially the same as the center P of the second spherical portion 25, and the radius R2 of the second spherical portion 25 is the first spherical portion. It is larger than the radius R1 of 24. Then, the second spherical surface portion 25 receives a thrust load (2) acting in one axial direction of the inner ring 22, and the first spherical surface portion 24 receives a radial load (1) acting radially on the axial line 23. receive.

  The outer ring 21 includes a first segment 28 in which a first spherical portion recess 28 a corresponding to the first spherical portion 24 is formed, and a second spherical portion recess 29 a corresponding to the second spherical portion 25. It is divided into a second segment 29 to be formed. The second segment 29 is provided only on one side of the first segment 28.

  Depending on how the spherical bearing is used, it may be necessary to apply a thrust load (2) in only one axial direction. In such a case, one of the pair of second spherical portions 25 can be omitted as in the spherical bearing of this embodiment.

  FIG. 16 shows a third embodiment (spherical bearing) of the spherical machine element of the present invention. This spherical bearing also includes an outer ring 31 and an inner ring 2 fitted to the outer ring 31, and the inner ring 2 can swing with respect to the outer ring 31 within a range of a predetermined inclination angle. The outer ring 31 of this embodiment is not divided by a cross section perpendicular to the axis of the cylindrical outer ring 1 as in the spherical bearing of the first embodiment, but a cross section including the axis of the cylindrical outer ring 31. For example, it is divided into a plurality of divided bodies 31a and 31b. Since the structure of the inner ring 2 is the same as that of the spherical bearing of the first embodiment, the same reference numerals are given and description thereof is omitted.

  Each divided body 31a, 31b is formed with a half circumference of first and second spherical surface recesses 36, 37 corresponding to the first and second spherical surface portions 4, 5 of the inner ring 2, respectively. Each divided body 31a, 31b is manufactured by casting, forging or cutting. A groove 35 extending in the circumferential direction is formed around each divided body. After the inner ring 2 is assembled between the pair of divided bodies 31a, 31b, a coupling means such as a coil spring 33, a rubber band, a heat shrinkable tube, or the like rounded into a circle is fitted into the groove 35. The coupling means couples the pair of divided bodies 31a and 31b so as not to be separated.

  In addition, instead of the coil spring 33, a cylindrical housing 34 can be used as the coupling means. The housing 34 and the outer ring 31 are preferably fitted with a tight fit. The coil spring 33 and the housing 34 may be used in combination to form a coupling means. Moreover, you may couple | bond each division body 31a, 31b directly by welding, such as laser welding.

  In a state in which the inner ring 2 is incorporated inside the divided bodies 31a and 31b, a cavity for swinging the inner ring 2 is provided between the divided bodies 31a and 31b and the inner ring 2. The inner ring 2 may or may not be coated with a sliding film made of a solid lubricant. When the sliding film is not covered, the cavity is filled with lubricating oil.

  According to the spherical bearing of the third embodiment, since the man-hour for the outer ring 31 can be reduced, the manufacturing cost of the outer ring 31 can be reduced.

  17 and 18 show a spherical bearing according to a fourth embodiment of the present invention. Similar to the spherical bearing of the first embodiment, the spherical bearing of this embodiment includes a central first segment 43 in which the outer ring 41 is divided by a cross section orthogonal to the axis of the outer ring 41, and the first segment 43. A pair of second segments 42 provided on both sides in the axial direction are combined. At both ends in the axial direction of the outer peripheral surface of the first segment 43, receiving ports 43a having a reduced diameter are formed (see FIG. 22). The end of the second segment 42 is fitted into the receiving opening 43a.

  The first segment 43 is formed by joining divided segments 46 divided by a cross section including the axis of the outer ring 41 by a coupling means such as a bolt or welding. The second segment 42 is fixed to the first segment 43 by welding such as laser welding, MIG welding, or TIG welding after being fitted into the receiving port 43a of the first segment 43.

  19 to 23 show manufacturing process diagrams of the spherical bearing of the fourth embodiment. First, the first spherical portion 47 and the second spherical portion 48 are processed on the outer peripheral surface of the inner ring 44 by casting, forging, or cutting.

  Next, as shown in FIG. 20, a sliding film 47a made of a resin such as fluorine resin, nylon, polyether ketone, or an alloy such as brass is coated around the first spherical surface portion 47 of the inner ring 44. The sliding film 47a may be outsert-molded around the first spherical surface portion 47, or may be formed by combining a divided sliding film 47a made of a resin molded product divided into two semicircles. .

  Next, as shown in FIG. 21 and FIG. 22, the divided segments 46 divided into two semicircles are fitted around the sliding film 47 a, and these are coupled by coupling means such as bolts and welding.

  Next, as shown in FIG. 23, the second spherical surface portion 48 is covered with a ring-shaped sliding film 48a. The sliding film 48 a may be outsert-molded on the second spherical surface portion 48, or may be manufactured by fitting a molded product that has been previously resin-molded into the second spherical surface portion 48.

  Next, as shown in FIG. 17, the second segment 42 is attached to the second spherical portion 48. The first segment 43 is formed with a receiving port 43a (see FIG. 23). The second segment 42 is fitted into the receiving opening 43 a of the first segment 43. After fitting the second segment 42 to the first segment 43, these are joined by laser welding or the like. As shown in FIG. 18, an air vent hole 42 a at the time of laser welding is processed in the second segment 42. The first segment 43 and the second segment 42 may be laser-welded at the same time as the first segment 43 and the second segment 42 are laser-welded.

  By forming the stepped receiving port 43 a in the first segment 43, laser welding can be prevented from entering the outer ring 41. Further, the O-ring can be omitted by welding the first segment 43 and the second segment 42.

  In the spherical bearings of the first, third and fourth embodiments, the first spherical portions 4 and 47 of the inner ring 2 and 44 are smaller in diameter than the second spherical portions 5 and 48, so the inner rings 2 and 44 are The center is a concave undercut. In order to correspond to the undercut inner rings 2, 44, the outer rings 1, 41 are divided into three parts by a cut surface perpendicular to the axis, or the outer rings 31 are divided into two parts by a cut surface including the axis.

  And as a means to couple | bond the outer ring | wheel divided | segmented into plurality, the above-mentioned welding and bolt coupling | bonding are used. In addition to welding and bolt connection, it is also possible to use caulking. Hereinafter, a coupling method using caulking will be described.

  FIG. 24 shows an example of a coupling method using caulking. A cylindrical sleeve 73 is press-fitted around the first segment 71 and the second segment 72. The sleeve 73 is fitted to the inner portion 72 a of the second segment 72. A taper may be formed on the inner peripheral surface of the sleeve 73. After press-fitting the sleeve 73, the end 73a of the sleeve 73 is bent inward so as to be plastically deformed. Note that the first segment 71 and the second segment 72 may be coupled by bending both ends of the cylindrical sleeve 73.

  25 and 26 show a method of directly caulking the first segment 71 and the second segment 72 without using a sleeve. FIG. 25 shows the caulking in the radial direction, and FIG. 26 shows the caulking in the axial direction. As shown in FIG. 25, after the second segment 72 is fitted to the first segment 71, a radial caulking force is applied to the end 72a of the second segment 72, and the end 72a is bent inward. Thus, the first segment 71 and the second segment 72 may be fixed.

  As shown in FIG. 26, after the second segment 72 is fitted inside the first segment 71, an axial caulking force is applied to the first segment 71 or the second segment 72 to One segment 71 and the second segment 72 may be combined. In this example, since the first segment 71 is arranged outside the second segment 72, it is necessary to combine the first segment 71 divided into two semicircles before caulking. . As a method of joining the first segments 71, welding can be used. As shown in FIG. 27, a hook-like catching portion 76a is provided in the divided segment 76 so that they are engaged with each other. May be. Since the divided segment 76 can slide along the spherical surface of the inner ring 2, the work of engaging the catch portion 76a is facilitated.

  FIG. 28 shows an example in which the divided body 74 divided into two along the axis is coupled using the sleeve 75. After the sleeve 75 is press-fitted into the divided body 74, the two divided bodies 74 are joined by bending the end portion of the sleeve 75.

  FIG. 29 shows another example of a method for joining two divided bodies 74. Each of the divided bodies 74 may be provided with a hook-shaped hooking portion 74a so that they are engaged with each other.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention. The radius of the first spherical portion and the radius of the second spherical portion can be variously changed according to the radial to be loaded and the thrust load. For example, when the radial load is large, the radius of the first spherical portion may be larger than the radius of the second spherical portion. If it carries out like this, the length of the axial direction of a spherical bearing can be made small. Further, the insert has a third spherical surface portion formed of a part of a spherical surface having a radius R3 different from the radii R1 and R2 of the first spherical surface portion and the second spherical surface portion, and the exterior body is a third spherical surface portion. You may have a corresponding 3rd spherical part recessed part. However, even in this case, the center of the third spherical portion needs to substantially coincide with the centers of the first and second spherical portions.

  This description is based on Japanese Patent Application No. 2006-296748 filed on October 31, 2006 and Japanese Patent Application No. 2007-256279 filed on September 28, 2007. All this content is included here.

  The spherical mechanical element of the present invention can be applied to a spherical bearing, a rod end shown in FIG. 31, a ball joint shown in FIG. 32, or a pillow ball. Since it has the characteristic that the rigidity in the thrust direction is high, it is suitable as a substitute for a ball bush or a pillow ball incorporated in an automobile suspension.

Claims (5)

A first spherical surface portion comprising a part of a spherical surface having a predetermined radius and a first spherical surface portion having a substantially same center as the first spherical surface portion and having a larger radius than the first spherical surface portion. An insert having a second spherical surface portion on the outer peripheral surface;
An exterior body in which the insertion body is inserted and has a first spherical surface recess and a second spherical surface recess corresponding to the first spherical surface portion and the second spherical surface portion on the inner peripheral surface, Prepared,
A thrust load applied in the axial direction of the insert can be received by the second spherical portion of the insert,
A radial load applied in a radial direction with respect to the axis of the insert can be received by the first spherical portion of the insert,
The first spherical portion is formed around the axis of the insert and the center in the axial direction is most swelled,
The second spherical portion is formed around the axis of the insert and the end on the first spherical portion side in the axial direction is most swelled,
The second spherical portion of the insert is provided on both sides of the first spherical portion in the axial direction;
The concave portion for the second spherical portion of the exterior body is also provided on both sides in the axial direction of the concave portion for the first spherical portion, corresponding to the second spherical portion,
The exterior body is divided by a cut surface perpendicular to the axis of the exterior body, the first segment having the first spherical surface recess and the pair of second having the second spherical surface recess. Ri Na by joining the segments,
The first spherical portion of the insert is an undercut that is recessed from the second spherical portion,
A sliding film is coated around the first spherical portion and the second spherical portion of the insert,
The sliding film is a spherical machine element that is outsert-molded around the first spherical portion of the insert .   The spherical machine element according to claim 1, wherein a cavity is provided between the outer package and the insert so that the insert can swing with respect to the outer package.   The spherical machine element according to claim 2, wherein the cavity is filled with a lubricant.   The spherical machine element according to claim 1, wherein the first segment is outsert molded around the insert.   The spherical machine element according to claim 1, wherein the first segment is formed by joining divided segments divided by a cut surface including an axis of the exterior body.

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