JP2008208868A - Spherical sliding bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily exchange a sealing member without using a fixed member in a state where the main shaft is fixed to the bearing. <P>SOLUTION: An annular seal member 20 fitted in a seal fixing groove 17 provided in both axial sides of the outer ring 11 comprises circular arc members 21 circumferentially divided into two, and a seal fixing piece 23 having elasticity in the outer periphery of each circular arc member 21 is provided. In the state where the seal fixing piece 23 is seized on the seal fixing groove 17, the circular arc member 21 is pressed to a groove side face of the seal fixing groove 17 by elastic restoring force which is generated on the seal fixing piece 23 elastically deformed. By this pressing, each circular arc member 21 is fixed in the state where the main shaft 15 is fixed to the bearing without using the fixing member to the sealing fixing groove 17. Each circular arc member 21 is then easily exchanged. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a spherical plain bearing that is incorporated in a rotating shaft support portion of various mechanical devices such as construction machines and general industrial machines, supports radial loads and thrust loads in both directions, and adjusts the deviation of the axis. is there.

  2. Description of the Related Art Conventionally, a spherical plain bearing provided with an inner ring having an outer surface of a convex spherical surface and an outer ring having an inner surface of a convex spherical surface that slides on the outer diameter surface on a rotating shaft support portion of various mechanical devices. It has been incorporated. This spherical plain bearing supports a thrust load in both directions, or a radial load and a thrust load in both directions, by sliding sliding between the inner diameter surface of the outer ring and the outer diameter surface of the inner ring.

  The spherical plain bearing has a seal structure for the purpose of preventing foreign matters such as dust and muddy water from entering the bearing during rotation. In this seal structure, an annular seal member is mounted in seal mounting grooves formed on both sides of the inner surface of the outer ring, and a seal lip provided on the inner peripheral portion of the seal member is slidably contacted with the outer surface of the inner ring. It is a thing.

  The seal member is usually deteriorated due to wear or heat during operation, and its sealing performance is deteriorated. Therefore, it is necessary to replace the seal member periodically. However, since the seal member used for the above-mentioned spherical plain bearing has an annular shape, at the time of replacement, after removing the main shaft from the bearing, the seal member must be replaced and the main shaft must be attached again. It took time and effort to replace the seal member.

  For this reason, conventionally, in order to enable the replacement of the seal member without removing the main shaft, a ring-shaped seal member is divided in the circumferential direction and attached to the end face of the outer ring has been proposed ( (See Patent Document 1 FIGS. 5 and 6).

In order to fix the divided annular seal member to the outer ring, an arc-shaped fixing member that is fastened and fixed to the end of the outer ring by a bolt is used.
In other words, the divided annular seal members are arranged in an annular shape, sandwiched between the ends of the outer ring by a plurality of arc-shaped fixing members, and then divided by a method in which the fixing members are fixed to the outer ring by bolts. An annular seal member is attached.
JP 2006-300129 A

  However, it is troublesome to use a plurality of arc-shaped fixing members and fix them with bolts one by one as described above to fix each of the divided seal members, and there is a problem that it takes time for replacement.

  Therefore, the present invention does not need to be fixed with bolts one by one, and is intended to enable the divided seal member to be easily attached to the outer ring.

  In order to solve the above problems, the present invention includes an inner ring having a convex spherical outer diameter surface, and an outer ring having a concave spherical inner diameter surface that slides on the outer diameter surface, and an axial direction of the outer ring. In a spherical plain bearing in which a ring-shaped seal member composed of a plurality of arc-shaped members is fitted in seal mounting grooves provided at both ends, and a seal lip is provided on the inner peripheral portion of the seal member so as to be in sliding contact with the outer diameter surface of the inner ring. In addition, the outer peripheral portion of each arc-shaped member is provided with a seal fixing piece having elasticity that presses each arc-shaped member against the inner surface of the seal mounting groove.

  Since the seal fixing piece having elasticity to press the arc-shaped member against the seal mounting groove is provided on the outer peripheral portion of each arc-shaped member, the seal fixing piece presses the arc-shaped member against the inner surface of the seal mounting groove. The main shaft can be fixed to the seal mounting groove in a state where the main shaft is attached to the bearing without using a member.

  In addition, by providing the seal fixing pieces scattered around the outer peripheral portion of the arc-shaped member, the circumferential width of the seal fixing piece that presses the arc-shaped member into the seal mounting groove is reduced. It can be easily fixed in the groove.

  In order to avoid a decrease in sealing performance at both circumferential ends of adjacent arc-shaped members, an extension lip is provided at one circumferential end of the seal lip of each arc-shaped member, and a lip fitting recess is formed at the other end. It may be provided so that the extension lip and the lip fitting recess of adjacent arcuate members are fitted together. In addition, since each arc-shaped member has the same shape, the productivity is good.

  Further, the arc-shaped member has a circumferential cutout on an outer peripheral portion thereof, and the seal fixing piece extends in an outer diameter direction from an outer surface of the arc-shaped member, and the seal fixing piece is By providing the inner side in the circumferential direction from both ends of the notch, even when a tool is inserted from both sides of the seal fixing piece when the arc-shaped member is taken out from the seal mounting groove, the tool is placed on the outer periphery of the arc-shaped member. Not hit. Therefore, the tool is easily hooked on the seal fixing piece and pulled out in the axial direction, and the arc-shaped member can be easily taken out from the seal mounting groove.

  Further, if each arcuate member is made of a synthetic resin having elasticity, even if the arcuate member is difficult or complicated in shape by shaving, it can be easily produced with a synthetic resin.

  As described above, the spherical plain bearing of the present invention is fixed to the seal mounting groove in a state in which each arc-shaped member is attached to the bearing without using the fixing member by pressing the seal fixing piece. The seal member can be easily replaced.

  Embodiments of the present invention are shown in FIGS. As shown in FIG. 1, the spherical plain bearing of this embodiment has an inner ring 10 having a convex spherical outer diameter surface 12, and a concave spherical inner diameter surface 13 that slides on the outer diameter surface 12 of the inner ring 10. An outer ring 11 is provided, and annular seal members 20 are attached to both axial ends of the outer ring 11.

  The inner ring 10 is fitted with the outer ring 11 so that the inner diameter surface 13 of the outer ring 11 slides on the outer diameter surface 12, and a through hole 16 through which the main shaft 15 is inserted is provided at the center in the radial direction of the inner ring 10. It has been.

  The outer ring 11 fitted to the inner ring 10 is formed with circumferential seal mounting grooves 17 on both axial sides of the inner diameter surface 13, and a shoulder 18 is formed between the seal mounting groove 17 and the axial end of the outer ring 11. It has become. The outer peripheral portion of the seal member 20 is mounted in the seal mounting groove 17.

  As shown in FIG. 2, the sealing member 20 can be detachably attached with an arc-shaped member 21 made of a synthetic resin, for example, an annular body made of a synthetic resin having elasticity such as silicon, nylon, synthetic rubber or the like. Each arcuate member 21 is a seal lip 22 whose inner peripheral portion is in sliding contact with the outer diameter surface 12 of the inner ring 10. In addition, although the circular-arc-shaped member 21 is the annular body made of a synthetic resin in half (2 divisions), it is not limited to half (2 divisions), and is divided into 3 divisions and 4 divisions based on the inner diameter of the outer ring 11. It is good.

  As shown in FIG. 3A, the arc-shaped member 21 has a seal lip 22 whose inner peripheral portion is in sliding contact with the outer diameter surface 12 of the inner ring 10, and is fixed with a seal from the outer surface (axial outer surface). The piece 23 extends in the outer diameter direction.

  The seal lip 22 is provided so as to become gradually thinner toward the inner peripheral end. When the arcuate member 21 is fixed to the seal mounting groove 17 of the outer ring 11, it slides on the outer diameter surface 12 of the inner ring 10. In this state, it is elastically deformed outward in the axial direction. The seal lip 22 presses the outer ring surface 12 of the inner ring 10 due to the elastic restoring force generated along with this elastic deformation. During the operation of the bearing, the grease inside the bearing leaks to the outside, and foreign matters such as foreign matter and muddy water inside the bearing. To prevent intrusion.

  Further, as shown in FIG. 2, the seal fixing pieces 23 are provided so as to be scattered at three locations on the outer peripheral portion of each arc-shaped member 21, and the positions of the seal fixing pieces 23 are formed in an annular shape. When combined, the seal fixing pieces 23 are arranged at equal intervals.

  When the seal fixing pieces 23 are provided so as to be scattered as described above, the circumferential lengths of the seal fixing pieces 23 that are locked to the seal mounting grooves 17 are reduced. Each arcuate member 21 can be easily removed from the seal mounting groove 17 and replaced. The seal fixing piece 23 can be continuously provided in the circumferential direction of the outer peripheral portion of the arc-shaped member 21. In this case, the locking of the seal fixing piece 23 with respect to the seal mounting groove 17 only needs to be able to be removed from the seal mounting groove 17 with a light force as long as the deterioration of the sealing performance can be avoided. Further, the number of the seal fixing pieces 23 is not limited to three, and is arbitrary as long as it is possible to avoid a decrease in the sealing performance, for example, two, four, five,.

  Further, as shown in FIG. 3A, each arcuate member 21 has a circumferential cutout 24 at the outer peripheral portion thereof, and is fixed to the inner side in the circumferential direction from both ends of the cutout 24. A piece 23 is provided. That is, since both ends of the notch 24 are provided outside the both ends of the seal fixing piece 23, a tool is inserted from both sides of the seal fixing piece 23 when the arcuate member 21 is taken out from the seal mounting groove 17. However, this tool does not hit the outer periphery of the arcuate member 21. Therefore, the tool can be easily hooked on the seal fixing piece 23 and pulled out in the axial direction, and the arc-shaped member 21 can be easily taken out from the seal mounting groove 17.

  Further, an extension lip 25 is provided in the circumferential direction at one end portion in the circumferential direction of the seal lip 22 of each arcuate member 21 (see FIG. 3B). The extension lip 25 is provided so that the wall thickness thereof is thinner than that of the seal lip 22 and becomes thinner toward the inner peripheral end in the same manner as the lip 22.

  On the other hand, a lip fitting recess 26 in which the extension lip 25 is fitted is provided at the other circumferential end of the seal lip 22 of the arcuate member 21. Thus, since the extension lip 25 and the lip fitting recess 26 are provided at the circumferential end of the arcuate member 21, the circumferential ends of the adjacent arcuate members 21a and 21b are extended. The lip 25 fits into the lip fitting recess 26.

  By this fitting, the respective arc-shaped members 21 are detachably combined, and the adjacent arc-shaped members of the adjacent arc-shaped members are connected in a state where they overlap each other. For this reason, it is difficult to create a gap in this overlapped portion, and it is possible to prevent leakage of grease inside the bearing to the outside and intrusion of foreign matter and muddy water from the outside into the bearing during the operation of the bearing. The decline in sex can be avoided.

  Each arcuate member 21 is provided with an extension lip 25 at one end in the circumferential direction and a lip fitting recess 26 at the other end. Can be produced by one type of mold, and productivity is improved.

  The arc-shaped member 21 configured as described above is inserted into the seal mounting groove 17 with the seal fixing piece 23 facing outward in the axial direction, and the seal fixing piece 23 is pushed inward in the axial direction. The pushed-in seal fixing piece 23 is engaged with the groove side surface of the seal mounting groove 17 on the shoulder 18 side. At this time, since the seal fixing piece 23 is made of an elastic synthetic resin, in the locked state of the seal fixing piece 23, its tip is pressed against the groove side surface on the shoulder 18 side and elastically deforms inward in the axial direction. (Refer to the solid line in FIG. 4).

  The elastically deformed seal fixing piece 23 presses the groove side surface on the shoulder portion 18 side of the seal mounting groove 17 by the elastic restoring force, and the outer peripheral portion of the arc-shaped member 21 is a groove on the inner diameter surface 13 side of the seal mounting groove 17. Press against the side. By this pressing, as shown in FIG. 5, each arcuate member 21 is fixed to the seal mounting groove 17 in a state where the main shaft 15 is attached to the bearing. Thus, since the arc-shaped member 21 is separately fixed to the seal mounting groove 17 by pressing the seal fixing piece 23, the fixing member is not used like the seal member of the conventional spherical plain bearing. Each arcuate member 21 is fixed with the main shaft 15 attached to the bearing.

  On the other hand, in order to remove each arc-shaped member 21 fixed to the seal mounting groove 17, the locking of the seal fixing piece 23 to the seal mounting groove 17 is released. That is, after inserting a tool or a finger from both sides of the seal fixing piece 23 to be engaged with the seal mounting groove 17 toward the notch 24, the tool is hooked on the back side (inner side in the axial direction) of the seal fixing piece 23. It is only necessary to pull the seal fixing piece 23 to the seal mounting groove 17 by pulling it outward in the direction.

  In this way, the seal fixing piece 23 can be easily locked and removed from the seal mounting groove 17, so that each arcuate member 21 can be easily replaced with the main shaft 15 attached to the bearing. .

Sectional drawing which shows the spherical plain bearing of embodiment Front view showing the same arcuate member (A) A partially cutaway perspective view showing a seal fixing piece of the same arcuate member, (b) A partially cutaway perspective view showing both circumferential ends of the above arcuate member. The expanded sectional view which shows the mounting state of an arc-shaped member same as the above Front view of spherical plain bearing

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Inner ring 11 Outer ring 12 Outer diameter surface 13 Inner diameter surface 15 Main shaft 16 Through hole 17 Seal mounting groove 18 Shoulder portion 20 Seal member 21 Arc-shaped member 22 Seal lip 23 Seal fixing piece 24 Notch 25 Extension lip 26 Lip fitting recess

Claims (5)

An inner ring (10) having a convex spherical outer diameter surface (12) and an outer ring (11) having a concave spherical inner diameter surface (13) sliding on the outer diameter surface (12). 11) An annular seal member (20) made up of a plurality of arc-shaped members (21) is fitted into seal mounting grooves (17) provided at both axial ends of 11), and the inner peripheral portion of the seal member (20) is In a spherical plain bearing provided with a seal lip (22) in sliding contact with the outer diameter surface (12) of the inner ring (10),
A seal fixing piece (23) having elasticity for pressing each arc-shaped member (21) against the inner surface of the seal mounting groove (17) is provided on the outer peripheral portion of each arc-shaped member (21). Spherical plain bearing.   The spherical plain bearing according to claim 1, wherein the seal fixing pieces (23) are provided in a scattered manner on an outer peripheral portion of the arc-shaped member (21).   An extension lip (25) is provided at one end in the circumferential direction of the seal lip (22) of each arc-shaped member (21), and a lip fitting recess (26) is provided at the other end. 3. The spherical plain bearing according to claim 1, wherein the extension lip (25) and the lip fitting recess (26) are fitted together.   The arcuate member (21) has a circumferential cutout (24) on the outer periphery thereof, and the seal fixing piece (23) extends from the outer surface of the arcuate member (21) in the outer diameter direction. The spherical plain bearing according to any one of claims 1 to 3, wherein the seal fixing piece (23) is provided on the inner side in the circumferential direction with respect to both ends of the notch (24).   The spherical plain bearing according to any one of claims 1 to 4, wherein each of the arc-shaped members (21) is made of a synthetic resin having elasticity.

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