JP2012012855A - Slewing bearing of work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a slewing bearing of a work machine which has high strength against a load downwardly applied to a slewing bearing by the pitching motion of the work machine, thereby preventing damage from being caused thereto.SOLUTION: The work machine includes: a lower structure; a super structure rotatably mounted on the upper part of the lower structure via a slewing bearing; and a work apparatus attached to the super structure. The slewing bearing of the work machine includes: an inner ring attached to the upper part of the lower structure; an outer ring 82 attached to the super structure; and balls inserted between the inner ring and the outer ring. In at least any one of the outer ring and the inner ring, a flange part 82b which extends radially is formed. Between the flange part and the inner ring or the outer ring, rolling bodies are inserted, and the rolling bodies are attached to the outer ring side. A large number of the rolling bodies are provided in the circumferential direction of the outer ring, and more rolling bodies are provided in the front and rear side of the outer ring than in the left and right side thereof.

Description

  The present invention relates to a slewing bearing for a work machine having a slewing function, and is particularly suitable for a slewing bearing for a construction machine, such as a hydraulic excavator, in which vibration or impact load acts during work.

  In a work machine in which an upper swing body for performing work is attached to a lower traveling body for traveling so as to be capable of swiveling, a swing bearing (slewing bearing) is provided at a joint portion between the lower traveling body and the upper swing body. The upper swing body can be freely swung with respect to the lower traveling body via the swing bearing. As this kind of prior art, there is one described in JP-A-8-105437 (Patent Document 1).

JP-A-8-105437

  The slewing bearing described in Patent Document 1 is for housing balls of the slewing bearing on the inner peripheral surface of the outer ring of the slewing bearing fixed to the upper slewing body and the outer peripheral surface of the inner ring fixed to the lower traveling body. An annular groove is formed, and the ball is inserted into the annular groove.

Construction machines such as a hydraulic excavator excavate earth and sand using a working device provided on an upper swing body or travel on rough terrain using a crawler track of a lower traveling body. At this time, vibration is generated in the vehicle body, and the swing bearing connecting the lower traveling body and the upper swing body has a backlash, which causes a problem that the vibration is amplified.
Increase in vehicle body vibration not only brings about deterioration in work efficiency and riding comfort, but also increases vibration load on the slewing bearing, and as a result, the annular groove provided on the inner ring and outer ring of the slewing bearing, The balls may cause damage such as indentations. The damage formed in the annular groove of the slewing bearing brings about adverse effects such as vibrations such as grooving and an increase in resistance load with respect to the slewing motion at the time of slewing.

  The slewing bearing is subjected to loads in all directions, up and down, left and right, and front and rear. However, when the load acts on the lower traveling body downward from the upper revolving body, the lower traveling body receives a reaction force from the ground and releases the load. Therefore, a particularly large load acts on the slewing bearing connecting the upper swing body and the lower traveling body, and there is a risk of damaging the slewing bearing.

  For this reason, as shown in Patent Document 1, a structure has been proposed in which the slewing bearing is less likely to be damaged by vehicle vibrations and loads during work and travel. However, in the thing of this patent document 1, it was set as the structure which provided the disk part which protrudes in the radial direction outer side in the inner ring | wheel lower part of a slewing bearing, and inserted the steel ball (rolling body) in this disk part. No particular consideration is given to preventing damage to the slewing bearing and improving its strength against a load that acts downward on the slewing bearing, particularly in relation to pitching operation during excavation work of a hydraulic excavator.

  Moreover, in the thing of patent document 1, although it is set as the structure which gives a vibration damping effect | action as a structure which interposes a buffer member (elastic body) between the said steel ball, an inner ring | wheel, and an outer ring | wheel, a steel ball is inferior in intensity | strength. Since it rolls in contact with the buffer member, the buffer member is likely to be damaged. Furthermore, the positional relationship between the steel balls and the inner and outer rings is also undefined, so that if the steel balls move and the circumferential position changes, the load distribution received by the balls of the slewing bearing becomes non-uniform, resulting in There is a problem that the risk of damaging the ball of the slewing bearing, the annular groove of the inner ring or the outer ring, and the like is high.

An object of the present invention is to obtain a slewing bearing for a work machine that has high strength and can prevent the occurrence of damage with respect to a load acting downward on the slewing bearing in relation to a pitching operation of the work machine.
Another object of the present invention is to provide a slewing bearing for a working machine capable of obtaining a buffering effect and a vibration reducing effect against a load and vibration acting on the slewing bearing portion and preventing damage to the buffer member (elastic body). There is in getting.

  To achieve the above object, the present invention relates to a lower traveling body, an upper revolving body rotatably attached to an upper portion of the lower traveling body via a swivel bearing, and a working device attached to the upper revolving body. The swing bearing includes an inner ring attached to an upper portion of the lower traveling body, an outer ring attached to the upper swing body, and a ball interposed between the inner ring and the outer ring. In the slewing bearing, at least one of the outer ring and the inner ring is formed with a radially extending flange portion, and a rolling element is provided between the flange portion and the other inner ring or outer ring that does not form the flange portion. The rolling elements are disposed on the outer ring side, and a large number of rolling elements are provided in the circumferential direction of the outer ring, and at least the front and rear sides of the outer ring are more than the left and right sides, respectively. Number of the rolling element is provided, at least a portion of the vertical load acting on the outer ring, characterized by being configured for supporting at the rolling element which is mounted on the outer ring side.

  In the above, preferably, the outer ring is formed such that a flange portion protrudes radially inward from an upper portion thereof, and the rolling element is provided between the flange portion and the inner ring, and the rolling element is A plurality of rolling elements are provided in the circumferential direction of the flange portion of the outer ring, and a plurality of the rolling elements are attached to the front side and the rear side of the flange portion (that is, the front side and the rear side of the upper swing body). It is good to do so.

  The inner ring is formed such that a flange portion protrudes radially outward from the lower portion thereof, and the rolling element is provided between the flange portion and the outer ring, and the rolling element faces the flange portion. A plurality of rolling elements may be provided in the circumferential direction of the outer ring lower surface, and a plurality of rolling elements may be attached to the front side and the rear side of the outer ring lower surface.

  In the assembled state of the slewing bearing, the dimension S from the central axis of the shaft member of the rolling element to the portion where the outer cylindrical member of the rolling element is in contact with the other member is the diameter D of the outer cylindrical member. Since the rolling element generates a force that constantly pushes the outer ring of the slewing bearing upward, the load in the vertical direction acting on the ball portion of the slewing bearing is configured to be smaller than half (D / 2). Can be further reduced.

  The rolling element is constituted by a shaft member, an outer cylinder member disposed coaxially with the shaft member, and an elastic body provided so as to fill a space between the shaft member and the outer cylinder member. A buffering effect and a vibration reducing effect can be obtained with respect to the load and vibration acting on the slewing bearing.

According to the present invention, it is possible to obtain a slewing bearing for a work machine that has high strength and can prevent occurrence of damage with respect to a load acting downward on the slewing bearing in relation to the pitching operation of the work machine. .
Further, by configuring the rolling element with a shaft member, an outer cylinder member arranged coaxially with the shaft member, and an elastic body provided so as to fill a space between the shaft member and the outer cylinder member, It is possible to obtain a buffering effect and a vibration reducing effect against a load and vibration acting on the slewing bearing portion, and to prevent damage to the elastic body (buffer member).

1 is a front view showing a hydraulic excavator as a work machine to which the present invention is applied. The perspective view of the track frame shown in FIG. FIG. 2 is a perspective view of the swing body frame shown in FIG. 1. FIG. 2 is a diagram illustrating the first embodiment of the present invention and a partial cross-sectional view of the structure in the vicinity of the slewing bearing illustrated in FIG. FIG. 5 is an enlarged cross-sectional view in the vicinity of the slewing bearing shown in FIG. 4. FIG. 6 is a perspective view showing an overall overview of an outer ring of the slewing bearing shown in FIGS. 4 and 5. FIG. 6 is an enlarged cross-sectional view of the vicinity of the roller shown in FIG. 5. The elements on larger scale which looked at the outer ring of the slewing bearing shown in FIG. 5 from the inner lower side. The longitudinal cross-sectional view which expands and shows the roller shown in FIG.

  Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, the present invention is applied to a hydraulic excavator as a work machine.

A first embodiment of the present invention will be described with reference to FIGS. In each figure, the part which attached | subjected the same code | symbol has shown the part which is the same or it corresponds.
In FIG. 1, reference numeral 1 denotes a hydraulic excavator (work machine). The hydraulic excavator 1 includes a lower traveling body 2 and an upper revolving body that is rotatably attached to an upper portion of the lower traveling body 2 via a revolving bearing 8. 3 and a work device 4 attached to the front portion of the upper swing body 3.

  In the lower traveling body 2, an idler 2a, a sprocket 2b, a lower roller 2c, an upper roller 2d, a traveling motor 2e, and the like are attached to a track frame 6 serving as a skeleton, and the idler 2a, sprocket 2b, lower roller 2c, and upper roller A crawler belt 2f is wound around 2d, and the excavator 1 is configured to travel through the crawler belt 2f by rotating the sprocket 2b with the travel motor 2e.

The upper swing body 3 has a configuration in which a driver's cab 3a, a counterweight 3b, a work device 4 and the like are attached to a swing body frame 7. Further, although not shown, the upper swing body 3 is also provided with an engine, a hydraulic pump, a control valve, and the like.
The working device 4 includes a boom 4a attached to the swing body frame 7 so as to be able to move up and down, an arm 4b attached to the boom 4a so as to be rotatable, and a bucket 4c rotatably attached to the arm 4b. The boom 4a is operated by a boom cylinder 4d, the arm 4b is operated by an arm cylinder 4e, and the bucket 4c is operated by a bucket cylinder 4f.

  FIG. 2 is a perspective view (overhead view) showing the structure of the track frame 6. The track frame 6 includes a center frame 61, a circular cylinder 62 provided in the center of the center frame 61, and left and right sides of the center frame 61. The left and right track side frames 63 and 64 are provided. The center frame 61 includes a central frame portion 61a located at the center, a left front leg portion 61b and a right front leg portion 61c that are located on the front side of the central frame portion 61a and extend in the left-right direction, and a rear side of the central frame portion 61a. The left rear leg 61d and the right rear leg 61e are located in the left and right direction and extend in the left-right direction.

A left track side frame 63 is attached to the front ends of the left front leg 61b and the left rear leg 61d, and a right track side frame 64 is attached to the front ends of the right front leg 61c and the right rear leg 61e. Is attached.
Reference numeral 62 denotes a round cylinder provided on the central frame portion 61a of the center frame 61. The circular cylinder 62 is for attaching a swing bearing. The round body 62 is disposed at the center position of the central frame portion 61a, and is attached to the upper surface of the central frame portion 61a by welding or the like, and is fixed to the upper end portion of the support cylindrical body 62a horizontally. The ring-shaped flange portion 62b is fixed to the inner lower end portion of the flange portion 62b, and the lid portion 62c is formed such that the center portion is raised upward in a hat shape.

FIG. 3 is a perspective view of the revolving body frame 7 shown in FIG. 1. The revolving body frame 7 includes a center frame 71 mounted on the lower traveling body 2 shown in FIG. The left side frame 74 and the right side frame 75 project in the left-right direction.
The center frame 71 has a center plate 71a to which the swivel bearing 8 is attached on the lower surface thereof, and a pair of left and right centers that are separated from each other and extend in the front-rear direction on the upper surface side of the center plate 71a. Beams 72 and 72 are provided. A front portion side of each center beam 72 is a bracket portion 72a for connecting a base end side of the boom 4a with a pin, and a rear end side of each center beam 72 is attached to a counterweight protruding rearward. The counter weight 3b (see FIG. 1) is attached to the counter weight attaching portion 73 with a bolt or the like. Further, each center beam 72 includes an upper flange 72b, a lower flange 72c, and a beam plate 72d, and is formed in an H-shaped cross section.

  FIG. 4 is a diagram illustrating the first embodiment of the present invention, and is a diagram illustrating a partial cross section of the structure in the vicinity of the slewing bearing illustrated in FIG. In the figure, reference numeral 61 denotes a center frame of the track frame 6 constituting the lower traveling body 2, and a support cylinder 62a is provided on the center frame 61a of the center frame 61, and a swivel bearing is provided above the support cylinder 62a. The center frame 71 of the revolving structure frame 7 constituting the upper revolving structure 3 is placed via 8. The slewing bearing 8 is composed of an inner ring 81, an outer ring 82, a ball 83 interposed between the inner ring 81 and the outer ring 82, and the inner ring 81 is fixed on a flange portion 62b above the support cylinder 62a with bolts 84. The outer ring 82 is fixed to the center plate 71 a of the center frame 71 with bolts 85. Further, an inner gear 86 is formed on the inner periphery of the inner ring 81, and this inner gear 86 is a gear (pinion gear) (not shown) by a hydraulic turning drive device (not shown) installed on the upper swing body 3. ) Is driven through. Accordingly, the upper swing body 3 is configured to be capable of being driven to rotate on the lower traveling body 2 via the swing bearing 8.

  FIG. 5 is an enlarged cross-sectional view in the vicinity of the slewing bearing 8 shown in FIG. 4, and annular grooves 81a and 82a having semicircular cross sections are formed on the outer peripheral surface of the inner ring 81 and the inner peripheral surface of the outer ring 82, respectively. The outer ring 82 is fitted into the inner ring 81 so that the ball 83 made of steel balls is interposed in the annular grooves 81a and 82a, and the slewing bearing 8 is configured.

  As shown in FIGS. 5 and 6, the outer ring 82 is formed such that a flange portion 82 b protrudes radially inward from the upper portion thereof. The flange portion 82b is provided with a plurality of rectangular holes 87 arranged in a circular shape in the circumferential direction. In this embodiment, as shown in FIG. 6, a large number of rectangular holes 87 are provided densely in the front-rear direction (X direction in FIGS. 3 and 6) with respect to the upper swing body 3. 3 is not provided in the left-right direction (Y direction in FIGS. 3 and 6) as shown in FIG. 6, or is provided less sparsely than in the front-rear direction.

Further, as shown in FIGS. 7 and 8, a pin groove 88 is formed in the radial direction of the slewing bearing 8 at the edge portion on the lower surface side of the flange portion 82 b of each rectangular hole 87. A shaft member 89a of a roller (rolling element) 89 is rotatably mounted. Therefore, the roller 89 is rotatably accommodated in each of the rectangular holes 87.
With this configuration, at least a part of the vertical load acting on the outer ring 82 can be supported by the roller 89 provided between the flange portion 82b and the inner ring 81, and the turning The load acting on the ball 83 of the bearing 8 can be reduced.

  The hydraulic excavator 1 is a so-called pitching machine in which the working device 4 is attached in the X-axis direction (see FIG. 3) of the revolving body frame 7 and works by moving the working device 4 up and down (Z-axis direction in FIG. 3). There are many movements. For this reason, it often receives a rotational moment around the left-right direction axis (Y axis shown in FIG. 3) of the revolving structure frame 7 during work, and the magnitude of this rotational moment is also large. In this embodiment, a large number of the rollers 89 shown in FIG. 5 are densely provided in a range located in the front-rear direction of the upper swing body 3 (X-axis direction in FIGS. 3 and 6) as shown in FIG. Since each rectangular hole 87 is provided, the roller 89 provided with a large number of densely against the rotational moment about the horizontal axis (Y axis) of the upper swing body 3 (the swing body frame 7) is effectively used. I can take it. Therefore, according to the present embodiment, the contact load between the ball 83 of the slewing bearing 8 and the annular grooves 81a and 82a is applied to the load acting downward on the slewing bearing in relation to the pitching operation of the work machine. It is possible to obtain a slewing bearing for a working machine that can be effectively reduced and has high strength and can prevent damage.

  In FIG. 5, a dimension L is a radial distance from the center of the support cylinder 62a to the center of the roller 89. In this embodiment, the dimension L is formed so as to protrude radially inward from the upper part of the outer ring. Since the roller (rolling element) 89 is interposed between the flange portion 82b and the inner ring 81, the dimension L can be reduced. The smaller the dimension L, the smaller the bending moment acting on the support cylinder 62a. Therefore, the vertical load acting on the outer ring 82 of the slewing bearing is applied to the support cylinder 62a via the roller 89 and the inner ring 81. And it can be easily received by the flange portion 62b.

As shown in the above-mentioned patent document 1, a disk part protruding radially outward is provided at the lower part of the inner ring of the slewing bearing, and a steel ball (rolling element) is inserted in this disk part. Since the disc portion (flange portion) is cantilevered, it is difficult to ensure sufficient strength of the disc portion, and the distance from the support cylinder to the steel ball (corresponding to the dimension L in this embodiment) The bending moment acting on the support cylinder of the base plate also increases. For this reason, since the vertical load acting on the outer ring of the slewing bearing acts on the disk portion as a large bending moment via the steel balls, it is difficult to ensure sufficient strength of the slewing bearing. become.
In addition, in Patent Document 1, in consideration of pitching operation during excavation work of a hydraulic excavator, etc., no consideration is given to preventing damage to the slewing bearing and improving strength against a load acting downward on the slewing bearing. Absent.

  On the other hand, according to the present embodiment, as described above, the radial dimension L from the center of the support cylinder 62a to the center of the roller 89 can be reduced, so that it acts on the outer ring 82 of the slewing bearing 8. A load in the vertical direction can be easily received by the support cylinder 62a. Therefore, the load acting on the ball portion of the slewing bearing can be sufficiently reduced, and as a result, the strength of the slewing bearing 8 can be sufficiently ensured. Further, in this embodiment, the upper surface of the flange portion 82b provided on the outer ring is attached in contact with the lower surface of the center plate 71a together with the upper surface of the outer ring 82. It is also possible to prevent that a sufficient load cannot be supported.

  Further, in this embodiment, since the position of the roller 89 is arranged inside the portion of the ball 83, foreign matter such as dust is less likely to enter the portion of the roller 89 from the outside. The effect which can prevent the damage of 89 is also acquired.

  In this embodiment, as shown in FIGS. 7 and 9, the roller 89 is composed of a shaft member 89a, an outer cylinder member 89b, and an elastic body 89c. The elastic member 89c is configured to fill the space between the cylindrical members 89b. Further, the outer cylinder member 89b of the roller 89 is configured to abut on the upper surface of the inner ring 81 so that a part of the vertical load acting on the outer ring 82 is supported via the roller 89. Therefore, the load acting on the ball 83 portion of the slewing bearing 8 can be reduced, and damage to the annular grooves 81a and 82a of the inner and outer rings in contact with the ball 83 of the slewing bearing can be prevented. Further, the elastic body 89c constituting the roller 89 can provide a buffering effect and a vibration reducing effect against the load and vibration acting on the orbiting bearing portion. In addition, in this embodiment, the elastic body 89c is not easily damaged because the outer cylinder member 89b having high strength, for example, steel, is provided on the outer peripheral side of the elastic body 89c.

  FIG. 7 shows a state in which the roller 89 shown in FIG. 9 is mounted in the rectangular hole 87 of the flange portion 82b of the outer ring 82 and the slewing bearing is assembled, and in this state, from the central axis of the shaft member 89a of the roller 89 The dimension S up to the lower part of the outer cylinder member 89b in contact with the upper surface of the inner ring 81 is configured to be smaller than half (D / 2) of the diameter D of the outer cylinder member 89a. Accordingly, the elastic body 89c of the roller 89 generates a force that constantly pushes the flange portion 82b of the outer ring 82 upward, and the load in the vertical direction acting on the ball portion of the slewing bearing can be further reduced.

  That is, since the elastic body 89c of the roller 89 always pushes up the outer ring 82 of the slewing bearing 8 upward, the downward force acting on the inner ring 81 from the outer ring 82 via the ball 83 can be reduced. 81a and the contact force between the annular groove 82a of the outer ring 82 and the ball 83 are reduced, and it is possible to prevent the annular grooves 81a and 82a from being damaged such as indentations.

  In the above-described embodiment, the example in which the flange portion is formed so as to protrude radially inward from the upper portion of the outer ring of the slewing bearing and the rolling element is provided between the flange portion and the inner ring has been described. The present invention is not limited to such an embodiment. That is, a flange portion extending in the radial direction is formed on at least one of the outer ring and the inner ring, and a rolling element is interposed between the flange portion and the other inner ring or outer ring not forming the flange portion, and The rolling elements are attached to the outer ring side, and a large number of rolling elements are provided in the circumferential direction of the outer ring, and at least a plurality of the rolling elements are provided on the front side and the rear side of the outer ring, respectively. Thus, at least a part of the vertical load acting on the outer ring may be supported by the rolling element attached to the outer ring side. Therefore, for example, as shown in Patent Literature 1, a flange portion is formed so as to protrude radially outward from a lower portion of the inner ring, and the rolling element is interposed between the flange portion and the outer ring. A plurality of rolling elements are provided in the circumferential direction of the lower surface of the outer ring facing the flange portion, and a plurality of the rolling elements are provided on the front side and the rear side of the lower surface of the outer ring, respectively. It is also possible to configure so that the is attached.

  Further, the rolling element provided between the flange portion and the inner ring or the outer ring is not limited to the roller described in the present embodiment. For example, instead of the roller, a steel as described in Patent Document 1 is used. It is also possible to use a sphere.

DESCRIPTION OF SYMBOLS 1 Hydraulic excavator 2 Lower traveling body (2a: idler, 2b: sprocket, 2c: lower roller, 3d: upper roller, 2e: traveling motor, 2f: crawler belt)
3 Upper swing body (3a: cab, 3b: counterweight)
4 Working devices (4a: boom, 4b: arm, 4c: bucket, 4d: boom cylinder, 4e: arm cylinder, 4f: bucket cylinder)
6 track frame 61 center frame (61a: center frame part, 61b: left front leg part, 61c: right front leg part, 61d: left rear leg part, 61e: right rear leg part)
62 Round cylinder (62a: support cylinder, 62b: flange part, 62c: lid member)
63 Left truck side frame 64 Right truck side frame 7 Revolving body frame 71 Center frame (71a: Center plate)
72 Center beam (72a: bracket portion, 72b: upper flange, 72c: lower flange, 72d: beam plate)
73 Counterweight mounting portion 74 Left side frame 75 Right side frame 8 Slewing bearing 81 Inner ring (81a: annular groove)
82 Outer ring (82a: annular groove, 82b: flange part)
83 Ball 84, 85 Bolt 86 Internal gear 87 Rectangular hole 88 Pin groove 89 Roller (rolling element) (89a: shaft member, 89b: outer cylinder member, 89c: elastic body).

Claims (5)

A lower traveling body, an upper revolving body rotatably attached to an upper portion of the lower traveling body via a swivel bearing, and a working device attached to the upper revolving body, wherein the swivel bearing includes the lower traveling body In a slewing bearing of a work machine comprising an inner ring attached to an upper part of a traveling body, an outer ring attached to the upper revolving body, and a ball interposed between the inner ring and the outer ring,
A flange portion extending in the radial direction is formed in at least one of the outer ring and the inner ring, and a rolling element is interposed between the flange portion and the other inner ring or outer ring that does not form the flange portion, and the rolling is performed. A moving body is attached to the outer ring side, and a large number of rolling elements are provided in the circumferential direction of the outer ring, and at least a plurality of the rolling elements are provided on the front side and the rear side of the outer ring, respectively. And
A slewing bearing for a working machine, wherein at least a part of a vertical load acting on the outer ring is supported by the rolling elements attached to the outer ring side.   2. The slewing bearing for a work machine according to claim 1, wherein the outer ring is formed such that a flange portion protrudes radially inward from an upper portion thereof, and the rolling element is provided between the flange portion and the inner ring. A large number of rolling elements are provided in the circumferential direction of the flange portion of the outer ring, and a plurality of the rolling elements are attached to the front side and the rear side of the flange portion, respectively. Slewing bearings for work machines.   2. The slewing bearing for the work machine according to claim 1, wherein the inner ring is formed such that a flange portion protrudes radially outward from a lower portion thereof, and the rolling element is provided between the flange portion and the outer ring. A large number of rolling elements are provided in the circumferential direction of the lower surface of the outer ring facing the flange portion, and a plurality of the rolling elements are respectively attached to the front side and the rear side of the lower surface of the outer ring. A slewing bearing for a working machine.   The slewing bearing for the work machine according to any one of claims 1 to 3, wherein the outer cylindrical member of the rolling element is in contact with another member from the central axis of the shaft member of the rolling element in a state where the slewing bearing is assembled. Since the dimension S up to the portion of the outer cylinder member is configured to be smaller than half of the diameter D (D / 2) of the outer cylinder member, the rolling element generates a force that pushes the outer ring of the slewing bearing upward. A slewing bearing for a work machine.   The slewing bearing for the work machine according to any one of claims 1 to 4, wherein the rolling element includes a shaft member, an outer cylinder member disposed coaxially with the shaft member, the shaft member, and the outer cylinder member. A slewing bearing for a working machine, characterized in that the slewing bearing is constituted by an elastic body provided so as to fill a gap.

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