JP2003176815A - Bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device capable of precluding intrusion of dust and sand/earth from the two ends of a rotary shaft of a bearing member and its seal part and also preventing the bearing member from rattling, scuffing, etc. <P>SOLUTION: A floating seral 16 is installed over a sleeve 14 fitted on a pair of booms 2 and an arm 3, and the booms 2 and arm 3 capable of making relative rotation are supported by a coupling pin 11, and the retaining force of the floating seal is always maintained by pressing the sleeve 14 in the axial direction by the coupling pin 11 and grasping. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a construction machine,
The present invention relates to a bearing device having a pin connecting portion used in industrial machines and civil engineering machines.

[0002]

2. Description of the Related Art Generally, in a bearing device used in a hydraulic shovel or the like, a sealing mechanism such as a floating seal, an O-ring (O-ring), an oil seal, and a dust seal is used in order to seal lubricating oil in the bearing portion. . The sealing mechanism using the floating seal has an excellent function of preventing dust, earth and sand, etc. from intruding into the bearing portion from the seal portion during excavation of the hydraulic shovel or loading work of earth and sand and the like. A bearing device using this floating seal is disclosed in Japanese Patent Application Laid-Open No. 9-60733. In this bearing device, as shown in FIG. 6, a roller 30 as a rotating member and a collar 3 as a fixed member.
1 and a fixed shaft 32 as a rotating shaft. The inside of the lubricating oil filling chamber 33 defined by these members is sealed by the floating seals 34 and 35 on the rotating side and the fixed side. The sealing surface 36 of the floating seal is O
The seal rings 37 are arranged so as to come into contact with each other by the pressing force due to the compressive deformation of the rings 38, and the seal ring 37 is held in a floating state. Further, the collar 31 is fixed to the fixed shaft by the pin 39 and regulates the movement in the axial direction.

However, if the roller 30 is excessively used or used for many years, the rotation of the roller 30 may be blurred.
The collar 31 receives a force in the axial direction due to an increase in the gap due to wear of the abutting portions. In addition, since a minute gap is formed between the pin insertion hole 40 of the fixed shaft 32 and the pin 39, due to these reasons, the pin 39 and the pin insertion hole 40 may slightly increase in size. It causes rattling. Therefore, the collar 31 holding the fixed floating seal 35 is easily moved in the axial direction, and the seal holding force of the floating seals 34 and 35 is weakened.

Further, when the roller 30 and the collar 31 can be moved in the axial direction between the fixed shafts 32, rattling, galling, etc. are generated thereby, and noise, vibration, wear, etc. are more likely to occur. In addition, since both ends of the fixed shaft 32 are exposed to the outside through the pin insertion holes 40 of the collar 31, during excavation of the hydraulic shovel or loading of sand or the like, dust, galling, etc. may cause dust, Sediment may enter between the fixed shaft 32 and the collar 31 and between the roller 30 and the collar 31.

The above-mentioned noise, vibration, and
Abrasion and the like will further increase and intensify. In such a state, not only the working environment of the hydraulic shovel is deteriorated, but also each member of the bearing portion is likely to be worn early. Further, as the sealing condition of the floating seal becomes weaker, the lubricating oil leaks, which adversely affects the environment and causes the bearing portion to be easily worn. Therefore, it is always necessary to replenish the lubricating oil.

As a means for preventing intrusion of dust, earth and sand, etc. from both ends of the rotating shaft exposed to the outside, Japanese Patent Application Laid-Open No. HEI-1 is proposed.
The bearing device described in Japanese Patent Publication No. 1-37138 has been proposed. In this bearing device, as shown in FIG. 7, the left and right brackets 41, 41 and the arm boss 42 arranged between the brackets are rotatably arranged relative to each other via a connecting pin 43. Both ends of the connecting pin 43 are held in a state in which they do not come off by the stopper plates 44, 44 fixed to. Bracket 41,4
An O-ring 45 is arranged between the arm 1 and the arm boss 42 and between the brackets 41, 41 and the stopper plate 44 to seal the lubricating oil in the bearing device.

However, even if the bearing is sealed with an O-ring, an oil seal, or a dust seal during the excavation of the hydraulic shovel or the loading of soil or the like, the bearing part such as dust, sediment or the like passes through these seals. Intrusion cannot be prevented. Further, if the lubricating oil is leaked, the bearing portion is more likely to be worn away, so that the lubricating oil needs to be replenished.

There is a bearing device described in Japanese Patent Laid-Open No. 9-32844, which has a large diameter head at one end of a rotating shaft exposed to the outside and uses a floating seal as a sealing mechanism. . This bearing device is a bearing device in a pin coupling portion of a working device equipped on a construction machine, and as shown in FIG. 8, a boss at the tip of an arm 48 is interposed between a pair of brackets 46, 46 via a connecting pin 47. The parts 49, 49 are provided so as to be rotatable relative to each other.

Between the pair of brackets 46, 46, a pair of inner bushes 51, 51 are press-fitted into the connecting pin 47 and integrally connected to each other by a sealing pipe 50.
Are arranged. Each inner bush 51, 51 and boss 4
Floating seals 52, 52 and outer bushes 53, 53 are provided between the nine.
Are arranged in a floating state so that their respective sealing surfaces are in contact with each other. Large diameter head 5 of connecting pin 47
4 side is attached to one bracket 46, and the connecting pin 4
The other end side of 7 is attached to the other bracket 46 via a retaining pin 55 and a fixing ring 56. Connecting pin 4
Numeral 7 is retained in a state where it is locked against the pair of brackets 46, 46 and is locked.

However, if the arm 48 and the bracket 46 are excessively used or used for many years, the rotation of the arm 48 and the bracket 46 is deviated, and the axial direction is generated between the inner bush 51 and the bracket 46 and between the inner bush and the retaining ring 57. Will always receive the power to. In addition, the pin insertion hole 58 of the connecting pin 47
Since a minute gap is formed between the retaining pin 55 and the retaining pin 55, due to these causes, slight rattling or galling occurs in the retaining pin 55 and the pin insertion hole 58 although gradually. Therefore, the connecting pin 47 also easily moves in the axial direction, and as a result, the seal holding force of the floating seal is weakened.

Further, noise, vibration, wear, etc. are likely to occur due to rattling or galling. Moreover, one end of the connecting pin is exposed to the outside through the pin insertion hole, and during excavation of the hydraulic shovel or loading of sand or the like, dust, galling, etc. may cause dust,
Sediment may enter the space between the bracket and the connecting pin, the space between the inner bush and the bracket, the floating seal, etc. The above noise, vibration,
Abrasion and the like will further increase and intensify. In such a state, not only the working environment of the hydraulic shovel is deteriorated, but also each member of the bearing portion is likely to be worn early. Further, as the sealing condition of the floating seal becomes weaker, the lubricating oil leaks, which adversely affects the environment and causes the bearing portion to be easily worn. Therefore, it is always necessary to replenish the lubricating oil.

[0012]

As can be seen from the above, the one using the floating seal as the sealing mechanism is excellent in preventing dust, earth and sand, etc. from invading from the sealing portion to the bearing portion. Although it has a structure, there is a problem in the structure that restricts the movement of the floating seal member in the axial direction of the rotating shaft. Therefore, the function of the floating seal mechanism is not fully utilized. Also, in order to prevent the intrusion of dust, earth and sand, etc. from both ends of the rotating shaft portion exposed to the outside, it can be prevented by covering both ends of the rotating shaft. Infiltration of dust, earth and sand, etc. from the used seal part is allowed. Even if the intrusion of dust, earth and sand, etc. from one side of the rotating shaft is prevented, the intrusion from the exposed side of the rotating shaft cannot be prevented.

An object of the present invention is to prevent intrusion of dust and earth and sand from both end sides of a rotary shaft and a seal portion in a bearing member, and further prevent rattling and galling of the bearing member. It is an object of the present invention to provide a bearing device that can prevent rattling and galling even when galling occurs and can prevent dust, earth and sand, and the like from entering the bearing portion from the seal portion.

[0014]

The above object can be effectively achieved by the inventions according to the claims of the present application having the following matters. That is, the invention according to claim 1 has a pair of brackets having a sleeve fitting hole, a rotating member arranged between the same pair of brackets, having a connecting pin insertion hole, and a connecting pin fitting hole. A pair of sleeves fitted in the sleeve fitting hole and abutting a part of the peripheral edge of the sleeve fitting hole, and an end portion of the sleeve on the insertion side into the sleeve fitting hole and an end portion of the rotating member A pair of floating seals for sealing the space, a large-diameter head that abuts the peripheral portion of the connecting pin fitting hole, and a threaded joint portion at the other end, and both end sides are the connecting pin fitting hole. A connecting pin that is inserted and has a central portion inserted into the connecting pin insertion hole, and a stopper member that has a mounting hole, covers the outer end surface of the sleeve, and abuts a part of the outer surface of the bracket, and the same mounting Fixed by screwing with the screw joint through the hole In the bearing device being characterized in that a fixing member that.

In the present invention, since the pair of sleeves are sandwiched by the connecting pins, the urging force is always applied from the connecting pins in the direction toward each other. Even if the rotation of the rotating member is shaken, the sleeve is held by the connecting pin, so that the floating seal between the sleeve and the rotating member can maintain the sealed state. Further, even when the floating seal is assembled, the gap for causing the rotating member to rotate can be minimized. As a result, it is possible to reduce the cause of play. As a result, noise and vibration due to backlash can be prevented, and the sealing condition of the floating seal can be maintained at all times, so that lubricating oil does not leak from the floating seal, and therefore there is no need to replenish the lubricating oil and oil leakage. It is possible to prevent contamination due to. Further, it is possible to always prevent the intrusion of foreign matter such as dust and earth and sand.

According to the invention of claim 2, in addition to the matters of claim 1, the threaded joint portion is a screw hole or a bolt hole formed in the sleeve, and the fixing member is the screw hole or the bolt hole. It is in a bearing device that limits the matters that are screws or bolts that fit together. In the present invention, the connection pin is fixed by screwing a screw or a bolt, and the connection pin can be attached to the bracket by tightening the screw or the bolt. Since it can be strongly tightened with screws or bolts, it is possible to reliably prevent the sleeve from moving in the axial direction.

Further, in the assembling work of the floating seals, the O-ring is urged in a direction in which the two floating seals are brought into contact with each other to compressively deform, and the deforming force brings the two floating seals into contact with each other to perform the assembling work. Is going. At this time, in the conventional one, a pressing tool must be used to compressively deform the O-ring,
In the present invention, the fixing force between the connecting pin and the stopper member by the screw fixing means can be utilized.

Therefore, a special tool is not required, and furthermore, the work of assembling the floating seal can be performed at the same time when the connecting pin and the stopper member are attached. The number of screws or bolts to be screwed and fixed is preferably two or more, and by using a plurality of screws or bolts, a strong tightening force can be obtained, and at the same time, it acts as a rotation stop between the connecting pin and the stopper member.

According to a third aspect of the invention, in addition to the matters of the first aspect, the screw coupling portion is a bolt formed on the sleeve, and the screw fixing member is a nut fitted in the bolt hole. The bearing device is limited to. In the present invention, the connecting pin can be attached to the bracket by tightening the nut. Since the bolt and the nut can be strongly tightened, it is possible to reliably prevent the sleeve from moving in the axial direction.

In addition, the assembling work of the floating seals is performed by urging the O-ring in a direction in which the two floating seals are brought into contact with each other to compressively deform the two floating seals and bringing the two floating seals into contact with each other. Is going. At this time, in the conventional one, a pressing tool must be used to compressively deform the O-ring,
In the present invention, the fixing force between the connecting pin and the stopper member by the screw fixing means can be utilized.
For this reason, a special tool is not required, and furthermore, the work of assembling the floating seal can be performed at the same time when the connecting pin and the stopper member are attached. In addition, it is desirable to use a plurality of bolts and nuts of two or more. By using a plurality of bolts and nuts, a strong tightening force can be obtained, and the bolts and nuts also act as a rotation stop between the connecting pin and the stopper member.

The invention according to claim 4 resides in a bearing device in which, in addition to the matters of claim 1, the matters in which the stopper member is stopped from rotation are limited. According to the present invention, since the stopper member is stopped from rotating, the stop between the connecting pin and the bracket can be surely performed.

The invention according to claim 5 resides in a bearing device in which, in addition to the matters of claim 1, the rotating member is limited to a member which is divided into two between a pair of sleeves.

According to the present invention, since the pair of sleeves are biased by the connecting pin in the direction in which the sleeves face each other, even if the rotating member arranged between the sleeves is divided into two parts, the divided rotating members are It can be used without being divided into left and right during rotation. For this reason, in the past, the rotary member was manufactured as an integral one, but it can be manufactured in two parts, which increases the degree of freedom in the manufacturing process and the design of the rotating body.

The invention according to claim 6 is characterized in that the bearing device according to claim 1 is used as a bearing device in a construction machine, an industrial machine or a civil engineering machine.

According to the present invention, by using the bearing device of the present invention as a bearing device for a machine used in a working environment in which a large amount of dust, earth and sand, etc. are generated and scattered, and these foreign substances easily enter the bearing device. Since these foreign substances can be prevented from entering, the workability of the machine used in such a working environment can be improved.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be specifically described below with reference to the accompanying drawings. Figure 1
Shows a hydraulic excavator to which the bearing device according to the present embodiment is applied, and a work device for performing excavation work and the like is disposed on the upper swing body 1 of the hydraulic excavator so that the work device can be elevated.

The working device is a boom 2 that is pin-connected to the upper swing body 1, an arm 3 that is pin-connected to the tip of the boom 2, and a work member that is pin-connected to the tip of the arm 3. And a bucket 4 and the like.
Between the upper swing body 1 and the boom 2, the boom 2 and the arm 3
Between the arm 3 and the bucket 4, a boom cylinder 5, an arm cylinder 6 and a bucket cylinder 7 are connected via pin connecting portions, respectively, and each cylinder is operated to rotate each member. . For example, the boom 2 and the arm 3 are relatively rotatably coupled via the bearing device shown in FIG.

In FIG. 2, a bifurcated boom 2 is constructed as a pair of brackets, and the bifurcated boom 2 is arranged so as to sandwich the tip of an arm 3 as a rotating member. A pair of bushes 25 are closely fitted in the bush fitting holes 24 of the arm 3, and a sliding surface with the connecting pin 11 is formed on the inner peripheral surface of the bush 25. A space defined by the pair of bushes 25, 25, the arm 3 and the connecting pin 11 is formed as an oil and fat accommodating portion 26. An oil supply passage (not shown) that is provided in the axially intermediate portion of the arm 3 and extends in the radial direction communicates with the oil storage portion 26. A nipple (not shown) for oil and fat is detachably attached to the other end of the oil and fat passage. A sleeve fitting hole 10 is formed in each of the two-pronged booms 2, and the sleeves 14, 1
4 is closely fitted in the sleeve fitting hole in a state where a stepped contact portion 15 formed on the sleeve is in contact with the peripheral edge of the sleeve fitting hole 10.

Both ends of the connecting pin 11 are press-fitted into the connecting pin fitting holes 13 of the sleeve, and a pair of bushes 25 are provided at the center.
And the arm 3 is rotatably supported via a pair of bushes. The connecting pin 11 has a large-diameter head 19 side provided on one axial side thereof attached to the one boom 2, and an axial other end side formed on the other end thereof as a screw coupling section as a screw coupling section. It is attached to the other boom 2 via a fixing member 22, which is screwed with the stopper member 21, the stopper member 21, and the screw coupling portion 20.

As shown in FIG. 4, a partial cutout 8 is formed in the stopper member 12, and the cutout 8 and the stepped portion 9 formed in the boom 2 are brought into contact with each other to prevent the boom 2 from rotating. Has been done. Without forming a notch in the stopper member 12, the fixing member such as a bolt is used to attach to the boom, or the abutting member such as a bolt provided on the boom and the abutting member provided on the stopper member are brought into contact with each other. By doing so, an appropriate structure such as a rotation stopper can be adopted to provide the rotation stopper. Further, the screw coupling portion and the screw fixing portion screwed into the screw fixing portion are provided at a plurality of positions, and the connecting pin is firmly fixed to the stopper member and serves as a rotation stopper. For this reason, the connecting pin 11 is held in the rotation-stopped state while preventing the pair of sleeves 14 and 14 from moving relative to the pair of brackets 22, while preventing the pair of sleeves 14 and 14 from moving away from each other. . At the end of the arm 3 and the end of the sleeve 14, annular grooves 27 for arranging the floating seals 16,
28 is formed.

FIG. 3 is a partially enlarged view of a seal portion using a floating seal as a seal member. The floating seal 16 is composed of a seal ring 17 and an O ring 18. The seal ring 17 is formed, for example, of a resin having a high wear resistance, a metal material, or the like into a substantially trapezoidal cross section, and the outer peripheral surface thereof forms a concave curved inclined curved surface. An O-ring 18 is arranged on the inclined curved surface, and seal surfaces (sliding surfaces) of the seal rings 17 that face each other in the axial direction are in contact with each other, and a predetermined surface pressure is generated by the elastic force due to the compressive deformation of each O-ring 18. Therefore, they press each other and slidably contact each other. The floating seal is not particularly limited, and a commonly used floating seal can be used.

The seal ring 1 is formed in the annular grooves 27 and 28 formed at the respective ends of the sleeve 14 and the arm 3 with a small clearance.
7 is loosely fitted, and the O-ring 18 abutting against the inner peripheral surface of each end of the sleeve 14 and the arm 3 is pressed to compressively deform the O-ring 18 so that the seal surfaces of the seal ring 17 abut each other. . This attaches the floating seal 16 between the sleeve 14 and each end of the arm 3.

As a result, when the arms 3 rotate relative to the sleeve 14 (boom 2), the sealing surfaces of the respective seal rings 17 move relative to each other (sliding) while maintaining their sealing properties, and the boom 2 and It prevents dirt and sand from entering the space between the arms 3 from the outside, and prevents lubricating oil from leaking from the arms to the outside between the sliding surfaces.

In the conventional example shown in FIG. 8, the holding ring 5 attached to the inner bush 51 and the boss 49 is used.
The floating seal 52 is held between the connecting pins 47, the connecting pin 47 is attached to the one bracket 46 at the large diameter head 54 side provided at one end side in the axial direction thereof, and at the other end side in the axial direction at the retaining pin 55 and the retaining pin 55. It is attached to the other bracket 46 via a fixing ring 56, and is held in a state in which it does not come out of the pair of brackets and is prevented from rotating.

However, since the connecting pin 47 is attached to the pair of brackets 46 via the retaining pin 55, the connecting pin 47 exerts an imparting force for pressing the pair of inner bushes 51, 51 toward each other. Absent. Therefore, with the relative rotation of the arm 48 and the bracket 46,
The gap is enlarged due to wear, blurring, etc., and the force exerted on the seal portions of the seal rings of the floating seal 52 is weakened, and the function as a seal is lost. It also causes backlash, noise, and vibration.

In the present invention, the pair of sleeves 14
Since the connecting pin 11 is attached so as to be pressed in the axial direction with respect to the connecting pin 11, even if the pressing force in the axial direction is generated due to the relative rotation between the arm 3 and the boom 2, the connecting pin 11 is attached to the connecting pin 11. It is possible to provide a holding force against the pressing force. Further, the holding force can be increased by tightening the screw portion.

Further, when the floating seal is attached, the sleeves can be moved toward each other by tightening between the screw connecting portion and the screw fixing portion of the connecting pin by using a pressing tool, whereby the floating seal O can be moved. The ring can be compressively deformed to hold the floating seal between the leave and the arm. For this reason,
No special tools are required to assemble the floating seal. Further, if a gap that allows some movement is formed between the sleeve and the boom or between the connecting pin and the stopper member, when looseness in the axial direction occurs, the looseness can be removed by tightening the screw.

Although the bearing device between the arm and the boom has been described as the bearing device of the above embodiment, the bearing device of the present invention is a bearing device that supports a rotating member through a connecting pin, and thus the bearing device of the traveling body can be used. It can also be applied to bearing devices and the like attached to upper rollers, lower rollers, and the like. Further, although the large-diameter head portion of the connecting pin projects from the sleeve end surface, a housing groove for housing the large-diameter head portion may be formed in the sleeve end surface so as not to project.

FIG. 5 shows the second embodiment, and the mounting structure of the connecting pin 11 and the configuration of the pin connected to the connecting pin 11 are the same as those of the above-mentioned embodiment, so here, The description will be omitted, and the description will focus on the configuration of the two divided links B-1 and B-2, which is a feature of the second embodiment. Links B-1, B divided into two
-2 is configured as a left-right mirror surface object. The left and right sides may not be mirror-symmetrical, but the contact surfaces of the two may be made to coincide with each other to form other shapes. The links B-1 and B-2 divided into two are arranged between the pair of sleeves 14, and the third link C is arranged between the concave portions formed at the tip ends of the links B-1 and B-2. The third link C may be a hydraulic cylinder link or the like. The link A, the links B-1, B-2, and the link C are connected by a connecting pin 11. The bearing device of the present invention is also used at the other ends of the links B-1 and B-2.
2 and the bucket 7 are linked. Link B-
1 and the link B-2 are sealed with an O-ring or the like.

In the second embodiment, since the pair of sleeves are urged by the connecting pins in the directions facing each other, the two links B-1 and B-2 are also contacted between the links. It can be pressed in the direction of contact. Therefore, even if a link divided into two is used, the link is not divided into left and right parts during rotation,
It can be used in the same manner as the one formed integrally.

[Brief description of drawings]

FIG. 1 is a perspective view of a hydraulic excavator.

FIG. 2 shows a bearing device having a floating seal.

FIG. 3 is an enlarged view of a floating sill portion in FIG.

FIG. 4 is a layout view of a stopper member and a boom.

FIG. 5 is a diagram showing a second embodiment.

FIG. 6 is a bearing device including a conventional floating seal.

FIG. 7 is a bearing device in which both ends of a conventional connecting pin are covered.

FIG. 8 is a bearing device including a conventional floating seal.

[Explanation of symbols]

1 Upper revolving structure 2 boom Three arms 4 buckets 5 boom cylinder 6 arm cylinder 7 bucket cylinders 8 notches 9 steps 10 Sleeve fitting hole 11 connecting pin 12 Connection pin insertion hole 13 Connection pin fitting hole 14 Sleeve 16 Floating seal 17 seal ring 18 O-ring 19 large diameter head 20 Threaded joint 21 Stopper member 22 Fixing member 25 bush 30 Laura 31 colors 32 fixed axis 34 Rotating side floating seal 35 Fixed side floating seal 39 pin 40 pin insertion hole 41 bracket 42 Arm Boss 43 Connection pin 44 Stopper plate 46 bracket 47 connecting pin 48 arms 49 Boss 50 Sealing pipe 52 Floating seal 53 Outer bush 54 large diameter head 55 retaining pin 56 fixing ring 57 Hold ring A link B-1 One of two divided links B-2 The other of the two divided links C-link

Claims (6)

[Claims] 1. A pair of brackets 2, 2 having a sleeve fitting hole 10, a rotating member 3 arranged between the pair of brackets 2, 2 having a connecting pin insertion hole 12, and a connecting pin fitting. A pair of sleeves 14 and 14 each having a hole 13 and fitted into the sleeve fitting hole 10 and contacting a peripheral portion of the sleeve fitting hole with a part thereof, and the sleeve fitting holes of the sleeves 14 and 14. 10, a pair of floating seals 16 and 16 for sealing between the end portion on the side of insertion into 10 and the end portion of the rotating member, a large-diameter head portion 19 that abuts the peripheral portion of the connecting pin fitting hole 13 at one end, and a screw at the other end A coupling pin 20 having a coupling / joining portion 20, both ends of which are inserted into the coupling pin fitting holes 13 and 13 and a central portion of which is inserted into the coupling pin insertion hole 12; and a mounting hole, The outer end surfaces of the sleeves 14, 14 are covered, and the bra The stopper member 21 abuts against the part outer surface portions of Tsu Miyako 2, and a fixing member 22 which fixedly screwed with the screwing connector 20 through the same mounting hole, the bearing apparatus characterized by comprising a. 2. The screw coupling part 20 is a screw hole or a bolt hole formed in the sleeve, and the fixing member is a screw or a bolt fitted in the screw hole or the bolt hole. The bearing device according to claim 1. 3. The bearing device according to claim 1, wherein the threaded joint portion 20 is a bolt formed on the sleeve, and the fixing member is a nut fitted in the bolt hole. 4. The bearing device according to claim 1, wherein the stopper member 21 is prevented from rotating. 5. The bearing device according to claim 1, wherein the rotating member is a member divided into two between the pair of sleeves. 6. A bearing device having the structure according to claim 1 as a bearing device used in a construction machine, an industrial machine or a civil engineering machine.