JP2009036324A - Bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device capable of preventing a retaining plate of a connection pin from protruding from an outer side face of a bracket by large length. <P>SOLUTION: This bearing device is constituted by forming an elliptical indent 20 passing through a reinforcing plate 13 fixed on the outer side faces 12B of the right and left brackets 12 in the direction of plate thickness and fitting each of the retaining plates 17, 18 provided on both end sides of the connection pin 16 into the indent 20 to prevent the connection pin 16 from coming off in the axial direction and prevent it from turning around a shaft. Consequently, since each of the retaining plates 17, 18 enters the recessed part 20 thoroughly while fitted into the indent 20, it is possible to prevent each of the retaining plates 17, 18 from protruding to the outside from the outer side face 13C of the reinforcing plate 13. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a bearing device suitable for use in, for example, a pin coupling portion of a working device equipped on a hydraulic excavator.

  Generally, a hydraulic excavator as a construction machine is provided with a self-propelled lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and an upside-down movable structure on the front side of the upper revolving body. It is roughly constituted by the working device. The working device of the hydraulic excavator is roughly constituted by a boom, an arm, and a bucket, and a bearing device is used between the upper swing body and the boom, between the boom and the arm, and between the arm and the bucket. It is connected so that it can rotate.

  Here, the bearing device used for the working device of the hydraulic excavator is usually a pair of brackets provided on one side member and facing each other, a boss member provided on the other side member and disposed between the brackets, The boss member and each bracket are generally constituted by a connecting pin that connects the brackets so as to be relatively rotatable. The axial end of the connecting pin is usually provided with a retaining plate for retaining the connecting pin in the axial direction with respect to the bracket and stopping the connecting pin around the axis (for example, Patent Document 1).

JP-A-6-300033

  In this case, a rotation restricting member that engages with a retaining plate of the connecting pin is fixed to the outer surface of each bracket opposite to the boss member by means of welding or the like. In a state where the connecting pin is inserted, the connection restricting plate is engaged with a rotation restricting member provided on the bracket, thereby restricting the connecting pin from rotating about its axis.

  On the other hand, a bearing device is known in which a reinforcing plate is fixed to the outer surface on the front end side of each bracket by means of welding or the like. According to this bearing device, the rigidity of each bracket through which the connecting pin is inserted can be increased by the reinforcing plate (see, for example, Patent Document 2).

JP 2001-330022 A

  However, in the bearing device in which the reinforcing plate is fixed to the outer surface of each bracket, it is necessary to fix the rotation restricting member that engages with the retaining plate of the connecting pin to the outer surface of the reinforcing plate. In this case, after fixing the reinforcing plate to the outer surface of each bracket and further fixing the rotation restricting member, the retaining plate for the rotation restricting member and the connecting pin protrudes greatly from the outer surface of each bracket. Will end up.

  For this reason, when performing excavation work of earth and sand using a work device of a hydraulic excavator, the rotation restricting member and the retaining pin of the connecting pin that protrude greatly from the outer surface of each bracket are connected to the hydraulic cylinder of the work device. There is a problem that the hydraulic hose is damaged by interference with the hydraulic hose.

  Further, by fixing the reinforcing plate and the rotation restricting member to each bracket by means of welding or the like, there is a problem that the number of parts increases and the number of assembling steps increases and the manufacturing cost increases. .

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide a bearing device that can prevent the retaining plate of the connecting pin from protruding greatly from the outer surface of the bracket. .

  In order to solve the above-mentioned problems, the present invention provides a pair of brackets provided on one side member and facing each other, a reinforcing plate provided on an outer side surface of the tip side for reinforcing the tip side of the bracket, and the like. The present invention is applied to a bearing device including a boss member provided on a side member and disposed between the brackets, and a connecting pin that connects the boss member and the brackets so as to be relatively rotatable.

  The feature of the configuration adopted by the invention of claim 1 is that at least one end side of the connecting pin in the axial direction is provided with a retaining plate portion for retaining the connecting pin in the axial direction with respect to the bracket. The reinforcing plate is provided with a recessed portion into which the retaining plate portion is fitted by notching a portion where the retaining plate portion is disposed.

  According to a second aspect of the present invention, the connecting pin is prevented from being removed from the bracket, and the connecting pin is prevented from rotating around the axis of the bracket.

  The invention of claim 3 is configured such that the retaining plate portion is set to a thickness dimension smaller than the thickness dimension of the reinforcing plate, and is inserted into the recessed portion when fitted into the recessed portion. It is to have done.

  According to a fourth aspect of the present invention, each bracket is joined to an end plate that constitutes a tip portion of the one side member and protrudes forward of the end plate, and the recessed portion is formed from the tip side of the bracket. The present invention is configured to extend to the front of the end plate.

  According to a fifth aspect of the present invention, the one side member is a boom whose base end side is rotatably attached to a vehicle body of a construction machine, and the other side member is an arm that is rotatably attached to the distal end side of the boom. It is in that.

  According to the first aspect of the present invention, the reinforcing plate fixed to the outer surface of each bracket is notched to form a recessed recess, and the retaining plate portion of the connecting pin is fitted into the recessed recess, thereby connecting the connecting pin. This prevents the retaining plate portion from protruding from the reinforcing plate. Therefore, since the retaining plate portion of the connecting pin can be prevented from projecting greatly from the outer surface of the bracket to the outside, it is possible to prevent the retaining plate portion from interfering with obstacles existing around it. Can do.

  According to the second aspect of the present invention, the retaining pin provided on the connecting pin is fitted into the recessed portion provided on the reinforcing plate to prevent the connecting pin from being removed in the axial direction. Rotation around the shaft can be restricted. For this reason, it is not necessary to provide a rotation restricting member for restricting the rotation of the connecting pin separately from the reinforcing plate, and accordingly, the number of parts can be reduced.

  According to the invention of claim 3, since the retaining plate portion of the connecting pin is inserted into the recessed portion when fitted into the recessed portion of the reinforcing plate, the retaining plate portion is inserted from the outer surface of the reinforcing plate. Protruding can be reliably prevented.

  According to the invention of claim 4, by providing the recessed portion of the reinforcing plate extending from the front end side of the bracket to the front of the end plate, the strength of the portion of the bracket located on the front end side of the end plate is provided. Decreases. However, when an external force is applied to the bracket via a connecting pin, etc., the tip side of the bracket will be moderately deformed than the end plate, reducing the stress acting on the joint between the bracket and the end plate. The strength of the joint can be maintained, and the rigidity of the one side member can be increased.

  According to the invention of claim 5, the retaining plate portion is provided by fitting the retaining plate portion provided on the connecting pin that connects the boom and the arm to the recessed portion provided on the reinforcing plate. Protruding to the outside of the reinforcing plate can be suppressed. Thereby, for example, when used as a bearing device between a boom and an arm constituting a work device of a construction machine, a hydraulic hose connected to a hydraulic cylinder that drives the boom or the arm has a retaining plate portion of the connecting pin. It is possible to suppress damage due to contact with the surface.

  Hereinafter, the embodiment of the bearing device according to the present invention will be described in detail with reference to FIGS. 1 to 7 by taking as an example a case where it is applied to a hydraulic excavator.

  In the figure, reference numeral 1 denotes a hydraulic excavator, and the vehicle body of the hydraulic excavator 1 is roughly constituted by a crawler type lower traveling body 2 capable of self-propelling and an upper revolving body 3 mounted on the lower traveling body 2 so as to be capable of pivoting. The working device 4 configured to perform excavation work and the like of earth and sand is provided on the front side of the upper swing body 3 so as to be able to move up and down.

  Here, the working device 4 includes a boom 5 whose base end is pivotally connected to the front end of the upper swing body 3, and an arm 6 that is pivotally connected to the distal end of the boom 5. The arm 6 is roughly constituted by a bucket 7 which is pivotally connected to the distal end side of the arm 6. The boom 5 of the work device 4 is driven by a boom cylinder 8, the arm 6 is driven by an arm cylinder 9, and the bucket 7 is driven by a bucket cylinder 10.

  Here, among the pin coupling portions of the work device 4, for example, a pin coupling portion between the distal end side of the boom 5 and the arm 6 is provided with a bearing device 11 to be described later. Will be described with reference to FIGS.

  11 is a bearing device provided between the boom 5 as one side member and the arm 6 as the other side member, and the bearing device 11 supports the arm 6 so as to be rotatable on the tip side of the boom 5. It is. And the bearing apparatus 11 is comprised by the left and right bracket 12 mentioned later, each reinforcement board 13, the arm boss | hub 14, the connection pin 16, the retaining plates 17 and 18, each recessed part 20, etc. FIG.

  Reference numerals 12 and 12 denote left and right brackets provided on the front end side of the boom 5. The brackets 12 face each other in the left and right directions, and an arm boss 14 described later is rotatably connected using a connection pin 16. Is.

  Here, as shown in FIGS. 2 to 4, the boom 5 as one side member is welded to the left and right webs (vertical plates) 5A facing in the left and right directions and the upper end side of each web 5A. The upper flange plate 5B and the lower flange plate 5C welded to the lower end side of each web 5A form a strong rectangular tube shape and extend in the front and rear directions. An end plate 5D having a substantially V-shaped bent shape is welded to the front end side of the left and right webs 5A and the upper and lower flange plates 5B and 5C, and a front end portion 5E of the end plate 5D is formed. It is the tip of the boom 5.

  On the other hand, as shown in FIGS. 2 to 4, the left and right brackets 12 are formed in a substantially triangular flat plate shape using a thick steel plate material or the like, and the end plate 5D of the boom 5 is viewed from the left and right directions. In a sandwiched state, the end plate 5D is joined by welding. Thereby, the front end side of each bracket 12 protrudes ahead from the junction 5F with the end plate 5D while facing the left and right directions at a constant interval.

  An arm boss 14 to be described later is disposed on the inner surface 12A side of the left and right brackets 12 facing each other, and a reinforcement to be described later is provided on the outer surface 12B of each bracket 12 opposite to the arm boss 14. The plate 13 is fixed. Also, pin insertion holes 12D into which connecting pins 16 described later are inserted are formed in the front end side 12C of each bracket 12, respectively.

  13 and 13 are reinforcing plates provided on the outer side surface 12B on the front end side of each bracket 12, and each reinforcing plate 13 reinforces the front end side of the bracket 12 into which a connecting pin 16 described later is fitted, and its rigidity. It is what raises. And the reinforcement board 13 is formed in the substantially rectangular flat plate shape using a thick steel plate material etc., and is being fixed to the outer side surface 12B of the bracket 12 using means, such as welding. Here, as shown in FIGS. 2 and 3, the front end side 13A of the reinforcing plate 13 is disposed on the front end side 12C of the bracket 12, and the rear end side 13B of the reinforcing plate 13 is the end plate 5D to which the bracket 12 is fixed. It extends rearward beyond the tip 5E.

  Reference numeral 14 denotes an arm boss as a boss member provided on the proximal end side of the arm 6 serving as the other side member. The arm boss 14 is disposed between the left and right brackets 12. Here, as shown in FIG. 3, the arm boss 14 has a cylindrical shape extending in the left and right directions. A bush 15 that slidably supports a connecting pin 16 (described later) is fitted and provided on the inner peripheral side of both left and right ends of the arm boss 14.

  Reference numeral 16 denotes a connecting pin for connecting the arm boss 14 and each bracket 12 so as to be relatively rotatable. The connecting pin 16 includes a bush 15 provided on the arm boss 14 and a left and right side as shown in FIG. The bracket 12 is inserted into the pin insertion hole 12D. The connecting pin 16 is always in sliding contact with the inner peripheral surface of the bush 15, and supports the arm boss 14 so as to be rotatable with respect to each bracket 12. Further, a retaining plate 17 to be described later is fixedly provided on one end side of the connecting pin 16 in the axial direction, and two female screw holes 16A extending in the axial direction are provided on the other end side of the connecting pin 16 in the axial direction. , 16A are formed.

  Reference numeral 17 denotes a retaining plate as a retaining plate portion fixedly provided on one end side of the connecting pin 16 in the axial direction. The retaining plate 17 is connected to the connecting pin 16 as shown in FIGS. Is formed as an oval flat plate extending in a direction perpendicular to the axial direction, and one end side in the length direction is a wide large diameter portion 17A, and the other end side in the length direction is a narrow small diameter portion 17B. The retaining plate 17 is integrated with the connecting pin 16 by welding the large diameter portion 17 </ b> A to one end of the connecting pin 16.

  Reference numeral 18 denotes a retaining plate as a retaining plate portion detachably attached to the other end side of the connecting pin 16 in the axial direction. The retaining plate 18 is also connected to the connecting pin 16 in the same manner as the retaining plate 17 described above. It is formed as an oval flat plate extending in a direction orthogonal to the axial direction. One end side in the length direction of the retaining plate 18 is a wide large diameter portion 18A, and the other end side in the length direction is a narrow small diameter portion 18B. Here, the large-diameter portion 18A of the retaining plate 18 is provided with two bolt insertion holes 18C, 18C, and a bolt 19 inserted into each bolt insertion hole 18C is formed on the other end side of the connecting pin 16. The retaining plate 18 is detachably attached to the other end side of the connecting pin 16 by being screwed into each of the female screw holes 16A (see FIG. 4).

  Then, as shown in FIG. 3, the connecting pin 16 is inserted into each bush 15 of the arm boss 14 and the left and right brackets 12, and the retaining plate 18 is attached to the other end side of the connecting pin 16 using a bolt 19. In the attached state, each retaining plate 17, 18 is configured to retain the connecting pin 16 in the axial direction by contacting the outer surface 12 </ b> B of the left and right brackets 12. At this time, each retaining plate 17, 18 is configured to stop the connecting pin 16 about its axis by fitting into a recessed portion 20 provided in the reinforcing plate 13 described later.

  In this case, as shown in FIG. 3, the thickness (thickness dimension) of each retaining plate 17, 18 is t, and the thickness (thickness dimension) of the reinforcing plate 13 fixed to the outer surface 12 </ b> B of the bracket 12. Is set to T, the plate thickness t of each of the retaining plates 17 and 18 is set smaller than the plate thickness T of the reinforcing plate 13 (t <T).

  20 and 20 are concave portions provided on the reinforcing plate 13 fixed to the left and right brackets 12, respectively. The concave portions 20 are provided on the retaining plates 17 and 17 provided on the connecting pin 16. 18 is fitted. Here, as shown in FIG. 3 and FIG. 4, each recessed portion 20 cuts out the portion where the retaining plates 17 and 18 are arranged in the reinforcing plate 13, thereby moving the reinforcing plate 13 in the plate thickness direction. It is formed as a long slot that penetrates.

  In this case, the recess 20 has an oval shape having a large-diameter recess 20A and a small-diameter recess 20B corresponding to the outer shape of each retaining plate 17, 18, and a bracket in which a pin insertion hole 12D is formed. 12 extends from the front end side 12C to the front (near part) of the front end 5E of the end plate 5D in the front and rear directions.

  Then, as shown in FIG. 3, the connecting pin 16 is inserted into each bush 15 of the arm boss 14 and the left and right brackets 12, and the retaining plate 18 is attached to the other end side of the connecting pin 16 using a bolt 19. In the attached state, the retaining plates 17 and 18 are fitted into the recessed portions 20, thereby restricting the connecting pin 16 from rotating about its axis and retaining the connecting pin 16 in the axial direction. It is the composition to do.

  In this case, since the plate thickness t of each retaining plate 17, 18 is set smaller than the plate thickness T of the reinforcing plate 13 in which the recessed recess 20 is formed, each retaining plate 17, 18 is recessed. It immerses in the recessed part 20 in the state fitted to the recessed part 20. Accordingly, the retaining plates 17 and 18 do not protrude from the outer side surface 13C of the reinforcing plate 13, and as shown in FIG. 5, for example, a hydraulic hose 21 and a greasing hose 22 that extend from the boom 5 toward the arm 6 are provided. And the like can be prevented from coming into contact with the retaining plates 17 and 18. Further, the heads of the respective bolts 19 for fixing the retaining plate 18 to the connecting pins 16 are also inserted into the recessed portions 20, and the heads of the bolts 19 are connected to the hydraulic hose 21, the above-described supply. It is the structure which can prevent contacting with the oil hose 22 grade | etc.,.

  Further, as shown in FIGS. 2 and 3, the end plate 5 </ b> D of the bracket 12 is extended by extending the recessed portion 20 of the reinforcing plate 13 from the front end side of the bracket 12 to the front of the end plate 5 </ b> D of the boom 5. The strength of the portion located on the tip side is slightly reduced. However, when an external force is applied to each bracket 12 via the connecting pin 16, a portion of each bracket 12 on the tip side of the end plate 5D is appropriately deformed, and accordingly, the bracket 12 and the end plate 5D are correspondingly deformed. The stress acting on the joint portion 5F is reduced, and the strength of the joint portion 5F can be maintained.

  The bearing device 11 according to the present embodiment has the above-described configuration. When the arm 6 is attached to the distal end side of the boom 5 by the bearing device 11, the bearing device 11 is provided on the distal end side of the boom 5 as shown in FIG. An arm boss 14 provided on the arm 6 is disposed between the left and right brackets 12.

  Next, the other end side of the connecting pin 16 to which the retaining plate 17 is fixed to one end side is inserted into the bushing 15D of the arm boss 14 and the pin insertion of the other bracket 12 from the pin insertion hole 12D of one bracket 12. It is inserted into the hole 12D. Then, the retaining plate 17 is brought into contact with the outer side surface 12 </ b> B of the bracket 12 while the retaining plate 17 is fitted in the recessed portion 20 provided on one reinforcing plate 13.

  Next, a bolt 19 is inserted into the bolt insertion hole 18 </ b> C of the retaining plate 18, and this bolt 19 is screwed into a female screw hole 16 </ b> A formed on the other end side of the connecting pin 16. As a result, the retaining plate 18 is fixed to the other end side of the connecting pin 16 while fitting into the recessed portion 20 provided in the other reinforcing plate 13. In this way, each bracket 12 provided on the distal end side of the boom 5 and the arm boss 14 provided on the arm 6 can be rotatably connected via the connecting pin 16.

  Thus, the retaining plate 17 provided on one end side of the connecting pin 16 and the retaining plate 18 provided on the other end side of the connecting pin 16 abut against the outer surface 12B of the bracket 12, respectively. The connection pins 16 can be retained in the axial direction by the retaining plates 17 and 18. Further, each retaining plate 17, 18 is fitted into a recessed portion 20 formed in each reinforcing plate 13, whereby the connecting pin 16 can be stopped around its axis.

  In this case, as shown in FIG. 3, the plate thickness t of each retaining plate 17, 18 is set to be smaller than the plate thickness T of the reinforcing plate 13 in which the recessed portion 20 is formed. The plates 17 and 18 are immersed in the recessed portion 20 in a state of being fitted to the recessed portion 20. Accordingly, the retaining plates 17 and 18 do not protrude from the outer side surface 13 </ b> C of the reinforcing plate 13. As a result, for example, as shown in FIG. 5, the hydraulic hose 21, the greasing hose 22 and the like extending from the boom 5 toward the arm 6 are reliably prevented from coming into contact with the retaining plates 17, 18, and these hydraulic hoses 21 and the greasing hose 22 can be protected.

  Moreover, as the structure which forms the recessed part 20 which penetrates this in each board | plate thickness direction in each reinforcement board 13, and fits each retaining plate 17 and 18 provided in the connection pin 16 to these each recessed part 20 Yes. For this reason, for example, compared with the case where a rotation restricting member for restricting the rotation of the retaining plate is provided on the outer surface of the reinforcing plate, in the present embodiment, there is no member projecting outside from the outer surface 13C of the reinforcing plate 13. . Thereby, the hydraulic hose 21, the greasing hose 22 and the like do not come into contact with the members protruding outward from the outer surface 13C of the reinforcing plate 13, and the hydraulic hose 21, the greasing hose 22 and the like can be protected. .

  Further, since the retaining plates 17 and 18 are fitted to the recessed portions 20 provided in each reinforcing plate 13, it is not necessary to create a rotation restricting member made of a member different from the reinforcing plate, for example. There is no need to fix the member to the reinforcing plate by means such as welding. As a result, the bearing device 11 according to the present embodiment can contribute to a reduction in the number of parts and an assembly man-hour.

  Furthermore, since the recessed portion 20 of the reinforcing plate 13 extends from the front end side of the bracket 12 to the front of the end plate 5D of the boom 5, a portion of the bracket 12 that is positioned on the front end side of the end plate 5D. The strength of is reduced. However, when an external force is applied to each bracket 12 via the connecting pin 16, a portion of each bracket 12 on the tip side of the end plate 5D is appropriately deformed. As a result, since the stress acting on the joint 5F between the bracket 12 and the end plate 5D can be reduced and the strength of the joint 5F can be maintained, the rigidity of the entire boom 5 including the bracket 12 can be increased.

  In the above-described embodiment, the case where the retaining plate 17 is provided on one end side of the connecting pin 16 and the retaining plate 18 is provided on the other end side is illustrated. However, the present invention is not limited to this. For example, as in the first modification shown in FIG. 6, the retaining plate 17 is provided only on one end side of the connecting pin 16, and only one of the reinforcing plates 13 is provided. It is good also as a structure which provides the recessed hollow part 20. As shown in FIG. In this case, the connecting pin 16 can be prevented from being pulled out and stopped by fixing the small diameter portion 17B of the retaining plate 17 to the bracket 12 using a bolt 35 or the like. The same applies to the retaining plate 32 according to the second embodiment.

  Moreover, in embodiment, the case where the recessed part 20 provided in the reinforcement board 13 is formed as a long groove hole which penetrates the reinforcement board 13 in a plate | board thickness direction is illustrated. However, the present invention is not limited to this. For example, as in the second modified example shown in FIG. 7, the bottomed concave portions 31 corresponding to the outer shapes of the retaining plates 17 and 18 are formed. Also good. In this case, a pin insertion hole 31A is formed at the bottom of the recessed portion 31, and the retaining plates 17 and 18 are inserted into the recessed portion 31 in a state where the connecting pin 16 is inserted into the pin insertion hole 31A. By fitting, the outer side surfaces of the retaining plates 17, 18 can be arranged on substantially the same plane as the outer side surface 13 </ b> C of the reinforcing plate 13.

  Moreover, in embodiment, the case where the securing plate 17 is integrally fixed to the one end side of the connection pin 16 by welding is illustrated. However, the present invention is not limited to this, and may be configured to be detachably attached to one end side of the connecting pin 16 using a bolt or the like, for example, similarly to the retaining plate 18.

  Furthermore, in embodiment mentioned above, the bearing apparatus 11 used for the pin coupling | bond part of the boom 5 and the arm 6 which comprise the working apparatus 4 of the hydraulic shovel 1 is illustrated. However, the present invention is not limited to this. For example, a pin coupling portion between the upper swing body 3 and the boom 5, a pin coupling portion between the arm 6 and the bucket 7, etc. It can be widely applied.

1 is a front view showing a hydraulic excavator to which a bearing device according to a first embodiment of the present invention is applied. It is a front view which shows the bearing apparatus applied to the pin coupling | bond part of a boom and an arm. FIG. 3 is a cross-sectional view of a connecting pin, a retaining plate, a reinforcing plate, a recessed portion, and the like as viewed from the direction of arrows III-III in FIG. It is a disassembled perspective view which shows a bracket, a connection pin, a retaining plate, a reinforcing plate, a recessed part, etc. It is a front view which shows the positional relationship of the bearing apparatus applied to the pin coupling | bond part of a boom and an arm, a hydraulic hose, etc. FIG. It is sectional drawing of the same position as FIG. 3 which shows the 1st modification which provided the retaining plate only in the one end side of the connection pin. It is sectional drawing of the same position as FIG. 3 which shows the 2nd modification which provided the bottomed recessed part in the reinforcement board.

Explanation of symbols

1 Excavator (construction machine)
2 Lower traveling body (car body)
3 Upper swing body (car body)
4 Working device 5 Boom (one side member)
5D End plate 5E Tip 6 Arm (other side member)
DESCRIPTION OF SYMBOLS 11 Bearing apparatus 12 Bracket 12B Outer side surface 12C Tip side 13 Reinforcement plate 14 Arm boss (boss member)
16 Connecting pin 17, 18 Retaining plate (Retaining plate)
20, 31 depression

Claims (5)

A pair of brackets provided on one side member facing each other, a reinforcing plate provided on the outer side surface of the tip end side for reinforcing the tip end side of the bracket, and disposed between the brackets provided on the other side member In a bearing device comprising: a boss member to be connected; and a connecting pin that connects the boss member and each bracket so as to be relatively rotatable,
At least one axial end side of the connecting pin is provided with a retaining plate portion for retaining the connecting pin in the axial direction with respect to the bracket,
A bearing device, wherein the reinforcing plate is provided with a recessed portion into which the retaining plate portion is fitted by notching a portion where the retaining plate portion is disposed.   2. The bearing device according to claim 1, wherein the retaining plate portion is configured to prevent the connection pin from being removed from the bracket and to prevent the connection pin from rotating around the axis of the bracket.   The said retaining plate part is set as a thickness dimension smaller than the thickness dimension of the said reinforcement board, and becomes a structure which immerses in the said recessed part when it fits into the said recessed part. The bearing device described. Each bracket is joined to an end plate constituting the tip of the one side member and protrudes forward of the end plate,
The bearing device according to claim 1, 2 or 3, wherein the recessed portion is configured to extend from a front end side of the bracket to a position before the end plate.   The one side member is a boom whose base end side is rotatably attached to a vehicle body of a construction machine, and the other side member is an arm rotatably attached to a distal end side of the boom. , 3 or 4 bearing device.

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