JP5679209B2 - Bearing device - Google Patents

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. In addition, a plate-like flange portion that normally prevents the connecting pin from being pulled out in the axial direction with respect to the bracket and at the end of the connecting pin in the axial direction is provided to stop the connecting pin from rotating around the shaft. Then, the restriction plate piece is fitted into the inside of the long hole provided in the flange, and the rotation of the connecting pin is restricted by contacting the inner side surface of the long hole and the side surface of the restriction plate piece (for example, , See Patent Document 1).

JP 2000-65037 A

  By the way, in the bearing apparatus by patent document 1 mentioned above, it is set as the structure which supports the rotational force of a connection pin with the control board piece contact | abutted to the inner surface of a long hole. For this reason, when the inner surface of the elongated hole comes into contact with the end surface of the regulating plate piece due to the rotational force of the connecting pin, stress is concentrated at the corners of the elongated hole. Therefore, in order to ensure the strength of the collar portion, it is necessary to set a large dimension in the width direction of the collar portion sandwiching the elongated hole. On the other hand, in order to suppress the surface pressure between the end face of the restricting plate piece and the inner side surface of the elongated hole that are in contact with each other, it is necessary to set a large size in the length direction of the restricting plate piece and the elongated hole. As a result, there is a problem in that the entire collar becomes large and is liable to be restricted in production such as defects in processing and assembly.

  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 reliably regulate the rotation of the connecting pin without enlarging the collar portion. is there.

  The bearing device according to the present invention includes 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 pair of brackets, and the boss member and each bracket. A coupling pin that is fitted and coupled so as to be rotatable relative to each other, and a rotation restricting mechanism that regulates rotation of the coupling pin with respect to the bracket are provided.

In order to solve the above-described problem, the feature of the configuration of the invention of claim 1 is that the rotation restricting mechanism has a female hole attached to the outer surface of one of the pair of brackets. And a plate fixed to an end of the one of the connecting pins on the bracket side and extending in a longitudinal direction intersecting the axial direction of the connecting pin , and having end surfaces on both the inner side surface, the outer side surface, and the width direction. A flange part formed as a body, a protrusion insertion hole that is drilled so as to open on the inner surface and the outer surface of the flange part , and a flat plate part that faces the outer surface of the flange part with a fitting hole fitted to the projection is formed, the abutting portion which abut against the end face of both sides in the width direction of the front Kitsuba portion restricting the rotation of said connecting pin is formed in said plate Stopper member and front through the fitting hole of the stopper member By fitting the female holes of the protrusions lies in the structure by the retaining member for retaining fit the stopper member.

The invention according to claim 2, wherein the flange portion is made of one longitudinal end side rectangular shape the protrusion insertion hole secured to the other end to the connecting pin is bored in the plate member, the stopper member, The flat plate portion made of a rectangular plate body extending in the width direction of the flange portion and having the fitting hole formed in the central portion thereof, and provided on the flat plate portion so as to face each other, the flange portions from both sides in the width direction. It is constituted by a pair of the contact portions sandwiched.

The invention according to claim 3, wherein the flange portion is made of one longitudinal end side rectangular shape the protrusion insertion hole secured to the other end to the connecting pin is bored in the plate member, the stopper member, A first flat plate portion that faces the flange portion and has a first fitting hole formed therein, and a first contact portion that is provided on the first flat plate portion and is in contact with one end surface in the width direction of the flange portion. first divided stopper member and the second flat plate portion and the flange provided on the flat portion of the second of the second fitting hole facing the flange portion is formed, which is formed more L-shape the other end face in the width direction of the parts consists of a second divided stopper member formed more L-shape second abutment portion which abuts the said flange portion first divided stopper member and the second The split stopper member is overlaid, and the retaining member is inserted into the female projection through the first fitting hole and the second fitting hole. It lies in the fact that is configured to be fitted in.

According to the first aspect of the present invention, the rotational force of the connecting pin can be supported by bringing the contact portion of the stopper member into contact with the end surfaces on both sides in the width direction of the flange portion. For this reason, the rotational force of the connecting pin does not act on the inner side surface of the protrusion insertion hole provided in the flange, and stress does not concentrate on the corners of the protrusion insertion hole. As a result, it is possible to reduce the widthwise dimension of the collar portion sandwiching the protrusion insertion hole while ensuring sufficient strength against the rotational force of the connecting pin. In addition, since the projection insertion hole formed in the collar portion can have a small diameter enough to fit on the outer periphery of the projection attached to one bracket, the inner surface of the projection insertion hole and the end of the collar portion The width dimension between the parts can be sufficiently secured, and the strength of the collar part can be increased. In addition, by causing the contact portion of the stopper member to widely contact the end surface of the flange portion in the length direction, the surface pressure acting on the contact portion of the stopper member is dispersed by dispersing the rotational force of the connecting pin. Can be lowered. Accordingly, the size of the collar portion can be reduced while reliably supporting the rotational force of the connecting pin, so that the degree of freedom in design can be increased.

  According to invention of Claim 2, a collar part can be inserted | pinched from the both sides of the width direction by a pair of contact part of a stopper member. For this reason, even when the connecting pin rotates in either the clockwise direction or the counterclockwise direction, the rotational force of the connecting pin can be reliably supported by the pair of contact portions. In addition, since the rotational force in both directions of the connecting pin can be supported using a single stopper member having a pair of contact portions, the stopper member can be easily attached to the protrusion provided on one bracket.

  According to the invention of claim 3, since the stopper member is divided into two members, the first divided stopper member and the second divided stopper member, and formed into an L shape, each divided stopper member can be processed. It becomes easy and size reduction of each division | segmentation stopper member can be achieved.

1 is a front view showing a hydraulic excavator to which a bearing device according to a first embodiment 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. It is sectional drawing which looked at the connection pin, the rotation control mechanism, etc. from the direction of arrows III-III in FIG. It is principal part expanded sectional drawing of the rotation control mechanism etc. in FIG. It is a principal part expanded sectional view which looked at the rotation control mechanism etc. from the arrow VV direction in FIG. It is a disassembled perspective view which shows a bracket, a connection pin, a rotation control mechanism, etc. It is a disassembled perspective view which shows the bracket by 2nd Embodiment, a connection pin, a rotation control mechanism, etc. It is a principal part expanded sectional view similar to FIG. 5 by 2nd Embodiment. It is a disassembled perspective view which shows the bracket by the 3rd Embodiment, a connection pin, a rotation control mechanism, etc. It is a disassembled perspective view similar to FIG. 6 which shows the stopper member by a 1st modification. It is a disassembled perspective view which shows the case where a bearing apparatus is provided in a bracket and a boom boss | hub as a 2nd modification.

  Hereinafter, a bearing device according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 11 by taking as an example a case where the bearing device is applied to a hydraulic excavator. First, FIG. 1 thru | or FIG. 6 has shown the bearing apparatus by 1st Embodiment.

  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.

  The boom 5 as one side member includes a left and right web 5A (only one on the left side) facing in the left and right directions, an upper flange plate 5B welded to the upper end side of each web 5A, and each web. The lower flange plate 5C welded to the lower end side of 5A forms a strong rectangular tube shape and extends 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.

  Incidentally, 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 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 bracket 12, the right bracket 13, the arm boss | hub 14, the connection pin 16, and the rotation control mechanism 17 etc. which are mentioned later.

  Reference numeral 12 denotes a left bracket provided on the tip side of the boom 5. The left bracket 12 includes a left bracket main body 12A formed in a substantially triangular flat plate shape using a thick steel plate material and the like, and a left bracket reinforcing plate 12B joined to the left bracket main body 12A by welding. ing.

  The left bracket body 12A is joined to the end plate 5D of the boom 5 and the left web 5A by welding. Thereby, the front end side of the left bracket 12 protrudes forward from the joint portion 5E with the end plate 5D.

  Further, the left bracket reinforcing plate 12B is formed in a substantially rectangular flat plate shape using a thick steel plate material or the like, thereby reinforcing the distal end side of the left bracket 12 into which a connecting pin 16 described later is inserted, The rigidity is increased.

  Here, a pin insertion hole 12 </ b> C into which a later-described connecting pin 16 is inserted is formed on the distal end side of the left bracket 12. And as shown in FIG. 6, the protrusion 18 mentioned later is provided in the outer surface 12D of the left bracket 12 (left bracket reinforcement board 12B).

  Reference numeral 13 denotes a right bracket that is provided on the front end side of the boom 5 and faces the left bracket 12. Similarly to the left bracket 12, the right bracket 13 is also formed of a thick steel plate or the like, and a right bracket body 13A formed in a substantially triangular flat plate shape, and a right bracket reinforcement joined to the right bracket body 13A by welding. It is comprised by the board 13B.

  The right bracket body 13A is joined to the end plate 5D of the boom 5 and the right web 5A by welding. Thereby, the front end side of the right bracket 13 protrudes forward from the joint portion 5E with the end plate 5D.

  Further, the right bracket reinforcing plate 13B is formed in a substantially rectangular flat plate shape using a thick steel plate material or the like, thereby reinforcing the distal end side of the right bracket 13 into which a connecting pin 16 described later is inserted, The rigidity is increased. Here, a pin insertion hole 13 </ b> C into which a later-described connecting pin 16 is inserted is formed on the distal end side of the right bracket 13.

  An arm boss 14 to be described later is disposed between the left bracket body 12A of the left bracket 12 and the right bracket body 13A of the right bracket 13. On the other hand, a left bracket reinforcement plate 12B is fixed to the opposite side of the left bracket 12 to the arm boss 14 by welding or the like. Similarly, a right bracket reinforcement plate on the opposite side of the right bracket 13 to the arm boss 14 is fixed. 13B is fixed by welding or the like.

  Reference numeral 14 denotes an arm boss as a boss member provided on the base end side of the arm 6 serving as the other side member. The arm boss 14 is disposed between the left bracket 12 and the right bracket 13. Here, the arm boss 14 has a cylindrical shape extending in the left and right directions. A cylindrical bush 15 that slidably supports a connecting pin 16 described below 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 that connects the arm boss 14, the left bracket 12, and the right bracket 13 so as to be relatively rotatable. The connecting pin 16 includes a bush 15 provided on the arm boss 14, as shown in FIG. The bracket 12 is inserted into the pin insertion hole 12 </ b> C and the pin insertion hole 13 </ b> C of the right bracket 13. The connecting pin 16 is always in sliding contact with the inner peripheral surface of the bush 15, and rotatably supports the arm boss 14 between the left bracket 12 and the right bracket 13. Further, a flange portion 19 described later is fixedly provided on one end side in the axial direction of the connecting pin 16.

  Next, the rotation restricting mechanism 17 used in the first embodiment will be described. The rotation restricting mechanism 17 is provided between the left bracket 12 and the connecting pin 16 and restricts the connecting pin 16 from rotating with respect to the left bracket 12 and the right bracket 13. The rotation restricting mechanism 17 is generally constituted by a projection 18, a flange 19, a stopper member 21, a retaining member 22 and the like which will be described later.

  18 is a protrusion with a female hole attached to the outer surface 12D of the left bracket 12, and the protrusion 18 protrudes from the outer surface 12D of the left bracket reinforcing plate 12B constituting the left bracket 12, as shown in FIG. Has been. Here, the protrusion 18 has a stepped cylinder by a large diameter portion 18A fixed by welding to the outer surface 12D of the left bracket 12 (left bracket reinforcing plate 12B) and a small diameter portion 18B having a smaller diameter than the large diameter portion 18A. A female screw portion 18C as a female hole is provided on the inner peripheral side of the small diameter portion 18B. 4 and 5, the height dimension H1 of the small-diameter portion 18B is slightly smaller than the sum of the thickness dimension of the flange portion 19 described later and the thickness dimension of the flat plate portion 21A of the stopper member 21. Is set to be large.

  Reference numeral 19 denotes a flange that is fixed to the end of the connecting pin 16 on the left bracket 12 side and extends in a direction intersecting the axial direction of the connecting pin 16. The flange portion 19 is formed as a rectangular plate having an inner side surface 19A, an outer side surface 19B, an upper end surface 19C, a lower end surface 19D, a front end surface 19E, and a rear end surface 19F. A pin insertion hole 19G is formed on one end side in the longitudinal direction of the flange portion 19, and one end side of the connection pin 16 is inserted into the pin insertion hole 19G and welded. A flange 19 is integrally fixed to one end side of 16. Further, a protrusion insertion hole 20 described later is provided on the other end side in the longitudinal direction of the flange portion 19.

  Reference numeral 20 denotes a protrusion insertion hole that is drilled in the flange portion 19 and into which the protrusion 18 is inserted. The protrusion insertion hole 20 passes through the flange portion 19 in the plate thickness direction and is provided at a position corresponding to the protrusion 18. . Here, the protrusion insertion hole 20 has a width dimension slightly larger than the outer diameter dimension of the small diameter portion 18B of the protrusion 18 and is formed in a long hole shape extending in the length direction of the flange portion 19. Then, the small-diameter portion 18B of the protrusion 18 is inserted into the protrusion insertion hole 20 in a state where the left bracket 12, the right bracket 13, and the arm boss 14 are connected by the connecting pin 16.

  Next, the stopper member used in the first embodiment will be described.

  Reference numeral 21 denotes a stopper member provided between the flange portion 19 of the connecting pin 16 and the protrusion 18 of the left bracket 12, and the stopper member 21 restricts the rotation of the connecting pin 16. Here, the stopper member 21 faces the flange portion 19 and is formed in a flat plate portion 21A made of a rectangular plate extending in the width direction, and a small diameter portion 18B of the protrusion 18 is formed in the central portion of the flat plate portion 21A. And a fitting hole 21B to be fitted to each other, and both ends of the flat plate portion 21A in the lengthwise direction with the fitting hole 21B interposed therebetween, and are in contact with the upper end surface 19C and the lower end surface 19D of the flange portion 19 A pair of contact portions 21C and 21D are formed. That is, the stopper member 21 is formed as a U-shaped plate body as a whole by the flat plate portion 21A in which the fitting hole 21B is formed and the pair of contact portions 21C and 21D.

  Then, with the flat plate portion 21 </ b> A of the stopper member 21 in contact with the outer side surface 19 </ b> B of the flange portion 19, the contact portion 21 </ b> C of the stopper portion 21 is brought into contact with the upper end surface 19 </ b> C of the flange portion 19. By bringing the contact portion 21D into contact with the lower end surface 19D of the flange portion 19, the flange portion 19 is sandwiched from both sides in the width direction by the pair of contact portions 21C and 21D. Thereby, when the connecting pin 16 rotates with respect to the left and right brackets 12 and 13, the upper end surface 19 </ b> C and the lower end surface 19 </ b> D of the flange portion 19 abut on the abutting portions 21 </ b> C and 21 </ b> D of the stopper member 21. As a result, the rotation of the connecting pin 16 is restricted.

  Reference numeral 22 denotes a retaining member that is fitted into the female hole (female screw portion 18C) of the protrusion 18 through the fitting hole 21B of the stopper member 21, and the retaining member 22 prevents the stopper member 21 from being removed. is there. Here, the retaining member 22 has a disk shape larger in diameter than the fitting hole 21B of the stopper member 21, and includes a presser plate 22A having a bolt insertion hole 22A1 formed in the center, and a bolt of the presser plate 22A. The mounting bolt 22B is configured to be screwed into the female screw portion 18C of the protrusion 18 through the insertion hole 22A1 and prevent the stopper member 21 from being pulled out from the small diameter portion 18B of the protrusion 18. Then, as shown in FIGS. 4 to 6, with the holding plate 22A in contact with the flat plate portion 21A of the stopper member 21, the shaft portion of the mounting bolt 22B is inserted into the bolt insertion hole 22A1 of the holding plate 22A, The presser plate 22A is fixed to the protruding end portion of the protrusion 18 (small diameter portion 18B) by being screwed into the female screw portion 18C of the protrusion 18. Thereby, the stopper member 21 and the connecting pin 16 can be prevented from being removed in the axial direction.

  The bearing device 11 according to the first embodiment has the above-described configuration, and the case where the arm 6 is attached to the front end side of the boom 5 by the bearing device 11 will be described.

  First, the arm boss 14 provided on the arm 6 is disposed between the left bracket 12 and the right bracket 13 provided on the distal end side of the boom 5.

  Next, from the pin insertion hole 12C of the left bracket 12, the other end side of the connecting pin 16 to which the flange portion 19 is fixed on one end side is connected to each bush 15 of the arm boss 14 and the pin insertion hole 13C of the right bracket 13. And insert. Then, the projection insertion hole 20 provided in the flange portion 19 is inserted into the small diameter portion 18B of the projection 18 provided on the outer surface 12D of the left bracket 12 (left bracket reinforcing plate 12B).

  Next, while fitting the fitting hole 21B of the stopper member 21 into the small diameter portion 18B of the protrusion 18, the flange portion 19 is sandwiched from both sides in the width direction by the pair of contact portions 21C and 21D of the stopper member 21, The flat plate portion 21A of the stopper member 21 is brought into contact with the outer side surface 19B of the flange portion 19.

  Then, the fixing bolt 22B is inserted into the bolt insertion hole 22A1 of the presser plate 22A, and the fixing bolt 22B is screwed into the female screw portion 18C of the protrusion 18, whereby the presser plate is fitted to the protruding end of the protrusion 18 (small diameter portion 18B). 22A is fixed.

  In this way, the left bracket 12 and the right bracket 13 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.

  At this time, when the arm 6 rotates with respect to the boom 5, a force (rotational force) is applied to the connecting pin 16 so as to rotate about the axis. On the other hand, in 1st Embodiment, each contact part 21C, 21D provided in the stopper member 21 contact | abuts the end surface of the collar part 19, and regulates the rotation of the connection pin 16 around the axis line. Can do. Specifically, the contact portion 21 </ b> C of the stopper member 21 contacts the upper end surface 19 </ b> C of the flange portion 19, whereby the counterclockwise rotation of the connecting pin 16 can be restricted. On the other hand, when the contact portion 21D of the stopper member 21 contacts the lower end surface 19D of the flange portion 19, the clockwise rotation of the connecting pin 16 can be restricted.

  Thus, according to the first embodiment, the stopper member 21 provided with the pair of contact portions 21C and 21D that sandwich the flange portion 19 of the connecting pin 16 from both sides in the width direction is used. The abutting portions 21C and 21D support the force (rotational force) to be rotated by abutting against the end surfaces (the upper end surface 19C and the lower end surface 19D) of the flange portion 19. For this reason, the rotational force of the connecting pin 16 does not act on the inner side surface of the projection insertion hole 20 formed in the flange portion 19, and stress does not concentrate on the corners of the projection insertion hole 20. Further, the protrusion insertion hole 20 provided in the flange portion 19 can be formed to have a small hole diameter so that the small diameter portion 18B of the protrusion 18 can be fitted. As a result, the width dimension L1 between the inner side surface of the projection insertion hole 20 provided in the flange portion 19 and the upper end surface 19C of the flange portion 19 is set small, and similarly, the inner side surface of the projection insertion hole 20 and the flange portion 19 are also set. The width dimension L2 between the lower end surface 19D and the lower end surface 19D can be set small. As a result, the width dimension L of the flange portion 19 can be reduced while ensuring sufficient strength against the rotational force of the connecting pin 16, and the size of the flange portion 19 can be reduced. Can be increased.

  Next, FIGS. 7 and 8 show a second embodiment of the present invention. The feature of this embodiment is that the stopper member is divided into a first divided stopper member and a second divided stopper member. It is to have done. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  Reference numeral 31 denotes a protrusion 31 used in place of the protrusion 18 according to the first embodiment. The protrusion 31 has a large-diameter portion 31A fixed to the outer surface 12D of the left bracket 12 (left bracket reinforcing plate 12B) by welding in the same manner as the protrusion 18 according to the first embodiment, and is larger than the large-diameter portion 31A. The small diameter portion 31B is formed in a stepped cylindrical shape, and a female screw portion 31C as a female hole is provided on the inner peripheral side of the small diameter portion 31B. And as shown in FIG. 8, the height dimension H2 of the small diameter part 31B is larger than the height dimension H1 of the small diameter part 18B of the protrusion 18 by 1st Embodiment, and the collar part 19 and the 1st mentioned later The split stopper member 32 and the second split stopper member 33 are set slightly larger than the total thickness.

  Reference numeral 32 denotes a first split stopper member used in place of the stopper member 21 according to the first embodiment. The first split stopper member 32 includes a rectangular first flat plate portion 32A facing the outer side surface 19B of the flange portion 19 and a first fitting hole 32B formed in the first flat plate portion 32A. The first flat plate portion 32A is bent from the upper end side in the longitudinal direction toward the flange portion 19 side, and comes into contact with one side end surface (upper end surface 19C) in the width direction of the flange portion 19. And is formed by. Thus, the first division stopper member 32 is formed as an L-shaped plate body by the first flat plate portion 32A and the first contact portion 32C.

  Reference numeral 33 denotes a second split stopper member used in place of the stopper member 21 according to the first embodiment. The second split stopper member 33 includes a rectangular second flat plate portion 33A facing the outer surface 19B of the flange portion 19 and a second fitting hole 33B formed in the second flat plate portion 33A. And a second contact portion 33C that bends from the lower end side in the longitudinal direction of the second flat plate portion 33A toward the flange portion 19 side and contacts the other side end surface (lower end surface 19D) of the flange portion 19 in the width direction. And is formed by. Thus, the second division stopper member 33 is formed as an L-shaped plate body by the second flat plate portion 33A and the second contact portion 33C.

  34 is fitted into the female hole (female screw portion 31C) of the projection 31 through the first fitting hole 32B of the first divided stopper member 32 and the second fitting hole 33B of the second divided stopper member 33. The retaining member is shown. The retaining member 34 retains the first split stopper member 32 and the second split stopper member 33. Here, the retaining member 34 has a disk shape larger in diameter than the first fitting hole 32B and the second fitting hole 33B, and a holding plate 34A in which a bolt insertion hole 34A1 is formed at the center. Then, the first split stopper member 32 and the second split stopper member 33 are secured against the small diameter portion 31B of the projection 31 by being screwed into the female thread portion 31C of the projection 31 through the bolt insertion hole 34A1 of the holding plate 34A. It is comprised with the attachment volt | bolt 34B.

  In the case of using the first divided stopper member 32 and the second divided stopper member 33 that are divided and formed in this way, the first flat plate portion 32A of the first divided stopper member 32 and the second divided stopper member The second flat plate portion 33 </ b> A of 33 is overlapped with the flange portion 19. In this state, the mounting bolt 34B is inserted into the bolt insertion hole 34A1 of the presser plate 34A of the retaining member 34, and the mounting bolt 34B is fitted to the female thread portion 31C of the protrusion 31 for mounting. At this time, the first contact portion 32C of the first division stopper member 32 is brought into contact with one side end surface (upper end surface 19C) of the flange portion 19 in the width direction. Thereby, the 1st division | segmentation stopper member 32 is comprised as what controls the rotation of the connecting pin 16 counterclockwise.

  On the other hand, the second contact portion 33C of the second split stopper member 33 is brought into contact with the other end surface (lower end surface 19D) in the width direction of the flange portion 19. Thus, the second split stopper member 33 is configured to restrict the clockwise rotation of the connecting pin 16.

  The rotation restricting mechanism according to the second embodiment uses a stopper member consisting of two members, a first divided stopper member 32 and a second divided stopper member 33. There is no particular difference from that of the first embodiment.

  However, according to the second embodiment, the first divided stopper member 32 and the second divided stopper member 33 constituting the stopper member can be configured as an L-shaped plate. For this reason, the processing of the first and second divided stopper members 32 and 33 is facilitated, and workability at the time of manufacture can be improved.

  Next, FIG. 9 shows a third embodiment of the present invention. The feature of the present embodiment is that the contact portion of the stopper member surrounds the upper end surface, the lower end surface, and the rear end surface of the collar portion. It is in providing. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  Reference numeral 41 denotes a stopper member used in place of the stopper member 21 according to the first embodiment. The stopper member 41 is formed in a flat plate portion 41A facing a region of the flange portion 19 where the projection insertion hole 20 is provided, and in a central portion of the flat plate portion 41A, and is fitted into the small diameter portion 18B of the projection 18. The joint hole 41B and the contact portions 41C, 41D, and 41E that protrude from the flat plate portion 41A toward the flange portion 19 are configured. Here, the contact portion 41C contacts the upper end surface 19C of the flange portion 19, and the contact portion 41D contacts the lower end surface 19D of the flange portion 19. The abutting portion 41E is an arc-shaped abutting portion that connects the abutting portions 41C and 41D, and abuts against the rear end surface 19F of the flange portion 19.

  Then, the flat plate portion 41A of the stopper member 41 is opposed to the outer side surface 19B of the flange portion 19 and the fitting hole 41B is fitted to the small diameter portion 18B of the projection 18 so as to be inserted into the holding plate 22A of the retaining member 22. The mounting bolt 22 </ b> B is screwed into the female screw portion 18 </ b> C of the protrusion 18. Accordingly, the contact portion 41C contacts the upper end surface 19C of the flange portion 19, the contact portion 41D contacts the lower end surface 19D of the flange portion 19, and the contact portion 41E contacts the rear end surface 19F of the flange portion 19. Touch. As described above, the stopper member 41 is attached so as to cover the protrusion insertion hole 20 side of the outer side surface 19B of the flange portion 19.

  The rotation restricting mechanism according to the third embodiment uses the stopper member 41 as described above, and the basic action is not different from that according to the first embodiment.

  However, according to the third embodiment, the contact portions 41C, 41D, and 41E of the stopper member 41 that supports the rotational force of the connecting pin 16 are formed on the upper end surface 19C, the lower end surface 19D, and the rear end surface 19F of the flange portion 19, respectively. Because of continuous contact, a wide contact area for supporting the rotational force of the connecting pin 16 can be secured. Thereby, since the rotational force of the connecting pin 16 can be dispersed, the surface pressure between the end surfaces 19C, 19D, 19F of the flange portion 19 and the contact portions 41C, 41D, 41E of the stopper member 41 is reduced. As a result, the collar portion 19 can be downsized.

  In the first embodiment described above, the flange portion 19 is illustrated as being formed as a substantially rectangular plate extending in the direction intersecting the axial direction of the connecting pin 16. However, the present invention is not limited to this, and for example, as in the flange portion 51 of the first modified example shown in FIG. 10, the dimension in the width direction sandwiching the protrusion insertion hole 51A may be formed small. In this case, not only can the collar portion 51 be downsized, but also the stopper member 52 that stops the collar portion 51 can be miniaturized, so that the degree of freedom in design can be further increased.

  Moreover, in 1st 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, as in the second modification shown in FIG. 11, the left and right vertical plates 3 </ b> A and 3 </ b> B of the revolving frame serving as the base of the upper revolving structure 3 and the boom 5 You may use for a pin coupling part. Further, the present invention can be widely applied to a pin coupling portion that couples two members in a rotatable manner, such as a pin coupling portion between the arm 6 and the bucket 7. The first modification and the second modification are the same for the second embodiment and the third embodiment.

  Further, in the first embodiment, the retaining member 22 is constituted by the pressing plate 22A and the mounting bolt 22B. However, the present invention is not limited to this example. For example, the holding bolt 22B is integrally provided with the holding plate 22A, or the outer diameter of the head of the mounting bolt 22B is fitted to the stopper member 21 without using the holding plate 22A. The stopper member 21 may be fixed by making it larger than the diameter of the hole 21B. The same applies to the second embodiment and the third embodiment.

  Furthermore, in each embodiment, the hydraulic excavator 1 was described as an example of the construction machine. However, the present invention is not limited to this, and can be widely applied to other construction machines such as wheel-type hydraulic excavators and cranes.

DESCRIPTION OF SYMBOLS 1 Hydraulic excavator 2 Lower traveling body 3 Upper turning body 5 Boom (one side member)
6 Arm (other side member)
11 Bearing device 12 Left bracket 13 Right bracket 14 Arm boss (boss member)
16 connecting pin 17 rotation restricting mechanism 18, 31 protrusion 19, 51 flange 20, 51A protrusion insertion hole 21, 41, 52 stopper member 21A, 41A flat plate portion 21B, 41B fitting hole 21C, 21D, 41C, 41D, 41E Contact part 22, 34 Detachment member 32 First division stopper member 32A First flat plate part 32B First fitting hole 32C First contact part 33 Second division stopper member 33A Second flat plate part 33B 2nd fitting hole 33C 2nd contact part

Claims (3)

A pair of brackets provided on one side member facing each other, a boss member provided on the other side member and disposed between the pair of brackets, and inserted between the boss member and each bracket and relatively rotated between the two. In a bearing device comprising a connecting pin that can be connected and a rotation restricting mechanism that restricts the connecting pin from rotating with respect to the bracket.
The rotation restricting mechanism is
A projection with a female hole attached to the outer surface of one of the pair of brackets;
Of the connecting pins, the plate is fixed to an end portion on the one bracket side and extends in a longitudinal direction intersecting the axial direction of the connecting pin , and is formed as a plate body having end surfaces on the inner surface, the outer surface, and both sides in the width direction. and the flange portions,
A projection insertion hole that is drilled so as to open to the inner side surface and the outer side surface of the collar portion and through which the projection is inserted;
With a fitting hole fitted to the projection the flat plate portion facing the outer surface of the flange portion is formed, the rotation of the connecting pin in contact with the end surfaces on both sides in the width direction of the front Kitsuba portion A stopper member formed on the flat plate portion with a regulating contact portion;
A bearing device comprising: a retaining member that retains the stopper member by being fitted into the female hole of the protrusion through the fitting hole of the stopper member. The flange portion is made of one longitudinal end side rectangular shape the protrusion insertion hole secured to the other end to the connecting pin is bored in the plate member,
The stopper member extends in the width direction of the flange portion and is provided with the flat plate portion formed of a rectangular plate body having the fitting hole formed in the center portion thereof, and the flat plate portion facing each other. The bearing device according to claim 1, comprising a pair of the contact portions sandwiched from both sides in the width direction. The flange portion is made of one longitudinal end side rectangular shape the protrusion insertion hole secured to the other end to the connecting pin is bored in the plate member,
The stopper member is provided on the first flat plate portion that faces the flange portion and has a first fitting hole formed therein, and a first flat plate portion that is provided on the first flat plate portion and abuts on one side end surface of the flange portion in the width direction. first divided stopper member and the second flat plate portion and the second flat plate portion in which the second fitting hole and facing said flange portion is formed, which is formed more L-shape abutment 1 consists of a second divided stopper member formed more L-shape second abutting portion abutting against the other end face in the width direction of the flange portion provided,
The first split stopper member and the second split stopper member are overlaid on the flange, and the retaining member is inserted into the female projection through the first fitting hole and the second fitting hole. The bearing device according to claim 1, wherein the bearing device is configured to be fitted into the hole.

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