JP2001207476A - Bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly perform assembling working and eliminate looseness between a connection pin and a bracket. SOLUTION: An upper side boss 12 is provided on an upper plate 4D constituting a turn frame 4, and a lower side boss 14 is provided on the front end of a bottom plate 4A. In addition, a swing post 16 arranges an upper side bracket 17 on a more upper side than the upper side boss 12, and the lower side bracket 18 is arranged between the upper side boss 12 and the lower side boss 14. An upper side connection pin 21 is provided to be projected downward on the upper side bracket 17, and slidably fitted to and inserted in an upper side bush 13. In addition, a lower side connection pin 22 is provided to be projected downward on the lower side bracket 18, and slidably fitted to and inserted in a lower side bush 15. Furthermore, a stopper 23 is provided on the upper end of the upper side connection pin 21, and the upper side connection pin 21 is held in the upper side bush 13 in a locked state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing device suitably used for a pin connecting portion between an upper revolving structure and a swing post or a pin connecting portion of a working device, which is mounted on a construction machine such as a hydraulic excavator.

[0002]

2. Description of the Related Art Generally, construction machines such as hydraulic excavators are
A lower traveling body and an upper revolving body rotatably mounted on the lower traveling body are provided, and a working device for excavating soil and the like is provided on the front side of the upper revolving body so as to be able to elevate. .

[0003] Also, among hydraulic excavators, a small excavator called a mini excavator is known which has a swing mechanism for swinging a working device left and right with respect to an upper revolving unit (for example, there is known a mini excavator). JP-A-11-93212
No.).

In this prior art, a swing post is rotatably connected to a front side of an upper swing body, and a boom base end of a working device is rotatably connected to the swing post. The working device swings left and right with respect to the upper swing body together with the swing post by a swing cylinder provided between the swing post and the upper swing body.

When performing a work such as digging a side ditch, the working device is swung left and right with respect to the upper revolving unit together with the swing post by the swing cylinder, and the upper revolving unit is swung by the swinging unit. The working device is moved in the left and right directions in parallel by turning by the same angle in the opposite direction to the direction, and the gutter digging work is performed in this state.

Here, a bearing device used for a pin connecting portion between the swing post and the turning frame includes, for example, an upper boss and a lower boss provided on the turning frame side, and an upper bracket serving as an attachment portion provided on the swing post side. , Lower bracket, and a connecting pin for connecting each boss and each bracket so as to be relatively rotatable with each other.

[0007]

In the bearing device according to the prior art described above, the lower boss provided on the revolving frame is divided into upper and lower parts, and a lower part of the swing post is provided between the pair of lower bosses. Because the brackets are arranged, when assembling the swing post, it is necessary to move the entire swing post horizontally so that the lower bracket on the swing post side is inserted between the pair of lower bosses on the swing frame. There is.

Therefore, when assembling the swing post, the operator pays attention so that the upper bracket and the lower bracket on the swing post side do not collide with the upper boss and the lower boss on the turning frame side. However, it is necessary to slowly move the swing post while keeping the entire swing post in the horizontal direction, and such a work is troublesome and there is a problem that workability is reduced.

When the connecting pins are inserted into the upper bracket, the lower bracket, the upper boss, and the lower boss after the swing post is moved in this manner, the upper bracket is not inserted until the operation of inserting the connecting pins is completed. It is necessary to keep the pin hole of the lower bracket and the pin hole of the lower bracket aligned with the upper boss and the lower boss, respectively. There is a problem.

Furthermore, in this prior art, since the connecting pin is merely prevented from rotating by fixing one end of the connecting pin to the bracket using a fixing bolt or the like, the connecting pin is attached to the bracket. On the other hand, it is difficult to maintain a completely fixed state, and for example, vibration occurs between the connecting pin and the bracket due to excavation reaction force generated during excavation work, and abrasion easily occurs between the two. is there.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to enable assembling work to be carried out smoothly, to improve workability, and to reduce the distance between the connecting pin and bracket. An object of the present invention is to provide a bearing device capable of preventing rattling, preventing the occurrence of wear and the like between the two, and improving performance, reliability and the like.

[0012]

In order to solve the above-mentioned problems, a bearing device according to the present invention is provided with an upper boss provided on one member and having an upper bush fitted on an inner peripheral side thereof. A lower boss provided below the boss and provided on the one member and having a lower bush fitted on an inner peripheral side thereof; and an upper side provided on the other member positioned above the upper boss and provided on the other member. A bracket, a lower bracket positioned between the upper boss and the lower boss, and provided on the other member, and slidably inserted into the upper bush provided to protrude downward from the upper bracket. An upper connecting pin that connects the upper boss and the upper bracket so as to be relatively rotatable by being fitted thereto, and is provided so as to protrude downward from the lower bracket and is slidably inserted into the lower bush. Said It is constituted by a lower connecting pins which relatively rotatably connected to the side bosses and the lower bracket.

With this configuration, when assembling one member with the other using the bearing device,
The upper bracket provided on the other member is disposed above the upper boss provided on the one member, and the lower bracket is disposed between the upper boss and the lower boss. Move down.

Since the upper bracket and the lower bracket are provided with an upper connecting pin and a lower connecting pin, respectively, projecting downward, the upper connecting pin is moved by moving the other member downward as described above. The lower connecting pin can be simultaneously inserted into the upper bush fitted to the upper boss and the lower bush fitted to the lower boss, respectively. In this state, the upper bracket and the lower bracket can be inserted into the upper boss. It can be rotatably connected to the lower boss.

Further, the bearing device according to the second aspect of the present invention
An upper bracket provided on one member, a lower bracket provided on the one member positioned below the upper bracket, and provided on the other member positioned above the upper bracket; An upper boss having an upper bush fitted on an inner peripheral side thereof, and a lower side provided between the upper bracket and the lower bracket and provided on the other member and having a lower bush fitted on an inner peripheral side thereof. A boss, an upper connecting pin provided to protrude upward from the upper bracket and slidably inserted into the upper bush to connect the upper bracket and the upper boss so as to be relatively rotatable; and the lower bracket. A lower connecting pin that is provided to protrude upward from and is slidably inserted into the lower bush to connect the lower bracket and the lower boss so as to be relatively rotatable. It is more configuration.

With this configuration, when assembling one member to another using the bearing device,
The upper boss provided on the other member is disposed above the upper bracket provided on the one member, and the lower boss is disposed between the upper bracket and the lower bracket. Move down.

Since the upper bracket and the lower bracket are provided with the upper connecting pin and the lower connecting pin projecting upward, respectively, as described above, the other member is moved downward to be fitted into the upper boss. The fitted upper bush and the lower bush fitted to the lower bush can be simultaneously inserted into the upper connecting pin and the lower connecting pin respectively. In this state, the upper boss and the lower boss are connected to the upper bracket and the lower bracket. It can be pivotally connected.

Further, in the invention of claim 3, the upper connecting pin is formed integrally with the upper bracket, and the lower connecting pin is formed integrally with the lower bracket. Thereby, the upper connection pin and the upper bracket can be formed as an integral structure, and the upper connection pin can be firmly integrated with the upper bracket. Also, the lower connecting pin and the lower bracket can be formed as an integral structure, and the lower connecting pin can be firmly integrated with the lower bracket.

According to a fourth aspect of the present invention, the upper connecting pin is fixed to the pin hole formed in the upper bracket by press fitting, and the lower connecting pin is fixed to the pin hole formed in the lower bracket by press fitting. And Even in this case, the upper connecting pin and the lower connecting pin are
It can be held in the pin hole of the lower bracket in a fixed state, respectively, and it is possible to prevent rattling between the upper connecting pin and the upper bracket and between the lower connecting pin and the lower bracket.

The invention according to claim 5 is configured such that the upper connecting pin is fixed to the upper bracket by welding, and the lower connecting pin is fixed to the lower bracket by welding. Also in this case, it is possible to mount the upper connection pin and the lower connection pin firmly fixed to the upper bracket and the lower bracket, respectively.

According to a sixth aspect of the present invention, the upper connecting pin is fixed to the upper bracket by using a fastener, and the lower connecting pin is fixed to the lower bracket by using another fastener. As a result, the upper connecting pin and the lower connecting pin can be detachably attached to the upper bracket and the lower bracket using the fasteners, and the upper connecting pin and the lower connecting pin can be easily replaced with new ones. can do.

Further, according to the invention of claim 7, a stopper is provided at the protruding end of the upper connecting pin so as to abut against the upper boss to hold the upper connecting pin in the upper bush in a retaining state. As a result, even when an upward or downward thrust load is applied to the bearing device, the stopper provided at the protruding end of the upper connecting pin abuts on the upper boss, so that there is a gap between one member and the other member. Up and down rattling can be prevented.

On the other hand, the bearing device according to the invention of claim 8 is:
An upper bracket provided on one member, a lower bracket provided on the one member positioned below the upper bracket, and provided on the other member positioned above the upper bracket; An upper boss having an upper bush fitted on an inner peripheral side thereof, and a lower side provided between the upper bracket and the lower bracket and provided on the other member and having a lower bush fitted on an inner peripheral side thereof. The upper bracket, the lower bracket, the upper boss, and the lower boss are inserted through the boss, the pin holes of the upper bracket and the pin holes of the lower bracket, and slidably inserted into the upper bush and the lower bush. And a connection pin for connecting the connection pins so as to be relatively rotatable, and a connection pin provided between the upper bracket and the connection pin and located between the upper bracket and the lower boss. It is constituted by a fixing means for fixing to the upper bracket.

With this configuration, when assembling one member to another using the bearing device,
The upper boss provided on the other member is disposed above the upper bracket provided on the one member, and the lower boss is disposed between the upper bracket and the lower bracket. Move down. Then, the pin hole of the upper bracket and the pin hole of the lower bracket are aligned with the upper bush fitted to the upper boss, and the lower bush fitted to the lower bush. By inserting the pin holes, the upper bush, and the lower bush, the upper boss and the lower boss can be rotatably connected to the upper bracket and the lower bracket.

The fixing means can be mounted between the upper bracket and the connecting pin by utilizing a space between the upper bracket and the lower boss. And the bearing device can be downsized in the upward and downward directions.

According to the ninth aspect of the present invention, the fixing means is constituted by a fixing bolt provided to penetrate the upper bracket and the connecting pin in the radial direction. As a result, the connecting pin is prevented from rotating with respect to the upper bracket by the fixing bolt,
In addition, the fixing bolt can be held in a stopped state, so that the fixing bolt can be easily attached.

According to a tenth aspect of the present invention, the fixing means includes a cylindrical collar member provided on the outer peripheral side of the connecting pin and fixed to the upper bracket, and the collar member and the connecting pin are radially connected to each other. It is constituted by a fixing bolt provided through. In this case, the outer peripheral side of the connection pin is covered from outside by the collar member, and the connection pin can be protected from impacts such as earth and sand.

Further, in the invention according to claim 11, a positioning portion is provided at the upper end of the connecting pin for positioning the connecting pin in the upper bush in the axial direction by contacting the upper boss. Thereby, at the time of assembling the bearing device, the positioning pin provided on the connecting pin is brought into contact with the upper boss by inserting the connecting pin downward from the upper bush toward the upper bracket, the lower bush, and the lower bracket. The connecting pin can be positioned in the upper bush in the axial direction, and in this state, the connecting pin can be easily fixed to the upper bracket using the fixing means.

Further, according to the twelfth aspect of the present invention, one member is constituted by a frame of a construction machine, and the other member is constituted by a swing post which swings a working device of the construction machine left and right. Thus, the swing post of the construction machine, which is the other member, can be connected to the frame of the construction machine, which is the one member, so as to be rotatable left and right, and the working device is integrated with the swing post on the front side of the frame. To swing smoothly left and right.

[0030]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a bearing device according to an embodiment of the present invention; FIG.

FIGS. 1 to 6 show a first embodiment of the present invention, wherein 1 is a lower traveling body of a hydraulic shovel, 2
Reference numeral denotes an upper revolving unit which is rotatably mounted on the lower traveling unit 1, and a working device 3 for excavating soil and the like is provided in front of the upper revolving unit 2.

Here, the working device 3 includes a boom 3A attached to the swing post 16 to be described later so as to be able to ascend, an arm 3B attached to the tip of the boom 3A so as to be able to ascend and descend, and This is roughly constituted by a bucket 3C rotatably attached to the distal end. Also,
A boom cylinder 3D is provided between the swing post 16 and the boom 3A, an arm cylinder 3E is provided between the boom 3A and the arm 3B, and a bucket cylinder 3F is provided between the arm 3B and the bucket 3C. Have been.

Reference numeral 4 denotes a revolving frame as one of the members constituting the frame of the upper revolving unit 2.
Is a flat bottom plate 4A, as shown in FIGS.
It is roughly constituted by left and right vertical plates 4B and 4C which are erected on the bottom plate 4A and extend forward and backward, and an upper plate 4D provided on the front upper side of the vertical plates 4B and 4C.

Here, the swing post 1 is attached to the bottom plate 4A and the upper plate 4D of the revolving frame 4 via a bearing device 11.
6 is rotatably mounted. The bearing device 11 includes an upper boss 12, a lower boss 14, an upper bracket 17, a lower bracket 18, and a connecting pin 2 which will be described later.
This is roughly constituted by 1 and 22.

Reference numeral 12 denotes an upper boss provided at the front end of the upper plate 4D of the revolving frame 4. The upper boss 12 is formed integrally with the upper plate 4D of the revolving frame 4, and the lower end thereof is formed on the upper plate 4D.
Projected downward by a certain dimension.

An upper bush 13 is fitted and fixed to the inner peripheral side of the upper boss 12.
For example, it is formed using a copper alloy, a resin material having self-lubricating properties, or the like, and the inner peripheral side thereof is a pin hole 13A.

A lower boss 14 is provided below the upper boss 12 and provided on the bottom plate 4A of the revolving frame 4. The lower boss 14 is formed integrally with the bottom plate 4A of the revolving frame 4 and has an upper end. The side protrudes upward from the bottom plate 4A by a certain dimension.

A lower bush 15 is fitted and fixed to the inner peripheral side of the lower boss 14. The lower bush 15 is also made of a copper alloy or a resin having self-lubricating properties, like the upper bush 13. It is formed using a material or the like, and its inner peripheral side is a pin hole 15A.

Reference numeral 16 denotes a swing post as the other member rotatably provided on the front side of the revolving frame 4. The swing post 16 is formed by casting, for example, as shown in FIGS. ing.

As shown in FIG. 5, the swing post 16 is provided with an upper bracket 17 and a lower bracket 18 which are separated from each other upward and downward. The upper bracket 17 is disposed above the upper plate 4 </ b> D of the turning frame 4, and is pin-connected to the upper boss 12.
Further, the lower bracket 18 is attached to the bottom plate 4 of the turning frame 4.
It is arranged between A and the upper plate 4D, and is pin-connected to the lower boss 14.

The swing post 16 is provided with left and right brackets 19, 19.
The boom 3A and the boom cylinder 3D of the working device 3 are respectively pin-connected between the nine. Further, another bracket 20 (see FIG. 2) is provided on the swing post 16, and a swing cylinder 26 described later is pin-connected to the bracket 20.

The swing post 16 is rotated left and right with respect to the revolving frame 4 by extending and retracting the swing cylinder 26, and the working device 3 is integrated with the swing post 16 on the front side of the upper revolving unit 2. To swing left and right.

Reference numeral 21 denotes an upper connecting pin (hereinafter referred to as a connecting pin) protruding from the upper bracket 17 of the swing post 16, and the connecting pin 21 is integrated with the upper bracket 17 of the swing post 16 by, for example, casting. It is formed as an object. The connecting pin 21 protrudes downward from the upper bracket 17 and is slidably inserted into the pin hole 13A of the upper bush 13 to rotatably connect the upper bracket 17 to the upper boss 12. is there.

Reference numeral 22 denotes a lower connecting pin (hereinafter referred to as a connecting pin) protruding from the lower bracket 18 of the swing post 16, and the connecting pin 22 is also connected to the lower side of the swing post 16 by means such as casting. It is formed integrally with the bracket 18. And this connecting pin 22
The lower bracket 18 protrudes downward from the lower bracket 18 and is slidably inserted into the pin hole 15A of the lower bush 15 to rotatably connect the lower bracket 18 to the lower boss 14.

Reference numeral 23 denotes a stopper which is detachably fixed to the connection pin 21. The stopper 23 is formed in a disk shape having an outer diameter larger than that of the connection pin 21, and is provided on the protruding end side of the connection pin 21. (At the lower end) using a bolt 24 or the like.

When a load in the thrust direction (up, down) is applied to the swing post 16, the stopper 23 receives the load in the thrust direction by contacting the upper boss 12, and Upper bush 1
3 is held in a retaining state, so that rattling between the turning frame 4 and the swing post 16 in the upward and downward directions is suppressed.

A washer 25 is provided on the outer peripheral side of the connecting pin 21 and provided between the upper boss 12 and the upper bracket 17. The washer 25 is made of, for example, a metal material having abrasion resistance and a self-lubricating property. It is formed annularly using a resin material or the like, and is configured as a thrust receiver that receives a load in the thrust direction between the upper boss 12 and the upper bracket 17.

The washer 25 prevents the upper bracket 17 from sliding directly on the upper boss 12 when the swing post 16 rotates, and reduces the sliding resistance between the upper boss 12 and the upper bracket 17. It is intended to keep the size of the swing post 16 small and compensate for the smooth rotation of the swing post 16.

On the other hand, as shown in FIG. 4, a small gap δ is formed between the lower boss 14 and the lower bracket 18 so that the lower bracket 18 slides directly on the lower boss 14. Is gone.

Reference numeral 26 denotes a swing cylinder provided between the revolving frame 4 and the bracket 19 of the swing post 16, as indicated by a chain line in FIG.

The bearing device 11 of the hydraulic shovel according to the present embodiment has the above-described configuration, and is connected to the front portion of the revolving frame 4 via the bearing device 11 when performing an operation such as digging a gutter. By rotating the swing post 16 left and right by the swing cylinder 26, the entire working device 3 swings left and right at the front side of the upper revolving unit 2 integrally with the swing post 16.

Then, in this state, the upper revolving unit 2 is turned by the same angle in the opposite direction to the swinging direction of the working device 3, so that the working device 3 moves in the left and right directions in parallel. The gutter digging work is performed by rotating the bucket 3C and the like.

Next, the swing post 16 is connected to the bearing device 11.
First, the upper bracket 17 of the swing post 16 is disposed above the upper boss 12 of the turning frame 4 as shown in FIG. Lower bracket 1
8 is arranged between the upper boss 12 and the lower boss 14.

Here, a gap between the upper boss 12 and the lower boss 14 that is sufficiently larger than the upper and lower wall thicknesses of the lower bracket 18 including the connecting pin 22 is ensured. The possibility that the swing post 16 collides with the upper boss 12 and the lower boss 14 on the turning frame 4 side can be eliminated.

In the state where the swing post 16 is arranged as described above, the swing post 16 is moved downward as shown by the arrow in FIG.
Pin holes 13A of upper bush 13
The upper bracket 17 and the lower bracket 18 are rotatably connected to the upper boss 12 and the lower boss 14 by being simultaneously inserted into the pin holes 15A of the inner and lower bushes 15, respectively.

Finally, the stopper 23 is connected to the connecting pin 2.
1, and the connecting pin 21 is retained in the pin hole 13A of the upper bush 13 in a retaining state.

Thus, in the present embodiment, when the swing post 16 is assembled, the swing post 16 is simply moved downward from above the revolving frame 4 toward the upper boss 12 and the lower boss 14. The connecting pins 21 and 22 are connected to the upper bush 13 without causing the swing post 16 to collide with the upper boss 12, the lower boss 14, and the like.
The inner bush 15 can be easily inserted and mounted in the lower bush 15, and the workability at the time of assembly can be improved.

Since the connecting pin 21 and the connecting pin 22 are formed integrally with the upper bracket 17 and the lower bracket 18 of the swing post 16, respectively, the connecting pin 21 and the connecting pin 22 are formed in the upper bush 13 as described above. When inserted into the lower bush 15, as described in the related art, it is not necessary to hold the upper bracket 17 and the lower bracket 18 in a state of being positioned with respect to the upper boss 12 and the lower boss 14, respectively. A laborious positioning operation can be omitted, and the burden on the operator can be reduced.

Further, since the connecting pin 21 and the connecting pin 22 are formed integrally with the upper bracket 17 and the lower bracket 18 of the swing post 16, respectively, the connecting pin 21 and the connecting pin 22 are connected to the upper bracket 17 and the lower bracket 17, respectively. It can be attached to the bracket 18 in a strongly integrated state.

As a result, rattling does not occur between the upper bracket 17 and the connecting pin 21 and between the lower bracket 18 and the connecting pin 22. And the durability of the connecting pins 21 and 22 and the brackets 17 and 18
Service life can be extended.

Further, since the swing post 16 according to the present embodiment has the structure in which the stopper 23 is provided at the lower end side of the connecting pin 21, for example, the stopper 23 is connected to the connecting pin 22.
As compared with the configuration provided on the lower end side of the upper surface, a large gap S in the upward and downward directions between the lower traveling structure 1 and the upper revolving structure 2 shown in FIG. Problems such as damage of the connecting pin 22 due to rocks or the like being caught in the gap S during the operation can be solved.

Then, in order to secure a constant gap S between the lower traveling structure 1 and the upper revolving structure 2, for example, the entire upper revolving structure 2 is moved upward from the position shown in FIG. It is not necessary to mount the upper revolving unit 2 at a higher position with respect to the lower traveling unit 1, so that the position of the center of gravity of the upper revolving unit 2 can be kept low, and the stability of the vehicle body can be improved.
It is possible to easily get on and off the driver's cab.

Further, since the mounting position of the working device 3 from the ground can be lowered, the maximum excavation depth using the working device 3 can be set larger, and the performance and reliability of the hydraulic shovel can be improved. Etc. can be increased.

Next, FIG. 7 shows a second embodiment of the present invention. In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be given. It shall be omitted.

However, the feature of this embodiment is that the swing post 16 is provided with an upper bracket 31 and a lower bracket 32 in place of the upper bracket 17 and the lower bracket 18 described in the first embodiment. An upper connecting pin 33 (hereinafter, referred to as a connecting pin 33) is fixed by press-fitting into a pin hole 31A formed in the upper bracket 31 and a pin hole 3 formed in the lower bracket 32.
The lower connecting pin 34 (hereinafter referred to as the connecting pin 34) is fixed in the 2A by press-fitting.

Here, the connecting pin 33 is formed as a flanged cylindrical body having an annular flange 33A on the upper end side, and the pin hole 3 is formed with the flange 33A in contact with the upper bracket 31.
Press fit into 1A. In addition, connecting pin 3
4 is also formed as a flanged cylindrical body having an annular flange portion 34A on the upper end side. The flange portion 34A is fitted into the pin hole 32A in a press-fit state with the flange portion 34A in contact with the lower bracket 32. I have.

Thus, also in the present embodiment configured as described above, the connecting pin 33 and the connecting pin 34 can be firmly fixed to the upper bracket 31 and the lower bracket 32, respectively, while being prevented from rotating and stopped. Almost the same effects as those of the first embodiment can be obtained.

Next, FIG. 8 shows a third embodiment of the present invention. In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be given. It shall be omitted.

The feature of this embodiment is that the swing post 16 is provided with an upper bracket 41 and a lower bracket 42 in place of the upper bracket 17 and the lower bracket 18 described in the first embodiment. Each of the upper bracket 41 and the lower bracket 42 has an upper connecting pin 43 (hereinafter, referred to as a connecting pin 43),
The configuration is such that the lower connection pin 44 (hereinafter, referred to as the connection pin 44) is fixed by welding.

The upper bracket 41 has a pin hole 4
1A is drilled, and the upper end side of the connecting pin 43 is fixed in the pin hole 41A by welding. A pin hole 42A is also formed in the lower bracket 42, and the upper end of the connecting pin 44 is fixed to the pin hole 42A by welding.

Thus, also in the present embodiment configured as described above, substantially the same operation and effect as in the first embodiment can be obtained.

Next, FIG. 9 shows a fourth embodiment of the present invention. In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be given. It shall be omitted.

The feature of this embodiment is that the swing post 16 is provided with an upper bracket 51 and a lower bracket 52 in place of the upper bracket 17 and the lower bracket 18 described in the first embodiment. An upper connecting pin 53 (hereinafter, referred to as a connecting pin 53) and a lower connecting pin 54 (hereinafter, referred to as a connecting pin 54) are fixed to the upper bracket 51 and the lower bracket 52, respectively, in a fastened state. It is in.

Here, the connecting pin 53 is formed as a flanged cylindrical body having an annular flange 53A on the upper end side. When the upper end of the connecting pin 53 is inserted into the pin hole 51A of the upper bracket 51, the flange 53A is connected to the upper bracket using a plurality of fastening bolts 55 (only two of which are shown) or the like. 51.

The connecting pin 54 is also formed as a flanged cylinder having an annular flange 54A on the upper end side. The connecting pin 54 has its upper end inserted into the pin hole 52A of the lower bracket 52, and the flange 54A is connected to a plurality of fastening bolts 56 (2
Are fixed to the lower bracket 52 by using such a member.

Thus, in the present embodiment configured as described above, substantially the same operation and effect as those of the first embodiment can be obtained.

Particularly, in the present embodiment, the connecting pins 53,
Since the connecting pins 54 are detachably attached to the upper bracket 51 and the lower bracket 52 using the fastening bolts 55 and 56, respectively, when the life of the connecting pins 53 and 54 occurs, the connecting bolts 55 and 56 are used. Only the connecting pins 53 and 54 can be easily replaced with new ones, and the entire swing post 16 need not be replaced.

Next, FIG. 10 shows a fifth embodiment of the present invention. The feature of this embodiment is that an upper bracket and a lower bracket are provided on a revolving frame, and each of these brackets has an upper connecting pin. , The lower connecting pin is fixedly provided, and the swing post is provided with an upper boss having an upper bush fitted therein, and a lower boss having a lower bush fitted therein. The configuration is such that the side connection pin is slidably inserted.

In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

In the drawing, reference numeral 61 denotes a bearing device used in the present embodiment. The bearing device 61 includes an upper bracket 62 described later,
The lower bracket 63, the upper boss 64, the lower boss 66, and the connecting pins 68 and 69 are substantially constituted.

Reference numeral 62 denotes the upper boss 1 according to the first embodiment.
2, an upper bracket provided on the front end side of the upper plate 4 </ b> D of the revolving frame 4, a connecting pin 68 is integrally formed on the upper bracket 62, and the upper boss 64 is rotatable via the connecting pin 68. Are linked.

Reference numeral 63 denotes a lower boss 1 according to the first embodiment.
4, a lower bracket provided at the front end of the bottom plate 4 </ b> A of the revolving frame 4, a connecting pin 69 is integrally formed on the lower bracket 63, and the lower boss 66 rotates via the connecting pin 69. It is connected as possible.

Reference numeral 64 denotes an upper boss provided on the swing post 16 instead of the upper bracket 17 according to the first embodiment. The upper boss 64 is disposed above the upper bracket 62. On the inner peripheral side of the upper boss 64, an upper bush 65 having a pin hole 65A formed of a copper alloy or the like is fitted and provided.

Reference numeral 66 denotes a lower boss provided on the swing post 16 instead of the lower bracket 18 according to the first embodiment. The lower boss 66 is provided between the upper bracket 62 and the lower bracket 63. Are located in A lower bush 67 having a pin hole 67A made of a copper alloy or the like is fitted on the inner peripheral side of the lower boss 66.

Reference numeral 68 denotes an upper connecting pin fixed to the upper bracket 62 (hereinafter referred to as a connecting pin).
The connecting pin 68 is formed integrally with the upper bracket 62, protrudes upward from the upper bracket 62, and is slidably inserted into the upper bush 65.

Reference numeral 69 denotes a lower connecting pin fixed to the lower bracket 63 (hereinafter referred to as a connecting pin).
The connecting pin 69 is formed integrally with the lower bracket 63, projects upward from the lower bracket 63, and is slidably inserted into the lower bush 67.

Reference numeral 70 denotes a stopper which is detachably fixed to the upper end of the connecting pin 68. The stopper 70 is attached to the connecting pin 68 by a bolt 71 or the like, and is brought into contact with the upper boss 64 so that the upper Connect boss 64 with connecting pin 6
8 is held in a retaining state.

Thus, in the present embodiment having the above-described structure, substantially the same operation and effect as those of the first embodiment can be obtained.

Next, FIG. 11 shows a sixth embodiment of the present invention. The feature of this embodiment is that the upper boss and the lower boss provided on the swing post use one connecting pin. The upper bracket and the lower bracket provided on the revolving frame are rotatably connected to each other, and a fixing means for fixing the connecting pin to the upper bracket is provided between the upper bracket and the lower boss. That is, they are arranged.

In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

In the figure, reference numeral 81 denotes a bearing device used in the present embodiment.
The lower bracket 83, the upper boss 84, the lower boss 86, the connecting pin 88, and the fixing bolt 89 are substantially constituted.

Reference numeral 82 denotes the upper boss 1 according to the first embodiment.
Instead of the upper bracket 2, a pin hole 82 </ b> A is formed in the upper bracket 82 provided on the front end side of the upper plate 4 </ b> D of the revolving frame 4. The upper bracket 82 is formed with a cylindrical portion 82B which constitutes a part of the pin hole 82A and protrudes downward.

Reference numeral 83 denotes the lower boss 1 according to the first embodiment.
4 is a lower bracket provided at the front end of the bottom plate 4A of the revolving frame 4, and the lower bracket 83 is provided with a pin hole 83A.

Reference numeral 84 denotes an upper boss provided on the swing post 16 in place of the upper bracket 17 according to the first embodiment, and the upper boss 84 is disposed above the upper bracket 82. On the inner peripheral side of the upper boss 84, an upper bush 85 having a pin hole 85A formed of a copper alloy or the like is fitted and provided.

Reference numeral 86 denotes a lower boss provided on the swing post 16 in place of the lower bracket 18 according to the first embodiment, and the lower boss 86 is provided between the upper bracket 82 and the lower bracket 83. Are located in On the inner peripheral side of the lower boss 86, a lower bush 87 having a pin hole 87A made of a copper alloy or the like is fitted and provided.

A connecting pin 88 rotatably connects the upper boss 84 and the lower boss 86 to the upper bracket 82 and the lower bracket 83, respectively. The connecting pin 88 is a pin between the upper bracket 82 and the lower bracket 83. Hole 82A, 8
3A, and is slidably inserted into pin holes 85A, 87A of the upper bush 85 and the lower bush 87.

An annular flange 88A as a positioning portion is integrally formed on the upper end side of the connecting pin 88.
8A comes into contact with the upper boss 84 so that the connecting pin 88
Are positioned in the upper bush 85 in the axial direction.

Reference numeral 89 denotes an upper bracket 82 and a lower boss 86
Between the upper bracket 82 and the connecting pin 88
And shows a fixing bolt serving as fixing means provided between
The fixing bolt 89 is attached to the cylindrical portion 82B of the upper bracket 82.
And a connecting pin 88 is provided penetrating in the radial direction, and is fixed to the cylindrical portion 82B using fixing nuts 90, 90 and the like. The fixing bolt 89 is configured to stop the connecting pin 88 from rotating with respect to the upper bracket 82 and to fix the connecting pin 88 in a state where the connecting pin 88 is prevented from being pulled out.

Thus, in the present embodiment configured as described above, the fixing bolt 89 can be disposed by utilizing the space between the upper bracket 82 and the lower boss 86, and the fixing bolt 89 is used for connection. Since the pin 88 can be fixed to the upper bracket 82, it is not necessary to fix the connecting pin 88 to the lower bracket 83.

Thus, the connecting pin 88 can suppress the projecting dimension of the lower bracket 83 from the pin hole 83A to almost zero, and secure a large space S between the lower traveling structure 1 and the upper revolving structure 2. It is possible to obtain substantially the same operation and effect as in the first embodiment.

Next, FIG. 12 shows a seventh embodiment of the present invention. The feature of this embodiment is that the upper boss and the lower boss provided on the swing post use one connecting pin. The upper and lower brackets provided on the revolving frame side are rotatably connected to each other, and a cylindrical collar member is fixedly provided on the upper bracket on the outer peripheral side of the connecting pin, and the connecting pin is connected to the upper bracket. The fixing means for fixing the fixing member is constituted by fixing bolts provided to penetrate the collar member and the connecting pin in the radial direction.

In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

In the figure, reference numeral 91 denotes a bearing device used in the present embodiment, and the bearing device 91 is also substantially the same as the bearing device 81 described in the sixth embodiment, and is similar to the bearing device 81 described in the sixth embodiment.
2. Lower bracket 93, upper boss 94, upper bush 95, lower boss 96, lower bush 97, connecting pin 9
8, is substantially constituted by a collar member 99 and a fixing bolt 100 described later.

The connecting pin 98 is inserted into the pin holes 92A and 93A of the upper bracket 92 and the lower bracket 93, and slides into the pin holes 95A and 97A of the upper bush 95 and the lower bush 97. It is movably inserted. An annular flange 98A as a positioning portion is integrally formed on the upper end side of the connecting pin 98, and the flange 98A
Is for positioning the connecting pin 98 in the upper bush 95 in the axial direction by contacting the upper boss 94.

Reference numeral 99 denotes a cylindrical collar member which is located on the outer peripheral side of the connecting pin 98 and is fixed to the upper bracket 92 with bolts or the like. , And the upper end side is fastened to the upper bracket 92.

Reference numeral 100 denotes a fixing bolt which constitutes fixing means together with the collar member 99. The fixing bolt 100 is provided through the connecting pin 98 and the collar member 99 in the radial direction. It is fixedly attached to 99.

Thus, in the present embodiment configured as described above, it is possible to obtain substantially the same operation and effect as in the seventh embodiment.

Particularly, in the present embodiment, the color member 99
By covering the outer peripheral side of the connecting pin 98 from the outside between the upper bracket 92 and the lower boss 96,
The connection pins 98 can be protected from impacts such as earth and sand, and the durability and the like of the connection pins 98 can be improved.

In the fifth embodiment, the connecting pins 6
8 and the connecting pin 69 are connected to the upper bracket 6 respectively.
2. Although the case where it is formed integrally with the lower bracket 63 has been described by way of example, the upper connecting pin 111 (hereinafter, connecting pin) may be replaced with, for example, as in a first modified example shown in FIG. 111) and a lower connecting pin 112 (hereinafter, referred to as a connecting pin 112) are formed separately from the upper bracket 113 and the lower bracket 114, respectively, and these connecting pins 111 and 112 are formed into pin holes 113A of the upper bracket 113. Inner, pin hole 11 of lower bracket 114
4A may be fixed by press-fitting,
As shown by a dashed line in FIG. 13, connecting pins 111, 112 are fastened using fastening bolts 115, 116 as fastening means.
May be fixed.

Further, in place of the fifth embodiment, FIG.
4, the upper connecting pin 121 and the lower connecting pin 122 are respectively connected to the upper bracket 1.
It may be configured to be fixed by welding in the pin holes 123A of the 23 and the pin holes 124A of the lower bracket 124.

Further, in the first embodiment, the case where the bearing device 11 is applied to the pin connecting portion between the revolving frame 4 and the swing post 16 has been described as an example, but the present invention is not limited to this. For example, a pin joint between the boom 3A of the working device 3 and the bracket 19 of the swing post 16, a pin joint between the boom cylinder 3D and the bracket 19 of the swing post 16, a pin joint between the tip of the arm 3B and the bucket 3C, and the like. It can be widely applied to other pin joints. This is the same in the second, third, fourth, fifth, sixth, and seventh embodiments.

On the other hand, in each embodiment, the case where the bearing device is applied to a hydraulic excavator has been described as an example. However, the present invention is not limited to this, and is applied to other construction machines such as a hydraulic crane. Is also good.

[0113]

As described in detail above, according to the first aspect of the present invention, of the upper boss and the lower boss provided on one member, the upper boss is provided on the other member above the upper boss. An upper bracket is disposed, an upper connecting pin protruding from the upper bracket is slidably inserted into the upper bush, and a lower bracket provided on the other member is provided between the upper boss and the lower boss. And the lower connection pin protruding from the lower bracket is slidably inserted into the lower bush, so when assembling the other member to one member using a bearing device. By simply moving the other member downward from above one member, the upper connecting pin and the lower connecting pin can be easily inserted and fitted into the upper bush and the lower bush.

When the upper connecting pin and the lower connecting pin are attached in this manner, the upper bracket and the lower bracket are held in alignment with the upper boss and the lower boss, respectively, as described in the prior art. This eliminates the need for installation and saves time-consuming positioning work, thereby improving workability during assembly.

According to the second aspect of the present invention, the upper boss is one of the upper boss and the lower boss provided on one of the members.
An upper connecting pin protruding from the upper bracket is slidably inserted into the upper bush while being disposed above the upper bracket provided on the other member, and a lower boss is provided on the other member. In this case, the lower bracket is disposed between the upper bracket and the lower bracket, and the lower connecting pin projecting from the lower bracket is slidably inserted into the lower bush. When assembling the other member to one member by using, the assembly can be easily performed simply by moving the other member downward from above the one member, and the invention according to claim 1 Workability at the time of assembly can be improved almost in the same manner.

Further, according to the third aspect of the present invention, since the upper connecting pin is formed integrally with the upper bracket and the lower connecting pin is formed integrally with the lower bracket, the upper connecting pin and the lower connecting pin are formed integrally. It can be firmly integrated with the upper bracket and the lower bracket, and rattling between the upper connecting pin and the upper bracket and between the lower connecting pin and the lower bracket occur as described in the related art. However, it is possible to prevent the occurrence of abrasion, settling, and the like due to such rattling, and to improve the durability, life, and the like of each of the connecting pins and each of the brackets.

According to the fourth aspect of the present invention, the upper connecting pin is fixed in the pin hole of the upper bracket by press fitting, and the lower connecting pin is fixed in the pin hole of the lower bracket by press fitting. The upper connecting pin and the lower connecting pin can be firmly fixed in the pin hole of the upper bracket and the pin hole of the lower bracket, respectively, and substantially the same effect as the invention of claim 3 can be obtained.

Further, even when the upper connecting pin is fixed to the upper bracket by welding and the lower connecting pin is fixed to the lower bracket by welding, the upper connecting pin, The lower connecting pin can be firmly fixed and attached to the upper bracket and the lower bracket, respectively, and substantially the same effect as the invention of claim 3 can be obtained.

Further, according to the invention of claim 6, the upper connecting pin is fixed to the upper bracket by using a fastener, and the lower connecting pin is fixed to the lower bracket by using another fastener. The upper connection pin and the lower connection pin can be detachably attached to the upper bracket and the lower bracket using fasteners, and the upper connection pin and the lower connection pin can be easily replaced with new ones. it can.

Further, according to the invention of claim 7, the stopper is provided at the projecting end of the upper connecting pin so as to hold the upper connecting pin in the upper bush in a retaining state. Even when a thrust load is applied, the stopper abuts on the upper boss, so that rattling between one member and the other member in the upward and downward directions can be prevented,
One member can be smoothly rotated with respect to the other member.

On the other hand, according to the invention of claim 8, the upper boss of the upper boss and the lower boss provided on one member is
The upper boss is disposed above the upper bracket provided on the other member, and the lower boss is disposed between the upper bracket and the lower bracket provided on the other member. The upper bracket and the lower bracket are rotatably connected to the upper bracket and the lower bracket using the connecting pins, and a fixing means for fixing the connecting pin to the upper bracket is provided between the upper bracket and the lower boss. Even in this case, when assembling the other member to one member using the bearing device, the other member is moved down from above the one member, and is simply assembled using only a single connecting pin. Mounting can be performed, and the workability at the time of mounting can be improved in substantially the same manner as in the first aspect of the present invention.

Further, the fixing means can be mounted between the upper bracket and the connecting pin by utilizing the space between the upper bracket and the lower boss. It is not necessary to attach the bearing device to the upper and lower swinging bodies mounted on, for example, a small hydraulic excavator. It can be suitably used for a pin connecting portion of a working device, a pin connecting portion of a working device, and the like.

According to the ninth aspect of the present invention, since the fixing means is constituted by the fixing bolt provided to penetrate the upper bracket and the connecting pin in the radial direction, the fixing bolt can be easily provided between the upper bracket and the connecting pin. Can be installed,
Workability at the time of mounting the fixing bolt can be improved.

According to a tenth aspect of the present invention, the fixing means includes a cylindrical collar member fixedly provided to the upper bracket at a position on the outer peripheral side of the connecting pin, and penetrating the collar member and the connecting pin in the radial direction. The connecting pin is covered with the collar member to protect the connecting pin from the outside, and the connecting pin can be protected from impacts such as earth and sand, and the durability of the connecting pin can be improved. Can be.

Further, in the invention according to claim 11, the upper end of the connecting pin is provided with a positioning portion for positioning the connecting pin in the axial direction in the upper bush by contacting the upper boss. Sometimes, the positioning pin allows the connecting pin to be axially positioned in the upper bush, and in this state, the connecting pin can be easily fixed to the upper bracket using the fixing means, thereby improving workability during assembly. it can.

Furthermore, according to the twelfth aspect of the present invention, one member is constituted by a frame of a construction machine, and the other member is constituted by a swing post which swings a working device of the construction machine left and right. The swing post of the construction machine, which is the other member, can be connected to the frame of the construction machine, which is the one member, so as to be rotatable left and right. The working device is integrally formed with the swing post at the front side of the frame. It can swing smoothly to the right.

[Brief description of the drawings]

FIG. 1 is a front view showing a hydraulic shovel to which a bearing device according to a first embodiment of the present invention is applied.

FIG. 2 is an enlarged plan view showing the turning frame in FIG. 1 with a swing post attached.

FIG. 3 is a partial cross-sectional view of the revolving frame, the swing post, the bearing device, and the like, which are enlarged from the direction of arrows III-III in FIG.

FIG. 4 is an enlarged longitudinal sectional view showing the bearing device in FIG. 3;

FIG. 5 is a perspective view showing the swing post in FIG. 3 alone;

FIG. 6 is a partial cross-sectional view similar to FIG. 3, showing a state where the swing post is detached from the turning frame.

FIG. 7 is an enlarged longitudinal sectional view showing a bearing device according to a second embodiment of the present invention.

FIG. 8 is an enlarged longitudinal sectional view showing a bearing device according to a third embodiment of the present invention.

FIG. 9 is an enlarged longitudinal sectional view showing a bearing device according to a fourth embodiment of the present invention.

FIG. 10 is an enlarged longitudinal sectional view showing a bearing device according to a fifth embodiment of the present invention.

FIG. 11 is an enlarged longitudinal sectional view showing a bearing device according to a sixth embodiment of the present invention.

FIG. 12 is an enlarged longitudinal sectional view showing a bearing device according to a seventh embodiment of the present invention.

FIG. 13 is an enlarged longitudinal sectional view showing a bearing device according to a first modified example of the present invention.

FIG. 14 is an enlarged longitudinal sectional view showing a bearing device according to a second modification of the present invention.

[Explanation of symbols]

3 Working device 4 Revolving frame 11, 61, 81, 91 Bearing device 12, 64, 84, 94 Upper boss 13, 65, 85, 95 Upper bush 13A, 15A 31A, 32A, 41A, 42A, 5
1A, 52A, 65A, 67A, 82A, 83A, 85
A, 87A, 92A, 93A, 95A, 97A, 113
A, 114A, 123A, 124A Pin holes 14, 66, 86, 96 Lower boss 15, 67, 87, 97 Lower bush 16 Swing post 17, 31, 41, 51, 62, 82, 92, 113,
123 upper bracket 18, 32, 42, 52, 63, 83, 93, 114,
124 Lower bracket 21, 33, 43, 53, 68, 111, 121 Upper connection pin 22, 34, 44, 54, 69, 112, 122 Lower connection pin 23, 70 Stopper 55, 56 Fastening bolt (fastener) 88, 98 Connecting pin 88A, 98A Flange (positioning part) 89, 100 Fixing bolt (fixing means) 99 Collar member (fixing means)

Claims (12)

[Claims] 1. An upper boss provided on one member and having an upper bush fitted on an inner peripheral side thereof, and a lower bush provided on the one member and located below the upper boss and provided on the inner peripheral side. A lower boss fitted with, an upper bracket positioned above the upper boss and provided on the other member, and positioned between the upper boss and the lower boss to the other member. A lower bracket provided, and an upper connecting pin that protrudes downward from the upper bracket and that is slidably inserted into the upper bush to connect the upper boss and the upper bracket so as to be relatively rotatable. A lower connecting pin provided to protrude downward from the lower bracket and slidably inserted into the lower bush to connect the lower boss and the lower bracket so as to be relatively rotatable. Bearing device is formed by. 2. An upper bracket provided on one of the members, a lower bracket provided on the one of the members below the upper bracket, and the other above the upper bracket. An upper boss provided on the member and having an upper bush fitted on the inner peripheral side; and a lower bush fitted on the inner peripheral side provided on the other member and located between the upper bracket and the lower bracket. A lower boss attached to the upper bracket, and an upper connecting pin that is provided to protrude upward from the upper bracket and that is slidably inserted into the upper bush to connect the upper bracket and the upper boss relatively rotatably. The lower bracket and the lower boss are rotatably connected by being slidably inserted into the lower bush and provided to protrude upward from the lower bracket. Bearing device comprising constituted by a lower connecting pins. 3. The bearing device according to claim 1, wherein the upper connection pin is formed integrally with the upper bracket, and the lower connection pin is formed integrally with the lower bracket. 4. A structure in which the upper connection pin is fixed by press-fitting into a pin hole formed in the upper bracket, and the lower connection pin is fixed by press-fitting into a pin hole formed in the lower bracket. Item 3. The bearing device according to item 1 or 2. 5. The bearing device according to claim 1, wherein the upper connection pin is fixed to the upper bracket by welding, and the lower connection pin is fixed to the lower bracket by welding. 6. The structure according to claim 1, wherein the upper connecting pin is fixed to the upper bracket using a fastener, and the lower connecting pin is fixed to the lower bracket using another fastener. Bearing device. 7. A protruding end of the upper connecting pin is provided with a stopper which abuts on the upper boss to hold the upper connecting pin in the upper bush in a retaining state. 7. The bearing device according to 4, 5, or 6. 8. An upper bracket provided on one member, a lower bracket provided on the one member located below the upper bracket, and another located above the upper bracket. An upper boss provided on the member and having an upper bush fitted on the inner peripheral side; and a lower bush fitted on the inner peripheral side provided on the other member and located between the upper bracket and the lower bracket. The lower boss attached, the pin hole of the upper bracket and the pin hole of the lower bracket, and the upper bracket and the lower bracket are slidably inserted into the upper bush and the lower bush. A connection pin that is connected to the boss and the lower boss so as to be relatively rotatable, and is provided between the upper bracket and the connection pin and located between the upper bracket and the lower boss. Bearing device comprising a connecting pin configured by a fixing means for fixing to the upper bracket. 9. The bearing device according to claim 8, wherein said fixing means is constituted by a fixing bolt provided through said upper bracket and said connecting pin in a radial direction. 10. The fixing means includes a cylindrical collar member which is located on the outer peripheral side of the connection pin and is fixed to the upper bracket and radially penetrates the collar member and the connection pin. 9. The bearing device according to claim 8, comprising a fixing bolt provided. 11. A positioning portion provided at an upper end of the connecting pin to abut on an upper boss to position the connecting pin in the upper bush in the axial direction.
Or the bearing device according to 10. 12. The construction machine according to claim 1, wherein the one member is a frame of a construction machine, and the other member is a swing post for swinging a working device of the construction machine left and right.
The bearing device according to 2, 3, 4, 5, 6, 7, 8, 9, 10, or 11.