JP7118927B2 - construction machinery - Google Patents

Description

TECHNICAL FIELD The present invention relates to a construction machine such as a hydraulic excavator having a working device mounted on the front portion of an upper revolving body so as to be able to swing leftward and rightward.

In general, a hydraulic excavator, which is a representative example of construction machinery, includes a self-propelled undercarriage, an upper revolving body supported on the upper side of the undercarriage so as to be able to turn, and a working structure provided at the front of the upper revolving body. device.

Here, the hydraulic excavator includes a small hydraulic excavator for working in a narrow work site or the like. A small hydraulic excavator, usually called a mini excavator, is used, for example, for demolition work inside buildings and excavation work in narrow streets. A small hydraulic excavator includes a swing post that is swingably attached to a support bracket of a swing frame and to which a working device is attached.

A pin is provided extending upward and downward between the swing post and the support bracket of the swing frame. Here, the swing post is passed through a plurality of hydraulic hoses through which pressurized oil for operating the working device is passed. Therefore, in the prior art, the pin that rotatably connects the swing post to the support bracket of the swing frame is divided into an upper pin and a lower pin, and a space for passing the hydraulic hose is secured between the pins. is known (Patent Document 1).

JP-A-11-43966

By the way, in Patent Document 1, the upper pin is inserted from the upper side of the swing post, and the lower pin is inserted from the lower side of the swing post. In this case, since the pin is made of metal and is heavy, it takes time and effort to insert it. In particular, when inserting the lower pin, the operator must lift the lower pin while searching for a hole for inserting the pin and aligning the hole. There is

SUMMARY OF THE INVENTION 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 facilitate the insertion and installation of the lower pins by inserting the lower pins from above, thereby improving assembly workability. To provide a construction machine capable of

The present invention comprises a self-propelled undercarriage, an upper revolving body rotatably supported on the upper side of the undercarriage, and a work device provided at the front of the upper revolving body. The revolving body includes a revolving frame provided with a support bracket protruding forward, and a swing post swingably attached to the support bracket and to which the work device is attached. is rotatably connected by an upper pin and a lower pin arranged on the same axis in the vertical direction, the lower pin is connected to the support for inserting the upper pin. The diameter of the lower pin is formed to be smaller than the diameter of the upper pin hole so as to be able to pass through the upper pin hole provided in the bracket and the swing post.

According to the present invention, the lower pin can be inserted from the upper side, and the mounting work of the lower pin can be facilitated to improve assembly workability.

BRIEF DESCRIPTION OF THE DRAWINGS It is a front view which shows the hydraulic excavator applied to the 1st Embodiment of this invention. FIG. 4 is an enlarged perspective view of a main part showing a state in which a swing post is attached to a support bracket of a revolving frame; FIG. 4 is a cross-sectional view showing the support bracket, swing post, upper pin and lower pin according to the first embodiment in an assembled state; FIG. 4 is a cross-sectional view of the swing post and the lower pin according to the second embodiment, viewed from the same position as in FIG. 3 together with the support bracket and the upper pin; FIG. 4 is a sectional view of a support bracket, a swing post, an upper pin and a lower pin according to a third embodiment viewed from the same position as in FIG. 3;

DESCRIPTION OF THE PREFERRED EMBODIMENTS A crawler hydraulic excavator will be described below in detail with reference to the accompanying drawings as a representative example of construction machinery according to embodiments of the present invention.

1 to 3 show a first embodiment of the invention. A hydraulic excavator 1 as a construction machine is configured as a canopy-specification compact hydraulic excavator (a model called a mini-excavator) having a canopy 18, which will be described later. This hydraulic excavator 1 includes a crawler-type lower traveling body 2 that can travel by itself, an upper revolving body 3 that is rotatably supported on the upper side of the lower traveling body 2, and an operation device that is provided in front of the upper revolving body 3. and a device 4 .

The work device 4 is used, for example, to excavate soil and demolish buildings. The work device 4 is attached via a swing post 7 to a support bracket 6 of a revolving frame 5 which will be described later. The work device 4 includes a boom 4A attached to the upper part of the swing post 7 so as to be able to move up and down, an arm 4B attached to the tip of the boom 4A so as to rotate, and a tip of the arm 4B to rotate. It is composed of a bucket 4C that can be attached, and a boom cylinder 4D, an arm cylinder 4E, and a bucket cylinder 4F that drive them. In addition, in the working device 4, it is possible to replace the bucket 4C with other working tools such as a grapple and a breaker (none of which are shown). The boom cylinder 4D has a base end attached to the front portion of the swing post 7, and a tip end portion attached to a middle portion of the boom 4A.

The revolving frame 5 constitutes a support structure for the upper revolving body 3 . As shown in FIG. 2, the revolving frame 5 has a bottom plate 5A extending in the front and rear directions, and a spaced left and right direction on the bottom plate 5A while extending in the front and rear directions and approaching each other toward the front side. A left vertical plate 5B and a right vertical plate 5C which are erected, an upper surface plate 5D located in front of the left vertical plate 5B and the right vertical plate 5C and extending so as to cover the vertical plates 5B and 5C, It is composed of a support bracket 6 which is provided and will be described later.

A support bracket 6 of the revolving frame 5 protrudes forward to support the swing post 7 . The support bracket 6 includes front portions of the bottom plate 5A, the left vertical plate 5B, the right vertical plate 5C, and the top plate 5D of the revolving frame 5. As shown in FIG. The support bracket 6 according to the present embodiment has a structure for supporting the swing post 7 using an upper pin 12 and a lower pin 13 which will be described later.

For this purpose, as shown in FIG. 3, an upper boss 6A projecting downward is provided at the front portion of the top plate 5D forming the support bracket 6, and an upper boss 6A projects upward from the front portion of the bottom plate 5A. A lower boss 6B is provided at each end. On top of this, the support bracket 6 has an upper pin hole 6C vertically penetrating the top plate 5D and the upper boss 6A, and a lower pin hole vertically penetrating the bottom plate 5A and the lower boss 6B. A pin hole 6D is provided. The upper pin hole 6C and the lower pin hole 6D are formed as circular holes having the same axis OO.

Here, the diameter d1 of the upper pin hole 6C (which is larger than the diameter D1 of the upper pin 12 by the fitting tolerance) is the diameter d2 of the lower pin hole 6D (which is larger than the diameter D2 of the lower pin 13 by the fitting tolerance). ) is formed larger than In this case, the diameter d1 of the upper pin hole 6C is set to a value that allows the lower pin 13 to be easily inserted (passed) without interference by lowering the lower pin 13 in a suspended state. there is

The swing post 7 is swingably attached to the support bracket 6 of the swing frame 5 . A boom 4A and a boom cylinder 4D of the work device 4 are attached to the swing post 7 . The swing post 7 is positioned between the left plate member 8 and the right plate member 9, which are spaced apart in the plate thickness direction (the direction in which the support bracket 6 is sandwiched), and the upper and lower intermediate portions of the plate members 8 and 9. An upper connecting member 10 connecting the left plate member 8 and the right plate member 9 together, and a lower connecting member 11 positioned below the upper connecting member 10 and connecting the left plate member 8 and the right plate member 9 together. is composed of

The left plate member 8 and the right plate member 9 are provided with boom mounting portions 8A and 9A positioned at the upper portion and cylinder mounting portions 8B and 9B (see FIG. 1) positioned at the front portion. A foot portion of a boom 4A of the work device 4 is rotatably attached to each of the boom attachment portions 8A and 9A. A tube of the boom cylinder 4D of the work device 4 is rotatably attached to each cylinder attachment portion 8B.

The upper connection member 10 has an upper plate 10A and a lower plate 10B that face each other with a gap in the upper and lower directions, and a semi-cylindrical connecting portion 10C that connects the upper plate 10A and the lower plate 10B. It is formed in a U shape. The upper connecting member 10 is provided with an upper pin hole 10D penetrating vertically through the upper plate 10A and the lower plate 10B. The upper pin 12 is inserted into the upper pin hole 10D. Therefore, the upper pin hole 10D is formed as a circular hole having a diameter equivalent to the diameter d1 of the upper pin hole 6C of the support bracket 6. As shown in FIG.

Between the upper plate 10A and the lower plate 10B of the upper connection member 10, there is a slight gap (a gap for allowing swing motion) between the front portion of the upper plate 5D of the revolving frame 5 and the upper boss 6A of the support bracket 6. can be placed with

Similar to the upper connection member 10, the lower connection member 11 includes an upper plate 11A and a lower plate 11B facing each other with a space therebetween, a front connecting portion 11C, an upper plate 10A and a lower plate 10B. It is formed by a lower pin hole 11D penetrating downward. A stopper 11E having a smaller diameter than the lower pin hole 11D is provided on the lower surface of the lower plate 11B. This stopper 11E restricts the lower pin 13 from coming off downward. Further, the lower plate 11B is provided with, for example, pin insertion holes 11F (illustrated by dotted lines) extending in the radial direction of the lower pin holes 11D. A detent pin 14 for restricting the rotation of the lower pin 13 is inserted into the pin insertion hole 11F.

The lower pin 13 is inserted into the lower pin hole 11D. Thereby, the lower pin hole 11D is formed as a circular hole having a diameter equivalent to the diameter d2 of the lower pin hole 6D of the support bracket 6. As shown in FIG. Between the upper plate 11A and the lower plate 11B of the lower connecting member 11, the front portion of the bottom plate 5A of the revolving frame 5 and the lower boss 6B of the support bracket 6 can be arranged with a slight gap.

Next, the structures of the upper pin 12 and the lower pin 13, which are characteristic parts of this embodiment, will be described.

The upper pin 12 is positioned between the support bracket 6 of the swing frame 5 and the swing post 7, that is, between the upper boss 6A of the support bracket 6 (including the top plate 5D of the swing frame 5) and the upper connection member 10 of the swing post 7. It is provided so as to extend upward and downward between the . The upper pin 12 is inserted into the upper pin hole 6C of the support bracket 6 and the upper pin hole 10D of the upper connecting member 10. As shown in FIG. The upper pin 12 includes a pin main body 12A inserted through the upper pin holes 6C and 10D, and a square flange portion 12B provided on the outer peripheral side of the upper portion of the pin main body 12A. The pin body 12A is formed as a cylindrical body with a diameter D1. The pin body 12A has a diameter D1 smaller than the diameter d1 of the upper pin holes 6C and 10D by a fitting tolerance (it can rotate without rattling).

The pin body 12A is provided with a screw hole 12D located in the center (axis OO) of the upper surface 12C. A lifting tool (not shown) such as an eyebolt for lifting and moving the upper pin 12 is attached to the screw hole 12D. Further, the lower surface 12E of the pin body 12A faces the upper surface 13A of the lower pin 13. As shown in FIG.

Here, as shown in FIG. 2, the square flange portion 12B is formed such that two opposing sides are fitted between the left plate member 8 and the right plate member 9 of the swing post 7. As shown in FIG. As a result, when the upper pin 12 is inserted into the upper pin holes 6C and 10D, the square flange portion 12B can prevent the upper pin 12 from rotating with respect to the swing post 7. As shown in FIG. Further, the upper pin 12 is pressed from the upper side by using a fixing jig (not shown) while being inserted into the upper pin holes 6C and 10D.

The lower pin 13 is located between the support bracket 6 of the swing frame 5 and the swing post 7 , that is, the lower boss 6B (including the bottom plate 5A of the swing frame 5 ) of the support bracket 6 and the lower connection member 11 of the swing post 7 . It is provided extending upward and downward between the The lower pin 13 is inserted into the lower pin hole 6D of the support bracket 6 and the lower pin hole 11D of the lower connecting member 11. As shown in FIG. The lower pin 13 is formed as a cylinder with a diameter D2.

The diameter D2 of the lower pin 13 is formed to be smaller than the diameter d2 of the lower pin holes 6D and 11D by a fitting tolerance (it can rotate without rattling). In addition, the diameter D2 of the lower pin 13 is smaller than the diameter d1 of the upper pin holes 6C and 10D provided in the support bracket 6 and the swing post 7 for inserting the upper pin 12. . This allows the lower pin 13 to pass through the upper pin holes 6C and 10D.

The lower pin 13 is provided with a screw hole 13B positioned in the center (axis OO) of the upper surface 13A. A lifting tool such as an eyebolt for lifting and moving the lower pin 13 is attached to the screw hole 13B. Further, the lower pin 13 is prevented from coming off downward by bringing the outer peripheral side of the lower surface 13C into contact with the stopper 11E of the lower connecting member 11 .

Further, a pin hole 13D is provided in the lower side of the lower pin 13 at a position corresponding to the pin insertion hole 11F of the lower connecting member 11. As shown in FIG. Therefore, by inserting the anti-rotation pin 14 into the pin insertion hole 11F and the pin hole 13D, the lower pin 13 is fixed to the swing post 7 by the anti-rotation pin 14 in a non-rotating state and a non-disengaging state. be.

The upper revolving body 3 is provided with a driver's seat 15 on which an operator sits. On both left and right sides of the driver's seat 15, operation levers 16 (only the left side is shown) for operating the working device 4 and the like are provided. An operation lever 17 for running is provided on the front side of the driver's seat 15 . Further, the upper revolving body 3 is provided with a canopy 18 that covers the upper side of the driver's seat 15 .

The hydraulic excavator 1 according to the present embodiment has the configuration described above, and the operation thereof will now be described.

The operator gets on the upper revolving structure 3 and sits on the driver's seat 15 . By operating the operation lever 17 for traveling in this state, the lower traveling body 2 can be caused to travel. On the other hand, by operating the operation lever 16 for work, the operator can perform the turning motion of the upper swing body 3, the work of excavating earth and sand by the work device 4, and the like.

Next, an example of assembly work for attaching the swing post 7 to the support bracket 6 of the swing frame 5 will be described.

First, the swing post 7 is arranged at the height position of the support bracket 6 of the revolving frame 5 using an elevator (crane, lifter, etc.). In this state, the upper plate 5D of the swing frame 5 and the upper pin hole 6C of the support bracket 6 are arranged between the upper plate 10A and the lower plate 10B of the upper connection member 10 of the swing post 7, and the upper side of the support bracket 6 is placed. The pin hole 6C and the upper pin hole 10D of the upper connecting member 10 are aligned. Similarly, the bottom plate 5A of the swing frame 5 and the bottom pin holes 6D of the support bracket 6 are arranged between the top plate 11A and the bottom plate 11B of the lower connection member 11 of the swing post 7, and the bottom side of the support bracket 6 is arranged. The pin hole 6D and the lower pin hole 11D of the lower connecting member 11 are aligned.

After the swing post 7 is positioned with respect to the support bracket 6 of the swing frame 5 in this manner, eyebolts are screwed into the screw holes 13B of the lower pins 13, the lower pins 13 are lifted by a crane, and the upper pin holes 6C, Move up 10D. By lowering the lower pin 13 in this state, the lower pin 13 can pass downward through the upper pin holes 6C and 10D. The lower pin 13 passing through the upper pin holes 6C and 10D can be inserted into the lower pin hole 6D of the support bracket 6 and the lower pin hole 11D of the lower connecting member 11. As shown in FIG.

Further, when the lower pin 13 is inserted into the lower pin holes 6D and 11D, the stopper 11E comes into contact with the lower surface 13C of the lower pin 13, thereby positioning the lower pin 13 in the axial direction and moving it downward. It is possible to prevent it from coming off. Furthermore, when the lower pin 13 is inserted into the lower pin holes 6D and 11D, the anti-rotation pin 14 is inserted into the pin insertion hole 11F of the lower connecting member 11 and the pin hole 13D of the lower pin 13. As shown in FIG. As a result, the anti-rotation pin 14 can prevent the lower pin 13 from rotating and coming off.

After inserting the lower pin 13 into the lower pin holes 6D and 11D, an eyebolt is screwed into the screw hole 12D of the upper pin 12, the upper pin 12 is lifted by a crane, and moved above the upper pin holes 6C and 10D. . By lowering the upper pin 12 in this state, the upper pin 12 can be inserted into the upper pin holes 6C and 10D. At this time, the two opposite sides of the square flange portion 12B of the upper pin 12 are arranged so as to fit between the left plate member 8 and the right plate member 9 of the swing post 7 . Thereby, the upper pin 12 can be prevented from rotating with respect to the swing post 7 . Also, the upper pin 12 can be retained by pressing it from above using a fixing jig.

Thus, according to this embodiment, the support bracket 6 and the swing post 7 of the swing frame 5 are rotated by the upper pin 12 and the lower pin 13 arranged on the same axis OO in the upward and downward directions. movably connected. In addition, the diameter D2 of the lower pin 13 is smaller than the diameter d1 of the upper pin holes 6C and 10D provided in the support bracket 6 and the swing post 7 for inserting the upper pin 12. .

Therefore, the lower pin 13 can be inserted from above into the lower pin holes 6D and 11D through the upper pin holes 6C and 10D. As a result, the lower pin 13 can be easily inserted into the lower pin holes 6D and 11D compared to the case of inserting the lower pin from the lower side of the swing post as in Patent Document 1. . As a result, it is possible to facilitate the work of inserting the lower pin 13 and improve the assembling workability.

The upper pin 12 is provided with a threaded hole 12D for attaching a lifting tool such as an eyebolt. Further, the lower pin 13 is provided with a threaded hole 13B for attaching a hanging tool. As a result, the upper pin 12 and the lower pin 13 can be easily moved up and down using a crane or the like.

Next, FIG. 4 shows a second embodiment of the invention. A feature of this embodiment is that the lower pin has a collar portion with a larger diameter than the diameter of the lower pin hole provided in the support bracket and the swing post for inserting the lower pin. That's what it is. In addition, in this embodiment, the same reference numerals are given to the same constituent elements as in the first embodiment described above, and the description thereof will be omitted.

In FIG. 4, the lower connecting member 22 of the swing post 21 according to the second embodiment includes an upper plate 22A, a lower plate 22B, a connecting portion 22C, a lower It has a pin hole 22D and a pin insertion hole 22E. However, the lower connecting member 22 according to the second embodiment differs from the lower connecting member 11 according to the first embodiment in that the stopper is omitted.

The lower pin 23 according to the second embodiment has an upper surface 23A, a screw hole 23B, a lower surface 23C and a pin hole 23D, like the lower pin 13 according to the first embodiment. However, the lower pin 23 according to the second embodiment differs from the lower pin 13 according to the first embodiment in that a circular flange 23E is provided at the upper end position.

The diameter D3 of the collar portion 23E is set to be larger (larger dimension) than the diameter d2 of the lower pin holes 6D and 22D and smaller (smaller dimension) than the diameter d1 of the upper pin holes 6C and 10D. . This allows the lower pin 23 to pass through the upper pin holes 6C and 10D. On top of this, the collar portion 23E abuts on the upper plate 22A of the lower connecting member 22, so that when the lower pin 23 is inserted into the lower pin holes 6D and 22D, the lower pin 23 is pushed downward. Prevents you from getting out.

Thus, the second embodiment configured in this way can also obtain the same effect as the first embodiment described above. In particular, according to the second embodiment, the lower pin 23 has the diameter A collar portion 23E having a diameter larger than d2 is provided. As a result, when the lower pin 23 is inserted into the lower pin holes 6D and 22D, the flange portion 23E is brought into contact with the upper plate 22A of the lower connecting member 22 so that the lower pin 23 can move downward. can be prevented from slipping out. Accordingly, the structure of the swing post 21 (lower connecting member 22) can be simplified.

Next, FIG. 5 shows a third embodiment of the invention. A feature of this embodiment is that the lower pin has a collar portion with a larger diameter than the diameter of the lower pin hole provided in the support bracket and the swing post for inserting the lower pin. In addition, the length of the insertion portion of the lower pin is formed to be longer than the length between the lower surface of the upper pin and the upper surface of the lower pin. In addition, in this embodiment, the same reference numerals are given to the same constituent elements as in the first embodiment described above, and the description thereof will be omitted.

5, a support bracket 31 according to the third embodiment has an upper boss 31A, a lower boss 31B, an upper pin hole 31C and a lower pin hole 31D, like the support bracket 6 according to the first embodiment. have. However, in the support bracket 31 according to the third embodiment, the height of the lower boss 31B is greater than the height of the lower boss 6B according to the first embodiment. is different from the lower boss 6B in the form of .

As with the lower connection member 11 of the first embodiment, the lower connection member 33 of the swing post 32 according to the third embodiment includes an upper plate 33A, a lower plate 33B, a connecting portion 33C, a lower pin hole 33D and a lower pin hole 33D. It has a pin insertion hole 33E. However, in the lower connecting member 33 according to the third embodiment, the stopper is omitted and the distance between the upper plate 33A and the lower plate 33B is the same as the upper plate 11A of the lower connecting member 11 according to the first embodiment. and the point that the lower connecting member 11 is formed larger than the interval with the lower plate 11B. That is, the distance between the upper plate 33A and the lower plate 33B of the lower connecting member 33 according to the third embodiment becomes a large value in accordance with the increase in height of the lower boss 31B of the support bracket 31. FIG.

The upper pin 34 according to the third embodiment has a pin body 34A, a square collar portion 34B, an upper surface 34C, a screw hole 34D and a lower surface 34E, like the upper pin 12 according to the first embodiment. However, in the upper pin 34 according to the third embodiment, the length of the pin body 34A is greater than the length of the pin body 12A of the upper pin 12 according to the first embodiment. is different from the upper pin 12 according to the embodiment of FIG.

The lower pin 35 according to the third embodiment has an upper surface 35A, a threaded hole 35B, a lower surface 35C and a pin hole 35D, like the lower pin 13 according to the first embodiment. However, the lower pin 35 according to the third embodiment has a circular flange 35E at the upper end position, and the length in the axial direction is the same as that of the lower pin 13 according to the first embodiment. It is different from the lower pin 13 according to the first embodiment in two respects, namely that the value is larger than the length.

The diameter D3 of the collar portion 35E is set to be larger (larger dimension) than the diameter d2 of the lower pin holes 31D and 33D and smaller (smaller dimension) than the diameter d1 of the upper pin holes 31C and 10D. . This allows the lower pin 35 to pass through the upper pin holes 31C and 10D. In addition, the flange portion 35E abuts against the upper plate 33A of the lower connection member 33, thereby preventing the lower pin 35 from coming out downward.

Further, the lower pin 35 according to the third embodiment has an insertion portion 35F which is inserted into the lower pin holes 31D and 33D, that is, a portion below the collar portion 35E. The lower pin 35 is formed such that the length L1 of the insertion portion 35F is longer than the length L2 between the lower surface 34E of the upper pin 34 and the upper surface 35A of the lower pin 35. As shown in FIG. As a result, when the lower pin 35 moves upward with respect to the lower pin holes 31D and 33D, the upper surface 35A contacts the lower surface 34E of the upper pin 34 before falling out of the lower pin holes 31D and 33D. .

Thus, the third embodiment configured in this way can also obtain the same effect as the first embodiment described above. In particular, according to the third embodiment, the lower pin 35 has diameters of lower pin holes 31D and 33D provided in the support bracket 31 and the swing post 32 for inserting the lower pin 35. A collar portion 35E having a diameter larger than d2 is provided. As a result, the lower pin 35 can be prevented from slipping out downward by bringing the flange 35E into contact with the upper plate 33A of the lower connecting member 33 . Accordingly, the configuration of the swing post 32 (lower connection member 33) can be simplified.

Moreover, according to the third embodiment, the length L1 of the insertion portion 35F of the lower pin 35 is longer than the length L2 between the lower surface 34E of the upper pin 34 and the upper surface 35A of the lower pin 35. formed large. As a result, for example, even if the anti-rotation pin 14 falls out of the pin insertion hole 33E of the lower connecting member 33 and the pin hole 35D of the lower pin 35, the lower pin 35 is prevented from falling out. can be done.

In the second embodiment, the bottom pin 23 is illustrated as if the flange 23E is integrally formed therewith. However, the present invention is not limited to this. For example, a separately provided flange may be attached to the lower pin by means of welding, screwing, or the like. This configuration can be similarly applied to the third embodiment.

Further, in each embodiment, the canopy specification hydraulic excavator 1 including the canopy 18 that covers the driver's seat 15 has been described as an example. However, the present invention is not limited to this, and may be applied to a cab-specification hydraulic excavator provided with a cab box that covers the area around and above the driver's seat.

Furthermore, in each embodiment, the small hydraulic excavator 1 provided with the crawler-type undercarriage 2 has been described as an example. However, the present invention is not limited to this, and may be applied to wheel-type hydraulic excavators, for example. Also, the present invention may be applied to a medium-sized hydraulic excavator in which a work device is provided so as to be able to swing.

Reference Signs List 1 hydraulic excavator 2 lower running body 3 upper revolving body 4 work device 5 revolving frame 6, 31 support bracket 6C, 10D, 31C upper pin hole 6D, 11D, 22D, 31D, 33D lower pin hole 7, 21, 32 swing post 12, 34 Upper pin 12C, 13A, 23A, 34C, 35A Upper surface 12D, 13B, 23B, 34D, 35B Screw hole 13, 23, 35 Lower pin 23E, 35E Flange 34E Lower surface 35F Insertion part OO Axis d1 Diameter of upper pin hole d2 Diameter of lower pin hole D2 Diameter of lower pin L1 Length of insertion part of lower pin L2 Length between lower surface of upper pin and upper surface of lower pin

Claims (4)

It comprises a self-propellable undercarriage, an upper revolving body rotatably supported on the upper side of the undercarriage, and a work device provided in front of the upper revolving body,
The upper revolving body is
a revolving frame provided with a support bracket protruding forward;
a swing post swingably attached to the support bracket and to which the working device is attached;
A construction machine in which the support bracket and the swing post are rotatably connected by an upper pin and a lower pin arranged on the same axis in the vertical direction,
The lower pin has a diameter larger than that of the upper pin hole so that the lower pin can pass through an upper pin hole provided in the support bracket and the swing post for inserting the upper pin. A construction machine characterized by being formed small. In the construction machine according to claim 1,
The lower pin is provided with a collar portion having a larger diameter than the diameter of the lower pin hole provided in the support bracket and the swing post for inserting the lower pin. construction machinery. In the construction machine according to claim 1,
The construction machine according to claim 1, wherein the lower pin has an insertion portion longer than a length between the lower surface of the upper pin and the upper surface of the lower pin. In the construction machine according to claim 1,
A construction machine according to claim 1, wherein the upper pin and the lower pin are each provided with a screw hole in an upper surface thereof.

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