JP2021050501A - Attachment for construction machine - Google Patents

Abstract

To provide an attachment for a construction machine allowing a gap adjustment shim to be easily attached.SOLUTION: An attachment 5 for a construction machine 1 comprises: a connection shaft 20; an upper frame 8 and a boom 10 connected by the connection shaft; and a gap adjustment shim 30 adjusting a gap in an axial direction between the upper frame and the boom, wherein the gap adjustment shim 30 is provided with a first component 31 and a second component 32 connected to each other within the gap. Each of the first component and the second component comprises: engagement sections 31a, 32a engageable to each other at one end part; and fastening concave sections 31b, 32b opposing to each other to form a fastening hole 33 at the other end part, which is attached on a circumference of the connection shaft between the engagement section and the fastening concave section.SELECTED DRAWING: Figure 4

Description

The present invention relates to attachments for construction machinery.

Conventionally, in an attachment of a construction machine such as a hydraulic excavator, for example, two members such as a frame and a boom, a boom and an arm, and an arm and a bucket are connected by a connecting shaft. Since a gap is generated in the axial direction between the two members due to the variation in the can manufacturing process, it is common to attach a gap adjusting shim to prevent rattling in this gap.

The extent of the gap between the two members will be determined after the connecting shaft is inserted into the two members when assembling the attachment. When the gap adjustment shim was required, it was necessary to pull out the connecting shaft once, attach the gap adjusting shim, and then tap the connecting shaft again, which required a great deal of labor.

In order to deal with such a problem, a gap adjusting device is known in which a gap adjusting shim is retrofitted without pulling out the connecting shaft. For example, Patent Document 1 discloses a gap adjusting device that uses a U-shaped shim and an auxiliary shim that can be inserted into the U-shaped shim and is assembled using three bolts. Further, Patent Document 2 discloses a gap adjusting device for assembling a half-split gap adjusting shim using two rivets.

Patent No. 5926203 Jikkai Sho 63-198646

The gap adjusting device of Patent Document 1 fixes a U-shaped shim and an auxiliary shim with three bolts. Therefore, screw holes are also provided at three places, which is an obstacle when inserting the shim into the gap. In addition, the work of attaching a plurality of bolts is complicated. Furthermore, it is difficult to apply it to existing construction machinery.

The gap adjusting device of Patent Document 2 is costly because the gap adjusting shim requires stepped press working. In addition, since it is assembled with two rivets in a narrow gap, the difficulty of the work is high. Further, since the half-split-shaped gap adjusting shims are connected so as to overlap each other when viewed from the axial direction, it is difficult to stack a plurality of sheets for fine adjustment.

The present invention has been made in view of this point, and an object of the present invention is to provide an attachment for a construction machine to which a gap adjusting shim can be easily attached.

In the present invention, a gap adjusting shim for adjusting the axial gap generated between the two members can be easily attached.

That is, the first invention is
An attachment of a construction machine having a connecting shaft, two members connected by the connecting shaft, and a gap adjusting shim for adjusting an axial gap generated between the two members.
The gap adjusting shim includes a first component and a second component that are connected to each other in the gap.
The first component and the second component each have a meshing portion that can be meshed with each other at one end and a fastening recess that forms a fastening hole facing each other at the other end. It is characterized in that it is attached to the outer periphery of the connecting shaft between the fastening recesses.

According to the above configuration, since the gap adjusting shim is composed of two parts, the first component and the second component, the clearance adjusting shim can be inserted into the gap later without pulling out the connecting shaft. Further, in the first part and the second part, one end is a meshing portion and the other end is a fastening hole, so that if the meshing portions are engaged with each other, the two fastening recesses are combined to form a fastening hole. Then, by inserting the fastening member into the fastening hole, it can be easily attached to the outer circumference of the connecting shaft. With such a configuration, since only one fastening portion (fastening hole) for connecting the first component and the second component to each other is required, the work can be made more efficient.

The second invention is the first invention.
At least a part of the meshing portion is formed within a range in which the sliding portions of the two members overlap when viewed from the axial direction.

According to the above configuration, since at least a part of the meshing portion is sandwiched between the two members to be connected, it is possible to prevent the meshing portion from being disengaged after the gap adjusting shim is attached.

The third invention is the first or second invention.
The first component and the second component are plate-shaped and are characterized in that they are connected so as not to overlap each other when viewed from the axial direction.

According to the above configuration, the first component and the second component are connected so as not to overlap when viewed from the axial direction to form one plate-shaped gap adjustment shim, so that a plurality of gap adjustment shims are stacked. The thickness dimension can be finely adjusted.

The fourth invention is defined in any one of the first to third inventions.
The meshing portion is arranged on a mating line passing through the center of the connecting shaft and the center of the fastening hole.
The fastening hole is characterized by including a pair of fastening recesses facing each other along a dividing line substantially orthogonal to the mating line.

According to the above configuration, by inserting the fastening member into the fastening hole, the first component and the second component do not shift in the circumferential direction, so that the fastening operation becomes easy.

In addition, "substantially orthogonal" is not limited to the case where the mating line and the dividing line intersect each other perpendicularly, and even if they are not strictly vertical, when the fastening member is inserted into the fastening hole, the first component and the first component and the first If the two parts intersect at an angle that does not shift in the circumferential direction, they are included in "substantially orthogonal".

The fifth invention is, in any one of the first to fourth inventions,
The meshing portion of the first component and the second component is characterized by having an insertion gap at the outer peripheral side end portion that allows the first component and the second component to swing in a state of being meshed with each other. To do.

According to the above configuration, the first component and the second component can be swung in the circumferential direction by the angle of the insertion gap even when the meshing portions are meshed. Since the fastening holes can be easily formed by combining the two fastening recesses, the mounting work becomes easier.

According to the present invention, a gap adjusting shim can be easily attached to an attachment of a construction machine.

It is a side view which shows the structure of a construction machine. It is an enlarged side view which shows the connection part of the frame and boom to which the gap adjustment shim which concerns on embodiment of this invention is applied. FIG. 2 is a cross-sectional view taken along the line III-III of FIG. It is a top view of the gap adjustment shim which concerns on embodiment of this invention. It is a side view which shows the attachment process of a gap adjustment shim enlarged. It is a side view which shows the attachment process of a gap adjustment shim enlarged. It is a side view which shows the attachment process of a gap adjustment shim enlarged.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the following description of the preferred embodiment is essentially merely an example and is not intended to limit the present invention, its application or its use. In each figure, the up-down, front-back, left-right directions are indicated by arrows. Unless otherwise specified, the directions such as up and down will be described according to the directions indicated by these arrows. In the following description, the "outer peripheral side" is a direction away from the axial center of the connecting shaft, and the "inner peripheral side" is a direction approaching the axial center of the connecting shaft. Further, the direction parallel to the extending direction of the connecting shaft is referred to as "axial direction", and the circumferential direction centered on the connecting shaft is referred to as "circumferential direction".

As shown in FIG. 1, the construction machine 1 is, for example, a hydraulic excavator, and includes a crawler-type lower traveling body 2 and an upper rotating body 4 rotatably connected to the lower traveling body 2 via a swivel bearing 3. .. The upper swivel body 4 is provided with an attachment 5, a cab 6, a machine room 7, and the like.

The upper swing body 4 has an upper frame 8 connected to the swing bearing 3. The upper frame 8 has a pair of vertical plates 9 and 9 that are erected at intervals on the left and right.

The attachment 5 is rotatably connected to the upper frame 8 via the vertical plates 9 and 9 at the front portion of the upper swivel body 4. The operation of the attachment 5 is performed in the cab 6.

The attachment 5 rotatably supports the boom 10 supported by the upper swing body 4, the boom cylinder 11 that rotatably supports the boom 10, the arm 12 connected to the tip of the boom 10, and the arm 12. The arm cylinder 13 is provided, and the bucket 14 is rotatably connected to the tip of the arm 12.

One end of the bucket link 15 is connected to the base end side of the bucket 14. A pair of idler links 16 are rotatably connected to the other end of the bucket link 15 and to the left and right sides of the tip of the arm 12, respectively. Then, the other end of the bucket link 15 and one end of the idler link 16 are connected to the tip of the bucket cylinder 17.

The attachment 5 has a connecting shaft 20, two members connected by the connecting shaft 20, and a gap adjusting shim 30 for adjusting an axial gap generated between the two members. Two members such as the upper frame 8 and the boom 10, the boom 10 and the boom cylinder 11, the boom 10 and the arm 12, the arm 12 and the arm cylinder 13, the arm 12 and the bucket 14 are connected by the corresponding connecting shafts 20, respectively. In order to adjust the axial gap generated between the two members, a gap adjusting shim 30 is inserted between the two members.

The gap adjusting shim 30 can be inserted between any of the members constituting the attachment 5, but can be used, for example, at the connecting portion between the upper frame 8 and the boom 10 as shown in FIG. Note that FIG. 2 shows a state in which a part of the vertical plate 9 is cut out and the gap adjusting shim 30 is exposed for convenience of explanation.

As shown in FIGS. 2 and 3, the base of the boom 10 is arranged between the left and right vertical plates 9 and 9 erected from the upper frame 8, and the boom foot pin (connecting shaft) 20 is inserted in the left-right direction. As a result, the boom 10 is undulated (rotatably) connected to the upper frame 8. A boss portion 9b for reinforcing the shaft insertion hole 9a is provided on the opposite surfaces of the left and right vertical plates 9 and 9, respectively.

Resin shims 50 and 50 are arranged between the base of the boom 10 and the left and right vertical plates 9 and 9, respectively. The resin shim 50 is a flat ring-shaped resin member having a size larger than the range in which the base portion of the boom 10 and the sliding portion of the boss portion 9b overlap when viewed from the axial direction, and the base portion of the boom 10 and the boss portion 9b. Prevents the sliding parts from wearing and reduces rattling noise.

A gap adjusting shim 30 is arranged between the resin shim 50 and the boom 10 base on either the left or right side between the boom 10 base and the left and right vertical plates 9 and 9. The gap adjusting shim 30 finally fills the axial gap generated between the two members, and is inserted into either the left or right side. The gap adjusting shim 30 is fixed to the boom 10 base by the fastening member 40.

A plurality of gap adjusting shims 30 having different thickness dimensions can be prepared and selected according to the gap dimensions at the assembly site. Further, a plurality of gap adjusting shims 30 may be inserted so as to be overlapped in the axial direction according to the gap size.

As shown in FIG. 4, the gap adjusting shim 30 includes a first component 31 and a second component 32 that are connected to each other in a gap between the two members. The first component 31 and the second component 32 have a plate shape and are connected so as not to overlap each other when viewed from the axial direction. Since the first component 31 and the second component 32 form one plate-shaped gap adjusting shim 30, a plurality of gap adjusting shims 30 can be stacked to finely adjust the thickness dimension.

The first component 31 and the second component 32 each have meshing portions 31a and 32a that can be meshed with each other at one end and fastening recesses 31b and 32b that form fastening holes 33 facing each other at the other end. , It is attached to the outer circumference of the connecting shaft 20 between the meshing portions 31a and 32a and the fastening recesses 31b and 32b. The center of the connecting shaft 20 is X, the center of the fastening hole 33 is Y, and the line passing through X and Y is the combined line L1.

At least a part of the meshing portions 31a and 32a is formed within a range in which the sliding portions of the two members overlap when viewed from the axial direction. In the present embodiment, the range in which the sliding portions of the two members overlap is within the range of the circle Z shown by the virtual line in FIG. For example, the boom 10 base portion and the boss portion 9b overlap and slide with each other within the range of the circle Z when viewed from the axial direction. With this configuration, at least a part of the meshing portions 31a and 32a is sandwiched between the two members to be connected, so that it is possible to prevent the meshing portions 31a and 32a from being disengaged after the gap adjusting shim 30 is attached. The meshing portion 31a has a meshing recess 310 on the outer peripheral side and a meshing convex portion 311 on the inner peripheral side. Further, the meshing portion 32a of the second component 32 has a meshing convex portion 320 on the outer peripheral side and a meshing recess 321 on the inner peripheral side. The meshing concave portion 310 of the first component 31 meshes with the meshing convex portion 320 of the second component 32, and the meshing convex portion 311 of the first component 31 meshes with the meshing concave portion 321 of the second component 32.

Since the meshing recesses 310, 321 and the meshing protrusions 320, 311 are arranged on the mating line L1 and are provided at an angle with respect to the mating line L1, they are provided in the circumferential direction in a state of being meshed with each other. Do not separate from. Here, the angle at which the meshing recesses 310, 321 and the meshing protrusions 320, 311 are inclined with respect to the mating line L1 is not limited, but does not include the case where they are perpendicular to the mating line L1.

The meshing portions 31a and 32a have an insertion gap 34 at the outer peripheral side end portion that allows the first component 31 and the second component 32 to swing in a state of being meshed with each other. The meshing recess 310 of the first component 31 is formed so as to be gradually larger toward the outer peripheral side end portion than the dimension of the meshing convex portion 320 of the second component 32. Therefore, in a state where the meshing portions 31a and 32a are meshed with each other, the outer peripheral side end portion is between the meshing recess 310 of the first component 31 and the meshing convex portion 320 of the second component 32 at the outer peripheral side end portion. There is an insertion gap 34 that gradually widens toward.

The fastening recesses 31b and 32b are formed along the dividing line L2 substantially orthogonal to the mating line L1 and face each other. The dividing line L2 is a line that substantially divides the fastening hole 33 into two. When a fastening member 40 such as a bolt is inserted into the fastening hole 33, the fastening recesses 31b and 32b are positioned by the fastening member, and the first component 31 and the second component 32 do not shift in the circumferential direction, so that the fastening operation is easy. It becomes. The dividing line L2 does not have to intersect the mating line L1 exactly perpendicularly, and when the fastening member 40 is inserted into the fastening hole 33, the first component 31 and the second component 32 are at an angle that does not shift in the circumferential direction. It suffices if they are substantially orthogonal to each other.

The fastening recess 31b of the first component 31 is recessed in a semicircular shape from the other end of the first component 31 toward the inner peripheral side. The corner portion of the fastening recess 31b located on the side of the second component 32 is cut out so as to be inclined so that the guide portion 31d is formed.

The second component 32 has an extension portion 32e extending toward the first component 31 side so that the other end thereof covers the fastening recess 31b of the first component 31. The fastening recess 32b of the second component 32 is recessed in a semicircular shape from the inner peripheral side to the outer peripheral side of the extending portion 32e. The end of the extending portion 32e located on the side of the first component 31 side of the fastening recess 32b is cut out so as to be inclined so that the guided portion 32d is formed.

The first component 31 and the second component 32 have shaft recesses 31c and 32c facing each other between the meshing portions 31a and 32a and the fastening recesses 31b and 32b, respectively. The shaft recesses 31c and 32c have an arc shape along the outer circumference of the connecting shaft 20, and in the shaft recesses 31c and 32c, the gap adjusting shim 30 is attached to the outer circumference of the connecting shaft 20.

<< Installation procedure of gap adjustment shim >>
Next, a method of attaching the gap adjusting shim 30 in the attachment 5 of the present embodiment configured as described above will be described with reference to FIGS. 5 to 7. Note that FIGS. 5 to 7 show only the connecting shaft 20 and the clearance adjusting shim 30 for convenience of explanation.

First, the connecting shaft 20 is inserted by aligning the connecting holes of the two members such as the upper frame 8 and the boom 10. The resin shim 50 is first arranged between the bases of the vertical plate 9 and the boom 10, and the connecting shaft 20 is inserted together with the two members. By moving the boom 10 to either the left or right side between the vertical plates 9 and 9, the gap between the two members is moved to either the left or right side.

Next, the first component 31 is inserted into the gap between the two members, and as shown in FIG. 5, the meshing portion 32a of the second component 32 is brought into contact with the shaft recess 31c along the outer circumference of the connecting shaft 20. The second component 32 is inserted into the gap while meshing with the meshing portion 31a of the first component 31. At this time, the first component 31 is engaged by sliding the outer peripheral side wall of the meshing recess 310 of the first component 31 and the outer peripheral side wall of the meshing convex portion 320 of the second component 32 so as to close the insertion gap 34. And the other end of the second component 32 is in a separated state.

At the other ends of the first component 31 and the second component 32, the guided portion 32d of the second component 32 is guided along the guide portion 31d of the first component 31, so that the two can be easily fastened without interfering with each other. The recesses 31b and 32b can be aligned.

As shown in FIG. 6, if the meshing portions 31a and 32a are engaged with the insertion gap 34 closed, the first component 31 and the second component 32 can be swung in the circumferential direction by the angle of the insertion gap 34. it can. In this way, the fastening holes 33 can be easily formed by aligning the fastening recesses 31b and 32b on the other end side, so that the work of attaching the clearance adjusting shim 30 to the connecting shaft 20 becomes easier.

As shown in FIG. 7, by inserting the fastening member 40 in the fastening hole 33 formed by the fastening recesses 31b and 32b in the axial direction, the first component 31 and the second component 32 are connected and the gap adjusting shim is connected. 30 is attached to the connecting shaft 20. Since the fastening hole 33 for connecting the first component 31 and the second component 32 to each other may be provided at one place, the work can be made more efficient.

As shown in FIG. 3, in the present embodiment, the clearance adjusting shim 30 is fixed by inserting the fastening member 40 into the fastening hole 33 and inserting it into the boom 10 base, but the fastening member 40 is fixed. If the first component 31 and the second component 32 are simply connected by inserting the first component 31 and the second component 32 only through the fastening hole 33 without inserting the member into another member, the present invention can be applied to an existing construction machine.

1 Construction Machinery 5 Attachment 8 Upper Frame 10 Boom 20 Connecting Shaft 30 Gap Adjustment Shim 31 First Part 31a Mating Part 31b Fastening Recess 31c Shaft Recess 32 Second Part 32a Mating Part 32b Fastening Recess 32c Shaft Recess 33 Fastening Hole 34 Gap 40 Fastening member X Axis center of connecting shaft Y Center of fastening hole L1 Alignment line L2 Dividing line

Claims (5)

An attachment of a construction machine having a connecting shaft, two members connected by the connecting shaft, and a gap adjusting shim for adjusting an axial gap generated between the two members.
The gap adjusting shim includes a first component and a second component that are connected to each other in the gap.
The first component and the second component each have a mating portion that can be meshed with each other at one end and a fastening recess that forms a fastening hole facing each other at the other end. And an attachment of a construction machine, which is attached to the outer periphery of the connecting shaft between the fastening recesses. In claim 1,
An attachment for a construction machine, wherein at least a part of the meshing portion is formed within a range in which the sliding portions of the two members overlap when viewed from the axial direction. In claim 1 or 2,
The attachment of a construction machine, wherein the first part and the second part are plate-shaped and are connected so as not to overlap each other when viewed from the axial direction. In any one of claims 1 to 3,
The meshing portion is arranged on a mating line passing through the center of the connecting shaft and the center of the fastening hole.
An attachment for a construction machine, wherein the fastening hole is composed of a pair of fastening recesses facing each other along a dividing line substantially orthogonal to the mating line. In any one of claims 1 to 4,
The meshing portion of the first component and the second component is characterized by having an insertion gap at the outer peripheral side end portion that allows the first component and the second component to swing in a state of being meshed with each other. Construction machinery attachments to do.

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