JP6013286B2 - Work equipment boom - Google Patents

Description

  The present invention relates to a boom of a work machine provided in a work machine such as a backhoe.

  Conventionally, there is a backhoe disclosed in Patent Document 1 as a working machine. In this backhoe, a swing bracket is provided on a swivel so as to be rotatable about a vertical axis, and a base portion of a boom is supported on the swing bracket so as to be movable up and down via a lateral pivot. The boom is provided with a swingable arm, and a bucket is provided at the tip of the arm. The arm and boom provided at the tip of the boom are operated by a hydraulic actuator such as a hydraulic cylinder.

  In such a backhoe, a plurality of hydraulic hoses for supplying hydraulic oil to hydraulic actuators that operate arms, buckets, etc. are arranged from the swivel base to the boom, and the hydraulic hoses are arranged along the outer surface of the boom. Has been placed.

JP 2004-176212 A

  The backhoe of Patent Document 1 has a structure that is arranged along the outer surface of the boom, so that the hydraulic hose may be damaged. Moreover, since it is the structure which arrange | positions a hydraulic hose on the outer side of a boom, there exists a possibility that a visual field during excavation may worsen because a hydraulic hose may become obstructive. Therefore, it is conceivable to install a hydraulic hose in the boom. However, it is necessary to ensure the strength of the boom in a large backhoe, and it is difficult to simply install the hydraulic hose in the boom.

  An object of this invention is to provide the boom which can solve the said problem. It is another object of the present invention to provide a boom for a working machine capable of incorporating a hydraulic hose in a boom body while strengthening the boom body.

The technical means taken by the present invention to solve the technical problems are characterized by the following points.
The invention according to claim 1 includes a boom body in which upper portions of the pair of left and right side wall portions are connected by an upper wall portion, and a lower portion of the left and right side wall portions is connected by a bottom wall portion, A partition is provided in the middle in the longitudinal direction of the main body, a hose hole is formed in the partition for passing a hydraulic hose built in the boom body, and the partition is a lower plate welded to the bottom wall And a vertical plate portion that stands up from the lower plate portion and is welded to the side wall portion, and the hose hole is formed between the vertical plate portion and the vertical plate portion and the lower plate portion. It forms over the said lower board part exceeding a bending part, It is characterized by the above-mentioned.

In the invention which concerns on Claim 2, the said partition is provided with the upper board part bent from the upper end of the said vertical board part, and is extended in the longitudinal direction of the said boom main body, The said hose hole is extended from the said vertical board part to the said vertical board. It is characterized by forming over the upper plate portion beyond the second bent portion between the upper plate portion and the upper plate portion.
The invention according to claim 3 is characterized in that a reinforcing plate for reinforcing the partition is provided between the vertical plate portion and the lower plate portion, and the reinforcing plate is welded to the side wall portion. To do.

In the invention which concerns on Claim 4, the edge part which comprises the hose hole formed in the said lower board part side is made into the non-welded part with respect to the said lower wall part, It is characterized by the above-mentioned.
The invention according to claim 5 is characterized in that the first bent portion is a non-welded portion with respect to the side wall portion.
In the invention which concerns on Claim 6, the said partition is provided in the both sides of the main body bending part formed in the longitudinal direction intermediate part of the said boom main body.

The present invention has the following effects.
According to the invention which concerns on Claim 1, the partition provided with the lower board part welded to the bottom wall part of a boom main body and the vertical board part welded to a side wall part is provided in the longitudinal direction middle part of a boom main body. Therefore, the strength of the boom can be improved by the partition. Moreover, since the hose hole is provided in the partition body, a hydraulic hose such as a hydraulic hose can be provided inside the boom body. In addition, since the hose hole is formed over the lower plate portion beyond the first bent portion of the vertical plate portion and the lower plate portion, the stress applied to the first bent portion of the partition can be dispersed. That is, stress concentration can be avoided.

According to the invention which concerns on Claim 2, after providing the upper board part bent from the upper end of a vertical board part, and extending in the longitudinal direction of a boom main body, a hose hole is made into the said vertical board part and upper board from a vertical board part. Since it forms over the upper board part beyond the 2nd bending part with a part, a hose hole can be enlarged and the stress concerning the 2nd bending part of a partition can be distributed.
According to the invention which concerns on Claim 3, since the reinforcement board which reinforces a partition body is provided between the vertical board part and the lower board part, the rigidity of a partition board can be improved, and also a reinforcement board is a side wall. Since it welds to the part, the intensity | strength of a boom main body can be improved also with the said reinforcement board.

According to the invention which concerns on Claim 4, following the deformation | transformation of a boom main body, the periphery of the edge part of a hose hole can deform | transform.
According to the invention which concerns on Claim 5, the stress concentrated on a 1st bending part can be disperse | distributed.
According to the invention which concerns on Claim 6, the intensity | strength of a boom main body can be improved, and also a hydraulic hose can be easily passed from either the base end side or the front end side of a boom main body.

It is an internal perspective view of a boom. It is an internal side view of a boom. It is the side view and top view of a pivot support body. It is a figure which shows the modification of a partition plate. 1 is an overall side view of a backhoe.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 5 shows a working machine (backhoe) provided with the boom of the present invention.
As shown in FIG. 5, the backhoe 1 includes a lower traveling device 2 and a swivel base 3 (airframe) supported by the traveling device 2 so as to be pivotable about an axis in the vertical direction. The working machine is not limited to the backhoe shown in FIG. Further, in this embodiment, the front side of the driver seated on the driver's seat 7 of the work machine is the front side (left side in FIG. 5), the rear side of the driver is the rear side (right side in FIG. 5), and the left side of the driver is left side. On the other hand, the right side of the driver is on the right side and the explanation proceeds.

The traveling device 2 includes track frames 4 on both left and right sides, and a crawler traveling device 5 is attached to each of the left and right track frames 4.
A cabin 6 is mounted on the swivel base 3, and a driver's seat 7 is provided in the cabin 6. A swing bracket 9 is supported by a support bracket 8 provided at the front portion of the swivel base 3 so as to be swingable in the left-right direction.

  A working device 10 is provided at the front of the swivel base 3. The working device 10 includes a boom 11, an arm 12, and a bucket 13. The base side (base side) of the boom 11 is pivotally supported by the swing bracket 9. The boom 11 is supported by a boom cylinder 17 provided between the swing bracket 9 and the boom 11 so as to be swingable up and down, and the arm 12 is swung by an arm cylinder 15 provided between the boom 13 and the arm 12. The bucket 13 is supported freely, and is supported so as to make a scooping dump by a bucket cylinder 16 provided between the arm 12 and the bucket 13.

As shown in FIGS. 1 to 3, the boom 11 includes a base support 30 whose base (base side) is pivotally supported by the swing bracket 9 and formed by casting, and a base that is connected to the base support 30 and is made of sheet metal. A boom body 31 is formed, and a tip support body 32 that is connected to the tip of the boom body 31 and is formed of a casting.
As shown in FIG. 3, the root support 30 is formed in a bifurcated shape in plan view, and includes a body portion 34 having a hose introduction hole 46 for introducing a hydraulic hose H from the swivel base 3, and the body portion. A pair of left and right leg portions 33 extending from the left and right ends of the portion to the support bracket 8.

The body portion 34 includes a pair of left and right side portions 34A, an upper wall 34U that connects upper portions of the pair of left and right side portions 34A, and a lower wall 34D that connects lower portions of the pair of left and right side portions 34A. A portion surrounded by the pair of left and right side portions 34A, the upper wall 34U and the lower wall 34D is a hose introduction hole 46.
The upper wall 34U includes a dome-shaped dome portion 47 that bulges upward from the upper portion of the side portion 34A. Specifically, the dome portion 47 has a dome shape that gradually moves outward from the center in the left-right direction of the body portion 34 while moving upward from the front side to the rear side of the body portion 34.

A connecting boss portion 35 protruding in the left-right direction is formed on the base side of the pair of leg portions 33, and a mounting hole 36 penetrating in the left-right direction (thickness direction) is formed in the connecting boss portion 35. By inserting the pivot shaft 37 into 36, the base side of the boom 11 is pivotally supported by the swing bracket 9.
The leg portion 33 is formed with a thin-walled portion 40 in which the upper and lower middle portions of the outer surface of the leg portion 33 are recessed in the thickness direction with a predetermined width. The thin portion 40 extends from the rear side to the front side of the connecting boss portion 35, and a pair of thick portions 41 having a large thickness are formed on the top and bottom along the thin portion 40. . The thin portion 40 and the thick portion 41 are extended from the leg portion 33 to the side portion 34A of the trunk portion 34.

  As shown in FIG. 3, the upper thick portion (referred to as the upper thick portion) 41U has a constant vertical dimension (vertical width) from the base side toward the front side, and the vertical width gradually increases in the middle part of the front and rear. It is formed as follows. That is, the upper ridge line 42, which is the boundary between the thin portion 40 and the upper thick portion 41U, extends from the rear side to the front side along the upper surface of the leg portion 33 (the upper surface of the upper thick portion 41U), and at the front and rear intermediate portions, It moves to the lower side as it goes to the front side.

  As shown in FIGS. 1 and 2, the boom body 31 includes a pair of left and right side wall parts 50, an upper wall part 51 that connects the upper parts of the left and right side wall parts 50, and a bottom wall that connects the lower parts of the left and right side wall parts 50. Part 52. The upper wall portion 51, the left and right side wall portions 50, and the bottom wall portion 52 are formed of plate materials, and the boom main body 31 is formed in a box shape (rectangular shape) by welding these end portions and the like to each other. In the description of the boom body 31, the direction from the outside to the inside of the boom body 31 is “inward”, and the direction from the inside of the boom body 31 to the outside is “outward”.

  A space portion 53 is formed in the boom main body 31 from the base end portion to the tip end portion by the upper wall portion 51, the left and right side wall portions 50, and the bottom wall portion 52, and the space portion 53 is formed by the root support 30 (the trunk portion 34). ) Communicated with the hose introduction hole 46 formed in (4). The space 53 can pass the hydraulic hose H guided from the swivel base 3 through the hose introduction hole 46 of the trunk portion 34. Specifically, in the space portion 53, for example, six hydraulic hoses H for supplying hydraulic oil to a service port provided at the tip of the arm cylinder 15, the bucket cylinder 16, and the arm 12 are arranged.

A hydraulic hose introduction hole for introducing a hydraulic hose from the base support 30 side by communicating with the base support 30 is formed on the base end side of the boom body 31.
Moreover, the upper wall part 51, the left and right side wall parts 50, and the bottom wall part 52 are bent in the middle in the longitudinal direction, and the boom main body 31 has a U-shape when viewed from the side. Hereinafter, the bent portion of the boom body 31 is referred to as a bent portion (main body bent portion) 58 for convenience of explanation.

  The vertical width of the left and right side wall portions 50 gradually increases as it goes from the base end portion to the main body bent portion 58, becomes maximum at the main body bent portion 58 of the boom body 31, and gradually increases as it goes from the main body bent portion 58 to the distal end portion. Get smaller. The left and right widths of the upper wall portion 51 and the lower wall portion are substantially the same from the proximal end portion to the distal end portion, and the main body bent portion 58 of the upper wall portion 51 supports the proximal end portion side of the arm cylinder 15. An upper support portion 60 is provided, and a lower support portion 61 that supports the tip end side of the boom cylinder 17 is provided on the main body bent portion 58 of the bottom wall portion 52.

In the boom main body 31 and on both sides of the main body bent portion 58, partition bodies 70 for partitioning the boom main body 31 are provided. That is, the space portion 5 extending from the tip of the boom body 31 to the bent portion.
3 is provided with a partition (first partition) 70F. In the space 53 extending from the main body bent portion 58 of the boom body 31 to the base end portion, a partition (first partition) separate from the first partition 70F is provided. 70R is provided.

  The first partition body 70F and the second partition body 70R are configured in a substantially Z shape in side view by bending two portions in the longitudinal direction of the belt-shaped plate material in opposite directions. The first partition 70F and the second partition 70R are erected via a lower plate portion 71 fixed to the inner surface of the bottom wall portion 52 by welding and a bent portion (referred to as a first bent portion 72D) from the lower plate portion 71. A vertical plate portion 73 welded to the left and right side wall portions 50, and an upper plate portion 74 extending from the vertical plate portion 73 in a direction different from the lower plate portion 71 via a bent portion (referred to as a second bent portion 72U). It has.

A pair of left and right reinforcing plates 75 made of a plate material is provided between the lower plate portion 71 and the vertical plate portion 73.
Specifically, the upper end of the left reinforcing plate (left reinforcing plate) 75L is welded to the lower left end of the vertical plate portion 73, and the lower end of the left reinforcing plate 75L is welded to the upper left surface of the lower plate portion 71. Further, the upper end of the right reinforcing plate (right reinforcing plate) 75R is welded to the lower right end of the vertical plate portion 73, and the lower end of the right reinforcing plate 75R is welded to the upper right surface of the lower plate portion 71. That is, the reinforcing plate 75 is provided across the first bent portion 72 </ b> D between the lower plate portion 71 and the vertical plate portion 73.

The first partition 70F and the second partition 70R having the left reinforcing plate 75L and the right reinforcing plate 75R are welded to the inner surface 50A of the left and right side wall portions 50 and the inner surface 52A of the bottom wall portion 52.
Next, arrangement and welding fixation of the first partition 70F and the second partition 70R will be described.
In the first partition 70F and the second partition 70R, the left and right outer surfaces of the left reinforcing plate 75L and the right reinforcing plate 75R face the inner surface 50A of the left and right side walls 50, and the left reinforcing plate 75L and the right reinforcing plate 75R. The upper surface is a welded portion 76 that is welded to the inner surface 50 </ b> A of the left and right side wall portions 50.

  Further, the lower surface of the lower plate portion 71 faces the inner surface 52A of the bottom wall portion 52, and the base end portion of the lower plate portion 71 is welded to be welded to the inner surface 52A of the bottom wall portion 52 with a predetermined width. It is said that. By welding the base end portion of the lower plate portion 71 to the inner surface 52A of the bottom wall portion 52, a step (boundary portion) between the lower plate portion 71 and the bottom wall portion 52 becomes a gentle shape by the welded portion 80, The hydraulic hose H easily passes from the inner surface 52 </ b> A of the bottom wall portion 52 through the upper surface of the welded portion 80 to the upper surface of the lower plate portion 71.

Further, both left and right end portions of the lower plate portion 71 face the inner surface 50 </ b> A of the left and right side wall portions 50. A range L1 at the left and right ends of the lower plate portion 71 and behind the lower welded portion 81 where the left reinforcing plate 75L and the right reinforcing plate 75R are welded is welded to the inner surface 50A of the side wall portion 50. .
Note that the side wall portion 50 extends from the lower welded portion 81 to the bending end point 89 where the first bent portion 72D ends (opposite the bending start point 86 to be described later) at both left and right ends of the lower plate portion 71. The inner surface 50A may be welded. In other words, the portions where the lower plate portions 71 and the lower ends of the left reinforcing plate 75L and the right reinforcing plate 75R are in contact may be welded to the inner surface 50A of the left and right side wall portions 50.

  The first bent portion 72D has an arc shape (R-shaped), and both left and right end portions of the first bent portion 72D face the inner surface 50A of the side wall portion 50, and the first bent portion 72D does not perform welding. The non-welded portion 82 is used. In the first bent portion 72D, the range from the bending start point 86 to the bending end point 89 is a non-welded portion 82 that is not welded to the inner surface 50A of the left and right side wall portions 50.

The left and right end portions of the vertical plate portion 73 face the inner surface 50A of the side wall portion 50 on the same side in the left-right direction. At both left and right ends of the vertical plate portion 73, the upper side of the upper welded portion 83 to which the left reinforcing plate 75L and the right reinforcing plate 75R are fixed by welding is welded to the inner surface 50A of the left and right side wall portions 50.
In addition, you may weld to the inner surface 50A of the side wall part 50 in the left-right both ends of the vertical board part 73, and the range from the upper welding part 83 to the bending start point 86. FIG. In other words, the portions where the front ends of the left reinforcing plate 75L and the right reinforcing plate 75R are in contact with the vertical plate portion 73 may be welded to the inner surface 50A of the left and right side wall portions 50.

Further, the second bent portion 72U has an arc shape (R-shaped), and both left and right end portions of the second bent portion 72U face the inner surface 50A of the side wall portion 50, and both left and right ends of the second bent portion 72U. The part is welded.
As described above, the lower plate portion 71 is welded and fixed to the bottom wall portion 52, and both left and right end portions of the vertical plate portion 73 are fixed to the side wall portion 50 by welding, whereby the first partition 70F and the second partition 70R. Is mounted in the boom body 31.

A hose hole 85 through which the hydraulic hose H housed in the boom body 31 is passed is formed at least in the vertical plate portion 73 of the first partition 70F and the second partition 70R.
Specifically, the hose hole 85 penetrates the central portion in the left-right direction of the vertical plate portion 73 over the entire upper and lower regions (the entire region from the upper end of the vertical plate portion 73 to the lower end of the vertical plate portion 73), and subsequently the first bent It has a shape that penetrates the entire region of the central portion in the left-right direction of the portion 72D and the second bent portion 72U, and further penetrates the lower plate portion 71 and the upper plate portion 74. That is, the hose hole 85 extends from the vertical center portion of the vertical plate portion 73 toward the first bent portion 72D, travels along the first bent portion 72D, and passes through the first bent portion 72D to reach the lower plate portion. 71 extends further from the center in the vertical direction of the vertical plate portion 73 toward the second bent portion 72U, proceeds along the second bent portion 72U, and exceeds the second bent portion 72U. It extends until it reaches the plate portion 74.

  More specifically, when the hose hole 85 is viewed from the side, one end side of the hose hole 85 is positioned closer to the lower plate portion 71 than the bending start point (the portion where the radius is started) 86 where the first bent portion 72D starts. Thus, the other end side of the hose hole 85 is located on the upper plate portion 74 side with respect to the bending start point (the portion where the radius begins) 87 where the second bent portion 72U starts. That is, the lower end of the hose hole 85 enters the first bent portion 72D from the lower end of the vertical plate portion 53, and further has a shape in which the lower plate portion 71 enters the thickness direction.

An edge portion 88 that constitutes the hose hole 85 and faces the bottom wall portion 52 is a non-welded portion that is not welded to the bottom wall portion 52. As shown in FIG. 1, the edge 88 (the edge forming the hose hole 85 formed on the lower plate portion 71 side) constituting the base end of the hose hole 85 that has entered the lower plate portion 71 is the bottom wall. The portion 52 is not welded to the portion 52.
As described above, according to the boom body 31, the partition bodies 70 (the first partition body 70 </ b> F and the second partition body 70 </ b> R) are provided on both sides of the body bending portion 58 of the boom body 31, and the hose holes 85 are provided in the partition body 70. Therefore, the hydraulic hose H is moved in the longitudinal direction in the boom body 31 by moving the distal end of the hydraulic hose H inserted from the proximal end side or the distal end side of the boom body 31 toward the hose hole 85. Can be easily passed along.

  In addition, since the partition body 70 is formed in a substantially Z shape including the lower plate portion 71, the vertical plate portion 73, and the upper plate portion 74 and is welded and attached to the inner surface of the boom body 31, the partition body 70. Thus, the strength of the entire boom can be improved. In addition, the hose hole 85 is not simply formed in the partition body 70, but is formed over the lower plate portion 71 beyond the first bent portion 72D of the vertical plate portion 73 and the lower plate portion 71. The stress applied to the first bent portion 72D of the body 70 can be dispersed to avoid stress concentration. Furthermore, since the hose hole 85 is formed over the upper plate portion 74 beyond the second bent portion 72U of the vertical plate portion 73 and the upper plate portion 74, the hose hole 85 can be enlarged and hydraulic pressure can be increased. The hose can be easily passed through the boom main body 31, and the stress applied to the first bent portion 72D and the second bent portion 72U of the partition 70 can be dispersed to avoid stress concentration.

Further, since the reinforcing plate 75 is provided, the rigidity of the partition plate can be improved, and since the reinforcing plate 75 is welded to the left and right side wall portions 50, the strength of the boom body 31 is also increased by the reinforcing plate 75. Can be improved.
FIG. 4 shows a modified example of the partition body 70. As shown in FIG. 4, the lower plate portion 71 welded to the bottom wall portion 52 of the partition 70 and the vertical plate portion 73 standing from the lower plate portion 71 and welded to the left and right side wall portions 50 are omitted in side view. You may comprise in L shape. In this case, it is desirable to provide a hose hole 85 in the vertical plate portion 73 and extend the hose hole 85 from the vertical plate portion 73 to the lower plate portion 71 beyond the first bent portion 72D.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

1 Working machine (backhoe)
31 Boom body 50 Side wall 51 Upper wall 52 Bottom wall 70 Partition 71 Lower plate 73 Vertical plate 85 Hose hole

Claims (6)

A boom body is provided, wherein the upper part of the pair of left and right side wall parts is connected by an upper wall part, and the lower part of the left and right side wall parts is connected by a bottom wall part, and is partitioned in the middle of the boom body in the longitudinal direction within the boom body. Providing a body, forming a hose hole through which the hydraulic hose built in the boom body passes,
The partition includes a lower plate portion welded to the bottom wall portion, and a vertical plate portion standing up from the lower plate portion and welded to the side wall portion, and the hose hole is connected to the vertical plate portion. The boom is characterized by being formed over the lower plate portion beyond the first bent portion between the vertical plate portion and the lower plate portion.   The partition includes an upper plate portion that is bent from an upper end of the vertical plate portion and extends in a longitudinal direction of the boom body, and the hose hole is provided between the vertical plate portion and the upper plate portion from the vertical plate portion. The boom according to claim 1, wherein the boom is formed over the upper plate portion beyond the second bent portion.   The reinforcing plate for reinforcing the partition is provided between the vertical plate portion and the lower plate portion, and the reinforcing plate is welded to the side wall portion. Boom.   The boom according to claim 1 or 2, wherein an edge portion forming a hose hole formed on the lower plate portion side is a non-welded portion with respect to the lower wall portion.   The boom according to any one of claims 1 to 4, wherein the first bent portion is a non-welded portion with respect to the side wall portion.   The boom according to any one of claims 1 to 5, wherein the partition body is provided on both sides of a main body bent portion formed in a midway portion in the longitudinal direction of the boom main body.

Images