JP3697367B2 - Work equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a working device such as a backhoe provided with a boom, an arm, and a working tool that are operated by a hydraulic cylinder.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there is a backhoe as a work device provided with a boom, an arm, and a work tool that are actuated (operated) by a hydraulic cylinder, and a work vehicle called TLB1 shown in FIG. 6 is provided with this backhoe.
The TLB 1 is configured by attaching a front loader 3 to the front part of the tractor 2 (traveling vehicle) and a backhoe 4 to the rear part of the tractor 2.
The tractor 2 has a pair of left and right front wheels 5 and a rear wheel 6, and a driver's seat 8 is provided behind the handle 7 so that the posture can be changed between a forward posture and a rearward posture.
[0003]
The vehicle body 2A of the tractor 2 is mainly configured by directly connecting an engine, a flywheel housing, a clutch housing, a transmission case, and the like. The vehicle body 2A has a front loader 3 and a backhoe 4 attached to the tractor 2, and the vehicle body 2A. A reinforcing frame 9 (mounting frame) for reinforcing the above is attached.
The backhoe 4 includes a machine frame 11 that is detachably connected to the reinforcing frame 9. Outriggers 12 are provided on both the left and right sides of the machine frame 11, and a swing frame is provided at the rear of the machine frame 11. The front side of 13 is connected so as to be able to swing left and right around the vertical axis.
[0004]
The swing frame 13 is provided with a base portion 14A of a boom 14 pivotally mounted around a lateral axis through a horizontal shaft 27 so that the boom 14 can swing up and down. A base portion 15A of an arm 15 is pivotally attached to a distal end portion 14B of the boom 14 via a horizontal shaft 28 so as to be pivotable about a horizontal axis, and the arm 15 is swingably provided. A base portion 16A of a bucket 16 as a working tool is pivotally attached to the distal end side of the arm 15 via a horizontal shaft 29 so as to be pivotable around a horizontal axis so that the bucket 16 can swing. Is provided.
[0005]
An operation box 17 is provided on the machine casing 11, and a hydraulic cylinder provided in the backhoe 4 is controlled in the operation box 17 by operating levers 19 and 20 provided in the operation box 17. A control valve 18 is housed (see FIGS. 8 and 9).
The pressure oil is supplied from the hydraulic pump provided in the tractor 2 to the control valve 18 via the hydraulic pipe and the hydraulic hose, and the pressure oil is returned from the control valve 18 to the tractor 2 side. Has been.
[0006]
The outrigger 12, the swing frame 13, the boom 14, the arm 15, and the bucket 16 are hydraulically operated by hydraulic cylinders 21, 22, 23, 24, and 25, respectively. , 23, 24, and 25 are supplied with pressure oil from the control valve 18, and are returned to the control valve 18 from the hydraulic cylinders 21, 22, 23, 24, 25.
As shown in FIG. 7, the main body portion 14 </ b> C between the base portion 14 </ b> A and the distal end portion 14 </ b> B of the boom 14 is configured by a rectangular tubular cylinder.
[0007]
Further, the base portion 14A of the boom 14 is fixed to the right and left sides of the base end side (bottom length direction lower end side) of the main body portion 14C by welding or the like, and protrudes downward from the main body portion 14C to the boom length direction D downward. A pair of left and right side plates 30 and a connecting plate 31 that connects lower E ends of the left and right side plates 30 in a direction substantially perpendicular to the boom length direction D (the vertical swinging direction of the boom 14). The upper side F of the boom base portion 14A in the direction substantially perpendicular to the boom length direction D is open.
The rear side of the swing frame 13 is inserted into the lower side of the boom length direction D between the left and right side plates 30 of the boom base portion 14A, and the lower end side of the boom length direction D of the left and right side plates 30 and the swing frame. The boom shaft 14A is pivotally attached to the swing frame 13 so as to be rotatable about the axis in the left-right direction.
[0008]
The boom cylinder 23 that swings the boom 14 up and down is inserted into the boom 14 from the lower side of the boom length direction D (between the left and right side plates 30), and is substantially at the center of the width of the boom 14 in the left-right direction. Located in the department. One end side of the boom cylinder 23 (the end side on the piston top side of the cylinder main body) is freely rotatable about a horizontal axis through a horizontal shaft 32 in the middle part of the boom main body 14C in the boom length direction D. The other end side (piston rod front end side) of the boom cylinder 23 is inserted into the upper part between the left and right support walls 13A at the rear part of the swing frame 13, and the horizontal shaft 33 is provided above the support wall 13A. The boom 14 is pivoted up and down about the horizontal shaft 27 by extending and retracting the boom cylinder 23.
[0009]
Further, the distal end portion 14B of the boom 14 is fixed to the left and right sides of the distal end side (the upper end side of the boom length direction D) of the main body portion 14C by welding or the like, and protrudes upward from the main body portion 14C upward in the boom length direction D. A pair of left and right side plates 34 is mainly configured, and an intermediate portion in the arm length direction of the base portion 15A of the arm 15 is inserted at the distal end side between the left and right side plates 34. By making the horizontal shaft 28 pass through the arm base portion 15A, the arm base portion 15A is pivotally attached to the boom distal end portion 14B so as to be rotatable about the axis in the left-right direction.
[0010]
The arm cylinder 24 for swinging the arm 15 is disposed on the upper side F of the boom 14 in the direction perpendicular to the boom length direction D (the swing direction of the arm) at a distance from the boom 14. One end side of the arm cylinder 24 (the end side on the piston top side of the cylinder body) is on the upper side F of the boom base direction 14A in the boom length direction D and on the upper side F in the direction substantially perpendicular to the boom length direction D. The other end side (piston rod front end side) of the arm cylinder 24 has a horizontal shaft 36 at the upper end side in the arm length direction of the arm base portion 15A. The arm 15 is pivoted around the horizontal axis 28 by extending and retracting the arm cylinder 24.
[0011]
The bucket cylinder 25 that swings the bucket 16 is disposed on the upper side in the direction orthogonal to the arm length direction of the arm 15 at a distance from the arm 14. One end side of the bucket cylinder 25 (the cylinder body) The piston top end side is pivotally attached to the arm base portion 15A via a horizontal shaft 37 so as to be rotatable about a horizontal axis, and the other end side of the bucket cylinder 25 (piston rod tip side). ) Is pivotally attached to one end side of the pair of links 39, 40 so as to be rotatable about a horizontal axis, and the other end of one link 39 is set to the distal end side of the arm 14 about a horizontal axis. The other end of the other link 40 is pivotally attached to the base 16A side of the bucket 16 so as to be rotatable about the axis in the left-right direction, and the bucket cylinder 25 is expanded and contracted. ,bucket 6 is adapted to swing about a horizontal axis 29.
[0012]
As shown in FIGS. 7 and 8, the hydraulic hose is inserted into the middle part of the boom length direction D of the wall portion on the upper side F in the direction substantially perpendicular to the boom length direction D of the boom main body portion 14 </ b> C. A hose insertion hole 41 is formed.
Supply of pressure oil from the control valve 18 to the boom cylinder 23, arm cylinder 24 and bucket cylinder 25, and return of pressure oil from the cylinders 23, 24, 25 to the control valve 18 are performed by hydraulic hoses 42, 43, 44. These hydraulic hoses 42, 43, and 44 are inserted into the boom 14 from the lower end side in the length direction of the boom 14 (between the left and right side plates 30), as shown in FIGS.
[0013]
The boom hydraulic hose 42 is connected to the boom cylinder 23 in the boom 14, and the arm hydraulic hose 43 is drawn to the outside from the hose insertion hole 41 formed in the main portion 14 </ b> C of the boom 14 and connected to the arm cylinder 24. The bucket (work implement) hydraulic hose 44 is pulled out from the hose insertion hole 41 and connected to the bucket cylinder 25 via a hydraulic pipe 45, a hydraulic hose 46, and the like.
[0014]
[Problems to be solved by the invention]
In the conventional apparatus, when the capacity of the backhoe 4 is increased, if the load during operation acts on the boom 14, the stress at the portion where the hose insertion hole 41 of the boom 14 is formed increases. There is a problem that the structure must be reinforced and the structure becomes complicated and the weight increases.
In addition, when the capacity of the backhoe 4 is increased, the stress acting on the lower side E of the boom base portion 14A in the direction perpendicular to the boom length direction D increases due to the load acting on the boom 14 during work. However, if the thicknesses of the left and right side plates 30 and the connecting plate 31 are increased, there is a problem that the weight is considerably increased.
[0015]
Therefore, in view of the above-described problems, the present invention aims to solve the problem of stress concentration and to secure the strength of the boom, and to consider not to increase the weight significantly.
[0016]
[Means for Solving the Problems]
The technical means taken by the present invention to achieve the above object is that the base portion 14A of the boom 14 is pivotally supported on the machine frame 11 side so as to be swingable up and down, and the arm 15 is swingable on the tip side of the boom 14. The boom base portion 14A is fixed to both the left and right sides of the base end side of the boom length direction D of the cylindrical boom main body portion 14C. The left and right side plates 30 are provided, and lower end portions in a direction substantially orthogonal to the boom length direction D of the left and right side plates 30 are connected by a connection plate 31, and the left and right side plates 30 in the boom length direction D are connected. In the working device in which the lower part is pivotally supported on the machine frame 11 side via the horizontal shaft 27,
The hydraulic pipes 51 and 52 for supplying and returning the pressure oil of the hydraulic cylinders 24 and 25 for operating the arm 15 and the work tool 16 are piped on the upper side F in the direction substantially perpendicular to the boom length direction D of the boom main body 14C. The left and right side plates 30 are connected by a connecting member 47 on the upper side F in the direction D substantially orthogonal to the boom length direction of the connecting plate 31, and hydraulic pressure is provided from a control valve 18 that controls the hydraulic cylinders 24, 25. The hoses 58 and 59 are connected to the hydraulic pipes 51 and 52 through the connecting member 47 and the connecting plate 31.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 illustrates a backhoe 4 employed in a TLB. The parts not shown in the figure are substantially the same as the conventional structure, and the parts similar to the conventional structure in the illustrated structure are the same as the conventional ones. The same reference numerals are given and description thereof is omitted.
1 to 4, the left and right side plates 30 constituting the boom base portion 14A are mainly composed of an outer wall plate 30A and an inner wall plate 30B fixed to the inner surface side of the outer wall plate 30A in the left and right direction by welding or the like. 30A is formed of a member thicker than the inner wall plate 30B (the outer wall plate 30A and the inner wall plate 30B may be integrated).
[0018]
The boom wall length direction D upper end side of the inner wall plate 30B is fixed to the left and right side surfaces of the boom main body portion 14C on the boom length direction D lower end side by welding or the like.
The lower end portion of the outer wall plate 30A in the boom length direction D is pivotally supported by the swing frame 13 via the horizontal shaft 27, and the portion of the inner wall plate 30B corresponding to the pivotal portion of the outer wall plate 30A is cut off. Has been.
In addition, a portion of the outer wall plate 30A corresponding to a portion extending from the upper end of the boom length direction D to the middle is cut off on the lower side in the direction substantially perpendicular to the boom length direction D of the inner wall plate 30B.
[0019]
Further, the connecting plate 31 is provided so as to close between the end portions of the inner wall plate 30B in the direction substantially orthogonal to the boom length direction D of the inner wall plate 30B, and on the lower end side of the boom main body portion 14C in the boom length direction D. Is also fixed by welding or the like.
The left and right side plates 30 are connected by a connecting member 47 arranged in the left-right direction on the lower side of the boom length direction D between the left and right side plates 30 on the lower side in the direction substantially perpendicular to the boom length direction D. The connecting member 47 can effectively reinforce the boom base portion 14A without significantly increasing the weight.
[0020]
In the present embodiment, the connecting members 47 are composed of a plurality (three in the illustrated example) of round bars, and are arranged at intervals in the boom length direction D, respectively. Each connecting member 47 is disposed at a distance from the connecting plate 31. The left and right end portions of each connecting member 47 penetrate the inner wall plate 30B and are fixed to the side plate 30 by welding or the like.
A support member that pivotally supports the end of the cylinder body of the arm cylinder 24 on the piston top side on the upper side F of the boom main body portion 14C on the lower end side in the boom length direction D and in the direction substantially orthogonal to the boom length direction D. 48 is provided.
[0021]
The support member 48 is formed on the upper side F of the boom main body 14C in the direction orthogonal to the boom length direction D from the left and right sides of the bottom wall 48A fixed to the upper surface of the boom main body portion 14C in a direction substantially orthogonal to the boom length direction D. And a support wall 48B that rises toward the end, and the end of the cylinder body of the arm cylinder 24 on the piston top side is pivotally supported between the left and right support walls 48B.
An outer wall plate 30A is fixed to the outer surfaces of the left and right support portions 48B of the support member 48 by welding or the like.
[0022]
The support member 48 protrudes downward from the boom main body portion 14C in the boom length direction D, and is interposed between the left and right side plates 30 on the lower side of the support member 48 in the boom length direction D. A U-shaped reinforcing member 49 for connecting the left and right side plates 30 is disposed.
Further, a pair of hydraulic pipes 51 for supplying / returning pressure oil of the arm cylinder 24 and supply of pressure oil for the bucket cylinder 25 are provided on an upper side F of the boom main body portion 14C in a direction substantially orthogonal to the boom length direction D. A pair of return hydraulic pipes 52 are piped along the boom length direction D. Therefore, a hole for inserting the hydraulic hose is not formed on the upper surface side in the direction orthogonal to the boom length direction D of the boom main body portion 14C of the present embodiment.
[0023]
One end of the hydraulic pipe 51 for the arm cylinder 24 is fixed to a support member 53 fixed to the middle part of the boom main body 14C in the boom length direction D, and is connected to the arm cylinder 24 via a hydraulic hose. In addition, one end side of the hydraulic pipe 52 for the bucket cylinder 25 is fixed to a support member 54 attached and fixed to the side surface of the boom tip 14B, and is connected to the bucket cylinder 25 via a hydraulic hose.
Further, the other end side of the hydraulic pipe 51 for the arm cylinder 24 and the hydraulic pipe 52 for the bucket cylinder 25 protrudes downward in the boom length direction D from the boom main portion 14C, and is detachable from the reinforcing member 49. While being fixed to the reinforcing member 49 by a holding member 55 to be attached, joint members 56 and 57 are provided at the ends, respectively, and the connection ports of the joint members 56 and 57 are below the boom length direction D. Oriented towards E.
[0024]
These joint members 56 and 57 are located within the width between the left and right side plates 30 and are collected on the left and right sides (right side in the illustrated example) of the width 9 of the side plates 30 and along the boom length direction D. Are arranged.
The joint members 56 and 57 are connected to the control valve 18 via hydraulic hoses 58 and 59, respectively. These hydraulic hoses 58 and 59 are taken out from the rear side of the operation box 17 and passed between the left and right support walls 13A on the rear side of the swing frame 13 and between the left and right side plates 30 of the boom base 14A. Inserted from between the shafts 27 and 33, passes between the connecting member 47 at the lowermost end of the boom length direction D and the connecting member 47 at the upper side (intermediate portion), and connects the uppermost end of the boom length direction D and the intermediate portion. It passes between the member 47 and the connecting plate 31 and further passes between the boom cylinder 23 and the right side plate 30 to the joint members 56 and 57.
[0025]
Therefore, the connecting member 47 has a function as a guide for the hydraulic hoses 58 and 59 in addition to a function as a reinforcing member for the boom base portion 14A.
The hydraulic hose provided from the control valve 18 to the boom cylinder 23 is also provided in the same way as the hydraulic hoses 58 and 59 and connected to the boom cylinder 23 in the boom main body 14C.
The joint members 56 and 57 are not gathered on one side in the left-right direction. As shown in FIG. 5, the joint member 56 of one hydraulic pipe 51 is placed on one side in the width between the left and right side plates 30. (The right side in the figure) may be arranged, and the joint member 57 of the other hydraulic pipe 52 may be arranged on the left and right other side (the left side in the figure) within the width between the left and right side plates 30. In this case, the hydraulic hose 58 connected to one joint member 56 passes through the left and right sides (right side) of the boom cylinder 23, and the hydraulic hose 59 connected to the other joint member 57 connects to the left and right other sides of the boom cylinder 23. Pass on the left side.
[0026]
【The invention's effect】
According to the present invention, the hydraulic pipes 51 and 52 for supplying and returning the pressure oil of the hydraulic cylinders 24 and 25 for operating the arm 15 and the work tool 16 are substantially perpendicular to the boom length direction D of the boom main body portion 14C. A control valve 18 that controls the hydraulic cylinders 24 and 25 by connecting the left and right side plates 30 with a connecting member 47 on the upper side F in the direction D substantially perpendicular to the boom length direction of the connecting plate 31. Since the hydraulic hoses 58 and 59 arranged from above are connected to the hydraulic pipes 51 and 52 through the connecting member 47 and the connecting plate 31, it is not necessary to form a hole for inserting the hydraulic hose in the boom 14. At the same time, the boom base portion 14A is reinforced without significantly increasing the weight by the connecting member 47, and even when the capacity of the boom 14 is increased, the strength of the boom 14 can be sufficiently ensured. An effect that member 47 also functions as a guide for the hydraulic hoses 58 and 59.
[Brief description of the drawings]
FIG. 1 is a side view showing a boom, a machine frame, a swing frame and the like of a backhoe according to the present invention.
FIG. 2 is a side sectional view showing the structure of the base side of the boom according to the present invention.
FIG. 3 is a diagram of a boom and a hydraulic pipe as viewed from above in a direction orthogonal to the boom length direction.
FIG. 4 is a side sectional view showing the structure of the base side of the boom according to the present invention.
FIG. 5 is a view showing another example of the hydraulic pipe, and is a view of the boom and of the hydraulic pipe as seen from the upper side in the direction orthogonal to the boom length direction.
FIG. 6 is a side view of a TLB according to a conventional example.
FIG. 7 is a perspective view of a boom or the like according to a conventional example.
FIG. 8 is a perspective view showing an arrangement structure of a conventional hydraulic hose.
FIG. 9 is a perspective view showing an arrangement structure of a conventional hydraulic hose.
[Explanation of symbols]
11 Machine frame 14 Boom 14A Boom base 14C Boom main part 15 Arm 16 Bucket (working tool)
18 Control valve 24 Arm cylinder 25 Bucket cylinder 27 Horizontal shaft 30 Side plate 31 Connection plate 47 Connection member 51 Hydraulic pipe 52 Hydraulic pipe 58 Hydraulic hose 59 Hydraulic hose D Boom length direction

Claims (1)

The base (14A) of the boom (14) is pivotally supported on the machine frame (11) side so as to be swingable up and down, and the arm (15) is pivotally supported on the tip side of the boom (14). A work tool (16) is mounted on the distal end side of (15), and the boom (14) has a cylindrical boom main part (14C) and a boom length direction (D) of the boom main part (14C). and a boom base provided on the base end side (14A), the boom base (14A) is provided with the boom main portion (14C) the base end side of the left and right sides at a fixed left and right side plates (30) In addition, the lower end portions of the left and right side plates (30) in the swing direction of the boom (14) are connected by a connecting plate (31), and the boom length direction (D) of the left and right side plates (30) is formed. In the working device in which the lower part of the machine is pivotally supported on the machine frame (11) side via the horizontal axis (27)
The upper side (F) in the swing direction of the boom (14) between the left and right side plates (30) of the boom base (14A) is open, and the left and right side plates (30) are connected to the connecting plate (31). Are connected by a connecting member (47) on the upper side (F) of the swing direction of the boom (14) and on the upper side of the boom length direction (D) of the horizontal shaft (27), and the arm (15) and the work The hydraulic cylinders (24) and (25) for operating the tool (16) supply and return hydraulic pipes (51) and (52) to the boom main body (14C), and the boom (14) swings. A hydraulic hose (58) disposed on the machine frame (11) side and disposed from a control valve (18 ) for controlling the hydraulic cylinders (24), (25). (59) through the upper side in the boom length direction (D) of the horizontal axis (27) The boom base (14A) is disposed between the left and right side plates (30) and passes between the connecting member (47) and the connecting plate (31 ) in the swing direction of the boom (14). The working device, wherein the working device is disposed in the opening portion on the upper side (F) and connected to the lower end side in the boom length direction (D) of the hydraulic pipes (51) and (52).

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