JP2001140276A - Loader work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform loader work smoothly by preventing the field of forward vision of a worker from being obstructed by hydraulic hoses slacked and arranged between the base-end side of a boom and a boom supporting body and to prevent the hydraulic hoses from degrading the appearance of the loader work machine. SOLUTION: In this loader work machine, a boom is supported at the vehicle body of a travelling motor vehicle via a boom supporting body, and hydraulic hoses are provided between the boom supporting body and the base-end side of the boom. The hydraulic hoses are slacked and arranged in such a way as to be curved downward.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loader working machine in which a working device such as a front loader is mounted on a traveling vehicle such as a tractor.

[0002]

2. Description of the Related Art Conventionally, as a loader working machine, as shown in FIG. 11, a boom support 71 is provided on a body of a tractor so as to protrude upward, and the boom support 71 is provided with a bucket at a tip end side. There is one that pivotally supports the proximal end of 73. The boom 73 includes the boom 73 and the boom support 7.
1 is swung up and down by a boom cylinder 74 interposed therebetween. A bucket cylinder is arranged on the tip end side of each boom 73, and the bucket is configured to perform a squeeze / dump operation by expansion and contraction of the bucket cylinder.

A control valve B is mounted on the boom support 71.
The boom cylinder 74 and the bucket cylinder are controlled by operating the control valve B. Further, as shown in FIG. 11, hydraulic pipes 77 and 78 for supplying and returning hydraulic oil are provided in the boom 73. One hydraulic pipe 77 is for left and right bucket cylinders, and the other hydraulic pipe 7
Reference numeral 8 denotes left and right boom cylinders 74. The rear ends of the hydraulic pipes 77 and 78 are hydraulic hoses 81 and 8 respectively.
The other end is connected to a bucket cylinder and a boom cylinder 74 via hydraulic hoses, respectively.

However, this type of conventional loader working machine is
The rear ends of the hydraulic pipes 77 and 78 are formed straight, and the hydraulic hoses 81 and 82 are curved upward so as to project upward from the boom 73.

[0005]

Therefore, in the above-mentioned conventional apparatus, the hydraulic hoses 81, 82 are curved upward so as to protrude upward from the boom 73. It protrudes upward from the upper end edge of the boom 73, and is used when the loader works or the like.
1, 82 hinders the field of view in front of the operator, and there is a possibility that the loader operation cannot be performed smoothly. Also, the appearance of the loader working machine when viewed from the side was poor.

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a hydraulic hose disposed so as to be slack between a base end side of a boom and a boom support without obstructing a forward view of an operator. Can be performed smoothly,
This is to prevent the hydraulic hose from deteriorating the appearance of the loader working machine.

[0007]

The technical means taken by the present invention to achieve the above object is that a boom is supported on a vehicle body of a traveling vehicle via a boom support, and a boom support and a base of the boom are provided. In the loader working machine provided with a hydraulic hose between the end side and the hydraulic hose, the hydraulic hose is slackly disposed so as to be curved downward. Further, another technical means is that a boom provided with a working tool on a tip end side is supported on a vehicle body of a traveling vehicle via a boom support,
A control valve for controlling hydraulic equipment is provided on the boom support, a hydraulic pipe is provided on the boom, and a hydraulic hose for connecting the control valve and the hydraulic pipe is provided between the boom support and the base end of the boom. In the loader working machine in which the control valve is operated to control the boom cylinder and the working tool cylinder, the hydraulic hose connection side of the hydraulic pipe is inclined so as to shift downward toward the tip. Wherein the hydraulic hose is disposed so as to be slackened downward.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 3, reference numeral 1 denotes a loader working machine in which a front loader 3 is mounted on a front portion of a tractor (traveling vehicle) 2. The vehicle body 4 of the tractor 2 has a main structure in which a clutch housing is connected to the rear of the engine and a transmission case is connected to the rear of the clutch housing.
And a pair of left and right rear wheels 8 serving as driving wheels.

The engine is housed in a front bonnet 5 and a front axle frame 6 projecting forward from the engine is attached and fixed to the left and right side surfaces of the lower part of the engine by bolts or the like. The front wheel 7 is supported via a front axle, a front axle case, and the like. A rear axle case 9 for supporting a rear wheel 8 via a rear axle or the like is fixed to the left and right sides of the rear part (rear part of the transmission case) of the vehicle body 4 so as to protrude outward in the left-right direction. A driver's seat 10 is provided above the rear part of the vehicle body 4, and a control handle 11 is provided in front of the driver's seat 10.

The front loader 3 mainly includes a frame 12, a boom 13, and a bucket (work implement) 14. As shown in FIGS. 3 to 6, the frame 12 includes a support 15 disposed on the front side of the vehicle body 4 so as to protrude outward in the left-right direction from the vehicle body 4, and attaches the support 15 to the vehicle body 4. A mounting bracket 16 for mounting and fixing;
5, a boom support 17 provided to protrude upward from the support 15, and a boom support 17 disposed in the front-rear direction on the side of the vehicle body 4, wherein a front end is fixed to the support 15 and a rear end is fixed to the rear of the vehicle 4. And a pair of left and right sub-frames 18.

In the present embodiment, the support base 15 is made of a cylindrical pipe having an axial center in the left-right direction. The inner end side of the support base 15 in the left-right direction is fixed to the mounting bracket 16 by welding or the like. And this mounting bracket 16
Is made of a plate material or the like, and is attached and fixed to the vehicle body 4. Specifically, the mounting bracket 16 has a front portion fixed to a side surface of the former shaft frame 6 by a bolt or the like.
The upper and middle portions of the rear portion are directly fixed to the vehicle body 4 by bolts or the like, and the lower rear portions of the left and right mounting brackets 16 are connected by a connection frame (not shown), which is mounted on the lower surface side of the vehicle body 4. Fixed.

The boom support 17 is mainly composed of a main frame 19 fixed to the left and right outer ends of the support base 15 and a side frame 20 detachably attached to the main frame 19. The main frame 19 is formed in an open U-shape in front of a flat cross section from the left and right side walls 19a and the back wall 19b. The support shaft 21 in the direction is fixed, and an insertion hole 22 penetrating the left and right side walls 19a is formed in the upper part.

On the lower end side of the main frame 19,
The left and right outer ends of the support base 15 pass through the left and right side walls 19a and are fixed by welding or the like. In addition, a reinforcing plate 23 that connects the left and right side walls 19 a is provided below the main frame 19, and the main frame 19, the mounting bracket 16, and the support base 15 are welded between the main frame 19 and the mounting bracket 16. Reinforcement plates 24 and 25 fixed by the like are provided. Side frame 20
Is formed in an open U-shape in front of a flat cross section from the left and right side walls and the rear wall. Reinforcement plates 26 and 27 are provided between the left and right side walls, and a lower front portion between the left and right side walls is provided. A fitting member 28 is provided on the side, and the fitting member 28 is provided with an arcuate concave portion 29 that is open downward and extends between the left and right side walls.

The left and right side frames 20 are connected by a connector 41 shown in FIG. As shown in FIG. 8, insertion holes 31, 32, 33 penetrating the left and right side walls are formed before and after the upper part and the middle part in the vertical direction of the side frame 20. Then, as shown in FIGS. 4, 7, and 9,
With the concave portion 29 of the side frame 20 fitted to the support shaft 21 of the main frame 19 from above, the side frame 2
The insertion hole 33 on the rear side of the middle part in the up-down direction of the main frame 19 coincides with the insertion hole 22 of the main frame 19, and the connection pin 34 is inserted through the insertion holes 22 and 33, so that the side frame 20 is inserted. Are fixed to the main frame 19.

The left and right side walls 1 of the main frame 19
A boss guide 36 on the outer surface side of the side frame 20 to which a boss 35 provided at the edge of the insertion hole 33 is fitted is provided at the upper portion on the inner surface side of 9a. An L-shaped engaging member 37 is fixed to the left and right outer ends of the connecting pin 34. The engaging member 37 is bent inward in the left-right direction to form an L-shape. On the other hand, the bent portion of the engaging member 37 Are formed, and inside the side wall 19a on the outer side in the left-right direction of the main frame 19,
The engagement pin 37 is engaged with a retaining member 38 such as a β-pin so that the connecting pin 34 is retained.

When the side frame 20 is separated from the main frame 19, the connecting pin 34 is pulled out of the insertion holes 22 and 33.
On the upper rear side of the side wall outer surface on the left and right outer sides,
A pin holder 40 made of a cylindrical body is provided,
After the connecting pin 34 is pulled out from the insertion holes 22 and 33, the bent portion of the engaging member 37 is inserted into the pin holder 40, and the retaining member 38 is engaged with the engaging member 37 to thereby engage the engaging member 37. Is prevented from coming out of the pin holder 40 so that the connecting pin 34 is held by the pin holder 40.

As described above, by holding the connecting pin 34 on the pin holder 40 when not in use, the connecting pin 3
4 is prevented from being lost. Further, the pin holder 40 and the like are provided in a place where the hand can be reached while riding on the tractor 2, and the connecting pin 34 is inserted into and removed from the insertion holes 22 and 33, and the pin holder 40 is held by the tractor 2. 2 can be done while riding. The boom 13 is provided in a pair of left and right sides, and a base end side (rear end side) is pivotally attached to the side frame 20 so as to be rotatable around a left-right axis by a pin inserted into the insertion hole 31 of the side frame 20. A bucket 14 is pivotally mounted on the distal end side of the boom 13 so as to be rotatable about a left-right axis.

The front sides of the left and right booms 13 are mutually connected by a connecting pipe 42. A portion of the side frame 20 where the insertion hole 32 is formed serves as a connecting portion of the hydraulic cylinder, and a boom cylinder 43 is interposed between the connecting portion and a middle portion of the boom 13. The boom 13 is configured to swing up and down. On the upper front side of each boom 13,
A bucket cylinder 44 is disposed, a base end side of the bucket cylinder 44 is pivotally connected to a middle part of the boom 13, and a pair of links 45 is pivotally connected to a distal end side of the bucket cylinder 44, and one link 45 is connected to the bucket 14. The other link 45 is pivotally connected to the boom 13 so that the bucket 14 can be squeezed and dumped by the expansion and contraction of the bucket cylinder 44.

The sub-frame 18 is formed of a long plate, and is arranged on the lower side of the vehicle body 4 in the front-rear direction from the front to the rear. The front portion of the sub-frame 18 includes the main frame 19 and the mounting bracket 1.
6 is fixed to the bracket 46 fixed by welding or the like to the bracket 46 fixed to the support base 15 by being fitted to the support base 15 so as to be connected and fixed to the support base 15. Note that the bracket 46 may be formed integrally with the subframe 18. Further, the rear end side of the subframe 18 is fixed to a bracket 47 fixed to the rear axle case 9 and the like by bolts or the like, so as to be connected and fixed to the vehicle body 4.

The rear end of the subframe 18 may be directly fixed to the vehicle body 4 or may be fixed to another member mounted and fixed to the vehicle body 4 side. In the case of a type in which a backhoe can be mounted on the rear part of the tractor 2, the rear end of the subframe 18 may be connected and fixed to a backhoe mounting frame that is mounted and fixed to the rear axle case 9.
As shown in FIGS. 5 and 6, between the main frame 19 and the sub-frame 18, these main frames 19 are provided.
And a reinforcing member 48 made of a plate material or the like (connecting the main frame 19 and the sub frame 18) fixed by welding or the like over the sub frame 18 and the bracket 46.
L, 48R, and the reinforcing members 48L, 4
8R disperses the load acting on the main frame (boom support 17) 19 from the boom 13 side to the sub-frame 18 at the time of work or the like.
The configuration is such that the stress of the portion fixed to the support base 9 of the base 9 does not increase.

Thus, there is no problem even if there is no brace. By not providing a brace, maintenance of the inside of the hood 5 of the tractor 2 and the like is facilitated, visibility is improved, and appearance is improved. The reinforcing members 48L and 48R are provided from the support shaft 21 to the front portion of the subframe 18, and the reinforcing members 4L and 48R are provided.
The left and right outer sides of 8L and 48R are the main frame 19
Are welded and fixed to the outer surface of the side wall 19a and the outer surface of the back wall 19b on the inner side in the left-right direction.

Also, one of the right and left sides (the right side in the present embodiment)
The front side of the reinforcing member 48R is formed to be wide in the left-right direction. When the reinforcing member 48R mounts a cabin (not shown) on the vehicle body 4, the boom cylinder 43 and the bucket cylinder (working cylinder) The valve stay is a valve stay for mounting and fixing a control valve B for controlling the control valve 44. Therefore, on the right side of the frame 12, the valve stay also serves as the reinforcing member 48R.

When a cabin is mounted on the vehicle body 4,
An operating means for operating the control valve B is provided near the driver's seat in the cabin, and the operating means and the control valve B are linked and connected by a wire or the like. As shown in FIGS. 3 and 1, when the cabin is not mounted on the vehicle body 4, the valve stay 49 fixed to the upper left side of the right (one of right and left) main frame 19 is inwardly located in the left-right direction.
The control valve B is attached to the valve stay 49, and an operating means 50 having an operating lever is attached to the valve stay 49. By operating the control valve B with the operating means 50, the boom cylinder 43 and the bucket cylinder 44 are moved. It is controlled.

As shown in FIG. 1, hydraulic pipes 51 and 52 for supplying and returning hydraulic oil are provided on the inner surface in the left-right direction of the right boom 13 and the upper surface of the connecting pipe 42. . One hydraulic pipe 51 is for left and right bucket cylinders 44, and the other hydraulic pipe 52 is for left and right boom cylinders 43. The rear ends of these hydraulic pipes 51, 52 are connected via hydraulic hoses 53, 54, respectively. The other end is connected to a bucket cylinder 44 and a boom cylinder 43 via hydraulic hoses, respectively.

As shown in FIG. 2, a mounting plate 61 is fixed to the middle part of the hydraulic pipes 51 and 52 by welding or the like, for example, on the inner surface in the left-right direction of the right boom 13.
The middle part of the hydraulic pipes 51 and 52 is arranged on the outer surface of
A fixing plate 62 is disposed so as to sandwich a middle part of the hydraulic pipes 51 and 52 between the mounting plate 62 and a nut 63 is fixed to an outer surface of the mounting plate 61. The bolts 65 are inserted through the mounting holes 64 of the fixing plate 62, and the bolts 65 are screwed into the nuts 63 of the mounting plate 61 and tightened, so that the hydraulic pipes 51,
The middle part 52 is pinched and fixed.

The bolts 65 and the nuts 63 are disposed between the hydraulic pipes 51 and 52 so that the bolts 65 and the nuts 63 can restrict the hydraulic pipes 51 and 52 from approaching each other. Hydraulic pipe 5
1, 52 rear end side (hydraulic hose connection side) 51a, 52b
Is bent so as to be inclined downward toward the rear, and the front ends of the hydraulic hoses 53 and 54 are connected via a hydraulic coupler 55 and the like.
Further, the control valve B is arranged in an inclined shape that moves upward as it goes rearward, and a pressure oil inlet / outlet port is formed on its upper surface side, and the port has an angle of 45 ° with respect to a straight line. 45 ° bent adapter 5
6 is connected, the distal end side of the adapter 56 is inclined forward or downward, and the path of the pressure oil is changed so as to be directed forward, and the rear ends of the hydraulic hoses 53 and 54 are connected to the adapter 56. The side is connected via a hydraulic coupler 57 and the like.

In the above structure, the hydraulic pipe 5
Hydraulic hoses 53, 54 are formed by bending rear ends 51a, 52b of the hydraulic hoses 53, 52 downward and connecting a 45 ° adapter 56 to a port on the control valve B side.
The hydraulic hoses 53 and 54 are slackened so that the hydraulic hoses 53 and 54 are bent downward, so that the hydraulic hoses 53 and 54 do not protrude upward from the boom 13. Therefore,
Even if the boom 13 is swung up and down, the hydraulic hoses 53, 54
Is stored below the upper end edge of the boom 13 and does not protrude upward, so that the hydraulic hose 53,
54 does not obstruct the field of view in front of the operator, and the loader operation can be performed smoothly. Also,
Since the hydraulic hoses 53 and 54 are accommodated below the upper end edge of the boom 13, the appearance when the loader working machine 1 is viewed from the side becomes very good.

The reason why the hydraulic hoses 53 and 54 are slackened is that the side frame 20 is attached to the main frame 19.
When the hydraulic hoses 53 and 54 are detached from the main frame 19 by operating the boom cylinder 43 and the like, the hydraulic hoses 53 and 54 are connected to the side frame 20.
Is attached to the main frame 19, the length is formed to have a certain margin. Also,
The hydraulic hoses 53 and 54 are made of a cloth 6 or the like, and the ends of which are detachably adhered to each other by a hook-and-loop fastener.
8 so that the hydraulic hoses 53,
54 are bound by a covering 68 so as not to vary.

The boom support 17 may be composed of only the side frame 20, and the side frame 20 may be fixed to the support 15 by welding or bolts (ie, the side frame 20 and the main frame 19). In this case, the reinforcing member is fixed over the side frame 20 and the sub-frame 18. FIG. 10 shows another embodiment, and the rear ends 51 of the hydraulic pipes 51 and 52 are the same as in the above embodiment.
a, 52b are bent so as to be inclined so as to move downward as they go rearward.
The front ends of the hydraulic hoses 53 and 54 are connected via the like. Further, the control valve B is arranged in an inclined shape that shifts upward as it goes rearward.
A pressure oil inlet / outlet port is formed on the upper surface side, and a straight adapter 56 is connected to the port instead of a 45 ° adapter bent at an angle of 45 ° with respect to a straight line as in the above embodiment. The distal end side of the adapter 56 is inclined in a forward rising direction, and the rear ends of the hydraulic hoses 53 and 54 are connected to the adapter 56 via a hydraulic coupler 57 and the like. Therefore, in this case, as shown in FIG.
After being slightly curved upward from the hydraulic coupler 57 from the side, it is largely curved downward.
Also in this case, the hydraulic hoses 53, 54 are accommodated below the upper end edge of the boom 13 and do not protrude upward, as in the case of the above-described embodiment. Does not obstruct the view ahead of the operator, and the loader operation can be performed smoothly. Further, since the hydraulic hoses 53 and 54 are accommodated below the upper end edge of the boom 13, the appearance when the loader working machine 1 is viewed from the side becomes very good.

[0030]

According to the present invention, the hydraulic hose disposed between the base end side of the boom and the boom support is slackly disposed so that the hydraulic hose is bent downward, and the upper end of the boom 13 is provided. It can be prevented from protruding above the rim,
Therefore, the hydraulic hose does not obstruct the field of view in front of the operator, and the loader operation or the like can be performed smoothly. Further, since the hydraulic hose can be prevented from protruding above the upper end edge of the boom 13, the hydraulic hose does not deteriorate the appearance of the loader working machine.

[Brief description of the drawings]

FIG. 1 is a side view of a piping structure of a front loader showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line BB of FIG. 1;

FIG. 3 is a right side view of the loader working machine.

FIG. 4 is a side view of the right boom support when viewed from the left.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

FIG. 6 is a sectional view corresponding to FIG. 5 of a left main frame, a reinforcing member, and the like.

FIG. 7 is a side view of the right boom support viewed from the right.

FIG. 8 is a side view when the right side frame is detached from the main frame.

FIG. 9 is a partial cross-sectional rear view of a pin connection portion of the boom support.

FIG. 10 is a side view of a piping structure of a front loader according to another embodiment.

FIG. 11 is a side view showing a piping structure of a conventional front loader.

[Description of Signs] 2 Tractor (traveling vehicle) 4 Body 13 Boom 14 Bucket (Work implement) 17 Boom support 43 Boom cylinder 44 Bucket cylinder (Work cylinder) 51 Hydraulic pipe 52 Hydraulic pipe 53 Hydraulic hose 54 Hydraulic hose

 ──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Koichi Kawaguchi 64 Ishizukitamachi, Sakai-shi, Osaka F-term in Kubota Sakai Works Co., Ltd. (Reference) 2D012 BA00 EA01 2D015 BA01

Claims (2)

[Claims] 1. A loader working machine in which a boom is supported on a vehicle body of a traveling vehicle via a boom support, and a hydraulic hose is provided between the boom support and a base end of the boom. Characterized in that the loader working machine is disposed so as to be curved downward. 2. A boom having a working tool at a tip end side is supported on a vehicle body of a traveling vehicle via a boom support, and a control valve for controlling a hydraulic device is provided on the boom support, and a hydraulic pipe is provided on the boom. A hydraulic hose for connecting a control valve and a hydraulic pipe is provided between the boom support and the base end side of the boom, and controls the boom cylinder and the working tool cylinder by operating the control valve. In the loader working machine as described above, the hydraulic hose connection side of the hydraulic pipe is inclined so as to shift downward toward the tip, and the hydraulic hose is disposed so as to be slack so as to curve downward. A loader working machine, characterized in that: