JP2001081808A - Piping structure of hydraulic pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a piping structure of a hydraulic pipe which can store the hydraulic pipe in a compact size with room in an arm bracket. SOLUTION: In this pipe structure of a hydraulic pipe in which a boom 2 of a front attachment 1 and an arm 3 are connected to each other through a pin 10, and a hydraulic hose 14 is stretched between the boom 2 and the arm 3 through a pair of arm brackets 11 provided on the rear end part of the arm, the upper surface of the boom tip part is formed as a descending inclined surface 2c, and the hydraulic hose 14 is fixed along the inclined surface 2c to a fixed part 15 provided on the inclined surface 2c.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front attachment mounted on a construction machine such as a hydraulic shovel or the like, and more particularly to a piping structure of a hydraulic pipe disposed along the front attachment.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, a front attachment 50 of a hydraulic shovel includes a boom 51 provided at a front portion of an upper revolving structure (not shown), an arm 52 connected to a tip portion thereof, The boom 51 is raised and lowered by a boom cylinder 54, the arm 52 is pushed or pulled by an arm cylinder 55, and the bucket 53 is moved forward and backward by a bucket cylinder 56. It rotates in the direction.

[0003] From the hydraulic pump to the bucket cylinder 56
Hydraulic oil and return oil supplied to the boom side wall are supplied to the metal tubes 57a and 57b and the hydraulic hose 5
8a, 58b, etc., the bucket cylinder 56
Or returned from the bucket cylinder 56.

[0004]

In the above-mentioned conventional hydraulic pipe piping structure, the hydraulic hose 58 is provided between the boom 51 and the arm 52 so that the operation of the arm 52 can be followed.
a and 58b are bent and provided with a margin.

However, the hydraulic hose 58
If the hydraulic hoses 58a and 58b are exposed without being fixed, the exposed hydraulic hoses 58a and 5b may be easily caught by obstacles or the like during work, and the hydraulic hoses 58a and 58b may be damaged. Further, since the hydraulic hoses 58a and 58b are hung so as to hang down, there is a problem that appearance is poor.

To prevent the hydraulic hose from being exposed on the side of the front attachment, the hydraulic hoses 58a and 58b are connected to a pair of arm brackets 61 and 6 as shown in FIG.
1 is known. However, in a piping structure in which the hydraulic hoses 58a, 58b are simply bent in an inverted U shape in the arm brackets 61, 61, the hydraulic hoses 58a, 58b greatly bulge upward during the arm pushing operation shown in FIG. Conversely, when the arm is retracted, the hydraulic hoses 58a and 58b are pulled, and the hydraulic hose 58
a, 58b is disadvantageously increased. In addition, the hydraulic hoses 58a, 58b cannot be completely stored in the arm brackets 61, 61, and the appearance has not been improved.

It has been considered to increase the height of the arm brackets 61, 61 in order to hide the bulging of the hydraulic hoses 58a, 58b. However, when the size of the arm brackets 61, 61 is increased, the weight of the front attachment increases. Therefore, the operability is reduced, and the enlarged arm bracket itself easily collides with an obstacle.

In a hydraulic excavator to which optional equipment such as a crusher can be mounted, it is necessary to equip two hydraulic pipes for optional equipment in addition to two hydraulic pipes (standard equipped hydraulic pipes) leading to the bucket cylinder. Yes, a total of four hydraulic tubes must be passed through the arm bracket.
However, in the piping structure shown in FIG. 6, it is impossible to secure a space for passing the optional device hydraulic pipe in the arm brackets 61, 61.

The present invention has been made in consideration of the above-mentioned problems in the conventional hydraulic pipe piping structure. A first object of the present invention is to provide a hydraulic pipe in a state where it has a margin to follow the arm operation. The second purpose is to store hydraulic pipes for optional equipment in addition to the standard hydraulic pipes in the arm bracket. It is an object of the present invention to provide a piping structure of a hydraulic pipe that can be used.

[0010]

According to a first aspect of the present invention, a boom and an arm of a front attachment are connected via a connecting pin, and flexibility is provided through a pair of arm brackets provided at a rear end of the arm. In a hydraulic pipe piping structure in which a hydraulic pipe having a boom is bridged from an arm to a boom, an upper surface of a boom tip portion is formed on a downwardly inclined surface, and a hydraulic pipe is provided along a fixed portion provided on the inclined surface. A hydraulic pipe piping structure characterized by being fixed to a hydraulic pipe.

According to a second aspect of the present invention, the arm bracket is welded to the outer surface of the side wall at the rear end of the arm, so that the distance between the pair of arm brackets through which the hydraulic tube passes is longer than the width of the arm. It is a pipe piping structure.

According to a third aspect of the present invention, the hydraulic pipe comprises a standard hydraulic pipe and an optional hydraulic pipe for an optional device, and the standard hydraulic pipe and the optional hydraulic pipe are connected in parallel between the arm brackets. It is a piping structure of a hydraulic pipe.

According to a fourth aspect of the present invention, the optional hydraulic pipe extends from the upper surface of the arm to the arm side wall, and the extended end is connected to a joint for connecting an optional device provided on the arm side wall. It is a piping structure of a hydraulic pipe.

According to the first aspect of the present invention, the boom side of the hydraulic pipe is fixed to the downwardly inclined surface formed at the end of the boom, and, for example, the arm side of the hydraulic pipe is passed over the connecting pin insertion boss. When it is bent in the detour direction, the piping shape of the hydraulic pipe bridged between the boom and the arm becomes S-shaped, and the hydraulic pipe is efficiently accommodated in a limited area arm bracket with a margin be able to.

According to the second aspect of the present invention, by welding the arm bracket to the outer surface of the side wall of the rear end of the arm,
The entire upper surface of the arm can be used as a space for laying the hydraulic pipe.

According to the third aspect of the present invention, for example, a standard hydraulic pipe for a bucket cylinder and an optional hydraulic pipe for an optional device can be arranged in parallel in the laying space between the arm brackets.

According to the fourth aspect of the present invention, the hydraulic pipe is not exposed to the side walls of the arm and the boom except for the joint for connecting the option, so that the hydraulic pipe for the optional device is protected and the appearance is improved.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on one embodiment shown in the drawings.

FIG. 1 shows a front attachment of a hydraulic shovel to which a piping structure of a hydraulic pipe according to the present invention is applied. In FIG. 1, reference numeral 1 denotes a main part of the front attachment, 2 denotes a boom, and 3 denotes an arm connected to the tip of the boom 2. A bucket (not shown) is connected to the tip of the arm 3.

The long boom 2 has a box-shaped cross section, and the boom base 2a is connected to a frame front (not shown) of the upper revolving unit via a connecting pin 4. On the other hand, the top surface of the boom tip 2b is cut obliquely to form a downwardly inclined surface 2c. A pair of boom brackets 5 and 6 (only the front boom bracket 5 is shown) extend in parallel from both side walls of the boom tip 2b.

Reference numeral 7 denotes a lower bracket attached to the lower surface of the boom 2, to which a rod of a boom cylinder (not shown) is attached. Reference numeral 8 denotes an upper bracket attached to the upper surface of the boom 2, to which the head of the arm cylinder 9 is attached.

FIG. 2 shows the structure of the arm 3 connected to the boom brackets 5 and 6 via the connecting pins 10.

In the same figure, a boss portion (boss for inserting a connecting pin) 3 through which the connecting pin 10 passes is provided on the rear end 3a of the arm.
The rear plate 3c is attached so as to be connected to the boss portion 3b and to close the end surface of the arm rear end portion 3a. More specifically, the side walls 3d, 3d of the arm rear end 3a are formed at an acute angle toward the boss 3b, and the rear plate 3c is straddled over the diagonally cut side walls 3d, 3d. Welded.

Reference numerals 11 and 11 denote a pair of arm brackets, each having a mounting portion 11a for mounting the rod tip of the arm cylinder 9 and a mounting portion 11b for mounting the head of the boom cylinder 12. Further, both arm brackets 11 and 11 are fixed to the rear fixed legs 11c.
The rear fixed leg 11c is welded to the rear plate 3c and a part of the outer peripheral surface of the boss 3b, and the front fixed leg 11d is welded to the arm side wall 3d. The rear side arm bracket 11 is similarly configured.

The front fixed leg 11d has a triangular shape,
A bottom part 11e formed long along the upper side of the arm 3 is welded to the arm side wall 3d. Arm bracket 1
1, a notch 11f is formed substantially at the center, and the rear fixed leg 1 is formed.
A notch 11f 'is formed between 1c and the front fixed leg 11d, and the rear fixed legs 11c, 11c provided on the rear side of the notch 11f' have a width slightly larger than the width of the arm 3. The rear plate 3c is welded to both left and right sides.

Since the arm bracket 11 is conventionally welded to the upper surface of the arm 3, the interval between the pair of arm brackets is naturally smaller than the lateral width of the arm 3.
However, the arm brackets 11 and 11 of the present embodiment
Are extended in parallel from the arm side walls 3 d, so that the interval W thereof is equal to the lateral width of the arm 3. In other words, the space for accommodating the hydraulic hose is expanded by the increased mounting interval between the arm brackets 11, 11.

Next, a description will be given of a piping structure of a hydraulic pipe disposed on the boom 2 and the arm 3 having the above-described configuration.

As shown in FIG. 1, a metal boom side tube 13a is provided along the upper surface of the boom 2, while a metal arm side tube 13b is provided along the upper surface of the arm 3. Has been established. A hydraulic hose group 14 as a flexible hydraulic tube is connected between the base 13c of the boom-side tube 13a and the base 13d of the arm-side tube 13b.

The base 13c for connecting the boom-side tube 13a and the hydraulic hose group 14 is bent with respect to the hydraulic hose group 14 fixed to the upper surface of the boom 2 and the inclined surface 2c of the boom tip 2b. If the hydraulic hose group 14 is disposed at a position where the influence is not exerted, there is an advantage that the hydraulic hose group 14 can be smoothly handled.

FIG. 3 is an enlarged view of the piping structure of the hydraulic hose group 14. In FIG. 1A, a hydraulic hose group 14 includes a hose 14a connected to the head side of the bucket cylinder 12, a hose 14b connected to the rod side, and a hose 14 for supplying hydraulic oil to optional devices.
c and hose 14d through which return oil from optional equipment passes
It is composed of The hoses 14c and 14c
d functions as an optional hydraulic pipe.

The boom side of the hydraulic hose group 14 is fixed via a clamp 15 as a fixed portion provided on the inclined surface 2c of the boom tip 2b, while the arm side is mounted on the upper surface of the arm rear end 3a. It is fixed via a clamp 16.

The clamps 15 and 16 are used to maintain the shape of the hydraulic hose group 14 between the boss 3b and the boom tip 2b in a state where the hydraulic hose group 14 is forcibly folded in an inverted S-shape. is there.

The clamp 15 fixes the hydraulic hose group 14 disposed along the inclined surface, and moves the boom side of the hydraulic hose group 14 even if the hydraulic hose group 14 is displaced by the retracting or pushing operation of the arm 3. The shape is always U-shaped. On the other hand, the clamp 16 fixes the hydraulic hose group 14 so that the arm side of the hydraulic hose group 14 can bypass the boss 3b with a margin at the time of the maximum retracting operation of the arm 3. Thereby, the hydraulic hose group 14 is held in an inverted S-shape.

FIG. 4 is a cross-sectional view taken along the line AA of FIG. 3 and shows a fixing structure of the clamp 16. The hydraulic hose group 14 includes a clamp receiving portion 16 in which four concave grooves are formed.
a, and a plate-like cover 16b is applied from above. A through-hole is formed at the center of the cover 16b, and the hydraulic hose group 14 is fixed by passing a screw 16c through the through-hole and screwing it into a female screw 16d fixed to the upper surface of the arm 3.

In the above-described piping structure, a small space in the arm bracket 11 is used, and the hydraulic hose group 14 is
Since it is possible to provide a margin by effectively bending the arm bracket 11, it is not necessary to expand the shape of the arm bracket 11, or the arm rear end 3a and the bracket front end 2b
It is not necessary to accommodate the hydraulic hose group 14 with an increased space between the arm bracket 11 and the arm bracket 11 or the connecting portion between the arm 3 and the boom 2 can be made compact.

Also, hoses 14c for optional devices,
As shown in FIGS. 3A and 3B, the joint 14d is distributed to the left and right after passing through the arm bracket 11 and descends along the arm side walls 3d, 3d. 18. Therefore, the hydraulic hoses 14c and 14d for the optional devices do not project on the side wall of the boom 2 or the side wall of the arm 3, and
There is no danger of contact with obstacles and damage during operation.

The standard equipment hoses 14a and 14b connected to the bucket cylinder 12 are arranged inside and parallel to the optional equipment hoses 14c and 14d. Is connected to the head side of the bucket cylinder 12 via the

As described above, in this embodiment, in addition to the standard hydraulic hoses 14a and 14b, the hydraulic hoses 14c and 14d for optional devices can be housed side by side in the arm bracket 11, so that the side wall of the front attachment can be accommodated. Hydraulic hose group 14 does not appear at all, and the appearance can be improved.

[0039]

As is apparent from the above description,
According to the first aspect of the present invention, a downwardly inclined surface is formed at the end of the boom to secure a space in which the hydraulic hose can bend, and the flexible hydraulic tube is fixed on the inclined surface. Thus, the hydraulic pipe can be efficiently stored in the arm bracket in a state in which there is a margin for reliably following the operation of the arm.

According to the second aspect of the present invention, since the arm bracket extends in parallel along the side wall of the rear end of the arm, the entire width of the upper surface of the arm can be used as a space for laying the hydraulic pipe.

According to the third aspect of the present invention, since the hydraulic pipe leading to the optional connection joint is configured to pass through the arm bracket, the appearance of the pipe can be improved.

According to the present invention, the hydraulic pipe is not exposed to the side walls of the arm and the boom except for the joint for connecting the option, so that the appearance of the pipe is improved and the hydraulic pipe for the optional device is protected. be able to.

[Brief description of the drawings]

FIG. 1 is a side view showing a configuration of a piping structure of a front attachment according to the present invention.

FIG. 2 is a perspective view showing a configuration of an arm of FIG. 1;

3 (a) is an enlarged plan view showing a piping structure of the hydraulic hose of FIG. 1, and FIG. 3 (b) is an enlarged side view of the same.

FIG. 4 is a view taken in the direction of arrows AA in FIG. 3;

FIG. 5 is a perspective view showing a conventional piping structure.

FIG. 6 is a perspective view showing another conventional piping structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front attachment 2 Boom 2c Inclined surface 3 Arm 5, 6 Boom bracket 9 Arm cylinder 10 Connecting pin 11 Arm bracket 12 Boom cylinder 14 Hydraulic hose group 15 Clamp

Claims (4)

[Claims] 1. A boom of a front attachment is connected to an arm via a connecting pin, and a flexible hydraulic pipe is bridged from the boom to the arm through a pair of arm brackets provided at a rear end of the arm. In the piping structure of the hydraulic pipe, the upper surface of the boom tip portion is formed on a downwardly inclined surface, and the hydraulic tube is fixed to a fixing portion provided on the inclined surface along the inclined surface. Hydraulic pipe piping structure. 2. The arm bracket is welded to an outer surface of a side wall of the rear end of the arm so that a distance between a pair of arm brackets through which the hydraulic pipe passes has a length equal to or greater than a width of the arm. The piping structure of the described hydraulic pipe. 3. The hydraulic pipe comprises a standard hydraulic pipe and an optional hydraulic pipe for an optional device, and the standard hydraulic pipe and the optional hydraulic pipe are connected in parallel between the arm brackets. 3. The piping structure of the hydraulic pipe according to 1 or 2. 4. The optional hydraulic pipe extends from an upper surface of the arm to an arm side wall, and an extended end thereof is connected to a joint for connecting an optional device provided on the arm side wall. Hydraulic pipe piping structure.