JPH08302726A - Hydraulic piping structure of telescopic arm - Google Patents

Abstract

PURPOSE: To prevent the trouble of sagging of a hydraulic hose by installing the hydraulic hose near the connecting section of the front end section of a boom and the base bracket section of a lower arm, mounting a hydraulic pipe while being penetrated to the side face plate of the lower arm and forming a hydraulic piping near the base end section of a cylinder tube through a port. CONSTITUTION: Hydraulic hoses 15L, 15R having length capable of corresponding to hydraulic hoses 18L, 18R, L-shaped pipes 16L, 16R and the stroke of a telescopic cylinder 19 are set up near the connecting section of the front end section of a boom and the base bracket section 6 of a lower arm 5. Joint members 14L, 14R are fitted at the rear section of a bracket 8 for mounting the cylinder in an upper arm 7. Supply and exhaust ducts for a bucket cylinder 10 are piped through pipings 13L, 13R passing through the lower side of a bucket-cylinder mounting section 28. According to such formation, the unnecessary sag of the hoses installed on their midways of the pipings is prevented, thus improving the maintenance of the hydraulic pipings.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic piping structure of a telescopic arm, which is mainly installed in construction machines such as hydraulic excavators and work attachments of work vehicles.

[0002]

2. Description of the Related Art FIG. 8 is a partially cutaway side view of a telescopic arm disclosed in Japanese Utility Model Publication No. 3-54197. In one embodiment of the prior art telescopic arm shown in FIG. 8,
The hydraulic pipe 2 communicating with the bucket cylinder 1 is passed through the lateral outside of the telescopic arm, and the hydraulic pipe 4 communicating with the hydraulic cylinder 3 is piped with the inside of the telescopic arm facing rearward.

[0003]

Although various prior art telescopic arms have been taken into consideration, their hydraulic piping has not been fully taken into consideration. For example, the positioning of the hydraulic pipes that have been routed through each part of the telescopic arm has not been reliably performed, so the hydraulic pipes may come into contact with the parts of the telescopic arm, or be placed in the middle of the hydraulic pipes. The slack of the hydraulic hose sometimes caused a problem. It is an object of the present invention to provide a hydraulic piping structure for a telescopic arm that can solve the above problems.

[0004]

According to the present invention, a base bracket portion of a lower arm is connected to a boom tip portion of a construction machine, and an upper arm is provided slidably in the longitudinal direction with respect to the lower arm. A telescopic cylinder is placed between the arms, and a bucket cylinder is attached via a push rod between a cylinder mounting bracket that is erected on the upper surface of the upper arm and a work tool that is attached to the tip of the upper arm. In the telescopic arm that connects the hydraulic source arranged on the machine body with the telescopic cylinder and the bucket cylinder by hydraulic piping, the cylinder mounting bracket upright on the upper surface of the upper arm is set to the rear. Between the lower side of the bucket cylinder mounting part connected to the cylinder mounting bracket and the upper arm upper surface side, which are extended. It passed through a hydraulic pipe for socket cylinder supply and discharge conduit, yielding pipe rearwardly through the interior of the freshly plate. Then, the pipe joint member is fixedly attached to the rear portion of the cylinder mounting bracket, the hydraulic pipes of the supply and discharge pipe lines of the bucket cylinder are connected to the pipe joint member, and hydraulic pressure is applied to both left and right side surfaces of the lower arm. The L-shaped pipe leading to the source is fixed and attached, and between each L-shaped pipe and each port of the pipe joint member,
A hydraulic hose with a length compatible with the stroke of the telescopic cylinder was connected.

In the present invention, the cylinder tube base end portion of the telescopic cylinder is connected to the lower arm and the rod tip end portion is connected to the upper arm to connect the bottom side oil chamber and the rod side oil chamber of the telescopic cylinder, respectively. The port was provided on the lower side near the base end of the cylinder tube, and the opening direction of the pipe connection port was oriented in the left-right direction. Then, hydraulic pipes are provided respectively penetrating the left and right side plate portions of the lower arm at a position near the base end portion of the cylinder tube, and the pipe connecting port of the telescopic cylinder and the hydraulic source are provided through the hydraulic pipes. I made it possible to communicate.

[0006]

In the hydraulic piping structure of the telescopic arm according to the present invention, piping is provided from the hydraulic power source of the machine body along the outer peripheral portion of the boom, and is arranged in the vicinity of the connecting portion between the boom tip portion and the base bracket portion of the lower arm. Hydraulic hose, L-shaped pipe, hydraulic hose having a length that can correspond to the stroke of a telescopic cylinder, piping joint member arranged at the rear part of the upper arm cylinder mounting bracket, hydraulic pressure that passes below the bucket cylinder mounting part Through the piping, the hydraulic piping of the bucket cylinder supply / discharge pipeline can be reliably constructed.

Further, according to the present invention, a hydraulic hose and a lower arm, which are piped from the hydraulic power source of the machine body along the outer peripheral portion of the boom and are arranged near the connecting portion between the boom tip portion and the base bracket portion of the lower arm, Through the hydraulic pipes that penetrate through the left and right side plates and the pipe connection ports that are provided in the left and right directions near the base end of the cylinder tube, securely connect the hydraulic pipes of the supply and discharge pipeline for the telescopic cylinder. Can be installed.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a side view showing a contracted state of a telescopic arm having a hydraulic piping structure of the present invention. In the figure, 5 is a lower arm of the telescopic arm, 6 is a base bracket portion of the lower arm 5 connected to the tip of a boom (not shown) of the hydraulic excavator, 7 is an upper arm, and 8 is an upper surface of the upper arm 7. An upright cylinder mounting bracket, 9 is a push rod connected to a work tool (for example, a bucket (not shown) attached to the tip of the upper arm 7, 10 is a bucket cylinder, 11 is an oil chamber on the rod side of the bucket cylinder 10. Piping connection port that communicates, 12 is a piping connection port that communicates with the bottom side oil chamber, 13L, 13
R is a hydraulic pipe, 14L and 14R are left and right pipe joint members (the pipe joint member 14R is on the opposite side of 14L and therefore not visible in the figure), 15L and 15R are left and right hydraulic hoses, and 16L and 16R are left and right L pipes. Shaped pipes, 17 clamps for L-shaped pipes 16L and 16R, 18L and 18R hydraulic left and right hydraulic hoses, 19 telescopic cylinders, 2
0L and 20R are left and right hydraulic hoses. FIG. 2 shows FIG.
It is a principal part top view seen from A of FIG. In the figure, 21L,
21R is a pair of left and right vertical plates forming the cylinder mounting bracket 8. FIG. 3 is a plan view of an essential part seen from BB of FIG. FIG. 4 is a side view of the telescopic cylinder 19 in FIG. In the figure, 22 is a cylinder tube base end portion, 23 is a rod tip end portion, 24 is a pipe connection port leading to a bottom side oil chamber (not shown) of the telescopic cylinder 19, and 25 is a pipe connection leading to the rod side oil chamber. It is a port for. FIG. 5 is a plan view seen from C in FIG. FIG. 6 is a plan view of an essential part seen from DD of FIG. In the figure, 26L and 26R are left and right side plates of the lower arm 5, and 27L and 27R are left and right hydraulic pipes. FIG. 7 is a side view showing an extended state of the telescopic arm in FIG.

Next, the hydraulic piping structure of the present invention is shown in FIGS.
I will describe. According to the present invention, the vertical plates 21L and 2L of the cylinder mounting bracket 8 standing on the upper surface of the upper arm 7 are provided.
1R is extended rearward and is provided between the lower side of the mounting portion of the bucket cylinder 10 (referred to as the mounting portion of reference numeral 28 shown in FIG. 1) connected to the cylinder mounting bracket 8 and the upper arm 7 upper surface side. The hydraulic pipes 13L and 13R in the supply / discharge pipe line for the cylinder 10 were passed, and the pipes were passed backward through the insides of the vertical plates 21L and 21R. The pipe joint member 1 is provided at the rear of the cylinder mounting bracket 8.
4L and 14R are fixed and attached, and the pipe joint member 1
4L and 14R are connected to the hydraulic pipes 13L and 13R, respectively, and the left and right side portions of the lower arm 5 (the side plates of the side portions are reference numerals 26L and 26R shown in FIG. The L-shaped pipes 16L and 16R, which are arranged but not shown, are connected to the clamp metal fitting 1 respectively.
7 fixed and attached, each of which is an L-shaped pipe 16
Between the L and 16R and the respective ports (not shown) of the piping joint members 14L and 14R, a hydraulic hose 15L having a length that can correspond to the stroke S of the telescopic cylinder 19 (shown in FIG. 7), 15R was connected.

Further, in the present invention, the cylinder tube base end portion 22 (shown in FIGS. 4 to 6) of the telescopic cylinder 19 is connected to the lower arm 5 and the rod tip end portion 23 is connected to the upper arm 7, and the telescopic cylinder 19 is connected. Of the bottom side oil chamber and the rod side oil chamber, respectively, are provided with pipe connection ports 24 and 25 on the lower side in the vicinity of the base end portion 22 of the cylinder tube, and the opening direction of the pipe connection ports 24 and 25 is in the left-right direction. I aimed it. The lower arm 5 near the base end 22 of the cylinder tube
Through the left and right side plates 26L, 26R (shown in FIG. 6) of the telescopic cylinder 19 through the hydraulic pipes 27L, 27R, respectively.
Made to communicate with the hydraulic power source.

Next, the operation of the hydraulic piping structure of the present invention will be described. In the present invention, piping is provided along the outer peripheral surface of the boom (not shown) from the hydraulic power source of the machine body, and near the connecting portion between the boom tip portion and the base bracket portion 6 (shown in FIG. 1) of the lower arm 5. The hydraulic hoses 18L, 18R arranged,
L-shaped pipes 16L, 16R, telescopic cylinder 1
Hydraulic hose 1 having a length that can accommodate 9 strokes S
5L, 15R, piping joint members 14L, 14R arranged at the rear of the cylinder mounting bracket 8 of the upper arm 7,
Hydraulic pipe 1 passing under the bucket cylinder mounting portion 28
Through 3L and 13R, it is possible to surely construct the hydraulic pipe of the supply / discharge pipe line for the bucket cylinder 10.

Further, according to the present invention, a hydraulic hose 20L, which is piped from the hydraulic power source of the machine body along the outer peripheral surface of the boom and is disposed near the connecting portion between the boom tip and the base bracket portion 6 of the lower arm 5, 20R, left and right side plates 26 of the lower arm 5
L, 26R (shown in FIG. 6) penetrating the hydraulic pipes 27L, 27R, and pipe connection ports 25, 2 provided in the left-right direction near the cylinder tube base end 22.
4, the hydraulic pipe of the supply / discharge pipe line for the telescopic cylinder 19 can be surely installed.

[0013]

According to the hydraulic piping structure of the telescopic arm of the present invention, piping is provided from the hydraulic power source of the machine body along the outer peripheral surface of the boom, and is arranged in the vicinity of the connecting portion between the boom tip portion and the base bracket portion of the lower arm. Hydraulic hose, L-shaped pipe, hydraulic hose with a length that can correspond to the stroke of the telescopic cylinder, pipe joint member arranged at the rear part of the cylinder mounting bracket of the upper arm, and the lower side of the bucket cylinder mounting part. Through the hydraulic pipe passing therethrough, the hydraulic pipe of the supply / discharge pipe line for the bucket cylinder can be reliably constructed. Further, according to the present invention, a hydraulic hose, which is piped from the hydraulic power source of the machine body along the outer peripheral portion of the boom, is disposed near the connecting portion between the boom tip portion and the base bracket portion of the lower arm, and the left and right side plates of the lower arm. Securely install the hydraulic piping of the feed and discharge pipeline for the telescopic cylinder through the hydraulic pipe that is installed through the pipe and the piping connection port that is provided in the left and right direction near the base end of the cylinder tube. Can be done. As described above, in the present invention, the positioning of the hydraulic pipe is performed reliably and rationally, so that the hydraulic pipe comes into contact with the portion of the telescopic arm, and the hydraulic pressure provided in the middle of the hydraulic pipe. The hose can be prevented from causing unnecessary slack on the upper side or the lower side, and the maintainability of the hydraulic pipe can be improved.

[Brief description of drawings]

FIG. 1 is a side view showing a telescopic arm provided with a hydraulic piping structure of the present invention.

FIG. 2 is a plan view of an essential part seen from A in FIG.

FIG. 3 is a plan view of a main part seen from BB of FIG.

4 is a side view of the telescopic cylinder in FIG. 1. FIG.

5 is a plan view seen from C in FIG. 4. FIG.

FIG. 6 is a plan view of a main part viewed from DD of FIG.

FIG. 7 is a side view showing an extended state of the telescopic arm in FIG.

FIG. 8 is a partially cutaway side view of a telescopic arm according to an embodiment of the prior art.

[Explanation of symbols]

1,10 Bucket cylinder 2,4,13L, 13R Hydraulic piping 5 Lower arm 6 Base bracket part 7 Upper arm 8 Cylinder mounting bracket 11,12,24,25 Piping connection port 14L, 14R Piping joint member 15L, 15R , 18L, 18R, 20L, 20R Hydraulic hose 16L, 16R L-shaped pipe 19 Telescopic cylinder 21L, 21R Vertical plate 22 Cylinder tube base end part 26L, 26R Side plate 27L, 27R Hydraulic pipe 28 Bucket cylinder mounting part

Claims (4)

[Claims] 1. A base bracket portion of a lower arm is connected to a boom tip portion of a construction machine, an upper arm is slidably provided in the longitudinal direction with respect to the lower arm, and a telescopic cylinder is provided between the both arms. In addition, the bucket cylinder is mounted via the push rod between the cylinder mounting bracket that is erected on the upper surface of the upper arm and the work tool that is mounted on the tip of the upper arm. In the telescopic arm in which the power source is communicated with the telescopic cylinder and the bucket cylinder by hydraulic piping, the vertical plate of the cylinder mounting bracket standing on the upper surface of the upper arm is extended rearward so that the cylinder mounting Between the lower side of the bucket cylinder mounting part connected to the bracket and the upper arm upper surface side, A hydraulic piping structure for a telescopic arm, characterized in that the hydraulic piping is passed through and the piping is passed backward through the inside of the vertical plate. 2. The hydraulic piping structure for a telescopic arm according to claim 1, wherein a pipe joint member is fixedly attached to the rear portion of the cylinder mounting bracket, and each of the bucket cylinders is attached to the pipe joint member. Connect the hydraulic pipes of the supply and discharge pipe lines, and fix the L-shaped pipes leading to the hydraulic source to the left and right side surfaces of the lower arm by fixing them.
A hydraulic piping structure for a telescopic arm, characterized in that a hydraulic hose having a length corresponding to the stroke of the telescopic cylinder is connected between each L-shaped pipe and each port of the piping joint member. 3. A base bracket portion of a lower arm is connected to a boom tip portion of a construction machine, an upper arm is slidably provided in the longitudinal direction of the lower arm, and a telescopic cylinder is provided between the both arms. In addition, the bucket cylinder is mounted via the push rod between the cylinder mounting bracket that is erected on the upper surface of the upper arm and the work tool that is mounted on the tip of the upper arm. In the telescopic arm in which the power source is connected to the telescopic cylinder and the bucket cylinder by hydraulic piping, the cylinder tube base end of the telescopic cylinder is connected to the lower arm and the rod tip end is connected to the upper arm. On the bottom side oil chamber and the rod side oil chamber respectively A hydraulic piping structure for a telescopic arm, characterized in that it is provided on the lower side near the base end portion of the tube, and the opening direction of the piping connection port is directed in the left-right direction. 4. A hydraulic piping structure for a telescopic arm according to claim 3, wherein hydraulic pipes are provided respectively through left and right side plate portions of the lower arm at a position near the base end of the cylinder tube. A hydraulic piping structure for a telescopic arm, characterized in that the piping connection port of the telescopic cylinder and the hydraulic source are communicated with each other via the hydraulic pipe.