JP2000248583A - Swivel hydraulic drive - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To shorten the oil supply pipe by changing the mounting orientation of a direction switching valve (operating valve) on a revolving structure of a revolving hydraulic drive working machine, and make the oil supply pipe impossible. Instead, connect it to the boom-side actuator, swing motor, etc., and install piping for good maintenance. SOLUTION: In a small-swing hydraulic excavator (swing hydraulic operating machine) in which a hydraulic pump 10, a hydraulic oil tank 11, a fuel tank 12, and an operating valve 13 are arranged on an upper rotating body 3, the operating valve 13 is provided. The pipe connection surface 13 ′ is installed obliquely with the pipe connecting surface 13 ′ obliquely oriented toward the center of rotation at the front or rear side of the center of the boom 5. Piping is performed along the upper surface of the boom 5 from behind.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulically-operated working machine such as a hydraulic shovel, and more particularly to a swing-type hydraulically-driven working machine having a configuration in which oil supply piping to an actuator in a small-swing-type working machine can be rationally performed. It is about.

[0002]

2. Description of the Related Art In general, in a hydraulically driven working machine, for example, a hydraulic shovel, an upper revolving body that can freely pivot is provided on a lower traveling body. A working machine consisting of working attachments such as an arm and a bucket is provided, a driver's cab is installed on one side, and an engine as a drive source such as a hydraulic motor is equipped at the rear of the upper revolving unit. ing.

In this type of hydraulically driven working machine, various hydraulic cylinders such as a boom cylinder, a hydraulic motor for turning, and the like are operated on the upper revolving unit in accordance with an operation by an operating lever provided in an operator's cab. Operating valve (directional switching valve), hydraulic oil tank, and fuel tank. The upper revolving superstructure on which such various devices are mounted is a small revolving type working machine, and in order to improve workability in a narrow portion, it is necessary to remarkably reduce the revolving radius, and therefore, It is installed with the onboard equipment moved forward.

[0006] Under such circumstances, the equipment mounted on the upper revolving superstructure generally has a hydraulic pump at a position opposite to the cab 104 from the rear to the front on the upper revolving superstructure 100 as shown in FIG. 110 and its driving engine 11
1, a hydraulic oil / fuel oil tank 112, and an oil supply direction switching valve (operation valve) 113 to the actuator are arranged in this order. Such a prior example is disclosed in Japanese Utility Model Publication No. Hei 7-26438. Alternatively, JP-A-8-24650
As disclosed in Japanese Patent Laid-Open No. 0, there is known an arrangement in which a directional switching valve and an oil tank are arranged right beside a cab at a front position of an engine.

However, even though the equipment can be arranged in a narrow space, the brackets are particularly required for piping from the directional control valve to the actuator or swivel joint to be attached to the work equipment boom. However, there is a problem that the piping must be made through such a route, and the route must be complicated.

The direction switching valve 113 disposed on the upper revolving unit 100 is mounted so that its direction is parallel to the axis of the work machine boom, so that a refueling hose piped from each port of the valve body. The pipes are arranged in such a manner that they rise close to the side of the boom and then follow the upper surface of the boom. For this purpose, just after the base hose 102 of the boom 101 is largely bent outward including that the oil supply hose 103 needs a margin capable of coping with the ups and downs of the boom 101, as illustrated in FIG. The mounting shape is such that it follows the boom 101, and since the fuel supply hose 103 exhibits the curved portion A in a state of bulging outward, the fuel supply hose is used when the worker rises on the revolving body to perform a fuel supply operation or the like. Danger of accidentally catching and breaking the swollen curved portion A of 103, or causing an accident that a foreign object protruding from the side contacts a curved portion A of the refueling hose 103 and breaks at a narrow work site or the like. There is.

[0006] Complicating the oil supply pipe is not preferable because the pipe length becomes longer and the number of bent portions increases the pressure loss in the pipe. In addition, there is a problem in that the presence of a bulging portion outside the hose makes the appearance unsightly.

Further, when the port of the directional control valve is connected to the boom side, there is not much problem in assembling the machine at the beginning, but during maintenance, the user can connect the valve body of the directional control valve to the boom. Since the space between them is small, it becomes difficult to attach and detach piping at the valve connection port,
There is a problem that workability is hindered.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and it is possible to shorten the oil supply pipe by changing the mounting posture of a directional control valve (operating valve), and to make the oil supply pipe impossible. It is another object of the present invention to provide a swing type hydraulically driven working machine configured to be connected to an actuator attached to a boom, a swing motor, or the like, and to perform piping so that maintenance is good.

[0009]

Means for Solving the Problems and Functions / Effects In order to achieve the above-mentioned object, a swing type hydraulic drive working machine according to the present invention comprises a hydraulic pump, an oil tank, and an operation valve arranged on an upper swing body. Rotating hydraulic drive working machine
The operation valve may be installed obliquely at a front or rear position on a side of a turning center.

According to the present invention, the piping from the piping connection of the operating valve to each actuator can be piped along the upper revolving structure without directly rising, and the working machine boom side Since the pipes to the pipes can be formed along the boom without being bent outward greatly, the length of each pipe can be shortened and the occurrence of pressure loss can be minimized. In addition, since the pipe (oil supply hose) to the boom side is not curved and swelled outward but is gathered in a small curve, the pipe is not broken by an operator. Of course, even if a foreign substance protrudes from the outside, there is an effect that the danger of damaging the oil supply hose can be eliminated.

It is preferable that the operating valve is disposed with its pipe connection surface facing the center of the turning center. By doing so, a wide space can be obtained at the front without the piping connection surface of the operating valve being blocked by a boom or the like.Therefore, piping with a straight pipe without connecting to the connection port of the operating valve with a curved pipe such as an elbow It will be possible to connect the piping to the swivel joint and the actuator attached to the work equipment boom with the shortest distance. Also, since the oil supply hose can be attached to the actuator at the tip of the working machine boom from the base of the boom along the upper surface, the phenomenon of swelling outward by turning the boom to the rear can be avoided, and contact due to contact can be avoided. It is possible to prevent the occurrence of a failure beforehand, and to improve the appearance. Of course, the workability during inspection and maintenance can be improved, and the maintenance work can be made more reliable.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a rotary hydraulically driven working machine according to a preferred embodiment of the present invention.

A small turning hydraulic excavator will be described as an embodiment of a turning hydraulically driven working machine according to the present invention. FIG. 1 is an external perspective view of the small turning hydraulic excavator according to the present embodiment, FIG. 2 is a partially cutaway plan view of the small turning hydraulic excavator according to the present embodiment, and FIG. FIG. 4 is a perspective view, and FIG. 4 is an XX perspective view of FIG.

In the hydraulic excavator 1, an upper revolving unit 3 is provided on a lower traveling unit 2 so as to be pivotable.
A cab 4 is mounted on the upper side of the cab 4 while being biased to one side, and a boom 5 of a working machine is attached to a front portion of the cab 4 so as to be able to move up and down by a boom operation cylinder 5a. An arm 6 is attached to the end of the boom 5 by an arm operating cylinder 6a, and a bucket 7 is attached to the end of the arm 6 so as to be operated by a bucket operating cylinder 7a attached to the arm 6. Reference numeral 8 in the figure denotes a dosing blade.

A hydraulic pump 10 driven by an engine 9 mounted at the rear is provided on the upper revolving unit 3 on the side opposite to the cab 4, and a hydraulic oil tank 11 is provided at a front position of the hydraulic pump 10. And a fuel tank 12 for driving the engine, and a unit of an operation valve 13 is installed in front of the hydraulic oil tank 11 and the fuel tank 12. A counterweight 14 is provided at the rear end of the upper revolving unit 3.

The operation valve 13 provided by such an arrangement includes an actuator (an arm operation cylinder 6a on the boom 5 and an arm 6 located at the tip thereof).
The valve units respectively connected to a bucket operating cylinder 7a, a swing motor 15 disposed on the revolving unit, and a swivel joint 16 to a traveling drive motor (not shown) of the lower traveling unit 2 are stacked. And the pipe connection surface 13 'is attached so as to be substantially directed to the center of rotation.

The piping from the operating valve 13 to each actuator is performed, for example, in a valve unit as shown in FIG. 3 by operating the operating valve unit 13a of the arm operating cylinder 6a and the bucket operating cylinder 7a in order from the top. Valve unit 13b, operating valve unit 13c of swing motor 15, operating valve unit 1 for swivel joint 16
3d, each of these valve units 13a, 13b,
The lubrication hoses 17a and 17d are respectively connected to the ports 13c and 13d by well-known straight pipe joint fittings (not shown).
7a, 17b, 17b, 17c, 17c, 17d, 17
Connect d. And the upper two-stage operation valve unit 13
a, 17a, 17a, 17a
As shown in FIGS. 2 and 4, b and 17b are directed toward the center of rotation as they are, and are then changed in direction from the base of the boom 5 along the upper surface of the boom 5, and are not shown. The boom 5 is connected to a pipe at an appropriate position on the upper surface. In addition, these refueling hoses 17a, 1
Each of the curved portions a for changing the direction of the boom 5 near the base of the boom 5 is curved behind the boom 5 so as to be able to cope with the ups and downs of the boom 5.

The lower two-stage operation valve unit 13c, 1
Refueling hoses 17c, 17c, 17d, 17 from 3d
d is extended toward the center of rotation, and is directly connected to the connection port of the rotation motor 15 or the swivel joint 16 by a known joint fitting. These refueling hoses 17c, 17c, 17d, and 17d can be piped almost linearly, and are connected to each other by a structure formed on the upper surface of the upper rotating body 3 within a reasonable range. Therefore, a large curved portion is not formed.

Further, as described above, since the pipe connection surface 13 'of the operation valve 13 is installed toward the center of rotation or in the vicinity thereof, the front space of the pipe connection can be made wider than before. Become. Therefore, if the procedure for connecting the oil supply hose for each operation valve unit is determined and performed,
You can easily connect. Of course, even when the oil supply hose is attached / detached for maintenance work or the like, the connection portion is not subjected to excessive resistance due to the bending of the oil supply hose, so that the workability is not impaired. In addition, since the oil supply hose can be distributed from the operation valve 13 to each actuator in this manner, the oil supply hoses 17a, 17a, 17b, and 17b particularly to the actuators provided with the boom are bent at the rear of the boom 5 in the direction. Since the conversion can be performed, when the worker climbs up on the revolving body to perform work while refueling the fuel tank 12 or inspecting the hydraulic oil tank 11, the curved portion a of the refueling hose is used.
There is no possibility of accidental hooking of the refueling hose and damage accident.

Each of the refueling hoses 17a, 17b, 17
As for c and 17d, as described above, the piping from the operation valve 13 can be shortened as compared with the related art, and since there is no complicated piping path, the effect of reducing the pressure loss of the hydraulic oil can be obtained. Furthermore, since the appearance is gathered behind the boom 5, the appearance is improved, which is useful for improving the design appearance.

FIG. 5 is a plan view of a main part of a small-swing hydraulic excavator according to another embodiment of the present invention. This figure shows another example in which the arrangement condition of the operation valve 13 of the actuator arranged on the upper swing body 3 in the hydraulic shovel is changed in the same manner as described above. Note that the same components as those in the above-described embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

In this embodiment, the operation valve 13 mounted on the upper revolving unit 3 on the side opposite to the side on which the cab 4 is mounted is disposed close to the hydraulic pump 10 and its piping connection surface 1
3 'is oriented toward the center of rotation. Therefore, the hydraulic oil tank 11 and the fuel tank 12 are installed at a position on the front side from the position of the operation valve 13.

An oil supply pipe (oil supply) from the operation valve 13 on the upper revolving unit 3 configured as described above to each actuator (the arm operation cylinder 6a, the bucket operation cylinder 7a of the work machine, the rotation motor 15, and the swivel joint 16). Hose) 17a, 17a, 17b, 17b, 17c,
As shown in FIG. 5, 17c, 17d, and 17d have the pipe connection surface 13 'of the operation valve 13 arranged toward the center of rotation, so that the front space thereof can be widened. As in the case of the example, the pipes to the swing motor 15 and the swivel joint 16 can be connected linearly. Also, the pipe to the actuator attached to the boom has a margin from the pipe connection part of the operation valve 13 to allow for the up-and-down movement of the boom 5, and a gentle curved portion is formed at the rear of the base of the boom 5 to be directly along the boom upper surface. After that, it is connected to a pipe pipe (not shown) at an appropriate position on the upper surface of the boom 5.

By doing so, the same effect as in the above embodiment can be obtained in this embodiment.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a small-swing hydraulic excavator according to the present embodiment.

FIG. 2 is a partially cutaway plan view of the small turning hydraulic excavator according to the embodiment.

FIG. 3 is a ZZ view in FIG. 2;

FIG. 4 is a XX view of FIG. 2;

FIG. 5 is a plan view of a main part of a small-swing hydraulic excavator according to another embodiment.

FIG. 6 is a plan view showing an arrangement of devices installed on an upper revolving structure in a conventional small-slewing hydraulic excavator.

FIG. 7 is a front view of a state of piping of an oil supply hose to a boom side in a conventional small turning hydraulic excavator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hydraulic excavator 3 Upper revolving unit 4 Cab 5 Boom 6 Arm 6a Arm operating cylinder 7 Bucket 7a Bucket operating cylinder 10 Hydraulic pump 11 Hydraulic oil tank 12 Fuel tank 13 Operating valve 13 'Piping connection surface of operating valve 15 Swing motor 16 Swivel joint 17a, 17b, 17c, 17d Refueling hose

Claims (2)

[Claims] 1. A hydraulic pump, an oil tank,
A turning hydraulically driven working machine in which an operating valve is disposed, wherein the operating valve is installed obliquely at a front or rear side of a turning center. 2. The rotary hydraulically driven working machine according to claim 1, wherein the operating valve is disposed with its piping connection surface directed toward the vicinity of the center of rotation.