JPH08246500A - Hydraulic work machine - Google Patents

Abstract

PURPOSE: To reduce such troubles that the heat and operational noise of a directional control valve unit are conveyed to an operator cab, to shorten piping length, to reduce production cost, and to prevent hydraulic pressure loss, by properly locating the operator cab, tanks, the directional control valve unit and a piping clearance part. CONSTITUTION: An operator cab 3 is mounted on one side part of the front part of a turntable 1 for a hydraulic power operation machine, and an internal- combustion engine 13 is-mounted on the rear part thereof. A hydraulic oil tank 15 and a fuel tank 16 are arranged and mounted to the outside of the other side part thereof. A piping clearance for accomodating a directional control valve unit 14 and pipe lines 26 to be extended to the machine is provided being directed to the front and rear direction from on the side of the tanks 15, 16 in that order, at the vicinity of a swing shaft of the turntable 1, and between the tanks 15, 16 and the operator cab 3. In this way, the heat and operational noise of the directional control valve unit 14 are reduced. Furthermore, piping work and maintaining work are made easy by concentrated piping.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic working machine such as a hydraulic excavator.

[0002]

2. Description of the Related Art For example, a hydraulic excavator is provided with a revolving structure provided on a traveling part so as to be freely rotatable, and a driver's cab on which a worker rides is provided on one side of a front part of the revolving structure. It is generally known that the revolving structure is equipped with an internal combustion engine as a drive source such as a hydraulic motor at the rear part thereof.

In this type of hydraulic working machine, a pipe for operating various hydraulic cylinders such as a boom cylinder and a hydraulic motor for swinging in the revolving structure in accordance with the operation of an operating lever provided in the operator's cab. A directional control valve, a tank for hydraulic oil, and a fuel tank for an internal combustion engine are mounted. And, in particular, the directional control valve and its piping have conventionally been mounted in the lower part of the operator's cab equipped with the operating lever.

However, since the directional control valve generates heat and operation noise, if it is mounted in the lower part of the operator's cab, the heat and operation sound of the directional control valve are directly transmitted to the operator's cab. It was annoying to the person. Further, the direction switching valve has a plurality of pipes connected to the various hydraulic cylinders, the turning hydraulic motor, etc., and the cab is removed in order to maintain the direction switching valve and the pipes. The troublesome work of was required.

Therefore, in order to reduce heat and operation noise directly transmitted to the operator from the lower part of the operator's cab, and to facilitate maintenance of the directional selector valve and its piping, the directional selector valve is installed in the operator's cab. It is conceivable to place it on the side.

However, if the directional control valve and its piping are inadvertently provided on the side of the operator's cab, it is necessary to extend the piping distance extending from the directional control valve, which not only increases the cost but also the loss of hydraulic pressure. May increase. Further, if the directional control valve is provided at a position where it is likely to receive an impact from the outside, it may be damaged.

[0007]

DISCLOSURE OF THE INVENTION The present invention eliminates such inconveniences, shortens the length of piping of the directional control valve to reduce costs and prevent hydraulic pressure loss, and also prevents external impact. A hydraulic working machine that can protect the directional control valve against heat, improves the working environment by reducing the heat and operating noise of the directional control valve transmitted to the operator's cab, and has excellent maintainability The purpose is to do.

[0008]

In order to achieve the above object, the present invention has a directional control valve and a hydraulic oil tank which have a driver's cab on one side of a front part and a revolving structure equipped with an internal combustion engine on the rear part. In a hydraulic working machine equipped with a fuel tank for an internal combustion engine, the tanks are arranged in front and back at a position on the outer side of the other side of the front part of the revolving structure, and the revolving structure of the revolving structure is mounted. The directional control valve is mounted in the front-rear direction between the tanks and the operator's cab at a position near the turning axis.

Further, a pipe gap for accommodating a pipe extending from the directional switching valve to the hydraulic equipment mounted on the hydraulic working machine is provided between the cab and the directional switching valve. To do.

At this time, it is preferable that the directional control valve is arranged around the piping gap and the hydraulic equipment is arranged around the piping gap.

Further, the directional control valve is provided at a position close to a swivel joint arranged near the revolving axis of the revolving structure, and a hydraulic device mounted on the hydraulic working machine serves as the directional control valve. It is preferable that they are provided close to each other.

The hydraulic equipment includes at least a hydraulic motor for turning the revolving structure and a hydraulic pump. Further, the piping space is provided in a straight line in the front-rear direction of the revolving structure, and the piping is the space for the piping. It is linearly extended toward a boom including a plurality of hydraulic cylinders provided in front of the.

[0013]

According to the present invention, since the directional control valve is mounted at a lateral position of the operator's cab, heat and operation noise of the directional control valve are directly transmitted to the operator from the lower part of the operator's cab. The transmission is reduced, and the maintenance work of the directional control valve and its piping can be easily performed without removing the cab. Further, since the directional control valve is mounted between the operator's cab and the hydraulic oil tank and the fuel tank for the internal combustion engine, it is possible to avoid the impact from the outside by the hydraulic oil tank and the fuel tank for the internal combustion engine. In addition, since the direction switching valve is provided at a position near the swivel axis of the revolving structure, the pipes extending from the direction switching valve can be concentrated at the position near the swivel axis.

Further, since the direction switching valve is provided in the front-rear direction, a relatively large space can be secured between the direction switching valve and the driver's cab, whereby the driver's cab and the direction switching valve can be secured. A space for piping can be provided between them. By providing the piping space, the piping is extended from the direction switching valve to the hydraulic equipment such as the turning hydraulic motor and the hydraulic pump through the space, and the piping is concentrated to facilitate the piping work and maintenance work. To do.

At this time, a directional control valve is arranged around the pipe gap and a hydraulic device is arranged around the pipe gap to shorten the length of the pipe.

Further, since the directional control valve is arranged near the swivel axis of the swivel body, it is close to the swivel joint. By providing it in a position close to the switching valve, the distance from the directional switching valve to each hydraulic device is made small, and the length of the pipe is shortened.

Further, since a boom having a plurality of hydraulic cylinders is provided in front of the piping space provided in a straight line in the front-rear direction of the revolving structure, the piping is provided with the boom through the piping space. The pipe is linearly extended from the direction switching valve toward the boom, and the pipes are well collected and concentrated in the pipe gap to facilitate the pipe work and maintenance work.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of the present invention will be described with reference to FIGS. 1 is a side view of the hydraulic working machine according to the present embodiment, FIG. 2 is a schematic plan view showing a layout configuration of various devices mounted on a revolving structure of the working machine of FIG. 1, and FIG. 3 is a plan view of the working machine of FIG. FIG. 4 is a side view of a hydraulic oil tank mounted on a revolving structure, and FIG. 4 is a schematic plan view showing a layout configuration of various devices mounted on a revolving structure of a working machine according to another embodiment.

Referring to FIG. 1, a hydraulic working machine according to this embodiment is, for example, a hydraulic excavator, and 1 is a revolving structure provided on a traveling unit 2 so as to be rotatable. This revolving superstructure 1 is equipped with a driver's cab 3 on the left side of its front part, and
A housing 4 housing various devices to be described later is provided so as to surround the lower right side and the rear.

Further, a boom 5, an arm 6 and a bucket 7 are sequentially extended from the front part of the revolving structure 1, and a boom cylinder 8, an arm cylinder 9 and a bucket cylinder 1 are respectively provided.
It can be swung up and down by 0. In this case, the boom 5 is pivotally supported by the support shaft 11 so as to be swingable left and right with respect to the revolving structure 1 with a support shaft 11 provided at a front portion of the revolving structure 1 as a fulcrum. In FIG. 1, 12 is a dozer.

Referring to FIG. 2, an internal combustion engine 13, a directional control valve 14, a hydraulic oil tank 15, a fuel tank 16 and the like are mounted in the housing 4 of the revolving structure 1.

The internal combustion engine 13 is provided in the rear part of the revolving superstructure 1 in the left and right direction behind the operator's cab 3, a cooling fan 17 and a radiator 18 are arranged on the right side thereof, and the internal combustion engine 13 is arranged on the left side thereof. A hydraulic pump 19 driven by 13 is attached.

The fuel tank 16 and the hydraulic oil tank 15 are
The revolving unit 1 is mounted in the housing 4 so as to be arranged in the front-rear direction at a position on the right side of the front portion of the revolving unit 1 and outward.

The direction switching valve 14 is mounted in the housing 4 in the front-rear direction at a position between the operator's cab 3, the fuel tank 16 and the hydraulic oil tank 15 and in the vicinity of the swivel axis of the swivel body 1. There is. Further, the direction switching valve 14 is provided in the front-rear direction, so that a relatively large space is secured between the direction switching valve 14 and the operator's cab 3. Therefore, a pipe gap 27 for accommodating a pipe 26 described later is provided between the direction switching valve 14 and the operator's cab 3. Gap 27 for the pipe
The boom 5 is located in front of.

Below the operator's cab 3 of the swing structure 1, a swing cylinder 20 for swinging the boom 5 left and right around the support shaft 11 with respect to the swing structure 1 extends in a substantially front-back direction. Is provided. The swing cylinder 20 has its rear end pivotally supported by the revolving superstructure 1, and a tip end portion of a piston rod 21 extending elastically forward of the revolving superstructure 1 serves as a mounting member 22 for mounting the boom 5 on the support shaft 11. It is pivotally attached. As a result, by expanding and contracting the piston rod 21 of the swing cylinder 20, the boom 5 swings left and right with respect to the revolving structure 1 with the support shaft 11 as a fulcrum while the cylinder 20 swings. There is.

At the center of the revolving superstructure 1 below the cab 3, a revolving hydraulic motor 24 for revolving the revolving superstructure 1 through a revolving bearing 23 and a traveling hydraulic motor for the traveling unit 2 (shown in the figure). No) is provided with a swivel joint 25 for supplying hydraulic oil from the revolving structure 1 side.

Further, in FIG. 2, 26 is a directional control valve 1.
4 is a plurality of pipes of hydraulic oil connected to No. 4. Each pipe 26 connected to the direction switching valve 14 passes through the piping gap 27 provided between the direction switching valve 14 and the operator's cab 3,
The boom cylinder 8, the arm cylinder 9, and the bucket cylinder 10 are connected to a plurality of hydraulic devices such as a swing cylinder 20, a turning hydraulic motor 24, and a swivel joint 25. Furthermore, the space for piping 2
7, the pipes 26 extending from the directional switching valve 14 to the plurality of hydraulic devices are centrally housed, and the directional switching valve 14 extends from the boom cylinder 8 to the arm cylinder 9 as shown in FIG.
And the pipe 2 extending toward the bucket cylinder 10.
6 extends linearly with respect to the arrangement direction of the cylinders 8, 9, 10. Further, as shown in FIG. 2, the direction switching valve 14 is provided close to the turning hydraulic motor 24, the swivel joint 25, etc.
The length of the pipe 26 extending from the turning hydraulic motor 24 to the swivel joint 25 is relatively short.

As shown in FIG. 2, the revolving superstructure 1 is sized so that the revolving region of the outer peripheral surface thereof is within the vehicle width of the hydraulic excavator including the traveling portion 2.

In the hydraulic excavator according to the present embodiment, at the time of work, the directional control valve 14 becomes relatively hot and produces an operating noise, but the directional control valve 14 is operated by the operator's cab 3.
Of the cab 3 and the directional control valve 1
4 is provided with a space 27 for piping, heat and operation noise generated from the direction switching valve 14 is reduced,
The heat and operation noise of the direction switching valve 14 are prevented from being directly transmitted to the cab 3. Therefore, the working environment of the operator in the driver's cab 3 becomes favorable, and the work can be comfortably performed.

Further, the direction switching valve 14 is protected against external contact by the hydraulic oil tank 15 and the fuel tank 16 which are arranged on the right side of the revolving superstructure 1 on the outer side thereof. For example, even when another object comes into contact with the revolving structure 1 from the outside, damage to the directional control valve 14 due to such contact can be reliably prevented.

With the arrangement of the directional control valve 14 as described above, when the directional control valve 14 and each of the pipes 26 are maintained, the maintenance can be easily performed through the pipe gap 27. In particular, since the pipes 26 are well housed in the pipe gap 27, they are excellent in maintainability in the pipe work. Furthermore, since the directional control valve 14 is arranged at a position in the vicinity of the rotation axis of the revolving structure 1, the directional control valve 14 and the respective directional control valves 14 are also extended when the pipes 26 are extended from the directional control valve 14 to a plurality of hydraulic devices. Since the distance to the hydraulic equipment can be made relatively short, and the length of each pipe 26 can also be made relatively short, the cost required for the pipe 26 can be reduced, and the oil pressure loss due to each pipe 26 can be reduced. It can be small.

Further, in this embodiment, the internal combustion engine 13
Is arranged so that the hydraulic pump 19 attached thereto is located on the left side and the cooling fan 17 and the radiator 18 are located on the right side, but as another embodiment, they may be arranged in the opposite direction. That is, as shown in FIG. 4, by locating the hydraulic pump 19 on the right side and the cooling fan 17 and the radiator 18 on the left side, the distance between the direction switching valve 14 and the hydraulic pump 19 can be made small. As a result, the length of the pipe 26 extending from the direction switching valve 14 to the hydraulic pump 19 can be shortened, which leads to cost reduction.

In each of the above embodiments, the fuel tank 16 and the hydraulic oil tank 15 are arranged in front and rear in this order. However, the hydraulic oil tank 15 is arranged on the front side and the fuel tank 16 is arranged on the rear side. Good.

In each of the embodiments, the cab 3 is provided with a cab, but the cab may be provided with an exposed cab in which a driver's seat, operation levers and the like are simply arranged. .

In each of the embodiments, a hydraulic excavator was used as an example of the hydraulic working machine, but a crane, etc.
Of course, the present invention can be applied to other hydraulic working machines.

[0036]

As is apparent from the above description, according to the present invention, since the directional control valve is placed at the side position in the operator's cab, heat and operation noise generated by the directional control valve during operation are eliminated. It is possible to reduce the transmission to the operator's cab, thereby improving the working environment of the worker. Further, maintenance of the directional control valve can be performed more easily than in the case where the directional control valve is mounted in the lower part of the operator's cab, and the maintainability can be improved. Further, since the directional control valve is mounted between the hydraulic oil tank and the fuel tank for the internal combustion engine and the operator's cab, the directional control valve is protected by the tanks and is damaged by contact with the outside. Can be prevented. Further, since the directional control valve is mounted at a position near the revolving axis of the revolving structure, the distance between each hydraulic device and the directional control valve can be shortened, and the length of the pipe can be shortened to reduce the cost. In addition, it is possible to prevent hydraulic pressure loss.

Furthermore, since the directional control valve is mounted in the front-rear direction, a space can be easily secured between the cab and the directional control valve, so that the cab and the directional control valve can be easily secured. A space for piping can be provided between them. By providing the space for piping, it is possible to easily perform piping work and maintenance of each piping through the space for piping.

A directional control valve is provided around the piping gap, and a swivel joint and hydraulic equipment such as a turning hydraulic motor and a hydraulic pump are provided around the piping cavity to provide the directional control valve. Not only can each pipe be extended well in a position close to the position, the length of the pipe can be shortened to reduce the cost,
The loss of hydraulic pressure can also be prevented.

Further, in addition to the directional switching valve and the swivel joint being provided in positions close to each other, a hydraulic device such as a turning hydraulic motor or hydraulic pump is provided in a position close to the directional switching valve. Since the distance from the direction switching valve to each hydraulic device can be reduced to shorten the length of the pipe, it is possible to further reduce the cost and prevent the loss of hydraulic pressure.

Further, the directional control valve is linearly provided in the front-rear direction of the revolving structure, and the pipe is extended linearly toward the boom in front of the revolving structure so that the pipe is cohesively concentrated in the space for the pipe. As a result, workability such as piping work and maintenance work can be improved.

[Brief description of drawings]

FIG. 1 is a side view of an example (hydraulic excavator) of a hydraulic working machine according to the present invention.

FIG. 2 is a schematic plan view showing a layout configuration of various devices mounted on the revolving structure of the hydraulic excavator of FIG.

FIG. 3 is an explanatory view of a directional control valve mounted on a revolving structure of the hydraulic excavator of FIG. 1 and a space for piping when viewed from the rear.

FIG. 4 is a schematic plan view showing a layout configuration of various devices mounted on a swing body of a hydraulic excavator according to another embodiment of the present invention.

[Explanation of symbols]

1 ... Revolving structure, 3 ... Operator's cab, 5 ... Boom 8 ... Boom cylinder (hydraulic cylinder), 9 ... Arm cylinder (hydraulic cylinder), 10 ... Bucket cylinder (hydraulic cylinder), 13
... internal combustion engine, 14 ... directional control valve, 15 ... hydraulic oil tank,
16 ... Fuel tank, 19 ... Hydraulic pump, 24 ... Turning hydraulic motor, 25 ... Swivel joint, 26 ... Piping, 2
7 ... Piping void.

Claims (6)

[Claims] 1. A hydraulic working machine having a driver's cab on one side of a front part, and a slewing body equipped with an internal combustion engine at the rear part, on which a directional control valve, a hydraulic oil tank, and a fuel tank for an internal combustion engine are mounted. The tanks are arranged in the front-rear direction at a position near the outer side of the other side of the front part of the revolving structure and mounted, and the tanks and the cab are located near the revolving axis of the revolving structure. A hydraulic working machine in which the directional control valve is mounted between the front and rear sides. 2. A pipe space for accommodating a pipe extending from the directional control valve to the hydraulic equipment mounted on the hydraulic working machine is provided between the cab and the directional control valve. The hydraulic working machine according to claim 1. 3. The hydraulic working machine according to claim 2, wherein the directional control valve is arranged around the pipe gap, and the hydraulic equipment is arranged around the pipe gap. 4. The directional control valve is provided at a position close to a swivel joint disposed at a position near a revolving axis of the revolving structure, and a hydraulic device mounted on the hydraulic working machine serves as the directional control valve. The hydraulic working machine according to any one of claims 1 to 3, wherein the hydraulic working machine is provided at positions close to each other. 5. The hydraulic working machine according to any one of claims 2 to 4, wherein the hydraulic equipment includes at least a swing hydraulic motor for a swing body and a hydraulic pump. 6. The pipe gap is provided linearly in the front-rear direction of the revolving structure, and the pipe extends linearly toward a boom provided with a plurality of hydraulic cylinders provided in front of the pipe gap. The hydraulic working machine according to any one of claims 2 to 5, wherein the hydraulic working machine is released.