JPH02308016A - hydraulic excavator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a top-swivel type and wheel type hydraulic excavator.

[Conventional technology]

The above-mentioned conventional hydraulic excavator has a structure as shown in Fig. 4, in which an upper revolving body is rotatably mounted on a wheel-type traveling vehicle body a, and an upper revolving body is located behind the operator's cab C. It was equipped with engine d. Further, a balance weight e is attached to the rear end of this upper revolving body.

Furthermore, an excavating machine i consisting of a boom f, an arm g, a bucket h, etc. is mounted on the upper revolving body so as to be able to raise and lower. The proximal end of the rotor was pivoted to the side of the driver's cab e, and was disposed toward the front from this pivot.

[Problem to be solved by the invention]

In the above-mentioned conventional hydraulic excavator, since the excavating work machine i is protruded in front of the upper revolving body, visibility to the front and side (right side) is poor when traveling, and furthermore, In order to cope with the weight of the excavating work machine i, the upper revolving body has to be lengthened rearward, resulting in a problem that the turning radius of the upper revolving body has become larger.

In addition, the height of the excavator i and engine d was increased, and the stability of the vehicle was poor. In particular, since the center of gravity of the excavating machine i was located in the front, dynamic stability (pitching) during running was poor.

The present invention was developed in consideration of the above-mentioned problems, and it improves the forward and side visibility from the driver's cab while driving, and lowers the center of gravity of the excavating machine and engine, thereby improving the vehicle's visibility. Stability is improved, and the longitudinal length of the upper revolving body can be shortened when the excavator is in use, making it possible to reduce the turning radius, for example, making it possible to turn within the width of the vehicle, making it easier to work in narrow spaces. The purpose of the present invention is to provide a hydraulic excavator that can perform excavation in a stable state, and has the effect of improving the longitudinal balance of the vehicle body during running and improving dynamic stability. That is.

[Means to solve the problem]

In order to achieve the above object, a hydraulic excavator according to the present invention includes a bucket, an arm, a boom, a bucket cylinder, an arm cylinder, a boom cylinder, etc. for operating these, on an upper revolving body rotatably mounted on a traveling vehicle body. In this hydraulic excavator, the boom of the excavating machine is composed of a first boom connected to the upper revolving body and a second boom connected to the arm side, and this is connected to the upper revolving body. It can be folded into a state that extends rearward, and the engine is mounted on the front end of the vehicle body.

[For production]

By folding the boom of the excavator, the height of the excavator is lowered and its center of gravity is moved rearward to balance this with the weight of the engine mounted at the front end of the vehicle.

〔Example〕

Embodiments of the present invention will be described based on FIGS. 1 to 3.

In the figure, reference numeral 1 denotes a wheel-type traveling vehicle body, and an engine 2 is mounted on the front end of the traveling vehicle body 1, and the traveling drive section of the traveling vehicle body 1 is connected to the engine 2 by a power transmission mechanism (not shown). .

Reference numeral 3 designates an upper revolving body rotatably mounted on the traveling vehicle body 1, and a driver's cab 4 is attached to the front part of the upper revolving body 3, and a counterweight 5 is attached to the rear end of the upper revolving body.

Reference numeral 6 denotes an excavating work machine, and this excavating work machine 6 consists of a bucket 7, an arm 8 connected to the bucket 7, and a boom connected to the arm 8. The boom 9 of this excavating work machine 6 consists of a first boom 9a whose base end is connected to the upper revolving structure 3, and a second boom 9b whose tip end is connected to the arm 8. Second boom 9a.

9b is foldably connected to the rear of the revolving upper structure 3. And this first one. Second boom 9a, 9b
The connecting portion includes a connecting portion 10 for integrally configuring these.
a and 10b are provided.

The tip of a boom cylinder 11 whose base end is connected to the upper revolving structure 3 is connected to the tip of the first boom 9a,
Further, the second boom 9b and the arm 8 are connected to the arm cylinder 12.
, arm 8 and bucket 7 are connected to bucket cylinder 13.
are connected to each other.

The base end of the boom cylinder 11 is located forward and lower than the base end 9C of the first boom 9a, and when the boom 9 is folded, the axis of the boom cylinder 11 is at the base end of the first boom 9a. The boom cylinder 11 prevents the first boom 9a from being raised or lowered toward the front of the upper revolving structure 3.

A bucket 7 of an excavating machine 6 is attached to the front end of the traveling vehicle body 1.
A bucket holding base 14 that engages with the claws is fixed.

Further, 15 is a swivel joint that connects the hydraulic circuit between the traveling vehicle body 1 and the upper rotating body 3.

The excavating machine 6 is provided on the side of the revolving body 3, and when it is folded and stored, the excavating machine 6 is attached to the upper revolving body 3.
Also, it is designed not to interfere with the mounting portion of the balance weight 5.

Note that the upper revolving body 3 may be configured in a U-shape when viewed from the front, and the excavating work machine 6 may be mounted within this U-shape.

In the above configuration, in order to change the excavating work machine 6 from the folded and stored state shown in FIG. 1. Fix the boom 9a. Next, while expanding and contracting the bucket cylinder 13 to engage and hold the tip of the bucket 7 with the bucket holding base 14 and opening the hydraulic circuit of the boom cylinder 11, the arm cylinder 1 is moved.
2, and the first boom 9a is activated after passing through the dead center. In this state, the first boom 9a and the second boom 9b
The mutual connecting parts 10a and 10b are connected by a pin 15 to form an integral boom 9, which is brought into use as shown in FIGS. 2 and 3.

When the excavating machine 6 is folded and stored, the above operation is performed in reverse.

That is, first, the bucket 7 is engaged and held on the bucket holding base 14, and then the pin 15 is removed and the first. 2nd boom 9
Make a and 9b foldable. Next, the arm cylinder 12 is placed in a floating state, the bucket cylinder 13 and the boom cylinder 11 are extended, and the first boom 9a is tilted backward to the dead center. Next, all cylinders 11, 12° 13
The hydraulic housing will be gradually opened and stored.

The excavating machine 6 in the folded state as described above has a reduced dimension in the height direction and is extended rearward. For this reason, the center of gravity of the excavating machine 6 itself is lowered and located behind the center of rotation of the upper revolving structure 3.

Next, the excavation work shown in FIGS. 2 and 3 will be explained.

First, in order to perform heavy excavation work, as shown in FIG. 2, the work is performed with the upper revolving body 3 directed toward the rear of the traveling vehicle body 1.

At this time, the engine 2 mounted on the front end of the traveling vehicle body 1 serves as a balance weight, and the balance of the traveling vehicle body 1 during heavy excavation is stabilized.

In the state shown in FIG. 3 in which the revolving upper structure 3 is oriented laterally with respect to the traveling vehicle body 1, excavation work (heavy excavation) can be carried out within the range of balance by the balance weight 5 attached to the rear of the revolving upper structure 3. It will be done.

Note that the balance of the excavation work during the above-mentioned heavy excavation can be achieved by the weight of the engine mounted on the traveling vehicle body 1, so the balance by the rear part of the upper revolving structure 3 may be made small.

Therefore, the length of the upper revolving body 3 in the front-rear direction on the rear side of the rotation center may be short.

Therefore, the radius of the rear end of this upper revolving body 3 is shortened, and it can be accommodated within the vehicle width of the traveling vehicle body 1 as shown in FIG. The work becomes easier.

〔Effect of the invention〕

According to the present invention, since the storage posture of the excavation work machine 6 can be made low, visibility from the driver's cab 4 to the front and side can be improved when traveling with the excavation work machine 6 stored. be able to.

In addition, the center of gravity of the excavating machine 6 and engine 2 in the retracted state is lowered, and the excavator in the retracted state is extended rearward, and its center of gravity is located behind the center of the vehicle body. This balances the weight of the engine 2 and improves the dynamic stability of the vehicle. Furthermore, since the weight of the engine 2 on the traveling vehicle body 1 side can be used as a balance weight during excavation work, this excavation work can be performed stably, and the rear end radius of the upper revolving structure 3 can be shortened.

Since the radius of the rear end of this upper revolving body 3 is short,
It is possible to turn within the width of the vehicle, making it easier to work in narrow spaces. Furthermore, according to the present invention, the engine 2
By mounting this on the traveling vehicle body 1 side, the power transmission mechanism between the engine 2 and the traveling vehicle body 1 can be simplified, and maintainability can be improved.

[Brief explanation of the drawing]

1 to 3 show embodiments of the present invention. FIG. 1 is a side view of the excavating machine in a folded state, and FIGS. 2 and 3 are diagrams showing the excavating operation state. FIG. 4 is a side view showing a conventional example. 1 is a traveling vehicle body, 2 is an engine, 3 is an upper revolving structure, 6 is an excavating machine, 7 is a bucket, 8 is an arm, 9 is a boom, 9
a, 9b are the first. Second boom.

Claims (1)

[Claims] An upper revolving body 3 rotatably mounted on a traveling vehicle body 1 is equipped with an excavating machine 6 consisting of a bucket 7, an arm 8, a boom 9, a bucket cylinder 13, an arm cylinder 12, a boom cylinder 11, etc. for operating these. In the excavator, the boom 9 of the excavating work machine 6 is mounted on the upper revolving body 3.
It is composed of a first boom 9a connected to the side and a second boom 9b connected to the arm 8 side, and can be folded while projecting to the rear of the revolving upper structure 3, and the front end of the traveling vehicle body 1 A hydraulic excavator characterized by having an engine 2 installed in the section.