JPH09203078A - Small slewing type hydraulic shovel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to be less subjected to restrictions under an influence of a bed of a truck by increasing a small slewing hydraulic shovel so that the maximum width of the upper part slewing body during a traveling posture may be larger than a traveling means and substantially identical to the width of a blade. SOLUTION: A small slewing hydraulic shovel is provided with a lower traveling body provided with a left crawler belt 4L and a right crawler belt 4R and a front member 3 which is turnably connected to an upper slewing body 2 loaded turnably on the upper part. The maximum width W1 of the upper slewing body 2 during a traveling posture is arranged to be substantially identical to the width W2 of a blade 5 where both W1 and W2 are arranged to be slightly larger than the maximum width W3 of the crawler belts 4L and 4R of the lower traveling body. Since the outside edge of a slewing mount frame 8 and a bonnet 20 is substantially arc-shaped, the maximum width W1 of the upper slewing body 2 is identical to a slewing diameter (d). This construction makes it possible to move forward the whole shovel based on the propriety of advancement of the blade and eliminate running-in work by one running in one direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called small turning hydraulic excavator, and more particularly to a small turning hydraulic excavator provided with a blade as one of working machines operated by a hydraulic actuator.

[0002]

2. Description of the Related Art Conventionally known technologies relating to this type of small turning hydraulic excavator include, for example, the following. [Patent Document 1] Japanese Unexamined Patent Publication No. 5-125473 In this known technique, an undercarriage equipped with left and right crawler belts, an upper revolving superstructure mounted on the upper part of the lower traveling carriage, and rotatably connected to the upper revolving superstructure. Boom arm
In a small swing type hydraulic excavator including a front member formed of a bucket and a blade provided on a lower traveling body, a maximum width in a traveling posture (in this case, equal to a swing diameter of an upper rotating body) A structure is disclosed in which the width is slightly smaller than the maximum width (= width from the left end of the left crawler belt to the right end of the right crawler belt). That is, as a result, the entire hydraulic excavator can enter wherever the undercarriage can enter, so that excavation work can be performed even in a narrower site. The blade width is substantially the same as the maximum width around the foot.

[0003]

However, the above-mentioned known technology has the following problems. (1) Judgment of entry possibility As described above, this type of small turning hydraulic excavator has its original purpose of being used in a place with a narrow width.
In the above-mentioned known technology, since the blade width and the maximum width of the suspension are almost the same, when the difference between the blade width and the width of the site is small, the entire shovel is advanced based on whether or not the blade can enter. It was difficult to judge whether it was good or not. In other words, even if the blade can enter, if there is no room in the width of the site, the end faces of the left and right crawler tracks, which are the outermost parts of the hydraulic excavator, can come into contact with the curb on the site road if you operate the steering wheel while running. There is a
In the case of iron tracks, the curb may be damaged, and in the case of rubber tracks proposed in recent years, the end surface of the tracks may be damaged and the life of the tracks themselves may be shortened. Therefore, in practice, it was difficult to use in a place where the width is narrower than a certain extent.

(2) Loadable width during truck transportation The hydraulic excavator is usually transported by being loaded on a truck bed up to the excavation site. Here, in general, a truck bed has a side wall having a certain thickness (for example, about 20 mm to 60 mm) called a tilt on the left side.
Since they are provided on both right sides, the width between these two tilts is the maximum width that can be loaded, and the foot width of the hydraulic excavator is limited by this width. Here, in the above-mentioned known technique, the maximum width of the upper swing body in the traveling posture and the width of the undercarriage are substantially equal to each other. Therefore, the maximum width of the upper swing body is also limited by the flapping. However, usually
Since the height of the tilt is relatively low, it does not interfere with the upper revolving structure when it is loaded on the bed. That is, even if the maximum width of the upper swing body is slightly larger than the width of the gap, there is no problem in loading on the platform. Therefore, the width of the upper swing body of the hydraulic excavator according to the above-mentioned known technology is unnecessarily limited from the viewpoint of the loadable width, and the space around the driver's seat is increased by increasing the maximum width. For a small turning hydraulic excavator that wants to be as wide as possible, it is possible to use the track width more effectively by making the maximum width in the running posture larger than the suspension width by the thickness of the tilt. Further, in this case, since the blade does not interfere with the tilt as long as it is loaded in a state of being raised upward during transportation, it is not necessary to match the blade width with the suspension width.

(3) Leveling work by blades One of the works performed in a hydraulic excavator equipped with blades is so-called leveling work. This is a work in which the blade provided on the front side of the lower traveling body is brought into contact with the ground and travels rearward, thereby erasing the marks of the left and right crawler tracks of itself and finishing the site surface smooth. Here, in the above-mentioned known technology, since the blade width and the maximum width around the foot are substantially the same, the blade can completely erase the marks on the left and right crawler tracks when the traveling direction is slightly deviated during work. There was a possibility that it could not be done and the track marks would remain. In that case, it was necessary to drive again to erase the residual marks, and the work efficiency deteriorated. In addition, since the operator uses nerves to prevent the traveling direction from shifting as much as possible, it causes fatigue and it is difficult to improve work efficiency.

An object of the present invention is to easily judge whether or not it is possible to enter a site having a narrow width, and effectively use the loadable width of the truck to widen the space around the driver's seat. (EN) It is possible to provide a small-swing hydraulic excavator that can perform a single run in one direction and can remove traces of a crawler belt with a sufficient margin to improve work efficiency in leveling work.

[0007]

In order to achieve the above-mentioned object, according to the present invention, an undercarriage equipped with traveling means,
An upper revolving structure rotatably mounted on the upper part of the lower traveling structure, a front member rotatably connected to the upper revolving structure, and a blade for earth removal provided on the lower traveling structure. In the small swing hydraulic excavator, the upper revolving superstructure has a maximum width in a running posture that is larger than the maximum width of the traveling means of the lower traveling superstructure, and the width of the blade is the width of the upper revolving superstructure. (EN) Provided is a small turning hydraulic excavator, which is approximately the same as the maximum width in a posture. That is, in the small swing type hydraulic excavator, the maximum width of the upper swing body in the running posture and the width of the blade are substantially the same, and these two are provided on the running means of the lower swing body, for example, both left and right sides. Larger than the maximum width of the track. As a result, the following three actions are achieved. First, by making the width of the blade larger than the maximum width of the traveling means, when trying to enter a place where the width is narrow, it is easy to judge whether or not the entire shovel is allowed to enter based on whether or not the blade can enter. can do. That is, by making the width of the blade slightly larger than the maximum width of the traveling means, as long as the blade can enter, even if the traveling direction is slightly bent by steering operation etc., the traveling means is traveling like the conventional structure. There is no possibility of contacting the curb. Therefore, the entire shovel can be entered with a sense of security, and can be actually used even in a narrow place to some extent. At this time, the maximum width of the upper revolving structure in the running posture is substantially the same as the width of the blade and is slightly larger than the maximum width of the traveling means, but the upper revolving structure has a height difference with the curb and does not interfere with the problem. Absent. This also leads to effective use of the truck width during truck transportation. That is, by making the maximum width of the upper swing body in the running posture larger than the width of the traveling means by the thickness of the tilt of the truck bed (for example, about 20 mm to 60 mm), the width of the upper swing body is tilted like the conventional structure. Since it is possible to avoid unnecessary restriction due to the above, it is possible to increase the space around the driver's seat for trucks having the same maximum width. If the width of the upper revolving structure is the same, the width of the traveling means can be reduced accordingly, so that the tilt of the truck bed can be prevented from being damaged. In addition, the fact that the width of the blade is larger than the maximum width of the traveling means also improves the work efficiency in the leveling work. That is, even if the traveling direction is slightly deviated when traveling rearward while the blade is in contact with the ground, since the blade width is large, it is possible to completely erase the marks of the left and right crawler belts in one direction once. it can. Therefore, it is not necessary to travel again to erase the residual marks unlike the conventional structure in which the unerased portion may occur,
The operator can work efficiently with a margin.

Preferably, in the small turning hydraulic excavator, the turning diameter of the upper turning body is larger than the maximum width of the running means of the lower running body, and the width of the blade is the upper turning. There is provided a small turning hydraulic excavator characterized in that the turning diameter of a body is substantially the same.

Further preferably, in the small turning hydraulic excavator, the running means of the lower traveling body is a crawler track provided on both left and right sides with respect to the running direction. Will be provided.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A small turning hydraulic excavator according to an embodiment of the present invention will be described with reference to FIGS. FIG.
It is a partial perspective view showing the equipment structure of the hydraulic excavator,
3 is a side view showing the entire structure of the hydraulic excavator, FIG. 1 is a top view, and FIG. 4 is a front view with a front member and a blade (described later) removed. However, in FIG. 4, the blade positions are additionally shown by imaginary lines for the sake of clarifying the structure. 1 to 4, a hydraulic excavator according to the present embodiment is provided with a lower traveling body 1 provided with left and right crawler tracks 4L and R as traveling means, and an upper portion which is rotatably mounted on the upper portion of the lower traveling body 1. It has a revolving superstructure 2 and a front member 3 rotatably connected to the upper revolving superstructure 2.

The undercarriage 1 has a substantially H-shaped track frame 38, and drive wheels 39L and 3L rotatably supported near the rear ends of the left and right sides of the track frame 38.
9RR (not shown), left and right traveling motors 41L and R for driving the drive wheels 39L and R, and crawler belts 4L rotatably supported near the left and right front ends of the track frame 38.
For earth removal supported by rotating wheels (idlers) 40L and 40R (not shown) rotated from the drive wheel 39 via 4R and a blade cylinder 6 provided on the front side of the track frame 38 so as to be vertically movable. Blade 5 of. A swivel bearing 7 is arranged in the center of the lower traveling body 1.

The upper revolving structure 2 includes a revolving base frame 8 provided above the revolving base bearing 7. As shown in FIG. 1, the swivel base frame 8 has a substantially horizontal horizontal cross-sectional shape, a front member pivot shaft 9 serving as a front member fulcrum portion is provided in the front portion, and the lower end of the front member 3 is It is pivotally supported by a front member pivot shaft 9. A swivel motor 35 is arranged near the center of the swivel frame 8.

The front member 3 comprises a boom 10 composed of a lower boom 10L and an upper boom 10U, an arm 11 rotatably connected to the upper boom 10U, and a bucket 12 rotatably connected to the arm 11. Has been done. The lower boom 10L, the arm 11, and the bucket 12 are operated by the boom cylinder 36, the arm cylinder 13, and the bucket cylinder 14, respectively. At this time, the upper boom 10U is operated by the cross link 37 connecting the swivel base frame 8 and the upper boom 10U according to the operation of the boom cylinder 36, that is, the rotation angle of the lower boom 10L with respect to the swivel base frame 8. The opening angle with respect to is changed. Also, lower boom 10L
Is a swing cylinder 1 for enabling gutter digging.
It is possible to swing left and right by 5.

A driver's cab 21 having a seat 16 and a canopy roof 17 is provided on the left side of the swivel frame 8 in the traveling direction, and a fuel tank 45 is provided on the right side. Further, a hydraulic oil tank 46 is arranged further rearward, and the whole is covered with the bonnet 20.

In front of the seat 16 in the driver's cab 21, left and right hydraulic motors 41L and R for driving the crawler belts 4L and R, which are arranged in the lower traveling body 1 respectively, are driven.
The right traveling levers 27L, R, a swing pedal 31 for driving the swing cylinder 15 to swing the lower boom 10L, and a front stay 28 for preventing the operator from falling forward are provided. Left and right work levers 26L, R for driving the boom cylinder 36, the arm cylinder 13, and the bucket cylinder 14 to operate the lower boom 10L, the arm 11, and the bucket 12 are provided on both sides of the seat 16. A side stay 29 and a side cover 30 are provided on the left side of the seat 16 to prevent the operator from falling to the left side.
On the right side of 6, the blade cylinder 6 is driven to drive the blade 5
There are provided a blade lever 32 for moving the fuel cell up and down, a switch monitor panel 34 on which various switches and monitors are arranged, and a fuel lever 33 for controlling fuel supply from a fuel tank.

In the above structure, each hydraulic actuator is driven by a known hydraulic drive device. Further, in the above structure, the maximum width W ₁ of the upper swing body 2 in the traveling posture as shown in FIG. 4 is substantially the same as the width W _{2 of} the blade, and both W ₁ and W ₂ are lower traveling. It is slightly larger than the maximum width around the legs of the body 1, that is, the width W ₃ from the left end of the left crawler belt 4L to the right end of the right crawler belt 4R. Here, in the present embodiment, since the outer edges of the swivel base frame 8 and the bonnet 20 are substantially arcuate (see FIGS. 1 and 4), the maximum width W of the upper swing body 2 in the running posture is W. ₁ is equal to the swing diameter d of the upper swing body 2.

According to the present embodiment configured as described above, the maximum width W _{1 of} the upper swing body 2 in the traveling posture and the blade 5
And the width W ₂ thereof is substantially the same, and these two are made larger than the maximum width W ₃ of the crawler belts 4L and 4R provided on both the left and right sides of the lower traveling body 1. As a result, the following three effects are achieved. First, set the width W _{2 of the} blade 5 to the track 4L,
By making it slightly larger than the maximum width W _{3 of} 4R, it is possible to easily judge whether or not the entire shovel is allowed to enter, based on whether or not the blade 5 can enter, when trying to enter a place where the width is narrow. it can. That is, as shown in FIG. 5A, as long as the blade 5 can enter, the conventional structure (W ₂ ≈W ₃ shown in FIG. 5B) even if the traveling direction is slightly bent by steering operation or the like. There is no possibility that the crawler belts 4L and 4R will come into contact with the curb 22 during traveling as in (1). Therefore, the entire shovel can be entered with a sense of security, and can be actually used even in a narrow place to some extent. At this time, the maximum width W ₁ of the upper swing body 2 in the running posture is substantially the same as the width W _{2 of the} blade 5 and slightly larger than the maximum width W ₃ of the crawler belts 4L and 4R, but the upper swing body 2 has a curb. There is no difference because there is a difference in height with No. 22, so there is no problem. This also leads to effective use of the truck width during truck transportation. That is, as shown in FIG. 6A, the thickness of the tilt 23 of the truck carrier (for example, about 20 mm to 60 mm).
Min., The maximum width W ₁ of the upper swing body 2 in the running posture is the track 4L,
By slightly increasing the maximum width W _{3 of} 4R, the width of the upper revolving superstructure 2 has a conventional structure (W ₁ ≈W ₃ , FIG. 6B).
Since it is possible to avoid unnecessary restriction by the tilt 23 as shown in FIG. 2), the space of the cab 21 can be increased correspondingly for trucks having the same maximum width.
If the upper revolving structure width is the same, the maximum width W of the tracks 4L, 4R
Since the size of ₃ can be reduced, damage to the tilt 23 of the truck bed can be prevented. Further, the width W _{2 of the} blade 5 is equal to that of the crawler belt 4.
The fact that the width is larger than the maximum width W ₃ of L and 4R also leads to improvement of work efficiency in the leveling work. That is, FIG.
As shown in, even if the traveling direction is slightly deviated when traveling rearward while the blade 5 is grounded, the width W _{2 of the} blade 5 is large, so that the left and right crawler belts 4L and 4R are
The mark 24 is completely erased by running once in one direction, and the flat surface 25
It can be. Therefore, unlike the conventional structure in which the unerased portion may be left, it is not necessary to travel again to erase the residual mark 24, and the operator can work efficiently with a margin.

The small-turn hydraulic excavator in the above-described embodiment has a lower boom 10L and an upper boom 10U.
Although it is provided with a so-called two-piece boom, the present invention is not limited to this, and can be applied to a so-called mono-boom type, and the same effect can be obtained in this case. Further, although the small turning hydraulic excavator in the above-described embodiment is of a swing type in which the lower boom 10L swings, the present invention is not limited to this and can be applied to a so-called offset type, and the same effect can be obtained in this case.

Further, the small turning hydraulic excavator in the above-mentioned embodiment uses the crawler belt 4 as the traveling means of the lower traveling body 1.
Although L and 4R are provided, the present invention is not limited to this and may be of a type that travels with tires. Also in this case, the same effect can be obtained by taking the width W ₃ from the left end of the left tire to the right end of the right tire.

[0020]

According to the present invention, in a small swing type hydraulic excavator, the width of the blade is larger than the maximum width of the traveling means. Therefore, when trying to enter a place where the width is narrow, it is based on whether or not the blade can enter. , It is possible to easily determine whether or not the entire shovel can enter. Therefore, the entire shovel can be entered with a sense of security, and can be actually used even in a narrow place to some extent. Then, in the leveling work, even if the traveling direction is slightly deviated when traveling backward while the blade is grounded, the marks on the left and right crawler belts can be completely erased by traveling once in one direction. Therefore, the operator can work efficiently with a margin. Further, since the maximum width of the upper revolving structure in the traveling posture is larger than the width of the traveling means, it is possible to prevent the width of the upper revolving structure from being unnecessarily restricted by the tilt as in the conventional structure. Therefore, if the trucks have the same maximum width, the space around the driver's seat can be widened accordingly, and if the width of the upper revolving structure is the same, the width of the traveling means can be reduced accordingly, so that the tilt of the truck carrier can be prevented from being damaged. .

[Brief description of drawings]

FIG. 1 is a top view of a hydraulic excavator according to an embodiment of the present invention.

FIG. 2 is a partially transparent perspective view showing a device structure of the hydraulic excavator shown in FIG.

FIG. 3 is a side view showing the overall structure of the hydraulic excavator shown in FIG.

FIG. 4 is a front view of the hydraulic excavator shown in FIG. 1 with a front member and blades removed.

FIG. 5 is a diagram for explaining a function and effect of facilitating the determination as to whether or not the vehicle can enter the hydraulic excavator according to the embodiment of the present invention.

FIG. 6 is a diagram for explaining the function and effect of effective use of the vehicle width of the truck of the hydraulic excavator according to the embodiment of the present invention.

FIG. 7 is a diagram for explaining a function and effect of improving the leveling work efficiency of the hydraulic excavator according to the embodiment of the present invention.

[Explanation of symbols]

1 Undercarriage 2 Upper revolving structure 3 Front member 4L, R Crawler track 5 Blade 8 Swiveling frame 10 Boom 10L Lower boom 10U Upper boom 11 Arm 12 Bucket 20 Bonnet 22 Curb 23 Crawl track Crawler track W ₁ Maximum body width W ₂ Blade width W ₃ Width from left side of left track to right side of right track

Claims (3)

[Claims] 1. A lower traveling body equipped with traveling means, and an upper revolving body rotatably mounted on an upper portion of the lower traveling body,
In a small swing type hydraulic excavator having a front member rotatably connected to the upper swing body and a blade for earth removal provided on the lower runner, the upper swing body is set to a maximum in a running posture. The width is substantially larger than the maximum width of the traveling means of the lower traveling body, and the width of the blade is substantially the same as the maximum width of the upper revolving body in the traveling posture. Hydraulic excavator. 2. The small swing hydraulic excavator according to claim 1, wherein the upper swing body has a swing diameter larger than a maximum width of a traveling means of the lower traveling body, and a width of the blade is: A small swing hydraulic excavator, which has a swing diameter substantially equal to that of the upper swing body. 3. The small turning type hydraulic excavator according to claim 1, wherein the running means of the lower running body is a crawler track provided on both left and right sides with respect to the running direction. Hydraulic excavator.