JP2000179004A - Slewing type working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To work even in a small place while having large excavating force by setting an overhanging amount from a lower traveling body within such a specific range that overhanging does not interfere with an obstacle when an upper slewing body is in a horizontal posture. SOLUTION: This slewing type working vehicle is formed so that an upper slewing body 20 may be turnably-attached to a lower traveling body 10, and a working machine 30 may be attached to the upper slewing body 20 with the machine facing forward, wherein the rear end part 23 of the upper slewing body 20 is stored in the fore/aft section of the lower slewing body 10 when the upper slewing body 20 is in a fore/aft posture. The rear end part 23 overhangs outward beyond the right and left sides 10b, 10b of the lower traveling body 10 when the upper turning body 20 is in a horizontal position, and an overhanging amount L is set within 10% of the overall width of the lower slewing body 10 or within at least 250 mm to at most 450 mm. It is thus possible to work even in a small place like a microcompact slewing type working vehicle while having excavating force larger than the microcompact slewing type working vehicle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a revolving work vehicle for excavating earth and sand at a civil engineering work site or the like.

[0002]

2. Description of the Related Art As a turning-type work vehicle, a lower traveling body,
There is known an upper revolving unit that is rotatably attached to the lower traveling unit, and a work machine that is attached to the upper revolving unit so as to be vertically swingable forward. This turning type work vehicle is of two types, a standard type and a micro turning type.

[0003] A standard turning type work vehicle has a structure in which the upper revolving structure is oriented forward and backward with respect to the lower traveling structure (that is, the working machine is oriented in the traveling direction of the lower traveling structure). The end extends beyond the front and rear part of the lower traveling structure (that is, the end in the traveling direction), and the upper revolving structure is oriented laterally with respect to the lower traveling structure (that is, when the work implement is running on the lower traveling structure). The rear end of the upper revolving structure projects more outwardly than the left and right sides of the lower traveling structure (that is, the ends in the direction perpendicular to the traveling direction) when the posture is in the direction perpendicular to the direction.

[0004] In the ultra-small turning type work vehicle, the attitude of the upper revolving unit in the front-rear direction with respect to the lower traveling unit (that is, the turning vehicle) is
When the work machine is in the posture of the lower traveling structure in the traveling direction), the rear end of the upper revolving structure falls within the front and rear portions of the lower traveling structure (that is, the end in the traveling direction), and the upper revolving structure rotates upward with respect to the lower traveling structure. When the body is in a laterally oriented position (that is, the working machine is oriented in a direction perpendicular to the traveling direction of the lower traveling structure), the rear end of the upper revolving structure is moved to the left and right sides of the lower traveling structure (that is, the traveling direction). At right angles).

[0005] In the above-mentioned standard turning type work vehicle, the distance from the rear end of the upper turning body to the turning center is long and the rear turning moment of the upper turning body is large. It is hard to fall. For this,
It is a revolving work vehicle with high excavation power and high workability.

However, since the rear end of the upper revolving structure projects beyond the front and rear portions and the left and right sides of the lower traveling structure, it interferes with obstacles near the lower traveling structure when turning the upper revolving structure. Might be.

[0007] For this reason, when turning the upper revolving structure, the operator carefully turns around while checking the safety while checking the safety, so that the turning operation is troublesome and not suitable for work in a narrow place.

[0008] In the above-mentioned ultra-small-turn type work vehicle, the rear end of the upper revolving structure is located in the front and rear portions and the left and right sides of the lower traveling structure, so that it interferes with obstacles near the lower traveling structure. Because of this, the safety at the time of turning is excellent and the turning operation by the operator is easy. In addition, since the upper revolving unit can be turned even if there is an obstacle near the lower traveling unit, it is easy to work even in a narrow place.

However, since the distance from the rear end of the upper revolving structure to the center of rotation is short and the rearward revolving moment of the upper revolving structure is small, the vehicle body leans forward due to the forward rotating moment generated by the excavating force of the work implement. easy. For this reason, a large excavating force cannot be obtained as compared with a standard turning type work vehicle.

In addition to the working machine, equipment such as a cab and an engine, a hydraulic pump, and a hydraulic valve are attached to the upper revolving unit. As described above, the distance from the center of rotation of the upper revolving unit to the rear end thereof is increased. However, the installation space of these devices is small, and the installation of those devices is difficult. In particular, when a counterweight is attached near the rear end of the upper revolving structure, the rear end of the upper revolving structure described above becomes the rear end of the counterweight. For this reason, the installation space of the equipment of the upper revolving superstructure becomes smaller due to the counterweight, so that it is difficult to install the equipment, and it is not possible to install each equipment in an orderly manner in consideration of maintainability.

[0011]

As described above, the conventional standard turning type working vehicle and the ultra-small turning type turning type working vehicle have contradictory advantages and disadvantages. The user (user) selects one of the revolving work vehicles according to the type of work in order to work efficiently.

For example, at a work site where there is no obstacle around such as a land reclamation work or a river work, a standard revolving work vehicle having a large excavation force is used. If there is an obstacle such as a house wall in the surrounding area such as sewerage work or gas work in an urban area, use an ultra-small turning type turning work vehicle with excellent turning safety.

[0013] As described above, since a standard turning work vehicle and a micro turning turning work vehicle are required to efficiently perform different kinds of work, the economic burden on the user is large.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a turning type working vehicle which can solve the above-mentioned problem of increasing the economic burden on the user.

[0015]

Means for Solving the Problems and Functions / Effects As a result of the inventor's intense research on how to use the turning work vehicle, the following has been found.

In the case of excavating a trench at a place where there is an obstacle in a turning work vehicle of an ultra-small-turn type, the trench is excavated by a work machine while traveling along an obstacle with a lower traveling body. It is difficult to run straight on the lower traveling body, and travels while slightly meandering to the left and right, so that the left and right sides of the lower traveling body are separated from the obstacle by a predetermined distance. From this, the present inventors have found an area in which the rear end of the upper revolving structure protrudes beyond the left and right sides of the lower traveling structure in the ultra-small revolving type turning work vehicle, and there is no problem in work, and the present invention has been achieved.

According to a first aspect of the present invention, there is provided a lower traveling body 10, an upper revolving body 20 rotatably mounted on the lower traveling body 10,
A work machine 30 attached to the upper revolving unit 20 facing forward.
In the revolving work vehicle provided with:
Is in the front-rear direction, the rear end portion 23 of the upper revolving structure 20 fits in the front-rear portion 10a of the lower traveling structure 10, and when the upper revolving structure 20 is in the horizontal position, the upper revolving structure 2
The rear end portion 23 of the lower traveling body 10 projects outward from the left and right side portions 10b of the lower traveling body 10, and the amount of the extension is between the lower traveling body 10 and the obstacle that can travel along the obstacle without interfering with the obstacle. A turning type work vehicle characterized by being about a distance.

According to the first aspect of the present invention, the rear end 23 of the upper revolving structure 20 protrudes outward beyond the left and right side portions 10b of the lower traveling structure 10 when the upper revolving structure 20 is in the sideways posture, so that the center of the revolving structure can be obtained. The distance to the rear end is larger than that of the ultra-small turning type work vehicle. As a result, the excavating force of the working machine can be increased. Further, since the space for mounting the device is widened, the device can be mounted neatly so that the device can be easily inspected.

The overhang amount is approximately the distance between the lower traveling body 10 and the obstacle that can travel along the obstacle without interfering with the obstacle. Work in narrow places.

Together with the above, the turning type working vehicle according to the first aspect of the present invention can work in a narrow place as in the case of the micro turning type working vehicle. Greater excavation force than the turning type work vehicle of the above.

According to a second aspect of the present invention, there is provided a turning-type work vehicle according to the first aspect, wherein the amount of overhang is within 10% of the entire width of the undercarriage (10).

According to the second aspect of the present invention, the overhang amount can be set to a size corresponding to the size of the upper swing type work vehicle, and the upper swing body 20 can be made to have a size corresponding to the size of the upper swing type work vehicle. An engine, a fuel tank,
Space for installing a hydraulic oil tank etc. can be secured.

According to a third aspect, in the first aspect, the overhang amount is at least 250 mm to at most 450 m.
m is a turning type work vehicle.

According to the third aspect of the present invention, a person who performs inspection and maintenance around the revolving work vehicle can freely walk around at the time of start-up inspection or failure inspection when the vehicle is stopped. Easy.

According to a fourth aspect of the present invention, in the first, second or third aspect, the upper swing body 20 has a shape in which a counterweight 22 is attached to a rear portion of an upper frame 21, and a rear end of the counterweight 22 has a rear end. Rear end 23 of upper revolving superstructure 20
The counterweight 22 has a front end face including an arc-shaped rear end face 48, left and right front end faces 49, and a left and right center recess 50, and faces the left and right center recess 50 near the rear of the upper frame 21. This is a revolving work vehicle in which a device is mounted at a position where the counterweight 22 is arranged from the rear of the device to the left and right sides.

According to the fourth aspect of the present invention, since the counterweights 22 are provided on the rear portion and on both right and left sides of the device, the counterweights 22 are large in plane size and heavy. As a result, the weight of the counterweight 22 increases even though the rear end surface of the counterweight 22 does not protrude rearward greatly, so that the excavating force can be increased without impairing workability in a narrow place.

According to a fifth aspect, in the third aspect, a counterweight 22 made of cast iron and a counterweight 22 made of concrete are provided, and both counterweights 22 have the same front end face shape and the same shape attached to the upper frame 21. so,
The turning type work vehicle in which the rear end face 48 of the concrete counterweight 22 is closer to the rear than the rear end face 48 of the cast iron counterweight 22.

According to the fifth aspect, one of the cast iron counterweight 22 and the concrete counterweight 22 can be selectively attached to the upper frame 21.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG.
The upper revolving unit 20 is attached at 0 to be freely rotatable. A working machine 30 is attached to the upper swing body 20 so as to face forward. The lower traveling body 10 includes a pair of right and left crawler traveling bodies 11.
It has. In this crawler type traveling body 11, a drive wheel 13 and a driven wheel 14 are attached to the front and rear of a track frame 12 in the longitudinal direction, and a crawler belt 15 is wound around the drive wheel 13 and the driven wheel 14. The track frames 12 of the pair of right and left crawler-type traveling bodies 11 are connected by a lower frame 16 as shown in FIG.

The upper revolving superstructure 20 has a counterweight 22 at the rear end of an upper frame 21 called a revolving frame.
The counterweight 2 is attached detachably.
2 is a rear end 23 of the upper swing body 20. The upper frame 21 is connected to the lower frame 16 by the turning mechanism 2.
4 so as to be pivotable. The turning center 25 of the upper revolving unit 20 is the central part in the front-rear direction of the lower traveling unit 10 and the central part in the left-right direction.

The working machine 30 comprises a boom 31 and an arm 32
, A bucket 33, a boom cylinder 34, an arm cylinder 35, and a bucket cylinder 36. Boom 31
And a boom cylinder 34 are attached to the upper swing body 20 so as to be vertically swingable.

As shown in FIG. 1, the upper revolving unit 20 is oriented in the front-rear direction (that is, when the work implement 30 is
In the case of the posture (0), the rear end 23 of the upper revolving unit 20 is located in the front and rear part 10a of the lower traveling unit 10.

As shown in FIG. 2, when the upper revolving unit 20 is in a laterally oriented posture (ie, in a direction perpendicular to the traveling direction of the lower traveling unit 10), the rear end 23 of the upper revolving unit 20 is in a lower position. It protrudes outside from the left and right side portions 10b of the traveling body 10.

The overhang amount L of the rear end 23 of the upper revolving unit 20 is about the distance between the lower traveling unit 10 and the obstacle that the lower traveling unit 10 can travel along the obstacle without interfering with the obstacle. Is the size of For example, at least 250
mm to at most 450 mm. Here, the range of at least 250 mm to at most 450 mm is set so that a person who performs inspection and maintenance around the revolving work vehicle can freely walk around at the time of start-up inspection or failure inspection when the vehicle is stopped. In order to form an interval between the lower traveling body 10 and the obstacle, a person can pass sideways.

As described above, since the distance from the turning center 25 of the upper turning body 20 to the rear end 23 is larger than that of the conventional ultra-small turning type working vehicle, the conventional ultra-small turning type working vehicle is provided. Excavation power greater than that of a work vehicle can be obtained.

The above-mentioned overhang amount L is the distance between the lower traveling body and the obstacle at which the lower traveling body can travel along the obstacle without interfering with the obstacle. It can work in a narrow place like a work vehicle.

In particular, the overhang L is at least 250 m
When the range is at most 450 mm from m, a gap is formed between the lower traveling body 10 and the obstacle such that a person can pass sideways, so that the turning type work vehicle stops when working in a narrow place. The worker can walk freely around the turning type work vehicle at the time of start-up inspection and failure inspection etc.
Inspection and maintenance can be performed easily.

The overhang amount L is the distance between the left and right side portions 10b of the undercarriage 10 (ie, the entire width of the undercarriage 10).
H is within 10%. Thereby, the upper revolving superstructure 20 is
The left side 10 of the undercarriage 10 when the vehicle is turned 360 degrees
b, the total amount of overhangs from the right side portion 10b is within a range of 120% of the entire width H of the lower traveling body 10.

As described above, the undercarriage 10
The maximum overhang amount L of a large turning work vehicle having a large overall width H is large, and the maximum overhang amount L of a small turning work vehicle having a small overall width H of the undercarriage 10 is small. The value corresponds to the size of the vehicle.

Therefore, the turning center 2 of the upper turning body 20
The distance from 5 to the rear end 23, that is, the size of the upper swing body 20 can be a size corresponding to the size of the upper swing type vehicle, and the upper swing body 20 includes an engine, a fuel tank, a hydraulic oil tank, and the like. The space for installing can be secured.
That is, as the size of the upper turning type vehicle increases, the size of the engine, the fuel tank, the hydraulic oil tank, and the like also increase. Therefore, if the size of the upper turning structure 20 can be made to correspond to the size of the upper turning type vehicle as described above, the engine, Space for installing fuel tanks, hydraulic oil tanks, etc. can be secured.

Next, the specific shape of the upper swing body 20 will be described. As shown in FIG. 3, a driver's cab 40 is attached to one of the left and right sides near the front of the upper frame 21. An operation valve 41 and an oil storage tank 42 such as a fuel tank or a working oil tank are attached to the left and right sides on the front side of the upper frame 21. The operation valve 41 is surrounded by a first cover 43 and the oil storage tank 42.
Are surrounded by a second cover 44. First and second brackets 45 and 46 are provided at the left and right intermediate portions of the upper frame 21.
The boom 31 is attached to the first bracket 45 so as to be vertically swingable with a pin. Second bracket 4
A boom cylinder 34 is attached to 6 so as to be vertically swingable with a pin.

A counterweight 22 is mounted near the rear end of the upper frame 21. The counterweight 22 in the upper frame 21 and the second cover 4
4. The portion between the operator's cab 40 and the cab 40 serves as an equipment mounting portion 47.

The rear end face 48 of the counterweight 22 has an arc shape. The front end surface of the counterweight 22 has a shape in which the left and right center portions are recessed toward the rear end surface 48 except for left and right side portions, and has left and right front end surfaces 49 and left and right center concave portions 50. The left and right front end surfaces 49 are the second cover 44,
The portion facing the driver's cab 40 and facing the left and right central concave portions 50 is the above-described device mounting portion 47. That is, the counterweights 22 are provided on the rear part and the left and right sides of the equipment mounting part 47.
Are arranged.

As described above, the equipment mounting portion 47
The left and right central portions protrude greatly rearward, the left and right side portions slightly protrude rearward, and the left and right central portions are longer in the front-rear direction, and the left and right side portions are shorter in the front-rear direction.

An engine 51 is mounted on the left and right central portions of the equipment mounting portion 47, a hydraulic pump 52 is disposed on one left and right side, and a cooling fan 53 and a radiator 5 are mounted on the other left and right side.
4. An oil cooler 55 is provided. The engine 5
1 is surrounded by a third cover 56, and the hydraulic pump 52 is
Of the cooling fan 53 and the radiator 5
4. The oil cooler 55 is surrounded by a fifth cover 58. The rear end faces of the third, fourth, and fifth covers 56, 57, and 58 approach the rear end portions of the engine 51, the oil hydraulic pump 52, the cooling fan 53, the radiator 54, and the oil cooler 55, and the rear end faces are counters. It has substantially the same shape as the left and right central concave portions 50 of the weight 22 and is close to them.

As described above, devices such as the engine 51, the hydraulic pump 52, the cooling fan 53, the radiator 54, and the oil cooler 55 are neatly and compactly mounted near the rear portion of the upper frame 21. Since counter weights 22 are attached to both left and right sides,
The maintainability of the equipment is improved.

The counter weight 22 is provided on the upper frame 21.
Is disposed at a portion other than each device in the rear part of the counterweight 22 without increasing the distance from the rear end of the counterweight 22 (the rear end 23 of the upper revolving unit 20) to the turning center 25. The capacity can be increased, and the counterweight 22 becomes heavy.

As described above, various devices are provided,
By forming the counterweight 22 in the above-described shape, the space of the upper swing body 20 can be effectively used and various devices can be installed.

As shown in FIG. 4, the counterweight 22 has a mounting projection 60 near the lower portion of the left and right central recess 50.
Is provided, and this mounting projection 60 is attached to the upper frame 2.
The first mounting portion 61 is mounted on the mounting portion 61, and a bolt 62 is screwed into the mounting projection 60 from below the upper frame 21 through the mounting portion 61.

The counterweight 22 is made of cast iron. The counterweight 22 may be made of concrete. Since the specific gravity of concrete is smaller than the specific gravity of cast iron, in the case of a concrete counterweight, the shape of the front end face is the same, and the front end face to the rear end face 4
The length up to 8 is increased as shown by the imaginary line in FIG. 4 to increase the volume. This makes the total weight of the concrete counterweight equal to the total weight of the cast iron counterweight.

As shown in FIG. 5, when the counterweight 22 is made of concrete, the rear end face 23 of the upper revolving unit 20 is positioned at the front and rear surfaces 10a of the lower traveling unit 10 when the upper revolving unit 20 is oriented in the front-rear direction. Settles in. As shown in FIG. 6, when the upper revolving structure 20 is in the horizontal orientation, the left and right side portions 10 of the lower traveling structure 10 on the rear end surface 23 of the upper revolving structure 20.
Although the overhang amount L from b becomes large, it does not exceed the above-mentioned range.

[Brief description of the drawings]

FIG. 1 is a front view of a posture in which an upper revolving unit faces in a front-rear direction.

FIG. 2 is a front view of the upper revolving structure in a horizontal position.

FIG. 3 is a plan view of the upper swing body.

FIG. 4 is an exploded perspective view of an upper frame and a counterweight.

FIG. 5 is a front view of a posture in which an upper swing body with a counterweight made of concrete faces in the front-rear direction.

FIG. 6 is a front view of the upper revolving structure in a state in which a counterweight made of concrete is attached, in a horizontal position.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Lower traveling body 10a ... Front and rear part 10b ... Left and right side part 20 ... Upper revolving body 21 ... Upper frame 22 ... Counter weight 23 ... Rear end part 30 ... Work machine 40 ... Operating room 48 ... Rear end face 49 ... Left and right both front end face Reference numeral 50: left and right central recess 51: engine 52, hydraulic pump 53, cooling fan 54, radiator 55, oil cooler 60, mounting projection 61, mounting part 62, bolt.

Claims (5)

[Claims] An undercarriage (10), an undercarriage (20) pivotally mounted on the undercarriage (10),
In a revolving work vehicle provided with a working machine (30) mounted forward on the upper revolving body (20), when the upper revolving body (20) is in a posture facing the front-rear direction,
The rear end portion (23) of the upper revolving structure (20) fits in the front and rear portions (10a) of the lower traveling structure (10), and when the upper revolving structure (20) is in the sideways posture, it is located behind the upper revolving structure (20). The end portion (23) is provided on the left and right side portions (10) of the undercarriage (10).
b) The overhanging work is characterized in that the overhang is approximately the distance between the lower traveling body (10) and the obstacle that can travel along the obstacle without interfering with the obstacle. vehicle. 2. The revolving work vehicle according to claim 1, wherein the amount of overhang is within a range of 10% or less of the entire width of the undercarriage (10). 3. The overhang amount is at least 250 mm.
2. The swiveling work vehicle according to claim 1, wherein the range is at most 450 mm. 4. An upper revolving unit (20) includes an upper frame (2).
1) The counterweight (22) is attached to the rear part, the rear end of the counterweight (22) becomes the rear end 23 of the upper revolving unit (20), and the counterweight (22) is circular. Rear end face (4
8) and left and right front end faces (49), left and right central recesses (5
0), a device is mounted at a position facing the left and right central recesses (50) near the rear of the upper frame (21), and a counterweight (22) is provided from the rear of the device to the left and right sides. The turning type work vehicle according to claim 1, wherein the turning work vehicle is disposed. 5. A counterweight (22) made of cast iron and a counterweight (22) made of concrete, and both counterweights (22) have the same front end surface shape and the same mounting shape to the upper frame (21). The turning work vehicle according to claim 4, wherein the rear end surface (48) of the concrete counterweight (22) is closer to the rear than the rear end surface (48) of the cast iron counterweight (22).