JP2000144811A - Turning type construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain similar work performance and livability to those of a standard machine, set a turning radius small as a small back turning, enlarge the capacity of a fuel tank, and reduce noise in a cab. SOLUTION: An upper revolving body 2 has a cab 4, a building cover 5 to partition a prime mover chamber, a counter weight 6, a working fluid tank 36, a main fuel tank 37, an auxiliary tank 38, etc., on a turning frame 3, and the whole body of these is contained in a suppositional circle 10 of a turning radius R2. The auxiliary tank 38 is positioned between the cab 4 and the building cover 5 to be installed on the turning frame 3 for increasing the total tank capacity including the main fuel tank 37. A fuel supply interval can thus be extended to about two days, thereby a similar fuel supply interval to that of a standard machine can be secured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swing type construction machine such as a hydraulic shovel which is suitably used for excavating earth and sand, for example, and more particularly, to a swing type in which the swing radius of an upper swing body is reduced. Related to construction machinery.

[0002]

2. Description of the Related Art In general, a revolving construction machine is a hydraulic excavator having an upper revolving structure rotatably provided on a lower traveling structure and a working device such as a shovel or a crane provided at a front portion of the upper revolving structure. , Hydraulic cranes and the like are known.

[0003] In this type of conventional hydraulic excavator, for example, there is a model called a medium-sized standard machine. In this standard machine, there is a margin in the size of the upper revolving unit, and the standard excavator is mounted on a revolving frame. A cab, a fuel tank, a hydraulic oil tank, a building cover that defines a motor room, and the like can be arranged with a relatively large space.

[0004] Thus, in a standard hydraulic excavator,
The fuel tank can be installed on the revolving frame with a large capacity, and there is an advantage that a single fuel tank can sufficiently secure the fuel capacity consumed in a normal excavation operation or the like. Further, since the prime mover can be arranged with a sufficient space in the prime mover room of the building cover, the operating noise of the prime mover is not transmitted as a loud noise to the cab side, so that the livability in the cab can be improved.

[0005]

By the way, in the above-described conventional hydraulic excavator of the standard machine, since the turning radius of the upper revolving unit is determined by, for example, the rear side of the counterweight, the operator in the cab needs to operate the upper revolving unit. It is necessary to confirm that the counterweight behind the cab does not come into contact with obstacles, etc. when turning the cab. There is a problem that the burden increases.

Therefore, as a recent trend, a so-called "small back swing type" hydraulic excavator that has a reduced turning radius while maintaining the same work performance and comfortability as a standard machine has attracted attention. In this small backward swing hydraulic excavator,
The rear surface of the counterweight is accommodated in a circle having a turning radius smaller than half the total length of the lower traveling body so that the rear surface of the counterweight does not protrude backward from the lower traveling body.

For this reason, in a small-swing-back hydraulic excavator, the length of the turning frame (dimensions in the front and rear directions) is shortened, and the installation space for a motor and a fuel tank provided on the turning frame is reduced. ing.

However, in the case of a small rear swing hydraulic excavator, the installation space for the prime mover and the fuel tank on the swivel frame is limited, so that the cab must be installed close to the prime mover. Fuel tanks are required to be as small as possible and have a small tank capacity. For this reason, there is a problem that the refueling operation of the fuel is troublesome at a work site in a mountainous area where a general vehicle cannot travel.

[0009] That is, since there are many steep slopes and the like at work sites such as in the mountains and it is difficult to secure a flat place, it is not possible to perform refueling work using a refueling work vehicle (for example, a tank lorry), and fuel Refueling work often involves a great deal of labor and time. For this reason, it is required to increase the tank capacity of the fuel tank to lengthen the refueling interval.

On the other hand, there is also known a small turning (turning within vehicle width) type excavator in which the turning radius of the upper turning body is reduced to a size within the vehicle width (between the crawler belts of the lower traveling body).
In this case, the capacity of the fuel tank is reduced in order to give priority to turning within the vehicle width, and the cab is brought closer to the building cover that houses the motor.

[0011] Since such a small hydraulic excavator is generally used in a small work site having a small site area in an urban area or the like, a flat place can easily be secured in an urban area or the like. Refueling work using a working vehicle is possible. Further, since a small prime mover is mounted, fuel consumption is relatively small, and noise from the prime mover can be reduced to some extent.

However, a small hydraulic excavator has a small excavating force when excavating soil and the like, and has a lower working performance than a standard machine, so that a large excavating operation is required. However, there is a problem that the in-cab comfort is inferior to the standard model.

Further, there is known a swing type construction machine in which a fuel tank is provided in a boom of a working device in order to increase the tank capacity of the fuel tank (for example, Japanese Utility Model Application Laid-Open No. Heisei 3).
-123728). Further, a revolving construction machine having a configuration in which a fuel tank is provided around a center joint in a round body of a lower traveling body is also known (for example,
Japanese Utility Model Laid-Open Publication No. 4-77647).

However, in these prior arts, since the fuel tank is provided in the boom of the working device or in the round body of the lower traveling body, the workability at the time of assembling is poor and the manufacturing cost is increased. There's a problem.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to maintain the same work performance and livability as a standard machine, to reduce the turning radius as a small backward turning, It is an object of the present invention to provide a revolving construction machine capable of increasing the capacity of a fuel tank and reducing noise in a cab.

[0016]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a lower traveling body, an upper revolving body rotatably mounted on the lower traveling body, and a The upper revolving superstructure comprises a revolving frame, a cab provided on one side in the left and right directions in front of the revolving frame, and
A hydraulic oil tank and a fuel tank provided on the revolving frame located on the other side in the right direction; a building cover provided on the revolving frame located on the rear side of the cab and defining a motor room; The present invention is applied to a revolving construction machine having a counter weight provided on the revolving frame at a position behind the cover.

A feature of the structure adopted in the first aspect of the invention is that the upper revolving structure is configured so that the rear surface side of the counterweight is accommodated in a turning radius smaller than half of the entire length of the lower traveling structure. An auxiliary tank for increasing the tank capacity of the fuel tank is provided between the cab and the building cover.

With this configuration, for example, the turning radius on the counterweight side can be reduced as a hydraulic excavator of a small backward swing type, and the overall tank capacity is increased by supplementing the tank capacity of the fuel tank with the auxiliary tank. It is possible to make the refueling interval as long as the standard machine. By utilizing the sound insulation effect of the fuel contained in the auxiliary tank, it is possible to reduce the transmission of the operation noise of the prime mover in the prime mover room to the cab side.

According to the second aspect of the present invention, the auxiliary tank has a width substantially corresponding to the cab so as to block the transmission of the operating sound from the prime mover housed in the building cover into the cab. I have.

Thus, the rear side of the cab and the building cover can be completely partitioned using the auxiliary tank.
The sound insulation effect of the fuel can be utilized more reliably.

On the other hand, according to the third aspect of the invention, a concave portion for accommodating the auxiliary tank is provided between the rear side of the cab and the front side of the building cover. Thus, the auxiliary tank can be arranged in the concave portion provided on the rear surface side of the cab, and an installation space for the auxiliary tank can be easily secured between the cab and the building cover.

Further, in the invention according to claim 4, the fuel tank is arranged at a position substantially aligned with the auxiliary tank in the left and right directions of the turning frame. This allows the main fuel tank and the auxiliary tank to be kept at almost the same height level even when the vehicle is tilted forward or backward when working on a slope or the like. It is possible to prevent the fuel in the tank from flowing backward from a breathing plug or the like.

According to the fifth aspect of the present invention, a communication pipe is provided between the fuel tank and the auxiliary tank to allow the fuel to flow therethrough, and a supply side for supplying the fuel to the prime mover is provided at the bottom of the fuel tank. A pipe and a return pipe for returning surplus fuel of the fuel supplied to the prime mover to the fuel tank are provided.

As a result, the excess fuel on the prime mover side is returned to the main fuel tank through the return pipe, so that the return fuel, which has become hot on the prime mover side, is not directly returned to the auxiliary tank side. The temperature inside the auxiliary tank can be kept lower than that of the fuel tank, and the heat at this time can be prevented from being transmitted into the cab.

Further, according to the invention of claim 6, a valve means is provided between the fuel tank and the auxiliary tank to allow the flow of fuel when the valve is opened and to shut off the flow of fuel when the valve is closed. As a result, the valve means can be closed until the remaining amount of fuel contained in the main fuel tank becomes small, and the inside of the auxiliary tank can be kept full of fuel. Sound insulation over time.

[0026]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a swing-type construction machine according to an embodiment of the present invention.

FIGS. 1 to 5 show a first embodiment of the present invention. In the figure, reference numeral 1 denotes a lower traveling body of a hydraulic shovel, 2 denotes an upper revolving body mounted on the lower traveling body 1 so as to be pivotable, and the upper revolving body 2 has a revolving frame 3; Is a cab 4 located on the front left side, a building cover 5 located behind the cab 4 and defining a motor room, and a rear side of the revolving frame 3 located behind the building cover 5. Counter weight 6 attached to
And a hydraulic oil tank 36 and a main fuel tank 37 described later.
And an auxiliary tank 38 and the like.

A turning device 8 including a turning motor 7 (see FIG. 2) and the like is provided between the turning frame 3 of the upper turning structure 2 and the lower traveling structure 1. Upper swing body 2 around swing center O shown in FIG.
Is turned. When the radius from the center of rotation O of the upper swing body 2 to the rear surface of the counterweight 6 is defined as a radius R1, the rear surface of the counterweight 6 is curved in an arc shape so as to be accommodated in an imaginary circle 9 having a radius R1. It is formed.

During the turning operation of the upper revolving unit 2, the cab 4 is turned along the imaginary circle 10 having a radius R2 with respect to the turning center O with the handrail 46 described later at the front left corner 4A. You. Then, a radius R2 which is a turning radius of the cab 4 side.
Is larger than the radius R1 of the rear side of the counterweight 6 (R1 <R2).

On the other hand, in the building cover 5, as shown in FIG. 2, a prime mover 11 composed of a diesel engine or the like, a hydraulic pump 12 rotated by the prime mover 11, and a radiator 13 for cooling the prime mover 11 are provided. Air cleaner 1 connected to the intake side of prime mover 11 via intake pipe 14
5 and an exhaust muffler 16 connected to the exhaust side of the prime mover 11 are housed.

Further, in order to install an auxiliary tank 38 to be described later between the cab 4 and the building cover 5, the length of the cab 4 in the front and rear directions is reduced, whereby the cab 4 has a radius R2. In the virtual circle 10 of FIG. In this case, a driver's seat 17 and an operation lever (not shown) are arranged in the cab 4, and a control device such as a controller and an air conditioner (neither is shown) are provided behind the driver's seat 17. Have been. By making these control devices, air conditioners, and the like more compact, the overall length of the cab 4 can be reduced as compared with conventional products.

Reference numeral 18 denotes a working device disposed at the front of the revolving frame 3 so as to be able to move up and down.
9, an arm 20, a bucket 21, and the like. The boom cylinder 22, the arm cylinder 23, and the bucket cylinder 24 are expanded and contracted to excavate soil and the like. The working device 18 has a boom 19
Is pivotally connected to a bracket portion 26 (described later) shown in FIG.
Are disposed at positions offset by a certain dimension with respect to a center line O1-O1 passing through the center line.

The upper revolving unit 2 has a reduced length of the revolving frame 3 for realizing a small backward revolving motion. The cab 4, the building cover 5 and the counterweight 6 disposed on the revolving frame 3 have a revolving radius. Virtual circle 10 of radius R2
Is all contained within.

Further, as shown in FIG. 1, the radius R1 from the turning center O to the rear side of the counterweight 6 is set to a value smaller than a half (L / 2) of the total length L of the lower traveling body 1. Have been. The radius R2 on the cab 4 side, which is the turning radius of the upper turning body 2, is also the above-mentioned dimension (L / 2).
It is smaller (R1 <R2 <L / 2), so that the upper revolving unit 2 does not protrude forward or backward with respect to the lower traveling unit 1.

Next, the structure of the revolving frame 3 will be described with reference to FIG. 3. Reference numeral 25 denotes a center frame serving as a main frame of the revolving frame 3;
Numeral 5 is a position of the turning center O, which is turnably mounted on the lower traveling body 1 via the turning device 8 shown in FIG.
The front side of the center frame 25 is a bracket 26 for the boom 19, and the tail plate 27 is welded to the rear side of the center frame 25.

Reference numerals 28 and 29 denote left and right side frames constituting the revolving frame 3 together with the center frame 25. The side frames 28 and 29 are formed of a high-strength pipe material having a D-shaped cross section. Before the revolving frame 3,
Each extends rearward with a certain length. The side frames 28, 29 are extended beams 30, 31, 32, 33 extending left and right from the center frame 25.
The rear ends of the side frames 28 and 29 are joined to the left and right ends of the tail plate 27, respectively.

Reference numeral 34 denotes an overhanging plate which is located behind the overhanging beam 31 and is provided between the center frame 25 and the side frame 28. The overhanging plate 34 has a tail plate at its lower end as shown in FIG. 27, the building cover 5 is fixed to the side surface thereof using bolts or the like.

35, 35 are the overhang beam 31 and the overhang plate 34
And each of the support brackets 35 is formed as a short bracket.
The rear ends are fixed to the overhanging beam 31 and the overhanging plate 34 using bolts or the like. And each support bracket 35
Is configured to support an auxiliary tank 38 described below from below.

The cab 4 is mounted on the overhanging beams 30, 31 between the front left side of the center frame 25 and the side frame 28 as shown by phantom lines in FIG. The prime mover 11, the radiator 13, and the like are arranged on the tail plate 27 of the center frame 25, and the counterweight 6 is arranged on the rear side as shown in FIG.

Numeral 36 denotes a hydraulic oil tank located between the center frame 25 and the side frame 29 at the rear side of the overhang beam 33. The hydraulic oil tank 36 stores the hydraulic oil contained therein as shown in FIG. And supplies a hydraulic pressure source together with the hydraulic pump 12.

Reference numeral 37 denotes a main fuel tank provided on the revolving frame 3 in front of the hydraulic oil tank 36.
The fuel tank 37 has overhang beams 32, 3 as shown in FIG.
3 between the center frame 25 and the side frame 2
9 is provided. The fuel tank 37 has a reduced length in the front and rear directions because the total length of the turning frame 3 is shortened in order to realize a small backward turning. The tank capacity is, for example, 200 to 300. It is about liter.

An auxiliary tank 38 is provided between the cab 4 and the building cover 5 and is provided on the revolving frame 3 as an auxiliary fuel tank. The auxiliary tank 38 is, as shown in FIGS. The tank is formed as an elongated rectangular parallelepiped tank having a width dimension corresponding to the lateral width of the cab 4, and its lower end is mounted on each support bracket 35 shown in FIG. The auxiliary tank 38 has a tank capacity for accommodating about 100 liters of fuel F as shown in FIG. 4 and for accommodating, for example, about 300 to 400 liters of fuel F in total with the main fuel tank 37. ing.

That is, in the case of a medium-sized excavator of a 20 t (ton) class, the fuel consumption of the prime mover 11 during a normal excavation operation is, for example, about 20 liters / h.
Even if the fuel tank is operated for a long time, only the fuel before and after 160 liters is consumed, so that the fuel supply interval can be extended to about two days, and a fuel supply interval comparable to that of a standard machine can be secured.

As shown in FIG. 5, communication pipes 39, 40 are provided between the main fuel tank 37 and the auxiliary tank 38.
The communication pipes 39 and 40 are formed with a pipe diameter corresponding to the oil supply flow rate described later. When removing the cap 37B from the fuel supply port 37A of the fuel tank 37 and performing refueling work, for example, the fuel is connected between the fuel tank 37 and the auxiliary tank 38 through the communication pipe 3.
9, 40, smoothly flowed in and out through the communication pipe 39,
The fuel flowing through the inside 40 does not have flow path resistance.

For this reason, there is no need to provide a special fuel supply port or the like on the auxiliary tank 38 side.
The fueling operation can be automatically performed also on the auxiliary tank 38 side through 7A. The cap 37B of the fuel tank 37 is provided with a breathing plug (not shown), and the inside of the fuel tank 37 and the auxiliary tank 38 does not have a negative pressure tendency even when the fuel is consumed. The inside is configured to keep almost atmospheric pressure.

Reference numeral 41 denotes a fuel supply pipe connected to the bottom side of the fuel tank 37, and the supply pipe 41
And supplies the fuel in the fuel tank 37 to the prime mover 11.

Reference numeral 42 denotes a fuel return pipe connected to the bottom side of the fuel tank 37. The return pipe 42 is a part of the excess fuel (hereinafter referred to as surplus fuel) of the fuel supplied to the prime mover 11 through the supply pipe 41. Oil) as fuel tank 3
7 is returned. Then, since the surplus oil is once supplied to the prime mover 11 and then returned through the return pipe 42, the surplus oil is returned to the fuel tank 37 in a relatively high temperature state.

Reference numeral 43 denotes a shielding member provided on the inner side surface of the building cover 5. The shielding member 43 is made of, for example, sponge rubber or the like, and surrounds the periphery of the radiator 13 as shown in FIG. Is affixed to the inside surface of the The shielding member 43 shields the machine room in the building cover 5 before and after the radiator 13, and recirculation (recirculation) in which cooling air generated by a cooling fan attached to the radiator 13 circulates upstream of the radiator 13. Function).

Reference numeral 44 denotes a multiple valve device comprising a plurality of directional control valves. The multiple valve device 44 is located on the front side of the main fuel tank 37 as shown in FIG. Has been established. Reference numeral 45 denotes a battery located below the air cleaner 15 and disposed in the building cover 5 as a DC power supply.

Further, reference numeral 46 denotes a handrail for getting on and off the cab 4. The handrail 46 is provided at a corner 4A located on the front left side of the cab 4 as shown in FIGS. 4 protrudes outward by a certain dimension. The handrail 46 is disposed within the imaginary circle 10 having a radius R2 with respect to the turning center O shown in FIG. 2, and when the operator in the cab 4 operates the working device 18, the handrail 46 is within the range of the visible field of view. It is provided in. Therefore, the operator can visually check the front end of the handrail 46 while sitting on the driver's seat 17 in the cab 4.

The small backward swing hydraulic excavator according to the present embodiment has the above-described configuration, and its operation will be described below.

First, the operator of the hydraulic excavator gets in and out of the cab 4 using the handrail 46 and, when seated in the driver's seat 17 in the cab 4, tilts a plurality of operation levers and the like located in front of the operator. By doing so, the upper revolving superstructure 2 is swiveled on the lower traveling superstructure 1 and the work device 18 is moved up and down to perform excavation work such as earth and sand.

At the time of the turning operation of the upper turning body 2,
The corner 4A of the cab 4 is pivoted together with the handrail 46 at the turning center O.
Is turned along a virtual circle 10 having a radius R2. The rear side of the counterweight 6 is turned along the virtual circle 9 having a radius R1 with respect to the center O of rotation, and the radius R1 of the virtual circle 9 is smaller than the radius R2 of the virtual circle 10. .

The radius R1 of the imaginary circle 9 and the radius R2 of the imaginary circle 10 are set so that the upper revolving unit 2 does not protrude forward and backward from the lower traveling unit 1. On the other hand, it is smaller than half the dimension (L / 2) (R1 <R2 <L / 2), thereby realizing a small backward turning.

Therefore, when turning the upper revolving unit 2 at a work site or the like, the operator only needs to confirm that the front handrail 46 does not collide with an obstacle or the like from the inside of the cab 4 and to move the upper revolving unit 2. The turning operation can be performed safely. Then, the operator in the cab 4 does not need to pay special attention to the counterweight 6 on the rear side, so that safety during the turning operation can be easily secured.

The cab 4 and the counterweight 6 of the upper revolving unit 2 do not protrude to the outside of the crawler belt in the front and rear directions of the lower traveling unit 1. In the rear direction, the cab 4 and the counterweight 6 do not contact the obstacle, and the operator does not need to worry about whether the counterweight 6 located behind the cab 4 contacts the obstacle. .

Then, the swing frame 3 of the upper swing body 2
Means that the overall length is made short to realize a small rearward turn, and the length of the fuel tank 37 in the front and rear directions is reduced, and the tank capacity is also smaller than that of a conventional standard machine. Designed small.

However, in the present embodiment, the auxiliary tank 38 is installed on the revolving frame 3 between the cab 4 and the building cover 5, and the width of the auxiliary tank 38 is smaller than that of the cab 4. Since the auxiliary tank 38 is formed as an elongated rectangular parallelepiped tank as shown in FIGS. 1 to 4 so as to correspond to the width, for example, about 100 liters of fuel F can be stored in the auxiliary tank 38 and the main fuel The total tank capacity of the tank 37 is equal to or larger than the standard machine (for example, 300
~ 400 liters).

For this reason, even when excavation work such as earth and sand is performed at a work site in a mountainous area or the like, the fuel supply interval can be extended up to about two days, and a fuel supply interval comparable to a standard machine can be sufficiently secured. It is.

The auxiliary tank 38 has a width substantially corresponding to the cab 4 and partially covers the rear side of the cab 4 between the auxiliary tank 38 and the building cover 5. The auxiliary tank 38 can block the operation noise generated from the prime mover 11, the hydraulic pump 12, the exhaust muffler 16 and the like from being transmitted to the cab 4 side.

In particular, the fuel F stored in the auxiliary tank 38
Since is a liquid, it has a high sound absorbing effect and excellent sound insulation properties, so that noise transmitted from the prime mover 11 into the cab 4 can be reliably reduced, and the livability in the cab 4 can be improved.

In addition, communication pipes 39, 40 permitting fuel to flow between the main fuel tank 37 and the auxiliary tank 38.
Is provided, the supply pipe 41 and the return pipe 42 provided on the bottom side of the fuel tank 37 can smoothly supply the fuel to the prime mover 11 or return the surplus oil. Oil in fuel tank 3
7 can be collected.

Therefore, the surplus oil (return fuel), which has become hot, is not directly returned to the auxiliary tank 38 side, and the temperature inside the auxiliary tank 38 can be kept lower than that of the main fuel tank 37. . Then, it is possible to reliably suppress the heat due to the surplus oil from being transmitted to the cab 4 side, and thus it is possible to enhance the livability in the cab 4.

Therefore, in the small backward swing hydraulic excavator according to the present embodiment, the turning radius can be reduced by using the upper swing body 2 as the small backward swing, and the same work performance and comfort as the standard hydraulic excavator are secured. can do. By connecting the auxiliary tank 38 to the main fuel tank 37, the tank capacity of the fuel tank 37 can be increased to a sufficient capacity, and the noise in the cab 4 can be reduced.
Can be effectively reduced.

Next, FIGS. 6 and 7 show a second embodiment of the present invention. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals. The description is omitted.

However, the feature of this embodiment is that the cab 51 provided on the front left side of the revolving frame 3 is formed to have the same overall length as the conventional product, and the auxiliary tank is provided between the cab 51 and the building cover 5. In order to secure an installation space for 38, the cab 51 is moved to the front side and is arranged on the revolving frame 3.

The cab 51 is provided with a handrail 46 similar to that of the first embodiment at the front left corner 51A.
Is turned along with the handrail 46 along an imaginary circle 52 having a radius R3 with respect to the turning center O.

The radius R, which is the turning radius in this case,
3 is the radius R of the cab 4 described in the first embodiment.
2 (see FIG. 2), and this radius R3 is even larger than the radius R1 (R1 <R2 <R3) of the virtual circle 9 defined by the rear side of the counterweight 6.

Thus, in the present embodiment configured as described above, substantially the same operation and effect as those of the first embodiment can be obtained. In the present embodiment, particularly, the entire length of the cab 51 is increased. As a result, a sufficient space can be secured behind the driver's seat 17, and control equipment such as a controller and air conditioning equipment (both not shown) can be accommodated in the cab 51 with a margin. Also, by moving the cab 51 to the front side and disposing it on the revolving frame 3,
For example, it is possible to widen the field of view when excavating a deep hole or the like.

Next, FIG. 8 shows a third embodiment of the present invention. In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. It shall be.

However, the feature of the present embodiment is that a concave portion 62 is provided on the rear side of the cab 61 disposed on the front left side of the revolving frame 3, and the building cover 5 of the building cover 5 is provided in the concave portion 62. The configuration is such that the auxiliary tank 38 is stored between the front side and the front side.

The cab 61 is formed to have a longer overall length in the same manner as the cab 51 employed in the second embodiment, but the installation position with respect to the revolving frame 3 is not shifted to the front side, and By providing the portion 62, an installation space for the auxiliary tank 38 is secured between the cab 61 and the building cover 5. And the concave portion 6
2 is formed by providing a substantially L-shaped notch from below on the rear side of the cab 61 in accordance with the shape of the auxiliary tank 38.

Thus, in the present embodiment having the above-described structure, substantially the same operation and effect as those in the first embodiment can be obtained. Since the entire length of the cab 61 is increased, the living space in the cab 61 can be widened, and the operator can perform the lever operation or the like with a margin without giving the operator a feeling of oppression.

The auxiliary tank 38 housed in the recess 62 of the cab 61 does not have to be arranged so as to be visible from the outside as shown in FIG. And the auxiliary tank 38 housed in the concave portion 62 may be covered on both the left and right sides. In this case, the auxiliary tank 38 is hidden in the concave portion 62 while the auxiliary tank 38 is hidden behind the cab 61.
8 can be stored.

Next, FIG. 9 shows a fourth embodiment of the present invention. In this embodiment, the same components as those in the second embodiment are denoted by the same reference numerals, and the description thereof will be omitted. It shall be.

However, the feature of the present embodiment is that the main fuel tank 71 is located at a position substantially aligned with the auxiliary tank 38 in the left and right directions of the revolving frame 3 (position of a straight line AA shown in FIG. 9). The hydraulic oil tank 72 is disposed and the fuel tank 71
Is arranged in front of the multiple valve device 44.

Here, the main fuel tank 71 and the auxiliary tank 38 are separated from each other left and right on the revolving frame 3 at the position of the straight line AA shown in FIG.
It is arranged in front of. Therefore, even when the vehicle leans forward or backward when working on a slope, etc., the main fuel tank 71 and the auxiliary tank 38 can be maintained at substantially the same height level, and the auxiliary tank 38 and the fuel tank 71 can be maintained. It is possible to eliminate problems such as repeated outflow and inflow of fuel between the fuel cell and the fuel, resulting in excessive stirring of fuel.

Thus, in the present embodiment having the above-described configuration, substantially the same operation and effect as those of the second embodiment can be obtained. The auxiliary tank 38 is separated from each other in the left and right directions of the revolving frame 3 along the straight line AA shown in FIG. 9 and is disposed at a position substantially coincident in the front and rear directions. Tank 38 when tilting
The flow of fuel between the fuel tank 71 and the fuel tank 71 can be reduced.

That is, the hydraulic excavator can secure sufficient stability even when the front and rear inclinations are about 35 degrees. However, they often continue running or excavating. When the vehicle leans forward or backward in this way, the level of the fuel also tilts in accordance with this, and not only is the fuel agitated excessively, but also, for example, from the breathing plug of the cap provided at the fuel filler port. Problems such as backflow of the fuel in the tank are likely to occur.

However, in the present embodiment, the main fuel tank 71 is disposed on the revolving frame 3 at a position substantially coincident with the auxiliary tank 38 in the front and rear directions.
Even if the vehicle leans forward or backward greatly, it is possible to prevent the fuel from flowing excessively between the main fuel tank 71 and the auxiliary tank 38. For example, the fuel in the tank flows backward from the breathing plug of the cap or the like. Thus, problems such as overflowing to the outside can be satisfactorily prevented.

Next, FIG. 10 shows a fifth embodiment of the present invention. In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. It shall be.

However, the feature of the present embodiment is that a dedicated oil supply port 81A is also provided on the auxiliary tank 81 side.
A is detachably closed by the cap 81B,
A small-diameter communication pipe 82 is provided between the main fuel tank 37 and the auxiliary tank 81 so as to allow fuel to flow between them.

Here, the auxiliary tank 81 is disposed between the cab 4 and the building cover 5 similarly to the auxiliary tank 38 described in the first embodiment to increase the tank capacity of the fuel tank 37. Has become. The communication pipe 82 is connected between the fuel tank 37 and the auxiliary tank 81 at a position close to the bottom surface thereof, and the flow passage area has a size substantially corresponding to the fuel consumption on the prime mover 11 side.

That is, the fuel in the fuel tank 37 is supplied to the prime mover 11 via the supply pipe 41, and the surplus oil is returned to the fuel tank 37 via the return pipe 42.
At this time, the fuel in the fuel tank 37 is
Although the liquid level decreases by the amount of fuel consumed by 1,
The fuel in the auxiliary tank 81 flows into the fuel tank 37 through the communication pipe 82 so as to compensate for the decrease in the liquid level.

When fuel is supplied into the auxiliary tank 81, the cap 81B is removed and the fuel is supplied from the fuel supply port 81A side. At this time, the flow passage area of the communication pipe 82 is smaller than the normal refueling flow rate.
This gives resistance to the fuel flowing from the side toward the main fuel tank 37 side.

For this reason, the fuel tank 37 and the auxiliary tank 8
Numeral 1 denotes that a refueling operation is performed individually from each of the refueling ports 37A and 81A so that a smooth refueling operation can be performed in both the fuel tank 37 and the auxiliary tank 81.

Thus, in the present embodiment configured as described above, substantially the same operation and effects as those of the first embodiment can be obtained. The fuel supply ports 37A and 81A are provided in the auxiliary tank 81, respectively.
Can be reduced, the piping work between the fuel tank 37 and the auxiliary tank 81 can be simplified, and costs can be reduced.

Next, FIG. 11 shows a sixth embodiment of the present invention. In this embodiment, the same components as those in the fifth embodiment are denoted by the same reference numerals, and description thereof will be omitted. It shall be.

However, a feature of this embodiment is that an opening / closing valve 91 as valve means is provided in the middle of the communication pipe 82, and the main fuel tank 37 and the auxiliary tank 81 are provided by the opening / closing valve 91.
And selectively communicate and cut off between them.

Here, the on-off valve 91 is constituted by a solenoid valve or a manually operated valve which can be remotely operated, and allows the fuel to flow between the auxiliary tank 81 and the fuel tank 37 when the valve is opened. Sometimes it shuts off the flow of fuel.

Thus, in the present embodiment having the above-described structure, substantially the same operation and effect as those of the fifth embodiment can be obtained. By setting the on-off valve 91 to the closed state until the remaining amount of the fuel stored in the auxiliary tank 81 is reduced, the fuel in the auxiliary tank 81 can be maintained in a substantially full state. By exhibiting the sound insulation effect, the inside of the cab 4 can be kept in a low noise state for a long time.

Further, by closing the on-off valve 91 even when traveling or working on a slope, the fuel is prevented from flowing through the communication pipe 82 between the main fuel tank 37 and the auxiliary tank 81. Yes, for example, caps 37B, 8
Problems such as the fuel in the tanks 37 and 81 flowing backward from the 1B respirator or the like and overflowing to the outside can be eliminated.

In each of the above embodiments, the cab 4
Auxiliary tank 38 between (51, 61) and building cover 5
Although it has been described that (81) is provided, in the present invention, the auxiliary tank does not necessarily need to be configured as a single tank. For example, the auxiliary tank may be configured by a plurality of tanks stacked on top and bottom. Alternatively, a plurality of tanks may be arranged in the left and right directions.

In each of the above embodiments, the cab 4
Although (51, 61) is provided on the front left side of the turning frame 3, the present invention is not limited to this. For example, a cab is provided on the front right side of the turning frame 3, and the hydraulic oil tank 36 illustrated in FIG. The fuel tank 37, the multiple valve device 44, and the like may be provided on the front left side of the turning frame 3.

Further, in each of the above embodiments, the description has been made by taking the hydraulic excavator as an example. However, the present invention is not limited to this, and is applied to, for example, a dredger having an upper revolving structure mounted on a hull. Alternatively, the present invention may be applied to a revolving construction machine having an upper revolving unit such as a self-propelled crane.

[0096]

As described in detail above, according to the first aspect of the present invention, the rear side of the counterweight is accommodated within a turning radius smaller than half of the entire length of the lower traveling body, and the cab and the building cover are connected to each other. In between, an auxiliary tank for increasing the tank capacity of the fuel tank is provided, so that the turning radius on the counterweight side can be reduced, and for example, a small backward turning construction machine can be provided, By supplementing the tank capacity of the fuel tank with the auxiliary tank, the overall tank capacity can be increased, and the refueling interval can be made longer than that of the standard machine.

By utilizing the sound insulation effect of the fuel contained in the auxiliary tank, the transmission of the operating noise from the prime mover in the building cover to the cab side can be satisfactorily blocked. Therefore, while maintaining the same work performance and livability as the standard machine, the turning radius can be reduced as a small backward turning, the fuel tank capacity can be increased and the refueling interval can be extended, and the noise level in the cab can be ensured. Can be reduced.

In the second aspect of the present invention, since the auxiliary tank is formed with a width substantially corresponding to the cab, the auxiliary tank is used to completely separate the rear side of the cab from the building cover. Therefore, noise transmitted to the cab side, including the sound insulation effect of the fuel, can be more reliably cut off.

On the other hand, according to the third aspect of the present invention, the concave portion is provided on the rear side of the cab, and the auxiliary tank is stored between the concave portion and the front side of the building cover.
For example, an installation space for the auxiliary tank can be secured between the cab and the building cover without protruding the cab to the front side of the turning frame, and the living space in the cab can be widened.

According to the fourth aspect of the present invention, since the fuel tank is disposed at a position substantially in line with the auxiliary tank in the left and right directions of the turning frame, the vehicle moves forward when working on a slope or the like. Even if the fuel tank is tilted backward, the main fuel tank and the auxiliary tank can always be kept at substantially the same height level, and the fuel level can be prevented from greatly changing. Thus, it is possible to solve the problem that the fuel in the tank flows backward and overflows from, for example, the breathing plug of the cap provided at the filler port.

According to the fifth aspect of the present invention, the fuel tank and the auxiliary tank are connected by a communication pipe, and a supply pipe and a return pipe are provided on the bottom side of the fuel tank. Surplus fuel can be returned to the main fuel tank by return piping,
The return fuel, which has become hot on the prime mover side, can be prevented from returning directly to the auxiliary tank side, and the temperature inside the auxiliary tank can be kept lower than that of the main fuel tank. The temperature can be prevented from rising due to heat or the like.

Further, in the invention according to the sixth aspect, since the valve means is provided between the fuel tank and the auxiliary tank, the valve means is provided until the remaining fuel amount stored in the main fuel tank becomes small. And the inside of the auxiliary tank can be kept full of fuel. Therefore, the inside of the cab can be sound-insulated for a long time by the fuel in the auxiliary tank, and the fuel is prevented from being greatly agitated between the main fuel tank and the auxiliary tank. Can be reliably prevented from overflowing.

[Brief description of the drawings]

FIG. 1 is a front view showing a hydraulic excavator according to a first embodiment of the present invention.

FIG. 2 is an enlarged plan view showing an upper swing body in FIG. 1;

FIG. 3 is a plan view showing a structure of a turning frame in a state where a cab, an engine, and the like in FIG. 2 are removed.

FIG. 4 shows an installation structure of an auxiliary tank, indicated by an arrow IV- in FIG.
It is sectional drawing seen from the IV direction.

FIG. 5 is an explanatory diagram showing a connection relationship between a main fuel tank and an auxiliary tank.

FIG. 6 is a front view showing a hydraulic excavator according to a second embodiment of the present invention.

FIG. 7 is an enlarged plan view showing the upper swing body in FIG. 6;

FIG. 8 is an enlarged front view showing a main part of a hydraulic shovel according to a third embodiment of the present invention.

FIG. 9 is an enlarged plan view showing an upper swing body of a hydraulic shovel according to a fourth embodiment of the present invention.

FIG. 10 is an explanatory diagram showing a connection relationship between a fuel tank and an auxiliary tank of a hydraulic shovel according to a fifth embodiment of the present invention.

FIG. 11 is an explanatory diagram showing a connection relationship between a fuel tank and an auxiliary tank of a hydraulic shovel according to a sixth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Upper revolving structure 3 Revolving frame 4, 51, 61 Cab 5 Building cover 6 Counter weight 11 Prime mover 12 Hydraulic pump 18 Working device 36, 72 Hydraulic oil tank 37, 71 Fuel tank 38, 81 Auxiliary tank 39, 40 , 82 Communication pipe 41 Supply pipe 42 Return pipe 62 Concave recess 91 Opening / closing valve (valve means) L Overall length of lower traveling body R1, R2, R3 Radius (turn radius) O Center of turning

Claims (6)

[Claims] 1. An undercarriage, an upper revolving body rotatably mounted on the lower traveling body, and a working device provided at a front portion of the upper revolving body so as to be capable of elevating and lowering, The revolving structure includes a revolving frame, a cab provided on one side in the left and right directions located on the front side of the revolving frame, and an operation provided on the revolving frame located on the other side in the left and right directions. An oil tank and a fuel tank, a building cover provided on the turning frame located behind the cab and defining a motor room, and a counterweight provided on the turning frame behind the building cover. In the revolving construction machine comprising: the upper revolving unit is configured to receive the rear side of the counterweight within a revolving radius smaller than half of the entire length of the lower traveling unit. In between, said Pivoting construction machine is characterized in that a configuration in which the auxiliary tank to increase the tank capacity of the charge tank. 2. The structure according to claim 1, wherein the auxiliary tank has a width substantially corresponding to the cab so as to block an operation sound from a motor housed in the building cover from being transmitted into the cab. The swivel-type construction machine according to 1. 3. The swiveling construction according to claim 1, wherein a recessed portion for accommodating the auxiliary tank is provided between the rear side of the cab and a front side of the building cover. machine. 4. The revolving construction machine according to claim 1, wherein the fuel tank is arranged at a position substantially aligned with the auxiliary tank in left and right directions of the revolving frame. 5. A communication pipe for allowing fuel to flow between the fuel tank and the auxiliary tank, and a supply pipe for supplying fuel to the prime mover at a bottom side of the fuel tank; The revolving construction machine according to claim 1, further comprising a return pipe for returning surplus fuel of the fuel supplied to the fuel tank to the fuel tank. 6. A valve means is provided between the fuel tank and the auxiliary tank for permitting fuel flow when the valve is opened and shutting off fuel flow when the valve is closed. 6. The swiveling construction machine according to 5.