JPH08246489A - Hydraulic working machine - Google Patents

Abstract

PURPOSE: To ensure a sufficient mounting region for parts by maintaining high workability. CONSTITUTION: A driver's seat 3 is mounted on the front on one side of a revolving body 1 having a rear half part being revolvable within a car width and parts for an internal combustion engine 17, a direction switching valve 18, a working oil tank 19, and a fuel tank 20 are mounted on the other side and the rear part of the driver's seat 3. A boom 5 is arranged at the front of the revolving body 1 through a bracket 12 and a support shaft 11. The oscillation angle of the boom 5 is set to a given angle lower than 180 deg.. A fluctuation range (x) on the other side is reduced to a value lower than that of the driver's seat side. A protrusion part 4b is arranged in the other region than the oscillation region (x) of the boom 5.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art For example, a hydraulic excavator is provided with a revolving structure provided on a traveling part so as to be freely rotatable, and a driver's cab on which a worker rides is provided on one side of a front part of the revolving structure. It is generally known that the revolving structure is equipped with an internal combustion engine as a drive source such as a hydraulic motor at the rear part thereof. The revolving structure further includes a directional control valve for operating various hydraulic cylinders such as a boom cylinder and a revolving hydraulic motor according to the operation of an operating lever provided in the operator's cab, a tank for hydraulic oil, and an internal combustion engine. The fuel tank of is installed.

Conventionally, in a hydraulic working machine of this type, when the revolving structure revolves, the rear part of the revolving structure protrudes from the vehicle width, which may make it difficult to work in a narrow space.

On the other hand, there is known a hydraulic working machine in which the rear half of the swing structure swings within the vehicle width. In this type of hydraulic working machine, the rear half of the swing structure is substantially contained within a circle having the vehicle width as the diameter, and the rear part of the swing structure does not extend beyond the vehicle width even when the swing structure swings. Therefore, the work can be easily performed even in a narrow place.

However, since the latter half of the revolving structure has to be accommodated in a circle having a vehicle width as a diameter, the mounting area of each component on the latter half is reduced. In particular, in a small hydraulic excavator or the like, which is often used in a narrow space, it is difficult to mount all existing tanks, engines, switching valves and the like.

Therefore, it is conceivable to reduce the size of the fuel tank whose shape is relatively easy to be mounted and to expand the mounting area of each component. However, if the size of the fuel tank is reduced, its capacity is reduced. Therefore, there is an inconvenience that the number of refueling increases and the work efficiency decreases. Further, the shape of the directional control valve, the hydraulic oil tank, the internal combustion engine, etc. is limited in terms of performance, and if these shapes are changed for downsizing, etc., they will have special specifications, resulting in a huge cost increase. There is.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a hydraulic working machine in which such inconvenience is eliminated and a high workability can be maintained and a mounting area for components can be sufficiently secured. .

[0008]

In order to achieve the above object, the present invention has a driver's seat mounted on the front part of one side, and an internal combustion engine, a directional control valve, and an actuation valve on the other side and substantially the rear part of the driver's seat. A hydraulic working machine including a revolving structure on which various components such as an oil tank and a fuel tank for an internal combustion engine are mounted, and a boom swinging in the left-right direction via a support shaft supported by a bracket projecting forward of the revolving structure. The swing angle of the boom is 180 °
With a smaller predetermined angle, the swing range is set to be smaller on the other side than the range on the driver's seat side from the reference line extending in the front-rear direction of the revolving structure through the support shaft, and on the other side of the driver's seat. The present invention is characterized in that a protruding portion that protrudes is provided in a region other than the swing range of the boom located.

Further, the projecting portion is provided so as to project in the vicinity thereof along the boom located at one end of the swing range in which one side is located on the other side of the driver's seat.

Further, it is preferable that a base end portion of the boom is pivotally supported on the other side of the driver's seat with a predetermined distance from a center line extending in the front-rear direction of the revolving structure.

According to one aspect of the present invention, the swing angle of the boom is 140 °, and the swing angle passes through a reference line extending in the front-rear direction of the revolving structure through the support shaft. The driver's seat side is distributed to 85 ° to 90 °, and the other side is distributed to 55 ° to 50 °.

In the present invention, the fuel tank can be mounted on the protrusion. Further, the projecting portion may be provided with a boarding / alighting portion extending from the outer peripheral edge of the revolving structure toward the driver's seat. Further, the fuel tank can be installed at a position below the boarding / alighting section, and a swing cylinder for driving the swing of the boom can be installed at a position below the driver's seat.

In the present invention, it is preferable that the boom is pivotally supported by a bracket fixed to the protruding portion via a support shaft.

Further, it is preferable that at least the rear half portion of the revolving structure is formed so as to be revolvable within the vehicle width.

[0015]

In a hydraulic working machine such as a small hydraulic excavator for working in a narrow place, it is necessary for the gutter excavation work to have a boom swingable in the left-right direction in front of the revolving structure. . However, in the case where the driver's seat is mounted on the front part on one side of the revolving structure, the swinging range of the boom on the other side of the driver's seat is a range in which visibility during work is poor and it is difficult for the driver to work. Become. Therefore, the present inventor has found that it is sufficient to swing the boom greatly from the position of the driver's seat in the range where the driver can work most easily.

That is, according to the present invention, the swing range of the boom is set so that the range on the other side is smaller than the range on the driver seat side from the reference line extending in the front-rear direction of the revolving structure through the support shaft. A part of the range on the other side of the driver's seat has been deleted as a range that is difficult for the driver to work in the swing range. The protrusion is provided in a region other than the swing range of the boom located on the other side of the driver's seat. As a result, a part of the mounting area of each component can be secured on the protrusion, and the mounting area can be expanded.

By providing the projecting portion in the vicinity thereof along the boom located at one end of the swing range located on the other side of the driver's seat, the mounting area can be further increased. .

Further, the boom itself is pivotally supported on the other side of the driver's seat at a predetermined distance from the center line extending in the front-rear direction of the revolving structure, so that the boom itself can be seen by the driver. Prevent from interfering with.

Further, by mounting the fuel tank on the projecting portion, a fuel tank having a high degree of freedom in shape can be made to correspond to the shape of the projecting portion, and the revolving structure can be achieved without reducing the capacity of the fuel tank. It becomes possible to mount each part on. Further, the projecting portion is provided with a boarding / alighting portion extending from the outer peripheral edge of the revolving structure toward the driver's seat. Area can be set. And further,
When a space is formed below the boarding / alighting section on the revolving structure when the boarding / alighting section is provided, the fuel tank is installed so as to intervene in the space to effectively cover the projecting section. It becomes possible to use. In addition, the swing cylinder for driving the swing of the boom can be provided at the lower position of the driver's seat by installing the boarding / alighting section and the fuel tank on the protruding section and expanding the mounting area of each mounted component. The boom can be easily swung in the entire swing range of the boom.

Further, by fixing the bracket of the boom to the projecting portion, the positions of the support shaft and the fixing portion of the bracket can be brought close to each other, and the fixing strength of the bracket is improved.

As described above, by expanding the mounting area of each mounting component by the protrusion, even if all the existing tanks, engines, switching valves, etc. are mounted, the latter half of the revolving structure has the vehicle width as the diameter. Since it is possible to put it in the circle
It becomes easy to form a revolving superstructure in which the rear half can turn within the vehicle width in a compact manner.

[0022]

Embodiments of the present invention will be described with reference to FIGS. FIG. 1 is a side view of a hydraulic working machine according to this embodiment, and FIG.
1 is an explanatory plan view of the swing body of the working machine of FIG. 1, FIG. 3 is another side view of the working machine of FIG. 1, and FIGS. 4 and 5 are various types mounted on the swinging body of the hydraulic working machine of another embodiment. It is a schematic plan view showing a layout configuration of the device.

Referring to FIG. 1, the hydraulic working machine according to the present embodiment is a small hydraulic excavator configured to work in a narrow space, and 1 is a swivel provided on a traveling portion 2 so as to be freely rotatable. It is the body. The revolving unit 1 is equipped with a driver's seat 3 on the left side of the front part thereof, and is provided with a housing 4 surrounding the right side and the rear part of the lower part of the driver's seat 3 to accommodate various devices described later. .

Further, a boom 5, an arm 6 and a bucket 7 are sequentially extended from the front part of the revolving structure 1, and a boom cylinder 8, an arm cylinder 9 and a bucket cylinder 1 are respectively provided.
It can be swung up and down by 0. In this case, the boom 5 is pivotally supported by the support shaft 11 so as to be swingable left and right with respect to the revolving structure 1 with a support shaft 11 provided at a front portion of the revolving structure 1 as a fulcrum. In addition, in FIG. 1, as a constituent of the driver's seat 3, 3a is a canopy, 3b is a handrail,
Reference numeral 3c denotes a seat, 3d denotes an operation lever, and 2a denotes a crawler and 2b denotes a dozer as a constituent of the traveling unit 2.

Referring to FIG. 2, the shape of the housing 4 of the revolving structure 1 is substantially within a circle having a vehicle width as a diameter in a plan view. In particular, the shape of the rear half of the housing 4 is completely contained within a circle having the vehicle width as a diameter, and even if the revolving structure 1 swings, the rear half of the housing 4 does not protrude from the vehicle width.

Further, the front portion of the housing 4 is formed with a flat portion 4a immediately in front of the driver's seat 3 and a protruding portion 4b protruding from the flat portion 4a to the front right side of the driver's seat 3. There is. A bracket 12 that supports the boom 5 via a support shaft 11 is fixedly provided at a boundary portion between the flat portion 4a and the protruding portion 4b and a portion in the vicinity thereof.

The boom 5 is pivotally supported by a support shaft 11 via a mounting member 13, and the support shaft 11 is supported by the tip of the bracket 12. The support shaft 11 is supported by the bracket 12 at a position offset from the center line a extending in the front-rear direction of the revolving structure 1 at a predetermined distance to the other side of the driver's seat.

The bracket 12 is provided so as to project in front of the revolving structure 1. However, since the position of the support shaft 11 and the fixed portion of the bracket 12 are close to each other by the projecting portion 4b, the strength of the bracket 12 is improved. ing.

Below the driver's seat 3 of the revolving superstructure 1, a swing cylinder 14 for swinging the boom 5 left and right around the support shaft 11 with respect to the revolving superstructure 1 extends substantially in the front-rear direction. Is provided. A rear end of the swing cylinder 14 is pivotally supported by the revolving structure 1, and a tip end portion of a piston rod 21 extending in a forward direction of the revolving structure 1 is extendably attached to the mounting member 22. As a result, by expanding and contracting the piston rod 15 of the swing cylinder 14, the boom 5 is supported by the support shaft 1 while the cylinder 14 swings.
1 is used as a fulcrum to swing to the left and right with respect to the revolving structure 1.

Swing range x of boom 5 (swing angle 140 °)
Is a part of the conventional hydraulic excavator having a poor visibility, that is, a part of the right side y (about 55 °) of the driver's seat 3 in the figure is partially excluded to facilitate the work from the position parallel to the flat part 4a. It is set to the right front side of the driver's seat 3 which is not lowered.

More specifically, the boom 5 is provided so as to swing in order to position the bucket 7 in the gutter excavation work outside the vehicle width, so that, for example, when the gutter excavation work is performed, the boom 5 cannot be ridden. When excavating the side groove along the obstacle such as a fence in the vehicle length direction, the swing angle is determined so that the boom 5 can be positioned on one side of the vehicle body in a state parallel to the vehicle length direction. .

Although not shown, in actuality, the swing body 1 is swung to the right and at the same time the boom 5 is swung to the left, or the swing body 1 is swung to the left and at the same time the boom 5 is swung.
Is swung to the right. by this,
It is necessary to make it possible to move the bucket 7 in the vehicle width direction while keeping the boom 5 parallel to the vehicle length direction, and to appropriately determine the position of the bucket 7 in the gutter excavation work.

With the boom 5 parallel to the vehicle length direction,
When the bucket 7 is moved in the vehicle width direction, the swing angle of the boom 5 is related to the distance from the swing axis of the swing structure 1 to the axis of the support shaft 11. That is, if the swing angle of the boom 5 is large, the distance from the swing axis of the swing structure 1 to the axis of the support shaft 11 can be small, and a relatively large load is applied to the boom 5. Can be provided close to the turning axis of the revolving structure 1, so that the stability of the revolving structure 1 can be improved.

In this embodiment, since the swing angle of the boom 5 is relatively large at 140 °, the boom 5 can be pivotally supported at a position where high stability can be obtained. Then, the swing angle of 140 ° of the boom 5 is set to 90 ° on the driver's seat 3 side through the reference line b extending in the front-rear direction of the revolving structure through the support shaft 11.
By allocating to the other side of 50 °, the swing range of the boom 5 is widened at the position where the driver can see it most easily, so that the workability can be improved.

Further, as described above, the support shaft 11 of the boom 5 is provided.
Is supported by the bracket 12 at a position biased to the other side of the driver's seat, so that the boom 5 itself does not obstruct the driver's view. Regarding the distribution of the swing angle of 140 ° of the boom 5, it may be distributed so that the swing range of the boom 5 can be widened at a position where the driver can see it most easily. Driver's seat 3 side 85 °, other side 5
It may be 5 °.

Since the swing range x of the boom 5 is defined as described above, a position not interfering with the boom 5 is formed in front of the driver's seat 3 on the right side, and the driver's seat 3 is placed at this position. The shape of the housing 4 in plan view is provided by providing the protruding portion 4b that protrudes to the maximum extent along the boom 5 located at the right end z of the swing range x located on the other side and in a region that does not interfere with the boom 5. Can be relatively large.

Therefore, in order to allow the driver's seat 3 to get in and out of the protruding portion 4b from the right side of the vehicle body, from the outer peripheral edge of the revolving structure 1 to the driver's seat 3 along one side of the protruding portion 4b.
A walk-through boarding / alighting section 16 is provided extending toward.

Various devices such as an internal combustion engine 17, a directional control valve 18, a hydraulic oil tank 19 and a fuel tank 20 are mounted in the housing 4 of the revolving structure 1 including the protrusion 4b.

The internal combustion engine 17 is provided rearward of the driver's seat 3 in the rear part of the revolving structure 1 in the left-right direction, the cooling fan 17 and the radiator 18 are arranged on the right side thereof, and the internal combustion engine is arranged on the left side thereof. A hydraulic pump 19 driven by 17 is attached.

The direction switching valve 18 is mounted in the housing 4 in the front-rear direction at a position on the right side of the front part of the revolving structure 1 which is located outward. In this case, the direction switching valve 18 is provided close to the cooling fan 17 of the internal combustion engine 17.

The fuel tank 20 and the hydraulic oil tank 19 are
The directional control valve 18 and the driver's seat 3 are arranged in front and rear and are mounted in the housing 4. In this case, the fuel tank 20 is easy to manufacture and has a high degree of freedom in molding. A part of the fuel tank 20 corresponds to the protruding portion 4b as shown in FIG. It is formed in an overhanging shape and is mounted in the housing 4 without reducing its capacity.

By mounting the fuel tank 20 on the projecting portion 4b in the housing 4 in this manner, the hydraulic oil tank 19, the directional control valve 18, the internal combustion engine 17, etc. are not required to have special specifications. The rear half can be easily mounted on the revolving superstructure 1 whose diameter is the width of the vehicle.

Although not shown, in the center of the revolving structure 1 below the driver's seat 3, a revolving hydraulic motor for revolving the revolving structure 1 via a revolving bearing, and a traveling hydraulic motor for the traveling unit 2 are provided. And a swivel joint for supplying hydraulic oil from the revolving structure 1 side.

As described above, in the housing 4 of the revolving structure 1, since the mounting area for various devices is enlarged by the projecting portion 4b, the mounting layout for various devices in the above-described embodiment is not limited to the above. Various layouts can be realized.

For example, in the case of a large-sized hydraulic working machine having a vehicle width larger than that of the hydraulic working machine of the above-described embodiment (see FIG. 3), each of the on-board devices should have a special specification as shown in FIG. It is possible to sufficiently mount the rear half portion on the revolving structure 1 capable of turning within the vehicle width, but by providing the protrusion 4b, the mounting area is expanded, so that the multi-valve is mounted on the protrusion 4b. 21 may be mounted. This type of multi-valve 21 is conventionally mounted in a lower position of the driver's seat 3 (not shown), whereas according to the present invention, the protrusion 4 is provided.
Since it can be mounted on the multi-valve 21, it is not necessary to remove the driver's seat 3 as in the conventional case even when performing an operation or maintenance work on the multi-valve 21.
Maintenance work can be easily performed from the side.

As for other on-board equipment, as shown in FIG. 4, a fuel tank 20 and a hydraulic oil tank 19 are arranged in the front-rear direction, and a directional control valve is provided between both tanks 20 and 19 and the driver's seat 3. 18 is arranged and the internal combustion engine 1
It is similar to the embodiment shown in FIG. 3 that 7 can be provided.

Further, for example, even in the case of a small hydraulic working machine having a vehicle width smaller than that of the hydraulic working machine of the above-described embodiment (see FIG. 3), the mounting area of the projecting portion 4b is secured as shown in FIG. If so, by mounting the direction switching valve 18 below the driver's seat 3, the shape of the revolving structure 1 can be further reduced in size.

As for other mounted equipment, as shown in FIG. 5, the fuel tank 20 and the hydraulic oil tank 19 may be arranged in the front-rear direction, and the internal combustion engine 17 may be arranged in the rear portion of the revolving structure 1. Similar to the embodiment shown in FIG. 3, the fuel tank 20 is formed so as to partially project below the entry / exit portion 16 to maintain the capacity of the fuel tank 20 so that the latter half is within the vehicle width. It can be sufficiently mounted on the swingable revolving structure 1.

In each of the above embodiments, the driver's seat 3
Although it has an exposed structure, it may have a cab.

[0050]

As is apparent from the above description, according to the present invention, the swing angle of the boom is set to a predetermined angle smaller than 180 °, and the swing range of the swing body passes through the support shaft. By setting the range on the other side from the reference line extending in the front-rear direction to be smaller than the range on the driver's seat side, the boom can be swung within the range where the driver can work most easily from the position of the driver's seat. Then, since it is possible to provide a projecting portion that projects in a region other than the swing range of the boom, the mounting region of each component mounted on the revolving structure can be expanded.
Then, even if the revolving structure is accommodated in a circle having a vehicle width as the diameter at the latter half of the revolving structure to perform revolving within the vehicle width, the revolving structure can be equipped with all existing tanks, engines, switching valves and the like.

At this time, the mounting area can be further increased by providing the protruding portion in the vicinity thereof along the boom located at one end of the swinging range having one side on the other side of the driver's seat. it can.

Further, by pivotally supporting the boom on the other side of the driver's seat with a predetermined distance from the center line extending in the front-rear direction of the revolving structure, the driver can support the boom itself. It is possible to work well without obstructing the view.

Further, a fuel tank having a high degree of freedom in shape,
By mounting the parts corresponding to the shape of the projecting portion, each part can be mounted on the revolving structure without reducing the capacity of the fuel tank.

Further, by providing the protrusion,
The projecting portion can be provided with the boarding / alighting portion, and the getting on and off of the driver's seat can be performed not only from one side of the vehicle body but also from the other side.

Furthermore, by installing a fuel tank corresponding to the shape below the boarding / alighting section provided on the projecting section, the projecting section can be effectively utilized.
Moreover, since each mounting component can be mounted on the protruding portion side, the swing cylinder that drives the swing of the boom can be provided at a position below the driver's seat. As a result, the boom can be efficiently swung in the entire swing range of the boom.

Further, by fixing the bracket of the boom to the projecting portion, the positions of the support shaft and the fixing portion of the bracket can be brought close to each other, and the strength of the bracket can be improved.

[Brief description of drawings]

FIG. 1 is a side view of an example (hydraulic excavator) of an embodiment of the present invention.

FIG. 2 is an explanatory plan view of a swing body of the hydraulic excavator of FIG.

FIG. 3 is another side view of the hydraulic excavator of FIG.

FIG. 4 is a schematic plan view showing a layout configuration of various devices mounted on a revolving structure of another embodiment (hydraulic excavator) of the present invention.

FIG. 5 is a schematic plan view showing a layout configuration of various devices mounted on a revolving structure of another embodiment (hydraulic excavator) of the present invention.

[Explanation of symbols]

1 ... Revolving structure, 3 ... Driver's seat, 4b ... Projection part, 5 ... Boom,
11 ... Spindle, 12 ... Bracket, 14 ... Swing cylinder, 16 ... Walk-through boarding / alighting section (boarding / alighting section), 17 ... Internal combustion engine, 18 ... Direction switching valve, 19 ... Hydraulic oil tank, 20
… Fuel tank.

Claims (8)

[Claims] 1. A turning system in which a driver's seat is mounted on the front side of one side and various parts such as an internal combustion engine, a directional control valve, a hydraulic oil tank, and a fuel tank for the internal combustion engine are mounted on the other side and substantially the rear side of the driver's seat. And a boom swinging in the left-right direction via a support shaft supported by a bracket projecting forward of the revolving structure, and at least a rear half of the revolving structure is formed so as to be rotatable within the vehicle width. In the hydraulic working machine, the swing angle of the boom is set to a predetermined angle smaller than 180 °, and the swing range is set to a range other than the range on the driver seat side from the reference line extending in the front-rear direction of the swing structure through the support shaft. While the side range is small,
A hydraulic working machine characterized in that a projecting portion projecting in a region other than the swing range of the boom located on the other side of the driver's seat is provided. 2. The projecting portion is provided so as to project in the vicinity thereof along the boom located at one end of a swing range where one side thereof is located on the other side of the driver's seat. 1. The hydraulic working machine described in 1. 3. The boom has a base end pivotally supported on the other side of the driver's seat at a predetermined distance from a center line extending in the front-rear direction of the revolving structure. Or the hydraulic working machine described in 2. 4. The swing angle of the boom is set to 140 °, and the swing angle is 85 ° to 90 ° on the driver's seat side through a reference line extending in the front-rear direction of the swing structure through the support shaft. The hydraulic working machine according to any one of claims 1 to 3, wherein the other side is distributed at 55 ° to 50 °. 5. The hydraulic working machine according to claim 1, wherein the fuel tank is mounted on the protruding portion. 6. The hydraulic working machine according to claim 1, wherein the projecting portion is provided with a boarding / alighting portion extending from an outer peripheral edge of the revolving structure toward a driver's seat. 7. The fuel tank is installed at a lower position of the boarding / alighting section, and a swing cylinder for driving the swing of the boom is provided at a lower position of the driver's seat. Hydraulic working machine. 8. The hydraulic working machine according to claim 1, wherein the boom is pivotally supported by a bracket fixed to the protruding portion via a support shaft.