JP3693480B2 - Upper swing body of hydraulic excavator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an upper swing body of a construction machine such as a hydraulic excavator, and more particularly to an operation step for maintenance of a load on the upper swing body.
[0002]
[Prior art]
FIG. 7 is an overall side view of an example backhoe 1 described in Japanese Patent Laid-Open No. 8-302739. In the figure, 5 is a swivel of the backhoe 1, 7 is a cabin, 20 is a bonnet at the rear of the cabin 7, and 3 is an excavator mounted on the front part of the swivel 5. FIG. 8 is a plan view of the swivel base 5 in FIG. In the figure, 18 is an engine, 16 is a fuel tank, and 17 is an oil tank (hydraulic oil tank). In the conventional backhoe shown in FIGS. 7 and 8, the swivel 5 has a substantially circular shape with a front portion cut out in a plan view so that a small turn can be made during work. In the backhoe 1, no work step is provided on the upper surface side of the swivel base 5. When the excavator 3 is operated to the maximum raised state as shown in FIG. 7, the rear surface of the boom 8 (specifically, the first boom member 8 a) of the excavator 3 is the upper front end portion of the fixed hood 20 c of the bonnet 20 (reference numeral It is made to approach to the vicinity.
[0003]
FIG. 9 is a perspective view of an essential part of an upper rotating body 42 of an embodiment of a medium / large hydraulic excavator described in Japanese Utility Model Laid-Open No. 6-63659. In the upper swing body 42 in FIG. 9, an upper guard 43 that is a plurality of plates is disposed along the upper surface of the upper swing body 42, and the upper surface of the upper guard 43 is a rear end portion from the front end portion of the upper guard 43. It is formed so as to have a downward slope toward the top. A horizontal plane portion 44 for placing tools, oil cans and the like for maintenance work is formed on the upper surface of the upper guard 43. In FIG. 9, 45 is a counterweight attached to the rear part of the upper swing body 42, and 46 is a cab for the cab.
[0004]
In the upper turning body 42 shown in FIG. 9, when the driver rises to the upper surface of the upper guard 43 and opens a part of the upper guard 43, for example, when checking, adjusting, repairing, etc. the engine (not shown), Since the non-inclined horizontal plane portion 44 is used as a work step and small items such as tools and oil cans can be placed stably, it is convenient during the maintenance work.
[0005]
[Problems to be solved by the invention]
On the upper swing body of construction machines such as hydraulic excavators, the engine, various hydraulic devices and other various devices are mounted, but these devices may require maintenance, making maintenance easier than before. Thus, a maintenance work step is provided on the upper swing body. For example, in order to perform maintenance of the engine and its peripheral devices mounted on the rear device mounting portion behind the upper swing body, the engine cover is opened and provided between the work attachment mounting portion and the rear device mounting portion. Work from the work step.
[0006]
However, with the recent increase in construction in urban areas, small hydraulic excavators have increased. In this small hydraulic excavator, not only does not have enough space in the rear equipment mounting portion, but also when the work attachment is raised, the small hydraulic excavator is close to the rear equipment mounting portion. As described above, sufficient work steps could not be provided here. This tendency is more pronounced especially in small hydraulic excavators in which at least the rear end of the upper swinging body can swivel within the vehicle width, which necessitates maintenance work in a narrow work space and significantly impairs work efficiency. It was.
[0007]
In the backhoe 1 of the prior art shown in FIGS. 7 and 8, no work step is provided on the upper surface side of the swivel base 5. Therefore, it is difficult for an operator to perform maintenance work (including cleaning work in the vicinity of the upper surface side of the swivel 5) of the devices inside the swivel 5 from the upper surface side of the swivel 5. The present invention performs maintenance work on equipment such as a power source and hydraulic equipment mounted on an upper swing body (similar to the swivel) from the upper surface side of the upper swing body even in a small hydraulic excavator. Another object of the present invention is to provide an upper turning body of a construction machine in which a work step is provided on the upper surface side.
[0008]
[Means for Solving the Problems]
A work attachment mounting portion provided on the upper part of the upper swing body, and a boom that is a base end component that is mounted on the work attachment mounting portion so as to be raised and lowered so as to be tilted rearward. The attached work attachment, the rear equipment mounting portion on which the power source provided behind the work attachment mounting portion is mounted, and the side devices provided on the left and right sides of the work attachment mounting portion of the upper swing body A swivel motor disposed at a position surrounded by the mounting portion, the rear device mounting portion, the left and right side device mounting portions, and the work attachment; and in front of the rear device mounting portion; and A work step detachably provided between the left and right side equipment mounting parts, behind the work attachment mounting part and above the swing motor. The work step has substantially the same width as the left and right side device mounting portions, and is positioned below the upper surface of the rear device mounting portion, and the work when the work attachment is in the maximum raised state. Arranged to extend almost to the back of the attachment.
[0009]
Even if the work attachment is raised with the work attachment mounting portion as the base point and the vicinity of the base end portion of the work attachment is tilted backward, the work step can be performed by another device or other upper swivel body. The length of the work step in the front-rear direction can be set to be longer as it is arranged as far as possible in consideration of the relationship with the structure. Also, the operator's forward bending posture is eased during maintenance work.
[0010]
Further, the work step has substantially the same width as that between the left and right side device mounting portions. According to this, the tread surface of the work step can be further increased, and the workability of the maintenance work can be further improved.
[0011]
Furthermore, when the work attachment is in the maximum raised state, the work step is extended to the vicinity of the substantially rear surface of the work attachment. According to this, in the lower part where the distance between the rear surface of the work attachment and the rear equipment mounting portion is separated, the tread surface of the work step can be enlarged as much as possible within a range not interfering with the work attachment, and the workability of the maintenance work can be further improved. .
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a side view of a hydraulic excavator 10 equipped with an upper rotating body according to an embodiment of the present invention. In the figure, 11 is a lower traveling body of the excavator 10, 12 is an upper revolving body connected to the upper portion of the lower traveling body 11, 13 is a center frame that is a main frame of the upper revolving body 12, and 14 is an upper portion of the main frame 13. 15 is a work attachment attached to the work attachment attachment 14 so that it can be raised and lowered, 21 is a boom as a base side component of the work attachment 15, 22 is a boom cylinder, and 23 is an upper swing body. The cab for the operator's cab provided on the left side of the front part of the vehicle 12, 24 is a counterweight attached to the rear part of the upper swing body 12, 25 is a work step disposed behind the work attachment mounting part 14, 19 is It is a turning motor at a position below the work step 25.
[0013]
FIG. 2 is a plan view of a main part of the upper swing body 12 in FIG. In the figure, the work step 25 is hatched for easy understanding of the position of the work step 25. 26 is a rear device mounting portion provided behind the work attachment mounting portion 14, 27 is a power source mounted on the rear device mounting portion 26, for example, an engine (a radiator, an oil cooler, etc. is also mounted. , 28 is a left side device mounting portion on which the cab 23 is mounted, 29 is a fuel tank among other devices mounted on the left side device mounting portion 28, 30 is a right side device mounting portion, Reference numeral 31 denotes a hydraulic oil tank among the hydraulic equipment mounted on the right side mounting portion 30; 32, a control valve for controlling a hydraulic actuator (such as the boom cylinder 22); 33, an inner wall surface portion of the right side device mounting portion 30; A side cover provided between the working step 25, 34 is a front cover provided on the front side of the side cover 33, and 35 is the side cover 3. A bolt (not shown below) framework for clamping to secure the.
[0014]
FIG. 3 is a side view of the main part viewed from AA with the work attachment 15 attached to the upper swing body 12 shown in FIG. 2, but the work attachment 15 brings the boom 21 to the maximum raised state. . In the figure, 36 is a bolt that fastens and fixes the side cover 33 to the frame frame 35, and 37 is a bracket for mounting the work step 25 fixed to the side cover 33. FIG. 4 is a perspective view of the main part showing the vicinity of the work step 25 as seen from B of FIG. In the figure, 38 is a bolt that fastens and fixes the work step 25 to a fixing portion (for example, the bracket 37) of the upper swing body 12, and 39 is a bolt hole for inserting the bolt 38 opened in the work step 25. , 40 is a reinforcing rib fixed on the lower surface of the work step 25, and 41 is a rear cover. FIG. 5 is a plan view of the work step 25. FIG. 6 is a side view seen from C in FIG.
[0015]
Next, the configuration and operation of the upper swing body 12 according to an embodiment of the present invention will be described with reference to FIGS. In the present embodiment, the work attachment mounting part 14 provided on the upper part of the center frame 13 of the upper swing body 12, the work attachment 15 attached to the work attachment mounting part 14 so as to be raised and lowered, and the work attachment mounting part 14. A rear device mounting portion 26 (shown in FIG. 2) provided at the rear, a left device mounting portion 28 and a right device mounting portion 30 provided on the left and right sides of the work attachment mounting portion 14 of the upper swing body 12. The hydraulic excavator 10 includes a work step 25 provided between the rear device mounting portion 26 and the work attachment mounting portion 14 in plan view, and the work step 25 includes the rear device mounting portion 26. It was positioned below the upper surface b (shown in FIGS. 3 and 4) by a dimension h.
[0016]
Even if the work attachment 15 is raised with the work attachment mounting portion 14 as a base point and the boom 21 of the work attachment 15 is tilted backward as shown in FIG. Takes the length of the work step 25 in the front-rear direction so that it is arranged as far downward as possible (that is, in the direction in which the dimension h is extended) in consideration of the relationship with other equipment such as the engine 27 and other structures of the upper revolving structure 12. The length l (shown in FIGS. 2 to 6) can be set to a long size. By arranging the work step 25, the forward bending posture of the worker is eased during the maintenance work, and the work can be easily performed in a normal posture.
[0017]
Further, since the work step 25 is located above the portion where the normal swing motor 19 and swivel joint (not shown) are disposed, these devices can be protected from rain, snow, sand, etc. Since it can be removed by detaching, maintenance of these devices is also possible.
[0018]
Further, as shown in FIG. 2, the work step 25 has substantially the same width as the distance between the left side device mounting portion 28 and the right side device mounting portion 30 (the width size is W, but FIG. 2). , Shown in FIGS. 4 and 5). According to this, the tread surface of the work step 25 can be made larger, and the workability of the maintenance work can be further improved.
[0019]
Further, as shown in FIG. 3, in order to cope with the maximum working state of the work attachment 15, the work step 25 is extended to the vicinity of the substantially rear surface of the boom 21 of the work attachment 15 in the state. According to this, in the lower part where the distance between the rear surface of the boom 21 and the rear equipment mounting portion 26 is separated, the tread surface of the work step 25 can be maximized as long as it does not interfere with the boom 21, and the workability of the maintenance work is further increased. Can be improved.
[0020]
【The invention's effect】
The upper rotating body of the construction machine of the present invention has a work step provided between the rear device mounting portion and the work attachment mounting portion in a plan view, and the work step is below the upper surface of the rear device mounting portion. Therefore, even if the vicinity of the base end of the work attachment is tilted backward, the work step should be as low as possible in consideration of the relationship with other equipment and other structures of the upper rotating body. The longer the arrangement, the longer the length of the work step in the front-rear direction. By arranging the work steps, the forward bending posture of the worker is eased during the maintenance work, and the work can be easily performed in a normal posture.
[0021]
In addition, since the operation step is usually located above the portion where the devices such as the swing motor and swivel joint are arranged, these devices can be protected from rain and snow, sand, etc., and can be removed. Maintenance of these devices is also possible.
[0022]
Furthermore, since the work step has substantially the same width as the distance between the left and right side equipment mounting parts, the step surface of the work step can be made larger, and the workability of the maintenance work can be further improved. be able to.
[0023]
Further, since the work step is extended to the vicinity of the substantially rear surface of the work attachment in order to cope with the maximum raising state of the work attachment, it interferes with the work attachment in the lower part where the distance between the rear surface of the work attachment and the rear device mounting portion is separated. The tread surface of the work step can be increased as much as possible within the range where the operation is not performed, and the workability of the maintenance work can be further improved.
[0024]
Therefore, in the upper swing body of the construction machine of the present invention, a sufficiently large work step can be secured on the upper surface side of the upper swing body, so that the maintenance work can be easily performed in a normal posture and the work efficiency can be improved. Can be raised.
[Brief description of the drawings]
FIG. 1 is a side view of a hydraulic excavator equipped with an upper swing body according to an embodiment of the present invention.
FIG. 2 is a plan view of a main part of the upper swing body in FIG. 1;
FIG. 3 is a side view of a main part viewed from AA with the work attachment attached to the upper swing body shown in FIG. 2;
4 is a perspective view of a main part showing the vicinity of a work step as seen from B in FIG. 2;
FIG. 5 is a plan view of the work step shown in FIG. 4;
6 is a side view as seen from C in FIG. 5;
FIG. 7 is an overall side view of a backhoe according to an embodiment of the prior art.
8 is a plan view of the swivel base in FIG. 7. FIG.
FIG. 9 is a perspective view of a main part of an upper swing body of an embodiment of a conventional hydraulic excavator.
[Explanation of symbols]
12, 42, 5 Upper swing body (swivel base)
14 Work attachment mounting parts 15, 3 Work attachment (excavator)
19 Rotating motors 21 and 8 Boom 22 Boom cylinder 25 Working step 26 Rear equipment mounting part 27 and 18 Engine 28 Left side equipment mounting part 29 and 16 Fuel tank 30 Right side equipment mounting part 31 and 17 Hydraulic oil tank 32 Control valve

Claims (1)

A work attachment mounting portion provided on the upper part of the upper swing body;
A work attachment having a boom that is a base end component attached to the work attachment attachment portion so as to be raised and lowered so as to be raised up to a rearward tilt state ;
A rear device mounting portion on which a power source provided behind the work attachment mounting portion is mounted;
Side device mounting portions provided on both left and right sides of the work attachment mounting portion of the upper swing body, a position surrounded by the rear device mounting portion, the left and right side device mounting portions, and the work attachment A swivel motor arranged in the
It has a work step that is detachably provided in front of the rear equipment mounting section, between the left and right side equipment mounting sections, behind the work attachment mounting section, and above the turning motor. ,
The work step has substantially the same width as that between the left and right side device mounting portions, and is substantially below the rear surface of the work attachment when the work attachment is in the maximum raised position, below the upper surface of the rear device mounting portion. An upper swing body of a hydraulic excavator characterized by being extended to the vicinity.

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