JP5290453B1 - Excavator - Google Patents

Abstract

A hydraulic excavator capable of preventing the hydraulic hose from being damaged by avoiding interference between the hydraulic hose and a part of the exterior even when the size of the exterior of the upper swing body is increased.
A hydraulic excavator 1 includes a main valve 22 mounted on the right side of a work machine 4 on an upper swing body 3 and a plurality of hydraulic hoses having a first end connected to the main valve 22 and a boom 11. And an attachment portion 21 that is fixed on the upper surface 11b.
[Selection] Figure 6

Description

  The present invention relates to a hydraulic excavator equipped with various actuators that are driven by pressure oil supplied via hydraulic piping.

2. Description of the Related Art Conventionally, there is a hydraulic excavator that includes an upper revolving body that is capable of revolving with respect to a lower traveling body that travels by rotating a crawler belt, and on which an operating machine such as a boom and a bucket that are hydraulically driven is mounted on the upper revolving body. It is used.
For example, the following Patent Document 1 discloses a hydraulic excavator in which a hydraulic hose connected to a main valve arranged on the side of a work implement is arranged via an attachment portion attached to a side surface of the work implement (boom). It is disclosed.

JP 2010-106450 A (published on May 13, 2010)

However, the conventional hydraulic excavator has the following problems.
That is, in the hydraulic excavator disclosed in the above publication, since the hydraulic hose is attached to the side surface of the boom, the size of the exterior part (for example, the cover of the hydraulic oil tank) of the upper swing body of the hydraulic excavator has increased. In this case, when the boom is driven up and down, the attachment portion of the hydraulic hose and a part of the exterior may interfere with each other.

  An object of the present invention is to provide a hydraulic excavator capable of extending the life of the hydraulic hose by avoiding interference between the hydraulic hose and a part of the exterior even when the size of the exterior of the upper swing body is increased. There is to do.

A hydraulic excavator according to a first invention includes a lower traveling body capable of traveling by rotating a crawler belt, an upper swing body, a boom, a work implement, a plurality of hydraulic cylinders, a main valve, a hydraulic hose, And an attachment portion. The upper swing body is mounted on the lower traveling body in a state where the upper swing body can swing. The boom is mounted on the upper swing body in a state where it can be driven in the vertical direction around the rotation axis by hydraulic pressure. The work implement is attached to the tip of the boom and performs various operations. A plurality of hydraulic cylinders are provided along the boom for driving the boom and work implement. The main valve is disposed on the side of the boom on the upper swing body. The hydraulic hose has a first end connected to the main valve and a second end connected to the hydraulic cylinder, and supplies pressure oil from the main valve to the hydraulic cylinder. The attachment portion fixes an intermediate portion of the hydraulic hose to the upper surface of the boom. The attachment portion has a connection portion that is fixed to the side surface of the boom, and a fixing portion that fixes the hydraulic hose so as to be disposed on the upper surface of the boom.

  Here, in a hydraulic excavator that performs work by supplying pressure oil to a boom mounted on the upper swing body and a hydraulic cylinder that drives a work implement attached to the tip of the boom, the boom on the upper swing body A mounting portion is provided so that an intermediate portion of a hydraulic hose that supplies pressure oil to each hydraulic cylinder from a main valve disposed on the side of the boom is disposed on the upper surface of the boom.

Here, the work implement includes a bucket, a ripper, a cutter, and the like. Further, the upper surface of the boom means a surface on the cab side in a direction in which the boom of the box structure is driven up and down.
As a result, a part of the hydraulic hose is arranged on the upper surface of the boom, so that the hydraulic pressure generated when the boom is moved up and down compared to the conventional configuration in which the intermediate part of the hydraulic hose is fixed to the side surface of the boom. The amount of slack in the hose can be controlled within an appropriate range.

As a result, even if the exterior height of the upper swing body has increased with the increase in equipment mounted on the upper swing body in recent years, interference between the hydraulic hose and a part of the upper swing body exterior is avoided. Thus, the service life of the hydraulic hose can be extended.
Furthermore, here, an attachment portion having a connection portion that is fixed to the side surface of the boom and a fixing portion that fixes the hydraulic hose to the upper surface side of the boom is used.
Thereby, a hydraulic hose can be fixed to the upper surface of a boom, providing the fixing location of attachment part itself in a boom side surface.

A hydraulic excavator according to a second aspect of the present invention is the hydraulic excavator according to the first aspect of the present invention, and the hydraulic hose is arranged along the exterior part of the upper swing body in the state where the boom is raised most.
Here, the hydraulic hose is arranged along the exterior part of the upper swing body in a state where the boom is lifted to the uppermost position.
Thereby, it is possible to prevent the hydraulic hose from interfering with the exterior portion of the upper swing body at the boom position where the amount of slack of the hydraulic hose is the largest.

A hydraulic excavator according to a third aspect of the present invention is the hydraulic excavator according to the second aspect of the present invention, further comprising a bracket portion provided in the vicinity of the main valve and at a position facing the mounting portion. A hydraulic hose between the bracket portion and the mounting portion is linearly arranged.
Here, a bracket portion is provided in the vicinity of the main valve in order to linearly guide the hydraulic hose whose first end is connected to the main valve toward the upper surface (attachment portion) of the boom.
Thereby, the hydraulic hose having the first end connected to the main valve can be easily guided linearly toward the upper surface (attachment portion) of the boom via the bracket.

Hydraulic excavator according to a fourth aspect of the present invention, a hydraulic excavator according to a third inventions, the bracket portion includes a base portion attached along a longitudinal direction of the vehicle body, are arranged obliquely with respect to the base portion And a guide portion for guiding the cage hydraulic hose.
Here, the bracket part which has the base part arrange | positioned along the vehicle body front-back direction and the guidance | induction part arrange | positioned diagonally with respect to a base part is used.

Here, the vehicle body front-rear direction means the front-rear direction in a state where the operator is seated on the driver's seat of the cab of the excavator.
Thus, by using a bracket portion with a simple configuration, the hydraulic hose having the first end connected to the main valve arranged on the side of the boom is guided toward the upper surface of the boom, so that it can be attached from the main valve. The hydraulic hose can be arranged linearly up to the part.

  According to the hydraulic excavator according to the present invention, it is possible to prevent the hydraulic hose from being damaged by avoiding interference between the hydraulic hose and a part of the exterior of the upper swing body.

1 is an overall perspective view showing a configuration of a hydraulic excavator according to an embodiment of the present invention. The perspective view which shows the internal structure of the working machine periphery in the state which took the exterior cover of the hydraulic shovel of FIG. The side view which shows the structure around the working machine of the hydraulic shovel of FIG. The rear view which shows the structure of the working machine periphery of the hydraulic shovel of FIG. Sectional drawing which shows the structure of the attachment part periphery for fixing a some hydraulic hose to a boom upper surface in the hydraulic shovel of FIG. The top view which shows the internal structure of the working machine periphery in the state which took the exterior cover of the hydraulic shovel of FIG. The perspective view which shows the structure of the bracket periphery which fixes a hydraulic hose in the structure of FIG. The perspective view which shows the structure of the bracket of FIG. The side view which shows the slack state of the hydraulic hose when the boom of the hydraulic shovel of FIG. 1 is driven up and down. The perspective view which shows the motion of the hydraulic hose at the time of moving the boom of the hydraulic shovel of FIG. 1 up and down from an upper end to a lower end.

The hydraulic excavator 1 according to an embodiment of the present invention will be described below with reference to FIGS.
The “front-rear” and “left-right” directions used in the following description mean directions seen from the driver seated on the seat in the cab 10 of the excavator 1.
[Configuration of hydraulic excavator 1 as a whole]
A hydraulic excavator 1 according to the present embodiment is a small rear swing type hydraulic excavator, and as shown in FIG. 1, a lower traveling body 2, an upper swing body 3, a work machine (actuator) 4, and a counterweight. 5, an engine room 6, and a cab 10.

The lower traveling body 2 has the crawler belt P wound around the left and right ends in the traveling direction to rotate the hydraulic excavator 1 forward and backward, and the upper revolving body 3 is mounted on the upper part in a state where the upper revolving body 3 can be swung. Yes.
The upper swing body 3 can be swung in any direction on the lower traveling body 2, and has a work machine 4, a counterweight 5, an engine room 6, a cab 10, and a main valve 22 (FIG. 2) on the upper surface. See). Further, as shown in FIG. 2, the upper swing body 3 has a work implement mounting portion 3 a that is fixed in a state in which the end portion of the boom 11 included in the work implement 4 is rotatable. The work implement mounting portion 3a is provided on the upper surface of the upper swing body 3 so as to protrude upward from the main beam that constitutes the upper swing body, and is loaded with a rotation shaft serving as the rotation center of the boom 11. .

  As shown in FIG. 2, the work machine 4 is attached to a work machine mounting portion 3 a provided at substantially the center of the upper surface of the upper swing body 3 in a rotatable state. Further, as shown in FIG. 1, the work machine 4 includes a boom 11 bent at the center portion, an arm 12 attached to the tip of the boom 11, and a bucket (work implement) 13 attached to the tip of the arm 12. have. The excavator 1 drives the hydraulic cylinders 11a, 12a, and 13a with the pressure oil supplied through the hydraulic hose 20, thereby moving the boom 11, the arm 12, the bucket 13, and the like up and down. Work at the site of civil engineering work where excavation of sand and gravel. The configuration around the work machine 4 will be described in detail later.

The counterweight 5 is made of, for example, scrap iron or concrete in a box formed by assembling steel plates, and is hardened. The engine room on the upper swing body 3 is used to balance the vehicle body during mining. 6 is provided behind.
As shown in FIG. 1, the engine room 6 is disposed at a position adjacent to the counterweight 5 and has an upper opening for inspection covered with an openable engine hood 14. The engine room 6 accommodates an engine (not shown), a cooling core (not shown), etc., which are power sources for driving the lower traveling body 2 and the work implement 4.

The cab 10 has an interior space in which a driver of the excavator 1 gets on and off. The cab 10 has a door for getting on and off for the driver to enter and exit the indoor space on the left side.
As shown in FIG. 2, the main valve 22 is provided on the upper swing body 3 in order to supply pressure oil to each of the hydraulic cylinders 11a, 12a, and 13a via a plurality of hydraulic hoses 20 from a hydraulic pump (not shown). It arrange | positions at the side of the working machine mounting part 3a. The arrangement of the main valve 22 will be described in detail later.
In addition, since the hydraulic excavator 1 of this embodiment is a backward small turning type, the space on the upper surface side of the upper turning body 3 is narrower than a normal hydraulic excavator. For this reason, in this embodiment, the main valve 22 is provided on the right side rather than behind the work implement mounting portion 3 a on the upper surface side of the upper swing body 3.

[Configuration around work equipment 4]
As described above, the hydraulic excavator 1 of the present embodiment includes the hydraulic cylinders 11a, 12a, and 13a that drive the boom 11, the arm 12, and the bucket 13 that constitute the work implement 4, respectively.

Each hydraulic cylinder 11a, 12a, 13a has one end (first end) on the main valve 22 disposed on the right side of the work implement mounting portion 3a on the upper swing body 3, and each hydraulic cylinder 11a, 12a, 13a. The other end (second end) is driven by pressure oil supplied from a plurality of hydraulic hoses 20 respectively connected thereto.
As shown in FIG. 2, the plurality of hydraulic hoses 20 are connected to a main valve 22 at a first end, an intermediate portion thereof is fixed to the upper surface 11 b of the boom 11, and a second end is connected to each of the hydraulic cylinders 11 a, 12 a, 13 a. It is connected to the. And as shown in FIG. 3, in the state which raised the boom 11, the several hydraulic hose 20 is arrangement | positioning of the attaching part 21 etc. which are mentioned later so that it may not contact the exterior part H of the upper revolving structure 3. It arrange | positions along the shape of the exterior part H. FIG. Thereby, even when the boom 11 is repeatedly moved up and down to the uppermost position of the boom 11 at which the deflection amount of the hydraulic hose 20 becomes the largest, it is possible to prevent the hydraulic hose 20 from being damaged.

An attachment portion 21 that fixes the plurality of hydraulic hoses 20 together is provided at a position slightly below the center of the boom 11. Further, a bracket portion 23 and a hose clamp 24 are provided on the first end side of the plurality of hydraulic hoses 20 to guide the plurality of hydraulic hoses 20 together to the upper surface 11 b side of the boom 11.
As shown in FIG. 4, the attachment portion 21 is provided for collectively fixing the plurality of hydraulic hoses 20 on the upper surface 11 b of the boom 11. As shown in FIG. 5, the attachment portion 21 includes a connection portion 21 a that is fixed to the side surface 11 c of the boom 11, a fixing portion 21 b that collectively fixes the plurality of hydraulic hoses 20 on the upper surface 11 b of the boom 11, have.

  The connecting portion 21 a is formed of a flat steel plate and is fixed to the side surface 11 c of the boom 11 using a plurality of bolts 31. The fixing portion 21b is a portion that collectively fixes the plurality of hydraulic hoses 20 on the upper surface 11b of the boom 11, and is formed by bending a flat steel plate of the connecting portion 21a into a substantially U shape. That is, in the present embodiment, the attachment portion 21 itself is fixed to the side surface 11c of the boom 11 at the flat connection portion 21a. On the other hand, the attachment portion 21 fixes a plurality of hydraulic hoses 20 together on the upper surface 11b of the boom 11 at a portion (fixing portion 21b) connected to the flat connection portion 21a.

As shown in FIG. 6, the main valve 22 is disposed on the side of the boom 11 on the upper swing body 3. Here, being arranged on the side of the boom 11 means being arranged at a position eccentric from the center line of the boom 11.
As shown in FIG. 6, the bracket portion 23 collects a plurality of hydraulic hoses 20 having a first end connected to a main valve 22 disposed on the right side of the work implement mounting portion 3 a in a plan view of the excavator 1. In order to guide substantially linearly toward the upper surface 11 b of the boom 11, that is, the fixing portion 21 b of the mounting portion 21 fixed to the boom 11, it is provided in the vicinity of the main valve 22. More specifically, as shown in FIG. 7, the bracket portion 23 is attached to the side surface on the main valve 22 side of the work implement mounting portion 3 a arranged along the front-rear direction of the excavator 1. The bracket portion 23 is a member configured by bending a planar steel plate, and includes a pedestal portion 23a and a guide portion 23b as shown in FIG.

The pedestal portion 23a is a part of a flat steel plate having a plurality of holes into which bolts are inserted, and is fixed to the side surface of the work implement mounting portion 3a using the bolts as shown in FIG. .
As shown in FIG. 8, the guide portion 23b is a part of a flat steel plate formed so as to be inclined by a predetermined angle with respect to the pedestal portion 23a fixed to the side surface of the work implement mounting portion 3a. A hose clamp 24 is attached. Note that the bending angle of the guide portion 23b with respect to the pedestal portion 23a is set so as to guide the plurality of hydraulic hoses 20 together in a substantially straight line toward the upper surface 11b of the boom 11, as shown in FIG. ing. That is, the guide portion 23b is set so as to guide the plurality of hydraulic hoses 20 toward the upper surface 11b of the boom 11 with respect to the pedestal portion 23a attached along the front-rear direction of the hydraulic excavator 1. Yes.

  As shown in FIG. 7, the hose clamp 24 is attached to the guide portion 23 b in order to guide the plurality of hydraulic hoses 20 together in a substantially straight line toward the upper surface 11 b of the boom 11. That is, the hose clamp 24 is attached to the guide portion 23b bent at a predetermined angle with respect to the pedestal portion 23a, so that the plurality of hydraulic hoses 20 are gathered together toward the upper surface 11b of the boom 11 in a substantially straight line. Can be guided up.

<The movement of the hydraulic hose 20 accompanying the vertical movement of the boom 11>
As described above, the hydraulic excavator 1 according to the present embodiment includes a main valve 22 mounted on the right side of the work machine 4 on the upper swing body 3 and a plurality of hydraulic hoses having a first end connected to the main valve 22. And an attaching portion 21 for fixing the intermediate portions together on the upper surface 11 b of the boom 11.

Therefore, as shown in FIG. 9, the position of the boom 11 when the hydraulic excavator 1 is transported, the position S2 where the boom 11 is lowered downward (see the solid line in the figure), and the position where the boom is raised upwards. Until S3, the deflection amount of the plurality of hydraulic hoses 20 can be controlled to be within an appropriate range.
That is, at the position S <b> 2 of the boom 11 that is lowered most downward, the distance from the bracket portion 23 attached in the vicinity of the main valve 22 to the attachment portion 21 attached to the boom 11 is the largest. For this reason, the amount of deflection of the hydraulic hose 20 is minimized. At this time, as shown in FIG. 9, the plurality of hydraulic hoses 20 hold an appropriate amount of deflection.

Next, since the distance from the bracket portion 23 to the mounting portion 21 is slightly smaller at the position S1 of the boom 11 when the excavator 1 is transported than at the position S2 of the boom 11, a plurality of hydraulic hoses 20 are provided. Although the amount of deflection is slightly larger, there is no amount of deflection to the extent that it contacts the exterior portion H of the upper swing body 3.
Next, at the position S3 of the boom 11 raised to the highest position, the distance from the bracket portion 23 attached in the vicinity of the main valve 22 to the attachment portion 21 attached to the boom 11 is the smallest. For this reason, the amount of deflection of the hydraulic hose 20 is maximized. However, in the present embodiment, even at the position S3 of the boom 11 where the deflection amount of the hydraulic hose 20 is the largest, as shown in FIG. It can be arranged along the part H.

  As a result, the amount of deflection of the hydraulic hose 20 when the boom 11 is raised and lowered is controlled so as to be within an appropriate range, and also in contact with the exterior portion H of the upper swing body 3 even at the position S3 where the amount of deflection is maximized. By disposing the hydraulic hose 20 so as not to move, it is possible to prevent the hydraulic hose 20 from being damaged due to contact between the hydraulic hose 20 and a part of the exterior portion H as the boom 11 moves up and down. .

Moreover, in the hydraulic excavator 1 of this embodiment, without moving the attachment position with respect to the boom 11 of the attachment part 21 which fixes the several hydraulic hose 20 collectively on the upper surface 11b of the boom 11 to a position higher than before. The range of fluctuation of the deflection amount of the hydraulic hose 20 accompanying the vertical movement of the boom 11 is controlled to be within an appropriate range.
Thereby, when the excavator 1 is transported in a state where it is placed on the loading platform of the trailer, there is no conflict with the height regulation during transportation.

Furthermore, in the hydraulic excavator 1 of the present embodiment, as shown in FIG. 6, a plurality of hydraulic hoses 20 are arranged substantially linearly from the bracket portion 23 disposed in the vicinity of the main valve 22 toward the upper surface 11 b of the boom 11. It is arranged.
Thereby, the twist of the hydraulic hose 20 which arises when the boom 11 is moved up and down can be suppressed to the minimum.

Further, in the excavator 1 of the present embodiment, as shown in FIG. 3, the plurality of hydraulic hoses 20 are not in contact with the exterior portion H of the upper swing body 3 at the position of the boom 11 that is raised to the uppermost position. A hydraulic hose 20 is disposed along the exterior portion H.
As a result, even when the boom 11 is repeatedly moved up and down to the uppermost position of the boom 11 where the deflection amount of the hydraulic hose 20 is the largest, the hydraulic hose 20 is damaged by contacting the exterior portion H of the upper swing body 3. Can be prevented.

[Other Embodiments]
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of invention.
(A)
In the said embodiment, an example using the attaching part 21 containing the connection part 21a which consists of a flat steel plate, and the fixing | fixed part 21b shape | molded by processing a flat steel plate into a substantially U shape is given and demonstrated. did. However, the present invention is not limited to this.
The shape of the mounting portion 21 can be appropriately changed according to the number and shape of the hydraulic hoses 20 and the direction to be guided.

(B)
In the said embodiment, the bracket part 23 which brings together the some hydraulic hose 20 and guides it on the upper surface 11b of the boom 11 was given and demonstrated as an example formed by bending a flat steel plate. However, the present invention is not limited to this.
The shape of the bracket portion 23 can be appropriately changed according to the number and shape of the hydraulic hoses 20 and the direction to be guided.

(C)
In the embodiment described above, the hydraulic excavator 1 having the bucket 13 attached thereto is described as an example as a work implement (attachment) attached to the tip of the work machine 4. However, the present invention is not limited to this.

  For example, the present invention may be applied to a hydraulic excavator in which other work tools such as a ripper and a cutter are attached to the tip of the work machine.

  The hydraulic excavator of the present invention has the effect of preventing the hydraulic hose from being damaged by avoiding interference between the hydraulic hose and a part of the exterior of the upper swing body. The present invention can be widely applied to construction machines that supply pressure oil.

DESCRIPTION OF SYMBOLS 1 Hydraulic excavator 2 Lower traveling body 3 Upper turning body 3a Work implement mounting part 4 Work implement 5 Counterweight 6 Engine room 10 Cab 11 Boom 11a Hydraulic cylinder 11b Upper surface 11c Side surface 12 Arm 12a Hydraulic cylinder 13 Bucket 13a Hydraulic cylinder 14 Engine hood 20 Hydraulic hose 21 Mounting part 21a Connection part 21b Fixing part 22 Main valve 23 Bracket part 23a Base part 23b Guide part 24 Hose clamp 31 Bolt H Exterior parts S1 to S3 Position

Claims (4)

A lower traveling body capable of traveling by rotating the crawler belt,
An upper swing body mounted on the lower traveling body in a swingable state; and
A boom mounted on the upper swing body in a state where it can be driven in a vertical direction around a rotation axis by hydraulic pressure;
A work implement attached to the tip of the boom for performing various operations;
A plurality of hydraulic cylinders provided along the boom for driving the boom and the work implement;
A main valve disposed on the side of the boom on the upper swing body;
A hydraulic hose that has a first end connected to the main valve and a second end connected to the hydraulic cylinder, and supplies pressure oil from the main valve to the hydraulic cylinder;
An attachment portion for fixing an intermediate portion of the hydraulic hose to the upper surface of the boom;
Equipped with a,
The attachment portion includes a connection portion that is fixed to a side surface of the boom, and a fixing portion that is fixed so that the hydraulic hose is disposed on an upper surface of the boom.
Hydraulic excavator. The hydraulic hose is arranged along the exterior part of the upper swing body in the state where the boom is raised most.
The hydraulic excavator according to claim 1. In the vicinity of the main valve, further comprising a bracket portion provided at a position facing the mounting portion,
The hydraulic hose between the bracket part and the mounting part is arranged linearly,
The hydraulic excavator according to claim 2. The bracket portion includes a pedestal portion attached along the vehicle body front-rear direction, and a guide portion that is disposed obliquely with respect to the pedestal portion and guides the hydraulic hose.
The hydraulic excavator according to claim 3 .

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