JP6909759B2 - Work machine - Google Patents

Description

The present invention relates to a work machine such as a hydraulic excavator provided with a swivel body that swivels on a traveling body, and more particularly to a structure of a counterweight installed at the rear of the swivel body.

In general, a work machine such as a hydraulic excavator includes a traveling body, a swivel body rotatably mounted on the upper part of the traveling body, and a working machine rotatably mounted on the front side of the swivel body. A counterweight is installed at the rear of the body to balance the weight with the work equipment. A driver's cab is provided at the front of the swivel body, and in addition to the driver's seat on which the operator sits, operating means such as operating levers and pedals are provided in the driver's cab. Furthermore, in the rear part of the driver's cab, a machine room building where machinery such as an engine, hydraulic oil tank, fuel tank, and battery are installed is arranged, and a counterweight is installed so as to cover the rear of the engine. ing.

Among such work machines, especially in the small swivel type model, since it is necessary to reduce the swivel radius of the swivel body, the counterweight has a structure closer to the swivel center side. In that case, the space between the engine and the counterweight must be narrowed, so when inspecting and repairing (maintenance work) various equipment such as alternators, starters, AC compressors, and turbos attached to the engine, the engine It becomes difficult to secure a work space behind the engine.

Therefore, conventionally, as described in Patent Document 1, the counter weight has a two-divided structure of a main body weight and a divided weight, and an opening that penetrates in the front-rear direction is provided in the main body weight installed in the swivel body. There is known a work machine in which a split weight is detachably attached to an opening. According to such a configuration, when maintenance of engine parts is required, when the split weight is lifted by a crane and removed from the opening of the main body weight, a work space is secured by the opening behind the engine. The engine can be accessed from the outside through the unit, and maintenance of engine parts can be performed without removing the entire counterweight.

Japanese Patent No. 4289747

However, in the counter weight of the work machine described in Patent Document 1, a heavy split weight is lifted by a crane and removed from the main body weight, maintenance work of engine parts is performed in this state, and the split weight is reattached after the work is completed. Since it is necessary to lift it with a crane and attach it to the main body weight, there is a problem that maintenance work requires a lot of time. Further, since a crane is required to attach / detach the split weight, if the work machine is in a narrow work site where the crane cannot enter, the split weight cannot be removed to perform maintenance work.

The present invention has been made from the actual situation of such a prior art, and an object of the present invention is to provide a work machine capable of securing a work space for maintenance on a counterweight without using a crane. ..

In order to achieve the above object, a typical invention of the present invention includes a self-propelled traveling body, a swivel body rotatably mounted on the traveling body, and rotatably attached to the front side of the swivel body. and a working machine that is, the end portion after said turning body, a working machine in which a counterweight is disposed so as to surround the engine housed inside the engine compartment from the rear, the counterweight, It has a body weight that is placed on the swivel body, and a movable weight held in the body weight, the body weights, housing concavity recessed from the front surface toward the rear, facing the engine provided at a position, wherein the movable weight, the slidably housed in Oite lateral direction in the accommodating recess, the movable weight on the weight of the body weight a first end portion of the left-right direction in the accommodating recess At the normal position where the weight of the engine is added, it is characterized in that it faces a device attached to the engine and requires maintenance.

According to the work machine of the present invention, it is possible to secure a work space for maintenance on the counterweight without using a crane. Issues, configurations, and effects other than those described above will be clarified by the following description of the embodiments.

It is an overall block diagram of the hydraulic excavator which concerns on embodiment of this invention. It is a top view which shows the positional relationship between an engine and a counterweight. It is a perspective view which shows the state which fixed the movable weight in the normal position of the main body weight. It is a perspective view which shows the state which moved the movable weight to the working position of the main body weight. It is a perspective view which shows the state in the process of removing a movable weight from a main body weight. It is a perspective view which shows the main body weight after removing a movable weight. It is sectional drawing which follows the line VII-VII of FIG. It is a perspective view which shows the modification of the counter weight. It is a perspective view which shows the state which removed the cover member from the counter weight of FIG.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 9.

FIG. 1 is an overall configuration diagram showing a hydraulic excavator 100 as an example of a work machine. As shown in FIG. 1, the hydraulic excavator 100 according to the embodiment of the present invention has a self-propelled traveling body 1, a swivel body 2 mounted on the traveling body 1 so as to be swivel, and a swivel body 2 on the front side of the swivel body 2. It is provided with a work machine 3 that is rotatably attached.

The work machine 3 has a boom 5 whose base end side is pivotally attached to the swivel body 2 and which is undulating by the boom cylinder 4, and an arm 7 which is pivotally attached to the tip end side of the boom 5 and is rotatable by the arm cylinder 6. , The bucket 9 is pivotally attached to the tip end side of the arm 7 and is rotatable by the bucket cylinder 8.

A driver's cab 10 is installed in the swivel body 2 at the front position on the left side of the work machine 3, and inside the driver's cab 10, in addition to the driver's seat on which the operator sits, the work machine 3 is operated. Operation levers and pedals are provided. Further, an engine chamber 11 is installed in the rear portion of the driver's cab 10 in the swivel body 2, and an engine (described later) is housed inside the engine chamber 11. Further, a counterweight 12 is installed at the rear end of the swivel body 2.

Next, the structure of the counterweight 12 will be described in detail with reference to FIGS. 2 to 7.

FIG. 2 is a plan view showing the positional relationship between the engine 13 and the counterweight 12 arranged on the swing body 2. As shown in FIG. 2, the counter weight 12 is composed of a main body weight 14 and a movable weight 15, and the counter weight 12 is arranged so as to surround the engine 13 from the rear. The engine 13 is housed inside the engine chamber 11, and the engine 13 is shown in a simplified manner in FIG. 2, but the engine 13 includes various devices such as an alternator, a starter, an AC compressor, and a turbo (all of which are shown in the figure). Omitted) is attached. Of these devices, the devices that require maintenance such as repair and inspection are arranged in the right region (the P portion indicated by hatching in FIG. 2) at the rear of the engine 13. Hereinafter, when the swivel body 2 is viewed in a plan view, the side on which the driver's cab 10 is arranged is described as the front, the side on which the counterweight 12 is arranged is the rear, and the direction orthogonal to the front-rear direction is described as the left-right direction.

The main body weight 14 is fixedly installed on the swivel body 2, and the left side portion of the main body weight 14 is formed thicker than the right side portion. That is, looking at the weight distribution of the main body weight 14 alone, the right half is lighter than the left half. As shown in FIGS. 3 to 7, a storage recess 16 having front and upper openings is provided in the central portion of the front surface of the main body weight 14, and the engine 13 is arranged in front of the storage recess 16 so as to face each other. ing. Assuming that the width dimension of the storage recess 16 in the left-right direction is W1 and the width dimension of the engine 13 is W2, the width dimension W1 of the storage recess 16 is set to be larger than the width dimension W2 of the engine 13 (W1> W2). ing.

The main body weight 14 is formed with an upper rail 14a and a lower rail 14b extending in the left-right direction. The upper rail 14a is formed at an upper position in the storage recess 16, and an upper guide groove 14c extending in the left-right direction is formed behind the upper rail 14a. The lower rail 14b is formed at the lower end position of the storage recess 16, and a lower guide groove 14d extending in the left-right direction is formed on the bottom surface of the storage recess 16 located behind the lower rail 14b.

Further, a notch 14e protruding rearward from the upper opening of the storage recess 16 is formed on the upper surface of the main body weight 14, and this notch 14e is a space above the upper guide groove 14c in the left region of the storage recess 16. It communicates with. A stopper member 17 is arranged inside the notch 14e, and the stopper member 17 is detachably attached to the main body weight 14 by fasteners such as bolts and screws. Further, the storage recess 16 of the main body weight 14 is provided with two locking holes 14f and two locking holes 14g, respectively, and these locking holes 14f and 14g are located below the upper rail 14a along the left-right direction. Are arranged on the same line (see FIG. 6). Of these locking holes 14f and 14g, two locking holes 14f are arranged in the right side region of the storage recess 16 and two locking holes 14g are arranged in the left side region of the storage recess 16.

The movable weight 15 is a block body having a rectangular parallelepiped shape, and the width dimension of the movable weight 15 is set to about half of the width dimension W1 of the storage recess 16. A plurality of rollers 18 that roll on the upper rail 14a are provided on the upper rear surface of the movable weight 15, and a plurality of rollers 19 that roll on the lower rail 14b are provided on the lower front lower end of the movable weight 15. Since the slide mechanism is composed of the rollers 18 and 19 and the corresponding rails 14a and 14b, the movable weight 15 can be moved in the left-right direction of the storage recess 16 by a manual operation of the worker. Here, the movable weight 15 is slidably accommodated between the normal position of the right end portion and the working position of the left end portion in the storage recess 16, and the movable weight 15 is housed in the regular position of the right end portion of the storage recess 16. At the time, the weight of the movable weight 15 is added to the main body weight 14, and the weight distribution of the entire counter weight 12 becomes even on the left and right.

A fall-prevention piece 15a having an inverted L-shaped cross-sectional shape is projected from the upper part of the rear surface of the movable weight 15 as a fall-prevention member, and the fall-prevention piece 15a is movable so as to cover one of the rollers 18. It is arranged on the left side portion of the weight 15. As shown in FIG. 7, the fall-out prevention piece 15a engages with the upper guide groove 14c behind the upper rail 14a to restrict upward and forward movement, and the lower end of the movable weight 15 is the lower rail. Since the movable weight 15 is engaged with the lower guide groove 14d behind the 14b, measures are taken to prevent the movable weight 15 from falling out of the storage recess 16.

When the movable weight 15 is moved to the working position at the left end of the storage recess 16, the dropout prevention piece 15a is located directly below the notch 14e of the main body weight 14, and the notch 14e is located in the left-right direction. The width dimension of is set to be larger than the width dimension of the dropout prevention piece 15a in the left-right direction. Therefore, when the stopper member 17 fixed inside the notch 14e is removed, the dropout prevention piece 15a can be passed through the notch 14e and moved above the main body weight 14, and the movable weight 15 can be moved above the main body weight 14. It can be removed from the storage recess 16.

Further, a handle 20 as a grip portion is provided on the upper part of the front surface of the movable weight 15, and two holding holes 15b that penetrate the movable weight 15 in the front-rear direction are provided in the vicinity of the handle 20. These holding holes 15b are arranged at positions corresponding to the respective locking holes 14f and 14g provided in the storage recess 16, and the fasteners 21 such as bolts and screws are inserted into the holding holes 15b to provide the corresponding locking. When attached to the holes 14f and 14g, the movable weight 15 is fixed to the regular position and the working position of the storage recess 16. Therefore, the movable weight 15 can be fixed to the main body weight 14 at a plurality of positions (in the present embodiment, two positions, a normal position and a working position) in the storage recess 16.

According to the hydraulic excavator 100 according to the present embodiment, as shown in FIG. 3, in the normal state, the movable weight 15 is fixed to the regular position of the storage recess 16 of the main body weight 14, and the counter weight 12 as a whole is fixed. Since the weight distribution is even on the left and right sides, the operation of the work machine 3 and the running of the traveling body 1 are not hindered.

When inspection and repair (maintenance) around the engine including the engine 13 and accessories is required at the work site, first, the fastener 21 is detached from the locking hole 14f, and the movable weight 15 with respect to the main body weight 14 After releasing the fixing, as shown in FIG. 4, the movable weight 15 is moved from the normal position on the right side of the storage recess 16 to the working position on the left side. At that time, the rollers 18 and 19 provided on the movable weight 15 roll on the rails 14a and 14b provided on the main body weight 14, so that the operator can handle the handle 20 despite the heavy movable weight 15. The movable weight 15 can be manually slid by putting a hand on the rail.

Then, when the movable weight 15 is moved to the working position of the storage recess 16 in this way, the right area of the storage recess 16 previously blocked by the movable weight 15 is opened, and the work space S is behind the engine 13. Can be secured. In this state, the machinery attached to the right side region P at the rear of the engine 13 is exposed, so that the operator gets on the lower guide groove 14d of the main body weight 14 which is the floor surface of the work space S, and is necessary. A stepladder, a workbench, etc. can be brought in accordingly to perform inspection and repair (maintenance) around the engine in a stable posture. At that time, the movable weight 15 does not move while stopped at the working position, but when the fastener 21 removed earlier is inserted into the holding hole 15b of the movable weight 15 and attached to the corresponding locking hole 14g, the movable weight 15 is attached. Is firmly fixed to the main body weight 14 at the working position to improve safety.

When the maintenance work such as inspection and repair around the engine is completed, the reverse operation of the above may be performed. That is, after the fastener 21 that fixed the movable weight 15 to the work position is attached and detached and the movable weight 15 is released from being fixed to the main body weight 14, the movable weight 15 is stored on the right side from the work position on the left side of the storage recess 16. Move to the normal position. At this time as well, the movable weight 15 can be manually slid to the normal position, and when the movable weight 15 is moved to the normal position, the fastener 21 is attached to the locking hole 14f to move the movable weight 15. It may be fixed to the main body weight 14.

If the work site is large enough to accommodate a crane, it is possible to move the movable weight 15 to the work position of the storage recess 16 and then lift the movable weight 15 with clay to remove it from the main body weight 14. In this case, when the movable weight 15 is moved to the working position of the storage recess 16, the dropout prevention piece 15a of the movable weight 15 is located directly under the notch 14e of the main body weight 14, and is therefore fixed inside the notch 14e. If the stopper member 17 is removed by detaching the fastener, the movable weight 15 can be lifted by clay and removed from the main body weight 14 while passing the fall prevention piece 15a through the notch 14e. At that time, if the handle 20 provided on the movable weight 15 is used as a hanging can, the movable weight 15 can be easily lifted by the crane.

FIG. 8 is a perspective view showing a modified example of the counterweight 12, and FIG. 9 is a perspective view showing a state in which the cover member is removed from the counterweight of FIG. Therefore, the duplicate description will be omitted as appropriate.

As shown in FIG. 8, in the counterweight 12 according to the modified example, the opening and the notch 14e formed in the upper part of the storage recess 16 are covered with the cover member 22, and the cover member 22 is the movable weight 15 at the normal position. It can be attached to the upper surface of the main body weight 14 and the stopper member 17 by using fasteners 23 such as bolts and screws as fastening members, respectively. Further, handles 20 are provided at two locations on the upper surface of the movable weight 15, and mounting holes 15c for receiving the fastener 23 are provided on the left side of the upper surface of the movable weight 15.

The counter weight 12 having such a configuration has a divided structure in which the movable weight 15 is slidably stored in the storage recess 16 of the main body weight 14, but the upper opening and the notch 14e of the storage recess 16 are the cover member 22. Since it is covered with, it is possible to prevent foreign matter from entering the storage recess 16 of the main body weight 14. Further, since the mounting hole 15c exists only on the left side of the upper surface of the movable weight 15 and the mounting hole 15c is not provided on the right side of the upper surface of the movable weight 15, the movable weight 15 is stored in the storage recess 16 as shown in FIG. The cover member 22 can be attached to the movable weight 15 and the main body weight 14 (including the stopper member 17) when the cover member 22 is in the normal position inside. In other words, if the cover member 22 can be attached using the fastener 23, the movable weight 15 is correctly held at the normal position of the main body weight 14, so that the movable weight 15 is covered at the normal position. It can be recognized by the presence of the member 22.

It should be noted that the above-described embodiments are examples for the purpose of explaining the present invention, and the scope of the present invention is not limited to those embodiments. One of ordinary skill in the art can practice the present invention in various other aspects without departing from the gist of the present invention.

For example, in order to stabilize the scaffolding of the worker who got into the work space S, a sheet-shaped anti-slip member is arranged in the lower guide groove 14d of the main body weight 14 which is the bottom surface of the storage recess 16. Is also good.

1 Traveling body 2 Swinging body 3 Working machine 10 Driver's cab 11 Engine room 12 Counterweight 13 Engine 14 Body weight 14a Upper rail 14b Lower rail 14c Upper guide groove 14d Lower guide groove 14e Notch 14f, 14g Locking hole 15 Movable weight 15a Falling prevention piece (falling prevention member)
15b Holding hole 15c Mounting hole 16 Storage recess 17 Stopper member 18, 19 Roller 20 Handle (grip part)
21 Fastener 22 Cover member 23 Fastener (fastener)
100 hydraulic excavator (working machine)
S workspace

Claims (10)

A traveling body capable self, the travel and pivotally mounted on the revolving body on body, and a working machine which is pivotally attached to the front side of the revolving body, an end after said revolving body In a work machine in which a counterweight is installed so as to surround the engine housed inside the engine chamber from the rear.
The counterweight is
The main body weight installed on the swivel body and
It has a movable weight held by the main body weight, and has
The body weight
Housing concavity recessed from the front surface toward the rear, is provided at a position opposed to the engine,
The movable weight is
Is slidably received in Oite lateral direction to the housing recess,
At one end in the left-right direction in the storage recess and in the normal position where the weight of the movable weight is added to the weight of the main body weight, it faces the equipment attached to the engine and requiring maintenance . A work machine characterized by. In the work machine according to claim 1,
The body weight
Rails extending in the left-right direction are provided on at least one side of the storage recess in the up-down direction.
The movable weight has
A work machine characterized in that a roller that rolls on the rail is provided. In the work machine according to claim 2.
The body weight
A guide groove extending in the left-right direction is provided behind the rail in the storage recess.
On the rear surface of the movable weight,
A work machine characterized in that a fall-out prevention member that engages with the guide groove is provided. In the work machine according to claim 3,
On the upper surface of the main body weight,
The upper opening of the housing recess, the notch protruding from the upper opening to the rear, is provided with,
The notch is
It said guide communicates with a space above the groove, the work machine width in the lateral direction, characterized in that it is set larger than the width in the lateral direction of the stopper member. In the work machine according to claim 4,
In the upper space,
A work machine characterized in that a stopper member that prevents the fall-out prevention member from being moved above the main body weight via the notch is detachably attached to a position above the fall-out prevention member. In the work machine according to claim 5.
The body weight
Wherein and a cover member with an upper opening cover and can the cut is disposed in the housing recess,
In the case where the movable weight is in the normal position of the housing recess, wherein the cover member working machine, characterized in that respectively become attachable to the movable weight and the stopper member via a fastening member. In the work machine according to claim 1,
A work machine characterized in that a grip portion is provided on the front surface of the movable weight. In the work machine according to claim 1,
A work machine characterized in that a non-slip member is provided on the lower bottom surface of the storage recess. In the work machine according to claim 1,
A work machine characterized in that the movable weight can be fixed to the main body weight at a plurality of positions in the storage recess. In the work machine according to claim 1,
A work machine characterized in that the dimension of the storage recess in the left-right direction is set to be larger than the width dimension of the engine.

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