JP6919463B2 - Work machine - Google Patents

Description

The present invention relates to a work machine including a body frame provided with a machine room, a work machine mounted on the body frame, and a counterweight, and a battery is housed inside the machine room.

Conventionally, a lower traveling body having a crawler or the like and an upper rotating body (body frame) mounted on the lower traveling body are provided, and various machines (for example, a battery, an engine, an oil pump, etc.) are housed in the upper rotating body. There is a work machine provided with a machine room for this purpose.

As this type of work machine, the body frame, the driver's cab, various work machines (for example, a work machine composed of a boom, an arm, a bucket, etc.), and the movement of the center of gravity due to the weight of the driver's cab and the work machine are suppressed. It is known that a counterweight for this purpose is installed (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2001-315535

By the way, in a conventional work machine as described in Patent Document 1, a cover covering the upper part of the machine room is opened, and the contained material contained in the machine room is taken in and out from the cover. However, the battery, which is one of the contents, is very heavy. Therefore, there is a problem that the battery replacement work becomes very difficult in the case of a configuration such as a conventional work machine in which the replacement work cannot be performed without lifting the contained object.

The present invention has been made in view of the above points, and an object of the present invention is to provide a work machine capable of easily replacing a heavy battery.

The work machine of the present invention
A work machine including a body frame provided with a machine room, a work machine mounted on the body frame, and a counterweight, and a battery is housed inside the machine room.
The side surface of the counterweight is provided with an opening that communicates the inside and the outside of the machine room and allows the battery to pass through when the battery is replaced.
From the lower edge of the opening, a mounting portion integrated with the counterweight on which the battery is mounted extends toward the inside of the machine room.
The upper surface of the above-mentioned mounting portion and the upper surface of the lower edge portion of the opening are formed as continuous surfaces.

Here, the "continuous surface" is not only a flat flat surface and an inclined surface, but also has an influence such as damage to the battery when the battery is moved so as to be dragged in consideration of the size of the battery. Includes a surface with no irregularities.

As described above, in the work machine of the present invention, an opening for battery replacement is provided on the side surface portion or the back surface portion of the counterweight that defines the machine room. Further, a mounting portion extends from the opening toward the inside of the machine room, and the upper surface of the mounting portion and the upper surface of the lower edge of the opening are continuous surfaces.

As a result, the battery can be moved from the inside to the outside or from the outside to the inside by dragging the battery. That is, the heavy battery is not lifted to the upper part of the machine room and is not obstructed by the edge of the opening (specifically, the edge moves or interferes with visual inspection of the installation position, etc.). Can be easily replaced (without becoming).

Further, since the mounting portion extends from the lower edge of the opening, the weight of the counterweight does not significantly decrease or the weight balance does not fluctuate significantly due to the provision of the opening.

Further, in the work machine of the present invention,
It is preferable that the upper surface of the above-mentioned placing portion and the upper surface of the lower edge portion of the opening are formed as a continuous flat surface.

With this configuration, the work can be performed with the same force regardless of whether the battery is taken out or placed, so that the battery replacement work can be performed more easily. become able to.

Further, in the work machine of the present invention,
It is preferable that the upper surface of the above-mentioned mounting portion is provided with a groove or a protrusion that defines the mounting position of the battery.

In this way, the protrusions protruding along the contour shape of the lower surface of the battery on the upper surface of the mounting portion,
If a groove or the like capable of accommodating the protrusions on the lower surface of the battery is provided, the positioning of the battery becomes easy, so that the battery replacement work can be performed more easily.

The side view which shows the structure of the hydraulic excavator which concerns on this embodiment. A perspective view of the hydraulic excavator of FIG. 1 as viewed from above on the rear side. It is a perspective view of the counterweight of the hydraulic excavator of FIG. 1 seen from the rear upper side, FIG. 3A shows a state of only the counterweight, and FIG. 3B shows a state of attaching a battery to the counterweight. It is a rear view which shows the positional relationship between the counterweight of the hydraulic excavator and the battery, FIG. 4A shows the positional relationship in the hydraulic excavator of FIG. 1, and FIG. 4B shows the positional relationship in the conventional hydraulic excavator.

Hereinafter, the hydraulic excavator S, which is a work machine according to the embodiment, will be described with reference to the drawings. In the following description, the front and front sides of the hydraulic excavator S in the traveling direction are simply referred to as "front" and "front side", and the rear and rear sides in the traveling direction are simply referred to as "rear" and "rear side".

In the present embodiment, the hydraulic excavator S is used as an example of the work machine, but the work machine of the present invention is not limited to the hydraulic excavator as long as the machine room is provided in the vehicle body frame. .. For example, it may be a crane car or the like.

As shown in FIGS. 1 and 2, the hydraulic excavator S includes a lower traveling body 1 and an upper rotating body 2 (body frame) rotatably mounted on the lower traveling body 1.

The lower traveling body 1 includes a lower frame 1a and a pair of crawlers 1b provided on both sides of the lower frame 1a. The crawler 1b is driven by a traveling hydraulic motor which is a hydraulic actuator.

The lower traveling body is not limited to the one composed of the lower frame and the crawler, and may be any one provided with a vehicle body frame provided with a machine room. Therefore, the lower traveling body may be one that moves by wheels or one that moves by legs. Further, when the work machine is used on water, the lower traveling body may be a pontoon or the like.

The upper swivel body 2 is provided on the side of the upper frame 2a which is rotatably supported with respect to the lower frame 1a, the cab 2b provided on the front side of the upper frame 2a, and the cab 2b. It has a working machine 2c, a counterweight 2d mounted behind the driver's cab 2b and the working machine 2c, and a machine room 2e defined by an upper frame 2a and a counterweight 2d.

In the driver's cab 2b, the driver operates the hydraulic excavator S such as various levers (not shown) for operating the movement of the work machine 2c, the rotation of the upper swing body 2, and the movement of the lower traveling body 1. Various equipment is provided.

The work machine 2c is rotatably connected to a boom 2c1 rotatably connected to the upper frame 2a of the upper swing body 2, an arm 2c2 rotatably connected to the boom 2c1, and an arm 2c2. It has a bucket 2c3 and a bucket 2c3.

Further, the working machine 2c includes a boom cylinder 2c4 having both ends attached to the upper frame 2a and the boom 2c1 of the upper swing body 2, an arm cylinder 2c5 having both ends attached to the boom 2c1 and the arm 2c2, an arm 2c2, and the arm 2c2. It has a bucket cylinder 2c6 with both ends attached to the bucket 2c3.

The boom 2c1 is rotatably supported by the upper frame 2a of the upper swing body 2, and is rotated by the expansion / contraction operation of the boom cylinder 2c4 with the shaft as a fulcrum. The arm 2c2 is rotatably supported by the boom 2c1, and is rotated by the expansion and contraction operation of the arm cylinder 2c5 with the shaft as a fulcrum. The bucket 2c3 is rotatably supported by the arm 2c2, and is rotated by the expansion and contraction operation of the bucket cylinder 2c6 with the shaft as a fulcrum.

The counterweight 2d maintains the balance of the hydraulic excavator S as a whole with the work machine 2c due to its weight. A space serving as a machine room 2e is formed between the counterweight 2d, the driver's cab 2b, and the working machine 2c.

As shown in FIG. 2, the inside and the outside of the machine room 2e are communicated with each other through an opening 2d1 provided on a side surface of a counterweight 2d mounted on the upper swing body 2. Maintenance of various machines housed in the machine room 2e (for example, replacement of the battery B described later) and the like are performed through the opening 2d1. The opening 2d1 is covered with a panel 2f that can be opened and closed.

Here, the structure of the counterweight 2d will be described in detail.

As shown in FIGS. 1 and 2, the counterweight 2d is mounted on the rear portion of the upper frame 2a and constitutes a portion on the back surface of the hydraulic excavator S. The weight of the counterweight 2d is balanced between the counterweight 2d and the work machine 2c mounted on the upper frame 2a together with the counterweight 2d.

As shown in FIG. 3, the counterweight 2d is an arc-shaped member in a plan view, and is curved so as to substantially coincide with the edge portion of the rear portion of the upper frame 2a (see FIG. 2). In the hydraulic excavator S, by configuring the shape of the counterweight 2d in this way, the amount of protrusion of the rear portion in the horizontal direction is suppressed, and the overall size is reduced.

The counterweight 2d, together with the upper frame 2a, constitutes a machine room 2e on the front inside thereof (see FIGS. 1 and 2). An opening 2d1 that communicates the inside and the outside of the machine room 2e is formed on the side surface of the counterweight 2d for maintenance of various machines housed in the machine room 2e.

As shown in FIG. 3A, a mounting portion 2d2 extends from the lower edge portion of the opening 2d1 toward the inside of the machine room 2e. As shown in FIG. 3B, the battery B is mounted on the mounting portion 2d2.

As shown in FIG. 4A, the height of the upper surface of the mounting portion 2d2 is substantially the same as the height of the upper surface of the lower edge portion of the opening 2d1 (that is, it is a continuous flat surface). There are no steps or gaps at the boundary. Therefore, when the battery B is replaced (removed or installed), the battery B can be moved so as to be pulled out without being lifted high so that the battery B can pass through the opening 2d1.

On the other hand, in the case of the configuration in which the mounting portion 2d2 is not formed as in the reference example shown in FIG. 4B, various machines of the lower edge portion and the upper frame 2a of the upper swing body 2 are provided by the lower edge portion of the opening 2d1. A step is formed between the surface and the mounting surface of the. Therefore, in the configuration of the reference example, when the battery B is replaced, the battery B must be lifted and moved so as to exceed the step.

On the other hand, according to the hydraulic excavator S of the present embodiment, since the mounting portion 2d2 is provided to reduce the influence of the step formed in the opening 2d1 of the counterweight 2d, the effect of the step formed on the counterweight 2d is reduced. The battery B can be easily replaced.

By the way, when the opening 2d1 is provided in the counterweight 2d, the weight of the counterweight 2d becomes lighter by the weight of the member removed from the counterweight 2d in order to form the opening 2d1.

Therefore, in the hydraulic excavator S of the present embodiment, by extending the mounting portion 2d2 from the lower edge portion of the opening 2d1, the weight of the mounting portion 2d2 is also the same as that of the other parts of the counterweight 2d. It is used as the weight for balancing the weight of the hydraulic excavator S.

As a result, in the hydraulic excavator S, the influence of the weight reduction of the counterweight 2d due to the provision of the opening 2d1 in the counterweight 2d is suppressed, and the weight balance is improved.

Further, as shown in FIGS. 3A and 4A, a positioning protrusion 2d3 having a shape protruding along the contour shape of the lower surface portion of the battery B is formed at the mounting position of the battery B in the mounting portion 2d2. In the hydraulic excavator S, since the mounting position of the battery B is defined by such a positioning protrusion 2d3, the positioning work when replacing the battery B can be easily performed, and the replacement work of the battery B can be performed in a short time. It is easier to do with.

The positioning projection 2d3 may be appropriately changed according to the shape of the battery B. For example, when a protrusion is formed on the lower surface of the battery B, it may be formed as a groove in which the protrusion is accommodated, or may be a pattern. Further, when there is another structure (for example, a frame for fixing the battery B) that can be used for positioning the battery B in the vicinity of the battery B, the positioning projection 2d3 may be omitted.

Although the illustrated embodiment has been described above, the present invention is not limited to such an embodiment.

For example, in the above embodiment, the upper surface of the mounting portion 2d2 and the upper surface of the lower edge portion of the opening 2d1 are set so that the height of the mounting portion 2d2 and the height of the lower edge portion of the opening 2d1 substantially match. It is a continuous plane. This is so that the work can be performed with the same force regardless of whether the battery B is taken out or placed.

However, the upper surface of the mounting portion of the present invention and the upper surface of the lower edge portion of the opening of the counterweight do not necessarily have to be continuous flat surfaces. For example, it may be a continuously inclined surface or a surface having irregularities that can be ignored with respect to the size of the battery.

Further, for example, in the above embodiment, the opening 2d1 is formed on the side surface of the counterweight 2d. However, the opening of the present invention may be provided on the back surface of the counterweight.

1 ... Lower traveling body, 1a ... Lower frame, 1b ... Crawler, 2 ... Upper swivel body (body frame), 2a ... Upper frame, 2b ... Driver's cab, 2c ... Working machine, 2c1 ... Boom, 2c2 ... Arm, 2c3 ... Bucket, 2c4 ... Boom cylinder, 2c5 ... Arm cylinder, 2c6 ... Bucket cylinder, 2d ... Counterweight, 2d1 ... Opening, 2d2 ... Mounting part, 2d3 ... Positioning protrusion, 2e ... Machine room, 2f ... Panel, B ... Battery , S ... Hydraulic excavator.

Claims (3)

A work machine including a body frame provided with a machine room, a work machine mounted on the body frame, and a counterweight, and a battery is housed inside the machine room.
The side surface of the counterweight is provided with an opening that communicates the inside and the outside of the machine room and allows the battery to pass through when the battery is replaced.
From the lower edge of the opening, a mounting portion integrated with the counterweight on which the battery is mounted extends toward the inside of the machine room.
A work machine characterized in that the upper surface of the above-mentioned placing portion and the upper surface of the lower edge portion of the opening are formed as continuous surfaces. In the work machine according to claim 1,
A work machine characterized in that the upper surface of the above-mentioned placing portion and the upper surface of the lower edge portion of the opening are formed as a continuous flat surface. In the work machine according to claim 1 or 2.
A work machine characterized in that a groove or a protrusion that defines a mounting position of the battery is provided on the upper surface of the above-described mounting portion.

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