JP5225613B2 - Work machine counterweight - Google Patents

Description

  The present invention relates to a counterweight of a work machine, and more particularly, to a counterweight of a work machine having an additional counterweight that increases the weight of a main counterweight.

  2. Description of the Related Art Conventionally, work machines such as power shovels have a configuration in which a main counterweight is provided at the rear end of an upper swing body that supports a work machine. The weight of the main counterweight counters the moment generated by the work load.

  Furthermore, in recent work machines, a work machine in which an additional counterweight is detachably arranged with respect to the main counterweight described above in order to cope with a change in work load accompanying a change in specifications or a change in work machine. Is also provided.

  As a work machine in which the additional counterweight is detachably disposed, the following work machines have been proposed depending on the place where the additional counterweight is installed. As a configuration in which an additional counter weight is arranged on the outer side of the main counter weight so as to protrude outward, a weight of a turning work machine (see Patent Document 1) has been proposed. Further, as a configuration in which additional counter weights are stacked on the upper surface of the main counter weight, a construction machine counter weight (see Patent Document 2) has been proposed.

Further, as a configuration in which an additional counterweight is disposed inside the main counterweight, a counterweight mounting structure (see Patent Document 3) has been proposed.
The counterweight of the construction machine described in Patent Document 2 is the prior art 1 of the present invention, and FIG. 14 is an exploded perspective view showing the main parts of the main counterweight and the additional counterweight.

  As shown in FIG. 14, the additional counterweight 34 is configured by cutting an iron plate made of waste iron material, and can be stacked on the upper surface portion 33 of the main counterweight 32. The stacked additional counterweight 34 can be fixed to the main counterweight 32 with a bolt 35. The additional counterweight 34 is made of waste iron material to reduce the manufacturing cost of the additional counterweight 34.

  Further, the mounting structure of the counterweight described in Patent Document 3 is the conventional technique 2 of the present invention, and FIG. 15 shows a side view of the main part of the upper swing body.

As shown in FIG. 15, in the upper swing body 40, a mounting chamber 43 for placing auxiliary counterweights 45 to 47 is provided between the main counterweight 41 and the engine chamber 42. The auxiliary counterweights 45 to 47 are overlapped on the upper surface portion of the frame 44 in the mounting chamber 43.
JP 2005-307560 A JP 2002-146842 A Japanese Patent Laid-Open No. 7-310335

  As described in Patent Document 1, if the additional counterweight is disposed on the outer surface of the main counterweight so as to protrude from the outer surface, there arises a problem that the swivel region of the upper swing body expands outward. Further, since the rear end portion of the upper swing body protrudes outward by the additional counterweight, a part of the rear field of view seen from the driver's seat is blocked by the additional counterweight 34 protruding outward. Become.

  As described in Patent Document 2, when the additional counterweight 34 is stacked on the upper surface portion 33 of the main counterweight 32, a part of the rear view seen from the driver's seat is blocked by the stacked additional counterweight 34. It will end up.

  Moreover, in the thing of patent document 2, in order to reduce the area | region of the rear view which is interrupted by the additional counterweight 34, if the height of the additional counterweight 34 is comprised low, the weight as the additional counterweight 34 will become small. End up. Further, an additional counterweight 34 is configured by cutting an iron plate made of waste iron material, but the additional counterweight 34 has a single shape as shown in FIG. The weight cannot be adjusted arbitrarily.

  In the device described in Patent Document 3, since the additional counterweights 45 to 47 are arranged inside the main counterweight 41, the turning region of the upper swing body 40 is outside by the additional counterweights 45 to 47. Can be prevented from spreading. However, in order to arrange the additional counterweights 45 to 47, a dedicated mounting chamber 43 must be formed between the main counterweight 41 and the engine chamber.

  In addition, in order to arrange the additional counterweights 45 to 47 in the mounting chamber 43, the size of the mounting chamber 43 must be larger than the additional counterweights 45 to 47. For this reason, by configuring the mounting chamber 43, the length of the upper swing body 40 in the front-rear direction is increased. Therefore, the configuration of the upper swing body 40 is increased in size, and the swing area of the upper swing body 40 is also expanded.

  In particular, in a working machine such as a small hydraulic excavator that requires a compact design, the upper swing body cannot be configured compactly. In addition, it is a big problem that the upper revolving unit cannot be configured compactly and the swivel region of the upper revolving unit is widely configured outside.

  The present invention solves these problems, and even in a small work machine, the counterweight of the work machine provided with an additional counterweight that increases the weight of the main counterweight in a state where the upper swing body is compactly configured. It is to provide.

The object of the present invention can be achieved by the inventions described in claims 1 and 2.
That is, in the present invention, in the counterweight of the work machine comprising a main counterweight disposed at the rear end of the upper swing body and an additional counterweight that increases the weight of the main counterweight,
The additional counterweight is configured by stacking a plurality of types of steel plates having different outer peripheral edge shapes in plan view, and the additional counterweight is stacked by appropriately combining the plurality of types of steel plates. it allows avoiding member which protrudes from said main counterweight, is configured in a shape having an outer peripheral surface shape following the inner wall surface shape of the main counterweight formed in the recess shape,
The most important feature is that the additional counterweight is detachably attached to the revo frame.

Moreover, in this invention, it has made it the main characteristics that the some steel plate specified the structure mounted and fixed on the revo frame via the nut and the attachment bolt .

According to the present invention, the additional counterweight can be disposed following the shape of the inner wall surface of the main counterweight. Therefore, the additional counterweight can be disposed in the space formed on the inner peripheral surface side of the main counterweight. it can. In addition, the shape of the additional counterweight can be configured to have an outer peripheral surface shape that follows the inner wall surface shape of the main counterweight formed in a concave shape, avoiding the members protruding from the main counterweight. For this reason, an additional counterweight can be attached to the upper swing body without changing the size of the upper swing body.

Moreover, by arranging a plurality of types of steel plates having different outer peripheral edge shapes , it is possible to effectively utilize the space formed on the inner peripheral surface side of the main counterweight and to laminate the steel plates so as to fill the space. it can. Moreover, the weight of the additional counterweight can be adjusted by adjusting the number of steel plates to be loaded. And the space formed in the inner peripheral surface side of the main counterweight can be used effectively.

  Further, since the additional counter weight can be detachably attached to the main counter weight or the revo frame via the attachment bolt, the additional counter weight can be easily attached to and detached from the upper swing body.

When the opening for inserting the steel plates to be laminated is formed at the bottom of the revo frame, it is possible to easily attach the additional counterweight to the upper swing body. That is, even if the inner peripheral surface side of the main counterweight is not released from the upper side, it is possible to easily attach and remove the additional counterweight to the upper swing body.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view showing a main part of a main counterweight mounted on a revolving frame of an upper swing body, and FIGS. 2 and 3 are front views of the main counterweight as viewed from the front side. FIG. 2 shows a state before the additional counter weight is attached, and FIG. 3 shows a state where the additional counter weight is attached.

  4 and 8 show plan views of the respective steel plates constituting the additional counterweight, and FIGS. 5, 6 and 9 show plan views when the steel plates are laminated. Moreover, FIG. 7, FIG. 10 has shown the perspective view of the laminated steel plate. FIG. 11 shows a perspective view of a mounting plate used for mounting the laminated steel plates on the revo frame.

  Although the hydraulic excavator itself according to the present embodiment is not shown, the upper swing body 3 according to the present invention is mounted on a small hydraulic excavator model capable of a small backward swing of about 1.5 tons. The upper swing body 3 will be described as an example. However, the upper swing body 3 according to the present invention is not limited to the upper swing body mounted on a hydraulic excavator of about 1.5 tons, and does not hinder the application of the present invention to various work vehicles. Absent.

  FIG. 1 shows a perspective view of the main part of the upper swing body 3. In FIG. 1, illustration of a work machine, a canopy, an engine, a fuel tank, a swing device and the like mounted on the upper swing body 3 is omitted. Yes. Also, although not shown in the figure, the upper swing body 3 on which an operator gets on and performs work is pivotably attached to the upper part of the lower travel body around which a crawler belt for moving travel is wound. ing.

  A revo frame 4 and a main counterweight 5 as a swing frame serving as a base are disposed at the lower part of the upper swing body 3. The main counterweight 5 is integrally fixed to the rear portion of the revo frame 4 in order to balance the front and rear weight with respect to a working machine (not shown). A lower exterior panel (not shown) is disposed on the upper portion of the revo frame 4 and forms the outer surface of the vehicle body.

  The main counterweight 5 is formed with a canopy mounting seat 7 for installing a canopy (not shown). The cab is composed of canopies. On the revo frame 4, a space for storing an engine, a fuel tank, and the like is formed. An area on the front side of the main counterweight 5 is formed as an engine mounting area 8.

  The inner wall surfaces 5a and 5b as shown in FIG. 2 are formed on the front side of the main counterweight 5 facing the engine (not shown) mounted in the engine mounting area 8, and the inner wall surfaces 5a and 5b are recessed inward. It is formed in a concave shape. In the present invention, the additional counterweight 10 is configured to be attached by effectively utilizing the space formed between the inner wall surfaces 5a, 5b formed in the concave shape and the engine.

That is, the additional counterweight 10 includes steel plates 11a to 11d and steel plates 13a to 13c having different shapes as shown in FIGS. 4 (a) to 4 (d) and FIGS. 8 (a) to 8 (c). It is constituted by appropriately combining Rukoto. Different outer peripheral shapes so that the steel plates 11a to 11d and the steel plates 13a to 13c can be stacked in the space formed between the inner wall surfaces 5a and 5b formed in the recessed shape and the engine. It is comprised as a steel plate which has. Further, as shown in FIGS. 4A and 8A, bolt insertion holes 12 and 14 into which a mounting bolt 18 described later can be inserted are formed in some steel plates. If necessary, the bolt insertion holes 12 and 14 can be formed in all the steel plates.

  FIG. 7 is a perspective view showing a state in which the steel plates 11a to 11d shown in FIGS. 4 (a) to 4 (d) are stacked. A top view in FIG. 7 is shown in FIG. 5, and a bottom view in FIG. 7 is shown in FIG. Moreover, the perspective view which shows the state which laminated | stacked each steel plate 13a-13c shown in Fig.8 (a)-FIG.8 (c) is shown in FIG. A top view in FIG. 10 is shown in FIG. 9A, and a bottom view in FIG. 10 is shown in FIG. 9B.

Since the steel plates 11a to 11d and the steel plates 13a to 13c are configured to have different outer peripheral edge shapes , the steel plates 11a to 11d and the steel plates 13a to 13c are appropriately combined to form the main counterweight 5. The steel plates can be stacked along the inner wall surfaces 5a and 5b formed in the concave shape while avoiding the members 19a and 19b (see FIG. 2).

  As shown in FIG. 1, a predetermined number of steel plates 11d and 11e are stacked on the revo frame 4 while avoiding the member 19a (see FIG. 2), and the steel plate 11a is mounted on the mounting bolt 18 erected from the revo frame 4. A predetermined number of sheets are laminated while passing through the bolt insertion holes 12. The laminated steel plates 11d and 11e can prevent interference between the steel plate 11a and the member 19a. When a predetermined number of steel plates 11a are stacked, a predetermined number of steel plates 11b are stacked thereon. Then, while preventing the collapse of the steel plate 11b using the mounting plate 15, the mounting bolt 18 is inserted into the bolt insertion hole 15a formed in the mounting plate 15, and the nut 20 is screwed to the mounting bolt 18 to form a stack. The obtained steel plates 11a to 11d can be fixed to the revo frame 4.

  Similarly, as shown in FIG. 1, a predetermined number of steel plates 13c are stacked on the revo frame 4 while avoiding the member 19b (see FIG. 2), and the mounting bolts 18 are provided with the steel plates 13a standing on the revo frame 4. A predetermined number of layers are laminated while passing through the bolt insertion holes 14. The laminated steel plates 13c can prevent interference between the steel plates 13a and the members 19b. When a predetermined number of steel plates 13a are stacked, a predetermined number of steel plates 13b are stacked thereon. Then, while preventing the collapse of the steel plate 13b using the mounting plate 15, the mounting bolt 18 is inserted into the bolt insertion hole 15a formed in the mounting plate 15, and the nut 20 is screwed into the mounting bolt 18 to form a stack. The obtained steel plates 13a to 13c can be fixed to the revo frame 4.

  Since these steel plates 11a to 11d and the steel plates 13a to 13c are laminated along the inner wall surfaces 5a and 5b formed in the concave shape, respectively, the steel plates 11a to 11d and the steel plates 13a to 13a are running or traveling during the vehicle. 13c can be prevented from collapsing and moving. As described above, the additional counterweight 10 can be attached by effectively using the space formed between the main counterweight 5 and the engine.

  In the above description, the example in which the mounting bolt 18 is installed upright and fixed to the revo frame 4 has been described. However, a hole through which the mounting bolt 18 is inserted is formed in the revo frame 4, and the mounting bolt 18 is attached to the additional counterweight 10. It is also possible to adopt a mounting structure that is inserted from the side of the mounting plate 15 disposed in the upper portion and screwed to the nut on the bottom surface side of the revo frame 4. Alternatively, the mounting structure may be such that the mounting bolt 18 is not inserted from the mounting plate 15 side but is inserted from the bottom surface side of the rebo frame 4 and screwed to the nut on the top surface of the mounting plate 15.

  A configuration in which the additional counterweight 10 according to the present invention is stacked from below the revo frame 4 will be described with reference to FIGS. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and the description thereof is omitted.

  In the second embodiment, the mounting plate 16 is fixed to the main counterweight 5 and the mounting bolts 18 are inserted from the bolt mounting holes 16a formed in the mounting plate 16 to form the bottom surface of the rebo frame 4 (not shown). The steel plates 11a to 11d and the steel plates 13a to 13c are inserted sequentially from the opening, and the inserted steel plates 11a to 11d and the steel plates 13a to 13c are fixed in a suspended manner by the mounting bolts 18. In order to prevent the steel plates 11d and 11e in FIG. 6 from falling, the support plate can be arranged on the lower surface side of the steel plates 11d and 11e and the support plate can be fixed with the mounting bolts 18.

  The order in which the steel plates 11a to 11d and the steel plates 13a to 13c are inserted from openings (not shown) formed in the bottom surface of the revo frame 4 is the same as that of the revo frame 4 in the steel plates 11a to 11d and the steel plates 13a to 13c described in the first embodiment. It can be performed in the reverse order to the case of stacking on top. The additional counterweight 10 can be attached and removed from the bottom side of the revo frame 4, so if there is enough space to be able to sink into the bottom side of the work vehicle at any work location, the additional counterweight 10 Can be attached and removed.

  In Examples 1 and 2, an example in which an additional counterweight is configured using a single steel plate is not described. However, a single steel plate having a desired thickness can be configured in the shape shown in FIGS. 7 and 10, and this steel plate can be disposed along the inner wall surfaces 5 a and 5 b of the main counterweight 5. . At this time, a single steel plate having a desired thickness and the shape shown in FIGS. 7 and 10 may be integrated to form a single steel plate having a desired thickness. The shapes shown in FIG. 10 can be configured separately.

  Furthermore, a single steel plate having a desired thickness, a plurality of steel plates shown in FIGS. 4 and 8 each having a shape in which a predetermined number of each steel plate is individually laminated, are prepared. By stacking, the additional counterweight can be configured in the shape shown in FIGS.

  As an application example of the present invention, a hydraulic excavator has been exemplified as a work vehicle. However, the present invention can be effectively applied to other work vehicles other than a hydraulic excavator having a similar configuration.

It is a principal part perspective view of an upper revolving structure. Example 1 It is a front view of the main counterweight before attaching an additional counterweight. Example 1 It is a front view of the main counterweight in the state where an additional counterweight is attached. Example 1 It is a top view of the steel plate which comprises an additional counterweight. (Example) It is a top view in the state which laminated | stacked each steel plate of FIG. (Example) It is a bottom view in the state which laminated | stacked each steel plate of FIG. (Example) It is the perspective view which laminated | stacked each steel plate of FIG. (Example) It is a top view of the other steel plate which comprises an additional counterweight. (Example) It is the top view and bottom view in the state which laminated | stacked each steel plate of FIG. (Example) It is the perspective view which laminated | stacked each steel plate of FIG. (Example) It is a perspective view of a mounting plate. Example 1 It is a principal part perspective view of an upper revolving structure. (Example 2) It is a perspective view of a mounting plate. (Example 2) It is a perspective view which shows the relationship between a main counterweight and an additional counterweight. (Conventional example 1) It is principal part sectional drawing of an upper revolving body. (Conventional example 2)

Explanation of symbols

3 ... upper revolving structure,
4 ... Revo frame (swivel frame),
5 ... Main counter weight,
5a ... inner wall surface (inner wall surface of main counterweight),
5b ... inner wall surface (inner wall surface of main counterweight),
8 ... Engine mounting part,
10: Additional counter weight,
11a-11d ... steel plate,
13a-13c ... steel plate,
15 ... Mounting plate,
16 ... Mounting plate,
32 ... main counter weight,
33 ... upper surface,
34 ... Additional counter weight,
40 ... upper revolving structure,
41 ... main counterweight,
42 ... engine room,
43 ... Mounting chamber,
44 ... frame,
45 to 47: Holding counter weight.

Claims (2)

In a counterweight of a work machine comprising a main counterweight disposed at the rear end of the upper swing body and an additional counterweight that increases the weight of the main counterweight,
The additional counterweight is constituted by laminating a plurality of types of steel plates having different outer peripheral edge shapes in plan view in combination,
The additional counterweight has an outer periphery that follows the inner wall surface shape of the main counterweight formed in a concave shape by avoiding members protruding from the main counterweight by laminating the plurality of types of steel plates in an appropriate combination. Consists of a shape having a surface shape,
A counterweight for a work machine, wherein the additional counterweight is detachably attached to a revo frame. Among the plurality of stacked steel plates, at least one steel plate has a bolt insertion hole for inserting a mounting bolt,
The counterweight according to claim 1, wherein the additional counterweight is mounted and fixed on the revo frame via a nut and the mounting bolt.

Images