JP5395750B2 - Construction machinery - Google Patents

Description

  The present invention relates to a construction machine such as a mini excavator in which a fuel tank is disposed adjacent to a hydraulic oil tank on a revolving structure.

  2. Description of the Related Art Conventionally, a construction machine, for example, a mini excavator of less than 6 tons includes a traveling body, a revolving body disposed on the traveling body, and a boom, an arm, a bucket, and the like attached to the revolving body so as to be pivotable in the vertical direction. Device. Further, such a mini excavator includes a hydraulic oil tank disposed on the revolving body, a fuel tank disposed adjacent to the hydraulic oil tank, and an arrangement space of the hydraulic oil tank and the fuel tank on the revolving body. And an outer cover that forms the outer peripheral wall of the swivel body. A hydraulic oil tank and a fuel tank are arranged between the inner peripheral wall of the exterior cover and the inner cover.

  By the way, the shape of the hydraulic oil tank is often restricted because it is made of sheet metal. On the other hand, since the fuel tank can be resin-molded, the shape of the fuel tank is less restricted than the hydraulic oil tank, and the degree of freedom in design is high. For this reason, in a small machine such as a mini excavator, a resin fuel tank having a capacity necessary for a limited arrangement space on the revolving structure is arranged in a shape that allows close contact with surrounding components. Things have been done. Therefore, between the different types of mini excavators, that is, between the revolving bodies having different shape dimensions, fuel tanks having different shape dimensions are manufactured according to the shape dimensions of each revolving body.

  Although different from construction machines, Patent Document 1 discloses a fuel tank for a motorcycle. The fuel tank disclosed in Patent Document 1 is made of resin, and is formed by joining an upper tank and a lower tank. That is, in this prior art, one fuel tank is manufactured using a mold for an upper tank and a mold for a lower tank.

JP 2008-238901 A

  In a construction machine such as a mini excavator or the like that is constrained by the installation space of the fuel tank, in order to place the fuel tank in close contact with the surrounding parts on the revolving structure, the fuel as shown in Patent Document 1 It is conceivable to manufacture the tank in two parts made of resin. However, two molds are required to divide into two parts. In other words, each time the construction machine model (the shape and size of the revolving structure) is different, two molds for individually manufacturing the fuel tank are required. Therefore, when considering a plurality of different types of construction machines, the total number of molds for manufacturing the fuel tank increases, and the cost for the molds, that is, the cost for manufacturing the fuel tank increases. There is a problem that the production cost of each model becomes high.

  The present invention was made from the actual situation in the above-described prior art, and its purpose is to reduce the total number of fuel tank molds provided in each of a plurality of different models when considering the production of a plurality of different models. It is to provide a construction machine that can.

  In order to achieve this object, a construction machine according to the present invention includes a revolving structure, a working device attached to the revolving structure, a hydraulic oil tank disposed on the revolving structure, and a hydraulic oil tank. In a construction machine comprising: a fuel tank provided; an inner cover provided on the swivel body; an inner cover that defines an arrangement space for the hydraulic oil tank and the fuel tank; and an outer cover that forms an outer peripheral wall of the swirl body. The fuel tank is made of a resin in which a first divided portion and a second divided portion are joined to each other, and the first divided portion is disposed in proximity to the hydraulic oil tank and the exterior cover and includes the construction machine. Each of the plurality of construction machines having different outer shapes of the revolving structure is formed in an invariable shape and dimension, and the second divided portion is adjacent to the inner cover. Is location, is characterized by consisting of those formed in specific geometry corresponding to the geometry of the revolving body of the construction machine.

  In the present invention configured as described above, when manufacturing a plurality of models having different shapes and dimensions of the revolving structure, the shape of the outer cover and the shape of the hydraulic oil tank are the same or substantially the same for each of the plurality of different models. Preset the shape and place the first divided part of the fuel tank to be molded in the vicinity of the hydraulic oil tank and the outer cover, and this inner cover on the inner cover side which is easily affected by the arrangement of surrounding parts If the second divided portion is arranged in the vicinity of the fuel tank, the first divided portion of the fuel tank can be formed by a shared mold for each of a plurality of different models. That is, only the second divided portion of the fuel tank can be formed by a dedicated mold corresponding to the size and shape of the turning body of the construction machine. Thereby, when each production of a plurality of different models is considered, the total number of molds for the fuel tank can be reduced.

  According to the present invention, in the above invention, the joining surface of the first divided portion and the second divided portion of the fuel tank is formed of a surface including a center line of a cylindrical portion forming a fuel filler port of the fuel tank. It is characterized by.

  Further, the present invention, in the above invention, comprises a mini excavator provided with a swing cylinder for rotating the working device in the left-right direction, on the side of the hydraulic oil tank on the side of the inner cover, and below the fuel tank. In addition, an arrangement space for the swing cylinder is provided.

  Further, the present invention is the above invention, wherein the fuel tank includes a first shape portion located on the exterior cover side, and is located on the inner cover side in communication with the first shape portion, and the swing cylinder is disposed below the swing cylinder. And a second shape part that forms the arrangement space.

  Further, the present invention is characterized in that in the above invention, a belt is provided for pressing the second shape portion of the fuel tank so that the fuel tank comes into contact with the hydraulic oil tank.

  In the construction machine according to the present invention, the fuel tank disposed on the revolving structure and provided adjacent to the hydraulic oil tank is made of a resin in which the first divided portion and the second divided portion are joined to each other, and the first divided portion is , An invariable shape that is disposed in the vicinity of the outer cover that forms the outer peripheral wall of the hydraulic oil tank and the swivel body, and is shared by each of a plurality of construction machines including the construction machine having different outer shapes. Since the second divided portion is disposed in the vicinity of the inner cover and is formed to have a specific shape according to the shape of the swivel of the construction machine, When manufacturing a plurality of models having different shape dimensions of the revolving structure, the first divided portion of the fuel tank can be formed by a shared mold for each of the plurality of models. Thus, when considering the production of a plurality of different models, the total number of fuel tank molds can be reduced, and the cost required for the fuel tank molds, that is, the production cost of the fuel tank can be suppressed. Therefore, it is possible to reduce the production cost of each of a plurality of different models as compared to the conventional case.

It is a side view which shows the mini excavator which comprises 1st Embodiment of the construction machine which concerns on this invention. It is a top view which shows the main structures of the mini excavator which concerns on 1st Embodiment shown in FIG. FIG. 3 is an enlarged view of a main part of FIG. 2. It is a principal part perspective view of the mini excavator which concerns on 1st Embodiment shown in FIG. It is a principal part enlarged view of FIG. It is a figure which shows the fuel tank with which the mini excavator which concerns on 1st Embodiment shown in FIG. 1 is equipped, (a) A figure is a top view, (b) A figure is a perspective view. It is a figure which shows the fuel tank with which the mini excavator which concerns on 1st Embodiment shown in FIG. 1 is equipped, (a) A figure is a bottom view, (b) A figure is a side view. It is a top view which shows the main structures of the mini excavator which comprises 2nd Embodiment of the construction machine which concerns on this invention. It is a principal part perspective view of the mini excavator which concerns on 2nd Embodiment shown in FIG. It is a figure which shows the fuel tank with which the mini excavator which concerns on 2nd Embodiment shown in FIG. 8 is equipped, (a) A figure is a top view, (b) A figure is a perspective view. It is a figure which shows the fuel tank with which the mini excavator which concerns on 2nd Embodiment shown in FIG. 8 is equipped, (a) A figure is a bottom view, (b) A figure is a side view.

  Embodiments of a construction machine according to the present invention will be described below with reference to the drawings.

  1 is a side view showing a mini excavator constituting a first embodiment of a construction machine according to the present invention, FIG. 2 is a plan view showing a main configuration of the mini excavator according to the first embodiment shown in FIG. 1, and FIG. 2 is an essential part enlarged view, FIG. 4 is a principal part perspective view of the mini excavator according to the first embodiment shown in FIG. 1, and FIG. 5 is an essential part enlarged view of FIG.

  As shown in FIG. 1, the mini excavator 1 according to the first embodiment is attached to a traveling body 2, a revolving body 3 disposed on the traveling body 2, and the revolving body 3 so as to be rotatable in the vertical direction. And a working device 4 including a boom 4a, an arm 4b, and a bucket 4c, and a blade 5. A driver's cab 6 is arranged on the revolving unit 3.

  As shown in FIGS. 2 and 3, a swing post 9 and a swing cylinder 10 that rotate the working device 3 in the left-right direction are disposed on the revolving frame 8 of the revolving structure 3 at the front side position. In addition, an engine 11 and a hydraulic pump 20 that is driven by the engine to drive the traveling body 2 and supplies pressure oil that operates the work device 4 are disposed at a rear position on the turning frame 8. It is. Further, a heat exchanger, that is, a radiator 12 and an oil cooler 13 are arranged on the right side of the engine 11 on the revolving frame 8. A battery 14 is disposed on the right side of the oil cooler 13. Below the cab 6 described above, a control valve 18 for controlling the flow of pressure oil supplied from the hydraulic pump 20 to an actuator such as a travel actuator and an actuator for a work device is disposed. In the arrangement space 30 formed by the exterior cover 7 forming the outer peripheral wall of the revolving structure 3, the partition plate 23 close to the battery 14, and the inner cover 22 disposed on the inner side of the revolving structure 3, an oil cooler is provided. A hydraulic oil tank 16 to which an oil cooler pipe 15 connected to 13 is connected, and a fuel tank 17 for storing fuel of the engine 11 are arranged close to each other.

  6 and 7 are views showing a fuel tank provided in the mini-excavator according to the first embodiment shown in FIG. 1. FIG. 6 (a) is a plan view, FIG. 6 (b) is a perspective view, and FIG. a) The figure is a bottom view and (b) the figure is a side view.

  As shown in FIGS. 6 and 7, the fuel tank 17 is made of a resin in which a first divided portion 17A and a second divided portion 17B are joined to each other. As shown in FIGS. 3 and 5, the first divided portion 17 </ b> A of the fuel tank 17 is disposed in the vicinity of the hydraulic oil tank 16 and the exterior cover 7, and includes the external dimensions of the revolving structure 3 including the mini excavator 1. Are formed to have an invariable shape and dimension shared by a plurality of different models, that is, a plurality of mini excavators of different models. The first divided portion 17A is formed by a shared mold (not shown) that is shared when manufacturing a plurality of different models. As shown in FIGS. 3 and 5, the second divided portion 17 </ b> B of the fuel tank 17 is disposed in the vicinity of the inner cover 22 and has a specific shape and size corresponding to the shape and size of the swing body 3 of the mini excavator 1. Is formed. The second divided portion 17B is formed by a dedicated die (not shown) unique to the production of the mini excavator 1.

  As shown in FIG. 6, the joint surface 17 </ b> C between the first divided portion 17 </ b> A and the second divided portion 17 </ b> B of the fuel tank 17 is a surface including the center line of the cylinder portion 17 </ b> D that forms the fuel filler opening of the fuel tank 17. . The joint surface 17C corresponds to a contact surface between a shared mold (not shown) that molds the first divided portion 17A and a dedicated mold (not shown) that molds the second divided portion 17B.

  Further, the fuel tank 17 is disposed on the outer cover 7 side, the first shape portion 17E is located on the inner cover 22 side and communicated with the first shape portion 17E, and the swing cylinder 10 shown in FIG. 2nd shape part 17F which forms the space 31 is included. The swing cylinder 10 is housed in a space formed by the second shape portion 17F of the fuel tank 17, the left side of the hydraulic oil tank 16, and the inner cover 22.

  In the first embodiment, as shown in FIG. 5 and the like, the second shape portion 17F of the fuel tank 17 is pressed so that the fuel tank 17 disposed on the revolving frame 8 contacts the hydraulic oil tank 16. The belt 40 is provided. The lower end of the belt 40 is fixed to a bracket 41 that is provided on the revolving frame 8 and is attached to the mount 21 on which the second shape portion 17F of the fuel tank 17 is held. The upper end of the belt 40 is attached to the side surface of the hydraulic oil tank 16. The bracket 42 is fixed via a nut 43 that is screwed into a screw portion provided at the upper end of the belt 40. By rotating the nut 43, the pressing force of the belt 40 is applied to the fuel tank 17.

  FIG. 8 is a plan view showing a main configuration of a mini-excavator constituting the second embodiment of the construction machine according to the present invention, and FIG. 9 is a perspective view of a main part of the mini-excavator according to the second embodiment shown in FIG.

  The swivel body according to the second embodiment shown in FIGS. 8 and 9 is the swivel body of the mini excavator 1 according to the first embodiment shown in FIGS. 1 and 2 in which the outer shape of the swivel body 3A including the swivel frame 8A is described above. 3 is set to be larger than the external dimension of 3. However, the shape of the exterior cover 7 that forms the outer peripheral wall of the swivel body 3A and the shape of the hydraulic oil tank 16 disposed on the swivel frame 8A are the same as those in the mini excavator 1 according to the first embodiment, or They are set approximately the same. The inner cover 22A has a considerably different shape from the inner cover 22 in the first embodiment in relation to the surrounding component arrangement. Although not shown, various devices similar to those in the first embodiment are arranged on the swing body 3A.

  10 and 11 are views showing a fuel tank provided in the mini excavator according to the second embodiment shown in FIG. 8, wherein FIG. 10 (a) is a plan view, FIG. 10 (b) is a perspective view, and FIG. a) The figure is a bottom view and (b) the figure is a side view.

  As shown in FIGS. 10 and 11, the fuel tank 37 provided in the mini excavator according to the second embodiment is also divided into the first division in the same manner as the fuel tank 17 provided in the mini excavator 1 provided in the first embodiment. The portion 37A and the second divided portion 37B are made of a resin joined together. As shown in FIGS. 8 and 9, the first divided portion 37 </ b> A of the fuel tank 37 is disposed close to the hydraulic oil tank 16 and the exterior cover 7, and is the same as the first divided portion 17 </ b> A of the fuel tank 17 described above. It is formed in a shape and dimension, and is formed by a shared mold for forming the first divided portion 17A of the fuel tank 17 described above.

  As shown in FIGS. 8 and 9, the second divided portion 37 </ b> B of the fuel tank 37 provided in the second embodiment is disposed close to the inner cover 22 </ b> A and corresponds to the shape and size of the swing body 3 </ b> A of the mini excavator. It has a unique shape and dimension. The second divided portion 37B has a larger shape and dimension than the second divided portion 17B of the fuel tank 17 provided in the mini excavator 1 according to the first embodiment. The second divided portion 37B is formed by a dedicated mold (not shown) unique to the manufacture of the mini excavator according to the second embodiment.

  As shown in FIG. 10, the joint surface 37 </ b> C of the first divided portion 37 </ b> A and the second divided portion 37 </ b> B of the fuel tank 37 is a surface including the center line of the cylinder portion 37 </ b> D that forms the fuel filler opening of the fuel tank 37. . This is the same as the fuel tank 17 provided in the mini excavator 1 according to the first embodiment.

The fuel tank 37 provided in the second embodiment also has a first shape portion 37E located on the exterior cover 7 side, and is located on the inner cover 22A side in communication with the first shape portion 37E. And a second shape portion 37 </ b> F that forms ten arrangement spaces 31.

  Further, as shown in FIG. 9, the second embodiment also includes a belt 45 that presses the second shape portion 37 </ b> F of the fuel tank 37 so that the fuel tank 37 contacts the hydraulic oil tank 16. The lower end of the belt 45 is fixed to the gantry 21 on which the second shape portion 37F of the fuel tank 37 is held, and the upper end of the belt 45 is attached to the bracket 46 attached to the side surface of the hydraulic oil tank 16 and to the upper end of the belt 45. It is fixed through a nut 47 that is screwed into the provided screw portion. By rotating the nut 47, the pressing force of the belt 45 is applied to the fuel tank 37.

  Although the mini excavator 1 according to the first embodiment and the mini excavator according to the second embodiment described above have different shapes and dimensions of the swivel bodies 3 and 3A, the shape of the exterior cover 7 and the shape of the hydraulic oil tank 16 are common in advance. The shape is set to a substantially common shape. Further, the first divided portions 17A and 37A of the fuel tanks 17 and 37 to be resin-molded are arranged close to the hydraulic oil tank 16 and the outer cover 7, so that the inner cover 22 and the inner cover 22 which are easily affected by the surrounding parts arrangement, The second divided portions 17B and 37B are arranged close to the 22A side, and the first divided portions 17A and 37A of the fuel tanks 17 and 37 are formed by a common mold. That is, only the second divided portions 17B and 37B of the fuel tanks 17 and 37 are formed by dedicated molds corresponding to the respective shape dimensions of the revolving bodies 3 and 3A.

  Thereby, when both manufacture of the mini excavator 1 which concerns on 1st Embodiment, and manufacture of the mini excavator which concerns on 2nd Embodiment are considered, the total number of the shaping | molding die of a fuel tank can be decreased. Therefore, the cost required for the fuel tank mold, that is, the production cost of the fuel tank can be suppressed, the production cost of the mini excavator 1 according to the first embodiment, and the production cost of the mini excavator according to the second embodiment. Can be reduced.

  In addition, although the said 1st, 2nd embodiment is comprised with the mini excavator, this invention is not limited to a mini excavator. Any construction machine having a fuel tank disposed adjacent to the hydraulic oil tank on the revolving structure can be applied.

1 Mini excavator (construction machine)
DESCRIPTION OF SYMBOLS 2 Traveling body 3 Revolving body 3A Revolving body 4 Working apparatus 7 Exterior cover 8 Swing frame 9 Swing post 10 Swing cylinder 16 Hydraulic oil tank 17 Fuel tank 17A 1st division | segmentation part 17B 2nd division | segmentation part 17C Joint surface 17D Cylindrical part 17E 1st Shape part 17F 2nd shape part 21 Base 22 Inner cover 22A Inner cover 23 Partition plate 23A Partition plate 30 Arrangement space 31 Arrangement space 37 Fuel tank 37A First division part 37B Second division part 37C Joint surface 37D Tube part 37E First shape Part 37F Second shape part 40 Belt 45 Belt

Claims (5)

A swivel body, a working device attached to the swivel body, a hydraulic oil tank disposed on the swivel body, a fuel tank provided adjacent to the hydraulic oil tank, and the hydraulic oil provided on the swivel body In a construction machine comprising an inner cover that defines an arrangement space for the tank and the fuel tank, and an exterior cover that forms an outer peripheral wall of the swivel body,
The fuel tank is made of a resin in which the first divided portion and the second divided portion are joined to each other,
The first divided portion is disposed in the vicinity of the hydraulic oil tank and the exterior cover, and is invariant shape shared by each of a plurality of construction machines having different outer shapes of the revolving structure including the construction machine. Consisting of dimensions formed,
The construction machine characterized in that the second divided portion is disposed in the vicinity of the inner cover and is formed into a specific shape and dimension corresponding to the shape and dimension of the revolving structure of the construction machine. The construction machine according to claim 1,
The construction machine according to claim 1, wherein the joining surface of the first divided portion and the second divided portion of the fuel tank is a surface including a center line of a cylindrical portion forming a fuel filler port of the fuel tank. The construction machine according to claim 2,
A mini excavator provided with a swing cylinder for rotating the working device in the left-right direction,
A construction machine, wherein a space for arranging the swing cylinder is provided at a side of the hydraulic oil tank on the side of the inner cover and below the fuel tank. The construction machine according to claim 3,
The fuel tank has a first shape portion located on the exterior cover side, and a second shape that communicates with the first shape portion, is located on the inner cover side, and forms the placement space of the swing cylinder below. A construction machine characterized by comprising a part. The construction machine according to claim 4,
A construction machine comprising a belt that presses the second shape portion of the fuel tank so that the fuel tank comes into contact with the hydraulic oil tank.

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