JP2006089989A - Construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely loosen a bolt by means of a tool by decreasing the degree of damage to a head of the bolt, when an under cover for closing an opening formed on a pedestal of construction machine is mounted on the pedestal by means of the bolt and a nut. <P>SOLUTION: An upward elongated pedestal-side mounting part 48 is provided at the peripheral edge of the opening 28 of the pedestal. A downward elongated cover-side mounting part 51 is provided at the peripheral edge of the under cover 40. The mounting part 51 is arranged in such a manner as to face a side surface of the mounting part 48. Through-holes 49 and 52 are formed in the mounting part 48 and the mounting part 51, respectively. The bolt 41 is inserted into the through-holes 49 and 52 from the inside of the opening 28, so as to be screwed into the nut 42. The head 41a of the bolt 41 is positioned above an undersurface of the pedestal 10. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a construction machine such as a hydraulic excavator or a hydraulic crane, for example, and particularly belongs to the technical field of a structure having a traveling body at a lower part.

  Conventionally, this type of construction machine includes a crawler-type lower traveling body and an upper revolving body provided on the upper side of the lower traveling body so as to be able to swivel. A base connected to the traveling body is provided, and an operator's cabin, a power source engine, and the like are disposed on the upper surface of the base (for example, see Patent Document 1). In this construction machine, there are cases where maintenance is performed from below when servicing equipment and engines in the cabin, so the base is provided with a service opening that opens to the bottom surface. Can be easily performed.

By the way, when the construction machine travels on the construction site, the lower traveling body may involve an obstacle such as a rock rolling on the construction site, and the involved obstacle may hit the lower surface of the base. In order to prevent damage to each device of the base due to this, in Patent Document 1, an under cover for closing the opening is detachably attached to the base using fastening means. Specifically, a through hole is formed vertically through the periphery of the opening of the base, and a weld nut is fixed to the upper side of the through hole. On the other hand, a through hole is formed at the periphery of the under cover so as to correspond to the through hole of the base. Then, after the under cover is overlapped with the periphery of the opening of the base from below, a bolt is inserted into the through hole of the under cover from below and screwed into the nut of the base, so that the under cover is Attached to. Thereby, the opening part of the base is closed and the obstacles caught in the lower traveling body are prevented from hitting each device on the base.
Japanese Patent Laid-Open No. 2002-302065 (5th page, 6th page, FIG. 2)

  However, in Patent Document 1, since the bolt is screwed into the nut of the base from below the under cover, the head of the bolt, that is, the tool engaging portion with which a tool such as a wrench engages in the fastened state. The whole protrudes from the lower surface of the under cover toward the lower traveling body. In this case, the obstacle caught in the lower traveling body tends to hit the entire tool engaging portion of the bolt, and the tool engaging portion may be damaged throughout. If the entire tool engaging portion is damaged in this way, the tool cannot be engaged with the tool engaging portion, and the bolt cannot be loosened.

  The present invention has been made in view of such points, and an object of the present invention is to devise a fastening structure for both when an under cover is detachably attached to a base using fastening means. By reducing the degree of damage of the engaging portion, the fastening state by the fastening means can be reliably released using a tool.

  In order to achieve the above object, according to the present invention, a base-side mounting portion that protrudes upward is provided at the peripheral edge of the opening in the base, and a cover-side mounting portion that protrudes downward is provided on the under cover. In the state where the parts are opposed to the side of the base-side mounting part, the fastening means are fastened in the facing direction, and the tool engaging part of the fastening means is positioned above the lower surface of the base. I tried to position it.

  Specifically, in the first aspect of the present invention, a base is provided on the upper side of the lower traveling body, an opening that opens downward is formed on the base, and an under cover is provided on the base with the opening. It is intended for a construction machine that is detachably attached using fastening means so as to be closed.

  A base-side mounting portion that protrudes upward is provided on the periphery of the opening of the base, and a cover-side mounting that protrudes downward on the periphery of the under cover and faces the side of the base-side mounting portion. And the fastening means fastens the two mounting portions in a direction facing each other with the cover side mounting portion disposed opposite to the side of the base side mounting portion, and inward of the opening. A tool engaging portion is provided, and the tool engaging portion is positioned above the lower surface of the base.

  According to this configuration, when the under cover is attached to the base, the tool engaging portion of the fastening means is located above the lower surface of the base, so that the lower traveling body is moved when the construction machine travels. Many of the obstacles that have been caught hit the lower surface of the base before hitting the tool engaging portion. Thereby, the frequency with which an obstacle hits the tool engaging portion is reduced, and the degree of damage to the tool engaging portion is reduced.

  Furthermore, the fastening means fastens the base side mounting portion protruding upward and the cover side mounting portion facing the side of the mounting portion in the direction in which they face each other. The lower half of the section faces the lower traveling body, but the upper half does not face the lower traveling body. For this reason, the obstacle caught by the lower traveling body does not hit the upper half of the tool engaging portion, and the upper half of the tool engaging portion is prevented from being damaged. The degree of damage at the joint is reduced.

  When removing the under cover, the degree of damage to the tool engaging portion is small as described above, so that the tool can be engaged with the tool engaging portion, and the cover side attaching portion by the fastening means can be used. It becomes possible to cancel | release fastening with the base side attaching part.

  According to a second aspect of the present invention, in the first aspect of the present invention, the under cover includes a main body portion that closes the opening of the base, and a cover-side attachment portion is provided at a peripheral edge portion of the main body portion. Is provided with a handle for gripping when the under cover is attached or detached.

  According to this configuration, when the undercover is attached or detached, the operator can safely and easily perform the operation by holding the handle. And since the cover side attachment part which protrudes downward from the main body part of the under cover is attached to the base side attachment part of the base, the main body part of the under cover is the base when the under cover is attached to the base. It is located above the lower surface of. Since the handle is provided on the lower surface of the main body, it is avoided that the handle protrudes downward from the lower surface of the base. Thereby, when a construction machine drive | works, the frequency that the obstacle which the lower traveling body got caught hits a handle becomes low.

  According to a third aspect of the present invention, in the first or second aspect of the invention, the under cover is brought into contact with the base from above in a state where the fastening of the cover side mounting portion and the base side mounting portion is released. Is provided with a support portion that supports the base.

  According to this configuration, when the fastening between the cover side mounting portion and the base side mounting portion is released, the under cover is supported by the base by the support portion of the under cover, so the under cover is the opening of the base Is prevented from falling unexpectedly.

  According to a fourth aspect of the present invention, in any one of the first to third aspects of the present invention, the base side mounting portion extends along the peripheral edge of the opening in the base, and the cover side mounting portion is the base side mounting portion. It is set as the structure extended along the side surface.

  According to this configuration, since the cover-side mounting portion extends along the side surface of the base-side mounting portion, for example, noise generated in each device disposed on the upper surface of the base is separated from the base-side mounting portion. It is possible to suppress leaking downward from between the cover side mounting portion.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects of the present invention, the fastening means includes a bolt that penetrates the cover side mounting portion and the base side mounting portion from the inside of the opening, and a screw threaded on the bolt. A holding portion for holding the bolt in a state where the bolt is loosened with respect to the screwing portion and the fastening of the cover side mounting portion and the base side mounting portion is released. It is set as the structure provided.

  According to this configuration, by loosening the bolt, the fastening between the cover-side mounting portion and the base-side mounting portion is released, and the undercover can be removed from the base. At this time, the bolt holds the base. Held in the department.

  According to the first aspect of the present invention, the base side mounting portion protruding upward using the fastening means and the cover side mounting portion provided on the under cover are fastened in the opposite direction, and the tool engaging portion of the fastening means Is positioned above the lower surface of the base, so that the frequency with which the obstacle caught by the lower traveling body hits the tool engaging portion can be reduced, and damage to the upper half of the tool engaging portion can be prevented. As a result, the degree of damage to the tool engaging portion is reduced, and when removing the under cover from the base, the tool can be engaged with the tool engaging portion, and the cover side mounting portion and the base side by the fastening means The fastening with the mounting portion can be reliably released.

  According to the invention of claim 2, the under cover can be attached and detached safely and reliably. And in the state which attached the under cover to the base, since a handle does not protrude largely from the lower surface of a base, it can suppress that a handle is damaged by an obstruction.

  According to the invention of claim 3, since the under cover can be supported on the base in a state where the fastening of the cover side mounting portion and the base side mounting portion is released, the under cover is removed when the under cover is removed. It is possible to prevent the camera from dropping unexpectedly, thereby further improving the safety of work.

  According to the invention of claim 4, since the cover side mounting portion of the under cover extends along the side surface of the base side mounting portion in the base, for example, it occurs in each device arranged on the upper surface of the base Noise can be prevented from leaking below the base, and the noise of the construction machine can be reduced.

  According to the fifth aspect of the present invention, the bolt can be held by the holding portion of the base in a state in which the fastening of the cover side mounting portion and the base side mounting portion is released. Can be prevented from being lost.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 2 shows a construction machine 1 according to an embodiment of the present invention. The construction machine 1 is a so-called hydraulic excavator, and performs excavation of earth and sand, crushed stone, and demolition of a building at a construction site where civil engineering work or construction work is performed. The construction machine 1 includes a lower traveling body 3 provided with a crawler 2 in which a large number of plate-like members are connected endlessly, and an upper revolving body 5 attached to the upper side of the lower traveling body 3 via a turning device 4. And.

  A base 10 is provided below the upper swing body 5, and a working mechanism 11 is provided on the upper surface of the base 10 on the front side in the traveling direction. This working mechanism 11 is connected to a boom 12 attached to the base 10 so as to be tiltable in the vertical direction, an arm 13 attached to the tip of the boom 12 to be swingable, and a tip of the arm 13. It consists of a bucket 14. An operator cabin 15 is disposed on the upper surface of the base 10 adjacent to the work mechanism 11 mounting portion, and an operation for operating the work mechanism 11 is not shown in the cabin 15. Equipment and air conditioning equipment are provided. Although not shown, an engine and a hydraulic pump are disposed behind the working mechanism 11 on the upper surface of the base 10, and these are covered with a cover 16. Further, a counterweight 17 is mounted on the upper surface of the base 10 behind the cover 16.

  As shown in FIG. 3, a pair of center frames 20 extending in the advancing direction are disposed at a distance in the left-right direction of the base 10 at a substantially central portion in the left-right direction that is the width direction of the base 10. On the rear side of the center frame 20 in the traveling direction, a pair of center members 21 extending in the left-right direction of the base 10 are arranged at intervals in the traveling direction so as to connect the center frames 20. A portion surrounded by the center member 21 and the center frame 20 forms a substantially rectangular center opening 22 that opens below the base 10. The center opening 22 is used for maintenance of the engine and the hydraulic pump from below.

  A left side deck 23 and a right side deck 24 are respectively disposed on both sides of the base frame 10 in the left-right direction of the center frame 20. On the front side of the left side deck 23 in the traveling direction, three left side members 25 extending in the left-right direction are disposed at intervals in the traveling direction. At the left end of the left side deck 23, a side member 26 extending in the traveling direction is disposed so as to connect the left end of the left member 25. The portion surrounded by the center frame 20, the three left side members 25 and the side member 26 forms a substantially rectangular first left side opening portion 27 and second left side opening portion 28 that open below the base 10. is doing. The first left side opening 27 and the second left side opening 28 are provided to allow maintenance of each device disposed in the cabin 15 from below.

  In addition, a pair of right members 30 extending in the left-right direction of the base 10 are disposed on the rear side in the traveling direction of the right side deck 24 with a gap in the traveling direction. At the right end of the right side deck 24, a side member 31 extending in the traveling direction is disposed so as to connect the right end of the right member 30. The portion surrounded by the center frame 20, the two right members 30 and the side members 31 has a substantially rectangular shape so that the engine and the hydraulic pump can be serviced from below like the center opening 22. A right opening 32 is formed.

  The center opening 22, the first left opening 27, the second left opening 28, and the right opening 32 are respectively closed by an under cover 40. Each under cover 40 is detachably attached to the base 10 using fastening means 43 including bolts 41 and nuts 42. The head 41a of the bolt 41 constitutes the tool engaging portion of the present invention, and has a hexagonal shape with which a tool (not shown) such as a wrench is engaged. Further, the nut 42 constitutes a screwing portion of the present invention.

  Since the center opening 22, the first left opening 27, the second left opening 28 and the right opening 32 are different in size, the under cover 40 also has the sizes of the openings 22, 27, 28 and 32. Although the sizes are different from each other, the structure of each under cover 40 and the mounting structure of the under cover 40 to the base 10 are common. Therefore, the structure of the under cover 40 attached to the second left-side opening 28 and the structure of attaching the under cover 40 to the base 10 will be described in detail below. In addition, the code | symbol 19 of FIG.3 and FIG.4 is a board | plate material.

  As shown in FIGS. 4 and 5, the two left and right left members 25 constituting the second left opening 28 are configured by combining an upper panel 45 and a lower panel 46 each formed of a steel plate. . The upper panel 45 is formed in a channel shape so as to have a U-shaped cross section that opens downward, and the lower panel 46 is formed in a flat plate shape extending substantially horizontally so as to close the lower open portion of the upper panel 45. The lower panel 46 is formed with an extending portion 47 that extends inward of the second left-side opening 28 from the upper panel 45. A lower end portion of the upper panel 45 is joined to the upper surface of the lower panel 46 by welding, for example, so that the panels 45 and 46 are integrated. Therefore, the lower surface of the lower panel 46 is the lower surface of the base 10.

  A peripheral edge portion of the second left opening 28 in the extending portion 47 of each lower panel 46 is bent so as to protrude upward to constitute a base side attachment portion 48 to which the under cover 40 is attached. Each base-side mounting portion 48 extends substantially vertically and in the left-right direction of the base 10 which is the width direction of the second left-side opening 28. Three circular through holes 49 are formed in the base-side attachment portion 48 at intervals in the width direction of the second left-side opening 28. The center lines of these through holes 49 extend in a direction along the lower surface of the base 10, that is, in a direction substantially parallel to the ground, which is the traveling surface of the construction machine 1.

  On the other hand, the under cover 40 is formed by forming a steel plate that is thinner than the steel plates constituting the panels 45 and 46 of the left member 25. The under cover 40 includes a rectangular main body 50 that is formed in substantially the same shape as the second left opening 28 and closes the second left opening 28, and is attached to the base side of the main body 50. A peripheral edge portion corresponding to the portion 48 is bent so as to protrude downward to constitute a cover side attachment portion 51. As shown in FIG. 1, the cover side mounting portion 51 extends substantially vertically and so as to face the side surface outside the opening 28 of the base side mounting portion 48. The cover side mounting portion 51 is formed so as to be in close contact with the side surface outside the opening 28 of the base side mounting portion 48.

  Three circular through holes 52 are formed in the cover side mounting portion 51 so as to correspond to the through holes 49 of the base side mounting portion 48. The nut 42 is attached to the peripheral edge of the through hole 52 opposite to the base side attaching part 48 by, for example, welding. The center line of the nut 42 extends in substantially the same direction as the center line of the through hole 49 of the base side mounting portion 48. For this reason, the bolt 41 is screwed into the nut 42 from the direction in which both the mounting portions 48 and 51 are opposed in a state where the cover side mounting portion 51 is disposed so as to face the side of the base side mounting portion 48. It is like that. Thereby, the base side attaching part 48 and the cover side attaching part 51 are fastened in the direction in which both face each other.

  When the bolt 41 is screwed into the nut 42, the head 41 a of the bolt 41 faces the inside of the second left opening 28. Further, the vertical positions of the through holes 49 and 52 and the nut 42 are such that the head 41 a of the bolt 41 is positioned above the lower surface of the base 10 when the bolt 41 is screwed into the nut 42. It is set to be.

  Further, a boundary portion between the main body portion 50 and the cover-side attachment portion 51 in the under cover 40 constitutes a support portion 53 of the under cover 40. The support portion 53 is in contact with the upper end portion of the base side mounting portion 48 from above with the bolt 41 and the nut 42 loosened to release the fastening of the base side mounting portion 48 and the cover side mounting portion 51. The cover 40 is supported on the base 10.

  Further, as shown in FIG. 6, on the lower surface of the main body portion 50, two handles 55 that are gripped by an operator when the under cover 40 is attached and detached are provided at an interval in the width direction of the second left-side opening 28. It has been. Each handle 55 is formed so as to have a U-shaped cross section that opens upward, and its open side edge is joined to the main body 50 by, for example, welding. As shown in FIG. 1, each handle 55 is formed so as not to protrude downward from the lower surface of the base 10 with the under cover 40 attached to the base 10. In other words, the lower end of the handle 55 is located above the lower surface of the base 10.

  Next, a procedure for attaching the under cover 40 to the base 10 will be described. First, the handle 55 of the under cover 40 is grasped and the under cover 40 is tilted and inserted from below the second left side opening 28 to above the base 10. Thereafter, the entire under cover 40 is lowered so that the main body portion 50 of the under cover 40 is substantially horizontal, and both support portions 53 of the under cover 40 are brought into contact with the upper end portion of the base side mounting portion 48. Accordingly, the under cover 40 is supported by the base 10 and does not fall from the second left side opening 28 even if the hand is released from the handle 55.

  Next, after the through hole 52 of the cover side mounting portion 51 is substantially aligned with the through hole 49 of the base side mounting portion 48, the bolt 41 is inserted into the through holes 49, 52 from the inside of the second left opening 28. Inserted outward and screwed into the nut 42. Thereby, the cover side attaching part 51 and the base side attaching part 48 are fastened, and the under cover 40 is attached to the base 10.

  In a state where the under cover 40 is attached to the base 10, the head 41 a of the bolt 41 is located above the lower surface of the base 10 and does not protrude downward from the lower surface of the base 10. For this reason, most of the obstacles such as rocks that the crawler 2 has involved when the construction machine 1 travels hit the lower surface of the base 10 before hitting the head 41 a of the bolt 41. Thereby, the frequency with which an obstacle hits the head 41a of the bolt 41 is reduced, and the degree of damage to the head 41a is reduced.

  Further, since the cover side mounting portion 51 is opposed to the side of the base side mounting portion 48 protruding upward, and both the mounting portions 48 and 51 are fastened in the direction in which they face each other by the bolt 41 and the nut 42. The upper half of the head 41 a of the bolt 41 in the fastened state faces the opposite side with respect to the lower traveling body 3. For this reason, when the obstacle in which the crawler 2 of the lower traveling body 3 is caught hits the head 41a of the bolt 41 from below, it does not hit the upper half of the head 41a, but the upper part of the head 41a. Half damage can be prevented in advance.

  Further, since the head 41a of the bolt 41 is located as described above, a large rock or a demolished part of the building is formed on the lower surface of the base 10 due to the turning operation of the upper revolving structure 5 or the traveling of the lower traveling structure 3. Even when it hits, the frequency with which the rocks or the like hit the head 41a of the bolt 41 is reduced, and it is possible to prevent the rock 41 or the like from hitting the upper half of the head 41a.

  Therefore, according to this embodiment, the base-side mounting portion 48 and the cover-side mounting portion 51 are fastened in the direction in which they face each other using the bolt 41 and the nut 42, and the head 41a of the bolt 41 is fixed. Since it is positioned above the lower surface of the base 10, the degree of damage to the head 41 a of the bolt 41 can be reduced. As a result, the hexagonal shape of the head portion 41a of the bolt 40 can be left, and when removing the under cover 40, the tool can be engaged with the head portion 41a and the bolt 41 is operated in the direction of loosening. Thus, the fastening of the base side mounting portion 48 and the cover side mounting portion 51 can be reliably released.

  Further, since the under cover 40 is provided with the handle 55, when the under cover 40 is attached or detached, the operator can safely and easily perform the operation by holding the handle 55. And since the handle 55 is located above the lower surface of the base 10, the frequency with which the obstacle in which the lower traveling body 3 is caught hits the handle 55 is reduced, and a large rock or the like is caused by a turning operation or traveling. The frequency of hitting is also reduced, so that damage to the handle 55 can be suppressed.

  Further, since the cover side mounting portion 51 of the under cover 40 is in close contact with the side surface of the base side mounting portion 48, for example, noise generated in the engine is generated between the cover side mounting portion 51 and the base side mounting portion 48. Leakage to the outside can be reduced and the noise of the construction machine 1 can be reduced.

  Further, when the under cover 40 is removed, the under cover 40 is supported on the base 10 by the support portion 53 of the under cover 40 in a state where the fastening of the base side attaching portion 48 and the cover side attaching portion 51 is released. be able to. Thereby, when removing the undercover 40, it can prevent falling unexpectedly, and the safety | security of work can be improved further.

  In this embodiment, the base-side mounting portion 48 is formed by bending the lower panel 46 of the left member 25. However, as in the first modification shown in FIG. After being formed as a separate body, it may be integrated with the lower panel 46. The base-side mounting portion 48 of the first modification is configured by a substantially cubic block as shown in FIG. 2B, and is fixed to the upper surface of the extended portion 47 of the lower panel 46 and is located above the lower panel 46. And has a through hole 49 corresponding to the through hole 52 of the cover side mounting portion 51. These base side attaching portions 48 are provided at intervals from each other in accordance with the arrangement of the fastening means 43.

  The length of the bolt 41 of the first modification is set longer corresponding to the length of the through hole 49 of the base side mounting portion 48. The length of the through hole 49 is set to such an extent that the bolt 41 does not fall out of the through hole 49 with the bolt 41 removed from the nut 42. That is, the through hole 49 of the first modification constitutes a holding portion of the present invention.

  According to the first modification, the bolt 41 can be held on the base 10 in a state in which the fastening of the base side mounting portion 48 and the cover side mounting portion 51 is released. Thereby, for example, when the under cover 40 is attached and detached at a construction site where rocks or the like are rolling, loss due to the drop of the bolt 41 can be prevented in advance. Further, the handle of the under cover 40 can be omitted as in the first modification.

  Further, when the bolt 41 is held on the base 10 as in the first modification, the second modification shown in FIG. 8 may be used. That is, the base side mounting portion 48 is formed by bending the extension portion 47 of the lower panel 46 of the left member 25 upward, and the bolt 41 is formed on the inner side surface of the second left side opening 28 of the base side mounting portion 48. A cylindrical member 60 through which is inserted is fixed. The center line of the cylindrical member 60 coincides with the center line of the through hole 49 of the base side mounting portion 48. The length of the cylindrical member 60 in the center line direction is set such that the bolt 41 does not fall out of the cylindrical member 60 with the bolt 41 removed from the nut 42. The holding part of the invention is configured.

  In the above embodiment, the nut 42 constitutes the threaded portion of the present invention. However, the nut 42 is omitted, and a female thread portion is formed on the inner surface of the through hole 52 of the cover side mounting portion 51. You may comprise a screwing part with an internal thread part.

  Moreover, in the said embodiment, although the cover side attaching part 51 is arrange | positioned on the outer side of the 2nd left side opening part 28 of the base side attaching part 48, like the modification 3 shown in FIG. The side attachment portion 51 may be disposed on the inner side of the second left side opening 28 of the base side attachment portion 48 to fasten both attachment portions 48 and 51. The cover-side mounting portion 51 is formed with a groove 61 that opens downward. The width of the groove 61 is set larger than the outer diameter of the shaft portion 41 b of the bolt 41, and the shaft portion 41 b of the bolt 41 enters the groove 61.

  In the third modification, when the under cover 40 is attached to the base 10, the bolt 41 is inserted into the through hole 49 of the base side attachment portion 48 and only the tip end portion of the shaft portion 41 b is screwed into the nut 42. Thus, the bolt 41 can be held by the base side mounting portion 48. That is, the base side attaching part 48 constitutes a holding part of the present invention.

  Then, the under cover 40 is lowered from above the bolt 41 to allow the shaft portion 41 b of the bolt 41 to enter the groove 61. When the bolt 41 is completely screwed into the nut 42 in a state where the bolt 41 has completely entered the groove 61, the base side mounting portion 48 and the cover side mounting portion 51 are fastened. In the third modification, as shown in FIG. 9B, a plurality of bent portions 61 a are formed in the middle of the groove 61, and the lower portion and the upper portion of the groove 61 are separated in the longitudinal direction of the cover-side mounting portion 51. However, the shape of the groove 61 may be linear. Further, also in the third modification, the nut 42 may be omitted and a female screw portion may be formed on the inner surface of the through hole 49 of the base side mounting portion 48, and the female screw portion may be used as the screwing portion of the present invention.

  In this embodiment, the construction machine 1 is a hydraulic excavator. However, the present invention can be applied to the construction machine 1 including the base 10 on which the engine and the like are disposed on the upper side of the lower traveling body 3. For example, it can be applied to a hydraulic crane. Further, the base 10 provided on the upper side of the lower traveling body 3 may be fixed without being able to turn.

  Moreover, although the lower traveling body 3 of this embodiment is a crawler type, the present invention can also be applied to a type in which the lower traveling body has wheels such as rubber.

  In this embodiment, the nut 42 is disposed outside the opening 28 of the cover side mounting portion 51, and the bolt 41 is screwed into the nut 42 from the inside of the opening 28. Bolts are arranged so as to protrude from the base side mounting portion 48 or the cover side mounting portion 51 toward the inside of the opening 28, and both nuts 42 are screwed into the stud bolts from the inside of the opening 28. The attachment portions 48 and 51 may be fastened. In this case, since the nut 41 faces the inside of the opening 28, the tool engaging portion of the present invention is constituted by a hexagonal portion on the outer periphery of the nut 42.

  Further, a rubber seal material, for example, may be interposed between the base side mounting portion 48 and the cover side mounting portion 51. Thereby, it is possible to further reduce leakage of noise generated by the engine disposed on the base 10 from the opening 28 to the outside.

  Furthermore, the shape of the outer periphery of the head 41a of the bolt 41 and the nut 42 may be a shape other than the hexagonal shape, and the fastening means 43 may be a screw other than the bolt 41 and the nut 42. Good.

  As described above, the construction machine according to the present invention is suitable for use at a construction site where civil engineering work or construction work is performed, for example.

It is the sectional view on the AA line in FIG. 1 is a side view of a construction machine according to an embodiment of the present invention. It is a top view of a base. It is a perspective view of the state which showed the 2nd left-side opening vicinity in a base, and located the under cover above the 2nd left-side opening. It is a figure which expands and shows the base side attaching part and cover side attaching part of FIG. It is the perspective view which looked at the undercover from the lower part. In connection with the first modification of the embodiment, (a) is a view corresponding to FIG. 1, and (b) is an enlarged perspective view showing a base side mounting portion. FIG. 10 is a view corresponding to FIG. 1 in a state in which the under cover is positioned above the second left-side opening according to the second modification of the embodiment. FIG. 9A is a diagram corresponding to FIG. 1 and FIG. 9B is an enlarged view as viewed in the direction of arrow Y in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Construction machine 3 Lower traveling body 10 Base 28 2nd left side opening part 40 Undercover 41 Bolt 41a Bolt head (tool engaging part)
42 Nut (threaded part)
43 Fastening means 48 Base side mounting part 49 Through hole (holding part)
50 Body 51 Cover-side mounting portion 53 Support portion 55 Handle 60 Cylindrical member (holding portion)

Claims (5)

A base is provided on the upper side of the lower traveling body, and an opening that opens downward is formed in the base. The under cover can be attached to and detached from the base using fastening means so as to close the opening. An installed construction machine,
On the periphery of the opening of the base is provided a base side mounting portion protruding upward,
A cover side mounting portion that protrudes downward and faces the side of the base side mounting portion is provided at the periphery of the under cover,
The fastening means fastens the two attachment portions in a direction facing each other in a state where the cover side attachment portion is disposed opposite to the side of the base side attachment portion, and a tool engagement portion facing the inside of the opening portion. With
The construction machine characterized in that the tool engaging portion is positioned above the lower surface of the base. The construction machine according to claim 1,
The under cover includes a main body portion that closes the opening of the base, and a cover-side attachment portion is provided on a peripheral portion of the main body portion.
A construction machine characterized in that a handle is provided on the lower surface of the main body for gripping when the under cover is attached or detached. The construction machine according to claim 1 or 2,
The under cover is provided with a support portion that contacts the base from above and supports the under cover on the base in a state where the fastening of the cover side mounting portion and the base side mounting portion is released. A featured construction machine. In the construction machine as described in any one of Claims 1-3,
The base side mounting portion extends along the peripheral edge of the opening in the base,
A construction machine, wherein the cover side mounting portion extends along a side surface of the base side mounting portion. In the construction machine as described in any one of Claims 1-4,
The fastening means includes a bolt that penetrates the cover side mounting portion and the base side mounting portion from the inside of the opening, and a screwing portion that is screwed to the bolt.
The base is provided with a holding portion for holding the bolt in a state where the bolt is loosened with respect to the screwed portion and the fastening between the cover side mounting portion and the base side mounting portion is released. Construction machinery to do.

Images