JP5254091B2 - Construction machinery - Google Patents

Description

  The present invention relates to a construction machine such as a hydraulic excavator, and more particularly to a construction machine provided with an openable / closable cover that covers a tank.

  In general, a hydraulic excavator is known as a representative example of a construction machine. The hydraulic excavator includes a lower traveling body capable of self-propelling, an upper revolving body that is rotatably mounted on the lower traveling body, and the upper excavator. It is comprised by the working apparatus provided in the front side of the revolving body so that a heel-up-and-down movement was possible.

  The upper swing body includes a swing frame that forms a support structure, an engine that is mounted on the rear side of the swing frame and drives a hydraulic pump, and is positioned on the front side of the engine in the left and right directions of the swing frame. A building made of a cab or canopy provided on the left side and having a driver's seat on which an operator is seated, and a hydraulic oil tank located on the front side of the engine and provided on the right side of the revolving frame for storing hydraulic oil to be supplied to the hydraulic pump; A fuel tank that is provided on the revolving frame adjacent to the hydraulic oil tank and stores fuel to be supplied to the engine; and an exterior cover that covers mounted devices such as the engine, the hydraulic pump, the hydraulic oil tank, and the fuel tank. It is roughly structured.

  Here, the exterior cover includes a top cover that covers the upper side of the engine, an engine cover that covers the rear side of the engine, a side cover that covers the right side of each tank, a tank cover that covers the upper side of each tank, and the like.

  Then, by opening the tank cover of the exterior cover, the fuel filler port of the fuel tank can be exposed to the outside, and fuel can be supplied from the fuel filler port. Also, the lid provided on the upper surface of the hydraulic oil tank can be exposed to the outside, and the hydraulic oil can be inspected, refilled, and maintenance work such as a built-in filter can be performed by removing the lid. (For example, refer to Patent Document 1).

Japanese Patent Laid-Open No. 10-219741

  By the way, in Patent Document 1 described above, by opening one tank cover, it is possible to perform an oil supply operation to the fuel tank, a maintenance operation of the hydraulic oil tank, and the like. Therefore, the tank cover needs to be formed large so that both the fuel tank and the hydraulic oil tank can be exposed to the outside when opened.

  As a result, in a small work site, when the tank cover is opened to perform refueling work on the fuel tank, maintenance work on the hydraulic oil tank, etc., this large tank cover collides with surrounding obstacles etc. It may not be possible. For this reason, there exists a problem that workability | operativity, such as an oil supply operation | work and a maintenance operation | work, falls because a tank cover becomes obstructive.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to allow construction so that the upper side of the tank can be opened widely even in a narrow work site, and workability can be improved by a wide work space. To provide a machine.

A construction machine according to the present invention includes a self-propelled lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and a working device that is provided on the front side of the upper revolving body so as to be able to move up and down. The upper revolving structure comprises a revolving frame that forms a support structure, an engine that is mounted on the rear side of the revolving frame and drives a hydraulic pump, and a heat exchange that is provided on the right side in the left and right directions of the engine. vessels and, a building having a driver's seat provided operator is seated on the left side of the revolving frame positioned in front of the engine, the hydraulic pump is provided on the right side of the revolving frame positioned in front of the engine a hydraulic oil tank for storing hydraulic oil to be supplied to a fuel tank for storing fuel supplied to the engine is provided adjacent to the hydraulic oil tank on the rotating frame, the hydraulic oil tank and the heat exchanger A partition plate standing between the fuel tank and standing on the swing frame; an upper surface cover attached to the swing frame including the partition plate so as to cover an upper side of the engine; and the heat exchange A heat exchanger cover provided between the right part of the upper surface cover and the swivel frame so as to cover the right side of the heater, and a front end of the swivel frame so as to cover the lower part of the hydraulic oil tank and the fuel tank from the front side A front cover provided at a portion, a side cover provided between the front cover and the heat exchanger cover and covering the hydraulic oil tank and / or the fuel tank from the side, and the hydraulic oil tank and the fuel tank. And a tank cover covering the upper side.

In order to solve the above-mentioned problem, the feature of the configuration adopted by the invention of claim 1 is that the tank cover is arranged so as to cover the hydraulic oil tank and the front part of the fuel tank from above , and the front end is the A front cover portion that extends downward to be continuous with the front cover and is opened to the front with the front end as a fulcrum by a front hinge attached to the revolving frame, and covers the rear portion of the hydraulic oil tank and the fuel tank from above the rear upper side as a fulcrum by a side hinge after being mounted on the upper portion of the partition plate extends to the rear side as the rear end is disposed on the rear side of the front cover portion is continuous with the top cover as It is constituted by a rear cover portion that is opened.

According to a second aspect of the present invention, the rear end of the front cover part and the front end of the rear cover part overlap each other in the upward and downward directions when closed, A lock device is provided between the side cover and the side cover so as to hold the cover in a closed state.

According to a third aspect of the present invention, the locking device includes a catch provided on one side of the cover portion that overlaps the structure on the revolving frame side and the cover provided on the other side when the cover is closed. A hook that engages with the catch; and a release operation member that rotates the hook to release the engagement of the hook with the catch. The hook includes a first that is engageable with the catch. The present invention has a configuration in which a claw portion and a second claw portion that is located on the tip side of the first claw portion and can be engaged with the catch are provided.

According to the first aspect of the present invention, the tank cover covering the upper sides of the hydraulic oil tank and the fuel tank is disposed so as to cover the hydraulic oil tank and the front portion of the fuel tank from the upper side, and the front end is continuous with the front cover. A front cover that extends downward and can be opened and closed with the front end as a fulcrum by a front hinge attached to the swivel frame, and is arranged so as to cover the rear part of the hydraulic oil tank and the fuel tank from above, with the rear end serving as the top cover A rear cover that extends to the rear side in a continuous manner and that can be opened and closed with the rear end as a fulcrum by a rear hinge attached to the upper part of the partition plate is formed to be small in size. Can do.

  Therefore, even when refueling a fuel tank or operating a hydraulic oil tank at a small work site, the small cover can be easily and without colliding with surrounding obstacles. Can be fully opened.

  As a result, when performing a fuel supply operation to the fuel tank, a maintenance operation of the hydraulic oil tank, etc., a large work space can be provided to the worker, and these workability can be improved. Moreover, the opening / closing operation of the cover part can be performed only in a necessary part, and workability can be improved also in this respect.

According to the invention of claim 2, the lock device can hold the cover portion that overlaps on the upper side among the cover portions whose end portions overlap in the upward and downward directions in a closed state. As a result, the locking device can hold the cover portion overlapping on the upper side and the cover portion overlapping on the lower side in a closed state. As a result, the two cover portions can be held closed by one locking device, and the configuration can be simplified. In this case, a side cover that covers the hydraulic oil tank and / or the fuel tank from the side can be used, and a lock device can be provided between the side cover and the cover portion that overlaps the upper side.

According to the invention of claim 3 , when the cover portion overlapping on the upper side is closed, the hook can be engaged with the catch of the lock device provided between the structure on the revolving frame side, and the cover portion is closed. It can be fixed in the state. At this time, by locking the release operation member so that it cannot be operated, it is possible to prevent the opening of the two cover portions by one lock device, and to protect from theft, mischief, etc. of the fuel. On the other hand, by unlocking and operating the release operation member, the engagement of the hook with the catch can be released, and each cover portion can be opened.

  Furthermore, the hook of the locking device is provided with a first claw portion that can be engaged with the catch, and a second claw portion that is located on the tip side of the first claw portion and can be engaged with the catch. It has a two-stage configuration. Therefore, even when the first claw portion is detached from the catch during traveling or work, the second claw portion provided on the tip end side of the hook from the first claw portion engages with the catch. Thereby, the 2nd nail | claw part can control that a cover part opens.

  As a result, the lock device can reliably prevent the cover portion from being inadvertently opened during traveling or work by providing a simple configuration in which two hook portions are provided on one hook, improving reliability, etc. Can be achieved.

1 is a front view showing a hydraulic excavator according to an embodiment of the present invention. It is a top view of the hydraulic shovel shown in FIG. It is a top view shown in the state where the right side of a counterweight and an exterior cover was broken in order to expose an engine, a heat exchanger, a hydraulic oil tank, a fuel tank, and the like. It is a front view which shows a hydraulic excavator in the state which opened the front cover part of the tank cover. It is a front view which shows a hydraulic excavator in the state which opened the front cover part and rear cover part of the tank cover. It is a top view of the principal part expansion which shows the right front part of the upper revolving body in FIG. It is the principal part enlarged view which looked at the partition plate, the side cover, the tank cover, and the locking device from the left side. It is a perspective view which expands and shows a front cover part alone. It is a perspective view which expands and shows a back cover part alone. It is a principal part enlarged view shown by the closed position which engaged the hook and catch of the locking device. It is an expanded sectional view which looked at the hook assembly from the arrow XI-XI direction in FIG. It is the bottom view which looked at the hook assembly from the arrow XII-XII direction in FIG. FIG. 8 is an enlarged view of a main part of a tank cover, a locking device, and the like according to a modification of the present invention when viewed from the same position as in FIG.

  Hereinafter, a hydraulic excavator will be described as a representative example of the construction machine according to the embodiment of the present invention, and will be described in detail with reference to FIGS. In the embodiment, a cab type hydraulic excavator that surrounds a driver's seat and includes a cab will be described as a hydraulic excavator.

  In FIG. 1, reference numeral 1 denotes a hydraulic excavator as a construction machine. The hydraulic excavator 1 includes a self-propelled crawler-type lower traveling body 2, an upper revolving body 3 that is swingably mounted on the lower traveling body 2, and can be raised and lowered to the front side of the upper revolving body 3. It is generally configured by a working device 4 that is provided and performs soil excavation work and the like.

  The upper revolving structure 3 includes a revolving frame 5 that forms a support structure and has a work device 4 attached to the front. The left and right sides of the revolving frame 5 are shown in FIGS. The revolving structure 3 is curved in a convex arc shape so as to form a substantially circular shape. A cab 6 is mounted on the front side of the revolving frame 5 as a building that surrounds a driver's seat 6A that is positioned on the left side and on which an operator is seated. In addition, a counterweight 7 is attached to the rear portion of the swing frame 5 to balance the weight with the work device 4, and the counterweight 7 also projects rearward so that the upper swing body 3 has a substantially circular shape. It is formed so as to be curved.

  Furthermore, many devices are mounted on the turning frame 5. These mounted devices include an engine 8 that is positioned between the cab 6 and the counterweight 7 and mounted horizontally on the rear side of the revolving frame 5, and a hydraulic pump 9 that is mounted on the left side of the engine 8. And a heat exchanger 10 such as a radiator or an oil cooler provided on the right side of the engine 8, and a hydraulic oil tank located on the front side of the heat exchanger 10 and mounted on the right side of the swivel frame 5 (cab 6). 11, a fuel tank 12 provided on the revolving frame 5 adjacent to the right side of the hydraulic oil tank 11, a battery 13 disposed above the fuel tank 12, and the like. It is covered with an exterior cover 15 described later.

  Here, the hydraulic oil tank 11 is formed as a substantially rectangular parallelepiped sealed container that is long in the front and rear directions, and is configured to store the hydraulic oil supplied to the hydraulic pump 9 therein. Further, the upper surface portion 11A of the hydraulic oil tank 11 is provided with, for example, two lid bodies 11B and 11C located on the rear side. When the lid bodies 11B and 11C are removed, the hydraulic oil is inspected and refilled. In addition, replacement work, inspection of a built-in filter (not shown) for removing foreign matter in the hydraulic oil, replacement work, and other various maintenance work can be performed.

  On the other hand, the fuel tank 12 is formed as a sealed container extending in the front and rear directions along the hydraulic oil tank 11, and has a structure for storing fuel supplied to the engine 8 therein. Further, the fuel tank 12 protrudes upward at the front position, and an oil supply port 12A for replenishing fuel is provided at the upper end of the protruding portion. A cap 12B is attached to the fuel filler opening 12A. When the cap 12B is removed, fuel can be supplied from the fuel filler opening 12A.

  A partition plate 14 is provided between the engine 8 and the heat exchanger 10 and the hydraulic oil tank 11 and the fuel tank 12 and is erected on the revolving frame 5. The partition plate 14 is formed as a partition wall extending in the left and right directions so that heat on the engine 8 and heat exchanger 10 side does not flow to the hydraulic oil tank 11 and fuel tank 12 side. Further, as shown in FIG. 7, the partition plate 14 forms a structure on the revolving frame 5 side, and the rear cover portion 25 described later is rotatably supported at an upper position on the front surface thereof. A rear hinge 26 is attached.

  Reference numeral 15 denotes an exterior cover provided from the right side to the rear side of the cab 6, and the exterior cover 15 includes mounted devices such as the engine 8, the hydraulic pump 9, the heat exchanger 10, the hydraulic oil tank 11, and the fuel tank 12. It is something to cover. As shown in FIGS. 1 to 3, the exterior cover 15 includes a flat top cover 16 attached to a structure on the revolving frame 5 side such as a partition plate 14 so as to cover the upper side of the engine 8, and hydraulic pressure The pump cover 17 provided between the left part of the upper surface cover 16 and the revolving frame 5 so as to cover the left side of the pump 9 and the right part of the upper surface cover 16 so as to cover the right side of the heat exchanger 10. A heat exchanger cover 18 provided between the frame 5, an engine cover 19 provided on the counterweight 7 so as to cover the rear side of the engine 8, and lower portions of the hydraulic oil tank 11 and the fuel tank 12. A front cover 20 provided at the front end of the revolving frame 5 so as to cover from the front side, a side cover 21 provided between the front cover 20 and the heat exchanger cover 18, and a tank cover 22 described later. It is largely constituted by a locking device 27.

  Here, the side cover 21 covers the fuel tank 12 arranged on the outside in the left and right directions from the right side, and is formed as an arcuate curved face plate so as to follow the arc shape of the right side portion of the revolving frame 5. Has been. The side cover 21 is attached to the revolving frame 5 as one of the structures of the revolving frame 5. On the other hand, as shown in FIGS. 6 and 7, a mounting bracket 21 </ b> A projects from the inner surface of the side cover 21 toward the vicinity of the fuel filler opening 12 </ b> A of the fuel tank 12. A catch 28 of a lock device 27 described later is attached to the mounting bracket 21A.

  Next, the tank cover 22 that constitutes the right front portion of the exterior cover 15 and covers the upper sides of the hydraulic oil tank 11 and the fuel tank 12 will be described.

  That is, reference numeral 22 denotes a tank cover provided on the right side of the cab 6 (driver's seat 6A) and extending in the front and rear directions. The tank cover 22 covers the upper sides of the hydraulic oil tank 11 and the fuel tank 12 and is constituted by a front cover portion 23 and a rear cover portion 25 described later. In addition, the tank cover 22 is formed as a curved surface portion that is curved and extended downward from the upper surface cover 16 of the exterior cover 15 toward the front side, and the front portion is continuous with the front cover 20.

  Reference numeral 23 denotes a front cover portion that constitutes a front portion of the tank cover 22, and the front cover portion 23 covers the upper side of the front portions of the hydraulic oil tank 11 and the fuel tank 12. In the closed state as shown in FIG. 1, the front cover portion 23 is curved downward 23A toward the front so as to cover the tanks 11 and 12 from above, and the right edge of the curved surface plate 23A. The fan-shaped side plate 23 </ b> B extends from the side cover 21 toward the side cover 21 and covers the space between the side cover 21. Further, the front cover portion 23 extends downward (substantially in the vertical direction) so that the front end 23C is continuous with the front cover 20, and extends obliquely upward so that the rear end 23D is continuous with the front end 25C of the rear cover portion 25. ing.

  Here, the shape of the rear end 23D of the front cover portion 23 will be described. As shown in FIGS. 7 and 8, the rear end 23D has a rear end when the front cover portion 23 and the rear cover portion 25 are closed. An upper overlapping portion 23D1 that overlaps the upper side (outside) of the lower overlapping portion 25C1 formed at the front end 25C of the cover portion 25 is formed. The upper overlapping portion 23D1 is formed by projecting the outer surface side of the rear end 23D in a step shape. Thereby, when the front cover part 23 and the rear cover part 25 are closed, the upper overlapping part 23D1 of the rear end 23D of the front cover part 23 is overlapped on the upper side of the lower overlapping part 25C1 of the front end 25C of the rear cover part 25 without any step. be able to. Further, the gap between the front cover portion 23 and the rear cover portion 25 can be filled.

  Further, on the inner surface side of the curved face plate 23A, a hinge mounting portion 23E is formed on the front side (lower side). On the other hand, on the inner surface side of the side plate 23B, a hook mounting portion 23F is formed on the rear side for mounting a hook assembly 29 to be described later. A release operation member 32 is provided at the center of the hook mounting portion 23F. An insertion hole 23F1 for exposing to the outside is formed.

  As shown in FIGS. 6 and 7, the front cover portion 23 has one side of the front hinge 24 attached to the hinge attachment portion 23 </ b> E, and the other side of the front hinge 24 is located near the rear side of the front cover 20. Positioned and attached to the swivel frame 5. Thereby, the front cover part 23 can be opened to the front side with the front end 23C as a fulcrum, and in this open state, the fuel supply port 12A (cap 12B) of the fuel tank 12 can be exposed to the outside to perform the fuel supply operation. it can. Further, the front cover portion 23 can be closed by rotating to the rear side with the front end 23C as a fulcrum, and in this closed state, the closed state can be held by the lock device 27, and the door is locked to restrict the opening. You can also.

  Reference numeral 25 denotes a rear cover portion that constitutes a rear portion of the tank cover 22. The rear cover portion 25 is disposed on the rear side of the front cover portion 23, and is located above the rear portions of the hydraulic oil tank 11 and the fuel tank 12. It is something to cover. In the closed state, the rear cover portion 25 is curved toward the front so as to cover the tanks 11 and 12 from above, and the curved surface plate 25A is curved downward, and from the right edge of the curved surface plate 25A toward the side cover 21. The fan-shaped side plate 25 </ b> B extends and covers the side cover 21. Further, the rear cover portion 25 extends obliquely downward so that the front end 25C thereof is continuous with the front cover portion 23, and extends rearward (substantially in the horizontal direction) so that the rear end 25D is continuous with the upper surface cover 16. .

  Here, the shape of the front end 25C of the rear cover portion 25 will be described. As shown in FIGS. 7 and 9, the front end 25C has a front cover portion when the front cover portion 23 and the rear cover portion 25 are closed. A lower overlapping portion 25C1 that overlaps the lower side (inner side) of the upper overlapping portion 23D1 formed at the rear end 23D of 23 is formed. The lower overlapping portion 25C1 is formed by projecting the inner surface side of the front end 25C in a step shape. Accordingly, when the front cover portion 23 and the rear cover portion 25 are closed, the lower overlapping portion 25C1 of the front end 25C of the rear cover portion 25 is not stepped below the upper overlapping portion 23D1 of the rear end 23D of the front cover portion 23. Can be stacked. Further, the gap between the front cover portion 23 and the rear cover portion 25 can be filled. Further, on the inner surface side of the curved surface plate 25A, a hinge mounting portion 25E is formed on the rear side.

  As shown in FIG. 7, the rear cover portion 25 has a hinge mounting portion 25 </ b> E attached to one side of the rear hinge 26, and the other side of the rear hinge 26 is a partition erected on the revolving frame 5. It is attached to the upper part of the plate 14. Thereby, the rear cover part 25 can be opened rearward (upper side) with the rear end 25D as a fulcrum. In this open state, the lids 11B and 11C of the hydraulic oil tank 11, the battery 13 and the like are exposed to the outside. It can be exposed, and by removing the lids 11B and 11C, it is possible to check and replenish the hydraulic oil, perform maintenance work such as inspection, cleaning and replacement of the built-in filter, and check the battery 13, etc. Can do.

  Further, the rear cover portion 25 can be closed by rotating to the front side with the rear end 25D as a fulcrum. In this closed state, the rear end 23D of the front cover portion 23 overlaps the front end 25C of the rear cover portion 25, so that the rear cover portion 25 can be held in the closed state by the locking device 27 together with the front cover portion 23. The door can be restricted by locking.

  Thus, since the tank cover 22 is divided into two in the front and rear directions by the front cover part 23 and the rear cover part 25, the front cover part 23 and the rear cover part 25 can be formed smaller. Therefore, the small front cover part 23 and the rear cover part 25 can be easily fully opened with a light force without colliding with surrounding obstacles or the like even in a narrow work site.

  A lock device 27 is provided to hold the front cover portion 23 and the rear cover portion 25 in a closed state. The locking device 27 is provided between the front cover portion 23 that overlaps the upper side of the front cover portion 23 and the rear cover portion 25 and the side cover 21 that is a structure on the revolving frame 5 side. As shown in FIGS. 10 to 12, the lock device 27 includes a catch 28, a support member 30, a hook 31, a release operation member 32, and the like, which will be described later.

  Reference numeral 28 denotes a catch constituting the lock device 27, and the catch 28 is attached to the inner surface side of the side cover 21 on the revolving frame 5 side, for example. The catch 28 is formed by bending a rod-like body into a U shape, and is bolted to the mounting bracket 21A of the side cover 21 via the mounting plate 28A. Further, the catch 28 is formed to extend obliquely upward toward the rear side so that the hook 31 engages substantially orthogonally. Thereby, the hook 31 can be smoothly engaged with the catch 28, and rattling in the engaged state can also be suppressed.

  Reference numeral 29 denotes a hook assembly provided on the front cover portion 23 that overlaps the upper side of the rear cover portion 25. The hook assembly 29 includes a support member 30, a hook 31, and a release operation, which will be described later, as shown in FIGS. A single assembly is formed by assembling the members 32 and the like integrally. Thereby, since the hook assembly 29 can assemble | assemble a fine component to the support member 30 previously, assembly workability | operativity can be improved.

  Reference numeral 30 denotes a support member attached to a hook attachment portion 23F provided on the side plate 23B of the front cover portion 23. The support member 30 includes a hook support portion 30A that is bent in a U shape, and an attachment plate 30B that is attached to the bottom of the hook support portion 30A. The hook support portion 30A includes a support shaft 30C that rotatably supports the hook 31, and a positioning groove 30D that positions the catch 28 at substantially the same height as the support shaft 30C.

  Reference numeral 31 denotes a hook provided on the side plate 23B of the front cover part 23 via the support member 30. The hook 31 engages with the catch 28 on the side cover 21 side when the front cover part 23 is closed. The base end side of the hook 31 is rotatably attached to the support shaft 30C of the support member 30, and the tip end side extends obliquely downward toward the rear side so as to intersect the catch 28 at a substantially right angle. In addition, the hook 31 is provided with a first claw portion 31A located substantially in the middle in the length direction, and the second claw portion 31B is located on the tip side of the first claw portion 31A. Is provided. These claw portions 31 </ b> A and 31 </ b> B are formed as substantially triangular protrusions that can be engaged with the catch 28. The hook 31 has a pin 31C protruding from the proximal end side.

  Here, the first claw portion 31A is engaged with the catch 28 when the front cover portion 23 is pressed downward and closed to the door closing position shown in FIG. On the other hand, the second claw portion 31B engages with the catch 28 in a half-open position (half-door state) closed with a light force so as to place the front cover portion 23 on the side cover 21.

  Thus, since the hook 31 is provided with the first claw portion 31A and the second claw portion 31B in two stages, the first claw portion 31A is detached from the catch 28 at the time of running or working. Even in this case, the catch 28 can be engaged with the second claw portion 31B provided on the tip side of the hook 31 with respect to the first claw portion 31A. Thereby, it can restrict | limit that the front cover part 23 opens more largely than a half open position.

  A release operation member 32 is provided on the support member 30, and the release operation member 32 rotates the hook 31 to the opposite side to the engagement direction in order to release the engagement of the hook 31 with the catch 28. It is. As shown in FIG. 11, the release operation member 32 includes a pushing portion 32A inserted through the bottom of the support member 30, a case 32B surrounding the pushing portion 32A, and the pushing portion 32A. The push plate 32C is provided to extend in the diameter direction on the distal end side of the spring 32 and a spring member 32D that urges the pushing portion 32A to the side opposite to the pushing direction.

  Here, in the release operation member 32, the pushing portion 32A also serves as a key cylinder (lock), and an engine key is inserted into the pushing portion 32A and rotated in an arbitrary direction, as shown in FIG. In addition, the hook 31 can be released only when the pressing plate 32C is aligned with the pin 31C of the hook 31. On the other hand, by releasing the position of the push plate 32C from the pin 31C of the hook 31 by operating an engine key (not shown), it is possible to achieve a locked state in which the opening of the front cover portion 23 is restricted.

  Reference numeral 33 denotes a return spring provided around the support shaft 30 </ b> C of the support member 30. When the catch 28 comes into contact with the hook 31 when the front cover portion 23 is closed, the return spring 33 allows the hook 31 to rotate toward the release position due to the inclination of the claw portions 31A and 31B. Has a spring force that can be returned to the engaged position when it passes through the claw portions 31A and 31B.

  The hydraulic excavator 1 according to the present embodiment has the above-described configuration. Next, the operation of the hydraulic excavator 1 will be described.

  In this case, the operator can move the lower traveling body 2 forward or backward by getting on the cab 6 of the upper swing body 3 and operating an operation lever (not shown) for traveling. On the other hand, by operating a working operation lever (not shown), the working device 4 can be moved up and down to perform excavation work of earth and sand.

  Next, an operation (operation) for opening and closing the tank cover 22 in order to perform maintenance work and the like will be described.

  First, when opening the front cover portion 23 at the door closing position shown in FIG. 1, the fingertip is pushed into the insertion hole 23F1 of the front cover portion 23 to push the push portion 32A of the release operation member 32 of the lock device 27. Then, the hook 31 is rotated toward the release position. Thereby, the engagement between the catch 28 and the first claw portion 31A is released, and the front cover portion 23 is kept pressed until the half-open position is passed so that the second claw portion 31B is not engaged. As shown in FIG. 4, the front cover portion 23 can be opened to the front side with the front end 23C as a fulcrum.

  At this time, since the front cover portion 23 is formed small, even in a narrow work site, the front cover portion 23 can be easily fully opened without colliding with surrounding obstacles and the like with a light force. A wide working space can be formed around the fuel filler opening 12 </ b> A of the fuel tank 12 by opening the front cover portion 23 to the fully open state. Thereby, the operator can perform the oil supply work easily.

  Further, when the rear cover portion 25 is opened rearward (upper side) with the rear end 25D as a fulcrum, as shown in FIGS. 5 and 6, the lid bodies 11B and 11C of the hydraulic oil tank 11, the battery 13 and the like are externally connected. Therefore, by removing the lids 11B and 11C, maintenance work such as inspection and replenishment of the deterioration of the hydraulic oil, inspection of the built-in filter, cleaning and replacement can be performed. Also, the inspection work of the battery 13 can be performed. As described above, when the rear cover portion 25 is opened, the rear cover portion 25 can be opened largely with a light force in substantially the same manner as the front cover portion 23, and the various operations described above can be easily performed.

  Further, when the above-described operation is completed, the rear cover portion 25 having the lower overlapping portion 25C1 at the front end 25C is closed first, and the front cover portion 23 having the upper overlapping portion 23D1 at the rear end 23D is closed later. Accordingly, the opening of the rear cover portion 25 can be restricted by the front cover portion 23, and the front cover portion 23 can be kept closed by the lock device 27. At this time, the door can be restricted by locking the lock device 27 using the engine key.

  Thus, according to the present embodiment, the tank cover 22 that covers the hydraulic oil tank 11 and the upper side of the fuel tank 12 is located on the front side and opened to the front side with the front end 23C as a fulcrum, and the front cover The rear cover portion 25 is located on the rear side of the portion 23 and is opened to the rear side with the rear end 25D as a fulcrum.

  Therefore, the front cover part 23 and the rear cover part 25 can be made smaller by dividing the tank cover 22 into two parts. Thereby, even when refueling work to the fuel tank 12 and maintenance work of the hydraulic oil tank 11 are performed in a narrow work site, the small cover portions 23 and 25 do not collide with surrounding obstacles and the like, and light force can be obtained. Can be fully opened.

  As a result, when performing the refueling work to the fuel tank 12, the maintenance work of the hydraulic oil tank 11, etc., a large work space can be provided to the worker, and these workability can be improved. In addition, only the front cover portion 23 can be opened at a portion requiring opening / closing operation of the cover portions 23 and 25, for example, at the time of refueling work. In this respect, workability can be improved.

  Further, since the locking device 27 is provided between the front cover portion 23 that overlaps the front end 25C of the rear cover portion 25 from above when closed, and the side cover 21 on the revolving frame 5 side, The part 23 can be held in a closed state. Thereby, the rear cover part 25 can be held in the closed state together with the front cover part 23, and the configuration can be simplified. In addition, by locking the release operation member 32 of the locking device 27 with the engine key, the opening of the two cover portions 23 and 25 is blocked by the single locking device 27 and protected from fuel theft, mischief and the like. be able to.

  On the other hand, by using the side cover 21 that covers the fuel tank 12 from the side as a structure on the revolving frame 5 side, a lock device 27 can be provided between the side cover 21 and the front cover portion 23.

  Furthermore, the hook 31 of the locking device 27 includes a first claw portion 31A that can be engaged with the catch 28, and a second claw portion 31A that is located on the tip side of the first claw portion 31A and can be engaged with the catch 28. Can be engaged in two stages with the claw portion 31B. Therefore, even if the engagement of the first claw portion 31A with the catch 28 is insufficient and the first claw portion 31A may be detached from the catch 28 at the time of running or working, the first claw portion 31A is more than the first claw portion 31A. The second claw portion 31 </ b> B provided on the tip end side of the hook 31 can be engaged with the catch 28. As a result, the simple configuration of providing the two hooks 31A and 31B on one hook 31 can surely prevent the cover portion from being inadvertently opened during traveling or work, and can improve reliability, etc. Can be achieved.

  In the embodiment, the case where the upper overlapping portion 23D1 of the rear end 23D of the front cover portion 23 is overlapped with the lower overlapping portion 25C1 of the front end 25C of the rear cover portion 25 from the upper side is described as an example.

  However, the present invention is not limited to this. For example, the present invention may be configured as a modification shown in FIG. That is, 41 is a tank cover according to a modified example, and the upper overlapping portion 42C1 of the front end 42C of the rear cover portion 42 may be superposed on the lower overlapping portion 43D1 of the rear end 43D of the front cover portion 43 from above.

  In the modification of FIG. 13, the rear cover portion 42 is a cover portion that overlaps on the upper side. Therefore, by providing a locking device 44 between the rear cover portion 42 and the side cover 21, one lock is provided. The device 44 can hold the two cover portions 42 and 43 in a closed state. In this case, the locking device 44 may be configured to attach the catch 45 to the rear cover portion 42 and attach the hook assembly 46 to the side cover 21.

  In the embodiment, the fuel tank 12 is provided adjacent to the right side of the hydraulic oil tank 11. However, the present invention is not limited to this. For example, a hydraulic oil tank may be provided adjacent to the right side of the fuel tank. Further, the hydraulic oil tank and the fuel tank may be arranged adjacent to each other in the front and rear directions. Furthermore, it is good also as a structure which arrange | positions a hydraulic-oil tank and a fuel tank adjacent in the up and down direction.

  Moreover, in embodiment, the case where the catch 28 of the locking device 27 was provided in the side cover 21 which comprises the structure by the side of the turning frame 5 was mentioned as an example, and was demonstrated. However, the present invention is not limited to this. For example, the catch 28 includes the revolving frame 5, structures such as columns and beams constituting a part of the revolving frame 5, components of the engine 8, the tanks 11 and 12, and the like. It is good also as a structure provided in another structure.

  Further, in the embodiment, the cab type hydraulic excavator 1 is described as an example of the construction machine. However, the present invention is not limited to this, and may be applied to a canopy-type hydraulic excavator that covers the driver's seat from above with a canopy as a building. On the other hand, the present invention may be applied to a hydraulic excavator having a wheel type lower traveling body instead of the crawler hydraulic excavator.

1 Excavator (construction machine)
2 Lower traveling body 3 Upper revolving body 4 Working device 5 Revolving frame 6 Cab (building)
6A Driver's seat 8 Engine 9 Hydraulic pump 11 Hydraulic oil tank 12 Fuel tank 15 Exterior cover 21 Side cover (structure on the swivel frame side)
22, 41 Tank cover 23 Front cover portion 23A, 25A, 42A, 43A Curved surface plate 23B, 25B, 42B, 43B Side plate 23C, 25C, 42C, 43C Front end 23D, 25D, 42D, 43D Rear end 23D1, 42C1 Upper overlapping portion 24 Front hinge 25, 42 Rear cover part 25C1, 43D1 Lower overlap part 26 Rear hinge 27, 44 Locking device 28, 45 Catch 29, 46 Hook assembly 30 Support member 31 Hook 31A First claw part 31B Second claw Part 32 Release operation member

Claims (3)

A self-propelled lower traveling body, an upper revolving body mounted on the lower traveling body so as to be able to swivel, and a working device provided on the front side of the upper revolving body so as to be able to move up and down,
The upper swing body includes a swing frame that forms a support structure, an engine that is mounted on the rear side of the swing frame and drives a hydraulic pump, and a heat exchanger that is provided on the right side in the left and right directions of the engine, a building having a driver's seat provided operator is seated on the left side of the revolving frame positioned in front of the engine is supplied to the hydraulic pump disposed on the right side of the revolving frame positioned in front of the engine A hydraulic oil tank for storing hydraulic oil, a fuel tank provided on the revolving frame adjacent to the hydraulic oil tank for storing fuel to be supplied to the engine, and between the heat exchanger, the hydraulic oil tank, and the fuel tank A partition plate erected on the revolving frame and an upper surface cover attached to the revolving frame side including the partition plate so as to cover the upper side of the engine; The heat exchanger cover provided between the right part of the top cover and the swivel frame so as to cover the right side of the heat exchanger, and the swivel so as to cover the lower part of the hydraulic oil tank and the fuel tank from the front side. A front cover provided at a front end of the frame, a side cover provided between the front cover and the heat exchanger cover and covering the hydraulic oil tank and / or the fuel tank from the side; and the hydraulic oil tank; In a construction machine comprising a tank cover that covers the upper side of the fuel tank,
The tank cover is arranged so as to cover the hydraulic oil tank and the front part of the fuel tank from the upper side , and extends downward so that the front end is continuous with the front cover. A front cover part that is opened to the front as a fulcrum, and a rear part that is arranged on the rear side of the front cover part so as to cover the rear part of the hydraulic oil tank and the fuel tank from above , so that the rear end is continuous with the upper cover. construction machine characterized by being configured by the cover portion after that is opened to the upper side of the rear end as the fulcrum by a side hinge after being mounted on the upper portion of the partition plate extends to the side. The rear end of the front cover part and the front end of the rear cover part are configured to overlap upward and downward when closed,
The construction machine according to claim 1, wherein a lock device for holding the cover portion in a closed state is provided between the cover portion overlapping the upper side of the cover portions and the side cover . The locking device includes a catch provided on one side of the cover portion that overlaps the structure on the revolving frame side, and a hook provided on the other side that engages with the catch when the cover is closed. And a release operation member for rotating the hook to release the engagement of the hook with the catch,
The hook is provided with a first claw portion that can be engaged with the catch, and a second claw portion that is located on the tip side of the first claw portion and can be engaged with the catch. The construction machine according to claim 2 .

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