JP4515847B2 - Construction machinery - Google Patents

Description

  The present invention relates to a construction machine such as a hydraulic excavator, for example, and more particularly to a construction machine that can easily carry out a demounting operation of a counterweight.

  Generally, a construction machine such as a hydraulic excavator is provided with a work device on the front side of the frame constituting the vehicle body, and a counterweight is detachable on the rear side of the frame to balance the weight with the work device. (See, for example, Patent Document 1).

Japanese Patent Laid-Open No. 10-237903

  In this type of conventional hydraulic excavator, a building cover is erected on the frame at the front side of the counterweight, and the building cover is a machine room for accommodating machinery such as an engine inside. Is defined. In addition, a substantially rectangular opening is formed in the upper part of the building cover so that the engine and the like can be inspected and maintained from above.

  An engine cover is attached to the upper surface of the building cover so as to be openable and closable using a hinge such as a hinge so as to cover the opening from above. When the engine cover is closed, the left and right sides of the engine cover and the front side are in contact with the upper surface of the building cover, and the rear side is in contact with the upper surface of the counterweight. It is set as the structure which prevents intrusion in a building cover via (for example, refer patent document 2).

JP-A-11-78988

  In the prior art described above, for example, two hinges are provided on the left and right sides of the engine cover so as to be separated from each other in the front and rear directions, and the engine cover is opened using these hinges as fulcrums. Since it is configured to be closed, one side of the engine cover continues to contact the upper surface of the building cover not only when the door is closed, but also when the door is opened, and the rear portion thereof continues to contact the upper surface of the counterweight.

  For this reason, in the prior art, when the counterweight is attached / detached on the rear end side of the frame, it is necessary to remove the engine cover from the upper surface of the building cover in advance. There is a problem of spending a lot of labor and time.

  Further, after the counterweight is attached and detached, it is necessary to reattach the engine cover to the upper surface of the building cover via a hinge, which also increases the burden on the operator.

  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 easy removal and removal of the counterweight without removing the engine cover, improving workability, It is to provide a construction machine that can greatly reduce the burden on the user.

In order to solve the above-described problems, the present invention provides a vehicle body frame in which a working device is provided on the front side and a counterweight is provided on the rear side, and an engine mounted on the frame so as to be close to the counterweight, A building cover standing on the frame to define a machine room for accommodating the engine therein and having an opening for inspecting the engine at an upper portion, and to cover the opening of the building cover an engine cover portion provided to be opened and closed is disposed above the counterweight on the該建Ya cover, the engine cover is left, one side of the right direction with a hinge on the upper surface of the housing cover is pivotably connected, the left is applied to construction machines other side of the right direction is so constructed that opens and closes as a fulcrum the hinge side is a free end.

A feature of the configuration adopted by the invention of claim 1 is that the engine cover is provided so that a lower surface of the engine cover comes into contact with an upper surface of the building cover and an upper surface of the counterweight when closed. A raising bracket is provided between the hinge attached to the side and the upper surface of the building cover, the raising bracket being attached in a state where the hinge is raised by a predetermined dimension from the upper surface of the building cover, and the hinge is attached to the building by the raising bracket. When the engine cover is attached to the engine cover at a position above the lower surface of the engine cover and raised by the predetermined dimension from the upper surface of the cover, and the engine cover is opened with the hinge as a fulcrum, the engine cover configured as the lower surface of the side portion is spaced from the upper surface of the counterweight after It lies in the fact was.

According to a second aspect of the present invention, the raised bracket is formed by raising the fixed plate portion fixed to the upper surface of the building cover and raising the upper portion relative to the fixed plate portion, and the hinge is raised upward. It is constituted by a raised plate section attached preparative conditions.

According to a third aspect of the present invention, there is provided a vehicle body frame in which a working device is provided on the front side and a counterweight is provided on the rear side, an engine mounted on the frame so as to be close to the counterweight, A building cover provided with an opening for inspecting the engine, and a building cover that covers the opening of the building cover. An engine cover that is provided on the counterweight and that is partly disposed on the upper side of the counterweight. The engine cover is located on the upper lid plate and on the left and right sides of the lid plate. A left side plate part and a right side plate part; and a front plate part and a rear plate part located on both sides of the front and rear direction of the lid plate part, wherein one side of the left side plate part or the right side plate part is the building cover. Hinge on top In the construction machine configured to be pivotably connected and open and close with the other side of the left side plate part or the right side plate part as a free end and the hinge side as a fulcrum, the engine cover is The lower surface of the plate portion, the right side plate portion and the front plate portion is in contact with the upper surface of the building cover, and the lower surface of the rear plate portion is provided in contact with the upper surface of the counterweight. hinge forming a chamfered portion inclined at an angle in a boundary portion between the one side of the left side plate portion or the right side plate attached to the rear plate side, the chamfer, and the hinge as a fulcrum when you open the engine cover Te, that it has a configuration in which a gap is formed between the upper surface of the front SL counterweight spaced above the upper surface of the counterweight and the engine cover It is a symptom.

As described above, according to the first aspect of the present invention, the upper surface of the building cover is provided with a raised bracket to which a hinge is attached to the engine cover, and when the engine cover is opened with the hinge as a fulcrum, Since the lower surface of the rear portion of the engine cover is configured to be separated from the upper surface of the counterweight, an upper and lower gap can be formed between the upper surface of the counterweight and the engine cover in this state. When the counterweight is attached / detached, the counterweight can be easily attached / detached by lifting the counterweight upward from the rear side of the frame using this gap. For this reason, the work of detaching the counterweight from the rear side of the frame can be performed with the engine cover open, and it is necessary to remove the engine cover in advance during the work of detaching the counterweight as in the prior art. Disappear.

Therefore, when the engine cover is closed, the lower surface of the engine cover comes into contact with the upper surface of the building cover and the upper surface of the counterweight, and when the engine cover is opened with the hinge as a fulcrum, the lower surface of the rear portion of the engine cover is It is spaced apart from the upper surface of the counterweight. For this reason, only by setting the engine cover open from the top surface of the building cover with the hinge as a fulcrum, the work for removing and mounting the counterweight can be performed using the gap formed between the top surface of the counterweight and the engine cover. This can be easily performed, and the workability can be improved, and the burden on the operator can be greatly reduced.

In particular, said between said hinge attached to one side of the engine cover and the upper surface of the housing cover, so as to provide a mounting Keru raising bracket in a state where the hinge has been raised by a predetermined distance from the top surface of the housing cover Therefore, it can be attached to the upper surface of the building cover with the hinge raised upward, and when the engine cover is opened, a gap corresponding to the raised height of the raised bracket is provided between the upper surface of the counterweight and the engine. It can be formed between the cover. The counterweight can be easily attached and detached using the gap at this time.
Further, in the invention according to claim 2, the fixed plate portion of the raised bracket can be fixed to the upper surface of the building cover, and the raised plate portion formed by raising the fixed plate portion to the upper side includes: The hinge can be attached in a state where it is raised upward.

According to the invention described in claim 3, the engine cover is provided with a chamfered portion inclined obliquely at a boundary portion between the left side plate portion to which the hinge is attached or the one side of the right side plate portion and the rear plate portion side. since a configuration of forming the said when opening the engine cover can be chamfered portion to form a gap between said counterweight and an engine cover spaced from the upper surface of the counterweight, at this time The counterweight can be easily attached and detached using the gap.

  Hereinafter, a construction machine according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings, taking as an example a case where the construction machine is applied to a hydraulic excavator.

  Here, FIG. 1 to FIG. 9 show a first embodiment of the present invention. In the figure, reference numeral 1 denotes a hydraulic excavator as a construction machine. The hydraulic excavator 1 is mounted on a crawler type lower traveling body 2 capable of self-propelling as shown in FIG. The upper revolving unit 3 and a work device 4 provided so as to be able to move up and down in front of the upper revolving unit 3 for excavation work such as earth and sand are roughly constituted.

  In this case, the upper swing body 3 of the hydraulic excavator 1 constitutes the vehicle body of the construction machine together with the lower traveling body 2. The upper swing body 3 includes a swing frame 5, a cab 6, a counterweight 7, a building cover 8, an engine 9, an engine cover 12, and the like which will be described later.

  Reference numeral 5 denotes a revolving frame constituting a support structure (frame) for the upper revolving structure 3. The revolving frame 5 is attached to the front side thereof so that the working device 4 can move up and down, and a counterweight 7 described later is provided on the rear side. Installed.

  Reference numeral 6 denotes a cab as an operation driving unit disposed on the left side of the front part of the revolving frame 5, in which a driver's seat on which an operator sits, an operation lever, an operation pedal (none of which are shown), and the like. It is arranged.

  Reference numeral 7 denotes a counterweight provided on the rear end side of the revolving frame 5. The counterweight 7 is detachably mounted on the rear end side of the revolving frame 5, and the entire upper revolving unit 3 is attached to the front working device 4. The weight balance is taken. A building cover 8 that houses an engine 9 and the like to be described later is provided on the front side of the counterweight 7. And the upper surface 7A of the counterweight 7 is arrange | positioned on the surface (height position) substantially the same as the below-mentioned upper cover 8B, as shown in FIG.

  Further, on the upper surface 7A of the counterweight 7, screw seats 7B, 7B and the like are formed as shown in FIG. For example, when the work for attaching / detaching the counterweight 7 is performed, the below-described suspension bolts 20 and the like are screwed to these screw seats 7B as shown in FIG.

  Reference numeral 8 denotes a building cover which is positioned between the cab 6 and the counterweight 7 and is erected on the revolving frame 5. The building cover 8 includes a plurality of sheets made of steel plates or the like as shown in FIGS. 1 to 6. It is formed using a metal panel and defines a machine room inside. The building cover 8 includes side covers 8A and 8A provided upright on both the left and right sides of the revolving frame 5, and an upper cover 8B provided on the upper side of each side cover 8A.

  Here, the upper cover 8B of the building cover 8 is provided with an opening 8C as an inspection window used when inspecting an engine 9 and the like described later from above as shown in FIGS. 8C is formed as a substantially square-shaped square hole that is located on the front side of the counterweight 7 and extends long in the left and right directions. And this opening part 8C is covered by the engine cover 12 mentioned later so that opening and closing is possible from the upper side.

  Reference numeral 9 denotes an engine as a prime mover located near the counterweight 7 and provided on the rear side of the swivel frame 5. The engine 9 is installed in the building cover 8 (see FIG. 2, FIG. 4, FIG. 5). The machine room is housed horizontally and extends in the building cover 8 leftward and rightward. A heat exchanger 10 including a radiator, an oil cooler, and the like, and a cooling fan 11 are disposed on one side of the engine 9, and a plurality of hydraulic pumps (not shown) are disposed on the other side of the engine 9. ) Etc. can be attached.

  An engine cover 12 opens and closes the opening 8C of the building cover 8. The engine cover 12 includes an upper lid plate portion 12A having a substantially rectangular shape as shown in FIGS. 2 to 8, and the lid plate portion 12A. The left and right side plate portions 12B and 12C, which are located on both the left and right sides of the cover plate 12B, and the lid plate portion 12A are located on both sides of the front and rear sides of the cover plate portion 12A. The front plate portion 12D and the rear plate portion 12E are formed as a relatively flat (shallow) cover body.

  The engine cover 12 has a left rear corner portion 12F inclined obliquely outward at the boundary between the left plate portion 12B and the rear plate portion 12E, and between the right plate portion 12C and the rear plate portion 12E. Is a corner portion 12G on the right rear side inclined obliquely outward. Further, the boundary between the left side plate portion 12B and the front plate portion 12D becomes the left front corner portion 12H inclined obliquely outward, and the boundary portion between the right side plate portion 12C and the front plate portion 12D is diagonally outside. The corner portion 12J on the right front side is inclined in the direction.

  Here, the engine cover 12 is pivotally connected to the upper surface of the building cover 8 (upper cover 8B) using a hinge 15 or the like described later on the left side plate portion 12B, so that the engine cover 12 The right side plate portion 12C becomes a free end and is disposed above the counterweight 7 as shown in FIG.

  The right side plate portion 12C of the engine cover 12 is provided with a lock mechanism (not shown) or the like between the upper cover 8B and the lock mechanism closes the opening 8C of the building cover 8 with the engine cover 12. When the engine cover 12 is closed, the engine cover 12 is held in a closed state and is locked as necessary.

  When the engine cover 12 is closed as shown in FIGS. 2 and 3, the left side plate portion 12B, the right side plate portion 12C, the front plate portion 12D and the like are brought into contact with the upper surface of the upper cover 8B via a seal member 17 which will be described later. The rear plate portion 12E comes into contact with the upper surface 7A of the counterweight 7 via a seal member 17 or the like. Thereby, the engine cover 12 in the closed state prevents foreign matters such as rainwater and dust from entering the building cover 8 from the opening 8C of the upper cover 8B.

  Reference numerals 13 and 13 denote a pair of notches provided in the left side plate portion 12B of the engine cover 12, and the notches 13 are substantially spaced apart in the front and rear directions of the left side plate portion 12B as shown in FIG. It is formed by cutting into a U shape. And in each notch 13, the below-mentioned hinge 15 and the raising bracket 16 are arrange | positioned in the position used as the lower side of the attachment board 14, as shown in FIG.

  Reference numeral 14 denotes an attachment plate for attaching the hinge 15 to the left side plate portion 12B of the engine cover 12. The attachment plate 14 is formed as shown in FIG. It is located above the notch 13 and fixed to the left side plate portion 12B of the engine cover 12 by means such as welding. The mounting plate 14 forms a triangular space portion 14A between the left side plate portion 12B and a hinge 15 is attached to the lower side surface of the mounting plate 14 through a notch 13.

  Reference numerals 15 and 15 denote hinges for connecting the engine cover 12 to the upper cover 8B of the building cover 8 so as to be openable and closable. These hinges 15 are constituted by, for example, hinges or the like, and each notch 13 of the engine cover 12 as shown in FIG. It arrange | positions with the raising bracket 16 mentioned later inside. The hinge 15 is pivotably mounted between the mounting plate 14 and the raised bracket 16, and the hinge 15 opens and closes the engine cover 12 as shown in FIGS. 5 and 6. (Rotation center) is configured.

  Reference numerals 16 and 16 are raised brackets for mounting the hinges 15 in the notches 13 of the engine cover 12 in a raised state. The raised brackets 16 are formed by pressing a rigid metal plate or the like, for example, as shown in FIG. The lower fixed plate portion 16A is formed in a flat plate shape, and is formed by bending the fixed plate portion 16A into a crank shape or a substantially L shape, with respect to the fixed plate portion 16A. It is comprised by the upper raising board part 16B raised by the dimension H. FIG.

The raised bracket 16 has a lower fixing plate portion 16A fixed to the upper surface of the upper cover 8B using bolts or welding means, and the upper raised plate portion 16B is fixed to the lower surface side of the hinge 15 with bolts or welding means. It is fixed using etc. Thereby, the raising bracket 16 is attached to the engine cover 12 (attachment plate 14) with the hinge 15 raised by the dimension H from the upper surface of the upper cover 8B. That is, the hinge 15 is attached to the engine cover 12 at a position above the lower surface of the engine cover 12.

  Therefore, when the engine cover 12 is opened as shown in FIGS. 5 to 8, a gap corresponding to the raised height (dimension H) of the raised bracket 16 is formed between the upper surface 7 </ b> A of the counterweight 7 and the rear portion of the engine cover 12 ( It is formed between the rear portion of the left side plate portion 12B and the rear plate portion 12E).

  Reference numeral 17 denotes a seal member provided on the lower surface side of the engine cover 12, and the seal member 17 includes the entire lower surface of the engine cover 12 (left side plate portion 12B, right side plate portion 12C, front plate, as shown in FIGS. 4 and 5). Are attached to the lower surface of the portion 12D and the rear plate portion 12E, and seals between the upper cover 8B located around the opening 8C, the upper surface 7A of the counterweight 7 and the engine cover 12.

  2, a hydraulic oil tank 18 is located on the right side of the building cover 8 and provided on the revolving frame 5 as shown in FIG. 2. The hydraulic oil tank 18 is connected to the suction side of the hydraulic pump and is hydraulically operated. Return oil from an actuator (not shown) is recirculated. Further, a fuel tank 19 for supplying fuel to the engine 9 is provided on the front side of the hydraulic oil tank 18.

  The hydraulic excavator 1 according to the present embodiment has the above-described configuration, and the operation thereof will be described next.

  First, when an operator who has entered the cab 6 of the excavator 1 operates a start switch to start the engine 9 in the building cover 8, the engine 9 drives a hydraulic pump and the like. Then, when the operator appropriately tilts the operation lever or the like in the cab 6, the pressure oil from the hydraulic pump causes the hydraulic cylinders of the working device 4, the hydraulic motor for turning, or the hydraulic pressure for traveling of the lower traveling body 2. It is fed and discharged by a motor (both not shown) and performs excavation work such as earth and sand.

  When maintenance and inspection of the engine 9 and the heat exchanger 10 provided in the building cover 8 are performed, the opening 8C provided in the upper cover 8B is opened by opening the engine cover 12 upward as shown in FIGS. Open to the outside as shown. In this state, the opening 8C is used as an inspection window, and maintenance (maintenance and inspection) can be easily performed on the engine 9 and the heat exchanger 10 in the building cover 8.

  Incidentally, a counterweight 7 is detachably provided on the rear side of the revolving frame 5 in order to balance the weight of the upper revolving body 3 with respect to the front working device 4. The counterweight 7 is detachable from the rear part of the swing frame 5 as necessary when the excavator 1 is transported or when the work content is changed.

  However, if the rear portion of the engine cover 12 comes into contact with or interferes with the upper surface 7A of the counterweight 7 at the time of attaching / detaching the counterweight 7, the attaching / detaching operation of the counterweight 7 cannot be performed smoothly. But as I mentioned, it takes extra effort and time.

  Accordingly, in the present embodiment, the raised brackets 16 and 16 are provided on the upper surface of the upper cover 8B, which is located around the opening 8C of the building cover 8, and the hinges 15 and 15 that support the engine cover 12 so as to be openable and closable are provided. It is set as the structure attached between the raising board part 16B of the raising bracket 16 and the attachment board 14 of the engine cover 12. FIG.

  Thereby, each hinge 15 that supports the engine cover 12 so as to be rotatable (openable and closable) can be held in a state of being raised by the dimension H from the upper surface of the upper cover 8B using the raised brackets 16 and 16. For this reason, when the engine cover 12 is opened as shown in FIGS. 5 to 8 and the like, a gap corresponding to the raised height (dimension H) of the raised bracket 16 is formed between the upper surface 7A of the counterweight 7 and the rear side of the engine cover 12. It can be formed between the parts (the rear part of the left plate part 12B, the rear plate part 12E).

  As a result, when the counterweight 7 is detached, the counterweight 7 is lifted slightly from the rear side of the swivel frame 5 using this gap (dimension H shown in FIGS. The counterweight 7 can be easily attached and detached by pulling it out in the direction).

  That is, when performing the work of attaching / detaching the counterweight 7, for example, the suspension bolts 20 and the like are screwed to the screw seats 7B shown in FIGS. 2 and 6 as shown in FIG. 9, and are connected to the suspension bolts 20 in this state. The wire 21 is lifted using a crane (not shown) or the like. At this time, the counterweight 7 is lifted upward from the rear side of the swivel frame 5 within a gap of dimension H as shown by a solid line in FIG. 9, and thereafter, as shown by a two-dot chain line in FIG. The counterweight 7 is detached and attached by being lifted obliquely backward.

  Thus, in the present embodiment, the engine cover 12 is formed between the upper surface 7A of the counterweight 7 and the rear portion of the engine cover 12 simply by opening the engine cover 12 upward from the upper surface of the building cover 8. The counterweight 7 can be easily attached and detached using the gap (dimension H).

  Therefore, according to the present embodiment, the work of detaching the counterweight 7 from the rear side of the turning frame 5 can be performed with the engine cover 12 open, and the work of detaching the counterweight can be performed as in the prior art. Occasionally, laborious work such as removing the engine cover can be eliminated. Thereby, the workability | operativity at the time of attachment / detachment of a counterweight can be improved, and a worker's burden can be reduced significantly.

  Next, FIGS. 10 to 18 show a second embodiment of the present invention. The feature of this embodiment is that when a corner portion located on the left side of the rear portion of the engine cover is chamfered and the engine cover is opened. The chamfered portion is separated from the upper surface of the counterweight. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In the figure, reference numeral 31 denotes an engine cover that opens and closes the opening 8C of the building cover 8. The engine cover 31 is configured in substantially the same manner as the engine cover 12 described in the first embodiment. 12 includes an upper lid plate portion 31A, a left side plate portion 31B, a right side plate portion 31C, a front plate portion 31D, and a rear plate portion 31E.

  The engine cover 31 includes a left rear corner portion 31F, a right rear corner portion 31G, a left front corner portion 31H, a right front corner portion 31J, and the like. However, the engine cover 31 in this case is different in that a chamfered portion 32 (to be described later) is provided at a corner portion 31F on the left rear side that is a boundary portion between the left plate portion 31B and the rear plate portion 31E. is there.

  When the engine cover 31 is closed as shown in FIGS. 10 to 13, the left side plate portion 31B (the front portion of the chamfered portion 32 described later), the right side plate portion 31C, the front plate portion 31D and the like are on the upper surface of the upper cover 8B. The rear plate portion 31E (the rear portion of a chamfered portion 32 described later) abuts on the upper surface 7A of the counterweight 7 via the seal member 17 or the like. Thereby, the engine cover 31 in the closed state prevents foreign matters such as rainwater and dust from entering the building cover 8 from the opening 8C of the upper cover 8B.

  The right side plate portion 31C of the engine cover 31 is provided with a lock mechanism (not shown) or the like between the upper cover 8B and the lock mechanism closes the opening 8C of the building cover 8 with the engine cover 31. When the engine cover 31 is closed, the engine cover 31 is held in a closed state and locked as necessary.

32 is a chamfered portion provided on corner portion 31F of the engine cover 31, chamfer 32, the boundary between the left side plate part 31 B and the rear plate portion 31E of the engine cover 31 as shown in FIGS. 10 to 12 The portion (left rear corner portion 31F) is formed so as to be chamfered obliquely at an angle of, for example, 30 to 60 degrees, preferably about 45 degrees. The chamfer 32 is for connecting the corner portion 31F between the left side plate part 31 B and the rear plate portion 31E obliquely with a certain angle of inclination.

  Here, the chamfered portion 32 is spaced upward from the upper surface 7A of the counterweight 7 when the engine cover 31 is opened as shown in FIG. For example, a gap of dimension H1 or more shown in FIG. 15 is formed between the part 32 (engine cover 31).

  Reference numerals 33 and 33 denote a pair of notches provided in the left side plate portion 31B of the engine cover 31, and the notches 33 are substantially spaced apart in the front and rear directions of the left side plate portion 31B as shown in FIG. It is formed by cutting into a U shape. However, in the notch 33 in this case, only a hinge 35 described later is disposed at a position below the mounting plate 34 as shown in FIGS.

  Reference numeral 34 denotes an attachment plate for attaching the hinge 35 to the left side plate portion 31B of the engine cover 31. The attachment plate 34 is formed as shown in FIG. 13, for example, by bending a thin metal plate into a substantially square shape. The upper cover 33 is fixed to the left side plate 31B of the engine cover 31 by means such as welding. The mounting plate 34 forms a triangular space portion 34A between the left side plate portion 31B and a hinge 35 is attached to the lower side surface of the mounting plate 34 through a notch 33.

  Reference numerals 35 and 35 denote hinges for connecting the engine cover 31 to the upper cover 8B of the building cover 8 so as to be openable and closable. These hinges 35 are configured in the same manner as the hinge 15 described in the first embodiment. As shown, each engine cover 31 is disposed in each notch 33. The hinges 35 and 35 are rotatably mounted between the upper surface of the upper cover 8B and the mounting plate 34, and the hinges 35 open and close the engine cover 31 as shown in FIGS. The fulcrum (rotation center) when doing is comprised.

  Thus, also in the present embodiment configured as described above, when the engine cover 31 is opened, the dimension H1 shown in FIG. 15 between the upper surface 7A of the counterweight 7 and the chamfered portion 32 of the engine cover 31, for example. The above gaps can be formed, and substantially the same operational effects as in the first embodiment can be obtained.

That is, the chamfer in the present embodiment, which as chamfering the boundary portion between the left side plate part 31 B and the rear plate portion 31E of the engine cover 31 (corner portion 31F of the left rear side), inclined obliquely Since the portion 32 is provided, when the engine cover 31 is opened, the engine cover 31 can be reliably separated from the upper surface 7A of the counterweight 7 by the chamfered portion 32, and the dimensions shown in FIG. A gap of H1 or more (for example, a gap larger than that of the first embodiment) can be formed.

  For this reason, in the present embodiment, the removal work of the counterweight 7 can be performed as shown in FIG. 18 without specially removing the engine cover 31 from the upper surface of the building cover 8. Such desorption work can be performed more easily than the first embodiment by using a large gap of dimension H1 or more shown in FIG. 15, and the workability at the time of demounting the counterweight is improved. In addition, the burden on the operator can be greatly reduced.

Incidentally, in the second embodiment, the corner portion 31F between the left side plate part 31 B and the rear plate portion 31E of the engine cover 31, the case where the chamfered portion 32 of the inclined wall surface or the like as an example explained. However, the present invention is not limited to this. For example, as shown by a two-dot chain line in FIGS. 11 and 17, a corner portion 31 </ b> F may be provided with a chamfered portion 32 ′ formed of a curved surface curved in an arc shape.

  In each of the above embodiments, the case where the counterweight 7 is provided with the screw seats 7B and 7B has been described as an example. However, the present invention is not limited to this. For example, as described in JP-A-10-237903, a lifting bracket or the like may be provided on the upper surface side of the counterweight.

  In each of the above embodiments, a hydraulic excavator has been described as an example of the construction machine. However, the present invention is not limited to this, and can be widely applied to various construction machines in which the rear portion of the engine cover is in contact with the upper surface of the counterweight, such as a wheeled hydraulic excavator and a hydraulic crane. Is.

1 is an overall view showing a hydraulic excavator according to a first embodiment of the present invention. It is the top view which looked at the upper turning body in FIG. 1 from the upper side. It is a perspective view which expands and shows the rear part side of an upper turning body. It is sectional drawing which looked at the opening part of a building cover, an engine cover, etc. from the arrow IV-IV direction in FIG. It is sectional drawing which shows the state which opened the engine cover in FIG. It is a perspective view which shows the state which opened the engine cover in FIG. It is a top view of the upper turning body which shows the state where the engine cover was opened. It is a left view of FIG. 7 which shows the state which opened the engine cover. FIG. 9 is a left side view substantially similar to FIG. 8 showing a state in which the counterweight is detached and attached. It is a perspective view which expands and shows the rear part side of the upper turning body by 2nd Embodiment. It is the top view which looked at the engine cover etc. in FIG. 10 from the upper side. It is a left view of FIG. 11 which shows the engine cover etc. of a closed door state. It is sectional drawing which looked at the opening part of a building cover, an engine cover, etc. from the arrow XIII-XIII direction in FIG. It is sectional drawing which shows the state which opened the engine cover in FIG. It is a perspective view which shows the state which opened the engine cover in FIG. It is a top view of the upper turning body which shows the state where the engine cover was opened. It is a left view of FIG. 16 which shows the state which opened the engine cover. FIG. 18 is a left side view that is substantially the same as FIG. 17 and shows a state in which the counterweight is detached.

Explanation of symbols

1 Excavator (construction machine)
2 Lower traveling body 3 Upper revolving body 4 Working device 5 Revolving frame (frame)
6 Cab 7 Counterweight 8 Building cover 8A Side cover 8B Upper cover 8C Opening 9 Engine 12, 31 Engine cover 12B, 31B Left side plate 12C, 31C Right side plate 12D, 31D Front plate 12E, 31E Rear plate 13, 33 Notch 14, 34 Mounting plate 15, 36 Hinge 16 Raised bracket 17 Seal member 31F Corner portion 32, 32 'Chamfered portion

Claims (3)

A frame of a vehicle body provided with a working device on the front side and a counterweight on the rear side, an engine mounted on the frame and positioned near the counterweight, and the engine standing on the frame and inside And a building cover provided with an opening for inspecting the engine at an upper portion thereof, and a part of the building cover that can be opened and closed on the building cover so as to cover the opening of the building cover. And an engine cover disposed on the upper side of the counterweight ,
Before SL engine cover, left, is rotatably connected with a hinge on one side of the upper surface of the housing cover in the right direction, it left and becomes the other side the free end of the right direction as a fulcrum of the hinge-side opening in the configuration and then formed by construction machine that,
The engine cover is provided such that, when closed, the lower surface of the engine cover comes into contact with the upper surface of the building cover and the upper surface of the counterweight.
Between the hinge attached to one side of the engine cover and the upper surface of the building cover, a raising bracket is provided for attaching the hinge in a state raised by a predetermined dimension from the upper surface of the building cover,
The hinge is attached to the engine cover at a position above the lower surface of the engine cover, with the raised bracket being raised by the predetermined dimension from the upper surface of the building cover,
When the engine cover is opened by a fulcrum the hinge construction machine, wherein a lower surface of the side portion after the engine cover is configured to be spaced from the upper surface of the counterweight. The raising bracket, a fixing plate portion which is fixed to the upper surface of the housing cover by a raised plate section the hinge is formed by raising the upper is attached taken while raising upward relative to the fixed plate portion The construction machine according to claim 1, which is configured . A frame of a vehicle body provided with a working device on the front side and a counterweight on the rear side, an engine mounted on the frame and positioned near the counterweight, and the engine standing on the frame and inside And a building cover provided with an opening for inspecting the engine at an upper portion thereof, and a part of the building cover that can be opened and closed on the building cover so as to cover the opening of the building cover. And an engine cover disposed on the upper side of the counterweight,
The engine cover includes an upper lid plate portion, left and right side plate portions located on both left and right sides of the lid plate portion, and front plate portions located on both front and rear sides of the lid plate portion. And a rear plate portion,
One side of the left side plate part or the right side plate part is pivotally connected to the upper surface of the building cover using a hinge, and the other side of the left side plate part or the right side plate part is a free end so that the hinge side is In construction machines that are configured to open and close as fulcrums,
The engine cover is provided such that when closed, the lower surfaces of the left plate portion, right plate portion, and front plate portion are in contact with the upper surface of the building cover, and the lower surface of the rear plate portion is in contact with the upper surface of the counterweight. And
Wherein the engine cover, forming a chamfered portion inclined at an angle in a boundary portion between the rear plate portion side and a side of said left side plate part hinge is attached or the right side plate portion,
The chamfer the hinge when opening the engine cover in the fulcrum, configured to form a gap between the upper surface of the front SL counterweight spaced above the upper surface of the counterweight and the engine cover Construction machinery characterized by that .

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