JP2017155493A - Construction machine and engine cover installation method of construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction machine and an engine cover installation method of the construction machine, for improving workability in engine cover installation work.SOLUTION: A stay guide 25 extending in the longitudinal direction is provided between an openable-closable third engine cover 29 for covering a maintenance opening part 17A and an engine 8. A stay 36 for maintaining the third engine cover 29 in an opening state by being guided by the stay guide 25 when opening-closing the third engine cover 29, is provided between the third engine cover 29 and the stay guide 25. An upper face plate 29B of the third engine cover 29 is provided with a stay installing opening part (a discharge port 29B2) for installing the stay 36 in the third engine cover 29 and the stay guide 25 in a position corresponding to the stay 36 when the third engine cover 29 is a closed state. The discharge port 29B2 is provided with a duct 32 for discharging cooling air.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a construction machine such as a hydraulic excavator and a wheel loader, and more particularly to a construction machine provided with an engine cover that covers a mounted device such as an engine and a method of attaching an engine cover of the construction machine.

  Generally, a hydraulic excavator as a construction machine is a self-propelled lower traveling body, an upper revolving body that is turnable on the lower traveling body, and a working device that is capable of being raised and lowered on the front side of the upper revolving body. It is comprised by.

  On the rear side of the upper swing body, a building cover that covers a machine room that houses the equipment including the engine and the heat exchanger is provided. The building cover is composed of a left and right side plate and an upper plate having a maintenance opening for performing maintenance of the mounted equipment including the engine and the heat exchanger. The maintenance opening is provided with an engine cover that can be opened and closed (see, for example, Patent Documents 1, 2, and 3).

JP 2007-30602 A JP 2007-69673 A JP 2010-254021 A

  By the way, in recent years, the engine cover tends to increase in size as the number of mounted devices increases and the size increases due to compliance with exhaust gas regulations and the like. Therefore, when attaching the engine cover to the maintenance opening, a crane or the like must be used. The engine cover is attached by lifting the engine cover with a hook such as a crane and lifting it. The hinge provided on the engine cover is fastened to the body of the excavator (upper turning body) with bolts or the like. To do. In this case, when the engine cover is shaken, the hinge moves, so that the bolt fastening operation becomes difficult, and the workability of the engine cover mounting operation may be reduced.

  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 provide a construction machine and an engine cover attachment method for a construction machine that improve the workability of the engine cover attachment work.

  In order to solve the above-described problems, the construction machine of the present invention is provided on the rear side of the vehicle body frame in order to balance the work frame and the vehicle body frame on which the work device is mounted on the front side with a support structure. A counterweight, an engine that is positioned in front of the counterweight and that extends horizontally on the vehicle body frame, and a radiator that performs heat exchange of engine coolant for cooling the engine A building cover comprising a heat exchanger, a left side plate, a right side plate, and an upper side plate provided to cover the upper side of each side plate and having a maintenance opening for maintenance of the mounted equipment including the engine; and the building cover A support member provided at the rear edge of the maintenance opening and extending left and right, and the support part Between the engine cover and the engine, and an engine cover that is provided at a top end of the engine cover and that can open and close the maintenance opening of the upper surface plate of the building cover with the counterweight side as a rotation fulcrum. The engine cover is guided by the stay guide when the engine cover is opened and closed. The stay guide is provided between the engine cover and the stay guide. And a stay for keeping the door open.

  And, on the upper surface of the engine cover, when the engine cover is in a closed state, a stay attaching opening for attaching the stay to the engine cover and the stay guide is provided at a position corresponding to the stay. The stay mounting opening is provided with a duct for discharging cooling air for cooling a fluid such as the engine cooling water flowing in the heat exchanger.

  Further, the engine cover mounting method for a construction machine according to the present invention includes a vehicle body frame having a support structure and a work device attached to the front side, and a counter provided on the rear side of the vehicle body frame to balance the work device. A weight, an engine that is positioned on the front side of the counterweight and extends horizontally on the body frame and extends leftward and rightward; and a left side plate, a right side plate, and an upper side of each side plate. A building cover made of a top plate having a maintenance opening for performing maintenance of the mounted equipment including the engine, and is located at the rear edge of the maintenance opening of the building cover and extends left and right. A support member provided on the upper end of the support member via a hinge and the counterweight side as a rotation fulcrum; An engine cover capable of opening and closing the maintenance opening of the upper surface plate of the cover; and a stay provided on the inner surface side of the engine cover and above the engine and extending the maintenance opening forward and rearward. A guide, and a stay provided between the engine cover and the stay guide and guided by the stay guide when the engine cover is opened and closed to maintain the engine cover in an open state.

  And, when the engine cover is attached to the support member, a temporary fixing jig for temporarily fixing the engine cover to the support member in a state where the engine cover is closed is provided in the female screw hole for attaching the hinge of the support member. An engine cover temporary fixing step for inserting the engine cover into a temporarily fixed state by insertion, and an upper surface of the engine cover for attaching the stay to the engine cover and the stay guide with the engine cover closed. A stay attaching step for attaching the stay to the engine cover and the stay guide from the stay attaching opening, and maintaining the engine cover open by the stay and replacing the temporary fixing jig and the bolt. To attach the engine cover to the support member. Consisting of a Jinkaba mounting process.

  Further, the engine cover mounting method for a construction machine according to the present invention includes a vehicle body frame having a support structure and a work device attached to the front side, and a counter provided on the rear side of the vehicle body frame to balance the work device. A weight, an engine that is positioned on the front side of the counterweight and extends horizontally on the body frame and extends leftward and rightward; and a left side plate, a right side plate, and an upper side of each side plate. A building cover comprising a top plate having a maintenance opening for maintenance of the equipment including the engine, and a support provided at the rear edge of the maintenance opening and extending left and right A member, and an upper end of the support member. An engine cover capable of opening and closing the maintenance opening of the plate, a stay guide provided on the inner surface side of the engine cover and above the engine and extending the maintenance opening forward and rearward; And a stay provided between the engine cover and the stay guide and guided by the stay guide when the engine cover is opened and closed to maintain the engine cover in an open state.

  When the engine cover is attached to the support member, a positioning pin for temporarily fixing the engine cover to the support member in a closed state is a female screw hole for attaching the hinge among the support members. An engine cover temporary fixing step for temporarily fixing the engine cover by inserting the pin through a pin insertion hole formed at a separate position; and the engine cover and the stay guide with the stay in a state where the engine cover is closed A stay attaching step for attaching the stay to the engine cover and the stay guide from a stay attaching opening provided on an upper surface of the engine cover for attaching to the engine cover, and the positioning pin being inserted into the pin insertion hole. And the engine cover is kept open by the stay. And entered into a bolt to the support member for the hinge by screwing into the female screw hole, consisting of an engine cover mounting step of mounting the engine cover to the support member.

  According to the present invention, since the engine cover can be easily attached, the workability of the engine cover attaching operation can be improved.

1 is a front view showing a hydraulic excavator according to a first embodiment of the present invention. It is a top view which expands and shows an upper revolving body etc. FIG. 3 is a plan view showing a state where first, second, and third engine covers are removed from the upper swing body of FIG. 2. It is the perspective view seen from the front right side in the state which closed the 1st, 2nd, 3rd engine cover. It is a perspective view which shows the state which attached the temporary fixing jig to the hinge of the 3rd engine cover. It is the perspective view which looked at the state which suspended the 3rd engine cover with the suspension tool from the same position as FIG. FIG. 5 is a perspective view of a state in which the temporary fixing jig is inserted into the female screw hole of the support member and the third engine cover is temporarily fixed to the support member, as viewed from the same position as in FIG. 4. It is an expansion perspective view which expands and shows the (VIII) part in FIG. FIG. 5 is a perspective view of the state in which the third engine cover is opened after the stays are attached to the third engine cover and the stay guide from the stay attachment opening, as viewed from the same position as in FIG. 4. It is an expansion perspective view which expands and shows the (X) part in FIG. It is the perspective view which looked at the state which attached the 3rd engine cover to the support member by replacing a temporary fixing jig and a bolt from the same position as FIG. It is an expansion perspective view which expands and shows the (XII) part in FIG. It is a perspective view which shows a temporary fixing jig alone. It is the perspective view which looked at the 3rd engine cover and upper turning body by a 2nd embodiment of the present invention from the same position as Drawing 4. It is a perspective view similar to FIG. 5 which expands and shows the 3rd engine cover in FIG.

  Hereinafter, as a typical example of a construction machine according to an embodiment of the present invention, a crawler type hydraulic excavator will be described as an example, and will be described in detail according to the accompanying drawings.

  1 to 13 show a first embodiment of the present invention. The hydraulic excavator 1 is a self-propelled crawler-type lower traveling body 2, is pivotably mounted on the lower traveling body 2, and an upper revolving body 3 that forms a vehicle body together with the lower traveling body 2, and the upper revolving body It is comprised by the working device 4 which is provided in front of the body 3 and the front side of the back direction so that a vertical movement is possible, and performs the excavation work of earth and sand.

  The upper swing body 3 has a support structure and a swing frame 5 as a vehicle body frame to which the work device 4 is attached on the front side, and a counterweight 6 provided on the rear side of the swing frame 5 to balance the work device 4. A cab 7 that is provided on the left side of the front part of the turning frame 5 and on which the operator is boarded, an engine 8 that is located on the front side of the counterweight 6 and provided on the turning frame 5, and engine cooling water that cools the engine 8 A heat exchanger 10 including a radiator 10B that performs heat exchange, a building cover 14 that houses mounted devices such as the engine 8, the heat exchanger 10, and the post-processing unit 13 therein, and the engine cover 8 that is provided in the building cover 14 and heat A machine room cover 26 that covers the exchanger 10, the post-processing unit 13, and the like is generally configured.

  The engine 8 is mounted on the revolving frame 5 in a horizontally placed state located on the front side of the counterweight 6 and extending leftward and rightward. The engine 8 is supported on the revolving frame 5 in a vibration-proof state in a machine room 18 to be described later. A cooling fan 9 is provided on the left side of the engine 8 to supply cooling air to a heat exchanger 10 described later, as shown in FIG. On the other hand, on the right side of the engine 8, a hydraulic pump that is driven by the engine 8 and discharges hydraulic oil supplied from a hydraulic oil tank 11 (described later) as pressure oil toward a control valve device (not shown). (Not shown) is provided. The engine 8 is connected to an exhaust pipe 8A that guides exhaust gas discharged from the engine 8 to a post-processing unit 13 described later.

  The heat exchanger 10 is provided on the revolving frame 5 so as to be located on the left side in the longitudinal direction of the engine 8. As shown in FIG. 3, the heat exchanger 10 has a substantially rectangular shape that is long in the front and rear directions in plan view (as viewed from above), and is positioned on the left side of a machine room 18 to be described later. Face to face. The heat exchanger 10 includes a support frame 10A having a frame structure, and a radiator 10B, an oil cooler 10C, an intercooler 10D, and the like that are arranged in the front and rear directions inside the support frame 10A. .

  The radiator 10B cools the engine coolant whose temperature has increased by dissipating the heat of the engine coolant into the cooling air. The oil cooler 10C cools the operating oil whose temperature has increased by dissipating the heat of the operating oil into the cooling air. The intercooler 10D cools the air that the engine 8 takes in.

  The hydraulic oil tank 11 is located on the front side of the hydraulic pump and is provided on the right side of the revolving frame 5. The hydraulic oil tank 11 stores hydraulic oil for driving actuators provided in the lower traveling body 2, the work device 4, and the like. On the other hand, the fuel tank 12 is located on the front side of the hydraulic oil tank 11 and is provided on the revolving frame 5.

  The post-processing unit 13 is disposed above the hydraulic pump on the right side of the engine 8. The post-processing unit 13 is located on the right side of a machine room 18 to be described later and connected to the exhaust pipe 8A. The aftertreatment unit 13 oxidizes and removes carbon monoxide (CO), hydrocarbons (HC), etc. contained in the exhaust gas discharged from the engine 8 and purifies nitrogen oxides (NOx) contained in the exhaust gas. In addition, the noise of the exhaust gas is further reduced.

  The building cover 14 is provided on the revolving frame 5 between the cab 7 and the counterweight 6. The building cover 14 includes a left side plate 15, a right side plate 16, and a top plate 17 that covers the upper sides of the side plates 15 and 16.

  The left side plate 15 rises from the turning frame 5 between the cab 7 and the counterweight 6. At the upper end side of the left side plate 15, there is provided an intake port 15 </ b> A for taking in external air (cooling air) into a machine chamber 18 to be described later by driving the cooling fan 9. On the other hand, the right side plate 16 rises from the revolving frame 5 so as to face the post-processing unit 13 between the hydraulic oil tank 11 and the counterweight 6.

  The top plate 17 has a maintenance opening 17 </ b> A for performing maintenance of mounted equipment (such as the heat exchanger 10 and the post-processing unit 13) including the engine 8. The maintenance opening 17A is located on the front side of the counterweight 6 and has a rectangular shape extending in the left and right directions. In addition, on the top plate 17, an intake port 17 </ b> B for taking external air (cooling air) into a machine chamber 18 (described later) by driving the cooling fan 9 is parallel to the left and right intake ports 15 </ b> A of the left side plate 15. Is provided. Further, the top plate 17 is provided with a female screw hole 17C for attaching a first engine cover 27, which will be described later, spaced forward and rearward between the intake port 17B and the maintenance opening 17A, for example, a back nut, It is provided using a screw seat or the like.

  The machine room 18 is covered with a building cover 14 and accommodates mounted equipment including the engine 8, the heat exchanger 10, and the post-processing unit 13. The upper side of the machine room 18 is opened by a maintenance opening 17A, and is always covered (closed) by a machine room cover 26 described later. As shown in FIG. 3, the heat exchanger 10, the engine 8, and the post-processing unit 13 are arranged in the machine room 18 in order from the left side in the left direction and the left side in the right direction.

  The front support member 19 is provided on the front side (working device 4 side) of the machine room 18. The front support member 19 is formed in a substantially L shape whose upper end is bent forward, and is located at the front edge of the maintenance opening 17A and extends left and right. For example, the left end side of the front support member 19 is fixed to the support frame 10 </ b> A of the heat exchanger 10, and the right end side is fixed to the hydraulic oil tank 11. Further, a front end side of step 21 described later is attached to the center portion of the front support member 19.

  The rear support member 20 is provided on the rear side (counterweight 6 side) of the machine room 18. The rear support member 20 is formed in a substantially L shape with its upper end bent forward, and is located at the rear edge of the maintenance opening 17A and extends left and right. For example, the left end side of the rear support member 20 is fixed to the support frame 10 </ b> A of the heat exchanger 10, and the right end side is fixed to a support column rising from the revolving frame 5. The rear support member 20 constitutes a support member of the present invention.

  On the left side of the upper surface 20A of the rear support member 20, there are two female screw holes 20B for rotatably mounting a second engine cover 28, which will be described later, at two locations separated in the left and right directions, for example, a back nut. The back screw seat is used. On the other hand, on the right side of the upper surface 20A of the rear support member 20, two female screw holes 20C for rotatably mounting a third engine cover 29 (described later) are provided at two positions spaced apart in the left and right directions, for example. It is provided using a back nut, a back screw seat and the like. In this case, of the four female screw holes 20C spaced apart in the left and right directions, the two female screw holes 20C located inside are inserted into the temporary fixing jig 41 through which pins 41B of the temporary fixing jig 41 described later are inserted. Also functions as a hole.

  Step 21 is provided across the upper side of the engine 8 in the front and rear directions. This step 21 is provided in the vicinity of a boundary portion between a second engine cover 28 and a third engine cover 29 described later in the left and right directions of the machine room 18. Step 21 is for an operator, an operator, etc. to put his / her foot on when performing maintenance on the engine 8 or the like. The step 21 includes a front leg portion 22 attached to the front support member 19, a rear leg portion 23 attached to the rear support member 20, and a footrest portion 24 that connects the front leg portion 22 and the rear leg portion 23. It is comprised by.

  The footrest portion 24 faces the front plate 24B that is substantially L-shaped and long in the front and rear directions, the front plate 24B that rises from the front end of the upper plate 24A, and the front plate 24B that falls from the rear end of the upper plate 24A. The rear plate 24C includes a left plate 24D that rises from the left end of the upper plate 24A, and a right plate 24E that falls from the right end of the upper plate 24A and faces the left plate 24D.

  The stay guide 25 is formed on the right plate 24E of the footrest portion 24 so as to extend forward and backward. That is, the stay guide 25 is provided between a later-described third engine cover 29 and the engine 8 and extending in the front and rear directions through the maintenance opening 17A. The rear end of the stay guide 25 is provided with a first recess 25A that is recessed downward. A second recess 25B that is recessed downward is provided on the front side of the first recess 25A. That is, the first recess 25A and the second recess 25B are provided side by side in the front and rear directions. The other end side of a stay 36 described later is slidably attached to the stay guide 25. The left plate 24D of the footrest 24 is also formed with a stay guide (not shown) to which the other end of a stay (not shown) for the second engine cover 28 described later is slidably attached.

  The machine room cover 26 extends left and right on the upper surface plate 17 and covers the upper part of the machine room 18. That is, the machine room cover 26 is configured to cover the upper parts of the equipment such as the engine 8, the heat exchanger 10, and the post-processing unit 13 disposed in the machine room 18, and to open and close the maintenance opening 17A. The machine room cover 26 is divided into a first engine cover 27, a second engine cover 28, and a third engine cover 29.

  The first engine cover 27 constitutes the left side portion of the machine room cover 26. The first engine cover 27 is disposed above the heat exchanger 10 adjacent to the left side of the second engine cover 28. Thus, the first engine cover 27 covers the entire upper area of the heat exchanger 10 disposed in the machine room 18. The first engine cover 27 is attached to the female screw hole 17C of the upper surface plate 17 via a hinge (not shown). Thus, the first engine cover 27 can be opened and closed in the left and right directions with the left side plate 15 side as a rotation fulcrum (rotation end) and the machine room 18 side (right side) as a free end (opening and closing side). .

  The second engine cover 28 constitutes a central portion of the machine room cover 26. The second engine cover 28 is disposed between the first engine cover 27 and the third engine cover 29 and covers the entire upper area of the engine 8. The second engine cover 28 is attached to the female screw hole 20B of the rear support member 20 via a hinge (not shown). As a result, the second engine cover 28 can be opened and closed in the forward and rearward directions with the counterweight 6 side (rear side) as a rotation fulcrum (rotation end) and the machine room 18 side (front side) as a free end (opening / closing side). It has become.

  Next, the 3rd engine cover 29 which comprises the right side part of the machine room cover 26 is demonstrated.

  The third engine cover 29 is disposed above the post-processing unit 13 adjacent to the right side of the second engine cover 28. The third engine cover 29 constitutes the engine cover of the present invention. The third engine cover 29 can be opened and closed in the front and rear directions with the counterweight 6 side (rear side) as a rotation fulcrum (rotation end) and the machine room 18 side (front side) as a free end (opening / closing side). Yes.

  The third engine cover 29 includes a front plate 29A rising from the upper surface of the upper plate 17 and the hydraulic oil tank 11, an upper plate 29B extending from the upper end of the front plate 29A toward the rear (counterweight 6 side), The rear plate 29C that rises from the rear end of the face plate 29B and the right face plate 29D that rises from the right end of the upper plate 29B are formed in a box shape with the left and lower sides opened.

  The front plate 29A is provided with a striker 39 and a handle 30, which will be described later, side by side in the left and right directions. A circular discharge port 29B1 is formed on the rear end side of the upper surface plate 29B. A tail tube 31 is attached to the discharge port 29B1. Thus, the exhaust gas discharged from the engine 8 is purified by the post-processing unit 13 and then discharged to the outside through the tail pipe 31 from the discharge port 29B1.

  Further, a rectangular discharge port 29B2 extending in the front and rear directions is formed on the left end side of the upper surface plate 29B, and a rectangular discharge port 29B3 extending in the front and rear directions is formed on the right end side. In this case, the discharge port 29B2 also has a function as the stay mounting opening of the present invention. That is, the discharge port 29B2 is provided at a position corresponding to a later-described stay 36 when the third engine cover 29 is closed, and is also for attaching the stay 36 to the third engine cover 29 and the stay guide 25. .

  Accordingly, the discharge port 29B2 (stay mounting opening) is formed in a size that allows the operator's hand (arm), tool, and the like to be inserted therethrough. The work for attaching the stay 36 to the third engine cover 29 and the stay guide 25 (third engine cover attaching work) will be described in detail later.

  The discharge ports 29B1 and 29B2 are provided with ducts 32 that open toward the right side. The duct 32 is for discharging cooling air for cooling a fluid such as engine cooling water flowing in the heat exchanger 10. That is, the cooling air introduced into the machine room 18 from the intake port 15A of the left side plate 15 and the intake port 17B of the top plate 17 is discharged to the right from the discharge ports 29B1 and 29B2 via the duct 32 toward the right side. .

  A bracket 33 is provided on the inner surface 29C1 on the upper end side of the rear plate 29C. The bracket 33 is engaged with one end of a stay 36 described later so as to be rotatable. The bracket 33 includes a contact plate 33A that contacts the inner surface 29C1 of the rear plate 29C and is fixed by welding, a lower plate 33B that rises from the lower end of the contact plate 33A, and a right that rises from the right end of the contact plate 33A. It is comprised by the vertical board 33C. A through hole 33D that penetrates in the left and right directions is formed on the upper end side of the right vertical plate 33C. One end of a later-described stay 36 is inserted into the through hole 33D.

  A hinge attachment 29E extending in the left and right directions is fixed to the inner surface 29C1 on the lower end side of the rear plate 29C by welding or the like. For example, two hinges 34 made of metal, for example, are provided on the hinge attachment 29E so as to be separated in the left and right directions. In other words, each hinge 34 is attached to the inner surface 29C1 of the rear plate 29C via the hinge attachment 29E.

  As shown in FIGS. 5, 10, etc., each hinge 34 includes an engine cover side attachment portion 34 </ b> A attached to the hinge attachment 29 </ b> E of the third engine cover 29 and a support member side attachment attached to the rear support member 20. 34B and the rotation part 34C which connects the engine cover side attachment part 34A with respect to the support member side attachment part 34B so that rotation is possible. The engine cover side attachment portion 34A is fixed to the hinge attachment 29E by welding or the like.

  The support member-side mounting portion 34B is formed with two bolt insertion holes 34D that are spaced apart in the left and right directions. Each bolt insertion hole 34 </ b> D is formed at a position corresponding to each female screw hole 20 </ b> C provided in the rear support member 20. In this case, of the total four bolt insertion holes 34D formed in the two hinges 34 separated in the left and right directions, the two bolt insertion holes 34D located inside are provided on the temporary fixing jig 41 described later. It also functions as a temporary fixing jig through-hole through which the pin 41B penetrates. That is, among the four female screw holes 20C provided in the rear support member 20, the bolt insertion hole 34D formed at a position corresponding to the one functioning as the temporary fixing jig insertion hole is the temporary fixing jig through hole. Also works.

  Each hinge 34 is attached to the upper surface 20 </ b> A of the rear support member 20 by screwing a bolt 35 as a fastening member into each female screw hole 20 </ b> C of the rear support member 20. Accordingly, two hinges 34 of the third engine cover 29 are arranged spaced apart in the left and right directions of the rear support member 20, and each hinge 34 uses two bolts 35 for the rear support member 20. It is attached. As a result, the third engine cover 29 is rotatable in the front and rear directions with the lower end of the rear plate 29C as a rotation end and the front side of the lower end of the rear plate 29C as a free end.

  The right face plate 29D is provided with a discharge port 29D1 arranged in the front and rear directions. The discharge port 29D1 discharges the cooling air introduced into the machine chamber 18 from the intake port 15A of the left side plate 15 and the intake port 17B of the top plate 17 to the outside.

  The stay 36 is provided between the third engine cover 29 and the stay guide 25. The stay 36 is guided by the stay guide 25 when the third engine cover 29 is opened and closed to maintain the third engine cover 29 in an open state. Specifically, the stay 36 includes a long rod-shaped body 36A and one end side in the length direction of the rod-shaped body 36A (rear end side, rear surface plate 29C side of the third engine cover 29). And a sliding portion 36C formed by bending the other end side (front end side) of the rod-shaped body 36A toward the stay guide 25. ing.

  As shown in FIG. 8, a retaining pin insertion hole 36D is provided in the attachment portion 36B. The retaining pin insertion hole 36D is formed at a position facing the discharge port 29B2 (stay mounting opening) provided in the upper plate 29B of the third engine cover 29 when the third engine cover 29 is closed. ing. In other words, the retaining pin insertion hole 36D is formed such that when the third engine cover 29 is in the closed state, the axis of the retaining pin insertion hole 36D extends forward or rearward or toward the discharge port 29B2.

  As a result, the position of the retaining pin insertion hole 36D can be easily seen from the discharge port 29B2, and the attaching portion 36B is easily inserted into the through hole 33D of the bracket 33, and the retaining pin 37 is easily inserted into the retaining pin insertion hole 36D. It can be inserted. Therefore, it is possible to improve the workability of the attaching work for attaching the stay 36 to the bracket 33 of the third engine cover 29 and the stay guide 25 from the discharge port 29B2.

  The stay 36 is configured such that the mounting portion 36B is rotatably attached to the bracket 33, and the sliding portion 36C is slidably attached to the stay guide 25. In the stay 36, when the third engine cover 29 is opened, the sliding portion 36C slides (slides) the stay guide 25 rearward. The sliding portion 36 </ b> C of the stay 36 can maintain the open state of the third engine cover 29 by engaging with the first recess 25 </ b> A or the second recess 25 </ b> B of the stay guide 25.

  By engaging the sliding portion 36C with the first recess 25A, the opening angle of the third engine cover 29 can be set to 90 °, for example, and the sliding portion 36C is engaged with the second recess 25B. Thus, the opening angle of the third engine cover 29 can be set to 60 °, for example.

  The lock device 38 is provided between each engine cover 27, 28, 29 and the upper surface plate 17. That is, three locking devices 38 are provided spaced apart in the left and right directions. The locking device 38 locks the engine covers 27, 28, 29 with respect to the upper surface plate 17 in a state where the engine covers 27, 28, 29 are closed. The locking device 38 can be locked and unlocked as necessary.

  The lock device 38 includes a striker 39 provided on each engine cover 27, 28, 29 side and a latch 40 provided on the upper surface plate 17. Each engine cover 27, 28, 29 is fixed to the upper surface plate 17 by engaging the latch 40 with the striker 39. As a result, the engine covers 27, 28, and 29 can suppress rattling or lock the upper surface plate 17.

  Next, the temporary fixing jig 41 for temporarily fixing the third engine cover 29 to the rear support member 20 will be described.

  The temporary fixing jig 41 is attached to the hinge 34 of the third engine cover 29 when the third engine cover 29 is attached to the rear support member 20. As shown in FIG. 5, the temporary fixing jig 41 is inserted into the bolt insertion hole 34 </ b> D (temporary fixing jig through hole) of the hinge 34 before the third engine cover 29 is attached to the rear support member 20. is there. As shown in FIG. 13, the temporary fixing jig 41 includes, for example, a horizontal plate 41 </ b> A formed in a plate shape by a metal material, a resin material, or the like, and the horizontal plate 41 </ b> A positioned at both ends in the length direction of the horizontal plate 41 </ b> A. Pin 41 </ b> B extending downward from the top.

  The horizontal plate 41A connects between the hinge contact portions 41A1 and the hinge contact portions 41A1 that are located on both ends in the length direction and contact the support member side mounting portions 34B of the left and right hinges 34, respectively. It is comprised by the connection part 41A2. As shown in FIG. 5, the horizontal plate 41 </ b> A has a length dimension that can span between the left and right hinges 34. The hinge contact portion 41A1 is formed so that its width dimension is slightly smaller than the width dimension of the support member side mounting portion 34B of the hinge 34.

  Moreover, the magnet 42 is provided in the hinge contact part 41A1. Thus, when the temporary fixing jig 41 is attached to the left and right hinges 34, the magnet cover 42 fixes the engine cover side attachment portion 34 </ b> A and the support member side attachment portion 34 </ b> B via the magnet 42 with the magnetic force of the magnet 42. can do. That is, the closed state of the hinge 34 can be maintained.

  The pin 41B is fixed to the hinge contact portion 41A1 of the horizontal plate 41A by welding or the like. Further, the pin 41B is provided at a position corresponding to the bolt insertion hole 34D (temporary fixing jig through hole) of the left and right hinges 34. The outer diameter of the pin 41B is slightly smaller than the diameter of the bolt insertion hole 34D and the diameter of the female screw hole 20C (temporary fixing jig insertion hole) of the rear support member 20. Further, the pin 41B is inserted into the bolt insertion hole 34D of the hinge 34 and the female screw hole 20C of the rear support member 20 when the support member side mounting portion 34B of the hinge 34 is brought into contact with the rear support member 20. It is formed in the length dimension that can be.

  Accordingly, as shown in FIGS. 9 and 10, when the third engine cover 29 is temporarily fixed to the rear support member 20, the pin 41 </ b> B of the temporary fixing jig 41 is inserted into the bolt insertion holes of the left and right hinges 34. 34D and the female screw hole 20C of the rear support member 20 are inserted, so that the third engine cover 29 can be prevented from shaking.

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

  First, the operator gets on the cab 7 and operates the engine 8. The operator can drive the hydraulic excavator 1 by operating a travel operation lever (not shown) disposed in the cab 7 and operate a work operation lever (not shown). By doing so, excavation work of earth and sand can be performed using the work device 4.

  In addition, the operator and the worker go up on the upper surface plate 17 of the building cover 14 and perform maintenance of equipment mounted on the machine room 18 such as the engine 8 from a maintenance opening 17A formed in the upper surface plate 17. be able to. Accordingly, the maintenance opening 17A is provided with first, second and third engine covers 27, 28 and 29 capable of opening and closing the machine room 18.

  By the way, in the above-described prior art, when the engine cover is attached to the vehicle body in a factory or the like, the hinge provided on the engine cover is suspended downward by a lifting device such as a crane, and the engine cover is hung in an open state. Fasten with bolts on the top side. In this case, since the bolt fastening operation is performed while maintaining the state where the engine cover is suspended by the suspension tool, the engine cover is likely to be shaken. When the engine cover is shaken, the hinge moves, so that the bolt fastening operation becomes difficult, and the workability of the engine cover mounting operation may be reduced.

  Moreover, until the engine cover is attached to the upper surface side of the building cover, the crane must be exclusively used, and the work efficiency of the engine cover attaching work may be reduced. Further, when the stay is attached to the engine cover and the stay guide, the engine cover must be maintained in an open state, and there is a problem that workability of the engine cover attaching work is lowered.

  Therefore, in the present embodiment, a stay attachment opening (discharge port 29B2) is provided at a position corresponding to the stay 36 in the upper surface plate 29B of the engine cover (third engine cover 29). As a result, the stay 36 can be attached while the third engine cover 29 is closed, so that the workability of the attachment work of the third engine cover 29 can be improved.

  An attaching operation for attaching the third engine cover 29 to the rear support member 20 will be described with reference to FIGS.

  5 and 6 show the engine cover temporary fixing process of the present invention. In this engine cover temporary fixing step, when the third engine cover 29 is attached to the rear support member 20, a temporary fixing jig 41 for temporarily fixing the third engine cover 29 to the rear support member 20 in the closed state is provided. The third engine cover 29 is brought into a temporarily fixed state by being inserted into a temporary fixing jig insertion hole (female screw hole 20 </ b> C) formed at a position corresponding to the temporary fixing jig 41 in the support member 20.

  Specifically, as shown in FIG. 5, the worker attaches the temporary fixing jig 41 to the support member side attachment portion 34 </ b> B of the left and right hinges 34 in advance. That is, the temporary fixing jig 41 is inserted into the bolt insertion hole 34D (temporary fixing jig through hole) of each support member side mounting portion 34B. In this case, the hinge 34 is held in a closed state by the magnet 42 of the temporary fixing jig 41.

  Next, as shown in FIG. 6, the third engine cover 29 is hung in a closed state (with the upper surface plate 29 </ b> B up) and in a horizontal state by a hook (hanging tool) 100 of a crane or the like (not shown). In this case, the third engine cover 29 can be suspended by screwing the suspension bolt 101 into the female screw hole for attaching the tail tube 31 and the duct 32 to the upper surface plate 29B of the third engine cover 29. Thereby, since it is not necessary to newly provide a female screw hole or the like for suspending the third engine cover 29, the cost can be reduced.

  Then, by lowering the hook 100, the pin 41B of the temporary fixing jig 41 attached to the hinge 34 of the third engine cover 29 is inserted into the female screw hole 20C (temporary fixing jig insertion hole) of the rear support member 20. In this case, since the hinge 34 is held in a closed state by the magnet 42 of the temporary fixing jig 41, the pin 41B can be inserted into the female screw hole 20C of the rear support member 20 in a stable state. Moreover, since the operator can visually recognize the pin 41B from the discharge ports 29B2 and 29B3 formed in the upper surface plate 29B, the pin 41B can be easily inserted into the female screw hole 20C. Thereafter, the hook 100 and the suspension bolt 101 can be removed to place the third engine cover 29 in a temporarily placed state. Thereby, since a crane can be released at an early stage, the workability | operativity of the assembly operation | work of the hydraulic shovel 1 in a factory can be improved, for example.

  Next, FIGS. 7 and 8 show the stay attaching process of the present invention. In the stay attaching step, the third engine cover 29 is provided on the upper surface (upper surface plate 29B) of the third engine cover 29 in order to attach the stay 36 to the third engine cover 29 and the stay guide 25 with the third engine cover 29 closed. The stay 36 is attached to the third engine cover 29 and the stay guide 25 from the stay attachment opening (discharge port 29B2).

  Specifically, as shown in FIG. 7, the sliding portion 36C of the stay 36 is inserted into the front end portion of the stay guide 25 from the discharge port 29B2 formed in the upper surface plate 29B of the third engine cover 29, and the sliding portion 36C. Is slidably engaged with the stay guide 25. Next, the mounting portion 36B of the stay 36 is inserted through the through hole 33D of the bracket 33 provided on the inner surface 29C1 of the rear plate 29C of the third engine cover 29.

  In this case, as shown in FIG. 8, the retaining pin insertion hole 36D formed in the mounting portion 36B of the stay 36 faces the discharge port 29B2. Thereby, the retaining pin insertion hole 36D is easily visible from the discharge port 29B2. Therefore, since the operator can easily insert the retaining pin 37 into the retaining pin insertion hole 36D, the workability of the stay mounting operation can be improved.

  Further, the stay 36 can be attached to the bracket 33 of the third engine cover 29 and the stay guide 25 from the discharge port 29B2 when the third engine cover 29 is closed. This eliminates the need for the worker to attach the stay 36 while keeping the third engine cover 29 open, so that the stay 36 can be easily attached between the third engine cover 29 and the stay guide 25. The workability and stability of the stay 36 can be improved.

  Next, FIGS. 9 to 12 show an engine cover attaching process of the present invention. In this engine cover attaching step, the third engine cover 29 is attached to the rear support member 20 by maintaining the open state of the third engine cover 29 by the stay 36 and replacing the temporary fixing jig 41 and the bolt 35.

  Specifically, as shown in FIG. 9, the third engine cover 29 is lifted upward by gripping the handle 30 provided on the front plate 29A of the third engine cover 29, and the hinge 34 is used as a rotation fulcrum. Open the engine cover 29. In this case, since the temporary fixing jig 41 is attached to the left and right hinges 34, the third engine cover 29 can be opened stably without being shaken. The sliding portion 36C of the stay 36 moves the stay guide 25 toward the rear. The third engine cover 29 can be maintained in the open state of approximately 90 ° by engaging the sliding portion 36C with the first recess 25A.

  Next, as shown in FIG. 10, the bolt 35 is inserted into the bolt insertion hole 34D of the hinge 34 through which the pin 41B of the temporary fixing jig 41 is not inserted, and is screwed into the female screw hole 20C. In this case, the temporary fixing jig 41 is inserted through the bolt insertion holes 34 </ b> D located inside the left and right directions of the hinges 34, and is attached across both the left and right hinges 34. Therefore, the third engine cover 29 is suppressed from shaking and rattling. As a result, the bolts 35 can be easily screwed into the female screw holes 20C without aligning the bolt insertion holes 34D located on the left and right outer sides of the hinges 34 with the female screw holes 20C of the rear support member 20. Therefore, the workability of the bolt fastening operation can be improved.

  After that, as shown in FIGS. 11 and 12, the temporary fixing jig 41 is removed from the hinge 34, and the bolt 35 is inserted into the bolt insertion hole 34D through which the pin 41B of the temporary fixing jig 41 has been inserted to support the rear. The member 20 is screwed into the female screw hole 20C. In this case, since the bolts 35 are already attached to the bolt insertion holes 34D positioned on the left and right sides of the hinges 34, the third engine cover 29 is removed even if the temporary fixing jig 41 is removed from the hinges 34. Shaking and rattling are suppressed. As a result, the bolts 35 can be easily screwed into the female screw holes 20C without aligning the bolt insertion holes 34D located on the left and right inner sides of the hinges 34 with the female screw holes 20C of the rear support member 20. Therefore, the workability of the bolt fastening operation can be improved.

  2 and 4, the tail pipe 31 is attached to the outlet 29B1 formed in the upper surface plate 29B of the third engine cover 29, and the duct 32 is attached to the outlets 29B2 and 29B3, respectively.

  Thus, according to the present embodiment, since the stay mounting opening (discharge port 29B2) is provided in the upper surface plate 29B of the third engine cover 29, the third engine cover 29 temporarily placed from the discharge port 29B2 A stay 36 can be attached to the stay guide 25. As a result, after the third engine cover 29 is temporarily placed on the maintenance opening 17A by the hook 100 and the hook 100 is removed, the open state of the temporarily placed third engine cover 29 is maintained by the stay 36 and the third engine cover 29 is maintained. The hinge 34 of the cover 29 can be bolted to the rear support member 20.

  Accordingly, the hook 100 (crane) can be released earlier than the case where the hinge 34 is bolted to the rear support member 20 in a state where the third engine cover 29 is suspended by the hook 100. The workability of the work for attaching to the vehicle body can be improved.

  Further, for example, when the discharge port 29B2 is not provided, the stay must be attached while the engine cover is kept open, and the worker must attach the stay while pressing the engine cover. However, the stay 36 can be attached to the third engine cover 29 and the stay guide 25 without opening the third engine cover 29 by the discharge port 29B2 formed in the third engine cover 29. Thereby, the stay 36 can be easily attached to the third engine cover 29 and the stay guide 25, so that the workability of the stay 36 can be improved.

  Further, a duct 32 for discharging cooling air for cooling a fluid such as engine cooling water flowing in the heat exchanger 10 is provided at the discharge port 29B2 (stay mounting opening). As a result, the stay mounting opening for mounting the stay 36 and the discharge port 29B2 for discharging the cooling air are also used, so that the cost can be reduced.

  In addition, two hinges 34 are spaced apart in the left and right directions of the rear support member 20, and each hinge 34 is attached to the rear support member 20 using two bolts 35. Thereby, the 3rd engine cover 29 can be supported stably.

  The retaining pin insertion hole 36D formed in the mounting portion 36B of the stay 36 is formed at a position facing the discharge port 29B2 when the third engine cover 29 is closed. This makes it easy for the operator to visually recognize the retaining pin insertion hole 36D from the discharge port 29B2, so that the retaining pin 37 can be easily inserted into the retaining pin insertion hole 36D, and the stay mounting operation can be performed. Workability can be improved.

  Further, when the third engine cover 29 is attached to the rear support member 20, the temporary attachment jig 41 attached to the hinge 34 of the third engine cover 29 is inserted into the temporary attachment jig insertion hole (female screw hole) of the rear support member 20. 20C), the third engine cover 29 is temporarily fixed. Further, the temporary fixing jig 41 is attached to both of the hinges 34 separated to the left and right.

  Thereby, when the third engine cover 29 is in the open state, the swing of the third engine cover 29 can be suppressed, and the third engine cover 29 is positioned. 29 hinges 34 can be bolted to the rear support member 20. Therefore, the workability of the mounting operation of the third engine cover 29 can be improved.

  Further, the temporary fixing jig 41 does not newly provide a through hole for the temporary fixing jig 41 in the hinge 34 and the rear support member 20, and the bolt insertion hole 34 </ b> D of the hinge 34 and the female screw hole 20 </ b> C of the rear support member 20. And use. Thereby, since the existing hinge 34 and the rear support member 20 can be used, cost can be reduced. Further, since the temporary fixing jig 41 is detachable from the hinge 34, one temporary fixing jig 41 can be used for the plurality of third engine covers 29, and the cost can be reduced.

  Next, FIG. 14 and FIG. 15 show a second embodiment of the present invention. A feature of this embodiment is that a positioning pin that protrudes toward the rear support member is provided on the hinge of the third engine cover, and a pin insertion hole through which the positioning pin is inserted is provided in the rear support member. 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.

  Two hinges 51 are provided spaced apart in the left and right directions of the hinge attachment 29 </ b> E provided on the inner surface 29 </ b> C <b> 1 of the rear plate 29 </ b> C of the third engine cover 29. The hinge 51 includes an engine cover side attachment portion 51A attached to the hinge attachment 29E of the third engine cover 29, a support member side attachment portion 51B attached to the rear support member 20, and the engine cover side attachment portion 51A on the support member side. It is comprised by the rotation part 51C connected so that rotation with respect to the attaching part 51B is possible.

  The engine cover side attachment portion 51A is fixed to the hinge attachment 29E by welding or the like. On the other hand, two bolt insertion holes 51D are formed in the support member side attachment portion 51B so as to be spaced apart in the left and right directions. Each bolt insertion hole 51 </ b> D is formed at a position corresponding to each female screw hole 20 </ b> C provided in the rear support member 20. Moreover, the magnet 52 is provided between each bolt penetration hole 51D in the support member side attaching part 51B. And the positioning pin 53 is provided in contact surface 51B1 contact | abutted to the upper surface 20A of the rear support member 20 among the support member side attaching parts 51B. The positioning pin 53 is located between the left and right bolt insertion holes 51D and protrudes from the contact surface 51B1 of the support member side mounting portion 51B toward the rear support member 20.

  The pin insertion hole 54 is provided at a position different from the female screw hole 20 </ b> C in the rear support member 20. The pin insertion holes 54 are provided so as to penetrate upward and downward at positions corresponding to the positioning pins 53 provided in the hinges 51. A positioning pin 53 provided on the hinge 51 is inserted into the pin insertion hole 54. Accordingly, the third engine cover 29 can be temporarily placed on the rear support member 20.

  Next, attachment work for attaching the third engine cover 29 to the rear support member 20 will be described.

  First, in the engine cover temporary fixing step, when the third engine cover 29 is attached to the rear support member 20, the third engine cover 29 is suspended by the hook 100 in a closed state and temporarily fixed to the rear support member 20. The third engine cover 29 is temporarily fixed by inserting the positioning pin 53 into a pin insertion hole 54 formed at a position different from the female screw hole 20C for attaching the hinge 51 in the rear support member 20. In this case, since the hinge 51 is held in the closed state by the magnet 52, the positioning pin 53 can be inserted into the pin insertion hole 54 of the rear support member 20 in a stable state.

  In the next stay attaching step, the third engine cover 29 is closed in order to attach the stay 36 to the third engine cover 29 and the stay guide 25 with the third engine cover 29 closed, as in the first embodiment described above. A stay 36 is attached to the third engine cover 29 and the stay guide 25 from a stay attachment opening (discharge port 29B2) provided on the upper surface (upper surface plate 29B) of the engine cover 29.

  In the next engine cover mounting step, the positioning pin 53 is inserted into the pin insertion hole 54 and the third engine cover 29 is kept open by the stay 36, and the bolt 35 is connected to the bolt insertion hole 51D of the hinge 51. And the third engine cover 29 is attached to the rear support member 20 by fastening the hinge 51 to the rear support member 20.

  Thus, also in the second embodiment, the same operations and effects as those in the first embodiment can be obtained. In particular, in the second embodiment, since the positioning pin 53 for temporary fixing is fixed to the hinge 51 provided on the third engine cover 29, the positioning pin 53 does not fall off the hinge 51, and the third The engine cover 29 can be temporarily placed on the rear support member 20 stably.

  Further, since the third engine cover 29 can be attached to the rear support member 20 with the positioning pins 53 being inserted into the pin insertion holes 54 of the rear support member 20, the work of attaching the third engine cover 29 is performed. Can be improved.

  In the above-described first embodiment, the case where two hinges 34 are provided apart from each other in the left and right directions of the third engine cover 29 has been described as an example. However, the present invention is not limited to this, and for example, three or more hinges 34 may be provided spaced apart in the left and right directions of the third engine cover 29. The same applies to the second embodiment.

  Each hinge 34 has been described as an example in which the hinge 34 is attached to the rear support member 20 using two bolts 35. However, the present invention is not limited to this. For example, each hinge 34 may be attached to the rear support member 20 using three or more bolts 35. The same applies to the second embodiment.

  Further, in the first embodiment described above, the case where the temporary fixing jig 41 is configured by the horizontal plate 41A and the pin 41B fixed to the horizontal plate 41A has been described as an example. However, the present invention is not limited to this. For example, two pin members as temporary fixing jigs are prepared, and one pin member is inserted into the bolt insertion hole 34D of the left hinge 34, and another pin is inserted. The member may be inserted into the bolt insertion hole 34D of the right hinge 34, and the third engine cover 29 may be temporarily fixed to the rear support member 20 by these pin members.

  In the above-described embodiment, the hydraulic excavator 1 including the crawler type lower traveling body 2 is described as an example of the construction machine. However, the present invention is not limited to this, and may be applied to, for example, a hydraulic excavator provided with a wheel-type lower traveling body. Besides, it can be widely applied to other construction machines such as wheel loaders and hydraulic cranes.

1 Excavator (construction machine)
4 Working device 5 Turning frame (body frame)
6 Counterweight 8 Engine (equipped equipment)
10 Heat exchanger (equipped equipment)
10B Radiator 13 Post-processing unit (equipped equipment)
14 Building Cover 15 Left Side Plate 16 Right Side Plate 17 Top Plate 17A Maintenance Opening 20 Rear Support Member (Support Member)
20C female screw hole 25 Stay guide 29 Third engine cover (engine cover)
29B2 outlet (stay mounting opening)
29C1 inner surface 32 duct 33 bracket 34, 51 hinge 34A, 51A engine cover side mounting portion 34B, 51B support member side mounting portion 34C, 51C rotating portion 35 bolt (fastening member)
36 stay 36A rod-like body 36B mounting portion 36D retaining pin insertion hole 37 retaining pin 41 temporary fixing jig 53 positioning pin 54 pin insertion hole

Claims (6)

A vehicle body frame having a support structure and a work device attached to the front side;
A counterweight provided on the rear side of the vehicle body frame for balancing with the working device;
An engine that is positioned in front of the counterweight and is provided in a horizontally placed state extending left and right on the body frame;
A heat exchanger including a radiator that performs heat exchange of engine coolant for cooling the engine;
A building cover comprising a left side plate, a right side plate, and an upper plate having a maintenance opening for covering the upper side of each side plate and maintaining the equipment including the engine,
A support member provided at the rear edge of the maintenance opening of the building cover and extending left and right; and
An engine cover which is provided at the upper end of the support member via a hinge and which can open and close the maintenance opening of the upper surface plate of the building cover with the counterweight side as a rotation fulcrum;
A stay guide provided between the engine cover and the engine and extending the maintenance opening in the front and rear directions;
In a construction machine comprising a stay that is provided between the engine cover and the stay guide and that is guided by the stay guide to open and close the engine cover when the engine cover is opened and closed.
The upper surface of the engine cover is provided with a stay attachment opening for attaching the stay to the engine cover and the stay guide at a position corresponding to the stay when the engine cover is in a closed state.
A construction machine characterized in that a duct for discharging cooling air for cooling a fluid such as the engine cooling water flowing in the heat exchanger is provided in the stay mounting opening.   The at least two hinges are spaced apart in the left and right directions of the support member, and each hinge is attached to the support member using at least two fastening members. Construction machinery as described in. On the inner surface side of the engine cover, a bracket is rotatably engaged with one end of the stay,
The stay has a long rod-shaped body and a mounting portion formed by bending the one end side in the length direction of the rod-shaped body,
The mounting portion of the stay is provided with a retaining pin insertion hole through which a retaining pin for suppressing the stay from coming off from the bracket is inserted,
The construction machine according to claim 1, wherein the retaining pin insertion hole is formed at a position facing the stay attaching opening when the engine cover is in a closed state. The hinge includes an engine cover side mounting portion attached to the engine cover, a support member side mounting portion attached to the support member, and the engine cover side mounting portion rotatable relative to the support member side mounting portion. It consists of a rotating part to be connected,
The support member side mounting portion is provided with a positioning pin protruding toward the support member,
The construction machine according to claim 1, wherein the support member includes a female screw hole for attaching the hinge and a pin insertion hole at a position corresponding to the positioning pin. A vehicle body frame having a support structure and a work device attached to the front side;
A counterweight provided on the rear side of the vehicle body frame for balancing with the working device;
An engine that is positioned in front of the counterweight and is provided in a horizontally placed state extending left and right on the body frame;
A building cover comprising a left side plate, a right side plate, and an upper plate having a maintenance opening for covering the upper side of each side plate and maintaining the equipment including the engine,
A support member provided at the rear edge of the maintenance opening of the building cover and extending left and right; and
An engine cover which is provided at the upper end of the support member via a hinge and which can open and close the maintenance opening of the upper surface plate of the building cover with the counterweight side as a rotation fulcrum;
A stay guide provided on the inner surface side of the engine cover and above the engine and extending the maintenance opening in the front and rear directions;
In an engine cover mounting method for a construction machine, comprising: a stay provided between the engine cover and the stay guide, and a stay guided by the stay guide to maintain the engine cover in an open state when the engine cover is opened and closed. ,
When the engine cover is attached to the support member, a temporary fixing jig for temporarily fixing the engine cover to the support member in a state where the engine cover is closed is inserted into a female screw hole for attaching the hinge of the support member. An engine cover temporary fixing step of temporarily setting the engine cover in a state;
In order to attach the stay to the engine cover and the stay guide with the engine cover closed, the stay is attached to the engine cover and the stay guide from a stay attaching opening provided on the upper surface of the engine cover. A stay mounting process for mounting;
An engine cover mounting method for a construction machine, comprising: an engine cover mounting step for mounting the engine cover to the support member by maintaining the open state of the engine cover by the stay and replacing the temporary fixing jig and the bolt. A vehicle body frame having a support structure and a work device attached to the front side;
A counterweight provided on the rear side of the vehicle body frame for balancing with the working device;
An engine that is positioned in front of the counterweight and is provided in a horizontally placed state extending left and right on the body frame;
A building cover comprising a left side plate, a right side plate, and an upper plate having a maintenance opening for covering the upper side of each side plate and maintaining the equipment including the engine,
A support member provided at the rear edge of the maintenance opening and extending left and right; and
An engine cover which is provided at the upper end of the support member via a hinge and which can open and close the maintenance opening of the upper surface plate of the building cover with the counterweight side as a rotation fulcrum;
A stay guide provided on the inner surface side of the engine cover and above the engine and extending the maintenance opening in the front and rear directions;
In an engine cover mounting method for a construction machine, comprising: a stay provided between the engine cover and the stay guide, and a stay guided by the stay guide to maintain the engine cover in an open state when the engine cover is opened and closed. ,
When the engine cover is attached to the support member, a positioning pin for temporarily fixing the engine cover to the support member in a state where the engine cover is closed is separate from the female screw hole for attaching the hinge among the support members. An engine cover temporary fixing step in which the engine cover is temporarily fixed by being inserted into a pin insertion hole formed at a position;
In order to attach the stay to the engine cover and the stay guide with the engine cover closed, the stay is attached to the engine cover and the stay guide from a stay attaching opening provided on the upper surface of the engine cover. A stay mounting process for mounting;
The hinge pin is fastened to the support member by screwing a bolt into the female screw hole while maintaining the engine cover open by the stay while the positioning pin is inserted into the pin insertion hole. And an engine cover attaching method for a construction machine, comprising an engine cover attaching step for attaching the engine cover to the support member.

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