JP2021147771A - Construction machine - Google Patents

Abstract

To provide a construction machine capable of increasing the deterioration resistance while maintaining the strength of a hinge and reducing the thickness of the hinge when the hinge is closed.SOLUTION: A construction machine (1) includes a lower traveling body (3), an upper swivel body (5), a machine room (26), a door (30), and a hinge (31) that rotatably supports the door. The hinge has a first member (33), a second member (35), and a shaft (37). The first member includes a first flat plate portion (41), a first side plate (43) extending vertically from the upper and lower ends of the first flat plate portion, and a first through hole (46) formed in the first side plate and through which the shaft penetrates in the vertical direction. The second member includes a second flat plate portion (51), a second side plate (53) extending vertically from the upper and lower ends of the second flat plate portion, and a second through hole (56) formed in the second side plate and through which the shaft penetrates in the vertical direction. The first member and the second member are rotatably assembled to the shaft so that the second flat plate portion of the second member enters the space formed by the first flat plate portion of the first member and the pair of first side plates.SELECTED DRAWING: Figure 3

Description

The present invention relates to construction machinery, and particularly to hinges that open and close the machine room.

Generally, a hydraulic excavator that operates a front attachment to perform work such as excavating the ground is provided with a counterweight on the opposite side of the front attachment based on the position of the center of gravity so that the center of gravity is closer to the center in the front-rear direction of the aircraft. Has been done. The center of gravity of the hydraulic excavator can be positioned closer to the counterweight so that the counterweight is provided at a position farther from the center in the front-rear direction of the machine body.

However, there is a problem that the farther the counterweight is from the center of gravity of the hydraulic excavator, the larger the so-called turning radius, which is the maximum outer diameter when the upper swivel body is swiveled.
Therefore, a so-called small swivel machine has been developed in which the counterweight is located on the center side in the front-rear direction of the machine body by increasing the density of the counterweight as compared with a general hydraulic excavator, and the turning radius is relatively small.

In such a small swivel machine, the position of the counter weight is located on the center side in the front-rear direction of the machine body, so that the machine room such as the engine room in which the engine that generates the driving force of the hydraulic excavator is housed and the pump room in which the pump is arranged is provided. It tends to be narrower than a general hydraulic excavator.

On the other hand, in the machine room of a hydraulic excavator, the opening portion is covered with a door, and the machine room can be opened by opening the door. In order to enable the opening and closing of the door in this way, the door is provided on the airframe via a hinge. However, construction machines often operate in an environment where a relatively large amount of dust or the like flies, and it is conceivable that dust or the like may accumulate inside the hinge or rust may occur due to rain.
By the way, various hinges are used in construction machinery (Patent Documents 1 to 3).

Japanese Unexamined Patent Publication No. 2012-26246 Japanese Unexamined Patent Publication No. 2005-188219 Japanese Unexamined Patent Publication No. 2004-84207

As described above, since the machine room of a small swivel machine tends to be narrower than that of a general hydraulic excavator, the hinge of the door is disclosed in Patent Documents 1 to 3 in order to secure the space of the machine room. It needs to be smaller than the hinge to be used.

It is also possible to reduce the accumulation of dust and rust inside the hinge (dustproof measures), but taking dustproof measures on the hinge while maintaining its strength leads to an increase in the size of the hinge. There was a risk of reducing the space that can be effectively used in the machine room.

The present invention has been made in view of such a problem, and an object of the present invention is to improve the deterioration resistance while maintaining the strength of the hinge (dustproof measures), and to increase the thickness of the hinge when the hinge is closed. The purpose is to provide construction machinery that can be made smaller.

In order to achieve the above object, the construction machine of the present invention includes a self-propelled lower traveling body, an upper rotating body rotatably mounted on the lower traveling body, and a machine room provided in the upper rotating body. In a construction machine including a door covering the machine room and a hinge that rotatably supports the door on the upper swing body, the hinge is a first member fixed to the upper swing body. The first flat plate has a second member fixed to the door and a shaft that rotatably supports the first member and the second member, and the first member extends in the vertical direction of the machine body. A first penetration formed in each of a portion, a pair of first side plates extending in the vertical direction from the upper end and the lower end of the first flat plate portion, and the pair of first side plates, and the shaft penetrating in the vertical direction of the machine body. The second member includes a hole, a second flat plate portion extending in the vertical direction of the machine body, a pair of second side plates extending in the vertical direction from the upper and lower ends of the second flat plate portion, and the pair of second side plates. Each of the above includes a second through hole through which the shaft penetrates in the vertical direction of the machine body, and the first member and the second member when the door is closed so as to cover the machine chamber. The second flat plate portion of the second member is rotatably assembled to the shaft so as to enter the space formed by the first flat plate portion of the first member and the pair of first side plates. It is characterized by being.

As a result, the contact area between the shaft and the first side plate and the second side plate is reduced by forming the first through hole and the second through hole through which the shaft penetrates in the vertical direction of the machine body in the first side plate and the second side plate. It is possible to suppress the accumulation of dust and the like in the contact portion, and when the door is closed so as to cover the machine room, the second flat plate portion of the second member becomes a pair with the first flat plate portion of the first member. By allowing the hinge to enter the space formed by the first side plate of the above, it is possible to reduce the thickness when the hinge is closed while maintaining the strength of the hinge.

As another aspect, in the first member, the first flat plate portion is attached to the upper swing body by a fastening member, and the second side plate of the second member covers the machine room. It is preferable that an opening is formed at a position corresponding to the fastening member when the door is closed.

As a result, the fastening member and the second member for fastening the first member are formed by forming an opening in the second side plate of the second member at a position corresponding to the fastening member when the door is closed so as to cover the machine room. It is possible to prevent contact with.

As another aspect, the door is provided with a door frame located on the surface on the machine room side when the door is closed so as to cover the machine room, and the second member is the second member. The end of the side plate at a position separated from the second flat plate portion is fixed to the door frame, and the door frame is a frame convex portion protruding in a direction away from the door at a position where the second member is fixed. The first side plate has a shorter width extending from the first flat plate portion than the first rotation shaft portion on which the first through hole is formed, and the second side plate has the second side plate. It is preferable that the width extending from the second flat plate portion is shorter than that of the second rotating shaft portion in which the two through holes are formed.

As a result, the width extending from the first flat plate portion and the second flat plate portion of the first side plate and the second side plate is made shorter than that of the first rotating shaft portion and the second rotating shaft portion. The hinge can be attached so that the 1-rotating shaft portion and the 2nd rotating shaft portion avoid the door frame, and the thickness of the hinge can be reduced while maintaining the diameter of the shaft.

As another aspect, it is preferable that at least the upper end portion of the shaft in the vertical direction is welded in the first through hole of the first member.
This makes it possible to prevent rainwater or the like from entering the first through hole and the second through hole.

As another aspect, the second member is provided with a stopper member, and the stopper member is provided on the second side plate and projects from the end of the second member on the shaft side, and the first. It is preferable that the side plate and the second side plate come into contact with the first side plate when they form a predetermined angle.

As a result, the second stopper member is provided on the second side plate, projects from the end of the second member on the shaft side, and comes into contact with the first side plate when the first side plate and the second side plate form a predetermined angle. By providing the door on the member, it is possible to prevent the door from rotating more than necessary.

As another aspect, it is preferable that the first side plate is formed with a stopper recess recessed by a predetermined distance at a position where the stopper abuts.
As a result, by forming a stopper recess that is recessed by a predetermined distance at a position where the stopper abuts on the first side plate, it is possible to widen a predetermined angle that is a rotatable range of the door.

According to the construction machine of the present invention, the first through hole and the second through hole through which the shaft penetrates in the vertical direction of the machine body are formed in the first side plate and the second side plate. The contact area of the second member can be reduced to prevent the accumulation of dust and the like in the contact portion, and when the door is closed so as to cover the machine room, the second flat plate portion of the second member becomes the first member of the first member. Since it is made to enter the space formed by the flat plate portion and the pair of first side plates, the thickness when the hinge is closed can be reduced while maintaining the strength of the hinge. As a result, it is possible to increase the deterioration resistance while maintaining the strength of the hinge, and to reduce the thickness of the hinge when the hinge is closed.

It is a side view of a construction machine. It is a perspective view which looked at the rear part of the upper swing body from the left rear. It is a perspective view with the hinge open. It is a perspective view of the state in which the hinge is closed. It is a top view seen from the shaft side in a state where a hinge is closed. It is an enlarged view of the range A in FIG. It is a perspective view of the state which the hinge which concerns on 2nd Embodiment is open. It is a perspective view of the state in which the hinge is opened which concerns on another Example of 2nd Embodiment.

<First Embodiment>
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

With reference to FIG. 1, a side view of the construction machine 1 is shown. The construction machine 1 is a hydraulic excavator composed of a lower traveling body 3 and an upper swivel body 5. The lower traveling body 3 is a so-called crawler type self-propellable traveling body. The upper swivel body 5 is mounted on the lower traveling body 3 via a swivel shaft 7. As a result, the upper swivel body 5 can swivel around the swivel shaft 7 with respect to the lower traveling body 3. Further, the construction machine 1 is a so-called small swivel machine in which the rear end portion of the upper swivel body 5 is located on the swivel shaft 7 side (for example, inside the front-rear width L1 of the lower traveling body 3) as compared with a general hydraulic excavator. be.

The upper swivel body 5 has a front attachment 10, a cab 18, and a rear unit 20 mounted on a main frame 6 forming the bottom of the upper swivel body 5. The front attachment 10 extends from the center of the main frame 6 in the left-right direction to the front of the upper swivel body 5. The front attachment 10 is configured by disposing a boom 12, an arm 14, and a bucket 16 in order from the main frame 6.

In the front attachment 10, the boom 12 and the arm 14 are rotatably connected by the first joint 13, and the arm 14 and the bucket 16 are rotatably connected by the second joint 15. The main frame 6 By rotating the boom 12, the arm 14, and the bucket 16 at the first joint 13 and the second joint 15, excavation work and the like can be performed. The bucket 16 can be detached and replaced at the second joint 15, and can be replaced with a ripper, a breaker, a crusher, or the like.

The cab 18 is provided with a cockpit for an operator to board and operate the construction machine 1. The cab 18 is arranged on the left side in the left-right direction on the front side in the front-rear direction of the upper swivel body 5.

The rear unit 20 includes an engine 22 and a counterweight 24, and is arranged behind the front attachment 10 and the cab 18 in the upper swing body 5. The engine 22 is an internal combustion engine that generates the driving force of the lower traveling body 3 and the operating force of the front attachment 10. The counterweight 24 is a weight provided at the rear portion of the upper swing body 5 in order to prevent the upper swing body 5 from tilting forward when the front attachment 10 is viewed by the upper swing body 5 and extends forward.

With reference to FIG. 2, a perspective view of the rear portion of the upper swing body 5 as viewed from the left rear is shown. A machine room 26 is formed on the left side of the rear unit 20. In the machine room 26, for example, a device such as a pump 28 driven by the operation of the engine 22 is arranged. Here, in the construction machine 1 which is a small swivel machine, the rear end portion of the upper swivel body 5 is located on the swivel shaft 7 side as compared with a general hydraulic excavator, in other words, in the machine room 26 in the front-rear direction of the machine body. Tends to be narrower. A door 30 is arranged on the left side surface of the rear unit 20 via a hinge 31, and the left side of the machine room 26 is opened by rotating the door 30 around the hinge 31 to open and close the door 30. It can be covered by a door 30 or a door 30.

With reference to FIG. 3, a perspective view of the hinge 31 according to the first embodiment is shown. Further, referring to FIG. 4, a perspective view showing a state in which the hinge 31 according to the first embodiment is closed is shown. Further, referring to FIG. 5, a plan view seen from the shaft 37 side in a state where the hinge 31 according to the first embodiment is closed is shown.

The hinge 31 includes a first member 33, a second member 35, a shaft 37, and a washer 39. The first member 33 is a member having a substantially U-shaped cross section in the vertical direction in which the first flat plate portion 41, the first side plate 43, and the first rotating shaft portion 45 are formed. The first flat plate portion 41 is the main body of the first member 33, and is formed in a flat plate shape extending in the vertical direction. A bolt fastening hole 41a is formed in the first flat plate portion 41, and is fixed to the unit frame 20a described later of the rear unit 20 by the bolt 41b (see FIG. 4).

The first side plate 43 is formed in a flat plate shape so as to extend vertically from the upper end and the lower end of the first flat plate portion 41 and stand upright. The first side plate 43 is formed so that the upper end and the lower end of the first flat plate portion 41 are bent. The first rotating shaft portion 45 is formed at the end of the first side plate 43 on the shaft 37 side so that the outer peripheral edge R1 forms a perfect circle, and the first through hole 46 is formed in the center of the perfect circle. There is. The upper end and the lower end of the shaft 37 are welded to the first rotating shaft portion 45 through the first through hole 46. Here, the first side plate 43 is formed so that the width L2 extending from the first flat plate portion 41 is shorter than that of the first rotation shaft portion 45. Further, in the first member 33, a space S is formed by the first flat plate portion 41 and the upper and lower first side plates 43.

The second member 35 is a member having a substantially U-shaped cross section in the vertical direction in which the second flat plate portion 51, the second side plate 53, and the second rotating shaft portion 55 are formed. The second flat plate portion 51 is the main body of the second member 35, and is formed in a flat plate shape extending in the vertical direction. An elliptical opening 52 is formed in the second flat plate portion 51, and the bolt 41b is located in the opening 52 when the hinge 31 is closed (see FIG. 4).

The second side plate 53 is formed in a flat plate shape so as to extend vertically from the upper end and the lower end of the second flat plate portion 51 and stand upright. The second side plate 53 is formed so that the upper end and the lower end of the second flat plate portion 51 are bent. The second rotating shaft portion 55 is formed at the end of the second side plate 53 on the shaft 37 side so that the outer peripheral edge R2 forms a perfect circle, and the second through hole 56 is formed in the center of the perfect circle. There is. The upper end and the lower end of the shaft 37 penetrate the second through hole 56 in the second rotation shaft portion 55. Here, the second side plate 53 is formed so that the width L3 extending from the second flat plate portion 51 has the same length as the width L2 of the first side plate 43 and is shorter than the second rotation shaft portion 55. Has been done. Further, the second side plate 53 is located on the central side in the vertical direction with respect to the first side plate 43. As a result, the second member 35 can be located in the space S inside the first side plate 43 located at the upper end and the lower end of the first member 33 in the vertical direction.

The shaft 37 is a rod-shaped member extending in the vertical direction of the machine body. The shaft 37 penetrates the second rotating shaft portion 55 while rotatably supporting the second member 35. The washer 39 is disposed between the first rotating shaft portion 45 and the second rotating shaft portion 55, and penetrates the shaft 37. Therefore, in the hinge 31, the first member 33 and the second member 35 are relatively rotatably supported by the shaft 37. Further, the first member 33 and the second member 35 are supported by the shaft 37 so that the first side plate 43 and the second side plate 53 extend in the same direction when the hinge 31 is closed (see FIG. 4). ..

Therefore, the thickness of the hinge 31 can be reduced as compared with the case where the first side plate 43 and the second side plate 53 are positioned so as to extend in opposite directions (see Example 1 in FIG. 5). In particular, in the construction machine 1 which is a small swivel machine, it is necessary to effectively utilize the machine room 26. Therefore, by reducing the thickness of the hinge 31 in this way, a space that can be effectively used in the machine room 26 can be created. It can be secured well.

With reference to FIG. 6, an enlarged view of the range A in FIG. 2 is shown. In the hinge 31, the first member 33 is fixed to the unit frame 20a of the rear unit 20 by bolts 41b, and the second member 35 is welded to the reinforcement (door frame) 30a of the door 30. Here, the unit frame 20a is a skeleton member of the rear unit 20, and forms the front left end of the machine room 26. Further, the reinforcement 30a is a skeleton member of the door 30, and protrudes from a surface on the machine room 26 side (hereinafter, referred to as an inner surface of the door 30) when the door 30 covers the left side of the machine room 26. It is formed so as to have a convex shape extending in the vertical direction. In the reinforcement 30a, a convex portion (frame convex portion) 30b is formed at a position where the second member 35 of the hinge 31 is welded.

By the way, since reducing the diameter of the shaft 37 causes the entire hinge 31 to be distorted when it is distorted by an impact or the like, it is necessary to maintain the diameter of the shaft 37 in order to secure the strength of the shaft 37. Further, since it is necessary to secure the strength of the first rotating shaft portion 45 and the second rotating shaft portion 55 welded and penetrated through the shaft 37 in the same manner as the shaft 37, the outer peripheral edges R2 and R3 around the shaft 37. It is necessary to form so as to be. On the other hand, if the thickness when the hinge 31 is closed is large, it is necessary to dent the unit frame 20a toward the machine room 26 side in order to secure the position of the door 30 when the door 30 is closed, which narrows the machine room 26. It will be.

Here, in the hinge 31, the end portion 53a of the second side plate 53 is welded to the convex portion 30b of the reinforcement 30a. In other words, the width L2 of the first side plate 43 and the width L3 of the second flat plate portion 51 are formed to be smaller than the outer peripheral edges R2 and R3 of the first rotation shaft portion 45 and the second rotation shaft portion 55. Has been done.

Therefore, since the first rotation shaft portion 45 and the second rotation shaft portion 55 are attached so as to avoid the convex portion 30b of the reinforcement 30a, the diameter of the shaft 37 is not reduced and the first rotation is performed. Without reducing the shaft portion 45 and the second rotating shaft portion 55, the thickness of the position sandwiched between the hinge 31 reinforcement 30a and the unit frame 20a when the hinge 31 is closed can be reduced. Further, the hinge 31 can prevent the bolt 41b from interfering with the second side plate 53 when the hinge 31 is closed by forming the opening 52 in the second side plate 53 of the second member 35. can. As a result, the thickness of the hinge 31 when the hinge 31 is closed can be reduced.

Further, with such a configuration, the hinge 31 has a portion that slides when rotating, a portion where the second rotation shaft portion 55 of the second member 35 and the shaft 37 come into contact with each other, and a first rotation shaft portion. Since the 45, the second rotating shaft portion 55, and the washer 39 are in contact with each other, it is possible to reduce the resistance at the time of rotation and suppress the sticking due to deterioration such as rust. Further, since the first member 33 and the second member 35 are located via the washer 39, a gap corresponding to the thickness of the washer 39 can be provided between the first side plate 43 and the second side plate 53. Therefore, it is possible to prevent the first side plate 43 and the second side plate 53 from sliding, to satisfactorily reduce the resistance when rotating the hinge 31, and to suppress sticking due to deterioration such as rust. can.

The assembly procedure and the assembly procedure of the hinge 31 when assembling the hinge 31 to the reinforcement 30a will be described with reference to FIGS. 4 and 6. First, the end portion 53a of the second side plate 53 of the second member 35 is welded to the reinforcement 30a. Next, the first side plate 43 of the first member 33 is located on the upper side and the lower side of the second member 35, and is the center of the outer peripheral edges R1 and R2 of the first rotation shaft portion 45 and the second rotation shaft portion 55. Stack them so that C1 matches. At this time, the washer 39 is arranged between the first rotation shaft portion 45 and the second rotation shaft portion 55.

Next, the shaft 37 is arranged so as to pass through the first through hole 46, the second through hole 56, and the washer 39 formed in the first rotation shaft portion 45 and the second rotation shaft portion 55, and the shaft 37 is arranged. The upper end and the lower end are welded through the first through hole 46 of the first rotation shaft portion 45. By assembling and assembling in this way, the hinge 31 can be easily assembled to the reinforcement 30a and the hinge 31 can be assembled. In other words, the hinge 31 which has a simple structure, is small in size, has high deterioration resistance, and can secure strength can be easily assembled and assembled.

As described above, in the construction machine according to the first embodiment, the lower traveling body 3 capable of self-propelling, the upper swivel body 5 mounted on the lower traveling body 3 so as to be swivel, and the upper swivel body 5 are provided. In the construction machine 1 provided with the machine chamber 26, the door 30 covering the machine chamber 26, and the hinge 31 that rotatably supports the door 30 on the upper swing body 5, the hinge 31 is attached to the upper swing body 5. It has a first member 33 to be fixed, a second member 35 fixed to the door 30, and a shaft 37 that rotatably supports the first member 33 and the second member 35.

Further, the first member 33 includes a first flat plate portion 41 extending in the vertical direction of the machine body, and a pair of first side plates 43 extending in the direction perpendicular to the first flat plate portion 41 from the upper and lower ends of the first flat plate portion 41, respectively. Each of the pair of first side plates 43 includes a first through hole 46 through which the shaft 37 penetrates in the vertical direction of the machine body, and the second member 35 includes a second flat plate portion 51 extending in the vertical direction of the machine body and a first plate portion 51. A pair of second side plates 53 extending in the direction perpendicular to the second flat plate portion 51 from the upper and lower ends of the two flat plate portions 51 and a pair of second side plates 53, and a shaft 37 penetrating in the vertical direction of the machine body. 2 Through holes 56 and.

Then, in the first member 33 and the second member 35, the second flat plate portion 51 of the second member 35 enters the space formed by the first flat plate portion 41 of the first member 33 and the pair of first side plates 43. When the door 30 is closed so as to cover the machine room 26 rotatably assembled to the shaft 37, the door 30 extends in the same direction as the extension direction of the first side plate 43.

Therefore, the shaft 37 in which the second rotating shaft portion 55 formed so as to extend in the vertical direction with respect to the second flat plate portion 51 extending in the vertical direction of the machine body is rotatably supported by the shaft relative to the first member 33. Since the first through hole 46 and the second through hole 56 penetrating in the vertical direction of the machine body are formed in the first side plate 43 and the second side plate 53, the contact area between the shaft 37 and the first through hole 46 and the second through hole 56. Can be reduced to prevent the accumulation of dust and the like on the contact portion. Further, when the door 30 is closed so as to cover the machine room 26, the second flat plate portion 51 of the second member 35 is formed in the space formed by the first flat plate portion 41 of the first member 33 and the pair of first side plates 43. Since it is made to penetrate, the thickness when the hinge 31 is closed can be reduced while maintaining the strength of the hinge 31. Further, by welding the first rotating shaft portion 45 and the shaft 37, it is possible to prevent dust and rain from entering the gap between the second rotating shaft portion 55 and the shaft 37.

Then, in the first member 33, the first flat plate portion 41 is attached to the upper swing body 5 by a fastening member, and the door 30 is closed on the second side plate 53 of the second member 35 so as to cover the machine room 26. At that time, since the opening 52 is formed at a position corresponding to the fastening member, it is possible to prevent the fastening member for fastening the first member 33 from coming into contact with the second member 35.

The door 30 is provided with a reinforcement 30a located on the surface of the machine chamber 26 when the door 30 is closed so as to cover the machine chamber 26, and the second member 35 is the second side plate 53. The end portion 53a at a position separated from the second flat plate portion 51 is fixed to the reinforcement 30a, and the reinforcement 30a is a convex portion 30b protruding in a direction away from the door 30 at a position where the second member 35 is fixed. The width of the first side plate 43 extending from the first flat plate portion 41 is shorter than that of the first rotation shaft portion 45 in which the first through hole 46 is formed, and the second side plate 53 has a second side plate 53. Since the width extending from the second flat plate portion 51 is formed shorter than that of the second rotating shaft portion 55 in which the two through holes 56 are formed, the first rotating shaft portion 45 and the second rotating shaft portion 55 are formed. The hinge can be attached so as to avoid the door frame, and the thickness of the hinge 31 can be reduced while maintaining the diameter of the shaft 37.

Further, since at least the upper end portion of the shaft 37 in the vertical direction is welded through the first through hole 46 of the first member 33, rainwater or the like is welded to the first rotating shaft portion 45 and the second rotating shaft portion 55. It is possible to prevent the shaft 37 from entering the gap between the first through hole 46 and the second through hole 56.

<Second Embodiment>
With reference to FIG. 7, a perspective view of the hinge 131 according to the second embodiment is shown in an open state. Hereinafter, the second embodiment will be described with reference to FIG. 7. It should be noted that the description of the configuration and the action and effect common to the first embodiment will be omitted, and the parts different from the first embodiment will be described here.

The hinge 131 according to the second embodiment has a stopper recess 142 formed in the first flat plate portion 41 of the first member 33, and a stopper member 136 provided in the second flat plate portion 51 of the second member 35. 1 Different from the embodiment. The stopper recess 142 is a recess formed in the center of the end portion 42 on the shaft 37 side of the first flat plate portion 41 in the vertical direction, and is formed so as to be recessed by L4 by a predetermined distance from the end portion 42. The stopper member 136 is formed so that one end is welded to the second flat plate portion 51 of the second member 35 and the other end (the end on the shaft side) extends to a position where it contacts the stopper recess 142.

Here, when the hinge 131 is opened so that the stopper member 136 and the stopper recess 142 come into contact with each other, the angle formed by the first member 33 and the second member 35 is a predetermined angle θ. Further, since one end of the stopper member 136 is welded to the second flat plate portion 51 of the second member 35, the stopper member 136 rotates with the rotation of the second member 35. As a result, the hinge 131 can rotate to a position where the stopper member 136 and the stopper recess 142 come into contact with each other when the hinge 131 is opened from the closed state, and when the stopper member 136 and the stopper recess 142 come into contact with each other, the hinge 131 is further rotated. Cannot be opened. Therefore, the door 30 of the construction machine 1 provided with the hinge 131 according to the second embodiment does not rotate from a predetermined angle θ, so that it is prevented from rotating more than necessary and coming into contact with other parts or the like. Can be done.

With reference to FIG. 8, a perspective view of the hinge 231 according to another embodiment of the second embodiment is shown. The hinge 231 is different from the hinge 31 of the first embodiment in that the stopper member 236 is provided on the second flat plate portion 51 of the second member 35. Compared with the stopper member 136, the stopper member 236 is curved so that the other end is separated from the end portion 42 of the first flat plate portion 41 at a predetermined distance L4. That is, in the hinge 231 according to another embodiment of the second embodiment, the stopper member 236 is curved instead of forming the stopper recess 142. As a result, similarly to the hinge 131, the door 30 of the construction machine 1 provided with the hinge 231 does not rotate from a predetermined angle θ, so that it is prevented from rotating more than necessary and coming into contact with other parts or the like. be able to.

As described above, in the construction machine 1 according to the second embodiment, the second member 35 includes the stopper member 136, and the stopper member 136 is provided on the second side plate 53 and the shaft of the second member 35. It protrudes from the end on the 37 side and comes into contact with the first side plate 43 when the first side plate 43 and the second side plate 53 form a predetermined angle θ, so that the door 30 is prevented from rotating more than necessary. be able to.

Since the first side plate 43 is formed with a stopper recess 142 that is recessed by a predetermined distance L4 at a position where the stopper abuts, the predetermined angle θ that is a rotatable range of the door 30 can be widened.

The description of the construction machine according to the present invention is completed above, but the present invention is not limited to the above embodiment and can be changed without departing from the gist of the invention.

For example, in the present embodiment, the construction machine 1 has been described as a small swivel machine, but a general hydraulic excavator may be used.
Further, in the present embodiment, the hinge 31 is fixed to the unit frame 20a by a bolt 41b and fixed by welding to the reinforcement 30a. However, the hinge 31 is fixed by welding to the unit frame 20a and fixed to the reinforcement 30a by the bolt 41b. It may be fixed by.

1 Construction machinery 3 Lower traveling body 5 Upper swivel body 26 Machine room 30 Door 30a Reinforce (door frame)
30b Convex part (frame convex part)
31, 131 Hinge 33 1st member 35 2nd member 37 Shaft 41 1st flat plate part 43 1st side plate 45 1st rotation shaft part 46 1st through hole 51 2nd flat plate part 52 Opening 53 2nd side plate 55 2nd Moving shaft 56 2nd through hole 61 Main body (1st jig)
63 Mounting jig (second jig)
67a Mounting groove 136, 236 Stopper member 142 Stopper recess S space

Claims (6)

A self-propelled lower running body and
An upper swivel body that is mounted on the lower traveling body so as to be swivel
The machine room provided in the upper swivel body and
The door covering the machine room and
In a construction machine provided with a hinge that rotatably supports the door on the upper swing body.
The hinge is
The first member fixed to the upper swing body and
The second member fixed to the door and
It has a shaft that rotatably supports the first member and the second member.
The first member is
The first flat plate extending in the vertical direction of the machine and
A pair of first side plates extending in the vertical direction from the upper end and the lower end of the first flat plate portion, respectively.
A first through hole formed in each of the pair of first side plates and through which the shaft penetrates in the vertical direction of the machine body is included.
The second member is
The second flat plate extending in the vertical direction of the machine and
A pair of second side plates extending in the vertical direction from the upper end and the lower end of the second flat plate portion,
A second through hole formed in each of the pair of second side plates and through which the shaft penetrates in the vertical direction of the machine body is included.
When the door of the first member and the second member is closed so as to cover the machine room, the second flat plate portion of the second member becomes the first flat plate portion of the first member and the pair. A construction machine characterized in that it is rotatably assembled to the shaft so as to enter the space formed by the first side plate. In the first member, the first flat plate portion is attached to the upper swing body by a fastening member.
An opening is formed in the second side plate of the second member at a position corresponding to the fastening member when the door is closed so as to cover the machine room.
The construction machine according to claim 1, wherein the construction machine is characterized in that. The door is provided with a door frame that is located on the machine room side surface when the door is closed so as to cover the machine room.
The end of the second member at a position separated from the second flat plate portion of the second side plate is fixed to the door frame.
The door frame is formed with a frame convex portion that protrudes in a direction away from the door at a position where the second member is fixed.
The width of the first side plate extending from the first flat plate portion is shorter than that of the first rotation shaft portion on which the first through hole is formed.
The width of the second side plate extending from the second flat plate portion is shorter than that of the second rotation shaft portion on which the second through hole is formed.
The construction machine according to claim 1, wherein the construction machine is characterized in that. The shaft is formed by welding at least the upper end portion in the vertical direction at the first through hole of the first member.
The construction machine according to claim 1, wherein the construction machine is characterized in that. The second member is provided with a stopper member.
The stopper member is provided on the second side plate, projects from the end of the second member on the shaft side, and hits the first side plate when the first side plate and the second side plate form a predetermined angle. Be in contact
The construction machine according to claim 1, wherein the construction machine is characterized in that. The first side plate is formed with a stopper recess that is recessed by a predetermined distance at a position where the stopper member comes into contact with the first side plate.
The construction machine according to claim 5, wherein the construction machine is characterized in that.

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