JP7233393B2 - construction machinery - Google Patents

Description

The present invention relates to construction machinery, and more particularly to a hinge for opening and closing a machine room.

In general, a hydraulic excavator that operates the front attachment to excavate the ground is equipped with a counterweight on the opposite side of the center of gravity from the front attachment in order to bring the center of gravity closer to the center in the longitudinal direction of the machine body. It is This counterweight can position the center of gravity of the hydraulic excavator closer to the counterweight as the counterweight is provided at a position farther away 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 turning body is turned.
Therefore, a so-called small swing machine has been developed in which the density of the counterweight is increased compared to that of a general hydraulic excavator so that the counterweight is positioned at the center in the front-rear direction of the machine body and the turning radius is relatively small.

In such a small swing machine, the position of the counterweight is positioned at the center in the front-rear direction of the machine body, so there are machine rooms such as an engine room that houses the engine that generates the driving force of the hydraulic excavator and a pump room that arranges the pump. It tends to be narrower than a general hydraulic excavator.

On the other hand, the machine room of the hydraulic excavator has an opening covered with a door, and the machine room can be opened by opening the door. The doors are provided on the fuselage through hinges so that the doors can be opened and closed in this way. However, construction machinery often operates in an environment where a relatively large amount of dust and the like scatters, and it is conceivable that dust and the like may accumulate inside the hinges, and rust may occur due to rain.
By the way, various hinges are used in construction machines (Patent Documents 1 to 3).

JP 2012-26246 A JP 2005-188219 A JP-A-2004-84207

As described above, the small swing machine tends to have a narrower machine room than a general hydraulic excavator. It is necessary to make it smaller than the hinge that is used.

In addition, it is possible to reduce the accumulation of dust and rust inside the hinge (dustproof measures), but taking dustproof measures to the hinge while maintaining its strength will lead to an increase in size of the hinge. There is a risk of shrinking the space that can be effectively used in the machine room.

The present invention has been made in view of such problems, and its purpose is to increase the deterioration resistance while maintaining the strength of the hinge (measures against dust), and to reduce the thickness of the hinge when the hinge is closed. To provide a construction machine that can be made smaller.

In order to achieve the above object, the construction machine of the present invention comprises: a self-propelled undercarriage; an upper revolving body rotatably mounted on the undercarriage; and a machine room provided in the upper revolving body. and a door that covers the machine room, and a hinge that rotatably supports the door on the upper revolving body, wherein the hinge includes a first member that is fixed to the upper revolving body. , a second member fixed to the door, and a shaft rotatably supporting the first member and the second member, the first member being a first flat plate extending in the vertical direction of the vehicle body. a pair of first side plates extending vertically from the upper and lower ends of the first flat plate portion; and a first through-hole formed in each of the pair of first side plates, through which the shaft penetrates in the vertical direction of the fuselage. and a hole, wherein the second member includes a second flat plate portion extending in the vertical direction of the fuselage, a pair of second side plates extending vertically from the upper and lower ends of the second flat plate portion, and the pair of second side plates. and a second through hole formed in each of the above, through which the shaft penetrates in the vertical direction of the fuselage, wherein the first member and the second member cover the machine room when the door is closed, The first side plate and the second side plate extend vertically from the first plate portion and the second plate portion, respectively, in the same direction, and the second plate portion of the second member extends in the same direction as the first plate portion. It is rotatably assembled to the shaft so as to enter into a space formed by the first flat plate portion and the pair of first side plates.

As a result, the contact area between the shaft and the first and second side plates is reduced by forming the first and second through-holes through which the shaft penetrates in the vertical direction of the fuselage in the first and second side plates. When the door is closed so as to cover the machine room , the first side plate and the second side plate contact the first flat plate portion and the second flat plate, respectively. and extending in the same direction perpendicularly from the portion so that the second flat plate portion of the second member enters into the space formed by the first flat plate portion of the first member and the pair of first side plates, thereby It is possible to reduce the thickness when the hinge is closed while maintaining the strength of the hinge.

As another aspect, the first member has the first flat plate portion attached to the upper revolving body by a fastening member, and the second flat plate portion of the second member is provided so as to cover 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, by forming an opening in the second flat plate portion 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 fastening member that fastens the first member and the second It is possible to prevent contact with the member.

As another aspect, the door is provided with a door frame positioned on the machine room side surface when the door is closed so as to cover the machine room, and the second member comprises the second An end portion of the side plate spaced apart from the second flat plate portion is fixed to the door frame, and the door frame has a frame projection projecting in a direction away from the door at a position where the second member is fixed. is formed, the width of the first side plate extending from the first flat plate portion is shorter than that of the first rotating shaft portion in which the first through hole is formed, and the second side plate is formed of the It is preferable that the width extending from the second flat plate portion is formed to be 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 rotation shaft portion and the second rotation shaft portion. The hinge can be attached so that the first rotation shaft portion and the second rotation 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 in the vertical direction of the shaft is welded to 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, the stopper member is provided on the second flat plate portion , protrudes from an end portion of the second member on the shaft side, It is preferable that the first member and the second member come into contact with the first flat plate portion when forming a predetermined angle.

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

As another aspect, it is preferable that the first flat plate portion is formed with a stopper concave portion recessed by a predetermined distance at a position where the stopper abuts.
Accordingly, by forming the stopper concave portion recessed by a predetermined distance at the position where the stopper abuts on the first flat plate portion , it is possible to widen the predetermined angle within which the door can be rotated.

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. By reducing the contact area of the contact portion, it is possible to suppress the accumulation of dust and the like in the contact portion. and the second flat plate portion extending in the same direction in the vertical direction so that the second flat plate portion of the second member enters into the space formed by the first flat plate portion of the first member and the pair of first side plates. Therefore, it is possible to reduce the thickness when the hinge is closed 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. FIG. 4 is a perspective view of the rear portion of the upper rotating body as viewed from the rear left. FIG. 4 is a perspective view of the hinge in an open state; FIG. 4 is a perspective view of the hinge closed; FIG. 4 is a plan view seen from the shaft side in a state where the hinge is closed; 3 is an enlarged view of area A in FIG. 2; FIG. It is a perspective view of the state in which the hinge according to the second embodiment is opened. FIG. 11 is a perspective view of a hinge opened according to another example of the second embodiment;

<First embodiment>
An embodiment of the present invention will be described below with reference to the drawings.

Referring to FIG. 1, a side view of construction machine 1 is shown. The construction machine 1 is a hydraulic excavator composed of a lower running body 3 and an upper revolving body 5 . The lower traveling body 3 is a so-called crawler-type self-propelled traveling body. The upper revolving body 5 is mounted on the lower traveling body 3 via a revolving shaft 7 . Thereby, the upper swing body 5 can swing around the swing shaft 7 with respect to the lower traveling body 3 . The construction machine 1 is a so-called small swing machine in which the rear end portion of the upper swing body 5 is located closer to the swing shaft 7 (for example, inside the longitudinal width L1 of the lower traveling body 3) compared to a general hydraulic excavator. be.

The upper swing structure 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 swing structure 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 revolving body 5 . The front attachment 10 has a boom 12 , an arm 14 and a bucket 16 arranged in this order from the main frame 6 .

The front attachment 10 has a boom 12 and an arm 14 rotatably connected at a first joint 13 , and an arm 14 and a bucket 16 rotatably connected at a second joint 15 . , the first joint 13, and the second joint 15, respectively, to rotate the boom 12, the arm 14, and the bucket 16, so that 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, and the like.

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

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

Referring to FIG. 2, a perspective view of the rear portion of the upper rotating body 5 as seen from the rear left is shown. A machine room 26 is formed on the left side of the rear unit 20 . The machine room 26 is provided with devices such as a pump 28 driven by the operation of the engine 22, for example. Here, in the construction machine 1, which is a small swing machine, the rear end portion of the upper swing body 5 is positioned closer to the swing shaft 7 than in a general hydraulic excavator. width tends to be narrower. A door 30 is provided on the left side of the rear unit 20 via a hinge 31, and the left side of the machine room 26 can be opened by rotating the door 30 around the hinge 31 to open and close it. or the door 30.

Referring to FIG. 3, a perspective view of the state in which the hinge 31 according to the first embodiment is opened is shown. Also, referring to FIG. 4, a perspective view of a state in which the hinge 31 according to the first embodiment is closed is shown. Furthermore, 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 has a first member 33 , a second member 35 , a shaft 37 and a washer 39 . The first member 33 is formed with the first flat plate portion 41, the first side plate 43, and the first rotating shaft portion 45, and is substantially U-shaped when viewed in cross section in the vertical direction. 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 the first flat plate portion 41 is fixed to a unit frame 20a (described later) of the rear unit 20 with a bolt 41b (see FIG. 4).

The first side plate 43 is formed in a flat plate shape so as to vertically extend from the upper and lower ends of the first flat plate portion 41 . The first side plate 43 is formed by bending the upper and lower ends of the first flat plate portion 41 . 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 lower end of the shaft 37 are welded to the first rotating shaft portion 45 through the first through holes 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 rotating shaft portion 45 . A space S is formed in the first member 33 by the first flat plate portion 41 and the upper and lower first side plates 43 .

The second member 35 is a substantially U-shaped member in which the second flat plate portion 51, the second side plate 53, and the second rotating shaft portion 55 are formed, as viewed in cross section in the vertical direction. 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 positioned 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 vertically extend from the upper and lower ends of the second flat plate portion 51 . The second side plate 53 is formed by bending the upper and lower ends of the second flat plate portion 51 . 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 lower end of the shaft 37 pass through the second through hole 56 of the second rotating shaft portion 55 . Here, the second side plate 53 is formed so that the width L3 extending from the second flat plate portion 51 is the same length as the width L2 of the first side plate 43 and is shorter than the second rotation shaft portion 55. It is In addition, the second side plate 53 is positioned closer to the center in the vertical direction than the first side plate 43 . Thereby, the second member 35 can be positioned in the space S inside the first side plate 43 positioned 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 aircraft. The shaft 37 passes through the second rotating shaft portion 55 while rotatably supporting the second member 35 . The washer 39 is arranged between the first rotating shaft portion 45 and the second rotating shaft portion 55 and penetrated by the shaft 37 . Therefore, the hinge 31 is supported by the shaft 37 such that the first member 33 and the second member 35 are relatively rotatable. 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 compared to 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 swing machine, it is necessary to effectively utilize the machine room 26. Therefore, by reducing the thickness of the hinge 31 in this way, the space that can be effectively utilized in the machine room 26 is reduced. can be secured well.

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

By the way, 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. In addition, the first rotating shaft portion 45 and the second rotating shaft portion 55 that are welded to and penetrated by the shaft 37 need to have the same strength as the shaft 37. It must be formed so that On the other hand, if the thickness of the hinge 31 when closed is large, the unit frame 20a needs to be recessed toward the machine room 26 in order to secure the position of the door 30 when the door 30 is closed, and the machine room 26 is narrowed. It will happen.

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. It is

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 shaft portion 45 and the second rotation shaft portion 55 are mounted. The thickness of the portion of the hinge 31 sandwiched between the reinforcement 30a and the unit frame 20a when the hinge 31 is closed can be reduced without making the shaft portion 45 and the second rotation shaft portion 55 smaller. Further, the hinge 31 has an opening 52 formed in the second flat plate portion 51 of the second member 35, thereby preventing the bolt 41b from interfering with the second flat plate portion 51 when the hinge 31 is closed. be able to. This makes it possible to reduce the thickness of the hinge 31 when the hinge 31 is closed.

In addition, with such a configuration, the hinge 31 has a sliding portion when it rotates, a portion where the second rotating shaft portion 55 of the second member 35 and the shaft 37 contact, and a first rotating shaft portion. 45, the second rotating shaft portion 55, and the washer 39 are contacting portions, it is possible to reduce the resistance during rotation and to suppress sticking due to deterioration such as rust. In addition, since the first member 33 and the second member 35 are positioned with the washer 39 interposed therebetween, 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, favorably reduce the resistance when the hinge 31 rotates, and suppress the sticking due to deterioration such as rust. can.

The procedure for assembling the hinge 31 to the reinforcement 30a and the procedure for assembling the hinge 31 will be described with reference to FIGS. 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 plates 43 of the first member 33 are positioned above and below the second member 35, and the centers of the outer peripheral edges R1 and R2 of the first rotation shaft portion 45 and the second rotation shaft portion 55 Overlap 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 and the second through hole 56 formed in the first rotating shaft portion 45 and the second rotating shaft portion 55 and the washer 39, and the shaft 37 is The upper end and lower end are welded at the first through hole 46 of the first rotating 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, it is possible to easily install and assemble the hinge 31 which has a simple structure, is compact, has high resistance to deterioration, and can ensure strength.

As described above, in the construction machine according to the first embodiment, the lower traveling body 3 that can travel by itself, the upper revolving body 5 that is rotatably mounted on the lower traveling body 3, and the a door 30 covering the machine room 26; and a hinge 31 rotatably supporting the door 30 on the upper revolving body 5. It has a fixed first member 33 , 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 fuselage, a pair of first side plates 43 extending in a direction perpendicular to the first flat plate portion 41 from the upper end and the lower end of the first flat plate portion 41, respectively, A first through hole 46 is formed in each of the pair of first side plates 43 and through which the shaft 37 penetrates in the vertical direction of the fuselage. A pair of second side plates 53 extending in a direction perpendicular to the second flat plate portion 51 from the upper and lower ends of the two flat plate portions 51, and a second side plate 53 formed on each of the pair of second side plates 53, through which the shaft 37 penetrates in the vertical direction of the fuselage. 2 through-holes 56;

The first member 33 and the second member 35 are arranged so that 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 . Moreover, when the door 30 is closed so as to cover the machine room 26 which is rotatably assembled to the shaft 37, it extends in the same direction as the first side plate 43 extends.

Therefore, the shaft 37 supports the second rotating shaft portion 55 extending in the vertical direction with respect to the second flat plate portion 51 extending in the vertical direction of the machine body so as to be relatively rotatable with 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 is can be reduced to prevent dust and the like from accumulating at 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 positioned within the space formed by the first flat plate portion 41 of the first member 33 and the pair of first side plates 43. Since the hinge 31 is inserted into the hinge 31, it is possible to reduce the thickness of the hinge 31 when it is closed while maintaining the strength of the hinge 31.例文帳に追加In addition, by welding the first rotation shaft portion 45 and the shaft 37 together, dust and rain can be prevented from entering the gap between the second rotation shaft portion 55 and the shaft 37 .

The first member 33 has the first flat plate portion 41 attached to the upper revolving body 5 by a fastening member, and the second flat plate portion 51 of the second member 35 is provided with the door 30 so as to cover the machine room 26 . Since the opening 52 is formed at a position corresponding to the fastening member when closed, the fastening member for fastening the first member 33 and the second member 35 can be prevented from coming into contact with each other.

The door 30 is provided with a reinforcement 30 a positioned on the side of the machine room 26 when the door 30 is closed so as to cover the machine room 26 . An end portion 53a at a position spaced from the second flat plate portion 51 is fixed to a reinforcement 30a, and the reinforcement 30a has a convex portion 30b projecting in a direction away from the door 30 at a position where the second member 35 is fixed. is formed, the first side plate 43 has a shorter width extending from the first flat plate portion 41 than the first rotation shaft portion 45 in which the first through hole 46 is formed, and the second side plate 53 has a Since the width extending from the second flat plate portion 51 is formed shorter than that of the second rotation shaft portion 55 in which the two through holes 56 are formed, the first rotation shaft portion 45 and the second rotation shaft portion 55 are 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. - 特許庁

In addition, since the shaft 37 has at least the upper end portion in the vertical direction welded to the first through hole 46 of the first member 33, rainwater or the like can and the gaps between the shaft 37 and the first through hole 46 and the second through hole 56 can be suppressed.

<Second embodiment>
Referring to FIG. 7, a perspective view of a state in which the hinge 131 according to the second embodiment is opened is shown. The second embodiment will be described below with reference to FIG. Note that the description of the configuration and effects common to those of the first embodiment will be omitted, and the portions different from those of the first embodiment will be described here.

A hinge 131 according to the second embodiment is second in that a stopper recess 142 is formed in the first flat plate portion 41 of the first member 33 and a stopper member 136 is provided in the second flat plate portion 51 of the second member 35 . Differs from one embodiment. The stopper recessed portion 142 is a recessed portion formed in the vertical center of the end portion 42 of the first flat plate portion 41 on the shaft 37 side, and is formed to be recessed from the end portion 42 by a predetermined distance L4. 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 concave portion 142 .

Here, when the hinge 131 is opened so that the stopper member 136 and the stopper concave portion 142 are in contact with each other, the angle formed by the first member 33 and the second member 35 is a predetermined angle θ. 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 together with the rotation of the second member 35 . As a result, when the hinge 131 is opened from a closed state, it can be rotated to a position where the stopper member 136 and the stopper recessed portion 142 abut. cannot be opened. Therefore, since the door 30 of the construction machine 1 provided with the hinge 131 according to the second embodiment does not rotate more than the predetermined angle θ, it can be prevented from rotating more than necessary and coming into contact with other parts. can be done.

Referring to FIG. 8, there is shown a perspective view of the hinge 231 opened according to another example of the second embodiment. The hinge 231 differs from the hinge 31 of the first embodiment in that a 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 thereof is separated from the end portion 42 of the first flat plate portion 41 by a predetermined distance L4. That is, in the hinge 231 according to another example of the second embodiment, the stopper member 236 is curved instead of the stopper concave portion 142 being formed. As with the hinge 131, the door 30 of the construction machine 1 provided with the hinge 231 does not rotate beyond the predetermined angle θ, thereby preventing the door 30 from rotating more than necessary and coming into contact with other parts. 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, the stopper member 136 is provided on the second flat plate portion 51 , and the second member 35 Since it protrudes from the end on the shaft 37 side and comes into contact with the first flat plate portion 41 when the first member 33 and the second member 35 form a predetermined angle θ, the door 30 is prevented from rotating more than necessary. can be prevented.

Since the first flat plate portion 41 is formed with a stopper recess 142 recessed by a predetermined distance L4 at a position where the stopper abuts, the predetermined angle θ within which the door 30 can be rotated can be widened.

Although the construction machine according to the present invention has been described above, the present invention is not limited to the above-described embodiments, and can be modified without departing from the gist of the invention.

For example, in the present embodiment, the construction machine 1 is described as a small swing machine, but it may be a general hydraulic excavator.
Further, in the present embodiment, the hinge 31 is fixed to the unit frame 20a by the bolt 41b and is welded to the reinforcement 30a. may be fixed by

REFERENCE SIGNS LIST 1 construction machine 3 lower running body 5 upper revolving body 26 machine room 30 door 30a reinforcement (door frame)
30b convex portion (frame convex portion)
31, 131 hinge 33 first member 35 second member 37 shaft 41 first flat plate portion 43 first side plate 45 first rotation shaft portion 46 first through hole 51 second flat plate portion 52 opening 53 second side plate 55 second Drive shaft portion 56 Second through hole 61 Main body (first jig)
63 mounting jig (second jig)
67a Attachment groove 136, 236 Stopper member 142 Stopper concave portion S Space

Claims (6)

a self-propelled undercarriage;
an upper rotating body rotatably mounted on the lower traveling body;
a machine room provided in the upper revolving body;
a door covering the machine room;
a hinge that rotatably supports the door on the upper revolving body,
The hinge is
a first member fixed to the upper rotating body;
a second member fixed to the door;
a shaft that rotatably supports the first member and the second member;
The first member is
a first flat plate portion extending in the vertical direction of the fuselage;
a pair of first side plates extending vertically from the upper end and the lower end of the first flat plate portion;
a first through-hole formed in each of the pair of first side plates, through which the shaft penetrates in the vertical direction of the fuselage;
The second member is
a second flat plate portion extending in the vertical direction of the fuselage;
a pair of second side plates extending vertically from the upper and lower ends of the second flat plate;
a second through-hole formed in each of the pair of second side plates, through which the shaft penetrates in the vertical direction of the fuselage;
The first member and the second member are configured such that when the door is closed to cover the machine room , the first side plate and the second side plate are perpendicular to the first flat plate portion and the second flat plate portion, respectively. and extending in the same direction such that the second flat plate portion of the second member extends into the space formed by the first flat plate portion of the first member and the pair of first side plates. A construction machine characterized by being rotatably assembled to a The first member has the first flat plate portion attached to the upper revolving body by a fastening member,
An opening is formed in the second flat plate portion 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, characterized by: The door is provided with a door frame positioned on the side of the machine room when the door is closed so as to cover the machine room,
The second member is fixed to the door frame at an end portion spaced apart from the second flat plate portion of the second side plate,
The door frame is formed with a frame convex portion projecting 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 rotating shaft portion in which the first through hole is formed;
The second side plate has a width extending from the second flat plate portion that is shorter than that of the second rotation shaft portion in which the second through hole is formed,
The construction machine according to claim 1, characterized by: At least the upper end in the vertical direction of the shaft is welded to the first through hole of the first member,
The construction machine according to claim 1, characterized by: The second member is provided with a stopper member,
The stopper member is provided on the second flat plate portion , protrudes from an end portion of the second member on the shaft side, and is configured to stop the first flat plate portion when the first member and the second member form a predetermined angle. comes in abutment with
The construction machine according to claim 1, characterized by: The first flat plate portion is formed with a stopper recess recessed by a predetermined distance at a position where the stopper member abuts,
The construction machine according to claim 5, characterized in that:

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