Work machine

Abstract

To provide a work machine that can sufficiently assist in opening a bonnet with a compact structure.SOLUTION: In a work machine 100, a bonnet 302 covers a motor 303 mounted on a machine body frame 301. The bonnet 302 is rotatable about a first axis A1 extending in a left-right direction. The work machine 100 comprises an extendable and retractable energization mechanism 1 and a connecting member 2. The energization mechanism 1 energizes the bonnet 302 in response to rotation of the bonnet 302. The connecting member 2 connects one end of the energization mechanism 1 to the bonnet 302. The other end of the energization mechanism 1 is rotatably connected about a second axis A2 extending in a left-right direction with respect to the machine body frame 301. An interval between a first connecting portion C1 of the bonnet 302 and the connecting member 2 and a second connecting portion C2 of the energization mechanism 1 and the connecting member 2 is variable depending on the rotation of the bonnet 302.SELECTED DRAWING: Figure 6C

Description

[Technical field]

[0001] The present invention relates to a work machine. [Background technology]

[0002] Conventionally, there is known a working machine equipped with a spring mechanism that assists in opening and closing a bonnet that covers an engine. For example, in a working machine disclosed in Patent Document 1, a torsion coil spring is wound around a rotating shaft of the bonnet to assist in opening and closing the bonnet. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2022-085492 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above-mentioned spring mechanism, in order to obtain a large assist force when the bonnet starts to open, it is necessary to arrange a large torsion coil spring, which increases costs. Also, in the case of a small work machine, the position of the fulcrum when opening and closing the bonnet is close to the engine, which tends to cause problems in the design of the arrangement of the large torsion coil spring.

[0005] In view of the above circumstances, an object of the present invention is to provide a work machine that has a compact structure and can sufficiently assist in opening the hood. [Means for solving the problem]

[0006] In order to achieve the above object, in a work machine according to one aspect of the present invention, a bonnet covers a prime mover mounted on a machine frame. The bonnet is rotatable around a first axis extending in the left-right direction. The work machine includes an extendable and retractable biasing mechanism and a connecting member. The biasing mechanism biases the bonnet in response to rotation of the bonnet. The connecting member connects one end of the biasing mechanism to the bonnet. The other end of the biasing mechanism is connected to the machine frame so as to be rotatable around a second axis extending in the left-right direction. The distance between a first connecting portion of the bonnet and the connecting member and a second connecting portion of the biasing mechanism and the connecting member is variable in response to rotation of the bonnet.

[0007] Further features and advantages of the present invention will become apparent from the following embodiments. Effect of the Invention

[0008] According to the present invention, it is possible to provide a work machine that has a compact structure and is capable of sufficiently assisting in opening the hood. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a side view showing a configuration example of a hydraulic excavator. [Diagram 2] FIG. 2 is a cross-sectional view of the upper rotating body as viewed from above. [Figure 3A] 4 is a cross-sectional view of the upper rotating body seen from the right side with the bonnet closed. FIG. [Figure 3B] 4 is a cross-sectional view of the upper rotating body seen from the right side with the bonnet open. FIG. [Figure 4A] 4 is a cross-sectional view of the upper rotating body seen from the left side with the bonnet closed. FIG. [Figure 4B] 4 is a cross-sectional view of the upper rotating body seen from the left side with the bonnet open. FIG. [Diagram 5] FIG. 2 is a perspective view of an upper rotating body seen from an oblique front side with the bonnet open. [Figure 6A]5 is a schematic diagram of the biasing mechanism and the connecting member when the bonnet is closed. FIG. [Figure 6B] 5 is a schematic diagram of the biasing mechanism and the connecting member when the hood is open. FIG. [Figure 6C] 13 is a schematic diagram of the biasing mechanism and the connecting member in a state in which the bonnet is opened by a rotation amount equal to or greater than a threshold value. [Figure 7] 6 is a graph showing an example of change in biasing force of a biasing mechanism according to a rotation amount when the bonnet is opened. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0011] <1. Hydraulic Excavator 100> FIG. 1 is a side view showing an example of the configuration of a hydraulic excavator 100. The hydraulic excavator 100 is an example of the "work machine" of the present invention. FIG. 1 shows the hydraulic excavator 100 as viewed from the right side. As shown in FIG. 1, the hydraulic excavator 100 includes a lower traveling body 200, an upper rotating body 300, and a work machine 400.

[0012] Here, directions in this specification are defined as follows. First, the direction in which the lower running body 200 moves straight is the front-rear direction, one side of which is the "front" and the other side is the "rear". In addition, the horizontal direction perpendicular to the front-rear direction is the left-right direction. In this specification, the side that is left when looking from the rear to the front is the "left side", and the side that is right is the "right side". Furthermore, the direction of gravity perpendicular to the front-rear direction and the left-right direction is the up-down direction, and the upper side of the direction of gravity is the "upper side", and the lower side is the "lower side". Note that these directions are names used simply for explanation, and are not intended to limit the actual positional relationship and direction.

[0013] <1-1. Lower running body 200> The lower traveling structure 200 enables the hydraulic excavator 100 to travel. The lower traveling structure 200 has a pair of left and right crawlers 201 that are hydraulic motors, and a pair of left and right traveling motors 202. The left and right traveling motors 202 drive the left and right crawlers 201, respectively, enabling the hydraulic excavator 100 to move forward and backward, turn left and right, and so on.

[0014] <1-2. Upper rotating body 300> Next, the configuration of the upper rotating body 300 will be described with reference to Figs. 1 to 5. Fig. 2 is a cross-sectional view of the upper rotating body 300 seen from above. Fig. 3A is a cross-sectional view of the upper rotating body 300 seen from the right side with the bonnet 302 closed. Fig. 3B is a cross-sectional view of the upper rotating body 300 seen from the right side with the bonnet 302 open. Fig. 4A is a cross-sectional view of the upper rotating body 300 seen from the left side with the bonnet 302 closed. Fig. 4B is a cross-sectional view of the upper rotating body 300 seen from the left side with the bonnet 302 open. Fig. 5 is a perspective view of the upper rotating body 300 seen from an oblique front side with the bonnet 302 open. Note that Fig. 2 is a cross-sectional view of the bonnet 302 in a closed state and its interior (engine room) virtually cut along a plane perpendicular to the up-down direction along the dashed line II in Fig. 1. 3A and 3B are cross-sectional views of the bonnet 302 and the engine room, which are virtually cut along a plane parallel to the vertical direction along dashed line III-III in Fig. 2. Fig. 4A and 4B are cross-sectional views of the bonnet 302 and the engine room, which are virtually cut along a plane parallel to the vertical direction along dashed line IV-IV in Fig. 2.

[0015] The upper rotating body 300 is mounted on the upper part of the lower traveling body 200 and is capable of rotating. The upper rotating body 300 of the hydraulic excavator 100 has a machine frame 301, a bonnet 302, an engine 303, an air cleaner 304, a generator 305, a driver's seat 306, a work operation lever 307, a lever stand 308, and a traveling lever 309. The upper rotating body 300 of the hydraulic excavator 100 further has a biasing mechanism 1 and a connecting member 2. The biasing mechanism 1 and the connecting member 2 will be described later.

[0016] The machine frame 301 is disposed on the upper part of the lower running structure 200, and is capable of swinging relative to the lower running structure 200 via a swing bearing (not shown) by the driving force of a swing motor (not shown), which is a hydraulic motor.

[0017] As shown in Figs. 2 to 5, the bonnet 302 covers an engine 303, an air cleaner 304, a generator 305, and the like, which are installed on the aircraft frame 301. Also, as shown in Figs. 3A to 5, the bonnet 302 is rotatable around a first axis A1 together with a cockpit 306 and an operation lever 307, and the like. The first axis A1 extends in the left-right direction and passes through a connection portion between the aircraft frame 301 and the bonnet 302. For example, the bonnet 302 can be opened by rotating the bonnet 302 counterclockwise around the first axis A1 as viewed from the right side. The mechanism for opening the bonnet 302 will be described later.

[0018] The engine 303 is a prime mover that drives a plurality of hydraulic pumps. Each hydraulic pump supplies working oil to the traveling motor 202, the swing motor, the boom cylinder 4011, the arm cylinder 4021, the bucket cylinder 4031, and the like. An air cleaner 304 and a generator 305 are attached to the engine 303. The air cleaner 304 is a filtering device that removes impurities before the intake port of the engine 303. The air cleaner 304 is disposed rearward of the engine 303. The generator 305 generates electricity using the driving force of the engine 303 and supplies the electricity to electrical equipment mounted on the hydraulic excavator 100. The generator 305 is disposed rearward of the engine 303 and next to the air cleaner 304 in the left-right direction (on the left side in FIG. 2 ). The engine 303, the air cleaner 304, and the generator 305 are housed in an engine room inside the bonnet 302.

[0019] In addition, an operator's seat 306, a work operation lever 307, etc. are mounted on the bonnet 302. The operator's seat 306 is a seat where an operator can sit. Work operation levers 307 for operating a work implement 400 are arranged on the left and right sides of the operator's seat 306. The operator can drive the work implement 400 to perform work such as excavation by operating the work operation levers 307. A lever stand 308 is arranged in front of the operator's seat 306. A travel lever 309 is arranged on the lever stand 308. The operator can operate the travel lever 309 to travel and swing the hydraulic excavator 100, swing the upper swing body 300, etc.

[0020] <1-3. Work machine 400> Next, the configuration of the working machine 400 will be described with reference to Fig. 1. The working machine 400 is attached to the front of the upper rotating body 300 so as to be able to swing up and down. The working machine 400 is driven by power from an engine 303 and performs excavation work of earth and sand. The working machine 400 is equipped with a boom 401, an arm 402, and a bucket 403, which can be driven independently to perform excavation work.

[0021] The boom 401 has a base end supported by the front part of the upper rotating body 300, and is swung in a vertical plane by a boom cylinder 4011 which can move telescopically. The arm 402 has a base end supported by the tip part of the boom 401, and is swung in a vertical plane by an arm cylinder 4021 which can move telescopically. The bucket 403 has a base end supported by the tip part of the arm 402, and is swung in a vertical plane by a bucket cylinder 4031 which can move telescopically. Here, the boom cylinder 4011, the arm cylinder 4021, and the bucket cylinder 4031 are each a hydraulic actuator.

[0022] The bucket 403 is a container-shaped member that is attached to the tip of the work machine 400 and has claws for performing excavation work. The bucket 403 is attached so as to be able to swing via a pin 404 that is attached to the tip of the arm 402. Furthermore, the bucket 403 is connected to a bucket cylinder 4031 via a link mechanism 405.

[0023] <1-4. Mechanism for opening the bonnet 302> Next, a mechanism for opening the bonnet 302 of the hydraulic excavator 100 will be described with reference to Figs. 2 to 7. Fig. 6A is a schematic diagram of the urging mechanism 1 and the connecting member 2 when the bonnet 302 is closed. Fig. 6B is a schematic diagram of the urging mechanism 1 and the connecting member 2 when the bonnet 302 is open. Fig. 6C is a schematic diagram of the urging mechanism 1 and the connecting member 2 when the bonnet 302 is opened with a rotation amount θ equal to or greater than a threshold value θs. Fig. 7 is a graph showing an example of change in the urging force of the urging mechanism 1 according to the rotation amount θ when the bonnet 302 is opened. Figs. 6A to 6C show the urging mechanism 1 and the connecting member 2 as viewed from the left side.

[0024] The amount of rotation θ indicates the angle of rotation of the bonnet 302 in the counterclockwise direction around the first axis A1 as viewed from the right side, with the state in which the bonnet 302 is closed in FIG. 6A taken as the reference (i.e., θ=0). In other words, the amount of rotation θ is the angle of rotation of the bonnet 302 in the circumferential direction away from the aircraft frame 301 around the first axis A1. The threshold value θs is the amount of rotation θ at which the moment around the first axis A1 required to rotate (open) the bonnet 302 is 0 [N·mm]. For example, when the amount of rotation θ of the bonnet 302 reaches the threshold value θs, the center of gravity of the bonnet 302 (and the items mounted on the bonnet 302: for example, the cockpit 306 and the work operation lever 307) is located directly above the first axis A1. When the amount of rotation θ becomes larger than the threshold value θs, the center of gravity described above is located rearward of the first axis A1, so that the weight of the bonnet 302 and the items mounted on the bonnet 302 allows the bonnet 302 to be opened by its own weight.

[0025] As shown in FIGS. 6A to 6C, the rotation (ie, opening) of the bonnet 302 is assisted by a biasing mechanism 1 and a connecting member 2. As shown in FIG.

[0026] The biasing mechanism 1 is extendable and urges the bonnet 302 in a direction in which the bonnet 302 opens. For example, when the bonnet 302 is opened, the biasing mechanism 1 urges the bonnet 302 until the amount of rotation θ reaches a predetermined amount θe. Note that the predetermined amount θe is the amount of rotation θ of the bonnet 302 when the extension length of the biasing mechanism 1 reaches its upper limit. In this embodiment, the predetermined amount θe is less than a threshold value θs, and is preferably set to an amount of rotation θ close to the threshold value θs.

[0027] However, without being limited to the example of this embodiment, the predetermined amount θe may be equal to or greater than the threshold value θs. In this way, the biasing mechanism 1 can bias the bonnet 302 in the opening direction until the bonnet 302 (and items mounted on the bonnet 302) can open by its own weight. The biasing mechanism 1 can continue to assist in the opening of the bonnet 302.

[0028] In this embodiment, the biasing mechanism 1 is a gas spring, although this example does not exclude a configuration in which the biasing mechanism 1 is something other than a gas spring.

[0029] The connecting member 2 connects one end of the biasing mechanism 1 to the bonnet 302. The other end of the biasing mechanism 1 is connected to the vehicle frame 301 so as to be rotatable about a second axis A2. The second axis A2 extends in the left-right direction and passes through a connection portion between the other end of the biasing mechanism 1 and the vehicle frame 301. The distance between the first connecting portion C1 of the bonnet 302 and the connecting member 2 and the second connecting portion C2 of the biasing mechanism 1 and the connecting member 2 is variable in accordance with the rotation of the bonnet 302.

[0030] Moreover, the coupling member 2 has a fixing member 21 and a connecting member 22. The fixing member 21 is fixed to the inner surface of a top surface 3021 of the bonnet 302 and protrudes from the inner surface of the top surface 3021. A slit 211 is arranged in the fixing member 21. The slit 211 is an elongated hole that opens on both end surfaces in the left and right direction of the fixing member 21 and extends in the separating direction (in other words, the approaching direction). The separating direction is perpendicular to the left and right direction and is a direction away from the top surface 3021. The approaching direction is perpendicular to the left and right direction and is a direction approaching the top surface 3021.

[0031] The connecting member 22 connects one end of the biasing mechanism 1 to the fixed member 21 so as to be rotatable around a third axis A3. The third axis A3 extends in the left-right direction and passes through a connection portion (for example, a second connecting portion C2 described later) between one end of the biasing mechanism 1 and the fixed member 21. In this embodiment, the connecting member 22 includes a screw member such as a bolt and a nut screwed into the screw member. The screw member is inserted through a through hole and a slit 211 arranged at one end of the biasing mechanism 1, and is screwed into the nut with the biasing mechanism 1 and the fixed member 21 sandwiched therebetween. The screw member is movable in the direction in which the slit 211 extends (aparting direction or approaching direction). As a result, the connecting member 22 is guided by the slit 211 and is movable in the direction in which the slit 211 extends (aparting direction or approaching direction).

[0032] For example, when opening bonnet 302, if the amount of rotation θ from the closed state of bonnet 302 is less than a predetermined threshold value θs, a moment of a predetermined magnitude about first axis A1 is required to rotate (open) bonnet 302. At this time, biasing mechanism 1 extends until the amount of rotation θ reaches a predetermined amount θe, and connecting member 22 is positioned at the end of slit 211 on the top surface 3021 side, as shown in Figures 6A and 6B. As a result, the biasing force in the approaching direction due to the extension of biasing mechanism 1 is transmitted as is to fixing member 21. Therefore, bonnet 302 is biased in the opening direction by the extension of biasing mechanism 1.

[0033] Furthermore, when the rotation amount θ of the bonnet 302 becomes larger than a predetermined threshold value θs, the center of gravity is located rearward of the first axis A1. Therefore, the weight of the bonnet 302 (and the items mounted on the bonnet 302) causes the bonnet 302 to rotate in the opening direction without requiring a moment of a predetermined magnitude about the first axis A1. Therefore, a person opening the bonnet 302 can rotate the bonnet 302 without requiring a strong opening force or the biasing force of the biasing mechanism 1.

[0034] In this way, the biasing mechanism 1 biases the bonnet 302 in response to the rotation of the bonnet 302, so that the rotation of the bonnet 302 covering the engine 303 can be assisted with a compact and simple configuration.

[0035] When the rotation amount θ of the bonnet 302 reaches a predetermined amount θe, the extension length of the biasing mechanism 1 reaches its upper limit. On the other hand, when the rotation amount θ approaches the threshold value θs, the vertical component of the moment about the first axis A1 required to open the bonnet 302 becomes smaller. Therefore, even if the extension length of the biasing mechanism 1 reaches its upper limit before the bonnet 302 (and items mounted on the bonnet 302) are opened by their own weight (i.e., θe<θs), a person opening the bonnet 302 can open the bonnet 302 without needing a strong opening force.

[0036] Furthermore, when the amount of rotation θ of bonnet 302 reaches a predetermined amount θe, connecting member 22 moves in the separating direction according to the amount of rotation θ of bonnet 302 while being guided by slit 211, as shown in FIG. 6C.

[0037] In this way, the distance between the first connecting portion C1 and the second connecting portion C2 described above is variable in response to the rotation of the bonnet 302, and the connecting member 22 is guided by the slit 211 and can move in the separating direction. This allows the hydraulic excavator 100 to fully assist the rotation of the bonnet 302 with a compact structure and to rotate (open) the bonnet 302 to a greater extent, without increasing the size of the biasing mechanism 1.

[0038] In this embodiment, before the connection member 22 (the screw member of the connection member 22) reaches the end of the slit 211 in the separating direction, the rotation of the bonnet 302 is stopped by a stopper portion (not shown) that limits the amount of rotation θ. That is, at this time, the connection member 22 (the screw member of the connection member 22) that has been moving in the separating direction along the slit 211 stops moving. Also, the amount of rotation θ of the bonnet 302 becomes a maximum value θm. The stopper portion is, for example, a link member that connects the bonnet 302 and the machine frame 301. One end of the link member is connected to the bonnet 302, and the other end is connected to the machine frame 301. However, the example of this embodiment does not exclude a configuration in which the connection member 22 (the screw member of the connection member 22) comes into contact with the end of the slit 211 in the separating direction to stop the rotation of the bonnet 302.

[0039] Furthermore, when the rotation amount θ of the bonnet 302 is at its maximum, the distance between the first connecting portion C1 and the second connecting portion C2 is at its maximum. At this time, the distance between the first connecting portion C1 and the second shaft A2 can exceed the upper limit of the extension length of the biasing mechanism 1. Therefore, the bonnet 302 can be opened more widely, improving the workability of maintenance of the devices housed inside the bonnet 302.

[0040] Next, as shown in FIGS. 3A to 6C, the second axis A2 is preferably disposed between the engine 303 and the first axis A1 in the front-rear direction.

[0041] For example, a connection portion between the other end of the urging mechanism 1 and the aircraft frame 301 is disposed rearward of the engine 303. Therefore, the urging mechanism 1 can be disposed rearward of the engine 303, and the urging mechanism 1 can be rotated about the second axis A2 rearward of the engine 303 by extension.

[0042] In addition, the connection portion between the other end of the urging mechanism 1 and the vehicle frame 301 is disposed forward of the first axis A1. Therefore, it is not necessary to secure a space for the urging mechanism 1 to occupy next to the engine 303 in the left-right direction. Furthermore, by disposing the second axis A2 forward of the first axis A1, the urging mechanism 1 can be covered by the bonnet 302 when the bonnet 302 is closed. Furthermore, the other end of the urging mechanism 1 is not disposed rearward of the support axis of the bonnet 302 (i.e., the first axis A1). Therefore, the urging mechanism 1 can be disposed in a compact configuration, and the bonnet 302 can be prevented from becoming large (particularly in the front-rear direction).

[0043] However, this example does not exclude a configuration in which the second axis A2 is not disposed between the engine 303 and the first axis A1 in the front-rear direction. For example, the above example does not exclude a configuration in which the second axis A2 passes through the engine 303, and does not exclude a configuration in which a connection portion between the other end of the biasing mechanism 1 and the aircraft frame 301 is disposed on at least one of the left and right sides of the engine 303.

[0044] Also, preferably, as shown in FIG. 6A etc., when the bonnet 302 covers the engine 303, the biasing mechanism 1 is located between the engine 303 and the first axis A1 in the front-rear direction. That is, when the bonnet 302 is closed, the entire biasing mechanism 1 is located behind the engine 303 and ahead of the first axis A1. In this way, the other end of the biasing mechanism 1 is located behind the engine 303 regardless of whether the bonnet 302 is open or closed. Therefore, the space occupied by the biasing mechanism 1 only needs to be secured behind the engine 303. Therefore, the biasing mechanism 1 can be arranged in a compact configuration, and the size of the bonnet 302 can be prevented from increasing. However, this example does not exclude a configuration in which at least a part of the biasing mechanism 1 is not located between the engine 303 and the first axis A1 in the front-rear direction when the bonnet 302 is closed.

[0045] Preferably, as shown in Figs. 6A to 6C, the second axis A2 is disposed below the air cleaner 304. That is, the other end of the urging mechanism 1 is rotatably connected to the vehicle frame 301 below the air cleaner 304 when viewed in the left-right direction. This can prevent a part of the urging mechanism 1 from being located next to the air cleaner 304 in the left-right direction when the bonnet 302 is open. This can improve the workability of the maintenance of the air cleaner 304. However, this example does not exclude a configuration in which the second axis A2 is not disposed below the air cleaner 304.

[0046] As shown in FIG. 2, the biasing mechanism 1 is preferably disposed between the air cleaner 304 and the generator 305 in the left-right direction. For example, when the bonnet 302 covers the engine 303, the biasing mechanism 1 is disposed between the air cleaner 304 and the generator 305. When the bonnet 302 is rotated, the biasing mechanism 1 may or may not be disposed between the air cleaner 304 and the generator 305. In this way, the biasing mechanism 1 can be disposed compactly by effectively utilizing the gap between the air cleaner 304 and the generator 305. In addition, since the biasing mechanism 1 can be disposed on the left-right central side of the bonnet 302, a biasing force can be applied to the left-right central side of the bonnet 302. Therefore, even if there is only one biasing mechanism 1, the rotation of the bonnet 302 can be smoothly assisted. However, this example does not exclude a configuration in which the biasing mechanism 1 is not disposed between the air cleaner 304 and the generator 305 in the left-right direction. For example, the biasing mechanism 1 may be disposed on at least one of the left side and the right side of the bonnet 302.

[0047] 6A and other figures, when the bonnet 302 covers the engine 303 and other components (i.e., when the bonnet 302 is closed), the biasing mechanism 1 extends forward as it moves upward from the second axis A2. Alternatively, in the above-mentioned state, the biasing mechanism 1 may extend upward from the second axis A2. In other words, when the bonnet 302 is closed, the connecting member 2 is disposed forward of or directly above the second axis A2.

[0048] This makes it possible to increase the length over which the urging mechanism 1 can extend and retract. Therefore, the urging mechanism 1 can assist the rotation of the bonnet 302 over a wide range of rotation of the bonnet 302.

[0049] Furthermore, compared to a configuration in which the biasing mechanism 1 extends rearward as it moves upward from the second axis A2 when the bonnet 302 is closed, the connecting member 2 can connect one end of the biasing mechanism 1 to the bonnet 302 at a position further forward. Therefore, the distance between this connecting portion and the first axis A1 can be made wider, so that the biasing force of the biasing mechanism 1 acts more effectively on the bonnet 302 based on the principle of leverage. This enhances the effect of the biasing mechanism 1 in assisting the opening of the bonnet 302.

[0050] However, the above example does not exclude a configuration in which the biasing mechanism 1 extends rearward as it moves upward from the second axis A2 in a state in which the bonnet 302 covers the engine 303 and the like.

[0051] <3.Notes> The above describes the embodiments of the present invention. Note that the above embodiments are merely examples, and it will be understood by those skilled in the art that various modifications are possible in the combination of each component and each process, and that such modifications are within the scope of the present invention.

[0052] <4. Summary> The embodiments described thus far will be summarized below.

[0053] For example, the work machine 100 disclosed herein may include: A work machine 100 in which a bonnet 302 covering a prime mover 303 mounted on a machine frame 301 is rotatable about a first axis A1 extending in the left-right direction, an expandable biasing mechanism 1 that biases the bonnet 302 in response to rotation of the bonnet 302; A connecting member 2 that connects one end of the biasing mechanism 1 to the bonnet 302; Equipped with The other end of the biasing mechanism 1 is rotatably connected to the machine body frame 301 around a second axis A2 extending in the left-right direction, The distance between the first connecting portion C1 of the bonnet 302 and the connecting member 2 and the second connecting portion C2 of the biasing mechanism 1 and the connecting member 2 is configured to be variable in response to the rotation of the bonnet 302 (first configuration).

[0054] The work machine 100 having the first configuration described above has In the front-rear direction, the second shaft A2 may be configured (second configuration) to be disposed between the prime mover 303 and the first shaft A1.

[0055] Moreover, the work machine 100 having the first or second configuration described above has The interval may be configured to be maximum when the amount of rotation of the bonnet 302 in the circumferential direction about the first axis A1 in the direction away from the vehicle frame 301 becomes maximum (third configuration).

[0056] Moreover, the work machine 100 having any of the first to third configurations described above has In a state in which the bonnet 302 covers the prime mover 303, the biasing mechanism 1 may be configured to be located between the prime mover 303 and the first shaft A1 in the front-rear direction (fourth configuration).

[0057] Moreover, the work machine 100 having any of the first to fourth configurations described above has The second axis A2 may be arranged forward of the first axis A1 (fifth configuration).

[0058] Moreover, the work machine 100 having any of the first to fifth configurations described above has The engine 303 further includes an air cleaner 304 for removing impurities before the intake port of the engine 303. The second axis A2 may be configured to be disposed below the air cleaner 304 (sixth configuration).

[0059] Moreover, the work machine 100 having any of the first to sixth configurations described above has an air cleaner 304 for removing impurities before the intake port of the engine 303; A generator 305 disposed behind the prime mover 303 and adjacent to the air cleaner 304 in the left-right direction; Further equipped with In a state in which the bonnet 302 covers the prime mover 303, the biasing mechanism 1 may be configured to be disposed between the air cleaner 304 and the generator 305 (seventh configuration).

[0060] Moreover, the work machine 100 having any of the first to seventh configurations described above has When the bonnet 302 covers the prime mover 303, the biasing mechanism 1 may be configured to extend forward as it extends upward from the second axis A2, or may be configured to extend upward from the second axis A2 (8th configuration).

[0061] Moreover, the work machine 100 having any of the first to eighth configurations described above has The connecting member 2 is A fixing member 21 fixed to the bonnet 302; a connecting member 22 that connects one end of the biasing mechanism 1 to the fixed member 21 so as to be rotatable about a third axis A3 extending in the left-right direction; having The fixing member 21 has a slit 211 that is perpendicular to the left-right direction and extends in a direction away from the bonnet 302. The connection member 22 may be configured to be guided by the slit 211 and movable in the separating direction (ninth configuration). [Explanation of symbols]

[0062] 100 Hydraulic Excavator 301 Aircraft Frame 302 Bonnet 303 Engine 304 Air cleaner 1 Biasing mechanism 2 Connecting members 21 Fixing member 211 Slit 22 Connection member 305 Generator A1 First axis A2 2nd axis A3 3rd axis C1 1st connection part C2 2nd connection part θ Rotation amount θs threshold

Claims

1. A work machine having a bonnet that covers a prime mover attached to a machine body frame and that is rotatable about a first axis that extends in the left-right direction, a retractable biasing mechanism that biases the bonnet in response to rotation of the bonnet; a connecting member that connects one end of the biasing mechanism to the bonnet; Equipped with the other end of the biasing mechanism is rotatably connected to the vehicle body frame about a second axis extending in the left-right direction, A working machine, wherein a distance between a first connecting portion of the bonnet and the connecting member and a second connecting portion of the biasing mechanism and the connecting member is variable in response to rotation of the bonnet.

2. The work machine according to claim 1 , wherein the second shaft is disposed between the prime mover and the first shaft in the front-rear direction.

3. The work machine according to claim 1 , wherein the interval is maximum when an amount of rotation of the bonnet in a circumferential direction about the first axis and away from the machine body frame is maximum.

4. The work machine according to claim 1 , wherein the biasing mechanism is located between the prime mover and the first shaft in the front-rear direction when the bonnet is covering the prime mover.

5. The work machine according to claim 1 , wherein the second shaft is disposed forward of the first shaft.

6. An air cleaner is further provided to remove impurities before the intake port of the engine, The work machine according to claim 1 , wherein the second shaft is disposed below the air cleaner.

7. an air cleaner for removing impurities before the intake of the engine; a generator disposed behind the prime mover and adjacent to the air cleaner in the left-right direction; Further equipped with 2. The work machine according to claim 1, wherein the biasing mechanism is disposed between the air cleaner and the generator when the hood is covering the prime mover.

8. The work machine according to claim 1 , wherein, in a state in which the bonnet covers the prime mover, the biasing mechanism extends forward as it extends upward from the second shaft, or extends upward from the second shaft.

9. The connecting member is A fixing member fixed to the bonnet; a connecting member that connects one end of the biasing mechanism to the fixed member so as to be rotatable about a third axis extending in the left-right direction; having The fixing member has a slit that is perpendicular to the left-right direction and extends in a direction away from the bonnet, The work machine according to claim 1 , wherein the connecting member is guided by the slit and is movable in the separating direction.

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