Work machine

Abstract

To provide a work machine capable of unlocking and opening an operation room door by remote operation.SOLUTION: The work machine comprises a main body frame constituting a main body, an operation room 3 provided on a rear frame which is the rear part of the main body frame and in which a rotatable door 34 is installed in an entrance / exit, a lock device that locks the door 34, a door catch that holds the door 34 in a state in which locking by the lock device is released, and a remote operation switch 4 that outputs an operation signal for remotely opening the door 34, and the work machine has an inner plate 53 provided in the door 34, which rotates by the operation signal output from the remote operation switch 4 to release locking of the door 34 by the lock device and to release holding of the door 34 by the door catch.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a work machine equipped with a driver's cab provided with a door that can be opened and closed by remote control. [Background technology]

[0002] Unlike ordinary passenger vehicles, the cabs of work machines such as wheel loaders and hydraulic excavators are often located high above the ground. When the operator cannot access the cab door from the ground, he or she must climb onto the deck in front of the cab to open and close the door. However, there are cases where there is not enough space on the deck.

[0003] In view of this situation, for example, Patent Document 1 discloses a work machine in which, when a remote control switch is operated on a door that has been unlocked by a locking device, an electric motor is energized and the door is opened or closed by the rotational torque of the electric motor, and the door can be opened or closed when an inertial force is applied while the remote control switch is not operated. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2023-114194 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the door opening and closing technology described in Patent Document 1 is based on the premise that the door has been unlocked in advance by a locking device, so even when opening the door remotely from the ground, the operator must go to the door to unlock it, which is time-consuming. Also, the operator must move away from the unlocked door to perform the remote operation, which is undesirable from a security standpoint.

[0006] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a work machine in which the door of the operator's cab can be remotely controlled to be unlocked and opened. [Means for solving the problem]

[0007] In order to achieve the above object, the present invention provides a work machine comprising a main body frame that constitutes a main body, a driver's cab provided on the main body frame and having a pivotable door attached to an entrance or exit, a locking device that locks the door, a door catch that holds the door in a state where it has been unlocked by the locking device, and a remote control device that outputs an operation signal to remotely open the door, the work machine being characterized in that it has a pivoting member that is provided on the door and rotates in response to the operation signal output from the remote control device to unlock the door by the locking device and release the hold of the door by the door catch. [Effects of the Invention]

[0008] According to the present invention, the door of the driver's cab can be locked and opened by remote control. Problems, configurations, and effects other than those described above will become apparent from the following description of the embodiment. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is an external side view showing an example of the configuration of a wheel loader according to an embodiment of the present invention. [Figure 2] FIG. 2 is an enlarged perspective view of the exterior of the door-side peripheral portion of the driver's cab. [Figure 3] FIG. 10 is a top view showing the door opening and closing operation. [Figure 4] FIG. 4 is a side view showing the opening and closing operation of the door. [Figure 5] FIG. 2 is a front view showing the appearance of the remote control box. [Figure 6] FIG. 2 is a diagram showing the inside of the remote control box. [Figure 7] FIG. 2 is a front view showing the door opening device housed in the cover. [Figure 8] FIG. 2 is a view of the door opening device as seen from inside the driver's cab. [Figure 9] FIG. 2 is a view of the door opening device as seen from outside the driver's cab. [Figure 10] FIG. 2 is a perspective view showing the positional relationship between an inner plate and an outer plate. [Figure 11] FIG. 4 is a side view showing the positional relationship between an inner plate and an outer plate. [Figure 12] FIG. 10 is a diagram showing the state of the inner plate when the door is locked. [Figure 13] FIG. 10 is a diagram showing the state of the inner plate when the door is unlocked. [Figure 14] 10 is a view showing the state of the inner plate when the door is released from the door catch; FIG. [Figure 15] FIG. 10 is a perspective view showing the lock spring-up member when the door is locked. [Figure 16] FIG. 10 is a perspective view showing the lock spring-up member when the door is unlocked. [Figure 17] FIG. 10 is a front view showing the lock spring-up member when the door is locked. [Figure 18] FIG. 10 is a front view showing the lock spring-up member when the door is unlocked. [Figure 19] 10A and 10B are diagrams showing the state of the outer plate when the door is held by the door catch; [Figure 20] 10A and 10B are diagrams illustrating the state of the outer plate when the door is released from the door catch. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, a wheel loader that performs loading and unloading work will be described as one aspect of a work machine according to an embodiment of the present invention.

[0011] <Wheel Loader 1 Configuration> First, the configuration of the wheel loader 1 will be described with reference to FIGS.

[0012] Fig. 1 is an exterior side view showing one configuration example of a wheel loader 1 according to an embodiment of the present invention. Fig. 2 is an exterior perspective view showing an enlarged view of the periphery of the door 34 side of the driver's cab 3. Fig. 3 is a top view showing the opening and closing operation of the door 34. Fig. 4 is a side view showing the opening and closing operation of the door 34.

[0013] The wheel loader 1 is an articulated work machine whose vehicle body (main body) is steered by bending in the center. A front frame 1A constituting the front part of the vehicle body frame (main body frame) and a rear frame 1B constituting the rear part of the vehicle body frame (main body frame) are connected by a center joint 10 so as to be freely rotatable in the left-right direction, and steering operation causes the front frame 1A to bend in the left-right direction relative to the rear frame 1B.

[0014] The vehicle body is provided with four wheels 11, two of which are front wheels 11A and are provided on both the left and right sides of the front frame 1A, and the remaining two are rear wheels 11B and are provided on both the left and right sides of the rear frame 1B. Of the four wheels 11, only the left front wheel 11A and rear wheel 11B are shown in Fig. 1. A hydraulically driven working device 2 is attached to the front of the front frame 1A.

[0015] The working device 2 has a lift arm 21 attached to the front frame 1A so as to be rotatable in the vertical direction, two lift arm cylinders (not shown) that drive the lift arm 21, a bucket 22 attached to the tip of the lift arm 21 so as to be rotatable in the vertical direction, a bucket cylinder 23 that drives the bucket 22, and a bell crank 24 rotatably connected to the lift arm 21 and that forms a link mechanism between the bucket 22 and the bucket cylinder 23.

[0016] The rear frame 1B is provided with a cab 3 in which an operator sits, a machine room 12 that houses various devices required for driving the wheel loader 1, and a counterweight 13 that maintains balance with the work implement 2 to prevent the vehicle body from tilting. On the rear frame 1B, the cab 3 is located at the front, the counterweight 13 at the rear, and the machine room 12 between the cab 3 and the counterweight 13.

[0017] The cab 3 includes a floor panel (not shown) attached to the rear frame 1B, a ceiling 31 covering the upper part of the floor panel, a plurality of pillars 32 extending in the vertical direction between the floor panel and the ceiling 31, a plurality of windows 33 attached between the plurality of pillars 32, and a door 34 provided at one of the left and right entrances 3A (see Figures 2 and 3) that can be opened and closed. A driver's seat where an operator sits is provided in the center of the cab 3.

[0018] In this embodiment, four pillars 32 are erected in the driver's cab 3. Of the four pillars 32, two are arranged as a pair of front pillars 32A on both the left and right sides in front of the driver's seat, and the remaining two are arranged as a pair of rear pillars 32B on both the left and right sides behind the driver's seat. Note that, of the four pillars 32, only the front pillar 32A and rear pillar 32B arranged on the left side are shown in Figs. 1, 2, and 4.

[0019] The multiple windows 33 include a front window 33A that protrudes forward of the cab 3 between a pair of front pillars 32A, and a rear window 33B that protrudes rearward of the cab 3 between a pair of rear pillars 32B. The entrance / exit 3A is provided between the front pillar 32A and the rear pillar 32B, which are located on the left side, i.e., on the left side of the cab 3.

[0020] At least an area above the center of the door 34 is formed as a window, and the door 34 is attached to the front pillar 32A located on the left side via a pair of hinges 36 (see FIG. 2). As shown in FIGS. 3 and 4, the door 34 rotates horizontally around the pair of hinges 36, opening from the rear side toward the front side and closing from the front side toward the rear side. In other words, the door 34 according to this embodiment is a front-opening door.

[0021] In this embodiment, the entrance / exit 3A and the door 34 are provided on the left side of the cab 3, but depending on the specifications of the vehicle body, they may be provided on the right side or on both the left and right sides. The door 34 can be opened and closed directly by manual operation by an operator, or can be opened and closed by remote control.

[0022] As shown in Figures 2 to 4, a deck 1C extending outward (leftward) from the rear frame 1B is provided below the door 34 on the left side of the cab 3. A step 14 having a plurality of treads 140 arranged at predetermined intervals in the vertical direction is provided below the deck 1C. The operator uses the deck 1C and the step 14 when getting into or leaving the cab 3.

[0023] 2, handrails 100 are erected on the front and rear sides of deck 1C. In particular, the front handrail 100 serves as a stopper to prevent door 34 from opening too far.

[0024] <Opening drive mechanism for door 34> Next, the opening drive mechanism of the door 34 will be described with reference to FIGS.

[0025] 5 is a front view showing the appearance of the remote control box 40. FIG. 6 is a view showing the inside of the remote control box 40.

[0026] When an operator wishes to remotely open the door 34, he or she operates a remote control switch 4 as a remote control device. When the operator operates the remote control switch 4, the remote control switch 4 outputs an operation signal for opening the door 34. In this embodiment, the remote control switch 4 is housed in a lockable remote control box 40, as shown in FIG. 6.

[0027] As shown in Figures 5 and 6, the remote control box 40 has a box-shaped main body 401 with an opening 401A formed on one side, and a door 402 attached to the main body 401 in a position that covers the opening 401A and that can be opened and closed via a pair of hinges 400A.

[0028] A key cylinder 402A for locking the door 402 is attached. Therefore, the remote control box 40 cannot be opened unless the key cylinder 402A is unlocked, and therefore the operators who can operate the remote control switch 4 are limited to those who have a key that matches the key cylinder 402A. This key is the same as the keys for the main devices that make up the wheel loader 1, such as the engine key.

[0029] The remote control box 40 is disposed in a space formed below the deck 1C, with the door 402 (opening 401A) facing the front of the vehicle body, below the movable range of the door 34 (see FIGS. 2 and 4). This allows the operator to access the remote control switch 4 in the remote control box 40 while standing on the ground in a comfortable and stable posture and without colliding with the open door 34.

[0030] Fig. 7 is a front view showing the door opening device 5 housed in the cover 50. Fig. 8 is a view of the door opening device 5 as seen from inside the cab 3. Fig. 9 is a view of the door opening device 5 as seen from outside the cab 3. Fig. 10 is a perspective view showing the positional relationship between the inner plate 53 and the outer plate 57. Fig. 11 is a side view showing the positional relationship between the inner plate 53 and the outer plate 57.

[0031] 7, the door opening device 5 is housed in a cover 50 (shown by a two-dot chain line) and is provided on the side of the door 34 facing the inside of the cab 3. In this way, the door opening device 5 is designed to be compact, and there is no need to reserve a large space for installing the door opening device 5, so the space inside the cab 3 is not constricted, and the cab 3 is more comfortable to live in.

[0032] The door opening device 5 includes a door opening / closing mechanism part 51 that forms the main body of the opening / closing mechanism of the door 34, an actuator 52 as a drive device that is driven based on an operation signal output from the remote control switch 4, an inner plate 53 as a rotating member that rotates when driven by the actuator 52, an inside lock switch 59 that is provided inside the cab 3 and moves up and down between a lower position that locks the door 34 and an upper position that unlocks the door 34, so that the door 34 can be manually locked or unlocked, a lock flip-up member 54 as an unlocking member that raises the inside lock switch 59 of the door 34 to the upper position to unlock it, and an inner handle 55 as an inside operating device for manually opening the door 34 from inside the cab 3.

[0033] The door opening device 5 also includes a key cylinder 56A (see Figure 9) that is provided outside the cab 3 and rotates with a key to manually lock or unlock the door 34, an outer handle 56 as an external operating device for manually opening the door 34 from outside the cab 3, an outer plate 57 as an external rotating member that rotates when the outer handle 56 is operated, and a gas spring 58 that opens the door 34.

[0034] The door opening / closing mechanism 51 is a general-purpose product and includes a locking device that rotates to lock the door 34 when the inside lock switch 59 is operated to the lower position or the key cylinder 56A is operated to the lock position, and a rotatable door catch that holds the door 34 in a state where it is unlocked by the locking device. The door opening / closing mechanism 51 is disposed rearward of the inner plate 53.

[0035] In addition, the locking device of the door opening / closing mechanism 51 is provided with a lock plate 511, and when this lock plate 511 is flipped up by the lock flip-up member 54, the door 34 is unlocked, the key cylinder 56A rotates to the unlocked position, and the inside lock switch 59 moves to the upper position.

[0036] Furthermore, a release plate 512 is provided on the door catch of the door opening / closing mechanism 51, and is connected to the inner plate 53 via a first link 61. As shown in FIG. 10 in particular, one end of the first link 61 is pin-connected to the lower end of the release plate 512, and the other end is engaged with a first elongated hole 531 formed in the inner plate 53.

[0037] As the inner plate 53 rotates, the lower end of the release plate 512, which is the connecting portion with the first link 61, is pulled upward. This releases the door 34 from being held by the door catch. The door 34, which has been released from being held by the door catch, is opened by the expansion of the gas spring 58.

[0038] The inner plate 53 is connected to the actuator 52 via a second link 62. The actuator 52 is disposed diagonally above and forward of the inner plate 53. When the actuator 52 is driven, the second link 62 is pulled toward the actuator 52 (diagonally above and forward). This causes the inner plate 53 to rotate toward the front, that is, clockwise when viewed from inside the cab 3 (counterclockwise when viewed from outside the cab 3).

[0039] The lock spring-up member 54 is formed to protrude in a direction intersecting with the lock plate 511, and is fixed by two bolts to the lower side of the inner plate 53 (the side opposite to the connection part with the second link 62). The lock spring-up member 54 moves in conjunction with the rotation of the inner plate 53, and collides with the lock plate 511 when the inner plate 53 rotates to a predetermined position. This causes the lock plate 511 to spring up, and the door 34 is unlocked.

[0040] The inner handle 55 is disposed in front of the inner plate 53 and is connected to the inner plate 53 via a third link 63. The third link 63 is one type of connecting member that connects the inner handle 55 and the inner plate 53, and has one end fixed to the inner handle 55 and the other end engaged with a second elongated hole 532 formed in the inner plate 53 (see FIG. 10 in particular).

[0041] When the operator pulls the inner handle 55, the third link 63 is pulled toward the inner handle 55 (front side). Accordingly, the inner plate 53 rotates toward the front side, that is, clockwise when viewed from inside the cab 3 (counterclockwise when viewed from outside the cab 3). Therefore, the inner plate 53 rotates not only when the actuator 52 is driven, but also when the inner handle 55 is operated. This allows the operator to open the door 34 both by remote control and manually from inside the cab 3.

[0042] The outer handle 56 is disposed on the outside of the door 34 in a position overlapping the inner plate 53, and is connected to the outer plate 57. The outer plate 57 is located between the outer handle 56 and the inner plate 53. As shown in FIG. 10, an elongated hole 570 is formed in the outer plate 57, and a first link 61 is engaged with this elongated hole 570. In other words, the first link 61 is connected to both the inner plate 53 and the outer plate 57. As shown in FIG. 11, the inner plate 53 and the outer plate 57 are rotatably connected to each other by a bolt.

[0043] When the operator pulls the outer plate 57, the outer plate 57 rotates toward the front, that is, counterclockwise when viewed from outside the cab 3 (clockwise when viewed from inside the cab 3). Then, the release plate 512 connected to one end of the first link 61 is pulled, and the door 34 is released from the door catch.

[0044] Therefore, the release plate 512 is pulled not only by the rotation of the inner plate 53 but also by the rotation of the outer plate 57. This allows the operator to open the door 34 by remote control, manual operation from inside the cab 3, or manual operation from outside the cab 3.

[0045] The lock spring-up member 54 is not connected to the outer plate 57. Therefore, even if the outer plate 57 rotates, the door 34 is not unlocked. In other words, when the door 34 is locked, the release plate 512 is not pulled, so the door catch does not release the door 34, and the door 34 does not open. Therefore, when manually opening the door 34 from outside the cab 3, for example, the key cylinder 56A is operated with a key or the like to unlock the door, and then the outer handle 56 is operated.

[0046] <Door 34 opening operation> Next, the opening operation of the door 34 will be described with reference to FIGS.

[0047] First, with reference to Figs. 12 to 18, the manner in which the door 34 opens when the operator operates it remotely or manually from inside the cab 3 will be described.

[0048] Fig. 12 is a diagram showing the state of the inner plate 53 when the door 34 is locked. Fig. 13 is a diagram showing the state of the inner plate 53 when the door 34 is unlocked. Fig. 14 is a diagram showing the state of the inner plate 53 when the door 34 is released from the hold of the door 34 by the door catch. Fig. 15 is a perspective view showing the state of the lock spring-up member 54 when the door 34 is locked. Fig. 16 is a perspective view showing the state of the lock spring-up member 54 when the door 34 is unlocked. Fig. 17 is a front view showing the state of the lock spring-up member 54 when the door 34 is locked. Fig. 18 is a front view showing the state of the lock spring-up member 54 when the door 34 is unlocked.

[0049] When the door 34 is to be opened by remote control, the operator accesses the remote control box 40 and presses the remote control switch 4. When the operator presses the remote control switch 4, the remote control switch 4 outputs an operation signal to the actuator 52.

[0050] The actuator 52 is driven based on an operation signal output from the remote control switch 4, and rotates the inner plate 53 via the second link 62. When the inner plate 53 rotates to a predetermined position (from the state in FIG. 12 to the state in FIG. 13), the lock flip-up member 54 collides with the lock plate 511 and flips up the lock plate 511 (from the state in FIG. 15 to the state in FIG. 16 and from the state in FIG. 17 to the state in FIG. 18). This releases the lock on the door 34.

[0051] The actuator 52 continues to operate even after the door 34 is unlocked, causing the inner plate 53 to further rotate from the predetermined position. As shown in FIG. 14, the inner plate 53, which continues to rotate, pulls the release plate 512 via the first link 61. This releases the door 34 from the door catch, causing the door 34 to open.

[0052] In this way, the door 34 can be unlocked (unlocked) and opened (released from the state held by the door catch) by remote control, so the operator does not need to go directly to the door 34 to unlock it.

[0053] Furthermore, when manually opening the door 34 from inside the cab 3, the operator pulls the inner handle 55 toward himself. When the inner handle 55 is pulled, the third link 63 is pulled forward, causing the inner plate 53 to rotate. The process from this point onward is the same as in the case of remote operation.

[0054] When the inner plate 53 rotates to a predetermined position (from the state in FIG. 12 to the state in FIG. 13), the lock spring-up member 54 collides with the lock plate 511 and springs up the lock plate 511 (from the state in FIG. 15 to the state in FIG. 16 and from the state in FIG. 17 to the state in FIG. 18). This releases the lock on the door 34.

[0055] Next, the inner plate 53 further rotates from the predetermined position and pulls the release plate 512 via the first link 61, as shown in Figure 14. This releases the door 34 from the door catch, allowing the door 34 to open.

[0056] Next, with reference to FIGS. 19 and 20, the manner in which the door 34 opens when manually operated by an operator from outside the cab 3 will be described.

[0057] Fig. 19 is a diagram showing the state of the outer plate 57 when the door 34 is held by the door catch, and Fig. 20 is a diagram showing the state of the outer plate 57 when the door 34 is released from the door catch.

[0058] When manually opening the door 34 from outside the cab 3, the operator unlocks the door 34 using a key. Next, the operator pulls the outer handle 56 toward himself. When the outer handle 56 is pulled, the outer plate 57 rotates. The outer plate 57 pulls the release plate 512 via the first link 61 (from the state in FIG. 19 to the state in FIG. 20). This releases the door 34 from the door catch, and the door 34 opens.

[0059] In this way, when opening the door 34 from outside the driver's cab 3, it is necessary to unlock it using a key, so only those who have the key can open the door 34 from outside the driver's cab 3.

[0060] The above describes an embodiment of the present invention. However, the present invention is not limited to the above embodiment and includes various modifications. For example, the above embodiment has been described in detail to clearly explain the present invention, and is not necessarily limited to an embodiment including all of the described configurations. Furthermore, it is possible to replace part of the configuration of this embodiment with the configuration of another embodiment, or to add the configuration of another embodiment to the configuration of this embodiment. Furthermore, it is possible to add, delete, or replace part of the configuration of this embodiment with other configurations.

[0061] For example, in the above embodiment, the wheel loader 1 has been described as an example of one type of work machine, but the present invention is not limited to this, and other types of work machines may also be used, for example, hydraulic excavators. [Explanation of symbols]

[0062] 1: Wheel loader (work machine) 1B: Rear frame (main frame) 1C: Deck 3: Driver's cab 4: Remote control switch (remote control device) 34: Door 52: Actuator (drive device) 53: Inner plate (rotating member) 54: Lock flip-up member (lock release member) 55: Inner handle (inner operating device) 56: Outer handle (outer operating device) 57: Outer plate (outer rotating member) 63: Third link (connecting member)

Claims

1. a main body frame constituting the main body; a driver's cab provided on the main body frame and having a pivotable door attached to an entrance / exit; a locking device for locking the door; a door catch for holding the door in a state in which the door is unlocked by the locking device; a remote control device that outputs an operation signal for remotely opening the door; In a work machine equipped with a rotating member provided on the door, which rotates in response to the operation signal output from the remote control device to unlock the door by the locking device and release the door from the door catch; A work machine characterized by:

2. 2. The work machine according to claim 1, The rotating member is The door is unlocked by the locking device when rotated to a predetermined position, and is released from the door catch when rotated further from the predetermined position. A work machine characterized by:

3. 2. The work machine according to claim 1, an unlocking member connected to the rotating member for unlocking the door by the locking device; The locking device, the door catch, the rotating member, and the lock release member are all provided on the side of the door facing the inside of the driver's cab. A work machine characterized by:

4. 2. The work machine according to claim 1, an inside operation device provided on a side of the door facing the inside of the cab for manually operating and opening the door from inside the cab; a connecting member that connects the inner operating device and the rotating member; and The rotating member is When the inner operating device is operated, it rotates via the connecting member. A work machine characterized by:

5. 2. The work machine according to claim 1, an outside operation device provided on a side of the door facing the outside of the cab for manually operating and opening the door from outside the cab; an outer rotation member that rotates when the outer operation device is operated to release the door from the door catch; Further having A work machine characterized by:

6. 2. The work machine according to claim 1, A deck extending outward from the main body frame is provided on the side of the door of the driver's cab, The remote control device is Located below the door's range of motion and below the deck A work machine characterized by:

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