JP2020020239A - Operator cab of work vehicle - Google Patents

Abstract

To provide an operator cab of a work vehicle capable of easily closing a door of an operator cab at low cost.SOLUTION: An operator cab 8 of a work vehicle includes: an operator cab 11 formed with an entrance 21 and a ventilator 22; a door 12 opening/closing the entrance 21; a lid 13 opening/closing the ventilator 22; a link mechanism 14 connecting the door 12 and the lid part 13 so that the lid part 13 is opened when the door 12 is opened and the lid part 13 is closed when the door 12 is closed; and a blocking timing adjustment part 15 which stops a closing operation of the lid part 13 in a first step of the operation of closing the door 12, and performs the closing operation of the lid part 13 in a second step of the operation of closing the door 12 after the first step.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a driver's cab of a work vehicle.

  A driver's cab of a work vehicle such as a dump truck operating at a mine site or a civil engineering site is required to have high airtightness in order to prevent entry of dust from the outside and to maintain a room temperature adjusted by an air conditioner or the like. Patent Literature 1 discloses a configuration in which a ventilation opening formed in a cab is opened when an opening operation of a door is detected, and a ventilation opening is operated when a closing operation of the door is detected. ing. With this configuration, when the door of the cab is closed, the air in the cab flows out through the ventilation port to suppress an instantaneous increase in the air pressure in the cab. Thus, the cab door can be closed with a small force.

JP-A-2004-142667

  In the configuration of Patent Literature 1, it is necessary to use electric means such as a sensor and a solenoid in order to detect the opening / closing operation of the door and open / close the ventilation port. However, the working vehicle operates at a site where there is a lot of dust, and the vehicle vibrates during operation. For this reason, the electric means is required to operate reliably in a severe environment. Therefore, it is necessary to take measures against the durability of the electric means, and there is a problem that the manufacturing cost of the cab is increased.

  The present invention has been made in view of such a problem, and it is possible to easily close a driver's cab door at low cost and to maintain a closed cab of a driver's cab. The purpose is to provide.

  A driver's cab of a work vehicle according to one aspect of the present invention includes a driver's cab main body having an entrance and a ventilation opening, a door for opening and closing the entrance, a lid for opening and closing the ventilation opening, and opening the door. In order to open the lid, and so as to close the lid when closing the door, a link mechanism connecting the door and the lid, the first step of closing the door, A closing timing adjusting unit that stops the closing operation of the lid and performs the closing operation of the lid in a second stage of the operation of closing the door after the first stage.

  ADVANTAGE OF THE INVENTION According to this invention, while closing the door of a cab easily at low cost, the airtightness of a cab can be maintained.

It is a side view showing a dump truck provided with a cab concerning one embodiment of the present invention. It is a plane sectional view showing an important section of a cab concerning one embodiment of the present invention. FIG. 3 is a sectional view taken along line III-III of FIG. 2. FIG. 4 is a sectional view taken along line IV-IV of FIG. 2. FIG. 3 is a perspective view showing a closing timing mechanism provided in a cab. FIG. 6 is a schematic diagram showing a process of an operation of closing a door in the configuration shown in FIGS. FIG. 6 is a schematic diagram showing a process of an operation of closing a door in the configuration shown in FIGS. FIG. 6 is a schematic diagram showing a process of an operation of closing a door in the configuration shown in FIGS. FIG. 6 is a schematic diagram showing a process of opening a door in the configuration shown in FIGS. FIG. 6 is a schematic diagram showing a process of opening a door in the configuration shown in FIGS. FIG. 6 is a schematic diagram showing a process of opening a door in the configuration shown in FIGS.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. The operator cab according to the present embodiment is provided in a dump truck 1 illustrated in FIG. First, the dump truck 1 will be described.

<Dump truck>
As shown in FIG. 1, the dump truck 1 is a work vehicle, and is an articulated type dump truck in which a front frame 2 and a rear frame 3 are swingably connected about an axis O.
The rear frame 3 is provided with a rear wheel 4 and a vessel 5. The vessel 5 is provided so as to be able to move up and down with respect to the rear frame 3. The vessel 5 is driven by a hoist cylinder 6 which is a hydraulic actuator.
The front frame 2 is provided with a front wheel 7, a cab 8 (cab), and an engine room 9. The engine room 9 is arranged in front of the cab 8 and is covered by an exterior cover 10.

<Driver cab>
As shown in FIGS. 1 to 4, the cab 8 includes a cab main body 11, a door 12, a lid 13, a link mechanism 14, and a closing timing adjustment unit 15.

<Driver cab body>
As shown in FIGS. 2 and 4, the cab main body 11 is formed in a box shape having a space therein. The cab main body 11 is formed with an entrance 21 for a driver of a work vehicle to enter and exit the cab 8, and a ventilation opening 22 for letting air in and out of the cab 8.
The entrance 21 and the ventilation opening 22 may be formed at any part of the cab main body 11. In the present embodiment, the entrance 21 is formed in the side wall 23 of the cab main body 11. The ventilation opening 22 is formed in the bottom wall 24 of the cab main body 11. That is, the ventilation opening 22 opens on the inner surface 24 a of the bottom wall portion 24. The ventilation opening 22 communicates a space inside the cab main body 11 with a space outside the cab main body 11.
The ventilation port 22 may be formed at an arbitrary position on the bottom wall 24. The ventilation opening 22 of the present embodiment is formed at a position that is not depressed by a driver who enters and exits the cab 8. Specifically, the ventilation port 22 is perpendicular to the direction in which the entrance 21 opens along the inner surface 24a of the bottom wall portion 24 (Y-axis direction; hereinafter, also referred to as a second direction) with respect to the entrance 21. (X-axis direction; hereinafter also referred to as first direction)). The direction orthogonal to both the Y-axis direction and the X-axis direction is the height direction (Z-axis direction; hereinafter also referred to as a third direction) of the cab main body 11 orthogonal to the inner surface 24a of the bottom wall portion 24. is there.

<Door>
As shown in FIG. 2, the door 12 opens and closes an entrance 21 of the cab body 11. The door 12 of the present embodiment is rotatably attached to the side wall 23 of the cab body 11. A shaft 25 for rotating the door 12 with respect to the side wall portion 23 (a door rotation shaft 25) extends in the height direction (Z-axis direction) of the cab main body 11. The door rotation shaft 25 is located between the entrance 21 and the ventilation opening 22 arranged in the first direction. The door 12 rotates so as to move away from the entrance 21 to the outside of the cab main body 11, thereby opening the entrance 21 of the cab main body 11.

<Lid part>
As shown in FIGS. 2 and 4, the lid 13 opens and closes the ventilation port 22 of the cab body 11. The lid 13 of the present embodiment is rotatably attached to the bottom wall 24 of the cab body 11. A shaft 26 (lid rotating shaft 26) connecting the lid 13 and the bottom wall 24 to rotate the lid 13 with respect to the bottom wall 24 is formed by the entrance 21 along the inner surface 24 a of the bottom wall 24. It extends in the opening direction (Y-axis direction). The lid rotation shaft 26 is located between the entrance 21 and the ventilation opening 22 arranged in the first direction. The lid 13 is disposed so as to overlap the inner surface 24 a of the bottom wall 24, thereby closing the ventilation port 22 of the cab main body 11. In other words, the space inside the cab main body 11 and the space outside the cab main body 11 are shut off by the lid 13 closing the ventilation opening 22 by the closing operation.
The lid 13 may be formed in any shape. The lid 13 of the present embodiment is formed in a rectangular flat plate shape in a plan view. One side of the lid 13 in a plan view is parallel to the lid rotation axis 26. In the following description, a direction perpendicular to the thickness direction of the lid 13 and away from the lid rotation axis 26 may be referred to as a longitudinal direction of the lid 13.

<Link mechanism>
As shown in FIGS. 2 to 4, the link mechanism 14 includes the door 12 and the lid 13 so that the lid 13 is opened when the door 12 is opened, and the lid 13 is closed when the door 12 is closed. Concatenate. The link mechanism 14 of the present embodiment includes a door-side link 31 and a lid-side link 32. The door-side link 31 and the lid-side link 32 are formed to extend linearly, respectively.

  The door-side link 31 is swingably connected to the door 12 about the first end 31a of the door-side link 31 in the longitudinal direction. The door side link 31 may be directly connected to the door 12, for example. The door-side link 31 of the present embodiment is connected to the door 12 via a first link member 33 and a second link member 34 that constitute the link mechanism 14 together with the door-side link 31.

The first link member 33 is formed in an L shape. The first link member 33 is swingably connected to the door 12 about a first end 33a of the first link member 33 in the longitudinal direction. The first link member 33 is swingable with respect to the door 12 about a first rotation shaft 35 parallel to the door rotation shaft 25.
The second link member 34 is formed to extend linearly. The second link member 34 is swingably connected to the second end 33b of the first link member 33 around a first end 34a of the second link member 34 in the longitudinal direction. The first link member 33 and the second link member 34 are mutually swingable about a second rotation shaft 36 parallel to the door rotation shaft 25.

  The door-side link 31 of the present embodiment is swingably connected to the second end 34b of the second link member 34 around the first end 31a of the door-side link 31 in the longitudinal direction. . The door-side link 31 and the second link member 34 mutually swing around a third rotation shaft 37 extending in a second direction (Y-axis direction) orthogonal to the first direction along the inner surface 24a of the cab body 11. It is possible to move.

The first end 31a of the door-side link 31 is movable only in the first direction with respect to the cab main body 11. This point will be specifically described. As shown in FIGS. 2 and 3, a rail 38 is provided between the first end 31 a of the door-side link 31 and the second end 34 b of the second link member 34. The rail 38 guides the movement of the first end 31a of the door-side link 31 and the movement of the second link member 34 only in the first direction. Specifically, a long hole 38 a extending in the first direction is formed in the rail portion 38. The third rotating shaft 37 that connects the door-side link 31 and the second link member 34 is inserted into the elongated hole 38a. Thereby, the first end 31a of the door-side link 31 and the second link member 34 can be moved only in the first direction with respect to the cab main body 11. For example, the first end 31a and the second link member 34 of the door-side link 31 move toward the lid 13 in the first direction according to the operation of closing the door 12.
The rail 38 described above is fixed to the cab main body 11. Specifically, the rail portion 38 is fixed to the inner surface 24a of the bottom wall portion 24 via a plate member 61 with a slit described later.

As shown in FIGS. 2 and 4, the lid link 32 is swingably connected to the lid 13 about a first end 32 a of the lid link 32 in the longitudinal direction. The lid-side link 32 is swingable with respect to the lid 13 about a fourth rotation shaft 39 extending in the second direction. The lid-side link 32 of the present embodiment is directly connected to the lid 13. The first end 32 a of the lid-side link 32 is connected to a longitudinally intermediate portion of the lid 13.
As shown in FIGS. 2 to 4, the second end 32 b of the lid-side link 32 is swingably connected to the second end 31 b of the door-side link 31. The door-side link 31 and the lid-side link 32 are swingable with each other about a fifth rotation shaft 40 extending in the second direction.

  The above-described door-side link 31 and lid-side link 32 are sequentially arranged in the first direction from the door 12 side (the entrance 21 side) to the lid 13 side (the ventilation port 22 side). The longitudinal direction of the door-side link 31 is such that the second end 31b of the door-side link 31 is positioned farther from the inner surface 24a of the bottom wall 24 in the third direction than the first end 31a. It inclines with respect to the inner surface 24a of the part 24.

<Blockage timing adjustment unit>
The closing timing adjustment unit 15 stops the closing operation of the lid 13 in the first stage of the operation of closing the door 12, and performs the closing operation of the lid 13 in the second stage of the operation of closing the door 12 after the first stage. carry out.
As shown in FIGS. 3 and 5, the closing timing adjustment unit 15 of the present embodiment includes a slot hole 51 formed in the second end 31 b of the door side link 31 and a second end 32 b of the lid side link 32. And a slot projection 52 formed and inserted into the slot hole 51.

The slot hole 51 is formed to extend in the longitudinal direction of the door side link 31. The slot hole 51 is formed in a long hole shape when viewed from the second direction which is the thickness direction of the door-side link 31. The slot hole 51 may be formed so as to insert at least the slot projection 52. The slot hole 51 of the present embodiment is formed to penetrate the door-side link 31 in the second direction.
The slot projection 52 is movable in the longitudinal direction of the slot hole 51 while being inserted into the slot hole 51. The slot projection 52 also serves as the fifth rotation shaft 40 described above. That is, the slot projection 52 connects the door-side link 31 and the lid-side link 32 to be swingable with each other.

  The slot projection 52 is movable in the longitudinal direction with respect to the slot hole 51 in the first stage of the operation of closing the door 12. Further, the slot projection 52 reaches the longitudinal end 53 of the slot hole 51 in the second stage of the operation of closing the door 12. The terminal end 53 of the slot hole 51 is located on the first end 31a side of the door side link 31 in the longitudinal direction. In the following description, the end of the slot hole 51 located on the side opposite to the terminal end 53 of the slot hole 51 in the longitudinal direction of the slot hole 51 is referred to as the start end 54 of the slot hole 51.

  As shown in FIGS. 4 and 5, the closing timing adjustment unit 15 of the present embodiment includes a first projection 55 fixed to the cab body 11, a second projection 56 provided on the lid-side link 32, Is further provided. That is, the closing timing adjustment unit 15 of the present embodiment includes the slot hole 51, the slot projection 52, the first projection 55, and the second projection 56.

The first protrusion 55 of the present embodiment is fixed to the inner surface 24a of the bottom wall portion 24 via a plate member 61 with a slit described later.
The first protrusion 55 is located between the inner surface 24 a of the bottom wall 24 and the lid-side link 32 in a direction (Z-axis direction) orthogonal to the inner surface 24 a of the bottom wall 24. The first protrusion 55 is located in the middle of the movement range of the second end 32b of the cover-side link 32 that moves in the first direction as the cover 13 opens and closes.

The first protrusion 55 has a pressed surface 57 against which the second protrusion 56 is pressed toward the door 12 in the first direction. The pressed surface 57 may be perpendicular to the inner surface 24a of the bottom wall 24, for example. In the present embodiment, the pressed surface 57 is inclined in the first direction from the door 12 toward the lid 13 in the first direction as the distance from the inner surface 24a of the bottom wall 24 increases in the Z-axis direction. That is, the pressed surface 57 is a surface inclined at a predetermined angle with respect to the third direction.
In addition, the first protrusion 55 has an inclined surface 58 facing the opposite side to the pressed surface 57 in the first direction. The inclined surface 58 is inclined from the door 12 side toward the lid 13 side in the first direction as it approaches the inner surface 24a of the bottom wall portion 24 in the Z-axis direction.

The second protrusion 56 of the present embodiment projects from the second end 32 b of the lid-side link 32 toward the inner surface 24 a of the bottom wall 24.
The second protrusion 56 is pressed against the first protrusion 55 toward the cover 13, thereby restricting the movement of the cover-side link 32 in a direction to close the cover 13. For example, the second protrusion 56 may be pressed against the first protrusion 55 in a state where the door 12 and the cover 13 are completely opened. In this embodiment, as illustrated in FIGS. 2 and 4, in a state where the door 12 and the lid 13 are completely opened, the second protrusion 56 is closer to the door 12 than the first protrusion 55 (first direction side). ) At an interval. For this reason, the second protrusion 56 is pressed against the first protrusion 55 in the middle of closing the lid 13. The pressing of the second protrusion 56 against the first protrusion 55 is released when the slot protrusion 52 reaches the longitudinal end 53 of the slot hole 51 due to the movement of the door-side link 31.

<Elastic member>
As shown in FIG. 4, the cab 8 of the present embodiment further includes an elastic member 16. The elastic member 16 is provided between the lid 13 and the cab main body 11. The elastic member 16 urges the lid 13 in the closing direction by an elastic force. The elastic member 16 may be a torsion spring, rubber, or the like. The elastic member 16 of the present embodiment is a coil spring. The first end of the elastic member 16 is attached to the facing surface 13 a of the lid 13 facing the ventilation port 22. The second end of the elastic member 16 is attached to the attachment portion 27 of the cab main body 11 arranged outside the ventilation port 22. The mounting portion 27 may be formed separately from the bottom wall portion 24 as shown in FIG. 4 and fixed to the bottom wall portion 24, or may be formed integrally with the bottom wall portion 24, for example. By attaching the elastic member 16 in this manner, it is possible to prevent the elastic member 16 from obstructing the lid 13 from blocking the ventilation opening 22. That is, since the elastic member 16 has the property of expanding and contracting (elastic force), a force is generated during the closing operation of the lid 13 so that the elastic member 16 contracts, so that the lid 13 is An attempt is made to close the rotation shaft 26 as a rotation shaft. Further, even in a state where the closing operation of the lid 13 is completed (a state in which the lid 13 closes the ventilation opening 22), a force is generated such that the elastic member 16 contracts, so that the lid 13 closes the opening 22. To maintain.
When the elastic member 16 is a torsion spring or a coil spring, the elastic member 16 may be attached to, for example, a lid rotating shaft 26 provided between the lid 13 and the cab body 11.

  As shown in FIGS. 2 to 5, the cab 8 of the present embodiment includes a plate member 61 with a slit fixed to the cab body 11 and interposed between the door-side link 31 and the lid-side link 32 in the second direction. Further prepare. A slit 62 that penetrates in the second direction and allows the slot projection 52 (the fifth rotation shaft 40) to pass therethrough is formed in the plate member 61 with a slit. The slit 62 is formed so that the movement range of the slot projection 52 accompanying the opening / closing operation of the door 12 becomes appropriate.

  As shown in FIGS. 4 and 5, the cab 8 of the present embodiment further includes a support 63 fixed to the cab body 11. The support 63 supports the second protrusion 56 from the inner surface 24 a side of the bottom wall 24. The support portion 63 is disposed at a position adjacent to the first protrusion 55 on the door 12 side in the first direction. The support portion 63 has a support surface 64 that extends in the first direction so as to be parallel to the inner surface 24 a of the bottom wall portion 24 and supports the second protrusion 56. The support surface 64 is located closer to the inner surface 24a of the bottom wall 24 than the first protrusion 55 (particularly, the pressed surface 57). The pressed surface 57 and the support surface 64 are continuously connected. 4 and 5, the support portion 63 is formed integrally with the first protrusion 55, but the present invention is not limited to this.

<Effects>
Next, the operation of the cab 8 of the present embodiment will be described with reference to FIGS. 6 to 11, the structure of the cab 8 shown in FIGS. 2 to 4 is simplified or modified in order to explain the operation of the cab 8. First, the operation when closing the door 12 will be described with reference to FIGS.
As shown in FIG. 6, when the door 12 and the lid 13 are completely opened, the second protrusion 56 is positioned at a distance from the first protrusion 55 on the door 12 side. The slot projection 52 reaches the starting end 54 of the slot hole 51 by the elastic force of the elastic member 16. For this reason, when the door 12 is closed as shown by the arrow ND1 from the state where the door 12 and the lid 13 are completely opened, as shown in FIGS. Until it is pressed against the door 55, the closing operation of the lid 13 is performed as shown by the arrow NC1 in conjunction with the closing operation of the door 12. At this time, the second protrusion 56 may be located away from the support surface 64 of the support 63 or may be arranged on the support surface 64 of the support 63.

  As shown in FIG. 7, in a state where the second protrusion 56 is pressed against the first protrusion 55, the movement of the cover-side link 32 in a direction to close the cover 13 is restricted. That is, the closing operation of the lid 13 stops. In this state, when the closing operation of the door 12 is continued as indicated by the arrow ND1, the first end 31a of the door-side link 31 moves in the first direction toward the lid 13 side as indicated by the arrow N. Moving. Therefore, the door-side link 31 moves relative to the lid-side link 32 such that the slot projection 52 moves from the start end 54 of the slot hole 51 toward the end 53. Thus, the closing operation of the door 12 can be performed while the closing operation of the lid 13 is stopped. The operation at this stage corresponds to the first stage of the operation of closing the door 12 described above.

Then, as shown in FIG. 8, by further continuing the closing operation of the door 12 indicated by the arrow ND <b> 1, when the slot projection 52 reaches the terminal end 53 of the slot hole 51, The pressing of the two protrusions 56 is released. Hereinafter, this point will be specifically described.
The longitudinal direction of the door-side link 31 is located on the inner surface 24a of the bottom wall 24 so that the second end 31b of the door-side link 31 is located farther from the inner surface 24a of the bottom wall 24 than the first end 31a. It is inclined to. For this reason, after the slot projection 52 reaches the terminal end 53 of the slot hole 51, the first end 31 a of the door-side link 31 further moves in the first direction toward the lid 13 with the closing operation of the door 12. When moved, the second end portion 32b of the lid side link 32 including the second end portion 31b of the door side link 31 and the second protrusion 56 moves in the direction away from the inner surface 24a of the bottom wall portion 24 so that the door side moves. The link 31 rotates about its first end 31a. Thus, the pressing of the second protrusion 56 against the first protrusion 55 is released.
When the pressed surface 57 of the first protrusion 55 is inclined as illustrated in FIG. 4, the swing center of the lid-side link 32 (that is, the fourth rotation shaft 39) is set to the first protrusion 55. Even if it is located closer to the inner surface 24a of the bottom wall 24, the pressing of the second protrusion 56 against the first protrusion 55 can be smoothly released.

When the pressing of the second projection 56 against the first projection 55 is released with the closing operation of the door 12, the movement of the lid-side link 32 in the direction of closing the lid 13 (the direction shown by the arrow NC1) is allowed. Is done. In this state, since the slot projection 52 has reached the terminal end 53 of the slot hole 51, the lid-side link 32 is moved toward the lid 13 by the movement of the door-side link 31 accompanying the closing operation of the door 12 indicated by the arrow ND1. Can be pressed. Thereby, the closing operation of the lid 13 can be performed, and the ventilation port 22 can be closed by the lid 13. Further, in the present embodiment, since the lid 13 is urged in the direction to close the lid 13 by the elastic force of the elastic member 16, the ventilation port 22 can be quickly and reliably closed by the lid 13. The operation at this stage corresponds to the second stage of the operation of closing the door 12 described above.
Thus, the operation of closing the door 12 and the lid 13 is completed.

  In the second stage of the operation of closing the door 12, the pressing of the second protrusion 56 against the first protrusion 55 is released immediately before the door 21 of the cab body 11 is closed by the door 12, as illustrated in FIG. It may be performed at the same time as the closing of the entrance 21 of the cab main body 11 by the door 12, for example. When the pressing of the second protrusion 56 is released immediately before the closing of the entrance 21 of the cab main body 11, the entrance 21 and the ventilation opening 22 can be closed at the same time. When the pressing of the second protrusion 56 is released and the closing of the entrance 21 of the cab main body 11 is performed at the same time, the ventilation opening 22 can be closed immediately after the closing of the entrance 21. That is, the ventilation opening 22 is not closed before the entrance 21.

  When the door 12 and the lid 13 are completely closed, the second projection 56 is located closer to the lid 13 than the pressed surface 57 of the first projection 55 in the first direction. The second protrusions 56 may be arranged above the inclined surface 58 of the first protrusion 55 at intervals. In the present embodiment, the second protrusion 56 is disposed on the inclined surface 58 of the first protrusion 55 as illustrated in FIG.

Next, an operation of opening the door 12 will be described with reference to FIGS.
When the door 12 is opened in the direction indicated by the arrow ND2 from the state where the door 12 and the lid 13 are completely closed, as shown in FIG. It is pulled toward and moves in the first direction. Thereby, the slot projection 52 is located at the start end 54 of the slot hole 51, and the lid link 32 moves in the first direction together with the door link 31 toward the door 12 side. At this time, since the second projection 56 of the lid-side link 32 is disposed on the inclined surface 58 of the first projection 55, the movement of the lid-side link 32 is not hindered by the first projection 55. Absent. Along with the movement of the lid side link 32, the force for opening the lid 13 acts on the lid 13 so as to exceed the elastic force of the elastic member 16, and the lid 13 opens in the direction shown by the arrow NC2.

Thereafter, as shown in FIG. 10, when the door 12 is further opened in the direction indicated by the arrow ND2, and the second protrusion 56 of the lid-side link 32 moves closer to the door 12 than the first protrusion 55 in the first direction. The second protrusion 56 is disposed on the support surface 64 of the support 63, and is located on the door 12 side with respect to the pressed surface 57 of the first protrusion 55. In this state, the second protrusion 56 is pressed against the pressed surface 57 of the first protrusion 55 even when the lid 13 is moved in the closing direction by the elastic force of the elastic member 16 or the like. Therefore, it is possible to prevent the lid 13 and the door 12 from being closed by the elastic force of the elastic member 16 or the like.
Then, as shown in FIG. 11, by further opening the door 12 in the direction indicated by the arrow ND2, the door 12 and the lid 13 can be completely opened.

  As described above, according to the cab 8 according to the present embodiment, since the means for linking the opening and closing of the lid 13 with the opening and closing of the door 12 is the link mechanism 14 which is a mechanical means, the electric mechanism is electrically operated. The durability against dust and vibration of the dump truck is higher than that of the means. Thereby, the manufacturing cost of the cab 8 can be reduced. Further, in the cab 8 according to the embodiment, since a power supply required by electric means is not necessary, for example, even if the engine is not started to supply electric power to the electric means, the door 12 and the door 12 are not required. The lid 13 can be easily closed.

  Further, according to the cab 8 of the present embodiment, the closing operation of the lid 13 is stopped by the closing timing adjustment unit 15 in the first stage of the operation of closing the door 12. That is, even when the closing operation of the door 12 is continued, the lid 13 can be kept in a largely open state. Therefore, in the first stage, the air in the cab 8 can be efficiently exhausted from the ventilation port 22 to the outside of the cab 8. Thereby, when the door 12 is closed, an increase in the air pressure in the cab 8 can be effectively suppressed. Therefore, the door 12 of the cab 8 can be easily closed with a small force.

  Further, according to the cab 8 of the present embodiment, in the second stage of the operation of closing the door 12 of the cab 8, the closing operation of the lid 13 is performed by the closing timing adjustment unit 15 and the elastic member 16. For this reason, at the same time as the door 12 closes the entrance 21 or immediately after the door 12 closes the entrance 21, the ventilation port 22 can be quickly closed by the lid 13. Thereby, it is possible to effectively prevent foreign matter such as dust existing outside the cab 8 from entering the cab 8 through the ventilation port 22.

Further, according to the cab 8 of the present embodiment, the closing timing adjustment unit 15 includes the slot hole 51 formed in the door-side link 31 and the slot projection 52 formed in the lid-side link 32.
For this reason, in the first stage of the operation of closing the door 12, even if the door-side link 31 moves in accordance with the operation of closing the door 12, the slot projection 52 of the lid-side link 32 is moved to the slot hole 51 of the door-side link 31. , The door-side link 31 can be moved relative to the lid-side link 32. This can prevent the lid-side link 32 from moving in conjunction with the operation of closing the door 12. That is, in the first stage of the operation of closing the door 12, the closing operation of the lid 13 can be stopped.
On the other hand, in the second stage of the operation of closing the door 12, the slot projection 52 of the lid side link 32 reaches the longitudinal end 53 of the slot hole 51, and the lid side link 31 moves in conjunction with the movement of the door side link 31. The link 32 can be moved. That is, the closing operation of the lid 13 can be performed in conjunction with the operation of closing the door 12.

  Further, according to the operator's cab 8 of the present embodiment, the closing timing adjustment unit 15 includes the first projection 55 fixed to the operator's cab main body 11 and the lid link 32 in addition to the slot hole 51 and the slot projection 52. And a second protrusion 56 provided on the second member. For this reason, the second projection 56 of the lid link 32 is pressed against the first projection 55 in a state where the slot projection 52 has not reached the longitudinal end 53 of the slot hole 51, and the lid link 32 can be reliably prevented from moving together with the door-side link 31. That is, it is possible to reliably prevent the closing operation of the lid 13 from being performed in the first stage of the operation of closing the door 12.

  Further, according to the cab 8 of the present embodiment, the elastic member 16 is provided between the lid 13 and the cab main body 11 to urge the lid 13 in the closing direction by elastic force. Therefore, the lid 13 can be closed quickly and reliably by the elastic force of the elastic member 16. By closing the lid 13 quickly, foreign substances such as dust can be further suppressed from entering the cab 8 through the ventilation port 22. Further, even when the lid 13 is closed, the state in which the ventilation port 22 is closed by the elastic force of the elastic member 16 is maintained, so that the airtightness of the internal space of the cab 8 is maintained.

<Other embodiments>
The embodiments of the present invention have been described above, but the present invention is not limited thereto, and can be appropriately changed without departing from the technical idea of the present invention.

The operator's cab 8 of the present invention may not include, for example, the elastic member 16. The lid 13 may be provided, for example, so that gravity acts in a direction in which the lid 13 is closed. In this case, the lid 13 can be closed using gravity instead of elastic force.
Further, in the operator's cab 8 of the present invention, elastic force or gravity may not act on the lid 13 in the direction in which the lid 13 is closed. Even in such a case, when the pressing of the second protrusion 56 against the first protrusion 55 is released, the closing of the door 12 is performed because the slot protrusion 52 reaches the terminal end 53 of the slot hole 51. The lid side link 32 can be pushed toward the lid part 13 by the movement of the door side link 31 accompanying the operation. Thereby, the closing operation of the lid 13 can be performed.

  In the cab 8 of the present invention, the ventilation port 22 may be formed in the side wall 23 of the cab main body 11, for example, like the entrance 21. In this case, the link mechanism 14 and the closing timing mechanism 15 may be provided so as not to correspond to the inner surface 24 a of the bottom wall portion 24 but to correspond to the inner surface of the side wall portion 23.

  The operator's cab of the present invention is not limited to being applied to an articulated dump truck, but may be applied to any work vehicle such as a rigid dump truck, a hydraulic shovel, a bulldozer, a motor grader, and a crane.

DESCRIPTION OF SYMBOLS 1 ... Dump truck, 8 ... Cab, 11 ... Cab body, 12 ... Door, 13 ... Lid, 14 ... Link mechanism, 15 ... Closure timing adjustment part, 16 ... Elastic member, 21 ... Doorway, 22 ... Ventilation port , 23 ... side wall part, 24 ... bottom wall part, 24a ... inner surface, 31 ... door side link, 32 ... lid side link, 33 ... first link member, 34 ... second link member, 38 ... rail part, 51 ... slot Hole, 52: Slot projection, 53: End, 54: Start end, 55: First projection, 56: Second projection, 57: Pressed surface, 58: Inclined surface

Claims (5)

A driver's cab main body having an entrance and a vent,
A door for opening and closing the entrance,
A lid for opening and closing the ventilation port,
A link mechanism that connects the door and the lid so that the lid opens when the door is opened, and the lid closes when the door is closed,
Closing timing adjustment in which the closing operation of the lid is stopped in the first stage of the operation of closing the door, and the closing operation of the lid is performed in the second stage of the operation of closing the door after the first stage Department and
The driver's cab of a working vehicle comprising: The link mechanism is
A door-side link pivotally connected to the door around a first end,
A lid-side link pivotally connected to the lid around the first end, and a second end pivotally connected to the second end of the door-side link; With
The closing timing adjustment unit,
A slot hole formed at a second end of the door-side link so as to extend in a longitudinal direction of the door-side link;
A slot projection formed at a second end of the lid-side link and inserted into the slot hole, the slot projection being movable in a longitudinal direction of the slot hole in the first step; The cab of a work vehicle according to claim 1, further comprising: a slot projection reaching a longitudinal end of the slot hole. The closing timing adjustment unit,
A first protrusion fixed to the cab body,
A second projection provided on the lid-side link, for regulating the movement of the lid-side link by being pressed against the first projection toward the lid.
The cab of the work vehicle according to claim 2, wherein the pressing of the second protrusion against the first protrusion is released when the slot protrusion reaches the longitudinal end of the slot hole. The door, the door-side link, the lid-side link, and the lid are sequentially arranged in a first direction along an inner surface of the cab body where the ventilation opening is opened,
The longitudinal direction of the door-side link is inclined with respect to the inner surface such that the second end of the door-side link is located farther from the inner surface than the first end,
The first end of the door-side link is movable in the first direction only with respect to the cab body, and moves toward the lid in response to an operation of closing the door,
The first protrusion is fixed to the inner surface of the cab body, and is located between the lid side link and the inner surface,
The cab of the working vehicle according to claim 3, wherein the second protrusion projects from the second end of the lid-side link toward the inner surface.   The work vehicle according to any one of claims 1 to 4, further comprising an elastic member provided between the lid and the cab main body, the elastic member being biased in a direction to close the lid by an elastic force. Driver's cab.

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