JP2019056218A - Working vehicle - Google Patents

Abstract

To provide a working vehicle which allows a bonnet to be opened without making its engine stop, and in that case which can prevent its unexpected movement.SOLUTION: A revolving working vehicle 1 is provided with a bonnet 38, console 52, a solenoid valve 64, and a safety frame 66. The bonnet 38 covering an engine 33 can open/close through being rotatably supported by a rotation axis behind the engine 33. The console 52 provided with a work control lever 65 is rotatably supported relative to the bonnet 38 and can switch between a first position and a second position by rotating. The solenoid valve 64 makes an operation of the work control lever 65 valid where the console 52 is at the first position and the bonnet 38 is closed, and makes the operation of the work control lever 65 invalid for other cases.The safety frame 66 prevents the bonnet 38 from opening/closing where the console 52 is in the first position and allows it to open/close where in the second position.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a work vehicle including an openable / closable bonnet.

  Conventionally, in a work vehicle having a tiltable cab, various configurations have been proposed that prevent operation of the work vehicle when the tilt of the cab is detected. Patent Documents 1 and 2 disclose this type of work vehicle.

  In the construction machine disclosed in Patent Document 1, a driver's cab provided with a driver's seat is configured to be tilted up by a screw shaft. A rotary switch that switches to ON / OFF is attached near the rotation center of the cab. The rotary switch is turned off when detecting the tilt-up of the driver's seat, whereby the fuel line is closed by the solenoid, the engine is stopped, and the construction machine becomes inoperable. However, if it is desired to check the operation with the cab tilted up, the auxiliary switch device can be used to start the engine.

  The backhoe of Patent Document 2 is provided at the lever main body provided on the inner surface of the rear surface of the bonnet, the gripping portion protruding outward from the back surface of the lever main body, and the base end of the lever main body. An engine stop switch. In this backhoe, the engine stop switch is turned on and the engine is stopped when the button of the engine stop switch is pressed by the lever body in conjunction with the opening operation of the bonnet.

JP 2006-45955 A Japanese Utility Model Publication No. 63-131831

  However, in the configuration of Patent Document 1, for example, when a tilt down operation is performed while the engine is operating in a state where the cab is tilted up, the operator touches the operation lever unexpectedly at the moment of the tilt down operation, There was a possibility that the work machine could operate unintentionally, and there was room for improvement.

  In the configuration of Patent Document 2, for example, even when it is desired to check the operation of hydraulic equipment or maintain the hydraulic circuit while the engine is operating, when the hood is opened, the engine is forcibly stopped by pressing the engine stop button. Resulting in. For this reason, after opening the bonnet, it is necessary to start the engine again.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a work vehicle that can open the bonnet without stopping the engine and prevent unexpected operations even in that case. .

Means and effects for solving the problems

  The problems to be solved by the present invention are as described above. Next, means for solving the problems and the effects thereof will be described.

  According to an aspect of the present invention, a work vehicle having the following configuration is provided. In other words, the work vehicle includes a bonnet, a console, a lock unit, and a safety device. The bonnet is supported so as to be rotatable about a rotating shaft disposed behind the engine, covers the engine, and can be opened and closed. The console has an operation lever operated by an operator, is rotatably supported by the bonnet, and can be switched from the first posture to the second posture by rotating in the same direction as the rotation direction of opening the bonnet. It can be switched from the second posture to the first posture by rotating in the opposite direction. The lock portion validates the operation of the operation lever when the console is in the first posture and the bonnet is closed, and invalidates the operation of the operation lever at other times. The safety device prevents the bonnet from being opened and closed when the console is in the first posture, and allows the bonnet to be opened and closed when the console is in the second posture.

  Thereby, it is possible to open a bonnet in the state which made the console the 2nd attitude | position, and maintenance of an engine etc. can be performed in connection with this. When the bonnet is in the open state or when the console is in the second posture, the operation of the work implement is invalidated by the lock unit. Therefore, for example, when the hood is opened with the engine running and maintenance of the hydraulic circuit is performed, even if the operation lever is accidentally touched, the corresponding operation is prevented from being performed. be able to. Further, the safety device can ensure that the console is in the second posture when the bonnet is opened and closed. Therefore, it is possible to reliably prevent the operation of the work vehicle by touching the operation lever when opening and closing the bonnet.

  The work vehicle preferably has the following configuration. That is, this work vehicle includes a driver seat. The safety device includes a support column and a restricting unit. The struts are arranged in a pair at intervals in the width direction of the driver seat. The restricting portion connects the struts to each other. A distance between the rotation center of the bonnet and the tip of the operation lever in the first posture is a radius, and a first virtual circle centered on the rotation center of the bonnet is considered. Also, a second virtual circle centered on the rotation center of the bonnet is considered with the distance between the rotation center of the bonnet and the tip of the operation lever in the second posture as a radius. At this time, at least a part of the restricting portion is disposed inside the first virtual circle. All of the restricting portion is disposed outside the second virtual circle.

  Thereby, when a console is a 1st attitude | position, rotation of a bonnet is prevented because an operation lever contacts a control part. Therefore, it is possible to reliably prevent the bonnet from opening and closing while the console is in the first posture.

  The work vehicle preferably has the following configuration. That is, a third imaginary circle centered on the rotation center of the console with the bonnet closed with the distance between the rotation center of the console and the tip of the operation lever as a radius is considered. At this time, all of the restriction portions are disposed outside the third virtual circle.

  As a result, when the hood is closed, the restricting portion does not get in the way when switching the attitude of the console, and therefore a series of operations for opening and closing the hood can be performed smoothly.

  In the work vehicle described above, it is preferable that the restricting portion is formed so as to be forward as it approaches the connection portion from the middle portion in the longitudinal direction to the support column.

  As a result, it is possible to secure a space around the operator sitting on the driver's seat and improve comfort.

1 is a perspective view showing an overall configuration of a turning work vehicle according to an embodiment of the present invention. The perspective view which looked at the turning work vehicle from the back side. The conceptual diagram explaining the lock function which invalidates operation by a work operation lever with a solenoid valve. The side view explaining switching of the attitude | position of a console and opening and closing of a bonnet.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an overall configuration of a turning work vehicle 1 according to an embodiment of the present invention. FIG. 2 is a perspective view of the turning work vehicle 1 as seen from the back side. FIG. 3 is a conceptual diagram illustrating a lock function for invalidating the operation by the work operation lever 65 by the electromagnetic valve 64. FIG. 4 is a side view for explaining the switching of the posture of the console 52 and the opening and closing of the hood 38.

  A turning work vehicle (working vehicle) 1 according to this embodiment shown in FIGS. 1 and 2 includes a lower traveling body 11 and an upper turning body 12.

  The lower traveling body 11 includes a crawler traveling device 21 arranged in a pair on the left and right sides, and a hydraulic motor (not shown) that drives the crawler traveling device 21. The lower traveling body 11 can drive the left and right crawler traveling devices 21 individually in various directions and speeds, and can perform various traveling such as straight traveling forward or backward, steering, and the like.

  The upper swing body 12 includes a swing frame 31, an engine 33, a hydraulic pump unit 34, a bonnet 38, a control unit 35, and a work device 13.

  The turning frame 31 is disposed above the lower traveling body 11 and supported by the lower traveling body 11 so as to be rotatable about a vertical axis. The turning frame 31 can rotate with respect to the lower traveling body 11 by driving a turning motor (not shown). The engine 33 is configured as a diesel engine, for example, and is disposed at the rear portion of the turning frame 31. The hydraulic pump unit 34 is driven by the engine 33 and generates oil pressure necessary for traveling and working of the turning work vehicle 1.

  The bonnet 38 covers and protects the upper surface of the engine 33 and the like. As shown in FIG. 2, the rear portion of the bonnet 38 is connected to the revolving frame 31 by a hinge portion 45 arranged in a pair of left and right at the rear portion of the revolving frame 31.

  Thereby, the bonnet 38 can be rotated with respect to the turning frame 31 around the rotating shaft 45c arranged in the horizontal direction. Specifically, the bonnet 38 can be opened by rotating rearward and upward, and can be closed by rotating in the opposite direction.

  The control unit 35 includes various operation members. The operation members include a travel operation lever 36 and a work operation lever 65 that are arranged in a pair on the left and right. In the present embodiment, the work operation lever 65 corresponds to an operation lever. The operator can give various instructions to the turning work vehicle 1 by operating the operation member.

  The work device 13 includes a boom 41, an arm 42, and a bucket 43. A hydraulic cylinder is connected to each of the boom 41, the arm 42, and the bucket 43, and various operations such as excavation by the bucket 43 can be performed by extending and contracting the hydraulic cylinder.

  Next, the console 52 including the work operation lever 65 will be described.

  As shown in FIG. 1, a driver's seat 39 on which an operator sits is disposed at the left and right center of the upper surface of the upper swing body 12. And the console 52 is arrange | positioned by 1 pair of right and left so that the driver's seat 39 may be pinched | interposed. The driver's seat 39 and the console 52 are disposed on the upper surface of the bonnet 38 included in the upper swing body 12.

  The left and right consoles 52 have a symmetrical configuration, and the configuration is substantially the same. Each console 52 includes a box body 55, the above-described work operation lever 65, and a lock lever 56.

  The box main body 55 is formed in a hollow shape, and covers and protects various mechanisms (for example, a remote control valve 62 and a console switch 76 described later) disposed therein. The work operation lever 65 and the lock lever 56 are arranged so as to protrude from the box body 55.

  As shown in FIG. 2, a remote control valve 62 is disposed inside the box body 55 in each of the left and right consoles 52. As shown in FIG. 3, each of the left and right remote control valves 62 includes one input port and four output ports.

  The discharge port of the hydraulic pump provided in the hydraulic pump unit 34 is connected to the input port of the remote control valve 62 via a pipe (not shown). However, as shown in FIGS. 2 and 3, an electromagnetic valve (locking portion) 64 provided in the turning work vehicle 1 is disposed on the hydraulic oil path connecting the hydraulic pump and the remote control valve 62. As shown in FIG. 3, a relief valve for releasing pressure is disposed between the hydraulic pump of the hydraulic pump unit 34 and the electromagnetic valve 64.

  As shown in FIGS. 2 and 3, the output port of the remote control valve 62 is connected to a control valve 84 provided in the turning work vehicle 1 via a pipe (not shown). The remote control valve 62 opens and closes between the input port and each output port in response to the operator operating the work operation lever 65 forward, backward, left and right. When the output port is opened, hydraulic oil is sent from the remote control valve 62 to the control valve 84.

  As conceptually shown in FIG. 3, the control valve 84 includes a plurality of spools for switching driving / stopping of the hydraulic actuator provided in the work device 13 or the like. The control valve 84 moves the hydraulic actuator by performing displacement of the spool using the hydraulic oil sent from the remote control valve 62 as a pilot pressure, and performs various operations using the upper swing body 12 and the work device 13. be able to.

  As shown in FIG. 2, the box body 55 is rotatably supported by a bracket (not shown) fixed to the upper surface of the bonnet 38 via a hinge shaft 61 arranged in the left-right direction. Thereby, the attitude | position of the console 52 can be switched between the 1st attitude | position P1 and the 2nd attitude | position P2, as shown by the white arrow of FIG.

  In a state in which the hood 38 is closed, the first posture P1 of the console 52 is a substantially horizontal posture, and the second posture P2 is a posture that is flipped up backward from the first posture P1. The rotation direction for switching the console 52 from the first posture P1 to the second posture P2 coincides with the rotation direction when the hood 38 in the closed state is opened.

  The console 52 includes an appropriate cam mechanism, and the rotation of the console 52 is restricted so that the console 52 does not rotate unexpectedly with respect to the bonnet 38 from any of the first posture P1 and the second posture P2. Can do. As this cam mechanism, for example, an arbitrary cam such as a groove cam can be used.

  The lock lever 56 is supported by the box body 55 so as to be rotatable around a horizontal axis in the horizontal direction. The operator releases the restriction of rotation by the cam mechanism by rotating the lock lever 56 and moves the box body 55 between the first posture P1 and the second posture P2 (in other words, the console 52). Can be rotated.

  The bonnet switch 75 is attached to an appropriate position of the turning frame 31. The bonnet switch 75 includes a contact. When the bonnet 38 is closed, the bonnet switch 75 is arranged so that the contact is pushed by a small operating member fixed to the inner wall of the bonnet 38. The bonnet switch 75 is configured such that the contact is closed when the contact is pushed in and the contact is opened when the contact is not pushed. Thereby, the bonnet switch 75 can detect the open / closed state of the bonnet. The bonnet switch 75 outputs a detection result relating to the opening and closing of the bonnet 38 to the electromagnetic valve 64.

  The console switch 76 is attached to an appropriate position inside the box body 55 provided in each of the left and right consoles 52. Each console switch 76 includes a contact, and when the console 52 is in the first posture P1, the contact is pushed by an appropriate member (for example, the cam lever included in the cam mechanism described above). Yes. The console switch 76 is configured such that the contact is closed when the contact is pushed in and the contact is opened when the contact is not pushed. Thereby, the console switch 76 can detect the attitude | position of a console. Each of the left and right console switches 76 is electrically connected to the electromagnetic valve 64, and outputs a detection result related to the attitude of the console 52 to the electromagnetic valve 64.

  The electromagnetic valve 64 is opened when all the left and right console switches 76 and the bonnet switch 75 are closed. On the other hand, when at least one of the left and right console switches 76 and the bonnet switch 75 is open, the valve is closed.

  Therefore, when the left and right consoles 52 are in the first posture P1 and the bonnet 38 is in the closed state, the solenoid valve 64 supplies hydraulic oil to the remote control valve 62 and works by the work operation lever 65. The operation of the device 13 or the like is made valid. On the other hand, in cases other than the above, the supply of hydraulic oil to the remote control valve 62 is shut off, and the operation of the work device 13 and the like by the work operation lever 65 is invalidated.

  As shown in FIGS. 1 and 2, etc., a safety frame (safety device) 66 for fixing a space around the operator when the turning work vehicle 1 falls is fixed to the rear portion of the turning frame 31. However, in FIG. 2, the safety frame 66 is shown in a perspective view with a chain line in order to easily show the internal structure of the hood 38.

  The safety frame 66 is configured in a two-post type and has an inverted U shape when viewed from the front. The safety frame 66 includes two support columns 70, a first connecting portion 71, and a second connecting portion (regulating portion) 72.

  Each of the support columns 70 is generally configured as a member elongated in the vertical direction, and is disposed in a pair of left and right on the upper swing body 12. The lower part of each support column 70 is fixed to the rear side of the engine 33 and the diagonally left and right rear part of the revolving frame 31. The two struts 70 are arranged so as to be sufficiently spaced from each other in the left-right direction of the upper swing body 12. Therefore, the support column 70 does not get in the way when the bonnet 38 is opened and closed and the position of the console 52 is switched.

  The 1st connection part 71 is comprised as an elongate member in the left-right direction. The 1st connection part 71 is integrally formed with respect to the said support | pillar 70 so that the upper ends of the right and left support | pillar 70 may be connected.

  The 2nd connection part 72 is comprised as an elongate member substantially in the left-right direction. The 2nd connection part 72 is arrange | positioned in the position lower than the 1st connection part 71 so that the right and left support | pillars 70 may be connected. The second connecting portion 72 has a bent portion so as to become forward as it approaches the both end portions (that is, the connecting portion to the support column 70) from the middle portion in the longitudinal direction.

  Next, the arrangement of the second connecting portion 72 will be specifically described with reference to FIG. In FIG. 4, when an arc-shaped locus drawn by the tip of the work operation lever 65 is considered when the console 52 is rotated, a cross section of the second connecting portion 72 cut along a virtual plane including this locus is shown. Shown with hatching.

  That is, as shown in FIG. 4, a first virtual circle C1 centered on the rotation shaft 45c is considered with the distance between the rotation shaft 45c of the bonnet 38 and the tip of the work operation lever 65 in the first posture P1 as a radius. Further, a second virtual circle C2 centered on the rotation shaft 45c is considered with the distance between the rotation shaft 45c and the tip of the work operation lever 65 in the second posture P2 as a radius. At this time, the 2nd connection part 72 is arrange | positioned inside the 1st virtual circle C1, and the outer side of the 2nd virtual circle C2.

  Further, as shown in FIG. 4, the distance between the hinge shaft 61 that is the center of rotation of the console 52 and the tip of the work operation lever 65 is a radius, and the hinge shaft 61 with the bonnet 38 closed is the center. Consider three virtual circles C3. At this time, the 2nd connection part 72 is arrange | positioned on the outer side of the 3rd virtual circle C3.

  Thus, the following effects can be acquired by arrange | positioning the 2nd connection part 72 (specifically the part shown by hatching in FIG. 4). That is, in the state where the console 52 is in the first posture P1, even if the bonnet 38 is to be rotated, the work operation lever 65 interferes with the second connecting portion 72, so that the bonnet 38 cannot be opened. However, when the hood 38 is closed, the console 52 can be switched from the first posture P1 to the second posture P2. If the console 52 is switched to the second posture P2, when the bonnet 38 is rotated in this state, the upper end of the work operation lever 65 passes closer to the rotation shaft 45c of the bonnet 38 than the second connecting portion 72. Therefore, the bonnet 38 can be opened as shown by a chain line in FIG.

  Next, the opening and closing operation of the bonnet 38 will be described.

  An operation for opening the closed hood 38 will be described. For each of the left and right consoles 52, the operator operates the lock lever 56 to switch the console 52 from the first posture P1 to the second posture P2.

  As a result of this work, since the console switch 76 detects that the console 52 is in the second posture P2, the electromagnetic valve 64 is closed and the operation of the left and right work operation levers 65 is invalidated. Accordingly, for example, even when the operator 33 unexpectedly contacts the work operation lever 65 while the hood 38 is being opened while the engine 33 is in operation, the work device 13 or the like moves along with this contact. Is prevented. Therefore, the hood 38 can be opened with peace of mind.

  Subsequently, the operator puts a hand on an appropriate portion of the bonnet 38 and rotates it rearward and upward. Finally, the bonnet 38 rotates in a front-opening manner to the position indicated by the chain line in FIG. Thereby, the inside (for example, engine 33) of the bonnet 38 can be accessed easily.

  If at least one of the left and right consoles 52 is in the first posture P1, even if the bonnet 38 is to be opened, the work operation lever 65 interferes with the second connecting portion 72 and cannot be opened. Accordingly, it is possible to urge the operator to perform the correct procedure for opening the hood 38 after setting both the left and right consoles 52 to the second posture P2.

  As a result of the operator accidentally opening the hood 38 with the console 52 in the first posture P1, the work operation lever 65 may hit the second connecting portion 72 and the remote control valve 62 may be operated. However, in this embodiment, since the bonnet switch 75 detects the open state of the bonnet 38 and opens the contact at the initial stage of the stroke for rotating the bonnet 38, the solenoid valve 64 is switched to the closed state at that time. It has been replaced. As a result, since the operation of the work operation lever 65 is invalidated before the work operation lever 65 hits the second connecting portion 72, it is possible to prevent the work device 13 and the like from moving.

  The work of closing the opened hood 38 may be performed in the reverse manner. The operator first closes the bonnet 38. For this reason, the console 52 is in the second posture P2 over the entire stroke for rotating the bonnet 38. Therefore, even if the work operation lever 65 is touched, the work device 13 moves. There is nothing. Immediately before the bonnet 38 is completely closed, the bonnet switch 75 detects the closed state of the bonnet 38 and closes the contact. After closing the hood 38, the operator switches the left and right consoles 52 from the second posture P2 to the first posture P1. In this process, the left and right console switches 76 detect the first posture P1 and close the contacts. As a result, the operation of the work operation lever 65 is validated by the electromagnetic valve 64.

  Thus, in the turning work vehicle 1 of the present embodiment, even when the hood 38 is opened and the engine 33 is operating, the operation of the work operation lever 65 is invalidated. Does not turn or work device 13 does not operate. Therefore, maintenance work can be performed with peace of mind.

  Further, the bonnet 38 cannot be opened and closed unless the console 52 is in the second posture P2 by the second connecting portion 72 of the safety frame 66. Therefore, the operator can be surely followed the procedure for opening and closing the bonnet 38.

  Moreover, the 2nd connection part 72 has the shape bent so that it might become the front, as it approaches the connection location (namely, edge part of right-and-left both sides) from the longitudinal direction intermediate part to the support | pillar 70. Therefore, since the arrangement | positioning of the 2nd connection part 72 which the operator sitting on the driver's seat 39 does not become cramped can be implement | achieved, habitability can be ensured.

  As described above, the turning work vehicle 1 of this embodiment includes the bonnet 38, the console 52, the electromagnetic valve 64, and the safety frame 66. The bonnet 38 is supported so as to be rotatable about a rotating shaft 45c disposed behind the engine 33, covers the engine 33, and can be opened and closed. The console 52 has a work operation lever 65 that is operated by an operator, is rotatably supported with respect to the bonnet 38, and rotates in the same direction as the rotation direction of opening the bonnet 38, so that the first posture P1 to the second posture. It can be switched to P2, and can be switched from the second posture P2 to the first posture P1 by rotating in the opposite direction. The solenoid valve 64 enables the operation of the work operation lever 65 when the console 52 is in the first posture P1 and the bonnet 38 is closed, and disables the operation of the work operation lever 65 otherwise. And The safety frame 66 prevents the bonnet 38 from being opened and closed when the console 52 is in the first posture P1, and allows the bonnet 38 to be opened and closed when the console 52 is in the second posture P2.

  Thereby, it is possible to open the bonnet 38 in the state which made the console 52 the 2nd attitude | position P2, and maintenance of the engine 33 etc. can be performed in connection with this. When the hood 38 is in the open state or when the console 52 is in the second posture P2, the operation of the work operation lever 65 is invalidated by the electromagnetic valve 64. Therefore, for example, when performing maintenance of the hydraulic circuit by opening the hood 38 while the engine 33 is in operation, even if the work operation lever 65 is unexpectedly touched, an operation corresponding to the operation is performed. Can be prevented. Further, the safety frame 66 can ensure that the console 52 is in the second posture P2 when the bonnet 38 is opened and closed. Therefore, the operation of the turning work vehicle 1 caused by touching the work operation lever 65 when the bonnet 38 is opened and closed can be reliably prevented.

  Further, the turning work vehicle 1 of the present embodiment includes a driver seat 39. The safety frame 66 includes a support post 70 and a second connecting portion 72. The struts 70 are arranged in a pair at intervals in the width direction of the driver seat 39. The 2nd connection part 72 connects the support | pillar 70 mutually. A virtual circle centered on the rotation center (rotation shaft 45c) of the bonnet 38 is defined as a first virtual circle with the radius of the distance between the rotation center of the bonnet 38 (hinge shaft 61) and the tip of the operation lever 65 in the first posture P1. Let C1. A distance between the rotation shaft 45c and the tip of the work operation lever 65 in the second posture P2 is a radius, and a virtual circle centered on the rotation shaft 45c is a second virtual circle C2. At this time, all of the 2nd connection part 72 is arrange | positioned inside 1st virtual circle C1. All of the 2nd connection part 72 is arrange | positioned outside the 2nd virtual circle C2.

  Thereby, when the console 52 is in the first posture P <b> 1, the rotation of the bonnet 38 is prevented by the work operation lever 65 hitting the second connecting portion 72. Therefore, it is possible to reliably prevent the bonnet 38 from opening and closing when the console 52 is in the first posture P1.

  In the present embodiment, a virtual circle centered on the hinge shaft 61 with the distance between the rotation center of the console 52 (hinge shaft 61) and the tip of the work operation lever 65 as a radius and the hood 38 closed is formed. Let it be a third virtual circle C3. At this time, the 2nd connection part 72 is arrange | positioned outside the 3rd virtual circle C3.

  Accordingly, when the hood 38 is closed, the second connecting portion 72 does not get in the way when the posture of the console 52 is switched, so that a series of operations for opening and closing the hood 38 can be performed smoothly.

  Further, in the turning work vehicle 1 of the present embodiment, the second connecting portion 72 is formed so as to become forward as it approaches the connection portion from the middle portion in the longitudinal direction to the support column 70.

  Thereby, a space can be secured around the operator sitting on the driver's seat 39, and comfort can be improved.

  The preferred embodiment of the present invention has been described above, but the above configuration can be modified as follows, for example.

  It is not necessary that all of the second connecting portions 72 are arranged inside the first virtual circle C1, and only a part of the second connecting portions 72 may be arranged inside the first virtual circle C1.

  As a configuration for detecting the opening / closing of the bonnet 38, various sensors such as an optical sensor and a potentiometer can be used instead of the bonnet switch 75, for example. As a configuration for detecting the attitude of the console 52, various other sensors can be used instead of the console switch 76.

  A controller including a computer may be provided, and the controller may detect the opening / closing of the bonnet switch 75 and the console switch 76 with a sensor and control the opening / closing of the electromagnetic valve 64.

  The safety frame 66 may further be provided with a canopy.

  The console 52 may be provided only on either the left or right side instead of the left and right pair.

  The present invention can be applied not only to a turning work vehicle but also to work vehicles having various other configurations and uses.

1 Turning work vehicle (work vehicle)
33 Engine 38 Bonnet 39 Driver's seat 45c Rotating shaft (bonnet rotation center)
52 Console 61 Hinge axis (center of rotation of console)
64 Solenoid valve (locking part)
65 Work control lever (control lever)
66 Safety frame (safety device)
70 support column 72 second connecting portion (regulating portion)
C1 first virtual circle C2 second virtual circle C3 third virtual circle

Claims (4)

An openable / closable bonnet that is supported rotatably about a rotating shaft disposed behind the engine and covers the engine;
It has an operation lever operated by an operator, is rotatably supported with respect to the bonnet, and can be switched from the first posture to the second posture by rotating in the same direction as the rotation direction of opening the bonnet, A console capable of switching from the second posture to the first posture by rotating in the direction of
A lock portion that enables the operation of the operation lever when the console is in the first posture and the bonnet is closed; otherwise, the operation lever is disabled.
A safety device that prevents opening and closing of the bonnet when the console is in the first posture, and allows opening and closing of the bonnet when the console is in the second posture;
A work vehicle comprising: The work vehicle according to claim 1,
Equipped with a driver's seat,
The safety device is
A pair of struts spaced apart in the width direction of the driver seat;
A restricting portion for connecting the columns to each other;
With
A distance between the rotation center of the bonnet and the tip of the operation lever in the first posture is a radius, and a virtual circle centered on the rotation center of the bonnet is a first virtual circle,
When the distance between the rotation center of the bonnet and the tip of the operation lever in the second posture is a radius, and a virtual circle centered on the rotation center of the bonnet is a second virtual circle,
At least a part of the restricting portion is disposed inside the first virtual circle;
The work vehicle, wherein all of the restriction portions are arranged outside the second virtual circle. The work vehicle according to claim 2,
When the distance between the rotation center of the console and the tip of the operation lever is a radius, and a virtual circle centered on the rotation center of the console in a state where the bonnet is closed is a third virtual circle,
The work vehicle characterized in that the restricting portion is disposed outside the third virtual circle. The work vehicle according to claim 2 or 3,
The work vehicle characterized in that the restricting portion is formed so as to be forward as it approaches a connection portion from the middle portion in the longitudinal direction to the support column.

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