JP2020190188A - Work vehicle - Google Patents

Abstract

To provide a configuration of a lock mechanism installable in a limited space with high degree of freedom for a working vehicle provided with the lock mechanism locking the control lever for traveling.SOLUTION: A revolving work vehicle is provided with a lock mechanism 70. The lock mechanism 70 is provided with a hydraulic cylinder, a transfer section 72, and a lock plate 78. The transfer section 72 transfers driving force generated by the hydraulic cylinder. A depthwise direction of the lock plate 78 is parallel to a longitudinal direction of a control lever 36 for traveling at a neutral position. A lock plate 78 rotates around a direction parallel to a longitudinal direction of the control lever 36 for traveling at the neutral position by driving force transferred by the transfer section 72, which makes two control levers for traveling 36 to enter a first concave part 78e and a second concave part 78f respectively to position the control lever 36 for traveling at a lock position where a longitudinal tilting is limited and to position the two control levers 36 for traveling at an unlock position where each of those is disengaged with the first concave part 78e and the second concave part 78f respectively.SELECTED DRAWING: Figure 5

Description

The present invention mainly relates to a work vehicle provided with a lock mechanism for locking a traveling operation lever.

Conventionally, in a work vehicle having a configuration in which a traveling operation lever is tilted to instruct traveling, a configuration including a lock mechanism for locking the traveling operation lever by restricting the tilting of the traveling operation lever has been known. Patent Documents 1 and 2 disclose this type of work vehicle.

The traveling work machine of Patent Document 1 includes two traveling operation levers and a fixing mechanism. The two traveling operation levers are erected on the machine stand in front of the driver's seat. The bases of the two traveling operation levers are provided with operating members that rotate integrally with the traveling operation levers. A locking pin is formed on the operating member. The fixing mechanism includes a fixing piece that can move linearly. An engaging recess is formed in the fixing piece, and the traveling operation lever is locked by moving the fixing piece in a straight line and locking the locking pin in the engaging recess.

The small hydraulic excavator of Patent Document 2 includes two traveling operation levers and a traveling lock device. The two traveling operation levers can rotate about two cylinders arranged below the floor on which the driver's seat is provided as rotation axes. A protruding portion protruding from the tubular portion is formed in the tubular portion (that is, in the vicinity of the base portion of the traveling operation lever). The travel lock device includes a lock plate and a hydraulic cylinder. The lock plate is arranged so as to be orthogonal to the floor. A plurality of grooves are formed in the lock plate. The hydraulic cylinder moves the lock plate in a straight line. When the lock plate moves linearly, the protruding portion of the tubular portion is inserted into the groove of the lock plate, and the traveling operation lever is locked.

Japanese Unexamined Patent Publication No. 8-284212 JP-A-2016-141934

Patent Documents 1 and 2 have a configuration in which the traveling operation lever is locked by restricting the movement of another member provided in the vicinity of the base portion of the traveling operation lever. Therefore, it is necessary to dispose a fixing mechanism or a traveling lock device in the vicinity of the base of the traveling operation lever, which reduces the degree of freedom in design.

Further, Patent Documents 1 and 2 describe that the fixing mechanism and the traveling lock device can be arranged in a space-saving manner. However, Patent Documents 1 and 2 only disclose a configuration in which the fixing piece and the lock plate are linearly moved, and do not describe a configuration in which a space-saving configuration is realized by other methods.

The present invention has been made in view of the above circumstances, and a main object thereof is a lock mechanism which has a high degree of freedom in design and can be installed in a space-saving manner in a work vehicle provided with a lock mechanism for locking a traveling operation lever. Is to provide the configuration of.

Means and effects to solve problems

The problem to be solved by the present invention is as described above, and next, the means for solving this problem and its effect will be described.

From the viewpoint of the present invention, a work vehicle having the following configuration is provided. That is, this work vehicle can regulate the tilting of the traveling body, the two traveling operation levers that instruct the traveling of the traveling body by tilting in the front-rear direction, and the two traveling operation levers in the front-rear direction. A locking mechanism is provided, and the locking mechanism can switch between a regulated position and a released position by rotating in the horizontal direction when the two traveling operation levers are in the neutral position.

As a result, by restricting the travel operation lever itself instead of another member attached to the base of the travel operation lever, the range in which the lock mechanism can be attached is widened, so that the degree of freedom in design can be improved. Further, since a separate member attached to the traveling operation lever is not required, the structure can be simplified. Further, by rotating in the horizontal direction, the rotation locus of the lock plate can be reduced. Therefore, the space required to provide the lock mechanism can be reduced.

The perspective view which shows the overall structure of the turning work vehicle which concerns on one Embodiment of this invention. Side view of a turning work vehicle. The perspective view which shows the structure of the lock mechanism. The side view which shows the change of the position of each member when the lock mechanism unlocks a traveling operation lever. The plan view which shows the change of the position of each member when the lock mechanism unlocks a traveling operation lever.

Next, an embodiment 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 side view of the turning work vehicle 1.

The turning work vehicle (working vehicle) 1 of the present embodiment shown in FIGS. 1 and 2 includes a lower traveling body (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, and a hydraulic motor (not shown) for driving the crawler traveling device 21. The lower traveling body 11 can individually drive the left and right crawler traveling devices 21 in various directions and speeds to perform various traveling such as straight forward or backward traveling and steering.

The upper swing body 12 includes a swing frame 31, a bonnet 32, an engine 33, a hydraulic pump unit 34, a working device 13, and a control unit 35.

The swivel frame 31 is arranged above the lower traveling body 11 and is rotatably supported by the lower traveling body 11 about an axis perpendicular to the horizontal plane. The swivel frame 31 can be rotated with respect to the lower traveling body 11 by driving a swivel motor (not shown). The bonnet 32 is arranged at the rear of the swivel frame 31, and the engine 33 is arranged inside. The engine 33 is configured as, for example, a diesel engine. The hydraulic pump unit 34 is driven by the engine 33 to generate the hydraulic pressure required for traveling and working of the turning work vehicle 1.

The working device 13 includes a boom 41, an arm 42, a bucket 43, and a blade (soil removal plate) 44. A hydraulic cylinder is connected to each of the boom 41, the arm 42, the bucket 43, and the blade 44. By expanding and contracting these hydraulic cylinders with the hydraulic pressure generated by the hydraulic pump unit 34, the boom 41 and arm 42 can be rotated to change their positions, excavation by the bucket 43, and the like can be performed. The 44 can be rotated up and down.

The control unit 35 includes various operating members arranged around the driver's seat 39 for the operator to sit on. The operating members are mainly arranged in the control box 50 and the console box 60. In the following description, front / rear / left / right are defined in the direction viewed from the operator seated in the driver's seat 39 with the fronts of the lower traveling body 11 and the upper turning body 12 aligned.

The control box 50 is provided in front of the driver's seat 39 so that the operator seated in the driver's seat 39 stands up from the floor 25 on which the foot is placed. The control box 50 is provided with a traveling operation lever 36 for instructing the traveling of the turning work vehicle 1, a blade operating lever 37 for instructing the raising and lowering of the blade 44, and the like.

The traveling operation lever 36 is provided so as to extend upward (specifically, diagonally upward rearward) from the control box 50. The traveling operation levers 36 are arranged in pairs on the left and right, and instructions can be given to the crawler traveling device 21 on the left side by operating the traveling operation lever 36 on the left side, and by operating the traveling operation lever 36 on the right side. Instructions can be given to the crawler traveling device 21 on the right side. Further, the crawler traveling device 21 can be driven in the forward direction by tilting the traveling operation lever 36 forward, and the crawler traveling device 21 can be driven in the backward direction by tilting the traveling operation lever 36 backward. The crawler traveling device 21 can be stopped by positioning the traveling operation lever 36 in the neutral position.

Further, as shown in FIG. 2, a direction switching valve unit 38 is arranged inside the control box 50. The directional control valve unit 38 includes a plurality of directional switching valves for switching the drive / stop of the hydraulic actuator included in the turning work vehicle 1 and the like. The directional control valve is configured to include a spool, and the spool is displaced according to the operation of the operating member to drive the crawler traveling device 21, the swivel motor, the working device 13, and the like.

The console boxes 60 are arranged in pairs on the left and right so as to sandwich the driver's seat 39. The driver's seat 39 and the console box 60 are arranged on the upper surface of the bonnet 32 included in the upper swing body 12. The left and right console boxes 60 have a symmetrical configuration, and the configurations are substantially the same. The left and right console boxes 60 are provided with a work operation lever 61 and a lock lever 62, respectively.

The console box 60 is rotatably supported with a rotation center in the left-right direction with respect to a bracket (not shown) fixed to the upper surface of the bonnet 32. Further, since the work operation lever 61 and the lock lever 62 are attached to the console box 60, the work operation lever 61 and the lock lever 62 also rotate integrally with the console box 60. Thereby, as shown by the two-dot chain line in FIG. 2, the posture of the console box 60 can be changed between the normal posture shown by the solid line and the retracted posture shown by the two-dot chain line.

The operator riding on the turning work vehicle 1 operates the work operation lever 61 with the console box 60 in the normal posture. On the other hand, when the operator gets on and off the turning work vehicle 1, the console box 60 can be retracted so as not to interfere with the operator's body.

The work operation lever 61 is provided so as to extend upward (specifically, diagonally forward and upward) from the upper part of the console box 60 when the console box 60 is in the normal posture. The work operation lever 61 is a lever for instructing the rotation of the upper swing body 12 and the driving of the boom 41, the arm 42, and the bucket 43.

The lock lever 62 is provided so as to extend diagonally upward from the front portion of the console box 60 when the console box 60 is in the normal posture. The rotation of the console box 60 is regulated by the regulation mechanism shown in the figure in the normal posture and the retracted posture. By rotating the lock lever 62, the regulation of the regulation mechanism can be released and the console box 60 can be rotated.

Further, the console box 60 is provided with a contact sensor and a contact member (not shown), and when the console box 60 is in the normal posture, the contact member comes into contact with the contact sensor. Further, the contact member separates from the contact sensor at the timing when the console box 60 in the normal posture starts to rotate backward. When the contact member is not in contact with the contact sensor, the solenoid valve and the like shown in the figure are closed, and the supply of hydraulic oil based on the operation of the work operation lever 61 is cut off, so that the operation of the work operation lever 61 is invalid. It becomes. Further, the traveling operation lever 36 is locked by the operation of the lock mechanism 70 described below.

Next, the lock mechanism 70 for locking the work operation lever 61 will be described with reference to FIGS. 3 to 5. FIG. 3 is a perspective view showing the configuration of the lock mechanism 70. 4 and 5 are side views and plan views showing changes in the position of each member when the lock mechanism 70 unlocks the traveling operation lever 36. Further, in the following description, the expression for explaining the direction such as parallel or vertical is not only a configuration in which the literal state is strictly established, but also a configuration in which a difference of about several degrees occurs (approximately parallel or vertical). Approximately vertical) is also included.

As shown in FIG. 3, an inclined surface 52 is formed on the upper part and the rear part of the control box 50. The inclined surface 52 is a surface that is inclined so as to approach upward as it approaches the front. The inclined surface 52 is provided with a notification lamp for notifying an abnormality of the battery and a counter for displaying the cumulative working time. Further, two lever insertion holes 53 are formed in the center of the inclined surface 52 in the left-right direction so as to be arranged in the left-right direction. The two traveling operation levers 36 are inserted into these two lever insertion holes 53, respectively. Therefore, the traveling operation lever 36 is arranged so as to penetrate the exterior member (housing) of the control box 50.

Inside the control box 50, a rotary shaft portion 91 and a plurality of rotary cylinder portions 92 are arranged. The rotating shaft portion 91 is an elongated columnar member, and is arranged so that the axial direction (longitudinal direction) is parallel to the left-right direction. The rotary cylinder portion 92 is a tubular member that is rotatably attached to the rotary shaft portion 91. A plurality of rotary cylinder portions 92 are arranged side by side in the axial direction of the rotary shaft portion 91. Further, the two traveling operation levers 36 are welded to different rotary cylinder portions 92. As a result, when the traveling operation lever 36 is operated, only the corresponding rotary cylinder portion 92 rotates. A power transmission member (not shown) is attached to the rotary cylinder portion 92, and the spool is displaced by transmitting the power accompanying the rotation of the rotary cylinder portion 92 to the direction switching valve unit 38.

As shown in FIG. 3 and the like, the traveling operation lever 36 is curved inside the control box 50, but the portion occupying most of the travel operation lever 36 (the portion outside the control box 50) is linear. .. Therefore, when the term "longitudinal direction of the traveling operation lever 36" or the like is used, it means the longitudinal direction of a portion (a portion outside the control box 50) that occupies most of the traveling operation lever 36. Further, in the following description, the longitudinal direction of the traveling operating lever 36 when the traveling operating lever 36 is in the neutral position (a state in which the crawler traveling device 21 is instructed to stop) is referred to as a “lever longitudinal direction”. Further, although the lever longitudinal direction is inclined with respect to the vertical direction as described above, the one closer to the upper side of the lever longitudinal direction may be referred to as "upper side in the lever longitudinal direction" or the like.

The lock mechanism 70 is a mechanism for locking the travel operation lever 36 (making it impossible to operate by the travel operation lever 36) by restricting the tilt of the travel operation lever 36 in the front-rear direction. As shown in FIG. 3, the lock mechanism 70 includes a hydraulic cylinder (drive unit) 71, a transmission unit 72, and a lock plate 78. Further, each part constituting the lock mechanism 70 is supported by the stay 80. The stay 80 includes a cylinder support portion 81 that supports the hydraulic cylinder 71, a frame mounting portion 82 that is attached to the frame that constitutes the control box 50, and a rotary shaft that supports the first rotary shaft 75 and the second rotary shaft 79, which will be described later. A support portion 83 is provided.

The hydraulic cylinder 71 is a drive unit that generates a driving force by supplying hydraulic oil from one end via a hydraulic hose 93. The hydraulic cylinder 71 is an elongated member, and includes a main body portion 71a and a movable portion 71b. The longitudinal direction of the main body portion 71a and the movable portion 71b is parallel to the longitudinal direction of the lever. The movable portion 71b is provided at the other end of the main body 71a (the upper end in the longitudinal direction of the lever). The movable portion 71b is configured to be movable linearly with respect to the main body portion 71a in the longitudinal direction of the lever.

Further, the hydraulic cylinder 71 is provided with a spring (biasing member) (not shown), and when hydraulic oil is not supplied to the hydraulic cylinder 71, the main body 71a is lowered in the lever longitudinal direction by the urging force of the spring. Located on the side. When the hydraulic oil is supplied to the hydraulic cylinder 71, the movable portion 71b is pressed by a force stronger than the urging force of the spring and moves upward in the longitudinal direction of the lever. The hydraulic oil is supplied to the hydraulic cylinder 71 while the contact member is in contact with the contact sensor of the console box 60. On the other hand, when the contact member separates from the contact sensor of the console box 60 (that is, at the timing when the console box 60 starts to rotate backward from the normal posture), the supply of hydraulic oil is stopped.

The transmission unit 72 transmits the driving force generated by the hydraulic cylinder 71 (linear motion of the movable unit 71b in the longitudinal direction of the lever) to rotate the lock plate 78 about the longitudinal direction of the lever. As shown in FIG. 3, the transmission unit 72 includes a link arm 73, a link plate 74, a first rotating shaft 75, a ball joint 76, and a rotating plate 77.

The link arm 73 is fixed to the movable portion 71b and is configured to move integrally with the movable portion 71b. The longitudinal direction of the link arm 73 is parallel to the longitudinal direction of the lever. One end of the link arm 73 (lower end in the longitudinal direction of the lever) is fixed to the movable portion 71b, and the other end of the link arm 73 (upper end in the longitudinal direction of the lever) is rotatably attached to the link plate 74. There is.

The link plate 74 is arranged so that the thickness direction is parallel to the left-right direction. The link plate 74 is rotatably supported by the rotation shaft support portion 83 with the first rotation shaft 75 as the rotation axis (with the left-right direction as the rotation center). As described above, the link arm 73 is rotatably attached to the front end (one end) of the link plate 74, and the ball joint 76 is rotatably attached to the rear end (the other end) of the link plate 74. Has been done.

With the above configuration, as shown in FIG. 4, the link plate 74 rotates when the hydraulic oil is supplied to the hydraulic cylinder 71 and the movable portion 71b linearly moves upward in the longitudinal direction of the lever. As a result, the ball joint 76 attached to the link plate 74 moves linearly forward substantially.

Further, as described above, the ball joint 76 is attached to the link plate 74 so as to be rotatable around the left-right direction as the center of rotation at the rear end portion (one end portion). Further, the ball joint 76 is rotatably attached to the rotating plate 77 at the front end portion (one end portion) with the lever longitudinal direction as the center of rotation. With this configuration, the ball joint 76 can transmit power between two members (link plate 74 and rotating plate 77) having different directions of rotation axes.

The rotating plate 77 is arranged so that the thickness direction is parallel to the longitudinal direction of the lever. The rotary plate 77 is rotatably supported by the rotary shaft support portion 83 with the second rotary shaft 79 as the rotary shaft (with the lever longitudinal direction as the rotation center). Since the lock plate 78 is fixed to the rotating plate 77, the rotating plate 77 and the lock plate 78 rotate integrally.

Since the rotation plate 77 and the lock plate 78 are parallel to each other in the thickness direction and the center of rotation, they rotate in the same plane, so that the rotation locus becomes small. Further, since the center of rotation and the longitudinal direction of the lever are parallel to each other, the lock plate 78 approaches the traveling operation lever 36 at a substantially shortest distance, and thus the rotation locus becomes small also at this point. Therefore, the space-saving lock mechanism 70 can be realized. Further, since the direction switching valve unit 38 is arranged in the control box 50 and the hydraulic oil is supplied from the direction switching valve unit 38 to the hydraulic cylinder 71, the hydraulic hose 93 can be shortened.

The lock plate 78 is formed with a first arm 78a and a second arm 78b extending away from the second rotation shaft 79. The space between the first arm 78a and the second arm 78b is referred to as a gap 78c. Further, although the lock plate 78 of the present embodiment has a connecting portion 78d for connecting the first arm 78a and the second arm 78b, the first arm 78a and the second arm 78b may be separate members. ..

The traveling operation lever 36 on the left side is located in the gap 78c between the first arm 78a and the second arm 78b. Further, the traveling operation lever 36 on the right side is located on the right side of the second arm 78b. A first recess 78e is formed on the right side of the first arm 78a (the second arm 78b side, the gap 78c side, the inside of the lock plate 78, and the left side of the traveling operation lever 36 side). A second recess 78f is formed on the right side of the second arm 78b (the opposite side of the first arm 78a, the opposite side of the gap 78c, the outside of the lock plate 78, and the right side of the traveling operation lever 36).

As shown in FIG. 5, the linear motion of the ball joint 76 allows the rear end portion of the ball joint 76, the rotating plate 77, and the lock plate 78 to be integrally rotated with the lever longitudinal direction as the center of rotation. .. As a result, the lock plate 78 can be rotated between the lock position and the release position. Further, the lock plate 78 is switched from the lock position to the release position by rotating clockwise in the top view.

Specifically, when hydraulic oil is not supplied to the hydraulic cylinder 71, the lock plate 78 is located at the lock position. When the lock plate 78 is in the locked position, the traveling operation lever 36 is inserted into the first recess 78e and the second recess 78f, so that the traveling operation lever 36 is restricted from tilting in the front-rear direction. Therefore, for example, the traveling operation lever 36 can be locked when the operator gets on and off.

On the other hand, when hydraulic oil is supplied to the hydraulic cylinder 71, the lock plate 78 is located at the release position. When the lock plate 78 is in the release position, the traveling operation lever 36 is located outside the first recess 78e and the second recess 78f. The traveling operation lever 36 on the left side can be tilted in the front-rear direction by the gap 78c. Therefore, the length of the gap 78c is determined in the front-rear direction so as not to come into contact with the lock plate 78 even when the traveling operation lever 36 is tilted to the frontmost side. Further, since the position of the traveling operation lever 36 on the right side does not overlap with the lock plate 78 in the left-right direction, the traveling operation lever 36 can be tilted in the front-rear direction.

As described above, the turning work vehicle 1 of the present embodiment includes a lower traveling body 11, two traveling operation levers 36, and a lock mechanism 70. The travel operation lever 36 is tilted in the front-rear direction to instruct the lower traveling body 11 to travel. The lock mechanism 70 can regulate the tilting of the two traveling operation levers 36 in the front-rear direction. The lock mechanism 70 includes a hydraulic cylinder 71, a transmission unit 72, and a lock plate 78. The hydraulic cylinder 71 generates a driving force. The transmission unit 72 transmits the driving force generated by the hydraulic cylinder 71. The lock plate 78 is a plate-shaped member, the thickness direction of which is parallel to the longitudinal direction of the traveling operation lever 36 when neutral, and a first recess 78e and a second recess 78f are formed. The lock plate 78 rotates about the direction parallel to the longitudinal direction when the traveling operation lever 36 is neutral by the driving force transmitted by the transmission unit 72, so that the lock plate 78 has two in the first recess 78e and the second recess 78f. A lock position in which tilting of the travel operation lever 36 in the front-rear direction is restricted by entering the travel operation lever 36, and a release position in which the two travel operation levers 36 are released from the first recess 78e and the second recess 78f, respectively. The position can be switched between.

As a result, by regulating the traveling operation lever 36 itself instead of another member attached to the base of the traveling operation lever 36, the range in which the lock mechanism 70 can be attached is widened, so that the degree of freedom in design can be improved. it can. Further, since a separate member attached to the traveling operation lever 36 is not required, the structure can be simplified. Further, the thickness direction of the lock plate 78 and the longitudinal direction of the traveling operation lever 36 at the time of neutralization are parallel, and the rotation locus of the lock plate 78 can be reduced by rotating the lock plate 78 with the longitudinal direction as the center of rotation. Therefore, the space required to provide the lock mechanism 70 can be reduced.

Further, in the turning work vehicle 1 of the present embodiment, the hydraulic cylinder 71 has a movable portion 71b, and the movable portion 71b moves linearly to generate a driving force. The transmission unit 72 converts the linear motion of the movable portion 71b into a rotational motion centered on the direction parallel to the longitudinal direction when the traveling operation lever 36 is neutral to rotate the lock plate 78. The direction in which the movable portion 71b moves linearly and the longitudinal direction when the traveling operation lever 36 is in the neutral position are parallel.

As a result, the direction in which the movable portion 71b moves linearly becomes parallel to both the longitudinal direction when the traveling operation lever 36 is in the neutral position and the rotation center of the lock plate 78. It is possible to reduce the size of 72.

Further, the turning work vehicle 1 of the present embodiment includes a work operation lever 61 and a console box 60. The work operation levers 61 are arranged on the left and right sides of the driver's seat 39, respectively, and can operate at least the work device 13. A work operation lever 61 is attached to the console box 60, and can rotate integrally with the work operation lever 61 with the rotation center in the left-right direction. At the timing when the work operation lever 61 and the console box 60 start rotating backward from the normal posture in which the work device 13 works, the lock mechanism 70 starts the regulation of tilting of the two travel operation levers 36.

As a result, the traveling operation lever 36 can be locked at the timing (early timing) when the work operation lever 61 and the console box 60 start to rotate backward. Further, since the configuration in which the work operation lever 61 and the console box 60 are integrally rotated backward is often adopted in the small turning work vehicle 1 as in the present embodiment, the lock mechanism 70 can be arranged in a space-saving manner. The effect of the present invention can be more effectively exhibited.

Further, the turning work vehicle 1 of the present embodiment has the following configuration. That is, the turning work vehicle 1 includes a driver's seat 39 and a floor. The driver's seat 39 is for the operator to sit on. The floor is for the operator seated in the driver's seat 39 to put his foot on it. The turning work vehicle 1 includes a control box 50. The control box 50 is provided so as to project upward from a portion of the floor located in front of the driver's seat 39, and is a direction switching valve unit 38 composed of a plurality of direction switching valves capable of switching the delivery direction of hydraulic oil. Is placed inside. The two traveling operation levers 36 are provided in the control box 50. The lock mechanism 70 is arranged inside the control box 50.

Since the direction switching valve unit 38 is arranged inside the control box 50, the space inside the control box 50 is likely to be limited, so that the effect of the present invention that the lock mechanism 70 can be arranged in a space-saving manner can be more effectively exhibited. be able to. Further, since the configuration in which the control box 50 is provided in front of the driver's seat 39 is often adopted in the small turning work vehicle 1 as in the present embodiment, the effect of the present invention is more effectively exhibited in this respect as well. Can be made to.

Although the preferred embodiment of the present invention has been described above, the above configuration can be changed as follows, for example.

The direction in which the lock plate 78 is rotated to unlock the traveling operation lever 36 may be opposite to that of the above embodiment (counterclockwise when viewed from above). Further, the direction of the force generated by the hydraulic cylinder 71 does not have to be parallel to the longitudinal direction of the lever, and may be perpendicular to, for example, the longitudinal direction of the lever.

In the above embodiment, the console box 60 is rotated rearward integrally with the work operation lever 61 to invalidate the instruction to the work device 13 or the like by the work operation lever 61. Instead of this, a configuration may be provided in which another lever for invalidating the instruction to the work device or the like by the work operation lever 61 is provided (a configuration in which the console box 60 is not rotated when the operator gets on and off).

In the above embodiment, the hydraulic cylinder 71 has been described as an example of the drive unit of the lock mechanism, but a drive unit having another configuration can also be used. For example, it may be a cylinder that generates a driving force by supplying a fluid (air, etc.) other than hydraulic oil, or a driving unit (solenoid, etc.) that generates a driving force according to the presence or absence of an electric signal or an electric current. ) May be.

In the above embodiment, an example in which the present invention is applied to a turning work vehicle (hydraulic excavator) has been described, but if it has a configuration such as instructing travel with two travel operation levers, another work vehicle ( For example, the present invention can be applied to a construction machine that performs work such as civil engineering and construction.

1 Turning work vehicle (working vehicle) 11 Lower traveling body (traveling body) 12 Upper rotating body 36 Driving operation lever 50 Control box 60 Console box 70 Lock mechanism 71 Hydraulic cylinder (drive unit) 72 Transmission unit 78 Lock plate

Claims (3)

It is equipped with a traveling body, two traveling operation levers that instruct the traveling body to travel by tilting in the front-rear direction, and a lock mechanism that can regulate the tilting of the two traveling operation levers in the front-rear direction. The lock mechanism is a work vehicle characterized in that when the two traveling operation levers are in the neutral position, the restricted position and the released position can be switched by rotating in the horizontal direction. The lock mechanism includes a driving unit that generates a driving force and a transmitting unit that transmits the driving force generated by the driving unit, and the driving unit is arranged so as to be parallel to the traveling lever. The work vehicle according to claim 1, wherein the work vehicle is provided. The work vehicle according to claim 2, wherein the driving unit generates a driving force in a linear direction, and the transmitting unit converts the driving force in the linear direction into the rotational force in the horizontal direction.