KR102482320B1 - Work vehicle - Google Patents

Abstract

The turning work vehicle is provided with a locking mechanism 70 . The lock mechanism 70 includes a hydraulic cylinder, a transmission part 72 and a lock plate 78 . The transmission unit 72 transmits the driving force generated by the hydraulic cylinder. The thickness direction of the lock plate 78 is parallel to the longitudinal direction of the traveling control lever 36 in neutral. The lock plate 78 is rotated in a direction parallel to the longitudinal direction of the travel control lever 36 when it is in neutral by the driving force transmitted by the transmission part 72 as a rotation center, and thus the first concave portion 78e and the second concave portion 78e are rotated. The lock position in which the hardness of the travel control lever 36 in the front-rear direction is regulated by the two travel control levers 36 entering the two concave portions 78f, respectively, and the first concave portion 78e and the second concave portion ( 78f), the position can be switched between release positions where the two travel control levers 36 are respectively out of position.

Description

Work vehicle {WORK VEHICLE}

The present invention mainly relates to a work vehicle provided with a locking mechanism for locking a travel control lever.

Conventionally, in a work vehicle configured to direct travel by tilting a travel control lever, a configuration including a locking mechanism that locks the travel control lever by regulating the hardness of the travel control lever is known. Patent Literatures 1 and 2 disclose this type of work vehicle.

The travel working machine of Patent Literature 1 includes two travel control levers and a fixing mechanism. The two travel control levers are formed upright on a base in front of the driver's seat. An operation member that rotates integrally with the travel control lever is formed at a base of the two travel control levers. An engaging pin is formed on the operating member. The fixing mechanism includes a fixing piece that can move in a straight line. An engaging concave portion is formed in the fixing piece, and the traveling control lever is locked by linearly moving the fixing piece and engaging the locking pin in the engaging concave portion.

The small hydraulic excavator of Patent Document 2 includes two travel control levers and a travel lock device. The two travel control levers are rotatable, respectively, with two tubular parts arranged below the floor where the driver's seat is formed as rotational axes. A protruding portion protruding from the tubular portion (ie, near the base of the travel control lever) is formed. The traveling 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 linearly. When the lock plate moves in a straight line, the protruding portion of the cylinder is inserted into the groove of the lock plate, and the travel control lever is locked.

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

In Patent Literatures 1 and 2, the movement of a separate member formed near the base of the travel control lever is restricted to lock the travel control lever. Therefore, since it is necessary to arrange a fixing mechanism or a travel lock device near the base of the travel control lever, the degree of freedom in design is reduced.

Further, in Patent Literatures 1 and 2, it is described that a fixing mechanism and a traveling lock device can be arranged in a space-saving manner. However, in Patent Literatures 1 and 2, only configurations in which the fixing piece and the lock plate are moved linearly are disclosed, and configurations for realizing space-saving configurations by other methods are not described.

The present invention has been made in view of the above circumstances, and its main object is to provide a configuration of a lock mechanism that has a high degree of freedom in design and can be installed in a space-saving manner in a work vehicle having a lock mechanism for locking a travel control lever. is in doing

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

According to the viewpoint of the present invention, a work vehicle having the following configuration is provided. That is, this work vehicle includes a traveling body, two travel control levers, and a locking mechanism. The travel control lever instructs travel of the travel body by tilting it in the front-rear direction. The locking mechanism is capable of regulating the longitudinal inclination of the two travel control levers. The lock mechanism includes a drive unit, a transmission unit, and a lock plate. The drive unit generates a driving force. The transmitting unit transmits the driving force generated by the driving unit. The lock plate is a plate-like member, has a thickness direction parallel to the longitudinal direction of the travel control lever when it is neutral, and has a first concave portion and a second concave portion. The lock plate is rotated in a direction parallel to the longitudinal direction of the travel control lever when it is neutral by the driving force transmitted by the transmission unit as a rotation center, so that the two travels are performed by the first concave portion and the second concave portion. Switching the position between a lock position where the longitudinal hardness of the travel control lever is regulated by retracting the control lever, and a release position where the two travel control levers are respectively deviated from the first concave portion and the second concave portion. It is possible.

In this way, since the range in which the lock mechanism can be attached is widened by restricting the travel control lever itself, not the separate member attached to the base of the travel control lever, the degree of freedom in design can be improved. Further, since a separate member attached to the travel control lever becomes unnecessary, the structure can be simplified. In addition, the thickness direction of the lock plate is parallel to the longitudinal direction when the travel control lever is in neutral, and the rotational locus of the lock plate can be reduced by rotating the lock plate with the longitudinal direction as the center of rotation. Therefore, the space required to form the locking mechanism can be reduced.

In the above work vehicle, it is preferable to set it as the following structure. That is, the drive unit has a movable unit, and the movable unit generates a driving force when the movable unit moves linearly. The transmission part converts the linear motion of the movable part into a rotational motion with a rotational center being a direction parallel to the longitudinal direction of the travel control lever when it is in neutral, and rotates the lock plate. A direction in which the movable portion moves linearly is parallel to a longitudinal direction of the driving control lever when it is neutral.

As a result, since the direction in which the movable part moves linearly is parallel to both the longitudinal direction of the travel control lever when it is in neutral and the rotation center of the lock plate, it is necessary to simplify the structure of the transmission part or reduce the size of the transmission part. it becomes possible

In the above work vehicle, it is preferable to set it as the following structure. That is, the work vehicle includes a work operation lever and a console box. The work control levers are disposed on the left and right sides of the driver's seat, and can operate at least the work device. The operation control lever is attached to the console box, and is rotatable integrally with the operation operation lever with the left and right directions as the center of rotation. At the timing when the work control lever and the console box start to rotate backward from the normal posture for performing work with the work device, the locking mechanism starts regulating the hardness of the two travel control levers.

Thereby, the travel control lever can be locked at the timing (early timing) when the work control lever and the console box are started to rotate backward. In addition, since the configuration in which the work control lever and the console box are integrally rotated rearward is often employed in small work vehicles, the effect of the present invention in that space can be saved and the lock mechanism can be arranged is more effectively exhibited. can make it

In the above work vehicle, it is preferable to set it as the following structure. That is, this work vehicle includes a driver's seat and a floor. The driver's seat is for an operator to sit on. The floor is for an operator seated in a driver's seat to rest his legs. The work vehicle is equipped with a control box. The control box is formed to protrude upward from a portion of the floor in front of the driver's seat, and a direction change valve unit composed of a plurality of direction change valves capable of changing the delivery direction of hydraulic oil is disposed therein. The two travel control levers are formed on the control box. The lock mechanism is arranged inside the control box.

Since the directional control valve unit is disposed inside the control box, the space in the control box is easily limited, so the effect of the present invention that the lock mechanism can be arranged in a space-saving manner can be exhibited more effectively. Further, since the configuration including the control box in front of the driver's seat is mainly employed in small work vehicles, the effect of the present invention can be exhibited more effectively in this respect as well.

1 is a perspective view showing the overall configuration of a turning work vehicle according to an embodiment of the present invention.
2 is a side view of the turning working vehicle.
Fig. 3 is a perspective view showing the configuration of a locking mechanism;
Fig. 4 is a side view showing a change in the position of each member when the locking mechanism releases the lock of the travel control lever.
Fig. 5 is a plan view showing a change in the position of each member when the locking mechanism releases the lock of the travel control lever.

Next, embodiments of the present invention will be described with reference to the drawings. 1 is a perspective view showing the overall configuration of a turning working vehicle 1 according to an embodiment of the present invention. 2 : is a side view of the turning work vehicle 1. As shown in FIG.

A swing working vehicle (work vehicle) 1 of the present embodiment shown in FIGS. 1 and 2 includes a lower traveling body (traveling body) 11 and an upper swing body 12 .

The undercarriage 11 includes crawler traveling devices 21 disposed in pairs on the left and right, and a hydraulic motor (not shown) that drives the crawler traveling devices 21. The undercarriage 11 can individually drive the left and right crawler traveling devices 21 in various directions and at various speeds to perform various types of travel such as forward or backward straight movement 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 steering unit 35. .

The revolving frame 31 is disposed above the undercarriage 11 and supported by the undercarriage 11 so as to be rotatable about an axis perpendicular to a horizontal plane. The swing frame 31 can rotate with respect to the undercarriage 11 by driving an unillustrated swing motor. The bonnet 32 is arranged at the rear of the revolving frame 31, and the engine 33 is arranged therein. The engine 33 is configured as a diesel engine, for example. The hydraulic pump unit 34 is driven by the engine 33 and generates hydraulic power necessary for traveling and working of the swing work vehicle 1 .

The work device 13 includes a boom 41 , an arm 42 , a bucket 43 , and a blade (clay plate) 44 . Hydraulic cylinders are connected to the boom 41, the arm 42, the bucket 43, and the blade 44, respectively. By expanding and contracting these hydraulic cylinders with the hydraulic force generated by the hydraulic pump unit 34, the boom 41 and the arm 42 are rotated to change positions, excavation with the bucket 43, etc. operation, or rotating the blade 44 up and down.

The control unit 35 includes various operation members arranged around the driver's seat 39 for the operator to sit on. The operation members are mainly arranged in the control box 50 and the console box 60 . In the following description, in a state where the lower traveling body 11 and the upper swing body 12 are aligned in front, the front and rear directions are defined in the direction viewed from the operator seated in the driver's seat 39.

The control box 50 is in front of the driver's seat 39 and is formed so that an operator seated in the driver's seat 39 stands upward from the floor 25 on which the operator sits. In the control box 50, a travel control lever 36 for instructing the running of the turning work vehicle 1 and a blade control lever 37 for instructing the raising and lowering of the blade 44 are formed.

The travel control lever 36 is formed so as to extend upward from the control box 50 (in detail, obliquely upward on the rear side). The travel control levers 36 are arranged as a pair on the left and right, and by operating the travel control lever 36 on the left side, an instruction can be given to the crawler traveling device 21 on the left side, and the travel control lever 36 on the right side can be operated. By operating, an instruction can be given to the crawler traveling device 21 on the right side. In addition, by tilting the travel control lever 36 forward, the crawler travel device 21 can be driven in the forward direction, and by tilting the travel control lever 36 backward, the crawler travel device 21 can be driven in the backward direction. and the crawler travel device 21 can be stopped by placing the travel control lever 36 in the neutral position.

Moreover, as shown in FIG. 2, inside the control box 50, the direction selector valve unit 38 is arrange|positioned. The directional selector valve unit 38 includes a plurality of directional selector valves for switching between driving/stopping of hydraulic actuators included in the swing work vehicle 1 and the like. The directional selector valve includes a spool, and when the spool is displaced by operation of the operating member, the crawler traveling device 21, the swing motor, the work device 13, and the like are driven.

The console box 60 is arranged as a pair on the left and right so as to sandwich the driver's seat 39 therebetween. The driver's seat 39 and the console box 60 are disposed on the upper surface of the bonnet 32 of the upper swing structure 12 . The left and right console boxes 60 are configured symmetrically with each other, and the configurations are substantially the same. The left and right console boxes 60 are provided with an operation lever 61 and a lock lever 62, respectively.

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

The operator on the turning work vehicle 1 operates the work control lever 61 with the console box 60 in a normal posture. On the other hand, when an operator goes up and down on the turning work vehicle 1, it can be retracted so that it may not interfere with an operator's body by making console box 60 into a retracted posture.

When the console box 60 is in a normal posture, the work control lever 61 is formed so as to extend upward from the upper part of the console box 60 (in detail, obliquely upward in the front side). The operation control lever 61 is a lever for instructing turning of the upper swing structure 12 and driving of the boom 41 , arm 42 , and bucket 43 .

The lock lever 62 is formed so as to extend obliquely upward from the front of the console box 60 when the console box 60 is in a normal posture. The rotation of the console box 60 is regulated by a regulating mechanism not shown in the normal posture and the retracted posture. By rotating the lock lever 62, the restriction of the regulating mechanism is released, and the console box 60 can be rotated.

In addition, a contact sensor and a contact member (not shown) are provided in the console box 60, and the contact member contacts the contact sensor when the console box 60 is in a normal posture. Also, at the timing when the console box 60 in the normal posture is started to rotate backward, the contact member separates from the contact sensor. When the contact member is not in contact with the contact sensor, since the supply of hydraulic oil based on the operation of the work control lever 61 is cut off by closing a solenoid valve or the like not shown, operation of the work control lever 61 It becomes invalid. In addition, when the locking mechanism 70 described below operates, the travel control lever 36 is locked.

Next, with reference to FIGS. 3-5, the locking mechanism 70 for locking the work control lever 61 is demonstrated. 3 is a perspective view showing the configuration of the locking mechanism 70 . 4 and 5 are a side view and a plan view showing a change in position of each member when the locking mechanism 70 unlocks the travel control lever 36 . In addition, in the following description, expressions describing directions such as parallel or perpendicular refer not only to configurations in which the literal state is strictly established, but also to configurations in which, for example, a difference of several degrees occurs (approximately parallel or approximately vertical) is also included.

As shown in FIG. 3, the inclined surface 52 is formed in the upper part and rear part of the control box 50. As shown in FIG. The inclined surface 52 is a surface inclined so as to approach upward as it approaches the front. On the inclined surface 52, a notification lamp for notifying a battery failure or the like, a counter for displaying a total working time, and the like are formed. Moreover, two lever insertion holes 53 are formed side by side in the left-right direction at the center of the left-right direction of the inclined surface 52 . The two travel control levers 36 are inserted into these two lever insertion holes 53, respectively. Therefore, the travel control lever 36 is arranged so as to penetrate the exterior member (casing) of the control box 50 .

Inside the control box 50, a rotating shaft portion 91 and a plurality of rotating cylinder portions 92 are disposed. The rotating shaft portion 91 is an elongated cylindrical member, and is arranged so that its axial direction (longitudinal direction) is parallel to the left-right direction. The rotating tube portion 92 is a cylindrical member mounted so as to be relatively rotatable with respect to the rotating shaft portion 91 . A plurality of rotary cylinders 92 are arranged side by side in the axial direction of the rotary shaft 91 . In addition, the two travel control levers 36 are welded to different rotary tube parts 92, respectively. As a result, when the travel control lever 36 is operated, only the corresponding rotary cylinder 92 rotates. A power transmission member (not shown) is attached to the rotating cylinder portion 92, and the spool is displaced by transmitting power accompanying rotation of the rotating cylinder portion 92 to the direction change valve unit 38.

As shown in FIG. 3 and the like, the travel control lever 36 is curved inside the control box 50, but the part occupying most of the travel control lever 36 (the part outside the control box 50) straight line Therefore, when referring to "the longitudinal direction of the travel control lever 36" or the like, it means the longitudinal direction of the portion that occupies most of the travel control lever 36 (the portion outside the control box 50). do. In the following description, the longitudinal direction of the travel control lever 36 when the travel control lever 36 is in neutral (a state in which the crawler traveling device 21 is instructed to stop) is referred to as the "lever length direction". call Also, as described above, the lever longitudinal direction is inclined with respect to the vertical direction, but among one side in the lever longitudinal direction, the side closer to the upper side may be referred to as "the upper side in the lever longitudinal direction" or the like.

The locking mechanism 70 is a mechanism for locking the travel control lever 36 (making it impossible to operate by the travel control lever 36) by regulating the hardness of the travel control lever 36 in the longitudinal direction. to be. 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 . In addition, each part constituting the locking mechanism 70 is supported by the stay 80 . The stay 80 includes a cylinder support portion 81 for supporting the hydraulic cylinder 71, a frame mounting portion 82 attached to a frame constituting the control box 50, a first rotation shaft 75 described later, and a second It is provided with a rotation shaft support part 83 which supports the two rotation shafts 79.

The hydraulic cylinder 71 is a driving unit that generates a driving force by supplying hydraulic fluid from one end through the hydraulic hose 93 . The hydraulic cylinder 71 is an elongated member, and includes a body portion 71a and a movable portion 71b. The longitudinal directions of the body portion 71a and the movable portion 71b are parallel to the lever longitudinal direction. The movable part 71b is formed at the other end (top end in the longitudinal direction of the lever) of the body part 71a. The movable part 71b is configured to be linearly movable in the lever longitudinal direction with respect to the body part 71a.

In addition, a spring (elastic support member) not shown is formed in the hydraulic cylinder 71, and in a state where hydraulic oil is not supplied to the hydraulic cylinder 71, the elastic force of the spring causes the body portion 71a to move the lever length. located on the lower side of the By supplying hydraulic oil to the hydraulic cylinder 71, the movable part 71b is pressed with a force stronger than the elastic force of the spring and moves upward in the lever longitudinal direction. Further, while the contact member is in contact with the contact sensor of the console box 60, hydraulic oil is supplied to the hydraulic cylinder 71. On the other hand, when the contact member is separated 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 (the linear motion of the movable unit 71b in the lever longitudinal direction) to rotate the lock plate 78 with the lever longitudinal direction as the center of rotation. As shown in FIG. 3 , the transmission unit 72 includes a link arm 73, a link plate 74, a first rotary shaft 75, a ball joint 76, and a rotary plate 77.

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

The link plate 74 is arranged so that the thickness direction becomes parallel to the left-right direction. The link plate 74 is rotatably supported by the rotation shaft support 83 with the first rotation shaft 75 as a rotation shaft (with the left and right directions as the center of rotation). 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 rotatable to the rear end (the other end) of the link plate 74. it is fitted

By the above structure, as shown in FIG. 4, when operating oil is supplied to the hydraulic cylinder 71 and the movable part 71b linearly moves upward in the lever longitudinal direction, the link plate 74 rotates. As a result, the ball joint 76 attached to the link plate 74 moves substantially forward in a straight line.

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

Rotating plate 77 is arranged so that its thickness direction is parallel to the lever longitudinal direction. The rotary plate 77 is supported by the rotary shaft support part 83 so as to be rotatable with the second rotary shaft 79 as a rotary shaft (with the lever longitudinal direction as the rotation center). Since the lock plate 78 is fixed to the rotary plate 77, the rotary plate 77 and the lock plate 78 rotate integrally.

Since the rotation plate 77 and the lock plate 78 rotate in the same plane because the thickness direction and the center of rotation are parallel, the rotation locus becomes small. Also, since the rotation center and the lever longitudinal direction are parallel, the lock plate 78 is brought closer to the travel control lever 36 in approximately the shortest distance, so the rotational locus also becomes small in this respect. Accordingly, a space-saving locking mechanism 70 can be realized. In addition, since the directional control valve unit 38 is disposed in the control box 50 and hydraulic oil is supplied from the directional control valve unit 38 to the hydraulic cylinder 71, the hydraulic hose 93 can be shortened. .

The lock plate 78 is provided with a first arm 78a and a second arm 78b extending away from the second rotation shaft 79 . Moreover, the space between the 1st arm 78a and the 2nd arm 78b is called the space|gap 78c. Moreover, although the lock plate 78 of this embodiment has the connection part 78d which connects the 1st arm 78a and the 2nd arm 78b, the 1st arm 78a and the 2nd arm 78b This separate member may be sufficient.

The travel control lever 36 on the left is located in the gap 78c between the first arm 78a and the second arm 78b. In addition, the travel control lever 36 on the right side is located on the right side of the second arm 78b. 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 travel control lever 36 side), a first concave portion 78e 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 outer side of the lock plate 78, the right side of the travel control lever 36 side), the second concave portion ( 78f) is formed.

As shown in Fig. 5, when the ball joint 76 moves linearly, the rear end of the ball joint 76, the rotary plate 77, and the lock plate 78 are integrally rotated in the longitudinal direction of the lever as the center of rotation. can be rotated With this, the lock plate 78 can be rotated between the locked position and the unlocked position. Further, the lock plate 78 is switched from the locked position to the unlocked position by rotating clockwise as viewed from the top.

Specifically, when hydraulic oil is not being supplied to the hydraulic cylinder 71, the lock plate 78 is located at the locked position. When the lock plate 78 is in the locked position, the travel control lever 36 enters the first concave portion 78e and the second concave portion 78f, so that the hardness of the travel control lever 36 in the front-rear direction increases. regulated Therefore, the travel control lever 36 can be locked, for example, when an operator ascends or descends.

On the other hand, when hydraulic oil is being supplied to the hydraulic cylinder 71, the lock plate 78 is located in the release position. When the lock plate 78 is in the release position, the travel control lever 36 is located outside the first concave portion 78e and the second concave portion 78f. The travel control lever 36 on the left side can be tilted in the front-rear direction by the gap 78c. Therefore, the length of the space 78c in the front-rear direction is determined so as not to contact the lock plate 78 even when the travel control lever 36 is tilted most forward. Also, since the travel control lever 36 on the right side does not overlap with the lock plate 78 in the left-right direction, it can tilt in the front-rear direction.

As explained above, the turning working vehicle 1 of this embodiment is provided with the undercarriage 11, two travel control levers 36, and the locking mechanism 70. The travel control lever 36 instructs the travel of the lower travel body 11 by tilting it in the front-rear direction. The locking mechanism 70 is capable of regulating the hardness of the two travel control levers 36 in the front-rear direction. The locking mechanism 70 includes a hydraulic cylinder 71, a transmission part 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-like member, and its thickness direction is parallel to the longitudinal direction of the travel control lever 36 when it is neutral, and a first concave portion 78e and a second concave portion 78f are formed therein. . The lock plate 78 is rotated in a direction parallel to the longitudinal direction of the travel control lever 36 when it is in neutral by the driving force transmitted by the transmission part 72 as a rotation center, and thus the first concave portion 78e and the second concave portion 78e are rotated. The lock position in which the hardness of the travel control lever 36 in the front-rear direction is regulated by the two travel control levers 36 entering the two concave portions 78f, respectively, and the first concave portion 78e and the second concave portion ( 78f), the position can be switched between release positions where the two travel control levers 36 are respectively out of position.

As a result, the range in which the locking mechanism 70 can be mounted is widened by restricting the travel control lever 36 itself, rather than a separate member attached to the base of the travel control lever 36, so the degree of freedom in design is improved. can make it Further, since a separate member attached to the travel control lever 36 is not required, the structure can be simplified. In addition, the thickness direction of the lock plate 78 and the longitudinal direction of the traveling control lever 36 in neutral are parallel, and the rotational locus of the lock plate 78 can be reduced by rotating the longitudinal direction with this longitudinal direction as the center of rotation. there is. Therefore, the space required to form the locking mechanism 70 can be reduced.

In addition, in the turning work vehicle 1 of the present embodiment, the hydraulic cylinder 71 has a movable part 71b, and the movable part 71b generates a driving force when the movable part 71b moves linearly. The transmission part 72 converts the linear motion of the movable part 71b into a rotational motion with the direction parallel to the longitudinal direction of the traveling control lever 36 in neutral as a rotation center, and rotates the lock plate 78. . The direction in which the movable part 71b moves linearly is parallel to the longitudinal direction of the travel control lever 36 when it is in neutral.

As a result, since the direction in which the movable part 71b moves linearly is parallel to both the longitudinal direction of the travel control lever 36 in neutral and the rotational center of the lock plate 78, the configuration of the transmission part 72 can be improved. It becomes possible to simplify or to reduce the size of the delivery unit 72.

Moreover, the turning work vehicle 1 of this embodiment is provided with the work control lever 61 and the console box 60. The work control levers 61 are disposed on the left and right sides of the driver's seat 39, respectively, and can operate at least the work device 13. An operation control lever 61 is attached to the console box 60, and is rotatable integrally with the operation operation lever 61 with the left and right directions as the center of rotation. At the timing when the work control lever 61 and the console box 60 start to rotate backward from the normal posture for performing work by the work device 13, the two travel control levers by the lock mechanism 70 The regulation of the hardness of (36) is disclosed.

Thereby, the travel control lever 36 can be locked at the timing (early timing) when the work control lever 61 and the console box 60 are started to rotate backward. In addition, since the configuration in which the work control lever 61 and the console box 60 are integrally rotated backward is often employed in the small-sized swing work vehicle 1 as in the present embodiment, space is saved and locking is performed. The effect of the present invention that the mechanism 70 can be disposed can be exhibited more effectively.

Moreover, in the turning working vehicle 1 of this embodiment, it is set as the following structure. That is, this turning work vehicle 1 includes a driver's seat 39 and a floor. The driver's seat 39 is for an operator to sit on. The floor is for the operator seated in the driver's seat 39 to rest his feet. The turning working vehicle 1 includes a control box 50 . The control box 50 is formed to protrude upward from a portion of the floor in front of the driver's seat 39, and is composed of a plurality of directional control valves capable of switching the delivery direction of hydraulic oil. placed inside this Two travel control levers 36 are formed in the control box 50 . A locking mechanism 70 is disposed inside the control box 50 .

Since the directional control valve unit 38 is disposed inside the control box 50, the space within the control box 50 is easily limited, so the effect of the present invention that the lock mechanism 70 can be disposed by saving space can be exhibited more effectively. In addition, since the configuration provided with the control box 50 in front of the driver's seat 39 is often employed in the small-sized turning work vehicle 1 like this embodiment, the effect of the present invention also in this respect. can be exhibited more effectively.

Although preferred embodiment of this invention was described above, the said structure can be changed as follows, for example.

The direction in which the lock plate 78 is rotated to unlock the travel control 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 may not be parallel to the lever longitudinal direction, and may be perpendicular to the lever longitudinal direction, for example.

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

In the above embodiment, the hydraulic cylinder 71 has been described as an example as the driving unit of the locking mechanism, but a driving unit having a different configuration may be used. For example, it may be a cylinder that generates a driving force by supplying a fluid (such as air) other than hydraulic oil, or a driving unit (such as a solenoid) that generates a driving force depending on the presence or absence of an electric signal or current.

In the above embodiment, an example in which the present invention is applied to a swing work vehicle (hydraulic excavator) has been described, but if it has a configuration such as instructing travel with two travel control levers, other work vehicles (for example, civil engineering and The present invention can also be applied to construction machines that perform works such as construction.

1: Slewing work vehicle (work vehicle)
11: lower running body (running body)
12: upper revolving body
36: travel control lever
50: control box
60: console box
70: lock mechanism
71: hydraulic cylinder (drive unit)
72: delivery unit
78: lock plate

Claims (3)

A traveling body, two travel control levers for instructing travel of the traveling body by tilting in the longitudinal direction, and a lock mechanism capable of regulating the longitudinal tilt of the two travel control levers, the lock mechanism comprising: When the two travel control levers are in a neutral position, the control position and release position can be switched by rotating a direction parallel to a longitudinal direction of the travel control levers in neutral as a rotation center. According to claim 1,
The work vehicle according to claim 1 , wherein the locking mechanism includes a drive unit that generates a driving force, and a transmission unit that transmits the driving force generated by the drive unit, and the drive unit is disposed parallel to the travel control lever. According to claim 2,
The work vehicle according to claim 1 , wherein the driving unit generates a driving force in a linear direction, and the transmission unit converts the driving force in a linear direction into a rotational force with a rotational center being a direction parallel to a longitudinal direction of the travel control lever when it is in neutral.

Images