JP2020104728A - Work vehicle - Google Patents

Abstract

To provide a work vehicle capable of improving operation ability when releasing a lock state of a mirror, and allowing a user to perform release operation in a stable posture.SOLUTION: There is provided a wheel loader 1 in which a mirror 40 for confirming a rear side of a vehicle is attached to each of left and right sides of a cab 31, the wheel loader comprises: a movement device 6 which can move each mirror 40 between a use position X and a storage position Y; a lock device 7 for locking each mirror 40 at the use position X and the storage position Y. The lock device 7 comprises a block body 73 comprising a recess 73B with which a spring pin 72 is engaged, the spring pin being provided so as to cross a lock pin 71 being rotated around an axis and moving in a vertical direction. The recess 73B is formed of first to fourth small recesses 731A-731D, and first and second large recesses 732A, 732B, the first and second large recesses 732A, 732B comprise: first to fourth inclined planes 734A-734D with which the spring pin 72 is brought into slide contact.SELECTED DRAWING: Figure 4

Description

The present invention relates to a work vehicle provided with a mirror for an operator to check the rear of a vehicle body.

Even in work vehicles such as wheel loaders and hydraulic excavators, the visibility behind the vehicle body is ensured by mirrors provided on the left and right sides of the driver's cab, as in general passenger vehicles. For example, in Patent Document 1, a stay having a base end side rotatably attached to a front side portion of a driver's cab and a mirror main body attached to a tip end of the stay are provided, and the mirror main body is provided on the driver's cab side. A hydraulic excavator equipped with a rear-view mirror configured to be switchable between a use position in which the mirror body is viewed toward the rear of the vehicle body and a storage position in which the mirror body and stay are stored within the vehicle width of the vehicle body by protruding toward one side Is disclosed.

This rear-view mirror has an arm plate projecting from the outer circumference on the base end side of the stay, a lock pin that is planted on the arm plate at a predetermined distance from the outer peripheral surface of the stay, and a pivot center on the base end side of the stay. And a plate member provided with a plurality of fitted portions into which the lock pin is fitted along an arc corresponding to the rotation locus of the lock pin. The lock mechanism locks the stay by fixing the stay to the vehicle body by fitting the lock pin to one of the fitted parts at the use position or the storage position, and pulling up the stay together with the mirror body by the required amount. By releasing the pin from the fitted portion, the locked state is released and the stay can be rotated.

JP 2006-298171 A

However, in the rearview mirror described in Patent Document 1, an operator or a worker needs to pull up a heavy stay to which the mirror body is attached by a required amount when releasing the locked state, so that the releasing operation can be performed with one hand. It is difficult, and it is easy to lose posture when releasing.

Therefore, an object of the present invention is to provide a work vehicle in which the operability in releasing the locked state of the mirror is improved and an operator or a worker can perform the releasing operation in a stable posture.

In order to achieve the above object, the present invention provides a work vehicle in which mirrors for confirming the rear of a vehicle body are attached to the left and right sides of a driver's cab via attachment members. A moving device that allows the mirror to move between a use position that is extended toward the storage position and a storage position that is closer to the cab than the use position; and the use position and the storage position that are provided in the mounting member. And a lock device for locking each of the mirrors, the moving device is formed by bending a rod-shaped member, and has a mirror stay to which the mirror is attached and a thickness in a vertical direction of the vehicle body. And a plate-shaped member to which the end portion of the mirror stay is fixed, and a through-hole formed in the plate-shaped member and penetrating in the thickness direction, and the plate-shaped member with respect to the mounting member. A rotation shaft member that is rotatably attached and serves as a rotation center of the mirror stay, and the locking device is arranged with a shaft in the vertical direction of the vehicle body and operates in the axial direction while rotating. A shaft member; a pin member extending from the outer periphery of the shaft member in a direction intersecting the axial direction; and a block member into which the shaft member is inserted and the pin member is locked, The plate-shaped member includes a first fitting portion to which one end portion of the shaft body fits at the use position and a second fitting portion to which the one end portion of the shaft body fits at the storage position. When the block body is recessed in the axial direction of the shaft body and the one end portion of the shaft body is disengaged from the first fitting portion or the second fitting portion, A small recess in which the pin member is locked and a recess that is larger in the axial direction of the shaft than the small recess, and the one end of the shaft is the first fitting part or the second fitting part. And a large concave portion to which the pin member is locked when the pin body is engaged with the large concave portion, the large concave portion is inclined toward the small concave portion when the shaft body operates. In, an inclined surface with which the pin member slides is formed.

According to the present invention, the operability when releasing the locked state of the mirror is improved, and the operator or the worker can perform the releasing operation in a stable posture. Problems, configurations, and effects other than those described above will be clarified by the following description of the embodiments.

It is an appearance side view showing an example of 1 composition of a wheel loader concerning an embodiment of the present invention. It is a perspective view showing an example of 1 composition of an operator's cab. It is a figure which shows the use position and storage position of a mirror. It is a transparent perspective view which expands and shows the upper bracket periphery in a mirror unit. It is a perspective view which shows the structure of the plate of a moving device. It is an exploded perspective view showing composition of a lock pin of a lock device, a spring pin, and a knob, respectively. It is a perspective view which shows the structure of the block body of a locking device. It is a transparent side view explaining the structure of the lock device in a locked state. It is a transparent side view explaining the structure of the lock device in an unlocked state.

Hereinafter, as one mode of the work vehicle according to the embodiment of the present invention, for example, a wheel loader for excavating earth and sand or the like in an open pit mine and loading the dump truck or the like will be described.

(Overall configuration of wheel loader 1)
First, the overall configuration of the wheel loader 1 will be described with reference to FIG.

FIG. 1 is an external side view showing a configuration example of a wheel loader 1 according to an embodiment of the present invention.

In the following description, of the left-right direction of the vehicle body of the wheel loader 1, the left-hand direction when the operator who is on the wheel loader 1 faces forward is referred to as “left direction”, and the right-hand direction is referred to as “right direction”. .. Further, in the following description, the case where “the left and right direction of the vehicle body” is simply referred to as “the left and right direction”, “the front and rear direction of the vehicle body” is simply referred to as “the front and rear direction”, and “the vertical direction of the vehicle body” is simply referred to as the “up and down direction” There is.

The wheel loader 1 is an articulated work vehicle that is steered by center-folding the vehicle body near the center, and includes a front frame 101 that forms the front portion of the vehicle body and a rear frame 102 that forms the rear portion of the vehicle body. I have it. The front frame 101 and the rear frame 102 are connected by a center joint 103 so as to be rotatable in the left-right direction, and the front frame 101 is bent in the left-right direction with respect to the rear frame 102.

The front frame 101 is provided with a pair of left and right front wheels 101A (only the left side is shown in FIG. 1) and a working machine 2 for carrying out cargo handling work.

The working machine 2 includes a lift arm 21 whose base end is rotatably attached to the front frame 1A, a pair of lift arm cylinders (not shown) for driving the lift arm 21, and a lift arm 21 which is mounted on the tip end of the lift arm 21. A bucket 22 that is movably attached, a bucket cylinder 220 that drives the bucket 22, a bell crank 23 that is rotatably connected to the lift arm 21 and that forms a link mechanism between the bucket 22 and the bucket cylinder 220, and a pair. A plurality of pipes (not shown) for guiding hydraulic oil to the lift arm cylinder and the bucket cylinder 220.

The lift arm 21 rotates upward with respect to the front frame 101 as hydraulic oil flows into each bottom chamber of the pair of lift arm cylinders and each rod extends, and hydraulic oil flows into each rod chamber. As each rod contracts, it rotates downward with respect to the front frame 101.

The bucket 22 is a work tool for scooping earth and sand and releasing the soil, and leveling the ground. When the hydraulic oil flows into the bottom chamber of the bucket cylinder 220 and the rod 220A extends, a tilt (lift arm) is generated. 21) and hydraulic oil flows into the rod chamber and the rod 220A contracts to dump (rotate downward with respect to the lift arm 21).

In the rear frame 102, a pair of left and right rear wheels 102A (only the left side is shown in FIG. 1), a driver's cab 31 in which an operator rides, and a machine room 32 in which various devices such as an engine and a hydraulic pump are housed. A counter weight 33 is provided to maintain the balance with the work implement 2 so that the vehicle body does not tilt. In the rear frame 102, the cab 31 is arranged in the front part, the counterweight 33 is arranged in the rear part, and the machine room 32 is arranged between the cab 31 and the counterweight 33.

(Configuration of cab 31)
Next, the configuration of the cab 31 will be described with reference to FIGS. 2 and 3.

FIG. 2 is a perspective view showing a configuration example of the cab 31. FIG. 3 is a diagram showing a use position X and a storage position Y of the mirror 40.

The cab 31 includes a floor plate portion 311 mounted on the rear frame 102, a ceiling portion 312 that covers the floor plate portion 311 from above, and a plurality of pillars 313 that vertically extend between the floor plate portion 311 and the ceiling portion 312. , And has a frame structure, and a space (room) is formed inside.

In the present embodiment, the plurality of pillars 313 are composed of four pillars arranged in the front, rear, left, and right of the cab 31. In the following description, of the front, rear, left and right pillars 313, the front left and right are referred to as “front pillars 313A”, and the rear left and right are referred to as “rear pillars 313B”. 2 and 3, of the front, rear, left and right pillars 313, only the left front pillar 313A and the rear pillar 313B are shown. A front window 314 is provided between the left and right front pillars 313A so as to project toward the work machine 2, and a rear window 315 is provided between the left and right rear pillars 313B so as to project toward the machine room 32. As shown in FIG. 2, a front wiper 314A is provided on the front glass portion of the front window 314, and a rear wiper 315A is provided on the rear glass portion of the rear window 315 as shown in FIG.

An opening/closing door 316 for allowing an operator or a worker to access the inside of the operator's cab 31 is provided between the left front pillar 313A and the rear pillar 313B. In the present embodiment, the left side opening/closing door 316 is openable/closable, and an operator or the like gets into the cab 31 from the left side opening/closing door 316. However, depending on the specifications of the wheel loader 1, the right side opening/closing door 316 may be opened. It may be opened and closed. 2 and 3, only the left opening/closing door 316 of the left and right opening/closing doors 316 is shown.

Further, handrails 317 formed by bending a rod-shaped member such as a pipe are attached to the front, rear, left, and right pillars 313 along the extending direction. 2 and 3, only the handrail 317 attached to the left front pillar 313A and the rear pillar 313B is shown.

As shown in FIG. 2, mirror units 4 including mirrors 40 for checking the rear of the vehicle body are provided on the left and right sides of the cab 31, respectively. Since the left and right mirror units 4 have the same configuration, the left mirror unit 4 will be described below as an example.

(Structure of mirror unit 4)
Next, the configuration of the mirror unit 4 will be described with reference to FIGS.

FIG. 4 is a transparent perspective view showing the vicinity of the upper bracket 5A in the mirror unit 4 in an enlarged manner. FIG. 5 is a perspective view showing the configuration of the plate 62A of the moving device 6. FIG. 6 is an exploded perspective view showing configurations of the lock pin 71, the spring pin 72, and the knob 74 of the lock device 7, respectively. FIG. 7 is a perspective view showing a configuration of the block body 73 of the lock device 7.

As shown in FIGS. 2 and 3, the mirror unit 4 includes a mirror 40, a pair of brackets 5</b>A and 5</b>B as attachment members for attaching to the cab 31, and a use position X and a storage position Y of the mirror 40. It is configured to include a moving device 6 that can move between the two, and a locking device 7 that locks the mirror 40 at each of the use position X and the storage position Y.

Here, the “use position X” of the mirror 40 is a position which projects outward in the left-right direction of the operator's cab 31 as indicated by a broken line in FIG. 3, and the mirror 40 is arranged at this use position X. The mirror surface is facing backward in the opened state. Further, the “storage position Y” of the mirror 40 is a position closer to the driver's cab 31 side than the use position X, and the mirror 40 has the mirror surface facing the driver's cab 31 side in the state of being arranged in the storage position Y. Is within the vehicle width.

The pair of brackets 5A and 5B are provided side by side in the extending direction (vertical direction of the cab 31) above the handrail 317 of the left front pillar 313A. Among the pair of brackets 5A and 5B, the one provided on the upper side is referred to as "upper bracket 5A" and the one provided on the lower side is referred to as "lower bracket 5B".

In this embodiment, as shown in FIGS. 2 and 3, the lock device 7 is provided on the upper bracket 5A. Therefore, in the following, the configuration of the mirror unit 4 on the upper bracket 5A side will be mainly described.

As shown in FIG. 4, the upper bracket 5A has a fixed plate portion 51 fixed to the left front pillar 313A with a bolt 510, and a rectangular parallelepiped main body portion 52 protruding from the fixed plate portion 51. A first insertion hole 521 and a second insertion hole 522 penetrating in the up-down direction are formed in the main body portion 52 side by side in the left-right direction (shown by broken lines in FIG. 4 ). The first insertion hole 521 is arranged on the fixed plate portion 51 side in the left-right direction. On the other hand, unlike the upper bracket 5A, the lower bracket 5B does not have the second insertion hole 522, but the other configurations are the same as the upper bracket 5A.

As shown in FIGS. 2 and 3, the moving device 6 includes a mirror stay 61 formed by bending a rod-shaped member having a circular cross section, such as a pipe, and an upper plate arranged corresponding to the upper bracket 5A. 62A, a lower plate 62B arranged corresponding to the lower bracket 5B, an upper rod 63 (see FIG. 4) for rotatably attaching the upper plate 62A to the upper bracket 5A, and a lower plate 62B. A lower rod (not shown) rotatably attached to the lower bracket 5B.

The mirror stay 61 extends in the up-down direction and has a mounted portion 611 on which the mirror 40 is mounted, and an upper extending portion 612 that extends from an upper end portion of the mounted portion 611 and has a front end portion fixed to the upper plate 62A. And a lower extension portion 613 which extends from the lower end portion of the mounted portion 611 and whose front end portion is fixed to the lower plate 62B.

The upper plate 62A and the lower plate 62B each correspond to a plate-shaped member having a thickness in the vertical direction. As shown in FIG. 5, the upper plate 62A is a fan-shaped metal plate, and has a through hole 620 penetrating in the thickness direction, and a first fitting portion 621 and a second fitting which are recesses recessed in the thickness direction. And a portion 622 are formed.

In the upper plate 62A, the through hole 620 is arranged on the center side of the fan shape, and the first fitting portion 621 and the second fitting portion 622 are arranged on the arc side of the fan shape. At this time, when the through hole 620, the first fitting portion 621, and the second fitting portion 622 are viewed from the arc side of the upper plate 62A, the through hole 620 includes the first fitting portion 621 and the second fitting portion 622. It is located between

As shown in FIG. 4, the upper plate 62A is disposed above the main body 52 of the upper bracket 5A so that the first fitting portion 621 and the second fitting portion 622 are recessed upward. On the other hand, the lower plate 62B is different from the upper plate 62A in that the first fitting portion 621 and the second fitting portion 622 are not formed and only the through hole 620 is formed.

The upper rod 63 has an axis in the vertical direction, and is inserted into the through hole 620 of the upper plate 62A and the first insertion hole 521 of the main body portion 52 from above, and the washer 631 is interposed below the main body portion 52. It is fixed by a self-lock nut 632. The washer 631 and the self-lock nut 632 are covered with a cover member 633.

Although not shown in FIG. 4, the upper end of the upper rod 63 is larger than the outer diameter of the through hole 620 of the upper plate 62A (see FIGS. 8 and 9), and the self-lock nut 632 is loose. In this case, the rod 63 is prevented from falling off.

Here, the upper plate 62A rotates horizontally with the upper rod 63 as the center of rotation, and the lower plate 62B also horizontally rotates with the lower rod as the center of rotation. As a result, the mirror stay 61 whose ends are fixed to the upper plate 62A and the lower plate 62B also horizontally rotates about the upper rod 63 and the lower rod as rotation centers, and the mirror stay 61 is mounted on the mirror stay 61. The 40 can move between the use position X and the storage position Y. That is, the upper rod 63 and the lower rod correspond to the rotating shaft member that is the rotation center of the mirror stay 61.

In the present embodiment, when the upper plate 62A rotates about the upper rod 63 as the center of rotation, the first side surface 623A along the alignment direction of the through hole 620 and the first fitting portion 621, the through hole 620, and the second hole 620 The second side surfaces 623B along the alignment direction with the fitting portion 622 abut on the fixed plate portion 51 of the upper bracket 5A and play a role of stoppers, so that the upper plate 62A is rotated clockwise or counterclockwise. Also does not rotate 360° (one lap). Note that FIG. 4 shows a state in which the second side surface 623B is in contact with the fixed plate portion 51.

The configuration of the lower bracket 5B, the lower plate 62B, and the lower rod is particularly limited as long as the lower plate 62B is rotatably attached to the lower bracket 5B with the lower rod as the center of rotation. There is no.

As shown in FIG. 4, the lock device 7 includes a lock pin 71 as a shaft body having a shaft in the vertical direction, a spring member 710 provided on the outer periphery of the lock pin 71, and a lock pin 71. In order to rotate the lock pin 71, a spring pin 72 as a pin member extending from the outer periphery in a direction intersecting the axial direction, a block body 73 through which the lock pin 71 is inserted and the spring pin 72 is locked. Knob 74 of.

The lock pin 71 moves in the axial direction while rotating around the axis according to the operation of the knob 74 by horizontally rotating the knob 74 attached to the lower end portion in the axial direction. The upper end of the lock pin 71 is fitted to the first fitting portion 621 or the second fitting portion 622 of the upper plate 62A by operating in the upward direction. When the upper end of the lock pin 71 is fitted to the first fitting portion 621, the mirror 40 is in the locked state at the use position X, and when the upper end of the lock pin 71 is fitted to the second fitting portion 622. The mirror 40 is locked at the storage position Y. Note that FIG. 4 shows a state in which the upper end portion of the lock pin 71 is fitted in the first fitting portion 621.

As shown in FIG. 6, the lock pin 71 is formed with a through hole 711 penetrating in a direction (radial direction) intersecting the axial direction at a central portion in the axial direction. Further, the lock pin 71 has a flange 712 protruding from the outer periphery between the upper end portion and the through hole 711.

The spring pin 72 is a pin member having a C-shaped cross section and having elasticity, and is fitted in the through hole 711 of the lock pin 71 by being urged in the radial direction. The spring pin 72 fitted in the through hole 711 has both axial ends extending from the through hole 711. That is, the spring pin 72 is formed such that its axial length is larger than the length of the through hole 711 in the penetrating direction (the outer diameter of the lock pin 71).

The block body 73 is formed in a rectangular parallelepiped shape, and as shown in FIG. 7, an insertion hole 73A into which the lock pin 71 is inserted, and a recess 73B recessed in the axial direction of the lock pin 71 inserted into the insertion hole 73A. And a pair of bolt holes 73C through which a pair of bolts 730 for fixing the block body 73 to the upper bracket 5A are inserted. The insertion hole 73A penetrates through the central portion of the block body 73, and the pair of bolt holes 73C are arranged diagonally opposite to each other.

As shown in FIG. 4, the block body 73 is fixed to the lower portion of the main body portion 52 of the upper bracket 5A with a pair of bolts 730 from below through the plate material 75 so that the recessed portion 73B is recessed upward. .. At this time, the lock pin 71 is inserted from below into the insertion hole 73A of the block body 73 and the second insertion hole 522 of the main body portion 52 of the upper bracket 5A, and the spring member 710 disposed between the flange 712 and the block body 73. It is attached to the main body 52 by the urging force of. Therefore, the upper rod 63 and the lock pin 71 are arranged side by side in the left-right direction, and the upper rod 63 is arranged on the fixed plate 51 side in the left-right direction.

As shown in FIG. 7, the recess 73B is formed around the insertion hole 73A and inside the pair of bolt holes 73C, and includes the first to fourth small recesses 731A to 731D and the first to fourth recesses. It is configured by a first large recess 732A and a second large recess 732B that are recessed larger than the small recesses 731A to 731D. In the state where the block body 73 is fixed to the main body 52, the vertical lengths (heights) of the first large recess 732A and the second large recess 732B are respectively the first to fourth small recesses 731A to 731D. It is longer than the vertical length of each, in other words, the tops of the first large recess 732A and the second large recess 732B are located above the positions of the tops of the first to fourth small recesses 731A to 731D, respectively. (See FIG. 4).

The first large concave portion 732A and the second large concave portion 732B are arranged facing each other to form a pair. The first small recess 731A is adjacent to one side of the first large recess 732A, and the second small recess 731B is adjacent to the other side thereof. Further, the third small recess 731C is adjacent to one side of the second large recess 732B, and the fourth small recess 731D is adjacent to the other side thereof. The first small recess 731A and the third small recess 731C are arranged to face each other to form a pair, and the second small recess 731B and the fourth small recess 731D are arranged to face each other to form a pair.

Between the first small recess 731A and the fourth small recess 731D, and between the second small recess 731B and the third small recess 731C, protrusions 73D protruding toward the center are provided. Therefore, the first small recess 731A and the fourth small recess 731D are not adjacent to each other, and similarly, the second small recess 731B and the third small recess 731C are not adjacent to each other.

As shown in FIG. 4, the upper end portion of the lock pin 71 is fitted to the first fitting portion 621 or the second fitting portion 622 in the pair of the first large concave portion 732A and the second large concave portion 732B. In the state, the extending portions of the spring pins 72 are locked.

On the other hand, in the paired first small recess 731A and third small recess 731C, and the paired second small recess 731B and fourth small recess 731D, the upper end of the lock pin 71 is the first fitting portion 621 or the first fitting portion 621. The extended portions of the spring pins 72 are locked when they are separated from the second fitting portion 622.

A first inclined surface 734A inclined toward the first small concave portion 731A and a second inclined surface 734B inclined toward the second small concave portion 731B are smoothly connected to each other in the first large concave portion 732A. Similarly, a third inclined surface 734C inclined toward the third small concave portion 731C and a fourth inclined surface 734D inclined toward the fourth small concave portion 731D are smoothly formed in the second large concave portion 732B. ing. The outer peripheral surface of the extended portion of the spring pin 72 slides on the first to fourth inclined surfaces 734A to 734D when the lock pin 71 moves in the axial direction.

(Operation of locking device 7)
Next, the operation of the lock device 7 will be described with reference to FIGS. 8 and 9.

FIG. 8 is a transparent side view illustrating the structure of the lock device 7 in the locked state. FIG. 9 is a transparent side view illustrating the structure of the lock device 7 in the unlocked state.

For example, as shown in FIG. 8, when the lock pin 71 is fitted in the first fitting portion 621, the extending portion of the spring pin 72 is engaged with the first large recess 732A and the second large recess 732B. It has been stopped. At this time, the mirror 40 is in the locked state at the use position X.

From this state, when the knob 74 is turned in the direction of arrow Z shown in FIG. 8, the lock pin 71 rotates around the axis and moves downward as the knob 74 rotates. At this time, as shown in FIG. 9, the flange 712 presses the spring member 710 downward, and the spring member 710 urges downward. The spring pin 72 moves toward the first small concave portion 731A and the third small concave portion 731C while the extending portion slides on the first inclined surface 734A and the third inclined surface 734C, and the first small concave portion 731A and the third small concave portion 731A. It is locked by the small recess 731C. The lock pin 71 is disengaged from the first fitting portion 621, the locked state of the mirror 40 is released, and the upper plate 62A is rotatable about the upper rod 63 as a rotation center to the storage position Y. Since the extended portion of the spring pin 72 contacts the pair of protrusions 73D, the knob 74 cannot be rotated more than necessary in the direction of arrow Z.

8 and 9, only the first large concave portion 732A, the first small concave portion 731A, and the first inclined surface 734A side are shown. Although the operation of the lock device 7 when the knob 74 is turned in the direction of the arrow Z has been described, the lock device 7 operates in the same manner even when the knob 74 is turned in the direction opposite to the arrow Z. Becomes In this case, the extended portion of the spring pin 72 moves toward the second small recess 731B and the fourth small recess 731D while sliding on the second inclined surface 734B and the fourth inclined surface 734D to move to the second small recess 731B. And the fourth small recess 731D. Then, as in the case where the knob 74 is turned in the direction of arrow Z, the extending portions of the spring pins 72 abut the pair of protrusions 73D, respectively, so that the knob 74 is required in the direction opposite to the arrow Z more than necessary. It can no longer be turned.

Since the first to fourth inclined surfaces 734A to 734D are formed in the first large recessed portion 732A and the second large recessed portion 732B, the spring pin 72 causes the first inclined surface 734A and the first inclined surface 734A to be rotated only by turning the knob 74. The third slanted surface 734C or the second slanted surface 734B and the fourth slanted surface 734D are naturally moved downward while sliding to move to the first small recess 731A and the third small recess 731C or the second small recess 731B and the fourth small recess. Since it is locked in the recess 731D, it is not necessary to perform an operation that requires a force such as pulling the knob 74 downward to disengage the spring pin 72 from the first large recess 732A and the second large recess 732B. As a result, the operation for releasing the locked state of the mirror 40 is simplified and the operability is improved, and the operator and the worker can perform the unlocking operation of the lock device 7 in a stable posture.

In the present embodiment, the first fitting portion 621 and the second fitting portion 622 provided on the upper plate 62A are recessed upward with the upper plate 62A disposed on the upper portion of the main body 52. Since it is a part, unlike the case where it is a through hole penetrating in the thickness direction of the upper plate 62A, rainwater, dust, etc. enter the inside of the lock device 7 through the first fitting part 621 and the second fitting part 622. difficult.

Further, in the present embodiment, when the upper end portion of the lock pin 71 is fitted to the first fitting portion 621, the second side surface 623B of the upper plate 62A is in contact with the fixed plate portion 51 of the upper bracket 5A, When the upper end portion of the lock pin 71 is fitted to the second fitting portion 622, the first side surface 623A of the upper plate 62A is in contact with the fixed plate portion 51, so that the upper plate 62A may rotate too much. Since the upper plate 62A is positioned with respect to the main body 52, it is easy to fit the upper end of the lock pin 71 to the first fitting portion 621 and the second fitting portion 622.

Further, in the present embodiment, since the lock device 7 is provided on the upper bracket 5A, an operator, a worker or the like can perform the lock operation or the unlock operation of the mirror 40 at a height close to his or her own line of sight. , Easy to operate.

The embodiments of the present invention have been described above. It should be noted that the present invention is not limited to the above-described embodiment, and various modifications are included. For example, the above-described embodiments have been described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those including all the configurations described. Further, a part of the configuration of this embodiment can be replaced with the configuration of another embodiment, and the configuration of this embodiment can be added to the configuration of another embodiment. Furthermore, it is possible to add/delete/replace other configurations with respect to a part of the configurations of the present embodiment.

For example, in the above embodiment, the wheel loader 1 is described as one mode of the work vehicle, but the present invention is not limited to this, and may be another work vehicle such as a hydraulic excavator.

Further, in the above embodiment, the lock device 7 is provided on the upper bracket 5A, but the lock device 7 is not limited to this and may be provided on the lower bracket 5B. In that case, the configuration on the upper bracket 5A side and the configuration on the lower bracket 5B side in the mirror unit 4 are opposite.

Further, in the above-described embodiment, the first fitting portion 621 and the second fitting portion 622 provided on the upper plate 62A are both recessed portions that are recessed in the thickness direction, but the invention is not limited to this, and the lock pin is not limited thereto. It may be a hole or the like as long as the upper end portion of 71 is fitted.

Further, in the above-described embodiment, the upper plate 62A is formed in a fan shape so that the first side surface 623A and the second side surface 623B come into contact with the fixed plate portion 51 of the upper bracket 5A when rotated about the upper rod 63. However, the shape is not necessarily limited to a fan shape, and the shape is not particularly limited.

1: Wheel loader (work vehicle)
5A, 5B: Bracket (mounting member)
6: Moving device 7: Locking device 31: Driver's cab 40: Mirror 61: Mirror stays 62A, 62B: Plates (plate-shaped members)
63: Rod (rotating shaft member)
71: Lock pin (shaft)
72: Spring pin (pin member)
73: Block body 611: Attached part 612: Upper extension part 613: Lower extension part 621: First fitting part 622: Second fitting parts 623A, 623B: First and second side faces 731A to 731D: 1st-4th small recessed part 732A, 732B: 1st and 2nd large recessed part 734A-734D: 1st-4th inclined surface X: Use position Y: Storage position

Claims (4)

In a work vehicle in which mirrors for checking the rear of the vehicle body are attached to the left and right sides of the cab via attachment members,
A moving device that can move the mirror between a use position that projects outward in the left-right direction of the cab and a storage position that is closer to the cab than the use position.
A lock device provided on the attachment member for locking the mirror at the use position and the storage position, respectively,
The moving device is
A mirror stay formed by bending a rod-shaped member and having the mirror attached,
A plate-shaped member having a thickness in the up-down direction of the vehicle body, to which an end of the mirror stay is fixed,
A rotary shaft member that is inserted into a through hole formed in the plate-shaped member and penetrates in the thickness direction and that rotatably mounts the plate-shaped member to the mounting member and serves as a rotation center of the mirror stay. Then
The locking device is
A shaft body that is disposed with an axis in the vertical direction of the vehicle body and that moves in the axial direction while rotating;
A pin member extending from the outer periphery of the shaft body in a direction intersecting the axial direction,
A block body into which the shaft body is inserted and the pin member is locked,
The plate-shaped member,
A first fitting portion into which one end portion of the shaft body fits in the use position;
A second fitting portion into which the one end portion of the shaft body is fitted at the storage position,
In the block body,
The pin member is recessed in the axial direction of the shaft body, and the pin member is locked when the one end portion of the shaft body is disengaged from the first fitting portion or the second fitting portion. A recess,
The pin is recessed more in the axial direction of the shaft than the small recess, and the pin is in a state in which the one end of the shaft is fitted to the first fitting part or the second fitting part. A large recess in which the member is locked is provided adjacently,
The work vehicle, wherein the large concave portion is formed with an inclined surface that is inclined toward the small concave portion and is in sliding contact with the pin member during operation of the shaft body. In the work vehicle according to claim 1,
The work vehicle, wherein each of the first fitting portion and the second fitting portion is a recessed portion that is recessed in the thickness direction of the plate-shaped member. In the work vehicle according to claim 1,
The mounting members are provided side by side in the vertical direction of the cab,
The plate-shaped member is arranged corresponding to each of the upper mounting member and the lower mounting member,
The mirror stay is
A mounted portion that extends in the vertical direction of the vehicle body and on which the mirror is mounted,
An upper extending portion that extends from the upper end of the mounted portion and is fixed to the plate-shaped member disposed on the upper side;
A lower extension portion that extends from a lower end portion of the mounted portion and is fixed to the plate-shaped member disposed on the lower side,
The work vehicle, wherein the lock device is provided on the upper mounting member. In the work vehicle according to claim 1,
The plate-shaped member,
When fitting the one end portion of the shaft body to the first fitting portion, a side surface along the direction of arrangement of the through hole and the second fitting portion contacts the mounting member,
When fitting the one end portion of the shaft body to the second fitting portion, the side surface along the alignment direction of the through hole and the first fitting portion may be in contact with the mounting member. Characterized work vehicle.

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