JP2018130098A - Work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain operability of an operation member while reducing in size.SOLUTION: A work vehicle according to the embodiment includes a brake mechanism, a brake pedal, a brake lock mechanism, and an operation member. The brake mechanism stops a vehicle body. The brake pedal is supported swingably to a support frame in a front-rear direction, and is operated when operating the brake mechanism. The brake lock mechanism locks the brake pedal with the brake mechanism in an operation state. The operation member extends in a front part of the vehicle body and is operated when operating the brake mechanism from outside of the vehicle body. The operation member is inclined frontward to connect to the support frame and is provided swingably in a front-rear direction about a base end part, and moves within a range of the front part of the vehicle body when a handle part provided to a tip part is operated so that the operation member is swung.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a work vehicle.

  2. Description of the Related Art Conventionally, some work vehicles such as a seedling transplanter operate a brake pedal by operating an operation arm that is extended to a brake pedal that is depressed when the body is stopped on a floor step. In this case, the operator can get off the aircraft and use the operation arm as a hand brake from the outside of the aircraft.

  In addition, there is an operation arm (hand brake) that is rotatably supported on a rotation shaft on a floor step and connected to a brake pedal (for example, see Patent Document 1).

JP 2007-319024 A

  In recent years, there has been a demand for downsizing of an airframe in a work vehicle such as a seedling transplanter. When downsizing the airframe, it is necessary to shorten the front-rear length and the left-right width of the airframe, and in particular, shortening the front-rear length (also referred to as the total length) of the airframe is required.

  However, in the conventional work vehicle as described above, since the operation arm capable of operating the brake pedal from the outside of the body projects forward, the body becomes long in the front-rear direction. If the operation arm is shortened in order to suppress the protrusion of the operation arm, the grip portion of the operation arm becomes difficult to grip, and it is difficult for the operator to apply force and the operability is lowered.

  The present invention has been made in view of the above, and an object of the present invention is to provide a work vehicle that can be downsized while maintaining the operability of the operation member.

  In order to solve the above-described problems and achieve the object, the work vehicle according to claim 1 is supported by a brake mechanism for stopping the airframe and a support frame so as to be swingable in the front-rear direction, and operates the brake mechanism. A brake pedal that is operated when the brake mechanism is operated, a brake lock mechanism that locks the brake pedal in a state in which the brake mechanism is operated, and a case where the brake mechanism is extended from the front of the body and is operated from the outside of the body The operation member is tilted forward and connected to the support frame, and is provided to be swingable in the front-rear direction with the base end portion as a fulcrum, and provided at the distal end portion. When the handle member is operated to swing the operation member, the distal end portion moves within the range of the front part of the machine body.

  A work vehicle according to a second aspect of the present invention is the work vehicle according to the first aspect, wherein the brake pedal that fixes the brake pedal at a position where the brake mechanism is operated, the lock member constituting the brake lock mechanism, and the front part of the fuselage An unlocking member that extends from the outside of the machine body and releases the brake pedal fixed by the locking member of the brake locking mechanism. The unlocking member is connected to the locking member and extends in the front-rear direction. It is provided so that it can be swung, and when the lock release member is swung by operating a handle portion provided at the front end, the front end moves within the range of the front part of the fuselage.

  A work vehicle according to a third aspect is the work vehicle according to the first or second aspect, further comprising a handle portion that is provided at a central portion of the front end of the machine body and tilts forward with the machine body side as a fulcrum.

  The work vehicle according to claim 4 is the work vehicle according to any one of claims 1 to 3, wherein a seedling planting unit for planting seedlings loaded on a rear part of the machine body in a farm field, and the seedling planting unit. A lifting link that supports the lift at the rear part of the machine body, a leveling device that leveles the field, a suspension member that suspends the leveling device from the lifting link, and a telescopic drive shaft that transmits a driving force to the leveling device. And an angle changing mechanism that connects the drive shaft to the leveling device so that the angle can be changed.

  The work vehicle according to claim 5 is the work vehicle according to claim 4, wherein the drive shaft case connected to the drive shaft and housing a rear end portion of the drive shaft is connected to the elevating link to connect the drive vehicle. It is further characterized by further comprising a first rod whose length can be adjusted to restrict the rotation of the shaft, and a second rod whose length can be adjusted that connects the front end of the drive shaft and the elevating link.

  A work vehicle according to a sixth aspect of the present invention is the work vehicle according to any one of the first to fifth aspects, further comprising auxiliary steps provided on left and right side portions of a main frame of the fuselage. A U-shaped auxiliary frame extending obliquely downward on the outside of the main frame, an auxiliary plate provided in the auxiliary frame and having a hole formed on the upper surface, and the auxiliary plate above the auxiliary frame and the auxiliary plate A step member fixed to the auxiliary plate via a fixing member attached to the hole portion and formed in a lattice shape in a top view, and extends in the left-right direction below the main frame, and the left and right end portions are And an auxiliary member fixed to the auxiliary plate while being in contact with the inner surface of the step member.

  According to the first aspect of the present invention, the operating member is connected to the support frame that supports the brake pedal in an oblique posture, and the tip moves within the range of the front of the fuselage even if the operating member is swung. By doing so, it does not protrude forward of the aircraft. Thereby, size reduction of an airframe can be achieved, maintaining operability by ensuring the length of an operation member. In addition, since the operating member does not protrude forward of the aircraft, when storing the aircraft in a narrow space, the operation member (tip) protrudes and the operability is reduced such that it is difficult to operate in a narrow space. Damage can be suppressed.

  According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, even if the unlocking member swings the unlocking member, the tip part moves within the range of the front part of the fuselage. Therefore, it does not protrude in front of the aircraft. Thereby, by ensuring the length of the unlocking member, it is possible to reduce the size of the airframe while maintaining operability. In addition, since the unlocking member does not protrude forward of the fuselage, when storing the fuselage in a narrow space, the lock release member (front end) protrudes and the operability is reduced such that it is difficult to operate in a narrow space. Breakage of the release member can be suppressed.

  According to the invention described in claim 3, in addition to the effect of the invention described in claim 1 or 2, since the handle portion tilting forward is provided at the front end of the machine body, the operator can hold the handle portion. For example, it is possible to improve the safety by suppressing the rollover of the aircraft due to the aircraft rising forward on an inclined ground or the like. Further, since the airframe can be stopped by the operation member or the unlocking member while the handle portion holds down the front elevation of the airframe, the rollover of the airframe can be further suppressed, and the safety can be further improved. In addition, the aircraft can be loaded into a small transport vehicle such as a light truck while holding the front part of the aircraft up by the handle, and the operation member and lock release member do not protrude forward from the aircraft. Can be loaded easily.

  According to the invention described in claim 4, in addition to the effect of the invention described in any one of claims 1-3, the drive shaft is provided in the angle change mechanism by providing the drive shaft with the angle change mechanism. Bend freely. Thereby, when the raising / lowering mechanism and the seedling planting part roll left and right, for example, the load applied to the drive shaft can be reduced. Moreover, the suspension member of the leveling device can be fixed by bending the angle changing mechanism freely. For this reason, it becomes unnecessary to provide a movable part etc. in a suspending member, and can reduce a number of parts. Thereby, the load added to a drive shaft can be reduced by an inexpensive structure. In addition, the suspension member connects the lifting link and the drive shaft, so that the seedling planting part rises, and the drive shaft falls even when, for example, the extension / contraction mechanism of the drive shaft extends more than specified. Can be prevented.

  According to the invention described in claim 5, in addition to the effect of the invention described in claim 4, the drive shaft case is rotated forward by connecting the drive shaft case and the lifting link of the leveling device. By regulating, the amount of bending of the drive shaft can be reduced. Thereby, breakage and wear of the drive shaft can be suppressed. In addition, the second rod is provided at the front end of the drive shaft, and the length of each of the first rod and the second rod can be adjusted, thereby minimizing the amount of bending of the drive shaft. In addition, the length of the rod can be adjusted according to individual differences of the aircraft. In addition, the drive shaft can be prevented from falling.

  According to the invention described in claim 6, in addition to the effect of the invention described in any one of claims 1 to 5, the auxiliary step is configured in a multiple manner by the step member, the auxiliary frame, the auxiliary plate, and the auxiliary member. Therefore, the strength of the auxiliary step can be improved. In addition, since the auxiliary frame is U-shaped and the step members provided on the auxiliary frame are lattice-like when viewed from above, visibility can be improved, for example, the ground can be seen from above. Further, the step member is firmly fixed by the fixing member attached to the hole portion of the auxiliary plate. In addition, since the inner surface of the step member is in contact with the auxiliary member extending in the left-right direction, even if a force is applied to the step member from the outside, deviation is unlikely to occur. Thereby, the intensity | strength of an auxiliary | assistant step can be improved.

FIG. 1 is a schematic left side view of a work vehicle. FIG. 2 is a schematic plan view of the work vehicle. FIG. 3 is an explanatory diagram of the operation member, the lock member, and the lock release member. FIG. 4 is an operation explanatory view (No. 1) of the operation member, the lock member, and the lock release member. FIG. 5 is an operation explanatory diagram (No. 2) of the operation member, the lock member, and the lock release member. FIG. 6 is an explanatory diagram (No. 1) of a modification of the operation member. FIG. 7 is an explanatory diagram (No. 2) of a modified example of the operation member. FIG. 8 is an explanatory diagram (part 1) of the leveling device. FIG. 9 is an explanatory diagram (part 2) of the leveling device. FIG. 10 is an explanatory diagram of a modified example of the leveling device. FIG. 11 is a schematic perspective view of a protection member for the drive shaft. FIG. 12 is a schematic plan view of the auxiliary step. FIG. 13 is a schematic perspective view of the auxiliary step.

  Hereinafter, an embodiment of a work vehicle disclosed in the present application will be described in detail with reference to the accompanying drawings. In addition, this invention is not limited by embodiment shown below.

<Overall configuration of work vehicle (seedling transplanter) 1>
With reference to FIG. 1 and FIG. 2, the whole structure of the working vehicle (seedling transplanter) 1 which concerns on embodiment is demonstrated. FIG. 1 is a schematic left side view of a work vehicle (seedling transplanter) 1. FIG. 2 is a schematic plan view of the work vehicle (seedling transplanter) 1. In FIG. 2, for convenience of explanation, the front half of the traveling vehicle body 2 is shown, and the wheels (front wheels 3) and the like are omitted. Hereinafter, as the work vehicle 1, a seedling transplanting machine for planting seedlings in the field while traveling in the field will be described as an example.

  In the following description, the front-rear direction is a traveling direction when the work vehicle (hereinafter referred to as “seedling transplanter”) 1 travels straight, and the front side in the traveling direction is “front” and the rear side is “rear”. It prescribes. In addition, the advancing direction of the seedling transplanter 1 is a direction from the cockpit 10 toward the steering handle 12 when the vehicle is traveling straight (see FIG. 1).

  The left-right direction is a direction that is horizontally orthogonal to the front-rear direction. In the following, left and right are defined toward the “front” side. That is, in a state where an operator (also referred to as “pilot”) is seated on the cockpit 10 and facing forward, the left hand side is “left” and the right hand side is “right”. Further, the vertical direction is the vertical direction. The front-rear direction, the left-right direction, and the up-down direction are orthogonal to each other.

  In addition, these directions are defined for convenience in order to make the explanation easy to understand, and the present invention is not limited by these directions. In the following, the seedling transplanter 1 may be referred to as “airframe”.

  As shown in FIG. 1, the seedling transplanter 1 includes a traveling vehicle body 2 capable of traveling in a farm field. The traveling vehicle body 2 includes a pair of left and right front wheels 3 and a pair of left and right rear wheels 4. The traveling vehicle body 2 is, for example, a four-wheel drive in which the front wheels 3 and the rear wheels 4 are driven. In addition, a seedling planting section 30 that can be moved up and down by a lifting mechanism (hereinafter referred to as “seedling planting section lifting mechanism”) 20 is provided at the rear of the traveling vehicle body 2.

  The traveling vehicle body 2 transmits a main frame 5 serving as a body frame, an engine mounted on the main frame 5, and power generated by the engine to driving wheels (front wheels 3 and rear wheels 4) and a seedling planting unit 30. The power transmission device 6 is provided. That is, the power generated by the engine that is the power source is used not only for moving the traveling vehicle body 2 forward or backward, but also for driving the seedling planting unit 30.

  The engine is disposed at a position protruding substantially above the floor step 7 on which an operator puts his / her foot when getting on, approximately at the center of the traveling vehicle body 2 in the left / right direction. For example, a heat engine such as a diesel engine or a gasoline engine is used as the engine. The floor step 7 is provided at the front portion of the traveling vehicle body 2 in the front-rear direction. The floor step 7 is provided between the front end of the traveling vehicle body 2 and the rear part of the engine.

  The floor step 7 is attached on the main frame 5. At least a part of the floor step 7 in the vicinity of the cockpit 10 described later is formed in a lattice shape when viewed in the vertical direction so that mud and the like adhering to the operator's shoes can be dropped onto the field. A rear step that also serves as a fender for the rear wheel 4 may be provided at the rear of the floor step 7.

  In this case, the rear step is disposed on both the left and right sides of the engine so as to sandwich the engine in the left and right direction. The engine is covered with an engine cover 9. A cockpit 10 is provided above the engine cover 9.

  The power transmission device 6 includes a belt-type power transmission device that transmits power from the engine, a hydraulic continuously variable transmission that is a transmission that shifts power transmitted from the engine via the belt-type power transmission device, a transmission, And a case.

  The hydraulic continuously variable transmission is configured as a hydrostatic continuously variable transmission called HST (Hydro Static Transmission). The hydraulic continuously variable transmission can change the output (rotation speed) and the output direction (rotation direction) by operating the main transmission lever. In other words, the hydraulic continuously variable transmission can change the forward and backward travel and the traveling speed of the traveling vehicle body 2 by changing the rotational speed and the rotational direction.

  The transmission case is provided with a transmission that transmits the power from the engine, which is changed by the hydraulic continuously variable transmission, to each part. The transmission case also includes a sub-transmission mechanism that switches the travel speed during travel and work. When the sub-shift lever is operated, the travel speed of the traveling vehicle body 2 is set, for example, the travel speed during planting work. It is possible to switch to a higher traveling speed, seedling planting speed, etc. during planting work.

  Further, the front wheel 3 is connected to the front wheel final case so as to be steerable in accordance with the operation of the steering handle 12. Further, the rear wheel 4 is connected to a rear wheel gear case.

  The seedling planting part lifting mechanism 20 includes a lifting link 21. The lifting link 21 includes a parallel link that connects the rear portion of the traveling vehicle body 2 and the seedling planting portion 30. The parallel link is connected to each of the link frame and the seedling planting portion 30 so as to be rotatable in the vertical direction, so that the seedling planting portion 30 can be raised and lowered with respect to the traveling vehicle body 2.

  In addition, the seedling planting part lifting mechanism 20 includes a hydraulic lifting cylinder 22 (see FIG. 1). The raising / lowering cylinder 22 moves up and down by driving the raising / lowering link 21 by operating the planting raising / lowering lever 13 and switching the hydraulic valve to drive the raising / lowering link 21.

  Moreover, the raising / lowering cylinder 22 operates the plant raising / lowering lever 13 of the control part 14 mentioned later, the non-working position which raised the seedling planting part 30, and the ground work position which lowered the seedling planting part 30 (Also referred to as “planting position”). In addition, you may comprise the raising / lowering cylinder 22 so that the seedling planting part 30 may be raised / lowered based on the information regarding the condition of a farm field.

  The seedling planting part 30 is attached to the rear part of the traveling vehicle body 2 via the lifting link 21. The seedling planting unit 30 can plant seedlings in a plurality of sections or a plurality of rows (rows). The seedling planting unit 30 includes a seedling placement table 31, a float 32, and a seedling planting device 33.

  The seedling placement table 31 has as many seedling placement surfaces as the number of planting strips in the left-right direction. Each seedling placement surface is a rearwardly inclined surface on which a plurality of soiled mat-like seedlings can be placed in the vertical direction. As the traveling vehicle body 2 moves, the float 32 slides on the field and levels the ground. The float 32 includes a center float disposed in the center of the machine body and a side float disposed outside the center float in the left-right direction.

  Each float is rotatably attached to the traveling vehicle body 2 so that the front end side moves up and down according to the unevenness of the topsoil surface of the field. The seedling planting device 33 detects the vertical movement of the center float with a rotation sensor for controlling the angle of attack. In the seedling planting section 30, the vertical movement of the front part of the center float is detected by a rotation sensor during planting work, and the control unit (also referred to as “controller”) controls the lifting cylinder 22 according to the detection result of the rotation sensor. The seedling planting part 30 can be raised and lowered by switching the hydraulic valve that controls the expansion and contraction operation, and the seedling planting depth can be adjusted.

  The seedling planting device 33 is supported by the planting support frame of the seedling mounting table 31 and is disposed below the seedling mounting table 31. The seedling planting device 33 takes seedlings placed on the seedling placement table 31 and places them in the field. The seedling planting device 33 includes a planting basket, a rotary case, and a planting transmission case.

  The planting culm takes seedlings from the seedling mounting table 31 and plants them in the field. The planting basket is rotatably connected to the planting transmission case. The rotary case rotatably supports the planting basket and is rotatably coupled to the planting transmission case.

  The rotary case has an inconstant speed transmission mechanism that can rotate the implant cage while changing the rotation speed of the implant cage. Depending on the rotation angle of the implant cage with respect to the rotary case, it is rotated while changing the rotation speed of the implant cage. The planting transmission case transmits the power transmitted from the engine to the seedling planting unit 30 to the planting basket.

  A leveling device 40 is provided at the rear of the traveling vehicle body 2. The leveling device (hereinafter, referred to as “leveling rotor”) 40 is for leveling the field. The leveling rotor 40 is provided below the seedling planting device 33. The leveling rotor 40 is supported by an electric motor or the like so as to be movable up and down with respect to the planting support frame of the seedling planting device 33. The leveling rotor 40 includes a center rotor, a side rotor, and an electric mechanism.

  The center rotor is disposed at the center of the body in the left-right direction. For example, the side rotor is disposed behind the center rotor, and is disposed on the outer side of the machine body relative to the center rotor in the left-right direction. The center rotor is rotationally driven by power transmitted from the engine via an electric mechanism and a drive shaft 46 (see FIG. 8) connected to the rear wheel gear case. Similarly, the side rotor is rotationally driven by the power transmitted from the engine via the drive shaft 46.

  The traveling vehicle body 2 is provided with a fertilizer application device 41. The fertilizer application device 41 applies fertilizer to a farm field. The fertilizer applicator 41 is provided, for example, behind the cockpit 10. The fertilizer application device 41 can release the granular fertilizer stored in the hopper to the field by a set amount during planting work. The fertilizer application device 41 includes a fertilizer application amount adjustment motor that constitutes a variable fertilizer mechanism connected to the controller, and is capable of adjusting the fertilizer application amount that is the fertilizer application amount.

  A control unit 14 is provided in front of the cockpit 10. In addition to the steering handle 12, the planting lift lever 13, the main transmission lever and the auxiliary transmission lever, the steering section 14 is provided with a bonnet 15, a front cover 15a, a display section, and the like.

  The bonnet 15 is provided so as to protrude upward from the floor step 7 in front of the cockpit 10. The bonnet 15 includes, for example, a chargeable / dischargeable battery, operation members such as a main transmission lever and a planting lift lever 13, a motor that switches the planting operation lever 13 to “planting down” when the traveling vehicle body 2 turns, and a main transmission lever And a potentiometer that detects the angle of an operation member such as a planting operation lever 13.

  The display unit (hereinafter referred to as “meter panel”) is provided at the upper part of the bonnet 15. The meter panel is inclined rearward and downward so as to face an operator seated in the cockpit 10. Further, the meter panel has, for example, a marker sensor for detecting that the left and right markers 42 for drawing a line on the field are on the field scene, and the planting lift lever 13 is at a position of “planting”, for example. A planting lever position sensor for detecting the operation position of the planting lift lever 13, a fertilizer run-out sensor for detecting that the fertilizer in the hopper of the fertilizer application has fallen below a predetermined amount, and a path for introducing fertilizer from the hopper to the field It has various sensors such as a fertilizer clogging sensor that detects the occurrence of this.

  As described above, the steering handle 12 is operated by the operator to steer the traveling vehicle body 2. The steering handle 12 is provided above the bonnet 15. The steering handle 12 is disposed at the center of the bonnet 15 in the left-right direction. The steering handle 12 steers the front wheel 3 via a steering mechanism disposed in the bonnet 15.

  The main transmission lever (also referred to as “HST lever”) is a lever that is operated to move the traveling vehicle body 2 forward and backward and to change the traveling speed. The main transmission lever is provided at the upper part of the bonnet 15, for example.

  The planting elevating lever 13 is a clutch lever, and is a lever operated to raise and lower the seedling planting unit 30 and to start and stop planting seedlings by the seedling planting unit 30. The planting lift lever 13 is provided, for example, at the top of the bonnet 15.

  The front cover 15 a is a cover member that covers a space formed in the front portion of the bonnet 15. The front cover 15a is formed so that, for example, the width in the left-right direction and the width in the up-down direction become narrower from the rear to the front of the aircraft. The front cover 15a is provided so as to be opened and closed by rotating forward from the hood 15.

  Further, as shown in FIG. 2, a handle portion 16 is provided at the center in the left-right direction at the front end of the traveling vehicle body 2. The handle portion 16 is, for example, a loop-shaped handle in a front view. For example, an operator standing in front of the traveling vehicle body 2 grips and holds the loop portion by hand to prevent the traveling vehicle body 2 from being lifted forward. can do. The handle portion 16 is provided so as to be tiltable forward with the body side as a fulcrum. The seedling transplanter 1 is configured such that the traveling vehicle body 2 moves at a predetermined speed when the handle portion 16 is pushed down.

  Note that an emergency stop switch is provided on either the left or right side of the handle portion 16, for example. When the emergency stop switch is operated, the engine stops. Such a handle portion 16 and an emergency stop switch can safely perform a moving operation or the like when loading and unloading the airframe on a small transport vehicle such as a bridge or a light truck. For example, in the case of an aircraft operation in a place where it is difficult to perform an operation, the worker gets off the aircraft and switches to a walking operation using the handle portion 16. Thereby, safety is improved.

  In addition, the traveling vehicle body 2 is locked with a brake mechanism 50 or a brake mechanism 50 for stopping the vehicle body in the vicinity of the handle portion 16 in order for the operator to use the overpass and loading / unloading of the vehicle body together with the handle portion 16. An operation member 53 and a lock release member 56 for operating the brake lock mechanism 54 from the outside of the machine body are provided.

<Operation member 53, lock member 55, and lock release member 56>
Next, the operation member 53, the lock member 55, and the lock release member 56 will be described with reference to FIGS. FIG. 3 is an explanatory diagram of the operation member 53, the lock member 55, and the lock release member 56. FIG. 3 shows a plan view of each member (the operation member 53, the lock member 55, and the lock release member 56).

  4 and 5 are operation explanatory views of the operation member 53, the lock member 55, and the lock release member 56. FIG. 4 shows a right side view of each member (operation member 53, lock member 55, and unlock member 56) in the unlocked state, and FIG. 5 shows a right side view of each part in the locked state. Yes.

  Here, the brake mechanism 50 will be briefly described. The brake mechanism 50 is a left and right clutch brake mechanism provided in the transmission case. The brake mechanism 50 decelerates the right and left drive shafts that transmit driving force from the engine to the left and right rear wheel gear cases by applying resistance, and is driven by the drive shaft. Blocks power from being transmitted.

  In the left and right brake mechanisms 50, for example, stays (hereinafter referred to as “brake stays”) are fixed to the left and right sides of a transmission rotating shaft that is rotated by a driving force transmitted from a branch gear case, and a clutch (hereinafter referred to as a “side clutch”). ) Is provided so as to be slidable in the left-right direction, a spring for urging the side clutch is provided between the brake stay and the side clutch, and a plurality of leaf spring-like brake plates are provided.

  On the outside of the left and right side clutches, the side clutch is slid inward to reduce the interval between the leaf springs that make up the brake plate to reduce the rotational speed of the left and right drive shafts, and the side clutch is turned off. A decelerating stop cam for interrupting transmission of the driving force to the left and right drive shafts is provided.

  The brake mechanism 50 is connected to a brake pedal 51 provided on the floor step 7. As shown in FIG. 2, the brake pedal 51 is provided, for example, on the left side of the front part on the floor step 7 and is operated when the brake mechanism 50 is operated by an operator. In the brake mechanism 50, when the brake pedal 51 is depressed, either one or both of the left and right cylinder motors that rotate the deceleration stop cam operate to rotate the deceleration stop cam.

  The brake pedal 51 is divided into left and right, and a brake sensor for detecting an operation is provided on both, and the divided brake pedal 51 is connected so that one of the divided brake pedals 51 is interlocked with the other. A connecting member may be provided. The brake pedal 51 is a type in which an operator steps on with his / her foot, but may be a type in which the operator operates with a hand or the like using a lever or the like.

  As shown in FIGS. 4 and 5, the brake pedal 51 is provided at the tip of the support frame 52. The support frame 52 is provided with a brake pedal 51 at a distal end portion, a base end portion is attached to the bonnet 15 side, and is swingable with the base end portion as a fulcrum. That is, the support frame 52 supports the brake pedal 51 so that it can swing along the front-rear direction on the floor step 7 (see FIGS. 1 and 2) according to the operator's stepping operation.

  The brake pedal 51 is connected to an operation member (hereinafter referred to as “operation lever”) 53 via a support frame 52. The operation lever 53 is pivotally connected to the main frame 5 at the base end. As a result, the operation lever 53 can swing along the front-rear direction with the base end portion as a fulcrum (rotation fulcrum 53a). In addition, the operation lever 53 is provided at the front part of the machine body in a posture in which the tip end side disposed above is tilted forward.

  As shown in FIGS. 1 and 2, the operation lever 53 is provided behind the handle portion 16. As shown in FIGS. 4 and 5, the distal end portion of the operation lever 53 is located in the machine body front range A that is behind the handle portion 16. Further, as shown in FIG. 2, the operation lever 53 is provided in the vicinity of the handle portion 16 on the outer side in the left-right direction of the machine body (right side in the drawing) with respect to the handle portion 16. By operating the operation lever 53 to tilt forward, the brake pedal 51 moves forward and the brake pedal 51 is operated. That is, the operator can operate the brake pedal 51 by operating the operation lever 53 from the outside of the machine body.

  As described above, since the tip of the operation lever 53 does not protrude forward of the machine body, damage to the operation lever 53 can be suppressed. Further, since the operation lever 53 is located on the outer side in the left-right direction of the machine body with respect to the handle portion 16, the operator can operate the handle portion 16 with one hand and the operation lever 53 with the other hand. In addition, since it is possible to reach the operation lever 53 by sliding the hand from the handle portion 16, operability and safety can be improved.

  As shown in FIG. 3, the tip of the operation lever 53 is curved toward the inside of the machine body (left side in the figure). The specific shape of the distal end portion of the operation lever 53 is curved outward (first curve) from the straight portion of the operation lever 53 and then curved inward (second curve). The operation lever 53 forms an arc portion from the first curve to the tip through the second curve. A handle portion 53b is provided at the distal end portion of the operation lever 53 (specifically, the distal end side with respect to the arc portion). Note that the front end surface of the handle portion 53b, that is, the front end surface of the operation lever 53 is directed to the inside of the machine body (left side in the left-right direction).

  In this way, the tip of the operation lever 53 has a shape (a saddle shape, more specifically, a question mark (“?”) Shape) that extends from the straight line portion to the handle portion 53b via the arc portion. While saving space, the length of the handle 53b can be increased, and the operability can be improved. Further, since the front end surface of the handle portion 53b is directed to the inside of the machine body, the operator can grip the handle portion 53b by sliding his / her hand from the handle portion 16, thereby improving the operability. .

  As shown in FIG. 3, the handle 53b of the operation lever 53 is provided in parallel with the axis L of the rotation fulcrum 53a. Thereby, the length of the operation lever 53 can be made long, and the load applied to the operation lever 53 can be reduced.

  As described above, the operation lever 53 is connected to the support frame 52 so as to be inclined forward, and is provided so as to be swingable in the front-rear direction with the base end portion as a rotation fulcrum 53a, as shown in FIGS. As described above, when the handle portion 53b of the distal end portion is operated and swung, the distal end portion moves within the body front range A.

  In this way, even if the operation lever 53 is swung, the tip does not move in the front part range A of the machine body and does not protrude forward of the machine body. Therefore, the operability is maintained by securing the length of the operation lever 53. However, the size of the aircraft can be reduced. In addition, since the operation lever 53 does not protrude in front of the airframe, the operation lever 53 (tip portion) protrudes when the airframe is stored in a narrow space (a barn or a loading platform of a small transport vehicle such as a light truck). In addition, it is possible to suppress deterioration in operability such that it is difficult to perform operations in a narrow space and damage to the operation lever 53.

  The brake lock mechanism 54 locks in a state where the brake mechanism 50 is operated. That is, the brake lock mechanism 54 mechanically locks the brake pedal 51 in a state where the brake pedal 51 is depressed. The brake lock mechanism 54 includes a lock member 55, a lock release member 56, and a lock pin 57.

  As shown in FIGS. 4 and 5, the lock member (hereinafter referred to as “lock pedal”) 55 is provided so that the tip end portion thereof overlaps the brake pedal 51. An engaging recess 55 a is provided at the other end of the lock pedal 55. As shown in FIG. 4, the engagement recess 55a is disengaged from the lock pin 57 provided on the machine body side when the brake pedal 51 is not depressed. As shown in FIG. 5, the engagement recess 55 a is engaged with the lock pin 57 in a state where the brake pedal 51 is depressed, and holds the brake pedal 51 at a position where the brake pedal 51 is depressed. When the operator operates the lock pedal 55 from the cockpit 10 side, the brake pedal 51 is unlocked when the operator depresses the lock pedal 55 again.

  As shown in FIGS. 3, 4, and 5, the unlocking member (hereinafter referred to as “unlocking lever”) 56 extends to the front of the machine body, and the brake pedal 51 is fixed by the lock pedal 55 from the outside of the machine body. Is released. The lock release lever 56 is provided so as to be swingable in the front-rear direction. The lock release lever 56 is connected to the lock pedal 55 via a connection link 561.

  As shown in FIG. 3, the distal end portion of the lock release lever 56 is curved toward the inside (left side in the drawing) of the aircraft. The specific shape of the distal end portion of the lock release lever 56 is curved outward (first curve) from the straight portion of the lock release lever 56 and then curved inward (second curve). The lock release lever 56 forms a circular arc portion from the first curve to the tip through the second curve. A handle 56a is provided at the tip of the lock release lever 56 (specifically, the tip of the arc release portion). Note that the front end surface of the handle portion 56a, that is, the front end surface of the lock release lever 56 is directed to the inside of the machine body (left side in the left-right direction).

  As described above, the distal end portion of the lock release lever 56 has a shape (a saddle shape, more specifically, a question mark (“?”) Shape) extending from the straight line portion to the handle portion 56a via the arc portion. The length of the handle portion 56a can be increased while saving space, and the operability can be improved. Moreover, since the front end surface of the handle part 56a is directed to the inside of the machine body, the operator can grip the handle part 56a by sliding his / her hand from the handle part 16, and the operability can be improved.

  As shown in FIG. 3, the lock release lever 56 is provided inside the operation lever 53 in a plan view. In other words, the lock release lever 56 is provided so as not to protrude outward from the operation lever 53 in plan view. For this reason, when operating the operation lever 51, the part caught on the lock release lever 56 is lose | eliminated, and safety can be improved. Further, as shown in FIG. 3, in the operation lever 53 and the lock release lever 56, the hook-shaped opening portion is directed to the inner side in the left-right direction (left side in the drawing) of the aircraft. Thereby, while being able to take the length of each lever 51 and 56, for example, when an operator passes the right side of an airframe, there is no part which is caught and safety can be improved.

  As described above, the lock release lever 56 is connected to the lock pedal 55 and is provided so as to be swingable in the front-rear direction. Further, the lock release lever 56 moves within the front part range A when the lock release lever 56 is swung by operating the handle 56a provided at the front end.

  Thus, the lock release lever 56 does not protrude forward of the aircraft by moving within the aircraft front range A. As a result, by securing the length of the lock release lever 56, it is possible to reduce the size of the aircraft while maintaining operability. In addition, since the lock release lever 56 does not protrude forward of the aircraft, the lock release lever 56 (front end portion) can be used when the aircraft is stored in a narrow space (barn or loading platform of a small transport vehicle such as a light truck). Due to the protrusion, it is possible to suppress a decrease in operability such that it is difficult to operate in a narrow space, and damage to the lock release lever 56 can be suppressed.

  Further, in the seedling transplanting machine 1, since there is a level difference during operations such as crossing over the heel, the worker moves down the aircraft at a low speed while performing a brake operation from the outside of the aircraft after getting off the aircraft. In the seedling transplanter 1, a working machine (such as the seedling planting unit 30) is mounted on the rear side of the machine body, and a cockpit 10 may be provided near the front part of the machine body. During work such as crossing a ridge, the operator gets off the aircraft, reducing the weight on the front side of the aircraft. For this reason, the airframe is stabilized by pressing the front end portion of the airframe while running the above-described handle portion 16 downward. In addition, when loading and unloading the airframe onto a small transport vehicle such as a light truck, the airframe is also moved forward and backward while pressing the handle portion 16 in the same manner.

  As described above, the handle portion 16 is provided at the center of the front end of the aircraft. The handle portion 16 tilts forward with the body side as a fulcrum. For this reason, when the operator presses the handle portion 16, for example, the rollover of the aircraft due to the aircraft rising upward on an inclined ground or the like can be suppressed, and safety can be improved. In addition, since the airframe can be stopped by the operation lever 53 and the lock release lever 56 while the handle portion 16 holds the airframe upward, the rollover of the airframe can be further suppressed to further improve safety. In addition, the airframe can be loaded on a small transport vehicle such as a light truck while the handle 16 holds the front of the airframe upward, and the operation lever 53 and the lock release lever 56 do not protrude forward from the airframe. You can easily load the fuselage into it.

<Modification (Operation Member 60)>
Next, a modified example of the operation member (operation member 60) will be described with reference to FIGS. 6 and 7 are explanatory diagrams of a modification of the operation member (operation member 60). 6 shows a plan view of the operation member 60, and FIG. 7 shows a right side view of the operation member 60. In the following description of the modified examples, the same reference numerals are given to the same or equivalent portions as those of the operation member 53 described above, and the description thereof is omitted.

  As shown in FIGS. 6 and 7, an operation member (hereinafter referred to as “operation lever”) 60 according to the modification includes a rotation fulcrum 60 a at the base end portion and a handle portion 60 b at the tip end side. In the operation lever 60, the handle 60b is bent from the operation lever 60 toward the inside of the machine body (left side in FIG. 6). The operating lever 60 is provided with a grip 60c that protrudes above the handle 60b. As described above, since the grip 60c is provided on the operation lever 60, the operation lever 60 can be easily operated in the front-rear direction from the front side of the machine body. Thereby, operability can be improved.

  Moreover, it is preferable that the grip part 60c is provided so that it may become substantially perpendicular | vertical. Thus, the arm ratio can be increased because the grip portion 60c is located above the handle portion 60b. Thereby, the load applied to the operation lever 60 can be reduced. Further, in this case, the lock release lever 61 is provided with a handle portion 61a that is bent at a substantially right angle from the straight portion. The lock release lever 61 is disposed inside the operation lever 60 in plan view.

<Drive shaft 46 of leveling device 40>
Next, the leveling device (leveling rotor) 40 will be described with reference to FIGS. Hereinafter, the drive shaft 46 of the leveling device (leveling rotor) 40 will be mainly described. 8 and 9 are explanatory views of the leveling device (leveling rotor) 40. FIG. FIG. 10 is an explanatory diagram of a modified example of the leveling device (leveling rotor) 40. 8 to 10 show a left side view of the leveling device (leveling rotor) 40. FIG. 12 is a schematic perspective view of the protection member 48 of the drive shaft 46.

  As shown in FIG. 8, the seedling transplanter 1 that is a work vehicle includes a seedling planting unit 30, a leveling rotor 40, and a drive shaft (also referred to as “transmission shaft”) 46 at the rear of the machine body. As described above, the leveling rotor 40 is rotationally driven by the power transmitted from the engine via the drive shaft 46. Further, as shown in FIG. 9, the seedling transplanter 1 includes a seedling planting part lifting mechanism 20 and a lifting link 21 at the rear part of the machine body. As shown in FIG. 9, the seedling transplanter 1 further includes a rod member 45, an angle changing mechanism 47 b, and a hanging member 49.

  The rod member 45 is a member that pushes down the leveling rotor 40 downward. As shown in FIG. 9, for example, when the leveling rotor 40 is a so-called single rotor composed of one, the rod member 45 is located behind the drive shaft 46. The connected rear case (also referred to as “drive shaft case”) 40 a is connected to the elevating link 21. In this case, by forming the hole 21a for connecting the rod member 45 to the elevating link 21 with a large diameter, even if the leveling rotor 40 swings in the left-right direction by rolling, the swing can be absorbed. Thereby, the structure where the leveling rotor 40 does not mechanically lock can be obtained at low cost.

  The drive shaft 46 transmits the rotational power from the engine to the leveling rotor 40 as described above. The drive shaft 46 is provided so as to be expandable and contractable in the axial direction by an expansion and contraction mechanism. The distal end side of the drive shaft 46 is connected to the main frame 5 side by a universal joint 47a so that the angle can be changed. In addition, the rear end side of the drive shaft 46 is connected to the leveling rotor 40 so that the angle can be changed three-dimensionally by an angle changing mechanism (universal joint) 47b. For this reason, the drive shaft 46 is freely bent with respect to the leveling rotor 40.

  In this way, the rear end side of the drive shaft 46 is connected to the leveling rotor 40 so that the angle can be changed by the universal joint 47b which is an angle changing mechanism, so that the seedling planting part lifting mechanism 20 and the seedling planting part are connected. For example, when 30 rolls left and right, the load applied to the drive shaft 46 can be reduced. Further, since the universal joint 47b is provided, the rod member 45 of the leveling rotor 40 can be fixed. For this reason, it is not necessary to provide a movable part etc. in the rod member 45, and a number of parts can be reduced. Thereby, the load applied to the drive shaft 46 can be reduced with an inexpensive configuration. In addition, the rod member 45 connects the lifting link 21 and the drive shaft 46, so that the seedling planting part 30 is raised, for example, restricting the extension / contraction mechanism of the drive shaft 46 to extend beyond a prescribed level, It is possible to prevent the drive shaft 46 from falling. In addition, by preventing the drive shaft 46 from falling, it is possible to prevent damage to a spline that is an expansion / contraction mechanism.

  As shown in FIG. 9, the rod member 45 includes two rod members, that is, a first rod 45a and a second rod 45b. The first rod 45 a is connected to the drive shaft 46 and connects the drive shaft case 40 a in which the rear end portion of the drive shaft 46 is accommodated and the elevating link 21. The first rod 45a is provided so that the rotation of the drive shaft 46 is restricted and the length can be adjusted. The second rod 45 b connects the front end portion of the drive shaft 46 and the elevating link 21. Similar to the first rod 45a, the second rod 45b is provided so that its length can be adjusted.

  In this way, the amount of bending of the drive shaft 46 can be reduced by connecting the drive shaft case 40a of the leveling rotor 40 and the elevating link 21 to restrict the drive shaft case 40a from rotating forward and lowering. it can. Thereby, breakage and wear of the drive shaft 46 can be suppressed. Further, the second rod 45b is provided at the front end portion of the drive shaft 46, and the lengths of the first rod 45a and the second rod 45b can be adjusted to minimize the bending amount of the drive shaft 46. The length of the two rods 45a and 45b can be adjusted according to individual differences of the aircraft. Further, the drive shaft 46 can be prevented from falling.

  Further, the first rod 45a and the second rod 45b are connected to the connecting portion between the drive shaft 46 and the leveling rotor 40 when the seedling planting portion 30 is most elevated and when it is most lowered. The length is set so that the maximum bending angle by the universal joint 47b which is an angle changing mechanism becomes equal. Thereby, the maximum bending angle by the universal joint 47b can be reduced.

  The rod member 45 (first rod 45a, second rod 45b) is provided with a turn buckle, so that the length of the rod member 45 can be easily adjusted. Further, for example, even if there is a variation in production, the length can be adjusted, so that the maximum bending angle can be reduced. In this case, for example, when the seedling planting part 30 is at the upper side and 35 degrees and the lower side is at 25 degrees, the maximum folding angle becomes smaller when the upper and lower sides are both 30 degrees and the rod is reduced. The durability of the member 45 is increased.

  Further, as shown in FIG. 10, the leveling rotor 40 is suspended from the elevating link 21 by suspension members 49a and 49b. Among these, the suspension member 49a is a rod-shaped member. Thus, even if the suspension member 49a is a rod-shaped member, the second rod 45b disposed at the front end portion of the drive shaft 46 regulates the bending angle of the universal joint 47b, which is an angle changing mechanism. It is possible to secure the allowance for the spline, which is the 49 expansion / contraction mechanism. The hanging member 49b is an urging member such as a spring, for example. A plurality of suspension members 49b may suspend and support the leveling rotor 40. In addition, it is good also as a structure which is not provided with the suspending member 49b, ie, a structure only of the suspending member 49a.

  As shown in FIG. 10, the drive shaft 46 is provided with a protection member 48 that protects the drive shaft 46. As shown in FIG. 11, the protection member 48 includes a bellows portion 48a and a cylindrical portion 48b. The protection member 48 is provided with a bellows portion 48a and a cylindrical portion 48b integrally. Thereby, cost reduction becomes possible. In addition, when the protection member 48 is attached to the drive shaft 46, the cylindrical portion 48b functions to hold the position of the bellows portion 48a. Can be prevented.

<Auxiliary step 70>
Next, the auxiliary step 70 will be described with reference to FIGS. 12 and 13. FIG. 12 is a schematic plan view of the auxiliary step 70. FIG. 13 is a schematic perspective view of the auxiliary step 70. 12 and 13 both show the right side of the aircraft. As shown in FIGS. 12 and 13, the seedling transplanter 1 that is a work vehicle is an auxiliary for the operator to move up and down to the control unit 14 (see FIG. 1) outside the body (main frame 5) in the left-right direction. Step 70 is provided.

  The auxiliary step 70 includes a step member (hereinafter referred to as “step plate”) 71 having a predetermined thickness, formed in a substantially rectangular shape in plan view, and formed in a lattice shape. Thus, since the step board 71 is a grid | lattice form, the mud etc. which adhered to the operator's shoes etc. can be dropped below the body. The step plate 71 preferably has a length in the front-rear direction of 100 mm or more and a length in the left-right direction of 30 mm or more, for example. Thereby, the worker can get on and off the control unit 10 safely.

  As shown in FIGS. 12 and 13, a plurality of protrusions 71 a are provided on the upper surface of the step plate 71. Thus, since the step plate 71 has a plurality of protrusions 71 a on the upper surface, it becomes difficult to slip when an operator puts his or her foot on the step plate 71.

  The auxiliary step 70 further includes an auxiliary frame 72, an auxiliary plate 73, and an auxiliary member 74. The auxiliary frame 72 is bent and formed in a U shape, and is fixed to the main frame 5 by welding, and a bent portion extends obliquely downward on the outer side of the main frame 5 in the left-right direction. As shown in FIG. 12, the auxiliary plate 73 is an L-shaped plate and is provided in the auxiliary frame 72 in plan view. The auxiliary plate 73 is fixed to the auxiliary frame by welding. Further, a hole 73 a is formed on the upper surface of the auxiliary plate 73.

  The step plate 71 is disposed on the auxiliary frame 72 and the auxiliary plate 73, and a fixing member 75 such as a bolt is attached to the hole 73 a of the auxiliary plate 73. Fixed to the top surface. The auxiliary member 74 is formed in a rod shape, and is provided in a rod shape extending in the left-right direction below the main frame 5. The auxiliary member 74 (hereinafter referred to as “auxiliary rod”) 74 is fixed to the auxiliary plate 73 by welding while the left and right side end portions are in contact with the inner surface of the step plate 71 provided on the left and right, respectively.

  As described above, since the auxiliary step 70 is composed of the step plate 71, the auxiliary frame 72, the auxiliary plate 73, and the auxiliary rod 74, the strength of the auxiliary step 70 can be improved. Further, since the auxiliary frame 72 is U-shaped and the step plate 71 provided on the auxiliary frame 72 has a lattice shape when viewed from the top (planar), the visibility can be improved such that the ground can be seen from above. Can do. Further, the step plate 71 is firmly fixed by the fixing member 75 attached to the hole 73 a of the auxiliary plate 73. In addition, since the inner surface of the step plate 71 is in contact with the auxiliary rod 74 extending in the left-right direction, even if a force is applied to the step plate 71 from the outside, the step plate 71 is not easily displaced. Thereby, the strength of the auxiliary step 70 can be improved.

  Moreover, since the auxiliary | assistant frame 72 is provided so that the step board 71 may be enclosed, it can prevent that an operator slides a leg | foot to the front-back direction. The hole 73a of the auxiliary plate 73 is, for example, a substantially hexagonal counterbore space. Since the hole 73a is counterbore, when the fixing member 75 is a bolt, the bolt (fixing member) 75 can be dropped into the hole 73a and fixed. Further, in this case, by attaching the nut from below, the step plate 71 can be firmly fixed and the assembly is facilitated.

  In addition, although the auxiliary step 70 is configured to be provided on both sides (outside) in the left-right direction of the airframe, it may be configured to be provided on only one of the left and right.

  Further effects and modifications can be easily derived by those skilled in the art. Thus, the broader aspects of the present invention are not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications can be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.

1 Work vehicle (seedling transplanter)
2 traveling vehicle body 3 front wheel 4 rear wheel 5 main frame 6 power transmission device 7 floor step 9 engine cover 10 cockpit 12 steering handle 13 planting lift lever 14 control unit 15 bonnet 15a front cover 16 handle unit 20 lifting mechanism (seed planting) Part lifting mechanism)
DESCRIPTION OF SYMBOLS 21 Lifting link 22 Lifting cylinder 30 Seedling planting part 31 Seedling mounting stand 32 Float 33 Seedling planting device 40 Leveling device (leveling rotor)
41 Fertilizer 42 Marker 45 Rod member 45a First rod 45b Second rod 46 Drive shaft 47b Angle changing mechanism (universal joint)
48 Protection member 49a Suspension member 49b Suspension member 50 Brake mechanism 51 Brake pedal 52 Support frame 53 Operation member (operation lever)
53a Rotation fulcrum 53b Handle portion 54 Brake lock mechanism 55 Lock member (lock pedal)
56 Unlocking member (Unlocking lever)
57 Lock pin 70 Auxiliary step 71 Step member (step plate)
72 Auxiliary frame 73 Auxiliary plate 73a Hole 74 Auxiliary member (auxiliary rod)
75 Fixing member (bolt)
A Aircraft front range

Claims (6)

A brake mechanism for stopping the airframe, a brake pedal supported by a support frame so as to be swingable in the front-rear direction, and operated when the brake mechanism is operated, and the brake pedal in a state where the brake mechanism is operated. A brake lock mechanism for locking, and an operation member that is extended to the front of the machine body and is operated when the brake mechanism is operated from the outside of the machine body,
The operating member is
When tilted forward and connected to the support frame and pivotable in the front-rear direction with the base end as a fulcrum, and the operating member is swung by operating the handle provided at the tip Further, the work vehicle is characterized in that the tip portion moves within a range of the front part of the fuselage. A lock member constituting the brake lock mechanism, which fixes the brake pedal at a position where the brake mechanism is operated;
A lock release member extending from the front of the machine body and releasing the brake pedal from the outside of the machine body by the lock member of the brake lock mechanism,
The unlocking member is
It is connected to the lock member and is swingable in the front-rear direction. The work vehicle according to claim 1, wherein the work vehicle is moved. The work vehicle according to claim 1, further comprising a handle portion that is provided at a central portion of the front end of the machine body and tilts forward with the machine body side as a fulcrum. A seedling planting section for planting seedlings loaded in the rear of the aircraft in the field;
A lifting link that supports the seedling planting portion so that it can be lifted and lowered at the rear of the body,
A leveling device for leveling the field;
A suspension member for suspending the leveling device from the lifting link;
A telescopic drive shaft for transmitting a driving force to the leveling device;
The work vehicle according to claim 1, further comprising an angle changing mechanism that connects the drive shaft to the leveling device so that the angle can be changed. A first rod that is connected to the drive shaft and accommodates a drive shaft case in which a rear end portion of the drive shaft is housed and an elevating link to adjust the length of the drive shaft to regulate the rotation of the drive shaft;
The work vehicle according to claim 4, further comprising a second rod whose length is adjustable that connects a front end portion of the drive shaft and the elevating link. It further includes auxiliary steps provided on the left and right sides of the main frame of the aircraft,
The auxiliary step includes
A U-shaped auxiliary frame extending obliquely downward on the outside of the main frame;
An auxiliary plate provided in the auxiliary frame and having a hole formed on the upper surface;
Step members fixed to the auxiliary plate through fixing members attached to the holes of the auxiliary plate at the upper part of the auxiliary frame and the auxiliary plate, and formed in a lattice shape in a top view;
An auxiliary member that extends in the left-right direction below the main frame and that has left and right end portions fixed to the auxiliary plate while being in contact with an inner surface of the step member. The work vehicle according to any one of the above.

Images