CN209914869U - Working vehicle - Google Patents

Abstract

The utility model provides an operation car makes the plant protection operation of the higher crop of plant height easy, makes the equipment operation of standard transmission case and extension support transmission case easy. The work vehicle is characterized in that a transmission part for transmitting driving force to the traveling wheels is formed, the transmission part is provided with an extension support transmission box (420) at the lower side of a standard transmission box (410), the standard transmission box (410) and the extension support transmission box (420) are connected by an insertion connection part (SL), and the standard transmission box (410) and the extension support transmission box (420) are fixed by a connection fixing part (BL) at the upper side of the insertion connection part (SL).

Description

Working vehicle

Technical Field

The utility model relates to an operation car. In particular, the present invention relates to a chemical liquid spreading work vehicle for spreading chemicals such as agricultural chemicals while traveling in a farm field.

Background

The chemical liquid spreading vehicle spreads the chemical liquid while crossing over the crops planted on the ridges of the farmland without trampling the crops, and therefore, the bottom surface of the machine body is located at a high position from the ground, and the transmission support legs of the machine body supported by the four-wheel-driven front and rear running wheels are lengthened.

For example, in a chemical liquid spreading work vehicle described in patent document 1, a transmission leg is constituted by a transmission case in which a drive shaft for transmitting power from front and rear axle housings on the body side is built and a support member, and front and rear running wheels are fitted to an axle of a tip housing provided at a lower end portion thereof.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2016-10332

The transmission support legs of the front and rear traveling wheels of the conventional chemical liquid spreading work vehicle are constituted by a transmission case with a built-in drive shaft and a support structural member, and therefore, are complicated and expensive to manufacture and assemble.

SUMMERY OF THE UTILITY MODEL

The present invention has been made in view of the above problems of the conventional chemical liquid spreading work vehicle, and an object of the present invention is to simplify the structure of the vertically long transmission support leg of the chemical liquid spreading work vehicle and reduce the manufacturing cost.

The above-described problems of the related art are solved by the following technical means.

The working vehicle according to claim 1 is characterized in that a transmission unit for transmitting a driving force to the traveling wheels is configured, the transmission unit is configured such that an extension support transmission case 420 is disposed below a standard transmission case 410, the standard transmission case 410 and the extension support transmission case 420 are coupled to each other by an insertion coupling portion SL, and the standard transmission case 410 and the extension support transmission case 420 are fixed to a coupling fixing portion BL on the upper side of the insertion coupling portion SL.

The working vehicle according to claim 2 is characterized in that, in addition to claim 1, a coupling fixing portion BL is formed on the side of the traveling wheel.

The working vehicle according to claim 3 is characterized in that the extension support transmission case 420 is located on the outer side in the left-right direction of the machine body as it goes downward, in addition to claim 1 or 2.

The utility model discloses have following effect.

According to the embodiment 1, the standard transmission case 410 and the extension support transmission case 420 are connected to each other, so that the height of the machine body above the ground is increased and plant protection work for a crop having a high plant height can be performed.

According to the means 2, when the machine body travels across crops or ridges, the connection fixing portion BL can be prevented from abutting against the crops or ridges.

According to the embodiment 3, the extension support transmission case 420 is located further outward in the left-right direction of the machine body as it goes downward, and therefore, the vehicle can stably travel in a farmland with many irregularities.

Drawings

Fig. 1 is a left side view of the chemical liquid spreading work vehicle.

Fig. 2 is a plan view of the chemical solution spreading work vehicle.

Fig. 3 is a front view of the chemical liquid spreading work vehicle.

Fig. 4 is a perspective view of the chemical solution spreading work vehicle viewed from the left obliquely front upper side.

Fig. 5 is a front view of the left front wheel-equipped belt of the left front wheel transmission.

Fig. 6 is a front view (partially in section) of the left front wheel-free transmission portion.

Fig. 7 is a front sectional view (partially cut) of the left front wheel-equipped belt of the left front wheel transmission portion.

Fig. 8 is a front sectional view of the left front wheel-free transmission portion of the left front wheel.

FIG. 9 is a cross-sectional view of the extension support gear box.

Fig. 10 is a plan view of a coupling body coupling the extension support transmission case and the tip housing.

Fig. 11 is an enlarged plan view of the periphery of the driver's seat.

FIG. 12 is an enlarged side view of the main shift lever.

Fig. 13 is a plan view of a main frame from which an engine cover and a driver's seat are omitted.

Fig. 14 is a plan view of the main frame.

Fig. 15 is an enlarged plan view of the main frame.

In the figure: 1-liquid medicine broadcasting operation vehicle, 3L, 3R-front wheel, 4L, 4R-rear wheel, 7-driver's seat, 8-steering wheel, 21-driving control panel, 21 a-stepless gear shift (main gear shift), 21 b-auxiliary gear shift, 30-hydraulic stepless gear shift, 31-working oil tank, 33-main frame, 33L-left main frame, 33R-right main frame, 39-battery, 100C-central broadcasting cantilever mechanism, 100L-left broadcasting cantilever mechanism, 100R-right broadcasting cantilever mechanism.

Detailed Description

Hereinafter, a chemical liquid spreading work vehicle according to an embodiment of the chemical liquid spreading work vehicle according to the present invention will be described with reference to the drawings. In the description of the embodiments, the left and right directions in the forward direction of the machine body are referred to as the left and right directions, respectively, and the forward direction is referred to as the forward and backward directions as the backward direction, respectively, but the configuration of the present invention is not limited thereto.

First, the chemical liquid spreading work vehicle 1 of the present embodiment, its schematic configuration and operation will be described with reference to fig. 1 to 4.

Fig. 1 is a left side view of a liquid medicine spreading work vehicle 1 according to an embodiment of the present invention, and fig. 2 is a plan view of the liquid medicine spreading work vehicle 1 according to the embodiment of the present invention. Fig. 3 is a front view of the chemical liquid spreading work vehicle 1 according to the embodiment of the present invention. Fig. 1 to 3 show a state (storage posture) in which left and right broadcast arm mechanisms (described later) are stored in both left and right side surfaces of the traveling vehicle body.

Fig. 4 is a perspective view of the chemical liquid spreading work vehicle 1 according to the embodiment of the present invention, as viewed from the front obliquely from the left and upward. Fig. 4 shows a state in which the left sowing boom mechanism 100L is stored in the left side surface of the traveling vehicle body (storage posture) and a state in which the right sowing boom mechanism 100R is extended to the right side of the traveling vehicle body (sowing posture).

Note that, in fig. 3, the central broadcast boom mechanism 100C to be described later is not shown, and in fig. 4, the central broadcast boom mechanism 100C and the left broadcast boom mechanism 100L are not shown.

As shown in fig. 1 and 2, the chemical liquid spreading work vehicle 1 of the present embodiment includes: an engine 6 covered with an engine cover 5 at a front portion of a main frame 33 having a pair of left and right front wheels 3L, 3R and a pair of left and right rear wheels 4L, 4R; a driver seat 7 disposed at a substantially central portion of the main frame 33; a steering wheel 8 disposed in front of the driver seat 7; and a plant protection chemical liquid tank 9 for storing chemical liquid, which is disposed at the rear part of the main frame 33 so as to surround from three sides, i.e., the left and right sides and the rear side of the driver's seat 7 in a plan view.

Further, a plant protection pump 10 is provided on the main frame 33 below the plant protection chemical liquid tank 9. Further, a carrier 51 is provided behind the plant protection chemical liquid tank 9, and a metal or resin portable tank 12 can be placed thereon. The portable tank 12 includes a tank for containing water, a tank for containing fuel, and a tank for containing a drug. When water is contained, the water is put into the plant protection chemical liquid tank 9 at the end of the operation (in a state where no chemical liquid is present in the plant protection chemical liquid tank 9), and the water is sprayed from the nozzle 101 to clean the piping of the plant protection spraying device 100. In addition, the present invention can be used for mounting a spare fuel tank or a medicine tank.

A plant protection broadcast device 100 is provided on the front side of the main frame 33.

The plant-protecting spreading device 100 includes a central spreading arm mechanism 100C disposed in front of the main frame 33, and a pair of left and right spreading arm mechanisms 100L, 100R rotatably provided on both front left and right end sides of the main frame 33. Further, the pair of left and right broadcast arm mechanisms 100L and 100R are provided with a pair of left and right hydraulic rotating cylinders 110L and 110R for rotating a pair of left and right broadcast arms 120L and 120R, which will be described later, via a pair of left and right rotating portions 300L and 300R. The pair of left and right rotating portions 300L and 300R are rotatably attached to both left and right ends of a front horizontal stay 220 described later.

Further, a lifting link mechanism 200 for lifting and lowering the plant seed sowing device 100 is provided on the front side of the main frame 33.

As shown in fig. 1, 2, and 4, the lifting link mechanism 200 includes: a pair of right and left parallel links 210L, 210R rotatably disposed on the right and left sides of the engine cover 5; a front horizontal stay 220 disposed in front of the engine cover 5 and fixed by welding to front end portions of the pair of left and right parallel links 210L, 210R; and a hydraulic lift cylinder 230 for raising and lowering the front horizontal strut 220. The hydraulic lift cylinder 230 is constructed of one, and thus has a simple structure and a light weight.

As shown in fig. 1, the left parallel link 210L includes: an upper link 210La and a lower link 210Lb on the left side; a left link first connecting member 211L that rotatably connects rear end portions of the left upper link 210La and the left lower link 210Lb with a predetermined space therebetween and has a lower end portion fixed to the left side (left side in the vehicle width direction) of the main frame 33; and a left link second coupling member 212L that rotatably couples the distal end portions of the left upper link 210La and the left lower link 210Lb with a predetermined gap therebetween.

The right parallel link 210R and the left parallel link 210L have the same configuration.

The above-described front horizontal strut 220 is welded and fixed to the lower end portion of the front side surface of the left link second coupling member 212L and the lower end portion of the front side surface of the right link second coupling member 212R, and the left-right width of the front horizontal strut 220 is longer than the left-right interval between the left parallel link 210L and the right parallel link 210R, and has a length approximately equal to the inter-wheel distance (tread distance) between the left and right front wheels 3L, 3R.

The left lower link 210Lb and the right lower link 210Rb are coupled by a left link coupling arm 213 in the vicinity of a substantially middle position of the front horizontal strut 220 and the front end portion of the engine cover 5 in a side view.

The main body of the hydraulic lift cylinder 230 is rotatably mounted to the upper end of a cylinder mounting bracket 232 erected at the center of the left-right width of the front horizontal strut 220, and the front end of a piston rod 231 of the hydraulic lift cylinder 230 is coupled to the left-right link coupling arm 213.

Thus, when the piston 231 of the hydraulic lift cylinder 230 moves in the extension direction, the pair of left and right parallel links 210L and 210R move up with the connection portion of the left link first connection member 211L and the right link first connection member 211R as the pivot shaft and the tip end side thereof moves up, and therefore the front horizontal strut 220 also moves up at the same time.

When the piston rod 231 of the hydraulic lift cylinder 230 moves in the retracting direction, the pair of left and right parallel links 210L and 210R are lowered with the connecting portion between the left link first connecting member 211L and the right link first connecting member 211R as a pivot shaft, and therefore the front horizontal strut 220 is also lowered at the same time.

According to the above configuration, by operating the left broadcast boom pivot switch and the right broadcast boom pivot switch (not shown) and operating the pair of left and right hydraulic rotary cylinders 110L and 110R (see fig. 1), the operation posture in which the pair of left and right broadcast booms 120L and 120R are projected in the left-right direction of the main frame 33 and the storage posture in both sides of the chemical solution broadcast operation vehicle 1 can be switched (see fig. 1, 2, and 3).

Further, according to the above configuration, the height of the chemical solution can be changed by raising and lowering the plant protection broadcasting device 100 by the hydraulic lift cylinder 230 (see fig. 1).

The chemical in the plant chemical tank 9 is sent to the plant broadcast device 100 by the plant pump 10, and is broadcast from a plurality of broadcast nozzles 101 (see fig. 2) provided in the central broadcast arm mechanism 100C, the left broadcast arm mechanism 100L, and the right broadcast arm mechanism 100R, respectively. Specifically, the broadcast nozzle 101 is provided in plurality at predetermined intervals to the left pipe 121L and the right pipe 121R, and the left pipes 121L and 121R are fixed along the broadcast cantilevers 120L and 120R. In the central broadcast arm mechanism 100C, a plurality of broadcast nozzles 101 are provided at predetermined intervals to the front pipe 121C, and the front pipe 121C is fixed along the front broadcast arm 120C.

Fig. 11 is an enlarged plan view of the driver seat 7, and a boom operation switch 32 for raising and lowering the left broadcast boom mechanism 100L and the right broadcast boom mechanism 100R, an engine tachometer 15, and a vehicle speed meter 16 are provided on the upper surface of the steering column 14 on which the steering wheel 8 is erected, in front of the driver seat 7.

Left and right brake pedals 17L and 17R are provided on pedal 13 on the left and right sides of steering column 14.

A broadcast control panel 20 is provided on the right side of the driver seat 7, and a travel control panel 21 is provided on the left side. A pump switch 20a and a pressure adjustment dial 20C for turning on and off the plant protection pump 10 are provided on the upper surface of the broadcast control panel 20, a mixing switch 20b is provided on the inner surface of the broadcast control panel 20, and a left lowering switch 24L of the left broadcast arm mechanism 100L, a center lowering switch 24C of the center broadcast arm mechanism 100C, and a right lowering switch 24R of the right broadcast arm mechanism 100R are provided on the front surface so as to be lowered in a downward direction, respectively.

A PTO lever 36 and a differential lock pedal 37 are provided between the broadcast control panel 20 and the driver's seat 7.

A travel control panel 21 is provided on the left side of the driver seat 7, and a main shift lever 22 and a sub-shift lever 23 are provided upright. The main shift lever 22 shifts the speed of the hydraulic continuously variable transmission 30 mounted between the left main frame 33L and the right main frame 33R, and is connected to a trunnion 32a of the hydraulic continuously variable transmission 30 by a link 22a and a tie rod 22b as shown in fig. 13, and shifts the traveling speed from forward and backward through neutral stop. The sub-shift lever 23 performs an operation of switching the shift range of the main shift lever 22 to the high-low range.

Cantilever support arms 27L and 27R are provided on the left and right of the rear portion of the plant protection chemical liquid tank 9, and a jet pump switch JS is provided on the right rear portion.

Next, the left front wheel transmission unit 400L shown in fig. 1 and 3 will be explained. The right front wheel transmission unit 400R and the left front wheel transmission unit 400L are symmetrical to each other, and therefore, the description thereof is omitted. The left rear wheel transmission part 500L and the right rear wheel transmission part 500R have the same configurations as the left front wheel transmission part 400L and the right front wheel transmission part 400R, respectively, and therefore, the description thereof is omitted.

Fig. 5 shows a front view of the left front wheel transmission 400L with the left front wheel 3L, and fig. 6 shows a front view (partially cut-away) of the left front wheel transmission 400L without the left front wheel 3L. Fig. 7 shows a front sectional view (partially cut) of the left front wheel transmission unit 400L with the left front wheel 3L, and fig. 8 shows a front sectional view of the left front wheel transmission unit 400L without the left front wheel 3L.

The left front wheel transmission unit 400L and the right front wheel transmission unit 400R are coupled to both left and right end portions of the front axle 500F (see fig. 3). The left rear wheel transmission unit 500L and the right rear wheel transmission unit 500R are coupled to both right and left end portions of the rear axle 900R (see fig. 4), but have the same configuration.

The left front wheel transmission section 400L is composed of a standard transmission case 410, an extension support transmission case 420, and a tip end housing 430. A drive shaft 700 for driving the left front wheel 3L is housed in the standard transmission case 410, the extension support transmission case 420, and the end case 430. The drive shaft 700 is a common member for driving the left and right front wheels 3L, 3R and the left and right rear wheels 4L, 4R. As shown in fig. 6 to 8, power is transmitted from the lower portion of the drive shaft 700 to the axle 703 via a bevel gear 701 and a bevel gear 702.

In the standard machine, the right and left front wheel transmission units 400L, 400R and the right and left rear wheel transmission units 500L, 500R are constituted only by the standard transmission case 410 and the end case 430, but the distance from the agricultural surface to the front axle 500F and the rear axle 900R is made longer (high-pitch prototype) by connecting the extension support transmission case 420 to each standard transmission case 410. This enables the vehicle to travel with a high ridge height or over long crops. In addition, the mounting configuration of the standard gear box 410 and the end housing 430 that extends to support the gear box 420 are identical.

A standard gear box 410 is inserted into an upper hole 422 (see fig. 9) of the extension support gear box 420, and an upper bearing 601 and a lower bearing 602 are interposed between the extension support gear box 420 and the standard gear box 410. An oil seal 600 (see fig. 7) is provided at an upper end of the extension support transmission case 420 to prevent oil from leaking inside and dust from entering from the outside.

Further, an upper protrusion 421 is formed on the upper side of the extension support transmission case 420 and on the left front wheel 3L side, and a tapped hole 421a for inserting a bolt at 4 positions and a hole 421b for a knock pin at 1 position are formed. On the other hand, on the standard transmission case 410 side, 4 bolt passing holes 410a are formed at positions facing the bolt insertion tapped holes 421a, and a knock pin hole 410b is formed at a position facing the knock pin hole 421 b. The standard transmission case 410 and the extension support transmission case 420 are positioned by inserting the knock pin KP into the knock pin hole 421b and the knock pin hole 410 b. Then, the connection is performed by 4 bolts 410 c.

Since the coupling fixing portion (bolt coupling portion) BL is formed above the standard transmission case 410 and the insertion coupling portion SL of the extension support transmission case 420, which are the upper side of the extension support transmission case 420, and a part of the bolt coupling portion BL is disposed above the oil seal 600, the upper bearing 601, and the lower bearing 602 in a front view, the coupling operation can be performed without being hindered by the front wheels 3L and 3R and the rear wheels 4L and 4R because of a compact configuration. The upper projection 421 does not abut on a crop or a ridge that is crossing over.

The tip housing 430 includes a flange portion 430a and a receiving portion 430 b.

An axle 703 to which the left front wheel 3L is attached is pivotally supported by the flange portion 430a, a plurality of bolt holes are formed substantially circumferentially in the flange portion 430a, and the axle is attached to the receiving portion 430b by a plurality of bolts 430 c. In addition, a receiving hole 430d is formed in the receiving portion 430b, into which the lower portion of the extension support gear box 420 is inserted. At this time, the protrusion 420a formed on the outer circumference of the extension support gear box 420 is positioned in contact with the entrance of the receiving hole 430d of the receiving portion 430 b.

Further, the receiving unit 430b and the extension support gear box 420 are coupled by a coupling body 800 so that the extension support gear box 420 does not rotate, i.e., so as to be synchronized with the steering of the left front wheel 3L. Fig. 10 is a left side view of the connecting member 800. A flat surface 430e that is long in the front-rear direction is formed on the upper portion of the receiving portion 430b, and a flat surface on the lower portion of the connecting body 800 is placed on the flat surface 430 e. Then, the bolts 801 are fastened by 4 bolts.

A flat surface 420b that is long in the front-rear direction is formed on the surface of the left side surface of the extension support gear box 420, and a flat surface of the upper portion of the connecting member 800 is placed on the flat surface 420 b. Then, the two are connected by 4 bolts 802.

Accordingly, since the tip case 430 and the extension support gear case 420 are integrally configured, the extension support gear case 420 can be prevented from rotating on its own axis, and the durability of the oil seal 600 can be improved.

Further, a boss 803 is formed in the coupling body 800 to form a hole for tapping a bolt. On the other hand, a boss portion 420c is formed on the extension support gear case 420 side, and a hole for tapping a bolt is formed. The coupling plate LP is coupled between the boss 803 and the boss 420c and fixed by a bolt 804 (see fig. 6). As shown in fig. 5, the boss 803, the boss 420c, and the connecting plate LP are configured on the forward direction side with respect to the extension support transmission case 420, but may be configured on the backward direction side.

Thus, the coupling structure of the tip housing 430 and the extension support gear box 420 is strong.

Fig. 13 is a plan view of the main frame 33 of the chemical solution spreading work vehicle 1, and fig. 14 is a plan view of only the main frame 33.

The main frame 33 is constituted by a left main frame 33L and a right main frame 33R. The left main frame 33L and the right main frame 33R are disposed in parallel from the front to the rear of the vehicle body 2, and the engine 6, the transmission case 30A integrated with the hydraulic continuously variable transmission 30, the plant protection pump 10, and the plant protection chemical liquid tank 9 are mounted on the main frames 33 in this order from the front of the vehicle body 2. In this way, important functional components are mounted on the left and right main frames 33L and 33R and supported and fixed, so that the assembling can be easily performed and the assembling man-hours can be reduced. In addition, the assembly position is easy to distinguish, and the error installation can be prevented. Further, since the use of the left and right main frames 33L and 33R eliminates the need for another support structure for supporting the functional components, the number of components can be reduced, and a lightweight and inexpensive structure can be obtained.

The left and right main frames 33L and 33R are formed of hollow angle members, and the engine 6 is mounted on an engine board 34 provided in front of the left and right main frames 33L and 33R. The engine plate 34 is composed of left and right engine plates 34L, 34R, and is fixed to the left and right main frames 33L, 33R by welding. The engine plate 34 is formed to have a thick wall in order to improve the mounting strength. The left engine plate 34L is welded and fixed to the left main frame 33L, and the right engine plate 34R is welded and fixed to the right main frame 33R.

The engine plate 34 may be attached by bolts and nuts, but the number of parts is reduced by welding instead, and the bolts are not loosened even if an excessive load is applied. Further, the front end portions of the left and right engine plates 34L, 34R are connected by the front engine frame 34a, so that the strength is further improved. A counterweight for correcting the front-rear balance is locked to the front engine frame 34 a.

A liquid plant medicine tank 9 is mounted on the rear portions of the left and right main frames 33L, 33R, and a transmission case 30A for changing the speed of transmission from the engine 6 and a plant protection pump 10 for delivering a liquid medicine from the liquid plant medicine tank 9 to the broadcast arm mechanisms 100L, 100R, 100C are mounted between the left and right main frames 33L, 33R between the engine 6 and the liquid plant medicine tank 9. The plant protection pump 10 is heavy in weight for discharging a large amount of liquid medicine, and conventionally, the plant protection pump 10 is provided at the rear of the machine body to balance the machine body, but such a problem can be solved.

The left and right lower links 35L, 35R and the left and right upper links 36L, 36R that support the left and right broadcast arm mechanisms 100L, 100R are attached to the left and right mounting brackets 37L, 37R. The left and right mounting brackets 37L, 37R are welded and fixed to the left and right engine boards 34L, 34R, respectively. As shown in fig. 14, the engine 6 is disposed on an engine plate 34 in front of the left main frame 33L and the right main frame 33R, and the engine plate 34 is coupled to the left main frame 33L and the right main frame 33R. This strengthens the main frame 33 by the engine plate 34 serving as a reinforcement of the main frame 33 itself.

This reduces the number of assembly steps and the number of parts compared to conventional bolt and nut assembly, and also improves the strength. The left attachment bracket 37L is integrally formed by welding the horizontal frame 37La and the concave vertical plate 37 Lb. The right mounting bracket 37R is also of the same construction.

Reference numeral 38 denotes a battery mounting table for mounting a battery 39. The battery mounting table 38 is integrally formed with the lateral frame 37La of the left mounting bracket 37L by welding. And, a distance D1 is spaced from the left engine board 34L. In the conventional battery arrangement position, since the mounting table is configured and mounted inside the ascending/descending step, not only is the safety check troublesome, but also there is a problem that the chemical solution dropped from the chemical solution tank 9 drops to the battery 39. However, by configuring the battery 39 as described above, the maintenance of the battery 39 itself and the engine cover on the side of the engine is improved. Further, the chemical liquid dropped from the plant chemical liquid tank 9 does not spread to the battery 39. Further, the hydraulic oil tank 31 and the battery 39 of the hydraulic continuously variable transmission 30 attached to the tank suspension frame 28 of the right main frame 33R are balanced in weight in the left-right direction, and stable in traveling.

As shown in fig. 15, the hydraulic continuously variable transmission device 30 is mounted on the front side of the transmission case 30A at a position sandwiched by the left main frame 33L and the right main frame 33R. As shown in fig. 13, the plant protection pump 10 is mounted on a main frame 33 behind the transmission case 30A, and is driven from the transmission case 30A via a belt 10A. The tank suspension frame 28 is welded to the right side surface of the right main frame 33R, the hydraulic oil tank 31 is suspended and mounted on the bottom thereof, and the pipe 42 facing the hydraulic continuously variable transmission 30 is mounted on the side surface of the right main frame 33R. The battery 39 is mounted on the left side surface of the left main frame 33L, and the hydraulic oil tank 31 mounted on the right main frame 33R and the battery 39 mounted on the battery mounting table 38 of the left main frame 33L are arranged diagonally, so that the left-right weight balance is improved. An oil supply port 31a is provided on an outward downward inclined surface of the operating oil tank 31.

As shown in fig. 13, a plant protection chemical liquid tank holding body 10b is provided on the left and right sides of the rear part of the plant protection chemical liquid tank 9. Further, a rear support member 50 for supporting the bottom portion of the rear portion of the plant protection chemical liquid tank 9 is integrally fixed to the rear end portions of the left and right main frames 33L, 33R by welding, and the carrier 51 is attached to the rear support member 50 by bolts 51 a. The liquid chemical tank holder 10b on the left and right sides of the rear portion of the liquid chemical tank 9 is pressed by a liquid chemical tank presser 51b formed on the carrier 51, thereby holding the front and rear positions of the liquid chemical tank 9. That is, the carrier 51 prevents the plant protection chemical liquid tank 9 from moving backward and shifting when the machine body rapidly moves forward.

Reference numeral 44 shown in FIG. 14 denotes a bottom support member for supporting the bottom of the liquid drug storage tank 9, and is shaped like a long angle. A recess (not shown) is formed in the bottom of the liquid drug storage tank 9, and the bottom support member 44 is inserted into the recess of the bottom of the liquid drug storage tank 9 to hold the horizontal position of the liquid drug storage tank 9.

The left and right bottom support members 44L, 44R extend outward from the machine body than the rear axle housing fixing portion 45. And extends to the side of the plant protection pump 10 toward the front of the machine body. The end of the right bottom support member 44R is connected to the front and rear plates 46, and the front and rear plates 46 are connected to the mounting base members 40 of the left and right opening/closing levers 18L, 18R. The front and rear plates 46 and the right main frame 33R are coupled by a plurality of reinforcing plates 47.

A fuel tank is placed on the plurality of reinforcing plates 47. Further, a plurality of reinforcing plates 47 are also provided on the left main frame 33L side, and a fuel tank is placed thereon.

The end of the left bottom support member 44L is coupled to a reinforcing plate 48, and the reinforcing plate 48 couples the left main frame 33L and the left bottom support member 44L. Further, reference numeral 49 also denotes a reinforcing plate that connects the left main frame 33L and the left bottom support member 44L. The left and right bottom support members 44L, 44R are conventionally configured to extend to the vicinity of the driver's seat in the front of the machine body, but this time, the structure is made shorter, the weight is reduced, and the cost is reduced.

As described above, the rear supporting member 50 integrally fixedly supports the bottom portion of the rear portion of the plant protection chemical liquid tank 9 at the rear end portions of the left and right main frames 33L, 33R by welding.

Further, the bottom support member 44 that supports the bottom of the plant chemical liquid tank 9 also functions as the tank suspension frame 28.

Claims (3)

1. A working vehicle is characterized in that,

the transmission unit is configured to transmit a driving force to the traveling wheels, the extension support transmission case (420) is disposed below the standard transmission case (410) in the transmission unit, the standard transmission case (410) and the extension support transmission case (420) are coupled by an insertion coupling portion (SL), and the standard transmission case (410) and the extension support transmission case (420) are fixed by a coupling fixing portion (BL) located above the insertion coupling portion (SL).

2. The work vehicle of claim 1,

a connection fixing part (BL) is formed on the traveling wheel side.

3. Work vehicle according to claim 1 or 2,

the extension support transmission case (420) is configured to be located outside the machine body in the left-right direction as going downward.

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