Work vehicle

Abstract

To provide an inexpensive work vehicle having a simple configuration capable of reducing an intake air temperature of an air cleaner inside a front cover in order to solve a problem that, in a rice field work machine equipped with an engine inside the front cover in a front portion of a travel vehicle body, when the intake air temperature of the air cleaner provided inside the front cover is high, horsepower loss of the engine occurs, so that an electric fan dedicated to discharging hot air to the outside of the front cover is provided in order to reduce the intake air temperature of the air cleaner.SOLUTION: In a work vehicle, a radiator 21, an air cleaner 22, and an engine are provided in a cover 15 of a travel vehicle body 2. A distal end portion of a suction pipe 22a of the air cleaner 22 is arranged in a suction side of a vehicle outside of the radiator 21.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a work vehicle such as a riding rice transplanter. [Background technology]

[0002] There is a paddy field working machine that has an engine mounted inside a front cover at the front of the traveling body (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-357515 Summary of the Invention [Problem to be solved by the invention]

[0004] If the intake temperature of the air cleaner installed inside the front cover was high, it would result in a loss of engine horsepower, so a dedicated electric fan was installed to exhaust hot air outside the front cover to lower the intake temperature of the air cleaner.

[0005] The present invention has been made in view of the above, and has an object to provide a work vehicle with an inexpensive and simple configuration that can reduce the intake temperature of the air cleaner inside the front cover. [Means for solving the problem]

[0006] The invention described in claim 1 is a work vehicle in which a radiator 21, an air cleaner 22 and an engine 12 are provided within a cover 15 of a running body 2, and the tip of the intake pipe 22a of the air cleaner 22 is arranged on the intake side of the radiator 21 on the outer side of the vehicle body.

[0007] According to the invention described in claim 1, the tip of the intake pipe 22a of the air cleaner 22 is arranged on the intake side of the radiator 21 on the outer side of the vehicle body, so that the air cleaner 22 draws in outside air, thereby making it possible to obtain an inexpensive and simply configured work vehicle with a lower intake air temperature.

[0008] The invention described in claim 2 is a work vehicle described in claim 1, in which a shielding member 24 with an open bottom is provided in the gap between the cover 15 and the radiator 21, and the tip of the intake pipe 22a is arranged within the shielding member 24.

[0009] According to the invention described in claim 2, the shielding member 24 prevents air heated by the exhaust heat of the engine 12 from reaching the tip of the intake pipe 22a, allowing the air cleaner 22 to appropriately draw in low-temperature air.

[0010] Furthermore, since the bottom of the shielding member 24 is open, low-temperature outside air can be taken in from below, and the air cleaner 22 can also suck in low-temperature air.

[0011] The invention described in claim 3 is a work vehicle described in claim 1 or claim 2, in which the tip of the intake pipe 22a is provided so as to cover the reinforcing portion 23a of the cover 15 when viewed from the outside, and the tip of the intake pipe 22a is cut diagonally to open so that the outer side is longer.

[0012] According to the invention as set forth in claim 3, when air is taken in from the tip end of the intake pipe 22a, water and the like are hardly sucked in, and good air intake can be achieved. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a side view of a riding rice transplanter according to an embodiment of the present invention. [Figure 2] FIG. 2 is a side view showing the main parts of the front of the traveling body of the riding rice transplanter. [Figure 3] FIG. [Figure 4] 10A and 10B are explanatory views of the operation of an intake pipe showing another embodiment of the present invention. [Figure 5] 10A and 10B are explanatory views of the operation of a muffler portion showing another embodiment of the present invention. [Figure 6] 10A and 10B are explanatory views of the operation of a muffler showing another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0014] Preferred embodiments of the present invention will now be described with reference to the drawings.

[0015] <Overall structure> FIG. 1 is a side view of a riding rice transplanter with a fertilizer applicator, which is one embodiment of the work vehicle of the present invention.

[0016] In the riding rice transplanter 1 with fertilizer applicator, a seedling planting unit 4 is attached to the rear of the traveling body 2 via a lifting link device 3 that is raised and lowered by a lifting hydraulic cylinder 3a, and the main body of the fertilizer applicator 5 is provided on the upper rear of the traveling body 2. The left and right directions of the riding rice transplanter 1 as viewed in the forward direction are referred to as left and right, respectively, and the forward and backward directions are referred to as front and rear, respectively.

[0017] <Running vehicle 2> The traveling vehicle body 2 is a four-wheel drive vehicle equipped with a pair of left and right front wheels 6,6 and a pair of left and right rear wheels 7,7 which are drive wheels, and a transmission case 8 is arranged at the front of the vehicle body, front wheel final cases 9,9 are provided on the left and right sides of the transmission case 8, and the left and right front wheels 6,6 are respectively attached to left and right front wheel axles which protrude outward from each front wheel support part of the left and right front wheel final cases 9,9 which can change the steering direction.

[0018] In addition, the front end of the main frame 10 is fixed to the back of the transmission case 8, and rear wheel gear cases 11, 11 are supported so as to be able to roll freely, with a rear wheel rolling axis set horizontally in the center of the rear end of the main frame 10 as a fulcrum, and rear wheels 7, 7 are attached to the rear wheel axles that protrude outward from the rear wheel gear cases 11, 11.

[0019] The engine 12 is mounted at the front of the aircraft, and the rotational power of the engine 12 is transmitted to the transmission case 8 via a belt transmission and an HST.

[0020] The rotational power transmitted to the transmission case 8 is changed in speed by the transmission inside the transmission case 8, and then separated into running power and externally extracted power.

[0021] A portion of the running power is transmitted to the front wheel final cases 9,9 to drive the front wheels 6,6, and the remainder is transmitted to the rear wheel gear cases 11,11 to drive the rear wheels 7,7.

[0022] In addition, the externally extracted power is transmitted to a planting clutch case provided at the rear of the traveling body 2, and then transmitted to the seedling planting section 4 by a planting transmission shaft, and also transmitted to the fertilizer application device 5 by a fertilizer application transmission mechanism.

[0023] The rear of the traveling vehicle body 2 is covered with a rear cover 13, and a seat 14 is installed on top of it.

[0024] In front of the seat 14 is a front cover 15 incorporating various operating mechanisms, and above the front cover 15 is provided a handle 16 for steering the front wheels 6,6.

[0025] The left and right sides of the lower ends of the rear cover 13 and the front cover 15 form horizontal floor steps 17. Part of the floor step 17 is lattice-shaped so that mud on the shoes of an operator walking on the floor step 17 falls into the field. The rear part above the floor step 17 is a rear step 18 that also serves as a rear wheel fender.

[0026] A base of a front support pillar 19 is fixed to the front of the traveling vehicle body 2, and a GPS receiver 20 is provided at the upper end of the front support pillar 19.

[0027] The engine 12 and its surroundings will now be described with reference to FIGS.

[0028] The engine 12 is disposed within a front cover 15 .

[0029] A radiator 21 is provided on the right side of the engine 12 inside the front cover 15, and an air cleaner 22 is provided above the engine 12.

[0030] The tip of an intake pipe 22a of the air cleaner 22 is disposed in the center of the right outer side of the radiator 21, and draws in outside air from the side that the radiator 21 draws in.

[0031] Therefore, although the air cleaner 22 is disposed inside the front cover 15, it takes in outside air from the side that the radiator 21 takes in, and since it draws in low-temperature air, it is possible to prevent horsepower loss in the engine 12.

[0032] Furthermore, in the past, the air cleaner 22 took in air from the upper part inside the front cover 15, and in order to lower the intake air temperature, an electric fan was provided inside the upper part of the front cover 15 to exhaust the exhaust heat of the engine 12 to the outside of the front cover 15, but this eliminates the need to provide such an electric fan, resulting in a simpler configuration and cheaper manufacturing.

[0033] In addition, an insulator 24, which is a U-shaped shielding member with an open bottom, is provided between the right side cover 23, which is a component of the front cover 15 that covers the right outside of the radiator 21, and the right outside surface of the radiator 21, and the tip of the intake pipe 22a is positioned inside the area surrounded by the insulator 24.

[0034] Therefore, the insulator 24 prevents air heated by the exhaust heat of the engine 12 from reaching the tip of the intake pipe 22a, allowing the air cleaner 22 to suck in cool air.

[0035] Furthermore, since the insulator 24 is open at the bottom, low-temperature outside air can be taken in from below, and the air cleaner 22 can also suck in low-temperature air.

[0036] The tip of the intake pipe 22a is cut obliquely so that the outer side is longer and opens downward.

[0037] Furthermore, the right side cover 23 has a wire mesh stretched over the entire surface to allow outside air to be drawn in, and a reinforcing portion (reinforcing plate) 23a is provided in the center, and the tip of the intake pipe 22a is positioned inside the reinforcing portion (reinforcing plate) 23a in a position hidden when viewed from the outside.

[0038] Therefore, when air is drawn in from the tip of the intake pipe 22a, water and the like are less likely to be drawn in, and good air intake can be achieved.

[0039] Furthermore, if a shielding cover is provided on the top of the radiator 21 and the engine 12 side and the right outer side of the radiator 21 where the tip of the intake pipe 22a is located are configured as separate rooms, the air cleaner 22 can further draw in cooler air.

[0040] Furthermore, if a rubber cover is provided on the shroud inside the radiator 21 so as to cover the outer periphery of the radiator 21, the suction airflow of the radiator fan will be stabilized and hot air flowing toward the operator will be suppressed.

[0041] In addition, a hot air discharge duct that opens upward and efficiently exhausts the hot air from the engine 12 is provided on the upper surface of the front cover 15b at the front end of the front cover 15, thereby suppressing an increase in oil temperature in the engine 12.

[0042] In addition, a cover with an opening facing the opposite direction of travel is provided on the duct to prevent water from entering.

[0043] In addition, above the engine 12 inside the front cover 15, an air guide plate is provided to guide air from the right side (radiator 21 side) to the left side, and the hot air that accumulates above the engine 12 is diverted by the airflow of the radiator fan toward a wire mesh stretched on the left side cover that constitutes the front cover 15 and discharged to the left outside of the aircraft, suppressing an increase in oil temperature in the engine 12 and preventing water from directly splashing on the engine 12 even if it gets into the front cover 15 due to car washing or rain.

[0044] <Seedling planting section 4> The seedling planting section 4 has an eight-row planting configuration and is equipped with a transmission case 30 that also serves as a frame, a seedling carrier 31 that carries mat seedlings and moves back and forth from side to side, supplying seedlings one by one to the seedling outlet 31a of each row, and transporting the seedlings downward by a seedling feed belt that supplies all of the seedlings in a horizontal row to the seedling outlet 31a, and a seedling planting device 32 that plants the seedlings supplied to the seedling outlet 31a in the field.

[0045] A center float 33 is provided in the center of the lower part of the seedling planting section 4, with inner side floats 34a on either side of the center float 33 and outer side floats 34b on the outside of the center float 33. When the machine is advanced with these floats 33, 34a, 34b in contact with the muddy surface of the field, the floats 33, 34a, 34b glide across the muddy surface while leveling it, and seedlings are planted in the leveled area by the seedling planting device 32.

[0046] Each float 33, 34a, 34b is attached so that it can rotate freely, allowing its front end to move up and down in response to the unevenness of the topsoil surface of the field. During planting work, the up and down movement of the front of the center float 33 is detected by an angle-of-attack control sensor, and the hydraulic valve controlling the lifting hydraulic cylinder 3a is switched in response to the detection result to raise and lower the seedling planting section 4, thereby maintaining a constant planting depth for the seedlings.

[0047] <Fertilizer 5> The fertilizer application device 5 uses a delivery section 41 to deliver a fixed amount of granular fertilizer stored in a fertilizer hopper 40, and guides the fertilizer by a fertilizer application hose 42 to fertilizer application guides 43 attached to the left and right sides of the floats 33, 34a, and 34b, and then drops the fertilizer into a fertilizer application area formed near the side of the seedling planting row by a furrow forming body 44 provided in front of the fertilizer application guide 43.

[0048] Air generated by a blower driven by an electric blower motor is blown into the fertilizer application hose 42 via an air chamber 46 that is long in the left-right direction, and the fertilizer in the fertilizer application hose 42 is forcibly transported by wind pressure.

[0049] <Another embodiment>

[0050] (1) A configuration will be described in which the air cleaner 22 is provided on the upper outer side of the front cover 15, the intake pipe 22a extends to the bottom front end of the vehicle body, and the opening 22b at the tip of the intake pipe 22a faces downward.

[0051] As shown in FIG. 4, an opening 22b at the tip of the intake pipe 22a faces downward, and a gap 22c is formed in the middle of the intake pipe 22a.

[0052] Water sucked from an opening 22b at the tip of the intake pipe 22a is sucked up along the inner wall of the pipe, but by forming a gap 22c separated in the middle, the water falls through the gap 22c and can be prevented from reaching the air cleaner 22.

[0053] Furthermore, if a tarpaulin is provided as a shielding plate around the left and right sides of the gap 22c and the bottom side, water resistance can be further improved. Note that drainage holes should be provided in the tarpaulin to prevent water from pooling inside the shielding plate.

[0054] It is even more preferable to provide a barb 22d on the inner wall of the end of the intake pipe 22a on the tip side of the gap 22c to prevent water from being sucked up along the inner wall of the pipe.

[0055] (2) As shown in Figure 5, in an air-cooled engine, an exhaust pipe cover 27 is provided so that the air from the engine cooling fan passes through the cylinder baffle 12a, then passes around the outer periphery of the exhaust pipe and is guided into the muffler cover 28a of the muffler 28, thereby cooling the exhaust pipe and the muffler body and reducing the occurrence of afterburn.

[0056] As shown in Figure 6, muffler cover 28a covers the outer periphery of the muffler body with a gap of about 5 mm between it and the body, and exhaust duct 28b is provided on the opposite side of the part where it connects to exhaust pipe cover 27, so that the air that has passed through exhaust pipe cover 27 goes around the outer periphery of the muffler body and is discharged on the opposite side, efficiently cooling and discharging the air.

[0057] Furthermore, a fin is provided on the rear wheel drive shaft on the side (for example, the left side) where the muffler 28 of the engine 12 is provided, and the air is diffused to the muffler 28, improving the cooling effect.

[0058] A sirocco fan may be used instead of the fins. In that case, it is recommended to provide a dust cover on the sirocco fan's intake port to improve safety. [Explanation of symbols]

[0059] 2 Running vehicle 12 Engine 15 Cover (front cover) 21 Radiator 22 Air cleaner 22a Intake pipe 23a Reinforcement 24 Shielding material (insulator)

Claims

1. This work vehicle has a radiator (21), an air cleaner (22), and an engine (12) installed inside a cover (15) of a traveling body (2), and is characterized in that the tip of the intake pipe (22a) of the air cleaner (22) is arranged on the intake side of the radiator (21) on the outer side of the vehicle body.

2. 2. The work vehicle according to claim 1, wherein a shielding member (24) having an open bottom is provided in the gap between the cover (15) and the radiator (21), and the tip of the intake pipe (22a) is disposed within the shielding member (24).

3. 3. The work vehicle according to claim 1, wherein the tip of the intake pipe (22a) is provided so as to cover the reinforcing portion (23a) of the cover (15) when viewed from the outside, and the tip of the intake pipe (22a) is cut obliquely to make the outer side longer and open.

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