Farmland operation machine

Abstract

A farmland work machine is provided with: an air-cooled engine unit that has an air-cooled engine and a cooling fan that is positioned further outward than the air-cooled engine in the lateral direction of a vehicle body and that supplies cooling air to the air-cooled engine; and an engine cover which covers the air-cooled engine unit, and the farmland operation machine is not easy to cause adverse effects of hot air generated by engine cooling and the like on engine cooling. The air-cooled engine unit (4) is provided with an air guide member (40) extending in the vehicle body lateral width direction. The air guide member (40) guides the flow of cooling air supplied from the cooling fan (35) to the air-cooled engine (24) to the side opposite to the side where the cooling fan (35) is located.

Description

Technical Field

[0001] This invention relates to agricultural machinery. Background Technology

[0002] As shown in Patent Document 1, there is a type of farmland operation machine (rice transplanter) which includes: an air-cooled engine unit having an air-cooled engine and a cooling fan, the cooling fan being located laterally outside the vehicle body than the air-cooled engine and supplying cooling air to the air-cooled engine; and an engine cover (cover) covering the air-cooled engine unit.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2001-10359 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] Engines are cooled by cooling air from a cooling fan, but if hot air generated by the engine stagnates or recirculates around the engine, the engine cannot be cooled efficiently due to the hot air, requiring a high-performance and expensive oil cooler. Furthermore, in agricultural machinery, a power transmission device that transmits power to the drive unit is located near the engine; this same issue arises when the power transmission device's temperature rises due to hot air.

[0008] This invention provides an agricultural work machine that can cool the engine while minimizing the adverse effects of heat from the surrounding air.

[0009] Solution for solving the problem

[0010] The farmland operation machine of the present invention includes:

[0011] An air-cooled engine unit includes an air-cooled engine and a cooling fan, the cooling fan being located laterally outside the vehicle body than the air-cooled engine and supplying cooling air to the air-cooled engine; an engine hood covering the air-cooled engine unit; and an air guide member arranged to extend along the air-cooled engine unit in the lateral width direction of the vehicle body, guiding the cooling air supplied from the cooling fan to the air-cooled engine to the opposite side of the side where the cooling fan is located.

[0012] According to this structure, hot air generated by engine cooling is guided by the air guide component to flow to the side opposite to where the cooling fan is located, thus allowing the hot air to easily escape from the periphery of the engine. This easy escape of hot air from the periphery of the engine prevents stagnation or backflow of hot air, and cools the engine while minimizing the adverse effects of hot air.

[0013] In this invention, preferably,

[0014] The air guide component is located on the rear side of the vehicle body, which is closer to the air-cooled engine unit.

[0015] The hot air flowing towards the rear of the air-cooled engine unit is guided by air guide components to the opposite side from where the cooling fan is located, thus allowing the hot air to easily escape from around the engine. This facilitates engine cooling while minimizing the adverse effects of hot air.

[0016] In this invention, preferably,

[0017] The end of the air guide component on the opposite side to the side where the cooling fan is located protrudes laterally outward from the vehicle body than the air-cooled engine unit.

[0018] The end of the air guide component, opposite to the side where the cooling fan is located, protrudes laterally outward from the vehicle body compared to the air-cooled engine unit. Therefore, compared to a non-protruding case, the end of the air guide component is closer to the engine hood, allowing the hot air guided by the air guide component to easily flow out of the engine hood's exhaust port. This easy escape of hot air from the engine hood effectively cools the engine while minimizing the adverse effects of hot air.

[0019] In this invention, preferably,

[0020] An inclined guide is provided at the end of the air guide member opposite to the side where the cooling fan is located. When viewed from above, the inclined guide is tilted so that it is located further outward and in front of the vehicle body, guiding the cooling airflow that collides with it toward the exhaust port of the engine hood.

[0021] According to this structure, when hot air guided by the air guide component flows to the side opposite to the side where the cooling fan is located and collides with the inclined guide part, it will be guided by the inclined guide part and easily flow to the exhaust port of the engine hood. Therefore, the hot air can easily flow out of the engine hood and cool the engine while not being adversely affected by the hot air.

[0022] In this invention, preferably,

[0023] A hydrostatic continuously variable transmission is provided at a position on the rear side of the vehicle body, relative to the air guide component.

[0024] Heat transfer from the engine to the continuously variable transmission (CVT) is suppressed by the air guide component. Therefore, the air guide component can be effectively used as a heat insulation component to inexpensively suppress the temperature rise of the CVT caused by engine heat dissipation.

[0025] In this invention, preferably,

[0026] The system includes a cooling fan for the transmission mechanism, which is located on the opposite side of the continuously variable transmission (CVT) and supplies cooling air to the CVT.

[0027] According to this structure, the warm air supplied to the continuously variable transmission (CVT) by the transmission cooling fan is directed to the opposite side of the transmission cooling fan, but the air guide component inhibits the warm air flow towards the engine. By inhibiting the warm air flow towards the engine, the air guide component can be effectively used as a shielding component, and the engine can be cooled without being adversely affected by the warm air.

[0028] In this invention, preferably,

[0029] The cooling fan is equipped with an air intake suppression component located outside the air intake port of the cooling fan to suppress the cooling fan from drawing air from the outer periphery of the air intake port.

[0030] According to this structure, even if hot air generated by engine cooling flows back around the engine, the intake suppression member prevents this hot air from being drawn into the intake port by the cooling fan, thus suppressing the supply of hot air to the engine. By suppressing the supply of hot air to the engine, the engine can be cooled without being adversely affected by the hot air.

[0031] In this invention, preferably,

[0032] The inhalation suppression member is provided around a portion of the upper side of the rear half of the inhalation port and around a portion of the upper side of the front half of the inhalation port, but is not provided around the portion of the rear half of the inhalation port excluding the portion of the inhalation port and around the portion of the front half of the inhalation port excluding the portion of the inhalation port.

[0033] According to this structure, the intake suppression member is arranged around a portion of the upper side of the rear half of the intake port and around a portion of the upper side of the front half of the intake port. Therefore, even if hot air flows towards the cooling fan side relative to the air guide member on the side opposite to the air-cooled engine unit side, the intake suppression member will prevent the hot air from being drawn into the intake port by the cooling fan, thus suppressing the supply of hot air to the engine. No intake suppression member is provided around the portion of the rear half of the intake port excluding the aforementioned portion and around the portion of the front half of the intake port excluding the aforementioned portion. Therefore, cooling air can be smoothly drawn into the intake port from the portion without the intake suppression member in the outer perimeter of the intake port by the intake fan. Cooling air can be smoothly supplied to the engine, and the engine can be cooled without being adversely affected by hot air.

[0034] Another agricultural work machine of the present invention includes:

[0035] An air-cooled engine unit includes an air-cooled engine and a cooling fan, the cooling fan being located laterally outward of the vehicle body from the air-cooled engine and supplying cooling air to the air-cooled engine; an engine hood covering the air-cooled engine unit; and an intake suppression member disposed outside the air intake of the cooling fan to suppress the cooling fan from drawing air from the outer periphery of the air intake, the intake suppression member being disposed around a portion of the upper side of the rear half of the air intake and around a portion of the upper side of the front half of the air intake, except for the portion around the rear half of the air intake and the portion around the front half of the air intake.

[0036] According to this structure, the intake suppression member is arranged around a portion of the upper side of the rear half of the intake port and around a portion of the upper side of the front half of the intake port. Therefore, even if hot air generated by engine cooling flows back towards the cooling fan at a position further rear of the air-cooled engine unit, the intake suppression member prevents this hot air from being drawn into the engine by the cooling fan, thus preventing hot air from being supplied to the engine again. No intake suppression member is provided around the portion of the rear half of the intake port excluding the aforementioned portion and around the portion of the front half of the intake port excluding the aforementioned portion. Therefore, cooling air can be smoothly drawn into the intake fan from the portion of the outer perimeter of the intake port without the intake suppression member. Cooling air can be smoothly supplied to the engine, and the engine can be cooled without being adversely affected by hot air.

[0037] In this invention, preferably,

[0038] It is equipped with an air guide component, which is located on the rear side of the vehicle body, relative to the air-cooled engine unit, to guide the cooling airflow supplied from the cooling fan to the air-cooled engine to the opposite side of the cooling fan.

[0039] According to this structure,

[0040] The hot air flowing towards the rear of the air-cooled engine unit is guided by air guide components to the opposite side from where the cooling fan is located, thus allowing the hot air to easily escape from around the engine. This facilitates engine cooling while minimizing the adverse effects of hot air.

[0041] In this invention, preferably,

[0042] The end of the air guide component on the side where the air intake is located protrudes laterally outward from the vehicle body compared to the air-cooled engine unit.

[0043] Even if the hot air around the air-cooled engine unit flows towards the intake side relative to the air guide member on the opposite side from the air-cooled engine unit and exits laterally outward from the air guide member, it will still flow out through a portion of the air guide member that protrudes laterally outward from the air-cooled engine unit, thus preventing the hot air from easily reaching the intake. This reduced hot air flow to the intake prevents it from being drawn into the air-cooled engine, thereby cooling the air-cooled engine while minimizing its adverse effects.

[0044] In this invention, preferably,

[0045] The end of the air intake suppression component on the outer side of the vehicle body is located on the outer side of the vehicle body, which is closer to the outer side of the vehicle body than the air guide component.

[0046] Even if the hot air surrounding the air-cooled engine unit flows towards the intake side relative to the air guide member on the opposite side from the air-cooled engine unit side and exits laterally outward from the air guide member, the hot air exiting from the air guide member will still collide with the intake suppression member. The hot air collides with the intake suppression member, thereby suppressing the air-cooled engine's attraction of hot air. Furthermore, the hot air flows laterally outward from the intake suppression member and exits outside the vehicle, thus cooling the air-cooled engine while minimizing the adverse effects of the hot air.

[0047] In this invention, preferably,

[0048] A fuel filter for the air-cooled engine is provided at a position relative to the rear of the vehicle body, where the upper part of the air-cooled engine unit is lower than the upper end of the air-cooled engine unit but higher than the upper end of the fuel filter.

[0049] According to this structure, the piping that connects the fuel filter to the air-cooled engine can be connected to the air-cooled engine through the top of the air guide component, making it easy to connect the fuel filter to the air-cooled engine.

[0050] Heat is prevented by using air-guiding components to minimize heat transfer from the air-cooled engine to the fuel filter. This allows for easy connection of the fuel filter to the air-cooled engine while simultaneously preventing the fuel filter from overheating due to the air-cooled engine.

[0051] In this invention, preferably,

[0052] The transverse hoods on the left and right sides of the engine hood, specifically the side where the air intake is located, have ventilation openings.

[0053] The length of the vent in the front-rear direction of the vehicle body is set to be longer than the length of the air intake in the front-rear direction of the vehicle body.

[0054] According to this structure, even if the vertical length of the air intake cannot be too long due to factors such as the vertical length of the transverse cover, the length of the air vent in the front-rear direction of the vehicle body can ensure a large air vent that takes into account the intake of the air-cooled engine unit and the exhaust of hot air. Attached Figure Description

[0055] Figure 1 This is a side view of the ride-on rice transplanter from the right side.

[0056] Figure 2 This is a side view of the power unit viewed from the right side.

[0057] Figure 3 This is a top view of the power unit.

[0058] Figure 4 This is an explanatory diagram of the inhalation suppression component.

[0059] Figure 5 This is a front view of the intake suppression component and the guide plate. Detailed Implementation

[0060] Hereinafter, an embodiment of the present invention will be described based on the accompanying drawings.

[0061] It should be noted that in the following description, the vehicle body of a ride-on rice transplanter (an example of a "field work machine") will be... Figure 1 , Figure 2 As shown, arrow F is positioned towards the "front of the vehicle," arrow B towards the "rear of the vehicle," arrow U towards the "upper part of the vehicle," and arrow D towards the "lower part of the vehicle." Figure 1 The orientation of the front side of the paper is designated as "right side of the vehicle body," and the orientation of the back side of the paper is designated as "left side of the vehicle body." Figure 5 The direction of arrow L is set to "left side of the vehicle body", and the direction of arrow R is set to "right side of the vehicle body". The left and right directions of the vehicle body correspond to the lateral width direction of the vehicle body.

[0062] [The complete ride-on rice transplanter]

[0063] Figure 1 This is a side view of the ride-on rice transplanter from the right side of the vehicle. The ride-on rice transplanter has a traveling body 3, which is supported by a pair of steerable and driveable front wheels 1 and a pair of driveable rear wheels 2. An air-cooled engine unit 4 (see reference) is located at the front of the traveling body 3. Figure 2 , Figure 3The power unit 5 is located at the rear of the vehicle body 3. A driver's unit 6 is located at the rear of the vehicle body 3, where the driver sits and operates the vehicle. The driver's unit 6 is equipped with a driver's seat 7 and a steering wheel 8 for steering the front wheels 1. A seedling planting device 10 is connected to the rear of the vehicle body frame 9 of the vehicle body 3. The seedling planting device 10 is connected to the vehicle body frame 9 via a linkage mechanism 11, which extends vertically from the rear of the vehicle body frame 9 toward the rear of the vehicle body. The linkage mechanism 11 is operated vertically by the extension and retraction of the lifting cylinder 12, thereby raising and lowering the seedling planting device 10 relative to the vehicle body 3. The vehicle body frame 9 consists of a gearbox 13, a rear frame 14, and a front frame 15. The rear frame 14 extends from the rear of the gearbox 13 toward the rear of the vehicle body for mounting the driver's seat 7, etc., and the front frame 15 extends from the front of the gearbox 13 toward the front of the vehicle body for mounting the air-cooled engine unit 4, etc.

[0064] [Power Department]

[0065] like Figure 1 , Figure 2 , Figure 3 As shown, the power unit 5 is equipped with an air-cooled engine unit 4 and an engine cover 16 covering the air-cooled engine unit 4. A base portion 17 for an instrument panel (not shown) is connected to the upper rear part of the engine cover 16. The engine cover 16 includes: a lower cover portion 19; an upper cover portion 20 located above the lower cover portion 19 and covering the air-cooled engine unit 4 from above; and a rear cover portion 21 located behind the lower cover portion 19 and covering the upper part of the air-cooled engine unit 4 from the rear.

[0066] like Figure 3 As shown, the lower cover 19 includes: left and right lateral cover portions 19a that cover the upper part of the air-cooled engine unit 4 from the lateral sides; and a front cover portion 19b that connects to the front of the left and right lateral cover portions 19a and covers the upper part of the air-cooled engine unit 4 from the front.

[0067] like Figure 1 As shown, a pivot support axis P is provided at the rear of the upper cover 20, which pivotally supports the upper cover 20 in the vehicle frame 9. The upper cover 20 is held in the vehicle frame 9 in a state where it can swing up and down to open and close with the pivot support axis P as the pivot fulcrum. The engine hood 16 is made of resin.

[0068] like Figure 2 , Figure 3 As shown, the air-cooled engine unit 4 includes: an air-cooled engine 24, a cooling air supply unit 26 located on the right side of the vehicle body of the air-cooled engine 24, a starter motor 27 mounted on the front of the air-cooled engine 24, and a fuel filter 25 connected to the upper rear of the air-cooled engine 24.

[0069] The air-cooled engine unit 4 is mounted to the front frame 15 with the crankshaft (not shown) of the air-cooled engine 24 extending in the direction along the width of the vehicle body. For example... Figure 2 As shown, the air-cooled engine unit 4 is assembled to the front frame 15 in the following manner: connecting parts 28 are provided at the lower front and lower rear of the air-cooled engine 24, the connecting parts 28 at the lower front are connected to the front engine support 29a provided at the front of the front frame 15 via a buffer 30, and the connecting parts 28 at the lower rear are connected to the rear engine support 29b provided at the rear of the front frame 15 via a buffer 30.

[0070] The air-cooled engine 24 is an air-cooled gasoline engine. The air-cooled engine 24 has cylinder sections 24a located at both the upper front and upper rear portions. The front and rear cylinder sections 24a are arranged in a V-shape when viewed along the width of the vehicle body. An intake section 24b is formed between the front cylinder section 24a and the rear cylinder section 24a. The intake section 24b is connected to the air filter 34 (see reference 34) via an intake pipe 31. Figure 2 In this embodiment, the air-cooled engine 24 is a gasoline engine, but it may also be a diesel engine.

[0071] like Figure 2 , Figure 3 As shown, a gearbox 13 and a hydrostatic continuously variable transmission (CVT) 33 mounted on the left side of the vehicle body are located on the rear side of the air-cooled engine unit 4. The air-cooled engine 24 is equipped with an output shaft 24c that protrudes laterally to the left side of the vehicle body from the lower part of the air-cooled engine 24. The power from the output shaft 24c is configured to be input to the CVT 33 via a belt drive mechanism 32, and the output of the CVT 33 is input to the gearbox 13. The power input to the gearbox 13 is configured to be transmitted to the front wheels 1 and rear wheels 2 via a travel gear transmission mechanism (not shown) housed in the gearbox 13, and the power input to the gearbox 13 is transmitted to the seedling transplanting device 10 via a working gear transmission mechanism (not shown) housed in the gearbox 13. This enables the air-cooled engine 24 to drive the front wheels 1, rear wheels 2, and seedling transplanting device 10.

[0072] like Figure 2 , Figure 3 As shown, the cooling air supply unit 26 includes: a cooling fan 35 located laterally to the right outer side of the vehicle body relative to the air-cooled engine 24; and a fan housing 36 covering the cooling fan 35. The fan housing 36 is attached to the air-cooled engine 24. An air intake 37 for the cooling fan 35 is opened in the fan housing 36 opposite to the cooling fan 35. A dust filter is provided at the air intake 37.

[0073] In the cooling air supply section 26, the cooling fan 35 is driven by the air-cooled engine 24. Through the air delivery action of the cooling fan 35, air is drawn from a position lower than the right-side transverse shroud 19a toward the air intake 37, and then through the air vent 39 (see reference) in the right-side transverse shroud 19a. Figure 1 , Figure 3 Air is drawn in from the outside of the engine hood 16. Air intake from the vent 39 of the transverse hood 19a is guided below the transverse hood 19a by a guide plate 18 located laterally outside the intake vent 37 (see reference). Figure 5 The air intake from the vent 39 and the air intake from a position lower than the transverse shroud 19a are guided towards the intake 37, and are then introduced into the interior of the fan housing 36 through the intake 37 to generate cooling air. The generated cooling air is then drawn from the opening 36a of the fan housing 36 toward the air-cooled engine 24 by the cooling fan 35 (see reference). Figure 3 The cooling air is supplied to the air-cooled engine 24 and flows around the air-cooled engine 24 to the opposite side from where the cooling fan 35 is located, thus cooling the air-cooled engine 24. Figure 5 As shown, the guide plate 18 is mounted to the front frame 15 at an angle with the greater distance between the upper end and the air intake 37. The mounting of the guide plate 18 to the front frame 15 is performed via a connecting member 18a that connects the guide plate 18 and the front frame 15.

[0074] like Figure 1 As shown, the vents 39 of the right-side horizontal cover 19a are located at three points, one above and one below. Figure 1 , Figure 3 As shown, the length L1 of each of the three vents 39 in the longitudinal direction of the vehicle body is set to be longer than the length L2 of the air intake 37 in the longitudinal direction of the vehicle body. In this embodiment, the vents 39 of the right-side transverse cover 19a are provided at three locations, one above the other, but they may also be provided at two or fewer locations or four or more locations. Furthermore, as the vent 39, a single vent with an area equal to the total area of ​​the three vents 39 can be used.

[0075] like Figure 2 , Figure 3As shown, a guide member 40 is provided at a position relative to the rear of the vehicle body, closer to the air-cooled engine unit 4. The guide member 40 is held in the front frame 15 along the air-cooled engine 24, extending in the transverse direction of the vehicle body, and guides the cooling airflow from the cooling fan 35 to the side opposite to the side where the cooling fan 35 is located. The front frame 15 holds the guide member 40 by connecting the lower end of the guide member 40 to the support portion 41 located on the upper part of the rear engine support portion 29b using connecting bolts. The hot air generated by cooling the air-cooled engine 24, etc., is guided by the guide member 40 to flow to the side opposite to the side where the cooling fan 35 is located, allowing the hot air to be discharged from around the air-cooled engine 24 to the outside via a position lower than the left-side transverse shroud 19a. Furthermore, the hot air is allowed to pass through a vent 42 (see reference) opening in the left-side transverse shroud 19a. Figure 3 The exhaust port allows air to flow easily to the outside of the engine hood 16. In this embodiment, the air guide member 40 is made of a metal plate member.

[0076] The vent 42 on the left side of the transverse cover 19a, like the vent 39 on the right side, is located at three points on the upper and lower parts of the transverse cover 19a. The length of each of the three vents 42 in the longitudinal direction of the vehicle body is set to be the same as the length of the right-side vent 39 in the longitudinal direction of the vehicle body. In this embodiment, the vents 42 are located at three points, but they may also be located at two or fewer points or more. Furthermore, the vent 42 may be a single vent with an area equal to the total area of ​​the three vents 42 located on the upper and lower parts.

[0077] The length of the air guide component 40 in the lateral width direction of the vehicle body is set to be longer than the length of the air-cooled engine unit 4 in the lateral width direction of the vehicle body, that is, the length from the right outer end of the fan housing 36 to the left outer end of the air-cooled engine 24. For example... Figure 2 , Figure 3 As shown, the fuel filter 25 for the air-cooled engine 24 is located further rearward than the air guide member 40. The fuel filter 25 is situated within the lateral width of the air guide member 40. Figure 2 , Figure 4As shown, the air guide member 40 is configured such that its upper part 40t is located lower than the upper end 4t of the air-cooled engine unit 4 (in this embodiment, the upper end of the cylinder portion 24a of the air-cooled engine 24) and higher than the upper end 25b of the fuel filter 25. This allows the piping 25a connecting the fuel filter 25 to the air-cooled engine 24 to pass above the air guide member 40 while the air guide member 40 provides heat protection to prevent heat dissipation from the air-cooled engine 24 from being easily transferred to the fuel filter 25. In this embodiment, the upper part 40t of the air guide member 40 is positioned lower than the upper end 4t of the air-cooled engine unit 4, but the upper part 40t of the air guide member 40 could also be positioned higher than the upper end 4t of the air-cooled engine unit 4.

[0078] like Figure 3 As shown, the air guide member 40 is configured such that its end 40a on the opposite side of the cooling fan 35 protrudes laterally outward from the air-cooled engine unit 4.

[0079] Although the end 40a of the air guide member 40 cannot be extended to the drive belt of the belt drive mechanism 32, it can be brought close to the left lateral cover 19a, so that the hot air guided by the air guide member 40 to the side opposite to the side where the cooling fan 35 is located can easily flow out to a position further out than the left lateral cover 19a.

[0080] like Figure 2 , Figure 3 As shown, at the end 40a of the air guide member 40 opposite to the side where the cooling fan 35 is located, a first inclined guide portion 43 is provided, which, when viewed from above, is inclined towards the outermost side of the vehicle body and towards the front of the vehicle body. The hot air guided by the air guide member 40 collides with the first inclined guide portion 43 and is guided by the first inclined guide portion 43 to flow into the vent 42 of the left-side transverse hood portion 19a. This allows the hot air guided by the air guide member 40 to easily flow out to the outside of the engine hood 16.

[0081] In this embodiment, such as Figure 2 As shown, the first tilting guide portion 43 is provided on the upper part of the end 40a of the air guide member 40 on the side opposite to the side where the cooling fan 35 is located (the part of the end 40a located inside the engine hood 16). The first tilting guide portion 43 may also be provided on the entire end 40a from the lower end to the upper end.

[0082] like Figure 2 , Figure 3 , Figure 5 As shown, an intake suppression member 45 is provided on the outside of the intake port 37 of the cooling fan 35 to suppress the cooling fan 35 from drawing air from the outer periphery of the intake port 37.

[0083] like Figure 2 , Figure 4 As shown, the inhalation suppression member 45 is provided around a portion 37R1 on the upper side of the rear half 37R of the inhalation port 37 and around a portion 37F1 on the upper side of the front half 37F of the inhalation port 37. The inhalation suppression member 45 is not provided around any portion of the inhalation port 37 except for the portion 37R1 on the upper side of the rear half 37R of the inhalation port 37 and the portion 37F1 on the upper side of the front half 37F of the inhalation port 37. The inhalation suppression member 45 is held in the front frame 15. Figure 2 As shown, the front frame 15 holds the inhalation suppression member 45 by means of a connecting part 46 provided at the rear end of the inhalation suppression member 45, and the connecting part 46 is connected to the bracket 47 mounted on the front frame 15 by means of connecting bolts.

[0084] Without the intake suppression member 45, the range A in the vertical direction of the vehicle body on the lateral outer side of the intake port 37 (refer to...) Figure 4 The hot air from the rear of the air-cooled engine unit 4, moving towards the front of the vehicle body, flows laterally to the outer side of the intake 37. The rear portion 45r of the intake suppression member 45, located around the upper end of a portion 37R1 of the rear half 37R of the intake 37, inhibits the hot air from the rear of the air-cooled engine unit 4, moving towards the front of the vehicle body, from being drawn into the intake 37. The hot air flowing from the rear of the air-cooled engine unit 4, moving towards the front of the vehicle body and colliding with the rear portion 45r of the intake suppression member 45, is reflected towards a position further forward than the rear portion 45r. The front portion 45f of the intake suppression member 45, located around the upper end of a portion 37F1 of the front half 37F of the intake 37, inhibits the hot air reflected forward from the rear portion 45r from being drawn into the intake 37.

[0085] Even if the hot air generated by the cooling of the air-cooled engine 24 and flowing back around the air-cooled engine unit 4 flows towards the cooling fan 35 on the opposite side (behind the rear of the vehicle body than the air guide member 40) relative to the side where the air-cooled engine unit 4 is located, the intake suppression member 45 prevents this hot air from being drawn into the air intake 37 by the cooling fan 35. The intake suppression member 45 prevents the returning hot air from being supplied to the air-cooled engine 24 again. Cooling air is smoothly drawn to the cooling fan 35 from the parts of the outer periphery of the air intake 37 that do not have the intake suppression member 45. Cooling air is smoothly supplied to the air-cooled engine 24 while the supply of hot air to the air-cooled engine 24 is suppressed.

[0086] like Figure 3As shown, the air guide member 40 is configured such that the end 40c of the air guide member 40 on the side where the air intake 37 is located protrudes laterally outward from the air-cooled engine unit 4 (the end 4a on the air intake side of the air-cooled engine unit 4). Figure 3 As shown, the intake suppression member 45 is configured such that the end 45a of the intake suppression member 45 on the lateral outer side of the vehicle body protrudes laterally outward from the air guide member 40 (the end 40c on the intake side of the air guide member 40). Even if the hot air around the air-cooled engine unit 4 flows towards the intake 37 from the side opposite to the air-cooled engine unit side of the air guide member 40 and flows outward from the lateral outer side of the vehicle body from the air guide member 40, it will be deflected at the part of the air guide member 40 that protrudes laterally outward from the air-cooled engine unit 4, thus making it difficult for the hot air to reach the intake 37. Even if the hot air flowing outward from the air guide member 40 towards the lateral outer side of the vehicle body reaches the intake 37, the hot air will collide with the intake suppression member 45, thereby suppressing the air-cooled engine 24 from attracting the hot air.

[0087] like Figure 2 , Figure 3 , Figure 5 As shown, buffer members 48 are bonded to the outer and inner periphery of the intake suppression member 45. The buffer members 48 prevent resin products of the air-cooled engine unit 4 from contacting the intake suppression member 45.

[0088] In this embodiment, the inhalation suppression member 45 is configured to, along such a path... Figure 2 , Figure 3 The cooling fan 35 shown extends in the direction of the rotation axis X, but the intake suppression member 45 can also be a member configured to have a front end extension state (horn state) that is further away from the intake port 37 laterally from the rotation axis X.

[0089] In this embodiment, the inhalation suppression member 45 is configured to be present in a portion of the area around the inhalation port 37, but not in the remaining portion around the inhalation port 37. However, an inhalation suppression member may be present in a manner that covers the entire circumference of the inhalation port 37.

[0090] like Figure 2 , Figure 3As shown, a gearbox 13 and a hydrostatic continuously variable transmission (CVT) 33 are located on the left side of the vehicle body, near the rear of the air guide member 40. The CVT 33 is configured to continuously variablely transmit the power input to the output shaft 24c of the air-cooled engine 24 via a belt drive mechanism 32, and then input the power to the gearbox 13. The gearbox 13 houses a driving gear transmission mechanism (not shown) that transmits the input power to the front wheels 1 and the rear wheels 2, and a working gear transmission mechanism (not shown) that transmits the input power to the seedling transplanting device 10.

[0091] like Figure 3 As shown, a transmission cooling fan 50 is provided on the side opposite to the continuously variable transmission (CVT) 33, opposite to the side where the cooling fan 35 is located, to supply cooling air to the CVT 33 and the gearbox 13. Specifically, the transmission cooling fan 50 is mounted on the input shaft 33a of the CVT 33 and is driven by the rotation of the input shaft 33a to supply cooling air to the CVT 33 and the gearbox 13. The cooling air cools the working oil of the CVT 33 and the lubricating oil in the gearbox.

[0092] The air guide component 40 is located between the air-cooled engine unit 4 and the continuously variable transmission 33 and between the air-cooled engine unit 4 and the gearbox 13. The heat transfer from the air-cooled engine unit 4 to the continuously variable transmission 33 and the gearbox 13 is suppressed by the air guide component 40.

[0093] Cooling air supplied from the transmission cooling fan 50 to the continuously variable transmission 33 and gearbox 13 is guided by the air guide member 40 in a manner opposite to that of the air-cooled engine unit 4. Warm air generated from cooling the continuously variable transmission 33 and gearbox 13 is also guided by the air guide member 40 in a manner opposite to that of the transmission cooling fan 50, allowing the warm air to be easily discharged from the vent 39 of the right-side transverse shroud 19a to the outside of the engine hood 16. Furthermore, the air guide member 40 prevents warm air from flowing directly towards the air-cooled engine unit 4.

[0094] It can be configured such that a second inclined guide portion is provided at the end of the air guide member 40 opposite to the side where the transmission cooling fan 50 is located, and the cooling air from the transmission cooling fan 50 is guided by the second inclined guide portion to flow into the vent 39 of the right-side horizontal cover portion 19a.

[0095] The warm air generated by cooling the continuously variable transmission 33 and the gearbox 13 and directed by the air guide member 40 to flow laterally outward from the air guide member 40 to the side opposite to where the transmission cooling fan 50 is located is suppressed by the air intake suppression member 45 to prevent it from being drawn into the cooling fan 35 from the air intake 37.

[0096] like Figure 2 , Figure 3 As shown, a raised portion 40b is formed in the middle of the air guide member 40 in the transverse width direction of the vehicle body, facing the front side of the vehicle body. The continuously variable transmission 33 is equipped with a speed limiting mechanism (not shown), which limits the speed at which the transmission operating device can perform gear shifting operations on the continuously variable transmission 33 to a speed lower than the maximum speed of the continuously variable transmission 33. The raised portion 40b has a space within it for the connecting rod member constituting the speed limiting mechanism to enter in a manner that prevents it from colliding with the air guide member 40.

[0097] like Figure 3 As shown, an exhaust muffler 51 is provided on the side opposite to the cooling fan 35, relative to the air-cooled engine 24. The exhaust muffler 51 is connected to one of the two exhaust sections of the air-cooled engine 24 via a first exhaust pipe 52, and to the other of the two exhaust sections of the air-cooled engine 24 via a second exhaust pipe 53. The exhaust muffler 51 is covered by a heat-insulating muffler cover 54. The first exhaust pipe 52 and the second exhaust pipe 53 are covered by a heat-insulating exhaust pipe cover 55. Heat transfer from the exhaust muffler 51, the first exhaust pipe 52, and the second exhaust pipe 53 to the engine hood 16 is suppressed by the muffler cover 54 and the exhaust pipe cover 55.

[0098] [Other Implementation Methods]

[0099] (1) When the steering motor for steering the front wheel 1 is provided and the control device using a microcomputer is used, the temperature rise of the steering motor and the control device can be prevented by the air guide member 40, which is located in the lateral width of the vehicle body, which is located on the side of the air guide member 40 that is closer to the rear of the vehicle body, through the air guide member 40.

[0100] (2) In the above embodiment, an example is shown where the cooling fan 35 is located on the right side of the vehicle body, which is closer to the air-cooled engine 24. However, the cooling fan 35 may also be located on the left side of the vehicle body, which is closer to the air-cooled engine 24.

[0101] (3) In the above embodiment, an example is shown with a guide member 40 and an intake suppression member 45, but it can also be implemented without a guide member 40 but with an intake suppression member 45. The intake suppression member 45 can prevent hot air generated by the cooling of the air-cooled engine 24 and flowing back behind the air-cooled engine unit 4 from being drawn back by the cooling fan 35. The cooling fan 35 can smoothly draw cooling air from the area around the intake port 37 where the intake suppression member 45 is not present.

[0102] (4) In the above embodiment, an example is shown with an air guide member 40 and an air intake suppression member 45, but it is also possible to provide an air guide member 40 without providing an air intake suppression member 45.

[0103] (5) In the above embodiment, an example is shown in which the air guide member 40 is provided only at the rear side of the vehicle body of the air-cooled engine unit 4, but it is not limited thereto. The air guide member 40 may also be provided at at least one of the following locations of the air-cooled engine unit 4: the rear side of the vehicle body, the front side of the vehicle body, the upper side of the vehicle body, and the lower side of the vehicle body.

[0104] (6) In the above embodiment, an example is shown in which the end 40a of the air guide member 40 on the side opposite to the side where the cooling fan 35 is located protrudes laterally outward from the vehicle body than the air-cooled engine unit 4, but it is also possible that the end 40a of the air guide member 40 does not protrude laterally outward from the vehicle body than the air-cooled engine unit 4.

[0105] (7) In the above embodiment, an example is shown in which a first inclined guide portion 43 is provided at the end 40a of the air guide member 40 on the side opposite to the side where the cooling fan 35 is located, but the first inclined guide portion 43 may not be provided.

[0106] (8) In the above embodiment, an example is shown in which the end 40c of the air guide member 40 on the side where the air intake 37 is located protrudes laterally outward from the vehicle body than the air-cooled engine unit 4, but it is also possible that the end 40c of the air guide member 40 does not protrude laterally outward from the vehicle body than the air-cooled engine unit 4.

[0107] (9) In the above embodiment, an example is shown in which the end 45a of the intake suppression member 45 protrudes laterally to the outside of the vehicle body than the air guide member 40. However, it is also possible that the end 45a of the intake suppression member 45 does not protrude laterally to the outside of the vehicle body than the air guide member 40.

[0108] (10) In the above embodiment, an example is shown where the fuel filter 25 is located on the rear side of the vehicle body, which is closer to the air guide member 40. However, the fuel filter 25 may be located at any position, such as on the front side of the vehicle body, which is closer to the air-cooled engine 24.

[0109] (11) In the above embodiment, an example is shown in which the length L1 of the vent 39 is set to be longer than the length L2 of the inlet 37, but the length L1 of the vent 39 may also be the same as or shorter than the length L2 of the inlet 37.

[0110] Industrial availability

[0111] This invention can be applied to agricultural work machines equipped with an air-cooled engine unit and an engine cover that covers the air-cooled engine unit. The air-cooled engine unit has an air-cooled engine and a cooling fan located laterally outside the vehicle body, which supplies cooling air to the air-cooled engine.

[0112] Explanation of reference numerals in the attached figures

[0113] 4: Air-cooled engine unit; 4t: Upper end; 16: Engine hood; 19a: Lateral hood; 24: Air-cooled engine; 25: Fuel filter; 25b: Upper end; 33: Continuously variable transmission (CVT); 35: Cooling fan; 37: Intake port; 37F: Front half; 37F1: Part of the front half; 37R: Rear half; 37R1: Part of the rear half; 40: Air guide member; 40a: End; 40c: End; 42: Vent (exhaust port); 43: First inclined guide (inclined guide); 45: Intake suppression member; 4a: End; 50: Transmission cooling fan; L1: Length; L2: Length.

Claims

1. A farmland operation machine, characterized in that, have: An air-cooled engine unit includes an air-cooled engine and a cooling fan, wherein the cooling fan is located laterally outside the vehicle body than the air-cooled engine and supplies cooling air to the air-cooled engine. An engine hood covers the air-cooled engine unit; as well as The air guide component is arranged to extend along the width of the vehicle body along the air-cooled engine unit, guiding the cooling airflow supplied from the cooling fan to the air-cooled engine to the opposite side of the side where the cooling fan is located.

2. The farmland operation machine according to claim 1, characterized in that, The air guide component is located on the rear side of the vehicle body, which is closer to the air-cooled engine unit.

3. The farmland operation machine according to claim 2, characterized in that, The end of the air guide component on the opposite side to the side where the cooling fan is located protrudes laterally outward from the vehicle body than the air-cooled engine unit.

4. The farmland operation machine according to claim 2 or 3, characterized in that, An inclined guide is provided at the end of the air guide member opposite to the side where the cooling fan is located. When viewed from above, the inclined guide is tilted so that it is located further outward and in front of the vehicle body, guiding the cooling airflow that collides with it toward the exhaust port of the engine hood.

5. The agricultural machinery according to any one of claims 2 to 4, characterized in that, A hydrostatic continuously variable transmission is provided at a position on the rear side of the vehicle body, relative to the air guide component.

6. The farmland operation machine according to claim 5, characterized in that, The system includes a cooling fan for the transmission mechanism, which is located on the opposite side of the continuously variable transmission (CVT) and supplies cooling air to the CVT.

7. The agricultural machinery according to any one of claims 2 to 6, characterized in that, The cooling fan is equipped with an air intake suppression component located outside the air intake port of the cooling fan to suppress the cooling fan from drawing air from the outer periphery of the air intake port.

8. The farmland operation machine according to claim 7, characterized in that, The inhalation suppression member is provided around a portion of the upper side of the rear half of the inhalation port and around a portion of the upper side of the front half of the inhalation port, but is not provided around the portion of the rear half of the inhalation port excluding the portion of the inhalation port and around the portion of the front half of the inhalation port excluding the portion of the inhalation port.

9. A farmland operation machine, characterized in that, have: An air-cooled engine unit includes an air-cooled engine and a cooling fan, wherein the cooling fan is located laterally outside the vehicle body than the air-cooled engine and supplies cooling air to the air-cooled engine. An engine hood, covering the air-cooled engine unit; and An air intake suppression component is disposed outside the air intake of the cooling fan to suppress the cooling fan from drawing air from the outer periphery of the air intake. The inhalation suppression member is provided around a portion of the upper side of the rear half of the inhalation port and around a portion of the upper side of the front half of the inhalation port, but is not provided around the portion of the rear half of the inhalation port excluding the portion of the inhalation port and around the portion of the front half of the inhalation port excluding the portion of the inhalation port.

10. The farmland operation machine according to claim 9, characterized in that, It is equipped with an air guide component, which is located on the rear side of the vehicle body, relative to the air-cooled engine unit, to guide the cooling airflow supplied from the cooling fan to the air-cooled engine to the opposite side of the cooling fan.

11. The farmland operation machine according to claim 10, characterized in that, The end of the air guide component on the side where the air intake is located protrudes laterally outward from the vehicle body compared to the air-cooled engine unit.

12. The farmland operation machine according to claim 10 or 11, characterized in that, The end of the air intake suppression component on the outer side of the vehicle body is located on the outer side of the vehicle body, which is closer to the outer side of the vehicle body than the air guide component.

13. The agricultural machinery according to any one of claims 10 to 12, characterized in that, A fuel filter for the air-cooled engine is located on the rear side of the vehicle body, closer to the air guide component. The upper part of the air guide component is located lower than the upper end of the air-cooled engine unit and higher than the upper end of the fuel filter.

14. The agricultural machinery according to any one of claims 9 to 13, characterized in that, The transverse hoods on the left and right sides of the engine hood, specifically the side where the air intake is located, have ventilation openings. The length of the vent in the front-rear direction of the vehicle body is set to be longer than the length of the air intake in the front-rear direction of the vehicle body.

Images