JP4119653B2 - Mobile farm machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mobile agricultural machine, and particularly relates to the arrangement of a power mechanism in a rice transplanter.
[0002]
[Prior art]
Conventionally, a riding rice transplanter, which is one of mobile agricultural machines, has been provided with a hydraulic continuously variable transmission (hereinafter referred to as HST), a mission case, and the like in order to transmit power from the engine to the front and rear wheels and the planting part. In particular, HST has a cooling fan for cooling because it generates a large amount of heat.
For example, as a rice transplanter adopting HST, Japanese Patent Application Laid-Open No. 11-59210 discloses a configuration in which an engine is disposed at the front of the vehicle body, a mission is disposed at the rear, and the HST is mounted at the input of the mission. There is something. However, a relatively small rice transplanter does not have enough space between the engine and the mission case, and the location where the HST is located is also close to the engine.
[0003]
As such a configuration, a rice transplanter disclosed in Japanese Patent Application Laid-Open No. 2001-10359 is disclosed, and an HST cooling fan, an HST, and a transmission case front part are arranged in order from the left side of the body adjacent to the rear of the engine. The exhaust part (exhaust manifold / exhaust pipe) of the engine is arranged on the left part of the engine, while the intake part (radiator / cooling fan) is arranged on the right side of the engine.
However, in this configuration, the exhaust part, which is a particularly high temperature part in the engine, is located in the vicinity of the cooling fan that cools the HST, and the cooling efficiency of the cooling fan is poor, and the HST output may fluctuate. .
[0004]
In the above configuration, the output shaft of the engine is provided in the left-right direction, the pulley attached to the left end of the output shaft and the driven pulley on the input shaft of the HST are wound by a belt, and the transmission to the HST and the cooling fan by the belt interlocking mechanism It is responsible for the rotation drive.
However, the configuration using the belt interlocking mechanism is not necessarily an optimal configuration in terms of transmission efficiency and maintainability.
[0005]
[Problems to be solved by the invention]
Planting the present invention has been created in view of the problems with the aforementioned prior art, for that purpose is a simple structure, it is possible to realize the cooling effect of a suitable hydraulic continuously variable transmission, which is excellent in maintainability an object of the present invention is to provide a machine.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides the following mobile agricultural machines, particularly rice transplanters. That is, a rice transplanter that transmits power from an engine to a transmission case via a hydraulic continuously variable transmission, and a cooling fan that cools at least the hydraulic continuously variable transmission together with the hydraulic continuously variable transmission. The engine exhaust portion is disposed on the left and right sides with at least a part of the engine body interposed therebetween, and the cooling fan is disposed in front of the hydraulic continuously variable transmission and the intake portion for the engine cooling air. It arrange | positions in the back of this, and arrange | positions on the right- and- left other side on both sides of at least one part of an engine body . This makes it possible to place the hydraulic continuously variable transmission and its cooling fan far away from the exhaust part, which is likely to become hot even in the engine, and to place it in the vicinity of the cooling intake part to which cold air from the outside is supplied Cooling effect can be realized.
[0007]
In addition, a spline portion is provided on the input shaft of the hydraulic continuously variable transmission, a cooling fan is attached to the spline portion of the input shaft, and a universal joint that links the input shaft and the output shaft of the engine is slid. Connect freely. According to this configuration, it is possible to easily maintain the cooling fan and hydraulic continuously variable transmission by releasing the connection of the universal joint, and to construct a transmission mechanism that is superior in durability and transmission performance than the belt interlocking mechanism. Can do.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below in detail with reference to the drawings. In the present embodiment, a riding rice transplanter is shown in which a planting section having a seedling platform and planting claws is installed in a traveling vehicle and continuously transplants rice, but it is applied to various mobile farm machines such as tractors and combines. Of course, you may.
[0010]
1 is a side view of the whole, and FIG. 2 is a plan view of the same.
The planting part 3 is installed on the rear side of the traveling vehicle 1 via the link mechanism 2 so as to be movable up and down. The planting part 3 is for mounting a side fertilizer machine 4 for embedding fertilizer on the side of the seedling to be planted on the rear upper surface of the traveling vehicle 1, front and rear wheels 5, 6, driver seat 7, steering handle. 8 is provided in the traveling vehicle 1. The front and rear wheels 5 and 6 are disposed below the step 9 that forms the vehicle body cover, and the steering handle 8 is disposed on the rear side of the bonnet 10 on the front side of the step 9. A driver's seat 7 is disposed on the rear upper surface of step 9.
[0011]
The rice planting work is carried out by providing a seedling stage 11 and a planting claw 12 for planting 5 in the planting part 3 and continuously performing seedlings for 5 strips, and in the soil beside the seedlings for 5 strips. Moreover, the fertilizer application | work which sends out and fertilizes fertilizer from the fertilizer applicator 4 through the conveyance hose 14 for 5 strips by the ventilation conveyance of the air blower 13 is performed. In addition, the spare seedling stand 15 on the side of the bonnet 10 is replenished to the seedling placing stand 11, and the rice transplanting operation is continued.
[0012]
3 is a perspective explanatory view showing the frame structure of the traveling vehicle 1, and FIG. 4 is a plan view thereof.
The traveling vehicle 1 includes a pair of left and right main frames 16, and the front frame 17, the middle frame 18, and the rear frame 19 are connected in a substantially straight line shape in plan view to form the main frame 16.
In addition, the left and right rear frames 19 are fixed to a portal frame 20 on the rear side, and the left and right front frames 17 are fixed to a front bumper 22 and a pulling hook 23 to which a center marker 21 is attached on the front side.
[0013]
Further, a pair of left and right step bases 24, 25, and 26 are fixed to the outer side of the front and rear portions of the front frame 17 and the outer side of the front portion of the rear frame 19, and the full width in the left and right direction above the middle portion of the rear frame 19 is The long step base 27 is fixed.
The upper side of the portal frame 20 includes a horizontal frame 30 having a pair of left and right step bases 29 and a left and right step bases 29 fixed thereto.
[0014]
The outside of each of the step bases 24 to 26 is connected by a front side frame 31, and in particular, the outside of each of the step bases 26, 27 and the horizontal frame 30 is connected by a rear side frame 32. Step 9 is placed on the upper surface of each of the step bases 24 to 29 and fixed, and the step 33 for getting on and off is detachably bolted to the outside of the rear side frame 32.
[0015]
Next, the power transmission mechanism in the traveling vehicle 1 will be described. FIG. 5 is an explanatory plan view thereof.
As shown in FIG. 4, a pair of left and right receiving bases 34 and a frame member 35 are fixed to the left and right front frames 17 to mount the engine 36, and left and right front axle cases 38 are fixed to both sides of the mission case 37. In each case 38, the front wheel 5 is installed, and the middle frame 18 for connecting the front and rear frames 17 and 19 is fixed to the upper side of the case 38.
[0016]
Further, on the front side of the transmission case 37, a hydraulic continuously variable transmission (hereinafter referred to as HST) 39 that transmits the output of the engine 36 to the transmission case 37, a torque generator that amplifies the steering force of the front wheels 5 of the steering handle 8, and A steering case 40 composed of a gear mechanism is fixed. On the other hand, on the rear side of the mission case 37. The rear axle case 42 is fixed via the body case 41 and both sides of the portal frame 20 are fixed to the case 42. Further, the rear wheel 6 is mounted on the case 42.
[0017]
A hydraulic elevating cylinder 43 is attached to the upper side of the machine body case 41, and the piston of the cylinder 43 is connected to the link mechanism 2 that supports the planting part 3 so as to be able to elevate.
[0018]
Further, as shown in FIGS. 3 and 4, both ends of the tank base frame 44 are fixed to the front sides of the left and right rear frames 19, and the front portion of the fuel tank 45 that supplies fuel to the engine 36 is fixed to the base frame 44. Further, a tank 45 is installed between the left and right rear frames 19, and a seat frame 46 is erected on the rear frame 19 as shown in FIG.
[0019]
A driver's seat 7 is attached to the upper side of the seat frame 46 via a seat base 47, and the driver's seat 7 is disposed above the front portion of the tank 45. Further, a muffler 49 of the engine 36 is attached via a stay 48 to the lower surface side of the left front side frame 31 supported by the left step bases 24 and 25. On the other hand, the battery base 50 is fixed to the right front side frame 31 supported by the right step bases 24 and 25.
[0020]
6 is a perspective view of the vicinity of the engine 36, FIG. 7 is a bottom perspective view of a bottom plate 51 and an HST 39 provided on the bottom of the engine for mounting the engine 36 on the cradle 34 and the frame member 35, and FIG. It is a perspective view when it sees from back.
The engine 36 has the following mechanism for supplying and discharging air during combustion. Air is supplied from the intake port 70 to the engine via an air pipe 71, an air cleaner 72, and a carburetor (not shown).
Then, the high-temperature air that is burned and discharged by the engine 36 is discharged from the discharge portion 36 b and is discharged to the outside through the duct 74 and the muffler 49 from the exhaust port 75.
The engine cooling air is taken in from the cooling air intake section 76 of the engine 36.
[0021]
A bearing cylinder 52 is detachably bolted to the right side of the bottom surface of the bottom plate 51 at the bottom of the engine 36, and a transmission shaft 57 is rotatably supported on the bearing cylinder 52, and the front side of the engine 36 is connected via pulleys 53 and 54 and a belt 55. The front end portion of the transmission shaft 57 is connected to the output shaft 56.
[0022]
Conventionally, the bearing cylinder that supports the transmission shaft is welded and fixed to the bottom plate or the like, and there is a problem that the maintainability is poor when the bearing is replaced or lubricated.
However, according to this configuration, since the bearing cylinder 52 is fixed to the bottom plate 51 with bolts, the bearing can be removed and the bearing can be replaced or lubricated, so that the maintainability is improved.
Further, the bearing cylinder 52 is provided with an oil inlet 64 so that oil can be directly injected from the bottom surface side, thereby further improving the maintainability.
[0023]
The rear end portion of the transmission shaft 57 and the HST input shaft 62 protruding from the front end of the HST 39 are detachably connected via a universal joint 60.
Further, a cooling fan 63 for cooling the HST 39 by air cooling is fixed immediately after the universal joint 60 on the HST input shaft 62, and the HST input shaft 62 is blown toward the rear HST 39 as the HST input shaft 62 rotates. It is like that.
[0024]
The HST input shaft 62 is splined so that the cooling fan 63 and the universal joint can slide.
Further, since the cooling fan 63 and the universal joint 60 are slidable on the HST input shaft as described above, the cooling fan 63 and the universal joint 60 are slid and removed from the HST input shaft 62. Maintenance of the cooling fan 63 and the HST 39 can be easily performed.
[0025]
The power of the engine 36 is transmitted to the HST 39 via the transmission shaft 57, and the PTO shaft 65 is extended rearward from the rear side of the transmission case 37 to transmit the power to the planting part 3, and from the transmission case 37 to the rear drive shaft. 66 is extended rearward and input to the rear axle case 42, and power is transmitted from the mission case 37 to the rear wheel 6 via the rear axle case 42. Further, power is transmitted from the mission case 37 to the front wheel 5 through the front axle case 38. The power transmission mechanism of the present embodiment is as described above.
[0026]
As is apparent from FIG. 8, the HST 39 and the cooling fan 63 are located at the lower rear portion of the cooling air intake portion 76 of the engine 36, and both are located in the vicinity. As described above, the cooling air intake section 76 is sucked in the cold air from the outside, and corresponds to a portion having a relatively low temperature around the engine 36 that tends to become high temperature.
[0027]
Therefore, by arranging the cooling air intake section 76 and the HST 39 / cooling fan 63 in the vicinity as in the present configuration and arranging the cooling fan 63 on the windward side of the airflow, the external cold air is cooled by the cooling fan. As a result, the cooling efficiency of the HST 39 is remarkably improved.
In this configuration, the HST 39 body is cooled not only by the cooling fan 63 but also by the airflow generated by the cooling air intake section 76. Furthermore, since cooling fan 63, HST 39, and part of mission case 37 are located on substantially the same line, the cool air blown by cooling fan 63 is effective not only for cooling HST 39 but also for cooling mission case 37.
[0028]
The above configuration also contributes to an improvement in the heat balance of the engine 36. That is, in the vicinity of the engine 36, the exhaust port 75 through which high-temperature air is exhausted is located on the left side of the engine 36 as shown in FIG. 8, while the cooling air intake section 76 and the cooling fan 63 into which external cold air is sucked are It is located on the right side opposite to the engine 36.
The muffler 49 that is particularly hot is disposed in the vicinity of the left end portion of the front frame 17 so that an operator of the driver's seat 7 sucks exhaust air and prevents the work environment from deteriorating due to heat, and is effective due to external cold air. Heat dissipation is achieved.
On the low temperature side, cool air is sucked in by the cooling air intake section 76 to secure an air flow path from the low temperature side to the high temperature side around the engine 36. The worker can work on the safe and comfortable low temperature side.
[0029]
In order to improve the maintainability of the engine 36 and the like, the traveling vehicle 1 in this embodiment is configured so that the bonnet 10 can be easily removed.
FIG. 9 is a perspective explanatory view on the frame side of the structure and attachment / detachment mechanism of the bonnet 10, and FIG. 10 is a perspective explanatory view on the bonnet side.
In FIG. 9, a pair of left and right bonnet support frames 80 are erected upward from the front bumper 22, bent toward the rear from the midway position, and further erected horizontally rearward at the upper end portion. The bonnet 10 is configured to cover the bonnet support frame 80, and the hook 81 at the front lower end facing the front of the traveling vehicle 1 is engaged with the engaging portion 22 a of the front bumper 22, while the back surface of the bonnet 10 is The engaging member 82 disposed on the left hood is locked and fixed by a release lever 83 attached to a horizontal portion of the left bonnet support frame 80.
[0030]
The release lever 83 is operated by opening the lid 84 mounted above the bonnet 10 and pulling the handle portion 83a of the release lever 83 from the front toward the front of the traveling vehicle 1 to lock the release lever 83. The part 83b falls backward, and the engagement member 82 of the bonnet is released.
The operator can easily remove the bonnet by pulling the bonnet 10 forward.
[0031]
On the contrary, when the bonnet 10 is mounted, the release lever 83 is biased by the spring 83c by pushing the upper part of the bonnet 10 after the hook 81 is hooked, so that the engaging member 82 is engaged with the locking portion 83b. Lock to.
As described above, since the release lever 83 is disposed at a position where the operation can be immediately performed when the lid 84 is opened at the upper end position of the bonnet 10, the operability is good and the design is not deteriorated. It is possible to realize a highly safe configuration that prevents the bonnet from being unexpectedly opened due to interference from the outside.
[0032]
【The invention's effect】
The present invention has the following effects.
In other words, by disposing an intake portion for cooling air of the engine that easily sucks external cold air in the vicinity of the cooling fan of the hydraulic continuously variable transmission, the cooling fan cools members such as the hydraulic continuously variable transmission. The effect is enhanced and the output of the hydraulic continuously variable transmission can be stabilized.
In addition, a cooling fan for a hydraulic continuously variable transmission is provided on the intake side of the low-temperature cooling air in the engine, and the high-temperature side and the low-temperature side are located on opposite sides of the engine from the hot exhaust side. Can be divided to improve the heat balance and thus the output.
[0033]
The cooling fan of the hydraulic continuously variable transmission is installed on the spline part of the input shaft of the hydraulic continuously variable transmission and interlocked with the spline-fitted universal joint, so the universal joint can be easily removed. This contributes to improving the maintainability of the cooling fan and HST.
[Brief description of the drawings]
FIG. 1 is an overall side view.
FIG. 2 is a plan view of the same.
FIG. 3 is a perspective view showing a frame structure of a traveling vehicle.
FIG. 4 is a plan view of the same.
FIG. 5 is a plan view of a power transmission mechanism.
FIG. 6 is a perspective view showing a structure around an engine.
FIG. 7 is a lower perspective view of the same.
FIG. 8 is a left perspective view of the same.
FIG. 9 is a perspective view of a bonnet portion.
FIG. 10 is a rear view of the bonnet.
[Explanation of symbols]
36 Engine 36b Exhaust part 49 Muffler 51 Bottom plate 60 Universal joint 63 Cooling fan 70 Intake port 71 Air pipe 72 Air cleaner 73 Pipe line 74 Pipe line 75 Exhaust port 76 Air intake part for engine cooling

Claims (2)

A rice transplanter that transmits power from an engine to a transmission case via a hydraulic continuously variable transmission, and includes a cooling fan that cools at least the hydraulic continuously variable transmission together with the hydraulic continuously variable transmission The engine exhaust is disposed on the left and right sides with at least a part of the engine body interposed therebetween, and the cooling fan is disposed in front of the hydraulic continuously variable transmission and behind the engine cooling air intake. placed, rice transplanters, characterized in that to arrange the left and right the other side across at least a portion of the engine body. A spline portion is provided on the input shaft of the hydraulic continuously variable transmission, a cooling fan is attached to the spline portion of the input shaft, and a universal joint that interlocks and connects the input shaft and the output shaft of the engine is slidable. connected to, characterized in Rukoto, rice transplanter according to claim 1.

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