JP2003237395A - Mobile agricultural machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile agricultural machine that realizes an appreciable cooling effect on a hydraulic continuously variable transmission and excels in maintainability via a simple structure. <P>SOLUTION: A cooling fan 63 for air-cooling the hydraulic continuously variable transmission is arranged near a cooling air intake part 76 of an engine, and positioned opposite an exhaust part 75 of the engine with at least a part of an engine body 36 in between. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a mobile agricultural machine,
Especially, it is related to the arrangement of the power mechanism in the rice transplanter.

[0002]

2. Description of the Related Art Conventionally, a riding rice transplanter, which is one of mobile agricultural machines, is a hydraulic continuously variable transmission (hereinafter referred to as HST) in order to transmit power from an engine to front and rear wheels and a planting portion.
A mission case and the like are provided, and in particular, some HSTs have a cooling fan for cooling because they generate a large amount of heat. For example, as a rice transplanter adopting HST, Japanese Patent Laid-Open No. 11-59210 discloses a configuration in which an engine is arranged in the front part of a vehicle body, a mission is arranged in the rear part, and the HST is mounted in the input part of the mission. There is something. However, in a relatively small rice transplanter, the space between the engine and the mission case is not sufficient, and the location of the HST is near the engine.

An example of such a configuration is Japanese Patent Laid-Open No. 2001-1.
The rice transplanter in Japanese Patent No. 0359 is disclosed, in which a cooling fan of the HST, an HST, and a front part of the mission case are arranged adjacent to the rear of the engine from the left side of the machine. The exhaust portion (exhaust manifold / exhaust pipe) of the engine is arranged on the left side of the engine, while the intake portion (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, so that the cooling efficiency of the cooling fan is poor and the HST output may fluctuate. .

Further, in the above construction, the output shaft of the engine is provided in the left-right direction, and 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 belt interlocking mechanism transmits the power to the HST. It controls the rotation of the cooling fan. However, the configuration using the belt interlocking mechanism has not always been optimal in terms of transmission efficiency and maintainability.

[0005]

SUMMARY OF THE INVENTION The present invention was created in view of the problems of the above-mentioned prior art, and its object is to realize a suitable hydraulic type continuously variable transmission cooling effect with a simple structure. At the same time, it is an object to provide a mobile agricultural machine having excellent maintainability.

[0006]

In order to solve the above problems, the present invention provides the following mobile agricultural machine, especially rice transplanter. That is, in a mobile agricultural machine that transmits power from an engine through a hydraulic continuously variable transmission, the configuration including a hydraulic continuously variable transmission and at least a cooling fan that cools the hydraulic continuously variable transmission. , The cooling fan,
It is arranged in the vicinity of the intake portion of the cooling air of the engine, and at the opposite side to the exhaust portion of the engine with at least a part of the engine body sandwiched. As a result, the hydraulic continuously variable transmission and its cooling fan are arranged at a position far from the exhaust portion that tends to become hot in the engine, and are preferably arranged in the vicinity of the cooling intake portion to which cold air from the outside is supplied. It is possible to realize an excellent cooling effect.

Alternatively, in a structure in which the rice transplanter is provided with a hydraulic continuously variable transmission and at least a cooling fan for cooling the hydraulic continuously variable transmission, the cooling fan is provided in front of the hydraulic continuously variable transmission. Further, the same effect can be obtained by providing the cooling air of the engine at the rear of the intake portion.

Furthermore, a mobile agricultural machine for transmitting power from an engine through a hydraulic continuously variable transmission, and a cooling fan for cooling at least the hydraulic continuously variable transmission together with the hydraulic continuously variable transmission. In the configuration, 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 for connecting the input shaft and the output shaft of the engine is slid. Connect freely. According to this configuration, the cooling fan and the hydraulic continuously variable transmission can be easily maintained by releasing the connection of the universal joint, and a transmission mechanism with better durability and transmission performance than the belt interlocking mechanism can be constructed. You can

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. In the present embodiment, a riding rice transplanter is shown in which a planting section having a seedling table and a planting claw is installed in a traveling vehicle to continuously perform rice planting work, but it is applied to various mobile agricultural machines such as tractors and combine harvesters. Of course, it is okay.

FIG. 1 is a side view of the whole, and FIG. 2 is a plan view of the same. The planting part 3 is mounted on the rear side of the traveling vehicle 1 via the link mechanism 2 so as to be movable up and down. In addition, the planting part 3 mounts a lateral strip fertilizer applicator 4 for filling fertilizer on the side of the planting plant to be planted on the rear upper surface of the traveling vehicle 1, and includes front and rear wheels 5 and 6, a driver's seat 7, a steering wheel. 8 is provided in the traveling vehicle 1. Also, front and rear wheels 5.6
Is placed below step 9 of forming the vehicle body cover,
The steering handle 8 is arranged on the rear side of the hood 10 on the front side of the step 9. The driver's seat 7 is disposed on the upper surface on the rear side of step 9.

In the rice planting work, a seedling table 11 for planting 5 rows and a planting claw 12 are provided in the planting section 3 to continuously carry out 5 rows of seedlings and to the side of the 5 rows of seedlings. Blower 13 in the soil
The fertilization work is carried out by sending the fertilizer from the fertilizer applicator 4 through the transport hose 14 for five lines and burying the fertilizer. Further, the spare seedlings of the spare seedling stand 15 on the side of the bonnet 10 are supplied to the seedling stand 11 to continue the rice planting work.

FIG. 3 is a perspective explanatory view showing the frame structure of the traveling vehicle 1, and FIG. 4 is a plan view of the same. The traveling vehicle 1 includes a pair of left and right main frames 16 and forms a main frame 16 by connecting a front frame 17, a middle frame 18, and a rear frame 19 in a substantially linear shape in a plan view. Further, the left and right rear frames 19 have a portal frame 20 on the rear side thereof.
The left and right front frames 17 fix the front bumper 22 and the tow hook 23 to which the center marker 21 is attached on the front side.

Further, a pair of left and right step stands 24, 25, and 26 are fixed to the outer sides of the front and rear portions of the front frame 17 and the outer sides of the front portion of the rear frame 19, and the entire width in the left-right direction is provided above the middle portion of the rear frame 19. The long step stand 27 is fixed to the table. The pair of left and right step stands 28 are fixed to the upper side of the portal frame 20 and the left and right step stands 2 are provided.
A horizontal frame 30 having 9 is provided.

The outsides of the step stands 24 to 26 are connected by a front side frame 31.
27 and the outside of the horizontal frame 30 are the rear side frames 3
Connect by 2. The step 9 is mounted and fixed on the upper surfaces of the step stands 24 to 29, and the step-on / off step 33 is detachably bolted and fixed to the outer side of the rear side frame 32.

Next, the power transmission mechanism of 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 pedestals 34 and frame members 35 are fixed to the left and right front frames 17 to mount an engine 36, and left and right front axle cases 38 are fixed to both sides of a mission case 37. The front wheels 5 are attached to each case 38, and the middle frame 18 connecting the front and rear frames 17 and 19 is fixed to the upper side of the case 38.

On the front side of the mission case 37, a hydraulic continuously variable transmission (hereinafter referred to as HST) 39 for transmitting the output of the engine 36 to the mission case 37 and the steering force of the front wheels 5 of the steering wheel 8 are amplified. A steering case 40 including a torque generator and 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.

A hydraulic lifting cylinder 43 is attached to the upper side of the machine case 41, and the piston of the cylinder 43 is connected to the link mechanism 2 that supports the planting section 3 so as to be lifted and lowered.

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 for supplying the fuel to the engine 36 is fixed to the base frame 44. Let Further, the tank 45 is installed between the left and right rear frames 19, and as shown in FIG.
As described above, the seat frame 46 is erected on the rear frame 19.

On the upper side of the seat frame 46, the seat base 4 is provided.
The driver's seat 7 is attached via 7 and the driver's seat 7 is arranged above the front part of the tank 45. Also, the left step stand 2
The muffler 4 of the engine 36 is attached via a stay 48 to the lower surface side of the left front side frame 31 to be supported by 4 ・ 25.
Install 9. On the other hand, on the right front side frame 31 supported by the right step stand 24/25, the battery stand 5
Fix 0.

FIG. 6 is a perspective view of the vicinity of the engine 36, and FIG.
Includes a bottom plate 51 and an HST provided at the bottom of the engine for mounting the engine 36 on the pedestal 34 and the frame member 35.
39 is a lower perspective view, and FIG. 8 is a perspective view of the engine 36 as viewed from the left rear. The engine 36 is provided with the following mechanism for supplying / exhausting air during combustion. Air is supplied to the engine from the intake port 70 through 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 36b, and is discharged to the outside from the exhaust port 75 via the pipe line 74 and the muffler 49. Further, the engine cooling air is supplied to the cooling air intake portion 76 of the engine 36 main unit.
Inhaled from.

The bearing cylinder 52 is detachably fixed to the lower surface of the bottom plate 51 at the bottom of the engine 36 by bolts.
2, the transmission shaft 57 is rotatably supported, and the pulley 53.5
4 and the belt 55, the output shaft 5 on the front side of the engine 36
6, the front end of the transmission shaft 57 is connected.

Conventionally, the bearing tube which supports the transmission shaft is welded and fixed to the bottom plate and the like, and there is a problem that 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 by bolts, the bearing can be removed for bearing replacement or lubrication work, thus improving maintainability. Further, the bearing cylinder 52 is provided with an oil injection port 64 so that oil can be directly injected from the bottom surface side to further improve maintainability.

The rear end 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, on the HST input shaft 62, a cooling fan 63 for cooling the HST 39 by air cooling is fixedly provided immediately after the universal joint 60, and is blown toward the rear HST 39 as the HST input shaft 62 rotates. It is like this.

The HST input shaft 62 is a cooling fan 6
3 and spline processing is performed to make the universal joint slidable. Further, as described above, the cooling fan 63 and the universal joint 60 are slidable on the HST input shaft.
Removed from above the T input shaft 62, cooling fan 63 and HS
Maintenance of T39 can be easily performed.

The power of the engine 36 is transmitted to the HST 39 through the transmission shaft 57 and the transmission case 37
The PTO shaft 65 is extended rearward from the rear side to transmit power to the planting section 3, and the rear drive shaft 66 from the mission case 37.
To the rear and let it enter the rear axle case 42,
Power is transmitted from the transmission case 37 to the rear wheels 6 via the rear axle case 42. Also, mission case 37
Power is transmitted to the front wheels 5 from the front axle case 38. The power transmission mechanism of this embodiment is as described above.

As is apparent from FIG. 8, the HST 39 and the cooling fan 63 are located in the lower rear part of the cooling air intake part 76 of the engine 36, and both are in the vicinity position. As described above, the cooling air intake portion 76 sucks the cool air from the outside, and is a portion having a relatively low temperature in the vicinity of the engine 36 where the temperature tends to be high.

Therefore, by arranging the cooling air intake portion 76 and the HST 39 / cooling fan 63 in the vicinity of each other and arranging the cooling fan 63 on the windward side of the airflow as in the present construction, the outside cool air is prevented. It is easily supplied to the cooling fan 63, and as a result, the cooling efficiency of the HST 39 is significantly improved. Further, in this configuration, the HST 39 main body can be cooled not only by the air blow by the cooling fan 63 but also by the air flow by the suction of the cooling air intake portion 76. Further, since the cooling fan 63, the HST 39, and part of the mission case 37 are located substantially on the same line, the cool air blown by the cooling fan 63 is effective not only for cooling the HST 39 but also for the mission case 37.

The above structure also contributes to improving 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 portion 76 and the cooling fan 63 through which the outside cool air is sucked in. It is located on the opposite right side across the engine 36. Especially, the muffler 49 which becomes high in temperature is arranged near the left end portion of the front frame 17 so that the worker in the driver's seat 7 sucks the exhaust air and prevents the working environment from being deteriorated by heat, and is effective by the outside cool air. Dissipates heat. Further, on the low temperature side, cold air is sucked by the cooling air intake portion 76 to secure an air flow path from the low temperature side to the high temperature side around the engine 36. Then, the worker can work on a safe and comfortable low temperature side.

In order to improve the maintainability of the engine 36 and the like, the traveling vehicle 1 in this embodiment is constructed 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 stands upright from the front bumper 22, bends rearward from an intermediate position, and is further installed horizontally at the upper end toward the rear. The bonnet 10 is configured to cover along the bonnet support frame 80, and the hook 81 at the lower front end facing the front of the traveling vehicle 1 is engaged with the engaging portion 22a of the front bumper 22, while the rear surface of the bonnet 10 is engaged. To the left bonnet support frame 80.
It is locked and fixed by the release lever 83 attached to the horizontal part of the.

The release lever 83 is operated by the bonnet 1
0 The lid 84 to be mounted on the upper side is opened, and the worker pulls the handle portion 83a of the release lever 83 from the front toward the front of the traveling vehicle 1, so that the locking portion 83b of the release lever falls backward and the bonnet The engaging member 82 is disengaged. The operator can easily remove the bonnet by pulling the bonnet 10 toward you.

On the contrary, when the bonnet 10 is mounted, the engaging member 82 is engaged because the release lever 83 is biased by the spring 83c by pushing the hook 81 and then pushing the upper part of the bonnet 10. The stopper 83b is locked. As described above, the lid 84 is provided at the upper end position of the bonnet 10.
Release lever 8 to a position where it can be operated immediately when is released.
Since 3 is provided, it is possible to realize a highly safe configuration that has good operability, does not impair the design, and does not cause the bonnet to open unexpectedly due to external interference or the like.

[0032]

According to the present invention, the following effects can be obtained. That is, by arranging the intake part of the cooling air of the engine, which easily sucks the outside cool air, in the vicinity of the cooling fan of the hydraulic continuously variable transmission, the cooling fan cools the members of 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 the hydraulic continuously variable transmission is installed on the intake side of the cooling air in the engine, while the engine is sandwiched from the hot exhaust side, so the high temperature side and the low temperature side are opposite. It is possible to improve the heat balance, and eventually the output, by dividing with.

The cooling fan of the hydraulic continuously variable transmission is arranged at the spline portion of the input shaft of the hydraulic continuously variable transmission, and the universal joint fitted with the spline is interlocked for connection, so that the universal joint can be easily removed. This is possible and contributes to the improvement of maintainability of the cooling fan and HST.

[Brief description of 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 bottom 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 hood.

[Explanation of symbols]

36 engine 36b discharge part 49 muffler 51 bottom plate 60 universal joint 63 Cooling fan 70 Inlet 71 Air pipeline 72 Air cleaner 73 pipelines 74 conduit 75 exhaust port 76 Engine cooling air intake

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3D039 AA04 AA20 AB12 AB13 AB14                       AC33 AD22 AD25 AD46 AD53                 3D042 AA05 AB12 BA02 BA17 BB01                 3J063 AA13 AB44 AC03 BA15 CA01                       XH05 XH13 XH23 XH25 XH42

Claims (3)

[Claims] 1. A mobile agricultural machine for transmitting motive power from an engine through a hydraulic continuously variable transmission, comprising at least a cooling fan for cooling the hydraulic continuously variable transmission together with the hydraulic continuously variable transmission. In the configuration including, the cooling fan is arranged in the vicinity of the intake portion of the cooling air of the engine,
A mobile agricultural machine characterized in that it is located opposite to the exhaust section of the engine with at least a part of the engine body sandwiched therebetween. 2. A mobile agricultural machine for transmitting motive power from an engine through a hydraulic continuously variable transmission, and a cooling fan for cooling at least the hydraulic continuously variable transmission together with the hydraulic continuously variable transmission. A mobile agricultural machine comprising the cooling fan provided in front of the hydraulic continuously variable transmission and behind the intake portion of the engine cooling air. 3. A mobile agricultural machine for transmitting motive power from an engine through a hydraulic continuously variable transmission, comprising at least a cooling fan for cooling the hydraulic continuously variable transmission together with the hydraulic continuously variable transmission. In the configuration, 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 for connecting the input shaft and the output shaft of the engine is slid. A mobile agricultural machine characterized by being movably connected.