JP2001199251A - Motor unit cooling structure for working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently cool down a hydrostatic continuously variable transmission arranged in an engine mounted in a traveling machine body with its output shaft positioned laterally or in either of the front and the back of the engine by means of a comparatively simple and reasonable improvement. SOLUTION: Engines 23, 50 provided with a first cooling fan 41 are mounted in a traveling machine body 1 with their output shafts 23a, 50a positioned laterally, and a second cooling fan 48 is mounted to an input shaft 24a in a static hydraulic continuously variable transmission 24 transmitted and connected to the output shafts 23a, 50a via a belt type transmission mechanism 25. The cooling air flowing direction by the first cooling fan 41 and that by the second cooling fan 48 are matched with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling structure for a driving part of a working vehicle in which an engine is mounted on a traveling machine body such that an output shaft thereof is directed left and right.

[0002]

2. Description of the Related Art Conventionally, as a driving part cooling structure for a working vehicle as described above, for example, as disclosed in Japanese Patent Application Laid-Open No. 9-300985, cooling generated by the operation of a cooling fan provided in an engine is disclosed. The driving part was cooled by wind.

By the way, when the engine is mounted on the traveling body with its output shaft oriented to the left and right, the engine and the cooling fan driven by its output can be arranged side by side. Compared to the case where the output shaft is mounted on the traveling fuselage with the output shaft facing forward and the engine and the cooling fan are arranged side by side, the front-rear length of the driving unit and the overall length of the aircraft can be shortened. Therefore, in the case where the prime mover is provided in front of the boarding operation section, the visibility in front of the boarding operation section can be improved, so that the workability can be improved. ) Can be reduced.

[0004]

Some work vehicles are equipped with a hydrostatic continuously variable transmission. However, the hydrostatic continuously variable transmission is located between the front and rear of the engine because of the space required for the prime mover. It will be arranged in either one. Therefore, when the engine is mounted on the traveling machine body with the output shaft oriented left and right, and the working vehicle equipped with the hydrostatic continuously variable transmission employs the above-described prior art driving part cooling structure, the cooling fan The engine located on one side of the side can sufficiently supply the cooling air generated by the operation of its cooling fan, while the hydrostatic type continuously variable transmission installed on either side of the engine Although it is difficult to supply the cooling air, the engine can be suitably cooled, but it has been difficult to suppress the heating of the hydrostatic continuously variable transmission.

SUMMARY OF THE INVENTION An object of the present invention is a relatively simple and rational improvement, in which an engine mounted on a traveling machine body with an output shaft facing left and right, and a hydrostatic type engine disposed at one of the front and rear thereof. An object of the present invention is to make it possible to effectively cool a continuously variable transmission.

[0006]

In order to achieve the above object, according to the first aspect of the present invention, an engine having a first cooling fan is provided such that an output shaft of the engine is oriented left and right. A second cooling fan is mounted on the input shaft of the hydrostatic stepless transmission that is mounted on the traveling body and is connected to the output shaft through a belt-type transmission mechanism, and the cooling air is cooled by the first cooling fan. The flow direction was made to coincide with the flow direction of the cooling air flow from the second cooling fan.

According to the first aspect of the invention, the engine is supplied with cooling air generated by the operation of the first cooling fan provided on one side of the engine. The cooling air generated by the operation of the second cooling fan mounted on the input shaft is supplied to the hydrostatic stepless transmission which is disposed at one of the front and rear sides.

In addition, by making the flow direction of the cooling air flow by the first cooling fan coincide with the flow direction of the cooling air flow by the second cooling fan, the flow directions of the cooling air are set to be opposite to each other. To solve the inconvenience that generated cooling air cancels out the flow of each other, so that the cooling exhaust air after taking heat of the engine and the hydrostatic continuously variable transmission is easily hidden in the engine room, etc. In addition to the above, the flow of the cooling air generated by the operation of the first cooling fan on the engine side makes it possible to easily discharge the cooling exhaust air after cooling the hydrostatic continuously variable transmission to the outside of the machine, Conversely, the flow of the cooling air generated by the operation of the second cooling fan on the hydrostatic continuously variable transmission side makes it easier to discharge the cooling exhaust air after cooling the engine out of the machine. It becomes so that.

[Effects] Therefore, a relatively simple improvement in which the second cooling fan is mounted on the input shaft of the hydrostatic continuously variable transmission in addition to the first cooling fan originally provided in the engine, Cooling air can be sufficiently supplied to the engine and the hydrostatic continuously variable transmission, and furthermore, the flow direction of the cooling air flow by the first cooling fan and the flow direction of the cooling air flow by the second cooling fan are matched. With the rational improvement described above, the synergistic effect of the cooling air from the first cooling fan and the cooling air from the second cooling fan can efficiently discharge the cooling exhaust air to the outside of the machine. The device can be cooled effectively.

[Structure] In order to achieve the above object, according to the second aspect of the present invention, an engine mounted on a traveling machine body with an output shaft oriented to the left and right, and an engine mounted on one lateral side of the engine. A first cooling fan is disposed between the radiator and a radiator, and a second cooling fan is mounted on an input shaft of a hydrostatic continuously variable transmission that is operatively connected to the output shaft via a belt-type transmission mechanism. The flow direction of the cooling air flow from the first cooling fan is made to coincide with the flow direction of the cooling air flow from the second cooling fan, and is extended from the engine so as to pass through the hydrostatic stepless transmission. A shielding plate was provided between the exhaust pipe and the hydrostatic continuously variable transmission.

According to the second aspect of the invention, the engine, the radiator, and the exhaust pipe are supplied with the cooling air generated by the operation of the first cooling fan disposed between the engine and the radiator. The hydrostatic continuously variable transmission, which is disposed either before or after the engine, has cooling air generated by the operation of a second cooling fan mounted on its input shaft. Will be supplied.

In addition, by making the flow direction of the cooling air flow by the first cooling fan coincide with the flow direction of the cooling air flow by the second cooling fan, the flow directions of the cooling air are set to be opposite to each other. This eliminates the disadvantage that the cooling air generated by each other cancels out the flow of each other, and thereby the cooling exhaust air after depriving the heat of the engine and the hydrostatic continuously variable transmission is easily hidden in the engine room. On the engine side
The flow of the cooling air generated by the operation of the cooling fan makes it easier to discharge the cooling exhaust air after cooling the hydrostatic continuously variable transmission to the outside of the machine, and conversely, the hydrostatic continuously variable transmission. By the flow of the cooling air generated by the operation of the second cooling fan on the transmission side, the cooling exhaust air after cooling the engine and the like can be easily discharged to the outside of the machine.

In addition, by providing a shielding plate between the exhaust pipe and the hydrostatic continuously variable transmission, the cooling air considerably heated by depriving the exhaust pipe of heat can be used for the hydrostatic continuously variable transmission. It can be discharged out of the machine without the inconvenience of flowing to the side.

[Effect] Accordingly, in addition to the first cooling fan originally provided between the engine and the radiator, the second cooling fan is mounted on the input shaft of the hydrostatic continuously variable transmission, and the exhaust gas is exhausted. A relatively simple improvement, such as providing a shield plate between the pipe and the hydrostatic continuously variable transmission, allows sufficient supply of cooling air to the engine and the hydrostatic continuously variable transmission, as well as the exhaust pipe. It is possible to prevent a decrease in the cooling capacity of the hydrostatic continuously variable transmission caused by the flow of the cooling air, which has become considerably hot due to the deprivation of heat, to the hydrostatic continuously variable transmission, and further, the cooling by the first cooling fan With the rational improvement of matching the flow direction of the wind and the flow direction of the cooling air flow by the second cooling fan, the cooling exhaust air is cooled by the synergistic effect of the cooling air flow by the first cooling fan and the cooling air flow by the second cooling fan. Effective for spitting out From be better carried out as in,
Cooling of engines and hydrostatic continuously variable transmissions can now be performed effectively.

[Structure] In order to achieve the above object, according to the third aspect of the present invention, an engine provided with a first cooling fan is mounted on a traveling machine body with an output shaft of which is oriented left and right. A second cooling fan is mounted on an input shaft of a hydrostatic continuously variable transmission that is operatively connected to the output shaft via a belt-type transmission mechanism, and the second cooling fan is mounted on the input shaft of the hydrostatic continuously variable transmission with the engine interposed therebetween. A wind guide plate for circulating the cooling air from the first cooling fan around the cylinder head,
The flow direction of the cooling air by the first cooling fan and the second
The direction of flow of the cooling air from the cooling fan was made to coincide with the direction of flow of the cooling air, and a shield plate was provided between the engine and the hydrostatic continuously variable transmission.

According to the third aspect of the invention, the engine is supplied with cooling air generated by the operation of the first cooling fan provided on one side of the engine. The cooling air generated by the operation of the second cooling fan mounted on the input shaft is supplied to the hydrostatic stepless transmission which is disposed at one of the front and rear sides.

Moreover, by making the flow direction of the cooling air flow by the first cooling fan coincide with the flowing direction of the cooling air flow by the second cooling fan, the flow directions of the cooling air are set to be opposite to each other. To solve the inconvenience that generated cooling air cancels out the flow of each other, so that the cooling exhaust air after taking heat of the engine and the hydrostatic continuously variable transmission is easily hidden in the engine room, etc. In addition to the above, the flow of the cooling air generated by the operation of the first cooling fan on the engine side makes it possible to easily discharge the cooling exhaust air after cooling the hydrostatic continuously variable transmission to the outside of the machine, Conversely, the flow of the cooling air generated by the operation of the second cooling fan on the hydrostatic continuously variable transmission side makes it easier to discharge the cooling exhaust air after cooling the engine out of the machine. It becomes so that.

In addition, cooling air generated by the operation of the first cooling fan can be supplied to the cylinder head in a state of being circulated by the air guide plate disposed on the opposite side of the hydrostatic continuously variable transmission with the engine interposed therebetween. It is possible to suitably cool the engine by the cooling air, and furthermore, by using a shielding plate provided between the engine and the hydrostatic continuously variable transmission, the cooling air heated by depriving the cylinder head of heat is cooled. It is possible to discharge the fluid to the outside of the machine without inconvenience flowing to the hydrostatic continuously variable transmission.

[Effect] Accordingly, in addition to the first cooling fan originally provided in the engine, the second cooling fan is mounted on the input shaft of the hydrostatic continuously variable transmission, and the hydrostatic continuously variable transmission is provided. A relatively simple improvement, such as installing a baffle plate on the opposite side of the device across the engine and providing a shield plate between the engine and the hydrostatic continuously variable transmission, enables the engine and hydrostatic continuously variable transmission. In addition to being able to supply cooling air to the device sufficiently, cooling for the hydrostatic continuously variable transmission is caused by the cooling air heated by removing heat from the cylinder head and flowing to the hydrostatic continuously variable transmission. A reduction in capacity can be prevented, and furthermore, with a rational improvement such that the flow direction of the cooling air flow from the first cooling fan matches the flow direction of the cooling air flow from the second cooling fan, the cooling air flow from the first cooling fan 2 cooling fan The discharged to the outside of the cooling wind exhaust synergy of the cooling air from becoming allow efficiently by, now allow the cooling of the engine and the hydrostatic continuously variable transmission effectively.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] FIG. 1 shows an overall side view of a riding type rice transplanter which is an example of a work vehicle, and FIG. 2 shows an overall plan view thereof. The seedling planting device 4 is connected to the rear of the traveling body 1 configured as a riding type via a link mechanism 3 that moves up and down by the operation of the hydraulic cylinder 2 so as to be able to move up and down, and the fertilizer application device 5 is mounted. It is constituted by.

The traveling body 1 has a prime mover 6 disposed at a front portion thereof, a boarding driving portion 7 formed at a rear portion thereof, and a pair of left and right front wheels 8 driven by traveling power from the prime mover 6. And the rear wheel 9.

The seedling planting device 4 includes a feed case 10 and a feed case 1 to which work power from the prime mover 6 is transmitted.
A seedling table 11 that reciprocates in a predetermined stroke in the left-right direction with distributed power from 0, and a plurality of plants that take out a predetermined amount of seedlings placed on the seedling table 11 with distributed power from the feed case 10 and plant them in a field. It comprises an attachment mechanism 12, and a plurality of leveling floats 13 for leveling a seedling planting location by each planting mechanism 12 in advance.

The fertilizer applicator 5 includes a hopper 1 for storing fertilizer.
4. A plurality of feeding mechanisms 1 for feeding the fertilizer in the hopper 14 by a predetermined amount for each planting line by the working power from the prime mover 6.
5, an electric fan 16 for generating an air flow for pumping the fed fertilizer, a plurality of guide hoses 17 for guiding the fed fertilizer, and a plurality of groovers 18 for burying the guided fertilizer in a field. It is constituted by such as.

As shown in FIG. 1 and FIGS.
A water-cooled engine 23 supported via a vibration-proof rubber 22 on a transmission case 20 connected to the front ends of a pair of left and right main frames 19, and a front frame 21 extending forward from the transmission case 20. A hydrostatic continuously variable transmission 24 connected to the left side of the transmission case 20;
And a belt-type transmission mechanism 25 that interlocks and links the output shaft 23a of the engine 23 and the input shaft 24a of the hydrostatic continuously variable transmission 24.

A torque generator 27 for hydraulic power steering is provided on an upper portion of the transmission case 20 in conjunction with a steering shaft 26a of a steering wheel 26 for steering the left and right front wheels 8, and an upper surface of the torque generator 27 is provided. The support frame 28 is connected, and the support frame 2
8, a handle post 29 for supporting the steering wheel 26 is provided upright.
The control panel 31 is connected to the control panel 31 via the “0”. Support frame 2
8, a substantially U-shaped support member 32 is connected so that both ends thereof extend forward and upward in the left and right directions, and the right and left extending ends of the support member 32 are connected to the engine. 23
A fuel tank 33 disposed above the motor unit 6 and a rear hood 34 that covers the upper part of the driving unit 6 from the rear side are bolted together, and a front bonnet 35 that covers the upper part of the driving unit 6 from the front side extends vertically. It is supported to be able to swing open and close. The control panel 31, the rear hood 34, and the front hood 35 form an engine room 36 that houses the driving unit 6 and the fuel tank 33.

As shown in FIG. 1 and FIG.
Is constituted by a steering wheel 26, a driver seat 37 disposed behind the steering wheel 26, and a boarding step 38 supported by the left and right main frames 19. From the boarding step 38, a pair of left and right getting on and off steps 39 enabling getting on and off from the front of the fuselage.
Extends forward.

As shown in FIGS. 3 to 6, in the driving unit 6, the engine 23 is mounted so that its output shaft 23a is oriented leftward and rightward.
Is set up so as to face the engine 23, and the engine 2
A first cooling fan 41 driven by power from the engine 23 is provided between the radiator 3 and the radiator 40. That is, the engine 23, the radiator 40, and the first cooling fan 41 are mounted in the engine room 3 by mounting the engine 23 with the output shaft 23a facing left and right.
6 so that they can be arranged in a state where they are arranged side by side. This makes it possible to shorten the front-rear length of the driving unit 6 as compared with the case where they are arranged back and forth. Has the advantage that it is possible to improve the workability by improving the visibility in front of the vehicle, to shorten the overall length of the aircraft, and to reduce the headland space required when the aircraft turns in a field. .

A carburetor 42 and an air cleaner 43 are provided at a front portion of the engine 23, and an exhaust manifold 44 is provided at a rear portion of the engine 23. An exhaust manifold 44 is provided with a hydrostatic continuously variable transmission 2 at the rear side of the engine 23.
A muffler 46 disposed forward and rearward at the lower left of the engine 23 is connected via an exhaust pipe 45 passing through the four sides.
The muffler 46 exhausts air from the left end of the fuselage toward the lower left outside.

The first cooling fan 41 is driven by the power of the engine 23 to use outside air as cooling air to form a plurality of first cooling fans 41 formed on the right side of the front bonnet 35.
After being taken into the engine room 36 from the intake port 35a and flowing toward the radiator 40 and the engine 23, a plurality of exhaust ports 35b formed on the left side of the front hood 35 as cooling exhaust air, and a lower left side of the body. From the head to the outside of the machine. Also, the first cooling fan 4
A part of the cooling air generated by the operation 1 is guided around the exhaust manifold 44 by the air guide plate 47 that covers the exhaust manifold 44 from above, and is directed along the exhaust pipe 45 toward the lower left muffler 46. It is being led. That is, the cooling air generated by the operation of the first cooling fan 41 causes the engine 23, the radiator 40, the exhaust manifold 44, and the exhaust pipe 4 disposed around the engine 23.
5, the muffler 46, etc. can be cooled.

The input shaft 24a of the hydrostatic continuously variable transmission 24
, A second cooling fan 48 is mounted so as to rotate integrally with the input shaft 24a. The second cooling fan 48
Engine 23 transmitted via belt-type transmission mechanism 25
, The outside air is taken into the engine room 36 from a plurality of second intake ports 34a formed on the right side of the rear bonnet 34 as cooling air, and the hydrostatic continuously variable transmission 24, etc. After the air is flowed toward the airframe, the air is discharged from the lower left side of the airframe to the outside as the cooling exhaust air. That is, the hydrostatic continuously variable transmission 24 can be cooled by the cooling air generated by the operation of the second cooling fan 48. Also, a hydrostatic continuously variable transmission 24 and an exhaust manifold 4 on the engine 23 side are provided.
Between the exhaust pipe 4 and the exhaust pipe 45, a shielding plate 49 supported and connected to the support frame 28 is provided. The shielding plate 49 removes heat from the exhaust manifold 44 and the exhaust pipe 45, and becomes considerably hot. It is possible to prevent the cooling capacity of the hydrostatic continuously variable transmission 24 from decreasing due to the flow of the cooling air flowing toward the hydrostatic continuously variable transmission 24.

From the above configuration, the flow direction of the cooling air flow from the first cooling fan 41 and the flow direction of the cooling air flow from the second cooling fan 48 coincide with each other. With the flow of the cooling air generated by the operation of the first cooling fan 41, the cooling exhaust air is discharged from the lower left side of the body to the outside after cooling the hydrostatic continuously variable transmission 24 by the operation of the second cooling fan 48. Can be promoted, and conversely, the hydrostatic continuously variable transmission 2
By the flow of the cooling air by the operation of the second cooling fan 48 on the fourth side, the cooling air discharged from the exhaust port 35b of the cooling air discharged after the engine 23 and the like are cooled by the operation of the first cooling fan 41 and the air from the lower left side of the airframe. As a result, the cooling air exhausted after the heat of the engine 23, the hydrostatic continuously variable transmission 24, etc. is taken away is hidden in the engine room 36 and the lower part of the fuselage. Since the decrease in the cooling efficiency due to this can be greatly suppressed, the cooling of the engine 23, the hydrostatic continuously variable transmission 24, and the like can be effectively performed.

[Second Embodiment] The second embodiment differs from the first embodiment in the configuration of the driving unit 6, and therefore only the configuration of the driving unit 6 will be described below.

As shown in FIGS. 7 and 8, the driving unit 6
A transmission case 20 connected to the front ends of a pair of left and right main frames 19 (see FIG. 1), and a front frame 21 extending forward from the transmission case 20 is attached to a vibration isolating rubber 2.
2, an air-cooled engine 50 supported by the engine 2, a hydrostatic continuously variable transmission 24 connected to the left side of the transmission case 20, and an output shaft 50 a of the engine 50 and the hydrostatic continuously variable transmission 24. It is constituted by a belt-type transmission mechanism 25 that interlocks and connects the input shaft 24a.

A torque generator 27 for hydraulic power steering is provided on an upper portion of the transmission case 20 in conjunction with a steering shaft 26 a of a steering wheel 26 for steering the left and right front wheels 8. The support frame 28 is connected, and the support frame 2
8, a handle post 29 for supporting the steering wheel 26 is provided upright.
The control panel 31 is connected to the control panel 31 via the “0”. Support frame 2
8, a substantially U-shaped support member 32 is connected so that both ends thereof extend forward and upward in the left and right directions, and the right and left extending ends of the support member 32 are connected to the engine. 23
A fuel tank 33 disposed above the motor unit 6 and a rear hood 34 that covers the upper part of the driving unit 6 from the rear side are bolted together, and a front bonnet 35 that covers the upper part of the driving unit 6 from the front side extends vertically. It is supported to be able to swing open and close. The control panel 31, the rear hood 34, and the front hood 35 form an engine room 36 that houses the driving unit 6 and the fuel tank 33.

In the driving unit 6, the engine 50 is mounted so that its output shaft 50a faces left and right, and a first cooling fan 41 driven by power from the engine 23 is provided on the right side thereof. ing. That is, the engine 50 and the first cooling fan 41 can be arranged side by side in the engine room 36 by mounting the engine 50 with the output shaft 50a facing left and right. This makes it possible to shorten the front-rear length of the driving unit 6 as compared with the case of arranging them back and forth, so that the forward view from the boarding operation unit 7 can be improved, and workability can be improved. In addition to this, there is an advantage that the total length of the airframe can be shortened and the headland space required for turning the airframe in a field can be reduced.

At the rear of the engine 50, a carburetor 51 and an air cleaner 52 are provided. An exhaust pipe 53 extending to the lower left is connected to the left side of the cylinder head 50A of the engine 50, and a muffler disposed forward and rearward at the lower left of the engine 50 is provided at the extending end. The muffler 54 is configured to exhaust air from the rear left side of the belt-type transmission mechanism 25 toward the lower left outside.

The first cooling fan 41 is driven by the power of the engine 50 to use outside air as cooling air to form a plurality of first cooling fans 41 formed on the right side of the front bonnet 35.
After being taken into the engine room 36 from the intake port 35a and flowing toward the engine 50 and the like, a plurality of exhaust ports 35b formed on the left side surface of the front hood 35 and cooling air from the lower left side of the body as cooling exhaust air. It is designed to spit out. A part of the cooling air generated by the operation of the first cooling fan 41 is transmitted to the cylinder head 50A at the front side of the engine 50 of the hydrostatic continuously variable transmission 24, which is located on the opposite side of the engine 50. The air guide plate 55 is provided so as to cover the exhaust pipe 53 from the front, and is guided around the cylinder head 50A by the exhaust pipe cover 56 surrounding the upper part of the exhaust pipe 53. It has become. That is, the cooling air generated by the operation of the first cooling fan 41 causes the engine 5
0 and the exhaust pipe 53 provided in the vicinity thereof can be cooled.

The input shaft 24a of the hydrostatic continuously variable transmission 24
, A second cooling fan 48 is mounted so as to rotate integrally with the input shaft 24a. The second cooling fan 48
Engine 50 transmitted via belt type transmission mechanism 25
, The outside air is taken into the engine room 36 from a plurality of second intake ports 34a formed on the right side of the rear bonnet 34 as cooling air, and the hydrostatic continuously variable transmission 24, etc. After the air is flowed toward the airframe, the air is discharged from the lower left side of the airframe to the outside as the cooling exhaust air. That is, the hydrostatic continuously variable transmission 24 can be cooled by the cooling air generated by the operation of the second cooling fan 48. Further, a shielding plate 57 is provided between the hydrostatic continuously variable transmission 24 and the engine 50, and the shielding plate 57 allows the cooling air, which has been considerably heated by depriving the cylinder head 50A of heat, to generate heat. The guide function of the air guide plate 55 prevents the cooling capacity of the hydrostatic continuously variable transmission 24 from decreasing due to the flow toward the hydrostatic continuously variable transmission 24.

From the above configuration, the flow direction of the cooling air flow from the first cooling fan 41 and the flow direction of the cooling air flow from the second cooling fan 48 coincide with each other. With the flow of the cooling air generated by the operation of the first cooling fan 41, the cooling exhaust air is discharged from the lower left side of the body to the outside after cooling the hydrostatic continuously variable transmission 24 by the operation of the second cooling fan 48. Can be promoted, and conversely, the hydrostatic continuously variable transmission 2
With the flow of the cooling air by the operation of the second cooling fan 48 on the fourth side, the cooling air discharged from the exhaust port 35b after cooling the engine 50 and the like by the operation of the first cooling fan 41 and the air from the lower left side of the airframe. As a result, the cooling air exhausted after the heat of the engine 50, the hydrostatic continuously variable transmission 24, etc. is taken away is hidden in the engine room 36 and the lower part of the fuselage. Since the decrease in the cooling efficiency due to this can be greatly suppressed, the cooling of the engine 50, the hydrostatic continuously variable transmission 24, and the like can be effectively performed.

[Other Embodiments] Other embodiments of the present invention will be listed below. The work vehicle may be a tractor, a mower or the like, or may be one in which the prime mover 6 is disposed at the rear of the machine. As the prime mover 6, a first cooling fan 41 may be provided on the left side of the engines 23 and 50. Belt-type transmission mechanism 25 mounted on input shaft 24a of hydrostatic continuously variable transmission 24 together with second cooling fan 48
A vent may be formed in the output pulley to promote the flow of the cooling air.

[Brief description of the drawings]

FIG. 1 is an overall side view of a riding rice transplanter.

FIG. 2 is an overall plan view of a riding rice transplanter.

FIG. 3 is a longitudinal sectional side view of a driving unit showing a driving unit cooling structure according to the first embodiment;

FIG. 4 is a cross-sectional plan view of the driving unit showing the driving unit cooling structure in the first embodiment.

FIG. 5 is a longitudinal sectional front view of a driving unit showing a driving unit cooling structure according to the first embodiment;

FIG. 6 is a longitudinal rear view of a driving unit showing a driving unit cooling structure according to the first embodiment;

FIG. 7 is a longitudinal sectional side view of a driving part showing a driving part cooling structure in a second embodiment.

FIG. 8 is a cross-sectional plan view of a driving unit showing a driving unit cooling structure according to a second embodiment.

[Explanation of symbols]

 Reference Signs List 1 traveling body 23 engine 23a output shaft 24 hydrostatic stepless transmission 24a input shaft 25 belt type transmission mechanism 40 radiator 41 first cooling fan 45 exhaust pipe 48 second cooling fan 49 shielding plate 50 engine 50a output shaft 50A cylinder head 55 Wind guide plate 57 Shield plate

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Takeshi Mukai 64 Ishizukita-cho, Sakai City, Osaka Prefecture Inside the Kubota Sakai Plant (72) Inventor Makoto Yamashita 64 Ishizukita-cho, Sakai City, Osaka Prefecture Kubota Sakai Manufacturing Co., Ltd. In-house (72) Inventor Naoki Matsuki 64 Ishizukita-cho, Sakai City, Osaka Prefecture Inside Kubota Sakai Plant (72) Inventor Takashi Shimizu 64-Ishizukita-machi Sakai City, Osaka Prefecture F-term in Kubota Sakai Plant Co., Ltd. 3D035 BA02 CA19 CA25 3D038 AA05 AB06 AC12 3D039 AA03 AA20 AA23 AB14 AC21 AC33 AD11 AD22 AD26 AD54

Claims (3)

[Claims] 1. A hydrostatic steplessly mounted engine having a first cooling fan mounted on a traveling machine body with an output shaft thereof facing left and right, and being operatively connected to the output shaft via a belt type transmission mechanism. A second cooling fan is mounted on the input shaft of the transmission,
The flow direction of the cooling air by the first cooling fan and the second
A driving part cooling structure for a working vehicle in which the direction of flow of cooling air by the cooling fan is matched. 2. A first cooling fan is disposed between an engine mounted on a traveling vehicle body with an output shaft oriented left and right and a radiator disposed laterally on one side of the engine. A second cooling fan is mounted on an input shaft of a hydrostatic continuously variable transmission that is transmission-connected via a belt-type transmission mechanism, and a flow direction of cooling air by the first cooling fan and a cooling air by the second cooling fan. And the flow direction of
A driving part cooling structure for a working vehicle, wherein a shielding plate is provided between an exhaust pipe extending from the engine to the hydrostatic stepless transmission side and the hydrostatic stepless transmission. 3. A hydrostatic stepless engine having an engine equipped with a first cooling fan mounted on a traveling body with its output shaft facing left and right, and being operatively connected to the output shaft via a belt-type transmission mechanism. A second cooling fan is mounted on the input shaft of the transmission,
On the opposite side of the hydrostatic type continuously variable transmission with the engine interposed therebetween, a baffle plate for circulating cooling air from the first cooling fan to a cylinder head is provided, and a flow direction of the cooling air from the first cooling fan is provided. And the cooling air flow direction of the second cooling fan is made to coincide with each other and a shield plate is provided between the engine and the hydrostatic continuously variable transmission.