Transmission

Abstract

The inventors noticed that conventional transmissions are not always user-friendly when it comes to utilizing their convenient functions. More specifically, the inventors noticed that operators sometimes have to verify whether the cooling operation of a transmission, such as an HST, is functioning properly. [Solution] The transmission 10 comprises a pulley section 20 that receives engine power transmitted from the engine pulley section, a transmission section 30 that changes the speed of the engine power received by the pulley section 20, and a first cooling fan section 40 that cools the transmission section 30. The first cooling fan section 40 is positioned between the pulley section 20 and the transmission section 30, and an outside air intake hole 20h is formed in the pulley section 20 so that outside air is drawn into the first cooling fan section 40.

Description

Technical Field

[0001] The present invention relates to a speed change device such as a rice transplanter.

Background Art

[0002] There is known a working machine including a traveling body equipped with an engine, an openable and closable bonnet covering the engine, a radiator disposed on one side of the engine within the bonnet, a shroud provided on the outer periphery of the radiator, and a shielding member for closing a gap between the shroud and the bonnet. The shielding member includes a first shielding member attached to the peripheral wall portion of the shroud and interrupted above the water supply port portion of the radiator, and a second shielding member attached to the bonnet and abutting against the interrupted portion of the first shielding member when the bonnet is in a closed state (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, the present inventor considers various needs of users and believes that the trend of continuously implementing convenient functions in speed change devices such as rice transplanters is accelerating more and more.

[0005] However, the present inventor has noticed that the usability when using convenient functions for conventional speed change devices is not always good.

[0006] More specifically, the present inventor has noticed that an operator sometimes has to check whether the cooling operation of a speed change device such as an HST is being performed smoothly.

[0007] The present invention aims to provide a transmission that can improve usability, taking into consideration the conventional problems described above. [Means for solving the problem]

[0008] The first aspect of the present invention is a pulley that receives engine power transmitted from the engine pulley, A gear shifting unit that shifts the engine power received by the pulley section, A first cooling fan unit for cooling the gear shifting unit, It is equipped with, The first cooling fan section is positioned between the pulley section and the gear shift section. The transmission is characterized in that an outside air intake hole is formed in the pulley portion so that outside air is drawn into the first cooling fan portion.

[0009] The second aspect of the present invention is a transmission device of the first aspect of the present invention, characterized in that the outside air intake hole narrows in the direction from the pulley portion toward the transmission portion.

[0010] The third aspect of the present invention is that the first cooling fan section is attached to the pulley section such that the rotating shaft member of the pulley section also functions as the rotating shaft member of the first cooling fan section. Multiple of the aforementioned outside air intake holes are formed in the pulley portion, The portion between adjacent outside air intake holes is formed as a plate member. The second transmission according to the present invention is characterized in that the plate member is tilted so that the outside air is drawn into the first cooling fan section.

[0011] The fourth aspect of the present invention further comprises a second cooling fan section for cooling the gear shift section, The third version of the transmission according to the present invention is characterized in that the pulley portion is arranged between the first cooling fan portion and the second cooling fan portion.

[0012] The fifth aspect of the present invention is that the second cooling fan section has a plurality of blade members and a central member to which the plurality of blade members are attached, The central member is connected to the pulley portion at a predetermined distance, An outside air intake hole is formed in the central member so that the outside air can be taken in. The fourth transmission of the present invention is characterized in that the outside air intake hole at least partially overlaps the outside air intake hole when viewed from the direction of the rotating shaft member.

[0013] The sixth aspect of the present invention is that the pulley section, the gear shift section, the first cooling fan section, and the second cooling fan section are arranged in the left-right direction of the vehicle body, Two parallel floor reinforcing rib members are provided on the underside of the step floor to reinforce the step floor. The longitudinal direction of the floor reinforcing rib member is in the left-right direction of the vehicle body. The fifth transmission according to the present invention is characterized in that the first cooling fan section is positioned between adjacent floor reinforcing rib members such that the direction in which the outside air is drawn into the first cooling fan section is in the left-right direction of the vehicle body. [Effects of the Invention]

[0014] The first aspect of this invention makes it possible to improve ease of use.

[0015] The second aspect of the present invention makes it possible to improve reliability in addition to the effects of the first aspect of the present invention.

[0016] The third aspect of the present invention makes it possible to improve convenience in addition to the effects of the second aspect of the present invention.

[0017] The fourth aspect of the present invention makes it possible to improve practicality in addition to the effects of the third aspect of the present invention.

[0018] The fifth aspect of the present invention makes it possible to simplify the configuration in addition to the effects of the fourth aspect of the present invention.

[0019] According to the sixth aspect of the present invention, in addition to the effects of the fifth aspect, the configuration can be further simplified.

Brief Description of the Drawings

[0020] [Figure 1] (a) Left side view of the rice transplanter according to an embodiment of the present invention, (b) Plan view of the rice transplanter according to an embodiment of the present invention [Figure 2] (a) Left side view of the transmission of the rice transplanter according to an embodiment of the present invention, (b) Plan view (Part 1) of the transmission of the rice transplanter according to an embodiment of the present invention [Figure 3] Perspective view (Part 1) of the pulley section of the transmission of the rice transplanter according to an embodiment of the present invention [Figure 4] (a) Left side view of the pulley section of the transmission of the rice transplanter according to an embodiment of the present invention, (b) Perspective view (Part 2) of the pulley section of the transmission of the rice transplanter according to an embodiment of the present invention [Figure 5] (a) Plan view (Part 2) of the transmission of the rice transplanter according to an embodiment of the present invention, (b) Perspective view (Part 1) of the transmission of the rice transplanter according to an embodiment of the present invention [Figure 6] Perspective view (Part 2) of the transmission of the rice transplanter according to an embodiment of the present invention [Figure 7] (a) Partial bottom view of the rice transplanter according to an embodiment of the present invention, (b) Partial perspective view of the rice transplanter according to an embodiment of the present invention [Figure 8] Explanatory drawing (Part 1) of the rice transplanter according to the first modification example of an embodiment of the present invention [Figure 9] (a) Explanatory drawing (Part 2) of the rice transplanter according to the first modification example of an embodiment of the present invention, (b) Explanatory drawing (Part 3) of the rice transplanter according to the first modification example of an embodiment of the present invention, (c) Explanatory drawing (Part 4) of the rice transplanter according to the first modification example of an embodiment of the present invention [Figure 10] (a) Explanatory drawing (Part 5) of the rice transplanter according to the first modification example of an embodiment of the present invention, (b) Explanatory drawing (Part 6) of the rice transplanter according to the first modification example of an embodiment of the present invention [Figure 11] Diagram (7) illustrating a first modified example of a rice transplanter according to the present invention. [Figure 12] Diagram (Part 1) illustrating a second modified example of a rice transplanter according to the embodiment of the present invention. [Figure 13] Diagram (Part Two) illustrating a second modified example of a rice transplanter according to the embodiment of the present invention. [Figure 14] Diagram (Part 3) illustrating a second modified example of a rice transplanter according to the embodiment of the present invention. [Figure 15] (a) Explanatory diagram of a second modified example of the embodiment of the present invention (part 4), (b) Explanatory diagram of a second modified example of the embodiment of the present invention (part 5) [Modes for carrying out the invention]

[0021] Embodiments of the present invention will be described in detail with reference to the drawings.

[0022] The same applies below, however, some components may not be shown in the drawings, or they may be shown in perspective or in an abbreviated form.

[0023] While describing the operation of the transmission 10 according to the embodiment of the present invention, a transmission operation control method related to the present invention, which is implemented by a controller or the like, will also be described.

[0024] The transmission 10 in the embodiment of the present invention is a specific example of the transmission in the present invention.

[0025] (1) First, the configuration and operation of the transmission 10 of the embodiment of the present invention will be specifically described with reference to Figures 1(a), 1(b), 2(a), 2(b), 3, 4(a), 4(b), 5(a), 5(b), 6, 7(a), and 7(b).

[0026] Here, Figure 1(a) is a left side view of the rice transplanter according to an embodiment of the present invention, Figure 1(b) is a top view of the rice transplanter according to an embodiment of the present invention, Figure 2(a) is a left side view of the transmission 10 of the rice transplanter according to an embodiment of the present invention, Figure 2(b) is a top view (part 1) of the transmission 10 of the rice transplanter according to an embodiment of the present invention, Figure 3 is a perspective view (part 1) of the pulley section 20 of the transmission 10 of the rice transplanter according to an embodiment of the present invention, and Figure 4(a) is a left side view of the pulley section 20 of the transmission 10 of the rice transplanter according to an embodiment of the present invention. Figure 4(b) is a perspective view (part two) of the pulley section 20 of the transmission 10 of the rice transplanter according to an embodiment of the present invention, Figure 5(a) is a plan view (part two) of the transmission 10 of the rice transplanter according to an embodiment of the present invention, Figure 5(b) is a perspective view (part one) of the transmission 10 of the rice transplanter according to an embodiment of the present invention, Figure 6 is a perspective view (part two) of the transmission 10 of the rice transplanter according to an embodiment of the present invention, Figure 7(a) is a partial bottom view of the rice transplanter according to an embodiment of the present invention, and Figure 7(b) is a partial perspective view of the rice transplanter according to an embodiment of the present invention.

[0027] The pulley section 20 is a pulley section that receives engine power transmitted from the engine pulley section. The gear shift section 30 is a gear shift section that changes the speed of the engine power received by the pulley section 20. The first cooling fan section 40 is a cooling fan section that cools the gear shift section 30. The first cooling fan section 40 is located between the pulley section 20 and the gear shift section 30. An outside air intake hole 20h is formed in the pulley section 20 so that outside air is drawn into the first cooling fan section 40.

[0028] The first cooling fan unit 40 for cooling the transmission unit 10, such as an HST, is located inside the pulley unit 20 rather than outside it. This not only keeps the distance from the first cooling fan unit 40 to the transmission unit 30, which is the HST body, small, but also prevents the fan airflow from the first cooling fan unit 40 from being reflected by the pulley unit 20, thus achieving a high cooling effect. Furthermore, since an outside air intake hole 20h is formed, cold air from the outside can circulate, and outside air intake caused by the pulley barrier is not easily obstructed.

[0029] The outside air intake hole 20h narrows in the direction from the pulley section 20 toward the gear shift section 30.

[0030] The outside air intake hole 20h is provided in the center of the pulley section 20 as a cast-out section. Since the outside air intake hole 20h is a hole whose cast-out slope narrows towards the speed change section 30, an increase in air velocity can be expected.

[0031] The first cooling fan section 40 is located inside the pulley section 20, but since an outside air intake hole 20h is formed, the effective area of ​​the pulley barrier is reduced, improving the cooling performance of the transmission 10, such as an HST.

[0032] The first cooling fan unit 40 is attached to the pulley unit 20 such that the rotating shaft member 21 of the pulley unit 20 also functions as the rotating shaft member of the first cooling fan unit 40. Multiple outside air intake holes 20h are formed in the pulley unit 20. The portion between adjacent outside air intake holes 20h is formed as a plate member 22. The plate member 22 is inclined so that outside air is drawn into the first cooling fan unit 40.

[0033] As the cooling performance of the transmission 10 is improved, the fan size of the first cooling fan section 40 can be reduced, so that the distance to the step floor 60 is secured by the smaller fan, and a layout with sufficiently large step spacing is realized.

[0034] Since rib-like plate members 22 are formed in the portion between the outside air intake holes 20h which are formed as casting holes, not only is the strength of the casting improved, but the intake air is less likely to escape to the outside. Because the plate members 22 are provided as fin-like blades, the pulley portion 20 can also function as a fan.

[0035] The second cooling fan unit 50 is also a cooling fan unit that cools the speed change unit 30. The pulley unit 20 is positioned between the first cooling fan unit 40 and the second cooling fan unit 50.

[0036] To further improve the cooling performance of the transmission 10, the second cooling fan section 50 is provided on the outside of the pulley section 20. The first cooling fan section 40 and the second cooling fan section 50, which are multiple cooling fan sections provided coaxially, are attached to the rotating shaft member 21 so as to sandwich the pulley section 20. The second cooling fan section 50, which is the outer cooling fan section, is fastened to the pulley section 20 by a fastening member 53, such as a tall nut, sometimes called a long nut, which is assembled to the pulley section 20. The outside air, which is mainly drawn in from the outside, is drawn in by the rotation of the second cooling fan section 50 and is sent to the first cooling fan section 40 at a high wind speed.

[0037] The second cooling fan section 50 has a plurality of blade members 51 and a central member 52 to which the plurality of blade members 51 are attached. The central member 52 is connected to the pulley section 20 at a predetermined distance. An outside air intake hole 52h is formed in the central member 52 so that outside air is drawn in. The outside air intake hole 52h at least partially overlaps the outside air intake hole 20h when viewed from the direction of the rotating shaft member 21.

[0038] The outside air intake hole 52h is formed in the central member 52 as a weight-reducing hole created by a weight-reducing process, and works in cooperation with the outside air intake hole 20h, which is a cast hole provided in the pulley section 20, which is the central pulley section between the first cooling fan section 40 and the second cooling fan section 50, thereby increasing the total volume of outside air supplied to the speed change section 30 via the first cooling fan section 40 and the second cooling fan section 50.

[0039] The pulley section 20, the gear shift section 30, the first cooling fan section 40, and the second cooling fan section 50 are aligned in the left-right direction of the vehicle body. Two parallel floor reinforcing rib members 61 are provided on the underside of the step floor 60 to reinforce the step floor 60. The longitudinal direction of the floor reinforcing rib members 61 is in the left-right direction of the vehicle body. The first cooling fan section 40 is positioned between adjacent floor reinforcing rib members 61 so that outside air is drawn into the first cooling fan section 40 in the left-right direction of the vehicle body.

[0040] The longitudinal direction of the floor reinforcing rib members 61, which constitute the rib pattern on the back of the floor step of the step floor 60 and are intended to increase the floor strength, does not strictly coincide with the left-right direction of the vehicle body. It may be inclined with respect to the left-right direction of the vehicle body, but it is preferable that it is not in the front-rear direction of the vehicle body. This is because the airflow direction indicated by arrow A is adjusted by the floor reinforcing rib members 61, so that the air smoothly drawn into the first cooling fan section 40 does not diffuse at all, and an increase in airflow velocity can be expected. At least the air outlet of the first cooling fan section 40, which is provided inside the pulley section 20, is positioned between two parallel floor reinforcing rib members 61, so the drawn air is not easily divided by the floor reinforcing rib members 61.

[0041] (2) Next, the configuration and operation of the transmission 10 of the embodiment of the present invention will be described in more detail, mainly with reference to Figures 8, 9(a), 9(b), 9(c), 10(a), 10(b), and 11.

[0042] Herein, Figures 8, 9(a), 9(b), 9(c), 10(a), 10(b), and 11 are explanatory diagrams (1 to 7) of a first modified example of an embodiment of the present invention.

[0043] The power extraction rotating shaft 110, which extracts power for car washing and other applications, is positioned to pass through, for example, a square tube 120 provided on the side of the vehicle frame for a side marker stay. The input end of the power extraction rotating shaft 110 engages with a spline shaft provided on the HST input side of the transmission unit 30, allowing such power to be easily extracted to the outside. Since the power extraction rotating shaft 110 passes through the inside of the square tube 120 and is not exposed, safety is ensured, and a dedicated shaft cover is not required, thus reducing the number of parts and simplifying the layout configuration for power extraction.

[0044] The reduction gear 200, which has a power output shaft 210 that outputs power for car washing, etc., is provided at the output end of the power take-out rotating shaft 110 via a bearing component 220 that receives the power take-out rotating shaft 110, and is supported by rigid components such as side marker components assembled to the side of the vehicle frame. The reduction gear 200 is positioned so as to be hidden below the step floor 60 and is not visible from above, so that it is almost impossible for the operator to unintentionally come into contact with the reduction gear 200.

[0045] A clutch mechanism 300 is provided on the reduction gear 200, allowing for easy power interruption in the reduction gear 200. The clutch mechanism 300 is switched on and off, for example, by the motor 320 pulling the cable of the arm 310. For this on / off operation, an on / off operation lever is provided above the step floor 60, and a drive switch for the motor 320 is provided on a monitor panel or the like.

[0046] To improve the safety of the power extraction described above, it is often desirable that the clutch mechanism 300 be turned off when the planting clutch of the seedling planting mechanism 600 is turned on. For example, when the planting clutch is turned on, the switch-on operation of the clutch mechanism 300 is disabled. In safety inspections, it may be considered dangerous if the seedling planting rod is driven while the clutch mechanism 300 is being used for purposes such as washing the car.

[0047] Conversely, it is often desirable that the planting clutch of the seedling planting mechanism 600 be turned off when the clutch mechanism 300 is on. For example, when the clutch mechanism 300 is being used for purposes such as car washing, the planting clutch switch-on operation is disabled. This further improves the safety of power extraction.

[0048] When the engine is off, the clutch mechanism 300 is also turned off, thereby reducing the load when the engine is started. For example, when the key is turned on to start the engine, control is performed to turn off the clutch mechanism 300.

[0049] (3) Next, the configuration and operation of the transmission 10 of the embodiment of the present invention will be described in more detail, mainly with reference to Figures 12, 13, 14, 15(a) and 15(b).

[0050] Herein, Figures 12, 13, 14, 15(a) and 15(b) are explanatory diagrams (one to five) of a second modified example of an embodiment of the present invention.

[0051] In addition to reducing the weight of the seedling planting mechanism 600, the cost of the soil leveling rotor mechanism 500 will be reduced due to the model change from a gantry-type soil leveling rotor unit 510 to a single-axis type soil leveling rotor unit 510.

[0052] This is because, by effectively utilizing existing components, a simple, single-axis type ground leveling rotor unit 510 can be constructed at a low cost.

[0053] Engine power is transmitted from the rear wheel drive shaft to the ground-leveling rotor drive shaft 540, and the ground-leveling rotor drive case 560 is installed so as to be eccentric toward the ground-leveling rotor drive shaft 540 with respect to the center in the left-right direction of the vehicle body.

[0054] The seedling planting drive shaft 650, which transmits engine power to drive the seedling planting rod, is located on the opposite side of the leveling rotor drive shaft 540 and the leveling rotor drive case 560, with respect to the center in the left-right direction of the vehicle body.

[0055] The tilling rotor blades 531 are not positioned in a location that overlaps with the seedling planting drive shaft 650 in a plan view. Therefore, the occurrence of clogging of the tilling rotor with debris such as floating objects in paddy fields is reduced, mud and water drainage is promoted, and the seedling planting drive shaft 650 is less likely to interfere with the tilling rotor 530.

[0056] The width of the center float section 711 in the left-right direction of the vehicle body is greater than the width of the center ground-leveling rotor section 520, which has multiple closely spaced ground-leveling rotors 530, in the left-right direction of the vehicle body. This is because the width of the center ground-leveling rotor section 520 in the left-right direction of the vehicle body does not become excessively large, thus ensuring that mud and water drainage is promoted in the single-axis type ground-leveling rotor unit 510.

[0057] A gantry-type ground leveling rotor unit 510 can be used as the ground leveling rotor drive case 560, but a housing 570 for supporting a rotating resin member 580 that transmits engine power to the center ground leveling rotor section 520 of a single-axis type ground leveling rotor unit 510 is connected to and held in the ground leveling rotor drive case 560.

[0058] More specifically, a rotating resin member stay 571 that supports the rotating resin member 580 is provided on the end face of the housing 570.

[0059] In addition to the oil seal, a housing debris-wrapping suppression device 572, which prevents debris from getting caught in the housing 570, is provided inside the rotating resin member stay 571.

[0060] As the seedling planting lifting link mechanism 660 rises, the rotation of the leveling rotor drive case 560 occurs, and the angle of bending of the joint shaft 550, which transmits engine power from the rear wheel drive shaft to the leveling rotor drive shaft 540, is mitigated and does not become very large, even when the seedling planting lifting link mechanism 660 is in its highest position.

[0061] The roller 592 is held to rotate in contact with the seedling planting lifting link mechanism 660, causing this rotation of the leveling rotor drive case 560 against the spring 591 acting as a return spring, and avoiding collisions between the leveling rotor unit 510 and the seedling planting lifting link mechanism 660, which are likely to occur as the link rises.

[0062] A plate 594 is provided that can not only reinforce the bent rod 593 while holding the roller 592, but can also support the lower end of the spring 591.

[0063] A housing cover 573, which has an inverted V-shape when viewed from the side, is attached to the top surface of the housing 570 as a roof-like cover that suppresses the accumulation of debris on the housing 570.

[0064] A sensing stay member 598 for float detection is provided in front of the center float section 711.

[0065] To ensure that the rotor lifting and lowering range of approximately 80 millimeters and the corresponding vertical plane are covered, not only is there a side rotor cover 596 located in front of the side float section 712, but there is also a center rotor cover 595 located in front of the center float section 711, which is attached to a center rotor cover stay 597 provided on the planting frame of the seedling planting lifting link mechanism 660.

[0066] Because the front end of the float of the center float section 711 protrudes forward of the vehicle body compared to the outer end of the rotor blades of the leveling rotor blades 531, which are located in front of the side float section 712, a sufficient center float area is secured.

[0067] The outermost diameter Dc of the center rotor blade 531 located in front of the center float section 711 is smaller than the outermost diameter Ds of the side rotor blade 531 located in front of the side float section 712.

[0068] Thus, even with the model change to the single-axis type ground leveling rotor unit 510, which realizes an integrated ground leveling rotor configuration, ground leveling performance is not sacrificed by ensuring sufficient center float area.

[0069] Furthermore, the program of the invention related to the present invention is a program that causes a computer to execute all or part of the steps (or processes, operations, and actions, etc.) of the transmission operation control method of the invention related to the present invention described above, and is a program that operates in cooperation with the computer.

[0070] Furthermore, the recording medium of the invention related to the present invention is a recording medium that records a program for causing a computer to execute all or part of the steps (or processes, operations, and actions, etc.) of the transmission operation control method of the invention related to the present invention described above, and is a computer-readable recording medium in which the read program is used in cooperation with the computer.

[0071] Furthermore, the "some steps (or processes, actions, and functions, etc.)" mentioned above refers to one or more of those steps.

[0072] Furthermore, the "actions of the steps (or processes, movements, and actions, etc.)" mentioned above refer to all or part of the actions of the steps mentioned above.

[0073] Furthermore, one form of use of the program of the invention related to the present invention may be that it is transmitted through a transmission medium such as the internet, light, radio waves, or sound waves, read by a computer, and operates in cooperation with the computer.

[0074] Furthermore, recording media include ROM (Read Only Memory), among others.

[0075] Furthermore, a computer is not limited to pure hardware such as a CPU (Central Processing Unit), but may also include firmware, an OS (Operating System), and even peripheral devices.

[0076] As mentioned above, the configuration of the present invention may be implemented in software or in hardware. [Industrial applicability]

[0077] The transmission device of the present invention can improve ease of use and is useful for applications such as transmission devices in rice transplanters. [Explanation of Symbols]

[0078] 10. Transmission 20 Pulley section 20h outside air intake vent 21 Rotating shaft member 22 Plate members 30 Gear shifting section 40 First cooling fan section 50 Second cooling fan section 51 Wing member 52 Central Member 52h outside air intake vent 53 Fastening members 60 Step Floor 61 Floor reinforcing rib member 110 Power extraction rotating shaft 120 square tube 200 Reducer 210 Power output shaft 220 Bearing Parts 300 Clutch mechanism 310 Arm 320 motor 500 Ground leveling rotor mechanism 510 Ground leveling rotor unit 520 Center leveling rotor section 530 Land leveling rotor 531 Land leveling rotor blades 540 Ground leveling rotor drive shaft 550 Joint shaft 560 Ground leveling rotor drive case 570 Housing 571 Rotating resin component stay 572 Housing debris trap with suppressor 573 Housing cover 580 Rotating Resin Member 591 Spring 592 Roller 593 Rod 594 Plate 595 Center Rotor Cover 596 Side Rotor Cover 597 Center rotor cover stay 598 Sensing stay member 600 Seedling planting mechanism 650 Seedling planting drive shaft 660 Seedling planting lifting link mechanism 711 Center float section 712 Side float section A Arrow DC Center Rotor Outermost Diameter of Rotating Blades Ds Side rotor outermost diameter of rotating blades

Claims

1. A pulley that receives engine power transmitted from the engine pulley, A gear shifting unit that shifts the engine power received by the pulley section, A first cooling fan unit for cooling the gear shifting unit, It is equipped with, The first cooling fan section is positioned between the pulley section and the gear shift section. A transmission characterized in that an outside air intake hole is formed in the pulley portion so that outside air is drawn into the first cooling fan portion.

2. The transmission according to claim 1, characterized in that the outside air intake hole narrows in the direction from the pulley portion toward the transmission portion.

3. The first cooling fan section is attached to the pulley section so that the rotating shaft member of the pulley section also functions as the rotating shaft member of the first cooling fan section. Multiple of the aforementioned outside air intake holes are formed in the pulley portion, The portion between adjacent outside air intake holes is formed as a plate member. The transmission according to claim 2, characterized in that the plate member is inclined so that the outside air is drawn into the first cooling fan section.

4. It further includes a second cooling fan unit for cooling the aforementioned gear shifting unit, The transmission according to claim 3, characterized in that the pulley portion is arranged between the first cooling fan portion and the second cooling fan portion.

5. The second cooling fan section has a plurality of blade members and a central member to which the plurality of blade members are attached, The central member is connected to the pulley portion at a predetermined distance, An outside air intake hole is formed in the central member so that the outside air can be taken in. The transmission according to claim 4, characterized in that the outside air intake hole at least partially overlaps the outside air intake hole when viewed from the direction of the rotating shaft member.

6. The pulley section, the gear shift section, the first cooling fan section, and the second cooling fan section are arranged in the left-right direction of the vehicle body. Two parallel floor reinforcing rib members are provided on the underside of the step floor to reinforce the step floor. The longitudinal direction of the floor reinforcing rib member is in the left-right direction of the vehicle body. The transmission according to claim 5, characterized in that the first cooling fan section is positioned between adjacent floor reinforcing rib members such that the direction in which the outside air is drawn into the first cooling fan section is in the left-right direction of the vehicle body.

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