JP2005350013A - Riding type working vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress rise of temperature near an engine and a continuously variable transmission in a riding type working vehicle provided with the engine and the continuously variable transmission at a front part of a vehicle body. <P>SOLUTION: In the riding type working vehicle, an output shaft 31c is projected to the lateral outside of right or left of the engine 31. The vehicle is constituted such that it is provided with a fan 35 at an opposite side to the output shaft 31c and cooling air is passed from the lateral outside of the engine to a neighborhood to the engine 31 and flows to the output shaft 31c side by the fan 35. The vehicle is constituted such that it is provided with the continuously variable transmission 32 at a rear side of the engine 31 and power of the engine 31 is transmitted to the continuously variable transmission 32 through a transmission belt 37. The vehicle is further constituted such that it is provided with a fan 36 on an input shaft of the continuously variable transmission 32 and cooling air flows from the continuously variable transmission to the lateral outside by the fan 36. In the vehicle, an exhaust pipe 53 is rearwardly extended from the output shaft 31c side beyond the continuously variable transmission 32 and a muffler 52 is provided in the exhaust pipe 53 at a rear part more than the continuously variable transmission 32. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a structure in the vicinity of an engine in a passenger work vehicle such as a passenger rice transplanter or a passenger direct seeder.

  In a passenger work vehicle, for example, as disclosed in Patent Document 1, an engine (23 in FIGS. 3, 4 and 6 of Patent Document 1) is provided at the front of the machine body, and an output shaft (FIG. 3 of Patent Document 1). , 4, 6 23 a) protrudes to the right or left laterally outward of the engine, and a fan (41 of FIGS. 3, 4, 6 of Patent Document 1) is placed on the left or right lateral side of the engine opposite to the output shaft. ), And the cooling fan is configured to flow from the lateral outer side of the engine through the vicinity of the engine to the output shaft side of the engine.

In Patent Document 1, a continuously variable transmission (24 in FIGS. 3, 4 and 5 of Patent Document 1) is provided on the rear side of the engine, and the power of the output shaft of the engine is input to the continuously variable transmission via a transmission belt. It is comprised so that it may be transmitted to a shaft (24a of Drawings 3, 4, and 5 of patent documents 1). A fan (48 in FIGS. 3, 4 and 5 of Patent Document 1) is provided on the input shaft of the continuously variable transmission, and the fan of the continuously variable transmission is configured to allow cooling air to flow laterally outward from the continuously variable transmission. ing.
As described above, in Patent Document 1, the flow of cooling air from the engine fan and the flow of cooling air from the continuously variable transmission fan are set in the same direction, and the heat generated by the engine and the continuously variable transmission are generated. Heat is properly discharged.

Japanese Patent Laid-Open No. 2001-199251 (FIGS. 3, 4, 5, and 6)

In Patent Document 1, an exhaust pipe is extended from the output shaft side of the engine, and a muffler (46 in FIGS. 3, 4 and 6 in Patent Document 1) is provided on the lateral outer side of the engine output shaft. Close to the engine. In this case, since the muffler generates a large amount of heat in the same manner as the engine and the continuously variable transmission, there is room for improvement in terms of suppressing an increase in temperature in the vicinity of the engine and the continuously variable transmission.
SUMMARY OF THE INVENTION An object of the present invention is to suppress an increase in the temperature in the vicinity of an engine and a continuously variable transmission in a passenger work vehicle having an engine and a continuously variable transmission at the front of the airframe.

[I]
(Constitution)
The first feature of the present invention resides in the following configuration in a passenger work vehicle.
The engine is installed at the front of the fuselage, the output shaft protrudes laterally to the right or left of the engine, and the fan is mounted on the left or right lateral side of the engine opposite to the output shaft. The cooling air is configured to flow from the lateral outer side of the engine through the vicinity of the engine and flow toward the engine output shaft. A continuously variable transmission is provided on the rear side of the engine, and the power of the output shaft of the engine is transmitted to the input shaft of the continuously variable transmission via a transmission belt. The fan is connected to the input shaft of the continuously variable transmission. The cooling air flows from the continuously variable transmission to the laterally outer side by the fan of the continuously variable transmission. An exhaust pipe of the engine is extended rearward from the output shaft side of the engine beyond the continuously variable transmission, and a muffler is provided in a rear portion of the exhaust pipe of the engine from the continuously variable transmission.

(Function)
According to the first feature of the present invention, when the engine is provided at the front portion of the fuselage and the continuously variable transmission is provided on the rear side of the engine, the exhaust pipe of the engine extends beyond the continuously variable transmission from the output shaft side of the engine. The muffler is provided in the rear part of the engine exhaust pipe behind the continuously variable transmission.
Thus, according to the first feature of the present invention, the muffler is moved backward from the vicinity of the engine and the continuously variable transmission, so that the heat generated by the muffler reaches the vicinity of the engine and the continuously variable transmission. The cooling air from the engine fan flows from the lateral side of the engine to the engine output shaft side from the outside of the engine to the output shaft side, and the cooling air from the continuously variable transmission fan flows from the continuously variable transmission to the lateral outside. The heat generated in the engine and the heat generated in the continuously variable transmission are appropriately discharged.

  When the heat generated by the muffler flows to the engine and the continuously variable transmission, the heat generated by the muffler may reach the continuously variable transmission and then reach the engine. In this case, according to the first feature of the present invention, the cooling air generated by the fan of the continuously variable transmission is flowing laterally outward from the continuously variable transmission, so when the heat generated by the muffler reaches the continuously variable transmission, Along with the flow of cooling air from the fan of the continuously variable transmission, the heat generated by the muffler flows laterally outward.

(The invention's effect)
According to the first feature of the present invention, in a passenger work vehicle equipped with an engine and a continuously variable transmission at the front of the fuselage, the heat generated by the muffler reaches the vicinity of the engine and the continuously variable transmission. Even if the heat generated by the muffler reaches the continuously variable transmission, the heat generated by the muffler flows to the outside along with the flow of cooling air from the fan of the continuously variable transmission. An increase in the temperature in the vicinity of the step transmission can be suppressed, and the performance of the engine and the performance of the continuously variable transmission in the passenger work vehicle can be improved.

[II]
(Constitution)
The second feature of the present invention resides in the following configuration in the riding type work vehicle of the first feature of the present invention.
A bonnet that covers the engine, a guide plate between the engine and the bonnet on the output shaft side of the engine, and a cooling that flows from the lateral outside of the engine to the engine output shaft side through the vicinity of the engine by the engine fan The wind is configured to be guided downward by the guide plate.

The third feature of the present invention resides in the following configuration in the riding type work vehicle of the first feature of the present invention.
A bonnet that covers the engine, a guide plate between the engine and the bonnet on the output shaft side of the engine, and cooling that flows from the lateral outside of the engine to the engine output shaft side through the vicinity of the engine by the engine fan The wind is configured to be guided downward and rearward along the exhaust pipe of the engine by the guide plate.

(Function)
According to the second feature (third feature) of the present invention, the “action” described in the preceding item [I] is provided in the same manner as the first feature of the present invention. In addition, the following “action” is provided. I have.
A passenger work vehicle is often provided with a bonnet that covers the engine. Thus, according to the second feature (third feature) of the present invention, when the cooling air from the engine fan flows from the lateral side of the engine to the engine output shaft side through the vicinity of the engine, the engine fan The cooling air is guided downward by the guide plate, so that it is difficult for the cooling air from the engine fan to directly hit the inner surface of the bonnet.

  According to the third feature of the present invention, when the cooling air from the engine fan passes from the lateral side of the engine to the engine output shaft side through the vicinity of the engine, the cooling air from the engine fan is lowered by the guide plate. In addition to being guided, the cooling air from the engine fan flows backward along the exhaust pipe of the engine by the guide plate, so that the cooling air from the engine fan suppresses the rise in the temperature of the engine exhaust pipe. It is done.

  According to the third aspect of the present invention, when the cooling air from the engine fan flows backward along the exhaust pipe of the engine as described above, the cooling air from the engine fan reaches the continuously variable transmission. Conceivable. Even in such a state, since the cooling air from the continuously variable transmission fan flows laterally outward from the continuously variable transmission, when the cooling air from the engine fan reaches the continuously variable transmission as described above, Along with the flow of cooling air from the continuously variable transmission fan, the cooling air from the engine fan flows laterally outward.

(The invention's effect)
According to the second feature (third feature) of the present invention, similarly to the first feature of the present invention, the “effect of the invention” described in the preceding item [I] is provided. The effect of the invention is provided.
According to the second feature (third feature) of the present invention, the cooling air from the engine fan is guided downward by the guide plate, so that the cooling air from the engine fan cannot easily hit the inner surface of the bonnet. The state where the bonnet is heated can be reduced.

According to the third aspect of the present invention, the cooling air from the engine fan is guided downward by the guide plate, and the cooling air from the engine fan flows backward along the exhaust pipe of the engine. The rise in the temperature of the pipe can be suppressed, and the deterioration of the durability of the exhaust pipe due to the rise in temperature can be prevented.
According to the third aspect of the present invention, even if the cooling air from the engine fan flows rearward along the exhaust pipe and reaches the continuously variable transmission, the engine continues to the cooling air flow from the continuously variable transmission fan. Since the cooling air from the fan flows laterally outward, the heat generated by the engine and the heat generated by the continuously variable transmission are appropriately discharged.

[III]
(Constitution)
According to a fourth aspect of the present invention, any one of the riding work vehicles according to the first to third aspects of the present invention is configured as follows.
A heat insulating member is disposed between the floor located above the muffler and the muffler.

(Function)
According to the 4th characteristic of this invention, it is equipped with the "action" of previous clause [I] [II] similarly to any one of the 1st-3rd characteristics of this invention, and also in addition to this. It has “action” like
As described in [I] above, the exhaust pipe of the engine is extended rearward from the output shaft side of the engine beyond the continuously variable transmission, and the muffler is placed in the exhaust pipe of the engine behind the continuously variable transmission. If equipped, the muffler may enter the state below the floor.
According to the fourth feature of the present invention, since the heat insulating member is disposed between the floor located above the muffler and the muffler, a state in which heat generated by the muffler reaches the floor is prevented, and the floor is A heated state is prevented.

(The invention's effect)
According to the fourth aspect of the present invention, the “effect of the invention” described in the preceding paragraphs [I] and [II] is provided in the same manner as any one of the first to third aspects of the present invention. The following “effects of the invention” are provided.
According to the fourth aspect of the present invention, by placing the heat insulating member between the floor located above the muffler and the muffler, it is possible to prevent the floor from being heated and to place the feet on the floor. It was possible to improve the comfort for the elderly.

[IV]
(Constitution)
A fifth feature of the present invention resides in the following configuration in any one of the riding work vehicles according to the first to fourth features of the present invention.
The muffler is supported on the fixed part of the fuselage via a vibration isolating member.

(Function)
According to the fifth aspect of the present invention, in addition to any one of the first to fourth characteristics of the present invention, the “action” described in the preceding paragraphs [I] to [III] is provided. It has the following “actions”.
As described in [I] above, the exhaust pipe of the engine is extended rearward from the output shaft side of the engine beyond the continuously variable transmission, and the muffler is placed in the exhaust pipe of the engine behind the continuously variable transmission. Since the exhaust pipe becomes relatively long, the vibration of the exhaust pipe and the muffler may be relatively large due to the vibration of the engine. According to the fifth feature of the present invention, since the muffler is supported on the fixed part of the airframe via the vibration isolating member, vibrations of the exhaust pipe of the engine and the muffler can be suppressed.

(The invention's effect)
According to the fifth feature of the present invention, the “effect of the invention” described in the preceding paragraphs [I] to [III] is provided as in any one of the first to fourth features of the present invention. In addition, the following “effects of the invention” are provided.
According to the fifth aspect of the present invention, the vibration of the exhaust pipe of the engine and the muffler can be suppressed by supporting the muffler on the fixed part of the fuselage via the vibration isolating member. The durability of the exhaust pipe and muffler of the engine could be improved by reducing the damage to the pipe and the muffler.

[V]
(Constitution)
A sixth feature of the present invention resides in the following configuration in any one of the riding work vehicles according to the first to fifth features of the present invention.
An input pulley around which the transmission belt is wound is externally fitted to the input shaft of the continuously variable transmission, and the fan of the continuously variable transmission is connected to the end of the input shaft of the continuously variable transmission. The fan of the step transmission and the input pulley are connected.

(Function)
According to the sixth aspect of the present invention, in addition to any one of the first to fifth aspects of the present invention, the “action” described in the preceding paragraphs [I] to [IV] is provided. It has the following “actions”.
When the input pulley around which the transmission belt is wound is externally fitted to the input shaft of the continuously variable transmission (for example, key structure or spline structure), the input pulley is prevented from coming off from the input shaft of the continuously variable transmission. A retaining structure is required.
According to the sixth aspect of the present invention, since the fan of the continuously variable transmission is connected across the input shaft and the input pulley of the continuously variable transmission, the input pulley can be prevented from coming off from the input shaft of the continuously variable transmission. This is prevented by the fan of the continuously variable transmission, and the fan of the continuously variable transmission rotates together with the input shaft and the input pulley of the continuously variable transmission.

(The invention's effect)
According to the sixth aspect of the present invention, as in any one of the first to fifth aspects of the present invention, the “effect of the invention” described in the preceding paragraphs [I] to [IV] is provided. In addition, the following “effects of the invention” are provided.
According to the sixth aspect of the present invention, when the input pulley around which the transmission belt is wound is externally fitted to the input shaft of the continuously variable transmission so as to be integrally rotatable, the input pulley is removed from the input shaft of the continuously variable transmission. Since the preventing structure for preventing the fan of the continuously variable transmission is also used, the structure can be simplified.

[1]
As shown in FIG. 1, a driving unit 3 is provided on a machine body supported by a front wheel 1 and a rear wheel 2, and a seedling planting device 6 is driven up and down via a link mechanism 4 and a hydraulic cylinder 5 at the rear part of the machine body. A riding type rice transplanter is supported freely.

  As shown in FIGS. 1 and 2, the seedling planting device 6 is configured in a four-row planting type, and can be driven to rotate to two transmission cases 21, right and left lateral sides of the rear portion of the transmission case 21. And a pair of planting arms 23 provided at both ends of the planting case 22, a grounding float 24, a seedling platform 25 on which seedlings are placed, and the like. Thus, as the seedling platform 25 is driven to reciprocate in the lateral direction of the machine body, the planting case 22 is rotationally driven, and the planting arms 23 alternately take out the seedlings from the lower part of the seedling platform 25. Plant on the surface.

  As shown in FIG. 1 and FIG. 2, a driving seat 8 is provided above the rear of the floor 7 in the driving unit 3, and a hopper 26 that stores fertilizer, a feeding unit 27, and a blower 28 on the rear side of the driving seat 8. Is provided. A groover 29 is provided in the ground float 24, and a hose 30 is connected across the feeding portion 27 and the groover 29. Thereby, along with the seedling planting as described above, the fertilizer is fed from the hopper 26 by a predetermined amount by the feeding unit 27, and the fertilizer is supplied to the grooving device 29 through the hose 30 by the blower 28. Therefore, fertilizer is supplied to the rice field through the grooving device 29.

  As shown in FIGS. 1, 2, and 3, a driver's seat 8 is provided on the upper rear side of the floor 7, and a bonnet 9 that covers an engine 31 described later is provided in front of the floor 7. The right and left steps 10 connected to the floor 7 are provided on the lateral side of the. The bonnet 9 includes an upper portion 9c fixed to a handle post 40 (see FIGS. 4 and 5), a rear portion 9b removably attached to the floor 7 and the upper portion 9c, and support pins 9d of the upper portion 9c (see FIG. 6). The front part 9a is provided with a front part 9a that can be opened and closed and detachable up and down.

  As shown in FIGS. 1, 2, and 3, a steering handle 11 that steers the front wheel 1 is provided on the upper portion 9 c of the bonnet 9. An accelerator lever 15 and an elevating lever 12 for operating the accelerator portion 31 are provided, and a main transmission lever 13 for operating a hydrostatic continuously variable transmission 32 to be described later is provided on the left side of the steering handle 11. Has been. A support frame 33 is provided on the laterally outer sides of the right and left steps 10, and a plurality of preliminary seedling platforms 39 are provided laterally outward on the support frame 33.

  As shown in FIGS. 1, 2, and 3, an operation arm 20 having a reverse U-shape when viewed from the front is supported around the horizontal axis P <b> 1 of the front frame 19 in the left-right direction of the machine body. A center mascot 46 is supported, and is configured to be swingable between a retracted position where the operation arm 20 stands upward and a work position protruding forward from the front of the machine body. When the operating arm 20 is operated to the working position that protrudes forward from the front of the machine body, the front wheel 1 and the steering handle 11 are held in the straight movement position, and the operating arm 20 is raised upward as shown in FIGS. When the storage position is operated, the holding of the front wheel 1 and the steering handle 11 is released.

  As shown in FIG. 13, a U-shaped bracket 20 a is fixed to the lower right portion of the operation arm 20, and the bracket 20 a of the operation arm 20 is around the horizontal axis P <b> 1 by a support pin 43 on the right side of the front frame 19. Is swingably supported. The lower left portion of the operation arm 20 is crushed into a flat plate shape to form a flat plate portion 20b. The flat plate portion 20b of the operation arm 20 can swing around the horizontal axis P1 by a bolt 44 on the left side of the front frame 19. It is tightened to. Thus, the operation arm 20 can be swung over the retracted position (see FIGS. 1, 2, and 3) that stands up and the work position that protrudes forward from the front of the machine body. In this case, a rubber washer 45 (a washer with rubber affixed to the inner periphery of the central opening) is attached to the support pin 43 and disposed between the bracket 20a of the operation arm 20 and the front frame 19. Thus, the backlash of the bracket 20a of the operation arm 20 is suppressed.

[2]
Next, the structure near the engine 31 and the hydrostatic continuously variable transmission 32 will be described.
As shown in FIGS. 4 and 5, a transmission case 16 is provided below the floor 7, and a hydrostatic continuously variable transmission 32 is fixed to the left side of the front portion of the transmission case 16. An air-cooled engine 31 is supported on the front frame 19 fixed to the case 16. As a result, the engine 31 is provided at the front portion of the fuselage, and the hydrostatic continuously variable transmission 32 is located behind the left side portion of the engine 31.

  As shown in FIGS. 4 and 5, the engine 31 is rearwardly inclined so that the crankcase 31b of the engine 31 is on the front side and the cylinder 31a of the engine 31 is on the rear side. Is supported by the transmission case 16, and the crankcase 31 b of the engine 31 is supported by the front frame 19.

  As shown in FIGS. 4, 5, and 11, the output shaft 31 c of the engine 31 protrudes left laterally outward from the crankcase 31 b of the engine 31, and an output pulley 31 d is fixed to the output shaft 31 c of the engine 31, A fan 35 is provided on the right side of the crankcase 31b of the engine 31. The input shaft 32a (see FIG. 16) of the hydrostatic continuously variable transmission 32 projects to the left laterally outward, and the input pulley 38 and the fan 36 are fixed to the input shaft 32a of the hydrostatic continuously variable transmission 32. A transmission belt 37 is wound around the output pulley 31 d of the engine 31 and the input pulley 38 of the hydrostatic continuously variable transmission 32.

  As shown in FIG. 4, a tension arm 47 is swingably supported around the horizontal axis of the front frame 19 in the horizontal direction of the machine body, and a tension pulley 47a is supported by the tension arm 47. The tension arm 47 is connected to the transmission belt. A spring (not shown) for biasing 37 is provided. Thus, when the tension arm 47 (tension pulley 47 a) is pressed against the transmission belt 37, the power of the engine 31 is transmitted to the hydrostatic continuously variable transmission 32, and the tension arm 47 (tension pulley 47 a) is separated from the transmission belt 37. Then, the power of the engine 31 is cut off.

  As shown in FIG. 16, the input pulley 38 is fitted on the input shaft 32 a of the hydrostatic continuously variable transmission 32, and the input shaft 32 a of the hydrostatic continuously variable transmission 32 and the boss portion 38 a of the input pulley 38 are connected. The key 41 is connected to be integrally rotatable. The fan 36 is connected to the end of the input shaft 32 a of the hydrostatic continuously variable transmission 32 by a bolt 42, and the boss 38 a of the input pulley 38 and the fan 36 are connected by the bolt 42.

  With the above structure, the power of the engine 31 is transmitted to the hydrostatic continuously variable transmission 32 via the transmission belt 37, and the power of the hydrostatic continuously variable transmission 32 is installed in the transmission case 16 ( The power of the auxiliary transmission is transmitted to the rear wheel 2 via right and left side clutches (not shown) housed in the transmission case 16. The hydrostatic continuously variable transmission 32 is configured to be steplessly variable to a neutral position, a forward high speed side, and a reverse high speed side, and the sub-transmission device is configured to be a gear transmission that can be shifted in two steps of high and low. Has been. The power branched from the hydrostatic continuously variable transmission 32 is transmitted to the seedling planting device 6 through a planting clutch (not shown) built in the transmission case 16, and the hydrostatic continuously variable transmission The power branched from 32 is transmitted to the feeding portion 27 (see FIG. 1) via a fertilizer clutch (not shown) built in the mission case 16.

  The state shown in FIGS. 1 and 2 is a state in which the main transmission lever 13 is operated to the neutral position, and the hydrostatic continuously variable transmission 32 is operated to the neutral position and the airframe is stopped. When the main shift lever 13 is operated from the neutral position to the forward forward shift range, the hydrostatic continuously variable transmission 32 is operated to the forward high speed side, and the main shift lever 13 is moved from the neutral position to the backward reverse shift range. When operated, the hydrostatic continuously variable transmission 32 is operated to the reverse high speed side.

  As shown in FIGS. 4 and 12, an arm-shaped support 16a is integrally extended on the left lateral surface of the mission case 16, and a support pin 49 is inserted into the hole of the support 16a of the mission case 16. The auxiliary transmission lever 50 for operating the auxiliary transmission is supported by the support pin 49 so as to be swingable, and a retaining pin 51 is attached to the end of the support pin 49. In this case, a rubber washer 45 (a washer with rubber adhered to the inner peripheral portion of the central opening) is attached to the support pin 49, and the auxiliary transmission lever 50 and the support portion 16a of the transmission case 16 are connected to each other. The auxiliary transmission lever 50 is prevented from being loose.

  As shown in FIGS. 2 and 3, the operation pedal 14 is provided in the portion near the floor 7 of the right step 10, and when the operation pedal 14 is operated to the lower step position, the hydrostatic continuously variable transmission 32. Is operated to a low speed position slightly higher than the neutral position, the tension arm 47 (tension pulley 47a) (see FIG. 4) is separated from the transmission belt 37 (power of the engine 31 is cut off), and the front wheels 1 and A brake (not shown) capable of braking the rear wheel 2 is operated to the braking side. When the operation pedal 14 is operated to the upper return position, the tension arm 47 (tension pulley 47a) (see FIG. 4) is applied to the transmission belt 37 while the hydrostatic continuously variable transmission 32 is left at the low speed position. When pressed (the power of the engine 31 is transmitted to the hydrostatic continuously variable transmission 32), the brake is operated to the brake release side, and the operating pedal 14 is moved upward by a spring (not shown). Is being energized.

  As shown in FIGS. 2 and 3, the operation lever 17 is fixed to the operation pedal 14, and the operation lever 17 is extended forward. The operation lever 14 is moved downward by the operation lever 17 from the front side of the machine body. And can be operated to the upper return position. A lock lever 18 is provided in the right step 10, and the operation lever 17 and the operation pedal 14 can be held at the lower step position by the lock lever 18.

[3]
Next, the structure near the muffler 52 will be described.
As shown in FIGS. 4 and 11, the exhaust pipe 53 of the engine 31 extends from the left lateral side of the cylinder 31 a of the engine 31, and the exhaust pipe 53 of the engine 31 extends obliquely downward above the transmission belt 37. The exhaust pipe 53 of the engine 31 extends rearward from the vicinity of the hydrostatic continuously variable transmission 32 and extends to the lower left side of the floor 7. A muffler 52 is provided in the exhaust pipe 53 of the engine 31 at a portion rearward of the hydrostatic continuously variable transmission 32 along the longitudinal direction of the fuselage.

  As shown in FIGS. 11, 14, and 15, a support frame 54 (corresponding to a fixed portion) is fixed to the upper portion of the mission case 16, and the support frame 54 is disposed along the left and right directions of the machine body. 7 is supported. A band-like plate material 56 is wound around and fixed to the muffler 52 so that an anti-vibration rubber 55 (corresponding to an anti-vibration member) is sandwiched between the end of the plate 56 and the left end of the support frame 54. Thus, the end of the plate member 56 is fixed to the left end of the support frame 54 by the bolt 61. As a result, the muffler 52 is supported by the support frame 54 in a cantilever manner by the plate material 65, and the muffler 52 and the plate material 56 are supported by the support frame 54 via the vibration isolating rubber 55. A flat heat insulating plate 58 (corresponding to a heat insulating member) is disposed between the floor 7 and the muffler 52, and a heat insulating sheet 59 (corresponding to a heat insulating member) is attached to the lower surface of the heat insulating plate 58.

  As shown in FIGS. 4 and 11, a guide plate 60 that covers the upper part of the cylinder 31 a of the engine 31 and the exhaust pipe 53 of the engine 31 is provided. In a side view (see FIG. 4), the lower end of the guide plate 60 extends to the vicinity of the transmission belt 37, and the rear end of the guide plate 60 extends to the upper side of the hydrostatic continuously variable transmission 32. .

  With the above structure, as shown in FIGS. 4 and 11, the muffler 52 is separated rearward from the vicinity of the engine 31 and the hydrostatic continuously variable transmission 32, and the heat generated in the muffler 52 is generated by the engine 31 and the hydrostatic pressure. It is difficult to reach a state where the vicinity of the continuously variable transmission 32 is reached. A state in which heat generated in the muffler 52 reaches the floor 7 is prevented by the heat insulating plate 58 and the heat insulating sheet 59 (see FIGS. 14 and 15). When the heat generated in the muffler 52 flows to the engine 31 and the hydrostatic continuously variable transmission 32, when the heat generated in the muffler 52 reaches the hydrostatic continuously variable transmission 32, the hydrostatic continuously variable transmission. The heat generated by the muffler 52 flows to the left lateral outside together with the flow of cooling air by the 32 fans 36.

  As shown in FIGS. 4 and 11, the cooling air from the fan 35 of the engine 31 flows from the right lateral outer side of the engine 31 to the vicinity of the engine 31 (cylinder 31 a) and flows toward the output shaft 31 c of the engine 31. Therefore, the cooling air from the fan 35 of the engine 31 is less likely to directly hit the inner surface of the bonnet 9 (front 9a and rear 9b) (see FIG. 6). Cooling air from the fan 36 of the hydrostatic continuously variable transmission 32 flows from the hydrostatic continuously variable transmission 32 to the left lateral outside. The heat generated by the engine 31 and the hydrostatic continuously variable transmission 31 The generated heat is properly discharged.

As shown in FIGS. 4 and 11, the cooling air from the fan 35 of the engine 31 flows from the right lateral outer side of the engine 31 to the vicinity of the engine 31 (cylinder 31 a) and flows toward the output shaft 31 c of the engine 31. In this case, the cooling air from the fan 35 of the engine 31 is guided downward by the guide plate 60, and the cooling air from the fan 35 of the engine 31 flows along the exhaust pipe 53 of the engine 31 by the guide plate 60. Thus, the rise in the temperature of the exhaust pipe 53 of the engine 31 is suppressed by the cooling air from the fan 35 of the engine 31.
As described above, when the cooling air from the fan 35 of the engine 31 flows along the exhaust pipe 53 of the engine 31 by the guide plate 60 and reaches the hydrostatic continuously variable transmission 32, the hydrostatic continuously variable Along with the flow of cooling air by the fan 36 of the transmission 32, the cooling air by the fan 35 of the engine 31 flows to the left lateral outside.

[4]
Next, the lifting lever 12 will be described.
As shown in FIGS. 4, 6, and 11, the power steering mechanism 57 is fixed to the upper portion of the front portion of the transmission case 16, and the handle post 40 configured by bending a plate material into a box shape is fixed to the power steering mechanism 57. The steering handle 11 is supported on the upper portion of the handle post 40. As shown in FIGS. 5 and 9, a support shaft 64 facing in the left-right direction of the machine body is fixed through the handle post 40, and a cylindrical shaft 65 is externally fitted around the support shaft 64 so as to be relatively rotatable. A support bracket 66 configured to be bent in a U shape is fixed to the cylindrical shaft 65. The elevating lever 12 is swingably supported around the axis P3 of the support bracket 66.

  As shown in FIGS. 5 and 9, the elevating lever 12 can be operated in the ascending position, the neutral position, the descending position, and the planting position along the longitudinal direction of the machine body, and the engagement plate 62 is fixed to the cylindrical shaft 65. A damper member 63 is connected across the engagement plate 62 and the handle post 40, and the lift lever 12 is urged to the raised position (counterclockwise in FIG. 5) by the damper member 63. An operation arm 67 is supported on the handle post 40 so as to be swingable up and down, and the operation arm 67 is biased upward by a spring (not shown), and a roller 67 a at the tip of the operation arm 67 is connected to the engagement plate 62. By entering the individual recesses 62a, the elevating lever 12 is held at the neutral position, the lowered position and the planting position against the urging force of the damper member 63.

  As shown in FIGS. 1 and 2, right and left markers 68 are provided on the right and left lateral sides of the seedling planting device 6 to form an indicator of the next planting process on the rice field. The left marker 68 is configured to be freely operated to a working posture (see FIG. 1) that enters the field and a retracted posture (see FIG. 2) that is lifted upward from the field. When the seedling planting device 6 is driven to rise greatly from the rice field, the right and left markers 68 are operated to the retracted posture, and the right and left lock mechanisms (not shown) cause the right and left markers 68 to be retracted. Even if the seedling planting device 6 is driven downward to the paddy field, the right and left markers 68 are held in the retracted position by the right and left locking mechanisms.

  As shown in FIGS. 9 and 10 (a), the operation shaft 70 is fixed to the operation plate 69, and the operation shaft 70 is swingably supported around the axis P4 of the support bracket 66. Is connected to the operation plate 69 by a pin so as to be swingable, and the wire 71 is connected across the right and left lock mechanisms and the connection member 72. The operation pin 12 a is fixed to the elevating lever 12, and the operation pin 12 a of the elevating lever 12 is engaged with the operation plate 69. An elongated linear spring material is bent to form a return spring 73, and the return spring 73 is attached across the base of the lift lever 12, the operation shaft 70, and the operation pin 12 a of the lift lever 12. As a result, as shown in FIG. 10A, the elevating lever 12 is urged to the center position around the axis P3 by the return spring 73.

  As shown in FIGS. 5 and 9, when the elevating lever 12 is operated to the raised position, a planting clutch (not shown) that transmits power to the seedling planting device 6 is operated in a disconnected state, and the hydraulic cylinder 5 The seedling planting device 6 is driven up. When the elevating lever 12 is operated to the neutral position, the planting clutch is operated in the disengaged state and the hydraulic cylinder 5 is stopped. When the elevating lever 12 is operated to the lowered position, the planting clutch is operated in a disengaged state, and the seedling planting device 6 is driven downward by the hydraulic cylinder 5. When the elevating lever 12 is operated to the planting position, the planting clutch is operated in the transmission state, and the seedling planting device 6 is automatically driven up and down by the hydraulic cylinder 5 so as to be maintained at the set height from the rice field. . As shown in FIG. 10 (b), the lifting lever 12 is moved to the right or left against the urging force of the return spring 73 at the planting position (by opening the return spring 73 by the operation pin 12a of the lifting lever 12). , The right or left lock mechanism is released via the wire 71 and the right or left marker 68 is operated to the working posture.

  When the elevating lever 12 is operated to the neutral position, the lowered position, and the planting position, if the main transmission lever 13 is operated from the neutral position to the backward reverse shift range (the hydrostatic continuously variable transmission 32 is operated at a high speed for reverse). 9), the operation arm 67 shown in FIG. 9 is forcibly operated downward, and the roller 67a of the operation arm 67 is separated downward from the recess 62a of the engagement plate 62. Therefore, the biasing force of the damper member 63 As a result, the elevating lever 12 is operated to the raised position (the planting clutch is operated in the disengaged state, and the seedling planting device 6 is driven up by the hydraulic cylinder 5).

[5]
Next, the fuel tank 74 will be described.
As shown in FIGS. 7 and 8, the fuel tank 74 is integrally formed of a synthetic resin, and first and second support rods 75 and 76 are attached to the lower part of the fuel tank 74 in the front-rear direction. A U-shaped (channel-shaped) first support member 77 and a U-shaped (channel-shaped) second support member 78 that is shorter than the first support member 77 are disposed on the right and left lateral sides of the handle post 40. It is fixed. By inserting the first and second support rods 75 and 76 into the first and second support members 77 and 78, the fuel tank 74 is supported by the first and second support members 77 and 78. 74 is movably supported along the first and second support members 77 and 78.

  The state shown by the solid lines in FIGS. 4, 5, and 7 is a state in which the fuel tank 74 is moved rearward along the first and second support members 77 and 78 and is positioned at a predetermined position. The front ends of the support rods 75 and 76 protrude slightly rearward from the rear ends of the first and second support members 77 and 78, and a pin 79 is attached to the front ends of the first and second support rods 75 and 76. The tank 74 is held at a predetermined position. In a state where the fuel tank 74 is held at a predetermined position, the fuel tank 74 is positioned above the cylinder 31a of the engine 31, and the front portion 9a of the bonnet 9 is operated to the closed position, and the front of the bonnet 9 is From the part between the part 9a and the upper part 9c, the fuel supply port 74a of the fuel tank 74 and the lid member 80 attached to the fuel supply port 74a protrude upward.

  As shown in FIG. 6, the front portion 9a of the bonnet 9 is opened (as shown by the two-dot chain line in FIG. 6), the front portion 9a of the bonnet 9 is connected to the receiving portion 46a of the center mascot 46. 9a, the front portion 9a of the bonnet 9 can be held in an opened state), or the front portion 9a of the bonnet 9 is removed (the rear portion 9b of the bonnet 9 is removed). By removing the pin 79 of the first support rod 75, the fuel tank 74 is moved to the front non-predetermined position along the first and second support members 77 and 78 as shown by the two-dot chain line in FIGS. Can be made. By moving the fuel tank 74 to a non-predetermined position, the upper part of the cylinder 31a of the engine 31 is opened, so that the plug (not shown) of the cylinder 31a of the engine 31 can be easily replaced.

  6 and 7, when the fuel tank 74 is moved to a non-predetermined position, the pin 79 of the second support rod 76 hits the rear end of the second support member 78, and the fuel tank 74 is not moved. It cannot be moved from a predetermined position forward (to the left in FIG. 6). In this case, if the pin 79 of the second support rod 76 is removed, the first and second support rods 75 and 76 can be completely pulled out from the first and second support members 77 and 78, thereby the fuel tank. It is also possible to move 74 from a non-predetermined position to another position.

[Another Embodiment of the Invention]
In the above-mentioned [Best Mode for Carrying Out the Invention], the output shaft 31c of the engine 31 protrudes from the crankcase 31b of the engine 31 to the right laterally outward, and the left lateral side portion of the crankcase 31b of the engine 31 is left. The fan 35 may be provided, and the hydrostatic continuously variable transmission 32 may be fixed to the right side portion of the mission case 16. Instead of the hydrostatic continuously variable transmission 32, a gear-type forward / reverse switching device (not shown) and a belt-type continuously variable transmission (not shown) are separately provided. The continuously variable transmission may be configured to be operated by the main transmission lever 13. Instead of the air-cooled engine 31, a water-cooled or liquid-cooled engine 31 equipped with a radiator (not shown) may be used. Instead of the right and left front wheels 1 and the right and left rear wheels 2, a right and left crawler type traveling device (not shown) may be provided.
The present invention is applicable not only to a riding type rice transplanter, but also to a riding type direct seeding machine that supports a direct sowing device at the rear part of the machine body so as to be movable up and down, and a riding type work machine that supports a rotary rotary at the rear part of the machine body so as to be movable up and down. it can.

Overall side view of riding rice transplanter Overall plan view of riding rice transplanter Overall front view of riding rice transplanter Left side view of the vicinity of the engine, transmission case, hydrostatic continuously variable transmission Right side view near the engine and transmission case Left side view near the engine, fuel tank, and bonnet Left side view near the fuel tank Top view near the fuel tank Right side view near the base of the lift lever Longitudinal front view near the base of the lift lever Plan view of the vicinity of the engine, transmission case, hydrostatic continuously variable transmission Left side view near the base of the sub-shift lever Longitudinal front view near the base of the operating arm Left side view near the muffler Longitudinal front view near the muffler Transverse plan view near the input shaft and fan of the hydrostatic continuously variable transmission

Explanation of symbols

7 floor 9 bonnet 31 engine 31c engine output shaft 32 continuously variable transmission 32a continuously variable transmission input shaft 35 engine fan 36 continuously variable transmission fan 37 transmission belt 38 input pulley 52 muffler 53 engine exhaust pipe 54 machine body Fixed portion 55 Anti-vibration member 58, 59 Thermal insulation member 60 Guide plate

Claims (6)

The engine is provided at the front part of the fuselage, the output shaft projects to the right or left laterally outward of the engine, and the engine is provided with a fan on the left or right lateral side of the engine opposite to the output shaft. The cooling air is configured so that the cooling air flows from the lateral outside of the engine to the engine output shaft side through the vicinity of the engine,
A continuously variable transmission is provided on the rear side of the engine, and the power of the output shaft of the engine is transmitted to the input shaft of the continuously variable transmission via a transmission belt. A shaft is provided with a fan, and the cooling air is configured to flow laterally outward from the continuously variable transmission by the fan of the continuously variable transmission.
A passenger-type work vehicle in which an exhaust pipe of the engine is extended rearward from the output shaft side of the engine beyond the continuously variable transmission, and a muffler is provided in a rear portion of the exhaust pipe of the engine from the continuously variable transmission. A bonnet that covers the engine, a guide plate between the engine and the bonnet on the output shaft side of the engine,
The riding according to claim 1, wherein the cooling air flowing through the vicinity of the engine from the lateral outer side of the engine to the output shaft side of the engine by the fan of the engine is guided downward by the guide plate. Type work vehicle. A bonnet that covers the engine, a guide plate between the engine and the bonnet on the output shaft side of the engine,
Cooling air that flows from the lateral outer side of the engine to the output shaft side of the engine by the engine fan is guided downward and rearward along the exhaust pipe of the engine by the guide plate. The riding type work vehicle according to claim 1.   The riding type work vehicle according to any one of claims 1 to 3, wherein a heat insulating member is disposed between a floor located above the muffler and the muffler.   The riding work vehicle according to any one of claims 1 to 4, wherein the muffler is supported on a fixed portion of the fuselage via a vibration isolation member.   An input pulley around which the transmission belt is wound is externally fitted to the input shaft of the continuously variable transmission, and the fan of the continuously variable transmission is connected to the end of the input shaft of the continuously variable transmission, The riding type work vehicle according to any one of claims 1 to 5, wherein a fan of the continuously variable transmission and an input pulley are connected.

Images