JP4575823B2 - Paddy field work vehicle - Google Patents

Description

  The present invention relates to a paddy field work vehicle such as a riding rice planter provided with a mission case and an HST device (hydrostatic transmission) at the rear of an engine.

  A mission case is placed behind the engine mounted on the front of the fuselage, the left and right front axle cases are connected to the rear lower side of the mission case, and the axle case on one side of the front of the mission case is positioned substantially in parallel. 2. Description of the Related Art A paddy work vehicle is known that has a configuration in which an HST device is mounted, ensures a sufficient cutting angle of a front wheel when the aircraft turns slightly, and can maintain a good overall weight balance (for example, Patent Document 1). reference).

Japanese Patent Laying-Open No. 2003-306174 (page 2-3, FIG. 3)

  In the paddy field machine, since the transmission case is arranged behind the engine and the HST device is arranged on one side of the transmission case, the length of the drive system composed of the engine, the HST device and the transmission case is long. It becomes longer and the length of the aircraft becomes longer. In order to shorten the length of the aircraft, for example, if the engine and the HST device are stacked in the vertical direction, the length of the belt that links the engine and the HST device is shortened, and the tension of the belt becomes insufficient. This will reduce the reliability of the tension clutch function.

  In view of the above circumstances, the present invention can reduce the length of the drive system in a compact manner, and can secure the length of the belt that links the engine and the HST device to improve the reliability of the tension clutch function. The purpose is to provide a work vehicle.

To achieve the above object, the present invention according to claim 1, the power from the aircraft (15) engine disposed in the front (31), belts transmission (43), HST device (40) and a transmission In the paddy field work vehicle that travels by transmitting to the front wheels (12) supported by the left and right front axle cases (35) via
The engine (31) and the transmission case (32) housing the transmission are arranged so that the transmission case is positioned behind the engine body and partially overlapped in plan view,
On the left and right of the rear part of the transmission case (32), the front axle case (35) is inclined so that the upper part is behind the lower part , and on one side of the central part of the transmission case, The HST device (40) is inclined and arranged so that the upper part is behind the lower part and along the front axle case (35) ,
The belt transmission (43) includes an output pulley (45) fixed to the output shaft of the engine (31), and an input pulley (46) fixed to the input shaft (41) of the HST device (40). A belt (47) stretched between the output pulley (45) and the input pulley (46), and a tension pulley (48) constituting a tension clutch that loosens and loosens the belt and intermittently transmits power. With
Paddy field work vehicle characterized by that.

According to a second aspect of the present invention, an oil pump drive pulley (53) is disposed in front of the HST device (40) on one side of the transmission case (32) and above the lower surface of the HST device (40). And
An upper portion of the transmission case ( 53 ) where the oil pump drive pulley (53) is arranged in the transmission case (32) is cut out, and the engine (31) is superposed by the cutout portion (33). Power is transmitted to the pump driving pulley (53) via the belt (55).
It exists in the paddy field work vehicle of Claim 1.

  The reference numerals in the parentheses are for reference to the drawings and do not limit the present invention.

  According to the first aspect of the present invention, the transmission case is partially overlapped in plan view behind the engine, and the front axle case is disposed at the rear of the transmission case, so that the drive system can be accommodated in a compact size in the length direction. In addition, the HST device is arranged on one side of the central part of the transmission case and the front part having the input shaft is inclined so as to be located rearward while ensuring the steering operation space below it. Therefore, it is possible to secure the length of the belt that links the engine and the HST device, to sufficiently tighten the belt tension, and to improve the reliability of the tension clutch function.

  According to the second aspect of the present invention, on the basis of the rear inclined arrangement of the HST device, the transmission pulley for the oil pump is arranged by using the space that is formed in front of the HST device and becomes wider toward the upper side. The lower surface of the front part can be set relatively upward, the steering operation space such as the pitman arm can be secured above the conventional level, and an oil pump is arranged in the front part of the transmission case, and the oil pump The power from the engine is transmitted to the drive pulley by a belt, and the engine is arranged by superimposing it on the notch of the transmission case above it to reduce the vertical thickness of the engine and the transmission case in the front part of the aircraft Together, these can make the front part of the paddy field work vehicle short in the front-rear direction, It is possible to ensure clearance of the lower.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 to 6 show an embodiment of the present invention. FIG. 1 is a side view of a paddy field work vehicle, FIG. 2 is a plan view of a traveling machine body of the paddy field work vehicle, and FIG. 3 is an arrangement of a drive system. FIG. 4 is a plan view showing the arrangement of the drive system, FIG. 5 shows the fuselage cover, (a) is a side view, (b) is a plan view, and (c) is a rear view, 6A and 6B show the arrangement of the inter-stock shift lever, where FIG. 6A is a side view and FIG. 6B is a rear view.

  As shown in FIGS. 1 and 2, the paddy field vehicle 1 includes a traveling machine body 11 and a working machine 21 connected to a rear portion of the traveling machine body 11 via a lifting link mechanism 20. The traveling machine body 11 includes a machine body 15 having a front wheel 12 and a rear wheel 13. An engine (not shown) covered with a bonnet 16 is mounted on the front portion of the machine body 15, and a seat seat is provided behind the engine body. A driver's seat having 17 is arranged and a steering wheel 18 is provided.

The working machine 21 includes a seedling base 22, a planter case 23, a planting device 25, a planting claw 26, a float 27, and the like, and the planting device 25 rotates as the traveling machine body 11 travels, and the planting The seedling of the unit stock obtained by scraping off the seedling from the seedling table 22 with the nail 26 is planted on the rice field.

  As shown in FIGS. 3 and 4, an engine 31 having an output shaft 30 disposed in the horizontal direction is mounted on the front portion of the machine body 15. The transmission case 32 that houses the transmission has a notch 33 formed in the upper front portion, and the notch 33 is disposed below the engine 31. That is, the mission case 32 is disposed on the body 15 so that the front portion thereof overlaps with the engine 31 in a plan view.

  A pair of left and right front axle cases 35 for supporting the front wheels 12 are connected to the rear portion of the transmission case 32. The front axle case 35 has a fixed final case 36 fixed to the transmission case 32 and a movable final case 37 rotatably supported by the fixed final case 36, and is rotatable on the movable final case 37. The front wheel 12 is fixedly supported on the supported support shaft 38. The front axle case 35 is disposed in an inclined state so that the movable final case 37 is positioned in front of the fixed final case 36.

  On one side surface of the central part of the transmission case 32, an HST device 40 is mounted substantially parallel to the front axle case 35 so that the input shaft 41 is upward and the output shaft 42 is downward. That is, the HST device 40 is arranged so that the upper part is behind the lower part. An output shaft 42 of the HST device 40 is connected to an input shaft (not shown) of a transmission housed in the mission case 32.

  The output shaft 30 of the engine 31 and the input shaft 41 of the HST device 40 are interlocked and connected via a belt transmission device 43. The belt transmission device 43 includes an output pulley 45 fixed to the output shaft of the engine 31, an input pulley 46 fixed to the input shaft 41 of the HST device 40, and between the output pulley 45 and the input pulley 46. And a tension pulley 48 that constitutes a tension clutch that tightens and loosens the belt 47 and interrupts transmission of power.

  The oil pump 50 is supported by the airframe 15 so as to be positioned below the notch 33 of the mission case 32. That is, the oil pump 50 is disposed so as to be positioned below the overlapping portion in a plan view of the engine 31 and the transmission case 32, and an input shaft 51 of the HST device 40 is arranged by a rear inclined arrangement of the HST device 40. It is arranged so as to be positioned in front of the input shaft 41 using a space formed forward and wider as it goes upward.

  The output shaft 30 of the engine 31 and the input shaft 51 of the oil pump 50 are linked and connected via a belt transmission device 52. The belt transmission 52 includes an output pulley 45 fixed to the output shaft of the engine 31, an oil pump drive pulley 53 fixed to the input shaft 51 of the oil pump 50, the output pulley 45 and the oil pump. A belt 55 spanned between the drive pulley 53 and a tension pulley 56 constituting a tension clutch that tightens and loosens the belt 55 and intermittently transmits power.

  A steering shaft 58 is erected on the upper surface of the transmission case 32 via a hydraulic steering unit 57, and the steering wheel 18 is fixed to the steering shaft 58. The steering unit 57 operates using hydraulic oil supplied from the oil pump 50 as hydraulic oil, and the transmission case 32 also serves as a hydraulic oil tank.

  A pitman arm 61 is fixed to the output shaft 60 of the steering unit 57, and the pitman arm 61 and the movable final case 37 of the front axle case 35 are connected by a drag link (not shown). The movement of the pitman arm 61 that is turned by the rotation of the output shaft 60 via the drag link is transmitted to the movable final case 37, and the steering operation of the front wheel 12 is performed.

  As shown in FIG. 5, the airframe cover 65 is formed with a bulging portion 66 that covers an upper portion of the HST device 40 and a floor portion 67 on which an operator gets on.

  As shown in FIG. 6, an inter-member transmission (not shown) housed in the transmission case 32 is connected to an interlocking member (not shown) extending from above the front axle case 35 toward the front of the HST device 40. An inter-stock shift lever 71 operated via a not-shown) is disposed so as to penetrate the bulging portion 66 of the body cover 65 from above the HST device 40 and protrude in the vicinity of the steering wheel 18. .

  As described above, the mission case 32 is arranged behind the engine 31 so as to partially overlap in plan view, and the front axle case 35 is arranged at the rear of the mission case 32. A drive system composed of a housed transmission, etc. can be accommodated in the compact direction in the length direction, and the machine body 15 with a short front part can be constructed. Rotation can be enabled.

  Further, since the oil pump 50 can be disposed at a relatively high position below the mission case 32, an operation space for disposing a steering member such as the pitman arm 61 can be secured below the oil pump 50.

  Further, since the HST device 40 is disposed on one side surface of the central portion of the mission case 32 so that the input shaft 41 is located behind the output shaft 42, the belt transmission device that links the engine 31 and the HST device 40 with each other. The length of the belt 47 of the belt 43 is ensured, and the belt 47 is sufficiently tightened and loosened by the tension pulley 48, so that the reliability of the tension clutch function can be improved.

  In addition, the oil pump 50 is disposed so as to be positioned below the overlapped portion in a plan view of the engine 31 and the transmission case 32, and the input shaft 51 is formed in front of the HST device 40 by the rear inclined arrangement of the HST device 40. In addition, since the space which becomes wider as it goes upward is arranged so as to be positioned in front of the input shaft 41, the lower surface of the front portion of the mission case 32 can be set relatively upward.

It is a side view of a paddy field work vehicle. It is a top view of the traveling body of a paddy field work vehicle. It is a side view which shows arrangement | positioning of a drive system. It is a top view which shows arrangement | positioning of a drive system. The body cover is shown, (a) is a side view, (b) is a plan view, and (c) is a rear view. The arrangement | positioning of an inter-stock transmission lever is shown, (a) is a side view, (b) is a rear view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Paddy field vehicle 12 Front wheel 15 Machine body 31 Engine 32 Mission case 33 Notch part 35 Front axle case 40 HST apparatus 47 Belt 48 Tension clutch (tension pulley)
50 Oil pump 53 Oil pump drive pulley 55 Belt

Claims (2)

Power from the engine arranged on the body front, belts transmission, in paddy fields work vehicle traveling is transmitted to front wheels supported on the left and right of the front axle case through the HST device and transmission,
The engine and a transmission case housing the transmission are arranged so that the transmission case is located behind the engine body and partially overlaps in plan view,
The front axle case is inclined and arranged on the left and right of the rear part of the mission case so that the upper part is rearward compared to the lower part , and the upper part is compared with the lower part on one side of the central part of the mission case. And the HST device is inclined and arranged so as to be rearward and along the front axle case ,
The belt transmission device includes an output pulley fixed to the output shaft of the engine, an input pulley fixed to the input shaft of the HST device, and a belt stretched between the output pulley and the input pulley. A tension pulley that constitutes a tension clutch that tightens and loosens the belt and interrupts transmission of power;
Paddy field work vehicle characterized by that. An oil pump drive pulley is disposed in front of the HST device on one side of the transmission case and above the lower surface of the HST device,
The upper part of the transmission pulley for the oil pump of the transmission case is cut out, the engine is arranged by the cutout part, and the power is transmitted from the engine to the oil pump drive pulley via a belt.
The paddy field work vehicle according to claim 1.

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