JP2008265373A - Prime mover structure of working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a prime mover structure of a working machine capable of favorably guiding cooling air by an airflow guiding cover, and easily performing the maintenance of a periphery of a cylinder part without being interrupted by the airflow guiding cover as necessary. <P>SOLUTION: An airflow guiding cover 50 for guiding cooling air fed to a cylinder part 30b is provided in a vicinity of the cylinder part 30b in an air-cooling type engine 30, and the airflow guiding cover 50 is positionally changed to the cooling air guiding position and the maintenance position for exposing the cylinder part 30b. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a prime mover structure of a working machine equipped with an air-cooled engine.

As a driving part structure of a riding type rice transplanter that is an example of a working machine equipped with an air-cooled engine, for example, as shown in Patent Document 1, an outer periphery of a cylinder part is disposed on an exhaust side of a cylinder part in the engine. There is known one provided with a wind guide cover for guiding the cooling air supplied to the periphery of the exhaust pipe.
Japanese Patent Laying-Open No. 2005-350013 (FIG. 4)

  According to the above structure, the radiant heat from the exhaust pipe is prevented from being propagated into the engine room by the wind guide cover, and the exhaust pipe is cooled by the cooling air introduced into the wind guide cover to reduce the exhaust temperature. Although the noise reduction effect can be enhanced, the wind guide cover becomes an obstacle when performing maintenance on the exhaust side of the engine, and it takes time to remove and install it.

  The present invention has been made paying attention to such points, and is capable of suitably performing cooling air guidance by the air guide cover, and if necessary, around the cylinder portion without being obstructed by the air guide cover. The purpose is to make it easy to maintain.

  According to a first aspect of the present invention, an air guide cover that guides the cooling air supplied to the cylinder portion is provided in the vicinity of the cylinder portion in the air-cooled engine. It is possible to change the position to a maintenance position that exposes.

According to the above configuration, the air guide cover can be installed at the cooling air guide operation position at normal times to provide suitable cooling air guidance. By moving the wind cover to the maintenance position, the cylinder portion can be exposed and maintenance around the cylinder can be easily performed from a wide space.
Therefore, according to the first aspect of the invention, normally, the cooling air guide by the air guide cover can be suitably performed, and the cylinder portion is not obstructed by the air guide cover without requiring troublesome removal operation of the air guide cover. Maintenance of the periphery can be easily performed, and workability of maintenance can be improved.

According to a second invention, in the first invention,
The fuel tank arranged in the upper part of the cylinder part is configured to be repositionable between a regular installation position and a maintenance open position, and the wind guide cover is interlocked with moving the fuel tank from the regular installation position to the open position. Is moved from the cooling air guide action position to the maintenance position.

  According to the above configuration, by moving the fuel tank from the normal installation position above the cylinder part to the open position, operations such as cleaning and replacement of the spark plug can be performed from a wide space above the cylinder part. With the movement of the fuel tank to the open position, the air guide cover is also moved from the cooling air guide operation position to the maintenance position, resulting in a state in which the periphery of the cylinder portion is opened, making maintenance work around the cylinder portion easier. Can be done.

According to a third invention, in the second invention,
The fuel tank is movably supported between the regular installation position and the open position, and the air guide cover is connected to the fuel tank so as to be integrally movable.

  According to the said structure, the interlocking movement of a fuel tank and a wind guide cover can be implemented easily.

  The whole side surface of the riding type rice transplanter which is an example of the working machine based on this invention is shown by FIG. This riding type rice transplanter has a parallel quadruple link structure driven by a hydraulic cylinder 4 at the rear of a four-wheel drive type traveling machine body 3 having a steerable front wheel 1 and a non-steerable rear wheel 2. A seedling planting device 6 is connected via a link mechanism 5, and a fertilizer device 8 is provided at a rear portion of a driver seat 7 provided at a rear portion of the traveling machine body 3, and a front part of the traveling machine body 3 is covered with a bonnet 9. The driving part 10 and the steering handle 11 are provided, and three stages of spare seedling platforms 12 are provided on the left and right lateral sides of the driving part 10, respectively.

  The seedling planting device 6 is configured to have a six-row planting specification. A seedling platform 15 on which seedlings are placed and reciprocated horizontally by a fixed stroke is cut out from the lower end of the seedling platform 15 by one stock. It comprises six sets of rotary planting mechanisms 16 that are planted on the surface, three leveling floats 17 that level the planting locations on the surface, and the like.

  The fertilizer application device 8 includes a fertilizer hopper 18 for storing granular fertilizer, three feeding mechanisms 19 for feeding the stored fertilizer by a set amount from the lower end of the hopper in increments of two, and feeding air to each feeding mechanism 19 An electric blower 20 and an air supply duct 21, a supply hose 23 for feeding fertilizer sent out from the feeding mechanism 19 by carrying the conveyance wind into six groovers 22 attached to the leveling float 17, and the like. The fertilizer that has been transported by wind power is sent and buried in a fertilizer groove formed on the paddy field in the vicinity of the side of the planted seedling by the grooving device 22.

  As shown in FIGS. 7 to 9, each feed mechanism 19 is connected to a horizontally long discharge duct 24 for discharging the fertilizer remaining in the fertilizer hopper 18, and the right side end of the machine body of the discharge duct 24 (FIG. 8). , 9 is connected to the peripheral end of the air supply duct 21 and a discharge hose 25 is connected to the left end of the exhaust duct 24 (the right end in FIGS. 8 and 9). The discharge duct 24 is made of a transparent resin material, and is configured to monitor the discharge state from the outside. The discharge hose 25 is configured to be stretchable and bellows, and a support pipe 26 that supports the discharge hose 25 from the inside and prevents it from hanging down is connected to the outer end of the discharge duct 24. The shortened discharge hose 25 is received and stored and held without swinging with the support pipe 26, and at the time of the fertilizer discharge operation in which the supply hose 25 is extended, an auxiliary step for replenishing seedlings disposed on the lateral side of the driver seat 7 14, the extended supply hose 25 does not come into contact.

  As shown in FIG. 2, an engine 30, a fuel tank 31, an engine accessory device, and the like are accommodated in the bonnet 9 in the driving unit 10. The engine 30 uses a horizontal axis type air-cooled gasoline engine having an output shaft 30c protruding leftward and is supported by a front frame 33 extending forward from the transmission case 32 in an anti-vibration manner.

  The engine power extracted from the output shaft 30a is belt-transmitted to a main transmission 34 comprising a hydrostatic continuously variable transmission (HST) connected to the left side surface of the transmission case 32, and output from the main transmission 34. The forward or reverse continuously variable transmission power is further gear-shifted into a plurality of stages by the transmission case 32 and transmitted to the front wheels 1 and the rear wheels 2. Only the forward rotation power of the continuously variable transmission power input to the mission case 32 is branched as PTO system power, and this PTO system power is shifted to a plurality of stages (inter-company shift) in the transmission case 32 and And is axially transmitted to the seedling planting device 6.

  A hydraulic power steering unit 35 and a handle post 36 that pivotally supports the steering handle 11 are installed on the top of the mission case 32. Although not shown, the pitman arm swingingly linked to the power steering unit 35 is not shown. The front wheel 1 is driven and steered by the motion.

  The engine 30 is configured to have a low-bulk cylinder portion 30b that is connected to the upper portion of the crankcase portion 30a, and the lower portion of the crankcase portion 30a is mounted and connected to the front frame 33 via an anti-vibration rubber 37. At the same time, the rear tilted cylinder portion 30 b is also supported by vibration isolation on the base end upper portion of the front frame 33 via the vibration isolation rubber 38.

  As shown in FIG. 3, a blower case 40 having a suction fan 39 driven by engine power is provided on the right side of the body of the engine 30, and the cold outside air sucked into the blower case 40 serves as cooling air in the cylinder portion 30 b. Is supplied to the outer periphery. An exhaust pipe 41 is led out from the left side of the machine body of the cylinder part 30b, and is connected to a muffler 42 disposed below the front part of the operation step 13.

  As shown in FIG. 3, the input shaft 34 a of the main transmission 34 is provided with a cooling fan 43 so as to cool the main transmission 34 by generating an airflow outward from the fuselage around the main transmission 34. In addition, a part of the warm air generated around the muffler 42 and the main transmission 34 is sent to the front end of the air guide duct 44 provided at the lower part of the fuselage by the blasting force of the cooling fan 43 to the rear of the fuselage. It has come to be guided. An intake duct 45 extends downward from the air intake portion of the electric blower 20 in the fertilizer application 8, and a front inlet of the intake duct 45 is disposed opposite to a rear end outlet of the air guide duct 44. Part of the warm air generated around the muffler 42 and the main transmission 34 is taken in through the air guide duct 44 and the intake duct 45 and used as fertilizer conveying air, so that the feeding mechanism 19 and the supply hose It is comprised so that the inside of 23 may be dried and adhesion deposit of manure powder may be controlled.

  As shown in FIG. 2, the upper part of the exhaust pipe 41 is covered with an air guide cover 50 that is open toward the aircraft body, and a part of the cooling air that is supplied from the right side of the cylinder part 30b and flows out to the left side is covered with the air guide cover. 50, the exhaust pipe 41 is cooled by the introduced cooling air to enhance the silencing effect, and the radiant heat from the exhaust pipe 41 is suppressed by the wind guide cover 50 from propagating into the engine room.

  As shown in FIG. 5, a pair of left and right support pipes 51 are fixed to the lower part of the handle post 36 in the front-rear direction, and the left and right support arms 52 inserted in the support pipes 51 so as to be slidable in the front-rear direction. The bottom of the tank 31 is connected and supported. The fuel tank 31 can be fixed to the regular installation position (a) by sliding the support arm 52 rearward and mounting a manually detachable stop pin (beta pin) 53 on the rearward projecting end. In the installation position (a), the replenishment port 31a of the fuel tank 31 is exposed above the bonnet 9, and fuel can be replenished without opening the bonnet 9. When the bonnet 9 is opened and the stop pin 53 is removed, the fuel tank 31 can be slid forward. As shown in FIG. 4, the fuel tank 31 is greatly moved to the front open position (b). By opening the upper part of the cylinder portion 30b, the spark plug (not shown) can be easily cleaned or replaced from a wide space.

  The fuel tank 31 in the regular installation position (a) overlaps above the cylinder portion 30b, and the bottom surface of the fuel tank 31 is close to the cylinder portion 30b and tilted forward and substantially parallel to the inclination of the cylinder portion 30b. The bottom surface of the fuel tank 31 functions as a guide surface that efficiently guides the cooling air supplied from the right side of the engine to the outer periphery of the cylinder portion 30b.

  The exhaust pipe 41 is covered by the air guide cover 50 from the lateral outer side, the upper side, and the front side, and is covered from the rear side by a rear cover 50a connected and fixed to the head of the cylinder part 30b. The wind guide cover 50 is connected to and supported by the fuel tank 31 that can be moved back and forth. When the fuel tank 31 is in the regular installation position (a), the wind guide cover 50 covers the exhaust pipe 41. When the fuel tank 31 is moved to the open position (b), the air guide cover 50 is moved to the maintenance position that is disengaged forward from the exhaust pipe 41.

[Other Examples]
(1) The wind guide cover 50 is supported so as to be swingable around a longitudinal fulcrum, and the wind guide cover 50 is closed to the cooling wind guide acting position by the movement of the fuel tank 31 to the normal installation position (a). The fuel tank 31 and the wind guide cover 50 are linked using a link mechanism or the like so that when the tank 31 is moved to the open position (b), the wind guide cover 50 is swingably opened to the laterally outward maintenance position. It is also possible

  (2) The air guide cover 50 can be configured independently of the fuel tank 31 so as to be movable to the cooling air guide operation position and the maintenance position.

Overall side view of riding rice transplanter Side view of the prime mover Plan view of the prime mover Side view of the prime mover with the fuel tank moved to the open position Partially cutaway side view showing fuel tank support structure Longitudinal rear view showing fuel tank support structure Side view showing feeding portion of fertilizer application device Development view showing fertilizer discharge structure of fertilizer application equipment Development view showing the structure of fertilizer discharge in the state of fertilizer discharge

Explanation of symbols

30 Engine 31 Fuel tank 30b Cylinder 50 Wind guide cover

Claims (3)

  An air guide cover for guiding the cooling air supplied to the cylinder portion is provided in the vicinity of the cylinder portion in the air-cooled engine, and the wind guide cover is provided with a cooling air guide operating position and a maintenance position for exposing the cylinder portion. The structure of the prime mover part of the working machine characterized in that the position can be changed.   The fuel tank disposed above the cylinder part is configured to be repositionable between a regular installation position and a maintenance open position, and the wind guide is linked to moving the fuel tank from the regular installation position to the open position. 2. The prime mover structure of a working machine according to claim 1, wherein the cover is configured to move from the cooling air guide operation position to the maintenance position.   3. The prime mover of a work machine according to claim 2, wherein the fuel tank is movably supported between the regular installation position and the open position, and the wind guide cover is connected to the fuel tank so as to be integrally movable. Construction.

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