JP4416554B2 - Mower - Google Patents

Description

  The present invention relates to a mower having a feature in a cooling structure of a prime mover.

As a cooling structure of the driving part in the mower, a box-shaped dustproof case is arranged in front of the radiator for cooling the engine, and clean outside air from which dust has been removed by a dust net on the intake surface of the dustproof case is supplied to the radiator. Such a configuration is known (for example, see Patent Document 1).
JP 2003-154857 A

  In order to clean the outside air for cooling, it is desirable to make the air intake surface of the dustproof case as large as possible.In the above conventional structure, the dustproof case is configured in a box shape. However, there is a limit even if the intake surface is enlarged, and the dry grass and mowing grass generated by mowing work are adsorbed on the intake surface of the dust-proof case, causing clogging. The air flow rate was reduced and cooling performance was sometimes lowered. In particular, in mowing work in a dry state, hay and mowing grass float frequently, so clogging is likely to occur in a short time, and it is often forced to interrupt the work to clean the dust-proof case. It was.

  The present invention has been made paying attention to such points, and continues the work with a good cooling function continuously for a long time even under working conditions in which hay and mowing grass float frequently. The main purpose is to be able to.

The mower according to the first aspect of the present invention is provided with a cooling air intake on the upper side in the intake direction of the cooling fan provided in the prime mover, and the power of the engine output shaft that drives the cooling fan is provided in the cooling air intake A rotary cutter that is driven to rotate, and the rotary cutter is configured by a rotary plate that covers the entire cooling air intake, and the rotary plate is provided with a group of intake air holes. The inner edge of each vent hole is formed as a blade edge, and the diameter of each vent hole is such that hay and cut grass can enter, and the rotating plate body rotates with respect to the entering hay and cut grass. The inner edge of the vent hole is formed in such a size that it can contact, and the blade edge formed on the inner edge of the vent hole is configured to be able to shred hay and cut grass. .

  According to the above configuration, even if hay and mowed grass are mixed in the outside air sucked into the cooling air intake, the air is blown off or shredded by the rotary cutter before the cooling air intake.

  Therefore, according to the first invention, there is no occurrence of clogging seen in the conventional means for filtering hay and the like with a dust screen, etc., and it is continuously performed for a long time even under working conditions in which hay and hay are floating frequently. The work can be continued with good cooling function.

According to the above configuration, the rotating plate body functions as a filtration screen that blocks passage of hay, etc., the function of jumping hay and cut grass close to the cooling air intake, and hay and cut grass that try to pass through the vent hole. It will have the function of shredding and jumping off .

A mowing machine according to a second invention is the above-mentioned first invention,
The cooling air intake is provided with an opening toward the front of the fuselage at the rear of the driver seat.

  According to the above configuration, the mower is located near the ground at the bottom of the fuselage, while the driver's seat is at the top of the fuselage, and the surrounding area is where there is relatively little floating of hay and mowing grass. The cooling air intake located in the area of the cooling air reduces the proximity of floating hay and mowing grass, and can effectively exert a dustproof function.

A mowing machine according to a third aspect of the present invention is the second aspect of the invention,
A dustproof cover having an intake opening is disposed at an upper portion between the cooling air intake and the driver seat.

According to the above configuration, large hay and mowed grass falling from above between the cooling air intake and the driver's seat are received by the dust cover and are prevented from approaching the cooling air intake. In this case, even if some hay and cut grass pass through the opening for ventilation of the dustproof cover, they are positively removed by the rotating cutter as described above. It may be large enough to remove mowed grass .

Therefore, according to the third aspect of the invention, it is possible to ensure a good air flow rate and exhibit a cooling function while providing a dustproof cover.

According to a fourth aspect of the present invention, in the mower according to any one of the first to third aspects, a cover body that blocks an outside air flow from below is disposed below the rotating cutter, and a bottom surface side of the cover body is disposed. The bottom of the inclined bottom surface of the inclined bottom surface is provided with a deposit discharge port provided with a lid body biased to the closed side , the one end side being lower than the other end side. The body is arranged in an oblique posture along the inclined bottom surface , and the end on the obliquely lower side of the lid is configured to be swingable and openable.

  According to the above configuration, the cover body prevents the hay and mowed grass that are frequently generated below the aircraft from being sucked into the cooling air intake, and the cover body is splashed or shredded by the rotating cutter. Receiving splashed hay and mowing grass and preventing them from floating again. Then, when the amount of hay and cut grass accumulated on the bottom surface of the cover body increases, it is possible to avoid being automatically or artificially discharged from the deposit discharge port and sucked into the cooling air intake port.

Therefore, according to the fourth aspect of the invention, it is effective to effectively suppress the approach of hay and mowed grass to the cooling air intake and to exhibit a good cooling function without clogging for a long time.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows the entire side surface of the mower according to the present invention, and FIG. 2 shows the plane thereof. This mower has a front link 4a, a rear link 4b, and a lower abdomen between the front and rear wheels in a traveling machine body 3 having a pair of left and right front wheels 1 configured as caster wheels and a pair of left and right rear wheels to be driven. The mower M is suspended and supported by a hydraulic cylinder 5 through a link mechanism 4 having a pair of left and right quadruple link structures composed of a lower connection link 4c, and the link mechanism 4 is moved up and down by a hydraulic cylinder 5. Thus, the mower M can be moved up and down substantially in parallel. A driving unit 7 that houses the engine 6 is provided at the rear of the traveling machine body 3 so as to protrude rearward from the rear wheel 2, and a grass collecting device 8 for collecting cut grass is provided so as to straddle the driving unit 7. In addition, a driver's seat 9 is provided in front of the driving unit 7, and a gate-shaped fall protection frame (ROPS) 10 is erected between the driving seat 9 and the driving unit 7.

Although the detailed description of the structure is omitted, the output of the engine 6 is input to the counter case 11 and branched into a traveling system and a working system, and the power of the traveling system is not shown in the figure disposed on the left and right sides of the counter case 11. Input to a pair of left and right hydraulic continuously variable transmissions (HST), and the shift output of each continuously variable transmission is separately transmitted to the left and right rear wheels 2 via the deceleration case 12, respectively. Then, the continuously variable transmission that drives the left and right rear wheels 2 shifts the left and right traveling levers 13 provided on the left and right sides of the driver's seat 9 so as to be able to swing back and forth separately. The rear wheels 2 are independently and continuously stepped forward and backward, and are moved forward and backward in accordance with the operating condition of the left and right traveling levers 13 with a difference in speed between the left and right rear wheels 2 driven in the same direction. Can be arbitrarily performed, such as a slow turn, a pivot turn in which one rear wheel 2 is stopped, and a spin turn in which the left and right rear wheels 2 are reversely driven. Further, the power of the branched work system is output forward from the PTO shaft 14 projecting from the lower front surface of the counter case 11 and transmitted to the mower M.

  As shown in FIG. 3, the mower M has three bar blades 16, 17, and 18 that are rotationally driven around the longitudinal axis in the same direction inside the deck 15 opened downward. The deck 15 is constructed as a flat deck whose top plate height is set to the same height as a whole, and a grass cutting outlet (not shown) is formed at the right end of the deck 15. Has been.

  The working power taken out from the PTO shaft 14 is transmitted to a bevel gear case 19 provided on the center upper surface of the deck 15 via a bendable and extendable shaft transmission mechanism 20, and the bevel gear case 19 The rotational power converted into the rotation is transmitted to the rotation shaft 17a of the central bar blade 17, and the rotation shaft 17a and the rotation shafts 16a and 18a of the left and right bar blades 16 and 18 are wound and interlocked by the belt 21. The rotary blades 16, 17, and 18 are rotationally driven in the same direction (clockwise as viewed from above) so that the first half of the rotation trajectory of each rotary blade 16, 17, 18 is directed toward the grass cutting outlet d. It is like that. An idle wheel (anti-scalar roller) 22 for getting over obstacles is provided around the deck 15.

  At the right end of the deck 15 in the mower M, a blower B for forcibly conveying the mowing grass discharged from the mowing grass discharge port toward the grass collecting device 8 at the rear of the machine body is detachably mounted. This blower B includes a rotating shaft 25 of a rotating blade 24 and a rotating shaft 18a of a right rotating blade 18 that are rotatably mounted around a longitudinal axis in a casing 23, and a first belt transmission mechanism 26 with a tension clutch and The second belt transmission mechanism 27 with automatic tension is interlocked and connected, and the front end of the cut grass transporting duct 28 of the casing 23 is connected by insertion.

  The grass collecting device 8 is configured to collect the grass cut and guided through the duct 28 in two grass collecting containers 30 mounted on the left and right sides of the driving unit 7 as follows. It is configured.

  A grass collecting frame 31 that supports the grass collecting device 8 is attached to the rear portion of the traveling machine body 3. The grass collecting frame 31 includes a pair of left and right vertical frames 31a that are pin-coupled across the left and right struts of the fall protection frame 10 and the engine mounting frame 29 located below the driving unit 7, and the left and right frame rods 31a. It is composed of a horizontal frame 31b laid across the upper part and four container support arms 31c extending rearward from the horizontal frame 31b. The container support arms 31c and the horizontal frame 31b are paired on the left and right sides. The upper edge of each grass collection container 30 is received and supported. A resin guide cover 33 is attached to the upper front portion of the grass collection frame 31 to cover the left and right grass collection containers 30 from above.

  The grass collection container 30 is sewn in a square bag shape with a highly breathable cloth material, and a core frame 34 made of a metal rod is inserted into a through hole 30a formed along the upper end opening edge of the container container opening. It is configured to hold the edge in a rectangle. The center of the rear end portion of the core frame 34 is divided for insertion into the through hole 30a, but is configured to be connected by a connection pipe 35 after insertion to prevent the core frame 33 from expanding and deforming.

  As shown in FIGS. 4 and 5, the guide cover 33 has a lateral width and a longitudinal width that cover the upper end openings of the left and right grass collection containers 30 in series, and is formed into a shape that is open downward as a whole. A C-shaped hinge fitting 36 attached to the front end of the grass-collecting frame 31 is pivotally connected to a bracket 37 provided at the front upper end of the grass collecting frame 31 so as to be swingable up and down around a horizontal fulcrum p. ing. Further, as shown in FIG. 8 (a), a fixed seal plate 38 is fixed to the horizontal frame 31b of the grass collecting frame 31 in a cantilever shape facing forward, and a movable seal plate 39 is provided near the front end of the guide cover 33. The lower end of the fixed seal plate 38 is fixed to face downward at a substantially right angle, and the gap between the front end portion of the guide cover 33 and the lateral frame 31b is closed by the seal plates 38 and 39. Yes.

  The mouth edge of the grass collection container 30 retained by the core frame 34 as described above is placed on and supported by the upper surfaces of the two container support arms 31c and the horizontal frame 31b, and protrudes from the center of the front end of the core frame 34. The provided locking member 32 is inserted into the opening 40 formed in the fixed seal plate 38 in a notch so as to be locked to the horizontal frame 31b from the front, and the container edge is formed at the lower end edge of the guide cover 33 lowered. By supporting, the shifting movement of the grass collection container 30 to the front, rear, left and right on the grass collection frame 31 and the lifting are prevented.

  The two container support arms 31c for mounting the pair of right and left grass collection containers 30 are disposed at a position slightly higher than the engine bonnet 41 in the driving section 7, and the inner two containers are covered with the engine bonnet 41. A bottom plate 42 is installed over the support arm 31c. The bottom plate 42 forms a tunnel passage 43 that connects the upper spaces of the left and right container mounting locations inside the guide cover 33 when the guide cover 33 is lowered. The cut grass introduced on the right side is guided by the guide cover 33 and guided to the left and right grass collection containers 30. Note that the grass cutting air blown into the inside of the guide cover 33 is extracted from the mesh-like air outlet 44 formed on the inner surface of the rear half of the guide cover 33 into the air exhaust passage 45 and is discharged below the rear part. It has become.

  Here, as shown in FIG. 8, the lower end of the movable seal plate 39 provided at the front end of the guide cover 33 moves along an arc locus s centered on the fulcrum p as the guide cover 33 is opened and closed. However, when the guide cover 33 is closed, the lower end of the movable seal plate 39 is approached to the upper surface of the fixed seal plate 38 behind the fulcrum p, and the guide cover 33 is opened forward and upward. The mounting position of the movable seal plate 39 is set with respect to the fulcrum p so that the lower end of the movable seal plate 39 approaches the upper surface of the fixed seal plate 38 in front of the fulcrum p. Regardless of whether the cover 33 is opened or closed, the gap between the front end of the guide cover 33 and the lateral frame 31a is closed by the rigid fixed seal plate 38 and the movable seal plate 39, so Is out is prevented, which avoids grass clippings to the drive unit 7 is Furikakari deposited.

  When maintenance of the prime mover 7 is performed, the pin connection portion q between the grass collection frame 31 and the overturn protection frame 10 is released, and the entire grass collection device 8 is centered on the pin connection point r with the engine mounting frame 29. Then, the periphery of the prime mover 7 can be released by turning backward.

  10 to 13 show the structure of the prime mover 7. An air-cooled gasoline engine is used as the engine 6 mounted on the prime mover 7, and the engine 6 is in a posture in which the air guide housing 52 including the cooling fan 51 driven by the engine output shaft 50 is directed forward. It is mounted and supported on the engine mounting frame 29. The outside air sucked by the cooling fan 51 is guided to the periphery of the head by the air guide housing 52 to cool the high temperature part, and then flows backward in the engine room, and is provided at the rear part in the engine room. After cooling, etc., it is discharged out of the machine.

  A circular cooling air intake 54 that is concentric with the engine output shaft 50 is formed on the front surface of the air guide housing 52, and a disk-shaped rotating cutter 55 that covers the cooling air intake 54 from the front surface is provided. And attached to the engine output shaft 50. The rotating cutter 55 is composed of a rotating plate body 56 made of a metal disk having substantially the same diameter as the cooling air intake 54, and a large number of air holes 57 are formed in the entire rotating plate body 56. Yes. And the opening inner edge of each ventilation hole 57 is maintained with being punched out, and has a function as a blade edge for chopping hay and cut grass approaching the ventilation hole 57.

  A partition wall 60 is provided at the front end of the engine room to partition the outside and the engine room. The partition wall 60 is disposed close to the front surface of the rotary cutter 55, and the central portion thereof is opened in a circular shape so as to face the cooling air intake 54. The partition wall 60 is divided into an upper partition wall 61 and a lower partition wall 62 with the rotation axis of the rotary cutter 55 as a boundary. A box-shaped dustproof cover 63 opened downward on the front surface of the upper partition wall 61. Is attached to the front surface of the lower partition wall 62, and a cover body 64 that blocks the left and right sides and the lower side is attached.

A large number of ventilation openings 65 are formed on the top surface, the left and right side surfaces, and the front surface of the dustproof cover 63 to prevent the worker from approaching the rotating cutter 55 without disturbing the flow of the cooling air, and to suck the dust. It is configured to accept long hay and mowing grass contained in the outside air.

  The cover body 64 has a function of blocking outside air under the machine body with a lot of floating hay and mowing grass from being sucked as cooling air, and catches the hay and the mowing grass splashed by the rotary cutter 55 so as not to be scattered around. It has a function. Further, the bottom end of the inclined bottom surface 64a of the cover body 64 is provided with a deposit discharge port 67 that is closed and biased by a rubber lid body 66, and a large amount of received hay and cut grass accumulate. When it comes, the lid 66 is automatically opened according to the weight of the deposit, and the deposit is discharged to the outside without being scattered.

Overall side view of mower Overall plan view of mower Moor's top view Side view of grass collector Rear view of the grass collector Side view of the grass collecting device with the guide cover open An exploded perspective view showing a part of the grass collecting apparatus Longitudinal side view showing the front end seal location of the grass collector The perspective view which shows the metal core for the mouth shape retention of a grass container Side view of the prime mover Plan view of the prime mover Front view of the prime mover Vertical side view of cooling air inlet

Explanation of symbols

7 Driving part 9 Driver's seat 54 Cooling air intake 55 Rotating cutter 56 Rotating plate 57 Vent hole 63 Dust-proof cover 64 Cover body 65 Opening 67 Deposit outlet

Claims (4)

A cooling air intake is provided on the upper side in the intake direction of the cooling fan provided in the prime mover, and a rotating cutter that is rotationally driven by the power of the engine output shaft that drives the cooling fan is provided in this cooling air intake And
The rotary cutter is composed of a rotary plate that covers the entire cooling air intake, and the rotary plate is provided with a group of ventilation holes, and the inner edge of each ventilation hole of the ventilation hole group is formed on the blade edge. And
The diameter of each of the vent holes is formed such that hay and cut grass can enter and the inner edge of the vent hole can come into contact with the entering hay and cut grass as the rotating plate rotates. A mowing machine configured to cut hay and mowing with a blade edge formed on the inner edge of the vent hole .   The mowing machine according to claim 1, wherein the cooling air intake is provided with an opening toward the front of the fuselage at the rear part of the driver's seat.   The mower according to claim 2, wherein a dustproof cover having an intake opening is disposed at an upper position between the cooling air intake and the driver seat. A cover body that blocks outside air flow from below is provided below the rotating cutter, and the bottom surface side of the cover body is configured as an inclined bottom surface that is inclined so that one end side is lower than the other end side. A deposit outlet having a lid biased toward the closed side is provided at the lower end of the inclined bottom surface, the lid body is disposed in an oblique posture along the inclined bottom surface , and obliquely below the lid body The mowing machine according to any one of claims 1 to 3, wherein the side end portion is configured to be swingable and openable.

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