JP2005253387A - Mower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mower provided with a plurality of parallelly installed rotating blades rotatably driven around vertical axes in the mower deck and a front baffle plate 18-installed front part of the inside of the mower deck having a shape following the rotation path of end of rotating blades, capable of mowing grasses in uniform length in the whole of mowing width by improving upside recovering of grasses passed through the front baffle plate. <P>SOLUTION: The mower comprises local depressed portions 18a, 18b on the bottom end of the front baffle plate 18 locating on the front part of the intermediate of the adjacent rotating blades 16L, 16C and 16R. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a mower mainly used for lawn mowing.

As mowers for lawn mowing, a plurality of rotating blades that rotate around the vertical axis are arranged in parallel inside a flat deck type mower deck with a flat ceiling surface, and at the inner front of the mower deck What provided the front part baffle plate of the shape along the front-end | tip rotation locus | trajectory of a rotary blade is known (for example, refer patent document 1).
US Pat. No. 5,987,863

  In the mower configured as described above, when the planted grass is introduced into the shredder chamber in the mower deck as the mower moves forward, the planted grass is pushed forward by the front wall of the mower deck and the front baffle plate. If this push-down is strong, the grass that has passed through the baffle plate will not be fully raised and will be cut. Therefore, by setting the ground clearance at the lower end of the front baffle plate to be slightly higher than the ground clearance at the lower end of the front wall of the moor deck, it is possible to minimize the push-down of the grass by the front baffle plate and pass through the front baffle plate. It is considered that the grass that has been brought up comes up quickly.

  In this way, by increasing the ground height of the lower end of the front baffle plate, it became possible to improve the cutting performance, but long grass on the cut track at the intermediate part of the rotating blades adjacent to the left and right Sometimes left streaks. In other words, turbulent flow is likely to occur because the rotating blades move in opposite directions and face each other at an intermediate portion between adjacent rotating blades, which makes the grass planting posture unstable and reduces cutting performance. This tends to cause a decrease in the finish.

  Further, in a mower equipped with a mower on the lower abdomen of the traveling aircraft, the grass stomped by the front wheels is insufficiently returned to stand up, and long grass may remain streaks on the cut.

  It should be noted that if the ground height at the lower end of the front baffle plate is increased overall, the vegetation grass will be able to stand up and return better, but according to this, a part of the cut grass that has been cut and spun off by the rotating blades is moved forward. The long cut grass that has leaked out flows through the space between the front wall of the deck and the front baffle plate without being shredded again by the rotating blade. Increasing the ground clearance at the lower end of the front baffle plate will reduce the finish.

  The present invention has been made paying attention to such points, and improves the standing return of the planted grass that has passed through the front baffle plate, and performs grass cutting with a uniform length over the entire cutting width. The main purpose is to provide moore that can.

According to a first aspect of the present invention, a plurality of rotating blades that are driven to rotate about the longitudinal axis are arranged in parallel inside the mower deck, and the front side of the shape along the tip rotation trajectory of the rotating blades is disposed at the inner front portion of the mower deck. In mowers with a baffle plate
A local recess is formed at the lower end of the baffle plate.

According to the above configuration, since the ground height is high at the location where the recess is formed, the grass passing through this recess formation site is less pushed down than the grass passing through the location without the recess,
The grass that has passed through the recess forming portion quickly rises and returns and receives the cutting action of the rotating blade. Moreover, since the ground height is low at the location where the recess is not formed, leakage of the cut grass forward is suppressed.

  Therefore, according to the first invention, by forming a recess in the front baffle plate corresponding to a place where the standing return of the planted grass tends to be insufficient, there is little leakage of the cut grass as a whole, and This makes it possible to perform mowing with a good finish that prevents a long streak-like cut mark from remaining.

According to a second invention, in the first invention,
The concave portion is arranged to be positioned in front of an intermediate portion of the adjacent rotating blade.

  According to the above configuration, even if a turbulent flow occurs in an intermediate portion between adjacent rotating blades, the vegetation grass rises and returns at this portion reliably and quickly, so that reliable cutting is performed. The first invention can be suitably implemented.

A third invention is the above first or second invention, wherein
A shredding baffle is configured to be detachable inside the mower deck.

  According to the above configuration, when the shredding baffle is installed inside the moor deck, it becomes a mulching form, and when the shredding baffle is removed, it becomes a side discharge form. The mowing grass will be prevented from flowing forward, and the rotating performance of the mowing grass with the rotating blade will be improved, and the side discharge form with excellent finish and the mowing work in the uniform mulching form over the entire cutting width will be performed. Can do.

A fourth invention is the invention according to any one of the first to third inventions,
In the space formed between the front wall of the mower deck and the front baffle plate, a vertical wall-shaped partition plate is provided along the front-rear direction, and this partition plate corresponds to the front position of each rotary blade. It is characterized by having been deployed.

  According to the above configuration, a part of the cut grass that is cut by each rotating blade and jumped to the lower side in the rotating direction flows out between the front wall of the deck and the front baffle plate and flows in a short circuit state with a long cutting length. Is suppressed by the partition plate, and as a result, the cutting blade performance of the rotating blade is enhanced, and a good shredding performance with little mixing of long cutting grass can be exhibited.

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

  FIG. 1 shows the entire side surface of the riding lawn mower equipped with the mower M according to the present invention, and FIG. 2 shows the plane thereof. In this lawn mower, a mower M has a quadruple link structure in the lower abdomen between front and rear wheels in a traveling machine body 3 having a pair of left and right front wheels 1 and a pair of left and right driving rear wheels 2 configured as caster wheels. 4 is configured to be suspended and supported by a hydraulic cylinder 5 so that the mower M can be moved up and down substantially in parallel. In addition, an engine 6 is mounted on the rear portion of the traveling machine body 3, and a driver seat 7 and a gate-shaped overturn protection frame (ROPS) 8 are disposed on the front portion thereof.

  Although the detailed description of the structure is omitted, the output of the engine 5 is input to the counter case 9 and branched into the traveling system and the 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 9. It is input to a pair of left and right hydraulic continuously variable transmissions (HST), and the shift output is separately transmitted to the left and right rear wheels 2 via the deceleration case 10. Then, the continuously variable transmission that drives the left and right rear wheels 2 shifts the left and right traveling levers 11 provided on the left and right sides of the driver's seat 7 so that they can swing back and forth separately. The rear wheels 2 are independently and continuously stepped forward and backward, so that the forward and backward travel, the pivot turn, and the spin turn can be arbitrarily performed by operating the left and right traveling levers 11. It has become. Further, the power of the branched work system is output forward from a PTO shaft 12 protruding from the lower front surface of the counter case 9 and transmitted to the mower M as will be described later.

  As shown in FIGS. 3 and 4, the mower M includes three rotary blades 16 </ b> L, 16 </ b> C, and 16 </ b> R that are driven to rotate about the longitudinal axis inside the mower deck 15 that is opened downward. 16C is arranged in a triangular arrangement in a plan view so that it slightly deviates forward and is pivotally supported, and the mower deck 15 is configured as a flat deck whose top plate height is set to the same overall height. In addition, a discharge port d provided with an outlet cover 17 for preventing scattering is formed at the right end.

  Further, on the inner front side of the moor deck 15, a front baffle plate 18 that is shallowly bent along the front portion of the tip rotation locus of each rotary blade 16L, 16C, 16R, and a rear portion of the tip rotation locus. A rear baffle plate 19 bent deep along is provided, and a series of shredding chambers that are long on the left and right are formed in the deck. The shredding spaces of the rotary blades 16L, 16C, and 16R communicate with each other.

  The working power extracted from the PTO shaft 12 is transmitted to a bevel gear case 21 disposed on the upper center surface of the mower deck 15 via a bendable / extendable shaft transmission mechanism 22, and the bevel gear case 21 rotates in the vertical axis. The rotational power converted into is transmitted to the rotary shaft 23C of the central rotary blade 16C, and the rotary shaft 23C and the rotary shafts 23L, 23R of the left and right rotary blades 16L, 16R are wound and interlocked by the belt 24, All the rotating blades 16, 17, 18 are rotationally driven at the same speed in the same direction (clockwise as viewed from above) so that the first half of the rotation locus of each rotating blade 16L, 16C, 16R is directed toward the discharge port d. It has become so. An idle wheel (anti-scalar roller) 25 is provided around the moor deck 15 for overcoming obstacles. When approaching the raised portion or the like, any of the freewheeling wheels 25 rides on the raised portion or the like, so that the mower M is relatively lifted, and the mower deck 15 is prevented from directly contacting and scraping the ground. It has become.

  Further, a long space on the left and right formed between the front wall 15a of the moor deck 15 and the front baffle plate 18 is partitioned by three vertical wall-shaped partition plates 24L, 24C, and 24R along the front-rear direction. . Here, the left partition plate 24L is located at a substantially front position of the left rotating blade 16, and the center and right partition plates 24C and 24R are slightly rotated from the front positions of the central rotating blade 16C and the right rotating blade 16R. It is deployed at a position deviated to the lower side.

  As shown in FIG. 14, the lower end shape of the front baffle plate 18 is configured as follows. That is, the left end portion of the lower end of the front baffle plate 18 is formed to be gradually higher than the lower end level of the front wall 15a of the mower deck 15, and the front baffle is located at the front portion of the left rotating blade 16L and the central rotating blade 16C. The lower end of the plate 18 is set to a level L1 higher by a predetermined amount than the lower end level L0 of the deck front wall 15a. Further, a concave portion 18a is formed at the lower end of the front baffle plate 18 at a portion facing the middle between the left rotating blade 16L and the central rotating blade 16C, and the lower end of the front baffle plate 18 is at the level at the formation portion of the concave portion 18a. Level L2 is higher than L1. In addition, a long recess 18b is formed in a range from a portion facing the middle between the center rotating blade 16C and the right rotating blade 16R to the right end of the baffle plate, and the level of the lower end in the forming portion of the recess 18b. L3 is equivalent to the lower end level L2 of the recess 18a. The lower ends of the three partition plates 24L, 24C, 24R protrude downward from the lower end of the front baffle plate 18, and are aligned slightly higher (for example, about 2 mm) than the lower end of the deck front wall 15a. It has been.

  The basic structure of the mower M is as described above. By changing the internal specifications of the mower deck 15, the side discharge configuration that discharges the cut mowing grass from the discharge port d on the right end of the deck, and the cut mowing grass are finely detailed. It is possible to select the mowing work in two forms of the mulching form that is left on the moor passage mark after cutting off, and the configuration and function of each form will be described below.

  [Side discharge form]

  FIGS. 3 and 4 show plan views of the mower M in the standard side discharge form as seen from the top side and the bottom side. In this form, the mower M is cut by the rotary blades 16L, 16C, and 16R. The cut grass is conveyed along the top plate 15a and the front baffle plate 18 toward the right side in the figure, and is smoothly discharged from the discharge port d at the right end of the deck.

  In this case, as the mower deck 15 moves forward, the grass planted on the ground passes through the lower ends of the mower deck 15 while being pushed forward by the deck front wall 15a and the front baffle plate 18 and is introduced into the shredding chamber. However, since the lower end of the front baffle plate 18 is generally at a higher level than the deck front wall 15a, the grass is gently pushed down by the front baffle plate 18 and passes through the front baffle plate 18. The grass thus raised quickly rises and is reliably cut by the rotary blades 16L, 16C, and 16R.

  Moreover, since the lower end level of the deck front wall 15a is low, the forward movement of the conveying wind generated by the rotating blades 16L, 16C, 16R is suppressed, and the ability to carry out the grass cutting from the discharge port d is maintained high. At the same time, the function of preventing the pebbles and branches that have been bounced off from jumping forward becomes high.

  In this case, turbulent flow is likely to occur because the rotating blades move in opposite directions and face each other at an intermediate portion between adjacent rotating blades. Although it tends to decrease, the recesses 18a and 18b are formed at the lower end of the front baffle play 18 at the front part of the intermediate part of the adjacent rotating blades to increase the ground clearance. Therefore, the formation of the recesses 18a and 18b is formed. The grass is further pushed down at the place, and the grass that has entered the front baffle play 18 rises up quickly and is subjected to a cutting action, and the occurrence of uncut residue at the intermediate portion of the adjacent rotating blade is suppressed. .

  A large amount of cut grass cut by the upper rotating blades 16L and 16C is conveyed to the cutting action area of the right rotating blade 16R located at the lowest position in the cutting grass discharge direction, and is introduced into this cutting action area. Since the vegetation grass is prevented from standing up, the recess 18b on the lower side is formed so as to extend not only to the intermediate portion between the central rotary blade 16C and the right rotary blade 16R but also to the entire cutting width of the right rotary blade 16R. The planted grass introduced into the cutting width of the blade 16R is easy to stand up.

  In addition, a part of the cut grass that is cut by the rotary blades 16L, 16C, and 16R and jumped to the lower side in the rotational direction flows between the deck front wall 15a and the front baffle plate 18 and remains in a long cutting length. Short circuit flow to the discharge port d is suppressed by the partition plates 24L, 24C, 24R. In this case, since each partition plate 24L, 24C, 24R is at a level lower than the lower end of the front baffle plate 18, the function of preventing the short circuit flow by the partition plates 24L, 24C, 24R becomes high. Moreover, although the lower end level of the partition plates 24L, 24C, and 24R is low, the partition plates 24L, 24C, and 24R are provided in a posture along the front-rear direction that is the traveling direction of the mower M. The grass is simply moved between the grasses, and the planted grass is not greatly pushed down at the lower ends of the partition plates 24L, 24C, 24R.

[Mulching form]
FIGS. 5 and 6 are a plan view and a perspective view, respectively, of the mower M configured in a mulching form as seen from the bottom surface side, and FIGS. 9 to 12 show vertical cross-sectional views of the respective portions. In this embodiment, a shredding baffle 26 formed hollow by resin molding is attached along the inside of the front baffle plate 18, and the shredding baffle 26 and the rear baffle plate 19 cooperate with each other. Thus, substantially circular shredded chambers 27L, 27C, and 27R surrounding the rotation trajectories of the respective rotating blades 16L, 16C, and 16R are formed for each blade, and each of the rotating blades 16L, 16C, and 16R has its own shape. In the shredding chambers 27L, 27C, 27R, the cut grass is carried around and repeatedly shredded.

  In this case, even if a part of the cut grass that is cut by the rotary blades 16L, 16C, and 16R and jumped to the lower side in the rotational direction flows between the deck front wall 15a and the front baffle plate 18, the partition plate 24L , 24C, 24R are restrained from flowing toward the discharge port d, fall down, and are introduced into the shredding chambers 27L, 27C, 27R as the aircraft advances, and as the rotating blades 16L, 16C, 16R rotate. The cut grass on the ground is sucked up and carried around in the shredding chambers 27L, 27C, and 27R, and uniform and fine shredding is repeated for each of the rotating blades 16L, 16C, and 16R. The cut grass is shredded in between.

  The detailed structure of the resin-molded shredding baffle 26 will be described below.

  The shredding baffle 26 closes the first baffle 26L facing the front part of the rotating blade (left) 16L, the second baffle 26C facing the front part of the rotating blade (center) 16C, and the discharge port d. In addition, a third baffle 26R facing the front portion of the rotating blade (right) 16R is integrally formed in series, and as shown in FIGS. 8 and 12, the top plate 15a of the mower deck 15 and the front baffle plate 18 are The three baffles 29 inserted from above into the connecting holes 28 of the deck top plate 15a are fastened to the insert nuts 30 on the upper surface of the baffle in a state of being brought into contact with the corner formed by the inner surface, so that the shredding baffle 26 Is stably and firmly fixed to a predetermined posture.

  The inner surfaces of the first baffle 26L, the second baffle 26C, and the third baffle 26R in the shredding baffle 26 are curved in an arc along the tip rotation trajectory of each rotary blade 16L, 16C, 16R in plan view. The guide vertical wall surface g receives and guides the cut grass that has been cut and bounced off by the bending blades f at both ends of the rotary blade. And this guide vertical wall surface g is comprised in the inclined surface which approached the blade rotating shaft center and approached inwardly and curved toward the deck ceiling surface. In this way, by forming the guide vertical wall surface g for each of the shredding chambers 27L, 27C, and 27R in the shredding baffle 26, the shredding chambers 27L, 27C, and 27R have the rotating blades 16L, 16C, and 16R. The cut grass that is cut and spun up by the rotation swirls along the guide vertical wall surface g and gradually falls due to its inclination, and the blade rotation axis is moved closer to the alley and falls, and is cut by the rotary blades 16L, 16C, and 16R. Repeatedly receiving the action, it will be efficiently shredded.

  Here, the guide phase wall surfaces g of the left and right first baffles 26L and third baffles 26R in the shredding baffle 26 are set to have an angle phase range smaller than 180 ° in the blade rotation direction, and the rotating blade rotating blade 16L. , 16R are set to a predetermined rotational phase so that the rotary blades 16L, 16R and the guide vertical wall surface g do not overlap each other when viewed from the blade rotation axis direction. In addition, the guide vertical wall surface g of the central second baffle 26C is set to have an angular phase range larger than 180 ° in the blade rotation direction, and the guide vertical wall surface g regardless of the rotation phase of the rotary blade 16C. At least one end of the rotary blade 16C overlaps when viewed from the blade rotation axis direction.

  Thus, when the shredding baffle 26 provided with the guide vertical wall surface g overlapping the tip rotation trajectory of each of the rotating blades 16L, 16C, 16R as viewed from the blade rotation axis is shown in FIG. In this way, the left and right rotary blades 16L, 16R are turned sideways, and only the central rotary blade 16C is removed from the rotary shaft 23C, so that the shredding baffle 26 is detached and attached to a predetermined position along the front baffle plate 18. can do.

  The adjacent shredded chambers 27 communicate with each other through an opening w having a small front and rear width at a portion where the blade line trajectory approaches, and the cut grass of one shredded chamber passes through the opening w. If it flows out into the adjacent shredding chamber, shredding performance deteriorates. Therefore, the corrugated head formed at the connecting portion between the first baffle 26L and the second baffle 26C and the corrugated head formed at the connecting portion between the second baffle 26C and the third baffle 26R are as follows. By devising, the grass cutting outflow at the opening w is prevented.

  That is, as shown in FIG. 13, the second vertical baffle 26 </ b> C is deflected toward the end of the guide vertical wall surface g in the blade rotation direction more toward the rotation axis than the tangential direction with respect to the tip rotation locus of the rotation blade 16 </ b> C. An end guide surface h that guides the mowing grass and discharges it into the shredding chamber 27C is provided, so that the mowing grass swirling along the guide vertical wall surface g does not flow toward the opening w.

  In addition, a start end guide surface i slightly inclined toward the shredding chamber 27R side is provided at the start end portion of the guide vertical wall surface g in the blade rotation direction of the third baffle 26R, and the rotary blade is swirled by 16R. Then, the cut grass that reaches the opening w is guided to the shredded chamber 27R side by the leading end guide surface i, thereby preventing the cut grass from flowing out from the shredded chamber 27R to the adjacent shredded chamber 27C.

  Although not shown, a terminal guide surface h similar to that described above is provided at the terminal end of the first baffle 26L in the blade rotation direction of the guide vertical wall surface g, and the guide vertical wall surface g of the second baffle 26C is provided. The starting end guide surface i similar to the above is also provided at the starting end in the blade rotation direction, and the outflow of cut grass from the shredded chamber (left) 27L to the shredded chamber (center) 27C and the shredded chamber (center) ) Prevents outflow of cut grass from 27C to shredded chamber (left) 27L.

[Another embodiment]
The present invention can also be implemented in the following forms.

  (1) In the mulching configuration in which the shredding baffle 26 is attached, if the recess formed in the lower end side of the front baffle plate 18 is closed with another member, the left rotating blade 16L can be rotated in the shredding chamber 27L. Is expensive.

  (2) As shown in FIG. 15, it is also possible to carry out by forming the recesses 18a and 18b on the lower end side of the front baffle plate 18 only at a portion corresponding to the middle of adjacent rotating blades.

(3) The lawn mowing work in a mulching form with high shredding efficiency can be performed also by implementing the cross-sectional shape of each guide vertical wall surface g provided in the shredding baffle 26 as a linear inclined surface. However, in order to increase the corner space for turning and guiding the cut grass that has been cut off and raised, the processing ability is increased, and the inclined surface that is straightly recessed with an obtuse angle or the above As described above, it is desirable to use an inclined surface that is concavely curved.
(4) The shuffling baffle 26 can be divided into two or three parts, and such a split structure has an advantage that the shredded baffle can be stored low in bulk. .

  (5) When the bolt 29 for fastening the shredding baffle 26 to the deck top plate 15a is a butterfly bolt or a bolt with a handle, the shredding baffle 26 can be attached and detached without a tool, and the lawn mowing work configuration Is easy to switch.

  (6) When the shredding baffle 26 is a resin-molded product obtained by blow molding, it is advantageous in terms of weight reduction. However, wear of the shredding baffle 26 is a problem depending on the type of turf grass and soil conditions of the turf. In this case, a shredded baffle made of sheet metal that has been press-worked or welded can also be employed.

  (7) Insert bolts are provided on the upper surface of the resin shredding baffle 26, or stud bolts are provided on the upper surface of the sheet metal shredding baffle. It is also possible to tighten and connect with a wing nut.

  (8) In the above embodiment, the three-blade mower M is illustrated, but the present invention can also be applied to a two-blade type.

Overall side view of riding lawn mower Overall plan view of a riding lawn mower Plan view showing a mower with side discharge Side view of the mower in the form of side discharge Top view of mulching mower Perspective view of mulching mower Exploded perspective view of mulching mower Exploded plan view of mulching mower IX-IX cross section in Fig. 5 XX cross section in FIG. XI-XI cross section in Figure 5 XII-XII cross section in Fig. 5 Plan view showing the main part of shredding baffle Front baffle plate longitudinal rear view Vertical rear view of the front baffle plate of another embodiment

Explanation of symbols

15 Moor Deck 15a Front Wall 16L Rotating Blade 16C Rotating Blade 16R Rotating Blade 18 Front Baffle Plate 18a Recessed 18b Recessed 24L Partition Plate 24C Partition Plate 24R Partition Plate 26 Shredding Baffle

Claims (4)

A plurality of rotating blades that are driven to rotate around the longitudinal axis are arranged in parallel inside the mower deck, and a front baffle plate having a shape along the tip rotation trajectory of the rotating blade is provided on the inner front portion of the mower deck. In Moore,
A mower characterized in that a local recess is formed at the lower end of the front baffle plate.   The mower according to claim 1, wherein the recess is arranged to be positioned in front of an intermediate portion of the adjacent rotating blade.   The mower according to claim 1 or 2, wherein a shredding baffle is configured to be detachable inside the moor deck.   In the space formed between the front wall of the mower deck and the front baffle plate, a vertical wall-shaped partition plate is provided along the front-rear direction, and this partition plate corresponds to the front position of each rotary blade. The mower according to claim 1, wherein the mower is arranged.

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