JP4104147B2 - Moore - Google Patents

Description

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

As mowers for lawn mowing, a plurality of rotating blades driven 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 The thing provided with 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

  The mowers with the above configuration are mowing work in a side discharge form that sends the mowing grass cut by each rotating blade to one side of the moor deck and discharges it, and each rotating blade by attaching a shredding baffle in the mower deck Each chopping chamber is formed so that mowing is carried out in each chopping chamber and chopped and left on the ground. In the mowing operation in the form, a part of the cut grass that has been cut and bounced off by a rotating blade flows out into the space formed between the front wall of the mower deck and the front baffle plate and is discharged for a long time. There was a case. Also, in mowing work in the mulching form, the mowing grass that has flowed into the space formed between the front wall of the mower deck and the front baffle plate flows and is biased in the direction of mowing discharge in the side discharge, resulting in side discharge. The shredding performance of the rotating blade located in the cutting grass discharge direction at the time of the cutting is reduced, and the shredded cut grass may not be left uniformly over the entire cutting width.

  The present invention has been made paying attention to such a point, and by improving the cutting blade performance of the rotating blade, the mower capable of exhibiting good shredding performance with little long cutting grass mixed. The main purpose is to provide

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
Along the front-rear direction, the mowing grass that has flowed out into the space is prevented from flowing toward the discharge port at the front position of each rotary blade 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, and the lower end of the front baffle plate is positioned higher than the lower end of the front wall of the mower deck, and the lower end of the partition plate projects downward from the lower end of the front baffle plate. It is characterized by being allowed .

  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.

  Therefore, according to the first aspect of the invention, it is possible to improve the cutting performance of the rotating blade, and to exhibit good shredding performance with little long grass.

  According to the above configuration, since the outflow of mowing grass is suppressed by the partition plate in each of the plurality of rotating blades arranged in parallel, the mowing grass carrying performance in each rotating blade is high, and uniform shredding is performed over the entire cutting width. This makes it possible to perform mowing work with excellent finish.

  According to the above configuration, the grass planted on the ground is introduced into the shredding chamber through the lower end of the mower deck while being pushed forward by the front wall and the front baffle plate of the deck. However, the lower end of the front baffle plate is generally at a higher level than the front wall of the deck, so that the grass is gently pushed down by the front baffle plate, and the grass that has passed through the front baffle plate stands up quickly. It returns and is reliably cut with each rotating blade. In this case, the gap between the lower end of the front baffle plate and the ground becomes large, so that the mowing grass flows under the lower end of the front baffle plate and easily flows to the discharge port side. Suppress.

Therefore, by increasing the lower end of the front portion baffle plate, it is possible to exert a high cutting performance by satisfactorily performed orthostatic return grass having passed through the front baffle plate, the lower end of the front baffle plate adverse effects due to high the Ki out be compensated by the partition plate, the upper Symbol effect can be more remarkably exhibited.

According to a second invention, in the first invention ,
A shredding baffle is detachable inside the mower deck.

  According to the above configuration, when the shredding baffle is installed inside the moor deck, it becomes a mulching specification, and when the shredding baffle is removed, it becomes a side discharge specification. With the partition plate provided between the baffle plate, the outflow of mowing grass is suppressed, and the mowing performance of the mowing grass with the rotating blade is enhanced, and the side discharge form with excellent finish and the uniform mulching form over the entire cutting width Can perform mowing work.

  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 as to be able to 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. The power of the branched working system is output toward the front from the PTO shaft 12 projecting from the lower front of the counter casing 9, and is transmitted to the mower unit M as you 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-scal roller) 25 for getting over obstacles is provided around the moor deck 15, and the mower M suspended and supported by the link mechanism 4 with upward movement flexibility is provided with a slope on the ground. 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 over a range from a portion facing the middle between the central rotary blade 16C and the right rotary blade 16R to the right end of the baffle plate, and the level L3 at the lower end of the formation portion of the recess 18b is the level of the recess. This is equivalent to the lower end level L2 of 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 these lower ends 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 rises and returns quickly and is reliably cut by the rotating 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 the drop tend lower end in a recess 18a of the front baffle plates 18 in the front portion of the intermediate portion of the rotating blades adjacent, so to form 18b are to increase the ground clearance, the recess 18a, 18b of the At the formation site, the grass is further pushed down, and the grass that has entered the front baffle play 18 rises up quickly and is subjected to a cutting action, thereby suppressing the occurrence of uncut residue at the intermediate portion between adjacent rotating blades. The

  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, and 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 has been cut and spun up by the rotation swirls along the guide vertical wall surface g and gradually falls due to its inclination, with the blade rotation axis centering on the side and falling, and the cutting action by the rotary blades 16L, 16C, and 16R. the repeated received, it is possible to repeatedly be efficiently shredded.

Here, the guide vertical wall surface g of the first baffle 26L and the third baffle 26R of the left and right in the shredding baffle 26, angular phase range of the blade rotating direction is set smaller than 180 °, rotation blade 16L, When 16R is set to a predetermined rotational phase, the rotary blades 16L and 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.

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 rotation locus approaches, and the cut grass of one shredded chamber passes through the opening w. If it passes through and flows into the adjacent shredding chamber, shredding performance is degraded. 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.

Further, the starting end of the blade rotation direction of the guiding longitudinal wall surface g at the third baffle 26R, start guide surface i was a bit inclined toward the shredding chamber 27R side are provided, thus being swirling fluidized in rotating blades 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) Lawn mowing work in a mulching form with high shredding efficiency can also be performed 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.
(3) 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. .

  (4) If 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.

  (5) When the shredding baffle 26 is a resin molded product obtained by blow molding, it is advantageous in reducing the weight, but the shredding baffle 26 has a problem of wear depending on the type of turf grass or the 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.

  (6) An insert bolt is provided on the upper surface of the resin shredding baffle 26, or a stud bolt is provided on the upper surface of the sheet metal shredding baffle. It is also possible to tighten and connect with a wing nut.

  (7) 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

Explanation of symbols

15 Moor deck 15a Front wall 16L Rotating blade 16C Rotating blade 16R Rotating blade 18 Front baffle plate 24L Partition plate 24C Partition plate 24R Partition plate 26 Shredding baffle

Claims (2)

A plurality of rotating blades that are driven to rotate about 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,
Along the front-rear direction, the mowing grass that has flowed out into the space is prevented from flowing toward the discharge port at the front position of each rotary blade 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, and the lower end of the front baffle plate is positioned higher than the lower end of the front wall of the mower deck, and the lower end of the partition plate projects downward from the lower end of the front baffle plate. Mohr characterized by being allowed to .   The mower according to claim 1, wherein a shredding baffle is detachable inside the moor deck.

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