JP4791932B2 - Moore - Google Patents

Description

  In the present invention, a pair of rotary cutting blades that can be driven and rotated around the vertical axis of the cutting blade housing are arranged side by side in the horizontal direction of the cutting blade housing, and the cutting blade housing is viewed in the front-rear direction. The present invention relates to a mower provided with a front baffle formed in front of the pair of rotary mowing blades so as to form an overlapping portion where the rotation areas of the pair of rotary mowing blades overlap and to guide and act on the wind from the pair of rotary mowing blades.

  Conventionally, for example, Patent Document 1 discloses a mower described above. Patent Document 1 discloses an overlap portion in which three blades (corresponding to a rotary cutting blade) arranged in the lateral direction of a deck (corresponding to a cutting blade housing) and a rotation locus (corresponding to a rotation region) of the blades merge. (Corresponding to the overlapping portion) and a guide plate (corresponding to the front baffle).

  In this type of mower, when the grass to be mowed enters the superposed portion, a marrowing defect such as uncut mushrooms is likely to occur. For this reason, the mower shown by patent document 1 is provided with the weed board, and is aiming at suppression of the said mowing process defect. That is, turf grass entering the overlap portion from the front side is distributed to the left and right sides by the separating action of the weed board and divided and sent to the rear.

JP 2002-153112 A (paragraphs [0005]-[0008], [0015]-[0021], FIG. 1-3)

  When the above-described conventional technique is employed, it is necessary to specially provide a weed board. For this reason, a recessed space with a forward opening is formed on the front side of the front baffle by the weed board and the front baffle, and the lateral width of the recessed space becomes narrower toward the rear side, and the weeds are divided by the weed board. It was easy for the grass to get stuck between the weed board and the front baffle. In addition, the number of necessary members has increased.

  An object of the present invention is to provide a mower that can suppress the entry of grass into the superposition part while avoiding the above-described problems.

In the first invention, a pair of rotary cutting blades that can be driven and rotated around the vertical axis of the cutting blade housing are arranged side by side in the horizontal direction of the cutting blade housing, and the cutting blade housing is viewed in the longitudinal direction. In a mower having a front baffle positioned in front of the pair of rotary mowing blades so as to form an overlapping portion where the rotation areas of the pair of rotary mowing blades overlap, and to guide and act on the wind from the pair of rotary mowing blades ,
The front wall of the cutting blade housing is a pair of front arc wall portions along the outer periphery of the front portion of the rotation area of the pair of rotary cutting blades, and a virtual line that is a common tangent to the pair of front arc wall portions. And a straight front straight wall portion that connects the pair of front arc wall portions and is located in a state of entering the rear side,
The front baffle includes a lateral one end side facing the rotation area of one rotary cutting blade of the pair of rotary cutting blades of the front baffle, and a lateral other end side part facing the rotation area of the other rotary cutting blade. The boundary of the front baffle is positioned away from the overlapping portion on the side of the cutting blade housing, and the front end of the baffle is directed toward the position where the grass is removed from the overlapping portion on the side of the cutting blade housing. And press to configure ,
It said front baffle, Oh Ru are detachably attached to the front straight wall portion of the front wall of the cutting blade housing.

  According to the structure of this 1st invention, the grass which is going to enter into the superposition | polymerization part from the front is pressed by the horizontal one end side part of a front baffle toward the location removed from the superposition part to the cutting blade housing side end side. This makes it difficult for grass to enter the polymerization portion. And a front baffle is utilized for the press means which prevents the penetration | invasion to the superposition | polymerization part of a grass, and the penetration | invasion to the superposition | polymerization part of a grass can be suppressed.

  Therefore, the simple structure using the front baffle as a means of pressing the grass suppresses the entry of the grass into the overlapped area, avoiding the clogging of the grass described at the beginning of the good-finishing mowing work that is unlikely to cause cutting residue. Can be carried out efficiently and at low cost.

According to a second aspect of the present invention, in the configuration of the first aspect of the present invention, a rear wall of the cutting blade housing is provided with a pair of rear arc wall portions along an outer periphery of a rear portion of a rotation area of the pair of rotary cutting blades, The rear arc wall portion is configured to be located in a state of entering the front side of the imaginary line that is a common tangent to each of the rear arc wall portions and includes a straight rear straight wall portion that connects the pair of rear arc wall portions,
A rear baffle positioned behind the pair of rotary cutting blades is detachably attached to the rear straight wall portion of the rear wall of the cutting blade housing .

According to the third aspect of the present invention, in the configuration of the first or second aspect of the present invention, an openable / cuttable cut grass discharge port is provided at a lateral end of the cutting blade housing, and the cut grass discharge port is opened to cut the cut grass. A side discharge operation mode in which the mowing blade housing discharges from the lateral end of the mowing blade to the outer side of the mower, and the mowing grass discharge port is closed, and the mowing grass from each rotary cutting blade is discharged from the bottom of the mowing blade housing to the lower side of the mower. The mulching work mode is configured to be able to appear.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is an overall side view of a riding mower mounted with a mower 10 according to an embodiment of the present invention. As shown in this figure, the riding mower is configured to be self-propelled by a pair of left and right front wheels 1 and 1 and a pair of left and right driveable rear wheels 2 and 2, and a steering wheel. A mower 10 according to an embodiment of the present invention, which is connected via a link mechanism 6 between a self-propelled vehicle body having a driving section having a wheel 3 and a driver seat 4 and front and rear wheels of a body frame 5 of the self-propelled vehicle body. And. The self-propelled vehicle body includes an engine 7 provided at the front portion of the vehicle body, and transmits the output from the output shaft 7 a of the engine 7 facing the vehicle body to the cutting blade drive mechanism 30 of the mower 10 by the transmission belt 8. The link mechanism 6 includes an elevating link 6a connected across the front end portion of the body frame 5 and the rear end side of the cutting blade housing 11 of the mower 10, and a rocker connected across the intermediate portion of the elevating link 6a and the body frame 5. A moving link 6b and a connecting link 6c connected across one end of the swinging link 6b and the front end side of the cutting blade housing 11 are provided. The lift link 6a is swung up and down with respect to the vehicle body frame 5 when the lift lever 9 linked to the rear end portion of the lift link 6a via the interlock mechanism 9a is swung up and down. The rear end side of the mower 10 is moved up and down with respect to the vehicle body frame 5. When the lifting link 6 a is swung up and down, the swing link 6 b is swung up and down with respect to the body frame 5, and the front end side of the mower 10 is lifted up and down with respect to the body frame 5.

  That is, the riding mower performs the mowing work. That is, when the lifting lever 9 is swung up and down, the link mechanism 6 is swung up and down with respect to the vehicle body frame 5 and the mower 10 is in a lowering work state in which the pair of left and right gauge wheels 12 and 12 are grounded. Then, each gauge wheel 12 is moved up and down to a non-working state in which the gauge wheel 12 is raised from the ground. When the self-propelled vehicle body travels with the mower 10 in the descending work state, the mower 10 rotates and drives the two rotary mowing blades 13L and 13R located inside the mowing blade housing 11 by the mowing blade driving mechanism 30. The grass and grass (hereinafter simply referred to as grass) are cut by the rotary mowing blades 13L and 13R, and the grass and grass (hereinafter simply referred to as mowing grass) from the rotary mowing blades 13L and 13R. ) Is discharged from the lateral end of the cutting blade housing 11 to the mower lateral outer side, or a mulching operation is performed in which the mowing grass from the rotary cutting blades 13L and 13R is discharged from the bottom of the cutting blade housing 11 to the lower side of the mower. .

  Next, the mower 10 will be described in detail. FIG. 2 is a plan view of the mower 10 in a mulching work state. FIG. 3 is a plan view of the mower 10 in the side discharge operation state. FIG. 4 is a plan view of the mower 10 with the top plate removed. As shown in these drawings, the mower 10 is disposed outside the cutting blade housing 11, the cutting blade drive mechanism 30, the two rotary cutting blades 13 </ b> L and 13 </ b> R, and the front portion of the cutting blade housing 11. In addition to the pair of left and right gauge rings 12 and 12 provided in a distributed manner at both lateral ends of the cutting blade housing, the cutting blade housing 11 is disposed outside the rear portion of the cutting blade housing 11 at the central portion in the horizontal direction of the cutting blade housing. The obstacle climbing roller 15 is provided.

FIG. 5 is a perspective view from the bottom side of the cutting blade housing 11. As shown in this figure, and FIGS. 2 and 4, the cutting blade housing 11 includes a top plate 16, a front wall 17, a rear wall 18, and a lateral wall that extend downward from the peripheral edge of the top plate 16 toward the cutting blade housing. 19 and a pair of mowing chambers 20L and 20R arranged in the lateral direction of the cutting blade housing 11 are provided. The front wall 17 has a linear shape that connects the front arc wall portion 17a along the outer periphery of the front side portion of the rotation regions 13LA and 13RA of the rotary cutting blades 13L and 13R and the pair of front arc wall portions 17a and 17a. And a front straight wall portion 17b. The rear wall 18 includes an arc-shaped rear arc wall portion 18a along the outer periphery of the rear portion of the rotation area 13LA, 13RA of each rotary mowing blade 13L, 13R, and the pair of rear arc wall portions 18a, 18a. And a straight rear straight wall portion 18b to be connected. The lateral wall 19 has an arc shape along the outer periphery of the lateral portion of the rotation area 13LA of the one rotary cutting blade 13L. The pair of cutting chambers 20 </ b> L and 20 </ b> R are slightly displaced in the front-rear direction of the cutting blade housing 11, and communicate with each other at the central portion of the cutting blade housing 11 in the lateral width direction. The mowing chambers 20 </ b> L and 20 </ b> R are opened downward on the bottom side of the cutting blade housing 11. Of the pair of mowing chambers 20L and 20R, the mowing chamber 20R located slightly behind the cutting blade housing is a lateral end opposite to the side of the mowing chamber 20R communicating with the other mowing chamber 20L. and a cutting Ri grass discharge port 14 communicating with the part. The edge metal 28 shown in FIG. 5 is attached to the cutting blade housing 11 along the lower end of the rear wall 18.

As shown in FIGS. 4 and 6, one rotary mowing blade 13L of the two rotary mowing blades 13L, 13R is connected to one mowing chamber 20L of the pair of mowing chambers 20L, 20R and the other rotary mowing blade 13R. Are respectively located in the other mowing chamber 20R. Each of the rotary cutting blades 13L and 13R is attached to a lower end portion of a rotation support shaft 22 rotatably supported on the top plate 16 via a bearing holder 21 so as to be integrally rotatable. That is, the rotary cutting blades 13 </ b> L and 13 </ b> R rotate together with the rotary spindle 22 around the cutting blade housing vertical axis P included in the rotary spindle 22. The two rotary cutting blades 13L and 13R are arranged in the horizontal direction of the cutting blade housing in a state where the cutting blade housing 11 is slightly displaced in the front-rear direction, and one rotary cutting blade 13L is viewed in the front-rear direction of the cutting blade housing 11. Of the rotation region 13LA and the rotation region 13RA of the other rotary cutting blade 13R overlap each other to form an overlapping portion 23. Each rotary mowing blade 13L, 13R includes a cutting blade 24 provided at both ends of the rotary mowing blades 13L, 13R, and a wind blade 25 provided on the back side of each cutting blade 24.

FIG. 2 shows the structure of the cutting blade drive mechanism 30 in plan view. FIG. 6 shows the structure of the cutting blade drive mechanism 30 in a front view. As shown in these drawings, the cutting blade drive mechanism 30 includes an input shaft 31 that is rotatably supported on the rear end portion of the top plate 16 in a mounting posture in the vertical direction of the cutting blade housing, and is integrated with the input shaft 31. A transmission pulley 32 that is rotatably supported, a cutting blade drive pulley 33 that is rotatably supported integrally with the rotary support shaft 22 of each of the rotary cutting blades 13L and 13R, and a transmission pulley 32 and each of the cutting blade drive pulleys. 33 and a power transmission belt 34 wound around. The input shaft 31 includes an input pulley 35 around which the transmission belt 8 is wound and is positioned on the upper end side of the input shaft with respect to the transmission pulley 32 so as to be integrally rotatable. The transmission belt 34 is also wound around a guide pulley 36 rotatably supported on the top plate 16 and a tension pulley 38 supported on the input shaft 31 via a tension arm 37.
That is, the cutting blade drive mechanism 30 transmits the driving force of the input shaft 31 that is transmitted from the engine 7 to the input pulley 35 via the transmission belt 8 and is driven to each cutting blade drive pulley 33 by the transmission belt 34. The rotary spindle 22 is rotationally driven, and thereby the rotary mowing blades 13L and 13R are rotationally driven. One rotary mowing blade 13L is driven to rotate in the rotation direction A (see FIG. 4) around the axis P of the rotary support shaft 22, and the other rotary mowing blade 13R is rotated around the axis P of the rotary support shaft 22. The rotary cutting blade 13L is driven to rotate in the rotation direction B (see FIG. 4) opposite to the rotation direction A.

  As shown in FIGS. 2, 3, and 6, the cutting blade housing 11 includes a lid body 26 provided at a lateral end portion on the side where the cut grass discharge port 14 is located outside the cutting blade housing. The lid body 26 is supported by a support arm 26a that is swingably extended from the rotary spindle 22 of the rotary mowing blade 13R. When the lid body 26 is moved together with the support rail 26a, the cut grass discharge port is provided. 14 is opened and closed. As shown in FIGS. 2 and 6, the cutting blade housing 11 includes a discharge guide 27 that is supported near the cut grass discharge port 14 of the top plate 16. The discharge guide 27 is supported so as to be swingable up and down, and guides the cut grass discharged from the cut grass discharge port 14 so as to scatter laterally outward by being switched to a lowering action posture.

  As shown in FIGS. 4 and 5, the cutting blade housing 11 includes a front baffle 40 disposed in front of the pair of rotary cutting blades 13L and 13R inside the cutting blade housing. FIG. 4 shows the structure of the front baffle 40 in plan view. FIG. 5 shows a perspective structure of the front baffle 40. FIG. 8 shows a longitudinal sectional structure of the front baffle 40. FIG. 9 is a cross-sectional plan view of the front baffle 40. As shown in these drawings, the front baffle 40 is connected via a mounting bracket 41 connected to the upper end of the front baffle 40 and a connecting bolt 42 that fastens and connects the mounting bracket 41 to the front straight wall portion 17b. It is comprised by the bending board connected with the front straight wall part 17b. The front baffle 40 has a lateral end side portion 43 positioned on the lateral end side in the lateral direction of the cutting blade housing, a lateral other end side portion 44 positioned on the lateral other end side in the lateral direction of the cutting blade housing, and the lateral end portion And a bending point forming a boundary 45 between the side portion 43 and the lateral other end side portion 44.

The horizontal one end side portion 43 smoothly continues to the inner surface of the front arc wall portion 17a of the mowing chamber 13LA without the cut grass discharge port 14, and rotates the rotary mowing blade 13L located in the mowing chamber 20L. A flat guide surface 43a facing the region 13LA is provided, and the wind from the rotary cutting blade 13L is guided by the guide surface 43a so as to flow toward the rotation region 13LA. The lateral other end 44 is smoothly connected to the inner surface of the front arc wall portion 17a of the cutting chamber 20R provided with the cut grass discharge port 14, and the rotary cutting blade 13R positioned in the cutting chamber 20R. A flat surface-shaped guide surface 44 a facing the rotation area 13 RA is provided, and the wind from the rotary cutting blade 13 R is guided by the guide surface 44 a so as to flow toward the cut grass discharge port 14. The lateral end side portion 43 is provided with a pressing surface 43b facing forward of the cutting blade housing located on the side opposite to the guide surface 43a in an inclined state with respect to the longitudinal direction of the cutting blade housing. The boundary 45 is located on the lateral end side of the cutting blade housing 11 where the cut grass discharge port 14 is located from the overlapping portion 23, and is an end of the pressing surface 43b in the horizontal direction of the cutting blade housing. Thus, the end on the side where the boundary 45 is located is located away from the overlapping portion 23 on the lateral end side of the cutting blade housing 11 where the cut grass discharge port 14 is located.
The front baffle 40 includes a bottom plate 46 extending from the lower end portion of the front baffle 40 toward the rear of the cutting blade housing.
That is, the front baffle 40 presses the grass that is about to enter the overlapping portion 23 toward the position that is disengaged from the overlapping portion 23 to the side of the cutting blade housing by the pressing surface 43b of the side end side portion 43, The grass after passing through the portion 43 is pressed from above by the bottom plate 46 so as to maintain the lying posture pressed by the lateral end side portion 43.

As shown in FIGS. 4 and 5, the cutting blade housing 11 includes a rear baffle 50 provided between the cutting blade housing rear portions of the pair of rotation regions 13LA and 13RA inside the cutting blade housing.
FIG. 5 shows a perspective structure of the rear baffle 50. FIG. 8 shows a longitudinal sectional structure of the rear baffle 50. FIG. 10 is a plan view of the rear baffle 50. FIG. 11 is a perspective view of the rear baffle 50. FIG. 12 is a cross-sectional plan view of the rear baffle 50. As shown in these drawings, the rear baffle 50 includes a rear straight line via a mounting bracket 51 connected to the inside of the rear baffle 50 and a connecting bolt 52 that connects the mounting bracket 51 to the rear straight wall portion 18b. The upper baffle portion 53 is located on the upper end side of the cutting blade housing so that the upper end is positioned at the same arrangement height as the inner surface of the top plate 16, and the cutting blade housing 11 has a structure connected to the wall portion 18 b. A lower baffle portion 54 positioned on the lower end side of the cutting blade housing so that the lower end is positioned at the same arrangement height as the lower end, and an air passage 55 provided between the lower baffle portion 54 and the upper baffle portion 53. Yes.

  The upper baffle portion 53 includes a first curved guide surface 53a that faces the cutting chamber 20L that does not include the cut grass discharge port 14, and a second curved guide surface 53b that faces the cutting chamber 20R that includes the cut grass discharge port 14. I have. The first curved guide surface 53a is a curved surface that guides the cut grass so that the cut grass circulates along the outer periphery of the rotation area 13LA of the cut chamber 20L and that the cut grass descends from the upper portion to the lower portion of the cut chamber 20L. It has become. The second curved guide surface 53b is a curved surface that flows and guides the cut grass so that it circulates along the outer periphery of the rotation region 13RA of the cut chamber 20R and descends from the upper portion to the lower portion of the cut chamber 20R. It has become. The tip 53c of the upper baffle 53 is deeper than the tip 54c of the lower baffle 54 inwardly in the cutting blade housing front-rear direction.

  The lower baffle portion 54 includes a first curved guide surface 54a that faces the cutting chamber 20L that does not include the cut grass discharge port 14, and a second curved guide surface 54b that faces the cutting chamber 20R that includes the cut grass discharge port 14. I have. The first curved guide surface 54a is a curved surface that flows and guides the wind from the rotary mowing blade 13L to circulate in the mowing chamber 20L. The second curved guide surface 54b is a curved surface that flows and guides the wind from the rotary mowing blade 13R to circulate in the mowing chamber 20R.

  The air passage 55 is formed by a connecting portion 56 that connects the lower baffle portion 54 and the upper baffle portion 53 of the rear baffle 50, and is connected to the wind generated by the wind-up blades 25 of the rotary mowing blade 13 </ b> L. Along the outer surface 56a of the portion 56, it passes between the lower baffle portion 54 and the upper baffle portion 53, flows into the cutting chamber 20R, and generates a wind that merges with the wind from the rotary cutting blade 13R. The outer side surface 56a guides the flow from the rotary mowing blade 13L so as to flow in a direction in which it easily flows into the mowing chamber 20R.

  As shown in FIGS. 6 and 7, the cutting blade housing 11 includes a holder cover 60 that covers the bearing holders 21. The holder cover 60 is configured in a cylindrical shape so as to cover the entire circumference of the bearing holder 21, and is bolted to the top plate 16 by a connecting flange portion 61 provided on the upper end side of the holder cover 60. The holder cover 60 includes a concave curved guide surface 62 that is continuous with the connecting flange portion 61. The curved guide surface 62 is cut by the rotary cutting blades 13L and 13R, and the cut grass that has risen to the upper portions of the cutting chambers 20L and 20R and has flowed toward the shaft core P is moved along the holder cover 60 in the cutting chambers 20L and 20R. Guide the flow down to the center.

That is, the mower 10 inputs the output of the engine 7 to the cutting blade drive mechanism 30 through the transmission belt 8, and the cutting blade drive mechanism 30 moves one rotary cutting blade 13 </ b> L in the rotational direction A around the axis P and the other. The rotary mowing blade 13R is rotationally driven around the axis P in the rotation direction B, and mowing is performed by the cutting blades 24 of the rotary mowing blades 13L and 13R. The grass which is going to enter the overlapping portion 23 is pressed by the pressing surface 43b of the lateral one end side portion 43 of the front baffle 40 toward a position off the lateral edge side of the cutting blade housing from the overlapping portion 23. The grass that has passed through the base plate 46 is maintained in the lying posture by the pressing operation of the lateral end side portion 43 by the pressing operation from above with the bottom plate 46, and the grass is cut while suppressing the entry of the grass into the overlapping portion 23. When mowing the grass in this way, wind is generated by the wind-up blades 25 of the rotary mowing blades 13L and 13R.
When the cut grass discharge port 14 is opened, the wind generated by the rotary cutting blade 13R is used to cause the rear arc wall 18a, the second curved guide surface 54b of the lower baffle 54 in the rear baffle 50, and the other lateral end of the front baffle 40. The flow is guided to the cut grass discharge port 14 by the flow guide by the side portion 44 and the front curved wall portion 17a, and the wind generated by the rotary cutting blade 13L is caused to flow into the cutting chamber 20R by the air passage 55 of the rear baffle 50, and the rotary cutting blade 13R. The air is combined with the wind from the air and flows to the cut grass outlet 14. Thereby, the cut grass from each rotary mowing blade 13L, 13R is conveyed to the cut grass discharge port 14 by the wind from each rotary mowing blade 13L, 13R, and discharged from the cut grass discharge port 14 to the lateral outer side of the mower 10. . That is, a side discharge operation is performed.
When the cut grass discharge port 14 is closed by the lid body 26, the wind generated by the rotary cutting blade 13L is caused to cause the side end portion 43 of the front baffle 40, the front arc wall portion 17a, the horizontal wall 19, and the rear arc wall portion. 18a and a flow guide by the first curved guide surface 54a of the lower baffle portion 54 in the rear baffle 50 circulates in the cutting chamber 20L, and this wind and the first curved guide surface 54a of the upper baffle portion 53 in the rear baffle 50 The cut grass is circulated in the cutting chamber 20L so as to be easily cut by the rotary cutting blade 13L by the flow guide, and the cut grass is shredded by the rotary cutting blade 13L. On the other hand, the wind generated by the rotary cutting blade 13 </ b> R causes the lower side baffle of the front baffle 40, the other end side portion 44 of the front baffle 40, the front arc wall portion 17 a, the inner surface of the lid body 16, the rear arc wall portion 18 a, The cutting grass is rotated in the cutting chamber 20L by the flow guide by the second curved guide surface 54b of the portion 54, and the cut grass is rotated by this wind and the flow guide by the second curved guide surface 53b of the upper baffle portion 53 in the rear baffle 50. The cutting room 20R is circulated so as to be easily cut by the blade 13R, and the cut grass is shredded by the rotary cutting blade 13R. Thereby, the cut grass by the rotary cutting blades 13L and 13R is shredded by the rotary cutting blades 13L and 13R, and discharged from the bottom of the cutting chambers 20L and 20R of the cutting blade housing 11 to the lower side of the mower 10. That is, mulching work is performed.

[Another Example]
The present invention can be applied to a mower having three or more rotary mowing blades in addition to a mower having two rotary mowing blades 13L and 13R as in the above-described embodiment. In this case, a pair of adjacent rotary cutting blades among the plurality of rotary cutting blades corresponds to a pair of rotary cutting blades referred to in the present invention.

Overall side view of riding mower Top view of Moore's mulching work Top view of Moore's discharge operation Top view of the mower with the top plate removed Perspective view of the cutting blade housing Mohr's longitudinal front view Mohr's profile side view Vertical side view of the cutting blade housing Cross section of front baffle Rear baffle top view Rear baffle perspective view Cross section of rear baffle

11 Mowing blade housings 13L, 13R Rotating mowing blades 13LA, 13RA Rotating range
14 Cut grass outlet
17 Front wall
17a Front arc wall
17b Front straight wall
18 Rear wall
18a Rear arc wall
18b Rear straight wall portion 23 Superposition portion 40 Front baffle 43 Front baffle side end side portion 44 Front baffle side other end side portion 45 Boundary 46 Bottom plate
50 Rear baffle P Rotary shaft center of rotary blade

Claims (3)

A pair of rotary cutting blades that can be driven and rotated around the vertical axis of the cutting blade housing are arranged side by side in the horizontal direction of the cutting blade housing, and the pair of rotary cuttings in the longitudinal direction of the cutting blade housing. A mower provided with a front baffle formed in front of the pair of rotary mowing blades so that a superposed portion where the rotation areas of the blades overlap is formed and guided to the wind from the pair of rotary mowing blades,
The front wall of the cutting blade housing is a pair of front arc wall portions along the outer periphery of the front portion of the rotation area of the pair of rotary cutting blades, and a virtual line that is a common tangent to the pair of front arc wall portions. And a straight front straight wall portion that connects the pair of front arc wall portions and is located in a state of entering the rear side,
The front baffle includes a lateral one end side facing the rotation area of one rotary cutting blade of the pair of rotary cutting blades of the front baffle, and a lateral other end side part facing the rotation area of the other rotary cutting blade. The boundary of the front baffle is positioned away from the overlapping portion on the side of the cutting blade housing, and the front end of the baffle is directed toward the position where the grass is removed from the overlapping portion on the side of the cutting blade housing. And press to configure ,
The front baffle, the front straight wall portion detachably mounted Oh Ru mower in the front wall of the cutting blade housing. The rear wall of the cutting blade housing is a virtual line that is a common tangent to each of the pair of rear arc wall portions along the outer periphery of the rear portion of the rotation area of the pair of rotary cutting blades and the pair of rear arc wall portions. And a straight rear straight wall portion that connects the pair of rear arc wall portions and is located in a state of entering into the front side,
The mower according to claim 1 , wherein a rear baffle positioned behind the pair of rotary cutting blades is detachably attached to the rear straight wall portion of the rear wall of the cutting blade housing . Side discharge operation in which a cut grass discharge port that can be freely opened and closed is provided at a lateral end portion of the cutting blade housing, and the cut grass discharge port is opened to release the cut grass from the lateral end portion of the cutting blade housing to the mower lateral outer side. 2. A configuration and a mulching work mode in which the cut grass discharge port is closed and the cut grass from each rotary cutting blade is discharged from the bottom of the cutting blade housing to the lower side of the mower can be realized. 2. Mohr according to 2.

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