JP5174053B2 - Side discharge mower - Google Patents

Description

  In the present invention, a plurality of rotary blades that are driven to rotate about the longitudinal axis are arranged in parallel inside the mower deck, and the rear side of the mower deck is along the rear side of the rotation locus drawn by the tip of each rotary blade. A side discharge mower that is provided with a vacuum plate formed as described above, and that forms a mowed grass discharge port at the left and right ends of the mower deck, and the mowed grass flows and flows toward the discharge port on the front side of each rotary blade. It is about.

  In this type of mower, the wind from the rotating blade located on the upper side in the mowing flow direction of the pair of adjacent rotating blades arranged inside the mower deck merges with the wind from the other rotating blade located on the lower side. However, it is configured to flow toward the discharge port through the rotation region of the lower rotation blade. The grass cut by the rotating blades rides on the wind generated by the rotating blades, flows toward the discharge port on the front side of each rotating blade, and is discharged (see Patent Document 1). The vacuum plate formed along the rear side of the rotation locus drawn by the tip of each rotary blade has a shape in which arcs concentric with the rotation center (vertical axis) of each rotary blade are arranged side by side. In the vicinity of the boundary between the arcs, a substantially symmetrical mountain shape is formed.

Japanese Patent Laying-Open No. 2008-72960 (see 50, 51, 52 in FIGS. 3 and 6)

The crest-shaped portion of the vacuum plate is located between a pair of adjacent rotating blades, and a part of the wind from the lower-side rotating blade is part of the upper-side rotating blade along the tangential direction of the tip portion of the crest-shaped portion. It tries to flow to the rotation area side. For this reason, there has been a problem that the turbulent flow is generated by colliding with the wind from the rotating blade on the upper side, or the wind escapes backward due to the reverse flow of the wind.
When the wind blows worse, the wind speed decreases, so that mowing grass stays and it becomes easy to form a lump. As a result, the release property of the cut grass is deteriorated, resulting in an increase in horsepower consumption, and the lump of cut grass is scattered in the cut area and the appearance is also deteriorated.
Accordingly, it is an object of the present invention to provide a side discharge mower in which mowing grass is discharged smoothly while suppressing turbulence and backflow of wind inside the mower deck.

  In the first characteristic configuration according to the present invention, a plurality of rotary blades that are driven to rotate about a longitudinal axis are arranged in parallel inside the mower deck, and a rotation drawn by the tip of each rotary blade on the inner rear side of the mower deck. A vacuum plate formed along the rear side of the trajectory is provided, and a mowed grass discharge port is formed at one end of the left and right sides of the mower deck so that the mowed grass flows on the front side of each rotary blade toward the discharge port. A side discharge mower that is discharged, and guides forward from a portion of the vacuum plate positioned between a pair of adjacent rotating blades along the rotational direction of the lower rotating blade positioned on the discharge port side. And the guide portion is moved so as to be curved toward the longitudinal axis of the lower-side rotary blade and enter the rotation locus of the lower-side rotary blade in plan view. It lies in that is arranged above the side rotating blades.

[Action and effect]
According to this configuration, since the guide part enters the rotation locus of the lower-side rotary blade, the wind from the lower-side rotary blade is likely to flow from the vacuum plate along the guide part to the rotation area side of the lower-side rotary blade. . In other words, it is difficult for the wind from the lower-side rotary blade to flow to the rotation region side of the upper-side rotary blade adjacent to the lower-side rotary blade. As a result, the collision between the wind from the upper rotating blade and the wind from the lower rotating blade is unlikely to occur, and the occurrence of turbulence and backflow of the wind is suppressed, so there is no deterioration in the wind passage, and the grass will form a lump. It is discharged smoothly without doing.

  According to a second characteristic configuration of the present invention, an arcuate lower-side guide portion that follows the rotation trajectory of the lower-side rotary blade is disposed near the extension line extending forward from the end portion of the guide portion. It exists in the point provided in the front side of the said lower side rotation blade so that the edge part on the opposite side to the said discharge port may be located.

[Action and effect]
According to this configuration, the wind that has flowed forward from the end portion of the guide portion by the lower-side rotating blade reaches the vicinity of the end portion on the opposite side of the discharge port of the lower-side guide portion, and the lower-side guide portion as it is. Therefore, it is easy to flow into the rotation area of the lower rotation blade. As a result, the wind from the lower rotating blade is further prevented from flowing to the rotating region side of the upper rotating blade, and collision with the wind from the upper rotating blade is avoided, so turbulence and backflow are generated. Furthermore, it is suppressed more effectively. Note that the extending direction of the guide portion does not necessarily have to be directed to the end portion of the lower guide portion. If the wind guided by the guide portion reaches the vicinity of the end portion of the lower guide portion, Can be secured. That is, the above-mentioned “the end opposite to the discharge port of the lower guide portion is located in the vicinity of the extended line of the guide portion” means that the end portion of the lower guide portion is guided by the wind guided by the guide portion. It is meant to be arranged at a position that ensures a smooth flow, and the position can be appropriately changed within a range in which a smooth wind flow is ensured.

  A third characteristic configuration according to the present invention is the arcuate upper side along the rotation trajectory of the upper rotary blade on the front side of the upper rotary blade opposite to the discharge port in the pair of adjacent rotary blades. An extension line from the discharge port side end of the upper guide portion to the discharge port side is formed between a longitudinal axis of the lower rotation blade and a front end of the rotation region of the lower rotation blade. The upper guide portion is configured so as to be positioned between them.

[Action and effect]
According to this configuration, the wind from the upper rotating blade can easily flow along the upper guiding portion to the space between the longitudinal axis of the lower rotating blade and the front end of the rotating region of the lower rotating blade. In this case, the wind that flows into the rotation area of the lower rotation blade from the upper guide portion by the upper rotation blade joins at an acute angle to the wind generated by the rotation of the lower rotation blade, so the upper rotation blade And the wind by the lower rotating blade are smoothly merged, the wind passage is improved and the cut grass is efficiently discharged.

  According to a fourth aspect of the present invention, there is provided an extended guide portion extending from the tip of the guide portion to the inside of the rotation locus of the upper-side rotary blade and to the front side of the longitudinal axis of the upper-side rotary blade. It is in the point to prepare.

[Action and effect]
According to this configuration, a part of the wind generated by the upper rotating blade hits the extension guide part, and along the extension guide part, in the rotation region of the lower hand rotating blade (front side of the longitudinal axis of the lower rotating blade). Inflow. As a result, the wind from the extended guide part by the upper rotating blade joins at an acute angle with the wind by the lower rotating blade flowing along the guide part, the wind passage is improved and the cut grass is discharged more efficiently. .

Overall side view of riding mower Overall plan view of a riding mower Moor's top view Moor's bottom view Mohr's profile side view Perspective view of the moor deck viewed from the bottom

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Riding mower)
As shown in FIGS. 1 and 2, the riding mower includes a self-propelled vehicle body having a pair of left and right front wheels 1, 1 and a pair of left and right rear wheels 2, 2, and a body frame 3 of the self-propelled vehicle body. The side discharge mower 20 according to the present invention (hereinafter simply referred to as the mower 20) mounted between the front wheel 1 and the rear wheel 2 via the link mechanism 4 is provided.

  This riding mower performs mowing and lawn mowing work. That is, when the lifting cylinder 14 connected to the support shaft 4d that supports the pair of left and right rear swing links 4b, 4b of the link mechanism 4 so as to be swingable integrally is operated, the link mechanism 4 is moved by the lifting cylinder 14 to the vehicle body frame. 3, the mower 20 is moved up and down into a lowering working state in which the gauge wheel 25 is substantially grounded to the ground and a non-working state in which the gauge wheel 25 is lifted from the ground.

  The link mechanism 4 is connected across the vehicle body frame 3 and the front end side of the mower deck 21 of the mower 20, and a pair of left and right front swing links 4a, 4a that connect the front end side of the mower 20 to the vehicle body frame 3 so as to be movable up and down. A pair of left and right rear swing links 4b, 4b that are connected over the vehicle body frame 3 and the rear end side of the mower deck 21 and connect the rear end side of the mower 20 to the vehicle body frame 3 so as to be movable up and down. 1 includes an interlocking link 4c connected over the front swing link 4a and the rear swing link 4b.

  When the mower 20 is in the descending work state and the self-propelled vehicle body is driven, the mower 20 performs grass and lawn mowing processing with the three rotating blades 22L, 22C, and 22R located inside the mower deck 21, and each mowing grass is processed. The inside of the mower deck 21 is conveyed by the wind generated by the rotation of the rotating blades 22L, 22C, and 22R to the discharge port 23 positioned at the right end of the mower deck 21, and is guided by the discharge guide 24 from the discharge port 23 while the outer side of the self-propelled vehicle body. To release.

  The self-propelled vehicle body includes a pair of left and right front wheels 1 and 1 and a pair of left and right rear wheels 2 and 2, a driving unit having an engine 5 provided at the rear of the vehicle body, a driver seat 6 and a pair of left and right control levers. 7 and 7, a fall protection frame 8 positioned near the rear side of the driver seat 6, a transmission 9 that supports the left and right rear wheels 2, 2, and a front of the transmission 9. The rotary shaft 11 transmits the driving force of the power take-off shaft 10 to the rotary blade drive mechanism 30 of the mower 20.

  The left and right front wheels 1 are supported on the end of a front wheel support frame 12 connected to the front portion of the vehicle body frame 3 via a front wheel support fork 13 so as to be freely rotatable around a vertical axis. The left and right front wheels 1 swing freely with respect to the front wheel support frame 12 together with the front wheel support fork 13. The left and right rear wheels 2, 2 are driven separately by a pair of hydrostatic continuously variable transmissions (not shown) provided in the transmission device 9, and are paired by a pair of left and right control levers 7, 7. The gears are shifted to the forward side and the reverse side by the respective shift operations of the transmission, and stopped.

  As shown in FIG. 3, the mower 20 includes a pair of grounding rollers 61, 61, 62, 62 provided side by side in the lateral direction of the mower deck 21 on the front side and the rear side of the central portion in the lateral direction of the mower deck 21. Yes.

  The pair of left and right grounding rollers 61, 61 on the front side are supported by a pair of left and right support members 63 connected to the front vertical wall 21b of the mower deck 21 via a support shaft 64 so as to be freely rotatable. When there is an obstacle such as a raised portion on the ground, the pair of left and right grounding rollers 61, 61 on the front side get on the obstacle and support the ground so that the front end side of the mower deck 21 does not thrust into the obstacle. Overcoming.

  The pair of left and right grounding rollers 62, 62 on the rear side are formed at portions protruding rearward from the vent holes 33 (see FIG. 6) of the pair of left and right support members 60, 60 connected across the vacuum plate 50 and the rear vertical wall 21c. It is supported through a support shaft 65 so as to be freely rotatable. When there is an obstacle such as a raised portion on the ground, the pair of left and right grounding rollers 62, 62 on the rear side climbs on the obstacle and supports the ground so that the rear end side of the mower deck 21 does not thrust into the obstacle. Get over obstacles. The pair of left and right grounding rollers 62, 62 are supported in an arrangement in which the entire grounding roller 62 protrudes rearward from the air vent 33 so that the air vent 33 does not easily obstruct the airflow.

(Moore)
As shown in FIGS. 3 and 4, the mower 20 includes a moor deck 21, three rotating blades 22 </ b> R, 22 </ b> C, 22 </ b> L, and a gauge wheel 25, and each rotating blade 22 </ b> R, 22 </ b> C, A baffle plate 40 provided on the front side of 22L, a vacuum plate 50 formed along the rear side of the rotation locus drawn by the tips of the rotary blades 22R, 22C, and 22L on the inner rear side of the moor deck 21, and the mower deck 21 And a discharge port 23 formed at the right end.

  The mower deck 21 includes a top plate 21a, a front vertical wall 21b that extends downward from the front edge of the top plate 21a, and a lower edge of the mower deck 21 that extends downward from the rear edge of the top plate 21a. It is constituted by a vertical wall 21c and a horizontal vertical wall 21d extending downward from the mower deck 21 from the horizontal end of the top plate 21a, and has a container shape opened downward of the self-propelled aircraft.

  The discharge port 23 of the mower deck 21 is formed by the right end of the top plate 21a, the right end of the front vertical wall 21b, and the end of the arc portion 50R of the vacuum plate 50.

  As shown in FIG. 6, the rear vertical wall 21 c includes a vent 33 provided in the central portion thereof, and second vents 34 and 34 provided on both sides of the vent 33.

  As shown in FIGS. 3 and 4, the three rotating blades 22 </ b> R, 22 </ b> C, and 22 </ b> L are arranged side by side in the mower deck 21 in the lateral direction. Of the three rotary blades 22R, 22C, 22L, the rotary blade 22C (lower rotary blade) located in the center of the mower deck 21 in the lateral direction is triangularly arranged in plan view so as to be slightly displaced forward. Is done. The rotating blade 22L (upper side rotating blade) is located farthest from the discharge port 23 and is positioned at the uppermost position in the direction of cutting grass flow. The rotating blade 22R is located closest to the discharge port 23 and is located at the lowest position in the direction of flow of grass.

  Each of the rotating blades 22R, 22C, and 22L is rotatable on the lower end portion of the drive shaft 27 that is rotatably supported on the top plate 21a of the mower deck 21 via a support member 26 (see FIG. 5) that is a bearing support case. It is supported. Thereby, each of the rotary blades 22R, 22C, 22L is rotationally driven together with the drive shaft 27 around the vertical axis XR, XC, XL in the vertical direction of the mower deck 21 of the drive shaft 27. Each of the rotating blades 22R, 22C, and 22L includes a cutting blade 28 provided at both ends thereof, and a wind-up blade 29 provided on the back side of each cutting blade 28.

  The baffle plate 40 is connected to the mower deck 21 by mounting bolts 45 connected to a plurality of locations in the longitudinal direction of the baffle plate 40. The baffle plate 40 is composed of two divided strip plates that are arranged in the longitudinal direction of the baffle plate 40 and connected by connecting bolts 46.

The vacuum plate 50 has a shape in which arc portions 50R, 50C, 50L concentric with the longitudinal axes XR, XC, XL of the rotary blades 22R, 22C, 22L are arranged in parallel. In the vicinity of the boundary, a first mountain-shaped portion 51 and a second mountain-shaped portion 52 that are substantially symmetrical are formed.
The first mountain-shaped portion 51 is located between the adjacent rotary blades 22L and 22C, and the second mountain-shaped portion 52 is located between the adjacent rotary blades 22R and 22C.

  As shown in FIGS. 4, 5, and 6, the first guide portion 53 a extends forward from the tip of the first mountain-shaped portion 51. For example, the first guide portion 53a is bent from the tip of the first mountain-shaped portion 51 so as to be curved with the same curvature and enter the rotation locus of the rotary blade 22C in plan view on the longitudinal axis XC side of the rotary blade 22C. It extends forward along the rotational direction of 22C. Specifically, as shown in FIG. 4, in a plan view, the first guide portion 53a has a straight line M1 connecting the vertical axis XL of the rotary blade 22L and the vertical axis XC of the rotary blade 22C, and the tip of the rotary blade 22C. Near the intersection P1 with the rotation locus drawn by the crossing from the outside to the inside of the rotation locus at the tip of the rotary blade 22C, and the distance from the rotation locus at the tip of the rotation blade 22C increases from the intersection P1 to the front side. It is getting in gradually. As shown in FIG. 5, the first guide portion 53 a is disposed above the rotating blade 22 </ b> C so as to hang down from the top plate 21 a of the moor deck 21.

  As shown in FIGS. 4, 5, and 6, a bending portion 57 that curves toward the rotating blade 22 </ b> C is provided at the tip of the first guide portion 53 a, and the first extension guide portion 54 extends from the bending portion 57. The rotating blade 22L extends to the front side of the longitudinal axis XL in the rotating region 22LA. If the end of the first extension guide 54 extends to a position slightly to the right of the longitudinal axis passing through the longitudinal axis XL, the wind from the rotating blade 22L can easily flow toward the rotating region 22CA. is there.

  As shown in FIG.5 and FIG.6, the lower side of the 1st extension guide part 54 and the lower side of the curved part 57 are located in a position higher than the lower side of the 1st guide part 53a. The tip end portion of the first extension guide portion 54 is provided with an obliquely upward inclination, and an obliquely upward inclination is also provided between the lower side of the first guide portion 53 a and the lower side of the curved portion 57. As shown in FIG. 4, an extension line L3 extending from the first extension guide portion 54 to the rotary blade 22C side in a plan view is located slightly in front of the longitudinal axis XC of the rotary blade 22C, and the second extension guide portion Crosses the middle part of 55.

  Further, the second guide portion 53 b extends forward from the tip of the second mountain-shaped portion 52. The second guide portion 53b is configured in the same shape as the first guide portion 53a. For example, the second guide portion 53b is curved with the same curvature on the longitudinal axis XR side of the rotary blade 22R and enters the rotation locus of the rotary blade 22R in plan view. As described above, it extends forward from the tip of the second mountain-shaped portion 52 along the rotational direction of the rotary blade 22R. Specifically, as shown in FIG. 4, the second guide portion 53b in the plan view includes a straight line M2 connecting the longitudinal axis XR of the rotating blade 22R and the longitudinal axis XC of the rotating blade 22C, and the tip of the rotating blade 22R. Near the intersection P2 with the rotation locus drawn by the crossing from the outside to the inside of the rotation locus at the tip of the rotary blade 22R, and the distance from the rotation locus at the tip of the rotation blade 22R increases as it moves forward from the intersection P2. It is getting in gradually. In this case, the rotating blade 22C becomes the upper side rotating blade, and the rotating blade 22R becomes the lower side rotating blade.

  A bending portion 58 that curves toward the rotary blade 22R is provided at the tip of the second guide portion 53b, and the second extension guide portion 55 extends from the bending portion 58 to the longitudinal axis XC within the rotation region 22CA of the rotary blade 22C. Is extended to a position on the right side of the front-rear axis passing through the longitudinal axis XC.

  As shown in FIG. 6, the lower side of the second extended guide part 55 and the lower side of the curved part 58 are the same as the first extended guide part 54, the curved part 57, and the first guide part 53a. It is located at a position higher than the lower side of 53b. The tip end portion of the second extension guide portion 55 is provided with an obliquely upward slope, and the obliquely upward slope is also provided between the lower side of the second guide portion 53 b and the lower side of the curved portion 58. As shown in FIG. 4, the extension line L4 extending from the second extension guide portion 55 toward the rotary blade 22R is positioned slightly in front of the longitudinal axis XR of the rotary blade 22R.

  As shown in FIG. 4, a third extension guide part 56 is provided at the right end of the arc part 50R of the vacuum plate 50, and the third extension guide part 56 rotates the rotary blade 22R from the right end of the arc part 50R. Within the region 22RA, it extends to the position on the front side of the longitudinal axis XR and on the right side of the longitudinal axis passing through the longitudinal axis XR.

  The baffle plate 40 has an arcuate upper-side guide portion 40L disposed in front of the rotation region 22LA of the rotary blade 22L so as to follow the rotation locus of the rotary blade 22L, and a rotation region along the rotation locus of the rotary blade 22C. An arc-shaped first lower guide part 40C arranged in front of 22CA and a second lower guide part 40R arranged in front of the rotation area 22RA of the rotary blade 22R and extending toward the discharge port 23. Has been.

  In addition, between the upper side guide part 40L and the 1st lower side guide part 40C, the connection part 40S of the reverse arc shape with these guide parts is provided. An inflection point P3 exists near the boundary between the upper guide portion 40L and the connecting portion 40S, and an inflection point P4 exists near the boundary between the first lower guide portion 40C and the connecting portion 40S.

  The upper guide portion 40L has an arc shape along the rotation locus of the rotary blade 22L, has a radius (curvature) larger than the radius of the rotary blade 22L, and is slightly separated from the rotation region 22LA of the rotary blade 22L. And arranged on the front side of the rotating blade 22L. An extension line L1 of the end of the upper guide portion 40L on the discharge port 23 side to the discharge port 23 side, that is, a tangent at the inflection point P3, is the vertical axis XC of the rotary blade 22C and the rotation region 22CA of the rotary blade 22C. It is located between the front end and is in contact with the tip end portion of the second extension guide portion 55.

  The first lower guide part 40C has an arc shape along the rotation locus of the rotary blade 22C, and is disposed on the front side of the rotary blade 22C. At this time, as shown in FIG. 4, the extension line L2 from the end of the first guide portion 53a to the front, that is, the tangent to the front at the end of the first guide portion 53a intersects the connecting portion 40S, In the vicinity of the intersection P5, the end (inflection point P4) on the opposite side of the discharge port 23 of the first lower guide 40C is located.

  The driving force from the engine 5 is transmitted to the rotating blade driving mechanism 30 by the rotating shaft 11. The driving force transmitted to the rotary blade drive mechanism 30 drives the drive shaft 27 of the rotary blade 22C, and the rotary blade 22R, The drive shafts 27 and 27 of 22L are driven. Thereby, each rotary blade 22R, 22C, 22L is rotationally driven in the rotation direction A around the respective longitudinal axis XL, XC, XR.

  The rotating blades 22R and 22L cause the air outside the mower deck 21 to flow from the front vertical wall 21b, the horizontal vertical wall 21d of the mower deck 21 and the vacuum plate 50 from below the vacuum region 50 by the wind action of the wind blades 29, respectively. The air flow is generated by introducing into 22 LA, and the cutting blade 28 cuts the grass and grass while standing up by the air flow. The rotating blade 22C causes air outside the mower deck 21 to flow from the lower side of the front vertical wall 21b of the mower deck 21 to the lower side of the rear vertical wall 21c, the air vent 33, and the second air vents. An air flow is generated from the opening 34 through the lower part of the vacuum plate 50 through the mouth 34 to generate an air flow, and the cutting blade 28 cuts the grass and grass while standing by the air flow.

  The cut grass cut by the rotary blades 22R, 22C, and 22L is guided to the vacuum plate 50 and the baffle plate 40 by the wind generated by the wind-up blades 29 of the rotary blades 22R, 22C, and 22L. Is discharged to the lateral one end side where the discharge port 23 is located, and discharged from the discharge port 23 to the lateral outer side of the mower deck 21.

(Wind flow in the moor deck)
As shown in FIG. 4, the wind generated in the rotation region 22LA by the rotation of the wind-up blade 29 of the rotary blade 22L is guided by the upper guide portion 40L and the first extension guide portion 54 as indicated by the white arrows. Thus, it flows toward the rotation region 22CA of the rotary blade 22C.

  An extension line L1 of the end (inflection point P3) on the discharge port 23 side of the upper guide portion 40L is located between the longitudinal axis XC of the rotating blade 22C and the front end of the rotating region 22CA of the rotating blade 22C.

  For this reason, the wind by the rotating blade 22L is likely to flow along the upper guide part 40L to the space between the longitudinal axis XC of the rotating blade 22C and the front end of the rotating region 22CA of the rotating blade 22C. In this case, the wind that flows into the rotation area 22CA of the rotary blade 22C from the upper guide portion 40L by the rotary blade 22L joins at an acute angle with the wind generated by the rotation of the rotary blade 22C. Then, the merging with the wind by the rotating blade 22C is performed smoothly, the wind passage is improved, and the cut grass is efficiently discharged.

  Further, since the first guide portion 53a enters the rotation locus of the rotary blade 22C, the wind generated in the rotation region 22CA due to the rotation of the wind-up blades 29 of the rotary blade 22C is generated from the arc portion 50C of the vacuum plate 50 from the first arc portion 50C. It becomes easy to flow along the guide part 53a to the rotation region 22CA side of the rotary blade 22C. In other words, the wind from the rotating blade 22C is difficult to flow to the rotating region 22LA side of the rotating blade 22L adjacent to the rotating blade 22C.

  Therefore, it is difficult for the wind generated by the rotating blade 22L and the wind generated by the rotating blade 22C to collide with each other, and the occurrence of wind turbulence and backflow can be suppressed. It is discharged smoothly.

  Further, a part of the wind generated by the rotating blade 22L hits the first extension guide portion 54, and along the first extension guide portion 54, the rotation region 22CA of the rotation blade 22C (front side of the longitudinal axis XC of the rotation blade 22C). Flow into. As a result, the wind from the first extended guide portion 54 by the rotating blade 22L merges at an acute angle with the wind by the rotating blade 22C flowing along the first guide portion 53a, so that the wind passage is improved and the mowing grass is more efficient. Well discharged.

  The first lower guide part 40C and the second extension guide part 55 are provided with the wind generated by the rotation of the wind-up blades 29 and 29 of the rotary blades 22L and 22C, and the cutting blades 28 and 22C of the rotary blades 22L and 22C, respectively. The mowed grass cut by 28 is guided to the space between the second lower guide part 40R and the longitudinal axis XR of the rotary blade 22R.

  The wind that flows forward from the end portion of the first guide portion 53a by the rotating blade 22C reaches the end portion (the inflection point P4) opposite to the discharge port 23 of the first lower side guide portion 40C. Since it is guided to the discharge port 23 side along the first lower guide part 40C as it is, it easily flows into the rotation area 22CA of the rotary blade 22C. As a result, the wind generated by the rotating blade 22C is further prevented from flowing toward the rotating region 22LA of the rotating blade 22L, and collision with the wind caused by the rotating blade 22L is avoided. Effectively suppressed.

  Further, part of the wind generated by the rotating blade 22C hits the second extension guide portion 55, and along the second extension guide portion 55, the rotation region 22RA of the rotation blade 22R (front side of the longitudinal axis XR of the rotation blade 22R). Flow into. Thereby, the wind by the rotating blade 22R flowing along the second guide portion 53b merges at an acute angle with the wind from the second extended guide portion 55 by the rotating blade 22C, and the wind passage is improved and the grass is more efficient. Well discharged.

  The second lower guide part 40R and the third extension guide part 56 are provided with the wind generated by the rotation of the wind-up blades 29, 29, 29 of the rotary blades 22L, 22C, 22L and the rotary blades 22L, 22C, 22L. The cut grass cut by the cutting blades 28, 28, 28 is guided to the discharge port 23.

  Note that the wind that flows forward from the end portion of the second guide portion 53b by the rotating blade 22R reaches the second lower guide portion 40R and easily flows to the discharge port 23 by the second lower guide portion 40R. Part of the wind generated by the rotating blade 22 </ b> R hits the third extension guide portion 56 and is discharged from the discharge port 23 along the third extension guide portion 56.

[Another embodiment]
(1) The first and second guide portions 53a and 53b in the above-described embodiment are not provided at the tips of the first and second mountain-shaped portions 51 and 52, but the first and second mountain-shaped portions 51 and 52 You may comprise so that it may extend ahead from the part of the vacuum plate 50 (arc part 50R, 50C, 50L) of a little rear side (paper surface lower side of FIG. 4) from the front-end | tip.
(2) The present invention can be applied not only to a mower having three rotating blades as in the above embodiment, but also to a mower having two rotating blades and a mower having four or more rotating blades. .

  The present invention can be applied not only to a riding mower that supports a mower between front and rear wheels, but also to a riding mower that includes a mower on the front side of the front wheel.

20 Moore 21 Moore deck 22L Rotating blade (Upper rotating blade)
22C rotating blade (lower side rotating blade)
22CA, 22LA Rotating region 23 Discharge port 40 Baffle plate 40C Lower side guide part 40L Upper side guide part 50 Vacuum plate 51 First mountain-shaped part (part)
53a 1st guide part (guide part)
54 First Extension Guide (Extension Guide)
XL, XC Vertical axis L1, L2 Extension line

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 are formed on the rear side inside the mower deck so as to follow the rear side of the rotation locus drawn by the tip of each rotating blade. A side discharge mower in which a vacuum plate is provided, a mowed grass discharge port is formed at one of the left and right ends of the mower deck, and the mowed grass flows and is discharged toward the discharge port on the front side of each rotary blade,
From the portion of the vacuum plate positioned between a pair of adjacent rotating blades, a guide portion extends forward along the rotation direction of the lower-side rotating blade positioned on the discharge port side,
A side discharge mower in which the guide portion is disposed above the lower-side rotating blade so as to bend toward the longitudinal axis of the lower-side rotating blade and enter the rotation locus of the lower-side rotating blade in plan view.   An arcuate lower-side guide portion that follows the rotation trajectory of the lower-side rotation blade, and an end portion on the opposite side of the lower-side guide portion from the discharge port in the vicinity of an extension line from the end portion of the guide portion to the front. 2. The side discharge mower according to claim 1, wherein the side discharge mower is provided on a front side of the lower-side rotary blade such that the lower discharge blade is positioned. On the front side of the upper-side rotary blade opposite to the discharge port in the pair of adjacent rotary blades, an arc-shaped upper-side guide portion along the rotation locus of the upper-side rotary blade is provided,
An extension line from the end on the discharge port side to the discharge port side of the upper guide portion is located between the longitudinal axis of the lower rotation blade and the front end of the rotation region of the lower rotation blade. The side discharge mower according to claim 1, wherein the upper guide portion is configured as described above.   4. The side discharge mower according to claim 3, further comprising an extended guide portion that extends from a tip end of the guide portion to a front side of a longitudinal axis of the upper-side rotary blade in a rotation region of the upper-side rotary blade.

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