JP4630252B2 - Moore - Google Patents

Description

  The present invention relates to a plurality of rotary cutting blades that are positioned side by side in the horizontal direction of the cutting blade housing inside the cutting blade housing and that are rotatable around the vertical axis of the cutting blade housing, and are positioned at one end of the cutting blade housing. And a front baffle positioned in front of the rotation area of each rotary cutting blade inside the cutting blade housing so as to flow-guide the cut grass from each rotary cutting blade to the cutting grass discharge port. It relates to a mower with a plate.

  The mower described above is generated by the rotation of each rotary cutting blade, and the mowing grass cut by the rotary cutting blade is guided by the front baffle plate and flows in the cutting blade housing toward the lateral end of the cutting housing. It is conveyed by wind and discharged out of the cutting blade housing through the cut grass outlet.

  Conventionally, as this type of mower, for example, there is one shown in Patent Document 1. Patent Document 1 shows a moor deck (corresponding to a cutting blade housing), three rotating blades (corresponding to a rotating cutting blade), a cut grass discharge port, a front baffle (corresponding to a front baffle plate), It has. The front baffle consists of the rotation zone of the lowermost rotating blade (corresponding to the cutting blade side cutting blade closest to the cutting grass discharge port) in the cutting grass conveying direction and the central rotating blade (most in the cutting grass conveying direction). A plate portion located in front of the rotation area of the adjacent cutting blade adjacent to the discharge-side cutting blade. The plate portion includes a curved upper side plate portion along the rotation range of the central rotary blade, and a lower side plate portion positioned in front of the rotation range of the lowermost rotary blade. The lower plate portion includes a linear guide terminal portion near the cut grass discharge port, and a guide start end portion extending over the guide terminal portion and the curved plate portion. The guide start end portion has a corrugated shape and is located relatively close to the rotation region of the central rotary blade and the rotation region of the lowermost rotary blade.

JP 2004-41060 A (paragraphs [0027]-[0029], FIG. 6)

  In this type of mower, the wind from the adjacent cutting blade and the wind from the most exhausting side cutting blade merge between or near the rotation area of the adjacent cutting blade and the rotation area of the most exhausting side cutting blade. The combined wind is guided by the front baffle plate and flows toward the cut grass discharge port. When the above-described conventional technology related to the front baffle plate is adopted, a high-speed air flow or cutting blade housing at and near the portion where the wind from the adjacent cutting blade and the wind from the most discharge port side cutting blade merge. A strong downward wind was generated, and grass lodging sometimes occurred. For this reason, there are cases where it is difficult to obtain a good cut mark, such as insufficient cutting or uncut grass in the cut mark by the most discharge port side cutting blade or the adjacent cutting blade.

  An object of the present invention is to provide a mower that can easily avoid the above-described trouble occurrence.

The first invention includes a plurality of rotary cutting blades positioned side by side in the horizontal direction of the cutting blade housing inside the cutting blade housing and rotatable around the vertical axis of the cutting blade housing, and a lateral end portion of the cutting blade housing The mowed grass outlet and the mowed grass from each rotary cutting blade are located in front of the rotation area of each rotary mow blade inside the cutting blade housing so as to flow guide the mowed grass from each rotary mow blade to the mowed grass outlet. In moor with front baffle plate,
Of the front baffle plate, of the plurality of rotary cutting blades, the rotation area of the nearest discharge port side cutting blade closest to the cut grass discharge port, and the adjacent cutting blade adjacent to the most discharge port side cutting blade The plate portion located in front of the rotation area is configured as a bent plate portion bent in the front-rear direction of the cutting blade housing at a bending point arranged in front of the rotation area of the adjacent cutting blade,
A lower plate portion located on the lower side of the flow guide direction with respect to the bending point of the plate portion is disposed on the front side of the cutting blade housing with respect to a straight line passing through the flow guide end point of the lower plate portion and the bending point. It is.

  According to the configuration of the first aspect of the invention, the wind from the adjacent cutting blade and the wind from the most discharge port side cutting blade are between or near the rotation region of the adjacent cutting blade and the rotation region of the most discharge port side cutting blade. At this point, they are guided by the front baffle plate and flow toward the cut grass outlet. Because of the bending at the bending point of the plate part, the arrangement of the bending point, and the arrangement of the lower plate part, the size of the merging part and the width of the air path from the merging part to the cut grass discharge port are also appropriately widened and rapidly It is possible to cause the cut grass to be discharged while it is difficult for a strong air flow or a downwind to be generated, and to prevent a grassy fall caused by the wind.

  Therefore, the cut grass is discharged to the lateral outside of the cutting blade housing by the wind generated by the rotary cutting blade, but it has a good finish that is less prone to cutting shortage and uncut residue due to the lodging due to the wind of the grass. Mowing work can be performed.

  According to a second aspect of the present invention, in the configuration of the first aspect of the invention, the bending point is closer to a side where the cut grass discharge port is located with respect to a rotational axis of the adjacent cutting blade in a rotation area of the adjacent cutting blade. Is located.

  According to the structure of this 2nd invention, the length of the plate part corresponding to the adjacent cutting blade of a front baffle plate is made into an appropriate length, and the flow guide by the front baffle plate with respect to the wind from an adjacent cutting blade is performed appropriately. Can do.

  Accordingly, the cut grass is smoothly guided to the cut grass discharge port, and the cut grass can be smoothly discharged so as not to stay in the cut blade housing.

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. FIG. 2 is an overall plan view of the riding mower. As shown in these drawings, the riding mower has a self-propelled vehicle body having a pair of left and right front wheels 1 and 1 and a pair of left and right rear wheels 2 and 2, and a front wheel of a body frame 3 of the self-propelled vehicle body. 1 and a rear wheel 2 are provided with a mower 20 according to an embodiment of the present invention mounted via a link mechanism 4.

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 descending working state in which the gauge wheel 25 is in contact with the ground and a non-working state in which the gauge wheel 25 is lifted from the ground. When the mower 20 is in the descending work state and the self-propelled vehicle body travels, the mower 20 moves the grass or turf by three rotary mowing blades 22L, 22C, and 22R (see FIG. 3) located inside the mowing blade housing 21. The mowing process is performed, and the inside of the mowing blade housing 21 is cut into the mowing blade housing 21 by the wind generated by the rotation of the rotating mowing blades 22L, 22C, and 22R. It is conveyed to the cut grass discharge port 23 (see FIG. 3) located at the lateral end, and discharged from the cut grass discharge port 23 to the lateral outer side of the self-propelled vehicle body while being guided by the discharge guide 24.

The self-propelled vehicle body will be described in detail.
The self-propelled vehicle body includes the pair of left and right front wheels 1 and 1 and the 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 vehicles. A driving unit having control levers 7, 7, a fall protection frame 8 located near the rear side of the driving seat 6, a transmission 9 that supports the left and right rear wheels 2, 2, and a front part of the transmission 9 And a rotating shaft 11 for transmitting the driving force of the power take-off shaft 10 located at the position to the cutting blade drive mechanism 20D of the mower 20. The left and right front wheels 1 are supported by the end portions 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. The left and right front wheels 1 swing with respect to the front wheel support frame 12 together with the front wheel support forks 13. The left and right rear wheels 2, 2 are individually driven by a pair of hydrostatic continuously variable transmissions (not shown) provided in the transmission 9, and a pair of hydrostatic non-rotating wheels by the pair of left and right control levers 7, 7. The gears are shifted to the forward side and the reverse side individually by the respective shift operations of the step transmission and stopped.

Next, the link mechanism 4 will be described in detail.
The link mechanism 4 is connected across the vehicle body frame 3 and the front end side of the cutting blade housing 21 of the mower 20, and a pair of left and right front swing links 4 a connecting the front end side of the mower 20 to the vehicle body frame 3 so as to be movable up and down. , 4a and a pair of left and right rear swing links 4b connected to the body frame 3 and the rear end side of the cutting blade housing 21 to connect the rear end side of the mower 20 to the body frame 3 so as to be movable up and down. 4b, and an interlocking link 4c connected to the front swing link 4a and the rear swing link 4b on both the left and right sides.

Next, the mower 20 will be described in detail. FIG. 3 is a bottom view of the mower 20. FIG. 4 is a perspective view from the bottom side of the mower 20.
As shown in these drawings, the mower 20 includes the cutting blade housing 21, the three rotary cutting blades 22L, 22R, and 22C, the cut grass discharge port 23, and the gauge wheel 25, A front baffle plate 40 provided in the cutting blade housing 21 so as to be disposed in front of the rotary cutting blades 22L, 22R, and 22C, and a rear of the rotary cutting blades 22L, 22R, and 22C in the cutting blade housing 21. And a rear baffle plate 50 provided on the side.

  The cutting blade housing 21 includes a top plate 21a, a front vertical wall 21b extending downward from the chevron-shaped front edge of the top plate 21a, and a cutting blade housing downward from the rear edge of the top plate 21a. The extended vertical wall 21c and the horizontal vertical wall 21d extending downward from the horizontal end portion of the top plate 21a downward from the cutting blade housing are formed into a container shape opened downward from the self-propelled machine body. The rear vertical wall 21c is positioned at both ends of the rear vertical wall 21c in the horizontal direction of the cutting blade housing and has an arcuate end wall 31 that has an arc shape when viewed in the vertical direction of the cutting blade housing, A straight intermediate wall 32 is provided between the arcuate end walls 31 and 31 and is linear when viewed in the vertical direction of the cutting blade housing. The cut grass discharge port 23 of the cutting blade housing 21 is formed by end portions of a top plate 21a, a front vertical wall 21b, and a rear vertical wall 21c.

  As shown in FIGS. 3 and 4, the rear vertical wall 21c is provided at the central portion of the linear intermediate wall portion 32 as a portion located at the central portion of the rear vertical wall 21c in the horizontal direction of the cutting blade housing. A vent hole 33 and a second vent hole 34 provided in the straight intermediate wall portion 32 are provided on both sides of the vent hole 33. Each of the second vent holes 34 and the vent holes 33 is a pair of left and right pipes that are inserted through the vent holes 33 and connected to the central cutting blade corresponding portion 52 of the rear baffle plate 50 and the linear intermediate wall portion 32. Of the support members 60, 60 made of sheet metal, the support member 60 closer to the second vent 34 is sandwiched. Each of the second vent holes 34 is disposed near the support member 60 sandwiched between the vent holes 33.

  As shown in FIGS. 3 and 4, the three rotary cutting blades 22L, 22R, and 22C are arranged in the horizontal direction of the cutting blade housing. Of the three rotary cutting blades 22L, 22R, and 22C, the central rotary cutting blade 22C (hereinafter, abbreviated as the central cutting blade 22C) located at the center in the horizontal direction of the cutting blade housing is provided from the cut grass discharge port 23. The uppermost rotary cutting blade 22L that is located farthest and located at the uppermost position in the cutting grass flow direction (hereinafter, abbreviated as the uppermost cutting blade 22L) and the uppermost position in the cutting grass flow direction In addition, it is located slightly on the front side of the cutting blade housing with respect to the most exhaust port side rotary mowing blade 22R (hereinafter, abbreviated as the most discharge port side mowing blade 22R) located closest to the cut grass discharge port 23. It is shifted. Each of the rotary cutting blades 22L, 22R, and 22C is integrally rotatable with a lower end portion of a cutting blade drive shaft 27 that is rotatably supported by a top plate 21a of the cutting blade housing 21 via a support member 26 that is a bearing support case. It is supported. Thereby, each rotary cutting blade 22L, 22C, 22R rotates with the cutting blade drive shaft 27 around the cutting blade housing vertical axis X provided in the cutting blade drive shaft 27. Each rotary mowing blade 22L, 22R, 22C includes a cutting blade 28 provided at both ends of the rotary mowing blades 22L, 22R, 22C, and a wind vane 29 provided on the back side of each cutting blade 28.

  The front baffle plate 40 includes a plate part 41 for the uppermost hand-cutting blade located in front of the rotation area 22LA of the uppermost hand-cutting blade 22L, and a space between the plate part 41 for the uppermost hand-cutting blade and the cut grass discharge port 23. And a discharge-side plate portion 44 located at the position. The discharge side plate portion 44 includes a central cutting blade plate portion 42 positioned in front of the rotation area 22CA of the central cutting blade 22C and a most discharge port side positioned in front of the rotation area 22RA of the most discharge opening side cutting blade 22R. And a cutting blade plate portion 43. The front baffle plate 40 is connected to the top plate 21 a of the cutting blade housing 21 by attachment rods 45 connected to a plurality of locations in the longitudinal direction of the front baffle plate 40. The front baffle plate 40 is constituted by three divided strip plates that are arranged in the longitudinal direction of the front baffle plate 40 and connected by a connection screw 46.

  The plate portion 41 for the uppermost hand cutting blade includes a concave curved guide surface 41a (see FIG. 6) facing the rotation area 22LA of the uppermost hand cutting blade 22L, and the uppermost hand cutting blade 22L is rotated by the rotation of the wind blade 29. Flow is guided by the concave curved guide surface 41a so that the wind generated in the rotation area 22LA flows toward the rotation area 22CA of the central cutting blade 22C. The wind guided from the uppermost hand cutting blade 22L to the rotation area 22CA conveys the cut grass cut by the cutting blade 28 of the uppermost hand cutting blade 22L to the rotation area 22CA of the central cutting blade 22C.

  The central cutting blade plate portion 42 includes a concave curved guide surface 42 a (see FIG. 6) that faces the rotation area 22 CA of the central cutting blade 22 C, and the central cutting blade 22 C rotates by the rotation of the wind blade 29. And the wind that flows into the rotation area 22CA from the uppermost hand-cutting blade 22L are flow-guided by the concave curved guide surface 42a so as to flow toward the cut grass discharge port 23. The wind that is flow-guided from the rotation area 22CA to the cut grass discharge port 23 includes the cut grass that has flowed into the rotation area 22C from the uppermost cutting blade 22L and the cut grass that has been cut by the cutting blade 28 of the central cutting blade 22C. It is conveyed to the cut grass outlet 23.

FIG. 6 is a cross-sectional plan view of the mower 20 at the lateral end (the lateral end opposite to the side where the cut grass discharge port 23 is located). The plate part provided with the plate part 41 for uppermost hand cutting blades and the plate part 42 for central cutting blades of the front baffle plate 40 is comprised as shown in FIG. In other words, the plate portion of the front baffle plate 40 including the uppermost hand cutting blade plate portion 41 and the central cutting blade plate portion 42 is positioned in front of the rotation area 22CA with respect to the rotational axis X of the central cutting blade 22C. A boundary 47 arranged close to the side on which the upper hand cutting blade 22L is located is provided. The boundary 47 is a boundary between the uppermost hand cutting blade plate portion 41 and the central cutting blade plate portion 42. This boundary 47 is constituted by the bending point of the bending strip constituting the front baffle plate 40. A portion of the front baffle plate 40 including the uppermost hand cutting blade plate portion 41 and the central cutting blade plate portion 42 has an interval D1 between the boundary 47 and the rotation region 2LA of the uppermost hand cutting blade 22L. The center cutting blade 22C is configured to be larger than the distance D2 from the rotation area 22CA. The portion of the front baffle plate 40 having the uppermost hand cutting blade plate portion 41 and the central cutting blade plate portion 42 is the uppermost hand cutting blade in the region where the boundary 47 of the uppermost hand cutting blade plate portion 41 is located. An interval D3 between the concave curved guide surface 41 of the blade plate portion 41 and the rotation region 22LA of the uppermost hand-cutting blade 22L is configured to increase toward the boundary 47. The extension line S extending from the boundary 47 in a state along the concave curved guide surface 41 of the plate portion 41 for the uppermost hand cutting blade passes through the rotation axis X of the central cutting blade 22C and the center cutting blade 22C. The plate part 41 for uppermost hand-cutting blades is configured to pass through the rotation area 22CA.
Thereby, the plate part 41 for uppermost hand-cutting blades forms a wind passage having an appropriate width and an appropriate shape between the rotation regions 22LA and 22CA, and the wind from the uppermost hand-cutting blade 22L passes through the wind passages. When flowing into the rotation region 22CA while converging with the wind from the central cutting blade 22C, it is difficult to generate turbulent airflow or strong cutting blade housing downward wind in the wind passage.

FIG. 7 is a cross-sectional plan view of the mower 20 at the other lateral end (the lateral end on the side where the cut grass discharge port 23 is located). As shown in this figure, the discharge side plate portion 44 of the front baffle plate 40 is moved toward the side where the cut grass discharge port 23 is located with respect to the rotation axis X of the central cutting blade 22C in front of the rotation area 22CA. The bending point 48 is arranged. The bending point 48 is a bending point at which the discharge side plate portion 44 is bent in the longitudinal direction of the cutting blade housing between the central cutting blade plate portion 42 and the most discharge port side cutting blade plate portion 43. The plate portion 43 for the most discharge side cutting blade as the lower side plate portion located on the lower side in the flow guide direction from the bending point 48 of the discharge side plate portion 44 is used as the plate portion 43 for the most discharge side cutting blade. It is arranged on the front side of the cutting blade housing with respect to a straight line L passing through the flow guide end point 43a and the bending point 48.
As a result, the discharge side plate portion 44 forms a confluence space having an appropriate width between the rotation areas 22CA and 22RA and the vicinity thereof, and is suitable between the confluence space and the cut grass discharge port 23. A wind passage having a wide width is formed, and the wind from the central cutting blade 22C and the wind from the most discharge port side cutting blade 22R merge in the merging space, and the wind passage is connected to the plate portion for the most discharge port side cutting blade. When the air flows into the cut grass outlet 23 while being guided by 43, it is difficult to generate a high-speed or strong air flow or wind toward the cutting blade housing downward in the merge space or the wind passage.

  The rear baffle plate 50 is connected to the uppermost hand cutting blade corresponding portion 51 corresponding to the uppermost hand cutting blade 22L, the central cutting blade corresponding portion 52 corresponding to the central cutting blade 22C, and the most discharge port side cutting blade 22R. A corresponding discharge port side cutting blade corresponding portion 53 is provided. The uppermost hand cutting blade-corresponding portion 51 has an arc shape along the rotation area 22LA of the uppermost hand cutting blade 22L as viewed in the vertical direction of the cutting blade housing. A part of the uppermost hand cutting blade corresponding part 51 is constituted by the arc-shaped end wall 31. The central cutting blade corresponding portion 52 has an arc shape along the rotation area 22CA of the central cutting blade 22C as viewed in the vertical direction of the cutting blade housing. The most discharge port side cutting blade corresponding portion 53 has an arc shape along the rotation area 22RA of the most discharge port side cutting blade 22R as viewed in the vertical direction of the cutting blade housing. A part of the most discharge port side cutting blade corresponding portion 53 is constituted by the arc-shaped end wall 31.

  That is, the driving force from the engine 5 is transmitted to the cutting blade drive mechanism 20D by the rotary shaft 11, and each cutting blade drive shaft 27 is driven by this cutting blade drive mechanism 20D, whereby each rotary cutting blade 22L, 22R, 22C. Is driven in the rotational direction A shown in FIG. 3 around the vertical axis X of the cutting blade housing of the cutting blade drive shaft 27. Then, the uppermost hand-cutting blade 22L and the most discharge-portion-side cutting blade 22R cause the air outside the cutting blade housing 21 to air out of the cutting blade housing 21 by the wind-up action of the wind-up blades 29. 21d is introduced into the rotation zones 22LA and 22RA from below the rear vertical wall 21c to generate an air flow, and the cutting blade 28 cuts the grass and grass while standing by the air flow. The central cutting blade 22C causes the air outside the cutting blade housing 21 to flow from the lower side of the front vertical wall 21b of the cutting blade housing 21 to the lower side of the rear vertical wall 21c and the air vent 33 by the wind action of the wind blowing blades 29. An air flow is generated from each second vent 34 and below the rear baffle plate 50 through the lower baffle plate 50 to generate an air flow, and the cutting blade 28 cuts the grass and grass while standing by the air flow. Since each gauge ring 25 is grounded to support the cutting blade housing 21 while being grounded, and each rotary cutting blade 22L, 22R, 22C is maintained at a set ground height as a set cutting height, each rotary cutting The cutting height by the blades 22L, 22R, and 22C becomes the set cutting height. The cut grass cut by the rotary cutting blades 22L, 22R, and 22C is guided to the rear baffle plate 50 and the front baffle plate 40 by the wind generated by the wind blades 29 of the rotary cutting blades 22L, 22R, and 22C. The inside of the cutting blade housing 21 is conveyed to the lateral one end where the cut grass discharge port 23 is located, and discharged from the cut grass discharge port 23 to the lateral outside of the cutting blade housing 21.

  As shown in FIG. 3, the mower 20 includes a pair of grounding rollers 61, 61, 62 provided side by side in the horizontal direction of the cutting blade housing on the front side and the rear side of the central portion of the cutting blade housing 21 in the horizontal direction of the cutting blade housing 21. , 62 are provided.

  The pair of left and right grounding rollers 61, 61 on the front side is supported by a pair of left and right support members 63 connected to the front vertical wall 21 b of the cutting blade housing 21 via a support shaft 64 so as to be freely rotatable. When there is an obstacle such as a raised part on the ground, the pair of left and right grounding rollers 61, 61 on the front side are grounded and supported so as not to ride on the obstacle and push the front end side of the cutting blade housing 21 into the obstacle. Get over obstacles.

  As shown in FIGS. 3, 4, and 5, the pair of left and right grounding rollers 62 and 62 on the rear side are connected to the rear baffle plate 50 and the linear intermediate wall 32, and the pair of left and right support members 60 and 60. A portion protruding rearward from the vent hole 33 is supported via a support shaft 65 so as to be freely rotatable. The pair of left and right grounding rollers 62, 62 on the rear side support the ground so that if there is an obstacle such as a raised portion on the ground, the rear end side of the cutting blade housing 21 will not be pushed into the obstacle. While overcoming 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.

[Another Example]
The present invention can be applied not only to a mower having three rotary cutting blades as in the above embodiment, but also to a mower having two rotary cutting blades or a mower having four or more rotary cutting blades. . Accordingly, the central cutting blade 22C is referred to as an adjacent cutting blade adjacent to the most discharge side cutting blade.

Side view of the entire riding mower Top view of the entire riding mower Moor's bottom view Mohr's perspective view Mohr's profile side view Cross-sectional plan view at one end of moore Cross-sectional plan view at the other side of the mower

Explanation of symbols

21 Cutting blade housings 22L, 22C, 22R Rotary cutting blades 22LA, 22CA, 22RA Rotating area 40 Front baffle plate 43 Lower side plate portion 43a Flow guide end point 44 Plate portion 48 Bending point L Straight line X Axis

Claims (2)

A plurality of rotary cutting blades positioned side by side in the horizontal direction of the cutting blade housing inside the cutting blade housing and rotatable about the vertical axis of the cutting blade housing, and a cutting grass drain located at a lateral end of the cutting blade housing. An outlet and a front baffle plate positioned in front of the rotation area of each rotary cutting blade inside the cutting blade housing so as to flow-guide the cut grass from each rotary cutting blade to the cut grass discharge port. Moor,
Of the front baffle plate, of the plurality of rotary cutting blades, the rotation area of the nearest discharge port side cutting blade closest to the cut grass discharge port, and the adjacent cutting blade adjacent to the most discharge port side cutting blade The plate portion located in front of the rotation area is configured as a bent plate portion bent in the front-rear direction of the cutting blade housing at a bending point arranged in front of the rotation area of the adjacent cutting blade,
A lower plate portion located on the lower side of the flow guide direction with respect to the bending point of the plate portion is disposed on the front side of the cutting blade housing with respect to a straight line passing through the flow guide end point of the lower plate portion and the bending point. Moor.   The mower according to claim 1, wherein the bending point is located closer to a side where the cut grass discharge port is located with respect to a rotation axis of the adjacent cutting blade in a rotation area of the adjacent cutting blade.

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