JP2009213437A - Cutter blade for grass mower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To put a bar blade with a blowing wing for a grass mower to be on a state can blow in a state high in wind affecting efficiency and have excellent blowing performance. <P>SOLUTION: A blade body 30 rotatingly driven around a cutter blade housing vertical axis P in a cutter blade housing, and a blowing wing 31 projecting backward in the width direction and in the blade body 30 vertical direction from the chip end part of the blade body 30, are equipped. The blowing wing 31 is raised and bent at a bending line 41 against the blade body 30. The bending line 41 is set to incline to a center line 42 so as to approach one end 41a to a chip end 30a of the body 30 and the bending line is more inclined such that the more the bending line approaches to the center line 42 in the width direction of the blade body 30 as it approaches the blade body chip end side. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a blade body that is driven to rotate about the vertical axis of the cutting blade housing inside the cutting blade housing, and projects backward from the tip of the blade body in the lateral direction of the blade body and upwards of the blade body. The present invention relates to a cutter blade for a mowing device provided with a wind-up blade.

The above-described cutter blade generates wind in the mowing room by the wind wings, and stands up so that the grass can be easily cut by the wind, or transports the cut grass to the discharge port of the cutting blade housing.
Conventionally, for example, this type of cutter blade is described in Patent Document 1.
Patent Document 1 describes a rotary cutter blade as a cutter blade. This rotary cutter blade includes a blade portion as a blade body and a warping piece as a wind wing.

Japanese Utility Model Laid-Open No. 4-127119 (paragraph [0010], FIG. 2)

This type of cutter blade is composed of a refracting plate that is bent so that the wind-up blade rises with respect to the blade body. As a result, when the wind-up blade is raised and refracted with respect to the blade body by a fold line parallel to the center line in the lateral width direction of the blade body, the wind-up performance of the wind-up blade tends to be lowered.
That is, in this type of cutter blade, when the gap between the blade body and the wind-up blade and the side wall of the cutting chamber (hereinafter referred to as the cutting chamber side wall) increases, wind leakage from the gap increases. For this reason, when the side of the wind wing facing the mowing chamber side wall is inclined with respect to the extending direction of the wind wing from the blade body, the side of the wind wing facing the mowing chamber side wall and the wind The distance from the intersection of the blade with the edge in the extending direction from the blade body to the rotation axis of the blade body may be equal to or substantially equal to the distance from the blade body tip to the rotation axis of the blade body. In addition, the entire side of the wind wing facing the mowing chamber side wall can be brought close to the mowing chamber side wall, and the gap between the wind wing blade and the mowing chamber side wall can be made as small as possible.
However, in this case, the distance between the side facing the mowing chamber side wall of the wind wing and the side facing the side becomes smaller as it reaches the extended end of the wind wing from the blade body, that is, Even if the wind-up blade is tapered and the length of the wind-up blade in the direction of extension from the blade body is increased, the size of the wind-up action surface of the wind-up blade is the same as the length of the wind-up blade. It gets smaller.

  An object of the present invention is to provide a bar blade for a mowing apparatus that can be provided with excellent air blowing performance while being able to wake up in a state where the working efficiency of wind is high.

The first aspect of the present invention includes a blade body that is driven to rotate about a vertical axis of the cutting blade housing inside the cutting blade housing, a rearward direction in the width direction of the blade body from the tip of the blade body, and an upward direction of the blade body In a cutter blade for a mowing device provided with a wind wing projecting to
Raise and refract the wind wing at the fold line with respect to the blade body,
The bend line is set so that one end reaches the tip of the blade body and is inclined with respect to the center line so as to approach the center line in the lateral width direction of the blade body as it reaches the tip of the blade body. is there.

According to the configuration of the first aspect of the invention, the distance between the side facing the mowing chamber side wall of the wind wing and the side facing the side is made the same over the entire length of the wind wing in the extending direction from the blade body. Even if the wind-up blade is provided with a large wind-up action surface, the gap between the wind-up blade and the side wall of the cutting chamber can be reduced.
In other words, the folding line where the wind-up blade rises with respect to the blade body is inclined with respect to the center line of the blade body, so that the side of the wind-up blade facing the cutting chamber side wall and the extension from the blade body The distance from the intersection with the edge of the edge in the direction to the rotation axis of the blade body is equal to or substantially equal to the distance from the tip of the blade body to the rotation axis of the blade body, and the side wall of the mowing chamber of the wind blade Thus, the entire side of the cutting chamber can be brought close to the side wall of the cutting chamber so that the gap between the wind wing and the side wall of the cutting chamber can be minimized.

  Therefore, it is possible not only to reduce the wind leakage in the gap between the wind-up blade and the side wall of the cutting chamber, but to efficiently operate the wind generated by the wind-up blade, and to increase the wind-up action surface of the wind-up blade. A high-quality cutter that allows the wind-up blades to have excellent blowing performance, and allows the grass to stand up and transport with good performance in terms of wind working efficiency and wind blowing performance. A blade can be obtained.

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, this riding-type mower is configured to be self-propelled by a pair of left and right front wheels 1 and 1 that can be steered and a pair of left and right rear wheels 2 and 2 that can be driven. And a self-propelled vehicle equipped with a driving section 5 having a driving seat 3 provided at the rear part of the vehicle body and a steering wheel 4 provided in front of the driving seat 3. Are provided with a mowing device 20 connected to each other via a link mechanism 7.

This riding mower performs mowing work.
That is, the self-propelled vehicle includes an engine 8 provided at the front portion of the vehicle body, and the driving force of the output shaft 8a of the engine 8 is transmitted to the hydrostatic continuously variable transmission 10 by the transmission belt 9 so that the forward driving force and the reverse drive are transmitted. The forward drive force and the reverse drive force are transmitted to the pair of left and right rear wheels 2 and 2.

  The link mechanism 7 is swung up and down with respect to the vehicle body frame 6 by an elevating lever 11 provided in the operation unit 3, and a descent work state where the grounding gauge wheel 21 contacts the ground with the ground gauge wheel 21 and the grounding The gauge wheel 21 is moved up and down to the non-working state where the gauge wheel 21 is lifted from the ground. When the self-propelled vehicle is driven with the mowing device 20 in the descending operation state, the mowing device 20 is driven by the driving force from the output shaft 8a of the engine 8 and is lined in the horizontal direction of the vehicle body inside the cutting blade housing 22. Mowing is performed by the two cutter blades 23 positioned at, and the cut grass is discharged from the cutting blade housing 22 to the outside.

  FIG. 3 is a plan view of the mowing apparatus 20. FIG. 4 is a cross-sectional plan view of the mowing apparatus 20. As shown in these drawings, the mowing apparatus 20 includes the cutting blade housing 22 and the two cutter blades 23 and 23 according to the embodiment of the present invention, as well as the upper surface side of the cutting blade housing 22. Are provided with an input belt 24 and a blade drive belt 25.

  The two cutter blades 23, 23 are arranged so as to be located one by one in each of the two cutting chambers 26, 26 provided in the cutting blade housing 22 side by side in the cutting blade housing lateral direction (vehicle body lateral direction), It is rotatably supported on the top plate 22 a of the cutting blade housing 22 via the rotation support shaft 27.

  Each of the cutting chambers 26 is formed by the top plate 22a and the side wall 22b of the cutting blade housing 22, and a guide plate 28 attached to the inside of the cutting blade housing 22, and is substantially circular when viewed in the vertical direction of the cutting blade housing. . The side wall 22 b of the cutting blade housing 22 and the guide plate 28 are side walls of the cutting chamber 26. One mowing chamber 26 includes a discharge port 29 that opens toward the lateral outer side of the cutting blade housing 22 at one lateral end of the cutting blade housing 22. The pair of cutting chambers 26, 26 communicate with each other at the central portion of the cutting blade housing 22 in the lateral direction.

  The cutter blade 23 of each mowing chamber 26 includes a single blade body 30 that is supported by the rotary support shaft 27 so as to be integrally rotatable at the center portion in the longitudinal direction thereof, and blades from both ends of the blade body 30. The main body 30 includes a wind-up blade 31 extending rearward in the rotational direction. The blade body 30 includes blade portions 32 provided at one end side in the width direction of the blade body 30 at both ends of the blade body 30, that is, on the front side in the rotational direction of the blade body 30.

  As shown in FIGS. 1 and 3, the input belt 24 is wound around an output pulley 8 b provided on the output shaft 8 a of the engine 8 and an input pulley 33 provided on the upper surface side of the cutting blade housing 22. ing. As shown in FIG. 9, the blade drive belt 25 includes a transmission pulley 35 that is linked to the input pulley 33 by a connecting cylinder shaft 34, and a blade drive pulley 36 that is rotatably provided integrally with a rotation support shaft 27 of each cutter blade 23. And two guide pulleys 37 supported by the top plate 22a so as to be freely rotatable, and a tension pulley 40 supported by a support shaft 38 of the input pulley 33 via a tension arm 39, The driving force of the input pulley 33 is transmitted to the rotation support shaft 27 of each cutter blade 23.

  In other words, the mowing device 20 transmits the driving force of the output shaft 8a of the engine 8 to the rotating support shaft 27 of each cutter blade 23 by the input belt 24 and the blade driving belt 25, thereby causing the two cutter blades 23 and 23 to respectively transmit. The rotary support shaft 27 of the cutting blade housing is rotated about the vertical axis P (hereinafter referred to as the rotation axis P), and in each cutting chamber 26, the two blade portions 32, 32 of the cutter blade 23 are driven. Mowing by. At this time, a swirling wind is generated by the two wind-up blades 31, 31 of the cutter blade 23, the grass is erected so as to be easily cut by the wind, and the cut grass is positioned on the lateral end side of the cutting blade housing 22. It is conveyed to the discharge port 29 and discharged from the discharge port 29 to the outside of the cutting blade housing 22.

FIG. 7 is a plan view of one end side of the cutter blade 23. FIG. 8 is a side view of the cutter blade 23. As shown in these drawings and FIG. 4, the cutter blade 23 is formed by bending one of the blades 31 positioned at both ends of the blade body 30 so that the blade body 30 rises at a folding line 41 with respect to the blade body 30. It is constituted by a refracting plate.
That is, the wind-up blades 31 positioned at both tip portions of the blade body 30 are raised and refracted by the fold line 41 with respect to the blade body 30, and are directed backward from the blade body 30 in the lateral width direction of the blade body 30 (blade body 30 In the direction of the rotation of the blade body) and upward of the blade body.

The folding line 41 of each wind blade 31 is brought closer to the center line 42 in the lateral width direction of the blade body 30 so that one end 41a thereof reaches the tip 30a of the blade body 30 and the tip of the blade body 30 The side wall 22b as the side wall of the cutting chamber 26 and the gap between the guide plate 28 and the wind-up blade 31 are leaked by the wind-up blade 31. It is configured in a small gap so that it does not easily occur. The tip 30 a of the blade body 30 has a linear shape along the width direction of the blade body 30.
That is, the intersection of the side 31a facing the side wall of the trimming chamber 26 of the wind-up blade 31 located at both ends of the blade body 30 and the end 31b in the extending direction of the wind-up blade 31 from the blade body 30. The distance L1 from 31c to the rotational axis P of the blade body 30 is made equal to the distance L2 from the tip 30a of the blade body 30 to the rotational axis P of the blade body 30.

  As shown in FIGS. 3 and 5, the mowing device 20 includes an outer discharge guide 50 and an inner discharge guide 51 that are provided so as to overlap with a lateral end portion of the cutting blade housing 22 where the discharge port 29 is located. Yes.

  The outer discharge guide 50 and the inner discharge guide 51 are attached to a bracket 52 provided on the upper surface side of the cutting blade housing 22, a connection arm portion 50 a of the outer discharge guide 50, and a connection portion 51 a of the inner discharge guide 51. It is pivotally supported by the bracket 52 via the single support shaft 53, and swings up and down around the shaft center of the support shaft 53 in an ascending storage state and a descending use state. The outer discharge guide 50 is made by molding a resin material and is a resin guide. The outer discharge guide 50 has a larger projection length from the bracket 52 than the projection length of the inner discharge guide 51 from the bracket 52. The inner discharge guide 51 is made of a steel plate and is a steel plate guide.

  FIG. 5 is a longitudinal sectional view of the cut grass discharge unit of the mowing device 20 in the first working state. As shown in this figure, when the inner discharge guide 51 is moved downward and swinged, and the connecting portion 51a abuts against and supports the top plate 22a of the cutting blade housing 22, the inner discharge guide 51 is moved to the cutting blade housing. It will be in the descent use state extended from 22 toward the outer side. When the outer discharge guide 50 is operated to move downward, and the inner surface of the outer discharge guide 50 comes into contact with the upper surface of the inner discharge guide 51 and is received, the outer discharge guide 50 extends from the cutting blade housing 22 toward the lateral outer side. It will be in the lowered use state. Then, the cut grass discharge portion of the mowing device 20 enters the first working state, and the cut grass released from the discharge port 29 of the cut blade housing 22 is transferred to the blade housing 22 by the inner discharge guide 51 and the outer discharge guide 50. Release guidance to fly together without spreading to the outside. At this time, the inner discharge guide 51 serves as a cover for the outer discharge guide 50 and prevents the outer discharge guide 50 from being worn by contact with cut grass or the like. The inner discharge guide 51 is urged to the lowered use state by the spring 54, and the outer discharge guide 50 is urged to the lowered use state by the spring 55.

  FIG. 6 is a longitudinal sectional view of the cut grass discharge portion of the mowing device 20 in the second working state. As shown in this figure, when the outer discharge guide 50 is operated to swing upward and a detent type positioning mechanism (not shown) provided across the connecting arm portion 50a and the bracket 52 is in an activated state, the outer discharge guide 50 is operated. 50 is in an ascending and retracted state standing with respect to the cutting blade housing 22. The inner discharge guide 51 is set in the lowered use state. Then, the cut grass discharging portion of the mowing device 20 enters the second working state, and the cut grass discharged from the discharge port 29 of the cutting blade housing 22 is discharged by the inner discharge guide 52 so as to fly to the lateral outer side of the blade housing 22. invite. At this time, the protruding length of the discharge guide from the discharge port 29 is shorter than the protruding length in the first working state, and the operation can be performed in a state where it is easy to avoid hitting the discharge guide with respect to the tree or the like.

As shown in FIG. 3, the mowing device 20 includes a belt presser 58 provided in the vicinity of the input pulley 33 on the upper surface side of the cutting blade housing 22.
As shown in FIGS. 9 and 10, the belt retainer 58 has a belt retainer body having a pair of stopper portions 59a and 59a that act on the input belt 24 to prevent the input belt 24 from being detached from the input pulley 33. 59, a mounting arm 60 extending from an intermediate portion of the belt pressing body 59, and a detent arm 61 extending from one end of the belt pressing body 59.

  The belt retainer 58 fastens the attachment arm 60 to the upper end portion of the support shaft 38 of the input pulley 33 by a connecting screw 62 and locks the rotation stop arm 61 in the engagement hole of the cutting housing 22. It will be in a wearing state. The anti-rotation arm 61 prevents the belt pressing body 59 from rotating around the axis of the connection screw 62.

  The self-propelled vehicle includes a battery 66 for power supply provided in an engine storage chamber partitioned by a boarding space of the driving unit 5 and a partition wall plate 65 (see FIG. 1). The battery 66 is located on the rear side of the engine 8.

FIG. 11 is a plan view of the battery housing portion. FIG. 12 is a side view of the battery housing portion. As shown in these drawings, the battery 66 is mounted on a battery mounting plate 67 supported by the vehicle body frame 6, and is attached to the battery mounting plate 67 by a holding plate 68 mounted on the upper surface of the battery 66. Fixed.
One end of the pressing plate 68 is engaged with a fixing plate 69 on the vehicle body side by a notch 68a, and a lock screw 71 provided on a support rod 70 attached to the other end side of the pressing plate 68 is tightened. As a result, the battery 66 is clamped on the upper surface of the battery 66 and pressed against the battery mounting plate 67 to be fixed.
Even when the fastening by the lock screw 71 is released, the pressing plate 68 remains on the upper surface of the battery 66 and does not inadvertently fall off from the battery 66.

  As shown in FIG. 2, the self-propelled vehicle includes a speed change pedal 75 and a brake pedal 76 that are provided side by side in the vehicle body lateral direction at the front end of the driving unit floor.

FIG. 13 is a cross-sectional view of a support structure for the speed change pedal 75 and the brake pedal 76. As shown in the figure, the shift pedal 75 is supported by a pair of left and right supports 78, 78 via a fulcrum shaft 77 whose one end is connected to an arm portion 75a of the shift pedal 75 so as to be integrally rotatable. Yes. The pair of left and right supports 78, 78 are fixed to the vehicle body side.
The shift pedal 75 shifts the hydrostatic continuously variable transmission 10 to the forward side by being stepped on from the neutral position to the front side of the vehicle body around the lateral axis of the vehicle body included in the fulcrum shaft 77. The shift pedal 75 is operated to depress the hydrostatic continuously variable transmission 10 to the reverse side by being depressed from the neutral position to the vehicle rear side around the vehicle body lateral axis.

The brake pedal 76 is supported by the pair of left and right supports 78 and 78 via a boss member 79 made of a bent sheet metal attached to the fulcrum shaft 77 so as to be relatively rotatable, and the fulcrum shaft 77.
The brake pedal 76 is depressed around the vehicle body lateral axis provided on the fulcrum shaft 77, thereby operating a travel brake (not shown) to the on state so that the left and right rear wheels 2 and 2 are turned on. Apply the brake.

Overall side view of riding mower Overall plan view of a riding mower Top view of mowing equipment Cross-sectional plan view of mowing equipment Longitudinal section in the first working state of the cut grass discharge part Longitudinal section in the second working state of the cut grass discharge part Plan view of one end of the cutter blade Side view of cutter blade Vertical section of the input part of the mowing device Perspective view of belt presser Plan view of battery compartment Side view of battery compartment Sectional view of the support structure for the shift pedal and brake pedal

Explanation of symbols

22 Cutting blade housing 30 Blade body 30a Tip 31 of blade body Winding blade 41 Folding line 42 Center line P Cutting blade housing vertical axis

Claims (1)

A blade body that is rotationally driven around the vertical axis of the cutting blade housing inside the cutting blade housing, and a wind-up blade that protrudes backward from the tip of the blade body in the lateral direction of the blade body and upwards of the blade body A cutter blade for a mowing device comprising:
Raise and refract the wind wing at the fold line with respect to the blade body,
The bend line is set so that one end reaches the tip of the blade body and is inclined with respect to the center line so as to approach the center line in the lateral width direction of the blade body as it reaches the tip of the blade body. A cutter blade for a certain mowing device.

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