JP3193261B2 - Lawn mower transport device for lawn mower - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lawn mower transport apparatus for transporting mowing grass cut with a lawn mowing blade in a cutter housing of a lawn mower to a glass bag through a mowing grass transport duct together with air. is there.

[0002]

2. Description of the Related Art In a conventional lawn mower, as shown in Japanese Utility Model Publication No. 5-2050, a lawn mower cut with a lawn mowing blade in a cutter housing below the lawn mower is used as the cutter. It is sucked up by the centrifugal blower in the lawn grass transfer duct connected to the side opening of the housing,
It was to be transported to a glass bag.

[0003] By the way, dried grass is light and has low adhesion, so that grass can be reliably transported to a glass bag. The flow rate of the mixed air in the grass decreases, and grass is adhered to the inner wall surface of the grass transport duct, and the adhesion layer becomes large and the grass is easily clogged.To avoid this, the size of the centrifugal blower must be increased. As the speed increases, the running performance of the lawnmower decreases, the noise level increases, and the weight of the lawnmower increases the weight of the lawn mower. There was a drawback that the lawn mower surface was uneven and the lawn mowing finish was inferior.

As a solution to such a drawback, there has been a lawn mower described in Japanese Patent Application Laid-Open No. 6-14633.

In the mower described in Japanese Patent Application Laid-Open No. Hei 6-14633, a lawn grass transport blower is composed of a throwing fan for throwing grass, and a turbo turbo fan. The fan and the back blade are integrally joined back to back, and the grass clipped by the throwing fan through the opening of the cutting blade housing is converted into a grass container with the air exhausted from the transport turbo fan. I was trying to carry it.

However, even if the throwing fan and the transfer fan mower mowers having the same diameter and rotating at the same rotation speed, the effect of promoting the transfer of cut grass by the transfer turbofan cannot be obtained. .

In order to investigate the cause, the inventor of the present invention has observed the flow state of air in the blower case in the mower. However, the air bypassed from the outlet of the transfer turbo fan to the outlet of the throwing fan. It was found that the release of the grass from the throwing fan into the blower case was obstructed.

The theoretical head H _th of a centrifugal blower is

(Equation 1) Here, U ₁ , U ₂ ; peripheral velocities Cθ ₁ , Cθ _{2 of the} impeller inlet and outlet; absolute swirl velocity components of the fluid at the impeller inlet and outlet. Also, the total pressure rise P raised by the impeller or fan in the centrifugal blower
_th is

(Equation 2) It is.

In the Mower's transfer turbofan, the suction port is opened at the center of the turbofan, whereas in the throwing fan, the fan drive unit is arranged at the center of the body width of the throwing fan. Therefore, the suction port of the throwing fan is opened at the lower outer peripheral portion of the throwing fan, and as a result,
As is evident from Equation 2, the total pressure increase of the air boosted by the transfer turbofan having a small peripheral speed at the fan inlet is as follows:
The total pressure rise of the air boosted by the throwing fan, which is as high as that of a normal centrifugal blower but the peripheral speed of the fan inlet is not so different from the peripheral speed of the fan outlet, is caused by the total pressure rise by the transfer turbofan. Since it is lower than that, it is presumed that the phenomenon of air detour from the outlet of the transfer turbo fan to the outlet of the throwing fan occurs as described above.

[0010]

SUMMARY OF THE INVENTION The present invention, which has been completed as a result of the above-described investigation of the cause, is provided with a mowing turf in a cutter housing provided in a turf mower main body. The suction port of the turfgrass discharge centrifugal blower is connected, and a blower-only centrifugal blower is provided in parallel with the cut grass turf grass discharge centrifugal blower. In a lawn mower connected to a duct and the rotation axes of the two centrifugal blowers are oriented in the horizontal direction, the centrifugal blower for discharging the cut grass and the centrifugal blower dedicated to the blower are driven to rotate in the same direction by a motor mounted on the lawn mower. The impeller outer diameter of the centrifugal blower for discharging grass clippings is set to be larger than the impeller outer diameter of the centrifugal blower dedicated to blowing.

In the present invention, the lower portion of the outer peripheral wall of the centrifugal blower for discharging grass clippings approaches the ground at substantially the same height as the outer peripheral edge of the lower end of the cutter housing, and the lower portion of the suction port of the centrifugal blower for discharging grass clippings is the centrifugal blower. Opened to the outer periphery of the centrifugal blower below the rotation axis of the centrifugal blower, even if the diameter of the impeller inlet of the centrifugal blower for discharging the cut grass is larger than the diameter of the impeller inlet of the centrifugal blower dedicated to blowing, Since the outer diameter of the impeller outlet of the centrifugal blower is larger than the outer diameter of the impeller outlet of the blower-specific centrifugal blower, the total pressure at the outlet of the lawn grass discharge centrifugal blower is equal to the total pressure at the outlet of the blower-specific centrifugal blower. It is possible to avoid the phenomenon of the air diverting from the outlet of the centrifugal blower for exclusive use of the blower to the outlet of the centrifugal blower for discharging grass, such as the conventional one. The flow energy of the air discharged from the outlet of the blower-dedicated centrifugal blower can be effectively used, and while avoiding an increase in the noise level due to the high-speed rotation of the centrifugal blower, the cut grass grass in the grass cut grass transfer duct can be removed. The clogging is prevented beforehand, and the air containing grass clippings discharged into the grass clippings conveying duct from the outlet of the centrifugal blower for discharging grass clippings can be reliably transported to the glass bag.

[0012] According to the second aspect of the present invention, the total pressure of the impeller outlet of the centrifugal blower for discharging grass clippings can be set to be higher than the total pressure of the impeller outlet of the centrifugal blower dedicated to blowing. The same operation and effect as described above can be obtained.

According to the third aspect of the present invention, the cut grass cut in the cutter housing can be easily guided to the cut grass discharge centrifugal blower.

[0014]

[0015]

[0016]

[0017]

[0018]

[0019]

[0020]

[0021]

[0022] Further, according to the fourth aspect of the present invention, the blowing path of the centrifugal blower for discharging grass clippings and the blowing path of the centrifugal blower dedicated to blowing can be rationally formed without interfering with each other. Can be smoothly transported, and the suction head of the blower can be lowered to prevent the suction of foreign substances into the blower-specific centrifugal blower, thereby facilitating the transfer of cut grass.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the general structure of the riding grass mower 0 in the embodiment shown in FIGS.
The riding lawn mower 0 includes front wheels 2 and rear wheels 3 in front and rear, left and right, and includes a steering wheel 5 in front of a seat 4. The riding lawn mower 0 is steered left and right by steering the steering wheel 5. Internal combustion engine 6 mounted on the grass mower body 1 of the riding grass mower 0
(See FIG. 8 and FIG. 13.)

A cutter housing 7 is suspended below the lawn mower body 1 so as to be able to move up and down, and two cutter blades 9 are provided in the cutter housing 7 so as to be rotatable about a vertical axis. The grass is cut by the grass cutting blade 9 which is driven to rotate while the cutter housing 7 is lowered.

Further, a cutter housing-side suction duct 11 of the centrifugal blower housing 10 is connected to the cut grass discharge port 8 of the cutter housing 7, and a centrifugal blower for discharging grass cut near the cutter housing-side suction port 12 a in the centrifugal blower housing 10. While 14 impellers 15 are disposed, an impeller 17 of a centrifugal blower 16 dedicated to the blower is disposed on the outer side of the vehicle body in the centrifugal blower housing 10, and the impellers 15 and 17 are integrally connected to each other, and Turf blade 9
The blades 9a are provided with jumping blades 9a, which are blades for conveying grass, and the power of the internal combustion engine 6 is transmitted to the grass blade 9 and the impellers 15, 17 via a belt transmission mechanism as described later. Turfgrass mixed air in the housing 7 jumps up through the cutgrass grass discharge port 8, the cutter housing side suction duct 11 and the cutter housing side suction port 12a.
In addition to being sucked into the centrifugal blower housing 10 by the centrifugal blower impeller 15 for discharging grass and grass, air in the atmosphere is sucked into the centrifugal blower housing 10 by the centrifugal blower impeller 17 dedicated to the blower through the air suction port 12b. ,
The cut grass mixed air and the air in the atmosphere are mixed and sent to the discharge port 13.

Further, a suction duct 20 of a glass bag unit 19 is connected to a discharge port 13 of the centrifugal blower housing 10 through a communication duct 18.
The grass cut in the inside is separated and collected in the glass bag 21 of the glass bag unit 19.

Next, the schematic structure of the cutter housing 7 and the lifting mechanism will be described. The planar shape of the cutter housing 7 is a deformed oval shape in which one long side located forward is gently curved outward, and a cut grass turf discharge port 8 at one end thereof.
A peripheral wall 23 curved downward from the outer periphery of the top wall 22 is formed except for the cut grass grass discharge port 8 of the deformed oval cutter housing 7 on the right side and slightly behind the cut grass grass discharge port 8 and the opposite end. And is suspended on the lawn mower body 1 by the following mechanism.

That is, a cutting blade pivot hole 24 is formed on the left and right sides of the top wall 22 of the cutter housing 7, and a cutting blade shaft 25, which is integrated with the lawn grass cutting blade 9, is oriented in the vertical direction via a bearing (not shown). An auxiliary wheel 27 is rotatably supported by a bracket 26 near four front, rear, left and right corners of a peripheral wall 23 of the cutter housing 7 so as to be rotatable back and forth.

Further, mounting pieces are provided at the front of the peripheral wall 23 of the cutter housing 7 and at the rear of the top wall 22 of the cutter housing 7.
The rear ends of a pair of left and right elevating links 30 and a substantially central portion of a pair of left and right elevating links 31 are pivotally attached to the mounting pieces 28 and 29 so as to be tiltable up and down. The lifting link 3
The front ends of 0 and 31 are mounting pieces 32 and 3 integrated with the lawn mower body 1.
A vertical link is pivotally attached to the vertical link 3 and a vertical link is formed by four pivot points of the vertical links 30 and 31, and a horizontal rod 34 is bridged over the rear ends of the pair of right and left vertical links 31. The lower end of a connecting member 35 is pivotally attached to the horizontal rod 34, and the lawn mower body 1
The upper curved portion of the connecting member 35 is engaged with a tilting rod 36 pivotally supported so as to be able to tilt up and down, and the tilting rod 36 is provided on the left rear side of the seat 4 so as to be capable of tilting up and down a cutter housing. The tilting rod is connected to the rod 37 via a connecting member (not shown).
When the cutter housing elevating operation lever 37 is tilted up and down, the cutter housing 7 can be moved up and down while being held substantially parallel to the ground. In a state where the housing 7 is lowered and the auxiliary wheels 27 are in contact with the ground, the lower end edge of the top wall 22 of the cutter housing 7 keeps a fixed interval with respect to the ground, and the cutter housing 7 together with the riding lawn mower 0 It can run integrally.

Also, in the structure in which the cutter housing-side suction duct 11 of the centrifugal blower housing 10 is connected to the cut grass discharge port 8 of the cutter housing 7 opened to the right of the lawn mower body 1, FIG. 7 to FIG. As illustrated in
Axial insertion sleeves 38 and 39 that are vertically oriented are integrally mounted on the front and rear ends of the cut grass discharge opening 8 of the cutter housing 7, and brackets 40 are provided on front and rear ends of the suction duct 11 on the cutter housing side of the centrifugal blower housing 10. , 41, the shaft fitting sleeves 42, 43 oriented in the up and down direction are integrally mounted, the shaft fitting sleeves 38, 42 have a hinge shaft 44, and the shaft fitting sleeves 39, 43 have a hinge shaft 45. Each of the hinge shafts 44 and 45 is inserted so that the centrifugal blower housing 10 can turn around one of the hinge shafts 44 and 45 if one of the hinge shafts 44 and 45 is inserted and the other is removed. If both hinge shafts 44 and 45 are removed, centrifugal blower housing
10 is designed to be separated from the cutter housing 7.

As shown in FIGS. 4 and 8, the impeller support bracket 46 is located in the vicinity of the center of the air suction port 12b of the centrifugal blower housing 10 in the front-rear direction, as shown in FIG. The inwardly bent attachment portions 47 and 48 at the front and rear ends of the impeller support bracket 46 are provided on the front and rear peripheral surfaces of the centrifugal blower housing 10.
The impeller support bracket 46 is fixed to the impeller support bracket 46 at a central portion of the impeller support bracket 46, and is integrally provided with the impeller support sleeve 51. The impeller support sleeve 51 is rotatable on the impeller support sleeve 51. Impeller rotating shaft
52, an impeller 15 of a centrifugal blower 14 for discharging grass and grass and an impeller 17 of a centrifugal blower 16 dedicated to blowing are integrally mounted back to back via a disk-shaped disk 15b, and an impeller of the centrifugal blower 14 for discharging grass and grass. 15 and centrifugal blower dedicated to ventilation 16
The impeller rotation shaft 52 integral with the impeller 17 is rotatably supported by the impeller pivot sleeve 51 via a ball bearing.

Further, a pulley supporting plate horizontally oriented to the front folded reinforcing piece 49 (see FIG. 8) bent forward from the inner bent mounting part 47 and the inner bent mounting part 47. 50
The pulley support shafts 53 and 54 are integrally provided on the upper and lower surfaces of the pulley support plate 50, and are provided at a central portion of the impeller support bracket 46 in the vehicle width direction at predetermined intervals in the front and rear directions. Oriented support shafts 55 and 56 for projecting the cover are integrally provided.

As shown in FIGS. 4, 10 and 14, the centrifugal blower impeller 15 for discharging the cut grass is larger in diameter than the centrifugal blower impeller 17 dedicated to the blower and the centrifugal blower for discharging the cut grass. The blade width (axial dimension) of the blower impeller 15 is also set to be wider than the blade width of the centrifugal blower impeller 17 dedicated to blowing, and four blades 15a of the centrifugal blower impeller 15 for discharging grass clippings are equally spaced in the circumferential direction. A large number of blades 17a of the centrifugal blower impeller 17 dedicated to the blower are arranged at equal intervals in the circumferential direction (24 in the embodiment), and the blade outlet angle α of the centrifugal blower impeller 15 for discharging grass clippings.
As shown in FIG. 14, the centrifugal blower impeller 15 for cutting grass is formed so as to be a rearward-facing blade, and the blade outlet angle β of the centrifugal blower impeller 17 for air blowing is as shown in FIG. 14. As shown in the figure, the oblique angle centrifugal blower impeller 17 is formed to be a forward facing blade (so-called sirocco fan).

As shown in FIG. 15, wings 15c and 15d are formed from the side edges of the blades 15a of the impeller 15 of the centrifugal blower for discharging grass clippings in the direction of rotation of the impeller.
The wing 15c is parallel to the disc 15b, while the wing 15d is inclined as shown in FIG.

In the centrifugal blower housing 10, as shown in FIGS. 4, 8 and 10, it is located on the outer periphery of the centrifugal blower impeller 17 dedicated to air blow, and as shown in FIGS. 8 and 11, About 270 ° at the central angle excluding the discharge port 13
Or a notched annular separator with a smaller angle
59 is provided along a plane orthogonal to the center of the impeller rotation shaft 52.

Lastly, the power transmission system of the turf grass cutting blade 9, the centrifugal blower impeller 15 for discharging turf grass and the centrifugal blower impeller 17 dedicated to blasting will be described. As shown in FIG. 8, FIG. 12, and FIG. A power take-off pulley 61 is integrally fitted to an output shaft 60 (with a built-in clutch 60a) of the internal combustion engine 6 which is oriented in the front-rear direction.
A pair of left and right pulleys 62 are pivotally supported below the pulley 61 so as to be rotatable about the width direction of the body 1 of the lawn mower. The driven pulley 63 is rotatably supported, and the engine take-off pulleys 61, 62, 63 have an engine V-belt 65 bridged over them. The clutch 60a is connected, and the internal combustion engine 6 is brought into an operating state. When the take-out pulley 61 rotates, the drive pulley 64 integrated with the driven pulley 63
Are driven to rotate clockwise in FIG.

As shown in FIGS. 12 and 13, the driven pulley 63 and the drive pulley 64 are pivotally supported by the top wall 22 of the cutter housing 7 via a pulley support arm 66 so as to be swingable. Lever 66a integral with arm 66
A coil spring 90 is stretched on the cutter housing top wall 22 and the integral protruding piece 22a.
90 ensures that a constant tension always acts on the engine V-belt 65.

As shown in FIG. 12, an idler pulley 67 is provided adjacent to the drive pulley 64 and has a pulley support arm.
A pair of right and left turfgrass cutting blades 9 is pivotably supported via 68.
A cutter pulley 69 is fitted with the cutting blade shaft 25, and a cutter V-belt 70 is bridged over a drive pulley 64, an idler pulley 67, and a cutter pulley 69.
An impeller drive pulley 71 is provided integrally with 69r, and a coil spring 91 is stretched between the pulley support arm 68 and a protruding piece 22b integral with the cutter housing top wall 22, and the drive pulley 64 is driven to rotate. In this state, a pair of right and left lawn mowing blades 9 are driven to rotate while a constant tension acts on the cutter V-belt 70 by the coil spring 91.

Further, as shown in FIGS. 4, 8 and 9, an intermediate pulley support bracket 72 is mounted integrally with the cutter housing 7 near the bracket 26 located on the right front side of the cutter housing 7. A support shaft 73 protrudes vertically upward from a bottom piece 72a of the intermediate pulley support bracket 72, and a sleeve portion 74a of a pulley support arm 74 is mounted on the support shaft 73.
And a pulley support shaft 75 protruding upward from the bottom piece 72a of the intermediate pulley support bracket 72, and a pulley support shaft 76 protruding above the pulley support arm 74. The intermediate pulley 77 and the intermediate idler pulley 78 are rotatably fitted to each other, and the pulley support arm 74 is urged clockwise in FIG. 4 around the support shaft 73 by a spring (not shown).

Further, an impeller driven pulley 79 having a diameter larger than that of the impeller drive pulley 71 is integrally fitted to the outer end of the impeller rotating shaft 52 integrated with the centrifugal blower impeller 15 for discharging grass clippings and the centrifugal blower impeller 17 dedicated to blowing. The intermediate pulley 80, the pulley support shafts 53, 54 provided on the inwardly bent mounting piece 47 at the front end of the impeller support bracket 46
81 is rotatably fitted, and an impeller drive pulley 71 integrated with the cutting blade shaft 25r of the right lawn grass cutting blade 9r, an intermediate pulley 77, an intermediate idler pulley 78, and intermediate pulleys 80 and 81.
And the impeller driven pulley 79 and the fan V belt 82
When the right lawn mowing blade 9r rotates,
The centrifugal blower impeller 15 for discharging grass clippings and the centrifugal blower impeller 17 dedicated to air blowing are driven to rotate counterclockwise in FIGS. 8 and 14 (clockwise in FIG. 11).

Further, as shown in FIGS. 4 and 9, the sleeve portion 74a of the pulley support arm 74 fitted to the support shaft 73 projecting upward from the bottom piece 72a of the intermediate pulley support bracket 72 is shown. A pulley 78 of a pulley support shaft 76 provided on a pulley support arm 74 pivotably supported on a support shaft 73 of an intermediate pulley support bracket 72 is fitted with a coil spring that is not As shown in FIG. 4, the fan V-belt 82 is urged clockwise by a spring force to apply tension to the fan V-belt 82.

Also, the air inlet 12 of the centrifugal blower 16 dedicated to the blower.
An inlet cover 83 made of a perforated plate is fitted to the ends of the cover mounting shafts 55 and 56 of the impeller support bracket 46 so as to cover the shaft b, and is screwed to the cover mounting shafts 55 and 56. A suction port cover 83 is integrally attached to the impeller support bracket 46 by a nut (not shown).

When the centrifugal blower housing 10 is mounted on the cutter housing 7, the top piece 72b of the intermediate pulley support bracket 72 is mounted as shown in FIG.
And the female screw portion 84, on the top piece 49a of the front folded reinforcing piece 49.
As shown in FIG. 1, the female screw portion 85 extends through the front and rear top pieces 86a and 86b of the belt cover 86 as shown in FIG.
A belt cover 86 is detachably attached to the intermediate pulley support bracket 72 and the front folding back piece 49 with screws 87 screwed to 84 and 85, and the belt cover 86 allows the intermediate pulley 77 of the intermediate pulley support bracket 72 to be detached. The fan V-belt 82 bridged between the intermediate idler pulley 78 and the intermediate pulleys 80 and 81 of the front folded reinforcing piece 49 is protected.

Further, as shown in FIG. 8, an arc-shaped belt falling-off prevention member 88 is supported on the outer periphery of the impeller driven pulley 79 integrated with the centrifugal blower impeller 15 for discharging grass clippings and the centrifugal blower impeller 17 dedicated to blowing. As shown in FIGS. 4 and 9, a belt falling-off prevention member 89 is also provided on the outer periphery of the intermediate pulleys 80 and 81, and the impeller drive pulley 71, the intermediate pulley 77, and the intermediate idler pulley are mounted on the bracket 46. The belt 78 also has a belt drop prevention member (not shown) similar to the belt drop prevention members 88 and 89.

The embodiment shown in FIGS. 1 to 16 is configured as described above, so that the internal combustion engine 6 is started to drive the riding lawn mower 0, and the rotation of the output shaft 60 causes the belt to rotate. With the turfgrass cutting blade 9, the turfgrass discharge centrifugal blower impeller 15 and the blower-dedicated centrifugal blower impeller 17 being rotationally driven via the transmission mechanism, the cutter housing lifting / lowering operating material 37 that has been tilted upward is tilted downward. And the cutter housing 7 that was separated from the ground
Is lowered to be supported on the ground by the auxiliary wheels 27, and the cut grass cut by the rotation of the grass cutting blade 9 is moved up by the jumping wings 9a (see FIG. 4) attached to the grass cutting blade 9. After being lifted inward and upward, it is pushed into the cutter housing-side suction duct 11 together with the air flowing from between the lower end edge 23a of the peripheral wall 23 of the cutter housing 7 and the ground, and the impeller 15 of the centrifugal blower 15 for discharging grass clippings. With the suction negative pressure, the cut grass discharge port 8 of the cutter housing 7
The centrifugal blower housing 10 is sucked into the cut grass blower centrifugal blower 14 through the cutter housing side suction port 12a of the centrifugal blower housing 10 and is conveyed from the cut grass lawn grass centrifugal blower 14 to the glass bag unit 19 through the communication duct 18; The cut grass is separated and collected in the glass bag 21 of the glass bag unit 19.

At this time, the grass turf released from the outlet 13a of the centrifugal blower for discharging grass turf grass by the intake air sucked from the centrifugal blower 16 dedicated to blasting blows the grass bag unit 19.
The grass is prevented from being clogged in the communication duct 18 and the suction duct 20, and the grass is securely transported to the glass bag unit 19.

As shown in FIG. 10, the lower portion of the cutter housing side suction port 12a is
Open to the bottom of the centrifugal blower impeller 15
As a result of the increase in the diameter of the inlet portion, even if the peripheral speed U _1A at the inlet of the centrifugal blower impeller 15 for discharging grass clippings is higher than the peripheral speed U _1B at the inlet of the centrifugal blower impeller 17 for blowing only, Because the diameter of the outlet of the centrifugal blower impeller 15 is larger than the diameter of the outlet of the centrifugal blower impeller 17 dedicated to the blower, the peripheral speed U _{2A at} the outlet of the centrifugal blower impeller 15 for discharging the lawn grass is the outlet of the centrifugal blower impeller 17 dedicated to the blower. _Is larger than the peripheral speed U _2B of For this reason, the total pressure at the outlet of the centrifugal blower impeller 15 for discharging grass clippings is equal to or higher than the total pressure at the outlet of the centrifugal blower impeller 17 dedicated to blowing. Further, since the centrifugal blower impeller 15 for discharging grass clippings is a backward facing blade,
As is clear from the theory of the centrifugal blower, its reaction degree _RA
Is

(Equation 3) Degree of recoil R of centrifugal blower impeller 17 only for blowing forward-facing blades
_B

(Equation 4) And therefore, as is apparent from Equations 3 and 4, the static pressure rise p of the centrifugal blower impeller 15 for discharging grass clippings
_thA is the static pressure rise p of the centrifugal blower impeller 17 dedicated to ventilation.
_thB , the phenomenon that the air discharged from the blower-only centrifugal blower 16 bypasses the discharge port 13a of the cut grass turf grass discharge centrifugal blower 14 is avoided, and the air urged by the cut grass turf grass discharge centrifugal blower 14 is avoided. With the dynamic pressure, the transfer of the cut grass to the glass bag unit 19 is promoted.

Although the blowing air flow rate hardly changes due to the series operation of the jumping blade 9a and the centrifugal blower 14 for discharging grass clippings, the blowing air pressure increases, and the discharge air 13 and the communication duct 18 are increased by the increase of the blowing air pressure. In addition, the cut grass in the suction duct 20 is hardly clogged.

Further, in addition to the series operation of the jumping blade 9a and the centrifugal blower 14 for discharging grass clippings and the parallel operation of the centrifugal blower 16 dedicated to blowing, the blowing air pressure is reduced by the blowing blade 9a and the centrifugal blower for discharging grass clippings. Although the airflow pressure is substantially the same as the airflow pressure in the serial operation state with the blower 14, the airflow volume is greatly increased, and a large amount of cut grass can be reliably transported to the glass bag unit 19 by the increase in the airflow volume.

Further, the impeller driven pulley 79 connected to the centrifugal blower 14 for discharging grass and grass and the centrifugal blower 16 for blowing only has a larger diameter than the impeller drive pulley 71 directly connected to the grass cutting blade 9. The centrifugal blower impeller 17 for the blower of the lawn grass discharge centrifugal blower 14 and the blower-specific centrifugal blower 16 rotates at a lower speed than the lawn grass cutting blade 9, and the noise level of the lawn grass release centrifugal blower 14 and the blower-only centrifugal blower 16. Decrease.

Further, the diameter and the blade width of the centrifugal blower impeller 15 for discharging grass clippings are determined by the centrifugal blower impeller 17 dedicated to blowing.
Are larger than the diameter and the blade width of the cut grass, respectively, even if the number of blades of the centrifugal blower impeller 15 for cutting grass is smaller than the number of blades of the centrifugal blower impeller 17 dedicated to blowing, The blowing flow rate is larger than the blowing flow rate of the blower-specific centrifugal blower 16, so that the mixed air of cut grass and grass can be sufficiently blown to the glass bag unit 19.

Moreover, the centrifugal blower impeller 15 for discharging grass clippings
As shown in FIG. 14, the blade outlet angle α of the blade is an acute backward blade, so that the centrifugal action of the blade of the impeller 15 of the centrifugal blower for discharging grass clippings works sufficiently to obtain a large static pressure rise. As a result, detour of air from the outer peripheral portion of the centrifugal blower for blower impeller 17 to the outer peripheral portion of the centrifugal blower for discharging grass clippings is more reliably prevented.

The blade outlet angle β of the blower-specific centrifugal blower impeller 17 is an obtuse forward blade as shown in FIG.
Even if the peripheral speed of the centrifugal blower 15 for discharging grass is lower than the peripheral speed of the centrifugal blower 15 for discharging grass, the outlet 13 of the impeller 17
The air flow in the vicinity of b is accelerated at a relatively high speed to obtain a relatively large dynamic pressure and air volume, and the centrifugal blower 14 for discharging grass clippings removes the grass clippings that are sucked from the cutter housing 7 and discharged to the discharge port 13a. The conveyance is promoted by the air volume obtained by the centrifugal blower 16 dedicated to the blowing and the relatively large dynamic pressure.

Further, since the suction port 12 of the blower-specific centrifugal blower 16 is covered with a suction port cover 83 having a large number of small holes, a large suction resistance is not generated.
The suction port cover 83 prevents foreign substances from being sucked into the glass bag unit 19 beforehand.

Further, a centrifugal blower impeller 15 for discharging grass clippings
And the centrifugal blower impeller 17 dedicated to the blower are pivotally supported in the common centrifugal blower housing 10, and the centrifugal blower impeller 15 for discharging the cut grass and the centrifugal blower impeller 17 dedicated to the blower are integrated, so that the grass discharge is performed. The centrifugal blower 14 for use and the centrifugal blower 16 dedicated to the blower have greatly simplified structures, are reduced in weight, and can be reduced in cost.

Further, in the centrifugal blower housing 10, a separator 59 is disposed on the outer periphery of the centrifugal blower impeller 17 dedicated to air blowing and near the centrifugal blower impeller 15 for discharging grass clippings. As shown in FIG. 11, since the cutout is cut off on the discharge port 13 side of the centrifugal blower housing 10, the outer peripheral portion of the centrifugal blower impeller 15 for discharging grass clippings and the outer peripheral portion of the centrifugal blower impeller 17 dedicated to the blowing are mutually connected. The flow is interrupted, and the interference of the air flow between the centrifugal blower for discharging grass clipping grass 14 and the centrifugal blower dedicated to blowing air 16 is avoided, and the air is smoothly discharged from the centrifugal blower for discharging grass clipping grass 14 and the centrifugal blowing fan dedicated to blowing air respectively. It is possible to flow out to the communication duct 18 through 13a and 13b, and the grass mixed with the air does not catch on the separator 59.

Further, the centrifugal blower housing 10 can be connected to or separated from the cutter housing 7 by inserting or removing the hinge shafts 44, 45, so that the centrifugal blower housing 10 can be easily connected to the cutter housing 7. In addition, maintenance and inspection of the centrifugal blower 14 for discharging grass clippings and the centrifugal blower 16 dedicated to blowing in the centrifugal blower housing 10 can be easily performed.

Further, with the internal combustion engine 6 stopped and the hinge shaft 45 inserted into the shaft fitting sleeves 39 and 43, the hinge shaft 44 is removed from the shaft fitting sleeves 38 and 42, and the screw 87 is removed to remove the belt. If the cover 86 is removed and the communication duct 18 is removed from the centrifugal fan housing 10, the centrifugal fan housing
4 rotates counterclockwise in FIG. 4 about the front hinge shaft 44, and the cut grass discharge port 8 of the cutter housing 7 and the cutter housing side suction port 11 of the centrifugal blower housing 10 are opened. Since the centrifugal blower impeller 15 for discharging grass and grass and the centrifugal blower impeller 17 dedicated to blowing can rotate freely, the cutter housing 7
The state of the lawn grass in the inside and the centrifugal blower housing 10 can be observed, and the lawn grass clogged in the cutter housing 7 and the centrifugal blower housing 10 can be easily removed.

[Brief description of the drawings]

FIG. 1 is a perspective view of a lawn mower equipped with a lawn mower grass transport device of the present invention as viewed obliquely from the front right.

FIG. 2 is a perspective view of the lawn mower of FIG.

FIG. 3 is a plan view of the cutter housing according to the embodiment of the present invention shown in FIG. 1;

FIG. 4 is a plan view of the cutter housing and the centrifugal blower housing of the embodiment.

FIG. 5 is a side view of the cutter housing and the lifting mechanism of the cutter housing in a state where the embodiment is lifted upward.

FIG. 6 is a side view of the cutter housing and the elevating mechanism of the cutter housing in a state where the embodiment is lowered.

FIG. 7 is a right side view of the cutter housing and the centrifugal blower housing.

FIG. 8 is a right side view of the cutter housing and the centrifugal blower housing with a suction port cover and a belt cover removed.

FIG. 9 is a front view of a cutter housing and a centrifugal blower housing.

FIG. 10 is a longitudinal sectional front view taken along the line XX of FIG. 8;

11 is a longitudinal sectional side view of a state cut along the line XI-XI in FIG. 4;

FIG. 12 is a plan view illustrating a state in which an engine V belt, a cutter V belt, and a fan V belt are bridged.

FIG. 13 is a front view illustrating a state in which an engine V belt, a cutter V belt, and a fan V belt are bridged.

FIG. 14 is a view taken in the direction of arrows XIV-XIV in FIG. 4;

FIG. 15 is a perspective view of a main part of a centrifugal blower impeller for discharging grass clippings.

16 is a sectional view taken along the line XVI-XVI in FIG.

[Explanation of symbols]

0: riding lawn mower, 1: lawn mower body, 2: front wheel, 3
... rear wheel, 4 ... seat, 5 ... steered wheel, 6 ... internal combustion engine, 7 ...
Cutter housing, 8: grass cutting grass discharge port, 9: grass cutting blade, 10: centrifugal blower housing, 11: suction duct on cutter housing side, 12: suction port, 13: discharge port, 14: centrifugal blower for cutting grass release, 15 ... impeller, 16 ... centrifugal blower dedicated to air blowing, 17 ... impeller, 18 ... communication duct, 19 ... glass bag unit, 20 ... suction duct, 21 ... glass bag, 22 ...
Top wall, 23 ... peripheral wall, 24 ... cutting blade pivot hole, 25 ... cutting blade shaft, 26 ... bracket, 27 ... auxiliary wheel, 28, 29 ... mounting pieces, 30, 31 ...
Elevating link, 32, 33 ... mounting piece, 34 ... horizontal rod, 35 ... connecting member, 36 ... tilting rod, 37 ... cutter housing elevating operation material, 38, 39 ... shaft fitting sleeve, 40, 41 ... bracket, 4
2, 43 ... shaft fitting sleeve, 44, 45 ... hinge shaft, 46 ... impeller support bracket, 47, 48 ... inward bent mounting piece, 49
... Fold-back reinforcement piece, 50 ... Pulley support piece, 51 ... Impeller pivotal support sleeve, 52 ... Impeller rotating shaft, 53,54 ... Pulley support shaft, 55,56 ... Cover mounting support shaft, 57,58 ... Protrusion, 59…
Separator, 60 ... Output shaft, 61 ... Power take-out pulley, 62 ...
Pulley, 63… Driven pulley, 64… Drive pulley, 65
... Engine V-belt, 66 ... Pulley support arm, 67 ... Idler pulley, 68 ... Pulley support arm, 69 ... Cutter pulley, 70 ... Cutter V-belt, 71 ... Impeller drive pulley, 72 ... Intermediate pulley support bracket, 73 ... Support shaft 74, pulley support arm, 75, pulley support shaft, 76, pulley support shaft, 77, intermediate pulley, 78, intermediate idler pulley, 79, impeller driven pulley, 80, 81, intermediate pulley, 82, fan V belt, 83 … Suction port cover, 84, 85… Female screw part, 86
... belt cover, 87 ... screw, 88, 89 ... belt falling prevention member, 90, 91 ... coil spring.

Continuation of the front page (72) Inventor Yasuji Hashimoto 1-4-1 Chuo, Wako-shi, Saitama In-house Honda R & D Co., Ltd. (56) References JP-A-8-275648 (JP, A) JP-A-6- 311814 (JP, A) Japanese Utility Model Application 4-106923 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) A01D 34/00-34/90

Claims (4)

(57) [Claims] 1. A cut grass grass discharge centrifugal blower is connected to a cut grass grass discharge outlet of a cutter housing provided in a lawn grass mower main body, and a dedicated blower centrifugal blower is provided in parallel with the cut grass grass discharge centrifugal blower. In the lawn mower, the outlets of the centrifugal blower for discharging grass and grass and the centrifugal blower dedicated to air blowing are connected to a grass-grass grass conveying duct, and the rotation axes of both centrifugal blowers are oriented horizontally. By the driven motor, the centrifugal blower for discharging grass and grass and the centrifugal blower for blowing only are driven to rotate in the same direction, and the impeller outer diameter of the centrifugal blower for discharging grass and grass is larger than the impeller outer diameter of the centrifugal blower for blowing only. A grass-grass-grass-conveying device characterized by being set to: 2. A lawn grass conveying apparatus according to claim 1, wherein a blade for conveying lawn grass is attached to a lawn blade in the cutter housing. 3. The cutter housing according to claim 1, wherein a lower portion of a suction port of the centrifugal blower for discharging grass clippings is opened in the cutter housing adjacent to an outer peripheral lower portion of an impeller of the centrifugal blower for discharging grass clippings. 3. The grass turf grass conveying device according to claim 1. 4. A centrifugal blower dedicated to air blowing is provided outside the body of the lawn mower opposite to a suction port of the centrifugal blower for discharging grass clippings, and a suction port of the centrifugal blower dedicated to blowing air is connected to the lawn mower. The air outlet of the centrifugal blower dedicated to the blower is opened toward the outside of the blower main body, and the suction port of the blower is covered with a cover having a number of small holes. Grass turf grass transport equipment.