JP2000060261A - Mower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mower in which three blades capable of being rotated on vertical shafts, respectively, are arranged laterally in parallel in a deck and which is formed so as to rotate the central blade and one of the lateral side blades in the same direction, rotate the other in the reverse direction, join grasses cut using the central blade and the side blade to the grasses cut using the other side blade and subsequently backward discharge the joined cut grasses from an exit formed at a laterally central site in the rear portion of the deck, capable of efficiently joining right and left grass-carrying winds to discharge the cut grasses. SOLUTION: The inner surface of a deck is formed so that the cross-sectional area of a flowing route Ra of grasses cut using a central blade 15a and one 15b of lateral side blades is larger than that of a flowing route Rb of grasses cut using the other 15c, and a difference is given between both the height of the route Ra and the height of the route Rb at their joining point.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has three blades, which are rotationally driven about a vertical axis, arranged in parallel in the deck in the left-right direction, and a central blade and a lateral one blade are rotated in the same direction. In addition to driving the blades on the other side in the opposite direction, combine the grass cut by the center blade and the blade on the one side with the grass cut by the blades on the other side to join the deck. The present invention relates to a mower configured to discharge backward from an outlet formed at a left-right intermediate portion in a rear part.

[0002]

2. Description of the Related Art A mower having the above structure is provided between front and rear wheels of a traveling vehicle body, and cuts grass discharged from an outlet is sent to the rear of the machine through a duct provided between the left and right rear wheels. It is used in the form of collecting it in the grass collection container connected to the rear part, and it is possible to pass the duct for guiding the cut grass from the mower to the grass collection container without deploying it on the lateral outside of the machine. Therefore, it is effective in reducing the width of the entire body including the duct.

[0003]

In the mower having the above-mentioned structure, the central blade and the grass cut by the blade on one side, and the grass cut by the blade on the other side,
Since it is carried by the wind generated by the rotation of the blade, it is important to combine the carried winds without loss in order to efficiently discharge the cut grass.

It is an object of the present invention to allow the left and right carrying winds of a mower of such a type to join together without loss so that grass can be efficiently discharged.

[0005]

[Means for Solving the Problems] [Structure, Action and Effect of the Invention According to Claim 1]

(Structure) In the mower of the invention according to claim 1, three blades which are rotationally driven about the longitudinal axis are arranged in parallel in the left and right in the deck, and the central blade and the lateral one side blade are arranged. Rotate in the same direction, and drive the blades on the other side in the opposite direction to join the grass cut by the center blade and the one blade on the side with the grass cut by the blade on the other side. Thus, in the mower configured to discharge backward from the outlet formed in the left and right intermediate portion in the rear part of the deck, the cross-sectional area of the flow path of the grass cut by the central blade and the horizontal one side blade is The inner surface of the deck is formed so as to be larger than the cross-sectional area of the flow passage of the mowing grass cut by the blade, and both flow passages are provided with a difference in height at the confluence.

(Operation) According to the above-mentioned structure, the grass cut by the central blade and the blade on one side that are rotated in the same direction is carried by the wind generated by each blade and headed for the exit. The grass cut by the blade on the other side is carried by the wind generated by the blade to the outlet. At this time, the grass cut by the central blade and the blade on one side is merged and the transport amount increases, but
Wind force is smoothly transmitted to the outlet through the flow passage having a large cross-sectional area. In addition, the flow of mowed grass cut by the blade in the center and the blade on one side, and the flow of mowed grass cut by the blade on the other side on the other side merge due to the difference in height, so the left and right transport air flows. It is less likely that the carrier energy will be lost due to collision.

(Effect) Therefore, according to the first aspect of the present invention, by carrying the wind force through the flow passage having the cross-sectional area corresponding to the amount of the cut grass, a smooth transfer without stagnation or stall is performed. , The right and left mowing grass flows can be merged with a step to reduce the loss due to collision and can be guided to the exit, which is effective in smoothly carrying the mowing grass to the grass container through the duct. .

[Structure, Action and Effect of the Invention According to Claim 2]

(Structure) In the mower of the invention according to claim 2, in the invention of claim 1, the central blade is located rearward of the left and right blades with respect to the cutting forward direction.

(Operation / Effect) According to the above construction, the angle formed between the left and right flow passages and the passage toward the outlet becomes large, the direction of the conveying air is changed more smoothly, and the cutting grass removal performance is further improved. Become.

[Structure, Action and Effect of the Invention According to Claim 3]

(Structure) The mower of the invention according to claim 3 is the mower according to claim 1 or 2, wherein the blade is located at an intermediate portion between the central blade and a blade on one lateral side which is rotationally driven in the same direction as the blade. On the inner surface of the deck, there is provided a gently sloping guide portion in which the upper hand side of rotation is lower than the lower hand side with respect to the central blade.

(Operation) According to the above-mentioned structure, when the one lateral side passes through the flow passage, the turbulence of the wind at the rear edge of the flow passage is reduced and the grass cut by this blade is smoothed. It can be guided to the central blade side of the flow passage, and when the central blade plunges into the flow passage, the wind generated by this blade is guided to the flow passage by the side surface of the guide part, and the blade side on the horizontal one side. It is suppressed to escape to.

(Effect) Therefore, according to the invention of claim 3, in addition to the effect of claim 1 or 2, the central blade and the blade on one lateral side which is driven to rotate in the same direction as the blade are provided. The grass weeded by
Wind power can be efficiently conveyed along the flow passage.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 shows the entire mower. This mower comprises a mower 4 which can be lifted up and down on the lower abdomen of a traveling vehicle body 3 having front wheels 1 and rear wheels 2, and a grass collection container 5 for collecting grass clippings which is connected to the rear portion of the vehicle body. ing.

An engine 6 is mounted on the front portion of the traveling vehicle body 3, and its output is axially transmitted to a hydrostatic continuously variable transmission (HST) 7 arranged at the rear portion of the vehicle body. The gears are decelerated and transmitted to the differential device 9, from which the left and right differential transmission shafts 10a, 10
The power taken out via b is further decelerated by the left and right deceleration cases 11a and 11b, and the left and right axles 12a and 12b.
To be transmitted to.

Here, the mission case 8 is arranged so as to be offset to the left with respect to the traveling vehicle body 3, the left deceleration case 11a is directly connected to the side surface of the mission case 8, and the right deceleration case 11b is the mission. The differential transmission shafts 10a and 10b on the right side, the transmission case 8, which are connected and supported by the vehicle body frame 13 at a position apart from the case 8,
Also, a large space is formed between the deceleration case 11b on the right side.

The mower 4 includes a deck 16 having three blades 15a, 15b and 15c which are rotationally driven about a vertical axis.
It is configured to be arranged in parallel on the left and right inside, and is connected to the engine 6 through a belt transmission mechanism 17 in a linked manner.
The power of the TO shaft 18 is transmitted to the input case 20 on the deck 7 via the transmission shaft 19, and the central blade 15a is directly axially driven directly below the input case 20, and
The central blade 15a and the left and right blades 15 are wound around and interlocked with the belt 21. Then, in plan view, the central blade 15a and the left blade 15b are rotated in the clockwise direction, and the right blade 15c is rotated in the counterclockwise direction, so that the blades 15a, 15b, 15
The mowed grass conveyed by the wind action of c is collectively discharged from the outlet 16a formed at the rear portion of the deck 16.

From the left end of the front part of the deck 16 to the center, there is a flow passage Ra through which the grass mowed by the left blade 15b and the central blade 15a is conveyed by the wind generated by the blades 15b and 15a. In addition to being bulged, a flow passage Rb is bulged from the right end of the front portion of the deck 16 to the center thereof, and the grass cut by the right blade 15c is conveyed by wind. Further, the left flow passage Ra that conveys the cut grass from the two blades is bulged more than the right flow passage Rb that conveys the cut grass from the one blade, and both flow passages Ra, Rb The flow of the mowed grass conveyed through the is merged with a step and heads for the outlet 16a.

Further, the left blade 15b and the central blade 1
A guide portion 14 is projectingly provided on the inner surface of the deck corresponding to the intermediate portion of 5a. The guide portion 14 includes a central blade 15
When the left blade 15b passes through the flow passage Ra, the turbulence of the wind at the rear edge e of the flow passage Ra is formed when the left blade 15b passes through the flow passage Ra. The blade 15a can be smoothly guided to the right side of the flow passage Ra by cutting the cut grass by the left blade 15b, and when the central blade 15a plunges into the flow passage Ra, this blade 15a generates The generated wind is guided by the right side surface of the guide portion 14 and smoothly guided to the flow passage Ra.

In the space formed on the right side of the lower part of the vehicle body, a duct 22 is provided for guiding the cut grass carried out from the outlet 16a of the mower 4 to the grass collecting container 5. The duct 22 has a rectangular cross-sectional shape, the bottom surface thereof is formed in a mountain shape, and the top portion of the mountain shape is located near the upper portion of the right differential transmission shaft 10b.

A switch 23 as a clogging detecting means for detecting that a pressure higher than a set value is applied is provided at a position above the mountain top of the duct 22.

The grass container 5 is composed of an air permeable container whose front end is entirely open, and is vertically rocked around an upper fulcrum a on a support frame 25 erected at the rear end of the vehicle body frame 13. Connected as possible. The support frame 25 is provided with a wall surface 26 that closes the front end opening of the grass container 5 that has been rotated downward, and the rear end of the duct 22 projects into the center of the wall surface 26. Air vents 27 are formed on the left and right of the wall surface 26.

A fulcrum bracket 31 is provided on the lower left and right sides of the support frame 25 so as to be rotatable around a fulcrum b, and a hydraulic cylinder 32 is pivoted over the fulcrum bracket 31 and the upper front end of the grass container 5. By being supported and connected, the hydraulic cylinder 32 contracts, and the grass container 5 descends, so that the grass container working posture is received and supported by the front end of the container, and the hydraulic cylinder 32 extends to operate. Is swung up so that the front end of the container is in a discharging posture with the opening downward.

A hook-shaped lock fitting 33 extends rearward from the fulcrum bracket 31 and a lock pin 34 is engaged with the lower part of the front end of the grass container 5 from above. Is provided.
As described above, the hydraulic cylinder 32 contracts and the grass container 5
When the hydraulic cylinder 32 is further contracted with the front end of the support frame 25 received by the support frame 25, the cylinder connection point c of the fulcrum bracket 31 is lifted upward around the fulcrum b, whereby the lock fitting 33 is moved around the fulcrum b. The grass collection container 5 is rotated downward and engaged with the lock pin 34, and the grass collection container 5 is fixed (locked) in the grass collection work posture. Further, when the hydraulic cylinder 32 starts the extension operation from this grass collecting work posture, the fulcrum bracket 3 is caused by the extension reaction force of the initial operation.
The cylinder connecting point c of No. 1 is pushed downward around the fulcrum b, whereby the lock fitting 33 is pivoted upward around the fulcrum b and released from the lock pin 34, and the grass container 5 is unlocked and continues. The grass container 5 is swung up and rotated as the hydraulic cylinder 32 extends.

On the left side of the driver's seat 41 provided at the rear part of the traveling vehicle body 3, there is provided a PTO clutch lever 42 which can swing back and forth around a fulcrum d. The PTO clutch lever 42 has a base metal fitting 42a and the belt. The tension clutch type PTO clutch 43 provided in the transmission mechanism 17 is linked with the wire, and the PTO clutch 43 is "disengaged" when the PTO clutch lever 42 is pulled up.
The PTO clutch 43 is "engaged" when the O-clutch lever 42 is tilted forward.

The intermediate rotation link 44 attached to the support frame 25 so as to be rotatable around the fulcrum e, and the PTO.
The check pin 45 provided on the base metal member 42a of the clutch lever 42 is linked by a check link 47 having an elongated hole 46, and the intermediate rotation link 44 and the upper end of the front end of the grass container 5 are linked by a link 48. The PTO clutch lever 42 is restrained by the rotation of the grass container 5.

That is, as shown in FIG. 11, when the PTO clutch lever 42 is in the clutch “disengaged” position, the check pin 45 is positioned in front of the elongated hole 46 of the check link 47 and in front of the check link 47. The movement is allowed, and the check link 47 freely moves back and forth as the grass container 5 swings up and down. Further, as shown in FIG. 9, when the grass container 5 is in the grass collecting work posture, the PTO clutch lever 42 can be arbitrarily operated in the range between the clutch “disengaged” position and the clutch “engaged” position.

Then, as shown in FIG. 9, when the PTO clutch lever 42 is in the clutch "engaged" position, the check pin 45 is located near the rear end of the elongated hole 46 of the check link 47. Therefore, when the grass container 5 is swung up and rotated while the PTO clutch 43 is engaged, the check link 47
Is moved forward by the hydraulic driving force to move the check pin 45 into the long hole 4
6, the PTO clutch lever 42 in the clutch "engaged" position is forcibly operated to the clutch "disengaged" position as shown in FIG.

With such a structure, when the grass container 5 is swung up while the mower 4 is being rotationally driven, the drive of the mower 4 is automatically cut off and the duct 2 opened.
It is designed to prevent grass and dust from being scattered from the rear end of the rear part 2.

[Other Embodiments] As shown in FIG. 13, when the central blade 15a is arranged rearward of the left and right blades 15b, 15c, the left and right flow passages R are formed.
The direction change angle in the passage extending from a, Rb to the outlet 21 becomes larger than that in the previous example, the direction change of the transport wind becomes smoother, and the cut grass carry-out performance is improved.

[Brief description of drawings]

[Figure 1] Overall side view of the mower

FIG. 2 is a plan view of mower.

[Figure 3] Rear view of the vehicle body

[Fig. 4] Rear view of the longitudinal section of mower

[Figure 5] Vertical side view of mower

FIG. 6 is a rear view of a longitudinal section of a mower showing a flow path of cut grass.

FIG. 7 is a cross-sectional plan view of the mower showing the flow path of the cut grass.

FIG. 8 is an external perspective view of the mower.

FIG. 9 is a side view showing a linked state of the clutch operation unit and the grass container opening / closing unit in the PTO clutch engaged state.

FIG. 10 is a side view of the grass container opening / closing section showing an initial state of opening the grass container.

FIG. 11 is a side view of the grass container opening / closing part showing a state where the grass container is opened.

FIG. 12 is a front view showing the entrance of the grass container.

FIG. 13 is a cross-sectional plan view of the mower according to another embodiment.

[Explanation of symbols]

14 Information 15a central blade 15b Horizontal blade 15c Blade on the other side 16 decks 16a exit Ra flow passage Rb flow passage

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hiroki Nagai             64 Ishizukitamachi, Sakai City, Osaka Prefecture Kubo Co., Ltd.             Ta Sakai Factory (72) Inventor Kazuaki Kurohara             64 Ishizukitamachi, Sakai City, Osaka Prefecture Kubo Co., Ltd.             Ta Sakai Factory (72) Inventor Yoshio Tomiyama             64 Ishizukitamachi, Sakai City, Osaka Prefecture Kubo Co., Ltd.             Ta Sakai Factory (72) Inventor Hiroshi Kawabata             64 Ishizukitamachi, Sakai City, Osaka Prefecture Kubo Co., Ltd.             Ta Sakai Factory (72) Inventor Hiroshi Oshima             64 Ishizukitamachi, Sakai City, Osaka Prefecture Kubo Co., Ltd.             Ta Sakai Factory (72) Inventor Katsuhiko Uemura             64 Ishizukitamachi, Sakai City, Osaka Prefecture Kubo Co., Ltd.             Ta Sakai Factory F term (reference) 2B083 BA18 EA15 FA11 FA16 FA17                       GA01

Claims (3)

[Claims] 1. The three blades, which are driven to rotate about the longitudinal axis, are arranged in parallel in the deck in the left-right direction, the central blade and the lateral one side blade are rotated in the same direction, and the lateral other side. Drive the blade in the opposite direction, and the grass cut by the blade in the center and the blade on one side,
Join the grass that was cut with the blade on the other side,
In a mower configured to discharge backward from an outlet formed in the middle part on the left and right of the rear part of the deck, the cross-sectional area of the flow passage of the grass cut by the blade in the center and the blade on one side is The mower is characterized in that the inner surface of the deck is formed so as to be larger than the cross-sectional area of the flow passage of the cut grass, and the height of both flow passages at the confluence is different. 2. The mower according to claim 1, wherein the central blade is located rearward of the left and right blades in the cutting forward direction. 3. The inner surface of the deck at an intermediate portion between the central blade and the blade on one lateral side that is driven to rotate in the same direction as the central blade has a rotation upper side higher than a lower side than the lower side. The mower according to claim 1 or 2, wherein a guide portion having a gentle inclination which becomes lower is provided in a protruding manner.