JPH08322361A - Mower - Google Patents

Abstract

PURPOSE: To provide a mower, having a front wheel offset in the same direction as that of cutting blades, capable of reducing a load on an operator without installing a special member for balancing the left and right weights and causing the front and rear wheels to run off the top surface of a ridge and improved in straight advance runnability. CONSTITUTION: This mower is obtained by installing two of a front wheel 3 and a rear wheel 4 and cutting blades between the front and rear wheels in a car body frame 2, offsetting the cutting blades 22 from the shaft center in the travel direction of the car body frame 2 passing through the rear wheel 4 to one side and offsetting the front wheel 3 in the same direction as that of the cutting blades 22. Furthermore, the side of the rear wheel 4 of the mower 1 is preferably heavier than the side of the front wheel 3.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to improvements in mowers.

[0002]

2. Description of the Related Art As a measure to reduce labor for rice cultivation, an attempt has been made to replace mowing of ridges with human power, for example, Japanese Patent Laid-Open No. 6-276825 "Mowing Machine and Angle Adjusting Device and Swing Control Device". Yes, FIG. 1 and FIG. 5 of the publication
According to the method, a cutter base 2 is attached to a frame F (corresponding to a vehicle body frame), and a variable cutter base 3 is hinge-connected to the cutter base 2, and the cutter base 2 has ridges. A rotary blade 43 (corresponding to a flat blade) for cutting the upper surface of the rotary cutter is stored, and a rotary blade 43a (corresponding to a slope blade) for cutting the slope of the ridge is stored in the variable cutter base 3. That is, the frame F has guide wheels 21 (corresponding to front wheels).
And a traveling wheel 10 (corresponding to a rear wheel) and rotary blades 43, 43a between the guide wheel 21 and the traveling wheel 10, and the rotary blade 43a is offset from the axis of the frame F in the traveling direction to one side. is there. The variable cutter base 3 is provided with guide wheels 31.

[0003]

Generally, when mowing the upper surface and slope of a ridge at the same time with a mowing machine, in order to eliminate uncut residue, a constant interval between the slope of the ridge and the rotary blade 43a is required. Good. For that purpose, it is necessary to run the mower along the corner of the ridge, and the operator operates the guide wheel 21 as a guide for steering so that the distance between the corner of the ridge is constant. It is easier to keep the intervals constant by bringing the ridges as close as possible to the corners of the ridges. However, if the guide wheel 21 is brought closer to the corner of the ridge, the traveling wheel 10 is also brought closer,
There is a greater risk of derailing from the upper surface of the ridge. Since it must be operated so that it does not occur, the burden on the operator becomes extremely large. Particularly, in the configuration in which the rotary blade 43a is offset from the axis of the frame F in the traveling direction to the slope side of the ridge as in the above-described conventional technique, straight running can be performed when the left and right weight balance of the mower is biased. It is not easy, and the burden on the operator is further increased. On the other hand, when the cutting blade is offset from the traveling direction axis of the body frame in both the one-sided mower and the two-sided mower, the left and right weights of the mower should be well balanced to improve straight running performance. It is necessary to consider such as.

The object of the present invention is to reduce the burden on the operator without the front and rear wheels stepping off from the upper surface of the ridge when the mowing machine travels along the corners of the ridge, and the left and right weights of the mowing machine. It is to improve straight running performance without providing a special member for balancing.

[0005]

In order to achieve the above object, the present invention provides a vehicle body frame having two wheels, a front wheel and a rear wheel, and a front wheel.
In a mowing machine having a cutting blade between the rear wheels and offsetting the cutting blade to one side from the running direction axis of the vehicle body frame passing through the rear wheels, the front wheel is offset in the same direction as the cutting blade. Characterize.

[0006] Preferably, the rear wheel side of the mower is heavier than the front wheel side.

[0007]

[Function] When the mower is driven along the ridge corner, only the front wheel that guides the steering wheel operation can be brought close to the ridge corner, so there is a risk that the front and rear wheels will come off the upper surface of the ridge. The burden on the operator is reduced. Further, straight running performance is improved.

By making the rear wheel side of the mower heavier than the front wheel side, the front wheel serving as a guide for operating the steering wheel becomes lighter and maneuverability is improved.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. In addition, "front", "rear", "left", "right",
"Upper" and "Lower" follow the direction as seen by the mower operator.
Further, the drawings are to be viewed in the direction of reference numerals. FIG. 1 is a plan view of a mower according to the present invention. The mower 1 is provided with a front wheel 3 at a front portion of a pipe-shaped body frame 2 and a rear wheel 4 at a rear portion thereof, and the body frame 2 has a larger diameter. The rocking pipe 5 is fitted, the engine 7 is placed on the rocking pipe 5, the cutter housing 10 is hung, and the flat blade 21 and the beveled blade 22 are separated from each other in the front and rear and right and left inside the cutter housing 10. It is a configuration of a double-sided mower, which is arranged in a row.

The cutter housing 10 is a body frame 2
A first housing 11 as a fixed-side housing and a second housing 12 as a swing-side housing attached to the
The first housing 11 houses the flat blade 21, and the second housing 12 houses the beveled blade 22. Reference numeral 14 is a swing axis line passing through the hinge 13. That is, the mower 1 offsets the flat blade 21 and the beveled blade 22 to one side (left side in this embodiment) from the traveling direction axis A of the body frame 2 passing through the wheel width center of the rear wheel 4, and the offset dimension in the same direction. Center width B of front wheel 3 by L
Is also offset, and the engine 7 is offset to the other (the right side in this embodiment). The plane blade 21 is slightly offset from the running direction axis A.

In this case, the front wheel 3 is a guide wheel which is a guide for steering when the mowing machine 1 is traveling and is made of narrow tires, and the rear wheel 4 is a traveling wheel for the mowing machine 1 to travel by itself. It consists of wide tires. Specifically, the rear wheel 4 is the front wheel 3
The wheel width is set to be wider than that of the front wheel 3, for example, the ratio of the wheel width of the front wheel 3 (about 35 mm) to the wheel width of the rear wheel 4 (about 100 mm) is about 1: 3. The offset dimension L of the front wheel 3 is about 3
It is 5 to 40 mm. Therefore, the left side surface of the front wheel 3 and the left side surface of the rear wheel 4 substantially coincide with each other. Furthermore, the mower 1 has a rear wheel 4
The side is set heavier than the side of the front wheel 3, and for example, the weight distribution of the mower 1 is set such that the ratio of the weight received by the front wheel 3 and the weight received by the rear wheel 4 is about 1: 4.

The front wheel 3 is attached to a front wheel arm 23 extending from the front portion of the vehicle body frame 2. An auxiliary wheel arm 24 extends from the left front part of the second housing 12, and an auxiliary wheel 25 for defining the height of the second housing 12 is attached to the front part of the auxiliary wheel arm 24.

The output shaft 7a of the engine 7 faces downward,
The flat blade 21 and the beveled blade 22 are rotated via the belt transmission mechanism 30. The belt transmission mechanism 30 is composed of a first belt 31, a second belt 32 and pulleys stretched vertically in two stages. The first belt 31 drives the flat blade 21 and the second belt 32 drives the inclined blade 22. It is a thing. That is, the first belt 31 includes the first pulley 33 attached to the output shaft 7a of the engine 7 and the flat blade shaft 21a.
It is wound around a second pulley 34 for driving the.

Reference numeral 42 is a rocking lever locked to the first housing 11. A tensioner roll 43 is formed at one end of the rocking lever 42, and a brake shoe 44 is formed at the other end.
The operator uses an operation lever and a wire (not shown) to swing the swing lever 4
When 2 is swung counterclockwise in the figure, the first belt 31 is tensioned, the power of the first pulley 33 is transmitted to the second pulley 34, and the plane blade shaft 21a is driven. On the contrary, when the swing lever 42 is swung clockwise, the first belt 31 is slackened and the power transmission is weakened, so that the brake shoe 42 can brake the first belt 31. According to the above procedure, the flat blade 21 can be arbitrarily operated / stopped while the engine is operating and running.

The second belt 32 includes an idler pulley 35 (hereinafter referred to as "third pulley 35") integrally formed below the second pulley 34, a fourth pulley 36 for driving the beveled blade shaft 22a, and a wobble. Three idler pulleys 37 to 39 (hereinafter, referred to as “fifth, sixth, and seventh pulleys 37 to 39”) arranged substantially in one row in the front and rear in the vicinity of the moving axis 14;
The idler pulley 4 integrally formed below the pulley 37
1 (hereinafter referred to as "eighth pulley 41"). In terms of arrangement, the rear fifth pulley 37 (eighth pulley 4
(Including 1) is pivotally supported on the first housing 11, and the inclined sixth pulley 38 on the front side and the seventh pulley 39 at the center are pivotally supported on the second housing 12. Therefore, the second belt 32
Is the third pulley 35, the fifth pulley 37, the sixth pulley 38,
It is wound by a loop of the fourth pulley 36, the seventh pulley 39, the eighth pulley 41, and the third pulley 35.

FIG. 2 is a side view (main part) of the mower according to the present invention, in which the rocking tube 5 is attached to the body frame 2.
An engine 7 is mounted on the rocking tube 5 via a mount plate 6.
Is mounted, while the first housing 11 is suspended from the swing tube 5 via the hanger brackets 8 and 8. The engine 7 uses the above-mentioned two cutting blades (flat blade 2
1 and the beveled blade 22), a continuously variable transmission 27 is driven via a universal shaft 26, and the rear wheels 4 are driven by the continuously variable transmission 27 via a chain 28.

The front wheel arm 23 is attached to the body frame 2 side by a pin 51, and the attachment angle can be changed by replacing the insertion pin 52. 53 ... (... indicates a plurality, the same applies hereinafter) is a pin hole, and 54 is a plate. Similarly, the auxiliary wheel arm 24 is attached to the second housing 12 side by a pin 55, and the attachment angle can be changed by replacing the insertion pin 56. 57 is a plate. Further, the handle 61 is swingably attached to the rear portion of the vehicle body frame 2 with a pin 62, and the insertion pin 6
It is a mechanism that can change the mounting angle by replacing 3. 64 ... Pin holes, and 65 are supports.

Although the oscillating tube 5 may be omitted and the first housing 11 may be directly attached to the vehicle body frame 2 via a bracket, in the present embodiment, the first housing 11 can be oscillated to some extent. . Also, the cutter housing 10
Is not limited to the hanging structure, and may be mounted, for example.

FIG. 3 is a view (front view) showing a swinging posture of the mower according to the present invention. The hinge 1 is attached to the first housing 11.
It is shown that the second housing 12 is swingably connected via 3. Reference numeral 67 is a pipe-shaped front wheel guard member that straddles the front wheel 3.

The operation of the above-mentioned mower is shown in FIGS.
It will be explained based on. The mowing machine 1 in the posture shown in FIG. 2 has a non-oscillating posture in which the beveled blade 22 is parallel (flush) with the plane blade 21, and is suitable for traveling on farm roads and mowing on a wide flat surface. At this time, the auxiliary wheel 25 can be floated from the ground by lifting the second housing 12 using a chain or the like (not shown).

In the mower 1 having the posture shown in FIG. 3, the plane blade 21 is parallel to the upper surface 71 of the ridge 70, and the second housing 12 and the bevel blade 22 are inclined along the inclined surface 72. Then, the grass on the upper surface 71 of the ridge 70 is cut by the plane blade 21, and the grass on the slope 72 is cut by the slope blade 22.

By the way, as described above, in order to eliminate uncut grass on the slope 72, the interval between the slope 72 of the ridge 70 and the slope blade 22 may be made constant. For that purpose, it is necessary to drive the mower 1 along the corner 73 of the ridge 70,
The operator operates so that the interval between the front wheel 3 and the corner 73 of the ridge 70, which is a guideline for the operation, becomes constant, but it is easier to make the interval constant by bringing the front wheel 3 as close as possible to the corner 73 as shown in this figure. . In this case, even if the front wheel 3 approaches the corner 73 of the ridge 70, the rear wheel 4 as a traveling wheel passes through a position away from the corner 73. Therefore, only the front wheel 3 as the guide wheel needs to be operated so as not to be removed from the upper surface 71 of the ridge 70, and the burden on the operator is reduced.

Further, the ratio of the weight received by the front wheels 3 and the weight received by the rear wheels 4 is about 1: 4. Since the weight received by the front wheels 3 is significantly light, the maneuverability is enhanced and the front wheels 3 are cornered on the ridge 70. It is easy to run along 73. Further, the beveled blade 22 is largely offset from the running direction axis A of the vehicle body frame 2 toward the beveled surface 72 of the ridge 70 and is in a tilted posture, so that the left and right weight balance of the mower 1 tends to be biased. Since 3 is also offset in the same direction, the weight balance is not biased and the straight running performance is improved.

In the above embodiment, the mower 1 has two
The present invention is not limited to the configuration of the double-sided mower that has two cutting blades (the flat blade 21 and the beveled blade 22), and can be applied to, for example, the configuration of a single-sided mower that has a single blade. Also,
At least one cutting blade passes through the rear wheel 4 and the body frame 2
The configuration may be offset from the traveling direction axis A of FIG.

[0025]

The present invention has the following effects due to the above configuration. According to another aspect of the present invention, in the mower of claim 1, the front wheel of the mower having a cutting blade offset from the traveling axis of the body frame passing through the rear wheel in one direction is offset in the same direction as the cutting blade. When traveling along the corner of the ridge, only the front wheel that guides the steering wheel operation can be brought close to the ridge corner, so there is no risk of the front and rear wheels coming off the top of the ridge, reducing the burden on the operator. it can. In addition, straight running performance is improved without providing a special member for balancing the right and left weights of the mower.

In the mower according to the second aspect of the present invention, since the rear wheel side of the mower is heavier than the front wheel side, the front wheel serving as a guide for operating the handle becomes lighter and the maneuverability is good.

[Brief description of drawings]

FIG. 1 is a plan view of a mower according to the present invention.

FIG. 2 is a side view (main part) of the mower according to the present invention.

FIG. 3 is a view showing a swinging posture of the mower according to the present invention (front view).

[Explanation of symbols]

1 ... Mower, 2 ... Body frame, 3 ... Front wheel, 4 ... Rear wheel,
7 ... Engine, 10 ... Cutter housing, 11 ... First housing, 12 ... Second housing, 13 ... Hinge, 21
... Cutting blade (flat blade), 22 ... Cutting blade (slope blade), 25 ... Auxiliary wheel, 70 ... Ridge, 71 ... Top surface, 72 ... Slope, 73 ... Corner, A
… Axis of running direction of body frame, B…, wheel width center of front wheel, L… offset dimension.

Claims (2)

[Claims] 1. A body frame is provided with two wheels, a front wheel and a rear wheel, and a cutting blade between the front and rear wheels, and the cutting blade is offset to one side from a traveling direction axis of the body frame passing through the rear wheel. A mower, wherein the front wheel is offset in the same direction as the cutting blade. 2. The mower according to claim 1, wherein the rear wheel side of the mower is heavier than the front wheel side.