JPH08172851A - Mower - Google Patents

Abstract

PURPOSE: To improve the straight advance properties by preventing the mower from advancing to the side of a slope of a ridge due to an overhang load of the second housing. CONSTITUTION: This mower 1 is obtained by tilting and installing a front wheel in the direction to separate the upper part from the second housing relatively to the vertical shaft of the car body when the wheel width center line CL of the rear wheel is the vertical shaft of the car body in the mower, equipped with a cutter housing attached to a car body frame 2 having two wheels of a front wheel 3 and a rear wheel and the cutter housing constituted of the first housing 14 mutually connected to the second housing 15 with hinges and further formed of the type for cutting grass on the top surface of the ridge with the planar blade 10 in the first housing and cutting grass on the slope of the ridge with the slope blade 11 in the second housing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved two-sided mower.

[0002]

2. Description of the Related Art As a measure to reduce labor for rice cultivation, attempts have been made to replace mowing on ridges with human power, for example, Japanese Patent Laid-Open No. 6-276825, "Mowing Machine and Angle Adjusting Device and Swing Control Device". There is Japanese Utility Model Laid-Open No. 5-9228, “Mower”, which was previously proposed by the present applicant. According to FIGS. 1 and 3 of the publication, the cutter base 2 is attached to the frame F.
Is a mower in which the variable cutter base 3 is hingedly connected to the cutter base 2, and the rotary blade 43 for cutting the upper surface of the ridge is housed in the cutter base 2, and the slope of the ridge is attached to the variable cutter base 3. The rotary blade 43a for cutting the wood is stored.

According to FIG. 2 of the publication, is a mower in which a fixed side housing 21 is attached to a support frame 7, and a swing housing 25 is hingedly connected to the fixed side housing 21, and the fixed side housing 21 has a ridge. The main rotary blade 31 for cutting the upper surface is housed, and the sub rotary blade 35 for cutting the slope of the ridge is housed in the swing housing 25.

[0004]

The rotary blade is required to always follow the upper surface or the slope of the ridge (not to rise from the upper surface or the slope of the ridge) in order to surely mow the grass of the ridge. The above is an overhang of the variable cutter base 3 from the cutter base 2 as shown in FIG. 5 of the publication.
The same applies to the above. That is, since the center of gravity of the conventional two-sided mower is biased toward the slope of the ridge, the rotary blade does not float from the slope of the ridge, but it has the property of trying to bend to the slope of the ridge, and therefore runs straight. It is necessary for the worker to tilt the mower toward the side opposite to the slope and to drive, so the burden on the worker is not small. An object of the present invention is to provide a mowing machine that can surely mow ridge grass and to improve the straight running performance of the mowing machine.

[0005]

To achieve the above object, the present invention provides a first housing in which a cutter housing is attached to a vehicle body frame having two wheels, a front wheel and a rear wheel, and the cutter housings are hinged to each other. In a mower of the type configured with a second cutter housing, in which a flat blade in the first housing cuts the upper surface of the ridge and a slope blade in the second housing cuts the slope of the ridge, When the vertical axis is used, the front wheel is attached so as to be inclined with respect to the vertical axis of the vehicle body in a direction in which the upper portion is separated from the second housing.

Further, the inclination angle of the front wheel is set in the range of 5 ° to 10 °.

[0007]

The front wheel prevents the mower from moving toward the slope side of the ridge due to the overhang load of the second housing. Therefore, the mowing machine can easily travel straight.

If the inclination angle of the front wheels is smaller than 5 °, the influence of the overhang load of the second housing remains, and if it is larger than 10 °, the influence of the inclination of the front wheels is too large and the mower tries to move to the opposite side of the slope of the ridge. And The lawn mower has the best straight running performance when the front wheel tilt angle is in the range of 5 ° to 10 °.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals. FIG. 1 is a plan view of a mower according to the present invention.
The pipe-shaped body frame 2 is provided with front wheels 3 at the front and rear wheels 4 at the rear, and the body frame 2 has a swing tube 5 with a larger diameter.
, The engine 6 is placed on the rocking tube 5, and the cutter housing 7 is suspended.
A plane blade 10 and a beveled blade 11 are arranged inside the front and rear sides and left and right sides (both of which are seen by an operator) at a distance. The cutter housing 7 is formed by connecting hinges 12 and 12 to a first housing 14 as a fixed side housing and a second housing 15 as a swing side housing. Reference numeral 13 is a swing axis line passing through the hinges 12, 12. 16 is an auxiliary wheel that defines the height of the second housing 15.

The output shaft 6a of the engine 6 faces downward,
The rear wheel 4 is driven via a transmission means (not shown) (for example, a universal shaft, a sprocket, a chain, etc.), and the plane blade 10 and the sloped blade 11 are rotated via a pulley and a belt. Will be described later. CL indicates the center line of the wheel width W of the rear wheel 4 (wheel width center line). Although the oscillating tube 5 may be omitted and the first housing 14 may be directly attached to the vehicle body frame 2 via a bracket, the first housing 14 can be oscillated to some extent in this embodiment. Further, the cutter housing 7 may be configured to be attached to the vehicle body frame 2, and is not limited to the hanging configuration,
For example, it may be placed.

FIG. 2 is a side view (main part) of the mower according to the present invention. The front wheel 3 is rotatably attached to the front frame 8, and the front frame 8 is attached to the vehicle body frame 2 side by the pin 17. And insert pin 18
It is a mechanism that can change the mounting angle by replacing the. 19 (... indicates a plurality, the same applies hereinafter) is a pin hole, and 21 is a plate. Similarly, the handle 22 is swingably attached to the rear portion of the vehicle body frame 2,
The mechanism is such that the mounting angle can be changed by replacing the insertion pin 23. 24 ... Pin holes, 2
Reference numerals 5 and 26 are plates.

FIG. 3 is a front view (main part) of the mower according to the present invention, showing a wheel width center line CL of the rear wheel 4 (not shown) (FIG. 1).
(Refer to FIG. 3) as the longitudinal axis of the vehicle body (vertical axis of the vehicle body), the front wheel 3 has the second housing 1 at the upper portion with respect to the longitudinal axis of the vehicle body.
It is attached so as to be inclined in a direction away from 5. As a result of the experiment, if the inclination angle θ of the front wheel 3 is smaller than 5 °, the influence of the overhang load of the second housing 15 remains, and if it is larger than 10 °, the influence of the inclination of the front wheel 3 is too large and the grass mower 1 causes the slope of the ridge. It turned out to try to go to the other side. Therefore, the inclination angle θ of the front wheel 3 is set within a practical range of 5 ° to 10 °.

FIG. 4 is a front sectional view of a mower according to the present invention, in which a rocking tube 5 is attached to a vehicle body frame 2, and an engine 6 is mounted on the rocking tube 5 via a mount plate 27. , The hanger bracket 28 on the swing tube 5,
It is shown that the first housing 14 is suspended via 29, and the second housing 15 is connected to this first housing 14 via hinges 12, 12.

Further, in the present embodiment, the first belt 31 and the second belt 32, which are the main elements of the belt transmission mechanism 30, are stretched in two steps, and the first belt 31 drives the flat blade 10,
The bevel blade 11 is driven by the second belt 32. The belt transmission mechanism 30 is a mechanism for transmitting the output of the engine 6 to the flat blade 10 and the beveled blade 11, and includes belts 31 and 32 and pulleys described below. In the figure, reference numerals 33 and 34 denote bearing portions having a shaft and a bearing built therein.

FIGS. 5 (a) and 5 (b) are belt transmission mechanism diagrams of the mower according to the present invention. FIG. 5 (a) is an upper stage first belt 31 and related pulleys, and FIG. 5 (b) is a lower stage second. Belt 32
And related pulleys are shown. In FIG. 1, the belts 31 and 32 are indistinct because they overlap with each other and are therefore indistinct.
(A) shows a first pulley 35 attached to the output shaft 6a of the engine, a second pulley 36 for driving the flat blade shaft 10a, and the first and second pulleys 35, 36 that form a triangular vertex. Pulleys 35, 3 consisting of 3 pulleys 37
6 and 37 show that the first belt 31 is wound. The support shaft 38 of the third pulley 37 is provided upright on the first housing 14.

Further, 39 is a rocking lever locked to the first housing 14 by a pin 39a.
If a tensioner roll 39b is formed at one end of 9 and a brake shoe 39c is formed at the other end, and an operator swings the swing lever 39 in the counterclockwise direction with an operation lever and a wire (not shown), the first belt 31 is tensioned. Then, the power of the first pulley 35 is transmitted to the second pulley 36 to drive the flat blade shaft 10a. On the contrary, when the rocking lever 39 is rocked clockwise, the first belt 31 is slackened and the power transmission is weakened, so that the brake shoe 39c can brake the first belt 31. According to the above procedure, the flat blade 10 can be arbitrarily operated / stopped while the engine is operating and running.

(B) is an idler pulley 41 (hereinafter referred to as "fourth pulley 4") integrally formed below the third pulley 37.
1 "), the sixth pulley 43 for driving the beveled blade shaft 11a, and the idler pulley 42 (hereinafter referred to as the" fifth pulley 42 ") in which the fourth and sixth pulleys 41, 43 both form a triangular vertex. Pulleys 41, 42, 43 consisting of
Indicates that the second belt 32 is wound. In addition,
The support shaft 44 of the fifth pulley 42 is provided upright on the second housing 15. A tensioner roll 46 constantly tensions the second belt 32 with a lever 46c that swings around a spring 46a and a pin 46b.

That is, two idler pulleys 41 and 42 are arranged apart from each other on the swing axis 13, and one idler pulley 41 is axially supported by the first housing 14 and the other idler pulley 41 is axially supported. The idler pulley 42 is pivotally supported on the second housing 15.

The operation of the above-mentioned mower will be described below. FIG. 6 is a rear cross-sectional view of the mower according to the present invention, showing a non-oscillating posture in which the beveled blade 11 is parallel (flush) with the flat blade 10. This non-oscillating posture is suitable for traveling on farm roads and for mowing large flat surfaces. At this time, by using the chain 47 and the pulley 48 shown in phantom lines, the second housing 1
By raising 5, the auxiliary wheel 16 shown in FIG. 1 can be floated from the ground.

7 (a) and 7 (b) are diagrams for explaining the operation of the first and second belts of the first embodiment according to the present invention. FIG. 7 (a) is a non-oscillating posture, that is, the second belt 32. Is parallel to (including substantially parallel to) the first belt 31. (B) shows a swinging posture where the second housing 15 is swung largely downward for the purpose of cutting grass on the slope, and between the fourth pulley 41 and the fifth pulley 42 (range) and the fourth pulley 41. The second belt 32 is twisted between the tensioner roller 46 and the tensioner roller 46 (range). Since the second belt 32 is highly flexible, the twist angle is allowed up to 90 °. Therefore, if the angle is about 45 ° as shown, there is no problem in transmission and belt life.

FIG. 8 is a view showing the swinging posture of the mower according to the present invention. The plane blade 10 is parallel to the upper surface 51 of the ridge 50, and the second housing 15 and the bevel blade 11 follow the slope 52. Indicates that it is inclined. With this posture, 50 ridges
The grass on the upper surface 51 is mowed by the flat blade 10, and the grass on the slope 52 is cut by the slope blade 11.

9 (a) and 9 (b) are diagrams showing a state in which the mower according to the present invention is traveling in a swinging posture, in which (a) is a front view and (b) is a plan view. As shown in (a), the center of gravity of the mower 1 is biased toward the slope 52 due to the overhang load of the second housing 15. Therefore, the front wheels 3
Tries to travel on the locus of the traveling line L curved to the left in the traveling direction (on the side of the slope 52) shown in (b). When the front wheels 3 are not tilted, it is necessary for an operator to run the grass mower 1 while tilting it toward the side opposite to the slope 52. Generally, when the upper part of the wheels (including the front wheels 3) is tilted on the side opposite to the slope 52 as shown in (a), the vehicle tries to travel along the trajectory of the traveling line R curved to the right in the traveling direction shown in (b). To do. Therefore,
As shown in (a), when the wheel width center line CL is the longitudinal axis of the vehicle body and the front wheel 3 is mounted so as to be inclined with respect to the longitudinal axis of the vehicle body in the direction in which the upper part thereof separates from the second housing 15, the front wheel 3 becomes (b). A straight traveling line S almost in the middle between the traveling line L and the traveling line R shown.
Run on the trajectory of. For this reason, the mowing machine 1 travels almost straight on the upper surface 51 of the ridge 50, so that the straight running performance is good.

Incidentally, in FIG. 7B, in order to arrange the support shafts 38 and 44 supporting the idler pulley on the swing axis line 13 passing through the hinges 12 and 12, the housings 14 and 15 are arranged.
A bulge portion 14a and a cutout portion 15a are formed on the bottom. However, by mounting the support shaft 38 twice the shaft outer diameter from the swing axis 13 toward the first housing 14, the bulging portion 1
The support shaft 38 is attached to the first housing 14 without providing the 4a.
It can be mounted on top. The support shaft 44 is also the second
Mount on the housing 15.

[0024]

The present invention has the following effects due to the above configuration. A mower according to claim 1 has a cutter housing attached to a vehicle body frame having two wheels, a front wheel and a rear wheel, and a first housing and a second housing in which the cutter housings are hinged to each other.
The second housing is formed by a cutter housing, and when the wheel width center line of the rear wheel is the longitudinal axis of the vehicle body, the front wheel is attached so as to be inclined with respect to the longitudinal axis of the vehicle body in a direction in which the upper portion is separated from the second housing. It is possible to prevent the mowing machine from trying to move to the slope side of the ridge due to the overhang load, and to improve the straight running performance.

In the mower of claim 2, the front wheel has an inclination angle of 5 °.
Since it is set in the range of -10 °, the influence of the overhang load of the second housing is eliminated, and the influence of the front wheel inclination is too great, and the mower does not try to move to the slope on the opposite side of the ridge. , Straight running performance is improved and it is easy to control.

[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 front view (main part) of the mower according to the present invention.

FIG. 4 is a front sectional view of a mower according to the present invention.

FIG. 5 is a belt transmission mechanism diagram of the mower according to the present invention.

FIG. 6 is a rear cross-sectional view of the mower according to the present invention.

FIG. 7 is an operation explanatory view of the first and second belts according to the present invention.

FIG. 8 is a diagram showing a swinging posture of the mower according to the present invention.

FIG. 9 is a diagram showing a state in which the mower according to the present invention travels in a swinging posture.

[Explanation of symbols]

1 ... Mower, 2 ... Body frame, 3 ... Front wheel, 4 ... Rear wheel,
5 ... rocking tube, 6 ... engine, 7 ... cutter housing, 1
0 ... Plane blade, 11 ... Slope blade, 13 ... Oscillation axis line, 14 ... First housing, 15 ... Second housing, 16 ... Auxiliary wheel,
30 ... Belt transmission mechanism, 50 ... Ridge, 51 ... Top surface, 52 ...
Slope, CL ... Wheel width center line, W ... Wheel width of rear wheel, θ ... Inclination angle.

Claims (2)

[Claims] 1. A flat blade in the first housing, wherein a cutter housing is attached to a vehicle body frame having two wheels, a front wheel and a rear wheel, and the cutter housing is composed of a first housing and a second cutter housing hinged to each other. In a mower of the type in which the upper surface of the ridge is mowed and the slope of the ridge is mowed by the bevel blade in the second housing, when the wheel width center line of the rear wheel is the vehicle body vertical axis, the front wheel is The upper part of the upper part is inclined and attached in a direction away from the second housing. 2. The mower according to claim 1, wherein the inclination angle of the front wheel is set in a range of 5 ° to 10 °.