JP3390774B2 - Mower - Google Patents

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 for reducing labor in rice cultivation, attempts have been made to replace mowing ridges with human power instead of manpower.
No. 276825 "Mower and angle adjusting device and rocking control device" and Japanese Utility Model Laid-Open No. 5-92 previously proposed by the applicant.
There is a publication No. 28, "Mower". The above is the second part of that publication
According to the figure, a mower having rotary blades c and d driven by an engine E, and according to FIG. 3 of the publication, the rotary blade c for cutting the upper surface of the ridge and the rotary blade d for cutting the slope are shown. It is connected by a flexible tube 7. According to FIG. 4 of the publication, one of the rotary cutters 4 is driven by the prime mover E (not shown), the belt 59 and the gear box 41, and the gear box 41, the drive shaft 5 and the gear box 41a. The other rotary cutter 4a is driven. The drive shaft 5 is a universal joint having a three-stage spline structure, and its angle can be freely changed.

According to FIG. 2 of the publication, the above is a mower equipped with a main rotary blade 31 for cutting the upper surface of a ridge and a sub rotary blade 35 for cutting an inclined surface.
1 is driven, and the auxiliary rotary blade 35 is driven by the pulley of the main rotary blade 31 via another belt.

[0004]

In the above, the two rotary blades c and d are connected by the flexible tube 7, but the flexible tube 7 has a large allowable bending radius. Therefore, the flexible tube 7 is greatly bulged upward, which becomes an obstacle and the safety cover becomes extremely large if the safety cover is applied.

The above-mentioned universal joint having a three-stage spline structure is extremely expensive, and since the structure is complicated, problems such as spline chipping and built-in pin cracking tend to occur when an excessive load acts. The rotary cutter may hit hard trees and stones as well as grass, and the drive shaft cannot handle trees and stones.Therefore, it is necessary to install a safety mechanism in the transmission mechanism. It becomes complicated.

Since the above can slip between the belt and the pulley, the above overload can be coped well. However, as shown in FIG. 5 of that publication, the swing angle cannot be increased. If the swing angle is increased, the belt may interfere with the housing. Further, in the above, when the swing angle is large, the amount of vertical displacement of the belt is large, and therefore an excessive frictional force may act between the belt and the pulley. For this reason,
In order to extend the life of the belt when the swing angle is large, it is necessary to use a highly durable belt, which increases the cost. Further, it is necessary to provide a mechanism for preventing the belt from coming off due to a large amount of vertical displacement of the belt, which increases the cost.

It is an object of the present invention to employ an inexpensive belt transmission mechanism without using a flexible tube or an expensive universal joint, which causes an increase in size of the apparatus. Therefore, the belt transmission mechanism needs to have a structure that allows a large swing angle, and the structure has been successfully found.

[0008]

In order to achieve the above object, the present invention is directed to a first housing containing a flat blade for cutting the upper surface of a ridge, and a sloped surface of the ridge swingably hinged to the first housing. A first housing housing a second housing accommodating a beveled blade for cutting a blade, an engine for driving the plane blade and the beveled blade, and a belt transmission mechanism for transmitting the output of the engine to the plane blade and the beveled blade. In a mower in which a fixed idler pulley is pivotally supported by, a swing side idler pulley is pivotally supported by the second housing, and a belt is twisted between the fixed idler pulley and the swing idler pulley, The swing side idler pulley is arranged at a position where the highest point of the pitch circle at the time of maximum swing is substantially aligned with the reference plane passing through the pitch circle of the fixed side idler pulley. Characterized in that it was.

Specifically, the second housing is axially supported.
The rocking side idler pulley, arranged in range that it of the pitch circle in plan view without departing from the pivot axis passing through the hinge.

The fixed idler pulley pivotally supported by the first housing is arranged near the second housing within a range in which the pitch circle of the fixed idler pulley does not deviate from the swing axis passing through the hinge in plan view. Is desirable.

Further, it is desirable that the center of the swing side idler pulley is located on a swing axis which passes through a hinge.

[0012]

[Operation] "Twist" the belt between the fixed idler pulley and the swing idler pulley. This mechanism increases the swing angle. Furthermore, when the idler pulley on the swing side swings, the amount of vertical displacement of the belt between the reference plane that passes through the pitch circle of the fixed idler pulley and the highest point of the pitch circle of the idler pulley on the swing side Few. For this reason,
Since an excessive frictional force does not act between the belt and the pulley, the life of the belt is extended and the belt is prevented from coming off from the fixed side / swing side idler pulley.

[0013] The swinging side idler pulley is pivotally supported to the second housing, because it of the pitch circle in plan view and arranged in range without departing from the pivot axis through the hinges, easy layout of a belt transmission mechanism Decided.

Since the fixed idler pulley pivotally supported by the first housing is arranged near the second housing within a range in which the pitch circle of the fixed idler pulley does not deviate from the swing axis line passing through the hinge in plan view, the fixed idler pulley is provided. The degree of freedom in arranging the pulleys increases.

When the center of the swing-side idler pulley is arranged on the swing axis line passing through the hinge, the position of the swing-side idler pulley is fixed and the design becomes easy.

[0016]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of the reference numerals. First, a first embodiment will be described with reference to FIGS. FIG. 1 is a plan view of a mower (first embodiment) according to the present invention. The mower 1 includes a pipe-shaped body frame 2, a front wheel 3, and a front wheel 3.
A rear wheel 4 is provided at the rear part, and a swing pipe 5 having a larger diameter is fitted to the vehicle body frame 2, an engine 6 is mounted on the swing pipe 5, and a cutter housing 7 is suspended to cut the cutter housing 7. 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. 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.

FIG. 2 shows a mower according to the present invention (first embodiment).
Is a side view (main part) of the front wheel 3 is attached to the vehicle body frame 2 side by a pin 17, and the insertion 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 shows a mower according to the present invention (first embodiment).
3 is a front cross-sectional view of the rocking pipe 5 mounted on the vehicle body frame 2, the engine 6 is mounted on the rocking pipe 5 via a mount plate 27, and the hanger brackets 28, 29 are mounted on the rocking pipe 5. The first housing 14 is suspended through the hinges 12, 12,
It shows that the second housing 15 is connected via.

Further, in this 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 blade 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. 4A and 4B are belt transmission mechanism diagrams of the mower according to the present invention (first embodiment). FIG. 4A is the upper first belt 31 and related pulleys, and FIG. ) Indicates the lower second belt 32 and related pulleys. 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. It is shown that the first belt 31 is wound around the pulleys 35, 36, and 37 including the three pulleys 37. 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 a fixed idler pulley 41 (hereinafter referred to as "fourth pulley 41") integrally formed below the third pulley 37, a sixth pulley 43 for driving the beveled blade shaft 11a, A swing-side idler pulley 42 in which both the fourth and sixth pulleys 41 and 43 form a triangular vertex.
(Hereinafter referred to as "fifth pulley 42")
It shows that the second belt 32 is wound around 1, 42 and 43. Then, the fourth and fifth pulleys 41, 42 are arranged apart from each other. Each pulley 35-37, 41-43
Is a V pulley for hanging the first and second belts 31 and 32, which are V belts. The support shaft 44 of the fifth pulley 42 is provided upright on the second housing 15. 46
Is a tensioner roll, and the second belt 32 is always tensioned by a lever 46c that swings around a spring 46a and a pin 46b.

FIGS. 5 (a) and 5 (b) are structural views showing the arrangement of the idler pulleys of the mower (first embodiment) according to the present invention. FIG. 5 (a) shows the second housing 15 not swinging. Shows the state of arrangement of the idler pulley when in the posture, (b)
Shows the arrangement of the idler pulley when the second housing 15 is in the swinging posture. In the figure, a surface passing through the pitch circle of the fourth pulley (fixed idler pulley) 41 is defined as a reference surface M, and a fifth pulley (swing side idler pulley) 42
The diameter of the pitch circle (P.C.D.) is defined as D, and the height difference between the pitch circle and the swing axis 13 is defined as the height H (hereinafter, referred to as "pulley mounting height H").

(B) shows the fourth pulley 41 and the fifth pulley 4
2 shows the arrangement relationship with 2. In the fifth pulley 42, when the maximum swing of the second housing 15 and the fifth pulley 42 (maximum swing angle θ), the highest point Q of the pitch circle of the fifth pulley 42 is
The fourth pulley 41 is arranged at a position substantially coincident with the reference plane M passing through the pitch circle of the fourth pulley 41. Specifically, the second house
Fifth pulley 42 which is pivotally supported on the grayed 15 is arranged in the range where it of the pitch circle in plan view without departing from the pivot axis 13. L is a separation distance (from the swing axis 13 to the fifth pulley 42)
Distance).

The operation of the above-mentioned mower will be described below. FIG. 6 is a rear cross-sectional view of the mower (first embodiment) according to the present invention, showing a non-oscillating posture in which the beveled blade 11 is parallel (flush) with the plane blade 10. This non-oscillating posture is suitable for traveling on farm roads and for mowing large flat surfaces. At this time, the auxiliary wheel 16 shown in FIG. 1 can be floated from the ground by lifting the second housing 15 by using the chain 47 and the pulley 48 shown by imaginary lines.

FIGS. 7 (a) and 7 (b) are operation explanatory views 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 in which the second housing 15 is swung largely downward for the purpose of cutting a slope, between the fourth pulley 41 and the fifth pulley 42 (range) and between the fourth pulley 41 and the tensioner. Laura 4
The second belt 32 is twisted between 6 and 6 (range). Since the second belt 32 is highly flexible, the twist angle is 9
Allowed up to 0 °. Therefore, if the angle is about 45 ° as shown, there is no problem in transmission and belt life.

FIG. 8 shows a mower according to the present invention (first embodiment).
It is a figure which shows the rocking | fluctuation attitude | position of the plane blade 10 in parallel with the upper surface 51 of the ridge 50, and imitates the slope 52, and the 2nd housing
5 and the beveled blade 11 are inclined. In this posture, the grass on the upper surface 51 of the ridge 50 is cut by the plane blade 10, and the grass on the slope 52 is cut by the slope blade 11.

FIG. 9 is a diagram for explaining the operation of the swing side idler pulley (first embodiment) according to the present invention. The locus of the highest point Q of the pitch circle of the fifth pulley (swing side idler pulley) 42 is shown in FIG. , As indicated by R. That is, the highest point Q during non-oscillation coincides with X1, and the highest point Q during maximum oscillation coincides with X2. Therefore, the highest point Q does not largely offset from the reference plane M passing through the pitch circle even during the swing or at any swing angle, so that the second belt 32 is not excessively twisted.

Next, a second embodiment will be described with reference to FIG. FIG. 10 is a belt transmission mechanism diagram of a mower (second embodiment) according to the present invention, in which a fourth pulley (fixed idler pulley) 41 has a swing axis whose pitch circle passes through the hinge 12 in plan view. It is characterized in that it is arranged closer to the second housing 15 side within a range that does not deviate from 13, and since the other configurations are the same as those of the above-mentioned first embodiment, the same parts are denoted by the same reference numerals in FIG. 4 (b). Is omitted. Even when the fourth and fifth pulleys 41 and 42 are arranged as in the second embodiment, the running of the second belt 32 was good. According to the experiments by the inventors, the fourth idler pulley 41 is arranged closer to the second housing 15 within a range in which the pitch circle of the fourth idler pulley 41 does not deviate from the swing axis line 13 passing through the hinge 12. Then, I was able to confirm the smooth belt running.

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.

The center of the fifth pulley (swing side idler pulley) 42 may be arranged on the swing axis line 13.

[0033]

The present invention has the following effects due to the above configuration. In the mower according to claim 1, the swing-side idler pulley is arranged at a position where the highest point of the pitch circle at the time of maximum swing substantially matches the reference plane passing through the pitch circle of the fixed-side idler pulley. As a result, the belt is skillfully twisted between the fixed-side and swing-side idler pulleys, and the meshing between these idler pulleys and the belt is improved, so that proper transmission can be achieved. Furthermore, when the idler pulley on the swing side swings, the amount of vertical displacement of the belt between the reference plane that passes through the pitch circle of the fixed idler pulley and the highest point of the pitch circle of the idler pulley on the swing side Since it is small, an excessive frictional force does not act between the belt and the pulley. Therefore, it is possible to extend the life of the belt without using a highly durable belt and prevent the belt from coming off from the fixed side / swing side idler pulley. Therefore, the structure of the belt transmission mechanism is simplified, and the manufacturing cost of the mower can be reduced.

A mower according to claim 2 is characterized in that the second housing has a shaft.
The swinging side idler pulley is supported, because it of the pitch circle in plan view and arranged in range without departing from the pivot axis through the hinges, determined to facilitate the layout of the belt transmission mechanism, easy to design and manufacture Become.

According to a third aspect of the present invention, the first housing has a shaft.
The fixed-side idler pulley is supported, to the extent that it of the pitch circle in plan view does not deviate from the pivot axis through a hinge, so disposed on the second housing side closer, the degree of freedom in arrangement of the fixed-side idler pulley is increased .

In the mower according to claim 4, the center of the swing side idler pulley is substantially on the swing axis line passing through the hinge, so that the position of the swing side idler pulley is determined and the design becomes easy.

[Brief description of drawings]

FIG. 1 is a plan view of a mower (first embodiment) according to the present invention.

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

FIG. 3 is a front sectional view of a mower (first embodiment) according to the present invention.

FIG. 4 is a belt transmission mechanism diagram of a mower (first embodiment) according to the present invention.

FIG. 5 is a configuration diagram showing an arrangement state of idler pulleys of the mower according to the present invention (first embodiment).

FIG. 6 is a rear sectional view of a mower (first embodiment) according to the present invention.

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

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

FIG. 9 is an operation explanatory view of the swing side idler pulley (first embodiment) according to the present invention.

FIG. 10 is a belt transmission mechanism diagram of a mower (second embodiment) according to the present invention.

[Explanation of symbols]

1 ... Mower, 2 ... Body frame, 3 ... Front wheel, 4 ... Rear wheel,
6 ... Engine, 7 ... Cutter housing, 10 ... Flat blade,
11 ... Beveled blade, 12 ... Hinge, 13 ... Swing axis, 14 ...
First housing, 15 ... Second housing, 30 ... Belt transmission mechanism, 31 ... First belt, 32 ... Second belt, 35
... first pulley, 36 ... second pulley, 37 ... third pulley,
38, 44 ... Spindle, 41 ... Fixed side idler pulley (4th pulley), 42 ... Swing side idler pulley (5th pulley), 43 ... 6th pulley, D ... Pitch circle diameter, H ... Pulley mounting height , L ... separation distance (distance from swing axis),
M ... Reference plane passing through the pitch circle, Q ... The highest point of the pitch circle at the maximum swing.

Continuation of the front page (56) References SAIKAI Hei 5-9228 (JP, U) SHIKKO 47-33235 (JP, Y1) (58) Fields investigated (Int.Cl. ⁷ , DB name) A01D 34 / 86

Claims (4)

(57) [Claims] 1. A first housing for accommodating a flat blade for cutting the upper surface of a ridge, a second housing for accommodating a slanting blade for swinging a slope of the ridge and swingably hinged to the first housing, and the flat blade. And an engine for driving the beveled blade, and a belt transmission mechanism for transmitting the output of the engine to the flat blade and the beveled blade, the fixed-side idler pulley is axially supported on the first housing, and the second housing is provided on the second housing. In a mower in which the swing-side idler pulley is pivotally supported, and the belt is twisted between the fixed-side idler pulley and the swing-side idler pulley, the swing-side idler pulley has a pitch at the maximum swing. The mower is characterized in that the highest point of the circle is arranged at a position substantially coincident with a reference plane passing through the pitch circle of the fixed side idler pulley. Wherein said swing side idler pulley is axially supported on the second housing, a feature that is located in the range where it of the pitch circle in plan view without departing from the pivot axis passing through the hinge The mower according to claim 1. 3. The fixed idler pulley pivotally supported by the first housing is arranged near the second housing within a range in which a pitch circle of the fixed idler pulley does not deviate from a swing axis line passing through a hinge in plan view. The mower according to claim 1 or 2, characterized in that 4. The mower according to claim 1, wherein the swing-side idler pulley has a center thereof on a swing axis passing substantially through a hinge.