JP3088630B2 - Rotating cover operating device for tillage device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary cover operating device for a tilling device, wherein a rotary cover forming a rotary cover for covering a tilling portion of a tractor tilling device can be easily operated from a driver's seat.

[0002]

2. Description of the Related Art Conventionally, a rotary cover of a tractor is provided rotatably so as to cover a rotary cover behind a main cover that covers an upper part of a cultivating portion so as to adjust the height thereof, and to operate the rotary cover back and forth. 2. Description of the Related Art There are known ones that are operated by operating an electric cylinder installed between a rotating cover and a main cover, and those that are operated by operating an operation lever that is connected to the rotating cover and a link mechanism.

[0003]

However, in the conventional operation using an electric cylinder, the switch is operated to move the rotary cover back and forth, and this switch operation is mistaken or mud adheres to the sliding rail. If it is operated in a state where it is difficult to move, the cylinder member is forcibly operated by the strong force of the cylinder, so that there is a problem that the rail member and the cover are deformed and possibly damaged. In addition, in the operation by swinging the operation lever, the angle between the fulcrum of the link mechanism and the point of action is substantially vertical when the rotating cover is swung to the rear, so that the operation lever is swung from the rear to the front. When the operation is started, the operation force at the start of the operation becomes large, and it is difficult to swing the operation lever.

[0004]

A rotary cover operating device for a tilling device according to the present invention for solving the above-mentioned problems is provided with a main cover which is connected to the back of a driver's seat 3 of a tractor 1 so as to be able to move up and down and covers a tilling portion 7. And a rotary cover 17 provided at the rear of the main cover 6 so as to be movable back and forth.
An operation lever 31 protruding from the driver's seat 3 on the side of the tillage device 2, and an operation link 34 connected to the operation lever 31 and a drive link 21 connected to the rotating cover 17. In the mechanism for connecting the operating lever 31 and the rotating cover 17 with a link mechanism constituted by connecting the operating link 34 and the driving link 21, The angle A formed between the fulcrums 19 and 23 and the action point 36 forms a hanging vertical at substantially the center of the swing range of the operating lever 31, and the operating lever 3
At the rear end of the first swing range, the fulcrum arrangement is such that the angle A between the fulcrums 19, 23 and the action point 36 forms an obtuse angle that does not reach horizontal.

[0005]

According to the above structure, by pivoting the operation lever 31 back and forth, the rotary cover 17 connected to the operation lever 31 by the operation link 34 and the drive link 21 is moved back and forth. Is the lightest at the start of the swinging operation from the rear end of the swing range to the front, and becomes the maximum operating force when the operating lever 31 in the middle of swinging is almost vertical to the ground, and then swings forward. Therefore, the operation force is changed so as to be lighter.

[0006]

1 shows a side view of a rotary tilling apparatus 2 provided behind a tractor 1 to which the present invention is applied. The tillage device 2 is mounted on a three-point link hick mechanism 4 at the rear of the driver's seat 3 of the tractor 1 and can move up and down as the link hick mechanism 4 swings up and down.

Next, the configuration of the tillage device 2 will be described. The main cover 6 is fixed to the gear case 8, the chain case 9 and the like so as to cover the upper part of the rotary 7, and a rail guide 11 is provided on the upper surface of the main cover 6. Rollers 12 are supported on both surfaces of the rail guide 11 so as to face each other and are rotatable.

The roller 12 is provided with a guide rail 13 having an inwardly curved U-shaped cross section so as to be fitted therein and slidably provided. The rear end of the guide rail 13 is laterally rearward of the guide rail 13. It is fixed near the center of the horizontal frame 14 provided. Further, the lower surface of the horizontal frame 14 is provided with a hinge cover 16 to cover the upper part of the rotary 7 from behind, and the rear end is curved outward.
Are provided rearward. By the above-mentioned mechanism, the rotating cover 17 moves the main cover 6 via the guide rail 13.
, And can swing back and forth, so that the height of the rear covering start with respect to the rotary 7 is changed by the forward and backward swing. On the upper surface near the center of the horizontal frame 14, a bracket 18 having a substantially U-shape as viewed from the front and rear is opened and fixed upward.

On the other hand, as shown in FIGS. 1 and 2, above the main cover 6, top masts 22a and 22b are erected from the gear case 9 so as to face left and right, and substantially at the center of the top masts 22a and 22b. A fulcrum shaft 23 is supported in the vicinity so as to protrude rightward. A mounting member 24 is fixed to the tip of the projecting portion of the fulcrum shaft 23. The mounting member 24 has a pin 26 protruding therefrom and a spring mounting portion 27 provided. And the pin 2
An operation lever 31 is rotatably supported by a boss 28 to the left and right through a boss 28. Further, a spring attachment portion 29 protruding from the operation lever 31 and the spring attachment portion 27 are connected by a spring 32. X of operation lever 31
Biased in the direction. With this structure, the fulcrum shaft 23 and the operation lever 31 are integrated in the front-back direction.

On the right side of the top mast 22a, a lever guide 33 having an L-shaped cross section protruding rightward.
The operation lever 31 is provided in the lever guide 33 in the front-rear direction guide hole 33 shown in FIG.
a. At the front and rear ends of the guide hole 33a, a notch-shaped locking portion 33b is provided to the left.
Therefore, the operation lever 31 is pressed against the left side wall of the guide hole 33a or the locking portion 33b by the urging force of the spring 32.

With the mounting structure of the operating lever 31 described above, the operating lever 31 is swung by hand or the like to the substantially center position of the guide hole 33a against the above-mentioned biasing force, so that the guide hole 33a is supported by the fulcrum shaft 23 as a fulcrum. Can be operated to swing back and forth along. Then, at this time, when the operation lever 31 is swung back and forth and positioned at the side of the locking portion 33b, when the user releases his / her hand, the operating lever 31 is engaged and fixed to the locking portion 33b by the urging force. The tip of the operation lever 31 protrudes toward the driver's seat 3 and is located at a position where the operator at the driver's seat can reach the rear of the driver's seat even if the operation lever 31 is swung to the rear.

Further, both top masts 2 of the fulcrum shaft 23 are provided.
An operation link 34 is fixed upward between the 2a and 22b, and one end of the drive link 21 is rotatably supported at the tip of the operation link 34 via a shaft 36. The other end of the drive link 21 is connected to the bracket 18
The pivoting cover 17 is rotatably supported via a fulcrum shaft 19, and the rotating cover 17 swings back and forth with the swinging of the operation lever 31 by the mechanism described above. That is, since the fulcrum shaft 23 rotates back and forth by swinging the operation lever 31 back and forth as described above, the rotation of the fulcrum shaft 23 causes the operation link 34 to swing back and forth around the fulcrum shaft 23 as a fulcrum,
The drive link 21 moves back and forth by the swing of the operation link 34. The guide rail 13 moves back and forth with the movement of the drive link 21, and the rotating cover 17 moves back and forth via the horizontal frame 14 with the movement of the guide rail 13. For this reason, it is a simple and lightweight mechanism and a low cost compared with the conventional electric type.

At this time, a straight line connecting the fulcrum shaft 19 serving as the fulcrum of the drive link 21 and the shaft 36 serving as the action point and a straight line connecting the fulcrum shaft 23 serving as the fulcrum of the operation link 34 and the shaft 36 serving as the action point are shown. The angle A is 18 when the operation lever 31 is swung to the rear and the rotating cover 17 is positioned to the rear.
The angle becomes an obtuse angle close to 0 ° (not horizontal), and when the operation lever 31 is almost vertical from the ground, the vertical angle (9
0 °), and furthermore, the operating lever 31 is swung to the forefront and the rotating cover 17 is positioned at the forefront so as to form an acute angle. The point r) is configured such that the length r is as small as possible. The details of the relationship between the angle A and the length r will be described later.

The tilling operation by swinging the rotating cover 17 back and forth will be described below. When performing shallow tillage work, as shown in FIG. 4, the rotating cover 17 is located at the rearmost position, and the lower surface of the rear end of the rotating cover 17 is lowered with respect to the rotary 7. As a result, it is possible to satisfactorily level the cultivated soil surface on the lower surface of the rear end, and to prevent scattering of soil during shallow tillage. On the other hand, when performing deep tilling work, as shown in FIG. 1, the rotating cover 17 is positioned at the forefront, and the lower surface of the rear end of the rotating cover 17 is higher than the rotary 7. This allows the rotary 7 to be plowed deep in the soil and to level the ground surface.

Next, the operating force F required when the operating lever 31 swings will be described with reference to FIG. First, assuming that the load applied to the drive link 21 is W, the moment M applied to the operation link 34 is the aforementioned angle A (0 ° <
A <180 °), M = r · WSinA. When the operating lever 31 is at the rearmost position (a) of the swing range and when the operating lever 31 is at the frontmost position (b) of the swing range, the moments M are M1 and M2, respectively, and the angles A are A1 and A2, respectively. Then M1 = r · WSinA1,
M2 = r · WSin (180 ° −A2) = r · WSin
A2. Further, assuming that the swing position of the operation lever 31 at which A = 90 ° is (c), as described above, the structure (c)
Is located between (a) and (b), and when the above moment is M3, M3 = r · WSin90 ° = r · W
Becomes At this time, when the magnitudes of M1, M2, and M3 are compared, 0 <SinA <1 holds, so that M1 <M3, M2 <
M3.

On the other hand, the base end of the operating lever 31 (the fulcrum shaft 2)
Assuming that the length from 3) to the action point (operating point) is R, the operating force F1, F2, at each of the above (a), (b), and (c) positions
F3 is F1 = M1 / R, F2 = M2 / R, F3 = M3 /
R, and F1 <F3, F2 <F3 from the magnitude relationship between the moments M1, M2, and M3. That is, when the operation lever 31 is swung forward from the rearmost position (a) of the swing range, the operation force F gradually increases from F1 at the time of starting the operation lever 31, and A = 90 ° during the swing. The maximum operation force F3 is obtained when the vehicle is swung forward, and then becomes smaller, and becomes F2 when it is positioned at the forefront (b). The operating force F when swinging backward from the forefront (b) is opposite to the above when the operating lever 31 is started backward to start.
It changes from 2 to F3 → F1.

The angles A and r have such a relationship that each of the above-mentioned F1, F2 and F3 becomes as small as possible and that F1 becomes minimum in order to facilitate the operation of the operation lever 31. In other words, in order to fix the R because it is related to the ease with which the operation lever 31 is easily gripped, F1, F2, and F3 are reduced by reducing M1, M2, and M3, but M1, M2, and M3 are each reduced. Therefore, first, r is made as small as possible, and A further makes A1 1
An obtuse angle as close as possible to 80 ° is set and M1 is made as small as possible. Therefore, the operating lever 3
The operation force F1 at the time of starting the operation lever 31 when the device 1 swings forward from the rearmost position (a) of the swing range, which is the position farthest from the worker, is the minimum operation force. Since A2 is determined by A1 and the swing stroke of the rotating cover 17 (operation lever 31), it depends on A1.
Therefore, the value of M2 is determined so as to be dependent on M1, and F1 ≦ F2 <F3.

Note that M1 is SinA when A1 = 180 °
1 = 0, and the minimum value of M1 = 0 is obtained. However, if this condition is applied, a large force is required due to inertia and the like when the operation lever 31 is started. Therefore, the above A1 = 180
° is not applicable. Specifically, 135 ° ≦ A1 ≦ 160
° degree.

The moment M applied to the operation link 34
, The deflection of the operation link 34 is also reduced, the vibration and noise are reduced, and the operation link 34 itself is made compact.

[0020]

According to the present invention configured as described above, the operating lever has the lightest operating force at the start of the swing operation from the rear end of the swing range to the front, and the operating lever in the middle of the swing is It becomes the maximum operating force when it is almost vertical from the ground,
Thereafter, the operation force becomes lighter as it swings forward, so that it becomes easier to swing the operation lever.

[Brief description of the drawings]

FIG. 1A is a side view showing a main part of a tractor.
(B) is a view in the direction of arrow B.

FIG. 2 is a rear view of an operation lever unit.

FIG. 3 is a plan view of a lever guide.

FIG. 4 is a side view showing a state during a shallow tillage operation.

FIG. 5 is a partial side view showing an operation force when the operation lever swings.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tractor 2 Tilling device 3 Driver's seat 6 Main cover 7 Rotary (tilling part) 17 Rotating cover 19 Support shaft (fulcrum) 21 Drive link 23 Support shaft (fulcrum) 31 Operating lever 34 Operation link 36 Shaft (operating point) A angle (A)

Claims (1)

(57) [Claims] 1. A tilling device (2) having a main cover (6) which is connected to a driver's seat (3) of a tractor (1) so as to be vertically movable and covers a cultivating portion (7), and the main cover (6). Rotating cover (1)
7) and an operation lever (31) protruding from the driver's seat (3) on the side of the tillage device (2).
The operation lever (31) and the rotation cover are a link mechanism formed by connecting the operation link (34) connected to the rotation side and the drive link (21) connected to the rotation cover (17). (17) and the operation lever (3
In the mechanism for moving the rotary cover (17) back and forth by the back and forth swing of 1), the operation link (34) and the drive link (2)
The angle (A) formed by the fulcrums (19), (23) and the action point (36) of (1) forms a vertical vertical at substantially the center of the swing range of the operating lever (31), and the swing of the operating lever (31) is established. At the rear end of the moving range, the fulcrums (19) and (23) and the operating point (3)
6) A rotating cover operating device of a tilling device having a fulcrum arrangement in which an angle (A) formed by the fulcrum forms an obtuse angle that does not reach horizontal.