JP3509962B2 - Working machine lifting height control structure for agricultural tractors - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a working machine lifting height regulation structure for an agricultural tractor.

[0002]

2. Description of the Related Art Conventionally, there is an agricultural tractor in which a working machine such as a cultivator is movably connected via a lifting mechanism having a link mechanism behind a machine body having a driving section and left and right traveling sections.

The lifting mechanism for such an agricultural tractor is generally equipped with a hydraulic lifting cylinder. The cylinder is linked to a lower link of a link mechanism, and the working machine is lifted and lowered by the expansion and contraction of the cylinder. There is.

Further, a position lever is provided in the operating part of the machine body as an elevating lever for operating the hydraulic elevating cylinder, and the working machine is lifted and lowered at a lifting height according to the amount of movement of the position lever by the operator. It is possible.

[0005]

When the agricultural tractor having the above structure is to be traveled, it is necessary to operate the position lever to raise the working machine.

[0006] In particular, when turning in front of a headland in a field, the position lever is quickly operated to raise the working machine to turn, but normally, the lever operation amount at this time is the maximum lift. Often operated to the side.

That is, when turning, the working machine does not necessarily have to be lifted to the maximum height position and may be lifted to the minimum level from the cultivated land, but the lifting height also differs depending on the plowing depth, and also depends on the type of working machine. Since the frying heights are different, a considerable empirical factor is required to determine the appropriate frying height of the working machine by the operation amount of the position lever.

Therefore, in order to surely raise the working machine to the safe position, the position lever must be operated to the maximum lifting position, and it takes time to raise and lower the working machine, resulting in work loss. .

Further, depending on the type of tractor and the type of working machine, if the working machine is lifted up to the maximum lifting height, it may interfere with the machine body. It was desired to have a means to control the height of fried chicken.

An object of the present invention is to provide a working machine lifting height regulation structure for an agricultural tractor which can solve the above problems.

[0011]

SUMMARY OF THE INVENTION According to the present invention, a working machine is movably connected to a rear part of a machine body provided with a driving part and left and right traveling parts via an elevating mechanism, and a position lever of a position lever arranged in the operating part is connected. In an agricultural tractor capable of raising and lowering a work implement at a lifting height according to the amount of movement, the position lever is configured to be movable along the lever guide elongated hole, and the vicinity of the lever guide elongated hole A movement amount regulation means is provided on the control lever so that the movement amount of the position lever in the long hole for the lever guide can be regulated and released freely. Moreover, the movement amount regulation means is linked to the regulation amount adjusting handle and the handle. , A regulation plate mounted on the maximum lifting side of the elevating lever guide long hole so as to be able to move forward and backward, and the regulation plate is advanced and retracted according to the rotation of the regulation amount adjusting handle, and a position is provided at the front end of the regulation plate. Related to a working machine lifting height regulation structure in an agricultural tractor, characterized in that the lever is brought into contact with the moving amount of the lever to the lifting side to make the lifting height of the working machine variable. Is.

[0012]

Further, according to the present invention, a handle shaft, which is rotatably projected rearward of the lever guide elongated hole, is connected to the restricted amount adjusting handle, and a connecting plate provided with the elongated hole is provided on the handle shaft. A slanting regulation plate guide is provided between the handle shaft and the lifting side end of the long hole for the lever guide, which regulates the regulation plate forward and backward in an oblique direction, while at the rear end of the regulation plate. A slanted end face that contacts the slanted regulation plate guide is formed, and further, an engagement pin that engages with the long hole of the connection plate is provided on the regulation plate so as to interlock with the rotation of the regulation amount adjustment handle. Another feature is that the regulation plate is configured to move forward and backward along the slanted regulation plate guide in the front-back diagonal direction.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a side view of an agricultural tractor according to the present invention, and FIG. 2 is a plan view thereof. An agricultural tractor A has a bonnet B arranged at the front of a machine body frame 1 and the bonnet. The engine E is housed in B to configure a prime mover unit 2, and the rotary type tiller working machine D can be freely moved up and down through an elevating mechanism 4 including a three-point link mechanism 3 and the like at the rear end of the machine body frame 1. To form a working unit 5.

A cabin C is provided at the rear of the bonnet B to form an operating section 6, and a fuel tank 7 and a hydraulic oil tank 8 are arranged on the left and right sides of the cabin C, respectively.

The work machine D can be driven via a PTO shaft 9 protruding rearward from the rear end of the machine body frame 1 so that the power from the engine E can be extracted to the outside.

Further, on the lower left and right sides of the machine body frame 1,
Crawler type left and right running parts 10 and 11 are provided respectively.

The left and right running parts 10 and 11 respectively support a driving wheel 13 and a driven wheel 14 at the front and rear ends of the running part frame 12 and a plurality of rolling wheels 15 on the lower surface of the running part frame 12. The tractor A for agricultural use is rotatably supported on the agricultural tractor A by rotatably supporting the roller 16 on the upper surface of the traveling section frame 12, winding the crawler 17 around the outer circumference of the roller 16 and rotating the crawler 17 by the drive wheel 13. It is possible to drive.

Now, the elevating mechanism 4 will be described in detail with reference to FIG. 3. The elevating mechanism 4 is provided with left and right lower pivot parts 31, 32 at the rear part of the machine body frame 1 and left and right lower links 33 of the three-point link mechanism 3. The front ends of the top links 36 are rotatably pivotally attached to the upper center of the rear part of the body frame 1 via the cushioning mechanism 35, and the front ends of the top links 36 are pivotally attached to the left and right lower links 33, 34 and the top. As shown in FIG. 1, the links 36 and the rear ends of the links 36 are pivotally attached to the work machine frame 30 so that the work machine D can be moved up and down.

The buffer mechanism 35 is arranged at the center of the upper portion of the 3P support 37 standing upright at the rear end of the machine frame 1, and the support plate 35 is provided.
A rocking plate 35c is pivotally mounted via a pivot shaft 35b inserted in the lower part of a, and a spring (not shown) is interposed between the rocking plate 35c and the support plate 35a. By elastically supporting the front load from the top link 36 pivotally attached to the middle of the moving plate 35c, the working machine D
Absorbs the upward impact that the
The three-point link mechanism 3 is prevented from being damaged, such as refraction of 36.

The lifting mechanism 4 is a cylinder 3 for lifting left and right.
The lifting cylinders 38, 39 are provided with cylinder pivotal support portions 41, 42 slightly above and to the left and right lower pivotal support portions 31, 32, respectively. The bottoms 38a, 39a of the lifting cylinders 38, 39 are rotatably pivotally mounted, and left and right lift arm pivotal support portions 43, 44 are provided on the upper left and right sides of the 3P support body 37, respectively. The front ends of the left and right lift arms 45 and 46, which are bent in a substantially V-shape, are rotatably pivoted respectively, and the piston rods 4 of the left and right lifting cylinders 38 and 39 are provided in the middle of the lift arms 45 and 46.
The tips of 7,48 are rotatably attached.

Then, the rear end of the left lift arm 45 is interlockingly connected to the middle part of the left lower link 33 via a swing hydraulic cylinder 49, and the rear end of the right lift arm 46 is connected to the right lower link via an ascending / descending connecting rod. By connecting the midway portion of 34, the work machine D connected via the three-point link mechanism 3 is moved up and down by the expansion and contraction operation of the left and right lifting cylinders 38, 39, and by the expansion and contraction operation of the swing hydraulic cylinder 49. The working machine D is rocked to the left and right.

As described above, since the lifting / lowering operation of the working machine D is performed by the hydraulic cylinders 38, 39 for left / right lifting, the lifting / lowering operation of a wide working machine or a heavy working machine is easier than that of a single hydraulic cylinder. In addition, the left-right balance is improved.

In FIGS. 1 and 2, 20 is a front mission case arranged at the rear of the engine E, 21 is a rear mission case which is connected to the front mission case 20 via an intermediate shaft 22, and 23 is the above-mentioned. A drive shaft on the side of the working unit 5 that is interlockingly connected to the PTO shaft 9 via a spline,
24 is a cover of the drive shaft 23, 25 is a front grill that is horizontally openable and closable, 26 is a muffler, 26a is an exhaust port, 27 is an air cleaner, 28 is a dustproof net on the side of the hood B, 29 is a battery , 81 is a condenser, 82 is an oil cooler, 83 is a radiator, and 84 is an auxiliary step provided below the floor frame of the cabin C so as to be freely drawn out.

By the way, the operation of the above-mentioned hydraulic cylinders 38, 39 for raising and lowering the left and right is performed by the position lever 51 arranged in the operating section 6, and the gist of the present invention is to use the position lever 51. In addition to being configured to be shiftable along the lever guide elongated hole 55, a movement amount restricting means S is provided in the vicinity of the lever guide elongated hole 55 to restrict the amount of movement of the position lever 51 in the lever guide elongated hole 55.・
The lifting height position of the working machine D is made variable by making it releasable.

That is, as shown in FIG.
The driving section 6 provided inside has a steering wheel 18 on the front side thereof, and a driving seat 19 mounted on the rear side of the steering wheel 18 so as to be slidable forward and backward and rotatable left and right and fixed. This makes it easier for the driver to turn around when moving backward, and has a comfortable posture.

A lever mounting portion is provided on the right side of the driver's seat 19.
The internal lever guide plate 50a (see FIG. 5) provided with the lever mounting portion 50 is formed with a long hole 55 for the lever guide.
And a position lever 51 and a plowing depth setting lever 52 such as an auto control lever or a draft control lever, which are movable along the same long holes 55 and 56, respectively. Power take-off gears 53, 54 are arranged on the left side. In FIG. 4, reference numeral 76 is a brake pedal, 77 is an instrument panel, 78 is an accessory case, and 79 is an upper lever guide hole provided in the upper panel 50b of the lever mounting portion 50.

The movement amount regulating means S arranged for regulating the movement amount of the position lever 51 to the maximum lifting side is
As shown in FIGS. 5 to 8, the regulation amount adjusting handle 62 and the handle 62 are interlockingly connected to each other, and the internal lever guide plate 50a
A restriction plate 63 attached to the maximum lifting side of the lever guide elongated hole 55 formed so as to be able to move forward and backward, and the restriction plate 63 is advanced and retracted according to the rotation of the restriction amount adjusting handle 62, and the restriction plate 63 is provided. The position lever 51 is brought into contact with the front end of the lever so that the amount of movement of the lever 51 toward the lifting side is regulated.

The restricted amount adjusting handle 62 is provided with a handle shaft 64, which is rotatably projected at the rear of the lever guide elongated hole 55 and protrudes above the upper panel 50b. A connecting plate 66 having a long hole 65 is continuously provided below the position 64 and in contact with the internal lever guide plate 50a.

Further, between the handle shaft 64 and the lifting-side end 55a of the lever guide elongated hole 55, an oblique regulation plate guide 67 for regulating the regulation plate 63 forward and backward by advancing and retreating is provided. At the rear end of the plate 63, a slanted end surface 68 that contacts the slanted restriction plate guide 67 is formed.

Further, an engaging pin 69 that engages with the long hole 65 of the connecting plate 66 is provided on the regulating plate 63 so as to project. As shown in FIG. Projecting downward.

The protruding portion 63a engages with the restriction plate guide elongated hole 70 formed in the internal lever guide plate 50a, and the lower end thereof is held by the washer 71 and the split pin 72 on the back side of the internal lever guide plate 50a. There is.

The regulation plate guide elongated hole 70 is formed in front of the oblique regulation plate guide 67 in parallel with the guide 67.

With this structure, when the regulation amount adjusting handle 62 is rotated, the regulation plate 63 moves forward and backward along the oblique regulation plate guide 67 in association with the rotation of the handle 62. Further, the regulation plate 63 performs a reliable forward / backward movement without falling off.

That is, as shown in FIGS. 6 and 7, when the regulation amount adjusting handle 62 is rotated counterclockwise as indicated by the arrow a, the handle shaft 64 and the coaxial shaft are rotated along with the rotation of the handle 62. A connecting plate 66 connected to 64 rotates in the same direction.

At this time, the engaging pin 69 of the restriction plate 63 engages with the elongated hole 65 of the connecting plate 66, and the lower end of the pin 69 is formed in the internal lever guide plate 50a. Since it is engaged with 70, the regulation plate 63 is pushed and moved diagonally forward while being regulated by the movement of the engagement pin 69 along the regulation plate guide elongated hole 70.

By operating the regulation amount adjusting handle 62, for example, when the working machine D is raised in order to rotate the machine body, when the position lever 51 is operated, the same lever 51 is operated.
Comes into contact with the front end portion 63b of the restriction plate 63, and further movement is restricted (see FIGS. 6 and 8), and the working machine D is raised to an appropriate lifting height. In this case, the working machine D naturally rises in a shorter time than when it rises to the position of the maximum lifting height.

Therefore, even when the working machine D is lowered again, it can be lowered in a shorter time than when it is lowered from the maximum height, and efficient work can be performed without loss of time, and work efficiency is improved.

It should be noted that the setting position of the regulating plate 63 at which the working machine D has an appropriate lifting height depending on the movement amount of the position lever 51 may be set in advance in accordance with working conditions.

Further, because of the simple structure as described above and the easy operation, the setting position of the regulation plate 63 can be changed as appropriate.

In FIGS. 5 and 6, reference numeral 75 denotes an intermediate link provided between the position lever 51 or the plowing depth setting lever 52 and the hydraulic valve. Transmission to the hydraulic valve via 75 causes the above-described left and right lifting cylinders 38, 39 to expand and contract.

In this embodiment, the left and right traveling parts 10 and 11 are of the crawler type, but can be applied to a wheel type agricultural tractor.

[0043]

According to the present invention, the working machine is movably connected to the rear part of the machine body provided with the operating part and the left and right traveling parts through the elevating mechanism, and the working lever is arranged according to the moving amount of the position lever arranged in the operating part. In an agricultural tractor capable of raising and lowering a working machine at a lifting height, the position lever is configured to be movable along the lever guide slot, and the amount of movement is restricted near the lever guide slot. Means for restricting / releasing the movement amount of the position lever in the lever guide long hole, and the movement amount regulating means is interlockingly connected with the regulation amount adjusting handle,
The elevating lever guide is provided with a regulation plate attached to the maximum lifting side of the long hole for guiding forward and backward, and the regulation plate is advanced and retracted according to the rotation of the regulation amount adjusting handle, and a position lever is attached to the front end of the regulation plate. By contacting the lever, the amount of movement of the lever to the lifting side is regulated, and the lifting height of the working machine is made variable, so that the following effects are achieved.

(1) For example, when turning the machine body, it is possible to preliminarily restrict the work machine from the cultivated land to the minimum raised position without hoisting the work machine to the maximum height position. It does not take time, and there is no time loss due to raising and lowering the work machine, and efficient work can be performed.

(2) In particular, the above-mentioned movement amount regulation means comprises a regulation amount adjustment handle and a regulation plate operatively connected to the handle and attached to the maximum lifting side of the long hole for the position lever guide so as to be able to move forward and backward. Since the regulation plate is advanced and retracted according to the rotation of the regulation amount adjusting handle and the position lever is brought into contact with the front end portion of the regulation plate, the configuration is simple and the operation is easy.

Therefore, the setting position of the regulation plate can be changed as appropriate, and for example, it is easy to change the lifting height of the working machine depending on the plowing depth and the lifting height depending on the type of the working machine. It is not necessary to decide the appropriate lifting height of the work machine by the amount of operation of the position lever, and it is possible to work safely even if you are not skilled in the operation of the tractor.

[Brief description of drawings]

FIG. 1 is a side view of an agricultural tractor according to the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is an explanatory view showing a lifting mechanism.

FIG. 4 is an explanatory diagram showing a driving unit.

FIG. 5 is an explanatory diagram of a lever mounting portion.

FIG. 6 is a plan view of a movement amount regulation unit.

FIG. 7 is a perspective view of the same.

FIG. 8 is an explanatory view according to the same sectional view.

[Explanation of symbols]

A agricultural tractor D work machine S Movement amount regulation means 6 Driving department 10 Left running part 11 Right running part 51 Position lever 55 Long hole for lever guide 55a Fried end 62 Regulated amount adjustment handle 63 Restriction plate 63a front end 64 handle shaft 65 long hole 66 Connection plate 67 Oblique regulation plate guide 68 Beveled end face 69 engagement pin

─────────────────────────────────────────────────── ─── Continuation of front page (56) Bibliographic references Sho 55-10500 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) A01B 63/10 G05G 5/04

Claims (2)

(57) [Claims] 1. A working machine (D) is movably connected to a rear part of a machine body provided with a driving section (6) and left and right traveling sections (10) and (11) through an elevating mechanism (4) to perform the above-mentioned operation. Position lever arranged in the part (6)
In an agricultural tractor configured to raise and lower the working machine (D) at a lifting height according to the movement amount of (51), the position lever (51) can be moved along the long hole (55) for lever guide. In addition to the above, the movement amount restricting means (S) is provided in the vicinity of the lever guide elongated hole (55), and the movement amount of the position lever (51) in the lever guide elongated hole (55) can be regulated and released. In addition, the above movement amount regulation
The means (S) includes a regulation amount adjustment handle (62) and the same handle (6
Interlockingly connected to 2), the maximum lift of the lifting lever guide slot (55)
It has a regulation plate (63) attached to the back side so that it can move back and forth .
The regulation plate (63) is rotated according to the rotation of the regulation amount adjusting handle (62 ).
To the front end (63b) of the regulation plate (63).
Fried in the same lever (51) by abutting the lever (51)
Variable the lifting height of the working machine (D) by restricting the amount of movement to the side
The structure for regulating the lifting height of work equipment in agricultural tractors, which is characterized by 2. A lever girder is attached to the regulation amount adjusting handle (62) .
Handle shaft that is rotatably projected behind the long hole (55) for id
(64) are connected, and the handle shaft (64) is provided with an elongated hole (65) .
Connect the connecting plate (66) provided in series , and handle shaft (64) and lever
Fried end of Ido long hole (55) between (55a), regulating plates (6
3) Oblique regulation plate guide that moves forward and backward by regulating diagonally
While providing a de (67), said slant regulation to the rear end of the regulating plate (63)
Form the slanted end face (68) that contacts the plate guide (67) and
Also, the restriction plate (63) is engaged with the long hole (65) of the connecting plate (66).
The engaging pin (69) for
Interlock with the rotation of (62) to move the restriction plate (63) to the oblique restriction plate guide (6
The lifting height control structure for a working machine in an agricultural tractor according to claim 1 , wherein the structure is configured to move forward and backward obliquely along 7) .