JPH0620362B2 - Agricultural tractor-working machine connection device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a connecting device for an agricultural tractor and a working machine.

(Prior Art) In the publicly known Japanese Utility Model Laid-Open No. 58-59402, the base of the central top link is located at the upper center of the rear part of the agricultural tractor, and the bases of the left and right lower links are located at the lower left and right positions of the rear part of the agricultural tractor. Even if the working machine is attached to the front portion of the central top link and the front portions of the left and right lower links via a connecting member, the connecting member is a single piece when viewed from the front-rear direction. A steel material is bent downward into a U-shape, and a pair of left and right standing mounting plates and an inclined mounting plate projecting obliquely rearward are provided at the center of the upper part of the connecting member, and the upper connecting shaft is attached to the standing mounting plate. Through-fixing and forming an upper engaging shaft on the inclined mounting plate to form a mounting portion A,
The inner ends of the lower shafts projecting outward are fixed to both left and right lower ends of the connecting member to form a free end portion BC for attachment, and the connecting member includes the attaching portion A at the upper center and the left and right lower end portions. And a space portion D formed between the mounting free end portions BC of the central top link on the connecting shaft of the mounting portion A to the lower shaft of the free end portion BC of the left and right lower links. A structure is described in which the tip portions are respectively attached and the working machine is attached to the upper engaging shaft of the attaching portion A and the lower shaft of the free end portion BC of the connecting member.

(Problems to be Solved by the Invention) In the publicly known one, the connecting member is provided with a pair of left and right standing mounting plates and an inclined mounting plate that obliquely projects rearward,
Since the upper connecting shaft is penetratingly fixed to the upright mounting plate and the upper engaging shaft is formed on the inclined mounting plate, the structure is complicated, and when the connecting member is attached to the link mechanism of the tractor, the inclination is increased. The mounting plate had to be mounted so that it was located on the rear side, and mounting was troublesome.

Further, the free end portion BC for mounting is configured by fixing the inner ends of the lower shaft protruding outward to both left and right lower ends of the connecting member, and since the lower shaft is fixed by the cantilever structure, the mounting strength is improved. There's a problem.

(Means for Solving the Problem) Therefore, according to the present invention, the base of the central top link 4 is located at the upper center of the rear part of the agricultural tractor 1, and the bases of the left and right lower links 5, 5 are located at the lower left and right positions of the rear part of the agricultural tractor 1, respectively. Then, the working machine is connected to the front portion of the central top link 4 and the front portions of the left and right lower links 5 and 5 via a connecting member 11.
16 is attached, and a PT is provided at a vertical intermediate position between the central top link 4 and the lower link 5 at the rear of the agricultural tractor 1.
An O shaft 10 is provided so that the working machine 16 can be driven by the PTO shaft 10. The connecting member 11 is formed by bending one steel material when viewed from the front-rear direction into a mountain shape with its lower end opened. At the center of the upper portion of the connecting member 11, a pair of right and left mounting plates 39, 39 are provided.
The upper connecting shaft 12 is fixedly penetrated to 39, 39, and both sides of the upper connecting shaft 12 constitute the mounting portion A as the upper engaging shafts 14, 14 projecting from the mounting plates 39, 39. Secure the downward U-shaped bifurcated mounting plates 40, 40 to both lower ends of
Lower connecting shafts 13 and 13 are fixed to the bifurcated mounting plates 40 and 40, respectively, and outer ends of the lower connecting shafts 13 and 13 are protruded from the bifurcated mounting plates 40 and 40 to form lower engaging shafts 15 and 15. Free end B for mounting
C, and the connecting member 11 is a mounting portion A at the center of the upper part.
And a space portion D formed between the left and right lower end portions for attachment free ends BC, and the tip of the central top link 4 is attached to the upper connecting shaft 12 of the attachment portion A by the free end portion BC. The tip parts of the left and right lower links 5 and 5 are attached to the lower connecting shafts 13 and 13, respectively, and the working machine 16 includes the upper engaging shafts 14 and 14 of the mounting portion A of the connecting member 11 and the free end portion BC. This is a connecting device for an agricultural tractor and a working machine that are respectively attached to the lower engaging shafts 15, 15.

(Embodiment) An embodiment of the present invention will be described with reference to the drawings. 1 is an agricultural tractor having front wheels and rear wheels 2, and a so-called three-point mounting mechanism 3 is provided at a rear portion of the agricultural tractor 1. The three-point mounting mechanism 3
Is formed of one upper top link 4, two lower lower links 5, two lift arms 6, two rods 7, etc.

The upper top link 4 can be freely moved to Shinjuku by a turnbuckle, and the lift arm 6 is vertically rotated around a hydraulic rotation shaft 9 by a hydraulic device 8 attached to the rear part of the agricultural tractor 1, and the upper end of the rod 7 is moved to the lift arm 6 And the lower end of the rod 7 is pivotally attached to the middle of the lower lower link 5 in the front and rear.

When the lift arm 6 is vertically rotated by the hydraulic device 8,
The height of the lower lower link 5 can be adjusted.

Reference numeral 10 denotes a PTO shaft projecting to the rear of the agricultural tractor 1, which is provided at an intermediate position between the upper top link 4 and the lower lower link 5.

Reference numeral 11 is a connecting member for connecting the three-point mounting mechanism 3 and various working machines attached to the three-point mounting mechanism 3, and one pipe-shaped steel pipe is bent and formed in a chevron shape with an open lower end, and an upper central portion. The center upper top link 4 is provided with a mounting portion A, and the left and right lower ends are provided with free end portions BC for mounting the left and right lower lower links 5 and 5 with a space D therebetween.

An upper connecting shaft 12 is provided at a mounting portion A at the center of the upper portion of the connecting member 11, and a rear end of the upper top link 4 is provided on the shaft 12 and free mounting end portions BC on both left and right lower sides of the connecting member 11. Lower connecting shafts 13 and 13 are provided on the lower connecting shafts 13 and 13, and the rear ends of the lower lower links 5 are rotatably attached to the lower connecting shafts 13 and 13, respectively.

The upper connecting shaft 12 of the connecting member 11 is fixed by penetrating through the pair of left and right mounting plates 39, 39 provided in the mounting portion A.
Both sides of 12 project in the axial direction from the mounting plates 39, 39 to form upper engaging shafts 14, 14. Further, the lower connecting shafts 13, 13 are
The connecting member 11 is fixed by penetrating through the downward U-shaped bifurcating mounting plates 40, 40 provided at both left and right lower ends of the connecting member 11, and the lower connecting shafts 13, 13 are more than the bifurcating mounting plates 40, 40. Lower engaging shafts 15, 15 are formed so as to project in the axial direction, respectively, and a working machine 16 described later is attached to the upper engaging shaft 14 and the lower engaging shaft 15 to perform various works.

An example of coupling the working machine 16 and the connecting member 11 is performed by engaging the upper hook 17 with the upper engaging shaft 14 and the lower engaging groove 26 with the lower engaging shaft 15.

The upper hook 17 is an inverted U-shaped hook formed on the upper engaging rod 20 having one end fixed to the frame 19 of the working machine 16,
Tilt the lower part closer to the agricultural tractor 1 side.

Reference numerals 21 and 21 are guide collars for guiding when the upper engaging shaft 14 and the upper hook 17 are engaged with each other.

The movable hook 18 that closes the lower engaging groove 26 of the working machine 16 that is connected to the lower engaging shaft 15 of the connecting member 11 is formed in a hook shape as shown in FIG. Engagement rod 23,
Axed to 23.

As shown in FIG. 6, the tip ends of the lower engaging rods 23, 23 have a forked portion 25.
The movable hook 18 is pivotally attached 22 between the forked portions 25. The bifurcated portion 25 is formed with a lateral groove-shaped engaging groove 26 that is open on the agricultural tractor 1 side.

One end of a rotating rod 29 is rotatably attached to the outer surface of the curved portion 27 of the movable hook 18, a spring 30 is wound around the rotating rod 29, and the other end of the rotating rod 29 is a lower part. It is inserted into a shaft 31 rotatably attached to an engagement rod 23. That is, when the movable hook 18 is in the engagement position, it is constantly urged by the spring 30 to come into contact with the stopper 32 and stop at the closed position. The fifth
When in the closed position as shown in the figure, since the shaft attachment 28 is closer to the working machine 16 than the line connecting the shaft attachment 22 and the shaft 31, the movable hook 18
Is always in contact with the stopper 33 on the working machine 16 side and is in the non-closed position.

Reference numeral 35 is a guide flange similar to the guide flange 21, and is formed at each outer end of the lower engagement shaft 15.

A rotary rotor 36 is attached to the lower end side of the frame 19, and the rotary rotor 36 is connected to the PTO shaft 10 to rotate. Reference numeral 37 is a rear cover, which moves up and down when the operating rod 38 is operated to level the floor soil.

(Operation) Next, the operation will be described.

The connecting member 11 is arranged in the rear part of the agricultural tractor 1 regardless of the front-back direction, the rear part of the upper top link 4 is pivotally attached to the upper connecting shaft 12 provided in the mounting portion A above the connecting member 11, and the lower lower link. The rear parts 5, 5 are respectively attached to the lower connecting shafts 13, 13 provided on the lower mounting free end BC of the connecting member 11,
In that state, the operator rides on the agricultural tractor 1, operates the hydraulic device 8 to rotate the lift arm 6, sets the height of the upper engaging shaft 14 to a position slightly lower than the upper hook 17, and then retracts as it is. As described above, the lower engaging shaft 15 does not engage with the engaging groove 26, but the upper engaging shaft 14 advances to a position where it engages with the upper hook 17.

In this state, when the hydraulic device 8 is operated to move the lift arm 6 upward, the lower link 5 is pulled up by the rod 7, so that the upper engaging shaft 14 moves upward and engages the upper hook 17 from the lower side.

Further, when the lift arm 6 is rotated upward, the upper engagement shaft 14 acts so as to lift the entire working machine 16, so that the lower part of the working machine 16 moves so as to rotate toward the agricultural tractor 1 side and is engaged. The claw portion 34 of the movable hook 18 closing the groove 26 strongly hits the lower engaging shaft 15 on the tractor 1 side.

Then, against the elastic force of the spring 30, the claw portion 34 is moved upward by the depth of the lower engaging shaft 15. In this state, the engaging groove 26
Is moved to the agricultural tractor 1 side, the claw portion 34 will move to the lower engaging shaft.
The lower engaging shaft 15 engages with the engaging groove 26, and the claw portion 34 returns to the state of FIG. 4 again by the elasticity of the spring 30.

Next, the PTO shaft 10 and the working machine 16 are connected by an arbitrary shaft.

In this case, the mounting portion A of the connecting member 11 is provided with a pair of left and right upper mounting plates 39, 39 at the center of the upper portion of the connecting member 11, and the upper connecting shaft 12 is fixed to the mounting plates 39, 39 by penetrating. Since both sides of the upper connecting shaft 12 are configured as upper engaging shafts 14, 14 projecting from the mounting plates 39, 39, the connecting member 11 can be mounted in any direction when it is mounted on the agricultural tractor 1. Further, it is possible to secure the strength against the moment of twist as compared with the known example.

The free ends BC for attachment are fixed to the lower left and right ends of the connecting member 11 by bifurcating mounting plates 40, 40 having a downward U-shape, and the lower connecting shafts are attached to the bifurcating mounting plates 40, 40. 13 and 13 are fixed through, respectively, and the outer ends of the lower connecting shafts 13 and 13 are bifurcated mounting plates.
Since the lower engaging shafts 15 and 15 are made to project from the 40 and 40, the lower connecting shafts 13 and 13 and the lower engaging shafts 15 and 15 are firmly supported by the bifurcated mounting plates 40 and 40.

Then, when the working machine 16 is removed, the working tractor 1 is lowered from the agricultural tractor 1, the connecting shaft between the PTO shaft 10 and the working machine 16 is removed, and the movable hook 18 is rotated so as to hit the stopper 33 with a fingertip and the claw portion is removed. When the hydraulic gear 8 is operated to lower the lift arm 6 in the state where the opening 34 is opened, the lower engaging shaft 15 is engaged with the engaging groove.
At the same time as coming out of 26, the upper engaging shaft 14 comes off the upper hook 17 and can be easily released.

When the lift arm 6 is lowered, the connecting member 11 of the present application is used.
Has a chevron shape with its lower end open, and free left and right ends BC for mounting, which are spaces D between them, are formed at both left and right lower ends, so that the connecting member 11 does not interfere with the PTO shaft 10 of the tractor and is large. Can be moved up and down.

(Effect) As described above, the known connecting member is provided with a pair of left and right standing mounting plates and an inclined mounting plate that obliquely protrudes rearward from the mounting portion A, and the upper connecting shaft is fixed through the standing mounting plate. Since the upper engaging shaft is formed on the inclined mounting plate, the structure is complicated, and when the connecting member is mounted on the link mechanism of the tractor, the inclined mounting plate is mounted so as to be located on the rear side. It had to be installed, which was troublesome to wear.

Further, the free end portion BC for mounting is configured by fixing the inner ends of the lower shaft protruding outward to both left and right lower ends of the connecting member, and since the lower shaft is fixed by the cantilever structure, the mounting strength is improved. There's a problem.

However, according to the invention, the base of the central top link 4 is attached to the upper center of the rear of the agricultural tractor 1, and the bases of the left and right lower links 5 and 5 are attached to the lower left and right positions of the rear of the agricultural tractor 1, respectively. 4 and the left and right lower links 5, 5 to which work implement 16 is attached via a connecting member 11, and the middle top link 4 and the lower intermediate position between the central top link 4 and the lower link 5 at the rear of the agricultural tractor 1 are attached. To P
A TO shaft 10 is provided so that the working machine 16 can be driven by the PTO shaft 10. The connecting member 11 is formed by bending one steel material when viewed from the front-rear direction into a mountain shape with its lower end opened. Then, in the upper center of the connecting member 11,
A pair of left and right mounting plates 39, 39 are provided upright, the upper connecting shaft 12 is fixed through the mounting plates 39, 39, and both sides of the upper connecting shaft 12 project from the mounting plates 39, 39. Axis 14, 14
And a downward connecting U-shaped bifurcated mounting plate 40, 40 is fixed to both left and right lower ends of the coupling member 11, and the bifurcated mounting plate 40, 40 has a lower coupling shaft 13, Each of the lower connecting shafts 13 and 13 has a bifurcated mounting plate 40,
A free end portion BC for attachment is formed as a lower engaging shaft 15 by projecting from 40, and the connecting member 11 is provided between the attachment portion A at the center of the upper portion and the free end portions BC for attachment at the left and right lower ends. And a space D formed therein, and the tip of the central top link 4 is attached to the upper connecting shaft 12 of the mounting portion A, and the left and right lower links 5 and 5 are attached to the lower connecting shafts 13 and 13 of the free end BC. An agricultural tractor, which is attached to the upper engaging shafts 14 and 14 of the attaching portion A of the connecting member 11 and to the lower engaging shafts 15 and 15 of the free end BC, respectively. Since it is a connecting device for the working machine, it can be attached to the agricultural tractor 1 regardless of the direction of the connecting member 11 and the workability is improved.

(B) Since the tip of the central top link 4 of the agricultural tractor 1 is mounted on the upper connecting shaft 12 of the mounting portion A and the working machine 16 is mounted on the upper engaging shafts 14, 14 of the mounting portion A, the structure is simple. .

(C) The free end portions BC for attachment have a structure in which the lower connecting shafts 13, 13 are fixed through the two forked mounting plates 40, 40 fixed to the left and right lower ends of the connecting member 11, respectively. And the mounting strength of the lower engagement shafts 15 and 15 is improved.

Has the effect.

[Brief description of drawings]

1 is an overall side view, FIG. 2 is an overall side view when the engagement shaft and the upper hook are engaged, FIG. 3 is a front view of a connecting member, and FIG.
FIG. 5 is a state diagram showing the lower hook in the engaged position, FIG. 5 is a state diagram showing the lower hook in the non-engaged position, and FIG. 6 is an enlarged plan view of an essential part. Explanation of reference numerals 1 ... Agricultural tractor, 2 ... Rear wheel, 3 ... Three-point mounting mechanism, 4 ... Upper top link, 5 ... Lower lower link, 6 ... Lift arm, 7 ... Rod, 8 ... … Hydraulic device, 9 …… Hydraulic rotary shaft, 10 …… PTO shaft, 11 …… Coupling member, 12 …… Upper connecting shaft, 13 …… Lower connecting shaft, 14 …… Upper engaging shaft, 15 …… Lower part Engaging shaft, 16 …… Working machine, 17 …… Upper hook, 18 …… Movable hook, 19 …… Frame, 20 ……
Upper engaging rod, 21 ... Guide collar, 22 ... Shaft attachment, 23 ... Lower engaging rod, 24 ... Space, 25 ... Forked portion, 26 ... Engaging groove, 27 ...
… Curved part, 28 …… Shaft attachment, 29 …… Rotating rod, 30 …… Spring, 31 …… Shaft, 32 …… Stopper, 33 …… Stopper,
34 …… claw part, 35 …… guide collar, 36 …… rotating rotor, 37…
… Rear cover, 38 …… Operating rod, 39 …… Mounting plate, 40 …… Bending plate, A …… Mounting part, B, C …… Free end part for mounting,
D: Space section.

Claims (1)

[Claims] 1. A central top link 4 is axially fixed to the upper central part of the rear part of the agricultural tractor 1, and the base parts of the left and right lower links 5, 5 are axially fixed to the lower left and right positions of the rear part of the agricultural tractor 1, respectively. 4 and the left and right lower links 5, 5 via the connecting member 11 to the working machine 1
6 is attached to the rear part of the agricultural tractor 1, and a PT is provided at an intermediate position between the central top link 4 and the lower link 5.
An O shaft 10 is provided, and the PTO shaft 10 allows the working machine 16 to operate.
The connecting member 11 is formed by bending one steel material into a chevron shape with its lower end opened when viewed from the front-rear direction. Mounting plates 39, 39 that stand upright are provided, the upper connecting shaft 12 is fixed through the mounting plates 39, 39, and both sides of the upper connecting shaft 12 project from the mounting plates 39, 39. A mounting portion A is formed as 14, and downwardly-shaped U-shaped bifurcated mounting plates 40, 40 are fixed to both left and right lower ends of the coupling member 11, and the lower coupling shaft 13 is attached to the bifurcated mounting plates 40, 40. , 13 are respectively fixed through, and the outer ends of the lower connecting shafts 13, 13 are bifurcated mounting plates 40,
A free end portion BC for attachment is formed as a lower engaging shaft 15 by projecting from 40, and the connecting member 11 is between the attachment portion A at the center of the upper portion and the free end portions BC for attachment at the left and right lower ends. The upper connecting shaft 12 of the mounting portion A, the tip of the central top link 4 and the lower connecting shafts 13, 13 of the free end BC of the left and right lower links 5, 5. An agricultural tractor having tip portions attached thereto, and the working machine 16 attached to the upper engaging shafts 14 and 14 of the attaching portion A of the connecting member 11 and the lower engaging shafts 15 and 15 of the free end portion BC, respectively. Work machine coupling device.