JPH01141503A - Method for coupling working machine to tractor - Google Patents

Abstract

PURPOSE:To achieve accurate and quick coupling of a working machine to a tractor by contracting a top link in the scooping and attaching of a triangular frame. CONSTITUTION:A coupling member 14 is scooped from the lower coupling parts 18, 18 by the extension of a top link 10 in the course of approaching a tractor 1 toward a working machine and is swingably held with coupling parts 22, 22 at the rear side close to the working machine R. The scooping and coupling part 22 is positioned below an upper engaging part 88, a three-point link mechanism 9 is raised to couple the scooping and coupling part 22 to the upper engaging part 88 and is further raised while contracting the top link 10 to transfer the lower coupling parts 18, 18 of the coupling member 14 around the upper engaging part 88 toward the lower engaging part 89 of the working machine R until the working machine R is coupled to the tractor.

Description

[Detailed Description of the Invention] (Industrial Application Field) Motokura Tsui relates to a method for attaching a working machine to a tractor, and is used to attach a rotary tiller to a tractor using a three-point linkage mechanism. .

(Prior technology) A triangular frame (triangular hitch) is used for the three-point link of the tractor.
A technique for mounting the working machine by lifting it up while holding the three-point link in a fixed state is disclosed in Japanese Utility Model Application No. 57-133904, Japanese Patent Application No. 61-297375, etc. is proposed.

(Problem to be Solved by the Invention) In the conventional technology, the top link does not extend in conjunction with the mounting operation, so the triangular pitch (coupling body) does not function as a fixed frame. His posture was such that he could not swing back and forth.

Therefore, it is difficult to maintain the posture for scooping up the work equipment, especially at the joints of the work equipment (upper punch joint, lower punch joint, or rear pitch).
When viewed from the side, the upper part is in the front and the lower part is in the rear, making it difficult to connect (attach).

An object of the present invention is to expand and contract the top link in relation to the mounting operation, thereby changing the posture of the connecting body, thereby making the mounting accurate and quick.

(Means for Solving the Problems) The present invention provides a tractor 1 having a three-point link mechanism 9 formed of a top link IO and left and right lower links 11 that can be raised and lowered, an upper punching part 88 and a left and right lower link mechanism 9. In order to achieve the stated purpose, the following technical techniques are used to mount the working machine R having the engaging portions 89 and 89 by scooping up the upper punching portion 88 by raising the three-point linkage mechanism 9. They took measures.

That is, at the end of the three-point linkage mechanism 9 on the working machine R side, there is a scoop-up connecting portion 22 for the upper punching portion 88 and a lower punching portion 8.
A connecting body 14 having lower connecting parts is and is for 9.89 is attached so as to be swingable in the front and rear directions around the lower connecting part 18.18, and the tractor 1 is made to approach the work machine R. When the top link 10 extends, the connecting body 14 is scooped up from the lower connecting part 18.18, and the connecting part 22 is swung to the rear side closer to the working machine R side. It is positioned below the engaging part 88, and from this position, the three-point linkage mechanism 9 is raised to connect the scooping connection part 22 to the upper punching part 88, and then the three-point linkage mechanism 9 is further raised. By this, while reducing the top link 10, the lower connecting portions 18 and 18 of the connecting body 14 are connected to the lower punching portion 8 of the work machine R around the two engaging portions 88.
It is characterized in that it is installed by advancing towards the direction 9.

(Examples and effects) Embodiments of the present invention will be described in detail below with reference to the drawings.

In Figures 1 and 2, 1 is a tractor, 2 is a l.
The tractor body 3 is a hydraulic device for lifting and lowering a working machine, which is exemplified as a lifting device mounted on the rear part of the tractor body 2, and has a pair of left and right lift arms 4.

5 is a seat, 6 is a rear wheel, 7 is a rear wheel fender, and 8 is a PTO shaft, which protrudes rearward from the rear end of the vehicle body 2.

R is a side drive type rotary tiller exemplified as a working machine, which is connected to the rear of the tractor 1 via a three-point linkage mechanism 9 so as to be movable up and down and detachable.

The three-point linkage mechanism 9 consists of a top link 10 shown as a two-part connecting link in the center and lower links 11 shown as a pair of left and right lower connecting links.
and each lift arm 4 are connected by a lift rod 12, respectively.

The top link 10 is constructed as shown in FIGS. 3 and 4.

That is, 10^ is an inner rod, and has a ball-and-socket type connecting portion 10B at one end. The IOC is an outer rod and has a pole-and-socket type connection NOD at one end.

The inner rod 10A and the outer rod 10C have a nested structure and are expandable and retractable, and the outer rod 10C is provided with a stopper IOE for holding and fixing during expansion and contraction in a direction engaged by a spring IOF. IOC indicates a stopper holder.

A lock hole 1011 is formed in the inner rod 10A, into which a stopper IOE enters during contraction to fix the contracted state. In FIG. 3, when the stopper IOE is pulled out from this lock hole 10■,
The top link 10 is extendable, and at this time, the stopper IOE comes into contact with the recess 10T formed in the inner rod 10A by the biasing force of the spring IOF, and can contract if a force greater than the contact force is applied. There is.

In the example shown in FIG. 4, the stopper IOE is connected to the lock hole 10.
If removed from H, the inner rod 10A has a coil spring 10J to forcibly expand.

As shown in FIGS. 6 to 9, a connecting body 14 connects the working machine side ends, that is, the rear ends of the top link 10 and both lower links 11, and projects upward. A cylindrical main body 15 having a mountain shape when viewed from the front, a pair of left and right side plates IG protruding upward and diagonally backward from the upper end of the center portion of the vehicle body 15 in the left-right direction, and side plates IG extending in the left-right direction at both left and right ends of the main body 15. A pair of left and right cylindrical bodies 17 are arranged, and a pair of left and right connecting shaft bodies 18 that protrude outward from the outer end of each cylindrical body 17 and have a smaller diameter than the cylindrical body 17 are provided.

A ball joint portion 20 at the rear end of the top link 10 is removably connected between the front portions of the left and right side plates 16 by a mounting pin 21 . A notch 22 that opens diagonally upward and rearward is formed at the rear of both side plates 16, and the upper part of the notch 22 gradually widens toward the upper end.

A hollow circular i (i trapezoidal) side guide body 23 is fitted and fixed onto the outer end of each cylinder 17 with the small diameter end face facing outward.

A circumferential groove 24 is formed in the inner side of each connecting shaft body 18, and a ball joint part 25 of each lower link 11 is removably fitted onto each side thereof, and is prevented from coming out by a pin 26.

The work machine R includes an input case leaf 6 located at the center of the upper front portion in the left-right direction, and a top mast 7 that projects obliquely forward and upward from the input case leaf G and includes a pair of left and right side plates 77.
8, a pair of support arms 79 protruding from the input case shelf 6 on both left and right sides, a pair of left and right brackets 80 protruding forward from the middle part of each support arm 79 in the left and right direction, and each of the top masts 78. A pair of left and right support links 81 connecting the upper end of the side plate 77 and the front end of each bracket 80, a transmission case 82 and a side plate, which are lowered from each outer end of each support arm 79, and a transmission case 82 and a side plate. It is horizontally suspended between the lower ends of the side plates and is driven to rotate, and has a tilling shaft and a number of wheels provided thereon.
The tilling section 83 includes a tilling section 83, a tilling cover 84 that covers the tilling section 83, a pair of left and right gauge wheels 85, and a tilling depth adjustment mechanism 86 that raises and lowers these gauge wheels 85.

An input shaft 29 protruding forward is rotatably supported in the input case shelf 6 by a bearing.

The input shaft 29 is interlocked with the PTO shaft 8 of the tractor 1 via a transmission shaft 44, and at this time, the transmission shaft 44 and the input shaft 29 are detachably connected via a clutch device 28.

As shown in FIG. 8, between the upper ends of both side plates 77 of the top mast 78, an upper punch engaging part 88, exemplified by a bottle, is provided in the left-right direction, and the connecting body I4 is connected to this upper engaging part 88. Notch 2
2 are removably retained from the lower side, that is, they are removably fitted.

As shown in FIGS. 10 and 11, reference numeral 89 denotes a pair of left and right lower punching portions that are approximately U-shaped in side view, and each bracket 8
It is fixedly installed on the front part of 0 in a forward protruding manner.

Each of the connecting shafts 18 of the connecting body 14 is removably engaged in each lower engaging portion 89 from the front side, that is, removably fitted.

As shown in FIGS. 10 to 13, reference numeral 92 denotes a pair of left and right blocking devices, which releasably prevent the connecting shafts 18 from coming off the respective lower punching portions 89. , a retaining pin 94 , a biasing spring 95 , and a regulating body 96 .

The mounting tube 93 is erected on the upper surface of the upper wall portion of the lower punching portion 89 in a forward-inclined posture, and a fixing plate 97 is erected from the rear of the end portion of the outer peripheral surface of the mounting tube 93. A semicircular engagement recess 98 is formed at the upper end of the fixing plate 97 .

The retaining pin 94 is inserted into the mounting cylinder 93 and the lower punching portion 89 so as to be movable in the axial direction of the mounting cylinder 93, that is, in the downward direction of the road. As shown in FIG.
As shown in FIG. The position can be freely changed to a permissible position that allows engagement and disengagement with and from the lower engaging portion 89 of 18.

A downwardly tapered locking receiving surface 99 is formed at the lower end of the outer peripheral surface of the retaining bottle 94, and a U-shaped hook 100 is formed at the upper end of the retaining jar 94. is fixed in an upwardly projecting manner, and as shown by the imaginary line in FIG. The retaining pin 94 is locked in the permissible position.

A spring retainer includes a ring 101 and a retaining ring 1 that holds the ring 101 in the middle of the outer peripheral surface of the retaining pin 94 in the vertical direction.
02, the spring receiver is replaced with a ring 101, the spring receiver on the upper end side of the mounting cylinder 93 is replaced with a ring 103, and the biasing spring 95 wound around the retaining pin 94 is renovated into an elastic shape,
The retaining pin 94 is urged downward, that is, toward the blocking position.

A support shaft 105 projects inward from the lower end of the front portion of each bracket 80, and the lower end of the regulating body 96 is rotatably provided on the support shaft 105.

The regulating body 96 has a notch 107 formed in the upper engaging portion 89.
The -F end of the front end surface is a locking surface 108 that slopes forward downward, and the locking surface 108 of the front end surface
The lower side of is a cam surface 109 that is inclined forward and upward.

The regulating body 96 has its locking surface 10 as shown in FIG.
8 locks the retaining surface 99 of the stopper bottle 94 to releasably hold the stopper bottle 94 in the permissible position, and as shown by the imaginary line in FIG. 10 or 11, It is said that the position can be changed freely to the position where the holding is released.

The tonneau link 10 is pivotally connected to left and right brackets 111 that project rearward from the tractor 1 so as to be able to change its longitudinal position. As shown in FIG. 5, this pivot connection involves positioning a ball joint 112 attached to the front end of the top link 10, that is, a connecting portion 10B, between the left and right brackets 111, and a support shaft 113 that supports this ball joint 112. The mountings formed on the left and right brackets 111 are supported by holes 114.

14 to 17 show a second embodiment of the present invention, which has a triangular hitch frame structure, and parts common to the two embodiments are designated by common reference numerals.

The front hitch (connecting body 14) is framed in a triangular shape when viewed from the front and rear, and includes a top link connecting portion 118 and a lower link connecting portion 119.

The rear hitch 120 is framed in a triangular shape when viewed from the front and back, into which the front hitch 14 can be inserted, and is attached to the working machine R side. is the upper engaging portion 89, and the front hitch 14
When the top of the groove is scooped up into the upper punch fitting part 88 from below and both pitches 14 and 120 are fitted in an overlapping manner, the lock hole 121 provided corresponding to both grooves 14 and 120 is inserted into the upper punch fitting part 88 from below.
It is designed to be fixed by inserting a bolt into it.

Next, the effect will be explained.

Before installation, scoop up the connecting body 14 and attach it to the connecting part 22.
maintain the posture so that it is behind the lower connecting part 18. In other words, the top link 10 is held in an extended state and this posture is maintained.

In this state, the tractor 1 is moved backward, and the scooped-up connecting portion 22 is held in a crowded manner below the upper punching portion 88, as shown in FIGS. 1, 7, and 16.

Thereafter, by raising the three-point linkage mechanism 9 using the hydraulic device 3, the scoop-up connecting part 22 is engaged with the upper engaging part 88, and when the three-point linkage mechanism 9 is further raised, the top link 10 is A compressive force is applied to reduce the size, and as a result, the lower connecting portion 18 around the first engaging portion 88 is compressed to the upper engaging portion 89.
The connecting body 14 is connected to the working machine R.

(Effects of the Invention) The present invention is as follows. The end of the three-point linkage mechanism on the work machine side is provided with a lift connection portion for the upper punch engagement portion and a lower connection portion for the upper engagement portion. , is attached so that it can swing freely in the front and rear directions around the lower connecting part, and when the tractor approaches the work equipment, the connecting body is scooped up from the lower connecting part by the extension of the top link and connected. The part is swung to the rear side near the working machine side, and while this state is maintained, the scooping connection part is positioned below the upper punch joint part, and from this position, the three-point linkage mechanism is raised to engage the upper part. Connect the scooping connection part to the joint part, and then further raise the three-point link mechanism to reduce the top link and connect the lower joint part of the connection body to the upper engagement part of the work machine around the upper punch joint part. Since it is characterized by being installed by advancing toward the work machine side, the -L part of the connecting body, that is, the scooping up position (scooping up position) This allows for proper handling of the situation, allowing for reliable and accurate raising.

Also, after engaging the scooping connection part with the upper punching part,
By further raising the three-point linkage mechanism, the top link can be retracted, thereby also reliably connecting the lower connecting part to the upper engaging part.

[Brief explanation of the drawing]

FIG. 1 to FIG. 13 relate to the first embodiment of the present invention.
The figure is a side view before the tractor and the work machine are connected, Figure 2 is a side view after the same is connected, Figure 3 is a sectional view of the top link, Figure 4 is a sectional view of another example of the same, and Figure 5 6 is a side sectional view of the connecting part between the connecting body and the working machine, FIG. 7 is a side sectional view of the connecting part in the same different state, and FIG. 8 is the connecting body in a different state. 9 is a front sectional view of the connection part between the and the working machine, FIG. 9 is a front sectional view of the same part, FIG. 10 is a side sectional view of the same part, FIG. 11 is a view taken along arrow A in FIG. 11, FIG. 13 is a view taken along arrow B in FIG. 11, FIGS. 14 to 17 show the second embodiment of the present invention, and FIG. 14 is a side view of the connected state. , FIG. 15 is a perspective view of the main part before connection, FIG. 16 is a side view of the main part of the connection method, and FIG. 17 is a sectional view of the main part in the connected state. 1... Tractor, 9... Three-point linkage mechanism, 10...
-Top link, 11...Lower link, 14...Connection body, 18...Lower connection part, 22...Upper connection part, 88
... Upper engaging part, 89... Upper engaging part, R... Working machine.

Claims (1)

[Claims] (1) Tractor 1 having a three-point linkage mechanism 9 formed by a top link 10 and left and right lower links 11 that can be raised and lowered
and a working machine R having an upper engagement part 88 and left and right lower engagement parts 89, 89, in a method of mounting the upper engagement part 88 by lifting up the three-point linkage mechanism 9. At the end of the link mechanism 9 on the work machine R side, a connecting body 14 having a scooping connecting part 22 for the upper engaging part 88 and lower connecting parts 18, 18 for the lower engaging parts 89, 89 is attached as a lower connecting body. The connecting body 14 is attached so as to be swingable in the front and rear directions around the parts 18, 18, and when the tractor 1 approaches the work machine R, the connecting body 14 is scooped up from the lower connecting parts 18, 18 by the extension of the top link 10 and connected. The part 22 is swung to the rear side close to the working machine R side, and this state is maintained to position the scoop-up connecting part 22 below the upper engaging part 88, and from this position, the three-point link mechanism 9 is Raise the upper engaging part 88
By connecting the scooping connection part 22 to the top link 10 and then further raising the three-point link mechanism 9, the top link 10
Attaching a working machine to a tractor is characterized in that the lower connecting parts 18, 18 of the connecting body 14 are advanced toward the lower engaging part 89 of the working machine R around the upper engaging part 88, and are attached. Method.