JPS6014325Y2 - Top link hinge stopper device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stopper device for fixing a draft control top link hinge of an agricultural tractor.

This type of draft control is used to maintain a constant plowing depth using working machines that require draft control, such as plows.The top link hinge is suspended from a holder on the machine side via a pin in the width direction of the machine. It is connected to the plow via the top link and top mast, and to the control valve that controls the lifting and lowering of the lift arm via a feedback rod.

As the plowing depth increases and the traction force (draft) on the plow increases, the top link hinge is moved forward via the top mast and top link, and this movement is transmitted to the control valve via the feedback rod, causing the control valve to lift. It operates in the direction of raising the arm, and the lift arm raises the plow slightly, reducing the plowing depth.

Each part of the draft control mechanism is designed to always work together, so when a work machine that does not require draft control, such as a rotary or a trailer, is installed in place of the plow, each part moves unnecessarily, causing wear and tear. There was a problem that it could cause problems.

The present invention uses a stopper to prevent forward movement of the top link hinge and lock the draft control mechanism, which will be explained below with reference to the drawings.

In Fig. 1, a top link hinge 4 is suspended from a holder 2 using the rear cover of the hydraulic case 1 for lifting the lift arm via a pin 3 in the vehicle width direction (direction perpendicular to the plane of the paper in Fig. 1). A sensor spring 5 made of a plate spring having a generally U-shaped cross section is arranged between the top link hinges 4, and the front upper end is fastened to the holder 2 with a bolt 6, and the rear upper end is fastened to the top link hinge 4 with a bolt 7. A sensor spring 5 is inserted into a hole 9' provided at the lower end of the top link hinge 4 facing in the front-rear direction (left-right direction in FIG. 1). Pass the set position adjustment bolt 9 from the rear and insert its front end into the holder 2.
It is screwed into a screw hole (not shown) and locked with a cylindrical nut 12 via a spring washer 11.

The lower end of the feedback rod 14, which is connected to a control valve (not shown), is connected to the lower end of the top link hinge 4 via a pin 25.

A plow, rotary, trailer, etc. (not shown) is attached to the rear and lower position of the top link hinge 4 (lower right side in Fig. 1) with a three-point link hitch, and the top mast,
It is connected to the top link hinge 4 via a top link (both not shown).

15 is a hole for connecting the top link.

Screw hole 1 provided on the left side of holder 2 as shown in Figure 2
A stud bolt 17 is screwed into 6 and rotatably supports a stopper 18 at its outer end.

19 is an E-shaped retaining ring, and 20 is a spring washer.

As shown in FIG. 1, the stopper 18 has an elongated plate shape, and has a hole at one end for fitting the stud bolt 17 and a notch 21 at the other end. A notch 21 fits into a pin 22 protruding from the left side surface from above.

A plate spring, which is an example of a fixing mechanism, is fastened to a portion of the holder 2 above the stud bolt 17 with a bolt 24.

The leaf spring 23 is bent outward from the front end with its surface vertical;
It is further bent backwards into an S shape (Fig. 1a).

When the stopper 18 is erected, the side surface is pressed by the S-shaped portion of the leaf spring, and the stopper 18 is fixed in an upright position (unlocked position).

26 is a positioning pin. When working with a plow, etc.
When it is necessary to perform draft control, the stopper 18 is removed from the pin 22 of the top link hinge 4 and fixed with the leaf spring 23, so that the top link hinge 4 can move according to the plowing depth (traction force on the plow), and the draft control is performed. Make each part of the mechanism operational.

Stopper 1 is used when draft control is not required, such as when working with a rotary or towing a trailer.
8, the pin 22 is fitted into the notch 21, and the top link hinge 4 is fixed so that it cannot move back and forth.

As a result, even if the traction force on the rotary or trailer changes, each part of the draft control mechanism, including the top link hinge 4, does not move.

As explained above, according to the present invention, by fixing the top link hinge 4 with the stopper 18, when using a working machine that does not require draft control, each part of the draft control mechanism can be locked, causing unnecessary movement and wear of each part. You can prevent this from happening or causing a malfunction.

Furthermore, when using a work machine that requires draft control, the draft control mechanism can be activated by simply fixing the stopper 18 with the leaf spring 23.

Furthermore, in the present invention, a stopper 18 for stopping the draft control is provided to prevent the forward movement of the top link hinge 4 provided between the main machine of the agricultural tractor and the working machine.
One end is rotatably attached to the holder 2 or top link hinge 4 on the side of the tractor main unit via a fulcrum in the left and right direction, and the other end of the stopper 18 is attached to the holder 2 or the top link hinge 4 on the side where the fulcrum is not provided. A notch 21 is formed that engages with a pin 22 parallel to the fulcrum provided on the link hinge 4, and when the stopper 18 is rotated to the non-locking position, the stopper 18 is brought into the non-locking position by its own elastic force. Since the plate spring 23 to be fixed is provided on the holder 2 or the top link hinge 4 on the side where the fulcrum is provided, the top link hinge 4
Even if either a tensile force or a pressing force is applied to the top link hinge 4 from the top link fitted in the top link connection hole 15 of the top link, the notch 21 of the stopper 18 engages with the pin 22 and the top link hinge 4 rotation can be prevented.

To hold the stopper 18 in the unlocked position, simply rotate the stopper 18 as shown by the two-dot chain line in the figure and use the elastic force of the leaf spring 23 to hold the stopper 18. can do.

The stopper 18 has a simple structure and is inexpensive, and the leaf spring 23
It can be fixed in the non-locking position with one touch, and can be released from this position with one touch as well.

FIG. 3 shows a modification, in which a stopper 1 is attached to the lower right side of the holder 2 via a stud bolt (not shown).
8a so that the notch 21a fits into the left-right pin 25 that connects the top link hinge 4 and the feedback rod 14, and the first and second A leaf spring 23a having the same shape as the leaf spring 23 shown in the figure is fixed so that the stopper 18a which is raised up and in an unlocked position can be fixed.

This modification also provides the same effects as the embodiments shown in FIGS. 1 and 2, and since the connecting pin 25 can be used, the structure can be made simple and inexpensive.

It is also possible to cut and raise a part of the top link hinge 4 with a press to form a protrusion so that the stopper 18 can fit into the protrusion.

The stopper 18 is made into a shape that only prevents the forward movement of the top link hinge 4 by cutting off the melon part on the distal end side (the part indicated by the two-dot chain line P in FIG. 1) from the notch 21 of the stopper 18. It is also possible to prevent the rearward movement of the top link hinge 4 by the head of the set position adjustment bolt 9.

It is also possible to fix the stopper 18 by fixing a leaf spring having an S-shaped section to the stopper 18 so that the S-shaped section is sandwiched between the stopper 18 and the holder when the spring is in the unlocked position.

One end of the tension spring g is fixed to a portion e of the hydraulic case 1 in front and lower than the stud bolt 17, and the other end is fixed to a part of the stopper 18, for example, on the center line of the side surface, so that the stopper 18 can be held in the spring force locking position and in the non-locking position. It can also be fixed in a locked position.

The stopper 18 can also be secured in the unlocked position by a magnet.

A stud bolt is attached to the side of the top link hinge 4, and the bolt supports the stopper so that it can rotate freely, so that the stopper is in a position opposite to that shown in Fig. 1).
It is also possible to attach a pin to the side surface of the holder 2, and when the stopper is tilted forward (towards the holder 2) from the top link hinge 4 side, the notch fits into the pin from above.

[Brief explanation of drawings]

Fig. 1 is a left side view of a top link hinge that adopts the present invention, Fig. 1a is a view 1a-1a of Fig. 1, and Fig. 2 is a rear view with the left end of the holder and the stopper partially cut away. 1) and FIG. 3 are plan views showing modified examples. 2... Holder, 4... Top link hinge, 17... Stud bolt (fulcrum), 18
．． 18a... Stopper, 23, 23a...
...Plate spring (stopper fixing mechanism), g...
-Tension spring (stopper fixing mechanism).

Claims (1)

[Scope of utility model registration request] One end of the stopper 18 for stopping the draft control, which prevents the forward movement of the top link hinge 4 provided between the agricultural tractor main machine and the working machine, is attached to the holder on the tractor main machine side via a fulcrum in the left and right direction. A pin 22 is rotatably attached to the holder 2 or the top link hinge 4 and is parallel to the fulcrum provided on the holder 2 or the top link hinge 4 on the other end of the stopper 18 where the fulcrum is not provided.
A leaf spring 23 is formed on the side where the airway is provided, and a leaf spring 23 that fixes the stopper 18 in the non-locking position by its own elastic force when the stopper 18 is rotated to the non-locking position is formed. A stopper device for a top link hinge, characterized in that it is provided on a holder 2 or a top link hinge 4.