JPH0134001B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention provides the following features: when a working machine attached to a three-point link type working machine mounting device at the rear of an agricultural tractor is lifted to a non-working state, This invention relates to a work machine steady rest device for eliminating the margin for swing of the work machine to the left and right.

(b) Prior Art Conventionally, as a technique for changing the center of rotation of a check chain, a technique such as that disclosed in Japanese Unexamined Utility Model Publication No. 127610/1983 is known.

Further, regarding a steady rest device in which the pivot axis of the lower link and the center axis of rotation of the check chain are shifted in side view so as to be tightened when ascending, please refer to Japanese Utility Model Publication No. 47-27361 and the actual Kosho 54-
A technique such as that described in Publication No. 19207 is disclosed.

(C) Problems to be Solved by the Invention However, in the prior art, Japanese Utility Model Application Publication No. 57-127610, a stopper is provided to prevent the check chain from rapidly rotating when the lower link rotates upward. Although it was designed to be tight, there was no stopper in case the lower link went down too far, and the work equipment continued to swing from side to side.

In addition, since the check chain bracket is composed of upper and lower plates, and pin holes are opened vertically in the upper and lower plates, it is possible to change the tight position depending on the vertical position of the work machine. It was not possible to change the tight position when the width was changed.

The present invention improves this point.

(d) Means for Solving the Problems The objects of the present invention are as described above, and the configuration for achieving the objects will now be explained.

In the three-point link type work equipment mounting device, the front ends of the lower links 2L and 2R are pivotally supported on a pivot shaft 9, and a stopper 16 is provided on a horizontal support plate 10 that projects rearward from the pivot shaft 9. The front end of the rotating bracket 6 is pivoted to a pivot pin 8 provided on the stopper 16, and the tip of the check chain 5 is pivoted to a check chain bracket 15 that is pivoted to the rear end of the rotating bracket 6 by a horizontal rod 11. The rear end of the support and check chain 5 is pivotally supported in the middle of the lower links 2L and 2R, and is supported by a stop pin 7 provided on the rotation bracket 6.
is brought into contact with the stopper 16 in the upper part, and engaged with the horizontal support plate 10 in the lower part, so that the stop pin 7 contacts the stopper 16 from the position 2b of the lower link 2 where the stop pin 7 contacts the horizontal support plate 10. Up to the 2d position of the lower link 2, the rotational fulcrum of the rotation bracket 6 is the pivot pin 8, and above the 2d position of the lower link 2 and below the 2b position, the rotational fulcrum of the check chain 5 is used. side rod 1
1 position, and insert pin holes 15a and 15 at the tip of the check chain 5 into the check chain bracket 15.
A plurality of holes are provided at the left and right positions, and the hole b can be adjusted according to the size of the working machine.

(E) Embodiment The object and structure of the present invention are as described above. Next, the structure of the embodiment shown in the attached drawings will be explained.

FIG. 1 is a side view of the rear of an agricultural tractor, FIG. 2 is a plan view of the rear, and FIG. 3 is a side view of the lower link and check chain showing the main parts of the invention.
FIG. 4 is a plan view showing the pivot portion of the check chain and lower link, and FIG. 5 is a plan view of the check chain bracket.

In FIGS. 1 and 2, a hydraulic case 22 is provided at the upper part of the rear axle case 18, and the lift arm 3 is operated by a hydraulic cylinder in the hydraulic case 22.
Rotate. Further, a top link hitch 23 is fixed to the rear surface of the hydraulic case 22, and the front end of the top link 1 is pivotally supported on the top link hit 23.

Lift links 4L, 4R are pivotally connected to the tips of the lift arms 3L, 3R, and lower links 2L, 2R are pivotally connected to the lower ends of the lift links 4L, 4R.

PTO shaft 2 from the rear of the rear axle case 18
0 is protruded, and the PTO shaft cover 2 is attached to the PTO shaft 20.
1 is coated.

As shown in Figure 2, according to the standards, the lower links 2L and 2
It is determined that the tip of R should be able to swing left and right by a distance S. The value of S is approximately 100 mm.

As shown in FIGS. 4 and 5, the rear end of a check chain 5 is pivotally connected to a midway portion of the lower link 2 by a pin 14 via spacers 13, 13.

The tip of the check chain 5 is connected to the pin holes 15a and 15b of the check chain bracket 15.
It is engaged with either of the pins.

Check chain brackets 15 are fixed to the horizontal rods 11 and are provided on the left and right sides.

The horizontal rod 11 is rotatably connected to the rear end of the rotating bracket 6.

The rotation bracket 6 has its front end base attached to a pivot pin 8.
Agricultural tractor rear axle case 18
A stopper 16 fixed on the horizontal support plate 10 of
is supported by 12 is a reinforcing plate for the horizontal support plate 10 and the stopper 16.

In the present invention, the positions of the pivot pin 8 and the pivot shaft 9 are intentionally shifted from each other in side view so that the structure will be tight when ascending. Furthermore, a stop pin 7 protruding from the pivot bracket 6 is provided to engage with the stopper 16 and the horizontal support plate 10.

The rotating bracket 6 can only be rotated within an angular range until the stop pin 7 comes into contact with the upper surface of the lower horizontal support plate 10 and until it comes into contact with the rear surface of the upper stopper 16.

In FIG. 3, the check chain 5 is gradually pulled downward at the point 2a of the lower link 2, which is the lower limit beyond which the lower link cannot rotate due to the rotation angle of the lift arm 3.

When lower link 2 is in position 2b, rotate bracket 6
This is the lower limit at which the stop pin 7 contacts the upper surface of the horizontal support plate 10 and the rotation bracket 6 cannot rotate any further.

When the lower link 2 is at the 2d position, the rotation stopper 6
This is the upper limit at which the stop pin 7 contacts the rear surface of the stopper 16 and cannot rotate upward any further.

The position 2e of the lower link 2 is the upper limit at which the check chain 5 is fully extended upward and the lower link cannot rotate any further.

The tight state of the check chain is determined when the lower link 2 is in rotational positions 2a, 2b, 2d, and 2e.

First, as the lower link 2 descends from the position 2b to the position 2a during the angle c from the position 2a to the position 2b, the center of rotation of the check chain 5 shifts to the horizontal rod 1.
1, and the rotation center of the lower link 2 is the pivot shaft 9, so the check chain 5 is at its shortest when the lower link 2 comes to the center line of the pivot shaft 9 and the horizontal rod 11 slightly below 2b. The trail becomes gradually longer and the left and right runout margin decreases, but the structure is such that the left and right runout margin of the lower link does not fall below the standard value when the check chain fluctuates between positions 2b and 2a. .

When the lower link 2 is in the range of angle b between positions 2b and 2d, the rotating bracket 6 rotates upward as the lower link 2 rotates, but the center of rotation of the check chain is at the pivot pin 8. Since the center of the lower link 2 is the pivot shaft 9, the check chain is gradually tightened at a slow speed, and the lower link 2 has no room for swing.

Furthermore, within the range of angle a from the position 2d to the position 2e of the lower link 2, the rotation bracket 6
The stop pin 7 hits the stopper 16 and cannot rotate, and the rotation center of the check chain 5 becomes the horizontal rod 11, and the rotation center of the lower link 2 becomes the pivot shaft 9, so the check chain 5 quickly becomes tight. The swing margin of the lower link is rapidly decreasing.

At point 2c, the lower link 2 is horizontal.

(F) Effects of the Invention Since the present invention is configured as described above, it has the following effects.

First, the check chain 5 becomes tight because multiple pin holes 15a and 15b are provided on the left and right sides of the check chain bracket 15 for different types of work or for work machines of different sizes. The position can be changed for each work machine.

That is, in a small-sized work machine, by pivoting the front end of the check chain 5 to the pin hole 15b inside the check chain bracket 15, the work machine becomes tight when the lower link 2 rises to the position 2d. Constructed to prevent lateral shaking,
Further, in a large-sized work machine, by pivoting the front end of the check chain 5 to the outer pin hole 15a, the lower link 2 can be adjusted to be tight starting from the position 2e.

Second, as the lower link 2 descends from the position 2b, the check chain 5 gradually becomes tighter again, so even if the work equipment falls too low, it will not shake abnormally. Since there is no such thing, it does not shake while driving and is safe.

Thirdly, depending on the type of work equipment, the lifting position and angle before lifting it to the non-working state will differ, but work equipment installed in a low position should be installed slowly and completely tightened while rotating and lifting at a large angle. Since the upper limit of the rotation of the lift arm of the work equipment mounted at a high position is determined, we were able to configure it so that it is completely tightened while rotating quickly and at a small angle. Even if the height of the lift changed, the steady rest could be maintained reliably.

[Brief explanation of drawings]

Figure 1 is a side view of the rear of the agricultural tractor;
3 is a side view of the lower link and check chain showing essential parts of the present invention. FIG. 4 is a plan view showing the pivot of the check chain and lower link. FIG. 5 is a plan view of the check chain. FIG. 3 is a plan view of the chain bracket. 2... Lower link, 5... Check chain, 6... Rotating bracket, 7... Stop pin, 10... Horizontal support plate, 16... Stopper.

Claims (1)

[Claims] 1. In a three-point link type work equipment mounting device, the front ends of the lower links 2L and 2R are pivotally supported on a pivot shaft 9, and a stopper 16 is provided on a horizontal support plate 10 that protrudes rearward from the pivot shaft 9. The front end of the rotating bracket 6 is pivotally supported on a pivot pin 8 provided on the stopper 16, and the tip of the check chain 5 is supported on a check chain bracket 15 that is pivotally supported on the rear end of the rotating bracket 6 by a horizontal rod 11. The rear end of the check chain 5 is pivotally supported in the middle of the lower links 2L and 2R, and the stop pin 7 provided on the rotating bracket 6 is brought into contact with a stopper 16 at the top and a horizontal support plate 10 at the bottom. The rotating bracket 6 rotates from the position 2b of the lower link 2 where the stop pin 7 contacts the horizontal support plate 10 to the position 2d of the lower link 2 where the stop pin 7 contacts the stopper 16. The fulcrum is the pivot pin 8, and above the 2d position of the lower link 2 and below the 2b position, the rotation fulcrum of the check chain 5 is the horizontal rod 11 position, and the check chain bracket 15
Pin holes 15a, 1 at the tip of check chain 5
A working machine steady rest device for an agricultural tractor, characterized in that a plurality of holes 5b are provided at left and right positions so that adjustment can be made depending on the size of the working machine.