JPH0750883Y2 - Lower link pin support structure - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arrangement of lower link pins for pivotally supporting front ends of left and right lower links in a three-point link type working machine mounting mechanism of a tractor.

[0002]

2. Description of the Related Art Although a lower link pin is also provided in a conventional tractor, conventionally, one left and one lower link pin are projected on the outer surface of the rear axle housing in a cantilevered state. . In addition, the hinge pin that pivotally supports the check chain hinge also protrudes inward from the rear axle case or rear axle housing, and a total of four left and right lower link pins and the check chain hinge pin were arranged separately. .

[0003]

[Problems to be Solved by the Invention] As described above, the present invention is
We improved the point that two lower link pins and two check chain hinge pins were arranged in a cantilevered state, and one lower link pin 5 was used for the rear axle housing and rear axle case. By inserting it through, it also serves as four pins. Further, a final gear is arranged in a portion where the lower link pin passes through the inside of the rear axle housing, and interference between the final gear and the lower link pin poses a problem. By providing a notch in a part, the lower link pin and the final gear are arranged at the frontmost position in a state where they do not interfere with each other. Further, in the past, when fixing the rear axle housing and the rear axle case, two or more knock pins on the left and right sides were inserted for positioning, but in the present invention, the rear axle case and the rear axle housing are penetrated. Since a large diameter lower link pin is inserted, the lower link pin also serves as a knock pin.

[0004]

The problems to be solved by the present invention are as described above. Next, the means for solving the problems will be described. That is, the left and right side wall portions 12a, 12a of the rear axle case 12 are projected rearward to form a recess space A in which the check chain hinges 9L, 9R are arranged, and the rear axle is formed on the outer surface of the left and right side wall portions 12a, 12a. In the configuration in which the housings 6L and 6R are fixedly provided and the final gears 11L and 11R are arranged inside, the left and right rear axle housings 6L and 6R and the left and right side wall portions 12a
12a and one lower link pin 5 penetrating the recessed space A are inserted, and the lower link pin 5 is inserted into the final gear 11 inside the rear axle housings 6L and 6R.
Notches 5c and 5c are provided at positions facing L and 11R.

[0005]

Since the present invention is constructed as described above, it operates as follows. That is, in the past, four lower link pins, two on the left and right, and two check chain hinge pins on the left and right, a total of four cantilevered pins, were inserted and supported, but in the case of the present invention, One lower link pin 5 can replace all the pins. Further, since the lower link pin is provided with a notch in a position facing the final gear inside the rear axle housing, the lower link pin can be arranged forward to a position where it barely interferes with the final gear. Therefore, the length of the rear axle case and the rear axle housing can be shortened.

[0006]

Embodiments of the present invention will be described. 1 is a partial cross-sectional plan view showing a lower link pin support structure of the present invention, FIG.
Similarly, FIG. 3 is a partial side sectional view, and FIG. 3 is an enlarged side sectional view showing a facing position of the lower link pin 5 and the final gear 11. In FIG. 1, the rear axle case 12 is arranged at the center, and from the engine, the clutch housing, and the transmission case arranged at the position in front of the tractor,
The rotation after the shift is transmitted to the inside of the rear axle case 12. A differential gear device is arranged inside the rear axle case 12, and the rotation of the shaft in the front-rear direction is converted into the rotation of the shaft in the left-right direction, and finally the rotation of the axles 13L and 13R is replaced by the wheel. introduce. The rear axle case 12
The left and right side wall portions of the rear portion are defined as left and right side wall portions 12a and 12a, projecting rearward, and forming a recess space A therebetween, and the check chain hinges 9L and 9R are provided inside the recess space A.
Or the top link hinges above the check chain hinges 9L and 9R can be arranged.

Rear axle housings 6L and 6R are attached to the side surfaces of the rear axle case 12 projecting the left and right side wall portions 12a and 12a, and a final gear case is provided between the rear axle case 12 and the rear axle housings 6L and 6R. Is configured. The final gears 11L and 11R are arranged inside the final gear case. Since the final gears 11L and 11R have a large diameter, they project to the lateral positions of the left and right side wall portions 12a and 12a. Then, when the rear axle housings 6L and 6R are fixedly mounted on the left and right side wall portions of the rear axle case 12, if only the bolts are fixed, the axles 13L and 13R are fixed.
When a large load is applied to R, the bolt hole becomes stupid and the bolt is sheared. In order to prevent this, a plurality of knock pins 14 are inserted, but the axle 1
The problem is that the knock pin hole gradually expands when a large load is applied to the 3L and 13R.

The present invention replaces the knock pin 14 with
One lower link pin 5 also serves as a knock pin 1
The number of 4 was reduced to only one in the front. And the lower link pin 5 is attached to the rear axle housing 6L, 6R
2 and the rear axle case 12 are provided with fitting holes 14L and 14R, which are arranged in a straight line, and the lower link pin 5 is inserted therethrough.
The left and right check chain hinges 9L and 9R are loosely fitted to the portion where the lower link pin 5 passes through the recessed space A. Further, the portions of the lower link pins 5 protruding from the outer side surfaces of the left and right rear axle housings 6L and 6R are referred to as lower link loose fitting portions 5b and 5b. Further, the lower link pin 5 is provided inside the rear axle housings 6L and 6R with cutout portions 5c and 5c at positions facing the final gears 11L and 11R, and as shown in FIG.
A space a is formed between the outer circumference of 1L and 11R and the rotation locus of the outer circumference so that they do not interfere with each other.

When the positions of the cutouts 5c and 5c are changed by the rotation of the lower link pin 5, they interfere with the final gears 11L and 11R.
The detent structure of No. 1 is constituted by the positioning bracket 1. As shown in FIG. 2, the positioning bracket 1 is provided with a crescent-shaped moon-shaped engaging hole 2, and the lower link loosely fitting portions 5b and 5b of the lower link pin 5 are fitted in the hole. At the base of the rotation prevention notch 5a
Is provided. The position of the lower link pin 5 is also determined because the position of the upper string lunar engagement hole 2 is determined by fitting the detent notches 5a, 5a into the lunar engagement hole 2 of the upper chord. Is done. Positioning the moon-shaped engaging hole 2 of the upper chord, and aligning the bolt holes 3/8 of the moon-shaped engaging hole 2 of the upper chord with the bolt holes 8/8 provided in the rear axle housings 6L and 6R, Determined by fixing with bolts. The positioning bracket 1 is fixed to a lower position on the outer side of the rear axle housings 6L and 6R, and the lower link pin 5 is positioned in the left-right direction with respect to the detent notches 5a and 5a.

[0010]

Since the present invention is constructed as described above, it has the following effects. That is, firstly, since one lower link pin 5 can serve as all the pins without supporting the lower link pin and the check chain hinge pin on the left and right as in the conventional case, Rear axle housings 6L and 6R and rear axle case 1 to support the holding pin with sufficient strength
The thickness and material of 2 are no longer required. Second
In addition, since the lower link pin 5 is a large-diameter pin that penetrates the rear axle case 12 and the rear axle housings 6L and 6R, the knock pin 14 can be used in place of it, so that the number of knock pins 14 can be reduced. I was able to do it. Thirdly, the lower link pin 5 has notches 5c and 5c.
Since the lower link pin 5 and the final gear 11 are provided
L and 11R can be placed close to each other, and rear axle case 12 and rear axle housing 6L and
The length of 6R could be shortened.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional plan view of a lower link pin support structure of the present invention.

FIG. 2 is a partial side sectional view of the same.

[Fig. 3] Final gears 11L and 11R and notch 5c
5c is an enlarged side sectional view of a portion 5c. FIG.

[Explanation of symbols]

 1 Positioning Bracket 5 Lower Link Pin 5c Notch 6 Rear Axle Housing 11 Final Gear 12 Rear Axle Case

Claims (1)

[Scope of utility model registration request] 1. Left and right side wall portions 12 of a rear axle case 12.
a. 12a is projected rearward to form a recessed space A in which the check chain hinges 9L and 9R are arranged, and rear axle housings 6L and 6R are fixedly provided on the outer surfaces of the left and right side wall portions 12a and 12a. To final gear 1
In the configuration in which 1L and 11R are arranged, the left and right rear axle housings 6L and 6R and the left and right side wall portions 12a and 12a
And one lower link pin 5 penetrating the recessed space A and the lower link pin 5 is inserted inside the rear axle housings 6L and 6R.
A support structure for a lower link pin, characterized in that cutouts 5c and 5c are provided at positions facing 1R.