JPH063884Y2 - Loader Excavator Front pin mounting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a mounting structure for connecting pins of an arm cylinder, a level cylinder and a bucket cylinder in a front of a loader shovel.

(Prior Art) FIG. 2 is a side view showing a front of a conventional loader shovel, 1 is a boom mounted on a main body (not shown) so as to be undulated by a boom cylinder 2, and 3 is an arm. The arm 3 is attached to a bracket 4 having parallel plate-shaped portions provided on the left and right of the tip of the boom 1 so as to be rotated by an arm cylinder 6 around a pin 5. Reference numeral 7 denotes a level cylinder for horizontally pushing out the bucket 8. The bucket 8 has a pin 9 at the tip of the arm 3.
Is attached so as to be rotated by the bucket cylinder 10. One end of the bucket cylinder 10 (the end on the rod side in this example) is attached to the bracket 4 by a pin 11.
Connect by. One end of each of the arm cylinder 6 and the level cylinder 7 is connected to a bracket 12 provided on the boom 1 by pins 13 and 14, respectively, and the other ends of the arm cylinder 6 and the level cylinder 7 are connected to a bracket 15 provided on the arm 3, respectively.
6, 17 are connected.

FIG. 3 shows a pin 5 for connecting the arm 3 to the bracket 4.
4 is a sectional view showing a mounting structure of a pin 11 for connecting one end of the bucket cylinder 10 to the bracket 4 and FIG. 5 is both ends of the arm cylinder 5 and the level cylinder 6. 5 is a diagram showing the pin attachment structure of FIG. 6 as a representative for the rod side pin 16 of the arm cylinder 6, and the attachment structure of the other pins 13, 14, 17 is also the same as in FIG.

The parallel plate-like portions 18 that constitute the bracket 4 shown in FIG.
The space A between the 19 is determined by the width B of the pin attachment portion 20 of the arm 3 which is determined in correspondence with the diameter C of the pin 5 in terms of strength, and the width B and the thickness of the plate-like portions 18 and 19 are determined. The thickness D and the thickness E of the reinforcing seats 21 and 22 fixed thereto are also determined by the strength required to support the load generated by the arm 3 or the bucket 8 and the earth and sand. For example, A
= 167 mm, B = 160 mm, C = 120 mm, D = 25 m
m and E = 28 mm.

A tongue piece 23 as shown in FIG. 6 is fixed to one end of the pin 5 so as to project to the side of the pin, and the tip of the tongue piece 23 is a recess of the receiving metal fitting 24 fixed to the reinforcing seat 22. The pin 5 is fixed to the bracket 24 by the pressing bracket 27 which is fixed to the bracket 24 by the bolt 26 to prevent the pin 5 from rotating with respect to the bracket 4 and prevent the pin 5 from moving in the axial direction. The stopper mechanism 28 is configured. 29 is an oil supply groove and 30 is a bush.

The bucket cylinder 10 connecting pin 11 shown in FIG.
Since the strength of the arm 3 connecting pin 5 is not required,
The width F of the connecting portion 31 is set smaller than the width B of the arm connecting portion shown in FIG. 3 (B> F, for example F = 130 mm), and the diameter G of the pin 11 is set to 110 mm, for example.
However, since the distance A between the parallel plate-shaped portions 18 and 19 is adjusted to the width B of the pin connecting portion 20 of the arm 3 and is too large for the connecting portion 31 of the bucket cylinder 10, the plate-shaped portions 18 and 19 face each other. Reinforcing seats 32, 33 (thickness H =
16 mm) and the mounting width I is set.

On the other hand, as shown in FIG. 5, the bracket 15 to which the arm cylinder 6 is pinned is also formed by the parallel plate portions 34 and 35, and the width F of the connecting portion 36 of the arm cylinder 6 is taken into consideration because of the required strength. , Pin diameter G, plate spacing I
Is also set in the same manner as in the case of FIG. Plate-like parts 34, 35
On the opposite surface of the, the reinforcement seat 3 with thickness J (J = 28 mm)
6 and 37 are fixed to each other, and thus the metal fitting 2 provided for fixing the tongue piece 23 for providing the reinforcing seat 37 is provided.
4A, the height K is larger than the height L of the receiving metal fitting 24 of FIG. 4 (K> L), and the length M of the pin 16 is longer than the length N of the pin 11 shown in FIG. 4 (M > N) are used. The pins 13, 14, 17 have the same size as the pin 16, and the structure of the stopper mechanism 28A, the respective member dimensions thereof, and the distance between the parallel plate portions of the bracket 12 are the same for the pins 13, 14, 16, 17. Is.

(Problems to be Solved by the Invention) As described above, in the conventional pin attachment structure, the bucket cylinder 10, the arm cylinder 6 and the level cylinder 7 have the same connecting pin diameter (G). ,
Due to the difference in the distances A and I between the parallel plate portions, different lengths M and N
And the reinforcing seats 32, 33 and 3 are used.
Due to the difference in the mounting positions of 6, 37, the stopper mechanism 28,
The heights L and K of the 28A receiving brackets 24 and 24A are also different.
Therefore, there are many types of pins and types of stoppers, which is disadvantageous in terms of manufacturing and management.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a bracket having parallel plate-shaped portions on the left and right of the tip of the boom, and attaches an arm pin to the parallel plate-shaped portions. And a bucket cylinder pin attachment portion, and a bracket having parallel plate-shaped portions for pinning both ends of the arm cylinder and the level cylinder is provided on the arm and the boom, and the plate-shaped portions of the parallel plate-shaped portion are opposed to each other. In a loader shovel front in which a reinforcing seat is provided on a surface and a stopper mechanism is provided between an end portion of the pin and the plate-shaped portion, one plate-shaped portion of the bucket cylinder pin attachment portion in the bracket at the boom tip end portion A first reinforcing seat having substantially the same thickness as the reinforcing seat provided on the pin attachment portion of the arm cylinder and the level cylinder is provided on the surface opposite to the other plate-shaped portion of A second reinforcing seat is provided on a surface of one plate-shaped portion facing the one plate-shaped portion, and the arm cylinder and the level cylinder are connected to a pin attachment portion provided with the first and second reinforcing seats. A pin having the same length and diameter as the work pin is inserted and attached, and a stopper mechanism is provided between the first reinforcing seat side end of the pin and the one plate-shaped part.

(Embodiment) FIG. 1 is an embodiment of a pin mounting structure according to the present invention, in which the pin 11 (the pin according to the present invention is designated by 11A) is mounted on the bracket 4 of the bucket cylinder 10 shown in FIG. Is shown. In the present invention, the mounting structure by the pin 5 of the arm 3, the pins 13, 14, 16, of the arm cylinder 6 and the level cylinder 7,
The mounting structure of 17 is as shown in FIGS. 3 and 5, respectively.

As shown in FIG. 1, the arm cylinder 6 and the arm cylinder 6 are provided on the surface of the parallel plate-shaped portion of the bracket 4 provided at the tip of the boom 1 opposite to the plate-shaped portion 19 of the other plate-shaped portion 18. Reinforcement seat 36 provided at the pin attachment portion of the level cylinder 7,
The first reinforcing seat 37 having substantially the same thickness J as 37 is provided by welding or the like, and the one plate-shaped portion 1 of the other plate-shaped portion 19 is provided.
8 and the pin connecting portion 3 between the plate-like portion 18 and
A reinforcing seat (thickness P = 32 mm in the above example) is fixed by welding or the like in order to form the space I necessary for inserting 1.

In this way, the same length M and diameter G as those of the arm cylinder 6 and level cylinder 7 connecting pins 13, 14, 16 and 17 are provided at the pin attachment portions provided with the first and second reinforcing seats 38 and 39. The pin 11A is inserted and attached, and the pin 1A shown in FIG. 5 is attached to the first reinforcing seat 38 side of the pin 11A.
A stopper mechanism 28A similar to 3, 14, 16, 17 is provided. The height of the receiving metal fitting 24A constituting the stopper mechanism 28A is K as in the case of FIG. That is, in the structure of FIG. 1, since the thickness of the reinforcing seat 38 is the same (J) as the thickness of the reinforcing seat 37 of FIG. 5, it has the same size as that shown in FIG. Is used.

The thickness of the first reinforcing seat 38 is the same as that of the reinforcing seat 3 of FIG.
7, the second reinforcing seat 39 is fixed to the plate-like portion 19, and the distance I is equal to the thickness (J) of the reinforcing seat 3.
By being formed between 9 and the plate-like portion 18, the oil supply hole 40 to the oil supply groove 29 can be set at the center of the pin connecting portion 31 in the width direction.

(Effect of the Invention) According to the present invention, a pin having the same length and diameter as the end connecting pin of the arm cylinder and the level cylinder can be used as the pin connecting one end of the bucket cylinder, and the stopper mechanism is also provided. Since the same ones as those used for the arm cylinder and the level cylinder connecting pin can be used, they are advantageous in manufacturing and management and are advantageous in cost reduction. Further, since the oil supply hole is set at the center of the pin connecting portion of the bucket cylinder, the lubricating oil can be uniformly supplied to the pin sliding surface.

[Brief description of drawings]

FIG. 1 is a sectional view showing an outline of an embodiment of a pin mounting structure of a loader front according to the present invention, FIG. 2 is a side view showing an example of the loader front, and FIG. 3 shows an arm connecting portion in the loader front. Sectional drawing, FIG. 4 is a plan view showing a pin connecting structure at the end of a conventional bucket cylinder, FIG. 5 is a sectional view showing a pin connecting structure at the end of an arm cylinder and a level cylinder, and FIG. It is a front view showing a stopper mechanism.

Claims (1)

[Scope of utility model registration request] 1. A bracket having parallel plate-shaped portions is provided on the left and right of the tip of the boom, and the parallel plate-shaped portion is provided with an arm pin attachment portion and a bucket cylinder pin attachment portion. And a bracket having parallel plate-shaped portions to which both ends of the level cylinder are pinned, a reinforcing seat is provided on an opposite surface of each plate-shaped portion of the parallel plate-shaped portions, and the end portion of the pin and the plate-shaped portion are provided. In the front of the loader shovel having a stopper mechanism provided between the arm cylinder and the level, the bucket cylinder pin attachment portion of the bracket of the boom tip portion is provided on the surface of the plate cylinder portion opposite to the other plate portion. A first reinforcing seat having substantially the same thickness as the reinforcing seat provided on the pin attachment portion of the cylinder is provided, and a second reinforcing seat is provided on a surface of the other plate-shaped portion facing the one plate-shaped portion. And a pin having the same length and diameter as the arm cylinder and level cylinder connecting pin is inserted into the pin attachment portion provided with the first and second reinforcing seats, and the first reinforcing member of the pin is provided. A pin mounting structure for a loader excavator front, characterized in that a stopper mechanism is provided between the seat-side end portion and the one plate-shaped portion.