KR20150099041A - A Pin for the Caterpillar - Google Patents

Abstract

The present invention relates to a pin for an endless track, configured to enhance the durability of an endless track by calculating minimum values of the outer diameter and the inner diameter of a pin for an endless track according to the weight of a tank. The pin for an endless track is inserted into a connector for connecting shoe bodies with each other. When the pin is a solid core pin, it satisfies Do^3 >= E x weight of a car, and when the pin is a hollow pin, it satisfies (Do^4-Di^4)/Do >= E x weight of a car.

Description

A pin for the caterpillar}

The present invention relates to an endless track, and more particularly, to improve endurance of an endless track by calculating a minimum value of an outer diameter and an inner diameter of an endless track according to the weight of a tram.

Generally, a conveying means called an endless track is mounted on a lower portion of a train, which is a device for connecting a plate made of a steel plate in a chain-like manner and driving it by powerfully rotating the plate in a belt-like manner on the front and rear wheels.

The infinite track has a larger ground surface area and greater friction with the ground than ordinary wheels, so it is possible to freely travel in uneven terrain or mud.

By changing the rotational speed of the left and right, the turning direction can be freely changed, the turning radius can be minimized, and if both endless tracks are rotated in opposite directions at the same speed, the center of the vehicle does not move any more .

The endless track is connected to a plurality of shoe bodies by a connector, which will be described with reference to the drawings.

FIG. 1 is a partial perspective view showing a conventional endless track, and FIG. 2 is a side view showing a conventional endless shoe assembly. As shown in the drawing, a shoe assembly 1 includes a plurality of shoe bodies 10, And a connector 20 connected between the shoe bodies 10 so that the shoe bodies 10 are connected to each other.

A pad 12 is provided at the lower portion of the shoe body 10, and a center guide 30 for preventing the endless track from separating is coupled.

The connector 20 is coupled to the pins 22 on both sides to connect the shoe bodies 10 with each other. A bushing 24 is coupled to an outer circumferential surface of the pin 22.

The pin 22 is a major factor for determining the shape of the track depending on its size, and is the factor that determines the life of the track because it receives the greatest load of the train.

Therefore, as the outer diameter of the pin 22 increases, the amount of load received per unit area increases, thereby improving the durability of the track. However, since the weight of the track increases proportionally, There is a problem that the performance is lowered.

However, conventionally, there is no criterion for determining the size of an appropriate pin according to the weight of a train, and thus an optimum pin size can not be provided.

Korean Patent Publication No. 10-2007-67494 (Published on June 28, 2007)

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a standard for providing an appropriate dimension of a pin connected to an endless track according to the weight of a train, The invention provides a track for an endless track that meets the durability of the track but does not overly increase in weight.

According to a first aspect of the present invention, there is provided an endless track pin inserted into a connector for connecting shoe bodies,

The pin for an endless track satisfying the condition of Do ³ ≥E × when the pin is a solid pin, and (Do ⁴ -Di ⁴ ) / Do ≧ E × when the pin is a hollow pin.

Here, E = 0.616.

As described above, according to the present invention, it is possible to satisfy the durability of the tram by presenting the minimum condition of the fins for the track according to the load (load) of the tram, and accordingly, the vehicle is not excessively increased.

1 is a partially separated perspective view schematically showing a conventional infinite orbit.
2 is a side view showing a shoe assembly of a conventional tramless endless track.
3 is a plan view of a shoe assembly connected in one line of the two shoe assemblies of FIG.
FIG. 4 is a graph showing the minimum outer diameter of the pin according to the weight of the vehicle when the pin is a solid pin.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

2 and 3, when a load is transmitted to the pin 22 connecting the shoe bodies 10 constituting the shaper assembly 1 for endless track with the connector 20, 22, a bending stress is generated, and the maximum bending stress is expressed by the following equation.

Although the pin in Fig. 2 is shown as a hollow pin, it may be replaced with a solid pin. The following equations are derived for hollow pins and solid pins.

[Equation 1]

Maximum load per shoe body (10) = A × load

Where A is the coefficient for the load applied to one shoe body when maximum tension is applied to the trajectory.

The maximum bending moment of the pin 22 is given by the following equation (2), assuming that the pin 22 has a uniform load distribution from the shoe body 10.

&Quot; (2) "

Maximum bending moment of the pin = (Load x L) / 12 = ((A x W x L) / 12

Sectional modulus = π × (Do ⁴ -Di ⁴ ) / (32 × Do)

Here, L is the length of the shoe body, Do is the outer diameter of the pin 22, and Di is the inner diameter of the pin.

Maximum bending stress = maximum bending moment / section modulus = B x (load x Do x L) (Do ⁴ -Di ⁴ )

Since B = (A x 32) / (12 x P), the outer diameter (Do) can be summarized as follows.

In the case of a hollow pin, (Do ⁴ -Di ⁴ ) / outer diameter = B x ((load × L) / maximum bending stress)

In the case of a solid pin, Do ³ = B × ((weight of the vehicle × L) / maximum bending stress).

Based on the results of the structural analysis, the test results in the laboratory and the outdoors, the maximum bending stress with minimum durability is assigned to each pin hardness to obtain the minimum value calculation formula of the outer diameter (Do).

(Do ⁴ - D i ⁴ ) / Do ≥ (C × L) / (C × pin hardness + D)

C and D are constants that are generated when the maximum bending stress is applied.

Generally, in an endless track, the length L of the shoe body is 240 mm, and the hardness of the pin 22 is HRC 50 or more.

Substituting this, the following equation for calculating the outer diameter of the pin and the graph shown in FIG. 4 can be derived.

In the case of solid pins, Do ³ ≥E ×

In case of hollow pin (Do ⁴ -Di ⁴ ) / Do ≥E × ×

Here, E = 0.616.

FIG. 4 is a graph showing the minimum pin diameter according to the weight of the vehicle when the pin is a solid pin. In the graph shown in FIG. 4, the X axis represents the vehicle weight (on the road) and the Y axis represents the pin outer diameter.

In Fig. 4, the left area of the curve is an applicable area as a pin, and the right area shows a hardly applicable area.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims and their equivalents. It will be possible. Therefore, the embodiments disclosed in the present invention and the accompanying drawings are intended to illustrate and not limit the technical spirit of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments and the accompanying drawings . The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Do: Outer diameter
Di: inner diameter
L: Shubody Length
1: shoe assembly
10: Shubody
20: Connector
22: pin
24: Bushing

Claims (1)

A pin for an endless track inserted into a connector for connecting shoe bodies,
When the pin is a solid pin, it is in the range of Do ^3? E ×,
In case of a hollow pin (Do ⁴ -Di ⁴ ) / Do ≥E × The pin for an endless track that satisfies the condition of the car.
Here, E = 0.616.

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