JPS6015733Y2 - Connecting pin for endless track belt - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a connecting pin used in a track belt that constitutes the undercarriage of tracked vehicles such as power shovels and bulldozers.

A conventional endless track belt of this type is shown in the perspective view of Fig. 1 and the perspective view of Fig. 2.
As shown in the partial plan view of the figure, the upper ends of a pair of links 11 are arranged in a V-shape such that the upper end forms a relatively narrow insertion end and the lower end forms a relatively wide outer insertion end. A shoe plate 4 is fixed to a trapezoidal member fixed via a connecting bush 2 to form a unit track plate, and the inner and outer ends of this unit track plate are connected to the outer ends of adjacent unit track plates, respectively. and the inner insertion end, and are pivotally connected to each other in a chain shape by connecting pins 3, 3, and 5 prevents muddy water from entering between the connecting pin 3 and the bushing 2. This is a sticker for.

In order to reduce wear between the connecting pin and the connecting bush of such a track belt, conventionally the sliding surfaces of the connecting pin and the connecting bush are coated with grease during assembly, but grease is applied during assembly and overhaul. Since applying grease does not provide sufficient lubrication, such track belts inevitably suffer from wear and noise, resulting in considerable power loss.

However, the following problems arise when it comes to lubrication between the connecting pin and the connecting bush.

In other words, (1) A sealing mechanism is required to prevent lubricating oil from leaking to the outside from the sliding surfaces of the connecting pin and connecting bush and between the links, and to prevent muddy water from entering between the connecting pin and the connecting bush. be.

(2) A lubricating mechanism that is low in cost and easy to maintain is required.

The present invention was proposed in view of the above circumstances, and aims to provide a connecting pin for a track belt that is simple in structure, inexpensive, and easy to maintain by satisfying the above two conditions.

An embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a longitudinal sectional view thereof, FIG. 4 is a partially enlarged view of FIG. 3 during refueling, and FIG. 5 is a partially enlarged view after refueling.

In the figure, 1 and 1 are links, 2 is a connecting bushing fixed to the inserted ends of adjacent links 1 and 1, and 3 is a connecting bushing 2 that has both ends fitted to the links 1 and 1, respectively, and a center part that is attached to the connecting bushing 2. Connecting pins 5, 5, which pivotally connect adjacent links to each other by being loosely inserted, each surround the connecting pin 3 and are interposed between the link 1 and the connecting bush 2, so that external muddy water flows between the connecting bush 2 and the connecting pin. a seal for preventing lubricating oil from entering the sliding surface S of No. 3 and leaking outside from the sliding surface S;
Numeral 6 consists of a hole drilled in the axial direction from the shaft end of the connecting pin 3 and a hole bored in the center part in the radial direction and communicating with the hole, which lubricates the sliding surface S of the connecting pin 3. An L-shaped oil supply hole for sealing oil; 7 is an annular groove carved near the opening end of the oil supply hole 6; 8 is an O-ring made of an elastic material such as rubber fitted into the annular groove 7; The outer diameter of the O-ring 8 is larger than the inner diameter of the annular groove 7.

Reference numeral 9 denotes a resin plug that is inserted into the open end of the oil supply hole 6 and works with the O-ring 8 to close the open end of the oil supply hole 6 in an oil-tight manner. Part 1
0, two first and second fitting grooves 11 and 12,
Fitting portions 13 that are connected to the second fitting grooves 12 and fit into the oil supply holes 6 are formed, respectively.

Reference numeral 14 includes a hole drilled in the axial direction from one end of the plug 9 that is open to the outside, and a plurality of holes 14b that are drilled radially in the radial direction between the two fitting grooves 11 and 12 and communicate with the hole. This is a refueling route.

According to the lubricating means for the track connecting portion having such a structure, first the O-ring 8 is fitted into the annular groove 7 of the oil supply hole 6, and when the tapered portion 10 of the plug 9 is inserted into the O-ring 8, the O-ring 8 The plug 9 enters the oil supply hole 6 by expanding the
so that the O-ring 8 is positioned in the second fitting groove 12 of
The second fitting groove 12 is pressed against the inner periphery of the O-ring 8, forming sealing surfaces S□, S2 (FIG. 4).

At this time, inject lubricating oil from the oil supply path 14a of the plug 9,
The oil is filled into the oil supply hole 6 through the oil supply passages 14a and 14b.

Note that since the second fitting groove 12 is press-fitted to the O-ring 8, lubricating oil does not leak to the outside.

After filling the lubricating oil (after refueling), pull the plug 9 so that the O-ring 8 is positioned in the first fitting groove 11 of the plug 9 (FIG. 5), and the sealing surface S1. In the form of S3, the oil supply hole 6 is oil-tightly sealed by an O-ring 8 and a plug 9.

When refueling, it is sufficient to simply move the plug 9 in the same manner as described above.

According to this embodiment, by fitting the O-ring 8 into the annular groove 7 and inserting the plug 9, the first and second fitting grooves 11 and 12 of the plug 9 and the O-ring 8 can easily seal. Since the taper portion 10 is provided on the plug 9, the insertion can be performed without applying excessive force.

In addition, by providing the plug 9 with an oil supply path 14b that is open between the first and second fittings 12 and 12 and communicates with the oil supply path 14a of the plug 9, filling of lubricating oil can be done by simply moving the plug 9 without removing it. You can do it with

As described above, according to the present invention, it is possible to obtain a connecting pin that is simple in structure, easy to maintain, and durable, and in which the function of an oil supply seal can be performed only by moving the plug.

[Brief explanation of drawings]

Figure 1 is a perspective view of the main parts of a conventional endless track belt, and Figure 2 is a perspective view of the main parts of a conventional endless track belt.
3 is a vertical sectional view showing an embodiment of the present invention, FIG. 4 is a partially enlarged view of FIG. 3 during refueling, and FIG. 5 is a portion of FIG. 3 after refueling. It is an enlarged view. 1...Link, 2...Butshu, 3.
...Connecting pin, 4...Shoe plate,
5... Seal, 6... Oil supply hole, 7...
...Annular groove, buttock...01Jng, 9...
...Plug, 10... Taper part, 11...
...First fitting groove, 12...Second fitting groove, 14a
, 14b... Oil supply path (hole).

Claims (1)

[Scope of utility model registration request] One end opens to the outside and the other end opens to the sliding surface,
An oil supply hole filled with lubricating oil is formed in the pin, an annular groove is formed near the external opening end of the oil supply hole, an 01J ring is fitted into the annular groove, and a tapered part is formed at the tip; Two fitting grooves are formed in connection with the tapered portion, and
A plug with an oil supply path opened between the two fitting grooves and the other end opened to the outside is fitted into the inner circumference of the O-ring, and the plug is moved during and after oiling, and the O-ring A connecting pin for a continuous track belt, characterized in that the connecting pin is configured to change the position of the fitting groove.