JPS6318554Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a crawler linking pin that has an improved pin plug that fits tightly into the end of the pin body.

Generally, crawlers used in tracked vehicles are constructed by connecting a large number of links in an endless manner with connecting pins, and the connecting pins have oil holes a inside, as shown in Figure 1. , this oil hole a is filled with lubricating oil. The lubricating oil sealed in the oil hole a reaches between the pin c and the bush d fitted on the outer circumference of the pin c through the through hole b, and lubricates the frictional part between them. There is. In addition, an inner plug made of a transparent material is press-fitted into the center of the pin plug e that is tightly fitted into the opening of the oil hole a, so that the amount of lubricating oil sealed in the oil hole a can be adjusted without removing the pin plug e. There are some that can be checked, but since the inner plug is provided in the center of the pin plug e made of elastic material such as rubber, when the oil in the oil hole a becomes low, the amount cannot be checked from the inner plug. There were some problems such as.

This invention was made with the aim of improving this problem, and aims to facilitate maintenance and inspection by providing a track connecting pin with a pin plug that can be easily checked from the outside even when the oil level is low. It is something that we try to do.

Hereinafter, this invention will be described in detail with reference to an embodiment shown in FIG. 2. In the figure, 1 is a connecting pin body that endlessly connects links 2 constituting a crawler track, and 3 is a connecting pin body that is inserted into the pin body 1. When connected, the ends of the links 2 located on the inside are press-fitted into both ends of the bushing 3, and the ends of the links 2 located on the outside are press-fitted into both ends of the pin body 1. Also, the pin body 1
An annular counterbore 2a is formed inside the link 2 press-fitted to the side so as to surround the periphery of the pin body 1, and a thrust ring 4 and a dust seal are placed in the counterbore 2a so as to be in contact with the end surface of the bush 3. 5 is accommodated.

On the other hand, an oil hole 1a is bored in the center of the pin body 1, passing through both end faces. The lubricating oil sealed in the oil hole 1a is supplied between the pin body 1 and the bush 3 through the through hole 1b to lubricate these friction parts.
A large-diameter hole 1c, which is slightly larger than the inner diameter of the tube, is formed in the large-diameter hole 1c, and a cylindrical collar 6 made of a transparent (semi-transparent) resin such as polycarbonate, transparent polyamide, or translucent polypropylene is liquid-tightly inserted into the large-diameter hole 1c. It is press-fitted. A pin plug 7 made of an elastic material such as rubber is removably press-fitted into the center hole 6a of the collar 6, and the expanding force of the pin plug 7 prevents oil leakage, while at the same time making it difficult for the pin plug 7 itself to come out. There is.

A hole 1d smaller in diameter than the inner diameter of the oil hole 1a is formed at the other end of the oil hole 1a, and a pin plug 8 made of a translucent elastic material such as polyurethane rubber is press-fitted into the small diameter hole 1d. Above pin plug 8
A tapered head 8a is formed at the inner end of the oil hole 1a and contacts the tapered portion 1e formed between the oil hole 1a and the small diameter hole 1d from the inside.
a prevents the pin plug 8 from coming out.

As detailed above, this idea has one oil hole inside.
A large-diameter hole 1c, which is slightly larger than the inner diameter of the oil hole 1a, is provided at one end of the pin body 1 having a diameter of 100. Since the pin plug 7 made of an elastic body is press-fitted into the collar 6 so as to be freely insertable and removable, an annular transparent part is formed around the pin plug 7 along the inner circumference of the oil hole 1a. Even if the amount of oil in the oil hole 1a decreases, it can be easily checked from the transparent part. As a result, the amount of oil in the oil hole 1a can be estimated quantitatively without removing the pin plug 7, making maintenance and inspection easier. By tightly fitting the transparent pin plug 8 into the hole 1d, light can more easily enter the oil hole 1a, which has the effect of making it easier to check the amount of oil in the oil hole 1a.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a conventional connecting pin, and FIG. 2 is a cross-sectional view of a connecting pin according to an embodiment of the present invention. 1 is the crawler linking pin body, 1a is the oil hole, 1c is the large diameter hole, 6 is the collar, 6a is the center hole, and 7 is the pin plug.

Claims (1)

[Scope of utility model registration request] In one in which links 2 constituting a crawler track are connected by a track connecting pin body 1 having an oil hole 1a inside, an oil hole 1 is provided at one end side of the connecting pin body 1.
A large-diameter hole 1c having a slightly larger inner diameter than the inner diameter of a is provided, and a cylindrical collar 6 made of a transparent (or semi-transparent) body is fitted into this large-diameter hole 1c in a fluid-tight manner. A crawler linking pin is formed by removably press-fitting a pin plug 7 made of an elastic material into a central hole 6a.