JPS6036532Y2 - endless track belt - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a track belt (track) in a tracked vehicle such as a construction machine such as an excavator bulldozer, and particularly relates to a pin that connects links constituting a track belt and the area around this pin. This relates to technology for lubricating the sliding surface between the bushing and the loosely fitted bushing.

2. Description of the Related Art Conventional endless track belts forming the undercarriage of tracked vehicles include those shown in FIGS. 1 and 2.

In these figures, the two rows of links 1 and 2 that make up the track belt each have a bush 3 fitted into one side of the link.
They are connected endlessly via pins 4 and fixed to a shoe 20 which is like a mating plate, thereby forming a track band.

That is, as shown in detail in FIG. 2, each side A part of the link 1.2 is fitted into and fixed to the bushing 3 that is loosely fitted into the pin 4, and each opposite side B part is press-fitted into the end of the pin 4. It is fixed and successively connects many links in the same way to form a chain.

In addition, in order to reduce wear on the sliding surface between the pin 4 and the bush 3 in the endless track belt configured as described above,
A seal 21 is installed to prevent muddy water from entering this sliding surface.

Therefore, the sliding surface between these pins 4 and bushings 3 is
Grease is applied initially during assembly, which is equivalent to a dry condition, and the lubricity is poor, causing problems such as wear and the generation of squeaks.

Therefore, in order to extend the life of these pins and bushes, it is necessary to adopt an oil lubrication system that supplies oil to the sliding surfaces between the pins and bushes.

However, to do so requires the following:

(i) A sealing mechanism is required to prevent oil from flowing into the outside air between the pin and bushing and between links, and to prevent muddy water from entering between the pin and bushing.

(ii) A lubrication mechanism is required that takes into account costs, maintenance, etc.

Therefore, the present invention aims to provide an endless track belt that can fully satisfy these requirements.

That is, the present invention provides an oil supply hole that communicates from at least one end of a pin that connects links constituting an endless track band to a sliding surface between the pin and a bush loosely fitted around the pin. At the same time, an O-ring is fitted into the annular groove provided on the pin end side of the oil supply hole, and the tip is tapered so that it can be removed so that it can be connected to a oil supply device that supplies oil to each pin at the same time when refueling. The oil supply hole is characterized in that a stopper having a stepped portion connected to the tapered portion is inserted into the pin end side portion of the oil supply hole so that the stepped portion engages with the O-ring, thereby sealing the oil supply hole.

Embodiments of the present invention will be described in detail below with reference to the drawings.

3 to 5 show an example of the endless track belt according to the present invention together with its oil supply device.

In particular, as shown in detail in FIG. 3, in this embodiment, in order to supply lubricating oil to the sliding surface 19 between the bushing 3 and the pin 4, the sliding surface 19 is applied from one end of the pin 4. At the same time, an annular groove 15 is provided in the pin end side of the oil hole, and an O-ring 16 made of an elastic material such as rubber is fitted into this annular groove, and a taper 18 is formed inside the O-ring 16. And a nozzle 6 having a stepped portion 17 is attached.

The nozzle 6 is connected to an oil guide pipe 8 via a flexible tube 7.

The number of nozzles 6 is the same as the number of pins 4 in the oil guide pipe 8, and the nozzles 6 are provided in the oil supply hole of each pin 4 of the endless track belt, which is constructed by connecting the pin 4, bush 3, and links 1 and 2, as shown in FIG. It is inserted and fixed into an O-ring 16 provided at 5.

In this state, the vacuum pump 9 connected to the rear end of the oil guide pipe 8 evacuates the space including the pipe line so that oil sent from the oil pump 10 connected to the tip of the oil guide pipe can easily enter. Make it.

During this evacuation, valve V1 is open, oil system valve V2. V
3 is considered closed.

When the evacuation is completed, valve V1 is closed manually or automatically, valve V2. When V3 is opened, the oil pump 10 is operated and oil is sent to the sliding surfaces 19 between the pins 4 and the bushes 3, respectively, and then V2. V3 is closed, the oil pump 10 is stopped, and oil is filled.

Thereafter, as shown in FIG. 5, the nozzle 6 is removed, and a plug 11 having the same external shape as the nozzle, that is, a plug 11 having a tapered tip and a stepped portion connected to the tapered portion is inserted. It is inserted into the pin end side portion of the oil supply hole 5 so as to engage with the ring 16, and the oil supply is completed.

Note that a seal 12 is fitted in advance to prevent the supplied oil from leaking.

According to the configuration described above, the same number of nozzles as the pins connected to the oil guide pipe are inserted into the O-ring provided in the oil supply hole of each pin, and oil is supplied to each pin at once by the oil pump provided at the end of the oil guide pipe. can be supplied to

When refueling, the air in the space is removed by a vacuum pump, and the lubricating oil sent by the oil pump tends to fill the sliding parts.

In the second embodiment shown in FIGS. 6 and 7, an oil supply hole 5 formed in the pin 4 is passed through between both ends of the pin, and the end is connected to a nozzle 6 similar to the nozzle 6 shown in FIG. gradient,
As shown in FIG. 7, U-shaped flexible oil guide pipes 14 with stepped nozzles 13 are inserted alternately into the oil supply holes 5 of each pin 4 to form a continuous pipe. Oil is supplied from one direction of the conduit oil by an oil pump 10, and the oil supply part is filled up while pushing out air accumulated in the oil supply part.

After refueling, the nozzle 13 is removed, and the plugs 11 shown in FIG. 5 are inserted into both ends of the refueling hole 5 of each pin 4 and sealed, thereby completing the refueling operation at once.

Note that an annular groove similar to that shown in FIG. 3 is provided in the end side of each pin of the oil supply hole 5, into which an O-ring 16 is fitted, and the nozzle 13 or plug 11 is engaged with this O-ring. It is inserted so that

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a part of a conventional endless track belt, Fig. 2 is an enlarged cross-sectional view of a part thereof, and Fig. 3 is an example of an endless track belt according to the present invention, showing an example of its oil supply system. Fig. 4 is a sectional view showing the lubricating mechanism of several pins together with its lubricating device, Fig. 5 is a sectional view of the pin in a plugged state, and Fig. 6 is a cross-sectional view of the pin in the plugged state. An enlarged sectional view showing a part of the oil supply device together with the pin end in a modified example of the invention,
FIG. 7 is a sectional view showing the entire oil supply system. 1.2... Link, 3... Bush, 4
...Pin, 5...Oil supply hole, 6...
...Nozzle, 7...Flexible tube, 8
... Oil guide pipe, 9 ... Vacuum pump, 11
...Oil pump, 11...Bung, 12...
...Seal, 13...Nozzle, 14...
... Oil guide pipe, 15 ... Annular groove, 16 ...
...01Jng, 17...Danbe, 1 death...
・Taper, 19...Sliding surface.

Claims (1)

[Scope of utility model registration request] An oil supply hole is provided that communicates with the sliding surface between this pin and a bush loosely fitted around the pin from at least one end of the pin that connects the links that constitute the endless track belt, and a pin of this oil supply hole is provided. An O-ring is fitted into an annular groove provided on the end side, and the tip is tapered and a step connected to the tapered part is removable so that it can be connected to a lubrication device that lubricates all the pins at once during lubrication. 1. An endless track belt, characterized in that a stopper having a section is inserted into the pin end side portion of the oil supply hole so that the stepped section engages with the 01J ring, and the stopper is sealed.