JPS5939107Y2 - Truck crawler for endless track equipment - Google Patents

Description

[Detailed description of the invention] This invention relates to a track roller for an endless track device. Conventionally, this type of track roller has a boss portion shaped like the one through which the shaft passes, as shown in Fig. 1. If a bearing is inserted in the boss, oil seals must be installed from both sides of the boss, which has the disadvantage of complicating the structure.

Additionally, it is difficult to inject grease into the internal bearings.
We had no choice but to create a complicated structure in which the shaft was provided with an oil supply hole that led from the shaft part exposed outside the boss into the inside of the boss.

This invention aims to eliminate the above-mentioned drawbacks.

This invention will be explained in detail based on an embodiment shown in the drawings. Reference numeral 1 represents a vehicle body frame, and 2 represents a pipe that supports a track roller shaft whose left and right intermediate portions are welded to the vehicle body frame 1.

Reference numeral 3 denotes a track roller shaft which can be fitted into the pipe 2 and has a male thread 3a machined at its base end.
A cut surface 3b into which a spanner or the like is fitted is formed on a part of the circumferential surface of the process a, and a stepped portion 3 is formed on the tip side by a predetermined dimension from the side surface to the base side.
c, and is configured so that bearings can be fitted to both sides of this stepped portion 3c.

4, 4 is a bearing, and 5 is an oil seal.

Reference numeral 6 denotes an oil shutter, which is made by molding rubber on the entire outer circumferential surface of an iron collar or only on the shaft-fitting part, and is structured to fit tightly onto the track roller shaft 3.

Reference numeral 7 denotes a track roller, which is made of aluminum alloy or synthetic resin, and has a fitting ring 10 fitted on the circumferential surface thereof that fits into the vertical groove 9 of the endless track band 8, and a bearing boss 11 on one side of the left and right sides. One side is formed into a front surface 12, and the other side is opened to form a pot shape that can be turned sideways.

Furthermore, when the track roller 7' is made of synthetic resin as shown in FIG. 5, the front surface 12 becomes weak.
A cover body 13 made of iron plate is buried in the bearing boss 11 and the front surface 12 is
Department.

In order to attach the track roller 7 configured as described above to the vehicle body frame 1, first, the I.
When the rack roller 7 is made of aluminum alloy, the bearings 4, 4 are attached to the stepped portion 3 of the track roller shaft 3.
The bearing boss 11 of the track roller 7 is fitted on both sides of c.
After inserting it into the bearing 4' with the stop ring 14,
The oil shutter 6 is inserted from the base end side of the track roller shaft 3 to prevent it from coming off, and the oil seal 5 is fitted between the oil shutter 6 and the inner peripheral surface of the bearing boss 11.

A dustproof collar 1 is attached to the opening side end surface of the bearing boss 11.
5 is inserted into the track roller shaft 3 and pressed against it, the base side of the track roller shaft 3 is inserted into the pipe 2, the rotation stop washer 21 is fitted onto the track roller shaft 3, and the spring washer 16 and the nut 17 are used to tighten the track. Roller shaft 3
Tighten it to the end of pipe 2.

At this time, when tightening, the track roller shaft 3 tends to rotate freely, but a spanner is fitted to the cut surface 3b of the shaft end to prevent this and securely tighten.

Then, one side of the collar 15 is brought into contact with one inner end of the bearing 4' via the oil shutter 6, and the other side is received by the end of the pipe 2. In this state, the rotary washer 21 is moved as shown in FIG. The rotation of the track roller shaft 3 is stopped by bending from the virtual line to the solid line.

In this way, the l-rack roller 7 is freely rotated relative to the track roller axis 3.

Next, in the case of a track roller made of a synthetic resin material as shown in FIG. 5, the track roller shaft 3 is provided with a large-diameter portion 18 at the tip to prevent the bearing from slipping out, and the stepped portion 3C of the track roller shaft 3 is As the discontinued shape, after inserting two bearings side by side into the tip, this bearing 4.4'
Then, the lid body 13 is injection-processed onto the track roller bearing boss 11.

At this time, if an eccentric arcuate groove 19 is provided in the outer circumferential surface of the bearings 4, 4', the resin of the boss part will intervene in this groove 19, and the bearing will be prevented from slipping out and rotating. .

In this way, the track roller 7' whose sides are blinded by the lid 13 is rotatably provided with respect to the track roller shaft 3, and when it is attached to the vehicle body frame 1, the oil shutter 6 and the oil The seal 5 and dustproof collar 15 are assembled and installed.

Then, a grease nipple 20 communicating with the inside of the boss is attached to the front surface 12 of the bearing boss 11 of the track roller 7 provided as described above, and grease is injected from the outside of the front surface 12. I try to add grease to 4'.

By attaching the track roller 7 to the rack roller shaft 3 to 1 as described above, it is possible to eliminate the oil seal on the front side 12 of the bearing boss 11 where the bearing 4° 4 is fitted, and also to provide a muddy water seal to the bearing. can be done with certainty.

Furthermore, since the oil seal can be eliminated on one side, by attaching the grease nipple 20 to the front surface 12, it is possible to easily grease the bearing without being obstructed by the oil seal, and the lubrication means can be extremely simplified. When the track roller 7 is molded from a synthetic resin material, the strength of the boss can be increased by integrally molding the front surface 12 with the iron cover 13.
It is easy to attach the grease nipple 20 to the third part, and muddy water or the like does not enter through the grease nipple attachment hole and the strength of the grease nipple attachment part is not impaired.

In this invention, a track roller for a track roller is rotatably provided on the minus side, and a rotation preventing portion is provided on the other side of the track roller shaft on the vehicle body frame side, and the bearing boss of the track roller is connected to the vehicle body frame. One side opposite to the side is formed as a front side, the other side on the side of the vehicle body frame is opened to form a sideways pot shape, and the end of the track roller shaft is fitted into the bearing provided in the bearing boss, Since the track roller for the endless track device is configured such that the front part of the bearing boss is provided with a grease nipple for sealing grease that communicates with the boss, when the track roller shaft is fixed to the vehicle body frame, the roller shaft By providing the rotation stopper on the vehicle body frame side, one side of this side can be formed on the front side without providing it on the side opposite to the vehicle body frame side of the bearing boss, and the oil seal on this side can be eliminated. This makes assembly easier and improves the sealing performance of the bearing.

Furthermore, since the oil seal on one side can be eliminated, a grease nipple can be attached to the front side, and the bearing can be easily greased without being obstructed by the oil seal, making the construction extremely simple.

[Brief explanation of drawings]

The figures show one embodiment of this invention; Fig. 1 is a front sectional view of the conventional device, Figs. 2 and 3 are front sectional views of the invention of the present invention, and Fig. 4 is the same as that shown in Fig. 3. A front sectional view showing the relationship between the track roller and the endless track belt, and FIG. 5 shows a separate front sectional view. Symbols 7 and 7' in the figure are track rollers, 11 is a bearing boss of the track rollers, 12 is a front part, 13 is an iron lid, and 20 is a grease nipple.

Claims (1)

[Scope of utility model registration request] A track roller for an endless track device is rotatably provided on one side of the track roller shaft, and a rotation preventing portion for the shaft is provided on the other side of the shaft on the vehicle body frame side, and the bearing boss of the track roller is mounted on the opposite side of the vehicle body frame. One side is formed as the front side, and the other side on the body frame side is opened to form a sideways pot shape, and the end of the track roller shaft is fitted into the bearing provided in this bearing boss, and the front side of the bearing boss is formed. A track roller for an endless track device, the part of which is provided with a grease nipple for sealing grease that communicates with the boss.