JPS5814354B2 - Tracked vehicle drive system - Google Patents

Description

[Detailed description of the invention] The present invention relates to a drive device for a tracked vehicle.

Traction force is applied to the track of a tracked vehicle when the track pusher engages with the sprocket, but at this time, the outer periphery of the track pusher comes into contact with the tooth surface of the sprocket, and when moving forward, the pusher moves away from the tooth surface. Also, when moving in reverse, slipping occurs between the pusher and the teeth when the pusher engages, causing wear on the pusher outer circumferential surface and the sprocket tooth surface.

And with the conventional crawler push and sprocket, the push that wraps around the sprocket MC is all in contact with the tooth, so the more it gets caught, the more wear progresses.

Of the suspension equipment that accounts for most of the user's costs, special shoe assemblies are the main component, and among these, the special link pitsuna elongation and push outside diameter wear have a short lifespan.

In response to this, the link pitch elongation has been improved due to the development of oil-filled crawlers in recent years, and for this reason, the elongation of the link pitch is determined by the life of the shoe assembly and wear on the outer diameter of the push. It has been done.

In other words, the entire crawler track wrapped around the sprocket does not come into contact with the sprocket teeth equally and traction is generated, but this traction force is obtained within the range where the winding starts.
After that, the traction force gradually decreases, and we focused on the fact that the wear in this part is due to contact wear caused by inclusions such as sand, rather than the occurrence of traction. Approximately half of the track push that wraps around the sprocket is floated above the sprocket teeth, reducing the number of times the push contacts the tooth by about half, reducing wear caused by contact with the tooth and extending the life of the push. It is an object of the present invention to provide a drive device for a tracked vehicle that achieves the following.

The configuration will be explained below based on the embodiment shown in the drawings.

Sprocket teeth 2 are provided on the outer periphery of a sprocket 1 in a shape in which one tooth out of every three teeth is notched.

Note that the shape indicated by the dotted line in the figure is a conventional tooth profile.

In addition, a ring 3 is fixed on both sides of the teeth of the sprocket 1,
The ring 3 of the sprocket (which is designed to support the ring 4 of the crawler track that engages with the sprocket) is circular or polygonal, and is formed integrally with the sprocket 1 or is provided separately and bolted together.

Further, the ring 3 may be allowed to rotate freely without being separated from the sprocket 1.

The bases of the teeth on both sides in the winding direction (circumferential direction of the subrocket 1) and the missing teeth of each set of the above-mentioned three tooth ridges,
Furthermore, as shown in FIG. 3, the bottoms of the three tooth ridges are recessed to prevent the push 5 of the crawler track from coming into contact with this portion.

In addition, the height of the teeth located on both sides of the three teeth of each set is lowered to prevent the strength from being lowered against the above-mentioned scraping.

Generally, the number of teeth of this sprocket is an odd number, and the pusher 5 should be evenly bitten by each tooth.However, the number of teeth of the sprocket of the present invention must also be an odd number. Since the number of sprocket teeth 2 is the sum of 3 tooth ridges and 1 missing tooth ridge, that is, a multiple of 4, the number of teeth and tooth profile are changed in only one place.

FIG. 2 shows an example in the case of a sprocket with 27 sprockets.

Although not shown in this figure, it is assumed that there is a ring on both sides of the sprocket 1, and that the ring of the crawler track that meshes with the sprocket is supported by this ring.

In the figure, reference numeral 6 denotes teeth having a set of three teeth, and each teeth 6 is fixed to the sprocket body side with a space corresponding to one notched tooth.

1 is an adjustment tooth with 2 teeth, and this 1 adjustment tooth makes the number of sprocket teeth an odd number.

From this point on, the pusher 5 of the crawler belt is always bitten by at least one tooth.

In addition, in the case of a sprocket with 29 teeth, the adjustment teeth will be 4 teeth.Next, let's consider the engagement situation with the sprocket with 27 teeth.

First, if the number of tracks, that is, the number of pushes is not a multiple of 3, the same push will cause the sprocket to rotate in one direction, and after all the teeth (including the notched teeth) have bitten, it will return to the first tooth.

Therefore, at a rate of 1, the push will come into contact with the tooth.0 When the number of tracks is a multiple of 3 (excluding multiples of 9), the same push will make contact with the tooth surface (
(including the notch teeth) should be bitten.

Therefore, the difference in the tooth surface that initially bites is made into contact at a ratio of 100 to 100 degrees.

When the number of tracks is a multiple of 9 (excluding multiples of 27), the contact between the top and L will be stiff.

When the number of tracks is a multiple of 27, the push always gets stuck in the same teeth (including the notched teeth), and the push that wears out progresses and the push that does not wear at all breaks down, so the effect of improving the life is not obtained. do not have.

The present invention is as described above, and in a drive device for a tracked vehicle in which a sprocket having an odd number of sprocket teeth is used to wind and drive a crawler track, the ring 4 of the crawler track that winds around and meshes with the sprocket 1 on both sides of the subrocket 1 is used. In addition to providing a ring 3 to receive the sprocket from the inside, each of the sprocket teeth has a notch in every third tooth, and one tooth in the C2 tooth is notched in one place, or one tooth in each of the four teeth is notched. Since the drive device of the tracked vehicle is configured by driving the notched teeth on both sides of the third tooth in the winding direction and the first tooth notched so that the pusher 5 of the track does not come into contact with the sprocket 1. Approximately half of the crawler push that gets caught up in the sprocket teeth can be left floating without contacting the sprocket teeth. Therefore, the number of times the push contacts the tooth surface can be reduced to about half, reducing the wear of the push due to contact with the tooth surface. 0 which can be significantly reduced and extend the life of the push

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a front view of the main part, FIG. 2 is a front view of an embodiment of a sprocket with 27 teeth, and FIG. It is an example figure. 1 is sprocket, 2 is sprocket tooth, 3 is ring,
4 is the track ring, 5 is the track push.

Claims (1)

[Claims] 1. A ring 3 that receives from the inside the link 4 of the crawler track that is engaged with the sprocket 1 on both sides of the sprocket 1 on the drive gear of a tracked vehicle in which the crawler track is wound and driven by a sprocket having an odd number of sprocket teeth. At the same time, the sprocket teeth have one tooth notched every three teeth, and one tooth notch of two teeth or one tooth of four teeth is notched at one location, and the three teeth are cut out. A drive device for a tracked vehicle, characterized in that both hem portions in the winding direction and each notched portion in which one tooth is notched are driven so that the pusher 5 of the track does not come into contact with them.