JPS633346Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to the improvement of tracks for tracked vehicles, and in particular, it facilitates the tightening work and prevents bolt loosening, shear deformation, and breakage due to shear force between the tracks and links. This relates to the assembly structure between the track shoes and the links.

In the conventionally known method of assembling the track and the link, bolts are inserted into bolt holes passing through both the track and the link, and nuts are tightened to assemble them together.

However, with this method, when tightening the bolts to the upper and lower nuts, it is necessary to hold down both the bolt head and each nut to prevent rotation, which is inconvenient in terms of work.

In addition, if shearing stress is applied to the fastening bolts of the track while the tracked vehicle is running, the conventional structure that accepts this only by the frictional force of the contact surface between the track plate and the link, the bolt As a result of the loosening of the bolts, the shearing force on the bolts increases extremely, which then reduces the strength of the track due to acceleration, which often causes the bolts to wear, break, or loosen, causing looseness between the bolts and the links. It was hot.

In view of these circumstances, the present invention attempts to make a revolutionary improvement, and as a result, the assembly work of the tracks and links is simplified and completed. It consists of a crawler track and a link to be attached, and an assembly bolt for assembling the crawler track, and the assembly bolt has a flange portion approximately in the middle, and at least one of the bolt hole edges of the surfaces of the link and the crawler track that are to be overlapped with each other. has a recess into which the flange of the assembly bolt is inserted;
The link and the track are assembled using an assembly bolt with a flange fitted into the recess.

Hereinafter, description will be made based on each of the illustrated embodiments. In FIGS. 1 and 2, 1 indicates a track plate, 2 indicates a link, and 3 indicates an assembly bolt.

Bolt holes 11 are drilled in the track plate 1 in the vertical direction for the bolts 3 to pass through, and bolt holes 21 are similarly drilled in the corresponding positions on the link 2 side.
has been drilled. Further, a recess 22 is provided in the opening window of the bolt hole 21 of the link 2, facing the contact plane with the track board 1.

The bolt 3 has a large flange 31 approximately in the center thereof.
Further, the side surface of the flange 31 is provided with a flat part 32 which is cut into a flat surface, and the upper and lower end edges of the bolt are provided with threaded parts 3a and 3b as fastening means. is formed.

In the above configuration, the bolt 3 is inserted into the bolt hole 21 of the link 2, and the flange 31 of the bolt 3
is fitted into the recess 22, and the flat part 32 of the bolt is brought into contact with the wall surface of the recess 22.

Next, a nut 7 is screwed into the tip of the assembly bolt 3 protruding into the window 24 of the link 2 via a washer 6 to integrate the link 2 and the bolt 3.

Next, the bolt hole of the track plate 1, 11 is the link, the bolt fixed to 2, and the bolt 3 are fitted, and then the track plate 1 is fitted.
Threaded part 3 on the upper edge of the bolt protruding from the back side of
The assembly is completed by firmly tightening the nut 4 with the washer 5 to a predetermined torque in the same manner as described above in a.

Further, FIGS. 3 and 4 show a second embodiment of the present invention. That is, in the second embodiment, as in the first embodiment, a tightening bolt 3 having a flange 31 approximately in the center is used as a means for assembling the track plate 1 and the link 2; A counterbore 12 is also provided on the plate 1 side, facing the opening periphery of the bolt hole 11 and the side that contacts the link 2, and above the recess 22 of the link 2, a counterbore 12 corresponding to the above-mentioned counterbore 12 is provided. A bore 23 is provided.

Moreover, the tightening bolt 3 used in this case is
A flange 31 is provided approximately in the center of the flange 3.
A flat surface part 32 is formed by cutting a part of the lower part of the bolt 3 into a flat surface, and the upper edge of the tightening bolt 3 on the track side has a threaded part similar to that in the first embodiment. Further, a ring-shaped groove 33 is formed along the periphery of the lower edge.

In the above configuration, the link, the second bolt hole,
Insert the bolt 3 into 21 and link the bolt flange 31 and its flat part 32 to the recessed part on the 2 side, 22
After fitting and positioning the counterbore 23, the washer 6 is inserted into the link window 24.
through the stop ring, 8 through the ring-shaped groove, 33
The bolt 3 is fitted inside to stop the bolt 3 from moving in the axial direction, and the link side is installed.

In this case, the bolt 3 may have a slight gap in the axial direction.

It is of course possible to use a fastener such as an S ring, an E ring, or a push-on nut for the stop ring 8 other than the illustrated embodiment.

Next, the crawler track, bolt hole 11 of 1 and bolt hole 11
After fitting the counterbore 12 on the lower side into the bolt 3 and the upper part of the flange 31 protruding on the plane of the link 2, tighten the threaded part with the nut 4 through the washer 5 on the back side of the track shoe. The assembly is completed by fully tightening the screws 3a to a predetermined torque.

5 and 6 show a third embodiment of the present invention.

That is, the third embodiment is similar to the first and second embodiments described above in that a tightening bolt 3 having a flange 31 approximately in the center is used as a means for assembling the track plate 1 and the link 2. However, in the third embodiment, the counterbore portion described in the second embodiment is present only on the track plate 1 side, and the tightening bolt 3 used as the tightening means has a flange 31 approximately in the center. , a threaded portion 3a is provided on one side in the longitudinal direction, and a plurality of rows of annular grooves 33 are provided on the other side along the periphery thereof.

However, when assembling the link 2 and the track plate 1, the side of the tightening bolt 3 having the groove 33 is inserted into the bolt hole 21, and the recess 22 of the link and the bolt flat part 32 are fitted. Thereafter, the collar 9 is fixed in the link window 24 by compressing and caulking the collar 9 into the groove 33 through the washer 6 in the radial direction thereof.

Next, align the bolt hole 11 of the track plate 1 with the bolt hole 11 of the track plate 1 and insert it into the other side of the tightening bolt 3. At the same time, tighten the counterbore 11 of the track plate 1 while aligning the mounting surfaces of the link 2 and the track plate 1. After fitting the bolt 3 into the flange 31 that protrudes above, the bolt 3 is assembled by tightening the nut 4 on the threaded portion 3a of the bolt 3 that protrudes through the washer 5 on the back side of the track plate 1. Complete the attachment.

In the above case, the position of the counterbore 12 is reversed and only on the link 2 side, or the positions of the threaded part 3a and the groove part 33 of the tightening bolt 3 are reversed, or the right half of FIG. As shown in the drawing, without forming a groove 33 on one end side of the tightening bolt 3, this part is inserted into the bolt hole 2 of the link 2.
After the link is inserted into the window 24 of the link, the protruding portion is crushed and caulked, and various other design changes are possible.

Since the present invention is as described above, it can exhibit the following effects.

First, since the tightening bolts are connected to the grooves of the link by the flange flat part or counterbores provided on the flange flat part, the bolts do not rotate together when tightening the nut, which is different from the conventional method. It is much easier to work with than the conventional one.

Furthermore, when attaching the end edge of the tightening bolt to the link, you can use a fastener such as an S-ring or E-ring push-on nut, or caulk it with a collar, making the work much easier than conventional screw-fastening work. can be improved.

Second, the mutual shearing force between the track plate and the link during running is caused by the fit between the flat surface of the flange or counterbore provided on the bolt and the flange or counterbore applied to the link or track plate. Because it is received by the mating recess, no direct force is applied to the tightening bolt, so the attachment strength between the link and the track plate is significantly strengthened, and the positional deviation between the link and the track plate is prevented. As a result, the shearing stress exerted on the mounting bolts is significantly reduced, so that accidents such as wear, loosening, or breakage of the bolts will no longer occur.
It has various beneficial effects.

[Brief explanation of the drawing]

1, 3 and 5 are longitudinal sectional views of main parts showing the assembled state of the track plates and links representing each embodiment of the present invention, and FIGS. 2, 4 and 6.
The figures are perspective views of essential parts corresponding to the embodiments shown in FIGS. 1, 3, and 5, respectively. 1... Track plate, 2... Link, 3... Tightening bolt, 4, 7... Nut, 56... Washer, 8
... Fastener, 9 ... Collar, 11 ... Track plate bolt hole, 12 ... Track plate counterbore, 21 ... Link bolt hole, 22 ... Link groove, 23 ... Link window hole, 24 ... Link window , 31... Bolt flange, 32... Bolt flat part, 33... Bolt groove part, 34... Bolt caulking head.

Claims (1)

[Scope of claims for utility model registration] (1) A link and a shoe attached to the link,
It consists of an assembly bolt for assembling the link and the track plate, and the assembly bolt has a flange portion approximately in the middle and has a flat portion on at least one side of the flange portion, and the surface where the link and the track plate are overlapped. A link characterized in that at least one of the edges of the bolt hole has a recess into which the flange is fitted, and the link and the track plate are assembled using an assembly bolt with the flange fitted in the recess. An assembly of shoes and shoes. (2) In the utility model registration claim described in paragraphs (1) and (2), an assembly bolt having a flange portion approximately in the middle has threaded portions at both longitudinal ends thereof for tightening with nuts. An assembly of a link and a track plate, the link and the track plate being tightened by the tightening bolt. (3) In the utility model registration claims described in paragraphs (1) and (2), if an assembly bolt having a flange portion approximately in the middle has a threaded portion for tightening the nut on one longitudinal side thereof, In both cases, a fastener groove is provided on the other side, and a split ring or a push-on nut is narrowly fitted in the groove to engage the link or the track plate, and the link and the track plate are connected by the tightening bolt. The assembly of the link and the shoe plate after tightening. (4) In the utility model registration claim described in paragraphs (1) and (2), if an assembly bolt having a flange portion approximately in the middle has a threaded portion for tightening the nut on one longitudinal side thereof, Both have one or more grooves along the periphery on the other side, and the collar is fitted into the groove and then caulked, and the tightening bolt is used to tighten the link and the track plate. The assembly of the link and the shoes. (5) In the utility model registration claim described in paragraphs (1) and (2), the link and the track board are tightened using an assembly bolt having a flange portion approximately in the middle, and one bolt in the longitudinal direction An assembly of a link and a track plate, in which the side is a threaded part, the nut is tightened, the assembly bolt is inserted into the bolt hole of the link, and the other end is crushed and caulked. .