Wheel substitutes for land vehicles – With interposed friction drive belt
Patent
1992-10-16
1994-11-08
Stormer, Russell D.
Wheel substitutes for land vehicles
With interposed friction drive belt
305 35EB, 305 56, B62D 5524
Patent
active
053621425
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE ART
The present invention relates to a rubber crawler to be mounted in a transportable type construction machine, etc., especially a preferable combination linkage type rubber crawler which is mounted in a vehicle of such a type as both steel crawler and rubber crawler are concurrently used.
BACKGROUND OF THE INVENTION
Mainly, steel crawlers have conventionally been utilized as crawler mounted in transportable type construction machines, etc. Rubber shoes have been used in some of the steel crawlers. Recently, rubber crawlers are preferably utilized.
FIG. 1 is a sectional view showing an example of conventional steel crawlers; 11 is an outer flanged rolling wheel, 12 is a steel crawler shoe, 12a is a shoe plate, 12b is a shoe link, 12c is a linkage pin, and 12d is a lug (steel made).
FIG. 2 is a sectional view showing an example of rubber shoe; 13 is a rubber shoe, 13a is a shoe plate, 13b is a shoe link, 13c is a linkage pin, and 13d is a rubber lug.
FIG. 3 is a sectional view showing a conventional rubber crawler; 14 is a rubber crawler, 14c is a lug, 15 is a core member, and 16 is a steel cord.
In FIGS. 1 through 3, the same outer flanged rolling wheel can be concurrently used as rolling wheel in any case.
Hence, steel crawlers have the following advantages;
(1) its vibration is small because a continuous rolling track is obtained by combination of the track link at the inner circumference,
(2) Crawler come-off is scarce because there is no elongation nor phase error in the circumferential and width directions, and
(3) the durability is good because mechanical combination of respective links, etc. is large,
On the contrary, the steel crawlers inherently have the following disadvantages; fatigue, and
However, rubber crawlers have such advantages as mentioned below; comparatively high according thereto and in line with the above properties.
But, the rubber crawlers have the following shortcomings; interval are provided and utilized as rolling track. Accordingly, rolling wheels are likely to drop between the fore and back projections, thereby causing the vibration to be made somewhat large, slightly wave-like, and a thin rubber layer intervenes in the intermediate portion in the piled up area at both the ends of these steel cords, the crawler may be elongated when a remarkably high elongating force is given in the circumferential direction or the crawler itself may be distorted between the core members when an external force is given in the lateral width direction or come off due to those causes, and substance, and adhering force between core members and steel cords, and it is influenced upon the adhering force at the boundary between metal and rubber. The mechanical strength is much inferior to that of the steel crawler. Accordingly, the durability of rubber crawler is inferior to that of steel crawler.
From such circumstances, rubber shoe composed so that rubber lug is provided at the grounding side of shoe plate of the steel crawler has been partially utilized. The rubber shoe. As for the rubber shoe, it is made so that a shoe plate and non-vulcanized rubber are arranged in position in a metal mold and are press-vulcanized, and a rubber lug is adhered to the surface of the shoe plate at the same time as that of the vulcanizing molding.
However, in such a rubber shoe, weakest point in the composition of steel crawlers, shoe plate as steel structure and the ground and will have no space of escape, damage of the rubber lug will be promoted, to a linkage pin at a part where the shoe plate is wound and turned over, the interval between the fore and back shoe plates will be opened. For that reason, it is impossible to continue the rubber lug across the interval of shoe plates, and soil and mud may enter between shoe plates on weak road surface to cause a shortage of floating. In order to improve this, if the width of shoe plate is increased to reduce the ground-contacting pressure, the total weight may be also increased, instead, its bouyancy is lowered and it will be a change for the worse.
REFERENCES:
patent: 3649085 (1972-03-01), Comellas
patent: 4241956 (1980-12-01), Meisel, Jr.
Fukuyama Gomu Kogyo Kabushiki Gaisha
Stormer Russell D.
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