Endless belt power transmission systems or components – Positive drive belt – Drive surfaces on belt formed in or interconnected by...
Patent
1987-05-04
1989-01-24
Bui, Thuy M.
Endless belt power transmission systems or components
Positive drive belt
Drive surfaces on belt formed in or interconnected by...
474268, F16G 112
Patent
active
047999195
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates generally to mechanical engineering, and more particularly to cogged belts of belt transmissions.
2. Description of the Prior Art
There is known a cogged belt comprising an elastic base of which incorporates a carrying element and an element reinforcing belt cogs in the form of a corrugated strip with the corrugations embedded in the cogs. The carrying element has ports in the location of the cogs, these ports receiving the corrugations of the reinforcing strip having a width corresponding to the width of the ports. An insert is provided inside the cog between the walls of the corrugation of the reinforcing element (cf., USSR Inventor's Certificate No. 1,073,511, published in Bulletin "Discoveries, Inventions, Industrial Designs, Trademarks" No. 6, 1984).
The provision in the carrying strip of the ports receiving the corrugations of the reinforcing strip disturbs the integrity of the carrying element. Since the reinforcing element has a width equal to the width of the ports, the carrying capacity of the belt is affected because the force transmitted by the belt is taken up by the reinforcing element at portions comprising the corrugations, and by the carrying element at the portions between the corrugations to result in reduced carrying capacity of the cogged belt. In addition, the use of two layers, viz., carrying and reinforcing layers, makes the manufacture of the belt more expensive.
SUMMARY OF THE INVENTION
The invention aims at providing a cogged belt, in which a carrying element is constructed so as to ensure a higher carrying capacity of the belt and make the cogged belt less expensive to fabricate.
The aims of the invention are attained by a cogged belt comprising an elastic base of which incorporates a carrying element and an element reinforcing the belt cogs in the form of a corrugated strip with corrugations thereof embedded in the cogs. According to the invention, the reinforcing element has a width substantially equal to the width of the belt cog, and the carrying element is formed by locks disposed in the zone of the corrugations for power-locking their bases and portions of the reinforcing element interposed between the corrugations.
Preferably, each corrugation has the form of a trapezoid having its major base facing the vertex of the cog, whereas the lock is fashioned as a rectangular frame embracing the corrugation at the minor base.
Such an arrangement of the corrugations ensures a higher resistance to the action of tensile stresses exerted on the carrying element, whereas the lock is structurally quite simple.
Alternatively, each corrugation has the form of a trapezoid having its major base the vertex of the belt cog, whereas the lock is fashioned as a rectangular frame embracing the corrugation at its major base, the interior of the corrugation accommodating an insert having a length exceeding the length of the lock cross-sectionally of the belt.
This construction of the cogged belt prevents the tendency of the corrugations to stretch, even when high loads are imparted thereto.
Alternatively, the element reinforcing the cogs of the belt has longitudinally extending cuts in the zone of arrangement of the cogs to form corrugations at both sides of the reinforcing element, whereas the lock is fashioned as an insert placed between the corrugations with an interference fit.
The just described arrangement of the reinforcing element and lock is employed during fabrication of two-sided cogged belts of high cog rigidity.
The cogged belt embodying the present invention offers a higher cog rigidity as compared with prior art one- and two-sided cogged belts. Cogged belts of the herein proposed construction are virtually free from the tendency to form fatigue cracks at the cog base, whereas their side surface lasts longer than that of the known belt cogs. In addition, the proposed cogged belts are relatively inexpensive to manufacture.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an axonometric view of a cogged belt
REFERENCES:
patent: 2184796 (1939-12-01), Evans et al.
patent: 2189049 (1940-02-01), Ungar
patent: 4198875 (1980-04-01), Schneider
Boikov Vladimir P.
Guskov Valery V.
Kozachevsky Gennady G.
Molodan Oleg I.
Sizova Svetlana I.
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