Endless belt power transmission systems or components – Friction drive belt – Including fabric web
Patent
1987-02-25
1989-07-11
Bui, Thuy M.
Endless belt power transmission systems or components
Friction drive belt
Including fabric web
474153, 474205, F16G 108
Patent
active
048467715
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates generally to mechanical drive belts, and more particularly to cogged belts used in power transmissions.
2. Description of the Prior Art
There is known a cogged belt an elastic base of which accommodates a carrying element in the form of spirally wound cords. In order to ensure increased rigidity of the cogs, their interior is provided with inserts of a harder material extending longitudinally of the belt cog (cf., e.g., U.S. Pat. No. 3,772,929). The carrying element and inserts are bonded therebetween only by the elastomeric base to result in the lack of rigid connection and consequently in a tendency to fatigue failure in the form of cracks at the cog root during operation of the cogged belt.
There is also known a cogged belt an elastic base of which accommodates a carrying element and an element reinforcing the belt cogs in the form of a corrugated band with the corrugations embedded within the cog interior. The carrying element has ports at the cog location for these ports to receive corrugations of the reinforcing band having a width corresponding to the width of the ports. Inserts are interposed between the corrugations of the reinforcing element and carrying element inside the belt cogs (cf., USSR Inventor's Certificate No. 1,073,511, published Feb. 15, 1984).
However, because the carrying element in the form of a band has ports receiving corrugations of the reinforcing band the integrity of the carrying element is impaired, whereas the reinforcing element has a width equal to that of the ports, whereby the carrying capacity of the belt is affected, since the force transmitted by the belt is taken up by the reinforcing element at sections thereof having corrugations, and by the carrying element at portions between the corrugations, which reduces the carrying capacity of the belt.
SUMMARY OF THE INVENTION
The invention aims at the provision of a cogged belt in which carrying and reinforcing elements would be so constructed as to substantially increase the carrying capacity of the cogged belt.
The aims of the invention are attained by a cogged belt an elastic base of which accommodates a carrying element and element reinforcing cogs. The belt is in the form of a corrugated band with corrugations thereof embedded in the cogs of the belt. According to the invention, the carrying element is continous throughout the length of the belt, whereas the reinforcing element and corrugations thereof have a width equal to the width of the carrying element substantially equal to the length of the belt cog. The reinforcing element is arranged at one side of the carrying element.
Making use of the carrying and reinforcing elements integral throughout the length of belt cog enables an increase in the rigidity of the belt cogs and enhances the carrying capacity of the belt.
Preferably, a portion of the reinforcing element which forms the corrugation has a thickness greater than a portion interposed between the corrugations.
The arrangement of the reinforcing element through reducing the thickness of the portions between the corrugations makes it possible to provide a cogged belt having a high lateral flexibility, whereas increasing the thickness of the corrugated portions provides cogs of higher rigidity to result in enhanced carrying capacity of the cogged belt.
Alternatively, each cog of the belt is hollow through the length of a space confined between the corrugation and carrying element.
Such an arrangement of the cog makes it possible to reduce the weight of the belt as a result of using less elastomeric material, and also to render the cogged belt less susceptible to heating while retaining its carrying capacity.
Preferably, the walls of the cogs have through holes extending longitudinally of the carrying layer.
Advisably, through holes are also provided at the portions of the cogged belt between its cogs.
The provision of said holes reduces noise arising during operation of the cogged belt transmission, because the compressed air can
REFERENCES:
patent: 2551578 (1951-05-01), Bendall
patent: 3772929 (1973-11-01), Redmond Jr.
patent: 4504256 (1985-03-01), Matsumura et al.
Boikov Vladimir P.
Gorodnichev Jury N.
Guskov Valery V.
Kozachevsky Gennady G.
Molodan Oleg I.
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