Endless belt power transmission systems or components – Plural belts or plural output loads
Reexamination Certificate
1999-07-15
2001-03-27
Bucci, David A. (Department: 3682)
Endless belt power transmission systems or components
Plural belts or plural output loads
C474S008000
Reexamination Certificate
active
06206796
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a power transmission mechanism using a transmission belt, and more particularly, to a power transmission mechanism using a plurality of metal belts having different sizes and connected between a driving pulley and a driven pulley as a transmission belt.
2. Description of the Related Art
A belt transmission mechanism, one of various types of transmission mechanisms for transmitting power, transmits a rotational force of a driving pulley to a driven pulley via a belt. The belt is usually made of a rubber material which is elastic and flexible. However, the above rubber belt transmission mechanism cannot transmit huge power while changing speeds. That is, a thick belt such as a V belt is deformed when the belt runs contacting the driving pulley or the driven pulley along a curved path of its circulation due to the thickness thereof. This is because the outer circumferential surface of the belt expands while the inner circumferential surface thereof compresses. Therefore, the power transmission mechanism using the above belt is not capable of transmitting huge power.
Also, a power transmission mechanism having a structure in which metal belts are overlaid integrally has been suggested. However, the belt of the above type is limited in its elasticity so that the belt is severed or slips on the pulley, lowering the efficiency. That is, when the speed rate is not 1, since the angular velocities of the inner circumferential surface and the outer circumferential surface of the metal belt are different from one another, miscellaneous forces or slippage occurs between the pulley and the metal belt so that the belt may be damaged and the efficiency in power transmission is considerably lowered.
Further, a metal belt having a structure in which metal push blocks are stacked has been suggested. The metal belt has a structure of hundreds of stacked push blocks manufactured through a precision process one by one. However, to obtain a belt, the hundreds of precise push blocks and a metal layered belt for supporting each push block should be assembled. Thus, manufacture thereof is difficult and the cost for manufacture thereof is very high.
SUMMARY OF THE INVENTION
To solve the above problems, it is an objective of the present invention to provide a metal belt power, transmission mechanism in which a plurality of thin metal belts are connected between a driving pulley and a driven pulley so that each metal belt circulates along a curved path around the pulley at an equal angular velocity during the operation of the mechanism and large power can be effectively transmitted regardless of the rate of change of the speed.
Accordingly, to achieve the above objective, there is provided a power transmission mechanism using metal belts which comprises: a driving pulley having first and second driving pulley-halves installed to be capable of advancing and retreating in an axial direction of a driving axis, the first and second driving pulley-halves having first and second belt guiding portions formed thereon to face each other, respectively, a driven pulley having first and second driven pulley-halves installed at a driven axis parallel to the driving axis to be capable of advancing and retreating along the driven axis, the first and second driven pulley-halves having third and fourth belt guiding portions formed thereon to face each other, respectively; and at least two metal belts capable of circulating around the belt guiding portions of the driving pulley and the driven pulley without interference, wherein each of the belt guiding portions is formed of an inclined surface having a predetermined curvature such that the angular velocity of all belts can be identical at an arbitrary speed rate between the driving pulley and the driven pulley.
REFERENCES:
patent: 3016755 (1962-01-01), Dittrich
patent: 3365967 (1968-01-01), Moogk
patent: 4795406 (1989-01-01), Dittrich et al.
patent: 5685793 (1997-11-01), Van Blaricom
patent: 602785 (1934-09-01), None
patent: 251655 (1934-09-01), None
Bucci David A.
Charles Marcus
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