Endless belt power transmission systems or components – Belt having drive surfaces on opposite side edges of stacked...
Patent
1997-12-16
2000-06-13
Fenstermacher, David M.
Endless belt power transmission systems or components
Belt having drive surfaces on opposite side edges of stacked...
474202, 474242, F16G 100
Patent
active
060743174
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to improvements in a belt for a continuously variable transmission of the type wherein the belt is passed on drive and driven pulleys to accomplish power transmission from the drive pulley to the driven pulley, more particularly to the improvements to prevent the belt from slipping relative to the pulleys.
BACKGROUND ART
A variety of belts have been proposed and put into practical use for a continuously variable transmission of the type wherein the belt is passed on drive and driven pulleys. A typical one of such belts includes an endless (loop-shaped) steel belt or cylindrical ring which is formed by laminating a plurality of endless steel sheets. A plurality of steel elements are supported on the ring in a manner to be aligned along the periphery of the ring so that the adjacent ones are contactable with each other. Each pulley includes axially movable and fixed wheel counterparts which are coaxial with and face each other to define therebetween a pulley groove. The axially movable wheel counterpart is axially movable under an axial thrust of a controlled hydraulic pressure so as to change the width of the pulley groove. The belt is put in the pulley groove in such a manner that the opposite side edge faces of each element are in frictional contact with the frustoconical surfaces of the respective movable and fixed wheel counterparts of each pulley.
However, the following drawbacks have been encountered in such a conventional belt: That is, an initial clearance is produced between the adjacent elements when the belt has been assembled. Additionally, the steel ring of the belt is extendable under a tension applied to the belt when the transmission is operated upon the belt being passed on the drive and driven pulleys. As a result, a slip has been unavoidably generated between the belt and the drive and driven pulleys. This degrades the durability of the belt while lowering a power transmission efficiency of the continuously variable transmission.
DISCLOSURE OF INVENTION
It is an object of the present invention to provide an improved belt for a continuously variable transmission, which can effectively overcome drawbacks encountered in conventional belts for a continuously variable transmission of the same type.
Another object of the present invention is to provide an improved belt for a continuously variable transmission, which is high in durability while improving a power transmission efficiency of the transmission.
A further object of the present invention is to provide an improved belt for a continuously variable transmission, which can effectively suppress a slip of a belt relative to a pulley of the transmission regardless of a changing transmission ratio of the transmission.
A belt of the present invention is for a continuously variable transmission and comprises a rigid ring. A plurality of rigid first elements are supported on the ring and aligned in a peripheral direction of the ring to be adjacent to each other. Each element has first and second surfaces which respectively face forward and rearward of the element in a direction of rotation of the ring, a first locking edge formed at the first surface, and a second locking edge formed at the second surface. The first and second surfaces of the respective adjacent elements are contactable with each other. The first surface includes a first inclined face formed radially inward of the first locking edge and extending radially inward from the first locking edge so that thickness of the element gradually decreases in a radially inward direction, and a first radially outward face formed radially outward of the first locking edge and extending radially outward from the first locking edge. The second surface includes a second face formed radially inward of the locking edge and extending radially inward from the second locking edge, and a second radially outward face extending radially outward of the second locking edge and extending radially outward from the second locking edge. The second face is depressed re
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Fenstermacher David M.
Nissan Motor Co,. Ltd.
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