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A reliable and simple bidirectional clutch, utilizing wrap-down and overrunning clutch springs, is shown above.
English (United States)
This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately
78% of the total text.
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Bidirectional Wrap-Down Spring Clutch
A reliable and simple bidirectional clutch, utilizing wrap-down and
overrunning clutch springs, is shown above.
The driving arbor 1 is fastened as by a set screw to shaft 4, while the
intermediate arbor 2 and the driven arbor 3 both rotate freely on shaft 4. The
driven arbor 3 may be connected to a gear, timing belt pulley, etc., not shown in
the drawing. The left external spring 5 is right-hand wrapped and is held to
arbor 1 by a retaining clip 6 so that during operation it may be wrapped down on
arbor 2 by actuating shoe 7. The right external spring 8 is left-hand wrapped and
is held to arbor 2 by a retaining clip 9 so that during operation it may be wrapped
down on arbor 3 by actuating shoe 10. The left internal spring 11 is right-hand
wrapped and is slightly press fitted into arbors 1 and 2, while the right internal
spring 12 is left-hand wrapped and is slightly press fitted into arbors 2 and 3.
During operation, if the shaft 4 is turning counterclockwise as viewed from the
left, then both the left external spring 5 and the left internal spring 11 slip and no
motion is transferred to arbors 2 and 3. However, if shoe 7 is pressed against
spring 5, then the left external spring 5 grips arbor 2 forcing arbor 2 to rotate with
arbor 1. When arbor 2 rotates counterclockwise, the right internal spring 12
wraps outward, gripping arbor 3 and forcing it to turn with arbors 1 and 2.
However, if shaft 4 is rotating clockwise, as seen...