| 摘要 |
A variable diameter type cam shaft sprocket structure of an automobile is provided to prevent noise due to friction of a cam shaft by forming constantly a plurality of sections in a periphery of a cavity part of a sprocket unit. A sprocket unit(10) includes a plurality of sections(11) separated from each other at the same interval around a center of a cam shaft(2). A diaphragm(40) formed with a ring-shaped rubber tube is installed in a cavity part(12) of the diaphragm. A protrusion(13) is formed at each of the sections of the sprocket unit. A guiding groove part(23a,23b) is formed at a periphery of the protrusion. A pair of disk-shaped plate parts(20a,20b) are coupled along the guiding groove part. A fixing unit(30) fixes the sprocket unit and the plate parts to the cam shaft.
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