Title:
A TOOTHED SPROCKET AND METHOD OF FORMING SAME
Document Type and Number:
WIPO Patent Application WO2002022288
Kind Code:
A3
Abstract:
The invention comprises a toothed sprocket and a method of forming same. The sprocket is formed from a pre-form (P), deep drawn cup. The sprocket is formed in a press using a stepped die (10) that forms the teeth or cogs in a gradual incremental movement of the die (10). Each step of the die (10) comprises a coplanar series of protrusions (15, 16, 17, 18) that cooperatively engage longitudinal splines. Each die step comprises a smaller radius as compared to the preceding step, when viewed as one progresses from the die face to the die base. The arrangement of the die steps causes the preform to be plastically formed into a toothed sprocket by the sequential application of each progressively smaller diameter step during the forming process.
Inventors:
HODJAT YAHYA
Application Number:
PCT/US2001/028127
Publication Date:
July 25, 2002
Filing Date:
September 07, 2001
Export Citation:
Assignee:
GATES CORP (US)
International Classes:
B21D53/28; (IPC1-7): B21D53/28
Foreign References:
| US3796106A | 1974-03-12 | |||
| US4876876A | 1989-10-31 | |||
| US5105697A | 1992-04-21 |
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