Internal-combustion engines – Poppet valve operating mechanism – Cam
Reexamination Certificate
2008-01-29
2008-01-29
Chang, Ching (Department: 3748)
Internal-combustion engines
Poppet valve operating mechanism
Cam
C123S090270, C029S888100
Reexamination Certificate
active
10492866
ABSTRACT:
A Method for the linking of cam rings to hollow shafts. In a first process step, the cam rings are manufactured, so as to generate their function-related contour, from two individual rings of different material connected to each other in a force-and form-closing manner, with the material of the outer ring being hard and elastic and having a permissible residual expansion of at least0.5%, and that of the inner ring being soft and plastically deformable. The cam rings together with the hollow shaft to be deformed are placed into an internal high pressure forming tool in a manner to suit the respective function. In a second process step through the application of an internal high pressure forming process and, due to the internal pressure exerted the cam rings are joined to the hollow shaft in a force-and form-closing manner. In a particular embodiment, the cam rings consist of two rings joined with each other in a force-and-form-closing manner with the inner ring being made of soft, plastically deformable material and the outer ring being made of a hard, elastic material.
REFERENCES:
patent: 5259268 (1993-11-01), Ebbinghaus et al.
patent: 19909184 (2000-09-01), None
patent: 62064428 (1987-03-01), None
patent: 62233562 (1987-10-01), None
Berliner & Associates
Chang Ching
LandOfFree
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