Coupling mechanism

Details Coupling mechanism Coupling mechanism

2006-06-06

2006-06-06

Denion, Thomas (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

Tappet

C123S090520, C123S090550

Reexamination Certificate

active

07055479

ABSTRACT:
The invention proposes a coupling mechanism (1) for relatively movable elements (2, 3) of a switchable cam follower (4) of a valve train of an internal combustion engine, a high lift being obtainable upon coupling of said elements (2, 3) and a lift smaller than the high lift being obtainable upon uncoupling of said elements (2, 3), a first one (2) of said elements comprising a guide bore (5) for at least one coupling piston (6) which, for achieving coupling, can be displaced partly beyond a parting surface (7) between said elements (2, 3) into an aligned reception (8) of a second one (3) of said elements, wherein upon cam lift and coupling of said elements (2, 3), a contact zone (9) between the piston (6) and the reception (8) is clearly spaced from an edge section (10) of the reception (8) on the parting surface (7). This can be implemented in practice, for instance, through a special “backwards” oriented flattened portion (14) on the piston (6). Material loading on the edge section (10) is thus avoided.

REFERENCES:
patent: 4911112 (1990-03-01), Oikawa et al.
patent: 5845614 (1998-12-01), Tanaka et al.
patent: 6578535 (2003-06-01), Spath et al.
patent: 197 17 537 (1998-12-01), None
patent: 102 10 747 (2003-10-01), None
patent: 0 323 234 (1989-07-01), None

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