Internal-combustion engines – Poppet valve operating mechanism – Rocker
Reexamination Certificate
2006-03-14
2006-03-14
Denion, Thomas (Department: 3748)
Internal-combustion engines
Poppet valve operating mechanism
Rocker
C123S090390, C123S090430, C123S090440, C123S090450, C074S559000, C074S569000
Reexamination Certificate
active
07011061
ABSTRACT:
There is provided a rocker arm of a kind in which even though the rocker arm is manufactured by the use of a press working technique the arm width can be minimized while the flat outer surface region of a required width is secured on an outer surface of the connecting wall, thereby contributing to reduction in size and weight of the rocker arm. This rocker arm1is capable of being driven by a cam2for selectively opening and closing a valve3of an internal combustion engine. This rocker arm1includes an arm body4prepared by bending a single plate material to represent a generally inverted U-shaped section including opposite side walls5and a connecting wall6bridging between the opposite side walls5. A roller10engageable with the cam2is rotatably mounted on a portion of the arm body4generally intermediate of the length thereof. A valve drive element8is mounted on one end of the arm body4for driving the valve4, while an end portion of the connecting wall6adjacent the other end of the arm body4is formed with an internally helically threaded hole12for threadingly receiving therein an externally helically threaded pivot member7. An outer chamfered corner delimited between an outer surface of the connecting wall6and an outer surface of each of the opposite side walls and formed by bending is deformed to represent a plastically deformed portion4aso formed by means of a plastic deformation technique that the outer chamfered corner represents a small radius of curvature R.
REFERENCES:
patent: 5678459 (1997-10-01), Motohashi et al.
patent: 5720245 (1998-02-01), Calka
patent: 6041747 (2000-03-01), Kotani et al.
patent: 6199527 (2001-03-01), Okubo et al.
Denion Thomas
NTN Corporation
Riddle Kyle M.
LandOfFree
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