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US 5,211,102 AGranted
Knock pin arrangement for piston ring
AssigneeAtsugi Unisia Corporation
InventorHisakazu Muta
Life of this patent
Estimating the term…
Abstract
In a piston, a circumferential groove for a piston ring, a knock pin being inserted in a bore set radially relative to the piston ring groove. A head end of the knock pin protrudes into a space defined by the piston ring groove for interposing between ends of a piston ring for preventing turning, or rotation, thereof. Means for preventing mechanical interference between the walls of the piston ring groove and the head end of the knock pin is provided.
Claims9
A piston comprising:
- a piston head formed with a piston ring groove and a knock pin bore, said piston ring groove having upper and lower walls and an inner wall which cooperatively define said piston ring groove, said knock pin bore being communicated with said piston ring groove;
- a knock pin received in said knock pin bore and having an emergent portion protruding into said piston ring groove;
- means for preventing mechanical interference between said emergent portion and said upper, lower, and inner walls of said piston ring groove, wherein said means for preventing mechanical interference includes a recessed gap portion circumferentially surrounding a longitudinal shaft portion of said knock pin where said knock pin is emergent from said knock pin bore.
A piston comprising:
- a piston head formed with a piston ring groove and a knock pin bore, said piston ring groove having upper and lower walls and an inner wall which cooperatively define said piston ring groove, said knock pin bore being communicated with said piston ring groove;
- a knock pin received in said knock pin bore and having an emergent portion protruding into said piston ring groove;
- means for preventing mechanical interference between said emergent portion and said upper, lower, and inner walls of said piston ring groove;
- wherein said knock pin bore has an opening within said inner wall disposed toward one of said upper and lower walls from an equidistant point between said upper and lower walls;
- and
- wherein said means for preventing mechanical interference comprises a second bore of a larger diameter than said knock pin bore, and communicating, in alignment with, said knock pin bore at said opening.
3 more elements
Dependencies are inferred from the claim text.