Method of making a cast engine cylinder having an internal passageway
AssigneeTecumseh Products Company
InventorGar M. Adams
Life of this patent
Estimating the term…
Abstract
A cast cylinder for an internal combustion engine having an intake valve cavity located on one side of the piston bore, an intake bore for communication with a carburetor located on the other side of the piston bore, and an internal passageway cast therein communicating the intake bore and the intake valve cavity. The internal passageway is curved and circumscribes a portion of the intake bore. A walled hollow tube having initially closed ends is embedded in the cast cylinder during casting as a permanently retained casting core. Subsequently the ends of the embedded tube are machined open to communicate with the intake valve cavity and the intake bore, respectively, to define the internal passageway.
Claims6
A method of making a cast cylinder assembly having an internal passageway for an internal combustion engine comprising:
- (a) providing a mold suitably shaped for casting a cylinder including an intake valve cavity for an internal combustion engine, the mold including a core cavity for receiving a casting core for forming an internal passageway communicating with the intake valve cavity;
- (b) providing a casting core formed as a walled tube having closed ends and a hollow interior in the shape of the internal passageway to be formed;
- (c) inserting and holding the casting core in the cavity such that one end thereof is adjacent the intake valve cavity to be cast;
- (d) casting molten metal in the mold about the casting core such that the casting core is embedded therein;
- (e) removing the cast cylinder with embedded casting core from the mold;
- (f) opening the embedded walled tube adjacent one end thereof to place the walled tube in communication with the intake valve cavity;
- and
- (g) opening the embedded walled tube adjacent the other end thereof.
Dependencies are inferred from the claim text.