Cooling structure of cylinder block
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsYoshikazu Shinpo, Takashi Matsutani
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Abstract
In a cooling structure of a cylinder block, a cooling medium is supplied into the cylinder block in which a water jacket continuously extends around a bore wall, so as to uniform the bore wall temperature. The cooling structure sets a cooling characteristic of the water jacket based on at least one of variation in the bore wall temperature in a direction perpendicular to the axis of the borehole and variation in the temperature of the cooling medium flowing around the bore wall. The structure improves the cylinder bore cooling efficiency or the cooling uniformity.
Claims21
A cooling structure of a cylinder block, comprising:
- a water jacket continuously extending around a cylinder bore wall so as to convey a cooling medium, the cooling medium cooling the bore wall by flowing around the bore wall;
- and
- a spacer provided in the water jacket that sets a cooling characteristic of the water jacket, at least one of a configuration, a shape and a heat transfer rate of the spacer varying based on the position of the spacer in the water jacket, the at least one of the configuration and the cooling characteristic of the water jacket varying based on at least one of a variation in a temperature of a cylinder bore wall in a direction perpendicular to an axis of boreholes and a variation in a temperature of the cooling medium in the direction perpendicular to the axis of boreholes, passing around the bore wall.
- perpendicular to the axis of boreholes, passing around the bore wall.
A cooling structure of a cylinder block, comprising:
- a water jacket continuously extending around a cylinder bore wall so as to convey a cooling medium, the cooling medium cooling the bore wall by flowing around the bore wall;
- a spacer disposed in the water jacket;
- and
- a mechanism that changes a position of cooling around an outer wall of the bore in accordance with a state of engine load,
- wherein when the engine load is low, the mechanism cools an upper portion of a cylinder bore-surrounding portion, and
- wherein when the engine load is high, the mechanism cools the upper portion of the cylinder bore-surrounding portion and a lower portion of the cylinder bore-surrounding portion.
Dependencies are inferred from the claim text.