Cylinder block for water-cooled engine
AssigneeNissan Motor Co., Ltd.
InventorHajime Suzuki
Life of this patent
Estimating the term…
Abstract
A cylinder block for a water-cooled internal combustion engine has a top deck, a cylinder wall structure defining a row of cylinder bores, and a water jacket wall structure defining a water jacket around the cylinder bores. The jacket wall structure has a plurality of cylinder head bolt bosses each formed with a bolt hole for a cylinder head bolt for fastening a cylinder head on the top deck of the cylinder block. At least one of the head bolt bosses is a terminal head bolt boss which is formed at an end portion of the cylinder block, and which is connected, by a rib, with the cylinder wall structure and the top deck to prevent stress concentration and cracks.
Claims16
A cylinder block for a water-cooled internal combustion engine, comprising:
- a row of cylinder wall sections each defining a cylinder bore;
- a water jacket wall defining a water jacket around the row;
- a top deck connecting upper ends of the cylinder wall sections and an upper end of the water jacket wall and thereby defining an upper end of the water jacket in the cylinder block;
- a cylindrical head bolt boss having a cylinder head bolt hole, the head bolt boss being formed in the water jacket wall;
- and
- a rib formed between the head bolt boss located at an end of the cylinder block and an adjacent one of the cylinder wall sections, and connected with the head bolt boss, the top deck, and the adjacent one of the cylinder wall sections;
- wherein said head bolt boss is a terminal head bolt boss, and the cylinder block further comprises a cylindrical intermediate head bolt boss having an inside cylindrical wall surface bared in the water jacket and separated from the cylinder wall sections.
A cylinder block for a water-cooled internal combustion engine, comprising:
- a top deck;
- a cylinder wall structure extending underneath the top deck and defining a row of cylinder bores;
- a jacket wall structure extending underneath the top deck and defining a water jacket around the cylinder wall structure, the jacket wall structure comprising,
- a jacket wall comprising first and second end wall sections, and first and second side wall sections, the first end wall section being located between a first longitudinal end of the cylinder block and the row of the cylinder bores, the second end wall section being located between a second longitudinal end of the cylinder block and the row of the cylinder bores, the first and second side wall sections extending from the first end wall section to the second end wall section along the row, the first side wall section being on a first side of the row, and the second side wall section being on a second side of the row opposite to the first side,
- intermediate head bolt bosses formed in the first and second side wall sections, each intermediate head bolt bosses having a cylinder head bolt hole, and
- a terminal head bolt boss having a cylinder head bolt hole, the terminal head bolt boss being formed in the first end wall section, and connected with the cylinder wall structure by a rib extending from the top deck.
Dependencies are inferred from the claim text.