Heat exchanger

A heat exchanger, comprising:

• a plurality of core plates including a plurality of first core plates and a plurality of second core plates, stacked alternatingly in a stacking direction;
• a plurality of oil flow paths and a plurality of coolant flow paths alternatingly formed between the plurality of core plates in the stacking direction;
• each of the plurality of core plates including:
• a pair of oil passage holes including a first oil passage hole and a second oil passage hole arranged at opposite sides of the respective core plate in a first direction extending perpendicular to the stacking direction;
• a pair of coolant passage holes including a first coolant passage hole and a second coolant passage hole, the first coolant passage hole disposed adjacent to the first oil passage hole in a second direction extending perpendicular to the stacking direction and to the first direction, the second coolant passage hole disposed adjacent to the second oil passage hole in the second direction;
• a first boss portion surrounding the first oil passage hole;
• and
• a second boss portion surrounding the first coolant passage hole;
• wherein:
• the first boss portion includes a first edge portion facing toward a center of the respective core plate, the first edge portion oriented obliquely to the first direction and to the second direction such that a first distance from the first edge portion to a centerline of the respective core plate increases as the first edge portion extends toward the first coolant passage hole;
• and
• the second boss portion includes a second edge portion facing toward the center of the respective core plate, the second edge portion oriented obliquely to the first direction and to the second direction such that a second distance from the second edge portion to the centerline of the respective core plate increases as the second edge portion extends toward the first oil passage hole;
• wherein the plurality of oil flow paths fluidically communicate with one another via the pair of oil passage holes of the plurality of core plates;
• and
• wherein the plurality of coolant flow paths fluidically communicate with one another via the pair of coolant passage holes of the plurality of core plates.