Internal combustion engine and water outlet structure of internal combustion engine

摘要

A water outlet structure of an internal combustion engine includes a water outlet and a thermostat. The water outlet includes a cooling-water inflow portion, a radiator outflow passage, and a bypass passage. The cooling-water inflow portion is provided to face a cooling-water outlet of a cylinder head. Cooling water is to flow out to a radiator through the radiator outflow passage. The radiator outflow passage linearly extends from the cooling-water inflow portion. The bypass passage linearly and obliquely extends from the cooling-water inflow portion to provide a water flow at an acute angle to a water flow in the radiator outflow passage. The thermostat is provided integrally with the water outlet and includes a thermo housing provided downstream of the bypass passage.

主权项

1. A water outlet structure of an internal combustion engine, comprising:
a water outlet provided to be attached to a cooling-water outlet provided at an end of a cylinder head of the internal combustion engine in a cylinder arrangement direction of the internal combustion engine, the water outlet comprising:
a cooling-water inflow portion provided to face the cooling-water outlet of the cylinder head;an attachment face configured to be in contact with the cooling-water outlet;a radiator outflow passage through which cooling water is to flow out to a radiator, the radiator outflow passage linearly extending from the cooling-water inflow portion in a first direction forming an acute angle to the attachment face when viewed from above the water outlet; anda bypass passage linearly extending from the cooling-water inflow portion in a second direction to provide a water flow at an acute angle to a water flow in the radiator outflow passage when viewed from above the water outlet, the second direction being defined along the attachment face and oblique relative to the first direction when viewed from a third direction perpendicular to the attachment face; and a thermostat provided integrally with the water outlet and including a thermo housing provided downstream of the bypass passage, wherein the bypass passage is provided sandwiched between the cylinder head and the radiator outflow passage when viewed from above the water outlet, wherein the first direction is substantially parallel to a horizontal plane, and wherein the second direction forms an acute angle to the first direction when viewed from the third direction.