Air-cooled V-type combustion engine

An air-cooled V-type combustion engine comprising:

• at least first and second engine cylinders positioned on leading and trailing sides with respect to a direction of rotation of a cooling fan assembly, respectively;
• a fan casing accommodating therein the cooling fan assembly, which is drivingly coupled with a rotary shaft of the combustion engine and operable to induce a cooling air for cooling the first and second engine cylinders;
• and
• a guide body for dividing the cooling air discharged from the cooling fan assembly, into first and second separate cooling air streams to cool the first and second engine cylinders, respectively:
• wherein the guide body comprises:
• an upright wall positioned on an inner surface of the fan casing and protruding in a direction parallel to an axis of rotation of the cooling fan assembly and extending radially outwardly and spirally from a trailing side towards a leading side with respect to the direction of rotation of the cooling fan assembly;
• and
• a ceiling wall connected with a projecting end of the upright wall and extending spirally inwardly so as to guide the first cooling air stream, then flowing inside of spirality of the upright wall, towards the first engine cylinder, while forming a cooling air passage between the inner surface of the fan casing and an outer surface of the guide body to provide the second cooling air stream through the second engine cylinder;
• wherein the guide body progressively directs a greater volume of air into first cooling air stream as the guide body upright wall extends radially outward and spirally away from the rotary shaft of the combustion engine.

An air-cooled V-type combustion engine comprising:

• at least first and second engine cylinders positioned on leading and trailing sides with respect to a direction of rotation of a cooling fan assembly, respectively, the cooling fan assembly including a plurality of rotary vanes and a screen member mounted above the rotary vanes to prevent debris larger than screen perforations from entering and contacting the rotary vanes, wherein the screen member rotates with the rotary vanes;
• a fan casing accommodating therein the cooling fan assembly, which is drivingly coupled with a rotary shaft of the combustion engine and operable to suck air into the fan casing through the screen member and to induce a cooling air for cooling the first and second engine cylinders;
• and
• a guide body for dividing the cooling air discharged from the cooling fan assembly, into first and second separate cooling air streams to cool the first and second engine cylinders, respectively;
• wherein the guide body comprises:
• an upright wall positioned on an inner surface of the fan casing and protruding in a direction parallel to an axis of rotation of the cooling fan assembly and extending radially outwardly and spirally from a trailing side towards a leading side with respect to the direction of rotation of the cooling fan assembly;
• and
• a ceiling wall connected with a projecting end of the upright wall and extending spirally inwardly so as to guide the first cooling air stream, then flowing inside of spirality of the upright wall, towards the first engine cylinder, while forming a cooling air passage between the inner surface of the fan casing and an outer surface of the guide body to provide the second cooling air stream through the second engine cylinder.