Engine exterior body
To provide an exterior body to attach to an engine body, where the exterior body is not limited to where it may be installed, is safe and has excellent dust proofing capability. An engine exterior body ( 2 ) is provided with a frame body ( 20 ) configured to attach to an engine body ( 1 ); a shaft part ( 21 ) projecting from the surface of the frame body ( 20 ); and a rotator body ( 22 ) including a hole part ( 22 a ) loosely fitted and retained on the shaft part ( 21 ). The rotator body ( 22 ) rotates about the shaft part ( 21 ) by way of the vibrations transmitted to the shaft part ( 21 ) when engine body operates without receiving power from the engine body ( 1 ).
1. An engine exterior body comprising:
a frame body configured to attach to an engine body;
a shaft part configured to project from a surface of the frame body; and
a rotator body including a hole part loosely fitted and retained on the shaft part, an inner diameter of the hole part sized relative to an outer diameter of the shaft part such that only a portion of the inner diameter of the hole part engages the outer diameter of the shaft part at any point in time, the rotator body rotating about the shaft part due to vibrations transmitted to the shaft part-when the engine body operates and without receiving power transmission from the engine body
wherein the hole part is balanced in relation to the rotator body, the rotator body is axially supported by the shaft part so that a rear side of the rotator body does not rest on the surface of the frame body, and the shaft part strikes a part of an inner surface of the hole part causing the rotator body to rotate.
2. The engine exterior body according to claim 1 , wherein the frame body is a cover that includes a cooling air intake which the engine body-equips; and the rotator body rotates along a surface of the cooling air intake of the cover.
3. The engine exterior body according to claim 1 , wherein the rotator body is an oblong member with the hole part provided at the center.
4. The engine exterior body according to claim 1 , wherein the rotator body is formed from high thermal conductivity material.
5. The engine exterior body according to claim 1 , wherein a ratio of an inside diameter dimension of the hole part to an outside diameter dimension of the shaft part is 1.10 to 1.20.
6. The engine exterior body according to claim 1 , wherein a side face of the rotator body facing a rotating direction is a slant face or a curved face along the rotating direction.