The present utility model discloses a universal gasoline engine fuel tank cover including an outer shell, an inner shell and a sealing cover located on the upper surface of the inner shell, wherein the outer shell and the inner shell are connected through a ratchet mechanism and a limiting mechanism
The present utility model discloses a universal gasoline engine fuel tank cover including an outer shell, an inner shell and a sealing cover located on the upper surface of the inner shell, wherein the outer shell and the inner shell are connected through a ratchet mechanism and a limiting mechanism, the inner shell having a partition I and a partition II disposed in its upper cavity to divide the upper cavity into a first adsorption chamber, a second adsorption chamber and a third adsorption chamber, the first adsorption chamber and the second adsorption chamber having fine carbon particles disposed therein, the third adsorption chamber having a cylindrical foam disposed therein, the bottom of the partition I being disposed with an air hole I connecting the third adsorption chamber to the fuel tank, and the bottom of the first adsorption chamber being disposed with an air hole II causing the first adsorption chamber to be connected to the atmosphere outside. The present utility model is advantageous in that it has a delicate structural design, it is easy to assemble, its cost is low, it can effectively prevent direct exhaust of volatilized gasoline into the atmosphere, and accurate judgment can be made as to whether the fuel tank cover is adequately tightened.
대표청구항▼
1. A universal gasoline engine fuel tank cover, comprising an outer shell, an inner shell and a sealing cover located on the upper surface of the inner shell, characterized in that the outer shell and the inner shell are connected through a ratchet mechanism and a limiting mechanism, the inner shell
1. A universal gasoline engine fuel tank cover, comprising an outer shell, an inner shell and a sealing cover located on the upper surface of the inner shell, characterized in that the outer shell and the inner shell are connected through a ratchet mechanism and a limiting mechanism, the inner shell having a partition I and a partition II disposed in its upper cavity to divide the upper cavity inwardly into a first adsorption chamber, a second adsorption chamber and a third adsorption chamber, the first adsorption chamber and the second adsorption chamber having fine carbon particles disposed therein, the third adsorption chamber having a cylindrical foam disposed therein, the bottom of the partition I being disposed with an air hole I connecting the third adsorption chamber to the fuel tank, and the bottom of the first adsorption chamber being disposed with an air hole II causing the first adsorption chamber to be connected to the atmosphere outside. 2. A universal gasoline engine fuel tank cover as defined in claim 1, characterized in that the second adsorption chamber has an under prop cover disposed therein, the under prop cover having the partition II sheathed in the inner cavity thereof, the under prop cover having a convex platform disposed with a plurality of evenly distributed grids circumferentially around the bottom surface thereof, the grids having an inner height lower than its outer height, and each of the plurality of grids being disposed with an air inlet hole. 3. A universal gasoline engine fuel tank cover as defined in claim 2, characterized in that the first adsorption chamber and the second adsorption chamber are disposed with a ventilation cushion I and a ventilation cushion II respectively, the ventilation cushion I being located at the bottom of the first adsorption chamber, and the ventilation cushion II being sheathed onto the convex platform of the under prop cover. 4. A universal gasoline engine fuel tank cover as defined in claim 1, characterized in that the ratchet mechanism comprises a plurality of internal ratchet teeth disposed on the inner wall of the outer shell and a plurality of external ratchet teeth disposed on the outer wall of the inner shell and matching the plurality of internal ratchet teeth, the engagement surface between the external ratchet teeth and the internal ratchet teeth in the tightening direction being inclined and the engagement surface therebetween in the untightening direction being perpendicular, and the external ratchet teeth being involute-shaped, i.e. the distance between the gear root and the inner wall of the outer shell along the gear root-gear rack direction being gradually reduced. 5. A universal gasoline engine fuel tank cover as defined in claim 4, characterized in that the limiting mechanism comprises an inward-projecting raised surface disposed integrally with the outer shell in the middle portion thereof, a limiting circumference disposed at the lower part of the outer wall of the inner shell and limiting convex platforms disposed on the inner wall of the outer shell, the limiting circumference being located on the upper side of the limiting convex platform, and the external ratchet teeth and the internal ratchet teeth being located on the lower side of the raised surface. 6. A universal gasoline engine fuel tank cover as defined in claim 5, characterized in that the number of the limiting convex platforms is above two and they are evenly distributed along the circumference of the inner wall of the outer shell. 7. A universal gasoline engine fuel tank cover as defined in claim 6, characterized in that the internal ratchet teeth are in contact with the distal ends of the cantilever arms of the external ratchet teeth, and a small clearance exists between the outer circumferential surface of the limiting circumference of the inner shell and the inner wall of the outer shell. 8. A universal gasoline engine fuel tank cover as defined in claim 7, characterized in that the first adsorption chamber is disposed with support ribs at the bottom thereof, and the ventilation cushion I is located on the support ribs. 9. A universal gasoline engine fuel tank cover as defined in claim 8, characterized in that the outer shell is disposed with projected ribs on the inner wall thereof to ensure connection between the air hole II and the atmosphere. 10. A universal gasoline engine fuel tank cover as defined in claim 9, characterized in that a foam cover is disposed between the fine carbon particles and the lower surface of the sealing cover.
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