A fuel vent valve is not shut improperly by the flow of fuel vapor. The fuel vent valve also prevents fuel from spilling out from filler neck during filling of a fuel tank. The fuel vent valve includes a casing having a vent space, a float and a vent device which can be moved up and down. The vent
A fuel vent valve is not shut improperly by the flow of fuel vapor. The fuel vent valve also prevents fuel from spilling out from filler neck during filling of a fuel tank. The fuel vent valve includes a casing having a vent space, a float and a vent device which can be moved up and down. The vent device includes an upper valve member, which shuts and opens a communication passage. The upper valve member is located above the float. A breathing hole and an outer wall of the valve device form a restricted passage. When the fuel level reaches a first predetermined level and the valve device rises, the restricted passage increases the flow resistance to restrict the flow of fuel vapor from the communication passage to the outside of the fuel tank. When fuel level reaches a second predetermined level and the valve device rises further, the upper valve member closes the communication passage.
대표청구항▼
The invention claimed is: 1. A fuel vent valve formed at an upper portion of a fuel tank for permitting and cutting off communication between an inside and an outside of the fuel tank, comprising: a casing having a vent space for connecting the inside and outside of the fuel tank; a communication p
The invention claimed is: 1. A fuel vent valve formed at an upper portion of a fuel tank for permitting and cutting off communication between an inside and an outside of the fuel tank, comprising: a casing having a vent space for connecting the inside and outside of the fuel tank; a communication passage formed on an upper portion of the casing, wherein the communication passage communicates an inside of the vent space with an outside of the vent space; a valve device having a float, which is in the vent space and rises and falls in response to the fuel level in the fuel tank, wherein the valve device includes an upper valve member, which is allowed to move up and down above an upper portion of the float, and the upper valve member shuts and opens the communication passage, wherein the upper valve member shuts the communication passage when the fuel level reaches a certain level; a regulated passage formed by a breathing hole and the valve device, wherein the breathing hole connects the inside of the fuel tank with the communication passage, and wherein the regulated passage varies the flow resistance of fuel vapor between the fuel tank and the communication passage to reduce the fuel vapor flow to the outside of the fuel tank when the fuel level reaches a predetermined level; a supporting protrusion extended toward the vent space from the upper portion of the casing; a valve supporter formed at the lower end of the supporting protrusion; wherein the breathing hole is formed on the outer wall of the supporting protrusion, and the valve supporter supports the upper valve member; and a communication hole formed in the casing, wherein the communication hole communicates the fuel tank with the vent space. 2. A fuel vent valve according to claim 1, wherein the upper valve member includes a flow passage that is smaller than the communication passage of the casing, and the flow passage connects the communication passage with the vent space, and wherein the float includes a valve portion, which contacts the upper valve member to open and close the flow passage. 3. A fuel vent valve according to claim 1, wherein the breathing hole is formed in an outer wall of the supporting protrusion at the same level as or above an upper surface of the upper valve member when the valve device is not floating, wherein the breathing hole connects the inside of the fuel tank with the communication passage. 4. A fuel vent valve according to claim 1, wherein the upper valve member is supported by the upper portion of the float, and wherein the upper portion of the float pushes the upper valve member upward when the float is floating. 5. A fuel vent valve according to claim 1, wherein a side wall of the upper valve member is located a predetermined distance from the breathing hole to restrict the breathing hole when the upper valve member rises. 6. A fuel vent valve according to claim 5, further comprising guide fins formed on the periphery of the upper valve member to maintain the predetermined distance between the upper valve member and the breathing hole. 7. A fuel vent valve formed at an upper portion of a fuel tank for permitting and cutting off communication between an inside and an outside of the fuel tank, comprising: a casing having a vent space for connecting the inside and outside of the fuel tank; a communication passage formed on an upper portion of the casing, wherein the communication passage communicates an inside of the vent space with an outside of the vent space; a valve device having a float, which is in the vent space and rises and falls in response to the fuel level in the fuel tank, wherein the valve device includes an upper valve member, which is allowed to move up and down above an upper portion of the float, and the upper valve member shuts and opens the communication passage, wherein the upper valve member shuts the communication passage when the fuel level reaches a certain level; and a regulated passage formed by a breathing hole and the upper valve member, wherein the breathing hole connects the inside of the fuel tank with the communication passage, and wherein the regulated passage varies the flow resistance of fuel vapor between the fuel tank and the communication passage to reduce the fuel vapor flow to the outside of the fuel tank when the fuel level reaches a predetermined level, wherein the upper valve member restricts the breathing hole to regulate the fuel vapor flow when the upper valve member rises. 8. A fuel vent valve according to claim 7, wherein the upper valve member includes a flow passage that is smaller than the communication passage of the casing, wherein the flow passage connects the communication passage with the vent space, and the float includes a valve portion, which contacts the upper valve member to open and close the flow passage. 9. A fuel vent valve according to claim 7, wherein the breathing hole is formed in an outer wall of the casing at the same level as or above an upper surface of the upper valve member when the valve device is not floating, wherein the breathing hole connects the inside of the fuel tank with the communication passage. 10. A fuel vent valve according to claim 7, wherein the upper valve member is supported by the upper portion of the float, and wherein the upper portion of the float pushes the upper valve member upward when the float is floating. 11. A fuel vent valve according to claim 7, further comprising guide fins formed on the outer periphery of the upper valve member to maintain the predetermined distance between the upper valve member and the breathing hole. 12. A fuel vent valve formed at an upper portion of a fuel tank for permitting and cutting off communication between an inside and an outside of the fuel tank, comprising: a casing having a vent space for connecting the inside and outside of the fuel tank; a communication passage formed on an upper portion of the casing, wherein the communication passage communicates an inside of the vent space with an outside of the vent space; a valve device having a float, which is in the vent space and rises and falls in response to the fuel level in the fuel tank, wherein the valve device includes an upper valve member, which is allowed to move up and down above an upper portion of the float, and the upper valve member shuts and opens the communication passage, wherein the upper valve member shuts the communication passage when the fuel level reaches a certain level; and a regulated passage formed by a breathing hole and the float, wherein the breathing hole connects the inside of the fuel tank with the communication passage, and wherein the regulated passage varies the flow resistance of fuel vapor between the fuel tank and the communication passage to reduce the fuel vapor flow to the outside of the fuel tank when the fuel level reaches a predetermined level, wherein the float restricts the breathing hole to regulate fuel vapor flow when the float rises. 13. A fuel vent valve according to claim 12, wherein the upper valve member includes a flow passage that is smaller than the communication passage of the casing, and the flow passage connects the communication passage with the vent space, and wherein the float includes a valve portion, which contacts the upper valve member to open and close the flow passage. 14. A fuel vent valve according to claim 12, wherein the breathing hole is formed in an outer wall of the casing at the same level as or above an upper surface of the float when the valve device is not floating, wherein the breathing hole connects the inside of the fuel tank with the communication passage. 15. A fuel vent valve according to claim 12, wherein the upper valve member is supported by the upper portion of the float, and wherein the upper portion of the float pushes the upper valve member upward when the float is floating. 16. A fuel vent valve according to claim 12, further comprising guide fins formed on the outer periphery of the float to maintain the predetermined distance between the float and the breathing hole.
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이 특허에 인용된 특허 (8)
Miyoshi,Keiji; Yamada,Norihiro; Yoshida,Keisuke; Aoki,Tomohide, Apparatus for inhibiting fuel from flowing out of fuel tanks.
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