A fuel cap includes a communication chamber configured to make a charge path and the inside of the fuel tank communicate with each other while in a closed state. The communication chamber includes: a positive pressure control valve configured to open, and send evaporated fuel, which occurs inside th
A fuel cap includes a communication chamber configured to make a charge path and the inside of the fuel tank communicate with each other while in a closed state. The communication chamber includes: a positive pressure control valve configured to open, and send evaporated fuel, which occurs inside the fuel tank, to an evaporated fuel reservoir via the communication chamber and the charge path when the internal pressure of the fuel tank becomes equal to or greater than a predetermined pressure; and a negative pressure control valve configured to open, and send air from the evaporated fuel reservoir to the fuel tank via the communication chamber and the charge path when the internal pressure of the fuel tank becomes equal to or less than the predetermined pressure. In addition, a key cylinder sets the negative pressure control valve open upon inserting a key into the key cylinder.
대표청구항▼
1. An evaporated fuel handling apparatus for a vehicle, comprising: a fuel tank to reserve fuel;a fuel cap attached to a fuel filler port of the fuel tank configured to open and close the fuel filler port by manipulation with a key inserted in a key cylinder;an evaporated fuel reservoir to reserve e
1. An evaporated fuel handling apparatus for a vehicle, comprising: a fuel tank to reserve fuel;a fuel cap attached to a fuel filler port of the fuel tank configured to open and close the fuel filler port by manipulation with a key inserted in a key cylinder;an evaporated fuel reservoir to reserve evaporated fuel with adsorbent adsorbing the evaporated fuel;a charge path facilitating communication between the fuel tank and the evaporated fuel reservoir; anda purge path facilitating communication between the evaporated fuel reservoir and an air intake system of an internal combustion engine, whereinthe fuel cap comprises a communication chamber which facilitates communication between the charge path and an inside of the fuel tank,the communication chamber comprises an on-off valve configured to open when an internal pressure of the fuel tank becomes equal to a predetermined pressure, thus facilitating communication between the fuel tank and the evaporated fuel reservoir, andthe on-off valve is set open by a linkage member linked to the manipulation of the key, and thus sends the evaporated fuel in the fuel tank to the evaporated fuel reservoir. 2. The evaporated fuel handling apparatus for a vehicle according to claim 1, wherein a pressure piece is provided between the key cylinder and the on-off valve, the pressure piece constituting the linkage member which is configured to open the on-off valve in conjunction with an action of inserting the key into the key cylinder and pressing down the key cylinder. 3. The evaporated fuel handling apparatus for a vehicle according to claim 2, wherein the on-off valve comprises: a positive pressure control valve configured to open, and send the evaporated fuel, which is inside the fuel tank, to the evaporated fuel reservoir via the communication chamber and the charge path, when the internal pressure of the fuel tank becomes equal to or greater than a predetermined pressure; anda negative pressure control valve configured to open, and send air from the evaporated fuel reservoir to the fuel tank via the communication chamber and the charge path, when the internal pressure of the fuel tank becomes equal to or less than the predetermined pressure, andthe pressure piece is provided to link with any one of the positive pressure control valve and the negative pressure control valve. 4. The evaporated fuel handling apparatus for a vehicle according to claim 3, wherein the key cylinder is provided in a cylinder chamber which is provided at or near a center of the fuel cap,the positive pressure control valve and the negative pressure control valve are arranged in parallel in a circumferential direction about the key cylinder, outside the key cylinder in the fuel cap in a radial direction,wherein a through-hole is formed between the cylinder chamber and the communication chamber housing the negative pressure control valve, andthe pressure piece penetrates through the through-hole, and connects the key cylinder and the negative pressure control valve by a sealing member. 5. The evaporated fuel handling apparatus for a vehicle according to claim 4, wherein a key manipulation waiting mechanism is provided inside the communication chamber comprising the positive pressure control valve or the negative pressure control valve, wherein the key manipulation waiting mechanism is configured to detect a difference between pressures inside and outside the fuel tank, and to prohibit manipulation of the key when the internal pressure of the fuel tank is equal to or greater than a predetermined pressure. 6. The evaporated fuel handling apparatus for a vehicle according to claim 1, wherein the key cylinder is provided with the linkage member configured to open the on-off valve in conjunction with a manipulation of turning the key. 7. The evaporated fuel handling apparatus for a vehicle according to claim 6, wherein the on-off valve comprises: a positive pressure control valve configured to open, and send the evaporated fuel, which occurs inside the fuel tank to the evaporated fuel reservoir via the communication chamber and the charge path, when the internal pressure of the fuel tank becomes equal to or greater than the predetermined pressure; anda negative pressure control valve configured to open, and send air from the evaporated fuel reservoir to the fuel tank via the communication chamber and the charge path, when the internal pressure of the fuel tank becomes equal to or less than the predetermined pressure,the key cylinder is provided in a cylinder chamber which is provided in or near the center of the fuel cap,the positive pressure control valve and the negative pressure control valve are arranged in parallel in a circumferential direction about the key cylinder, outside the key cylinder in the fuel cap in a radial direction,a through-hole is formed between the cylinder chamber and the communication chamber housing any one of the positive pressure control valve and the negative pressure control valve, and a helical engagement groove is formed in a side surface of the key cylinder,the linkage member is engaged at one end with the engagement groove, penetrates through the through-hole, and is connected at an opposite end to the positive pressure control valve or the negative pressure control valve, andthe positive pressure control valve or the negative pressure control valve is set open in conjunction with upward and downward movement of the linkage member, which is caused by a turning of the key cylinder. 8. The evaporated fuel handling apparatus for a vehicle according to claim 6, wherein the on-off valve comprises: a positive pressure control valve configured to open, and send the evaporated fuel, which is inside the fuel tank, to the evaporated fuel reservoir via the communication chamber and the charge path, when the internal pressure of the fuel tank becomes equal to or greater than the predetermined pressure; anda negative pressure control valve configured to open, and send air from the evaporated fuel reservoir to the fuel tank via the communication chamber and the charge path when the internal pressure of the fuel tank becomes equal to or less than the predetermined pressure,the key cylinder is provided in a cylinder chamber which is provided at or near the center of the fuel cap,the positive pressure control valve and the negative pressure control valve are arranged in parallel in a circumferential direction about the key cylinder, outside the key cylinder in the fuel cap in a radial direction,a through-hole is formed between the cylinder chamber and the communication chamber housing the positive pressure control valve or the negative pressure control valve, andthe linkage member is slidably provided in the through-hole; a cam, which turns in a circumferential direction of the key cylinder, is formed in the key cylinder; and the positive pressure control valve or the negative pressure control valve is set open when the linkage member comes into contact with the cam and thus slides in conjunction with turn of the key cylinder.
Uranishi Koji (Susono JPX) Ito Takaaki (Mishima JPX) Tanahashi Toshio (Susono JPX), Device for preventing fuel vapor from escaping to the outside air from a fuel tank.
Donahue,Ronald J.; Carpenter,Todd L.; Kirk,J. David; Hintz,Gregory C., Evaporative emissions control system including a charcoal canister for small internal combustion engines.
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