Fuel cap

Abstract

It prevents water from entering the air intake. [Solution] The fuel cap 40 closes the opening 11 of the fuel inlet pipe 10, which has an air intake port 22 of the air filter case 20 on its outer circumference. When the fuel cap 40 is installed on the opening 11, it covers the air intake port 22 and has a flange 41 that is spaced apart from the outer surface of the air filter case 20 at the air intake port 22.

Description

Technical Field

[0004] , , ,

[0005] , , , , , ,

[0006] , , ,

[0001] The present invention relates to a fuel cap.

Background Art

[0002] Various structures for suppressing the intrusion of water into the air filter case have been proposed. For example, the air filter case described in Patent Document 1 suppresses the intrusion of water into the intake port by making the intake port have a labyrinth structure.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, an intake port of an air filter case connected to a canister of a fuel vapor treatment device may be provided on the outer peripheral side of a fuel inlet pipe connected to a fuel tank of a vehicle. Here, when water scatters from the fuel cap side closing the opening of the fuel inlet pipe toward the intake port during car washing or the like, there is a risk that the water may enter the intake port.

Means for Solving the Problems

[0005] The fuel cap for solving the above problems is a fuel cap that closes an opening of a fuel inlet pipe on the outer peripheral side of which an intake port of an air filter case is provided. In a state of being attached to the opening, this fuel cap has a flange that covers the intake port and is separated from the outer peripheral surface of the air filter case at the intake port.

Effects of the Invention

[0006] This fuel cap can prevent water from entering the air intake. [Brief explanation of the drawing]

[0007] [Figure 1] Figure 1 is a cross-sectional view showing the vicinity of the opening of a fuel inlet pipe when it is assembled to a vehicle in one embodiment. [Modes for carrying out the invention]

[0008] The following describes one embodiment of the fuel cap. <Configuration near the opening of the fuel inlet pipe> As shown in Figure 1, an air intake port 22 of a cylindrical air filter case 20 is provided on the outer circumference of the fuel inlet pipe 10 connected to the vehicle's fuel tank.

[0009] The end of the fuel inlet pipe 10 is an opening 11. The opening 11 is closed by a removable fuel cap 40. A flange 41 is provided around the entire circumference of the outer edge of the fuel cap 40.

[0010] The flange 41 covers the intake port 22 when the fuel cap 40 is installed in the opening 11, and is spaced apart from the outer surface of the air filter case 20 at the intake port 22. Therefore, a gap K is formed between the flange 41 and the outer surface of the air filter case 20. The size of this gap K is set in advance so that the pressure loss when introducing outside air from the intake port 22 to the canister 80 (described later) is below a predetermined allowable value.

[0011] The air intake port 22 of the air filter case 20 is connected to the atmospheric passage 60 via a filter 50 provided in the air filter case 20. The air passage 60 is connected to the air inlet of the canister 80, which is part of the vehicle's fuel vapor treatment system.

[0012] In some cases, electrical components 70, such as modules that operate when detecting leaks in the fuel vapor treatment device, may be provided in the middle of the atmospheric passage 60. <Operation and Effects of This Embodiment> (1) As shown in Figure 1, when the fuel cap 40 is attached to the opening 11, the intake port 22 is covered by the flange 41 of the fuel cap 40. Therefore, it is difficult for water W that has been scattered from the fuel cap 40 towards the intake port 22 to enter the intake port 22. Thus, the entry of water W into the intake port 22 can be suppressed.

[0013] (2) As shown in Figure 1, when the fuel cap 40 is installed in the opening 11, the flange 41 of the fuel cap 40 is spaced apart from the outer surface of the air filter case 20 at the intake port 22. Therefore, the gap K is formed between the flange 41 and the outer surface of the air filter case 20, and outside air flows into the intake port 22 through this gap K. As a result, outside air can be introduced from the intake port 22 toward the canister 80.

[0014] (3) Since the intrusion of water into the air intake port 22 is suppressed, water exposure to the electrical components 70 located downstream of the air intake port 22 is reduced. Therefore, damage to the electrical components 70 due to water exposure can be reduced.

[0015] (4) The above-mentioned effects can be obtained simply by changing the shape of the fuel cap 40. Therefore, there is no need to change the shape of the air filter case 20, etc., and no additional parts are required.

[0016] (5) If a conventional labyrinth structure is used to block water from entering the air intake, the following problems may occur, for example: The structure of the air intake may become complicated. Also, some water may enter and accumulate near the entrance of the air intake. In this respect, the air intake structure of this embodiment can suppress the occurrence of such problems.

[0017] <Example of changes> In addition, this embodiment can be implemented with the following modifications. This embodiment and the following modification examples can be combined and implemented with each other within a technically non - conflicting range.

[0018] · A flange 41 is provided over the entire outer circumference of the outer edge of the fuel cap 40. Alternatively, the flange 41 may be provided only at a part of the outer edge of the fuel cap 40 that is effective in suppressing the intrusion of water into the intake port 22.

[0019] · The member provided downstream of the intake port 22 can be appropriately changed.

Explanation of Reference Numerals

[0020] 10…Fuel inlet pipe 11…Opening 20…Air filter case 22…Intake port 40…Fuel cap 41…Flange 5,…Filter 60…Atmospheric passage 70…Electrical component 80…Canister

Claims

[Claim 1] A fuel cap that closes the opening of a fuel inlet pipe, the intake port of an air filter case, which is located on the outer circumference, When installed in the aforementioned opening, it has a flange that covers the intake port and is spaced apart from the outer circumferential surface of the air filter case at the intake port. Fuel cap.

Images