Fuel tank ventilation structure

Abstract

The utility model relates to the technical field of oil tanks, in particular to an oil tank ventilation structure which comprises a tank body and a cap in a cylindrical shape, an oil storage cavity used for storing fuel oil is arranged in the tank body, and an air outlet communicated with the oil storage cavity in the tank body is formed in the upper end face of the tank body. An oil return table is formed on the upper end face of the box body and protrudes along the edge of the air outlet, the upper end face of the oil return table is concave downwards to form an inverted-truncated-cone-shaped oil return groove communicated with the air outlet, a breather pipe is connected to the side face of the cap, and the cap is arranged outside the oil return table in a sleeving mode, covers the oil return table and seals the oil return table. Wherein the ventilation pipe is provided with a ventilation hole capable of communicating the inside and the outside of the box body. Therefore, the problem that oil is easy to accumulate in the cap is effectively solved, fuel oil is prevented from entering the breather pipe, and the service life of the carbon tube is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil tanks and relates to an oil tank ventilation structure. Background Art

[0002] The third phase of the national motor vehicle pollutant emission standard is referred to as the National III standard. Current regulations after the National III standard require that the fuel tank cap be fully sealed. Since the evaporation of fuel in the fuel tank itself requires air pressure balance, a ventilation structure is provided on the fuel tank, and a dump valve is connected below the ventilation structure. The dump valve is used to supply air and maintain the air passage in a normal state. When dumping occurs, the dump valve can be sealed in time to prevent fuel leakage. Most of the fuel tank ventilation structures on the market are directly connected to the fuel tank with a hard pipe or a tank-type cap outlet structure.

[0003] The method of directly connecting the air outlet with a hard pipe will cause fuel to spray out directly under severe vibration during riding, during which time the dump valve will not work, thus affecting the service life of the carbon tube; the tank-type cap structure can prevent fuel from spraying out directly, but oil is prone to accumulate in the cap. Utility Model Content

[0004] The utility model aims to solve the above problems in the prior art and proposes an oil tank ventilation structure, which adds an oil return structure inside the tank-type cap and at the air outlet to solve the problem of oil accumulation.

[0005] The purpose of the utility model can be achieved through the following technical solutions: a fuel tank ventilation structure, including a box body and a cap in the shape of a cover tube, the box body has an oil storage cavity for storing fuel inside, the upper end surface of the box body is provided with an air outlet connected to the internal oil storage cavity, the upper end surface of the box body and along the edge of the air outlet are protruded to form an oil return platform, the upper end surface of the oil return platform is concave to form an inverted frustum-shaped oil return groove connected to the air outlet, the side of the cap is connected to a ventilation pipe, the cap is sleeved outside the oil return platform, the cover is arranged inside and sealed, wherein the ventilation pipe is provided with a ventilation hole that can pass through the inside of the box body with the outside.

[0006] Preferably, the inner top wall protrusion of the cap is in an arc shape.

[0007] Preferably, the inner wall of the cap is provided with a secondary oil return platform in the shape of an annular ring, and the central through hole of the secondary oil return platform is in a shape of contraction from top to bottom.

[0008] Preferably, the upper end surface of the box body is inclined toward its front end, and the rear end of the box body protrudes outward to form a balancing part connected with its upper end surface, and the air outlet is arranged on the upper end surface of the balancing part.

[0009] Preferably, the upper end of the box body is inclined at an angle of 2.5°-3.5° toward its front end.

[0010] Preferably, fixing plates are symmetrically arranged on both sides of the upper end surface of the box body, and fixing grooves are arranged on the fixing plates.

[0011] Compared with the prior art, the utility model has the following advantages:

[0012] 1. Adding oil return structure inside the cap and at the air outlet effectively solves the problem of oil accumulation inside the cap;

[0013] 2. The fuel tank structure is stable and the exhaust pipe is reasonably arranged to prevent fuel from entering the ventilation pipe and affecting the service life of the carbon tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is an axonometric schematic diagram of the overall structure of the utility model.

[0015] Figure 2 It is a schematic diagram of the side elevation structure of the utility model.

[0016] Figure 3 It is a schematic diagram of the cross-sectional structure of the utility model.

[0017] Figure 4 It is a schematic diagram of the cap structure.

[0018] In the figure, 1. box body; 11. oil storage chamber; 12. air outlet; 13. balance part; 14. fixing plate; 141. fixing groove; 2. cap; 21. vent pipe; 22. vent hole; 3. oil return platform; 31. oil return groove; 4. secondary oil return platform. DETAILED DESCRIPTION

[0019] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0020] like Figure 1-Figure 3 As shown, a fuel tank ventilation structure comprises a tank body 1 and a cap 2 in the shape of a cover tube, the tank body 1 has an oil storage cavity 11 for storing fuel inside, the upper end surface of the tank body 1 is provided with an air outlet 12 connected to the oil storage cavity 11 inside, an oil return platform 3 is formed on the upper end surface of the tank body 1 and protrudes along the edge of the air outlet 12, the upper end surface of the oil return platform 3 is concave to form an oil return groove 31 in the shape of an inverted truncated cone and connected to the air outlet 12, a ventilation pipe 21 is connected to the side of the cap 2, the cap 2 is sleeved outside the oil return platform 3 to cover it inside and seal it, wherein the ventilation pipe 21 is provided with a ventilation hole 22 that can pass through the inside of the tank body 1 with the outside.

[0021] In this embodiment, when vibration occurs during riding and fuel enters the cap 2, the fuel has a certain viscosity. After the fuel is affected by external force and its own gravity, the internal relative movement generates resistance, which is a manifestation of the internal friction of the fuel, causing the fuel to gather and flow back to the box 1 through the oil return platform 3.

[0022] Installation process: The box body 1 is generally made of iron, aluminum alloy or engineering plastic. Through the hot melt welding process, the aluminum block is heated to melt the plastic, so that the inner wall of the cap 2 and the outer wall of the oil return platform 3 are adhered and fixed, and the lower end surface of the cap 2 and the upper end surface of the box body 1 are adhered and fixed.

[0023] The upper end surface of the box body 1 is symmetrically provided with fixing plates 14, and the fixing plates 14 are provided with fixing grooves 141. The oil tank of a two-wheeled motorcycle is generally located in the middle of the frame, and the upper end surface of the box body 1 is symmetrically provided with fixing plates 14 on both sides for fixing connection with the frame, so that the forces on both sides of the box body 1 are balanced, thereby ensuring the stability of the overall structure of the oil tank.

[0024] The inner top wall of the cap 2 is convex in an arc shape, and when a bicycle vibrates violently during riding, the fuel is not easily adhered to the inner top wall of the cap 2 .

[0025] Furthermore, if Figure 4 As shown, the inner wall of the cap 2 is provided with a ring-shaped secondary oil return platform 4, which can prevent the fuel from entering the vent hole 22, and has the function of guiding the airflow of the vent hole 22 to the air outlet 12, and at the same time prevents the fuel from turning up along the inner wall of the cap 2. The central through hole of the secondary oil return platform 4 is contracted from top to bottom, which is used to guide the fuel located above the secondary oil return platform 4 to flow back to the air outlet 12 back to the box body 1, so as to prevent oil accumulation in the cap 2.

[0026] The upper end surface of the box body 1 is inclined toward its front end side, and the rear end of the box body 1 protrudes outward to form a balancing part 13 connected with its upper end surface. The air outlet 12 is arranged on the upper end surface of the balancing part 13, so that the fuel in the oil storage cavity 11 is not easy to enter the balancing part 13 under severe vibration, and the fuel is not easy to adhere to the top of the inner wall of the oil storage cavity 11 after flowing back to the oil storage cavity 11 from the cap 2, thereby ensuring sufficient evaporation of the fuel and balanced air pressure in the oil storage cavity 11.

[0027] The upper end surface of the box body 1 is inclined at an angle of 2.5°-3.5° toward the front end thereof.

[0028] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A fuel tank ventilation structure, comprising a tank body (1) and a cap (2) in the shape of a cover tube, wherein the tank body (1) has an oil storage cavity (11) for storing fuel, characterized in that: The upper end surface of the box body (1) is provided with an air outlet (12) connected to the oil storage chamber (11) inside the box body; an oil return platform (3) is formed on the upper end surface of the box body (1) and protrudes along the edge of the air outlet (12); the upper end surface of the oil return platform (3) is concave to form an oil return groove (31) in the shape of an inverted truncated cone and connected to the air outlet (12); a vent pipe (21) is connected to the side of the cap (2); the cap (2) is sleeved outside the oil return platform (3) to cover it and seal it; the vent pipe (21) is provided with an air outlet (22) that can pass through the inside and outside of the box body (1).

2. The fuel tank ventilation structure according to claim 1, characterized in that: The inner top wall of the cap (2) is convex and has an arc shape.

3. The fuel tank ventilation structure according to claim 1, characterized in that: The inner wall of the cap (2) is provided with a secondary oil return platform (4) in the shape of an annular ring, and the central through hole of the secondary oil return platform (4) is in a shape of contraction from top to bottom.

4. The fuel tank ventilation structure according to claim 1, characterized in that: The upper end surface of the box body (1) is inclined toward its front end, and the rear end of the box body (1) protrudes outward to form a balancing portion (13) connected to its upper end surface, and the air outlet (12) is arranged on the upper end surface of the balancing portion (13).

5. The oil tank ventilation structure according to claim 4, characterized in that: The upper end surface of the box body (1) is inclined at an angle of 2.5°-3.5° toward the front end thereof.

6. The fuel tank ventilation structure according to claim 1, characterized in that: The upper end surface of the box body (1) is symmetrically provided with fixing plates (14), and the fixing plates (14) are provided with fixing grooves (141).

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