CN101886590B - Adsorber of fuel vapor of motorcycles - Google Patents

Abstract

This invention discloses a motorcycle oil vapor adsorption device. A fuel tank cap with a pressure balancing channel is installed inside the filler neck on top of the fuel tank. The fuel tank cap has an upper shell, internal components, and a lower shell. The internal components are housed in the lower shell. An air inlet for the pressure balancing channel is located at the bottom of the lower shell. The top of the lower shell has a flange. The upper shell is fastened to the flange on the top of the lower shell. The air outlet for the pressure balancing channel is located on the top wall of the upper shell. A connector is attached to this outlet, and the connector is connected to the inlet of the charcoal canister via an adsorption pipe. The outlet of the charcoal canister is connected to the carburetor via a desorption pipe. This invention can balance the pressure inside and outside the fuel tank, ensuring normal fuel supply to the carburetor via the fuel tank switch; it can also adsorb oil vapor, preventing oil vapor from being released into the atmosphere and polluting the environment, thus avoiding fuel waste. It features a reasonable design, easy implementation, reliable performance, low cost, and strong versatility.

Description

Motorcycle Oil Vapor Adsorption Device

technical field

The invention belongs to the technical field of motorcycles, and in particular relates to an oil vapor adsorption device on motorcycles.

Background technique

The motorcycle fuel tank cap is installed in the filler port on the top of the fuel tank to seal the filler port and collect oil and gas. As shown in Figure 5, the traditional fuel tank cap is composed of three parts: the fuel tank cap upper shell 2, the fuel tank cap lower shell 4 and the internal components 3, wherein the internal components 3 are installed in the fuel tank cap lower shell 4, and the fuel tank cap lower shell 4 The top has a flanging 4a, and the cross section of the flanging 4a is "∩" shape. The upper shell 2 of the fuel tank cap is fastened on the flanging 4a on the top of the lower shell 4 of the fuel tank cap, and the peripheral side wall of the upper shell 2 of the fuel tank cap It fits with the outer ring wall of the "∩"-shaped flange 4a of the lower shell of the fuel tank cover, and is limited by the curling at the bottom of the side wall of the upper shell of the fuel tank cover. In order to balance the pressure inside the fuel tank 1 and the outside, so that the fuel in the fuel tank can enter the carburetor smoothly through the fuel switch arranged at the bottom of the fuel tank, an air pressure balance passage 9 is arranged on the fuel tank cap, and the inlet of the air pressure balance passage 9 The air port is on the bottom surface of the lower shell 4 of the fuel tank cap, the air outlet 14 is on the inner ring wall of the "∩" shaped flange 4a of the lower shell of the fuel tank cap, and the air pressure balance channel 9 is equipped with an anti-roll valve 13 near the air inlet, The anti-roll valve 13 can ensure that gas passes through the air pressure balance channel 9 in both directions during normal driving, and can prevent fuel from flowing out from the air pressure balance channel 9 when the motorcycle tilts or falls down. Because the fuel in the fuel tank is volatile, the oil vapor will enter the air pressure balance channel under the action of the pressure difference, and enter the gap between the fuel tank cap and the filler wall from the air outlet 14 of the air pressure balance channel, and then enter the atmosphere, which will not only pollute the environment, but also It also causes waste of fuel.

In order to prevent and control the pollution of motorcycle pollutants to the environment and improve the ambient air quality, the Phase III standard for two-wheel and three-wheel motorcycles puts forward new requirements for the discharge of exhaust pollutants by the working condition method of two-wheel or three-wheel motorcycles. , in this case, the above-mentioned fuel tank cover just cannot meet the new requirements. In order to meet the National III standard, some manufacturers add oil vapor adsorption devices on motorcycles. As shown in Fig. 6 and Fig. 7 in conjunction with Fig. 5, the device blocks the air outlet 14 of the air pressure balance channel 9 of the fuel tank cap, and at the same time opens a hole at a suitable place on the top of the fuel tank 1, and the hole passes through the connection between the joint and the fuel evaporation pipe 16. One end is connected, after the anti-roll valve 15 is connected in series, the inlet of the carbon tank 6 is connected through the adsorption pipe 5, and the outlet of the carbon tank 6 is connected with the carburetor 8 through the desorption pipe 7. In the above structure, the structure of the fuel tank cover is slightly changed, so that the fuel tank cover only plays a role of sealing. On the one hand, the external atmosphere communicates with the fuel tank 1 through the carbon tank 6, the anti-roll valve 15 and the adsorption pipe 5, which can realize the function of balancing the internal and external pressure of the fuel tank; on the other hand, the oil vapor in the fuel tank 1 enters The carbon tank 6 enters the carburetor 8 after being absorbed by the carbon tank 6 for utilization. Although said device has reached certain anti-pollution effect, there are still following deficiencies:

1. The anti-roll valve outside the fuel tank needs to be processed separately, and it needs to be equipped with accessories such as hoops, which increases the production cost of the motorcycle.

2. The fuel tank structures of different models of motorcycles are also different. The above-mentioned scheme finds a point on the fuel tank to connect the adsorption pipe, which greatly changes the fuel tank structure, and the versatility of the fuel tank structures of different models is poor, thus increasing the transformation cost.

3. The anti-dump valve is outside the fuel tank, and the part connected to the fuel tank through the adsorption tube is located at the highest point of the fuel tank. Although it can prevent the fuel from splashing into the fuel evaporation tube, when the motorcycle tilts or falls, the fuel will flow into the anti-dumping valve. The adsorption pipe in front of the dump valve cannot flow back to the fuel tank, which will cause pipeline blockage. On the one hand, the function of absorbing oil vapor will be invalid; The oil supply is normal.

4. The fuel tank cap basically imitates the traditional structure. It is difficult to completely fit between the "∩" shaped flange of the lower shell of the fuel tank cap and the side wall of the upper shell of the fuel tank cap. There will be small gaps, and the oil vapor in the fuel tank can easily pass through the small gaps. Outward leakage still has the problems of environmental pollution and fuel waste, which cannot meet the requirements of the National III standard.

Contents of the invention

The technical problem to be solved by the present invention is to provide a motorcycle oil vapor adsorption device with reliable performance, low cost and convenient installation.

The technical scheme of the present invention is as follows: a motorcycle oil vapor adsorption device, including a fuel tank, a fuel tank cover, an adsorption tube, a carbon canister, a desorption tube and a carburetor, and the fuel tank cover with an air pressure balance channel is installed in the fuel tank top. , the fuel tank cap has a fuel tank cap upper shell, internal components and a fuel tank cap lower shell. The top of the tank has a "∩"-shaped flange, and the upper shell of the fuel tank cap is buckled on the flange of the top of the lower shell of the fuel tank cap. The key point is that the air outlet of the air pressure balance channel is set on the upper shell On the top wall of the gas outlet, a joint is installed at the gas outlet, the joint is connected to one end of the adsorption tube, the other end of the adsorption tube is connected to the inlet of the carbon tank, and the outlet of the carbon tank is connected to the carburetor through a desorption tube.

The present invention skillfully utilizes the air pressure balance channel on the existing fuel tank cover, so that the air outlet of the air pressure balance channel is connected with the inlet of the carbon tank through the pipeline, so that the inner cavity of the fuel tank, the air pressure balance channel, the adsorption tube, the carbon tank, and the desorption tube On the one hand, it can balance the pressure inside and outside the fuel tank to ensure that the fuel tank can supply oil to the carburetor normally through the fuel tank switch; on the other hand, the oil vapor in the fuel tank enters the air pressure balance channel and passes through the air pressure balance channel. The pipeline between the gas outlet and the carbon tank enters the carbon tank, and after being absorbed by the carbon tank, it enters the carburetor for use. When the motorcycle is running normally, the anti-dump valve in the air pressure balance channel allows the gas to pass through freely to balance the air pressure; when the motorcycle tilts or falls, the anti-dump valve closes the air passage, which not only prevents the The fuel enters the carburetor through the fuel switch, and it can prevent the fuel from flowing out of the air pressure balance channel, thereby avoiding the blockage of the pipeline in front of the carbon tank, and ensuring the reliable performance of balancing the internal and external pressure of the fuel tank and absorbing oil vapor. At the same time, the air pressure balance channel is equipped with an anti-dump valve, so there is no need to connect another anti-dump valve in series in the pipeline in front of the canister, which not only simplifies the pipeline, but also facilitates the layout of the pipeline, and effectively reduces the production cost.

A sealing rubber ring is provided between the top flange of the lower shell of the fuel tank cap and the inner top wall of the upper shell of the fuel tank cap to prevent the oil vapor in the air pressure balance channel from entering the "∩" shaped flange of the lower shell of the fuel tank cap and the fuel tank. Covering the small gap between the side walls around the shell effectively prevents oil vapor from escaping.

In order to further enhance the sealing effect, the top surface of the flange is a plane, and the plane is attached to the bottom surface of the sealing rubber ring, and the top surface of the sealing rubber ring is attached to the inner top wall of the upper shell of the fuel tank cap.

In order to simplify the mechanism, facilitate assembly, and facilitate pipeline connection, the joint is in a right-angle shape and is formed by connecting a vertical section and a horizontal section. The upper end of the vertical section and the horizontal section are transitioned through a circular arc.

A bushing is welded at the center of the inner top wall of the upper shell of the fuel tank cap, and a square bolt is arranged below the bushing, and the upper end of the square bolt extends into the bushing and is threadedly connected with the lower end of the joint vertical section, and The central hole of the square bolt communicates with the inner hole of the joint, and an annular groove is formed on the upper end of the vertical section of the joint, and a shaft retaining ring is installed in the annular groove, and the shaft retaining ring is positioned above the upper shell of the fuel tank cap. In the above structure, on the one hand, the square bolt plays the role of ventilation through its central hole; and reliability during use. At the same time, the joint fits with the upper shell of the fuel tank cover, and the joint can rotate circumferentially, so that the assembly direction of the joint can be adjusted according to the position and installation structure of the fuel tank of different models, and the state of the fuel tank cover is unified, which not only has strong versatility, but also reduces Difficulty in production management.

In order to enhance the sealing performance, an O-ring is arranged between the bush and the joint.

The beneficial effects of the present invention are:

1. Reasonable use of the structure of the existing fuel tank cover eliminates the need to equip special anti-roll valves, hoops and other accessories, which effectively reduces the production cost of motorcycles, and the cost of each motorcycle can be reduced by at least five yuan.

2. It is only necessary to slightly modify the fuel tank cap without modifying the structure of the fuel tank, the cost of modification is low, and the versatility is strong, and it can be used on various types of motorcycles.

3. It can effectively prevent pipeline blockage, not only has reliable performance of absorbing oil vapor, but also can ensure normal fuel supply from the fuel tank to the carburetor through the fuel switch.

4. The fuel tank cover is well sealed, which will not cause oil vapor leakage, avoid environmental pollution and fuel waste, and meet the requirements of the National III standard.

Description of drawings

Fig. 1 is the structural representation of embodiment 1.

FIG. 2 is a schematic structural view of the fuel tank cap in Embodiment 1. FIG.

Fig. 3 is a view taken along direction B of Fig. 2 .

FIG. 4 is a schematic structural view of Embodiment 2.

Fig. 5 is a schematic structural diagram of background technology 1.

FIG. 6 is a schematic structural diagram of background technology 2.

Fig. 7 is a structural schematic diagram of the fuel tank cap in Fig. 6 .

Detailed ways

Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

Example 1

As shown in Fig. 1, Fig. 2 and Fig. 3, the present invention consists of a fuel tank 1, a fuel tank cap, an adsorption tube 5, a carbon canister 6, a desorption tube 7, a carburetor 8, a joint 11 and a sealing rubber ring 12, wherein the fuel tank The cover is installed in the filler port on the top of the fuel tank 1, and the fuel tank cover is provided with an air pressure balancing passage 9. The fuel tank cap is composed of three parts: the fuel tank cap upper shell 2, the internal component 3 and the fuel tank cap lower shell 4. The internal component 3 is installed in the fuel tank cap lower shell 4, and the bottom of the fuel tank cap lower shell 4 has an air pressure balance channel 9 The air inlet 10, and an anti-roll valve 13 is installed in the air pressure balance channel 9 close to the air inlet 10. The top of the lower shell 4 of the fuel tank cap has a flange 4a, and the cross section of the flange 4a is in the shape of a flat top "∩". The upper shell 2 of the fuel tank cap is buckled on the flange 4a on the top of the lower shell 4 of the fuel tank cap, and the peripheral side wall of the upper shell 2 of the fuel tank cap is attached to the outer ring wall of the "∩" shaped flange 4a of the lower shell of the fuel tank cap, It is limited by the crimping at the bottom of the side wall on the 2 sides of the fuel tank cover.

It can be seen from Fig. 2 that a sealing rubber ring 12 is arranged between the flanging 4a at the top of the fuel tank cap lower shell 4 and the inner top wall of the fuel tank cap upper shell 2, and the top surface of the sealing rubber ring 12 is in contact with the fuel tank cap upper shell 2 The inner top wall of the sealing rubber ring 12 is fitted, and the bottom surface of the sealing rubber ring 12 is fitted with the plane of the flange 4a top. Sealing rubber ring 12 acts as a seal to prevent air leakage between the fuel tank cover lower shell 4 flanging 4a and the fuel tank cover upper shell 2 peripheral side walls.

It can be seen from Fig. 1 and Fig. 2 that the gas outlet of the air pressure balance passage 9 is arranged in the center of the top wall of the upper casing 2 of the fuel tank cap, and a joint 11 is installed at the gas outlet. Except for the air outlet, the setting method of the air pressure balance channel 9 is the same as that of the background technology 2, and will not be repeated here. Described joint 11 is right-angled, is formed by linking vertical section and horizontal section, and the lower end of this joint 11 vertical section stretches in the air outlet of fuel tank cap upper shell 2 top, makes the inner hole of joint 11 communicate with air pressure balance passage 9. The outer wall of the lower end of the vertical section of the joint 11 is welded to the upper shell 2 of the fuel tank cap, the upper end of the vertical section of the joint 11 and one end of the horizontal section pass through a circular arc, and the other end of the horizontal section of the joint 11 is connected to one end of the adsorption tube 5, and the adsorption tube 5 The other end of the carbon tank is connected to the inlet of the carbon tank 6, and the outlet of the carbon tank 6 is connected to the carburetor 8 through the desorption pipe 7. In order to prevent the fuel in the carburetor 8 from flowing back into the carbon tank 6, the carbon tank 6 itself is provided with a one-way valve. A one-way valve can be connected in series.

The working principle of this embodiment is as follows:

An air flow path is formed among the inner cavity of the fuel tank 1, the air pressure balance channel 9, the joint 11, the adsorption tube 5, the carbon tank 6, the desorption tube 7 and the carburetor 8. The passage between the inner cavity, the air pressure balance channel 9, the adsorption tube 5 and the carbon canister 6 can balance the pressure inside and outside the fuel tank to ensure that the fuel tank supplies oil to the carburetor normally through the fuel tank switch; Under the action of the anti-dump valve 13, the volatilized oil vapor in the fuel tank 1 can enter the air pressure balance channel 9, while the liquid fuel cannot flow out from the air pressure balance channel 9 even when the motorcycle tilts or falls, so that the oil vapor in turn Through the air pressure balance channel 9, the adsorption pipe 5 and the carbon canister 6, after being absorbed by the carbon canister 6, it enters the carburetor 8 through the desorption pipe 7 for use.

Example 2

As shown in Fig. 4 and in conjunction with Fig. 1 and Fig. 3, a bushing 17 is welded at the center of the inner top wall of the upper casing 2 of the fuel tank cap. The joint 11 is right-angled and is formed by connecting a vertical section and a horizontal section. The lower end of the vertical section of the joint 11 passes through the air outlet on the top of the upper shell 2 of the fuel tank cap and extends into the bushing 17, and the vertical section of the joint 11 There is a clearance fit between the section and the fuel tank cap upper shell 2. A square bolt 18 is arranged below the bushing 17. The stepped surface in the middle of the square bolt 18 is close to the bottom surface of the bushing 17. The upper end of the square bolt 18 extends into the bushing 17 and is threadedly connected with the lower end of the vertical section of the joint 11. , and an O-ring 20 is provided between the bushing 17 and the joint 11 . The central hole of the square bolt 18 communicates with the inner hole of the joint 11, and an annular groove is formed on the upper end of the vertical section of the joint 11, and a shaft retaining ring 19 is installed in the annular groove, and the shaft retaining ring 19 is located on the fuel tank cover Above the shell 2, and close to the middle part of the top wall of the shell 2 on the fuel tank cap. Shaft retaining ring 19 cooperates with square bolt 18 to play a position-limiting effect and prevent joint 11 from moving up and down relative to fuel tank cap upper shell 2. The rest of the structure of this embodiment is the same as that of Embodiment 1, and will not be repeated here.

In this embodiment, an air flow path is formed between the inner cavity of the fuel tank 1, the air pressure balance channel 9, the square bolt 18, the joint 11, the adsorption tube 5, the carbon canister 6, the desorption tube 7 and the carburetor 8. The work of this embodiment The principle is the same as that in Embodiment 1, and will not be repeated here.

Claims (4)

1. A motorcycle oil vapor adsorption device, comprising a fuel tank (1), a fuel tank cover, an adsorption tube (5), a carbon tank (6), a desorption tube (7) and a carburetor (8), with an air pressure balance channel The fuel tank cap of (9) is installed in the filler port on the top of the fuel tank (1), and the fuel tank cap has a fuel tank cap upper shell (2), an internal component (3) and a fuel tank cap lower shell (4), and the internal component (3) Installed in the lower shell of the fuel tank cover (4), the air inlet (10) of the air pressure balance channel (9) is opened at the bottom of the lower shell of the fuel tank cover (4), and the top of the lower shell of the fuel tank cover (4) has a cross-section of "∩ "shaped flange (4a), the fuel tank cap upper shell (2) is fastened on the flange (4a) on the top of the fuel tank cap lower shell (4), and it is characterized in that: the air pressure balance channel (9) The air outlet is arranged on the top wall of the upper casing (2) of the fuel tank cap, and a joint (11) is installed at the air outlet, and the joint (11) is connected with one end of the adsorption tube (5), and the other end of the adsorption tube (5) One end is connected with the inlet of the carbon tank (6), and the outlet of the carbon tank (6) is connected with the carburetor (8) through the desorption pipe (7); The lower end of the vertical section of the joint (11) extends into the air outlet at the top center of the fuel tank cap upper shell (2), and the upper end of the vertical section of the joint (11) and the horizontal section pass through a circular arc transition; A bushing (17) is welded to the center of the inner top wall of the fuel tank cap upper shell (2), and a square bolt (18) is arranged below the bushing (17), and the upper end of the square bolt (18) extends into the bushing ( 17), and threadedly connected with the lower end of the vertical section of the joint (11), and the central hole of the square bolt (18) communicates with the inner hole of the joint (11), and there is a ring groove at the upper end of the vertical section of the joint (11), A shaft retaining ring (19) is installed in the annular groove, and the shaft retaining ring (19) is positioned above the fuel tank cap upper shell (2). 2. The motorcycle oil vapor adsorption device according to claim 1, characterized in that: between the flange (4a) on the top of the lower shell of the fuel tank cover (4) and the inner top wall of the upper shell of the fuel tank cover (2) A sealing rubber ring (12) is arranged between them. 3. The motorcycle oil vapor adsorption device according to claim 2, characterized in that: the top surface of the flange (4a) is a plane, and the plane is attached to the bottom surface of the sealing rubber ring (12), and the sealing rubber ring The top surface of (12) is fitted with the inner top wall of the fuel tank cap upper shell (2). 4. The motorcycle oil vapor adsorption device according to claim 1, characterized in that: an O-ring (20) is arranged between the bush (17) and the joint (11).

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