TWI658948B - Fuel tank cap device with function of balancing internal pressure of fuel tank - Google Patents

Abstract

A fuel tank cover device with a function of balancing the internal pressure of a fuel tank includes a socket and a fuel tank cover body which can be locked in the socket. The socket includes a first joint portion for containing the fuel tank cover body and a second A joint portion and a joint portion, the joint portion is provided with a first check valve device, the second joint portion of the socket is provided with a second check valve device, and the first check valve device controls whether external air can enter Inside the fuel tank, the second check valve device controls whether the oil and gas in the fuel tank can be discharged and is connected to an oil and gas filtering device.

Description

Fuel tank cap device with function of balancing internal pressure of fuel tank

The invention relates to a fuel tank cap device with a function of balancing the internal pressure of a fuel tank, in particular to a fuel tank cap device installed outside the fuel tank to prevent fuel in the fuel tank from leaking out and prevent external moisture or impurities from entering the fuel tank. The fuel tank cap device has a function of balancing the internal pressure of the fuel tank. .

A vehicle propelled by an internal combustion engine needs to be equipped with a fuel tank to store fuel. In order to prevent fuel leakage and prevent external moisture or impurities from entering the fuel tank, a fuel tank cap device is provided at a fuel tank port of the fuel tank, which can be locked. The fuel tank cap device is used to tightly seal the fuel tank port to prevent external moisture or impurities from entering the fuel tank. After opening the fuel tank cap device, fuel (such as gasoline) can be added into the fuel tank.

The internal pressure of the fuel tank changes with the temperature or fuel consumption. For example, when the temperature rises, the pressure inside the fuel tank will increase. Consuming fuel under the condition of constant temperature will cause the pressure inside the fuel tank to drop. However, The pressure inside the fuel tank should preferably be close to an atmospheric pressure. If the pressure is too high or too low, it will affect the fuel supply of the internal combustion engine. For this reason, some companies have developed a fuel tank cap device with a two-way valve. Pressure, however, the fuel tank cap device with the two-way valve is provided on the fuel tank cover, but the oil and gas in the fuel tank needs to be filtered by an oil and gas filtering device before the gas in the fuel tank is allowed to be discharged to the atmosphere. Therefore, a duct needs to be used to connect to the oil and gas filtering equipment. However, a duct must be provided on the exposed fuel tank cover, and a part of the duct will also be exposed outside the vehicle's housing. This will increase the probability of the duct being damaged. , And a duct is provided in the movable or rotating fuel tank cover, and the duct also affects the fuel tank cover Moving or rotating.

In order to solve this problem, the present invention provides a fuel tank cap device with a function of balancing the internal pressure of a fuel tank, which is installed at a fuel tank port of a fuel tank, wherein the fuel tank cap device includes a socket, the socket includes a first joint portion and is formed on A second joint portion and a joint portion around the first joint portion, the first joint portion separates a container chamber and a fuel filler port further extended from the container chamber, the fuel filler port being aligned with the fuel tank port, The second joint portion includes an installation space and an exhaust passage extending between the installation space and the filler port, the joint portion includes a placement space and an intake passage extending between the installation space and the filler port, And includes a fuel tank cover, which can be optionally locked in the receptacle of the socket and closes the fuel filler port, the fuel tank cover includes a body, and the bottom end of the body includes an outer sealing ring. When the fuel tank cover is locked, the An outer sealing ring of the fuel tank cover closes the fuel filler port, and the fuel filling port is not in communication with the storage chamber. When the fuel tank cover is not locked, the outer sealing ring of the fuel tank cover is closed. The fuel filler is closed, the fuel filler is in communication with the container, and includes a first check valve device, which includes a first valve piece located in the installation space and displaceable to a non-closed position or a closed position. When the first valve disc is in the closed position, the outside of the fuel tank is not in communication with the fueling port. When the first valve disc is in the non-closed position, the outside of the fuel tank is in communication with the fueling port, and includes a second check valve device. It includes a second valve disc which is located in the installation space and is displaceable to a closed position or a non-closed position. When the second valve disc is in the closed position, the exhaust passage is closed, and the filler port is not connected with the outside of the fuel tank. When the second valve disc is in a non-closed position, the exhaust passage is opened, and the fuel filler port communicates with the outside of the fuel tank.

When the fuel tank cover is combined with the holder and locked, the air outside the fuel tank cover cannot enter the filler port; when the fuel tank cover is combined with the holder and not locked, the air outside the fuel tank cover can enter the filler port; when The fuel tank cover is combined and locked with the seat, and the first valve disc is in the closed position, the second valve disc is in the closed position, and the gas in the filler port cannot be exhausted; when the fuel tank cap is combined with the seat and locked, and the first The valve disc is located in the closed position and the second valve disc is in the non-closed position, and the gas in the fuel filler port is discharged outward through the second one-way valve device; when the fuel tank cover is combined and locked with the seat, and the first valve disc is in a non- In the closed position and the second valve disc is in the closed position, the air outside the fuel tank enters the filler port.

The present invention provides another fuel tank cap device with a function of balancing the internal pressure of a fuel tank, which includes a socket, the socket includes a first joint portion and a second joint portion and a joint portion formed outside the first joint portion. A joint portion includes a fuel filler port, and the socket is adapted to be combined with a fuel tank port of a fuel tank, the fuel filler port is aligned with the fuel tank port, and includes a fuel tank cover body which can be selectively locked in the first seat of the socket. In the joint portion, when the fuel tank cover is locked in the first joint portion, the fuel filler port is closed and includes a first check valve device installed in the joint portion. The first check valve device is suitable for Controlling whether external air can enter the fuel tank and including a second check valve device installed in the second joint portion of the bearing seat, the second check valve device is suitable for controlling whether the oil and gas inside the fuel tank can be discharged.

In the present invention, the first one-way valve device that controls the availability of air intake and the second one-way valve device that controls the availability of air exhaust are both installed in a built-in seat (for example, built into the inner side of a motorcycle shell), The conduit connected to the oil and gas filtering equipment can be hidden inside to reduce the probability of damage to the conduit.

The invention will be understood more clearly from the detailed description which illustrates illustrative embodiments of the invention in conjunction with the drawings.

All the drawings are only for explaining the basic teaching, and the number, position, relationship, and size of the elements constituting the illustrative embodiment will be explained in the drawings or belong to the industry skills after reading and understanding the following description. In addition, after reading and understanding the following description, it is also an industry skill to change the precise dimensions and size ratios to match specific forces, weights, strengths, and similar requirements.

As shown in FIG. 1, FIG. 2 and FIG. 3, the fuel tank cap device 10 of the present invention is mounted on a fuel tank 137, and the fuel tank 137 includes an outer surface 139 and a fuel tank port 151 ( As shown in Figure 3), the fuel tank 137 is used to store fuel, and the fuel is added from the fuel tank port 151 into the fuel tank 137.

As shown in FIGS. 1, 2 and 3, the fuel tank cap device 10 includes a socket 20 fixed on the fuel tank 137, and the socket 20 includes a lower surface 23 and a ring shape formed on the lower surface 23. A groove 25, the socket 20 includes a ring-shaped first joint portion 22, the first joint portion 22 separates a receiving chamber 24, and the socket 20 further includes a neck 26, which is separated from the neck 26 A filling port 32 connected to the chamber 24. The neck 26 further includes an upper end 28 located in the accommodation chamber 24 and a lower end 30 located outside the accommodation chamber 24. The socket 20 further includes a second joint portion 34, a third joint portion 38, a joint portion 211 (as shown in FIG. 1), and a pivot portion 44 (as shown in FIG. 2) formed outside the first joint portion 22. (Shown), wherein the second joint portion 34 further includes an installation space 36 extending from the end surface toward the accommodation chamber 24 but separated from the accommodation chamber 24, and an installation space 36 extending between the installation space 36 and the filler port 32. An exhaust passage 37. The exhaust passage 37 further includes a small-diameter section 37A communicating with the refueling port 32, and a large-diameter section 37B communicating with the installation space 36. The third joint portion 38 includes a rail 40 extending from the outer surface to the receiving chamber 24 and a fixed seat 42 formed on the outer side of the third joint portion 38. The fixed seat 42 is substantially formed of a U-shaped slot. The fixing base 42 is provided to be coupled to one end of a steel cable linked with a main switch lock (not shown).

As shown in Figure 3, the socket 20 is fixed on the fuel tank 137, the lower surface 23 of the socket 20 is abutted against the outer surface 139 of the fuel tank 137, and a fuel tank sealing ring 153 is provided in the groove 25 of the socket 20 The fuel tank sealing ring 153 abuts against the outer surface 139 of the fuel tank 137, so that the seat 20 and the outer surface 139 of the fuel tank 137 are tightly closed to prevent external moisture or impurities from entering through the gap between the seat 20 and the fuel tank 137. In the fuel tank 137, the lower end 30 of the neck 26 is located in the fuel tank port 151 of the fuel tank 137.

As shown in FIG. 3 and FIG. 4, the fuel tank cap device 10 further includes a fuel tank cap body 46 that can be locked in the socket 20. The fuel tank cap body 46 includes a body 48 and is formed around the body 48. A pivoting arm 68 and a hook 66, the body 48 further includes an upper end surface 50 and a lower end surface 52 spaced from the upper end surface 50. The upper end surface 50 includes a first step surface 50A and is located at the first step A second-order surface 50B inside the surface 50A and at a different height from the first-order surface 50A, the height of the second-order surface 50B is slightly higher than the first-order surface 50A. The fuel tank cover 46 further includes a lower joint portion 54 formed between the main body 48 and the lower end surface 52 and having an outer diameter smaller than the outer diameter of the main body 48.

As shown in FIG. 4 and FIG. 5, the pivot arm 68 of the fuel tank cover 46 is pivotally connected to the pivot portion 44 of the socket 20, so that the fuel tank cover 46 can pivot to close or open the fuel filler 32 relative to the socket 20. , And when the fuel filler port 32 is closed, the fuel tank port 151 is also closed. An outer seal ring 70 is movably sleeved on the outer side of the lower joint portion 54 of the fuel tank cover 46, and a circular sheet-shaped blocking member 72 is fixed on the lower end surface 52 of the fuel tank cover 46. The lower part of the fuel tank cover 46 is A plurality of compression springs (not shown) are provided in the end surface 52, and each compression spring biases the outer seal ring 70 toward the blocking member 72. When the fuel tank cover 46 is not locked in the receiving chamber 24 of the seat 20, The plurality of compression springs bias the outer seal ring 70 against the blocking member 72.

As shown in FIG. 3 and FIG. 4, the fuel tank cap device 10 includes a cap 111 and a gasket 111 covering the outer side of the fuel tank cap body 46. The cap 111 includes an outer ring wall 115 and an outer ring wall 115. An inner ring wall 113 on the inside. The cover cover 111 is fixedly disposed on the upper end surface 50 of the fuel tank cover body 46, and the seal pad 114 is sandwiched between the inner ring wall 113 of the cover cover 111 and the second step surface 50B of the fuel tank cover body 46. In addition, the outer ring wall 115 of the cover 111 is in close contact with the first step surface 50A of the fuel tank cover 46.

As shown in FIG. 1, FIG. 3 and FIG. 6, the fuel tank cap device 10 further includes a first check valve device 231 installed at the joint portion 211, and the first check valve device 231 includes a movable accommodation. A first valve plate 239 in the installation space 213 and a first gasket 251 combined with the first valve plate 239 and moving together. The first valve plate 239 is a rubber product, and the first gasket 251 is a metal product. The first valve plate 239 and the first gasket 251 can be moved to a closed position (as shown in FIG. 3) or a non-closed position (as shown in FIG. 6) together in the installation space 213. An outer diameter of the first valve plate 239 is slightly smaller than an inner diameter of the installation space 213. And the first check valve device 231 further includes a first check valve cover 233 coupled to the joint portion 211, and a seal ring sandwiched between the first check valve cover 233 and an end surface of the joint portion 211. 237, the first one-way valve cover 233 includes an air inlet hole 235 communicating with the installation space 213. A first spring 253 is accommodated between the first gasket 251 and the inner surface of the installation space 213. The first spring 253 biases the first gasket 251 together with the first valve plate 239 in a closed position, and the seal The ring 237 is used to provide a sealing connection between the first one-way valve cover 233 and the joint portion 211.

As shown in FIG. 1, FIG. 2, FIG. 3, and FIG. 7, the fuel tank cap device 10 further includes a second check valve device 88 and a second check valve device installed on the second joint portion 34. 88 includes a second valve disc 90 movably accommodated in the installation space 36 and a second gasket 92 combined with the second valve disc 90 and moving together. In fact, the second valve disc 90 is a rubber product. The second gasket 92 is a metal product, and the second valve disc 90 and the second gasket 92 can be moved to a closed position (as shown in FIG. 3) or a non-closed position (as shown in FIG. 3) together in the installation space 36. 7), the outer diameter of the second valve disc 90 is slightly smaller than the inner diameter of the installation space 36, and the second check valve device 88 further includes a second one-way valve coupled to the second coupling portion 34 The valve cover 96 and a sealing ring 99 sandwiched between the second one-way valve cover 96 and the end surface of the second joint portion 34. The second one-way valve cover 96 includes a mouthpiece 97 extending from the end surface and a connection An end face of the 97 extends to an exhaust hole 98 (as shown in FIG. 3) of the installation space 36, and a second spring 94 is housed between the second gasket 92 and the second one-way valve cover 96. The spring 94 biases the second gasket 92 together with the second valve disc 90 in the closed position, and the sealing ring 99 is used to provide a sealing connection between the second one-way valve cover 96 and the second joint portion 34. As shown in FIG. 2, the nozzle 97 of the second one-way valve cover 96 can be connected to an oil and gas filtering device 157 by using a pipe 155. The oil and gas filtering device 157 allows the oil and gas in the fuel tank to pass through and is discharged to the atmosphere. The oil and gas filtering equipment 157 also allows air in the atmosphere to enter the oil tank 137 through the oil and gas filtering equipment 157.

As shown in FIG. 1, FIG. 4 and FIG. 5, a locking mechanism 158 is provided on the third joint portion 38 of the socket 20 for locking the fuel tank cover 46. The locking mechanism 158 includes an engaging member 159 movably received in the track 40 of the third joint portion 38, and the engaging member 159 includes an engaging end 171 facing the receiving chamber 24 and a push rod 173. 173 extends out of the outer side of the rail 40, and the engaging member 159 is displaceable along the rail 40 to an engaging end 171 in an engaging position (shown in FIG. 4) in the receiving chamber 24 or the engaging end 171 is located on the rail A non-engaging position within 40 (as shown in Figure 5).

The locking mechanism 158 further includes a pull handle 175 pivotally disposed on the lower surface of the third joint portion 38. The pull handle 175 includes a pivot portion 177 and a pull portion 179. The pull handle 175 further includes a pivot portion 177 and a pull portion. A pushing groove 191 between the parts 179. The pivot portion 177 of the pull handle 175 is pivotally connected to the third joint portion 38. The push rod 173 of the engaging member 159 is combined with the push groove 191 of the pull handle 175. The pull portion 179 of the pull handle 175 is used to be combined with the steel cable. Operating the main switch lock to pull the steel cable (not shown in the figure) can drive the pull handle 175 to pivot and further link the engaging member 159 to the engaging position or the non-engaging position.

Refer to Figures 3 and 4 for the convenience of explanation. It is assumed that the pressure inside the fuel tank 137 is approximately equal to an atmospheric pressure. The fuel tank cover 46 is pivoted into the receiving chamber 24 located in the socket 20 and is locked by the locking mechanism 158. The engaging member 159 is locked (as shown in FIG. 4), and the hook 66 of the fuel tank cover 46 is blocked by the engaging end 171 of the engaging member 159, so that the fuel tank cover 46 is locked and the outer surface of the fuel tank cover 46 is sealed. The ring 70 abuts closely against the upper end 28 of the neck 26 of the socket 20, so that the fuel filler port 32 is sealed by the outer seal ring 70. Refueling port 32 and fuel tank port 151 are not connected with the receiving chamber 24 of the socket 20, and the oil and gas in the fuel tank 137 cannot leak from the fuel tank port 151 and the fueling port 32 to the receiving chamber 24 of the bearing 20 to further leak to the outside world. .

In addition, the second valve disc 90 of the second one-way valve device 88 is located in the closed position, so that the second valve disc 90 seals the exhaust hole 98 of the second one-way valve cover 96, so that the fuel tank port 151 and the fuel filler port 32 and The duct 155 and the oil and gas filtering equipment 157 are not connected to each other. It is worth mentioning that in a state where the first valve disc 251 is in the closed position and the second valve disc 90 is in the closed position, the pressure inside the fuel tank 137 is approximately close to the pressure outside the fuel tank 137, so the first valve disc The 239 is biased in the closed position by the first spring 253, and the second valve disc 90 is biased in the closed position by the second spring 94.

The pressure inside the fuel tank 137 will change with the temperature change or different usage conditions. For example, when the temperature rises, the pressure inside the fuel tank 137 will increase as the temperature rises, or when the fuel inside the fuel tank 137 is consumed, the fuel tank Negative pressure will be generated inside the 137. Assume that the temperature rises inside the fuel tank 137, and the pressure inside the fuel tank 137 is transmitted to the second valve disc 90 through the exhaust passage 37. When the pressure inside the fuel tank 137 is higher than the elastic force of the second spring 94, The second valve plate 90 will compress the second spring 94 from the closed position closing the exhaust passage 37 to the non-closed position (as shown in FIG. 7). In this way, the exhaust passage 37 is opened, and the pressure inside the fuel tank 137 is further increased ( Oil and gas) That is, the small diameter section 37A and the large diameter section 37B of the exhaust passage 37 enter the installation space 36, and further guide the oil and gas filtering device 157 through the exhaust hole 98 and the duct 155, and the oil and gas is filtered by the oil and gas filtering device 157. After that, it is discharged to the atmosphere, and when the pressure inside the fuel tank 137 decreases to less than the elastic force of the second spring 94, the second spring 94 biases the second valve plate 90 to return to the closed position.

Assume that the internal fuel in the fuel tank 137 causes a negative pressure inside the fuel tank 137 with the use. When the negative pressure is greater than the elastic force of the first spring 253, the first valve plate 239 compresses the first spring 253 from the closed position (as shown in FIG. 3). (Shown) is moved to a non-closed position (as shown in FIG. 6), so that the air inlet 235 is opened, and the air outside the fuel tank cover device 10 enters the installation space 213 from the air inlet 235, and then the installation space 213 The air inlet passage 215 enters the refueling hole 32 and the fuel tank port 151 enters the interior of the fuel tank 137 until the pressure inside the fuel tank 137 recovers from negative pressure to the same or close to the atmospheric pressure. The first spring 253 biases the first gasket The 251 is reset to the closed position together with the first valve plate 239 (as shown in Fig. 3).

If the fuel tank cover 46 is to be operated in an unlocked state, the main switch lock is operated to pull the cable to pivot the handle 175 (not shown), and further pull the handle 175 to drive the engaging member 159 to engage. The position is shifted to the non-engaging position, so that the engaging end 171 of the engaging member 159 is released from the hook 66 of the fuel tank cover 46, so that the fuel tank cover 46 is not locked by the engaging member 159, so it can be pivoted relative to the bearing seat 20 The fuel tank cover 46 is far from the neck 26, and the fuel filler port 32 and the fuel tank port 151 are further opened (as shown in FIG. 5), so that fuel can be added through the fuel filler port 32 and the fuel tank port 151.

The fuel tank cap device 10 of the present invention controls whether the air outside the fuel tank cap device 10 can enter the fuel tank 137 through the first check valve device 231, and controls whether the oil and gas in the fuel tank 137 can be discharged from the fuel tank 137 through the second check valve device 88. In addition, the pressure value in the fuel tank 137 can be controlled in a balanced manner within the proper operating range, and at the same time, the effect of preventing fuel leakage in the fuel tank 137 can be prevented.

In the present invention, the first check valve device 231 for controlling the intake air and the second check valve device for exhausting the air are installed in the seat 20 which is built in (for example, built in the inner side of a motorcycle shell) so that The duct 155 connected to the oil and gas filtering equipment 157 can be hidden inside, thereby reducing the probability of damage to the duct 155, and can smoothly introduce external air into the tank 137 to balance the pressure when excessive negative pressure is generated inside the tank 137. Alternatively, when the internal pressure of the fuel tank 137 rises to be greater than the elastic force of the second spring 94, the pressure inside the fuel tank 137 is discharged outside the fuel tank 137.

The inner and outer ring walls 113 and 115 of the cover 111 are matched with the first and second step surfaces 50A and 50B of the upper end surface 50 of the fuel tank cover body 46 to form a step-shaped seal combination, and the outer seal ring 70 can be dense. Closed above the fuel filler 32, it can effectively prevent moisture or impurities from outside the fuel tank cap device 10 from entering the fuel tank 137.

The fuel tank cap device 10 of the present invention mounts both the first and second check valve devices 231 and 88 on the seat 20, and the seat 20 is installed in the housing of the motorcycle. In other words, the first The second and second check valve devices 231 and 88 are protected by the outer shell of the motorcycle. Therefore, dust and moisture outside the fuel tank cover device 10 cannot easily enter the fuel tank 137 through the gap between the first and second check valve devices 231 and 88, so that The first and second check valve devices 231 and 88 can also prevent unnecessary dust and moisture from entering the oil tank 137 in addition to regulating the internal pressure of the oil tank 137.

The basic teachings of the present invention have been described, and many extensions and variations will be apparent to those skilled in the art. For example, the fuel tank cap device 10 may not include a locking mechanism 158, and the fuel tank cap body 46 may not include a pivoting arm 68. Thus, the outer surface of the fuel tank cap body 46 and the inner surface of the seat 20 may be provided to cooperate with each other. Thread, so that the fuel tank cover 46 and the socket 20 can be provided with a closed fuel filler port 32.

Since the present invention disclosed in the specification can be implemented in other specific forms without departing from the spirit or general characteristics of the present invention, and some forms of these specific forms have been pointed out, the embodiments disclosed in the specification should be regarded as illustrative rather than limiting. The scope of the present invention is defined by the scope of the attached patent application, not by the above description. All changes that fall within the meaning and scope of the scope of the patent application will still be included in the scope of the invention.

10‧‧‧ Fuel tank cap device

20‧‧‧ seat

22‧‧‧ the first joint

23‧‧‧ lower surface

24‧‧‧capacity room

25‧‧‧ groove

26‧‧‧ neck

28‧‧‧ upper end

30‧‧‧ lower end

32‧‧‧ filler

34‧‧‧ the second joint

36‧‧‧Installation space

37‧‧‧Exhaust channel

37A‧‧‧ Trail

37B‧‧‧Large Trail Section

38‧‧‧ Third Joint

40‧‧‧track

42‧‧‧Fixed

44‧‧‧ pivot

46‧‧‧ fuel tank cover

48‧‧‧ Ontology

50‧‧‧ upper end

50A‧‧‧First-order surface

50B‧‧‧Second-order surface

52 · ‧‧ lower end

54‧‧‧ lower joint

66‧‧‧Hook

68‧‧‧ Pivot Arm

70‧‧‧ outer seal ring

72‧‧‧ Obstruction

88‧‧‧Second check valve device

90‧‧‧Second valve disc

92‧‧‧Second gasket

94 · ‧‧Second Spring

96‧‧‧Second one-way valve cover

97‧‧‧ take the mouth

98‧‧‧ exhaust hole

99‧‧‧seal ring

111 · ‧‧ cap

113 · ‧‧Inner ring wall

115 · ‧‧ Outer ring wall

117‧‧‧Seal ring

137‧‧‧ fuel tank

139‧‧‧outer surface

151‧‧‧ Fuel tank port

153‧‧‧ Fuel tank sealing ring

155‧‧‧ Catheter

157‧‧‧oil and gas filtration equipment

158‧‧‧Locking mechanism

159‧‧‧ Engagement

171‧‧‧ Engagement ends

173‧‧‧Put

175‧‧‧Handle

177‧‧‧ pivot

179‧‧‧Pull

1911 ‧ ‧ push the trough

211‧‧‧Joint

2113‧‧‧Relocation space

215‧‧‧Air inlet channel

231‧‧‧The first check valve device

233‧‧‧The first one-way valve cover

235‧‧‧Air inlet

237‧‧‧Seal ring

239‧‧‧The first valve disc

251‧‧‧The first gasket

253‧‧‧The first spring

FIG. 1 is an exploded perspective view of a fuel tank cap device of the present invention.

Fig. 2 is a perspective assembled view of the fuel tank cap device of the present invention.

Figure 3 is a sectional view taken along line 3-3 of Figure 2.

Figure 4 is a sectional view taken along line 4-4 of Figure 2.

FIG. 5 is a state diagram of the fuel tank cover device of the fuel tank cover device of the present invention after it is unlocked and opened.

Figure 6 shows a state diagram where the second valve disc is displaced to a non-closed position due to excessive oil and gas pressure inside the fuel tank.

Figure 7 shows the state of the first valve disc being displaced to a non-closed position due to the excessive negative pressure generated inside the fuel tank.

In different drawings, the same reference numerals are used to indicate the same or similar elements; please also understand that the terms such as "first", "second", "height", "end", "side", and the like are only for convenience. The viewer refers to the structure in the figure and is only used to help describe the illustrative embodiment.

Claims (7)

A fuel tank cap device with a function of balancing the internal pressure of a fuel tank is installed at a fuel tank port of a fuel tank, wherein the fuel tank cap device includes a socket, including a first joint portion and a second joint formed around the first joint portion. A joint portion and a joint portion, the first joint portion separates a storage room and a neck located in the storage room, the neck includes an upper end located in the storage room and a lower end located outside the storage room, and a lower end of the neck The fuel tank is accommodated in a fuel tank port of the fuel tank, and a fuel filler port is separated from the neck. The fuel filler port is aligned with the fuel tank port. The second joint includes an installation space and an exhaust passage extending between the installation space and the neck. The joint includes a seating space and an air inlet channel extending between the seating space and the neck; a fuel tank cover is optionally locked in the receiving chamber of the socket and closes the fuel filler port When the fuel tank cover is locked in the accommodating chamber, the refueling port is not in communication with the accommodating chamber. When the fuel tank cover is not locked in the accommodating chamber, the refueling port is in communication with the accommodating chamber. A first non-return valve device includes a first valve plate located in a receiving space of a joint portion and movable to a non-closed position or a closed position. When the first valve plate is in the closed position, the The exterior is not connected to the fuel filler port. When the first valve disc is in a non-closed position, the exterior of the fuel tank cap device communicates with the fuel filler port. A second one-way valve device includes an installation space and is displaceable to a closed position. Position or a non-closed position of a second valve disc, when the second valve disc is in the closed position, the exhaust passage is closed, the fuel filler is not connected to the outside of the fuel tank, and when the second valve disc is in the non-closed position When the exhaust passage is opened, the fuel filler port communicates with the outside of the fuel tank cap device; when the fuel tank cap is combined with the seat and locked, and the first valve disc is in a closed position, and the second valve disc is in a closed position , The air outside the fuel tank cap device cannot enter the filler port and the oil and gas inside the fuel tank cannot be discharged outside the fuel tank cap device; when the fuel tank cap body is combined with the seat and locked, and the first valve plate is located Closed position, and the second valve disc is in the non-closed position, the gas in the filler port is discharged outward through the second one-way valve device; when the fuel tank cover is combined with the seat and locked, and the first valve disc is in the non-closed position, In addition, the second valve plate is located in the closed position, and the air outside the fuel tank enters the fueling port through the first check valve device. The fuel tank cap device with the function of balancing the internal pressure of the fuel tank as described in item 1 of the scope of the patent application, wherein the first check valve device further includes a first check valve cover fixed on the outside of the joint portion and covering the placement. Space, the first one-way valve cover includes an air inlet hole communicating with the installation space. When the first valve plate is in a closed position, the first valve plate closes the air inlet hole. When the first valve plate is in a non-closed position, Position, the air inlet is opened. The fuel tank cap device with the function of balancing the internal pressure of the fuel tank according to item 2 of the patent application scope, wherein the second one-way valve device further includes: a second one-way valve cover that is fixed outside the second joint portion and covers the In the installation space, the second one-way valve cover further includes a mouthpiece, and an exhaust hole extending from an end surface of the mouthpiece to the installation space. The fuel tank cap device with a function of balancing the internal pressure of the fuel tank according to item 1 of the scope of the patent application, wherein the exhaust passage of the second joint portion further includes a small diameter section communicating with the fuel filler port, and a connection with the installation space. A long trail. The fuel tank cap device with the function of balancing the internal pressure of the fuel tank according to item 1 of the scope of the patent application, further comprising: a fuel tank sealing ring, the socket further comprising a lower surface and an annular ring formed on the lower surface and located outside the neck. A groove, a fuel tank sealing ring is installed in the groove, the fuel tank further includes an outer surface, the fuel tank opening is formed on the outer surface, and the fuel tank sealing ring abuts closely between the bearing seat and the fuel tank. A fuel tank cap device with a function of balancing the internal pressure of a fuel tank includes a socket including a first joint portion, a second joint portion and a joint portion formed outside the first joint portion, and the socket further includes a neck portion. The neck includes an upper end located in the container chamber and a lower end located outside the container chamber. The lower end of the neck is accommodated in the fuel tank port of the fuel tank, and the neck part defines a fuel filler port. An exhaust passage, the joint portion includes an intake passage communicating with a fuel filler port, and the socket is adapted to be combined at a fuel tank port of a fuel tank, the fuel filler port is aligned with the fuel tank port; a fuel tank cover, optionally Locked in the first joint of the socket, the fuel filler is closed when the fuel tank cover is locked in the first joint; a first check valve device is installed in the joint, The first one-way valve device is suitable for controlling whether external air can enter the fuel tank through the intake passage; a second one-way valve device is installed in the second joint portion of the bearing seat. Oil check valve means adapted to control whether inside the tank is discharged through the exhaust passage. According to the fuel tank cap device with the function of balancing the internal pressure of the fuel tank according to item 6 of the patent application scope, wherein the second one-way valve device is connected to an oil and gas filtering device, and after the oil and gas discharged from the fuel tank is filtered by the oil and gas filtering device Before being discharged to the atmosphere.