JP5044355B2 - Valve structure - Google Patents

Description

  The present invention relates to a valve structure of a component attached to a fuel tank, and more particularly to a valve structure used for a fuel supply valve equipped with a check valve for preventing a backflow of fuel or fuel vapor.

The fuel tank of an automobile has a fuel cut valve and a filler tube for leading the fuel vapor generated in the space above the liquid level in the tank body to the outside of the tank body and keeping the internal pressure inside the tank body constant. Various components such as a fuel supply valve and a fuel pump connected to the fuel pump are attached.
For example, a fuel refueling valve is known that includes a backflow prevention valve for preventing the fuel and fuel vapor in the tank body from flowing back and being discharged outside during refueling (for example, Patent Document 1). reference).

FIG. 6 is a partial cross-sectional view for explaining Patent Document 1. As shown in FIG. 6, a fuel backflow prevention valve main body (hereinafter referred to as a fuel refueling valve) 101 includes an anti-tank coupling portion 102 and a valve main body portion (hereinafter referred to as a valve main body) 103. The valve main body 103 includes a diameter-enlarged portion 112 fitted to the outer peripheral surface of the valve main body connecting portion 105, a poppet valve 114 elastically pressed by a compression coil spring 113, and a valve seat 115 to which the poppet valve 114 abuts and is closed. , An end cap 117 in which a spring seat 116 is formed, a poppet valve receiving portion 118 in which a poppet valve 114 and the like are accommodated, and a connecting portion 119 that connects the enlarged diameter portion 112 and the poppet valve receiving portion 118. Each of these members is formed of a polyacetal resin material having a high resistance to swelling with respect to gasoline, and the poppet valve 114 is usually a valve seat by the elastic force of a compression coil spring (hereinafter also referred to as a spring member) 113. The poppet valve 114 prevents the fuel and the fuel vapor from flowing backward by preventing the fuel and the fuel vapor from leaking to the outside. The poppet valve 114 is pushed away when gasoline flows in from a fuel filler port (not shown).
JP 2003-2074 A (paragraphs “0019” to “0020”)

  However, in the configuration of Patent Document 1, in order to guide the sliding of the valve body by the poppet valve housing portion, a thickness is provided in the sliding direction of the valve body, which is configured to slide in the poppet valve housing portion, There was a problem that the opening for discharging into the tank body was limited. In addition, there is a problem that it is difficult to hold the spring member firmly and a problem that it is difficult to firmly fix the end cap. For this reason, if these are reinforced with a support piece or the like, the number of parts increases, and the opening for discharging the fuel into the tank body is narrowed, which may require time for fuel supply.

  The present invention has been made to solve the above problems, and provides a valve structure capable of ensuring a stable valve body operation with a small number of parts and a wide opening of a fuel discharge port. Let it be an issue.

In the present invention, a fuel passage space and a valve mechanism housing are formed on the upstream side and the downstream side, respectively, and a fuel discharge opening is formed in the peripheral surface around the housing, and is fixed in a tank body for storing fuel. A valve body that shuts off communication between the passage space and the fuel discharge port when positioned on the upstream side, and connects the passage space and the fuel discharge port when moved downstream. A compression coil spring provided between the valve body and the downstream bottom portion of the housing and constantly urging the valve body toward the upstream side, and standing on the downstream bottom portion of the housing to support the compression coil spring and spring guide member, a valve structure with the valve body, which abuts against the seal portion to the housing seal portion of the housing, guide for inserting the spring guide member slidably A cylindrical valve body guide extending upstream and closing the upstream side, and configured to guide the movement of the valve body by insertion of the spring guide member into the guide hole, the spring guide member, It extends to the upstream side from the contact position between the seal part and the housing seal part, and is housed in the valve element guide when the valve is opened and closed .

According to the above configuration, the spring guide member erected from the downstream side bottom (end cap) serves as both restriction of the sliding direction of the valve body and support of the spring member that biases the valve body, thereby Therefore, it is not necessary to have a thickness in the sliding direction as the sliding portion, and the opening area for discharging the fuel into the tank body can be increased. As a result, the housing itself can be shortened and reduced in weight. In addition, the support member that is necessary in the prior art is not necessary, the number of parts is reduced, and the valve body and the compression coil spring are guided in the sliding direction and the urging direction by a common spring guide member, thereby enabling the valve body. Can provide stable operation without being detached from the housing. Further, according to the above configuration, the spring guide member slides in the closed cylindrical valve body guide when the valve is opened and closed, but when the valve is closed, leakage of fuel and steam at the part can be blocked.

  According to the present invention, there is provided a valve structure capable of ensuring stable operation of a valve body with a small number of parts, ensuring a wide opening of a fuel discharge port, and shortening and reducing the weight of the housing itself. can do.

[First Embodiment]
A valve structure according to a first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing a fuel supply valve having a valve structure according to the present embodiment.
As shown in FIG. 1, the fuel tank T is provided with a resin tank body 1 for storing fuel. A valve body (storage space) 30 of the valve structure 2 projects from the inner side surface of the tank body 1, and a joint portion 20 that connects the filler tube 10 projects from the outer surface of the tank body 1. ing. In the state where the fuel is stored, fuel vapor is present inside the tank body 1 together with the fuel. When the internal pressure of the tank body 1 rises due to the fuel vapor, the internal pressure of the tank body 1 is reduced by the fuel cut valve 3 provided above the tank body 1.

FIG. 2 is a partial end face enlarged view showing the valve structure 2 shown in FIG. 1 and its peripheral structure.
As shown in FIG. 2, the valve structure 2 includes a joint portion 20, a valve main body 30, and a cylindrical connecting portion (passage space) 40 that connects the valve main body 30 to the joint portion 20.
The joint portion 20 has a cylindrical shape with a flange portion 20b, covers the opening 1a of the tank main body 1, and is thermally fused and bonded to the tank main body 1. Moreover, the filler tube connection part 20a is provided in the joint part 20, and the filler tube 10 is connected to this filler tube connection part 20a.

The valve body 30 is supported by the joint portion 20 and is built in the tank body 1. The joint portion 20 is provided at one end of the connecting portion 40, and the valve body 30 in which the fuel discharge port 36 is formed is provided at the other end of the connecting portion 40.
In FIG. 2, only one fuel discharge port 36 is shown, but a plurality of fuel discharge ports may be formed, and by providing a plurality of fuel discharge ports, the fuel can be distributed to the tank body. The temperature of the fuel in the tank can be made uniform to suppress the generation of steam.

FIG. 3 is an enlarged perspective view of a partial end surface of the valve main body 30. As shown in FIG. 3, the valve body 30 is provided with a valve body 32 that blocks back flow of fuel and fuel vapor. The valve body 30 is normally closed by the valve body 32.
An end cap 34 is joined to the end of the valve body 30. A rod-shaped spring guide member 35 is erected substantially at the center of the end cap 34, and the compression coil spring 31 is wrapped around the spring guide member 35. One end of the compression coil spring 31 is locked to the end cap 34, and the other end abuts on the valve body 32 to urge the valve body 32 toward the valve closing side.
The housing 33 is provided with a fuel discharge port 36, and fuel such as gasoline supplied through the filler tube 10 (see FIG. 2) enters the tank body 1 (see FIG. 2) from the fuel discharge port 36. Discharged.
Thus, when the valve body 32 is located on the upstream side (fuel supply side), the communication between the connecting portion (passage space) 40 and the fuel discharge port 36 is shut off (valve closed), and the downstream side (fuel discharge port 36 side) ), The connecting portion (passage space) 40 and the fuel discharge port 36 are communicated (valve opening).

Next, the operation of the valve structure in the present embodiment will be described. FIGS. 4A and 4B are operation explanatory views partially in section. FIG. 4A shows when the valve is closed, and FIG.
In the valve body 32, a cylindrical valve body guide 32a having a guide hole 32c is erected on the fuel supply side. In the valve opening / closing operation, as shown in FIGS. 4A to 4B or FIG. 4B to FIG. 4A, the valve body 32 is housed in the cylinder of the valve body guide 32a by the spring guide member 35. Therefore, it can be slid stably following the spring guide member 35.

  When the fuel is not supplied to the valve structure 2, as shown in FIG. 4 (a), the valve is pressed against the housing seal portion 33 b by the urging force of the compression coil spring 31, and the valve Prevents backflow of fuel and fuel vapor (see FIG. 1). The moving direction of the valve body 32 is regulated by the spring guide member 35 being inserted into the guide hole 32c and being accommodated in the valve body guide 32a as described above, so that the seal portion 32b and the housing seal portion 33b The seal surface is prevented from being inclined to cause a leak path.

  When fuel is supplied to the valve structure 2, the fuel moves from the joint portion 20 (see FIG. 2) to the valve body 30 via the connecting portion 40 (see FIG. 2). The valve body 32 is pressed by the pressure of the fuel flowing toward the valve main body 30 and moves in the tank main body 1 (see FIG. 2). At this time, the valve body 32 moves following the spring guide member 35 by the guide hole 32c provided in the valve body 32 and the valve body guide 32a in which the spring guide member 35 is accommodated. As shown in FIG. 4B, the valve body 32 is located on the end cap 34 side, and fuel is discharged from the fuel discharge port 36 into the tank body 1 and stored in the tank body 1.

  The valve structure according to the present embodiment uses a spring guide member 35, which is a spring support member, for moving the valve body 32, unlike the prior art in which the valve body is moved by sliding the outline of the valve body. Therefore, as shown in FIG. 4B, the moving stroke of the valve body 32 can be increased, and the opening of the fuel discharge port 36 can be secured widely. Furthermore, the number of parts can be reduced.

[ Reference embodiment]
The valve structure according to the reference embodiment will be described with reference to FIG.
FIG. 5 is a partial end surface enlarged view showing a state in which a valve body including the valve structure according to the reference embodiment is closed.
In FIG. 5, the same components as those in FIGS. 3 and 4 are given the same reference numerals, and the description thereof is omitted.

  In the present embodiment, the valve guide 32a in the first embodiment is not provided, and as shown in FIG. 5, the spring guide member 35 includes a seal plate 37 on the fuel supply side. The second seal portion 32d that protrudes downstream from the body 32 in a cylindrical shape is in contact with the second seal portion 32d.

Next, the operation of the valve structure having the above configuration will be described.
When fuel is not supplied to the fuel supply valve 2, as shown in FIG. 5, the sealing portion 32b is moved to the housing seal portion 33b by the urging force of the compression coil spring 31, and the second seal portion 32d is a seal member. It is crimped | bonded to 37 and the backflow of the fuel and fuel vapor (refer FIG. 1) in the fuel tank T is prevented. Since the direction of movement of the valve body 32 is regulated by the spring guide member 35 being inserted into the guide hole 32c as described above, the seal surface of the seal portion 32b and the housing seal portion 33b and the second seal portion 32d and the seal are sealed. The seal surface with the member 37 is prevented from being inclined to cause a leak path.

  When fuel is supplied to the fuel supply valve 2, the fuel moves from the joint portion 20 (see FIG. 2) to the valve body 30 via the connecting portion 40 (see FIG. 2). The valve body 32 is pressed by the pressure of the fuel flowing toward the valve main body 30 and moves in the tank main body 1 (see FIG. 2). At this time, the valve body 32 moves following the spring guide member 35 by the guide hole 32 c provided in the valve body 32 and through which the spring guide member 35 is inserted. The valve body 32 moves toward the end cap 34, and fuel is discharged from the fuel discharge port 36 into the tank body 1 and stored in the tank body 1.

Thus, in this embodiment, the spring guide member 35 can be shortened.
In FIG. 5, the second seal portion 32 d is projected as a cylinder so that the valve body 32 can slide more stably. For example, a surface having a sealing property is brought into contact with the seal plate 37. If it forms in a part, it will not be specifically limited to a cylindrical shape.

  The preferred embodiments have been described above. However, the present invention is not limited to the above-described embodiments, and appropriate modifications can be made without departing from the scope of the present invention. For example, in the present embodiment, the description is applied to a fuel tank of an automobile, but the present invention is not limited to this, and it goes without saying that the present invention is also applied to components used in a general container. Needless to say, the present invention is not limited to the fuel supply valve but can be applied to other components constituting the fuel tank.

It is sectional drawing which showed the fuel supply valve provided with the valve structure which concerns on the 1st Embodiment of this invention. It is the partial end surface enlarged view which showed the fuel supply valve provided with the valve structure which concerns on the 1st Embodiment of this invention, and its periphery structure. It is the partial end surface enlarged view which showed the state which the valve main body provided with the valve structure which concerns on the 1st Embodiment of this invention closed. It is a partial end surface enlarged view of a valve body provided with the valve structure concerning a 1st embodiment of the present invention, (a) is a figure showing the closed state, and (b) shows the opened state. FIG. It is the partial end surface enlarged view which showed the state which the valve main body provided with the valve structure which concerns on reference embodiment closed. It is the fragmentary sectional view which showed the valve structure of the prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tank main body 2 Valve structure 30 Valve main body 31 Compression coil spring 32 Valve body 32a Valve body guide 32b Seal part 32c Guide hole 32d 2nd seal part 34 End cap 35 Spring guide member 36 Fuel discharge port 37 Seal plate T Fuel tank

Claims (1)

A fuel passage space and a valve mechanism housing are formed on the upstream side and the downstream side, respectively, and a fuel discharge port is formed in the peripheral surface around the housing, and the valve body is fixed in a tank body for storing fuel. When,
A valve element that blocks communication between the passage space and the fuel discharge port when positioned on the upstream side, and connects the passage space and the fuel discharge port when moved downstream;
A compression coil spring provided between the valve body and the bottom of the downstream side of the housing, and constantly biasing the valve body toward the upstream side;
A spring guide member that is erected on the downstream bottom of the housing and supports the compression coil spring,
The valve body includes a seal portion that comes into contact with a housing seal portion of the housing, a guide hole through which the spring guide member is slidably inserted, and a cylindrical valve body guide that extends upstream and is closed on the upstream side. Provided with a configuration for guiding the movement of the valve body by insertion of the spring guide member into the guide hole,
The spring guide member extends to the upstream side from the contact position between the seal portion and the housing seal portion, and is housed in the valve element guide when the valve is opened and closed. Valve structure.

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