JPS6039480Y2 - Fuel spill control device in vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a device for controlling the outflow of fuel from a fuel reservoir in a vehicle.

A control device that detects the driving position of the vehicle, such as tilting or overturning, or intrusion of fuel into the path leading from the vehicle's fuel reservoir to the evaporative fuel recovery device, and blocks the path and prevents fuel from flowing out from the fuel reservoir. is well known.

In a device in which the valve device for blocking the passage and the weight for sensing the driving posture of the vehicle are integrated, the valve and valve seat of the valve device are particularly useful in vehicles with severe vibration conditions such as motorcycles. A strong impact force is applied to the parts, which has the disadvantage of reducing sealing performance.

Furthermore, since the weight is provided in the valve device so as to be easily movable, it is difficult to stabilize the valve center axis provided on the weight on the same axis, even if the valve is seated on the valve seat. In some cases, it was not possible to maintain sufficient airtightness, which was unfavorable in terms of quality.

Furthermore, if the fuel reservoir was left outdoors for a long time in a tilted or overturned state, and the internal pressure increased as the fuel reservoir received solar heat, there were cases where the fuel reservoir became deformed or damaged.

Furthermore, when the fuel reservoir is left outdoors in a tilted or overturned state and the fuel reservoir is cooled, the internal pressure decreases, and the fuel reservoir may become deformed or damaged due to negative pressure.

Therefore, in order to prevent such damage, positive pressure safety valves and negative pressure safety valves have been provided in addition to the above-mentioned valve devices.

This complicates the piping of the vehicle, and at the same time poses problems in terms of ease of mounting on the vehicle and high cost.

The purpose of this invention is to propose a fuel outflow control device that can solve the above problems and improve the durability of the valve device.

Next, an embodiment of this proposal shown in the drawings will be described.

Figure 1 is a system diagram of a device that adsorbs and desorbs evaporated fuel from a vehicle's fuel reservoir to an evaporated fuel recovery device (canister), in which 1 is a fuel tank, 2 is an evaporative fuel passage, 3 is a fuel outflow control device, and 4 5 represents a scavenging passage, and 6 represents an intake passage.

FIG. 2 shows an embodiment of the fuel outflow control device 3.
is a case, and an inlet pipe 8 is provided at the lower part of the case, and an outlet pipe 9 is provided at the upper part.

Reference numeral 10 is a weight, which is provided in the case 7 so as to be able to slide up and down, and a valve body 1 for opening and closing the outlet pipe 9 is mounted on the upper part of the weight.
1 is placed.

The valve body 11 is connected to a weight 10 via a valve spring 13 and a valve pusher rod 14.
It is configured so that it can be seated on and removed from a valve seat 12 provided on the outlet pipe 9 side of the case 8 as the weight 10 moves up and down.

Thus, movement of the valve body 11 in the same direction as the fluid flows out into the outlet pipe 9 will cause the valve to close.

Numeral 15 is a weight spring that urges the weight 10 upward, and its urging force is such that when the case 7 is in a vertical state, the weight 10 descends;
When the case 7 is tilted more than a predetermined amount, the component force of gravity of the weight 10 in the direction of extension of the weight spring 15 decreases, and the weight spring 15 expands by overcoming this component force, causing the weight 10 to move toward the valve seat 1.
2, the weight 10 pushes the valve pusher rod 14, valve spring 13, and valve body 11, and the valve body 11 seats on the valve seat 12, and communication between the inlet pipe 8 and the outlet pipe 9 is cut off. It is configured like this.

When the case 7 is tilted more than a certain level, the movement of the weight 10 is restricted by the weight receiver 18, so the valve pusher rod 14 and the valve spring 1
The force acting on the valve body 11 through the valve body 3 is limited so that it does not exceed a certain load.

When the case 7 is tilted more than a certain level and the valve body 11 is seated on the valve seat 12, when a certain degree or more of negative pressure is applied, that is, pressure from the outlet pipe 9 toward the valve body 11, the pressure acts on the valve body 11. This acts to overcome the force of the pushing valve spring 13, causing the valve body 11 to move away from the valve seat 12, and the inlet pipe 8 and outlet pipe 9 to communicate with each other.

Figure 3 shows that the fuel outflow control device in Figure 2 is tilted over a certain level.
The valve body 11 is seated on the valve seat 12, and communication between the inlet pipe 8 and the outlet pipe 9 is cut off.

Also, if fuel enters the fuel outflow control device 3, the weight 1
0, the weight of the weight 10 becomes lighter, and the weight spring 15 raises the weight 10, pushing up the valve pusher rod 14, valve spring 13, and valve body 11, so that the valve body 11 moves toward the valve. When the seat 12 is seated, communication between the inlet pipe 8 and the outlet pipe 9 is cut off.

In this case, as in the case of tilting, when a negative pressure of a certain level or more is applied while the person is seated, the valve body 11 moves away from the valve seat 12, and the inlet pipe 8 and the outlet pipe 9 can communicate with each other.

FIG. 4 shows a state in which fuel has entered the fuel outflow control device shown in FIG. 2 to the full position, the valve body 11 is seated on the valve seat 12, and communication between the inlet pipe 8 and the outlet pipe 9 is cut off. It shows.

In order to prevent the weight from becoming difficult to move due to the surface tension caused by the fuel between the weight 10 and the cover 17 when fuel enters the fuel outflow control device 3, a part of the weight 10 is cut out to create a passage. 16 are provided.

In addition, consideration has been given to the shape and structure of the weight 10 and the inner wall of the case 7, such as by providing an appropriate gap between the weight 10 and the inner wall of the case 7 to prevent surface tension from occurring due to the fuel.

When the vehicle tilts over a certain level, the weight 10 moves upward as shown in FIG. Since the communication with the inlet pipe 8 is cut off, even if liquid fuel enters from the inlet pipe 8, it will not flow out to the outlet pipe 9.

In this state, when the outlet pipe 8 side reaches a certain level of negative pressure, this pressure acts to overcome the force of the valve spring 13 pushing up the valve body 12, causing the valve body 11 to separate from the valve seat 12, causing the inlet pipe 8 to
Since the fuel tank 1 and the outlet pipe 9 are communicated with each other, deformation and damage of the fuel tank 1 etc. due to excessive negative pressure can be prevented.

Furthermore, when the vehicle is in operation, the weight 10 moves up and down due to vibrations and hits the weight receiver 18, so the force acting on the valve body 11 due to the movement of the weight 10 is absorbed by the seal on the valve seat 12. With only the force of the valve spring 13 required for
Therefore, the life of the valve body 11 and valve seat 12 is extended.

The operation of the valve body 11 is separated from the movement of the weight 10,
The valve body 11 and the valve seat 1 move while being guided by a small sliding part of the case 7 that is constructed with high precision relative to the valve seat 12.
The valve action with 2 is reliably carried out over a long period of time.

In addition, as shown in FIG. 4, even when the fuel has entered the position Ll-Ll, the weight 10 moves upward due to the buoyancy of the weight 10, pushing up the valve pusher rod 14 and pushing the valve body 11 upward. is seated on the valve seat 12 and communication between the inlet pipe 8 and the outlet pipe 9 is cut off, so even if liquid fuel enters the inlet pipe 8 side, it does not flow out to the outlet pipe 9.

Naturally, even if the fuel intrudes due to the inclination of more than a certain level, the valve body 11 will move to the valve seat 12 in the same manner as described above.
Since the communication between the inlet pipe 8 and the outlet pipe 9 is cut off, even if liquid fuel enters the inlet pipe 8 side, the outlet pipe 9
Fuel will not leak to the side.

Also, even if the vehicle is overturned by 180 degrees and fuel enters, the sum of the set load of the weight spring 15 and the dead weight of the weight 10 is set to be greater than the buoyancy of the weight 10. , the valve body 11 is seated on the valve seat 12 as described above,
Since the inlet pipe 8 and the outlet pipe 9 are blocked, even if liquid fuel enters the inlet pipe 8 side, the valve body 11 prevents it from flowing out to the outlet pipe 9.

FIG. 5 shows another embodiment, which is a modification of FIG. 2, and only the changed parts will be explained.

The outlet pipe 9 provided at the upper part of the case 7a is connected to the inlet pipe 8 through a passage where the valve body 11 acts, and also has a positive pressure passage 19 that allows flow only from the inlet pipe 8 to the outlet pipe 9 side. It is communicated.

The positive pressure passage 19 includes a second valve spring 20, a second valve body 21,
A second valve seat 22 is provided to constitute a check valve.

In this embodiment, when the vehicle is tilted more than a certain level or when fuel enters the case 7 and the valve body 11 is seated on the valve seat 12 and the communication between the inlet pipe 8 and the outlet pipe 9 is cut off, the inlet When the pressure on the tube 8 side exceeds a certain positive pressure, the pressure increases to the positive pressure passage 19.
The second valve body 21 provided at Prevents deformation and damage of 1st grade.

The other functions are the same as those of the embodiment shown in FIG.

FIG. 6 shows another embodiment, which is a modification of FIG. 2, and only the changed parts will be explained.

The outlet pipe 9 provided at the upper part of the case 7b is connected to the inlet pipe 8 through a passage where the valve body 11 acts, and is also connected to a negative pressure passage 23 which allows flow only from the outlet pipe 9 to the inlet pipe 8 side. It is communicated.

The negative pressure passage 23 is provided with a third valve seat 24, a third valve body 25, a third valve spring 26, and a spring receiver 27, forming a check valve.

In the embodiment shown in FIG. 6, when the vehicle is tilted more than a certain level or when fuel enters, the valve body 11 is seated on the valve seat 12, and the inlet pipe 8
When the communication between the inlet pipe 9 and the outlet pipe 9 is cut off, if the pressure on the inlet pipe 8 side exceeds a certain level of negative pressure, the pressure causes the third valve element 25 provided in the negative pressure passage 23 to It overcomes the force and pushes down, and the inlet pipe 8 and outlet pipe 9 communicate with each other, thereby preventing deformation and damage to the fuel reservoir such as the fuel tank 1 due to excessive negative pressure.

In this case, negative pressure also acts on the valve structure composed of the valve body 11 and the valve seat 12, but the set pressure is set at the third valve body 25.
The pressure is such that the valve will not open unless the negative pressure becomes greater than the valve opening pressure of the valve configuration consisting of the third valve seat 24 and the third valve seat 24.

The other functions are the same as those of the embodiment shown in FIG.

FIG. 7 shows another embodiment, which is a modification of FIG. 2, and only the changed parts will be explained.

The outlet pipe 9 provided at the upper part of the case 7c is a passage on which the valve body 11 acts and communicates with the inlet pipe 8, and also has a positive pressure passage 19 that allows flow only from the inlet pipe 8 to the outlet pipe 9 side. , a negative pressure passage 2 that allows flow only from the outlet pipe 9 to the inlet pipe 8 side.
3 is also connected.

The positive pressure passage 19 includes a second valve spring 20, a second valve body 21,
A second valve seat 22 is provided to constitute a check valve.

The negative pressure passage 23 includes a third valve seat 24, a third valve body 25,
A third valve spring 26 and a spring receiver 27 are provided to constitute another check valve.

In the embodiment shown in FIG. 7, when the vehicle is tilted over a certain level or fuel enters, the valve body 11 is seated on the valve seat 12 and the communication between the waist inlet pipe 8 and the outlet pipe 9 is cut off. At this time, when the pressure on the inlet pipe 8 side exceeds a predetermined positive pressure, the pressure overcomes the force of the second valve spring 20 and pushes up the second valve element 21 provided in the positive pressure passage 19, causing the inlet pipe 8 and Since the outlet pipe 9 is in communication, deformation and damage of the fuel tank 1 etc. due to abnormal pressure can be prevented.

Moreover, when the communication between the inlet pipe 8 and the outlet pipe 9 is cut off,
When the inlet pipe 8 side reaches a certain level of negative pressure, the pressure overcomes the force of the third valve spring 26 and pushes down the third valve body 25 provided in the negative pressure passage 23, and the inlet pipe 8 and outlet pipe 9 are brought into communication. Therefore, deformation and damage of the fuel tank 1 etc. due to abnormal negative pressure is prevented.

In this case, negative pressure also acts on the valve structure made up of the valve body 11 and the valve seat 12, but the set pressure is made up of the third valve body 25 and the third valve seat 24. The pressure is such that the valve will not open unless the negative pressure becomes greater than the valve opening pressure of the valve structure.

Further operations are the same as those of the embodiment shown in FIG.

FIG. 8 shows another embodiment, which is a modification of FIG. 2, and only the changed parts will be explained.

In FIG. 2, the inlet pipe 8 of the case 7 body is connected to the fuel tank 1 through another pipe, but in FIG.
It has a structure in which it is press-fitted through 8.

A cover 17a fitted to the lower part of the case 7b has a communication port 8a which communicates with the air layer of the fuel tank.

The embodiment shown in FIG. 8 has exactly the same effect as the embodiment shown in FIG. 2, except that the piping is simplified compared to the case shown in FIG.

In each of the above-mentioned embodiments, if the vehicle is not tilted more than a certain level or if more than a certain amount of fuel has not entered the fuel outflow control device 3, the fuel tank 1 is separated from the evaporated fuel recovery device 4. Since the fuel passage 2 is communicated with the fuel outflow control device 3, the evaporated fuel generated in the fuel tank 1 is collected by the evaporated fuel recovery device 4 and is not released into the atmosphere.

As described above, in this invention, the evaporated fuel passage is connected to the valve body 11 and the valve seat in order to prevent fuel from flowing out from the fuel reservoir when the vehicle is tilted or when fuel enters the fuel outflow control device.
Even when the tank is shut off in step 2, if the pressure inside the tank abnormally decreases or increases, the pressure is adjusted appropriately, thereby preventing the risk of deformation or damage to the fuel reservoir.

Even in such an abnormal situation, the fuel that flows out from the fuel tank is discharged to the evaporated fuel recovery device, so there is no danger of air pollution or fire compared to the conventional method in which the fuel is simply discharged into the atmosphere.

Furthermore, since the impact force acting on the valve and valve seat of the valve device can be alleviated, the durability of the valve device can be significantly improved even in vehicles with severe vibration conditions such as motorcycles.

Furthermore, by separating the valve body and the weight, the side wall of the weight will wear out, not only during initial assembly, but also due to vibration of the weight.
Even if the center of the weight is displaced, the center axis of the valve body and the center axis of the valve seat can be stabilized on the same axis, and the valve body is always accurately seated on the valve seat, ensuring airtightness of the valve part. Retained.

This makes it possible to reliably prevent fuel from flowing out from the fuel reservoir.

Furthermore, since the moving direction of the valve body 11 when it is seated on the valve seat 12 is the same as the outflow direction of the fluid, the closing force of the valve increases as the pressure that tries to outflow increases, and the operation becomes more reliable. Become.

In particular, in this invention, a passage 16 is provided at the lower edge of the weight having a mouth-like cross-section, so that the weight rises due to the surface force caused by the fuel between the lower edge of the weight and the case cover 17. Even when the fuel control device is in an upright state, when the fuel enters the case to a predetermined height, the weight floats up due to buoyancy and the valve can be closed reliably.

In addition, a valve pushing rod 14 is protruded from the top surface of the weight, and is inserted into the hollow interior of the valve body 11 to push up the valve body via the valve spring, so that the valve body does not touch the weight. Even if it is a separate body, it is easy to align the center of the valve seat and ensure watertightness.The presence of the valve spring has the advantage of mitigating the impact of the valve body against the valve seat and preventing deterioration of sealing performance. Yes, it is practically effective.

In addition, in Fig. 1, a canister filled with an adsorbent such as activated carbon is used as the evaporated fuel recovery device.
A similar effect can be obtained by using a space in the crankcase, a space in the air cleaner, or the like.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a conceptual diagram of an evaporated fuel control device, FIG. 2 is a vertical cross-sectional view of the fuel outflow control device for a fuel reservoir according to the present invention, and FIG. 3 shows an inclined state. longitudinal section,
FIG. 4 is a longitudinal sectional view showing the operating state when fuel has entered up to the straight line '1-L1, and FIGS. 5 to 8 are longitudinal sectional views showing other embodiments. 1...Fuel tank (fuel reservoir), 2...
Evaporated fuel passage, 3...Fuel outflow control device, 4.
...Fuel vapor recovery device, 5...Scavenging passage,
6...Intake passage, 7°7at 7b*7
cv 7d"""case, 8, 8a...inlet pipe, 9...outlet pipe, 10...weight, 1
1... Valve body, 12... Valve seat, 13...
... Valve spring (elastic body), 14 ... Valve push rod, 15 ... Weight spring, 16 ... Passage,
17.17a... Cover 18... Weight holder.

Claims (1)

[Scope of utility model registration request] A fuel outflow control device is provided in the vaporized fuel passage leading from the fuel reservoir of the vehicle to the vaporized fuel recovery device, and the fuel outflow control device is movable up and down in a case provided with an inlet pipe at the bottom and an outlet pipe at the top. The weight has a built-in weight and a valve body that closes the outlet pipe when the weight rises.
6, and a valve pusher rod 14 protruding from the upper surface of the weight, which is inserted into the hollow part of the valve body 11 and engages with the valve body via the valve spring 13. .