JPS6318491Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a cap attached to an automobile fuel tank.

[Prior Art] Conventionally, this type of fuel tank cap has been equipped with a negative pressure valve mechanism or a pressurizing valve mechanism to isolate the atmosphere side from the tank side and keep the pressure inside the tank constant. It consists of a cap body provided with a regulating valve, and a lid body attached to the cap body via a ratchet mechanism and a torque control mechanism,
It can be attached to the fillet neck of the fuel tank by screwing a threaded portion provided on the outer periphery of the cap body.

In order to reduce the weight, the cap body has been made of synthetic resin, as disclosed in, for example, US Pat. No. 3,937,357.

[Problem that the invention attempts to solve]

However, if a fuel tank cap is made entirely of synthetic resin, it is relatively vulnerable to mechanical shock, and there is a risk that it will crack due to impact such as a car collision, and the fuel in the tank may leak from here. Ta.

Furthermore, since the fillet neck is usually made of metal, there is a risk that the threaded portion of the cap body will wear out when the cap is attached or removed, which may impair the sealing performance of the fillet neck. Furthermore, the location where the fuel tank is installed has a large temperature difference, so the thermal expansion coefficients of metal and synthetic resin are significantly different, making it difficult to thread the threaded parts of the two together as designed. , there is a possibility that the tightening torque may change.

Therefore, it is necessary to use an expensive synthetic resin with wear resistance, which increases the cost and limits material selection.

[Purpose of invention]

The present invention was devised to solve these conventional problems, and its purpose is to create a fuel that does not crack due to shocks such as automobile collisions, has good sealing performance, and does not fluctuate in tightening torque. Our goal is to provide tank caps.

[Means for solving problems]

The fuel tank cap according to the present invention has a cylindrical shape, has a threaded part on the outer periphery that is screwed onto the metal fillet neck of the fuel tank, has a flange on the upper part to which the lid is attached, and has a ratchet on the flange. A synthetic resin cap body with teeth that make up the mechanism, a pressure regulating valve installed inside, and a threaded part for torque control on the internal upper peripheral wall, and a ratchet mechanism installed on the flange of the cap body. A cap for a fuel tank, which is provided with teeth that engage with the teeth of the cap body, and a threaded portion that engages with a threaded portion for torque control provided on the inner circumference of the cap body, and a lid body that is attached to the cap body. In this case, the cap body has a flange, teeth for the ratchet mechanism, and a threaded part for torque control, and also includes a bottomed synthetic resin container with a flow hole in the bottom, and a metal fillet neck of the fuel tank. It consists of a metal cylindrical body that is provided with a threaded part and attached to the outer periphery of this bottomed synthetic resin container,
Moreover, a pressure regulating valve is inserted between the bottomed synthetic resin container and the metal cylinder.

[Effect of invention]

In this invention, since the threaded part of the cap body is made of metal, it will not crack when the car receives an impact such as a collision, unlike synthetic resin, and will prevent the fuel tank fillet from being blocked. maintain.

Further, when the cap is attached and detached, since metals are screwed together, only the threaded portion of the cap body will not be worn out, and the sealing performance will be maintained.

Furthermore, when subjected to thermal expansion, the threaded portion of the cap body and the metal fillet neck expand in substantially the same manner, so that torque fluctuations do not occur during tightening.

[Embodiment of the invention] Hereinafter, an embodiment of the invention will be described based on FIG.

In the figure, 1 is a cap body, which is composed of a bottomed synthetic resin container 2 and a metal cylindrical body 3.

The bottomed synthetic resin container 2 has a substantially U-shaped cross section, and has an outwardly projecting flange 21 at its top.
This flange 21 is provided with teeth 22 on its lower surface that mesh with teeth 53 forming a ratchet mechanism provided on the lid body 5. Further, a threaded portion 23 for torque control is formed on the inner wall surface, and a flow hole 24 is provided at the bottom. Further, a boundary portion 25 between the flange portion 21 and a portion where the torque control screw portion 23 is formed is bent into a substantially L-shaped cross section.

The metal cylindrical body 3 has a substantially U-shaped cross section, and is provided with a threaded portion 31 that engages with a screw 62 provided on a metal fillet neck 61 of the fuel tank 6. attached to the outer periphery of the The upper part of the threaded part 31 is bent into a substantially L-shape along the boundary part 25 of the bottomed synthetic resin container 2 to form a recess 32 in which the O-ring 7 is attached. Further, an opening 34 having a larger diameter than the negative pressure valve 44 of the pressure regulating valve 4 is formed in the bottom portion 33 .

In the cap body 1 configured in this way,
A pressure regulating valve 4 and a lid body 5 made of synthetic resin are attached.

The pressure regulating valve 4 has a pressurizing valve 41 and a negative pressure valve 44, and includes a bottomed synthetic resin container 2 and a metal cylinder 3.
It is installed between. The pressurizing valve 41 is placed on the bottom part 33 of the metal cylinder 3, and the pressurizing valve 41
A pressure spring 42 is disposed between the bottom 26 of the bottomed synthetic resin container 22, and the pressure valve 41 is connected to the pressure spring 4.
2 to the bottom 33 of the metal cylinder 3. A hole 43 provided in the center of the pressurizing valve 41
, the negative pressure valve 44 is located on the tank 6 side, and the shaft 45 to which the negative pressure valve 44 is attached penetrates, and the shaft 45 and the pressurizing valve 41 are connected on the bottomed synthetic resin container 2 side. A negative pressure spring 46 is attached to.

The lid body 5 made of synthetic resin has a cup-like shape with a U-shape in cross section, has a grip portion 51 in its center, and teeth 53 forming a ratchet mechanism on the opening 52 side. Inside, a plurality of protrusions 5 are provided with threaded portions 55 that engage with threaded portions 23 for torque control provided on the inner wall surface of the bottomed synthetic resin container 2.
4 are provided.

Next, the effects of this embodiment configured as described above will be explained.

When the pressure within the tank 6 is maintained at a predetermined value, the pressure regulating valve 4 isolates the interior of the tank 6 from the atmosphere. When the inside of the tank 6 is pressurized, the pressure acts on the pressure valve 41, and when it exceeds a predetermined value, the pressure valve 41 is pushed up against the pressure spring 42, and the pressure is released into the opening 34.
from the tank 6 through the circulation hole 24 to the outside.
When the internal pressure becomes constant, the pressurizing valve 41 closes the opening 34 again by the pressurizing spring 42, and the pressure inside the tank 6 is kept constant. On the other hand, when the pressure inside the tank 6 falls below a predetermined value, the pressure acts on the negative pressure valve 44, causing the negative pressure valve 44 to contract while contracting the negative pressure valve 46.
is drawn to the tank 6 side, and the atmosphere is passed through the circulation holes 24 and 4.
3. When the pressure is introduced into the tank 6 through the opening 34 and the pressure inside the tank 6 is unified, the negative pressure valve 44 closes the hole 43 by the negative pressure spring 46 to keep the pressure inside the tank 6 constant. do.

The fuel tank cap according to this embodiment is attached to the metal fillet neck 61 of the fuel tank 6 by screwing together the threaded portions 31 and 62 of the two. At this time, both threaded parts 31, 5
Since 2 is made of metal, there is no problem that either one of them will wear out due to their screw engagement.

Furthermore, even if there is a temperature difference between the fillet neck 6 and the cap body 1, since both are metal, their coefficients of thermal expansion are almost the same, and the meshing part with the fillet neck 61 will not shift like a synthetic resin cap body. , the problem of torque fluctuation is resolved.

In the state shown in FIG. 1, if a shock is received due to a car collision, for example, since the threaded portion 31 is made of metal, there is no risk of cracking, and the inside and outside of the tank 6 are connected. It is reliably shut off and the airtightness inside the tank 6 is maintained. Therefore, fuel leakage can be prevented.

Furthermore, since the part that covers the O-ring 7 is made of metal, even if it is subjected to impact such as a collision,
The O-ring 7 is held securely, and the problem of fuel leaking from this part does not occur.

Furthermore, in the present invention, since the cap body 1 is composed of a synthetic resin container 2 with a bottom and a metal cylinder 3, the threaded portion 31 can be processed reliably, and it can be easily processed like a synthetic resin member. This also eliminates the problem of accuracy errors.

[Effect of idea]

As described above, according to the present invention, since the part of the cap that is subjected to the load is made of metal, the cap as a whole is still light and strong, and cracks do not occur due to impact such as a car collision. It disappears.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention. 1... Cap body, 2... Bottomed synthetic resin container, 21... Flange, 22, 53... Teeth for ratchet mechanism, 23, 55... Threaded part for torque control, 24... Distribution hole , 26, 33...bottom,
3...Metal cylindrical body, 31, 62...Threaded part, 3
4, 43...Opening, 4...Pressure regulating valve, 41...
Pressure valve, 44...Negative pressure valve, 5...Synthetic resin lid, 54...Protrusion, 6...Fuel tank, 61...
Firanetsk, 7...O-ring.

Claims (1)

[Scope of utility model registration request] It has a cylindrical shape, has a threaded part on the outer periphery that is screwed onto the metal fillet neck of the fuel tank, has a flange on the top for attaching the lid, has teeth forming a ratchet mechanism on this flange, and has a A synthetic resin cap body is equipped with a pressure regulating valve and has a threaded portion for torque control on the internal upper circumferential wall, and teeth that mesh with the teeth of a ratchet mechanism provided on the flange of the cap body are provided. In a fuel tank cap, the cap body has a flange, a lid attached to the cap body, and a screw portion that engages with a torque control screw portion provided on the inner periphery of the cap body. A bottomed synthetic resin container has teeth for the ratchet mechanism and a threaded part for torque control, and has a flow hole in the bottom, and a threaded part that screws into the metal fillet neck of the fuel tank. It is composed of a metal cylindrical body attached to the outer periphery of a synthetic resin container with a bottom, and a pressure regulating valve is inserted between the bottomed synthetic resin container and the metal cylindrical body. Features a fuel tank cap.