JP2020029870A - Check valve built-in bolt and container having the same - Google Patents

Abstract

To provide a fuel tank having a check valve built-in bolt which prevents a mounting space of a check valve from increasing and further dispenses with a mounting step for a check valve.SOLUTION: A check valve built-in bolt 100 has a through hole 103 extending in its longitudinal direction. The through hole 103 accommodates a valve body 104 that opens and closes the through hole, a spring 106 that presses the valve body 104 in a direction of closing the valve body 104, and a set screw 108 that restricts movement of the spring 106. A fuel tank 500 includes a lid attachment tool 600 that is attached to an oil supply port of the fuel tank. The lid attachment tool 600 is attached to the fuel tank 500 with the check valve built-in bolt 100 and a nut 110.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a check valve built-in bolt, and more particularly to a container such as a fuel tank having a check valve built-in bolt.

  Conventionally, a diesel engine sucks light oil from a fuel tank at the time of combustion, and an air hole of several mm is formed in the fuel tank in order to eliminate a negative pressure due to the suction. During operation of an engine such as a diesel engine, heated fuel such as light oil always returns from the engine to the fuel tank at a certain timing, and the fuel in the fuel tank is heated by the heated fuel, and the internal pressure of the fuel tank increases. There are cases. The increased internal pressure was eliminated by air holes provided in the fuel tank. Such a return of the heated fuel to the fuel tank has been performed in order to prevent an excessive increase in the fuel temperature by the fuel injection pump of the engine and to prevent a decrease in the injection amount due to the expansion of the fuel. Alternatively, since the amount of fuel injected varies depending on the engine speed and conditions, the amount of fuel transferred to the engine by the fuel pump is kept constant, and the remaining fuel that has not been injected is returned to the fuel tank again. I was

  On the other hand, a fuel leak test when a vehicle falls over is added to the fuel leak prevention standard defined in the agreement rule on vehicle fire prevention (UN-R34) (Ministry of Land, Infrastructure, Transport and Tourism 2014 Vehicle Safety Measures Study Group, 2015 March 10th, Safety-Document 3-4). In this test, the fuel tank was attached to the test apparatus and rotated at 90 degrees, 180 degrees, and 270 degrees, respectively, and at that time, it was confirmed that there was no fuel leakage from the fuel tank.

  Patent Document 1 proposes a ventilation structure in which a check valve (a check valve) is provided in a fuel tank. The ventilation structure disclosed in Patent Literature 1 includes a fuel check valve in the middle of a communication pipe that communicates an air chamber above a fuel tank with atmospheric pressure to correct fluctuations in atmospheric pressure.

JP-A-57-138425

  According to UN-R34, it is necessary to prevent fuel leakage from the air holes of the fuel tank when the vehicle falls. Therefore, it is conceivable to provide a fuel tank with a ventilation structure provided with a check valve as disclosed in Patent Document 1. However, if the fuel tank is provided with a ventilation structure provided with the check valve of Patent Document 1, not only the mounting space increases, but also the manufacturing cost may increase due to an increase in the number of mounting steps and the like. Further, the check valve of Patent Document 1 can be opened to reduce the internal pressure to the atmospheric pressure when the internal pressure of the fuel tank is higher than the atmospheric pressure, but it is assumed that the internal pressure of the fuel tank is lower than the atmospheric pressure. Absent.

  Therefore, the present invention provides a check valve built-in bolt and a container (fuel tank) having the same, without significantly increasing the space for mounting the check valve and without providing a step of mounting the check valve itself. With the goal. In addition, an object of the present invention is to provide a check valve built-in bolt capable of adjusting the internal pressure to atmospheric pressure regardless of the internal pressure of the container, and a container having the same.

Each aspect of the present invention is configured as follows.
(Aspect 1)
A check valve built-in bolt,
Having a through hole extending in the longitudinal direction of the check valve built-in bolt,
The through hole accommodates a valve element that opens and closes the through hole, a pressing member that presses the valve element in a direction to close the valve element, and a restricting member that restricts movement of the pressing member. Check valve built-in bolt.
(Aspect 2)
The check valve built-in bolt according to Aspect 1,
The said restriction member has an air vent hole which penetrates the longitudinal direction of the said restriction member, The check valve built-in bolt characterized by the above-mentioned.
(Aspect 3)
The check valve built-in bolt according to aspect 1 or 2,
On the outer surface of the limiting member, a male screw is formed, and on the inner surface of the through-hole, a female screw is formed.The male screw and the female screw are engaged, so that the limiting member serves as the pressing member. A bolt with a built-in check valve, which restricts movement.

(Aspect 4)
The check valve built-in bolt according to any one of aspects 1 to 3,
The check valve built-in bolt, wherein the restricting member is capable of adjusting a pressing force of the pressing member by moving an engagement position of the male screw and the female screw.
(Aspect 5)
The check valve built-in bolt according to any one of aspects 1 to 4,
The through hole includes a first through portion that opens on a side opposite to a head of the check valve built-in bolt, a second through portion that opens on the side of the head, the first through portion, and the second through hole. A third penetrating portion provided between the penetrating portions,
The check valve built-in bolt, wherein the valve body and the urging member are accommodated in the third penetration portion, and the restriction member is fixed to the second penetration portion.
(Aspect 6)
The check valve built-in bolt according to any one of aspects 1 to 4,
The through hole includes a first through portion that opens on a side opposite to a head of the check valve built-in bolt, a second through portion that opens on the side of the head, the first through portion, and the second through hole. A third penetrating portion provided between the penetrating portions,
The check valve built-in bolt, wherein the valve body and the urging member are accommodated in the third penetration portion, and the restriction member is fixed to the first penetration portion.

(Aspect 7)
A container having the check valve built-in bolt according to any one of aspects 1 to 6,
The said check valve built-in bolt adjusts the pressure inside the said container to atmospheric pressure, The container characterized by the above-mentioned.
(Aspect 8)
A container having the check valve built-in bolt according to aspect 7,
The said container is a fuel tank, The container characterized by the above-mentioned.
(Aspect 9)
A container having the check valve built-in bolt according to Aspect 8,
The fuel tank is provided with a lid fitting, which is attached to a filler port of the fuel tank,
The container wherein the lid attachment is attached to the oil filler port by the check valve built-in bolt and nut.

(Aspect 10)
A container having the check valve built-in bolt according to aspect 9,
The container, wherein the lid attachment is attached to the fuel filler port by a plurality of the check valve built-in bolts and nuts.
(Aspect 11)
A container having the check valve built-in bolt according to aspect 10, wherein
A container, wherein at least one of the plurality of check valve built-in bolts opens when an internal pressure of the fuel tank is higher than atmospheric pressure.
(Aspect 12)
A container having the check valve built-in bolt according to aspect 10 or 11,
A container, wherein at least one of the plurality of check valve built-in bolts opens when an internal pressure of the fuel tank is lower than an atmospheric pressure.

  The present invention uses a check valve built-in bolt in place of a conventional bolt, thereby increasing the mounting space of the check valve and further reducing the check valve built-in bolt without providing a process for mounting the check valve itself. A container such as a fuel tank having the same can be provided.

FIG. 2A is a top view and FIG. 2B is an exploded cross-sectional view of the check valve built-in bolt according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view showing a state where the check valve built-in bolt of FIG. 1 is attached to a fuel tank. It is the (a) top view and the (b) exploded sectional view of the check valve built-in bolt concerning a 2nd embodiment of the present invention. FIG. 4 is a sectional perspective view of the check valve built-in bolt of FIG. 3. It is a sectional perspective view of a check valve built-in bolt concerning a 3rd embodiment of the present invention. It is (a) upper perspective view and (b) lower perspective view of the filler hole which has the check valve built-in bolt which concerns on 4th Embodiment of this invention. It is a notch lower perspective view which expanded the fuel filler of FIG. 6 (a). FIG. 7A is an upper perspective view, and FIG. 7B is a lower perspective view, with the fuel filler port of FIG. 6 closed.

  DETAILED DESCRIPTION OF THE INVENTION Embodiments relating to a check valve built-in bolt of the present invention and a fuel tank having the same will be described with reference to the drawings. In the drawings, corresponding portions are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

  As described in the related art, in consideration of the regulations (UN-R34) regarding fuel leakage from the fuel tank, it is required that the fuel tank be provided with air intake / exhaust air and that there be no fuel leakage from the tank. It is essential to clear these two required items. On the other hand, bolting has been used to unitize and attach a lid attachment having an openable / closable lid inside the fuel filler port of the fuel tank. In consideration of the requirements of UN-R34, a study was conducted on how to intake and exhaust air. As a result, a check valve built-in bolt having a check valve built into the bolt for assembling the lid fitting was introduced. . Hereinafter, the internal structure of this check valve built-in bolt and the mounting structure to the container (fuel tank) will be described.

(First embodiment)
A check valve built-in bolt 100 according to a first embodiment of the present invention and a fuel tank having the same will be described. As shown in FIG. 1, the check valve built-in bolt 100 has a check valve built in a bolt body 102 having a hexagonal bolt head 102a. The check valve built-in bolt 100 has a through hole 103 that penetrates the bolt main body 102 along the longitudinal direction (axial direction) of the bolt main body 102.

  The through hole 103 has a first through portion 103a having the smallest diameter and opening on the side opposite to the bolt head 102a, a second through portion 103b having the largest diameter and opening on the bolt head 102a side, and a first through portion 103a. And a third through-hole 103c provided between the second through-hole 103b. The diameter of the third through portion 103c is larger than the diameter of the first through portion 103a and smaller than the diameter of the second through portion 103b. A female screw is formed on the inner surface of the second through portion 103b. An annular receiving portion 103d which is inclined to receive the valve seat 105 is formed between the first through portion 103a and the third through portion 103c. As shown in FIG. 1B, from the second through portion 103b side, a valve seat 105, a ball 104, a compression coil spring (pressing member) 106, and a set screw (restriction member) formed of a flexible resin in a donut shape. 108 are accommodated in the through holes 103 in this order. The set screw 108 is a male screw, and has an air vent hole 108a penetrating along the longitudinal direction (axial direction). The valve seat 105, the ball 104, and the compression coil spring 106 are accommodated in the third penetration portion 103c in order from the bottom. A set screw 108 is fixed to the second penetration portion 103b.

  FIG. 2 is a cross-sectional view showing a state where the check valve built-in bolt 100 of FIG. A lid fitting 600 having a filler port lid is conventionally attached to a fuel filler port (lid fitting fixing plate 520) of the fuel tank 500 with a plurality of bolts and nuts. Then, at least one of the conventional bolts can be the check valve built-in bolt 100 of the first embodiment of the present invention, as shown in FIG. FIG. 2 does not show the fuel filler lid. As shown in FIG. 2, the check valve built-in bolt 100 is disposed in a fixing opening of the fuel tank 500 and the lid attachment 600. By screwing the nut 110 to the check valve built-in bolt 100, the fuel tank 500 and the container lid attachment 600 are fastened. 2 is the inside of the fuel tank 500. When the internal pressure of the fuel tank 500 rises, the ball 104 seated on the valve seat 105 moves upward against the pressing force of the compression coil spring 106, and the fuel The internal pressure of the tank 500 is released to the outside.

(Second embodiment)
A check valve built-in bolt 100A according to a second embodiment of the present invention will be described. As shown in FIGS. 3 and 4, the check valve built-in bolt 100A has a hexagon socket head bolt body 102A. The bolt main body 102A is configured similarly to the check valve built-in bolt 100 of FIGS. 1 and 2 except that the side surface of the bolt head 102a is cylindrical and a hexagonal hole 103e is formed in the bolt head 102a. ing. The fuel tank 500 and the lid attachment 600 in FIG. 2 can be fastened to the check valve built-in bolt 100A in the same manner as in the first embodiment.

(Third embodiment)
A check valve built-in bolt 100B according to a third embodiment of the present invention will be described. As shown in FIG. 5, the check valve built-in bolt 100B is different from the check valve built-in bolt 100 according to the first embodiment and the check valve built-in bolt 100A according to the second embodiment in that the check valve is released. The direction is reverse. As shown in FIG. 5, the check valve built-in bolt 100B includes a through hole 103B penetrating the bolt main body 102A along the longitudinal direction of the bolt main body 102B.

  The through-hole 103B has a first through-hole 103Ba having the largest diameter and opening on the side opposite to the bolt head 102a, a second through-hole 103Bb having the smallest diameter and opening toward the bolt head 102a, and a first through-hole 103Ba. And the third through-hole 103Bc provided between the second through-hole 103Bb. The diameter of the third through portion 103Bc is smaller than the diameter of the first through portion 103Ba and larger than the diameter of the second through portion 103Bb. A female screw is formed on the inner surface of the first through portion 103Ba. An annular receiving portion 103Bd that is inclined to receive the valve seat 105 is formed between the second through portion 103Bb and the third through portion 103Bc. The compression coil spring 106, the ball 104, and the valve seat 105 are accommodated in the third penetration portion 103Bc in order from the bottom. A set screw 108 is fixed to the first through portion 103Bb. The check tank built-in bolt 100 </ b> B can fasten the fuel tank 500 and the lid attachment 600 of FIG. 2 similarly to the first embodiment.

(Fourth embodiment)
A fuel tank having a pair of check valve built-in bolts according to a fourth embodiment of the present invention will be described. FIGS. 6 and 7 show a tubular fuel supply unit 510 attached to a fuel tank (not shown). A disc-shaped lid attachment fixing plate 520 having an opening is fixed to the inner surface of the refueling section 510 by welding or the like. The lid attachment 600 having the lid 700 is fixed to the lid attachment fixing plate 520 with a plurality of bolts and nuts. In the fourth embodiment, of the plurality of bolts, one bolt is the check valve built-in bolt 100A of the second embodiment, and the other bolt is the check valve built-in bolt 100B of the third embodiment. Things. 6 and 7 show a state in which the lid 700 is opened, and the check valve built-in bolt 100A and the check valve built-in bolt 100B are illustrated in cross-sectional views to show their internal structures. FIG. 8 shows a state where the lid 700 is closed. A plurality of arrows shown in FIGS. 6 and 7 indicate directions in which gas flows in a released state of the check valves incorporated in the check valve built-in bolt 100A and the check valve built-in bolt 100B.

  In the fourth embodiment of the present invention, when light oil heated from a diesel engine flows into a fuel tank, the internal pressure of the fuel tank may increase. In this case, when the internal pressure of the fuel tank exceeds a predetermined pressure defined in the check valve built-in bolt 100A, the check valve of the check valve built-in bolt 100A opens to allow the gas in the fuel tank to flow to the atmosphere. Thereby, the internal pressure becomes equal to the atmospheric pressure. Further, the fuel tank may be cooled and the internal pressure of the fuel tank may decrease. In this case, when the internal pressure of the fuel tank becomes lower than a predetermined pressure set for the check valve built-in bolt 100B, the check valve of the check valve built-in bolt 100B opens to allow the atmosphere to flow into the fuel tank, thereby causing the internal pressure to be reduced. Becomes equal to the atmospheric pressure. As a result, it is possible to prevent the fuel from flowing out when the vehicle falls, for example, while always keeping the pressure of the fuel tank from deviating significantly from the atmospheric pressure.

  The non-return valve built-in bolt according to the first to third embodiments of the present invention has a non-return valve built in a bolt body 102, 102A having a shape replaceable with a commercially available bolt. A through hole is made in a commercially available bolt in the axial direction, and a ball (steel ball) 104 and a spring 106 are charged into the through hole and fixed with a set screw 108. By attaching this bolt to the housing of the container, the fuel tank, or the like, the internal pressure and the external pressure can be adjusted, and the influence of the pressure on the container or the fuel tank can be suppressed.

  The check valve built-in bolts according to the first to third embodiments of the present invention are small, space-saving, and easy to mount. By replacing the existing bolts used for fuel tanks and the like with the check valve built-in bolts according to the first to third embodiments, the internal pressure of the container increases or decreases with respect to the atmospheric pressure simultaneously with the fastening of the components. A mechanism to circumvent can be provided.

As in the third embodiment of the present invention, the arrangement of the ball or spring, which is a component of the check valve, is attached to the bolt by changing the direction opposite to that of the second embodiment. It becomes possible. The check valve built-in bolts according to the first to third embodiments of the present invention are configured according to the standard of commercially available bolts, and commercially available nuts and washers can be used as they are. It can also be used by replacing it.
In the check valve built-in bolts according to the first to third embodiments of the present invention, the screwing position of the set screw 108 with respect to the bolt body is fixed, while the pressing force (shape of the spring) of the spring 106 is selected in advance. Thus, the relief pressure of the check valve can be set to an appropriate value. Alternatively, the check valve built-in bolt according to the first to third embodiments of the present invention can adjust the pressing force of the spring 106 by adjusting the screwing position of the set screw 108 with respect to the bolt body, Accordingly, the relief pressure of the check valve can be easily adjusted.

  In the first to third embodiments of the present invention, the check valve built-in bolt is described as having a built-in ball type check valve. However, the present invention is not limited to the one having a built-in ball type check valve. . For example, in each embodiment, a poppet-type check valve can be built in the check valve built-in bolt.

100, 100A, 100B Check valve built-in bolt 102, 102A Bolt body 103, 103B Through hole 104 Ball (valve element)
105 Valve seat (valve seat)
106 spring (pressing member)
108 Set screw (restriction member)
108a Air vent hole 500 Fuel tank 510 Refueling section 520 Lid mounting fixture plate 600 Lid mounting 700 Refueling port lid

Claims (12)

A check valve built-in bolt,
Having a through hole extending in the longitudinal direction of the check valve built-in bolt,
The through hole accommodates a valve element that opens and closes the through hole, a pressing member that presses the valve element in a direction to close the valve element, and a restricting member that restricts movement of the pressing member. Check valve built-in bolt. The check valve built-in bolt according to claim 1, wherein:
The said restriction member has an air vent hole which penetrates the longitudinal direction of the said restriction member, The check valve built-in bolt characterized by the above-mentioned. The check valve built-in bolt according to claim 1 or 2, wherein:
On the outer surface of the limiting member, a male screw is formed, and on the inner surface of the through-hole, a female screw is formed.The male screw and the female screw are engaged, so that the limiting member serves as the pressing member. A bolt with a built-in check valve, which restricts movement. The check valve built-in bolt according to any one of claims 1 to 3, wherein:
The check valve built-in bolt, wherein the restricting member is capable of adjusting a pressing force of the pressing member by moving an engagement position of the male screw and the female screw. The check valve built-in bolt according to any one of claims 1 to 4, wherein:
The through hole includes a first through portion that opens on a side opposite to a head of the check valve built-in bolt, a second through portion that opens on the side of the head, the first through portion, and the second through hole. A third penetrating portion provided between the penetrating portions,
The check valve built-in bolt, wherein the valve body and the urging member are accommodated in the third penetration portion, and the restriction member is fixed to the second penetration portion. The check valve built-in bolt according to any one of claims 1 to 4, wherein:
The through hole includes a first through portion that opens on a side opposite to a head of the check valve built-in bolt, a second through portion that opens on the side of the head, the first through portion, and the second through hole. A third penetrating portion provided between the penetrating portions,
The check valve built-in bolt, wherein the valve body and the urging member are accommodated in the third penetration portion, and the restriction member is fixed to the first penetration portion. A container having the check valve built-in bolt according to any one of claims 1 to 6,
The said check valve built-in bolt adjusts the pressure inside the said container to atmospheric pressure, The container characterized by the above-mentioned. A container having the check valve built-in bolt according to claim 7,
The said container is a fuel tank, The container characterized by the above-mentioned. A container having the check valve built-in bolt according to claim 8,
The fuel tank is provided with a lid fitting, which is attached to a filler port of the fuel tank,
The container wherein the lid attachment is attached to the oil filler port by the check valve built-in bolt and nut. A container having the check valve built-in bolt according to claim 9,
The container, wherein the lid attachment is attached to the fuel filler port by a plurality of the check valve built-in bolts and nuts. A container having the check valve built-in bolt according to claim 10,
A container, wherein at least one of the plurality of check valve built-in bolts opens when an internal pressure of the fuel tank is higher than atmospheric pressure. A container having the check valve built-in bolt according to claim 10 or 11,
A container, wherein at least one of the plurality of check valve built-in bolts opens when an internal pressure of the fuel tank is lower than an atmospheric pressure.