JP6790317B2 - Valve device - Google Patents

Description

The present invention relates to a valve device attached to a fuel tank of an automobile and used for a check valve, a cut valve, and the like.

Conventionally, the fuel tank of an automobile has a check valve for adjusting the pressure in the fuel tank, a cut valve for preventing the fuel in the fuel tank from leaking to the outside, and further preventing overfueling in the fuel tank. A full tank regulation valve, etc. is arranged.

Basically, these valves have a case with a large opening at one end, a lid that is fixed to the opening of the case by ultrasonic welding or vibration welding, and a lid that is fixed to the case inside. It has a structure having a valve body arranged in the formed valve chamber.

As conventional valves of this type, for example, in Patent Document 1 below, a valve case having two inlets and outlets provided opposite to each other and having a first valve seat formed at one inlet and outlet, and a valve case inside the valve case. A two-way valve having a first valve body and a second valve body arranged in the above is described. The valve case is composed of a case main body having a valve seat having a large opening at one end and a lid body fixed to the opening side of the case main body. Further, the lid body has a flange portion and an annular rib that is erected from the inner diameter side slightly from the outer peripheral edge portion of the flange and is inserted into the inner circumference of the case body. Then, the annular rib of the lid is inserted into the opening of the case body, the flange portion is brought into contact with the opening end portion of the case body, and the contact portion between the flange portion and the opening end portion of the case body and the annular rib portion are formed. By ultrasonically welding the wrap portion with the inner circumference of the case body, the lid body is fixed to the case body by welding.

Japanese Unexamined Patent Publication No. 2003-240143

In the case of the above-mentioned two-way valve, burrs are inevitably generated when the lid is welded to the case body. When this burr is discharged to the outside of the valve case, there is no particular problem, but the burr may enter the inside of the valve case. In this case, the burr may get caught in the valve seat of the valve case, and the sealability with the valve body may become a problem.

Therefore, an object of the present invention is to provide a valve device capable of restricting burrs generated during welding of the first member and the second member constituting the housing from entering the valve chamber in the housing. ..

In order to achieve the above object, the valve device of the present invention has a first member and a second member, and the second member is integrated with the first member by welding to provide a valve chamber and a valve seat inside. It has a provided housing and a valve body arranged in the valve chamber to open and close the valve seat, and is arranged so as to face each other on the outer periphery of the first member and the outer periphery of the second member. A first joint portion and a second joint portion to be joined by welding are formed respectively, an annular concave portion is formed in the first joint portion, and an annular convex portion inserted into the annular concave portion is formed in the second joint portion. The outer wall portion is arranged on the outer diameter side of the annular recess, the inner side wall portion is arranged on the inner diameter side of the annular recess, and the annular convex portion is inserted into the annular recess. It is welded to the outer side wall portion and is arranged apart from the inner side wall portion to form a passage communicating with the valve chamber. In the middle of the passage, the annular recess and the annular convex An annular restricting member is arranged between the portions to prevent welding burrs generated when the annular convex portion is welded to the outer wall portion from entering the valve chamber.

According to the present invention, the annular recess and the annular recess formed by inserting the annular convex portion formed in the second joint into the annular recess of the first joint are in the middle of the passage communicating with the valve chamber. Since an annular restricting member is arranged between the annular protrusions, it is possible to prevent welding burrs generated when the annular protrusions are welded to the outer wall of the annular recess from entering the valve chamber of the housing. it can.

It is an exploded perspective view which shows one Embodiment of the valve device which concerns on this invention. It is an enlarged perspective view of the 1st member constituting the valve device. It is a top view of the 2nd member which comprises the valve device. It is sectional drawing in the state before welding of a 1st member and a 2nd member in the valve device. It is an enlarged sectional view in the range E1 of FIG. It is sectional drawing in the state in which the 1st member and the 2nd member are welded and integrated in the valve device. It is an enlarged sectional view in the range E2 of FIG. It shows another embodiment of the valve device which concerns on this invention, and is sectional drawing in the state before welding of a 1st member and a 2nd member. It is an enlarged sectional view in the range E3 of FIG. It is sectional drawing in the state in which the 1st member and the 2nd member are welded and integrated in the valve device. It is an enlarged sectional view in the range E2 of FIG.

Hereinafter, an embodiment of the valve device according to the present invention will be described with reference to FIGS. 1 to 7.

As shown in FIGS. 1 and 4, the valve device 10 in this embodiment has a first member 20 and a second member 40, and the second member 40 is integrated with the first member 20 by welding and inside. It has a housing 15 provided with a valve chamber V and a valve seat 24, and a valve body 80 arranged in the valve chamber V to open and close the valve seat 24. Further, on the outer circumference of the first member 20 and the outer circumference of the second member 40, a first joint portion 30 and a second joint portion 50, which are arranged to face each other and are joined by welding, are formed.

As shown in FIG. 1, the first member 20 in this embodiment has a cylindrical peripheral wall 21 and a ceiling wall 22 arranged above the peripheral wall 21, one of which is closed and the other of which is closed. It has an open cylindrical case shape. Further, as shown in FIG. 4, an opening 22a communicating with the valve chamber V is formed in the center of the ceiling wall 22, and is connected to a pipe arranged in the fuel tank from the outer peripheral edge of the opening 22a. The first connection pipe 23 for connection is extended. Further, as shown in FIG. 4, a cylindrical valve seat 24 is projected from the inner surface side (the side facing the valve chamber V) of the ceiling wall 22 and from the outer periphery of the opening 22a. The valve body 80 is brought into contact with and separated from the valve seat 24 to open and close the valve seat 24.

Then, as shown in FIGS. 1, 2 and 4, the first joint portion 30 is provided so as to form a flange shape in the outer diameter direction from the peripheral edge portion on the lower opening side of the peripheral wall 21. There is. As shown in FIGS. 2 and 4, the first joint portion 30 is formed with an annular recess 31 having an annular groove shape at a predetermined depth. Further, as shown in FIG. 5, an outer wall portion 32 is arranged on the outer diameter side of the annular recess 31, and an inner side wall portion 33 is arranged on the inner diameter side of the annular recess 31. As shown in FIG. 4, the inner side wall portion 33 projects so as to be longer than the tip of the outer wall portion 32.

Further, on the inner circumference of the annular recess 31 on the outer wall portion 32 side, a welded portion 34 having a tapered surface shape that gradually expands in diameter toward the lower opening end of the first member 20 is provided. Further, a pressure welding portion 59, which will be described later, of the second joint portion 50 is pressure-welded to the inner circumference 31b of the annular recess 31 at a position adjacent to the welding portion 34 (see FIGS. 5 and 7). Further, a stepped portion 35 projecting in a stepped manner is projected from the inner circumference of the annular recess 31 on the inner side wall portion 33 side, and an annular regulating member described later is supported by the stepped portion 35.

The first member is not limited to the above shape. Further, the first joint portion is not limited to the above shape, and is not particularly limited as long as it has a shape having an annular recess, an outer wall portion, and an inner side wall portion.

Next, the second member 40 will be described. The second member 40 of this embodiment has a lid 41 having a substantially disk shape. An opening 41a is formed in the center of the lid 41, and a second connecting pipe 43 for connecting to a pipe communicating with a canister or the like outside the fuel tank extends from the outer peripheral edge of the opening 41a. Has been done. Further, a spring support seat 45 having an annular rib shape is projected on the inner surface side of the lid 41 and on the outer periphery of the opening 41a, and the valve body 80 is placed on the valve seat 24 side of the housing 15. A spring 85 is supported for urging towards.

Then, a second joint portion 50 to be joined to the first joint portion 30 by welding is provided at a position of the outer peripheral edge portion on the inner surface side of the lid body 41 facing the first joint portion 30. There is. An annular convex portion 51, which is inserted into the annular concave portion 31 of the second joint portion 50, is projected from the side of the second joint portion 50 facing the first joint portion 30. ..

As shown in FIGS. 5 and 7, the annular convex portion 51 is inserted into the annular concave portion 31 of the first member 20, welded to the outer wall portion 32 thereof, and separated from the inner side wall portion 33. It is arranged so that a passage 60 communicating with the valve chamber V is formed.

Further, the annular convex portion 51 in this embodiment includes an inner diameter side rib 53, an outer diameter side rib 55 arranged on the outer diameter side of the housing with respect to the inner diameter side rib 53, an inner diameter side rib 53, and an outer diameter side rib 55. It has a burr accumulation space 57 formed between the two. The inner diameter side rib 53 and the outer diameter side rib 55 both form a double annular shape protruding in an annular shape, and the burr accumulation space 57 between them also has an annular concave groove shape (see FIG. 1). Further, as shown in FIG. 5, the inner diameter side rib 53 projects so as to be longer than the tip of the outer diameter side rib 55.

Further, as shown in FIGS. 5 and 7, the outer diameter of the inner diameter side rib 53 is formed to be smaller than the inner diameter of the inner circumference 31b of the annular recess 31, and the inner diameter is inside the first joint portion 30. It is formed larger than the outer diameter of the wall portion 33 and the step portion 35. As a result, the inner diameter side rib 53 can be inserted between the inner circumference 31b of the annular recess 31 and the step portion 35, and the passage 60 can be formed between the inner side wall portion 33.

Further, the outer diameter side rib 55 is formed at a position suitable for the welded portion 34 of the annular recess 31, and as shown in FIG. 7, the outer diameter side rib 55 is ultrasonically welded to the welded portion 34. The first joint portion 30 and the second joint portion 50 are joined to each other by welding by vibration welding or the like.

Further, as shown in FIGS. 1 and 3, a predetermined peripheral surface of the annular convex portion 51 facing the outer peripheral side, in this embodiment, on the outer periphery of the inner diameter side rib 53 constituting the annular convex portion 51 in the circumferential direction. A plurality of pressure welding portions 59 are provided at predetermined intervals (here, four). As shown in FIGS. 5 and 7, the pressure contact portion 59 of this embodiment has a ridge extending in the axial direction of the housing 15 from the bottom surface of the burr accumulation space 57 to the tip of the inner diameter side rib 53 in the protruding direction. There is. When the annular convex portion 51 is inserted into the annular recess 31, each pressure contact portion 59 is pressed against the inner circumference 31b of the annular recess 31. Here, the pressure contact portion 59 having a ridge is pressed into the inner circumference 31b of the annular recess 31 so as to bite into the inner circumference 31b (see FIGS. 5 and 7).

Further, as shown in FIGS. 5 and 7, an annular shape is formed on the inner surface side of the lid 41 on the inner diameter side of the inner diameter side rib 53 and at a position facing the inner side wall portion 33 of the annular recess 31. A concave groove 62 having a concave groove shape is formed. The concave groove 62 communicates with the passage 60 and the valve chamber V.

The second member is not limited to the above shape. Further, the second joint portion is not limited to the above shape, and is not particularly limited as long as it has an annular convex portion and can form the passage. Further, in the case of this embodiment, the pressure contact portion is provided on the outer periphery of the inner diameter side rib 53 of the annular convex portion 51, but the pressure contact portion is pressed against the inner circumference of the annular recess when it is inserted into the annular recess. It is not particularly limited as long as it is provided on the peripheral surface facing the outer peripheral side of the annular convex portion so as to be possible.

Further, in the valve device 10 of this embodiment, the first member 20 has a tubular case shape and the second member 40 has a lid shape that closes the opening of the tubular case, but the second member has a tubular case shape. The first member may have a lid shape, and the first member and the second member may have a half-split cup shape or the like, and are not particularly limited.

Then, as shown in FIGS. 5 and 7, in the valve device 10, the outer wall portion 32 of the annular convex portion 51 is located between the annular concave portion 31 and the annular convex portion 51 in the middle of the passage 60. Welding burr B (see FIG. 7) generated at the time of welding to (here, when the outer diameter side rib 55 of the annular convex portion 51 is welded to the welding portion 34 of the annular concave portion 31) invades the valve chamber V. An annular regulating member is arranged to regulate the operation.

The annular restricting member in this embodiment is made of rubber or the like, which is elastically contacted with the peripheral surface of the inner side wall portion 33 of the annular recess 31 on the outer diameter side of the housing and the peripheral surface of the inner diameter side rib 53 of the annular convex portion 51 on the inner diameter side of the housing. The annular sealing member 70 is made of an elastic material such as an elastic elastomer. The annular restricting member may be not only an annular sealing member 70 made of an elastic material but also a coil spring or the like (this will be described in the embodiment described later), and has an annular shape and is welded burr B. As long as the intrusion into the valve chamber V can be regulated, there is no particular limitation.

Further, as shown in FIGS. 1, 4 and 6, the valve body 80 arranged in the valve chamber V has a substantially hat shape in the case of this embodiment, and the valve seat 24 is on the upper surface side thereof. It has a structure in which a first seal portion 81 for opening and closing is arranged. Further, on the inner diameter side of the first seal portion 81, a through hole 84 and an annular rib 83 are formed, and a second seal portion 82 for opening and closing the annular rib 83 is arranged.

Then, as shown in FIG. 4, the valve body 80 is constantly urged toward the valve seat 24 side by the spring 85, the valve seat 24 is closed by the first seal portion 81, and the tank internal pressure rises. As a result, the fuel vapor flowing into the valve chamber V from the first connecting pipe 23 is pushed against the urging force of the spring 85, so that the first seal portion 81 opens from the valve seat 24 to release the fuel vapor. 2 Let it escape from the connecting pipe 43 to the canister side. On the other hand, when the tank internal pressure drops, the air sucked from the second connecting pipe 43 into the valve chamber V passes through the through port 84 and other through openings (not shown), and passes through the annular rib 83 to the second seal portion 82. Since it is opened so as to be rolled up, air flows into the tank through the first connecting pipe 23, and the pressure inside the tank is adjusted. That is, the valve body 80 in this embodiment is a check valve that adjusts the internal pressure of the fuel tank.

However, the valve body structure of this valve device may be used not only for the check valve but also for, for example, a cut valve, a fuel full tank regulation valve, and the like. That is, the structure of the valve body is not particularly limited as long as the valve device has a housing and a valve body.

Next, the operation and effect of the valve device 10 of the present invention having the above configuration will be described.

That is, an example of a welding method of the first member 20 and the second member 40 will be described. First, a welding jig (not shown) is set so that the opening side of the first member 20 faces upward. Next, the annular seal member 70, which is an annular restricting member, is arranged on the outer periphery of the inner side wall portion 33 of the annular recess 31 of the first joint portion 30. After that, the annular convex portion 51 of the second member 40 is inserted into the annular concave portion 31 of the first member 20.

Then, the pressure contact portions 59 of the plurality of ridges provided on the outer periphery of the inner diameter side rib 53 of the annular convex portion 51 are pressure-welded so as to bite into the inner circumference 31b of the annular recess 31 (see FIG. 5). The first member 20 can temporarily hold the second member 40 in a posture in which the axis of the second member 40 is substantially aligned with the axis of the member 20 (see FIG. 4).

In this state, the outer diameter side rib 55 of the annular convex portion 51 is pressed against the welded portion 34 of the annular concave portion 31 and melted by ultrasonic welding, vibration welding, or the like to form the outer diameter side rib 55 and the welded portion 34. Is welded through the welded portion M. As a result, the first joint portion 30 and the second joint portion 50 are joined to each other by welding, and the first member 20 and the second member 40 can be integrated (see FIG. 6).

Then, in the process of welding the outer diameter side rib 55 and the welded portion 34, a weld burr B is generated. At this time, in the valve device 10, the annular recess 31 and the annular protrusion 51 are formed in the middle of the passage 60 communicating with the valve chamber V, which is formed by inserting the annular protrusion 51 into the annular recess 31. Since the annular seal member 70, which is an annular restricting member, is arranged between them, it is possible to restrict the welding burr B from entering the valve chamber V (see FIG. 7). As a result, it is possible to prevent the weld burr B from getting caught between the valve seat 24 and the first seal portion 81, for example, and maintain the sealing property between the valve body 80 and the valve seat 24. Can be done.

Further, in this embodiment, as shown in FIG. 7, the annular convex portion 51 has a burr accumulation space 57 formed between the inner diameter side rib 53 and the outer diameter side rib 55. Welding burrs B generated during welding of the first joint portion 30 and the second joint portion 50 can be accumulated in the burr accumulation space 57, and the welding burrs B can be prevented from entering the valve chamber V of the housing 15. Can be effectively regulated.

Further, in this embodiment, since the annular restricting member is the annular sealing member 70 made of an elastic material, the annular restricting member can have a simple structure. Further, since the annular seal member 70 is elastically contacted with the peripheral surface of the inner side wall portion 33 of the annular recess 31 on the outer diameter side of the housing and the peripheral surface of the inner diameter side rib 53 of the annular convex portion 51 on the inner diameter side of the housing, the annular recess It is possible to prevent the annular seal member 70 from rattling when the welded portion 34 of the outer wall portion 32 of 31 and the outer diameter side rib 55 of the annular convex portion 51 are welded, and as a result, the outer wall portion It is possible to make it difficult to affect the welded portion M between the 32 and the annular convex portion 51 (if there is rattling or vibration during welding, the welded surface may be roughened or the like). Further, since the passage 60 communicating with the valve chamber V of the housing 15 is reliably blocked by the annular seal member 70, it is possible to more reliably prevent the welding burr B from entering the valve chamber V.

Further, in this embodiment, as described above, the annular recess 31 is formed on a predetermined peripheral surface of the annular convex portion 51 facing the outer peripheral side, here, on the outer periphery of the inner diameter side rib 53 constituting the annular convex portion 51. A pressure contact portion 59 is formed which is pressed against the inner circumference 31b of the annular recess 31 when inserted into the annular recess 31, and the annular recess 31 is provided with a step portion 35 protruding stepwise from the inner side wall portion 33 to provide an annular seal. The member 70 is supported by the step portion 35.

Therefore, when the annular convex portion 51 is inserted into the annular concave portion 31, the pressure contact portion 59 formed on the outer periphery of the inner diameter side rib 53 of the annular convex portion 51 is pressed against the inner peripheral 31b of the annular concave portion 31. As shown by the arrow F1 of 5, the rib 53 on the inner diameter side of the annular convex portion 51 is pushed toward the inner diameter side of the housing, so that the frictional force between the annular seal member 70 and the annular convex portion 51 increases. As a result, as shown by the arrow F2 in FIG. 5, the annular convex portion 51 is inserted into the annular recess 31 while moving the annular seal member 70 toward the step portion 35 side of the annular recess 31. The annular seal member 70 can be reliably brought into contact with the step portion 35 to support it (see FIG. 7). As a result, the annular seal member 70 that is elastically contacted with the peripheral surface of the inner side wall portion 33 of the annular recess 31 on the outer diameter side of the housing and the peripheral surface of the inner diameter side rib 53 of the annular convex portion 51 on the inner diameter side of the housing is further stepped. It can also be brought into contact with the portion 35 to seal the housing 15 on one side in the inner diameter direction, the outer diameter direction, and the axial direction, for a total of three surfaces, and the intrusion of the welding burr B into the valve chamber V is more reliably regulated. Can be done (see FIG. 7).

8 to 11 show other embodiments of the valve device according to the present invention. The same parts as those in the above embodiment are designated by the same reference numerals, and the description thereof will be omitted.

The valve device 10A of this embodiment has a different configuration of the annular restricting member from that of the embodiment.

That is, the annular restricting member in this embodiment is composed of a coil spring 70A formed by winding a wire rod 71, and is between the inner end surface 31c of the annular recess 31A and the inner end surface 51b on the base side of the annular convex portion 51A. It is supported in a compressed state (see FIG. 9). Here, as shown in FIG. 9, one end of the coil spring 70A is supported by the inner end surface 31c of the annular recess 31A, and the other end is the base side of the annular convex portion 51A and the inner end surface on the inner diameter side of the housing. It is supported by 51b, and a gap is provided between adjacent wire rods 71 and 71 in a state before welding the first joint portion 30 and the second joint portion 50. In the coil spring 70A, the first member 20 and the second member 40 are welded and integrated, and the adjacent wire rods 71 and 71 are in close contact with each other (see FIG. 11).

The annular recess 31A is configured so that the step portion 35 of the annular recess 31 in the embodiment is not provided, and the annular convex portion 51A is the inner diameter side rib 53 of the annular convex portion 51 in the embodiment. The structure is such that the diameter side rib 55 and the burr accumulation space 57 are not provided, and the structure is simplified as compared with the above-described embodiment.

In this embodiment, the annular restricting member is a coil spring 70A formed by winding a wire rod 71 at a predetermined interval, and is formed by winding the wire rod 71 at a predetermined interval. The inner end surface 31c of the annular recess 31A and the base side of the annular convex portion 51A. Since it is supported in a compressed state with the inner end surface 51b of the ring, the influence of welding between the outer wall portion 32 (here, the welded portion 34) of the annular recess 31A and the annular convex portion 51A (effect of ultrasonic waves or heat). It is possible to make it difficult to receive, and it is possible to effectively regulate the invasion of the weld burr B into the valve chamber V.

Further, in this embodiment, in the coil spring 70A, the first member 20 and the second member 40 are welded and integrated, and the adjacent wire rods 71 are in close contact with each other (see FIG. 11). , The invasion of the weld burr B into the valve chamber V can be more effectively regulated.

Further, the present invention is not limited to the above-described embodiments, and various modified embodiments are possible within the scope of the gist of the present invention, and such embodiments are also included in the scope of the present invention. ..

10, 10A Valve device 15 Housing 20 1st member 24 Valve seat 30 1st joint 31, 31A Circular recess 31b Inner circumference 31c Inner end surface 32 Outer side wall 33 Inner side wall 34 Welding part 35 Step part 40 Second member 50 2nd joint 51, 51A Circular convex portion 51b Inner end surface 53 Inner diameter side rib 55 Outer diameter side rib 57 Burr accumulation space 59 Pressure welding part 60 Passage 70 An annular seal member 70A Coil spring 71 Wire rod 80 Valve body V Valve chamber

Claims (6)

A housing having a first member and a second member, the second member being integrated with the first member by welding, and a valve chamber and a valve seat provided inside.
It has a valve body that is arranged in the valve chamber and opens and closes the valve seat.
A first joint portion and a second joint portion, which are arranged to face each other and are joined by welding, are formed on the outer periphery of the first member and the outer periphery of the second member, respectively.
An annular recess is formed in the first joint portion, and an annular convex portion to be inserted into the annular recess is formed in the second joint portion.
The outer wall portion is arranged on the outer diameter side of the annular recess, and the inner side wall portion is arranged on the inner diameter side of the annular recess.
The annular convex portion is inserted into the annular concave portion and welded to the outer wall portion, and is arranged apart from the inner side wall portion to form a passage communicating with the valve chamber.
In the middle of the passage, between the annular concave portion and the annular convex portion, an annular shape that regulates welding burrs generated when the annular convex portion is welded to the outer wall portion from entering the valve chamber. A valve device in which a regulating member is arranged. The annular convex portion is a burr accumulation space formed between the inner diameter side rib, the outer diameter side rib arranged on the outer diameter side of the housing with respect to the inner diameter side rib, and the inner diameter side rib and the outer diameter side rib. The valve device according to claim 1, which has the above. The valve device according to claim 1 or 2, wherein the annular restricting member is an annular sealing member made of an elastic material that comes into contact with the peripheral surface of the inner wall surface of the annular recess and the peripheral surface of the annular convex portion. .. On the predetermined peripheral surface of the annular convex portion facing the outer peripheral side, a pressure contact portion that is pressed against the inner circumference of the annular recess when inserted into the annular recess is formed.
The valve device according to claim 3, wherein the annular recess is provided with a step portion that projects stepwise from the inner side wall portion, and the annular seal member is supported by the step portion. The annular regulating member comprises a coil spring formed by winding a wire rod, and is supported in a compressed state between the inner end surface of the annular recess and the inner end surface of the annular convex portion on the base side. Or the valve device according to 2. The valve device according to claim 5, wherein the coil spring is in a state where the first member and the second member are welded and integrated, and the adjacent wire rods are in close contact with each other.

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