JP2016133132A - Check valve and check valve structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a check valve capable of keeping airtightness at the extremity end side of an umbrella-shaped part of the check valve for a long period of time.SOLUTION: A check valve of this invention is a check valve 2 attached to a plate-like part 3 so as to prevent reverse flow of fluid at a passage hole 6 formed to pass through the plate-like part and the check valve comprises: a column-like part 21 that can be inserted into and passed through a supporting hole 5 formed to pass through the plate-like part; an engagement part 22 provided at an upper end side of the column-like part and having a larger outer diameter than a hole diameter of the supporting hole; an umbrella-shaped part 23 that can be press contacted with the lower surface of the plate-like part at the extremity end thereof to extend from the lower end part of the column-like part in a slant upward direction and in a centrifugal direction to cover the passage hole; and a press-contacted part 24 that can be press contacted with the lower surface of the plate-like part to hold the plate-like part between itself and the engagement part. Further, between the column-like part 21 and the press-contacted part 24 is formed an annular groove 27 recessed downward to enclose the outer circumference of the column-like part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a check valve and a check valve structure, and more particularly, to a check valve and a check valve structure for preventing a back flow of fluid in a passage hole that is attached to a plate-like portion and formed through the plate-like portion.

  As a conventional check valve, a valve that is attached to a plate-like portion and prevents a fluid from flowing back through a passage hole formed through the plate-like portion is generally known (see, for example, Patent Document 1). In this check valve 102, for example, as shown in FIG. 5, a columnar part 121 that can be inserted into a support hole 105 penetratingly formed in the plate-like part 103 and an upper end side of the columnar part 121 are provided. A locking part 122 having an outer diameter larger than the hole diameter, and an umbrella-like part that extends obliquely upward in the centrifugal direction from the lower end side of the columnar part 121 and whose tip side can be pressed against the lower surface of the plate-like part 103 so as to cover the passage hole 106 123 and a pressure contact portion 124 that is raised from the upper surface side of the umbrella-shaped portion 123 and that can be pressed against the lower surface of the plate-shaped portion 103 so as to sandwich the plate-shaped portion 103 with the locking portion 122. Composed. And there is no gap between the columnar part 121 and the pressure contact part 124, and both the parts 121 and 124 are in close contact.

Japanese Utility Model Publication No. 03-78771

  Here, when the plate-like portion 103 is injection-molded, burrs 107 and corner portions 108 are formed on the upper opening edge or the lower opening edge of the support hole 105 of the plate-like portion 103. The burr 107 and the corner 108 are formed even when the support hole 105 is formed by punching the plate-like part 103. However, in the conventional check valve 102, there is no gap between the columnar part 121 and the pressure contact part 124, and both 121 and 124 are in close contact with each other. When the processing is not complete, the plate-like portion 103 is sandwiched between the locking portion 122 and the pressure contact portion 124 with the burr 107 and the corner portion 108 interposed therebetween (see FIG. 5A). For this reason, when the burr 107 or the corner portion 108 strongly presses the locking portion 122 or the pressure contact portion 124, stress concentration may occur in the locking portion 122 or the pressure contact portion 124 and a crack may occur. As a result, the airtightness by the front end side of the umbrella-shaped part 123 cannot be maintained over a long period of time.

  The present invention has been made in view of the above situation, and an object of the present invention is to provide a check valve and a check valve structure that can maintain airtightness at the tip side of the umbrella-shaped portion of the check valve over a long period of time.

In order to solve the above-mentioned problem, the invention according to claim 1 is a check valve which is attached to a plate-like portion and prevents a back flow of fluid in a passage hole formed through the plate-like portion. A columnar portion that can be inserted into a support hole formed through the plate-shaped portion, a locking portion that is provided on the upper end side of the columnar portion and has an outer diameter larger than the hole diameter of the support hole, and a lower end side of the columnar portion An umbrella-like portion extending obliquely upward in the centrifugal direction and having a tip side press-contacted to the lower surface of the plate-like portion so as to cover the passage hole, and a cylindrical shape rising from the upper surface side of the umbrella-like portion, A press-contact portion that can be pressed against the lower surface of the plate-like portion so as to sandwich the plate-like portion between the stop portion and an outer periphery of the column-like portion between the column-like portion and the press-contact portion. The gist is that an annular groove that is recessed downward is formed so as to surround.
The invention according to claim 2 is characterized in that, in the invention according to claim 1, the groove depth of the annular groove is set to a value equal to or smaller than the pressure contact width in the longitudinal section of the pressure contact portion.
A third aspect of the present invention is the invention according to the first or second aspect, wherein the annular groove is arranged so that an outer peripheral edge thereof is located outside an outer peripheral edge of the locking portion. And
In order to solve the above problem, the invention according to claim 4 is a check valve structure in which the check valve according to any one of claims 1 to 3 is attached to the plate-like portion, and the plate At least one of a burr and a corner is formed on the lower opening edge of the support hole in the shape portion, and when the burr is formed, the burr is formed in the annular groove of the check valve. When the corner is formed, the gist is that the corner faces the annular groove of the check valve.
In order to solve the above problem, the invention according to claim 5 is a check valve structure in which the check valve according to any one of claims 1 to 3 is attached to the plate-like portion, and the plate At least one of a burr and / or a corner is formed on the upper opening edge of the support hole of the shape portion, and the burr and / or the corner is sandwiched between the locking portion and the pressure contact portion. The gist is that the plate-like portion is sandwiched.

According to the check valve of the present invention, a columnar part that can be inserted into the support hole formed through the plate-shaped part, a locking part that is provided on the upper end side of the columnar part and has an outer diameter larger than the hole diameter of the support hole, An umbrella-shaped portion that extends obliquely upward in the centrifugal direction from the lower end side of the columnar portion, the tip side can be pressed against the lower surface of the plate-shaped portion so as to cover the passage hole, and is raised in a cylindrical shape from the upper surface side of the umbrella-shaped portion, A pressure contact portion that can be pressure contacted to the lower surface of the plate-like portion so as to sandwich the plate-like portion with the locking portion. An annular groove that is recessed downward is formed between the columnar portion and the pressure contact portion so as to surround the outer periphery of the columnar portion. Thereby, for example, when burrs and corners are formed at the lower opening edge of the support hole of the plate-like part, the burrs are accommodated in the annular groove, or the corners are opposed to the annular groove, Stress concentration at the locking part and the pressure contact part is suppressed, and the generation of cracks is prevented. Also, for example, when burrs or corners are formed at the upper opening edge of the support hole of the plate-like part, the plate-like part is sandwiched between the locking part and the pressure contact part with the burr or corner interposed therebetween. It becomes. Since the check valve is easily elastically deformed by the annular groove, stress concentration at the locking portion and the pressure contact portion is suppressed, and the occurrence of cracks is prevented. Therefore, the airtightness by the front end side of the umbrella-shaped portion of the check valve can be maintained over a long period of time.
Further, when the groove depth of the annular groove is set to a value equal to or smaller than the pressure contact width in the longitudinal section of the pressure contact portion, the strength of the pressure contact portion is increased, so that the pressure contact portion is prevented from falling down.
Furthermore, when the annular groove is arranged so that the outer peripheral edge is located outside the outer peripheral edge of the locking portion, the check valve is more easily elastically deformed by the annular groove, so that stress concentration is further increased. It can be reliably suppressed. Furthermore, the moldability of the check valve (particularly, the die-cutting moldability) is improved.

  According to the check valve structure of the present invention, at least one of a burr and a corner is formed on the lower opening edge of the support hole of the plate-like part, and when a burr is formed, When burrs are accommodated in the annular groove and corners are formed, the corners face the annular groove of the check valve. Thereby, the stress concentration at the locking portion and the pressure contact portion is suppressed, and the occurrence of cracks is prevented. Therefore, the airtightness by the front end side of the umbrella-shaped portion of the check valve can be maintained over a long period of time. Furthermore, the removal process of burrs and corners can be eliminated or a simple removal process can be performed, and the assemblability of the check valve structure is improved.

  According to another check valve structure of the present invention, at least one of a burr and a corner is formed on the upper opening edge of the support hole of the plate-like portion, and is locked with the burr and / or the corner interposed therebetween. A plate-like portion is sandwiched between the portion and the pressure contact portion. Thereby, since the check valve is easily elastically deformed by the annular groove, stress concentration at the locking portion and the pressure contact portion is suppressed, and the occurrence of cracks is prevented. Therefore, the airtightness by the front end side of the umbrella-shaped portion of the check valve can be maintained over a long period of time. Furthermore, the removal process of burrs and corners can be eliminated or a simple removal process can be performed, and the assemblability of the check valve structure is improved.

The present invention will be further described in the following detailed description with reference to the drawings referred to, with reference to non-limiting examples of exemplary embodiments according to the present invention. Similar parts are shown throughout the several figures.
It is a longitudinal cross-sectional view of the check valve structure provided with the check valve which concerns on Example 1. FIG. It is a disassembled perspective view of the said check valve structure. It is a longitudinal cross-sectional view of an engine provided with the said check valve structure. It is a longitudinal cross-sectional view of the check valve structure provided with the check valve which concerns on Example 2. FIG. It is explanatory drawing for demonstrating the conventional check valve, (a) shows the longitudinal cross-sectional view of a check valve, (a) shows the perspective view of a check valve.

  The items shown here are exemplary and illustrative of the embodiments of the present invention, and are the most effective and easy-to-understand explanations of the principles and conceptual features of the present invention. It is stated for the purpose of providing what seems to be. In this respect, it is not intended to illustrate the structural details of the present invention beyond what is necessary for a fundamental understanding of the present invention. It will be clear to those skilled in the art how it is actually implemented.

<Check valve>
The check valve according to the present embodiment is a check valve (2, 32) that is attached to the plate-like portion (3, 33) and prevents a back flow of fluid in a passage hole (6) formed through the plate-like portion. (See, for example, FIGS. 1 and 4). And the columnar part (21) which can be inserted into the support hole (5) formed through the plate-shaped part (3, 33) and the upper end side of the columnar part, and has an outer diameter larger than the hole diameter of the support hole. A locking portion (22, 22 ') having an umbrella-shaped portion extending obliquely upward in the centrifugal direction from the lower end side of the columnar portion and having a distal end side capable of being pressed against the lower surface of the plate-shaped portion so as to cover the passage hole (6) 23) and a pressure contact portion (24, 24 ') that is raised in a cylindrical shape from the upper surface side of the umbrella-shaped portion and can be pressure-contacted to the lower surface of the plate-shaped portion so as to sandwich the plate-shaped portion with the locking portion. And comprising. Further, an annular groove (27) is formed between the columnar part (21) and the press contact part (24, 24 ') so as to be recessed downward so as to surround the outer periphery of the columnar part.

  In the check valve according to the present embodiment, for example, the groove depth (F) of the annular groove (27) is set to a value equal to or smaller than the pressure contact width (2W) in the longitudinal section of the pressure contact portion (24, 24 ′). (See, for example, FIG. 1 and FIG. 4). In this case, for example, the groove depth (F) of the annular groove (27) can be set to a value equal to or greater than ½ of the pressure contact width (2W). As a result, the check valve is more easily elastically deformed, and stress concentration can be more reliably suppressed.

  As the check valve according to the present embodiment, for example, the annular groove (27) has its outer peripheral edge (27a) positioned outside the outer peripheral edge (22a, 22'a) of the locking portion (22, 22 '). The form (refer FIG.1 and FIG.4 etc., for example) arrange | positioned so that can be mentioned.

<Check valve structure>
The check valve structure according to this embodiment is a check valve structure (1) in which the check valve (2) according to the above embodiment is attached to a plate-like portion (3), and the support hole (5) of the plate-like portion. At least one of the burr (7) and the corner (8) is formed on the lower opening edge of the check valve. When the burr is formed, the burr is formed in the annular groove (27) of the check valve. When it is accommodated and a corner is formed, the corner faces the annular groove (27) of the check valve (see, for example, FIG. 1).

<Other check valve structures>
Another check valve structure according to this embodiment is a check valve structure (31) in which the check valve (32) according to the above embodiment is attached to a plate-like portion (33), and includes a support hole ( 5) At least one of the burrs (7) and the corners (8) is formed on the upper opening edge of the 5), and the locking portions (22 ') and the pressure contact portions ( 24 ') is sandwiched between the plate-like portions (33) (see, for example, FIG. 4).

  In addition, the code | symbol in the parenthesis of each structure described in the said embodiment shows the correspondence with the specific structure as described in the Example mentioned later.

  Hereinafter, the present invention will be specifically described with reference to the drawings. In this embodiment, a check valve structure provided in the cylinder head cover of the engine is exemplified (see FIG. 3).

(1) Configuration of Check Valve Structure A check valve structure 1 according to this embodiment is a structure in which a rubber check valve 2 is attached to a resin plate-like portion 3 as shown in FIGS. . In the plate-like portion 3, one support hole 5 and a plurality of (four in FIG. 2) passage holes 6 arranged on the outer peripheral side of the support hole 5 are formed through. Further, the plate-like portion 3 is injection-molded, and is set so that burrs 7 and corner portions 8 are formed at the lower opening edge of the support hole 5. The burr 7 protrudes downward, and the corner 8 is substantially perpendicular. An arcuate portion 9 is formed at the upper opening edge of the support hole 5 of the plate-like portion 3. Further, as shown in FIG. 3, the plate-like portion 3 is constituted by a part of a baffle plate 14 for forming a gas-liquid separation space 13 in the cylinder head cover 12 of the engine 11. A separator 15 for collecting oil in blow-by gas introduced into the space 13 is disposed in the gas-liquid separation space 13.

  As shown in FIGS. 1 and 2, the check valve 2 includes a columnar portion 21, a locking portion 22, an umbrella-shaped portion 23, and a pressure contact portion 24. The columnar portion 21 is formed in a columnar shape that can be inserted into the support hole 5 (specifically, can be fitted and inserted). Further, the columnar portion 21 has an outer diameter substantially the same as the hole diameter of the support hole 5. The locking portion 22 is formed to bulge in the centrifugal direction on the upper end side of the columnar portion 21 and has an outer diameter larger than the hole diameter of the support hole 5. Further, the lower surface side of the locking portion 22 has a curved surface shape that follows the arcuate portion 9 of the support hole 5. At the center of the upper end of the locking portion 22, there is provided a knob 25 for picking up and pulling up when the check valve 2 is inserted into the support hole 5.

  The umbrella-shaped part 23 extends obliquely upward in the centrifugal direction from the lower end side of the columnar part 21. The umbrella-like portion 23 is in pressure contact with the lower surface of the plate-like portion 3 so as to cover the plurality of passage holes 6 when the columnar portion 21 is inserted into the support hole 5. And the umbrella-shaped part (namely, valve body) 23 prevents that a fluid (for example, blow-by gas, oil, etc.) flows backward through the passage hole 6 from the lower part to the upper part. Further, the press contact part 24 is raised in a cylindrical shape from the upper surface side of the umbrella-like part 23. When the columnar portion 21 is inserted into the support hole 5, the pressure contact portion 24 is in pressure contact with the lower surface of the plate-like portion 3 so as to sandwich the plate-like portion 3 with the locking portion 22.

  Here, an annular groove 27 is formed between the columnar portion 21 and the pressure contact portion 24 so as to be recessed downward so as to surround the outer periphery of the columnar portion 21. As shown in FIG. 1, the groove depth F of the annular groove 27 is set to a value equal to or less than the pressure contact width 2W in the longitudinal section of the pressure contact portion 24, and is equal to or greater than ½ (that is, W) of the pressure contact width 2W. Value. Further, the annular groove 27 is arranged such that the outer peripheral edge 27 a is located on the centrifugal outer side with respect to the outer peripheral edge 22 a of the locking portion 22. Further, the annular groove 27 is arranged so that the inner peripheral edge 27b thereof substantially coincides with the outer peripheral edge of the columnar portion 21 (that is, the inner peripheral edge of the support hole 5).

(2) Method for assembling check valve structure Next, a method for assembling the check valve structure 1 having the above configuration will be described. In the present embodiment, it is assumed that the burr 7 and the corner 8 are not removed or cannot be completely removed even after the removal process. The knob 25 of the check valve 2 is inserted from below the support hole 5, the knob 25 is picked, the check valve 2 is pulled up, and the columnar portion 21 is inserted into the support hole 5. Then, the plate-like portion 3 is sandwiched between the locking portion 22 and the press-contact portion 24, and the tip side of the umbrella-like portion 23 is in pressure contact with the lower surface of the plate-like portion 3. At this time, the burr 7 is accommodated in the annular groove 27 and the corner portion 8 faces the annular groove 27.

  According to the check valve structure 1 configured as described above, the inside of the gas-liquid separation space 13 is under negative pressure during operation of the engine 11, so that the tip side of the umbrella-like portion 23 is in pressure contact with the lower surface of the plate-like portion 3. Thus, the flow of blow-by gas in the cylinder head through the passage hole 6 is restricted (indicated by a solid line in FIG. 1). On the other hand, when the engine 11 is stopped, due to the weight of the oil accumulated on the upper surface side of the umbrella-like portion 23, the oil falls through the passage hole 6 when the tip side of the umbrella-like portion 23 is separated from the lower surface of the plate-like portion 3. (Indicated in phantom lines in FIG. 1)

(3) Effect of Example According to the check valve 2 of this example, the columnar part 21 that can be inserted into the support hole 5 that is formed through the plate-like part 3 and the upper end side of the columnar part 21 are provided. 5 and an umbrella that extends obliquely upward in the centrifugal direction from the lower end side of the columnar portion 21 and whose tip side can be pressed against the lower surface of the plate-like portion 3 so as to cover the passage hole 6. The pressure contact portion 24 that rises in a cylindrical shape from the upper surface side of the shape-like portion 23 and the umbrella-like portion 23 and can be pressed against the lower surface of the plate-like portion 3 so as to sandwich the plate-like portion 3 with the locking portion 22. And comprising. And between the columnar part 21 and the press-contact part 24, the annular groove 27 dented below is formed so that the outer periphery of the columnar part 21 may be enclosed. As a result, the burr 7 is accommodated in the annular groove 27 and the corner portions 8 face each other, so that stress concentration at the locking portion 22 and the pressure contact portion 24 is suppressed, and the occurrence of cracks is prevented. Therefore, the airtightness by the front end side of the umbrella-shaped part 23 of the check valve 2 can be maintained over a long period of time.

  When the check valve 2 is attached to the plate-like portion 3, the burr 7 is removed from the lower opening edge of the support hole 5, and the plate is interposed between the locking portion 22 and the pressure contact portion 24 across the burr 7. The shaped part 3 may be pinched. Even in this case, since the check valve 2 is easily elastically deformed by the annular groove 27, stress concentration at the locking portion 22 and the pressure contact portion 24 is suppressed.

  Further, in this embodiment, the groove depth F of the annular groove 27 is set to a value equal to or less than the pressure contact width 2W in the longitudinal section of the pressure contact portion 24. Thereby, since the intensity | strength of the press-contact part 24 is raised, the fall of the press-contact part 24 is prevented. Furthermore, in this embodiment, the groove depth F of the annular groove 27 is set to a value equal to or greater than ½ of the pressure contact width 2W. Thereby, the check valve 2 is further easily elastically deformed, and the stress concentration can be more reliably suppressed.

  Further, in the present embodiment, the annular groove 27 is disposed so that the outer peripheral edge 27 a is located outside the outer peripheral edge of the locking portion 22. Thereby, since the check valve 32 is further easily elastically deformed by the annular groove 27, the stress concentration can be more reliably suppressed. Furthermore, the moldability (particularly the die-cut moldability) of the check valve 2 is improved.

  Furthermore, according to the check valve structure 1 of the present embodiment, burrs 7 and corners 8 are formed at the lower opening edge of the support hole 5 of the plate-like portion 3, and the burrs 7 are formed in the annular groove 27 of the check valve 2. 7 is accommodated and the corner 8 is opposed. Thereby, the stress concentration in the locking part 22 and the pressure contact part 24 is suppressed, and the occurrence of cracks is prevented. Therefore, the airtightness by the front end side of the umbrella-shaped part 23 of the check valve 2 can be maintained over a long period of time. Furthermore, the removal process of the burrs 7 and the corners 8 can be eliminated or a simple removal process, and the assemblability of the check valve structure 1 can be improved.

<Example 2>
Next, a check valve structure according to the second embodiment will be described. In the check valve structure according to the second embodiment, the same components as those in the check valve structure 1 according to the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

(1) Configuration of Check Valve Structure A check valve structure 31 according to this embodiment is a structure in which a rubber check valve 32 is attached to a resin plate-like portion 33 as shown in FIG. The plate-like portion 33 is formed with a support hole 5 and a passage hole 6 therethrough. Further, the plate-like portion 33 is injection-molded, and is set so as to form burrs 7 and corner portions 8 at the upper opening edge of the support hole 5. An arcuate portion 9 is formed at the lower opening edge of the support hole 5 of the plate-like portion 33.

  The check valve 32 includes a columnar portion 21, a locking portion 22 ', an umbrella-shaped portion 23, and a pressure contact portion 24'. The locking portion 22 'has a flat bottom surface. The pressure contact portion 24 ′ is raised in a cylindrical shape from the upper surface side of the umbrella-shaped portion 23. Further, when the columnar portion 21 is inserted into the support hole 5, the press contact portion 24 ′ presses against the lower surface of the plate portion 33 so as to sandwich the plate portion 33 with the locking portion 22 ′. Further, the press contact portion 24 ′ is arranged so that the outer peripheral edge thereof is positioned in the vicinity of the opening edge of the passage hole 6 in the longitudinal section. Further, an annular groove 27 is formed between the columnar portion 21 and the press contact portion 24 ′.

(2) Method for assembling check valve structure Next, a method for assembling the check valve structure 31 having the above configuration will be described. In the present embodiment, it is assumed that the burr 7 and the corner 8 are not removed or cannot be completely removed even if removed. The knob 25 of the check valve 32 is inserted from below the support hole 5, the knob 25 is picked, the check valve 32 is pulled up, and the columnar portion 21 is inserted into the support hole 5. Then, the plate-like portion 33 is sandwiched between the locking portion 22 ′ and the press-contact portion 24 ′, and the tip side of the umbrella-like portion 23 is in pressure contact with the lower surface of the plate-like portion 33. At this time, the burr 7 and the corner 8 are sandwiched between the lower surface of the locking portion 22 ′ and the upper surface of the plate-shaped portion 33, and the plate-shaped portion 33 is interposed between the locking portion 22 ′ and the pressure contact portion 24 ′. Is pinched.

(3) Effects of Example According to the check valve 32 of this example, the columnar part 21 that can be inserted into the support hole 5 that is formed through the plate-shaped part 33 and the upper end side of the columnar part 21 are provided. The locking portion 22 ′ having an outer diameter larger than the hole diameter of 5, and extends obliquely upward in the centrifugal direction from the lower end side of the columnar portion 21, and the tip side can be pressed against the lower surface of the plate-like portion 33 so as to cover the passage hole 6. Pressure contact that is raised in a cylindrical shape from the upper surface side of the umbrella-shaped portion 23 and the umbrella-shaped portion 23 and can be pressed against the lower surface of the plate-shaped portion 33 so as to sandwich the plate-shaped portion 33 between the locking portions 22 ′. Part 24 '. And between the columnar part 21 and press-contact part 24 ', the annular groove 27 dented below is formed so that the outer periphery of the columnar part 21 may be enclosed. Accordingly, the plate-like portion 33 is sandwiched between the locking portion 22 ′ and the pressure contact portion 24 ′ with the burr 7 and the corner portion 8 interposed therebetween, but the check valve 32 is easily elastically deformed by the annular groove 27. The stress concentration at the locking portion 22 ′ and the pressure contact portion 24 ′ is suppressed, and the generation of cracks is prevented. Therefore, the airtightness by the front end side of the umbrella-shaped part 23 of the check valve 32 can be maintained over a long period of time.

  In this embodiment, the groove depth F of the annular groove 27 is set to a value equal to or smaller than the pressure contact width 2W in the longitudinal section of the pressure contact portion 24 '. Thereby, since the strength of the press contact portion 24 ′ is increased, the press contact portion 24 ′ is prevented from falling. Furthermore, in this embodiment, the groove depth F of the annular groove 27 is set to a value equal to or greater than ½ of the pressure contact width 2W. Thereby, the check valve 32 is further easily elastically deformed, and the stress concentration can be more reliably suppressed.

  Further, in the present embodiment, the annular groove 27 is arranged so that the outer peripheral edge 27a is positioned outside the outer peripheral edge 22'a of the locking portion 22 '. Thereby, the check valve 32 is further easily elastically deformed by the annular groove 27, and the stress concentration can be more reliably suppressed. Furthermore, the moldability (particularly the die-cutting moldability) of the check valve 32 is improved.

  Further, according to the check valve structure 31 of the present embodiment, the burr 7 and the corner 8 are formed on the opening edge of the plate-shaped portion 33 on the upper side of the support hole 5, and the burr 7 and the corner 8 are sandwiched therebetween. A plate-like portion 33 is sandwiched between the locking portion 22 ′ and the pressure contact portion 24 ′. As a result, the check valve 32 is easily elastically deformed by the annular groove 27, so that stress concentration at the locking portion 22 'and the pressure contact portion 24' is suppressed, and the occurrence of cracks is prevented. Therefore, the airtightness by the front end side of the umbrella-shaped part 23 of the check valve 32 can be maintained over a long period of time. Further, the removal process of the burr 7 and the corner 8 can be eliminated or a simple removal process can be performed, and the assemblability of the check valve structure 31 is improved.

  In the present invention, the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention depending on the purpose and application. That is, in the first and second embodiments, the mode in which the check valves 2 and 32 are inserted into the plate-like portions 3 and 33 where the burrs 7 and the corner portions 8 are formed at the opening edge of the support hole 5 is illustrated. For example, the check valves 2 and 32 are inserted into a plate-like portion in which the burr 7 and the corner 8 are not formed on the opening edge of the support hole 5 or the burr 7 and the corner 8 are completely removed. Also good. In addition, for example, the check valves 2 and 32 may be inserted into plate-like portions where burrs 7 and corner portions 8 are formed on the upper and lower opening edges of the support hole 5. Further, for example, the check valves 2 and 32 may be inserted into a plate-like portion where only one of the burr 7 and the corner portion 8 is formed.

  Moreover, in the said Example 1, 2, although the annular groove 27 illustrated the form arrange | positioned so that the inner periphery 27b may substantially correspond to the inner periphery of the support hole 5, it is not limited to this, For example, annular The groove may be arranged such that the inner peripheral edge thereof is located on the centripetal side from the inner peripheral edge of the support hole. In this case, for example, the columnar portion 21 is rolled in the centripetal direction by the annular groove 27 on the lower side of the portion inserted into the support hole 5.

  Moreover, in the said Example 1, 2, although resin-made plate-shaped parts 3 and 33 were illustrated, it is not limited to this, For example, it is good also as a metal-made plate-shaped part. Furthermore, in Examples 1 and 2, the rubber check valves 2 and 32 are exemplified, but the present invention is not limited to this. For example, as long as the check valves 2 and 32 are flexible, they can be made of elastomer or resin. It is good also as a manufactured check valve.

  Furthermore, in the said Example 1, 2, although the check valves 2 and 32 used with the cylinder head cover 12 were illustrated, it is not limited to this, For example, it is good also as a check valve used with an air cleaner.

  The foregoing examples are for illustrative purposes only and are not to be construed as limiting the invention. Although the invention has been described with reference to exemplary embodiments, it is to be understood that the language used in the description and illustration of the invention is illustrative and exemplary rather than limiting. As detailed herein, changes may be made in its form within the scope of the appended claims without departing from the scope or spirit of the invention. Although specific structures, materials and examples have been referred to in the detailed description of the invention herein, it is not intended to limit the invention to the disclosure herein, but rather, the invention is claimed. It covers all functionally equivalent structures, methods and uses within the scope.

  The present invention is not limited to the embodiments described in detail above, and various modifications or changes can be made within the scope of the claims of the present invention.

  The present invention is widely used as a technique for preventing backflow of fluid. In particular, it is suitably used as a technique relating to check valves used in vehicles such as passenger cars, buses, trucks, and the like.

  DESCRIPTION OF SYMBOLS 1,31; Check valve structure, 2,32; Check valve, 3,33; Plate-shaped part, 5: Support hole, 6: Passage hole, 7: Burr, 8; Corner part, 21: Columnar part, 22,22 '; Locking part, 23; umbrella-shaped part, 24, 24'; pressure contact part, 27; annular groove, F: depth of annular groove, 2W; pressure contact width of pressure contact part.

Claims (5)

A check valve that is attached to a plate-like portion and prevents back flow of fluid in a passage hole formed through the plate-like portion,
A columnar portion that can be inserted through a support hole formed through the plate-shaped portion;
A locking portion provided on the upper end side of the columnar portion and having an outer diameter larger than the diameter of the support hole;
An umbrella-shaped portion that extends obliquely upward in the centrifugal direction from the lower end side of the columnar portion, and whose tip side can be pressed against the lower surface of the plate-shaped portion so as to cover the passage hole;
A pressure contact portion that rises in a cylindrical shape from the upper surface side of the umbrella-shaped portion and can be pressed against the lower surface of the plate-shaped portion so as to sandwich the plate-shaped portion with the locking portion;
An annular groove recessed downward is formed between the columnar part and the pressure contact part so as to surround the outer periphery of the columnar part.   The check valve according to claim 1, wherein the groove depth of the annular groove is set to a value equal to or smaller than a pressure contact width in a longitudinal section of the pressure contact portion.   3. The check valve according to claim 1, wherein the annular groove is disposed such that an outer peripheral edge thereof is located outside an outer peripheral edge of the locking portion. A check valve structure in which the check valve according to any one of claims 1 to 3 is attached to the plate-like portion,
At least one of a burr and a corner is formed on the lower opening edge of the support hole of the plate-like part, and when the burr is formed, the burr is formed in the annular groove of the check valve. When the burr is accommodated and the corner portion is formed, the corner portion is opposed to the annular groove of the check valve. A check valve structure in which the check valve according to any one of claims 1 to 3 is attached to the plate-like portion,
At least one of a burr and / or a corner is formed on the upper opening edge of the support hole of the plate-like portion, and the locking portion and the pressure contact portion sandwich the burr and / or the corner. A check valve structure characterized in that the plate-like portion is sandwiched between the two.

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