JP2015140883A - Check valve and air intake duct of internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a check valve capable of suppressing staying of a foreign substance, and an air intake duct of an internal combustion engine including the same.SOLUTION: A check valve 30 includes: a body member 40 in which a liquid passage 41 is provided; and a float member 50 which is disposed in the body member 40 and which can float by buoyancy F. The check valve 30 blocks the liquid passage 41 by the float member 50 floating when a liquid surface rises from a downstream side of the liquid passage 41. At the body member 40, a slit 42 is provided for communicating an outside surface of the body member 40 and the liquid passage 41. The float member 50 has: a float body 51; an arm 52 protruding from a side surface of the float body 51 and arranged inside the slit 42 in a slidable manner; and an upper surface 51a for blocking the liquid passage 41 when the liquid surface rises from the downstream side of the liquid passage 41. An upper surface 52a of the arm 52 is formed in a curved surface shape which protrudes upward or in a taper shape. The upper surface 51a is formed in a curved surface shape which protrudes upward.

Description

  The present invention relates to a check valve and an intake duct of an internal combustion engine including the check valve.

  For example, Patent Document 1 discloses a check valve attached to the inside of a fuel tank. This check valve has a guide member having a plurality of slits and a plurality of fuel passages, and a square columnar arm that is slidably connected to the slits. The float member which interrupts | blocks.

Japanese Utility Model Publication No. 06-75852

However, in the check valve described in Patent Document 1, since the arm has a planar shape, foreign matters such as dust are likely to stay in the arm. For this reason, the retained foreign matter may hinder the operation of the float member, which may deteriorate the sealing performance.
If the check valve described in Patent Document 1 is attached to the drainage hole of the intake duct, for example, when the vehicle enters a puddle, the drainage hole is not properly blocked, There is a risk that liquid (for example, water) may enter the inside of the duct.

  The present invention has been developed from such a viewpoint, and an object thereof is to provide a check valve capable of suppressing the retention of foreign matter and an intake duct of an internal combustion engine including the check valve.

  In order to solve the above-mentioned problems, the present invention comprises a main body member provided with a liquid passage, and a float member arranged in the main body member and capable of floating by buoyancy, and the liquid level from the downstream side of the liquid passage Is a check valve that floats when the float member rises to shut off the liquid passage, and the main body member is provided with a slit that communicates the outer surface of the main body member and the liquid passage, The float member projects from a float body, an arm protruding from a side surface of the float body and slidably disposed in the slit, and blocks the liquid passage when the liquid level rises from the downstream side of the liquid passage. A seal portion, and the upper surface of the arm is formed in a curved shape or a tapered shape that protrudes upward, and the seal portion is formed in a curved shape that protrudes upward. To.

  According to the present invention, the upper surface of the arm is formed in a curved surface shape or a taper shape that protrudes upward, and the seal portion is formed in a curved surface shape that protrudes upward. It flows smoothly along the upper surface and is less likely to stay on the upper surface of the seal part or arm. Therefore, the foreign substance does not hinder the operation of the float member, and a sufficient sealing performance can be ensured.

  Further, the main body member is provided with a stopper portion that contacts the lower surface of the arm to prevent the float member from falling off, and the upper surface of the stopper portion is lowered as it moves away from the center of the main body member in the radially outward direction. It is preferable to have a configuration that is inclined so as to be located at the center.

  According to such a configuration, since the upper surface of the stopper portion is inclined so as to be positioned downward as it moves away from the center of the main body member, the foreign matter flows down along the upper surface of the stopper portion, and the stopper portion It is difficult to stay on the upper surface.

  Further, the present invention is an intake duct of an internal combustion engine provided with the check valve, and includes an intake duct main body, and a drain hole provided in the intake duct main body, It is attached to the drainage hole.

  According to the present invention, the upper surface of the arm is formed in a curved surface shape or a tapered shape that protrudes upward, and the seal portion is formed in a curved surface shape that protrudes upward. When discharged from the inside of the duct, the foreign matter flows smoothly along the upper surfaces of the seal portion and the arm, and is less likely to stay on the upper surface of the seal portion and the arm. Therefore, the foreign substance does not hinder the operation of the float member, and a sufficient sealing performance can be ensured. Therefore, for example, when the vehicle enters a water pool, the drainage hole is appropriately blocked, so that it is possible to prevent liquid from entering the inside of the intake duct from the drainage hole.

  In the present invention, it is possible to provide a check valve capable of suppressing stagnation of foreign matter and an intake duct of an internal combustion engine including the check valve.

It is a schematic block diagram of the motor vehicle provided with the check valve and intake duct which concerns on this embodiment, (a) is a top view, (b) is Ib-Ib arrow sectional drawing shown to (a). It is sectional drawing of the non-return valve in the II-II arrow view of Fig.1 (a). It is a perspective view of a check valve. It is a block diagram of a main body member, (a) is a side view, (b) is a vertical sectional view in the direction of arrows IVb-IVb in (a), (c) is a horizontal sectional view in the direction of arrows IVc-IVc in (a). . It is a block diagram of a float member, (a) is a left view, (b) is a front view, (c) is a bottom view. It is sectional drawing for demonstrating operation | movement of a non-return valve when the water surface rises horizontally. It is a left view of the float member which concerns on a modification.

  Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. Note that “front and rear” and “up and down” indicated by appropriate arrows in each figure indicate the front and rear direction and vertical direction of the vehicle, and “left and right” indicate the left and right direction (vehicle width direction) viewed from the driver's seat, respectively. Show.

  As shown in FIGS. 1A and 1B, an automobile 10 that is a vehicle has an engine mounting chamber 12 provided in a vehicle body front portion 11, an engine 13, an air cleaner 14, a radiator 15, a battery 16, an intake duct 20, and the like. Equipment. Further, the equipment mounting chamber 12 has a pair of left and right side frames 17 and 17 extending in the front-rear direction, and a bulkhead 18 installed at the front end of the side frames 17 and 17. In FIG. 1A, the battery 16 is omitted for convenience of explanation.

  The intake duct 20 is a duct that sucks in air supplied to the engine 13 that is an internal combustion engine, and is connected to the engine 13 via an air cleaner 14. The intake duct 20 includes an intake port 21, a rising portion 22 that falls from the intake port 21, a rising portion 23 that rises from a lower end portion 25 of the falling portion 22, and a connecting portion 24 that connects the upper end of the rising portion 23 and the air cleaner 14. And a drain hole 26 provided in the lower end portion 25 of the upright portion 22. The air inlet 21 is disposed in the upper front portion of the equipment mounting chamber 12, specifically, between the upper end of the radiator 15 and the bulkhead 18. The upright portion 22 falls from immediately after the intake port 21 to the vicinity of the bottom of the equipment mounting chamber 12. A lower end portion 25 of the standing portion 22 extends to the left side of the left side frame 17 below the battery 16. The upright portion 23 rises from the lower end portion 25 and is connected to the air cleaner 14 above the left side frame 17. As shown in FIG. 1B, a drain hole 26 is provided at the lower end 25 of the standing part 22, and a check valve 30 is attached to the drain hole 26. In this embodiment, the upright part 22, the upright part 23, and the connection part 24 comprise the intake duct main body of a claim. The drain hole 26 constitutes a drain hole in the scope of claims.

  As shown in FIGS. 2 to 5, the check valve 30 discharges water (liquid) from the inside of the intake duct 20 and suppresses water from entering the inside of the intake duct 20 from the drain hole 26. It is. That is, the check valve 30 allows or blocks communication between the inside and the outside of the intake duct 20. The check valve 30 is a normally open type float valve, and includes a main body member 40 attached to the drain hole 26 and provided with a liquid passage 41, and a float member 50 that is disposed in the main body member 40 and can float by buoyancy. I have. In the check valve 30, when the water surface rises from the downstream side of the liquid passage 41, the float member 50 floats to block the liquid passage 41 (see FIG. 6).

  As shown in FIGS. 2 to 4, the main body member 40 is a member formed in a cylindrical shape as a whole, and is made of, for example, a relatively soft resin material. The main body member 40 has a function of guiding the floating member 50 that is floating. The main body member 40 is formed on the upper end side of the main body member 40, a liquid passage 41 penetratingly formed from the upper end to the lower end, a pair of slits 42, 42 communicating the outer surface of the main body member 40 and the liquid passage 41. And an annular groove 43.

  The liquid passage 41 is a passage through which water (liquid) discharged from the drain hole 26 passes. The liquid passage 41 has a small diameter portion 41a on the upper end side, a large diameter portion 41b on the lower end side, and a valve seat 41c formed between the small diameter portion 41a and the large diameter portion 41b. The large diameter portion 41b is formed to have a larger diameter than a main body portion 51 of the float member 50 described later. The large diameter portion 41 b also serves as a housing portion for the float member 50. The small diameter portion 41a is formed to have a smaller diameter than the main body portion 51 of the float member 50 described later. The valve seat 41c is a part where the float member 50 is seated when the float member 50 is lifted. The valve seat 41c is formed in a tapered shape that decreases in diameter toward the small diameter portion 41a from the large diameter portion 41b.

  The slits 42 are horizontal holes formed vertically along the axial direction (vertical direction) of the liquid passage 41, and two slits 42 are provided on the side wall of the main body member 40 at intervals of 180 degrees. The slit 42 communicates with the large diameter portion 41 b of the liquid passage 41. The slit 42 is formed in a fan shape that is relatively wide in a horizontal sectional view (see FIG. 4C). In the slit 42, arms 52 and 52 of the float member 50 described later are respectively inserted. The slit 42 has a function of discharging the liquid in addition to the function of guiding the arm 52. Below the slit 42, a stopper portion 44 that contacts the lower surface 52 b of the arm 52 and prevents the float member 50 from falling off is formed. The upper surface 44a of the stopper portion 44 is formed in a tapered shape that is inclined so as to be positioned downward as it moves away from the center of the main body member 40 in the radially outward direction.

  The annular groove 43 is a groove for attaching the check valve 30 to the drain hole 26 of the intake duct 20. As shown in FIG. 2, an annular protrusion 26 a that protrudes inward is formed at the lower end of the drain hole 26, and the annular protrusion 26 a is fitted in the annular groove 43. As a result, the main body member 40 is locked in the drain hole 26.

  As shown in FIGS. 2, 3, and 5, the float member 50 is a valve body that opens or blocks the liquid passage 41. The float member 50 is formed in a hollow structure by, for example, blow molding (hollow molding) in which a resin material is expanded and molded inside a mold. The float member 50 is made of, for example, a resin material having a specific gravity lighter than water. The float member 50 includes a substantially cylindrical main body 51, a pair of arms 52 and 52 protruding from the outer surface 51 b of the main body 51, a hollow portion 53 provided inside the main body 51, A communication hole 54 that communicates the lower surface 51 c and the hollow portion 53 is provided. The float member 50 is slidably and tiltably disposed inside the main body member 40.

  The main body 51 is disposed in the liquid passage 41. The surface of the main body 51 is composed of three surfaces, an upper surface 51a, an outer surface 51b, and a lower surface 51c, and has a rounded shape as a whole. The upper surface 51a is formed in a hemispherical shape (dome shape) that protrudes upward, and has a function of blocking the liquid passage 41 by sitting on the valve seat 41c. The outer side surface 51b is formed in a circumferential shape. The lower surface 51c is formed in a planar shape extending horizontally. A corner 51d where the outer side surface 51b and the lower surface 51c intersect is formed in an arc shape that is convex outward and downward. A hollow portion 53 is provided inside the main body 51 to enhance the buoyancy of the float member 50. The communication hole 54 is a hole for blowing air when the float member 50 is blow-molded. The hollow portion 53 and the communication hole 54 are each formed in a circular shape in cross section and are concentric with each other. The upper surface 51a constitutes a seal portion in the claims.

  The arms 52 are portions that protrude horizontally from the outer surface 51 b of the main body 51, and two arms 52 are provided on the outer surface 51 b of the main body 51 at intervals of 180 degrees. The arm 52 is slidably disposed in the slit 42. The surface of the arm 52 includes three surfaces, that is, an upper surface 52a, a lower surface 52b, and a tip surface 52c, and has an overall rounded shape. Incidentally, the upper surface 52a refers to a surface excluding the front end surface 52c among the surfaces seen when the arm 52 is viewed from directly above, and the lower surface 52b is a surface that is visible when the arm 52 is viewed from directly below. Of these, the surface excluding the tip surface 52c is indicated. The arm 52 has a circular shape in a side view. The upper surface 52a is formed in an arc shape that is convex upward. The lower surface 52b is formed in an arc shape that protrudes downward. The tip surface 52c is formed in a hemispherical shape that protrudes outward.

  The automobile 10 including the check valve 30 and the intake duct 20 according to the embodiment of the present invention is basically configured as described above. Next, the function and effect will be described.

As shown in FIG. 2, in a normal state, the float member 50 is at a position (original position) spaced downward from the valve seat 41 c by its own weight. Then, the liquid passage 41 is opened, and communication between the inside and the outside of the intake duct 20 is allowed.
At this time, the arm 52 comes into contact with the upper surface 44a of the stopper portion 44, thereby preventing the float member 50 from falling off. The lower end side of the main body 51 is accommodated in the large diameter portion 41b.

Thus, since the check valve 30 is a normally open float valve, the water that has entered the inside of the intake duct 20 through the intake port 21 is always discharged to the outside through the drain hole 26, the liquid passage 41 and the slit 42. Is done.
At this time, the upper surface 52a of the arm 52 is formed in an arc shape that protrudes upward, and the upper surface 51a of the main body 51 is formed in a hemispherical shape that protrudes upward. When discharged from the inside of the duct 20, the foreign matter flows smoothly along the upper surface 51 a of the main body 51 and the upper surface 52 a of the arm 52, and hardly stays on the upper surface 51 a of the main body 51 or the upper surface 52 a of the arm 52.
Further, since the upper surface 44a of the stopper portion 44 is inclined so as to be positioned downward as it moves away from the center of the main body member 40, foreign matter flows down along the upper surface 44a of the stopper portion 44, and the stopper portion It also becomes difficult to stay on the upper surface 44a of 44.

  On the other hand, as shown in FIG. 6, when the water surface rises from the downstream side of the liquid passage 41, the float member 50 is in a position where it floats by the buoyancy F and is seated on the valve seat 41 c. Then, the liquid passage 41 is blocked and communication between the inside and outside of the intake duct 20 is blocked. Therefore, water can be prevented from entering the inside of the intake duct 20 from the drain hole 26.

According to the present embodiment described above, foreign matters are less likely to stay on the upper surface 51a of the main body 51, the upper surface 52a of the arm 52, and the upper surface 44a of the stopper portion 44, so that the operation of the float member 50 is hindered by the foreign matters. There is no, and sufficient sealing performance can be secured.
Therefore, for example, when the automobile 10 enters the water pool, the drain hole 26 is appropriately blocked, so that water can be prevented from entering the intake duct 20 from the drain hole 26.

  As mentioned above, although embodiment of this invention was described in detail with reference to drawings, this invention is not limited to this, In the range which does not deviate from the main point of invention, it can change suitably.

  In the present embodiment, substantially the entire surfaces of the main body 51 and the arm 52 are curved, but at least the upper surface 51a of the main body 51 and the upper surface 52a of the arm 52 may be curved.

In the present embodiment, the arm 52 has a circular shape in a side view, but may have an upward triangular shape in a side view shown in FIG. The upper surface 52a shown in FIG. 7 is formed in a tapered shape that protrudes upward. That is, the upper surface 52a is composed of two symmetrical left and right surfaces where the upper end portions are coupled to each other, and is formed in a tapered shape that becomes farther away from each other as it goes downward. The lower surface 52b is formed in a planar shape extending horizontally.
Even in this case, the foreign matter flows smoothly along the upper surface 52 a of the arm 52, and does not easily stay on the upper surface 52 a of the arm 52. Therefore, the foreign substance does not hinder the operation of the float member 50, and a sufficient sealing performance can be ensured.

  In this embodiment, the two arms 52 are provided on the outer surface 51b of the float member 50 at intervals of 180 degrees. However, the number of the arms 52 is not limited to this, and for example, four arms are provided at intervals of 90 degrees. 52 may be provided, or one arm 52 may be provided. In this case, the number of the slits 42 of the main body member 40 is a number corresponding to the arms 52.

  Moreover, in this embodiment, although the float member 50 was shape | molded by blow molding, this invention is not limited to this, You may shape the float member 50 with another shaping | molding method.

10 automobiles 13 engines (internal combustion engines)
20 Intake duct 22 Vertical section (intake duct body)
23 Upright (intake duct body)
24 Connection (intake duct body)
26 Drainage hole (drainage hole)
30 Check Valve 40 Main Body Member 41 Liquid Passage 42 Slit 44 Stopper 44a Upper Surface 50 Float Member 51 Main Body (Float Main Body)
51a Top surface (sealing part)
52 Arm 52a Upper surface

Claims (3)

A main body member provided with a liquid passage, and a float member disposed in the main body member and capable of floating by buoyancy, and the float member floats when the liquid level rises from the downstream side of the liquid passage. A check valve for blocking the liquid passage,
The main body member is provided with a slit communicating the outer surface of the main body member and the liquid passage,
The float member projects from a float body, an arm protruding from a side surface of the float body and slidably disposed in the slit, and blocks the liquid passage when the liquid level rises from the downstream side of the liquid passage. A seal portion,
The upper surface of the arm is formed in a curved shape or a tapered shape that is convex upward,
The check valve is formed in a curved shape that is convex upward. The main body member is provided with a stopper portion that contacts the lower surface of the arm and prevents the float member from falling off,
2. The check valve according to claim 1, wherein an upper surface of the stopper portion is inclined so as to be positioned downward as it moves away from the center of the main body member in a radially outward direction. An intake duct for an internal combustion engine comprising the check valve according to claim 1 or 2,
An intake duct body;
A drainage hole provided in the intake duct body,
An intake duct for an internal combustion engine, wherein the check valve is attached to the drain hole.

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