JP3529522B2 - Relief check valve - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a relief check valve, and more particularly to a relief check valve suitable for use in an oil filter for automobiles.

[0002]

2. Description of the Related Art Conventionally, a relief check valve of this type shown in FIG. 12 disclosed in US Pat. No. 4,990,247 is known. A cylindrical element 3 having a filter material 2 arranged on the circumferential surface is housed in the oil filter 1, and one cylindrical opening communicates with the outside through the bottom surface of the oil filter 1 and the other. A relief check valve 4 that opens only when an excessive pressure is applied is attached to the opening.

The relief check valve 4 has a communication port 5
A retainer 5 that is formed with a and can cover the opening of the element 3, a valve 6 that covers the communication port 5a of the retainer 5, and the valve 6 is urged against the communication port 5a with a predetermined pressure. It is composed of a spring 7. That is, the valve 6 has a disc portion 6 capable of covering the communication port 5a.
a and four legs 6b standing upright from the same disk portion 6a toward the communication port 5a side, and each leg 6b is connected to the communication port 5a.
It is erected evenly so as to contact the edge portion inside a, and has a claw portion 6b1 protruding outward at the tip. The valve 6 is connected to the communication port 5 from one side of the retainer 5.
The foot 6b is passed through the inside of a, and the coiled spring 7 is attached to the outer circumference of the foot 6b on the opposite surface. The spring 7 is in contact with the peripheral edge of the communication port 5a in the retainer 5 at one end, is compressed, and is locked to the claw portion 6b1 of the foot 6b at the other end. Since the elastic force of the spring 7 tries to push the tip of the foot 6b to the side opposite to the communication port 5a, the retainer 5
The disk portion 6a on the opposite side of is pressed against the retainer 5 to close the communication port 5a.

Normally, the communication port 5a is closed in this way, but when the pressure on the side where the spring 7 is arranged becomes too large, the disc portion 6a is pushed away from the communication port 5a, Part of the oil passes through the communication port 5a. This reduces excessive pressure.

[0005]

In the above-described conventional relief check valve, the foot 6b is erected from the valve 6 that closes the communication port 5a. However, because of the resin molding, the foot 6b is used. The resin will sink around, especially on the back side. However, if the resin sinks in the valve 6 that comes into surface contact with the peripheral edge of the communication port 5a, the surface accuracy is lowered, and a gap is apt to occur, causing a problem of leakage.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a relief check valve capable of maintaining high surface accuracy and preventing leakage.

[0007]

In order to achieve the above object, the invention according to claim 1 is a valve body holding member comprising a communication port and a plurality of legs protruding from the peripheral edge of the communication port,
A cylindrical element that curves toward the edge at the peripheral edge
Retainer that is integrally formed with a support that supports one of the
Na and a covering capable valve member facing the communication port of the valve member holder, the valve is held between the end of the opposite surface and the leg portion and the communication port in the valve member The relief check valve is equipped with a spring for urging the member toward the communication port side.
Cover the opening on one side of the cylindrical element.
It is configured to be mounted as described above.

The invention according to claim 2 is based on claim 1.
In the relief check valve described in (1), the end of the leg has an engaging claw that can be engaged with the spring toward the outside. Further, the invention according to claim 3 is the relief check valve according to claim 1 or 2, wherein the end of the leg has an engaging claw that can be engaged inward with the spring. There is. Further, the invention according to claim 4 is the relief check valve according to any one of claims 1 to 3, wherein the communication port is formed in a recess of the valve body holding member, and the valve member is a protrusion protruding into the recess. A portion is formed, and a rotation restricting mechanism is provided between the concave portion and the convex portion.

Furthermore, the invention according to claim 5, the upper Kiashi unit is a structure erected toward the cylindrical inner side of the element.

[0010]

In the invention according to claim 1 configured as described above, the communication opening of the valve body holding member is closed by the valve member, and the opposite surface of the closed bubble member is formed so as to project to the peripheral edge of the communication opening. A spring is mounted between the valve member and the leg portion, and the valve member is pressed against the periphery of the communication opening of the valve body holding member. Since the valve member is pressed against the peripheral edge of the communication port with a predetermined pressure, it does not open below a predetermined pressure, and opens the communication port when a predetermined pressure difference occurs. Here, since the valve member does not have the leg portion and the surface accuracy is not deteriorated, the valve member can be closely attached to the peripheral edge of the communication port.

Further, in the invention according to claim 2 configured as described above, the engaging claw is formed outward from the end of the leg, and the spring is located outside the leg. Lock to the locking claw. Further, in the invention according to claim 3 configured as described above, the locking claw is formed toward the inside from the end of the leg, and the spring is positioned inside the leg and the locking claw is formed. Lock on. Further, in the invention according to claim 4 configured as described above, the communication port is formed in the concave portion of the valve body holding member, and the convex portion formed in the valve member enters the concave portion to form the communication port. In addition to closing, the rotation restricting mechanism formed between the concave portion and the convex portion restricts the relative rotation of both, so that the positional relationship with respect to the leg portion does not change.

Further, in the invention according to claim 5 configured as described above, since the leg portions are erected toward the inside of the cylinder of the element, the inside of the cylinder which is wastefully vacant is effectively used. To do.

[0013]

As described above, according to the present invention, since it is not necessary to erect the leg portion on the valve member for which the surface accuracy is desired to be maintained, the surface accuracy is prevented from lowering due to the sink of the resin, and the leakage occurs. It is possible to provide a relief check valve that can be eliminated. Further, since the valve member and the spring are mounted from the tip end side of the leg portion protruding from the valve body holding member, the work can be performed only on one side with the valve body holding member as a reference, and the assembling work can be performed. Workability is also improved.

Further, according to the inventions of claims 2 and 3, the position of the spring can be freely set with respect to the leg portion, so that the position of the spring can be changed according to the environment. In particular, if the plurality of legs are alternately provided with locking pawls on the inner side and the outer side, the spring is unlikely to bend inward and outward, and is difficult to disengage from the locking pawls. Further, according to the invention of claim 4, the convex portion of the valve member is inserted into the concave portion of the valve body holding member, and the rotation restricting member prevents the convex portion from rotating. Further, depending on the position where the leg portion is formed, it is necessary to form the window portion on the valve member so as not to interfere with the valve member. However, in this case as well, the valve member does not rotate, so the relative positional relationship between the window portion and the leg portion is It does not change and does not interfere.

Further, according to the invention of claim 5,
In the case of a conventional oil filter, the foot for catching the spring would protrude outside the element, so extra space would be required, whereas the leg part should be projected inside the cylinder that originally has a cavity. This saves more space.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an oil filter to which a relief check valve according to an embodiment of the present invention is applied.

In FIG. 1, the oil filter 10 is provided with a cap-shaped casing 11 which is formed in a cylindrical shape with a bottom and has an opening surface facing downward, and a plate 12 which covers the opening of the casing 11. A drain port 12a is formed in the central portion of 12 and an intake port 12b is formed in the peripheral portion thereof. A filter element 1 in which a filter medium 13c which is folded in a pleat shape between an upper partition plate 13a and a lower partition plate 13b, each of which has a donut shape, is formed in the casing 11 to form a series of peripheral walls.
It houses three.

The filter element 13 is for filtering when oil passes from the outer peripheral surface to the inner peripheral surface by a filter medium 13c forming a peripheral wall, and is provided between the upper partition plate 13a and the ceiling surface of the casing 11. Relief check valve 2
0, the opening of the lower partition plate 13b and the plate 1
The plate 12 is fixed to the opening of the casing 11 with the drain port 12a of No. 2 and the drain port 12a aligned coaxially. The relief check valve 20 has a spring property, and by pressing down while closing the opening of the upper partition plate 13a, the opening edge of the lower partition plate 13b is pressed against the opening peripheral edge of the drain port 12a in the plate 12. The inside of the casing 11 is divided into two chambers by the same filter medium 13c. That is, one communicates with the outside through the intake port 12b, and the other communicates with the outside through the drain port 12a. As a result, when the oil passes from the intake port 12b to the drain port 12a, dust such as iron powder is filtered by the filter medium 13c. A support member 13d formed by bending a metal punching plate into a cylindrical shape is mounted between the upper partition plate 13a and the lower partition plate 13b.

In this embodiment, the relief check valve 20 is mounted inside the oil filter 10 . A space is generated inside the cylindrical filter element 13 as described above, and it is possible to save space by utilizing this space portion. As shown in FIG. 2, the relief check valve 20 has a generally dish-shaped retainer 30.
A valve member 40 having a substantially disc shape, and a coil spring 5
It is composed of 0 and 0.

The retainer 30 has a perforated support portion 31 that curves toward the end portion at the peripheral portion, and a valve body holding member that performs a check valve function in cooperation with the valve member 40 and the coil spring 50 at the central portion. And the member 32. The support portion 31 has a plurality of holes 31a in order to communicate the space on the upper surface side of the valve body holding member 32 with the space inside the casing 11, but it is not always necessary to form the holes 31a, and the valve body holding member is not necessarily formed. Any structure may be used as long as the upper surface side space of 32 communicates with the space inside the casing 11.

The valve body holding member 32 has a circular communication port 33 at the center, and a lower surface side of the communication port 33 is formed with a circular recess 34 which is lower than the surroundings. On the peripheral edge of the opening of the recess 34, four leg portions 35 are formed downward at equal intervals. The leg 35 is a communication port 33
It is arranged on the circumference that is coaxial with and has a locking claw 35a formed at the tip toward the outside. The valve member 40 is composed of a circular convex portion 41 that projects toward the concave portion 34 of the valve body holding member 32 and can be inserted into the concave portion 34, and a circular collar portion 42 that spreads on the peripheral edge of the convex portion 41. Has been done. The tip end surface of the convex portion 41 abuts the inner bottom surface of the concave portion 34, and when the convex portion 41 abuts the opening peripheral edge of the communication opening 33 formed in the concave portion 34, the communication opening 33 can be closed.
On the other hand, the collar portion 42 is formed wider than the projecting range of the leg portion 35, and the leg portion 3 is located at a position where it interferes with each leg portion 35.
A window 43 through which 5 can be inserted is formed. As a result, in the valve member 40, when the convex portion 41 side faces the valve body holding member 32 and the leg portions 35 are inserted into the respective windows 43 and brought into proximity, the convex portion 41 is inserted into the concave portion 34. Finally, the upper end surface of the convex portion 41 closes the communication port 33 in the concave portion 34.

Further, the coil spring 50 has an inner diameter capable of enclosing the cylindrical peripheral surface formed by the outer peripheral surface of the leg portion 35 excluding the locking claw 35a, and the locking claw 35a is formed. By bending the tip of the leg portion 35 inward by an amount corresponding to the above, the leg portion 35 can be mounted on the outer peripheral side. The coil spring 50 is longer than the length of the leg portion 35, and when the coil spring 50 is attached to the outer peripheral side of the leg portion 35, the tip thereof comes into contact with the lower surface of the flange portion 42 of the valve member 40. Further, when the rear end gets over the locking claw 35a, the leg portion 35 opens outward, and thus the leg 35 is locked to the locking claw 35a. This state is shown in FIG. Therefore, since the valve member 40 is biased toward the valve body holding member 32 by the restoring force of the coil spring 50, the pressure at which the oil passes from the upper surface side to the lower surface side of the valve body holding member 32 is the same. If it is smaller than the biasing force of the spring 50, the valve member 40 will be
3 is closed, and when the pressure becomes larger than the urging force, the valve member 40 is pushed down to open the communication port 33.

In the present embodiment, the valve member holder 32 that is supported portion 31 is integrally formed as part of the retainer 30. Further, regarding the valve member 40,
The valve body holding member 32 may have any shape and size capable of closing the communication port 33 on the side where the leg portion 35 is formed,
The shape and the like can be appropriately changed. And
In the coil spring 50, the leg portion 3 is provided on the side of the valve body holding member 32 where the valve member 40 is held.
It suffices that it engages with the valve member 5 and presses the valve member 40 toward the communication port 33. Therefore, the valve member 40 is not limited to the coil spring, and may be formed by a bridge-shaped plate spring or the like that crosses the valve member 40 and has both ends supported by legs. Since the leg portions 35 and the like protruding from the valve body holding member 32 are erected in the internal space portion of the cylindrical filter element 13 as described above, space saving can be achieved.

In such a case, since the valve member 40 does not have a partial projection such as the leg portion 35, so-called resin sink mark does not occur when resin molding is performed. Therefore, the surface accuracy can be increased and the communication port 33
There is no gap when closing the area closely.
On the other hand, when the leg portion 35 is formed on the valve member 40 side, the surface accuracy is lowered due to the sinking of the resin.
A gap is likely to occur. In particular, when a resin material having elasticity is molded, sinking of the resin is likely to occur, which is more effective. Further, when the leg portion 35 is provided on the valve member 40 side, a parting line is formed on the contact surface with the communication port 33 due to the mold forming the locking claw 35a of the leg portion 35. In the case where the leg portion 35 is not formed on the valve member 40 side, the surface accuracy does not deteriorate on the parting line.

Further, although the concave portion 34 is formed on the side of the valve body holding member 32 and the convex portion 41 is formed on the side of the valve member 40, such a concavo-convex structure is not necessarily required. However, when the convex portion 41 is inserted into the concave portion 34, there is an effect that movement in the side direction is restricted and the sitting feeling at the time of mounting is improved. Further, since the surface on which the leg portion 35 is formed and the surface on which the communication port 33 is formed are formed in different steps, it is possible to prevent the sink mark of the resin generated by forming the leg portion 35 from affecting. .

Further, in the concave portion 34, as shown in FIG. 4, a groove 34a is formed on the peripheral surface between the four leg portions 35, and the convex portion 41 side faces the groove 34a. A ridge 41a is formed at a position to be formed. Here, a sufficient gap is formed between the outer peripheral surface of the convex portion 41 and the inner peripheral surface of the concave portion 34 so that oil can pass therethrough.
1a is formed with only a small clearance so that it can slide with respect to the side surface of the groove 34a. Therefore, the oil passes through the gap formed between the outer peripheral surface of the convex portion 41 and the inner peripheral surface of the concave portion 34 between the protrusions 41a,
The protrusion 41a and the groove 34a are engaged with each other to prevent the valve member 40 from freely rotating.

As described above, the collar portion 4 is provided on the valve member 40.
2 has a window 43 for passing the leg portion 35,
When the valve member 40 rotates, the leg portion 35 abuts on the opening edge of the window 43, which tends to cause abnormal noise. However, by forming a mechanism that regulates such rotation, it is possible to prevent abnormal noise. Further, since it is only necessary to regulate the rotation, the protrusion 4
It is not limited to the combination of 1a and the groove 34a, and other similar concavo-convex mechanism may be used. Further, when it is not necessary to regulate the rotation, a gap may be formed between the concave portion 34 and the convex portion 41, so that a protrusion may be formed on one side. At this time, as shown in FIG.
6 is formed on the convex portion 41 side as shown in FIG.
It is also possible not to include a.

As shown in FIG. 7, the leg portion 35 has a locking claw 35a projecting outward at the tip, and holds the coil spring 50 outside. The other end of the coil spring 50 is connected to the valve member 40.
Since the valve member 40 has a larger diameter than the forming range of the leg portion 35, the window 43 is formed in the valve member 40. Therefore, the valve member 40 is held while holding the coil spring 50.
Since it suffices to press it against and urge it, as shown in FIG.
It is also possible to hold the coil spring on the inner peripheral surface side of the leg portion 35 with the locking claw 35a facing inward. In this case, on the valve member 40 side, the leg portion 3 is provided on the outer periphery of the collar portion 42.
The notch 44 may be formed so as not to interfere with the coil 5, but the coil spring 50 may be partially expanded in diameter so that the coil spring 50 contacts, and the coil spring 50 can be appropriately deformed according to the shape of the spring.

Further, depending on the arrangement of the leg portions 35, the locking claws 35a are provided on the inner side, the outer side, and the outer side as shown in FIGS.
It is also possible to change the direction in order. By doing so, the coil spring 50 is supported by the leg portions 35 from both the outside and the inside, so that the deformation in the radial direction is reduced, and as a result, it is difficult to disengage from the locking claw 35a. As described above, the valve body holding member 32 having the communication port 33 has the leg portion 35 that is erected around the communication port 33, and the communication port 33 is provided on the side where the leg portion 35 is erected. Face the valve member 40 to be closed,
Further, a coil spring 5 is provided on the back side of the valve member 40.
Since the other end of the coil spring 50 is locked by the locking claw 35a of the leg portion 35 while abutting 0, the valve member 40 is brought into contact with the communication port 33 at a predetermined pressure to form a relief check valve. The valve member 40 can be made to act and the protrusion of the valve member 40 is eliminated to prevent sinking of the resin, thus improving the surface accuracy.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view of an oil filter to which a relief check valve according to an embodiment of the present invention is applied.

FIG. 2 is an exploded perspective view of a relief check valve.

FIG. 3 is a perspective view of a relief check valve in an assembled state.

FIG. 4 is a bottom view of a valve body holding member in the relief check valve.

FIG. 5 is a bottom view of a valve body holding member according to a modified example of the relief check valve.

FIG. 6 is a bottom view of a valve member corresponding to the valve body holding member.

FIG. 7 is a diagram showing a relationship between an outward engaging claw on a leg portion and a holding position of a coil spring.

FIG. 8 is a diagram showing a relationship between an inward locking claw in a leg portion and a holding position of a coil spring.

FIG. 9 is a plan view of a valve member corresponding to an inward locking claw.

FIG. 10 is a diagram showing a relationship between leg portions in which the direction of locking pawls is alternately changed and a holding position of a coil spring.

FIG. 11 is a plan view of a valve member corresponding to the locking claws whose directions are alternately changed.

FIG. 12 is a partially cutaway side view of an oil filter to which a conventional relief check valve is applied.

[Explanation of symbols]

10 ... Oil filter 13 ... Filter element 20 ... Relief check valve 32 ... Valve holding member 33 ... Communication port 34 ... Recess 34a ... groove 34b ... ridge 35 ... legs 35a ... Locking claw 40 ... Valve member 41 ... Convex part 41a ... ridge 50 ... Coil spring

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Bibliography Sho 61-143615 (JP, U) Rikai Hei 7-16081 (JP, U) Rikai 55-166952 (JP, U) Rikai Hei 4- 93708 (JP, U) Actually open flat 5-3750 (JP, U) Actually open Sho 62-126669 (JP, U) Special table flat 5-501827 (JP, A) U.S. patent 3807651 (US, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16K 15/00-15/20 B01D 27/00-27/10

Claims (5)

(57) [Claims] 1. A valve body holding member having a communication port and a plurality of legs projecting from a peripheral edge of the communication port, and an end portion at a peripheral edge portion.
Curves toward and supports one side of the tubular element
Retainer integrally formed with the valve body holding member, a valve member capable of covering and covering the communication opening of the valve body holding member, a surface of the valve member opposite to the communication opening, and an end of the leg portion. And a spring that is held between the oil filter and the valve member to urge the valve member toward the communication port side.
To cover one opening of the cylindrical element
A relief check valve that is installed . 2. The relief check valve according to claim 1, wherein an end of the leg portion has an engaging claw capable of engaging with the spring toward the outside. 3. The relief check valve according to claim 1 or 2, wherein an end of the leg portion has an engaging claw that is inwardly engageable with the spring. Relief check valve. 4. The relief check valve according to any one of claims 1 to 3, wherein the communication port is formed in a concave portion of the valve body holding member, and the valve member is formed with a convex portion that is inserted into the concave portion. A relief check valve having a rotation restricting mechanism between the concave portion and the convex portion. 5. A relief check valve according to the claims 1 to 4, the relief check valve, characterized in that the upper Kiashi portion is erected toward the cylindrical inner side of the element.