JP2000110538A - Mounting structure for pcv valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To satisfy both firmly mounting of a PCV valve and sufficiently ensuring of seal performance relating to a separator. SOLUTION: A PCV valve 6 is fitted to a mounting cylinder part 4 formed in an upper part of a separator 3 separating oil mist of an engine and blow-by gas. A cap part 22 is integrally molded in the mounting cylinder part 4, a lock hole 23 formed in the cap part 22 is engaged with a lock pawl part 21 formed in the mounting cylinder part 4, and coming-off from the mounting cylinder part 4 of the PCV valve 6 is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure for a PCV valve.

[0002]

2. Description of the Related Art In an engine, particularly an automobile engine,
The gas leaked from the combustion chamber into the crankcase, that is, the blow-by gas, is separated from oil mist by a separator, and then recirculated to the engine intake system to be reburned. A blow-by gas recirculation passage connecting the separator and the engine intake system has a PCV valve (Positive Crackcase Venti) for controlling the recirculation of blow-by gas.
ration valve) is provided, usually PCV
The valve is often attached and fixed to the separator. Conventionally, to attach a PCV valve to a separator, a rubber grommet is fitted tightly into a mounting hole formed in the separator, and a PC grommet is inserted into a mounting hole formed in the grommet.
This has been done by tightly fitting the V-valve.

[0003]

However, in the conventional mounting method, since only the holding action using the elastic force of rubber is used, the reliability of the mounting is not always sufficient.
Further, since the grommet has both the function of attaching and holding the PCV valve and the function of sealing, the sealing property is not always satisfactory.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a PCV valve capable of satisfying both a firm attachment of a PCV valve to a separator and a sufficient sealing performance. It is to provide a mounting structure.

[0005]

In order to achieve the above-mentioned object, the present invention adopts the following solution. That is, as described in claim 1 of the appended claims, it is attached to a separator that separates oil mist and blow-by gas of the engine, and is interposed in a blow-by gas recirculation passage that connects the separator to the intake system of the engine. In the mounting structure of the PCV valve, the mounting cylinder portion is formed in the separator, the PCV valve is fitted in the mounting cylinder portion, and the detachable engagement member prevents the PCV valve from coming off from the mounting cylinder portion. The combining means is the PC
The V-valve and the mounting cylinder are formed integrally with each other, and the fitting portion between the mounting cylinder and the PCV valve is sealed by a seal ring. Preferred embodiments on the premise of the above solution are as described in claim 2 and the following claims.

[0006]

According to the first aspect of the present invention, the PCV valve is fitted to the mounting cylinder of the separator, and the PV valve is engaged by using the engaging means.
Since it prevents the CV valve from coming off from the mounting cylinder, PC
The V-valve can be firmly attached to the separator, and can maintain firm attachment for a long period of time even when subjected to vibration or the like. In addition, the seal ring seals the mounting portion of the PCV valve with respect to the separator, but the seal ring only needs to perform only the sealing action, so that the sealing property is sufficiently ensured. Further, at the time of inspection, etc., the engagement means is disengaged and the PC
The V valve can be easily removed from the separator, which is preferable in terms of maintainability. In addition to the above, since the engagement means is integrally formed with the mounting cylinder and the PCV valve, it is preferable in terms of reducing the number of parts.

According to the second aspect, the engaging means can have a simple structure. According to the third aspect, the PCV valve can be easily removed from the mounting cylinder by simply pulling the PCV valve from the mounting cylinder after rotating in the predetermined direction. According to the fourth aspect, the same effect as the third aspect can be obtained. Further, it is preferable to easily release the engagement while maintaining a reliable engagement state by utilizing a large elastic deformation of the leg formed on the PCV valve.

According to the fifth aspect, the engagement state can be automatically obtained by inserting the PCV valve into the mounting cylinder so that the bulging portions are fitted to each other. Also, PC
Utilizing a sufficient elastic deformation of the bulging portion formed in the V-valve, it is preferable in that the engagement is easily released while the reliable engagement is maintained. In addition, by visually checking the locking hole formed in the mounting cylinder from the outside, it is possible to easily confirm whether or not the engagement state is established.

According to claim 6, the PCV in the engaged state.
In order to remove the valve from the mounting cylinder portion, two movements in different directions are required, which is extremely preferable for reliably maintaining the engaged state. According to the seventh aspect, a more specific configuration for obtaining the effect corresponding to the sixth aspect is provided.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, a separator 3 for separating oil mist generated in the crankcase 2 from blow-by gas is attached to a side surface of the crankcase 2 of the engine 1. . This separator 3
Is formed of a synthetic resin, and a mounting cylinder portion 4 is formed on an upper portion thereof. A part of the PCV valve 6 is fitted into the mounting cylinder portion 4 via a seal ring (for example, an O-ring) 5, and the PCV valve 6 is prevented from coming off from the mounting cylinder portion 5 as described later. This is performed by engaging a first engaging means integrally formed with the cylindrical portion 4 and a second engaging means integrally formed with the PCV valve 6 with each other.
The blow-by gas is recirculated to the engine intake system via the PCV valve 6, and therefore, the PCV valve 7 and the engine intake system are connected by a rubber hose or the like (not shown).

FIGS. 2 to 4 show a PCV with respect to the mounting cylinder 4.
The details of the manner of mounting the valve 6 are shown. First, (the casing of) the PCV valve 6 sequentially moves from above to below.
It has a small-diameter outflow cylindrical portion (second cylindrical portion) 6a, a large-diameter portion 6b, a medium-diameter portion 6c, and an inflow cylindrical portion (first cylindrical portion) 6d. The communication passage in the mounting cylinder 4, that is, the separator 3 through the mounting cylinder 4
The inside diameter of the open end portion 10d to the outside of the communication passage 10 communicating with the inside is set to a size in which the large-diameter portion 6b is fitted without looseness. The lower portion of the open end 10d of the communication passage 10 is formed of three portions 10a, 10b, and 10c whose inner diameters are gradually reduced from top to bottom.
It consists of.

The large diameter portion 6b of the PCV valve 6 is
(The inner diameter portion 10d), and the middle diameter portion 6c
Are fitted to 10a without play, and the inflow cylinder 6d is
c, and the seal ring 5 is further fitted to 10b. That is, the seal rings 5 are 10b and 10c
In the state where the falling-out toward the inside of the separator 3 is regulated by the stepped portion, the sealing action is performed at the outer peripheral portion of the inflow cylinder portion 6d.

A plurality (three in this embodiment) of locking claws 21 are formed on the outer peripheral surface of the mounting cylinder 4 at intervals in the circumferential direction. The locking claw portion 21 has a first inclined surface 21a which is gradually reduced as it goes upward on a protruding end surface (a surface on the radially outward side of the mounting cylinder portion 4). In addition, a second inclined surface (side inclined surface) 21b of which the protruding height gradually decreases is formed on one surface in the circumferential direction of the mounting cylinder portion 4 of the locking claw portion 21.

The cap portion 22 is integrally formed with the PCV valve 6 at the upper edge of the large diameter portion 10b. The cap portion 22 includes a top plate portion 22a (a flange portion of the large diameter portion 6b) whose outer peripheral shape is flush with the large diameter portion 6b, and the top plate portion 22a is cylindrically downward from the outer peripheral edge portion. The inner wall of the peripheral wall portion 22b has a size that can be fitted to the outer periphery of the mounting cylinder portion 4 without play. On the peripheral wall portion 22b, corresponding to the locking claw portion 21,
A plurality (three in the embodiment) of locking holes (locking step portions) 23 are formed at intervals in the circumferential direction. The inner peripheral surface of each locking hole 23 is formed so as to be parallel to the radial direction of the cap portion 22 so that the PCV valve 6 can be formed by a mold divided into two in the radial direction (FIG. 4). 2 vertically
Chopped). The PCV valve 6 (the casing thereof) having such a cap portion 22 is an integrally molded product made of a synthetic resin including the cap portion 22.

The attachment of the PCV valve 6 to the attachment cylinder 4 is performed in the following procedure. First, PCV valve 6
With the seal ring 5 fitted and held on the outer periphery of the inflow cylinder portion 4d, the PCV valve 6 is fitted or inserted into the mounting cylinder portion 4 from the inflow cylinder portion 4d side. At this time, PC
The relative rotation position of the V-valve 6 with respect to the mounting cylinder portion 4 is such that the engagement is performed such that the engagement claw portion 21 and the engagement hole 23 coincide with each other.

When the peripheral wall portion 22b of the cap portion 22 (opening end face downward) comes into contact with the locking claw portion 21 of the mounting cylinder portion 4, the resistance in the fitting direction increases, but the first inclination is increased. Face 21
Due to the guide action (cam action) a, the fitting progresses while the area near the contact with the locking claw part 21 is forcibly elastically deformed partially in the radially expanding direction. With the progress of the fitting, the locking claw 21 eventually enters or engages with the locking hole 23, and the mounting is completed as shown in FIGS. 3 and 4 (the connection between the locking claw 21 and the locking hole 23). Cap part 22 by engagement, ie PCV
The valve 6 is prevented from coming off from the mounting cylinder 4). Locking claw 21
It is easily confirmed whether or not the locking hole 23 is properly engaged with the locking hole 23 by visually checking the locking hole 23 from the outside.

As described above, when the PCV valve 6 is mounted, it is only necessary to press the PCV valve 6 against the mounting cylinder portion 4 in the axial direction, so that the mounting becomes extremely simple. In addition, the cap part 22 (especially the top plate part 22a)
Thereby, the outer opening end of the mounting cylinder 4 is completely covered, which is preferable in preventing foreign substances from entering the mounting cylinder 4 from this portion.

In order to remove the PCV valve 6 from the mounting cylinder 4 from the mounting completed state in FIGS. 3 and 4, the following procedure is performed. First, the PCV valve 6 is rotated counterclockwise in FIG. Thereby, the second inclined surface 2 of the locking claw portion 21 is formed.
By the guide action (cam action) of 1b, the cap portion 2
The engagement between the locking hole 23 and the locking claw 21 is released while the vicinity of the locking hole 23 of the second peripheral wall portion 22b is forcibly elastically deformed in the radially expanding direction. After that, the PCV valve 6 may be pulled out of the mounting cylinder 4. As described above, the removal of the PCV valve 6 can be performed by a simple operation of two motions, namely, rotation of the cap member 7 in a predetermined circumferential direction and subsequent withdrawal.

The second inclined surface 21b as a side inclined surface is
Instead of, or in addition to, the locking claw portion 21, the locking claw portion 21 may be formed on the inner circumferential surface on one side in the circumferential direction of the locking hole 23. Further, the locking step portion with which the locking claw portion 21 is engaged can be formed as a concave portion having a back wall (bottom wall) instead of a hole type like the locking hole 23. The locking claw 21 may be formed on the PCV valve 6 and the locking step may be formed on the mounting cylinder 4.

FIGS. 5 and 6 show a second embodiment of the present invention, in which the same elements as those in the above embodiment are denoted by the same reference numerals (this is the same as in another embodiment described below). The same applies to). In the present embodiment, a locking recess 25 as a locking step is formed on the outer surface of the mounting cylinder 4. The bottom surface 25a of the locking recess 25 extends in parallel with the diametrical direction of the mounting cylinder 4, and one end thereof is flush with the outer peripheral surface of the mounting cylinder 4 so as to be one side in the circumferential direction of the mounting cylinder 4. (The locking recess 25 is gradually made shallower toward one side in the circumferential direction).

On the other hand, the PCV valve 6 is integrally formed with a leg 26 extending downward from the large diameter portion 4b.
A locking claw 27 is integrally formed at the front end (lower end) of No. 6. In the embodiment, the locking recess 25 and the locking claw 2
7 (leg 26) shows a case in which only one set is provided, but a plurality of sets of the locking recess 25 and the locking claw 27 (leg 26) may be provided at intervals in the circumferential direction. .

Also in this embodiment, the work of attaching and detaching the PCV valve 6 to and from the attachment cylinder 4 is performed in the same manner as in the above-described embodiment. That is,
At the time of mounting, the PCV valve 6 is fitted to the mounting tubular portion 4 such that the circumferential positions of the locking claw portions 27 and the locking concave portions 25 match. When the PCV valve 6 is removed, the PCV valve 6 is rotated counterclockwise in FIG. 6 to disengage the locking claw 27 from the locking recess 25 by the cam action of the bottom surface 25a of the locking recess 25. P
This is performed by pulling out the CV valve 6 from the mounting cylinder 4 (removal by two motions).

FIGS. 7 and 8 show a third embodiment of the present invention. In the present embodiment, of the mounting cylinder 4,
A bulging portion 31 is formed by bulging a part in the circumferential direction outward in the radial direction over the entire length. A locking hole 32 as a locking step portion is provided on a protruding side surface of the bulging portion 31 (a surface farthest in a radial direction of the mounting cylinder portion 4 and a surface along the circumferential direction of the mounting cylinder portion 4). Are formed. The bulging portion 31 extends in parallel with the axis of the mounting tube portion 4, and a fitting groove portion 33 is formed in the inner diameter portion of the mounting tube portion 4 with the formation of the bulging portion 31. Will be.

On the other hand, the large diameter portion 4b of the PCV valve 4
A projecting portion 34 is formed on substantially the entire length of the large diameter portion 4b. A locking claw 35 is integrally formed on the surface of the protruding portion 34 on the protruding side. Projection 3
The cross-sectional outer peripheral shape of 4 corresponds to the cross-sectional shape of the fitting groove 33, and can be fitted into the fitting groove 33 almost without rattling. In addition, behind the projecting portion 34 (the large diameter portion 6)
b), a gap, that is, a space 36 is formed, so that at least the locking claw portion 35 of the protruding portion 34 can be sufficiently elastically deformed in the radial direction of the large diameter portion 6b.

In this embodiment, when the PCV valve 6 is mounted on the mounting cylinder 4, the PCV valve 6 is mounted such that the circumferential positions of the locking claw 35 and the locking hole 32 coincide. This is performed by fitting to the cylindrical portion 4.
That is, the fitting of the PCV valve 56 to the mounting tubular portion 4 is performed while the projecting portion 34 is fitted to the bulging portion 31 (fitting groove portion 33). Then, the fitting progresses, and the mounting is completed in a state where the locking claw portions 35 are engaged with the locking holes 32 (see FIG. 8).

When the PCV valve 6 is removed, the locking claw 35 is pressed from the outside of the mounting cylinder 4 through the locking hole 32 with a tapered tool or the like, so that the locking claw 35 and the locking hole are removed. 32 with the PCV valve 6 released.
Is pulled out of the mounting cylinder 4. Since the protruding portion 34 is sufficiently elastically deformable in the radial direction of the PCV valve 6, the engagement of the locking claw 35 from the locking hole 32 due to the pressing may damage the PCV valve 6. Done without.

FIGS. 9 and 10 show a fourth embodiment of the present invention. In the present embodiment, the PCV valve 6 is prevented from coming off from the mounting cylinder 4 by rotating the PCV valve 6 relative to the mounting cylinder 4 by a predetermined angle in a predetermined direction from a predetermined relative rotation position (first position). (1 engaging means), the return rotation from the state of being rotated by the predetermined angle toward the predetermined relative rotation position is prevented by using the locking claw portion (second engaging means).

More specifically, a plurality of (two in the embodiment) relief portions 41 are provided on the top surface, that is, the opening end surface of the mounting cylinder portion 4.
Is formed, and a predetermined direction (see FIG.
0 The locking wall 42 is formed at a position shifted by a predetermined angle in the counterclockwise direction. The relief portion 41 has a form that is opened (exposed) to the top surface side of the mounting cylinder portion 4.
Numeral 2 is a type of a tongue extending from the outer peripheral edge of the mounting cylinder portion 4 to the radially inward side thereof. That is, the space 43 below the locking wall portion 42 is in a state of communicating with the escape portion 41 in the circumferential direction of the mounting cylinder portion 4. A locking step 44 is further formed on the top surface of the mounting cylinder 4.

On the other hand, the PCV valve 6 has a large diameter portion 4.
A plurality (two in the embodiment) of projections 45 projecting outward in the radial direction are formed near the upper edge of b. The projection 45 corresponds to the relief 41, and the projection 45 is aligned with the relief 41 by setting the PCV valve 6 at a predetermined relative rotational position with respect to the mounting cylinder 4. The protrusion amount (radial length of the PCV valve 6) and the thickness of the protrusion 45 are determined by rotating the PCV valve 6 from the predetermined relative rotation position with respect to the mounting cylinder 4 in the counterclockwise direction in FIG. (In the direction toward 42), it is set such that it can be positioned below the locking wall portion 42 while avoiding interference with the locking wall portion 42.

The PCV valve 6 further includes a large diameter portion 4b.
A substantially elongated leg 46 extending substantially concentrically with the large diameter portion 4b is formed integrally from the vicinity of the upper end edge of the leg 46.
A locking claw portion 47 is integrally formed on the lower surface of the distal end portion.
The locking claw 47 corresponds to the locking step 44, and in the state of FIG. 10 in which the projection 45 is aligned with the relief 41, the engagement with the locking step 44 is released, and the projection is formed. When the lock 45 is located below the lock wall 42, the lock 45 is engaged with the lock step 44.

When mounting the PCV valve 6, the PC
The V-valve 6 is set at a predetermined relative rotational position with respect to the mounting cylinder 4 so that the projection 45 aligns with the escape part 41, and the lower surface of the projection 45 is seated on the top surface of the mounting cylinder 4. From this state, the PCV valve 6 is rotated counterclockwise in FIG. 10 with respect to the mounting cylinder 4 to bring the locking claw 47 into engagement with the locking step 44. The locking claw portion 47 is the locking step portion 44.
Is engaged with the locking wall 4
2, the removal of the PCV valve 6 from the mounting cylinder 4 is restricted. In a state where the locking claw portion 47 is just engaged with the locking step portion 44, the projection portion 45 comes into contact with a stopper wall portion 48 formed on the top surface of the mounting cylinder portion 4, and
Further rotation of the PCV valve 6 in the counterclockwise direction in FIG. 10 is restricted.

When removing the PCV valve 6, the PCV valve 6 is attached to the mounting cylinder 4 with the locking claw 47 disengaged from the locking step 44 using fingers or a tool.
10 in the clockwise direction in FIG. 10, the protrusion 45 is returned to the position where the protrusion 45 is displaced from the locking wall 42, that is, the predetermined relative rotation position aligned with the relief 41, and from this state, the PCV is rotated.
The valve 6 may be pulled out of the mounting cylinder 4.

In the present embodiment, the prevention of the PCV valve 6 from being detached from the mounting cylinder portion 4 is carried out solely by pressing the projection 45 with the locking wall portion 42 and the locking claw portion 47 (locking step). The part 44) does not need to counter external force in the pull-out direction (the locking claw 47 and the locking step 44 have a function of exclusively preventing rotation of the PCV valve 6 toward a predetermined relative rotation position). Just do it). The locking claw 47 (locking step 44) can be set so as to be located on the side surface instead of the top surface of the mounting cylinder 4, and the locking claw 47 and the locking step can be set. A plurality of sets can be provided at intervals from the part 44 in the circumferential direction of the mounting cylinder part 4.

Although the embodiment has been described, the PCV
As the internal structure (valve structure) of the valve 6, a conventionally known appropriate structure can be adopted, and the external shape (casing shape) of the PCV valve 6 is a shape that can be fitted to the mounting cylinder 4. However, the present invention is not limited to those shown in the embodiments. The purpose of the present invention is not limited to what is explicitly specified, but also implicitly includes providing what is substantially preferred or expressed as an advantage.

[Brief description of the drawings]

FIG. 1 is an overall exploded perspective view showing a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of a main part in the first embodiment.

FIG. 3 is a side cross-sectional view of a main part showing a PCV valve according to the first embodiment in a state where mounting of the PCV valve is completed.

FIG. 4 is a cross-sectional view of a main part corresponding to a line X4-X4 in FIG. 3, illustrating an engagement relationship between a locking claw portion of a mounting cylinder portion and a locking hole of a PCV valve.

FIG. 5 is an exploded perspective view of a main part showing a second embodiment of the present invention.

FIG. 6 shows a second embodiment of the present invention, and is a cross-sectional view of a main part corresponding to FIG.

FIG. 7 is an exploded perspective view of a main part showing a third embodiment of the present invention.

FIG. 8 shows a third embodiment of the present invention, and is a side sectional view of a main part corresponding to FIG.

FIG. 9 is an exploded perspective view of a main part showing a fourth embodiment of the present invention.

FIG. 10 shows a fourth embodiment of the present invention, and is a top view of a main part at a predetermined relative rotation position where a protrusion and a relief are aligned.

[Description of sign]

 1: Engine 3: Separator 4: Mounting cylinder part 5: Seal ring 6: PCV valve 6a: Outflow cylinder part 6b: Large diameter part 6c: Medium diameter part 6d: Inflow cylinder part 21: Locking claw part 21a: First inclination Surface 21b: Second inclined surface (lateral inclined surface) 22: Cap portion 23: Locking hole 25: Locking concave portion 26: Leg 27: Locking claw portion 31: Swelling portion 32: Locking hole 33: Fitting Mating groove part 34: Projecting part 35: Locking claw part 36: Space 41: Escape part 42: Locking wall part 43: Lower space 44: Locking step part 45: Projection part 46: Leg part 47: Locking claw part

Claims (7)

[Claims] 1. A mounting structure for a PCV valve mounted on a separator that separates oil mist and blow-by gas from an engine, and interposed in a blow-by gas recirculation passage connecting the separator to an intake system of the engine. A mounting cylinder portion is formed, the PCV valve is fitted into the mounting cylinder portion, and a detachable engagement means for preventing the PCV valve from coming off from the mounting cylinder portion is provided with the PCV valve and the mounting cylinder portion. And a fitting portion between the mounting tubular portion and the PCV valve is sealed by a seal ring. 2. The locking claw according to claim 1, wherein the engagement means is formed by a locking claw formed on one of the PCV valve and the mounting cylinder and a locking claw formed on the other. The PCV valve is fitted to the mounting cylinder at a predetermined relative rotational position, whereby the locking claw is engaged with the engaging step. Are set to match
A mounting structure for a PCV valve, characterized in that: 3. The PCV valve according to claim 2,
A cap portion fitted to the outer periphery of the mounting tube portion is formed, and the locking step portion is formed on one of the cap portion and the mounting tube portion, and the locking claw portion is formed on the other. A laterally inclined surface is formed on a side surface of the locking claw portion, and the P
The engagement between the locking claw and the locking step is released by rotating the CV valve with respect to the mounting cylinder from the side inclined surface side so as to ride on the locking step. ,
A mounting structure for a PCV valve, characterized in that: 4. The PCV valve according to claim 2, wherein the PCV valve is formed with a leg extending in a fitting direction with respect to the mounting cylinder, the locking claw is formed on the leg, and the locking step is formed. , Formed as a locking concave portion formed on the outer peripheral surface of the mounting cylinder portion, the bottom surface of the locking concave portion, the bottom of the locking concave portion gradually toward a predetermined one of the circumferential direction of the mounting cylindrical portion The locking claw portion is disengaged from the locking concave portion by rotating the PCV valve in the predetermined one direction with respect to the mounting cylinder portion. P
Mounting structure for CV valve. 5. The swelling portion according to claim 2, wherein a swelling portion swelling radially outward is formed on a part of a side wall of the mounting cylinder portion. A locking hole is formed as a portion, a protrusion is formed on the PCV valve so as to be fitted to the bulging portion substantially without rattling, and the locking claw portion is formed on an outer peripheral surface of the protrusion. In a state where the locking claw portion is engaged with the locking hole, an external force is applied to the locking claw portion from the outside of the mounting cylinder portion, so that the locking hole and the locking claw are provided. The mounting structure of a PCV valve, wherein the engagement with the part is released. 6. The device according to claim 1, wherein the engaging means rotates the PCV valve in a predetermined direction from the predetermined relative rotation position after fitting the PCV valve to the mounting cylinder at a predetermined relative rotation position. A mounting structure for a PCV valve, wherein the PCV valve is set so that the PCV valve is prevented from coming off from the mounting cylinder portion and rotation in a direction opposite to the predetermined direction is sometimes restricted. 7. The PCV valve according to claim 6, wherein the engagement means includes: a projection formed on an outer periphery of the PCV valve; a locking claw formed on the PCV valve; A relief portion formed and aligned with the protrusion at the predetermined relative rotation position, formed on the top surface of the mounting cylinder portion, and rotating the PCV valve in the predetermined direction from the predetermined relative rotation position,
A locking wall that covers the protrusion to prevent the PCV valve from coming off the mounting cylinder; and a locking wall formed on the mounting cylinder, wherein the projection is locked by the locking wall. A locking step for preventing the PCV valve from rotating in a direction opposite to the predetermined direction with respect to the mounting cylinder by engaging the locking claw;
A mounting structure for a PCV valve, comprising: