JP2005330898A - Pcv valve - Google Patents

Pcv valve Download PDF

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Publication number
JP2005330898A
JP2005330898A JP2004150032A JP2004150032A JP2005330898A JP 2005330898 A JP2005330898 A JP 2005330898A JP 2004150032 A JP2004150032 A JP 2004150032A JP 2004150032 A JP2004150032 A JP 2004150032A JP 2005330898 A JP2005330898 A JP 2005330898A
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Prior art keywords
pcv
gas flow
flow direction
inner diameter
connecting portion
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Kyoko Saito
恭子 斎藤
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Toyota Motor Corp
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Toyota Motor Corp
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D7/00—Control of flow
    • G05D7/01—Control of flow without auxiliary power
    • G05D7/0126—Control of flow without auxiliary power the sensing element being a piston or plunger associated with one or more springs
    • G05D7/0133—Control of flow without auxiliary power the sensing element being a piston or plunger associated with one or more springs within the flow-path

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a PCV valve capable of suppressing the occurrence of noise more than before and easily regulating a flow rate. <P>SOLUTION: (1) This PCV valve 10 comprises a cylindrical body 20 having a large diameter part 21, a small diameter part 22, and a step part 23 and a valve element 30 axially movably disposed in a body 20, and the inner diameter of the joint part 24 of the body 20 between the small diameter part 22 and the step part 23 is gradually increased toward the upstream side in a PCV gas flow direction.(2) The inner diameter of the joint part 24 is increased, in a part of the peripheral direction, gradually toward the upstream side in the PCV gas flow direction.(3) The inner diameter of the joint part 24 is increased, all the periphery, gradually toward the upstream side in the PCV gas flow direction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、自動車用エンジンのＰＣＶ(Positive Crankcase Ventilation)バルブに関する。   The present invention relates to a PCV (Positive Crankcase Ventilation) valve for an automobile engine.

特開平１０−２３１７１８号公報は、図９に示すように、筒状のボデー２と、ボデー２内に軸方向に可動に配置される弁体３と、メインスプリング４を有する、ＰＣＶバルブ１を開示している。ボデー２は、内径が大の大径部２ａと、大径部２ａよりＰＣＶガス流れ方向下流側に位置し内径が小の小径部２ｂと、大径部２ａと小径部２ｂをつなぐ段部２ｃとを備えている。
上記公報に開示されたＰＣＶバルブ１は、弁体３の形状のみでＰＣＶガス流量を調整している。 As shown in FIG. 9, Japanese Patent Laid-Open No. 10-231718 discloses a PCV valve 1 having a cylindrical body 2, a valve body 3 movably disposed in the body 2 in the axial direction, and a main spring 4. Disclosure. The body 2 includes a large-diameter portion 2a having a large inner diameter, a small-diameter portion 2b having a small inner diameter located downstream of the large-diameter portion 2a in the PCV gas flow direction, and a step portion 2c connecting the large-diameter portion 2a and the small-diameter portion 2b. And.
The PCV valve 1 disclosed in the above publication adjusts the PCV gas flow rate only by the shape of the valve body 3.

上記公報に開示されたＰＣＶバルブ１には、つぎの問題がある。
（ａ） ボデー２の小径部２ｂと段部２ｃとのつなぎ部２ｄが角（エッジ）になっており、空気の流れがつなぎ部２ｄに当り、カルマン渦が発生する。そのカルマン渦が粗密波となり音が発生する。また、空気の流れがつなぎ部２ｄで急激に絞られるので、つなぎ部２ｄの上流と下流での圧力差で音が発生する。その結果、ボデー２と弁体３との隙間から笛鳴き音が発生する。
（ｂ） 流量を決めている弁体３の軸方向位置はボデー２に対してばらつく。そのため、ＰＣＶガス流量ばらつきが大きくなってしまう。したがって、弁体３の形状だけで流量の調整を行うことが困難である。
特開平１０−２３１７１８号公報 The PCV valve 1 disclosed in the above publication has the following problems.
(A) The connecting portion 2d between the small-diameter portion 2b and the step portion 2c of the body 2 is a corner (edge), and the air flow hits the connecting portion 2d, and Karman vortices are generated. The Karman vortex becomes a dense wave and a sound is generated. Further, since the air flow is suddenly throttled at the connecting portion 2d, sound is generated due to the pressure difference between the upstream and downstream of the connecting portion 2d. As a result, a whistling sound is generated from the gap between the body 2 and the valve body 3.
(B) The axial position of the valve body 3 that determines the flow rate varies with respect to the body 2. Therefore, the PCV gas flow rate variation becomes large. Therefore, it is difficult to adjust the flow rate only by the shape of the valve body 3.
Japanese Patent Laid-Open No. 10-231718

本発明が解決しようとする第１の問題点は、ボデーと弁体との隙間から音が発生することである。
本発明が解決しようとする第２の問題点は、ＰＣＶガスの流量調整が困難なことである。
本発明の第１の目的は、音の発生を従来より抑えることができるＰＣＶバルブを提供することにある。
本発明の第２の目的は、流量調整が従来より容易なＰＣＶバルブを提供することにある。 The first problem to be solved by the present invention is that sound is generated from the gap between the body and the valve body.
The second problem to be solved by the present invention is that it is difficult to adjust the flow rate of PCV gas.
A first object of the present invention is to provide a PCV valve that can suppress the generation of sound as compared with the prior art.
The second object of the present invention is to provide a PCV valve whose flow rate is easier to adjust than in the past.

上記目的を達成する本発明はつぎの通りである。
（１） （ａ）内径が大の大径部と、該大径部よりＰＣＶガス流れ方向下流側に位置し内径が小の小径部と、前記大径部と前記小径部をつなぐ段部と、を備える筒状のボデーと、
（ｂ）前記ボデー内に軸方向に可動に配置される弁体と、
を有し、
前記ボデーの小径部と段部とのつなぎ部の内径が、ＰＣＶガス流れ方向上流側にいくにしたがって大とされている、ＰＣＶバルブ。
（２） 前記つなぎ部の内径は、周方向の一部で、ＰＣＶガス流れ方向上流側にいくにしたがって大とされている（１）記載のＰＣＶバルブ。
（３） 前記つなぎ部の内径は、全周にわたって、ＰＣＶガス流れ方向上流側にいくにしたがって大とされている（１）記載のＰＣＶバルブ。
（４） 前記つなぎ部の内径は、該つなぎ部を面取りすることで、ＰＣＶガス流れ方向上流側にいくにしたがって大とされている（１）記載のＰＣＶバルブ。
（５） 前記つなぎ部の内径は、該つなぎ部を断面Ｒ形状にすることで、ＰＣＶガス流れ方向上流側にいくにしたがって大とされている（１）記載のＰＣＶバルブ。 The present invention for achieving the above object is as follows.
(1) (a) a large-diameter portion having a large inner diameter, a small-diameter portion having a small inner diameter located downstream from the large-diameter portion in the PCV gas flow direction, and a step portion connecting the large-diameter portion and the small-diameter portion. A cylindrical body comprising
(B) a valve body disposed movably in the axial direction in the body;
Have
A PCV valve in which the inner diameter of the connecting portion between the small-diameter portion and the step portion of the body is increased toward the upstream side in the PCV gas flow direction.
(2) The PCV valve according to (1), wherein an inner diameter of the connecting portion is a part in a circumferential direction and is increased toward an upstream side in a PCV gas flow direction.
(3) The PCV valve according to (1), wherein an inner diameter of the connecting portion is increased toward the upstream side in the PCV gas flow direction over the entire circumference.
(4) The PCV valve according to (1), wherein the inner diameter of the connecting portion is increased as the connecting portion is chamfered to go upstream in the PCV gas flow direction.
(5) The PCV valve according to (1), wherein an inner diameter of the connecting portion is increased toward the upstream side in the PCV gas flow direction by making the connecting portion into a R-shaped cross section.

上記（１）のＰＣＶバルブでは、ボデーの小径部と段部とのつなぎ部の内径がＰＣＶガス流れ方向上流側にいくにしたがって大とされているので、空気の流れを急激に絞ったり、空気の流れがエッジに当ることを、従来より防止することができる。その結果、従来に比べて、笛鳴き音が発生しにくくなる。
また、内径がＰＣＶガス流れ方向上流側にいくにしたがって大とされている部分の形状等を調整することで、ＰＣＶガスの流量調整を行うことができる。ＰＣＶバルブのボデーの形状で流量調整を行うことができるので、弁体の形状だけで流量調整行う場合（従来）に比べて、調整が容易になる。
上記（２）のＰＣＶバルブでは、つなぎ部の内径が全周にわたってＰＣＶガス流れ方向上流側にいくにしたがって大とされている場合に比べて、狙いの値に対する製品のばらつきを小にすることができる。
上記（３）のＰＣＶバルブでは、つなぎ部の内径が周方向の一部でＰＣＶガス流れ方向上流側にいくにしたがって大とされている場合に比べて、ＰＣＶガス流量を増加させることができる。
上記（４）のＰＣＶバルブでは、つなぎ部を面取りすることでつなぎ部の角（エッジ）を廃止できる。
上記（５）のＰＣＶバルブでは、つなぎ部を断面Ｒ形状にすることでつなぎ部の角（エッジ）を廃止できる。 In the PCV valve of the above (1), the inner diameter of the connecting portion between the small diameter portion and the step portion of the body is increased toward the upstream side in the PCV gas flow direction. Can be prevented from hitting the edge. As a result, the whistling noise is less likely to occur than in the past.
Further, the flow rate of the PCV gas can be adjusted by adjusting the shape of the portion whose inner diameter is increased as it goes upstream in the PCV gas flow direction. Since the flow rate can be adjusted with the shape of the body of the PCV valve, the adjustment is easier than when the flow rate is adjusted only with the shape of the valve body (conventional).
In the PCV valve of the above (2), the variation in the product with respect to the target value can be reduced as compared with the case where the inner diameter of the connecting portion is increased toward the upstream side in the PCV gas flow direction over the entire circumference. it can.
In the PCV valve of the above (3), the PCV gas flow rate can be increased as compared with the case where the inner diameter of the connecting portion is increased in a part of the circumferential direction toward the upstream side in the PCV gas flow direction.
In the PCV valve of the above (4), the corner (edge) of the joint portion can be eliminated by chamfering the joint portion.
In the PCV valve of the above (5), the corner (edge) of the joint portion can be eliminated by making the joint portion have a R-shaped cross section.

図１、図２は、本発明実施例１のＰＣＶバルブを示しており、図３、図４は、本発明実施例２のＰＣＶバルブを示しており、図５、図６は、本発明実施例３のＰＣＶバルブを示しており、図７、図８は、本発明実施例４のＰＣＶバルブを示している。
本発明全実施例に共通する部分には、本発明全実施例で同じ符号を付してある。
まず、本発明全実施例に共通する部分を、たとえば、図１を参照して、説明する。
本発明実施例のＰＣＶバルブは、図示略のクランクケースまたは図示略のシリンダヘッドカバーと、図示略のインテークマニホルドの間に設けられる。本発明実施例のＰＣＶバルブ１０は、図１に示すように、筒状のボデー２０と、ボデー２０内に軸方向に可動に配置される略柱状の弁体３０とを有する。ＰＣＶバルブ１０は、さらに、メインスプリング４０を有する。 1 and 2 show a PCV valve according to Embodiment 1 of the present invention, FIGS. 3 and 4 show a PCV valve according to Embodiment 2 of the present invention, and FIGS. 5 and 6 illustrate the implementation of the present invention. The PCV valve of Example 3 is shown, and FIGS. 7 and 8 show the PCV valve of Example 4 of the present invention.
Portions common to all the embodiments of the present invention are denoted by the same reference numerals in all the embodiments of the present invention.
First, parts common to all the embodiments of the present invention will be described with reference to FIG. 1, for example.
The PCV valve according to the embodiment of the present invention is provided between a crankcase (not shown) or a cylinder head cover (not shown) and an intake manifold (not shown). As shown in FIG. 1, the PCV valve 10 according to the embodiment of the present invention includes a cylindrical body 20 and a substantially columnar valve body 30 that is movably disposed in the body 20 in the axial direction. The PCV valve 10 further has a main spring 40.

ボデー２０は、内径が大の大径部２１と、大径部２１よりＰＣＶガス流れ方向下流側に位置し内径が小の小径部２２と、大径部２１と小径部２２をつなぐ段部２３とを、有する。
小径部２２と段部２３とをつなぐつなぎ部２４には、拡径部５０が形成されている。拡径部５０は、つなぎ部２４のうち、内径がＰＣＶガス流れ方向上流側にいくにしたがって大とされている部分である。
拡径部５０は、つなぎ部２４の周方向の一部のみに形成されていてもよく、つなぎ部２４の全周にわたって形成されていてもよい。つなぎ部２４のうち、拡径部５０が形成されている部分では、つなぎ部２４の角（エッジ）がおとされている。拡径部５０の、ＰＣＶガス流れ方向と直交する方向の長さ（高さ）は、ＰＣＶガス流れ方向の断面視で、ＰＣＶガス流れ方向上流側にいくにしたがって直線状に大とされていてもよく、ＰＣＶガス流れ方向上流側にいくにしたがってＲ状に大とされていてもよい。 The body 20 includes a large-diameter portion 21 having a large inner diameter, a small-diameter portion 22 having a small inner diameter and located downstream of the large-diameter portion 21 in the PCV gas flow direction, and a step portion 23 connecting the large-diameter portion 21 and the small-diameter portion 22. And having.
An enlarged diameter portion 50 is formed in the connecting portion 24 that connects the small diameter portion 22 and the step portion 23. The enlarged diameter portion 50 is a portion of the connecting portion 24 whose inner diameter is increased as it goes upstream in the PCV gas flow direction.
The enlarged diameter portion 50 may be formed only on a part of the connecting portion 24 in the circumferential direction, or may be formed over the entire circumference of the connecting portion 24. In the connecting portion 24, the corner (edge) of the connecting portion 24 is set at a portion where the enlarged diameter portion 50 is formed. The length (height) of the enlarged diameter portion 50 in the direction orthogonal to the PCV gas flow direction is linearly increased as it goes upstream in the PCV gas flow direction in a sectional view of the PCV gas flow direction. Alternatively, it may be increased in an R shape as it goes upstream in the PCV gas flow direction.

弁体３０は、先端側弁体３１と、先端側弁体３１と同芯に配置されて先端側弁体３１よりも大なる径の基端部３２と、先端側弁体３１と基端部３２とを接続する中間部３３とを備えている。
先端側弁体３１は円柱形状またはほぼ円柱形状である。基端部３２は円柱形状またはほぼ円柱形状である。基端部３２の、ＰＣＶガス流れ方向上流側端部には、フランジ３２ａが設けられている。 The valve body 30 includes a distal end side valve body 31, a proximal end portion 32 which is disposed concentrically with the distal end side valve body 31 and has a diameter larger than that of the distal end side valve body 31, and the distal end side valve body 31 and the proximal end portion. The intermediate part 33 which connects 32 is provided.
The distal side valve body 31 has a cylindrical shape or a substantially cylindrical shape. The base end portion 32 has a cylindrical shape or a substantially cylindrical shape. A flange 32a is provided at the upstream end of the base end portion 32 in the PCV gas flow direction.

メインスプリング４０は、ボデー２０内で、段部２３とフランジ３２ａとの間に配置される。メインスプリング４０は、ボデー２０に対して弁体３０をＰＣＶガス流れ方向上流側に付勢している。   The main spring 40 is disposed in the body 20 between the step portion 23 and the flange 32a. The main spring 40 urges the valve body 30 toward the upstream side in the PCV gas flow direction with respect to the body 20.

本発明全実施例に共通する作用、効果を説明する。
本発明実施例では、ボデー２０のつなぎ部２４に拡径部５０が形成されているので、つなぎ部が全周にわたって角（エッジ）になっている場合に比べて、空気の流れを急激に絞ったり、空気の流れが角に当ることを防止することができる。その結果、従来に比べて、笛鳴き音が発生しにくくなる。
また、拡径部５０の、ＰＣＶガス流れ方向長さ（深さ）、ＰＣＶガス流れ方向と直交する方向の長さ（高さ）、ＰＣＶガス流れ方向と直交する方向の断面視での形状等を調整することで、ＰＣＶガスの流量調整を行うことができる。ＰＣＶバルブ１０のボデー２０の深さ、高さ、形状などで流量調整を行うことができるので、弁体３０の形状だけで流量調整を行う場合（従来）に比べて、調整が容易になる。 The operations and effects common to all the embodiments of the present invention will be described.
In the embodiment of the present invention, since the enlarged-diameter portion 50 is formed in the joint portion 24 of the body 20, the air flow is rapidly reduced as compared with the case where the joint portion has an angle (edge) over the entire circumference. Or the air flow can be prevented from hitting the corner. As a result, the whistling noise is less likely to occur than in the past.
Further, the length (depth) of the enlarged diameter portion 50 in the PCV gas flow direction, the length (height) in the direction orthogonal to the PCV gas flow direction, the shape in a cross-sectional view in the direction orthogonal to the PCV gas flow direction, etc. The flow rate of the PCV gas can be adjusted by adjusting. Since the flow rate can be adjusted by the depth, height, shape, etc. of the body 20 of the PCV valve 10, the adjustment is easier than when the flow rate is adjusted only by the shape of the valve body 30 (conventional).

つぎに、本発明の各実施例に特有な部分を説明する。
[実施例１]（図１、図２）
本発明実施例１では、拡径部５０がつなぎ部２４の周方向の一部にのみ形成されている場合を示している。
拡径部５０は、図２に示すように、ＰＣＶガス流れ方向と直交する方向の断面で周方向に４箇所、ボデー２０の軸芯に対して対称な位置に設けられている。拡径部５０の、ＰＣＶガス流れ方向と直交方向の断面形状は、半円形またはほぼ半円形である。
本発明実施例１では、拡径部５０がつなぎ部２４の周方向の一部のみに形成されているので、拡径部５０がつなぎ部２４の全周にわたって形成されている場合に比べて、狙いの値に対する製品のばらつきを小にすることができる。 Next, parts specific to each embodiment of the present invention will be described.
Example 1 (FIGS. 1 and 2)
In the first embodiment of the present invention, a case where the enlarged diameter portion 50 is formed only in a part of the connecting portion 24 in the circumferential direction is shown.
As shown in FIG. 2, the enlarged diameter portion 50 is provided at four positions in the circumferential direction in a direction perpendicular to the PCV gas flow direction and at positions symmetrical to the axis of the body 20. The cross-sectional shape of the enlarged diameter portion 50 in the direction orthogonal to the PCV gas flow direction is semicircular or almost semicircular.
In the first embodiment of the present invention, since the enlarged diameter portion 50 is formed only in a part of the connecting portion 24 in the circumferential direction, compared to the case where the enlarged diameter portion 50 is formed over the entire circumference of the connecting portion 24, The variation of the product with respect to the target value can be reduced.

[実施例２]（図３、図４）
本発明実施例２では、拡径部５０が、つなぎ部２４の全周にわたって高さを低くして形成される部分５０ａと、つなぎ部２４の周方向の一部で高さを高くして形成される部分５０ｂとを、有する場合を示している。
高さを高くして形成される部分５０ｂは、図４に示すように、ＰＣＶガス流れ方向と直交する方向の断面で周方向に４箇所、ボデー２０の軸芯に対して対称な位置に設けられている。高さを高くして形成されている部分５０ｂの、ＰＣＶガス流れ方向と直交方向の断面形状は、三角形である。
本発明実施例２では、拡径部５０がつなぎ部２４の周方向の一部のみに形成されている場合に比べて、ＰＣＶガス流量を増加させることができる。 [Example 2] (FIGS. 3 and 4)
In the embodiment 2 of the present invention, the enlarged diameter portion 50 is formed by increasing the height at a portion 50 a formed by reducing the height over the entire circumference of the connecting portion 24 and by a part in the circumferential direction of the connecting portion 24. The case where it has the part 50b used is shown.
As shown in FIG. 4, the portion 50 b formed with a high height is provided at four positions in the circumferential direction in a direction perpendicular to the PCV gas flow direction, at positions symmetrical to the axis of the body 20. It has been. The cross-sectional shape in the direction orthogonal to the PCV gas flow direction of the portion 50b formed with a high height is a triangle.
In the second embodiment of the present invention, the PCV gas flow rate can be increased as compared with the case where the enlarged diameter portion 50 is formed only in a part of the connecting portion 24 in the circumferential direction.

[実施例３](図５、図６)
本発明実施例３では、拡径部５０が、つなぎ部２４の全周にわたって形成されている場合を示している。
本発明実施例３では、拡径部５０がつなぎ部２４の周方向の一部のみに形成されている場合に比べて、ＰＣＶガス流量を増加させることができる。 Example 3 (FIGS. 5 and 6)
In Example 3 of this invention, the case where the enlarged diameter part 50 is formed over the perimeter of the connection part 24 is shown.
In the third embodiment of the present invention, the PCV gas flow rate can be increased as compared with the case where the enlarged diameter portion 50 is formed only in a part of the circumferential direction of the connecting portion 24.

[実施例４](図７)
本発明実施例４では、拡径部５０が、つなぎ部２４を全周にわたって面取りすることで形成されている場合を示している。
本発明実施例４では、つなぎ部２４を面取りすることでつなぎ部２４の角（エッジ）を廃止できる。 Example 4 (FIG. 7)
In Example 4 of this invention, the case where the enlarged diameter part 50 is formed by chamfering the connection part 24 over the perimeter is shown.
In the fourth embodiment of the present invention, the corner (edge) of the joint portion 24 can be eliminated by chamfering the joint portion 24.

[実施例５](図８)
本発明実施例５では、拡径部５０が、つなぎ部２４を全周にわたって断面Ｒ形状にすることで角をなくして形成されている場合を示している。
本発明実施例５では、つなぎ部２４を断面Ｒ形状にすることで、つなぎ部２４の角（エッジ）を廃止できる。 Example 5 (FIG. 8)
In the fifth embodiment of the present invention, a case is shown in which the enlarged diameter portion 50 is formed without the corners by making the connecting portion 24 into a cross-sectional R shape over the entire circumference.
In Example 5 of this invention, the corner | angular part (edge) of the connection part 24 can be abolished by making the connection part 24 into a cross-sectional R shape.

本発明実施例１のＰＣＶバルブの、ＰＣＶガス流れ方向の断面図である。It is sectional drawing of the PCV gas flow direction of the PCV valve | bulb of this invention Example 1. FIG. 図１の、メインスプリングを除いた、Ａ−Ａ線断面図である。FIG. 2 is a cross-sectional view taken along line AA in FIG. 1 excluding a main spring. 本発明実施例２のＰＣＶバルブの、ＰＣＶガス流れ方向の断面図である。It is sectional drawing of the PCV gas flow direction of the PCV valve | bulb of this invention Example 2. FIG. 図３の、メインスプリングを除いた、Ｂ−Ｂ線断面図である。FIG. 4 is a cross-sectional view taken along the line BB in FIG. 3 excluding the main spring. 本発明実施例３のＰＣＶバルブの、ＰＣＶガス流れ方向の断面図である。It is sectional drawing of the PCV gas flow direction of the PCV valve | bulb of Example 3 of this invention. 図５の、メインスプリングを除いた、Ｃ−Ｃ線断面図である。It is CC sectional view taken on the line of FIG. 5 except the main spring. 本発明実施例４のＰＣＶバルブの、ＰＣＶガス流れ方向の断面図である。It is sectional drawing of the PCV gas flow direction of the PCV valve | bulb of this invention Example 4. FIG. 本発明実施例５のＰＣＶバルブの、ＰＣＶガス流れ方向の断面図である。It is sectional drawing of the PCV gas flow direction of the PCV valve | bulb of this invention Example 5. FIG. 従来のＰＣＶバルブの、ＰＣＶガス流れ方向の断面図である。It is sectional drawing of the PCV gas flow direction of the conventional PCV valve | bulb.

符号の説明Explanation of symbols

１０ ＰＣＶバルブ
２０ ボデー
２１ 大径部
２２ 小径部
２３ 段部
２４ つなぎ部
３０ 弁体
３１ 先端側弁体
３２ 基端部
３２ａ フランジ
３３ 中間部３３
４０ メインスプリング
５０ 拡径部 DESCRIPTION OF SYMBOLS 10 PCV valve 20 Body 21 Large diameter part 22 Small diameter part 23 Step part 24 Joint part 30 Valve body 31 Front end side valve body 32 Base end part 32a Flange 33 Intermediate part 33
40 Main spring 50 Expanded part

Claims (5)

（ａ）内径が大の大径部と、該大径部よりＰＣＶガス流れ方向下流側に位置し内径が小の小径部と、前記大径部と前記小径部をつなぐ段部と、を備える筒状のボデーと、
（ｂ）前記ボデー内に軸方向に可動に配置される弁体と、
を有し、
前記ボデーの小径部と段部とのつなぎ部の内径が、ＰＣＶガス流れ方向上流側にいくにしたがって大とされている、ＰＣＶバルブ。 (A) A large-diameter portion having a large inner diameter, a small-diameter portion having a small inner diameter located downstream in the PCV gas flow direction from the large-diameter portion, and a step portion connecting the large-diameter portion and the small-diameter portion. A tubular body,
(B) a valve body disposed movably in the axial direction in the body;
Have
A PCV valve in which the inner diameter of the connecting portion between the small-diameter portion and the step portion of the body is increased toward the upstream side in the PCV gas flow direction. 前記つなぎ部の内径は、周方向の一部で、ＰＣＶガス流れ方向上流側にいくにしたがって大とされている請求項１記載のＰＣＶバルブ。   2. The PCV valve according to claim 1, wherein an inner diameter of the connecting portion is a part in a circumferential direction and is increased toward an upstream side in a PCV gas flow direction. 前記つなぎ部の内径は、全周にわたって、ＰＣＶガス流れ方向上流側にいくにしたがって大とされている請求項１記載のＰＣＶバルブ。   2. The PCV valve according to claim 1, wherein an inner diameter of the connecting portion is made larger toward the upstream side in the PCV gas flow direction over the entire circumference. 前記つなぎ部の内径は、該つなぎ部を面取りすることで、ＰＣＶガス流れ方向上流側にいくにしたがって大とされている請求項１記載のＰＣＶバルブ。   2. The PCV valve according to claim 1, wherein an inner diameter of the connecting portion is increased as the connecting portion is chamfered so as to go upstream in the PCV gas flow direction. 前記つなぎ部の内径は、該つなぎ部を断面Ｒ形状にすることで、ＰＣＶガス流れ方向上流側にいくにしたがって大とされている請求項１記載のＰＣＶバルブ。   2. The PCV valve according to claim 1, wherein an inner diameter of the connecting portion is increased toward the upstream side in the PCV gas flow direction by forming the connecting portion into an R-shaped cross section.
JP2004150032A 2004-05-20 2004-05-20 Pcv valve Pending JP2005330898A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2004150032A JP2005330898A (en) 2004-05-20 2004-05-20 Pcv valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2004150032A JP2005330898A (en) 2004-05-20 2004-05-20 Pcv valve

Publications (1)

Publication Number Publication Date
JP2005330898A true JP2005330898A (en) 2005-12-02

Family

ID=35485740

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2004150032A Pending JP2005330898A (en) 2004-05-20 2004-05-20 Pcv valve

Country Status (1)

Country Link
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009293599A (en) * 2008-06-09 2009-12-17 Toyota Motor Corp Flow control valve of internal-combustion engine
JP2014040791A (en) * 2012-08-22 2014-03-06 Aisan Ind Co Ltd Flow rate control valve
US9587751B2 (en) 2012-12-27 2017-03-07 Aisan Kogyo Kabushiki Kaisha Flow control valves

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009293599A (en) * 2008-06-09 2009-12-17 Toyota Motor Corp Flow control valve of internal-combustion engine
JP2014040791A (en) * 2012-08-22 2014-03-06 Aisan Ind Co Ltd Flow rate control valve
US9587751B2 (en) 2012-12-27 2017-03-07 Aisan Kogyo Kabushiki Kaisha Flow control valves

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