WO2010103662A1 - Breather plug - Google Patents

Breather plug Download PDF

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Publication number
WO2010103662A1
WO2010103662A1 PCT/JP2009/054935 JP2009054935W WO2010103662A1 WO 2010103662 A1 WO2010103662 A1 WO 2010103662A1 JP 2009054935 W JP2009054935 W JP 2009054935W WO 2010103662 A1 WO2010103662 A1 WO 2010103662A1
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WO
WIPO (PCT)
Prior art keywords
housing
fluid passage
diameter portion
breather plug
atmosphere
Prior art date
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PCT/JP2009/054935
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French (fr)
Japanese (ja)
Inventor
英二 市岡
秀人 渡邉
功 佐藤
Original Assignee
トヨタ自動車株式会社
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Publication date
Application filed by トヨタ自動車株式会社 filed Critical トヨタ自動車株式会社
Priority to PCT/JP2009/054935 priority Critical patent/WO2010103662A1/en
Publication of WO2010103662A1 publication Critical patent/WO2010103662A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K24/00—Devices, e.g. valves, for venting or aerating enclosures
    • F16K24/04—Devices, e.g. valves, for venting or aerating enclosures for venting only

Definitions

  • the present invention relates to a breather plug that is attached to a housing such as a power transmission device mounted on a vehicle and opens the inside of the housing to the atmosphere.
  • a vehicle equipped with a driving force source such as an engine is equipped with a power transmission device (trans-askul) that transmits the driving force generated by the driving force source to driving wheels.
  • the casing (case) of the power transmission device is provided with a breather plug in order to adjust the pressure inside the casing (see, for example, Patent Document 1).
  • the breather plug 301 of this example is a hermetic type breather plug, and is disposed above the valve seat 322, a plug main body 302 having a vent hole 321 formed at the center and a valve seat 322 formed at the upper portion.
  • the mounting portion 302a of the main body 302 is attached to the housing by screwing it into a boss hole (not shown) of the housing.
  • the breather plug 301 having such a structure, in a normal state (when the pressure in the housing is not increased), as shown in FIG. It is seated on 322 and prevents foreign matter from entering the housing from the outside.
  • the valve body 303 is removed from the valve seat 322 as shown in FIG. It has a structure in which it is separated and the inside of the housing is opened to the atmosphere.
  • the power transmission device of the hybrid vehicle has a built-in electric motor.
  • the insulation resistance may drop, and electric leakage may occur.
  • the atmospheric pressure inside the housing is detected, and when the detected atmospheric pressure is low, voltage control is performed according to the atmospheric pressure inside the housing, such as lowering the boosted voltage of the motor.
  • the valve body 322 When the hermetic breather plug shown in FIG. 11 is used for such a power transmission device, for example, the valve body 322 is opened during traveling at a high altitude where the atmospheric pressure is low, and the atmospheric pressure inside the housing is lowered. When is closed, the pressure inside the housing is kept low. And when it returns to a flat ground driving
  • An air-release type breather plug includes, for example, a housing in which one end communicates with the inside of the housing and the other end is open to the atmosphere, a valve seat provided in the fluid passage, A check ball (valve body) is provided on the atmosphere side of the valve seat and closes the fluid passage while seated on the valve seat. When the pressure inside the housing rises, the check ball rises from the valve seat The inside of the housing is open to the atmosphere through a gap between the check ball and the inner surface of the passage (see, for example, Patent Document 2).
  • a check ball is disposed in the passage.
  • Patent Document 3 a spiral member is provided in a cylindrical container having a gas inflow pipe and a gas outflow pipe, and a swirling flow of gas is generated in the container, and oil content in the gas is separated by the swirling flow.
  • An apparatus for recovery is disclosed.
  • Patent Document 4 in a blow-by gas reduction device having an oil separator chamber, a main blow-by gas intake passage having a large opening area for taking blow-by gas into the oil separator chamber and an opening area smaller than that of the main blow-by gas intake passage are disclosed. And the technique of ensuring an oil separator function is provided by providing the sub blow-by gas intake passage which produces
  • blow-by gas that has flowed into a chamber is caused to flow through an oil separation portion while passing through a connecting passage having a small cross-sectional area to increase the flow velocity, thereby generating a vortex flow of blow-by gas in the oil separation portion.
  • an apparatus for separating oil is disclosed.
  • a method of preventing leakage of oil mist by providing a porous sponge or a fiber material through which only air passes in the path to the breather plug can be considered, but in this case, a member such as a sponge or fiber material is used. Not only is it necessary extra, but clogging of sponges and fiber materials with oil is a problem.
  • the present invention has been made in consideration of such circumstances, and in a breather plug that opens the inside of the housing to the atmosphere, it is easy to prevent oil mist generated inside the housing from flowing out through the breather plug.
  • the purpose is to suppress by configuration.
  • the present invention is directed to a breather plug that is attached to a casing and opens the inside of the casing to the atmosphere.
  • the breather plug includes a housing formed with a fluid passage in which one end communicates with the inside of the housing and the other end is opened to the atmosphere.
  • the step between the two has a reverse taper shape whose diameter increases from the inside of the housing toward the atmosphere.
  • the breather plug of the present invention is used in a state in which one end of the fluid passage (end of the large-diameter portion inside the casing) is on the lower side and the other end (end on the air release side) is on the upper side.
  • a valve seat provided inside a fluid passage and a valve body (for example, a check ball) disposed so as to be seated on the valve seat from the atmosphere side, the valve
  • the fluid passage inside the housing with respect to the seat is a stepped fluid passage having a large diameter portion and a small diameter portion, and a step between the large diameter portion and the small diameter portion of the stepped fluid passage.
  • a configuration in which the portion is processed into a reverse taper shape whose diameter increases from the inside of the housing toward the atmosphere side can be given.
  • a configuration in which a spiral groove extending spirally in the axial direction can be formed on the inner peripheral surface of the fluid passage.
  • a spiral groove for example, an internal thread
  • the spiral groove is formed in this way, when the air inside the housing flows into the small diameter portion from the large diameter portion of the fluid passage when the atmosphere is released, the spiral groove on the inner peripheral surface of the small diameter portion turns. A flow is generated.
  • the oil mist in the air is blown off toward the inner peripheral surface of the small-diameter portion by this swirling flow, becomes liquid after adhering to the inner peripheral surface, and then travels along the inner peripheral surface (spiral groove) of the small-diameter portion. Fall down. Therefore, even if the oil mist enters the small diameter portion from the large diameter portion of the fluid passage, the oil mist can be separated at the small diameter portion, so that leakage of the oil mist to the outside of the housing is more effectively suppressed. be able to.
  • the end of the fluid passage inside the casing (the end of the large-diameter portion inside the casing) is tapered.
  • the end of the fluid passage may have a tapered shape whose diameter decreases as it goes from the inside of the housing toward the atmosphere, or the diameter of the end of the fluid passage increases as it goes from the inside of the housing to the atmosphere. It is good also as a reverse taper shape. If the end of the fluid passage inside the housing is tapered like this, the air flow is disturbed near the end of the fluid passage, so that oil mist flowing into the fluid passage can be reduced.
  • the breather plug of the present invention can be applied to a power transmission device (transmission, etc.) of a normal vehicle (conventional vehicle) equipped with only an engine as a driving force source in addition to the power transmission device of a hybrid vehicle. Further, the breather plug of the present invention can be applied to a housing of a differential mechanism mounted on a vehicle, for example, and can also be applied to various devices and various tanks in which oil is stored inside the housing. .
  • breather plug of the present invention oil mist generated inside the housing can be prevented from leaking outside through the breather plug with a simple configuration.
  • FIG. 2 is an XX end view of FIG. 1. It is a Y arrow line view of FIG. It is operation
  • FIG. 1 is a longitudinal sectional view showing an example of a breather plug of the present invention.
  • FIG. 2 is an end view taken along the line XX of FIG. 3 is a view taken in the direction of arrow Y in FIG.
  • the breather plug 1 of this example is attached to a casing 100 of a power transmission device mounted on a hybrid vehicle, and opens to the atmosphere inside the casing 100 and prevents air from entering into the casing 100.
  • the housing 2, the check ball 3, and the cap 4 are provided.
  • the housing 2 includes an upper housing 21, a valve housing 22, and a lower housing 23.
  • the upper housing 21 is a cylindrical member (for example, a resin member).
  • An upper fluid passage 211 is formed in the upper housing 21.
  • the upper fluid passage 211 is a circular passage having a circular cross section extending along the central axis of the upper housing 21, and penetrates the upper housing 21.
  • a communication passage 212 extending in the lateral direction communicates with an upper end portion (end portion on the atmosphere side) of the upper fluid passage 211, and the upper fluid passage 211 is opened to the atmosphere through the communication passage 212.
  • a lower end portion (an end portion on the casing 100 side) of the upper fluid passage 211 is a tapered tapered surface 211a whose diameter gradually increases toward the inside of the casing 100, and a check ball described later is provided on the tapered tapered surface 211a. When 3 contacts (seats), the upper fluid passage 211 is closed.
  • the valve housing 22 is a cylindrical member (for example, a resin member) in which a circular flange 22a is integrally formed at an upper portion.
  • a valve portion fluid passage 221 having a circular cross section is formed in the valve housing 22.
  • the valve housing 22 has a recess 22 b formed above the valve fluid passage 221.
  • the upper housing 21 is fitted into the recess 22b by press-fitting or the like, and the upper fluid passage 211 of the upper housing 21 communicates with a large-diameter portion 221a described later.
  • the valve fluid passage 221 is a stepped fluid passage having a large-diameter portion 221a on the atmosphere side and a small-diameter portion 221b on the inside of the housing 100.
  • the valve portion fluid passage 221 extends along the central axis of the valve housing 22.
  • a corner portion of the step portion 221c between the large diameter portion 221a and the small diameter portion 221b of the valve portion fluid passage 221 serves as a valve seat 222.
  • a check ball (for example, made of resin) 3 is accommodated in the large-diameter portion 221a of the valve portion fluid passage 221, and the valve portion fluid passage 221 is blocked while the check ball 3 is seated on the valve seat 222 by its own weight. Can be removed.
  • the specific gravity of the check ball 3 is smaller than the specific gravity of the oil (such as hydraulic oil) accommodated in the housing 100, and when oil enters the inside of the valve portion fluid passage 221, the check ball 3 is placed on the oil surface. 3 can float.
  • a slit groove 222a extending in the vertical direction (direction parallel to the central axis) is formed on the outer peripheral portion of the circular flange 22a of the valve housing 22.
  • the slit groove 222a is provided at a plurality of locations (for example, 12 locations) on the outer peripheral portion of the circular flange 22a.
  • a slit groove 223 for air flow is formed in the valve seat 222 (step portion 221c) of the valve housing 22, and the check ball 3 is seated on the valve seat 222 in the state where the check ball 3 is seated inside the casing 100.
  • the atmospheric pressure is lower than atmospheric pressure, a small amount of outside air (air) can flow into the housing 100 through the slit groove 223.
  • the slit groove 223 for air circulation has a groove width as small as possible from the viewpoint of preventing foreign matter from entering the inside of the housing 100, but the pressure inside the housing 100 is lower than the atmospheric pressure. Then, the groove width of the slit groove 223 is determined in consideration of the point that the inside of the housing 100 returns to the atmosphere in a short time and the manufacturing requirements.
  • the lower housing 23 is a member (for example, a metal member) in which a flange (for example, a hexagonal flange) 23b is integrally formed on an upper portion of a cylindrical mounting portion 23a.
  • a lower fluid passage 231 having a circular cross section is formed in the lower housing 23.
  • a male screw 23 c is formed on the outer peripheral surface of the mounting portion 23 a of the lower housing 23.
  • the lower fluid passage 231 is a stepped fluid passage having a large-diameter portion 231a inside the housing 100 and a small-diameter portion 231b located on the atmosphere side of the large-diameter portion 231a.
  • the lower fluid passage 231 extends along the central axis of the lower housing 23 and passes through the lower housing 23.
  • the inner diameter of the small-diameter portion 231b on the atmosphere side of the lower fluid passage 231 is equal to the inner diameter of the small-diameter portion 221b on the inside of the housing 100 of the valve housing 22 described above.
  • the step portion 231c between the large diameter portion 231a and the small diameter portion 231b of the lower fluid passage 231 gradually increases in diameter from the inside of the housing 100 toward the atmosphere side (valve housing 22 side). It has a reverse cone taper shape (reverse cone taper surface).
  • This configuration inverted tapered step 231c) is a feature of the present invention.
  • the lower housing 23 and the valve housing 22 described above are integrally formed by insert molding or the like, and a small-diameter portion 231b on the atmosphere side of the lower housing 23 and a small-diameter portion 221b on the inside of the housing 100 of the valve housing 22 Are communicating. Further, as described above, the valve part fluid passage 221 and the upper fluid passage 211 communicate with each other. Therefore, the lower fluid passage 231, the valve part fluid passage 221, and the upper fluid passage 211 (communication passage) are provided in the housing 2. 212 (including 212) is formed.
  • the cap 4 is a substantially cylindrical member that is open only at the bottom, and is arranged so as to cover the circular flange 22a of the upper housing 21 and the valve housing 22.
  • the cap 4 is provided with a locking claw 4a at the lower inner surface, and the locking claw 4a is locked to the circular flange 22a of the valve housing 22 to prevent the cap 4 from falling off the housing 1. Yes.
  • a gap C is provided between the inner peripheral surface of the cap 4 and the outer peripheral surface of the circular flange 22a. Furthermore, since a plurality of slit grooves 222a are formed on the outer peripheral portion of the circular flange 22a, the inside of the cap 4 is opened to the atmosphere by the gaps C and the slit grooves 222a. As a result, the upper end (communication passage 212) of the upper fluid passage 211 is opened to the atmosphere.
  • the breather plug 1 described above is configured such that the male screw 23c of the lower housing 23 is screwed into the boss hole (female screw hole) 101 of the housing 100 with the upper housing 21 as the upper side and the lower housing 23 as the lower side. Attached to. In this attached state, the lower end of the lower fluid passage 231 (the lower end of the large diameter portion 231a) communicates with the inside of the housing 100, and the upper end of the upper fluid passage 211 (the communication passage 212) is opened to the atmosphere.
  • the air inside the casing 100 flows into the large diameter portion 231a of the lower fluid passage 231, but a part thereof, that is, the air rising along the inner peripheral surface 231af of the large diameter portion 231a, As shown in FIG. 5, since it is returned to the inside of the housing 100 by the stepped portion 231c having an inverted conical taper shape between the large diameter portion 231a and the small diameter portion 231b, the air flow is disturbed, and the step portion 231c Air flow stagnation occurs in the vicinity. When the stagnation of the air flow occurs, the oil mist floating in the air falls. That is, the oil mist floating in the air rises in the large-diameter portion 231a of the lower fluid passage 231 along the air flow, but when the air flow stays, the rising energy disappears and falls by its own weight. To do.
  • the check ball 3 is separated from the valve seat 222 during traveling at a high altitude where the atmospheric pressure is low, and the pressure inside the housing 100 is lowered. Even when the air pressure inside the housing 100 becomes low after sitting on the seat 222, when returning to the flat ground, air (outside air) is passed through the slit groove 223 for air circulation formed in the valve seat 222 of the check ball 3. Since the air flows into the body 100, the state where the pressure inside the housing 100 is lower than the atmospheric pressure is not continued for a long time.
  • the oil contained in the housing 100 may rise to the breather plug 1 due to factors such as the inclination of the housing 100, for example. Even if the oil rises in this way, as shown in FIG. 6, the upper fluid passage 211 is blocked when the check ball 3 floating on the oil surface comes into contact with the conical tapered surface 211a at the lower end of the upper fluid passage 211. Since it peels off, it can prevent that oil leaks outside.
  • the dimension of the step portion 231c between the large diameter portion 231a and the small diameter portion 231b of the lower fluid passage 231 is not particularly limited, but a value (inner diameter difference / taper angle) at which the above-described air flow is likely to stay in the vicinity of the step portion 231c may be acquired and set by experiments and calculations. Good.
  • FIG. 7 is a longitudinal sectional view showing another example of the breather plug of the present invention.
  • the breather plug 1A of this example is axially formed on the inner peripheral surface 231bf of the small diameter portion 231b (inner diameter: about 3 mm, for example) of the lower fluid passage 231 and the inner peripheral surface 221bf of the small diameter portion 221b of the valve portion fluid passage 221.
  • a feature is that a spiral groove (specifically, an internal thread) 232 extending spirally is formed.
  • Other configurations are the same as those in [Embodiment 1].
  • the spiral groove 232 is formed.
  • the oil mist in the air is blown off toward the inner peripheral surfaces 231bf and 221bf of the small-diameter portions 231b and 221b by this swirl flow, adheres to the inner peripheral surfaces 231bf and 221bf and becomes liquid, and then the small-diameter portions 231b and 221b.
  • the inner peripheral surfaces 231bf and 221bf salivas to the inner peripheral surfaces 231bf and 221bf (spiral groove 232) of the first and second surfaces.
  • the small diameter portion 231b small diameter
  • the oil mist can be separated from the air in the portion 221b), so that leakage of the oil mist to the outside of the housing 100 can be more effectively suppressed.
  • the spiral groove may have a form other than the internal thread. Further, the spiral groove may be formed only on the inner peripheral surface 231bf of the small diameter portion 231b of the lower fluid passage 231.
  • a spiral groove may be formed on the inner peripheral surface of the large diameter portion 231 a of the lower fluid passage 231.
  • FIG. 8 is a longitudinal sectional view showing another example of the breather plug of the present invention.
  • the lower end portion 231d (end portion inside the casing 100) of the large diameter portion 231a of the lower fluid passage 231 is moved from the inside of the casing 100 toward the atmosphere side (small diameter portion 231b side). It is characterized by a conical taper shape (conical taper surface) whose diameter gradually decreases. Other configurations are the same as those in [Embodiment 1].
  • the breather plug 1B of this example as shown in FIG. 8, the air flow is disturbed near the end of the large-diameter portion 231a of the lower fluid passage 231 on the inside of the casing 100, and a part of the air flow is generated. Since it stays, the oil mist flowing into the lower fluid passage 231 can be reduced.
  • the lower end of the large-diameter portion 231a (the end on the inside of the housing 100) has a tapered shape opposite to that in FIG. 8, that is, the diameter increases from the inside of the housing 100 toward the atmosphere (the small-diameter portion 231b side). May be formed in an inverted conical taper shape (inverted conical taper surface) that gradually increases.
  • a spiral groove 232 (internal thread) may be formed.
  • the shape of the step portion 231c between the large diameter portion 231a and the small diameter portion 231b of the lower fluid passage 231 is, for example, a conical concave shape as shown in FIG. May be.
  • valve body provided in the fluid passage of the housing is a check ball.
  • present invention is not limited to this, and the present invention can be applied to breather plugs using valve bodies of other shapes.
  • the present invention is applied to the breather plug in which the check ball (valve element) is provided in the fluid passage of the housing is shown, but the present invention is not limited to this, and the check ball (valve element) It can also be applied to an open air breather plug that does not include
  • the present invention is not limited thereto.
  • the present invention can also be applied to a breather plug attached to a housing of a power transmission device (such as a transmission) of a conventional vehicle.
  • the present invention can be applied to a breather plug attached to a housing of a differential mechanism mounted on a vehicle, for example.
  • the present invention is also applicable to breather plugs that are used in various devices and various tanks in which oil is stored in the housing.
  • the present invention can be used for various devices including a power transmission device mounted on a vehicle and a breather plug that opens the inside of various tanks to the atmosphere.

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  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
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Abstract

A breather plug mounted to a case and releasing the inside of the case to the atmosphere is provided with a housing having a fluid path. When the breather plug is being mounted to the case, one end of the fluid path communicates with the inside of the case and the other end is open to the atmosphere. The fluid path of the housing is provided with a large-diameter section communicating with the inside of the case and a small-diameter section located on the atmosphere side of the large-diameter section and connecting to the large-diameter section with a step located in between. The step between the large-diameter section and the small-diameter section is formed in a reversely tapered shape in which the diameter increases from the inside of the case to the atmosphere side. Such a step having the reversely tapered shape in the fluid path produces turbulence in airflow in the fluid path, producing stagnation of the airflow in the periphery of the step to cause oil mist to drop by the weight of the oil mist. As a result, leakage of the oil mist to the outside is suppressed.

Description

ブリーザプラグBreather plug
　本発明は、例えば、車両に搭載される動力伝達装置のなどの筐体に取り付けられ、筐体内部を大気に開放するブリーザプラグに関する。 The present invention relates to a breather plug that is attached to a housing such as a power transmission device mounted on a vehicle and opens the inside of the housing to the atmosphere.
　エンジン等の駆動力源を搭載した車両には、駆動力源で発生した駆動力を駆動輪に伝達する動力伝達装置（トランスアスクル）を備えている。動力伝達装置の筐体（ケース）には、当該筐体内部の圧力を調整するためにブリーザプラグが設けられている（例えば、特許文献１参照）。 A vehicle equipped with a driving force source such as an engine is equipped with a power transmission device (trans-askul) that transmits the driving force generated by the driving force source to driving wheels. The casing (case) of the power transmission device is provided with a breather plug in order to adjust the pressure inside the casing (see, for example, Patent Document 1).
　ブリーザプラグの一例を図１１に示す。この例のブリーザプラグ３０１は、密閉型のブリーザプラグであって、通気孔３２１が中央部に形成され、上部に弁座３２２が形成されたプラグ本体３０２と、弁座３２２の上方に配置された弁体３０３と、プラグ本体３０２の上部を覆うように配置されたキャップ３０４と、キャップ３０４内に収容され、弁体３０３を弁座３２２に向けて付勢する圧縮コイルばね３０５とを備え、プラグ本体３０２の取付部３０２ａを筐体のボス孔（図示せず）にねじ込むことによって筐体に取り付けられる。 An example of a breather plug is shown in FIG. The breather plug 301 of this example is a hermetic type breather plug, and is disposed above the valve seat 322, a plug main body 302 having a vent hole 321 formed at the center and a valve seat 322 formed at the upper portion. The valve body 303, a cap 304 disposed so as to cover the upper portion of the plug body 302, and a compression coil spring 305 housed in the cap 304 and biasing the valve body 303 toward the valve seat 322, The mounting portion 302a of the main body 302 is attached to the housing by screwing it into a boss hole (not shown) of the housing.
　このような構造のブリーザプラグ３０１では、通常時（筐体内の圧力が上昇していないとき）は、図１１（Ａ）に示すように、圧縮コイルばね３０５の弾性力によって弁体３０３が弁座３２２に着座しており、外部から筐体内部への異物の混入を防止している。一方、筐体内の圧力が上昇し、弁体３０３に作用する力が圧縮コイルばね３０５の弾性力よりも大きくなったときには、図１１（Ｂ）に示すように、弁体３０３が弁座３２２から離座して、筐体内部が大気に開放される構造となっている。 In the breather plug 301 having such a structure, in a normal state (when the pressure in the housing is not increased), as shown in FIG. It is seated on 322 and prevents foreign matter from entering the housing from the outside. On the other hand, when the pressure in the housing rises and the force acting on the valve body 303 becomes larger than the elastic force of the compression coil spring 305, the valve body 303 is removed from the valve seat 322 as shown in FIG. It has a structure in which it is separated and the inside of the housing is opened to the atmosphere.
　ところで、ハイブリッド車両の動力伝達装置は電動機を内蔵している。このような動力伝達装置では、筐体内部の気圧が下がると絶縁抵抗が降下して漏電が発生する可能性がある。このため、筐体内部の気圧を検出し、その検出した気圧が低いときには電動機の昇圧電圧を下げる等、筐体内の気圧に応じた電圧制御を行っている。 By the way, the power transmission device of the hybrid vehicle has a built-in electric motor. In such a power transmission device, when the atmospheric pressure inside the housing is lowered, the insulation resistance may drop, and electric leakage may occur. For this reason, the atmospheric pressure inside the housing is detected, and when the detected atmospheric pressure is low, voltage control is performed according to the atmospheric pressure inside the housing, such as lowering the boosted voltage of the motor.
　こうした動力伝達装置に、図１１に示す密閉型のブリーザプラグを用いた場合、例えば、気圧の低い高地の走行中において弁体３２２が開いて筐体内部の気圧が低下し、その後に弁体３２２が閉じると、筐体内部の気圧が低い状態に保持されてしまう。そして、そのような状態で平地走行に戻った際に、筐体内部の気圧が平地の大気圧に戻るのに多くの時間がかかる。 When the hermetic breather plug shown in FIG. 11 is used for such a power transmission device, for example, the valve body 322 is opened during traveling at a high altitude where the atmospheric pressure is low, and the atmospheric pressure inside the housing is lowered. When is closed, the pressure inside the housing is kept low. And when it returns to a flat ground driving | running | working in such a state, it takes much time for the atmospheric pressure inside a housing | casing to return to the atmospheric pressure of a flat ground.
　この点について説明すると、図１１に示すブリーザプラグ３０１では、閉弁状態のときには圧縮コイルばね３０５の弾性力によって弁体３０３が弁座３２２に強制的に押し付けられているので、筐体内部の気圧が、筐体外部の気圧よりも高くて圧縮コイルばね３０５の弾性力に打ち勝つ大きさの気圧でないと開弁状態にはならない。このため、筐体内部の気圧が大気圧よりも低いときには、筐体内部の気圧上昇は、筐体のシール部等からの空気の侵入による気圧上昇だけであり、筐体内部が大気圧に戻るのに多くの時間を要する。こうした状況になると、電動機の昇圧電圧が低い状態が継続されるので、電動機の性能を十分に活用できない場合がある。 To explain this point, in the breather plug 301 shown in FIG. 11, when the valve is closed, the valve body 303 is forcibly pressed against the valve seat 322 by the elastic force of the compression coil spring 305. However, the valve cannot be opened unless the pressure is higher than the pressure outside the casing and is large enough to overcome the elastic force of the compression coil spring 305. For this reason, when the atmospheric pressure inside the housing is lower than the atmospheric pressure, the atmospheric pressure inside the housing is only increased due to the intrusion of air from the sealing portion of the housing, and the inside of the housing returns to the atmospheric pressure. It takes a lot of time. In such a situation, since the state where the boosted voltage of the electric motor is low continues, the performance of the electric motor may not be fully utilized.
　このような点を解消するには大気開放型のブリーザプラグを採用すればよい。大気開放型のブリーザプラグは、例えば、一端が筐体の内部に連通し、他端が大気に開放される流体通路が形成されたハウジングと、流体通路の内部に設けられた弁座と、この弁座の大気側に設けられ、当該弁座に着座した状態で流体通路を閉鎖するチェックボール（弁体）とを備え、筐体内部の気圧が上昇したときに、チェックボールが弁座から浮き上がり、そのチェックボールと通路内面との間の隙間を通じて筐体内部が大気に開放される構造となっている（例えば、特許文献２参照）。なお、大気開放型のブリーザプラグでは、筐体内部が流体通路を通じて常に大気に開放されていると、外部から筐体内部に異物が混入しやすくなるので、その異物混入を抑制するために、流体通路内にチェックボールを配設している。 ¡To solve this problem, an open air breather plug may be used. An air-release type breather plug includes, for example, a housing in which one end communicates with the inside of the housing and the other end is open to the atmosphere, a valve seat provided in the fluid passage, A check ball (valve body) is provided on the atmosphere side of the valve seat and closes the fluid passage while seated on the valve seat. When the pressure inside the housing rises, the check ball rises from the valve seat The inside of the housing is open to the atmosphere through a gap between the check ball and the inner surface of the passage (see, for example, Patent Document 2). In addition, in an air-release type breather plug, if the inside of the housing is always open to the atmosphere through the fluid passage, foreign matter is likely to enter the inside of the housing from the outside. A check ball is disposed in the passage.
　このような大気開放型ブリーザプラグでは、チェックボールが弁座に強制的に押し付けられていないため、車両発進・停止や走行中の振動等によってチェックボールが動いて、筐体内部の大気への開放と流体通路の閉鎖（筐体内部の呼吸）がしばしば行われるので、筐体内部の気圧が大気圧よりも低い状態が長く継続されることはない。なお、大気開放型ブリーザプラグには、例えば、チェックボールが着座する弁座に空気流通用のスリット溝が形成されているものがあり、この場合も、筐体内部の気圧が大気圧よりも低い状態が長く継続されることはない。 In such an open air breather plug, the check ball is not forcedly pressed against the valve seat, so the check ball moves due to vehicle start / stop, vibration during driving, etc. Since the fluid passage is often closed (breathing inside the housing), the state where the air pressure inside the housing is lower than the atmospheric pressure is not continued for a long time. There are air release type breather plugs in which, for example, a slit groove for air circulation is formed in a valve seat on which a check ball is seated. The state will not last long.
　なお、ガス中に含まれる油分（オイルミスト）を分離する技術として下記の特許文献３～５に記載の技術がある。 In addition, there are techniques described in Patent Documents 3 to 5 below as techniques for separating the oil (oil mist) contained in the gas.
　特許文献３には、ガス流入管とガス流出管とを備えた筒状の容器内に螺旋部材を設け、前記容器内でガスの旋回流を発生させ、その旋回流によってガス中の油分を分離回収する装置が開示されている。 In Patent Document 3, a spiral member is provided in a cylindrical container having a gas inflow pipe and a gas outflow pipe, and a swirling flow of gas is generated in the container, and oil content in the gas is separated by the swirling flow. An apparatus for recovery is disclosed.
　特許文献４には、オイルセパレータ室を備えたブローバイガス還元装置において、オイルセパレータ室にブローバイガスを取り入れる大開口面積のメインブローバイガス取入通路と、メインブローバイガス取入通路よりも開口面積が小で、かつメインブローバイガス流に対して乱流を生成するサブブローバイガス取入通路とを設けることで、オイルセパレータ機能を確保する技術が開示されている。 In Patent Document 4, in a blow-by gas reduction device having an oil separator chamber, a main blow-by gas intake passage having a large opening area for taking blow-by gas into the oil separator chamber and an opening area smaller than that of the main blow-by gas intake passage are disclosed. And the technique of ensuring an oil separator function is provided by providing the sub blow-by gas intake passage which produces | generates a turbulent flow with respect to a main blow-by gas flow.
　特許文献５には、チャンバに流入したブローバイガスを、断面積の小さい連結通路を通過させて流速を速くした状態でオイル分離部に流入させることにより、当該オイル分離部内でブローバイガスの渦流を発生させてオイルを分離する装置が開示されている。
特開平０８－２８５０５３号公報 特開２００８－１０６７９２号公報 特開平０７－２４７８２０号公報 特開平０５－１７１９１６号公報 特開２００３－１２０２４８号公報 In Patent Document 5, blow-by gas that has flowed into a chamber is caused to flow through an oil separation portion while passing through a connecting passage having a small cross-sectional area to increase the flow velocity, thereby generating a vortex flow of blow-by gas in the oil separation portion. And an apparatus for separating oil is disclosed.
Japanese Patent Laid-Open No. 08-285053 JP 2008-106792 A Japanese Patent Application Laid-Open No. 07-247820 Japanese Patent Laid-Open No. 05-171916 JP 2003-120248 A
　ところで、動力伝達装置においては、内部に収容されたオイル（作動油等）のギヤによる攪拌等によって筐体内部にオイルミストが発生する。ここで、動力伝達装置の筐体に設けるブリーザプラグが上記した大気開放型のブリーザプラグである場合、筐体内部で発生したオイルミストがブリーザプラグの流体通路を通過して外部に漏出し、ブリーザプラグの周辺の筐体などに付着することがある。 By the way, in the power transmission device, oil mist is generated inside the casing due to agitation or the like of the oil (operating oil or the like) accommodated in the power transmission device. Here, when the breather plug provided in the casing of the power transmission device is the above-described air release type breather plug, oil mist generated inside the casing leaks outside through the fluid passage of the breather plug, and the breather It may adhere to the housing around the plug.
　なお、上記した特許文献３～５に開示されているようなオイル分離技術を動力伝達装置に適用すれば、装置外部へのオイルミストの漏出を軽減することは可能であるが、この場合、装置の大型化・重量増加・コスト増加が課題となる。 If the oil separation technology disclosed in Patent Documents 3 to 5 described above is applied to the power transmission device, it is possible to reduce leakage of oil mist to the outside of the device. Increases in size, weight, and cost are issues.
　また、ブリーザプラグへの経路に、多孔質のスポンジや、空気のみを通す繊維素材を設けることで、オイルミストの漏出を防止する方法も考えられるが、この場合、スポンジや繊維素材等の部材が余分に必要なるばかりでなく、スポンジや繊維素材の油分による詰りが問題になる。 In addition, a method of preventing leakage of oil mist by providing a porous sponge or a fiber material through which only air passes in the path to the breather plug can be considered, but in this case, a member such as a sponge or fiber material is used. Not only is it necessary extra, but clogging of sponges and fiber materials with oil is a problem.
　本発明はそのような実情を考慮してなされたもので、筐体内部を大気に開放するブリーザプラグにおいて、筐体内部で発生したオイルミストが当該ブリーザプラグを通じて外部に流出することを、簡単な構成で抑制することを目的とする。 The present invention has been made in consideration of such circumstances, and in a breather plug that opens the inside of the housing to the atmosphere, it is easy to prevent oil mist generated inside the housing from flowing out through the breather plug. The purpose is to suppress by configuration.
　本発明は、筐体に取り付けられ、前記筐体の内部を大気に開放するブリーザプラグを対象としている。このようなブリーザプラグにおいて、前記筐体に取り付けた状態で、一端が前記筐体の内部に連通し、他端が大気に開放される流体通路が形成されたハウジングを備え、前記ハウジングの流体通路は、前記筐体内部に連通する大径部と、前記大径部の大気側に位置し、当該大径部に段部を介して連なる小径部とを有し、前記大径部と小径部との間の段部が、前記筐体内部側から大気側に向かうに従って径が拡大する逆テーパ形状となっていることを技術的特徴としている。 The present invention is directed to a breather plug that is attached to a casing and opens the inside of the casing to the atmosphere. In such a breather plug, the breather plug includes a housing formed with a fluid passage in which one end communicates with the inside of the housing and the other end is opened to the atmosphere. Has a large-diameter portion communicating with the inside of the housing, and a small-diameter portion located on the atmosphere side of the large-diameter portion and connected to the large-diameter portion via a step portion, and the large-diameter portion and the small-diameter portion The technical feature is that the step between the two has a reverse taper shape whose diameter increases from the inside of the housing toward the atmosphere.
　本発明のブリーザプラグは、流体通路の一端（大径部の筐体内部側の端部）を下側とし、他端（大気開放側端部）を上側として筐体に取り付けた状態で使用される。 The breather plug of the present invention is used in a state in which one end of the fluid passage (end of the large-diameter portion inside the casing) is on the lower side and the other end (end on the air release side) is on the upper side. The
　ブリーザプラグを筐体に取り付けた使用状態で、筐体内部の気圧が上昇したときには、筐体内部の空気がブリーザプラグの流体通路を通じて外部に放出され、筐体内部の気圧が大気圧に保持される。この大気開放時において、筐体内部から流体通路の大径部に流入した空気の一部（大径部の内周面に沿って上昇する空気）は、大径部と小径部との間の逆テーパ形状の段部によって筐体内部側に戻されるので、空気流れに乱れが生じて、段部の周辺において空気流れの滞留が発生する。空気流れの滞留が発生すると、空気中に浮遊するオイルミストが落下する。すなわち、空気中に浮遊するオイルミストは、空気の流れにのって流体通路内を上昇するが、その空気流れに滞留が生じると、上昇エネルギがなくなって自重によって落下する。 When the air pressure inside the housing rises while the breather plug is attached to the housing, the air inside the housing is released to the outside through the fluid passage of the breather plug, and the air pressure inside the housing is maintained at atmospheric pressure. The At the time of opening to the atmosphere, a part of the air flowing into the large diameter part of the fluid passage from the inside of the casing (air rising along the inner peripheral surface of the large diameter part) is between the large diameter part and the small diameter part. Since it is returned to the inside of the housing by the step portion having the reverse taper shape, the air flow is disturbed, and the air flow stays around the step portion. When the stagnation of the air flow occurs, the oil mist floating in the air falls. That is, the oil mist floating in the air rises in the fluid passage along the air flow, but when the air flow stays, the rising energy disappears and falls by its own weight.
　これによって、大径部から小径部側に向かうオイルミストを抑制することができ、オイルミストの外部への漏出を抑制することができる。しかも、そのような効果を、オイルミスト分離のための新たな部材などを用いることなく、流体通路の大径部と小径部との間の段部を逆テーパ形状にする、という簡単かつ安価な構成のもとに達成することができる。 This makes it possible to suppress oil mist from the large diameter portion toward the small diameter portion, and to suppress leakage of the oil mist to the outside. Moreover, such an effect is simple and inexpensive in that the step portion between the large-diameter portion and the small-diameter portion of the fluid passage is formed in a reverse taper shape without using a new member for oil mist separation. Can be achieved under construction.
　本発明の具体的な構成として、流体通路の内部に設けられた弁座と、その弁座に大気側から着座するように配設された弁体（例えば、チェックボール）とを備え、前記弁座に対して筐体内部側の流体通路が、大径部と小径部とを有する段付きの流体通路となっており、その段付きの流体通路の大径部と小径部との間の段部が、筐体内部側から大気側に向かうに従って径が拡大する逆テーパ形状に加工されているという構成を挙げることができる。 As a specific configuration of the present invention, a valve seat provided inside a fluid passage and a valve body (for example, a check ball) disposed so as to be seated on the valve seat from the atmosphere side, the valve The fluid passage inside the housing with respect to the seat is a stepped fluid passage having a large diameter portion and a small diameter portion, and a step between the large diameter portion and the small diameter portion of the stepped fluid passage. A configuration in which the portion is processed into a reverse taper shape whose diameter increases from the inside of the housing toward the atmosphere side can be given.
　他の具体的な構成として、流体通路の内周面に、軸方向に螺旋状に延びる螺旋状の溝を形成するという構成を挙げることができる。この場合、特に、流体通路の大径部の大気側に位置する小径部の内周面に螺旋状の溝（例えば雌ねじ）を形成しておくことが好ましい。 As another specific configuration, a configuration in which a spiral groove extending spirally in the axial direction can be formed on the inner peripheral surface of the fluid passage. In this case, it is particularly preferable to form a spiral groove (for example, an internal thread) on the inner peripheral surface of the small diameter portion located on the atmosphere side of the large diameter portion of the fluid passage.
　このように螺旋状の溝を形成しておくと、大気開放時に、筐体内部の空気が流体通路の大径部から小径部に流入したときに、小径部内周面の螺旋状の溝によって旋回流が発生する。この旋回流によって空気中のオイルミストが小径部の内周面に向けて吹き飛ばされ、内周面に付着して液状となった後、小径部の内周面（螺旋状の溝）を伝って下方に落下する。従って、オイルミストが流体通路の大径部から小径部に浸入しても、当該小径部においてオイルミストを分離することができるので、筐体外部へのオイルミストの漏出をより効果的に抑制することができる。 If the spiral groove is formed in this way, when the air inside the housing flows into the small diameter portion from the large diameter portion of the fluid passage when the atmosphere is released, the spiral groove on the inner peripheral surface of the small diameter portion turns. A flow is generated. The oil mist in the air is blown off toward the inner peripheral surface of the small-diameter portion by this swirling flow, becomes liquid after adhering to the inner peripheral surface, and then travels along the inner peripheral surface (spiral groove) of the small-diameter portion. Fall down. Therefore, even if the oil mist enters the small diameter portion from the large diameter portion of the fluid passage, the oil mist can be separated at the small diameter portion, so that leakage of the oil mist to the outside of the housing is more effectively suppressed. be able to.
　他の具体的な構成として、前記流体通路の筐体内部側の端部（大径部の筐体内部側の端部）をテーパ形状にするという構成を挙げることができる。この場合、流体通路の端部を筐体内部側から大気側に向かうに従って径が縮小するテーパ形状としてもよいし、流体通路の端部を筐体内部側から大気側に向かうに従って径が拡大する逆テーパ形状としてもよい。このように流体通路の筐体内部側の端部をテーパ形状としておくと、流体通路の端部付近で空気流れが乱れるので、流体通路内に流入するオイルミストを低減することができる。 As another specific configuration, there can be mentioned a configuration in which the end of the fluid passage inside the casing (the end of the large-diameter portion inside the casing) is tapered. In this case, the end of the fluid passage may have a tapered shape whose diameter decreases as it goes from the inside of the housing toward the atmosphere, or the diameter of the end of the fluid passage increases as it goes from the inside of the housing to the atmosphere. It is good also as a reverse taper shape. If the end of the fluid passage inside the housing is tapered like this, the air flow is disturbed near the end of the fluid passage, so that oil mist flowing into the fluid passage can be reduced.
　なお、本発明のブリーザプラグは、ハイブリッド車両の動力伝達装置のほか、駆動力源としてエンジンのみを搭載した通常車（コンベショナル車）の動力伝達装置（変速機等）にも適用可能である。また、本発明のブリーザプラグは、例えば車両に搭載されるデファレンシャル機構の筐体にも適用可能であり、さらに、筐体内部にオイルが収容される各種装置や各種タンクなどにも適用可能である。 The breather plug of the present invention can be applied to a power transmission device (transmission, etc.) of a normal vehicle (conventional vehicle) equipped with only an engine as a driving force source in addition to the power transmission device of a hybrid vehicle. Further, the breather plug of the present invention can be applied to a housing of a differential mechanism mounted on a vehicle, for example, and can also be applied to various devices and various tanks in which oil is stored inside the housing. .
　本発明のブリーザプラグによれば、筐体内部に発生したオイルミストが当該ブリーザプラグを通じて外部に漏出することを、簡単な構成で抑制することができる。 According to the breather plug of the present invention, oil mist generated inside the housing can be prevented from leaking outside through the breather plug with a simple configuration.
本発明のブリーザプラグの一例を示す縦断面図である。It is a longitudinal cross-sectional view which shows an example of the breather plug of this invention. 図１のＸ－Ｘ端面図である。FIG. 2 is an XX end view of FIG. 1. 図１のＹ矢視図である。It is a Y arrow line view of FIG. 図１のブリーザプラグの動作説明図である。It is operation | movement explanatory drawing of the breather plug of FIG. 図４の要部拡大断面図である。It is a principal part expanded sectional view of FIG. 図１のブリーザプラグの動作説明図である。It is operation | movement explanatory drawing of the breather plug of FIG. 本発明のブリーザプラグの他の例を示す縦断面図である。It is a longitudinal cross-sectional view which shows the other example of the breather plug of this invention. 本発明のブリーザプラグの別の例を示す縦断面図である。It is a longitudinal cross-sectional view which shows another example of the breather plug of this invention. 本発明のブリーザプラグの更に別の例を示す縦断面図である。It is a longitudinal cross-sectional view which shows another example of the breather plug of this invention. 本発明のブリーザプラグの流体通路に設ける段部の変形例を示す要部拡大断面図である。It is a principal part expanded sectional view which shows the modification of the step part provided in the fluid passage of the breather plug of this invention. 従来のブリーザプラグの一例を示す縦断面図である。It is a longitudinal cross-sectional view which shows an example of the conventional breather plug.
符号の説明Explanation of symbols
　１　ブリーザプラグ
　２　ハウジング
　２１　上部ハウジング
　２１１　上部流体通路
　２１２　連通路
　２２　バルブハウジング
　２２１　バルブ部流体通路
　２２２　弁座
　２３　下部ハウジング
　２３１　下部流体通路
　２３１ａ　大径部
　２３１ｂ　小径部
　２３１ｃ　段部
　２３２　螺旋状の溝
　３　チェックボール
　４　キャップ DESCRIPTION OF SYMBOLS 1 Breather plug 2 Housing 21 Upper housing 211 Upper fluid passage 212 Communication passage 22 Valve housing 221 Valve portion fluid passage 222 Valve seat 23 Lower housing 231 Lower fluid passage 231a Large diameter portion 231b Small diameter portion 231c Step portion 232 Spiral groove 3 Check Ball 4 cap
　以下、本発明の実施形態を図面に基づいて説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
　［実施形態１］
　図１は本発明のブリーザプラグの一例を示す縦断面図である。図２は図１のＸ－Ｘ端面図である。図３は図１のＹ矢視図である。 [Embodiment 1]
FIG. 1 is a longitudinal sectional view showing an example of a breather plug of the present invention. FIG. 2 is an end view taken along the line XX of FIG. 3 is a view taken in the direction of arrow Y in FIG.
　この例のブリーザプラグ１は、ハイブリッド車両に搭載される動力伝達装置の筐体１００に取り付けられ、筐体１００内部の大気開放及び筐体１００内部への異物の混入防止を行う大気開放型ブリーザプラグであって、ハウジング２、チェックボール３、及び、キャップ４を備えている。 The breather plug 1 of this example is attached to a casing 100 of a power transmission device mounted on a hybrid vehicle, and opens to the atmosphere inside the casing 100 and prevents air from entering into the casing 100. The housing 2, the check ball 3, and the cap 4 are provided.
　ハウジング２は、上部ハウジング２１、バルブハウジング２２、及び、下部ハウジング２３によって構成されている。 The housing 2 includes an upper housing 21, a valve housing 22, and a lower housing 23.
　上部ハウジング２１は円筒形状の部材（例えば樹脂製の部材）である。上部ハウジング２１には上部流体通路２１１が形成されている。上部流体通路２１１は、上部ハウジング２１の中心軸に沿って延びる断面円形の通路であって、当該上部ハウジング２１を貫通している。上部流体通路２１１の上端部（大気側の端部）には、横方向に延びる連通路２１２が連通しており、この連通路２１２を通じて上部流体通路２１１が大気に開放される。上部流体通路２１１の下端部（筐体１００側の端部）は、筐体１００内部側に向かうに従って直径が漸次拡大する円すいテーパ面２１１ａとなっており、この円すいテーパ面２１１ａに後述するチェックボール３が当接（着座）すると、上部流体通路２１１が塞がれる。 The upper housing 21 is a cylindrical member (for example, a resin member). An upper fluid passage 211 is formed in the upper housing 21. The upper fluid passage 211 is a circular passage having a circular cross section extending along the central axis of the upper housing 21, and penetrates the upper housing 21. A communication passage 212 extending in the lateral direction communicates with an upper end portion (end portion on the atmosphere side) of the upper fluid passage 211, and the upper fluid passage 211 is opened to the atmosphere through the communication passage 212. A lower end portion (an end portion on the casing 100 side) of the upper fluid passage 211 is a tapered tapered surface 211a whose diameter gradually increases toward the inside of the casing 100, and a check ball described later is provided on the tapered tapered surface 211a. When 3 contacts (seats), the upper fluid passage 211 is closed.
　バルブハウジング２２は、上部に円形フランジ２２ａが一体形成された円筒形状の部材（例えば樹脂製の部材）である。バルブハウジング２２には断面円形のバルブ部流体通路２２１が形成されている。また、バルブハウジング２２には、バルブ部流体通路２２１の上方に凹部２２ｂが形成されている。この凹部２２ｂには上部ハウジング２１が圧入等によって嵌め込まれており、上部ハウジング２１の上部流体通路２１１と、後述する大径部２２１ａとが連通している。 The valve housing 22 is a cylindrical member (for example, a resin member) in which a circular flange 22a is integrally formed at an upper portion. A valve portion fluid passage 221 having a circular cross section is formed in the valve housing 22. Further, the valve housing 22 has a recess 22 b formed above the valve fluid passage 221. The upper housing 21 is fitted into the recess 22b by press-fitting or the like, and the upper fluid passage 211 of the upper housing 21 communicates with a large-diameter portion 221a described later.
　バルブ部流体通路２２１は、大気側の大径部２２１ａと筐体１００内部側の小径部２２１ｂとを有する段付きの流体通路である。バルブ部流体通路２２１はバルブハウジング２２の中心軸に沿って延びている。このバルブ部流体通路２２１の大径部２２１ａと小径部２２１ｂとの間の段部２２１ｃの角部が弁座２２２となっている。 The valve fluid passage 221 is a stepped fluid passage having a large-diameter portion 221a on the atmosphere side and a small-diameter portion 221b on the inside of the housing 100. The valve portion fluid passage 221 extends along the central axis of the valve housing 22. A corner portion of the step portion 221c between the large diameter portion 221a and the small diameter portion 221b of the valve portion fluid passage 221 serves as a valve seat 222.
　バルブ部流体通路２２１の大径部２２１ａにはチェックボール（例えば樹脂製）３が収容されており、このチェックボール３が自重により弁座２２２に着座している状態でバルブ部流体通路２２１が塞がれる。なお、チェックボール３の比重は、筐体１００内部に収容されるオイル（作動油等）の比重よりも小さくて、オイルがバルブ部流体通路２２１の内部に浸入したときには、その油面にチェックボール３が浮かぶことができる。 A check ball (for example, made of resin) 3 is accommodated in the large-diameter portion 221a of the valve portion fluid passage 221, and the valve portion fluid passage 221 is blocked while the check ball 3 is seated on the valve seat 222 by its own weight. Can be removed. The specific gravity of the check ball 3 is smaller than the specific gravity of the oil (such as hydraulic oil) accommodated in the housing 100, and when oil enters the inside of the valve portion fluid passage 221, the check ball 3 is placed on the oil surface. 3 can float.
　バルブハウジング２２の円形フランジ２２ａの外周部には、上下方向（中心軸と平行な方向）に延びるスリット溝２２２ａが形成されている。このスリット溝２２２ａは円形フランジ２２ａの外周部の複数箇所（例えば１２箇所）に設けられている。 A slit groove 222a extending in the vertical direction (direction parallel to the central axis) is formed on the outer peripheral portion of the circular flange 22a of the valve housing 22. The slit groove 222a is provided at a plurality of locations (for example, 12 locations) on the outer peripheral portion of the circular flange 22a.
　また、バルブハウジング２２の弁座２２２（段部２２１ｃ）には、空気流通用のスリット溝２２３が形成されており、チェックボール３が弁座２２２に着座している状態で、筐体１００内部の気圧が大気圧よりも低いときに、少量の外気（空気）がスリット溝２２３を通じて筐体１００内部に流入できるようになっている。 Further, a slit groove 223 for air flow is formed in the valve seat 222 (step portion 221c) of the valve housing 22, and the check ball 3 is seated on the valve seat 222 in the state where the check ball 3 is seated inside the casing 100. When the atmospheric pressure is lower than atmospheric pressure, a small amount of outside air (air) can flow into the housing 100 through the slit groove 223.
　なお、空気流通用のスリット溝２２３は、筐体１００内部への異物混入を防止する観点から溝幅を可能な限り小さくすることが好ましいが、筐体１００内部の気圧が大気圧よりも低い状況となったときに、筐体１００内部が短時間で大気に戻るようにする点や製造要件を考慮して、スリット溝２２３の溝幅を決定する。 In addition, it is preferable that the slit groove 223 for air circulation has a groove width as small as possible from the viewpoint of preventing foreign matter from entering the inside of the housing 100, but the pressure inside the housing 100 is lower than the atmospheric pressure. Then, the groove width of the slit groove 223 is determined in consideration of the point that the inside of the housing 100 returns to the atmosphere in a short time and the manufacturing requirements.
　下部ハウジング２３は、円筒形状の取付部２３ａの上部にフランジ（例えば六角フランジ）２３ｂが一体形成された部材（例えば金属製の部材）である。下部ハウジング２３には断面円形の下部流体通路２３１が形成されている。また、下部ハウジング２３の取付部２３ａの外周面には雄ねじ２３ｃが形成されている。 The lower housing 23 is a member (for example, a metal member) in which a flange (for example, a hexagonal flange) 23b is integrally formed on an upper portion of a cylindrical mounting portion 23a. A lower fluid passage 231 having a circular cross section is formed in the lower housing 23. A male screw 23 c is formed on the outer peripheral surface of the mounting portion 23 a of the lower housing 23.
　下部流体通路２３１は、筐体１００内部側の大径部２３１ａと、この大径部２３１ａの大気側に位置する小径部２３１ｂとを有する段付きの流体通路である。下部流体通路２３１は下部ハウジング２３の中心軸に沿って延びており、当該下部ハウジング２３を貫通している。下部流体通路２３１の大気側の小径部２３１ｂの内径と、上記したバルブハウジング２２の筐体１００内部側の小径部２２１ｂとの内径は等しい。 The lower fluid passage 231 is a stepped fluid passage having a large-diameter portion 231a inside the housing 100 and a small-diameter portion 231b located on the atmosphere side of the large-diameter portion 231a. The lower fluid passage 231 extends along the central axis of the lower housing 23 and passes through the lower housing 23. The inner diameter of the small-diameter portion 231b on the atmosphere side of the lower fluid passage 231 is equal to the inner diameter of the small-diameter portion 221b on the inside of the housing 100 of the valve housing 22 described above.
　そして、この例では、下部流体通路２３１の大径部２３１ａと小径部２３１ｂとの間の段部２３１ｃが、筐体１００内部側から大気側（バルブハウジング２２側）に向かうに従って直径が漸次拡大する逆円すいテーパ形状（逆円すいテーパ面）となっている。この構成（逆テーパ形状の段部２３１ｃ）が本発明の特徴部分である。 In this example, the step portion 231c between the large diameter portion 231a and the small diameter portion 231b of the lower fluid passage 231 gradually increases in diameter from the inside of the housing 100 toward the atmosphere side (valve housing 22 side). It has a reverse cone taper shape (reverse cone taper surface). This configuration (inverted tapered step 231c) is a feature of the present invention.
　以上の下部ハウジング２３と上記したバルブハウジング２２とはインサート成形等によって一体形成されており、この下部ハウジング２３の大気側の小径部２３１ｂと、バルブハウジング２２の筐体１００内部側の小径部２２１ｂとが連通している。また、上記したようにバルブ部流体通路２２１と上部流体通路２１１とが連通しており、従って、ハウジング２には、下部流体通路２３１、バルブ部流体通路２２１、及び、上部流体通路２１１（連通路２１２も含む）からなる流体通路（貫通通路）が形成されている。 The lower housing 23 and the valve housing 22 described above are integrally formed by insert molding or the like, and a small-diameter portion 231b on the atmosphere side of the lower housing 23 and a small-diameter portion 221b on the inside of the housing 100 of the valve housing 22 Are communicating. Further, as described above, the valve part fluid passage 221 and the upper fluid passage 211 communicate with each other. Therefore, the lower fluid passage 231, the valve part fluid passage 221, and the upper fluid passage 211 (communication passage) are provided in the housing 2. 212 (including 212) is formed.
　キャップ４は、下部のみが開口された略円筒形状の部材で、上部ハウジング２１及びバルブハウジング２２の円形フランジ２２ａを覆うように配置される。キャップ４には、内面下部に係止爪４ａが設けられており、この係止爪４ａがバルブハウジング２２の円形フランジ２２ａに係止することによって、ハウジング１からのキャップ４の脱落が防止されている。 The cap 4 is a substantially cylindrical member that is open only at the bottom, and is arranged so as to cover the circular flange 22a of the upper housing 21 and the valve housing 22. The cap 4 is provided with a locking claw 4a at the lower inner surface, and the locking claw 4a is locked to the circular flange 22a of the valve housing 22 to prevent the cap 4 from falling off the housing 1. Yes.
　このようなキャップ４の内周面と円形フランジ２２ａの外周面との間に隙間Ｃが設けられている。さらに、円形フランジ２２ａの外周部には複数のスリット溝２２２ａが形成されているので、それら隙間Ｃ及びスリット溝２２２ａによってキャップ４の内部が大気に開放される。これによって上部流体通路２１１の上端（連通路２１２）が大気に開放される。 A gap C is provided between the inner peripheral surface of the cap 4 and the outer peripheral surface of the circular flange 22a. Furthermore, since a plurality of slit grooves 222a are formed on the outer peripheral portion of the circular flange 22a, the inside of the cap 4 is opened to the atmosphere by the gaps C and the slit grooves 222a. As a result, the upper end (communication passage 212) of the upper fluid passage 211 is opened to the atmosphere.
　以上のブリーザプラグ１は、上部ハウジング２１を上側とし、下部ハウジング２３を下側とする姿勢で、下部ハウジング２３の雄ねじ２３ｃを筐体１００のボス穴（雌ねじ穴）１０１にねじ込むことによって筐体１００に取り付けられる。この取り付け状態で、下部流体通路２３１の下端（大径部２３１ａの下端）が筐体１００内部に連通し、上部流体通路２１１の上端（連通路２１２）が大気に開放される。 The breather plug 1 described above is configured such that the male screw 23c of the lower housing 23 is screwed into the boss hole (female screw hole) 101 of the housing 100 with the upper housing 21 as the upper side and the lower housing 23 as the lower side. Attached to. In this attached state, the lower end of the lower fluid passage 231 (the lower end of the large diameter portion 231a) communicates with the inside of the housing 100, and the upper end of the upper fluid passage 211 (the communication passage 212) is opened to the atmosphere.
　次に、動力伝達装置の筐体１００に取り付けたブリーザプラグ１の動作を図１及び図４～図６を参照して説明する。 Next, the operation of the breather plug 1 attached to the casing 100 of the power transmission device will be described with reference to FIGS. 1 and 4 to 6.
　－通常時－
　通常時においては、図１に示すように、チェックボール３が自重によってバルブハウジング２２の弁座２２２に着座している。このチェックボール３の弁座２２２への着座によってバルブ部流体通路２２１が塞がれるので、外部から筐体１００内部に異物が混入することを防ぐことができる。 -Normal time-
In the normal state, as shown in FIG. 1, the check ball 3 is seated on the valve seat 222 of the valve housing 22 by its own weight. Since the valve portion fluid passage 221 is blocked by the seating of the check ball 3 on the valve seat 222, it is possible to prevent foreign matters from entering the housing 100 from the outside.
　－大気開放時時－
　筐体１００内部の気圧が上昇したときには、図４に示すように、チェックボール３がバルブハウジング２２の弁座２２２から離座し、バルブ部流体通路２２１内に浮き上がる。このように筐体１００内部の気圧でチェックボール３が浮いた状態（開弁状態）になると、筐体１００内部が、下部流体通路２３１、バルブ部流体通路２２１（大径部２２１ａ）の内面とチェックボール３の外周面との間の隙間Ｄ、上部流体通路２１１、及び、連通路２１２を通じて大気に開放され、筐体１００内部に気圧が低下して大気圧となる。 -When open to the atmosphere-
When the air pressure inside the housing 100 increases, the check ball 3 moves away from the valve seat 222 of the valve housing 22 and floats in the valve portion fluid passage 221 as shown in FIG. Thus, when the check ball 3 is in a floating state (opened state) due to the atmospheric pressure inside the housing 100, the inside of the housing 100 is connected to the inner surfaces of the lower fluid passage 231 and the valve fluid passage 221 (large diameter portion 221a). The air is released to the atmosphere through the gap D with the outer peripheral surface of the check ball 3, the upper fluid passage 211, and the communication passage 212, and the atmospheric pressure is reduced to the atmospheric pressure inside the housing 100.
　ここで、大気開放時において、筐体１００内部の空気が下部流体通路２３１の大径部２３１ａに流入するが、その一部つまり大径部２３１ａの内周面２３１ａｆに沿って上昇する空気は、図５に示すように、大径部２３１ａと小径部２３１ｂとの間の逆円すいテーパ形状の段部２３１ｃによって筐体１００内部側に戻されるので、空気流れに乱れが生じて、段部２３１ｃの周辺において空気流れの滞留が発生する。空気流れの滞留が発生すると、空気中に浮遊するオイルミストが落下する。すなわち、空気中に浮遊するオイルミストは、空気の流れにのって下部流体通路２３１の大径部２３１ａ内を上昇するが、その空気流れに滞留が生じると、上昇エネルギがなくなって自重によって落下する。 Here, when the atmosphere is released, the air inside the casing 100 flows into the large diameter portion 231a of the lower fluid passage 231, but a part thereof, that is, the air rising along the inner peripheral surface 231af of the large diameter portion 231a, As shown in FIG. 5, since it is returned to the inside of the housing 100 by the stepped portion 231c having an inverted conical taper shape between the large diameter portion 231a and the small diameter portion 231b, the air flow is disturbed, and the step portion 231c Air flow stagnation occurs in the vicinity. When the stagnation of the air flow occurs, the oil mist floating in the air falls. That is, the oil mist floating in the air rises in the large-diameter portion 231a of the lower fluid passage 231 along the air flow, but when the air flow stays, the rising energy disappears and falls by its own weight. To do.
　これによって、大径部２３１ａから小径部２３１ｂ側に向かうオイルミストを抑制することができ、オイルミストの外部への漏出を抑制することができる。しかも、そのような効果を、オイルミスト分離のための新たな部材などを用いることなく、下部流体通路２３１の大径部２３１ａと小径部２３１ｂとの間の段部２３１ｃを逆円すいテーパ形状にする、という簡単かつ安価な構成のもとに達成することができる。 Thus, oil mist from the large diameter portion 231a toward the small diameter portion 231b can be suppressed, and leakage of the oil mist to the outside can be suppressed. In addition, such an effect is achieved by making the step portion 231c between the large diameter portion 231a and the small diameter portion 231b of the lower fluid passage 231 into an inverted conical taper shape without using a new member for oil mist separation. Can be achieved with a simple and inexpensive configuration.
　なお、この例のブリーザプラグ１では、例えば、大気圧の低い高地の走行中においてチェックボール３が弁座２２２から離座して筐体１００内部の気圧が低下し、その後にチェックボール３が弁座２２２に着座して筐体１００内部の気圧が低い状態になっても、平地に戻ったときには、チェックボール３の弁座２２２に形成した空気流通用のスリット溝２２３を通じて空気（外気）が筐体１００内部に流入するので、筐体１００内部の気圧が大気圧よりも低い状態が長く継続されることはない。 In the breather plug 1 of this example, for example, the check ball 3 is separated from the valve seat 222 during traveling at a high altitude where the atmospheric pressure is low, and the pressure inside the housing 100 is lowered. Even when the air pressure inside the housing 100 becomes low after sitting on the seat 222, when returning to the flat ground, air (outside air) is passed through the slit groove 223 for air circulation formed in the valve seat 222 of the check ball 3. Since the air flows into the body 100, the state where the pressure inside the housing 100 is lower than the atmospheric pressure is not continued for a long time.
　また、筐体１００内部に収容されたオイルは、例えば筐体１００の傾斜など要因によってブリーザプラグ１にまで上昇する場合がある。このようにしてオイルが上昇しても、図６に示すように、油面に浮かぶチェックボール３が上部流体通路２１１の下端部の円すいテーパ面２１１ａに当接した時点で上部流体通路２１１が塞がれるので、オイルが外部に漏れ出すことを防止することができる。 Also, the oil contained in the housing 100 may rise to the breather plug 1 due to factors such as the inclination of the housing 100, for example. Even if the oil rises in this way, as shown in FIG. 6, the upper fluid passage 211 is blocked when the check ball 3 floating on the oil surface comes into contact with the conical tapered surface 211a at the lower end of the upper fluid passage 211. Since it peels off, it can prevent that oil leaks outside.
　ここで、この例のブリーザプラグ１において、下部流体通路２３１の大径部２３１ａと小径部２３１ｂとの間の段部２３１ｃの寸法（大径部２３１ａと小径部２３１ｂとの内径差）、及び、段部２３１ｃのテーパ角は、特に限定されないが、段部２３１ｃ付近で上記した空気流れの滞留が生じやすいような値（内径差・テーパ角）を、実験・計算等によって取得して設定すればよい。 Here, in the breather plug 1 of this example, the dimension of the step portion 231c between the large diameter portion 231a and the small diameter portion 231b of the lower fluid passage 231 (inner diameter difference between the large diameter portion 231a and the small diameter portion 231b), and The taper angle of the step portion 231c is not particularly limited, but a value (inner diameter difference / taper angle) at which the above-described air flow is likely to stay in the vicinity of the step portion 231c may be acquired and set by experiments and calculations. Good.
　［実施形態２］
　図７は本発明のブリーザプラグの他の例を示す縦断面図である。 [Embodiment 2]
FIG. 7 is a longitudinal sectional view showing another example of the breather plug of the present invention.
　この例のブリーザプラグ１Ａは、下部流体通路２３１の小径部２３１ｂ（内径：例えば３ｍｍ程度）の内周面２３１ｂｆ、及び、バルブ部流体通路２２１の小径部２２１ｂの内周面２２１ｂｆに、軸方向に螺旋状に延びる螺旋状の溝（具体的には、雌ねじ）２３２を形成している点に特徴がある。それ以外の構成は、上記した［実施形態１］と同じである。 The breather plug 1A of this example is axially formed on the inner peripheral surface 231bf of the small diameter portion 231b (inner diameter: about 3 mm, for example) of the lower fluid passage 231 and the inner peripheral surface 221bf of the small diameter portion 221b of the valve portion fluid passage 221. A feature is that a spiral groove (specifically, an internal thread) 232 extending spirally is formed. Other configurations are the same as those in [Embodiment 1].
　この例のブリーザプラグ１Ａによれば、筐体１００内部の大気開放時に、筐体１００内部の空気が下部流体通路２３１の大径部２３１ａから小径部２３１ｂに流入したときに、螺旋状の溝２３２によって旋回流が発生する。この旋回流によって空気中のオイルミストが小径部２３１ｂ，２２１ｂの内周面２３１ｂｆ，２２１ｂｆに向けて吹き飛ばされ、当該内周面２３１ｂｆ，２２１ｂｆに付着して液状となった後、小径部２３１ｂ，２２１ｂの内周面２３１ｂｆ，２２１ｂｆ（螺旋状の溝２３２）を伝って下方に落下する。 According to the breather plug 1A of this example, when the air inside the housing 100 is opened to the atmosphere, when the air inside the housing 100 flows into the small diameter portion 231b from the large diameter portion 231a of the lower fluid passage 231, the spiral groove 232 is formed. Causes a swirl flow. The oil mist in the air is blown off toward the inner peripheral surfaces 231bf and 221bf of the small- diameter portions 231b and 221b by this swirl flow, adheres to the inner peripheral surfaces 231bf and 221bf and becomes liquid, and then the small- diameter portions 231b and 221b. Of the inner peripheral surfaces 231bf and 221bf (spiral groove 232) of the first and second surfaces.
　従って、上記した逆円すいテーパ形状の段部２３１ｃでは分離できなかったオイルミストが、下部流体通路２３１の大径部２３１ａを通過して小径部２３１ｂ内に浸入しても、その小径部２３１ｂ（小径部２２１ｂも含む）においてオイルミストを空気から分離することができるので、筐体１００外部へのオイルミストの漏出をより効果的に抑制することができる。 Therefore, even if the oil mist that could not be separated by the above-mentioned inverted conical tapered step 231c passes through the large diameter portion 231a of the lower fluid passage 231 and enters the small diameter portion 231b, the small diameter portion 231b (small diameter) In addition, the oil mist can be separated from the air in the portion 221b), so that leakage of the oil mist to the outside of the housing 100 can be more effectively suppressed.
　ここで、螺旋状の溝は雌ねじ以外の形態であってもよい。また、螺旋状の溝は、下部流体通路２３１の小径部２３１ｂの内周面２３１ｂｆのみに形成しておいてもよい。 Here, the spiral groove may have a form other than the internal thread. Further, the spiral groove may be formed only on the inner peripheral surface 231bf of the small diameter portion 231b of the lower fluid passage 231.
　なお、図７の構成に加えて、下部流体通路２３１の大径部２３１ａの内周面にも螺旋状の溝を形成しておいてもよい。 In addition to the configuration of FIG. 7, a spiral groove may be formed on the inner peripheral surface of the large diameter portion 231 a of the lower fluid passage 231.
　［実施形態３］
　図８は本発明のブリーザプラグの別の例を示す縦断面図である。 [Embodiment 3]
FIG. 8 is a longitudinal sectional view showing another example of the breather plug of the present invention.
　この例のブリーザプラグ１Ｂは、下部流体通路２３１の大径部２３１ａの下端部２３１ｄ（筐体１００内部側の端部）を、筐体１００内部側から大気側（小径部２３１ｂ側）に向かうに従って直径が漸次縮小する円すいテーパ形状（円すいテーパ面）としている点に特徴がある。それ以外の構成は、上記した［実施形態１］と同じである。 In the breather plug 1B of this example, the lower end portion 231d (end portion inside the casing 100) of the large diameter portion 231a of the lower fluid passage 231 is moved from the inside of the casing 100 toward the atmosphere side (small diameter portion 231b side). It is characterized by a conical taper shape (conical taper surface) whose diameter gradually decreases. Other configurations are the same as those in [Embodiment 1].
　この例のブリーザプラグ１Ｂによれば、図８に示すように、下部流体通路２３１の大径部２３１ａの筐体１００内部側の端部付近に空気流れに乱れが生じて空気流れの一部が滞留するので、下部流体通路２３１内に流入するオイルミストを低減することができる。 According to the breather plug 1B of this example, as shown in FIG. 8, the air flow is disturbed near the end of the large-diameter portion 231a of the lower fluid passage 231 on the inside of the casing 100, and a part of the air flow is generated. Since it stays, the oil mist flowing into the lower fluid passage 231 can be reduced.
　なお、大径部２３１ａの下端部（筐体１００内部側の端部）を、図８とは逆のテーパ形状、つまり、筐体１００内部側から大気側（小径部２３１ｂ側）に向かうに従って直径が漸次拡大する逆円すいテーパ形状（逆円すいテーパ面）としておいてもよい。 Note that the lower end of the large-diameter portion 231a (the end on the inside of the housing 100) has a tapered shape opposite to that in FIG. 8, that is, the diameter increases from the inside of the housing 100 toward the atmosphere (the small-diameter portion 231b side). May be formed in an inverted conical taper shape (inverted conical taper surface) that gradually increases.
　また、この例において、図９に示すように、下部流体通路２３１の小径部２３１ｂの内周面２３１ｂｆ、及び、バルブ部流体通路２２１の小径部２２１ｂの内周面２２１ｂｆに、上記した［実施形態２］と同様に、螺旋状の溝２３２（雌ねじ）を形成しておいもよい。 In this example, as shown in FIG. 9, the inner peripheral surface 231bf of the small diameter portion 231b of the lower fluid passage 231 and the inner peripheral surface 221bf of the small diameter portion 221b of the valve fluid passage 221 are described above [Embodiment]. 2], a spiral groove 232 (internal thread) may be formed.
　ここで、以上の各実施形態１～３において、下部流体通路２３１の大径部２３１ａと小径部２３１ｂとの間の段部２３１ｃの形状は、例えば、図１０に示すような円すい凹面状であってもよい。 Here, in each of the above first to third embodiments, the shape of the step portion 231c between the large diameter portion 231a and the small diameter portion 231b of the lower fluid passage 231 is, for example, a conical concave shape as shown in FIG. May be.
　－他の実施形態－
　以上の例では、ハウジングの流体通路内に設ける弁体をチェックボールとしているが、本発明これに限られることなく、他の形状の弁体を用いたブリーザプラグにも適用可能である。 -Other embodiments-
In the above example, the valve body provided in the fluid passage of the housing is a check ball. However, the present invention is not limited to this, and the present invention can be applied to breather plugs using valve bodies of other shapes.
　以上の例では、ハウジングの流体通路内にチェックボール（弁体）を設けたブリーザプラグに本発明を適用した例を示したが、本発明はこれに限られることなく、チェックボール（弁体）を備えていない大気開放型のブリーザプラグにも適用可能である。 In the above example, the example in which the present invention is applied to the breather plug in which the check ball (valve element) is provided in the fluid passage of the housing is shown, but the present invention is not limited to this, and the check ball (valve element) It can also be applied to an open air breather plug that does not include
　以上の例では、ハイブリッド車両の動力伝達装置の筐体に取り付けられるブリーザプラグに本発明を適用した例を示したが、これに限られることなく、駆動力源としてエンジンのみを搭載した通常車（コンベショナル車）の動力伝達装置（変速機など）の筐体に取り付けられるブリーザプラグにも本発明は適用可能である。また、例えば車両に搭載されるデファレンシャル機構の筐体に取り付けられるブリーザプラグにも本発明は適用可能である。さらに、筐体内部にオイルが収容される各種装置や各種タンクなど用いられるブリーザプラグにも本発明は適用可能である。 In the above example, the example in which the present invention is applied to the breather plug attached to the casing of the power transmission device of the hybrid vehicle has been described. However, the present invention is not limited thereto. The present invention can also be applied to a breather plug attached to a housing of a power transmission device (such as a transmission) of a conventional vehicle. Further, the present invention can be applied to a breather plug attached to a housing of a differential mechanism mounted on a vehicle, for example. Furthermore, the present invention is also applicable to breather plugs that are used in various devices and various tanks in which oil is stored in the housing.
　本発明は、車両に搭載される動力伝達装置をはじめとする各種装置や各種タンクの内部を大気に開放するブリーザプラグに利用することができる。 The present invention can be used for various devices including a power transmission device mounted on a vehicle and a breather plug that opens the inside of various tanks to the atmosphere.

Claims (4)

  1. 　筐体に取り付けられ、前記筐体の内部を大気に開放するブリーザプラグであって、
    　前記筐体に取り付けた状態で、一端が前記筐体の内部に連通し、他端が大気に開放される流体通路が形成されたハウジングを備え、前記ハウジングの流体通路は、前記筐体内部に連通する大径部と、前記大径部の大気側に位置し、当該大径部に段部を介して連なる小径部とを有し、前記大径部と小径部との間の段部が、前記筐体内部側から大気側に向かうに従って径が拡大する逆テーパ形状となっていることを特徴とするブリーザプラグ。     A breather plug that is attached to a housing and opens the inside of the housing to the atmosphere,
    In a state of being attached to the housing, the housing includes a housing formed with a fluid passage in which one end communicates with the inside of the housing and the other end is opened to the atmosphere. A large-diameter portion that communicates, and a small-diameter portion that is located on the atmosphere side of the large-diameter portion and communicates with the large-diameter portion via a step portion, and a step portion between the large-diameter portion and the small-diameter portion A breather plug having a reverse taper shape whose diameter increases from the inside of the housing toward the atmosphere.
  2. 　請求項１記載のブリーザプラグにおいて、
    　前記流体通路の内部に設けられた弁座と、前記弁座に大気側から着座するように配設された弁体とを備え、前記弁座に対して筐体内部側の流体通路が、前記大径部と小径部とを有する段付きの流体通路となっており、前記段付きの流体通路の前記大径部と小径部との間の段部が、前記筐体内部側から大気側に向かうに従って径が拡大する逆テーパ形状となっていることを特徴とするブリーザプラグ。     The breather plug according to claim 1.
    A valve seat provided inside the fluid passage; and a valve body disposed on the valve seat so as to be seated from the atmosphere side. The stepped fluid passage has a large diameter portion and a small diameter portion, and the step portion between the large diameter portion and the small diameter portion of the stepped fluid passage is from the inside of the housing to the atmosphere side. A breather plug characterized by having a reverse taper shape whose diameter increases as it goes.
  3. 　請求項１または２記載のブリーザプラグにおいて、
    　前記流体通路の内周面に、螺旋状の溝が形成されていることを特徴とするブリーザプラグ。     The breather plug according to claim 1 or 2,
    A breather plug, wherein a spiral groove is formed on an inner peripheral surface of the fluid passage.
  4. 　請求項１～３のいずれか１つに記載のブリーザプラグにおいて、
    　前記流体通路の筐体内部側の端部がテーパ形状となっていることを特徴とするブリーザプラグ。     The breather plug according to any one of claims 1 to 3,
    A breather plug, wherein an end portion of the fluid passage inside the casing is tapered.
PCT/JP2009/054935 2009-03-13 2009-03-13 Breather plug WO2010103662A1 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013029163A (en) * 2011-07-28 2013-02-07 Toyota Motor Corp Breather device
JP2013083300A (en) * 2011-10-07 2013-05-09 Toyota Motor Corp Breather plug
FR3035478A1 (en) * 2015-04-24 2016-10-28 Technoboost AUTOMATIC PURGE DEVICE FOR A HYDRAULIC CIRCUIT COMPRISING A TARE NON-RETURN VALVE
CN109424415A (en) * 2017-08-29 2019-03-05 郑州宇通客车股份有限公司 Throttle valve and engine-cooling system, the vehicle for using the throttle valve

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JPS60159281U (en) * 1984-03-30 1985-10-23 アイシン精機株式会社 Breather device
JPS61124770U (en) * 1985-01-25 1986-08-06
JPS61137158U (en) * 1985-02-15 1986-08-26
JPS62176566U (en) * 1986-04-30 1987-11-10
JPS6387380U (en) * 1986-11-28 1988-06-07
JPS63171771U (en) * 1987-04-30 1988-11-08
JPH0293577U (en) * 1989-01-13 1990-07-25
JPH0410170U (en) * 1990-05-15 1992-01-28

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60159281U (en) * 1984-03-30 1985-10-23 アイシン精機株式会社 Breather device
JPS61124770U (en) * 1985-01-25 1986-08-06
JPS61137158U (en) * 1985-02-15 1986-08-26
JPS62176566U (en) * 1986-04-30 1987-11-10
JPS6387380U (en) * 1986-11-28 1988-06-07
JPS63171771U (en) * 1987-04-30 1988-11-08
JPH0293577U (en) * 1989-01-13 1990-07-25
JPH0410170U (en) * 1990-05-15 1992-01-28

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013029163A (en) * 2011-07-28 2013-02-07 Toyota Motor Corp Breather device
JP2013083300A (en) * 2011-10-07 2013-05-09 Toyota Motor Corp Breather plug
FR3035478A1 (en) * 2015-04-24 2016-10-28 Technoboost AUTOMATIC PURGE DEVICE FOR A HYDRAULIC CIRCUIT COMPRISING A TARE NON-RETURN VALVE
CN109424415A (en) * 2017-08-29 2019-03-05 郑州宇通客车股份有限公司 Throttle valve and engine-cooling system, the vehicle for using the throttle valve

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