JP2015059607A - Valve device - Google Patents

Valve device Download PDF

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JP2015059607A
JP2015059607A JP2013193414A JP2013193414A JP2015059607A JP 2015059607 A JP2015059607 A JP 2015059607A JP 2013193414 A JP2013193414 A JP 2013193414A JP 2013193414 A JP2013193414 A JP 2013193414A JP 2015059607 A JP2015059607 A JP 2015059607A
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Prior art keywords
valve
shaft
upstream
downstream
valve portion
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JP6036623B2 (en
Inventor
徳幸 稲垣
Noriyuki Inagaki
徳幸 稲垣
勇一朗 守谷
Yuichiro Moriya
勇一朗 守谷
宮崎　真輔
Shinsuke Miyazaki
真輔 宮崎
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Denso Corp
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Denso Corp
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Priority to DE201410113305 priority patent/DE102014113305A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/09—Constructional details, e.g. structural combinations of EGR systems and supercharger systems; Arrangement of the EGR and supercharger systems with respect to the engine
    • F02M26/10—Constructional details, e.g. structural combinations of EGR systems and supercharger systems; Arrangement of the EGR and supercharger systems with respect to the engine having means to increase the pressure difference between the exhaust and intake system, e.g. venturis, variable geometry turbines, check valves using pressure pulsations or throttles in the air intake or exhaust system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
    • F02M26/06—Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream of the compressor

Abstract

PROBLEM TO BE SOLVED: To provide a valve device in which a valve element is inclined with respect to a streamline direction of a fluid passage at a smallest opening, capable of canceling a rotational torque acting on a shaft by a flow velocity gradient at the smallest opening.SOLUTION: A valve element 4 of an intake throttle valve 1 is provided into a generally Z-shape such that an upstream valve portion 4a and a downstream valve portion 4b differ in inclination angle in a view in an axial direction and that an area S1 of the upstream valve portion 4a is larger than an area S2 of the downstream valve portion 4b. As a result, it is possible to set a passive torque (S1×P1) of the upstream valve portion 4a generally identical to a passive torque (S2×P2) of the downstream valve portion 4b, and set generally zero a rotational torque T acting on a shaft 3 by a flow velocity gradient. As a consequence, it is possible to reduce a rotation load at a time of opening the valve element 4 from a smallest opening state or of controlling the valve element 4 at around the smallest opening, and to reduce a load on an electrical actuator or that in a torque transmission range.

Description

本発明は、流体通路の内部で弁体（バルブ）を回動させるバタフライ型のバルブ装置に関し、特に最小開度時（弁体が流体通路を最も閉じる時：全閉に限らない）に弁体が流体通路の流線方向（流体の流れ方向に沿う流体通路の中心線）に対して傾斜するバルブ装置に関する。   The present invention relates to a butterfly-type valve device that rotates a valve body (valve) inside a fluid passage, and particularly to a valve body at a minimum opening (when the valve body closes the fluid passage most: not limited to full closing). The present invention relates to a valve device that is inclined with respect to the streamline direction of the fluid passage (center line of the fluid passage along the fluid flow direction).

図３を参照して背景技術を説明する。なお、以下では、後述する実施例と同一機能物に同一符合を付す。
図３（ａ）に示すように、最小開度時に弁体４が吸気通路２ａ（流体通路の一例）の流線方向に対して傾斜する吸気絞り弁１（バルブ装置の一例）が知られている（例えば、特許文献１参照）。 The background art will be described with reference to FIG. In the following description, the same reference numerals are given to the same functional components as those in Examples described later.
As shown in FIG. 3A, there is known an intake throttle valve 1 (an example of a valve device) in which a valve element 4 is inclined with respect to a streamline direction of an intake passage 2a (an example of a fluid passage) at a minimum opening. (For example, refer to Patent Document 1).

吸気絞り弁１は、最小開度時であっても、図３（ｂ）に示すように、弁体４の周囲にリング状の隙間αが設けられるものであり、隙間αから吸気が流れる。このため、最小開度時に弁体４には、吸気の流れによって流速勾配が生じる。この流速勾配によって弁体４には非対称の圧力Ｐ１、Ｐ２が作用する。その結果、最小開度時においてシャフト３に回動トルクＴが生じてしまう。   As shown in FIG. 3B, the intake throttle valve 1 is provided with a ring-shaped gap α around the valve body 4 so that intake air flows from the gap α. For this reason, at the minimum opening, a flow velocity gradient is generated in the valve body 4 due to the flow of intake air. Asymmetric pressures P1 and P2 act on the valve body 4 by this flow velocity gradient. As a result, rotational torque T is generated in the shaft 3 at the minimum opening.

具体的に最小開度時には、上流弁部４ａ（弁体４のうちシャフト３より上流側の部分）に加わる圧力Ｐ１が、下流弁部４ｂ（弁体４のうちシャフト３より上流側の部分）に加わる圧力Ｐ２より大きくなる（Ｐ１＞Ｐ２）。
この圧力差（Ｐ１−Ｐ２）によってシャフト３には、閉弁方向へ回動しようとする回転トルクＴが発生する。この回動トルクＴの発生によって、最小開度状態から弁体４を開弁させる際や、最小開度付近で弁体４をコントロールする際の回動負荷が大きくなってしまう。 Specifically, at the minimum opening, the pressure P1 applied to the upstream valve portion 4a (the portion of the valve body 4 upstream of the shaft 3) is the downstream valve portion 4b (the portion of the valve body 4 upstream of the shaft 3). (P1> P2).
Due to this pressure difference (P1-P2), a rotational torque T is generated on the shaft 3 so as to rotate in the valve closing direction. Due to the generation of the rotational torque T, the rotational load when the valve body 4 is opened from the minimum opening state or when the valve body 4 is controlled near the minimum opening degree becomes large.

特開２０１２−２３７３０６号公報JP 2012-237306 A

本発明は、上記問題点に鑑みてなされたものであり、その目的は、最小開度時に弁体が流体通路の流線方向に対して傾斜するバルブ装置において、最小開度時に流速勾配によってシャフトに作用する回動トルクを低減あるいはキャンセルさせることにある。   The present invention has been made in view of the above problems, and an object of the present invention is to provide a valve device in which a valve body is inclined with respect to a streamline direction of a fluid passage at a minimum opening, and a shaft is formed by a flow velocity gradient at the minimum opening. This is to reduce or cancel the rotational torque acting on the motor.

本発明のバルブ装置は、上流弁部の面積より下流弁部の面積を大きく設ける。
これにより、最小開度時において、上流弁部に作用する圧力と、下流弁部に作用する圧力とを略等しくすることができる。このため、流速勾配によってシャフトに作用する回動トルクを低減あるいはキャンセルすることができる。 In the valve device of the present invention, the area of the downstream valve portion is larger than the area of the upstream valve portion.
Thereby, at the time of the minimum opening, the pressure acting on the upstream valve portion and the pressure acting on the downstream valve portion can be made substantially equal. For this reason, the rotational torque which acts on the shaft by the flow velocity gradient can be reduced or canceled.

（ａ）シャフトの軸方向から見た吸気絞り弁の説明図、（ｂ）吸気通路の流線方向から見た吸気絞り弁の説明図である（実施例１）。(A) It is explanatory drawing of the intake throttle valve seen from the axial direction of a shaft, (b) It is explanatory drawing of the intake throttle valve seen from the streamline direction of the intake passage (Example 1). （ａ）シャフトの軸方向から見た吸気絞り弁の説明図、（ｂ）吸気通路の流線方向から見た吸気絞り弁の説明図である（実施例２）。(A) It is explanatory drawing of the intake throttle valve seen from the axial direction of a shaft, (b) It is explanatory drawing of the intake throttle valve seen from the streamline direction of the intake passage (Example 2). （ａ）シャフトの軸方向から見た吸気絞り弁の説明図、（ｂ）吸気通路の流線方向から見た吸気絞り弁の説明図である（背景技術）。(A) It is explanatory drawing of the intake throttle valve seen from the axial direction of the shaft, (b) It is explanatory drawing of the intake throttle valve seen from the streamline direction of the intake passage (background art).

発明を実施するための形態を以下の実施例において説明する。   Modes for carrying out the invention will be described in the following examples.

本発明を低圧ＥＧＲ装置の吸気絞り弁に適用した具体的な一例（実施例）を、図面を参照して説明する。なお、以下の実施例は具体的な一例を開示するものであって、本発明が実施例に限定されないことは言うまでもない。   A specific example (example) in which the present invention is applied to an intake throttle valve of a low pressure EGR device will be described with reference to the drawings. The following examples disclose specific examples, and it goes without saying that the present invention is not limited to the examples.

［実施例１］
図１を参照して実施例１を説明する。
この実施例１は、本発明をエンジン吸排気システムにおける低圧ＥＧＲ装置の吸気絞り弁１に適用したものであり、エンジン吸排気システムには、低圧ＥＧＲ装置とは別に、高圧ＥＧＲ装置が設けられる。 [Example 1]
Embodiment 1 will be described with reference to FIG.
In the first embodiment, the present invention is applied to an intake throttle valve 1 of a low-pressure EGR device in an engine intake / exhaust system. The engine intake / exhaust system is provided with a high-pressure EGR device separately from the low-pressure EGR device.

高圧ＥＧＲ装置は、高排気圧範囲（ＤＰＦや触媒の排気上流側など、高い排気圧が発生する範囲）の排気通路の内部と、高吸気負圧発生範囲（スロットルバルブの吸気下流側など、高い吸気負圧が発生する範囲）の吸気通路２ａの内部とを接続して、多量のＥＧＲガスをエンジンへ戻すことを得意とする排気ガス再循環装置である。   The high-pressure EGR system has a high exhaust pressure range (a range where high exhaust pressure is generated, such as the exhaust side upstream of DPF or catalyst) and a high intake negative pressure generation range (such as the downstream side of the throttle valve) This is an exhaust gas recirculation device that is good at returning a large amount of EGR gas to the engine by connecting to the inside of the intake passage 2a in a range where intake negative pressure is generated.

一方、低圧ＥＧＲ装置は、低排気圧範囲（ＤＰＦや触媒の排気下流側など、低い排気圧が発生する範囲）の排気通路の内部と、低吸気負圧発生範囲（スロットルバルブの吸気上流側で、低い吸気負圧が発生する範囲）の吸気通路２ａの内部とを接続して、少量のＥＧＲガスをエンジンに戻すことを得意とする排気ガス再循環装置である。   On the other hand, the low-pressure EGR device has a low exhaust pressure range (a range where low exhaust pressure is generated, such as the exhaust downstream side of a DPF or a catalyst), and a low intake negative pressure generation range (the intake upstream side of the throttle valve). This is an exhaust gas recirculation device that is good at returning a small amount of EGR gas to the engine by connecting to the inside of the intake passage 2a in a range where low intake negative pressure is generated.

低圧ＥＧＲ装置は、排気ガスの一部をＥＧＲガスとして吸気通路２ａの吸気上流側に戻す低圧ＥＧＲ流路を備えている。この低圧ＥＧＲ流路には、低圧ＥＧＲ流路の開度を調整することでＥＧＲガスの流量調整を行なう低圧ＥＧＲ調整弁の他に、吸気側に戻されるＥＧＲガスの冷却を行なう低圧ＥＧＲクーラが設けられている。
また、低圧ＥＧＲ装置は、吸気通路２ａと低圧ＥＧＲ流路の合流部に吸気負圧を発生させるための吸気絞り弁１を設けている。 The low-pressure EGR device includes a low-pressure EGR passage that returns a part of the exhaust gas as EGR gas to the intake upstream side of the intake passage 2a. In addition to the low pressure EGR adjustment valve that adjusts the flow rate of the EGR gas by adjusting the opening of the low pressure EGR flow path, the low pressure EGR flow path includes a low pressure EGR cooler that cools the EGR gas returned to the intake side. Is provided.
Further, the low pressure EGR device is provided with an intake throttle valve 1 for generating an intake negative pressure at the junction of the intake passage 2a and the low pressure EGR flow path.

この吸気絞り弁１は、吸気通路２ａを最大に絞った状態（最小開度時）であっても、吸気通路２ａの一部を開放するように設けられるものである。具体的な一例として、吸気絞り弁１が吸気通路２ａを最大に絞った状態であっても、吸気通路２ａの例えば１０％ほどを開放するように設けられる。   The intake throttle valve 1 is provided so as to open a part of the intake passage 2a even when the intake passage 2a is throttled to the maximum (at the minimum opening). As a specific example, even when the intake throttle valve 1 is in a state in which the intake passage 2a is throttled to the maximum, the intake throttle valve 1 is provided so as to open, for example, about 10% of the intake passage 2a.

低圧ＥＧＲ装置は、低排気圧範囲のＥＧＲガスを、低吸気負圧発生範囲に戻すものであるため、少量のＥＧＲガスをエンジンに戻すことを得意とする。しかるに、低圧ＥＧＲ装置を用いて多量のＥＧＲガスをエンジンへ戻したい運転領域が存在しても、低吸気負圧発生範囲にＥＧＲガスを戻す構造の低圧ＥＧＲ装置では多量のＥＧＲガスをエンジンへ戻すことが困難である。
そこで、低圧ＥＧＲ装置は、吸気通路２ａのうち、ＥＧＲガスを戻す箇所（低圧ＥＧＲ流路の合流箇所）に吸気負圧を発生させるための吸気絞り弁１を設けており、低圧ＥＧＲ装置において大きなＥＧＲ量を得たい運転領域では、吸気絞り弁１を閉じる方向（吸気負圧が発生する方向）に開度制御し、低圧ＥＧＲ装置において多量のＥＧＲガスを吸気通路２ａへ導くことを可能にしている。 Since the low pressure EGR device returns the EGR gas in the low exhaust pressure range to the low intake negative pressure generation range, it is good at returning a small amount of EGR gas to the engine. However, even if there is an operation region where a large amount of EGR gas is desired to be returned to the engine using the low pressure EGR device, the low pressure EGR device configured to return the EGR gas to the low intake negative pressure generation range returns a large amount of EGR gas to the engine. Is difficult.
In view of this, the low pressure EGR device is provided with an intake throttle valve 1 for generating an intake negative pressure at a location where the EGR gas is returned (confluence location of the low pressure EGR flow path) in the intake passage 2a. In the operation region where it is desired to obtain the EGR amount, the opening degree is controlled in the direction in which the intake throttle valve 1 is closed (the direction in which the intake negative pressure is generated), so that a large amount of EGR gas can be guided to the intake passage 2a in the low pressure EGR device. Yes.

低圧ＥＧＲ装置は、具体的な一例として、低圧ＥＧＲ調整弁と吸気絞り弁１を組付けた低圧ＥＧＲ弁体ユニットを備える。
この低圧ＥＧＲ弁体ユニットには、低圧ＥＧＲ調整弁を駆動する１つの電動アクチュエータと、この電動アクチュエータの出力特性を変化させて吸気絞り弁１を駆動するリンク装置とを備え、リンク装置を介して伝達された電動アクチュエータの出力によって吸気絞り弁１を駆動するように設けられている。 As a specific example, the low-pressure EGR device includes a low-pressure EGR valve body unit in which a low-pressure EGR adjustment valve and an intake throttle valve 1 are assembled.
The low pressure EGR valve body unit includes one electric actuator that drives the low pressure EGR adjustment valve, and a link device that drives the intake throttle valve 1 by changing the output characteristics of the electric actuator. The intake throttle valve 1 is driven by the output of the transmitted electric actuator.

なお、リンク装置には、電動アクチュエータの出力特性を変化させて吸気絞り弁１へ伝達する特性変換部（カム溝等）が設けられており、低圧ＥＧＲ調整弁が所定開度より大きくなってから低圧ＥＧＲ調整弁の開度アップに連動させて吸気絞り弁１の開度を小さくするように設けられている。   The link device is provided with a characteristic conversion unit (such as a cam groove) that changes the output characteristics of the electric actuator and transmits the change to the intake throttle valve 1, and after the low-pressure EGR adjustment valve becomes larger than a predetermined opening degree. The opening of the intake throttle valve 1 is reduced in conjunction with the increase in the opening of the low pressure EGR adjustment valve.

吸気絞り弁１（バルブ装置の一例）は、
・吸気通路２ａが形成されるハウジング２と、
・このハウジング２に対して回動自在に支持されるシャフト３と、
・このシャフト３に設けられて吸気通路２ａの絞り開度調整を行う弁体４と、
を備えて構成される。
弁体４は、吸気通路２ａ内においてシャフト３にネジやカシメ等で固定されるバタフライバルブであり、シャフト３と一体に回動する。 The intake throttle valve 1 (an example of a valve device)
A housing 2 in which an intake passage 2a is formed;
A shaft 3 that is rotatably supported with respect to the housing 2;
A valve body 4 provided on the shaft 3 for adjusting the throttle opening of the intake passage 2a;
It is configured with.
The valve body 4 is a butterfly valve that is fixed to the shaft 3 with screws, caulking, or the like in the intake passage 2 a and rotates integrally with the shaft 3.

また、低圧ＥＧＲ弁体４ユニットには、低圧ＥＧＲ調整弁を全閉位置へ戻し、吸気絞り弁１を全開位置へ戻すリターンスプリングが設けられるとともに、吸気絞り弁１の弁体４を最大開度で停止させるストッパ部材が設けられている。
これにより、電動アクチュエータの通電停止時（電動モータの通電停止時）に、低圧ＥＧＲ調整弁が最小開度位置に戻されるとともに、吸気絞り弁１が全開位置に戻される。
なお、電動アクチュエータは、通電により回転出力を発生する電動モータ（例えば、ＤＣモータ）と、この電動モータの回転を減速して出力トルクを増大させる歯車減速装置とを組み合わせたものである。 The low pressure EGR valve body 4 unit is provided with a return spring for returning the low pressure EGR adjustment valve to the fully closed position and returning the intake throttle valve 1 to the fully opened position, and opening the valve body 4 of the intake throttle valve 1 to the maximum opening degree. A stopper member for stopping at is provided.
As a result, when the energization of the electric actuator is stopped (when the energization of the electric motor is stopped), the low pressure EGR adjustment valve is returned to the minimum opening position, and the intake throttle valve 1 is returned to the fully open position.
The electric actuator is a combination of an electric motor (for example, a DC motor) that generates a rotational output by energization and a gear reduction device that reduces the rotation of the electric motor to increase the output torque.

次に、本発明にかかる吸気絞り弁１の弁体４について詳細に説明する。
なお、以下では、弁体４のうち、最小開度時においてシャフト３より吸気上流側（エアクリーナ側）を上流弁部４ａと称し、最小開度時においてシャフト３より吸気下流側（エンジン側）を下流弁部４ｂと称する。 Next, the valve body 4 of the intake throttle valve 1 according to the present invention will be described in detail.
In the following, among the valve body 4, the intake upstream side (air cleaner side) from the shaft 3 at the minimum opening is referred to as the upstream valve portion 4 a, and the intake downstream side (engine side) from the shaft 3 at the minimum opening. This is referred to as the downstream valve portion 4b.

吸気絞り弁１は、吸気通路２ａを最大に絞った状態（最小開度時）であっても、図１（ｂ）に示すように、弁体４とハウジング２（吸気通路２ａの内壁）の間に環状の隙間αが設けられるものであり、最小開度時であっても隙間αを介して吸気が流れるように設けられている。このため、最小開度時には、弁体４に流速勾配が生じる。その結果、上流弁部４ａに加わる圧力Ｐ１が、下流弁部４ｂに加わる圧力Ｐ２より大きくなる（Ｐ１＞Ｐ２）。   As shown in FIG. 1B, the intake throttle valve 1 has a valve body 4 and a housing 2 (inner wall of the intake passage 2a) as shown in FIG. An annular gap α is provided between them, and the intake air flows through the gap α even at the minimum opening. For this reason, a flow velocity gradient is generated in the valve body 4 at the minimum opening. As a result, the pressure P1 applied to the upstream valve portion 4a becomes larger than the pressure P2 applied to the downstream valve portion 4b (P1> P2).

そこで、この実施例１では、上流弁部４ａの面積Ｓ１より、下流弁部４ｂの面積Ｓ２を大きく設けている（Ｓ１＜Ｓ２）。
なお、上流弁部４ａの面積Ｓ１とは、上流弁部４ａにおける吸気の受圧面積であり、上流弁部４ａの外縁とシャフト３で囲まれる面積である。
同様に、下流弁部４ｂの面積Ｓ２とは、下流弁部４ｂにおける吸気の受圧面積であり、下流弁部４ｂの外縁とシャフト３で囲まれる面積である。 Therefore, in the first embodiment, the area S2 of the downstream valve portion 4b is larger than the area S1 of the upstream valve portion 4a (S1 <S2).
The area S1 of the upstream valve portion 4a is an intake pressure receiving area in the upstream valve portion 4a, and is an area surrounded by the outer edge of the upstream valve portion 4a and the shaft 3.
Similarly, the area S2 of the downstream valve portion 4b is an intake pressure receiving area in the downstream valve portion 4b, and is an area surrounded by the outer edge of the downstream valve portion 4b and the shaft 3.

上流弁部４ａの面積Ｓ１より、下流弁部４ｂの面積Ｓ２を大きく設ける手段として、この実施例１では、図１（ａ）に示すように、シャフト３の軸方向から見た場合、上流弁部４ａの角度に対し、下流弁部４ｂの角度が異なって設けられる。
具体的には、最小開度時における上流弁部４ａより、最小開度時における下流弁部４ｂが、吸気下流側に傾いて設けられることで、上流弁部４ａの面積Ｓ１より下流弁部４ｂの面積Ｓ２が大きく設けられる。 As means for providing the area S2 of the downstream valve portion 4b larger than the area S1 of the upstream valve portion 4a, in the first embodiment, as shown in FIG. The angle of the downstream valve portion 4b is different from the angle of the portion 4a.
Specifically, the downstream valve portion 4b at the minimum opening degree is inclined to the intake downstream side from the upstream valve portion 4a at the minimum opening degree, so that the downstream valve portion 4b from the area S1 of the upstream valve portion 4a. Is provided with a large area S2.

上流弁部４ａの面積Ｓ１と下流弁部４ｂの面積Ｓ２の比率は、最小開度時において、上流弁部４ａが流速勾配によって受ける受動トルクＴ１（Ｔ１＝Ｓ１×Ｐ１）と、下流弁部４ｂが流速勾配によって受ける受動トルクＴ２（Ｔ２＝Ｓ２×Ｐ２）とが、略等しくなる比率に設けられる。
具体的にこの実施例１では、上流弁部４ａが受ける受動トルクＴ１と、下流弁部４ｂが受ける受動トルクＴ２とが略等しくなるように、最小開度時における下流弁部４ｂの傾きを従来技術（図３参照）よりも大きくして、下流弁部４ｂの面積Ｓ２を大きく設けるものである。 The ratio between the area S1 of the upstream valve portion 4a and the area S2 of the downstream valve portion 4b is such that the passive valve T1 (T1 = S1 × P1) received by the upstream valve portion 4a by the flow velocity gradient at the minimum opening degree and the downstream valve portion 4b. Is provided at a ratio that is approximately equal to the passive torque T2 (T2 = S2 × P2) received by the flow velocity gradient.
Specifically, in the first embodiment, the inclination of the downstream valve portion 4b at the minimum opening is conventionally set so that the passive torque T1 received by the upstream valve portion 4a and the passive torque T2 received by the downstream valve portion 4b are substantially equal. The area S2 of the downstream valve portion 4b is larger than that of the technique (see FIG. 3).

また、弁体４は、シャフト３の一部を平面に設けた取付面（平面）に固定される。一方、弁体４にも、シャフト３の取付面に合致する平坦部４ｃが設けられている。
この実施例１では、シャフト３の軸方向から見た場合、平坦部４ｃの角度が、「上流弁部４ａの傾斜角度」および「下流弁部４ｂの傾斜角度」とも異なって設けられるものであり、シャフト３の軸方向から見て弁体４が略Ｚ字形状を呈して設けられる。 Further, the valve body 4 is fixed to an attachment surface (plane) in which a part of the shaft 3 is provided on a plane. On the other hand, the valve body 4 is also provided with a flat portion 4 c that matches the mounting surface of the shaft 3.
In the first embodiment, when viewed from the axial direction of the shaft 3, the angle of the flat portion 4c is provided differently from the “inclination angle of the upstream valve portion 4a” and the “inclination angle of the downstream valve portion 4b”. The valve body 4 is provided in a substantially Z shape when viewed from the axial direction of the shaft 3.

（実施例１の効果１）
この実施例１の吸気絞り弁１は、上述したように、上流弁部４ａの面積Ｓ１より下流弁部４ｂの面積Ｓ２を大きく設けて、上流弁部４ａの受動トルクＴ１（Ｔ１＝Ｓ１×Ｐ１）と、下流弁部４ｂの受動トルクＴ２（Ｔ２＝Ｓ２×Ｐ２）とを、略等しく設けている。
これにより、流速勾配によってシャフト３に作用する回動トルクＴを略０（ゼロ）にできる（Ｔ＝Ｔ１−Ｔ２≒０）。即ち、最小開度時にシャフト３に作用する回動トルクＴをキャンセルすることができる。
このため、最小開度状態から弁体４を開弁させる際や、最小開度付近で弁体４をコントロールする際の回動負荷を低減することができ、電動アクチュエータおよびトルク伝達範囲（リンク装置等）の負荷を低減できる。 (Effect 1 of Example 1)
As described above, the intake throttle valve 1 of the first embodiment has the area S2 of the downstream valve portion 4b larger than the area S1 of the upstream valve portion 4a, and the passive torque T1 (T1 = S1 × P1) of the upstream valve portion 4a. ) And the passive torque T2 (T2 = S2 × P2) of the downstream valve portion 4b are substantially equal.
As a result, the rotational torque T acting on the shaft 3 can be made substantially 0 (zero) by the flow velocity gradient (T = T1−T2≈0). That is, the rotational torque T acting on the shaft 3 at the minimum opening can be canceled.
Therefore, when the valve body 4 is opened from the minimum opening state or when the valve body 4 is controlled in the vicinity of the minimum opening, the rotational load can be reduced, and the electric actuator and torque transmission range (link device) can be reduced. Etc.) can be reduced.

（実施例１の効果２）
この実施例１は、上述したように、シャフト３の軸方向から見た場合、上流弁部４ａの角度と下流弁部４ｂの角度が異なって設けられる。
具体的には、最小開度時における下流弁部４ｂを、上流弁部４ａより吸気下流側に傾けることで、上流弁部４ａの面積Ｓ１より下流弁部４ｂの面積Ｓ２を大きく設けている。
これにより、シャフト３の位置を従来技術（図３参照）と同じ位置に設けることができ、弁体４の形状変更のみで本発明を実施できる。 (Effect 2 of Example 1)
As described above, in the first embodiment, when viewed from the axial direction of the shaft 3, the angle of the upstream valve portion 4a and the angle of the downstream valve portion 4b are provided differently.
Specifically, the area S2 of the downstream valve part 4b is larger than the area S1 of the upstream valve part 4a by tilting the downstream valve part 4b at the minimum opening degree toward the intake downstream side of the upstream valve part 4a.
Thereby, the position of the shaft 3 can be provided at the same position as the prior art (see FIG. 3), and the present invention can be implemented only by changing the shape of the valve body 4.

（実施例１の効果３）
この実施例１は、上述したように、シャフト３の軸方向から見た場合、弁体４を略Ｚ字形状に設けている。具体的には、シャフト３の取付面に合致する平坦部４ｃを弁体４に設けている。
これにより、シャフト３に対する弁体４の位置決めが容易になり、シャフト３に対する弁体４の組付けを容易にすることができる。 (Effect 3 of Example 1)
In the first embodiment, as described above, when viewed from the axial direction of the shaft 3, the valve body 4 is provided in a substantially Z shape. Specifically, the valve body 4 is provided with a flat portion 4 c that matches the mounting surface of the shaft 3.
Thereby, positioning of the valve body 4 with respect to the shaft 3 becomes easy, and assembly of the valve body 4 with respect to the shaft 3 can be facilitated.

［実施例２］
図２を参照して実施例２を説明する。なお、この実施例２において上記実施例１と同一符合は同一機能物を示すものである。
この実施例２の吸気絞り弁１は、図２に示すように、弁体４に対するシャフト３の取付位置を上流側に偏らせて、上流弁部４ａの面積Ｓ１より、下流弁部４ｂの面積Ｓ２を大きく設けるものである。 [Example 2]
A second embodiment will be described with reference to FIG. In addition, in this Example 2, the same code | symbol as the said Example 1 shows the same function thing.
In the intake throttle valve 1 of the second embodiment, as shown in FIG. 2, the mounting position of the shaft 3 with respect to the valve body 4 is biased upstream, so that the area of the downstream valve part 4b is larger than the area S1 of the upstream valve part 4a. A large S2 is provided.

（実施例２の効果１）
この実施例２の吸気絞り弁１は、弁体４に対するシャフト３の取付位置を上流側に偏って設けることで、上流弁部４ａの面積Ｓ１より、下流弁部４ｂの面積Ｓ２が大きく設けられるため、上記実施例１と同様、最小開度時に流速勾配によってシャフト３に作用する回動トルクＴをキャンセルすることができる。 (Effect 1 of Example 2)
In the intake throttle valve 1 according to the second embodiment, the mounting position of the shaft 3 with respect to the valve body 4 is biased toward the upstream side so that the area S2 of the downstream valve portion 4b is larger than the area S1 of the upstream valve portion 4a. Therefore, as in the first embodiment, the rotational torque T acting on the shaft 3 by the flow velocity gradient at the minimum opening can be canceled.

（実施例２の効果２）
この実施例２では、弁体４に対するシャフト３の取付位置を上流側にズラすことで、上流弁部４ａの面積Ｓ１より、下流弁部４ｂの面積Ｓ２を大きく設けている。このため、弁体４を平板で設けることができる。 (Effect 2 of Example 2)
In the second embodiment, the area S2 of the downstream valve portion 4b is larger than the area S1 of the upstream valve portion 4a by shifting the mounting position of the shaft 3 with respect to the valve body 4 to the upstream side. For this reason, the valve body 4 can be provided in a flat plate.

上記の実施例では、吸気絞り弁１に本発明を適用する例を示したが、本発明は吸気絞り弁１に限定されるものではなく、最小開度時に弁体４が吸気通路２ａの流線方向に対して傾斜するタイプのバルブ装置に本発明を適用可能なものである。   In the above embodiment, the example in which the present invention is applied to the intake throttle valve 1 has been described. However, the present invention is not limited to the intake throttle valve 1, and the valve body 4 flows in the intake passage 2 a at the minimum opening. The present invention can be applied to a valve device that is inclined with respect to the linear direction.

上記の実施例では、最小開度時に流体（実施例では吸気）の一部が弁体４の上流から下流へ流れる例を示したが、最小開度時に流体通路を完全に閉じるバルブ装置に本発明を適用しても良い。具体的に、最小開度時に流体通路を完全に閉じるバルブ装置であっても、本発明を適用しない場合は、微少開度時に流速勾配による回動トルクＴがシャフト３に作用する。そこで、本発明を適用してシャフト３に作用する回動トルクＴをキャンセルするように設けても良い。   In the above embodiment, an example in which a part of the fluid (intake in the embodiment) flows from the upstream side to the downstream side of the valve body 4 at the minimum opening degree is shown. The invention may be applied. Specifically, even in the valve device that completely closes the fluid passage at the minimum opening degree, when the present invention is not applied, the rotational torque T due to the flow velocity gradient acts on the shaft 3 at the minute opening degree. Therefore, the present invention may be applied so as to cancel the rotational torque T acting on the shaft 3.

１ 吸気絞り弁（バルブ装置）
２ ハウジング
２ａ 吸気通路（流体通路）
３ シャフト
４ 弁体
４ａ 上流弁部
４ｂ 下流弁部 1 Intake throttle valve (valve device)
2 Housing 2a Intake passage (fluid passage)
3 Shaft 4 Valve body 4a Upstream valve section 4b Downstream valve section

Claims (5)

流体が通過可能な流体通路（２ａ）が形成されるハウジング（２）と、このハウジング（２）に対して回動自在に支持されるシャフト（３）と、このシャフト（３）と一体に回動して前記流体通路（２ａ）の開度調整を行う弁体（４）とを具備し、
最小開度時に前記弁体（４）が前記吸気通路（２ａ）の流線方向に対して傾斜するバルブ装置（１）において、
最小開度時における前記シャフト（３）より流体上流側の弁体（４）を上流弁部（４ａ）、最小開度時における前記シャフト（３）より流体下流側の弁体（４）を下流弁部（４ｂ）とした場合、前記弁体（４）は、前記上流弁部（４ａ）の面積（Ｓ１）より、前記下流弁部（４ｂ）の面積（Ｓ２）が、大きく設けられることを特徴とするバルブ装置（１）。 A housing (2) in which a fluid passage (2a) through which a fluid can pass is formed, a shaft (3) rotatably supported with respect to the housing (2), and a rotation integrally with the shaft (3). A valve body (4) that moves and adjusts the opening of the fluid passage (2a),
In the valve device (1) in which the valve body (4) is inclined with respect to the streamline direction of the intake passage (2a) at the minimum opening,
The valve body (4) upstream of the shaft (3) at the minimum opening is the upstream valve portion (4a), and the valve body (4) downstream of the shaft (3) at the minimum opening is downstream. In the case of the valve portion (4b), the valve body (4) has a larger area (S2) of the downstream valve portion (4b) than an area (S1) of the upstream valve portion (4a). Characteristic valve device (1). 請求項１に記載のバルブ装置（１）において、
前記シャフト（３）の軸方向から見た場合、前記上流弁部（４ａ）の角度と前記下流弁部（４ｂ）の角度が異なって設けられることで、前記上流弁部（４ａ）の面積（Ｓ１）より、前記下流弁部（４ｂ）の面積（Ｓ２）が、大きく設けられることを特徴とするバルブ装置（１）。 The valve device (1) according to claim 1,
When viewed from the axial direction of the shaft (3), the angle of the upstream valve portion (4a) is different from the angle of the downstream valve portion (4b), so that the area of the upstream valve portion (4a) ( The valve device (1) is characterized in that the area (S2) of the downstream valve portion (4b) is larger than that of S1). 請求項２に記載のバルブ装置（１）において、
前記シャフト（３）の軸方向から見た場合、前記弁体（４）における前記シャフト（３）の取付箇所の角度は、前記上流弁部（４ａ）の角度と異なるとともに、前記下流弁部（（４ｂ））の角度とも異なって設けられて、略Ｚ字形状を呈することを特徴とするバルブ装置（１）。 The valve device (1) according to claim 2,
When viewed from the axial direction of the shaft (3), the angle of the attachment location of the shaft (3) in the valve body (4) is different from the angle of the upstream valve portion (4a), and the downstream valve portion ( (4b)) The valve device (1) is provided differently from the angle and has a substantially Z-shape. 請求項１に記載のバルブ装置（１）において、
前記弁体（４）に対する前記シャフト（３）の取付位置が、上流側に偏って設けられることで、前記上流弁部（４ａ）の面積（Ｓ１）より、前記下流弁部（４ｂ）の面積（２）が、大きく設けられることを特徴とするバルブ装置（１）。 The valve device (1) according to claim 1,
The mounting position of the shaft (3) with respect to the valve body (4) is provided so as to be biased toward the upstream side, so that the area of the downstream valve part (4b) is larger than the area (S1) of the upstream valve part (4a). A valve device (1) characterized in that (2) is provided large. 請求項１〜請求項４のいずれかに記載のバルブ装置（１）において、
このバルブ装置（１）は、吸気が通過する吸気通路（２ａ）と、この吸気通路（２ａ）にＥＧＲガスを導く低圧ＥＧＲ流路との合流部に吸気負圧を発生させる吸気絞り弁であることを特徴とするバルブ装置（１）。 In the valve device (1) according to any one of claims 1 to 4,
The valve device (1) is an intake throttle valve that generates an intake negative pressure at a junction between an intake passage (2a) through which intake air passes and a low-pressure EGR passage that guides EGR gas to the intake passage (2a). A valve device (1) characterized by the above.
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