JP5265893B2 - Internal combustion engine injection pump and internal combustion engine - Google Patents

Internal combustion engine injection pump and internal combustion engine Download PDF

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JP5265893B2
JP5265893B2 JP2007203936A JP2007203936A JP5265893B2 JP 5265893 B2 JP5265893 B2 JP 5265893B2 JP 2007203936 A JP2007203936 A JP 2007203936A JP 2007203936 A JP2007203936 A JP 2007203936A JP 5265893 B2 JP5265893 B2 JP 5265893B2
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injection pump
frustoconical
axis
section
suction hole
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JP2008057530A (en
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シュロット クリストフ
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MAN B&W Diesel GmbH
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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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/38—Pumps characterised by adaptations to special uses or conditions

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Description

本発明は、請求項１の前文に記載の内燃機関の噴射ポンプ、即ち燃料噴射ポンプに関する。本発明は、請求項１０の前文に記載の内燃機関にも関する。   The present invention relates to an injection pump for an internal combustion engine, that is, a fuel injection pump according to the preamble of claim 1. The invention also relates to an internal combustion engine according to the preamble of claim 10.

内燃機関において実際に知られている傾斜切欠き（リード）制御式の高圧燃料噴射ポンプの場合、通常、プランジャが利用され、吸込み室並びに高圧室が高圧噴射ポンプのプランジャと協働する。噴射ポンプの吸込み室並びに高圧室は、通常、２個の吸込み孔を介して互いに接続され、高圧噴射ポンプのプランジャは、その第１位置で、吸込み孔を閉鎖し、かくして、吸込み室から高圧室への燃料流を阻止する。プランジャは第２位置で吸込み孔を開け、かくして、吸込み室からの燃料による高圧室の充填を可能とする。燃料は高圧ポンプの吸込み室に所謂前置搬送装置を介して到達し、吸込み室から吸込み孔を通して高圧室に到達し、詳しくは、噴射ポンプのプランジャの位置に関係して到達する。プランジャの位置はカムを介して制御される。プランジャが吸込み孔を閉じている場合、吸込み室から高圧室への燃料流は阻止され、燃料は高圧室内において、内燃機関のシリンダ内に所定圧力で噴射が行われるほどに圧縮される。プランジャの制御縁が吸込み孔を再び開け始めるや否や、噴射過程が終了し、そして、（プランジャの下降運動中）吸込み室から噴射ポンプの高圧室への燃料の搬送が行われる。   In the case of a high-pressure fuel injection pump of an inclination notch (lead) control type that is actually known in an internal combustion engine, a plunger is usually used, and the suction chamber and the high-pressure chamber cooperate with the plunger of the high-pressure injection pump. The suction chamber and the high-pressure chamber of the injection pump are usually connected to each other via two suction holes, and the plunger of the high-pressure injection pump closes the suction hole in its first position, and thus from the suction chamber to the high-pressure chamber. Block fuel flow to The plunger opens the suction hole at the second position, thus allowing the high pressure chamber to be filled with fuel from the suction chamber. The fuel reaches the suction chamber of the high-pressure pump through a so-called pre-conveying device, reaches the high-pressure chamber from the suction chamber through the suction hole, and specifically reaches the high-pressure chamber in relation to the position of the plunger of the injection pump. The position of the plunger is controlled via a cam. When the plunger closes the suction hole, the fuel flow from the suction chamber to the high-pressure chamber is blocked, and the fuel is compressed in the high-pressure chamber such that the fuel is injected at a predetermined pressure into the cylinder of the internal combustion engine. As soon as the plunger's control edge begins to reopen the suction hole, the injection process ends, and (during the downward movement of the plunger) fuel is transferred from the suction chamber to the high pressure chamber of the injection pump.

従って吸込み孔の範囲にかかる圧力は、激しく且つ衝撃的に変動し、このため吸込み孔の範囲にキャビテーションが生ずる。キャビテーションにより、吸込み孔の表面が腐食される。キャビテーションは噴射ポンプの点検間隔とその寿命に相当の影響を与える。   Therefore, the pressure applied to the suction hole range fluctuates violently and impactfully, and cavitation occurs in the suction hole range. The surface of the suction hole is corroded by cavitation. Cavitation has a considerable impact on the inspection interval and life of the injection pump.

この点から出発して、本発明の課題は、内燃機関の新規な噴射ポンプおよび相応した内燃機関を提供することにある。   Starting from this point, the object of the invention is to provide a new injection pump for an internal combustion engine and a corresponding internal combustion engine.

この課題は請求項１に記載の内燃機関の噴射ポンプによって解決される。本発明に基づいて、吸込み孔が高圧室に隣接して円筒状区域を有し、この円筒状区域に少なくとも２個の裁頭円錐状区域が連続して続き、この裁頭円錐状区域の軸線が、円筒状区域の軸線に対して水平方向および／又は垂直方向に曲げられないし傾斜している。   This problem is solved by the internal combustion engine injection pump according to claim 1. According to the invention, the suction hole has a cylindrical area adjacent to the high-pressure chamber, which is followed by at least two frustoconical areas, the axis of the frustoconical area. Are bent or inclined horizontally and / or vertically with respect to the axis of the cylindrical section.

吸込み室を高圧噴射プランジャポンプの高圧室に接続する吸込み孔の幾何学形状は、その表面がキャビテーション発生領域で絞り込まれているように形状ないし輪郭づけられ、その結果キャビテーション気泡の破裂が、吸込み孔の表面に悪影響を与えることなく、燃料内で直接行われる。吸込み孔の壁部へのキャビテーション気泡の付着を助長する鋭い縁や急傾斜角を防止できる。それに応じて、全体として高圧噴射プランジャポンプの吸込み孔のキャビテーション腐食を低減でき、この結果高圧噴射プランジャポンプは長い寿命を示し、点検時間間隔が増大する。このため大幅な経費節減が可能となる。   The geometry of the suction hole connecting the suction chamber to the high pressure chamber of the high pressure injection plunger pump is shaped or contoured so that its surface is squeezed in the cavitation generating region, so that the cavitation bubble bursts, This is done directly in the fuel without adversely affecting the surface of the fuel. It is possible to prevent sharp edges and steep inclination angles that promote adhesion of cavitation bubbles to the wall of the suction hole. Accordingly, cavitation corrosion of the suction hole of the high-pressure injection plunger pump as a whole can be reduced, and as a result, the high-pressure injection plunger pump exhibits a long life and an inspection time interval increases. As a result, significant cost savings are possible.

裁頭円錐状区域の軸線が、円筒状区域の軸線に対し水平並びに垂直方向に曲げられ又は傾斜し、その際裁頭円錐状区域の軸線が互いに一致する、即ち重なり合うとよい。   The axis of the frustoconical section may be bent or inclined horizontally and perpendicularly to the axis of the cylindrical section, with the axes of the frustoconical section being coincident with each other, ie overlapping.

本発明に基づく内燃機関を請求項１０に示す。   An internal combustion engine according to the present invention is shown in claim 10.

本発明の有利な実施態様は従属請求項および以下の説明から明らかにする。以下図を参照して本発明の実施例を詳細に説明するが、本発明はこの実施例に限定されない。   Advantageous embodiments of the invention emerge from the dependent claims and the following description. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the embodiments.

図１は、ディーゼルエンジンに対する所謂傾斜切欠き（リード）制御式の高圧噴射プランジャポンプの一部を断面図で示す。噴射ポンプはプランジャ１０を有し、該プランジャ１０は噴射ポンプの吸込み室１１並びに高圧室１２と協働する。代表的には、吸込み室１１を高圧室１２に２個の吸込み孔１３を介して接続する。なお、唯一の又は２個以上の吸込み孔１３を設けてもよい。プランジャ１０の位置に応じ、プランジャ１０は吸込み孔１３を開閉する。プランジャ１０が吸込み孔１３を閉鎖している際（プランジャ１０の最大上昇行程時）、噴射ポンプの吸込み室１１から高圧室１２への燃料流を阻止する。   FIG. 1 is a sectional view showing a part of a so-called inclined notch (lead) control type high-pressure injection plunger pump for a diesel engine. The injection pump has a plunger 10 which cooperates with a suction chamber 11 and a high pressure chamber 12 of the injection pump. Typically, the suction chamber 11 is connected to the high-pressure chamber 12 through two suction holes 13. Only one or two or more suction holes 13 may be provided. The plunger 10 opens and closes the suction hole 13 according to the position of the plunger 10. When the plunger 10 closes the suction hole 13 (during the maximum ascending stroke of the plunger 10), the fuel flow from the suction chamber 11 to the high pressure chamber 12 of the injection pump is blocked.

これに対しプランジャ１０が吸込み孔１３を開け、高圧室１２に吸込み室１１より低い圧力がかかったとき、吸込み孔１３を通して燃料が流れ、高圧室１２が噴射ポンプの吸込み室１１からの燃料で充填される。   On the other hand, when the plunger 10 opens the suction hole 13 and a pressure lower than that of the suction chamber 11 is applied to the high pressure chamber 12, the fuel flows through the suction hole 13, and the high pressure chamber 12 is filled with fuel from the suction chamber 11 of the injection pump. Is done.

高圧室１２内の圧縮された燃料を内燃機関、特にディーゼルエンジンのシリンダに注入するために、図示しない燃料噴射ノズルが、（高圧）通路１４を介して高圧燃料噴射プランジャポンプの高圧室１２に接続される。   A fuel injection nozzle (not shown) is connected to the high pressure chamber 12 of the high pressure fuel injection plunger pump via a (high pressure) passage 14 in order to inject the compressed fuel in the high pressure chamber 12 into the cylinder of an internal combustion engine, in particular a diesel engine. Is done.

吸込み孔１３は主に２つの部分、即ち吸込み室１１に隣接した入口部１６と、高圧室１２に隣接した出口部１５に分けられる。本発明では、各吸込み孔１３の吸込み室１１に隣接する入口部１６は、吸込み孔１３が殆どキャビテーション腐食を被らないよう輪郭づけている。即ち、吸込み孔１３の入口部１６を、吸込み孔の表面がキャビテーション発生領域で拡がり又は狭まるように形状づけ、もって最終的にキャビテーション気泡の破裂が、吸込み孔１３に有害な影響を与えることなしに、燃料内で直接生ずるようにしている。   The suction hole 13 is mainly divided into two parts, that is, an inlet part 16 adjacent to the suction chamber 11 and an outlet part 15 adjacent to the high-pressure chamber 12. In the present invention, the inlet portion 16 adjacent to the suction chamber 11 of each suction hole 13 is contoured so that the suction hole 13 is hardly subjected to cavitation corrosion. That is, the inlet portion 16 of the suction hole 13 is shaped so that the surface of the suction hole expands or narrows in the cavitation generation region, so that the rupture of the cavitation bubble does not adversely affect the suction hole 13 in the end. , Which occurs directly in the fuel.

図１において各吸込み孔１３の出口部１５は円筒状区域１７として形成され、各吸込み孔１３の円筒状区域１７の軸線には符号１８を付している。各吸込み孔１３の入口部１６は、図１において２個の裁頭円錐状区域１９、２０で形成されている。入口部１６の第１裁頭円錐状区域１９は、出口部１５の円筒状区域１７に直接続き、第２裁頭円錐状区域２０は第１裁頭円錐状区域１９に続き、吸込み室１１に開口している。   In FIG. 1, the outlet 15 of each suction hole 13 is formed as a cylindrical area 17, and the axis of the cylindrical area 17 of each suction hole 13 is denoted by reference numeral 18. The inlet 16 of each suction hole 13 is formed by two frustoconical sections 19 and 20 in FIG. The first frustoconical area 19 of the inlet part 16 continues directly to the cylindrical area 17 of the outlet part 15, and the second frustoconical area 20 continues to the first frustoconical area 19, into the suction chamber 11. It is open.

本発明に従い、入口部１６の第１裁頭円錐状区域１９、２０の軸線は、出口部１５の円筒状区域１７に対し水平方向および／又は垂直方向に曲げられないし傾斜し、図示の実施例では、裁頭円錐状区域１９、２０の軸線は円筒状区域１７の軸線１８に対して水平方向および垂直方向に曲げられないし傾斜している。図示の実施例において、裁頭円錐状区域１８、１９の軸線は互いに一致し、即ち重なり合っている。両裁頭円錐状区域１９、２０の軸線は図１において符号２１で示す。   In accordance with the present invention, the axis of the first frustoconical section 19, 20 of the inlet section 16 is bent or inclined in the horizontal and / or vertical direction with respect to the cylindrical section 17 of the outlet section 15 in the illustrated embodiment. The axis of the frustoconical sections 19, 20 is bent or inclined in the horizontal and vertical directions with respect to the axis 18 of the cylindrical section 17. In the embodiment shown, the axes of the frustoconical sections 18, 19 coincide with one another, i.e. overlap. The axis of both frustoconical sections 19, 20 is indicated by reference numeral 21 in FIG.

図１と図２に応じて、入口部１６の両裁頭円錐状区域１９、２０の一致軸線２１は、出口部１５の円筒状区域１７の軸線１８に対し水平方向に左側に角度γだけ、垂直方向に上向きに角度δだけ曲げられないし傾斜している。これら角度γ、δは異なるとよいが、同じ大きさでもよい。また裁頭円錐状区域の軸線を円筒状区域に対し水平方向に右側に向かって、垂直方向に下向きに曲げないし傾斜させてもよい。   According to FIGS. 1 and 2, the coincidence axis 21 of both frustoconical sections 19, 20 of the inlet section 16 has an angle γ on the left side in the horizontal direction with respect to the axis 18 of the cylindrical section 17 of the outlet section 15, It is bent or inclined by an angle δ upward in the vertical direction. These angles γ and δ may be different, but may be the same size. Further, the axis of the truncated conical section may be bent or inclined to the right in the horizontal direction and downward in the vertical direction with respect to the cylindrical section.

図１に応じて、各吸込み孔１３の第１裁頭円錐状区域１９は円錐半角αにより、各吸込み孔１３の第２裁頭円錐状区域２０は円錐半角βにより各々特徴づけられている。図１の実施例では、第１裁頭円錐状区域１９の円錐半角αは、各吸込み孔１３の第２裁頭円錐状区域２０の円錐半角βより大きい。しかし他の例では、第１裁頭円錐状区域１９の円錐半角αを各吸込み孔１３の第２裁頭円錐状区域２０の円錐半角βよりも小さくなし得る。   According to FIG. 1, the first frustoconical area 19 of each suction hole 13 is characterized by a conical half angle α and the second frustoconical area 20 of each suction hole 13 is characterized by a conical half angle β. In the embodiment of FIG. 1, the cone half angle α of the first frustoconical section 19 is greater than the cone half angle β of the second frustoconical section 20 of each suction hole 13. However, in another example, the conical half angle α of the first frustoconical section 19 can be made smaller than the conical half angle β of the second conical section 20 of each suction hole 13.

内燃機関の本発明に基づく噴射ポンプの概略断面図。1 is a schematic sectional view of an injection pump according to the present invention of an internal combustion engine. 図１の矢印ＩＩの方向から見た本発明に基づく噴射ポンプの概略側面図。The schematic side view of the injection pump based on this invention seen from the direction of arrow II of FIG.

符号の説明Explanation of symbols

１０ プランジャ、１１ 吸込み室、１２ 高圧室、１３ 吸込み孔、１４ 通路、１５ 出口部、１６ 入口部、１７ 円筒状区域、１８、２１ 軸線、１９、２０ 裁頭円錐状区域 10 Plunger, 11 Suction chamber, 12 High pressure chamber, 13 Suction hole, 14 Passage, 15 Outlet, 16 Inlet, 17 Cylindrical section, 18, 21 Axis, 19, 20 Triangular conical section

Claims (8)

少なくとも１個のプランジャ（１０）を備え、特に２個の吸込み孔（１３）を介して互いに接続される吸込み室（１１）と高圧室（１２）が、プランジャ（１０）が吸込み孔（１３）を閉鎖した際に、吸込み室（１１）から高圧室（１２）への燃料流を阻止し、プランジャ（１０）が吸込み孔（１３）を開いた際に、吸込み室（１１）からの燃料による高圧室（１２）の充填を可能とするように、前記プランジャ（１０）と協働する傾斜切欠き制御式の噴射ポンプにおいて、
吸込み孔（１３）が高圧室（１２）に隣接して円筒状区域（１７）を有し、該円筒状区域（１７）に少なくとも２個の裁頭円錐状区域（１９、２０）が連続して続き、該裁頭円錐状区域（１９、２０）の軸線（２１）が、円筒状区域（１７）の軸線（１８）に対して水平方向および垂直方向の少なくとも一方向に曲げられ、
吸込み孔（１３）が２個の裁頭円錐状区域（１９、２０）を有し、円筒状区域（１７）に直接続く第１裁頭円錐状区域（１９）が第１円錐半角（α）を有し、第１裁頭円錐状区域（１９）に続き吸込み室（１１）に開口する第２裁頭円錐状区域（２０）が第２円錐半角（β）を有し、
第１円錐半角（α）が第２円錐半角（β）より大きいことを特徴とする内燃機関の噴射ポンプ。 The suction chamber (11) and the high-pressure chamber (12), which are provided with at least one plunger (10) and are connected to each other via two suction holes (13), in particular, the plunger (10) is the suction hole (13). When the plunger is closed, the fuel flow from the suction chamber (11) to the high pressure chamber (12) is blocked, and the fuel from the suction chamber (11) is opened when the plunger (10) opens the suction hole (13). In an inclined notch controlled injection pump cooperating with the plunger (10) so as to allow filling of the high pressure chamber (12) by
The suction hole (13) has a cylindrical section (17) adjacent to the high-pressure chamber (12), and at least two frustoconical sections (19, 20) are connected to the cylindrical section (17). Subsequently, the axis (21) of the frustoconical section (19, 20) is bent in at least one direction , horizontal and vertical, with respect to the axis (18) of the cylindrical section (17) ,
The suction hole (13) has two frustoconical sections (19, 20), the first frustoconical section (19) directly following the cylindrical section (17) is the first conical half angle (α) A second frustoconical area (20) opening into the suction chamber (11) following the first frustoconical area (19) has a second conical half angle (β);
An injection pump for an internal combustion engine, wherein the first conical half angle (α) is larger than the second conical half angle (β) . 裁頭円錐状区域（１９、２０）の軸線（２１）が、円筒状区域（１７）の軸線（１８）に対して水平方向および垂直方向に曲げられていることを特徴とする請求項１記載の噴射ポンプ。 2. The axis (21) of the frustoconical section (19, 20) is bent horizontally and vertically with respect to the axis (18) of the cylindrical section (17). Injection pump. 裁頭円錐状区域（１９、２０）の軸線（２１）が、円筒状区域（１７）の軸線（１８）に対して、水平方向に第１角度（γ）だけ、および垂直方向に第２角度（δ）だけ曲げられていることを特徴とする請求項２記載の噴射ポンプ。 The axis (21) of the frustoconical section (19, 20) is a first angle (γ) in the horizontal direction and a second angle in the vertical direction with respect to the axis (18) of the cylindrical section (17). The injection pump according to claim 2, wherein the injection pump is bent by (δ). 裁頭円錐状区域（１９、２０）の軸線（２１）が、円筒状区域（１７）の軸線（１８）に対して、水平方向に左或いは右に曲げられていることを特徴とする請求項１から３の１つに記載の噴射ポンプ。 The axis (21) of the frustoconical section (19, 20) is bent horizontally to the left or right with respect to the axis (18) of the cylindrical section (17). The injection pump according to one of 1 to 3. 裁頭円錐状区域（１９、２０）の軸線（２１）が、円筒状区域（１７）の軸線（１８）に対して、垂直方向に上向き或いは下向きに曲げられていることを特徴とする請求項１から４の１つに記載の噴射ポンプ。 The axis (21) of the frustoconical section (19, 20) is bent vertically upward or downward with respect to the axis (18) of the cylindrical section (17). The injection pump according to one of 1 to 4. 裁頭円錐状区域（１９、２０）の軸線（２１）が互いに一致ないし重なり合っていることを特徴とする請求項１から５の１つに記載の噴射ポンプ。   6. An injection pump according to claim 1, wherein the axes (21) of the frustoconical areas (19, 20) coincide or overlap one another. 裁頭円錐状区域（１９、２０）が吸込み孔（１３）の入口部（１６）を形成し、円筒状区域（１７）が吸込み孔（１３）の出口部（１５）を形成することを特徴とする請求項１から６の１つに記載の噴射ポンプ。 The frustoconical section (19, 20) forms the inlet part (16) of the suction hole (13) and the cylindrical section (17) forms the outlet part (15) of the suction hole (13). An injection pump according to one of claims 1 to 6 . 複数のシリンダを備え、各シリンダに所定の噴射圧で燃料を注入するために、各シリンダに噴射ポンプが付属した内燃機関において、噴射ポンプが請求項１から７の１つに記載に応じて形成されたことを特徴とする内燃機関。

8. An internal combustion engine comprising a plurality of cylinders, each of which is provided with an injection pump for injecting fuel at a predetermined injection pressure, wherein the injection pump is formed according to one of claims 1 to 7. An internal combustion engine characterized by that.

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DE102006040465A DE102006040465A1 (en) 2006-08-29 2006-08-29 Injection pump i.e. chamfer-controlled piston high pressure fuel injection pump, for diesel -internal-combustion engine, has chambers connected with each other with piston such that piston is locked in position of suction borehole

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DE3141653A1 (en) * 1981-10-21 1983-05-05 L'Orange GmbH, 7000 Stuttgart FUEL INJECTION PUMP, ESPECIALLY FOR A DIESEL INTERNAL COMBUSTION ENGINE
AT388214B (en) * 1983-02-17 1989-05-26 Steyr Daimler Puch Ag FUEL INJECTION UNIT FOR ONE CYLINDER OF A DIESEL ENGINE
IT1200685B (en) * 1985-07-22 1989-01-27 Piaggio & C Spa MECHANICAL FUEL INJECTION PUMP, IN PARTICULAR INTERNAL COMBUSTION COMBUSTION IGNITION PUMPS
DE3902764C2 (en) * 1989-01-31 2002-10-17 Bosch Gmbh Robert Fuel injection pump
DE4240302A1 (en) * 1992-12-01 1994-06-09 Bosch Gmbh Robert Pressure valve for IC engine - with throttle located in area of reduced cross=section of passage channel
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