EP0175070B1 - System for limiting the dynamic pressure in an exhaust brake - Google Patents

System for limiting the dynamic pressure in an exhaust brake Download PDF

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Publication number
EP0175070B1
EP0175070B1 EP19850107939 EP85107939A EP0175070B1 EP 0175070 B1 EP0175070 B1 EP 0175070B1 EP 19850107939 EP19850107939 EP 19850107939 EP 85107939 A EP85107939 A EP 85107939A EP 0175070 B1 EP0175070 B1 EP 0175070B1
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EP
European Patent Office
Prior art keywords
valve
exhaust pipe
valve body
closed position
throttle valve
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Expired
Application number
EP19850107939
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German (de)
French (fr)
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EP0175070A1 (en
Inventor
Alfred Schmidt
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Individual
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Individual
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Priority to AT85107939T priority Critical patent/ATE31780T1/en
Publication of EP0175070A1 publication Critical patent/EP0175070A1/en
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Publication of EP0175070B1 publication Critical patent/EP0175070B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/04—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning exhaust conduits
    • F02D9/06—Exhaust brakes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/87265—Dividing into parallel flow paths with recombining
    • Y10T137/87523—Rotary valve
    • Y10T137/87531—Butterfly valve

Definitions

  • the invention relates to a device for limiting the dynamic pressure of an exhaust engine brake, in which a throttle valve is rotatable in an exhaust pipe from an open position to a closed position and is supported on both sides, and a recess is provided that passes through the throttle valve in the closed position and is a valve bore provided in the exhaust pipe. which is arranged on the end face of the throttle valve in the closed position and projects beyond the throttle valve end face on both sides by at least 1/5 of the diameter of the valve bore, and in which a valve body which is displaceable in the valve bore is urged into the closed position by means of a spring which is spaced from Exhaust pipe is arranged.
  • the cross section of the exhaust pipe and the throttle valve are substantially rectangular and the throttle valve is in the closed position in a plane perpendicular to the central axis of the exhaust pipe.
  • the valve bore is arranged so that the end face of the throttle valve is arranged in its closed position and in its open position in the valve bore or the valve body, the end face of the valve body being flat, adapted to the flatness of the inner surface of the exhaust pipe.
  • the point at which the throttle valve which is in the closed position and the valve body pressed forward by the spring cooperate with the bearing of the throttle valve.
  • the bearing is provided in the region of the valve body.
  • the cross-section of the exhaust pipe is round, the throttle valve is elliptical and the throttle valve is in a slightly inclined position in relation to a plane perpendicular to the central axis of the exhaust pipe.
  • the object of the invention is therefore to create a less complex device of the type mentioned, which takes into account the conditions of an engine brake and the properties desired by an engine brake only when a predetermined upper dynamic pressure limit is reached.
  • the device according to the invention solving this problem, is characterized in that the cross section of the exhaust pipe is round, the throttle valve is elliptical and the throttle valve is in a slightly inclined position relative to a plane perpendicular to the center line of the exhaust pipe, and the valve bore is arranged in this way is that the end face of the throttle valve is arranged only in its closed position in the valve bore or the valve body, the end face of the valve body being curved to match the curvature of the inner surface of the exhaust pipe.
  • the point at which the throttle valve in the closed position and the valve piston pressed forward by the spring cooperate is provided with an axial and circumferential distance from the pivot axis.
  • the valve bore and valve body are arranged apart from the pivot axis of the throttle valve and the end face of the valve body has a non-planar, curved shape adapted to the round exhaust pipe. The device thus operates quietly and regardless of the temperature of the exhaust pipe.
  • valve bore or the valve body projects beyond the throttle valve face on both sides by at least a quarter of the diameter.
  • An increase in the protrusion does not only result in an increase in the passage cross section. Since the pressure that opens the valve only acts on one protruding area of the valve body and the spring force should not be set too low because of the desired robustness, a considerable or increased size of the protruding area of the valve body is desirable.
  • the spring has an increasing spring characteristic within the specified stroke of the valve body.
  • the valve body does not open completely every time the specified upper dynamic pressure limit is exceeded, but continues to open as it is exceeded. Since the spring is associated with an increase in compression due to an increase in compression, the valve is only opened slightly when the upper dynamic pressure limit is slightly exceeded.
  • the compression spring is e.g. a gas pressure spring; as a rule, however, a mechanical spring is used for simplicity. Although all suitable mechanical springs can be used, a helical spring is generally used for simplicity.
  • valve bore and valve body are arranged at a distance from the lowest area of the exhaust pipe, preferably in the uppermost area. This reduces or prevents the ingress of condensed water into the valve.
  • a gas-tight cap is connected to the valve bore, in which a pressure disk supporting the spring is displaceably guided, and the space between the valve body in the closed position and the turntable is connected via a relief channel the exhaust pipe is connected behind the throttle valve in the closed position. Since there must be considerable play between the valve body and the valve bore, gas penetrates behind the valve body under pressure. This gas can then flow out when the valve body is in the closed position.
  • the end face of the valve body adapted to the curvature of the inner surface of the exhaust pipe, is curved like a groove and the valve body is secured against rotation about its own axis.
  • the valve body is designed and arranged such that it can rotate in the valve bore and the end face of the valve body is hollowed out in the shape of a spherical shell, the radius of the spherical shell is adapted to the inner radius of the exhaust pipe. The valve body is now allowed to rotate around its central axis and there are no anti-rotation sliding guides.
  • the throttle valve is pivoted; with rotatable bearings e.g. stops in the exhaust pipe provided for the closed position; the elliptical design of the rotatably mounted throttle valve is essential.
  • the throttle valve When closed, the throttle valve has air along its circumference or sufficient play with respect to the exhaust pipe.
  • the path of the valve body is limited at the front by a stop in order to prevent the valve body from penetrating into the interior of the exhaust pipe.
  • the path of the valve body is also limited towards the rear by a stop, since from a certain opening stroke the passage cross section of the valve bore between the two sides of the throttle valve no longer increases.
  • a piece of an exhaust pipe 1 with a circular cross section is provided, in which a throttle valve 2 is arranged so as to be pivotable about an axis 3, which is located in the middle at half the height of the inside diameter of the exhaust pipe.
  • the throttle valve 2 is elliptical in shape and, as can be seen in FIGS. 1, 2 and 4, is in a slightly inclined position when it is in the closed position.
  • the throttle valve 2 turns a circumferential end face 4 in the closed position of the inside of the exhaust pipe 1.
  • the throttle valve 2 is pivoted from the closed position shown in dashed lines in FIG. 4 into a horizontal open position and back via a crank mechanism 5 by means of a piston-cylinder device 6.
  • a valve housing 7 is provided, which extends to the wall of the exhaust pipe and covers it to the outside.
  • the valve housing 7 forms a valve bore 8, which is circular in cross section and tapers on the side facing the interior of the exhaust pipe 1, thus forming an inner stop 9.
  • the valve bore 8 receives a valve body 10, which widens in the direction from the inside to the outside and rests in the closed position on the stop 9 of the valve housing.
  • the valve body 10 has a spherical shell-shaped end face 11 facing the interior of the exhaust pipe and extends beyond the end face 4 of the throttle valve 2 on both sides with a considerable area, as seen in the axial direction of the exhaust pipe 1.
  • the valve body 10 carries an elongated stamp 12 on the back, which protrudes into a cap 13.
  • This cap 13 is attached to the valve housing 7 and secured there by means of a snap ring.
  • a front bent end strip of the cap forms a rear stop 14 for the valve body 10, which limits the back and forth movement of the valve body.
  • a thrust washer 15 is provided which is slidably guided in the cylindrical cap 13.
  • a relief duct 16 with a large cross section opens into the exhaust pipe 1, which opens into the valve bore 8 such that it is only partially closed by the valve body 10 when the valve body 10 is in the advanced position, i.e. that it is partially open and that, according to FIG. 2, it is at least partially open even when the valve body is completely pushed back, i.e. is only partially blocked by the valve body.
  • a helical spring 17 made of wire which is supported on the outside at the bottom of the cap.
  • the support is provided via an adjusting device 18, which need not be provided.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
  • Exhaust Silencers (AREA)
  • Motor Or Generator Frames (AREA)
  • Motor Or Generator Cooling System (AREA)

Abstract

A pressure relief device for a throttle-type engine exhaust suppressor comprises a valve bore opening into the exhaust pipe in the region of an end face of the throttle valve when the throttle valve is in closed position. The valve bore incorporates a spring loaded valve poppet. When a predetermined back pressure is established in the exhaust pipe, the valve poppet opens against the spring pressure and provides a bypass around the throttle valve.

Description

Die Erfindung betrifft eine Einrichtung zur Begrenzung des Staudruckes einer Auspuffmotorbremse, bei der in einem Auspuffrohr eine Drosselklappe von einer Offenstellung in eine Geschlossenstellung drehbar und beiderseits gelagert ist und eine die in Geschlossenstellung befindliche Drosselklappe passierende Ausnehmung vorgesehen ist, die eine im Auspuffrohr vorgesehene Ventilbohrung ist, die bei der Stirnfläche der in Geschlossenstellung befindlichen Drosselklappe angeordnet ist und die Drosselklappe-Stirnfläche beiderseits um mindestens 1/5 des Durchmessers der Ventilbohrung überragt, und bei der ein in der Ventilbohrung verschieblicher Ventilkörper in die Schliessstellung mittels einer Feder gedrängt ist, die mit Abstand vom Auspuffrohr angeordnet ist.The invention relates to a device for limiting the dynamic pressure of an exhaust engine brake, in which a throttle valve is rotatable in an exhaust pipe from an open position to a closed position and is supported on both sides, and a recess is provided that passes through the throttle valve in the closed position and is a valve bore provided in the exhaust pipe. which is arranged on the end face of the throttle valve in the closed position and projects beyond the throttle valve end face on both sides by at least 1/5 of the diameter of the valve bore, and in which a valve body which is displaceable in the valve bore is urged into the closed position by means of a spring which is spaced from Exhaust pipe is arranged.

Bei einer bekannten (GB-A-2 063 998) Einrichtung dieser Art sind der Querschnitt des Auspuffrohres und die Drosselklappe im wesentlichen rechtekkig und befindet sich die Drosselklappe bei Geschlossenstellung in einer zur Auspuffrohr-Mittelachse rechtwinkeligen Ebene. Die Ventilbohrung ist so angeordnet, dass die Stirnfläche der Drosselklappe bei deren Geschlossenstellung sowie bei deren Offenstellung bei der Ventilbohrung bzw. dem Ventilkörper angeordnet ist, wobei die Stirnfläche des Ventilkörpers angepasst an die Ebenheit der Innenfläche des Auspuffrohres eben ist. Diejenige Stelle, an der die in Schliessstellung befindliche Drosselklappe und der von der Feder nach vorne gedrückte Ventilkörper zusammenwirken, ist mit der Lagerung der Drosselklappe verquickt. Auch bei einer weiteren bekannten (DE-B-1 555 833) Einrichtung zur Begrenzung ist die Lagerung im Bereich des Ventilkörpers vorgesehen. Der Querschnitt des Auspuffrohres ist rund, die Drosselklappe ist elliptisch und die Drosselklappe ist bei Geschlossenstellung in einer leichten Schräglage, bezogen auf eine zur Auspuffrohr-Mittelachse rechtwinkelige Ebene.In a known (GB-A-2 063 998) device of this type, the cross section of the exhaust pipe and the throttle valve are substantially rectangular and the throttle valve is in the closed position in a plane perpendicular to the central axis of the exhaust pipe. The valve bore is arranged so that the end face of the throttle valve is arranged in its closed position and in its open position in the valve bore or the valve body, the end face of the valve body being flat, adapted to the flatness of the inner surface of the exhaust pipe. The point at which the throttle valve which is in the closed position and the valve body pressed forward by the spring cooperate with the bearing of the throttle valve. In another known (DE-B-1 555 833) limiting device, the bearing is provided in the region of the valve body. The cross-section of the exhaust pipe is round, the throttle valve is elliptical and the throttle valve is in a slightly inclined position in relation to a plane perpendicular to the central axis of the exhaust pipe.

Aufgabe der Erfindung ist es daher, eine wenig aufwendige Einrichtung der eingangs genannten Art zu schaffen, welche unter Berücksichtigung der Gegebenheiten einer Motorbremse und der von einer Motorbremse gewünschten Eigenschaften erst bei Erreichen einer vorgegebenen oberen Staudruckgrenze wirksam wird.The object of the invention is therefore to create a less complex device of the type mentioned, which takes into account the conditions of an engine brake and the properties desired by an engine brake only when a predetermined upper dynamic pressure limit is reached.

Die erfindungsgemässe Einrichtung ist, diese Aufgabe lösend, dadurch gekennzeichnet, dass der Querschnitt des Auspuffrohres rund, die Drosselklappe elliptisch und die Drosselklappe bei Geschlossenstellung in einer leichten Schräglage, bezogen auf eine zur Auspuffrohr-Mittelachse rechtwinkelige Ebene, ist, sowie dass die Ventilbohrung so angeordnet ist, dass die Stirnfläche der Drosselklappe nur bei deren Geschlossenstellung bei der Ventilbohrung bzw. dem Ventilkörper angeordnet ist, wobei die Stirnfläche des Ventilkörpers angepasst an die Krümmung der Innenfläche des Auspuffrohres gekrümmt ist.The device according to the invention, solving this problem, is characterized in that the cross section of the exhaust pipe is round, the throttle valve is elliptical and the throttle valve is in a slightly inclined position relative to a plane perpendicular to the center line of the exhaust pipe, and the valve bore is arranged in this way is that the end face of the throttle valve is arranged only in its closed position in the valve bore or the valve body, the end face of the valve body being curved to match the curvature of the inner surface of the exhaust pipe.

Die Stelle, an der die in Schliessstellung befindliche Drosselklappe und der von der Feder nach vorne gedrückte Ventilkolben zusammenwirken, ist mit axialem und umfangsmässigem Abstand von der Schwenkachse vorgesehen. Ventilbohrung und Ventilkörper sind abseits von der Schwenkachse der Drosselklappe angeordnet und die Stirnfläche des Ventilkörpers weist eine nicht plane, dem runden Auspuffrohr angepasste gekrümmte Gestalt auf. Die Einrichtung arbeitet also geräuscharm und unabhängig von der Temperatur des Abgasrohres.The point at which the throttle valve in the closed position and the valve piston pressed forward by the spring cooperate is provided with an axial and circumferential distance from the pivot axis. The valve bore and valve body are arranged apart from the pivot axis of the throttle valve and the end face of the valve body has a non-planar, curved shape adapted to the round exhaust pipe. The device thus operates quietly and regardless of the temperature of the exhaust pipe.

Besonders zweckmässig und vorteilhaft ist, wenn die Ventilbohrung bzw. der Ventilkörper die Drosselklappe-Stirnfläche beiderseits um mindestens ein Viertel des Durchmessers überragt. Eine Vergrösserung des Überragens ergibt nicht nur eine Vergrösserung des Durchlass-Querschnittes. Da der das Ventil öffnende Druck nur auf den einen überragenden Bereich des Ventilkörpers wirkt und die Federkraft der erwünschten Robustheit wegen nicht zu niedrig anzusetzen ist, ist eine erhebliche bzw. gesteigerte Grösse des überragenden Bereiches des Ventilkörpers erwünscht.It is particularly expedient and advantageous if the valve bore or the valve body projects beyond the throttle valve face on both sides by at least a quarter of the diameter. An increase in the protrusion does not only result in an increase in the passage cross section. Since the pressure that opens the valve only acts on one protruding area of the valve body and the spring force should not be set too low because of the desired robustness, a considerable or increased size of the protruding area of the valve body is desirable.

Besonders zweckmässig und vorteilhaft ist es auch, wenn die Feder im Rahmen des festgelegten Hubweges des Ventilkörpers eine ansteigende Federkennlinie aufweist. Der Ventilkörper öffnet also nicht bei jedem Überschreiten der festgelegten oberen Staudruckgrenze gleich vollständig, sondern mit wachsendem Überschreiten weiter. Da bei der Feder mit einer Kompressionszunahme ein Kraftanstieg verbunden ist, wird das Ventil bei einem geringen Überschreiten der oberen Staudruckgrenze nur wenig geöffnet.It is also particularly expedient and advantageous if the spring has an increasing spring characteristic within the specified stroke of the valve body. The valve body does not open completely every time the specified upper dynamic pressure limit is exceeded, but continues to open as it is exceeded. Since the spring is associated with an increase in compression due to an increase in compression, the valve is only opened slightly when the upper dynamic pressure limit is slightly exceeded.

Die Druckfeder ist z.B. eine Gasdruckfeder; in der Regel wird aber der Einfachheit wegen eine mechanische Feder verwendet. Obzwar alle geeigneten mechanischen Federn einsetzbar sind, wird in der Regel der Einfachheit wegen eine Wendelfeder verwendet.The compression spring is e.g. a gas pressure spring; as a rule, however, a mechanical spring is used for simplicity. Although all suitable mechanical springs can be used, a helical spring is generally used for simplicity.

Besonders zweckmässig und vorteilhaft ist es noch, wenn Ventilbohrung und Ventilkörper mit Abstand vom untersten Bereich des Auspuffrohres, vorzugsweise in dessen obersten Bereich, angeordnet sind. Hierdurch wird das Eindringen von Kondenswasser in das Ventil vermindert bzw. verhindert.It is particularly expedient and advantageous if the valve bore and valve body are arranged at a distance from the lowest area of the exhaust pipe, preferably in the uppermost area. This reduces or prevents the ingress of condensed water into the valve.

Besonders zweckmässig und vorteilhaft ist es auch, wenn sich hinter dem Ventilkörper an die Ventilbohrung eine an sich gasdichte Kappe anschliesst, in der eine die Feder abstützende Druckscheibe verschiebbar geführt ist, und der Raum zwischen dem in Schliessstellung befindlichen Ventilkörper und der Drehscheibe über einen Entlastungskanal an das Auspuffrohr hinter der in Geschlossenstellung befindlichen Drosselklappe angeschlossen ist. Da zwischen Ventilkörper und Ventilbohrung ein beachtliches Spiel vorhanden sein muss, dringt Gas unter Druck hinter den Ventilkörper. Dieses Gas kann dann abströmen, wenn sich der Ventilkörper in Geschlossenstellung befindet.It is also particularly expedient and advantageous if, behind the valve body, a gas-tight cap is connected to the valve bore, in which a pressure disk supporting the spring is displaceably guided, and the space between the valve body in the closed position and the turntable is connected via a relief channel the exhaust pipe is connected behind the throttle valve in the closed position. Since there must be considerable play between the valve body and the valve bore, gas penetrates behind the valve body under pressure. This gas can then flow out when the valve body is in the closed position.

Bei einer Ausführungsform ist die Stirnfläche des Ventilkörpers, angepasst an die Krümmung der Innenfläche des Auspuffrohres, rinnenartig gekrümmt und ist der Ventilkörper gegen Drehungen um die eigene Achse gesichert. Besonders zweckmässig und vorteilhaft ist es jedoch, wenn der Ventilkörper in der Ventilbohrung drehbar gestaltet und angeordnet ist und die Stirnfläche des Ventilkörpers kugelschalenförmig gehöhlt ist, wobei der Radius der Kugelschale dem Innenradius des Auspuffrohres angepasst ist. Der Ventilkörper darf sich jetzt um seine Mittelachse drehen, und es entfallen drehungsverhindernde Gleitführungen.In one embodiment, the end face of the valve body, adapted to the curvature of the inner surface of the exhaust pipe, is curved like a groove and the valve body is secured against rotation about its own axis. However, it is particularly expedient and advantageous if the valve body is designed and arranged such that it can rotate in the valve bore and the end face of the valve body is hollowed out in the shape of a spherical shell, the radius of the spherical shell is adapted to the inner radius of the exhaust pipe. The valve body is now allowed to rotate around its central axis and there are no anti-rotation sliding guides.

Die Drosselklappe ist drehbar gelagert; bei drehbarer Lagerung sind z.B. für die Geschlossenstellung Anschläge im Auspuffrohr vorgesehen; die elliptische Gestaltung der drehbar gelagerten Drosselklappe ist wesentlich. Die Drosselklappe hat bei Geschlossenstellung entlang ihrem Umfang Luft bzw. ausreichendes Spiel gegenüber dem Auspuffrohr. Der Weg des Ventilkörpers ist nach vorne hin durch Anschlag begrenzt, um ein Eindringen des Ventilkörpers in das Innere des Auspuffrohres zu verhindern. Der Weg des Ventilkörpers ist auch nach hinten hin durch Anschlag begrenzt, da ab einem bestimmten Öffnungshub der Durchlass-Querschnitt der Ventilbohrung zwischen den beiden Seiten der Drosselklappe nicht mehr wächst.The throttle valve is pivoted; with rotatable bearings e.g. stops in the exhaust pipe provided for the closed position; the elliptical design of the rotatably mounted throttle valve is essential. When closed, the throttle valve has air along its circumference or sufficient play with respect to the exhaust pipe. The path of the valve body is limited at the front by a stop in order to prevent the valve body from penetrating into the interior of the exhaust pipe. The path of the valve body is also limited towards the rear by a stop, since from a certain opening stroke the passage cross section of the valve bore between the two sides of the throttle valve no longer increases.

In der Zeichnung ist eine bevorzugte Ausführungsform der Erfindung dargestellt und zeigt:

  • Fig. 1 einen Schnitt einer Einrichtung zur Begrenzung des Staudruckes einer Auspuffmotorbremse, bei schliessendem Ventilkörper,
  • Fig. 2 die Darstellung gemäss Fig. 1 bei öffnendem Ventilkörper,
  • Fig. 3 eine Vorderansicht der Einrichtung gemäss Fig. 1 und
  • Fig. 4 eine Seitenansicht der Einrichtung gemäss Fig. 1.
A preferred embodiment of the invention is shown in the drawing and shows:
  • 1 shows a section of a device for limiting the dynamic pressure of an exhaust motor brake when the valve body is closing,
  • 2 shows the representation of FIG. 1 with the valve body open,
  • Fig. 3 is a front view of the device according to Fig. 1 and
  • 4 shows a side view of the device according to FIG. 1.

Gemäss Zeichnung ist ein Stück eines im Querschnitt kreisförmigen Auspuffrohres 1 vorgesehen, in dem eine Drosselklappe 2 um eine Achse 3 schwenkbar angeordnet ist, die sich mittig in halber Höhe des Innendurchmessers des Auspuffrohres befindet. Die Drosselklappe 2 ist elliptisch gestaltet und befindet sich, wie Fig. 1, 2 und 4 erkennen lassen, in einer leichten Schräglage, wenn sie sich in Geschlossenstellung befindet. Die Drosselklappe 2 wendet in Geschlossenstellung der Innenseite des Auspuffrohres 1 eine umlaufende Stirnfläche 4 zu. Das Schwenken der Drosselklappe 2 aus der in Fig. 4 gestrichelt gezeigten Geschlossenstellung in eine waagerechte Offenstellung und zurück erfolgt über einen Kurbeltrieb 5 mittels einer Kolben-Zylinder-Einrichtung 6.According to the drawing, a piece of an exhaust pipe 1 with a circular cross section is provided, in which a throttle valve 2 is arranged so as to be pivotable about an axis 3, which is located in the middle at half the height of the inside diameter of the exhaust pipe. The throttle valve 2 is elliptical in shape and, as can be seen in FIGS. 1, 2 and 4, is in a slightly inclined position when it is in the closed position. The throttle valve 2 turns a circumferential end face 4 in the closed position of the inside of the exhaust pipe 1. The throttle valve 2 is pivoted from the closed position shown in dashed lines in FIG. 4 into a horizontal open position and back via a crank mechanism 5 by means of a piston-cylinder device 6.

An der Oberseite des Auspuffrohres 1 ist ein Ventilgehäuse 7 vorgesehen, das sich auf die Wandung des Auspuffrohres erstreckt und dieses nach aussen hin verdeckt. Das Ventilgehäuse 7 bildet eine im Querschnitt kreisrunde Ventilbohrung 8, die sich auf der dem Inneren des Auspuffrohres 1 zugewendeten Seite absatzartig verjüngt und so einen inneren Anschlag 9 bildet. Die Ventilbohrung 8 nimmt einen Ventilkörper 10 auf, der sich in Richtung von innen nach aussen absatzartig erweitert und in Schliessstellung an dem Anschlag 9 des Ventilgehäuses anliegt. Der Ventilkörper 10 weist dem Inneren des Auspuffrohres zugewendet eine kugelschalenförmig gehöhlte Stirnfläche 11 auf und überragt die Stirnfläche 4 der Drosselklappe 2 in Achsrichtung des Auspuffrohres 1 gesehen beiderseits mit einem beachtlichen Bereich.At the top of the exhaust pipe 1, a valve housing 7 is provided, which extends to the wall of the exhaust pipe and covers it to the outside. The valve housing 7 forms a valve bore 8, which is circular in cross section and tapers on the side facing the interior of the exhaust pipe 1, thus forming an inner stop 9. The valve bore 8 receives a valve body 10, which widens in the direction from the inside to the outside and rests in the closed position on the stop 9 of the valve housing. The valve body 10 has a spherical shell-shaped end face 11 facing the interior of the exhaust pipe and extends beyond the end face 4 of the throttle valve 2 on both sides with a considerable area, as seen in the axial direction of the exhaust pipe 1.

Der Ventilkörper 10 trägt an der Rückseite einen länglichen Stempel 12, der in eine Kappe 13 ragt. Diese Kappe 13 ist an das Ventilgehäuse 7 angesetzt und an diesem mittels Sprengring gesichert. Ein vorderer umgebogener Endstreifen der Kappe bildet für den Ventilkörper 10 einen hinteren Anschlag 14, der die Hin- und Herbewegung des Ventilkörpers nach hinten hin begrenzt. Am hinteren Ende des Stempels 12 ist eine Druckscheibe 15 vorgesehen, die in der zylindrischen Kappe 13 gleitbar geführt ist. Auf der Abströmseite der geschlossenen Drosselklappe 2 mündet in das Auspuffrohr 1 ein im Querschnitt recht grosser Entlastungskanal 16, der in die Ventilbohrung 8 derart mündet, dass er bei vorgeschobener Stellung des Ventilkörpers 10 von diesem nur teilweise verschlossen ist, d.h. dass er teilweise offen ist, und dass er gemäss Fig. 2 auch bei völlig zurückgeschobenem Ventilkörper zumindest teilweise offen ist, d.h. vom Ventilkörper nur teilweise versperrt ist.The valve body 10 carries an elongated stamp 12 on the back, which protrudes into a cap 13. This cap 13 is attached to the valve housing 7 and secured there by means of a snap ring. A front bent end strip of the cap forms a rear stop 14 for the valve body 10, which limits the back and forth movement of the valve body. At the rear end of the plunger 12, a thrust washer 15 is provided which is slidably guided in the cylindrical cap 13. On the outflow side of the closed throttle valve 2, a relief duct 16 with a large cross section opens into the exhaust pipe 1, which opens into the valve bore 8 such that it is only partially closed by the valve body 10 when the valve body 10 is in the advanced position, i.e. that it is partially open and that, according to FIG. 2, it is at least partially open even when the valve body is completely pushed back, i.e. is only partially blocked by the valve body.

An der Rückseite der Druckscheibe 15 ist eine wendelförmige, aus Draht bestehende Feder 17 abgestützt, die nach aussen hin am Boden der Kappe abgestützt ist. Die Abstützung erfolgt über eine Verstelleinrichtung 18, die aber nicht vorgesehen zu sein braucht.On the back of the thrust washer 15 is supported a helical spring 17 made of wire, which is supported on the outside at the bottom of the cap. The support is provided via an adjusting device 18, which need not be provided.

Bei vorgeschobener Stellung des Ventilkörpers 10 gemäss Fig. 1 ist die Feder 17 bereits gespannt; bei zurückgeschobener Stellung des Ventilkörpers 10 gemäss Fig. 2 ist die Feder 17 verstärkt gespannt.When the valve body 10 is in the advanced position according to FIG. 1, the spring 17 is already tensioned; when the valve body 10 is retracted according to FIG. 2, the spring 17 is tightened more.

Wie Fig. 3 und 4 erkennen lassen, lässt sich die Drosselklappe 2 aus der waagerechten, d.h. parallel zur Mittelachse des Auspuffrohres 1 verlaufenden Offenstellung in die quer zu der Mittelachse verlaufende Geschlossenstellung bringen.3 and 4 can be seen, the throttle valve 2 from the horizontal, i.e. Bring the open position running parallel to the central axis of the exhaust pipe 1 into the closed position running transverse to the central axis.

Claims (7)

1. A device for limiting the dynamic pressure of an exhaust brake, wherein in an exhaust pipe (1) a throttle valve (2) is disposed so as to be rotatable on both sides from an open position to a closed position and a recess crossing the throttle valve (2) in the closed position is provided, which recess is a valve bore (8) which is provided in the exhaust pipe (1) and which is arranged close to the end face (4) of the throttle valve in the closed position and projects beyond the throttle valve end face on both sides by at least 1/5 of the diameter of the valve bore, and wherein a valve body (10) displaceable in the valve bore is pushed into the closed position by means of a spring (17), which is arranged at a distance from the exhaust pipe, characterised in that the cross section of exhaust pipe (1) is round, the throttle valve (2) elliptical and the throttle valve when in the closed position is in a slightly diagonal position, relative to a plane perpendicular to the exhaust pipe central axis; and that the valve bore (8) is arranged so that the end face (4) of the throttle valve (2) is disposed only in the closed position thereof close to the valve bore or valve body (10), the end face (11) of the valve body (10) being curved so as to adaptto the curve of the inner surface of the exhaust pipe (1).
2. A device according to claim 1, characterised in that the valve bore (8) of the valve body (10) projects beyond the throttle valve end face (4) on both sides by at least 1/4 of the diameter.
3. A device according to claim 1 or 2, characterised in that the spring (17) has a rising characteristic curve within the limits of the determined valve travel of the valve body (10).
4. A device according to claim 1,2 or 3, characterised in that a valve bore (8) and valve body (10) are arranged at a distance from the lower region of the exhaust pipe (1), preferably in the uppermost region thereof.
5. A device according to any one of the preceding claims, characterised in that behind the valve body (10) a cap (13) which is gas-tight per se is connected to the valve bore (8), in which cap a thrust washer (15) supporting the spring (7) is displaceably guided, and the space between the valve body (10) in the closed position and the thrust washer (15) is connected to the exhaust pipe (1) behind the throttle valve in the closed position via a by-pass (16).
6. A device according to any one of the preceding claims, characterised in that the valve body (10) is formed and disposed so as to be rotatable in the valve bore (8) and the end face (11) of the valve body is hollowed out in the manner of a partial sphere, the radius of the partial sphere being adapted to the inner radius of the exhaust pipe (1).
EP19850107939 1984-08-16 1985-06-26 System for limiting the dynamic pressure in an exhaust brake Expired EP0175070B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85107939T ATE31780T1 (en) 1984-08-16 1985-06-26 DEVICE FOR LIMITING THE PRESSURE PRESSURE OF AN EXHAUST ENGINE BRAKE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843430028 DE3430028A1 (en) 1984-08-16 1984-08-16 DEVICE FOR LIMITING THE EXHAUST PRESSURE OF AN EXHAUST ENGINE BRAKE
DE3430028 1984-08-16

Publications (2)

Publication Number Publication Date
EP0175070A1 EP0175070A1 (en) 1986-03-26
EP0175070B1 true EP0175070B1 (en) 1988-01-07

Family

ID=6243104

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850107939 Expired EP0175070B1 (en) 1984-08-16 1985-06-26 System for limiting the dynamic pressure in an exhaust brake

Country Status (6)

Country Link
US (1) US4682674A (en)
EP (1) EP0175070B1 (en)
JP (1) JPS6165031A (en)
AT (1) ATE31780T1 (en)
DE (1) DE3430028A1 (en)
ES (1) ES8603975A1 (en)

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Also Published As

Publication number Publication date
DE3430028A1 (en) 1986-02-27
DE3430028C2 (en) 1987-12-17
ES8603975A1 (en) 1986-01-16
US4682674A (en) 1987-07-28
EP0175070A1 (en) 1986-03-26
ATE31780T1 (en) 1988-01-15
JPH0463210B2 (en) 1992-10-09
ES545075A0 (en) 1986-01-16
JPS6165031A (en) 1986-04-03

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