EP0338549B1 - Safety device for a fan of a combustion engine - Google Patents

Safety device for a fan of a combustion engine Download PDF

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Publication number
EP0338549B1
EP0338549B1 EP89107101A EP89107101A EP0338549B1 EP 0338549 B1 EP0338549 B1 EP 0338549B1 EP 89107101 A EP89107101 A EP 89107101A EP 89107101 A EP89107101 A EP 89107101A EP 0338549 B1 EP0338549 B1 EP 0338549B1
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EP
European Patent Office
Prior art keywords
safety device
lattice
fan
clamping
fan housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP89107101A
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German (de)
French (fr)
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EP0338549A3 (en
EP0338549A2 (en
Inventor
Hans-Peter Mahlberg
Richard Müller
Paul Dr. Neussel
Franz-Josef Steffen
Holger Zimmermann
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Kloeckner Humboldt Deutz AG
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Kloeckner Humboldt Deutz AG
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Publication date
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Priority to AT89107101T priority Critical patent/ATE79162T1/en
Publication of EP0338549A2 publication Critical patent/EP0338549A2/en
Publication of EP0338549A3 publication Critical patent/EP0338549A3/en
Application granted granted Critical
Publication of EP0338549B1 publication Critical patent/EP0338549B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
    • F04D29/701—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps
    • F04D29/703—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps specially for fans, e.g. fan guards

Definitions

  • the invention relates to a protective device according to the preamble of claim 1.
  • Protective devices are known which are arranged in front of the inlet ring of a blower of an internal combustion engine and are connected to the housing of the blower by means of a screw connection.
  • the protective device preferably consists of wires with a circular cross section, which are arranged in a ring or spiral shape.
  • the grille is elastically supported on relatively high stilts, making it oscillatable and prone to resonance. Due to strong vibrations of the blower, individual grid wires of the protective device break off easily and can be pulled into the blower. The consequence of this is a blower failure and often even a complete damage to the engine.
  • screws, washers, rubber elements and bushings are required to fasten the protective device, which makes the assembly of the protective device and thereby also the repair of the fan more difficult.
  • a blower housing for electronic devices is known from EP-A 190 835.
  • Several octagonal openings are arranged in the blower housing, which form the inlet for the cooling air.
  • a grille is arranged in front of the openings, which lies against the blower housing via a clamp connection.
  • the invention has for its object to provide a protective device for a fan of an internal combustion engine, the fan being driven by a V-belt.
  • the protective device should be designed so that it is easy to install despite the V-belt and offers sufficient protection.
  • the protective device can be clamped onto the blower in such a way that it almost encloses the V-belt and is easy to assemble.
  • a plate in particular a disc, is advantageously arranged in the center of the grid, to which the clamping brackets are attached.
  • the clamping brackets consist of wires whose diameter is larger than the diameter of the grid wires. It is advantageous to use simple structural steel z. B. ST 37 K to use.
  • the grid sections adjacent to the fourth tensioning bracket are advantageously arranged axially offset.
  • the opening of the blower housing and the tensioning bracket, as seen in the axial direction of the grille / are designed in the form of a segment of a circle, and the outermost circumferential region seen in the axial direction is bent approximately at right angles to the blower opening in the axial direction. This outermost circumferential area clasps the blower housing and forms the clamp connection.
  • the outermost circumferential region advantageously has a semicircular cross section as seen in the circumferential direction and each of the two brackets of the outermost circumferential region touches the blower housing at two points.
  • the blower housing expediently has a groove into which the outermost peripheral region engages with its semicircular design. As a result, the grid is fixed axially.
  • the clamping brackets at the inlet radius of the fan housing are advantageously designed with an exemption from the latter.
  • the clamping brackets expediently have a kink between the plate and the outermost circumferential region, so that the grid is attached in a space-saving manner.
  • the two isosceles sides of the tensioning brackets advantageously form an angle of approximately 45 degrees. This has the advantage that each of these isosceles sides engages the blower housing at a distance from the other isosceles side and the clamping connection is thereby improved.
  • the lattice from concentrically arranged rings or from spirally bent lattice bars.
  • Figures 1 and 2 show a protective device according to the invention for a blower of an internal combustion engine in cross section and in plan view.
  • 1 is. shown in cross section, a Nachleitradgebläse, an impeller 11 with blades 12 is surrounded by a blower housing 2.
  • the impeller 11 is connected to a drive roller 13 which is arranged on the axis 16 of the impeller 11 and is driven via a V-belt 14.
  • the blower housing 2 has on its end facing the drive roller 13 on its circumference a groove 15 into which a protective device according to the invention engages via a clamp connection.
  • the protective device consists of a grid 1 formed from wires, which is fixed on four approximately identical clamping brackets 3, for example by welding seams, which are distributed around the circumference at a distance from one another and rest on the blower housing 2 via a clamp connection.
  • the clamping brackets 3 are designed in the form of a segment of a circle as viewed in the axial direction of the grille 1, the outermost circumferential region 5 as viewed in the axial direction being bent approximately at right angles to the blower opening in the axial direction.
  • the outermost circumferential region 5 has a semicircular cross section 6, seen in the circumferential direction, which engages in the groove 15 of the blower housing 2.
  • the two isosceles sides of the clamping bracket 3 enclose an angle of approximately 45 degrees.
  • the grid 1 is arranged on four clamping brackets 3, three of which are each offset by 90 degrees to one another and the fourth clamping bracket 3a to its two adjacent clamping brackets 3 includes an angle of over 90 degrees on the one hand and an angle of less than 90 degrees on the other.
  • the V-belt 14 there is space for the V-belt 14 on both sides of the fourth tensioning bracket 3a. If the angle between the fourth tensioning bracket 3a and its adjacent tensioning bracket 3 is less than 90 degrees, this area is provided for the load strand, while the other side of the fourth tensioning bracket 3a faces the empty strand of the V-belt 14. So that the grid is to be arranged close to the V-belt 14, the grid sections 10a, 10b adjacent to the fourth tensioning bracket 3a are arranged axially offset.
  • a plate 4 In the center of the grid 1 there is a plate 4, here a disc, to which the tensioning brackets are attached.
  • This plate 4 is arranged concentrically in front of the drive roller 13 and can cover it completely.
  • each of the two brackets of the outermost circumferential region 5 touches the blower housing 2 at two points 7a, 7b, as a result of which the protective device is axially fixed.
  • the clamping bracket 3 can apply the necessary clamping force, they advantageously consist of wires whose diameter is larger than the diameter of the grid wires. Furthermore, it is advantageous to carry out the clamping bracket 3 at the inlet radius of the blower housing 2 with a clearance 8 to the latter. This measure serves for better sound insulation.
  • the tensioning brackets 3 advantageously have a kink 9 between the plate 4 and the outermost peripheral region 5.
  • FIG. 2 shows an advantageous embodiment in which the grid 1 is formed from rings arranged concentrically. It can also be advantageous, as shown in FIG. 3, if the lattice consists of spirally bent lattice bars.
  • the protective device is constructed almost symmetrically and the center of gravity is therefore in the axis of the blower or the grille 1. As a result, the protective device is low-vibration and does not tend to resonate so easily.
  • the grille or the protective device can be easily removed and can later be re-assembled simply by pushing or pushing it onto the blower housing 2. Due to the large number of equal parts and the use of simple structural steel, i. H. no spring steel, the protective device is inexpensive to manufacture.
  • the torsional strength of the protective device is achieved by an automatic slight incorporation of the outermost peripheral region 5 into the blower housing 2.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)

Abstract

The object of the invention is to improve a safety device for a fan of an internal combustion engine, with a grille (1) formed from wires and arranged over the opening on the fan housing, which grille is firmly seated on the fan housing (2), so that it is easy to assemble with little vibration so that resonances are largely avoided. This object is fulfilled according to the invention in that the grille (1) is firmly arranged on at least three clamping straps (3), roughly identical in form, which are spaced in relation to one another on the circumference and are attached to the fan housing (2) via a clamp connection. Safety device for fans of internal combustion engines. <IMAGE>

Description

Die Erfindung betrifft eine Schutzvorrichtung nach dem Oberbegriff des Anspruchs 1.The invention relates to a protective device according to the preamble of claim 1.

Es sind Schutzvorrichtungen bekannt, welche vor dem Einlaufring eines Gebläses einer Brennkraftmaschine angeordnet sind und mit dem Gehäuse des Gebläses über eine Verschraubung verbunden sind. Die Schutzvorrichtung besteht vorzugsweise aus Drähten mit kreisrundem Querschnitt, welche in Ring- oder Spiralform angeordnet sind. Zur Befestigung wird das Gitter auf relativ hohen Stelzen elastisch gelagert, wodurch es schwingfähig ist und zu Resonanzen neigt. Aufgrund starker Vibrationen des Gebläses brechen einzelne Gitterdrähte der Schutzvorrichtung leicht ab und können in das Gebläse hineingezogen werden. Die Folge davon ist ein Ausfall des Gebläses und oftmals sogar ein Totalschaden des Motors. Desweiteren werden zur Befestigung der Schutzvorrichtung Schrauben, Unterlegscheiben, Gummielemente und Buchsen benötigt, wodurch die Montage der Schutzvorrichtung und dadurch auch die Reparatur des Gebläses erschwert ist.Protective devices are known which are arranged in front of the inlet ring of a blower of an internal combustion engine and are connected to the housing of the blower by means of a screw connection. The protective device preferably consists of wires with a circular cross section, which are arranged in a ring or spiral shape. For fastening, the grille is elastically supported on relatively high stilts, making it oscillatable and prone to resonance. Due to strong vibrations of the blower, individual grid wires of the protective device break off easily and can be pulled into the blower. The consequence of this is a blower failure and often even a complete damage to the engine. Furthermore, screws, washers, rubber elements and bushings are required to fasten the protective device, which makes the assembly of the protective device and thereby also the repair of the fan more difficult.

Aus der EP-A 190 835 ist ein Gebläsegehäuse für elektronische Geräte bekannt. Im Gebläsegehäuse sind mehrere achteckige Öffnungen angeordnet, die den Einlaß für die Kühlluft bilden. Vor den Öffnungen ist jeweils ein Gitter angeordnet, welches am Gebläsegehäuse über eine Klemmverbindung anliegt.A blower housing for electronic devices is known from EP-A 190 835. Several octagonal openings are arranged in the blower housing, which form the inlet for the cooling air. A grille is arranged in front of the openings, which lies against the blower housing via a clamp connection.

Der Erfindung liegt die Aufgabe zugrunde, eine Schutzvorrichtung für ein Gebläse einer Brennkraftmaschine zu schaffen, wobei das Gebläse von einem Keilriemen angetrieben ist. Die Schutzvorrichtung soll dabei so ausgebildet sein, daß sie trotz des Keilriemens leicht zu montieren ist und hinreichenden Schutz bietet.The invention has for its object to provide a protective device for a fan of an internal combustion engine, the fan being driven by a V-belt. The protective device should be designed so that it is easy to install despite the V-belt and offers sufficient protection.

Erfindungsgemäß wird diese Aufgabe durch die kennzeichnenden Merkmale des Patentanspruchs 1 gelöst.According to the invention, this object is achieved by the characterizing features of patent claim 1.

Durch die erfindungsgemäße unsymmetrische Anordnung des vierten Spannbügels kann die Schutzvorrichtung so auf das Gebläse geklemmt werden, daß sie den Keilriemen nahezu umschließt und leicht zu montieren ist.Due to the asymmetrical arrangement of the fourth clamping bracket according to the invention, the protective device can be clamped onto the blower in such a way that it almost encloses the V-belt and is easy to assemble.

Zur Verbindung der Spannbügel untereinander ist vorteilhafterweise im Zentrum des Gitters eine Platte, insbesondere eine Scheibe angeordnet, an der die Spannbügel befestigt sind.To connect the clamping brackets to one another, a plate, in particular a disc, is advantageously arranged in the center of the grid, to which the clamping brackets are attached.

Erfindungsgemäß bestehen die Spannbügel aus Drähten, deren Durchmesser größer ist als der Durchmesser der Gitterdrähte. Es ist vorteilhaft, für die Spannbügel und Gitterdrähte einfachen Baustahl z. B. ST 37 K zu benutzen.According to the invention, the clamping brackets consist of wires whose diameter is larger than the diameter of the grid wires. It is advantageous to use simple structural steel z. B. ST 37 K to use.

Damit das Gitter nahe an den Keilriemen herangebracht werden kann, sind vorteilhafterweise die dem vierten Spannbügel benachbarten Gitterabschnitte axial versetzt angeordnet.So that the grid can be brought close to the V-belt, the grid sections adjacent to the fourth tensioning bracket are advantageously arranged axially offset.

Vorteilhafterweise sind die Öffnung des Gebläsegehäuses und die Spannbügel, in Achsrichtung des Gitters gesehen/ kreissegmentförmig ausgebildet und der in Achsrichtung gesehene äußerste Umfangsbereich ist etwa rechtwinklig zur Gebläseöffnung in Achsrichtung abgebogen. Dieser äußerste Umfangsbereich umklammert das Gebläsegehäuse und bildet die Klemmverbindung.Advantageously, the opening of the blower housing and the tensioning bracket, as seen in the axial direction of the grille / are designed in the form of a segment of a circle, and the outermost circumferential region seen in the axial direction is bent approximately at right angles to the blower opening in the axial direction. This outermost circumferential area clasps the blower housing and forms the clamp connection.

Vorteilhafterweise weist der äußerste Umfangsbereich einen in Umfangsrichtung gesehenen halbkreisförmigen Querschnitt auf und berührt jeder der zwei Bügel des äußersten Umfangsbereiches an zwei Stellen das Gebläsegehäuse. Zweckmäßigerweise weist das Gebläsegehäuse eine Nut auf, in die der äußerste Umfangsbereich mit seiner halbkreisförmigen Ausbildung eingreift. Dadurch ist das Gitter axial fixiert.The outermost circumferential region advantageously has a semicircular cross section as seen in the circumferential direction and each of the two brackets of the outermost circumferential region touches the blower housing at two points. The blower housing expediently has a groove into which the outermost peripheral region engages with its semicircular design. As a result, the grid is fixed axially.

Um akustische Störungen zu vermeiden, sind vorteilhafterweise die Spannbügel am Einlaufradius des Gebläsegehäuses mit einer Freistellung zu diesem ausgeführt.In order to avoid acoustic disturbances, the clamping brackets at the inlet radius of the fan housing are advantageously designed with an exemption from the latter.

Zweckmäßigerweise weisen die Spannbügel zwischen der Platte und dem äußersten Umfangsbereich einen Knick auf, damit das Gitter platzsparend angebracht ist.The clamping brackets expediently have a kink between the plate and the outermost circumferential region, so that the grid is attached in a space-saving manner.

Vorteilhafterweise schließen die beiden gleichschenkligen Seiten der Spannbügel einen Winkel von ungefähr 45 Grad ein. Dies hat den Vorteil, daß jede dieser gleichschenkligen Seiten mit einem Abstand von der anderen gleichschenkligen Seite am Gebläsegehäuse angreift und dadurch die Klemmverbindung verbessert ist.The two isosceles sides of the tensioning brackets advantageously form an angle of approximately 45 degrees. This has the advantage that each of these isosceles sides engages the blower housing at a distance from the other isosceles side and the clamping connection is thereby improved.

Es ist zweckmäßig, das Gitter aus konzentrisch angeordneten Ringen oder aus spiralförmig gebogenen Gitterstäben zu bilden.It is expedient to form the lattice from concentrically arranged rings or from spirally bent lattice bars.

Weitere Merkmale der Erfindung ergeben sich aus der Beschreibung und den Figuren, die zwei Ausführungsformen der Erfindung zeigen und nachfolgend näher erläutert sind.Further features of the invention result from the description and the figures, which show two embodiments of the invention and are explained in more detail below.

Es zeigt;

  • Fig.1 Einen Querschnitt durch ein Nachleitradgebläse mit vor der Öffnung des Gebläsegehäuses montierter, erfindungsgemäßer Schutzvorrichtung
  • Fig.2 Eine Draufsicht in Achsrichtung auf eine erfindungsgemäße Schutzvorrichtung
  • Fig.3 Schematisch eine Draufsicht auf eine erfindungsgemäße Schutzvorrichtung, bei der das Gitter aus spiralförmig gebogenen Gitterstäben besteht.
It shows;
  • 1 shows a cross section through a Nachleitrad blower with the inventive protective device mounted in front of the opening of the blower housing
  • 2 shows a plan view in the axial direction of a protective device according to the invention
  • 3 shows a schematic plan view of a protective device according to the invention, in which the grating consists of spirally bent grating bars.

Die Figuren 1 und 2 zeigen eine erfindungsgemäße Schutzvorrichtung für ein Gebläse einer Brennkraftmaschine im Querschnitt und in Draufsicht. In der Fig. 1 ist. im Querschnitt ein Nachleitradgebläse gezeigt, wobei ein Laufrad 11 mit Schaufeln 12 von einem Gebläsegehäuse 2 umgeben ist. Das Laufrad 11 ist mit einer Antriebsrolle 13 verbunden, die auf der Achse 16 des Laufrades 11 angeordnet ist und über einen Keilriemen 14 angetrieben wird. Das Gebläsegehäuse 2 weist an seiner zur Antriebsrolle 13 gewandten Stirnseite auf seinem Umfang eine Nut 15 auf, in die eine erfindungsgemäße Schutzvorrichtung über eine Klemmverbindung eingreift.Figures 1 and 2 show a protective device according to the invention for a blower of an internal combustion engine in cross section and in plan view. 1 is. shown in cross section, a Nachleitradgebläse, an impeller 11 with blades 12 is surrounded by a blower housing 2. The impeller 11 is connected to a drive roller 13 which is arranged on the axis 16 of the impeller 11 and is driven via a V-belt 14. The blower housing 2 has on its end facing the drive roller 13 on its circumference a groove 15 into which a protective device according to the invention engages via a clamp connection.

Die Schutzvorrichtung besteht aus einem aus Drähten gebildeten Gitter 1, welches auf vier etwa identisch ausgebildeten Spannbügeln 3 festliegend z.B. durch Schweißnähte angeordnet ist, die über den Umfang verteilt mit Abstand zueinander angeordnet sind und am Gebläsegehäuse 2 über eine Klemmverbindung anliegen. Die Spannbügel 3 sind in Achsrichtung des Gitters 1 gesehen kreissegmentförmig ausgebildet, wobei der in Achsrichtung gesehene äußerste Umfangsbereich 5 etwa rechtwinklig zur Gebläseöffnung in Achsrichtung abgebogen ist. Der äußerste Umfangsbereich 5 weist dabei einen in Umfangsrichtung gesehenen, halbkreisförmigen Querschnitt 6 auf, der in die Nut 15 des Gebläsegehäuses 2 eingreift. Die beiden gleichschenkligen Seiten der Spannbügel 3 schließen einen Winkel von ungefähr 45 Grad ein.The protective device consists of a grid 1 formed from wires, which is fixed on four approximately identical clamping brackets 3, for example by welding seams, which are distributed around the circumference at a distance from one another and rest on the blower housing 2 via a clamp connection. The clamping brackets 3 are designed in the form of a segment of a circle as viewed in the axial direction of the grille 1, the outermost circumferential region 5 as viewed in the axial direction being bent approximately at right angles to the blower opening in the axial direction. The outermost circumferential region 5 has a semicircular cross section 6, seen in the circumferential direction, which engages in the groove 15 of the blower housing 2. The two isosceles sides of the clamping bracket 3 enclose an angle of approximately 45 degrees.

Das Gitter 1 ist auf vier Spannbügeln 3 angeordnet, von denen drei jeweils um 90 Grad zueinander versetzt angeordnet sind und der vierte Spannbügel 3a zu seinen beiden benachbarten Spannbügeln 3 einerseits einen Winkel von über 90 Grad und andererseits einen Winkel von weniger als 90 Grad einschließt. Dadurch ist beidseitig des vierten Spannbügels 3a Platz für den Keilriemen 14 vorhanden. Beträgt der Winkel zwischen dem vierten Spannbügel 3a und seinem benachbarten Spannbügel 3 weniger als 90 Grad, so ist dieser Bereich für den Lasttrum vorgesehen, während die andere Seite des vierten Spannbügels 3a dem Leertrum des Keilriemens 14 zugewandt ist. Damit das Gitter nahe am Keilriemen 14 anzuordnen ist, sind die dem vierten Spannbügel 3a benachbarten Gitterabschnitte 10a, 10b axial versetzt angeordnet.The grid 1 is arranged on four clamping brackets 3, three of which are each offset by 90 degrees to one another and the fourth clamping bracket 3a to its two adjacent clamping brackets 3 includes an angle of over 90 degrees on the one hand and an angle of less than 90 degrees on the other. As a result, there is space for the V-belt 14 on both sides of the fourth tensioning bracket 3a. If the angle between the fourth tensioning bracket 3a and its adjacent tensioning bracket 3 is less than 90 degrees, this area is provided for the load strand, while the other side of the fourth tensioning bracket 3a faces the empty strand of the V-belt 14. So that the grid is to be arranged close to the V-belt 14, the grid sections 10a, 10b adjacent to the fourth tensioning bracket 3a are arranged axially offset.

Im Zentrum des Gitters 1 ist eine Platte 4, hier eine Scheibe angeordnet, an der die Spannbügel befestigt sind. Diese Platte 4 ist konzentrisch vor der Antriebsrolle 13 angeordnet und kann diese vollständig abdecken.In the center of the grid 1 there is a plate 4, here a disc, to which the tensioning brackets are attached. This plate 4 is arranged concentrically in front of the drive roller 13 and can cover it completely.

Aus der Figur 1 ist zu ersehen, daß jeder der zwei Bügel des äußersten Umfangbereiches 5 an zwei Stellen 7a, 7b das Gebläsegehäuse 2 berührt, wodurch die Schutzvorrichtung axial fixiert ist. Damit die Spannbügel 3 die nötige Klemmkraft aufbringen können, bestehen sie vorteilhafterweise aus Drähten, deren Durchmesser größer ist als der Durchmesser der Gitterdrähte. Desweiteren ist es vorteilhaft, die Spannbügel 3 am Einlaufradius des Gebläsegehäuses 2 mit einer Freistellung 8 zu diesem auszuführen. Diese Maßnahme dient zur besseren Schallisolierung.It can be seen from FIG. 1 that each of the two brackets of the outermost circumferential region 5 touches the blower housing 2 at two points 7a, 7b, as a result of which the protective device is axially fixed. So that the clamping bracket 3 can apply the necessary clamping force, they advantageously consist of wires whose diameter is larger than the diameter of the grid wires. Furthermore, it is advantageous to carry out the clamping bracket 3 at the inlet radius of the blower housing 2 with a clearance 8 to the latter. This measure serves for better sound insulation.

Damit die Schutzvorrichtung wenig Platz beansprucht, weisen die Spannbügel 3 vorteilhafterweise zwischen der Platte 4 und dem äußersten Umfangsbereich 5 einen Knick 9 auf.So that the protective device takes up little space, the tensioning brackets 3 advantageously have a kink 9 between the plate 4 and the outermost peripheral region 5.

Die Fig. 2 zeigt eine vorteilhafte Ausführungsform, bei der das Gitter 1 aus konzentrisch angeordneten Ringen gebildet ist. Es kann auch vorteilhaft sein, wie in Fig. 3 gezeigt, wenn das Gitter aus spiralförmig gebogenen Gitterstäben besteht.FIG. 2 shows an advantageous embodiment in which the grid 1 is formed from rings arranged concentrically. It can also be advantageous, as shown in FIG. 3, if the lattice consists of spirally bent lattice bars.

Es ist ein wesentlicher Vorteil der Erfindung, daß zur Befestigung der Schutzvorrichtung 1 kein Befestigungselement benötigt wird. Desweiteren sind die Spannbügel 3 identisch ausgebildet und somit gleiche Teile, wodurch die Fertigung vereinfacht ist. Ein weiterer wesentlicher Vorteil ist, daß die Schutzvorrichtung nahezu symmetrisch aufgebaut ist und dadurch der Schwerpunkt in der Achse des Gebläses bzw. des Gitters 1 liegt. Dadurch ist die Schutzvorrichtung schwingungsarm und neigt nicht so leicht zu Resonanzen. Bei der Montage des Keilriemens 14 oder der Reparatur des Gebläses ist das Gitter bzw. die Schutzvorrichtung einfach zu entfernen und kann später einfach durch Aufdrücken bzw. Aufschieben auf das Gebläsegehäuse 2 wieder montiert werden. Durch die große Anzahl von gleichen Teilen und die Verwendung von einfachem Baustahl, d. h. kein Federstahl, ist die Schutzvorrichtung kostengünstig herzustellen.It is an essential advantage of the invention that no fastening element is required for fastening the protective device 1. Furthermore, the clamping bracket 3 are identical and thus the same parts, which simplifies production. Another important advantage is that the protective device is constructed almost symmetrically and the center of gravity is therefore in the axis of the blower or the grille 1. As a result, the protective device is low-vibration and does not tend to resonate so easily. When installing the V-belt 14 or repairing the blower, the grille or the protective device can be easily removed and can later be re-assembled simply by pushing or pushing it onto the blower housing 2. Due to the large number of equal parts and the use of simple structural steel, i. H. no spring steel, the protective device is inexpensive to manufacture.

Die Drehfestigkeit der Schutzvorrichtung ist durch ein selbsttätiges geringfügiges Einarbeiten des äußersten Umfangsbereiches 5 in das Gebläsegehäuse 2 erreicht.The torsional strength of the protective device is achieved by an automatic slight incorporation of the outermost peripheral region 5 into the blower housing 2.

Claims (10)

1. A safety device for a fan having a lattice (1) arranged over the opening of the fan housing (2) and formed from wires, which lattice rests through a clamp connection against the fan housing (2),
characterised in that the fan is driven by a V-belt (14) of a combustion engine and the lattice (1) is arranged to lie stationarily on four approximately identically formed clamping stirrup pieces (3), three of which are arranged offset in relation to one another in each case by 90° and the fourth clamping stirrup piece (3a) includes with its two adjacent clamping stirrups for the one part an angle of more than 90° and for the other an angle of less than 90°.
2. A safety device according to Claim 1,
characterised in that, in the centre of the lattice (1), a plate (4), especially a disc, is arranged on which the clamping stirrup pieces (3) are secured.
3. A safety device according to Claim 1 or 2,
characterised in that the clamping stirrup pieces (3) comprise wires the diameter of which is larger than the diameter of the lattice wires.
4. A safety device according to any one of Claims 1 to 3,
characterised in that the lattice sections (10a, 10b) adjacent to the fourth clamping stirrup piece (3a) lie axially staggered.
5. A safety device according to any one of Claims 1 to 4,
characterised in that the opening of the fan housing (2) is made circular and the clamping stirrup pieces (3) are made in circular segment form, seen in the axial direction of the lattice (1),and the outermost circumferential region (5), seen in the axial direction, is bent off in the axial direction approximately at right angles to the fan opening.
6. A safety device according to Claim 5,
characterised in that the outermost circumferential region (5) possesses a semi-circular cross-section (2), seen in the circumferential direction.
7. A safety device according to Claim 5 or 6,
characterised in that each of the two stirrup pieces of the outermost circumferential region (5) contacts the fan housing (2) at two points (7a, 7b).
8. A safety device according to any one of Claims 5 to 7,
characterised in that the clamping stirrup pieces (3) are made at the entry radius of the fan housing (2) with a clearance (8) from the latter.
9. A safety device according to any one of Claims 5 to 8,
characterised in that the clamping stirrup pieces (3) have a bend (9) between the plate (4) and the outermost circumferential region (5).
10. A safety device according to any one of Claims 5 to 9,
characterised in that the two equal sides of each of the clamping stirrup pieces (3) include an angle of approximately 45°.
EP89107101A 1988-04-21 1989-04-20 Safety device for a fan of a combustion engine Expired - Lifetime EP0338549B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89107101T ATE79162T1 (en) 1988-04-21 1989-04-20 PROTECTION DEVICE FOR A BLOWER OF AN ENGINE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3813431A DE3813431A1 (en) 1988-04-21 1988-04-21 PROTECTIVE DEVICE FOR A BLOWER OF AN INTERNAL COMBUSTION ENGINE
DE3813431 1988-04-21

Publications (3)

Publication Number Publication Date
EP0338549A2 EP0338549A2 (en) 1989-10-25
EP0338549A3 EP0338549A3 (en) 1990-01-03
EP0338549B1 true EP0338549B1 (en) 1992-08-05

Family

ID=6352563

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89107101A Expired - Lifetime EP0338549B1 (en) 1988-04-21 1989-04-20 Safety device for a fan of a combustion engine

Country Status (3)

Country Link
EP (1) EP0338549B1 (en)
AT (1) ATE79162T1 (en)
DE (2) DE3813431A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4337631A1 (en) * 1993-11-04 1995-05-11 Kloeckner Humboldt Deutz Ag Protective device for a blower of an internal combustion engine
NL9402187A (en) * 1994-12-22 1996-08-01 Helpman Intellectual Propertie Household fan.
DE10111397B4 (en) * 2001-03-09 2010-04-15 Ebm-Papst Mulfingen Gmbh & Co. Kg Protective grille for fans
DE102005028104A1 (en) * 2005-06-16 2006-12-21 Stadtmüller, Uwe Support strut for protective grid with wall-ring support and method for its production
DE102015200439A1 (en) * 2015-01-14 2016-07-14 Siemens Aktiengesellschaft Arrangement, gear compressor
DE102015201704A1 (en) 2015-01-30 2016-08-04 Ebm-Papst Mulfingen Gmbh & Co. Kg recording system

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB575561A (en) * 1944-03-24 1946-02-22 Maurice Geoffrey Woods Improvements in and relating to electric fans
US2728541A (en) * 1954-10-29 1955-12-27 Chelsea Products Inc Means to support a motor driven fan from a carrying panel
US2968437A (en) * 1955-10-31 1961-01-17 William R Mobley Method and means for circulating air under pressure of radially propelled horizontal jets
DE2345539A1 (en) * 1973-09-10 1975-03-20 Siemens Ag Wire inlet guard for wall mounted fan - has radial supports at angle to direction of flow
US4657485A (en) * 1984-04-19 1987-04-14 Hartwig Richard K Ceiling fan guard
GB8501657D0 (en) * 1985-01-23 1985-02-27 Loh Kg Rittal Werk Fan mounting

Also Published As

Publication number Publication date
DE58901963D1 (en) 1992-09-10
ATE79162T1 (en) 1992-08-15
EP0338549A3 (en) 1990-01-03
EP0338549A2 (en) 1989-10-25
DE3813431A1 (en) 1989-11-02

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