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DE4130670A1 - Propeller with reduction gear in hub - uses pinion on end of engine shaft engaging internal toothed ger - Google Patents

Propeller with reduction gear in hub - uses pinion on end of engine shaft engaging internal toothed ger

Info

Publication number
DE4130670A1
DE4130670A1 DE19914130670 DE4130670A DE4130670A1 DE 4130670 A1 DE4130670 A1 DE 4130670A1 DE 19914130670 DE19914130670 DE 19914130670 DE 4130670 A DE4130670 A DE 4130670A DE 4130670 A1 DE4130670 A1 DE 4130670A1
Authority
DE
Germany
Prior art keywords
propeller
reduction gear
hub
speed reduction
ger
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.)
Ceased
Application number
DE19914130670
Other languages
German (de)
Inventor
Gero Prof Dipl Ing Madelung
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HOFFMANN GmbH and Co KG
Original Assignee
HOFFMANN GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by HOFFMANN GmbH and Co KG filed Critical HOFFMANN GmbH and Co KG
Priority to DE19914130670 priority Critical patent/DE4130670A1/en
Publication of DE4130670A1 publication Critical patent/DE4130670A1/en
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
    • B64D35/00—Transmitting power from power plants to propellers or rotors; Arrangements of transmissions

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Motor Power Transmission Devices (AREA)

Abstract

The noise generated by an aircraft propeller is reduced if the rotational speed of the propeller is reduced. Many aircraft engines incorporate a speed reduction gear to achieve this result. For those engines which do not incorporate a speed reduction gear, there is a speed reduction gear (1) which is incorporated in the propeller hub. The speed reduction gear consists of a shaft with an attached flange which can be bolted to the engine flywheel. This shaft carries a pinion which meshes with an internally toothed gear which forms part of the propeller hub. USE/ADVANTAGE - Propeller with speed reduction gear incorporated in the hub for reducing propeller noise.

Description

Durch das momentane Fluglärmproblem werden hohe Ansprüche an die derzeitigen Antriebsein­ heiten (Propelleranlage/Motoranlage) gestellt. Auf dem konventionellen Weg den Fluglärm zu mindern z. B. durch Verminderung des Durchmessers und Erhöhen der Blattzahl, ist man bei vielen Flugzeugtypen am Ende der Möglichkeiten. Eingehende Studien über Propeller zeigen, daß die Drehzahl den größten Einfluß auf die Lärmentwicklung des Propeller ausübt. Mehrere Motor­ hersteller haben nun Getriebemotoren entwickelt.The current aircraft noise problem places high demands on the current propulsion systems units (propeller system / engine system). Aircraft noise in the conventional way reduce z. B. by reducing the diameter and increasing the number of sheets, one is with many Aircraft types at the end of the possibilities. In-depth studies on propellers show that the Speed has the greatest influence on the noise development of the propeller. Multiple engine manufacturers have now developed geared motors.

Das Problem dabei ist, daß viele, sich im Betrieb befindlichen Motoren nicht mit Getrieben ausstatten lassen, und somit der Fluglärm nicht drastisch reduziert werden kann. Eine einfache Drehzahlveränderung ohne Über-/Untersetzung würde die abgegebene Leistung gemäß des Triebwerkskennfeldes verändern. Dies kann die Flugleistungen beeinflussen bzw. verschlech­ tern.The problem with this is that many engines in operation are not geared equip, and so the aircraft noise can not be drastically reduced. An easy one Speed change without step-up / step-down would be the output according to Change engine map. This can influence or worsen flight performance tern.

Das im Anspruch 1 vorgestellte Propellergetriebe läßt sich wie ein Propeller direkt auf die Abriebswellenflansche aller existierenden Motoren so anpassen, daß eine Typmodifizierung nur in den seltensten Fällen notwendig ist, und somit die Zulassung des Motors nicht beeinflußt wird. Es können dadurch ältere Fluggeräte in der Lärmemission auf einfache Weise auf den heutigen Stand der Technik gebracht werden. Bei manchen Fluggeräten kann sich sogar durch die nun mögliche Optimierung von Propellerdurchmesser, Blattzahl, Drehzahl und Leistung eine Verbes­ serung der Flugleistungen bei reduzierter Lärmentwicklung ergeben.The propeller transmission presented in claim 1 can be directly like a propeller on the Adjust the wear shaft flanges of all existing motors so that a type modification only is rarely necessary, and thus the approval of the engine is not affected. This allows older aircraft to emit noise in a simple way on today's State of the art. With some aircraft it can even go through the now possible optimization of propeller diameter, number of blades, speed and power of a verb flight performance with reduced noise.

Das Propellergetriebe kann entweder separat als Zwischenflansch zwischen Motor und Propeller gesetzt werden oder wird direkt als Propellernabe ausgeführt. Ein entstehendes Differential­ moment kann über einen Haltebügel auf dem Motorgehäuse oder an der Zelle abgestützt werden.The propeller gearbox can either be used separately as an intermediate flange between the engine and propeller be set or is executed directly as a propeller hub. An emerging differential torque can be supported on the motor housing or on the cell using a bracket.

Ein Ausführungsbeispiel ist in der Zeichnung dargestellt. Es handelt sich hierbei um ein mechani­ sches Getriebe, das über eine exzentrische Innenverzahnung eine fest vorgegebene Drehzahl­ differenz zwischen Propeller und Motor ermöglicht. Das Differentialmoment wird über einen Haltebügel am Motorgehäuse oder an der Zelle abgestützt. Die gesamte Einheit kann so in eine Propellernabe geflanscht werden.An embodiment is shown in the drawing. It is a mechanical cal gearbox, which has a predetermined speed via an eccentric internal toothing difference between propeller and motor. The differential torque is over a Support bracket supported on the motor housing or on the cell. The entire unit can be divided into one Flanged propeller hub.

Desweiteren können Planetengetriebe, hydraulische-, oder hydromechanische Wandler die Drehzahldifferenz erzeugen.Furthermore, planetary gears, hydraulic or hydromechanical converters can Generate speed difference.

Claims (3)

1. Propellergetriebe für Motoren, insbesondere Motoren, die selbst nicht mit Getriebe ausgerüstet sind, dadurch gekennzeichnet, daß das Getriebe direkt auf den Motorabtrieb gesetzt wird.1. Propeller gearbox for engines, in particular engines that are not themselves equipped with gearboxes, characterized in that the gearbox is placed directly on the engine output. 2. Propellergetriebe nach Anspruch 1, dadurch gekennzeichnet, daß das Getriebe zwischen Propeller- und Motorflansch gesetzt werden kann.2. Propeller gearbox according to claim 1, characterized, that the gearbox can be placed between the propeller and motor flange. 3. Propellergetriebe nach Anspruch 1, dadurch gekennzeichnet, daß das Getriebe in der Propellernabe sitzt oder als Propellernabe ausgeführt werden kann.3. Propeller gearbox according to claim 1, characterized, that the gearbox sits in the propeller hub or is designed as a propeller hub can.
DE19914130670 1991-09-14 1991-09-14 Propeller with reduction gear in hub - uses pinion on end of engine shaft engaging internal toothed ger Ceased DE4130670A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19914130670 DE4130670A1 (en) 1991-09-14 1991-09-14 Propeller with reduction gear in hub - uses pinion on end of engine shaft engaging internal toothed ger

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19914130670 DE4130670A1 (en) 1991-09-14 1991-09-14 Propeller with reduction gear in hub - uses pinion on end of engine shaft engaging internal toothed ger

Publications (1)

Publication Number Publication Date
DE4130670A1 true DE4130670A1 (en) 1992-05-14

Family

ID=6440654

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19914130670 Ceased DE4130670A1 (en) 1991-09-14 1991-09-14 Propeller with reduction gear in hub - uses pinion on end of engine shaft engaging internal toothed ger

Country Status (1)

Country Link
DE (1) DE4130670A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE522566C (en) * 1929-02-02 1931-04-10 An Stabilimenti Farina Soc Propeller drive with reduction gear arranged in a hollow propeller hub
DE535707C (en) * 1931-10-14 Fiat Spa Propeller drive with reduction gear
US1967753A (en) * 1930-10-30 1934-07-24 Bendix Res Corp Propeller
DE708697C (en) * 1936-12-22 1941-07-26 Hans Klemm Dr Ing Method for improving the efficiency of a propeller directly driven by an aircraft engine by means of a reduction gear
DE3445181A1 (en) * 1983-12-12 1985-06-13 United Technologies Corp., Hartford, Conn. TRANSMISSION FOR POWER TRANSFER

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE535707C (en) * 1931-10-14 Fiat Spa Propeller drive with reduction gear
DE522566C (en) * 1929-02-02 1931-04-10 An Stabilimenti Farina Soc Propeller drive with reduction gear arranged in a hollow propeller hub
US1967753A (en) * 1930-10-30 1934-07-24 Bendix Res Corp Propeller
DE708697C (en) * 1936-12-22 1941-07-26 Hans Klemm Dr Ing Method for improving the efficiency of a propeller directly driven by an aircraft engine by means of a reduction gear
DE3445181A1 (en) * 1983-12-12 1985-06-13 United Technologies Corp., Hartford, Conn. TRANSMISSION FOR POWER TRANSFER

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Legal Events

Date Code Title Description
OAV Applicant agreed to the publication of the unexamined application as to paragraph 31 lit. 2 z1
OP8 Request for examination as to paragraph 44 patent law
8131 Rejection