Lubrication arrangement for a speed-reduction gear for an aircraft engine

• US 4,583,416 A
• Filed: 05/17/1983
• Issued: 04/22/1986
• Est. Priority Date: 05/18/1982
• Status: Expired due to Fees

• Current Assignee: Dr ING HCF Porsche AG
• Original Assignee: Ing. H.C.F. Porsche Ag
• Inventors: Muller, Robert
• Primary Examiner(s): Braun, Leslie A.
• Assistant Examiner(s): Desai, Shirish
• Application Number:
  US06/495,418
• Time in Patent Office: 1,071 Days
• Field of Search: 74/467, 74/468, 74/606 R, 74/606 A, 184/6.12, 184/6.2, 184/103, 123/197 C, 123/41.8 G, 123/196 CP, 123/198 P, 244/135 R, 137/38, 137/899.2
• US Class Current: 74/467
• CPC Class Codes: B64D 35/00 Transmitting power from power plants to propellers or rotors; Arrangements of transmissions
• CPC Class Codes: F02B 61/04 for driving propellers
• CPC Class Codes: F16H 57/027 characterised by means for venting gearboxes, e.g. air breathers
• CPC Class Codes: F16H 57/0443 for supply of lubricant during tilt or high acceleration, e.g. problems related to the tilt or extreme acceleration of the transmission casing and the supply of lubricant under these conditions
• CPC Class Codes: F16H 57/0495 with fixed gear ratio
• CPC Class Codes: Y10T 137/6906 Aerial or water-supported [e.g., airplane or ship, etc.]
• CPC Class Codes: Y10T 74/19991 Lubrication

Abstract

A speed-reduction transmission for a reciprocating piston aircraft engine, in which the oil-collecting space of the speed-reduction transmission housing arranged between the piston engine and the propeller is connected with the oil-collecting space of the crankcase of the engine by way of an overflow pipe; the upper part of the speed-reduction transmission housing is in communication with the air space of the crankcase by way of a vent pipe; the vent pipe and the overflow pipe are so arranged that their functions are interchanged during upside-down flights of the aircraft and the oil volume disposed in the bottom of the transmission housing remains constant.

Claims

1. A lubrication arrangement for a reduction gear for a reciprocating piston engine in an aircraft, comprising a transmission housing means, an oil-collecting space means formed in the lower part of the transmission housing means, an engine crankcase means with an oil-collecting space means, an overflow channel means connecting the oil-collecting space means of the transmission housing means with the oil-collecting space means of the engine crankcase means, and a vent channel means initiating in an upper part of the transmission housing means and terminating in an air space of the crankcase means, the vent channel means and the overflow channel means being dimensioned and arranged relative to one another, the transmission housing means, and the engine crankcase means in a manner such that their functions are mutually interchangeable during upside-down flights of the aircraft.

2. A lubrication arrangement for a reduction gear according to claim 1, wherein the vent channel means is spaced approximately the same distance to the highest place of the interior space of the transmission housing means as the overflow channel means to the lowest place thereof so that the oil-filling is approximately the same during normal and upside-down flights.

3. A lubrication arrangement for a reduction gear according to claim 2, wherein the vent channel means is operatively connected with an oil leakage line of a hydraulic propeller governor by way of a branch line.

5. A lubricating arrangement for a reduction gear according to claim 10 wherein the vent channel means is spaced approximately the same distance to the highest place of the interior space of the transmission housing means as the overflow channel means to the lowest place thereof so that the oil-filling volume is approximately the same during normal and upside-down flights.

6. A lubrication arrangement for a reduction gear according to claim 5, wherein the vent channel means is operatively connected with an oil leakage line of a hydraulic propeller governor by way of a branch line.

7. A lubrication arrangement for a reduction gear according to claim 6, wherein pipes of substantially the same diameter are used for the vent channel means and the overflow channel means, said pipes extending into the interior space of the transmission housing means and into the crankcase means and being retained and sealed by threaded bush means.

8. A lubrication arrangement for a reduction gear according to claim 1, wherein the vent channel means is operatively connected with an oil leakage line of a hydraulic propeller governor by way of a branch line.

9. A lubrication arrangement for a reduction gear according to claim 8, wherein pipes of substantially the same diameter are used for the vent channel means and the overflow channel means, said pipes extending into the interior space of the transmission housing means and into the crankcase means and being retained and sealed by threaded bush means.

10. A lubrication arrangement for a reduction gear according to claim 1, wherein pipes of substantially the same diameter are used for the vent channel means and the overflow channel means, said pipes extending into the interior space of the transmission housing means and into the crankcase means and being retained and sealed by threaded bush means.

4. A lubrication arrangement for a reduction gear according to claim 4, wherein pipes of the same diameter are used for the vent channel means and the overflow channel means, said pipes extending into the interior space of the transmission housing means and into the crankcase means and being retained and sealed by threaded bush means.