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US3698663A Expired / Lapsed US ⏱️ 0.0 years remaining

Rotary wing pylon mounting system

Assignee: Bell Helicopter Textron Inc
•
Filing: 1970-12-07
•
Granted: 1972-10-17
•
Expires: 1990-12-07
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Abstract

Abstract A pylon mounting system that employs four non-resilient links to support the pylon on the fuselage. The top end of each link is mounted by spherical bearings to the pylon. The bottom end of each link is mounted by spherical bearings to the fuselage. The longitudinal axes of the links intersect at a predetermined point along the mast axis below or above the normal mounting plane. The pylon is thus constrained by the four links to execute small, vibrational motions about this point of intersection. As a consequence, in-plane vibrational forces from the rotor blades are transmitted to the fuselage as an in-plane vibrational force at this point of intersection. A first moment about the center of gravity of the fuselage is created by this in-plane focused force. In addition, there are elastomeric elements between the fuselage and the pylon which provide an in-plane restoring force in response to rotor blade induced pylon vibrations. This restoring force provides a second moment about the fuselage center of gravity. The point of intersection of the links and of the spring rate of the elastomeric elements are selected such that these first and second moments tend to cancel one another. Pylon inertial reaction is enhanced because the pylon rotates about this point of intersection. Thus, isolation of the fuselage is enhanced.

Inventors

  • 👤 Rodney Worth Balke
  • 👤 Robert Reed Lynn
  • 👤 Rodney Keith Wernicke

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-29 12:41
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/001; B64C2027/002

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 176 words
In a rotary wing aircraft having rotor blades mounted on a rotor shaft, a pylon mounting system for mounting the pylon on the fuselage comprising: at least three separate non-resilient mounting links spaced from one another and connected between the pylon and the fuselage to support the pylon on the fuselage, a plurality of universal bearings, one of said universal bearings at each end of each of said links to provide a universal coupling between a first end of each of said links and the pylon and to provide a universal coupling between a second end of each of said links and the fuselage, the longitudinal axis of each of said mounting links intersecting at a predetermined point, said pylon reacting to in-plane forces by tending to rotate about said predetermined point, elastomeric element means connected between the pylon and the fuselage to provide a restoring force upon deflection of the pylon relative to the fuselage, and torque restraining means connected between the pylon and the fuselage to prevent pylon rotation about the rotor shaft axis.
Claim 2
Dependent Claim 176 words
In a rotary wing aircraft having rotor blades mounted on a rotor shaft, a pylon mounting system for mounting the pylon on the fuselage comprising: at least three separate non-resilient mounting links spaced from one another and connected between the pylon and the fuselage to support the pylon on the fuselage, a plurality of universal bearings, one of said universal bearings at each end of each of said links to provide a universal coupling between a first end of each of said links and the pylon and to provide a universal coupling between a second end of each of said links and the fuselage, the longitudinal axis of each of said mounting links intersecting at a predetermined point, said pylon reacting to in-plane forces by tending to rotate about said predetermined point, elastomeric element means connected between the pylon and the fuselage to provide a restoring force upon deflection of the pylon relative to the fuselage, and torque restraining means connected between the pylon and the fuselage to prevent pylon rotation about the rotor shaft axis.
Claim 3
Dependent Claim 22 words
The pylon mounting system of claim 1 wherein said predetermined point of intersection is below the center of gravity of the fuselage.
Claim 4
Dependent Claim 59 words
The pylon mounting system of claim 2 wherein: said restoring force provided by said elastomeric element means provides a moment about the center of gravity of the fuselage that is substantially equal in magnitude and opposite in direction to the moment about the center of gravity of the fuselage of whatever in-plane force is focused at said predetermined point.
Claim 5
Dependent Claim 22 words
The pylon mounting system of claim 3 wherein said predetermined point of intersection is substantially in line with the rotor shaft axis.
Claim 6
Dependent Claim 22 words
The pylon mounting system of claim 2 wherein said predetermined point of intersection is substantially in line with the rotor shaft axis.
Claim 7
Dependent Claim 59 words
The pylon mounting system of claim 1 wherein: said restoring force provided by said elastomeric element means provides a moment about the center of gravity of the fuselage that is substantially equal in magnitude and opposite in direction to the moment about the center of gravity of the fuselage of whatever in-plane force is focused at said predetermined point.
Claim 8
Dependent Claim 22 words
The pylon mounting system of claim 6 wherein said predetermined point of intersection is substantially in line with the rotor shaft axis.
Claim 9
Dependent Claim 22 words
The pylon mounting system of claim 1 wherein said predetermined point of intersection is substantially in line with the rotor shaft axis.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-10-17 1976-04-17 1976-10-17 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-10-17 1980-04-17 1980-10-17 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-10-17 1984-04-17 1984-10-17 $7700.00 Window Closed / Lapsed

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