VIBRATION ABSORBING DEVICE FOR ROTORCRAFT

• US 3,836,098 A
• Filed: 03/03/1972
• Issued: 09/17/1974
• Est. Priority Date: 03/08/1971
• Status: Expired due to Term

• Current Assignee: Junichi Miyashita
• Original Assignee: Junichi Miyashita
• Inventors: Miyashita, Junichi
• Primary Examiner(s): Halvosa, George E. A.
• Assistant Examiner(s): Sauberer, Paul E.
• Application Number:
  US05/231,477
• Time in Patent Office: 928 Days
• Field of Search: 244/17.25,17.27,17.11,17.23 188/1B 248/358R 416/500
• US Class Current: 244/17.27
• CPC Class Codes: B64C 2027/002 mounted between the rotor drive and the fuselage
• CPC Class Codes: B64C 2027/005 using suspended masses
• CPC Class Codes: B64C 27/001 Vibration damping devices
• CPC Class Codes: F16F 7/1017 by fluid means
• CPC Class Codes: Y10S 416/50 Vibration damping features

Abstract

In a vibration absorbing device for rotorcraft, of the type having at least one vibration weight provided in the proximity of a structural member of the rotorcraft through which exciting forces are transmitted to the fuselage, and arranged in such a position and direction of vibration that a selected one of a plurality of forces and moment exciting forces may be offset by the force of inertia of said vibration weight, hydraulic means for imparting vibrations to said vibration weight and means for controlling said hydraulic means to impart desired vibrations to said vibration weight are provided.

Claims

1. For use in rotary wing vehicles having rotors and means driving said rotors, a vibration absorbing apparatus, comprising:

a structural member through which exciting forces are transmitted to the fuselage of said rotary wing vehicle;

means coupling said structural member to said vehicle;

a vibration weight;

means coupling said vibration weight to said structural member in a position and direction of vibration to offset a selected one of a plurality of said exciting forces by the inertia of said vibration weight, said vibration weight coupling means including a resilient member interposed between and coupled to said vibration weight and said structural member;

driving means coupled to saiD structural member for imparting vibrations to said vibration weight through said structural member and said resilient member; and

control means for controlling said driving means to control the vibrations imparted to said vibration weight.

2. The vibration absorbing apparatus according to claim 1, wherein said structural member comprises a spring lever having one end portion fixedly coupled to a housing of said vehicle and an opposite end portion coupled to said vibration weight driving means;

and wherein said vibration weight is coupled through said interposed resilient member to an intermediate portion of said spring lever.

3. The vibration absorbing apparatus according to claim 1, wherein said structural member comprises a lever coupled to a housing of said vehicle;

said vibration weight driving means being coupled to said lever, and said vibration weight being coupled to said lever through said interposed resilient member.