The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 02, 2002
Filed:
Aug. 12, 1998
Hidemi Matsuda, Tochigi-Ken, JP;
Hideteru Yamamoto, Utsunomiya, JP;
Fuji Jukogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
The disclosed helicopter power transmitting apparatus can transmit rotational torque of one engine input to a largediameter gear ( ) linked with a main rotor driving shaft ( ) through a pair of gear trains securely and uniformly. The helicopter power transmitting apparatus comprises a largediameter gear ( ); first and second smalldiameter gears ( ) both having the same diameter and the same number of teeth in mesh with the largediameter gear; a first largediameter helical gear ( ) linked with the first smalldiameter gear ( ) via a first shaft ( ) over the first smalldiameter gear ( ); a second largediameter helical gear ( ) linked with the second smalldiameter gear ( ) via a second shaft ( ) under the second smalldiameter gear ( ); an input shaft ( ) arranged roughly in parallel to the first and second shafts ( ); an outer cylinder ( ) slidably fitted to an outside of the input shaft ( ); and first and second smalldiameter helical gears ( ) fixed to both upper and lower ends of the outer cylinder in mesh with the first and second largediameter helical gears ( ), respectively. In particular, the first and second shafts ( ) have such flexural rigidity relationship as to substantially eliminate a phase difference between the first and second smalldiameter gears ( ), against the unbalanced forces applied to the first and second shafts ( ), respectively when the first and second smalldiameter gears ( ) transmit the same torque to the largediameter gear ( ).