Fuji Jukogyo Kabushiki Kaisha

Hidemi Matsuda

Toru Nagao

Hideteru Yamamoto

Takao Kojima

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 ( ).

Helicopter power transmitting apparatus

A jacket having a pair of small helical gears is spline-fitted around a splined shaft. Since the small helical gears have an adverse helix angle to each other, the jacket moves along the spline shaft in the axial direction so as to distribute an equal torque to both small helical gears. The splited torque is transmitted to a pair of drive shafts each of which drives the main rotor of a helicopter through a combination of gear and pinion. The drive shafts are fixed axially and therefore helical gears or double-helical gears can be used in the combination of gear and pinion. Consequently the power transmission apparatus according to the present invention provides a light and compact structure,

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Tochigi-ken, Japan

Hidemi Matsuda