US 7,581,695 B2Granted

Aircraft with a modified gear, and method of producing the gear

AssigneeAgusta S.p.A.

InventorsGiuseppe Gasparini, Sergio Sartori, Nihat Yildirim

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Abstract

There is described a helicopter having a transmission for transmitting motion from a driving member to a driven member; the transmission has at least a first gear driven by the driving member, and a second gear meshing with the first gear and in turn driving the driven member; the first and second gear have teeth shaped so that the gears mesh with one another at at least two pairs of respective simultaneously meshing teeth; the teeth of at least one of the gears have a profile having an end portion relieved with respect to a starting theoretical involute; and the pattern of the distance between the points of the end portion and the starting involute along an axis of the tooth has at least a first and a second segment sloping with respect to each other.

Claims8

Dependent claims

An aircraft (1) comprising:

a transmission (5) for transmitting motion from a driving member to a driven member;
said transmission (5) comprising a first gear (8;
10) driven by said driving member and a second gear (10;
12) meshing with said first gear (8;
10) and in turn driving said driven member;
each of said first and said second gears (8, 10;
10, 12) having teeth (16, 17, 18) shaped so that said first and second gears (8, 10) mesh with one another at at least two pairs of respective simultaneously meshing teeth (16, 17;
17, 18);
each of said teeth (16, 17, 18) of at least one of said first and second gears (8, 10, 12) has a profile (19) comprising a root portion (20) in the form of a starting theoretical involute (E) and an end portion (21) relieved with respect to said starting theoretical involute (E);
a pattern (G) of the distance between the points of said end portion (21) and said starting theoretical involute (E) along an axis (A, H) of said tooth (16, 17, 18) comprising at least a first segment (B) and a second segment (C) sloping with respect to each other and with respect to said starting theoretical involute (E).

7 more elements

Dependencies are inferred from the claim text.