Method of machining gears

A method of machining a tooth flank of a gear with a tool, said method comprising:

• rotating said tool and bringing said tool and said tooth flank into contact,
• providing relative movement between said tool and said gear to traverse said tool across said tooth flank along a path,
• whereby said path produces a tooth flank geometry of a form which, when brought into mesh with a mating tooth flank under no load or light load to form a tooth pair, provides a motion graph curve describing contact between respective tooth flanks of said tooth pair from an initial entrance into mesh to a final exit from mesh as being over a gear rotation amount of greater than 1.0 pitch.

A method of machining a tooth flank of a gear with a tool, said method comprising:

• rotating said tool and bringing said tool and said tooth flank into contact,
• providing relative movement between said tool and said gear to traverse said tool across said tooth flank along a path,
• whereby said path produces a tooth flank geometry of a form which, when brought into mesh with a mating tooth flank under no load or light load to form a tooth pair, provides a motion graph curve describing contact between respective tooth flanks of said tooth pair comprising two or more entrances into mesh and two or more exits from mesh over a gear rotation amount of 1.0 pitch.

A gear having a plurality of tooth flank surfaces with at least one tooth flank surface having a tooth flank geometry of a form which, when brought into mesh under no load or light load with a mating tooth flank to form a tooth pair, provides a motion graph curve that intersects, at least two times, a motion graph curve of at least one of an immediately preceding tooth pair and an immediately following tooth pair.