Drive train with a single diametral pitch pinion driving two gears with different diametral pitches
AssigneeBombardier Motor Corporation of America
InventorsJeffrey P. Higby, Laverne W. Tatge
Life of this patent
Estimating the term…
Abstract
A marine propulsion unit drive train including two oppositely facing driven bevel gears having a common rotational axis and different numbers of teeth engaged with a bevel pinion drive gear having a single diametral pitch. Both driven gears have the same pitch diameter but different diametral pitches so that the driven gears rotate at different rates to boost performance when the propulsion unit is operated. The drive train is applicable to single propeller marine propulsion units and dual propeller stem drive units, and a method for fabricating a reduced-tooth driven gear to mesh with a drive pinion of a different diametral pitch is disclosed.
Claims31
A drive train comprising:
- a bevel drive pinion gear having a single number of teeth and a diametral pitch;
- a first driven gear engaged with said pinion gear for rotation about an axis said first driven gear having a first number of teeth and a first diametral pitch;
- a second driven gear engaged with said pinion gear for rotation about said axis, said second driven gear having a second number of teeth and a second diametral pitch, said second diametral pitch different than said first diametral pitch.
A marine propulsion unit drive train comprising:
- a driveshaft;
- a bevel pinion drive gear attached to said driveshaft, said pinion gear comprising a plurality of teeth of a single pitch diameter;
- a first driven gear comprising a plurality of teeth and a second diametral pitch, said teeth of said first driven gear engageable with said teeth of said pinion gear for rotation in a first rotational direction about an axis of rotation;
- a first propeller shaft attached to said first driven gear;
- a second driven gear comprising a plurality of teeth and a third pitch diameter, said teeth of said second driven gear engageable with said gear teeth of said pinion gear for rotation in a second rotational direction about said axis of rotation, said third diametral pitch different from said second diametral pitch, and
- a second propeller shaft attached to said second gear.
A marine propulsion device comprising:
- a driving bevel pinion gear with a single set of gear teeth;
- a first facing driven bevel gear engaged with said driving gear for rotation about an axis, said first facing driven gear comprising a first number of teeth and a first diametral pitch;
- a second facing driven bevel gear engaged with said driving gear for rotation about said axis and located opposite of said first facing driven gear, said second facing driven gear comprising a second number of teeth and a second diametral pitch;
- said first diametral pitch different from said second diametral pitch;
- and
- at least one propeller shaft configured for selective coupling to at least one of said first driven gear and said second driven gear.
A marine propulsion device comprising:
- a driveshaft;
- and
- a gear case comprising:
- a driving bevel pinion gear affixed to said driveshaft and having a single set of gear teeth;
- a first facing rotating driven bevel gear engaged with said driving gear, said first facing driven gear comprising a first number of teeth and a first diametral pitch;
- a second facing rotating driven bevel gear located opposite of said first facing driven gear, said second facing driven gear comprising a second number of teeth and a second diametral pitch, said first diametral pitch different from said second diametral pitch;
- and
- a propeller shaft driven by one of said first facing driven gear and said second facing driven gear.
Dependencies are inferred from the claim text.