Standby generator alternator adapter with engine cooling air intake

1. An alternator adapter for a generator engine comprising:

a main body defining an airflow chamber, the main body comprising:

an airflow outlet in a first end of the main body,

an engine shaft opening in a second end of the main body opposite the first end, and

an airflow inlet between the first end and the second end;

an engine mount coupled to the first end of the main body around the airflow outlet, the engine mount aligned with the engine shaft opening; and

an alternator mount coupled to the second end of the main body around the engine shaft opening.

2. The alternator adapter of claim 1 further comprising a plurality of engine mounting projections extending outward from the engine mount, and a plurality of alternator mounting projections extending outward from the alternator mount; and

wherein each of the plurality of engine mounting projections are angularly offset from each of the plurality of alternator mounting projections.

3. The alternator adapter of claim 1 wherein the alternator mount surrounds a chamber wall having the engine shaft opening formed therein, the chamber wall blocking airflow through the alternator mount.

4. The alternator adapter of claim 3 wherein the airflow inlet is perpendicular to the airflow outlet and is positioned between the chamber wall and the airflow outlet.

5. The alternator adapter of claim 1 further comprising an inlet air duct coupled to the airflow inlet and extending outward from the main body.

6. The alternator adapter of claim 5 further comprising a support member extending across an interior of the inlet air duct from the alternator mount to the engine mount with an opening for a fastener to couple the generator engine.

7. The alternator adapter of claim 5 wherein the main body comprises a cylindrical outer casing holding the engine mount and the alternator mount at opposite ends of the cylindrical outer casing, and wherein the inlet air duct comprises a generally rectangular shape having a pair of opposing sides curving into the cylindrical outer casing.

8. The alternator adapter of claim 7 wherein the airflow inlet is formed in the cylindrical outer casing at a location between the first and second ends, with the airflow inlet being perpendicular to the airflow outlet.

9. The alternator adapter of claim 7 wherein the cylindrical outer casing comprises an oblong cylindrical outer casing, and the alternator mount comprises a circular outer ridge to receive an alternator housing.

10. An engine-generator set comprising:

a coupling for a generator comprising:

an engine mount comprising an airflow opening,

a generator mount, and

a spacer section holding the engine mount aligned with the generator mount in a spaced relationship allowing airflow into the coupling and to the airflow opening; and

an air-cooled engine coupled to the engine mount, the air-cooled engine comprising:

a crankshaft extending through the airflow opening, and

an engine fan coupled to the crankshaft on a side of the air-cooled engine facing the coupling; and

a generator coupled to the generator mount outside of the spacer section and driven by the crankshaft, the generator comprising a generator drive shaft that extends through an opening formed in the generator mount to couple with the crankshaft within an interior volume of the coupling.

11. The engine-generator set of claim 10 wherein the spacer section comprises:

an outer enclosure surrounding the crankshaft extending from the engine mount to the generator mount, and

an inlet air duct extending outward from the outer enclosure and in fluid communication with the airflow opening.

12. The engine-generator set of claim 11 wherein the outer enclosure and the generator mount provide an airflow path from the inlet air duct to the airflow opening.

13. The engine-generator set of claim 11 wherein the inlet air duct extends from the outer enclosure perpendicular to the crankshaft.

14. The engine-generator set of claim 13 further comprising a support arm extending across an interior of the inlet air duct, the support arm having a fastening receptacle to couple the air-cooled engine to the coupling.

15. The engine-generator set of claim 11 wherein the engine fan is positioned in a flow path from the airflow opening, so as to draw an airflow through the inlet air duct, into an interior volume of the spacer section, and out through the airflow opening.

16. The engine-generator set of claim 15 wherein the air-cooled engine comprises a v-twin engine having two cylinders; and

further comprising an engine fan cover mounted over the engine fan to direct cooling air from the engine fan over the two cylinders.

17. An alternator adapter for an air-cooled engine comprising: an engine mount comprising a cooling air opening formed therein; a generator mount; and a frame comprising an outer casing holding the engine mount aligned with the generator mount, the outer casing comprising an airflow inlet fluidically connected to the cooling air opening to allow flow of engine cooling air through the adapter wherein the generator mount comprises an adapter wall having an engine shaft opening formed therein aligned with the cooling air opening, the adapter wall blocking airflow through the generator mount, and wherein the airflow inlet is perpendicular to the cooling air opening and is positioned between the adapter wall and the cooling air opening.

18. The alternator adapter of claim 17 wherein the outer casing extends from the engine mount to the generator mount.

19. The alternator adapter of claim 18 further comprising an inlet air duct coupled to the airflow inlet and extending outward from the outer casing.

20. The alternator adapter of claim 19 wherein the frame comprises a cylinder having the inlet air duct extending outward from a side of the cylinder.

21. The alternator adapter of claim 17 wherein the cooling air opening has a cross-sectional area larger than an opposing cross-sectional area of the generator mount.