US 12,227,277 B2
Marine propulsion device, propeller unit, and method
Isao Tateishi, Shizuoka (JP)
Assigned to YAMAHA HATSUDOKI KABUSHIKI KAISHA, Shizuoka (JP)
Filed by YAMAHA HATSUDOKI KABUSHIKI KAISHA, Iwata (JP)
Filed on Sep. 29, 2022, as Appl. No. 17/955,598.
Claims priority of application No. 2021-163566 (JP), filed on Oct. 4, 2021.
Prior Publication US 2023/0109555 A1, Apr. 6, 2023
Int. Cl. B63H 1/15 (2006.01); B63H 23/34 (2006.01)
CPC B63H 1/15 (2013.01) [B63H 23/34 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A marine propulsion device comprising:
a propeller including an inner tubular portion, an outer tubular portion outside the inner tubular portion, and a plurality of blades on an outer peripheral surface of the outer tubular portion;
a propeller shaft to support the propeller, the propeller shaft extending in a back-and-forth direction from a front end connected to a shift mechanism to a rear end connected to the propeller;
a bushing between the inner tubular portion of the propeller and the propeller shaft and unitarily rotatable with the propeller shaft;
a damper fixed to the bushing to transmit rotation of the propeller shaft to the propeller; and
a spacer spaced apart from the inner tubular portion of the propeller in the back-and-forth direction and in front of the bushing in the back-and-forth direction to position the bushing in place with respect to the propeller shaft.