US 12,031,620 B2
Sprocket and chain drive system
Shoichiro Shimizu, Osaka (JP); Yuta Watanabe, Osaka (JP); and Akira Hirai, Osaka (JP)
Assigned to TSUBAKIMOTO CHAIN CO., Osaka (JP)
Filed by TSUBAKIMOTO CHAIN CO., Osaka (JP)
Filed on Aug. 14, 2023, as Appl. No. 18/233,425.
Claims priority of application No. 2022-144434 (JP), filed on Sep. 12, 2022; and application No. 2023-002492 (JP), filed on Jan. 11, 2023.
Prior Publication US 2024/0084885 A1, Mar. 14, 2024
Int. Cl. F16H 55/30 (2006.01); F16H 7/06 (2006.01); F16H 55/06 (2006.01); F16H 55/08 (2006.01); F16H 57/04 (2010.01)
CPC F16H 55/30 (2013.01) [F16H 55/088 (2013.01); F16H 57/0495 (2013.01); F16H 7/06 (2013.01); F16H 55/06 (2013.01); F16H 2055/086 (2013.01); F16H 2055/306 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A sprocket having a plurality of teeth that mesh with a chain,
the plurality of teeth being designed with a waveform phase variation pattern that causes phasing to advance and retard in relation to a zero phase of engagement between equidistant teeth and a chain,
some of tooth roots between adjacent teeth being deviated radially away from a root circle of a standard tooth profile,
a maximum root deviation being set within a range of 2 to 7% of a tooth pitch of the teeth,
the phase variation pattern being created by changing root radii in accordance with angular positions, the waveform phase variation pattern having an amplitude that is varied within a range of (1/7)Amax, where Amax represents a maximum amplitude.