US 12,247,639 B2
Toothed belt and belt transmission mechanism
Norihito Suzuki, Hyogo (JP); and Masakuni Yoshida, Hyogo (JP)
Assigned to Mitsuboshi Belting Ltd., Kobe (JP)
Appl. No. 18/288,343
Filed by Mitsuboshi Belting Ltd., Kobe (JP)
PCT Filed Apr. 21, 2022, PCT No. PCT/JP2022/018492
§ 371(c)(1), (2) Date Oct. 25, 2023,
PCT Pub. No. WO2022/230762, PCT Pub. Date Nov. 3, 2022.
Claims priority of application No. 2021-075222 (JP), filed on Apr. 27, 2021; application No. 2021-110816 (JP), filed on Jul. 2, 2021; and application No. 2022-066929 (JP), filed on Apr. 14, 2022.
Prior Publication US 2024/0200635 A1, Jun. 20, 2024
Int. Cl. F16G 1/28 (2006.01); F16H 7/02 (2006.01)
CPC F16G 1/28 (2013.01) [F16H 7/023 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A toothed belt comprising:
a back portion;
at least one tension member embedded in the back portion;
a plurality of tooth portions arranged at a predetermined interval along a belt longitudinal direction on one surface of the back portion; and
a tooth cloth covering a surface of the tooth portions and a part of the one surface of the back portion, wherein
the at least one tension member is a twisted cord comprising a high-strength glass fiber filament,
a tooth pitch between the tooth portions is 2.0 mm or more and 2.5 mm or less,
a diameter of the at least one tension member is 0.15 mm or more and less than 0.30 mm,
a ratio of a thickness of the back portion to a thickness of the toothed belt is 22.0% or more and 38.5% or less,
the tooth portions are constituted of a rubber composition,
a hardness of the rubber composition at 23° C. is 73° or more and 83° or less, and
each of the tooth portions has a shape where a tooth tip portion and two side surfaces sandwiching the tooth tip portion in the belt longitudinal direction are joined together with one or two or more curved surfaces having a fixed curvature.