US 11,668,386 B2
Pulley structure
Hayato Shimamura, Hyogo (JP); Katsuya Imai, Hyogo (JP); Ryosuke Dan, Hyogo (JP); and Takashi Morimoto, Hyogo (JP)
Assigned to Mitsuboshi Belting Ltd., Kobe (JP)
Appl. No. 16/603,304
Filed by Mitsuboshi Belting Ltd., Kobe (JP)
PCT Filed Apr. 17, 2018, PCT No. PCT/JP2018/015921
§ 371(c)(1), (2) Date Oct. 7, 2019,
PCT Pub. No. WO2018/194075, PCT Pub. Date Oct. 25, 2018.
Claims priority of application No. JP2017-082495 (JP), filed on Apr. 19, 2017; and application No. JP2018-070956 (JP), filed on Apr. 2, 2018.
Prior Publication US 2021/0102614 A1, Apr. 8, 2021
Int. Cl. F16H 55/36 (2006.01); F02B 67/06 (2006.01); F16D 41/20 (2006.01); F16D 7/02 (2006.01); F16D 13/08 (2006.01); F16D 13/12 (2006.01); F16D 13/14 (2006.01); F02B 63/04 (2006.01); F16F 1/06 (2006.01); F16F 15/121 (2006.01)
CPC F16H 55/36 (2013.01) [F02B 67/06 (2013.01); F16D 7/022 (2013.01); F16D 13/08 (2013.01); F16D 13/12 (2013.01); F16D 13/14 (2013.01); F16D 41/206 (2013.01); F02B 63/042 (2013.01); F16F 1/06 (2013.01); F16F 15/1216 (2013.01); F16F 2228/001 (2013.01); F16F 2232/02 (2013.01); F16F 2234/02 (2013.01); F16F 2236/085 (2013.01); F16F 2238/024 (2013.01); F16H 2055/366 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A pulley structure comprising:
a cylindrical outer rotating body around which a belt is to be wound;
an inner rotating body provided on a radial inside of the outer rotating body and relatively rotatable with respect to the outer rotating body around a common rotation axis with the outer rotating body; and
a coil spring provided between the outer rotating body and the inner rotating body and compressed in an axial direction along the common rotation axis,
wherein the coil spring is configured to be engaged with the outer rotating body and the inner rotating body due to torsional deformation in a diameter expansion or diameter reduction direction to transmit torque between the outer rotating body and the inner rotating body, and is configured to come into a disengaged state in which the coil spring slides with respect to the outer rotating body or the inner rotating body due to torsional deformation in a direction opposite to the direction when the torque is transmitted, so as to block the transmission of torque between the outer rotating body and the inner rotating body, and
wherein the coil spring has a number of windings within a range of M-0.669 or more and less than M, where M is a natural number.