Pulley Structure

Patent metadata

Field	Value
Publication number	US-2021102614-A1
Application number	US-201816603304-A
Country	US
Kind code	A1
Filing date	Apr 17, 2018
Priority date	Apr 19, 2017
Publication date	Apr 8, 2021
Grant date	—

Abstract

The present invention relates to a pulley structure ( 1 ) equipped with an outer rotating body ( 2 ), an inner rotating body ( 3 ), and a coil spring ( 4 ) provided between the outer rotating body ( 2 ) and the inner rotating body ( 3 ). The coil spring ( 4 ) is configured so as to undergo torsional deformation in a diameter-expanding or a diameter-contracting direction, thereby engaging the outer rotating body ( 2 ) and the inner rotating body ( 3 ) and transmitting torque, and to undergo torsional deformation in the direction opposite the direction in which torque is transmitted, thereby entering a disengaged state in which the coil spring slides with the outer rotating body ( 2 ) or the inner rotating body ( 3 ), thus interrupting the transmission of torque. The number of windings of the coil spring ( 4 ) is in a range between [M-0.125] and M (both inclusive), where M is a natural number.

First claim

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 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 of within a range of [M-0.125] or more and M or less, where M is a natural number.

2 . The pulley structure according to claim 1 , wherein the number of windings of the coil spring is within a range of [M-0.069] or more and M or less.

3 . The pulley structure according to claim 1 , wherein the coil spring has a torsional torque of being set to be 1 N·m or more and 10 N·m or less when the coil spring is in the disengaged state.

4 . The pulley structure according to claim 2 , wherein the coil spring has a torsional torque of being set to be 1 N·m or more and 10 N·m or less when the coil spring is in the disengaged state.

Assignees

• Mitsuboshi Belting Ltd

Inventors

• Shimamura Hayato
• Imai Katsuya
• Dan Ryosuke
• Morimoto Takashi

Classifications

• F16D13/14

  with outwardly-movable clutching members co-operating with the inner surface of a drum or the like (F16D13/02, F16D13/06, F16D13/12 take precedence; similar brakes F16D51/00) · CPC title

• F16D13/12

  with an expansible band or coil co-operating with the inner surface of a drum or the like (F16D13/02 takes precedence; similar brakes F16D51/02) · CPC title

• F16D13/08

  with a helical band or equivalent member, which may be built up from linked parts, with more than one turn embracing a drum or the like, with or without an additional clutch actuating the end of the band (F16D13/02 takes precedence; {similar slip couplings F16D7/022; similar clutches electromagnetically actuated F16D27/025, F16D27/105} ; similar free-wheel clutches F16D41/20; similar brakes F16D49/02) · CPC title

• F16D7/022

  with a helical band or equivalent member co-operating with a cylindrical torque limiting coupling surface · CPC title

• F16D41/206

  having axially adjacent coils, e.g. helical wrap-springs · CPC title