Rotation transmission device

Patent metadata

Field	Value
Publication number	US-2016348740-A1
Application number	US-201515116571-A
Country	US
Kind code	A1
Filing date	Feb 2, 2015
Priority date	Feb 4, 2014
Publication date	Dec 1, 2016
Grant date	—

Abstract

A rotation transmission device is provided in which an electromagnetic clutch selectively engages and disengages a two-way clutch configured to selectively perform and stop the transmission of torque between an input shaft and an output shaft. A spring holder fitted on the input shaft prevents rollers from axially moving. Spring holding pieces mounted to the spring holder are formed with respective engagement surface engaging with cam surfaces of the outer periphery of an inner ring such that the spring holder is rotationally fixed. Since it is not necessary to machine the input shaft just for the purpose of rotationally fixing the spring holder, it is possible to reduce costs.

First claim

1 . A rotation transmission device comprising:
a two-way clutch configured to selectively perform and stop transmission of torque between an input shaft and an output shaft arranged coaxially with the input shaft; and an electromagnetic clutch including an electromagnet, and configured to selectively engage and disengage the two-way clutch, wherein the two-way clutch comprises: an outer ring provided at an end portion of the output shaft; an inner ring provided at an end portion of the input shaft; a control retainer having pillars; and a rotary retainer having pillars; wherein the pillars of the control retainer and the pillars of the rotary retainer are arranged between an inner periphery of the outer ring and an outer periphery of the inner ring such that the pillars of the control retainer circumferentially alternate with the pillars of the rotary retainer; wherein pockets are defined between adjacent ones of the pillars of the control retainer and the pillars of the rotary retainer, wherein the two-way clutch further comprises: a plurality of pairs of rollers, each pair being mounted in each of the pockets so as to be engageable with a cylindrical surface formed on the inner periphery of the outer ring and each of cam surfaces formed on the outer periphery of the inner ring; and elastic members each mounted in each of the pockets and biasing the corresponding pair of rollers in a direction away from each other, wherein the rotation transmission device further comprises a spring holder for restricting an axial movement of the rollers, the spring holder being fitted on the input shaft and abutting one of two axial end surfaces of the inner ring so as to be rotationally fixed and axially positioned, wherein the spring holder is formed on an outer periphery of the spring holder with a plurality of spring holding pieces extending to overhang the respective elastic members, and wherein the rotation transmission device is configured such that when the electromagnet of the electromagnetic clutch is energized, and the control retainer axially moves, the control retainer and the rotary retainer rotate relative to each other in a direction in which circumferential widths of the respective pockets decrease, so that the rollers are disengaged from the inner periphery of the outer ring and the outer periphery of the inner ring, and wherein at least one of the spring holding pieces is formed with an engagement surface engaging with one of the cam surfaces of the inner ring such that the spring holder is rotationally fixed.

2 . The rotation transmission device according to claim 1 , wherein the spring holder is provided on the outer periphery of the spring holder with a plurality of extension arms axially extending along an outer peripheral surface of the inner ring, and
wherein the extension arms have, respectively, distal ends engaged with the other of the two axial end surfaces of the inner ring so as to restrict an axial movement of the spring holder.

3 . The rotation transmission device according to claim 2 , wherein the distal ends of the respective extension arms comprise engagement claws engaged with the other of the two axial end surfaces of the inner ring, whereby the extension arms are in engagement with the other of the two axial end surfaces of the inner ring.

4 . The rotation transmission device according to claim 2 , wherein the distal ends of the respective extension arms comprise bent portions engaged, by snap fitting, with the other of the two axial end surfaces of the inner ring, whereby the extension arms are in engagement with the other of the two axial end surfaces of the inner ring.

5 . The rotation transmission device according to claim 2 , wherein the distal ends of the respective extension arms comprise crimped pieces formed by crimping the distal ends, and engaged with the other of the two axial end surfaces of the inner ring, whereby the extension arms are in engagement with the other of the two axial end surfaces of the inner ring.

Assignees

• Ntn Toyo Bearing Co Ltd

Inventors

• KITAYAMA Naotsugu
• Ishikawa Shintaro
• Sato Koji
• Saito Takahide

Classifications

• F16D41/067

  and the members being distributed by a separate cage encircling the axis of rotation · CPC title

• F16D41/088

  the intermediate members being of only one size and wedging by a movement not having an axial component, between inner and outer races, one of which is cylindrical · CPC title

• F16D27/108 Primary

  with axially movable clutching members · CPC title

• F16D41/066

  all members having the same size and only one of the two surfaces being cylindrical · CPC title

• F16D2023/123

  Clutch actuation by cams, ramps or ball-screw mechanisms · CPC title