Rotation transmission device

Patent metadata

Field	Value
Publication number	US-2017009821-A1
Application number	US-201515113616-A
Country	US
Kind code	A1
Filing date	Jan 26, 2015
Priority date	Jan 30, 2014
Publication date	Jan 12, 2017
Grant date	—

Abstract

A rotation transmission device is provided in which a collision sound by an armature and a rotor is less likely to occur, and further the armature is stably attracted to the rotor. A buffer is provided between the armature and the rotor. The buffer is constituted by a metal annulus axially movably supported by the armature, and a rubber annulus configured such that as the armature approaches the rotor, the rubber annulus is axially compressed by the metal annulus and the armature. The rubber annulus has different axial thicknesses at different circumferential locations thereof such that when the degree of axial compression of the rubber annulus is large, the rubber annulus is axially compressed in its longer circumferential area than when the degree of axial compression of the rubber annulus is small.

First claim

1 . A rotation transmission device comprising:
an outer ring; an inner member arranged inside of the outer ring, and supported so as to be rotatable relative to the outer ring; engaging elements provided between an inner periphery of the outer ring and an outer periphery of the inner member; an engaging element retainer supported so as to be movable between an engagement position in which the engaging elements are engaged with the outer ring and the inner member such that rotation is transmitted between the outer ring and the inner member through the engaging elements, and a disengagement position in which the engaging elements are disengaged from the outer ring and the inner member such that the rotation is not transmitted between the outer ring and the inner member; an armature supported so as to be axially movable; a rotor supported so as to be axially unmovable, and axially opposed to the armature; a spring member biasing the armature away from the rotor; an electromagnet configured to attract the armature to the rotor when the electromagnet is energized; and a motion converting mechanism configured to convert a motion of the armature when attracted to the rotor into a movement of the engaging element retainer from one of the engagement position and the disengagement position to the other of the engagement position and the disengagement position, wherein the rotation transmission device further comprises a buffer provided between the armature and the rotor so as to absorb a shock generated when the armature is attracted to the rotor, wherein the buffer comprises a metal annulus axially movably supported by one of the armature and the rotor, and a rubber annulus provided between the metal annulus and said one of the armature and the rotor such that as the armature approaches the rotor, the rubber annulus is axially compressed by the metal annulus and said one of the armature and the rotor, and wherein the rubber annulus has different axial thicknesses at different circumferential locations of the rubber annulus such that when a degree of axial compression of the rubber annulus is large, the rubber annulus is axially compressed in a longer circumferential area of the rubber annulus than when the degree of axial compression of the rubber annulus is small.

2 . The rotation transmission device according to claim 1 , wherein the rubber annulus comprises:
an annular base portion having a uniform axial thickness; a plurality of first protrusions axially protruding from circumferentially spaced apart locations of the base portion; and a plurality of second protrusions axially protruding from circumferentially spaced apart locations of the base portion and lower in height than the first protrusions.

3 . The rotation transmission device according to claim 2 , wherein the second protrusions circumferentially alternate with, and are circumferentially spaced from, the first protrusions such that low portions which are lower in height than the second protrusions are defined between the first protrusions and the respective second protrusions.

4 . The rotation transmission device according to claim 2 , wherein the first protrusions are circumferentially equidistantly spaced apart from each other, and the second protrusions are circumferentially equidistantly spaced apart from each other.

5 . The rotation transmission device according to 4 claim 1 , wherein the metal annulus comprises:
an annular plate portion to which the rubber annulus is fixedly bonded; and an outer side tubular portion axially extending from an outer edge of the annular plate portion so as to cover an outer diameter side of the rubber annulus.

6 . The rotation transmission device according to claim 5 , wherein the metal annulus further comprises an annular inner side protrusion extending from an inner edge of the annular plate portion toward a side on which the rubber annulus is arranged.

7 . The rotation transmission device according to claim 3 , wherein the first protrusions are circumferentially equidistantly spaced apart from each other, and the second protrusions are circumferentially equidistantly spaced apart from each other.

8 . The rotation transmission device according to claim 2 , wherein the metal annulus comprises:
an annular plate portion to which the rubber annulus is fixedly bonded; and an outer side tubular portion axially extending from an outer edge of the annular plate portion so as to cover an outer diameter side of the rubber annulus.

9 . The rotation transmission device according to claim 3 , wherein the metal annulus comprises:
an annular plate portion to which the rubber annulus is fixedly bonded; and an outer side tubular portion axially extending from an outer edge of the annular plate portion so as to cover an outer diameter side of the rubber annulus.

10 . The rotation transmission device according to claim 4 , wherein the metal annulus comprises:
an annular plate portion to which the rubber annulus is fixedly bonded; and an outer side tubular portion axially extending from an outer edge of the annular plate portion so as to cover an outer diameter side of the rubber annulus.

11 . The rotation transmission device according to claim 7 , wherein the metal annulus comprises:
an annular plate portion to which the rubber annulus is fixedly bonded; and an outer side tubular portion axially extending from an outer edge of the annular plate portion so as to cover an outer diameter side of the rubber annulus.

12 . The rotation transmission device according to claim 8 , wherein the metal annulus further comprises an annular inner side protrusion extending from an inner edge of the annular plate portion toward a side on which the rubber annulus is arranged.

13 . The rotation transmission device according to claim 9 , wherein the metal annulus further comprises an annular inner side protrusion extending from an inner edge of the annular plate portion toward a side on which the rubber annulus is arranged.

14 . The rotation transmission device according to claim 10 , wherein the metal annulus further comprises an annular inner side protrusion extending from an inner edge of the annular plate portion toward a side on which the rubber annulus is arranged.

15 . The rotation transmission device according to claim 11 , wherein the metal annulus further comprises an annular inner side protrusion extending from an inner edge of the annular plate portion toward a side on which the rubber annulus is arranged.

Assignees

• Ntn Toyo Bearing Co Ltd

Inventors

• FUKUNARI Marina
• Saito Takahide
• Sato Koji
• Tokuda Makoto
• Sasanuma Kyohei
• TADA Motohiro
• KITAYAMA Naotsugu

Classifications

• F16D27/14

  Details · CPC title

• F16D27/10

  with an electromagnet not rotating with a clutching member, i.e. without collecting rings {(F16D27/004 takes precedence)} · CPC title

• F16D2023/123

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

• F16D41/105

  the intermediate members being of circular cross-section, of only one size and wedging by rolling movement not having an axial component between inner and outer races, one of which is cylindrical · 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