Rotation transmission device

Patent metadata

Field	Value
Publication number	US-2016010702-A1
Application number	US-201414763527-A
Country	US
Kind code	A1
Filing date	Jan 16, 2014
Priority date	Jan 30, 2013
Publication date	Jan 14, 2016
Grant date	—

Abstract

A rotation transmission device is provided which generates less colliding sounds and vibrations. The rotation transmission device is configured such that when an electromagnet of an electromagnetic clutch is energized, an armature is attracted toward a rotor, so that a control retainer forming a two-way clutch is moved in the axial direction, whereby the control retainer and a rotary retainer are rotated relative to each other in the direction in which the circumferential widths of pockets decrease, thereby disengaging pairs of rollers from the inner periphery of an outer ring and the outer periphery of an inner ring. The rotation transmission device includes a shock absorbing member provided on the surface of the armature facing the rotor and configured to absorb impact force when the armature is attracted to the rotor by being elastically deformed.

First claim

1 . A rotation transmission device comprising an input shaft, an output shaft arranged coaxial with the input shaft, a two-way clutch configured to selectively transmit rotation between the input shaft and the output shaft, and an electromagnetic clutch configured to selectively engage and disengage the two -way clutch,
wherein the two-way clutch comprises an outer ring provided at an end of the output shaft and having an inner periphery, an inner ring provided at an end of the input shaft and having an outer periphery, a control retainer including first bars, a rotary retainer including second bars, wherein the first bars and the second bars are received between the inner periphery of the outer ring and the outer periphery of the inner ring, and arranged such that the first bars alternate with the second bars in a circumferential direction, with pockets defined between respective adjacent pairs of first and second bars, a plurality of pairs of engaging elements, each pair of the engaging elements being received in each of the pockets so as to be engageable with the inner periphery of the outer ring and the outer periphery of the inner ring, and elastic members each received in each of the pockets and biasing the pair of the engaging elements received in each of the pockets away from each other, wherein the electromagnetic clutch comprises an armature coupled to the control retainer, a rotor spaced apart from, and facing, the armature in an axial direction, and an electromagnet supported by a stationary member so as to face the rotor in the axial direction, and configured to apply a magnetic attraction force to the armature such that the armature is attracted toward the rotor, when the electromagnet is energized, wherein the rotation transmission device is configured such that when the electromagnet is energized, the control retainer is moved in the axial direction toward the rotor, together with the armature, and wherein the rotation transmission device further comprises a motion converter mechanism configured to convert the axial movement of the control retainer toward the rotor to a relative rotation between the control retainer and the rotary retainer in a direction in which circumferential widths of the pockets decrease, thereby disengaging the engaging elements, and wherein a shock absorbing member for absorbing an impact force when the armature is attracted to the rotor is provided on one of an opposed surface of the armature facing the rotor and an opposed surface of the rotor facing the armature.

2 . The rotation transmission device of claim 1 , wherein the shock absorbing member comprises an elastic ring made of rubber or synthetic resin, and fitted in an annular groove formed in said one of opposed surfaces of the armature and the rotor so as to partially protrude outwardly.

3 . The rotation transmission device of claim 1 , wherein the shock absorbing member comprises a metal ring comprising an annular plate portion and a cylindrical portion provided at an outer periphery of the annular plate portion, and an elastic protrusion adhesively bonded to an inner surface of the annular plate portion of the metal ring, wherein the shock absorbing member is mounted such that the cylindrical portion is fitted on an outer periphery of one of the armature and the rotor having said one of the opposed surfaces, the annular plate portion faces an axial end surface of an annular recess formed in said one of the opposed surfaces at an outer peripheral portion of said one of the opposed surfaces, the protrusion is supported by the axial end surface, and the annular plate portion has an outer surface protruding from said one of the opposed surfaces.

4 . The rotation transmission device of claim 3 , wherein the cylindrical portion has a radially inner surface formed with a plurality of circumferentially spaced apart projections fitted in an annular groove formed in the outer periphery of said one of the armature and the rotor, and in engagement with an end wall of the annular groove on a side of said one of the opposed surfaces.

5 . The rotation transmission device of claim 3 , wherein the protrusion is a circumferentially continuous annular protrusion.

6 . The rotation transmission device of claim 3 , wherein the protrusion comprises a plurality of circumferentially spaced apart, circular arc-shaped, annularly arranged protruding portions.

7 . The rotation transmission device of claim 1 , wherein the shock absorbing member comprises an annular plate portion in the form of a metal sheet, and a plurality of elastic bent pieces formed on at least one of an outer peripheral portion and an inner peripheral portion of the annular plate portion so as to be spaced apart from each other in the circumferential direction, wherein the annular plate portion of the shock absorbing member is fitted in an annular groove formed in said one of the opposed surfaces so as to be inseparably fixed in position, with distal ends of the bent pieces protruding outwardly from said one of the opposed surfaces.

8 . The rotation transmission device of claim 7 , wherein the annular plate portion is inseparably fixed in position by caulking peripheral edge of an opening of the annular groove toward the opening.

9 . The rotation transmission device of claim 7 , wherein the annular plate portion is inseparably fixed in position by adhesively bonding the annular plate portion to an axial end surface of the annular groove.

10 . The rotation transmission device of claim 4 , wherein the protrusion is a circumferentially continuous annular protrusion.

11 . The rotation transmission device of claim 4 , wherein the protrusion comprises a plurality of circumferentially spaced apart, circular arc-shaped, annularly arranged protruding portions.

Assignees

• Ntn Toyo Bearing Co Ltd

Inventors

• KITAYAMA Naotsugu
• FUKUNARI Marina
• Sasanuma Kyohei
• Akiyoshi Koji
• Kawai Masahiro
• Saito Takahide
• Sato Koji

Classifications

• F16D27/08

  with friction surfaces arranged externally to the flux · CPC title

• F16D27/14 Primary

  Details · CPC title

• F16D41/084

  the intermediate coupling members wedging by pivoting or rocking · CPC title

• F16D2300/22

  Vibration damping · 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