US 2021/0277964 A1Published application

Reverse input blocking clutch and actuator

AssigneeNsk Ltd.

InventorsYuya DAIKOKU, Hirotaka KISHIDA, Hiroki HASHIGUCHI, Toshirou TOYODA

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Abstract

Provided is a reverse input blocking clutch capable of easily releasing a state in which rotation of an output member is prevented or suppressed. The reverse input blocking clutch 5 includes an input member 14, an output member 15, a pressed member 16, and an engaging member 17. When a rotational torque is inputted to the input member 14, the engaging member 17 moves in a direction away from a pressed surface 28 of the pressed member 16 due to engagement with the input member 14, and transmits the rotational torque inputted to the input member 14 to the output member 15 due to engagement with the output member 15; and when rotational torque is reversely inputted to the output member 15, moves in the direction closer to the pressed surface 28 based on engagement with the output member 15, and by being pressed against the pressed surface 28 does not transmit the rotational torque reversely inputted to the output member 15 to the input member 14, or transmits only part thereof to the input member 14 due to engagement with the input member 14.

Claims32

Dependent claims

A reverse input blocking clutch, comprising:

a pressed member having a cylindrical concave-shaped pressed surface having a center axis;
an input member having an input engaging portion arranged on an inner side in a radial direction of the pressed surface and having a center axis of rotation that is coaxial with the central axis of the pressed surface;
an output member having an output engaging portion arranged further on the inner side in the radial direction of the pressed surface than the input engaging portion and having a center axis of rotation that is coaxial with the pressed surface;
and
an engaging member having a first portion arranged on the inner side in the radial direction of the pressed surface at a position located in the radial direction between the input engaging portion and the output engaging portion, and a pair of second portions arranged at positions on both sides in a circumferential direction from the position located in the radial direction between the input engaging portion and the output engaging portion;
the engaging member being configured so that in a case where rotational torque is inputted to the input member, the engaging members moves in a direction away from the pressed surface due to the input engaging portion engaging with the first portion, and by the first portion engaging with the output engaging portion, transmits the rotational torque that is inputted to the input member to the output member;
and in a case where rotational torque is reversely inputted to the output member, the engaging member moves in a direction toward the pressed surface due to the output engaging portion engaging with the first portion, and by the pair of second portions being pressed against the pressed surface, does not transmit the rotational torque that is reversely inputted to the output member to the input member, or transmits a part of the rotational torque that is reversely inputted to the output member, to the input member, and blocks a remaining part thereof;
and
in a case where rotational torque is reversely inputted to the output member, a pair of contact portions where the pair of second portions and the pressed surface come in contact are positioned on sides closer to the center axis of the pressed surface than a specified portion with respect to a direction of a bisector of tangent lines of the pressed surface at each contact portion of the pair of contact portions, and the specified portion is a portion of the first portion with which the input engaging portion engage when a rotational torque is input to the input member.

6 more elements

An actuator comprising

a rotational linear motion conversion mechanism, and
a reverse input blocking clutch having a locking mechanism;
wherein
the rotational linear motion conversion mechanism comprises a screw shaft having a male-side engaging portion on an outer circumferential surface thereof and a nut having a female-side engaging portion on an inner circumferential surface thereof, and the male-side engaging portion and the female-side engaging portion are engaged with each other directly or via a plurality of intermediate engaging members;
the locking mechanism comprises a pressed member, an input engaging portion, an output engaging portion, and an engaging member;
the pressed member has a cylindrical pressed surface on the inner circumferential surface thereof;
the input engaging portion has a center axis of rotation that is coaxial with the center axis of the pressed surface, and is arranged on the inner side in the radial direction of the pressed surface;
the output engaging portion has a center axis of rotation that is coaxial with the center axis of the pressed surface, and is arranged on the inner side in the radial direction of the pressed surface and further on the inner side in the radial direction than the input engaging portion;
the engaging member is arranged on the inner side in the radial direction of the pressed surface, and when a rotational torque is inputted to the input engaging portion, moves in a direction away from the pressed surface due to the engagement with the input engaging portion and transmits the rotational torque inputted to the input engaging portion to the output engaging portion due to engagement with the output engaging portion;
whereas, when rotational torque is reversely inputted to the output engaging portion, the engaging member moves in a direction close to the pressed surface due to engagement with the output engaging portion, and by being pressed against the pressed surface, does not transmit the rotational torque that is reversely inputted to the output engaging portion to the input engaging portion, or transmits part of the rotational torque that is reversely inputted to the output engaging portion due to the engagement with the input engaging portion and blocks the remaining part;
the locking mechanism is arranged at a portion where the output engaging portion is connected to the nut so as to be able to transmit torque, and is arranged around the screw shaft in a portion separated in the axial direction from the female-side engaging portion;
and
the inner diameter dimension of the output engaging portion is smaller than the outer diameter dimension of a range in the axial direction in which the female-side engaging portion exists in the nut.

10 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/053,902Filed 26 Apr 2019
Priority: JP 2018-0890217 May 2018
Published: 9 Sep 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification15 codes

F16D 45/00
Freewheels or freewheel clutches combined with automatic clutches
F16H 25/2204
With balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members: with balls
F16D 3/02
Yielding couplings, i.e. with means permitting movement between the connected parts during the drive: adapted to specific functions
F16D 3/50
Yielding couplings, i.e. with means permitting movement between the connected parts during the drive: with the coupling parts connected by one or…