Rotation locking device

Patent metadata

Field	Value
Publication number	US-11767913-B2
Application number	US-202117633257-A
Country	US
Kind code	B2
Filing date	Mar 17, 2021
Priority date	Mar 18, 2020
Publication date	Sep 26, 2023
Grant date	Sep 26, 2023

Abstract

A rotation locking device 4 has a locking gear 5; a reverse input blocking clutch having an input member 12 and an output member 13; and an engaging member 8, and switches between a first mode where an engaging claw portion 14 engages with an engaging concave portion 9 by the output member 13 rotating the engaging member 8 due to the input member 12 being rotationally driven, and rotation of the locking gear 5 is restricted, and a second mode where engagement between the engaging claw portion 14 and the engaging concave portion 9 is released and rotation of the locking gear 5 is allowed.

First claim

The invention claimed is:

1. A rotation locking device, comprising:
a locking gear having engaging concave portions at a plurality of locations in a circumferential direction thereof;
a reverse input blocking clutch having an input member, and an output member arranged coaxially with each other, and in a case where rotational torque is inputted to the input member, transmits the rotational torque inputted to the input member to the output member, and in a case where rotational torque is reversely inputted to the output member, does not transmit the rotational torque inputted to the output member to the input member; and
an engaging member having an engaging claw portion capable of engaging in an engaging concave portion of the engaging concave portions, and is rotatably supported by the output member;
the rotation locking device switching between a first mode where the engaging claw portion engages with the engaging concave portion by the output member rotating the engaging member due to the input member being rotationally driven, and rotation of the locking gear is restricted, and a second mode where engagement between the engaging claw portion and the engaging concave portion is released and rotation of the locking gear is allowed.

2. The rotation locking device according to claim 1 , wherein an actuator for rotationally driving the input member is provided.

3. The rotation locking device according to claim 2 , wherein
the engagement between the engaging claw portion and the engaging concave portion is released by rotating the engaging member in a same direction as a direction of force applied to the engaging member from the locking gear when switching from the first mode to the second mode.

4. The rotation locking device according to claim 2 , wherein the rotation locking device being assembled and used in a drive system for transmitting rotational torque from a drive source to drive wheels.

5. The rotation locking device according to claim 1 , wherein
the reverse input blocking clutch comprises:
the input member having an input member side engaging portion;
the output member having an output member side engaging portion;
a pressed member having a pressed surface; and
an engaging element having a pressing surface facing the pressed surface, an engaging element side input engaging portion engaging with the input member side engaging portion, and an engaging element side output engaging portion engaging with the output member side engaging portion; and

the engaging element,
when rotational torque is inputted to the input member, displaces so as to separate the pressing surface from the pressed surface due to engagement between the input member side engaging portion and the engaging element side input engaging portion, and by engaging the engaging element side output engaging portion with the output member side engaging portion, transmits the rotational torque inputted to the input member to the output member; and,
when rotational torque is reversely inputted to the output member, displaces so as to press the pressing surface against the pressed surface due to engagement between the output member side engaging portion and the engaging element side output engaging portion, and by frictionally engaging the pressing surface with the pressed surface, does not transmit the rotational torque reversely inputted to the output member to the input member.

6. The rotation locking device according to claim 5 , wherein
a pair of engaging elements is provided, each composed of the engaging element; the pair of engaging elements being arranged so as to sandwich the output member side engaging portion from outside in a radial direction thereof.

7. The rotation locking device according to claim 5 , wherein
the engaging element, comprises:
an engaging element main body having the pressing surface, the engaging element side output engaging portion, and a pivot support portion located on a side closer to the pressed surface than the engaging element side input engaging portion in a direction of movement of the pressing surface when moving away from or toward the pressed surface; and
a link member having the engaging element side input engaging portion, and a pivotally supported portion that is pivotally supported by and the pivot support portion.

8. The rotation locking device according to claim 7 , wherein
the engaging element main body comprises:
a pair of main body plates, each having a plate side output engaging portion constituting the engaging element side output engaging portion, and arranged overlapping in an axial direction of the pressed surface and coupled to each other; and
a pivot support shaft constituting the pivot support portion, both side portions in the axial direction of the pivot support shaft being supported by the pair of main body plates; and

the link member is arranged between the pair of main body plates.

9. The rotation locking device according to claim 8 , wherein
the engaging element main body comprises at least one intermediate plate that is sandwiched between the pair of main body plates.

10. The rotation locking device according to claim 1 , wherein
a speed reducer is provided between the output member and the engaging member.

Assignees

• Nsk Ltd

Inventors

• Dohi Nagao

Classifications

• F16H63/3433 Primary

  Details of latch mechanisms, e.g. for keeping pawls out of engagement · CPC title

• B60T1/005

  by locking of wheel or transmission rotation · CPC title

• B60T1/062

  acting on transmission parts · CPC title

• F16D43/211

  with radially applied torque-limiting friction surfaces · CPC title

• F16D43/22

  controlled by both speed and torque · CPC title