Torque limiter and drive device

Abstract

A torque limiter comprising a first rotary element rotated by a drive source, a first frictional element interlocked with the first rotary element, a second frictional element disposed overlapping the first frictional element and rotated along with the rotation of the first frictional element by the frictional force with the first frictional element, and a second rotary element interlocked with the second frictional element. Preferably, the first rotary element and the second rotary element are rotatably supported on the same rotating shaft, either one of the first rotary element and the second rotary element is fixed on the rotating shaft, and the other is supported to be capable of rotating relative to the rotating shaft.

Description

Technical field [0001] The present invention relates to a torque limiter and a drive device. Background technique [0002] Circulates toilets with electric toilet seat and toilet lid opening and closing functions equipped with a drive unit that automatically opens and closes the toilet seat or toilet lid. Such a drive unit is equipped with a torque limiter for protecting gears and motors constituting the drive unit when an overload is applied to the toilet seat or the toilet seat when a person opens and closes the toilet seat or the toilet lid by hand. As a torque limiter, a torque limiter using a ratchet is proposed (refer to Patent Document 1). [0003] Patent Document 1: Japanese Patent Application Publication No. 2014-149013 [0004] In the torque limiter disclosed in Patent Document 1, if an overload exceeding a predetermined torque (predetermined torque) is applied when opening and closing the toilet seat or the toilet lid, the engagement of the ratchet part is deviated and t...

AI Technical Summary

Problems solved by technology

[0004] In the torque limiter disclosed in Patent Document 1, when an overload exceeding a predetermined torque (predetermined torque) is applied when opening and closing the toilet seat or toilet lid, the engagement of the ratchet part is disengaged and the transmission of the overload is interrupted. , but there is a mechanical sound due to the rotation of the ratchet part

In addition, when the predetermined torque is set high to suppress the frequency of the mechanical sound, peripheral components such as motors and gears are required to have high strength in order to withstand an overload that does not exceed the predetermined torque. This also has an impact on the cost of the components

In addition, in the case of a resin ratchet, the torque (limit torque) when the transmission of the overload is actually disconnected has a large deviation, and the limit torque due to aging due to deformation of the ratchet itself during rotation is also considered. The change becomes bigger

[0005] The same problem occurs when the torque limiter is used to automatically open and close any movable animal other than the toilet seat.

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