It has been desired to allow the multi plate friction engagement mechanism to be used for other applications other than the braking apparatus.Solution: a brake 55 for braking rotation of the rotary shaft is provided, a first boss member 56 integrally rotated with the rotary shaft 44 to the brake 55, and a second boss member 57 which is relatively rotatable relative to the rotary shaft 44 and is fixed between the rotary shaft 44 and the first boss member 56 and fixed to the fixing part An engaging condition for restricting relative rotation between the first boss member 56 and the second boss member 57 can be switched between the first boss member 56 and the second boss member 57, and the release releasing condition allowing relative rotationA multi plate friction engagement mechanism 58 and an operating mechanism 59 for pressing the multi plate friction engagement mechanism 58 are provided.Diagram【課題】多板摩擦式係合機構を制動装置以外の他の用途にも流用できるようにすることが望まれていた。【解決手段】回転軸の回転を制動するブレーキ55が備えられ、ブレーキ55に、回転軸44と一体回転する第1ボス部材56と、回転軸44と相対回転自在で且つ回転軸44と第1ボス部材56との間に位置して固定部16に固定された第2ボス部材57と、第1ボス部材56と第2ボス部材57との間に位置して、第1ボス部材56と第2ボス部材57との相対回転を規制する係合状態と、相対回転を許容する係合解除状態とに切り換え自在な多板摩擦式係合機構58と、多板摩擦式係合機構58を押圧操作する操作機構59とが備えられている。【選択図】図3
