内啮合摩擦式棘轮机构 滚子内啮合摩擦式棘轮机构 Internally meshed silent Internally meshed roller silent ratchet mechanism ratchet mechanism滚子内啮合摩擦式棘轮机构 Internally meshed roller silent ratchet mechanism 内啮合摩擦式棘轮机构 Internally meshed silent ratchet mechanism