Torque limiter and drive device

The patent implements nesting by placing the first friction body and second friction body in a stacked configuration within a limited axial space. The friction bodies are nested between the first rotary body and second rotary body, allowing the torque limiting mechanism to occupy minimal volume while maintaining full functionality. This nested arrangement enables the torque limiter to achieve compact dimensions without compromising its ability to limit torque through friction-based slipping.

The patent applies local quality by providing a keeping surface on the second rotary body that locally concentrates and stabilizes the contact interaction with the second friction body. This localized feature ensures consistent friction engagement and reliable torque limiting performance. Additionally, the fastening member is positioned to locally apply compressive force to the disc spring, ensuring stable pressing force on the friction bodies. These localized quality enhancements maintain slip torque stability despite the overall compact size of the torque limiter.

The patent merges multiple functions into integrated components to reduce overall complexity. The fastening member simultaneously serves to fix the disc spring in place and apply compressive force to press the friction bodies against each other. The disc spring itself combines elastic deformation capability with torque transmission function. The first and second friction bodies are merged into a compact stacked arrangement that achieves both torque limiting and space efficiency. These merging strategies enable compact design without proportionally increasing component arrangement complexity.