The **FRT-B4-R** is an electronic component primarily classified as a **Rotary Damper**. These parts are mechanical-electronic interface components used to control the speed and smoothness of motion in opening and closing mechanisms. --- ### 1. General Specifications The FRT series is manufactured by companies like **Fuji Latex**. The "B4" designation typically refers to the torque rating and body size, while the "R" indicates the direction of damping. | Feature | Specification | | :--- | :--- | | **Component Type** | Rotary Damper | | **Rotation Type** | Continuous Rotation | | **Damping Direction** | Right (Clockwise) | | **Torque Range** | Approx. 4.0 ± 1.0 mN·m | | **Material** | Polycarbonate / Polyacetal (Housing & Gear) | | **Operating Temp** | 0°C to 50°C | --- ### 2. Internal Mechanism and Electronics While it does not contain a PCB (Printed Circuit Board), it is considered an "electronic part" in the context of electromechanical assembly for consumer electronics. * **Viscous Friction:** The internal chamber is filled with high-viscosity **silicone oil**. When the gear rotates, the oil provides resistance, converting kinetic energy into thermal energy. * **One-Way Clutch (The "R" Suffix):** The internal design allows for damping in the **Clockwise (Right)** direction, while allowing free or low-resistance movement in the Counter-Clockwise direction. * **Gear Interface:** It usually features a standard spur gear (module 0.8 or 1.0) to interface with the mechanical rack of the device. --- ### 3. Common Applications In the electronics industry, the FRT-B4-R is used to provide a "premium" feel to hardware: 1. **CD/DVD Players:** Smooth ejection of the disc tray. 2. **Audio Consoles:** Damping for slow-release buttons and flip-up panels. 3. **Smart Furniture:** Soft-closing lids for power outlet hidden compartments. 4. **Automotive Electronics:** Damping for ash-trays, cup holders, and glove box compartments. --- ### 4. Technical Drawing & Dimensions (Typical) ```text [ Gear ] /---\ | | <-- 15mm - 20mm Diameter | body| \---/ | [Shaft] ``` ---