The central spring clutch adopts 1-2 cylindrical coil springs or conical coil springs with a rectangular cross-section as the compression spring and is arranged in the middle of the clutch. Its structural components include a pressure plate, a clutch cover, an adjustment ring, an elastic pressure rod, a fan blade, a compression spring, a release bearing, a release sleeve, and a pressure plate release spring.

    The pressure spring of the central spring clutch is not in direct contact with the pressure plate, so the heat generated by the pressure plate due to friction will not be directly transferred to the spring to make the tempering failure. The pressing force of the central spring acts on the pressure plate through the lever system and is amplified by the lever ratio, so a small spring force can be used to obtain a sufficiently large pressing force of the pressure plate. The middle section of the elastic pressure rod of some central spring clutches is often made into a blade shape, which becomes a fan blade, which is beneficial to the ventilation and heat dissipation of the clutch.

    Zhoubu spring clutches are currently mainly used in commercial trucks. Structurally, the coil springs are arranged in concentric circles along the circumference of the pressure plate. The pressure plate, release lever, and coil spring are all installed inside the clutch cover, it forms the clutch cover assembly. The flywheel acts as one active friction surface of the clutch, while the other active friction surface is the pressure plate.

    The coil spring used in the circumferential spring clutch is linear. When the friction plate is worn, the spring expands long, and the pressing force decreases, which is very detrimental to the reliable torque transmission of the clutch. For this reason, the structure of the combined circumferential coil spring can be used instead, and the spring is placed inside the large spring. The two rotate in opposite directions, and the spring stiffness is also different. In order to ensure that the pressure distribution on the friction plate is as uniform as possible, the number of compression springs should not be too small and should increase with the increase of the diameter of the friction plate, and sometimes even arranged in two rows.