The design feature of these discs is an increase in the contact surface of the springs with the restraining disc. The specific pressure of the supporting coils of the springs on the disc parts is reduced.
The operation of these disks provides:
increase in the motor resource of the disk by 2 times without taking into account the change of friction linings;
protection of the surfaces of the flywheel and pressure plate from damage in the event of a breakage of the spring, which is different from the design with open springs;