Centrifugal clutches and brakes

Centrifugal clutches and brakes use centrifugal forces to transmit power (clutch) or to limit speed (brake). As the brakes are based on a physical principle, centrifugal clutches or brakes do not require any additional external power supply, which makes them a perfect solution for safety applications.

Centrifugal clutches and brakes consist of a driving shaft with flyweights mounted around it. Flyweights are kept on the shaft by springs, on the outer side of the flyweights, there are friction pads.

Differences between a centrifugal clutch and centrifugal brake:

The main difference between a centrifugal clutch and a centrifugal brake is in the drum: At a centrifugal clutch, the drum is not fixed and will begin to turn when the engagement speed / operating speed is reached. At a centrifugal brake, the outer drum is fix and cannot turn. This causes a braking force when the friction pads touch the drum. When designing and operating centrifugal brakes, there must be a special focus on braking time and the maximum heat.

Typical applications for centrifugal clutches:

Centrifugal clutches are mainly used as a start up clutch. A centrifugal clutch allows the usage of a smaller motor, because the motor can start load free until it has reached its optimum operating speed, at which the load is smoothly added by the centrifugal clutch.

Typical applications for centrifugal brakes:

The main application for centrifugal brakes is limiting the speed of e.g ◘ descending weight or persons ◘ safety- and fire doors – industrial applications ◘ leisure applications – Go Kart to a safe level.
Category:
    F-TYPE - Self-increasing clutch
    • High efficiency with a self-increasing effect
    • Performance factor of 2.5
    • Compact design

    Construction and mode of operation

    1. The flyweights are seated on
    2. the profiled hub and are held against it by
    3. tension springs, which are hooked into the
    4. linings. Discs locate the flyweights axially. Each lining has a crimping on its inner surface to locate it on the flyweight. This prevents the linings from moving sideways. As the profiled hub rotates, the centrifugal force acting on the flyweights overcomes the spring force. When the speed is high enough, the linings contact the
    5. clutch drum and friction between the linings and the drum allows torque to be transmitted between the two.
    construction-f-type
    1
    profiled hub
    2
    flyweights
    3
    tension springs
    4
    linings
    5
    clutch drum

    Performance data and dimensions

    Type NumberD [mm]B [mm] 1d max. [mm]standard bore
    diameter
    d [mm] (inch) 2
    Standard rotational speed
    lownormalhigh
    M at nE 750 and
    nB 1500 [Nm]
    recommended
    motor power
    [kW] 3
    M at nE 1250 and
    nB 2500 [Nm]
    recommended
    motor power
    [kW] 3
    M at nE 1500 and
    nB 3000 [Nm]
    recommended
    motor power
    [kW] 3
    F01501014121.30.1720.3
    F0260151815 (5/8)40.550.8
    F0370152215; 20 (7/8)70.9101.6
    F0480152814 – 25 (3/4; 7/8)40.3111.4162.5
    F0590203518; 20; 25 (3/4; 1)100.8263.4406.3
    F06100203520; 24; 28 (3/4; 1)161.3425.5609.4
    F07110204028; 35; 40 (1)252.0709.010015.7
    F08125205025; 38; 49 (3/4; 1)403.212015.718028.3
    F09138255530; 38; 48 (1)907.024031.032050.0
    F10150256038; 48; 4912510.034044.547074.0
    F11165306542; 50; 55 (1 7/16)22017.262081.0870136.0
    F12180407550; 60 (2 3/8)46036.01200157.01700267.0
    F13200307535; 55; 65 (2 3/8)52041.01300170.01850290.0

    1) The transmitted power increases as the width B is increased.
    2) Tapered bores and special dimensions can be manufactured on request.
    3) Motor power is calculated using a safety factor of 2.

    Final selection of the clutch should be accomplished by SUCO!

    d = bore dia.
    d max. = max. bore dia.
    B = flyweight width
    D = inside dia. of drum
    M = torque
    nE = engagement speed
    nB = operating speed

    f-type_sketch
    • Low noise level by guided pins
    • Performance factor of 1.5
    • Compact design
    Pin-guided clutch with three flyweights

    Construction and mode of operation

    The cylindrical hub carries three flyweights which are located by and can slide on cylindrical pins. Inside the flyweights there are tension springs which restrain neighboring flyweights until centrifugal force overcomes the spring force. Then the flyweights lift from their seats and the linings on the flyweights contact the inside diameter of the clutch drum. Friction between the linings and the clutch drum allows torque to be transmitted.

    construction-s-type
    1
    cylindrical hub
    2
    flyweight
    3
    cylindrical pin
    4
    tension springs
    5
    linings
    6
    clutch drum

    Performance data and dimensions

    Type NumberD [mm]B [mm] 1d max. [mm]standard bore
    diameter
    d [mm] (inch) 2
    Standard rotational speed
    lownormalhigh
    M at nE 750 and
    nB 1500 [Nm]
    recommended
    motor power
    [kW] 3
    M at nE 1250 and
    nB 2500 [Nm]
    recommended
    motor power
    [kW] 3
    M at nE 1500 and
    nB 3000 [Nm]
    recommended
    motor power
    [kW] 3
    S0480252415 (3/4; 7/8)4.30.3121.617.52.8
    S0590253014; 30 (3/4; 1)7.50.62122.8314.9
    S06100252420; 24; 28 (3/4; 7/8)110.8304.0437.0
    S07110253028; 30 (1)151.2456.06410.0
    S08125254020; 30 (1; 1/2)302.48511.012420.0
    S09138253017; 30; (1; 1 1/8)403.011215.016025.0
    S10150354038; (1 1/8)786.021628.031049.0

    1) The transmitted power increases as the width B is increased.
    2) Tapered bores and special dimensions can be manufactured on request.
    3) Motor power is calculated using a safety factor of 2.

    Final selection of the clutch should be accomplished by SUCO!

    d = bore dia.
    d max. = max. bore dia.
    B = flyweight width
    D = inside dia. of drum
    M = torque
    nE = engagement speed
    nB = operating speed

    s-type_sketch
    • Low noise level by guided pins
    • Easy to service
    • Performance factor 1.0
    Pin-guided clutch with two flyweights

    Construction and mode of operation

    The cylindrical hub carries two flyweights, which are located by and can slide on cylindrical pins. Thetension springs are attached outside the flyweights to lining carriers. The tension springs restrain the flyweights until centrifugal force overcomes the spring force. Then the flyweights lift from their seats and the linings contact the inside diameter of the clutch drum. Friction between the linings and the clutch drum allows torque to be transmitted.

    construction-w-type
    1
    cylindrical hub
    2
    flyweight
    3
    cylindrical pin
    4
    tension springs
    5
    lining carriers
    6
    clutch drum

    Performance data and dimensions

    Type NumberD [mm]B [mm] 1d max. [mm]standard bore
    diameter
    d [mm] (inch) 2
    Standard rotational speed
    lownormalhigh
    M at nE 750 and
    nB 1500 [Nm]
    recommended
    motor power
    [kW] 3
    M at nE 1250 and
    nB 2500 [Nm]
    recommended
    motor power
    [kW] 3
    M at nE 1500 and
    nB 3000 [Nm]
    recommended
    motor power
    [kW] 3
    W04801515151.70.144.60.66.61.0
    W0590202514 (5/8)3.70.310.31.414.82.3
    W061002030305.70.4516.02.023.03.6
    W0711020408.60.724.03.234.55.5
    W08125204020; 30 (1 1/2)14.01.038.55.0558.5
    W09138255527.02.275.09.811017
    W10150256038; (1 1/8)36.53.01021314523

    1) The transmitted power increases as the width B is increased.
    2) Tapered bores and special dimensions can be manufactured on request.
    3) Motor power is calculated using a safety factor of 2.

    Final selection of the clutch should be accomplished by SUCO!

    d = bore dia.
    d max. = max. bore dia.
    B = flyweight width
    D = inside dia. of drum
    M = torque
    nE = engagement speed
    nB = operating speed

    w-type_sketch
    • Extremely narrow design
    • Lowest noise level of SUCO clutches
    • Performance factor between 1.75 and 1.25 (depending on direction of rotation)
    Asymmetric pivot clutch

    Construction and mode of operation

    Flyweights are normally mounted so that they can pivot on pins, which are fitted to a flange. There are tension springs which restrain neighboring flyweights until centrifugal force overcomes the spring force. Then the flyweights lift from their seats and the bonded linings contact the inside diameter of the clutch drum. Due to the asymmetric arrangement of the flyweights, the torque that can be transmitted by this type of clutch depends on the direction of rotation.

    1
    Flyweights
    2
    tension spring
    3
    lining
    4
    clutch drum
    5
    pins

    Performance data and dimensions

    Type NumberD [mm]B [mm] 1Standard rotational speed
    lowhigh
    M at nE 750 and
    nB 1500 [Nm]
    recommended
    motor power
    [kW] 2
    M at nE 1500 and
    nB 3000 [Nm]
    recommended
    motor power
    [kW] 2
    P11187301751346060
    P12193301801450070

    Other sizes are available on request.

    1) The transmitted power increases as the width B is increased.
    2) Motor power is calculated using a safety factor of 2.

    Final selection of the clutch should be accomplished by SUCO!

    B = flyweight width
    D = inside dia. of drum
    M = torque
    nE = engagement speed
    nB = operating speed

    p-type_sketch