Powerful brakes ensure reliability – our centrifugal for your safety!
Centrifugal brakes
Centrifugal brake without housing
How does a centrifugal brake work
Do you need a centrifugal brake to secure your users and applications? Then you have come to the right place. Here you will find an overview of the function and advantages of Amsbeck centrifugal brakes:
The centrifugal brake works in principle like a centrifugal clutch. In the clutch, the housing is not fixed and starts to rotate when the engagement speed of the clutch is reached and transmits torque as the speed increases. With the centrifugal brake, the housing is fixed and secured against rotation.
Good to know: A centrifugal brake does not brake to a stop. The main application for centrifugal brakes is to limit speed to a safe level.
Functional principle of centrifugal brakes
Guided weight elements set in rotation experience a radial force component which accelerates them outward. This force is compensated by spring forces up to the defined engagement speed.
Bei Erreichen der Einschaltdrehzahl liegen die Reibbeläge im Gehäuse an und der Drehmomentenaufbau am Gehäuse beginnt. Steigerung der Drehzahl führt zu quadratisch steigenden Kräften und somit zu steigenden Drehmomenten. Die Bremse befindet sich im Anfang des Arbeitsbereiches. Der Arbeitsbereich liegt zwischen Einschaltung und dem Drehmomentengleichgewicht zwischen Lastmoment und Bremsmoment. Dieses Drehmomentengleichgewicht muss im Rutschbereich der Bremse liegen.
As long as the centrifugal brake is not switched on, so the spring force outweighs the centrifugal force, the system operates without contact and without losses. In order not to affect the brake function, fat, oil and wetness must be kept away from the friction surfaces.
Durch Variation der Federauslegung, des Reibwerkstoffes, der Baugröße, der Anzahl paralleler Elemente und der Betriebsdrehzahl werden Einschaltdrehzahl und Bremsmoment bestimmt und auf den jeweiligen Einsatzfall angepasst.
Centrifugal brake
Engaging the centrifugal brake
Grundsätzlich richtet sich die Einschaltdrehzahl nach dem Gleichgewicht von Lastmoment und Bremsmoment. Da die Leistung einer Fliehkraftbremse mit steigender Drehzahl quadratisch zunimmt ist eine Mindest-Betriebsdrehzahl des Bremssystems erforderlich. Die Einschaltdrehzahl einer Fliehkraftbremse beschreibt die Drehzahl bei der die Masse der Fliehgewichte, durch die auf sie wirkenden Fliehkräfte, die Rückhaltekraft der Federn überwindet. Durch Wahl unterschiedlich starker Federn, welche die Fliehgewichte unterschiedlich lange zurückhalten, kann die Einschaltdrehzahl variiert werden. Eine Fliehkraftbremse kann, aufgrund dieser Zusammenhänge, ein System nicht bis zum Stillstand abbremsen, häufig dienen sie als Geschwindigkeitsbegrenzer.
Dimensioning
Centrifugal brakes are generally safety-relevant components, so careful design and consideration of the operating conditions is essential. For the correct design of the centrifugal brake, the following parameters are therefore important in addition to the respective application:
- Operating speed
- Engagement speed
- Frequency of braking operations
- Braking time
Heating of the centrifugal brake
Reibung erzeugt Wärme, so wandelt eine Fliehkraftbremse die geleistete Reibarbeit komplett in Wärme um. Die Wärme entsteht direkt im Reibkontakt und erwärmt im Wesentlichen das Material welches direkt am Reibkontakt beteiligt ist (siehe Abb.). Die Hitzeentwicklung ist dabei abhängig von den jeweiligen Einsatzbedingungen als auch von folgenden Faktoren:
- Braking torque
- Size of the clean area
- Braking time
Heat conduction causes heat to be distributed throughout the entire brake. The temperature rises sharply at the start of braking and levels off as it progresses until a maximum is reached. When designing a brake, care must be taken to ensure that the maximum permissible temperatures in the friction contact are not exceeded, as otherwise significantly increased wear will occur on the friction lining. This thermal overload significantly changes the friction values and can have a negative effect on the function of the brake. Due to the resulting surface temperatures, protective devices may be necessary in the area of the brake.
Structure of the centrifugal brake
Each centrifugal brake consists of a profiled hub on which centrifugal weights are held together by lining hanger with brake linings (friction material) by tension springs. The inner workings of the brake are pressed into the brake housing with bearings and secured by cover discs and circlips.
Fields of application at a glance:
Speed limitation when lowering people or weight from heights to the ground:
- Gate systems / fire protection curtains
- Free time applications such as ziplines
In which applications is the centrifugal brake used?
The main area of application is in speed limitation. Often there are centrifugal brakes in descenders, which gently lower people to the ground in case of danger. Safety engineering is a broad field of centrifugal brakes.
In addition to descenders, centrifugal brakes are used in cranes, elevators, gate systems and fire curtains. But people are also secured in leisure applications such as ropeways, which you are certainly familiar with or have also used.
What advantages do you gain when using Amsbeck centrifugal brakes?
- As a safety brake, the centrifugal brake provides an additional safety feature for your users and applications. Ideally suited for braking systems.
- It is often used as a backup braking system to the electronic brake.
- The centrifugal brake operates purely mechanically and has the advantage that it reliably and safely brakes the speed until a permissible lowering speed is reached, regardless of any other energy supply.
- If a brake housing is available on your part, we deliver the centrifugal brake without housing.
- Simple and cost-effective replacement of wear parts such as brake pads and tension springs
- Individually adapted to your application and requirements. Examples can be found in the overview below.
- Experience and KnowHow for more than 40 years
Would you like to check whether the principle of the centrifugal brake is suitable for your application? Feel free to contact us by phone, contact form or e-mail. Our team will be happy to coordinate the technical design with you.
An overview of our
Centrifugal brake
Centrifugal brake
Centrifugal brake
Centrifugal brake
Do you have any questions? Please contact us.
Product enquiry form
Centrifugal brake without housing
If you are looking for a specific drive concept, we recommend our product request form in which you can comfortably enter the necessary details.
Or print out the drawing, enter your dimensions and upload the scanned document to the form under "Upload", which you send to us.
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