The Development of Locking Assemblies (Shaft Locking)

The origins of locking assemblies date back more than five decades, with Oskar Peter playing a key role in their development. His innovative designs, in collaboration with RINGFEDER POWER TRANSMISSION, have significantly influenced modern mechanical engineering, providing durable and efficient solutions that continue to be widely used today.

1. What the shaft locking? The Origins of Locking Assemblies.

Locking Assemblies are also known as shaft locking, it’s mechanical components designed to securely connect and transmit torque between two mating parts, such as shafts and hubs, without the need for keys, keyways, or additional fasteners. They utilize frictional forces generated by tightening screws or other mechanisms to create a rigid, backlash-free connection. Locking assemblies are widely used in various industrial applications to ensure precise positioning, easy installation, and maintenance-free operation. They are ideal for applications requiring high torque transmission, reliability, and the ability to accommodate misalignments or thermal expansions.

The inception of Locking Assemblies dates back more than five decades, with the pioneering contributions of Oskar Peter playing a crucial role in their development. Collaborating closely with RINGFEDER POWER TRANSMISSION, Peter introduced groundbreaking designs that revolutionized machine component technology. His innovations led to the creation of highly reliable and durable shaft locking joints, which have stood the test of time. In fact, two of his original designs are still in use today, a testament to the remarkable longevity and effectiveness of his engineering solutions. This enduring success highlights the ingenuity behind his work and the lasting impact it has had on modern mechanical engineering.

2. Outstanding features of Shaft Locking Assembly 

Initially designed for torque transmission, RINGFEDER has continuously enhanced its Shaft Locking Assemblies to handle various loads, including 
- Radial (as in fan blades)
- Axial (in press frames)
- Bending (as in the case of conveyor drums).

The key requirement is maintaining torque within specified limits. This adaptability has led to specialized versions tailored to customer needs and industry demands, such as anti-magnetic models for submarines and stainless steel options for the food and chemical industries.

3. Shrink Disks serving as External Shaft Locking Devices

For many years, shrink discs, which are easily installed from the outside, have replaced traditionally used Shaft locking assemblies in shaft-mounted gearboxes. They provide easier installation from the outside and are particularly effective in confined spaces.
There are two main configurations:
- Three-part self-releasing model RfN 4061: Installed and tensioned with a torque wrench, allowing flexible adjustment of drive values ​​and component loads via tightening torque.
- Two-part version RfN 4161: “Tightened to block” design, eliminating the need for a torque wrench during installation.
The choice of configuration depends on the specific requirements of the application and the installation constraints.

4. Optimized application of Shaft Locking Assembly 

Based on advancements in materials and coatings have expanded the use of shaft locking assemblies. In one case, Kaplan turbine guide blades were optimized for a power plant, requiring a retractable design to prevent damage from foreign objects. The locking assembly not only transmitted torque but also enabled smooth sliding without friction-induced wear, thanks to specialized coatings.  

RINGFEDER engineers, leveraging extensive in-house testing and real-world experience, solved a critical issue for a power plant using a competitor’s locking device on a Pelton wheel. They recommended the RfN 7015.0 (280 x 355 mm), which was successfully tested for tensioning and removal. This solution ensures reliable torque transmission, excellent concentricity, and effortless dismounting, even with minor shaft rust.

These examples are just a few of the versatile and innovative applications for shaft locking assemblies. These assemblies are not limited to the field of mechanical engineering that Oskar Peter laid the foundation for. Today, solutions involving locking assemblies have become standard in many different application areas, including the mining and steel industries.

5. Dai Hong Phat Corp - A reputable and quality shaft locking assemblies joint supplier

Dai Hong Phat Corp is honored to be an authorized representative of Ringfeder Germany, offering customers authentic, high-quality Locking Assemblies tailored to the demands of various industries.

With over 15 years of expertise in mechanical transmission, you can have complete confidence when purchasing from Dai Hong Phat Corp because:

- A team of experienced engineers to support you in choosing the right shaft lock.
- Products have a clear origin and CO / CQ documents.
- Goods are always available in stock, fast delivery.
- There is a workshop to process and adjust products according to requirements.
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