Measuring Torque

To refresh, torque is the force required to move a rotational element. When measuring the torque applied to a seal in a specific rotating parts application, torque characteristics are recorded to determine accurately whether the seal performs well within the assembly. This testing can also help identify causes of system failure possibly due to design-related issues.

Vanseal utilizes torque-to-turn measurement. It’s an essential validation and diagnostic tool for assemblies used in rotating parts such as engines, motors, transmissions or axles to measure system efficiency. There are two basic types of torque-to-turn tests:

  1. Breakaway torque (BT) is required to get the shaft moving, to overcome the inertia of the crankshaft and the static friction between it and the seal. The greater the friction, the greater breakaway torque required. Causes of high BT are insufficient oil, out-of-tolerance parts, material adhesion characteristics, and other factors.
  2. Running (rotational) torque (RT) is torque required to keep a shaft moving. Measurement of average torque will indicate potential problems. By measuring torque versus angle at high RPM, we gain insight from details of the waveform curve.

Torque instrumentation is calibrated to record breakaway and running torque and shaft speed.

If your applications run on a 24/7 basis, you may be most concerned with a seal’s running torque performance. For assemblies used in stop/start applications, you want seals tested for breakaway torque as well as running torque. In addition to torque testing, Vanseal performs related tests such as radial load, the coefficient of friction, abrasion, and others.

Torque Testing Reveals Energy Savings Potential

Are you confident that your seals will endure and perform to your expectations?  To improve fuel efficiency, meet regulatory emission standards, rotary seals need to perform at optimum levels. Vanseal has developed torque testing capabilities that address seal performance improvements to meet and even exceed industry-regulation expectations.

What Else Torque Testing Tells You

Torque testing is especially useful for seals in applications such as electric motors, gear boxes, electric pumps, generators, and automotive drive trains, engines and pumps. With torque test data, we can engineer and produce seals that reduce heat generation and energy consumption thus reducing fuel emissions. It’s a valuable process whether you want to understand the energy consumption of every element in a system, or you’re seeking fuel savings for your fleet.

Through torque testing, we can measure how certain variables affect a seal’s torque-to-turn performance. These variables can include:

  • Material compound comparisons, such as grades of PTFE and elastomer formulas
  • Hydrodynamic aid designs and fluid film
  • Shaft interference and finish
  • Radial load
  • Lip angle geometries

By incorporating this data into our development engineering, Vanseal continues to improve seal performance. Torque testing also improves the seal development process by:

  • Reducing development timing – understanding the materials and geometries affecting seal energy efficiency.
  • Reducing the likelihood of a seal being the cause of a system failure.

Make Sure Your Seals are Backed by Proven Test Data

Vanseal offers seal design concepts already proven to deliver optimum efficiencies. We provide comparative torque testing for customers on seals they currently use, as well as seals that we develop. Contact Vanseal for seal torque testing information that can help you optimize your fuel efficiency and emissions compliance results.

Print Friendly, PDF & Email