Spring Clips

Helwig offers a wide range of replacement spring assemblies for constant force brush holders, including those used in electric motors, generators, and turbine ring magazines. 

Our constant force springs are engineered to meet or exceed the performance of the original parts. We carry over 40 popular styles in stock, and can also create custom constant force spring assemblies to meet your application requirements.

Advantages of Constant Force Spring Assemblies

  • Offers reliable, consistent force resulting in better brush performance and improved brush life.
  • Engineered to give optimal performance for electrical contacts in motors, generators, and other equipment. 
  • Our constant force springs are replaceable, unlike other springs that may require replacing the entire holder assembly.
  • Helwig Carbon constant force springs and holders can be refurbished, giving you like-new components without the added expense.
  • Fast turnaround on in-stock and custom made spring assemblies for reduced machine downtime.

Applications for Our Constant Force Spring Assemblies

  • Industrial D.C. motors 
  • High speed turbine rings 
  • Soft graphite brush grades 
  • Metal graphite brushes 
  • Carbon brushes 
  • Fractional horsepower (FHP) motors
  • Traction Brushes

Exclusive Built-In Wear Indicator

An optional wear device is available with selected constant force springs to easily detect when carbon brush should be replaced.

Spring Repair and Replacement

We make it easy to replace the springs on your existing clips. Just send in the old clips and we will put on new rollers/springs. Make sure you include an old brush or part number, the brush size, style, and RPM to determine the spring force.

Measuring Spring Force

Measure spring force accurately with Helwig Carbon’s high performance, hand held, digital scale. It includes a large easy to read LCD display and attachments for both constant force and torsion type springs. Watch our Measuring Spring Force video below.

RECOMMENDED RANGE OF SPRING PRESSURES

spring pressure brush wear graph

Having the proper spring pressure is as important as the grade of brush. See below for a chart showing the proper spring pressure for the different types of applications.

Brush TypePounds Per Square InchGrams Per Square Centimeter
Industrial D.C. Applications4.0-6.0280-420
High Speed Turbine Rings; Soft Graphite Grades2.5-3.5170-240
Metal Graphite Brushes4.5-5.5310-390
FHP Brushes4.0-7.0280-490
Traction Brushes5.0-8.0350-560

Top and bottom bevels contribute to loss of spring pressure.

Angle in DegreesLoss of Force
50.40%
101.50%
206.00%
259.40%
3013.4%
3518.10%
4023.40%

 

 

Learn about how to
measure spring force

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