MOOG Patented Cover Plate & Belleville Washer

Patented Cover Plate

Deflection (or looseness) in the socket is a common symptom of ball joint failure. Looseness develops as bearing surfaces wear. Eventually the looseness will have adverse effects on the vehicle, causing uneven tire wear, noises, and steering wandering. MOOG’s patented pressed-in cover plate minimizes socket looseness to maximize socket life. Combined with a Belleville washer spring preload, this technique provides a consistently tight socket, when new, that maintains the like-new steering feel longer.

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• Eliminates excessive ‘lash’ while allowing adequate assembly clearance, and controls component high-side tolerance “stackup” to prevent binding.
• Holds axial clearances to near-zero lash.
• Axial and radial deflection consistency is more precise than conventional closure methods

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Belleville Washer Technology

Ordinary Belleville washers can shatter after repeated cyclic loading, creating excessive clearance in the socket. MOOG Belleville washers are stress optimized to maintain consistent preload force between the cover plate and bearing while withstanding years of cyclic loading. That keeps socket clearances tight to reduce bearing wear for long socket life.

• MOOG Belleville spring-steel washers apply 100 lbs. of force or more to minimize socket clearance and promote long bearing life.
• The Belleville washer absorbs impacts, minimizing wear to the stud and bearing. 
• Minimized wear results in consistent operation of the joint, maintaining wheel alignment to extend tire life and keep steering tight, enabling precise handling.

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While similar in appearance, the two types of spring washers suit different applications.

Disc Springs and Belleville Washers are both conically-shaped spring washers typically made from spring steels and designed to be loaded axially. Both can provide a higher degree of force in a relatively compact area as compared to coil springs or wave springs.

While the terms “Disc Springs” and “Belleville Washers” are often used interchangeably, there are some technical, design and application differences between the two products:

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Belleville Washers are primarily used in heavy duty applications fastened together with a bolt where the load is considered static. Disc Springs can be statically loaded either continuously or intermittently, or dynamically subjected to continuous load cycling. Unlike Belleville Washers, Disc Springs are designed specifically to provide a repeatable force-travel relationship and have a long and predictable fatigue life in dynamic or cycling applications.

Disc Springs are commonly found in a variety of applications including pressure controls and regulators, vehicle braking systems, valves, shock absorbers, clutches, friction assemblies, and joints where thermal / weight cycling occurs. Disc Springs can be used as a single piece, or combined together into different configurations in stacks to achieve the desired force-deflection performance.

A defined list of standard Disc Spring sizes and associated load and deflection characteristics is available in DIN EN 16983 (formerly DIN 2093).

Selecting the most appropriate Disc Spring or Disc Stack configuration can be challenging. It is recommended that designers partner with experts in Disc Spring Application Engineering to determine the optimum Disc Spring for a particular application.

For information about fatigue life of Disc Springs, read the SPIROL White Paper: How to Calculate the Estimated Fatigue Life of Disc Springs

View SPIROL’s Disc Spring Design Guide for specifications and helpful tips for design engineers, or download 2D/3D drawings for your assembly at Shop.SPIROL.com.

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Nicholas Bunt is a product specialist with SPIROL International Corporation

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