Posts Tagged ‘tapered roller bearings’

Bearings in Mining Equipment

Friday, October 13th, 2017

A recent article in one of the more well-known mining magazines mentioned that the global mining market continues to grow and, in fact, it is blooming. This article stated that both underground and above ground mining equipment is expected to be sold for more than $30 billion by 2022.

What was very interesting however, about this article, was the fact that mining companies are continually eliminating outdated mining machines and replacing them with more modern up-to-date machinery. Even if they decide to keep the older machinery, most mining companies realize the benefits of using newer, more efficient solutions for the overhauling and replacing of parts.

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What Are Tapered Roller Bearings?

Friday, March 18th, 2016

Tapered roller bearings comprise of an outer ring, an inner ring, rollers, and a cage profiled to ensure even distribution of the load. At low to intermediate speeds, they have high axial and radial load capacities.

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Bearing Damage Analysis

Friday, December 5th, 2014

Today, we’re going to take you through the process of analyzing damaged tapered roller bearings. In other words, we’ll answer – what went wrong?

Tapered roller bearings have many applications, such as: agriculture, construction, and mining equipment, axle systems, gear box, engine motors, and reducers.

Stress can cause extensive damage to bearings if:

  1. They have inadequate or contaminated lubricant
  2. They were damaged or dropped during installation
  3. They were adjusted or installed improperly

First, let’s look at the bruising effect. Debris from other parts, inadequate sealing, or contaminated lubricant can leave small bruises or indentations along the raceway. This reduces the lifespan of the bearing, and is why ensuring cleanliness during installation is vital.

Another common cause of damage is moisture or water exposure. This moisture may enter the bearing during installation, or could be the result of fluctuating temperatures which forces the steel to sweat.

This moisture rusts or etches away at the bearing’s material creating dark lines around the raceway. We call this an “etching” effect. Chunks of the raceway material may be torn off by rollers during operation if the etched bearings continue to be used.

If during installation the bearing is dropped, be sure to inspect it for damage or cage deformation. A bent bearing cage is good reason to scrap it. The cage could also be damaged by compression during installation, which causes skewing and deformation.

It is also important to use the right tools when installing the bearing. A tool that is harder than the bearing’s material can cause deformation in the raceway that will result in spalling under the stress of operation. No hardened drifts, center punches, or brass bars.

Inadequate lubrication can cause heat or welding damage, typically showing up near the large end of the cone or the larger ends of the roller components, as these sections undergo sliding contact.

Peeling or micro-spalling is also due to inadequate lubrication and allows for rapid wearing away of the raceway material.

Excessive preload during adjustment can sometimes cause rapid spalling as well, allowing large chunks of material to be torn from the raceway and rollers due to the extreme heat.

Misalignment damage can be caused when excessive endplay is exercised. This will result in one-sided deep spalling along the raceway or cone.

The various causes of bearing damage all have one thing in common – human error. That’s why taking extra precaution, and slowing down when installing bearings is paramount.

For more information, watch this bearing damage analysis video by The Timken Company.

Timken – Wind Energy Animation

Friday, February 21st, 2014

Wind power refers to the conversion of wind energy into a useful form of energy. One good example would be the usage of wind turbines to yield electrical power, windmills to draw mechanical powers, windpumps for water pumping or drainage, or sails to propel ships.

Wind power is a wonderful substitute for fossil fuels. It’s abundant, renewable, widely distributed, and does not yield greenhouse gas emissions. In any case, it’s more environment-friendly compared to many other power sources.

Wind can be used to do work. The kinetic energy of the wind can be changed into other forms of energy, either mechanical energy or electrical energy.

Here are some Timken roller bearings at work showing how it’s done…

Is synthetic oil lubrication recommended for tapered roller bearings?

Friday, July 19th, 2013

Q: Do you recommend synthetic oil lubrication for tapered roller bearings? 

A: The usage of synthetic lubricants with tapered roller bearings is generally OK, assuming the lubrication has the right additives for your specific application requirements. There are cases wherein synthetic greases are superior to petroleum-based oils when it comes to their capacity to fight breakdown from mechanical and thermal conditions.

Nevertheless, it is good advice to always consult the original equipment manufacturer in regards to any change from a lubricant that is specified by them. Before you opt for synthetic oil grease for your application, touch base with your sales or service engineer so you can rest assured it is acceptable in your application.