Difference betweenstatic loadanddynamic loadPDF

If your wheel bearing has begun to wear down and metal-on-metal contact without enough grease to lubricate it properly, you will experience vibrations in your steering wheel. As the metal bearings start to wear down, there will be more play in the wheel bearing, causing them to vibrate.

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The dynamic load capacity is used to determine the rated life of a rolling element bearing. This life is commonly referred to as the L10 life, because it is the life that 90 percent of a group of identical bearings is expected to achieve under set conditions of load and speed.

Durability & Performance - Hub bearings use high-quality rubber to optimize the seal’s performance and durability against high temperatures and weathering.

Rolling element linear bearings, such as round shafts and bushings, profiled rail guides, crossed roller slides, and even ball screws, have two load capacity specifications — dynamic load capacity and static load capacity — which are based on different operating parameters and performance criteria and are independent of each other. To accurately size and select a rolling element linear bearing or ball screw, it’s essential to understand the differences between them and when each one is used.

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If you notice an unusual noise coming from your wheel at moderate speeds, a few things could be wrong. Your lugs could not be tight, your brakes may be dragging, or your wheel bearing may be bad. It is often hard to diagnose a noise at moderate speeds, but if you have inspected your brakes and checked your lug nuts, which are both good, you most likely have a bad wheel hub.

The basis of the L10 life for linear bearings is important to note — especially when comparing linear guides from different manufacturers, or even of different series from the same manufacturer. If a linear guide whose dynamic load capacity is based on 100,000 m is being compared to a linear guide whose dynamic load capacity is based on 50,000 m, one of the following conversions should be applied: Divide the 50,000 m load capacity by 1.26 OR multiply the 100,000 m load capacity by 1.26. (This article explains how the 1.26 conversion factor is derived.)

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A wheel hub, or wheel bearing, is a component that keeps your wheel attached to your vehicle while allowing the wheels to turn freely for safe steering. This is also vital to a vehicle’s anti-lock braking and traction control systems. The wheel hub bolts to the steering knuckle and allows for a brake rotor and wheel to be attached to it via studs and lug nuts. When your wheel hub goes bad, it can cause various issues that affect your steering and acceleration. Today, we will look at 4 signs of a bad wheel hub.

GSP offers some of the highest quality wheel hubs in the industry. GSP offers both wheel hub and knuckle hub assemblies.

Premium Materials - To ensure a smooth surface, free from defects, burrs, and cracks, all bearing housings are manufactured with polyamides for added impact toughness and age resistance.

Static loadanddynamic loadexamples

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Quality Control - In order to increase longevity and resist abrasion, GSP’s ball bearings are spaced precisely to the appropriate clearance for smooth rotation.

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Keep in mind that the rated L10 life is a theoretical life based on a clean environment, proper lubrication, and correct mounting. The bearing’s actual operating life can be negatively affected by contamination, lack of lubrication, improper mounting, and other factors.

Vulcanization Process - All Hub Assemblies go through a vacuum vulcanization process to enhance the structural integrity of the seal and rubber components.

A metal-on-metal screeching at low speeds is usually diagnosed as brake pads that need to be replaced. While this is the reason in many cases, if you know your brakes are new or don’t need to be replaced, you can usually narrow it down to your wheel hub. A wheel hub that has lost its grease and is wearing the bearings with no lubrication will produce a loud metal-on-metal sound at low speeds.

Static load capacity, C0, is the amount of load a bearing can withstand before the sum of the ball and raceway deformation equals 0.01 percent of (0.0001 times) the ball diameter, as defined by ISO 14728-2. Static load capacity is almost always higher than dynamic load capacity because its limitation is plastic deformation of the ball and raceway material, which occurs when the load is applied to the bearing in a static (non-moving) or slow-moving state.

Dynamic load capacity, C, is based on empirical testing in which a load that is constant in magnitude and normal to the load-bearing surfaces allows the bearing to achieve a defined travel distance (linear guide) or number of revolutions (ball screw) without fatigue. Fatigue is defined as the presence of flaking on the surface of the rolling elements or the raceways.

Filed Under: Applications, Ball + lead + roller screws, Ball + roller guides, Crossed-roller slides, FAQs + basics, Linear bearings

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Lastly, if your Anti-Lock Brake Light or Traction Control Light illuminates and you are experiencing vibrations in your steering wheel, you most likely have a bad wheel bearing. In most modern cars, a wheel bearing that has gone bad will cause the system to trip. This will cause an ABS speed sensor code to be stored and your dash light to illuminate to indicate that you have an issue.

Dynamic load capacity and the L10 life calculation are defined by the ISO 14728-1 standard for linear bearings, and by the ISO 3408-5 standard for ball screws. The ball screw standard specifies that dynamic load capacity is based on an L10 life of 1 million revolutions. However, the linear bearing standard allows the dynamic load capacity to be specified for an L10 life of either 50,000 m or 100,000 m.

Static loads are often the result of shocks to the bearing that are unplanned and difficult to quantify. Therefore, linear bearing and ball screw manufacturers recommend applying a static safety factor, depending on the type of application and the operating conditions. The static safety factor is the ratio between the basic static load rating and the maximum combined static load applied to the bearing. It can range from 2 for smooth operating conditions with a low risk of vibrations, to as high as 5 or 6 for applications that may be subjected to severe shock loads.