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Technology

Technology Basics

The shock bushings are used to fix the shock absorber in the frame. Over the plain the pivoting movements of the damper can be added during compression and out. This should be durable and shock eye camp at the same time easily.

The standard

For many years it is standard shower or DP4 bearings on a steel or aluminum shaft to be used without lubrication - at a significant disadvantage: the whole combination and execution does not correspond to the prior art, it can only work half way when the swing angle is small. The bearings used have only a very thin and soft top layer. This is often damaged during assembly and pushed in the operation of the friction and rubbing. After that comes with the layer of sintered bronze, this is harder than the aluminum shaft. Now begins the wear of the shaft. Quickly creates large clearance and thanks to metal to metal contact, it also rattles quite well.

Some damper manufacturers were therefore partially spherical bearing. The cons: They are heavy, expensive and not very smooth.

In the following figure we recognize how thin the top layer well with standard bearings (Fox, Manitou, Rock Shox, etc.). The total thickness of the bearing to the damper is only 1.2 mm!
Pile

The following figure shows the wear traces of the damper bearing (the rolled-out) from my Fusion Whiplash after about 1500 km:

Scuff marks

Another problem is the dimensional stability of the mounting sleeves. These usually have no necessary small play, but a cover. The mounting sleeves have to be pressed and are then difficult to move. This is often already pressed a significant amount of ultra-thin layer Balances from the camp. The result is faster wear and a poorer response of the damper. Another major drawback is the low hardness of the shaft, resulting in a high coefficient of friction and wear of the resulting wave.

This figure shows the camp belonging to the above mounting sleeve:

Mounting location Huelse

Improvement

It replaces the existing mounting sleeves because of dimensionally stable mounting sleeves made of high strength aluminum with a hard anodised surface. This not only optical-quality ceramic surface is almost wear-free and has much better frictional properties. These measures alone, the response of the damper improves significantly.

Here is a picture of anodized mounting sleeves:
Hard anodized sleeve

here in the damper (matching color):
Hard anodized sleeve

and installed in the wheel here:
Hard anodized sleeve

Site 2 - The bearings

Come here with my jacks made of special plastic bearings for use. These have, if you choose the right materials, a lot of advantages:

  • - Increased service life
  • - Consistently low friction coefficients (= wall thickness of the wear layer thickness!)
  • - Much more suitable for rotary movements
  • - Improved vibration damping and isolation as in multilayer bearings
  • - Lower weight (about 4 grams)
  • - Considerably cheaper, depending on the material