TENSIOtec® - fastening solutions for engine attachments
TENSIOtec® overview:
- Weight savings through desing engineering and material selection
- Combination with ALtracs® Plus screw facilitates further savings potential
- Optimised contact surface, resulting in minimised surface pressure
- Protection of the plastic component
- Captive assembly for transport and installation
In order to utilise the many advantages of thermoplastic materials in vehicle motor engineering, the TENSIOtec® compression limiters are inserted into the components. They can take up the clamp load without damaging stress to the plastic.
"Compression limiters" comprise a system of captive screw and sleeve. Typical applications for TENSIOtec® are the fastening of cylinder covers, plastic oil pans or intake modules.
TENSIOtec® compression limiters take up the clamp load from the screw joint and maintain it without applying stress to the surrounding, mostly thermoplastic material. TENSIOtec® compression limiters are an important contribution to weight reduction, since they offer a weight advantage of up to 30% compared to common screw-bush-combinations. They are also able to fulfil important functions such as acoustic isolation or a support function for very low flange thickness.
Different versions of the TENSIOtec® compression limiter:
TENSIOtec® "standard" – without acoustic isolation of the component
This system establishes a radial tolerance compensation in the drill hole of the plastic part. The bush is kept in the drill hole through force closure. "Forming elements" for retention in the plastic part are not necessary.
An assembly of the compression limiter against the demoulding direction of the part is possible without any problems.
TENSIOtec® "uncoupled" – with isolation of structure-born sound
For this version of the TENSIOtec® compression limiter the system is integrated into the seal below the plastic part. This system, consisting of screw, bush and damper, is used for vibration decoupled fastening. The clamping part is locked in place through clamping between the damper above the component and the seal below it. The clamp load of the joint is absorbed by the support element which does not touch the plastic part due to the decoupling.
TENSIOtec® "telescope" – for low flange thicknesses
Modern engine development requires a minimisation of the component height due to the tight installation space. EJOT developed a telescope compression limiter under the term TENSIOtec® "telescope", which meets these special requirements. This screw-bush system, which functions according to the telescope principle, is pressed into the drill hole of the plastic component where it establishes a radial tolerance compensation. Fixing of the TENSIOtec® "telescope" is done through force closure. Special feature of this system is the reduction of installation space and the additional weight savings.
