Test bench for valvetrain dynamics

Valve spring with applied strain gauges

Via a Polytech laser vibrometer, our test bench for valvetrain dynamics records the valve lift course and its deviations, the resulting valve speeds and closing speeds. In addition, we examine the valve spring contact forces and the (roller) rocker arm forces. Naturally, for us as valve spring suppliers, the tensions within the valve spring are of the utmost importance.  These tensions are recorded with strain gauges (DMS). Evaluation of the signals is performed on a state of the art data acquisition and analysis system. From the sum of all results, we can deduce whether the selected valve spring design fulfills the specified requirements at all engine-relevant speeds. In addition, for further support, we supply our customers with high-speed recordings, e.g. to examine valve spring vibration behavior or valve rotation.

Analysis of natural frequency

Test bench for friction behavior

Test bench for friction behavior

In order to provide evidence of friction reduction in an optimized spring design, it is essential to provide adequate test facilities. Our own test bench for identification of the camshaft drive torques is an important element in the optimization process for valve springs. The combination of the new friction testing technology with the existing tools such as valvetrain simulation and dynamics measurement on the cylinder head is the key to optimal valve spring design.