Abstract
At present, increasing emphasis is being placed on low noise levels, especially in the automotive industry. One of the dominant sources of noise (and vibration) in vehicles (with an electric motor as well as an internal combustion engine) is the transmission system. In order to effectively reduce vibration and noise of gears and transmission systems, some important gear parameters should be determined / measured. One of these parameters is the static transmission error, which is addressed in this article. The evaluated parameter is the peak-to-peak value of the transmission error, which appears to be closely related to NVH (Noise Vibration and Harshness). The transmission error depends, inter alia, on the tooth macrogeometry (expressed by the contact ratio) and the tooth microgeometry (intentional tooth modifications), the influence of both has been analyzed and is presented in this article. The transmission error can be determined by virtual measurement (computationally) in software enabling finite element analysis or by technical experiments on a test rig. The results in this paper are based on the outputs of numerical simulations using the finite element method. This approach can be used at developing phase to find the optimal solution and to save a lot of time. In addition, no physical components are required and a wide range of arbitrary gear configurations can be analyzed. Nevertheless, the technical experiment is still necessary, thus the test rig will be designed/constructed in the near future, including the possibility of lubrication. The results will then be compared with numerical simulations.
Highlights
The way of transmitting mechanical energy by means of gears is very common in every industry, not excluding the automotive one
Besides the transmission error, which is calculated based on the outputs of the stress-strain analysis, the primary results of the analyses themselves can be evaluated
The computational approach by using the finite element method was used to determine the static transmission error. a relatively large number of configurations was analyzed in order to determine and verify the influence of various factors on the transmission error
Summary
The way of transmitting mechanical energy by means of gears is very common in every industry, not excluding the automotive one. Helical gears (Fig. 1) are most often used in vehicle gearboxes. As new automobiles are expected to run still quieter, their transmission systems must meet this. Gears are required to have a high load capacity, fatigue and service life, and to run as smoothly as possible without vibrations. The design process of gears becomes even more complicated, so the possibility of using numerical simulations is offered [1]. If the gear pair/gearbox has already been manufactured and has a higher noise level, it is advisable to proceed with a technical experiment to find out the reason, or just to determine the transmission error (TE) [2]
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