Durability of hypotrochoidal shaft-hub connections under rotating bending with static torsion

Influence of a Shaft Shoulder on the Torsional Load-Bearing Behaviour of Trochoidal Profile Contours as Positive Shaft–Hub Connections

“…A stress ratio of R = 0.2 was selected for the component tests, which corresponds to a pulsating torsional load. The obtained results are thus comparable to those of prior research, such as [6]. The test frequencies of the tests documented below corresponded to the set load horizon and were, therefore, variable.…”

“…The limit load cycle number was set to N G = 10 million load cycles. This value has become established in the field of form-fit connections, which fail due to frictional fatigue [6]. In the following procedure, the torsional notch effect number β τ could be determined from the achieved endurance limit τ tADK by recursively applying the calculation procedure in DIN 743-Part 1 [19].…”

“…It is known from numerical investigations in [2,6] that a slight interference U between the shaft and hub can have a positive effect on the stress state of the joint. In order to confirm this finding purely experimentally, a connection variant with a slightly oversized U of ξ = U/d a = 0.5‰ related to the circular tip diameter d a (see Figure 2) was also investigated.…”

“…Such connections have also found industrial interest and applications [2] in the recent years. In the field of simple hypotrochoids with only one eccentricity, which are standardised as so-called H-profiles according to DIN 3689 [5], great advantages have been observed regarding the dynamic load-bearing behaviour of these connections under rotational bending with static torsion [6].…”