Torsional rigidity of freewheel mechanisms in drives

Sharkov, O. V.; Koryagin, S. I.; Kalinin, A. V.

doi:10.3103/s1068798x17110144

Cited by 3 publications

(3 citation statements)

References 1 publication

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“…It is a quasi-static approach providing sufficient precision at the system level, seen as given, as it is state of the art. The engine freewheel's rigidity is similar to that in the literature (compare [29]) and thus defined as a plausible approach. In contrast, the rider's freewheel is locked via form fitting when motor torque is applied, which does not lead to additional rigidity, and hence neglect is assumed to be valid.…”

Section: Verification Of the Methodsmentioning

confidence: 97%

“…Moreover, parametric excitations through time-variable stiffness result. This is the case of the tooth meshing (compare [27]), the torsional rigidity of the freewheel (compare [29]) and the load dependency of the bearings. The electromagnetic motor forces are contingent upon the current position of the shaft, which, in its turn, relies on all the preceding effects.…”

Section: Verification Of the Methodsmentioning

confidence: 99%

“…The engine freewheel's torsional rigidity depends on the deflection angle related to the transferred torque T Freewheel [29]. This load-dependent stiffness characteristic varies with larger deflection angles, leading to a parametric excitation in the system (comparable to [30]).…”

Section: Excitation Effectsmentioning

confidence: 99%

See 2 more Smart Citations

A Novel Approach to Predict the Structural Dynamics of E-Bike Drive Units by Innovative Integration of Elastic Multi-Body-Dynamics

Steinbach,

Lechler,

Kraemer

et al. 2023

Vehicles

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This paper presents a novel approach to address noise, vibration, and harshness (NVH) issues in electrically assisted bicycles (e-bikes) caused by the drive unit. By investigating and optimising the structural dynamics during early product development, NVH can decisively be improved and valuable resources can be saved, emphasising its significance for enhancing riding performance. The paper offers a comprehensive analysis of the e-bike drive unit’s mechanical interactions among relevant components, culminating—to the best of our knowledge—in the development of the first high-fidelity model of an entire e-bike drive unit. The proposed model uses the principles of elastic multi body dynamics (eMBD) to elucidate the structural dynamics in dynamic-transient calculations. Comparing power spectra between measured and simulated motion variables validates the chosen model assumptions. The measurements of physical samples utilise accelerometers, contactless laser Doppler vibrometry (LDV) and various test arrangements, which are replicated in simulations and provide accessibility to measure vibrations onto rotating shafts and stationary structures. In summary, this integrated system-level approach can serve as a viable starting point for comprehending and managing the NVH behaviour of e-bikes.

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Section: Verification Of the Methodsmentioning

confidence: 97%

Section: Verification Of the Methodsmentioning

confidence: 99%

See 1 more Smart Citation

A Novel Approach to Predict the Structural Dynamics of E-Bike Drive Units by Innovative Integration of Elastic Multi-Body-Dynamics

Steinbach,

Lechler,

Kraemer

et al. 2023

Vehicles

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Effect of wedge coupling in smooth cylindrical surfaces contact

Sharkov

Koryagin

Великанов

2018

IOP Conf. Ser.: Earth Environ. Sci.

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Analysis of the Conditions for the Contactless Movement of Eccentric Freewheel Mechanisms

Kalinin

2021

PoHEI.MB

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Freewheel mechanisms are used in kinematic chains of technical systems of a various functionality. When such mechanisms freewheeling, it is necessary to ensure that there is no contact of their working elements to reduce friction losses and wear. At the same time, it is necessary to ensure the minimum value of the idling angle affecting the accuracy and response time of the kinematic chain in which the mechanism is installed. The task of analyzing and determining the geometric conditions allowing ensuring a radial gap between the working elements of the eccentric freewheel mechanisms with free-running engagement has been set. To solve this problem, a design scheme is proposed and a mathematical model describing the relationship between the geometrical parameters of the mechanism is obtained. The nature of the influence of the basic geometric parameters (eccentricity, radial clearance, modulus, etc.) on the value of the idling angle is established. It is shown that when designing, the values of the module and the gap should be chosen as the minimum permissible, taking into account the load capacity and the assembly conditions. The eccentricity can be assigned based on the requirements of the manufacturing technology.

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Torsional rigidity of freewheel mechanisms in drives

Cited by 3 publications

References 1 publication

A Novel Approach to Predict the Structural Dynamics of E-Bike Drive Units by Innovative Integration of Elastic Multi-Body-Dynamics

A Novel Approach to Predict the Structural Dynamics of E-Bike Drive Units by Innovative Integration of Elastic Multi-Body-Dynamics

Effect of wedge coupling in smooth cylindrical surfaces contact

Analysis of the Conditions for the Contactless Movement of Eccentric Freewheel Mechanisms

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