Reibungsverhalten nasslaufender Lamellenkupplungen  am Übergang Haftreibung – Gleitreibung

Meingaßner, G. J.; Pflaum, H.; Stahl, K.

doi:10.51202/9783181023099-159

Cited by 4 publications

(6 citation statements)

References 5 publications

(6 reference statements)

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“…Based on the results of current research [17,[21][22][23] about test procedures for wet multi-plate clutches, we designed two test procedures, shown in Fig. 3, which are suitable to characterize the friction (friction screening) and endurance behavior (long-term test) of the clutches.…”

Section: Test Procedures and Evaluation Methodsmentioning

confidence: 99%

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Friction behavior of innovative carbon friction linings for wet multi-plate clutches

Stockinger

Groetsch

Reiner³

et al. 2021

Forsch Ingenieurwes

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The torque transfer capability as well as long-term endurance are essential for wet multi-plate clutches. The quality of the torque transmission process largely depends on the tribological system consisting of friction pairing, lubricant and applied loads. The requirements on friction linings in wet multi-plate clutches increase continuously due to stricter CO2 reduction regulations and the demand of higher power densities.There is a lack of published data and information about the friction behavior of modern Carbon friction linings in wet multi-plate clutch applications, although these friction materials have successfully proven their performance capabilities over the last two decades in synchronizers. Therefore, this article presents results from experimental studies on the friction behavior of innovative Carbon friction linings carried out on a component test rig. Friction screening tests were performed with Carbon-fiber reinforced plastic (CFRP) and Carbon-fiber reinforced Carbon (C/C) linings in brake and constant slip operation. Furthermore, our research included long-term tests with different lubricants (engine/marine/tractor oil).Results show that modern Carbon friction linings can offer advantages over other materials. In the friction screening (brake and constant slip operations) and long-term tests, the torque transfer capability of both friction linings is very stable, even at high specific loads—sliding velocities near 30 m/s and axial pressures of 2.5 MPa. Influences of sliding velocity, pressure and lubricant on the friction performance are presented. Furthermore, the gradient of the Coefficient of Friction (CoF) curve usually decreases at the end of the engagement to enable good control and shift comfort.

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Section: Test Procedures and Evaluation Methodsmentioning

confidence: 99%

“…6). Circumferential thickness variations most likely cause oscillation of the CoF in S9 [22]. The increasing temperature during constant slip decreases the CoF.…”

Section: Test Procedures and Evaluation Methodsmentioning

confidence: 99%

Friction behavior of innovative carbon friction linings for wet multi-plate clutches

Stockinger

Groetsch

Reiner³

et al. 2021

Forsch Ingenieurwes

Self Cite

View full text Add to dashboard Cite

show abstract

“…An incremental encoder at the end of the shaft measures the rotational speed. Table 1 represents As shown in [29,30], the measurement accuracy of the KLP-260 is identified with regard to the rules of the Guide to the Expression of Uncertainty in Measurement (GUM) [31]. The determined uncertainty is illustrated in Table 2.…”

Section: Test Setupmentioning

confidence: 99%

“…Measurement accuracy of relevant technical parameters on the KLP-260 component test rig according to Strobl[29] based on Baumgartner[30].…”

mentioning

confidence: 99%

Influence of Water Contamination, Iron Particles, and Energy Input on the NVH Behavior of Wet Clutches

Wirkner,

Baese,

Lebel

et al. 2023

Lubricants

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The driving comfort and safety of the automotive powertrain are significantly related to the performance, lifetime, and functionality of the lubricant. The presented study focuses on investigating the performance loss of the lubricant due to water contamination resulting from environmental influences and iron particles originating from the wear of different machine elements. The main purpose is to determine critical factors that contribute to the degradation of the lubricant, and increase the tendency to NVH behavior, leading to adverse comfort losses to the respective user. Therefore, this performance loss is evaluated by test rig-based analysis of the friction behavior of wet clutches. Due to physical adsorption, a significant impact of water and iron contamination on the degradation of the lubricant is found, while the influence of the energy input is secondary.

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“…Table 1 shows the technical data of the test rig. The measurement accuracy of the test rig is determined by applying the rules of the Guide to the Expression of Uncertainty in Measurement (GUM) [24] and DIN EN ISO 14253-2 [25] to the ZF/FZG KLP-260 test rig as published in [33,34]. Table 2 summarizes the measurement accuracy for the FZG/ZF KLP-260 test rig.…”

Section: Experimental Setup and Data Collectionmentioning

confidence: 99%

Identification and Validation of Linear Friction Models Using ANOVA and Stepwise Regression

et al. 2022

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For wet disk clutches, the energy input is strongly influenced by its friction behavior. However, the friction behavior cannot be simulated and therefore is mostly derived from experimental data for specific clutch systems. This paper presents a new approach for the identification and validation of linear friction models using analysis of variance (ANOVA) and stepwise regression. Therefore, we use experimental data of three different friction systems with paper- and carbon-based friction lining. The designed experiments support an efficient parameter-based analysis of the friction behavior. The obtained models can be used as an input for thermal simulations, for example, but can also support a better understanding of the main influencing factors and are applicable to various friction systems. For validation, the obtained models are applied to measured data. A good correspondence between the simulated and measured friction behavior can be shown for speeds in the investigated operating range. The presented procedure can be easily adapted, for different factors and operation modes, as well as other applications.

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Reibungsverhalten nasslaufender Lamellenkupplungen am Übergang Haftreibung – Gleitreibung

Cited by 4 publications

References 5 publications

Friction behavior of innovative carbon friction linings for wet multi-plate clutches

Friction behavior of innovative carbon friction linings for wet multi-plate clutches

Influence of Water Contamination, Iron Particles, and Energy Input on the NVH Behavior of Wet Clutches

Identification and Validation of Linear Friction Models Using ANOVA and Stepwise Regression

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