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Friction Behavior of Pre-Damaged Wet-Running Multi-Plate Clutches in an Endurance Test

Gear Research Centre (FZG), Technical University of Munich, 85748 Garching, Germany
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Lubricants 2020, 8(7), 68; https://doi.org/10.3390/lubricants8070068
Received: 8 June 2020 / Revised: 26 June 2020 / Accepted: 27 June 2020 / Published: 30 June 2020
Wet-running multi-plate clutches should be prevented from failing due to the often safety-relevant functions they fulfill in the drive train. In addition to long-term damage, spontaneous damage is of particular relevance for failures. This paper focuses on the influence of spontaneous damage on frictional behavior in the later life cycle. The aim of the experimental investigations is to initially cause spontaneous damage in wet-running multi-plate clutches with sintered friction linings. For this purpose, three clutches are first pre-damaged in stage tests with different intensities, so that the first spontaneous damage (local discoloration, sinter transfer) occurs. In the second step, an endurance test is carried out with the pre-damaged clutch packs and a non-pre-damaged reference clutch. The friction behavior of the clutches during the endurance test is compared and evaluated. It shows that local discoloration and sinter transfer are no longer visible after the endurance tests. At the beginning of the endurance test, the values of coefficient of friction are higher over the entire speed range of the heavily pre-damaged clutches than with the slightly pre-damaged clutch and the non-pre-damaged reference clutch. At the end of the endurance test, it can be observed that the greater the pre-damage to the clutches is, the greater the coefficient of friction increases with decreasing sliding speed. View Full-Text
Keywords: friction behavior; wet friction clutch; damage behavior; spontaneous damage; experimental tests; continuous shifting tests friction behavior; wet friction clutch; damage behavior; spontaneous damage; experimental tests; continuous shifting tests
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MDPI and ACS Style

Schneider, T.; Voelkel, K.; Pflaum, H.; Stahl, K. Friction Behavior of Pre-Damaged Wet-Running Multi-Plate Clutches in an Endurance Test. Lubricants 2020, 8, 68. https://doi.org/10.3390/lubricants8070068

AMA Style

Schneider T, Voelkel K, Pflaum H, Stahl K. Friction Behavior of Pre-Damaged Wet-Running Multi-Plate Clutches in an Endurance Test. Lubricants. 2020; 8(7):68. https://doi.org/10.3390/lubricants8070068

Chicago/Turabian Style

Schneider, Thomas, Katharina Voelkel, Hermann Pflaum, and Karsten Stahl. 2020. "Friction Behavior of Pre-Damaged Wet-Running Multi-Plate Clutches in an Endurance Test" Lubricants 8, no. 7: 68. https://doi.org/10.3390/lubricants8070068

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