Seal Testing in Aerated Lubricants

Petit, Joan; Fewkes, Roy; O'Brien, Cheryl

doi:10.4271/2011-01-1209

Cited by 2 publications

(1 citation statement)

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“…In the case of the FKM, its hardness variation exceeds the Ford, Allison Transmission, and Dexron VI specifications (+5 ShA) after 336 h for oils A, B, and C, and also after 504 h for oil D. The FKM also exceeds the GM specifications (+6 ShA) for oils A, B, and C after 504 h, and for oil D after 672 h. In addition, the FKM exceeds the Allison TES 439 specifications (+7 ShA) for oil B after 504 h and for oil C after 672 h. On the contrary, the FKM fulfilled the Ford Mercon V specifications (limit value: −8 ShA points) during the whole test and for all the oils tested. The results in Petit et al [22] confirm what is shown in Figure 2, as they obtained a slight hardening of FKM after prolonged aging in lubricants at 150 • C.…”

Section: Changes In Hardnesssupporting

confidence: 76%

Automatic Transmission Fluids in Electrified Transmissions: Compatibility with Elastomers

et al. 2022

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The location of the electric motor (EM) inside the transmission in an electric vehicle requires the compatibility of the automatic transmission fluids (ATFs) with the materials of the EM and the transmission. This work studies the compatibility of four conventional ATFs with three elastomers: fluoroelastomer (FKM), ethylene-propylene-diene monomer (EPDM), and vinyl-methyl silicone rubber (silicone). Changes in volume, hardness, tensile strength, and elongation at break of the elastomers after aging in the ATFs were measured, and additional Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and thermogravimetric and derivative thermogravimetric (TGA and DTGA) tests were performed. The four ATFs showed high or medium compatibility with FKM and silicone, and low compatibility with EPDM. This low compatibility was related to changes in the composition and crystalline structure of the elastomer. The non-compatibility of the EPDM with the oils from Group III was also proven.

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Section: Changes In Hardnesssupporting

confidence: 76%