Dongfeng Renault engine parts connecting rod lower bearing shell D5010224659

Crafted with a high-performance dual-metal structure, the bearing shell delivers superior durability for Dongfeng Renault’s high-load engine operation. The base layer is made of low-carbon steel (1008 steel) that provides structural rigidity, preventing deformation under combustion-induced forces (up to 80 kN per rod). The sliding surface features a 0.03mm-thick lead-tin-copper alloy (PbSnCu) overlay—selected for its excellent anti-friction properties and ability to absorb minor contaminants (e.g., tiny metal particles). Unlike single-metal bearings that wear quickly, this dual-layer design resists scuffing (even during oil starvation events) and extends service life by 40% compared to standard bearings. Rigorous wear testing confirms the shell endures 150,000+ km of operation without excessive material loss, ensuring reliable performance in heavy-duty or high-mileage engines

Engineered with micron-level precision, the bearing shell maintains strict dimensional tolerances to ensure the critical oil clearance between the shell and crankshaft journal. The inner sliding surface is honed to a surface roughness of Ra ≤ 0.2μm, creating a smooth texture that minimizes friction while retaining a thin oil film (5–10μm) for lubrication. The shell’s radial thickness variation is controlled to ≤ 0.003mm, ensuring uniform oil clearance around the crankshaft journal—preventing localized metal-to-metal contact that causes scoring. This precise clearance design also optimizes oil flow through the bearing, carrying away heat and contaminants to reduce thermal stress on the connecting rod and crankshaft. Unlike low-precision bearings that disrupt oil flow, this shell ensures consistent lubrication even at high engine speeds (up to 5,500 RPM)

The bearing shell features a precision-machined oil groove pattern tailored to Dongfeng Renault’s engine lubrication system. A circumferential main groove (1.5mm wide, 0.5mm deep) runs along the midpoint of the shell’s inner surface, paired with two axial sub-grooves that direct oil to the shell’s end faces. This design ensures maximum oil distribution across the sliding surface, even during low oil pressure conditions (e.g., cold startup). The grooves also act as reservoirs, storing oil to maintain lubrication during brief oil supply interruptions. Unlike bearing shells with minimal or poorly placed grooves, this optimized design reduces friction-induced heat by 15% and prevents dry startup wear—critical for extending the life of both the bearing and crankshaft journal. Additionally, the groove edges are chamfered (0.1mm radius) to avoid oil flow restriction and minimize stress concentration

Each bearing shell undergoes rigorous quality control to meet Dongfeng Renault’s engine standards and international bearing specifications (ISO 4389). Key tests include: dimensional verification via coordinate measuring machine (CMM), hardness testing (HRC 50–55 for steel base, HV 25–35 for alloy overlay), oil groove geometry inspection, and friction coefficient testing under simulated engine conditions. The shell is manufactured in an IATF 16949 certified facility, with each unit traceable to its production batch and raw material source. It is also compatible with Dongfeng Renault’s recommended engine oils (5W-30/15W-40, API CK-4) and maintenance schedules, ensuring optimal performance when paired with OEM-grade lubricants. Backed by a 24-month warranty against manufacturing defects (e.g., overlay delamination, dimensional inaccuracies, or groove damage), it provides Dongfeng Renault engine owners with reliable bearing performance and long-term peace of mind