Technical parameter requirements for rubber seals in loader engines
The technical parameter requirements of rubber seals in loader engines mainly include the following aspects:
Material Selection
Rubber seals should have good medium resistance, heat resistance, oil resistance, aging resistance, and other characteristics to adapt to complex media (such as lubricating oil, diesel, water vapor, etc.) and temperature changes (-40°C to 140°C) in the engine working environment.
Commonly used materials include fluoroelastomer, nitrile, silicone rubber, and ethylene acrylic rubber.
Physical properties
Seals need to have good mechanical strength, including tensile strength, elongation at break, hardness, and other indicators to ensure their stability and durability under high pressure and high-temperature conditions.
The seal should have good compression resilience (compression rate ≥ 15%, rebound rate ≥45%) to adapt to the unevenness of the sealing surface and improve the sealing effect.
Sealing performance
The seal should have good sealing and elasticity, and be able to fit closely with the pipe surface or sealing surface to prevent leakage.
In the assembly process, the seal should ensure that there are no bubbles, slag inclusions, cracks, or other defects, the surface should be smooth and flat, and the roughness value should not be greater than 3.2μm.
Process parameters
The curing time of silicone rubber flat sealant should be controlled within 3-20 minutes, the curing depth should be ≥0.5mm, the extrusion should meet the specific pressure requirements (≥30-40kPa), and have good thermal stability.
The dimensional accuracy of the seal shall comply with relevant standards, such as GB/T 3452.1 and GB/T 1184, to ensure assembly accuracy.
Durability & Aging
Seals need to have good aging resistance and long-term stability to maintain initial performance over the life of the engine (e.g. 180 hours).
Under extreme conditions, seals need to be creep and relaxation-resistant to ensure long-lasting sealing performance.
Scope of application
Rubber seals are widely used in the hydraulic system, air system, water system, and other key components of the loader to ensure their reliability and sealing in harsh environments.
For different application scenarios, such as engine oil pans, cylinder head covers, etc., the material and design of the seals need to meet specific requirements.
In summary, the technical requirements of rubber seals in loader engines cover many aspects such as material selection, physical properties, sealing performance, process parameters, durability, and scope of application to ensure their reliability and sealing performance in complex working environments.
