Double layer hole spiral inner retaining ring (medium load) is an axial positioning component for holes made of two layers of metal strip spiral coils, designed for medium load scenarios with axial forces of 1500-4000N (30% -50% lower than high load double-layer retaining ring, but 50% -100% higher than single-layer medium load retaining ring). Its structure is supported by two layers of strip materials, which work together to ensure load-bearing capacity while controlling overall thickness and cost. It is a balanced solution with better stability than a single layer and lower cost than a high load double layer.
Material and Performance
Material selection:
The main materials are 60Si2Mn spring steel (which balances strength and toughness, suitable for conventional medium loads) and 304 stainless steel (medium strength+corrosion resistance, suitable for humid environments). Some scenarios can choose 420 stainless steel (higher hardness, slightly better wear resistance). Matching material performance with load requirements to avoid cost waste caused by "excess performance".
Core performance advantages:
·Suitable for medium load bearing capacity: For example, a 60Si2Mn double-layer retaining ring with a diameter of 40mm can withstand axial forces up to 2500-3000N, and can stably handle small and medium-sized gear meshing and medium pressure hydraulic thrust (such as hydraulic systems with working pressures of 8-16MPa).
·Fatigue resistance and stability: Under cyclic loads (such as periodic axial forces on motor bearings), the fatigue life of the double-layer structure is 1.2-1.5 times that of a single-layer retaining ring, making it less prone to "loosening" due to long-term vibration (such as positioning of water pump impeller holes).
·Installation friendliness: Moderate thickness (20% -30% thinner than high load double-layer), can be installed using conventional double-layer retaining ring pliers, with low extrusion stress on the hole wall, suitable for medium load components with thin hole walls (such as hole positioning in aluminum alloy shells).
Core strengths
·Balance between cost and performance:
High load double-layer retaining rings save material costs and bear more than 50% more load than single-layer retaining rings. They are especially suitable for medium load equipment purchased in bulk (such as small and medium-sized machine tools, conventional hydraulic systems), balancing reliability and economy.
·Resistance to impact and vibration:
The two-layer strip forms an "elastic buffer", which reduces the peak stress by 30% compared to a single-layer retaining ring under instantaneous impact (such as axial impact during equipment startup/shutdown), making it suitable for medium load scenarios with intermittent impact (such as bearing hole positioning in small crushers and vibrating screens).
·Flexible installation and maintenance:
No special heavy tools are required, ordinary retaining ring pliers can be installed; The performance of repeated disassembly and assembly is better than that of single-layer retaining rings (which can be reused 2-3 times), reducing the replacement cost during equipment maintenance (such as regular maintenance of production line equipment).
·Strong compatibility:
Wide range of compatible aperture (20mm -150mm), can directly replace single-layer retaining rings of the same specification (without modifying hole or groove size), making it convenient for customers to upgrade the positioning reliability of existing equipment (such as replacing single-layer retaining rings of old equipment with double-layer ones to improve stability).
Typical Applicable Scenarios
·General Machinery: Positioning of spindle bearing holes for small and medium-sized lathes and milling machines (to withstand moderate axial forces caused by cutting forces), and limiting of impeller holes for blowers (to cope with continuous rotating vibrations).
·Medium pressure hydraulic/pneumatic equipment: hydraulic cylinders with a working pressure of 8-16MPa (such as cylinders in small injection molding machines and packaging machines), and axial fixation of pistons in pneumatic actuator cylinders.
·Agricultural and engineering machinery: gear positioning in tractor gearbox, fixing of hydraulic pump components for small loaders (suitable for outdoor dust and vibration environments).
·Household appliances and industrial equipment: positioning of motor bearing holes for large compressors, limiting of components inside elevator traction machines (requiring long-term stable operation to avoid frequent failures).
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