Spiral outer retaining ring for shaft (heavy load)

 

 

 

Spiral outer retaining ring is an elastic fastening part used for axial positioning of hole type parts, while the "heavy load type" is a reinforced version designed for high axial load scenarios - it is formed by spiral winding a single high-strength flat steel wire in an open ring shape, and achieves axial positioning of components such as bearings, flanges, and heavy-duty gears by embedding them into the hole wall groove.

Its core feature is that, while maintaining the advantages of the "ear free structure and elastic adaptation" of the spiral retaining ring, it can withstand axial forces far exceeding those of light load types through material upgrades, section optimization, and structural strengthening. It is an efficient solution for "heavy duty positioning" in small and medium-sized hole systems.

 

Core structure and performance advantages

·High strength flat steel wire, doubling the load-bearing capacity

Using thickened flat steel wire (with a cross-sectional size usually ranging from 2-8mm in thickness and 3-12mm in width, which is more than 50% larger than the light load type), the material is high-strength alloy spring steel (such as 50CrVA, 60Si2CrA) or ultra high strength stainless steel (such as 17-4PH). After "quenching+medium temperature tempering" treatment, the tensile strength can reach 1600-2000MPa, and the axial bearing capacity can reach 15-30kN (2-3 times that of the same specification light load type), which can directly withstand the impact load of heavy equipment.

·Optimize spiral parameters for more stable force distribution

The number of spiral turns is increased to 2-4 turns, and the gap between turns is reduced to 0.05-0.2mm, resulting in an overall increase in rigidity. During installation, elastic deformation is used to shrink and embed into the groove, forming a "multi circle line contact" with the inner wall of the groove, which can evenly distribute axial forces and avoid local stress concentration (such as in the positioning scenario of heavy-duty motor bearing seat holes).

·Wear resistant and fatigue resistant design

Surface phosphating, galvanizing (Dacromet treatment) or polishing treatment enhances wear resistance (surface hardness ≥ 55HRC) and corrosion resistance; The small gaps between the spiral coils reserve space for thermal expansion and contraction, and can maintain elastic stability in an environment of -40 ℃~150 ℃. The fatigue life (≥ 10 ⁶ cycles) meets the long-term operation requirements of heavy equipment.

·No ear structure, suitable for compact space

Compared with the light load type of the same specification, the outer diameter only increases by 15% -20%, but there is no need to reserve disassembly ear space like rigid retaining rings (such as elastic retaining rings for holes), especially suitable for heavy components with protruding hole ends and limited installation space (such as hydraulic cylinder barrels and large reducer housing holes).

 

Applicable scenarios

The core adaptation scenario for heavy-duty spiral outer retaining rings is a hole system with high axial load, compact space, and vibration impact. Typical cases include:

·Heavy machinery: such as bearing seat hole positioning for mining crushers and flange limit for crane drum shafts;

·Power equipment: fixing of bearing rings for large motor end cover holes and components for diesel engine cylinder body holes;

·Hydraulic and engineering machinery: piston limit of hydraulic cylinder barrel, gear shaft positioning of loader gearbox;

·Special environmental equipment: offshore wind turbine gearbox (17-4PH stainless steel anti salt spray), metallurgical rolling mill (high-temperature alloy resistant to environments above 300 ℃).