Load carrying capacity analysis of elastic retaining rings for shafts Industrial solutions

A shaft elastic retaining ring, also known as a shaft clamping spring, is an essential mechanical fastener used to fix the components or assemblies on the shaft and can withstand a certain amount of axial force. Shaft elastic retaining ring can rely on mold stamping molding or line steel winding molding; generally, a ring-shaped structure for axial limit; in the transmission system axis system structure design, shaft elastic retaining ring because of its compact structure is easy to disassemble and so on the advantages of a large number of applications. Its scope of application is still expanding; shaft elastic retaining ring reliability directly affects the reliability of the entire transmission system and safe operation.

Shaft elastic retaining ring in working condition should be able to rely on the retaining ring's elasticity and its matching groove size difference in the bottom of the groove with the shaft together with the rotation; otherwise, it will cause the retaining ring and the bottom of the groove of the relative movement of the relevant parts damage or failure, or even lead to the inability of retaining ring fall off. At present, for the design of shaft elastic retaining ring, mainly based on the retaining ring and matching shaft with the relevant size, relying on experience or reference to existing product design, selection, if the retaining ring parameters are not correctly designed, selection of deviation will make the retaining ring and the spring groove with improper adjustment of the clearance, may lead to the retaining ring in the working process, vibration or slip, or even fracture or fly out in severe cases. This design has been unable to meet the needs of modern precision machinery. Based on the theoretical analysis of the structure of a typical shaft elastic retaining ring, this paper gives the calculation formula and checking method of the bearing capacity of the retaining ring, which can be used as a reference for relevant designers.

1. Analysis of bearing capacity of shaft elastic retaining ring: the bearing capacity of shaft elastic retaining ring is one of the important indexes for evaluating its performance, which can reflect the comprehensive performance of the retaining ring to a large extent when shaft elastic retaining ring is subjected to excessive pressure or external force, it will cause severe deformation of retaining ring. The bearing capacity analysis of the shaft elastic retaining ring needs to calculate the bearing capacity FN of the groove and the bearing capacity FR of the retaining ring, respectively. The final bearing capacity of the retaining ring depends on the smaller values of the two.

2. Analysis of bearing capacity of groove: The bearing capacity of the shaft elastic retaining ring is closely related to the structure, material, and heat treatment of its matching shaft; when selecting a retaining ring, the design of the shaft system must be considered.

3. Load-bearing capacity analysis of retaining ring: the load-bearing capacity of the retaining ring is not only related to the structure of the matching shaft but also the structure, material, and surface treatment of the retaining ring itself. As the shaft elastic retaining ring needs to withstand a specific axial force, the material selection is used in high-grade spring steel. In contrast, for appropriate surface heat treatment, the particular design must be combined with applying the retaining ring and the phasing accessories' state, carefully considering its structure and material properties, such as modulus of elasticity, yield point, elongation, and hardening capacity. Shaft elastic retaining ring in the transmission system shaft system structure design can realize its axial limit and fixed role; retaining ring bearing capacity analysis and calculation is essential; only work in the elastic retaining ring permissible bearing capacity range to realize the designer of its functional requirements.

Shaft elastic retaining rings, as an essential component of the primary fasteners from a variety of industrial machinery, are an indispensable part of the study of its bearing capacity for the optimization of the design of the retaining ring, the user's selection, the transmission system of the assembly performance has a significant impact. Although the proportion of shaft elastic retaining ring in the design is tiny, once the loss caused by the dislodgement of a large, it should be the bearing capacity of the checking calculations, combined with the use of working conditions, select a reasonable safety factor, so that the design to meet the use of requirements.

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