Is there a hidden mystery behind the joint bearing code?
In mechanical design, although joint bearings are small in size, they bear the key tasks of complex loads and frequent swinging. Faced with a dazzling array of models such as GE, GAC, GX, etc., many engineers often feel confused: what exactly do these letters represent? In fact, each code accurately maps the structural type, functional characteristics, and applicable working conditions of the bearing.
Firstly, the combination of the first letters reveals the basic category of bearings: GE stands for radial joint bearings, which are suitable for applications mainly subjected to radial loads; GAC is an angular contact type that can simultaneously handle radial and unidirectional axial forces, and is commonly used in swing mechanisms that require a certain degree of inclination compensation; GX specifically refers to thrust type joint bearings, mainly used to withstand pure axial loads, such as lifting platforms or supporting hinges. Secondly, the numbers and suffixes in the code refine the size and detail design. Taking "GE 30 ES-2RS" as an example: "30" represents an inner diameter of 30mm; "ES" represents an outer ring with a single slot structure and a lubricating oil groove for easy lubrication and maintenance; 2RS "indicates that both sides are equipped with rubber sealing rings, effectively preventing dust and water.
It is worth mentioning that there is a practical mnemonic circulating in the industry: "There are 2 on both sides, no on one side" - that is, if you see "2RS", it means that both sides are sealed; If only labeled as "RS" or not labeled, it may only have one side or no seal, which helps to quickly determine the protection level.
Based on the structural characteristics, the GE · ES type is suitable for heavy-duty swing working conditions such as construction machinery connecting rods, which require regular maintenance at medium and low speeds due to its self-lubricating groove and slotted outer ring; The GAC · S type adopts an inclined raceway design, which can withstand composite loads and performs well in agricultural machinery steering knuckles or robot joints; The GX series, with its high axial rigidity, is widely used for hydraulic cylinder supports or rotating support bases.
In short, understanding the code of joint bearings is like mastering a set of "structural language". It not only tells you what the bearing looks like, but also implies where it can be used and how to use it most reliably. Next time when selecting, it may be better to start with the code to make the design more precise and efficient.
