Split type roller pin bearing with asymmetric structure for small aviation piston engine

Abstract

The invention discloses a split type roller pin bearing with an asymmetric structure for a small aviation piston engine, and belongs to the field of small aviation piston engines. The split type roller pin bearing comprises a retainer and roller pins; the retainer is of a split type annular structure and is formed by splicing two asymmetric semicircular rings, and a plurality of roller pin horizontal grooves are evenly distributed in the circumferential direction of the circumferential surfaces of the two semicircular rings at the same angle; and each roller pin horizontal groove is rectangular and is used for mounting the roller pins, and the clearance fit is ensured. According to the split type roller pin bearing with the asymmetric structure for the small aviation piston engine, the retainer is of a split structure and can be conveniently installed on a crankshaft with the integral crank throw of the small aviation piston engine, due to the fact that the integral crank throw is goodin strength and rigidity, the structural design and the machining process of the crankshaft can be simplified while the strength and the rigidity of the crankshaft are guaranteed, and the crankshaftis compact in structure and light in weight.

Description

technical field [0001] The invention belongs to the field of small aviation piston engines, and in particular relates to a split-type asymmetric structure needle roller bearing for small aviation piston engines. Background technique [0002] At present, the vast majority of small and medium drones use two-stroke piston engines, and their crankshafts and connecting rods are one of the most important parts. Its working conditions are harsh, and its size parameters not only affect the overall size and weight of the engine to a large extent, but also greatly affect the reliability and life of the engine. In order to solve the reliability problem of the crankshaft connecting rod, the crankshaft mostly adopts the integral crankshaft and the segmented crankshaft. The integral crankshaft has the characteristics of reliable operation, light weight, high rigidity, high strength, and less processing surface, but the bearing structure is the one that affects the engine. The key to perf...

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Problems solved by technology

[0005] The Chinese patent of notification number CN108661793A proposes that although the crankshaft is a two-stage butt joint type split combination structure, its crank unit is still an integral structure, and the integral needle roller bearing cannot be used, and only the cage split type roller bearing can be used. Needle bearing structure, but the patent does not describe the structural design of the needle bearing in detail; the Chinese patent with the notification number CN103410851B proposes a needle bearing without an inner ring, which is a monolithic structure and can only be divided into crankshafts. It is installed on the crankshaft with one-piece structure, and its structure is relatively complicated, and there are many parts for kinematic coordination, which is easy to reduce the overall reliability of the bearing

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