The gear selection of dongzheng 24v dc motors should pay attention to mechanical properties. Gear is a mechanical transmission component that must be used in the reducer. Through the meshing of gear teeth, movement and power are transmitted between any two axes in space, and the form and speed of movement can be changed. Gear transmission has wide application range, constant transmission ratio, high efficiency and long service life. In the design and manufacturing process of mechanical parts, it is not only necessary to consider the performance of the material to adapt to the working conditions of the part and make it durable, but also the need for better processing performance and the economy of the material to improve the productivity of the part, reduce costs, and reduce consumption. If the gear material is not selected properly, the parts will be prematurely damaged or even fail. Therefore, how to choose and use metal materials reasonably is a very important work.

Meet the mechanical properties of the gear, including strength, hardness, plasticity and toughness, reflecting the characteristics of the material in use. When the gear meshes, there is contact stress in the contact part of the tooth surface, and there is a large bending stress in the root part of the tooth, which may cause the strength failure of the tooth surface or tooth body. Each point on the tooth surface slides relative to each other, causing wear. The main failure modes of gear include pitting, gluing, plastic deformation and fracture of tooth surface. Therefore, the gear material is required to have a high bending fatigue strength and contact fatigue strength, the tooth surface should have sufficient hardness and wear resistance, and the iron core should have a certain strength and toughness. When determining the hardness of the size gear, pay attention to the tooth surface hardness of the pinion is 30-50HBS higher than that of the big gear, because the pinion is loaded more than the big gear, the root of the pinion is thinner and the strength is lower than that of the big gear. In order to make the teeth of the two gears close to equal strength, the tooth surface of the small gear is harder than that of the big gear.

According to the performance of the material, determine the grade of the material. The mechanical properties or hardness of the material need to be defined, and then we can achieve the required hardness range through different heat treatment processes, thus giving the material different mechanical properties. The process performance of the material refers to the ability of the material to adapt to various processing requirements. Gears are manufactured by forging, cutting and heat treatment, so pay attention to the process properties of materials when selecting materials. Generally speaking, the forging and cutting properties of carbon steel are good, and its mechanical properties can meet the requirements of general working conditions.

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