- tooth shape of sprocket
The sprocket tooth profile must ensure that the chain can enter and exit meshing smoothly and freely, minimize the impact and contact stress of the chain links during meshing, and be easy to process.
The commonly used sprocket end face tooth profile is shown in Figure 1.It is composed of three arcs aa, ab, cd and a straight line bc, referred to as three arcs-straight line tooth profile.The tooth shape is processed with standard tools. It is not necessary to draw the end face tooth shape on the working drawing of the sprocket. It is only necessary to indicate "the tooth shape is manufactured according to 3RGB1244-85" on the drawing, but the shaft surface tooth shape of the sprocket should be drawn. See Figure 2, and its dimensions refer to the relevant design manual.The parameter calculation has been mentioned before, so I won't repeat it!
- sprocket structure
Figure 3 shows four commonly used sprocket structures.Small-diameter sprockets are generally made into an integral type (Fig. 4a), and medium-diameter sprockets are mostly made of spoke plates. For ease of handling, clamping and weight reduction, holes are made on the spoke plates (Fig. 3b). Large-diameter sprockets can be used. It is made into a combined type (Figure 3d), and the ring gear and wheel core can be made of different materials at this time!Such as C3, stainless steel and other materials.
- Sprocket material
The sprocket material should ensure that the gear teeth have sufficient strength and wear resistance, so the sprocket tooth surface is generally heat treated to make it reach a certain hardness.