The new spline shaft gear limits the belt transmission transverse shaft gearbox spline shaft gear single-shoulder bidirectional positioning space in the gear occupied space to solve the problem that the gear single-shoulder bidirectional positioning is hard to implement due to the small utilization space caused by the compact gearbox, which is simple in structure and also practical. Two rectangular openings convenient for assembling or disassembling the clamping spring are symmetrically processed in the radial direction of a clamping spring groove. The enterprise with certain cold extrusion processing production scale can utilize the invention only by improving the technique and mold. Therefore, the invention has good popularization and application value and market prospect; the technical method of processing the spline shaft by medium carbon steel cold extrusion belongs to the technical field of mechanical processing.

The technique comprises the following steps: firstly cutting blanks, quenching and tempering the cut blanks, finishing the blanks, executing integral composite extrusion after surface phosphating and saponification treatment, and then cutting. The invention has scientific and advanced technique, improves production efficiency, reduces material consumption, improves product quality, and lowers the product cost. A belt transmission transverse shaft gearbox spline shaft gear single-shoulder bidirectional positioning device includes a gearbox spline shaft and a gear mounted on the spline shaft; a shaft shoulder which is larger than the outer diameter of the spline shaft is processed on the spline shaft; an inner spline matched with the spline shaft is installed at one end of the gear while a shaft hole which is larger than the outer diameter of the shaft shoulder is processed at the other end; a clamping spring groove is arranged on the inner wall close to the end of the shaft hole; a clamping spring is installed in the clamping spring groove; a shaft sleeve is mounted on the spline shaft between the shaft shoulder and the clamping spring; and two rectangular openings are symmetrically processed in the radial direction of the clamping spring groove.

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