Axial positioning structure

Abstract

The invention discloses an axial positioning structure which comprises a shaft and a part to be positioned. The part to be positioned is mounted on the shaft. The shaft comprises a hexagon and a shaft shoulder for positioning. A tool withdrawal groove is reserved at the connection of the hexagon with the shaft shoulder. A hexagon hole matching with the hexagon is reserved on the part to be positioned. A round concave platform is disposed on one side of a positioning end face, attaching to the shaft shoulder, of the part to be positioned. The depth of concave platform is larger than the length between no back chipping of machined hexagon on the shaft shoulder and the shaft shoulder. The axial positioning structure is simple in structure and convenient to machine. When the difference between the full-size envelope circle diameter of a hexagon section of a part on a connecting shaft and the size of the shaft shoulder is quite low, reliable axial positioning of the part on the shaft can be guaranteed, and weakening of torque transmission of the shaft is low.

Description

【Technical Field】 [0001] The present invention relates to the field of transmission technology, in particular to an axial positioning structure of parts on a shaft of a transmission system. 【Background technique】 [0002] See Figure 2a to Figure 2f As shown, parts mounted on the six sides of the shaft are often axially positioned using the shoulders adjacent to the six sides. Using the conventional axial positioning method, in order to prevent the unclear roots of the processed hexagon from blocking the end face of the part mounted on the hexagon from being close to the positioning end face of the shaft shoulder, it is usually necessary to machine a recess on the positioned part mounted on the hexagon. The diameter of the recess is slightly larger than the maximum outer diameter of the fillet for stress concentration relief at the root of the hexagonal outer cylindrical surface of the shaft. In order to ensure sufficient positioning contact area, the diameter of the positioning ...

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Problems solved by technology

[0003] The purpose of the present invention is to provide an axial positioning structure, when the diameter of the hexagonal outer enveloping circle of the shaft is very close to or equal to the diameter of the shaft shoulder, under the condition of neither increasing the diameter of the shaft shoulder nor reducing the size of the hexagon, the Use the shaft shoulder to realize the axial positioning of the parts installed on the hexagonal part of the shaft, realize the transmission of the required torque with the smallest diameter shaft, and solve the problem that due to structural or space constraints, the large shaft diameter cannot be used to achieve the large torque required for transmission. The problem

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