Pins(销)

 Functions of pins(销的用途)

Pins are used to join or position two parts (Fig. 7-34). Pins usually only transfer small torques when joining two parts. 

销主要用于两零件之间的联接或定位(图7-34)。联接时,一般只能传递不大的转矩。

Types of pins(销的种类)

Commonly used pins are parallel pins, taper pins and splitcotter pins. According to different precision fittings of pins and pinholes,parallel pins are divided into two categories, i.e.,A(general quench)and B (surface quench). There are two types of taper pins, i.e. ,A and B. See appendix table 2-15 to 2-17 for pinstructures and dimensions. 

常用的销有圆柱销、圆锥销和开口销。根据销与销孔配合精度不同,圆柱销分为A型(普通淬火)、B型(表面淬火)。圆锥销也有A型和B型之分。销的结构型式及其尺寸系列见附录表2-15~2-17。

 Marksof pins(销的标记)

Pins are fastening components. Pins, like thread fasteners, are marked in the same way. Their name, number, type and dimension information should be reflected. See table 7-6 for marks and marking methods. 

销也属紧固件,其标记方法与螺纹紧固件相同, 内容包括名称、标准编号、型式与尺寸等。销的标记型式和标记方法见表7-6。

Drawing methods of a pin assembly(销的装配图画法)

A pin assembly drawing is shown in Fig. 7-34. If the cut crosses the pin's axis, the pin, being a solidpiece, will be drawn in accordance with the profile without sectioning. If the cutting plane is perpendicular to the axis, the section hatching should be added.

销的装配图画法如图7-34所示。销作为实心件,当剖切平面通过销的轴线时,仍按外形画出;垂直于销的轴线剖切时,应画上剖面符号。

Matching requirements for parallel and the taperpins are precise. Usually, the pinhole is machined once the joint has been assembled. See the machining methods in Fig. 7-35. 

圆柱销和圆锥销的装配要求较高,销孔一般在被联接件装配后统一加工,其加工方法如图7-35所示。