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Based on the geometrical relation between tappets and cams,uniform formulas for mutual lift-range transition between flat based tappet,roller(or sphere)tappet and cone tappet were presented.

通过分析不同从动件与凸轮的几何关系,推导出一组平底挺杆、滚子或球面挺杆、尖锥挺杆升程的相互转换通用公式。

Fracture Analysis of 20CrMoA Sucker Rod Head’s Square Spanner in Straightening Process

20CrMoA抽油杆杆头板手方部校直断裂原因分析

A beam that connects the piston rod to the connecting rod of a reciprocating engine.

十字头连接活塞杆和往复式发动机连杆的横杆

Hexagon bolts with split pin hole on shank--Reduced shank--Product grade B

GB/T31.2-1988六角头螺杆带孔螺栓细杆B级

He knocked his head against a wire post.

他的头碰在电线杆上。

single-enveloping worm gear

圆柱[单头]蜗杆传动

hard banding of tool joint

钻杆接头表面加硬圈

A five iron used in golf.

高尔夫球5号铁头球杆

hard facing of tool joint

钻杆接头表面加硬层

steering knuckle tie rod end pressure lubricator

转向节横拉杆接头油嘴

mule-head hanger

驴头上挂抽油杆的装置

driving lever for crosshead lubricating pump

十字头润滑油泵传动杆

shoulder dressing tool

钻杆接头端面整形工具

double-purpose interchangeable tip square blade screwdriver

可换头方杆两用螺丝刀

Botox: Taking Pains to Relieve Headaches

肉毒杆菌??偏头痛克星

double pin sucker rod

两头阳螺纹的抽油杆

a long staff with one end being hook shaped.

一头被做成钩形的长杆。

sharp spikes on top of the railings in the park

公园栏杆上的尖头.

Defects Analysis on 37CrMnMo4 Drill Pipe Joints

37CrMnMo4钻杆接头缺陷分析