safety factor; factor of safety 安全系数

scale 比例尺

scoring 胶合

screw 螺杆

screw efficiency 螺纹效率

screw mechanism 螺旋机构

screw nut 螺母

screws 螺钉

seal 密封

seal belt 密封带

seal gum 密封胶

sealing arrangement 密封装置

section 截面

self-aligning ball bearing 调心球轴承

self-aligning bearing 调心轴承

self-aligning roller bearing 调心滚子轴承

self-locking 自锁

series combined mechanism 串联式组合机构

serration spline 三角形花键

shaft 轴

shaft angle 轴角

shaft collar 轴环

shaft end ring 轴端挡圈

shaft shoulder 轴肩

shaking couple 振动力矩

shaper 牛头刨床

shockproof device 防振装置

shocks; shock-absorber 缓冲装置

silent chain 齿形链、无声链

simple harmonic motion 简谐运动

sine generator, scotch yoke 正弦机构

single row bearing 单列轴承

single universal joint 单万向联轴节

single-direction thrust bearing 单向推力轴承

singular position 奇异位置

six-bar linkage 六杆机构

slack-side 松边

sleeve 套筒

slider 滑块

slider-crank (or crank-slider) mechanism 曲柄滑块机构

sliding bearing 滑动轴承

sliding ratio 滑动率

slipping 打滑

solid lubricant 固体润滑剂

spacewidth 齿槽宽

spatial cam 空间凸轮机构

spatial kinematic chain 空间运动链

spatial kinematic pair 空间运动副

spatial linkage 空间连杆机构

spatial mechanism 空间机构

special kinematic chain 特殊运动链

specific heat capacity 比热容

speed change 变速

speed control system 调速系统

speed fluctuation 速度波动

speed governing 调速

speed reducer 减速器

speed-changing gear boxes 齿轮变速箱

sphere-pin pair 球销副

spheric pair 球面副

spherical involute 球面渐开线

spherical motion 球面运动

spindle 心轴

spiral bevel gear 曲齿锥齿轮

spiral seal 螺旋密封

spline 花键

spontaneous ignition 燃点

sprocket ; sprocket-wheel ; sprocket gear ; 链轮

spur gear 直齿圆柱齿轮

square threaded form 矩形螺纹

square-jaw positive-contact clutch 矩形牙嵌式离合器

stack mounting 组合安装

standard gear 标准齿轮

standard spur gear 标准直齿轮

starting period 起动阶段

starting torque 启动力矩

static balance 静平衡

static equivalent axial load 轴向当量静载荷

static equivalent radial load 径向当量静载荷

static force 静力

static load 静载荷

static seal 静密封

steady motion period 稳定运转阶段

step pulley 塔轮

stepless speed changes devices 无级变速装置

stiffness coefficient 刚度系数

stopping phase 停车阶段

straight bevel gear 直齿锥齿轮

straight shaft 直轴

straight sided normal worm 法向直廓蜗杆

stress amplitude 应力幅

stress concentration 应力集中

stress diagram 应力图

stress-strain diagram 应力—应变图

structural design 结构设计

structure 结构

studs 双头螺柱

sub-mechanism 子机构

subroutine 子程序

sun gear 太阳轮

sunk key 嵌入键

superficial mass factor 表面质量系数

surface coefficient of heat transfer 表面传热系数

surface roughness 表面粗糙度

swiveling speed ; rotating speed 转速

symmetry circulating stress 对称循环应力

synchronous belt 同步带

synchronous belt drive 同步带传动