safety factor; factor of safety 安全系數

scale 比例尺

scoring 膠合

screw 螺杆

screw efficiency 螺紋效率

screw mechanism 螺旋机构

screw nut 螺母

screws 螺釘

seal 密封

seal belt 密封帶

seal gum 密封膠

sealing arrangement 密封裝置

section 截面

self-aligning ball bearing 調心球軸承

self-aligning bearing 調心軸承

self-aligning roller bearing 調心滾子軸承

self-locking 自鎖

series combined mechanism 串聯式組合机构

serration spline 三角形花鍵

shaft 軸

shaft angle 軸角

shaft collar 軸環

shaft end ring 軸端擋圈

shaft shoulder 軸肩

shaking couple 振動力矩

shaper 牛頭刨床

shockproof device 防振裝置

shocks; shock-absorber 緩衝裝置

silent chain 齒形鏈﹛無聲鏈

simple harmonic motion 簡諧運動

sine generator, scotch yoke 正弦机构

single row bearing 單列軸承

single universal joint 單万向聯軸節

single-direction thrust bearing 單向推力軸承

singular position 奇异位置

six-bar linkage 六杆机构

slack-side 松邊

sleeve 套筒

slider 滑塊

slider-crank (or crank-slider) mechanism 曲柄滑塊机构

sliding bearing 滑動軸承

sliding ratio 滑動率

slipping 打滑

solid lubricant 固体潤滑劑

spacewidth 齒槽寬

spatial cam 空間凸輪机构

spatial kinematic chain 空間運動鏈

spatial kinematic pair 空間運動副

spatial linkage 空間連杆机构

spatial mechanism 空間机构

special kinematic chain 特殊運動鏈

specific heat capacity 比熱容

speed change 變速

speed control system 調速系統

speed fluctuation 速度波動

speed governing 調速

speed reducer 減速器

speed-changing gear boxes 齒輪變速箱

sphere-pin pair 球銷副

spheric pair 球面副

spherical involute 球面漸開線

spherical motion 球面運動

spindle 心軸

spiral bevel gear 曲齒錐齒輪

spiral seal 螺旋密封

spline 花鍵

spontaneous ignition 燃點

sprocket ; sprocket-wheel ; sprocket gear ; 鏈輪

spur gear 直齒圓柱齒輪

square threaded form 矩形螺紋

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

stack mounting 組合安裝

standard gear 標准齒輪

standard spur gear 標准直齒輪

starting period 起動階段

starting torque 啟動力矩

static balance 靜平衡

static equivalent axial load 軸向當量靜載荷

static equivalent radial load 徑向當量靜載荷

static force 靜力

static load 靜載荷

static seal 靜密封

steady motion period 穩定運轉階段

step pulley 塔輪

stepless speed changes devices 無級變速裝置

stiffness coefficient 剛度系數

stopping phase 停車階段

straight bevel gear 直齒錐齒輪

straight shaft 直軸

straight sided normal worm 法向直廓蝸杆

stress amplitude 應力幅

stress concentration 應力集中

stress diagram 應力圖

stress-strain diagram 應力﹛應變圖

structural design 結构設計

structure 結构

studs 雙頭螺柱

sub-mechanism 子机构

subroutine 子程序

sun gear 太陽輪

sunk key 嵌入鍵

superficial mass factor 表面質量系數

surface coefficient of heat transfer 表面傳熱系數

surface roughness 表面粗糙度

swiveling speed ; rotating speed 轉速

symmetry circulating stress 對稱循環應力

synchronous belt 同步帶

synchronous belt drive 同步帶傳動