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# ねじ締結と摩擦係数 - Yamaha Motor Company

Threaded Fastening and Coef cient of Friction Shunichi Kometani . Threaded fastening is used mainly for fastening together mechanical parts. Compared to other types of jointing methods such as adhesion, welding, brazing and pressure insertion, threaded fastening has a unique characteristic that elastic energy is built up inside the joint members. Tension in the bolt and compression in the fastened parts are created as a product of action and reaction. These forces can make the joint less susceptible to fatigue and loosening when external load is applied or internal pressure is increased. Fastening bolts in the assembling process is nothing more than applying mechanical energy to the joint members.

やJIS（Japan Industrial Standard）で規定されたメー トルねじは、ねじ山の角度が60°、山頂が平らで谷に 一定のすき間を設け、おねじとめねじがねじ山の直 線部、すなわちフランクﬂank でよく噛み合う。おねじ の谷の丸みを大きくし、ねじ山の高さを低くすること

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### Transcription of ねじ締結と摩擦係数 - Yamaha Motor Company

1 Threaded Fastening and Coef cient of Friction Shunichi Kometani . Threaded fastening is used mainly for fastening together mechanical parts. Compared to other types of jointing methods such as adhesion, welding, brazing and pressure insertion, threaded fastening has a unique characteristic that elastic energy is built up inside the joint members. Tension in the bolt and compression in the fastened parts are created as a product of action and reaction. These forces can make the joint less susceptible to fatigue and loosening when external load is applied or internal pressure is increased. Fastening bolts in the assembling process is nothing more than applying mechanical energy to the joint members.

2 The energy stored at the start of the joint life has a major effect on how the joint will behave and how long it will last. For example, this might be likened to the psych-up an athlete gives himself before a major competition. In this report the importance of the friction in the bolted joint is described and a measuring instrument for friction is shown, along with test results.. threaded fastening .. 2004 .. 2004 4 2 . 2 .. 3 .. 3. 6 19. 18. 1).. 5 16 . 52 . 1997-2001 270 .. 26. 1 . 31 17. 2 3 7. 5 .. ABS.. EGR .. 2). 1997 . 1 . 121 70% .. 74%. 49%. 2 .. 27%.. 23%.. 5%. 4%. 5%. 2 .. Tribology .. coef cient of friction . Law of Amontons-Coulomb.

3 1 . 2 . F. 3 . 3 .. F W . F= W (1).. 1736-1806 . W.. F = W.. 100 . 1663-1705 3 .. 1 .. 4 d 2. lead d 2. angle d 2, pitch diameter . 4 . 1 . lead P.. P, pitch . d2 . 30 30 .. tan =P/ d2 .. 5 I S O. International Organization for Standardization . d ( ).. JIS. Japan Industrial Standard . d1.. D.. 60 .. D1 .. d3. d2 D2.. ank . d 1 =D 1 =d d 2 =D 2 =d d 3 =d . 5 .. Fs cos .. Ftan( + ) . 6 .. Fsin . F Fs .. tan = .. Fs sin . F s =Ftan( + ).. Fcos . F . 6 . 7 . Fs sin . Fs=Ftan( ). Ftan( - ) 0 .. > . Fs . = .. tan = =6 .. Fsin . 6 .. Fs cos . =tan-1(P/ d2) M6 6mm . 1mm Fcos .. M10 .. F .. 7 .. T 3 .. F d2 P. T= ( s dW W) (2). 2 cos.

4 T F Motosh . 3) 4) 5) F d2. Bickford . 2 cos S. s 30 d2 . F P.. 2 F. P dW W w . 2. dw . 2(dO3-dh3). dW= (3). 3(dO2-dh2). dO dh .. M8 15Nm . T=15Nm w . P=1mm F 54 %.. 37 % .. s 15Nm . 9%. kN.. 8 M8 . 9% 9 . 8 .. W .. S W .. 6) .. 9 .. 9 10 2003 .. s .. w . T f .. 32mm 4mm .. 10 .. Ts s . F s P. Ts= ( d2 ) (4). 2 cos . Tw Tf Ts . TW=Tf -Ts (5). w . F. TW= dW W (6). 2.. M6 2 90 . +6 .. NiZn .. M6 . 40 . 4 .. ADC12 . SPHC SPHC . n=5 .. M6 .. 20rpm 13Nm . 11 11 .. JIS B 1084 s w : . w s w 50-80 1 . M6 . s= . s 6kN . 0 2 4 6 8 10. 12 13 (kN). 12 . NiZn . F s w w : . s w s s 4kN . 6kN w .. 14 15 4 s w s w . 5 0 2 4 6 8.. (kN). w 13 NiZn.

5 SPHC . SPHC . w w .. SPHC . SPHC . s s 14 15 NiZn .. w 1 . s w . kN . NiZn w NiZn 7. s NiZn NiZn 7.. NiZn 12Nm . 10.. 5 s w . 8 NiZn 12Nm 1 . kN . 6. 16 . 4.. 2. NiZn .. 0.. 16 12Nm kN .. 6 6 . 2007 . 6 .. 1) .. 2) . , 1997 . 3) , 1970 4) , 2003 5) John H. Bickford: An Introduction to the Design and Behavior of Bolted Joints, Marcel Dekker, Inc. (1995). 6) , 1994.