Keyed kev twb kev txuas. Qhov kev sib txuas - GOST. Tolerances keyways tebchaw

Keyed kev twb kev txuas - ib yam ntawm cov ob saib docking gasketed qhov chaw. Nws yog ib qho tseem ceeb. Nyob rau hauv cov ntaub ntawv no, cov khoom kev cob cog rua nrog lub koom haum pab caij - qhov tseem ceeb.

kheej ntawm daim ntawv thov

tag nrho cov zoo nkauj yooj yim nyob rau hauv no hais txog. Ii keyed kev twb kev txuas rau Jointing ncej thiab hub. Namely, los mus tiv thaiv lawv los ntawm co-rotating thaum lub sij hawm torque kis tau tus mob. Tsis tas li ntawd, cov tebchaw siv, tab sis tsis yog lug, los mus tiv thaiv cov ua haujlwm ntawm lub dav hlau qhov chaw. Nyob rau hauv dab tsi li nram no peb xav tsuas yog thawj cov ntaub ntawv.

hom

Ntsiab kev twb kev txuas yog muab faib ua ob peb pab neeg: cov

1. Nyob ntawm cov neeg kawm ntawv ntawm cov kev mus ncig. Qhov no yog ib qho tseem ceeb cov yam ntxwv. Nyob rau hauv no hais txog, yog distinguished:

• Lub rooj noj kev twb kev txuas. Nyob rau hauv cov ntaub ntawv no, ib tug zawv zawg qhia los yog spigot.
• Tseem compound.

2. Nyob rau hauv lub thib ob pab pawg neeg yog ib tug dag zog yuam uas ua nyob rau hauv. Nws muaj ob hom:

• Ceeb. Nyob rau hauv no kev twb kev txuas dag zog yuam yog generated thaum lub sij hawm los ua ke. Nws tshwm sim nyias los ntawm lub workload.
• Unstressed. Nyob rau hauv no kev twb kev txuas dag zog yuam yog generated tsuas yog hais tias tus workload.

3. tebchaw yog sib cais los ntawm hom kev siv dowels. Namely:

• Prismatic.
• Ya.
• Cylindrical.
• Npoo.
• Tangential.

Ntxiv tuab txhua yam tseem ceeb nyias. Ua ntej, txawm li cas los, nws yuav tsum tau hais tias cov chaw no mas ua los ntawm high-quality, check Steel Medium: 45, 50, 55. Qhov no yog ib tug yeej muaj tseeb tseeb. Nyob rau hauv thiaj li yuav nce lub dag lub zog ntawm cov dowels, tuav rau lawv siv thiab muaj feem ntau raug rau thermal kho mob. Nws pab txoj kev lawv zoo.

Parallel tseem ceeb

Qhov no yog ib feem yog ib yam uas peb hom. Qhov ntawd yog muab faib mus rau hauv cov, qiv nyiaj yuav tsev thiab mus. Vim lub fact tias cov uas tig mus keyways nyuaj los hloov txhua lwm yam vim ib tug neeg adaptation, lawv tsis siv nyob rau hauv loj-scale lawm. Qhov no yog lawv qhov tseem ceeb drawback. Lwm disadvantage nyob rau hauv cov ntaub ntawv no yog cov muaj peev xwm mus dov tshaj thaum lub sij hawm coj.

Woodruff tseem ceeb

Qhov no hom tsis muaj xws li tsis zoo raws li cov thawj. Yog li ntawd lawv yog ib qho yooj yim mus thov nyob rau hauv ntau lawm. Tab sis lawv muaj lub disadvantage hais tias lawv ua tau lug siv - nws yog ib tug great ntoo khaub lig-seem ntawm tus ncej. Nws tsis yog ua tau rau nruab rau lawv nyob rau hauv lub bent feem ntawm tus ncej loaded.

cylindrical tseem ceeb

Qhov no yog yam tseem ceeb heev hom. Lawv yog siv mas rau hauv lub xaus ntawm tus ncej. Lawv siv yuav tsum tau hais tias lub neej coj ntaub ntawv yog txawv nyob rau hauv ceev thiab hardness. Qhov no tiv thaiv dav siv ntawm no hom ntawm lub lag luam nyob rau hauv loj-scale lawm.

tangential tseem ceeb

Qhov no yog ib feem muaj ob qhov chaw. Qhov no zoo ntawm prismatic npoo uas muaj ib lub ntoo khaub lig-section. Tsim kom muaj tangential tseem ceeb officers nyob rau ntawm ib kaum sab xis ntawm 120-180 degrees. Qhov kom zoo dua ntawm cov qhov chaw yog hais tias lawv cov ntaub ntawv uas ua hauj lwm nyob rau hauv compression thiab kuj no muaj yog qhov zoo tshaj plaws hauv daim ntawv ntawm cov coj groove tiv thaiv cov coj concentration ntawm stresses. Lub downside ntawm xws li ib tug tseem ceeb, koj yuav xav txog nws ib tug complex ntaus ntawv. Thov cov qhov chaw nyob rau hauv hnyav machinery.

tseem ceeb npoo

Lawv taw tes kis siv frictional rog.

Pluses ntawm hais tias qhov chaw:

- keyed kev twb kev txuas nyob rau hauv cov ntaub ntawv no muaj peev xwm mas ib tug me me axial load.

- Muaj ib tug zoo txoj hauj lwm nyob rau hauv tus ntawm nce mus nce los loads.

- Nws yog tsis tsim nyog rau siv lwm yam uas yuav tuav tiv thaiv axial zog ntawm tus hubs.

Outs ntawm cov yuam sij yog raws li nram no:

- Lub complexity ntawm disassembly thaum lub sij hawm kho.

- Muaj zog offset los ntawm qhov chaw ntawm lub hub txheeb ze rau tus ncej axis. Qhov no yog ib tug tseem ceeb qhov tseeb.

- Nyob rau hauv lub xub ntiag ntawm luv luv ntev nws yog ua tau cov khoom siv ntau yam pauv loj skew thiab runout tsis cais ib feem uas yog tsau (pulley, iav).

Tolerances keyways tebchaw

Qhov no txhais yog nemaloznachimym. Los xyuas kom meej qhov zoo ntawm cov tshuaj tolerances keyways tebchaw. Nws yog ib qho tseem ceeb kom paub. Sij keyed GOST 2.308-79 "Unified system ntawm kev tsim ntaub ntawv. Nco ntsoov nyob rau hauv lub drawings ntaub ntawv ntawm qhov tolerances thiab qhov chaw ". Qhov no sau raws nkaus Ii lub documentary puag.

Lub suav tsis teem chaw tolerances kev xav txog cov nram qab no kev sib raug zoo: T (Pr) = 0.6 T (br); T (sim0) = 4.0 T (w).

Qhov twg cov designations muaj xws li:

- T (br) - kam keyed qhov dav b.

- C (chav) - hais tias parameter parallelism.

- T (SIM) - symmetry kam nqi ntawm txoj kab uas hla tus nqi.

Lub xam tsis ntawm cov ntaub ntawv los ze zog mus rau tus txheej txheem txhais lus. Coj rau qhov no yuav GOST 24643.

Cog keyways tebchaw

Cov neeg ntawm centering qhov chaw muab los xaiv qhov kev xaiv no. Nws yog ib qho tseem ceeb yuav tau xav txog. Tolerances txhais peb hom tebchaw los yog landings. Nws yog tswj hwm los ntawm cov qauv. Tom ntej no, saib txhua yam ntawm kev nthuav dav.

free compound

Qhov no yuav tsaws siv nyob rau hauv yooj yim tej yam kev mob nrog tib cov rooj sib txoos loads. Siv rau mobile sib txuas muab teeb luag hauj lwm ua hauj lwm.

qub kev twb kev txuas

Yus nws raws li ib tug cuam tshuam haum, tsis yuav tsum tau nquag squabbles. Zoo build txawv tej yam kev mob.

ceev junctions

Lawv txiav txim siab qhov yuav tshwm ntawm tau txais kwv yees li tib yam me interferences nyob rau hauv lub duas paub dowel Jointing nrog ob lub Cheebtsam (lawv slots). Lub rooj sib txoos yog siv nyob rau hauv ib tug me me muaj pes tsawg tus ntawm rov qab loads.

Kev txiav txim ntawm cov tebchaw

Raws li twb hais saum toj no, tus nplaig yeej tseem zoo ua los ntawm high-zoo thiab lub dag lub zog steels ntawm nruab nrab (55, 50, 45). Yuav kom nce lub dag lub zog ntawm ib sab dawb paug rau lawv feem ntau yog raug los ua cua sov kev kho mob, uas pab txoj kev lawv zoo.

Thaum tsim ib tug keyed kev twb kev txuas, uas pre-nqus mus, lub qhov siab thiab dav ntawm lub qhov siv standard GOST 2336-7, noj mus rau hauv tus account lub lub cheeb ntawm tus ncej. Nyob rau hauv cov ntaub ntawv no, muaj yog tsis muaj dab tsi nyuaj. Qhov ntev ntawm tus nplaig coj nyob rau hauv lub hub. Piv no nrog rau cov txheej txheem kev cai. Xaiv ntawm tej yam tseem ceeb tsis soj ntsuam los ntawm kev thov muab xam ib qho tseem ceeb qhov tseem ceeb kev twb kev txuas zog. Nyob rau hauv kev xam xyuas qhov no yog tsis muaj big deal. Piv txwv li, tus mob ntawm lub dag lub zog nyob rau hauv cov ntaub ntawv no yog cov nram qab no mis:

σsm = F1 / ACM ≤ [σsm].

Ntawm no, F1 - parameter circumferential quab yuam kom ib tug pulley (H). AFM yog lub shear cheeb tsam (mm²). Qhov no tus nqi yog txiav txim los ntawm lub hauv qab no mis: (0,94h-t1) lp.

Nyob rau hauv cov ntaub ntawv no, LP = l-nyob rau hauv qhov tseem ceeb yog cov ua hauj lwm ntev nrog sib npaug xaus. Qhov no parameter yog ntsuas nyob rau hauv millimeters. l - yog keyed ntev.

Qhov tseem ceeb nyob rau hauv, h, t1 yog standard ntau thiab tsawg pab nyob rau hauv raws li GOST 23360 - 78.

[Σsm] - qhov chaw kawm lub permissible voltage cev qhuav dej rau (N / mm²). Thaum siv hlau Kit [σsm] yog tau txais nyob rau hauv ib tug tej yam ntau yam 55 ... 95 N / mm².

Ua hauj lwm tseem ceeb ntev yog xam raws li nram no:

lp = 32 - 6 = 26 hli.

Kev txiav txim ntawm crushing cheeb tsam:

ACM = (0.94 · 6 - 3.5) · 26 = 55,64 mm².

Tus nqi ntawm F1 txais lub tau ntsuam. Nyob rau hauv cov ntaub ntawv no, F1 = 1200 H.

Raws li ib tug tshwm sim, muab xam rau ntawm lub nyob voltage yuav tsum:

σsm = 1200 / 55,64 = 21,56 N / mm².

Qhov no qhia tau hais tias cov mob ntawm lub dag lub zog:

σsm = 21,56> [σsm] (55 ... 95 N / mm²).

Zoo tseem ceeb kev twb kev txuas

Ntawm no yog pom raws li nram no:

• Tsim txhim khu kev qha thiab check.
• Lawv yog cov yooj yim mus sib sau ua ke thiab lauj.
• Tsis tshua muaj nqi.
• Lawv yog cov yooj yim los tsim.

shortcomings

Nyob rau hauv no hwm, paub cov nram qab no:

• Keyway tsis muaj zog txaus seem ntawm tus ncej thiab cov hub.
• Nyob rau hauv muaj ntau yam tebchaw muaj misalignment. Hais tias yog, tus kwv tij xaav ntawm lub hub ncej axis thiab ib nrab diametrical clearance.
• Lub ces kaum keyway high voltage theem.