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بسم الله الرحمن الرحيم السلام عليكم ورحمة الله |
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2 |
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00:00:07,630 --> 00:00:10,930 |
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وبركاته اليوم هنكمل المحاضرة الخامسة في chapter ال |
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3 |
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00:00:10,930 --> 00:00:14,530 |
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gears المرة الفاتحة هنا عن حساب ال minimum number |
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4 |
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00:00:14,530 --> 00:00:17,010 |
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of teeth to avoid interference between two mating |
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5 |
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00:00:17,010 --> 00:00:22,390 |
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gears opinion and gear المرة هتحدث ال minimum |
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6 |
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00:00:22,390 --> 00:00:25,130 |
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number of teeth on .. in order to avoid |
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7 |
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00:00:25,130 --> 00:00:29,810 |
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interference between opinion and rack اللي هو ال |
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8 |
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00:00:29,810 --> 00:00:36,170 |
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rack ترسدلهفي الحالة هذه المعادلة تُعطى الـ NP |
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9 |
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00:00:36,170 --> 00:00:40,870 |
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بسوء اتنين K على صين سكوير فيه الـ minimum number |
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10 |
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00:00:40,870 --> 00:00:45,770 |
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of teeth on a pinion for involute rack to avoid |
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11 |
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00:00:45,770 --> 00:00:48,690 |
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interference مُعطُو الإعلاق NP بسوء اتنين K في |
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12 |
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00:00:48,690 --> 00:00:57,890 |
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الصين على صين سكوير فيه خلّينا نحل example opinion |
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13 |
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00:00:57,890 --> 00:01:05,460 |
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of a twenty involute teethand a pinion عدس nano T |
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14 |
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00:01:05,460 --> 00:01:13,180 |
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تاعت ال pinion عشرين سن and |
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15 |
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00:01:13,180 --> 00:01:21,000 |
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و ال pitch circle بتاعته قطرها اللي هي D مية و |
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16 |
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00:01:21,000 --> 00:01:27,900 |
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خمسة و عشرين ميلي متر it |
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17 |
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00:01:27,900 --> 00:01:32,590 |
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drives a rackthe addendum of both pen and rag is 6 |
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18 |
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00:01:32,590 --> 00:01:38,930 |
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.25 مليمتر |
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19 |
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00:01:38,930 --> 00:01:42,910 |
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what is |
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20 |
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00:01:42,910 --> 00:01:45,910 |
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the least pressure angle which can be used to |
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21 |
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00:01:45,910 --> 00:01:50,750 |
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avoid interference ايش اقل زاوية لل pressure angle |
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22 |
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00:01:50,750 --> 00:01:53,170 |
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عشان اتجنب surrender interference احنا نرجع |
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23 |
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00:01:53,170 --> 00:01:57,850 |
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للمعادلة and penion بسوا |
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24 |
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00:01:57,850 --> 00:01:58,610 |
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اتنين K |
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25 |
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00:02:04,180 --> 00:02:15,100 |
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على sin²phi معناته sin²phi هتكون ساوية اتنين K على |
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26 |
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00:02:15,100 --> 00:02:21,140 |
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NP يعني هتكون اتنين في واحد على عدد ال .. ال .. ال |
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27 |
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00:02:21,140 --> 00:02:26,780 |
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.. ال اثنان ال pinion اللي هو عشرينيعني واحد على |
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28 |
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00:02:26,780 --> 00:02:32,280 |
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عشرة ومنها بحسب ال sign في ومنها بحسب ال في يعني |
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29 |
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00:02:32,280 --> 00:02:39,300 |
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ال في هتكون |
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30 |
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00:02:39,300 --> 00:02:43,420 |
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square |
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31 |
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root ل point واحد بطلع |
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32 |
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00:02:49,460 --> 00:02:58,450 |
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اللي هو sign squareسن الفاى بالسوابون تلاتة واحد |
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33 |
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00:02:58,450 --> 00:03:05,550 |
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ستة اتنين هنحسب |
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34 |
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00:03:05,550 --> 00:03:17,690 |
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سين انفرس لبون تلاتة واحد ستة اتنينتطلع تقريبا 18 |
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35 |
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00:03:17,690 --> 00:03:20,950 |
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.433 تقريبا 18.433 تقريبا 18.433 تقريبا 18.433 |
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36 |
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00:03:20,950 --> 00:03:22,830 |
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تقريبا 18.433 تقريبا 18.433 تقريبا 18.433 تقريبا |
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37 |
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00:03:22,830 --> 00:03:29,430 |
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18.433 تقريبا 18.433 تقريبا 18.433 تقريبا 18.433 |
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38 |
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00:03:29,430 --> 00:03:29,850 |
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تقريبا 18.433 تقريبا 18.433 تقريبا 18.433 تقريبا |
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39 |
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00:03:29,850 --> 00:03:32,750 |
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تقريبا 18.433 تقريبا 18.433 تقريبا 18.433 تقريبا |
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40 |
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00:03:32,750 --> 00:03:39,770 |
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18.433 تقريبا 18 |
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41 |
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00:03:39,770 --> 00:03:47,300 |
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.433 تقريبا 18.433 تقريبfind the length of the arc |
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42 |
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00:03:47,300 --> 00:03:54,740 |
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of contact and |
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43 |
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00:03:54,740 --> 00:04:00,500 |
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the |
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44 |
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00:04:00,500 --> 00:04:03,720 |
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minimum number of teeth in contact at a time |
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45 |
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00:04:03,720 --> 00:04:06,960 |
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contact ratio يعني |
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46 |
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00:04:13,630 --> 00:04:17,070 |
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ال .. ال .. ال .. لو نرجع على الشكل اللي عندي هنا |
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47 |
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00:04:17,070 --> 00:04:24,870 |
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الشكل |
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48 |
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00:04:24,870 --> 00:04:30,610 |
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اللي انا هكون عندي هنا ال .. ال .. ال .. هاي ال |
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49 |
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00:04:30,610 --> 00:04:33,470 |
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pitch circle بتاع ال .. ال pinion |
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50 |
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00:04:37,340 --> 00:04:41,600 |
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ال length of path of contact اللي هو هيكون k في l |
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51 |
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00:04:41,600 --> 00:04:46,820 |
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ال length of path of contact اللي هو k في l k في l |
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52 |
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00:04:46,820 --> 00:04:50,120 |
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k |
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53 |
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00:04:50,120 --> 00:04:55,760 |
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في l هيكون عند ال ال |
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54 |
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00:04:55,760 --> 00:05:00,420 |
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length of path of contact ال length path of |
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55 |
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00:05:00,420 --> 00:05:11,080 |
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contact بيستوى kKL طلع المثلث المثلث OLK المثلث |
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56 |
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00:05:11,080 --> 00:05:15,760 |
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OLK |
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57 |
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00:05:15,760 --> 00:05:21,740 |
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ال KL هيكون |
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58 |
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00:05:21,740 --> 00:05:31,580 |
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الجزر التربيعي لل OK تربيع هيكون الجزر التربيعي لل |
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59 |
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00:05:31,580 --> 00:05:43,140 |
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OKتربية minus OL تربية ال |
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60 |
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00:05:43,140 --> 00:05:47,920 |
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OK ال |
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61 |
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00:05:47,920 --> 00:05:51,620 |
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OK هو |
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62 |
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00:05:51,620 --> 00:06:00,000 |
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ال R بتاعة ال addendum تربية وال OL |
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63 |
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00:06:04,400 --> 00:06:09,060 |
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الـ OL اللى |
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64 |
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00:06:09,060 --> 00:06:14,380 |
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هو ال base circle اللى هو R cos |
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65 |
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00:06:14,380 --> 00:06:18,580 |
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فى |
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66 |
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00:06:18,580 --> 00:06:25,100 |
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ال |
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67 |
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00:06:25,100 --> 00:06:35,570 |
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R اللى 125 على 2 اللى 62.5 ملي مترو ال R A هتكون |
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68 |
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00:06:35,570 --> 00:06:40,930 |
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ال R زاد ال A ليه اتنين و ستين و نص زاد ستة و ربع |
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69 |
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00:06:40,930 --> 00:06:45,890 |
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يعني هكون اتنين و ستين و نص زاد ستة و ربع اتنين و |
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70 |
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00:06:45,890 --> 00:06:51,070 |
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ستين و ستة تمانية و ستين point سبعة خمسة |
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71 |
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00:06:51,070 --> 00:06:58,610 |
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millimeter يعني هيكون عندي هنا جزر التربية لتمانية |
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72 |
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00:06:58,610 --> 00:07:06,070 |
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و ستين point سبعة خمسةتربيه ماينوس اتنين تربيه |
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73 |
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00:07:06,070 --> 00:07:14,390 |
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ماينوس اتنين وستين و نص تربيه cosine تربيه الفايل |
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74 |
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00:07:14,390 --> 00:07:17,810 |
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هي تمانتاش point أربعة تلاتة |
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75 |
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00:07:42,960 --> 00:07:47,920 |
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بطلع تنين و تلاتين point |
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76 |
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00:07:47,920 --> 00:07:54,980 |
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سبعة تمانية millimeter ال |
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77 |
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00:07:54,980 --> 00:08:00,480 |
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length of arc of contact هو length of path of |
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78 |
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00:08:00,480 --> 00:08:05,260 |
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contact على cosine الفي يعني اتنين و تلاتين point |
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79 |
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00:08:05,260 --> 00:08:11,530 |
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سبعة تمانية على cosineتمنتاش point اربعة تلاتة |
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80 |
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00:08:11,530 --> 00:08:19,510 |
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يعني هتكون بيطلع |
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81 |
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00:08:19,510 --> 00:08:25,310 |
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اربعة تلاتين point خمسة خمسة millimeter هذا ال |
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82 |
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00:08:25,310 --> 00:08:32,950 |
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length of arc of contact ال contact ratio بالساوية |
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83 |
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00:08:34,740 --> 00:08:38,540 |
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ال length of arc of contact على ال pc يعني بيساوي |
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84 |
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00:08:38,540 --> 00:08:42,020 |
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ال length of arc of contact على باي في الموديول |
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85 |
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00:08:42,020 --> 00:08:49,960 |
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عندي |
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86 |
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00:08:49,960 --> 00:08:52,700 |
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اللي هو ال ال ال ال ال ال ال ال ال ال ال ال ال ال |
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87 |
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00:08:52,700 --> 00:08:54,280 |
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ال ال ال ال ال ال ال ال ال ال ال ال ال ال ال ال ال |
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88 |
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00:08:54,280 --> 00:08:55,660 |
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ال ال ال ال ال ال ال ال ال ال ال ال ال ال ال ال ال |
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89 |
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00:08:55,660 --> 00:08:55,720 |
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ال ال ال ال ال ال ال ال ال ال ال ال ال ال ال ال ال |
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90 |
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00:08:55,720 --> 00:08:56,020 |
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ال ال ال ال ال ال ال ال ال ال ال ال ال ال ال ال ال |
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91 |
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00:08:56,020 --> 00:08:56,300 |
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ال ال ال ال ال ال ال ال ال ال ال ال ال ال ال ال ال |
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92 |
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00:09:02,950 --> 00:09:09,130 |
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على عدد الأسنان اللي على عشرين مية و خمسة و عشرين |
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93 |
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00:09:09,130 --> 00:09:18,110 |
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تقسم عشرين بيطلع ستة و ربع معناه |
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94 |
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00:09:18,110 --> 00:09:21,310 |
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تكون ال connect ratio هتكون سوى اربعة و تلاتين |
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95 |
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00:09:21,310 --> 00:09:25,290 |
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point خمسة خمسة ع تلاتة point واحد اربع اللي هي |
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96 |
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00:09:25,290 --> 00:09:27,370 |
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باي في ستة و ربع |
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97 |
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00:09:39,840 --> 00:09:52,300 |
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تطلع واحد point سبعة ستة هيك |
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98 |
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00:09:52,300 --> 00:09:53,840 |
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يكون خلصنا ال chapter |
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