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±â¾î¹Ú½º¿¡´Â µ¿·ÂÀ» Àü´ÞÇÏ´Â Ãà(shaft)°ú ±â¾î(gear teeth) ±×¸®°í ±× ÃàÀ» Àâ°í ÀÖ´Â º£¾î¸µ(bearing)À¸·Î ±¸¼ºµÈ´Ù. ±â¾î´Â ¼·Î ¦À» ÀÌ·ç¾î¾ß µ¿·ÂÀ» Àü´ÞÇÏ°í Çü½Ä¿¡ µû¶ó¼ Àü´Þ¹æÇâÀ» Á¶Á¤ÇÒ ¼öµµ ÀÖÀ¸³ª Áøµ¿(vibration)ÀÌ ¹ß»ýÇÏÁö ¾Êµµ·Ï ±â¾î¸¦ ¼³°èÇÒ ¼ö´Â ¾ø´Ù. ±â¾î´Â ¾î´À Á¤µµ ¿©À¯(backlash)¸¦ °¡Áö°í ¿òÁ÷¿©¾ß ÇÏ¸ç µû¶ó¼ Ä¡¿Í Ä¡°¡ ´ê°í ¶³¾îÁö¸é¼ ÀÚ¿¬½º·´°Ô Áøµ¿ÀÌ ¹ß»ýÇÑ´Ù. ¶ÇÇÑ º£¾î¸µ°úÀÇ ¹®Á¦µµ ¾ÆÁÖ ¹ÐÁ¢ÇÏ¿© º£¾î¸µÀÌ ¼Õ»óÀ» ÀÔÀ» °æ¿ì ±â¾îÀÇ ¼ö¸í¿¡µµ Å« ¿µÇâÀ» ÁØ´Ù. ±â¾î¹Ú½º¸¦ »ç¿ëÇÏ´Â ÀÌÀ¯´Â ¿ì¼± ½½¸³ÀÌ ¾øÀÌ Á¤È®ÇÏ°í °·ÂÇÑ µ¿·ÂÀ» Àü´ÞÇÏ°í °í¼Ó¿¡¼µµ °¡µ¿ÇÒ ¼ö ÀÖ´Â Á¡À̶ó°í ÇÒ ¼ö ÀÖÀ¸³ª ¹Ý¸é¿¡ À±È°°ú °íµµÀÇ ÃàÁ¤·ÄÀÌ ÇÊ¿äÇÏ°í ¼ÒÀ½°ú Áøµ¿ÀÌ ¹ß»ýÇÑ´Ù´Â Á¡µµ ÀÖ´Ù.
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±â¾î´Â ÀÌ»¡ÀÌ ¹Ð¾î³»´Â °¢µµÀÎ ¡®tangent¡¯ÀÇ °¢µµ·Î µ¿·ÂÀÇ º¤ÅÍ°¡ ÇâÇϸç Á÷Á¢ ´ê¾Æ¼ ¿òÁ÷ÀÌ´Â ±ËÀûÀº ±â¾îÀÌ»¡ÀÇ Áß°£Á¤µµ ºÎºÐÀÎ ¡®pitch circle¡¯·Î ¼³¸íµÈ´Ù. ´ÙÀ½Àº ±â¾î¿Í °ü·ÃµÈ ÁÖ¿ä ¿ë¾î¸¦ Á¤¸®ÇÏ¿´´Ù.
1. Pitch circle diameter(Pc)-ÇÇÄ¡½áŬÀÇ Áö¸§
2. Diamentral Pitch(Pd)-ÇÇÄ¡½áŬ Áö¸§¿¡¼ ±â¾îÀÇ ÀÕ¼ö¸¦ ³ª´« °ª
3. Circular pitch(Cp)-ÇÇÄ¡½áŬÀÇ circumferenceÀ§¿¡ ÀÖ´Â Ä¡(teeth)µé °£ÀÇ °Å¸®.
4. Normal Pitch(Np)-Àιú·çÆ® ÀÌ»¡ Ç¥¸éÀÇ°ú źÁ¨Æ®°¢ÀÇ Á¤»óÀûÀÎ °Å¸® distance along the normal to the common tangent between successive involute tooth surfaces(Np=Cp*cos(A))
5. Base circle diameter(Bd)-Àιú·çƮĿºê°¡ ±×·ÁÁö´Â ¼Å¬ÀÇ Áö¸§
6. Gear ratio-(Ng)-°¢±â¾îÀÇ ÀÕ¼ö°£ÀÇ ºñÀ²
7. Base Helix angel-¶óÀΰú ¼öÆò»óÅ¿¡¼ ȸÀüÃà°úÀÇ ¶óÀÎ ±â¿ï±â
8. Lead-360µµ¸¦ µû¶ó ȸÀüÇÏ´Â ±â¾î¸¦ À§ÇÑ Ç︮Äñâ¾î¿¡¼ Ãà¹æÇâÀÇ ¿îÇà°Å¸®.
9. Line of action-´Ù¸¥ ±â¾î¿Í Á¢ÃËÇÒ ¶§ źÁ¨Æ®°¢ÀÇ Á¤»óÀûÀÎ °Å¸® distance along the normal to the common tangent during which one tooth is contact with one tooth on the other gear
10. Backlash-µÎ±â¾î°¡ Á¢ÃËÇÒ ¶§ ¸¶ÁÖÇÏ´Â µÎ ±â¾î°£ÀÇ Å¬¸®¾î·±½º
11. Working depth-Á¢Ã˵Ǵ ÀÌÀÇ ³¡°ú Á¢Ã˵Ǵ ºÎºÐÀÇ ¹Ý°æ°Å¸®
12. Contact ratio-average number of pairs of teeth that are theoretically in contact; this is approximately equal to the length of the line of action divided by the normal pitch.
13. Addendum-ÇÇÄ¡½áŬ¹Ý°æ°ú ¿Ü°æ¹Ý°æÀÇ Â÷ÀÌ
14. Dedendum-ÇÇÄ¡½áŬ¹Ý°æ°ú ·çÆ®½áŬ¹Ý°æÀÇ Â÷ÀÌ
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