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Front Wheel Drive

Front Wheel Drive. Coupling. الاسم فصل رقم بولا عماد كامل 2 27 عماد ابراهيم انيس 4 3 مايكل جورج توفيق 4 13

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Front Wheel Drive

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  1. Front Wheel Drive Coupling

  2. الاسم فصل رقم • بولا عماد كامل 2 27 • عماد ابراهيم انيس 4 3 • مايكل جورج توفيق 4 13 • مينا سمير عوض 7 17 • مينا فيكتور فرحات 7 18 • هانى سامى ملاك 7 21 • هانى مجدى كامل 7 22

  3. Introduction

  4. As we know the front wheel change its direction during movement so the front wheel drive was impossible to connect movement from the gear box to the front wheel until CETROEN company has developed the front wheel drive system in 1950 and it was a great invention to transmit power from a rotating axel to another one in a mobile place other companies find that this system saves a lot of materials and money and so a lot of companies applied this system in production until it became the existing drive system in most of cars nowadys

  5. How the cycle work The motor transmit the movement to the gear box where the coupling is attached. The coupling ties between the gear box and the front wheel , because the front wheel change its direction when turning right and left and also up and down so the coupling shaft should have some elastic movement when it is attached to the housing

  6. Advantages • Cheaper in production and processing • Needs less parts than BWD • Give more free area under the car body and this help to attach the break and exhaust pipes • Lighter and this help in acceleration , breaking and petrol consumption .

  7. Improve car drive as engine gear box and tranaxles all are found above the leading wheels and this prevent car sliding ( load distribution : 60 % on the front axel and 40 % on the back axel )

  8. Disadvantages • It depends on the coupling which are rapidly damaged • Difficult to control direction at starting movement • Most of car weight is concentrated in the front and that make the car unstable during movement

  9. Coupling or c.v. joints( constant velocity joints ) General View A shaft ties between the gear box and the front wheels to provide or transmit power with enabling the movement right and left and up and down

  10. Its position in the car

  11. Parts of coupling

  12. راس الكوبلن 1 – Housing القلب 2 – inner race القفص 3 – cage البلى 4 – balls حزام او افيز 5 – Clamp كاوتشة او جلدة 6 – boot حلقة قفل ( تيلة ) 7 – cir clip عمود الكوبلن 8 – shaft

  13. Separated Parts

  14. Parts sketched together

  15. Coupling Failure صوت الطقطقة knocking noise • ظهور تجويف بالمجرى التى يتحرك فيها البلى بأحد جزئى الكوبلن الذى يتحرك بينهم البلىو الموضح فى الصورة باللون الاحمر

  16. فعندما تتحرك البلية فى المجرى الخاصة بها تقابل فى طريقها هذا التجويف البسيطالذى هو عبارة عن مطب صغير بالمجرى التى تمر بها البلية لتنزل به ثم تصعد مرة اخرى لتكمل مشوارها داخل الكوبلن حسب مدى التفاف عجل السيارةو نتيجة هذه الحركة الغير سليمة للبلي داخل الكوبلن نسمع صوت الطقطقة المعروفة و عادتا يحدث الصوت عند التفاف عجل السيارة فقط و هذا لان البلى لا يتحرك كثيرا فى السير الى الامام بالسيارة فلا يتاثر بالتجويف الذى حدث.اما فى حالة تحريك عجل السيارة لليمين او لليسار يمر البلى على التجويف الصغير بالمجرى التى تحكم حركته.و ينزل بالتجويف ثم يصعد مرة اخرى مصدرا صوت الطقطقة التى نسمعها فى حالة تلف الكوبلن كما وضحت سابقا و لهذا نعتبر ان الكوبلن لم ينكسر بعد و لكن حدث خلل فى الحركة الميكانيكية بداخله ادت الى ظهور هذا الصوت اولا و اذا تم اهماله كثيرا سيصل الامر الى تفتيت البلى نفسه او الحلقة التى تحكمه بسبب ازدياد عمق التجويف الذى يمر به البلى اثناء الحركة و هذه تعتبر مرحلة خطيرة و تحدث نتيجة الاهمال الشديد فى الاصلاح

  17. Failure causes : -Bad driving style at a lot of people which cause erosion in the groove where the balls move along it . And this cause knocking sound (noise) specially during turning right and left -Boot damage are one of the most important causes of coupling failure as when the boot is damaged the lubricant is dropped out of it and this increase friction between parts and make failure -Bad material of coupling

  18. How to protect 1- donot try to fix the coupling but try to replace it 2- keep away from the bad drive style 3- examine the boot from time to another and replace it if it is damaged كاوتشة سليمة كاوتشة مقطوعة

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