HU 121 History of Engineering and Technology

1. HU 121 History of Engineering and Technology Pharos University in Alexandria Faculty of Engineering Fall 2013/14 Lect5 Engines

2. Outline • Engines • Definition • Types • The Cam • Al Jazari Engines • Al Jazari Cam • Pumps • Internal Combustion Engine HU121_Lect5_Engines

3. Engines Lecture 7 An engine converts energy Into useful mechanical motion. Mechanisms ? HU121_Lect5_Engines

4. Al Jazari • The first known engines were described by Al Jazari in the 13th century. • Al-Jazari inherited the knowledge of his predecessors, but he improved on their designs and added his own. • His book Al-Jami’ bayn al-Ilm wal Amal Al-Nafi’ fi Sina’at Al-Hiyal (Book of Knowledge of Ingenious Mechanical Devices) is a pioneering book in engineering. • This book was translated to English by Donald Roultedge Hill in 1947. أبُو اَلْعِزِ بْنُ إسْماعِيلِ بْنُ الرِّزاز الجزري HU121_Lect5_Engines

5. Cam Crankshaft and crank-slider mechanism Water-raising machines Automata Clocks Al Jazari Major Mechanical Devices HU121_Lect5_Engines

6. Main Features: it converts rotary motion into reciprocating motion through the crank-connecting-rod mechanism. it employs a double-acting principle(at the same time as one piston sucks, the other one delivers the water). it is the first pump known to have had true suction pipes. Al JazariDouble-acting Piston Engine HU121_Lect5_Engines

7. As the animal walks in a circle the horizontal axle is turned by the gears and the end of the crank slides in the hinged connecting rod causing it to oscillate around its hinge and thus causing the swape to rise and fall. • Fig 3 is a line drawing of the mechanism for this machine HU121_Lect5_Engines

8. Al Jazari’s Camshaft • The camshaft was conceived and described by Al-Jazari in1206. • He implemented the camshaft as part of • automata, • water-raising machines, and • water clocks. • The cam and camshaft later appeared in European mechanisms from the 14th century. • The camshaft is an essential mechanism for conceiving and designing the Internal combustion engines and pumps. HU121_Lect5_Engines

9. Modern Applications HU121_Lect5_Engines

10. HU121_Lect5_Engines

11. Internal Combustion HU121_Lect5_Engines

12. In the internal combustion system the cam and follower system are required to control the opening and the closing of the inlet and exhaust valves. The Role of the Cam in an Internal Combustion Engine HU121_Lect5_Engines

13. Cam Pump The follower is cylindrically shaped and moves within a tight fitting cylinder so liquid is sucked in and pushed out as the follower moves up and down. HU121_Lect5_Engines

14. Multiplex Pump HU121_Lect5_Engines

15. Review Questions 1. Al Jazari is considered one of the founders of modern engineering. • In what century did Al Jazari live? • List five of his major engineering contributions 2. Discuss the main features of Al Jazari Double-acting Piston Engine 3. Describe briefly the role of the cam mechanism in (a) An internal combustion engine and (b) A suction pump HU121_Lect5_Engines