This is one of the projects that I have worked in a team. My task was to provide the engineering design based on calculations by my esteemed colleagues.

1. Friction Clutch Design Made by: Ina Efremova, fac.no. 221206036 SvetoslavOvcharov, fac.no. 221206020 KirilIliev, fac.no. 221206007

2. Design of a friction clutch Specifications: Clutch purpose: actuated 2-disk clutch Type of actuation: mechanically Driven machine nominal torque: Tnom=750 N.m Nominal input speed: n1=650 min-1 Type of prime mover: electric motor Type of driven machine: passenger elevator Operating conditions: dry Number of clutch engagements per hour: 30 h-1

3. What is clutch? A clutch is a mechanism for transmitting rotation, which can be engaged and disengaged. Clutches are useful in devices that have two rotating shafts. In these devices, one shaft is typically driven by a motor and the other shaft drives another device. The clutch connects the two shafts so that they can either be locked together and spin at the same speed (engaged), or be decoupled and spin at different speeds (disengaged).

4. Motor, Clutch and Pulley of an elevator in a panel block of flats

6. Design of the clutch We have chosen steel and sintered bronze for the friction surfaces. Our clutch has two driving and two driven disks, and 3 pairs of friction surfaces, which means that in our case z=3. The switching mechanism consists of three levers. We also have two key joints, one for each shaft.

7. Design of the shaft We calculated that the minimum shaft diameter “d” must be greater than 33,47 mm. Therefore we choose to take 35 mm.

8. Design of the disks We calculated the allowable surface pressure [p], which in our case is 1,4 MPa. First we calculated Dave’, which is 0,061 m in order to obtain the values of the working width “b” and the minimum friction disks diameters “D1” and “D2”(b=0,015m; D1=0,076m; D2=0,046m). From construction point of view we took: D1=0,095m and D2=0,071m. With the new values of D1 and D2, we finally calculated the average diameter Dave=0,083m and b=0,012m. For the normal pressing force of the disks’ surfaces F we obtained the value of 3012 N.

10. Key joint design We choose standard key joint from Bulgarian National Standards 10X6X40 по БДС 13599-76 with the following parameters: b=0,01m; h=0,006m; t1=0,0035m; t2=0,0028m; l=0,04m. Therefore we calculated that the minimum working length of the key joint is lpmin=0,0298m. We took lp to be 0,03m.

12. Assembly 3D

15. Thank you for your attention!