{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

1339 11 a compound epicyclic gear is shown

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: The wheels B and C are compound and rotate together on a pin carried at the end of arm E. The wheel D has internal teeth and is fixed to the outer casing of the block so that it does not rotate. The wheels A and B have 16 and 36 teeth respectively with a module of 3 mm. The wheels C and D have a module of 4 mm. Find : 1. the number of teeth on wheels C and D when the speed of A is ten times the speed of arm E, both rotating in the same sense, and 2. the speed of wheel D when the wheel A i s fixed and the arm E r otates at 450 r.p.m. anticlockwise. [Ans. TC = 13 ; TD = 52 ; 500 r.p.m. anticlockwise] Fig. 13.39 11. A compound epicyclic gear is shown diagrammatically in Fig. 13.40. The gears A , D and E are free to rotate on the axis P. The compound gear B and C rotate together on the axis Q at the end of arm F. All the gears have equal pitch. The number of external teeth on the gears A , B and C are 18, 45 and 21 respectively. The gears D and E are annular gears. The gear A rotates at 100 r.p.m. in the anticlockwise direction and the gear D rotates at 450 r.p.m. clockwise. Find the speed and direction of the arm and the gear E. [Ans. 400 r.p.m. clockwise ; 483.3 r.p.m. clockwise] 12. In an epicyclic gear train of the ‘sun and planet type’ as shown in Fig. 13.41, the pitch circle diameter of the internally toothed ring D is to be 216 mm and the module 4 mm. When the ring D is stationary, the spider A , which carries three planet wheels C of equal size, is to make one revolution in the same sense as the sun wheel B for every five revolutions of the driving spindle carrying the sunwheel B . Determine suitable number of teeth for all the wheels and the exact diameter of pitch circle of the ring. [Ans. TB = 14 , TC = 21 , TD = 56 ; 224 mm] Fig. 13.40 13. Fig. 13.41 An epicyclic train is shown in Fig. 13.42. Internal gear A is keyed to the driving shaft and has 30 teeth. Compound wheel C and D of 20 and 22 teeth respectively are free to rotate on the pin fixed to the arm P whic...
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online