Reliability
213
Figure 4.19. Automobile gear box used with permission [4.1]
in--out
Figure 4.20. Third gear series reliability model for Fig. 4.19.
Now for 93% of the time with third gears or direct drive.
2
2
R3rd = R1R3R4RsR7
Second Gear Reliability Model
Second highest, 2nd gear, speed is obtained Fig. 4.19 by slipping D to the
right until it comes into contact with H, the ratio of gears then being A
to G and H to D; F remains as shown. This creates a series reliability model
Eq. (4.24) for 3% of the time, shown in Fig. 4.21, resulting in the numbered
reliabilities are
R1 - four bearings and seals
R2 - Two gear pairs