Page 291 - Design for Six Sigma a Roadmap for Product Development

Axiomatic Design 261

x 1.3.2.1 : Displacement
Mechanism
• y 1.1 Charge chamber • x (Expanding chamber)
• y 1.2 Discharge chamber at • x 1.1 Collapsing volumes)
uniform rate • x 1.2 (Sealing devices — # 1 to # 8)
• y 1.3 Does not allow slip flow to • : 1.3
pass from outlet to inlet
• :

x 1.3.1 Sealing Device # 1
Rotor Clearance to Chamber
• y 1.3.1-1 Minimize leak (loss of
flow) from high pressure to low
pressure • x 1.3.1-1 Close clearance
• y 1.3.2-1 Lubricate running
surface of chamber

Figure 8.15 The zigzagging up to sealing device 1.

Effect of Coupling

y 1.3.1 Wasted Leakage
(not used for P-diagram
lubrication)
Close tolerance
y 1.3.2

= tolerance
x 1.3.1
t t t* Ring rotor Leakage
The tolerance clearance
nominal for to chamber Lubricate
lubrication chamber surface

Device # 1: Ring Rotor x 1.3.1-1
Clearance to Chamber Close Clearance
y 1.3.1 -1 Minimize A 12 Cover flatness
leak (loss of flow) from high Pocket flatness
pressure to low pressure Cover deflection
y 1.3.2-1 Lubricate A 21 Fluid temperature
running surface of chamber Fluid condition
Figure 8.16 The P-diagram of sealing device 1 without DFSS.