Parker O-Ring Handbook.pdf

5.30.2 Calculation of Drive Belt Crossed Design
1) Calculation of O-Ring size d1:
Known – D1 and D2, diameter of pulley
C center line distance of pulleys
S elongation as a decimal (e.g. 10% = 0.1)
a) Calculation of drive belt L:
L = 2 x C + 1.57 x (D1 + D2) + (D1-D2) 2
4xC
b.) Calculation of O-Ring inside diameter d1:
d1 = L
3.14 x (1.0 + S)
c) O-ring is selected according to the O-Ring size
list. If a size is required between the sizes then
the smaller size should be taken.
2) Calculation of elongation S:
Known - d1 inside diameter of O-Ring
C center line distance of pulleys
D1 and D2, diameter of pulleys
a) Calculation of drive belt L: (see above, 1a)
b) Calculation of elongation S as a decimal:
S = L - 1
3.14 x d1
3. Calculation of center line distance C of pulley:
Known – d1 inside diameter of O-ring
S elongation as a decimal (e.g. 10% = 0.10)
D1 and D2, diameters of pulleys
a) Calculation of factor B:
B = 3.14 x d1 x (S + 1) – 1.57 x (D1 + D2)
b) Thereafter calculation of center line distance C:
C = B+√B2 – (D1 – D2) 2
4
Guide For Design Table 5-1
If Desired Dimension
is Known for
Cylinder Bore
or Male Gland
Cylinder Bore I.D
Piston or
Cylinder O.D.
Rod or Gland
Sleeve O.D.
Rod Bore or
Female Gland
Housing Bore I.D.
*For information on groove width refer to Design Chart 5-1A
Design Guide 5-1: Guide For Design Chart 5-1
Select Closest
Dimension in Column
A
C
B
H
Parker O-Ring Handbook
Read Horizontally
in Column To Determine Dimension for
G
C
F
G
A
F
G
J
H
G
J
B
r1
5.31 O-Ring Glands
O
Or
O
D1
D2
r2 0.2 – 0.4
Flash free
5.31.1 O-Ring Glands (Per SAE AS4716) for Aerospace
Hydraulic (Reciprocating) Packings and Gaskets
Design Chart 5-1 provides the basis for calculating gland
dimensions for standard O-ring sizes. These dimensions
have been calculated and are listed in Design Table 5-1. The
procedures for the use of Design Table 5-1 are outlined in
Design Guide 5-1.
After selecting gland dimension, read horizontally to determine
proper O-ring size number per AS568A.
There are a number of various O-ring gland design specifi cations
in use throughout industry. These include Aerospace
Recommended Practice (ARP) 1232, 1233 and 1234. There
also is the International Standards Organization (better known
as ISO) Specifi cation 3601/2. Each of these and other less
accepted documents have slight dimensional variations from
those found in this Handbook.
d2
Pulley gland radius
For other cross-sections
r1 = 0.49 x d2
Surface roughness:
Rmax < 6.3 µm
Ra < 1.6 µm
Groove Width*
Piston or Cylinder O.D.
Groove O.D.
Groove Width*
Cylinder Bore or Male Gland
Cylinder Bore I.D.
Groove O.D.
Groove Width*
Groove I.D.
Rod Bore or Female Gland
Housing Bore I.D.
Groove Width*
Groove I.D.
Rod or Gland Sleeve O.D.
Parker Hannifi n Corporation • O-Ring Division
2360 Palumbo Drive, Lexington, KY 40509
Phone: (859) 269-2351 Fax: (859) 335-5128
www.parkerorings.com
r1
in mm in mm
2.62 1.25 + 0.1
3.53 1.70 + 0.1
5.33 2.60 + 0.1
6.99 3.50 + 0.15
Dynamic O-Ring Sealing
5-21