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Bore Size Selections<br />
Series <strong>CH2</strong>E/<strong>CH2</strong>F/<strong>CH2</strong>G/<strong>CH2</strong>H<br />
Technical Data 1<br />
Relation of generated force, bore size and pressure<br />
When a <strong>cylinder</strong> is nearly at rest, the relation of generated force, bore<br />
size and pressure can be expressed with the following formulas.<br />
Fp₁ = µ1 x Ff₁<br />
Fp₂ = µ2 x Ff₂<br />
η<br />
Ff₁ =<br />
4<br />
D² x P<br />
η<br />
Ff₁ =<br />
4<br />
Formula (1)<br />
Formula (2)<br />
Formula (3)<br />
(D² – d²) x P Formula (4)<br />
Fp₁: Generated extension force of <strong>cylinder</strong> (N)<br />
Fp₂: Generated retraction force of <strong>cylinder</strong> (N)<br />
Ff₁: Theoretical extension output (N)<br />
Ff₂: Theoretical retraction output (N)<br />
P: Operating pressure (MPa)<br />
D: Bore size (mm)<br />
d: Piston rod diameter (mm)<br />
µ1: Cylinder extension load pressure coefficient<br />
µ2: Cylinder retraction load pressure coefficient<br />
Load type<br />
With small inertial force<br />
With large inertial force<br />
Selection standards<br />
A <strong>cylinder</strong>'s generated force will be lower than the theoretical output<br />
due to the following factors.<br />
(1) Sliding resistance on the <strong>cylinder</strong> bearings and seals, etc.<br />
(2) Pressure loss in hydraulic equipment and piping<br />
(3) Frictional resistance in moving parts of machinery<br />
It is necessary to select bore sizes considering these factors.<br />
The ratio of the load to the theoretical output is the load factor. Select<br />
bore sizes using the values below as reference for the load factor.<br />
Load factor<br />
60 to 80%<br />
25 to 35%<br />
Series <strong>CH2</strong>E/<strong>CH2</strong>F/<strong>CH2</strong>G/<strong>CH2</strong>H Theoretical Output<br />
OUT<br />
IN<br />
Unit: N<br />
B series rod<br />
C series rod<br />
Bore size<br />
(mm)<br />
32<br />
40<br />
50<br />
63<br />
80<br />
100<br />
40<br />
50<br />
63<br />
80<br />
100<br />
Rod size<br />
(mm)<br />
18<br />
22.4<br />
28<br />
35.5<br />
45<br />
56<br />
18<br />
22.4<br />
28<br />
35.5<br />
45<br />
Operating<br />
direction<br />
OUT<br />
IN<br />
OUT<br />
IN<br />
OUT<br />
IN<br />
OUT<br />
IN<br />
OUT<br />
IN<br />
OUT<br />
IN<br />
OUT<br />
IN<br />
OUT<br />
IN<br />
OUT<br />
IN<br />
OUT<br />
IN<br />
OUT<br />
IN<br />
Piston<br />
area (mm²)<br />
804<br />
550<br />
1256<br />
862<br />
1963<br />
1347<br />
3116<br />
2126<br />
5024<br />
3434<br />
7850<br />
5388<br />
1256<br />
1002<br />
1963<br />
1569<br />
3116<br />
2500<br />
5024<br />
4035<br />
7850<br />
6260<br />
1.0<br />
804<br />
550<br />
1256<br />
862<br />
1963<br />
1347<br />
3116<br />
2126<br />
5024<br />
3434<br />
7850<br />
5388<br />
1256<br />
1002<br />
1963<br />
1569<br />
3116<br />
2500<br />
5024<br />
4035<br />
7850<br />
6260<br />
3.5<br />
2813<br />
1923<br />
4396<br />
3017<br />
6869<br />
4715<br />
10905<br />
7442<br />
17584<br />
12020<br />
27475<br />
18859<br />
4396<br />
3506<br />
6869<br />
5490<br />
10905<br />
8751<br />
17584<br />
14121<br />
27475<br />
21911<br />
Operating pressure (MPa)<br />
5.0 7.0<br />
4019 5627<br />
2748 3847<br />
6280 8792<br />
4311 6035<br />
9813 13738<br />
6735 9429<br />
15578 21810<br />
10632 14885<br />
25120 35168<br />
17172 24041<br />
39250 54950<br />
26941 37718<br />
6280 8792<br />
5008 7012<br />
9813 13738<br />
7843 10980<br />
15578 21810<br />
12501 17502<br />
25120 35168<br />
20174 28243<br />
39250 54950<br />
31302 43823<br />
10<br />
8038<br />
5495<br />
12560<br />
8621<br />
19625<br />
13471<br />
31157<br />
21264<br />
50240<br />
34344<br />
78500<br />
53882<br />
12560<br />
10017<br />
19625<br />
15686<br />
31157<br />
25002<br />
50240<br />
40347<br />
78500<br />
62604<br />
14<br />
11254<br />
7693<br />
17584<br />
12070<br />
27475<br />
18859<br />
43619<br />
29769<br />
70336<br />
48081<br />
109900<br />
75435<br />
17584<br />
14023<br />
27475<br />
21961<br />
43619<br />
35003<br />
70336<br />
56486<br />
109900<br />
87645<br />
Theoretical output (N) = Pressure (MPa) x Piston area (mm²)<br />
26
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