Note 2: When descending, the operating air pressure: P, should be lower than when ascending,
because heavier loads can be carried.
E
：
Total impact energy
…
[J]
E
1
：
Kinetic energy
…
[J]
E
2
：
Additional energy by cylinder thrust
…
Fo·L [J]
E
3
：
Additional energy by load mass
…
m·g·L [J]
m
：
Load mass [kg]
v
：
Impact speed [m/s]
g
：
Gravity acceleration 9.8 [m/s
2
]
Fo
：
Cylinder thrust
…
= ·D
2
·P [N]
Fo
：
[D: Cylinder bore (mm) P: Operating air pressure (MPa)]
L
：
Absorbing stroke of shock absorber [m]
m
･
v
2
2
π
4
E＝E
1
＋E
2
＋E
3
＝
＋F
O
・L＋m・g・L
E＝E
1
＋E
2
−E
3
＝
＋F
O
・L−m・g・L
Note 1: For impact on incline,
E
3
becomes E
3
'
= m
・
g
・
L
・
sin
θ
.
Note 1: For impact on incline,
E
'
3
becomes E
''
3
= W
'
・
L
'
・
sin
θ
.
Horizontal impact
Vertical impact
Note 1
When descending
Note 2
When ascending
m･
v
2
2
E
'
＝
E
'
1
＋
E
'
2
＋
E
'
3
＝
＋
F
'
O
・
L
'
＋
W
'
・
L
'
W
'
･
v
'
2
2g
'
m･
v
2
2
E
'
＝
E
'
1
＋
E
'
2
−
E
'
3
＝
＋
F
'
O
・
L
−
W
'
・
L
'
W
'
･
v
'
2
2g
'
E
＝
E
1
＋
E
2
＝
＋
F
O
・
L
m
･
v
2
2
E
'
＝
E
'
1
＋
E
'
2
＝
＋
F
'
O
・
L
'
W
'
･
v
'
2
2g
'
→
m
→
Fo
L
Fo
m
→
L
→
L
Fo
→
→
m
θ
→
Fo
m
Calculation of impact energy
0
0.5
−0.5
1.0
−1
1.5
2.0
2.5
3.0
3.5
4.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
●
ORV16, 20
0
0.5
−0.5
1.0
−1
1.5
2.0
2.5
3.0
3.5
4.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
●
ORV25
,
32
0
0.5
−0.5
1.0
−1
1.5
2.0
2.5
3.0
3.5
4.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
●
ORV40, 50
ORV16
ORV20
ORV25
ORV32
ORV40
ORV50
Displacement (mm)
Displacement (mm)
Displacement (mm)
Pressure (MPa)
Pressure (MPa)
Pressure (MPa)
Amount of stroke change due to the rubber bumper
In the slit type rodless cylinders
ORV
series, note
that use of the rubber bumper results in the
stroke varying according to pressure as shown in
the graphs below. (The graphs below show the
displacement of the rubber bumper on one side.)
→
W
'
→
F
'o
L
'
'
→
→
F
'o W'
'
L
'
→
→
L
'
'
F
'o W'
θ
→
W'
F'o
Note 2: When descending, the operating air pressure: P
'
, should be lower than
when ascending, because heavier loads can be carried.
E
'
：
Total impact energy
…
[ft·lbf]
E
'
1
：
Kinetic energy
…
[ft·lbf]
E
'
2
：
Additional energy by cylinder thrust
…
F
'
o·L
'
[ft·lbf]
E
'
3
：
Additional energy by load weight
…
W
'
· L
'
[ft·lbf]
W
'
：
Load weight [lbf]
v
'
：
Impact speed [ft./sec.]
g
'
：
Gravity acceleration 32.2 [ft./sec.]
F
'
o
：
Cylinder thrust
…
= ·D
'
2
·P
'
[lbf]
Fo
：
[D
'
: Cylinder bore [in.] P
'
: Operating air pressure [psi.]]
L
'
：
Absorbing stroke of shock absorber [ft.]
W
'
･
v
'
2
2g
'
π
4
Caution:
When using a rodless cylinder, select a
suitable cushion and/or shock absorber
to prevent rebounding. Rebound could
result in such problems as breakage of
the seal band.
1mm = 0.0394in. 1MPa = 145psi.
1054̲1067ORVｼﾘｰｽﾞ̲ENG 07.9.10 1:58 AM ページ1056
