Page 1285 - MiSUMi 2025

Economy series
Economy series How to Mount Stopper Screws Selection Method Economy series
Economy series
How to Mount Stopper Screws
Technical Calculation
Shock Absorbers Shock Absorbers
Shock Absorbers
Shock Absorbers
Stopper Nut QShock Absorbers - Oil Type
For this system, oil is mainly utilized. Compared with other cushioning materials (rubber, spring, air etc.), they are compact and capable of repeatedly
It can be used with both cap and capless type of Shock Absorbers and adjust Stroke to extend the lifetime of the Absorber. absorbing large impact energy softly without rebound. Internal structure and basic principle of oil type shock absorbers are shown as follows.
When an object collides with a piston rod, the oil in the pressure chamber is compressed by a piston.
Stopper Nut Application Diagram The clearance between inner tube and piston is so small that compressed oil is forced out
of the orifices. At this point, the impact energy is converted into heat energy by dynamic
Shock Absorber Stroke Impact Object resistance.
The piston rod sinks into the shock absorber body so that the oil equal in
Shock Absorber volume to the piston moves into the accumulator. Piston Rod Piston Orifice
This mechanism provides an ideal shock absorbing action.
Various absorption characteristics can be obtained depending on the number
and size of orifices. m
Please note that when the wrong collision speed is selected, some abnormal
reaction may occur during collision or the impact energy may not be absorbed in
an ideal manner. Cap Accumulator Inner Tube Pressure Chamber, Oil
Set Stroke
Stopper Nut Stopper Nut QProcedure of Selection
(1) Calculation of Inertial Energy (E1) Fig.1 Calculate the temporary stroke S' with the Inertial Energy E1.
(Adjustable / Fixed Type)
According to examples of calculation for selection, calculate (mm) 50
inertial energy based on collision mass (m), collision velocity 40
H (V), moment of inertia (I) and collision angular velocity ( ). 35
(2) Temporary Decision of Absorber Stroke 30
S L L Obtain the temporary stroke (S') based on Fig. 1. Temporary Stroke S' 25
20
M8~M12 M14~M42 (3) Calculation of Additional Energy (E2') 15
Confirm whether there is propulsion (F) or not and calculate 10
the additional energy according to examples of calculation 5
for selection. 0 0.1 0.52 1 4.4 6.87 7.9 19.6 29.4 39.2 88.2 196 200 392 1000(J)
(4) Calculation of Total Energy Inertial Energy E1
Calculate the total energy from the sum of inertial energy (E1) Fig. 2 Select the orifice type from energy ratio (additional energy
E2' / inertial energy E1)
and additional energy (E2').
5 17
(5) Check Equivalent Mass
According to examples of calculation for selection, calculate 4 Irregular Multi-Orifice
(Double Motion)
the equivalent mass and confirm whether it is less than the Energy Ration Single Orifice
max. equivalent mass in the catalog (me'). 3 Floating Joints / O-Rings Shock Absorbers / Rod End Bearing /
(6) Select Absorption Characteristics Structures from Energy Ratio E2'/E1 2
Select an orifice type from Fig 2 temporarily. 1 Multi-Orifice
Mounting Flange (7) Check Max. Absorbed Energy per Minute 0
2
Equipped with large-sized Shock Absorber, no need to thread the workpiece, directly fixed with a flange, Calculate the energy corresponding to one minute (ET) from 0.08 0.3 0.5 0.7 1 Collision Velocity 3 (m/s)
easy installation the operating cycle (time / min) and total energy, and con- E For Single, Irregular Multi, Multi Orifice Types, these are the Absorbers Shock
Support Plate firm whether or not the value is within the operating range. values of The Adjustable and The Fixed Types.
T L
T1 Mounting Flange QPrecautions of Use * If both Single Orifice and Multi-Orifice are applicable, select P.17-003
Shock Absorber
irregular Multi-Orifice.
1. Not Completely Sealed * If both Irregular Multi-Orifice and Multi-Orifice are applicable,
- Although this product is filled with oil and uses seals to prevent leakage, select Multi-Orifice.
H2 complete sealing is not guaranteed. * For Speed S Type, the collision velocity is 0.08~0.5m/s. Bearings Rod End
H1 H - Do not use in environments where oil contamination is unacceptable.
2. Follow the Specified Mounting Torque Tab.1
- Do not exceed the specified tightening torque when installing. (See Tab.1) Screw Outer Diameter (mm) M4×0.5 M6×0.75 M8×1.0 M10×1.0 M12×1.0
Flange Mounting 3. Do Not Use in Vacuum, High-Pressure, or Coolant-Exposed Environments Nut Tightening Torque (N·m) 0.35 0.85 3.9 7.8 7.8 P.17-012
M M1 - Such environments may cause seal deterioration or malfunction.
- Use models with coolant-resistant specifications when necessary. Screw Outer Diameter (mm) M14×1.5 M20×1.5 M25×1.5 M36×1.5 M42×1.5
29.4
9.8
Nut Tightening Torque (N·m)
98
392
49
4. Stop Use Immediately in Case of Abnormalities Joints Floating
- If the piston rod does not return properly or if significant oil leakage is observed, internal damage may have occurred.
- Continued use may lead to equipment failure or injury.
5. Select with Sufficient Energy Margin P.17-014
- Over time, internal oil depletion and part wear can reduce energy absorption performance.
- Select a model with at least 20-40% more capacity than the maximum expected impact energy.
6. Avoid Angular and Off-Center Impacts O-Rings
Note: The stopper nut and mounting flange must be ordered together with the shock absorber, and cannot be ordered separately. - Impacts with misalignment greater than ±2.5° can cause rod bending or performance degradation.
* “-” shows unavailable size 7. Operating Temperature Range
- Use within the range of −5°C to 70°C.
- Operating outside this range may cause deterioration of seals or accumulators. P.17-015
8. Regular Inspection and Proper Disposal
- Inspect regularly to ensure proper performance. Replace if any abnormalities are found.
17-005 - Dispose of internal oil in accordance with local environmental regulations. 17-006