Selection

Series

RB

Specific Product Precautions 1

Be sure to read before handling.

Refer to front matters 42 and 43 for Safety Instructions.

1681

Operating Environment

Caution

Danger

Warning

6. Drag characteristics

In general, the values of drag (reactive force generated during operation)

generated by the operating speed will vary in hydraulic shock absorber.

And then, by adopting “Porous orifice construction”, the RB series can

adapt to such this fast/slow speed and can absorb shock smoothly in a

wide range of speed.

But, the speed reduction (speed reduction G) would be larger around the

stroke terminal, depending upon the operating conditions. Please note

that it might be encountered that stroke time is long, motion is not

smooth, etc. If this would be a problem, we recommend that stroke

amount should be restricted by using our optional component like

“Stopper nut”, etc.

Danger

Warning

Caution

1. Energy absorption

Select a model so that the aggregated energy of impact object should

not exceed the maximum absorption energy. Otherwise, it could cause

changes in properties or result in damaging the shock absorber.

2. Corresponding mass of impacting object

Make a model selection, so that the corresponding mass of impacting

object does not exceed the allowable range. Pulsation will occur in buffer

and deceleration force, thus making it difficult to absorb shock smoothly.

3. Collision speed

Use it in the conditions that collision speed is within the specified range.

It could cause the changes in buffer characteristics or lead to damage a

shock absorber.

1. Static load

Design the system, so that any other forces than the buffer capacity or

impacts should not be applied to the piston rod which is stopped at the

retracted state.

1. Maximum operating frequency

Design the system in the conditions under which it is not used at the

frequency exceeding the specified maximum operating frequency. (But,

the maximum operating frequency will vary depending on the absorbed

energy.)

2. Stroke

The maximum absorption energy in the specifications cannot be exerted

unless the full stroke is used for both Series RB and RBL.

3. Work surface of an impact object

The contact surface of the impact object with which the piston rod comes

into contact must be highly rigid.

In the case without a cap, a high surface compression load is applied to

the contact surface of the impact body with which the piston rod comes

into contact. Therefore, the contact surface must be highly rigid

(hardness of HRC35 or more).

4. Be aware of the return force of the impact object.

If used in a conveyor drive, after the shock absorber has absorbed

energy, it could be pushed back by the spring that is built-in. For the

spring force in the specifications, refer to the column (page 1677).

5. Selection of size

As the number of operation proceeds, the maximum absorption energy

of shock absorbers will be decreased by the following reasons such as

abrasion, or deterioration, etc. of the internal working fluid. Taking this

into consideration, selecting a size which is 20 to 40% affordable against

the amount of absorption energy is recommended.

Caution

1. Temperature range

Do not use it, exceeding the specified allowable temperature range. Seal

could be softened or hardened or worn out, or leading to leak a working

fluid, deterioration, or impact characteristic changes.

2. Deterioration by atmosphere

Do not use the product in an environment where the product may be

damaged by salt or air which contains organic solvent, phosphoester

operating oil, sulfurous acid gas, chlorine gas or other acids. It may

deteriorate seals or corrode metals.

3. Deterioration by ozone

Do not use it under the direct sunlight on the beach, or by the mercury

lamp, or the ozone generator, because the rubber material will be

deteriorated by ozone.

4. Cutting oil, water, blown dust

Do not use the product under the condition, where the liquid such as

cutting oil, water, solvent, etc. is exposed either directly or in atomized

form to the piston rod, or where blown dust could be adhered around the

piston rod. This could cause malfunction.

1. Operation in an environment which requires explosion-proof

• When mounting in places where static electricity is accumulated,

implement a distribution of electrical energy by grounding.

• Do not use the materials for buffer face which might cause to spark by

collision.

1. Pressure

Do not use it in the vacuum state, which is substantially different from

the atmospheric pressure (above sea level) and in the atmosphere under

being pressurized.

2. Using inside a clean room

Do not use the shock absorber in a clean room, as it could contaminate

the clean room.

RB

Individual

-X

„

D-

„

-X

„

P1673-P1718-E.qxd

08.11.17 4:02 PM

Page 1681