Common material used for rotary damper

TD27/28

PBT: Poly Butylene Terephthalate

PBT is tough, rigid and excellent in thermal aging 
resistance. 
In addition, the electrical characteristics are  
great in a wide temperature range, the water absorbency is low, and weather resistance and chemical resistance are well balanced.

(PBT is used for TD27/TD28, TD99 etc.)

PA: Polyamide

TD118

Polyamide has good mechanical properties, and it is 
resistant to tension, compression, bending and impact.
It is not easily damaged. It is also resistant to heat and can withstand more than 160 ℃ if glass fiber is added.
Moreover, chemical resistance and oil resistance are 
very strong and are not affected by machine oil.

(PA is used for TD118 and customized products.)


PC: Polycarbonate

TD88

Polycarbonate is a plastic with high transparency and 
impact resistance. Its heat resistant temperature is 
120 ℃- 130 ℃ and it has high resistance in resin.        Its cold resistance is around -100℃. Even among resins, it has considerable resistance at low temperature, and it is highly resistant even at high temperature range.

(PC is used for TD88, TD96 etc.)

POM: Polyacetal

TD14

Polyacetal is a material excellent in abrasion resistance and is self-lubricating. It is also excellent in mechanical  properties such as rigidity and toughness, and it has high temperature stability. 
POM is a material that is often used as a substitute for metals, especially due to these properties.

(POM is used for TD14.) 

PEI: Poly Ether Imide

Poly Ether Imide is a resin which is a combination of 

TD69

imide bond, imparting excellent heat resistance and 
strength, and also shows good processability.
It maintains mechanical strength even at high 
temperature and is excellent in flame retardancy.          It is also excellent in chemical resistance and strong 
against hot water.  In addition, it shows stable 
electrical characteristics and withstands 
ultraviolet rays and radiation.

(PEI is used for TD69)

PPS: Poly Phenylene Sulfide

Poly Phenylene Sulfide has excellent heat resistance, so it can be used for a long time at high temperature.  It’s also excellent in chemical resistance, so with oils and fats that dissolve PPS at 200 ° C or lower, there is no solvent. It is also excellent in flame retardancy, tensile strength and bending strength.  It has a feature that the shrinkage ratio during molding is small, so it has dimensional stability.

(PPS is used for customized products)

PES: Poly Ether Sulphone

It is also excellent in mechanical properties, and chemical properties such as hot water resistance, chemical resistance, flame retardancy, and molding processability. By taking advantage of these features it is used in a wide range of fields, such as electronic parts, automobiles, aircraft, medical care, food, paint and so on.

(PES is used for customized products)

  

Die Casting

Die casting is a casting method in which non-ferrous metals are melted in precision molds, and are poured at high speed and pressure using a die-casting machine and molded instantaneously. Die cast products have superior features such as high dimensional accuracy, excellent strength, and beautiful appearance.

ZDC: Zinc Die Casting

Zinc Die Casting, which has longer die life than

TD42

 aluminum die casting, is excellent in processability, 
so it is possible to manufacture parts with 
complicated shapes and parts with extremely high         dimensional accuracy. In addition, it enables 
advanced thinning, and because of its small 
draft angle, it is easy to mold after casting.

(Zinc Die Casting is used for TD42, TD112 etc.)

ADC: Aluminum Die Casting

It is economical and easy to cast, so aluminum die casting is a suitable method for mass production. It can produce products with high strength, excellent conductivity, thermal conductivity, excellent corrosion resistance and processability.

(Aluminum Die Casting is used for customized products)

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What’s damping torque?

Damping Torque

Damping Torque is an instantaneous force that rotates an object around its rotary shaft(axis). Torque expresses the necessary force when moving an object. For example, when riding a bicycle, torque is the pushing force of the pedal. If you are pushing the pedal strongly, then the torque is greater.

The greater the force required to support the lid, and the greater the length of the object, the greater the objects torque will be.

Example calculation in case of toilet lid

Weight: 1kgf(=9.8N)

Length: 0.4m(gravity point=0.4m/2=0.2m)

↓

9.8N×0.2m=1.96N・m

↓

The following TOK rotary dampers would be suitable!

　　TD69　              TD99     　        TD100    　　　     TD112

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Damping torque generation method

There are mainly 3 ways to generate torque of dampers.

1.       Pressure: it moves like syringe

2.       Sliding Resistance: friction movement

3.       Shear Resistance: it moves like scissors

They are used for the following types of dampers.

1.       Pressure → Partial rotation and Continuous rotation angle damper

2.       Sliding Resistance → Friction damper

3.       Shear Resistance → Partial rotation angle damper

Here is the inside of housing↓

Partial rotation angle damper

Continuous rotation angle damper

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What’s silicone oil?

TOK rotary dampers are mostly filled with silicone oil.

Silicone oil is colorless liquid and the most versatile product among silicone products. The silicone oil has beneficial effect in heat resistance, cold resistance and electrical quality. It also has different interface properties, and has excellent characteristics not found in mineral oil, animal and vegetable oils and various synthetic oils. In addition, silicone oil has wide range of viscosity.

Therefore, it is used in a wide range of fields such as electric equipment, lubricating, heat and cold resistance, water resistance, paint resin, and fiber oil.

Silicone Oil

Damper with Silicone Oil

Using various viscosity oils, TOK can provide you with multiple torques of dampers as the customer's request.

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What's rotary damper?

Rotary damper is the mechanical parts to buffer the impact of the lid closing / opening. Rotary damper is effective for consistent motion, soft closing / opening, improved safety, and makes a product luxurious.

We manufacture oil filled style rotary dampers and there are 2 types of rotary dampers: partial rotation angle type and continuous rotation angle type. Partial angled rotary damper has limited operation angle. e.g. 110° and 180°, etc. On the other hand, continuous rotation angle rotary damper rotates 360° without limit.
　　　　　　　　　　　

Partial rotation angle damper

Continuous rotation angle damper

Our rotary dampers are used in multiple applications such as kitchen, bath, furniture, automotive, and more.

The rotary damper is very important for our quality of life!

Application examples:

Sliding Screen Doors

Garbage Can

Blinds

Wall Table

Console Box

Want to know how to install rotary dampers?

You can learn how to install our products on multiple applications.

>>Learn more

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TOK will provide ONLY subscribers with valuable technical information.

The newsletter will be delivered about once per month, If you would like to receive the newsletter from us, you can subscribe via our contact form.

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TOK headquarter's office relocation

We are pleased to announce that effective from 20^th March 2018, TOK headquarters in Japan will be relocated to new building as follows address, the main TEL and FAX numbers remain unchanged.

TOK headquarters new building location at:

TOK, Inc.

1-17-12 Azusawa, Itabashi
Tokyo, 174-8501 JAPAN

TEL: +81-3-3969-1584

FAX: +81-3-3969-8819

Thank you very much for your kind attention and continuous support to TOK group.

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