Sliding bearings and Rolling bearings

We would like to introduce the basics of bearings.

Bearings are mechanical element mounted usually between a moving part and a stationary part. For example, TOK's bearings are used for drawer of desk, refrigerator and sliding door etc.

Bearings can be sorted into 2 types: Sliding bearings and Rolling bearings.

Characteristic of sliding bearings

・The shaft(=journal) and bearing face(=sleeve) are in direct contact, and the movement of shaft is supported by the face.
・Using oil or air pressure, it would be made a layer that separates the shaft from the bearing
・Simple mechanism due to without any rolling elements
・It can bear huge load.



Characteristic of rolling bearings

・Due to rolling balls or rollers, it 
receives the movement of the shaft and works to reduce the friction　resistance.　　　　　　　　　　　 　
・Balls or rollers would be used for rotating.
・Smooth rotating
・Load would be received at a point


　　　

Rolling bearings can be sorted into 2 types: Radial bearings and Thrust bearings.

・Radial bearings: support perpendicular load to the shaft
・Thrust bearings: support parallel load to the shaft

The types are further subsorted, for example, in the case of radial bearings, it is sorted into radial ball bearings and radial roller bearings.

Radial ball bearings: Balls are used as rolling elements between the outer race and inner race.
　
・Deep groove ball bearings…………This is the most common type. Available to high speed rotation, radial and thrust load.
・Angular contact ball bearings……This type of bearing has contact angle. Available to one-way thrust load.
・Magnet ball bearings………This type of bearing has been developed for the generator of an internal combustion engine. Typically 2 pcs of bearings are used for 1 unit of application.
・Double row angular contact ball bearing……Available to bi-directional thrust load.
・Self-aligning ball bearing…………It has self^aligning and can be used in places where shaft deflection is likely to occur.


Radial roller bearings: Rollers are used as rolling elements between the outer race and inner race.
　

・Cylindrical roller bearing…………Available to high speed rotation and high load compared to ball bearings.
・Tapered roller bearings…………It has been often used for automotive. Available to high load.
・Self-aligning roller bearing……Available to radial and thrust load and impact load.
・Needle roller bearings…………The size is compact. Not available to thrust load.


As mentioned above, there are various types of bearings, so it is necessary to use appropriate bearings depending on the application.
TOK has been providing especially deep groove ball bearings, therefore we will explain you about it in detail in the next article.

TOK Newsletter

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.

Written by Hatsune
Translated by Hiro

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What's deep groove ball bearings?

The deep groove ball bearings are the most well-known bearings and which meet the requirements of high revolution and low noise.

These can be divided into 2 types of bearings: steel ones and plastic ones, and they can be used for several applications depending on the conditions.

The advantages of choosing steel bearings
・High load capacity
・Heat resistance
・High revolution capacity

The advantages of choosing plastic bearings
・Water, Chemical and Corrosion resistance
・Anti-static
・Easy to customize

Other than plastic bearings, we have been providing steel bearings as well.
However, special plastic bearings can be used in medical applications which even steel bearings can not used for, and typically plastic material has low electrical conductivity but using special plastic material, bearings come to be able to conduct electricity.

Using years of our experience we can provide you with customized bearings exclusively what you desire.

If you have been concerning about any issues, contact us today to discuss how we can help!

TOK Newsletter

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.

Written by Hatsune
Translated by Hiro

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Exclusive design for you

Even if there is not a product you expect in catalog, please contact us.
TOK can customize the size of products whatever you want.

For now we would like to introduce you one example with a past inquiry.

INQUIRY VIA WEBSITE (CUSTOMER)

- The customer is a toy manufacturer that is the most famous in the market
- They tried to produce a rotary damper in-house, but it did not work well.

REQUIREMENT

The size of damper must be very small.

TOK DESIGNING

- outer diameter: Φ6
- length: 15 mm
- torque value: 4 mN･m

This rotary damper has been used for the toy of Japanese Power Rangers.


Now we introduced the inquiry using rotary damper, however all of TOK products can be customized of course.

If you expect customized products, e.g. size, torque, behavior, material, color etc., please feel free to contact us.
We would be more than happy to design new product exclusively for you.

TOK Newsletter

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.

Written by Hatsune
Translated by Hiro

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Rotary viscous damper movement can be customized

TOK rotary dampers provide you gentle movement to get safety and luxury.
Typically the damping behavior of dampers moves at constant velocity,
however TOK can customize the behavior based on your requirement.

For example, at first it moves slowly, and then it moves quickly at final position.

Of course we can also customize and provide you other behavior whatever you want. The rotary dampers are allowed to control motions.

TOK rotary dampers are used fluid silicone oil to generate torque,
and for the customization of damping behavior we will change the inner design, due to this, the silicone oil flow will be changed and this works for tuning damping behavior.

Should you have any concerns/requirements, please contact us.
TOK is looking forward to assisting you soon.

TOK Newsletter

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.

Written by Hatsune
Translated by Hiro

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Health management excellent company 2019

TOK was certified as "Health management excellent company 2019" by the Nippon kenko kaigi.
The Nippon kenko kaigi is an organization which consists of economical party, medical party and insurers party etc., and which was established to extend a healthy lifespan and to enlighten appropriate health care.
It has been official recognition party by the government agency the METI(Ministry of Economy, Trade and Industry ).

The award is presented to company which places importance on workers' health and productivity.

[The criteria of certification]
・Medical Examination and Health Declaration inside and outside of company
・Placement of supervisor
・Measures of second-hand smoking   etc.

For more details, you can check the information through the following link.
https://www.meti.go.jp/english/press/2019/0221_002.html

TOK will all do our best for maintaining health management to provide pleasant workplace for employees.

Written by Hatsune
Translated by Hiro

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Award: "Outstanding technician and engineer"

Our company 3 employee were selected "Itabashi  outstanding technician and engineer" by Tokyo shoukou kaigisyo(The Tokyo Chamber of Commerce and Industry).


                                               

This is awarded system which community combined economic organization commend superior employee.
It is limited only Japan manufacture.


[Essential condition]

・Appropriate people of skill is better than other young skill person / technician.
・Appropriate were accredited as pattern in people work result, informal act and so on.

....and more.


This award is result of investing in personnel development.
We can take care of your request with our excellent member.

Written by Hatsune
Translated by Hiro

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Alternative product of Hysteresis Coupling

Hysteresis coupling(and magnet coupling)  is a mechanical product to transmit torque by using magnetic force.

For example, it would be used for packing machine and motor protect when over torque is loaded to.
However the hysteresis coupling might have disadvantage on cost-wise and dimension. 
Now we would like to introduce you our magnetic torque limiters. 

TOK’s magnetic torque limiters work as same as hysteresis coupling.

Usage applications are: 
●  Motor protection 
●   Robot arm 
●  Electric driver 
●  Tensioner for paper feeding machine(ex. ATM, Copy machine, Flim roller etc.) 

TOK’s torque limiters have been developed especially for monetary instruments and copy machines for more than 20 years.　
However you can consider to use our limiters for other applications. 

Now we recommend you magnetic torque limiter TLEU series. 

Specification overview: 

●   Outer diameter: φ22.5 
●   Bore diameter: φ10 
●  Max torque: 45mN・m 
●   Allowable revolution speed: 2,000 r.p.m (at the maximum) 


And we have TLES series.

Alternatively you can consider our torque limiters which provide you with compact space, light weight, cost-effective compared to hysteresis coupling.

We believe that our magnetic torque limiters would help you improve your productivity.
Please contact us!

TOK Newsletter

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.

Written by Hatsune
Translated by Hiro

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