We will start with the most precise part of roller skates, – bearings, and take you into the world of roller skating science!
As a key factor in determining the speed and function of roller skates, the quality and material of the bearing directly affect the experience of the skater. Next, the editor will introduce the roller skating bearing from shallow to deep from the three aspects of the basic structure, classification and parameter interpretation of the bearing, so that everyone can understand the bearing in more detail.
Bearing frame: dust cover, inner ring, steel ball, cage, outer ring
The dust cover is a circular cover that covers the inner ball of the roller bearing. As the name suggests, the function is to prevent foreign matter from entering the inside of the bearing.
The outer ring of the bearing, as the part of the bearing in direct contact with the wheel of the roller skate, mainly plays a supporting role and bears the direct pressure from the wheel.
Balls play the role of rolling and transmitting force. The size, quantity and quality of the balls determine the load force and running performance of the roller bearing.
The cage isolates and fixes the position of each ball, reduces the friction between the balls, makes the load between each ball the same and guides the normal operation of the ball as much as possible.
The inner ring, the part of the roller skating bearing in contact with the tool holder piercing nail, together with the outer ring form the ball track.
Roller bearing classification
In the current market, the most common types of bearings are carbon steel bearings, chrome gold bearings, titanium alloy bearings, white porcelain bearings, and black porcelain bearings. Due to different materials, the scope of application of various types of bearings is not the same.
Carbon Steel Bearings
Carbon steel bearings have low cost, but low hardness, poor wear resistance, and the shortest service life among common roller bearings.
Chrome Steel Bearings
The most common bearing in roller skates for women on the market has high hardness, strong wear resistance and excellent compression resistance. It is suitable for players who usually like flat flower braking.
Titanium alloy bearings
Top-of-the-line bearings for high-end FSK (freewheel skating) with high strength and excellent compression and wear resistance. Suitable for players who are keen on a variety of violent FSK moves and fancy braking.
Black Porcelain Bearings and White Porcelain Bearings
The friction between the two balls is extremely small, and both have the advantages of high speed, strong hardness, high temperature resistance, strong corrosion resistance, oil-free self-lubrication, etc. The only difference is that the hardness of white porcelain bearings is slightly lower than that of black porcelain, which is suitable for speed skating. Players, but not suitable for players with flat flower brakes.
Roller bearing parameters
Common parameters on roller bearings are: 608ZZ, 608RS, ABEC1 to 9, ILQ, etc. These parameters represent different meanings.
608 type bearings are commonly used bearings for roller skates, where 6 represents the 6 series deep groove ball bearing, 0 represents the size series of the bearing, and 8 is the size value of the bearing with an inner diameter of less than 10mm.
The dimensions of 608 bearings are:
The outer diameter is 22mm, the height is 7mm, the inner diameter is 8mm, there are 7 rolling balls, and the rolling ball diameter is 4mm.
ZZ and RS on the back of the 608 model, Z means that the bearing has a dust cover on one side, and ZZ has both sides. RS means seal ring, RS bearing is also called sealed bearing.
ABEC is a precision system of bearings, numbered from 1 to 9. The larger the value, the higher the density grade of the bearing, the smaller the clearance in the bearing, and the better the performance of the bearing.