In standard deep groove ball bearings with steel balls, the combination of materials (steel/steel – high adhesion) enhances wear in the event of lubricant film breakdowns as a result of slippage, significantly reducing the life of the bearings.
In order to achieve a satisfactory bearing life even in the difficult operating conditions prevailing in the high-speed range, with a risk of slippage, hybrid deep groove ball bearings (rolling bearing steel rings, ceramic balls) are used.
To reduce the revolving masses (ball-cage assembly), only half the (even) number of balls is provided. This means that a higher load acts on each ceramic ball, reducing the risk of slippage.
Tribological properties of ceramic balls
• Ceramic balls are less negatively affected by lubricating film breakdowns and starved lubrication conditions than steel balls as the elements in rolling contact are significantly less susceptible to adhesive wear.
• The smaller mass of the ceramic balls results in slighter gravitational forces of the ball-cage assembly.
• In applications where there is a risk of passage of electric current, the ceramic balls act like insulators. • The modulus of elasticity of silicon nitride is ca. 1,5 times as high as that of rolling bearing steel.
As a result, ceramic balls have a smaller contact area. Less heat is generated in the bearings, and the grease life is extended.
CERAMIC BALLS
Ceramic hybrid bearings deliver advanced performance characteristics that can be transformational in machine tools. TKW offers silicon nitride (Si3N4) ceramic balls as a standard option for angular contact ball bearings to achieve ultra-high machining speeds, in addition to a considerable array of advantages:
› Higher rigidity and rotational accuracy, enabling high-accuracy machining
› Lower sliding friction in high-speed applications
› Lower heat generation
› Higher seizure resistance
› Longer grease life due to low heat generation.
What is Hybrid Bearings and Why Hybrid bearings?
Hybrid angular contact ball bearings (designation suffix HC) have rings made of bearing steel and rolling elements made of bearing grade silicon nitride (ceramic). As ceramic balls are lighter and have a higher modulus of elasticity and lower coefficient of thermal expansion than steel balls, hybrid bearings can provide the following advantages:
• higher degree of rigidity
• higher speed capability
• reduced centrifugal and inertial forces within the bearing
• minimized stress at the outer ring rolling contacts at high speeds
• reduced frictional heat • less energy consumption
• extended bearing and grease service life
• less prone to skid smearing damage and cage damage when subject to frequent rapid starts and stops
• less sensitive to temperature differences within the bearing
• more accurate preload/clearance control
Designation: F-HC808542.KL
Type: Hybrid deep groove ball bearings
Dimension: 190*240*24mm
Suffix of Hybrid Ball Bearings
HC: Ceramic rolling elements
Weight: 2.1kg
Application: Spreader Rolls
Elements: Ceramic Balls
In standard deep groove ball bearings with steel balls, the combination of materials (steel/steel – high adhesion) enhances wear in the event of lubricant film breakdowns as a result of slippage, significantly reducing the life of the bearings.
In order to achieve a satisfactory bearing life even in the difficult operating conditions prevailing in the high-speed range, with a risk of slippage, hybrid deep groove ball bearings (rolling bearing steel rings, ceramic balls) are used.
To reduce the revolving masses (ball-cage assembly), only half the (even) number of balls is provided. This means that a higher load acts on each ceramic ball, reducing the risk of slippage.
Tribological properties of ceramic balls
• Ceramic balls are less negatively affected by lubricating film breakdowns and starved lubrication conditions than steel balls as the elements in rolling contact are significantly less susceptible to adhesive wear.
• The smaller mass of the ceramic balls results in slighter gravitational forces of the ball-cage assembly.
• In applications where there is a risk of passage of electric current, the ceramic balls act like insulators. • The modulus of elasticity of silicon nitride is ca. 1,5 times as high as that of rolling bearing steel.
As a result, ceramic balls have a smaller contact area. Less heat is generated in the bearings, and the grease life is extended.
CERAMIC BALLS
Ceramic hybrid bearings deliver advanced performance characteristics that can be transformational in machine tools. TKW offers silicon nitride (Si3N4) ceramic balls as a standard option for angular contact ball bearings to achieve ultra-high machining speeds, in addition to a considerable array of advantages:
› Higher rigidity and rotational accuracy, enabling high-accuracy machining
› Lower sliding friction in high-speed applications
› Lower heat generation
› Higher seizure resistance
› Longer grease life due to low heat generation.
What is Hybrid Bearings and Why Hybrid bearings?
Hybrid angular contact ball bearings (designation suffix HC) have rings made of bearing steel and rolling elements made of bearing grade silicon nitride (ceramic). As ceramic balls are lighter and have a higher modulus of elasticity and lower coefficient of thermal expansion than steel balls, hybrid bearings can provide the following advantages:
• higher degree of rigidity
• higher speed capability
• reduced centrifugal and inertial forces within the bearing
• minimized stress at the outer ring rolling contacts at high speeds
• reduced frictional heat • less energy consumption
• extended bearing and grease service life
• less prone to skid smearing damage and cage damage when subject to frequent rapid starts and stops
• less sensitive to temperature differences within the bearing
