LLG One-Way Bearing

Are you looking for the management process and technology of the world’s leading bearing manufacturer in China? LLG one-way bearings are just what you need.

Our LLG one-way bearing has the world standard and innovative level of low noise, high load, and long life. In addition, LLG one-way bearings are strengthen with nylon 66 cages, stamped steel plate brackets, and solid copper cages. If you are looking for durability, then LLG one-way bearings are for you.

In addition, LLG one-way bearings have good insulation properties, such as a composite inner ring or outer ring insulated bearings with oxidation coating and sturdy adhesion consistent coating.

LLG one-way bearings are high speed very fast, also suitable for durability, low maintenance, simple structure, and low cost, available in a variety of designs and sizes.

LLG one-way bearing accuracy grade is ABEC1, 2RS / ZZ type OPEN seal, vibration grade is Z1 Z2 Z3 Z4, clearance is C2 C0 C3 C4 C5. In addition, LLG one-way bearings have passed ISO9001: 2008 certification.

If you are interested with us, contact us now!

One-Way Bearing-The Ultimate FAQ Guide

As we all know that technology is advancing day-by-day, therefore, need for good quality bearings has also increased.

People are investing more in high operational machines to get more desired results and for the ease of their lives.

LLG Bearing has 20 years of experience in constructing high quality bearings and demand of LLG bearings is on hand.

Let me introduce you with one-way bearings.

• What Is a One-Way Bearing?

One-way bearing is a bearing which consist of a small radial piece height and is made of a drawn cup needle roller holders. Such bearings are also called as anti-reverse bearings. 

One-way bearings have closely-packed units which are lighter in weight and can be fixed on a rotating shaft. 

One-way bearings have the capability to pass on the high torque. 

One-way bearings are easy to install and need no maintenance and are more reliable and versatile. The sturdy unit increases its’ service life. 

One-way bearings can transfer turning force present between the rotating shaft as well as the case which is uni-direction and also allows free movement in the opposite direction. 

One-way bearing is of two types such as sprag type bearing and roller type bearing. 

One-way bearing is a kind of bearing which is supplied already greased that it requires no maintenance or a very little maintenance. 

 One-Way Bearing

Figure 1 One-Way Bearing

• How do you Measure One-Way Bearings?

You are in need of replacement and do not know which measurements to take?

One-way bearings are marked in the form of letters or digits to predict the measurement.

One-way bearings can be measured when you are given internal diameter, external diameter as well as the width. These values are represented in such a way:

ID = Inner side diameter

OD = Outer side diameter

W = Width of a bearing

 ID x OD x W

One-way bearings are measured in millimeter (mm) but can also be measured in inches (in.)

Following steps are used to measure one-way bearings.

Steps of Measurement

• Determine the inner diameter of a one way bearing by including the stapes of a caliper in the internal ring of this type of bearing. It must be fixed with the borders without tightening enough. 
• Determine the external diameter of a special type one-way bearing by placing it in the mandibles of the device to balance it in a good way and measure it along the scale plus to other outside border.
• Determine the width of a one-way bearing by placing it between the jaws of a caliper. Do not tight enough because in this way, exact width is not measured. 
• After these steps, bring a size chart to evaluate the serial number. 

 Measuring One-Way Bearing

• What Are the Applications of One-Way Bearings?

One-way bearings being precision bearings are widely used in many devices and machines. The applications are given as:

• One-way bearings are used in paper copier machines
• One-way bearings are used in fax-machines
• One-way bearings are used in paper-towel dispensers
• One-way bearings are used in two-speed boxed of gear
• One-way bearings are used in indexing drives of a rack
• One-ways are used in anti-reverse devices
• One-way bearings are used in converters
• One-way bearings are used in transcendental clutches
• One –way bearings are used in reels by fishers
• One-way clutch bearings are used in motorcycles
• One-way bearings are used in fan drives
• One-way bearings are used in conveyors
• One-way bearings are used in washing-machines
• One-way bearings are used in hydraulic systems
• One-way bearings are used in mining machines

• What Is the Method to select One-Way Bearing?

To select or inspect the one-way bearing, the external cup of the one-way clutch is drawn from the strip-steel. When the heat is provided, one-way bearing has the capability to go round away. 

Ensure that assembling of a clutch or bearing is properly fixed into the ring hole and the housing is made of proper thickness and size as assigned in the table paper of dimensions. 

Lock up should act rightly when the one-way clutch bearing is operated at low shaft and installed on a housing of high limit. 

• What Is the Design of One-Way Bearing?

One-way bearings are special quality high precision bearings which are used in devices that does not support reverse direction. The design features of one-way bearing are marked as:

• One-way bearing experience a torque which is transferred by rollers used in it opposite to the inside slope
• One-way bearing changes the free movement into lock up when a minute backlash occur
• It is either present in the form of clutch-only or assembled in the form of clutch bearing
• Clutch-only portion needs a radial force from outside to stick with shaft along with the housing.

• What Are the Ways to Stop One-Way Bearing?

One-way bearing is a kind of bearings which transmit the torque and allow a free movement that is unidirectional. There are three ways in which clutch of one-way bearing can be stopped. 

• Overrunning
• Backstopping
• Indexing

Overrunning

Overrunning in a one-way bearing occurs when more than one motor is used to operate the similar machine along with the same shaft. 

A prime mover is used in addition with the service drive at greater speed and capacity for normal operation.  The secondary drive is used t maintain the conveyor position. Overrunning one-way clutch permits the secondary drive to remain static at medium high speed usage of conveyor.

Backstopping

This stopping method is used to stop the conveyor which is loaded in an inclined form to run back when drive system is stopped immediately.

The external race of one-way sprag clutch bearing is fixed with the frame of a machine through arm of a torque. In this case, the internal race of one-way sprag bearing rotates in a free motion in the forward direction. 

Sprag clutch one-way bearing stop the machine to run backward when it tries to move in the reverse direction. 

Indexing

This type of movement is used to create precision in the drive system of one-way bearing. A connection is made between the prime mover and the race. The reverse motion is then altered into indexing motion on the external race of the one-way bearing. 

• Describe the Operating Zone in One-Way Bearing?

Whenever a high torque is provided to the race of the one-way bearing, the sprag is moved with the engagement curve. This engagement curve produces an equal force effect between the mating and the torque. This contact between them is referred as the operating zone of the one-way bearing. 

The angle made by the engagement curve is twisted between the internal and external hoop. The angle is constant in normal operating conditions. 

• What Is the Designation System of One-Way Bearing?

Are you confused which bearing to select? Make your decision based on the designation system which consists of almost three to five numbers to measure. 

Designation system for a one-way bearing is:

• The former number or the letter or both describes the type and variant of a bearing.
• The next two numbers describe the dimension series. First number determines the height while the other number recognizes the dimension of one-way bearing.
• The last two numbers recognizes the size code of one-way bearing. When the size code is multiplied with 5, it gives the diameter of a one-way bearing ring hole. 

• What Is the Function of One-way Bearing?

One-way bearing is functional tool which is sandwiched between the internal and external rings that are cylindrical and have the capacity to transmit torque in a single direction. 

One-way bearings are designed in a way so that they can transmit the torque in a single direction which is present in the middle of case as well as the shaft. By using a press-fit on housing, one-way bearing is easily mounted. 

One-way bearing has a sprag which permits the turning force to transmit from one speedway to another one. One-way bearings need three or six rollers which can bear heavy load to protect the motor. 

• What Is the Lubrication Method of One-Way Bearing?

Lubrication is important for the efficient working of one-way bearing. Supply the one-way bearing with a good quality lubricant and with an adequate amount to make sure the maximum working of one-way bearing.

If the lubrication is not given to one-way bearing and a lot of work is gained by it then it may result in wear.

Lubricant for the one-way bearing needs to be selected carefully because it determines the amount of friction produced by the sprag when comes in connection with the internal and external rings of the one-way bearing.

Lubricant supplied to the one-way bearing has a great effect on the transmission of torque. Lubrication provides a protective-film from wear.

In this case, a lubricant which has automatic transmission power is more reliable or a lithium-based grease or oil is applied. 

Avoid supplying one-way bearing a lubricant which is a combination of high-pressure additives because it results in degradation and affects the working of sprag. 

The one-way bearing can operate well at instantaneous temperature of 160⁰C and when a continuous temperature is applied, highest range is 120⁰C.

When the temperature given is suspected to increase the limit then cooling of a lubricant is necessary for best performance of a one-way bearing.

The lubricant added must be contaminants free and of good quality. 

Method of Lubrication

When the machines are running at faster speed then the possibility of a greater friction is present. Method of forced oil lubrication is used in one-way bearing. 

In forced oil lubrication, the forced oil is directed on the parts. Keep the level of oil above the middle of the one-way bearing during bath lubrication and keep the one-way bearing properly immersed in the lubricant. 

In forced oil lubrication method, oil is directed from the internal side of ring to diminish the wear on the raceways area of the internal ring. 

Oil intake of 2mm diameter is fixed on the internal raceways of hoop and is six in number. When continuous oil groove is not given then oil sump must be attached on the inner ring surface. In this way, amount of oil directed on the inner raceways of ring is ensured. 

Forced Oil Lubrication

• How to Mount One-Way Bearing?

Mounting of a one-way bearing must be careful to avoid any damage. One-way bearing is referred as a high-precision tool that must be free from foreign particles, there must be no contaminants marks on it. It should be corrosion-free. 

Proper handling of a one-way bearing is essential as any mistake in it may cause damage or deformation of a cage. Mount the one-way bearing in such a way that engagement and direction of a drag must be in correct form. 

Avoid forceful pressing of a one-way bearing. It causes damage and deformation of a cage, drag clips as well as the sprag.

Internal ring or a shaft must be rotated in a freewheel direction to support easy installing.

When mounting one-way bearing, outer ring must not twist and do not hammer the outer ring directly. When a press-fit is applied then jig must be placed in contact with the external ring sides carefully without any failure. 

• Name the Series of One-Way Bearing and their Operating Temperature?

Some of the common series of one-way bearings are:

• CSK series

The operating temperature range for this series is -6⁰C-60⁰C. 

• RCB and HFL series

The operating temperature for this series ranges from 90⁰C for a plastic ring and 120⁰C for a stainless steel ring. HFL series can bear radial load because of rolling bearing. Housing made of aluminum is best for HFL series.

• RC and HF series

The operating temperature of this series ranges from 90⁰C for plastic ring to 120⁰C for stainless steel ring.

• What Is the Optimum Temperature for Working of One-Way Bearing?

-30⁰C to 120⁰C temperature is suitable for the energetic working of one-way bearing in normal conditions. 

When the temperature of surrounding is increased to 70⁰C then the oil lubrication of one-way bearing becomes necessary to avoid any wear or friction.

 Lubricant is also required above this temperature for the effective torque transmission otherwise rising temperature may cause damage or deformation of the sprags. 

• Describe the Types of One-Way Bearings?

One-way bearings are the high precision bearings and transmit torque from one race to another race ring. 

There are two types of one-way bearings:

• Sprag Clutch Bearing
• Roller Clutch Bearing

Sprag Clutch Bearing

Sprag clutch bearing is a type of one-way bearing which consist of two races such as internal race and external race and these races are similar to ball bearings. The cage of sprag clutch bearing is extended to a little extent and brake or stop mechanism is done in this area. 

Sprag is attached with the retainer of a one-way bearing with a rod and the length of the internal race including the sprag is such that the sprag will only touch the internal race and do not put any force when placed in such position. 

A spring is needed to rotate the sprag at some angle and rotate in a forward direction. Reverse direction of the inside race is prevented and the bearing eventually stops. 

Sprag type one-way bearings cost expensive.

Sprag Clutch One-Way Bearing

Roller Clutch Bearing

Roller clutch bearing is a type of one-way bearing which is a simple and rigid clutch and this roller clutch bearing have the capability to bear high torque. Such bearings consist of rollers behind the ramps.

They rotate in a single direction and rollers spin freely. Opposite direction is locked when the raceways move in a reverse direction. 

The specification of a roller clutch bearings is special style spring which keeps the roller pushed into some certain position. 

The rollers of one-way roller clutch bearings are always in contact with the cylindrical external race and the round internal race. 

One-way roller clutch bearings also assist radial forces. Roller clutch bearings transmit a torque in one way and moves freely in another way. 

Roller clutch one-way bearings are economical and are in more compact form than ball bearings. 

Roller clutch one-way bearings can withstand shocks and loads.

Roller Clutch One-Way Bearing

• What Are the Failures of One-Way Bearings?

One-way bearings suffer rub down or peel off of surfaces. The failures which one-way bearings encounter are:

Popping

This is a method in which the sprag slips on the internal ring surfaces during interaction and rush towards the freewheeling side. 

Severe popping may results in clinging of sprags in the cage.

Rolling over 

This is a process in which the sprags drop behind the interaction in the reverse direction when a high torque is applied. 

This rolling over of one-way bearing causes brinelling because excessive load is given to the internal and external rings. 

• What do you know about Bearing Life of One-Way Bearing?

L10 is the bearing life of one-way bearing which is the time in which a one-way bearing operate and fulfill its functions for which it is made. 

Bearing life is expressed as the number of rotations covered and number taken at a given speed and force before the fatigue occurs.

One-way bearing must be placed in corrosion free environment and need to be cleaned from dirt. This factor increases the lifespan of a bearing.

Factors Affecting One-Way Bearing Life

• Contamination
• Lubricant
• Temperature
• Handling
• Forces applied
• Fits
• Lack of locking
• Chattering 

The bearing life of a one-way bearing is shown by:

• L10 ( basic rating life)
• Cr ( radial load rating)
• Pr (active radial load)

• What Are the Solutions for Failure of One-Way Bearing?

Failures of one-way bearing decrease the life limit or affect the working ability of one-way bearing. Thus, solutions for the effective working of such bearings are:

Damage roller or spring of one-way bearing causes back-lash and the cure is to clean the one-way bearing properly for effective working and to remove such failure. 

When the rollers of one-way bearing indulge in slipping, they must be replaced with some new bearing rollers.

Inspect the retainer fixation with the cage so that chattering failure must be removed. 

Contamination or too much friction failure must be removed by placing new one-way bearing or changing the lubricant for energetic working. 

Lack of locking can be cured by adding appropriate amount of grease or oil and by inspecting the proper cage fitting.

• How do you know that One-Way Bearing Is Bad?

The reason through which you can encounter that one-way bearing is bad is as follow:

When it is gone bad, one-way bearing will move forward hardly and will glide when it is stopped. The loop of one-way bearing will produces noise even when it is not moving. 

The loop of the one-way bearing will overheat and produces a foul smell when gone bad. In this case, it needs to be replaced. 

Sign of Bad One-Way Bearing

• What Is the Structure of One-Way Bearing?

This bearing is a type of bearing which has an internal and external ring, a wedge and a retaining spring. When an external ring rotates counterclockwise relative to internal ring , the wedge experience a tilt or a slight movement at an angle. 

There is a suitable distance between the internal and external raceways rings to prevent locking of the bearing. When the external ring rotates freely in a clockwise direction then the sprag clutch is unable to move between both the raceways rings and lock is implemented. 

A spring is used to allow or support the inclined angle movement of sprag which is fixed with some retainer. 

Structure of One-Way Bearing

• Discuss the Types of Sprags in One-Way Bearing?

A sprag is a mechanical component which is fixed with the retainer of the race ring and makes an inclined angle with the races. 

There are two types of sprags:

• Engaged 
• Disengaged 

Engage Sprag of One-Way Bearing

In this engaged type, the contact of force with the sprag and inside ring becomes greater based on the centrifugal force.

In this, the drag torque elevates with the increase in the rotational speed of the outside ring.

Disengaged Sprag of One-Way Bearing

In this disengaged type, the contacting force with the sprag and the inside ring decreases based on the centrifugal force.  In this type, the drag torque on the outside ring is diminished with the rise in spinning speed.