Reducer Overrunning Clutch One Way Bearings 

Working Principle of a FXM120-50 Overrunning Clutch 

The Integrated Freewheel FXM is centered via the outer track F on the customer attachment part and bolted to this  The tolerance of the pilot diameter of the attachment part must be ISO h6 or h7.

The tolerance of the shaft must be ISO h6 or j6. For fitting to shaft ends, end covers can be supplied upon request .

A unidirectional Overrunning clutch, also known as a one-way bearing or backstop clutch, serves a pivotal function in diverse applications. Its fundamental role involves facilitating rotational motion exclusively in one direction, while concurrently inhibiting any motion in the opposite direction. This principle holds significant importance across various industries and scenarios where ensuring the unidirectional transmission of power is crucial. Incorporating a one-way backstop clutch empowers engineers and designers to attain efficient and reliable unidirectional power transmission, enhancing overall system performance.

Key Components

The fundamental working principle of a one-way overrunning clutch involves several key components:

1. Inner Race: The inner race is a cylindrical or annular component that is securely attached to a shaft or rotating element.

   
   

2. Outer Race: The outer race is another cylindrical or annular component that remains stationary or is attached to a stationary part of the machine.

   
   

3. Roller or Sprag: Between the inner and outer races are a series of roller or sprags. These elements are critical to the clutch's operation.

   
   

Technical Parameter of FXM120-50 Overrunning Clutch

FXM OVERRUNNING CLUTCH.pdf

Type	d					A	B	D	E	F	G	J	L	T	W	Z**	Weight
					mm
	mm	mm	mm	mm		mm	mm	mm	mm	mm		mm	mm	mm	mm		kg
FXM31-17	20*				20*	17	25	85	41	55	M6	31	24	70	21	6	0,8
FXM38-17	25*				25*	17	25	90	48	62	M6	38	24	75	21	6	0,9
FXM46-25	25				30	25	35	95	56	70	M6	46	35	82	21	6	1,3
FXM51-25	25	30	35		36	25	35	105	62	75	M6	51	35	90	21	6	1,7
FXM56-25	35				40	25	35	110	66	80	M6	56	35	96	21	8	1,8
FXM61-19	30	35	40		45*	19	27	120	74	85	M8	61	25	105	21	6	1,8
FXM66-25	35	40	45		48*	25	35	132	82	90	M8	66	35	115	23	8	2,8
FXM76-25	45	55			60*	25	35	140	92	100	M8	76	35	125	23	8	3,1
FXM86-25	40	45	50	60	70*	25	40	150	102	110	M8	86	40	132	23	8	4,2
FXM101-25	55	70			80*	25	50	175	117	125	M10	101	50	155	28	8	6,9
FXM85 -40	45	50	60	65	65	40	50	175	102	125	M10	85	60	155	28	8	7,4
FXM100 -40	45	50	55	60	80*	40	50	190	130	140	M10	100	60	165	35	12	8,8
FXM  120 -50	60	65	70	75	95	50	60	210	150	160	M10	120	70	185	35	12	12,7
FXM  140 -50	65	90	100	110	110	50	70	245	170	180	M12	140	70	218	35	12	19,8
FXM  170 -63	70	85	90	100	130	63	80	290	200	210	M16	170	80	258	38	12	33,0
FXM  200 -63	130				155	63	80	310	230	240	M16	200	80	278	42	12	32,0
FXM 240 - 63					185	63	80	400	280	310	M20	240	90	360	60	12	60,0
FXM 240 - 96					185	96	125	420	280	310	M24	240	120	370	60	16	95,0
FXM 260 - 63					205	63	80	430	300	330	M20	260	105	380	60	16	75,0
FXM 290 - 70					230	70	80	460	330	360	M20	290	105	410	60	16	90,0
FXM 290 - 96					230	96	110	460	330	360	M20	290	120	410	60	16	91,0
FXM310 - 70					240	70	125	497	360	380	M20	310	110	450	60	24	135,0
FXM310 - 96					240	96	125	497	360	380	M20	310	120	450	60	24	145,0
FXM 320 - 70					250	70	80	490	360	390	M24	320	105	440	68	16	105,0
FXM 360 - 100					280	100	120	540	400	430	M24	360	125	500	68	24	170,0
FXM 410 - 100					320	100	120	630	460	480	M24	410	125	560	68	24	245,0
FXM2410-100					320	200	220	630	460	480	M30	410	220	560	68	24	440,0

Overrunning Capability of FXM120-50 Overrunning Clutch

The sprag lift-off X is used for backstops and overrunning clutches, provided that in freewheeling operation the inner ring is rotating at high speed and providing withoverrunning clutches that the driving operation is conducted at low speed. In freewheeling operation, the centrifugal force FC causes the sprag to lift off from the outer track. In this operating state, the freewheel works wear-free, i.e. with unlimited service life.

The primary function of a one-way overrunning clutch is to allow overrunning in one direction while preventing it in the other. This behavior is achieved through the design of the roller or needle bearings:

1. Overrunning Direction: In the direction in which the clutch is intended to transmit power, the roller or needle bearings can roll freely between the inner and outer races. This allows the inner and outer races to rotate together with minimal friction.

   
   

2. Locking Direction: In the opposite direction, the roller or needle bearings become wedged or locked between the inner and outer races when subjected to torque. This prevents the inner race from rotating faster than the outer race, effectively blocking any reverse motion.

   
   

Applications of FXM120-50 Overrunning Clutch

FXM Overrunning clutches are versatile devices used in a wide range of applications where unidirectional power transmission is essential. Here are some common applications:

Conveyor Systems

FXM Overrunning clutches are used in conveyor systems to prevent backward motion when the conveyor needs to stop suddenly. This enhances safety and prevents product damage. It is widely used on conveyor system of Grain Silo Equipment.

Bucket Elevator

Overrunning clutches are employed in the freewheel mechanism. Backstop to Prevent Reversal of Inclined Conveyor and Vertical Bucket Elevators .

With the drive at one end of the drive pulley shaft, the backstop should be located at the opposite end, away from the speed reducer and coupling.

Industrial Equipment

Various industrial equipment, such as packaging machines, printing presses, and textile machinery, use one-way backstop clutches to prevent reverse rotation and safeguard against unintended backdriving.

Operating Instructions for FXM120-50 Overrunning Clutch

Proper operation and maintenance are crucial for ensuring the longevity and performance of one-way backstop clutches. Here are some operating instructions:

Installation

1. Ensure that the clutch is installed in the correct direction, allowing free rotation in the intended direction of power transmission.

   
   

2. Verify that the inner and outer races are properly aligned with the respective machine components.

   
   

3. Apply the recommended torque to secure the clutch in place, following the manufacturer's guidelines.

   
   

   
   

Lubrication

1. Use the recommended lubrication specified by the manufacturer. Insufficient or improper lubrication can lead to premature wear and failure.

   
   

2. Regularly check and maintain the lubrication to ensure that the clutch operates smoothly.

  3. At speeds in excess of the sprag lift-off speed, no special lubrication is required; the freewheel

functions maintenance-free. When operating below the sprag lift-off speed, an oil lubrication of the specified oil quality must be provided.

Inspection and Maintenance

1. Periodically inspect the clutch for signs of wear, damage, or contamination.

   
   

2. Follow the manufacturer's recommended maintenance schedule to replace or repair worn or damaged components.

   
   

Overloading

1. Avoid subjecting the clutch to torque loads beyond its specified capacity, as this can lead to damage or failure.

   
   

2. Ensure that the clutch is appropriately sized for the intended application to prevent overloading.

   
   

Conclusion

One-way backstop clutches are essential components in various mechanical systems where unidirectional power transmission is critical. They operate on the principle of allowing motion in one direction while preventing it in the other, making them invaluable in applications like conveyors, bicycles, ratchet mechanisms, and industrial equipment. Popular models from manufacturers offer different features to suit diverse needs. To ensure the optimal performance and longevity of these clutches, proper installation, lubrication, inspection, and maintenance are essential. By following operating instructions and best practices, users can maximize the reliability and efficiency of their one-way backstop clutches.

FAQ

1. Are you Trading Company or Manufacturer ?

SUMA is Manufacturer with one-stop service , Production history over 20 years, exporting experience up to 10 years  .

2. Can i have Samples to check quality first ?

It is okay to get backstop clutch sample for quality check .

3. How can i choose the correct backstop clutch i need ?

Torque capacity , Rotation Speed , and Dimensions are necessary to choose the right model.

If you not so sure about it, pls share with us, our engineer will give you professional guidance .

4. What Material of the bearings you are supplied ?

Standard Material : Outer Race : ST14, Needle Roller: GCr15 , Cage: PA66

5. How soon you can make the shipment ?

Usually all are in stock, can ship out within 2-3 days .

If big quantity, can ship out in 10 days .

Customized sizes may need 15-20 days , Depends on specific order.

6. Is there guarantee of items purchased ?

We produce 1 year warranty for all backstop clutch we sell.