RSCI Series Backstop Clutch One Way Clutch for Conveyor

Reducer Overrunning Clutch One Way Bearings 

Working Principle of a RSCI Overrunning Clutch 

Type RSCI is a centrifugal lift off sprag type freewheel with the inner race rotating. 

Only the inner race is designed for freewheeling. Primarily designed as a backstop, this type can be alsoused as an overrunning clutch in crawl drives, where the overrunning speed is high but the driving speed is low and does not exceed the maximum driving speed shown in the table Centering of the outer race must use the inner bore.

The centering spigot must not contact the sprag cage.

RSCI Series Overrunning Clutch / One Way Bearing – Working Principle & Applications

Working Principle of RSCI Series Overrunning Clutch

The RSCI Series overrunning clutch, also known as a one-way bearing or backstop clutch, is designed to transmit torque in one direction while preventing rotation in the opposite direction. This functionality is essential in power transmission systems where controlled unidirectional motion is required.

RSCI freewheels are centered by the outer track and can be bolted directly to the customer’s mounting structure. Shaft tolerances should typically follow ISO h6 or j6, while the pilot diameter of the attachment part should meet ISO h6 or h7 requirements. End covers for shaft-end mounting can be supplied upon request.

By enabling rotation only in one direction, RSCI one-way clutches ensure reliable power transmission, protect equipment from reverse motion, and enhance overall operational safety.

---

Key Components of RSCI One-Way Clutch

The RSCI overrunning clutch consists of several critical components:

1. Inner Race

Firmly mounted to the shaft or rotating element, transmitting torque during locking operation.

2. Outer Race

Typically mounted to a stationary element or housing, providing support for the internal sprags or rollers.

3. Sprags / Rollers

The key locking elements. They allow free rotation in the overrunning direction and lock instantly when reverse torque is applied.

Technical Parameter of RSCI Overrunning Clutch

RSCI One Way Clutch.pdf

型号Type	尺寸Size	扭矩Torque	转速 Rotation Speeds			外形尺寸 Dimensions												重量  Weight
	dH7 [mm]	TKN1) [Nm]	nmax2) [min-1]	nimin3) [min-1]	nimax4) [min-1]	D5) [mm]	D1h6 [mm]	D2H7 [mm]	D3 [mm]	D4	z	L mm]	I [mm]	I1 [mm]	m [mm]	I2 [mm]	I3 [mm]	RSCI [kg]	F8 [kg]
RSCI	20	212	315	750	15000	90	36	66	78	M6	6	35	35	25	5	8	16	1.5	0.3
	25	319	300	725	14000	95	40	70	82	M6	6	35	35	25	5	8	16	1.6	0.4
	30	375	290	700	11000	100	45	75	87	M6	6	35	35	25	5	8	16	1.8	0.4
	35	550	280	670	11000	110	50	80	96	M6	8	35	35	25	5	8	16	2.1	0.5
	40	800	260	630	8000	125	60	90	108	M8	8	35	35	25	5	10	21	2.7	0.7
	45	912	255	610	7000	130	65	95	112	M8	8	35	35	25	5	10	21	2.9	0.9
	50	1400	235	560	6000	150	80	110	132	M8	8	40	40	25	7.5	10	21	4.3	1
	60	2350	210	510	6000	175	85	125	155	M10	8	60	50	36	12	12	35	6.5	1.8
	70	3050	195	470	4000	190	100	140	165	M10	12	60	50	36	12	12	35	8.6	1.9
	80	4500	180	440	4000	210	120	160	185	M10	12	70	60	36	17	12	35	12.5	2.6
	80M	5800	155	375	4000	210	120	160	185	M10	12	70	60	46	12	12	35	13.1	2.6
	90	5600	170	410	3000	230	140	180	206	M12	12	80	70	36	22	12	35	17.4	3
	90M	8700	145	350	3000	245	140	180	206	M12	12	80	70	46	17	12	35	18.3	3
	100	10500	145	355	3000	290	140	210	258	M16	12	90	80	52.6	18.6	15	37	28	5
	100M	16000	140	340	2400	290	170	210	258	M16	12	90	80	63	13.5	12	35	30	5
	130	15750	135	330	2400	322	170	240	278	M16	12	90	80	52.6	18.6	15	37	35	6

Overrunning Capability of RSCI Overrunning Clutch

RSCI Series – Technical Overview

Each model is engineered for:

• High torque capacity

• Backstop and overrunning duties

• Long service life

• Stable locking performance

• Reliable freewheeling at high speed

  
  

Full technical parameters can be provided in table or PDF format depending on customer needs.

---

Overrunning Capability of RSCI Overrunning Clutch

RSCI clutches are designed with sprag lift-off technology, which allows the sprags to disengage during high-speed freewheeling. When centrifugal force lifts the sprags off the outer track:

✔ Wear-free operation during freewheeling

✔ Unlimited service life at high speed

✔ Reduced friction and heat

In the power-transmitting direction, the sprags wedge between inner and outer races, creating positive torque transmission.

---

How RSCI One-Way Clutch Works

Overrunning Direction:

The sprags or rollers roll freely, allowing the inner and outer races to rotate independently with minimal friction.

Locking Direction:

Sprags wedge tightly and lock the inner and outer races together, preventing reverse rotation and ensuring safe torque transmission.

---

Applications of RSCI Series Overrunning Clutch

RSCI overrunning clutches are widely used in industries requiring unidirectional power transmission:

1. Conveyor Systems

Prevents belt conveyors from reversing during sudden shutdowns, improving safety and protecting materials.
Widely used in grain silos, bulk handling systems, and industrial conveyors.

2. Bucket Elevators

Acts as a backstop to prevent unintended reverse rotation of vertical or inclined bucket conveyors.

3. Industrial Machinery

Used in:

• Packaging equipment

• Printing machines

• Textile machinery

• Gearboxes & reducers

• Material handling systems

Prevents backdriving and ensures consistent power flow.

---

Operating Instructions for RSCI Overrunning Clutch

✔ Installation

• Install in correct rotational direction for freewheeling and locking.

• Ensure accurate alignment of inner and outer races.

• Apply the manufacturer-recommended mounting torque.

✔ Lubrication

• Follow lubrication guidelines strictly.

• At speeds above lift-off speed: no special lubrication needed (maintenance-free).

• At lower speeds: supply oil lubrication of recommended viscosity.

  
  

✔ Inspection & Maintenance

• Regularly inspect for wear, contamination, and misalignment.

• Replace worn components as needed.

• Avoid torque loads exceeding rated capacity.

---

Conclusion

The RSCI Series one-way overrunning clutch is a versatile and reliable solution for any application requiring unidirectional torque transmission. With its robust design, sprag lift-off technology, and wide model selection, RSCI clutches are ideal for conveyors, bucket elevators, reducers, packaging equipment, and industrial machinery. Proper installation and maintenance ensure long-lasting, stable performance.

---

FAQ – RSCI Series Overrunning Clutch

1. Are you a trading company or manufacturer?

SUMA is a professional manufacturer with over 20 years of production experience and more than 10 years of export history.

2. Can I get a sample to check quality?

Yes. RSCI backstop clutch samples are available for testing.

3. How do I choose the right RSCI model?

Key parameters:

• Required torque

• Rotation speed

• Shaft diameter / dimensions
  Our engineers can recommend suitable models.

4. What materials are used?

• Outer Race: ST14

• Needle Rollers: GCr15

• Cage: PA66

5. What is the delivery time?

• Regular models in stock: ship within 2–3 days

• Large quantities: 7–10 days

• Custom sizes: 15–20 days

6. Do you provide warranty?

All RSCI clutches include a 1-year warranty.