ROSTA Tensioner Unit with Sprocket Idler

Brand :

MIKI PULLEY

Caution

Product Description

By installing a sprocket on the Rosta tensioner unit SE model, it can be used as a chain tensioner.

Drawing

[NSE]

■ For details of the tensioner section, please refer to the SE model in the diagram below.

[SE]

ROSTA tensioner unit with sprocket idler drawing 02

[Sprocket Idler N]

ROSTA tensioner unit with sprocket idler drawing 03

Product Specification

Part number	Load range F [N]	Maximum displacement S1 [mm]	Maximum displacement S2 [mm]	Applicable chain	Weight [kg]
NSE-15-35S	0 to 135	50	40	35	0.55
NSE-15-35D	0 to 135	50	40	35	0.70
NSE-18-35S	0 to 350	50	40	35	0.75
NSE-18-35D				35	0.90
NSE-18-40S				40	0.83
NSE-18-40D				40	1.1
NSE-27-50S	0 to 810	65	50	50	2.1
NSE-27-50D				50	2.5
NSE-27-60S				60	2.2
NSE-27-60D				60	2.8
NSE-38-80S	0 to 1,500	88	70	80	4.5
NSE-38-80D	0 to 1,500	88	70	80	5.4
NSE-45-100S	0 to 2,650	113	90	100	7.5
NSE-45-100D				100	9.4
NSE-45-120S				120	8.5
NSE-45-120D				120	10.9

*The load range is for the normal position specification.
The load range for the hard position is approximately 1.25 times the load range for the normal position.

Design Confirmation Points

■ Selection

In the case of chain transmission, there is no need to apply excessive initial tension to the chain itself for meshing transmission with the sprocket. Therefore, a small tension just enough to take up the slack in the chain is sufficient for the chain tensioner.
Please select the size of the tensioner according to the chain size from the table below.
In this case, set the tensioner angle to 10–15°. For long chains, please take the weight of the chain itself into consideration.

Chain size	NSE size
35	NSE-15, NSE-18
40	NSE-18
50·60	NSE-27
80	NSE-38
100, 120	NSE-45

Specifications Table

[NSE]

Unit: mm

Part number	A	B	D	G	H1	L3	U	Y adjustment range	M	M2
NSE-15-35S	64 (-0.5 to +1)	25	45	5	100	7	9	19-41	M8 x 25	M10 x 55
NSE-15-35D	64 (-0.5 to +1)	25	45	5	100	7	9	24-37	M8 x 25	M10 x 55
NSE-18-35S	79 (-0.5 to +1.5)	30	58	7	100	7	24	35-54	M10 x 30	M10 x 55
NSE-18-35D								39-50
NSE-18-40S								35-54
NSE-18-40D								39-50
NSE-27-50S	108 (-0.5 to +2)	50	78	8	130	8	28	41-79	M12 x 40	M12 x 80
NSE-27-50D								47-73
NSE-27-60S								41-79
NSE-27-60D								47-73
NSE-38-80S	140 (-0.5 to +2)	60	95	10	175	13	40	60-97	M16 x 40	M20 x 100
NSE-38-80D	140 (-0.5 to +2)	60	95	10	175	13	40	67-90	M16 x 40	M20 x 100
NSE-45-100S	200 (-0.5 to +2)	70	115	12	225	13	70	90-155	M20 x 50	M20 x 130
NSE-45-100D								108-136
NSE-45-120S								90-155
NSE-45-120D								116-129

*The symbol S at the end of the size indicates a single row sprocket, and D indicates a double row sprocket.

■ For detailed tensioner dimensions, please refer to the SE model table below.

[SE]

Unit: mm

Part number	A	B	D	E	G	H1	H2	L	N	P	U	T	M
SE-11	51 (-0.5 to +1)	20	35	6	5	80	60	90	22	8	16.5	8.5	M6 × 20
SE-15 / SE-I-15	64 (-0.5 to +1)	25	45	8	5	100	80	112.5	30	8.5	20.8	10.5	M8 x 25
SE-18 / SE-I-18	79 (-0.5 to +1.5)	30	58	10.5	7	100	80	115	35	8.5	25.3	10.5	M10 x 30
SE-27 / SE-I-27	108 (-0.5 to +2)	50	78	15	8	130	100	155	52	10.5	34.3	12.5	M12 x 40
SE-38 / SE-I-40	140 (-0.5 to +2)	60 (70)	95 (100)	15	10	175	140	205	66 (70)	12.5 (12)	42.0 (41.5)	20.5	M16 x 40
SE-45	200 (-0.5 to +2)	70	115	18	12	225	180	260	80	12.5	52.0	20.5	M20 x 50

*The dimensions in parentheses for SE-38 and SE-I-40 refer to the dimensions of SE-I-40.

[Sprocket Idler N]

Unit: mm

Part number	Compatible tensioner	O.D	P.D	B	DH	d	d1	L	T	Number of teeth	bearing
N-15-35S	NSE-15-35S	66	60.89	9	-	10	30	-	4.4	20	6200ZZ
N-15-35S	NSE-18-35S				-			-	4.4
N-15-35D	NSE-15-35D				50			14.4	4.3
N-15-35D	NSE-18-35D				50			14.4	4.3
N-18-40S	NSE-18-40S	75	69.12	9	-	10	30	-	7.3	17	6200ZZ
N-18-40D	NSE-18-40D	75	69.12	9	54	10	30	21.5	7.1	17	6200ZZ
N-27-50S	NSE-27-50S	89	81.37	12	-	12	37	-	8.9	16	6301ZZ
N-27-50D	NSE-27-50D	89	81.37	12	63	12	37	26.8	8.7	16	6301ZZ
N-27-60S	NSE-27-60S	95	85.61	12	-	12	37	-	11.9	14	6301ZZ
N-27-60D	NSE-27-60D	95	85.61	12	64	12	37	34.5	11.7	14	6301ZZ
N-38-80S	NSE-38-80S	108	98.14	15	-	20	52	-	15.0	12	6304ZZ
N-38-80D	NSE-38-80D	108	98.14	15	69	20	52	43.9	14.6	12	6304ZZ
N-45-100S	NSE-45-100S	127	112.70	15	-	20	52	-	18.0	11	6304ZZ
N-45-100D	NSE-45-100D	127	112.70	15	76	20	52	53.4	17.6	11	6304ZZ
N-45-120S	NSE-45-120S	140	123.30	15	-	20	52	-	24.0	10	6304ZZ
N-45-120D	NSE-45-120D	140	123.30	15	78	20	52	68.9	23.5	10	6304ZZ

*Please use in combination with the Rosta tensioner SE model.
*Bolts and nuts for fixing the sprocket idler are included as accessories.
*The symbol S at the end of the size indicates a single row sprocket, and D indicates a double row sprocket.

Usage Example

Usage Examples

■ Idler Settings

ROSTA tensioner unit with sprocket idler usage method 01

Always set the idler on the slack side of the chain or belt before use. For forward and reverse rotation, set the idler on both sides before use.

Rosta tensioner unit with sprocket idler Usage Method 02

When applying tension from the outside of the chain or belt, set the idler on the small sprocket (pulley) side before use.
On the other hand, when applying tension from the inside, please set the idler on the side of the larger sprocket (pulley).

For chain tensioners, make sure that at least three teeth of the sprocket idler are engaged with the chain.
If excessive tension is applied to the chain or belt, the lifespan of the chain, belt, and bearing will be significantly reduced.
Please allow for appropriate slack during use. A setting angle of approximately 10 to 15° is provided as a reference.
When applying tension from the inside of the V-belt, please use a V-pulley idler. For timing belts, please use a timing idler.
Since the tensioner fixing bolts and idler fixing bolts use strength class 8.8, please tighten them to the tightening torque specified below.

■ Tensioner Fixing Bolt

Part number	Bolt Nominal Diameter × Length	Proper Tightening Torque [N⋅m]
NSE-15	M8 x 25	25
NSE-18	M10 x 30	49
NSE-27	M12 x 40	86
NSE-38	M16 x 40	210
NSE-45	M20 x 50	410

■ Idler Mounting Bolt

Part number	Bolt Nominal Diameter × Length	Proper Tightening Torque [N⋅m]
NSE-15	M10 x 60, 55	20
NSE-18	M10 x 60, 55	20
NSE-27	M12 × 75,80	35
NSE-38	M20×100,100	160
NSE-45	M20 × 140,130	160

[Mounting]

Rosta tensioner unit with sprocket idler Usage Method 03

Align the positioning notch on the flange part of the Rosta tensioner with the designated position as specified in the design. If you mark the support plate or other mounting surface for the Rosta tensioner in advance to correspond with this notch, mounting will be easier. Additionally, this notch can also be used as an anti-rotation feature.

Rosta tensioner unit with sprocket idler Usage Method 04

Attach the Rosta tensioner to the machine using the included tensioner mounting bolts. In this case, please check the strength of the machine mounting section and ensure that the mounting surface is flat. If the Rosta tensioner cannot be mounted directly to the machine, please use a bracket (WS/WD model).

Rosta tensioner unit with sprocket idler Usage Method 05

Hold the outer shell of the Rosta tensioner with a wrench, tighten the included tensioner fixing bolt, and secure the Rosta tensioner. When using the Rosta tensioner near its allowable angle, use a torque wrench and tighten to the specified torque.

Lost Motion Tensioner Unit with Sprocket Idler Usage Method 06

Attach the sprocket idler to the Rosta tensioner. First, securely fix the idler fixing bolt to the arm with the lock nut. Next, adjust the sprocket idler within the specified mounting range (catalog Y dimension), align it with the chain line, and then secure it with two nuts.

Lost Motion Tensioner Unit with Sprocket Idler Usage Method 07

Always set the idler on the inside of the arm when using. If you must set it on the outside of the arm, install it as close to the arm as possible. In this case, the allowable torsion angle is Max. ±15° or less.

*Rubber (NR) has insufficient resistance to oil and grease, so please avoid contact with these substances.

Product Feature Details

· Maintains proper belt tension and automatically absorbs chain slack, vibration, and shock
The basic structure consists of an arm pre-attached inside the Rosta suspension unit, with the outer shell in a flange type shape. Installation requires only a single center bolt, making it easy to maintain proper belt tension, absorb chain slack, and install components such as conveyor belt scrapers and pressure rollers.