ROSTA tensioner unit with pulley idler

Brand :

MIKI PULLEY

Caution

Product Description

By installing an aluminum alloy roller on the ROSTA tensioner unit SE model, it can be used as a belt tensioner.

Drawing

[RSE]

*M: Filter condition "Screw size" M1: Filter condition "Screw size 2"

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

[SE]

ROSTA tensioner unit with pulley idler outline drawing 02

[Pulley idler RA]

ROSTA tensioner unit with pulley idler outline drawing 03

Product Specification

Part number	Load range F [N]	Maximum displacement S1 [mm]	Maximum displacement S2 [mm]	Compatible belt(s)	Maximum rotating speed [min-1]	Weight [kg]
RSE-11	0 to 96	40	30	A	8,000	0.25
RSE-15	0 to 135	50	40	B	8,000	0.60
RSE-18	0 to 350	50	40	B	8,000	0.80
RSE-27	0 to 810	65	50	C	6,000	2.15
RSE-38	0 to 1,500	88	70	-	5,000	4.75
RSE-45	0 to 2,650	113	90	-	4,500	8.30

*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

Clarify the belt size, the proper belt tension (required tension), and the belt deflection angle θ. Then, using the following simple selection graph, select the size at the intersection of either the belt size or proper tension and the belt deflection angle θ. In addition, the proper belt tension varies depending on the number of belts.

Specifications Table

[RSE]

Unit: mm

Part number	A	B	D	D1	G	H1	L1	L2	L3	M	M1
RSE-11	51 (-0.5 to +1)	20	35	30	5	80	35	8	8	M6 × 20	M8 x 45
RSE-15	64 (-0.5 to +1)	25	45	40	5	100	45	11	11	M8 x 25	M10 x 60
RSE-18	79 (-0.5 to +1.5)	30	58	40	7	100	45	13	9	M10 x 30	M10 x 60
RSE-27	108 (-0.5 to +2)	50	78	60	8	130	60	14	11	M12 x 40	M12 x 75
RSE-38	140 (-0.5 to +2)	60	95	80	10	175	90	18	17	M16 x 40	M20 x 100
RSE-45	200 (-0.5 to +2)	70	115	90	12	225	135	22	17	M20 x 50	M20 x 140

■ 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.

[Pulley idler RA]

Unit: mm

Part number	Applicable Tensioner	A	B	C	D	d	d1	E	L1	bearing
RA-11	RSE-11	13	7	9	30	8	12	3	35	608ZZ
RA-15/18	RSE-15/18	16	9	13	40	10	15	6	45	6200ZZ
RA-27	RSE-27	22	12	16	60	12	18	6	60	6301ZZ
RA-38	RSE-38	39	15	22	80	20	28	8	90	6304ZZ
RA-45	RSE-45	48	15	60	90	20	28	10	135	6304ZZ

*Combine with the Rosta tensioner SE model.
*Bolts and nuts for fixing the pulley idler are included as accessories.
*Material: aluminum alloy

Usage Example

Usage Examples

■ Idler Settings

ROSTA tensioner unit with pulley 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 pulley 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]
RSE-11	M6 × 20	10
RSE-15	M8 x 25	25
RSE-18	M10 x 30	49
RSE-27	M12 x 40	86
RSE-38	M16 x 40	210
RSE-45	M20 x 50	410

■ Idler Mounting Bolt

Part number	Bolt Nominal Diameter × Length	Proper Tightening Torque [N⋅m]
RSE-11	M8 x 45	20
RSE-15	M10 x 60, 55	20
RSE-18	M10 x 60, 55	20
RSE-27	M12 × 75,80	35
RSE-38	M20×100,100	160
RSE-45	M20 × 140,130	160

[Mounting]

ROSTA tensioner unit with pulley 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 pulley 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 pulley 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.

ROSTA tensioner unit with pulley 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.

ROSTA tensioner unit with pulley 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.