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technical data Mechanical protector

Torque Limiter TL available

Torque setting

The slip torque of Torque Limiter is set by tightening or adjusting the adjustment nut or bolt.

(1) After installing Torque Limiter on the machine, perform several test runs, starting with a loosely tightened adjusting nut or adjusting bolt and gradually increasing the tightening amount to find the optimal tightening position. You can also use the tightening amount-torque correlation diagram (table below) to read the slip torque value for a given tightening amount of the adjusting nut or adjusting bolt. However, the torque for a given tightening amount will vary depending on the condition of the friction surface and other factors. The graph is only a guide; the most practical method is to perform a test run with a slightly looser tightening amount and find the tightening amount that is appropriate for the machine. If slip torque stability is particularly important, fully tighten the adjusting nut or bolt by hand, then further tighten it with a 60-degree wrench and allow it to slip approximately 500 revolutions to break in the friction surface. If the rotation speed is high, allow it to slip 500 revolutions in several steps.
(2) We can also deliver the product with the center member already installed and set to the specified torque. In this case, the shaft hole must be pre-machined.

Tightening amount-torque correlation diagram

The 0 point is when the adjusting nut or adjusting bolt is tightened by hand to fix the disc spring.

[Click to enlarge]

Selection and production of center members

A sprocket gear can be clamped into Torque Limiter as a center member.

If you are selecting and manufacturing these center members yourself, please note the following points.

(1) Please note that the minimum diameter of the center member is limited by Torque Limiter outer diameter (D).
For the minimum number of teeth when using sprockets for chain transmission, refer to the center member sprocket table below.
(2) The friction surfaces (both sides) of the center member should be finished to 3S to 6S.
(3) The center member hole diameter should be finished to 3S to 6S according to the dimensional tolerance of the center member hole diameter in the dimension table.
(4) The thickness of the part where the center member is clamped must be within dimension S in the dimension table.

Torque Limiter operation detection

Torque Limiter slips in the event of an overload to protect the machine, but if the drive source is not stopped, Torque Limiter will continue to slip.Continued slippage can cause abnormal wear or overheating of the friction plate, so the drive source must be stopped immediately.

As an example of how to detect slippage of Torque Limiter and stop the drive source, the following method using a proximity switch and digital tachometer is introduced.

Installation example

Format 1
When an overload is applied to the driven machine and the center member of Torque Limiter stops

Format 2
When the driven machine is overloaded and Torque Limiter stops

Format 3
When using Torque Limiter as a coupling type and the center member stops when overloaded

format 4
When using Torque Limiter as a coupling type and the main unit stops when overloaded

Avoid mounting method type 4 as much as possible because it is difficult to mount special cams. When using a Torque Limiter with a coupling type, use type 3.

By selecting the number of special cams as shown in the table below, slippage can be detected in approximately 1 to 10 seconds at the detection rotation speed.

Number of special cams and detection rotation speed

Note) Even in the case of 0.6 r/min or less, the range excludes 6 to 60 r/min depending on the number of special cams.
Number of special cams	Detectable rotation speed range r/min
1	6～60
2	3～30
3	2～20
4	1.5～15
5	1.2～12
6	1.0～10
7	0.85～8.5
8	0.75～7.5
9	0.67～6.7
10	0.6～6.0

Reference connection diagram

PB1: Motor operation push button
PB2: Motor stop push button
RST: BZ, L Reset push button
MC: Electromagnetic contactor for motor
R: Auxiliary relay
NO: Digital tachometer output a contact
BZ: Buzzer
L: Lamp

Digital tachometer: Omron H7CX-R11-N

Proximity switch: Omron Corporation TL-N5ME2

Note: We recommend the above Omron digital tachometers and proximity switches.
For details, please refer to the catalog published by Omron Corporation.

Special cam dimensions and installation

The special cam is screwed onto the driven side.

Use a screw lock or similar to prevent loosening.

Special cam reference diagram

*Please prepare this yourself.

Center member sprocket

When using a sprocket as a center member, please note the following:

The table below shows the case where a sprocket is used as the center member and chain power is transmitted.

(1) When using mounting types 1 and 2, the minimum number of teeth that the chain will not hit the special cam (as shown in the reference diagram)
(2) The minimum number of teeth that prevents the chain from hitting the friction plate when using Torque Limiter alone
(3) Bush length
(4) Sprocket hole diameter (center member hole diameter)

When using Torque Limiter alone and the special cam as shown in the reference diagram above in mounting type 2
Model number	sprocket Hole Diameter (Center Member hole diameter)	Minimum number of teeth on sprockets used
		RS35		RS40		RS50		RS60		RS80		RS100		RS120		RS140		RS160
		minimum Number of teeth	Bush length	minimum Number of teeth	Bush length	minimum Number of teeth	Bush length	minimum Number of teeth	Bush length	minimum Number of teeth	Bush length	minimum Number of teeth	Bush length	minimum Number of teeth	Bush length	minimum Number of teeth	Bush length	minimum Number of teeth	Bush length
TL200	30^+0.03 0	△20	3.8	16	6	-	-	-	-	-	-	-	-	-	-	-	-	-	-
TL250	41^+0.05 0	-	-	20	6.5	17	6.5	-	-	-	-	-	-	-	-	-	-	-	-
TL350	49^+0.05 0	-	-	26	6.5	21	6.5	18	9.5	15	9.5	-	-	-	-	-	-	-	-
TL500	74^+0.05 0	-	-	-	-	△29 (30)	6.5	25	9.5	19	9.5	-	-	-	-	-	-	-	-
TL700	105^{+0.05 0}	-	-	-	-	-	-	△33 (35)	9.5	26	12.5	21	12.5	18	12.5	-	-	-	-
TL10	135^{+0.07 0}	-	-	-	-	-	-	-	-	-	-	△29 (30)	12.5	24	15.5	△22	19.5	-	-
TL14	183^{+0.07 0}	-	-	-	-	-	-	-	-	-	-	△39 (40)	15.5	△33 (35)	15.5	△29	19.5	△26	23.5
TL20	226^{+0.07 0}	-	-	-	-	-	-	-	-	-	-	△54	15.5	△46 (60)	15.5	△40	19.5	△35	23.5

Notes: 1. △ marks are not standard A-type sprockets. If using a standard stock sprocket, please use the number of teeth in parentheses.
Note) 2. The bushing length is for reference only.

When using the special cam as shown in the reference diagram above with mounting type 1
Model number	sprocket Hole Diameter (Center Member hole diameter)	Minimum number of teeth on sprockets used
		RS35		RS40		RS50		RS60		RS80		RS100		RS120		RS140		RS160
		minimum Number of teeth	Bush length	minimum Number of teeth	Bush length	minimum Number of teeth	Bush length	minimum Number of teeth	Bush length	minimum Number of teeth	Bush length	minimum Number of teeth	Bush length	minimum Number of teeth	Bush length	minimum Number of teeth	Bush length	minimum Number of teeth	Bush length
TL200	30^+0.03 0	△25	3.8	19	6	-	-	-	-	-	-	-	-	-	-	-	-	-	-
TL250	41^+0.05 0	-	-	24	6.5	20	6.5	-	-	-	-	-	-	-	-	-	-	-	-
TL350	49^+0.05 0	-	-	30	6.5	24	6.5	21	9.5	17	9.5	-	-	-	-	-	-	-	-
TL500	74^+0.05 0	-	-	-	-	32	6.5	△28 (30)	9.5	21	9.5	-	-	-	-	-	-	-	-
TL700	105^{+0.05 0}	-	-	-	-	-	-	36	9.5	△28 (30)	9.5	△23 (24)	12.5	20	12.5	-	-	-	-
TL10	135^{+0.07 0}	-	-	-	-	-	-	-	-	-	-	△31 (32)	12.5	26	15.5	△23	19.5	-	-
TL14	183^{+0.07 0}	-	-	-	-	-	-	-	-	-	-	△41 (45)	15.5	35	15.5	△30	19.5	△27	23.5
TL20	226^{+0.07 0}	-	-	-	-	-	-	-	-	-	-	△56 (60)	15.5	△47 (60)	15.5	△41	19.5	△36	23.5

Notes: 1. △ marks are not standard A-type sprockets. If using a standard stock sprocket, please use the number of teeth in parentheses.
Note) 2. The bushing length is for reference only.

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