Installation and Operational Instructions for EAS
®
-compact
®
Ratchetting clutch, Type 49_._ _0._
Size 4
Synchronous clutch, Type 49_._ _5._
Size 4
(B.4.14.4.EN)
17/03/2021 TK/GC/NU
Chr. Mayr GmbH + Co. KG
Eichenstraße 1, D-87665 Mauerstetten, Germany
Phone: +49 8341 804-0, Fax: +49 8341 804-421
Page 13 of 22
Torque Adjustment
In order to guarantee low-wear clutch operation, it is essential that
the clutch torque is set to a sufficiently high service factor
(overload torque to operating torque).
Our experience has shown that an
adjustment factor of 1.5 to 3
gives good results.
On very high load alternations, high accelerations and irregular
operation, please set the adjustment factor higher.
Adjustment is carried out via dimension “a” by turning the set
screws (14) (Fig. 11).
The installed cup springs (9) are operated in the negative range
of the characteristic curve (see Fig. 10); this means that a
stronger pre-tensioning of the cup spring results in a decrease of
the spring force.
The torque is set manufacturer-side according to the customer's
request. If no particular torque adjustment is requested customer-
side, the clutch will always be
pre-set
and
marked
(calibrated)
manufacturer-side to approx. 70 % of the maximum torque.
Turning the set screws (14) clockwise causes a
reduction in torque. Turning them anti-
clockwise causes an increase in torque. You
should be facing the adjusting nut (4) as shown
in Fig. 11.
Even if the customer does not intend to change
the pre-set torque, the hexagon head screw
(13) must still be screwed out customer-side,
painted with Loctite 243 and screwed back in
again.
Fig. 10
Changing the Torque (Fig. 11)
The torque is changed exclusively via the set
screws (14) and not via the adjusting nut (4).
Loosen all hexagon nuts (15) (6 pieces).
Adjust all set screws (14) (6 pieces) evenly to the required
dimension “a” using a hexagon socket wrench.
Find dimension
“a” in the Adjustment Table (35) (Fig. 12)
(the Adjustment Table (35) is glued to the thrust washer (3),
see also Fig. 12).
Counter (secure) set screws (14) (6 pieces) again using
hexagon nuts (15).
Adjusting the adjusting nut (4) or distorting the
cup spring (9) outside of the cup spring
characteristic curve (see Fig. 10) stops the clutch
functioning.
The inspection dimension “a” (see Table 3) can
show deviations due to construction tolerances or to clutch
wear. After de-installing the clutch
(e.g. due to cup spring replacement or changes to the cup
spring layering), the clutch must be re-adjusted and calibrated
using dimension “a” and dimension “b” (see Adjustment Table
(35) Fig. 12, Table 3 and Fig. 11).
Fig. 11
Fig. 12 (Adjustment Table (35))
Move to operating
range
Graph of spring
characteristic
curve
Operating
range
Spring path S
F
orc
e F
Dim. “a”
Dim. “b”
Facing direction