Nexen 5H70PSP 914000 - Manual (Page 5)

5 FORM NO. L-20060-U-1209
InTrODuCTIOn
Nexen “5HP-SP” Single Position Tooth Clutches are
designed for applications where exact timing of two
components is required. When engaged, static air pressure
squeezes the teeth together (in the same position each time)
that lock in for absolutely no slippage or loss of torque.
Tooth clutches are normally engaged when stationary. In
certain circumstances, such as low RPM, tooth clutches
can be engaged at differential speed up to 150 RPM. The
allowable engagement speed is a function of the rotational
inertia of the mass being accelerated and the air pressure
applied.
If the tooth clutch is to be engaged in other than static
conditions, solve the following “Differential Speed” formula
to make sure the application’s differential speed is within
the limits of the selected tooth clutch.
DIFFERENTIAL SPEED FORMULA
Use the Differential Speed Formula to find the allowable
engagement speed (n) at a specific air pressure setting (P)
with a given inertial load (WK
2 ). This formula expresses the
relationship of the variables involved that effect the impact
of the face teeth during engagement. Tooth damage can
occur when tooth velocity and air pressure settings are too
high (i.e., a smaller clutch has a lower tooth velocity at any
given RPM, and a small clutch has less driver inertia).
V(10 4 )
N =
(P-22) WK 2
Where: n = Differential RPM Limit Clutch
V = Constant for Clutch (See Table 1)
P = Operational Pressure. PSI
WK
2 = Referred Inertia lb. • ft 2
eXaMPle: The required differential engagement speed
using a Model “5H45P-SP” clutch at 60 PSI is 150 RPM.
(Clutch rotating at 1250, machine component rotating at
1100). The referred inertial is 3 lb. • ft
2 . The differential
RPM limit for the clutch is:
1.4 (10 4 )
N = = 213 RPM
(60-22) 3
150 RPM is within the limit of the “5H45P-SP” operating
at 60 PSI with a load of 3 lb. • ft.
2 .
TaBle 1
COnSTanTS FOr CluTCHeS
H C T U L C T N A T S N O C H C T U L C T N A T S N O C
P S - P 0 3 H 5 0 1 . 2 P S - P 0 5 H 5 6 2 . 1
P S - P 5 3 H 5 0 8 . 1 P S - P 0 6 H 5 5 0 . 1
P S - P 0 4 H 5 7 5 . 1 P S - P 0 7 H 5 0 9 .
P S - P 5 4 H 5 0 4 . 1 P S - P 0 8 H 5 8 7 .
CAUTION
If differential speed exceeds the clutch
limitations, ratcheting of the teeth can
occur that will shorten clutch life.
NOTE: Formula does not estimate:
1 RPM that prevents ratcheting.
2 Acceleration time.
3 Tooth stress after engagement.
InSTallaTIOn
The “5HP-SP” Clutch has a drive flange with two bearings,
a pilot diameter, and tapped holes for mounting a pulley,
sprocket, or Nexen’s Flexible Coupling (See Table 2 for
recommended tightening torques).
nOTe: nexen recommends using a red anaerobic
thread locking compound on Pilot Mounting
Bolts.
Nexen’s Flexible Coupling combined with “5HP-SP” Tooth
Clutches provides high misalignment capabilities for in-line
shaft connections.
TaBle 2
Model Screw Size
metric [inch]
Tightening
Torque
5H30P-SP M6 [1/4-20] 17.6 Nm [13 ft.lb.]
5H35P-SP M6 [1/4-20] 17.6 Nm [13 ft.lb.]
5H40P-SP M6 [1/4-20] 17.6 Nm [13 ft.lb.]
5H45P-SP M6 [1/4-20] 17.6 Nm [13 ft.lb.]
5H50P-SP M8 [5/16-18] 36.6 Nm [27 ft.lb.]
5H60P-SP M8 [5/16-18] 36.6 Nm [27 ft.lb.]
5H70P-SP M10 [1/2-13] 161.3 Nm [119 ft.lb.]
5H80P-SP M12 [1/2-13] 161.3 Nm [119 ft.lb.]