Nexen 5H70P 917500 - Manual (Page 5)

5 FORM NO. L-20008-V-0511
Nexen 5H and 5HP Multiposition Tooth Clutches are
designed for applications requiring a high starting torque
with no slipping.
Tooth Clutches are normally engaged when stationary. In
certain circumstances, such as low RPM, Tooth Clutches
can be engaged at differential speeds 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 clutch selected.
Use the Differential Speed Formula to find the allowable
engagement speed (N) at a specific air pressure setting
(P) with a given inertia load (WK
2 ). This formula expresses
the relationship of the variables involved which 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).
Use the following formula:
V(10 4 )
N =
(P-22) WK 2
With: 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 5H45 Tooth Clutch at 60 psi is 150 RPM (Tooth
Clutch rotating at 1250, machine component rotating at
1100). The referred inertia is 3 Lb. Ft
2 . The differential
RPM limit for the clutch is:
150 RPM is within the limit of the 5H45 operating at 60
psi with a load of 3 Lb. Ft.
2 .
NOTE: The Differential Speed Formula does not estimate
RPM which prevents ratcheting, acceleration time, and
tooth stress after engagement.
INTRODUCTION
CAUTION
If differential speed exceeds tooth
clutch limitations, racheting of the
teeth can occur which will shorten
clutch life.
TABLE 1
CLUTCH CONSTANTS
CLUTCH
CONSTANT
(V)
CLUTCH
CONSTANT
(V)
5H30
5H30P
2.1
5H50
5H50P
1.26
5H35
5H35P
1.8
5H60
5H60P
1.05
5H40
5H40P
1.57
5H70
5H70P
0.90
5H45
5H45P
1.4
5H80P
5H100P
0.78
0.63
1.4 (10 4 )
N = = 213 RPM
(60-22) 3