62095
Figure 5
The linear actuator (1) provides motion to control rod (5)
controlling power takeoff connection and disconnection.
It is fixed to power takeoff through the bottom side (2),
screwing it on the power takeoff box.
Control rod motion is generated by a system composed of
electric motor and worm screw (7) which, being blocked in
rotation, linearly moves along two directions enabling to
connect and disconnect the PTO.
Axial power load is controlled by a spring, set inside actuator
(1), providing approx. 350 N force on power takeoff control
rod (5).
Operation
POWER TAKEOFF CONNECTION
PTO connection (Figure 5) is divided into two different
phases:
The first phase consists in moving forward worm screw (7),
rod (5) and sleeve (3), which, coming into contact with shaft
toothing (4), creates axial backstop of the rod and worm
screw in an intermediate position as to the whole stroke.
The axial backstop of worm screw (7) preloads the spring
inside the actuator and switches the electric motor off; the
pretensioned spring exerts energises control rod (5) and
keeps the axial load even after electric motor switching off.
The second phase consists in stroke continuation if sleeve (3)
toothing sustains a relative rotation as to the shaft (4)
toothing and therefore stops the axial backstop previously
set by the two toothing contrast.
Description
128
POWER TAKE OFF
D
AILY
Base - May 2004