R Offset Gearbox
R Figure 021B
R 1EFF : 301-399, 1 27-54-00 Page 45
1 1 May 01/04
1 1
1CES 1
**ON A/C 301-399,
The offset gearbox has:
-
an actuator housing
-
an input housing
-a torque limiter.
The actuator housing is a machined casting which contains the rotary actuator and the torque limiter. The input housing is bolted to the actuator housing and seals the input side of the actuator. The input housing includes a bevel housing.
The bevel housing contains an input bevel gear. This engages with a bevel gear shaft that passes through the torque limiter to transmit the output drive to the flap drive system. An input gear is installed on the bevel gear shaft. The input gear engages with a double gear which moves two idler gears installed between the input gear and an input gear assembly. The input gear assembly engages with, and transmits the drive to, the input gear of the rotary actuator.
The input bevel gear is held by one ball bearing and one taper roller bearing. Two roller bearings hold the bevel gear shaft.
The actuator assembly (offset gearbox and rotary actuator) is lubricated with semi-fluid grease and is filled through a vent plug in the bevel housing.
**ON A/C 001-049, 051-061, 101-105, 201-203,
(2) Torque Limiter
(Ref. Fig. 021, 022)
R **ON A/C 062-099, 106-149, 151-199, 204-299, 301-399, 401-499,
(2) Torque Limiter - Track 1
R **ON A/C 062-099, 106-149, 151-199, 204-299, 401-499,
(Ref. Fig. 021A)
Torque Limiter Figure 022
R 1EFF : 1 1 1CES 001-049, 051-061, 101-105, 201-203, 1 111 27-54-00 Page 47 May 01/05
**ON A/C 301-399,
(Ref. Fig. 021B)
**ON A/C 001-049, 051-061, 101-105, 201-203,
The torque limiter has:
-
a ball ramp device
-
a friction disk pack spline-mounted to release too much torque through the gearbox casing into the aircraft structure
-
a spring disk pack that is set to a limit of a minimum of 120 % of the maximum torque for operation
-an indicator with a spring clip which usually stays in the retracted position.
The torque limiter is made to stop the transmission of too much torque into the output. It also makes sure that the indication of torque peaks, which momentarily engage and release the torque limiter, does not occur.
R **ON A/C 062-099, 106-149, 151-199, 204-299, 301-399, 401-499,
The torque limiter prevents a torque-overload if there is a malfunction in the flap drive system. The torque limiter has:
-a ball ramp device
-five earthed plates
-six friction discs
-two groups of six spring discs
-
a thrust cup
-
a lockout indicator.
The ball ramp device gives axial movement of the input gear when the input gear turns at a lower speed than the bevel gear shaft. The device is a coupling made by three balls. These are installed between the input gear and the bevel gear shaft in machined grooves (ramps).
The earthed plates and the friction discs are installed on the input gear. The spring discs and the thrust cup are installed on the bevel gear shaft.
The lockout indicator gives a visual indication that the torque limiter has operated. It has a lockout indicator arm and a plunger. These are operated by movement of the thrust cup.
**ON A/C 001-049, 051-061, 101-105, 201-203,
(a) Operation
The power input from the torque shaft turns the through shaft of the torque limiter. The power transmits to the reduction gears, then the rotary actuator, through the input gear. If the torque necessary at the input to the rotary actuator is more than the bevel-gear shaft supplies (so the input gear causes resistance):
-
the balls move up the ramp in the ball and ramp coupling
-
the input gear moves axially against the spring disks "A"
-
the movement of the input gear compresses the friction disks against the earthed plates in the friction disk pack
-
the compression of the friction disk pack causes the input gear to "lock-out"
-
the pressure on the spring disks "A" pushes the spring cup against the spring disks "B"
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