Service Training
BW 156/177 D-3/PD-3
- D 18 -
BW 178/179 D-3/PD-3
The motor consists of
•
the outer three-piece housing,
•
the flat distributor,
•
the cylinder block with the working pistons,
•
the output shaft and
•
the brake.
The motor housing consists of
•
the bearing section (drive shaft bearings),
•
the torque module (cam race) and
•
the oil distributor.
The flat distributor guides the pressure oil to the working pistons in the cylinder block. The working
pistons inside the cylinders are pressed with their rollers against the cam race of the torque module and
roll along the cam profile. This transforms the axial movement of the pistons to a radial movement of
the cylinder block. This rotary movement of the cylinder block is transferred via a splined connection to
the output shaft and from there to the drum.
The function of the radial piston motor is described hereunder. The piston positions mentioned in the
description are shown in the corresponding illustration.
The movement of a piston along the cam race must be examined during various phases of the rotation.
Summary of Contents for BW 156 D-3
Page 143: ...Service Training BW 156 177 D 3 PD 3 G 2 BW 178 179 D 3 PD 3 Supply Fig 1 Power supply...
Page 152: ...Service Training BW 156 177 D 3 PD 3 G 11 BW 178 179 D 3 PD 3 Brakes Fig 5 Brake...
Page 159: ...Service Training BW 156 177 D 3 PD 3 G 18 BW 178 179 D 3 PD 3 Vibration Fig 7 Vibration...
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