Rammers present a special engineering challenge. The engine
must withstand both the vibration of the compactive force and the high
dirt and dust environment. Additionally, rammer engines require a high
degree of specialized design to integrate with the rest of the machine
for maximum performance.
The
rammer designs require that the entire machine be balanced on the
center of the foot in both the front to back axis and side to side axis.
Since the engine is mounted to the side of the leg of the rammer, the
lesser the width (W) of the engine the less the rammer needs to be
angled (A) forward to balance the machine over the foot. As the rammer
angle (A) is increased, the compaction force(F1) that impacts the
ground is reduced and the backward force (F2)increases – propelling the
rammer forward and reducing compactiveforce.
To
maximize the compaction force,
Subaru rammer engines are designed
specifically for rammer applications. All Subaru rammer engines are
balanced close to the mounting face and also are balancedon the side to
side axis for best compaction performance and easy operation.