Hitachi H45MRY, Технические данные и руководство по обслуживанию

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8-2. Dynamic Damper with Leaf Spring
The vibration caused by hammering operation of the
Model H 45MRY is transmitted to the cylinder crank
case, back cover, housing and finally to the weight
through the leaf spring supporting portion. Then the
weight moves in the reverse direction of the
transmitted vibration to negate the vibration of the
main body (Fig. 3).
Fig. 3
8-3. Vibration-proof Handle thanks to the Transatory Unit and the Neidhardt Spring
The Model H 45MRY has the vibration-proof handle equipped with the transatory unit and the Neidhardt spring.
Cylindrical rubbers
(handle damper: 4 pcs.)
Handle side
Handle damper
retaining material
(handle side)
Main body side
(b) At full-load
Cylindrical
convex
Vibration
proof rubbers
Slotted groove
Handle damper retaining material
(Cylinder crank case)
Pressing force
of the main
body
(a) At no-load
Rolled and compressed
Reaction
Fig. 4
Vibration of
the main body
Vibration of
the weight
Vibration of
the weight
Vibration of
the main body
Structure of the transatory unit
The main body (cylinder crank case) is connected to
the upper handle through four cylindrical rubbers
(handle dampers). These rubbers are rolled and
compressed on the inclined surface to absorb the
vibration. Since the transatory unit has nonlinear
spring characteristics, the spring constant is lower
than the conventional shearing type vibration-
proofing structure. Thus the Model H 45MRY can
provide high vibration-proofing effect with good
cushioning properties. The joint of the slotted groove
and the cylindrical convex is provided at the center to
prevent the handle from being pulled out by twisting
or pulling in hammering operation (Fig. 4).