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(8) Others
The Models WH 12DM/WR 12DM have the following features common to the previous models.
The thickness of the silver plating over the terminal is changed from 3
service life of the terminal. In addition, the terminal is movable according to the movement of the battery to
prevent damage to the contact portion. The contact between the housing and the battery is changed from
line contact to surface contact to minimize rattling due to wear.
To cope with the initial galling of the anvil, a hardened-steel metal with an oil groove for retaining grease
(C: powder-sintered, no groove) is provided at the tip and a dust-resistant seal is provided inside the metal
(the effect has already been proved by the Model WH 12DC2).
[Reference] Motor comparison of the Model WH 12DM with C is shown below. The Model WH 12DM is
equipped with a powerful motor having 1.4 times thicker winding, larger core diameter and stacking length
than C. In addition, the Model WH 12DM is equipped with the full-fledged fan having walls at both sides of
a blade for powerful cooling while C's fan is simple with only the blades.
HITACHI WH 12DM
114 g
Outside diameter of core: 30.5 mm
Stacking length of core: 17.0 mm
Diameter of winding: 0.85 mm
C
87 g
--- 9 ---
to 30
(10 times thicker) for longer
Outside diameter of core: 28.0 mm
Stacking length of core: 16.0 mm
Diameter of winding: 0.6 mm
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