Hitachi WH 12DM2, Технические данные и руководство по обслуживанию

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(4) Comparison of hammer and number of strokes
Thanks to the larger hammer (higher hammer inertia J) than the previous model, the number of strokes (N) of
the Model WR 12DM2 is increased. When compared with C2, the hammer size is smaller but the number of
stokes is higher. Therefore the tightening torque is equivalent to C2. As a guide, striking force is proportional
for J X N 2 . Therefore, when the J X N 2 of the Model WR 12DM is 100, the J X N 2 of the Model WR 12DM2 is
about 1.1 times larger than the Model WR 12DM and it is equivalent to or more than C2 as shown in the table
below.
WR 12DM2 C2 WR 12DM
Model Unit
V
Outside diameter of hammer (D)
mm
Height of hammer (H)
mm
Voltage
kgmm
2
%
WR 12DM2
12
44
18.6
38.4
3240
WR 12DM
12
42.6
20
37.4
3140
C1
12
42
16.5
31.7
3070
80 100
110
Hammer inertia J
Number of strokes (N)
J x N 2
No. of
strokes/min.
P
12
44.2
18.6
39.7
3120
105
C2
14.4
42
22
42.3
2920
100
C1 P
The 10% higher power motor and the larger hammer are the main factors that increase the tightening torque
of the Model WR 12DM2 substantially. Comparison of hammer and number of strokes is shown below.