Reference Information; Striking Operation; Idling-Proof Mechanism - Hitachi H 30PV Technical Data And Service Manual

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8. REFERENCE INFORMATION

Structure:

Second hammer

Cylinder

The rotation of the armature is transferred to the crank shaft and connecting rod, which in turn cause the piston to

reciprocate inside the cylinder. As the piston reciprocates, the changing air pressure inside the air chamber

between the piston and the striker causes the striker to continuously strike against the end of the second hammer.

At the same time, the air-cushion effect within the air chamber absorbs the impact of the second hammer. Should

the air escape from the air chamber, the air-cushion effect would cease, and the impact energy would not be

absorbed. Accordingly, the O-rings mounted on the striker and piston play an extremely important role in sealing

the air within the air chamber.

When the bull point is released from the concrete surface, the second hammer moves to the position illustrated in

Fig. 3, and the sleeve moves out of striking position. When this occurs, the air holes are opened and the pressure

within the air chamber remains unchanged even though the piston continues to reciprocate, thereby preventing

striking operation.

Striker

O-rings

Air chamber

Armature

Piston

Crank case cover

Connecting rod

Fig. 2

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Crank shaft

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