hammer drill dh 30pc/dh 30pb

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hammer drill dh 30pc/dh 30pb | Manualzz

Retainer sleeve (A)

Retainer sleeve (B)

Second hammer

Striker

Cylinder

O-ring

Third gear

Key

Piston

Connecting rod

Crank shaft

Key rails

Needle

Steel ball

Air chamber

Second gear

Third pinion

Armature

Clutch (A)

First gear

(b) DH 30PB

Fig. 3

8-1. Rotational Transmission

The rotation of the armature is transmitted to the third pinion through the second gear and clutch (B) in the case of the Model DH 30PC. In the case of the Model DH 30PB, the rotation of the armature is transmitted to the third pinion through the second gear. Then the rotation is transmitted from the third pinion through the third gear and the key to turn the cylinder. The rotation of the cylinder is transmitted to retainer sleeve (B) through the steel ball of the slip clutch mechanism, and to retainer sleeve (A) through the needle of the idling-proof mechanism. The rotation of retainer sleeve (A), which is key-connected to the inserted drill bit by means of two key rails, is transmitted to the drill bit.

8-2. Striking Operation

The rotation of the armature is transmitted to the crank shaft through the first gear and clutch (A). Then the rotation is transmitted to 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.

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