Drilling machine

A drilling machine comprising:

• a motor housing having a driving motor a motor housing end cover detachably mounted with screws to the front of the motor housing, said motor housing end cover forms a rear machine unit;
• a gear box housing having a gear housing end cover detachably mounted with screws to the rear of the gear box housing, said gear housing end cover forms a front machine unit;
• a shaft driven by the motor and extending into the gear box housing;
• a drilling shaft extending through said gear box housing;
• a transmission in the gear box housing between said shaft driven by the motor and the drilling shaft, said transmission configured to rotate the drilling shaft at a desired rotation speed;
• wherein the rear machine unit and the front machine unit can be interconnected with said motor housing end cover and said gear housing end cover bear against each other;
• wherein the drilling machine can be split by separating the rear machine unit and the front machine unit from each other without disconnecting any of the motor housing end cover and the gear housing end cover from its respective housing;
• and
• wherein the drilling shaft extends through the entire gear box housing and forms part of the transmission, said drilling shaft having a diameter that decreases in steps from a front part in the gear box housing and wherein a rear section diameter of the rear section of the drilling shaft is smaller than the diameter of the drilling shaft extending through the transmission.

A drilling machine comprising:

• a motor housing having a driving motor a motor housing end cover detachably mounted with screws to the front of the motor housing, said motor housing end cover forms a rear machine unit;
• a gear box housing having a gear housing end cover detachably mounted with screws to the rear of the gear box housing, said gear housing end cover forms a front machine unit;
• a shaft driven by the motor and extending into the gear box housing;
• a drilling shaft extending through said gear box housing;
• a transmission in the gear box housing between said shaft driven by the motor and the drilling shaft, said transmission configured to rotate the drilling shaft at a desired rotation speed;
• wherein the rear machine unit and the front machine unit can be interconnected with said motor housing end cover and said gear housing end cover bear against each other;
• wherein the drilling machine can be split by separating the rear machine unit and the front machine unit from each other without disconnecting any of the motor housing end cover and the gear housing end cover from its respective housing;
• and
• wherein the motor housing end cover is dish-shaped on a side that faces away from the gear housing end cover, thereby defining a fan chamber.