Core drill
A core drill includes: a motor having a stator and a rotor, which is rotatable relative to the stator; a speed-reducing mechanism; an output shaft that, in the state in which a core bit is mounted thereon, is rotated by the rotational force of the rotor transmitted via the speed-reducing mechanism; and a battery-mounting part, on which a battery pack is mounted. A stator outer diameter, which is the outer diameter of a stator core of the stator, is 75 mm or more; and a stator length, which is the dimension of the stator core in an axial direction, is 30 mm or more.
1 . A core drill comprising:
a motor comprising a stator and a rotor, which is rotatable relative to the stator;
a speed-reducing mechanism;
an output shaft that, in the state in which a core bit is mounted thereon, is rotated by the rotational force of the rotor transmitted via the speed-reducing mechanism; and
at least a first battery-mounting part, on which a first battery pack is mountable;
wherein:
a stator outer diameter, which is the outer diameter of a stator core of the stator, is 75 mm or more;
a stator length, which is the dimension of the stator core in an axial direction, is 30 mm or more; and
the core bit has a hole-drilling diameter, which is the outer diameter of a tip portion of the core bit, that is 155 mm or more.
2 . The core drill according to claim 1 , wherein the stator outer diameter is 120 mm or less.
3 . The core drill according to claim 2 , wherein:
the stator length is 65 mm or less;
the speed-reducing mechanism has a speed-reduction ratio of 1/16 to 1/5;
the motor has a rated output of 1,800-3,000 W.
4 . The core drill according to claim 3 , further comprising:
a second battery-mounting part electrically connected in series to the first battery-mounting part, on which a second battery pack is mountable;
wherein each of the first and second battery packs has a rated voltage of 40 V or more.
5 . The core drill according to claim 1 , wherein the stator length is 65 mm or less.
6 . The core drill according to claim 1 , wherein the hole-drilling diameter is 200 mm or less.
7 . The core drill according to claim 1 , wherein the speed-reducing mechanism has a speed-reduction ratio of 1/16 or more and 1/5 or less.
8 . The core drill according to claim 1 , wherein the motor has a rated output of 1,800 W or more and 3,000 W or less.
9 . The core drill according to claim 1 , wherein the at least first battery pack has a rated voltage of 80 V or more.
10 . The core drill according to claim 1 , further comprising:
a second battery-mounting part electrically connected in series to the first battery-mounting part, on which a second battery pack is mountable;
wherein each of the first and second battery packs has a rated voltage of 40 V or more.
11 . A core drill comprising:
a motor comprising a stator and a rotor, which is rotatable relative to the stator;
a motor-housing part that houses the motor;
a speed-reducing mechanism disposed more forward than the stator;
an output shaft that, in the state in which a core bit is mounted thereon, is rotated by the rotational force of the rotor transmitted via the speed-reducing mechanism;
a grip part configured to be gripped by a user, the grip part being disposed more rearward than the motor-housing part;
a trigger lever configured to control operation of the motor, the trigger lever being disposed on the grip part;
a first battery-mounting part, on which a first battery pack is mountable; and
a second battery-mounting part, which is connected in series to the first battery-mounting part and on which a second battery pack is mountable;
wherein:
at least a portion of the output shaft is disposed more forward than the speed-reducing mechanism; and
the first battery-mounting part and the second battery-mounting part are disposed more forward than the trigger lever.
12 . The core drill according to claim 11 , wherein:
a battery-connection part is disposed on the lower side of the motor-housing part; and
the first battery-mounting part and the second battery-mounting part are disposed on the battery-connection part.
13 . The core drill according to claim 11 , wherein:
a battery-connection part is disposed on a lower side of the motor-housing part;
the first battery-mounting part is disposed on the battery-connection part; and
the second battery-mounting part is disposed in the motor-housing part.
14 . The core drill according to claim 13 , wherein the second battery-mounting part is disposed on an upper portion of the motor-housing part.
15 . The core drill according to claim 11 , wherein:
a battery-connection part is disposed on a lower side of the motor-housing part; and
the first battery-mounting part and the second battery-mounting part are both disposed on the motor-housing part.
16 . The core drill according to claim 15 , wherein:
the first battery-mounting part is disposed on a left portion of the motor-housing part; and
the second battery-mounting part is disposed on a right portion of the motor-housing part.
17 . The core drill according to claim 11 , wherein:
a controller is disposed more rearward than the motor and controls the motor;
a controller-housing part is disposed between the motor-housing part and the grip part, the controller-housing part housing the controller;
the first battery-mounting part is disposed on the controller-housing part; and
the second battery-mounting part is disposed on the motor-housing part.
18 . The core drill according to claim 11 , wherein each of the first battery pack and the second battery pack has a rated voltage of 40 V or more.
19 . The core drill according to claim 11 , wherein the second battery-mounting part is disposed on an upper portion of the motor-housing part.
20 . A core drill comprising:
a motor comprising a stator and a rotor, which is rotatable relative to the stator;
a speed-reducing mechanism;
an output shaft configured to be rotated by the rotational force of the rotor transmitted via the speed-reducing mechanism;
a core bit that is mountable on the output shaft, the core bit having a hole-drilling diameter, which is the outer diameter of a tip portion of the core bit, that is 155 mm or more; and
at least a first battery-mounting part, on which a first battery pack is mountable;
wherein:
a stator core of the stator has an outer diameter that is 75 mm or more; and
the stator core has a length in an axial direction that is 30 mm or more.