Power tool

1. A power tool comprising:

a motor having a rotary shaft extending in a front-rear direction;

a motor housing that houses the motor;

a head housing composed of resin and held forward of the motor housing by at least one threaded fastener inserted from a front side of the head housing into the motor housing;

an output shaft protruding downward from the head housing and extending perpendicular to the at least one threaded fastener;

a front bearing rotatably supporting a front portion of the rotary shaft of the motor and being held by the head housing;

an upper bearing rotatably supporting an upper portion of the output shaft and being held by the head housing; and

a lower bearing rotatably supporting a lower portion of the output shaft and being held by the head housing;

wherein:

the head housing has a divided structure comprising an upper half and a lower half, such that a lower-head housing case is joined to an upper-head housing cover, and

a dividing plane c between the upper and lower halves is located upward of a rotational axis line a of the motor.

2. The power tool according to claim 1 , wherein:

a rib is formed on the upper-head housing cover and mates with the lower-head housing case;

an outer ring of the lower bearing is held by the lower-head housing case; and

a tip of the rib presses against the outer ring of the lower bearing.

3. The power tool according to claim 2 , wherein the motor housing has a two-halved structure in which half housings are joined.

4. The power tool according to claim 3 , wherein the rotational axis line a of the motor is perpendicular to a pivot axis line of the output shaft.

5. The power tool according to claim 4 , further comprising:

an eccentric bearing and a lever configured to convert rotational motion of a rotary shaft of the motor into oscillating pivoting movement of the output shaft.

6. The power tool according to claim 1 , wherein the motor housing has a two-halved structure in which half housings are joined.

7. The power tool according to claim 1 , wherein the rotational axis line a of the motor is perpendicular to a pivot axis line of the output shaft.

8. The power tool according to claim 1 , further comprising:

an eccentric bearing and a lever configured to convert rotational motion of a rotary shaft of the motor into oscillating pivoting movement of the output shaft.

9. The power tool according to claim 1 , wherein the front bearing and the lower bearing are each held in the lower-head housing case and the upper bearing is held within the upper-head housing cover.

10. The power tool according to claim 1 , wherein the dividing plane c intersects the front bearing.

11. The power tool according to claim 10 , wherein the front bearing and the lower bearing are each held in the lower-head housing case and the upper bearing is held within the upper-head housing cover.

12. A power tool comprising:

a motor extending in a front-rear direction;

a motor housing that houses the motor;

a head housing held forward of the motor housing; and

an output shaft protruding downward from the head housing;

wherein:

the head housing has a divided structure that includes an upper-head housing and a lower-head housing,

the upper-head housing is fastened to the lower-head housing by at least one threaded fastener that extends through at least a portion of the lower-head housing and into the upper-head housing such that a head of the at least one threaded fastener is seated on or in the lower-head housing;

a dividing plane c between the upper-head housing and the lower-head housing is located upward of a rotational axis line a of the motor;

a rib is formed on the upper-head housing and mates with the lower-head housing;

a tip side of the output shaft is rotatably supported by the lower-head housing via a bearing;

an outer ring of the bearing is held by the lower-head housing; and

a tip of the rib presses against the outer ring of the bearing.

13. The power tool according to claim 12 , wherein the motor housing has a two-halved structure in which half housings are joined.

14. A power tool comprising:

a motor having a rotary shaft extending in a front-rear direction;

a motor housing that houses the motor;

a head housing including an upper-head housing connected with a lower-head housing;

an output shaft protruding downward from the lower-head housing;

a front bearing rotatably supporting a front portion of the rotary shaft of the motor and disposed within the lower-head housing;

an upper bearing rotatably supporting an upper portion of the output shaft and being disposed within the upper-head housing; and

a lower bearing rotatably supporting a lower portion of the output shaft and being disposed within the lower-head housing;

wherein:

the lower-head housing has an inner circumferential surface forming a cylindrical bore and

the upper-head housing has a circular-cylindrical-shaped rib protruding downwardly from a remainder of the upper-head housing beneath the upper bearing and disposed within the cylindrical bore of the lower-head housing.

15. The power tool according to claim 14 , wherein a base-end side diameter of an outer circumferential surface of the rib is equal to or larger than an upper-side inner diameter of the inner circumferential surface of the lower-head housing such that the rib mates with the lower-head housing.