Fan device for radiator

1 . A radiator fan device, comprising:

a fan including a hub and a plurality of blades projecting from the hub;

a motor connected to the fan and configured to rotationally drive the fan, the motor including:

a stator including a stator core, the stator core including a bearing retention hole;

a rotational axis disposed in the bearing retention hole to which the fan is mounted and rotatably supporting the rotational axis relative to the stator core; and

a plurality of bearings arranged within the bearing retention hole; and

a shroud overlying the fan and the motor;

wherein the shroud integrally includes:

a shroud body overlying the fan and the motor; and

a motor anchor part securing the motor to the shroud;

wherein the motor anchor part includes an annular projection protruding into the bearing retention hole and engaging the stator core; and

wherein the annular projection is offset from the plurality of bearings in an axial direction.

2 . The radiator fan device according to claim 1 , wherein the motor anchor part further includes a base plate on which the annular projection is disposed.

3 . The radiator fan device according to claim 2 , wherein the base plate is a flat plate.

4 . The radiator fan device according to claim 2 , wherein the base plate has a shape corresponding to a shape of a bottom surface of the stator core of the stator.

5 . The radiator fan device according to claim 1 , wherein the annular projection includes a plurality of positioning parts protruding from the annular projection and engaging the stator core.

6 . The radiator fan device according to claim 5 , wherein:

the plurality of positioning parts are a plurality of protrusions disposed on and protruding from an outer circumferential surface of the annular projection; and

the plurality of protrusions abut an inner circumferential surface of the stator core that defines the bearing retention hole.

7 . The radiator fan device according to claim 6 , wherein the plurality of protrusions are arranged on the outer circumferential surface of the annular projection spaced apart from one another in a circumferential direction.

8 . The radiator fan device according to claim 5 , wherein:

the plurality of positioning parts protrude from a surface of the annular projection extending transversely to the base plate; and

the plurality of positioning parts abut a surface of the stator core that defines the bearing retention hole.

9 . The radiator fan device according to claim 1 , wherein the shroud further includes an opening through which at least a portion of the motor is passable.

10 . The radiator fan device according to claim 9 , wherein the opening of the shroud includes a tapered portion and an untapered portion.

11 . The radiator fan device according to claim 9 , wherein the shroud further includes a plurality of axially extending protrusions projecting radially into the opening.

12 . The radiator fan device according to claim 9 , wherein the motor further includes an energized part disposed in and extending through the opening of the shroud.

13 . The radiator fan device according to claim 12 , wherein the energized part is a magnet wire, a terminal, and/or a bus bar.

14 . The radiator fan device according to claim 1 , wherein:

the shroud further includes a positioning opening;

the motor includes a positioning part complimentary to the positioning opening; and

the positioning part of the motor is received by the positioning opening of the shroud when the motor is properly positioned relative to the shroud.

15 . The radiator fan device according to claim 1 , wherein the annular projection is arranged in axial alignment with at least one of the plurality of bearings.

16 . The radiator fan device according to claim 1 , wherein:

the motor anchor part further includes a base plate and an elevated region protruding from the base plate; and

the annular projection is disposed on and protrudes from an axial end of the elevated region.

17 . The radiator fan device according to claim 16 , wherein the stator core is at least partially arranged on the axial end of the elevated region of the motor anchor part.

18 . The radiator fan device according to claim 16 , wherein:

the plurality of bearings includes a first bearing and a second bearing; and

the second bearing is arranged axially between the first bearing and a distal end of the annular projection disposed opposite the elevated region of the base plate.

19 . A radiator fan device, comprising:

a fan including a hub and a plurality of blades projecting from the hub;

a motor configured to rotationally drive the fan, the motor connected to the fan and at least partially arranged in the hub; and

a shroud including:

a shroud body overlying the fan and the motor;

a motor anchor part engaged with the motor and securing the motor to the shroud; and

an opening through which at least a portion of the motor is passable;

wherein the opening of the shroud includes a tapered portion and an untapered portion;

wherein the motor includes:

a stator including a stator core, the stator core including a bearing retention hole;

a rotational axis disposed in the bearing retention hole to which the fan is mounted; and

a pair of bearings arranged within the bearing retention hole and rotatably supporting the rotational axis relative to the stator core; and

wherein the motor anchor part includes an annular projection engaged with the stator core and disposed offset from the pair of bearings in an axial direction.