Seat drive motor and power seat system

1. A seat drive motor comprising: a bracket;

a housing that is held by the bracket and receives a rotatable member and a linearly movable member; and

a motor unit that drives the rotatable member, wherein:

the linearly movable member is driven linearly through the rotatable member upon rotation of the motor unit;

one end of the housing contacts the bracket;

the housing includes:

a rotatable member support portion that supports an axial force of the rotatable member, which is exerted in an axial direction of the rotatable member upon rotation of the rotatable member; and

at least one rib that is arranged radially inward of a peripheral wall of the one end of the housing and at least partially overlaps with the rotatable member support portion in the axial direction of the rotatable member;

the at least one rib contacts the bracket and supports the rotatable member support portion relative to the bracket in the axial direction of the rotatable member when the axial force of the rotatable member is applied to the at least one rib;

each rib of the housing has a bracket side end surface, which contacts the bracket in the axial direction of the rotatable member;

the peripheral wall of the housing has a bracket side end surface, which contacts the bracket in the axial direction of the rotatable member; and

the bracket side end surface of each rib of the housing and the bracket side end surface of the peripheral wall of the housing are located in a common plane that extends perpendicular to the axial direction of the rotatable member.

2. The seat drive motor according to claim 1 , wherein the housing is made of resin.

3. The seat drive motor according to claim 1 , wherein the at least one rib includes a plurality of radial ribs, which are circumferentially arranged one after another about a rotational axis of the rotatable member.

4. The seat drive motor according to claim 1 , wherein the at least one rib includes at least one annular rib, which extends circumferentially about the rotational axis of the rotatable member.

5. A seat drive motor comprising:

a bracket;

a housing that is held by the bracket and receives a rotatable member and a linearly movable member; and

a motor unit that drives the rotatable member, wherein:

the linearly movable member is driven linearly through the rotatable member upon rotation of the motor unit;

one end of the housing contacts the bracket; the housing includes:

a rotatable member support portion that supports an axial force of the rotatable member, which is exerted in an axial direction of the rotatable member upon rotation of the rotatable member; and

at least one rib that is arranged radially inward of a peripheral wall of the one end of the housing and at least partially overlaps with the rotatable member support portion in the axial direction of the rotatable member; and

the at least one rib contacts the bracket and supports the rotatable member support portion relative to the bracket in the axial direction of the rotatable member when the axial force of the rotatable member is applied to the at least one rib;

each rib of the housing has a bracket side end surface, which contacts the bracket in the axial direction of the rotatable member;

the peripheral wall of the housing has a bracket side end surface, which contacts the bracket in the axial direction of the rotatable member; and

the bracket side end surface of each rib of the housing is displaced from the bracket side end surface of the peripheral wall of the housing in the axial direction of the rotatable member.

6. The seat drive motor according to claim 5 , wherein the housing is made of resin.

7. The seat drive motor according to claim 5 , wherein the at least one rib includes a plurality of radial ribs, which are circumferentially arranged one after another about a rotational axis of the rotatable member.

8. The seat drive motor according to claim 5 , wherein the at least one rib includes at least one annular rib, which extends circumferentially about the rotational axis of the rotatable member.

9. The seat drive motor according to claim 5 , further comprising a space member wherein:

the housing further includes a receiving recess, which is defined radially inward of the at least one rib at the one end of the housing; and

the space member is installed in the receiving recess of the housing and supports the housing relative to the bracket.

10. The seat drive motor according to claim 9 , wherein the space member is detachably installed in the receiving recess of the housing.

11. The seat drive motor according to claim 9 , wherein the space member is a sensor unit, which senses rotation of the rotatable member.

12. The seat drive motor according to claim 11 , wherein:

the sensor unit includes a sensor element; and

the rotatable member includes a sensor magnet, which is radially opposed to the sensor element.

13. The seat drive motor according to claim 9 , wherein the space member includes at least one rib, which supports the housing relative to the bracket.

14. The seat drive motor according to claim 13 , wherein the at least one rib of the space member is arranged radially inward of a peripheral wall of the space member.

15. The seat drive motor according to claim 14 , wherein:

each rib of the space member includes a bracket side end surface, which contacts the bracket in the axial direction of the rotatable member;

the peripheral wall of the space member has a bracket side end surface, which contacts the bracket in the axial direction of the rotatable member; and

the bracket side end surface of each rib of the space member and the bracket side end surface of the peripheral wall of the space member are located in a common plane that extends perpendicular to the axial direction of the rotatable member.

16. The seat drive motor according to claim 14 , wherein:

each rib of the space member includes a bracket side end surface, which contacts the bracket in the axial direction of the rotatable member;

the peripheral wall of the space member has a bracket side end surface, which contacts the bracket in the axial direction of the rotatable member; and

the bracket side end surface of each rib of the space member is displaced from the bracket side end surface of the peripheral wall of the space member in the axial direction of the rotatable member.

17. The seat drive motor according to claim 16 , wherein the bracket side end surface of each rib of the space member is closer to the other end of the housing, which is opposite from the one end of the housing, in comparison to the bracket side end surface of the peripheral wall of the space member.

18. The seat drive motor according to claim 16 , wherein the bracket side end surface of the peripheral wall of the space member is closer to the other end of the housing, which is opposite from the one end of the housing, in comparison to the bracket side end surface of each rib of the space member.

19. A power seat system comprising:

the seat drive motor according to claim 5 ; and

a vehicle seat that is driven by the seat drive motor.

20. The scat drive motor according to claim 5 , wherein the bracket side end surface of each rib of the housing is closer to the other end of the housing, which is opposite from the one end of the housing, in comparison to the bracket side end surface of the peripheral wall of the housing.

21. The seat drive motor according to claim 5 , wherein the bracket side end surface of the peripheral wall of the housing is closer to the other end of the housing, which is opposite from the one end of the housing, in comparison to the bracket side end surface of each rib of the housing.

22. The seat drive motor according to claim 1 , further comprising a space member wherein:

the housing further includes a receiving recess, which is defined radially inward of the at least one rib at the one end of the housing; and

the space member is installed in the receiving recess of the housing and supports the housing relative to the bracket.

23. The seat drive motor according to claim 22 , wherein the space member is detachably installed in the receiving recess of the housing.

24. The seat drive motor according to claim 22 , wherein the space member is a sensor unit, which senses rotation of the rotatable member.

25. The seat drive motor according to claim 24 , wherein:

the sensor unit includes a sensor element; and

the rotatable member includes a sensor magnet, which is radially opposed to the sensor element.

26. The seat drive motor according to claim 22 , wherein the space member includes at least one rib, which supports the housing relative to the bracket.

27. The seat drive motor according to claim 26 , wherein the at least one rib of the space member is arranged radially inward of a peripheral wall of the space member.

28. The seat drive motor according to claim 27 , wherein:

each rib of the space member includes a bracket side end surface, which contacts the bracket in the axial direction of the rotatable member;

the peripheral wall of the space member has a bracket side end surface, which contacts the bracket in the axial direction of the rotatable member; and

the bracket side end surface of each rib of the space member and the bracket side end surface of the peripheral wall of the space member are located in a common plane that extends perpendicular to the axial direction of the rotatable member.

29. The seat drive motor according to claim 27 , wherein:

each rib of the space member includes a bracket side end surface, which contacts the bracket in the axial direction of the rotatable member;

the peripheral wall of the space member has a bracket side end surface, which contacts the bracket in the axial direction of the rotatable member; and

the bracket side end surface of each rib of the space member is displaced from the bracket side end surface of the peripheral wall of the space member in the axial direction of the rotatable member.

30. The seat drive motor according to claim 29 , wherein the bracket side end surface of each rib of the space member is closer to the other end of the housing, which is opposite from the one end of the housing, in comparison to the bracket side end surface of the peripheral wall of the space member.

31. The seat drive motor according to claim 29 , wherein the bracket side end surface of the peripheral wall of the space member is closer to the other end of the housing, which is opposite from the one end of the housing, in comparison to the bracket side end surface of each rib of the space member.

32. A power seat system comprising:

the seat drive motor according to claim 1 ; and

a vehicle seat that is driven by the seat drive motor.