Magnetically responsive locking mechanism for a vehicle differential

1. A system for a vehicle differential that has multiple gears, the system comprising:

a magnetic field generator that selectively generates a magnetic field;

a drive member movable in response to the magnetic field generated by the magnetic field generator, the drive member being movable along an axis between a first position and a second position, and the drive member having at least one contact surface; and

a lock member adjacent to the drive member and having at least one contact surface that is engaged by the at least one contact surface of the drive member so that the lock member is driven by the drive member to engage a gear of the differential when the drive member is in the second position, and the lock member is adapted to be disengaged from the gear when the drive member is in the first position, wherein one or both of the drive member and the lock member has at least one contact surface that includes a void extending axially in the at least one contact surface such that the at least one contact surface is discontinuous.

2. The system of claim 1 wherein the discontinuous contact surface is defined at least in part by multiple voids formed in one or both of the drive member and the lock member.

3. The system of claim 1 wherein one or both of the drive member and the lock member includes a main body and a foot extending from the main body, and wherein the discontinuous contact surface is defined by a void formed in an axial end of the foot so that an axially outermost surface of the foot is interrupted by the void.

4. The system of claim 3 wherein the discontinuous contact surface is defined at least in part by one or more voids formed in the foot.

5. The system of claim 4 wherein the voids include multiple grooves that are separate from each other.

6. The system of claim 4 wherein the voids include multiple grooves and wherein at least some of the grooves intersect each other.

7. The system of claim 3 wherein the foot is cantilevered to the main body and extends to an axial end, and the axial end is not planar.

8. The system of claim 7 wherein the axial end includes multiple first portions at a different axial height than a second portion, wherein the second portion is located between at least two of the multiple first portions so that the at least two portions are not continuous with each other.

9. The system of claim 3 wherein the discontinuous contact surface is defined at least in part by an opening formed in an axial end of the foot.

10. The system of claim 9 wherein the void includes a hole extending axially into the axial end.

11. The system of claim 10 which also includes a passage extending through the foot axially spaced from the axial end, and wherein the hole communicates with the passage.

12. The system of claim 3 wherein at least one void is formed in the foot and the void extends to at least one peripheral edge of the foot.

13. The system of claim 12 wherein at least two peripheral locations of the foot are communicated with one or more voids.

14. An apparatus for a vehicle differential, comprising:

a drive member having an axis and including an annular main body with multiple feet extending from the main body, at least one foot having a contact surface; and

a lock member having an axis and including an annular main body with multiple feet extending from the main body, at least one foot of the lock member having a contact surface engageable by one or more of the contact surfaces of the drive member, wherein at least one contact surface of one or both of the drive member and the lock member has multiple first portions at a first height and a second portion at a second height that is different than the first height, wherein the second portion is between at least two of the multiple first portions.

15. The drive member of claim 14 wherein the feet are cantilevered to the main body and have a free end on which the contact surface is defined.

16. The drive member of claim 14 wherein the contact surface is defined at least in part by one or more voids formed in at least one foot and defining the second portion.

17. The drive member of claim 16 wherein the one or more voids include at least two voids that are separate from each other or wherein the at least two voids intersect each other.

18. The drive member of claim 16 wherein at least one void extends to at least one peripheral edge of the foot.

19. A system for a vehicle differential that has multiple gears, the system comprising:

a magnetic field generator that selectively generates a magnetic field;

a drive member movable in response to the magnetic field generated by the magnetic field generator, the drive member being movable between a first position and a second position, and the drive member having at least one contact surface; and

a lock member adjacent to the drive member and having at least one contact surface that is engaged by the at least one contact surface of the drive member so that the lock member is driven by the drive member to engage a gear of the differential when the drive member is in the second position, and the lock member is adapted to be disengaged from the gear when the drive member is in the first position, wherein one or both of the drive member and the lock member has at least one contact surface that is discontinuous, wherein one or both of the drive member and the lock member includes a main body and a foot extending from the main body, and wherein the discontinuous contact surface is defined by the foot, wherein the discontinuous contact surface is defined at least in part by one or more voids formed in the foot, and wherein: a) the voids include multiple grooves that are separate from each other; or b) the voids include multiple grooves and at least some of the grooves intersect each other.