A linear actuation screw having a first end portion, a second end portion on an opposite side as the first end portion, and a sloping intermediate portion between the first end portion and second end portion. The first end portion has a threaded outer wall having a generally constant first diameter
A linear actuation screw having a first end portion, a second end portion on an opposite side as the first end portion, and a sloping intermediate portion between the first end portion and second end portion. The first end portion has a threaded outer wall having a generally constant first diameter over at least a portion of its length and is configured to advance a nut or a sliding member along at least a portion of the first end portion. The second end portion has a threaded outer wall having a generally constant second diameter that is different from the first diameter and is configured to receive a motor fastening nut around it in order to secure the linear actuation screw to a motor. The sloping intermediate portion includes an outer wall that is generally smooth and continuous over at least a majority of the area of the outer wall.
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1. A linear actuation screw comprising an elongated shaft having a first end portion, a second end portion on an opposite side of the elongated shaft as the first end portion, and a sloping intermediate portion between the first end portion and the second end portion, wherein: a. the first end porti
1. A linear actuation screw comprising an elongated shaft having a first end portion, a second end portion on an opposite side of the elongated shaft as the first end portion, and a sloping intermediate portion between the first end portion and the second end portion, wherein: a. the first end portion has a threaded outer wall having a generally constant first diameter as measured from a crest over at least a portion of its length and is configured to advance a nut or a sliding member along at least a portion of the first end portion;b. the second end portion has a threaded outer wall having a generally constant second diameter that is different from the first diameter and is configured to receive a motor fastening nut around it in order to secure the linear actuation screw to a motor; andc. the sloping intermediate portion includes an outer wall that is generally smooth and continuous over at least a majority of the area of the outer wall. 2. The linear actuation screw of claim 1, wherein the first diameter of the threaded outer wall of the first end portion, the second diameter of the threaded outer wall of the second end portion, or both, is generally constant over substantially the entire length of the first end portion, the second end portion, or both. 3. (canceled) 4. The linear actuation screw of claim 1, wherein the threaded outer wall of the first end portion, the threaded outer wall of the second end portion, or both, is threaded over only a portion of the first end portion, the second end portion, or both. 5. The linear actuation screw of claim 1, wherein the threaded outer wall of the first end portion, the threaded outer wall of the second end portion, or both, is threaded over greater than 50 percent of the length of the first end portion, the second end portion, or both. 6. (canceled) 7. The linear actuation screw of claim 1, wherein a portion is unthreaded between the first end portion and the second end portion. 8. The linear actuation screw of claim 1, wherein an average first diameter of the first end portion as measured from a trough is different from an average second diameter of the second end portion as measured from a trough. 9. The linear actuation screws of claim 1, wherein the sloping intermediate portion has a slope between about 5 degrees and about 10 degrees relative to a longitudinal axis of the linear actuation screw. 10. The linear actuation screw of claim 9, wherein the sloping intermediate portion has a generally constant slope over a majority of its length. 11. The linear actuation screw of claim 1, wherein a ratio of the length of the second end portion to a length of the sloping intermediate portion is about 3.3:1 to about 0.7:1. 12. (canceled) 13. The linear actuation screw of claim 1, wherein the linear actuation screw is adapted to penetrate at least partially through a through passage of a motor and be secured. 14. The linear actuation screw of claim 1, wherein an encoder journal is located at and extends from the second end portion of the linear actuation screw along the longitudinal axis of the linear actuation screw for receipt within an encoder. 15. The linear actuation screw of claim 1, wherein the linear actuation screw is a ball screw. 16.-27. (canceled) 28. An actuator assembly comprising: a. the linear actuation screw of claim 1,b. a carrier that carries the linear actuation screw;c. a motor that drives rotation of the linear actuation screw;d. and a linear slider for translating fore and aft along an axis that is generally parallel to the longitudinal axis of the linear actuation screw. 29. The actuator assembly of claim 28, wherein the carrier includes a first end portion and a second end portion, the first end portion having at least one end bearing and supporting the first end portion of the linear actuation screw; the second end portion including the motor; and wherein the second end portion of the linear actuation screw is attached directly to the motor and penetrates at least partially into the motor. 30. The actuator assembly of claim 28, wherein the carrier includes a linear rail upon which the slider translates fore and aft. 31. The actuator assembly of claim 28, wherein the assembly is free of an intermediate support unit between the motor and the at least one end bearing. 32. The actuator assembly of claim 28, wherein the assembly is free of a motor bracket, an adapter or coupling, any support unit, or a combination thereof. 33. The actuator assembly of claim 28, wherein the linear actuation screw is a ball screw. 34. The actuator assembly of claim 28, wherein the carrier has an overall length, and wherein the linear actuation screw has a travel length over the distance which a screw nut located on the linear actuation screw can travel; and wherein a ratio of the overall length of the carrier to the travel length of the linear actuation screw is about 1.4:1 or less. 35. The actuator assembly of claim 28, wherein the actuator assembly results in a reduction of overall length of at least 15% as compared with a traditional structure having an intermediate support unit.
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