DEVICE FOR ACTUATING AN ADJUSTING OR SHIFTING ELEMENT

Abstract

A device having an adjusting drive and a transfer element. The adjusting drive includes a stator and a rotor. The transfer element converts rotational motion to translational motion. The stator is axially longer than the rotor which axially slides within the stator. The difference in length approximately corresponds to the extent of desired axial movement of the rotor. Thus the rotor is provided with a constant electromagnetic torque over the length of axial movement of the rotor. The transfer element, located within the rotor, has a nut/screw connection, which converts torque into an axial adjusting force. A gap, between the stator and rotor, has a size relating to the desired electromagnetic properties of the motor and acts as a bearing during axial movement of the rotor, thus reducing the number of parts needed for the device parts, the amount of wear and favorable production costs when compared with conventional solutions.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will now be described, by way of example, with reference to the accompanying drawings in which:

A single FIGURE shows a section through an inventive device.

DETAILED DESCRIPTION OF THE INVENTION

The device 1 essentially comprises of one adjusting drive and one transfer element 12. The adjusting drive comprises at least one rotor 9 and one stator 2 with plates 3 and windings 4. The stator 2 is fastened in a housing 8 and has larger axial length than the rotor 9. One air gap 13 separates the stator 2 and the rotor 9 from one another. The air gap 13 works as a contact-free bearing for the translational motion of the rotor. Upon the inner side of the rotor 9 and upon the outer side of a spindle 6, outer and inner threads 5, 7 are formed. The rotor 9 is non-rotatably mounted on the spindle 6, which is fastened to the housing 8, and by the outer and inner threads 5, 7 is carried by the spindle 6. Alternatively, the rotor 9 is made with a spindle nut and supported by the spindle nut upon the spindle 6. When an electromagnetic torque acts upon the rotor 9, such that rotor 9 will rotate and by way of the outer and inner threads 5, 7 of the rotor 9 and the spindle 6, the rotary motion of the rotor 9 is converted to a translational motion of the rotor 9. By an actuation element 10, fastened on the rotor 9, the translational motion is relayed to an adjusting or shifting element 11, such as a clutch (not shown).

REFERENCE NUMERALS

• 1 device
• 2 stator
• 3 stator plate
• 4 stator winding
• 5 outer thread
• 6 spindle/inner part of the transfer element
• 7 inner thread
• 8 housing
• 9 rotor/outer part of transfer element
• 10 actuation element
• 11 adjusting or shifting element
• 12 transfer element
• 13 air gap

Claims

1-7. (canceled)

8. A device for actuating at least one of an adjusting and a shifting element of a vehicle transmission, the device comprising: an electric adjusting drive with at least one stator (2),a rotor (9); anda transfer element (12) for converting a rotation motion to a translational motion,the rotor (9) is axially movably supported relative to the stator (2), the stator (2) having an axial length larger than an axial length of the rotor (9), and the transfer element (12) is located radially within the rotor (9).

9. The device according to claim 8, wherein the transfer element (12) includes an outer part (9) and an inner part (6), the outer part (9) is non-rotatably connected with the inner part (6) and the inner part (6) is situated stationary relative to the stator (2)

10. The device according to claim 9, wherein the outer part (9) of the transfer element (12) has an inner thread (7).

11. The device according to claim 9, wherein the inner part (6) of the transfer element (12) is a carrier for the rotor (9).

12. The device according to claim 9, wherein the outer part (9) is a spindle nut and the inner part (6) is a threaded spindle with a trapezoidal thread.

13. The device according to claim 8, wherein the transfer element (12) is one of a ball rolling spindle, a nut/screw connection, a planetary rolling thread, a worm drive transmission and a following thread drive.

14. The device according to claim 8, wherein the device (1) one of actuates a clutch adjuster or a shifting element (11) of the vehicle transmission and adjusts running gear components of an actively running gear of a motor vehicle.

15. A device for actuating at least one of an adjusting and a shifting element in a vehicle transmission, the device comprising: a stator (2) being fixed to a housing (8) by a stator plate (3) and having windings (4) extending over an axial length to apply an electromagnetic rotational force;a rotor (9), located coaxially within the stator (2), being rotationally fixed and axially slidable in relation to the stator (2) and having an axial length shorter than the axial length of the stator (2), the rotor (9) further has interior threads (7); anda spindle (6) being fixed to the housing (3) and extending coaxially within the rotor (9), the fixed spindle (6) having exterior threads which engage the interior threads of the axially slidable rotor (9), such that when the electromagnetic rotational torque is applied by the stator (2), the rotor (9) slides axially relative to both the stator (2) and the spindle (6).