Spindle-rotor unit

Patent metadata

Field	Value
Publication number	US-2016290455-A1
Application number	US-201415038685-A
Country	US
Kind code	A1
Filing date	Nov 3, 2014
Priority date	Nov 27, 2013
Publication date	Oct 6, 2016
Grant date	—

Abstract

A spindle drive unit, in particular for an actuator having a planetary screw drive (PWG) for actuating a clutch of a motor vehicle by an actuating element is provided, where the drive unit has an e-motor with a rotor and a stator and where a spindle provided with a pitch is connected non-rotatingly to the rotor and is drivable by the rotor around an axis of rotation. The spindle is designed as a threaded rod and a rotor carrier that holds the rotor is screwed onto the threaded rod, and the rotor carrier is rotationally secured and axially fixed on the spindle by a lock nut.

First claim

1 - 10 . (canceled)

11 . A spindle drive unit comprising:
an e-motor with a rotor and a stator; a spindle provided with a pitch and connected non-rotatingly to the rotor, the spindle drivable by the rotor around an axis of rotation, the spindle including a threaded rod; and a rotor carrier holding the rotor and screwed onto the threaded rod, the rotor carrier being rotationally secured and axially fixed on the spindle via a lock nut.

12 . The spindle drive unit as recited in claim 11 wherein the lock nut is screwed onto a side of the spindle opposite the piston to connect the rotor carrier non-rotatingly.

13 . The spindle drive unit as recited in claim 11 further comprising an intermediate plate positioned between rotor carrier and lock nut.

14 . The spindle drive as recited in claim 13 further comprising, between the bearing carrier and lock nut, a spring accumulator operating in the axial direction, the spring accumulator being combined with the intermediate plate.

15 . The spindle drive as recited in claim 13 wherein the intermediate plate is a spring accumulator.

16 . The spindle drive unit as recited in claim 11 further comprising a signal generator positioned in or on the lock nut or in or on an intermediate plate or in or on a spring accumulator.

17 . The spindle drive unit as recited in claim 11 wherein the lock nut is designed as a self-clamping nut.

18 . The spindle drive unit as recited in claim 11 wherein the stator is held on a frame-fixed stator carrier and the rotor carrier ( 21 ) is supported rotatingly on the stator carrier via a bearing having an inner ring and an outer ring, the bearing being fastened on the bearing carrier by a reshaped region of the bearing carrier.

19 . The spindle drive unit as recited in claim 18 wherein the rotor carrier has an axially extending first region provided with inner threading and screwed onto the spindle, the first region being adjoined on the side of the lock nut by a radially extending region, followed at a radial interval from the axially extending first region by an axially extending second region, so that between the first region and the second region an annular space is formed, the stator carrier carrying the stator engaging the annular space of the rotor carrier with the bearing, and
in a first variant the bearing is operationally connected by its bearing inner ring non-rotatingly to the stator carrier and is secured axially by the reshaped region, and is operationally connected by its bearing outer ring non-rotatingly to the second region of the rotor carrier and secured axially, or
the bearing is operationally connected by its bearing inner ring non-rotatingly to the first region of the rotor carrier and axially secured, and is operationally connected by its bearing outer ring non-rotatingly to the stator carrier and secured axially by the reshaped region,

and
in a second variant the bearing is operationally connected by a bearing outer ring non-rotatingly to the second region of the rotor carrier and secured axially, and to that end has a securing element located in the bearing outer ring which can be deformed radially inward during assembly and snaps into a groove in the second region of the rotor carrier.

20 . The spindle drive unit as recited in claim 19 in the first variant the bearing inner ring rests against a flange of the bearing carrier, facing axially away from the lock nut, and is fixed axially in the direction of the lock nut with a radially outward reshaped region of the stator carrier, and a securing element located in the bearing outer ring is deformable radially inward and snaps into a groove of the rotor carrier after assembly and fixes the bearing outer ring axially on the rotor carrier.

21 . The spindle drive unit as recited in claim 19 wherein the second variant the bearing inner ring is clamped axially against the first region of the rotor carrier in the direction of the lock nut by a bearing fastening nut, and the bearing outer ring rests axially in the direction of the lock nut on a region of the stator carrier bent inward, and facing axially away from the lock nut is fixed axially by a flange of the stator carrier reshaped radially inward after the bearing is mounted on the stator carrier.

22 . A motor vehicle comprising a clutch and the spindle drive unit as recited in claim 10 , the spindle drive unit being for an actuator having a planetary screw drive for actuating the clutch.

Assignees

• Schaeffler Technologies Ag
• Schaeffler Technologies Ag

Inventors

• Schumann Lars
• Man Lazlo
• Greb Peter
• Dreher Alexander

Classifications

• F16H25/2472

  Safety nuts · CPC title

• F16H25/2252 Primary

  Planetary rollers between nut and screw · CPC title

• F16H2025/2075

  Coaxial drive motors · CPC title

• F16D23/12

  Mechanical clutch-actuating mechanisms arranged outside the clutch as such (specific for combined clutches F16D21/00; mechanisms specific for synchronisation F16D23/02) · CPC title

• F16H25/2015

  Means specially adapted for stopping actuators in the end position; Position sensing means · CPC title