Linear actuator

Patent metadata

Field	Value
Publication number	US-10041512-B2
Application number	US-201415039903-A
Country	US
Kind code	B2
Filing date	Nov 17, 2014
Priority date	Dec 6, 2013
Publication date	Aug 7, 2018
Grant date	Aug 7, 2018

Abstract

A linear actuator for generating a linear actuating force, including a first drive unit having a first drive shaft designed as a hollow shaft, a first rotation-translation transmission driven by the first drive unit, having a first threaded spindle and a first threaded nut engaging with the threaded spindle, wherein the drive shaft of the first drive unit is designed as a first threaded spindle, a second drive unit arranged axially to the first drive unit and having a drive shaft, and a second rotation-translation transmission driven by the second drive unit, having a second threaded spindle and a threaded nut engaging with the second threaded spindle, wherein the drive shaft of the second drive unit is connected to the second threaded spindle; via the hollow shaft in a rotationally fixed manner.

First claim

The invention claimed is:

1. A linear actuator for generating a linear actuating force, comprising:
a first motorized drive unit having a first drive shaft formed as a hollow shaft,
a first rotation-translation gear driven by the first motorized drive unit and having a first threaded spindle and a first threaded nut in engagement with the threaded spindle, wherein the drive shaft of the first motorized drive unit is configured as the first threaded spindle,
a second motorized drive unit arranged axially to the first motorized drive unit and having a drive shaft, and
a second rotation-translation gear driven by the second motorized drive unit and having a second threaded spindle and a threaded nut in engagement with the second threaded spindle, wherein the drive shaft of the second motorized drive unit is connected rotationally fixedly to the second threaded spindle via the hollow shaft,
a first force transmission element disposed radially outward from the first threaded spindle and coupled thereto, and
a second force transmission element disposed radially outward from the second threaded spindle and coupled thereto.

2. The linear actuator as claimed in claim 1 , wherein the first threaded nut is connected to the force transmission element, and the second threaded nut is connected to the second force transmission element.

3. The linear actuator as claimed in claim 2 , wherein the first and second force transmission elements are configured as hydraulic or pneumatic pistons which cooperate with cylindrical chambers arranged in the hydraulic or pneumatic block and adapted to the hydraulic or pneumatic pistons.

4. The linear actuator as claimed in claim 3 , wherein the first and second rotation-translation gears are arranged on opposite sides of the hydraulic or pneumatic block.

5. The linear actuator as claimed in claim 1 , wherein the first and second drive units are each configured as an electric motor.

6. The linear actuator as claimed in claim 1 , wherein the first and second rotation-translation gears are each formed as a ball-screw drive.

7. The linear actuator as claimed in claim 1 , wherein a control unit is assigned to each of the first and second drive units, wherein the control units are configured identically.

8. A linear actuator for generating a linear actuating force, comprising:
a first motorized drive unit having a first drive shaft formed as a hollow shaft,
a first rotation-translation gear driven by the first motorized drive unit and having a first threaded spindle and a first threaded nut in engagement with the threaded spindle, wherein the drive shaft of the first motorized drive unit is configured as the first threaded spindle, and the first threaded nut is connected to a first force transmission element,
a second motorized drive unit arranged axially to the first motorized drive unit and having a drive shaft, and
a second rotation-translation gear driven by the second motorized drive unit and having a second threaded spindle and a threaded nut in engagement with the second threaded spindle, wherein the drive shaft of the second motorized drive unit is connected rotationally fixedly to the second threaded spindle via the hollow shaft, and the second threaded nut is connected to a second force transmission element,
wherein the first and second force transmission elements cooperate with a hydraulic or pneumatic block to generate a hydraulic or pneumatic pressure.

9. The linear actuator as claimed in claim 8 , wherein the first and second rotation-translation gears are arranged on opposite sides of the hydraulic or pneumatic block.

10. The linear actuator as claimed in claim 8 , wherein the first and second drive units together with the first rotation-translation gear are arranged in a first housing which is flanged to the hydraulic or pneumatic block.

11. The linear actuator as claimed in claim 8 , wherein the second rotation-translation gear is arranged in a second housing which is flanged to the hydraulic or pneumatic block.

12. A linear actuator for generating a linear actuating force, comprising:
a first motorized drive unit having a first drive shaft formed as a hollow shaft,
a first rotation-translation gear driven by the first motorized drive unit and having a first threaded spindle and a first threaded nut in engagement with the threaded spindle, wherein the drive shaft of the first motorized drive unit is configured as the first threaded spindle,
a second motorized drive unit arranged axially to the first motorized drive unit and having a drive shaft, and
a second rotation-translation gear driven by the second motorized drive unit and having a second threaded spindle and a threaded nut in engagement with the second threaded spindle, wherein the drive shaft of the second motorized drive unit is connected rotationally fixedly to the second threaded spindle via the hollow shaft,
wherein the first threaded nut is at least partially surrounded by the rotor of the first drive unit.

13. The linear actuator as claimed in claim 12 , wherein the first and second drive units are each configured as an electric motor.

Assignees

• Continental Teves Ag & Co Ohg

Inventors

• Stauder Peter
• Schaaf Matthias
• Kaufmann Tom

Classifications

• H02K16/00

  Machines with more than one rotor or stator {(machines for transmitting mechanical power from a driving shaft to a driven shaft and comprising structurally interrelated motor and generator parts H02K51/00; permanent magnet machines with multiple rotors or stators relatively rotated for vectorially combining the excitation fields or the armature voltages H02K21/029)} · CPC title

• H02K7/083

  radially supporting the rotary shaft at both ends of the rotor (H02K7/086, H02K7/09 take precedence) · CPC title

• F16H2025/2075

  Coaxial drive motors · CPC title

• F16H25/205

  comprising alternate power paths, e.g. for fail safe back-up · CPC title

• B60T13/746 Primary

  and mechanical transmission of the braking action · CPC title