Helical gearing driven by electric motor for driving an adjusting element, and installation device

Patent metadata

Field	Value
Publication number	US-11221062-B2
Application number	US-201817053351-A
Country	US
Kind code	B2
Filing date	Aug 13, 2018
Priority date	May 9, 2018
Publication date	Jan 11, 2022
Grant date	Jan 11, 2022

Abstract

A helical gearing for driving an adjusting element, which may be an actuator or a piston of a piston-cylinder unit, is driven by an electric motor. The adjusting element may be moved along an axis. The drive apparatus has a rotor, or a translator rotatably mounted in a housing by a bearing and fixedly connected to the input of or formed integrally with the helical gearing. The output of the helical gearing is connected to or formed integrally with the adjusting element. An anti-twist means may prevent the adjusting element from twisting in the circumferential direction about the axis. The helical gearing and/or at least part of the adjusting element is/are formed to be transversely elastic to the axis of rotation, at least in one region.

First claim

What is claimed is:

1. An electric-motor-driven helical gear mechanism for driving an adjustment element comprising an actuator or a piston of a piston-cylinder unit, including:
an electric drive; and
a helical gear mechanism,
wherein the adjustment element is movable back and forth along an axis by means of the electric drive and the helical gear mechanism,
wherein the electric drive includes a rotor or a transmitter that is driven by a drive mechanism, wherein the rotor or transmitter is mounted rotatably in a housing by means of a first bearing and is fixedly connected to or formed integrally with an input of the helical gear mechanism,
wherein an output of the helical gear mechanism is connected to or formed integrally with the adjustment element, and further including
a rotation-preventing securing means configured to prevent a rotation of the adjustment element in a circumferential direction about the axis,
wherein the rotation-preventing securing means is arranged in or on an end region of the adjustment element, or wherein the end region is part of the rotation-preventing securing means, wherein the end region is a region of the adjustment element facing away from the helical gear mechanism,

and/or,
wherein, between the first bearing and the adjustment element, the helical gear mechanism and/or at least a part of the adjustment element are/is, at least in one region, formed to be transversely elastic with respect to the axis, wherein the at least one region includes a spring element or an otherwise elastic region.

2. The electric-motor-driven helical gear mechanism as claimed in claim 1 , wherein, there is arranged, in a region of the rotation-preventing securing means, a radial slide bearing configured to support radial forces, or wherein the rotation-preventing securing means is or forms a radial slide bearing.

3. The electric-motor-driven helical gear mechanism as claimed in claim 1 , wherein the helical gear mechanism comprises a spindle nut and a spindle and is connected only: (a) to the rotor or to the transmitter and (b) to the adjustment element.

4. The electric-motor-driven helical gear mechanism as claimed in claim 1 , wherein the first bearing is arranged between a part of the rotor that bears a rotor winding and/or permanent magnets and the input of the helical gear mechanism.

5. The electric-motor-driven helical gear mechanism as claimed in claim 2 , wherein there is no further bearing configured to radially support the rotor or transmitter and the helical gear mechanism between the first bearing and the end region or between the first bearing and the radial slide bearing.

6. The electric-motor-driven helical gear mechanism as claimed in claim 1 , wherein the rotor or the transmitter, at least in a region between the first bearing and the input of the helical gear mechanism, has a spring element or an elastic region having an elasticity that is higher than an elasticity of rotating parts of the helical gear mechanism or is such that the elasticity of the elastic region permits a greater deviation than a deviation of the rotating parts from the central axis.

7. The electric-motor-driven helical gear mechanism as claimed in claim 1 , wherein between the helical gear mechanism and the adjustment element, there is arranged a spring element or a resiliently elastic region, the elasticity of which is higher than the elasticity of rotating parts of the helical gear mechanism or is such that the elasticity of the elastic region permits a greater deviation than a deviation of the rotating parts from the central axis, and/or wherein the helical gear mechanism is elastic or flexible transversely with respect to its axis of rotation.

8. The electric-motor-driven helical gear mechanism as claimed in claim 1 , wherein either the input of the helical gear mechanism is the spindle nut and the output of the helical gear mechanism is the spindle,
or
the input of the helical gear mechanism is the spindle and the output of the helical gear mechanism is the spindle nut.

9. The electric-motor-driven helical gear mechanism as claimed in claim 1 , wherein the rotor or transmitter is of double-walled form in cross section in a region from the first bearing to the input of the helical gear mechanism, wherein the two walls forming the double-walled form are connected to one another via a wall portion which is of U-shaped cross section.

10. The electric-motor-driven helical gear mechanism as claimed in claim 1 , wherein the adjustment element is configured to slide with an end region in a cylindrical guide, wherein an outer radius of said adjustment element is, at least in subregions of an outer wall of said adjusting element, formed such that the end region slides with a sliding fit in the guide and forms a radial slide bearing, and any remaining part of the adjustment element has an outer diameter or an outer contour which is smaller than an outer diameter or outer contour required for a sliding fit.

11. The electric-motor-driven helical gear mechanism as claimed in claim 10 , wherein the cylindrical guide has at least one inwardly pointing projection, in the form of an axially extending web, and/or at least one recess, in particular in the form of one or more grooves, which interacts in each case with a groove or a recess, respectively, in the end region of the adjustment element, or of a part arranged on the end region of the adjustment element, in order to form the rotation-preventing securing means.

12. The electric-motor-driven helical gear mechanism as claimed in claim 11 , wherein the axially extending web is formed by a segment-shaped part which is fastened to an inner wall of the cylindrical guide.

13. The electric-motor-driven helical gear mechanism as claimed in claim 10 , wherein the cylindrical guide has axially running guide surfaces, and wherein the end region of the adjustment element has at least one guide surface, wherein at least one rotatably mounted rolling part is configured to roll on the guide surfaces and, together with these guide surfaces, forms the rotation-preventing securing means, wherein the adjustment element slides at least with a part of the outer wall of the end region on an inner wall of the cylindrical guide with a sliding fit, so as to form a radial slide bearing, wherein, in particular, at least one of the rolling parts transmits circumferential forces and at least one of the rolling parts transmits radial forces.

14. The electric-motor-driven helical gear mechanism as claimed in claim 1 , wherein the rotation-preventing securing means is formed by a recess in the end region of the adjustment element and by an engagement part which engages with the adjustment element, wherein the engagement part is mounted rotationally fixedly on a housing of the adjustment element and is secured against rotation in a circumferential direction about the axis by positive locking, wherein either
the end region has an outer diameter which is configured such that the end region can slide in an axial direction with a sliding fit in a guide or a cylinder, or else
the end region has an outer diameter which is smaller than an outer diameter required for a sliding fit, and wherein the engagement part lies in the recess with a sliding fit and forms a slide bearing.

15. The electric-motor-driven helical gear mechanism as claimed in claim 14 , wherein the end region, a positive-locking part and the engagement part form an Oldham coupling.

16. The electric-motor-driven helical gear mechanism as claimed in claim 1 , wherein the adjustment element is a piston of a piston-cylinder unit, a

Assignees

• Ipgate Ag

Inventors

• Leiber Heinz

Classifications

• F16H61/30

  Hydraulic {or pneumatic} motors {or related fluid control means} therefor · CPC title

• B60T13/741 Primary

  acting on an ultimate actuator · CPC title

• F16H2025/204

  Axial sliding means, i.e. for rotary support and axial guiding of nut or screw shaft · CPC title

• F16H2025/2087

  using planetary gears · CPC title

• F16D65/16

  arranged in or on the brake · CPC title