Method for producing units with axially movable components

Patent metadata

Field	Value
Publication number	US-11813801-B2
Application number	US-201816650122-A
Country	US
Kind code	B2
Filing date	Sep 27, 2018
Priority date	Oct 5, 2017
Publication date	Nov 14, 2023
Grant date	Nov 14, 2023

Abstract

A method may produce an axially movable connection between two components with a plastic as a sliding material arranged therebetween. The method may involve providing the two components and either at least one of the two components has a plastic coating or a plastic sleeve is provided between the components, joining the two components to form a unit via a pressing force in an axial direction, clamping the unit in a device in which the two components are clampable and subjectable to a displacement force in the axial direction, pressing a sonotrode against an outer of the two components and bracing the outer component against a counter-holder, injecting an ultrasound signal into the sonotrode and moving the two components back and forth in the axial direction until a displacement force or a displacement velocity reaches a target, and ending the ultrasound signal and removing the unit from the device.

First claim

What is claimed is:

1. A method for producing an axially movable connection between two components, between which two components a plastic is disposed as a sliding material, the method comprising:
providing the two components to be joined, wherein
a plastic sleeve is disposed between the two components, and the two components, and the plastic sleeve are situated free of play with respect to each other;

joining the two components to form a unit by way of a pressing force in an axial direction;
clamping the unit in a device in which the two components are clampable and subjectable to a displacement force in the axial direction;
pressing a sonotrode from one side against an outer of the two components and bracing the outer of the two components against a counter-holder;
injecting an ultrasound signal into the sonotrode and moving the two components back and forth in the axial direction until a displacement force or a displacement velocity reaches a target value; and
ending the ultrasound signal and removing the unit from the device.

2. The method of claim 1 wherein a frequency of the ultrasound signal is in a range of 20 to 35 kHz.

3. The method of claim 1 comprising varying a frequency of the ultrasound signal while injecting the ultrasound signal into the sonotrode.

4. The method of claim 1 wherein the two components comprise an inner shaft piece and an outer shaft piece.

5. The method of claim 1 wherein the two components comprise an inner shaft piece and an outer shaft piece of a motor vehicle steering system.

6. The method of claim 1 wherein the two components comprise an inner casing tube and an outer casing tube of an axially telescopic motor vehicle steering system.

7. The method of claim 1 wherein the sonotrode is a first sonotrode, the method comprising pressing the first sonotrode and a second sonotrode against the outer of the two components.

8. The method of claim 7 comprising injecting the first and second sonotrodes with ultrasound signals of different frequencies.

9. A motor vehicle steering system comprising a telescopic steering shaft and/or a telescopic casing tube unit that is produced according to the method of claim 1 .

Assignees

• Thyssenkrupp Presta Ag
• Thyssenkrupp Ag

Inventors

• Hirschauer Peter

Classifications

• B29C65/088 Primary

  using several cooperating sonotrodes, i.e. interacting with each other, e.g. for realising the same joint · CPC title

• B29C65/565

  involving interference fits, e.g. force-fits or press-fits (B29C65/66 takes precedence) · CPC title

• B29C66/5221

  for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other · CPC title

• B29C66/5241

  for forming coaxial connections, i.e. the profiled elements to be joined forming a zero angle relative to each other · CPC title

• B29C66/93411

  the parts to be joined having different speeds · CPC title