Method for producing a spindle for a spindle drive, a roller screw drive comprising such a spindle and use of said roller screw drive

Patent metadata

Field	Value
Publication number	US-9239102-B2
Application number	US-201013502597-A
Country	US
Kind code	B2
Filing date	Sep 6, 2010
Priority date	Oct 20, 2009
Publication date	Jan 19, 2016
Grant date	Jan 19, 2016

Abstract

The disclosure relates to a threaded shaft for a roller screw drive, for example for an electromechanical brake booster or an electromechanical power steering system. According to the disclosure, a helical coil with a flat, square-threaded annular cross-section is arranged on a thin-walled pipe, the pipe being formed onto a root region of the helical coil by the application of high pressure from the inside of the pipe.

First claim

The invention claimed is:

1. A roller screw drive comprising:
a spindle including at least one coil and a tube which is integrally formed on a root region of the at least one coil by hydroforming from the inside of the tube,
wherein the roller screw drive has at least one drive roller which rolls on the coil,
wherein the at least one drive roller is rotatably mounted in a ring which coaxially surrounds the spindle, and
wherein the ring has at least three centering rollers, which are arranged distributed over the circumference thereof and roll on a circumference of the spindle.

2. The roller screw drive as claimed in claim 1 , wherein the roller screw drive has three drive rollers.

3. The roller screw drive as claimed in claim 1 , further comprising:
a metal bellows configured as an axial spring that is configured to secure the roller screw drive against rotation.

4. The roller screw drive as claimed in claim 1 , wherein:
the roller screw drive is included in an electromechanical brake booster,
the electromechanical brake booster further includes an electric motor, and
the roller screw drive can be driven with the electric motor.

5. The roller screw drive as claimed in claim 1 , wherein:
the roller screw drive is included in a steering gear for an electromechanical power steering system, which further includes an electric motor for driving the steering gear,
the roller screw drive is configured to be driven with the electric motor.

6. A roller screw drive comprising:
a spindle including:
at least one coil; and
a tube which is integrally formed on a root region of the at least one coil by a hydroforming process, the tube having helically circumferential beads formed via the hydroforming process on each side of the coil in the root region; and

at least one drive roller configured to roll on the coil, wherein:
the at least one drive roller is rotatably mounted in a ring which coaxially surrounds the spindle, and
the ring has at least three centering rollers, which are arranged distributed over the circumference thereof and roll on a circumference of the spindle.

7. The roller screw drive as claimed in claim 6 , the tube further having a thin-walled structure.

8. The roller screw drive as claimed in claim 6 , wherein the tube at least partially laterally encompasses the coil in order to form a positive locking relationship between the tube and the coil in an axial direction.

9. The roller screw drive as claimed in claim 6 , wherein the roller screw drive has three drive rollers.

Assignees

• Verhagen Armin
• Nagel Willi
• Goetzelmann Bernd
• Bosch Gmbh Robert

Inventors

• Verhagen Armin
• Nagel Willi
• Goetzelmann Bernd

Classifications

• B21D15/10 Primary

  by applying fluid pressure · CPC title

• B21D39/00 Primary

  Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating ({joining mitred profiles B21D53/745; } riveting B21J; uniting components by forging or pressing to form integral members B21K25/00; welding B23K; press-fitting, force-fitting, or shrinking in general B23P11/00, B21D19/00; by adhesives F16B11/00 {; Connections as such F16L, F16B}); Tube expanders · CPC title

• B62D5/0451

  Roller spindle drives · CPC title

• Y10T74/19744

  Rolling element engaging thread · CPC title

• F16H25/2261

  arranged substantially perpendicular to the screw shaft axis · CPC title