BALL SCREW WITH CIRCUMFERENTIAL STOP

• US 20120090418A1
• Filed: 07/19/2010
• Published: 04/19/2012
• Est. Priority Date: 08/10/2009
• Status: Abandoned Application

• Current Assignee: Schaeffler Technologies AG & Co.KG (INA-Holding Schaeffler GmbH & Co. KG)
• Original Assignee: Schaeffler Technologies GmbH & Co. KG (INA-Holding Schaeffler GmbH & Co. KG)
• Inventors: Barthlein, Stefanie, Kraus, Manfred, Miko, Josef, Osterlanger, Jurgen
• Application Number:
  US13/377,333
• Publication Number:
  US 20120090418A1
• Time in Patent Office: Days
• US Class Current: 74/424.81
• CPC Class Codes: F16D 2121/14 Mechanical
• CPC Class Codes: F16D 2125/40 Screw-and-nut
• CPC Class Codes: F16D 65/18 adapted for drawing members together , e.g. for disc brakes
• CPC Class Codes: F16H 25/2015 Means specially adapted for stopping actuators in the end position; Position sensing means
• CPC Class Codes: F16H 25/2204 with balls
• CPC Class Codes: Y10T 74/19744 Rolling element engaging thread

Abstract

A ball screw (7, 24), having a threaded nut (10, 26) which is arranged on a threaded spindle (8, 28) and having a stop (43) for the circumferential abutment of the threaded nut (10, 26) in its stop position provided on the threaded spindle (8, 28), wherein the stop (43) has a first stop surface (47) assigned to the threaded nut (10, 26) and has a second stop surface (48) which is provided for abutting against the first stop surface (47) and which is assigned to the threaded spindle (8, 28), and, in the stop position, an axial overlap of the first stop surface (47) with the second stop surface (48) is provided, which overlap amounts to between 20% and 85% of the pitch of the threaded spindle (8, 28).

Claims

1. A ball screw comprising a threaded nut which is arranged on a threaded spindle and having a stop for circumferential abutment of the threaded nut in a stop position, wherein the stop has a first stop surface assigned to the threaded nut and has a second stop surface which is provided for abutting against the first stop surface and which is assigned to the threaded spindle, and in the stop position, an axial overlap of the first stop surface with the second stop surface is provided, and the axial overlap amounts to between 20% and 85% of a pitch of the threaded spindle.

2. The ball screw as claimed in claim 1, wherein the second stop surface is formed on an axial projection of a stop part arranged on the threaded spindle, wherein the axial overlap is formed from an axial extent of the projection minus an axial minimum spacing between the stop and the threaded nut.

3. The ball screw as claimed in claim 2, wherein the minimum spacing in the stop position is between 3/10 mm and 1 mm.

4. The ball screw as claimed in claim 2, wherein an axial extent of the projection is at most as large as the pitch of the threaded spindle.

5. The ball screw as claimed in claim 2, wherein the threaded nut is provided, on an end side facing thereof toward the stop, with a recess for the projection, which recess is open at the end side.

6. The ball screw as claimed in claim 1, wherein, in the stop position, the first stop surface and the second stop surface are arranged at least substantially in a common plane which contains an axis of the threaded spindle.

7. The ball screw as claimed in claim 5, wherein the recess extends in a circumferential direction at least over an angle formed from a quotient of a ratio of the axial overlap to the pitch of the threaded spindle, multiplied by 360 degrees, wherein the axial overlap and the pitch of the threaded spindle are both designated using a same unit of length.