Ball screw

• US 10,641,370 B2
• Filed: 09/03/2015
• Issued: 05/05/2020
• Est. Priority Date: 09/24/2014
• Status: Active Grant

• Current Assignee: Schaeffler Technologies AG & Co.KG (INA-Holding Schaeffler GmbH & Co. KG)
• Original Assignee: Schaeffler Technologies AG & Co.KG (INA-Holding Schaeffler GmbH & Co. KG)
• Inventors: Kreutzer, Mario, Baier, Richard, Oswald, Markus, Adler, Dieter
• Primary Examiner(s): Sanders, Howard J
• Assistant Examiner(s): Prather, Gregory T
• Application Number:
  US15/513,016
• Publication Number:
  US 20170299028A1
• Time in Patent Office: 1,706 Days
• CPC Class Codes: B60T 13/746 and mechanical transmission of the braking action
• CPC Class Codes: F16D 2121/24 using motors
• CPC Class Codes: F16D 2125/36 Helical cams, Ball-rotating ramps
• 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 2025/204 Axial sliding means, i.e. for rotary support and axial guiding of nut or screw shaft
• CPC Class Codes: F16H 2025/2481 Special features for facilitating the manufacturing of spindles, nuts, or sleeves of screw devices
• CPC Class Codes: F16H 25/2015 Means specially adapted for stopping actuators in the end position; Position sensing means
• CPC Class Codes: F16H 25/2223 Cross over deflectors between adjacent thread turns, e.g. S-form deflectors connecting neighbouring threads
• CPC Class Codes: F16H 25/2454 Brakes; Rotational locks

Abstract

The invention relates to a ball screw including a spindle nut arranged on a lead screw, and balls, which roll on ball grooves of the spindle nut and of the lead screw, and a circumferential stop on the screw side and a circumferential stop on the nut side, the spindle nut being arranged in a sleeve surrounding the ball nut, the sleeve is formed from sheet metal by shaping and the nut-side circumferential stop is formed integrally on the sleeve.

Claims

1. A ball screw comprising:

a spindle nut arranged on a threaded spindle,

balls that roll on ball grooves of the spindle nut and the threaded spindle,

a spindle-side circumferential stop, and

a nut-side circumferential stop formed on a first axial end of a sleeve,

the spindle nut is arranged in the sleeve that surrounds the spindle nut and is formed from sheet metal by shaping, and

the nut-side circumferential stop and a rotational lock are formed integrally on the sleeve, and the rotational lock is formed on a second axial end of the sleeve opposite from the first axial end,

the sleeve is provided with a radial flange with a recess for leading through the spindle-side circumferential stop,

the recess and the nut-side circumferential stop have, in a circumferential direction, a predetermined distance to each other that is greater than zero, for determining a rotational position of the sleeve and the spindle nut in an aligned position of the spindle-side circumferential stop and the recess relative to each other.

2. The ball screw according to claim 1, wherein the rotational lock is formed by a hollow bump formed on the sleeve that projects radially from a cylindrical circumferential surface of the sleeve.

3. The ball screw according to claim 1, wherein the nut-side circumferential stop is formed on an end-side radial flange of the sleeve, and the end-side radial flange is provided with a step on which a stop surface of the nut-side circumferential stop is formed.

4. The ball screw according to claim 3, wherein the radial flange is arranged in a helical shape about a spindle axis of the threaded spindle, and the step is formed by an axial offset of the radial flange.

5. The ball screw according to claim 1, wherein the sleeve has, on one end side thereof, a radially inward directed crescent-shaped projection that extends in a circumferential direction from a radially tapered end to a radially expanded end, and a stop surface of the nut-side circumferential stop is formed on the radially expanded end.

6. The ball screw according to claim 1, wherein the balls are arranged in a screw-shaped ball channel wound about a spindle axis, a start and an end of the ball channel are connected to each other by a deflection body in an endless manner, and the sleeve surrounds the deflection body and is held captively on the spindle nut.

7. The ball screw according to claim 1, wherein the sleeve is connected to the spindle nut by at least one of a friction-fit connection or by a positive-locking connection for transmitting torques.

8. A method for installing the ball screw according to claim 1, comprising the following steps:

mounting the spindle nut and the threaded spindle with the balls;

setting up an aligned position of the sleeve and the spindle-side circumferential stop in which the recess and the spindle-side circumferential stop are aligned with each other; and

in this aligned position, arranging the sleeve locked in rotation on the spindle nut.

9. A braking device of a motor vehicle with a ball screw according to claim 1.