Ball screw mechanism

• US 20060037419A1
• Filed: 08/19/2005
• Published: 02/23/2006
• Est. Priority Date: 08/20/2004
• Status: Active Grant

• Current Assignee: Schaeffler Technologies AG & Co.KG (INA-Holding Schaeffler GmbH & Co. KG)
• Original Assignee: Ins- Schaeffler AG
• Inventors: Adler, Dieter, Mayer, Ralf, Osterlanger, Jurgen, Kraus, Manfred
• Granted Patent: US 7,628,088 B2
• Time in Patent Office: Days
• US Class Current: 74/89
• CPC Class Codes: F16H 2025/2445 Supports or other means for compensating misalignment or offset between screw and nut
• CPC Class Codes: F16H 25/2204 with balls
• CPC Class Codes: F16H 25/24 Elements essential to such mechanisms, e.g. screws, nuts F16H25/22 takes precedence
• CPC Class Codes: Y10T 74/18568 Reciprocating or oscillating to or from alternating rotary
• CPC Class Codes: Y10T 74/18576 including screw and nut
• CPC Class Codes: Y10T 74/18656 Carriage surrounded, guided, and primarily supported by member other than screw [e.g., linear guide, etc.]
• CPC Class Codes: Y10T 74/19744 Rolling element engaging thread

Abstract

Ball screw mechanism, with a spindle nut (1) which is arranged rotatably on a ball-rolling spindle (2) and between which and the ball-rolling spindle (2) balls (3) roll on ball grooves (4, 5), and with a driving wheel (20, 26), connected fixedly in terms of rotation to the spindle nut (1), for driving the spindle nut (1), the spindle nut (1) being capable of being mounted on a housing (8) by means of a bearing, in particular a rolling bearing (7), the bearing having an outer ring (9, 23) capable of being fixed to the housing (8), the outer ring (9, 23) having a ring (15, 29) surrounding the spindle nut (1), and with a bearing running surface (10, 11) formed on the inner circumference of said ring, and a radial flange (16, 28) adjoining the ring (15, 29), the radial flange (16, 28) being capable of being fixed to the housing (8).

Claims

1. Ball screw mechanism, with a spindle nut (1) which is arranged rotatably on a ball-rolling spindle (2) and between which and the ball-rolling spindle (2) balls (3) roll on ball grooves (4, 5), and with a driving wheel (20, 26), connected fixedly in terms of rotation to the spindle nut (1), for driving the spindle nut (1), the spindle nut (1) being capable of being mounted on a housing (8) by means of a bearing, in particular a rolling bearing (7), the bearing having an outer ring (9, 23) capable of being fixed to the housing (8), characterized in that the outer ring (9, 23) has a ring (15, 29) surrounding the spindle nut (1), and with a bearing running surface (10, 11) formed on the inner circumference of said ring, and a radial flange (16, 28) adjoining the ring (15, 29), the radial flange (16, 28) being capable of being fixed to the housing (8).

2. Ball screw mechanism according to claim 1, in which the outer ring (9, 23) has an L-shaped form, as seen in longitudinal section, the radial flange (16, 28) adjoining an axial end of the ring (15, 29).

3. Ball screw mechanism according to claim 1, in which the radial flange (16, 28) is integrally formed in one piece onto the ring (15, 29).

4. Ball screw mechanism according to claim 1, in which the outer ring (9, 23) is formed from sheet metal in a forming method, in particular by deep drawing.

5. Ball screw mechanism according to claim 1, in which the radial flange (16, 28) is arranged so as to be axially offset with respect to the bearing running surface (10, 11).

6. Ball screw mechanism according to claim 1, in which the bearing running surface (10, 11) is arranged axially within the driving wheel (26).

7. Ball screw mechanism according to claim 6, in which a force acting on the driving wheel is arranged in a common plane with the bearing running surface.

8. Ball screw mechanism according to claim 1, in which the spindle nut (1) is provided on its outer circumference with a bearing running surface (11) which is integrally formed in one piece and which cooperates with the bearing running surface (10) of the outer ring (9), preferably with rolling bodies rolling on the bearing running surfaces (10, 11) being interposed.

9. Ball screw mechanism according to claim 1, in which the radial flange (28) has an outside diameter which is larger than the outside diameter of the driving wheel (24).

10. Ball screw mechanism according to claim 1, in which the radial flange (28) is designed to be elastically deformable in such a way that, with the edge (30) of the radial flange (28) being clamped, tilting movements of the outer ring (23) about the spindle axis are possible.

11. Ball screw mechanism according to claim 1, in which the radial flange (28) can be fixed to the housing (8), with an element (33) insulating solid-borne sound being interposed, without metallic contact between the radial flange (28) and the housing (8).