SCREW MECHANISM PART OF A SCREW MECHANISM AND METHOD FOR THE PRODUCTION THEREOF

Abstract

A screw mechanism part (1) of a screw mechanism, which screw mechanism part is formed by a lead screw or a threaded nut (15) of the screw mechanism, has a machine part (3), which is mounted in a rotationally fixed manner on the screw mechanism part (1), for transmitting a torque. The machine part (3) and the screw mechanism part (1) have an axial overlap region (a) in which the pressing section (4) formed on the inner circumference of the machine part (3) is pressed onto external teeth or knurling (5) of the screw mechanism part (1). Inside the overlap region (a) there is formed a circumferential groove (6) which is situated axially adjacent to the external teeth or knurling (5). Material of the machine part (3) which is displaced during the pressing on is pushed into the circumferential groove (6).

Claims

1. A screw mechanism part of a screw mechanism, the screw mechanism part being a lead screw or a threaded nut of the screw mechanism, having a machine part which is mounted in a rotationally fixed manner on the screw mechanism part for transmitting a torque, the machine part and the screw mechanism part having an axial overlap region in which a pressing section formed on an inner circumference of the machine part is pressed onto external teeth or knurling of the screw mechanism part, wherein, inside the overlap region, there is formed a circumferential groove which is situated axially adjacent to the external teeth or knurling.

2. The screw mechanism part according to claim 1, wherein the circumferential groove is arranged axially between the external teeth or knurling and a seal formed between the screw mechanism part and the machine part.

3. The screw mechanism part according to claim 1, wherein the circumferential groove is formed on the screw mechanism part and axially adjoins the external teeth or knurling directly.

4. The screw mechanism part according to claim 3, wherein the circumferential groove has a groove base, the groove base having a diameter based on the screw mechanism part axis that is equal to or smaller than a root diameter of the external teeth or knurling.

5. The screw mechanism part according to claim 2, wherein the seal forms an annular sealing gap, which is delimited by a first sealing surface of the screw mechanism part and by a cylindrical second sealing surface of the machine part.

6. The screw mechanism part according to claim 5, wherein the first sealing surface is formed on an annularly closed ring section of the screw mechanism part.

7. The screw mechanism part according to claim 5, wherein the machine part is provided with the second cylindrical sealing surface on its inner circumference at one axial end of the axial overlap region and, at an opposite other axial end of the axial overlap section, with the pressing section.

8. The screw mechanism part according to claim 7, wherein the second cylindrical sealing surface and the pressing section are arranged axially directly adjacent to one another and have diameters of the same size or different sizes.

9. A screw mechanism comprising: the screw mechanism part according to claim 1, which is designed as a rotatably drivable lead screw, on which the threaded nut is arranged in screw engagement.

10. A method for producing a screw mechanism comprising: providing a screw mechanism part, the screw mechanism part being a lead screw or a threaded nut of a screw mechanism; and pressing a machine part onto the screw mechanism part with axial feed, wherein external teeth or knurling of the screw mechanism part displaces material of a pressing section, and wherein any chips of the machine part that may be produced under a relative displacement between the machine part and the screw mechanism part are pressed in a direction of a circumferential groove situated axially adjacent to the external teeth or knurling and brought into the circumferential groove.

11. A screw mechanism comprising: a screw mechanism part, the screw mechanism part being a lead screw or a threaded nut of a screw mechanism; and a machine part mounted in a rotationally fixed manner on the screw mechanism part for transmitting a torque, the machine part and the screw mechanism part have an axial overlap region in which a pressing section formed on an inner circumference of the machine part is pressed onto external teeth or knurling of the screw mechanism part, a circumferential groove being formed inside the overlap region and situated axially adjacent to the external teeth or knurling, the circumference groove being configured for receiving chips formed during pressing of the machine part onto the screw mechanism part.

12. The screw mechanism as recited in claim 11 wherein the machine part is a stop ring.

13. The screw mechanism as recited in claim 12 wherein the circumferential groove is arranged axially between the external teeth or knurling and a seal, the seal being formed within the overlap region by an outer circumferential surface of the screw mechanism part and an inner circumferential surface of the stop ring.

14. The screw mechanism as recited in claim 12 wherein the stop ring including a cam-shaped stop on an outer circumference of the stop ring.

15. The screw mechanism as recited in claim 11 wherein the pressing section of the machine part is formed of a softer material than external teeth or knurling of the screw mechanism part.

16. The screw mechanism as recited in claim 11 wherein the screw mechanism is a ball screw mechanism.

17. The screw mechanism as recited in claim 11 wherein the screw mechanism part is a lead screw, the screw mechanism further comprising the threaded nut arranged on the lead screw as a threaded drive part.

Description

DETAILED DESCRIPTION

[0030] FIGS. 1 to 4 show a screw mechanism with a screw mechanism part 1 which is formed by a lead screw 2. A machine part 3 for transmitting a torque is arranged in a rotationally fixed manner on the screw mechanism part 1. The machine part 3 and the screw mechanism part 1 have an axial overlap region (a) in which the pressing section 4 formed on the inner circumference of the machine part 3 is pressed onto the knurling 5 of the screw mechanism part 1. Inside the overlap region (a) there is formed a circumferential groove 6 which is situated axially adjacent to the knurling 5.

[0031] The circumferential groove 6 is arranged axially between the knurling 5 and a seal 7 formed between the screw mechanism part 1 and the machine part 3. The circumferential groove 6 is formed on the screw mechanism part 1 and axially adjoins the knurling 5 directly. A groove base 8 of the circular circumferential groove 6 has a diameter related to the screw mechanism part axis which is equal to or smaller than a root diameter 9 of the knurling 5.

[0032] The seal 7 forms an annular sealing gap 10, which is delimited by a first sealing surface 11 of the screw mechanism part 1 and by a cylindrical second sealing surface 12 of the machine part 3. The first sealing surface 11 is formed on an annularly closed ring section 13 of the screw mechanism part 1, which can also be referred to as a bead.

[0033] The machine part 3 designed as a stop ring 16 is provided with the second cylindrical sealing surface 12 on its inner circumference at one axial end of the axial overlap section (a), and, at the opposite other axial end of the axial overlap section (a), with the cylindrical pressing section 4. The second cylindrical sealing surface 12 and the cylindrical pressing section 4 are arranged axially directly adjacent to one another and have diameters of different sizes. The second cylindrical sealing surface 12 and the cylindrical pressing section 4 can alternatively lie on a common diameter.

[0034] On the outer circumference of the stop ring 16, a cam-shaped stop 17 is formed for the circumferential stop against a counter-stop, which is arranged on a threaded nut, not shown, or on a machine part connected in a rotationally fixed manner to the threaded nut.

[0035] The lead screw 2 with the knurling 5 is made of a steel hardened in a heat treatment and the machine part 3 with the pressing section 4 is made of a comparatively soft material. When the machine part 3 is pressed onto the knurling 5, the material of the pressing section 4 is plastically deformed and pushed in the direction of the circumferential groove. Any chips of the machine part 3 that may be produced are forced towards and into the circumferential groove 6 under the relative displacement between the machine part 3 and the lead screw 2. The chips are received in the circumferential groove 6 in a captive manner. In the sliding direction of the machine part 3, the circumferential groove 6 is located in front of the knurling 5. Chips produced preferably do not reach the axial side of the knurling 5 facing away from the seal 7.

[0036] FIG. 5 shows a screw mechanism designed as a ball screw mechanism with the machine part 3 pressed onto the lead screw 2, which is designed here as a stop disk 18. A threaded nut 15 is arranged on the lead screw 2 as a threaded drive part 14. A ball groove 19 wound helically around the spindle axis can be clearly seen on which balls, not shown, roll off, which are arranged between the lead screw 2 and the threaded nut 15. The connection in a rotationally fixed manner between the stop disk 18 and the lead screw 2 is implemented in the same way as in the embodiment described above.

LIST OF REFERENCE SYMBOLS

[0037] Screw mechanism part [0038] Lead screw [0039] Machine part [0040] Pressing section [0041] Knurling [0042] Circumferential groove [0043] Seal [0044] Groove base [0045] Root diameter [0046] Sealing gap [0047] First sealing surface [0048] Second sealing surface [0049] Ring section [0050] Screw mechanism part [0051] Threaded nut [0052] Stop ring [0053] Stop [0054] Stop disk [0055] Ball groove