SPINDLE ROD FOR A SPINDLE DEVICE AND METHOD FOR MANUFACTURING A SPINDLE ROD FOR A SPINDLE DEVICE

Abstract

A spindle rod for a spindle device includes a threaded rod (2) with a threaded portion (3) extending along a spindle axis (S) and a coupling part (7) for coupling the threaded rod (2) to a drive or a gear of a drive device. The coupling part (7) is integrally connected to a first end (2a) of the threaded rod (2). The coupling part (7) has a connecting portion (7a) provided for connecting the threaded rod (2) at a first end (2a) facing the threaded rod. The connecting portion (7a) has a bead-shaped thickening.

Claims

1. A spindle rod for a spindle device comprising: a threaded rod with a threaded portion extending along a spindle axis; and a coupling part for coupling the threaded rod to a drive or a gear of a drive device, wherein the coupling part is integrally connected to a first end of the threaded rod, wherein the coupling part has a connecting portion provided for connecting the threaded rod at a first end facing the threaded rod, wherein the connecting portion has a bead-shaped thickening.

2. The spindle rod according to claim 1, wherein the coupling part is a cold extrusion part made of a metal or a metal alloy.

3. The spindle rod according to claim 1, wherein the coupling part is connected to the first end of the threaded rod by welding.

4. The spindle rod according to claim 3, wherein the welding is friction welding

5. The spindle rod according to claim 1, wherein a radially circumferential groove is limited in one side by the bead-shaped thickening.

6. The spindle rod according to claim 5, further comprising a sealing element pressed into the radially circumferential groove delimited on one side by the connecting portion.

7. A spindle device for a drive device comprising a threaded rod with a threaded portion extending along a spindle axis; a spindle nut, wherein the spindle nut is in threaded engagement with the threaded portion of the threaded rod; a bearing device configured for rotatable mounting of the threaded rod, a coupling part for coupling the threaded rod to a drive or a gear of a drive device, wherein the bearing device comprises a bearing element with the bearing element radially revolving around the coupling part and being axially secured on the coupling part, and wherein the coupling part is integrally connected to a first axial end of the threaded rod to form a spindle rod that is rotatably mounted via the bearing device, and wherein the bearing element is axially secured to the coupling part by the bearing element being clamped between an elastic sealing element and an annular projection protruding radially from an outer circumference of the coupling part.

8. The spindle device according to claim 7, further comprising a stop part arranged at a second axial end of the threaded rod opposite the first axial end.

9. The spindle device according to claim 8, wherein the stop part is connected to the second end of the threaded rod by a weld.

10. The spindle device according to claim 9, wherein the weld is a friction weld.

11. A method for manufacturing a spindle rod for a spindle device, comprising the steps of providing a threaded rod with a threaded portion extending along a spindle axis; providing a coupling part for coupling the threaded rod to a drive of a drive device; providing a stop part; concentrically aligning the coupling part and the stop part to the spindle axis defined by the threaded rod; friction welding the coupling part to a first axial end of the threaded rod; and friction welding the stop part to a second axial end of the threaded rod to form a spindle rod.

12. The method according to claim 11, wherein the friction welding of the coupling part to the first axial end of the threaded rod and the friction welding of the stop part to the second axial end of the threaded rod take place simultaneously or at least immediately one after another.

Description

BRIEF SUMMARY OF THE DRAWINGS

[0017] The present disclosure will be explained in more detail below with reference to the accompanying drawings based on a preferred embodiment of the present disclosure.

[0018] FIG. 1 is an illustration of a preferred embodiment of a spindle device according to the present disclosure with a spindle rod according to the present disclosure in a cross-sectional view.

[0019] FIG. 2 provides an enlarged view of the spindle device from FIG. 1 in the region of the coupling part.

DETAILED DESCRIPTION

[0020] FIG. 1 depicts a preferred embodiment of a spindle device 1 according to the present disclosure in a cross-sectional view. The spindle device 1 comprises a threaded rod 2 with a threaded portion 3 in which an external thread 4 is provided. In the exemplary embodiment shown here, the external thread 4 of the threaded portion 3 extends along a spindle axis S defined by the threaded rod 2 over the entire length of the threaded rod 2. Such threaded rods can advantageously be manufactured in excess length and shortened to the required length.

[0021] The spindle device 1 further comprises a spindle nut 5 with an internal thread 6, the internal thread 6 meshing with the external thread 4 of the threaded rod 2. The spindle nut 5 is accordingly advantageously in threaded engagement with the threaded rod 2 so that the spindle nut 5 can be axially displaced along the spindle axis S by rotating the threaded rod 2. The spindle device is advantageously suitable for use in a drive device for generating a linear drive movement.

[0022] A coupling part 7 is arranged at a first end 2a of the threaded rod 2. The coupling part 7 is designed as a cold extrusion part and has a connecting portion 7a which faces the first end 2a of the threaded rod 2 and which is designed as a thickening. The thickened connecting portion 7a delimits an annular groove 7b. The coupling part 7 is advantageously arranged rotationally symmetrical on the spindle axis S at the first end 2a of the threaded rod 2 so that the coupling part 7 is designed as an axial extension of the threaded rod 2. The coupling part 7 is particularly advantageously provided such that the threaded rod 2 can be coupled to an output shaft of a drive or a gear of a drive device.

[0023] The coupling part 7 is integrally connected to the first end 2a of the threaded rod 2 at the connecting portion 7 via a friction weld. The connecting portion 7a is advantageously designed as a weld bead that forms during the welding process. The coupling part 7, together with the threaded rod 2, thus forms a spindle rod 8 according to the present disclosure, which is designed to be rotationally driven by an output shaft of a drive device. For this purpose, the coupling part 7 has, at the end facing away from the threaded rod 2, a serration 7c, which is designed as a drive device for the rotationally locked connection to an output shaft. This way, a connection of the spindle rod 8 to an output shaft of a drive device can advantageously be established.

[0024] The spindle device 1 further comprises a bearing device 9 with an annular bearing element 10 designed as a ball bearing. The bearing element 10 revolves radially around the coupling part 7 and is axially secured to the coupling part 7 by the bearing element 10 being clamped between an elastic sealing element 11 and an annular projection 7d protruding radially from an outer circumference of the coupling part 7. The sealing element 11 is axially arranged between the bearing element 10 and the connecting portion 7a at the end of the coupling part 7 facing the threaded rod 2. The sealing element 11 is annular and is pressed into the groove 7b provided on the coupling part 7. The groove 7b is created by the friction welding since the friction welding creates the connecting portion 7a, which is designed as a weld bead and delimits the groove 7b on one side. The sealing element 11 can advantageously first be slipped onto the end of the coupling part 7 provided for the connection to the threaded rod 2 and then axially secured by the friction weld. To further secure the bearing element 10, an annular securing element 12 is pushed onto the sealing element 11.

[0025] At a second end 2b of the threaded rod 2 opposite the first end 2a, a stop part 13 is arranged, which serves to limit the axial displacement of the spindle nut 5. The stop part 13, like the coupling part 7, is connected to the second end 2b of the threaded rod 2 by friction welding. The stop part 13 has a central connecting portion 13a and a wall portion 13b which revolves radially around the connecting portion 13a.

[0026] The stop part 13, like the coupling part 7, is advantageously concentrically arranged about the spindle axis S so that an annular stop surface 14 is present, which is formed by an end face of the hollow cylindrical wall portion 13b facing the threaded rod 2. The central connecting portion 13a is also arranged concentrically to the spindle axis S and is T-shaped in a cross section due to the welding bead formed by friction welding. The connecting portion 13a serves to connect the stop part 13 to the second end 2b of the threaded rod 2.

[0027] Since the coupling part 7 and the stop part 13 are arranged opposite one another at the first end 2a and the second end 2b of the threaded rod 2 and both are connected to the threaded rod 2 by friction welding, it is advantageously possible to integrally connect the coupling part 7 and the stop part 13 to the treaded rod 2 in a single manufacturing step by friction welding. For this purpose, the coupling part 7 and the stop part 13 are initially aligned concentrically with respect to the spindle axis S and then moved axially in the direction of the first end 2a and the second end 2b of the threaded rod 2 with a relative rotary movement about the spindle axis S and thus simultaneously connected to the threaded rod 2 by friction welding. The production process is advantageously designed to be particularly time-saving and material-saving.

[0028] FIG. 2 shows an enlarged view of the spindle device from FIG. 1 in the region of the coupling part 7. In this view, it can clearly be seen that the connecting portion 7a is designed as a weld bead, which was created by friction welding when the coupling part 7 was connected to the first end 2a of the threaded rod 2. It can also be seen that the sealing element 11 is pressed into the groove 7b delimited on one side by the connecting portion and is correspondingly axially secured. The securing element 12 is pushed onto the sealing element 11 and axially secured by a collar 11a of the sealing element protruding radially outward.

[0029] The present disclosure was explained above on the basis of an embodiment in which the bearing element 10 is axially secured on the coupling part 7. It goes without saying that the bearing element can also be arranged and secured on the threaded rod. cm What is claimed is: