threaded spindle

Abstract

Threaded spindle with a working thread (2) and with a bearing section (8) on which at least one radial bearing (10) is provided, wherein the working thread (2) and the bearing section (8) are arranged concentrically to a longitudinal axis of the threaded spindle (1), and wherein a clamping nut threaded section (14) is provided on the side of the bearing section (8) facing away from the working thread (2), on which a first clamping nut (12) can be mounted, with which the at least one radial bearing (10) can be preloaded axially against an axial stop (16, 26) fixed to the threaded spindle on the working thread (2), wherein the axial stop (16, 26) is formed by a threaded ring (6, 22) which is arranged on a stop threaded section (4) which is formed between the working thread (2) and the bearing section (8), characterized in that the threaded ring (6, 22) is configured as a second clamping nut (6, 22). and has a threaded ring part (6a) and a clamping ring (6b),which can be tightened using screws (20,24).

Description

Field of invention

[0001] The invention relates to a threaded spindle according to the preamble of claim 1. Background of the invention

[0002] Threaded spindles typically have a bearing seat next to their working thread. A bearing assembly is preloaded onto this seat by means of a clamping nut against an axial stop located on the working thread side. Currently, the bearing seat on rolled threaded spindles is either machined or attached to the spindle by friction welding. Machining requires relatively small bearing seat diameters to ensure a sufficiently large axial contact area for the bearing assembly. This, however, limits the maximum drive torque. While sufficiently large bearing seat diameters can be achieved with friction welding, this method is very time-consuming and expensive. It requires more machining operations and more complex processes, and usually necessitates the removal of a portion of the welded blank, rendering it unusable.This increases costs. Upsetting forging is another option, but it offers little price advantage over friction welding. Shrink-fitting a counter-ring would also be possible in principle. However, this requires interrupting production for the shrink-fitting process, which also results in higher costs.

[0003] The document EP 0 965 768 B1 describes a clamping nut with a threaded ring and clamping elements that can be clamped against it.

[0004] DE 20 2008 009 033 U1 shows a threaded spindle. Disclosure of the invention

[0005] In contrast, the invention is based on the objective of creating a threaded spindle that can absorb large moments while being easy to manufacture.

[0006] This problem is solved by a threaded spindle according to the features of claim 1.

[0007] Advantageous further developments of the invention are the subject of the dependent claims.

[0008] According to the invention, a threaded spindle of the generic type is provided, wherein an axial stop for axially bearing, for example, a radial bearing inner ring against a working thread or at least on the working thread side of a threaded ring or bearing ring can be formed, which can be arranged on a stop threaded section. The stop threaded section can be formed between the working thread and a bearing section of the threaded spindle.

[0009] This solution has the advantage that, compared to the prior art, no step is required between the working thread and the bearing section. This allows for a larger bearing section diameter, enabling a higher drive torque for the threaded spindle. The simple design allows for cost-effective manufacturing of the threaded spindle. A prefabricated part can be used for the required retaining ring, further reducing manufacturing costs.

[0010] The threaded ring or retaining ring is designed as a clamping nut. For example, a design as described in document EP 0 965 768 B1 is possible. This allows the threaded ring or retaining ring to be advantageously clamped onto the threaded spindle, thus fixing its position along a longitudinal axis of the threaded spindle.

[0011] The radial bearing can be designed as a radial rolling bearing. These are inexpensive to manufacture or procure and easy to install using appropriate fixtures.

[0012] The working thread can advantageously be produced by a thread rolling process, which allows a thread to be quickly and cost-effectively introduced into a rod-like component.

[0013] The bearing seat and / or a clamping nut thread section may be produced by machining.

[0014] The clamping nut can include a threaded ring. Furthermore, the clamping nut can include a clamping ring. The threaded ring and the clamping ring can be integrally connected. The clamping ring can be divided into several segments, which can be bent separately.

[0015] The outer diameter of the stop thread section can be smaller than or equal to the core diameter of the working thread. The diameter of the bearing seat can be smaller than or equal to the core diameter of the stop thread section. The diameter of the clamping nut thread section can be smaller than or equal to the diameter of the bearing seat. This allows, either individually or synergistically, the bearing seat diameter to be advantageously larger compared to the prior art.

[0016] A drive pin can be provided at one end of the threaded spindle, opposite the working thread. The diameter of the drive pin can be less than or equal to the core diameter of the clamping nut thread section.

[0017] The threads on the clamping nut thread section and / or the stop thread section and / or the working thread can preferably each be designed as a pointed thread. This design makes the thread self-locking. No additional thread-locking compound is required.

[0018] The working thread can be designed in such a way that it is prepared for screw engagement with a rolling element nut or with a planetary nut. Brief description of the drawings

[0019] Preferred embodiments of the invention are explained in more detail below with reference to schematic drawings. These show: Fig. 1a in a longitudinal section a threaded spindle with a threaded ring according to an exemplary embodiment, Fig. 1b in a longitudinal section the threaded spindle with a further threaded ring according to the embodiment, Fig. 2 in a perspective cross-sectional view of the threaded ring made of Fig. 1a and Fig. 3 in a perspective view a first clamping nut. Detailed description of preferred embodiments

[0020] Fig. Figure 1a shows the threaded spindle 1 with a working thread 2 extending from one end of the threaded spindle 1. A stop threaded section 4 is provided adjacent to the working thread 2, on which a threaded ring 6 is mounted. A bearing seat 8 adjoins the stop threaded section 4, supporting four rolling bearings 10. The rolling bearings 10 are axially preloaded against a stop 16 on the threaded ring 6 by a first clamping nut 12, which is mounted on a clamping nut threaded section 14. A drive pin 18 adjoins the clamping nut threaded section 14 axially. The threaded ring 6 has a shape that is described in Fig. Figure 3 shows this in more detail. Screws 20 are provided, which are mounted in the threaded ring 6 on the working thread side.

[0021] Fig. Figure 1b shows the threaded spindle 1 as already shown in Fig. Figure 1a shows the designation. The reference numerals therefore remain valid. The threaded ring 22 is different. Here, it has screws 24 which are inserted into the threaded ring 22 on the bearing seat side. The first clamping nut 12 clamps the rolling bearings 10 against a stop 26. The stop 26 differs from the stop 16 of the first embodiment, for example, by the recesses formed for receiving the screws 24.

[0022] Fig. Figure 2 shows the hollow cylindrical threaded ring 6, as already described in Fig. Figure 1a shows the threaded ring 6 in detail. This ring can be mounted using the screws 20. A thread (not shown) is provided on the inner surface 28. At one end, opposite the heads of the screws 20, the threaded ring 6 has a right-angled shoulder 30, to which a radially narrower hollow cylinder section 32 adjoins. This section has a stop 16 on its end face. The threaded ring 6 is designed as a clamping nut and has a threaded ring part 6a and a clamping ring 6b, which can be tightened using the screws 20.

[0023] Fig. Figure 3 shows the first clamping nut 12, as used to clamp the rolling bearings 10. It is hollow cylindrical and designed with an internal thread (not shown). Clamping elements 36 can be tightened against a threaded ring 38 by means of screws 34.

[0024] A threaded spindle with a working thread and a bearing section is disclosed, wherein bearings on the bearing section are preloaded against a bearing ring by means of a nut, which is arranged on a threaded section between the bearing section and the working thread. Reference symbol list: 1 threaded spindle 2 working threads 4 Stop threaded section 6 threaded ring / second clamping nut 6a Threaded ring part 6b Clamping ring 8 Bearing section / bearing seat 10 rolling bearings / radial bearings 12 first clamping nut 14 Clamping nut thread section 16 attacks 18 drive pins 20 screws 22 Threaded ring / second clamping nut 24 screws 26 attacks 28 Inside Paragraph 30 32 Hollow cylinder section 34 screw 36 clamping element 38 threaded ring

Claims

[1] Threaded spindle with a working thread (2) and with a bearing section (8) on which at least one radial bearing (10) is provided, wherein the working thread (2) and the bearing section (8) are arranged concentrically to a longitudinal axis of the threaded spindle (1), and wherein a clamping nut threaded section (14) is provided on the side of the bearing section (8) facing away from the working thread (2), on which a first clamping nut (12) can be mounted, with which the at least one radial bearing (10) can be preloaded axially against an axial stop (16, 26) fixed to the threaded spindle on the working thread (2), wherein the axial stop (16, 26) is formed by a threaded ring (6, 22) which is arranged on a stop threaded section (4) which is formed between the working thread (2) and the bearing section (8), characterized bythat the threaded ring (6,22) is designed as a second clamping nut (6,22) and has a threaded ring part (6a) and a clamping ring (6b) which can be clamped using screws (20,24). [2] Threaded spindle according to claim 1, wherein the threaded ring (6,22) is formed by the second clamping nut (6,22) which can be preloaded at a certain axial position on the threaded spindle (1). [3] Threaded spindle according to claim 1 or 2, wherein the radial bearing (10) is designed as a radial rolling bearing. [4] Threaded spindle according to one of claims 1 to 3, wherein the working thread (2) is produced by a thread rolling process. [5] Threaded spindle according to one of claims 1 to 4, wherein the bearing section (8) and / or the clamping nut threaded section (14) are produced by machining. [6] Threaded spindle according to one of claims 1 to 5, wherein the first clamping nut (12) comprises a clamping ring. [7] Threaded spindle according to claim 6, wherein the clamping ring is divided into several segments. [8] Threaded spindle according to any one of claims 1 to 7, wherein an outer diameter of the stop thread section (4) is less than or equal to the core diameter of the working thread (2). [9] Threaded spindle according to any one of claims 1 to 8, wherein the diameter of the bearing section (8) is less than or equal to the core diameter of the stop threaded section (4). [10] Threaded spindle according to any one of claims 1 to 9, wherein the diameter of the clamping nut thread section (14) is less than or equal to the diameter of the bearing section (8). [11] Threaded spindle according to one of claims 1 to 10, wherein a drive pin (18) is provided at one end of the threaded spindle (1) adjacent to the clamping nut thread section (14). [12] Threaded spindle according to claim 11, wherein a diameter of the drive pin (18) is less than or equal to the core diameter of the clamping nut thread section (14). [13] Threaded spindle according to any one of claims 1 to 12, wherein at least one of the threads or all threads are designed as pointed threads.

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