Shaft guidance system, rotor, vehicle and process

The shaft guidance system with prestressed bearings and coated, counter-rotating bushings addresses the complexity of shaft bearing mounting, achieving stable and low-friction rotation in rotating machines.

DE102024200739A1Pending Publication Date: 2025-07-31ZF FRIEDRICHSHAFEN AG

Patent Information

Application Number
DE102024200739
Authority / Receiving Office
DE · DE
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-01-29
Publication Date
2025-07-31

AI Technical Summary

Technical Problem

The mounting of shaft bearings in a rotor is complicated and affects the stability and reliability of rotating machines, requiring an improved wave guide system for precise and low-friction rotation.

Method used

A shaft guidance system with a first and second shaft bearing, where a prestressing element produces prestress on both bearings via the shaft, simplifying the construction of the second shaft bearing and potentially using a ring spring for increased rotor natural frequency and bearing rigidity, along with bearing bushes having counter-rotating threads and coatings for improved durability and noise reduction.

Benefits of technology

The system ensures precise, smooth, and low-friction rotation, enhances bearing stability and rigidity, and reduces assembly complexity while minimizing friction and noise.

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Abstract

A shaft guidance system is proposed. The shaft guidance system comprises a shaft, a first shaft bearing, and a second shaft bearing. The first shaft bearing is arranged at a first end of the shaft. The first shaft bearing comprises a preload element. The preload element is designed to preload the first shaft bearing. The second shaft bearing is arranged at a second end of the shaft, opposite the first end. The first shaft bearing and the second shaft bearing are arranged on the shaft in such a way that the preload element of the first shaft bearing creates a preload via the shaft onto the second shaft bearing.
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Claims

[1] A waveguide system (100) comprising a wave (110), a first shaft bearing (120), wherein the first shaft bearing (120) is arranged at a first end (112) of the shaft (110), wherein the first shaft bearing (120) comprises a preload element (122), the preload element (122) is designed to produce a preload of the first shaft bearing (120); and a second shaft bearing (130), wherein the second shaft bearing (130) is arranged at a second end (114) of the shaft (110) opposite the first end (112), and wherein the first shaft bearing (120) and the second shaft bearing (130) are arranged on the shaft (110) such that the preload element (122) of the first shaft bearing (120) produces a preload via the shaft (110) onto the second shaft bearing (130). [2] The shaft guide system (100) according to claim 1, further comprising at least one of a first bearing bush (140) surrounding the first shaft bearing (120) and a second bearing bush (150) surrounding the second shaft bearing (130), wherein the first bearing bush (140) and the second bearing bush (150) are rotationally symmetrical. [3] The waveguide system (100) according to claim 2, comprising the first bearing bushing (140) and the second bearing bushing (150), wherein the first bearing bushing (140) has a first external thread and the second bearing bushing (150) has a second external thread, wherein the first external thread is opposite to the second external thread. [4] The wave guide system (100) according to one of claims 2 or 3, wherein at least the first bearing bush (140) or the second bearing bush (150) is made of a first material and a lateral surface and an end surface of the first bearing bush (140) or the second bearing bush (150) has a coating with a second material, different from the first material. [5] The waveguide system (100) according to any one of the preceding claims, wherein the biasing element (122) is an annular spring with a biasing force of at least 600 N. [6] The shaft guide system (100) according to any one of claims 2-5, wherein the first bearing bush (140) has a recess (270) for receiving a damping element (272), and further comprising a damping element (272) arranged in the recess, wherein the damping element (272) is designed to prevent co-rotation of an outer bearing ring (126) of the first shaft bearing (120). [7] The shaft guide system (100) according to any one of claims 2-6, wherein the second bearing bush (150) has a groove recess (280) for receiving a retaining ring (282), wherein the groove recess (280) has a tapered shape, and further comprising a retaining ring (282) arranged in the groove recess (280), wherein the retaining ring (282) is designed to fix the second shaft bearing (150). [8] A rotor (310) comprising a waveguide system (320) according to any one of the preceding claims. [9] A vehicle (300) comprising a waveguide system (320) according to any one of claims 1-7 or a rotor (310) according to claim 8. [10] A method (400) for manufacturing a bearing bush for a shaft guide system, comprising: Fixing (410) the bearing bush on an end face along a support circumference in the radial direction of the bearing bush; and Casting (420) around the bearing bush so that a lateral surface of the bearing bush and the end face of the bearing bush are at least partially cast around, wherein the end face is cast around outside and inside the circumference of the holder.

Citation Information

Patent Citations

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    EP3982521A1

  • Electric power steering apparatus

    US20030127277A1

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