Traction drive with cooling device, method for operating the traction drive and motor vehicle
The traction drive's innovative use of a coil spring to preload bearing assemblies and convey cooling medium through hollow shafts addresses cooling and cost challenges, enhancing performance and reliability.
DE102025114650B3Active Publication Date: 2026-05-28SCHAEFFLER TECHNOLOGIES AG & CO KG
Patent Information
- Authority / Receiving Office
- DE · DE
- Patent Type
- Patents
- Current Assignee / Owner
- SCHAEFFLER TECHNOLOGIES AG & CO KG
- Filing Date
- 2025-04-15
- Publication Date
- 2026-05-28
AI Technical Summary
Technical Problem
Existing traction drives for electrically powered motor vehicles face challenges in achieving efficient cooling while maintaining low manufacturing costs and high performance.
Method used
A traction drive design featuring a hollow rotor and transmission shafts preloaded by a coil spring, allowing a cooling medium to be conveyed through the shafts, enhancing cooling efficiency and bearing assembly preload, thereby reducing bearing damage and costs.
Benefits of technology
The design provides increased cooling effect and performance while minimizing bearing damage and reducing manufacturing costs, ensuring reliable operation even at varying temperatures.
✦ Generated by Eureka AI based on patent content.
Smart Images
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Abstract
The invention relates to a traction drive (TA) for a motor vehicle that is at least partially electrically powered, comprising a first bearing plate (L1) with a first bearing seat (LS1) and a first bearing assembly (LE1) arranged in the first bearing seat (LS1), a rotor hollow shaft (RHW) rotatably mounted over the first bearing assembly (LE1), a second bearing plate (L2) with a second bearing seat (LS2) and a second bearing assembly (LE2) arranged in the second bearing seat (LS2), a transmission hollow shaft (GHW) rotatably mounted over the second bearing assembly (LE2) and operatively connected to the rotor hollow shaft (RHW), and a spiral spring (SF) guided through the rotor hollow shaft (RHW) and the transmission hollow shaft (GHW), wherein the spiral spring (SF) exerts a spring force on the rotor hollow shaft (RHW) and the transmission hollow shaft (GHW).and the first bearing assembly (LE1) is clamped in the first bearing seat (LS1) and / or the second bearing assembly (LE2) in the second bearing seat (LS2) by the spring force, and wherein a cooling medium (KM) introduced into the gearbox hollow shaft (GHW) can be conveyed into the rotor hollow shaft (RHW) via the spiral fields (SF).
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