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Methods and systems for multi-speed electric axle assembly

A technology of electric axles and components, applied in transmission elements, electric power devices, multi-gear ratio transmission devices, etc., can solve problems such as acceleration

Pending Publication Date: 2020-10-23
DANA HEAVY VEHICLE SYSTEMS GROUP LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using a single-speed transmission in an electric vehicle requires a trade-off between low-end acceleration and increased speed, and most manufacturers prefer acceleration over higher speeds

Method used

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  • Methods and systems for multi-speed electric axle assembly
  • Methods and systems for multi-speed electric axle assembly
  • Methods and systems for multi-speed electric axle assembly

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Embodiment Construction

[0013] . Electric vehicles (EVs) can employ a single gear to drive the wheels because electric motors have a wider RPM window in which they can operate efficiently compared to traditional internal combustion engines, and the motor is energy efficient throughout the entire RPM window. In this way, the EV does not need to be used at low speeds or a specific RPM range during acceleration, and can produce almost instantaneous torque from zero rpm. Therefore, a gear ratio for an electric vehicle axle assembly is selected that includes a balance between acceleration and top speed. If the gear ratio is too low, the EV can accelerate very quickly, but will be limited to a lower top speed. Alternatively, if the gear ratio is high, the gear ratio may be optimal for top speed, but acceleration will be limited. Therefore, what is needed for EVs is to achieve increased speed without compromising acceleration. Furthermore, different customer applications, such as racing applications, may ...

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Abstract

Various methods and systems are provided for a multi-speed electric axle assembly with three gear ratios. The multi-speed electric axle assembly includes one or more power supplies, one or more shaftsoperatively coupled to the one or more power supplies and a differential, and one or more Ravigneaux gear assemblies integrated with the one or more shafts. The one or more Ravigneaux gear assembliesof the multi-speed electric axle assembly providing the three gear ratios.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to U.S. Provisional Application Serial No. 62 / 831,784, filed April 10, 2019, entitled "Multi-Speed ​​Electric Axle Assembly." The entire contents of the applications listed above are hereby incorporated by reference for all purposes. technical field [0003] . Embodiments of the subject matter disclosed herein relate to a multi-speed electric vehicle (vehicle) axle assembly. Background technique [0004] Axle assemblies for electric vehicles may include single speed transmissions since electric motors have a wider RPM window in which they can operate efficiently compared to internal combustion engines. However, using a single-speed transmission in an EV requires a trade-off between low-end acceleration and increased speed, and most manufacturers favor acceleration over higher speeds. Contents of the invention [0005] .Furthermore, even in multi-speed electric vehicle transmissions,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60K1/02B60K17/02B60K17/08B60K17/16B60B35/12B60B35/14
CPCB60K1/02B60K17/02B60K17/08B60K17/16B60B35/12B60B35/14F16H3/663F16H2200/2038F16H2200/0039F16H2200/2007F16H2200/2035F16H37/046F16H2200/0021F16H37/0806
Inventor A·T·布拉默M·D·库克J·M·豪瑟
Owner DANA HEAVY VEHICLE SYSTEMS GROUP LLC