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US 2026/0036201 A1Published application
One-track shift drum apparatus and methods
AssigneeArvinMeritor Technology, LLC
InventorsSilvia Grunwald, Alexander Schrenk
Life of this patent
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Abstract
The disclosure relates to a shift drum for a transmission in an eAxle assembly. The shift drum including a body and a single guide path formed at the body and defining a shift pattern. Shift elements of a shift assembly may move along the single guide path of the shift drum to place the shift elements in a shift position. The shift positions correspond with a drive speed of the transmission. Each shift position engages a first, second, or third gearset.
Claims20
An electronic axle assembly comprising:
- a housing defining an internal cavity;
- a plurality of gearsets disposed within the housing, each gearset corresponding to a different transmission gear;
- and
- a shift assembly configured to selectively engage the plurality of gearsets to shift the transmission between a plurality of transmission gears, the shift assembly comprising:
- a single shift drum rotatably mounted within the housing and having a cylindrical body with an outer surface and a central axis of rotation;
- a guide path formed along the outer surface of the cylindrical body, the guide path defining a shift pattern and being configured to receive and guide at least one guided feature of a first shift element and a second shift element;
- the first and second shift elements each slidably mounted within the housing and operatively coupled to at least one gearset;
- and
- an actuator operatively coupled to the shift drum and configured to rotate the shift drum about the central axis of rotation in response to control signals from an electronic controller,
- wherein rotation of the shift drum to a selected rotational position guides at least one of the first and second shift elements to a corresponding shift position associated with one of the plurality of transmission gears.
7 more elements
A method of shifting a transmission of an electronic axle assembly, the method comprising:
- rotating a single shift drum having a continuous guide path formed along an outer cylindrical surface of a cylindrical body to a first rotational position to guide a first shift element along the continuous guide path to a first shift position associated with a first transmission gear;
- and
- rotating the shift drum to a second rotational position to guide a second shift element along the same continuous guide path to a second shift position associated with a second transmission gear,
- wherein the first and second shift elements are each slidably mounted within a transmission housing and are operatively coupled to a plurality of gearsets corresponding to a plurality of transmission gears.
1 more element
Dependencies are inferred from the claim text.