Dana Heavy Vehicle Systems Group, LLC

Dana Heavy Vehicle Group, LLC

Jordan M Houser

Darren J Ziskovsky

Michael D Cook

Mark A Davis

George A Willford

Mark W Leber

Travis J Miller

Marcus W Schmidt

Jeffrey M David

Aaron D Gries

Andrew T Brammer

Langston H Corn

James Allen

William F Waltz

Gustav Johnson

Nathan Smith

Nicholas W Smallman

Various methods and systems are provided for a shift assembly for a vehicle transmission. In one example, a shift assembly for a transmission includes a first barrel cam including a first cam track; a second barrel cam arranged coaxially with the first barrel cam and including a second cam track; a first motor configured to drive the first barrel cam independent of the second barrel cam; and a second motor configured to drive the second barrel cam independent of the first barrel cam.

Methods and systems for a transmission shift assembly

Methods and systems for a clutch cartridge are provided. The clutch cartridge includes, a dog clutch including a clutch ring slidingly engaged with a tube shaft and including a first toothed interface and a second toothed interface, where the dog clutch is designed to selectively engage a first gear and a second gear. The clutch cartridge further includes a first bearing coupled to the tube shaft and the first gear and a second bearing coupled to the tube shaft and the second gear.

Multi-speed gearbox and assembly method

Methods and systems for evacuating lubricant from an area of an axle are described. The lubricant may be evacuated away from one or more clutches during low temperatures so that a clutch may be engaged while having to displace less lubricant to engage the clutch. In one example, an electric machine may be rotated to evacuate lubricant away from the clutch.

Method for cold start lube evacuation

Various methods and systems are provided for a multispeed transmission. In one example, a method to increasing a shift performance of a transmission with actuated clutches comprises controlling an engagement depth of a clutch based on a gear that is being selected by the clutch. A target engagement depth of the clutch may be retrieved from a gear selection matrix in a lookup table stored in the memory of a controller of the transmission. The target engagement depth may depend on an amount of torque expected to be transferred to the gear.

Methods and systems for a multispeed transmission

Various methods and systems are provided for an dual-faced clutch collar for a transmission. In one example, a dual-faced clutch collar positioned on an output shaft of a gearbox comprises a clutch collar spline, where the clutch collar spline mates with the output shaft; a first face having a first set of axially protruding teeth to engage a high torque coupling, the first set of teeth having a first profile; and a second face having a second set of axially protruding teeth to engage a low torque coupling; the second set of teeth having a second profile; the second profile being different from the first profile. The first profile may be a courser tooth profile, to allow for maximum load carrying capacity, and the second profile may be a finer tooth profile, to allow for quicker gear engagements and more neutral space (e.g., due to reduced tooth depths).

Methods and systems for an asymmetric clutch collar

A cooling system for an electric machine is provided that includes a housing at least partially enclosing a rotor, a stator, and a coolant jacket, the coolant jacket including a plurality of coolant channels that receive coolant from a coolant inlet. In the cooling system two or more materials that form boundaries of the plurality of coolant channels are configured to thermally expand at different rates and form a bypass flow passage of at least one of the plurality of coolant channels when the two or more materials are below a threshold temperature or within a lower temperature range.

Electric machine with coolant jacket

In one example, a line of transmissions is provided comprising, a first transmission and a second transmission. Each transmission includes an input shaft with a first pair of gears arranged thereon and a first clutch positioned therebetween designed to selectively rotationally couple at least one of a first gear and a second gear of the first pair of gears to the input shaft. Each transmission includes a layshaft with a second pair of gears fixedly coupled thereto. Each transmission includes an output shaft with a third pair of gears arranged thereon and a second clutch positioned therebetween designed to selectively rotationally couple at least one of a third gear and a fourth gear in the third pair of gears to the output shaft. The first transmission has the second gear fixed to the input shaft. The second transmission has the fourth gear fixed to the output shaft.

Line of transmissions and method for operating the transmissions

Methods and systems for an electric drive assembly are provided herein. In one example, an electric drive system is provided that includes two multi-motor drive units with associated planetary gear reductions that have asymmetric gear ratios. The planetary gear reduction in each drive unit includes a ring gear and a sun gear that are rotationally coupled to a pair of motors and a carrier rotationally coupled to an output gear that interfaces with a gear reduction of an axle assembly.

Electric drive axle system and operating method

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 shafts operatively 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 assemblies of the multi-speed electric axle assembly providing the three gear ratios.

Methods and systems for a multi-speed electric axle assembly

A transmission system and a method for operation of said transmission is provided. The transmission system includes a first friction clutch with a first set of discs splined to a shaft and a second set of discs splined to an inner circumference of a first gear. The system further includes a first hydraulic passage extending through the shaft and including an outlet in the shaft that directly supplies a lubricant to the first and second sets of discs during transmission system operation, where the first gear includes outer teeth that are positioned circumferentially around the first gear outward from the first and second sets of discs and is designed to mesh with a second gear in the transmission system.

Clutch assembly and method for operation of the clutch assembly

Methods and systems are provided for a lubricant catching device. In one example, a system may include a device for capturing lubricant flowing in a clockwise direction and a counterclockwise direction. The device receives lubricant from a lubricated, rotating component.

Systems for a lubrication catch

Methods and systems for an electric drive assembly are provided herein. In one example, a method for operation of an electric drive system is provided that includes coordinating operation of a first electric drive unit and a second electric drive unit based on a first power request. In the system, each of the first and second electric drive units include a planetary gear reduction that delivers power from a pair of motors to a set of axle shafts, and the planetary gear reductions have asymmetric gear ratios.

Methods and systems for operating a transmission that includes one or more dog clutches are described. In one example, a torque capacity of a gear is estimated from an engagement depth of the dog clutch, and the gear may be held or shifted according to the torque capacity of the gear and a commanded torque.

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Sylvania, OH, United States of America

Jordan M Houser