Zf Friedrichshafen Ag

Sascha Fiesel

Jürgen Blaser

Horst Leichsenring

Frank Sauter

Fabian Ley

Wolfgang Rapp

Julius Döpfert

A vehicle transmission has at least one lubrication point, a power take-off, a lubricant tapping point for a power take-off module, and a lubrication system for supplying the lubrication point(s) and the lubricant tapping point with lubricant. The lubrication system includes a lubricant reservoir, a main line section emerging from the lubricant reservoir, a first supply line section leading to the lubrication point(s), a second supply line section leading to the lubricant tapping point, and a return line section leading to the lubricant reservoir. A valve has a first valve port associated with the main line section, a second valve port associated with the lubricant tapping point, a third valve port associated with the return line section, and a bypass duct that acts between the first valve port and the second valve port. A vehicle with such a vehicle transmission and a working machine arrangement are also disclosed.

Vehicle transmission with a power take-off, vehicle and working machine arrangement

A vehicle transmission () which comprises a lubrication system and a connection for attaching a power take-off module () to the vehicle transmission. The lubrication system is designed to lubricate the vehicle transmission and the power take-off module (). The lubrication system has a pressure feed () and a lubricant line () fed with lubricant from the pressure feed. By way of a first section (A), the lubricant line () leads to at least one lubrication point of the vehicle transmission and, by way of a second section (B), to a lubricant tapping point () of the vehicle transmission for the power take-off module. A throttle () and a first valve (), connected parallel to the throttle, are arranged in the second section (B). The first valve () is designed to open toward the lubricant tapping point if the lubricant pressure rises to a first pressure level.

Vehicle transmission with a lubrication system and a connection for attaching a power take-off module to the vehicle transmission

Disclosed is method for operating a multi-gear vehicle transmission having a plurality of shifting elements (A, B, C, D, E) for engaging gears of the vehicle transmission. In a neutral gear a transmission input () and a transmission output () of the vehicle transmission are decoupled from one another. In a driving gear the transmission input () and the transmission output () of the vehicle transmission are coupled with one another by closing the shifting elements (A, B, C, D, E) associated with the driving gear in order to propel the vehicle. When the neutral gear is engaged, a transmission condition is determined, and if a transmission condition with elevated drag losses exists, then in addition to the shifting elements (A, B, C, D, E) of a driving gear, at least one further shifting element (A, B, C, D, E) of the vehicle transmission is closed.

Method and transmission control apparatus for operating a multiple-speed vehicle transmission

Disclosed is a method for operating a multi-speed vehicle transmission having a plurality of shift elements (A, B, C, D, E) for engaging the gears of the vehicle transmission. The method includes decoupling between an input (AN) and an output (AB) of the vehicle transmission in a neutral gear, and coupling the input (AN) and the output (AB) of the vehicle transmission in a drive gear for propelling the vehicle by closing at least one shift element (B). At least one transmission state is determined when the neutral gear is engaged, where a shift element (D) for a reverse gear of the vehicle transmission is closed at least partially if the transmission is in a state with increased drag losses when the neutral gear is engaged.

Method and control apparatus for operating a multiple-speed vehicle transmission

A filling and draining device for filling lubricant into and draining lubricant out of a housing (), having a lubricant line () through which the lubricant passes into the housing (), during filling, and through which the lubricant passes when the lubricant is drained from the housing (). The housing () has a valve () through which the lubricant flows during filling and draining such that, for filling, the valve () adopts a first aperture width for the lubricant and, for draining, the valve () adopts a second aperture width for the lubricant.

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Friedrichshafen, Germany

Sascha Fiesel