Schaeffler Technologies Ag & Co .kg

Bayerische Motoren Werke Aktiengesellschaft

Tobias Mederer

Peter Solfrank

Wolfram Kruhöffer

Jesko Jaekel

Franz Kreil

Alexander Tasche

Oliver Graf-Goller

Matthias Pitz

Philipp Schullan

An unbalanced shaft for compensating for inertial forces and/or mass moments of inertia of an internal combustion engine (), having an unbalanced portion (), the center of mass of which extends eccentric to the axis of rotation () of the unbalanced shaft () for generating the shaft imbalance (), a bearing portion () adjacent to the unbalanced portion, and a bearing race () joined thereto, the outer surface () of which serves as a race for the rolling elements of a roller bearing rotationally supporting the unbalanced shaft, and the inner surface () of which retracts radially relative to the outer circumscribed circle () of the unbalanced portion in a bearing circumference region running in the direction of the imbalance. In order to assemble the bearing race on the bearing portion, the following geometric relationships are provided: (i) d&#x3e;d, (ii) e&#x3e;&#xbd;(d&#x2212;d), (iii) e&#x3c;&#xbd;(d+d), where d=outer circumscribed circle diameter of the unbalanced portion and the bearing portion, d=inner diameter of the bearing race, and e=center point offset between dand d

Unbalanced shaft and method for producing same

A rolling element bearing, in particular a roller/needle bearing, having a cage including at least one inner cage and at least one outer supporting cage, said cages having windows () which are adapted to the rolling elements () and have lateral end rims () connecting a plurality of windows () and crossbars and in which the rolling elements () are guided and secured from falling out. Either the inner cage and the supporting cage are configured as a split inner cage ring and/or a split supporting cage ring and the rings can be attached to each other at the ends or the inner cage and the supporting cage are configured as inner cage shells and/or supporting cage shells and the shells can be attached to each other at the ends.

Rolling element bearing comprising a multi-part cage

A mass balancing mechanism and method of assembly of the same is provided. The mass balancing mechanism compensates mass forces and/or mass moments of inertia of an internal combustion engine and includes two compensation shafts and a traction drive which connects a driven pinion of the crankshaft to drive pinions of the compensation shafts through a traction mechanism. Rotation of the compensation shafts is achieved through a spur gearing with two meshing spur gears arranged between one of the drive pinions and the associated compensation shaft, one of the spur gears being connected to the one drive pinion and the other of the spur gears being connected to the associated compensation shaft. For adjusting the tooth flank lash between the spur gears, an eccentric bearing having a rotationally fixable eccentric raceway is provided by the invention.

Mass balancing mechanism and assembly method

A mass balancing device () for a reciprocating piston internal combustion engine is provided, having a first balancing shaft () and a second balancing shaft () disposed in the first balancing shaft coaxially thereto. The first balancing shaft () has at least one bearing point () for a first rolling bearing () and the second balancing shaft () has at least one bearing point () for a second rolling bearing (). The rolling bearings radially support the balancing shafts in the reciprocating piston internal combustion engine. At least one of the bearing locations is designed as a hollow cylinder having an outer shell surface serving as the bearing seat for the first rolling bearing and an inner shell surface serving as the bearing seat for the second rolling bearing, such that the first rolling bearing and the second rolling bearing overlap one another axially.

Growing community of inventors

Schwanstetten, Germany

Tobias Mederer