US 8,707,918 B2Granted

Valve train of a combustion piston engine

AssigneeZF Friedrichshafen AG

InventorsFrank Richter, Reiner Keller, Markus Wannags, Ilja Imgrunt

Life of this patent

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Abstract

A valve train of a combustion piston engine having an actuating device which comprises a phase shift gearbox with two inputs and an output for phase adjustment of a camshaft. The first input is connected with a crankshaft, the second input is connected with a controllable braking device and the output is rotationally fixed with the camshaft. The brake is an electromagnetically controlled friction brake which comprises an electromagnet and magnetic coil. A brake rotor is connected with the second input and can be biased, by the magnetic field of the electromagnet, against a friction surface. A permanent magnet is positioned axially adjacent the brake rotor such that, by its magnetic field, the brake rotor can be pressed against a fixed friction surface for the adjustment of a basic brake torque with the respective basic pressing force.

Claims8

Dependent claims

A valve train of a combustion piston engine, having an actuating device (1), comprising:

a phase shift gearset (3) with first and second input elements (4, 5) and an output element (6) for a phase adjustment of a camshaft (2),
the first input element (4) being drivingly connected with a crankshaft,
the second input element (5) being operatively connected with a controllable braking device (7), and
the output element (6) being connected, in a rotationally fixed manner, with the camshaft (2),
the braking device (7) being an electromagnetically controllable friction brake (15) comprising an enclosure-mounted electromagnet (16), a magnetic coil (18), and brake rotor (21) that is rotationally fixed and axially shiftably connected with the second input element (5), and which is pressed by a magnetic field of the electromagnet (16) against an enclosure-mounted friction surface (22), and
a permanent magnet (23, 23′) being positioned axially adjacent the brake rotor (21) such that a magnetic field permanent magnet (23, 23′) biasing the brake rotor (21) for adjustment of a basic brake torque, with a respective basic pressing force, against the enclosure-mounted friction surface (22).

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/816,387Filed 7 Jul 2011
Priority: DE 10 2010 039 86127 Aug 2010
Published: US 2013/0146007 A113 Jun 2013
Granted: 29 Apr 2014
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

F01L 1/344
Characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the…:…
F01L 1/352
Changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear: using bevel or epicyclic gear
F01L 2001/3522
Using bevel or epicyclic gear: with electromagnetic brake
F01L 2250/02
Camshaft drives characterised by their transmission means: the camshaft being driven by chains