Luk Lamellen Und Kupplungsbau Gmbh

Hartmut Mende

Johann Jackel

Andreas Raimann

Albert Albers

Ad Kooy

Johann J{overscore (a)}ckel

The coil springs of an arcuate energy storing device in a torsional vibration damper are fitted into each other in such a way that at least one convolution of the inner spring engages at least one convolution of the outer spring when the energy storing device is caused to store energy (or to store additional energy) and/or is permitted to dissipate energy while the damper is in actual use, e.g., between the primary and secondary flywheels of a composite flywheel in the power train of a motor vehicle. The at least one convolution of the outer spring can be facetted and/or deformed for reliable engagement with the at least one convolution of the inner spring, and the at least one convolution of the inner spring can have a circular or a non-circular outline. The at least one convolution of the inner spring can engage one or more end convolutions or one or more intermediate convolutions of the outer spring.

Torsional vibration damper

A torsional vibration damper has primary and secondary masses rotatable with and relative to each other about a common axis, and a torsionally elastic damper which opposes rotation of the masses relative to each other and operates in series with a torque limiting device. The latter comprises a pair of ring-shaped lateral members flanking a ring-shaped intermediate member which can stress the energy storing elements of the torsionally elastic damper. One of the lateral members is a prestressed diaphragm spring which is riveted to the other lateral member. The maximum torque which can be transmitted by the torque limiting device is greater than the maximum torque which can be transmitted by a friction clutch between the secondary mass and the transmission of a motor vehicle. The primary mass can receive torque from the engine of the vehicle.

An apparatus for damping torsional vibrations, particularly between coaxial primary and secondary masses of a composite flywheel in the power train between the engine and the transmission of a motor vehicle, has at least one coil spring or torsion spring which extends around the common axis of the two masses, which is stressed at least in the radial direction, and which is in a mere frictional (rather than positive) torque transmitting engagement with at least one of the masses. The spring can be installed to transmit torque from the secondary mass to the primary mass and/or vice versa, and such spring can operate in series with a damper between the primary and secondary masses.

Apparatus for damping torsional vibrations

A multiple-component torque transmitting apparatus for attachment to the crankshaft of an engine is assembled by: (a) moving the pressure plate of an assembled friction clutch by a force applying device axially in a first direction toward a clutch housing and against the bias of a clutch spring with a force exceeding the operating point of the clutch spring, (b) measuring the magnitude of the force and the distance which is covered by the pressure plate and/or one or more portions of the spring and generating corresponding signals, (c) jointly moving the housing and the pressure plate axially in a second direction counter to the first direction and with a force exceeding the operating point and generating corresponding signals, (d) relaxing the force upon the clutch, (e) processing the signals into a further signal denoting the desired or optimum operating point of the clutch spring, (f) moving the clutch and a flywheel against each other until the bias of the spring reaches the calculated operating point, and (g) fixing the housing to the flywheel.

Method of assembling and mounting a torque transmitting apparatus

An apparatus which can transmit torque between the crankshaft or the camshaft of a combustion engine and the input shaft of a variable-speed transmission in the power train of a motor vehicle employs a damper having a rotary input member normally receiving torque from the engine, an output member rotatable with and relative to the input member and normally transmitting torque to the transmission, and a set of arcuate coil springs which yieldably oppose angular movements of the input and output members relative to each other with a first force which increases in response to increasing angular movements of the input and output members relative to each other and with a second force which is generated by centrifugal force and increases in response to increasing RPM of the engine. At least one additional spring is provided to oppose angular movements of the input and output members relative to each other (particularly when the vehicle is coasting) with a third force which increases in response to increasing angular movement of the input and output members relative to each other but is at least substantially independent of the centrifugal force.

Apparatus for damping-torsional vibrations

A multiple-component torque transmitting apparatus for attachment to the crankshaft of an engine is assembled by: (a) moving the pressure plate of an assembled friction clutch axially in a first direction toward a clutch housing and against the bias of a clutch spring with a force exceeding the operating point of the clutch spring, (b) measuring the magnitude of the force and the distance which is covered by the pressure plate and/or one or more portions of the spring and generating corresponding signals, (c) moving the pressure plate axially in a second direction counter to the first direction with a force lower than the operating point and generating corresponding signals, (d) relaxing the force upon the clutch, (e) processing the signals into a further signal denoting the desired or optimum operating point of the clutch spring, (f) moving the clutch and a flywheel against each other until the bias of the spring reaches the calculated operating point, and (g) fixing the housing to the flywheel.

Growing community of inventors

Sinzheim, Germany

Hartmut Mende