US 5,307,710 A · Two-mass flywheel · patentgrep

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Abstract

The invention proposes a two-mass flywheel for the drive line of a motor vehicle. The two-mass flywheel comprises a torsional vibration damper with, distributed over the periphery, a plurality of coil springs (31, 31') which are braced on one another via sliding shoes (43). The sliding shoes (43) guide the springs (31) in a passage (29). End shoes (41) bearing on the end springs (31') and the sliding shoes (43) have extension pieces which prevent the springs (31, 31') bearing on the outer contours of the passage (23) at relatively high rotary speeds. The passage contains viscous lubrication so that in conjunction with slip-promoting coating on the end shoes (41) and sliding shoes (43) a very low basic friction is achieved.

Claims42

Dependent claims

A two-mass flywheel to be disposed in the drive line of a motor vehicle driven by an internal combustion engine, comprising:

a first flywheel (3) adapted to be mounted on a crankshaft (1) of the internal combustion engine for rotation about the axis of rotation (9) of the crankshaft (1);
a second flywheel (7) mounted to rotate about said axis relative to the first flywheel (3) and serving as a carrier for a friction clutch (11) in the drive line;
torsional vibration damping means (13) for coupling the two flywheels (3, 7) to each other in a rotationally elastic manner, said torsional vibration damping means including a plurality of coil springs (31) disposed on a common mean diameter in a passage (29) in the first flywheel (3) and extending arcuately about the axis of rotation (9);
said plurality of coil springs (31) including at least one set (35, 37) of at least two individual coil springs (31) which are connected in series and are disposed in the passage (29) one after the other;
a sliding shoe (43), movable relative to the two flywheels (3,7), positioned between mutually facing ends of peripherally adjacent coil springs (31) of each set (35, 37) for guiding the mutually facing ends of the adjacent coil springs (31) in the passage (29);
the ends of the coil springs (31') of each set (35, 37) which are outermost in the peripheral direction are, for the transfer of force, guided on end shoes (41);
the end shoes (41) and the sliding shoes (43) guide the coil springs (31) at a radial distance from an inner wall surface (27) of the first flywheel (3) which radially outwardly defines the passage (29);
and
the passage (29) is at least partially filled with a viscous material (49).

6 more elements

A two-mass flywheel to be disposed in the drive line of a motor vehicle driven by an internal combustion engine, comprising:

a first flywheel (3) adapted to be mounted on a crankshaft (1) of the internal combustion engine for rotation about the axis of rotation (9) of the crankshaft (1);
a second flywheel (7) mounted to rotate about said axis relative to the first flywheel (3) and serving as a carrier for a friction clutch (11) in the drive line;
torsional vibration damping means (13) for coupling the two flywheels (3, 7) to each other in a rotationally elastic manner, said torsional vibration damping means including a plurality of coil springs (31) disposed on a common mean diameter in a passage (29) in the first flywheel (3) and extending arcuately about the axis of rotation (9);
said plurality of coil springs (31) including at least one set (35, 37) of at least two individual coil springs (31) which are connected in series and are disposed in the passage (29) one after the other;
a sliding shoe (43), movable relative to the two flywheels (3, 7), positioned between mutually facing ends of peripherally adjacent coil springs (31) of each set of coil springs (35, 37) for guiding the mutually facing ends of the adjacent coil springs (31) in the passage (29);
the ends of the coil springs (31') of each set of coil springs (35, 37) which are outermost in the peripheral direction are, for the transfer of force, guided on end shoes (41);
the spring supporting surface (127) of each end shoe (41), in the inoperative position of the torsional vibration damping means (13), extends at least approximately at right-angles to the axis (95) of the coil spring (31');
and
the torsional vibration damping means (13) guides the end shoes (41) on control elements (39, 53), the end shoes (41) and control elements (39, 53) having mutually associated and matchingly shaped prismatic guides of which every two--viewed in a plane at right-angles to the axis of rotation (9) and containing the axis (95) of the spring--have prism surfaces inclined towards each other, the prism surfaces (123, 125) of the end shoes (41) being so disposed in relation to the spring supporting surface (127) that a straight line (131) extending at one end through the point of intersection of the prism surfaces (123, 125) and at the other through the point of intersection of the spring axis (95) and the plane of the spring supporting surface (127) at an acute angle to the direction of the axis (95) of the spring, when the spring is at rest, extends at least approximately in the direction of the spring axis (95) at maximum compression of the coil spring (31').

6 more elements

A two-mass flywheel to be disposed in the drive line of a motor vehicle driven by an internal combustion engine, comprising:

a first flywheel (3) adapted to be mounted on a crankshaft (1) of the internal combustion engine for rotation about the axis of rotation (9) of the crankshaft (1);
a second flywheel (7) mounted to rotate about said axis relative to the first flywheel (3) and serving as a carrier for a friction clutch (11) in the drive line;
torsional vibration damping means (13) for coupling the two flywheels (3, 7) to each other in a rotationally elastic manner, said torsional vibration damping means including a plurality of coil springs (31) disposed on a common mean diameter in a passage (29) in the first flywheel (3) and extending arcuately about the axis of rotation (9);
said plurality of coil springs (31) including at least one set (35, 37) of at least two individual coil springs (31) which are connected in series and are disposed in the passage (29) one after the other;
a sliding shoe (43), movable relative to the two flywheels (3,7), positioned between mutually facing ends of peripherally adjacent coil springs (31) of each set of coil springs (35, 37) for guiding the mutually facing ends of the adjacent coil springs (31) in the passage (19);
the torsional vibration damping means (13) including, for passing on the torque from the coil springs (31) of each set (35, 37) to the second flywheel (7), a hub disc (55) mounted to rotate in relation to the first flywheel (3) and having, for cooperating with the ends of the coil springs (31') of each set (35, 37) which is outermost in the peripheral direction, noses (53) which project radially outwardly;
the coil springs (31) are distributed around the periphery of the hub disc (55);
and
at least one coil spring (33) of each set (35, 37) bears with initial radial tension on the periphery of the hub disc (55) when the torsional vibration damping means (13) is in the rest position.

6 more elements

A two-mass flywheel to be disposed in the drive line of a motor vehicle driven by an internal combustion engine, comprising:

a first flywheel (3) adapted to be mounted on a crankshaft (1) of the internal combustion engine for rotation about the axis of rotation (9) of the crankshaft (1);
a second flywheel (7) mounted to rotate about said axis relative to the first flywheel (3) and serving as a carrier for a friction clutch (11) in the drive line;
torsional vibration damping means (13) for coupling the two flywheels (3, 7) to each other in a rotationally elastic manner, said torsional vibration damping means including a plurality of coil springs (31) disposed on a common means diameter in a passage (29) in the first flywheel (3) and extending arcuately about the axis of rotation (9);
said plurality of coil springs (31) including at least one set (35, 37) of at least two individual coil springs (31) which are connected in series and are disposed in the passage (29) one after the other;
a sliding shoe (43), movable relative to the two flywheels (3,7), positioned between mutually facing ends of peripherally adjacent coil springs (31) of each set of coil springs (35, 37) for guiding the mutually facing ends of the adjacent coil springs (31) in the passage (29);
the ends of the coil springs (31') of each set of coil springs (35, 37) which are outermost in the peripheral direction are, for the transfer of force, guided on end shoes (41);
a circularly cylindrical inner wall surface (27) of the first flywheel (3) radially outwardly defining the passage (29), substantially axially perpendicularly extending and substantially flat areas of side wall surface being adjacent to both sides of said circularly cylindrical wall surface (27);
and
at least one of the sliding shoes (43) and end shoes (41) provided for transfer of force to the outermost ends of the coil springs (31') of each set (35, 37) being adapted to match the contours of the radially outer portion of the passage (29) and being guided axially on the side wall surfaces.

6 more elements

A two-mass flywheel to be disposed in the drive line of a motor vehicle driven by an internal combustion engine, comprising:

a first flywheel (3) adapted to be mounted on a crankshaft (1) of the internal combustion engine for rotation about the axis of rotation (9) of the crankshaft (1);
a second flywheel (7) mounted to rotate about said axis relative to the first flywheel (3) and serving as a carrier for a friction clutch (11) in the drive line;
torsional vibration damping means (13) for coupling the two flywheels (3, 7) to each other in a rotationally elastic manner, said torsional vibration damping means including a plurality of coil springs (31) disposed on a common mean diameter in a passage (29) in the first flywheel (3) and extending arcuately about the axis of rotation (9);
said plurality of coil springs (31) including at least one set (35, 37) of at least two individual coil springs (31) which are connected in series and are disposed in the passage (29) one after the other;
a sliding shoe (43), movable relative to the two flywheels (3, 7), positioned between mutually facing ends of peripherally adjacent coil springs (31) of each set of coil springs (35, 37) for guiding the mutually facing ends of the adjacent coil springs (31) in the passage (29);
the first flywheel (3) including a primary disc (15) and an annular cover disc (21) which axially define the passage (29);
axially between the primary disc (15) and the cover disc (21) and adapted to rotate in relation to the first flywheel (3) there is an annular hub disc (55) which, via the set (35, 37) of coil springs (31), is rotationally elastically coupled to the primary disc (15) and cover disc (21) and forms a first spring stage (33) of the torsional vibration damping means (13), the hub disc (55) having a central aperture (63);
axially on both sides of the hub disc (55) and radially within the area of the coil springs (31) of the first spring stage (33) there are two lateral discs (57, 59) which form radially outwardly directed ring edges (77) on which the central aperture (63) of the hub disc (55) is radially guided for rotation;
the lateral discs (57, 59) are rigidly connected to the second flywheel (7);
and
the lateral discs (57, 59) are rotationally elastically coupled to the hub disc (55) by further springs (61) which form a second spring stage (51) of the torsional vibration damping means (13) which is disposed in series with the first spring stage (33).

8 more elements

Dependencies are inferred from the claim text.