Torsional damper type flywheel device

A torsional damper type flywheel device comprising:

• a rotatable first flywheel;
• a second flywheel arranged coaxially with respect to the first flywheel and rotatable relative to the first flywheel;
• a first control plate rotatable relative to the first flywheel and the second flywheel;
• a first spring mechanism connected having a first end and a second end, said first end being connected to said first flywheel and said second end being connected to said second flywheel;
• a second spring mechanism having a first end and a second end, said first end being connected to said first flywheel and the second end being connected to said first control plate;
• and
• a hydraulic damping mechanism having a first side and a second side, said first side being connected to said first control plate and said second second side being connected to said second flywheel;
• wherein said hydraulic damping mechanism includes at least one hydraulic damper which comprises:
• a first outer cylinder and a second outer cylinder axially movable relative to each other;
• an inner cylinder fixed to the second outer cylinder and axially slidable relative to the first outer cylinder, the inner cylinder having an orifice formed therein;
• and
• a diaphragm disposed on a side of the inner cylinder closer to the second cylinder,
• the inner cylinder and the first outer cylinder defining a first chamber therein, and the inner cylinder and the diaphragm defining a second chamber therein, the first and second chambers being filled with liquid and communicating with each other through the orifice formed in the inner cylinder so that the orifice generates a viscous damping when the liquid flows through the orifice.

A torsional damper type flywheel device comprising:

• a rotatable first flywheel;
• a second flywheel arranged coaxially with respect to the first flywheel and rotatable relative to the first flywheel;
• a first control plate rotatable relative to the first flywheel and the second flywheel;
• a first spring mechanism connected having a first end and a second end, said first end being connected to said first flywheel and said second end being connected to said second flywheel;
• a second spring mechanism having a first end and a second end, said first end being connected to said first flywheel and the second end being connected to said first control plate;
• and
• a hydraulic damping mechanism having a first side and a second side, said first side being connected to said first control plate and said second side being connected to said second flywheel;
• wherein the hydraulic damping mechanism includes at least one hydraulic damper that comprises:
• a first chamber filled with liquid;
• a second chamber filled with liquid;
• and
• an orifice disposed between and connecting said first and second chambers, said orifice generating a viscous damping when liquid flows therethrough;
• and
• wherein the torsional damper type flywheel device has a torque versus torsional angle characteristic that is variable according to a torsional speed between a K characteristics where only the first spring mechanism operates and a K+K1 characteristics where both the first spring mechanism and the second spring mechanism operate.