A damper device is disposed between an engine and a transmission. The damper device includes a differential mechanism. The differential mechanism includes a first input element connected to the engine, a second input element connected to the engine, and an outputting element connected to the transmission. The damper device also includes a first spring disposed between the engine and the first input element, an inertia member disposed between the first spring and the first input element, and a second spring disposed between the transmission and the outputting element.
1. A damper device disposed between an engine and a transmission, comprising:
a differential mechanism including a first input element connected to the engine, a second input element connected to the engine, and an outputting element connected to the transmission;
a first elastic member disposed between the engine and the first input element;
an inertial mass body disposed between the first elastic member and the first input element; and
a second elastic member disposed between the transmission and the outputting element,
wherein the first elastic member and the second elastic member comprise spring members, and a spring constant of the second elastic member is set to or below a spring constant of the first elastic member.
2. The damper device of claim 1 , wherein the differential mechanism is accommodated in a torque converter.
3. The damper device of claim 2 , wherein a lock-up clutch is disposed between the engine and the first elastic member.
4. The damper device of claim 2 , wherein the torque converter includes a pump impeller connected to the engine, and a turbine runner opposing to the pump impeller, and
wherein the second elastic member is disposed between the outputting element and the turbine runner.
5. The damper device of claim 4 , wherein a lock-up clutch is disposed between the engine and the first elastic member.
6. The damper device of claim 1 ,
wherein a resonance point of the differential mechanism is offset from a frequency range of the engine.
7. The damper device of claim 1 ,
wherein a resonance point of the differential mechanism is offset from an engine service frequency range.
8. The damper device of claim 1 ,
wherein a mass of the second elastic member, the differential mechanism, and the inertial mass body is set such that a resonance point of the differential mechanism is offset from a frequency range of the engine.
9. A damper device disposed between an engine and a transmission, comprising:
a differential mechanism including a first input element connected to the engine, a second input element connected to the engine, and an outputting element connected to the transmission;
a first elastic member disposed between the engine and the first input element;
an inertial mass body disposed between the first elastic member and the first input element; and
a second elastic member disposed between the transmission and the outputting element,
wherein the first elastic member and the second elastic member comprise spring members, and a spring constant of the second elastic member is set in relation to a spring constant of the first elastic member such that a resonance point of the differential mechanism is offset from a frequency range of the engine.
10. The damper device of claim 9 ,
wherein the spring constant of the second elastic member is set to or below the spring constant of the first elastic member.
11. The damper device of claim 9 ,
wherein the spring constant of the second elastic member is set above the spring constant of the first elastic member.
12. The damper device of claim 9 , wherein the differential mechanism is accommodated in a torque converter.
13. The damper device of claim 12 , wherein a lock-up clutch is disposed between the engine and the first elastic member.
14. The damper device of claim 12 , wherein the torque converter includes a pump impeller connected to the engine, and a turbine runner opposing to the pump impeller, and
wherein the second elastic member is disposed between the outputting element and the turbine runner.
15. The damper device of claim 14 , wherein a lock-up clutch is disposed between the engine and the first elastic member.