Patent ID: 6113496
Filing Date: 2000-09-05
Classification: F16F

Abstract:
A vibration buffering device mounted between a prime mover and a power transmitting device to be able to transmit a power from the prime mover to the power transmitting device, said vibration buffering device comprising:a first mass member connected to one of the prime mover and the power transmitting device;a damper housing mounted in said first mass member and having a passage which is annular about a rotational axis of said first mass member and which opens radially inwards of said first mass member, and said damper housing having a plurality of sets of accommodating recesses which are formed into an arcuate shape about said rotational axis and which open into said passage in pairs;a second mass member connected to the other of the prime mover and the power transmitting device and capable of being angularly displaced about the same axis relative to said first mass member;a plurality of spring holders which are slidably inserted into said passage and which have a circumferential length substantially corresponding to a distance between said sets of the accommodating recesses;a plurality of first coil springs wherein each first coil spring of said plurality of first coil springs is inserted into said passage while being retained on a spring holder, so that opposite ends thereof are in contact with said spring holder of said plurality of spring holders in a power non-transmitting state;a plurality of second coil springs accommodated in the sets of accommodating recesses, respectively, so that opposite ends thereof are in contact with a) circumferentially opposite ends of the sets of accommodating recesses and b) circumferentially opposite ends of said spring holder in the power non-transmitting state; anda plurality of transmitting arms which are placed into said passage, so that the opposite ends of said first coil spring are in contact with said transmitting arms in the power non-transmitting state, and said plurality of transmitting arms are coupled to said second mass member and formed to have a circumferential length smaller than the distance between said sets of the accommodating recesses, so that said plurality of transmitting arms are brought into contact with one of the ends of said second coil springs in response to the relative rotation of said first and second mass members.