Soundproof wheel for railway vehicle
This soundproof wheel includes a soundproofing device ( 3 ) which is mounted to an inner peripheral surface ( 6 ) of a rim section ( 5 ) of the wheel. The soundproofing device ( 3 ) is provided with: a fixing ring ( 10 ) which is fitted in and fixed to a groove ( 8 ) formed in the inner peripheral surface ( 6 ); a first elastic body section ( 11 A) which is stuck to an outer peripheral surface ( 10 a ) of the fixing ring ( 10 ), is disposed within the groove ( 8 ), and has a plurality of first elastic body pieces; an additional mass section ( 12 ) which is stuck to a side of the first elastic body section ( 11 A) opposite to the fixing ring ( 10 ), is disposed within the groove ( 8 ), and has a plurality of additional mass pieces; and a second elastic body section ( 11 B) which is stuck to a side of the additional mass section ( 12 ) opposite to the first elastic body section ( 11 A), is disposed within the groove ( 8 ), and has a plurality of second elastic body pieces. The soundproofing device ( 3 ) includes a plurality of dynamic vibration absorbers. Each of the dynamic vibration absorbers has first and second elastic body pieces and an additional mass piece. This soundproof wheel allows for significant reduction in wheel vibration noise and is highly durable.
1. A soundproof wheel for a railway vehicle, comprising
a soundproofing device mounted onto an inner peripheral surface of a rim section of the wheel,
the soundproofing device including:
a fixing ring fixed to the rim section with at least an outer peripheral portion of the fixing ring fitted in a groove formed along a circumferential direction in the inner peripheral surface of the rim section;
a first elastic body section which is stuck to an outer peripheral surface of the fixing ring, and is disposed within the groove;
an additional mass section which is stuck to a side of the first elastic body section opposite to the fixing ring, and is disposed within the groove; and
a second elastic body section which is stuck to a side of the additional mass section opposite to the first elastic body section and is provided in the groove in such a way that no gap is formed between the second elastic body section and a bottom of the groove, wherein
the first elastic body section includes a plurality of first elastic body pieces which are spaced apart from each other in a circumferential direction of the fixing ring,
the second elastic body section includes a plurality of second elastic body pieces which are spaced apart from each other in the circumferential direction of the fixing ring,
the additional mass section includes a plurality of additional mass pieces which are spaced apart from each other in the circumferential direction of the fixing ring, and each additional mass piece is stuck to one of the plurality of first elastic body pieces, and one of the plurality of second elastic body pieces,
the wheel has multiple natural frequencies corresponding to multiple natural vibration modes,
the soundproofing device includes a plurality of dynamic vibration absorbers, each dynamic vibration absorber having the additional mass piece, and the first and second elastic body pieces, which are stuck to the additional mass piece,
at least one dynamic vibration absorber of the plurality of dynamic vibration absorbers has a resonance frequency different from the resonance frequency of another dynamic vibration absorber, and any of the resonance frequencies of the plurality of dynamic vibration absorbers corresponds to any of the multiple natural frequencies.
2. The soundproof wheel according to claim 1 , wherein
a spacer member is provided between the second elastic body section and the bottom of the groove.
3. The soundproof wheel according to claim 1 , further comprising:
a protrusion interposed between the dynamic vibration absorbers adjacent to each other, and protruding from the outer peripheral surface of the fixing ring.
4. The soundproof wheel according to claim 3 , wherein
a distal end of the protrusion is in contact with the bottom of the groove.