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US 6,308,810 B1Granted
Dynamic damper with balancing means and method of manufacturing the same
AssigneeTokai Rubber Industries, Ltd.
InventorNaohito Kuwayama
Life of this patent
Estimating the term…
Abstract
A dynamic damper for damping vibration of a rotary shaft is disclosed. The dynamic damper includes: (a) a mass member having a generally cylindrical shape and formed by rolling into the generally cylindrical shape, with circumferentially opposite end portions of the plate being circumferentially opposed to each other, and with the circumferentially opposite end portions being unconnected to each other; (b) an elastic support member to be mounted on the rotary shaft, for elastically supporting the mass member with respect to the rotary shaft such that the mass member is displaceable relative to the rotary shaft; and (c) balancing means for maintaining a rotary balance of the mass member about an axis of the mass member.
Claims15
A dynamic damper for damping vibration of a rotary shaft, comprising:
- a mass member having a generally cylindrical shape and formed from a plate having a predetermined contour, said plate being rolled into said generally cylindrical shape and including circumferentially opposite end portions which are opposed to each other in a circumferential direction thereof and which are unconnected to each other;
- an elastic support member to be mounted on said rotary shaft, for elastically supporting said mass member with respect to said rotary shaft such that said mass member is displaceable relative to said rotary shaft;
- and
- balancing means for maintaining a rotary balance of said mass member about an axis of said mass member,
- wherein said circumferentially opposed end portions of said plate have respective end faces which are spaced apart from each other with a circumferential gap in said circumferential direction, and wherein said balancing means cooperates with said circumferential gap to maintain said rotary balance of said mass member about said axis, said balancing means comprising at least one of mass-reducing means for reducing a mass of a circumferentially central portion of said plate which is substantially diametrically opposed to said circumferential gap, and mass-increasing means for increasing a mass of said circumferentially opposite end portions of said plate.
2 more elements
A dynamic damper for damping vibration of a rotary shaft, comprising:
- a mass member having a generally cylindrical shape and formed from a plate having a predetermined contour, said plate being rolled into said generally cylindrical shape and including circumferentially opposite end portions which are opposed to each other in a circumferential direction thereof and which are unconnected to each other;
- an elastic support member to be mounted on said rotary shaft, for elastically supporting said mass member with respect to said rotary shaft such that said mass member is displaceable relative to said rotary shaft;
- and
- balancing means for maintaining a rotary balance of said mass member about an axis of said mass member,
- wherein said balancing means comprises mass-reducing means for reducing a mass of at least one local portion of said plate, said at least one local portion being located in a circumferentially central portion of said plate which is substantially diametrically opposed to said circumferentially opposite end portions of said plate.
2 more elements
A dynamic damper for damping vibration of a rotary shaft, comprising:
- a mass member having a generally cylindrical shape and formed from a plate having a predetermined contour, said plate being rolled into said generally cylindrical shape and including circumferentially opposite end portions which are opposed to each other in a circumferential direction thereof and which are unconnected to each other;
- an elastic support member to be mounted on said rotary shaft, for elastically supporting said mass member with respect to said rotary shaft such that said mass member is displaceable relative to said rotary shaft;
- and
- balancing means for maintaining a rotary balance of said mass member about an axis of said mass member,
- wherein said balancing means comprises a plurality of through-holes formed through said plate in a thickness direction of said plate and spaced apart from each other in said circumferential direction, said plurality of through-holes having respective diameters different from each other.
2 more elements
A dynamic damper for damping vibration of a rotary shaft, comprising:
- a mass member having a generally cylindrical shape and formed from a plate having a predetermined contour, said plate being rolled into said generally cylindrical shape and including circumferentially opposite end portions which are opposed to each other in a circumferential direction thereof and which are unconnected to each other;
- an elastic support member to be mounted on said rotary shaft, for elastically supporting said mass member with respect to said rotary shaft such that said mass member is displaceable relative to said rotary shaft;
- and
- balancing means for maintaining a rotary balance of said mass member about an axis of said mass member,
- wherein said balancing means comprises mass-increasing means for increasing amass of at least one local portion of said plate, said at least one local portion being located in said circumferentially opposite end portions of said plate.
2 more elements
A method of manufacturing a dynamic damper for damping vibration of a rotary shaft, comprising:
- a mass member having a generally cylindrical shape and formed from a plate having a predetermined contour, said plate being rolled into said generally cylindrical shape and including circumferentially opposite end portions which are opposed to each other in a circumferential direction thereof and which are unconnected to each other;
- an elastic support member to be mounted on said rotary shaft, for elastically supporting said mass member with respect to said rotary shaft such that said mass member is displaceable relative to said rotary shaft;
- and
- balancing means for maintaining a rotary balance of said mass member about an axis of said mass member,
- said method comprising:
- a step of positioning said mass member in a mold cavity in a mold to form said elastic support member, with said mass member being held in contact, at each of at least three portions of an outer circumferential surface of said mass member circumferentially spaced apart from each other, with a positioning protrusion provided in said mold, so that said mass member is prevented from being displaced relative to said mold in a radial direction of said mass member;
- and
- a step of injecting a molding material into said mold cavity of said mold through an injection hole located radially inwardly of said mass member which is positioned in said mold, for thereby forming said elastic support member.
5 more elements
A method of manufacturing a dynamic damper for damping vibration of a rotary shaft, comprising:
- a mass member having a generally cylindrical shape and formed from a plate having a predetermined contour, said plate being rolled into said generally cylindrical shape and including circumferentially opposite end portions which are opposed to each other in a circumferential direction thereof and which are unconnected to each other;
- an elastic support member to be mounted on said rotary shaft, for elastically supporting said mass member with respect to said rotary shaft such that said mass member is displaceable relative to said rotary shaft;
- and
- balancing means for maintaining a rotary balance of said mass member about an axis of said mass member,
- said method comprising:
- a step of measuring a rotary balance of said mass member about an axis of said mass member, before said mass member is fixed to said elastic support member;
- a step of determining an arrangement of said balancing means on the basis of a result of the measurement of said rotary balance, so as to change a mass of at least one local portion of said plate for thereby adjusting said rotary balance;
- and
- a step of providing said dynamic damper with said balancing means having the determined arrangement.
6 more elements
Dependencies are inferred from the claim text.