Abstract: A cylindrical dynamic damper including: a cylindrical fastening member of elastic body to be fitted onto a rod shaped vibrating member; a mass member of tubular shape disposed about the cylindrical fastening member in a concentric fashion; a plurality of elastic connecting members disposed between the cylindrical fastening member and the mass member to extend in an axis-perpendicular direction; and a plurality of thin elastic film members disposed between and integrally formed with circumferentially adjacent ones of the elastic connecting members. The cylindrical fastening member and the mass member is elastically connected together via the elastic connecting members and the elastic film members. Each of the elastic film members is inclined to one axial side, and at least one of the elastic film members is inclined to an opposite axial side in comparison with the other elastic film members.

Abstract: A cylindrical dynamic damper including: a cylindrical mass member disposed about a rotating shaft and coaxially therewith; and a pair of elastic support members having a pair of ring-shaped affixing members situated at axial ends of the mass member and mounted on an outside peripheral face of the rotating shaft and a pair of elastic support portions of cylindrical shape connecting respectively to the affixing members and to the axial ends of the mass member to thereby elastically support the mass member. The mass member has on inside peripheral corners of both axial ends slanted faces disposed in chamfered profile and varying in shape in the circumferential direction; and the elastic support portions connected at one ends to the slanted faces have free length varying in the circumferential direction.

Abstract: A structure for mounting a dynamic damper on a rotary shaft is disclosed. The dynamic damper comprises a mass member having a center of gravity at a position deviated from the axial center thereof toward a first end of axially opposite ends, and a first and second elastic support members which elastically support the mass member and allow the mass member to be relatively displaced. The mass member is mounted on the rotary shaft by fixing the first and second elastic support members to the rotary shaft, such that an axial first section having the center of gravity of the mass member is located closer to the position of the loop of the bending vibration on the rotary shaft than an axial second section, whereby the dynamic damper is mounted on the rotary shaft.

Abstract: A cylindrical dynamic damper including: a cylindrical fastening member of elastic body to be fitted onto a rod shaped vibrating member; a mass member of tubular shape disposed about the cylindrical fastening member in a concentric fashion; a plurality of elastic connecting members disposed between the cylindrical fastening member and the mass member to extend in an axis-perpendicular direction; and a plurality of thin elastic film members disposed between and integrally formed with circumferentially adjacent ones of the elastic connecting members. The cylindrical fastening member and the mass member is elastically connected together via the elastic connecting members and the elastic film members. Each of the elastic film members is inclined to one axial side, and at least one of the elastic film members is inclined to an opposite axial side in comparison with the other elastic film members.

Abstract: A cylindrical dynamic damper including: a cylindrical mass member disposed about a rotating shaft and coaxially therewith; and a pair of elastic support members having a pair of ring-shaped affixing members situated at axial ends of the mass member and mounted on an outside peripheral face of the rotating shaft and a pair of elastic support portions of cylindrical shape connecting respectively to the affixing members and to the axial ends of the mass member to thereby elastically support the mass member. The mass member has on inside peripheral corners of both axial ends slanted faces disposed in chamfered profile and varying in shape in the circumferential-direction; and the elastic support portions connected at one ends to the slanted faces have free length varying in the circumferential direction.

Abstract: A dynamic damper including: a cylindrical metallic mass; a cylindrical fixing member with an inner diameter smaller than that of the metallic mass member; a connecting member connecting the metallic mass member with respect to the fixing member; and a covering member integrally formed with the cylindrical fixing member and the connecting member, and covering the mass member. A plurality of engaging recesses are formed at axial end portions of the mass member to be open in an outer circumferential surface thereof, and a plurality of engaging projections integrally formed with the covering member are held in stable engagement with the engaging recesses, respectively.

Abstract: A dynamic damper including a rubber elastic body interposed between and connecting an inner sleeve mounted at one end on a flat attachment surface of an object member and a cylindrical mass member disposed coaxially about the inner sleeve with a spacing therebetween, and an annular flange extending radially outwardly from the one end of the inner sleeve. When the dynamic damper is mounted on the attachment surface, an outer rim of the one end of the inner sleeve is surrounded by an outer rim of an area of the attachment surface where is superimposed with the flange.

Abstract: A dynamic damper mounted on a rod-shaped oscillating member is disclosed which includes: a cylindrical metallic mass member formed of sintered metal or forging and disposed radially outwardly of the oscillating member; two elastic support members formed on axially opposite sides of the metallic mass member to elastically support the metallic mass member; and an elastic covering layer integrally formed with the elastic support member and fixed in close contact with the substantially entire area of the surface of the metallic mass member. The metallic mass member has bevels in the form of tapered cylindrical surfaces formed at radially inner edges of axially opposite end faces of said metallic mass member, respectively. Each of the bevels extends over a corresponding one of the axially opposite end faces and an inner circumferential surface of the metallic mass member to thereby chamfer the corresponding one of the radially inner edges.

Abstract: A fluid filled elastic mount including a rubber elastic body disposed between and integrally connecting coaxial main rod member and outer sleeve member at their first ends. A diaphragm is also disposed between the main rod member and outer sleeve member at their second ends to form between itself and the rubber elastic body a fluid chamber that is divided by an annular partition member held with its outer peripheral edge press fit against the outer sleeve member into a primary fluid chamber and an auxiliary fluid chamber, while forming an orifice passage between its inner surface and the main rod member, for permitting a communication between the primary and auxiliary fluid chamber. The diaphragm has a thick walled portion of annular disk shape, and thin walled portions formed extending circumferentially about an outer peripheral edge of the thick walled portion while covering a smaller range than the thick walled portion.

Abstract: A dynamic damper including: a cylindrical metallic mass; a cylindrical fixing member with an inner diameter smaller than that of the metallic mass member; a connecting member connecting the metallic mass member with respect to the fixing member; and a covering member integrally formed with the cylindrical fixing member and the connecting member, and covering the mass member. A plurality of engaging recesses are formed at axial end portions of the mass member to be open in an outer circumferential surface thereof, and a plurality of engaging projections integrally formed with the covering member are held in stable engagement with the engaging recesses, respectively.

Abstract: A dynamic damper mounted on a rod-shaped oscillating member is disclosed which includes: a cylindrical metallic mass member formed of sintered metal or forging and disposed radially outwardly of the oscillating member; two elastic support members formed on axially opposite sides of the metallic mass member to elastically support the metallic mass member; and an elastic covering layer integrally formed with the elastic support member and fixed in close contact with the substantially entire area of the surface of the metallic mass member. The metallic mass member has bevels in the form of tapered cylindrical surfaces formed at radially inner edges of axially opposite end faces of said metallic mass member, respectively. Each of the bevels extends over a corresponding one of the axially opposite end faces and an inner circumferential surface of the metallic mass member to thereby chamfer the corresponding one of the radially inner edges.

Abstract: A vibration isolator includes an inner cylindrical metal member, an outer cylindrical metal member located outside the inner cylindrical metal member in a radial direction, and a rubber elastic member interposed between the inner and outer cylindrical metal members so as to elastically connect between these metal members, and is supported by a support metal member forced and fixed into an axial hole of the inner cylindrical metal member. The inner cylindrica metal member is coaxially bulged in a radial direction.

Abstract: A dynamic damper mounted on a rod-shaped oscillating member is disclosed which includes: a cylindrical metallic mass member formed of sintered metal or forging and disposed radially outwardly of the oscillating member; two elastic support members formed on axially opposite sides of the metallic mass member to elastically support the metallic mass member; and an elastic covering layer integrally formed with the elastic support member and fixed in close contact with the substantially entire area of the surface of the metallic mass member. The metallic mass member has bevels in the form of tapered cylindrical surfaces formed at radially inner edges of axially opposite end faces of said metallic mass member, respectively. Each of the bevels extends over a corresponding one of the axially opposite end faces and an inner circumferential surface of the metallic mass member to thereby chamfer the corresponding one of the radially inner edges.

Abstract: A dynamic dater mounted on a rod-shaped oscillating member is disclosed, which includes: a cylindrical mass member disposed radially outwardly of the oscillating member and formed of a metallic material by forging, while being subjected to a scale-removal treatment; an elastic support member for elastically supporting the metallic mass member for connection thereof with the oscillating member; and an elastic covering layer adapted to cover a substantially entire area of the surface of the metallic mass member and integrally formed with the elastic support member. The elastic covering layer is fixed in close contact with the substantially entire area of the outer surface of the mass member, so that the metallic mass member is firmly secured to the elastic support member without using an adhesive. A method of producing the dynamic damper is also disclosed.

Abstract: A dynamic damper mounted on a rod-shaped oscillating member includes: a cylindrical metallic mass member formed of sintered metal or forging and adapted to be disposed radially outwardly of the oscillating member; two elastic support members formed on axially opposite sides of the metallic mass member to elastically support the metallic mass member; and an elastic covering layer integrally formed with the elastic support member and fixed in close contact with substantially the entire area of the surface of the metallic mass member. The metallic mass member has at least two slits extending through a wall thickness thereof, which are open in and extending axially inwardly from axially opposite end faces of the metallic mass member, respectively, and are filled with the elastic covering layer. The metallic mass further has inclined planes formed at radially inner edges of circumferentially opposite open-end edge portions of each slit.

Abstract: A vibration isolator includes: an inner cylindrical metal member 10; a stopper member 13 which is fixed at its axial intermediate position and is projected into a vibration input direction; an outer cylindrical metal member 28 arranged outside the inner cylindrical metal member; a rubber elastic member 20 which elastically connects between the inner and outer cylindrical metal members; and a support metal member 30 which is forced into an axial hole of the inner cylindrical metal member and has one end projecting from the inner cylindrical metal member. An axial intermediate portion of the inner cylindrical metal member including a locating portion of the stopper member is a large-diameter portion 11 which is slightly bulged into a diametrical direction and has inner and outer diameters slightly larger than inner and outer diameters of other portions.

Abstract: A dynamic damper mounted on a rod-shaped oscillating member is disclosed which includes: a cylindrical metallic mass member formed of sintered metal or forging and disposed radially outwardly of the oscillating member; two elastic support members formed on axially opposite sides of the metallic mass member to elastically support the metallic mass member; and an elastic covering layer integrally formed with the elastic support member and fixed in close contact with the substantially entire area of the surface of the metallic mass member. The metallic mass member has bevels in the form of tapered cylindrical surfaces formed at radially inner edges of axially opposite end faces of said metallic mass member, respectively. Each of the bevels extends over a corresponding one of the axially opposite end faces and an inner circumferential surface of the metallic mass member to thereby chamfer the corresponding one of the radially inner edges.

Abstract: A dynamic damper is provided comprising a tubular mass member 11, a pair of elastic joining regions 13 of a tubular shape having an inner diameter smaller than that of the mass member 11, arranged coaxially, and spaced by a specific distance outwardly from the axial ends of the mass member 11, and a pair of elastic arm regions 14 shape of a tubular, each arm region arranged to join throughout the circumference between one axial end of the mass member and one of the paired joining regions 13. A boundary 15 of the inner surface between the elastic joining region and the elastic arm region 14 is located on the outside of the axial ends of the mass member 11. The elastic arm region 14 is sloped and arranged in a funnel-like shape which becomes wider from the boundary 15 towards the axial ends of the mass member 11. The boundary 15 is shaped to an edge of which the curvature radius is not larger than 1 mm.

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.