Abstract: A torsional vibration damper in which vibration damping performance is ensured by preventing a contact between a rolling mass and a rotary member. A rolling mass includes a trunk penetrating through a bore. A first corner formed in an axial end of the trunk is rounded. A rotary member includes a second corner formed in the bore. an axial length of the first corner of the rolling mass is longer than an axial length of the second corner of the rotary member.

Abstract: A variable valve timing control device includes a phase detecting portion; a phase control portion driving an electromagnetic solenoid while obtaining a detection signal detected by the phase detecting portion to set a spool to one of a phase control region and a lock region; and a boundary memory portion memorizing a boundary electric current value for referring a boundary between the phase control region and the lock region when the phase control portion operates a phase control; and a characteristic calculation portion obtaining the boundary electric current value by calculation, the boundary electric current value supporting the boundary between the phase control region and the lock region based on solenoid characteristic information of the electromagnetic solenoid and valve characteristic information of an electromagnetic control valve, the characteristic calculation portion memorizing the boundary electric current value to the boundary memory portion.

Abstract: A torsional vibration damper in which a mass may be fitted easily into a chamber is provided. In the rotary disc, an insertion hole is formed integrally with the chamber. An opening diameter of the insertion hole is larger than an outer diameter of a flange plate of the mass, and an opening width at a boundary between the insertion hole and the chamber is larger than an outer diameter of a trunk of the mass. The retainer comprises a restricting portion that restricts an oscillating range of the mass in the chamber.

Abstract: A torque converter that is downsized in an axial direction utilizing existing space is provided. A pump impeller, a turbine runner, a lockup clutch, an elastic damper, and a planetary unit are held in a housing. A torsional vibration damping device is arranged concentrically with the lockup clutch. An input element is arranged concentrically with the lockup clutch while being connected to the lockup clutch and a drive member. An output element is connected to a driven member.

Abstract: A pendulum vibration damper in which a retainer is prevented from being moved or tilted in an axial direction. In the pendulum vibration damper, a restriction member formed on any one of the retainer and an inner face of the casing to be brought into contact to the other one of the retainer and the inner face of the casing when the retainer is moved or tilted in an axial direction of the rotary disc. A clearance between the casing and the rolling mass in the axial direction is shorter than a thickness of the retainer in the axial direction.

Abstract: A torsional vibration damper in which noise and vibrations in a planetary gear unit are suppressed is provided. In a planetary gear unit, as an inertial element is oscillated to establish an inertial torque by a relative rotation between a sun gear and a ring gear. Pinion gears are interposed between the sun gear and the ring gear at predetermined intervals, and gear dimensions of one of the pinion gears and gear dimensions of another one of the pinion gears are different from each other.

Abstract: A valve timing controller includes: a driving side rotation member synchronously rotating with a crankshaft of an internal combustion engine; a driven side rotation member contained in the driving side rotation member and rotating integrally with a cam shaft for opening and closing a valve coaxially with a rotating axis of the driving side rotation member; an electromagnetic valve displacing a relative rotation phase between the driving side and driven side rotation members by supplying a working fluid to advancing and retarding chambers defined between the driving side and driven side rotation members; an intermediate locking mechanism holding the relative rotation phase in an intermediate locking phase; a phase detection section detecting the relative rotation phase; and a control section controlling the electromagnetic valve based on a detection signal of the phase detection section.

Abstract: A torsional vibration damper having an improved attenuation performance of low frequency vibration. The torsional vibration damper comprises a rotary member rotated by torque, an inertia body rotated relatively on an outer radial side of the rotary member due to torque pulse, and a rolling member coupled to the rotary member and the inertia body. The rotary member includes support sections that are provided on its outer radial side, and by which the rolling member is restricted in a rotating direction of the rotary member and is engaged movably in a radial direction of the rotary member. The inertia body includes: a pair of mass sections respectively projecting toward both sides in an axial direction; and a pair of raceway surfaces on which the rolling member rolls. A center of curvature of each raceway surface is deviated from a rotational center of the rotary member.

Abstract: A vibration damping device that can prevent interference between a rolling mass and a cover resulting from deformation of the cover caused by pressure rise, and that can suppress noises is provided. The torsional vibration damping device comprises: a rotary member that is arranged in a torque converter; a rolling mass that is oscillated relatively to the rotary member by torque pulse; a bore that is formed on an outer circumferential portion of the rotary member in such a manner as to penetrates through the rotary member in a direction parallel to a rotational center axis; a cover that covers the rolling mass and the bore liquid-tightly to protect from oil in the torque converter; and a deformation-preventing member that prevents a deformation of the cover in a direction toward the rolling mass.

Abstract: There is provided a vibration damper which is capable of damping torsional vibrations by pendulum movement of a plurality of inertial masses, and damping vibrations of plurality of order without letting the inertial masses to interfere. A distance between a center of curvature of an inner surface of a first through-hole and a center of curvature of an inner surface of a second through-hole formed in a rotary member is shorter than a distance between a center of curvature of an inner surface of a fifth through-hole and a center of curvature of an inner surface of a sixth through-hole formed in a first inertial mass. Moreover, a distance between a center of curvature of an inner surface of a third through-hole and a center of curvature of an inner surface of a fourth through-hole in a rotary member is longer than a distance between a center of curvature of an inner surface of a seventh through-hole and a center of curvature of an inner surface of an eighth through-hole formed in a second inertial mass.

Abstract: A pendulum vibration damper in which a retainer is prevented from being moved or tilted in an axial direction. In the pendulum vibration damper, a restriction member formed on any one of the retainer and an inner face of the casing to be brought into contact to the other one of the retainer and the inner face of the casing when the retainer is moved or tilted in an axial direction of the rotary disc. A clearance between the casing and the rolling mass in the axial direction is shorter than a thickness of the retainer in the axial direction.

Abstract: A centrifugal pendulum damper for effectively suppressing torsional vibrations resulting from torque pulse. The centrifugal pendulum damper comprises: a rotary member rotated by a torque; an inertial member that rotates relatively to the rotary member; a chamber formed on the inertial member; and a rolling member held partially in the chamber while being allowed to oscillate therein, and held partially by the rotary member while being allowed to move radially. A raceway surface on which the rolling member rolls is formed in the chamber in such a manner that a curvature radius of an orbit of a gravity center of the rolling member oscillating along the raceway surface is increased with an increase in an oscillation angle of the rolling member.

Abstract: A palladium coated copper wire for ball bonding includes a core formed of pure copper or copper alloy having a purity of 98% by mass or more, and a palladium draw coated layer coated on the core. The copper wire has a diameter of 10 to 25 ?m, and the palladium drawn layer contains sulfur, phosphorus, boron or carbon.

Abstract: A pendulum torsional-vibration reducing device includes: a rotor having a plurality of through-holes formed in the rotor with predetermined intervals in a circumferential direction of the rotor; a rolling element disposed in the through-holes so as to carry out pendular movement; and a casing fixed to the rotor so as to cover the rolling element, wherein the casing includes fixing pieces in tight contact with both side surfaces of the rotor so as to hold the rotor therebetween, and a thickness of the rotor at a position where the fixing pieces are in tight contact is thinner than a thickness of the rotor at a position where a rolling surface to which the rolling element is pushed by centrifugal force is formed.

Abstract: A torque converter includes a housing, and a fluid-operated power transmitting portion and a vibration damping device which are accommodated within the housing and which are disposed around an axis such that the vibration damping device is located adjacent to the fluid-operated power transmitting portion in a direction of the axis, the torque converter further includes a space occupying member which occupies a part of a space formed within the housing and between the fluid-operated power transmitting portion and the vibration damping device. The space occupying member comprises a wall surface facing the fluid-operated power transmitting portion in the direction of the axis. A distance in the direction of the axis between a part of the wall surface and the fluid-operated power transmitting portion is smaller than a distance in the direction of the axis between the part of the wall surface and the vibration damping device.

Abstract: To provide a vibrator made of a piezoelectric crystal having a larger electromechanical coupling coefficient and a more satisfactory frequency-temperature characteristic than those of quartz, a vibrating piece (101) is made of a Ca3Ta(Ga1-xAlx)3Si2O14 single crystal (0<x?1). In the single crystal, letting ? be a rotation angle from an X-Z plane about an X-axis serving as a rotation axis, 18x+17.5???24x+24.5 is set. In addition, the vibrating piece (101) is made of a Ca3Nb(Ga1-xAlx)3Si2O14 single crystal (0<x?1). In the single crystal of this arrangement, letting ? be a rotation angle from an X-Z plane about an X-axis serving as a rotation axis, 25x+23.083???32x+26.167 is set.

Abstract: A torsional vibration damper in which vibration damping performance is ensured by preventing a contact between a rolling mass and a rotary member. A rolling mass includes a trunk penetrating through a bore. A first corner formed in an axial end of the trunk is rounded. A rotary member includes a second corner formed in the bore. an axial length of the first corner of the rolling mass is longer than an axial length of the second corner of the rotary member.

Abstract: An image forming apparatus has a changing portion configured to change, based on a detection result of a temperature sensor, response sensitivity in starting of power supply by a determination portion based on a detection result of a human body detection sensor in a case where a human body approaches the human body detection sensor. The changing portion increases the sensitivity in a case where a temperature detected by the temperature sensor is a second temperature lower than a first temperature than in a case where the temperature detected by the temperature sensor is the first temperature.

Abstract: A torsional vibration damper includes a planetary rotary unit and an elastic body that couples two rotary elements of three rotary elements so that the two rotary elements can rotate relatively to each other. The torsional vibration damper includes a shaft supporting member by which a rotation center axis of at least any one rotary element of the two rotary elements and a rotation center axis of the rotary element other than the planetary rotary unit and the two rotary elements are held on the same axis. The shaft supporting member has a holding section that is disposed in a position between fellow planetary rotary elements and not making contact with the planetary rotary elements and that fits with and thereby suppresses movement of the rotary element other than the planetary rotary unit and the two rotary elements in the axial direction.

Abstract: A torsional vibration damping device that prevents an increase in an inertial torque due to resonance without reducing a mass of an inertial mass member. A torque of an engine is delivered to a first rotary element of a planetary unit. The torsional vibration damping device damps pulsation of the torque of the engine to be delivered to the transmission by an inertial torque generated by a rotation of the third rotary element resulting from a relative rotation between the first rotary element and the second rotary element caused by the pulsation of the engine torque. The torsional vibration damping device comprises: a connection member rotated integrally with the first rotary element; an intermediate member rotated integrally with the second rotary element; an output member delivering torque to the transmission; a first elastic member connecting the connection member to the intermediate member; and a second elastic member connecting the intermediate member to the output member.