Keihin Corporation

Honda Motor Co., Ltd.

Sumitomo Riko Company Limited

Hirozumi Kon

Toshihiro Tahara

Tomohiro Nomura

Satoshi Tokuda

Osamu Hinata

Masakazu Murai

Atsushi Muramatsu

Hirotomi Nemoto

Hironori Koyama

Mutsumi Muraoka

Tetsuo Mikasa

Hiroaki Ue

Ken Iinuma

Atsushi Urayama

Tomohiko Kaneko

An active antivibration device which includes a main body, a mobile element which is elastically supported inside the main body and movable in an axial direction of the main body, and a coil which is disposed inside the main body and fixed to the main body. The mobile element includes a mobile axis body supported in the axial direction of the main body, and a first yoke, a permanent magnet and a second yoke which are held by the mobile axis body and disposed successively along an axial direction of the mobile axis body. The permanent magnet is magnetized in the axial direction of the mobile axis body and disposed between the first yoke and the second yoke.

Active antivibration device and manufacturing method for the same

A yoke of an actuator of an active vibration isolation support system, which controls an internal pressure of a liquid chamber by reciprocally oscillating a movable core by energizing a coil, includes a cylindrical portion and a flange portion. The cylindrical portion is disposed on an outer side of the yoke in a radial direction and faces an inner peripheral surface of the coil, while the flange portion faces an end surface of the coil. The yoke further includes an inner inclined surface formed in an inner side of an intersection of the cylindrical portion and the flange portion, and inclined in such a manner that an outer side thereof in the radial direction with respect to an axis of an actuator inclines upward. Accordingly, the vector of a magnetic flux generated through the energization of the coil can be oriented toward the movable core from the flange portion of the yoke via the inner inclined surface thereof. The magnetic flux is thus allowed to flow smoothly from the yoke to the movable core, so that the efficiency of the magnetic circuit is enhanced. As a result, the operational response of the actuator can be improved.

Active vibration isolation support system

There is provided a system for readily and efficiently fabricating a wound coil composed of a bobbinless coil. The system includes a coil winding device having an upper jig to which an upper plate is attached and a lower jig to which a lower plate is attached which are provided so as to be relatively displaceable and a tension device for applying predetermined tension to a wire rod fed from a wire rod supplying source. The coil winding device is provided with a claw section having first through third split claws that function as a winding section around which the wire rod is wound between the upper and lower plates and that slide in a radial direction when the upper jig is assembled coaxially with the lower jig.

Coil winding system and method for fabricating molded coil

Method for fabricating molded coil

In an active vibration isolation support system in which internal pressures of fluid chambers whose volumes are changed by a load applied from outside are controlled by an actuator that reciprocatingly vibrates a movable core on an axis by energizing a coil cylindrically wound around an outer periphery of a fixed core, an end surface of the coil on the fluid chambers side is inclined so that a radially outer side of the end surface is close to the fluid chambers with respect to the axis. Therefore, the output can be increased by increasing the number of windings of the coil without increasing the dimension of the active vibration isolation support system in the direction of the axis. Also, if the number of windings of the coil is made the same as that of the conventional system, the outer diameter of the coil can be made smaller than that of the conventional system accordingly to reduce the entire length of wire of the coil, thereby reducing the resistance and inductance to improve the electrical current response.

In an electromagnetic actuator including a bearing member which slidably supports a variable core, a yoke for retaining a coil assembly by cooperation with a bottom wall of a housing is connected to the housing, and the bearing member is fitted into the yoke. A support for supporting an outward-facing flange formed at one end of the bearing member is mounted on the bottom wall, and a set spring for biasing the outward-facing flange toward the support is mounted under compression between the outward-facing flange and the first yoke. A low-friction material coating made of a fluorocarbon resin is formed on at least one of opposed sliding surfaces of the bearing member and a movable core. Thus, even if wear powder is generated between the set spring of the bearing member and a portion on which the set spring is pressed, the wear powder is prevented from entering inside the bearing member.

Electromagnetic actuator

An electromagnetic actuator includes a fixed core supported by a bottom wall of a housing, a movable core arranged opposite to the fixed core via an air gap to drive the movable member, and coil assembly supported by the housing to surround both the cores, wherein the movable member and the movable core are connected by connecting means for adjusting the air gap between the fixed core and the movable core, and wherein an adjustment operating hole through which the connecting means is adjusted is provided on the fixed core so as to be opened outside the bottom wall of the housing. Thus, it is possible to freely adjust the air gap between the fixed core and the movable core without preparing several types of connecting members.

A sealing member which seals a sealed space where a movable core of an electromagnetic actuator is arranged, includes: an inner ring portion and an outer ring portion which are respectively arranged inside and outside in the radial direction, come into contact with the upper surface of a flange of a fixed core and the lower surface of a coil assembly, and are compressed therebetween; and a thin connection portion integrally connecting the inner and outer ring portions. Therefore, the inner and outer ring portions are compressed and escape toward the upper and lower surfaces of the thin connection portion, whereby the axial thickness of the sealing member can be reduced in an assembled state while securing the sealability of the sealing member. As a result, even if the number of windings of the conducting wire is equal to the conventional device, the diameter of the coil and the entire length of the conducting wire are reduced, whereby the resistance and the inductance of the coil are reduced to improve magnetic response.

An active type vibration isolating support system includes: an elastic body for elastically supporting a vibratory body; a liquid chamber to be defined by the elastic body; a movable member for changing capacity of the liquid chamber; and an actuator for driving the movable member. The actuator has: a fixed core; a movable core coupled to the movable member for being arranged opposite to the fixed core via an air gap; and a coil for generating an electromagnetic attracting force between the fixed and movable cores. The movable member and the movable core are coupled together through coupling units capable of adjusting the air gap. Thus, without preparing several types of coupling members, it is possible to obtain a desired vibration isolating characteristic by freely adjusting the air gap between the fixed core and the movable core.

Growing community of inventors

Miyagi, Japan

Hirozumi Kon