Mechano Transformer Corporation

Nec Corporation

Bridgestone Corporation

Satake Corporation

Nippon Electric Co., Ltd.

The Research Institute for Electric and Magnetic Materials

Omron Corporation

Nec Home Electronics, Inc.

Aichi Tokei Denki Co., Ltd.

Kimmon Manufacturing Co., Ltd.

Kuroda Pneumatics Limited

Takeshi Yano

Sze Keat Chee

Toshiro Higuchi

Izumu Fukui

Takafumi Ito

Eiichi Sato

Takeshige Hamatsuki

Osamu Inui

Nobukiyo Kobayashi

Teruhiko Takeuchi

Seiichiro Kanazawa

Akio Yano

Atsushi Ochi

Tadashi Matsushita

Sadayuki Takahashi

Kiwamu Shirakawa

Takehiro Futami

Susumu Ishizaki

Takeshi Kamima

Hiroaki Yamada

Tsuyoshi Masumoto

Kazuaki Utsumi

Shinichi Hori

Masaaki Yamamoto

Masaaki Nakamura

Masatomo Yonezawa

Naoto Okazaki

Tomotaka Sakiyama

Toshitada Hirata

Norimasa Ikeda

Shoji Oida

Shigehiro Ohnuma

Masashi Konno

Toru Kumasaka

Yuichi Kariya

Hiroyuki Mori

Jun Fukui

Hironori Arii

Seiji Itai

Kazuo Yakuwa

Seiichi Fujimura

Tetsuo Hayashi

Yasuyuki Ishiyama

Katsuhisa Toshima

Yutaka Hasegawa

Masaharu Sakanaka

Kenichi Kudoh

Tsunehiko Shibata

A displacement magnifying mechanism includes a base portion serving as a substrate; a first attachment portion and a second attachment portion which are provided on a surface on one side of the base portion; a first piezoelectric element and a second piezoelectric element of which one ends are attached to the first attachment portion and the second attachment portion; an operating portion which is connected to the other ends of the first piezoelectric element and the second piezoelectric element and generates a displacement due to expansion and contraction of the piezoelectric element; and a link portion which is disposed at the center between the first piezoelectric element and the second piezoelectric element, links the operating portion and the base portion, and is made of a material having a higher Young's modulus than that of the first piezoelectric element and the second piezoelectric element.

Displacement magnifying mechanism, polishing device, actuator, dispenser, and air valve

To provide a valve control device, a drive control device, and a fluid control device, which are suitable for adjusting a valve. The valve control device comprises: a rod-shaped rotor provided so as to rotate about a rotation axis, wherein one end of the rotor is directly or indirectly connected to a valve body, at least a part of the valve body being positioned in a flow path for fluid, wherein the rotor changes a relative position between the valve body and a valve seat that is closed by the valve body or a contact force between the valve body and the valve seat; a pair of contacts for sandwiching the rotor and for rotating the rotor; a moving unit comprising a piezoelectric element for causing the pair of contacts to perform relative movement; and a drive control unit for controlling the relative position between the valve body and the valve seat or the contact force between the valve body and the valve seat by applying a voltage waveform having a rising slope and a falling slope different from the rising slope to the piezoelectric element so as to cause the pair of contacts to rotate the rotor in a desired direction, wherein a steeper slope of the rising slope and the falling slope causes a slip between the rotor and the pair of contacts.

Valve control device, drive control device, and fluid control device

A wear amount estimation device estimates plural kinds of wear energy depending on each of an internal pressure of aircraft tires, a load acting on the aircraft tires, a velocity of an aircraft, a slip angle caused in the aircraft tires, and a braking force of the aircraft, in accordance with each of these elements and wear energy EFR of the aircraft tires in a state of a free rolling run The wear amount estimation device estimates the wear amount wear of the aircraft tires in accordance with each of the calculated wear energy and a wear resistance R indicating a relationship between predetermined wear energy and a predetermined wear amount.

Wear amount estimation method, wear amount estimation device, and wear amount estimation program

A piezoelectric valve, having superior responsiveness during valve opening and capability to stabilize gas supply at an early stage, includes a gas pressure chamber receiving compressed gas and an exhaust path discharging the compressed gas from the gas pressure chamber; a valve disc placed in the gas pressure chamber to open and close the exhaust path; a piezoelectric element generating a driving force for operation of the valve disc, as a displacement; a displacement magnifying mechanism magnifying the displacement of the piezoelectric element and applying the magnified displacement to the valve disc; and driving means including a signal generator generating a signal including a first prepulse, a second prepulse, and a main pulse, applies a drive voltage to the piezoelectric element using the signal generated by the signal generator, as an input signal to a drive circuit, and drives and opens the valve disc by expanding the piezoelectric element.

Piezoelectric valve, method for driving piezoelectric valve, and optical particulate separator equipped with air-jet means using piezoelectric valve

An object is to, in an aircraft tire, promote heat dissipation from circumferential direction grooves of a tread and improve durability of the tire. Plural circumferential direction grooves (central side circumferential direction grooves (), edge portion side circumferential direction grooves ()) that extend in a tire circumferential direction are formed in a tread (). In a tire circumferential direction cross-section, a groove bottom () of at least one of the circumferential direction grooves has a wave shape having amplitude in a tire radial direction.

Aircraft tire

A piezoelectric valve stably supplies gas even for a long gas ejection time, with a high responsivity to opening the valve, is provided. The piezoelectric valve, including a gas-pressure-chamber for receiving a compressed gas supplied from outside, a gas-discharge-channel through which the compressed gas is discharged from the gas-pressure-chamber, comprises: a valve body disposed in the gas-pressure-chamber and opens/closes the gas-discharge-channel; a piezoelectric element for producing a driving force to move the valve body as a displacement; a displacement-enlarging-mechanism for enlarging the displacement of the piezoelectric element to act on the valve body; and a driving unit having a signal-generating-unit for generating a signal comprising a pre-pulse and a main pulse and provides the signal generated by the signal-generating-unit to a driving circuit as an input signal to apply a driving voltage to the piezoelectric element to make the piezoelectric element expand and drive the valve body open.

Piezoelectric valve, and optical particulate matter sorter provided with air-blowing means that uses piezoelectric valve

A piezoelectric valve whose assembly work can be efficiently performed. A piezoelectric valve according to this invention includes a valve main body having a gas pressure chamber which receives compressed gas supplied from the outside, a plate which is disposed inside the valve main body and is fixed to the valve main body, and actuators each of which has a valve element, a piezoelectric element generating, in the form of a displacement, driving force required for operation of the valve element, and a displacement magnification mechanism for magnifying a displacement of the piezoelectric element and causing the magnified displacement to act on the valve element, are fixed to each of two surfaces of the plate, and are disposed inside the valve main body together with the plate.

Piezoelectric valve, and optical granulated substance sorter equipped with air-blowing means that uses this piezoelectric valve

An optical granular material-sorting apparatus includes: a transfer means for transferring objects being sorted; an optical detection means for detecting, at a detection position, objects being sorted as they drop from an end of the transfer means; and a blasting means provided below the optical detection means and designed to blow away objects being sorted through blasting of air based on the result of detection by the optical detection means. The blasting means has a piezoelectric valve which is driven by a driving means to blast air based on the result of detection by the optical detection means. The driving means applies voltage to a piezoelectric element in multiple stages so as to suppress fluctuation in the amount of gas ejected from a gas release channel when the valve opens.

Optical granular material-sorting apparatus utilizing piezoelectric valve

A piezoelectric valve comprising: a valve main body formed in which are a gas pressure chamber that takes in compressed gas supplied from the outside as well as a gas release channel through which the compressed gas is released from the gas pressure chamber; a valve body placed in the gas pressure chamber to open and close the gas release channel; a piezoelectric element that generates, in the form of displacement, a driving force needed to operate the valve body; at least one displacement amplification mechanism that amplifies a displacement of the piezoelectric element and causes it to act upon the valve body; and a driving means for applying voltage to the piezoelectric element in order to drive the valve body to open the valve and thereby open the gas release channel; wherein such piezoelectric valve is characterized in that the driving means applies voltage to the piezoelectric element in multiple stages so as to suppress fluctuation in the amount of gas ejected from the gas release channel when the valve opens.

Piezoelectric valve and optical granular material-sorting apparatus utilizing such piezoelectric valve

The present invention relates to a method of measuring and evaluating rigidity of a target object or mechanical output, such as force, displacement, and mechanical energy generated by a piezoelectric actuator and applied to the target object, according to only a measured value of electric quantity without use of a mechanical sensor, and a method of controlling the piezoelectric actuator, and a device using these methods. Steps of finding equivalent circuit constants of the piezoelectric actuator; applying a voltage to the piezoelectric actuator and measuring electrical quantity flowing into the piezoelectric actuator due to the applied voltage, or applying an electric charge to the piezoelectric actuator and measuring voltage applied to the piezoelectric actuator due to the applied electric charge; and measuring and evaluating one or more of force, displacement, or mechanical energy generated by the piezoelectric actuator and applied to a target object, or rigidity of a target object are included. While these values are measured and evaluated minutely, applied voltage and electrical quantity are adjusted and controlled.

Method of measuring and evaluating mechanical outputs of piezoelectric actuators, controlling method of the same, and apparatus using those methods

This invention provides a radial tire for aircraft comprising a belt composed of a plurality of belt layers, wherein a total strength of the belt T[N] in a circumferential direction over its full width satisfies T/WD&#x2267;1.5&#xd7;10in which D [m] is an outer diameter of the tire and W [m] is a width of the tire, the belt is composed of at least two belt layers each containing organic fiber cords with an elongation in an extension direction under a load of 3.2 cN/dtex of 2.2-9.3%, a protection belt layer having a circumferential stiffness lower than that of the belt is disposed at an outside of the belt in a radial direction, a ratio of the circumferential stiffness of the protection belt layer to the circumferential stiffness of the belt is less than 0.5, and the protection belt layer is composed of organic fiber cords having a tensile strength at break of not less than 6.3 cN/dtex and a heat shrinkage factor of 0.5-5.0%, whereby a durability of a tread portion can be improved without damaging an excellent durability against foreign matters.

Radial tire for aircraft

In a magnetic coupler device comprising: a magnetic field generation circuit generating a magnetic field according to an input current; and a detection bridge circuit including a pair of magnetoresistance effect devices, a resistance value of each of the magnetoresistance effect devices changing by applying a magnetic field generated by said magnetic field generation circuit to each of the magnetoresistance effect devices, and having two outputs between which a voltage difference is generated according to an intensity of the magnetic field generated by said magnetic field generation circuit, by forming a geometric shape of each of said magnetic field generation circuit and said detection bridge circuit in line symmetric or point symmetric, a high S/N ratio is obtained even with high frequency.

Magnetic coupler device and magnetically coupled isolator

A radial tire for airplane comprises a pair of bead cores, a radial carcass, and a belt disposed on an outer periphery of a crown portion of the radial carcass and comprised of plural belt layers each containing organic fiber cords, in which a total strength in a circumferential direction over a full width of the belt T(N) satisfies T/WD&#x2267;1.5&#xd7;10when an outer diameter of the tire is D (m) and a width of the tire is W (m), and at least one layer of the belt layers is constituted with an organic fiber cord spirally winding at an angle of approximately 0&#xb0; with respect an equatorial plane of the tire and satisfying the following equations (I) and (II):&#x3c3;&#x2267;&#x2212;0.01+1.2&#x2003;&#x2003;(I)&#x3c3;&#x2267;0.02&#x2003;&#x2003;(II)(wherein &#x3c3; is a heat shrinkage stress at 177&#xb0; C. (cN/dtex) and E is an elastic modulus at 25&#xb0; C. under a load of 49 N (cN/dtex)).

Radial tire for airplane

A radial tire for airplane comprises a pair of bead cores, a radial carcass, and a belt disposed on an outer periphery of a crown portion of the radial carcass and comprised of plural belt layers each containing organic fiber cords, in which a total strength in a circumferential direction over a full width of the belt T(N) satisfies T/WD&#x2267;1.5&#xd7;10when an outer diameter of the tire is D (m) and a width of the tire is W (m), and at least one layer of the belt layers is constituted with an organic fiber cord extending zigzag in the circumferential direction and satisfying the following equations (I) and (II):&#x3c3;&#x2267;&#x2212;0.01+1.2&#x2003;&#x2003;(I)&#x3c3;&#x2267;0.02&#x2003;&#x2003;(II)(wherein &#x3c3; is a heat shrinkage stress at 177&#xb0; C. (cN/dtex) and E is an elastic modulus at 25&#xb0; C. under a load of 49 N (cN/dtex)).

Radial tire for airplane with zigzag belt cord having specified heat shrinkage stress

In the pneumatic radial tire of the present invention, a total strength Kof a belt layerin a circumferential direction of the tire per unit of width at a tire equator surface position Pis set greater than a total strength of the belt layerin the circumferential direction of the tire per unit of width at a width position Pcorresponding to &#x2154; of a maximum width of the belt layer having the tire equator surface CL as a center.

Pneumatic radial tire with specified belt layer

Growing community of inventors

Tokyo, Japan

Takeshi Yano