Railway Technical Research Institute

www.rtri.or.jp
Tokyo, Japan

Railway Technical Research Institute , or RTRI , is the technical research company under the Japan Railways group of companies. Wikipedia.


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Patent
Nippon Steel & Sumitomo Metal Corporation, Railway Technical Research Institute and Fine Sinter Co. | Date: 2014-04-09

A disc brake for railway vehicles includes: a brake disc fixed to a wheel or an axle of a railway vehicle; and a brake lining configured to be pressed against a frictional surface of the brake disc by a brake caliper, the brake lining including: a plurality of friction members arranged to be spaced from each other, each of the friction members having a surface that faces the frictional surface of the brake disc; a metallic backing secured to back surfaces of the friction members; and a base plate supporting the friction members on the back surface side via spring members, the base plate being mounted to a brake caliper; wherein the friction members are provided in pairs with each pair being formed by two adjacent ones of the friction members, and the metallic backing is a one-piece member provided for each pair of the friction members. The thus configured disc brake can achieve uniform contact pressure between the brake lining and the brake disc during braking operation while at the same time achieving a stable coefficient of friction between them, so that the durability and reliability are enhanced.


Patent
Railway Technical Research Institute and Nippon Steel & Sumitomo Metal Corporation | Date: 2016-09-07

A vehicle brake apparatus includes a first pressure control device that transforms a first compressed air inside a first tank provided in a vehicle body on a bogie of a vehicle into a brake control air having a predetermined pressure and supplies the brake control air to a brake cylinder which applies braking force to a wheel provided on the bogie. The vehicle brake apparatus includes: a second tank that is installed on the bogie and is independent from the first tank; and a second pressure control device that supplies a second compressed air inside the second tank to the brake cylinder as an emergency brake air prior to the brake control air being supplied from the first pressure control device to the brake cylinder when an emergency brake operation is performed.


Patent
Meidensha and Railway Technical Research Institute | Date: 2013-03-06

Provided is a contact force measurement method and a contact force measurement device with which the contact force of a pantograph can be measured using image processing, even for pantographs with a structure that prevents the collector head and spring from being directly photographed. Images of a pantograph (100) are captured, a plurality of springs (102) is combined, and a virtually synthesized spring (1) is deemed to exist in the center of the pantograph (100) in the width direction. From the images, the partial relative displacement between the position corresponding to a collector head (101) in the center of the pantograph (100) in the width direction and a collector head support (104) is calculated. The elasticity of the virtually synthesized spring (1) is calculated by determining the difference between the relative displacement and the natural length of the virtually synthesized spring (1). The spring reaction force is determined by multiplying the spring constant of the virtually synthesized spring (1) by the elasticity, the lifting force action on the collector head is determined from the vehicle travel speed data when the images and time have been synthesized, and the spring reaction force, inertia force, and lifting force are then added to determine the contact force.


Patent
Railway Technical Research Institute | Date: 2016-09-23

An on-board device controls the speed of the control target train so that the control target train is set to a given speed-controlled state upon reception of the earthquake detection signal, the given speed-controlled state being a state in which the speed of the control target train is set to be equal to or lower than a reduced speed, or the control target train is stopped. A speed control part estimates an estimated position and an estimated timing at which the control target train is set to a speed-controlled state when a given brake is continuously applied, and controls the speed of the control target train based on the positional relationship between the estimated position and the recommended avoiding-train-existence section when there is a time allowance between the estimated timing and the estimated earthquake arrival timing.


Patent
Railway Technical Research Institute and Nippon Steel & Sumitomo Metal Corporation | Date: 2016-06-22

A brake disc of the present invention is a brake disc that stops the rotation of an axle when a brake pad is pressed on a surface of the brake disc, including a disc main body that is attached to a rotary body integrally rotating with the axle; and a plurality of build-up layers laminated on a surface of the disc main body, in which the build-up layers are laminated on the surface of the disc main body by means of laser metal deposition welding.


Patent
Railway Technical Research Institute and Meidensha | Date: 2016-01-13

An overhead line position measuring apparatus which also enables contactless three-dimensional position measurement using an inspection car as to an overhead line other than a contact wire. The overhead line position measuring apparatus includes: first and second three-dimensional measuring devices; first and second cameras; a region of interest setting part for setting at least one region of interest based on angle data and distance data generated by each of the first and second three-dimensional measuring devices; an image processing part for performing image processing on each of first and second image data respectively generated by the first and second cameras to mask the image except for the region of interest, and accumulating the first and second image data into amemory; an overhead line extracting part for extracting an overhead line satisfying a predetermined condition from a two-dimensional image represented by each of the accumulated first and second image data; and an overhead line position calculating part for calculating a position of the overhead line in relation to the railway vehicle based on coordinates of the overhead line extracted by the overhead line extracting part.


Patent
Railway Technical Research Institute and Nippon Steel & Sumitomo Metal Corporation | Date: 2014-09-12

A brake disc of the present invention is a brake disc that stops the rotation of an axle when a brake pad is pressed on a surface of the brake disc, including a disc main body that is attached to a rotary body integrally rotating with the axle; and a plurality of build-up layers laminated on a surface of the disc main body, in which the build-up layers are laminated on the surface of the disc main body by means of laser metal deposition welding.


Patent
Mayekawa Manufacturing Co. and Railway Technical Research Institute | Date: 2016-02-03

Provided is a cooling device for a superconductive cable which can be installed in a limited installation space with an efficient arrangement. A cooling device (10) cools a superconducting cable (11), by supplying and circulating a refrigerant. The cooling device (10) includes a reservoir tank (12) which stores the refrigerant, a circulation pump unit (13) which pumps the refrigerant, and a cooling unit (14) which cools the refrigerant. The circulation pump unit and the cooling unit are accommodated in the reservoir tank, whereby a compact cooling device can be achieved.


Patent
Railway Technical Research Institute | Date: 2014-11-21

There is provided a high-temperature superconducting (HTS) coil and a method of manufacturing the same, allowing simple and excellent affixation between side panels for cooling the superconducting coil and the HTS coil while inhibiting delamination of an HTS wire. The method of manufacturing the HTS coil including the rare-earth-based HTS wire of the superconducting coil and side panels for cooling the superconducting coil which are affixed thereto, windings of the rare-earth-based HTS wire of the superconducting coil being separated between turns, includes: utilizing a tape-like polytetrafluoroethylene (PTFE) film 3 as an insulator between the windings of the rare-earth-based HTS wire 2 to form a PTFE-film co-wound superconducting coil; impregnating the PTFE-film co-wound superconducting coil 4 with epoxy resin 6; and affixing the side panels 5 to the-PTFE film co-wound superconducting coil 4.


Patent
Mayekawa Manufacturing Co. and Railway Technical Research Institute | Date: 2014-10-22

A superconducting cable comprises a superconductor 60, two or more coolant passages including an outgoing coolant passage 12 and a returning coolant passage 14 that transfer a coolant that cools the superconductor, and a heat insulating pipe 10 inside which the superconductor 60 and the coolant passages are formed. For the coolant passages, by a double structured tube of an inner tube 6 and an outer tube 8, the outgoing coolant passage 12 is formed in the internal space of the inner tube 6 and the returning coolant passage 14 is formed in the space between the inner tube 6 and the outer tube 8, the inner tube 6 is formed between the outgoing coolant passage 12 and the returning coolant passage 14 of a heat insulating material, the superconductor 60 is disposed on the outer circumferential side of the inner tube 6, and the superconductor is cooled by the coolant that flows through the returning coolant passage.

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