RAILCAR STEERING BOGIE INCLUDING BRAKE UNIT

A railcar steering bogie includes a bogie frame, a wheelset, an axle box suspension, a steering mechanism configured to steer the wheelset, a brake unit, and a brake unit support link. The brake unit includes: a main body frame; a brake shoe supported by the main body frame and pressed against a wheel tread of the wheel during braking. The brake unit support link couples the axle box suspension and the brake unit and transmits displacement of the axle box in a car longitudinal direction to the brake unit at least during steering performed by the steering mechanism. The brake unit support link restricts the brake unit from being displaced outward in a car width direction by a predetermined distance or more during the braking. At least one of a side surface of the brake unit support link and a side surface of the brake unit includes a sliding surface. 1. A railcar steering bogie comprising:a bogie frame;a wheelset including an axle and a pair of wheels;an axle box suspension coupling an axle box and the bogie frame, the axle box accommodating a bearing supporting the axle;a steering mechanism configured to steer the wheelset; a main body frame including an upper portion rotatably attached to the bogie frame and', 'a brake shoe supported by the main body frame and pressed against a wheel tread of the wheel during braking; and, 'a brake unit including'}a brake unit support link coupling the axle box suspension and the brake unit and configured to transmit displacement of the axle box in a car longitudinal direction to the brake unit at least during steering performed by the steering mechanism,the brake unit support link restricting the brake unit from being displaced outward in a car width direction by a predetermined distance or more during the braking,at least one of a side surface of the brake unit support link and a side surface of the brake unit including a sliding surface.2. The railcar steering bogie according to claim 1 , wherein the other of the side surface of ...

STATE MONITORING DEVICE FOR PLATE SPRING OF RAILCAR BOGIE

A state monitoring device for a plate spring mounted on a railcar bogie is configured to monitor a state of the plate spring, the plate spring including fiber-reinforced resin containing electrically conductive reinforced fibers containing reinforced fibers extending in a longitudinal direction of the plate spring. The state monitoring device includes: an electrode pair provided at both width direction side end surfaces of the plate spring and sandwiching the plate spring, a width direction of the plate spring being perpendicular to the longitudinal direction of the plate spring and a thickness direction of the plate spring; and a measuring unit electrically connected to the electrode pair and configured to measure an electrical characteristic of the plate spring. 1. A state monitoring device for a plate spring mounted on a railcar bogie ,the state monitoring device being configured to monitor a state of the plate spring, the plate spring including fiber-reinforced resin containing electrically conductive reinforced fibers containing reinforced fibers extending in a longitudinal direction of the plate spring,the state monitoring device comprising:an electrode pair provided at both width direction side end surfaces of the plate spring and sandwiching the plate spring, a width direction of the plate spring being perpendicular to the longitudinal direction of the plate spring and a thickness direction of the plate spring; anda measuring unit electrically connected to the electrode pair and configured to measure an electrical characteristic of the plate spring.2. The state monitoring device according to claim 1 , wherein to detect delamination between a first fiber-reinforced resin layer of the plate spring and a second fiber-reinforced resin layer of the plate spring claim 1 , the electrode pair is provided at both width direction side end surfaces of the first fiber-reinforced resin layer claim 1 , electrical resistance of the second fiber-reinforced resin layer to ...

RAILCAR BOGIE INCLUDING PROTECTIVE FILM AND PROTECTIVE FILM-EQUIPPED PLATE SPRING

A railcar bogie includes: a protection target member of the railcar bogie; and a protective film including an adhesive surface stuck to the protection target member. The protective film is configured such that an impact absorbing layer and a flame-retardant layer are laminated in this order from the protection target member side. The impact absorbing layer is thicker than the flame-retardant layer. 1. A railcar bogie comprising:a protection target member; anda protective film including an adhesive surface stuck to the protection target member, wherein:the protective film is configured such that an impact absorbing layer and a flame-retardant layer are laminated in this order from the protection target member side; andthe impact absorbing layer is thicker than the flame-retardant layer.2. The railcar bogie according to claim 1 , wherein:an adhesive layer including the adhesive surface is laminated on the impact absorbing layer from the protection target member side; andadhesive force of the adhesive layer with respect to the protection target member is smaller than adhesive force of the impact absorbing layer with respect to the adhesive layer.3. The railcar bogie according to claim 1 , wherein adhesive force of the adhesive surface with respect to the protection target member is 5 N/20 mm or more and 35 N/20 mm or less.4. The railcar bogie according to claim 1 , wherein:a colored layer is laminated between the flame-retardant layer and the impact absorbing layer; andthe flame-retardant layer is transparent or semitransparent.5. The railcar bogie according to claim 1 , wherein the flame-retardant layer is resin selected from polyimide and vinyl chloride claim 1 , thermoplastic resin containing a flame retardant claim 1 , a glass fiber sheet claim 1 , or a metal film.6. The railcar bogie according to claim 5 , wherein a thickness of the flame-retardant layer is 10 μm or more and 400 μm or less.7. A protective film-equipped plate spring for a railcar bogie claim 5 , ...

PLATE SPRING UNIT AND RAILCAR BOGIE

A plate spring unit applied to a railcar bogie includes: a lower plate spring including both longitudinal direction end portions supported by the respective axle boxes from below, the lower plate spring being made of fiber-reinforced resin; an upper plate spring arranged above the lower plate spring with a gap and including a middle portion pressed from above by a pressing member provided at the cross beam, the upper plate spring being made of fiber-reinforced resin; a middle spacer sandwiched between a middle portion of the lower plate spring and the middle portion of the upper plate spring; and an end spacer sandwiched between the end portion of the lower plate spring and an end portion of the upper plate spring and allowing relative displacement between the end portion of the lower plate spring and the end portion of the upper plate spring in a longitudinal direction. 1. A plate spring unit applied to a railcar bogie , both longitudinal direction end portions of the plate spring unit being supported by respective axle boxes from below , a longitudinal direction middle portion of the pate spring unit supporting a cross beam from below ,the plate spring unit comprising:a lower plate spring including both longitudinal direction end portions supported by the respective axle boxes from below, the lower plate spring being made of fiber-reinforced resin;an upper plate spring arranged above the lower plate spring with a gap and including a middle portion pressed from above by a pressing member provided at the cross beam, the upper plate spring being made of fiber-reinforced resin;a middle spacer sandwiched between a middle portion of the lower plate spring and the middle portion of the upper plate spring; andan end spacer sandwiched between the end portion of the lower plate spring and an end portion of the upper plate spring and allowing relative displacement between the end portion of the lower plate spring and the end portion of the upper plate spring in a ...

RAILROAD VEHICLE PROVIDED WITH LOW ROOF STRUCTURE

A railroad vehicle where an air conditioner can be installed in an upper part of a roof thereof includes a roof structure having an opening, and a low roof main body having a recessed part provided in the opening, and recessed in a cross section, the air conditioner being able to be placed on the recessed part, and an edge part of the low roof main body which is continuously formed from the low roof main body and joined to the roof structure. The low roof main body and the edge part of the low roof main body are made of plastic.

METHOD OF PRODUCING PLATE SPRING FOR RAILCAR BOGIE

A method of producing plate springs for a railcar bogie, the plate springs each extending in a car longitudinal direction and elastically supporting a cross beam while being supported by an axle box in the railcar bogie, the axle box accommodating a bearing for an axle, the method includes: a molding step of molding a mother plate made of fiber-reinforced resin, the mother plate including a layer made of continuous fibers oriented in a first direction when viewed from a normal direction of a main surface of the mother plate; a cut position determining step of determining positions of a plurality of parallel cut lines for cutting the mother plate along the first direction; and a cutting step of cutting the mother plate along the plurality of cut lines to take out the plate springs made of the fiber-reinforced resin. 1. A method of producing plate springs for a railcar bogie ,the plate springs each extending in a car longitudinal direction and elastically supporting a cross beam while being supported by an axle box in the railcar bogie, the axle box accommodating a bearing for an axle,the method comprising:a molding step of molding a mother plate made of fiber-reinforced resin, the mother plate including a layer made of continuous fibers oriented in a first direction when viewed from a normal direction of a main surface of the mother plate;a cut position determining step of determining positions of a plurality of parallel cut lines for cutting the mother plate along the first direction; anda cutting step of cutting the mother plate along the plurality of cut lines to take out the plate springs made of the fiber-reinforced resin.2. The method according to claim 1 , further comprising a defect inspecting step of inspecting the mother plate to specify a position of a defect portion claim 1 , whereinin the cut position determining step, the positions of the plurality of cut lines are determined such that the specified position of the defect portion is excluded from a ...

FIELD ROTOR OF SUPERCONDUCTING ROTATING MACHINE

A field rotor of a superconducting rotating machine including: a rotation shaft; a supply shaft that supplies a refrigerant to the rotation shaft at one end of the rotation shaft; an input/output shaft provided at the other end of the rotation shaft so as to integrally rotate with the rotation shaft; and a superconducting coil held on a circumferential surface of the rotation shaft to be cooled by the refrigerant, wherein the supply shaft and the input/output shaft are fixed to each other so as to rotate integrally with each other, and the rotation shaft and the supply shaft are at least partly brought in contact with each other in order to allow the rotation shaft to be supported by the supply shaft and in order to be slidably fitted to each other in a circumferential direction of the rotation shaft and in an axial direction of the rotation shaft. 1. A field rotor of a superconducting rotating machine comprising:a rotation shaft;a supply shaft that supplies a refrigerant to the rotation shaft at one end of the rotation shaft;an input/output shaft provided at the other end of the rotation shaft so as to integrally rotate with the rotation shaft; anda superconducting coil held on a circumferential surface of the rotation shaft to be cooled by the refrigerant, whereinthe supply shaft and the input/output shaft are fixed to each other so as to rotate integrally with each other, andthe rotation shaft and the supply shaft are at least partly brought in contact with each other in order to allow the rotation shaft to be supported by the supply shaft and in order to be slidably fitted to each other in a circumferential direction of the rotation shaft and in an axial direction of the rotation shaft.2. The field rotor of a superconducting rotating machine according to claim 1 , whereinthe supply shaft and the rotation shaft are disposed such that one of them having relatively a large thermal contraction amount in a diameter direction upon a change from a room-temperature ...

METHOD OF PRODUCING ELECTRODE-EQUIPPED PLATE SPRING OF RAILCAR BOGIE

A method of producing an electrode-equipped plate spring of a railcar bogie includes: a resin removing step of partially irradiating a surface of fiber-reinforced resin, prepared by including electrically conductive fibers in resin, of a plate spring with a laser beam to partially remove the resin and partially expose the electrically conductive fibers; and an electrode forming step of attaching an electrode to an exposed region formed by partially exposing the electrically conductive fibers of the fiber-reinforced resin. 1. A method of producing an electrode-equipped plate spring of a railcar bogie ,the method comprising:a resin removing step of partially irradiating a surface of fiber-reinforced resin, prepared by including electrically conductive fibers in resin, of a plate spring with a laser beam to partially remove the resin and partially expose the electrically conductive fibers; andan electrode forming step of attaching an electrode to an exposed region formed by partially exposing the electrically conductive fibers of the fiber-reinforced resin.2. The method according to claim 1 , wherein the resin has a light transmission property claim 1 , and the electrically conductive fibers have a light absorption property.3. The method according to claim 1 , wherein the resin has a light absorption property.4. The method according to claim 2 , wherein in the resin removing step claim 2 , the laser beam scans in an extending direction of the electrically conductive fibers when viewed from an irradiation direction of the laser beam.5. The method according to claim 1 , wherein in the electrode forming step claim 1 , the electrode is formed in such a manner that: a thermosetting electrically conductive material is applied to the exposed region; and the electrically conductive material is irradiated with the laser beam to be cured.6. The method according to claim 5 , wherein the common laser device for irradiation of the laser beam is used in the resin removing step and ...

AXLE BOX SUSPENSION OF RAILCAR BOGIE

An axle box suspension includes: an axle beam including an axle beam main body portion extending from the axle box in a car longitudinal direction and a pin portion projecting from a tip end of the axle beam main body portion in the car longitudinal direction; a tubular elastic bushing including an inner tube portion, an outer tube portion, and an elastic portion interposed between the inner tube portion and the outer tube portion, the inner tube portion being fitted to the pin portion; an adapter attached to the outer tube portion and coupling the axle beam and the bogie frame; and a first stopper attached to the pin portion and configured to, when the axle box is displaced relative to the bogie frame toward one side in the car longitudinal direction by a predetermined distance, contact the adapter to restrict displacement of the axle box. 1. An axle box suspension of a railcar bogie ,the axle box suspension coupling an axle box to a bogie frame, the axle box accommodating a bearing supporting an axle,the axle box suspension comprising: an axle beam main body portion extending from the axle box in a car longitudinal direction and', 'a pin portion projecting from a tip end of the axle beam main body portion in the car longitudinal direction;, 'an axle beam including'}a tubular elastic bushing including an inner tube portion, an outer tube portion, and an elastic portion interposed between the inner tube portion and the outer tube portion, the inner tube portion being fitted to the pin portion;an adapter attached to the outer tube portion and coupling the axle beam and the bogie frame; anda first stopper attached to the pin portion and configured to, when the axle box is displaced relative to the bogie frame toward one side in the car longitudinal direction by a predetermined distance, contact the adapter to restrict displacement of the axle box.2. The axle box suspension according to claim 1 , wherein:the first stopper and the elastic bushing are press-fitted to the ...

RAILCAR STEERING BOGIE

A railcar steering bogie includes: a bogie frame supporting a bolster such that the bolster is swingable relative to bogie frame about a vertical axis; two wheelsets; axle box suspensions including respective axle beams coupling corresponding axle boxes to bogie frame, the axle boxes accommodating respective bearings supporting corresponding axles; and a steering mechanism steering at least one of the two wheelsets in accordance with the bolster's swinging relative to the bogie frame. The steering mechanism includes: a steering lever configured to turn relative to the bogie frame about fulcrum axis; a coupling link coupling the bolster and steering lever and configured to operate in conjunction with the bolster's swinging relative to the bogie frame; and at least one steering link coupling steering lever and axle beam and configured to steer the corresponding wheelset by displacing corresponding axle box through the corresponding axle beam in conjunction with steering lever's turning. 1. A railcar steering bogie comprising:a bogie frame supporting a carbody or a bolster such that the carbody or the bolster is swingable relative to the bogie frame about a vertical axis;two wheelsets each including an axle and a pair of wheels;axle box suspensions including respective axle beams coupling corresponding axle boxes to the bogie frame, the axle boxes accommodating respective bearings supporting the corresponding axles; anda steering mechanism configured to steer at least one of the two wheelsets in accordance with the swinging of the carbody or the bolster relative to the bogie frame,the steering mechanism includinga steering lever configured to turn relative to the bogie frame about a fulcrum axis,a coupling link coupling the steering lever and the carbody or the bolster and configured to operate in conjunction with the swinging of the carbody or the bolster relative to the bogie frame, andat least one steering link coupling the steering lever and the corresponding axle ...

Railcar steering bogie

A railcar steering bogie includes: a bogie frame supporting a bolster such that the bolster is swingable relative to the bogie frame about a vertical axis; two wheelsets each including an axle and a pair of wheels; and a steering mechanism configured to steer at least one of the two wheelsets in accordance with the swinging of the bolster relative to the bogie frame. The steering mechanism includes: a steering lever configured to turn relative to the bogie frame about a fulcrum axis; a coupling link coupling the bolster and the steering lever and configured to operate in conjunction with the swinging of the bolster relative to the bogie frame; and a steering link coupled to the steering lever and configured to steer the wheelset in conjunction with the turning of the steering lever. The steering link is coupled to the steering lever by a pin member.

ULTRASONIC FLAW DETECTOR AND ULTRASONIC FLAW DETECTING METHOD FOR COMPOSITE MATERIAL

An ultrasonic flaw detector for a composite material constituted by a plurality of materials which are different in physical properties from one another includes: a section specifier configured to specify first and second sections of an RF signal of a reflected wave of an ultrasonic wave with which the composite material is irradiated, a material reflected wave being possibly generated in the first section, an interface reflected wave being possibly generated in the second section; a material flaw determiner configured to determine whether or not a value of the RF signal exceeds a positive first threshold in the first section; and an interface flaw determiner configured to determine whether or not the value of the RF signal falls below a negative second threshold in the second section. 1. An ultrasonic flaw detector for a composite material constituted by a plurality of materials which are different in physical properties from one another ,the ultrasonic flaw detector comprising:a section specifier configured to specify first and second sections of an RF signal of a reflected wave of an ultrasonic wave with which the composite material is irradiated, a material reflected wave being possibly generated in the first section, an interface reflected wave being possibly generated in the second section;a material flaw determiner configured to determine whether or not a value of the RF signal exceeds a positive first threshold in the first section; andan interface flaw determiner configured to determine whether or not the value of the RF signal falls below a negative second threshold in the second section.2. The ultrasonic flaw detector according to claim 1 , wherein an absolute value of the second threshold is larger than the first threshold.3. An ultrasonic flaw detecting method for a composite material constituted by a plurality of materials which are different in physical properties from one another claim 1 ,the ultrasonic flaw detecting method comprising:receiving an ...

RAILCAR STEERING BOGIE

A railcar steering bogie includes: a bogie frame including a cross beam; pair of axles; axle boxes accommodating bearings; axle box suspensions each including a coupling member coupling the corresponding axle box and bogie frame while allowing relative displacement in a car longitudinal direction; plate spring extending in the car longitudinal direction and including car longitudinal direction end portions extending obliquely upward along the car longitudinal direction and supported above the respective axle boxes and a car longitudinal direction middle portion unfixedly arranged under the cross beam; support seats including respective inclined upper surfaces and supporting the both respective longitudinal direction end portions of the plate spring; and gap bodies each provided between an upper surface of the corresponding axle box suspension and a lower surface of the corresponding support seat and configured to allow displacement of the axle box suspension and the support seat in the car longitudinal direction. 1. A railcar steering bogie comprising:a bogie frame including a cross beam supporting a carbody;a pair of axles arranged along a car width direction;axle boxes accommodating respective bearings rotatably supporting the respective axles;axle box suspensions each including a coupling member coupling the corresponding axle box and the bogie frame while allowing relative displacement of the bogie frame and the axle box in a car longitudinal direction;a plate spring extending in the car longitudinal direction and includingboth car longitudinal direction end portions extending obliquely upward along the car longitudinal direction and supported above the respective axle boxes anda car longitudinal direction middle portion arranged under the cross beam so as not to be fixed to the cross beam;support seats including respective inclined upper surfaces and supporting the both respective longitudinal direction end portions of the plate spring; andgap bodies each ...

Ultrasonic flaw detector and ultrasonic flaw detecting method for composite material

An ultrasonic flaw detector for a composite material constituted by a plurality of materials which are different in physical properties from one another includes: a section specifier configured to specify first and second sections of an RF signal of a reflected wave of an ultrasonic wave with which the composite material is irradiated, a material reflected wave being possibly generated in the first section, an interface reflected wave being possibly generated in the second section; a material flaw determiner configured to determine whether or not a value of the RF signal exceeds a positive first threshold in the first section; and an interface flaw determiner configured to determine whether or not the value of the RF signal falls below a negative second threshold in the second section.

Field rotor for superconducting rotating machine

A field rotor (100) of a superconducting rotating machine including: a rotation shaft (18); a supply shaft (10) that supplies a refrigerant to the rotation shaft at one end of the rotation shaft; an input/output shaft (24) provided at the other end of the rotation shaft so as to integrally rotate with the rotation shaft; and a superconducting coil (20) held on a circumferential surface of the rotation shaft to be cooled by the refrigerant, wherein the supply shaft and the input/output shaft are fixed to each other so as to rotate integrally with each other, and the rotation shaft and the supply shaft are at least partly brought in contact with each other in order to allow the rotation shaft to be supported by the supply shaft and in order to be slidably fitted to each other in a circumferential direction of the rotation shaft and in an axial direction of the rotation shaft.

Structure for tank dome flange section

The present invention can suppress a temperature increase of a low-temperature liquefied gas stored in a tank main body portion. A tank dome flange portion structure (21) is provided at a liquefied gas tank and includes: a tank main body portion configured to store a low-temperature liquefied gas; a tank dome (3) provided at an upper portion of the tank main body portion; a flange portion (22) projecting substantially horizontally from the tank dome (3); a tank cover (6) configured to cover the tank main body portion with a space (5) therebetween; and an expansion rubber portion (11) provided between the flange portion (22) and an upper opening edge portion of the tank cover (6) and configured to seal the space (5). A heat transfer suppressing material portion made of fiber reinforced plastic is provided at at least a predetermined portion of the flange portion (22), the predetermined portion being located between a side wall (3a) of the tank dome (3) and the expansion rubber portion (11).

Field rotor for superconducting rotating machine

Method of producing plate spring for railcar bogie

A method of producing plate springs for a railcar bogie, the plate springs each extending in a car longitudinal direction and elastically supporting a cross beam while being supported by an axle box in the railcar bogie, the axle box accommodating a bearing for an axle, the method includes: a molding step of molding a mother plate made of fiber-reinforced resin, the mother plate including a layer made of continuous fibers oriented in a first direction when viewed from a normal direction of a main surface of the mother plate; a cut position determining step of determining positions of a plurality of parallel cut lines for cutting the mother plate along the first direction; and a cutting step of cutting the mother plate along the plurality of cut lines to take out the plate springs made of the fiber-reinforced resin.

Plate spring unit and railroad vehicle bogie

A plate spring unit applied to a railcar bogie includes: a lower plate spring including both longitudinal direction end portions supported by the respective axle boxes from below, the lower plate spring being made of fiber-reinforced resin; an upper plate spring arranged above the lower plate spring with a gap and including a middle portion pressed from above by a pressing member provided at the cross beam, the upper plate spring being made of fiber-reinforced resin; a middle spacer sandwiched between a middle portion of the lower plate spring and the middle portion of the upper plate spring; and an end spacer sandwiched between the end portion of the lower plate spring and an end portion of the upper plate spring and allowing relative displacement between the end portion of the lower plate spring and the end portion of the upper plate spring in a longitudinal direction.

Railroad vehicle provided with low roof structure

A railroad vehicle where an air conditioner can be installed in an upper part of a roof thereof includes a roof structure having an opening, and a low roof main body having a recessed part provided in the opening, and recessed in a cross section, the air conditioner being able to be placed on the recessed part, and an edge part of the low roof main body which is continuously formed from the low roof main body and joined to the roof structure. The low roof main body and the edge part of the low roof main body are made of plastic.

鐵道車輛用轉向台車

一種鐵道車輛用轉向台車，其具備：台車框，其將承梁支承成能繞鉛垂軸相對迴轉；兩個輪軸，其具有車軸及一對車輪；以及轉向機構，其與承梁之相對迴轉相對應地使兩個輪軸中之至少一者轉向。轉向機構具有：轉向槓桿，其相對於台車框以支點軸線為中心旋動；連結連桿，其連結承梁與轉向槓桿，且和台車框與承梁之相對迴轉連動；以及轉向連桿，其連結於轉向槓桿，與轉向槓桿之旋動動作連動而使輪軸轉向；轉向連桿藉由銷構件連結於轉向槓桿，銷構件以不能相對旋動之方式固定於轉向槓桿。

Steering carts for railway vehicles

Field rotor of superconducting rotating machine

A field rotor of a superconducting rotating machine including: a rotation shaft; a supply shaft that supplies a refrigerant to the rotation shaft at one end of the rotation shaft; an input/output shaft provided at the other end of the rotation shaft so as to integrally rotate with the rotation shaft; and a superconducting coil held on a circumferential surface of the rotation shaft to be cooled by the refrigerant, wherein the supply shaft and the input/output shaft are fixed to each other so as to rotate integrally with each other, and the rotation shaft and the supply shaft are at least partly brought in contact with each other in order to allow the rotation shaft to be supported by the supply shaft and in order to be slidably fitted to each other in a circumferential direction of the rotation shaft and in an axial direction of the rotation shaft.