JP2010274685A5 - - Google Patents

Description

Low-floor rail car and low-floor rail car

The present invention is particularly relates to low-floor LRV (Light Rail Vehicle) suitable low-floor railway carriage and low-floor railway vehicle vehicle vehicle, particularly, left and right wheels provided in the truck is not connected with the axle The present invention relates to a low-floor railway vehicle carriage and a low-floor railway vehicle that are independent wheels and are optimal as a carriage used in an intermediate vehicle of a knitted vehicle having two wheels arranged in front and rear. In particular, a carriage and a railroad that can be applied to an intermediate vehicle having a structure in which a passenger room of the intermediate vehicle has a passage along the front-rear direction at an intermediate position in the vehicle width direction, and seats facing the front-rear direction on both sides of the passage It relates to vehicles .

  In the near future, a full-fledged aging society is about to come, and in response to people with mobility restrictions who have to use wheelchairs, etc., ultra low floor LRV vehicles have been developed in Europe. In 1997, a very low floor LRV vehicle made in Europe appeared in Kumamoto City. After that, the introduction or introduction plan of ultra-low floor LRV vehicles became active in various places. Against this background, with the call of the former Ministry of Construction (currently the Ministry of Land, Infrastructure, Transport and Tourism), with the aim of developing a Japanese-style ultra-low floor LRV that can respond to environmental improvements and barrier-free operation, "Union" is established, element development is carried out, and various carts are developed.

  In such a low-floor LRV vehicle carriage, the entrance / exit portion has an ultra-low floor so that even a person with mobility restrictions such as a wheelchair user can easily get on and off from a low platform for LRV without using a step, and movement in the vehicle is also possible. It is required that the floor height is extremely low, which can be achieved with a wheelchair. Therefore, the route from the entrance to the exit can be moved by a wheelchair, the floor height is very low and the wheelchair can pass through the passage part is allowed to be slightly inclined, but the minimum passage width is Need to be secured.

  For this purpose, the carriage frame of the carriage that supports the vehicle body is formed in a concave shape in front view, and the axle between the left and right wheels cannot be passed through in order to make the floor height extremely low, so that I have to be. Further, in order to keep the distance between the left and right wheels high in dimensional accuracy, it must have an axle beam structure for fixing the left and right independent wheels.

  By the way, in a conventional general air spring type bolsterless type railcar bogie 71, as shown in FIG. 8, for example, a shaft box 73 is disposed at a substantially central position of an axle 75, and a side beam 72 in the bogie frame is provided. The air springs 74 are usually provided one by one on the intermediate positions in the front-rear direction, and the vehicle body is placed on the air springs 74.

  Further, in the ultra low floor LRV vehicle, a coil spring is used as a pillow spring at the center position in the front-rear direction of the carriage in order to elastically support the vehicle body on the carriage. Therefore, the direction of the stool is a long seat facing the center of the vehicle body, and the passage is inevitably narrowed by the passenger's feet (see FIGS. 9 and 10 attached, FIGS. 1 and 6 of Patent Document 1). reference). That is, the carriage 81 sets the support height H of the vehicle body 84 shown in FIGS. 9 and 10 by the left and right coil springs 83 on the central portion of the side beam 82 to be close to the upper side of the wheel 85, and the floor surface of the vehicle body 84. Reference numeral 86 denotes a left and right high floor portion 86a supported by a coil spring 83, a low floor portion 86c that is set to a height substantially equal to or lower than the axle 85a between the left and right wheels 85, and left and right high floors from both left and right sides of the low floor portion 86c. Left and right rising portions 86d rising to the portion 86a. Further, the connecting portion 82d for connecting the side beams 82 of the carriage 81 passes the outer circumference of the floor surface 86 of the vehicle body substantially along the same, and the high floor portion 86a is a seat portion 87a, and the rising portion 86d is a kick portion 87b. A long sheet 87 is provided.

  Furthermore, as a prior art related to the ultra-low floor type LRV vehicle carriage, a fixed axle is formed by a shaft beam having a concave shape when viewed from the front, and independent wheels are rotatably supported on both sides of the fixed axle. The present application is an ultra-low-floor railway vehicle having a structure in which the fixed axle is a shaft-beam link member, and the base ends of both sides of the shaft-beam link are pivotally connected to each other in the center direction of the front bogie so that the fixed axle can rotate vertically. It has been proposed by a person (see Patent Document 2).

  In the ultra low floor railcar bogie according to Patent Document 2, the bogie frame has a concave shape when viewed from the front, and the horizontal beam connecting the beams on both sides is set to a low vertical position (height). Therefore, it is possible to realize a vehicle with an ultra low floor of 100%.

JP 2006-142987 A JP 2008-62680 A

  As described in the introduction, the present invention has an object to develop an ultra-low-floor railway vehicle carriage that can be applied to an intermediate vehicle having seats facing in the front-rear direction across a central passage in a cabin. It is said. However, the above-described conventional carriage and the power truck for an ultra-low floor type railway vehicle described in Patent Document 1 cannot solve the problem for the following reason.

  A coil spring as a pillow spring extends long into the passenger cabin at the center of both side beams constituting the main part of the carriage frame. For this reason, if the seats that face each other in the cabin of the intermediate vehicle are arranged in a long seat type on both side surfaces, it is difficult to secure a sufficiently wide passage through which a wheelchair or the like can pass. Also, when the seat is a long seat facing the sleeper, it seems that there is a sufficiently wide passage on the drawing, but the legs of the person sitting on the seat are obstructive as shown in FIG. Since the passage width is limited, it is substantially difficult to pass a wheelchair or the like.

The present invention has been made to solve the above-mentioned problems, and seats facing in the front-rear direction are arranged on both sides so as to sandwich the central passage, and the floor on which the passenger sits in the front-rear facing seats and lowers his feet is centered. It can be applied to intermediate vehicles with a passage and a series (meaning that there is no level difference or a slight level difference), and the structure as a trolley is simpler, smaller and lighter than conventional trolleys, and has a good ride comfort. It is an object of the present invention to provide a low-floor railway vehicle carriage and a low-floor railway vehicle having a floor surface of 100% low floor.

In order to solve the above problems, a cart for a low-floor railway vehicle according to claim 1 of the present invention has a front portion, an intermediate portion, and a rear portion with respect to the vehicle longitudinal direction, and the intermediate portion is A carriage frame having a pair of left and right side beams provided at positions lower than the front side portion and the rear side portion and a horizontal beam connecting the intermediate portions of the pair of side beams to each other; A pair of front and rear axle beams extending in the vehicle width direction at the rear, independent wheels rotatably supported on both left and right sides of the axle beam, the front and rear portions of the side beam, and the axle beam a primary suspension and a right and left side portions respectively elastic coupling, and a, a secondary suspension respectively provided on the upper surface of said front portion and said rear portion of said side beams, and wherein the That. In addition, the system for the primary suspension is not limited. For example, a system using a shaft box guard (shaft box guard type, pedestal type), a system using leaf springs (double plate spring type, single plate spring type, Minden type) ), Linkage system (parallel link type, shaft beam type, Alstom type), a system using rubber as a spring (conical laminated rubber type, shock absorbing rubber type, wing type, roll rubber type), a system guided by a cylindrical member ( Cylindrical guide type, Schlieren type) and the like can be used.

According to the low-floor railway vehicle bogie according to claim 1 having the configuration described above, 100% ultra low floor vehicle provided with a central passage of the ultra-low floor it can be realized. Further, since the side beam of the carriage is provided at a position where the middle part is lower than the front part and the rear part, it is possible to secure a floor surface that is continuous with the central passage and allows passengers facing in the front-rear direction to drop their feet. . In particular, the layout of the central passage in the cabin and the height and width of the stool located above the wheel of the carriage can be advantageously laid out without any restrictions, and the degree of freedom of design is expanded. Further, secondary suspensions can be arranged on the upper surfaces of the front and rear portions of the side beams, respectively, and the vehicle body can be supported by a plurality (for example, four or eight) of secondary suspensions . The load of the vehicle body is supported by the secondary suspension , but the load is transmitted to the primary suspension, the axle beam , and the wheels in order through the front and rear parts of the carriage, and the conventional side beam is centered. Unlike a carriage frame that supports the vehicle body with an air spring or the like that is arranged, a large bending moment does not act on the front side portion and the rear side portion of the side beam on which the wheel is located. In addition, in the case of a carriage that has an air spring or the like at the center in the longitudinal direction of the side beam, after the load of the vehicle body acts on the center of the side beam via the air spring or the like, the upper front portion of the side beam Since it is transmitted to the upper rear side portion and is transmitted in the order of the shaft spring-wheel, it is difficult to lower the rigidity of the central portion of the side beam and the portion connecting the central portion with the upper front side portion and the upper rear side portion. On the other hand, in the present invention, since the load of the vehicle body is hardly applied to the intermediate portion of the side beam, since a large bending moment does not act, the rigidity can be reduced and the weight can be reduced.

According to a second aspect of the present invention, at least a part of each of the secondary suspension, the side beam, the primary suspension, and the axle beam may be arranged so as to overlap each other in plan view. .
  As described in claim 3, the secondary suspension is provided in a pair of front and rear for each upper surface of the front part and the rear part of the side beam, and the pair of front and rear secondary suspensions are: It can be set as the structure arrange | positioned so that the virtual vertical line which passes along the rotation center of the said independent wheel may be pinched | interposed by side view.
  5. The secondary suspension according to claim 4, wherein the secondary suspension has an air spring main body, an outer cylinder having a reverse concave shape with a lower end open and covering the air spring main body, the air spring main body and the outer cylinder. A diaphragm-type air spring provided with an annular diaphragm connecting the air spring main body and the outer cylinder so as to form an internal space therebetween.

In this way, since the secondary suspension (diaphragm type air spring) can have a load characteristic in the horizontal direction corresponding to the amount of horizontal displacement with respect to the horizontal displacement between the vehicle body and the carriage, the vehicle body Since it is possible to give a restoring force to the secondary suspension while allowing horizontal displacement between the vehicle and the carriage, it is possible to prevent generation of high lateral pressure between the wheels / rails.

Further, by providing the secondary suspension in pairs before and after on the front portion and rear portion of the side beams, the secondary suspension on the front portion and rear portion of the side beam passes through the rotation center of the independent wheel Since it is arranged so that the virtual vertical line is sandwiched in side view, an unnecessary bending moment does not act.

Furthermore, while the maximum pressure exerted on the secondary suspension (diaphragm type air springs) not more than a predetermined value, it is possible to miniaturize and reduce the diameter of the secondary suspension to the passage of the rooms central portion, of the secondary suspension The amount of protrusion can be minimized.

The invention of claim 5 is a low-floor railway vehicle in which a vehicle body is supported by a carriage, and the carriage has a front portion, an intermediate portion, and a rear portion with respect to the longitudinal direction of the vehicle, and the intermediate portion A cart with a concave shape when viewed from the front, having a pair of left and right side beams provided at positions lower than the front and rear portions, and a horizontal beam connecting the intermediate portions of the pair of side beams. A pair of front and rear axle beams extending in the vehicle width direction at the front and rear of the lateral beam, independent wheels rotatably supported on both left and right sides of the axle beam, the front portion of the side beam and the A primary suspension that elastically couples the rear portion and the left and right side portions of the axle beam; and a secondary suspension that is provided on the upper surface of the front portion and the rear portion of the side beam, and The body includes a high floor portion supported by the secondary suspension from below, a first low floor portion extending forward and backward at a vehicle width direction center between the pair of side beams, and a bottom portion of the intermediate portion of the side beam. And a second low floor portion provided above .

Thus, since the width of the passage way is possible, such as wheelchair in the passenger compartment of the vehicle between the middle can be secured, 100% ultra low with ultra low floor central passageway even when used as an intermediate dolly A floor LRV vehicle can be realized.

The passage of a cabin of the vehicle body is provided on the upper surfaces of the first low floor portion and the second low floor portion, and the second low floor is disposed on the upper surface of the high floor portion. It can be set as the structure where the front and back facing seat which faces front and back so that a part may be pinched | interposed is provided .

In this way, even when the room structure in which the front and rear facing seat facing the direction before and after sandwiching the ultra low floor of the passage, since the passenger confronts sitting on the seat can secure a space for placing the feet, passage The wheelchair etc. will not be prevented from passing. In addition, the floor where the passenger puts his / her foot and the passage can be provided continuously in a series of steps by eliminating the steps or by providing only a few steps.

As described above, the super-low-floor railway vehicle carriage and the low-floor railway vehicle according to the present invention have the following excellent effects.

· 100% A vehicle having a floor surface of the ultra-low floor, to place the seat facing the front and rear direction on both sides so as to sandwich the passage, passage floor surface down the legs sitting on the seat facing the passenger of the front and rear It can be applied to a bogie for intermediate vehicles in a series.

-The width of the aisle in the cabin and the height and width of the stool located above the wheel of the carriage can be laid out advantageously without restrictions, and the degree of freedom of design is expanded.

・ A pair of front and rear secondary suspensions ( diaphragm-type air springs ) are equally distributed around the axle so that a virtual vertical line passing through the center of rotation of the independent wheel is sandwiched between the front part and rear part of the side beam in side view. The vehicle body load is transmitted to the primary suspension - axle beam -wheel sequentially through the front and rear parts of the carriage frame, and the conventional side beam is not applied. Unlike a carriage frame that supports the vehicle body with an air spring or the like at the center, a large bending moment does not act on the front and rear portions of the side beam where the wheels are located. Furthermore, in the present invention, since the load of the vehicle body is hardly applied to the middle part of the side beam, since a large bending moment does not act, the rigidity can be reduced and the weight can be reduced. Therefore, the structure as the carriage is compared with the conventional carriage. Can be simplified, can be reduced in size and weight, and ride comfort is improved.

It is a side view which shows the trolley | bogie for an ultra-low floor type railway vehicle which concerns on the Example of this invention. It is a top view of the trolley | bogie of FIG. FIG. 3 is a sectional view taken along line B-B in FIG. 2. It is an AA line side view of FIG. FIG. 5A is a cross-sectional view of a special diaphragm type air spring, and FIG. 5B is a diagram showing a horizontal displacement and a load characteristic in the horizontal direction. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view longitudinal sectional view showing a three-car train ultra-low floor type tram equipped with a carriage (FIG. 1) according to an embodiment of the present invention in an intermediate vehicle. FIG. 7 is a floor layout diagram of the ultra-low floor tram shown in FIG. 6. It is a side view which shows the conventional railcar bogie. It is sectional drawing which shows the railroad vehicle made into the low floor and long seat provided with another conventional bogie for rail vehicles. FIG. 10A is a side view of the central railway vehicle shown in FIG. 9, and FIG. 10B is a plan view thereof.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the ultra-low floor railcar carriage according to the present invention will be described below with reference to the drawings.

  The ultra-low floor railcar bogie 1 according to the first embodiment of the present invention is a non-drive bogie, and in this example, is used as a bogie for the intermediate vehicle 52 of the ultra-low floor tram 51 shown in FIG. As shown in FIG. 7, in the passenger compartment of the intermediate vehicle 52, a central passage 53 is provided continuously in the front-rear direction at the center in the vehicle width direction, and faces the front-rear direction on both the left and right sides so as to sandwich the central passage 53. A seat 54 is disposed, and a floor surface 55 on which a passenger sits on the front and rear facing seats 54 and lowers his / her feet is continuously provided in series with the central passage 53 without a step (or by providing a slight step).

  As shown in FIG. 1 or FIG. 2, the ultra low floor tram 51 of this example has a cab D at the front and rear ends of the first and third vehicles 56, and the center side from the cab D is 100%. In the cabin P with a very low floor, the cab D is slightly higher than the cabin P. In the cabin P of each of the first and third vehicles 56, the seat 58 is arranged facing the vehicle width direction, and the floor surface under the seat 58 and the floor surface of the central passage 57 are both extremely low floor surfaces. . Further, an entrance / exit 59 is provided adjacent to the seat 58 of each vehicle 56 before and after the ultra-low floor tram 51, and the floor surface of the entrance / exit 59 is also the same ultra-low floor surface as the central passage 57. That is, the ultra-low floor tram 51 is a 100% ultra-low floor vehicle except for the cab D. In FIG. 6, reference numeral 60 is a pantograph, and reference numeral 61 is a drive carriage.

  On the other hand, as shown in FIGS. 3 and 4, the carriage 1 includes a carriage frame 2 that is concave when viewed from the front. As shown in FIG. 1, the carriage frame 2 has a pair of left and right side beams 3 and 3 in which a portion (center portion) 3a at an intermediate position in the front-rear direction (rail direction) is formed in a concave shape when viewed from the side. . Each side beam 3 rises upward from the bottom (lower part) 3b of the concave central part 3a to the upper front part and the upper rear part, and then extends horizontally to form the upper front part 3c and the upper rear part 3c. is doing. As shown in FIG. 2, the left and right side beams 3 and 3 are integrally connected by a horizontal beam 3d between the bottom portions (lower portions) 3b and 3b of the central portion 3a. As shown in FIGS. 1 and 2, the axle beams 4 and 4 are arranged at the same height as the horizontal beam 3d and in parallel with the horizontal beam 3d with the horizontal beam 3d interposed therebetween. Fixed axle support portions 5 are integrally provided on both sides of each axle beam 4.

A support hole 5a of the fixed axle 6 is formed on the outer surface side of the left and right fixed axle support portions 5, and the fixed axle 6 is press-fitted into the support hole 5a. Further, in the press-fitted state, as shown in FIG. 3 , the bolt 7 is inserted through the through hole 5b which is formed on the inner surface side of the fixed axle support portion 5 and is located at the center of the support hole 5a. The fixed axle 6 is fixed to the fixed axle support portion 5 by screwing and tightening a bolt 7 (the screw portion thereof) into a screw hole 6a drilled in the center of the end face of the shaft. On the other hand, the wheel 8 is rotatably supported via a bearing 9 with respect to the tip end portion of the fixed axle 6 fixed to the fixed axle support portion 5. An inner ring side 9 a of the bearing 9 is fixed around the fixed axle 6, and an outer ring side 9 b of the bearing 9 rotates integrally with the wheel 8 with respect to the fixed axle 6 and the inner ring side bearing 9 a.

The left and right fixed axle support portions 5 are connected to the upper front portion 3c or the upper rear portion 3c of the side beam 3 of the carriage frame 2 via the guide mechanism 11 so as to be displaced (up and down) in the vertical direction. Then, shaft springs 12 and 12 as primary suspensions are respectively provided between the lower surfaces of the upper front portion 3c and the upper rear portion 3c of the side beam 3 and both side (front and rear) portions of the support hole 5a of the fixed axle support portion 5. Is being disguised. With this configuration, the carriage frame 2 of the carriage 1 is supported by the four wheels 8 so as to be movable up and down via a pair of front and rear shaft springs 12 (shaft box support devices). The shaft spring 12 is a coil spring, a Jericho spring, a rubber spring, or the like.

A vehicle body 52a of the intermediate vehicle 52 shown in FIG. 6 is placed on the carriage 1 via eight diaphragm air springs 15 ( secondary suspensions ). Each air spring 15 is formed in a cylindrical shape in this embodiment, and two air springs 15 (a pair of front and rear) are sandwiched around the axle 6 of the wheel 8 on the upper front portion 3c and the upper rear portion 3c of the side beam 3. ) Are arranged one by one. In the present embodiment, the shape and the number of the air springs 15 are cylindrical and eight because of the relationship between the location of the air spring 15 on the side beam 3 and the capacity of the air spring necessary for supporting the vehicle body 52a. The shape of the air spring 15 and the number to be installed are not limited. For example, the shape of the diaphragm-type air spring 15 can be an elliptical cylindrical body as viewed from above, and one each can be installed in the upper front portion 3c and the upper rear portion 3c, for a total of four. In this example, a total of eight diaphragm-type air springs 15 are provided at each installation location, front and rear, but in order to minimize the amount of air spring 15 that protrudes inward from the side beam 2 of the carriage 1. is there. This is to increase the effective passage width and the effective seating dimension in the vehicle body 52a as much as possible.
By the way, when the vehicle body load is constant, the internal pressure can be reduced as the total area of the air spring 15 increases. In other words, if the internal pressure is increased, the inner diameter of the air spring 15 can be reduced. However, in order to prevent air leakage in the air spring in relation to the sealing mechanism, there is an upper limit of the internal pressure, so The inner diameter was reduced by increasing the number to eight, four times the normal number. As described below, a special diaphragm air spring having a known structure is used for the air spring 15. In this embodiment, as shown in FIG. 5 (a), a metal body having a cylindrical shape whose height is half or less than the outer diameter, the central portion of the upper surface protruding upward in an arc shape, and the lower end is opened. The outer cylinder 16 and a metal inner cylinder 17 (air spring body) having a smaller diameter than the outer cylinder 16, and the diaphragm 18 is formed by the periphery of the top surface of the inner cylinder 17 and the inner peripheral surface of the outer cylinder 16. Connected with. An orifice 20 is provided at the center of the top surface of the inner cylinder 17, and an air introduction hole 21 is provided at the center of the lower surface of the inner cylinder 17. Reference numeral 22 in the figure is a stopper. That is, in this embodiment, a diaphragm-type air spring having a substantially cylindrical shape whose height is half or less than the outer diameter and high rigidity in the front-rear and left-right directions is used for the air spring 15. Among diaphragm air springs, a special diaphragm air spring is particularly desirable. In this special diaphragm type air spring, the inner cylinder 17 and the outer cylinder 16 move relatively with respect to the displacement in the horizontal direction, and the lateral area is different around the cylinder. For this reason, a restoring force is generated due to the difference, and as shown in FIG. 5B, a linear load deflection characteristic is obtained with respect to the amount of displacement in the horizontal direction. It is a highly rigid air spring having a structure that generates a relatively large load in the direction. A clamp diaphragm type air spring having the same characteristics as the special diaphragm type air spring can also be used.
In this example, as described above, the eight air springs 15 are fixed on the upper front part 3c and the upper rear part 3c of the side beam 3 so as to sandwich the fixed axle 6, respectively, and the vehicle body 52a is placed on the air spring 15. In the mounted state, the vehicle body 52a is supported by the air spring 15 so as to be displaceable in the vertical direction. Further, the air spring 15 acts to suppress the displacement of the vehicle body 52a with respect to the carriage frame 2 in the horizontal direction, and allows the vehicle body 52a to be displaced in the horizontal direction.

  As shown in FIG. 1, a tread brake device 25 is provided symmetrically on the bottom 3b of the central portion 3a of the side beam 3 with the center line interposed therebetween. Each tread brake device 25 includes a control 26, and each control 26 is arranged toward the tread of the corresponding wheel 8. Further, as shown in FIG. 2 and FIG. 3, rectangular support members 27 protrude from the center line position of the bottom portion 3b of the central portion 3a toward both sides and are fixedly provided. And the vehicle body 52a is connected to the front-end | tip part of each support member 27 through the traction device 28 so that the vertical movement of the vehicle body 52a is permitted. That is, the carriage 1 and the vehicle body 52a placed thereon are connected by a pair of left and right traction devices 28 and 28, and are opposed to the intermediate portion in the vehicle width direction on the front side of the horizontal beam 4 of the carriage 1. The lateral displacement of the vehicle body 52a is suppressed by the stoppers 29 and 29 arranged in this manner. For this reason, the support piece 30 protrudes downward from the bottom of the vehicle body 52a toward the stoppers 29 and 29.

  As described above, the cart 1 according to the present embodiment is configured, and the vehicle body 52a is supported on the cart 1 to complete the intermediate vehicle 52. Further, in this example, the vehicles 56 are respectively connected to the front and rear of the intermediate vehicle 52 so as to form a three-car train ultra-low floor tram 51. It should be noted that the number of trains in the ultra-low floor tram is not limited. For example, in the case of a 5-car train or a 7-car train, two or more intermediate vehicles 52 are connected.

  Although the embodiment has been described above for the low-floor type railway vehicle carriage according to the present invention, it can be implemented as follows.

In the above embodiment, the fixed axle 6 that supports each wheel 8 provided in the carriage 1 is fixed to the fixed axle support portion 5, and the wheel 8 is rotated with respect to the fixed axle 6 via the bearing 9. However, the wheel can be attached to the axle so as to be integrally rotatable, and the axle can be rotatably supported by the axle box.

In the above embodiment, the vehicle body 52 a is supported on the carriage 1 via the air spring 15, but a coil spring, rubber spring, or leaf spring having a low overall height can be used instead of the air spring 15. Although the number of the air springs 15 is eight, it can be further increased to twelve or reduced to four.

In the above embodiment, the intermediate vehicle 52 bogie 1 is a non-driving bogie, but it can be made a driving bogie by equipping it with a drive device such as a motor so as not to hinder ultra-low flooring. For example, a motor or gear device is arranged on the vehicle body side so that the driving force is transmitted to the wheel 8 on the cart 1 side by a transmission device, or a small double-axis motor is arranged on the outer side surface of the cart 1 to form a bevel gear device. The front and rear wheels 8 can be driven via In addition, a motor (in-wheel motor) can be incorporated in the center of the wheel 8 to drive the wheel 8 directly.

  The cart for an ultra-low-floor type railway vehicle according to the present invention can be used as a bogie for a subway and other railway vehicles in addition to an intermediate cart of an ultra-low-floor type LRV vehicle.

1 bogie 2 bogie frame 3 side beam 3a concave central part 3b bottom part 3c upper front part or upper rear part 3d lateral beam 4 axle beam 5 fixed axle support part 5a support hole 5b through hole 6 fixed axle 6a screw hole 7 bolt 8 Wheel 9 Bearing 9a Inner ring side bearing 9b Outer ring side bearing 11 Guide mechanism 12 Shaft spring (shaft box support device)
15 Special diaphragm type air spring (body support device)
15a Air chamber 15c Pressurized air introduction hole 16 Outer cylinder 17 Inner cylinder 18 Diaphragm 19 Outer cylinder rubber 20 Orifice 21 Air introduction hole 22 Stopper 25 Tread brake device 26 Control wheel 27 Support member 28 Pulling device 29 Stopper 30 Support piece 51 Low-floor type tram 52 Intermediate vehicle 52a Car body 53 Central passage 54 Seat 55 Floor

Claims (6)

  A pair of left and right side beams each having a front portion, an intermediate portion, and a rear portion with respect to the longitudinal direction of the vehicle, wherein the intermediate portion is provided at a position lower than the front portion and the rear portion; A carriage frame having lateral beams connecting the intermediate portions of the side beams to each other;
  A pair of front and rear axle beams extending in the vehicle width direction at the front and rear of the horizontal beam,
  An independent wheel rotatably supported on each of the left and right sides of the axle beam;
  A primary suspension that elastically couples the front and rear portions of the side beam and the left and right sides of the axle beam;
  A bogie for a low-floor railway vehicle, comprising: secondary suspensions respectively provided on the upper surfaces of the front portion and the rear portion of the side beam. The bogie for a low-floor railway vehicle according to claim 1, wherein at least a part of each of the secondary suspension, the side beam, the primary suspension, and the axle beam is arranged to overlap each other in plan view. The secondary suspension is provided in a pair of front and rear for each upper surface of the front part and the rear part of the side beam,
  2. The low-floor railway vehicle carriage according to claim 1, wherein the pair of front and rear secondary suspensions are disposed so as to sandwich a virtual vertical line passing through a rotation center of the independent wheel in a side view. The secondary suspension forms an internal space between the air spring body, the outer cylinder having an inverted concave shape with an open lower end and covering the upper part of the air spring body, and the air spring body and the outer cylinder. The low-floor railway vehicle carriage according to claim 1, wherein the carriage is a diaphragm-type air spring including an annular diaphragm connecting the air spring main body and the outer cylinder. A low-floor railway vehicle with a body supported by a carriage,
The cart is
    A pair of left and right side beams having a front part, an intermediate part, and a rear part with respect to the longitudinal direction of the vehicle, wherein the intermediate part is provided at a position lower than the front part and the rear part; and the pair of sides A trolley frame having a concave shape in front view having lateral beams connecting the intermediate portions of the beams to each other;
    A pair of front and rear axle beams extending in the vehicle width direction at the front and rear of the horizontal beam,
    An independent wheel rotatably supported on each of the left and right sides of the axle beam;
    A primary suspension that elastically couples the front and rear portions of the side beam and the left and right sides of the axle beam;
    Secondary suspensions respectively provided on the upper surfaces of the front part and the rear part of the side beam,
  The vehicle body is
    A raised floor supported from below by the secondary suspension;
    A first low floor portion extending back and forth at the center in the vehicle width direction between the pair of side beams;
    A low-floor railway vehicle, comprising: a second low floor portion provided above a bottom portion of the intermediate portion of the side beam. On the upper surfaces of the first low floor portion and the second low floor portion, a passage of a passenger compartment of the vehicle body is provided,
  The low-floor railway vehicle according to claim 5, wherein a front-rear facing seat is provided on the upper surface of the high floor portion so as to face the front and rear so as to sandwich the second low floor portion.