HK1159571B - Low floor vehicle - Google Patents

Description

Low floor vehicle

Technical Field

The present invention relates to low floor vehicles that travel on rails.

Background

In recent years, trams and the like have adopted a low floor vehicle design in which a floor surface of the vehicle is set close to a road surface to reduce a height difference of passengers getting on and off the vehicle to realize a barrier-free vehicle. In such a tram, due to restrictions such as road traffic conditions, a large number of curved tracks curved with a radius of curvature of 20m or less are provided. A low floor vehicle having a low center of gravity due to its structure can run relatively stably on such a curved track. However, there is a problem in that, when the vehicle enters a curved track, an angle of a running direction of the wheel with respect to a tangential direction of the curved track (hereinafter referred to as "attack angle") increases. When the angle of attack is large, in the wheel located on the outer rail during running on a curved track, the flange of the wheel comes into contact with the track in some cases. At this time, pressure is applied to the vehicle from the wheel flange, the lateral pressure of the vehicle increases, and vibration and creaking sounds occur in the vehicle. Therefore, there are problems that the riding comfort of the passenger is lowered and the wheel flange is worn.

In view of such a problem, a low floor vehicle called LRV (light rail vehicle) as disclosed in patent document 1 has been developed. In fig. 7, an example of the configuration of the LRV is shown. The direction of operation of the LRV is shown by arrow a. In the description, it is assumed that the running direction is toward the front of the vehicle. Referring to fig. 7, the LRV includes two front vehicles 102 and one intermediate vehicle 103 running on a track 101. As a vehicle configuration, one intermediate vehicle 103 is disposed between two front vehicles 102.

In the connecting portion 104 between the front vehicles 102 and the intermediate vehicle 103, pin connectors 105 are arranged along an axis extending in the vehicle vertical direction. The front vehicles 102 are coupled to the intermediate vehicle 103 so as to be able to rotate about the pin connectors 105. Thus, the front vehicles 102 and the intermediate vehicles 103 can be bent around the pin connectors 105 to correspond to the curvature radius R of the curved track 101. Further, in the connecting portion 104, a damper, a spring, or the like (not shown) is provided to suppress rotation of the front vehicle 102 and ensure safety during high-speed running of the vehicle.

A bogie 107 is disposed under the vehicle body 106 of the front vehicle 102. As shown in fig. 8 to 10, a pair of wheels 108 are provided on each of the vehicle front side and the vehicle rear side of the bogie 107. The pair of wheels 108 are configured to be pivotable independently of each other about the same axis 108a extending in the vehicle transverse direction, and are linked by a journal member (joural member) 109. The journal members 109 are disposed in the vehicle front and vehicle rear of each bogie frame 110 formed as a frame member of the bogie 107. A conical rubber 111 is provided between the journal member 109 and the bogie frame 110 as a shaft spring of the wheel 108. The vibration transmitted from the wheel 108 to the bogie frame 110 is suppressed by the conical rubber 111. Further, a journal member 109 extends between the pair of wheels 108 at a position close to the road surface. A floor surface (not shown) in the vehicle is disposed on the journal member 109. Therefore, the floor surface in the vehicle is configured to be close to the road surface.

Referring again to fig. 7, when the vehicle traveling in the traveling direction enters the curved track 101, a force toward the straight direction generated by inertia acts on the vehicle body 106. A force directed in a direction to bend along the curved track 101 acts on the carriage 107. Therefore, the forces acting on the entire front vehicles 102 are unbalanced. At this time, the straight-ahead force generated by inertia also affects the carriage 107. The trolley 107 is not easily bent along the curved track 101. Thus, the angle of attack α, which is the angle of the direction of travel of the wheel 108 (shown by arrow C) relative to the tangential direction of the curvilinear track (shown by arrow B), increases. The wheel flange 108b (shown in fig. 8-10) of the wheel 108 on the outer rail side may come into contact with the rail. At the time of this contact, pressure is applied from the wheel flange 108b to the vehicle, the lateral pressure of the vehicle increases, and vibration and creaking sounds occur in the vehicle. Therefore, there are problems that the riding comfort of the passenger is lowered and the wheel flange 108b is worn.

To absorb such imbalance of the force, the bogie 107 is configured to be movable in the vehicle lateral direction with respect to the vehicle body 106. Specifically, as shown in fig. 8 to 10, a traction rod 112 that transmits the traction force of the bogie 107 to the vehicle body 106 is arranged in the vehicle longitudinal direction. An end 112a of the drawbar 112 located at the rear of the vehicle is attached to the dolly 107 via a spherical bush or a vibration-proof rubber (not shown). An end 112b of the drawbar 112 located in front of the vehicle is mounted to the vehicle body 106 via a spherical bush or a vibration-proof rubber (not shown).

Reference list

Patent document

Patent document 1: japanese patent laid-open No.2008-132828

Disclosure of Invention

Technical problem

However, in the vehicle of patent document 1, as shown in fig. 7, during the vehicle running on a curved track, the front vehicles 102 and the intermediate vehicles 103 are about to bend around the pin connectors 105 to correspond to the radius of curvature R of the curved track 101. However, in some cases, the front vehicles 102 cannot sufficiently bend with respect to the intermediate vehicle 103 due to the influence of the shock absorber of the connecting portion 104. In some cases, the wheels 108 do not bend along the curved track due to being affected by the elevation (can) or the track pitch (slack) of the curved track, and so on. In this case, the direction of travel of the wheel 108 (shown by arrow B) may not face the tangential direction of the curved track 101 (shown by arrow C), and the angle of attack α increases. Therefore, pressure is still applied to the vehicle from the wheel flange 108b, the lateral pressure of the vehicle increases, and vibration and creaking sounds occur in the vehicle. Therefore, there are problems that the riding comfort of the passenger is lowered and the wheel flange 108b is worn.

Another problem is that since the difference between the forces acting on the vehicle body 106 and the trolley 107 is absorbed when the vehicle enters the curved track, it is possible that even if the trolley 107 moves in the vehicle lateral direction with respect to the vehicle body 106, the straight-ahead force generated by inertia is large, and the imbalance of the force cannot be completely absorbed. In this case, the carriage 107 is still affected by the straight-ahead force generated by inertia. In some cases, the angle of attack α increases. Therefore, pressure is still applied to the vehicle from the wheel flange 108b, the lateral pressure of the vehicle increases, and vibration and creaking sounds occur in the vehicle. Therefore, there are problems that the riding comfort of the passenger is lowered and the wheel flange 108b is worn.

The present invention has been devised in view of the above circumstances, and it is an object of the present invention to provide a low floor vehicle capable of reducing a lateral pressure of the vehicle when the vehicle enters a curved track, preventing the vehicle from vibrating and squeaking, improving a riding comfort of passengers, and reducing wear of a wheel flange.

Means for solving the problems

In order to solve the above problems, a low floor vehicle of the present invention is a low floor vehicle including: a trolley arranged under the trolley body; a carriage frame configured as a frame member of the carriage; a pair of bogie frame cross members arranged in a vehicle transverse direction at a middle of the bogie frame in a vehicle longitudinal direction and arranged to be spaced apart from each other in the vehicle longitudinal direction; and a pair of wheels provided on a vehicle front side and a vehicle rear side, respectively, with respect to a pair of bogie frame cross members of the bogie frame and configured to run on a track, wherein a pair of flexible traction rods arranged in a vehicle longitudinal direction and configured to be capable of expanding and contracting in the vehicle longitudinal direction are provided in the bogie frame, the pair of flexible traction rods being arranged to be spaced apart from each other in a vehicle lateral direction, one end of the flexible traction rod being mounted to the bogie frame cross member, and the other end of the flexible traction rod being mounted to a receiving portion provided in a vehicle body; and the dolly is configured to be rotatable relative to the vehicle body.

Further, in order to solve the above-mentioned problems, a low floor vehicle of the present invention is a low floor vehicle including: a trolley arranged under the trolley body; a carriage frame configured as a frame member of the carriage; a pair of bogie frame cross members arranged in a vehicle transverse direction at a middle of the bogie frame in a vehicle longitudinal direction and arranged to be spaced apart from each other in the vehicle longitudinal direction; and a pair of wheels provided on a vehicle front side and a vehicle rear side, respectively, with respect to a pair of bogie frame cross members of the bogie frame and configured to run on a track, wherein a traction rod is provided in the bogie frame, the traction rod being arranged in a vehicle longitudinal direction at a center in a vehicle transverse direction, one end of the traction rod being attached to the bogie frame cross member, and the other end of the traction rod being attached to a receiving portion provided in a vehicle body; a restoring rod disposed in a vehicle longitudinal direction and configured to be expandable and contractible in the vehicle longitudinal direction, one end of the restoring rod being mounted to the bogie frame cross member, and the other end of the restoring rod being mounted to a receiving portion provided in a vehicle body, at least one of left and right outer sides of the drawbar in the vehicle transverse direction; and the dolly is configured to be rotatable relative to the vehicle body.

In the low-floor vehicle of the invention, rotation suppressing dampers, which are arranged in the vehicle lateral direction and configured to be able to absorb an acting force in the vehicle lateral direction, are provided respectively at a front side portion of the bogie frame cross member located on the vehicle front side and a rear side portion of the bogie frame cross member located on the vehicle rear side, one end of the rotation suppressing damper being mounted to the bogie frame cross member and the other end of the rotation suppressing damper being mounted to a receiving portion provided in the vehicle body; and a stopper provided in the vehicle body and a stopper member provided in the dolly are configured to be able to come into contact with each other to regulate rotation of the vehicle body.

The invention has the advantages of

According to the present invention, the following effects can be obtained. The low floor vehicle of the present invention is a low floor vehicle including: a trolley arranged under the trolley body; a carriage frame configured as a frame member of the carriage; a pair of bogie frame cross members arranged in a vehicle transverse direction at a middle of the bogie frame in a vehicle longitudinal direction and arranged to be spaced apart from each other in the vehicle longitudinal direction; and a pair of wheels provided on a vehicle front side and a vehicle rear side, respectively, with respect to a pair of bogie frame cross members of the bogie frame and configured to run on a track, wherein a pair of flexible traction rods arranged in a vehicle longitudinal direction and configured to be capable of expanding and contracting in the vehicle longitudinal direction are provided in the bogie frame, the pair of flexible traction rods being arranged to be spaced apart from each other in a vehicle lateral direction, one end of the flexible traction rod being mounted to the bogie frame cross member, and the other end of the flexible traction rod being mounted to a receiving portion provided in a vehicle body; and the dolly is configured to be rotatable relative to the vehicle body.

Therefore, when the vehicle enters a curved track, if the wheel on the outer rail side of the pair of wheels comes into contact with the track so that a force toward the vehicle transverse direction inner side is applied to the wheel on the outer rail side, the bogie receives a force that rotates relative to the vehicle body. At this time, one of the pair of flexible traction rods is extended, and the other of the pair of flexible traction rods is contracted, thereby enabling the bogie to rotate relative to the vehicle body. The force in the straight-ahead direction generated by the inertia of the vehicle body is absorbed by this rotation of the bogie, so that the bogie is less likely to be affected. The trolley is easily bent along a curved track. Therefore, the wheels become a state of following the curved track more closely, and the vehicle can enter the curved track at a small angle of attack. Therefore, when the vehicle enters the curved track, the contact pressure between the wheel on the outer rail side and the track is relaxed, the side pressure applied to the vehicle is reduced, and the vehicle is prevented from vibrating and creaking. Therefore, the riding comfort of the passenger is improved, and the wear of the wheel flange is reduced. In other words, the vehicle can smoothly pass through the curved track.

The low floor vehicle of the present invention is a low floor vehicle including: a trolley arranged under the trolley body; a carriage frame configured as a frame member of the carriage; a pair of bogie frame cross members arranged in a vehicle transverse direction at a middle of the bogie frame in a vehicle longitudinal direction and arranged to be spaced apart from each other in the vehicle longitudinal direction; and a pair of wheels provided on a vehicle front side and a vehicle rear side, respectively, with respect to a pair of bogie frame cross members of the bogie frame and configured to run on a track, wherein a traction rod is provided in the bogie frame, the traction rod being arranged in a vehicle longitudinal direction at a center in a vehicle transverse direction, one end of the traction rod being attached to the bogie frame cross member, and the other end of the traction rod being attached to a receiving portion provided in a vehicle body; a restoring rod disposed in a vehicle longitudinal direction and configured to be expandable and contractible in the vehicle longitudinal direction, one end of the restoring rod being mounted to the bogie frame cross member, and the other end of the restoring rod being mounted to a receiving portion provided in a vehicle body, at least one of left and right outer sides of the drawbar in the vehicle transverse direction; and the dolly is configured to be rotatable relative to the vehicle body.

Therefore, when the vehicle enters a curved track, if the wheel on the outer rail side of the pair of wheels comes into contact with the track so that a force toward the vehicle transverse direction inner side is applied to the wheel on the outer rail side, the bogie receives a force that rotates relative to the vehicle body. At this time, one of the pair of restoring rods is extended and the other of the pair of restoring rods is contracted, thereby enabling the bogie to rotate around the traction rod with respect to the vehicle body. The force in the straight-ahead direction generated by the inertia of the vehicle body is absorbed by this rotation of the bogie, so that the bogie is less likely to be affected. The trolley is easily bent along a curved track. Therefore, the wheel becomes a state further along the curved track, and can enter the curved track at a small angle of attack. Therefore, when the vehicle enters the curved track, the contact pressure between the wheel on the outer rail side and the track is relaxed, the side pressure applied to the vehicle is reduced, and the vehicle is prevented from vibrating and creaking. Therefore, the riding comfort of the passenger is improved, and the wear of the wheel flange is reduced. In other words, the vehicle can smoothly pass through the curved track.

In the low-floor vehicle of the invention, rotation suppressing dampers, which are arranged in the vehicle lateral direction and configured to be able to absorb an acting force in the vehicle lateral direction, are provided respectively at a front side portion of the bogie frame cross member located on the vehicle front side and a rear side portion of the bogie frame cross member located on the vehicle rear side, one end of the rotation suppressing damper being mounted to the bogie frame cross member and the other end of the rotation suppressing damper being mounted to a receiving portion provided in the vehicle body; and a stopper provided in the vehicle body and a stopper member provided in the dolly are configured to be able to come into contact with each other to regulate rotation of the vehicle body. When the vehicle enters the curved track as described above, in addition to the force acting on the bogie from the track, when the vehicle receives an external force from the vehicle lateral direction, such external force is absorbed by the rotation suppressing dampers provided on the vehicle front side and the vehicle rear side. The bogie can be prevented from rotating relative to the vehicle body by a force other than a force acting on the bogie from the rail. Therefore, the bogie does not rotate relative to the vehicle body during the linear track running of the vehicle, etc., ensuring the running stability of the vehicle. Since the amount of movement of the carriage in the vehicle lateral direction is restricted by the stopper member, the carriage is prevented from large rotation, further ensuring the running stability of the vehicle. Therefore, the above-described effects can be more reliably obtained while ensuring the running stability of the vehicle.

Drawings

Fig. 1 is an explanatory view showing a low-floor vehicle during running along a straight track in the first embodiment of the invention.

Fig. 2 is a plan view showing a bogie of the vehicle in the first embodiment of the invention.

Fig. 3 is a front view showing a bogie of the vehicle in the first embodiment of the invention.

Fig. 4(a) is a longitudinal sectional view showing a schematic structure of a spring-type flexible traction rod in a vehicle according to a first embodiment of the present invention. Fig. 4(b) is a longitudinal sectional view showing a schematic structure of the rubber-type flexible traction rod.

Fig. 5 is an explanatory view showing a low-floor vehicle during running along a curved track in the first embodiment of the invention.

Fig. 6 is a plan view showing a bogie of the vehicle in the second embodiment of the invention.

Fig. 7 is an explanatory view showing a conventional low-floor vehicle during curved track running.

Fig. 8 is a plan view showing a dolly of a conventional vehicle.

Fig. 9 is a side view showing a dolly of a conventional vehicle.

Fig. 10 is a front view showing a dolly of a conventional vehicle.

Detailed Description

First embodiment

A low floor vehicle (hereinafter referred to as "vehicle") according to a first embodiment of the invention is explained below. In the first embodiment, a vehicle is explained using an LRV as shown in fig. 1 as an example of the vehicle. In the description, it is assumed that the running direction of the vehicle is the vehicle front. Fig. 1 is a view of a vehicle as viewed from above. The direction of travel of the vehicle is shown by arrow a. The vehicle shown in fig. 1 comprises two front vehicles 2 and one intermediate vehicle 3 running on a track 1. As a vehicle configuration, the one intermediate vehicle 3 is disposed between the two front vehicles 2. A connecting portion 4 is provided between the front vehicles 2 and the intermediate vehicle 3. A pin connector 5 is provided in the connecting portion 4 along an axis extending in the vehicle up-down direction. The front vehicles 2 are rotatably coupled to the intermediate vehicle 3 about the pin connectors 5. A bogie 7 is provided under the vehicle body 6 of the front vehicle 2. Wheels 8 provided in the bogie 7 are configured to run on the track 1.

The structure of the carriage 7 will be described with reference to the carriage 7 in a state during the straight running shown in fig. 2 and 3. The direction of travel of the vehicle is shown by arrow a. The carriage 7 is provided with a carriage frame 9 as a frame member of the carriage 7. The vehicle body 6 (shown in fig. 1) is supported by the bogie frame 9. Two bogie cross members 9a extending in the vehicle transverse direction are provided in the bogie frame 9 at a distance from each other in the vehicle longitudinal direction. Further, in the bogie frame 9, two bogie frame side members 9b extending in the vehicle longitudinal direction and respectively intersecting the two bogie frame cross members 9a are provided spaced apart from each other in the vehicle lateral direction.

Journal members 10 are provided at the front and rear ends of the bogie frame side members 9b, respectively. Therefore, the bogie frame cross member 9a is positioned closer to the center in the vehicle longitudinal direction than the journal member 10. A pair of wheels 8 are mounted on both ends of each journal member 10 in the vehicle transverse direction, and are capable of pivoting about the same axis 8a independently of each other. A wheel flange 8b is provided at an edge of the vehicle transverse direction inner side of the wheel 8. The journal member 10 is configured to extend adjacent to the road surface between both ends where the wheels 8 are mounted. A conical rubber 11 is provided as a shaft spring of the wheel 8 between the bogie frame side member 9b and the end of the journal member 10. The end of the journal member 10 is mounted to the bogie frame side member 9b via a conical rubber 11. The conical rubber 11 is configured to absorb vibration from the wheel 8 in the vehicle up-down direction.

Rotation suppression dampers 12 are provided on the vehicle front side and the vehicle rear side of the bogie 7. The rotation suppressing damper 12 is arranged along an axis 12a extending in the vehicle lateral direction, and is inclined in the vehicle up-down direction. The rotation-suppressing damper 12 is configured to be able to absorb a force applied from the vehicle lateral direction. The axis 12a of the rotation-suppressing damper 12 is separated from the intermediate point 13 of the bogie frame 9 by a distance E in the vehicle longitudinal direction. The intermediate point 13 of the bogie frame 9 is positioned at the intersection of the axis 8c and the axis 8d, the axis 8c passing through the centers in the vehicle transverse direction of the pair of wheels 8 in the linear rail running state and extending in the vehicle longitudinal direction, and the axis 8d passing through the center between the wheels 8 on the vehicle front side and the vehicle rear side in the linear rail running state and extending in the vehicle transverse direction.

One end of the vehicle front side rotation suppression damper 12 is attached to the front side portion of the bogie frame cross member 9a on the vehicle front side via a spherical flange. The other end of the rotation suppressing damper 12 on the vehicle front side is attached to a receiving portion 6a provided in the vehicle body 6 via a spherical flange. One end of the vehicle rear side rotation suppression damper 12 is attached to the rear side portion of the bogie frame cross member 9a on the vehicle rear side via a spherical flange. The other end of the rotation suppressing damper 12 on the vehicle rear side is mounted to a receiving portion 6a provided in the vehicle body 6 via a spherical flange.

Stopper members 14 are provided on the vehicle front side and the vehicle rear side of the bogie 7. The stopper member 14 is disposed along the axis 12a of the rotation suppressing damper 12, and is attached to the bogie frame cross member 9 a. Stopper rubbers 14a are provided at both side portions of the stopper member 14 in the vehicle transverse direction, respectively. On the other hand, a stopper receiving portion 6b is provided in the vehicle body 6 along the axis of the rotation suppression damper 12. The stopper member 14 is disposed between the receiving portion 6a and the stopper receiving portion 6b of the vehicle body 6. The stopper member 14 is disposed apart from the receiving portion 6a and the stopper receiving portion 6b of the vehicle body 6 by a distance F in the vehicle transverse direction. Therefore, the rotation of the vehicle body 6 is regulated by the contact of the stopper member 14 on the bogie 7 side with the receiver 6a or the stopper receiver 6b on the vehicle body 6 side.

A pair of flexible traction rods 15 are provided in the bogie 7. The flexible traction rod 15 is arranged along an axis 15a extending in the vehicle longitudinal direction, and is configured to be able to expand and contract in the vehicle longitudinal direction. The axis 15a of the flexible traction rod 15 is separated from the intermediate point 13 of the bogie frame 9 by a distance D in the vehicle transverse direction. Therefore, the pair of flexible traction rods 15 are arranged so as to be spaced apart from each other in the vehicle transverse direction in left-right symmetry in the vehicle transverse direction. An end portion 15b of the flexible traction rod 15 on the vehicle front side is attached to a receiving portion 6c provided in the vehicle body 6 (shown in fig. 1) via a spherical flange. An end 15c of the flexible traction rod 15 on the vehicle rear side is attached to the bogie frame cross member 9a on the vehicle rear side via a spherical flange.

With this configuration, the maximum rotation θ of the bogie 7 relative to the vehicle body 6 about the intermediate point 13 of the bogie frame 9 is tan^-1(F/E)。

An example of the structure of the flexible traction rod 15 is explained with reference to fig. 4 (a). In fig. 4(a), the flexible traction rod 15 is in a freely supported state. The flexible traction rod 15 includes a piston rod 16 extending in a longitudinal direction of the flexible traction rod 15 and a cylindrical cylinder 17 extending in the longitudinal direction. A head 16a is provided at the distal end of the piston rod 16. A cap 16b is provided at the proximal end of the plunger rod 16. A stopper portion 16c is provided in the lid portion 16 b. A rod portion 16d is provided between the head portion 16a and the cap portion 16 b.

Both ends 17a and 17b of the cylinder 17 in the longitudinal direction are formed closed. Through holes are opened at both ends to allow the piston rod 16 to penetrate the cylinder 17 and to allow the cap portion 16b and the rod portion 16d of the piston rod 16 to move in the longitudinal direction in the cylinder 17. The head portion 16a of the piston rod 16 and the end portion 17a of the cylinder 17 located in the direction of the head portion 16a contact each other, and regulate the movement of the piston rod 16 in the longitudinal direction toward the cap portion 16 b. On the other hand, the stopper portion 16c of the piston rod 16 and the end portion 17b of the cylinder 17 located in the cap portion 16b direction are arranged to be spaced apart from each other by a distance G in the longitudinal direction. The maximum movement distance of the piston rod 16 in the longitudinal direction in the direction of the head 16a is G.

Further, a coil spring 18 is provided in the cylinder 17 in the longitudinal direction. A guide washer 19 is provided between the coil spring 18 and the end 17b in the direction of the lid portion 16 b. The guide washer 19 comes into contact with the cap portion 16b of the piston rod 16. When the cap portion 16b is moved in the longitudinal direction toward the head portion 16a, the guide washer 19 moves together with the cap portion 16b, and the coil spring 18 is compressed.

As for the structure of the flexible traction rod 15, as another example, a rubber member 20 may be provided instead of the coil spring 18 as shown in fig. 4 (b).

In the flexible traction rod 15 configured as described above, in fig. 2, the cap portion 16b of the piston rod 16 is disposed in a state in which the cap portion 16b is moved in the direction of the head portion 16 a. This state is a neutral state of the flexible traction rod 15. With the coil spring 18 in a compressed state, a preload P is applied to the flexible traction rod 15. For example, the magnitude of the preload P may be set by the load applied to the flexible traction rod 15 when the vehicle at full load is applied with the maximum acceleration and the margin of the load. The bogie 7 can be prevented from turning relative to the vehicle body 6 due to the influence of the vehicle weight or the like during the curved track running. In other words, the running stability of the vehicle during the straight track running can be ensured. The structure of the flexible traction rod 15 shown in fig. 4(a) and 4(b) is merely an example. Other structures are also possible as long as the flexible traction rod 15 can be extended and retracted.

With regard to such a vehicle in the first embodiment, the operation when running along a curved track is explained with reference to fig. 2, 3 and 5. Fig. 5 is a view of the vehicle as viewed from above. The direction of travel of the vehicle is shown by arrow a.

When the front vehicle 2 on the vehicle front side enters the curved track, the wheel 8 on the outer rail side of the pair of wheels 8 comes into contact with the track 1, and a force toward the vehicle transverse direction inner side is applied to the wheel 8 on the outer rail side. Then, the carriage 7 receives a force to rotate with respect to the vehicle body 6. At this time, one of the pair of flexible traction rods 15 is extended, and the other of the pair of flexible traction rods 15 is contracted. Therefore, the bogie 7 is rotated by the angle θ maximally about the midpoint 13 of the bogie frame 9 with respect to the vehicle body 6. This operation is also performed in the front vehicle 2 on the vehicle rear side.

As described above, with the vehicle in the first embodiment of the present invention, the force in the straight direction generated by the inertia of the vehicle body 6 is absorbed by the rotation of the bogie 7, and the influence on the bogie 7 is less likely. The trolley 7 is easily bent along a curved track. Therefore, the wheels 8 become a state of following the curved track more closely, and the vehicle can enter the curved track at a small angle of attack. Therefore, when the vehicle enters a curved track, the contact pressure between the wheel 8 on the outer rail side and the track 1 is relaxed, the side pressure applied to the vehicle is reduced, and the vehicle is prevented from vibrating and creaking. Therefore, the riding comfort of the passenger is improved, and the wear of the wheel flange 8b is reduced. In other words, the vehicle can smoothly pass through the curved track.

With the vehicle in the first embodiment of the invention, when the vehicle enters a curved track, in addition to the force acting on the bogie 7 from the track 1, when the vehicle receives an external force from the vehicle lateral direction, such external force is absorbed by the rotation suppressing dampers 12 provided on the vehicle front side and the vehicle rear side. Therefore, the bogie 7 can be prevented from rotating relative to the vehicle body 6 by a force other than the force acting on the bogie 7 from the rail 1. Thus, the bogie 7 rotates relative to the vehicle body 6 only when the vehicle enters the curved track. On the other hand, during the straight track running of the vehicle or the like, the bogie 7 does not rotate relative to the vehicle body 6, ensuring the running stability of the vehicle. Since the amount of movement of the dolly 7 in the vehicle lateral direction is restricted by the stopper member 14, the dolly 7 is prevented from largely rotating, further ensuring the running stability of the vehicle.

Second embodiment

A vehicle according to a second embodiment of the invention is explained below. In the second embodiment, as in the first embodiment, the vehicle is explained using an LRV as an example of the vehicle. The basic configuration of the vehicle in the second embodiment is the same as that of the vehicle in the first embodiment. The same reference numerals and names as those in the first embodiment will be used to describe the same components as those in the first embodiment. The following explains components different from those of the first embodiment. In the description of the second embodiment, it is assumed that the running direction of the vehicle is toward the front of the vehicle.

The structure of the carriage 7 in the second embodiment will be described with reference to the carriage 7 in the straight-line running state shown in fig. 6. A traction rod 21 is provided in the carriage 7. The traction rod 21 is arranged along an axis 8c, the axis 8c passing through the center between the wheels 8 on the vehicle front side and the vehicle rear side in the straight-line track running state and extending in the vehicle lateral direction. An end 21a of the traction rod 21 on the vehicle rear side is attached to a receiving portion 6d provided in the vehicle body 6 (shown in fig. 1) via a spherical flange. An end 21b of the traction rod 21 on the vehicle front side is attached to the bogie frame cross member 9a on the vehicle rear side via a spherical flange.

A pair of restoring rods 22, which constitute the same flexible traction rods 15 as in the first embodiment, are provided in the bogie 7. As an example, the restoring rods 22 are respectively disposed on the left and right sides of the traction rod 21 in the vehicle transverse direction. As another example, the restoring rod 22 may be provided only on one of the left and right sides of the traction rod 21 in the vehicle transverse direction. An end portion 22a of the restoring rod 22 on the vehicle rear side is attached to a receiving portion 6e provided in the vehicle body 6 (shown in fig. 1) via a spherical flange. An end portion 22b of the restoring rod 22 on the vehicle front side is attached to the bogie frame cross member 9a on the vehicle rear side via a spherical flange.

With regard to such a vehicle in the second embodiment, the operation when running along a curved track is explained with reference to fig. 4 and 6.

When the front vehicle 2 on the vehicle front side enters the curved track, the wheel 8 on the outer rail side of the pair of wheels 8 comes into contact with the track 1, and a force toward the vehicle transverse direction inner side is applied to the wheel 8 on the outer rail side. Then, the carriage 7 receives a force to rotate with respect to the vehicle body 6. At this time, while the traction rod 21 is used as a support reference, one of the pair of restoring rods 22 is extended, and the other of the pair of restoring rods 22 is contracted. Therefore, the bogie 7 is rotated by the angle θ maximally about the midpoint 13 of the bogie frame 9 with respect to the vehicle body 6. This operation is also performed in the front vehicle 2 on the vehicle rear side.

As described above, with the vehicle in the second embodiment of the present invention, the force in the straight direction generated by the inertia of the vehicle body 6 is absorbed by the rotation of the bogie 7, and the influence on the bogie 7 is less likely. The trolley is easily bent along a curved track. Therefore, the wheels 8 become a state of following the curved track more closely, and the vehicle can enter the curved track at a small angle of attack. Therefore, when the vehicle enters a curved track, the contact pressure between the wheel 8 on the outer rail side and the track 1 is relaxed, the side pressure applied to the vehicle is reduced, and the vehicle is prevented from vibrating and creaking. Therefore, the riding comfort of the passenger is improved, and the wear of the wheel flange 8b is reduced.

With the vehicle in the second embodiment of the invention, when the vehicle enters a curved track, in addition to the force acting on the bogie 7 from the track 1, when the vehicle receives an external force from the vehicle lateral direction, such external force is absorbed by the rotation suppressing dampers 12 provided on the vehicle front side and the vehicle rear side. Therefore, the bogie 7 can be prevented from rotating relative to the vehicle body 6 by a force other than the force acting on the bogie 7 from the rail 1. Thus, the bogie 7 rotates relative to the vehicle body 6 only when the vehicle enters the curved track. On the other hand, during the straight track running of the vehicle or the like, the bogie 7 does not rotate relative to the vehicle body 6, ensuring the running stability of the vehicle. Since the amount of movement of the dolly 7 in the vehicle lateral direction is restricted by the stopper member 14, the dolly 7 is prevented from largely rotating, further ensuring the running stability of the vehicle.

The embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments. Many different variations and modifications are possible based on the technical idea of the present invention.

For example, as a first modification of the embodiment of the invention, with regard to the configuration of the vehicle, as long as the dollies 7 are provided in the front vehicles 2 and one intermediate vehicle 3 is arranged between two front vehicles 2, the number of the front vehicles 2 and the number of the intermediate vehicles 3 may be different from those in the above-described embodiment. The same effects as those described in the above embodiments can be obtained.

As a second modification of the embodiment of the present invention, a vibration-proof rubber may be provided instead of the guide washer 19 of the flexible traction rod 15 or the restoring rod 22. Further, it is possible to absorb the swing of the carriage 7 and effectively prevent the occurrence of the deflection of the journal member 10 and the wheel 8 accompanying the swing.

List of reference numerals

1: track

2: front vehicle

3: intermediate vehicle

4: connecting part

5: pin connector

6: vehicle body

6a, 6c, 6d, 6 e: receiving part

6 b: stopper receiving part

7: trolley

8: wheel of vehicle

8a, 8c, 8 d: axial line

8 b: wheel flange

9: bogie frame

9 a: bogie frame cross beam

9 b: side beam of bogie frame

10: journal component

11: conical rubber

12: rotation-inhibiting vibration damper

12 a: axial line

12b, 12 c: end part

13: intermediate point

14: stop member

14 a: stop rubber

15: flexible traction rod

15 a: axial line

15b, 15 c: end part

16: piston rod

16 a: head part

16 b: cover part

16 c: stopper part

16 d: rod part

17: cylinder body

17a, 17 b: end part

18: spiral spring

19: guide washer

20: rubber member

21: draw bar

21a, 21 b: end part

22: restoring rod

22a, 22 b: end part

A, B, C: arrow head

D, E, F, G: distance between two adjacent plates

O: center of a ship

α, β, θ: angle of rotation

Claims (2)

1. A low-floor vehicle comprising:

a trolley arranged under the trolley body;

a carriage frame configured as a frame member of the carriage;

a pair of bogie frame cross members arranged in a vehicle transverse direction at a middle of the bogie frame in a vehicle longitudinal direction and arranged to be spaced apart from each other in the vehicle longitudinal direction; and

a pair of wheels provided on a vehicle front side and a vehicle rear side with respect to a pair of bogie frame cross members of the bogie frame, respectively, and configured to run on a track, wherein

A pair of flexible traction rods arranged in a vehicle longitudinal direction and configured to be capable of telescoping in the vehicle longitudinal direction are provided in the bogie, the pair of flexible traction rods being arranged to be spaced apart from each other in a vehicle lateral direction, one end of each flexible traction rod being mounted to the bogie frame cross member, and the other end of each flexible traction rod being mounted to a receiving portion provided in a vehicle body; and is

The dolly is configured to be rotatable with respect to a vehicle body,

a rotation suppressing damper disposed in a vehicle lateral direction and configured to be able to absorb a force in the vehicle lateral direction is provided at each of a front side portion of a bogie frame cross member on a vehicle front side and a rear side portion of the bogie frame cross member on a vehicle rear side, one end of the rotation suppressing damper is attached to the bogie frame cross member, and the other end of the rotation suppressing damper is attached to a receiving portion provided in a vehicle body,

a stopper receiving portion provided in the vehicle body along an axis of the rotation suppression damper is disposed separately from a receiving portion on which the other end of the rotation suppression damper is mounted in a direction away from the rotation suppression damper in a vehicle lateral direction, and

a stopper member provided in the bogie is disposed between the receiving portion to which the other end of the rotation suppressing damper is attached and the stopper receiving portion, and is configured to be able to come into contact with the receiving portion to which the other end of the rotation suppressing damper is attached and the stopper receiving portion to regulate the rotation of the vehicle body.

2. A low-floor vehicle comprising:

a trolley arranged under the trolley body;

a carriage frame configured as a frame member of the carriage;

a pair of bogie frame cross members arranged in a vehicle transverse direction at a middle of the bogie frame in a vehicle longitudinal direction and arranged to be spaced apart from each other in the vehicle longitudinal direction; and

a pair of wheels provided on a vehicle front side and a vehicle rear side with respect to a pair of bogie frame cross members of the bogie frame, respectively, and configured to run on a track, wherein

A traction rod disposed in the bogie in a vehicle longitudinal direction at a center in a vehicle transverse direction, one end of the traction rod being attached to the bogie frame cross member and the other end of the traction rod being attached to a receiving portion provided in a vehicle body;

a restoring rod disposed in a vehicle longitudinal direction and configured to be expandable and contractible in the vehicle longitudinal direction, one end of the restoring rod being mounted to the bogie frame cross member, and the other end of the restoring rod being mounted to a receiving portion provided in a vehicle body, at least one of left and right outer sides of the drawbar in the vehicle transverse direction; and is

The dolly is configured to be rotatable with respect to a vehicle body,

a rotation suppressing damper disposed in a vehicle lateral direction and configured to be able to absorb a force in the vehicle lateral direction is provided at each of a front side portion of a bogie frame cross member on a vehicle front side and a rear side portion of the bogie frame cross member on a vehicle rear side, one end of the rotation suppressing damper is attached to the bogie frame cross member, and the other end of the rotation suppressing damper is attached to a receiving portion provided in a vehicle body,

a stopper receiving portion provided in the vehicle body along an axis of the rotation suppression damper is disposed separately from a receiving portion on which the other end of the rotation suppression damper is mounted in a direction away from the rotation suppression damper in a vehicle lateral direction, and

a stopper member provided in the bogie is disposed between the receiving portion to which the other end of the rotation suppressing damper is attached and the stopper receiving portion, and is configured to be able to come into contact with the receiving portion to which the other end of the rotation suppressing damper is attached and the stopper receiving portion to regulate the rotation of the vehicle body.