JP2003025993A - Single shaft bogie for railway rolling stock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a single shaft bogie for railway rolling stock dispersedly supporting a part of the weight of a shaft beam on a vehicle body on a spring and on a bogie frame beam between springs, capable of reducing load applied to a track and smoothly steering a wheel along a line, even in a steeply curved line having a minimum rotation radius of <=30 m. SOLUTION: Both sides of one end part of the bogie frame beam 11 provided with a side beam part 11a are connected to a bottom surface of the vehicle body 2 via a bogie frame beam pin 17 so that the other end side may be oscillated in the vertical direction. A bolster spring 21 is interposed between the vehicle body 2 and the bogie frame beam 11. A pair of left and right shaft beams 12 are arranged in almost parallel to the side beam part 11a on a lower side of the bogie frame beam 11. One end part of each shaft beam 11 is connected to end parts on the bogie frame beam pin 17 sides of the bogie frame beams 12 via a shaft beam pin 19 so that the other end side may be oscillated in the vertical direction. A shaft spring 24 is interposed between the bogie frame beam 11 and the shaft beam 12. A wheel 14 rotatably supported by each bearing is steerably mounted on each shaft beam 12 with a king pin 26 as a center via a knuckle 28.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a single-axle bogie for a railroad vehicle (one bogie frame provided with a pair of wheels), and is particularly suitable for a low floor tram among railroad vehicles. More specifically, the present invention relates to a uniaxial truck that can travel on a curved road with a small turning radius (for example, less than 30 m), and that each of the left and right wheels independently steer (turn horizontally).

[0002]

2. Description of the Related Art Recently, LRT (Lig (Lig)) has characteristics such as energy saving, low pollution and barrier-free.
The tram called "ht Rail Transit" has been reevaluated, and its introduction is progressing in various cities including Europe and America. In this type of tram, the vehicle weight is light, and the bogie portion that travels on the track can be configured by a single-axle bogie. As is well known, the uniaxial bogie has a drawback that the bogie is likely to pitch because the bogie frame has only one wheel on each side.

Therefore, for example, in a high-floor uniaxial bogie where the floor of the vehicle is located at a considerably high position (800 to 1100 mm) from the track, a pair of upper and lower radius rods are arranged in front of and behind the bogie frame. DSB based on the prevention of pitching by the rod tension
A uniaxial bogie (Danske Stades Banen) is in operation.

As other prior art, Japanese Patent Laid-Open No. 10-2
There is a single-axle truck described in Japanese Patent No. 50573. This bogie supports both ends of one wheel axle on a bogie frame via shaft springs having a high elastic modulus, and supports the vehicle body by a plurality of pillow springs between the bogie frame and the vehicle body. It has a structure in which the frame and the vehicle body are connected by a traction mechanism that restricts relative movement in the front-rear direction. There is also a trolley described in JP-A-60-64065.

By the way, each of the trucks according to the above-mentioned prior art has a structure in which the trucks having the left and right wheels pivotally support the vehicle to travel along a curved road, so that the turning radius of the curved road is, for example, 30 m or less. When it becomes such a sharp curve,
There is a risk that the wheels will not follow the curved trajectory and cannot steer (horizontal turn). In other words, in such a sharp curve, the behavior that the wheels have an opposite attack angle with respect to the rail cannot be seen because the radius difference between the left and right wheels cannot be complemented only by the tread slope of the wheels. In order to avoid this, it is necessary to individually steer the left and right wheels independently, but a truck having such a structure is proposed in, for example, European Patent Publication No. 308720. In this trolley, a pair of wheels facing each other are supported horizontally inside a trolley frame via vertical pins (a kind of king pin) so as to be horizontally rotatable.

[0006]

However, in the above-mentioned conventional DSB bogie and the bogie described in the above publication,
It is inconvenient in the following points.

That is, the height of the floor of the vehicle is 3 from the track.
In the case of applying to a low floor type tram that is only about 00 mm, it is necessary to make the floor surface at the position where the carriage is arranged considerably high, and the floor surface becomes uneven. In other words,
Not applicable to 100% low floor trams. A trolley according to the related art, such as the trolley disclosed in Japanese Patent Laid-Open No. 60-64065, is a two-axle trolley for a general trolley of a railway and a steering trolley with improved curve passing property, and each axle is rotatable. Since the left and right wheels are integrally and rotatably connected to each other by the formula, it is not suitable for a dolly of the present invention, which is intended for a single-axle dolly and an axle part for connecting the left and right wheels is omitted.

Further, in the above-mentioned conventional bogie, the drive motor is mounted on the bogie frame or the connecting beam, and the driving force is transmitted to the wheels via the speed reducer mounted on the bogie frame or the connecting beam. The structure is very complicated because the wheels are driven through the speed reducer using joints, and the unsprung weight of this trolley is not only the weight of the wheel axle and the speed reducer mounted on the axle, but also the connecting beam. Since the reduction gear and even a part of the drive motor are included, the unsprung weight becomes extremely large, so that the load on the track such as rails is enormous and easily damaged, which also adversely affects the riding comfort.

Further, in the bogie equipped with the steerable wheels described in the above-mentioned European Patent Publication, the axle member is enlarged to become a bogie frame member, and a drive motor and a speed reducer are directly mounted on the bogie frame member. Therefore, the unsprung weight is large because it includes all the weight of the wheel axle, motors, speed reducers, and bogie frame members. For this reason, the vibration to the motor and the vibration load on the track are large, which adversely affects durability and riding comfort. Moreover, since the system steers the wheels, there are many link mechanisms including those for coupling the bogie frame and the vehicle body, and the structure is complicated.

The present invention has been made in view of the above points,
Suitable for low-floor trams, part of the weight of the speed reducer and drive motor mounted on the axle beam that steerably mounts the wheels mounted on the track, A single axle for railway vehicles that can be distributed and supported by the bogie frame beams in between to reduce the load on the track and that the wheels can steer smoothly along the track even on a sharp curved road with a minimum turning radius of 30 m or less. The purpose is to provide a dolly.

[0011]

In order to achieve the above object, a uniaxial bogie for a railroad vehicle according to the present invention (a non-driving bogie and a driving bogie) comprises an end portion of a bogie frame beam having an a) side beam portion. Both sides are connected to the bottom surface of the vehicle body via bogie frame beam pins so that the other end can swing vertically, and an elastic body such as an air spring is provided between the vehicle body and the other end portion of the bogie frame beam, b). Below the bogie frame beam, a pair of left and right shaft beams are arranged substantially parallel to the side beam portion, and one end of each shaft beam is attached to an end of the bogie frame beam on the bogie frame beam pin side. The other end side is connected to be swingable in the vertical direction via, and an elastic body such as a shaft spring is provided between the other end of the bogie frame beam and the shaft beam,
c) A wheel rotatably supported by bearings on each of the shaft beams is attached so as to be steerable around a kingpin via a knuckle.

In order to achieve the above object, a uniaxial bogie (driving bogie) for a railway vehicle according to the present invention comprises a bogie frame beam pin on the bottom surface of the vehicle body on both sides of one end of a bogie frame beam having an a) side beam portion. The other end is swingably connected in the up-down direction via an elastic body such as an air spring between the vehicle body and the other end of the bogie frame beam, and b) the side beam below the bogie frame beam. A pair of left and right shaft beams is arranged substantially parallel to the part, and one end of each shaft beam is vertically shaken at the other end side through the shaft beam pin at the end of the bogie frame beam on the bogie frame beam pin side. Movably connected, and an elastic body such as a shaft spring is provided between the other end of the bogie frame beam and the shaft beam, and c) a wheel rotatably supported by bearings is provided on each shaft beam via a knuckle. Attached so as to be able to steer around the king pin, and d) to the shaft beam pin side of each shaft beam. Provided rotating motor through a reduction gear that interior of the motor to the shaft beam, characterized in that connected to the wheel.

According to the uniaxial bogie according to the present invention (Claims 1 and 2) having the above-mentioned structure, the left and right wheels are freely rotatable through the bearings on the shaft beam and steerable through the kingpin. Since the left and right wheels turn substantially horizontally around the kingpin, the wheels are smoothly steered along the curve of the rail (track) even on a curved road with a minimum turning radius of 30 m or less.

Further, one end of the shaft beam is vertically swingably connected to the bogie frame beam through a pin, and one end of the bogie frame beam is vertically swingably connected to the vehicle body through a pin. An elastic body such as a spring member is provided between the other end of the bogie frame beam and the shaft beam, and between the other end of the bogie frame beam and the vehicle body. By bringing the shaft beam pin closer to the center of gravity of the motor, even if the motor is mounted on the shaft beam, most of the weight of the motor acts on the shaft beam pin, and the vibration behavior of the entire bogie is that the motor is mounted on the bogie frame beam. It will be similar to the above condition. Similarly, even if the motor is attached to the shaft beam by making the positions of the shaft beam pin and the bogie frame beam pin close to each other, most of the weight of the motor acts on the bogie frame beam pin and the vibration of the entire bogie is caused. The behavior is similar to the state where the motor is attached to the vehicle body. Weight distribution depends on the position of the center of gravity of each member and the relational position between the pin and the elastic body that supports it.
It is possible to set it freely. As a result, the motor approximates to the state of being attached to the bogie frame or the vehicle body, and the so-called unsprung weight is reduced, so the vibration received from the rail or other track is absorbed under the unsprung portion, and the vibration transmitted to the vehicle body is reduced. At the same time, the load on the orbit is reduced.

FIG. 18 shows the riding comfort.
In the spring system, m₀The partial weight of the axle beam (equivalent weight
Amount), m₁A part of the bogie frame beam (equivalent weight) and
Partial weight of axle beam (equivalent weight), m₂The body weight and
Assuming a partial weight (equivalent weight) of the bogie frame beam, m₁When
m₂The spring constant between₂, The damping coefficient of the damper is C₂,
m ₀And m₁The spring constant between₁, The damping coefficient of the damper
C₁Assuming that   m₁/ M₂≈ 0.3 k₂/ K₁Approximately 0.5
It is said that it is theoretically preferable to
According to Ming, as described above, the bogie frame pin, axle beam pin,
By adjusting the position of the center of gravity of the
The apparent (or equivalent) weight of the frame beam (or
Mass) m₀, M₁Is set to satisfy the above equation, and
And select the spring constant of each elastic body to satisfy the above equation.
This can be achieved relatively easily.

In FIG. 18, a spring is arranged under the rail, and the spring constant is k _r , which is a simplified representation of the spring system such as the rail including the track bed, m ₀
It can be seen that the smaller is, the less impact load is given to the track.

FIG. 19 is a diagram showing a resonance curve corresponding to the spring system of FIG. 18 in relation to each natural frequency. Here, in the case of C ₂ = ∞, m ₁ and m ₂ are integrated, and in order to improve the riding comfort in the diagram of FIG. 19, f ₁ · f ₃ · It is necessary to separate f ₂ appropriately, and it is concluded that m ₁ / m ₂ ≈0.3 and k ₂ / k
It is preferable that the ₁ ≒ 0.5 before and after.

Needless to say, the uniaxial bogie according to claim 1 can be applied not only to the non-driving bogie, but also to a driving bogie of the type in which the drive device is not built in the shaft beam but is exposed to the outside.

In the drive cart according to the second aspect, since a part of the shaft beam can be formed by the casing of the driving motor and the casing of the speed reducer, a structure is provided as compared with the case where the motor and the speed reducer are separately mounted on the shaft beam. Is simplified and lightened. This configuration is limited to the drive system carriage, and in the case of the non-drive system carriage, the drive motor and the speed reducer are omitted as described in claim 1. Further, in the uniaxial bogie according to claim 2, in addition to the weight of the shaft beam itself, the weight of the wheels, knuckles, bearings, and the like, the weight of the drive motor and the speed reducer is also added. For example, part of the weight of the shaft beam itself, wheels, etc., as well as part of the weight of the drive motor and speed reducer is moved from the shaft beam to the bogie frame beam side by the shaft beam pin on one end and the elastic body on the other end. The bogie frame beam pin on one end side and the elastic body on the other end side move and distribute the weight from the shaft beam to the bogie frame beam side or the vehicle body side, respectively (when the weight is moved and dispersed, the center of gravity or the force applied point). And is proportionally divided by the inverse ratio of the distance between the fulcrum and the support elasticity.) Therefore, it is particularly effective in improving the riding comfort and reducing the load on the running track.

According to a third aspect of the present invention, the bogie frame beam hangs down on the bogie frame beam pin side and both sides of the hanging part are integrally connected by lateral beams, and the shaft beam is opposite to the shaft beam pin. The ends can be pivotally connected by a lateral link.

According to another aspect of the present invention, the constituent members of the bogie frame beam whose one end is open are connected to the lateral beam with high rigidity. The shaft beam is pivotally supported with high rigidity except that the bobbin frame beam can be vertically swung on the shaft beam pin side (in the embodiment, the pin is divided into two parts so as to withstand a lateral load particularly applied to the wheel). It is arranged so that it can be supported against the lateral load that the wheel receives from the rail.) Also, on the open side of the other end, the left and right shaft beams are pivotally connected by a lateral link. Therefore, it is possible to maintain the wheels with sufficient rigidity against the lateral load received from the rails via the wheels and to secure the distance between the wheels.

According to a fourth aspect of the present invention, the drive motor is provided integrally with the shaft beam, and the shaft beam pin is attached to the bogie frame beam via a bracket projecting from a casing of the drive motor. The shaft beam may be swingably connected, the shaft beam may have a hollow structure, and the speed reducer may be incorporated in the shaft beam.

According to another aspect of the present invention, since the drive motor is suspended at one end of the bogie frame beam, a considerable part of the weight of the drive motor is transferred from the shaft beam to the bogie frame beam side. The weight on the shaft beam side is reduced. Further, a part of the shaft beam can be used together with the speed reducer box, and the structure can be simplified, and the speed reducer can be housed in the shaft beam without being exposed to the outside, and can be compactly compacted to achieve miniaturization.

According to a fifth aspect of the present invention, the bogie frame beam pin is provided with respect to the vehicle body so as to allow relative lateral movement between the vehicle body and the bogie frame beam, and between the vehicle body and the bogie frame beam. It is preferable to provide an elastic body around the bogie frame beam pin so as to suppress the relative lateral movement of the bogie frame beam pin.

According to the uniaxial bogie of claim 5, the uniaxial bogie can be moved relative to the vehicle body in the width (left-right) direction. Further, the elastic body is interposed between the vehicle body and the uniaxial bogie so that the lateral direction of the vehicle body is improved. Vibration and the like are reduced.

According to a sixth aspect of the present invention, one end of the bogie frame beam (the bogie frame beam pin side) is connected to the vehicle body via an elastic body or a suspension link so as to be swingable in the left-right direction, and the radius rod is connected. It is also preferable to connect them in the front-rear direction via.

With this configuration, the uniaxial bogie can be moved relative to the vehicle body in the width (left-right) direction, and lateral vibration of the vehicle body or the like is caused by an elastic body such as a buffer spring interposed between the vehicle body and the uniaxial bogie or a suspension link. Is reduced.

According to a seventh aspect of the present invention, the axle of the wheel and the output shaft of the speed reducer can be connected near the kingpin by a bendable power transmission shaft joint such as a constant velocity ball joint. .

According to the uniaxial bogie of claim 7, when the wheel attached to the shaft beam through the knuckle moves around the kingpin, the axle of the wheel placed on the track and traveling and the speed reducer. While bending the output shaft, the driving force from the drive motor is reliably transmitted to the steerable wheel axle by the bendable power transmission shaft joint such as a constant velocity joint.

As described in claim 8, the left and right steering arms are pivotally connected by tie rods with an inclination angle so that the wheels on the inner track side are steered more than the wheels on the outer track side. Is good.

With this structure, the rotation angle (steering angle) of the inner and outer wheels substantially matches the curvature of the track in the curved portion, and a large pressing force is prevented from acting on the outer track side. It turns smoothly along the curved part of.

According to a ninth aspect of the present invention, one end of the shaft beam is vertically moved with respect to the lower end of the one end of the bogie frame beam via an axial beam pin arranged substantially directly below the bogie frame beam pin. The wheel can be steerably attached to the other end of the shaft beam by connecting the other end of the shaft beam to the outside of the other end of the bogie frame beam.

According to the uniaxial bogie having this structure, one of the vehicles can be completely mounted on the uniaxial bogie in the vicinity of the connecting point of the articulated vehicle, and interference with the other vehicle hardly occurs. It is most suitable to be placed at the connection point of.

According to a tenth aspect of the present invention, in the uniaxial bogie according to the tenth aspect, one end portion of a pair of left and right shaft beams is connected to the bottom surface of the vehicle body via a shaft beam pin so that the other end can swing vertically, and An elastic body such as a shaft spring is provided between the end side and the vehicle body, and wheels that are rotatably supported by bearings on the shaft beams are rotatably mounted around a kingpin via a knuckle, and A driving motor is provided on the shaft beam pin side of each shaft beam, and the motor is connected to the wheels via a reduction gear installed in the shaft beam.

The present invention having the above structure (claim 10)
According to the uniaxial cart (driving cart) according to the above, since the left and right wheels are rotatably attached to the shaft beam via bearings and steerable via kingpins, the left and right wheels are almost rotated around the kingpins. Since the vehicle turns horizontally, each wheel smoothly steers along the curve of the rail (track) even on a curved road with a minimum turning radius of 30 m or less.

Further, one end of the shaft beam is swingably connected to the vehicle body in the vertical direction via a shaft beam pin, and an elastic body such as a shaft spring is interposed between the other end side of the shaft beam and the vehicle body. Since it is installed, a part of the weight of the wheels attached to the shaft beam, the drive motor, the speed reducer, and the shaft beam itself is transferred to the upper vehicle body by the relationship between the center of gravity position and the shaft beam pin, and Part of the weight is dispersed and supported. As a result, the load acting on the track from the shaft beam is reduced, and the load on the track is reduced.

[0037]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments in which the single-axle bogie for railway vehicles of the present invention is applied to a low floor type tram will be described below with reference to the drawings.

FIG. 1 is a side view showing an articulated vehicle of a 100% low floor type two-car train to which the uniaxial bogie according to the embodiment of the present invention is applied. FIG. 2 shows the uniaxial bogie according to the embodiment of the present invention. It is a side view which shows a 100% low floor single vehicle. FIG. 4 shows a uniaxial bogie arranged at the right end of the vehicle of FIGS. 1 and 2 according to an embodiment of the present invention. FIG. 4 (a) is an enlarged plan view in which the right half is omitted, and FIG. 4 (b) is Fig. 5 (a) is a left side view, Fig. 5 (a) is a front view of Fig. 4 (a), and Fig. 5 (b) is a plan view showing a state in which the wheels of the uniaxial truck of Fig. 5 (a) are steered in the left-right direction. The bogie frame beams and side beams are omitted.

As shown in FIGS. 1 and 2, in each tram 1.1 ', the floor 3 is 300 m from the rail 9 as a track.
It is a 100% low-floor type, which is located at a height of around m. It consists of a flat floor.

FIG. 3 shows a partially fixed floor type two-car formation tram, in which the floor surface 3 ′ at the front or rear (end) of the vehicle is made higher than the floor surface 3 at other portions. There is. For this reason, the tram 1 "of this example is not limited to the uniaxial bogies 10 to 10-2 of the present invention described later except the bogie 10" of the connecting portion, and the left and right wheels 14 and 14 are connected by an axle. It is also possible to use a general trolley (not shown).

As shown in FIG. 4, the uniaxial bogie 10 includes a bogie frame beam 11, a shaft beam 12, bearings 13, wheels 14, a drive motor 15, and the like. The bogie frame beam 11 is provided with a side beam portion 11a, and a vertical beam portion 11c is extended downward from one end portion (rear end side, but the front-rear direction may change, in which case the front beam side). It is formed in a substantially L shape when viewed from the side, and the left and right vertical beam portions 1
The lower end portions of 1c are integrally connected by a lateral beam 11d to form a "substantially U" shape in a plan view. Both upper rear ends of the bogie frame beam 11 are connected to a bracket 16 fixed downward on the bottom surface of the vehicle body 2 via horizontal bogie frame beam pins 17, and the other end side (front end side) of the bogie frame beam 11 is connected. Can swing (rotate) in the vertical direction.

That is, both ends of the bogie frame beam pin 17 are fixed between the pair of brackets 18, 18 on the bogie frame beam 11 side as shown in FIG. 6A, and laterally moved within a certain range on the pin 17. A rubber bush-shaped vibration-proof rubber 20 integrally provided with an outer cylinder 20a on the outer periphery is joined to the outer peripheral surface of a sleeve 20c having a ball spline structure that is mounted as possible to form a unit. This unit is constructed by vulcanizing and adhering the vibration-proof rubber 20 between the sleeve 20c and the outer cylinder 20a. Then, this unit and the bracket 16 on the vehicle body 2 side are integrally fixed. Note that, for example, stopper rubbers (not shown) are attached to both sides of the movement range so that the movement range of the sleeve 20c is restricted on the pin 17. Besides, for example, as shown in FIG. 6C, a vibration-proof rubber 20 'having a plurality of laminated cylindrical rubber bodies.
May be connected on the pin 17.

With this configuration, the bogie frame beam 11 can swing vertically with respect to the vehicle body 2 about the pin 17, and the lateral movement of the vehicle body 2 and the bogie frame beam 11 is allowed. A sleeve provided with a linear ball or a linear bush may be used instead of the ball spline structure, and the lateral movement may be shared by the ball spline or the linear bush, and the vibration transmitted from the truck to the vehicle body 2 is prevented by a rubber bush or the like. Shut off with a vibrating rubber 20.

The amount of lateral movement is small or the anti-vibration rubber 20
・ If you can take a large space of 20 ', do not use a mechanically sliding one such as a ball spline,
For example, the sleeve 20c is integrally mounted on the pin 17, and the bobbin frame beam 11 can be laterally moved along the pin 17 and vertically swung about the pin 17 only by the shearing deformation of the rubber bush. Further, the vibration transmitted from the truck to the vehicle body 2 can be blocked by the rubber bush, and the rubber bush is an effective means from the viewpoint of maintenance.

As shown in FIG. 4B, the bogie frame beam 11
The other end side is horizontally extended with a downward inclination, and a pillow spring 21 made of an elastic body such as an air spring, a rubber spring or a coil spring is provided between the horizontal portion 11e and the bottom surface of the vehicle body 2. ing.

The shaft beam 12 is arranged substantially parallel to the lower part of the bogie frame beam 11, and the casing 15a of the drive electric motor 15 is integrally fixed to the inner surface of the rear end portion of the shaft beam 12. A pair of brackets 22 and 22 are provided so as to project downward from the lower portion of the motor casing 15a, and a pair of support pieces 2 corresponding to the brackets 22 and 22 are provided on both sides of the lateral beam 11d.
3 and 23 project rearward, and the shaft beam 12 is connected to the bogie frame beam 11 by the shaft beam pin 19 so that the other end side can swing vertically. A shaft spring 24 made of an elastic material such as laminated rubber or a compression spring is provided between the other end of the shaft beam 12 and the other end of the bogie frame beam 11. Further, both ends of the lateral link 25 are rotatably connected to each other between the other ends of the left and right shaft beams 12 by support pins 25a, and are formed into a substantially U-shaped cross section in a plan view. However, the direction of the "U" shape is opposite between the bogie frame beam 11 and the shaft beam 12.

Inside the left and right axle beams 12, the kingpin 26 and the knuckle 2 which the wheels 14 are vertical axes, respectively.
It is provided so as to be steerable (horizontal turning) via 8 and rotatable via a bearing 13. More specifically, for example, as shown in FIG. 13, the inner peripheral portion of the wheel 14 is rotatably supported around the axle 28b via a bearing 13, and the wheel 14 is
And the drive shaft 27 are integrally rotatably connected. In the case of this example, the axle 28b is integral with the knuckle 28, and with this configuration, the wheel 14 horizontally turns around the kingpin 26 through the knuckle 28 together with the axle 28b and the bearing 13.

As shown in FIG. 5 (b), the arms 28a are integrally extended from the knuckle 28, and the tips of the knuckle arms 28a are curved inwardly and inclined to incline the knuckle arms 28a on both sides. Tie rod 2 at the tip
9 are rotatably connected to each other via vertical connecting pins 29a. The inclination degree of the tip portions of the left and right knuckle arms 28a is set so that the steering angle of the wheels 14 on the inner gauge side is larger than the steering angle of the wheels 14 on the outer gauge side.
As shown in FIG. 5A, the floor surface 3 of the vehicle body 2 is provided so as to avoid the left and right wheels 14, and can be flush with the floor surface of the portion where the front and rear uniaxial bogies 10 are not arranged. . In addition, by arranging the portions surrounded by the hoods of the seats and the connecting portions at the portions where the wheels 14 are located on both sides, the floor surface height is 300 m.
A vehicle with a 100% low floor of about m can be realized.

The shaft beam 12 is provided with a hollow casing 12a as shown in FIG. 14, and is used for connection between the drive shaft 15c of the electric motor 15 and the drive shaft 27 of the wheel 14 (FIG. 13). A machine 30 is arranged in the axial beam 12. In this example, the speed reducer 30 has a structure in which a plurality of small and large reduction gears are combined and meshed. A reduction gear 30a is meshed with a drive pinion 15b that rotates integrally with the drive shaft 15c of the electric motor 15. As shown in FIG. 13, an output shaft 31 is connected to the final reduction gear 30c via a spline 31a so as to be integrally rotatable. The output shaft 31 is rotated by a bearing 32 in the shaft beam 12 via the reduction gear 30c. Supported as possible. Further, the output shaft 31 is the shaft beam 12
Is projected toward the inner knuckle 28 and is connected to the drive shaft 27 with a constant velocity ball joint 33 (FIG. 23) interposed.

The constant velocity joint 33 is the wheel 1 on the rail 9.
By manipulating 4 around the king pin 26, the driving force can be transmitted to the wheels 14 even when the relative relationship between the shaft beam 12 and the wheels 14 is no longer parallel. In FIG. 13, reference numeral 48 is a boot, reference numeral 49 is a plain bearing, and reference numeral 49a is a thrust bearing.
Instead of the constant velocity ball joint 33 (FIG. 23),
It is also possible to use bendable drive force transmission joints 33 ', 33 "as shown in Figures 21 (a) and (b) and Figures 22 (a) and (b). 33 'is a structure in which two cross joints are assembled, and reference numeral 41 in the drawing is a sleeve, which is rotatable between the inner peripheral surface of the sleeve 41 and the cross pin and transmits the driving force.
By using two columns, constant velocity can be obtained. FIG. 22
The drive force transmission joint of is a gear type drive force transmission joint 33 ",
It has constant velocity. In FIG. 22, reference numeral 42 is an internal gear, and reference numeral 43 is an external gear.

The uniaxial bogie 10 of this embodiment is constructed as described above. The left end of the articulated vehicle 1 and the left end of the uniaxial bogie 10 of the single vehicle 1 are arranged in the front-rear direction with the respective constituent members of the uniaxial bogie 10. Basically common, only arranged symmetrically. Further, as the uniaxial bogie 10 ″ arranged at the connecting point of the articulated vehicle 1, the same one as the uniaxial bogie 10 can be used. However, as for the uniaxial bogie 10-3 suitable for the connecting point, examples will be given. See below.

By the way, in FIG. 6 (b), the center position of the vehicle body 2 is one side away from the carriage 10 by a distance s (usually around 25 mm).
It shows the state that it has been laterally moved only by the bogie frame beam pin 17
With the ball spline configured by the sleeve 20c and the sleeve 20c, the vibration-proof rubber 20 moves in the axial direction of the pin 17, and the pillow spring 21 is also deformed to one side (side) to suppress lateral vibration of the vehicle body 2. .

FIG. 7A shows a state in which the front end side of the shaft beam 12 swings upward with respect to the bogie frame beam 11, and the shaft beam 12 swings up and down about the shaft beam pin 19. By expanding and contracting the shaft spring 24, the vibration of the wheel 14 is absorbed. FIG. 7B shows a state in which the front end side of the bogie frame beam 11 swings upward with respect to the vehicle body 2. The bogie frame beam 11 swings up and down around the bogie frame beam pin 17 and the pillow spring. Since 21 expands and contracts, the vibration transmitted from the wheel 14 via the shaft spring 24 is absorbed.

FIG. 8 shows another embodiment of the uniaxial bogie of the present invention. In the uniaxial bogie 10-1 of this embodiment, the tread brake unit 34, the brake pad 34a thereof and the wheel 14 of the wheel 14 are mounted on the knuckle arm 28a. It is placed facing the tread. The tread brake unit 34 has a simple structure, and the brake pad 34a is floated from the tread of the wheel 14 by hydraulic pressure against a spring (not shown) to release the brake. By adopting the operating method, it is possible to reduce the weight and size. In the case of an LRT that requires an ultra-low floor, a regenerative brake or a dynamic braking system that consumes electric energy in the vehicle is often installed in the normal brake, reducing the mechanical braking load. Therefore, it is advantageous to deal with the tread brake unit 34 when there is no space in the installation space. Other configurations and operations are the same as in the case of the bogie 10 described above, and therefore common members are denoted by the same reference numerals and description thereof is omitted.

9A and 9B show another embodiment of the uniaxial truck of the present invention. FIG. 9A is a plan view with the left half omitted, and FIG. 9B is a side view of the same. In this example, the vehicle body 2 and the lateral beam 11d of the bogie frame beam 11 are connected by the radius rod 35 in order to transmit the longitudinal force including the driving force of the uniaxial bogie 10-2 to the vehicle body 2. That is, the horizontal beam 11
Brackets 35a are projected rearward on both sides of d,
The bracket 35b is projected from the vehicle body 2 side toward the front,
Pins 35c and 35d are loosely fitted and connected between the brackets 35a and 35b so that the radius rod 35 is allowed to move left and right relative to each other. A buffer rubber bush such as a bolster may be fitted in the space between the pins 35c and 35d and the brackets 35a and 35b, or a spherical bearing may be loaded instead of the pin.

Further, as shown in FIG. 10, the uniaxial truck 10-2 is provided with a horizontal slot 3 from the central position in the longitudinal direction of the horizontal beam 11d.
A pair of plate members 3 in which a plate member 36 having a hole 6a is provided so as to project rearward and is disposed from the lower surface of the vehicle body 2 via a support pin 37a.
7 and the plate member 36 are integrally bonded to each other via the rubber body 38, and the support pin 37a is loosely fitted in the horizontally elongated hole 36a. With this configuration, relative lateral movement between the vehicle body 2 and the bogie frame beam 11 (bogie 10-2) is allowed, and the lateral vibration transmitted from the wheel 14 to the bogie frame beam 11 via the shaft beam 12 is made of a rubber body. Absorb by shear deformation of 38. Plate 36/37
The same effect can be expected by connecting the vehicle body 2 and the bogie frame beam 11 with a vertical suspension link instead of the rubber body 38. Although illustration is omitted, the suspension link pivotally supports the upper end on the bracket on the vehicle body 2 side and the lower end on the bracket on the bogie frame beam 11 side, so that both upper and lower pivot parts can swing left and right. Constitute.

Further, instead of the rubber body 38, for example, a spherical bearing 54 as shown in FIG. 20 can be used for the front and rear connecting portions of the radius rod 35 and the vertical connecting portions of the suspension links shown in FIG. The spherical bearing 54 is arranged between the vehicle body 2 and the bogie frame beam 11 as shown in FIG. A spherical outer ring body 54b is rotatably mounted around the spherical inner ring body 54a, and the outer ring body 54b is fitted in a mounting hole on the bogie frame beam 11 side via a circlip 54c.
On the other hand, the support pin 54e is inserted by vertically penetrating the through hole 54d at the center of the inner ring body 54a.
The nut 54f is screwed into the threaded portion of and is tightened. A washer 54g is fitted around the support pin 54e so as to sandwich the inner race 54a from above and below. Further, instead of the spherical bearing 54, a universal joint or a connecting member made of an elastic body such as rubber in which vertical cross-section rubber is laminated is used to support in all directions (soft in the lateral direction and relatively hard in other directions). Can be connected by allowing the rocking of the above).

Incidentally, FIG. 11A shows a state in which the pillow spring 21 composed of an air spring contracts and absorbs the vibration transmitted from the wheel 14 via the shaft spring 24. When the rubber body 38 is replaced with the bogie frame beam pin 17, the bogie frame beam 11 swings up and down around the rubber body 38, and the pillow spring 21 expands and contracts to absorb the vibration.
FIG. 11B shows a state in which the shaft beam 12 swings up and down with respect to the bogie frame beam 11. The shaft beam 12 swings up and down around the shaft beam pin 19, and the shaft spring 24 is moved. By expanding and contracting, the vibration from the wheel 14 is absorbed. Other configurations and operations are the same as in the case of the bogie 10 described above, and therefore common members are denoted by the same reference numerals and description thereof is omitted.

FIG. 12 is a side view showing still another embodiment of the present invention. A uniaxial bogie 10-3 of this example is a bogie frame beam 11.
Of the bogie frame beam pin 17 to the vehicle body 2 of
It is inclined downward by 5 °, and a bracket 39 is projected from the upper end of the inclined beam portion 11e as shown in FIG.
A bogie frame beam pin 17 is pivotally attached to a bracket 16 which projects downward from the lower surface of the bogie frame. An electric motor 15 is mounted inside the rear portion of the shaft beam 12, and a wheel 14 is rotatably and rotatably mounted inside the front portion of the shaft beam 12, but the front portion of the shaft beam 12 includes the wheel 14. Bogie frame beam 1
It projects to the front from the other end (front end) side of 1. The support member 12e is inclined downward from the rear end of the shaft beam 12 toward the rear.
Is extended and is axially attached to the bracket 23 of the axial beam 12 by the axial beam pin 19 together with the bracket 22 extended downward and rearward from the casing 15a of the electric motor 15.
The front end side is supported swingably in the vertical direction. A shaft spring 24 is provided between the front end of the bogie frame beam 11 and the shaft beam 12, and a pillow spring 21 is provided between the front end of the bogie frame beam 11 and the vehicle body 2.

The uniaxial truck 10- of the present example having the above-mentioned configuration
As shown in FIG. 12, one of the lower surfaces of the articulated vehicle 3 is completely mounted, and the end 3 of the shaft beam 12 and the wheels 14 are arranged so as to project below the other articulated vehicle. For this reason, the two vehicle bodies 2 are not mounted on the uniaxial bogie 10 in a straddle manner, which is suitable for being installed at a connecting portion. It should be noted that the end portion of the shaft beam 12 and the wheels 14 may be housed in one vehicle and not projected to the other vehicle. Other configurations and operations are the same as in the case of the bogie 10 described above, and therefore common members are denoted by the same reference numerals and description thereof is omitted.

FIG. 15 is a partially cutaway plan view showing another embodiment of the gear train of the gear reducer used in the uniaxial truck of the present invention. The reduction gear train is combined in two stages and the reduction ratio is shown. Is increased and the rotation speed of the electric motor 15 is increased to obtain a high output. 15b in the figure
Is a drive pinion, 30b is a pinion gear unit, 3
0d is an idle gear, and 30c is a final reduction gear.

FIG. 16 is also a partially cutaway plan view showing another embodiment of the gear train of the gear reducer used in the uniaxial truck of the present invention. The reduction gear train is combined in two stages to reduce the reduction ratio. 15 is common to FIG. 15 in that the rotation speed of the electric motor 15 is increased to obtain a high output, but in the case of this example, the distance between the wheel 14 and the electric motor 15 is increased to increase the electric power. The installation space for the motor 15 is increased. In the figure, 15b is a drive pinion, 30b is a pinion gear unit, 30d is an idle gear, and 30 is an idle gear.
c is the final reduction gear. Other configurations and operations are the same as in the case of the bogie 10 described above, and therefore common members are denoted by the same reference numerals and description thereof is omitted.

FIG. 17 is a partially cutaway plan view showing still another embodiment of the speed reducer used in the uniaxial truck of the present invention. In this example, the drive shaft 40 and the bevel gears 41 to 43 are used in combination in place of the gear reducer 30. That is, as shown in the drawing, a large reduction bevel gear 43 is arranged on the output shaft side of the wheel 14 and meshes with the small bevel gear 42. The driving bevel gear 41 of the electric motor 15 is meshed with another small bevel gear 42a, and a shaft 44 rotatable integrally with each bevel gear 42 is rotatably supported in the casing 12a of the shaft beam 12 by a bearing 45. The drive shafts 46 are connected to each other via a coupling 47.

Instead of the gear reducer 30 and the drive shaft 40, a steel belt and a pulley or a chain and a sprocket may be used in combination.

The embodiments of the single-axle bogie of the present invention have been described above. However, the present invention is not limited to low-floor trams, but is applied to general trams with a high floor position and railroad cars designed to be lightweight. It goes without saying that you can do it.

[0066] Further, according to the single truck according to the present invention raised the plurality of embodiments above, to indicate the vibration system of the vehicle 18, it is necessary to reduce the m _0, also m _1,
m ₂ , k ₁ and k ₂ also have appropriate values, and the shaft beam pin 19 and the bogie frame beam pin 17 are brought close to each other and positioned near the electric motor 15 to reduce the weight of m ₀ , and It is possible to include the electric motor 15 in m ₁ or m ₂ . In other words, as shown by the resonance curve in FIG. 19, which represents the riding comfort of the vehicle, m ₁ , m ₂ ,
By setting k ₁ and k ₂ to appropriate values, it is possible to make the vehicle comfortable to ride. Particularly, in the single-axle bogie according to the present invention, as described above, the weight of the motor is not included in the unsprung weight but included in m ₁ or m ₂ depending on the set positions of the shaft beam pin 19 and the bogie frame beam pin 17. Is possible,
You can get good results.

[0067]

As is apparent from the above description,
The uniaxial bogie for railway vehicles according to the present invention has the following excellent effects.

(1) Suitable for a 100% low floor type tram, applicable to an articulated trolley, and has a simple structure and light weight, and an axial beam for steeringally mounting wheels mounted on a track. Part of the weight of the speed reducer and the drive motor mounted on the vehicle can be dispersed and supported by the bogie frame beam or the like between the springs, and the load on the track can be reduced. In addition, even on a steep curved road with a minimum turning radius of 30 m or less, the wheels smoothly turn along the railroad track.

(2) Except that the constituent members of the bogie frame beam with one end open are connected to the lateral beam with high rigidity, and the shaft beam is capable of swinging vertically in the bogie frame beam on the shaft beam pin side. Since it is pivotally supported with high rigidity, and the left and right shaft beams are pivotally connected by a lateral link on the open side of the other end,
The wheels can be held with sufficient rigidity against the lateral load received from the rails via the wheels, and the distance between the wheels can be secured.

(3) The drive motor is provided integrally with the shaft beam, and the shaft beam is swingably connected to the bogie frame beam by a shaft beam pin via a bracket protruding from the casing of the drive motor. By incorporating the speed reducer into the shaft beam with a hollow beam structure and considering the position of the center of gravity of the drive motor and the position of the shaft beam pin, a considerable part of the weight of the drive motor is moved from the shaft beam to the bogie frame beam side. The part that has been transferred and is distributed to the unsprung weight on the shaft beam side is reduced, and part of the shaft beam can be used together with the reducer box, which simplifies the structure and prevents the reducer from being exposed to the outside. It is stored inside.

(4) The bogie frame beam pin is provided on the vehicle body so as to allow relative lateral movement between the car body and the bogie frame beam, and is transmitted from the bogie frame beam to the vehicle body via the bogie frame beam pin. An elastic body is provided around the bogie frame beam pins in order to block vibrations and noise, or one end of the bogie frame beam is swingable in the left and right direction with respect to the vehicle body via an elastic body or a suspension link. By connecting and connecting in the front-rear direction via the radius rod, it is possible to move the uniaxial bogie relative to the vehicle body in the width (left and right) direction. In addition, the elastic body is interposed between the carbody and the uniaxial bogie to allow the vehicle body to move. Lateral vibration of

(5) By connecting the axle of the wheel and the output shaft of the reduction gear so as to be bendable by a constant velocity ball joint in the vicinity of the kingpin, the wheel attached to the shaft beam through the knuckle is centered around the kingpin. When shifting, the driving force from the drive motor is transmitted to the axle by the constant velocity joint while the axle of the wheel placed on the track and traveling and the output shaft of the reduction gear are bent, and the vertical movement of the axle beam The movement is smooth.

(6) The left and right steering knuckle arms are pivotally connected by tie rods with an inclination angle so that the wheels on the inner gauge side are steered more than the wheels on the outer gauge side. Since the rotation angle (steering angle) of the track almost matches the curvature of the track on the curved part and a large pressing force is prevented from acting on the outer track side, it turns smoothly along the curved part of the track. .

(7) One end of the bogie frame beam is connected to the lower end of one end of the bogie frame beam through an axial beam pin arranged substantially directly below the bogie frame beam pin so that one end of the shaft beam can swing vertically in the other end side. Then, the other end of the shaft beam is projected outward from the other end of the bogie frame beam, and the wheel is steerably attached to the other end of the shaft beam so that one of the shaft beams is connected near the connecting point of the connecting vehicle. It becomes possible to completely mount the above vehicle on a single-axle bogie and the interference with the other vehicle is unlikely to occur, and therefore it is most suitable to be arranged at the connecting point of the connected vehicle.

(8) By omitting the bogie frame beam and providing the axial beam on the vehicle body with the above-described structure, substantially the same effects as described above are produced, the structure is simplified, and the size and weight can be easily reduced. .

[Brief description of drawings]

FIG. 1 is a perspective view of a uniaxial truck 10 according to an embodiment of the present invention.
It is a side view showing a 0% low floor type two-car train articulated vehicle.

FIG. 2 is a diagram showing a uniaxial truck 10 according to an embodiment of the present invention.
It is a side view which shows a 0% low floor type single vehicle.

FIG. 3 is a side view showing an articulated vehicle of a partially low floor type two-car train in which a single-axle bogie according to an embodiment of the present invention is applied to a continuously installed location.

FIG. 4 shows a uniaxial bogie 10 arranged at the right end of the vehicle of FIGS. 1 and 2 according to an embodiment of the present invention. FIG. 4 (a) is an enlarged plan view in which the right half is omitted. b) is a left side view.

5 (a) is a front view of FIG. 4 (a), and FIG.
FIG. 5B is a plan view showing a state in which the wheels of the uniaxial truck of FIG. 5A are steered in the left-right direction, and the bogie frame beam and the lateral beam are omitted.

6 (a) is an enlarged sectional view showing the bogie frame beam pin portion of FIG. 4 (a), and FIG. 6 (b) shows a state in which the vehicle body 2 is laterally moved by s with respect to the bogie 10. It is an enlarged plan view which abbreviate | omitted the right half shown. FIG. 6C is a sectional view showing another embodiment of the vibration-proof rubber.

FIG. 7 (a) is a bogie frame beam 11 and an axial beam 12
7 is a side view showing a state in which the front end side of the vehicle swings upward, FIG.
FIG. 3B is a side view showing a state in which the front end portion side of the bogie frame beam 11 swings upward with respect to the vehicle body 2.

FIG. 8 is a uniaxial truck 10-1 according to another embodiment of the present invention.
FIG. 3 is an enlarged plan view showing the right half of FIG.

FIG. 9 is a uniaxial truck 10-2 according to a third embodiment of the present invention.
9A is an enlarged plan view in which the right half is omitted, and FIG. 9B is a left side view of the same.

10 (a) is an enlarged plan view showing the state in which the vehicle body 2 is laterally moved by s with respect to the uniaxial bogie 10-2, with the right half omitted, and FIG. 10 (b) is A of FIG. 10 (a). It is an expanded sectional view seen from the direction.

11 (a) is a side view showing a state in which a front end side of a shaft beam 12 is swung upward with respect to a bogie frame beam 11, FIG.
1 (b) is a side view showing a state in which the front end side of the bogie frame beam 11 swings upward with respect to the vehicle body 2.

FIG. 12 is a uniaxial truck 10-according to a fourth embodiment of the present invention.
It is a left side view showing 3.

FIG. 13: Uniaxial trucks 10 to 1 according to each embodiment of the present invention
It is sectional drawing which expands and shows the relationship of the wheel 14, knuckle 28, and reduction gear 30 used for 0-3.

FIG. 14 is a partially cutaway plan view showing an embodiment of a gear train of a gear reducer used for the uniaxial truck 10 or the like of the present invention.

FIG. 15 is a partially cutaway plan view showing another embodiment of the gear train of the gear reducer used for the uniaxial truck 10 or the like of the present invention.

FIG. 16 is a partially cutaway plan view showing another embodiment of the gear train of the gear reducer used in the uniaxial truck 10 or the like of the present invention.

FIG. 17 is a partially cutaway plan view showing still another embodiment of the gear train of the gear reducer used for the uniaxial truck 10 or the like of the present invention.

FIG. 18 is a schematic diagram showing a vibration system of a railway vehicle.

FIG. 19 is a resonance curve showing the riding comfort of a railway vehicle.

20 shows an example of a spherical bearing 54, and FIG.
20A is an enlarged sectional view taken along line aa of FIG.
(B) is an enlarged plan view with the right half omitted.

21 (a) and 21 (b) are cross-sectional views showing a bendable drive force transmission joint 33 ', and FIG.
21B is a sectional view taken along the line aa in FIG. 21B, and FIG.
3 is a cross-sectional view taken along line bb of FIG.

22 (a) and 22 (b) are sectional views showing a bendable driving force transmission joint 33 ″ according to another embodiment.
22A shows a normal state, and FIG. 22B shows a bent normal state.

FIG. 23 is a cross-sectional view showing a constant velocity ball joint 33 which is one of bendable drive force transmission joints.

[Explanation of symbols]

1,1 ', 1 "tram 2 car body 3 floor 9 rails 10-10-3 Uni-axle dolly 11 bogie frame beam 12 axis beam 13 bearings 14 wheels 15 Electric motor for driving 17 bogie frame beam 19 axis beam pin 20 ・ 20 'Rolled anti-vibration rubber 21 pillow spring 24 shaft spring 30 reducer

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shuji Akashi             2-1-1 Wadayama-dori, Hyogo-ku, Kobe-shi, Hyogo             Kawasaki Heavy Industries, Ltd. Hyogo Factory (72) Inventor Junichi Terai             2-1-1 Wadayama-dori, Hyogo-ku, Kobe-shi, Hyogo             Kawasaki Heavy Industries, Ltd. Hyogo Factory (72) Inventor Shinya Matsuki             2-1-1 Wadayama-dori, Hyogo-ku, Kobe-shi, Hyogo             Kawasaki Heavy Industries, Ltd. Hyogo Factory (72) Inventor Yasumasa Oku             2-1-1 Wadayama-dori, Hyogo-ku, Kobe-shi, Hyogo             Kawasaki Heavy Industries, Ltd. Hyogo Factory (72) Inventor Koji Kadota             1-1 Kawasaki-cho, Akashi-shi, Hyogo Kawasaki Heavy Industries             Akashi Factory Co., Ltd. (72) Inventor Yukinobu Kono             1-1 Kawasaki-cho, Akashi-shi, Hyogo Kawasaki Heavy Industries             Akashi Factory Co., Ltd. (72) Inventor Hirohide Matsushima             1-1 Kawasaki-cho, Akashi-shi, Hyogo Kawasaki Heavy Industries             Akashi Factory Co., Ltd. (72) Inventor Hideaki Ezaki             1-1 Kawasaki-cho, Akashi-shi, Hyogo Kawasaki Heavy Industries             Akashi Factory Co., Ltd. (72) Inventor Noboru Kobayashi             2-12-14 Wadayama-dori, Hyogo-ku, Kobe-shi, Hyogo             No. Kawaju Vehicle Engineering Co., Ltd.

Claims (10)

[Claims] 1. A bogie frame beam having a side beam portion, one end of each side of which is connected to a bottom surface of a vehicle body via a bogie frame beam pin so that the other end can swing in the vertical direction. An elastic body such as an air spring is interposed between the end portions, and a pair of left and right shaft beams is arranged below the bogie frame beam substantially parallel to the side beam portion, and the bogie frame beam pin side of the bogie frame beam is disposed. One end of each of the shaft beams is connected to the end of each of the shaft beams via a shaft beam pin so that the other end can swing vertically, and an elastic body such as a shaft spring is provided between the other end of the bogie frame beam and the shaft beam. A uniaxial bogie for a railway vehicle, characterized in that a wheel rotatably supported by a bearing on each shaft beam is rotatably mounted around a kingpin via a knuckle. 2. A bogie frame beam having a side beam portion, one end of each side of which is connected to the bottom surface of the vehicle body via bogie frame beam pins so that the other end can swing in the vertical direction. An elastic body such as an air spring is interposed between the end portions, and a pair of left and right shaft beams is arranged below the bogie frame beam substantially parallel to the side beam portion, and the bogie frame beam pin side of the bogie frame beam is disposed. One end of each shaft beam is connected to the end of the shaft beam via a shaft beam pin so that the other end can swing vertically, and an elastic body such as a shaft spring is provided between the other end of the bogie frame beam and the shaft beam. A shaft rotatably supported by bearings on each shaft beam so as to be steerable around a kingpin via a knuckle, and a drive motor is provided on the shaft beam pin side of each shaft beam. The motor is connected to the wheels via a speed reducer installed in the shaft beam. A uniaxial bogie for railway vehicles. 3. The bogie frame beam hangs down on the bogie frame beam pin side and integrally connects both sides of the hanging part with a lateral beam, and the shaft beam laterally links ends on the side opposite to the shaft beam pin. The uniaxial bogie for a railway vehicle according to claim 1 or 2, which is pivotally connected by means of. 4. The drive motor is integrally provided on the shaft beam, and the shaft beam is swingable with respect to the bogie frame beam by the shaft beam pin via a bracket projecting from a casing of the drive motor. The single-axle bogie for a railway vehicle according to claim 2 or 3, which is connected to the shaft beam so that the shaft beam has a hollow structure and the speed reducer is incorporated in the shaft beam. 5. The bogie frame beam pin to the vehicle body,
It is provided to allow relative lateral movement between the vehicle body and the bogie frame beam, and an elastic body is restrained around the bogie frame beam pin when the vehicle body and bogie frame beam are laterally moved relative to each other. The uniaxial bogie for railway vehicles according to any one of claims 1 to 4, wherein the uniaxial bogie for railway vehicles is provided. 6. One end of the bogie frame beam (on the bogie frame beam pin side) is swingably connected to the vehicle body in the left-right direction via an elastic body or a suspension link, and also in the front-rear direction via a radius rod. The uniaxial truck for railway vehicles according to any one of claims 1 to 4, which is connected. 7. The shaft of the wheel and the output shaft of the speed reducer are connected by a bendable power transmission shaft coupling such as a constant velocity ball joint near the kingpin. Uniaxial bogie for railway vehicles. 8. Steering arms are extended forward from the left and right knuckles, and are pivotally connected by tie rods with an inclination angle so that the wheels on the inner gauge side are steered more than the wheels on the outer gauge side. The uniaxial bogie for railway vehicles according to any one of claims 1 to 7. 9. The one end of the bogie frame beam is connected to the one end lower end of the bogie frame beam through an axial beam pin arranged substantially directly below the bogie frame beam pin so that one end of the shaft beam can swing vertically in the other end side. Then, the other end of the shaft beam is projected outward from the other end of the bogie frame beam, and the wheel is steerably attached to the other end of the shaft beam. Uniaxial bogie for railway vehicles. 10. One end portion of a pair of left and right shaft beams is connected to the bottom surface of the vehicle body via shaft beam pins such that the other end side can swing vertically, and the other end side of each shaft beam and the vehicle body are connected. An elastic body such as a shaft spring is interposed between the shaft beams, and the wheels rotatably supported by bearings are mounted on the shaft beams so as to be steerable around a kingpin through a knuckle. A uniaxial bogie for a railway vehicle, wherein a drive motor is provided on the pin side and the motor is connected to the wheels via a speed reducer installed in the shaft beam.