CN111196288B

CN111196288B - Bogie and rail vehicle

Info

Publication number: CN111196288B
Application number: CN201811374011.0A
Authority: CN
Inventors: 赵锋; 霍文彪; 金静飞; 张秀纯; 郝涛广; 常莉君
Original assignee: CRRC Tangshan Co Ltd
Current assignee: CRRC Tangshan Co Ltd
Priority date: 2018-11-19
Filing date: 2018-11-19
Publication date: 2021-03-19
Anticipated expiration: 2038-11-19
Also published as: CN111196288A

Abstract

The embodiment of the application provides a bogie and rail vehicle, wherein, the bogie includes: an axle; two ends of the axle are symmetrically provided with shaft necks; a wheel coupled to the journal by a bearing; the buffer device is arranged in the middle of the axle; the top of the buffer device is used for being connected with a vehicle body. The bogie and the rail vehicle provided by the embodiment of the application can improve the flexibility of the vehicle in the turning process.

Description

Bogie and rail vehicle

Technical Field

The application relates to a vehicle steering technology, in particular to a bogie and a rail vehicle.

Background

Rail vehicles are important traffic ties connecting cities, and are gradually becoming main vehicles in cities, and rail vehicles are also main carriers of goods transportation. At least two bogies are arranged below the vehicle body of the railway vehicle and used for bearing the vehicle body and realizing walking and steering functions.

In the related art, a bogie includes: the wheel set comprises frameworks, wheel sets and a buffer device, wherein two groups of wheel sets are symmetrically arranged below each framework along the longitudinal direction, and each wheel set comprises an axle and wheels symmetrically arranged at two ends of the axle. The wheels are in contact with the track and are pressed by the track to drive the bogie and the vehicle body to turn. The buffer device is arranged between the framework and the vehicle body and used for reducing the vibration of the vehicle body. The bogie is large in size, heavy and poor in flexibility in the turning process.

Disclosure of Invention

The embodiment of the application provides a bogie and a rail vehicle, which can improve the flexibility of the vehicle in the turning process.

An embodiment of a first aspect of the present application provides a bogie, including:

an axle; two ends of the axle are symmetrically provided with shaft necks;

a wheel coupled to the journal by a bearing;

the buffer device is arranged in the middle of the axle; the top of the buffer device is used for being connected with a vehicle body.

An embodiment of a second aspect of the present application provides a rail vehicle, including: a bogie as described above.

According to the technical scheme provided by the embodiment, the shaft necks are symmetrically arranged at the two ends of the axle, and the wheels are connected with the shaft necks through the bearings, so that the axle is immovable, and the wheels rotate; and a buffer device is arranged in the middle of the axle, and the top of the buffer device is used for being connected with the vehicle body so as to buffer the vibration of the bogie. The bogie provided by the embodiment is provided with only one set of wheel pairs, including one axle and wheels arranged at two ends of the axle, and can realize the basic functions of the bogie, namely: carrying, walking and steering. Compared with the traditional bogie, the bogie provided by the embodiment has smaller turning radius, has greater advantage in curve passing capacity, is particularly applied to rail transit in cities, and reduces the difficulty of track circuit layout.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1 is a schematic structural diagram of a bogie according to a first embodiment of the present application;

FIG. 2 is an exploded view of a truck according to an embodiment of the present disclosure, wherein wheels are connected to axles;

fig. 3 is a schematic structural diagram of an axle in a bogie according to a second embodiment of the present application;

fig. 4 is a schematic structural diagram of a bogie provided in the second embodiment of the present application;

FIG. 5 is an exploded view of an axle coupled to a cushioning device according to a fourth embodiment of the present application;

fig. 6 is a schematic structural diagram of a tie spring support plate according to a fourth embodiment of the present application;

fig. 7 is a schematic structural diagram of a secondary spring supporting plate according to a fourth embodiment of the present application;

fig. 8 is a partial cross-sectional view of the assembly of the two spring brackets and the gudgeon in accordance with the fourth embodiment of the present invention.

Reference numerals:

1-an axle; 11-a journal; 12-a shaft body; 121-shaft body connecting part; 13-a shaft head; 131-a spindle nose connection; 132-a tie spring mount; 133-two tie spring mount; 1331-oblong holes;

2-vehicle wheels; 21-a hub;

3-a buffer device; 31-a tie spring support plate; 311-first mounting hole; 32-a tie elastic member; 321-a spring mounting portion; 33-a secondary spring support plate; 331-a second mounting hole; 332-a guide block; 333-guide clamp; 3331-a clamping part; 34-a secondary elastic member; 35-a slewing ring; 351-an accommodation hole; 352-baffle ring;

4-a bearing;

5-a drive device;

6, a brake disc; 61-a tray body; 62-disk connections; 63-a disk body mounting portion;

7-a vehicle body; 71-traction block.

Detailed Description

In order to make the technical solutions and advantages of the embodiments of the present application more apparent, the following further detailed description of the exemplary embodiments of the present application with reference to the accompanying drawings makes it clear that the described embodiments are only a part of the embodiments of the present application, and are not exhaustive of all embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

Example one

The embodiment provides a bogie which can be used on a railway vehicle. The bogie has high flexibility in the turning process.

Fig. 1 is a schematic structural diagram of a bogie provided in a first embodiment of the present application, and fig. 2 is an exploded view of a bogie provided in the first embodiment of the present application, in which wheels are connected to axles. As shown in fig. 1 and 2, the present embodiment provides a bogie including: an axle 1, wheels 2 and a damping device 3. Wherein, the axle 1 is provided with journals 11 at both ends, and the wheels 2 are connected with the journals 11 through bearings 4. Namely: the axle 1, the axle journal 11 are stationary, while the wheel 2 is able to rotate relative to the axle journal 11.

The buffer device 3 is arranged in the middle of the axle 1, and the top of the buffer device 3 is used for being connected with a vehicle body. The damper 3 can bear the weight of the vehicle body and damp the vibration of the wheel 2, thereby preventing a large amount of vibration from being transmitted to the vehicle body.

In traditional bogie, be provided with two sets of wheel pairs on the framework, including four wheels, the turning radius of this bogie is great, the certain degree of difficulty that causes the overall arrangement of track circuit. In the technical solution provided in this embodiment, the bogie provided in this embodiment is provided with only one set of wheel pairs, including one axle 1 and wheels 2 disposed at two ends of the axle 1, and can realize the basic functions of the bogie, that is: carrying, walking and steering. Compared with the traditional bogie, the bogie provided by the embodiment has smaller turning radius, has greater advantage in curve passing capacity, is particularly applied to rail transit in cities, and reduces the difficulty of track circuit layout.

Moreover, the bogie that has a set of wheel pair that this embodiment provided, on the one hand, the quantity of wheel and axletree has been few, and the holistic weight of bogie has alleviateed greatly, can alleviate rail vehicle's dead weight, reduces the energy consumption. On the other hand, the number of wheels is reduced by times, so that the number of wheel rail contact points is greatly reduced, the input of vibration and noise is further reduced, and the stability and the comfort degree of a vehicle body are improved; but also can reduce the damage to the track caused by the friction of the wheel track. On the other hand, the bogie adopting the set of wheel sets is simple in structure, convenient to install and maintain and capable of improving production efficiency.

Example two

In the present embodiment, on the basis of the above-described embodiments, the implementation of the bogie is optimized, and in particular, the implementation of the axle 1 is further optimized.

The axle 1 may be a straight axle, that is: the central line of the middle part of the axle 1 is coincident with the central lines of the shaft journals 11 at the two ends. Alternatively, the structure shown in fig. 1 and 2 may be adopted, and the middle part of the axle 1 is recessed downward to form an accommodating space for accommodating the buffer device 3, so that the vertical height of the buffer device 3 can be reduced, and the height of the vehicle body floor can be reduced.

Specifically, fig. 3 is a schematic structural diagram of an axle in a bogie according to a second embodiment of the present application. As shown in fig. 1 to 3, the axle 1 includes: a shaft body 12 and a shaft head 13. Wherein, the number of the spindle nose 13 is two, and the spindle nose is respectively arranged at two ends of the spindle body 12. The vertical height of the shaft body 12 is lower, the shaft head 13 extends along the vertical direction approximately, the bottom end of the shaft head 13 is connected with the shaft body 12, the shaft neck 11 is arranged on the outer side surface of the top end of the shaft head 13, and the axial height of the shaft neck 11 is equivalent to the vertical height of the shaft body 12. The axle body 12 and the axle heads 13 at the two ends enclose an accommodating space, and the buffer device 3 is arranged in the accommodating space.

The axle body 12 and the axle head 13 may be an integral structure, or the axle body 12 and the axle head 13 may be two independent components, and the two components are connected together by welding, screwing and the like. In this embodiment, the bottom end of the spindle head 13 is provided with a spindle head connecting portion 131, the spindle body 12 is correspondingly provided with a spindle body connecting portion 121, and the spindle head connecting portion 131 is in butt joint with the spindle body connecting portion 121 and is connected with the spindle body connecting portion 121 through a bolt.

In fig. 2, a wheel hub 21 is fixedly arranged on the wheel 2, the wheel hub 21 is in clearance fit with an outer ring of the bearing 4, a bearing retainer ring (not shown in the figure) is arranged on the wheel hub 21, and an inner ring of the bearing 4 is in interference fit with the shaft neck 11, so that the wheel 2 and the axle 1 are assembled.

The journal 11 and the stub shaft 13 may be of unitary construction, or they may be connected by interference fit.

The bogie can be used as a trailer bogie (also called a non-power bogie), namely: the bogie is not provided with a driving device, and wheels in the bogie roll along with the movement of the vehicle body.

Alternatively, fig. 4 is a schematic structural diagram of a bogie provided in the second embodiment of the present application. As shown in fig. 4, a driving device 5 connected to the wheels 2 is provided on the bogie for driving the wheels 2 to rotate, so that the bogie can be used as a railcar bogie.

Specifically, the driving device 5 includes: a drive motor, the housing of which can be fitted on the axle 1, and a reduction gear. One end of the speed reducer is connected with the output end of the driving motor, and the other end of the speed reducer is connected with the wheel 2. The drive motor and the speed reducer may be integrally provided in one housing.

There are several possible ways of realisation between the reducer and the wheel 2: for example: the output end of the speed reducer is connected with the wheel 2 through a connecting shaft, for example, the output end of the speed reducer can be in interference fit with a shaft hole of the wheel 2, and can also be in fit through a key or a spline. Or, a hub 21 is arranged in the shaft hole of the wheel 2, and the connecting shaft and the hub 21 are in interference fit or are in fit through a key.

EXAMPLE III

The embodiment is based on the above embodiments, and optimizes the implementation manner of the bogie, especially further optimizes the braking manner.

For a trailer bogie, the braking device may be used to brake the wheels 2 in a variety of ways, for example: the braking is realized by pressing a brake clamp on a wheel disc of the wheel 2 from two sides, or the braking is realized by pressing a brake shoe on a tread of the wheel 2. Alternatively, the following implementation may also be adopted:

as shown in fig. 1 and 2, the braking device includes: a brake disc 6 and a brake caliper (not shown) which can be mounted on the axle 1 by means of a mounting. Wherein the brake disc 6 is connected to the wheel 2 for synchronous rotation with the wheel 2. The brake caliper is used to clamp the disc surface of the brake disc 6 from both sides during braking to prevent the brake disc 6 from rotating. The brake caliper can be implemented as known in the art, and the embodiment will not be described in detail.

The way in which the brake disc 6 is connected to the wheel 2 can be varied, for example: the brake disc 6 is connected with the wheel 2 in an interference fit mode through a connecting shaft or in a bolt connection mode. The embodiment provides a specific implementation manner:

the brake disk 6 includes: brake disc 61 and disc connection 62. Wherein, one end of the disc body connecting piece 62 along the axial direction is connected with the brake disc body 61, and the other end is connected with the wheel disc of the wheel 2 through a bolt. Specifically, the disk body connecting member 62 may also be sleeved outside the hub 21 and be in interference fit with the hub 21. The disk body connecting piece 62 extends outward in the radial direction toward the end of the wheel 2 to form a disk body mounting portion 63, and the disk body mounting portion 63 is provided with bolt holes and is correspondingly connected to a wheel disk of the wheel 2 through bolts.

The power bogie with the driving device may be braked by a tread surface brake, or may be braked by reversing the driving motor.

The number of the braking devices is two, and the two braking devices are symmetrically arranged at two ends of the bogie.

Example four

In the present embodiment, on the basis of the above-described embodiments, the implementation of the bogie, in particular, the implementation of the buffer device 3, is optimized.

Fig. 5 is an exploded view of an axle and a shock absorber according to a fourth embodiment of the present invention. As shown in fig. 1 and 5, the buffering device includes: a spring tying component, two spring tying components and a rotary ring. Wherein one tying spring assembly is arranged on the axle 1 and two tying spring assemblies are arranged on the top of the one tying spring assembly. The slewing ring is arranged on the top of the two spring assemblies and is used for being connected with a vehicle body so as to transmit traction force or braking force between the vehicle body and the bogie. The first and second spring assemblies serve to damp vibrations of the axle 1 and the wheel 2 to reduce vibrations of the vehicle body.

The embodiment provides a specific implementation manner of the tie spring assembly, and a person skilled in the art can directly adopt the technical scheme provided by the embodiment, and can also make appropriate modifications on the basis of the technical scheme provided by the embodiment, so that the tie spring assembly is suitable for vehicle bodies with different structures or bearing capacities.

As shown in fig. 5, the spring tying assembly specifically includes: a spring supporting plate 31 and an elastic member 32. Wherein, the number of the first elastic members 32 is two, and the two elastic members are symmetrically arranged at two ends of the first spring supporting plate 31. A tie spring 32 is connected between a tie spring bracket 31 and the stub shaft 13. The spring supporting plate 31 is suspended above the axle body 12, and two ends of the spring supporting plate 31 are connected to the axle head 13 through the elastic members 32, so that the axle body 12 is stressed more uniformly, and stress concentration is reduced.

The elastic force of a tie spring 32 can damp the vibration of the axle 1, and avoid a tie spring support plate 31 from generating large vibration. In particular, the method comprises the following steps of,

fig. 6 is a schematic structural diagram of a spring supporting plate according to a fourth embodiment of the present application. As shown in fig. 6, a series of elastic members 32 is an elastically deformable structure, such as: the steel, carbon fiber composite or other materials are made into a plate-shaped structure, one end of the plate-shaped structure is connected with a spring supporting plate 31, and the other end of the plate-shaped structure is connected with the shaft head 13. A resilient member 32 is capable of bending and deforming when subjected to a force and capable of returning to its original shape when the force is removed. When the axle 1 vibrates up and down to drive the end connected with the elastic member 32 to move up and down, the elastic member 32 deforms to accumulate elastic potential energy, so as to buffer the vibration amount and reduce the vibration of the spring bearing plate 31.

For the connection of a elastic element 32 to the stub shaft 13, for example, the following can be used:

as shown in fig. 3 and 5, a tie spring mounting seat 132 is provided on the inner side surface of the stub shaft 13. A tying spring mounting portion 321 is provided at an end portion of the tying elastic member 32 facing the axle head 13, and a tying spring mounting portion 321 is connected to a tying spring mounting seat 132 by welding or screwing.

Further, as shown in fig. 5, a series of elastic members 32 is not a planar structure but a curved step-like structure. The vertical mounting height of the end portion of the elastic member 32 for connecting with the spring supporting plate 31 is lower than that of the end portion of the elastic member 32 for connecting with the axle head 13, so that the vertical height of the spring supporting plate 31 is lower than that of the spring mounting seat 132.

The two elastic members 32 are symmetrically arranged and connected with the shaft head 13 in the same way.

In addition to the above, a tie spring assembly may also be implemented in other ways, such as: the spring support plate 31 has two ends extending to the axle head 13, the spring 32 is connected between the spring support plate 31 and the spring mounting seat 132, and the spring 32 can elastically deform in the vertical direction and also can buffer the vibration of the axle 1.

The embodiment further provides a specific implementation manner of the dual-spring assembly, and a person skilled in the art can directly adopt the technical scheme provided by the embodiment, and can also make appropriate modifications on the basis of the technical scheme provided by the embodiment, so that the dual-spring assembly is suitable for vehicle bodies with different structures or bearing capacities.

As shown in fig. 5, the second tie spring assembly includes: two spring supporting plates 33 and two elastic members 34. Wherein, the two-series spring supporting plate 33 is located above the axle body 12, and two ends of the two-series spring supporting plate 33 are respectively connected with the axle heads 13 at two sides. The two-spring-set member 34 is disposed between the two-spring-set support plate 33 and the one-spring-set support plate 31. The swivel ring 35 is disposed on top of the spring retainer 33.

The elastic force of the secondary elastic member 34 itself can buffer the vibration of the primary spring assembly, further reducing the vibration amount of the vehicle body.

The secondary elastic member 34 may be a rubber buffer, an air spring, etc., and the air spring is used as the secondary elastic member 34 in this embodiment. The two ends of the air spring along the center line of the air spring are respectively connected with a series spring supporting plate 31 and a series spring supporting plate 33.

Specifically, as shown in fig. 6, a first mounting hole 311 is formed in the first spring supporting plate 31, and a mounting structure that can be accommodated in the first mounting hole 311 is provided at the bottom of the air spring. During assembly, the mounting structure at the bottom of the air spring is inserted into the first mounting hole 311, and the first mounting hole 311 can limit the air spring from moving laterally.

Fig. 7 is a schematic structural diagram of a two-spring supporting plate according to the fourth embodiment of the present application. As shown in fig. 7, the two tie spring support plates 33 are provided with two second mounting holes 331. The top of the air spring is provided with a mounting structure that can be received in the second mounting hole 331. During assembly, the mounting structure on the top of the air spring is inserted into the second mounting hole 331, and the second mounting hole 331 can limit the air spring from moving laterally.

Furthermore, the secondary spring supporting plate 33 can also move along the vertical direction relative to the axle 1, so that when the axle 1 moves up and down, the secondary spring supporting plate 33 cannot be driven to move up and down, and the vibration of the vehicle body is further reduced.

The manner of moving the two-spring supporting plate 33 in the vertical direction can be implemented in many ways, for example: as shown in fig. 3 and 5, the two tie spring mounting seats 133 are provided on the inner side surfaces of the spindle heads 13, and the two tie spring mounting seats 133 are located above the one tie spring mounting seat 132. Correspondingly, two tie spring mounting portions are symmetrically disposed at both ends of the two tie spring support plates 33, and the two tie spring mounting portions are connected to the two tie spring mounting seats 133 and can move in the vertical direction with respect to the two tie spring mounting seats 133.

Specifically, fig. 8 is a partial sectional view of the assembly of the spring bracket and the axle head according to the fourth embodiment of the present invention. As shown in fig. 5, 7 and 8, the two tie-spring mounting seats 133 are provided with oblong holes 1331 extending in the vertical direction. The two spring mounting portions include a guide block 332 and a guide clip 333, wherein the guide block 332 is accommodated in the elongated hole 1331 and is capable of moving in the vertical direction within the elongated hole 1331. One end of the guide clip 333 is connected to the second tied spring support plate 33, and the other end branches into two clamping portions 3331, and the distance between the two clamping portions 3331 is greater than the thickness of the second tied spring mounting seat 133. The two clamping portions 3331 are connected to the guide block 332 from both sides of the guide block 332, respectively. The above-mentioned assembling manner realizes that the two-series spring supporting plate 33 is connected with the shaft head 13 and can move in the vertical direction relative to the shaft head 13.

The clamping portion 3331 and the guide block 332 may be fixed by welding or may be fixed by bolting. Alternatively, the two clamping portions 3331 may be symmetrically provided with receiving grooves, the shapes and the sizes of the receiving grooves are matched with those of the guide block 331, both sides of the guide block 331 are embedded in the receiving grooves, and the distance between the bottom surfaces of the two receiving grooves is approximately equal to the thickness of the guide block, so that the two clamping portions 3331 can limit the guide block 331 in the oblong hole 1331.

Besides the above scheme, the two-spring supporting plate 33 and the axle head 13 can be matched by a sliding block and a sliding rail, a sliding block and a sliding groove, and the like, so that the two-spring supporting plate 33 can move in the vertical direction relative to the axle head 13.

When the vehicle body is fitted over the bogie, the weight of the vehicle body is loaded on the two tie spring support plates 33, and the two tie spring support plates 33 move downward. The weight of the vehicle body is distributed to the secondary elastic members 34 through the secondary spring support plates 33. The secondary elastic member 34 damps and damps the vibration of the axle 1, thereby reducing the vibration of the vehicle body.

Furthermore, the wheel 2 is an elastic wheel, so that vibration and impact transmitted from a wheel rail can be isolated and alleviated, and noise generated by wheel rail impact is reduced.

In addition to the above technical solution, if an air spring is used as the secondary elastic member 34, the axle body 12 may be further configured to be hollow, and used as an additional air chamber of the air spring. Specifically, a cavity in the middle of the shaft body 12 is used as an air chamber, and a vent hole communicated with the air chamber is formed in the top of the shaft body 12. A vent pipeline communicated with the inner cavity of the air spring is correspondingly arranged at the bottom of the air spring and penetrates downwards through a spring supporting plate 31 to be communicated with a vent hole. By connecting the air chamber of the axle body 12 to the inner chamber of the air spring, the axle body 12 can be used as an additional air chamber to adjust the pressure of the air spring.

As for the implementation manner of the swivel ring 35, various manners can be adopted, and this embodiment provides a specific implementation manner, as shown in fig. 5, a receiving hole 351 is provided on the swivel ring 35, a pulling block 71 is provided on the bottom surface of the vehicle body 7, and the pulling block 71 can be inserted into the receiving hole 351. When the bogie moves longitudinally, traction force is applied to the traction block 71 through the slewing ring 35, and then the vehicle body is driven to move longitudinally; alternatively, the slewing ring 35 may apply a braking force to the traction block 71 to restrain the vehicle body from moving.

Further, a stopper ring 352 is provided on the top surface of the swivel ring 35, the stopper ring 352 being coaxial with the receiving hole 351, and the inner diameter of the stopper ring 352 being the same as the diameter of the receiving hole 351. The stop ring 352 protrudes from the top surface of the revolving ring 35, which is equivalent to increase the limit height of the traction block 71 in the vertical direction, so as to prevent the traction block 71 from coming out of the revolving ring 35. The traction block 7 and the slewing ring 35 can rotate relatively, so that the vehicle can turn smoothly.

According to the technical scheme, the first series spring assembly and the second series spring assembly are arranged right above the shaft body 12, and through twice buffering and vibration reduction, the vibration quantity transmitted from the wheel rail to the vehicle body is reduced, and the passenger riding comfort degree can be improved. And the vertical height of the axle body 12 is set to be lower than the central line of the wheels 2, so that the overall height of the bogie is effectively reduced, the height of the corresponding vehicle body bottom plate above the bogie can be reduced, and the space inside the vehicle body is also increased.

EXAMPLE five

The present embodiment provides a rail vehicle, including: a bogie as provided in any one of the embodiments above.

In the description of the present application, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be considered as limiting the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically connected, electrically connected or can communicate with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims

1. A bogie, comprising:

an axle; two ends of the axle are symmetrically provided with shaft necks;

a wheel coupled to the journal by a bearing;

the buffer device is arranged in the middle of the axle; the top of the buffer device is connected with the vehicle body; the middle part of the axle is downwards sunken to form an accommodating space for accommodating the buffer device;

the buffer device includes:

a tie spring assembly disposed on the axle;

two tie spring components, which are arranged on the top of one tie spring component; the secondary spring assembly comprises a secondary spring supporting plate and a secondary elastic member, two ends of the secondary spring supporting plate are respectively connected with the axle, and the secondary elastic member is arranged between the secondary spring supporting plate and the primary spring assembly;

and the revolving ring is arranged at the top of the two series spring supporting plates and is used for being connected with the vehicle body.

2. The truck of claim 1, wherein the axle comprises:

a shaft body;

a shaft head; the number of the shaft heads is two, the two shaft heads are respectively arranged at two ends of the shaft body and form the accommodating space with the shaft body in an enclosing manner; the shaft neck is arranged on the outer side surface of the top end of the shaft head.

3. The bogie of claim 2, wherein the axle head is provided with an axle head connection; the shaft body is provided with a shaft body connecting part; the shaft head connecting part and the shaft body connecting part are connected through a bolt.

4. The bogie of claim 1, further comprising:

and the driving device is connected with the wheels and is used for driving the wheels to rotate.

5. The bogie of claim 4, wherein the drive arrangement comprises:

a drive motor;

a speed reducer; one end of the speed reducer is connected with an output shaft of the driving motor, and the other end of the speed reducer is connected with the wheel.

6. The bogie of claim 1, further comprising:

and the braking device is used for braking the wheels.

7. The truck of claim 6, wherein the braking device comprises:

a brake disc connected to the wheel for synchronous rotation therewith;

and the brake clamp is used for clamping the disc surface of the brake disc from two sides during braking so as to prevent the brake disc from rotating.

8. The truck of claim 7, wherein the brake disc comprises:

a brake disc body;

and one end of the disc body connecting piece is connected with the brake disc body, and the other end of the disc body connecting piece is connected with the wheel disc of the wheel through a bolt.

9. A rail vehicle, comprising: a bogie as claimed in any one of claims 1 to 8.