Bogies and rail vehicles

Abstract

This invention relates to the field of rail vehicle technology, and provides a bogie and a rail vehicle. The bogie includes a frame and a central traction device. The frame includes a load-bearing body and two leaf springs. A center pin channel is formed in the middle of the load-bearing body. Two mounting channels are formed along the longitudinal direction of the frame, and the two leaf springs are respectively mounted in the two mounting channels. The central traction device is mounted in the center pin channel. The central traction device includes a traction beam, a pin sleeve, a center pin, and a connecting rod. The traction beam has an assembly channel along the height direction, and a connecting part is formed on the outer surface of the traction beam. The pin sleeve is mounted in the assembly channel. The pin sleeve has a pin hole and two free clearances along the height direction. Along the width direction of the rail vehicle, the two free clearances are located on both sides of the pin hole. The center pin is mounted in the pin hole. One end of the connecting rod is connected to the connecting part, and the other end of the connecting rod is adapted to be connected to the frame.

Description

Technical Field

[0001] This invention relates to the field of rail vehicle technology, and more particularly to a bogie and a rail vehicle. Background Technology

[0002] Rail vehicles are widely used in daily travel, and lightweight design is a key research direction for rail vehicles. The research on lightweight rail vehicles mainly focuses on the structure of the bogie. The current bogie structure has reached saturation in terms of weight optimization for rail vehicles. Therefore, there is an urgent need for a new type of bogie structure. Summary of the Invention

[0003] This invention provides a bogie to address the difficulty in optimizing the weight of bogies in the prior art, thereby achieving a lightweight bogie design.

[0004] The present invention also provides a rail vehicle.

[0005] This invention provides a bogie, comprising:

[0006] The frame includes a load-bearing body and two leaf springs. A central pin channel is formed in the middle of the load-bearing body. Two mounting channels are formed along the longitudinal direction of the frame, and the two leaf springs are respectively mounted in the two mounting channels.

[0007] A central traction device is installed in a center pin channel. The central traction device includes a traction beam, a pin sleeve, a center pin, and a connecting rod. The traction beam has an assembly channel along its height direction, and a connecting part is formed on the outer surface of the traction beam. The pin sleeve is installed in the assembly channel. The pin sleeve has a pin hole and two free gaps along its height direction. Along the width direction of the rail vehicle, the two free gaps are located on both sides of the pin hole. The center pin is installed in the pin hole. One end of the connecting rod is connected to the connecting part, and the other end of the connecting rod is adapted to be connected to the frame.

[0008] According to a bogie provided by the present invention, the load-bearing body includes:

[0009] Two box-shaped beams are arranged at intervals and in parallel, and each box-shaped beam is hollow inside and forms the installation channel respectively;

[0010] A load-bearing beam is provided between two box beams, and a central pin channel is formed at the center of the load-bearing beam;

[0011] T-shaped reinforcing beams are vertically disposed on the lower surface of the load-bearing beams, and the T-shaped reinforcing beams are respectively connected to the two box beams on the side facing each other.

[0012] According to a bogie provided by the present invention, the upper surfaces of the two box beams are respectively provided with air spring mounting seats;

[0013] The air spring mounting seat is provided with a mounting protrusion that protrudes outward in the direction away from the box beam, and the distance between the two air spring mounting seats is adapted to the distance between the two leaf springs.

[0014] According to a bogie provided by the present invention, a leaf spring positioning part is formed on the lower surface of the inner side of the box girder. The leaf spring positioning part is located in the mounting channel. The upper surface of the leaf spring is provided with a connecting block. One of the leaf spring positioning part and the connecting block is constructed with a concave mounting groove, and the other of the leaf spring positioning part and the connecting block is constructed with an outwardly convex protrusion. The protrusion is adapted to engage with the mounting groove, and the protrusion and the mounting groove are respectively configured as matching cross shapes.

[0015] According to a bogie provided by the present invention, four connecting parts are provided, which are distributed circumferentially along the outer surface of the traction beam. Each pair of adjacent connecting parts is angularly positioned. The cross-section of the free gap is arc-shaped, and the two free gaps are located on the same circumference. Each free gap corresponds to two gap ends. The positions of the four connecting parts correspond to the four gap ends. A pressure cap is provided below the traction beam. The pressure cap, the pin sleeve, and the center pin are adapted to be fixed to each other by fasteners.

[0016] According to a bogie provided by the present invention, a wheel drive system is further included. The wheel drive system includes a shaft core, a bushing, and two wheels. The shaft core is rotatably mounted inside the bushing. A gearbox is constructed on the bushing, and a driving gear is provided inside the gearbox. A driven gear is sleeved on the shaft core. The driving gear and the driven gear mesh externally. The two wheels are respectively mounted on both ends of the bushing via bearings, and the two wheels are respectively connected to both ends of the shaft core via flexible plates. Each leaf spring has a pad at both ends, and the pad is connected to the bushing. The bushing is also connected to the lower surface of the box girder via a tension plate assembly.

[0017] According to a bogie provided by the present invention, a motor is connected to the bushing, one end of the motor is connected to the drive gear transmission, and the other end of the motor is provided with a braking mechanism;

[0018] The braking mechanism includes:

[0019] The housing has guide ribs on its inner surface along the direction of the motor output shaft;

[0020] A rotating component is rotatably disposed within the housing and is connected to the output shaft of the motor. The outer surface of the rotating component is provided with limiting ribs along the direction of the motor output shaft.

[0021] A moving plate and a stationary plate are disposed inside the housing. The moving plate and the stationary plate are sleeved on the rotating component at intervals. The inner circumferential surface of the moving plate is provided with a limiting groove, which is engaged with the limiting rib. The outer circumferential surface of the stationary plate is provided with a positioning groove, which is engaged with the guide rib.

[0022] A driving element is disposed within the housing. The driving element is adapted to be connected to the stationary disc and is adapted to drive the stationary disc to slide along the guide rib so that the stationary disc and the moving disc fit together to form a brake.

[0023] According to a bogie provided by the present invention, one side of the housing is fixed to the motor by fasteners, and the other side of the housing is provided with a cover. At least two brake grooves distributed circumferentially are formed on the cover. The drive member is adapted to be installed in the brake groove. Each pair of adjacent brake grooves are interconnected. One of the brake grooves is provided with an oil hole for hydraulically driving the drive member.

[0024] According to a bogie provided by the present invention, the two ends of the shaft core are respectively interference-fitted with transition members, the flexible plate is adapted to be installed on the outside of the transition members by fasteners, the wheel is an elastic wheel, and the wheel is adapted to be connected to the flexible plate by fasteners.

[0025] The present invention also provides a rail vehicle, including a car body, wherein the car body is provided with a bogie as described above.

[0026] The bogie provided in this embodiment of the invention replaces the original crossbeam and side beam structure with a load-bearing body and leaf springs. The structure of the load-bearing body is simple, and the structure of the leaf springs makes the weight of the leaf springs much less than that of the traditional side beams, resulting in a significant lightweight effect. The wheel drive system is used to realize driving and braking, and the wheel drive system can be directly integrated into the axle sleeve, saving layout space. Compared with the original brake caliper braking, the weight of the braking mechanism can be greatly reduced, which is conducive to the lightweight development of rail vehicles. Meanwhile, the pin sleeve is connected through the assembly channel of the traction beam, and the center pin is installed in the pin hole of the pin sleeve, realizing the mutual assembly between the traction beam, pin sleeve and center pin. The connecting part on the outer surface of the traction beam is connected to the frame through the connecting rod, so as to transfer the longitudinal load to the frame through the connecting rod. At the same time, the traction beam can also swing with the frame through the connecting rod to release the vertical load. The free clearance inside the pin sleeve can make the pin sleeve softer in the lateral direction and harder in the longitudinal direction. While ensuring the transmission of longitudinal load, it reduces the constraint on lateral movement within a certain displacement, and avoids adding large lateral stiffness. At the same time, when the lateral displacement exceeds the limit, the two inner side walls of the free clearance contact each other to realize the lateral stop function. This avoids the redundancy of the central traction device structural components and achieves lightweighting while retaining the lateral, vertical and longitudinal functions unchanged.

[0027] The rail vehicle provided in this embodiment of the invention, by installing the aforementioned bogie on the car body, uses a load-bearing main body and leaf springs to replace the original crossbeam and side beam structure. The structure of the load-bearing main body is simple, and the structure of the leaf springs also makes the weight of the leaf springs much less than that of the traditional side beams, resulting in a significant lightweight effect of the frame. The wheel drive system is used to realize driving and braking, and the wheel drive system can be directly integrated into the axle sleeve, saving layout space. Compared with the original brake caliper braking, the weight of the braking mechanism can be greatly reduced, which is conducive to the lightweight development of rail vehicles. Meanwhile, the pin sleeve is connected through the assembly channel of the traction beam, and the center pin is installed in the pin hole of the pin sleeve, realizing the mutual assembly between the traction beam, pin sleeve and center pin. The connecting part on the outer surface of the traction beam is connected to the frame through the connecting rod, so as to transfer the longitudinal load to the frame through the connecting rod. At the same time, the traction beam can also swing with the frame through the connecting rod to release the vertical load. The free clearance inside the pin sleeve can make the pin sleeve softer in the lateral direction and harder in the longitudinal direction. While ensuring the transmission of longitudinal load, it reduces the constraint on lateral movement within a certain displacement, and avoids adding large lateral stiffness. At the same time, when the lateral displacement exceeds the limit, the two inner side walls of the free clearance contact each other to realize the lateral stop function. This avoids the redundancy of the central traction device structural components and achieves lightweighting while retaining the lateral, vertical and longitudinal functions unchanged. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 This is one of the three-dimensional structural schematic diagrams of the bogie provided by the present invention;

[0030] Figure 2 This is the second three-dimensional structural schematic diagram of the bogie provided by the present invention;

[0031] Figure 3 This is a three-dimensional structural diagram of the framework provided by the present invention;

[0032] Figure 4 This is a three-dimensional structural schematic diagram of the leaf spring provided by the present invention;

[0033] Figure 5 This is a three-dimensional structural diagram of the central traction device provided by the present invention;

[0034] Figure 6 This is one of the cross-sectional views of the central traction device provided by the present invention;

[0035] Figure 7 This is a second cross-sectional view of the central traction device provided by the present invention;

[0036] Figure 8 This is the third sectional view of the central traction device provided by the present invention;

[0037] Figure 9 This is a three-dimensional structural diagram of the pin sleeve provided by the present invention;

[0038] Figure 10 This is a cross-sectional view of the wheel drive system provided by the present invention;

[0039] Figure 11 This is a cross-sectional view of the braking mechanism provided by the present invention.

[0040] Figure label:

[0041] 100. Frame; 200. Load-bearing body; 210. Center pin channel; 220. Mounting channel; 230. Box girder; 240. Load-bearing beam; 250. T-shaped reinforcing beam; 300. Leaf spring; 310. Pad; 320. Connecting block; 330. Mounting groove; 400. Wheel drive system; 410. Shaft core; 420. Bushing; 430. Wheel; 440. Gearbox; 450. Driven gear; 460. Flexible plate; 500. Tensioner assembly; 700. Motor; 800. Braking mechanism; 810. Shell Body; 820, Rotating component; 830, Moving disc; 840, Stationary disc; 850, Driving component; 860, Guide rib; 870, Limiting rib; 880, Limiting slot; 890, Positioning slot; 8100, Shell cover; 8110, Braking slot; 8120, Transition component; 900, Central traction device; 910, Traction beam; 9110, Assembly channel; 9120, Connecting part; 920, Pin sleeve; 9210, Pin hole; 9220, Free clearance; 930, Center pin; 940, Connecting rod; 950, Pressure cap. Detailed Implementation

[0042] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0043] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0045] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0046] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0047] The following is combined Figures 1-11The present invention describes an embodiment of a bogie, which includes a frame 100 and a central traction device 900. The frame 100 includes a load-bearing body 200 and two leaf springs 300. A center pin channel 210 is formed in the middle of the load-bearing body 200. The load-bearing body 200 has two mounting channels 220 along the longitudinal direction of the frame 100. The two leaf springs 300 are respectively mounted in the two mounting channels 220. The central traction device 900 is installed in the central pin channel 210. The central traction device 900 includes a traction beam 910, a pin sleeve 920, a central pin 930, and a connecting rod 940. The traction beam 910 has an assembly channel 9110 along the height direction. The outer surface of the traction beam 910 has a connecting part 9120. The pin sleeve 920 is installed in the assembly channel 9110. The pin sleeve 920 has a pin hole 9210 and two free gaps 9220 along the height direction. Along the width direction of the rail vehicle, the two free gaps 9220 are located on both sides of the pin hole 9210. The central pin 930 is installed in the pin hole 9210. One end of the connecting rod 940 is connected to the connecting part 9120, and the other end of the connecting rod 940 is adapted to be connected to the frame 100.

[0048] In this embodiment, the original crossbeam and side beam structure is replaced by the load-bearing body 200 and leaf spring 300. The structure of the load-bearing body 200 is simple, and the structure of the leaf spring 300 also makes the weight of the leaf spring 300 much less than that of the traditional side beam, which makes the frame 100 significantly lighter. The drive system 400 is used to realize driving and braking. The drive system 400 can be directly integrated into the bushing 420, saving layout space. Compared with the original brake caliper braking, the weight of the braking mechanism 800 can be greatly reduced, which is conducive to the lightweight development of rail vehicles. Simultaneously, the pin sleeve 920 is connected through the assembly channel 9110 of the traction beam 910, and the center pin 930 is installed in the pin hole 9210 of the pin sleeve 920, realizing the mutual assembly between the traction beam 910, the pin sleeve 920, and the center pin 930. The connecting part 9120 on the outer surface of the traction beam 910 is connected to the frame 100 through the connecting rod 940, so as to transmit the longitudinal load to the frame 100 using the connecting rod 940. At the same time, the traction beam 910 can also swing with the frame 100 through the connecting rod 940 to release the vertical load. For lateral loads, the free clearance 9220 inside the pin sleeve 920 allows the pin sleeve 920 to be softer in the lateral direction and harder in the longitudinal direction. While ensuring the transmission of longitudinal loads, it reduces the constraint on lateral movement within a certain displacement range and avoids adding large lateral stiffness. At the same time, when the lateral displacement exceeds the limit, the two inner sidewalls of the free clearance 9220 contact each other to achieve the lateral stop function. This avoids the redundancy of the central traction device 900 structural components and achieves lightweighting while retaining the lateral, vertical and longitudinal functions unchanged.

[0049] like Figures 1-3As shown, the load-bearing body 200 includes two box beams 230, a load-bearing beam 240, and a T-shaped reinforcing beam 250. The two box beams 230 are spaced apart and parallel, each box beam 230 being hollow and forming an installation channel 220. The load-bearing beam 240 is located between the two box beams 230, and a center pin channel 210 is formed at the center of the load-bearing beam 240. The T-shaped reinforcing beam 250 is vertically arranged on the lower surface of the load-bearing beam 240, and the T-shaped reinforcing beam 250 is connected to one side of each of the two box beams 230 facing each other.

[0050] The main load-bearing structure is composed of box beams 230, load-bearing beams 240 and T-shaped reinforcing beams 250. The main load-bearing structure and leaf springs 300 replace the original crossbeams and side beams. The main load-bearing structure is welded and has the characteristics of simple structure, high strength and convenient molding. The structural form of leaf springs 300 also makes the weight of leaf springs 300 much less than that of traditional side beams, resulting in a significant weight reduction effect for frame 100.

[0051] The box girder 230, load-bearing beam 240, and T-shaped reinforcing beam 250 are welded together, allowing for independent fabrication and structural design of their shapes. This enables the rational planning of plate thickness and beam width for each component based on their respective load-bearing requirements, ensuring both lightweight design and strength requirements are met. After the box girder 230, load-bearing beam 240, and T-shaped reinforcing beam 250 are fabricated, they are then welded together by a welding mechanism to form the main load-bearing structure.

[0052] The box girder 230 has a hollow internal structure. An installation channel 220 is provided longitudinally inside the box girder 230, allowing the leaf spring 300 to be installed within the installation channel 220 and arranged longitudinally along the box girder 230. This allows the leaf spring 300 to replace the original side beam structure. The leaf spring 300 is made of carbon fiber, which has advantages such as high strength, light weight, and ease of processing, thus meeting the lightweight design requirements of the frame 100.

[0053] In this embodiment, the upper surfaces of the two box beams 230 are respectively provided with air spring mounting seats. The air spring mounting seats are provided with mounting protrusions that bulge outwards in the direction away from the box beams 230, and the distance between the two air spring mounting seats is adapted to the distance between the two leaf springs 300.

[0054] The air spring mounting bracket is used to connect the air spring. The mounting bracket has a mounting protrusion that protrudes outwards from the leaf spring 300. The air spring has a corresponding groove. When installing the air spring, aligning the groove of the air spring with the mounting protrusion achieves proper positioning. Compared to the traditional method of inserting the air spring into the mounting bracket, this method prevents the air spring from being inserted into the mounting channel 220, thus preventing damage to the leaf spring 300 within the mounting channel 220.

[0055] The spacing between the two air spring mounting seats is matched with the spacing between the two leaf springs 300. Specifically, the spacing between the two air spring mounting seats is the same as the spacing between the two leaf springs 300 to avoid generating additional torque on the leaf springs 300.

[0056] In this embodiment, a leaf spring 300 positioning part is formed on the lower surface of the inner side of the box girder 230. The leaf spring 300 positioning part is located within the mounting channel 220, wherein, as shown... Figure 4 As shown, the upper surface of the leaf spring 300 is provided with a connecting block 320. One of the leaf spring 300 positioning part and the connecting block 320 is constructed with a concave mounting groove 330, and the other of the leaf spring 300 positioning part and the connecting block 320 is constructed with an outward protrusion. The protrusion is adapted to be engaged with the mounting groove 330, and the protrusion and the mounting groove 330 are respectively configured as matching cross shapes.

[0057] The mounting grooves 330 and protrusions on the leaf spring 300 mounting part and the connecting block 320 cooperate with each other to achieve the positioning and installation of the leaf spring 300. The protrusions and mounting grooves 330 are respectively set as matching cross shapes to achieve the longitudinal and lateral limiting functions of the leaf spring 300. Specifically, the leaf spring 300 mounting part is constructed with a cross-shaped protrusion, and the connecting block 320 is constructed with a cross-shaped mounting groove 330.

[0058] According to the bogie provided by the present invention, such as Figures 5-9 As shown, there are four connecting parts 9120, which are distributed circumferentially along the outer surface of the traction beam 910. Each pair of adjacent connecting parts 9120 is set at an angle. The cross-section of the free gap 9220 is arc-shaped, and the two free gaps 9220 are located on the same circumference. Each free gap 9220 corresponds to two gap ends. The positions of the four connecting parts 9120 correspond to the four gap ends. A pressure cover 950 is provided below the traction beam 910. The pressure cover 950, the pin sleeve 920, and the center pin 930 are suitable for being fixed to each other by fasteners.

[0059] Four connecting parts 9120 can be provided to connect four connecting rods 940 to the outer surface of the traction beam 910. Since each pair of adjacent connecting parts 9120 is set at an angle, the four connecting rods 940 are distributed at a certain angle, which can transmit the longitudinal force to the four directions of the frame 100 through the four connecting rods 940, so as to achieve uniform and distributed transmission of longitudinal load.

[0060] The arc-shaped free gaps 9220 can adapt to the shape of the traction beam 910. The two free gaps 9220 are not only located on the same circumference but also arranged symmetrically, with the axis of symmetry of the two free gaps 9220 being one of the diameter segments of the traction beam 910. The arc-shaped free gaps 9220 can form two gap ends, and the positions of the four connecting parts 9120 correspond to the four gap ends respectively, further ensuring that the longitudinal load is transmitted evenly and distributedly. At the same time, it allows the lateral load to be limited by the pin sleeve 920.

[0061] Along the top-to-bottom direction, the assembly channel 9110 is configured to taper, and the center pin 930 is adapted to the assembly channel 9110, and the center pin 930 is suitable for being inserted into the assembly channel 9110 from above the traction beam 910. The taper-shaped assembly channel 9110 facilitates the installation of the center pin 930, and corresponding to the top-to-bottom taper-shaped assembly channel 9110, the center pin 930 is also configured as a top-to-bottom taper frustum structure.

[0062] The pressure cap 950 has a connecting hole, and the center pin 930 has a threaded hole at the bottom. Bolt-type fasteners are sequentially inserted into the connecting hole of the pressure cap 950, the assembly channel 9110 of the pin sleeve 920, and the threaded hole of the center pin 930 to achieve the connection between the pressure cap 950, the pin sleeve 920, and the center pin 930.

[0063] The middle part of the pressure cap 950 protrudes towards the pin sleeve 920 so that the middle part of the pressure cap 950 can abut against the center pin 930. With the fastener locking and fixing, a stable connection is formed between the pressure cap 950, the pin sleeve 920 and the center pin 930.

[0064] According to the bogie provided by the present invention, such as Figure 10 As shown, the wheel drive system 400 includes a shaft core 410, a bushing 420, and two wheels 430. The shaft core 410 is rotatably mounted inside the bushing 420. A gearbox 440 is constructed on the bushing 420, and a driving gear is provided inside the gearbox 440. A driven gear 450 is sleeved on the shaft core 410, and the driving gear and the driven gear 450 mesh externally. The two wheels 430 are respectively mounted on both ends of the bushing 420 through bearings, and the two wheels 430 are respectively connected to both ends of the shaft core 410 through flexible plates 460. Each leaf spring 300 has a pad 310 at both ends, and the pad 310 is connected to the bushing 420. The bushing 420 is also connected to the lower surface of the box beam 230 through a pull plate assembly 500.

[0065] During the driving process, the driving gear of the gearbox 440 rotates, thereby driving the driven gear 450 to rotate. The rotation of the driven gear 450 drives the shaft core 410 to rotate, thus causing the wheel 430 to rotate via the transmission of the flexible plate 460, achieving driving. During the braking process, the output shaft of the motor 700 is suppressed by the braking mechanism 800, thereby braking the driving gear, and braking the wheel 430 via the transmission of the shaft core 410 and the flexible plate 460.

[0066] A motor 700 is connected to a bushing 420. One end of the motor 700 is connected to a drive gear transmission, and the other end of the motor 700 is equipped with a braking mechanism 800. The braking mechanism 800 includes a housing 810, a rotating component 820, a moving disc 830, a stationary disc 840, and a driving component 850. The inner surface of the housing 810 is provided with guide ribs 860 along the direction of the output shaft of the motor 700. The rotating component 820 is rotatably disposed within the housing 810 and is connected to the output shaft of the motor 700. The outer surface of the rotating component 820 is provided with limiting ribs 870 along the direction of the output shaft of the motor 700. A movable disc 830 and a stationary disc 840 are disposed within a housing 810. The movable disc 830 and the stationary disc 840 are spaced apart and sleeved on a rotating component 820. The inner circumferential surface of the movable disc 830 is provided with a limiting groove 880, which engages with a limiting rib 870. The outer circumferential surface of the stationary disc 840 is provided with a positioning groove 890, which engages with a guide rib 860. A driving component 850 is disposed within the housing 810. The driving component 850 is adapted to connect with the stationary disc 840 and is adapted to drive the stationary disc 840 to slide along the guide rib 860 so that the stationary disc 840 and the movable disc 830 are in contact with each other to form a brake.

[0067] During the driving process, the motor 700 drives the driving gear to rotate, which in turn drives the driven gear 450 to rotate. The rotation of the driven gear 450 drives the shaft core 410 to rotate, causing the wheel 430 to rotate via the flexible plate 460, thus achieving driving. Furthermore, during the driving process, the stationary disc 840 remains stationary under the limiting effect of the positioning groove 890 and the guide rib 860, while the moving disc 830 rotates with the output shaft of the motor 700 under the limiting effect of the limiting groove 880 and the limiting rib 870, without affecting the driving process.

[0068] During braking, the drive component 850 pushes the moving disc 830 and the stationary disc 840 closer together. The stationary disc 840 slides axially under the limiting action of the positioning groove 890 and the guide rib 860, while the moving disc 830 slides axially under the limiting action of the limiting groove 880 and the limiting rib 870. The axial sliding of the moving disc 830 and the stationary disc 840 will cause them to press tightly against each other, thereby generating a braking force on the moving disc 830 to stop its rotation. As the moving disc 830 gradually stops rotating, it can drive the output shaft of the motor 700 to stop rotating, and brake the wheel 430 through the transmission action of the drive gear, driven gear 450, shaft core 410, and flexible plate 460.

[0069] The bushing 420 is connected to the lower surface of the box girder 230 via the tie plate assembly 500. The tie plate assembly 500 includes four overlapping spring steel plates with pleats in the middle, which achieves large lateral positioning stiffness and can release the side roll displacement of the frame 100 and the wheel drive system 400 through the pleats of the tie plate assembly 500 without adding a series of stiffness due to side roll.

[0070] One side of the housing 810 is fixed to the motor 700 by fasteners, and the other side of the housing 810 is provided with a cover 8100. At least two brake grooves 8110 are formed on the cover 8100, which are distributed circumferentially. The drive member 850 is adapted to be installed in the brake groove 8110. Each pair of adjacent brake grooves 8110 are interconnected. One of the brake grooves 8110 is provided with an oil hole for hydraulically driving the drive member 850 to move.

[0071] The drive component 850 is specifically a hydraulic drive mechanism. The drive component 850 is installed in the brake groove 8110, and an oil hole is opened in one of the brake grooves 8110 to connect to the oil pressure pipeline to control the action of the drive component 850. Multiple brake grooves 8110 will correspond to multiple brake components, which can ensure the balance and stability during the braking process, and can also ensure successful braking by driving from multiple points.

[0072] Both ends of the shaft core 410 are interference-fitted with transition pieces 8120. A flexible plate 460 is adapted to be mounted on the outside of the transition piece 8120 via fasteners. The wheel 430 is an elastic wheel 430, adapted to be connected to the flexible plate 460 via fasteners. The elastic wheel 430 is connected to the flexible plate 460 via fasteners, and the flexible plate 460 is connected to the transition pieces 8120 connected to both ends of the shaft core 410 via fasteners, thereby realizing transmission between the shaft core 410 and the wheel 430.

[0073] On the other hand, the present invention also provides a rail vehicle, including a car body, the car body being provided with bogies as described above.

[0074] In this embodiment, by installing the aforementioned bogie on the car body, the original crossbeam and side beam structure is replaced by the load-bearing body 200 and leaf spring 300. The structure of the load-bearing body 200 is simple, and the structure of the leaf spring 300 also makes the weight of the leaf spring 300 much less than that of the traditional side beam, resulting in a significant weight reduction effect of the frame 100. The drive system 400 is used to realize driving and braking, and the drive system 400 can be directly integrated into the bushing 420, saving layout space. Compared with the original brake caliper braking, the weight of the braking mechanism 800 can be greatly reduced, which is conducive to the lightweight development of rail vehicles. Simultaneously, the pin sleeve 920 is connected through the assembly channel 9110 of the traction beam 910, and the center pin 930 is installed in the pin hole 9210 of the pin sleeve 920, realizing the mutual assembly between the traction beam 910, the pin sleeve 920, and the center pin 930. The connecting part 9120 on the outer surface of the traction beam 910 is connected to the frame 100 through the connecting rod 940, so as to transmit the longitudinal load to the frame 100 using the connecting rod 940. At the same time, the traction beam 910 can also swing with the frame 100 through the connecting rod 940 to release the vertical load. For lateral loads, the free clearance 9220 inside the pin sleeve 920 allows the pin sleeve 920 to be softer in the lateral direction and harder in the longitudinal direction. While ensuring the transmission of longitudinal loads, it reduces the constraint on lateral movement within a certain displacement range and avoids adding large lateral stiffness. At the same time, when the lateral displacement exceeds the limit, the two inner sidewalls of the free clearance 9220 contact each other to achieve the lateral stop function. This avoids the redundancy of the central traction device 900 structural components and achieves lightweighting while retaining the lateral, vertical and longitudinal functions unchanged.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A bogie, characterized in that, include: The frame includes a load-bearing body and two leaf springs. A central pin channel is formed in the middle of the load-bearing body. Two mounting channels are formed along the longitudinal direction of the frame, and the two leaf springs are respectively mounted in the two mounting channels. A central traction device is installed in a center pin channel. The central traction device includes a traction beam, a pin sleeve, a center pin, and a connecting rod. The traction beam has an assembly channel along its height direction, and a connecting part is constructed on the outer surface of the traction beam. The pin sleeve is installed in the assembly channel. The pin sleeve has a pin hole and two free gaps along its height direction. Along the width direction of the rail vehicle, the two free gaps are located on both sides of the pin hole. The center pin is installed in the pin hole. One end of the connecting rod is connected to the connecting part, and the other end of the connecting rod is adapted to be connected to the frame. The four connecting parts are arranged circumferentially along the outer surface of the traction beam. Each pair of adjacent connecting parts is set at an angle. The cross-section of the free gap is arc-shaped, and the two free gaps are located on the same circumference. Each free gap corresponds to two gap ends. The positions of the four connecting parts correspond to the four gap ends. A pressure cap is provided below the traction beam. The pressure cap, the pin sleeve, and the center pin are adapted to be fixed to each other by fasteners.

2. The bogie according to claim 1, characterized in that, The supporting body includes: Two box-shaped beams are arranged at intervals and in parallel, and each box-shaped beam is hollow inside and forms the installation channel respectively; A load-bearing beam is provided between two box beams, and a central pin channel is formed at the center of the load-bearing beam; T-shaped reinforcing beams are vertically disposed on the lower surface of the load-bearing beams, and the T-shaped reinforcing beams are respectively connected to the two box beams on the side facing each other.

3. The bogie according to claim 2, characterized in that, The upper surfaces of the two box beams are respectively provided with air spring mounting seats; The air spring mounting seat is provided with a mounting protrusion that protrudes outward in the direction away from the box beam, and the distance between the two air spring mounting seats is adapted to the distance between the two leaf springs.

4. The bogie according to claim 2, characterized in that, A leaf spring positioning part is formed on the lower surface of the inner side of the box girder. The leaf spring positioning part is located in the mounting channel. The upper surface of the leaf spring is provided with a connecting block. One of the leaf spring positioning part and the connecting block is constructed with a concave mounting groove. The other of the leaf spring positioning part and the connecting block is constructed with an outward protrusion. The protrusion is adapted to be engaged with the mounting groove. The protrusion and the mounting groove are respectively set as matching cross shapes.

5. The bogie according to claim 2, characterized in that, It also includes a wheel drive system, which includes a shaft core, a bushing, and two wheels. The shaft core is rotatably mounted inside the bushing, and a gearbox is constructed on the bushing. The gearbox contains a driving gear, and the shaft core is sleeved with a driven gear. The driving gear and the driven gear mesh externally. The two wheels are respectively mounted on both ends of the bushing via bearings, and the two wheels are respectively connected to both ends of the shaft core via flexible plates. Each leaf spring has a pad at both ends, and the pad is connected to the bushing. The bushing is also connected to the lower surface of the box girder via a tension plate assembly.

6. The bogie according to claim 5, characterized in that, A motor is connected to the bushing, one end of the motor is connected to the drive gear transmission, and the other end of the motor is provided with a braking mechanism; The braking mechanism includes: The housing has guide ribs on its inner surface along the direction of the motor output shaft; A rotating component is rotatably disposed within the housing and is connected to the output shaft of the motor. The outer surface of the rotating component is provided with limiting ribs along the direction of the motor output shaft. A moving plate and a stationary plate are disposed inside the housing. The moving plate and the stationary plate are sleeved on the rotating component at intervals. The inner circumferential surface of the moving plate is provided with a limiting groove, which is engaged with the limiting rib. The outer circumferential surface of the stationary plate is provided with a positioning groove, which is engaged with the guide rib. A driving element is disposed within the housing. The driving element is adapted to be connected to the stationary disc and is adapted to drive the stationary disc to slide along the guide rib so that the stationary disc and the moving disc fit together to form a brake.

7. The bogie according to claim 6, characterized in that, One side of the housing is fixed to the motor by fasteners, and the other side of the housing is provided with a cover. At least two circumferentially distributed brake grooves are formed on the cover. The drive member is adapted to be installed in the brake groove. Each pair of adjacent brake grooves are interconnected. One of the brake grooves is provided with an oil hole for hydraulically driving the drive member.

8. The bogie according to claim 7, characterized in that, Both ends of the shaft are respectively interference-fitted with transition members, the flexible plate is adapted to be installed on the outside of the transition members by fasteners, the wheel is an elastic wheel, and the wheel is adapted to be connected to the flexible plate by fasteners.

9. A rail vehicle, characterized in that, Includes a vehicle body, wherein the vehicle body is provided with a bogie as described in any one of claims 1-8.

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