Bogie and railway vehicle

Abstract

The invention relates to the technical field of railway vehicles, and provides a bogie and a railway vehicle. The bogie comprises a framework and a central traction device, the framework comprises a bearing main body and two plate springs, a central pin channel is formed in the middle of the bearing main body, and two mounting channels are formed in the bearing main body in the longitudinal direction of the framework; the two plate springs are installed in the two installation channels correspondingly. The central traction device is installed in the central pin channel and comprises a traction beam, a pin sleeve, a central pin and a connecting rod, the traction beam is provided with an assembly channel in the height direction, the outer surface of the traction beam is provided with a connecting part, the pin sleeve is installed in the assembly channel, and a pin hole and two free gaps are formed in the pin sleeve in the height direction; the two free gaps are located on the two sides of the pin hole respectively, the center pin is installed in the pin hole, one end of the connecting rod is connected with the connecting part, and the other end of the connecting rod is suitable for being connected to a framework.

Description

Technical Field

[0001] The present invention relates to the technical field of rail vehicles, and in particular to a bogie and a rail vehicle. Background Art

[0002] Rail vehicles are widely used in daily travel. Lightweight design is a key research direction of rail vehicles. The research on lightweight rail vehicles is mainly on the structure of the bogie. The current bogie structure has reached saturation in terms of weight optimization of rail vehicles. Therefore, a new structural form of bogie is urgently needed. Summary of the invention

[0003] The present invention provides a bogie, which is used to solve the problem that the weight of the bogie in the prior art is difficult to optimize, and realizes the lightweight design of the bogie.

[0004] The invention also provides a rail vehicle.

[0005] The present invention provides a bogie, comprising:

[0006] The frame comprises a bearing body and two leaf springs, wherein a center pin channel is formed in the middle of the bearing body, and two mounting channels are formed in the bearing body 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 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 is provided with an assembly channel along the height direction. The outer surface of the traction beam is provided with a connecting portion. The pin sleeve is installed in the assembly channel. A pin hole and two free gaps are provided in the pin sleeve along the height direction. Along the width direction of the rail vehicle, the two free gaps are respectively 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 portion, and the other end of the connecting rod is suitable for being connected to the frame.

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

[0009] Two box beams are spaced apart and arranged in parallel, each of the box beams is hollow inside and forms the installation channel respectively;

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

[0011] The T-shaped reinforcement beam is vertically arranged on the lower surface of the load-bearing beam, and the T-shaped reinforcement beam is respectively connected with the two sides of the two box beams facing each other.

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

[0013] The empty spring mounting seat is provided with a mounting protrusion protruding outward in the direction away from the box beam, and the distance between the two empty 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 portion is formed on the lower surface of the inner side of the box beam, and the leaf spring positioning portion is located in the installation channel, wherein a connecting block is provided on the upper surface of the leaf spring, and one of the leaf spring positioning portion and the connecting block is configured with an inwardly concave installation groove, and the other of the leaf spring positioning portion and the connecting block is configured with an outwardly convex protrusion, the protrusion is suitable for being snapped into the installation groove, and the protrusion and the installation groove are respectively arranged to be matched cross shapes.

[0015] According to a bogie provided by the present invention, four connecting parts are arranged, and the four connecting parts are distributed at intervals along the circumference of the outer surface of the traction beam, and each two adjacent connecting parts are arranged at an angle, and the cross-section of the free gap is arc-shaped, and the two free gaps are located on the same circumference, wherein each of the free gaps corresponds to two gap ends, and the positions of the four connecting parts correspond to the four gap ends, respectively, and a pressure cover is provided under the traction beam, and the pressure cover, the pin sleeve and the center pin are suitable for being fixed to each other by fasteners.

[0016] A bogie provided according to the present invention also includes a wheel drive system, which includes an axle core, a sleeve and two wheels. The axle core is rotatably installed in the sleeve, a gear box is constructed on the sleeve, a driving tooth is provided in the gear box, the axle core is sleeved with a driven tooth, the driving tooth is externally meshed with the driven tooth, the two wheels are respectively installed at the two ends of the sleeve through bearings, and the two wheels are respectively connected to the two ends of the axle core through flexible plates, wherein each of the leaf springs is provided with a pad at both ends, the pad is connected to the sleeve, and the sleeve is also connected to the lower surface of the box beam through a pull plate assembly.

[0017] According to a bogie provided by the present invention, a motor is connected to the shaft sleeve, one end of the motor is transmission-connected to the driving gear, and a brake mechanism is provided at the other end of the motor;

[0018] The braking mechanism comprises:

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

[0020] A rotating member, rotatably disposed in the housing, and connected to the output shaft of the motor, wherein the outer surface of the rotating member is provided with a limiting rib along the direction of the output shaft of the motor;

[0021] A moving plate and a static plate are arranged in the housing, the moving plate and the static plate are sleeved on the rotating member at intervals, the inner circumference of the moving plate is provided with a limit slot, the limit slot is clamped on the limit rib, and the outer circumference of the static plate is provided with a positioning groove, the positioning groove is clamped on the guide rib;

[0022] A driving member is disposed in the housing, the driving member is adapted to be connected to the static plate, and the driving member is adapted to drive the static plate to slide along the guide ribs so that the static plate and the dynamic plate are fitted to each other to form a brake.

[0023] According to a bogie provided by the present invention, one side of the shell is fixed to the motor by a fastener, and the other side of the shell is provided with a shell cover, and at least two brake grooves distributed along the circumferential direction are formed on the shell cover, and the driving member is suitable for being installed in the brake grooves, and each adjacent two brake grooves are connected to each other, and one of the brake grooves is provided with an oil hole for oil pressure driving the driving member to operate.

[0024] According to a bogie provided by the present invention, transition pieces are interference-connected at both ends of the shaft core, the flexible plate is suitable for being installed on the outside of the transition piece through fasteners, the wheel is an elastic wheel, and the wheel is suitable for being connected to the flexible plate through fasteners.

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

[0026] The bogie provided in the embodiment of the present invention replaces the original crossbeam and side beam structure with a load-bearing body and a leaf spring. The structure of the load-bearing body is simple, and the structural form of the leaf spring also makes the weight of the leaf spring much smaller than the weight of the traditional side beam, so that the lightweight effect of the frame is obvious. The wheel drive system is used to achieve driving and braking, and the wheel drive system can be directly integrated into the axle sleeve, which saves layout space. Compared with the original caliper braking, the weight of the braking mechanism can be greatly reduced, which is beneficial to the lightweight development of rail vehicles. At the same time, 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 to realize the mutual assembly between the traction beam, the pin sleeve and the center pin. The connection part of the outer surface of the traction beam is connected to the frame through a connecting rod, so that the longitudinal load is transmitted to the frame by 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 gap inside the pin sleeve can make the pin sleeve softer laterally and harder longitudinally. While ensuring the transmission of the longitudinal load, the constraint on the lateral movement within a certain displacement is reduced to avoid adding a large lateral stiffness. At the same time, when the lateral displacement exceeds the limit, the two inner walls of the free gap contact each other to realize the lateral stop function, thereby avoiding the redundancy of the structural parts of the central traction device and achieving lightweight while keeping the lateral, vertical and longitudinal functions unchanged.

[0027] The rail vehicle provided by the embodiment of the present invention installs the aforementioned bogie on the vehicle body, and uses a load-bearing body and a leaf spring to replace the original crossbeam and side beam structure. The structure of the load-bearing body is simple, and the structural form of the leaf spring also makes the weight of the leaf spring much smaller than the weight of the traditional side beam, so that the frame lightweight effect is obvious. The wheel drive system is used to achieve driving and braking, and the wheel drive system can be directly integrated into the axle sleeve, which saves layout space. Compared with the original brake caliper braking, the weight of the brake mechanism can be greatly reduced, which is conducive to the lightweight development of rail vehicles. At the same time, 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 to realize the mutual assembly between the traction beam, the pin sleeve and the center pin. The connection part of the outer surface of the traction beam is connected to the frame through a connecting rod, so that the longitudinal load is transmitted to the frame by 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 gap inside the pin sleeve can make the pin sleeve softer laterally and harder longitudinally. While ensuring the transmission of the longitudinal load, the constraint on the lateral movement within a certain displacement is reduced to avoid adding a large lateral stiffness. At the same time, when the lateral displacement exceeds the limit, the two inner walls of the free gap contact each other to realize the lateral stop function, thereby avoiding the redundancy of the structural parts of the central traction device and achieving lightweight while keeping the lateral, vertical and longitudinal functions unchanged. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[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 schematic diagram of the three-dimensional structure of the bogie provided by the present invention;

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

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

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

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

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

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

[0037] Fig. 9 It is a schematic diagram of the three-dimensional structure of the pin sleeve provided by the present invention;

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

[0039] Fig.11 It is a cross-sectional view of the brake mechanism provided by the present invention.

[0040] Reference numerals:

[0041] 100, frame; 200, bearing body; 210, center pin channel; 220, installation channel; 230, box beam; 240, bearing beam; 250, T-shaped reinforcement beam; 300, leaf spring; 310, pad; 320, connecting block; 330, installation groove; 400, wheel drive system; 410, shaft core; 420, shaft sleeve; 430, wheel; 440, gear box; 450, driven gear; 460, flexible plate; 500, pull plate assembly; 700, motor; 800, brake mechanism; 810, shell body; 820, rotating part; 830, moving plate; 840, static plate; 850, driving part; 860, guide rib; 870, limiting rib; 880, limiting slot; 890, positioning slot; 8100, shell cover; 8110, brake slot; 8120, transition piece; 900, central traction device; 910, traction beam; 9110, assembly channel; 9120, connecting part; 920, pin sleeve; 9210, pin hole; 9220, free gap; 930, center pin; 940, connecting rod; 950, pressure cover. DETAILED DESCRIPTION

[0042] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0043] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and 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 devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0044] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0045] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0046] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0047] Combine the following Figure 1-Figure 11An embodiment of the present invention is described. This embodiment provides a bogie, including 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 is formed with two installation channels 220 along the longitudinal direction of the frame 100. The two leaf springs 300 are respectively installed in the two installation channels 220. The central traction device 900 is installed in the center pin channel 210. The central traction device 900 includes a traction beam 910, a pin sleeve 920, a center pin 930 and a connecting rod 940. The traction beam 910 is configured with an assembly channel 9110 along the height direction. The outer surface of the traction beam 910 is configured with a connecting portion 9120. The pin sleeve 920 is installed in the assembly channel 9110. A pin hole 9210 and two free gaps 9220 are configured in the pin sleeve 920 along the height direction. Along the width direction of the rail vehicle, the two free gaps 9220 are respectively located on both sides of the pin hole 9210. The center pin 930 is installed in the pin hole 9210. One end of the connecting rod 940 is connected to the connecting portion 9120, and the other end of the connecting rod 940 is suitable for connecting to the frame 100.

[0048] In this embodiment, the original cross beam and side beam structure are replaced by the load-bearing body 200 and the leaf spring 300. The structure of the load-bearing body 200 is simple, and the structural form of the leaf spring 300 also makes the weight of the leaf spring 300 much smaller than the weight of the traditional side beam, so that the frame 100 has a significant lightweight effect. The wheel drive system 400 is used to achieve driving and braking. The wheel drive system 400 can be directly integrated into the shaft sleeve 420, which saves layout space. Compared with the original caliper braking, the weight of the brake mechanism 800 can be greatly reduced, which is conducive to the lightweight development of rail vehicles. At the same time, 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, so as to realize the mutual assembly between the traction beam 910, the pin sleeve 920 and the center pin 930. The connecting portion 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 by 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. In order to withstand the lateral load, the free gap 9220 inside the pin sleeve 920 can make the pin sleeve 920 softer in the lateral direction and harder in the longitudinal direction, thereby reducing the constraint on lateral movement within a certain displacement while ensuring the transmission of the longitudinal load, and avoiding the addition of a large lateral stiffness. At the same time, when the lateral displacement exceeds the limit, the two inner walls of the free gap 9220 contact each other to achieve a lateral stop function, thereby avoiding the redundancy of the structural parts of the central traction device 900 and achieving lightweight while retaining the lateral, vertical and longitudinal functions unchanged.

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

[0050] The main bearing structure is formed by a box beam 230, a load-bearing beam 240 and a T-shaped reinforcing beam 250. The main bearing structure and the leaf spring 300 replace the original cross beam and side beam structure. The main bearing structure is formed by welding, and has the characteristics of simple structure, high strength, and easy forming. The structural form of the leaf spring 300 also makes the weight of the leaf spring 300 much smaller than the weight of the traditional side beam, so that the frame 100 has a significant lightweight effect.

[0051] The box beam 230, the load-bearing beam 240 and the T-shaped reinforcement beam 250 are welded and formed, so that the shapes of the box beam 230, the load-bearing beam 240 and the T-shaped reinforcement beam 250 can be independently processed and structurally designed, and the plate thickness, beam width, etc. of the box beam 230, the load-bearing beam 240 and the T-shaped reinforcement beam 250 can be reasonably planned based on their respective load-bearing requirements, so as to meet the requirements of lightweight design while ensuring that the strength requirements are met. After the box beam 230, the load-bearing beam 240 and the T-shaped reinforcement beam 250 are processed respectively, they are welded by a welding mechanism to form the main load-bearing structure.

[0052] The box beam 230 is a hollow structure. The box beam 230 has a mounting channel 220 disposed longitudinally therein, so that the leaf spring 300 can be installed in the mounting channel 220 and arranged longitudinally along the box beam 230, thereby enabling the leaf spring 300 to replace the original side beam structure. The leaf spring 300 is made of carbon fiber material, which has the advantages of high strength, light weight, and easy processing, thereby 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 empty spring mounting seats, wherein the empty spring mounting seats are provided with mounting protrusions protruding outwards in the direction away from the box beam 230 , and the spacing between the two empty spring mounting seats is adapted to the spacing between the two leaf springs 300 .

[0054] The empty spring mounting seat is used to connect the empty spring. The empty spring mounting seat is provided with a mounting protrusion that protrudes outward in the direction opposite to the leaf spring 300. The empty spring is provided with a groove corresponding to the mounting protrusion. When installing the empty spring, the groove of the empty spring is aligned with the mounting protrusion to achieve the positioning installation of the empty spring. Compared with the traditional method of inserting the empty spring into the mounting seat, the empty spring will not be inserted into the installation channel 220 in the above method, so that the empty spring is prevented from damaging the leaf spring 300 in the installation channel 220.

[0055] The distance between the two empty spring mounting seats is adapted to the distance between the two leaf springs 300 . Specifically, the distance between the two empty spring mounting seats is the same as the distance between the two leaf springs 300 , so as to avoid generating additional torque on the leaf springs 300 .

[0056] In this embodiment, a leaf spring 300 positioning portion is formed on the lower surface of the inner side of the box beam 230, and the leaf spring 300 positioning portion is located in the installation channel 220, wherein Figure 4 As shown, a connecting block 320 is provided on the upper surface of the leaf spring 300, one of the positioning portion of the leaf spring 300 and the connecting block 320 is configured with an inwardly concave mounting groove 330, and the other of the positioning portion of the leaf spring 300 and the connecting block 320 is configured with an outwardly convex protrusion, the protrusion is suitable for being snapped into the mounting groove 330, and the protrusion and the mounting groove 330 are respectively arranged to be matching cross shapes.

[0057] The mounting portion of the leaf spring 300 and the mounting groove 330 on the connecting block 320 cooperate with the protrusion to realize the positioning and installation of the leaf spring 300. The protrusion and the mounting groove 330 are respectively arranged in a matching cross shape to realize the longitudinal and transverse limiting functions of the leaf spring 300. Specifically, a cross-shaped protrusion is constructed on the mounting portion of the leaf spring 300, and a cross-shaped mounting groove 330 is constructed on the connecting block 320.

[0058] According to the bogie provided by the present invention, Figure 5-Figure 9 As shown, there are four connecting parts 9120, and the four connecting parts 9120 are distributed at intervals along the circumference of the outer surface of the traction beam 910, and each two adjacent connecting parts 9120 are arranged at an angle, and the cross-section of the free gap 9220 is arc-shaped, and the two free gaps 9220 are located on the same circumference, wherein each free gap 9220 corresponds to two gap ends, and the positions of the four connecting parts 9120 correspond to the four gap ends, respectively. A pressure cover 950 is provided under the traction beam 910, and 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 set to connect four connecting rods 940 on the outer surface of the traction beam 910. Since every two adjacent connecting parts 9120 are set at an angle, the four connecting rods 940 are distributed at a certain angle. The longitudinal force can be transmitted to the four directions of the frame 100 through the four connecting rods 940, thereby realizing uniform and dispersed transmission of the longitudinal load.

[0060] The arc-shaped free gap 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, and the symmetry axis of the two free gaps 9220 is one of the diameter segments of the traction beam 910. The arc-shaped free gap 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 dispersedly. At the same time, the lateral load can be limited by the pin sleeve 920.

[0061] From top to bottom, the assembly channel 9110 is configured to be tapered, 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 tapered assembly channel 9110 facilitates the installation of the center pin 930, and corresponding to the tapered assembly channel 9110 from top to bottom, the center pin 930 is also configured to be a truncated cone-shaped structure tapered from top to bottom.

[0062] Among them, a connecting hole is constructed on the pressure cover 950, and a threaded hole is constructed at the bottom of the center pin 930. Bolt-type fasteners are successively inserted into the connecting hole of the pressure cover 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 cover 950, the pin sleeve 920 and the center pin 930.

[0063] The middle part of the pressure cover 950 protrudes toward the pin sleeve 920 so that the middle part of the pressure cover 950 can abut against the center pin 930, and then cooperate with the locking and fixing of the fastener to form a stable connection between the pressure cover 950, the pin sleeve 920 and the center pin 930.

[0064] According to the bogie provided by the present invention, Fig.10 As shown, the wheel drive system 400 includes an axle core 410, a sleeve 420 and two wheels 430. The axle core 410 is rotatably installed in the sleeve 420. A gear box 440 is constructed on the sleeve 420. A driving tooth is arranged in the gear box 440. The axle core 410 is sleeved with a driven tooth 450. The driving tooth is externally meshed with the driven tooth 450. The two wheels 430 are respectively installed at both ends of the sleeve 420 through bearings, and the two wheels 430 are respectively connected to both ends of the axle core 410 through flexible plates 460, wherein pads 310 are respectively provided at both ends of each leaf spring 300, and the pads 310 are connected to the sleeve 420. The sleeve 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 active teeth of the gear box 440 rotate, thereby driving the driven teeth 450 to rotate. During the rotation of the driven teeth 450, the shaft core 410 is driven to rotate, so that the wheel 430 rotates through the transmission of the flexible plate 460 to achieve driving. During the braking process, the output shaft of the motor 700 is inhibited from rotating through the braking mechanism 800 described below, thereby braking the active teeth, so as to brake the wheel 430 through the transmission of the shaft core 410 and the flexible plate 460.

[0066] The motor 700 is connected to the shaft sleeve 420, one end of the motor 700 is connected to the driving gear transmission, and the other end of the motor 700 is provided with a brake mechanism 800. The brake mechanism 800 includes a housing 810, a rotating member 820, a moving disk 830, a static disk 840 and a driving member 850. The inner surface of the housing 810 is provided with a guide rib 860 along the direction of the output shaft of the motor 700. The rotating member 820 is rotatably arranged in the housing 810, and the rotating member 820 is connected to the output shaft of the motor 700, and the outer surface of the rotating member 820 is provided with a limit rib 870 along the direction of the output shaft of the motor 700. The moving disc 830 and the static disc 840 are arranged in the housing 810, and the moving disc 830 and the static disc 840 are sleeved on the rotating member 820 at intervals. The inner circumference of the moving disc 830 is provided with a limit slot 880, and the limit slot 880 is clamped on the limit rib 870. The outer circumference of the static disc 840 is provided with a positioning slot 890, and the positioning slot 890 is clamped on the guide rib 860. The driving member 850 is arranged in the housing 810, and the driving member 850 is suitable for connecting with the static disc 840. The driving member 850 is suitable for driving the static disc 840 to slide along the guide rib 860 so that the static disc 840 and the moving disc 830 are attached to each other to form a brake.

[0067] During the driving process, the motor 700 drives the active gear to rotate, thereby driving the driven gear 450 to rotate. During the rotation of the driven gear 450, the shaft core 410 will be driven to rotate, so that the wheel 430 will rotate through the transmission of the flexible plate 460 to achieve driving. In addition, during the driving process, the static plate 840 will remain stationary under the limiting action of the positioning groove 890 and the guide rib 860, and the dynamic plate 830 will rotate with the output shaft of the motor 700 under the limiting action of the limiting slot 880 and the limiting rib 870, which will not affect the driving process.

[0068] During the braking process, the driving member 850 will push the moving disc 830 and the static disc 840 to approach each other, and the static disc 840 will slide axially under the limiting action of the positioning groove 890 and the guide rib 860. The moving disc 830 will slide axially under the limiting action of the limiting slot 880 and the limiting rib 870, and the axial sliding of the moving disc 830 and the static disc 840 will make the moving disc 830 and the static disc 840 close to each other, thereby forming a braking force on the moving disc 830 to stop the moving disc 830 from rotating. When the moving disc 830 gradually stops rotating, the moving disc 830 can drive the output shaft of the motor 700 to stop rotating, and the wheel 430 is braked through the transmission action of the driving teeth, the driven teeth 450, the shaft core 410 and the flexible plate 460.

[0069] The shaft sleeve 420 is connected to the lower surface of the box beam 230 through the pull plate assembly 500. The pull plate assembly 500 includes four overlapping spring steel sheets with folds in the middle, which can achieve large lateral positioning stiffness and can realize the lateral rolling displacement release of the frame 100 and the wheel drive system 400 through the folds of the pull plate assembly 500 without adding a series of stiffness due to the lateral rolling.

[0070] One side of the shell 810 is fixed to the motor 700 by fasteners, and the other side of the shell 810 is provided with a shell cover 8100, and at least two brake grooves 8110 distributed along the circumferential direction are formed on the shell cover 8100. The driving member 850 is suitable for being installed in the brake groove 8110, and each two adjacent brake grooves 8110 are connected to each other. One of the brake grooves 8110 is provided with an oil hole for oil pressure driving the driving member 850 to operate.

[0071] The driving member 850 is specifically a hydraulic driving mechanism, which is installed in the brake groove 8110, and an oil hole is opened in one of the brake grooves 8110 to connect the oil pressure pipeline to control the action of the driving member 850. Multiple brake grooves 8110 will be installed with multiple brake members, which can ensure balance and stability during braking on the one hand, and can ensure successful braking at multiple points on the other hand.

[0072] The two ends of the shaft core 410 are respectively connected with transition pieces 8120 by interference fit, and the flexible plate 460 is suitable for being installed on the outside of the transition piece 8120 through fasteners. The wheel 430 is an elastic wheel 430, and the wheel 430 is suitable for being connected to the flexible plate 460 through fasteners. The elastic wheel 430 is connected to the flexible plate 460 through fasteners, and the flexible plate 460 is connected to the transition pieces 8120 connected to the two ends of the shaft core 410 through fasteners, so as to realize the transmission between the shaft core 410 and the wheel 430.

[0073] On the other hand, the present invention further provides a rail vehicle, comprising a vehicle body, wherein the vehicle body is provided with the bogie as described above.

[0074] In this embodiment, the aforementioned bogie is installed on the vehicle body, and the load-bearing body 200 and the leaf spring 300 are used to replace the original crossbeam and side beam structure. The structure of the load-bearing body 200 is simple, and the structural form of the leaf spring 300 also makes the weight of the leaf spring 300 much smaller than the weight of the traditional side beam, so that the frame 100 has a significant lightweight effect. The wheel drive system 400 is used to achieve driving and braking, and the wheel drive system 400 can be directly integrated into the shaft sleeve 420, which saves layout space. Compared with the original brake caliper braking, the weight of the brake mechanism 800 can be greatly reduced, which is conducive to the lightweight development of rail vehicles. At the same time, 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, so as to realize the mutual assembly between the traction beam 910, the pin sleeve 920 and the center pin 930. The connecting portion 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 by 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. In order to withstand the lateral load, the free gap 9220 inside the pin sleeve 920 can make the pin sleeve 920 softer in the lateral direction and harder in the longitudinal direction, thereby reducing the constraint on lateral movement within a certain displacement while ensuring the transmission of the longitudinal load, and avoiding the addition of a large lateral stiffness. At the same time, when the lateral displacement exceeds the limit, the two inner walls of the free gap 9220 contact each other to achieve a lateral stop function, thereby avoiding the redundancy of the structural parts of the central traction device 900 and achieving lightweight 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, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions 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 comprises a bearing body and two leaf springs, wherein a center pin channel is formed in the middle of the bearing body, and two mounting channels are formed in the bearing body 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 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 is provided with an assembly channel along the height direction. The outer surface of the traction beam is provided with a connecting portion. The pin sleeve is installed in the assembly channel. A pin hole and two free gaps are provided in the pin sleeve along the height direction. Along the width direction of the rail vehicle, the two free gaps are respectively 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 portion, and the other end of the connecting rod is suitable for being connected to the frame.

2. The bogie according to claim 1, characterized in that: The bearing body comprises: Two box beams are spaced apart and arranged in parallel, each of the box beams is hollow inside and forms the installation channel respectively; A load-bearing beam is disposed between the two box beams, and the center pin channel is formed at the center of the load-bearing beam; The T-shaped reinforcement beam is vertically arranged on the lower surface of the load-bearing beam, and the T-shaped reinforcement beam is respectively connected with the two sides of the two box beams facing each other.

3. The bogie according to claim 2, characterized in that: Empty spring mounting seats are respectively provided on the upper surfaces of the two box beams; The empty spring mounting seat is provided with a mounting protrusion protruding outward in the direction away from the box beam, and the distance between the two empty 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 portion is formed on the lower surface of the inner side of the box beam, and the leaf spring positioning portion is located in the installation channel, wherein a connecting block is provided on the upper surface of the leaf spring, and one of the leaf spring positioning portion and the connecting block is configured with an inwardly concave installation groove, and the other of the leaf spring positioning portion and the connecting block is configured with an outwardly convex protrusion, the protrusion is suitable for being snapped into the installation groove, and the protrusion and the installation groove are respectively configured to be matched cross shapes.

5. The bogie according to claim 1, characterized in that: The number of the connecting parts is four, and the four connecting parts are spaced apart along the circumference of the outer surface of the traction beam, and an angle is formed between each two adjacent connecting parts. The cross section of the free gap is arc-shaped, and the two free gaps are located on the same circumference, wherein each of the free gaps corresponds to two gap ends, and the positions of the four connecting parts correspond to the four gap ends, respectively. A pressure cover is provided under the traction beam, and the pressure cover, the pin sleeve and the center pin are suitable for being fixed to each other by fasteners.

6. The bogie according to claim 2, characterized in that: It also includes a wheel drive system, which includes an axle core, a sleeve and two wheels. The axle core is rotatably installed in the sleeve. A gear box is constructed on the sleeve. A driving tooth is provided in the gear box. The axle core is sleeved with a driven tooth. The driving tooth is externally meshed with the driven tooth. The two wheels are respectively installed at both ends of the sleeve through bearings, and the two wheels are respectively connected to the two ends of the axle core through flexible plates, wherein pads are respectively provided at both ends of each leaf spring, and the pads are connected to the sleeve. The sleeve is also connected to the lower surface of the box beam through a pull plate assembly.

7. The bogie according to claim 6, characterized in that The shaft sleeve is connected with a motor, one end of the motor is connected to the driving gear transmission, and the other end of the motor is provided with a brake mechanism; The braking mechanism comprises: The housing has guide ribs on its inner surface along the direction of the motor output shaft; A rotating member, rotatably disposed in the housing, and connected to the output shaft of the motor, wherein the outer surface of the rotating member is provided with a limiting rib along the direction of the output shaft of the motor; A moving plate and a static plate are arranged in the housing, the moving plate and the static plate are sleeved on the rotating member at intervals, the inner circumference of the moving plate is provided with a limit slot, the limit slot is clamped on the limit rib, and the outer circumference of the static plate is provided with a positioning groove, the positioning groove is clamped on the guide rib; A driving member is disposed in the housing, the driving member is adapted to be connected to the static plate, and the driving member is adapted to drive the static plate to slide along the guide ribs so that the static plate and the dynamic plate are fitted to each other to form a brake.

8. The bogie according to claim 7, characterized in that: One side of the shell is fixed to the motor by fasteners, and the other side of the shell is provided with a shell cover, on which at least two brake grooves distributed along the circumferential direction are formed, and the driving member is suitable for being installed in the brake grooves, and each adjacent two brake grooves are connected to each other, and one of the brake grooves is provided with an oil hole for oil pressure driving the driving member to operate.

9. The bogie according to claim 8, characterized in that Transition pieces are respectively interference-connected at both ends of the shaft core. The flexible plate is suitable for being installed on the outer side of the transition piece through fasteners. The wheel is an elastic wheel and is suitable for being connected to the flexible plate through fasteners.

10. A rail vehicle, characterized in that: It comprises a car body, wherein the car body is provided with a bogie as claimed in any one of claims 1-9.

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