Straddle-type bogie frame and straddle-type monorail vehicle

Abstract

The application provides a straddle type bogie frame and a straddle type monorail vehicle, the straddle type bogie frame comprising a combined beam and a down bending beam, the combined beam comprising a high side beam, a low side beam, a traction beam connecting the high side beam and the low side beam, and an end beam connecting the high side beam and the low side beam, the number of the down bending beams being two, and the two down bending beams being connected with the high side beam and the low side beam respectively, and the combined beam and the down bending beam being connected in a T joint fillet welding and V type butt joint welding mode. The straddle type bogie frame and the straddle type monorail vehicle are formed by combining and welding the combined beam and the down bending beam formed in a split mode, the air chamber is independently formed in the down bending beam, the low side beam and the high side beam are decoupled, the structure is better in stress bearing, and the weld accessibility is better; the combined beam serves as a base, and when the combined beam is combined with the down bending beam, the overall welding deformation is small, the combined beam is not prone to twisting, and the size after welding is easy to control.

Description

Technical Field

[0001] The present invention relates to the technical field of urban rail transit vehicles, and particularly relates to a straddle-type bogie frame and a straddle-type monorail vehicle. Background Art

[0002] A straddle-type monorail vehicle runs on a single track beam, and the track beam is generally made of reinforced concrete or steel structure. Straddle-type monorail transportation is a new type of rail transit system emerging in recent years in China. Monorail vehicles have unique advantages such as low running noise, strong climbing ability, small turning radius, short construction period, and low cost, which can effectively relieve urban traffic congestion problems and have good market prospects.

[0003] The structure of a straddle-type monorail bogie is quite different from that of a traditional subway bogie. The traditional subway bogie is in an "H" shape, while the straddle-type monorail bogie is in a "Ji" shape, with characteristics such as a compact structure, large cross-section change, and strong sense of space. At present, the straddle-type monorail bogie is mainly a welded structure, mainly composed of side beams, end beams, and various mounting seats welded together.

[0004] In the prior art, there are corresponding researches and developments on bogie frames. For example, the patent document with the publication number CN109849959A discloses a bogie frame of a straddle-type monorail vehicle, which includes a traction beam, a cross beam, a first side beam, a second side beam, a motor beam, and several mounting seats. Each of the first side beam and the second side beam forms a sealed cavity inside; the sealed cavity constitutes an additional air chamber for air spring suspension, and the two sealed cavities are not connected to each other; the first side beam and the second side beam are located at both ends of the traction beam and the cross beam. The sealed cavity includes an air spring seat plate, an air spring guide sleeve, a left side plate, a right side plate, a vertical plate, an end plate, a lower plate, and an inner cavity partition plate.

[0005] However, the additional air chambers of the existing structure are integrated on the low side beam and the high side beam, resulting in complex structures of the low side beam and the high side beam. To ensure the quality of the air chamber welds, the "progressive assembly" method needs to be adopted, and the welding accessibility is poor, making it difficult to control welding deformation and distortion.

[0006] In view of this, it is necessary to improve the existing straddle-type bogie frame to solve the above problems. Summary of the Invention

[0007] The purpose of the present invention is to provide a straddle-type bogie frame to solve the problems of poor welding accessibility and difficult control of deformation and distortion of the existing bogie.

[0008] To achieve the above objectives, the present invention provides a straddle-type bogie frame, which includes a composite beam and a lower curved beam. The composite beam includes a high side beam, a low side beam, a traction beam connecting the high side beam and the low side beam, and an end beam connecting the high side beam and the low side beam. There are two lower curved beams, which are respectively connected to the high side beam and the low side beam. The composite beam and the lower curved beam are connected by T-joint fillet weld and V-button weld.

[0009] As a further improvement of the present invention, the lower curved beam includes a left upright plate, a right upright plate spaced apart from the left upright plate, a lower curved beam upper cover plate welded to the left and right upright plates, a lower curved beam lower cover plate welded to the left and right upright plates, an air chamber rib welded to the lower curved beam lower cover plate, a first sealing plate welded to the lower curved beam upper cover plate and the lower curved beam lower cover plate, a second sealing plate welded to the lower curved beam upper cover plate and the air chamber rib, and a covering sealing plate welded to the left and right upright plates. The left upright plate, the right upright plate, the lower curved beam upper cover plate, the lower curved beam lower cover plate, the first sealing plate, the air chamber rib, and the second sealing plate surround and form an air chamber.

[0010] As a further improvement of the present invention, the high side beam includes a motor mounting plate having a motor mounting interface and extending in a vertical direction, a motor outer vertical plate spaced horizontally from the motor mounting plate, a motor upper cover plate surrounding the motor mounting interface and vertically connecting the motor mounting plate and the motor outer vertical plate, a high side beam lower cover plate connected to the bottom of the motor mounting plate, and a high side beam middle cover plate connected to the middle of the motor mounting plate.

[0011] As a further improvement of the present invention, the ends of the motor outer upright plate and the upper cover plate of the lower curved beam are welded in a V-shaped manner in the vertical direction. The cover plate, the left upright plate and the right upright plate are all perpendicular to the lower cover plate of the high side beam and are all welded to the lower cover plate of the high side beam by a T-joint fillet weld.

[0012] As a further improvement of the present invention, the motor mounting plate is an integral forging, and the motor mounting plate is provided with a mounting protrusion that surrounds the motor mounting interface and protrudes toward the low side beam, and a motor mounting hole is provided through the mounting protrusion.

[0013] As a further improvement of the present invention, the low side beam includes an outer vertical plate of the low side beam located on the side away from the high side beam, an inner vertical plate of the low side beam located on the side close to the high side beam, a top cover plate of the low side beam connected to the upper ends of the outer vertical plate and the inner vertical plate of the low side beam, and a bottom cover plate of the low side beam connected to the lower ends of the outer vertical plate and the inner vertical plate of the low side beam.

[0014] As a further improvement of the present invention, the ends of the outer vertical plate of the lower side beam and the upper cover plate of the lower curved beam are welded in a V-shaped manner in the vertical direction. The cover plate, the left vertical plate and the right vertical plate are all perpendicular to the lower cover plate of the lower side beam and are all welded to the lower cover plate of the lower side beam by a T-joint weld.

[0015] As a further improvement of the present invention, the traction beam includes an outer vertical plate of the traction beam located on the side away from the end beam, an inner vertical plate of the traction beam located on the side close to the end beam, a lower cover plate of the traction beam connected to the bottom of the inner vertical plate of the traction beam, and a traction seat.

[0016] As a further improvement of the present invention, the end beam includes an outer end beam plate located on the side away from the traction beam, an inner end beam plate located on the side close to the traction beam, and a lower end beam cover plate connected to the bottom of the inner end beam plate.

[0017] The present invention also provides a straddle-type monorail vehicle, the straddle-type monorail vehicle comprising the straddle-type bogie frame as described above.

[0018] The beneficial effects of the present invention are as follows: The straddle-type bogie frame and straddle-type monorail vehicle of the present invention are formed by separately forming the composite beam and the lower curved beam and then welding them together to form the straddle-type bogie frame. The air chamber is independently formed in the lower curved beam, which decouples the low side beam and the high side beam, resulting in better structural stress and better weld accessibility. When the composite beam serves as the base and is assembled with the lower curved beam, the overall welding deformation is small, it is not easy to twist, and the post-weld dimensions are easy to control. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0020] Figure 1 This is a three-dimensional structural schematic diagram of the straddle-type steering frame of the present invention;

[0021] Figure 2 This is a three-dimensional structural schematic diagram of the straddle-type steering frame of the present invention from another angle;

[0022] Figure 3 yes Figure 2 A magnified structural diagram of region A in the middle;

[0023] Figure 4 This is a schematic diagram of the lower curved beam of the straddle-type bogie frame of the present invention;

[0024] Figure 5 This is a schematic diagram of the lower curved beam of the straddle-type bogie frame of the present invention from another angle.

[0025] Figure 6This is a schematic cross-sectional view of the lower curved beam of the straddle-type bogie frame of the present invention.

[0026] Figure 7 This is a three-dimensional structural schematic diagram of the combined beam of the straddle-type bogie frame of the present invention;

[0027] Figure 8 yes Figure 7 A magnified structural diagram of region B in the middle;

[0028] Figure 9 This is a schematic diagram of the combined beam of the straddle-type bogie frame of the present invention from another angle;

[0029] Figure 10 yes Figure 9 A magnified structural diagram of region C in the middle;

[0030] Figure 11 This is a schematic diagram of the high side beam of the straddle-type bogie frame of the present invention;

[0031] Figure 12 This is a schematic diagram of the high side beam of the straddle-type bogie frame of the present invention from another angle;

[0032] Figure 13 This is a schematic diagram of the low side beam of the straddle-type bogie frame of the present invention;

[0033] Figure 14 This is a schematic diagram of the low side beam structure of the straddle-type bogie frame of the present invention from another angle;

[0034] Figure 15 This is a schematic diagram of the traction beam of the straddle-type bogie frame of the present invention;

[0035] Figure 16 This is a schematic diagram of the traction beam of the straddle-type bogie frame of the present invention from another angle.

[0036] Figure 17 This is a schematic diagram of the traction seat of the straddle-type bogie frame of the present invention;

[0037] Figure 18 This is a schematic diagram of the end beam of the straddle-type bogie frame of the present invention. Detailed Implementation

[0038] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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 invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0041] like Figures 1 to 18 As shown, the straddle-type monorail vehicle of the present invention includes a straddle-type bogie frame 100.

[0042] like Figures 1 to 3 As shown, the straddle-type bogie frame 100 includes a composite beam 1 and two lower curved beams 2. In this embodiment, the composite beam 1 and the lower curved beams 2 are two independent design modules, and each lower curved beam 2 is arranged symmetrically with respect to the longitudinal center of the composite beam 1.

[0043] like Figures 4 to 6 As shown, the lower curved beam 2 includes a left upright plate 21, a right upright plate 22, a lower curved beam upper cover plate 23, a lower curved beam lower cover plate 24, a first sealing plate 25, an air chamber stiffener 26, a second sealing plate 27, multiple reinforcing stiffeners 28, a cover sealing plate 29 welded to the left upright plate 21 and the right upright plate 22, an air spring guide post 20 and an air spring seat plate 201, and a stabilizing wheel mounting seat 202 connected between the left upright plate 21 and the right upright plate 22.

[0044] In this embodiment, the left upright plate 21 and the right upright plate 22 are relative to the forward direction of the straddle-type monorail vehicle, and the forward and backward directions described in this embodiment are all the forward and backward directions of the straddle-type monorail vehicle.

[0045] In this embodiment, both the left upright plate 21 and the right upright plate 22 extend vertically, but both are irregularly shaped, generally Y-shaped in the front-to-back direction. The left upright plate 21 and the right upright plate 22 are spaced apart in the horizontal direction.

[0046] The upper cover plate 23 of the lower curved beam is connected to the upper ends of the left upright plate 21 and the right upright plate 22, and the upper cover plate 23 of the lower curved beam includes a horizontal upper cover 231 extending in the horizontal direction and an inclined upper cover 232 connected to the horizontal upper cover 231 and extending upward in the inclined direction. In this embodiment, the width of the upper cover plate 23 of the lower curved beam in the left-right direction is slightly larger than the interval between the left upright plate 21 and the right upright plate 22, and the left upright plate 21 and the right upright plate 22 are vertically welded to the upper cover plate 23 of the lower curved beam.

[0047] The top of the inclined cover 232 extends vertically.

[0048] The upper cover plate 23 of the lower curved beam is connected to the lower ends of the left upright plate 21 and the right upright plate 22, and the lower cover plate 24 of the lower curved beam includes a horizontal lower cover 241 extending in the horizontal direction and an inclined lower cover 242 connected to the horizontal lower cover 241 and extending downward in the inclined direction. In this embodiment, the width of the lower cover plate 24 of the lower curved beam in the left-right direction is slightly larger than the interval between the left upright plate 21 and the right upright plate 22, and the left upright plate 21 and the right upright plate 22 are vertically welded to the lower cover plate 24 of the lower curved beam.

[0049] The bottom of the inclined lower cover 242 extends in a vertical direction.

[0050] The first sealing plate 25 is connected to the horizontal upper cover 231, the horizontal lower cover 241, the left vertical plate 21 and the right vertical plate 22. In this embodiment, the first sealing plate 25 is vertically welded to the horizontal upper cover 231, the horizontal lower cover 241, the left vertical plate 21 and the right vertical plate 22.

[0051] The air chamber stiffener 26 is connected to the inclined lower cover 242, the left vertical plate 21, and the right vertical plate 22. Because the bottom of the inclined lower cover 242 extends vertically, in this embodiment, the air chamber stiffener 26 is vertically welded to the lower end of the inclined lower cover 242, the left vertical plate 21, and the right vertical plate 22. In this embodiment, the air chamber stiffener 26 replaces the original stabilizer wheel mounting seat to provide a sealing function, reducing the manufacturing difficulty of the stabilizer wheel mounting seat 202.

[0052] The second sealing plate 27 is connected to the inclined upper cover 232, the air chamber rib plate 26, the left upright plate 21, and the right upright plate 22. In this embodiment, the second sealing plate 27 is vertically welded to the air chamber rib plate 26, the left upright plate 21, and the right upright plate 22, while it is inclinedly welded to the inclined upper cover 232.

[0053] In this embodiment, both the first sealing plate 25 and the second sealing plate 27 extend in the vertical direction.

[0054] The left upright plate 21, right upright plate 22, upper cover plate 23 of the lower curved beam, lower cover plate 24 of the lower curved beam, first sealing plate 25, air chamber stiffener 26 and second sealing plate 27 are arranged to form an air chamber.

[0055] For the welds of the air chamber, an airtightness test is required. This involves filling the inner cavity with compressed air at a certain pressure, maintaining the pressure for 15-20 minutes, and then applying soapy water to the weld, ensuring no air bubbles are generated. In the existing structure, one side of the air chamber is formed by connecting the lower curved upper cover and the obscuring sealing plate. After the weld of the inclined plate is completed, the lower curved beam lower cover plate 24 is welded, which obscures the weld of the inclined plate, making airtightness testing impossible and creating a blind spot. In this embodiment, the structure is optimized by setting the second sealing plate 27 to directly connect the lower curved beam upper cover plate 23 and the air chamber stiffener 26. This reduces manufacturing difficulty while ensuring structural strength and achieves 100% inspection of all welds in the air chamber.

[0056] The horizontal upper cover 231 has an air hole communicating with the air chamber. The air spring guide post 20 is inserted into the air hole and protrudes vertically into the air chamber. The bottom of the air spring guide post 20 has a connecting hole 203, the size of which is smaller than the air hole. This arrangement makes the air spring guide post 20 form a step, which facilitates sealing the air hole. This also prevents machining chips from entering the air chamber when installing process plugs during the overall frame machining.

[0057] The lower curved beam upper cover plate 23 is an integrally formed bent plate 1182. In this embodiment, the irregular forging in the existing structure is replaced with a bent part, reducing manufacturing difficulty and procurement costs. In the existing structure, the horizontal section is made thicker to facilitate grinding during processing and improve flatness. In this embodiment, a hollow spring seat plate 201 is provided around the air hole. The hollow spring seat plate 201 is welded to the horizontal upper cover 231, and flatness processing can be performed on the hollow spring seat plate 201.

[0058] The reinforcing rib plate 28 is welded to the left upright plate 21 and the right upright plate 22. In this embodiment, there are multiple reinforcing rib plates 28. In addition to being welded to the left upright plate 21 and the right upright plate 22, one side of the reinforcing rib plate 28 can also be connected to the lower curved beam upper cover plate 23, the second sealing plate 27, the air chamber rib plate 26, the stabilizing wheel mounting seat 202, etc., as needed.

[0059] The left vertical plate 21, the right vertical plate 22, the upper cover plate of the lower bent beam 23, the lower cover plate of the lower bent beam 24, the first sealing plate 25, the air chamber rib plate 26 and the second sealing plate 27 are all connected by welding. And except that the second sealing plate 27 is inclined and welded to the inclined upper cover 232, the rest of the structures are vertically welded.

[0060] The covering sealing plate 29 is located on the side of the second sealing plate 27 away from the first sealing plate 25, and an airtight detection hole is opened on the covering sealing plate 29. The airtight detection hole is a round hole for later detection and maintenance.

[0061] The bottoms of the left vertical plate 21 and the right vertical plate 22 extend towards the side away from the first sealing plate 25, and the stabilizer wheel mounting seat 202 is located at the bottoms of the left vertical plate 21 and the right vertical plate 22. In this embodiment, since the air chamber rib plate 26 is provided to achieve a sealing effect, the stabilizer wheel mounting seat 202 only needs to bear the impact vibration of the stabilizer wheel, and the force is simple, so the volume of the stabilizer wheel mounting seat 202 can be reduced. In this embodiment, one of the reinforcing rib plates 28 is welded to the stabilizer wheel mounting seat 202 and the air chamber rib plate 26, so that the impact vibration received by the stabilizer wheel mounting seat 202 can be transmitted to the two left vertical plate 21 and the right vertical plate 22. This design decouples the stabilizer wheel mounting seat 202 from the air chamber, simplifies the structure, and improves the bearing strength of the stabilizer wheel mounting seat 202.

[0062] As Figures 7 to 10 shown, the combined beam 1 includes a high side beam 11, a low side beam 12, a traction beam 13 connecting the high side beam 11 and the low side beam 12, an end beam 14 connecting the high side beam 11 and the low side beam 12, and a plurality of guide wheel mounting seats 15.

[0063] Among them, the high side beam 11 and the low side beam 12 are arranged at opposite ends, and the traction beam 13 and the end beam 14 are arranged at opposite ends. Such an arrangement makes the combined beam 1 have a "square" structure. This "square" box beam is more stable in structure and easier to withstand greater impacts compared with the existing "cross" beam structure; when the "square" structure combined beam 1 is used as a base and is paired with the lower bent beam 2, the overall welding deformation is small.

[0064] The two lower bent beams 2 are respectively connected to the high side beam 11 and the low side beam 12, and the connection method between the combined beam 1 and the lower bent beam 2 is T-joint fillet welding and V-groove butt welding.

[0065] As Figures 11 to 12As shown, the high side beam 11 includes a motor mounting plate 111 with a motor mounting interface extending vertically, a motor outer upright plate 112 spaced horizontally from the motor mounting plate 111, a motor upper cover plate 113 surrounding the motor mounting interface and vertically connecting the motor mounting plate 111 and the motor outer upright plate 112, a high side beam lower cover plate 114 connected to the bottom of the motor mounting plate 111, a high side beam middle cover plate 115 connected to the middle of the motor mounting plate 111, a connecting forging 116, two motor connecting plates 117, a high side beam outer upright plate 118 welded to the motor upper cover plate 113, multiple reinforcing ribs 119 connecting the motor mounting plate 111, the motor outer upright plate 112 and the motor upper cover plate 113, and a clamp mounting seat 110 welded to the side of the motor outer upright plate 112 away from the motor mounting plate 111.

[0066] In the existing structure, a high-end beam and a motor beam are set up, with the high-end beam serving as the load-bearing base for the motor beam. The main load-bearing components, the motor mounting plate and the lower cover plate, are connected by welds that are very close together, which can easily generate additional welding stress. There are both lap welds and T-joint welds at the corners, and the corners are small in size, resulting in large welding heat input, large welding deformation, and easy welding defects. These are the weak points in the critical load-bearing locations.

[0067] In this embodiment, the original motor beam and high beam are integrated using a high side beam 11 to form a unified closed box beam, resulting in better overall load-bearing strength. The motor mounting plate 111 is connected to the motor mounting plate 117, the motor outer upright plate 112, and the high side beam middle cover plate 115 through two motor connecting plates 117, which makes the structure compact, optimizes the connection method of the weld, eliminates weak points at the stress position, and ensures reliable structural strength. The distance between the main stress-bearing component, the motor mounting plate 111, and the lower cover plate 114 of the high side beam is increased to reduce the generation of additional welding stress.

[0068] The connecting forging 116 includes a first connecting surface 1161 and a second connecting surface 1162 that are perpendicular to each other. The first connecting surface 1161 is welded to the side of the motor mounting plate 111, and the second connecting surface 1162 is welded to the middle cover plate 115 of the high side beam. In this embodiment, by setting the connecting forging 116 to be welded to the motor mounting plate 111, i.e., the middle cover plate 115 of the high side beam, the welding strength is improved, the installation is simplified, and stress concentration is avoided.

[0069] The motor mounting plate 111 is an integral forging. The motor mounting plate 111 is provided with a mounting protrusion that surrounds the motor mounting interface and protrudes toward the low side beam 12. The mounting protrusion is provided with a motor mounting hole for mounting the motor.

[0070] The two motor connecting plates 117 are respectively connected to both sides of the motor mounting plate 111. The upper and lower ends of the motor connecting plates 117 are respectively connected to the middle cover plate 115 and the lower cover plate 114 of the high side beam. In this embodiment, the motor mounting plate 111 is a forging, which is costly. Separating the two sides from the motor connecting plates 117 and the motor mounting plate 111 can reduce the cost of the motor mounting plate 111 and improve its strength.

[0071] The motor mounting plate 111 is connected to the motor connecting plate 117 and the connecting forging 116 through an X-shaped weld to form the inner vertical plate of the high side beam 11. While meeting the structural strength requirements, the structure is simplified and the welding process is simple.

[0072] In this embodiment, the clamp mounting base 110 is directly welded to the outer vertical plate 112 of the motor, and the lower end of the clamp mounting base 110 is welded to the upper cover plate 113 of the motor. Compared with the existing structure, the reinforcing plate is eliminated, the structure is compact, and the connection strength is reliable.

[0073] The outer vertical plate 118 of the high side beam includes a flat plate 1181 spaced horizontally from the motor mounting plate 111, and a bent plate 1182 connecting the flat plate 1181 and the motor connecting plate 117. The outer vertical plate 118 of the high side beam is a symmetrical open-type bent plate, and the two ends are provided with bevels for welding connection.

[0074] The lower cover plate 114 of the high side beam is welded to the inner side of the outer vertical plate 118 of the high side beam.

[0075] The motor mounting plate 111, motor connecting plate 117, connecting forging 116, high side beam lower cover plate 114, high side beam outer upright plate 118, motor upper cover plate 113, high side beam middle cover plate 115, and high side beam lower cover plate 114 constitute a closed inner cavity, and the inner cavity is provided with several reinforcing plates.

[0076] The reinforcing rib 119 is disposed between the motor mounting plate 111 and the motor outer upright plate 112, and a drainage hole is provided therein.

[0077] The motor top cover 113, the high side beam middle cover 115, the motor top cover 113, the motor outer vertical plate 112, and the reinforcing rib 119 constitute an open "cylindrical" structure, which is simple to install and has reliable structural strength.

[0078] A weight-reducing structure is provided in the middle area of ​​the outer vertical plate 118 of the high side beam.

[0079] The ends of the motor outer upright plate 112 and the lower curved beam upper cover plate 23 are welded in a V-shape along the vertical direction. The cover plate 29, the left upright plate 21 and the right upright plate 22 are all perpendicular to the high side beam lower cover plate 114 and are all welded to the high side beam lower cover plate 114 by a T-joint fillet weld.

[0080] like Figures 13 to 14 As shown, the low side beam 12 includes an outer vertical plate 121 located on the side away from the high side beam 11, an inner vertical plate 122 located on the side close to the high side beam 11, an upper cover plate 123 connected to the upper ends of the outer vertical plate 121 and the inner vertical plate 122, and a lower cover plate 124 connected to the lower ends of the outer vertical plate 121 and the inner vertical plate 122.

[0081] The outer vertical plate 121 of the low side beam is a symmetrical open-type bent plate, including a flat part 1211 and a bent part 1212, with a bevel at the end, and the bent part 1212 is directly welded to the outer inner vertical plate.

[0082] The lower cover plate 124 of the lower side beam is welded to the inner side of the outer vertical plate 121 of the lower side beam; the inner vertical plate 122 of the lower side beam is vertically welded to the lower cover plate 124 of the lower side beam, and the upper end face of the inner vertical plate 122 of the lower side beam is flush with the end face of the outer vertical plate 121 of the lower side beam; the upper cover plate 123 of the lower side beam is welded to the end faces of the outer vertical plate 121 and the inner vertical plate 122 of the lower side beam.

[0083] The lower side beam upper cover plate 123, lower side beam lower cover plate 124, lower side beam outer vertical plate 121, and lower side beam inner vertical plate 122 constitute a closed inner cavity, and the inner cavity is provided with several reinforcing plates.

[0084] The lower side beam upper cover plate 123 extends inward at its end. The lower side beam upper cover plate 123 extends outward in the middle. A weight-reducing structure is provided in the middle area of ​​the lower side beam outer vertical plate 121.

[0085] The ends of the outer vertical plate 121 of the lower side beam and the upper cover plate 23 of the lower curved beam are welded in a V-shape along the vertical direction. The cover plate 29, the left vertical plate 21 and the right vertical plate 22 are all perpendicular to the lower cover plate 124 of the lower side beam and are all welded to the lower cover plate 124 of the lower side beam by a T-joint weld.

[0086] like Figure 7 As shown, multiple guide wheel mounting seats 15 are welded and fixed to the high side beam 11 or the low side beam 12. Each guide wheel mounting seat 15 includes a seat body and at least two welding plates 152 connected to the seat body 151. The seat body 151 and the welding plates 152 are welded to the outer side of the high side beam 11 or the low side beam 12. The inner side of the high side beam 11 or the low side beam 12 is provided with internal stiffening plates adjacent to the guide wheel mounting seats 15.

[0087] In this embodiment, there are four guide wheel mounting seats 15, with two welded to each of the high side beam 11 and the low side beam 12. Furthermore, when the guide wheel mounting seats 15 are welded to the high side beam 11, they are also welded to the bent plate 1182; and when the guide wheel mounting seats 15 are welded to the low side beam 12, they are also welded to the bent portion 1212. The bent portion 1212 and the bent plate 1182 are arc-shaped, and the welding plate 152 is also arc-shaped.

[0088] The guide wheel mounting base 15 has an optimized structural design. By setting two welding plates 152 to form a double arc weld, the reliability of the connection structure is enhanced while reducing weight. The box beam cavity in contact with it is equipped with internal stiffeners, which simplifies the structure, ensures the compactness of the structure, and improves the load-bearing strength of the overall structure.

[0089] like Figures 15 to 17 As shown, the traction beam 13 includes an outer traction beam plate 131 located on the side away from the end beam 14, an inner traction beam plate 132 located on the side close to the end beam 14, a lower traction beam cover plate 133 connected to the bottom of the inner traction beam plate 132, a traction upper cover plate 134 welded to the inner traction beam plate 132 and the outer traction beam plate 131, and a traction seat 135.

[0090] The traction seat 135 includes a connecting seat body 1351 and a traction part 1352 disposed on the side of the connecting seat body 1351 away from the end beam 14. The outer vertical plate 131 of the traction beam is provided with a first clearance groove for the connecting seat body 1351 to pass through, and the inner vertical plate 132 of the traction beam is provided with a second clearance groove for the connecting seat body 1351 to pass through.

[0091] The bottom of the outer vertical plate 131 of the traction beam is lower than the lower cover plate 133 of the traction beam. The side of the connecting seat 1351 connected to the traction part 1352 is provided with a connecting surface 1353. The connecting surface 1353 is coplanar with the outer vertical plate 131 of the traction beam in the vertical direction, and its bottom end is flush with the bottom end of the outer vertical plate 131 of the traction beam. The side of the traction connecting part facing the end beam 14 is coplanar with the inner vertical plate 132 of the traction beam.

[0092] In this embodiment, by setting the connecting seat 1351 to be connected to the traction part 1352 in the horizontal direction, the connecting seat 1351 can be welded and fixed to the outer vertical plate 131 and the inner vertical plate 132 of the traction beam. This reduces the likelihood of additional stress, minimizes the risk of weld seam flaring, and prevents welding defects. The overall strength is reliable, the structure is compact, and weld seam flaring is eliminated. The connecting seat is inverted U-shaped to reduce weight without affecting welding strength.

[0093] In this embodiment, one end of the traction upper cover plate 134 is welded to the middle cover plate 115 of the high side beam and the connecting forging 116 in a horizontal direction, and the other end is welded to the upper cover plate 123 of the low side beam in a horizontal direction.

[0094] The two ends of the lower cover plate 133 of the traction beam are respectively welded to the lower cover plate 114 of the high side beam and the lower cover plate 124 of the low side beam in the horizontal direction.

[0095] The two ends of the outer vertical plate 131 of the traction beam are respectively welded to the bent plate 1182 of the outer vertical plate 118 of the high side beam and the bent part 1212 of the outer vertical plate 121 of the low side beam in the horizontal direction.

[0096] The two ends of the inner vertical plate 132 of the traction beam are welded to the motor connecting plate 117 and the inner vertical plate 122 of the lower side beam, respectively.

[0097] like Figure 18 As shown, the end beam 14 includes an outer end beam plate 141 located on the side away from the traction beam 13, an inner end beam plate 142 located on the side close to the traction beam 13, a lower end beam cover plate 143 connected to the bottom of the inner end beam plate 142, and an upper end beam cover plate 144 connected to the top of the outer end beam plate 141 and the inner end beam plate 142.

[0098] In this embodiment, one end of the end beam cover plate 144 is welded to the high side beam middle cover plate 115 and the connecting forging 116 in a horizontal direction, and the other end is welded to the low side beam cover plate 123 in a horizontal direction.

[0099] The two ends of the end beam lower cover plate 143 are respectively welded to the high side beam lower cover plate 114 and the low side beam lower cover plate 124 in the horizontal direction.

[0100] The two ends of the end beam outer plate 141 are respectively welded to the bent plate 1182 of the high side beam outer plate 118 and the bent part 1212 of the low side beam outer plate 121 in the horizontal direction.

[0101] The two ends of the inner vertical plate 142 of the end beam are respectively welded to the motor connecting plate 117 and the inner vertical plate 122 of the lower side beam.

[0102] The high side beam 11 is connected to the traction beam 13 and the end beam 14 by V-shaped butt welds and T-shaped fillet welds, and the low side beam 12 is connected to the traction beam 13 and the end beam 14 by V-shaped butt welds and T-shaped fillet welds.

[0103] The straddle-type bogie frame 100 and straddle-type monorail vehicle of the present invention are formed by separately forming the composite beam 1 and the lower curved beam 2 and then welding them together. The air chamber is independently formed in the lower curved beam 2, decoupling the low side beam 12 and the high side beam 11, resulting in better structural stress and improved weld accessibility. The composite beam 1 serves as a base, and when assembled with the lower curved beam 2, the overall welding deformation is small, it is not prone to twisting, and the post-weld dimensions are easy to control. The composite beam 1 of the present invention consists of four modules: the low side beam 12, the high side beam 11, the traction beam 13, and the end beam 14. It is easy to assemble in the horizontal and vertical directions, with small welding deformation. The motor beam is integrated onto the high side beam 11, forming a unified closed box beam, which improves the overall load-bearing strength. The distance between the weld seam connecting the main load-bearing component, the motor mounting plate 111, and the lower cover plate 114 of the high side beam is increased, reducing the generation of additional welding stress. The lower bending beam 2 of the present invention is provided with a second sealing plate 27 and a gas chamber stiffener 26 to replace the original partition plate, which reduces the manufacturing difficulty while ensuring structural strength and realizes 100% inspection of all welds in the gas chamber.

[0104] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0105] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A bogie frame, characterized by: The straddle-type bogie frame includes a composite beam and a lower curved beam. The composite beam includes a high side beam, a low side beam, a traction beam connecting the high and low side beams, and an end beam connecting the high and low side beams. There are two lower curved beams, which are respectively connected to the high and low side beams. The composite beam and the lower curved beams are connected by T-joint fillet welds and V-button welds. The lower curved beam includes a left upright plate, a right upright plate spaced apart from the left upright plate, and is welded to the left and right upright plates. The lower curved beam upper cover plate, the lower curved beam lower cover plate welded to the left and right upright plates, the air chamber stiffener welded to the lower curved beam lower cover plate, the first sealing plate welded to the lower curved beam upper cover plate and the lower curved beam lower cover plate, the second sealing plate welded to the lower curved beam upper cover plate and the air chamber stiffener, and the covering sealing plate welded to the left and right upright plates, together with the left upright plate, the right upright plate, the lower curved beam upper cover plate, the lower curved beam lower cover plate, the first sealing plate, the air chamber stiffener, and the second sealing plate, form an air chamber.

2. The bogie frame according to claim 1, characterized in that: The high side beam includes a motor mounting plate with a motor mounting interface extending vertically, a motor outer vertical plate spaced horizontally from the motor mounting plate, a motor upper cover plate surrounding the motor mounting interface and vertically connecting the motor mounting plate and the motor outer vertical plate, a high side beam lower cover plate connected to the bottom of the motor mounting plate, and a high side beam middle cover plate connected to the middle of the motor mounting plate.

3. The bogie frame according to claim 2, wherein: The ends of the motor outer vertical plate and the upper cover plate of the lower curved beam are welded together in a V-shape in the vertical direction. The cover plate, left vertical plate and right vertical plate are all perpendicular to the lower cover plate of the high side beam and are all welded to the lower cover plate of the high side beam by a T-joint fillet weld.

4. The bogie frame according to claim 2, wherein: The motor mounting plate is an integral forging. The motor mounting plate is provided with a mounting protrusion that surrounds the motor mounting interface and protrudes toward the low side beam. The mounting protrusion is provided with a motor mounting hole.

5. The bogie frame according to claim 2, wherein: The low side beam includes an outer vertical plate located on the side away from the high side beam, an inner vertical plate located on the side closer to the high side beam, an upper cover plate of the low side beam connected to the upper ends of the outer vertical plate and the inner vertical plate, and a lower cover plate of the low side beam connected to the lower ends of the outer vertical plate and the inner vertical plate.

6. The bogie frame according to claim 5, wherein: The ends of the outer vertical plate of the lower side beam and the upper cover plate of the lower curved beam are welded together in a V-shaped manner in the vertical direction. The cover plate, the left vertical plate and the right vertical plate are all perpendicular to the lower cover plate of the lower side beam and are all welded to the lower cover plate of the lower side beam by a T-joint weld.

7. The bogie frame according to claim 1, wherein: The traction beam includes an outer vertical plate located on the side away from the end beam, an inner vertical plate located on the side closer to the end beam, a lower cover plate of the traction beam connected to the bottom of the inner vertical plate, and a traction seat.

8. The bogie frame according to claim 1, wherein: The end beam includes an outer vertical plate located on the side away from the traction beam, an inner vertical plate located on the side closer to the traction beam, and a lower cover plate connected to the bottom of the inner vertical plate.

9. A straddle-type monorail vehicle, characterized by: The straddle-type monorail vehicle includes a straddle-type bogie frame as described in any one of claims 1-8.

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