Composite beam for bogie and straddle type bogie frame

Abstract

The invention provides a composite beam for a bogie and a straddle type bogie framework, which comprise a high side beam, a low side beam, a traction beam for connecting the high side beam and the low side beam, and an end beam for connecting the high side beam and the low side beam, the high side beam comprises a motor mounting plate, a motor outer vertical plate and a motor upper cover plate, wherein the motor mounting plate is provided with a motor mounting connector and extends in the vertical direction, the motor outer vertical plate and the motor mounting plate are arranged in a spaced mode in the horizontal direction, and the motor upper cover plate surrounds the motor mounting connector and is perpendicularly connected with the motor mounting plate and the motor outer vertical plate. The high side beam lower cover plate is connected with the bottom of the motor mounting plate, and the high side beam middle cover plate is connected with the middle of the motor mounting plate. The composite beam for the bogie is easy to assemble in the horizontal direction and the vertical direction and small in welding deformation, the motor beam is integrated to the high side beam, the overall bearing strength is better, the connecting weld joint distance between the main stress component motor mounting plate and the high side beam lower cover plate is increased, and generation of additional welding additional stress is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of urban rail transit vehicles, and in particular to a combined beam for a bogie and a straddle-type bogie frame. Background Art

[0002] Straddle-type monorail vehicles operate on a single track beam, typically constructed of reinforced concrete or steel. A newly emerging rail transit system in China, straddle-type monorails offer unique advantages such as low operating noise, strong gradeability, a small turning radius, a short construction period, and low cost. They effectively alleviate urban traffic congestion and hold promising market prospects.

[0003] The straddle-type monorail structure differs significantly from the traditional subway structure. While the traditional subway structure is H-shaped, the straddle-type monorail structure is shaped like a "J." This structure features a compact structure, a wide range of cross-sections, and a strong sense of space. Currently, the straddle-type monorail structure is primarily a welded structure, consisting primarily of side beams, end beams, and various mounting brackets.

[0004] Research and development of corresponding bogie frames are already underway in the prior art. For example, patent publication number CN109849959A discloses a bogie frame for a straddle-type monorail vehicle, comprising a traction beam, a crossbeam, a first side beam, a second side beam, a motor beam, and several mounting seats. The first and second side beams each have a sealed cavity formed therein; the sealed cavity serves as an additional air chamber for the air spring suspension and is not interconnected. The first and second side beams are located at either end of the traction beam and crossbeam. The sealed cavity comprises 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.

[0005] However, in this solution, a motor beam is provided for installing the traction motor; the motor beam is welded to the second side beam, and the second side beam serves as the bearing base of the motor beam; the connection welds between the motor mounting plate, the main load-bearing component, and the lower cover plate are very close, which easily generates additional welding stress; there are both lap welds and T-joint fillet welds at the corners, and the corners are small in size, with large welding heat input and welding deformation, and are prone to welding defects, making them weak points at key load-bearing positions.

[0006] In view of this, it is necessary to improve the existing composite beam used for bogies to solve the above problems. Summary of the Invention

[0007] The object of the present invention is to provide a composite beam for a bogie, so as to solve the problem that welding defects are easily present at the motor beam of the existing bogie components and the stress-bearing position is weak.

[0008] To achieve the above-mentioned objectives, the present invention provides a combined beam for a bogie, wherein the combined beam for the bogie 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. The high side beam includes a motor mounting plate provided with a motor mounting interface and extending in a vertical direction, a motor outer plate spaced apart from the motor mounting plate in a horizontal direction, a motor upper cover plate surrounding the motor mounting interface and vertically connecting the motor mounting plate and the motor outer plate, a high side beam lower cover plate connected to the bottom of the motor mounting plate, a high side beam middle cover plate connected to the middle of the motor mounting plate, and a connecting forging, wherein the connecting forging includes a first connecting surface and a second connecting surface perpendicular to each other, the first connecting surface is welded to the side of the motor mounting plate, and the second connecting surface is welded to the high side beam middle cover plate.

[0009] As a further improvement of the present invention, the high side beam also includes two motor connecting plates, which are respectively connected to the two sides of the motor mounting plate, and the upper end and lower end of the motor connecting plate are respectively connected to the high side beam middle cover plate and the high side beam lower cover plate.

[0010] As a further improvement of the present invention, the high side beam also includes a high side beam outer plate welded to the motor upper cover plate, and the high side beam outer plate includes a flat plate spaced horizontally from the motor mounting plate and a bent plate connecting the flat plate and the motor connecting plate.

[0011] As a further improvement of the present invention, the high side beam further includes a plurality of reinforcing ribs connecting the motor mounting plate, the motor outer plate and the motor upper cover plate.

[0012] As a further improvement of the present invention, the high side beam further comprises a clamp mounting seat welded to a side of the motor outer plate away from the motor mounting plate.

[0013] As a further improvement of the present invention, the combined beam for the bogie also includes a plurality of guide wheel mounting seats, and the plurality of guide wheel mounting seats are welded and fixed on the high side beam or the low side beam, and the guide wheel mounting seat includes a seat body and at least two welding plates connected to the seat body, and the seat body and the welding plates are welded to the outside of the high side beam or the low side beam, and the inner side of the high side beam or the low side beam is provided with an internal rib plate adjacent to the guide wheel mounting seat.

[0014] As a further improvement of the present invention, the high side beam is connected to the traction beam and the end beam by V-shaped butt welding and T-joint fillet welding, and the low side beam is connected to the traction beam and the end beam by V-shaped butt welding and T-joint fillet welding.

[0015] As a further improvement of the present invention, the traction beam includes a traction beam outer plate located on the side away from the end beam, a traction beam inner plate located on the side close to the end beam, a traction beam lower cover connected to the bottom of the traction beam inner plate, and a traction seat. The traction seat includes a connecting seat body and a traction part arranged on the side of the connecting seat body away from the end beam. The traction beam outer plate is provided with a first clearance groove for the connecting seat body to pass through, and the traction beam inner plate is provided with a second clearance groove for the connecting seat body to pass through.

[0016] As a further improvement of the present invention, the bottom of the traction beam outer plate is lower than the traction beam lower cover plate, and a connecting surface is provided on the side where the connecting seat is connected to the traction part. The connecting surface is coplanar with the traction beam outer plate in the vertical direction, and the bottom end is flush with the bottom end of the traction beam outer plate, and the side of the traction connection part facing the end beam is coplanar with the traction beam inner plate.

[0017] The present invention also provides a straddle-type bogie frame, which comprises the combined beam and the lower bent beam for the bogie as described above.

[0018] The beneficial effects of the present invention are as follows: the combined beam for the bogie of the present invention is composed of four modules, namely, a low side beam, a high side beam, a traction beam, and an end beam. It is easy to assemble in the horizontal and vertical directions, and has small welding deformation. The motor beam is integrated into the high side beam to form a unified closed box beam, and the overall bearing strength is better. The distance between the connecting welds of the motor mounting plate, the main load-bearing component, and the lower cover plate of the high side beam is increased, thereby reducing the generation of additional stress from additional welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the straddle-type bogie frame of the present invention;

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

[0022] Figure 3 yes Figure 2 Schematic diagram of the enlarged structure of area A in the middle;

[0023] Figure 4 1. It is a structural schematic diagram of the lower bending beam of the straddle-type bogie frame of the present invention;

[0024] Figure 5 2. It is a schematic structural diagram of the lower bent beam of the straddle-type bogie frame of the present invention from another angle;

[0025] Figure 6 2 is a schematic cross-sectional view of a lower bent beam of a straddle-type bogie frame according to the present invention;

[0026] Figure 7 1. It is a schematic diagram of the three-dimensional structure of a combined beam used for a bogie of a straddle-type bogie frame of the present invention;

[0027] Figure 8 yes Figure 7 Schematic diagram of the enlarged structure of the middle area B;

[0028] Figure 9 2. It is a schematic structural diagram of a composite beam for a bogie of a straddle-type bogie frame according to the present invention from another angle;

[0029] Figure 10 yes Figure 9 Schematic diagram of the enlarged structure of the middle area C;

[0030] Figure 11 2. It is a schematic structural diagram of the high side beam of the straddle-type bogie frame of the present invention;

[0031] Figure 12 2. It is a schematic structural diagram of the high side beam of the straddle-type bogie frame of the present invention from another angle;

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

[0033] Figure 14 2. It is a schematic structural diagram of the low side beam of the straddle-type bogie frame of the present invention from another angle;

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

[0035] Figure 16 2. It is a schematic structural diagram of the traction beam of the straddle-type bogie frame of the present invention from another angle;

[0036] Figure 17 It is a schematic structural diagram of the fifth wheel of the straddle-type bogie frame of the present invention;

[0037] Figure 18 It is a structural schematic diagram of the end beam of the straddle-type bogie frame of the present invention. DETAILED DESCRIPTION

[0038] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0039] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present 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 the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present 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 for the bogie and a lower bow beam 2, with two lower bow beams 2. In this embodiment, the composite beam 1 for the bogie and the lower bow beam 2 are two independent design modules, and each lower bow beam 2 is symmetrically arranged about the longitudinal center of the composite beam 1 for the bogie.

[0043] like Figures 4 to 6 As shown, the lower curved beam 2 includes a left vertical plate 21, a right vertical plate 22, a lower curved beam upper cover plate 23, a lower curved beam lower cover plate 24, a first closing plate 25, an air chamber rib plate 26, a second closing plate 27, a plurality of reinforcing rib plates 28, a covering closing plate 29 welded to the left vertical plate 21 and the right vertical plate 22, an empty spring guide column 20 and an empty spring seat plate 201, and a stabilizing wheel mounting seat 202 connected between the left vertical plate 21 and the right vertical plate 22.

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

[0045] In this embodiment, the left vertical plate 21 and the right vertical plate 22 both extend in the vertical direction, but are of special-shaped structures, generally forming a Y-shape along the front-back direction. The left vertical plate 21 and the right vertical plate 22 are spaced apart in the horizontal direction.

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

[0047] The top of the inclined upper cover 232 extends in the vertical direction.

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

[0049] The bottom of the inclined lower cover 242 extends in the 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 ribs 26 are connected to the inclined lower cover 242, the left upright plate 21, and the right upright plate 22. Because the bottom of the inclined lower cover 242 extends vertically, in this embodiment, the air chamber ribs 26 are vertically welded to the lower end of the inclined lower cover 242, the left upright plate 21, and the right upright plate 22. In this embodiment, the air chamber ribs 26 replace the stabilizing wheel mounting seat of the original structure and provide a seal, reducing the difficulty of manufacturing the stabilizing wheel mounting seat 202.

[0052] The second sealing plate 27 is connected to the inclined upper cover 232, the air chamber rib 26, the left vertical plate 21, and the right vertical plate 22. In this embodiment, the second sealing plate 27 is connected to the air chamber rib 26, the left vertical plate 21, and the right vertical plate 22 by vertical welding, and is connected to the inclined upper cover 232 by oblique welding.

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

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

[0055] For the welds of the air chamber, an air tightness test must be performed, that is, compressed air of a certain pressure is filled into the inner cavity, the pressure is maintained for 15 to 20 minutes, and the welds are coated with soapy water, and no bubbles are allowed to be generated. In the existing structure, one side of the air chamber is formed by connecting the lower curved upper cover and the covering sealing plate. After the welding of the connecting welds of the inclined plate is completed, the lower curved beam lower cover plate 24 is welded. This causes the connecting welds of the inclined plate to be blocked, making it impossible to perform an air tightness test, and there is a blind spot in the detection. In this embodiment, the structure is optimized, and the second sealing plate 27 is set to directly connect the lower curved beam upper cover plate 23 and the air chamber rib plate 26. While ensuring the structural strength, the manufacturing difficulty is reduced, and 100% detection of all welds in the air chamber is achieved.

[0056] The horizontal upper cover 231 is provided with an air hole communicating with the air chamber. The hollow spring guide post 20 is inserted into the air hole, vertically extending into the air chamber. A connecting hole 203 is provided at the bottom of the hollow spring guide post 20, which is smaller than the air hole. This arrangement creates a step on the hollow spring guide post 20, facilitating sealing of the air hole. This prevents machining chips from entering the air chamber when installing a process plug during the overall fabrication of the frame.

[0057] The lower curved beam upper cover plate 23 is an integrally formed bent plate 1182. In this embodiment, the existing structure replaces the irregularly shaped forgings with bent parts, reducing manufacturing difficulty and procurement costs. In the existing structure, the horizontal section is thicker to facilitate grinding during processing and improve flatness. In this embodiment, a hollow spring seat plate 201 is provided surrounding the air hole. This 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 ribs 28 are welded to the left and right upright plates 21 and 22. In this embodiment, there are multiple reinforcing ribs 28. In addition to being welded to the left and right upright plates 21 and 22, one side of the reinforcing ribs 28 can also be connected to the lower curved beam upper cover plate 23, the second closing plate 27, the air chamber ribs 26, the stabilizing wheel mounting seat 202, etc. as needed.

[0059] The left vertical plate 21, right vertical plate 22, lower curved beam upper cover plate 23, lower curved beam lower cover plate 24, first closing plate 25, air chamber rib plate 26 and second closing plate 27 are all connected by welding. Except for the second closing plate 27 being welded obliquely to the inclined upper cover 232, the rest of the structures are welded vertically.

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

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

[0062] like Figures 7 to 10 As shown, the composite beam 1 for the bogie 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] The high side beams 11 and low side beams 12 are arranged at opposite ends, and the traction beams 13 and end beams 14 are arranged at opposite ends. This arrangement gives the bogie's combined beam 1 a "U"-shaped structure. Compared to existing "X"-shaped beam structures, this "U"-shaped box beam is more stable in terms of load bearing and can better withstand large impacts. The "U"-shaped combined beam 1 for the bogie serves as a base, and when assembled with the lower bending beam 2, the overall welding deformation is minimal.

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

[0065] like Figures 11 to 12 As shown, the high side beam 11 includes a motor mounting plate 111 provided with a motor mounting interface and extending in the vertical direction, a motor outer plate 112 spaced apart from the motor mounting plate 111 in the horizontal direction, a motor upper cover plate 113 surrounding the motor mounting interface and vertically connecting the motor mounting plate 111 and the motor outer 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 part of the motor mounting plate 111, a connecting forging 116, two motor connecting plates 117, a high side beam outer plate 118 welded to the motor upper cover plate 113, a plurality of reinforcing ribs 119 connecting the motor mounting plate 111, the motor outer plate 112 and the motor upper cover plate 113, and a clamp mounting seat 110 welded to the motor outer plate 112 on the side away from the motor mounting plate 111.

[0066] In the existing structure, a high-end beam and a motor beam are set, and the high-end beam serves as the bearing base of the motor beam; the connection weld between the motor mounting plate and the lower cover plate, the main load-bearing component, is very close, which easily generates additional welding stress; there are both lap welds and T-joint fillet welds at the corner position, and the corner position is small in size, with large welding heat input and welding deformation, and is prone to welding defects, which is a weak point at the key load-bearing position.

[0067] In this embodiment, the high side beam 11 is used to integrate the original motor beam and the high end beam to form a closed box beam with better overall bearing strength; the motor mounting plate 111 is connected to the motor outer plate 112 and the high side beam middle cover plate 115 through two motor connecting plates 117, which has a compact structure, optimizes the connection method of the welds, eliminates the weak points of the stress-bearing position, and ensures reliable structural strength; the distance between the connecting welds of the main stress-bearing component, the motor mounting plate 111, and the high side beam lower cover plate 114, is increased to reduce the generation of additional stress from additional welding.

[0068] The connecting forging 116 includes a first connecting surface 1161 and a second connecting surface 1162, which 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 high side beam middle cover plate 115. In this embodiment, the connecting forging 116 is welded to the motor mounting plate 111 and the high side beam middle cover plate 115, thereby improving welding strength, simplifying installation, and avoiding stress concentration.

[0069] The motor mounting plate 111 is an integrated forging. The motor mounting plate 111 is provided with a mounting protrusion surrounding the motor mounting interface and protruding toward the low side beam 12. The mounting protrusion is penetrated by a motor mounting hole for mounting the motor.

[0070] The two motor connection plates 117 are connected to either side of the motor mounting plate 111. The upper and lower ends of the motor connection plates 117 are connected to the high side beam middle cover plate 115 and the high side beam lower cover plate 114, respectively. In this embodiment, the motor mounting plate 111 is a forged component, which is relatively expensive. Separating the two side motor connection plates 117 from 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 an 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 seat 110 is directly welded to the motor outer plate 112, and the lower end of the clamp mounting seat 110 is welded to the motor upper cover plate 113. Compared with the existing structure, the reinforcing plate is omitted, the structure is compact, and the connection strength is reliable.

[0073] The high side beam outer plate 118 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 connection plate 117. The high side beam outer plate 118 is a symmetrical open bent plate with grooves on both ends for welding.

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

[0075] The motor mounting plate 111, motor connecting plate 117, connecting forging 116, high side beam lower cover plate 114, high side beam outer 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 a plurality of reinforcing plates are provided in the inner cavity.

[0076] The reinforcing rib 119 is arranged between the motor mounting plate 111 and the motor outer plate 112 and is provided with a drainage hole.

[0077] The motor upper cover plate 113, the high side beam middle cover plate 115, the motor upper cover plate 113, the motor outer plate 112, and the reinforcing ribs 119 form an open "cylindrical" structure with a simple installation method and reliable structural strength.

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

[0079] The motor outer plate 112 and the end of the lower curved beam upper cover plate 23 are V-shaped butt welded in the vertical direction. The covering plate 29, the left vertical plate 21 and the right vertical plate 22 are all perpendicular to the high side beam lower cover plate 114 and are all T-jointed with the high side beam lower cover plate 114.

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

[0081] The low side beam outer plate 121 is a symmetrical open bent plate, including a flat portion 1211 and a bent portion 1212 , with a groove provided at the end, and the bent portion 1212 is directly welded to the outer inner plate.

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

[0083] The low side beam upper cover plate 123, the low side beam lower cover plate 124, the low side beam outer vertical plate 121, and the low side beam inner vertical plate 122 form a closed inner cavity, and a plurality of reinforcing plates are provided in the inner cavity.

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

[0085] The ends of the lower side beam outer plate 121 and the lower curved beam upper cover plate 23 are vertically butt-welded by V-type welding. The covering plate 29, the left vertical plate 21 and the right vertical plate 22 are all perpendicular to the lower side beam cover plate 124 and are all T-jointed with the lower side beam cover plate 124.

[0086] like Figure 7As shown, multiple guide wheel mounting seats 15 are welded and fixed on the high side beam 11 or the low side beam 12, and the 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 outside of the high side beam 11 or the low side beam 12, and the inner side of the high side beam 11 or the low side beam 12 is provided with an internal rib adjacent to the guide wheel mounting seat 15.

[0087] In this embodiment, there are four guide wheel mounting seats 15, two of which are welded to the high side beam 11 and two to the low side beam 12. Furthermore, when the guide wheel mounting seats 15 are welded to the high side beam 11, they are welded to the bent plate 1182. When the guide wheel mounting seats 15 are welded to the low side beam 12, they are 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 seat 15 is structurally optimized by providing two welding plates 152 to form a double arc weld, which reduces weight while enhancing the reliability of the connection structure; internal ribs are provided in the inner cavity of the box beam in contact with it, which simplifies the structure, ensures the compactness of the structure, and improves the bearing strength of the overall structure.

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

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

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

[0092] In this embodiment, by providing a connecting base 1351 connected to the traction portion 1352 in a horizontal direction, the connecting base 1351 can be welded to the traction beam outer plate 131 and the traction beam inner plate 132, thereby reducing the generation of additional stress, and preventing weld flanges and welding defects. The overall strength is reliable, the structure is compact, and weld flanges are prevented. The connecting base is in an inverted U-shape to reduce weight without affecting welding strength.

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

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

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

[0096] Both ends of the traction beam inner plate 132 are respectively welded to the motor connection plate 117 and the low side beam inner plate 122 .

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

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

[0099] Both 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 along the horizontal direction.

[0100] Both ends of the end beam outer plate 141 are welded to the bent plate 1182 of the high side beam outer plate 118 and the bent portion 1212 of the low side beam outer plate 121 along the horizontal direction respectively.

[0101] Both ends of the end beam inner upright plate 142 are respectively welded to the motor connecting plate 117 and the low side beam inner upright plate 122 .

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

[0103] The straddle-type bogie frame 100 and the straddle-type monorail vehicle of the present invention are formed by separating the composite beam 1 and the lower curved beam 2 for the bogie and then welding them together to form the straddle-type bogie frame 100. The air chamber is independently formed in the lower curved beam 2, decoupling the low side beam 12 and the high side beam 11, so that the structure has better stress resistance and better weld accessibility. The composite beam 1 for the bogie is used as a base. When it is assembled with the lower curved beam 2, the overall welding deformation is small, it is not easy to twist, and the size after welding is easy to control. The composite beam 1 for the bogie of the present invention is composed 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, and the welding deformation is small. The motor beam is integrated into the high side beam 11 to form a closed box beam. The overall bearing strength is better, and the distance between the welding seam connecting the main load-bearing component, the motor mounting plate 111, and the high side beam lower cover plate 114 is increased, reducing the generation of additional stress caused by additional welding. The lower curved beam 2 of the present invention is provided with a second sealing plate 27 and an air chamber rib 26 to replace the original partition, thereby reducing the manufacturing difficulty while ensuring the structural strength and achieving 100% detection of all welds in the air chamber.

[0104] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned 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 above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A composite beam for a bogie, characterized in that: The combined beam for the bogie 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. The high side beam includes a motor mounting plate provided with a motor mounting interface and extending in a vertical direction, a motor outer plate spaced apart from the motor mounting plate in a horizontal direction, a motor upper cover plate surrounding the motor mounting interface and vertically connecting the motor mounting plate and the motor outer plate, a high side beam lower cover plate connected to the bottom of the motor mounting plate, a high side beam middle cover plate connected to the middle of the motor mounting plate, and a connecting forging. The connecting forging includes a first connecting surface and a second connecting surface perpendicular to each other, the first connecting surface is welded to the side of the motor mounting plate, and the second connecting surface is welded to the high side beam middle cover plate.

2. The composite beam for a bogie according to claim 1, characterized in that: The high side beam also includes two motor connecting plates, which are respectively connected to the two sides of the motor mounting plate, and the upper end and lower end of the motor connecting plate are respectively connected to the high side beam middle cover plate and the high side beam lower cover plate.

3. The composite beam for a bogie according to claim 2, characterized in that: The high side beam further comprises a high side beam outer plate welded to the motor upper cover plate, the high side beam outer plate comprising a flat plate spaced horizontally from the motor mounting plate and a bent plate connecting the flat plate and the motor connecting plate.

4. The composite beam for a bogie according to claim 1, characterized in that: The high side beam further includes a plurality of reinforcing ribs connecting the motor mounting plate, the motor outer plate and the motor upper cover plate.

5. The composite beam for a bogie according to claim 1, characterized in that: The high side beam further includes a clamp mounting seat welded to a side of the motor outer plate away from the motor mounting plate.

6. The composite beam for a bogie according to claim 1, characterized in that: The combined beam for the bogie also includes a plurality of guide wheel mounting seats, which are welded and fixed on the high side beam or the low side beam. The guide wheel mounting seat includes a seat body and at least two welding plates connected to the seat body. The seat body and the welding plates are welded to the outside of the high side beam or the low side beam, and the inside of the high side beam or the low side beam is provided with an internal rib adjacent to the guide wheel mounting seat.

7. The composite beam for a bogie according to claim 1, characterized in that: The high side beam is connected to the traction beam and the end beam by V-shaped butt welding and T-joint fillet welding, and the low side beam is connected to the traction beam and the end beam by V-shaped butt welding and T-joint fillet welding.

8. The composite beam for a bogie according to claim 1, characterized in that: The traction beam includes a traction beam outer plate located on the side away from the end beam, a traction beam inner plate located on the side close to the end beam, a traction beam lower cover connected to the bottom of the traction beam inner plate, and a traction seat. The traction seat includes a connecting seat body and a traction part arranged on the side of the connecting seat body away from the end beam. The traction beam outer plate is provided with a first clearance groove for the connecting seat body to pass through, and the traction beam inner plate is provided with a second clearance groove for the connecting seat body to pass through.

9. The composite beam for a bogie according to claim 8, characterized in that: The bottom of the traction beam outer plate is lower than the traction beam lower cover plate, and a connecting surface is provided on the side where the connecting seat is connected to the traction part. The connecting surface is coplanar with the traction beam outer plate in the vertical direction, and the bottom end is flush with the bottom end of the traction beam outer plate. The side of the traction connection part facing the end beam is coplanar with the traction beam inner plate.

10. A straddle-type bogie frame, characterized in that: The straddle-type bogie frame comprises a composite beam and a lower bending beam for a bogie as described in any one of claims 1 to 9.

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