Low-floor bogie and railway vehicle

Abstract

The invention discloses a low-floor bogie and a railway vehicle, the low-floor bogie comprises a framework, the two ends of the framework in the length direction are each provided with an independent axle assembly, and the two independent axle assemblies are driven through a driving unit; the independent axle assembly comprises two independent rotating ground wheels and an axle connected with the two wheels, the axle is in a downward concave shape, and the symmetric center of the axle is located below the axial center line of the two wheels. The driving unit comprises a driving assembly, a driven assembly and a connecting rod connecting the driving assembly and the driven assembly. The output end of the driving assembly and the output end of the driven assembly are in transmission connection with the two wheels correspondingly. The two ends of the connecting rod are in coupling connection with the driving assembly and the driven assembly respectively, and the driving assembly transmits torque to the driven assembly through the connecting rod. According to the low-floor bogie, the technical problem of how to reduce the middle height of the bogie to achieve 100% low floor in the prior art is solved.

Description

Technical Field

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

[0002] At present, low-floor urban buses are becoming popular. As an important part of urban transportation, low-floor vehicles have the advantages of low construction cost, short cycle, large passenger capacity, strong small curve passing ability, small civil engineering demolition scope, low operating noise, and environmental friendliness compared with subways. At the same time, they are equipped with cutting-edge technologies such as bowless current collection and supercapacitors. They have shown a rapid development trend in recent years. Among them, the low-floor bogie that keeps the height of the car floor consistent with the platform height is called a 100% low-floor bogie. The space of a 100% low-floor bogie is very compact, and the design of the wheelset drive system is the core of the integrated design of the bogie system. The wheelset drive system consists of a traction motor, a transmission gearbox, and an axle assembly. When the traction motor is designed to be arranged horizontally (in the direction of the track width), the drive unit composed of the transmission gearbox is hung inside the bogie and used in conjunction with the traditional axle assembly. The floor height is limited by the axle height determined by the diameter of the traditional wheel and the upper limit requirements of the drive unit. It is impossible to reduce the middle height of the bogie to achieve 100% low floor. Summary of the invention

[0003] In view of the current technical problems, the present invention aims to provide a low-floor bogie and a rail vehicle. The low-floor bogie can solve the technical problem in the prior art of how to reduce the middle height of the bogie to achieve a 100% low floor.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A low-floor bogie comprises a frame, and its structural features are as follows: independent wheel axle assemblies are provided at both ends of the frame along the length direction, and the two independent wheel axle assemblies are driven by drive units respectively; the independent wheel axle assemblies comprise two independently rotatable wheels and axles connecting the two wheels, the axles are concave in shape, and the symmetry center of the axles is located below the axial center lines of the two wheels; the drive unit comprises a drive assembly, a driven assembly, and a connecting rod connecting the drive assembly and the driven assembly, and the output ends of the drive assembly and the driven assembly are respectively connected to the two wheels in a transmission manner; the two ends of the connecting rod are respectively coupled to the drive assembly and the driven assembly, and the drive assembly transmits torque to the driven assembly through the connecting rod.

[0006] The low-floor bogie of the present application is provided with a connecting rod. When the driving assembly drives the wheel on one side, it also provides a torsional force to the connecting rod. The connecting rod transmits the torque to the driven assembly and drives the wheel on the other side through the driven assembly, so that one driving unit can drive two independent wheels on the left and right at the same time. The two independently rotating wheels are connected by an axle, which no longer needs to rotate, and the axle between the traditional wheelsets is eliminated, so that the height of the middle part of the bogie can be effectively reduced, which is conducive to a 100% low-floor design. The axle used is concave, providing bearing capacity and guiding force for the two independent wheels. Since the two wheels rotate independently, there is no longitudinal creep force between the wheel rail, avoiding the serpentine instability phenomenon of the traditional wheelset. At the same time, by providing a connecting rod, the left and right independent wheels are laterally coupled, so that the independent wheels in the present application also have the linear reset ability and curve guiding ability of the traditional rigid wheelset, which is convenient for decoupling and the overall maintainability of the drive unit is high.

[0007] Preferably, the driving assembly includes a traction motor and a driving gearbox, the traction motor is suspended on the side beam of the frame; the output end of the traction motor is connected to the input end of the driving gearbox, the output end of the driving gearbox is connected to the wheel on one side, and the driving gearbox is coupled to the connecting rod through gears; the driven assembly includes a driven gearbox, the input end of the driven gearbox is coupled to the connecting rod, and the output end of the driven gearbox is connected to the wheel on the other side. The traction motor in the driving assembly is suspended and prevented from falling off at multiple points on the side beam, which not only reduces the failure rate, but also makes the motor single-point transmission easy to disassemble, reduces costs and increases efficiency, and does not affect the middle height of the bogie, promoting a 100% low-floor design.

[0008] Since existing low-floor bogies have insufficient lateral space, preferably, the traction motor is arranged along the length direction of the frame, and the two drive units are arranged symmetrically about the center of the frame.

[0009] Specifically, the driving gearbox and the driven gearbox are both arranged on the outsides of the two wheels, and the driving gearbox and the driven gearbox are both connected to the two ends of the axle.

[0010] Preferably, the driving gearbox and the driven gearbox are both provided with speed sensors, which are electrically connected to the control system. By measuring the speed of the gears and transmitting the signals to the control system, the left and right wheels are ensured to have the same angular velocity, so that the wheels in the same position of the bogie can rotate synchronously while rotating around the axle.

[0011] Preferably, the axle includes a connecting rod and bosses arranged at both ends of the connecting rod, the axial center line of the connecting rod along the length direction is located below the axial center line of the two wheels, and the outer ends of the two bosses are respectively connected to the two wheels through wheel bearings.

[0012] Preferably, the boss is provided with a first-series suspension device mounting hole for installing a first-series suspension system, a first-series lifting device mounting hole for installing a first-series lifting device, a magnetic rail brake device mounting hole for installing a magnetic rail brake device, a grounding assembly and an adjustment pad mounting hole, and the frame is connected to the axle through the first-series suspension system. The grounding assembly includes a grounding device and its seal, and the independent wheel axle assembly realizes the system integration of components such as the first-series suspension system, the first-series lifting device, the magnetic rail brake device, and the grounding device. The layout is compact and can effectively reduce the height of the middle part of the bogie. Compared with the traditional subway bogie, the axle used in the present application, in addition to no longer rotating, can replace the axle to provide bearing capacity and guiding force. If equipped with a differential mechanism, the curve-crossing ability can be further improved.

[0013] Preferably, a magnetic rail brake device is suspended below the frame, the magnetic rail brake device is connected to the magnetic rail brake device mounting hole, and a disc brake device is provided on the drive assembly. Braking is achieved through the magnetic rail brake device and the disc brake device.

[0014] Based on the same inventive concept, the present application also provides a rail vehicle, including a car body, a low-floor bogie as described above is provided at the bottom of the car body, the car body and the frame are connected by a two-stage suspension system, and a through-type low floor is provided in the car body. As the height of the middle part of the bogie decreases, the height of the traction rod arranged on the frame crossbeam tube decreases accordingly, the traction point is lower than the center of the wheel axle, the axle weight transfer is small, the adhesion mass utilization rate is high, and the aisles in the car are all designed as through-type low floors, without the need to set up platforms or transition steps, which greatly facilitates passenger transfers, reduces stop time, and improves transportation efficiency. The rail vehicle of the present application adopts a transverse coupling drive method, which can adapt to the formation form with floating cars, thereby achieving a larger passenger capacity.

[0015] Preferably, two double seats are arranged above the secondary spring and the secondary vertical shock absorber in each secondary suspension system in the vehicle body, and the two double seats are arranged back to back along the length direction of the vehicle body, and the secondary lateral shock absorber in the secondary suspension system is arranged in the middle of the end beam of the frame. In order to adapt to the longitudinal height difference caused by the secondary spring and the secondary vertical shock absorber, the secondary spring and the secondary vertical shock absorber are arranged under the seats on both sides of the vehicle, and the secondary lateral shock absorber is arranged in the middle of the end beam, with a large damping stroke, while not affecting the aisle in the vehicle. The 100% design is a through-type low floor, providing a smooth and comfortable passenger experience for train operation with a large passenger capacity and high operating speed.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The low-floor bogie of the present invention has no longitudinal creep force between the independent wheelset and the wheel-rail, thus avoiding the serpentine instability phenomenon of the traditional wheelset. Through the lateral coupling of the left and right independent wheels, it also has the linear reset capability and curve guiding capability of the traditional rigid wheelset.

[0018] 2. The low-floor bogie of the present invention realizes the system integration of components such as disc brake device, magnetic rail brake device, primary suspension system, primary lifting device, and grounding device. Compared with the traditional subway bogie, the adopted axle no longer rotates and can replace the axle to provide bearing capacity and guiding force. If equipped with a differential mechanism, the curve-crossing ability can be further improved.

[0019] 3. The low-floor bogie of the present invention has a traction motor in a drive assembly that is suspended and prevented from falling off at multiple points on the side beams, which not only reduces the failure rate, but also makes the motor's single-point transmission easy to disassemble, reduces costs and increases efficiency, while also not affecting the middle height of the bogie, promoting a 100% low-floor design.

[0020] 4. The rail vehicle of the present invention adopts a transverse coupling drive mode and can adapt to the formation form with floating cars, thereby achieving a larger passenger capacity.

[0021] 5. The rail vehicle of the present invention eliminates the axles between the traditional wheel sets, reduces the floor surface to a minimum, and realizes that 100% of the aisles in the vehicle are designed as through-type low floors. There is no need to set up platforms or transition steps, which greatly facilitates passengers to transfer, reduces stop time, and improves transportation efficiency.

[0022] 6. The rail vehicle of the present invention arranges the secondary springs and the secondary vertical shock absorbers under the seats on both sides of the vehicle, and the secondary lateral shock absorbers are arranged in the middle of the end beam. The damping stroke is large and the aisle inside the vehicle is 100% designed as a through-type low floor without affecting the operation, providing a smooth and comfortable passenger experience for train operation with a large passenger capacity and high operating speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of a low-floor bogie of the present invention;

[0024] Figure 2 yes Figure 1 The schematic diagram of the structure of the independent wheel assembly is shown in FIG.

[0025] Figure 3 yes Figure 1 Schematic diagram of the connection structure between the independent wheel assembly and the drive unit;

[0026] Figure 4 It is a schematic diagram of the structure of a rail vehicle of the present invention;

[0027] Figure 5 yes Figure 4 Schematic diagram of the through-type low-floor structure in the middle vehicle body;

[0028] Figure 6 yes Figure 4 Schematic diagram of the seat arrangement above the secondary suspension system along the length of the vehicle;

[0029] Figure 7 yes Figure 4 Schematic diagram of the seat layout above the secondary suspension system along the width of the vehicle.

[0030] In the figure

[0031] 1-independent wheel axle assembly; 101-wheel; 102-axle; 102-1-connecting rod; 102-2-boss; 103-wheel bearing; 104-primary suspension device mounting hole; 105-primary lifting mounting hole; 106-magnetic rail brake device mounting hole; 107-grounding assembly; 108-adjustment pad mounting hole; 2-drive unit; 201-drive assembly; 201-1-traction motor; 201-2-driving gearbox; 202-driven assembly; 202-1-driven gearbox; 203-connecting rod; 3-frame; 4-primary suspension system; 5-primary lifting device; 6-magnetic rail brake device; 7-disc brake device; 8-secondary suspension system; 801-secondary spring; 802-secondary vertical shock absorber; 803-secondary lateral shock absorber; 9-body; 901-through low floor; 10-double seat. DETAILED DESCRIPTION

[0032] The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict. For the convenience of description, if the words "upper", "lower", "left" and "right" appear in the following, they only indicate that the upper, lower, left and right directions are consistent with the drawings themselves, and do not limit the structure.

[0033] like Figure 1 As shown, a low-floor bogie of this embodiment includes a frame 3, and both ends of the frame 3 along the length direction are provided with independent wheel axle assemblies 1, and the two independent wheel axle assemblies 1 are driven by drive units 2 respectively. Figure 2 As shown, the independent wheel axle assembly 1 includes two independently rotatable wheels 101 and a bridge 102 connecting the two wheels 101, and both wheels 101 are elastic wheels. The bridge 102 is concave, and includes a connecting rod 102-1 and bosses 102-2 arranged at both ends of the connecting rod 102-1. The axial center line of the connecting rod 102-1 along the length direction is located below the axial center line of the two wheels 101, and the outer ends of the two bosses 102-2 are respectively connected to the two wheels 101 through wheel bearings 103. The boss 102-2 is provided with a primary suspension device mounting hole 104 for mounting a primary suspension system 4, a primary lifting device mounting hole 105 for mounting a primary lifting device 5, a magnetic rail brake device mounting hole 106 for mounting a magnetic rail brake device 6, a grounding component 107 and an adjustment pad mounting hole 108. The frame 3 and the bridge 102 are connected through the primary suspension system 4. As shown Figure 1As shown, a magnetic rail brake device 6 is suspended below the frame 3, and the magnetic rail brake device 6 is connected to the magnetic rail brake device mounting hole 106, and a disc brake device 7 is provided on the drive unit 2. Figure 3 As shown, the driving unit 2 includes a driving assembly 201, a driven assembly 202, and a connecting rod 203 connecting the driving assembly 201 and the driven assembly 202. The output ends of the driving assembly 201 and the driven assembly 202 are respectively connected to the two wheels 101. The two ends of the connecting rod 203 are respectively coupled to the driving assembly 201 and the driven assembly 202. The driving assembly 201 transmits the torque to the driven assembly 202 through the connecting rod 203. Figure 1 and Figure 3 As shown, the driving assembly 201 includes a traction motor 201-1 and a driving gearbox 201-2, and the traction motor 201 is suspended on the side beam of the frame 3. The motor shaft of the traction motor 201-1 is coupled with the input shaft of the driving gearbox 201-2, and a gear is added in the driving gearbox 201-2 to interfere with the connecting rod 203. The input gear interfered with on the shaft drives the output gear and provides a torsional force for the connecting rod 203. The output end of the driving gearbox 201-2 is connected to the wheel 101 on one side. The driven assembly 202 includes a driven gearbox 202-1, the input end of the driven gearbox 202-1 is coupled and connected to the connecting rod 203, the output end of the driven gearbox 202-1 is connected to the wheel 101 on the other side, and the connecting rod 203 is bolted to the input shaft of the driven gearbox 202-1, so as to realize the requirement that one traction motor 201-1 drives two independent wheels 101 on the left and right. The traction motor 201-1 is arranged along the length direction of the frame 3, and the two drive units 2 are arranged obliquely symmetrically about the center of the frame 3. The driving gearbox 201-2 and the driven gearbox 202-1 are both arranged on the outside of the two wheels 101, and the driving gearbox 201-2 and the driven gearbox 202-1 are both connected to the two ends of the axle 102. Speed ​​sensors are provided in the driving gearbox 201-2 and the driven gearbox 202-1, and the speed sensors are electrically connected to the control system.

[0034] like Figure 4 and Figure 5 As shown, this embodiment also provides a rail vehicle including a car body 9, a low-floor bogie as described above is provided at the bottom of the car body 9, the car body 9 is connected to the frame 3 via a secondary suspension system 8, and a through-type low floor 901 is provided in the car body 9. Figure 1 , Figure 6 and Figure 7 As shown, two double seats 10 are provided above the secondary spring 801 and the secondary vertical shock absorber 802 in each secondary suspension system 8 in the vehicle body 9. The two double seats 10 are arranged back to back along the length direction of the vehicle body 9. The secondary lateral shock absorber 803 in the secondary suspension system 8 is arranged in the middle of the end beam of the frame 3.

[0035] like Figure 1 As shown, the frame 3 is placed on two independent wheel axle assemblies 1 through a four-point distributed primary suspension system 4, and is equipped with a primary lifting device 5. The middle active gearbox 201-2 of the two obliquely symmetrically distributed transverse coupling drive units 2 is assembled at both ends of the independent wheel axle assemblies 1. The traction motor 201-1 is suspended on the frame 3. The two realize transmission through a coupling. The braking is realized by a magnetic rail brake device 6 suspended under the frame 3 and a disc brake device 7 connected to the end of the active gearbox 201-2. A secondary suspension system 8 is arranged in connection with the car body 9. The overall structure is compact, the layout is ingenious, and the weight is light. The output shaft of the traction motor 201-1 is coaxial with the input shaft of the active gearbox 201-2, and the torque is transmitted to the wheel 101 on this side, and at the same time acts on the connecting rod 203. The driven end of the connecting rod 203 is coaxial with the input shaft of the driven gearbox 202-1, and the torque is transmitted to the wheel 101 on the other side, so that the left and right independent wheels 101 are transversely coupled. By setting a speed sensor, it is ensured that the left and right wheels 101 have the same angular velocity, so that the wheels in the same position of the bogie rotate around the axle 102 respectively and rotate synchronously at the same time. The independent wheel axle assembly 1 in this embodiment eliminates the axle between the traditional wheel sets, and adopts the axle 102 that is concave and provides bearing capacity and guiding force, so that the floor surface is reduced to the minimum, which is conducive to 100% low-floor design. Since the two wheels 101 rotate independently, there is no longitudinal creep force between the wheel rail, avoiding the serpentine instability phenomenon of the traditional wheel set. At the same time, through the lateral coupling of the left and right independent wheels 101, it has the linear reset ability and curve guiding ability of the traditional rigid wheel set, and it is also easy to decouple, and the overall maintainability of the drive unit 2 is high. As the height of the middle part of the bogie decreases, the height of the traction rod arranged on the crossbeam tube of the frame 3 is reduced accordingly, the traction point is lower than the center of the wheel axle, the axle weight transfer is small, the adhesion mass utilization rate is high, and the aisle in the rail vehicle is fully designed as a through-type low floor 901, without the need to set up a platform or transition steps, which greatly facilitates passenger transfers, reduces parking time, and improves transportation efficiency. In order to adapt to the longitudinal height difference caused by the secondary spring 801 and the secondary vertical shock absorber 802, based on the requirement of improving the transportation volume, a double seat 10 is arranged above them, so that eight double seats 10 can be arranged above the bogie, and cooperate with the secondary lateral shock absorber 803 to bring a comfortable and smooth riding experience.

[0036] The contents explained in the above embodiments should be understood as these embodiments are only used to more clearly illustrate the invention, and are not used to limit the scope of the invention. After reading the present invention, various equivalent forms of modifications to the embodiments by those skilled in the art fall within the scope defined by the claims attached to the present invention.

Claims

1. A low-floor bogie, comprising a frame (3), characterized in that: The frame (3) is provided with independent wheel axle assemblies (1) at both ends along the length direction, and the two independent wheel axle assemblies (1) are driven by drive units (2) respectively; The independent wheel axle assembly (1) comprises two independently rotatable wheels (101) and a wheel bridge (102) connecting the two wheels (101); the wheel bridge (102) is concave in shape, and the symmetry center of the wheel bridge (102) is located below the axial centerline of the two wheels (101); The driving unit (2) comprises a driving assembly (201), a driven assembly (202), and a connecting rod (203) connecting the driving assembly (201) and the driven assembly (202); the output ends of the driving assembly (201) and the driven assembly (202) are respectively connected to the two wheels (101); The two ends of the connecting rod (203) are respectively coupled to the driving component (201) and the driven component (202), and the driving component (201) transmits torque to the driven component (202) through the connecting rod (203).

2. The low-floor bogie according to claim 1, characterized in that: The driving assembly (201) comprises a traction motor (201-1) and a driving gear box (201-2), the traction motor (201) being suspended on a side beam of a frame (3); the output end of the traction motor (201-1) being connected to the input end of the driving gear box (201-2), the output end of the driving gear box (201-2) being transmission-connected to a wheel (101) on one side, and the driving gear box (201-2) being coupled to a connecting rod (203) via gears; the driven assembly (202) comprises a driven gear box (202-1), the input end of the driven gear box (202-1) being coupled to a connecting rod (203), and the output end of the driven gear box (202-1) being transmission-connected to a wheel (101) on the other side.

3. The low-floor bogie according to claim 2, characterized in that: The traction motor (201-1) is arranged along the length direction of the frame (3), and the two drive units (2) are arranged symmetrically about the center of the frame (3).

4. The low-floor bogie according to claim 2, characterized in that: The driving gearbox (201-2) and the driven gearbox (202-1) are both arranged outside the two wheels (101), and the driving gearbox (201-2) and the driven gearbox (202-1) are both connected to the two ends of the axle (102).

5. The low-floor bogie according to claim 2, characterized in that: The driving gearbox (201-2) and the driven gearbox (202-1) are both provided with speed sensors, and the speed sensors are electrically connected to the control system.

6. The low-floor bogie according to claim 1, characterized in that: The axle (102) comprises a connecting rod (102-1) and bosses (102-2) arranged at both ends of the connecting rod (102-1); the axial center line of the connecting rod (102-1) along the length direction is located below the axial center line of the two wheels (101); and the outer ends of the two bosses (102-2) are respectively connected to the two wheels (101) through wheel bearings (103).

7. The low-floor bogie according to claim 6, characterized in that: The boss (102-2) is provided with a first-order suspension device mounting hole (104) for mounting a first-order suspension system (4), a first-order lifting mounting hole (105) for mounting a first-order lifting device (5), a magnetic rail brake device mounting hole (106) for mounting a magnetic rail brake device (6), a grounding component (107) and an adjustment pad mounting hole (108); the frame (3) and the axle (102) are connected via the first-order suspension system (4).

8. The low-floor bogie according to claim 7, characterized in that: A magnetic rail brake device (6) is suspended below the frame (3), and the magnetic rail brake device (6) is connected to a magnetic rail brake device mounting hole (106). A disc brake device (7) is provided on the drive assembly (201).

9. A rail vehicle, comprising a vehicle body (9), characterized in that: A low-floor bogie as claimed in any one of claims 1 to 8 is provided at the bottom of the car body (9), the car body (9) and the frame (3) are connected via a secondary suspension system (8), and a through-type low floor (901) is provided in the car body (9).

10. The rail vehicle according to claim 9, characterized in that: Two double seats (10) are arranged above the secondary spring (801) and the secondary vertical shock absorber (802) in each secondary suspension system (8) in the vehicle body (9), and the two double seats (10) are arranged in back-to-back directions along the length direction of the vehicle body (9), and the secondary lateral shock absorber (803) in the secondary suspension system (8) is arranged in the middle of the end beam of the frame (3).

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