Low-floor tram bogie suitable for wheelchairs

Abstract

A wheelchair-accessible low-floor tram bogie relates to the technical field of low-floor tram bogies and includes a frame, primary longitudinal tie rods, a primary suspension spring assembly, a brake caliper, a brake disc, a coupling, a motor, a secondary suspension spring assembly, a secondary vertical damper, a traction tie rod, a transverse stop, a magnetic rail brake, wheels, an axle bridge, an axlebox, a gearbox, and a wheel core assembly. The bogie of the present invention meets the requirements for convenience and safety for disabled people passing through the vehicle, as well as passenger comfort, while meeting the standard vehicle width and standard track gauge, without compromising low-floor tram bogie performance and maintaining an unchanged vehicle floor surface.

Description

Technical Field

[0001] The invention relates to the technical field of low-floor tram bogies, and in particular to a low-floor tram bogie capable of allowing wheelchairs to pass through. Background Art

[0002] Currently, internationally, and especially in North America, there are increasingly high demands for the convenience and safety of low-floor trams for people with disabilities. Wheelchairs must be able to pass through the entire tram, which requires the minimum aisle width to be no less than 813mm, the width of a wheelchair. However, existing low-floor tram bogies use axle-box-integrated bogies. Since the primary suspension spring group and frame side beams are located inside the wheels, they occupy the space on the wheelbacks on both sides, limiting the width of the aisle. As a result, the minimum aisle width in trams internationally is generally around 650mm. Even if the aisle width of individual longitudinally arranged seats is just wide enough for wheelchairs to pass through, the legs of the seated passengers occupy the aisle space. When a wheelchair passes through, the seated passengers need to stand up and leave the wheelchair to pass through the aisle directly above the bogie, which brings inconvenience to the seated passengers.

[0003] Based on the above situation, if the axle box is directly placed on the outside of the wheel, the external longitudinal drive device connected to the wheelset axle box device will exceed the width of the low-floor tram, which does not meet the vehicle design requirements. Summary of the Invention

[0004] The object of the present invention is to provide a low-floor tram bogie that can accommodate wheelchairs. The bogie is an independent-wheel bogie in which the axle box is external to the wheel, the axle box is integrated with the gear box and the wheel core, and the drive device is longitudinally coupled. The bogie can meet the requirements of convenience and safety for disabled people to pass through the vehicle and comfort for seat passengers while meeting the standard vehicle width and standard track gauge, without reducing the performance of the low-floor tram bogie and maintaining the vehicle floor surface unchanged.

[0005] The technical solutions adopted by the present invention to solve the technical problems are as follows:

[0006] A low-floor tram bogie capable of accommodating wheelchairs comprises: a frame, a primary longitudinal tie rod, a primary suspension spring assembly, a brake caliper, a brake disc, a coupling, a motor, a secondary suspension spring assembly, a secondary vertical shock absorber, a traction tie rod, a transverse stop, a magnetic rail brake, and wheels. The bogie is characterized in that it also comprises an axle bridge, an axle box, a gear box, and a wheel core assembly.

[0007] The crossbeam of the frame is provided with a frame step at each end thereof for avoiding the step of the vehicle body underframe. Two axle bridges are parallel to the crossbeam and arranged on the outside of the crossbeam. An axle seat is provided at each end of each axle bridge.

[0008] Each axle box, gear box and wheel core assembly is a compact integrated structure consisting of an axle box, a gear box and a wheel core arranged transversely along the frame. The wheel core is rotatably connected to the axle seat through the first bearing and the second bearing. The axle box and the gear box are located outside the wheel and are rotatably connected to the wheel core through the third bearing and the fourth bearing.

[0009] The lower ends of the four steel springs of the primary suspension spring group are fixedly connected to the top of the four axle boxes and the gear box respectively, and the four steel springs of the primary suspension spring group are located in the four cap tubes of the two side beams of the frame respectively;

[0010] The motor is parallel to the side beam and hung on the outside of the side beam. The two ends of the motor are respectively connected to the input shaft of the gearbox through a coupling and an axle box; the brake caliper is fixed to the axle box and the outer shell of the gearbox, and the brake disc is fixed to the outer end of the wheel core;

[0011] The four primary longitudinal tie rods are symmetrically arranged, with one end of each of the four primary longitudinal tie rods fixedly connected to the axle bridge near the axle seat through a rubber node, and the other end of each of the four primary longitudinal tie rods fixedly connected to the crossbeam near the frame step through a rubber node.

[0012] The lower ends of the four steel springs of the secondary suspension spring group are symmetrically fixed in pairs at the middle position of the two side beams, and the upper ends of the four steel springs are all fixed to the vehicle body frame; the lower ends of the two secondary vertical shock absorbers are symmetrically fixed in the middle position of the two side beams and located between the two steel springs, and the upper ends of the two secondary vertical shock absorbers are all fixed to the vehicle body frame; one end of the traction rod is fixed to the crossbeam, and the other end is fixed to the vehicle body frame; the transverse stop is symmetrically fixed to the inner side walls of the two longitudinal beams of the frame, and the two magnetic rail brakes are suspended from the bottom of the frame through the hanger fixed to the bottom of the axle seat. The two magnetic rail brakes are symmetrically arranged between the two wheels on the same side parallel to the two longitudinal beams.

[0013] The beneficial effects of the present invention are as follows:

[0014] 1. The axlebox is positioned outside the wheels to increase the space inside the wheelbacks, making the aisle at the bogie position wide enough to accommodate wheelchairs, even with longitudinal steps on each side of the aisle. Passengers in the seating area place their feet on the longitudinal steps, eliminating the need for seated passengers to move through the aisle, thus reducing inconvenience for seated passengers.

[0015] 2. The axle box, gear box and wheel core are integrated into one, making it possible to place the axle box, gear box, motor and other drive devices between the skirt and wheels of a standard low-floor vehicle width.

[0016] 3. The axle box and gear box are placed on the outside of the wheel. Above the axle box and gear box is the seat area. There is sufficient vertical space, so the first-series suspension steel springs with greater vertical displacement, smaller stiffness and longer service life can be placed on the axle box and gear box. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The diagram is a structural diagram of a low-floor tram bogie that can accommodate wheelchairs according to the present invention.

[0018] Figure 2 The diagram is a partial exploded structural diagram of a low-floor tram bogie capable of passing a wheelchair according to the present invention.

[0019] Figure 3 yes Figure 2 Schematic diagram of the local explosion structure in the middle and lower parts.

[0020] Figure 4 It is a schematic diagram of the assembly relationship of the motor, coupling, axle box and gear box, wheel core assembly, brake caliper and brake disc in the present invention.

[0021] Figure 5 It is a schematic diagram of the assembly relationship of the axle bridge, wheel core and wheel in the present invention.

[0022] Figure 6 This is a schematic diagram of the application of the low-floor tram bogie that can accommodate wheelchairs of the present invention.

[0023] Figure 7 This is a schematic diagram of the application structure of the low-floor tram bogie capable of passing a wheelchair from another perspective of the present invention. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0025] like Figures 1 to 7 As shown, the low-floor tram bogie that can accommodate wheelchairs of the present invention includes: a frame 1, two axle bridges 2, four axle boxes, gear boxes and wheel core assemblies 3, four primary longitudinal tie rods 4, a primary suspension spring group 5, four brake calipers 6, four brake discs 7, four couplings 8, two motors 9, a secondary suspension spring group 10, two secondary vertical shock absorbers 11, a traction rod 12, four lateral stops 13, two magnetic rail brakes 14 and four wheels 15.

[0026] The crossbeam 1-1 of the frame 1 is equipped with a frame step 1-1-1 at each end along its lateral direction, designed to avoid steps 16A on the vehicle underframe 16. Two axle bridges 2 are parallel to and located outside the crossbeam 1-1, each with an axle seat 2A at each end. The two side beams 1-2 of the frame 1 have been moved from their traditional location inside the wheel 15 to outside it, increasing the lateral space available for the vehicle underframe 16 in the aisle. Furthermore, a step 16A is provided on the vehicle underframe 16 along the direction of the frame step 1-1-1. Passenger seats 17 are arranged along the length of the vehicle body, allowing passengers to place their feet on this step 16A. The lateral space between the steps 16A on either side of the aisle allows wheelchairs to pass freely.

[0027] Each axlebox, gearbox, and wheel core assembly 3 consists of an axlebox and gearbox 3B and a wheel core 3A, forming a compact integrated structure arranged transversely along the bogie frame. The wheel core 3A is rotatably connected to the axle seat 2A via a first bearing 19 and a second bearing 20. The axlebox and gearbox 3B is located outboard of the wheel 15 and rotatably connected to the wheel core 3A via a third bearing 21 and a fourth bearing 22. The axlebox, gearbox, and wheel core assembly 3 allows the functionalities of a conventional bogie axlebox and drive unit to be accommodated within the limited transverse space between the wheel 15 and the carbody skirt 18.

[0028] The lower ends of the four steel springs in the primary suspension spring assembly 5 are fixedly connected to the tops of the four axle boxes and gear box 3B. These springs are then positioned within the four caps 1-2-1 of the two side beams 1-2 of the frame 1. The structure of the axle box, gear box, and wheel core assembly 3 increases the vertical space between the axle box, gear box 3B, and the vehicle underframe 16. This allows the use of steel springs above the axle box and gear box 3B, which offer greater vertical displacement, reduced stiffness, and a longer service life, as the primary suspension spring assembly 5.

[0029] Motor 9 is parallel to and suspended from the outside of side sill 1-2. Its ends are connected to the input shaft of gearbox 3B via coupling 8 and axleboxes. Motor 9 drives the axleboxes and gearboxes at both ends, along with wheel assembly 3, through couplings 8 at both ends, transmitting traction and electric braking force to wheels 15.

[0030] The brake caliper 6 is fixedly connected to the outer shell of the axle box and the gear box 3B by bolts, and the brake disc 7 is fixedly connected to the outer end of the wheel core 3A by bolts. During mechanical braking, the brake caliper 6 clamps the brake disc 7 to achieve the purpose of transmitting the mechanical braking force to the wheel 15.

[0031] The four primary longitudinal tie rods 4 are symmetrically arranged, and one end of the four primary longitudinal tie rods 4 is fixedly connected to the axle bridge 2 near the axle seat 2A through a rubber node, and the other end is fixedly connected to the crossbeam 1-1 near the frame step 1-1-1 through a rubber node, thereby realizing the longitudinal and lateral positioning of the primary suspension.

[0032] The lower ends of the four steel springs of the secondary suspension spring group 10 are symmetrically fixed in pairs at the middle position of the two side beams 1-2, and the upper ends of the four steel springs are all fixed on the vehicle body frame 16; the lower ends of the two secondary vertical shock absorbers 11 are symmetrically fixed in the middle position of the two side beams 1-2 and located between the two steel springs, and the upper ends of the two secondary vertical shock absorbers 11 are all fixed on the vehicle body frame 16; one end of the traction rod 12 is fixed on the crossbeam 1-1, and the other end is fixed on the vehicle body frame 16; the transverse stop 13 is symmetrically fixed on the inner side walls of the two longitudinal beams 1-3 of the frame 1, and the two magnetic rail brakes 14 are suspended from the bottom of the frame 1 through the hanger fixed on the bottom of the axle seat 2A. The two magnetic rail brakes 14 are symmetrically arranged between the two wheels 15 on the same side parallel to the two longitudinal beams 1-3. The two magnetic rail brakes 14 are used to assist the brake caliper 6 and the brake disc 7 in vehicle braking.

[0033] The present invention's wheelchair-friendly low-floor tram bogie positions the axlebox and gearbox 3B outside the wheels 15, increasing the space inside the wheelbacks. This makes the aisle at the bogie sufficiently wide to accommodate wheelchairs, even with longitudinal steps 16A on either side of the aisle. Passengers in the seating area place their feet on these steps 16A, eliminating the need for seated passengers to move through the aisle, thus reducing inconvenience for seated passengers. The integration of the axlebox, gearbox, and wheel core allows for the limited lateral space between the wheels 15 and the body skirt 18, fulfilling the bogie's primary suspension load-bearing function and the drive unit's function of driving the wheelset.

Claims

1. A low-floor tram bogie suitable for wheelchair access, comprising: (1), a primary longitudinal tie rod (4), a primary suspension spring assembly (5), a brake caliper (6), a brake disc (7), a coupling (8), a motor (9), a secondary suspension spring assembly (10), a secondary vertical shock absorber (11), a traction tie rod (12), a lateral stop (13), a magnetic rail brake (14) and a wheel (15), characterized in that the bogie further includes an axle bridge (2) and an axle box, a gear box and a wheel core integrated body (3); A frame step (1-1-1) is provided at each of the transverse ends of the crossbeam (1-1) for avoiding a step (16A) of the vehicle body underframe (16); two axle bridges (2) are parallel to the crossbeam (1-1) and are arranged outside the crossbeam (1-1); and an axle seat (2A) is provided at each end of each axle bridge (2); Each axle box, gear box and wheel core integrated body (3) is an integrated structure composed of an axle box, gear box (3B) and a wheel core (3A) arranged along the transverse direction of the frame and having a compact structure. The wheel core (3A) is rotatably connected to the axle seat (2A) through a first bearing (19) and a second bearing (20). The axle box and gear box (3B) are located outside the wheel (15). The axle box and gear box (3B) are rotatably connected to the wheel core (3A) through a third bearing (21) and a fourth bearing (22). The lower ends of the four steel springs of the primary suspension spring group (5) are fixedly connected to the tops of the four axle boxes and the gear box (3B) in a one-to-one correspondence, and the four steel springs of the primary suspension spring group (5) are located in the four cap tubes (1-2-1) of the two side beams (1-2) of the frame (1) in a one-to-one correspondence; The motor (9) is parallel to the side beam (1-2) and is suspended on the outside of the side beam (1-2). The two ends of the motor (9) are respectively fixedly connected to the input shaft of the gear box (3B) through the coupling (8) and the axle box; the brake caliper (6) is fixedly connected to the outer shell of the axle box and the gear box (3B); the brake disc (7) is fixedly connected to the outer end of the wheel core (3A); Four primary longitudinal tie rods (4) are symmetrically arranged, one end of each of the four primary longitudinal tie rods (4) is fixedly connected to a position on the axle bridge (2) close to the axle seat (2A) through a rubber node, and the other end is fixedly connected to a position on the crossbeam (1-1) close to the frame step (1-1-1) through a rubber node. The lower ends of the four steel springs of the secondary suspension spring group (10) are symmetrically fixed to the middle positions of the two side beams (1-2), and the upper ends of the four steel springs are fixed to the vehicle body chassis (16); the lower ends of the two secondary vertical shock absorbers (11) are symmetrically fixed to the middle positions of the two side beams (1-2) and located between the two steel springs, and the upper ends of the two secondary vertical shock absorbers (11) are fixed to the vehicle body chassis (16); the traction rod (1 One end of the frame (2) is fixedly connected to the crossbeam (1-1), and the other end is fixedly connected to the vehicle body underframe (16); the transverse stopper (13) is symmetrically fixedly connected to the inner side walls of the two longitudinal beams (1-3) of the frame (1); two magnetic rail brakes (14) are hung below the frame (1) through a hanger fixedly connected to the bottom of the axle seat (2A); the two magnetic rail brakes (14) are symmetrically arranged between two wheels (15) on the same side, parallel to the two longitudinal beams (1-3).

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