CN107697091B - Compact bogie with built-in axle box for metro vehicle - Google Patents

Abstract

A compact bogie with built-in axle boxes for metro vehicles belongs to the field of bogie devices for railway vehicles and comprises two sets of driving devices, two sets of braking devices, two sets of wheel set devices, a compact casting framework, a compact secondary suspension system and two sets of axle box devices with built-in wheel sets, wherein each wheel set device comprises an axle and wheels which are symmetrically arranged at two ends of the axle, each driving device comprises a traction motor and a gear box, and each braking device comprises two sets of wheel set brakes. The invention greatly reduces the fixed wheelbase of the bogie while ensuring the structural strength, effectively reduces the rigidity of the swing angle of the wheel set and the torsional rigidity of the bogie, thereby reducing the turning radius of the bogie, improving the small curve passing capacity of the bogie, completely meeting the requirements of transverse shock absorption and collision avoidance on a curve bend, and saving the space occupied by the stop seat of the prior transverse buffer.

Description

Compact bogie with built-in axle box for metro vehicle

Technical Field

The invention belongs to the field of bogie devices for railway vehicles, and particularly relates to an axle box built-in compact bogie for a metro vehicle.

Background

The conventional bogie for railway vehicles is usually an axle box external bogie, as shown in fig. 1 to 3, a common axle box external bogie is an approximately H-shaped welded framework formed by two cross beams 1 and two side beams 3 together, the framework basically comprises two longitudinal beams 2, two cross beams 1 and the side beams 3 fixedly connected to two ends of the cross beams 1, the six cross beams are welded together to form an approximately capital letter H-shaped framework main body structure, each cross beam 1 comprises two seamless steel tubes 1-1, a gearbox hanging seat 1-2, a motor hanging seat 1-3 and a group of traction rod seats 1-4, the two seamless steel tubes 1-1 are parallel to each other, and the distance between the two seamless steel tubes is bridged and fixed through the two parallel longitudinal beams 2 respectively. Two crossbeams 1 and two longerons 2 enclose jointly and form a rectangle window area. The rectangular window area is used for accommodating and installing built-in traction pull rods and traction seats of a Z-shaped frame central window similar to that disclosed in Chinese patent CN 104442882, the built-in traction pull rods and the traction seats are parallel to each other and rotationally and symmetrically distributed by taking a vertical central Z axis of a bogie as a rotation central line, and two groups of two traction pull rods arranged in a Z shape are respectively hinged with corresponding traction pull rod seats 1-4. The gearbox hanging seat 1-2 and the motor hanging seat 1-3 are both positioned on the outer side of the beam 1, and a group of traction pull rod seats 1-4 are fixedly connected above the middle section of the beam 1 and positioned between the gearbox hanging seat 1-2 and the motor hanging seat 1-3. The two ends of a longitudinal beam 2 are fixedly connected with two cross beams 1 respectively, the middle section of the upper end of the longitudinal beam 2 is provided with a transverse buffer stop seat 2-1 of a framework, one end of each longitudinal beam 2 is provided with a transverse buffer seat 2-2, the transverse buffer stop seat 2-1 and the transverse buffer seat 2-2 are directly arranged on the upper end face of a rectangular window area of the framework, and the traditional transverse buffer device is of a bidirectional piston rod buffer structure, so that the H-shaped framework with a framework center window cannot use a sleeper beam structure. The two transverse beams 1 are rotationally symmetrical to each other at a circumferential angle of 180 DEG with respect to the vertical rotational axis Z of the frame, and the two longitudinal beams 2 are rotationally symmetrical to each other at the same rotational center and circumferential angle. The two transverse damper seats 2-2 are each provided for the installation of a corresponding transverse damper. The side beam 3 is a box-shaped integral welding structure which is formed by splicing, assembling and welding a plurality of plates and has a rectangular cross section, and generally comprises a secondary air spring seat 3-1 and two cantilevers, wherein a secondary air spring mounting hole 3-1-1 arranged in the middle of the secondary air spring seat 3-1 is directly used for being coaxially and fixedly connected with a secondary air spring, and the two cantilevers are respectively positioned at two ends of the secondary air spring mounting hole 3-1-1 and extend towards two sides to form a wing-shaped structure. Each cantilever comprises a braking hanging seat 3-4, a first series spring seat 3-3, a wing bridge section 3-2 and a wheel axle positioning seat 3-5, wherein the first series spring seat 3-3 is connected with a second series air spring seat 3-1 through the wing bridge section 3-2, the braking hanging seat 3-4 is fixedly connected to the inner side of the wing bridge section 3-2, and the wheel axle positioning seat 3-5 is fixedly connected to the lower part of the wing bridge section 3-2. The brake hanging seat 3-4 is composed of a brake hanging seat cantilever 3-4-1 and a brake hanging seat base 3-4-2. The outer side wall of the secondary air spring seat 3-1 is fixedly connected with an anti-snake-shaped shock absorber hanging seat 3-6 and an anti-side-rolling torsion rod seat 3-7 respectively. The two side beams 3 are symmetrical about an x axis of the whole structure of the bogie and are respectively and fixedly connected with two ends of the two cross beams 1 through respective secondary air spring seats 3-1.

However, the urban railway track environment with more curves and smaller turning radius of the line, such as the subway, has new high-standard requirements on technical parameters, such as the structure, the strength, the weight, the minimum curve radius and the like, of the bogie, for example, the design requirement of a newly-built subway project is provided, the static strength of the bogie frame under the impact load of 30g of equipment does not exceed 50% of the yield strength, and the minimum curve passing radius of the bogie is 36 meters. The conventional frame structure with external axle boxes as shown in fig. 1 to 3 can only satisfy the lower requirement of not exceeding 100% of the yield strength of the material under 20g impact load, the conventional frame structure with external axle boxes leads to wider wheel pair spacing, and the layout of the frame auxiliary mechanisms such as external axle boxes, motors and gear boxes cannot be further compressed and compacted, thus causing the overall structure of the bogie to occupy large space, large turning radius, heavy mass and high center of mass, and leading to the minimum curve passing radius of the bogie to be at least 100 meters, and in order to ensure the structural strength of the welding frame, the wall thickness of the steel plate is at least 20 millimeters, the average value of the overall weight of the bogie frame is about 1.6 tons, the axial span of two side beams 3 is at least 1800 millimeters, and the existing index parameters all lead the conventional frame with external axle boxes to be heavy, wide and the minimum curve radius cannot be further reduced, the design requirement of a novel subway line cannot be met, the fatigue strength of the welding line is inevitably reduced gradually along with the lapse of time, even cracks appear in the key welding line of the framework, and the driving safety is not facilitated.

Furthermore, the conventional traction rod, the transverse buffer stop seat 2-1 and the transverse damper seat 2-2 arranged in the central window of the frame of the bogie as shown in fig. 1 to 3 are all located inside the rectangular window at the center of the bogie frame, the layout mode makes the size of the frame unable to be further reduced, thereby the minimum curve passing radius of the frame unable to be further reduced, and the layout mode that two transverse dampers are respectively arranged on the diagonals of the rectangular window is usually only suitable for the bogie frame with the external axle box and the larger frame size and the larger weight, because the structural strength of the large-size frame is large, the large-size frame has wider layout space of accessory parts or a suspension or suspension arm structure with larger loading torque. And the secondary air spring seat 3-1 is directly arranged at the middle section of the side beam 3, so that the side beam directly bears the vertical vibration load of the secondary air spring, and the service life of the framework is not prolonged. The anti-snake-shaped shock absorber hanging seats 3-6 and the anti-side-rolling torsion bar seats 3-7 are symmetrically distributed on the outer sides of the two sets of side beams 3, the strength requirement on a stress structure of the framework is high, and the reduction of the weight of the framework and the reduction of the turning radius are not facilitated.

In addition, as shown in fig. 4, in the wheelset 6 of the conventional railway passenger car, in addition to the basic two wheels 6-1 and one axle 6-2, the wheelset 6 generally adopts an external axle box structure in which two conventional axle boxes 16 are respectively arranged at the outer ends of the corresponding axles 6-2, and the external axle box structure is usually directly linked with the spring seats 3-3 through vertical conical metal rubber springs or rigid spring type positioning structures embedded in the conventional axle boxes 16, and the conventional axle boxes 16 are exposed at the outer ends of the axles 6-2, so that the spacing span of the conventional axle boxes is large, the structure is not compact enough, the spacing of the conventional external axle boxes is large, the occupied space is large, and the minimum curve passing performance of the bogie is not improved.

Therefore, a novel axle box built-in compact subway bogie needs to be redesigned, a sleeper beam structure is additionally arranged, and the layout and assembly of a traction pull rod, a transverse vibration damper and a secondary air spring are comprehensively considered, so that the novel requirement of inter-city subway project design is met.

Disclosure of Invention

In order to solve the problems that the existing external axle box bogie with a central rectangular window is only suitable for rail vehicles such as a motor train unit and the like with high structural strength, large overall mass, abundant layout space of accessory equipment and larger minimum curve radius, an H-shaped framework structure with a framework central window needs a traditional built-in traction pull rod and a traction seat of a Z-shaped framework central window which are built in the central rectangular window, so that the H-shaped framework structure with the framework central window needs two sets of external snake-shaped shock absorbers and side roll torsion resistant rod seats which are externally arranged on side beams to be matched with the traditional built-in traction pull rod of the Z-shaped framework central window for use so as to eliminate overturning shock of the framework along the diagonal direction and snake-like torsion in the traveling direction, and therefore, a large axle box of the framework needs to be arranged on the outer side of a wheel pair, so that the overall structure of the bogie has large occupied space, large turning radius, heavy mass and high mass center, moreover, the wall thickness of a steel plate required by splicing, assembling and welding is at least 20 mm, the average value of the total weight of the bogie frame is about 1.6 tons, the axial span of two side beams is at least 1800 mm, the existing index parameters enable the traditional frame of the external axle box to be heavy and wide, the minimum curve radius can not be further reduced, the design requirement of a novel subway line can not be met, the fatigue strength of a welding seam of the axle box is inevitably reduced gradually along with the lapse of time, even the key welding seam of the frame is cracked, and the driving safety is not facilitated; the conventional axle box structure is exposed out of the outer end of the axle, so that the external axle box has larger transverse span, more occupied space and less compact structure; and the prior H-shaped welding frame with the external axle box can only meet the assessment parameters which do not exceed 100 percent of the yield strength of the material under the impact load of 20g, and the technical problems that the technical indexes such as strength, weight, minimum curve radius and the like of the prior frame structure with the external axle box can not meet the design requirements of new subway projects at the same time are solved.

The technical scheme adopted by the invention for solving the technical problem is as follows:

a built-in compact bogie of axle box for railcar, it includes two sets of drive arrangement, two sets of arresting gear and two sets of wheel set devices, and the wheel set device includes axletree and symmetrical arrangement at its both ends' wheel, and drive arrangement includes traction motor and gear box, and arresting gear includes two sets of wheel set braker, its characterized in that: the compact bogie with the built-in axle box further comprises a compact casting framework, a compact secondary suspension system and two sets of axle box devices with built-in wheel pairs;

the compact casting framework comprises a cross beam unit and two side beam units, wherein the two side beam units are arranged on two sides of the cross beam unit in parallel and symmetrically, and the two side beam units are integrally formed through a casting process;

the beam unit is a hollow rectangular box body, the center of the beam unit is provided with a center pin hole, and the two motor hanging seat units are rotationally and symmetrically arranged on two X axial outer side walls of the beam unit according to a circumferential angle of a degree by taking the axis of the center pin hole as an axis; the side beam unit is a hollow rectangular box body and comprises a side beam middle small cross beam and two trapezoidal axle box positioning frames, the two trapezoidal axle box positioning frames are symmetrically arranged at two ends of the side beam middle small cross beam, and the two trapezoidal axle box positioning frames are integrally formed by a casting process;

the middle small cross beam of the side beam comprises a current collector mounting seat, a sleeper beam connecting seat, two brake mounting seats, a side beam gear box hanging seat and two sleeper beam stoppers, and the seven small cross beams are integrally formed by casting technology; the sleeper beam connecting seat is arranged in the center of the upper end face of the small cross beam in the middle of the side beam, the current collector mounting seat is arranged in the center of the outer side wall of the small cross beam in the middle of the side beam, and the two brake mounting seats are symmetrically arranged on two sides of the current collector mounting seat;

the opening of the trapezoidal axle box positioning frame faces downwards, and a slope side wall on one waist line of a trapezoid of the trapezoidal axle box positioning frame is connected with the small cross beam in the middle of the side beam and is integrally formed; the lower parts of the two slope side walls of the trapezoidal axle box positioning frame are respectively provided with a coaxial horizontal through axle box positioning rod shaft hole;

the side beam gearbox hanging seat is arranged at the top end of one waist line of the trapezoidal axle box positioning frame, and the opening end of the side beam gearbox hanging seat vertically faces the end face of the side wall of the other side beam;

the side beam gearbox hanging seats on the two side beam units are rotationally and symmetrically arranged on two sides of the cross beam unit by 180-degree circumferential angles by taking the axis of the center pin hole as an axis; the two motor hanging seat units are distributed in a first quadrant and a third quadrant of the casting frame, the two side beam gearbox hanging seats are distributed in a second quadrant and a fourth quadrant of the casting frame, each side beam unit is only provided with a sleeper beam stop, and the sleeper beam stop is positioned above a connecting part of a small cross beam in the middle of the corresponding side beam and the trapezoidal axle box positioning frame; the sleeper beam stops on the two side beam units are respectively positioned in the third quadrant and the fourth quadrant of the cast framework;

the side wall of the traction motor is fixedly connected with a corresponding motor hanging seat unit, and the gear box is fixedly connected with a corresponding side beam gear box hanging seat through a gear box screw rod connecting seat of the gear box;

the wheel pair built-in axle box device comprises a trapezoidal axle box, two sets of ridge-shaped rubber spring pieces, a positioning towing rod, two rubber spring piece positioning clips and a semi-annular axle box anti-collision gasket; the middle section of the positioning towing rod is movably connected with the lower bottom surface of the trapezoidal axle box; two sets of ridge-shaped rubber spring pieces are respectively and fixedly connected to a waist line of the trapezoidal axle box in parallel through a corresponding rubber spring piece positioning clip; the lower end of the rubber spring piece positioning clip is fixedly connected with the upper bottom end part of the trapezoidal axle box, and the rubber spring piece positioning clip compresses the top end of the corresponding ridge-shaped rubber spring piece group obliquely along the outer side wall of the waist line of the trapezoidal axle box through a clamping jaw of the rubber spring piece positioning clip; the bottom of the ridge rubber spring piece is positioned on the base of the trapezoidal axle box;

the cross section of the trapezoid axle box is isosceles trapezoid, and a through axle assembling hole is formed in the center of the trapezoid axle box; the top ends of the outer side walls of the two waistlines of the trapezoidal axle box are respectively provided with a clamp mounting screw hole, and the bottom of the outer side wall is provided with an extension base; the middle part of the upper bottom of the trapezoidal axle box is provided with a vertical anti-collision backstop; a semi-annular anti-collision gasket mounting seat is arranged on the outer diameter of an axle assembling hole on the end face of the inner side of the trapezoidal axle box, and a circular anti-collision stop is arranged on the outer diameter of the axle assembling hole on the end face of the outer side of the trapezoidal axle box; the middle part of the rubber spring piece positioning clip is fixedly connected with a clip mounting screw hole through a bolt; two ends of the positioning drag rod are respectively inserted into a corresponding axle box positioning rod shaft hole and fixedly connected with the trapezoidal axle box positioning frame;

the compact secondary suspension system comprises a transverse shock absorber, an external double-traction pull rod at the same side, two double-bellows air springs, a compact sleeper beam, a double-elbow anti-side-rolling torsion bar and two vertical shock absorbers, wherein the compact sleeper beam comprises a sleeper beam base body, a transverse buffer, a sleeper beam core barrel, two traction pull rod hinged supports, two vertical shock absorber bases, two anti-side-rolling torsion bar bases, two framework connecting bases, two air spring mounting bases and two lifting bases, the sleeper beam base body is of a rectangular structure, and the two lifting bases are fixedly connected to two ends of the sleeper beam base body; the sleeper beam core cylinder is vertically and fixedly connected with the center of the lower end surface of the sleeper beam base body, and the transverse buffer is fixedly connected with the center of the upper end surface of the sleeper beam base body; the two traction pull rod hinged supports are symmetrically and fixedly connected to two ends of the same long edge of the sleeper beam base, each vertical shock absorber base is of a groove structure with an upward opening, and the side wall of a groove close to the outer side of each vertical shock absorber base is fixedly connected with the inner side wall of one corresponding traction pull rod hinged support;

the two framework connecting bases are symmetrically arranged at the bottom of the sleeper beam base body by using the central plane of the sleeper beam base body, the distance value between the framework connecting bases and the central plane of the sleeper beam base body is half of the distance value between the lifting seats on the same side and the central plane of the sleeper beam base body, and the length of the framework connecting bases is twice the width of the sleeper beam base body; the two air spring mounting seats are symmetrically arranged at the upper end of the sleeper beam base body by using the central plane of the sleeper beam base body; the air spring mounting seat is positioned between the framework connecting base and the vertical shock absorber base which are close to the air spring mounting seat; each side-rolling-resisting torsion rod seat is fixedly connected with the outer diameter edge of a corresponding air spring mounting seat, and the two side-rolling-resisting torsion rod seats are located on one side where the other long edge of the sleeper beam base body is located;

the double-elbow anti-side-rolling torsion bar comprises two hoop connecting seats, a double-elbow horizontal long shaft and two vertical anti-side-rolling torsion bars, the two hoop connecting seats are symmetrically and coaxially fixedly connected to two ends of a horizontal section of the double-elbow horizontal long shaft, and each hoop connecting seat is fixedly connected with one corresponding anti-side-rolling torsion bar seat; the two vertical anti-side-rolling torsion bars are fixedly connected with one corresponding elbow at two ends of the double-elbow horizontal long shaft respectively, and are arranged in parallel and upwards;

rubber nodes are arranged at two ends of a piston rod of the transverse shock absorber, one end of the piston rod of the transverse shock absorber is provided with a welding connection base with an inclination angle, and the other end of the piston rod of the transverse shock absorber is provided with a connecting seat of the vehicle body end of the transverse shock absorber; the welded connection base with the inclination angle is fixedly welded with a framework connection base on one side where the traction pull rod is located and the outer side wall of the adjacent sleeper beam base body; rubber nodes are arranged at two ends of a long rod of the external double-traction pull rod at the same side, one end of one traction pull rod is horizontally hinged with one corresponding traction pull rod hinged support through one rubber node in the Y-axis direction, and the other end of the traction pull rod is vertically connected with the bottom of the vehicle body through one rubber node in the Y-axis direction and the other corresponding traction pull rod hinged support;

the two vertical shock absorbers are respectively and vertically hinged with a corresponding vertical shock absorber base, and the two hyperbolic air springs are respectively and coaxially fixedly connected with a corresponding air spring mounting seat.

The sleeper beam base body, the sleeper beam core barrel, the two traction pull rod hinged seats, the two vertical shock absorber bases, the two anti-side rolling torsion rod bases, the two framework connecting bases, the two air spring mounting seats and the two lifting seats of the compact secondary suspension system are integrally formed by casting, the total weight of the sleeper beam base body is 460 kilograms, and the thickness of the cast wall is 16 millimeters; the distance between the vertical central planes of the two framework connecting bases is 1095 mm; the distance between the vertical central planes of the two traction pull rod hinged supports is 2370 mm; the distance between the vertical central planes of the two vertical shock absorber bases is 2010 mm; the distance between the two anti-side-rolling torsion bar seats and the vertical center plane is 1573 mm; the distance between the vertical central planes of the two framework connecting bases is 1116 mm; the axial line distance between the two air spring mounting seats is 1556 mm; the distance between the vertical central planes of the two hoisting seats is 2340 mm.

The transverse buffer comprises a base square box, two groups of width adjusting sheets, two rubber shock absorption cushion blocks and two groups of solder backing plates, wherein each rubber shock absorption cushion block and one corresponding width adjusting sheet are fixedly connected with one side wall of the base square box in sequence, and the two rubber shock absorption cushion blocks are symmetrical to each other; the other two side wall end surfaces of the square box of the base are fixedly connected with a corresponding solder backing plate in a welding way; the upper edge and the lower edge of the solder backing plate respectively form a filler gap with the upper end cover and the corresponding side wall of the square box of the base; the lower end of the square box of the base is fixedly connected with the center of the upper end surface of the sleeper beam base body in a welding mode.

The rubber shock absorption block of the rubber shock absorption cushion block is formed by vulcanizing a transverse metal shell end seat and a rubber block, the end head of the rubber shock absorption cushion block protrudes outwards from the opening end of the transverse metal shell end seat, and the protruding distance value is 1 cm.

The traction pull rod piston rod of the external double traction pull rod on the same side is a long-span rod structure with the length of 920 mm, and the two are both towards the positive direction of the X axis of the framework; the welding connection base with the inclination angle is perpendicular to the outer side wall of the adjacent sleeper beam base body, and the included angle between the welding connection base with the inclination angle and the vertical plane is 30 degrees; the plane where the two elbows of the double-elbow anti-side-rolling torsion bar are arranged is inclined downwards, and the included angle between the plane and the vertical plane is 65 degrees.

The wall thickness of the steel plate of the cross beam unit and the wall thickness of the steel plate of the two side beam units are both 16 mm, and the span between the two side beam units is 1165 mm.

The included angle between the waist line of the trapezoidal axle box and the lower bottom is 79 degrees; the distance between two trapezoidal axle boxes arranged on the same axle is 1165 mm; the cross section of the outer side wall is in a V shape with the left and right symmetry and the middle part connected, and the opening angle of the V-shaped cross section is 106 degrees.

Each ridge-shaped rubber spring piece consisting of the ridge-shaped rubber spring pieces is in a V shape with the cross section being bilaterally symmetrical and the middle part being connected, and the length, the width and the opening angle of each ridge-shaped rubber spring piece are matched with the outer side end face of the outer side wall; the plurality of ridge-shaped rubber spring pieces are stacked and fixedly connected to form a ridge-shaped rubber spring piece; the ridge-shaped rubber spring piece positioned on the innermost layer is matched and buckled with the corresponding outer side wall.

The invention has the beneficial effects that:

the compact sleeper beam is used for realizing the connection of a vehicle body and a compact casting framework, the hollow casting structures of the vehicle body and the compact casting framework can greatly reduce the weight while ensuring the structural strength, and the built-in axle box of the compact casting framework is required to be completely arranged inside the positioning frame of the trapezoidal axle box, so that a brand-new axle box built-in bogie layout structure is formed; the novel framework is integrally formed by a casting process, only a cylindrical central pin boss is reserved at the geometric center of the framework, original structures such as a middle rectangular window, a transverse shock absorber seat and a transverse framework stop which are formed by two transverse beams and two longitudinal beams in a surrounding mode are omitted, the fixed axle distance of the bogie can be greatly reduced while the structural strength is guaranteed, the span between the two side beam units is 1165 mm, the swing angle rigidity of a wheel pair and the torsion rigidity of the bogie are effectively reduced, the turning radius of the bogie is reduced, and the small curve passing capacity of the bogie is improved.

The new arrangement mode that the transverse buffer is positioned above the center of the sleeper beam effectively overcomes the problem that the existing transverse shock absorber seat does not exist due to the fact that the compact casting framework reduces the layout space and cancels the central rectangular window of the framework, meanwhile, the newly designed transverse buffer is small in size and high in strength, after the transverse buffer is inserted into a matching groove of a chassis of a vehicle body, the anti-collision requirements on transverse shock absorption and curve curves can be completely met, and the space occupied by the stop seat of the existing transverse buffer is saved.

The piston rod of the external double traction pull rod at the same side is a long-span rod structure with the length of 920 mm, and the two are both towards the positive direction of the X axis of the framework; take the welded connection base perpendicular to that inclination closes on sleeper beam base member lateral wall to the welded connection base that takes the inclination is 30 degrees with vertical planar contained angle, and it enables horizontal shock absorber and becomes the two-way shock attenuation buffer who compromises vertical Z axle direction and vertical Y axle direction, and has practiced thrift horizontal shock absorber's old length by a wide margin, promotes layout structure's compactness.

Compared with the traditional Z-shaped traction pull rod vertically arranged in the central rectangular window of the bogie, the large-span double-traction pull rod arranged outside the framework is equivalent to a novel traction pull rod structure with a larger size, and the traction pull rod structure can transfer stress more effectively due to the large increase of torque. The layout mode that the two traction pull rods face the X direction of the advancing train can effectively inhibit the effect that the train body twists back and forth along the X-axis direction of the advancing direction. The planes of the two elbows of the double-elbow anti-side-rolling torsion bar are inclined downwards, the two elbows can form resultant force transmission by the front and back twisting moment of the vehicle body along the forward X-axis direction and the vertical vibration moment in the vertical Z-axis direction, and energy absorption and buffering are respectively carried out through rubber nodes in the hoop connecting seat and rubber nodes at the end part of the vertical anti-side-rolling torsion bar, so that the damping effect of the double-curve-bag secondary air spring is assisted at another angle. The design enables the compact sleeper beam and the auxiliary damping parts thereof to achieve good all-around damping and buffering effects while greatly saving the layout space of equipment. The sleeper beam base body is a cast and molded rectangular plate-shaped closed empty box structure, contributes to weight reduction while guaranteeing structural strength, and simultaneously serves as an air supply channel for compressed air to supply air for the hyperbolic-bag air spring; in addition, compared with the traditional subway power bogie with the self-weight of at least 8-ton grade and the same passenger carrying capacity, the compact bogie with the built-in axle box of the subway vehicle and all the accessory parts thereof have the whole self-weight of only about 5.5 tons, so that the abrasion between the rail and the wheel tread is effectively reduced while the traction power is greatly saved, and the design service life of the wheel set and the rail is effectively prolonged.

With the continuous increase of urban subway lines, the intersection of underground lines and lines is not increased, and the influence of ground building foundations is added, so that the curve radius on the subway lines is inevitably reduced continuously in the future.

Drawings

FIG. 1 is a schematic perspective view of an external H-shaped welded frame of a conventional axle box;

FIG. 2 is a bottom view of an external H-shaped welded frame of a legacy axlebox;

FIG. 3 is a schematic perspective view of an external H-shaped welded frame of a conventional axle box from another perspective;

fig. 4 is a schematic perspective view of a conventional wheelset arrangement;

FIG. 5 is a schematic structural view of the compact bogie in the axle box for a subway vehicle according to the present invention;

FIG. 6 is a schematic illustration of the explosive assembly of FIG. 5;

FIG. 7 is a schematic perspective view of the compact casting frame of the present invention;

FIG. 8 is a top view of the compact casting frame of the present invention;

fig. 9 is a partially enlarged view of portion I of fig. 7;

fig. 10 is a schematic view of the assembly of two sets of wheelset built-in type axle box devices and one set of wheelset devices according to the present invention;

fig. 11 is a schematic structural view of the wheelset built-in type axle box device of the present invention;

FIG. 12 is a schematic perspective view of a trapezoidal shaped axlebox of the present invention;

FIG. 13 is a schematic view of a trapezoidal shaped axlebox of the present invention from another perspective;

FIG. 14 is a front view of a trapezoidal shaped axle housing of the present invention;

FIG. 15 is a schematic illustration of the explosive assembly of FIG. 11;

FIG. 16 is a front view of the ridge rubber spring plate of the present invention;

fig. 17 is a schematic view of the assembly of two sets of wheelset built-in type axle box units with one set of wheelset units and side beam units;

fig. 18 is a partial enlarged view of portion II of fig. 17;

FIG. 19 is a schematic perspective view of the compact secondary suspension system of the present invention;

FIG. 20 is a front view of the compact secondary suspension system of the present invention;

FIG. 21 is a top plan view of the compact secondary suspension system of the present invention;

FIG. 22 is a schematic illustration of the explosive assembly of FIG. 19;

FIG. 23 is a schematic bottom perspective view of the compact secondary suspension system of the present invention;

FIG. 24 is a schematic perspective view of a lateral bumper of the present invention;

FIG. 25 is an exploded assembly view of the lateral buffer of the present invention from a perspective;

figure 26 is a perspective view of a double-bend anti-roll torsion bar of the present invention;

FIG. 27 is a schematic illustration of the explosive assembly of FIG. 19;

FIG. 28 is a right side view of FIG. 19;

FIG. 29 is a schematic view of the assembly of the compact casting frame and compact secondary suspension system of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 4 to 29, the compact bogie with built-in axle boxes for metro vehicles of the present invention comprises two sets of driving devices 14, two sets of braking devices 15 and two sets of wheelset devices 6, a compact casting frame, a compact secondary suspension system and two sets of wheelset built-in axle box devices 7. The wheelset device 6 comprises an axle 6-2 and wheels 6-1 symmetrically arranged at two ends of the axle, the driving device 14 comprises a traction motor 14-1 and a gear box 14-2, and the braking device 15 comprises two groups of wheelset brakes which adopt conventional hydraulic brake shoe brakes.

The compact casting framework comprises a cross beam unit 4 and two side beam units 5, wherein the two side beam units 5 are arranged on two sides of the cross beam unit 4 in parallel and symmetrically, and the two side beam units 5 are integrally formed through a casting process.

The beam unit 4 is a hollow rectangular box body, the center of the box body is provided with a center pin hole 4-1, and the two motor hanging seat units 4-2 are rotationally and symmetrically arranged on two X axial outer side walls of the beam unit 4 according to a circumferential angle of 180 degrees by taking the axis of the center pin hole 4-1 as an axis. The side beam unit 5 is a hollow rectangular box body and comprises a side beam middle small cross beam 5-1 and two trapezoidal axle box positioning frames 5-2, the two trapezoidal axle box positioning frames 5-2 are symmetrically arranged at two ends of the side beam middle small cross beam 5-1, and the three are integrally formed by casting technology.

The side beam middle small cross beam 5-1 comprises a current collector mounting seat 5-1-1, a sleeper beam connecting seat 5-1-2, two brake mounting seats 5-1-3, a side beam gear box hanging seat 5-1-4 and two sleeper beam stoppers 5-1-5 which are integrally formed by casting technology. The sleeper beam connecting seat 5-1-2 is arranged in the center of the upper end face of the small middle cross beam 5-1 of the side beam, the current collector mounting seat 5-1-1 is arranged in the center of the outer side wall of the small middle cross beam 5-1 of the side beam, and the two brake mounting seats 5-1-3 are symmetrically arranged on two sides of the current collector mounting seat 5-1-1.

The opening of the trapezoidal axle box positioning frame 5-2 is downward, and the slope side wall on one waist line of the trapezoid is connected with the small cross beam 5-1 in the middle of the side beam and is integrally formed. The lower parts of two slope side walls of the trapezoidal axle box positioning frame 5-2 are respectively provided with a coaxial horizontal through axle box positioning rod axle hole 5-2-1.

The side sill gearbox hanger 5-1-4 is disposed at the top end of one of the waistlines of the ladder pedestal locating frame 5-2, and the open end of the side sill gearbox hanger 5-1-4 is directed perpendicularly toward the side wall end face of the other side sill.

The side beam gear box hanging seats 5-1-4 on the two side beam units 5 are arranged on both sides of the cross beam unit 4 in rotational symmetry with each other at a circumferential angle of 180 degrees around the axis of the center pin hole 4-1. Taking the XY-axis plane rectangular coordinate system shown in fig. 8 as a reference, setting the rectangular area at the upper right corner of the dot o as a first quadrant, setting the rectangular area at the upper left corner of the dot o as a second quadrant, and recurrently sequentially the third and fourth quadrants in the counterclockwise direction, then: the two motor hanging seat units 4-2 are distributed in the first quadrant and the third quadrant of the casting frame, the two side beam gearbox hanging seats 5-1-4 are distributed in the second quadrant and the fourth quadrant of the casting frame, each side beam unit 5 is only provided with one sleeper beam stop 5-1-5, and the sleeper beam stop 5-1-5 is located above the connecting portion of the small middle cross beam 5-1 of the corresponding side beam and the trapezoidal axle box positioning frame 5-2. The bolster stops 5-1-5 on the two side beam units 5 are located in the third and fourth quadrants of the cast frame, respectively.

The side wall of the traction motor 14-1 is fixedly connected with a corresponding motor hanging seat unit 4-2, and the gear box 14-2 is fixedly connected with a corresponding side beam gear box hanging seat 5-1-4 through a gear box screw rod connecting seat 14-2-1.

The wheel pair built-in axle box device 7 comprises a trapezoidal axle box 7-1, two sets of ridge-shaped rubber spring piece assemblies 7-2, a positioning towing rod 7-3, two rubber spring piece positioning clips 7-4 and a semi-annular axle box anti-collision gasket 7-5. The middle section of the positioning towing rod 7-3 is movably connected with the lower bottom surface of the trapezoidal axle box 7-1. Two sets of roof ridge-shaped rubber spring leaf assemblies 7-2 are respectively fixedly connected on a waist line of the trapezoidal axle box 7-1 in parallel through a corresponding rubber spring leaf positioning clip 7-4. The lower end of the rubber spring piece positioning clip 7-4 is fixedly connected with the upper bottom end part of the trapezoidal axle box 7-1, and the rubber spring piece positioning clip 7-4 presses the top end of the corresponding ridge-shaped rubber spring piece combination 7-2 along the outer side wall of the waist line of the trapezoidal axle box 7-1 to the inclined outer side through a clamping jaw. The bottom of the ridge-shaped rubber spring piece assembly 7-2 is positioned on the base of the trapezoidal axle box 7-1.

The cross section of the trapezoid axle box 7-1 is isosceles trapezoid, and the center of the trapezoid axle box 7-1 is provided with a through axle assembly hole 7-1-1. The top ends of the outer side walls 7-1-2 which are used as the two waistlines of the trapezoidal axle box 7-1 are respectively provided with a clamp mounting screw hole 7-1-2-1, and the bottom of the outer side wall 7-1-2 is provided with an extension base 7-1-2-2. The middle part of the upper bottom of the trapezoid axle box 7-1 is provided with a vertical crashproof stop 7-1-4. The outer diameter of an axle assembly hole 7-1-1 positioned on the end surface of the inner side of the trapezoid axle box 7-1 is provided with a semi-annular anti-collision gasket installation seat 7-1-3, and the outer diameter of an axle assembly hole 7-1-1 positioned on the end surface of the outer side of the trapezoid axle box 7-1 is provided with a circular anti-collision stop 7-1-5. The middle part of the rubber spring piece positioning clip 7-4 is fixedly connected with a clip mounting screw hole 7-1-2-1 through a bolt. Two ends of the positioning drag rod 7-3 are respectively inserted into a corresponding axle box positioning rod axle hole 5-2-1 and fixedly connected with the trapezoidal axle box positioning frame 5-2.

The compact secondary suspension system comprises a transverse shock absorber 8, an external double-traction pull rod 9 at the same side, two double-bellow air springs 10, a compact sleeper beam 11, a double-elbow anti-rolling torsion bar 12 and two vertical shock absorbers 13, wherein the compact sleeper beam 11 comprises a sleeper beam base body 11-1, a transverse buffer 11-2, a sleeper beam core barrel 11-3, two traction pull rod hinged seats 11-4, two vertical shock absorber bases 11-5, two anti-rolling torsion rod bases 11-6, two framework connecting bases 11-7, two air spring mounting bases 11-8 and two lifting bases 11-9, the sleeper beam base body 11-1 is of a rectangular plate-shaped hollow box structure, the structural strength of the hollow box structure is guaranteed, the weight of the hollow box structure is reduced, and the hollow box structure is used as an air supply channel for compressed air to supply air to the double-bellow air springs 10. Two lifting seats 11-9 are fixedly connected to two ends of the sleeper beam base body 11-1. The sleeper beam core barrel 11-3 is vertically and fixedly connected with the center of the lower end face of the sleeper beam base body 11-1, and the transverse buffer 11-2 is fixedly connected with the center of the upper end face of the sleeper beam base body 11-1. Two traction pull rod hinged supports 11-4 are symmetrically and fixedly connected to two ends of the same long edge of the sleeper beam base body 11-1, each vertical shock absorber base 11-5 is of an upward-opening groove structure, and the side wall of the groove close to the outer side of each vertical shock absorber base is fixedly connected with the inner side wall of one corresponding traction pull rod hinged support 11-4.

The two framework connecting bases 11-7 are symmetrically arranged at the bottom of the sleeper beam base body 11-1 by the central plane of the sleeper beam base body 11-1, the distance value between the framework connecting base 11-7 and the central plane of the sleeper beam base body 11-1 is half of the distance value between the lifting base 11-10 on the same side and the central plane of the sleeper beam base body 11-1, and the length of the framework connecting base 11-7 is twice the width of the sleeper beam base body 11-1. The two air spring installation seats 11-8 are symmetrically arranged at the upper end of the sleeper beam base body 11-1 by the central plane of the sleeper beam base body 11-1. The air spring mount 11-8 is located between its adjacent frame attachment base 11-7 and the vertical shock absorber base 11-5. Each side-rolling-resisting torsion bar seat 11-6 is fixedly connected with the outer diameter edge of a corresponding air spring mounting seat 11-8, and the two side-rolling-resisting torsion bar seats 11-6 are located on one side of the other long edge of the sleeper beam base body 11-1.

The double-elbow anti-rolling torsion bar 12 comprises two hoop connecting seats 12-1, a double-elbow horizontal long shaft 12-3 and two vertical anti-rolling torsion bars 12-2, the two hoop connecting seats 12-1 are symmetrically and coaxially fixedly connected to two ends of a horizontal section of the double-elbow horizontal long shaft 12-3, and each hoop connecting seat 12-1 is fixedly connected with a corresponding anti-rolling torsion bar seat 11-6. Two vertical anti-rolling torsion bars 12-2 are respectively fixedly connected with one corresponding elbow at two ends of the double-elbow horizontal long shaft 12-3, and the two vertical anti-rolling torsion bars 12-2 are arranged in parallel and upwards. The upper end of the vertical anti-rolling torsion bar 12-2 is hinged with the bottom of the vehicle body.

Two ends of the transverse shock absorber 8 are respectively provided with a rubber node, one end of the transverse shock absorber is provided with a welding connection base 8-1 with an inclination angle, and the other end of the transverse shock absorber is provided with a transverse shock absorber body end connection base 8-2. The welding connection base 8-1 with the inclination angle is fixedly connected with a framework connection base 11-7 on one side where the traction pull rod 9 is located and the outer side wall of the adjacent sleeper beam base body 11-1 in a welding mode. Two ends of a long rod of the external double-traction pull rod 9 at the same side are respectively provided with a rubber node, one end of one traction pull rod 9 is horizontally hinged with one corresponding traction pull rod hinged support 11-4 through a rubber node in the Y-axis direction, and the other end of the traction pull rod 9 is vertically connected with the bottom of the vehicle body through another corresponding traction pull rod hinged support 11-4 through a rubber node in the Y-axis direction.

Two vertical shock absorbers 13 are vertically hinged with a corresponding vertical shock absorber base 11-5 respectively, and two double-curve-bag air springs 10 are coaxially and fixedly connected with a corresponding air spring mounting seat 11-8 respectively.

A sleeper beam base body 11-1, a sleeper beam core barrel 11-3, two traction pull rod hinged seats 11-4, two vertical shock absorber bases 11-5, two anti-side rolling torsion rod bases 11-6, two framework connecting bases 11-7, two air spring mounting bases 11-8 and two lifting bases 11-10 of a compact secondary suspension system are integrally formed through casting, the total weight of the sleeper beam base body 11-1 is 460 kilograms, and the casting wall thickness is 16 millimeters. The distance between the vertical central planes of the two truss connection bases 11-7 is 1095 mm. The distance between the vertical central planes of the two traction pull rod hinged seats 11-4 is 2370 mm. The vertical center planes of the two vertical shock absorber bases 11-5 are spaced apart 2010 millimeters. The distance between the vertical center planes of the two anti-roll torsion bar seats 11-6 is 1573 mm. The spacing between the vertical center planes of the two frame connecting bases 11-7 is 1116 mm. The axial distance between the two air spring mounting seats 11-8 is 1556 mm. The distance between the vertical central planes of the two lifting seats 11-10 is 2340 mm.

The transverse buffer 11-2 comprises a base square box 11-2-1, two groups of width adjusting sheets 11-2-2, two rubber shock absorption cushion blocks 11-2-3 and two groups of solder backing plates 11-2-4, wherein each rubber shock absorption cushion block 11-2-3 and one corresponding width adjusting sheet 11-2-2 are fixedly connected with one side wall of the base square box 11-2-1 in sequence, and the two rubber shock absorption cushion blocks 11-2-3 are symmetrical to each other. The other two side wall end faces of the base square box 11-2-1 are fixedly connected with a corresponding solder pad 11-2-4 in a welding mode respectively. The upper edge and the lower edge of the solder pad 11-2-4 respectively form a filler gap with the upper end cover and the corresponding side wall of the square box 11-2-1 of the base. The lower end of the base square box 11-2-1 is fixedly connected with the center of the upper end face of the sleeper beam base body 11-1 in a welding mode.

The rubber shock absorption block of the rubber shock absorption cushion block 11-2-3 is formed by vulcanizing a transverse metal shell end seat 11-2-3-1 and a rubber block 11-2-3-2, the end head of the rubber shock absorption cushion block 11-2-3 protrudes outwards from the opening end of the transverse metal shell end seat 11-2-3-1, and the protruding distance is 1 cm. The transverse metal shell end seat 11-2-3-1 plays a limiting role in high-strength impact exceeding a limiting stroke, so that the rubber block 11-2-3-2 in the transverse metal shell is protected from being damaged. The new arrangement mode that the transverse buffer 11-2 is positioned above the center of the sleeper beam effectively solves the problem that the existing transverse buffer stop seat 2-1 is not existed due to the fact that the layout space of the axle box built-in subway casting bogie 4 is reduced and the central rectangular window is cancelled, meanwhile, the newly designed transverse buffer 11-2 is small in size, high in strength and easy to manufacture and install, after being inserted into the matching groove of the underframe of the car body, the anti-collision requirements on transverse shock absorption and curve curves can be completely met, and the space occupied by the old transverse buffer is greatly saved.

The traction pull rod piston rod of the external double traction pull rod 9 at the same side is a long-span rod structure of 920 mm, and the two are both towards the positive direction of the X axis of the framework. The welding connection base 8-1 with the inclination angle is perpendicular to the outer side wall of the adjacent sleeper beam base body 11-1, and the included angle between the welding connection base 8-1 with the inclination angle and a vertical plane is 30 degrees. The design enables the transverse shock absorber 8 to be a bidirectional shock absorption buffer device which gives consideration to the vertical Z-axis direction and the longitudinal Y-axis direction, greatly saves the old length of the transverse shock absorber, and improves the compactness of the layout structure. Compared with the old Z-shaped traction pull rod vertically arranged in the central rectangular window of the bogie, the large-span double-traction pull rod 9 arranged outside the framework is equivalent to a novel traction pull rod structure with a larger size for changing the whole compact sleeper beam 11, and the traction pull rod structure can more effectively transfer stress due to the great increase of the moment. The two traction pull rods face to the same direction, and the effect of restraining the front and back torsion of the vehicle body along the X-axis direction of the advancing direction is achieved to a certain extent.

The plane of the two bends of the double-bend anti-rolling torsion bar 12 is inclined downwards, and the included angle between the plane and the vertical plane is 65 degrees. The structure can enable a vehicle body to form resultant force transmission along the forward front and back twisting moment in the forward X-axis direction and the vertical vibration moment in the vertical Z-axis direction, and energy absorption and buffering are respectively carried out through rubber nodes in the hoop connecting seat 12-1 and rubber nodes at the end part of the vertical side rolling resistant torsion bar 12-2, so that the vibration absorption effect of the auxiliary vertical vibration absorber and the double-curve-bag secondary air spring 10 is realized at another angle. The hyperbolic air spring 10 is FD1330-80 hyperbolic air spring manufactured by Conditatch.

The wall thickness of the steel plate of the cross beam unit 4 and the two side beam units 5 is 16 mm, and the span between the two side beam units 5 is 1165 mm.

The included angle between the waist line of the trapezoidal axle box 7-1 and the lower bottom is 79 degrees. The two trapezoidal axle boxes 7-1 mounted on the same axle 6-2 are spaced 1165 mm apart. The cross section of the outer side wall 7-1-2 is in a V shape with symmetrical left and right and connected middle parts, and the opening angle of the V-shaped cross section is 106 degrees.

Each ridge-shaped rubber spring piece of the ridge-shaped rubber spring piece assembly 7-2 is in a V shape with the cross section being bilaterally symmetrical and the middle part being connected, and the length, the width and the opening angle of the ridge-shaped rubber spring piece are matched with the outer side end face of the outer side wall 7-1-2. A plurality of ridge-shaped rubber spring pieces are stacked and fixedly connected to form a ridge-shaped rubber spring piece assembly 7-2. The ridge-shaped rubber spring piece positioned on the innermost layer is matched and buckled with the corresponding outer side wall 7-1-2.

When the axle box built-in compact bogie for the metro vehicle is applied specifically, the vibration reduction action units in the transverse buffer 11-2, the double-elbow anti-rolling torsion bar 12, the vertical vibration absorber 13, the transverse vibration absorber 8 and the same-side external double-traction pull rod 9 can adopt oil cylinder dampers which are commonly used in the industry.

As shown in fig. 6 and 29, the gear box 14-2 is coaxially press-fitted on a given position of the axle 6-2, then the two sets of the trapezoidal axle boxes 7-1 are coaxially press-fitted with the axle 6-2 through bearings, then the assembly of other parts on the wheel pair built-in type axle box device 7 and the press-fitting of the wheels 6-1 to the end of the axle 6-2 are respectively completed, and then the two sets of the power wheel pair mechanisms which are completed with the pre-assembly are respectively installed in the corresponding four trapezoidal axle box positioning frames 5-2 on the side beam units 5. The traction motor 14-1 is fixedly connected with the motor hanging seat unit 4-2 and coaxially and rotatably connected with the middle section of the axle 6-2, then the axial outer side wall of the gear box 14-2 is transversely and fixedly connected with the inner side wall of the small middle cross beam 5-1 of the side beam adjacent to the gear box hanging seat unit, the upper end of the gear box 14-2 is vertically and fixedly connected with the gear box hanging seat 5-1-4 of the side beam, and the two ends of the positioning drag rod 7-3 are respectively and fixedly connected with the shaft holes 5-2-1 of the corresponding framework positioning rods. Thereafter, the two sets of brake devices 15 are respectively connected with the corresponding mounting seats on the side beam units 5 through bolts, and the clearance between the brake shoes and the wheels 6-1 is adjusted.

Then, a sleeper beam core tube 11-3 below the compact sleeper beam 11 is in press-fit shaft connection with a center pin hole 4-1 in the center of a cross beam unit 4 through a wear sleeve, two framework connection bases 11-7 below the compact sleeper beam 11 are respectively matched with sleeper beam connection seats 5-1-2 corresponding to the middle section of the side beam 3 through side bearing friction pairs, and then a transverse buffer 11-2, a double-elbow anti-rolling torsion bar 12, a vertical shock absorber 13, a transverse shock absorber 8 and a same-side external double-traction pull rod 9 are respectively and correspondingly connected with a butt joint structure on a vehicle body, so that the vehicle body and the compact casting framework can be connected through the compact secondary suspension system, and good omnibearing shock absorption and buffering effects can be still exerted while the layout space of equipment is greatly saved.

Claims (5)

1. The axle box built-in compact bogie for the metro vehicle comprises two sets of wheel set devices (6), two sets of driving devices (14) and two sets of braking devices (15), wherein each wheel set device (6) comprises an axle (6-2) and wheels (6-1) symmetrically arranged at two ends of the axle, each driving device (14) comprises a traction motor (14-1) and a gear box (14-2), each braking device (15) comprises two sets of wheel set brakes, and the axle box built-in compact bogie is characterized in that: the bogie also comprises a compact casting framework, a compact secondary suspension system and two sets of wheel set built-in type axle box devices (7);

the compact casting framework comprises a cross beam unit (4) and two side beam units (5), wherein the two side beam units (5) are arranged on two sides of the cross beam unit (4) in parallel and symmetrically and are integrally formed through a casting process;

the beam unit (4) is a hollow rectangular box body, the center of the beam unit is provided with a center pin hole (4-1), and the two motor hanging seat units (4-2) are rotationally and symmetrically arranged on two X axial outer side walls of the beam unit (4) according to a circumferential angle of 180 degrees by taking the axis of the center pin hole (4-1) as an axis; the side beam unit (5) is a hollow rectangular box body and comprises a side beam middle small cross beam (5-1) and two trapezoidal axle box positioning frames (5-2), the two trapezoidal axle box positioning frames (5-2) are symmetrically arranged at two ends of the side beam middle small cross beam (5-1), and the two trapezoidal axle box positioning frames are integrally formed by casting technology;

the side beam middle small cross beam (5-1) comprises a current collector mounting seat (5-1-1), a sleeper beam connecting seat (5-1-2), two brake mounting seats (5-1-3), a side beam gear box hanging seat (5-1-4) and two sleeper beam stoppers (5-1-5), and the seven parts are integrally formed by casting technology; the sleeper beam connecting seat (5-1-2) is arranged in the center of the upper end face of the small middle cross beam (5-1) of the side beam, the current collector mounting seat (5-1-1) is arranged in the center of the outer side wall of the small middle cross beam (5-1) of the side beam, and the two brake mounting seats (5-1-3) are symmetrically arranged on two sides of the current collector mounting seat (5-1-1);

the opening of the trapezoidal axle box positioning frame (5-2) faces downwards, and a slope side wall on one waist line of a trapezoid is connected with the small cross beam (5-1) in the middle of the side beam and is integrally formed; the lower parts of two slope side walls of the trapezoidal axle box positioning frame (5-2) are respectively provided with a coaxial horizontal through axle box positioning rod axle hole (5-2-1);

the side beam gearbox hanging seat (5-1-4) is arranged at the top end of one waist line of the trapezoid axlebox positioning frame (5-2), and the opening end of the side beam gearbox hanging seat (5-1-4) is vertically towards the end face of the side wall of the other side beam;

each side beam gearbox hanging seat (5-1-4) positioned on the two side beam units (5) takes the axis of the center pin hole (4-1) as an axis and is rotationally and symmetrically arranged at two sides of the cross beam unit (4) according to a circumferential angle of 180 degrees; the two motor hanging seat units (4-2) are distributed in the first quadrant and the third quadrant of the casting frame, the two side beam gearbox hanging seats (5-1-4) are distributed in the second quadrant and the fourth quadrant of the casting frame, each side beam unit (5) is only provided with one sleeper beam stop (5-1-5), and the sleeper beam stop (5-1-5) is positioned above the connecting part of the small middle cross beam (5-1) of the corresponding side beam and the trapezoidal axle box positioning frame (5-2); sleeper beam stoppers (5-1-5) on the two side beam units (5) are respectively positioned in the third quadrant and the fourth quadrant of the cast framework;

the side wall of the traction motor (14-1) is fixedly connected with a corresponding motor hanging seat unit (4-2), and the gear box (14-2) is fixedly connected with a corresponding side beam gear box hanging seat (5-1-4) through a gear box screw rod connecting seat (14-2-1) of the gear box;

the wheel pair built-in axle box device (7) comprises a trapezoidal axle box (7-1), two sets of ridge-shaped rubber spring pieces (7-2), a positioning towing rod (7-3), two rubber spring piece positioning clips (7-4) and a semi-annular axle box anti-collision gasket (7-5); the middle section of the positioning towing rod (7-3) is movably connected with the lower bottom surface of the trapezoidal axle box (7-1); two sets of ridge-shaped rubber spring leaf assemblies (7-2) are respectively fixedly connected to a waist line of the trapezoidal axle box (7-1) in parallel through a corresponding rubber spring leaf positioning clip (7-4); the lower end of the rubber spring piece positioning clip (7-4) is fixedly connected with the upper bottom end part of the trapezoidal axle box (7-1), and the rubber spring piece positioning clip (7-4) presses the top end of the corresponding ridge-shaped rubber spring piece assembly (7-2) to the inclined outer side along the outer side wall of the waist line of the trapezoidal axle box (7-1) through a clamping jaw of the rubber spring piece positioning clip; the bottom of the ridge-shaped rubber spring piece assembly (7-2) is positioned on the base of the trapezoidal axle box (7-1);

the cross section of the trapezoid axle box (7-1) is isosceles trapezoid, and a through axle assembly hole (7-1-1) is formed in the center of the trapezoid axle box (7-1); the top ends of the outer side walls (7-1-2) which are used as the two waist lines of the trapezoidal axle box (7-1) are respectively provided with a clamp mounting screw hole (7-1-2-1), and the bottom of the outer side wall (7-1-2) is provided with an extension base (7-1-2-2); the middle part of the upper bottom of the trapezoidal axle box (7-1) is provided with a vertical anti-collision backstop (7-1-4); a semi-annular anti-collision gasket mounting seat (7-1-3) is arranged on the outer diameter of an axle assembly hole (7-1-1) positioned on the end surface of the inner side of the trapezoid axle box (7-1), and a circular anti-collision stop (7-1-5) is arranged on the outer diameter of an axle assembly hole (7-1-1) positioned on the end surface of the outer side of the trapezoid axle box (7-1); the middle part of the rubber spring piece positioning clip (7-4) is fixedly connected with a clip mounting screw hole (7-1-2-1) through a bolt; two ends of the positioning drag rod (7-3) are respectively inserted into a corresponding axle box positioning rod axle hole (5-2-1) and fixedly connected with the trapezoidal axle box positioning frame (5-2);

the compact secondary suspension system comprises a transverse shock absorber (8), an external double-traction pull rod (9) arranged at the same side, two double-curve-bag air springs (10), a compact sleeper beam (11), a double-elbow anti-side-rolling torsion bar (12) and two vertical shock absorbers (13), the compact type sleeper beam (11) comprises a sleeper beam base body (11-1), a transverse buffer (11-2), a sleeper beam core barrel (11-3), two traction pull rod hinged seats (11-4), two vertical shock absorber bases (11-5), two anti-side rolling torsion rod bases (11-6), two framework connecting bases (11-7), two air spring mounting seats (11-8) and two lifting seats (11-9), wherein the sleeper beam base body (11-1) is of a rectangular structure, and the two lifting seats (11-9) are fixedly connected to two ends of the sleeper beam base body (11-1); the sleeper beam core barrel (11-3) is vertically and fixedly connected with the center of the lower end face of the sleeper beam base body (11-1), and the transverse buffer (11-2) is fixedly connected with the center of the upper end face of the sleeper beam base body (11-1); two traction pull rod hinged supports (11-4) are symmetrically and fixedly connected to two ends of the same long edge of the sleeper beam base body (11-1), each vertical shock absorber base (11-5) is of an upward-opening groove structure, and the side wall of a groove close to the outer side of each vertical shock absorber base is fixedly connected with the inner side wall of one corresponding traction pull rod hinged support (11-4);

the two framework connecting bases (11-7) are symmetrically arranged at the bottom of the sleeper beam base body (11-1) by the central plane of the sleeper beam base body (11-1), the distance value between the framework connecting bases (11-7) and the central plane of the sleeper beam base body (11-1) is half of the distance value between the lifting seats (11-9) on the same side and the central plane of the sleeper beam base body (11-1), and the length of the framework connecting bases (11-7) is twice the width of the sleeper beam base body (11-1); the two air spring mounting seats (11-8) are symmetrically arranged at the upper end of the sleeper beam base body (11-1) by the central plane of the sleeper beam base body (11-1); the air spring mounting seat (11-8) is positioned between the framework connecting base (11-7) and the vertical shock absorber base (11-5) which are adjacent to the air spring mounting seat; each side rolling resistance rod seat (11-6) is fixedly connected with the outer diameter edge of a corresponding air spring mounting seat (11-8), and the two side rolling resistance rod seats (11-6) are positioned on one side where the other long edge of the sleeper beam base body (11-1) is positioned;

the double-elbow anti-side-rolling torsion bar (12) comprises two hoop connecting seats (12-1), a double-elbow horizontal long shaft (12-3) and two vertical anti-side-rolling torsion bars (12-2), the two hoop connecting seats (12-1) are symmetrically and coaxially fixedly connected to two ends of a horizontal section of the double-elbow horizontal long shaft (12-3), and each hoop connecting seat (12-1) is fixedly connected with one corresponding anti-side-rolling torsion bar seat (11-6); two vertical anti-side-rolling torsion bars (12-2) are fixedly connected with one corresponding elbow at two ends of the double-elbow horizontal long shaft (12-3), and the two vertical anti-side-rolling torsion bars (12-2) are parallel and are arranged upwards;

rubber nodes are arranged at two ends of a piston rod of the transverse shock absorber (8), one end of the piston rod of the transverse shock absorber is provided with a welding connection base (8-1) with an inclination angle, and the other end of the piston rod of the transverse shock absorber is provided with a connecting base (8-2) at the vehicle body end of the transverse shock absorber; the welding connection base (8-1) with the inclination angle is fixedly connected with a framework connection base (11-7) on one side where the traction pull rod (9) is located and the outer side wall of the adjacent sleeper beam base body (11-1) in a welding mode; rubber nodes are arranged at two ends of a long rod of the external double-traction pull rod (9) at the same side, one end of one traction pull rod (9) is horizontally hinged with one corresponding traction pull rod hinged support (11-4) through one rubber node in the Y-axis direction, and the other end of the traction pull rod is vertically connected with the bottom of the vehicle body through one rubber node in the Y-axis direction and the other corresponding traction pull rod hinged support (11-4);

the two vertical shock absorbers (13) are respectively vertically hinged with a corresponding vertical shock absorber base (11-5), and the two hyperbolic air springs (10) are respectively coaxially and fixedly connected with a corresponding air spring mounting seat (11-8);

the traction pull rod piston rod of the external double traction pull rod (9) at the same side is a long-span rod structure with the length of 920 mm, and the two traction pull rods face to the positive direction of the X axis of the framework; the welding connection base (8-1) with the inclination angle is perpendicular to the outer side wall of the adjacent sleeper beam base body (11-1), and the included angle between the welding connection base (8-1) with the inclination angle and a vertical plane is 30 degrees; the plane where the two elbows of the double-elbow anti-side-rolling torsion bar (12) are arranged is inclined downwards, and the included angle between the plane and the vertical plane is 65 degrees;

the included angle between the waist line of the trapezoidal axle box (7-1) and the lower bottom is 79 degrees; the distance between two trapezoidal axle boxes (7-1) arranged on the same axle (6-2) is 1165 mm; the cross section of the outer side wall (7-1-2) is in a V shape with the left and right symmetry and the middle part connected, and the opening angle of the V-shaped cross section is 106 degrees.

2. The in-axle compact bogie for metro vehicles according to claim 1, wherein: the sleeper beam base body (11-1), the sleeper beam core barrel (11-3), the two traction pull rod hinged bases (11-4), the two vertical shock absorber bases (11-5), the two anti-side rolling torsion rod bases (11-6), the two framework connecting bases (11-7), the two air spring mounting bases (11-8) and the two lifting bases (11-9) of the compact secondary suspension system are integrally formed through casting, the total weight of the sleeper beam base body (11-1) is 460 kilograms, and the casting wall thickness is 16 millimeters; the distance between the vertical central planes of the two framework connecting bases (11-7) is 1095 mm; the distance between the vertical central planes of the two traction pull rod hinged seats (11-4) is 2370 mm; the distance between the vertical central planes of the two vertical shock absorber bases (11-5) is 2010 mm; the distance between the vertical center planes of the two anti-side-rolling torsion bar seats (11-6) is 1573 mm; the distance between the vertical central planes of the two framework connecting bases (11-7) is 1116 mm; the axial distance between the two air spring mounting seats (11-8) is 1556 mm; the distance between the vertical central planes of the two lifting seats (11-9) is 2340 mm.

3. The in-axle compact bogie for metro vehicles according to claim 1 or 2, wherein: the transverse buffer (11-2) comprises a base square box (11-2-1), two groups of width adjusting sheets (11-2-2), two rubber shock absorption cushion blocks (11-2-3) and two groups of solder backing plates (11-2-4), wherein each rubber shock absorption cushion block (11-2-3) and one corresponding width adjusting sheet (11-2-2) are fixedly connected with one side wall of the base square box (11-2-1) in sequence, and the two rubber shock absorption cushion blocks (11-2-3) are symmetrical to each other; the other two side wall end faces of the base square box (11-2-1) are fixedly connected with a corresponding solder pad (11-2-4) in a welding mode respectively; the upper edge and the lower edge of the solder pad (11-2-4) respectively form a filler gap with the upper end cover and the corresponding side wall of the base square box (11-2-1); the lower end of the base square box (11-2-1) is fixedly connected with the center of the upper end face of the sleeper beam base body (11-1) in a welding mode.

4. The in-axle compact bogie for metro vehicles according to claim 3, wherein: the rubber shock absorption block of the rubber shock absorption cushion block (11-2-3) is formed by vulcanizing a transverse metal shell end seat (11-2-3-1) and a rubber block (11-2-3-2), the end head of the rubber shock absorption cushion block (11-2-3) protrudes outwards from the opening end of the transverse metal shell end seat (11-2-3-1), and the protruding distance value is 1 cm.

5. The in-axle compact bogie for metro vehicles according to claim 1, wherein: each ridge-shaped rubber spring piece of the ridge-shaped rubber spring piece assembly (7-2) is in a V shape with the cross section being bilaterally symmetrical and the middle part being connected, and the length, the width and the opening angle of each ridge-shaped rubber spring piece are matched with the outer side end face of the outer side wall (7-1-2); a plurality of ridge-shaped rubber spring pieces are stacked and fixedly connected to form a ridge-shaped rubber spring piece assembly (7-2); the ridge-shaped rubber spring piece positioned on the innermost layer is matched and buckled with the corresponding outer side wall (7-1-2).