CN115465014A

CN115465014A - Low-floor tramcar wheel set and bogie with same

Info

Publication number: CN115465014A
Application number: CN202211171573.1A
Authority: CN
Inventors: 强锋; 高纯友
Original assignee: CRRC Changchun Railway Vehicles Co Ltd
Current assignee: CRRC Changchun Railway Vehicles Co Ltd
Priority date: 2022-09-26
Filing date: 2022-09-26
Publication date: 2022-12-13

Abstract

The invention discloses a low-floor tramcar wheel set and a bogie with the same, wherein the wheel set comprises: an axle and wheels mounted on both ends of the axle; the wheels are elastic wheels; the hub of the wheel is in interference fit with the axle; a rim is sleeved outside the hub, an elastic element is arranged between the hub and the rim, and a pressure ring for synchronously supporting the elastic element is sleeved on the hub; the hub comprises a body and a web formed circumferentially outside the body; the bogie disclosed by the invention avoids a bogie body by matching the wheels and the axle box devices, so that the use requirement that the width of a vehicle body passageway is not less than 600mm is met, the wheels and the axle adopt an interference fit installation mode, the axle box devices are allowed to intrude into the wheels, the structural reliability is good, the use safety coefficient is high, and the space utilization rate between two wheels in the wheel pair is greatly improved.

Description

Low-floor tramcar wheel set and bogie with same

Technical Field

The invention relates to the technical field of rail transit vehicle bogies, in particular to a low-floor tramcar wheel set and a bogie with the wheel set.

Background

In recent years, the domestic and foreign low-floor tramcar market has strong demand for 100% low-floor tramcars with rotatable wheel-set type bogies, currently, few companies with 100% low-floor rotatable bogies are internationally available, and the existing 100% low-floor rotatable bogies have different degrees of defects;

in a prior art, chinese patent application No. CN201310240074.8, application No. 20130618, and publication No. CN103507822B, "bogie for railway vehicle with improved suspension system, especially low-floor railway vehicle", the bogie has two wheel loose axle wheel pairs, wheels of each wheel pair are connected with each other by an axle structure, that is, one wheel is connected with a short axle through a bolt, the short axles at two sides are connected through a non-rotating bearing axle in the middle, and the short axles at the left and right sides are rotated through a rotating torsion bar axle embedded in the bearing axle, so that the wheels are rotated, and the axle structure has an axle box for each wheel of the corresponding wheel pair. The bogie has an articulated frame, each axle structure being supported by the articulated frame via a tie-down suspension. For each wheel, a primary suspension device has an arm extending substantially longitudinally between a first end integrally connected to an axle housing associated with the wheel and a second free end. The arm is hinged between its first and second ends about a pivotal connection to the frame. For each arm, a main coil spring extends between a first seat provided on the second end of the arm and a second seat carried by the frame. The bogie has a complex structure, resulting in low reliability;

in another wheel pair type rotatable bogie in the prior art, a primary suspension device of the other wheel pair type rotatable bogie adopts a traditional herringbone spring (two laminated rubber springs on the left and the right of an axle box are arranged in a herringbone manner), so that the axle box and the primary suspension at the end part of the bogie limit the rotation of a vehicle body relative to the bogie, the width of a passageway in the vehicle above the bogie is only about 500mm, and the requirement of international market on the width of a passageway in the vehicle is not less than 600mm is not met;

in addition, the prior art is influenced by the structural characteristics of the elastic wheel, so that the prior bogie can not meet the requirement that the width of an in-vehicle channel is not less than 600mm, the elastic wheel in the prior art is mainly divided into two types, wherein one type of elastic wheel hub is in interference fit with an axle, a web plate is positioned in the middle of a rim and the hub, the position space of the web plate of the wheel is limited and is not enough to allow an axle box device to be embedded into the wheel, the other type of elastic wheel hub is connected with the axle by adopting a flange bolt, and the elastic wheel in the structure allows the axle box to be embedded into the web plate of the wheel, but the safety and the reliability of the connection mode are low;

therefore, in order to solve the problems, the invention provides a low-floor tramcar wheel set and a bogie with the wheel set, which can meet the use requirement that the width of a vehicle body passageway is not less than 600mm, have simple structure, high reliability and safety and low failure rate, and are necessary.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide a low-floor tramcar wheel set and a bogie with the wheel set, wherein the bogie is a rotatable wheel set type 100% low-floor bogie, the bogie does not interfere with a vehicle body underframe aisle when passing through a small curve under any state of a vehicle on the premise of ensuring the minimum aisle width of a 600mm vehicle body, wheels and axles in the wheels are in interference fit, an axle box device is allowed to intrude into the wheels, the structure reliability is good, the use safety coefficient is high, and the space utilization rate between the two wheels in the wheel set is greatly improved.

In order to achieve the above purpose, the invention provides the following technical scheme:

the invention discloses a low-floor tramcar wheel set, which comprises:

an axle and wheels mounted on both ends of the axle;

the wheels are elastic wheels;

the hub of the wheel is in interference fit with the axle;

a rim is sleeved outside the hub, an elastic element is arranged between the hub and the rim, and a pressure ring for synchronously supporting the elastic element is sleeved on the hub;

the hub comprises a body and a web formed circumferentially outside the body;

and one side of the web plate is formed with a C-shaped groove structure for accommodating the axle box device.

Further, the web includes a first plate body extending in a radial direction of the axle and a second plate body connected to the first plate body and extending in a circumferential direction of the axle;

the first plate body and the second plate body form the groove structure, and the first plate body is offset from the side of the rim radial central axis away from the axle box device.

Further, the included angle between the first plate body and the second plate body is not less than 90 degrees.

Further, the body is located groove structure side is formed with concave in the inside first bellying of groove structure, through first bellying tip and bearing contact, the body is kept away from first bellying side is formed with protrusion in the outside second bellying of web, second bellying internal diameter with first bellying internal diameter with axletree interference fit, second bellying external diameter be formed with the slope upwards extend and with the transition face that the web is connected.

The invention discloses a low-floor tramcar bogie, which comprises:

the low-floor tramcar wheel set is characterized by comprising a wheel set body;

a frame mounted between two sets of said wheel pairs;

an axle box assembly connecting said wheel sets and said frame; and

a primary suspension disposed between the axle housing assembly and the frame;

the axle box devices are arranged on the axles and positioned on the inner sides of the wheels, and the two axle box devices on each group of wheel pairs are symmetrically arranged along the longitudinal axis of the framework;

the axle box body of the axle box device is provided with a first connecting end which is rotationally connected with the axle, a second connecting end which is arranged above the framework and a connecting middle section which is connected between the first connecting end and the second connecting end and is connected with the framework;

the second connecting end and the upper surface of the framework form the primary suspension;

one side of the axle housing body is disposed within the recessed configuration in an intruding manner and the other side of the axle housing body extends obliquely from the first connection end toward the second connection end such that the two opposing axle housing assemblies on the axle are disposed on the frame longitudinal axis side in a flared configuration.

Further, the first connecting end is provided with a first side surface at the wheel side and a second side surface away from the wheel side;

the first side is positioned within the wheel in an intrusive manner;

the second side extends obliquely from the first connection end toward the second connection end;

the second connecting end is offset to the frame longitudinal axis side with respect to the first side face and extends toward the frame lateral axis direction so as to be away from the axle.

Further, the primary suspension has a series of springs with axes parallel to the vertical frame axis, supported vertically by the series of springs between the frame and the second connecting end of the axle housing.

Furthermore, a base is arranged at the lower part of the connecting middle section and is connected with the framework through a positioning structure;

the framework is located the wheel opposite side has linked firmly the rocking arm with the form of cantilever, the rocking arm is followed the framework end upwards extends aslope, the rocking arm end through one be location node with the base is connected.

Further, the middle part of the framework is provided with a mounting area with a hollow structure so as to be used for accommodating a traction device for connecting the framework and the secondary suspension.

Further, a bearing surface is formed on the upper surface of the framework, the primary suspension and the secondary suspension are supported through the bearing surface, and the lower ends of the primary suspension and the secondary suspension are coplanar.

In the technical scheme, the low-floor tramcar wheel pair and the bogie with the wheel pair have the advantages that:

compared with the prior art, the low-floor tramcar wheel set and the bogie with the wheel set are designed;

firstly, a part of a first connecting end of an axle box body, which is positioned at the wheel side, is arranged in a wheel groove structure in an intruding mode, an axle bearing wheels and an axle box device is optimized in a wheel pair through the matching of the wheels and the axle box body, the axle structure is greatly optimized, the wheels and the axle adopt an interference fit installation mode, and the axle box device is allowed to intrude into the wheels, so that the structure reliability is good, the use safety coefficient is high, the space utilization rate between the two wheels in the wheel pair is greatly improved, meanwhile, the elastic wheels and the axle adopt the interference fit, the wheels are prevented from being connected with an axle bridge through bolts, the bolts are prevented from being broken and loosened, and the reliability and the safety coefficient are improved;

secondly, the second side surface of the first connecting end of the axle box body, which is far away from the wheel side, extends towards the second connecting end from the first connecting end in an inclined manner, so that two opposite axle box devices on the axle are positioned on the longitudinal axis side of the framework to form a horn-shaped structure, the second connecting end is offset from the longitudinal axis side of the framework relative to the first side surface of the first connecting end, so that wheels are matched with the axle box body to provide a larger free rotation space for a vehicle body passageway, the distance between the first connecting ends of the two axle box devices is increased to the maximum extent, a spring is offset from the transverse center line of the axle and is close to the center of the framework, and the end part (namely a cantilever) of a longitudinal beam of the framework is arranged below the axle box body, so that the upper space of the connecting middle section of the axle box body is larger, the rotation space of the vehicle body passageway is further increased, the span width in the end part of the bogie is increased, and the rotation space of the vehicle body passageway in the end part area of the bogie is increased;

the bogie is matched with the axle box body through wheels and the axle box body and matched with the frame through the primary suspension, so that when a vehicle passes through a small curve, the frame, the axle box and the primary suspension of the bogie can avoid interference with a vehicle body passageway which rotates relative to the frame and is vertically embedded into the bogie, and the use requirements that the maximum longitudinal gradient of a passing channel in a 100% low-floor tramcar adopting the wheel pair type rotary bogie is not more than 8% and the width of the vehicle body passageway is not less than 600mm are met;

compared with the prior art, the low-floor tramcar wheel set and the bogie with the wheel set have the advantages of being simple in structure, high in reliability and low in failure rate.

Drawings

In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings required in the embodiments will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to these drawings.

FIG. 1 is an isometric view of an integrated bogie frame assembly for a low-floor tram, as disclosed in the present invention;

FIG. 2 is another perspective view of the whole bogie frame assembly of the low-floor tramcar disclosed by the invention;

FIG. 3 is a top view of a low floor tram truck frame assembly as disclosed in the present invention;

FIG. 4 is a bottom view of the low floor tram truck frame assembly of the present disclosure;

FIG. 5 is a cross-sectional view of a low floor tram truck frame assembly along the longitudinal axis of the frame, in accordance with the present disclosure;

FIG. 6 is a partial cross-sectional view of a low-floor tram truck frame assembly taken along a frame transverse axis in accordance with the present disclosure;

fig. 7 is a cross-sectional view of a wheel pair consisting of the bogie frame of the low-floor tramcar disclosed by the invention.

Description of the reference numerals:

a wheel set 10; an axle 11; a wheel 12; a hub 121; a first plate 1211; a second plate 1212; a flange 1213; a first boss 1214; a second boss 1215; a transition surface 1216; an elastic member 122; a rim 123; a pressure ring 124; a first mating face 125; a second mating face 126;

an axle box device 20; a shaft case 21; a first connection end 211; a first side 2111; a second side 2112; a second connection end 212; a connection mid-section 213; an extension section 214; a spring seat body 215; a base 216; positioning holes 2161; a receiving groove 2162; a bearing 22;

a frame 30; the longitudinal beam 31; a cross member 32; the first connecting seat 321; a swivel arm 33; a mounting hole 331; a mounting area 35; a bearing surface 36;

a primary suspension 40; a tie spring 41; a positioning node 42;

a secondary suspension 50; a secondary spring 51; a bolster 52; a second connecting seat 521; a slewing support bearing 53;

a traction device 60; a first traction link 61a; a second traction link 61b; a fixed end 611; a movable end 612; a first lateral shock absorber 62a; a second lateral damper 62b;

a longitudinal driving device 70;

a hydraulic brake device 80;

a first diagonal a;

a second diagonal b.

Detailed Description

In order to make the technical solutions of the present invention better understood, those skilled in the art will now describe the present invention in further detail with reference to the accompanying drawings.

As shown in FIGS. 1-7;

the invention relates to a wheel pair of a low-floor tramcar and a bogie with the wheel pair, which are arranged at the lower part of a car body of a 100 percent low-floor tramcar, wherein the running speed of the tramcar is 100 kilometers per hour, and the wheel pair can be also suitable for the low-floor tramcar with the speed of more than or less than 100 kilometers per hour according to the use requirement without being limited to 100 kilometers per hour;

as shown in fig. 7;

a low-floor tramcar wheel set 10 comprises

An axle 11 and wheels 12 mounted on both ends of the axle 11;

the wheel 12 is an elastic wheel;

the hub 121 of the wheel 12 is in interference fit with the axle 11 through the axle hole;

a rim 123 is sleeved outside the hub 121, an elastic element 122 is installed between the hub 121 and the rim 123, and a pressing ring 124 for synchronously supporting the elastic element 122 is further sleeved on the hub 121;

the hub 121 includes a body and a web formed circumferentially outside the body;

the web is formed with a C-like recess structure on one side for receiving the axle housing assemblies 20, thereby expanding the span of the axle 11 between two axle housing assemblies 20 inside the wheel 12 and increasing the turning space of the body passageway in the end region of the bogie.

As shown in fig. 7;

preferably, the web includes a first plate 1211 extending in a radial direction of the axle 11 and a second plate 1212 connected to the first plate 1211 and extending in a circumferential direction of the axle 11;

first plate 1211 and second plate 1212 form a groove structure, and first plate 1211 is offset from the side of the radial center axis of rim 123 away from axle box assembly 20. An included angle between the first plate 1211 and the second plate 1212 is not less than 90 °, so as to form a C-shaped groove structure, that is, the first plate 1211 protrudes toward the outer side of the wheel 12, so as to avoid the axle box devices 20, and the axle box devices 20 are embedded into the wheel 12, so as to increase the transverse distance between the axle box devices 20 at the left and right ends of the axle 11, and to increase the turning space of the vehicle body aisle in the matching area between the axle box devices 20 and the axle 11, thereby realizing a larger turning space of the vehicle body aisle relative to the bogie;

a flange 1213 is connected to the end of the second plate 1212 remote from the first plate 1211, the press ring 124 is fixedly connected to the outside of the second plate 1212 and forms a first fitting surface 125 with a V-shaped structure recessed toward the axle 11 with the flange 1213 for supporting the elastic element 122, the elastic element 122 is a rubber member capable of elastically deforming, and the inner diameter of the rim 123 forms a second fitting surface 126 with a V-shaped structure protruding toward the axle 11 for contacting with the upper surface of the elastic element 122;

as shown in fig. 7;

preferably, the body is provided with a first lug 1214 recessed in the groove structure at the side of the groove structure, the end of the first lug 1214 is contacted with the bearing 22, the body is provided with a second lug 1215 protruding out of the web at the side far away from the first lug 1214, the inner diameter of the second lug 1215 and the inner diameter of the first lug 1214 are in interference fit with the axle 11, and the outer diameter of the second lug 1215 is provided with a transition surface 1216 extending obliquely upwards and connected with the web. That is, the second lug 1215 has a thinner wall thickness at one end and a thicker wall thickness at the other end, and the wall thickness at the end of the second lug 1215 is less than the thickness of the end connected to the web, which facilitates increasing the wall thickness of the second lug 1215 through the transition surface 1216, thereby improving the structural strength and reliability between the body of the wheel 12 and the web.

See fig. 1, 2;

the invention provides a low-floor tramcar bogie, comprising:

the wheel set 10, a frame 30 bridged between two wheel sets 10, an axle box device 20 connecting the wheel set 10 and the frame 30, a secondary suspension 50 connecting the frame 30 and a vehicle body, and a primary suspension 40 arranged between the axle box device 20 and the frame 30;

the axle box devices 20 are arranged on the axle 11 and positioned at the inner sides of the wheels 12, and the two axle box devices 20 on each group of wheel pairs 10 are symmetrically arranged along the longitudinal axis of the framework 30;

the axle box body 21 of the axle box device 20 has a first connection end 211 rotatably connected to the axle 11, a second connection end 212 disposed above the frame 30, and a connection middle section 213 connected between the first connection end 211 and the second connection end 212 and connected to the frame 30;

as shown in fig. 3;

the first connection end 211 of the axle box body 21 is rotatably connected with the axle 11 through a bearing 22, and the first connection end 211 is provided with a first side surface 2111 at the side of the wheel 12 and a second side surface 2112 at the side far away from the wheel 12;

the first side 2111 is arranged inside the wheel 12 in an intruding manner, the wheel 12 is arranged on the side of the axle box body 21 to form a groove structure for accommodating a part of the first connecting end 211 of the axle box body 21, so that the distance between the two axle box devices 20 is increased, and the rotating space of the vehicle body passageway is correspondingly increased;

the second side 2112 extends from the first connection end 211 toward the second connection end 212 in an inclined manner, so that two opposite axle box devices 20 on the axle 11 are located on the longitudinal axis side of the frame 30 to form a flared configuration, that is, the distance between the first connection ends 211 of the two axle box devices 20 is greater than the distance between the second connection ends 212, thereby increasing the span width in the end of the bogie, further increasing the turning space of the body aisle in the end region of the bogie, and further enabling the 600mm width body aisle not to interfere with the bogie when the adaptive vehicle passes through a small curve;

see fig. 3, 5;

a second connecting end 212 of the axle box body 21 is offset to the longitudinal axis side of the frame 30 with respect to the first side surface 2111 and extends toward the lateral axis direction of the frame 30 so as to be away from the axle 11, a primary suspension 40 is formed between the second connecting end 212 and the frame 30, the primary suspension 40 having a primary spring 41 with an axis parallel to the vertical axis of the frame 30, and is vertically supported between the frame 30 and the axle box body 21 by the primary spring 41;

the end of the second connecting end 212 is formed with an extending section 214 extending upward, the extending section 214 is connected to a spring seat 215 for connecting a series of springs 41, and the height of the spring seat 215 is increased by the extending section 214, so that a series of springs 41 with a larger vertical (Z-axis) dimension can be mounted, and a small series of suspension 40 is vertically rigid;

see fig. 2 and 4;

a base 216 is arranged at the lower part of the connecting middle section 213 of the axle box body 21, and the base 216 is connected with the framework 30 through a positioning structure;

the positioning structure includes a positioning hole 2161 and a receiving groove 2612 formed on the base 216;

a positioning hole 2161 with a U-shaped structure is formed on the lower surface of the base 216, and the accommodating groove 2162 penetrates through the positioning hole 2161, so that the positioning hole 2161 is formed at two sides of the accommodating groove 2162;

the opening width of the receiving groove 2612 is not less than the width of the rotating arm 33 arranged on the frame 30, so that the rotating arm 33 can extend into the receiving groove 2612, the positioning hole 2161 is connected with two ends of a series of positioning nodes 42 in a hooking manner and positions the position of the rotating arm 33, two ends of the series of positioning nodes 42 are also provided with connecting pieces in a penetrating manner and fixedly connected with the base 216 through the connecting pieces, specifically, the connecting pieces are bolts (not shown), the positioning hole 2161 is positioned at the opening position of the U-shaped structure and is covered with a cover plate (not shown), and the bolts sequentially penetrate through the cover plate and the end of the series of positioning nodes 42 and are fixedly connected with the bottom wall of the positioning hole 2161 of the base 216;

see fig. 2, 4;

preferably, the frame 30 is attached to the arm 33 in a cantilevered fashion on the side of the wheelset 10, the arm 33 extending obliquely upward from the end of the frame 30, the end of the arm 33 being connected to the base 216 by a series of positioning nodes 42.

Specifically, the rotating arm 33 is formed at the end of the longitudinal beam 31 of the frame 30 on the side of the wheel set 10 through a welding process or integrally formed, the other end of the rotating arm 33 extends obliquely upwards towards the direction of the wheel set 10, of course, the rotating arm 33 can also be fixedly connected with the cross beam 32 of the frame 30 through a welding process according to the design requirements, and the structure is used for enabling the frame 30 to sink below the axis of the axle 11 through a cantilever, so that the frame 30 is closer to the ground and meets the 100% low floor;

the tail end of the rotating arm 33 is provided with a mounting hole 331, that is, the top end of the rotating arm 33 is connected with a series of positioning nodes 42 through the mounting hole 331, the series of positioning nodes 42 are in interference fit with the mounting hole 331, and two ends of the series of positioning nodes 42 are detachably and fixedly connected with the base 216;

as shown in fig. 2;

the frame 30 is formed with a hollowed-out mounting area 35 in the middle for receiving a towing device 60 connecting the frame 30 and the secondary suspension 50.

Specifically, the framework 30 comprises two longitudinal beams 31 and a transverse beam 32 connected between the two longitudinal beams 31, the transverse beam 32 and the longitudinal beams 31 are sequentially connected and encircled to form an installation area 35, and a traction device 60 is installed through the installation area 35, so that the overall thickness of the bogie in the height direction (Z axis) is reduced, the space occupied by the bogie in the height direction is further compressed, and the 100% low floor is further met;

see fig. 2, 4;

the towing device 60 comprises two towing

pull rods

61a, 61b arranged at intervals, and the two towing

pull rods

61a, 61b are arranged in an X-shaped parallel crossing trend, when the vehicle is switched between self weight and load, the two towing

pull rods

61a, 61b relatively move in a scissor arm mode to change an X-shaped included angle, wherein the towing

pull rods

61a, 61b are provided with fixed ends 611 and movable ends 612, the fixed ends 611 are connected with the framework 30 through first connecting seats 321, and the movable ends 612 are connected with the swing bolster 52 of the secondary suspension 50 through second connecting seats 521.

In particular, the traction means 60 comprises two traction links, namely a first traction link 61a and a second traction link 61b,

the first traction link 61a and the second traction link 61b are projected on a plumb plane parallel to the longitudinal axis of the frame 30 to form an X-shaped cross form, and are arranged in parallel with each other on a plumb plane parallel to the transverse axis of the frame 30, when the vehicle is switched between dead weight and load, the two traction links 61 change an X-shaped included angle along the longitudinal axis of the frame 30 relative to the movement of the secondary suspension 50 in the form of a scissor arm;

wherein, one end of the traction pull rod 61 is a fixed end 611, the other end is a movable end 612, the fixed end 611 is connected with a first connecting seat 321 fixedly connected on the beam 32 of the framework 30 in a form of rotary motion through a shaft, and the movable end 612 is connected with a second connecting seat 521 fixedly connected on the swing bolster 52 in a form of rotary motion through a shaft;

the fixed end 611 of the first traction pull rod 61a is connected with the first connecting seat 321, the fixed end 611 of the second traction pull rod 61b corresponding to the first traction pull rod 61a is a movable end 612 and is connected with the second connecting seat 521 on the swing bolster 52, similarly, the movable end 612 of the first traction pull rod 61a is connected with the second connecting seat 521, the movable end 612 of the second traction pull rod 61b corresponding to the first traction pull rod 61a is a fixed end 611 and is connected with the first connecting seat 321 on the frame 30, and therefore the two traction pull rods 61 move relatively in the form of a scissor arm to change the X-shaped included angle;

see fig. 2 and 4;

the towing means 60 further comprises two telescopic

transverse dampers

62a, 62b arranged in an X-shaped parallel crossing trend for connecting between the two towing

pull rods

61a, 61b, so that the two

transverse dampers

62a, 62b follow the movement of the two towing

pull rods

61a, 62b and also move telescopically along their length axes in the form of scissor arms, wherein the two

transverse dampers

62a, 62b are projected in an X-shaped crossing pattern on a plumb plane parallel to the transverse axis of the frame 30 and are arranged parallel to each other on a plumb plane parallel to the longitudinal axis of the frame 30, the towing

pull rods

61a, 62b and the

transverse dampers

62a, 62b of the towing means 60 connect the frame 30 and the swing bolster 52 (the pivoting support bearing 53 on the upper part of the swing bolster 52 is bolted to the vehicle body, i.e. equivalent to connecting the bogie frame 30 to the vehicle body), the transverse dampers play a role of transverse damping vibration damping, and the towing

pull rods

61a, 61b and the

transverse dampers

62a, 61b are arranged uniformly between the two vertical cross beams 32 of the frame 30, and the lowest points of the towing

pull rods

61a, 61b do not go below the lower surface of the vertical cross beam 32.

Specifically, referring to fig. 4, the lateral dampers include two, i.e., a first lateral damper 62a and a second lateral damper 62b;

one end of the first transverse shock absorber 62a is rotatably connected with the first connecting seat 321 connected with the first traction pull rod 61a through a shaft, the other end of the first transverse shock absorber 62a is rotatably connected with the second connecting seat 521 connected with the second traction pull rod 61b through a shaft, and similarly, one end of the second transverse shock absorber 62b is rotatably connected with the first connecting seat 321 connected with the second traction pull rod 61b through a shaft, and the other end of the second transverse shock absorber 62b is rotatably connected with the second connecting seat 521 connected with the first traction pull rod 61a through a shaft, so that the two traction pull rods 61 are stabilized through the two transverse shock absorbers 62;

as shown in fig. 5;

a bearing surface 36 is formed on the upper surface of the framework 30, the primary suspension 40 and the secondary suspension 50 are supported through the bearing surface 36, and the lower ends of the primary suspension 40 and the secondary suspension 50 are coplanar;

wherein, the primary suspension 40 further comprises a first base fixedly connected with the bearing surface 36 of the frame 30 and a primary spring 41 arranged on the first base, the primary spring 41 is a steel spring, one end of the primary spring 41 is contacted with the first base in a propping manner, and the other end is contacted with the spring seat 215 in a propping manner;

the secondary suspension 50 comprises a second base fixedly connected with the bearing surface 36 of the framework 30, a secondary spring 51 arranged on the second base and a swing bolster 52 arranged above the secondary spring 51, one end of the secondary spring 51 is abutted against and contacted with the second base, the other end of the secondary spring is abutted against and contacted with the lower surface of the end part of the swing bolster 52, and the middle part of the swing bolster 52 is provided with a rotary support bearing 53 which is connected with the vehicle body through the rotary support bearing 53;

as shown in fig. 3;

the low-floor tramcar bogie further comprises two longitudinal driving devices 70 for driving the wheel pairs 10 to rotate, wherein the framework 30 is positioned on the running rail side and fixedly connected with the longitudinal driving devices 70 along the longitudinal axis of the framework 30, the longitudinal driving devices 70 are connected between the framework 30 and the wheel pairs 10, and two ends of a first diagonal line a of the two groups of wheel pairs 10 are connected with the longitudinal driving devices 70 so as to drive the wheel pairs 10 to rotate;

as shown in fig. 3;

in order to brake the wheel pairs 10, the low-floor tram bogie further comprises two hydraulic brake devices 80, the frame 30 is provided with the hydraulic brake devices 80 at the side away from the longitudinal driving device 70, wherein the two ends of the second diagonal line b of the two groups of wheel pairs 10 are connected with the hydraulic brake devices 80 for braking the wheels 12;

see fig. 6 and 7;

elastic wheels 12 are mounted at two ends of an axle 11 of the wheel pair 10, each wheel 12 comprises a hub 121 in interference fit with the axle 11, a rim 123 sleeved outside the hub 121, an elastic element 122 mounted between the hub 121 and the rim 123, and a pressing ring 124 for synchronously supporting the elastic element 122 with the hub 121, the hub 121 is positioned at the side of the axle box device 20 to form a C-like groove structure for accommodating the axle box device 20, so that the axle box device 20 can be embedded into the wheel 12, the span of the two axle box devices 20 on the wheel pair 10 is increased, the rotation space of a vehicle body passageway in the end region of a bogie is increased to adapt to a vehicle passing through a small curve passageway, and a vehicle body with the width of 600mm does not interfere with the bogie;

in the technical scheme, the low-floor tramcar wheel set and the bogie with the wheel set provided by the invention have the beneficial effects that:

secondly, a second side surface, far away from the wheel side, of a first connecting end of the axle box body extends towards a second connecting end from the first connecting end in an inclined mode, so that two opposite axle box devices on the axle are located on the longitudinal axis side of the framework to form a horn-shaped structure, the second connecting end is offset from the first side surface of the first connecting end to the longitudinal axis side of the framework, wheels are matched with the axle box body, a larger free rotation space is provided for a vehicle body passageway, the distance between the first connecting ends of the two axle box devices is increased to the maximum degree, a series spring is offset from the transverse center line of the axle and is close to the center of the framework, and the end part (namely a cantilever) of a longitudinal beam of the framework is arranged below the axle box body, so that the upper space of the connecting middle section of the axle box body is larger, the rotation space of the vehicle body passageway is further increased, the span width in the end part of the bogie is increased, and the rotation space of the vehicle body passageway in the end part area of the bogie is increased;

the bogie is matched with the axle box body and the primary suspension and the framework through wheels, so that when a vehicle passes through a small curve, the framework, the axle box and the primary suspension of the bogie can avoid the interference with a vehicle body passageway which rotates relative to the framework and is vertically embedded into the bogie, and the use requirements that the maximum longitudinal gradient of a passing channel in a 100% low-floor tramcar adopting the wheel pair type rotary bogie is not more than 8% and the width of the vehicle body passageway is not less than 600mm are met;

compared with the prior art, the low-floor tramcar wheel set and the bogie with the wheel set have the advantages of simple structure, high reliability and low failure rate.

While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.

Claims

1. A low-floor tram wheel-set (10) comprising:

an axle (11) and wheels (12) mounted on both ends of the axle (11);

the wheel (12) is an elastic wheel;

the hub (121) of the wheel (12) is in interference fit with the axle (11);

a rim (123) is sleeved outside the hub (121), an elastic element (122) is installed between the hub (121) and the rim (123), and a pressing ring (124) used for synchronously supporting the elastic element (122) with the hub (121) is further sleeved on the hub (121);

the hub (121) comprises a body and a web formed circumferentially outside the body;

one side of the web is formed with a C-like groove structure for receiving the axle housing arrangement (20).

2. A low-floor tram wheel pair (10) according to claim 1, characterized in that;

the web comprises a first plate body (1211) extending in the radial direction of the axle (11) and a second plate body (1212) connected to the first plate body (1211) and extending in the circumferential direction of the axle (11);

the first plate body (1211) and the second plate body (1212) form the groove structure, and the first plate body (1211) is offset from a side of a radial center axis of the rim (123) away from the axle box device (20).

3. A low-floor tram wheel pair (10) according to claim 2, characterized in that;

the included angle between the first plate body (1211) and the second plate body (1212) is not less than 90 degrees.

4. A low-floor tram wheel set (10) according to claim 1, characterized in that;

the body is provided with a first bulge part (1214) which is concave inside the groove structure at the side of the groove structure, the end part of the first bulge part (1214) is in contact with a bearing (22), the side of the body far away from the first bulge part (1214) is provided with a second bulge part (1215) which protrudes out of the web, the inner diameter of the second bulge part (1215) and the inner diameter of the first bulge part (1214) are in interference fit with the axle (11), and the outer diameter of the second bulge part (1215) is provided with a transition surface (1216) which extends obliquely upwards and is connected with the web.

5. A low-floor tram bogie, comprising:

a low-floor tram wheel-set (10) as claimed in any one of claims 1-4;

a frame (30) erected between two sets of said wheel pairs (10);

an axle box arrangement (20) connecting the wheel-sets (10) and the frame (30); and

a primary suspension (40) arranged between the axle box arrangement (20) and the frame (30);

the axle box devices (20) are arranged on the axle (11) and positioned on the inner sides of the wheels (12), and the two axle box devices (20) on each group of wheel pairs (10) are symmetrically arranged along the longitudinal axis of the framework (30);

a shaft housing (21) of the axle housing device (20) has a first connection end (211) rotatably connected to the axle (11), a second connection end (212) disposed above the frame (30), and a connection middle section (213) connected between the first connection end (211) and the second connection end (212) and connected to the frame (30);

the second connecting end (212) and the upper surface of the framework (30) form the primary suspension (40);

one side of the axle box body (21) is arranged in an intruding manner in the groove structure, and the other side of the axle box body (21) extends from the first connecting end (211) towards the second connecting end (212) in an inclined manner, so that two opposite axle box devices (20) on the axle (11) are positioned on the longitudinal axis side of a framework (30) to form a flared structure.

6. A low-floor tram bogie as claimed in claim 5, characterised in that;

the first connecting end (211) is provided with a first side surface (2111) at the side of the wheel (12) and a second side surface (2112) at the side far away from the wheel (12);

said first side (2111) being placed inside said wheel (12) in an invasive manner;

the second side (2112) extends obliquely from the first connection end (211) towards the second connection end (212);

the second connection end (212) is offset to the longitudinal axis side of the frame (30) with respect to the first side face (2111) and extends toward the lateral axis direction of the frame (30) so as to be away from the axle (11).

7. A low-floor tram bogie as claimed in claim 5, characterised in that;

the primary suspension (40) has a series of springs (41) with axes parallel to the vertical axis of the frame (30), supported vertically by the series of springs (41) between the frame (30) and the second connection end (212) of the axle box (21).

8. A low-floor tram bogie as claimed in claim 5, characterised in that;

a base (216) is arranged at the lower part of the connecting middle section (213), and the base (216) is connected with the framework (30) through a positioning structure;

the frame (30) is located the wheel pair (10) side and is linked firmly rocking arm (33) with the form of cantilever, rocking arm (33) from frame (30) end upwards extends aslope, rocking arm (33) end through a series of location node (42) with base (216) are connected.

9. A low-floor tram bogie as claimed in claim 5, characterised in that;

the middle part of the framework (30) is provided with a mounting area (35) with a hollow structure so as to be used for accommodating a traction device (60) for connecting the framework (30) and the secondary suspension (50).

10. A low-floor tram bogie as claimed in claim 5, characterised in that;

the upper surface of the framework (30) is provided with a bearing surface (36), the primary suspension (40) and the secondary suspension (50) are supported through the bearing surface (36), and the lower ends of the primary suspension (40) and the secondary suspension (50) are coplanar.