阅读说明：本技术 一种低地板有轨电车动车端梁及下部铰接安装座结构 (End beam and lower part hinged mounting base structure of low-floor tramcar motor car ) 是由 杨坤 刘琳峰 毕海涛 王晶晶 黄鹏 陈晨 于 2019-10-25 设计创作，主要内容包括：本发明公开了一种低地板有轨电车动车端梁及下部铰接安装座结构,包括端梁和设置在端梁后端中心的铰接安装座,所述端梁呈凹面中空结构,内部设置有加强筋布,所述端梁上位于铰接安装座的左右两侧各设置有一个车间减震安装座,两个车间减震安装座以所述铰接安装座为中心左右对称,所述车间减震安装座与铰接安装座之间设置有旋转止档,位于铰接安装座左右两侧的两个旋转止档以所述铰接安装座为中心左右对称。这种低地板有轨电车动车端梁及下部铰接安装座结构保证了结构的轻量化设计,结构简单,强度性能好,制作方便,成本低,维护方便,独特的端梁、铰接安装座以及旋转止档和车间减震安装座的布置形式,满足了车辆运行稳定性和舒适性要求。(The invention discloses a low-floor tramcar end beam and lower part hinged mounting seat structure, which comprises an end beam and a hinged mounting seat arranged in the center of the rear end of the end beam, wherein the end beam is of a concave hollow structure, reinforcing rib cloth is arranged in the end beam, a workshop damping mounting seat is respectively arranged on the left side and the right side of the hinged mounting seat on the end beam, the two workshop damping mounting seats are bilaterally symmetrical by taking the hinged mounting seat as the center, a rotation stop is arranged between the workshop damping mounting seat and the hinged mounting seat, and the two rotation stop positioned on the left side and the right side of the hinged mounting seat are bilaterally symmetrical by taking the hinged mounting seat as the center. The end beam and lower part hinged mounting seat structure of the low-floor tramcar motor car ensures the lightweight design of the structure, has simple structure, good strength performance, convenient manufacture, low cost and convenient maintenance, and meets the requirements of vehicle running stability and comfort due to the arrangement form of the unique end beam, hinged mounting seat, rotary stop and workshop damping mounting seat.)

1. The utility model provides a low-floor tram motor car end beam and articulated mount pad structure of lower part, includes end beam (1) and sets up at the articulated mount pad (2) at end beam (1) rear end center, its characterized in that: the damping device is characterized in that a workshop damping mounting seat (4) is respectively arranged on the left side and the right side of the hinged mounting seat (2) on the end beam (1), the two workshop damping mounting seats (4) are bilaterally symmetrical by taking the hinged mounting seat (2) as a center, a rotation stop (3) is arranged between the workshop damping mounting seat (4) and the hinged mounting seat (2), and the two rotation stop (3) on the left side and the right side of the hinged mounting seat (2) are bilaterally symmetrical by taking the hinged mounting seat (2) as a center; the end beam (1) is composed of an upper cover plate (11), a lower cover plate (12), a front vertical plate (13) and a rear vertical plate (14), the front vertical plate (13) and the rear vertical plate (14) are vertically arranged in parallel, the upper cover plate (11) is fixedly welded to the tops of the front vertical plate (13) and the rear vertical plate (14), the lower cover plate (12) is fixedly welded to the bottoms of the front vertical plate (13) and the rear vertical plate (14), and the hinged mounting seat (2), the rotary stop (3) and the workshop damping mounting seat (4) are fixedly arranged on the rear vertical plate (14); the upper cover plate (11), the lower cover plate (12), the front vertical plate (13) and the rear vertical plate (14) which are connected with each other form an end beam (1) which is hollow inside, two groups of reinforcing units are symmetrically arranged inside the hollow of the end beam (1) by taking the center line of the left and right intervals of the end beam as the center, each group of reinforcing units consists of a first reinforcing rib (6) which is vertically arranged, a second reinforcing rib (7) which is vertically arranged and a third reinforcing rib (8) which is vertically arranged, and the first reinforcing rib (6), the second reinforcing rib (7) and the third reinforcing rib (8) in each group of reinforcing units are sequentially and transversely arranged from inside to outside; the hinge mounting seat (2) consists of a front hinge mounting plate (21), a trapezoidal upper cover plate (22), a trapezoidal lower cover plate (23) and two side plates (24); the front hinged mounting plate (21) is vertically parallel to the rear vertical plate (14), the outer contour surfaces of the trapezoidal upper cover plate (22) and the trapezoidal lower cover plate (23) are the same, the trapezoidal upper cover plate (22) and the trapezoidal lower cover plate (23) are transversely welded to the upper end and the lower end of the front hinged mounting plate (21) in parallel, the length of the front hinged mounting plate (21) is the same as that of the upper bottom of the trapezoidal upper cover plate (22) and the trapezoidal lower cover plate (23), the lower bottoms of the trapezoidal upper cover plate (22) and the trapezoidal lower cover plate (23) are fixedly welded to the rear vertical plate (14), the two side plates (24) are symmetrically welded to the left end and the right end of the trapezoidal upper cover plate (22) and the trapezoidal lower cover plate (23), the front ends of the side plates (24) are fixedly welded to the end of the front hinged mounting plate (21), the rear ends of the trapezoidal upper cover plate (22) are fixedly welded to the rear vertical plate (14), and the trapezoidal mounting seat (2) formed by the front hinged mounting plate (21), the trapezoidal And (4) is empty.

2. The low-floor tramcar end beam and lower hinge mount structure of claim 1 wherein: the height of the front vertical plate (13) is higher than that of the rear vertical plate (14), and the front end of an upper cover plate (11) fixedly welded at the tops of the front vertical plate (13) and the rear vertical plate (14) is tilted upwards; the front end face of the front vertical plate (13) is of a concave structure, and the contour line of the front end of the lower cover plate (12) is the same as the contour line of the bottom of the front vertical plate (13) and is fixedly welded together; the left side and the right side of the concave structure on the front vertical plate (13) form a concave inclined plate (131) which is inclined outwards and is symmetrical left and right, the included angle between the concave inclined plate (131) and the front end face of the front vertical plate (13) is 56 degrees, and two second reinforcing ribs (7) which are symmetrical left and right in the end beam (1) are respectively parallel to the two concave inclined plates (131) which are symmetrical left and right.

3. The low-floor tramcar end beam and lower hinge mount structure of claim 1 wherein: the hinge mounting seat is characterized in that two vertical reinforcing ribs (25) which are vertically and symmetrically arranged are arranged in the trapezoidal hollow cavity of the hinge mounting seat (2), and a transverse reinforcing rib (26) which is parallel to the trapezoidal upper cover plate (22) and the trapezoidal lower cover plate (23) and is connected with the hinge mounting seat (2) at the end part is arranged between the two vertical reinforcing ribs (25).

4. The low-floor tramcar end beam and lower hinge mount structure of claim 1 wherein: the left and right lengths of the upper cover plate (11), the front vertical plate (13) and the rear vertical plate (14) are the same, and the left and right lengths of the lower cover plate (12) are shorter than those of the upper cover plate (11) which is parallel to the lower cover plate; four flat plate reinforcing ribs (5) which are longitudinally and uniformly distributed are respectively arranged at the positions, close to the left end and the right end, of the bottom of the upper cover plate (11), and the flat plate reinforcing ribs (5) at the two ends are mutually symmetrical; the thickness of every dull and stereotyped strengthening rib (5) is 8mm, and dull and stereotyped strengthening rib (5) interval of every end equipartition of upper cover plate (11) is 65mm, both ends are corresponding bottom dull and stereotyped strengthening rib (5) at both ends about lower apron (12) and upper cover plate (11) bottom.

5. The low-floor tramcar end beam and lower hinge mount structure of claim 1 wherein: the first reinforcing rib (6) and the third reinforcing rib (8) are parallel to the tramcar body; the distance between the two first reinforcing ribs (6) in bilateral symmetry is 654mm, the thickness of the first reinforcing ribs (6) is 6mm, the distance between the two third reinforcing ribs (8) in bilateral symmetry is 1733mm, and the thickness of the third reinforcing ribs (8) is 5 mm.

6. The low-floor tramcar end beam and lower hinge mount structure of claim 1 wherein: lightening holes are formed in the middle parts of the first reinforcing rib (6), the second reinforcing rib (7) and the third reinforcing rib (8), wherein the lightening holes in the first reinforcing rib (6) and the second reinforcing rib (7) are both rectangular lightening holes, and the lightening hole in the third reinforcing rib (8) consists of a rectangular lightening hole and a trapezoidal lightening hole; the length and width of the rectangular lightening holes on the first reinforcing ribs (6) are 154mm x 54mm, the length and width of the rectangular lightening holes on the second reinforcing ribs (7) are 165mm x 70mm, the length of the rectangular lightening holes on the third reinforcing ribs (8) are 180mm x 45mm, the length of the upper bottoms of the trapezoidal lightening holes is 50mm, the length of the lower bottoms of the trapezoidal lightening holes is 100mm, and the height of the trapezoidal lightening holes is 194 mm.

7. The low-floor tramcar end beam and lower hinge mount structure of claim 1 wherein: two triangular lightening holes (221) with the same structure and size are formed in the trapezoidal upper cover plate (22) and the trapezoidal lower cover plate (23), a rectangular lightening hole (222) is further formed between the two triangular lightening holes (221) in the trapezoidal upper cover plate (22), the length and the width of the rectangular lightening hole (222) are 240mm x 100mm, the triangular lightening hole (221) is of a right-angled triangular structure, and the length of two right-angled sides of the triangular lightening hole is 70mm x 90 mm.

8. The low-floor tramcar end beam and lower hinge mount structure of claim 1 wherein: the thickness of trapezoidal upper cover plate (22) is 15mm, and the thickness of trapezoidal lower cover plate (23) is 10mm, and the thickness of preceding articulated mounting panel (21) is 15mm, and curb plate (24) thickness is 8mm, trapezoidal upper cover plate (22) and trapezoidal lower cover plate (23) are isosceles trapezoid, and its base angle is 60.

9. The low-floor tramcar end beam and lower hinge mount structure of claim 1 wherein: rotatory backstop (3) are hollow structure's rectangle side pipe, and its terminal surface length and width size is 60mm, and the wall thickness is 4mm, and length is 270mm around, rotatory backstop (3) are welded on end beam (1) admittedly, and its distance apart from the center about end beam (1) is 335 mm.

10. The low-floor tramcar end beam and lower hinge mount structure of claim 1 wherein: the workshop damping mounting seat (4) is of a boss structure and is composed of a rectangular substrate and two bosses which are arranged on the rectangular substrate in parallel up and down, the rectangular substrate is riveted on the end beam (1), the length and width of the end face of the rectangular substrate are 110mm x 130mm, the thickness of the rectangular substrate is 6mm, and the length, width and height of each boss are 34 mm.

Technical Field

The invention relates to the field of low-floor tramcars, in particular to a motor car end beam and lower hinged mounting seat structure of a low-floor tramcar.

Background

In order to meet the requirement of passing through a small-radius curve, modern low-floor tramcars adopt the design scheme of short car body modules, and the modules are connected through a hinge mechanism. The end beam and the hinged mounting seat are required to bear longitudinal force, transverse force, vertical force and corresponding torsional load generated in the running process of the vehicle, and the forces are transmitted to another section of vehicle through the hinged mechanism. Meanwhile, the vehicle can smoothly and quickly pass through a small-radius curve by restraining and releasing the degree of freedom among vehicle modules, and the smooth and stable running of the vehicle is ensured, so that the end beam and the hinged mounting seat are key parts of the low-floor tramcar.

However, in the existing low-floor tramcar, the mounting seat and the end beam for mounting the hinge mechanism bear the complex dynamic load of the hinge mechanism, the hinge mechanism is stressed greatly, and no buffering energy absorption device is arranged, so that the load is directly transmitted to the mounting seat and the end beam of the hinge mechanism, and the mounting seat and the end beam of the hinge mechanism are stressed greatly. If the installation seat and the end beam are not designed reasonably, the potential safety hazard that the end part of the vehicle body and the hinged seat are cracked until being damaged can be caused. Therefore, the strong bearing capacity of the mounting seat and the end beam is a condition which needs to be met.

In the running process of the vehicle, the axle weight of the vehicle is strictly required, so that under the condition of meeting the strength of the vehicle body, the end beam and the hinged mounting seat are required to be designed in a light weight mode, and meanwhile, the structure of the vehicle is required to be simple, the vehicle is convenient to manufacture, and the cost requirement is met.

Disclosure of Invention

The invention aims to solve the technical problem of providing a low-floor tramcar end beam and lower hinged mounting seat structure which can meet various load requirements generated when a low-floor tramcar runs, meets hinged connection, is light in weight design, simple in structure and convenient to manufacture.

In order to solve the technical problems, the invention is realized by the following technical scheme: a low-floor tramcar end beam and lower part hinged mounting seat structure comprises an end beam and a hinged mounting seat arranged in the center of the rear end of the end beam, wherein a workshop damping mounting seat is respectively arranged on the left side and the right side of the hinged mounting seat on the end beam, the two workshop damping mounting seats are bilaterally symmetrical by taking the hinged mounting seat as the center, a rotary stop is arranged between the workshop damping mounting seat and the hinged mounting seat, and the two rotary stop positioned on the left side and the right side of the hinged mounting seat are bilaterally symmetrical by taking the hinged mounting seat as the center; the end beam consists of an upper cover plate, a lower cover plate, a front vertical plate and a rear vertical plate, the front vertical plate and the rear vertical plate are vertically arranged in parallel, the upper cover plate is fixedly welded at the tops of the front vertical plate and the rear vertical plate, the lower cover plate is fixedly welded at the bottoms of the front vertical plate and the rear vertical plate, and the hinged mounting seat, the rotary stop and the workshop damping mounting seat are fixedly arranged on the rear vertical plate; the upper cover plate, the lower cover plate, the front vertical plate and the rear vertical plate which are connected with each other form an end beam which is hollow inside, two groups of reinforcing units are symmetrically arranged inside the hollow part of the end beam by taking the center line of the left and right intervals of the end beam as the center, each group of reinforcing units consists of a first reinforcing rib which is vertically arranged, a second reinforcing rib which is vertically arranged and a third reinforcing rib which is vertically arranged, and the first reinforcing rib, the second reinforcing rib and the third reinforcing rib in each group of reinforcing units are sequentially and transversely arranged from inside to outside; the hinge mounting seat consists of a front hinge mounting plate, a trapezoidal upper cover plate, a trapezoidal lower cover plate and two side plates; the front hinged mounting plate is vertically parallel to the rear vertical plate, the outer contour surfaces of the trapezoidal upper cover plate and the trapezoidal lower cover plate are the same, the trapezoidal upper cover plate and the trapezoidal lower cover plate are transversely welded at the upper end and the lower end of the front hinged mounting plate in parallel, the length of the front hinged mounting plate is the same as that of the upper bottom of the trapezoidal upper cover plate and the upper bottom of the trapezoidal lower cover plate, the lower bottoms of the trapezoidal upper cover plate and the trapezoidal lower cover plate are fixedly welded with the rear vertical plate, the two side plates are symmetrically welded at the left end and the right end of the trapezoidal upper cover plate and the left end and the right end of the trapezoidal lower cover plate, the front ends of the side plates are fixedly welded with the end portion of the front hinged mounting plate, the rear ends are fixedly welded with the rear vertical plate.

Preferably, the height of the front vertical plate is higher than that of the rear vertical plate, and the front end of an upper cover plate fixedly welded on the tops of the front vertical plate and the rear vertical plate is tilted upwards; the front end face of the front vertical plate is of a concave structure, and the contour line of the front end of the lower cover plate is the same as the bottom contour line of the front vertical plate and fixedly welded together; the left side and the right side of the concave structure on the front vertical plate form a concave inclined plate which is inclined outwards and is bilaterally symmetrical, the included angle between the concave inclined plate and the front end face of the front vertical plate is 56 degrees, and the two second reinforcing ribs which are bilaterally symmetrical in the end beam are respectively parallel to the two concave inclined plates which are bilaterally symmetrical.

Preferably, two vertical reinforcing ribs which are symmetrically arranged in the vertical direction are arranged in the trapezoidal hollow cavity of the hinged mounting seat, and a transverse reinforcing rib which is parallel to the trapezoidal upper cover plate and the trapezoidal lower cover plate and the end part of which is connected with the hinged mounting seat is arranged between the two vertical reinforcing ribs.

Preferably, the left and right lengths of the upper cover plate, the front vertical plate and the rear vertical plate are the same, and the left and right lengths of the lower cover plate are shorter than those of the upper cover plate parallel to the lower cover plate; the bottom of the upper cover plate is provided with four flat plate reinforcing ribs which are longitudinally and uniformly distributed at positions close to the left end and the right end of the upper cover plate, and the flat plate reinforcing ribs at the two ends are mutually symmetrical; the thickness of every dull and stereotyped strengthening rib is 8mm, and the dull and stereotyped strengthening rib interval of every end equipartition of upper cover plate is 65mm, both ends are corresponding with the dull and stereotyped strengthening rib bottom at both ends about the upper cover plate bottom about the lower cover plate.

Preferably, the first and third reinforcing beads are parallel to the tram body; the distance between the two first reinforcing ribs in bilateral symmetry is 654mm, the thickness of the first reinforcing ribs is 6mm, the distance between the two third reinforcing ribs in bilateral symmetry is 1733mm, and the thickness of the third reinforcing ribs is 5 mm.

Preferably, lightening holes are formed in the middle parts of the first reinforcing rib, the second reinforcing rib and the third reinforcing rib, wherein the lightening holes in the first reinforcing rib and the second reinforcing rib are rectangular lightening holes, and the lightening hole in the third reinforcing rib consists of a rectangular lightening hole and a trapezoidal lightening hole; the length and width of the rectangular lightening holes in the first reinforcing ribs are 154mm x 54mm, the length and width of the rectangular lightening holes in the second reinforcing ribs are 165mm x 70mm, the length of the rectangular lightening holes in the third reinforcing ribs is 180mm x 45mm, the length of the upper bottom of each trapezoidal lightening hole is 50mm, the length of the lower bottom of each trapezoidal lightening hole is 100mm, and the height of each trapezoidal lightening hole is 194 mm.

Preferably, two triangular lightening holes with the same structure and size are arranged on the trapezoidal upper cover plate and the trapezoidal lower cover plate, wherein a rectangular lightening hole is further arranged between the two triangular lightening holes on the trapezoidal upper cover plate, the length and width of the rectangular lightening hole is 240mm x 100mm, the triangular lightening hole is in a right-angled triangular structure, and the length of two right-angled sides of the triangular lightening hole is 70mm x 90 mm.

Preferably, the thickness of the trapezoidal upper cover plate is 15mm, the thickness of the trapezoidal lower cover plate is 10mm, the thickness of the front hinge mounting plate is 15mm, the thickness of the side plate is 8mm, the trapezoidal upper cover plate and the trapezoidal lower cover plate are both isosceles trapezoids, and the base angles of the trapezoidal upper cover plate and the trapezoidal lower cover plate are both 60 degrees.

Preferably, the rotation stopper is a rectangular square tube with a hollow structure, the length and width of the end face of the square tube are 60mm x 60mm, the thickness of the tube wall is 4mm, the front length and the rear length are 270mm, the rotation stopper is fixedly welded on the end beam, and the distance between the rotation stopper and the left center and the right center of the end beam is 335 mm.

Preferably, the workshop damping mounting base is of a boss structure and is composed of a rectangular base and two bosses which are arranged on the rectangular base in parallel up and down, the rectangular base is riveted on the end beam, the length and width of the end face of the rectangular base are 110mm x 130mm, the thickness of the rectangular base is 6mm, and the length, width and height of each boss are 34 mm.

Compared with the prior art, the invention has the advantages that: the end beam and the lower hinged mounting base structure of the low-floor tramcar are arranged through the unique concave hollow structure end beam and the internal reinforcing ribs, so that the structure is simple, the strength performance is good, the manufacture is convenient, and the cost is low; the unique lightening holes ensure the lightweight design of the structure; the hinged mounting seat is of a trapezoidal hollow structure, is stressed reasonably, has the same shape as the transmission path of the load, obviously enhances the structural strength of the mounting seat, has simple and reasonable structure and convenient maintenance, and is provided with a plurality of lightening holes on the premise of meeting the bearing capacity through the optimized design of the structure; the unique arrangement forms of the end beam, the hinged mounting seat, the rotary stop and the workshop damping mounting seat meet the requirements of vehicle running stability and comfort.

Drawings

FIG. 1 is a schematic view of the external structure of the end beam and lower hinge mount structure of a low-floor tramcar according to the present invention;

FIG. 2 is a schematic view of the bottom structure of the end beam and lower hinged mounting base structure of a low-floor tramcar of the present invention;

FIG. 3 is a schematic side view of a low floor tramcar end beam and lower hinge mount structure of the present invention;

fig. 4 is a schematic view of the internal structure of the end beam and the lower hinged mounting base structure of the low-floor tramcar.

In the figure: 1. an end beam; 11. an upper cover plate; 12. a lower cover plate; 13. a front vertical plate; 131. a concave sloping plate; 14. a rear vertical plate; 2. a hinged mounting seat; 21. a front hinged mounting plate; 22. a trapezoidal upper cover plate; 221. triangular lightening holes; 222. rectangular lightening holes; 23. a trapezoidal lower cover plate; 24. a side plate; 25. longitudinal reinforcing ribs; 26. transverse reinforcing ribs; 3. stopping rotation; 4. a workshop damping mounting seat; 5. a planar plate stiffener; 6. a first reinforcing rib; 7. a second reinforcing rib; 8. and a third reinforcing rib.

Detailed Description

The invention is described in detail below with reference to the figures and the detailed description.

Fig. 1 to 4 show a low floor tramcar end beam and lower portion hinge mount structure, which includes an end beam 1 and a hinge mount 2 disposed at the center of the rear end of the end beam 1, in order to meet the normal operation requirement of the vehicle and maintain the requirement of the vehicle operation stability and comfort, a workshop shock mount 4 is disposed on each of the left and right sides of the hinge mount 2 on the end beam 1, two workshop shock mounts 4 are bilaterally symmetrical with the hinge mount 2 as the center, a rotation stop 3 is disposed between the workshop shock mount 4 and the hinge mount 2, and two rotation stops 3 disposed on each of the left and right sides of the hinge mount 2 are bilaterally symmetrical with the hinge mount 2 as the center; the end beam 1 consists of an upper cover plate 11, a lower cover plate 12, a front vertical plate 13 and a rear vertical plate 14, the front vertical plate 13 and the rear vertical plate 14 are vertically arranged in parallel, the upper cover plate 11 is fixedly welded at the tops of the front vertical plate 13 and the rear vertical plate 14, the lower cover plate 12 is fixedly welded at the bottoms of the front vertical plate 13 and the rear vertical plate 14, the left and right lengths of the upper cover plate 11, the front vertical plate 13 and the rear vertical plate 14 are the same, the left and right lengths of the lower cover plate 12 are shorter than that of the upper cover plate 11 parallel to the lower cover plate 12, the height of the front vertical plate 13 is higher than that of the rear vertical plate 14, the front end of the upper cover plate 11 fixedly welded at the tops of the front vertical plate 13 and the rear vertical plate 14 is tilted upwards, and the hinged mounting seat 2, the rotary; the upper cover plate 11, the lower cover plate 12, the front vertical plate 13 and the rear vertical plate 14 which are mutually connected form an end beam 1 with a hollow interior, two groups of reinforcing units are symmetrically arranged in the hollow interior of the end beam 1 by taking the center line of the left-right distance of the end beam as a center, each group of reinforcing units consists of a first reinforcing rib 6 which is vertically arranged, a second reinforcing rib 7 which is vertically arranged and a third reinforcing rib 8 which is vertically arranged, and the first reinforcing rib 6, the second reinforcing rib 7 and the third reinforcing rib 8 in each group of reinforcing units are sequentially and transversely arranged from inside to outside; the hinged mounting base 2 consists of a front hinged mounting plate 21, a trapezoidal upper cover plate 22, a trapezoidal lower cover plate 23 and two side plates 24; the front hinged mounting plate 21 is vertically parallel to the rear vertical plate 14, the outer contour surfaces of the trapezoidal upper cover plate 22 and the trapezoidal lower cover plate 23 are the same, the trapezoidal upper cover plate 22 and the trapezoidal lower cover plate 23 are transversely welded at the upper end and the lower end of the front hinged mounting plate 21 in parallel, the length of the front hinged mounting plate 21 is the same as that of the upper bottom of the trapezoidal upper cover plate 22 and the trapezoidal lower cover plate 23, the lower bottoms of the trapezoidal upper cover plate 22 and the trapezoidal lower cover plate 23 are fixedly welded with the rear vertical plate 14, the two side plates 24 are symmetrically welded at the left end and the right end of the trapezoidal upper cover plate 22 and the trapezoidal lower cover plate 23, the front ends of the side plates 24 are fixedly welded with the end part of the front hinged mounting plate 21, the rear ends are fixedly welded with the rear vertical plate 14, a trapezoidal hollow is formed inside the hinged mounting base 2 composed of the front hinged mounting plate 21, the trapezoidal upper cover plate 22, the trapezoidal lower cover plate 23 and, a transverse reinforcing rib 26 which is parallel to the trapezoidal upper cover plate 22 and the trapezoidal lower cover plate 23 and the end part of which is connected with the hinged mounting seat 2 is arranged between the two longitudinal reinforcing ribs 25. Trapezoidal hollow structure's articulated mount pad 2 is the whole welding, and the atress is reasonable, and trapezoidal waist structure and inside vertical strengthening rib 25 and the design of horizontal strengthening rib 26 that whole both sides board 24 is constituteed simultaneously are unanimous with load transmission direction, make articulated mount pad 2 obviously strengthen, and simple structure is reasonable, low in manufacturing cost, and it is convenient to maintain.

In order to enable the vehicle running load transmitted by the hinged mounting seat 2 to be uniformly dispersed and transmitted to main stressed components of the end beam as much as possible, and simultaneously to meet the light weight requirement of the end beam of the vehicle body and ensure the strength and rigidity requirements of the end beam 1 around the hinged mounting seat 2, the front end surface of the front vertical plate 13 is of a concave structure, and the contour line of the front end of the lower cover plate 12 is identical to the bottom contour line of the front vertical plate 13 and is fixedly welded together; the left side and the right side of the concave structure on the front vertical plate 13 form a concave inclined plate 131 which is inclined outwards and is bilaterally symmetrical, the included angle between the concave inclined plate 131 and the front end face of the front vertical plate 13 is 56 degrees, and the two second reinforcing ribs 7 which are bilaterally symmetrical in the end beam 1 are respectively parallel to the two concave inclined plates 131 which are bilaterally symmetrical.

In order to meet the requirements on the strength and the rigidity of the vehicle body under the working condition of vehicle body erection while the integral vehicle body erection is met, four flat plate reinforcing ribs 5 which are longitudinally and uniformly distributed are respectively arranged at the positions, close to the left end and the right end, of the bottom of the upper cover plate 11, and the flat plate reinforcing ribs 5 at the two ends are mutually symmetrical; the thickness of every dull and stereotyped strengthening rib 5 is 8mm, and the 5 intervals of dull and stereotyped strengthening rib of 11 every end equipartitions of upper cover plate are 65mm, both ends and the dull and stereotyped strengthening rib 5 bottoms at both ends about 11 bottoms of upper cover plate are corresponding about lower apron 12.

The requirements of the strength and the rigidity of the end beam around the hinged installation seat are met, the first reinforcing rib 6 and the third reinforcing rib 8 are parallel to the body of the tramcar, the distance between the two first reinforcing ribs 6 which are symmetrical left and right is 654mm, and the thickness of the first reinforcing rib 6 is 6 mm; in order to meet the requirements of strength and rigidity of two sides of the end beam 1, the distance between the two third reinforcing ribs 8 which are symmetrical left and right is 1733mm, and the thickness of each third reinforcing rib 8 is 5 mm.

In order to reduce the dead weight of the end beam 1 and meet the use strength requirement of the reinforcing ribs to the maximum extent, weight reducing holes are formed in the middle parts of the first reinforcing rib 6, the second reinforcing rib 7 and the third reinforcing rib 8, wherein the weight reducing holes in the first reinforcing rib 6 and the second reinforcing rib 7 are both rectangular weight reducing holes, and the weight reducing hole in the third reinforcing rib 8 consists of one rectangular weight reducing hole and one trapezoidal weight reducing hole; the length and width of the rectangular lightening holes on the first reinforcing ribs 6 are 154mm × 54mm, the length and width of the rectangular lightening holes on the second reinforcing ribs 7 are 165mm × 70mm, the length of the rectangular lightening holes on the third reinforcing ribs 8 are 180mm × 45mm, the length of the upper bottoms of the trapezoidal lightening holes is 50mm, the length of the lower bottoms of the trapezoidal lightening holes is 100mm, and the height of the trapezoidal lightening holes is 194 mm.

In order to meet the bearing capacity of the hinged mounting seat 2, and simultaneously reduce the weight of the whole structure and meet the requirement of light weight of the product, two triangular lightening holes 221 with the same structure and size are respectively arranged on the trapezoidal upper cover plate 22 and the trapezoidal lower cover plate 23, wherein a rectangular lightening hole 222 is also arranged between the two triangular lightening holes 221 on the trapezoidal upper cover plate 22, the length and width of the rectangular lightening hole 222 are 240mm x 100mm, the triangular lightening hole 221 is in a right-angled triangular structure, and the lengths of two right-angled sides of the triangular lightening hole 221 are 70mm x 90 mm.

In order to meet the transmission of various loads in the running process of a vehicle, the thickness of the trapezoidal upper cover plate 22 is 15mm, the thickness of the trapezoidal lower cover plate 23 is 10mm, the thickness of the front hinge mounting plate 21 is 15mm, the thickness of the side plate 24 is 8mm, the trapezoidal upper cover plate 22 and the trapezoidal lower cover plate 23 are both isosceles trapezoids, and the base angles of the isosceles trapezoids are 60 degrees.

In order to meet the normal operation requirement of a vehicle and the requirement of the operation stability of the vehicle, the structure of the rotary stop 3-gear seat is simple, the manufacture is convenient, and the requirements of strength, rigidity and light weight during the operation of the vehicle are met, the rotary stop 3 is a rectangular square tube with a hollow structure, the length and the width of the end surface of the square tube are 60mm x 60mm, the thickness of the tube wall is 4mm, the front length and the rear length of the square tube are 270mm, the rotary stop 3 is fixedly welded on the end beam 1, and the distance from the left center and the right center of the end beam 1 is 335 mm.

In order to ensure that the workshop damping mounting seat 4 is simple in structure and convenient to manufacture and meets the requirements of strength, rigidity and light weight during vehicle operation, the workshop damping mounting seat 4 is of a boss structure and comprises a rectangular base and two bosses which are arranged on the rectangular base in parallel up and down, the rectangular base is riveted on an end beam 1, the length and width of the end face of the rectangular base are 110mm plus 130mm, the thickness of the rectangular base is 6mm, and the length, width and height of each boss are 34 mm.

The end beam and the lower hinged mounting base structure of the low-floor tramcar are arranged through the unique concave hollow structure end beam 1 and the internal reinforcing ribs, so that the structure is simple, the strength performance is good, the manufacture is convenient, and the cost is low; the unique lightening holes ensure the lightweight design of the structure; the hinged mounting seat 2 is of a trapezoidal hollow structure, is reasonable in stress, is consistent in the whole shape with the load transfer path, is used for enhancing the structural strength of the mounting seat in detail, is simple and reasonable in structure and convenient to maintain, and is provided with a plurality of lightening holes on the premise of meeting the bearing capacity through the optimized design of the structure; the unique arrangement forms of the end beam 1, the hinged installation seat 2, the rotary stop 3 and the workshop damping installation seat 4 meet the requirements of vehicle running stability and comfort.

It is to be emphasized that: the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.