A split axle bridge for an independent wheel set

Abstract

The present invention relates to the technical field of rail transit fittings, and particularly to a split axle bridge for an independent wheel set, which includes an axle body, axle heads, short axles and short axle fixing covers. The split axle bridge for an independent wheel set of the present invention is composed of an axle body, axle heads, short axles and short axle fixing covers. The axle body and the short axles are respectively connected to the axle heads, and the modular assembly design of the axle bridge product is realized through the assembled structure, reducing the manufacturing cost of repeated mold opening of the axle bridge product, and at the same time shortening the production cycle of the product; for the axle bridge with modular assembly design, only ordinary machine tool equipment is needed to perform primary processing, semi-finishing and other processes on the components in the split state of the components, and the final finishing is carried out through special machine tool equipment after assembly, reducing the production and manufacturing cost; at the same time, lightweight materials such as cast steel or aluminum alloy can be used for the components with smaller bearing loads to achieve product lightweight.

Description

Technical Field

[0001] The present invention relates to the technical field of rail transit fittings, and in particular to a split axle bridge for an independent wheel set. Background Art

[0002] With the rapid development of urban rail transit, urban rail vehicles such as subways and light rails are used more and more widely. In particular, low-floor trams are widely welcomed due to their low cost. In order to lower the floor surface of the vehicle to about 350 mm, the new modern low-floor tram changes the traditional straight axle to a concave-structured bent axle, making the floor surface of the vehicle closer to the ground and ensuring the convenience and comfort of passengers.

[0003] The axle bridge product includes parts such as an axle body, an axle head, and a short axle, and adopts structures such as integral forging and integral casting. The overall quality is relatively large, and due to the differences in the design platforms of low-floor trams of each main engine enterprise, the dimensions of the axle bridge are different, and the requirements for processing accuracy are very high. Each axle bridge product needs to re-manufacture the mold according to its structural dimensions, with poor applicability, high product manufacturing cost, and long production cycle. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: In order to solve the problems in the above background art, an improved split axle bridge for an independent wheel set is provided to solve the problems in the above background art.

[0005] The technical solution adopted by the present invention to solve its technical problems is: A split axle bridge for an independent wheel set, including an axle body, an axle head, a short axle, and a short axle fixing cover. The cross-section of the axle body is a square or I-shaped structure. On both sides of the upper surface of the axle body, first limiting steps are symmetrically provided. Inside the first limiting steps, axle body bolt fastening interfaces with built-in bottom bolts are provided. The axle body is fixedly connected to the axle head by screwing the bottom bolts into the internal threaded holes at the lower end of the axle head. On the side wall of the axle head, an installation interface with a second limiting step and a third limiting step on the side is provided. The short axle is fixed in the installation interface through the short axle fixing cover. On the outer side surface of the short axle, a fourth limiting step protruding outward is provided corresponding to the position of the third limiting step.

[0006] The short axle and the axle head are press-fitted with interference.

[0007] Different materials can be used for the necks of the axle body, the axle head, and the short axle. Among them, the axle body can adopt relevant lightweight materials, and the neck of the short axle can adopt alloy steel materials with better material properties.

[0008] On the inner threaded hole setting surface at the lower end of the axle head, a fifth limiting step is provided. The axle head is connected to the axle body by being stuck outside the first limiting step through the fifth limiting step.

[0009] An internal turning groove communicating with the internal screw hole and the fourth limiting step is formed inside the shaft head. A turning and pressing support is movably assembled in the internal turning groove, and an inner compensation pressing plate is movably assembled on the side wall of the turning and pressing support on the assembly surface of the fourth limiting step.

[0010] The upper surface of the turning and pressing support has a laterally limiting plate protruding upward, and a plurality of adjusting and limiting card slots are formed on the side wall at the lower end of the short shaft.

[0011] The assembly surface of the inner compensation pressing plate adjacent to the first limiting step has an internal limiting rib, and lateral limiting positioning slots matched with the internal limiting rib are formed on the outer walls on both sides of the first limiting step.

[0012] The inner compensation pressing plate has an integrally structured assembly support protruding toward the internal turning groove on the surface adjacent to the turning and pressing support. The outer side surface of the turning and pressing support has an integrally structured assembly frame. The inner compensation pressing plate is movably assembled with the turning and pressing support through an installation shaft inside the assembly support penetrating the assembly frame.

[0013] A side downward sinking groove for installing an external closing plate is formed on the outer side surface of the shaft head at the opening position of the internal turning groove, and a horizontally arranged internal threaded hole is formed at the bottom of the inner side surface of the side downward sinking groove.

[0014] The upper end of the inner side surface of the external closing plate has an integrally structured top limiting strip. An inner limiting card slot matched with the top limiting strip is formed on the inner side surface of the side downward sinking groove. The external closing plate is fixedly connected with the side downward sinking groove by screwing a bottom horizontally arranged assembly bolt into the horizontally arranged internal threaded hole.

[0015] The beneficial effects of the present invention are as follows:

[0016] (1) A split axle bridge for an independent wheel set of the present invention is composed of a shaft body, a shaft head, a short shaft and a short shaft fixing cover. The shaft body and the short shaft are respectively connected to the shaft head, and the modular assembly design of the axle bridge product is realized through the assembled structure, reducing the manufacturing cost of repeated mold opening of the axle bridge product and shortening the production cycle of the product at the same time;

[0017] (2) For the axle bridge adopting the modular assembly design, only ordinary machine tool equipment is needed to perform primary processing, semi-finishing and other processes on the parts in the split state of the parts, and final finishing is carried out through special machine tool equipment after assembly, reducing the production and manufacturing cost;

[0018] (3) At the same time, lightweight materials such as cast steel or aluminum alloy can be used for the components with smaller bearing loads to realize product lightweight.

[0019] (4) Use bolts to link and control the flipping of the flipping extrusion bracket, so that the assembly firmness between the shaft body, shaft head, and short shaft can be improved by using the inner compensation extrusion plate and the lateral limiting plate. It can also limit different assembly states of the shaft head and short shaft, greatly improving the applicability and firmness. Brief Description of the Drawings

[0020] The present invention will be further described below in conjunction with the drawings and embodiments.

[0021] Figure 1 is a schematic structural diagram of the present invention.

[0022] Figure 2 is a schematic structural diagram of the shaft body in the present invention.

[0023] Figure 3 is the front view of the shaft head in the present invention.

[0024] Figure 4 is the side sectional view of the shaft head in the present invention.

[0025] Figure 5 is in the present invention Figure 1 The partial enlarged view of position C in. Detailed Description of the Invention

[0026] Now, the present invention will be further described in detail in conjunction with the drawings. These drawings are all simplified schematic diagrams, only showing the basic structure of the present invention in a schematic manner, so they only show the components related to the present invention.

[0027] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0028] Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5A split axle bridge for an independent wheel set, as shown, includes an axle body 1, axle heads 2, short axles 3 and short axle fixing covers 4. The cross-section of the axle body 1 is square or I-shaped. On both sides of the upper surface of the axle body 1, first limiting steps 5 are symmetrically provided. Inside the first limiting steps 5, axle body bolt fastening interfaces 7 with built-in bottom bolts 6 are provided. The axle body 1 is fixedly connected to the axle head 2 by screwing the bottom bolts 6 into the internal threaded holes at the lower ends of the axle heads. On the side wall of the axle head 2, an installation interface 10 with a second limiting step 8 and a third limiting step 9 on the side is provided. The short axle 3 is fixed in the installation interface 10 through the short axle fixing cover 4. On the outer side surface of the short axle 3, at the position corresponding to the third limiting step 9, there is an outwardly protruding fourth limiting step 11. The short axle fixing cover 4 is installed using an inlaid design and will not protrude beyond the outer side surface of the axle head 2 after installation, ensuring that it will not affect other components of the wheel set during installation and use.

[0029] For fitting and assembly, an interference fit is used between the short axle 3 and the axle head 2. Ensure the dimensional accuracy of the product during the press-fitting process. At the same time, the connection between the short axle 3 and the axle head 2 is doubly protected by the short axle fixing cover 4 to ensure the reliability of the connection between them.

[0030] To improve lightweight, different materials can be used for the necks of the axle body 1, axle heads 2 and short axles 3. Among them, the axle body 1 can use relevant lightweight materials, and the neck of the short axle 3 can use alloy steel materials with better material properties.

[0031] Select different lengths for the axle body 1 and short axle 3 according to the interface dimensions such as the length of the axle bridge; the axle head 2 adjusts the height difference between the axle body 1 and the short axle 2 through machining, and finally realizes modular design and assembly. Design and produce a set of molds at the initial stage of design. In the subsequent production of products, adapt to the production of different-sized axle bridges through simple machining dimension changes, and do not need to repeatedly develop and produce axle bridge product molds due to changes in the relevant interface dimensions of the axle bridge, reducing production costs and shortening the product production cycle.

[0032] To cooperate with improving the assembly stability of the axle head 2, a fifth limiting step 12 is provided on the inner threaded hole setting surface at the lower end of the axle head 2. The axle head 2 is connected to the axle body 1 by clamping the fifth limiting step 12 outside the first limiting step 5.

[0033] To cooperate with the internal flipping and extrusion linkage, an internal flipping groove 13 connected to the internal threaded hole and the fourth limiting step 11 is provided inside the axle head 2. A flipping and extrusion bracket 14 is movably assembled in the internal flipping groove 13. An inner compensation extrusion plate 15 is movably assembled on the assembly surface of the fourth limiting step 11 on the side wall of the flipping and extrusion bracket 14.

[0034] To adjust the height of the installation position of the shaft head 2, the upper surface of the flipping extrusion bracket 14 has a laterally limiting plate 16 that protrudes upward, and four adjusting limiting card slots 17 are provided on the side wall at the lower end of the short shaft 3.

[0035] To perform lateral limiting on the assembly position of the short shaft 3 and adjust the assembly position of the short shaft 3 as needed, the inner compensation extrusion plate 15 has an internal limiting rib 18 on the assembly surface adjacent to the first limiting step 5, and lateral limiting positioning slots 19 that cooperate with the internal limiting rib 18 are provided on the outer walls on both sides of the first limiting step 5.

[0036] When the bottom bolt 6 is screwed into the internal thread hole, the bottom bolt 6 squeezes the flipping extrusion bracket 14 to control the flipping extrusion bracket 14. The flipping extrusion bracket 14 controls the inner compensation extrusion plate 15 to squeeze the lateral assembly surface of the shaft body 1 from both sides. At this time, the internal limiting rib 18 of the inner compensation extrusion plate 15 is inserted into the lateral limiting positioning slot 19 to be clamped and fixed with the shaft body 1. At the same time, the laterally limiting plate 16 on the upper surface of the flipping extrusion bracket 14 is inserted into the adjusting limiting card slot 17 to perform clamping and limiting on the short shaft 3.

[0037] For movable assembly and to improve the lateral extrusion fitting property, the inner compensation extrusion plate 15 has an integral structure assembly bracket 20 that protrudes toward the internal flipping groove 13 on the surface adjacent to the flipping extrusion bracket 14. The outer surface of the flipping extrusion bracket 14 has an integral structure assembly frame 21. The inner compensation extrusion plate 15 is movably assembled with the flipping extrusion bracket 14 through the mounting shaft inside the assembly bracket 20 passing through the assembly frame 21.

[0038] To facilitate lateral assembly, a lateral sinking groove 23 for installing the outer closing plate 22 inside is provided at the opening position of the internal flipping groove 13 on the outer side of the shaft head 2, and a horizontal internal thread hole is provided at the bottom of the inner side surface of the lateral sinking groove 23.

[0039] Integral structure lateral assembly positioning shafts are provided on the inner side surface of the internal flipping groove 13 and the inner end side wall of the outer closing plate 22. The flipping extrusion bracket 14 is movably positioned and assembled by sleeving the lateral assembly positioning shafts through the tapered shaft holes on both sides.

[0040] To improve the firmness and safety of the lateral sealing structure, the upper end of the inner side surface of the outer closing plate 22 has an integral structure top limiting strip 24, and an inner limiting card slot 25 that cooperates with the top limiting strip 24 is provided on the inner side surface of the lateral sinking groove 23. The outer closing plate 22 is fixedly connected to the lateral sinking groove 23 by screwing the bottom horizontal assembly bolt 26 into the horizontal internal thread hole.

[0041] The present invention provides a split axle bridge for an independent wheelset, which consists of an axle body 1, an axle head 2, a short axle 3 and a short axle fixing cover 4. The axle body 1 and the short axle 3 are respectively connected to the axle head 2. The modular assembly design of the axle bridge product is realized through the assembled structure, which reduces the manufacturing cost of repeated mold opening of the axle bridge product and shortens the production cycle of the product. The axle bridge adopts a modular assembly design. When the parts are in a split state, only ordinary machine tools are needed to perform preliminary processing, semi-finishing and other processes on the parts. After the assembly is completed, the final finishing is performed by special machine tools, which reduces the production cost. At the same time, lightweight materials such as cast steel or aluminum alloy can be used for parts with smaller load-bearing capacity to achieve lightweight products. Bolts are used to control the flipping extrusion bracket 14 to flip, so that the inner compensation extrusion plate 15 and the lateral limit plate 16 can be used to improve the assembly firmness between the axle body 1, the axle head 2 and the short axle 3, and the different assembly states of the axle head 2 and the short axle 3 can also be limited, which greatly improves the applicability and firmness.

[0042] With the above-described preferred embodiments of the present invention as a guide, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A split axle bridge for an independent wheel set, comprising an axle body (1), axle heads (2), short axles (3) and short axle fixing covers (4), characterized in that: The cross-section of the shaft body (1) is square or I-shaped. On both sides of the upper surface of the shaft body (1), first limiting steps (5) are symmetrically provided. Inside the first limiting steps (5), a shaft body bolt fastening interface (7) for installing a bottom bolt (6) is provided. The shaft body (1) is fixedly connected to the shaft head (2) by screwing the bottom bolt (6) into the internal threaded hole at the lower end of the shaft head (2). On the side wall of the shaft head (2), an installation interface (10) with a second limiting step (8) and a third limiting step (9) on the side is provided. The short shaft (3) is fixed in the installation interface (10) by a short shaft fixing cover (4). On the outer side surface of the short shaft (3), at the position corresponding to the third limiting step (9), a fourth limiting step (11) protruding outward is provided; At the lower end of the shaft head (2) on the internal threaded hole setting surface, a fifth limiting step (12) is provided. The shaft head (2) is connected to the shaft body (1) by being stuck on the outer side of the first limiting step (5) through the fifth limiting step (12); Inside the shaft head (2), an internal flipping groove (13) communicating with the internal threaded hole and the fifth limiting step (12) is provided. Inside the internal flipping groove (13), a flipping and pressing bracket (14) is movably assembled. On the side wall of the flipping and pressing bracket (14) on the assembly surface of the fifth limiting step (12), an inner compensation pressing plate (15) is movably assembled; On the upper surface of the flipping and pressing bracket (14), a laterally limiting plate (16) protruding upward is provided. On the lower end side wall of the short shaft (3), a plurality of adjusting limiting card slots (17) are provided; On the assembly surface of the inner compensation pressing plate (15) close to the first limiting step (5), an internal limiting rib (18) is provided. On the outer walls on both sides of the first limiting step (5), lateral limiting positioning grooves (19) matching the internal limiting rib (18) are provided.

2. The split axle bridge for an independent wheel set according to claim 1, characterized in that: The short shaft (3) and the shaft head (2) are press-fitted with an interference fit.

3. The split axle bridge for an independent wheel set according to claim 1, characterized in that: The shaft body (1), the shaft head (2), and the neck of the short shaft (3) are made of different materials. Among them, the shaft body (1) is made of relevant lightweight materials, and the neck of the short shaft (3) is made of alloy steel materials with better material properties.

4. The split axle bridge for an independent wheel set according to claim 1, characterized in that: On the surface of the inner compensation pressing plate (15) close to the flipping and pressing bracket (14), an integral structure assembly bracket (20) protruding toward the internal flipping groove (13) is provided. On the outer side surface of the flipping and pressing bracket (14), an integral structure assembly frame (21) is provided. The inner compensation pressing plate (15) is movably assembled with the flipping and pressing bracket (14) by an installation shaft inside the assembly bracket (20) passing through the assembly frame (21).

5. A split axle bridge for an independent wheel set according to claim 1, characterized in that: On the outer side surface of the shaft head (2) at the opening position of the internal flipping groove (13), a side downward sinking groove (23) for installing an internal outer closing plate (22) is provided. At the bottom of the inner side surface of the side downward sinking groove (23), a horizontally arranged internal threaded hole is provided.

6. The split axle bridge for an independent wheel set according to claim 5, characterized in that: The upper end of the inner side of the outer closing plate (22) has an integrally structured top limiting strip (24). An inner limiting card slot (25) that cooperates with the top limiting strip (24) is provided on the inner side of the side sinking groove (23). The outer closing plate (22) is fixedly connected to the side sinking groove (23) by screwing a bottom horizontal assembly bolt (26) into a horizontal internal thread hole.

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