A method for preventing axial movement of a load wheel protective cover in a rubber wheel and steel wheel double-track subway

Abstract

The application discloses a kind of rubber wheel steel wheel double-track subway load bearing wheel protective cover anti-axial movement method, which is by increasing the rigid axial limiting structure between the rim groove part of rim and protective cover to prevent the axial movement of protective cover.The application can effectively prevent the axial movement of protective cover outward in high-frequency vibration working environment, thereby avoiding the protective cover shedding problem caused by the axial movement of protective cover outward.

Description

Technical Field

[0001] This invention relates to a method for preventing axial movement of a protective cover, and more particularly to a method for preventing axial movement of a protective cover for a load-bearing wheel in a rubber-tired and steel-wheeled double-track subway. Background Technology

[0002] With the rapid development of my country's economy and the continuous improvement of its comprehensive national strength in recent years, the urban rail transit industry has also been booming. Although some emerging rail transit systems such as trams, maglev trains, and monorails have risen rapidly in recent years, and urban rail transit systems are becoming more diversified and coordinated in multiple systems, subways remain the most important mode of transportation to alleviate passenger flow pressure in cities, especially large and medium-sized cities.

[0003] my country's mature subway vehicles are mainly steel-wheeled and steel-railed. However, as major cities have increasingly higher standards and requirements for the ecological environment in the development of rail transit, rubber-wheeled vehicles have begun to receive widespread attention.

[0004] Rubber-tired and steel-wheeled dual-rail vehicles have a long history of use abroad and are widely used. Rubber-tired and steel-wheeled dual-rail subway vehicles are based on traditional steel-wheeled and steel-rail vehicles, with the addition of a rubber-tired running gear and a rubber-tired guiding system. For example... Figure 1 As shown, a load-bearing wheel 2 is coaxially mounted on the outer side of the steel wheel 1. A guide wheel 3 is horizontally positioned in front of the steel wheel 1 and the load-bearing wheel 2. The load-bearing wheel 2 and the guide wheel 3 are rubber tires. A steel rail 4 is positioned below the steel wheel 1, a rubber tire track 5 is positioned below the load-bearing wheel 2, and a guide track 6 is positioned on one side of the guide wheel 3. This type of vehicle has two sets of running gear: a steel wheel and steel rail system and a rubber tire running system. Under normal operating conditions, the vehicle is driven forward by the rubber tire running system, with the rubber tires running on two flat tracks. At this time, the steel wheel is suspended in the air, and there is a certain gap between the steel wheel and the steel rail. Once the rubber tire leaks air or a tire bursts, the vehicle body quickly sinks. At this time, the steel wheel comes into contact with the steel rail, and the wheel flanges on both sides are tightly locked between the two steel rails. The vehicle is then supported by the safety spare steel wheel and decelerates along the steel rail, providing a safety protection function.

[0005] like Figure 2 As shown, a rim 7 is installed at both ends of each axle 8 of the axle, and a tire 9 is installed on each rim 7. A circular protective cover 10 is installed on the outer end face of each rim 7. The protective cover 10 covers the end of the axle 8 and the outer end face of the rim 7. The subway power supply line 11 is also installed near the end of the axle. The protective cover is made of ABS plastic and its function is to prevent electric arc and dust.

[0006] The connection structure between the protective cover 10 and the rim 7 is as follows: Figure 3As shown, the side of the installed protective cover 10 facing the rim 7 is the inner part B of the protective cover 10, and the side of the installed protective cover 10 facing the power supply line 11 is the outer part C of the protective cover 10. Multiple retaining springs 12 are provided on the inner part B of the protective cover 10 along its circumference. One end of each retaining spring 12 is connected to the inner part of the protective cover 10 by a bolt 13 and a nut 14. A spring hook 121 is bent at the other end of each retaining spring 12. A protruding rim groove 711 is provided at the outer end of the rim 7. 11 is provided with a full circle. When the tire 9 is installed, it is pressed tightly against the outer side of the rim groove 711. The spring hooks 121 of multiple retaining springs 12 engage and hook together with the inner side of the rim groove 711. Since the retaining springs 12 are elastic, they form an interference fit with the rim groove 711 when hooked. Since both the retaining springs 12 and the rim groove 711 are made of metal, friction is also generated between them when hooked. Through the above-mentioned forces, the protective cover 10 can be connected to the outer end face of the rim 7 by using multiple retaining springs 12.

[0007] like Figure 3 As shown, in the prior art, the retaining spring 12 is connected to the protective cover 10 by a bolt 13, which passes through the protective cover 10 and the retaining spring 12 and is inserted into the protective cover 10 towards the inner side B of the protective cover 10 and locked with the nut 14. When the protective cover 10 is installed, only the nut 131 of the bolt 13 is located on the outer side of the protective cover 10, while the bolt stub 132 and the nut 14 are located on the inner side of the protective cover 10. Since the risk of arcing between the nut 131 and the power supply line 11 only exists on the outer side of the protective cover 10, the nut 131 of the bolt 13 is the only one at risk of arcing with the power supply line 11. Therefore, in the prior art, the material of the nut 131 is changed to a non-conductive material to avoid the risk of arcing.

[0008] In practice, the applicant found that the problem was that during actual vehicle operation, after the vehicle had been running for a period of time, the protective cover would often move axially outward (i.e., away from the rim), causing the protective cover to fall off.

[0009] A search revealed no patent documents that are identical or similar to this application.

[0010] In summary, this paper explores a method for designing a protective cover for the load-bearing wheels in a rubber-tired and steel-wheeled double-track subway to prevent axial movement of the protective cover outwards after the vehicle has been running for a period of time, thereby preventing the protective cover from falling off. Summary of the Invention

[0011] The technical problem to be solved by the present invention is to address the deficiencies in the prior art by providing a method for preventing axial movement of the protective cover of the load-bearing wheel in a rubber-tired and steel-wheeled double-track subway. This method can prevent the protective cover from moving outward axially during daily operation and prevent the protective cover from falling off.

[0012] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: a method for preventing axial movement of the protective cover of the load-bearing wheel in a rubber-tired steel wheel double-track subway, which prevents the protective cover from moving axially by increasing the rigid axial limiting structure between the rim groove and the protective cover.

[0013] Preferably, the rigid axial limiting structure has multiple pins on the inner side of the protective cover along the circumference of the protective cover, and each pin can extend radially along the protective cover.

[0014] After the protective cover is engaged with the outer end face of the rim by multiple snap ring springs on the inner side of the protective cover and the rim groove, multiple pins extend radially along the protective cover and are inserted into the rim groove to form a rigid axial limiting structure.

[0015] Preferably, a rigid positioning component is also provided on the inner side of the protective cover. When the protective cover is hooked onto the outer end face of the rim by the snap ring and the rim groove, the rigid positioning component cooperates with the rim groove to rigidly position the protective cover axially.

[0016] Preferably, the rigid positioning element is an axial positioning rib provided on the inner side of the protective cover; when the protective cover is hooked onto the outer end face of the rim by the snap ring and the rim groove, the outer side of the rim groove end of the rim groove first contacts one end face of the axial positioning rib to rigidly position the protective cover in the axial direction, and then multiple pins extend radially along the protective cover and are inserted into the rim groove of the rim to form a rigid axial limiting structure.

[0017] Preferably, the plurality of retaining springs and the plurality of pins are arranged in an alternating manner.

[0018] Preferably, a pin bevel is provided at one end of the protruding pin, and a groove bevel matching the pin bevel is provided on the inner side of the rim groove of the rim; when one end of the pin is inserted into the rim groove of the rim and contacts the rim groove, the pin bevel contacts the groove bevel of the rim groove through the pin bevel.

[0019] Preferably, the plurality of pins are set on the inner side of the protective cover through a disassembly and assembly connection structure; the pins are not installed before the protective cover is installed. After the protective cover is engaged with the outer end face of the rim by the plurality of snap ring springs on the inner side of the protective cover and the rim groove of the rim, the pins are then installed on the protective cover so that one end of the pin is inserted into the rim groove of the rim and contacts the rim groove.

[0020] Preferably, the disassembly and assembly connection structure has multiple pin mounting seats provided on the inner side of the protective cover along the circumference of the protective cover; along the radial direction of the protective cover, a pin through groove is opened on the pin mounting seat, the inner groove opening at one end of the pin through groove is located in the inner space of the protective cover, and the outer groove opening at the other end of the pin through groove is located in the outer space of the protective cover; threaded holes and through holes are respectively provided on the opposite sides of the pin through groove along the direction parallel to the central axis of the protective cover.

[0021] After the protective cover is engaged with the outer end face of the rim by multiple snap ring springs on the inner side of the protective cover and the rim groove of the rim, the pin is then inserted into the pin through slot from the outer space of the protective cover through the outer slot of the pin through slot, so that one end of the pin passes through the inner slot of the pin through slot and extends into the rim groove of the rim to contact the rim groove. Finally, the pin screw passes through the through hole and the pin and is screwed into the threaded hole, thereby locking the pin on the pin mounting seat.

[0022] Preferably, the pin screw is made of an insulating non-metallic material.

[0023] The beneficial effects of this invention are as follows: This invention not only uses an axial limiting structure formed between the hook portion of the retaining spring and the groove portion of the rim for axial limiting, as in existing technologies, but also adds a rigid axial limiting structure between the groove portion of the rim and the protective cover to axially limit the protective cover. Therefore, this invention can effectively prevent axial movement of the protective cover in high-frequency vibration working environments, thereby avoiding the protective cover from falling off due to axial movement. The rigid axial limiting structure is formed by a pin installed on the inner side of the protective cover and engaging with the groove portion of the rim. The pin is rigid, unlike the retaining spring which is elastic. Therefore, even in high-frequency vibration working environments, no elastic deformation will occur between the pin and the groove portion of the rim. By adding a rigid axial positioning structure between the protective cover and the rim, the protective cover can be precisely positioned axially when it is engaged with the outer end face of the rim by multiple snap springs on the inner side of the protective cover and the rim groove. This ensures that the pins on each protective cover can contact the rim groove. The design of the disassembly and assembly structure between the pins and the protective cover allows the invention to first initially install the protective cover on the outer end of the rim using snap springs, and then insert the pins to contact the rim groove. This achieves the function of axial positioning through the engagement of the pins with the rim groove, while also facilitating the installation and removal of the pins, making it simple and practical. Attached Figure Description

[0024] Figure 1 A schematic diagram of the running gear structure of an existing rubber-tired and steel-wheeled dual-track subway vehicle;

[0025] Figure 2 This is a schematic diagram of the axial cross-sectional structure of the wheelset of an existing rubber-tired and steel-wheeled dual-track subway vehicle.

[0026] Figure 3 for Figure 2 Enlarged structural diagram of section A in the middle;

[0027] Figure 4 This is a schematic diagram of the main structure of the protective cover in an embodiment of the present invention (viewed from the inner side of the protective cover).

[0028] Figure 5 for Figure 4 A schematic diagram of the axial cross-sectional structure along the EE line;

[0029] Figure 6 for Figure 5 Enlarged structural diagram of section F in the middle;

[0030] Figure 7 This is an axial cross-sectional view of the protective cover at one end of the axle after it is installed on the rim in an embodiment of the present invention.

[0031] Figure 8 for Figure 7 Enlarged structural diagram of section G in the middle;

[0032] Figure 9 This is a schematic diagram of the three-dimensional structure of the protective cover in an embodiment of the present invention. Figure 1 (The latch was not installed);

[0033] Figure 10 This is a schematic diagram of the three-dimensional structure of the protective cover in an embodiment of the present invention. Figure 2 (The latch has been installed);

[0034] Figure 11 for Figure 10 Enlarged structural diagram of section I;

[0035] Figure 12 for Figure 11 A schematic diagram of the structure after removing the pin;

[0036] Figure 13 for Figure 9 Enlarged structural diagram of the middle L section;

[0037] Figure 14 This is a schematic diagram illustrating the principle process of installing the latch in an embodiment of the present invention;

[0038] Figure 15 for Figure 5 A partial cross-sectional view of the structure located at a snap ring spring;

[0039] In the diagram: 1. Steel wheel, 2. Load-bearing wheel, 3. Guide wheel, 4. Steel rail, 5. Rubber-tired rail, 6. Guide rail, 7. Ridge, 711. Ridge groove, 712. Groove slope, 713. Ridge groove end, 8. Axle, 9. Tire, 10. Protective cover, 101. Protective cover ring, 102. Circular surface, 103. Protective cover recess, 11. Power supply line, 12. Snap spring, 121. Snap spring hook, 13. Bolt 1, 131. Nut 1, 132. Screw 1, 14. Nut, 15. Pin, 151. Pin slope, 16. Pin mounting seat, 161. Pin through groove, 1611. Inner groove, 1612. Outer groove, 162. 163. Threaded hole; 17. Through hole; 18. Pin screw; 19. Axial positioning rib; 20. Locking nut; 21. Bolt II; 22. Nut II; 23. Screw II; 24. Insulating sleeve; 25. Insulating threaded cap. Detailed Implementation

[0040] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] In daily work, when the protective cover frequently detaches, the applicant discovered through research that one of the reasons is that in practical applications, the protective cover operates in a high-frequency vibration environment. Furthermore, the protective cover is connected via several snap rings and spring clips that engage with the grooves in the rim. Figure 3 As shown, in the prior art, the axial movement of the protective cover is mainly prevented by the axial limiting structure formed between the spring hook portion 121 of the retaining spring 12 and the rim groove portion 711 of the rim 7. However, since the protective cover is in a high-frequency vibration working environment, and the retaining spring 12 has elastic deformation, sometimes under high-frequency vibration, the hook structure between the spring hook portion 121 of the retaining spring 12 and the rim groove portion 711 of the rim 7 may loosen, causing the protective cover to move axially outward. Under long-term high-frequency vibration, the protective cover may fall off.

[0042] Example 1: As Figures 4 to 6 As shown, the applicant, through improvement, has provided a plurality of pins 15 on the inner side B of the protective cover 10 along the circumference of the protective cover 10, each pin 15 extending radially out of the protective cover 10. Figure 7 and Figure 8 As shown, after the protective cover 10 is installed, one end of each pin 15 is inserted radially into the rim groove 711 of the rim and contacts the rim groove 711. The axial limiting structure formed between the pin 15 and the rim groove 711 limits the protective cover 10. When the protective cover 10 tends to move axially outward under high-frequency vibration, the rigid axial limiting structure formed between the pin 15 and the rim groove 711 limits the protective cover 10 axially and prevents the protective cover 10 from moving axially outward.

[0043] In preventing axial movement of the protective cover, this embodiment does not simply rely on the axial limiting structure formed between the hook portion of the snap ring and the groove portion of the rim, as in existing technologies. This embodiment also adds an axial limiting structure between a pin and the groove portion of the rim for axial limiting of the protective cover. Furthermore, the pin is rigid, unlike the snap ring which is elastic. Therefore, even in high-frequency vibration environments, no elastic deformation occurs between the pin and the groove portion of the rim. Thus, this embodiment effectively prevents axial movement of the protective cover in high-frequency vibration environments, thereby avoiding the protective cover from detaching due to axial movement.

[0044] like Figure 6 and Figure 8As shown, a pin bevel 151 is provided on the protruding end of the pin 15, and a groove bevel 712 matching the pin bevel 151 is provided on the inner side of the rim groove 711 of the rim. When one end of the pin 15 is inserted into the rim groove 711 and contacts the rim groove 711, the contact occurs through the pin bevel 151 of the pin 15 and the groove bevel 712 of the rim groove 711. This design further increases the contact area between the pin 15 and the rim groove 711, thereby better preventing axial movement of the protective cover.

[0045] like Figure 4 As shown, multiple retaining springs 12 and multiple pins 15 are staggered along the circumference of the protective cover. In this figure, there are a total of three retaining springs 12 and three pins 15, which are staggered to better prevent axial movement of the protective cover.

[0046] like Figure 4 As shown, with the central axis F1 of the protective cover 10 as the center, the maximum outer diameter of the multiple pins 15 is set as d1, as follows: Figure 2 As shown, with the central axis F2 of the rim 7 as the center, the minimum inner diameter of the rim groove 711 of the rim 7 is set as d2. Then, from... Figure 8 As can be seen, when the protective cover 10 is installed, the maximum outer diameter d1 of the pin is greater than the minimum inner diameter of the rim groove. Since the pin 15 is rigid, unlike the elastic spring 12, interference occurs between the pin 15 and the rim groove 711 when the protective cover 10 is installed, preventing installation. To solve this problem, after research, the applicant designed the connection structure between the pin 15 and the protective cover 10 as a detachable connection structure. When installing the protective cover, the spring hooks 121 of multiple springs 12 are first engaged with the inner sides of the rim groove 711 to initially install the protective cover 10 (e.g., ...). Figure 7 As shown), the pin 15 is then installed from the outer side of the protective cover 10 to the inner side of the protective cover 10 through the disassembly and assembly structure, so that one end of the pin 15 extends out and is inserted into the rim groove 711 of the rim and contacts the rim groove 711.

[0047] Specific disassembly and assembly structure as follows Figure 9 and Figure 10 As shown, along the circumference of the protective cover 10, a plurality of cuboid pin mounting seats 16 are provided on the inner side of the protective cover 10. The pin mounting seats 16 and the protective cover 10 are an integral structure, as shown in the figure. Figure 12 and Figure 13As shown, the outer surface J of each pin mounting base 16 is parallel to the circumferential surface of the protective cover 10, and the bottom surface K of the pin mounting base 16 is perpendicular to the axis of the protective cover 10. The outer surface J is adjacent to the bottom surface K. Along the radial direction of the protective cover 10, a pin through groove 161 is formed on the outer surface J of the pin mounting base 16. The inner groove opening 1611 at one end of the pin through groove 161 is located in the internal space of the protective cover 10, and the outer groove opening 1612 at the other end of the pin through groove 161 is located in the external space of the protective cover 10. The external space and the internal space of the protective cover 10 are connected through the pin through groove 161. Along the direction parallel to the central axis F1 of the protective cover 10, a threaded hole 162 and a through hole 163 are respectively provided on opposite sides of the pin through groove 161. The threaded hole 162 is located on the bottom surface K of the pin mounting base 16, and the through hole 163 is connected to the external space of the protective cover.

[0048] After the protective cover 10 is engaged with the outer end face of the rim 7 by the snap ring spring 12, the pin 15 is then inserted from the external space of the protective cover 10 through the outer slot 1612 of the pin through slot 161 into the pin through slot 161 (e.g. Figure 14 As shown), one end of the pin 15 passes through the inner groove 1611 of the pin through slot 161 and extends into the rim groove 711 of the rim, contacting the rim groove 711 (as shown). Figure 11 and Figure 8 As shown), the pin 15 is finally locked onto the pin mounting base 16 by passing the pin screw 17 through the through hole 163 and the pin 15 and screwing it into the threaded hole 162. Since the nut of the pin screw 17 is located on the outer side of the protective cover 10 after installation, the pin screw 17 is made of insulating non-metallic material to prevent arcing. In this embodiment, as... Figure 5 and Figure 9 As shown, the protective cover 10 includes a protective cover ring 101, a circular surface 102 located within the protective cover ring 101, and a protective cover recess 103 located between the protective cover ring 101 and the circular surface 102. The circular surface 102 and the protective cover ring 101 are connected by the protective cover recess 103. The circular surface 102, the protective cover ring 101, and the protective cover recess 103 are an integral structure. Figure 13 As shown, the outer groove 1612 of the pin through groove 161 is connected to the protective cover groove 103.

[0049] Another issue to consider is ensuring accurate positioning of the pins after installation, so that one end of the pin contacts the groove of the rim for axial restraint after being installed on the protective cover. Since the protective covers are initially installed onto the rim via spring clips, and these spring clips are elastic, there is no rigid axial positioning element. Therefore, after the protective covers are installed on the rim via the spring clips, the axial position of each protective cover is not fixed; that is, it is unknown whether the protective cover is installed correctly. Without rigid axial positioning for each protective cover, some pins on the protective covers may not contact the groove of the rim after installation, leaving gaps. To solve the above problem, such as... Figure 11 and Figure 12 As shown, each pin mounting seat 16 has an axial positioning rib 18 on its outer surface J. The axial positioning rib 18 is arranged in a direction parallel to the central axis F1 of the protective cover. There are multiple axial positioning ribs 18. A gap D is left between one end face of the axial positioning rib 18 and the inner groove 1611 of the pin through groove 161. The gap D is to accommodate the end of the rim groove. Figure 8 As shown, during installation, the protective cover is first precisely and rigidly positioned axially by contacting the outer side of the rim groove end 713 of the rim groove portion 711 with one end face of the axial positioning rib 18. This ensures that the protective cover is properly installed on the rim when mounted via the retaining spring. Then, the pin 15 is installed on the protective cover 10, with one end of the pin 15 extending and inserting into the rim groove portion 711. At this time, the rim groove end 713 is located within the spacing D. By setting the axial positioning rib 18, precise and rigid positioning of each protective cover in the axial direction is ensured, thereby guaranteeing that the pin on each protective cover can contact the rim groove portion to form a rigid axial limiting structure. Furthermore, the axial positioning rib also prevents the protective cover from moving inwards.

[0050] In addition, such as Figure 15 As shown, in this embodiment, the locking nut 19 and bolt 20 are used to lock the retaining spring 12 onto the inner side B of the protective cover 10, thereby increasing the stability of the connection. Bolt 20 is longer than bolt 13. The locking nut 19 is a type 2 non-metallic insert hexagonal flange locking nut according to GB / T 6183.1-2016, with a size specification of M10. The reason for increasing the length of bolt 20 is twofold: firstly, the thickness of this locking nut (along the bolt's axial direction) is thicker than that of ordinary nuts, and if bolt 13 of the previous length is used, it will not be able to match the locking nut 19; secondly, increasing the length of bolt 20 also improves the stability of the connection from another aspect.

[0051] However, if the bolt 20 is installed in the same way after its length is increased, it will interfere with the deformation space of the retaining spring 12. Therefore, in this embodiment, the bolt 20 is installed in reverse. That is, the retaining spring 12 is connected by the bolt 20 through the inner part B of the protective cover 10, through the retaining spring 12 and the protective cover 10, towards the outer part C of the protective cover 10, and locked with the anti-loosening nut 19. After installation, the nut 201 of the bolt 20 is located inside the protective cover 10, and the screw part 202 of the bolt 20 and the anti-loosening nut 19 are located outside the protective cover 10. As can be seen from the figure, after this reverse installation, the closest distance L between the nut 201 and the retaining spring 12 is relatively large, thus leaving sufficient elastic deformation space for the retaining spring 12. An insulating component is installed outside the screw section 202 and the anti-loosening nut 19 located on the outer side of the protective cover 10. This ensures that the screw section 202 and the anti-loosening nut 19 are located inside the insulating component, thereby preventing the risk of arcing between them and the power supply line. The insulating component includes an insulating sleeve 21 and an insulating threaded cap 22. The insulating sleeve 21 is fitted onto the outside of the screw section 202 and the anti-loosening nut 19. The insulating threaded cap 22 is then tightened onto the end of the screw section 202. The insulating sleeve 21 is pressed against the outer side C of the protective cover 10 by the insulating threaded cap 22, thus placing the screw section 202 and the anti-loosening nut 19 inside the insulating sleeve 21 and the insulating threaded cap 22 for insulation. The insulating sleeve 21 can be made of nylon, and the insulating threaded cap 22 can be made of non-metallic threaded caps, such as those made of plastic or polymer materials.

[0052] In summary, this invention goes beyond the existing technology, which merely uses an axial limiting structure formed between the hook portion of the retaining spring and the groove portion of the rim for axial limiting. It adds a rigid axial limiting structure between the groove portion of the rim and the protective cover to further limit the axial movement of the protective cover. Therefore, this invention effectively prevents axial movement of the protective cover in high-frequency vibration environments, thus avoiding the protective cover from detaching due to axial movement. The rigid axial limiting structure is formed by a pin installed on the inner side of the protective cover that engages with the groove portion of the rim. The pin is rigid, unlike the retaining spring which is elastic. Therefore, even in high-frequency vibration environments, no elastic deformation occurs between the pin and the groove portion of the rim. By adding a rigid axial positioning structure between the protective cover and the rim, the protective cover can be precisely positioned axially when it is engaged with the outer end face of the rim by multiple snap springs on the inner side of the protective cover and the rim groove. This ensures that the pins on each protective cover can contact the rim groove. The design of the disassembly and assembly structure between the pins and the protective cover allows the invention to first initially install the protective cover on the outer end of the rim using snap springs, and then insert the pins to contact the rim groove. This achieves the function of axial positioning through the engagement of the pins with the rim groove, while also facilitating the installation and removal of the pins, making it simple and practical.

[0053] In this embodiment, "multiple" refers to "two or more". The above embodiments are for illustrative purposes only and are not intended to limit the invention. Those skilled in the art can make various changes or modifications without departing from the spirit and scope of the invention. Therefore, all equivalent technical solutions should also fall within the protection scope of this invention, which is defined by the claims.

Claims

1. A method for preventing axial movement of a protective cover for a load-bearing wheel in a rubber-tired and steel-wheeled double-track subway, characterized in that: Axial movement of the protective cover is prevented by adding a rigid axial limiting structure between the rim groove and the protective cover. The rigid axial limiting structure has multiple pins on the inner side of the protective cover along the circumference of the protective cover, and each pin can extend radially along the protective cover. After the protective cover is engaged with the outer end face of the rim by multiple snap ring springs on the inner side of the protective cover and the rim groove, multiple pins extend radially along the protective cover and are inserted into the rim groove to form a rigid axial limiting structure. A rigid positioning component is also provided on the inner side of the protective cover. When the protective cover is hooked onto the outer end face of the rim by the snap ring and the rim groove, the rigid positioning component cooperates with the rim groove to rigidly position the protective cover axially.

2. The method for preventing axial movement according to claim 1, characterized in that: The rigid positioning component is an axial positioning rib set on the inner side of the protective cover. When the protective cover is hooked onto the outer end face of the rim by the snap ring and the rim groove, the outer side of the rim groove end of the rim groove first contacts one end face of the axial positioning rib to rigidly position the protective cover in the axial direction. Then, multiple pins extend radially along the protective cover and are inserted into the rim groove of the rim to form a rigid axial limiting structure.

3. The method for preventing axial movement according to claim 2, characterized in that: The multiple retaining springs and multiple pins are arranged in an alternating pattern.

4. The method for preventing axial movement according to claim 2, characterized in that: A pin bevel is provided at one end of the protruding pin, and a groove bevel matching the pin bevel is provided on the inner side of the rim groove. When one end of the pin is inserted into the groove of the rim and comes into contact with the groove, the pin bevel of the pin contacts the groove bevel of the rim.

5. The method for preventing axial movement according to any one of claims 1 to 4, characterized in that: The multiple pins are set on the inner side of the protective cover through a disassembly and assembly connection structure. The pins are not installed before the protective cover is installed. After the protective cover is engaged with the outer end face of the rim by multiple snap springs on the inner side of the protective cover and the rim groove, the pins are then installed on the protective cover so that one end of the pin is inserted into the rim groove and contacts the rim groove.

6. The method for preventing axial movement according to claim 5, characterized in that: The disassembly and assembly connection structure is as follows: along the circumference of the protective cover, multiple pin mounting seats are provided on the inner side of the protective cover; along the radial direction of the protective cover, a pin through groove is opened on the pin mounting seat, the inner groove opening at one end of the pin through groove is located in the inner space of the protective cover, and the outer groove opening at the other end of the pin through groove is located in the outer space of the protective cover; along the direction parallel to the central axis of the protective cover, threaded holes and through holes are respectively provided on the opposite sides of the pin through groove. After the protective cover is engaged with the outer end face of the rim by multiple snap ring springs on the inner side of the protective cover and the rim groove of the rim, the pin is then inserted into the pin through slot from the outer space of the protective cover through the outer slot of the pin through slot, so that one end of the pin passes through the inner slot of the pin through slot and extends into the rim groove of the rim to contact the rim groove. Finally, the pin screw passes through the through hole and the pin and is screwed into the threaded hole, thereby locking the pin on the pin mounting seat.

7. The method for preventing axial movement according to claim 6, characterized in that: The pin screw is made of an insulating non-metallic material.

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