Train wheel assembly and train

Abstract

The application provides a train wheel assembly and a train, and relates to the technical field of trains. The train wheel assembly comprises an axle, a wheel and a rear cover. A mounting hole is arranged at the center of the rear end of the wheel. The end of the axle is embedded into the mounting hole and connected with the wheel in a rotating mode. The rear cover is annular, and is sleeved on the outer side of the axle. The axle is in clearance fit with the inner wall of the rear cover. The rear cover is tightly connected with the rear end of the wheel, and covers the rear end of the mounting hole. A dynamic sealing element is arranged between the rear cover and the axle to seal the clearance between the axle and the rear cover. A first static sealing element is arranged between the rear cover and the wheel to seal the clearance between the rear cover and the wheel. The train comprises the train wheel assembly. The train wheel assembly and the train provided by the application have the advantages that the rear end of the mounting hole of the wheel has good sealing performance, foreign matters are not easy to enter the mounting hole, the lubricating medium in the mounting hole is not easy to deteriorate and leak, and the train wheel assembly is not easy to be damaged.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of train technology, in particular to a train wheel assembly and a train. BACKGROUND

[0002] The train is a train composed of a traction locomotive and a car for carrying goods or passengers, which is used for driving on the rail, including a train body and a train wheel assembly installed at the bottom of the train body.

[0003] The existing train wheel assembly includes an axle, a wheel and a rear cover, the axle is installed below the train body, the end of the axle is rotatably connected with the wheel through the mounting hole provided at the center position of the rear end of the wheel, the rear end of the mounting hole is capped by the rear cover which is tightly connected with the rear end of the wheel, wherein the felt ring for sealing the gap between the axle and the rear cover is arranged between the rear cover and the axle, and the lubricating medium for reducing the friction resistance when the wheel rotates is filled in the mounting hole.

[0004] The existing train wheel assembly, when in harsh environment, the lubricating medium in the mounting hole is prone to deterioration, resulting in serious wear of the train wheel assembly. SUMMARY

[0005] The present application aims to provide a train wheel assembly and a train to solve the problem of serious wear of the train wheel assembly caused by the deterioration of the lubricating medium in the mounting hole in the prior art.

[0006] In one aspect, the present application provides a train wheel assembly, which comprises an axle, a wheel and a rear cover.

[0007] The center position of the rear end of the wheel is provided with a mounting hole, and the end of the axle is embedded in the mounting hole and rotatably connected with the wheel.

[0008] The rear cover is annular, the rear cover is sleeved on the outside of the axle, the axle is gap-fitted with the inner wall of the rear cover, the rear cover is tightly connected with the rear end of the wheel, and the rear end of the mounting hole is capped by the rear cover.

[0009] A dynamic seal for sealing the gap between the axle and the rear cover is arranged between the rear cover and the axle, and a first static seal for sealing the gap between the rear cover and the wheel is arranged between the rear cover and the wheel.

[0010] Optionally, a hole elastic retainer for limiting the axial movement of the dynamic seal along the rear cover is further installed on the inner wall of the rear cover.

[0011] Optionally, the inner wall of the rear cover comprises a first segment, a second segment, a third segment and a fourth segment which are sequentially arranged from front to back along the axial direction of the rear cover.

[0012] The inner diameter of the first section is smaller than that of the second section, the inner diameter of the second section is smaller than that of the third section, and the inner diameter of the fourth section is larger than that of the second section and smaller than that of the third section.

[0013] The first section is in clearance fit with the axle, and a through hole is arranged on the end face of the first section and communicates the front of the first section with the inner side space of the second section, and the axis of the through hole is parallel to the axis of the rear cover.

[0014] The dynamic seal is mounted on the second section, and the rear end of the first section is used to limit the forward movement of the dynamic seal.

[0015] The length of the third section corresponds to the thickness of the elastic retainer ring for the hole, the elastic retainer ring for the hole is mounted on the third section, and the elastic retainer ring for the hole is used to limit the rearward movement of the dynamic seal.

[0016] The front end of the fourth section is used to limit the rearward movement of the elastic retainer ring for the hole.

[0017] Optionally, the dynamic seal is a skeleton oil seal.

[0018] And / or, the first static seal is a first sealing ring, the front end of the rear cover is provided with a first sealing groove for mounting the first sealing ring, and the first sealing ring mounted in the first sealing groove cooperates with the first sealing groove and the rear end of the wheel to seal the gap between the rear cover and the wheel.

[0019] Optionally, the dynamic seal is a three-lip skeleton oil seal.

[0020] And / or, the front end of the rear cover is provided with an annular first positioning protrusion, the first positioning protrusion is adapted to the rear end of the mounting hole and is used to extend into the mounting hole, the first sealing groove is arranged at the root of the first positioning protrusion, the edge of the rear end of the mounting hole is a first chamfer structure, the first sealing ring is mounted in the space defined by the first sealing groove and the first chamfer structure, and the first sealing ring cooperates with the first sealing groove and the first chamfer structure to seal the gap between the rear cover and the wheel.

[0021] Optionally, the mounting hole is a through hole, the front end of the wheel is fixedly connected with a front cover used to cover the front end of the mounting hole, and a second static seal is arranged between the front cover and the wheel to seal the gap between the front cover and the wheel.

[0022] An oil cup is arranged on the front cover and is used to inject lubricating medium into the mounting hole.

[0023] Optionally, the second static seal is a second sealing ring, and the rear end of the front cover is provided with a second sealing groove for mounting the second sealing ring.

[0024] The rear end of the front cover is provided with a ring-shaped second positioning protrusion, the second positioning protrusion is matched with the front end of the mounting hole, and is used for extending into the mounting hole; the second sealing groove is arranged at the root of the second positioning protrusion; the edge of the front end of the mounting hole is a second chamfer structure; the second sealing ring is arranged in the space defined by the second sealing groove and the second chamfer structure; and the second sealing ring is matched with the second sealing groove and the second chamfer structure, so as to seal the gap between the front cover and the wheel.

[0025] Optionally, a bearing is arranged in the mounting hole, and the axle is rotationally connected with the wheel through the bearing.

[0026] The bearing comprises an outer ring, an inner ring and an end cover, the inner ring and the outer ring are rotationally connected, the end cover is tightly connected with the front end of the inner ring, the outer ring is tightly connected with the hole wall of the mounting hole, the end of the axle is embedded in the inner ring, at least two first bolts are arranged to be threadedly connected with the front end of the axle through the end cover, and the opposite side walls of the bolt heads of the adjacent first bolts are connected through a connecting piece, and the connecting piece is used for limiting the relative rotation of the two first bolts connected by the connecting piece.

[0027] Optionally, the connecting piece is a wire.

[0028] In another aspect, the application provides a train, which comprises a train body and the train wheel assembly.

[0029] The train wheel assembly and the train provided by the application can seal the gap between the rear cover and the axle through the dynamic sealing piece, and seal the gap between the rear cover and the rear end of the wheel through the first static sealing piece, so that the sealing performance of the rear end of the mounting hole of the wheel is improved, the foreign matters entering the mounting hole of the wheel through the rear cover and the leakage of the lubricating medium in the mounting hole are reduced, the lubricating medium is prevented from being deteriorated due to the mixing of the foreign matters, the risk of the damage of the train wheel assembly, the pollution of the environment and other problems is reduced, and the frequency of replacing the lubricating medium is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without any creative labor.

[0031] Figure 1 The assembly diagram of the wheel and the axle in the embodiment of the train wheel assembly provided by the application;

[0032] Figure 2 The cross-sectional view of the rear cover along the axial plane in the embodiment of the train wheel assembly provided by the application;

[0033] Figure 3 Schematic view of the rear end of the rear cover in the embodiment of the train wheel assembly provided by the present application.

[0034] Legend of reference signs:

[0035] 100, axle; 110, first connecting section; 120, second connecting section; 130, main body section; 200, wheel; 210, mounting hole; 211, first chamfer structure; 212, second chamfer structure; 300, rear cover; 310, first positioning protrusion; 320, first section; 321, communication hole; 330, second section; 340, third section; 350, fourth section; 360, first sealing groove; 370, first fastening hole; 380, second bolt; 400, front cover; 410, second positioning protrusion; 420, oil cup; 430, third bolt; 500, bearing; 510, first bearing; 520, second bearing; 530, inner ring; 531, first inner ring; 532, second inner ring; 540, outer ring; 550, end cover; 560, first bolt; 570, iron wire; 600, dynamic seal; 700, first static seal; 800, second static seal; 900, elastic retainer ring for hole. DETAILED DESCRIPTION

[0036] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0037] It should be noted that the terms “first” and “second” are used only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with “first” and “second” can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of “plurality” is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0038] In the present application, unless otherwise specifically defined and limited, the terms “mounting”, “connecting”, “fixing” and the like should be understood in a broad sense, for example, can be fixedly connected, can be detachably connected, or can be integrated; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0039] In the present application, unless otherwise explicitly specified and limited, a first feature is "on" or "under" a second feature can mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "over", "above" and "on top of" the second feature can mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. The first feature "under", "below" and "underneath" the second feature can mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0040] In the above description, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples, without contradiction.

[0041] As described in the background, in the existing train wheel assembly, the mounting hole at the rear end of the wheel is only sealed by the felt ring between the rear cover and the axle. When the train is running in a harsh environment (such as when the segment car, muck car, mortar car is running in the shield, and the mine car is running in the mine), the sealing effect of the rear end of the mounting hole is not good. Dirt, sewage, dust and other debris can easily enter the mounting hole through the gap between the rear cover and the wheel or the axle. The debris in the mounting hole mixed with the lubricating medium will cause the lubricating medium to deteriorate. The deteriorated lubricating medium will cause serious wear to the wheel, axle and other components in the mounting hole, causing damage to the train wheel assembly, and the train cannot be used normally. In addition, because the lubricating medium is prone to deterioration, it needs to be replaced frequently. In addition, the lubricating medium in the mounting hole is also prone to leakage, which reduces or fails the lubricating effect, and the leaked lubricating medium also causes environmental pollution.

[0042] To solve the above technical problems, the application provides a train wheel assembly and a train.

[0043] The train wheel assembly and the train provided by the application will be described in detail below in combination with specific embodiments.

[0044] Figure 1 is a schematic diagram of the assembly of the wheel and the axle in an embodiment of the train wheel assembly provided by the application. Figure 1 As shown in the figure, the train wheel assembly provided by the application comprises an axle 100, a wheel 200 and a rear cover 300.

[0045] The center of the rear end of the wheel 200 is provided with a mounting hole 210, and the end of the axle 100 is embedded in the mounting hole 210 and rotationally connected with the wheel 200.

[0046] The rear cover 300 is annular, the rear cover 300 is sleeved outside the axle 100, the axle 100 is gap-fitted with the inner wall of the rear cover 300, the rear cover 300 is tightly connected with the rear end of the wheel 200, and the rear end of the mounting hole 210 is capped by the rear cover 300.

[0047] The rear cover 300 and the axle 100 are provided with a dynamic seal 600 for sealing the gap between the axle 100 and the rear cover 300, and the rear cover 300 and the wheel 200 are provided with a first static seal 700 for sealing the gap between the rear cover 300 and the wheel 200.

[0048] It should be noted that in the application, the direction in which the end of the axle 100 for connecting with the wheel 200 is directed is the front direction. For example, when the two ends of the axle 100 are both connected with the wheel 200, the direction in which the two ends of the axle 100 are directed is the front direction of the wheel 200 installed at the end.

[0049] In the above embodiment, by providing a dynamic seal 600 between the rear cover 300 and the axle 100 to seal the gap between them, the sealing performance between the rear cover 300 and the axle 100 can be improved. Similarly, by providing a first static seal 700 between the rear cover 300 and the wheel 200 to seal the gap between them, the sealing performance between the wheel 200 and the rear cover 300 can be improved. The rear end of the mounting hole 210 has good sealing performance, making it difficult for debris outside the mounting hole 210 to enter it, and also preventing leakage of the lubricating medium within it. The lubricating medium within the mounting hole 210 is less prone to deterioration and leakage, resulting in good lubrication, less wear on the train wheel assembly, and less damage to the train wheel assembly, thus ensuring normal train operation. Furthermore, it reduces the frequency of lubricating medium replacement. Additionally, the risk of environmental pollution caused by lubricating medium leakage is also reduced.

[0050] It is understandable that the mounting hole 210 can be either a blind hole or a through hole. When the mounting hole 210 is a blind hole, the front end of the mounting hole 210 is closed by the bottom of the blind hole; when the mounting hole 210 is a through hole, the front end of the mounting hole 210 is covered by the front cover 400 which is fastened to the front end of the wheel 200.

[0051] In some possible implementations, a resilient retaining ring 900 for limiting the axial movement of the dynamic seal 600 along the rear cover 300 is also installed on the inner wall of the rear cover 300.

[0052] This design prevents the dynamic seal 600 from loosening over time, ensuring that the dynamic seal 600 is in the sealing position, which helps to guarantee the sealing effect between the axle 100 and the inner wall of the rear cover 300.

[0053] Figure 2 This is a cross-sectional view of the axial bisecting plane of the rear cover in an embodiment of the proposed train wheel assembly. Figure 3 This is a schematic diagram of the rear end of the rear cover in an embodiment of the proposed train wheel assembly.

[0054] like Figure 2 , Figure 3 As shown, in some possible embodiments, the inner wall of the rear cover 300 includes a first section 320 and a second section 330 arranged sequentially from front to back along the axial direction of the rear cover 300. The inner diameter of the first section 320 is smaller than the inner diameter of the second section 330. The first section 320 is clearance-fitted with the axle 100. The dynamic seal 600 is installed on the second section 330. The rear end of the first section 320 is used to restrict the forward movement of the dynamic seal 600.

[0055] This design facilitates the installation of the dynamic seal 600.

[0056] In some possible implementation manners, the inner wall of the rear cover 300 further comprises a third section 340 and a fourth section 350 arranged in sequence from front to back along the axial direction of the rear cover 300, the front end of the third section 340 is connected to the rear end of the second section 330, the inner diameter of the second section 330 is smaller than the inner diameter of the third section 340, the inner diameter of the fourth section 350 is greater than the inner diameter of the second section 330 and smaller than the inner diameter of the third section 340, the length of the third section 340 corresponds to the thickness of the hole elastic retainer 900, the hole elastic retainer 900 is installed on the third section 340, the hole elastic retainer 900 is used to limit the rear movement of the dynamic seal 600, and the front end of the fourth section 350 is used to limit the rear movement of the hole elastic retainer 900.

[0057] In this way, when the dynamic seal 600 is installed, the dynamic seal 600 is first installed on the second section 330 by passing through the fourth section 350 and the third section 340 from back to front, and then the hole elastic retainer 900 is installed on the third section 340, thereby facilitating the installation of the dynamic seal 600 and the hole elastic retainer 900.

[0058] In some possible implementation manners, the first section 320 is provided with a communication hole 321 on the end face, the communication hole 321 is in communication with the front of the first section 320 and the inner side space of the second section 330, and the axis of the communication hole 321 is parallel to the axis of the rear cover 300.

[0059] In this way, when the dynamic seal 600 installed on the second section 330 needs to be replaced or removed, a rear force can be applied to the dynamic seal 600 through the communication hole 321, thereby facilitating the removal of the dynamic seal 600 in sealing cooperation with the inner wall of the rear cover 300 and the axle 100.

[0060] In some possible implementation manners, the dynamic seal 600 is a skeleton oil seal.

[0061] In this way, the inner wall of the rear cover 300 and the axle 100 are almost free of gaps after sealing, and the oil and water and the like can be well sealed.

[0062] In some possible implementation manners, the dynamic seal 600 is a three-lip skeleton oil seal.

[0063] In this way, the dynamic seal 600 has a large sealing surface and good sealing effect.

[0064] As shown in FIG. 1, Figures 1-3 In some possible implementation manners, the first static seal 700 is a first sealing ring, the front end of the rear cover 300 is provided with a first sealing groove 360 for installing the first sealing ring, and the first sealing ring installed in the first sealing groove 360 cooperates with the first sealing groove 360 and the rear end of the wheel 200 to seal the gap between the rear cover 300 and the wheel 200.

[0065] In this way, the first sealing ring is pressed by the rear cover 300 and the wheel 200, and can seal the gap between the rear cover 300 and the wheel 200. The first sealing groove 360 facilitates installation of the first sealing ring and can prevent displacement of the first sealing ring.

[0066] It can be understood that the first sealing ring corresponds to the shape of the opening at the rear end of the mounting hole 210. For example, the mounting hole 210 is a circular hole, and the first sealing ring is an O-shaped sealing ring.

[0067] In some possible embodiments, the front end of the rear cover 300 is provided with a first positioning protrusion 310 in the shape of a ring, which is adapted to the rear end of the mounting hole 210 and extends into the mounting hole 210.

[0068] In this way, the rear cover 300 can be quickly installed at the position of the mounting hole 210.

[0069] It can be understood that, after the first positioning protrusion 310 extends into the mounting hole 210, the outer wall of the first positioning protrusion 310 can be in contact with or have a very small gap with the inner wall of the rear end of the mounting hole 210.

[0070] In some possible embodiments, the first sealing groove 360 is arranged at the root of the first positioning protrusion 310, the rear end of the mounting hole 210 is provided with a first chamfer structure 211, the first sealing ring is arranged in the space defined by the first sealing groove 360 and the first chamfer structure 211, and the first sealing ring cooperates with the first sealing groove 360 and the first chamfer structure 211 to seal the gap between the rear cover 300 and the wheel 200.

[0071] In this way, the first sealing ring is arranged in the first sealing groove 360 at the included angle between the root of the first positioning protrusion 310 and the front end of the rear cover 300, the sealing surface is lengthened, the sealing effect between the wheel 200 and the rear cover 300 is improved, and the first sealing ring is kept stable. In addition, the sealing surface between the first chamfer structure 211 and the first sealing ring is large, and the sealing effect between the wheel 200 and the rear cover 300 is improved.

[0072] In some possible embodiments, the mounting hole 210 is a through hole, the front end of the wheel 200 is fixedly connected with a front cover 400 used for covering the front end of the mounting hole 210, and the second static sealing member 800 used for sealing the gap between the front cover 400 and the wheel 200 is arranged between the front cover 400 and the wheel 200.

[0073] In this way, the wheel 200, the axle 100 and the components in the mounting hole 210 are more convenient to disassemble and assemble, and the second sealing member can improve the sealing performance between the front cover 400 and the wheel 200, avoid foreign matters outside the mounting hole 210 from entering the mounting hole 210 through the front end of the mounting hole 210, and avoid the lubricating medium in the mounting hole 210 from leaking through the front end of the mounting hole 210.

[0074] In some possible embodiments, the second sealing member 800 is a second sealing ring, and the rear end of the front cover 400 is provided with a second sealing groove for mounting the second sealing ring.

[0075] In this way, the second sealing ring can seal the gap between the front cover 400 and the wheel 200 after being compressed by the front cover 400 and the wheel 200, the second sealing groove facilitates the mounting of the second sealing ring, and the second sealing ring can also be prevented from being displaced.

[0076] It can be understood that the second sealing ring corresponds to the shape of the opening at the front end of the mounting hole 210. For example, the mounting hole 210 is a circular hole, and the second sealing ring is an O-shaped sealing ring.

[0077] In some possible embodiments, the front cover 400 is provided with an oil cup 420 for injecting the lubricating medium into the mounting hole 210.

[0078] In this way, the lubricating medium can be injected into the mounting hole 210 during daily maintenance.

[0079] It can be understood that the lubricating medium can be grease, lubricating oil or the like as needed.

[0080] In some possible embodiments, the rear end of the front cover 400 is provided with a second positioning protrusion 410 in the shape of a ring, the second positioning protrusion 410 is adapted to the front end of the mounting hole 210, and is used to extend into the mounting hole 210.

[0081] In this way, the front cover 400 can be quickly mounted at the position of the mounting hole 210.

[0082] It can be understood that, after the second positioning protrusion 410 extends into the mounting hole 210, the outer wall of the second positioning protrusion 410 can be in contact with or have a very small gap with the inner wall of the front end of the mounting hole 210.

[0083] In some possible embodiments, the second sealing groove is arranged at the root of the second positioning protrusion 410, the edge of the front end of the mounting hole 210 is a second chamfer structure 212, the second sealing ring is mounted in the space defined by the second sealing groove and the second chamfer structure 212, and the second sealing ring cooperates with the second sealing groove and the second chamfer structure 212 to seal the gap between the front cover 400 and the wheel 200.

[0084] In this way, the second sealing ring is arranged in the second sealing groove at the angle between the root of the second positioning protrusion 410 and the rear end of the front cover 400, the sealing surface is lengthened, the sealing effect between the wheel 200 and the front cover 400 is improved, and the second sealing ring is kept stable. In addition, the sealing surface between the second chamfer structure 212 and the second sealing ring is large, and the sealing effect between the wheel 200 and the rear cover 300 is improved.

[0085] In some possible embodiments, the bearing 500 is arranged in the mounting hole 210, and the axle 100 is rotationally connected to the wheel 200 through the bearing 500.

[0086] In this way, the axle 100 and the wheel 200 are rotationally connected.

[0087] In the embodiment with the bearing 500, the front end of the first positioning protrusion 310 is further used for limiting the rear movement of the bearing 500, and the rear end of the second positioning protrusion 410 is further used for limiting the front movement of the bearing 500.

[0088] In some possible embodiments, the bearing 500 includes an outer ring 540, an inner ring 530, and an end cover 550. The inner ring 530 and the outer ring 540 are rotationally connected, the end cover 550 is fixedly connected to the front end of the inner ring 530, the outer ring 540 is fixedly connected to the hole wall of the mounting hole 210, the end of the axle 100 is embedded in the inner ring 530, at least two first bolts 560 pass through the end cover 550 and are threadedly connected to the front end of the axle 100, and the opposite side walls between the bolt heads of adjacent first bolts 560 are connected through a connecting piece. The connecting piece is used for limiting the relative rotation of the two first bolts 560 connected by the connecting piece.

[0089] In this way, the first bolts 560 connected by the connecting piece are mutually restrained, and the first bolts 560 connecting the front end of the axle 100 and the end cover 550 are prevented from rotating and falling off due to long-term vibration.

[0090] It can be understood that the connecting piece can be a connecting rod, a pull rope, or the like, one end of which is connected to the side wall of the bolt head of one first bolt 560, and the other end of which is connected to the side wall of the bolt head of another first bolt 560.

[0091] In some examples, the connecting piece is a wire 570.

[0092] In this way, the cost is low, and the connection between the first bolts 560 is convenient.

[0093] For example, the side wall of the bolt head of the first bolt 560 is provided with a connecting through hole, the connecting through holes on the bolt heads of two first bolts 560 to be connected by a wire 570 are opposite, the wire 570 passes through the connecting through holes on the two first bolts 560 in turn, and the two ends of the wire 570 are knotted at the ends of the two connecting through holes away from the other first bolt 560 respectively, so as to connect the two first bolts 560.

[0094] In some examples, the inner wall of the mounting hole 210 includes a front section and a rear section arranged from front to rear, the inner diameter of the front section is greater than that of the rear section, and an annular step with an inner diameter smaller than that of the rear section is arranged between the front section and the rear section. The bearing 500 includes coaxially arranged first bearing 510 and second bearing 520, the first bearing 510 is adapted to the front section and arranged in the front section, and the second bearing 520 is adapted to the rear section and arranged in the rear section. The inner ring 530 includes a first inner ring 531 of the first bearing 510 and a second inner ring 532 of the second bearing 520, the outer ring 540 includes a first outer ring 541 of the first bearing 510 and a second outer ring 542 of the second bearing 520, the front end of the annular step is used to abut against the rear end of the first outer ring 541, the rear end of the annular step is used to abut against the front end of the second outer ring 542, the end cover 550 is arranged at the front end of the first inner ring 531, and the end of the axle 100 passes through the second inner ring 532 and the first inner ring 531 in turn and is fastened and connected with the end cover 550 arranged at the front end of the first inner ring 531 through the first bolt 560.

[0095] In some examples, the axle 100 includes a first connecting section 110, a second connecting section 120 and a main body section 130 arranged in sequence from front to rear, the outer diameter of the first connecting section 110 is smaller than that of the second connecting section 120, the outer diameter of the second connecting section 120 is smaller than that of the main body section 130, the first connecting section 110 is located in the first inner ring 531, the front end of the first connecting section 110 is fastened and connected with the end cover 550 through the first bolt 560, the second connecting section 120 passes through the second inner ring 532 and extends to the rear end of the first inner ring 531, the rear cover 300 is clearance-fitted with the main body section 130, the dynamic seal 600 is arranged between the inner wall of the rear cover 300 and the main body section 130 and is used to seal the gap between the inner wall of the rear cover 300 and the main body section 130, and the front end of the main body section 130 is used to abut against the rear end of the second bearing 520 to limit the rear movement of the second bearing 520.

[0096] In some examples, the rear cover 300 and the front cover 400 are fastened and connected with the rear end and the front end of the wheel 200 through fasteners respectively.

[0097] For example, the rear cover 300 and the front cover 400 are respectively provided with a first fastening hole 370 and a second fastening hole, the rear end of the wheel 200 is provided with a first threaded connection hole at a position corresponding to the first fastening hole 370 on the rear cover 300, and the front end of the wheel 200 is provided with a second threaded connection hole at a position corresponding to the second fastening hole on the front cover 400, the first fastening hole 370 is connected with the first threaded connection hole through a second bolt 380 corresponding to the first fastening hole 370, so as to fix the rear cover 300 at the rear end of the wheel 200, and the second fastening hole is connected with the second threaded connection hole through a third bolt 430 corresponding to the second fastening hole, so as to fix the front cover 400 at the front end of the wheel 200.

[0098] The train provided by the embodiment comprises a train body and the train wheel assembly in any of the above embodiments, and the train wheel assembly is installed on the bottom of the train body through the axle of the train wheel assembly.

[0099] In the above embodiment, the rear end of the mounting hole on the wheel has good sealing performance, and foreign matters outside the mounting hole are not easy to enter the mounting hole through the rear end of the mounting hole, and the lubricating medium in the mounting hole is not easy to leak through the rear end of the mounting hole. The lubricating medium in the mounting hole is not easy to deteriorate and leak, the lubricating effect is good, the train wheel assembly is less likely to wear and damage, and the normal use of the train is facilitated. In addition, the frequency of replacing the lubricating medium can also be reduced. In addition, the risk of environmental pollution caused by the leakage of the lubricating medium is also reduced.

[0100] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the above embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A train wheel assembly, characterized by, The axle, the wheel and the rear cover are included; A mounting hole is arranged at the center of the rear end of the wheel, and the end of the axle is embedded into the mounting hole and connected with the wheel in rotation; The rear cover is annular, the rear cover is sleeved outside the axle, the axle is gap-fitted with the inner wall of the rear cover, the rear cover is fastened with the rear end of the wheel, and the rear end of the mounting hole is covered; A dynamic seal is arranged between the rear cover and the axle for sealing the gap between the axle and the rear cover, and a first static seal is arranged between the rear cover and the wheel for sealing the gap between the rear cover and the wheel; An elastic hole retainer is further arranged on the inner wall of the rear cover for limiting the axial movement of the dynamic seal along the rear cover; The inner wall of the rear cover includes a first section, a second section, a third section and a fourth section arranged in sequence from front to back along the axial direction of the rear cover; The inner diameter of the first section is smaller than that of the second section, the inner diameter of the second section is smaller than that of the third section, and the inner diameter of the fourth section is larger than that of the second section and smaller than that of the third section; The first section is gap-fitted with the axle, a communication hole is arranged on the end face of the first section for communicating the front of the first section and the inner side space of the second section, and the axis of the communication hole is parallel to the axis of the rear cover; The dynamic seal is arranged on the second section, and the rear end of the first section is used for limiting the forward movement of the dynamic seal; The length of the third section corresponds to the thickness of the elastic hole retainer, the elastic hole retainer is arranged on the third section, and the elastic hole retainer is used for limiting the rearward movement of the dynamic seal; The front end of the fourth section is used for limiting the rearward movement of the elastic hole retainer; The first static seal is a first sealing ring, and the front end of the rear cover is provided with a first sealing groove for mounting the first sealing ring; The front end of the rear cover is provided with an annular first positioning protrusion, the first positioning protrusion is adapted to the rear end of the mounting hole and is used for extending into the mounting hole, the first sealing groove is arranged at the root of the first positioning protrusion, the edge of the rear end of the mounting hole is a first chamfer structure, the first sealing ring is arranged in the space defined by the first sealing groove and the first chamfer structure, and the first sealing ring is matched with the first sealing groove and the first chamfer structure to seal the gap between the rear cover and the wheel.

2. The train wheel assembly of claim 1, wherein, The dynamic seal is a skeleton oil seal.

3. The train wheel assembly of claim 2, wherein, The dynamic seal is a three-lip skeleton oil seal.

4. The train wheel assembly of claim 1, wherein, The mounting hole is a through hole, the front end of the wheel is fastened with a front cover for covering the front end of the mounting hole, and a second static seal is arranged between the front cover and the wheel for sealing the gap between the front cover and the wheel; An oil cup is arranged on the front cover for injecting lubricating medium into the mounting hole.

5. The train wheel assembly of claim 4, wherein, The second static seal is a second sealing ring, and the rear end of the front cover is provided with a second sealing groove for mounting the second sealing ring; The rear end of the front cover is provided with a ring-shaped second positioning protrusion, which is adapted to the front end of the mounting hole for extending into the mounting hole, the second sealing groove is arranged at the root of the second positioning protrusion, the edge of the front end of the mounting hole is a second chamfer structure, the second sealing ring is installed in the space defined by the second sealing groove and the second chamfer structure, and the second sealing ring cooperates with the second sealing groove and the second chamfer structure to seal the gap between the front cover and the wheel.

6. The train wheel assembly of claim 1, wherein, A bearing is arranged in the mounting hole, and the axle is rotationally connected with the wheel through the bearing. The bearing comprises an outer ring, an inner ring and an end cover, the inner ring is rotationally connected with the outer ring, the end cover is fixedly connected with the front end of the inner ring, the outer ring is fixedly connected with the hole wall of the mounting hole, the end of the axle is embedded in the inner ring, at least two first bolts are screwed with the front end of the axle after penetrating through the end cover, the opposite side walls of the bolt heads of the adjacent first bolts are connected through a connecting piece, and the connecting piece is used to limit the relative rotation of the two first bolts connected therewith.

7. The train wheel assembly of claim 6, wherein, The connecting piece is a wire.

8. A train characterized by The train wheel assembly is installed on the bottom of the train body through the axle of the train wheel assembly.

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