Bearing box, rail transit vehicle and lubricating grease replacement method of bearing box

Abstract

The invention discloses a bearing box, a rail transit vehicle and a lubricating grease replacement method of the bearing box, and relates to the technical field of rail transit vehicles. The bearing box comprises a bearing body internally provided with an oil injection cavity, a front sealing slip ring and a rear sealing slip ring which are detachably and fixedly arranged at the two ends of a bearing outer ring of the bearing body respectively, and an oil discharge plug which is detachably and fixedly arranged in an oil discharge hole of the rear sealing slip ring; the oil discharge hole is communicated with the oil injection cavity; when the front sealing slip ring and the oil discharge plug are detached, the oil injection cavity and the oil discharge hole are both communicated with the outside. According to the invention, the lubricating grease in the bearing body can be replaced only by dismounting the front sealing slip ring and the oil discharge plug, the whole oil replacement process does not need to decompose a bogie, the integrated operation of old grease cleaning and new grease injection is realized, time and labor are saved, and the oil replacement time is effectively shortened, so that the maintenance period of the bearing box is shortened.

Description

Technical Field

[0001] The present invention relates to rail transit vehicles, and particularly to a bearing box and a rail transit vehicle. The present invention also relates to a method for replacing the grease in the bearing box. Background Art

[0002] The bearing box of a rail transit vehicle is an important component connecting the wheel set and the bogie. An axle box bearing is installed on the axle in the bearing box. The function of the axle box bearing is to support the rotation of the wheel set and at the same time bear various loads from the car body and the track. Therefore, the quality and performance of the axle box bearing directly affect the safety performance and service life of the rail transit vehicle.

[0003] During the operation of a rail transit vehicle, the axle box bearing needs to bear a high-strength radial load generated by the self-weight of the car body and the vertical impact of the track, as well as an alternating axial load generated by the lateral centrifugal force during curve passing and the longitudinal inertial force generated by braking / acceleration. For this reason, a cylindrical roller bearing or a tapered roller bearing is usually selected. Among them, the cylindrical roller bearing can disperse the radial load by virtue of the raceway with line contact, and the tapered roller bearing can synchronously bear the radial and axial composite loads by virtue of the inclination structure. To reduce the friction coefficient between the rolling elements such as cylindrical rollers or tapered rollers and the raceway, grease is usually injected into the axle box bearing.

[0004] However, under the multiple actions of high temperature, high pressure and mechanical shear for a long time, the grease will gradually undergo physical and chemical property degradation such as base oil precipitation and thickener structure collapse, resulting in attenuation of lubrication performance. In severe cases, it may even cause abnormal temperature rise of the axle box bearing, which restricts the maintenance cycle of the rail transit vehicle to a certain extent. To solve this problem, it is necessary to regularly disassemble the axle box bearing to replace the grease. Since the axle box bearing is generally provided with a sealing structure inside, when replacing the grease, it is necessary to completely remove the sealing structure and disassemble the bogie to expose the axle box bearing. The whole replacement step is relatively cumbersome, resulting in a longer maintenance cycle of the axle box bearing.

[0005] Therefore, how to shorten the maintenance cycle of the axle box bearing is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a bearing box, which only needs to remove the front sealing slip ring and the drain plug to realize the integrated operation of old grease cleaning and new grease injection, and solves the technical problem that the existing bearing box has an excessively long maintenance cycle due to the cumbersome grease replacement steps. Another purpose of the present invention is to provide a rail transit vehicle and a method for replacing the grease in the bearing box.

[0007] To achieve the above purpose, the present invention provides a bearing box, comprising:

[0008] A bearing body with an oil injection cavity formed inside;

[0009] A front sealing slip ring and a rear sealing slip ring that are respectively detachably fixed to both ends of the bearing outer ring of the bearing body;

[0010] An oil drain plug detachably fixed to the oil drain hole of the rear sealing slip ring;

[0011] The oil drain hole is connected to the oil injection cavity; when the front sealing slip ring and the oil drain plug are removed, both the oil injection cavity and the oil drain hole are connected to the outside.

[0012] In some embodiments, it further includes:

[0013] An upper box body and a lower box body that are detachably connected and form an installation cavity;

[0014] A front cover and a rear cover that are respectively detachably fixed to both ends of the installation cavity and respectively abut against the front sealing slip ring and the rear sealing slip ring correspondingly;

[0015] The bearing outer ring has a grease injection hole and a grease outlet hole connected to the oil injection cavity; the upper box body is provided with an oil guiding hole, the oil guiding hole is penetrated and connected to the grease injection hole, and a grease injection plug is detachably provided at one end of the oil guiding hole away from the grease injection hole; a grease outlet plug is detachably provided at the grease outlet hole;

[0016] Wherein, the bearing body is installed in the installation cavity;

[0017] After removing the lower box body and the grease outlet plug, the grease outlet hole is connected to the outside;

[0018] After removing the front cover and the rear cover, remove the front sealing slip ring and the oil drain plug.

[0019] In some embodiments, the bearing body further includes a bearing inner ring sleeved on the journal of the axle, and further includes a rear retaining ring fixedly sleeved on the journal and abutting against the rear end of the bearing inner ring. At least one set of sealing teeth and sealing grooves that cooperate with each other in the radial direction of the bearing body are formed between the opposite surfaces of the rear retaining ring and the rear cover; the rear cover includes an upper rear cover and a lower rear cover distributed up and down.

[0020] In some embodiments, it further includes a rear sealing ring arranged between the rear sealing slip ring and the rear retaining ring; one end of the rear sealing ring facing the bearing body is provided with a limiting groove and an L-shaped retaining strip extending along the axial direction of the bearing body. Both sides of the L-shaped retaining strip respectively abut against the rear end of the bearing outer ring and the rear extension ring of the rear sealing slip ring correspondingly, and the limiting groove abuts against the bearing inner ring.

[0021] In some embodiments, a folded line gap is formed between the contact surfaces of the rear sealing ring and the rear sealing slip ring; a stepped protrusion is formed on one side of the rear sealing ring facing the rear retaining ring, and a stepped groove is formed on the rear retaining ring. The stepped protrusion cooperates with the stepped groove along the axial direction of the bearing body;

[0022] On one side of the rear sealing ring facing the inner ring of the bearing, a sealing flange is formed, and the sealing flange abuts between the rear end of the inner ring of the bearing and the rear retaining ring.

[0023] In some embodiments, at the rear ends of both the upper housing and the lower housing, a limiting convex ring extending along the axial direction of the bearing body is integrally formed, and at one end of the rear retaining cover facing the bearing body, an extending convex ring extending along the axial direction of the bearing body is integrally formed. The limiting convex ring and the extending convex ring are engaged with each other in a concave-convex manner along the radial direction of the bearing body.

[0024] In some embodiments, on one side of the rear retaining cover facing the bearing body, a stop step is integrally provided, and the stop step abuts against the rear sealing sliding ring along the axial direction of the bearing body.

[0025] In some embodiments, the front ends of both the upper housing and the lower housing respectively abut against the end face of the front retaining cover; on one side of the front retaining cover facing the bearing body, a limiting pressure ring is integrally formed, and the limiting pressure ring abuts against the front sealing sliding ring along the axial direction of the bearing body.

[0026] In some embodiments, it further includes:

[0027] An end cap that is detachably fixed to the end of the journal;

[0028] An oil retaining ring that is pressed between the inner ring of the bearing and the end cap;

[0029] A front sealing ring provided between the front sealing sliding ring and the oil retaining ring.

[0030] In some embodiments, at one end of the front sealing ring facing the bearing body, an extending stop strip extending along the axial direction of the bearing body is provided, and both sides of the extending stop strip respectively abut against the front end of the outer ring of the bearing and the front extending ring of the front sealing sliding ring correspondingly;

[0031] A broken-line gap is formed between the contact surfaces of the front sealing ring and the front sealing sliding ring;

[0032] On one side of the front sealing ring facing the inner ring of the bearing, a sealing lip ring is formed, and the sealing lip ring abuts between the front end of the inner ring of the bearing and the oil retaining ring.

[0033] In some embodiments, the front sealing sliding ring forms a front extending ring, and the front extending ring and the rear extending ring are respectively threadedly connected to both ends of the outer ring of the bearing.

[0034] The present invention further provides a rail transit vehicle, including a wheel set assembly, a bogie, and the above-mentioned bearing housing, and the bearing housing is connected between the wheel set assembly and the bogie.

[0035] The present invention also provides a method for replacing the grease of the bearing housing, which is applied to the above-mentioned bearing housing, and includes:

[0036] After removing the lower housing, the grease outlet holes provided on the outer ring of the bearing are exposed;

[0037] Remove the grease outlet plug installed at the grease outlet hole;

[0038] Remove the front cover and the rear cover from both ends of the bearing body respectively;

[0039] After removing the drain plugs provided at the front sealing slip ring and the rear sealing slip ring from both ends of the bearing body respectively, rotate the bearing body and scrape the waste grease flowing out from both ends of the bearing body;

[0040] Inject the cleaning agent with a set pressure into the oil injection cavity of the bearing body from the front end of the bearing body, and the residual grease in the oil injection cavity is discharged from the drain hole provided at the rear sealing slip ring after being diluted;

[0041] After the waste grease in the oil injection cavity is completely discharged, install the grease outlet plug;

[0042] Inject clean grease into the oil injection cavity from the front end and the drain hole of the bearing body respectively;

[0043] Remove the grease injection plug provided at the oil transmission hole of the upper housing body, and inject clean grease into the grease injection hole installed on the outer ring of the bearing through the oil transmission hole;

[0044] After the oil injection cavity is filled with clean grease, install the grease injection plug, the drain plug, the front sealing slip ring, the front cover, the rear cover and the lower housing body in sequence.

[0045] Compared with the background technology, the present invention optimizes the structure of the bearing housing. The optimized bearing housing includes a bearing body, a front sealing slip ring, a rear sealing slip ring and a drain plug. An oil injection cavity is formed inside the bearing body. The front sealing slip ring and the rear sealing slip ring are respectively detachably fixed at both ends of the outer ring of the bearing body. The front cover and the rear cover are detachably arranged and respectively abut against both ends of the bearing body. The drain plug is detachably fixed at the drain hole of the rear sealing slip ring, and the drain hole is communicated with the oil injection cavity.

[0046] When draining the oil, first remove the front sealing slip ring and the drain plug to ensure that both the oil cavity and the drain hole are connected to the outside, and rotate the bearing body to make the waste grease in the oil injection cavity flow to both ends of the bearing body, and scrape the waste grease from both ends of the bearing body; then inject the cleaning agent with a certain pressure into the oil injection cavity. The cleaning agent dilutes the residual grease in the oil injection cavity. After cleaning, the cleaning agent carries the residual grease and discharges it out of the bearing body through the drain hole, so that the waste grease in the bearing body is completely discharged. When injecting oil, it is only necessary to inject clean grease from the front end and the drain hole of the bearing body respectively, and finally install the front sealing slip ring and the drain plug in sequence.

[0047] The present invention only needs to remove the front sealing slip ring and the drain plug to replace the grease in the bearing body. During the whole oil change process, there is no need to disassemble the bogie, realizing the integrated operation of old grease cleaning and new grease injection, saving time and effort, effectively shortening the oil change time, and thus shortening the maintenance period of the bearing housing. Brief Description of the Drawings

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0049] Figure 1 A cross-sectional view of the bearing housing provided by a specific embodiment of the present invention;

[0050] Figure 2 For Figure 1 A cross-sectional view of the remaining components after removing the grease injection plug, oil drain plug, front sealing slip ring, front retaining cover, rear retaining cover and lower housing in

[0051] Figure 3 For Figure 1 A structural diagram of the upper housing and the lower housing in

[0052] Figure 4 For Figure 1 A schematic diagram of the rear retaining cover in

[0053] Figure 5 A state diagram of the bearing housing provided by a specific embodiment of the present invention when removing waste lubricating grease;

[0054] Figure 6 A state diagram of the bearing housing provided by a specific embodiment of the present invention when injecting clean lubricating grease.

[0055] The reference numerals are as follows:

[0056] Bearing body 10, front sealing slip ring 11, rear sealing slip ring 12, oil drain plug 13, upper housing 14, lower housing 15, front retaining cover 16, rear retaining cover 17, axle 18, rear retaining ring 19, rear sealing ring 20, limit convex ring 21, shaft end gland 22, oil baffle ring 23 and front sealing ring 24;

[0057] Grease injection cavity 101, bearing outer ring 102 and bearing inner ring 103;

[0058] Grease injection hole 1021 and grease outlet hole 1022;

[0059] Front extension ring 111;

[0060] Rear extension ring 121;

[0061] Upper rear cover 151 and lower rear cover 152;

[0062] Limit pressing ring 161;

[0063] Sealing groove 171, extending convex ring 172 and stop step 173;

[0064] Sealing teeth 191 and stepped groove 192;

[0065] Position-limiting groove 201, L-shaped bar 202, stepped protrusion 203 and sealing flange 204;

[0066] Extending bar 241 and sealing lip ring 242. Detailed implementation mode

[0067] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0068] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0069] First of all, it should be noted that taking the current view of the attached Figure 1 drawing as an example, the orientation term "front" in the text refers to the outer side of the bearing body 10. For a conventional external axlebox system, specifically, it refers to the side away from the wheel. The orientation term "rear" in the text refers to the inner side of the bearing body 10. For a conventional external axlebox system, specifically, it refers to the side close to the wheel.

[0070] An embodiment of the present invention discloses a bearing housing, as shown in the attached Figure 1 drawing, which includes a bearing body 10, a front sealing slip ring 11, a rear sealing slip ring 12 and an oil drain plug 13. Among them, the bearing body 10 is sleeved on the journal of the axle 18 for the axle 18 to rotate relative to the bogie. An oil injection cavity 101 is formed inside the bearing body 10 for storing lubricating grease. In this specific embodiment, the bearing body 10 is preferably a tapered roller bearing, specifically including a bearing inner ring 103, a bearing outer ring 102 coaxially sleeved on the outer periphery of the bearing inner ring 103, and inner row rollers and outer row rollers arranged in parallel between the bearing inner ring 103 and the bearing outer ring 102. Among them, the oil injection cavity 101 refers to the cavity formed between the bearing inner ring 103 and the bearing outer ring 102, including the annular gap between the inner row rollers and the outer row rollers and the gap between adjacent rollers. Of course, the type of the bearing body 10 is not limited to this. For example, it can also be a cylindrical roller bearing.

[0071] The front sealing slip ring 11 and the rear sealing slip ring 12 are respectively detachably fixed at both ends of the bearing outer ring 102 of the bearing body 10. The rear sealing slip ring 12 is provided with an oil drain hole which is communicated with the oil injection cavity 101, and the oil drain plug 13 is detachably fixed at the oil drain hole. When the front sealing slip ring 11 and the oil drain plug 13 are removed, both the oil injection cavity 101 and the oil drain hole are communicated with the outside, which is convenient for oil injection and oil drainage. That is to say, when replacing the grease, only the front sealing slip ring 11 and the oil drain plug 13 need to be removed, and there is no need to remove the rear sealing slip ring 12, which simplifies the disassembly and assembly steps and shortens the grease replacement time.

[0072] Considering that the bearing outer ring 102 is fixed and the rear sealing slip ring 12 is fixed at the end of the bearing outer ring 102, the rear sealing slip ring 12 also remains fixed. To ensure that the waste grease is completely discharged, the oil drain hole is arranged at the lowest part of the rear sealing slip ring 12, that is, on the side close to the lower box body 15, so that the diluted grease can smoothly flow out of the oil drain hole from top to bottom.

[0073] When draining the oil, first remove the front sealing slip ring 11 and the oil drain plug 13 to ensure that both the oil cavity and the oil drain hole are communicated with the outside, and rotate the bearing body 10 to make the waste grease in the oil injection cavity 101 flow to both ends of the bearing body 10, and scrape the waste grease from both ends of the bearing body 10; then inject a cleaning agent with a certain pressure into the oil injection cavity 101. The cleaning agent dilutes the residual grease in the oil injection cavity 101. After cleaning, the cleaning agent carries the residual grease and discharges it out of the bearing body 10 through the oil drain hole, so that the waste grease in the bearing body 10 is completely discharged. When injecting oil, only need to inject clean grease into the bearing body 10 from the front end and the oil drain hole respectively, and finally install the front sealing slip ring 11 and the oil drain plug 13 in sequence, as shown in the appendix Figure 2 shown.

[0074] In the present invention, only the front sealing slip ring 11 and the oil drain plug 13 need to be removed to replace the grease in the bearing body 10. During the whole oil change process, there is no need to disassemble the bogie, realizing the integrated operation of old grease cleaning and new grease injection, saving time and effort, effectively shortening the oil change time, and thus shortening the maintenance cycle of the bearing box.

[0075] The bearing housing further includes an upper housing body 14, a lower housing body 15, a front cover 16 and a rear cover 17. Among them, the upper housing body 14 and the lower housing body 15 are detachably connected, which can not only provide effective protection for the bearing body 10, but also be conveniently disassembled and assembled when replacing the grease. The upper housing body 14 and the lower housing body 15 are buckled to form an installation cavity, and the bearing body 10 is installed in the installation cavity. As a preferred embodiment, the upper housing body 14 and the lower housing body 15 are distributed up and down. The upper housing body 14 is integrally provided with an upper semi-circular cover, and the lower housing body 15 is integrally provided with a lower semi-circular cover. The upper semi-circular cover and the lower semi-circular cover are buckled with each other to form an installation cavity. On two opposite sides of the open end of the upper semi-circular cover, there are parallel upper connecting ears, and on two opposite sides of the open end of the lower semi-circular cover, there are parallel lower connecting ears. The upper connecting ears and the lower connecting ears are in contact with each other and are detachably connected by a plurality of bolts.

[0076] The front cover 16 and the rear cover 17 are respectively detachably fixed at both ends of the installation cavity. The front cover 16 abuts against the front sealing slip ring 11, and the rear cover 17 abuts against the rear sealing slip ring 12, which can not only improve the sealing performance of the bearing body 10 by pressing the front sealing slip ring 11 and the rear sealing slip ring 12, but also be convenient for disassembly and assembly when replacing the grease. After removing the front cover 16 and the rear cover 17, the front sealing slip ring 11 and the drain plug 13 are removed; after removing the front sealing slip ring 11, an annular gap is formed at the front end of the bearing body 10, and the front end of the grease injection cavity 101 is connected to the outside through the annular gap, so that the waste grease can be discharged or the clean grease can be injected through the annular gap. After removing the drain plug 13, the rear end of the grease injection cavity 101 is connected to the outside through the grease injection hole, so that the waste grease can be discharged or the clean grease can be injected through the drain hole.

[0077] As a preferred embodiment, as shown in the appendix Figure 3 The front cover 16 is respectively fixed to the front ends of both the upper housing body 14 and the lower housing body 15 by bolts, and the rear cover 17 is respectively fixed to the rear ends of both the upper housing body 14 and the lower housing body 15 by bolts.

[0078] The outer bearing ring 102 has a grease injection hole 1021 and a grease outlet hole 1022 that penetrate radially through the bearing body 10. Both the grease injection hole 1021 and the grease outlet hole 1022 are connected to the grease injection cavity 101. The grease injection hole 1021 is used to inject clean grease into the grease injection cavity 101, and the grease outlet hole 1022 is used to discharge the waste grease from the grease injection cavity 101. The upper housing 14 is provided with a through oil guiding hole. One end of the oil guiding hole can be connected to a grease gun, and the other end is in through communication with the grease injection hole 1021. A detachable grease plug is provided at the end of the oil guiding hole away from the grease injection hole 1021. After removing the grease plug, the grease gun injects clean grease into the grease injection cavity 101 through the oil guiding hole and the grease injection hole 1021 in sequence; that is to say, when injecting clean grease into the grease injection hole 1021, it is not necessary to disassemble the upper housing 14, which further simplifies the disassembly and assembly steps and shortens the grease replacement time. After removing the lower housing 15 and the grease outlet plug, the grease injection cavity 101 is connected to the outside through the grease outlet hole 1022, and the waste grease in the grease injection cavity 101 is discharged through the grease outlet hole 1022.

[0079] As a preferred embodiment, the grease injection hole 1021 and the grease outlet hole 1022 are distributed at 180 degrees, and both the grease injection hole 1021 and the grease outlet hole 1022 are radially aligned with the annular gap between the inner row of rollers and the outer row of rollers along the bearing body 10.

[0080] Process for removing waste grease: First, remove the lower housing 15, then remove the grease outlet plug, and the grease outlet hole 1022 of the outer bearing ring 102 is exposed; then, remove the front cover 16 and the rear cover 17, then remove the front sealing slip ring 11 and the drain plug 13, rotate the bearing body 10, and scrape the waste grease flowing out from both ends of the bearing body 10; then, inject a cleaning agent with a set pressure into the grease injection cavity 101 from the front end of the bearing body 10, and the residual grease in the grease injection cavity 101 is discharged through the drain hole after being diluted; after the waste grease in the grease injection cavity 101 is completely discharged, install the grease outlet plug, as shown in the appendix Figure 5 as shown.

[0081] Process for injecting clean grease: First, inject clean grease into the grease injection cavity 101 from the front end and the drain hole of the bearing body 10; then, remove the grease plug on the upper housing 14, and inject clean grease into the grease injection hole 1021 through the oil delivery hole; after the grease injection cavity 101 is filled with clean grease, then install the grease plug, the drain plug 13, the front sealing slip ring 11, the front cover 16, the rear cover 17 and the lower housing 15 in sequence, as shown in the appendix Figure 6 as shown.

[0082] The bearing body 10 further includes a bearing inner ring 103 sleeved on the journal of the axle 18. The bearing housing further includes a rear retaining ring 19 fixedly sleeved on the journal and abutted against the rear end of the bearing inner ring 103. Both the rear retaining ring 19 and the bearing inner ring 103 rotate synchronously with the axle 18. At least one set of sealing teeth 191 and sealing grooves 171 that cooperate with each other radially along the bearing body 10 are formed between the opposite surfaces of the rear retaining ring 19 and the rear cover 17, forming a labyrinth seal to improve the sealing effect of the bearing housing. Considering that the rear cover 17 adopts a labyrinth seal, the rear cover 17 adopts a split structure. The rear cover 17 includes an upper rear cover 151 and a lower rear cover 152 that are distributed vertically, as shown in the appendix Figure 4 shown, which facilitates the disassembly and assembly of the rear cover 17, reduces the disassembly and assembly difficulty, and is beneficial to shortening the replacement time of the grease. Specifically, a set of sealing teeth 191 and sealing grooves 171 are specifically provided between the rear retaining ring 19 and the rear cover 17. The sealing teeth 191 are provided on the outer side surface of the rear retaining ring 19, and the sealing grooves 171 are provided on the inner side surface of the rear cover 17. Of course, swapping the installation positions of the sealing teeth 191 and the sealing grooves 171 or changing the installation quantity of the two does not affect the achievement of the purpose of the present invention.

[0083] The bearing housing further includes a rear sealing ring 20 provided between the rear sealing slip ring 12 and the rear retaining ring 19. The rear sealing ring 20 abuts against the rear sealing slip ring 12, the rear cover 17, the rear retaining ring 19 and the bearing inner ring 103 respectively, improving the sealing performance at the rear end of the bearing body 10.

[0084] As a preferred embodiment, one end of the rear sealing ring 20 facing the bearing body 10 is provided with a limiting groove 201 and an L-shaped retaining strip 202 extending along the axial direction of the bearing body 10. The two sides of the L-shaped retaining strip 202 respectively abut against the rear end of the bearing outer ring 102 and the rear extension ring 121 of the rear sealing slip ring 12, and the limiting groove 201 abuts against the bearing inner ring 103, ensuring good sealing performance between the rear sealing slip ring 12 and the bearing inner ring 103.

[0085] A folded line gap is formed between the contact surfaces of the rear sealing ring 20 and the rear sealing slip ring 12, reserving space for the expansion and contraction of the rear sealing ring 20. A stepped protrusion 203 is formed on one side of the rear sealing ring 20 facing the rear retaining ring 19, and a stepped groove 192 is formed on the rear retaining ring 19. The stepped protrusion 203 is axially matched with the stepped groove 192 along the bearing body 10, ensuring good sealing performance between the rear sealing ring 20 and the rear retaining ring 19. A sealing flange 204 is formed on one side of the rear sealing ring 20 facing the bearing inner ring 103, and the sealing flange 204 abuts between the rear end of the bearing inner ring 103 and the rear retaining ring 19, improving the sealing performance between the bearing inner ring 103 and the rear retaining ring 19.

[0086] At the rear ends of both the upper housing body 14 and the lower housing body 15, a limit convex ring 21 extending along the axial direction of the bearing body 10 is integrally formed. At one end of the rear retaining cover 17 facing the bearing body 10, an extension convex ring 172 extending along the axial direction of the bearing body 10 is integrally formed. The extension convex ring 172 is sleeved outside the limit convex ring 21, and the limit convex ring 21 and the extension convex ring 172 are in concave-convex engagement along the radial direction of the bearing body 10, for radially limiting the position of the rear retaining cover 17 to ensure that the rear retaining cover 17 is firmly fixed. In addition, the outer side surfaces surrounded by the upper housing body 14 and the lower housing body 15 are flush with the outer side surface of the rear retaining cover 17.

[0087] On one side of the rear retaining cover 17 facing the bearing body 10, a stop step 173 is integrally provided. The stop step 173 abuts against the rear sealing slip ring 12 along the axial direction of the bearing body 10, so that the rear retaining cover 17 limits the position of the rear end of the bearing body 10 through the rear sealing slip ring 12, reducing the risk of axial movement of the bearing body 10 during the rotation of the wheel, which is beneficial to extending the service life of the bearing body 10.

[0088] The front ends of the upper housing body 14 and the lower housing body 15 respectively abut against the end surface of the front retaining cover 16, so that the front retaining cover 16 limits the position of the front end of the bearing body 10 through the front sealing slip ring 11, and cooperates with the rear retaining ring 19 to jointly limit the axial movement of the bearing body 10, preventing the bearing body 10 from being severely damaged and effectively extending the service life of the bearing body 10. As a preferred embodiment, the front retaining cover 16 is fixed to the front ends of the upper housing body 14 and the lower housing body 15 by bolts.

[0089] As a preferred embodiment, on one side of the front retaining cover 16 facing the bearing body 10, a limit pressing ring 161 is integrally formed. The limit pressing ring 161 abuts against the front sealing slip ring 11 along the axial direction of the bearing body 10, so that the front retaining cover 16 presses the front sealing slip ring 11 along the axial direction of the bearing body 10 by means of the limit pressing ring 161, reducing the risk of loosening of the front sealing slip ring 11 and avoiding axial movement of the bearing body 10 due to this.

[0090] The bearing housing further includes a shaft end gland 22, an oil retaining ring 23 and a front sealing ring 24. The shaft end gland 22 is detachably fixed to the shaft neck end of the axle 18. Specifically, the shaft end gland 22 is fixed to the end of the shaft neck by bolts. The oil retaining ring 23 is pressed between the inner ring 103 of the bearing and the shaft end gland 22, for preventing the lubricating grease in the bearing body 10 from flowing out between the inner ring 103 of the bearing and the shaft end gland 22. One side of the oil retaining ring 23 is provided with an L-shaped groove, and the other side directly abuts against the front end of the inner ring 103 of the bearing. The L-shaped groove abuts against the shaft end gland 22. The oil retaining ring 23 is in interference fit between the shaft end gland 22 and the inner ring 103 of the bearing. The front sealing ring 24 is arranged between the front sealing slip ring 11 and the oil retaining ring 23. The front sealing ring 24 abuts against the front sealing slip ring 11, the oil retaining ring 23 and the inner ring 103 of the bearing respectively, improving the sealing performance at the front end of the bearing body 10.

[0091] It should be noted that the shaft end gland 22, the oil baffle ring 23, the rear retaining ring 19, the rear sealing ring 20 and the inner bearing ring 103 rotate synchronously with the axle 18, while the front sealing slip ring 11, the front sealing ring 24, the rear sealing slip ring 12 and the outer bearing ring 102 all remain stationary.

[0092] As a preferred embodiment, one end of the front sealing ring 24 facing the bearing body 10 is provided with an extension bar 241 extending along the axial direction of the bearing body 10. The two sides of the extension bar 241 respectively abut against the front end of the outer bearing ring 102 and the front extension ring 111 of the front sealing slip ring 11, covering the gap between the oil injection cavity 101 and the front sealing slip ring 11 to ensure good sealing between the front sealing slip ring 11 and the outer bearing ring 102. A folded line gap is formed between the contact surfaces of the front sealing ring 24 and the front sealing slip ring 11, reserving space for the expansion and contraction of the front sealing ring 24. A sealing lip ring 242 is formed on one side of the front sealing ring 24 facing the inner bearing ring 103, and the sealing lip ring 242 abuts between the front end of the inner bearing ring 103 and the oil baffle ring 23 to ensure good sealing between the front end of the inner bearing ring 103 and the oil baffle ring 23.

[0093] As a preferred embodiment, the front sealing slip ring 11 is formed with a front extension ring 111, and the front extension ring 111 extends from the front end of the outer bearing ring 102 into the outer bearing ring 102. The rear extension ring 121 of the rear sealing slip ring 12 extends from the rear end of the outer bearing ring 102 into the outer bearing ring 102. The front extension ring 111 and the rear extension ring 121 are respectively threadedly connected to the two ends of the outer bearing ring 102, which can not only increase the contact area between the front sealing slip ring 11 and the rear sealing slip ring 12 and the outer bearing ring 102, improve the connection strength, but also facilitate the disassembly and assembly of the front sealing slip ring 11 and the rear sealing slip ring 12.

[0094] The embodiment of the present invention also discloses a rail transit vehicle, including a wheel set assembly, a bogie and the above-mentioned bearing housing, and the bearing housing is connected between the wheel set assembly and the bogie. The structure of the bearing housing is optimized to shorten its maintenance cycle, thereby improving the operation efficiency of the rail transit vehicle.

[0095] The embodiment of the present invention also discloses a method for replacing the grease of the bearing housing, which is applied to the above-mentioned bearing housing and includes:

[0096] After removing the lower housing 15, the grease outlet hole 1022 provided on the outer bearing ring 102 is exposed;

[0097] Remove the grease outlet plug installed on the grease outlet hole 1022;

[0098] Remove the front cover 16 and the rear cover 17 from both ends of the bearing body 10 respectively;

[0099] After removing the drain plugs 13 provided on the front sealing slip ring 11 and the rear sealing slip ring 12 respectively from both ends of the bearing body 10, rotate the bearing body 10 to scrape the waste grease flowing out from both ends of the bearing body 10;

[0100] Inject the cleaning agent with a set pressure into the grease injection cavity 101 of the bearing body 10 from the front end of the bearing body 10, and the residual grease in the grease injection cavity 101 is discharged through the drain hole provided on the rear sealing slip ring 12 after being diluted;

[0101] After the waste grease in the grease injection cavity 101 is completely discharged, install the grease outlet plug;

[0102] Inject clean grease into the grease injection cavity 101 respectively from the front end and the drain hole of the bearing body 10;

[0103] Remove the grease injection plug provided on the oil delivery hole of the upper housing 14, and inject clean grease into the grease injection hole 1021 installed on the outer bearing ring 102 through the oil delivery hole;

[0104] After the grease injection cavity 101 is filled with clean grease, install the grease injection plug, the drain plug 13, the front sealing slip ring 11, the front cover 16, the rear cover 17 and the lower housing 15 in sequence.

[0105] The present invention only needs to remove the lower housing 15, the rear cover 17, the front cover 16, the front sealing slip ring 11, the drain plug 13 and the grease injection plug, then the grease in the bearing body 10 can be replaced. The whole oil change process realizes the integrated operation of old grease cleaning and new grease injection, without disassembling the bogie, effectively shortening the maintenance cycle of the bearing box.

[0106] It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0107] Specific examples are applied in this article to elaborate the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A bearing box, characterized in that: include: A bearing body (10) having an oil injection cavity (101) formed therein; A front sealing slip ring (11) and a rear sealing slip ring (12) respectively and detachably fixed to two ends of a bearing outer ring (102) of the bearing body (10); An oil drain plug (13) detachably fixed to the oil drain hole of the rear sealing sliding ring (12); The oil drain hole is in communication with the oil filling chamber (101); when the front sealing slide ring (11) and the oil drain plug (13) are removed, the oil filling chamber (101) and the oil drain hole are both in communication with the outside.

2. The bearing box according to claim 1, characterized in that: Also includes: An upper box body (14) and an upper box body (15) which are detachably connected and form a mounting cavity; A front stopper (16) and a rear stopper (17) which are detachably fixed to the two ends of the installation cavity and respectively abut against the front sealing slip ring (11) and the rear sealing slip ring (12); The bearing outer ring (102) has a grease injection hole (1021) and a grease outlet hole (1022) which are connected to the oil injection cavity (101); the upper housing (14) is provided with an oil guide hole, the oil guide hole is connected to the grease injection hole (1021), and one end of the oil guide hole away from the grease injection hole (1021) is detachably provided with a grease injection plug; the grease outlet hole (1022) is detachably provided with a grease outlet plug; Wherein, the bearing body (10) is installed in the installation cavity; After the upper box body (15) and the grease outlet plug are removed, the grease outlet hole (1022) is connected to the outside; After removing the front cover (16) and the rear cover (17), remove the front sealing slide ring (11) and the oil drain plug (13).

3. The bearing box according to claim 2, characterized in that: The bearing body (10) further comprises a bearing inner ring (103) sleeved on the journal of the axle (18), and a rear retaining ring (19) fixedly sleeved on the journal and abutting against the rear end of the bearing inner ring (103); at least one set of sealing teeth (191) and sealing grooves (171) which cooperate with each other in the radial direction of the bearing body (10) are formed between the opposing surfaces of the rear retaining ring (19) and the rear retaining cover (17); the rear retaining cover (17) comprises an upper rear cover (151) and a lower rear cover (152) which are arranged in an upper and lower manner.

4. The bearing box according to claim 3, characterized in that: The invention also comprises a rear sealing ring (20) arranged between the rear sealing sliding ring (12) and the rear retaining ring (19); a limiting groove (201) and an L-shaped retaining strip (202) extending axially along the bearing body (10) are provided at one end of the rear sealing ring (20) facing the bearing body (10); two sides of the L-shaped retaining strip (202) respectively abut against the rear end of the bearing outer ring (102) and the rear extension ring (121) of the rear sealing sliding ring (12); and the limiting groove (201) abuts against the bearing inner ring (103).

5. The bearing box according to claim 4, characterized in that: A broken line gap is formed between the contact surfaces of the rear sealing ring (20) and the rear sealing sliding ring (12); a stepped protrusion (203) is formed on the side of the rear sealing ring (20) facing the rear retaining ring (19); a stepped groove (192) is formed on the rear retaining ring (19); the stepped protrusion (203) matches the stepped groove (192) along the axial direction of the bearing body (10); A sealing flange (204) is formed on the side of the rear sealing ring (20) facing the bearing inner ring (103), and the sealing flange (204) abuts between the rear end of the bearing inner ring (103) and the rear retaining ring (19).

6. The bearing box according to claim 2, characterized in that: A limiting convex ring (21) extending in the axial direction of the bearing body (10) is integrally formed at the rear ends of the upper housing (14) and the upper housing (15); an extending convex ring (172) extending in the axial direction of the bearing body (10) is integrally formed at one end of the rear cover (17) facing the bearing body (10); the limiting convex ring (21) and the extending convex ring (172) are engaged with each other in a radial concave-convex manner along the bearing body (10).

7. The bearing box according to claim 2, characterized in that: A stop step (173) is integrally provided on one side of the rear stop cover (17) facing the bearing body (10), and the stop step (173) abuts against the rear sealing sliding ring (12) along the axial direction of the bearing body (10).

8. The bearing box according to claim 2, characterized in that: The front ends of the upper box body (14) and the upper box body (15) respectively abut against the end surface of the front cover (16); a limiting pressure ring (161) is integrally formed on a side of the front cover (16) facing the bearing body (10), and the limiting pressure ring (161) abuts against the front sealing slip ring (11) along the axial direction of the bearing body (10).

9. The bearing box according to claim 4, characterized in that: Also includes: A shaft end gland (22) detachably fixed to the end of the shaft neck; An oil retaining ring (23) pressed between the bearing inner ring (103) and the shaft end gland (22); A front sealing ring (24) is provided between the front sealing sliding ring (11) and the oil retaining ring (23).

10. The bearing box according to claim 9, characterized in that: An extension bar (241) extending along the axial direction of the bearing body (10) is provided at one end of the front sealing ring (24) facing the bearing body (10), and two sides of the extension bar (241) respectively abut against the front end of the bearing outer ring (102) and the front extension ring (111) of the front sealing sliding ring (11); A fold line gap is formed between the contact surfaces of the front sealing ring (24) and the front sealing sliding ring (11); A sealing lip ring (242) is formed on the side of the front sealing ring (24) facing the bearing inner ring (103), and the sealing lip ring (242) abuts between the front end of the bearing inner ring (103) and the oil retaining ring (23).

11. The bearing housing according to claim 10, characterized in that: The front sealing sliding ring (11) is formed with a front extension ring (111), and the front extension ring (111) and the rear extension ring (121) are respectively threadedly connected to two ends of the bearing outer ring (102).

12. A rail transit vehicle, characterized in that: It comprises a wheelset assembly, a bogie and a bearing box according to any one of claims 1 to 11, wherein the bearing box is connected between the wheelset assembly and the bogie.

13. A method for replacing grease of a bearing box, characterized in that: The bearing box according to any one of claims 1 to 11 comprises: After removing the lower housing, the grease outlet holes on the outer ring of the bearing are exposed; Remove the grease plug installed on the grease outlet hole; Remove the front cover and the rear cover from both ends of the bearing body respectively; After removing the oil drain plugs provided on the front sealing sliding ring and the rear sealing sliding ring from both ends of the bearing body, rotating the bearing body, and scraping the waste grease flowing out from both ends of the bearing body; A cleaning agent of set pressure is injected into the oil filling cavity of the bearing body from the front end of the bearing body, and the residual grease in the oil filling cavity is discharged from the oil drain hole provided in the rear sealing slip ring after being diluted; After the waste grease in the oil filling chamber is completely discharged, installing the grease outlet plug; Injecting clean grease into the oil filling cavity from the front end of the bearing body and the oil drain hole respectively; Remove the grease injection plug provided on the oil delivery hole of the upper housing, and inject clean grease into the grease injection hole provided on the outer ring of the bearing through the oil delivery hole; After the oil filling cavity is filled with clean grease, the grease filling plug, the oil drain plug, the front sealing slide ring, the front baffle, the rear baffle and the lower box are installed in sequence.

Images