A kind of axle end grounding device, axle and bogie

Abstract

The application provides an axle end grounding device, an axle and a bogie. The axle end grounding device comprises a sleeve, a second bearing, a frame body, a grounding ring and a second carbon brush assembly. The sleeve is internally provided with a first mounting hole, which makes a side wall of the sleeve form a first mounting wall. The grounding ring is internally provided with a second mounting hole, which makes a side wall of the grounding ring form a second mounting wall. The sleeve is sleeved with an inner ring of the second bearing. The sleeve is arranged in the second mounting hole. The second mounting wall is connected with the first mounting wall in a fit manner. An outer ring of the second bearing is sleeved with the frame body. A collecting cavity is formed between the frame body and the grounding ring. The frame body is provided with a mounting position for mounting the second carbon brush assembly. The mounting position is in radial communication with the collecting cavity. The axle end grounding device is installed on the end of the axle in a holding manner, the mounting reliability of the axle end grounding device is improved, and the driving safety is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of rail transit, and in particular to an axle end grounding device, an axle and a bogie. BACKGROUND

[0002] In recent years, rail transit has been rapidly developed, and is well known for energy saving, fast speed and large capacity. The axle box bearings of the bogies used by these vehicles are mostly arranged outside two wheels, i.e. the axle box outer type bogie (as shown in Figure 1 , in which 10 is a car body, 20 is a frame, 30 is a wheelset, and 40 is an axle box. With the development of railway vehicle technology, railway transportation cannot only aim at more and faster running, but also needs to meet the development concept of energy saving and consumption reduction, green environmental protection, and new requirements for lightweight, low noise, low energy consumption, low wheel-rail force, good curve passing safety and the like of the vehicle, thus forming a new generation of axle box bearing built-in type bogie, as shown in Figure 2 , which places the axle box 40 inside the wheelset 30, so that the frame 20 becomes an inner support mode. The axle box bearing built-in type bogie has the advantages of low curve running noise, light weight, strong curve passing ability and the like, and thus has been gradually developed.

[0003] The bogie of a rail vehicle is generally provided with a grounding device for preventing axle box bearing electric corrosion and realizing vehicle main current return grounding. At present, the grounding device of the axle box outer type bogie of a rail vehicle is usually installed on the box body of the axle box of the bogie, and current grounding return is realized by contact between the carbon brush and the end of the axle. In the axle box built-in type bogie, the axle box is arranged on the inner side, and the space for installing the grounding device on the axle box is limited, in addition, there is no axle box body on the outer end axle of the wheel, and the axle is a rotating part, so that the installation difficulty of the grounding device is increased if the grounding device is installed on the rotating axle.

[0004] As shown in Figure 3 , Figure 4As shown, the existing axle box built-in bogie grounding device mounting structure is that a first bearing 62 is arranged inside the grounding device 60, the outer ring of the first bearing 62 is fixed by left and right clamping plates, the left and right clamping plates are fastened by bolts and are connected to the mounting frame 61 by bolts, the inner ring is sleeved on the brush holder 64, the first carbon brush assembly 70 (including carbon brushes and accompanying parts) is installed in the brush holder 64, the brush holder 64 and the mounting seat 61 are provided with a grounding disc 63, the grounding disc 63 is in contact with the first carbon brush assembly 70, the side surface of the mounting seat 61 is attached to the side surface of the axle 2 and is fixed by bolts. The mounting seat 61 rotates with the axle 2, in order to avoid that the first carbon brush assembly 70 rotates with the axle 2, a connecting rod 50 is arranged on the brush holder 64 and is connected to the frame 20. In work, current flows into the axle 2 through the first carbon brush assembly 70 and flows to the track through the axle 2 and the wheel 1 in turn, so that the grounding return flow is realized. The grounding carbon brush of this structure is in contact with the grounding disc from the axial direction of the axle to conduct current.

[0005] However, the existing grounding device has the following problems:

[0006] (1) easy to fall off. The grounding device is installed on the axle end face by bolts, when the train runs, the impact or vibration between the wheel tread and the rail will cause the bolts to be loose or broken due to the vibration of the axle, which will cause the grounding device to fall off and cause great hidden dangers to the safe operation.

[0007] (2) connecting rod fracture. The connecting rod connects between the brush holder and the frame of the grounding device, during the train running, the displacement of the primary spring in all directions, especially the vertical displacement, will cause the relative movement between the frame and the axle box, at this time, the connecting rod pushes the grounding device to swing around the axle, in this movement process, the connecting rod is always in complex vibration, and the rigid connecting rod is easy to break after long-term work.

[0008] (3) affecting wheel turning. With the increase of train running mileage, the wheel shape is worn to different degrees, which causes abnormal vibration and noise during train running, and affects the stability of train running. In order to protect the performance of the vehicle, the out-of-round state of the wheel tread must be turned. The positioning hole of the wheel turning is the axle end center hole, but the center hole is blocked by the grounding device, so the axle end grounding device must be removed before the wheel turning.

[0009] Therefore, it is urgent to design a grounding device scheme suitable for the axle box built-in bogie to solve the above problems. SUMMARY

[0010] The purpose of the present application is to provide an axle end grounding device, axle and bogie, which can solve the problem of easy loosening of the grounding device.

[0011] The technical scheme of the present application is: a shaft end grounding device, comprising a sleeve, a second bearing, a frame body, a grounding ring and a second carbon brush assembly, the sleeve is provided with a first mounting hole, the first mounting hole is a blind hole so that a side wall of the sleeve forms a first mounting wall, the grounding ring is provided with a second mounting hole, the second mounting hole is a blind hole so that a side wall of the grounding ring forms a second mounting wall, one end of the outer circle of the sleeve is sleeved with the inner ring of the second bearing, the other end of the outer circle of the sleeve is placed in the second mounting hole, the second mounting wall is connected with the first mounting wall, the outer ring of the second bearing is sleeved with the frame body, a collecting cavity is formed between the frame body and the grounding ring, the frame body is provided with a mounting position for mounting the second carbon brush assembly, and the mounting position is in radial communication with the collecting cavity.

[0012] In the above scheme, the structure of the grounding device is optimized, which is changed from the original face-to-face lamination fixation of the axle shaft to the sleeve type (axle holding type) fixation to form the shaft end grounding device, that is, a sleeve capable of being sleeved on the end of the axle shaft is designed, the second bearing and the grounding ring are sleeved on the sleeve, and a part of the stress of the grounding device is transmitted to the end of the axle shaft (not only face-to-face lamination fixation in the axial direction), which greatly improves the installation reliability of the shaft end grounding device and improves the driving safety.

[0013] Preferably, the mounting position is on the lower side of the frame body. After the second carbon brush assembly is mounted on the mounting position, the center of gravity of the device is below the center line of the axle shaft, and when the axle shaft rotates, the second carbon brush assembly only swings slightly around the center of the axle shaft, and does not rotate with the axle shaft by 360 degrees, so that the connecting rod can be cancelled, and the problem of breaking and positioning of the connecting rod can be avoided.

[0014] Preferably, the second mounting wall is provided with petal holes for exposing the first mounting wall, the first mounting wall is provided with first bolts, the second mounting wall and the first mounting wall are provided with third bolts, the first bolts and the third bolts are arranged alternately on the same circumference, and the first bolts are located in the petal holes. The petal holes are three-petal-shaped torx holes.

[0015] With this structure design, the sleeve and the grounding ring of the shaft end grounding device can be connected into a whole through the third bolts, and then the whole shaft end grounding device can be connected to the axle shaft through the first bolts, and the disassembly is also the same, so that the whole grounding device can be installed and disassembled, and the use and maintenance are more convenient.

[0016] Preferably, the middle part of the first mounting wall is provided with a through hole, and the through hole is in communication with the petal hole. In this way, the positioning hole at the center position of the end of the axle shaft can be exposed, and the positioning of the wheel during refacing can be realized without disassembling the shaft end grounding device.

[0017] Preferably, the ground ring is provided with a side plate protruding away from one end of the second mounting wall, and an outer circular surface of the side plate is recessed to form a labyrinth seal structure.

[0018] Preferably, the labyrinth seal structure is a V-shaped ring groove with a large outer diameter and a small inner diameter, and a bottom of the V-shaped ring groove is a circular arc surface.

[0019] Preferably, the second carbon brush assembly is arranged in a cable bracket, and the cable bracket is fixed to the frame body by a second bolt arranged vertically.

[0020] The application also provides a vehicle axle, one end of the vehicle axle is provided with an end portion, the end portion is sleeved with the axle end grounding device, the sleeve is arranged in the first mounting hole in a sleeved manner, and a side surface of the end portion is connected to the first mounting wall.

[0021] In the above scheme, the vehicle axle is protruded in an axial direction, and the grounding device is arranged in a clamping manner and connected in a surface-to-surface manner, so that the impact resistance of the axle end grounding device is effectively improved, and the reliability of the connection and fastening of the grounding device is enhanced.

[0022] Preferably, the side surface of the end portion is provided with a positioning hole capable of being exposed in the axle end grounding device.

[0023] The application also provides a bogie, which comprises a wheel set, and the wheel set comprises a vehicle axle.

[0024] Compared with the related art, the application has the following beneficial effects:

[0025] I. The clamping installation is reliable. The axle end grounding device has no cantilever structure, and the second bearing is arranged in a clamping manner on the end portion of the vehicle axle, so that the installation reliability of the axle end grounding device is improved, and the driving safety is improved.

[0026] II. No connecting rod structure is designed. The gravity center of the axle end grounding device is controlled below the center line of the vehicle axle, and no connecting rod is arranged between the frame and the grounding device, so that the problem of the fracture and positioning of the connecting rod is avoided.

[0027] III. The wheel is conveniently turned. The side surface of the end portion is provided with a positioning hole capable of being exposed in the axle end grounding device, and the positioning hole is used for fixing a top pin of a machine tool, so that the wheel can be turned without disassembling the axle end grounding device.

[0028] Four, carbon powder collection function. The annular collection cavity is arranged between the grounding ring and the frame body, and the carbon powder can be cleaned in time and the second carbon brush assembly can be monitored regularly by disassembling the screw plug;

[0029] Five, convenient disassembly and assembly. The shaft end grounding device is arranged on the end portion outside the axle shaft, the space is sufficient, the grounding device assembly can be installed and disassembled as a whole, and only three bolts need to be operated for disassembly and assembly, so that the installation and maintenance are facilitated;

[0030] Six, wide universality. The shaft end grounding device adopts the annular grounding ring, has universality, and can be matched with the grounding devices of 1-3 second carbon brush assemblies. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is an arrangement schematic diagram of the shaft box outside arrangement;

[0032] Figure 2 It is an arrangement schematic diagram of the shaft box inside arrangement;

[0033] Figure 3 It is a three-dimensional schematic diagram of the installation of the existing grounding device;

[0034] Figure 4 It is a sectional view schematic diagram of the installation of the existing grounding device;

[0035] Figure 5 It is a structural schematic diagram of the grounding device provided by the application and without the carbon brush assembly;

[0036] Figure 6 It is a schematic diagram along the A direction; Figure 5

[0037] Figure 7 It is a schematic diagram of the installation structure of the grounding device provided by the application;

[0038] Figure 8 It is a schematic diagram along the B direction; Figure 7

[0039] Figure 9 It is a force analysis diagram of the grounding device.

[0040] ​​In the drawings: 1, wheel; 2, axle; 21, end; 22, positioning hole; 3, mounting frame; 31, end cover; 32, second bearing; 33, frame body; 34, grounding ring; 341, second mounting hole; 342, second mounting wall; 343, petal hole; 344, side plate; 35, sealing element; 36, third bolt; 37, sleeve; 371, first mounting hole; 372, first mounting wall; 373, through hole; 38, nut; 39, collection cavity; 310, labyrinth seal structure; 311, mounting position; 4, first bolt; 5, second carbon brush assembly; 6, second bolt; 7, cable frame; 8, insulating pad; 9, grounding cable; 10, vehicle body; 20, frame; 30, wheel set; 40, axle box; 50, connecting rod; 60, grounding device; 61, mounting seat; 62, first bearing; 63, grounding disc; 64, brush holder; 70, first carbon brush assembly. DETAILED DESCRIPTION

[0041] The application will be described in detail below with reference to the drawings and in conjunction with the embodiments. It should be noted that the embodiments in the application and the features in the embodiments can be combined with each other without conflict. For the convenience of description, if the terms “upper”, “lower”, “left” and “right” appear in the following, they only mean the upper, lower, left and right directions consistent with the drawings themselves, and do not limit the structure.

[0042] As shown in Figure 5 , Figure 7 The axle end grounding device provided by the embodiment includes a mounting frame 3, a first bolt 4, a second carbon brush assembly 5, a second bolt 6, a cable frame 7, an insulating pad 8 and a grounding cable 9.

[0043] The mounting frame 3 includes an end cover 31, a second bearing 32, a frame body 33, a grounding ring 34, a sealing element 35, a third bolt 36, a sleeve 37, a nut 38, a collection cavity 39, a labyrinth seal structure 310 and a mounting position 311.

[0044] The end cover 31 is a circular ring, and a sealing element and the sleeve 37 form a mounting chamber of the second bearing 32 in the inner ring of the end cover 31. The second bearing 32 is selected to be a self-sealing cylindrical roller bearing.

[0045] The sleeve 37 is provided with a first mounting hole 371 in the inside, and the first mounting hole 371 is a blind hole so that one side wall of the sleeve 37 forms a first mounting wall 372. The grounding ring 34 is provided with a second mounting hole 341 in the inside, and the second mounting hole 341 is a blind hole so that one side wall of the grounding ring 34 forms a second mounting wall 342. One end of the outer circle of the sleeve 37 is sleeved with the inner ring of the second bearing 32, and the other end of the outer circle of the sleeve 37 is placed in the second mounting hole 341, and the second mounting wall 342 is connected with the first mounting wall 372 in abutment.

[0046] The end cover 31 is arranged on the side of the second bearing 32 away from the grounding ring 34. The outer ring of the second bearing 32 is sleeved with the frame body 33. The sealing member 35 is arranged between the frame body 33 and the grounding ring 34 and between the end cover 31 and the sleeve 37, and the dynamic seal is formed through the sealing member 35.

[0047] The grounding ring 34 is in a ring structure, so that the mounting frame 3 can adapt to the number and size of different second carbon brush assemblies 5.

[0048] The frame body 33 and the grounding ring 34 form a collection cavity 39, and the frame body 33 is provided with a mounting position 311 for mounting the second carbon brush assembly 5, and the mounting position 311 is in radial communication with the collection cavity 39. As shown in Figure 7 Figure 8 The second carbon brush assembly 5 is arranged in the cable frame 7, and the cable frame 7 is fixed to the frame body 33 through the vertically arranged second bolt 6. The second carbon brush assembly 5 extends into the collection cavity 39 and contacts the grounding ring 34 from the mounting position 311. This structure realizes that the second carbon brush assembly 5 contacts the grounding ring in the radial direction of the axle to conduct current, and avoids that the second carbon brush assembly 5 is exposed to the outside, thereby guaranteeing good grounding effect. The second bolt 6 is sleeved with the insulating pad 8 in contact with the frame body 33. The second carbon brush assembly 5 leads out the grounding cable 9.

[0049] The second carbon brush assembly 5 and the grounding ring 34 rub to generate carbon powder, and the carbon powder falls into the collection cavity 39 under the action of gravity to realize storage of the carbon powder. The lower part of the collection cavity 39 is detachably provided with the screw plug 38, and through regular dismounting of the screw plug 38, simple and timely cleaning of the carbon powder can be realized. Through the screw plug 38, regular monitoring of the state of the second carbon brush assembly 5 can also be realized, thereby guaranteeing normal work of the grounding device.

[0050] The mounting position 311 is arranged on the lower side of the frame body 33, so that the second carbon brush assembly 5 is installed at the lowest position of the entire device. The mounting position 311 is a boss protruding downward from the frame body 33, and the boss is combined with the second carbon brush assembly 5, so that the center of gravity of the grounding device is lower than the center line of the rotation fulcrum axle. As shown in Figure 9 When the train runs, the friction force between the second carbon brush assembly 5 and the grounding ring 34 will make the entire grounding device swing α° to the left or right around the center of the axle 2, and the downward rotation moment generated by the deflection α° of the grounding device due to the deviation of the center of gravity from the lowest point and the friction moment between the second carbon brush assembly 5 and the grounding ring 34 are balanced. According to the principle of moment balance: M = F1·R = sinα·R·mg≥r·k·F f ​At this time, the second carbon brush assembly 5 can always keep its small swing state within (-α°, +α°). That is, by using the control method of low center of gravity of the grounding device, the stable installation of the grounding device can be realized, and the connecting rod 50 between the grounding device and the frame 20 does not need to be arranged, the components are reduced, and the problem of breaking of the connecting rod is avoided. Figure 2

[0051] The symbols in the above formula are explained as follows:

[0052] The restoring torque generated by the offset α° of the center of gravity of the combination of the frame 33 and the second carbon brush assembly 5

[0053] The component of the gravity of the combination of the frame 33 and the second carbon brush assembly 5 in the direction of the rotation circumference

[0054] The rotation radius of the center of gravity of the combination of the frame 33 and the second carbon brush assembly 5 from the center of the axle

[0055] The gravity of the combination of the frame 33 and the second carbon brush assembly 5

[0056] α-Deflection angle

[0057] r-Second carbon brush assembly 5 in the friction circle radius of the carbon brush

[0058] k-Second carbon brush assembly 5 between the carbon brush and the grounding ring 34 friction coefficient

[0059] F f -Spring pressure on the carbon brush in the second carbon brush assembly 5.

[0060] The above structure makes the frame 33 and the second carbon brush assembly 5 adapt to the rotation of the axle 2 (not rotate with the axle 2), and avoids the winding of the grounding cable 9. The second carbon brush assembly 5 internally includes a carbon brush, which is continuously in contact with the grounding ring 34 through a constant force spring, and guides the current to the track through the axle 2 and the wheel 1 to realize the grounding connection.

[0061] The above structure uses the low center of gravity control of the shaft end grounding device, can cancel the connecting rod between the shaft end grounding device and the frame, reduces the components, and avoids the problem of breaking of the connecting rod.

[0062] The side plate 344 protruding away from one end of the second mounting wall 342 is located in the collecting cavity 39, and the outer circular surface of the side plate 344 is recessed to form a labyrinth seal structure 310. The labyrinth seal structure 310 is a V-shaped ring groove with large outer diameter and small inner diameter, and the bottom of the V-shaped ring groove is a circular arc surface. A gap is provided between the side plate 344 and the second bearing 32.

[0063] ​The labyrinth seal structure 310 can block the carbon powder from entering the second bearing 32. If a small amount of carbon powder still enters, the self-sealing mechanism of the self-sealing cylindrical roller bearing selected for the second bearing 32 can further prevent the carbon powder from entering the interior of the second bearing 32, and the side plate 344 can also block the oil and grease thrown out of the second bearing 32 from contacting the grounding ring 34, thereby ensuring the normal operation of the grounding device.

[0064] As shown in Figure 6 , the second mounting wall 342 is provided with petal-shaped holes 343 for exposing the first mounting wall 372, and the first mounting wall 372 is provided with first bolts 4 for connecting the axle end grounding device with the end portion 21 of the axle 2. The third bolts 36 are arranged between the second mounting wall 342 and the first mounting wall 372, and the third bolts 36 are used to connect the grounding ring 34 and the sleeve 37. The first bolts 4 and the third bolts 36 are arranged on the same circumference and are staggered, and the first bolts 4 are located in the petal-shaped holes 343. In this way, the sleeve 37 and the grounding ring 34 of the axle end grounding device can be connected into a whole through the third bolts 36, and then the whole axle end grounding device can be connected to the axle 2 through the first bolts 4, and the same is true for disassembly, so that the overall installation and disassembly of the grounding device can be realized, and the use and maintenance are more convenient.

[0065] As shown in Figure 5 , Figure 6 , the middle portion of the first mounting wall 372 is provided with through holes 373 that are in communication with the petal-shaped holes 343.

[0066] As shown in Figure 5 , Figure 7 , the application further provides an axle 2, one end of which is provided with an end portion 21, and the end portion 21 is provided with the above-mentioned axle end grounding device. The sleeve 37 is arranged in the first mounting hole 371 in a sleeved manner, and the side surface of the end portion 21 is connected to the first mounting wall 372, thereby forming a shaft-holding type mounting structure, which effectively improves the impact resistance of the axle end grounding device and enhances the reliability of the connection and fastening of the axle end grounding device.

[0067] The side surface of the end portion 21 is provided with a positioning hole 22, which is a conical hole. The positioning hole 22 is in communication with the through holes 373 and the petal-shaped holes 343, so that the positioning hole 22 is exposed. The positioning hole 22 provides a fulcrum for the machining of the axle 2, and the positioning of the wheel during refacing can be realized without disassembling the axle end grounding device.

[0068] The axle 2 is provided with an end portion 21, and the second carbon brush assembly 5 is arranged in the external space of the axle 2, which is sufficient and does not need to be disassembled for the replacement of the second carbon brush assembly 5.

[0069] As Figure 3 , Figure 7 shown, the application also provides a bogie comprising a wheel set 30, the wheel set 30 comprising an axle 2 and wheels 1 arranged at both ends of the axle 2, the axle 2 being the above-mentioned axle.

[0070] The above is only an embodiment of the application, and does not limit the patent scope of the application. Any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, which is made by using the content of the specification and drawings of the application, is also included in the patent protection scope of the application.

Claims

1. A shaft end grounding device, characterized in that: The invention comprises a sleeve (37), a second bearing (32), a frame (33), a grounding ring (34) and a second carbon brush assembly (5), wherein a first mounting hole (371) is provided in the sleeve (37), the first mounting hole (371) is a blind hole so that a side wall of the sleeve (37) forms a first mounting wall (372), a second mounting hole (341) is provided in the grounding ring (34), the second mounting hole (341) is a blind hole so that a side wall of the grounding ring (34) forms a second mounting wall (342), one end of the outer circle of the sleeve (37) is sleeved on the inner ring of the second bearing (32), and the other end of the outer circle of the sleeve (37) is placed in the second mounting hole (341). ), the second mounting wall (342) is fitted and connected to the first mounting wall (372), the frame (33) is mounted on the outer ring of the second bearing (32), a collecting chamber (39) is formed between the frame (33) and the grounding ring (34), the frame (33) is provided with a mounting position (311) for mounting the second carbon brush assembly (5), and the mounting position (311) is radially connected to the collecting chamber (39); the second mounting wall (342) is provided with a petal hole (343) for exposing the first mounting wall (372), the middle part of the first mounting wall (372) is provided with a through hole (373), and the through hole (373) is connected to the petal hole (343).

2. The shaft end grounding device according to claim 1, characterized in that: The mounting position (311) is placed on the lower side of the frame (33).

3. The shaft end grounding device according to claim 1, characterized in that: A first bolt (4) is installed on the first mounting wall (372), and a third bolt (36) is installed between the second mounting wall (342) and the first mounting wall (372). The first bolt (4) and the third bolt (36) are staggered on the same circumference, and the first bolt (4) is located in the petal hole (343).

4. The shaft end grounding device according to claim 1, characterized in that: One end of the grounding ring (34) away from the second mounting wall (342) is protruded and provided with a side plate (344), and the outer circular surface of the side plate (344) is recessed to form a labyrinth sealing structure (310).

5. The shaft end grounding device according to claim 4, characterized in that: The labyrinth sealing structure (310) is a V-shaped ring groove that is larger on the outside and smaller on the inside, and the bottom of the V-shaped ring groove is an arc surface.

6. The shaft end grounding device according to claim 1, characterized in that: The second carbon brush assembly (5) is arranged in a cable rack (7), and the cable rack (7) is fixed to the rack body (33) via a second bolt (6) arranged vertically.

7. An axle, characterized in that: One end of the axle is protrudingly provided with an end portion (21), and the end portion (21) is fitted with the shaft end grounding device according to any one of claims 1 to 6, and the sleeve (37) is fitted so that the end portion (21) is placed in the first mounting hole (371), and the side surface of the end portion (21) is fitted and connected to the first mounting wall (372).

8. The axle according to claim 7, characterized in that A positioning hole (22) capable of being exposed in the shaft end grounding device is provided on the side surface of the end portion (21).

9. A bogie comprising a wheelset (30), wherein the wheelset (30) comprises an axle (2), characterized in that: The axle (2) is the axle according to claim 7 or 8.

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