CN111237433A

CN111237433A - Gear box and have its rail vehicle

Info

Publication number: CN111237433A
Application number: CN202010015612.3A
Authority: CN
Inventors: 阙红波; 刘莹; 孙静明; 陈瑞兴; 黄鹏; 魏世晨; 周骥
Original assignee: CRRC Qishuyan Institute Co Ltd
Current assignee: CRRC Qishuyan Institute Co Ltd
Priority date: 2020-01-07
Filing date: 2020-01-07
Publication date: 2020-06-05

Abstract

The invention provides a gearbox and a railway vehicle with the same. This gear box includes: the box body is provided with a first accommodating cavity, a second accommodating cavity, an oil inlet and an oil return hole, the oil inlet is communicated with the first accommodating cavity and the second accommodating cavity, the oil return hole is communicated with the first accommodating cavity and the second accommodating cavity, the oil inlet is arranged close to the top of the box body, and the oil return hole is arranged close to the bottom of the box body; the rotating shaft is rotatably arranged in the box body; the gear is arranged on the rotating shaft and is positioned in the first accommodating cavity; the bearing is arranged on the rotating shaft and is positioned in the second accommodating cavity; the sealing structure is arranged on the rotating shaft and is positioned at the other end of the bearing; the end cover is arranged on the box body and located on one side, far away from the bearing, of the sealing structure, a flow blocking channel is arranged between the sealing structure and the end cover and communicated with the second accommodating cavity, and the flow blocking channel is provided with a plurality of bending sections which are communicated in sequence. Through the technical scheme provided by the invention, the technical problem that the sealing performance of the gearbox of the light rail vehicle in the prior art is poor is solved.

Description

Gear box and have its rail vehicle

Technical Field

The invention relates to the technical field of gear boxes, in particular to a gear box and a railway vehicle with the same.

Background

At present, the low-floor light rail vehicle has the advantages of convenience in getting on and off, environmental protection, energy conservation and the like, and is becoming a novel rail transit operation mode in an urban rail transit network. The gearbox is a key core component installed on an urban railway vehicle bogie and plays an important role in traction and torque transmission in the operation of railway vehicles. In order to ensure the normal operation of the transmission of the gearbox, the important transmission components of the gears and bearings in the gearbox must be provided with sufficient lubricating oil for lubrication, and the lubricating oil in the gearbox must be ensured not to leak under different operating conditions and temperature rise conditions.

The bogie of the low-floor railway vehicle is very compact in structure, multiple in parts and extremely limited in space for arranging the gear box, so that each functional module and the whole design of the gear box are applicable only by being very compact, and the internal structure of the bogie is more complex than an iron gear box, so that the space for a sealing structure is very limited, and very high requirements are provided for the design of the sealing structure and the whole structure of the gear box.

In addition, low-floor rail vehicles are usually operated in open air lines without any shielding, and line conditions such as rain, snow, water accumulation and the like are often met. Especially when low-floor rail vehicle passes through the deeper highway section of ponding, perhaps meets and lasts or during great sleet and snow weather, because the waterproof sealing structure of gear box is unreasonable, outside sleet, water, impurity such as silt get into gear box inside very easily, cause the waterproof sealing of gear box to become invalid, and then lead to the inside lubricating oil of gear box to take place emulsification phenomenon, seriously influenced the lubricated effect of gear box bearing and gear.

Particularly, along with the gradual deterioration of global climate change in recent years, deep water accumulation is easily generated in large, medium and small cities in rainy seasons, and the water filling phenomenon is easily generated in the gear box of the railway vehicle, so that the waterproof sealing performance is invalid, the normal operation and the service life of the gear box of the railway vehicle are seriously influenced, and the maintenance cost of the railway vehicle is increased.

Disclosure of Invention

The invention provides a gearbox and a railway vehicle with the same, and aims to solve the technical problem that the gearbox of a light rail vehicle in the prior art is poor in sealing performance.

According to one aspect of the present invention, there is provided a gearbox comprising: the oil inlet hole is communicated with the first accommodating cavity and the second accommodating cavity, the oil return hole is communicated with the first accommodating cavity and the second accommodating cavity, the oil inlet hole is arranged close to the top of the box body, and the oil return hole is arranged close to the bottom of the box body; the rotating shaft is rotatably arranged in the box body; the gear is arranged on the rotating shaft and is positioned in the first accommodating cavity; the bearing is arranged on the rotating shaft and is positioned in the second accommodating cavity, and one end of the bearing is abutted to the gear; the sealing structure is arranged on the rotating shaft and is positioned at the other end of the bearing; the end cover is arranged on the box body and located on one side, far away from the bearing, of the sealing structure, the avoidance hole is formed in the end cover, the rotating shaft penetrates through the avoidance hole in the end cover, a flow blocking channel is arranged between the sealing structure and the end cover and communicated with the second containing cavity, and the flow blocking channel is provided with a plurality of bending sections which are communicated in sequence.

Further, the seal structure includes: the cylinder is sleeved on the rotating shaft; and the radial extension part is arranged on the cylinder body, and a flow blocking channel is arranged between the radial extension part and the end cover.

Further, the seal structure further includes: and the oil throwing part is arranged at one end of the radial extension part, which is far away from the cylinder body, and the oil throwing part and the symmetric axis of the rotating shaft are obliquely arranged.

Furthermore, the included angle between the oil slinging part and the symmetry axis of the rotating shaft is α, and α is more than or equal to 30 degrees and less than or equal to 45 degrees.

Further, one side of the radial extension part close to the end cover is provided with a plurality of grooves, one side of the end cover close to the radial extension part is provided with a plurality of protrusions, and the plurality of grooves and the plurality of protrusions are arranged at intervals correspondingly to form a flow blocking channel.

Furthermore, an annular groove is formed in the inner side of the end cover along the rotating shaft, a water dripping hole is formed in the bottom of the end cover, one end of the water dripping hole is communicated with the annular groove, and the other end of the water dripping hole is communicated with the outside.

Further, the radial extension part is located the middle part of barrel along the axis of rotation direction, and the one end and the bearing butt of barrel, the other end of barrel are located dodges downtheholely.

Furthermore, a lubricating groove is formed in the inner wall of the avoiding hole, and lubricating grease is placed in the lubricating groove.

Further, the edge of lubrication groove is provided with the bellying, and the bellying protrusion sets up in the inner wall of dodging the hole.

Furthermore, one end of the rotating shaft, which is positioned on the outer side of the end cover, is provided with a sealing groove, and a V-shaped sealing ring is arranged in the sealing groove.

Furthermore, the V-shaped sealing ring comprises a first sealing ring and a second sealing ring, the first sealing ring and the second sealing ring are arranged in a V-shaped structural connection mode, the first sealing ring is arranged on one side, away from the end cover, of the second sealing ring, the second sealing ring is arranged in an inclined mode with the symmetry axis of the rotating shaft, and the second sealing ring is abutted to the end cover.

Furthermore, an annular groove is formed in the inner side of the end cover along the rotating shaft, the annular groove is of an opening structure, at least part of the V-shaped sealing ring is located in the annular groove, a water dripping hole is formed in the bottom of the end cover, one end of the water dripping hole is communicated with the annular groove, and the other end of the water dripping hole is communicated with the outside.

Furthermore, the included angle between the water dripping holes and the symmetry axis of the rotating shaft is β, and β is more than or equal to 30 degrees and less than or equal to 45 degrees.

Furthermore, a second sealing groove is formed in the inner wall of the avoiding hole, the second sealing groove is arranged around the circumferential direction of the rotating shaft, and a dustproof sealing ring is arranged in the second sealing groove.

Further, the dustproof sealing ring comprises an elastic body and a supporting framework, the elastic body is made of elastic materials, and the supporting framework is arranged on the elastic body to support the elastic body through the supporting framework.

Furthermore, the elastic body is provided with a trapezoidal buffer groove.

Further, be provided with the V-arrangement groove on the elastic body, the both ends in V-arrangement groove all are used for carrying out the butt with the pivot and seal.

Furthermore, the elastic body comprises a first annular ring, a second annular ring and a third annular ring, the first annular ring is sleeved on the rotating shaft, the second annular ring is connected with the first annular ring, and the third annular ring is arranged at one end, far away from the first annular ring, of the second annular ring; the first annular ring, the second annular ring and the third annular ring enclose a trapezoidal buffer groove; one end of the first annular ring, which is far away from the second annular ring, is provided with a V-shaped groove so as to be abutted and sealed with the rotating shaft through two ends of the V-shaped groove.

Further, the pivot includes first shaft segment and second shaft segment, and first shaft segment and second shaft segment are connected, and the diameter of first shaft segment is less than the diameter of second shaft segment, and the end cover setting is on first shaft segment, and the both ends in V-arrangement groove all carry out the butt with first shaft segment and seal.

Further, the support framework is L-shaped.

Further, the gear box further comprises: and the baffle ring is arranged on the rotating shaft and is positioned between the bearing and the sealing structure, a communicating channel is arranged on the baffle ring, one end of the communicating channel is communicated with the second accommodating cavity, and the other end of the communicating channel is communicated with the flow blocking channel.

Furthermore, a first decompression cavity is arranged between the baffle ring and the bearing, a second decompression cavity is arranged between the baffle ring and the sealing structure, and the first decompression cavity and the second decompression cavity are both used for reducing the pressure of lubricating oil flowing into the second accommodating cavity from the first accommodating cavity.

Further, the gearbox is a gearbox for a light rail vehicle.

According to another aspect of the present invention there is provided a rail vehicle comprising a gearbox, the gearbox being a gearbox as provided above.

By applying the technical scheme of the invention, the gear box comprises: the device comprises a box body, a rotating shaft, a gear, a bearing, a sealing structure and an end cover. Wherein, the box has first chamber, the second that holds and holds chamber, inlet port and oil gallery, and the inlet port holds the chamber intercommunication with first chamber and the second that holds, and the oil gallery holds the chamber intercommunication with first chamber and the second that holds, and the inlet port is close to the top setting of box, and the oil gallery is close to the bottom setting of box. The rotating shaft is rotatably arranged in the box body. The gear sets up on the pivot, and is located first accommodation chamber. The bearing sets up in the pivot, and is located the second and holds the intracavity, and the one end and the gear butt of bearing. The sealing structure is arranged on the rotating shaft and is positioned at the other end of the bearing. The end cover is arranged on the box body and located on one side, far away from the bearing, of the sealing structure, the avoidance hole is formed in the end cover, the rotating shaft penetrates through the avoidance hole in the end cover, a flow blocking channel is arranged between the sealing structure and the end cover and communicated with the second accommodating cavity, and the flow blocking channel is provided with a plurality of bending sections which are communicated in sequence.

By adopting the gear box provided by the invention, when the gear rotates, the lubricating oil at the bottom of the first accommodating cavity is stirred up, the lubricating oil splashes to lubricate the bearing, the lubricating oil passes through the bearing and enters the second accommodating cavity, one part of the lubricating oil entering the second accommodating cavity returns to the box body under the action of gravity, and the other part of the lubricating oil flows out towards the outer direction of the gear box under the influence of inertia and internal pressure of the box body. Lubricating oil to the outside direction outflow of gear box will get into the choked flow passageway between seal structure and the end cover, sets up the choked flow passageway into many the sections of bending of intercommunication in order, so can block lubricating oil to reduce the outflow of lubricating oil in the gear box, improved the sealing performance of gear box, solved the not good technical problem of light rail vehicle gear box sealing performance among the prior art.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate exemplary embodiments of the invention and, together with the description, serve to explain the invention and are not intended to limit the invention. In the drawings:

FIG. 1 illustrates a schematic structural diagram of a gearbox according to an embodiment of the present invention;

FIG. 2 illustrates a partial schematic structural view of a gearbox according to an embodiment of the present invention;

FIG. 3 shows an enlarged view of the structure of FIG. 1 at a location corresponding to A;

FIG. 4 shows an enlarged view of the structure of FIG. 2 at a location corresponding to B;

FIG. 5 is a partial schematic structural view of a gearbox according to a second embodiment of the present invention;

FIG. 6 shows an enlarged view of the structure of FIG. 5 at a location corresponding to C;

FIG. 7 is a partial schematic structural view of a gearbox according to a third embodiment of the present invention;

FIG. 8 is a partial schematic structural view of a gearbox according to a fourth embodiment of the present invention.

Wherein the figures include the following reference numerals:

10. a box body; 11. an oil inlet hole; 12. an oil return hole; 13. an oil return cavity; 14. an oil sump; 20. a rotating shaft; 30. a gear; 40. A bearing; 50. a sealing structure; 51. a barrel; 52. a radial extension; 53. an oil throwing part; 60. an end cap; 61. an annular groove; 62. a water dripping hole; 63. a lubrication groove; 64. a boss portion; 70. a V-shaped sealing ring; 80. a dustproof sealing ring; 81. a fastener; 82. an elastic body; 821. a first annular ring; 822. a second annular ring; 823. a third annular ring; 83. a support framework; 84. A first groove; 85. a second groove; 90. a baffle ring; 91. a communication channel; 100. a first reduced pressure chamber; 110. a second reduced-pressure chamber; 120. a flow-blocking passage.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 4, a first embodiment of the present invention provides a gearbox including: the bearing assembly comprises a box body 10, a rotating shaft 20, a gear 30, a bearing 40, a sealing structure 50 and an end cover 60. Wherein, box 10 has first chamber, the second of holding, and oil inlet 11 and oil gallery 12 hold chamber, and oil inlet 11 holds the chamber intercommunication with first chamber and the second of holding, and oil gallery 12 holds the chamber intercommunication with first chamber and the second of holding, and oil inlet 11 is close to the top setting of box 10, and oil gallery 12 is close to the bottom setting of box 10. The rotation shaft 20 is rotatably provided in the case 10. The gear 30 is disposed on the rotating shaft 20 and located in the first accommodating cavity, and the gear 30 and the rotating shaft 20 in this embodiment are in interference fit, so that the rotating shaft 20 can drive the gear 30 to rotate smoothly. The bearing 40 is disposed on the rotating shaft 20 and located in the second accommodating cavity, the bearing 40 and the rotating shaft 20 are in interference fit, and one end of the bearing 40 abuts against the gear 30. The seal structure 50 is provided on the rotating shaft 20 and is located at the other end of the bearing 40. The box body 10 is further provided with an oil return cavity 13 and an oil collection groove 14, the oil return cavity 13 is communicated with the oil return hole 12, and the oil collection groove 14 is communicated with the oil inlet hole 11. The end cover 60 is arranged on the box body 10 and located on one side, far away from the bearing 40, of the sealing structure 50, an avoiding hole is formed in the end cover 60, the rotating shaft 20 penetrates through the avoiding hole of the end cover 60, and small clearance fit is formed between the rotating shaft 20 and the avoiding hole of the end cover 60, so that the rotating shaft 20 cannot drive the end cover 60 to rotate when rotating, but the clearance fit is not beneficial to sealing of the gear box. In order to reduce the outflow of the lubricating oil from the gap between the end cover 60 and the rotating shaft 20, in the present embodiment, a choke passage 120 is provided between the seal structure 50 and the end cover 60, the choke passage 120 communicates with the second accommodating chamber, and the choke passage 120 has a plurality of bent sections that communicate in sequence. Specifically, the sealing structure 50 is disposed on the rotating shaft 20 in an interference fit manner, and the flow blocking passage 120 may be communicated with the second accommodating cavity through the second pressure reducing cavity, the first pressure reducing cavity, the backflow cavity, and the oil return hole.

By adopting the gear box provided by the invention, the rotating shaft 20 drives the gear 30 to rotate when rotating, the gear 30 stirs up the lubricating oil at the bottom of the first accommodating cavity along with the rotation of the gear 30, the lubricating oil splashes to lubricate the bearing 40, then the lubricating oil passes through the bearing 40 and enters the second accommodating cavity, a part of the lubricating oil entering the second accommodating cavity returns to the box body 10 under the action of gravity, and the other part of the lubricating oil entering the second accommodating cavity is influenced by the inertia force and the internal pressure of the box body 10 and flows out towards the external direction of the gear box. Lubricating oil to the outside direction outflow of gear box will flow to seal structure 50 and end cover 60's direction to enter the choked flow passageway 120 between seal structure 50 and the end cover 60, set up choked flow passageway 120 into the many sections of bending that communicate in order, so can block lubricating oil, with the outflow of lubricating oil in the reduction gear box, improved the sealing performance of gear box. By improving the structure of the seal structure 50 and the end cover 60, the choke passage 120 is increased, and the amount of lubricating oil flowing out of the gear case is reduced. Specifically, the gear box in the embodiment may be a gear box of a low-floor rail vehicle, and is suitable for the low-floor rail vehicle.

Meanwhile, after external rainwater and impurities enter the gap between the end cover 60 and the rotating shaft 20, the multiple bending sections of the flow blocking channel 120 prevent the rainwater and the impurities from continuing to enter the second accommodating cavity, so that the effect of reducing the external rainwater and the impurities from entering the gear box is achieved. Specifically, a tapered non-contact mechanical seal structure (i.e., a tapered labyrinth seal structure) may be formed between the seal structure 50 and the end cover 60 to better prevent the lubricant from overflowing. Therefore, the gear box provided by the invention can reduce the outflow of lubricating oil in the gear box, reduce the entry of rainwater and sundries into the gear box and improve the sealing performance of the gear box, thereby solving the technical problem of poor sealing performance of the gear box of the light rail vehicle in the prior art.

Specifically, the seal structure 50 includes: a cylinder 51 and a radial extension 52. The barrel 51 is sleeved on the rotating shaft 20, the barrel 51 and the rotating shaft 20 are in interference fit, and due to the fact that the barrel 51 and the rotating shaft 20 are not in clearance, lubricating oil is prevented from flowing out of the barrel 51 and the rotating shaft 20, and therefore sealing performance can be improved. The radially extending portion 52 is provided on the cylinder 51, and a choke passage 120 is provided between the radially extending portion 52 and the end cover 60. With this arrangement, when the lubricating oil from the second accommodating chamber enters the choke passage 120, the radially extending portion 52 blocks the movement of the lubricating oil to the outside of the gear case, and the choke passage 120 also performs a good blocking function; meanwhile, the radial extension part 52 and the flow blocking channel 120 also play a role in blocking external rainwater and sundries, so that rainwater and sundries can be effectively reduced from entering the gear box, the sealing performance of the gear box is improved, and the leakage of lubricating oil is further reduced.

In this embodiment, the sealing structure 50 further includes an oil slinger 53, the oil slinger 53 is disposed at an end of the radially extending portion 52 away from the cylinder 51, the oil slinger 53 is disposed at an angle inclined with respect to the rotating shaft 20, and the oil slinger 53 is configured to block the lubricating oil from leaking out, so as to enhance the sealing effect.

Specifically, the rotating shaft 20 in the embodiment is of a symmetrical structure, the oil slinger 53 in the embodiment has an inclined angle α with respect to the symmetrical axis of the rotating shaft 20, wherein the inclined angle α is in the range of 10 ° to α to 60 °, preferably 20 ° to α to 45 °, and more preferably 30 ° to α to 45 °, so as to better block the leakage of lubricating oil and further enhance the sealing effect.

In order to facilitate the arrangement of the choke passage 120, in the present embodiment, a plurality of grooves are provided on a side of the radially extending portion 52 close to the end cover 60, and meanwhile, a plurality of protrusions are provided on a side of the end cover 60 close to the radially extending portion 52, and the plurality of grooves and the plurality of protrusions are arranged at intervals to form the choke passage 120. With this arrangement, when the lubricating oil flows to the side close to the end cover 60 via the side of the radially extending portion 52 remote from the end cover 60, the radially extending portion 52 and the choke passage 120 formed between the radially extending portion 52 and the end cover 60 will block the lubricating oil from flowing to the outside of the gear box. Meanwhile, the choke passage 120 and the radial extension portion 52 also have a good blocking effect on external impurities and rainwater, so that the rainwater and the impurities are reduced.

In order to facilitate the discharge of water or debris entering a gap between the end cover 60 and the rotating shaft 20 from the outside, in the present embodiment, an annular groove 61 is formed on the inner side of the end cover 60 along the outer circumferential surface of the rotating shaft 20, meanwhile, a water dropping hole 62 is formed in the bottom of the end cover 60, one end of the water dropping hole 62 is communicated with the annular groove 61, and the other end of the water dropping hole 62 is communicated with the outside, in such an arrangement, after the water or debris outside enters the gap between the end cover 60 and the rotating shaft 20, the water or debris will be collected in the annular groove 61 on the end cover 60, under the action of gravity, the water or debris in the annular groove 61 will be discharged from the water dropping hole 62 in the end cover 60, in the present embodiment, the water dropping hole 62 is disposed obliquely, specifically, an included angle between the water dropping hole 62 and the axis of symmetry of the rotating shaft 20 in the present embodiment is β, specifically, the included angle β is not greater than 45 °, the β is further preferably not greater than 30 ° or not greater than β ° so as to facilitate the discharge of the water dropping hole 62, further, and the water dropping hole 62 is not greater than the inner diameter of the axis of symmetry of the rotating shaft 20, and the axis of symmetry is not greater than the inner diameter of the axis of symmetry of the rotating shaft 20, and the axis of symmetry, the axis of symmetry is not greater than 367 mm, the axis of symmetry of the axis of the hole 62, the axis of symmetry, the axis of symmetry of.

Of course, it is understood that, in the first embodiment, the radially extending portion 52 may also be disposed in the middle of the cylinder 51 along the axial direction of the rotating shaft 20, one end of the cylinder 51 abuts against the bearing 40, and the other end of the cylinder 51 is located in the escape hole. With such an arrangement, one end of the bearing 40 abuts against the gear 30, and the other end of the bearing 40 abuts against the cylindrical body 51, whereby the bearing 40 can be positioned in the axial direction.

As shown in fig. 5 and 6, in the second embodiment, in particular, in order to improve the blocking effect of the choke passage 120, in the present embodiment, the radially extending portion 52 is disposed in the middle of the cylinder 51 along the line direction of the rotating shaft 20, one end of the cylinder 51 abuts against the bearing 40, and the other end of the cylinder 51 is located in the escape hole. With this arrangement, one end of the bearing 40 abuts against the gear 30, and the other end of the bearing 40 abuts against the cylindrical body 51, whereby the bearing 40 can be positioned in the axial direction. The other end of the cylinder body 51 is arranged in the avoiding hole of the end cover 60, so that the flow blocking channel 120 is convenient to arrange, and the spatial layout of the device is more reasonable.

As shown in fig. 5 and 6, in the second embodiment, in order to better improve the sealing performance of the gear box, a lubricating groove 63 is provided on the inner wall of the avoiding hole of the end cover 60, the lubricating groove 63 in the present embodiment is annularly provided on the end cover 60, and lubricating grease is placed in the lubricating groove 63. Through set up lubricating grease in lubrication groove 63 to form confined lubricating grease film, can prevent that the lubricating oil in the gear box from flowing out box 10, also avoided external rainwater debris to get into in the gear box simultaneously, improved the sealing performance of gear box. The lubricating groove 63 in this embodiment may also function to block the entry of external water vapor, and the annular groove 61 and the drip hole 62 may be omitted, so as to reduce the axial dimension and the radial dimension of the end cover 60, and therefore, the overall structure of the sealing structure 50 and the end cover 60 is compact, and the waterproof sealing effect is further improved. Specifically, the maximum groove depth of the lubrication groove 63 in the present embodiment is h₁Maximum groove depth h₁H can be more than or equal to 1mm₁Less than or equal to 4 mm. More preferably 1 mm. ltoreq.h₁Less than or equal to 2 mm. The lubrication grooves 63 are too shallow to provide effective lubrication and too deep to adversely affect the strength and sealing performance of the end cap.

In order to further improve the sealing performance, in the present embodiment, a protruding portion 64 is provided at the edge of the lubrication groove 63, and the protruding portion 64 is provided protruding from the inner wall of the avoidance hole. Specifically, both side edges of the lubrication groove 63 are provided with protrusions 64, the protrusions 64 protrude out of the side walls of the end cover 60, and the protrusions 64 may be formed by riveting, machining, welding or other processes, wherein the protrusions 64 are preferably formed by riveting, because the riveting process facilitates efficient manufacturing and has low production cost. Specifically, the convex portion in the present embodimentThe clearance between the boss 64 and the sealing structure 50 is extremely small, when the sealing structure rotates relative to the end cover 60, the sealing structure close to a point contact state between the boss 64 and the sealing structure 50 can form a line contact state, so that the entering of external water vapor can be effectively blocked, and the rotation of the sealing structure 50 is not influenced; further, after the lubricating grease is filled into the lubricating groove 63, a closed lubricating grease film can be further formed, and external water vapor, liquid and the like can be better prevented from entering the interior of the gear box. Meanwhile, the lubricating grease film can reduce the abrasion of the sealing structure 50 and the end cover 60, and plays a role in lubrication. The height of the boss 64 in this embodiment is h₂Specifically, the range of h is more than or equal to 0.1mm₂Not more than 0.5mm, and further preferably within the range of 0.3mm not more than h₂Less than or equal to 0.4mm, preferably h₂And is selected to be 0.35 mm.

As shown in fig. 7, in the third embodiment, the sealing structure 50 is substantially the same as the first embodiment except that: the sealing structure 50 is not provided with an oil slinger, and a rectangular labyrinth gap sealing structure is arranged between the outer end of the radial extension part and the end cover. Further, in the third embodiment, a seal groove is provided on one end of the rotation shaft 20 outside the end cover 60, and a V-shaped seal ring 70 is provided in the seal groove. In order to better improve the sealing performance of the gearbox, the opening of the V-shaped sealing ring is placed towards the end cover direction, the end part of one side, far away from the rotating shaft 20, of the V-shaped sealing ring abuts against the end cover 60 and can block the gap between the end cover 60 and the rotating shaft 20, therefore, lubricating oil is prevented from flowing out of the gearbox from the gap between the end cover 60 and the rotating shaft 20, and meanwhile, external rainwater and sundries are prevented from entering the gearbox. Meanwhile, since the contact area between the V-shaped seal ring 70 and the end cap 60 is small, the seal can be regarded as a linear seal structure, and thus the normal rotation of the rotating shaft 20 is not affected.

Meanwhile, in order to facilitate the matching of the V-shaped sealing ring 70 and the end cover 60 and the convenience of assembly and maintenance, the end cover 60 in this embodiment is also provided with a groove corresponding to the sealing groove of the rotating shaft 20, the groove is an annular groove 61, and a water dropping hole 62 is obliquely arranged at the bottom of the groove side wall of the annular groove 61 of the end cover 60, when external rainwater and sundries enter the annular groove, the rainwater and the sundries will be discharged from the water dropping hole 62 under the action of gravity, an included angle between the water dropping hole 62 and the symmetry axis of the rotating shaft 20 in this embodiment is β, specifically, the included angle β is not more than 45 degrees, the included angle β is further preferably not less than 30 degrees and not more than β degrees so as to further facilitate the water discharging of the water dropping hole 62, further, the inner diameter of the water dropping hole 62 is not less than 2mm, more preferably, the inner diameter of the water dropping hole 62 is not less than 3mm and not more than 8mm, and the inner diameter of the hole is too small or too large so.

Specifically, the surface roughness of the contact portion of the end cap 60 with the V-shaped seal ring in the present embodiment is Ra < 0.5, and Ra < 0.3 is the best, that is, the surface roughness Ra of the end cap in the contact portion with the V-shaped seal ring is < 0.5, and Ra < 0.3 is the best, which is a processing requirement for the surface of the end cap. In this way, the sealing effect can be enhanced while reducing wear. The V-shaped sealing ring is made of high-temperature-resistant composite rubber material, and the composite rubber material has good comprehensive mechanical properties, such as nitrile rubber or hydrogenated nitrile rubber.

Specifically, the V-shaped sealing ring 70 in this embodiment includes a first sealing ring and a second sealing ring, the first sealing ring and the second sealing ring are connected and disposed in a V-shaped structure, the first sealing ring is disposed on one side of the second sealing ring away from the end cover 60, the second sealing ring is disposed in an inclined manner with the rotating shaft 20, and the second sealing ring is used for abutting against the end cover 60. The annular groove formed in the rotating shaft 20 in this embodiment is used for axially limiting the V-shaped sealing ring, the lip (i.e., the abutting end of the second sealing ring) of the V-shaped sealing ring abuts against the end cover 60, and the lip is a wear-resistant part, so that the lip can be specially treated, for example, wear-resistant materials are covered by vulcanization to increase wear resistance, and the sealing effect is improved. Specifically, the lip abuts against the plane of the outer side of the end cover 60, and the included angle between the side of the V-shaped structure abutting against the end cover 60 and the symmetric axis of the rotating shaft 20 is in the range of about 30 degrees to 60 degrees, and may further preferably be in the range of 45 degrees to 50 degrees, so as to facilitate the water vapor and the like to be guided onto the plane of the outer side of the end cover 60, flow into the annular groove 61 under the action of gravity, and be discharged along the water dripping hole 62.

It should be noted that the seal structure 50 in the third embodiment may also be the seal structure in the first embodiment.

As shown in fig. 8, in the fourth embodiment, a second seal groove is provided on an inner wall of the relief hole of the end cover 60, the second seal groove being provided around the circumferential direction of the rotary shaft 20, and a dust seal ring 80 is provided in the second seal groove. The dust seal 80 in this embodiment is elastic dust seal 80, and this dust seal 80 includes elastic body 82, fastener 81 and supporting framework 83, wherein, elastic body 82 is made by elastic material, and the one end of elastic body 82 is laminated mutually with the lateral wall of second seal groove, and elastic body 82's the other end and the laminating of pivot 20 butt to both prevented lubricating oil outflow gear box, prevented again that external rainwater and debris from getting into in the gear box, thereby greatly promoted the sealing performance of gear box. In order to prevent the elastic body 82 from being greatly deformed to ensure the sealing performance of the dust seal 80, the supporting framework 83 in this embodiment is disposed in the right-angle end of the elastic body 82 to support the elastic body 82 through the supporting framework 83, so that the overall mechanical performance can be improved through the supporting framework 83, and the sealing performance can be enhanced. The support frame 83 is L-shaped to facilitate close engagement with the end cap side wall, and may be of other shapes. The support frame 83 is disposed in the elastic body 82 for supporting the elastic body 82, which can enhance and maintain a more durable sealing effect.

The elastic dust-proof sealing ring 80 in this embodiment has a first groove 84 and a second groove 85, wherein the first groove 84 is disposed near the rotating shaft 20, and the first groove 84 can reduce the contact area between the elastic dust-proof sealing ring 80 and the rotating shaft 20 on the premise of ensuring good sealing performance, thereby reducing the friction between the elastic dust-proof sealing ring 80 and the rotating shaft 20, and facilitating the smooth rotation of the rotating shaft 20. Meanwhile, because the first groove 84 is further set to be a V-shaped groove, both ends of the V-shaped groove can be abutted and sealed with the rotating shaft 20, so that a double-layer line sealing structure is formed between the elastic dustproof sealing ring 80 and the rotating shaft 20, the sealing effect is further increased, and the rotation of the rotating shaft 20 is not influenced. Specifically, one end of the V-shaped ring is abutted against a rotating shaft close to one end of the inner side of the box body so as to prevent the overflow of the internal lubricating oil. The other end of the V-shaped ring is abutted with the rotating shaft at one end far away from the box body, so that external water vapor is prevented from entering the interior of the gear box. Grease may be further stored in the V-shaped groove to reduce wear between both ends of the V-shaped ring and the rotating shaft 20.

Specifically, in the present embodiment, the elastic body 82 includes a first annular ring 821, a second annular ring 822, and a third annular ring 823, the first annular ring 821 is sleeved on the rotating shaft 20, the second annular ring 822 is connected to the first annular ring 821, and the third annular ring 823 is disposed at one end of the second annular ring 822 away from the first annular ring 821; the first annular ring 821, the second annular ring 822 and the third annular ring 823 enclose a trapezoidal buffer groove. One end of the first annular ring 821 remote from the second annular ring 822 is provided with a V-shaped groove to perform abutting sealing with the rotating shaft 20 through both ends of the V-shaped groove. By adopting the structure, the sealing effect can be better improved.

In this embodiment, the rotating shaft 20 includes a first shaft section and a second shaft section, the first shaft section and the second shaft section in this embodiment are both cylindrical structures, the first shaft section and the second shaft section are connected, the diameter of the first shaft section is smaller than that of the second shaft section, the end cover 60 is arranged on the first shaft section, and the two ends of the V-shaped groove are both abutted and sealed with the first shaft section. By adopting the arrangement, the end cover 60 can be conveniently sleeved on the rotating shaft 20, meanwhile, the installation in a smaller space is facilitated, and the compactness of the whole structure of the gear box is improved.

In order to make the elastic dustproof sealing ring 80 fit with the rotating shaft 20 more closely, a fastening piece 81 is further arranged in the embodiment, and the fastening piece 81 is arranged near the line sealing part close to the interior of the gear box. And fastener 81 sets up in the second recess to further improve the stability of elasticity dust seal 80, reinforcing sealing performance. Wherein, the fastening member 81 may be a snap spring. In this embodiment, the choke passage 120 is a wedge-shaped structure to greatly enhance the oil slinging and sealing effects. Specifically, the second recess in this embodiment is trapezoidal dashpot, and its opening is towards pivot and seal structure, can cushion the internal pressure of box through this trapezoidal dashpot, further reduces the risk that lubricating oil leaked.

In the first to fourth embodiments described above, specifically, the gear box further includes a baffle ring 90, the baffle ring 90 is in close clearance fit with the corresponding inner hole of the box 10, the baffle ring 90 is sleeved on the box 10 and is located in a cavity enclosed by the bearing 40, the sealing structure 50 and the end cover 60, the baffle ring 90 is substantially in a hollow cylindrical structure, one radial end surface of the baffle ring 90 abuts against the bearing 40, the other radial end surface of the baffle ring abuts against the end cover 60, the baffle ring 90 is provided with a communicating channel 91, one end of the communicating channel 91 is communicated with the second accommodating cavity, and the other end of the communicating channel 91 is communicated with the flow blocking channel 120. When the lubricating oil in the second accommodating chamber enters the decompression chamber through the communicating passage 91 of the retainer ring 90, the flow blocking passage 120 located outside thereof will block the lubricating oil from flowing out of the interior of the gear case.

Specifically, a first decompression chamber 100 is provided between the retainer ring 90 and the bearing 40, and a second decompression chamber 110 is provided between the retainer ring 90 and the sealing structure 50, so that after the lubricating oil enters the first decompression chamber 100 and the second decompression chamber 110 from the first accommodating chamber, the pressure of the lubricating oil is reduced by the first decompression chamber 100 and the second decompression chamber 110.

In this embodiment, the outer ring of the bearing 40 and the inner hole of the housing 10 may be in transition fit, the baffle ring 90 and the inner hole of the housing 10 may be in transition fit, and the end cover 60 and the inner hole of the housing 10 may be in transition fit.

By adopting the gear box provided by the first embodiment, through the arrangement of the flow blocking channel 120, the lubricating oil in the gear box is greatly reduced to flow out of the box body 10, and meanwhile, the external rainwater and sundries are also reduced to enter the box body 10. By adopting the gear box provided by the second embodiment, the lubricating groove 63 and the lubricating grease are additionally arranged on the basis of the first embodiment, so that the sealing performance of the gear box can be further improved. By adopting the gear box provided by the third embodiment, on the basis of the first embodiment, a V-shaped sealing groove is additionally arranged, the V-shaped sealing groove can cover the gap between the rotating shaft 20 and the end cover 60, and the sealing performance of the gear box can be further improved through a line sealing structure of the V-shaped groove and the end cover 60. By adopting the gear box provided by the fourth embodiment, the elastic dustproof sealing ring 80 is additionally arranged on the basis of the first embodiment, the double-layer line sealing structure between the elastic dustproof sealing ring 80 and the rotating shaft 20 prevents lubricating oil in the gear box from flowing out of the box body 10, and meanwhile, external rainwater and sundries are prevented from entering the box body 10, so that the sealing performance of the gear box is greatly improved.

The above embodiments of the present invention all include the communication channel 91, the communication channel 91 can be seen from the reference in fig. 4, and the drawings in other embodiments also include the communication channel 91, which is not shown.

In a further embodiment of the present invention, there is provided a rail vehicle comprising a gearbox, the gearbox being as provided in the above embodiments.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual scale relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion of it is not necessary in subsequent figures.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "on" or "over" other devices or configurations would then be oriented "under" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and unless otherwise stated, the terms have no special meaning, and therefore, the scope of the present invention should not be construed as being limited.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A gearbox, comprising:

the oil tank comprises a tank body (10) and a first oil inlet hole (12), wherein the tank body is provided with a first containing cavity, a second containing cavity, an oil inlet hole (11) and an oil return hole (12), the oil inlet hole (11) is communicated with the first containing cavity and the second containing cavity, the oil return hole (12) is communicated with the first containing cavity and the second containing cavity, the oil inlet hole (11) is arranged close to the top of the tank body (10), and the oil return hole (12) is arranged close to the bottom of the tank body (10);

a rotating shaft (20) rotatably disposed in the case (10);

the gear (30) is arranged on the rotating shaft (20) and is positioned in the first accommodating cavity;

the bearing (40) is arranged on the rotating shaft (20) and is positioned in the second accommodating cavity, and one end of the bearing (40) is abutted to the gear (30);

a sealing structure (50) arranged on the rotating shaft (20) and positioned at the other end of the bearing (40);

end cover (60), set up on box (10), and be located keeping away from of seal structure (50) one side of bearing (40), be provided with on end cover (60) and dodge the hole, pivot (20) are worn to establish dodge downthehole of end cover (60), seal structure (50) with the choked flow passageway has between end cover (60), the choked flow passageway with the chamber intercommunication is held to the second, the choked flow passageway has many the sections of bending that communicate in order.

2. Gearbox according to claim 1, characterized in that said sealing structure (50) comprises:

the cylinder (51) is sleeved on the rotating shaft (20);

a radially extending portion (52) disposed on the cylinder (51), the choke passage being disposed between the radially extending portion (52) and the end cap (60).

3. The gearbox according to claim 2, characterized in that the radially extending portion (52) is located in the middle of the cylinder (51) along the line of the rotating shaft (20), one end of the cylinder (51) abuts against the bearing (40), and the other end of the cylinder (51) is located in the relief hole.

4. The gearbox according to claim 3, characterized in that a lubrication groove (63) is arranged on the inner wall of the avoiding hole, and the lubrication groove (63) is used for placing lubricating grease; the edge of lubrication groove (63) is provided with bellying (64), bellying (64) protrusion in the inner wall setting of dodging the hole.

5. Gearbox according to claim 2, characterised in that the end of the shaft (20) outside the end cover (60) is provided with a sealing groove in which a V-ring (70) is arranged.

6. The gearbox according to claim 5, characterized in that the V-shaped sealing ring (70) comprises a first sealing ring and a second sealing ring, the first sealing ring and the second sealing ring are arranged in a V-shaped structure connection manner, the first sealing ring is arranged on one side, away from the end cover (60), of the second sealing ring, the second sealing ring is obliquely arranged with respect to a symmetry axis of the rotating shaft (20), and the second sealing ring is abutted against the end cover (60).

7. The gearbox according to claim 5, characterized in that the inner side of the end cover (60) is provided with an annular groove (61) along the rotating shaft (20), the annular groove is of an open structure, at least part of the V-shaped sealing ring (70) is positioned in the annular groove (61), the bottom of the end cover (60) is provided with a water dropping hole (62), one end of the water dropping hole (62) is communicated with the annular groove (61), and the other end of the water dropping hole (62) is communicated with the outside.

8. The gearbox according to claim 2, wherein a second sealing groove is provided on an inner wall of the avoiding hole, the second sealing groove is provided around a circumferential direction of the rotating shaft (20), and a dust seal ring (80) is provided in the second sealing groove.

9. Gearbox according to claim 8, characterised in that said dust seal (80) comprises an elastic body (82) and a support skeleton (83), said elastic body (82) being made of an elastic material, said support skeleton (83) being arranged inside said elastic body (82) to support said elastic body (82) by means of said support skeleton (83).

10. A rail vehicle comprising a gearbox, characterized in that the gearbox is a gearbox according to any one of claims 1-9.