CN110725930A

CN110725930A - Gear box and rail vehicle

Info

Publication number: CN110725930A
Application number: CN201911002619.5A
Authority: CN
Inventors: 黄鹏; 陈瑞兴; 孙静明
Original assignee: CRRC Qishuyan Institute Co Ltd
Current assignee: CRRC Qishuyan Institute Co Ltd
Priority date: 2019-10-21
Filing date: 2019-10-21
Publication date: 2020-01-24
Anticipated expiration: 2039-10-21
Also published as: CN110725930B

Abstract

The invention provides a gear box and a rail vehicle, wherein a box body, a transmission assembly and an oil pump are arranged in the gear box, the transmission assembly comprises a driving gear and a driven gear which are arranged in the box body, the oil pump is arranged in the box body, the oil pump comprises an oil conveying assembly and a pump gear, the oil conveying assembly is used for sucking and discharging oil, the pump gear is in driving connection with the oil conveying assembly, the driven gear is meshed with the pump gear to drive the pump gear to rotate, an oil suction port of the oil pump is communicated with an oil storage area of the box body to suck lubricating oil, and an oil outlet is used for supplying oil to a preset part of the transmission assembly to lubricate; under the condition that the oil pump is in a first running state and the oil pump is in a second running state, lubricating oil flows in the oil pump along the same preset path; the oil pump is in a first running state under the condition that the driving gear positively rotates, and the oil pump is in a second running state under the condition that the driving gear reversely rotates. The technical scheme can simplify the structure of the gear box, reduce the size and the weight and realize light weight.

Description

Gear box and rail vehicle

Technical Field

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

Background

The traditional rail transit gear box mainly adopts a splash lubrication lubricating mode. Along with the development increase of various novel rail transit vehicles, the structural style of rail transit gear box is gradually diversified. Aiming at parts with higher positions or relatively independent internal spaces in the gear box, the traditional splash lubrication mode cannot meet the internal lubrication requirement. Therefore, in the field of rail transit or other fields where lubrication requirements are high, there is a need for forced lubrication of gearboxes.

In order to realize forced lubrication, an oil pump lubrication scheme is arranged outside a box body of a gear box in the prior art, and an additional oil pump driving device and a control device are needed in the scheme, so that the system is more complex, the weight of the whole set of transmission device is increased, and the light weight is not facilitated to be realized. In addition, in the fields of rail transit and the like, teeth in a gear box usually rotate forwards and reversely to meet the operation requirements, and the existing oil pump can only be driven independently under the condition to realize that lubricating oil flows along the same path all the time to meet the lubricating requirements, so that the light weight development of the gear box is limited.

Disclosure of Invention

The invention provides a gearbox and a railway vehicle, and aims to solve the problems that the gearbox needing forced lubrication in the prior art is complex in structure and heavy in weight.

In order to solve the above-mentioned problems, according to an aspect of the present invention, there is provided a gearbox including: the lubricating oil storage box comprises a box body, wherein a main cavity is formed in the box body, and the bottom of the main cavity is an oil storage area for storing lubricating oil; the transmission assembly comprises a driving gear and a driven gear which are arranged in the box body, the driving gear can rotate forwards or reversely, and the driving gear is meshed with the driven gear to drive the driven gear to rotate; the oil pump is arranged in the box body and comprises an oil conveying assembly and a pump gear, wherein the oil conveying assembly is used for sucking oil and discharging oil, the pump gear is in driving connection with the oil conveying assembly to drive the oil conveying assembly to operate, and the driven gear is meshed with the pump gear to drive the pump gear to rotate; an oil suction port of the oil pump is communicated with the oil storage area to suck lubricating oil, and an oil outlet of the oil pump is used for supplying oil to a preset part of the transmission assembly to lubricate the preset part; the oil pump has a first running state and a second running state, and under the condition that the oil pump is in the first running state and the oil pump is in the second running state, lubricating oil flows in the oil pump along the same preset path; the oil pump is in a first running state under the condition that the driving gear positively rotates, and the oil pump is in a second running state under the condition that the driving gear reversely rotates.

Further, transmission assembly still includes input shaft, first bearing and output shaft, and the input shaft rotationally sets up, and first bearing cover is established on the input shaft, and the driving gear setting is on the input shaft, and the output shaft rotationally sets up, and driven gear sets up on the output shaft, and the oil-out of oil pump is used for carrying lubricating oil to first bearing.

Further, the box includes first cavity and the second cavity with the main cavity intercommunication respectively, and first bearing is located first cavity, and the input shaft passes to establish through first cavity, and the oil pump still includes the pump body, and the oil transportation subassembly sets up in the pump body, and the pump body setting is in the second cavity.

Furthermore, the oil delivery assembly comprises a pump shaft, an inner rotor and an outer rotor, the pump shaft is connected with the pump gear, the inner rotor is arranged on the pump shaft and is positioned in a cavity of the outer rotor, the rotating center line of the outer rotor is eccentrically arranged relative to the rotating center line of the inner rotor, and a low-pressure cavity and a high-pressure cavity are arranged between the outer rotor and the inner rotor to respectively absorb oil and discharge oil; the rotating center line of the outer rotor is provided with a first position and a second position which are arranged at intervals, and under the condition that the driving gear rotates positively, the rotating center line of the outer rotor moves to the first position to switch the oil pump to a first running state; under the condition that the driving gear reversely rotates, the rotation center line of the outer rotor moves to a second position to switch the oil pump to a second running state.

Further, the oil transportation assembly further comprises: the outer rotor is arranged in the accommodating cavity, a first gap is formed between the outer wall of the outer rotor and the inner wall of the eccentric ring, and the outer rotor can drive the eccentric ring to rotate within a preset angle range through friction force when rotating; under the condition that the driving gear rotates positively, the outer rotor drives the eccentric ring to rotate to and keep at a first preset position, so that the rotation center line of the outer rotor is limited to the first position through the eccentric ring; under the condition that the driving gear rotates reversely, the outer rotor drives the eccentric ring to rotate to and keep at a second preset position, so that the rotation center line of the outer rotor is limited to the second position through the eccentric ring.

Furthermore, the eccentric ring is provided with an arc-shaped reversing groove, the oil delivery assembly further comprises a limiting part fixedly arranged, one end of the limiting part is located in the reversing groove, and the limiting part is used for being matched with one end stop of the reversing groove to limit the eccentric ring at a first preset position or being matched with the other end stop of the reversing groove to limit the eccentric ring at a second preset position.

Further, the oil pump still includes the pump body, and oil-sucking mouth and oil-out all set up on the pump body, and the eccentric ring can rotationally set up in the pump body, has the second clearance between the outer wall of eccentric ring and the inner wall of pump body, and the size in second clearance is greater than the size in first clearance.

Furthermore, the oil conveying assembly further comprises a pressing plate and an intermediate plate, the pressing plate and the intermediate plate are respectively located on two sides of the outer rotor, the intermediate plate is provided with a first arc-shaped hole and a second arc-shaped hole, the first arc-shaped hole is communicated with an oil suction opening of the oil pump and communicated with the low pressure cavity to suck oil, the second arc-shaped hole is communicated with the high pressure cavity, and the second arc-shaped hole is communicated with an oil outlet of the oil pump to discharge oil.

Further, the oil pump also comprises a pump body, a second bearing and a third bearing, wherein the pump body comprises a first split body, a second split body and a third split body which are sequentially connected, the pump shaft sequentially penetrates into cavities of the first split body, the second split body and the third split body, the outer rotor is positioned in the cavity of the second split body, the second bearing is sleeved on the pump shaft and positioned in the cavity of the first split body, and the third bearing is sleeved on the pump shaft and positioned in the cavity of the third split body.

Further, the gear box comprises an oil suction oil way and an oil outlet oil way which are arranged in the side wall of the box body, wherein the inlet of the oil suction oil way is communicated with the oil storage area, the outlet of the oil suction oil way is communicated with the oil suction opening of the oil pump, the inlet of the oil outlet oil way is communicated with the oil outlet of the oil pump, and the outlet of the oil outlet oil way is used for supplying oil to a preset part of the transmission assembly.

Further, the gear box further comprises: the filter core sets up in the oil absorption oil circuit, and the filter core is used for filtering the lubricating oil before getting into the oil pump.

The gearbox further comprises an oil spilling oil path arranged in the side wall of the box body, an outlet of the oil outlet path is communicated with an inlet of the oil spilling oil path to output excessive lubricating oil supplied by the oil outlet path, and an outlet of the oil spilling oil path is communicated with the oil storage area to enable at least one part of the excessive lubricating oil to flow back to the oil storage area.

Further, the transmission assembly further comprises an input shaft, a first bearing and a bearing seat, the bearing seat is arranged in the box body, the input shaft is rotatably arranged, the first bearing is sleeved on the input shaft and located in the bearing seat, the driving gear is arranged on the input shaft, and an oil conveying hole communicated with an outlet of the oil outlet oil way is formed in the bearing seat so as to convey lubricating oil into the first bearing through the oil conveying hole.

Furthermore, the oil spilling oil way comprises an arc-shaped groove and an oil return hole which are communicated with each other, the arc-shaped groove is communicated with an outlet of the oil outlet oil way, the arc-shaped groove is arranged around the bearing seat, and an outlet of the oil return hole is communicated with the oil storage area, so that a part of excessive lubricating oil flows back to the oil storage area; and an oil overflow groove communicated with the oil overflow oil way is arranged on the side wall of the bearing seat, and an outlet of the oil overflow groove is communicated with the oil storage area so as to enable the other part of the excessive lubricating oil to flow back to the oil storage area.

Furthermore, the box body comprises a first cavity communicated with the main cavity, the bearing seat is arranged in the first cavity, the transmission assembly further comprises a sealing cover and a sealing ring, the sealing cover is matched with the box body to seal an opening of the first cavity, and the sealing ring is arranged between the sealing cover and the first bearing; the gearbox further comprises an oil return oil way arranged on the inner wall of the first cavity, an oil return hole is formed in the bearing seat, an inlet of the oil return hole is communicated with an area between the sealing cover and the sealing ring, an outlet of the oil return hole is communicated with an inlet of the oil return oil way, and an outlet of the oil return oil way is communicated with the oil storage area so as to enable lubricating oil between the sealing cover and the sealing ring to flow back into the oil storage area.

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

By applying the technical scheme of the invention, the gearbox is provided with a box body, a transmission assembly and an oil pump in the gearbox, wherein the transmission assembly comprises a driving gear and a driven gear which are arranged in the box body, the oil pump is arranged in the box body and comprises an oil conveying assembly and a pump gear, the oil conveying assembly is used for sucking and discharging oil, the pump gear is in driving connection with the oil conveying assembly to drive the oil conveying assembly to run, the driven gear is meshed with the pump gear to drive the pump gear to rotate, an oil suction port of the oil pump is communicated with an oil storage area of the box body to suck lubricating oil, and an oil outlet of the oil pump is used for supplying oil to a preset part of the transmission assembly to lubricate. Through the arrangement, the oil pump is arranged in the box body, and the driven gear of the gearbox can directly drive the pump gear of the oil pump to rotate so as to realize the operation of the oil pump, so that an additional oil pump driving device and a control device are not needed. Therefore, the technical scheme can simplify the structure of the existing gear box needing forced lubrication, reduce the whole size of the gear box and the weight of the gear box, thereby being beneficial to realizing light weight.

Moreover, because the oil pump in the gear box is in first running state and the oil pump is in the condition of second running state, lubricating oil all flows along the same route of predetermineeing in the oil pump, no matter the driving gear is corotation or reversal when the gear box is in the operation like this, the flow direction of lubricating oil can not change yet to satisfy lubricated demand, guarantee lubricated effect. The structure arrangement also realizes that the oil pump does not need to be driven independently, but is driven by the driven gear, and the light weight of the gear box is realized.

Furthermore, an oil pump is arranged in the gearbox, the flow direction of lubricating oil is not changed along with the steering of the driving gear, a lubricating oil way is arranged in the box wall and related structures, the whole structure is compact, the occupied space is small, the weight is light, the reliability is high, and the maintainability is good. Along with the operation of the gear box, the driven gear drives a pump gear of the oil pump to operate to drive the oil pump to work, lubricating oil is sucked from the bottom of the box body, is filtered by the filter element and is conveyed into the bearing seat, the purpose of lubricating a bearing is achieved, and overflowed lubricating oil flows back to the bottom of the box body. When the vehicle runs in a reversing way, the gear steering is changed, the flow direction of lubricating oil in the oil pump is kept unchanged, and the bearing is always in a good lubricating state.

The oil pump of the gear box is driven by only one gear, and the oil pump is directly embedded on the box wall, so that the whole structure is simple and compact, the occupied space is small, and the weight is light; the oil pump and the filter element can be disassembled and assembled by disassembling and assembling the screw, the assembly manufacturability is good, the inspection and maintenance operation is convenient, the required working time is short, and the maintainability of the system is good; after the lubricating oil is filtered by the filter element, the working environment of the oil pump and the bearing is clean, the failure risk of the oil pump and the bearing is reduced, the oil way is arranged in the wall of the tank, the pipeline has no risk of loosening and can not collide with other components, and the overall reliability of the system is high; the lubricating system has an oil spilling oil path, so that the oil pressure of a sealing element can be reduced, the leakage risk of lubricating oil is reduced, and the environment is not polluted. The lubricating system is well suitable for the working condition requirements of the rail transit gearbox.

Drawings

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

FIG. 1 illustrates a schematic structural view of a gearbox provided by an embodiment of the present invention;

FIG. 2 shows a cross-sectional view of FIG. 1 at location A-A;

FIG. 3 shows a cross-sectional view of FIG. 1 at location B-B;

FIG. 4 shows a schematic diagram of the oil pump of FIG. 3;

FIG. 5 shows a schematic view of the oil pump of FIG. 4 in a first operating state;

FIG. 6 shows a schematic view of the oil pump of FIG. 4 in a second operating state;

FIG. 7 shows a front view of the eccentric ring of FIG. 4;

FIG. 8 shows a perspective view of the eccentric ring of FIG. 7;

FIG. 9 shows a front view of the intermediate plate of FIG. 4;

FIG. 10 shows a cross-sectional view of the intermediate plate of FIG. 9;

fig. 11 shows a partial enlarged view of the structure in fig. 4.

Wherein the figures include the following reference numerals:

1. a box body; 2. an input shaft; 3. a driven gear; 4. a pump gear; 5. an oil pump; 6. a first bearing; 7. a bearing seat; 8. a seal ring; 9. an end cap; 10. a sealing cover; 11. a gasket; 12. a first seal ring; 13. a filter element; 14. a second seal ring; 15. a plug; 16. a box cover; 18. lubricating oil; 19. a driving gear; 21. a first split body; 22. a pump shaft; 23. a second bearing; 24. a spacer ring; 25. pressing a plate; 26. a circlip; 27. a second body; 28. an eccentric ring; 29. an outer rotor; 30. an inner rotor; 31. a limiting member; 32. a third bearing; 33. a middle plate; 34. a cover plate; 35. a third split; 1-1, an oil suction way; 1-2, an oil outlet oil way; 1-3, oil spilling oil circuit; 1-4, an oil return path; 1-5, an oil spilling tank; 2-1, a first arc-shaped hole; 2-2, a second arc-shaped hole; 3-1, oil suction port; 3-2, oil outlet; 4-1, a reversing groove.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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 the drawings, embodiments of the present invention provide a gearbox comprising: the lubricating oil storage tank comprises a tank body 1, wherein a main cavity is arranged in the tank body 1, and the bottom of the main cavity is an oil storage area for storing lubricating oil 18; the transmission assembly comprises a driving gear 19 and a driven gear 3 which are arranged in the box body 1, the driving gear 19 can rotate forwards or backwards, and the driving gear 19 is meshed with the driven gear 3 to drive the driven gear 3 to rotate; the oil pump 5 is arranged in the box body 1, the oil pump 5 comprises an oil conveying assembly and a pump gear 4, the oil conveying assembly is used for sucking oil and discharging oil, the pump gear 4 is in driving connection with the oil conveying assembly to drive the oil conveying assembly to run, and the driven gear 3 is meshed with the pump gear 4 to drive the pump gear 4 to rotate; an oil suction port 3-1 of the oil pump 5 is communicated with the oil storage area to suck lubricating oil 18, and an oil outlet 3-2 of the oil pump 5 is used for supplying oil to a preset part of the transmission assembly to lubricate the preset part; the oil pump 5 has a first operating state and a second operating state, and the lubricating oil 18 flows along the same preset path in the oil pump 5 under the condition that the oil pump 5 is in the first operating state and the oil pump 5 is in the second operating state; the oil pump 5 is in the first operating state with the drive gear 19 rotating in the normal direction, and the oil pump 5 is in the second operating state with the drive gear 19 rotating in the reverse direction. In the present embodiment, the driving gear 19, the driven gear 3 and the pump gear 4 are all bevel gears, which makes the arrangement of the gear box compact, and reduces the size and the occupied space.

By applying the technical scheme of the invention, a box body 1, a transmission assembly and an oil pump 5 are arranged in a gear box, wherein the transmission assembly comprises a driving gear 19 and a driven gear 3 which are arranged in the box body 1, the oil pump 5 is arranged in the box body 1, the oil pump 5 comprises an oil conveying assembly and a pump gear 4, the oil conveying assembly is used for sucking and discharging oil, the pump gear 4 is in driving connection with the oil conveying assembly to drive the oil conveying assembly to run, the driven gear 3 is meshed with the pump gear 4 to drive the pump gear 4 to rotate, an oil suction port 3-1 of the oil pump 5 is communicated with an oil storage area of the box body 1 to suck lubricating oil, and an oil outlet 3-2 of the oil pump 5 is used for supplying oil to a preset part of the transmission assembly to lubricate the. With the arrangement, the oil pump 5 is arranged in the box body 1, and the driven gear 3 of the gear box can directly drive the pump gear 4 of the oil pump 5 to rotate so as to realize the operation of the oil pump 5, so that an additional oil pump driving device and a control device are not needed. Therefore, the technical scheme can simplify the structure of the existing gear box needing forced lubrication, reduce the whole size of the gear box and the weight of the gear box, thereby being beneficial to realizing light weight.

Moreover, because the oil pump 5 in the gear box is in the first running state and the oil pump 5 is in the second running state under the circumstances, lubricating oil 18 all flows along the same route of predetermineeing in the oil pump 5, no matter driving gear 19 is corotation or reversal when the gear box is in operation like this, lubricating oil 18's flow direction all can not change to satisfy lubricated demand, guarantee lubricated effect. The arrangement of the structure also realizes that the oil pump 5 is not required to be driven independently, but is driven by the driven gear 3, and the light weight of the gear box is realized.

As shown in fig. 1, the transmission assembly further includes an input shaft 2, a first bearing 6 and an output shaft, the input shaft 2 is rotatably disposed, the first bearing 6 is sleeved on the input shaft 2, a driving gear 19 is disposed on the input shaft 2, the output shaft is rotatably disposed, a driven gear 3 is disposed on the output shaft, and an oil outlet 3-2 of the oil pump 5 is used for conveying lubricating oil 18 to the first bearing 6. Therefore, the driven gear 3 and the oil pump 5 can be driven to synchronously operate by the rotation of the input shaft 2, and the structure of the gear box is simplified. The first bearing 6 can be lubricated by the oil pump 5 to ensure the long-term reliable and stable operation of the gearbox. In the present embodiment, the first bearing 6 is a tapered roller bearing.

In this embodiment, box 1 is including the first cavity and the second cavity with the main cavity intercommunication respectively, and first bearing 6 is located the first cavity, and input shaft 2 wears to establish through the first cavity, and oil pump 5 still includes the pump body, and the oil transportation subassembly sets up in the pump body, and the pump body setting is in the second cavity. With the above arrangement, the arrangement of the respective parts can be made more compact, thereby reducing the size of the gear box and eliminating the need for specially providing structural members for mounting the oil pump 5.

As shown in fig. 3 to 6 and 11, the oil delivery assembly includes a pump shaft 22, an inner rotor 30, and an outer rotor 29, the pump shaft 22 is connected to the pump gear 4, the inner rotor 30 is disposed on the pump shaft 22 and the inner rotor 30 is located in a cavity of the outer rotor 29, a rotation center line of the outer rotor 29 is eccentrically disposed with respect to a rotation center line of the inner rotor 30, and a low pressure chamber and a high pressure chamber are provided between the outer rotor 29 and the inner rotor 30 to respectively suck oil and discharge oil; wherein, the rotation center line of the outer rotor 29 has a first position and a second position which are arranged at intervals, and under the condition that the driving gear 19 rotates positively, the rotation center line of the outer rotor 29 moves to the first position to switch the oil pump 5 to a first running state; in the case where the drive gear 19 is reversely rotated, the rotation center line of the outer rotor 29 is moved to the second position to switch the oil pump 5 to the second running state. Thus, the rotation of the inner rotor 30 and the outer rotor 29 can realize the oil suction of the low-pressure cavity and the oil discharge of the high-pressure cavity, thereby realizing the flow of the lubricating oil. Since the rotation center line of the outer rotor 29 can be moved to the first position or the second position, when the steering direction of the drive gear 19 is changed, the position of the outer rotor 29 is changed accordingly to change the position of the rotation center line of the outer rotor 29, thereby switching the oil pump 5 to the first operation state or the second operation state. Through the technical scheme, the automatic switching of the running state of the oil pump 5 can be realized in the process of changing the steering direction of the driving gear 19, so that a special control device is not required to be arranged, and the structure of the gear box is simplified. In the present embodiment, the oil pump 5 is a gear pump, and the outer rotor 29 and the inner rotor 30 are of a mutually engaged gear structure.

As shown in fig. 5, in the case of the normal rotation of the driving gear 19, the oil pump 5 is in the first operating state, in which the driven gear 3 drives the pump gear 4 to rotate clockwise, the pump gear 4 drives the pump shaft 22 to rotate clockwise, the pump shaft 22 drives the inner rotor 30 to rotate clockwise, and the outer rotor 29 also rotates correspondingly, so that the lubricating oil flows along the preset path. In fig. 5, the rotation center line of the outer rotor 29 is located at the first position (to the left of the rotation center line of the inner rotor 30).

As shown in fig. 6, in the case where the driving gear 19 is reversely rotated, the oil pump 5 is in the second operation state, and in this case, the driven gear 3 drives the pump gear 4 to rotate counterclockwise, the pump gear 4 drives the pump shaft 22 to rotate counterclockwise, the pump shaft 22 drives the inner rotor 30 to rotate counterclockwise, and the outer rotor 29 also rotates accordingly, so that the lubricating oil flows along the preset path. In fig. 6, the rotation center line of the outer rotor 29 is located at the second position (on the right side of the rotation center line of the inner rotor 30).

In this embodiment, the oil delivery assembly further includes: the eccentric ring 28, the holding cavity of the eccentric ring 28 is set up eccentrically to the centre line of rotation of the inner rotor 30, the outer rotor 29 is set up in holding the cavity, there is the first interval between inner wall of the eccentric ring 28 and the outer wall of the outer rotor 29, can drive the eccentric ring 28 to rotate within the predetermined angular range through the friction when the outer rotor 29 rotates; in the case of positive rotation of the driving gear 19, the outer rotor 29 drives the eccentric ring 28 to rotate to and be kept at a first preset position, so that the rotation center line of the outer rotor 29 is limited to the first position through the eccentric ring 28; in the case where the driving gear 19 is reversely rotated, the outer rotor 29 rotates the eccentric ring 28 to and is held at the second predetermined position to define the rotation center line of the outer rotor 29 to the second position by the eccentric ring 28. Since the eccentric ring 28 has a receiving cavity, and the outer rotor 29 is disposed in the receiving cavity, the axial length of the oil pump 5 can be reduced, so that the structure of the oil pump 5 is more compact, and the occupied space is reduced. Moreover, a proper gap is arranged between the outer wall of the outer rotor 29 and the inner wall of the eccentric ring 28, so that the outer rotor 29 can drive the eccentric ring 28 to rotate within a preset angle range through friction force when rotating, the automatic rotation of the eccentric ring 28 is realized, the running state of the oil pump 5 can be automatically switched, and the structure is simple and convenient to operate.

Through the arrangement, when the rotation direction of the driving gear 19 changes, the rotation direction of the outer rotor 29 also changes correspondingly, the outer rotor 29 drives the eccentric ring 28 to rotate and keep at the first preset position or the second preset position through friction force when rotating, so that the position of the eccentrically arranged accommodating cavity of the eccentric ring 28 changes, and as the outer rotor 29 is arranged in the accommodating cavity, the position of the outer rotor 29 changes along with the accommodating cavity of the eccentric ring 28, the position of the rotation center line of the outer rotor 29 is changed, and further the automatic switching of the running state of the oil pump 5 is realized. In this embodiment, the eccentric ring 28 may be rotated 180 degrees. As shown in fig. 5, the eccentric ring 28 is located at a first predetermined position (the receiving cavity of the eccentric ring 28 is offset to the left with respect to the rotation center line of the inner rotor 30). As shown in fig. 6, the eccentric ring 28 is located at a second predetermined position (the receiving cavity of the eccentric ring 28 is offset to the right with respect to the rotation center line of the inner rotor 30).

Furthermore, the eccentric ring 28 is provided with an arc-shaped reversing slot 4-1, the oil delivery assembly further comprises a fixedly arranged limiting member 31, one end of the limiting member 31 is located in the reversing slot 4-1, and the limiting member 31 is used for being matched with a stop at one end of the reversing slot 4-1 to limit the eccentric ring 28 at a first preset position or matched with a stop at the other end of the reversing slot 4-1 to limit the eccentric ring 28 at a second preset position. Therefore, the rotation position of the eccentric ring 28 can be limited through the matching of the reversing slot 4-1 and the limiting piece 31, so that the eccentric ring 28 is limited to the first preset position or the second preset position.

In this embodiment, the oil pump 5 further includes a pump body, the oil inlet 3-1 and the oil outlet 3-2 are both disposed on the pump body, the eccentric ring 28 is rotatably disposed in the pump body, a second gap is formed between an outer wall of the eccentric ring 28 and an inner wall of the pump body, and a size of the second gap is larger than a size of the first gap. The outer rotor 29 is rotatable with respect to the eccentric ring 28 due to a first clearance between the outer wall of the outer rotor 29 and the inner wall of the eccentric ring 28, and the eccentric ring 28 is rotatable with respect to the pump body due to a second clearance between the outer wall of the eccentric ring 28 and the inner wall of the pump body. And because the size of the second clearance is larger than that of the first clearance, the friction force between the outer wall of the outer rotor 29 and the inner wall of the eccentric ring 28 during rotation is larger than that between the outer wall of the eccentric ring 28 and the inner wall of the pump body, so that the outer rotor 29 can drive the eccentric ring 28 to rotate through the friction force during rotation. The arrangement structure is simple and ingenious, and the automatic switching of the running state of the oil pump 5 is realized.

In this embodiment, the oil delivery assembly further includes a pressure plate 25 and an intermediate plate 33, the pressure plate 25 and the intermediate plate 33 are respectively located at two sides of the outer rotor 29, and the pressure plate 25 is used for limiting the axes of the outer rotor 29 and the inner rotor 30. The middle plate 33 is provided with a first arc-shaped hole 2-1 and a second arc-shaped hole 2-2, the first arc-shaped hole 2-1 is communicated with an oil suction port 3-1 of the oil pump 5, the first arc-shaped hole 2-1 is communicated with the low pressure cavity to suck oil, the second arc-shaped hole 2-2 is communicated with the high pressure cavity, and the second arc-shaped hole 2-2 is communicated with an oil outlet 3-2 of the oil pump 5 to discharge oil. Through the arrangement, the arrangement of the oil way is convenient, so that the lubricating oil moves according to the preset path. Moreover, because the first arc-shaped hole 2-1 and the second arc-shaped hole 2-2 are both arc-shaped structures and the sizes of the holes are larger, even if the eccentric position of the outer rotor 29 is changed, the first arc-shaped hole 2-1 can still be ensured to be communicated with the low pressure cavity, and the second arc-shaped hole 2-2 is communicated with the high pressure cavity.

Optionally, the limiting member 31 is a column structure, and the limiting member 31 is disposed on the middle plate 33. Thus, the limiting member 31 is disposed on the intermediate plate 33, so that the oil pump 5 is compact in structure and small in size, and the occupied space of the oil pump 5 is reduced.

When the rotation directions of the driving gear 19 and the driven gear 3 are changed, the rotation direction of the pump shaft 22 is changed, the meshing rotation direction of the inner rotor 30 and the outer rotor 29 is changed, and the eccentric ring 28 rotates 180 degrees under the action of friction force because the eccentric ring 28 and the outer rotor 29 are in small clearance fit, until the other side end face of the reversing slot 4-1 contacts with the limiting piece 31 for stopping. At this time, the rotation center line of the outer rotor 29 also rotates to the other side of the inner rotor 30. Because the offset positions of the inner rotor and the outer rotor and the rotation direction of the gear are changed simultaneously, the area of the first arc-shaped hole 2-1 still forms a low-pressure cavity, the area of the second arc-shaped hole 2-2 still forms a high-pressure cavity, and the flow direction of lubricating oil is kept unchanged.

In this embodiment, the oil pump 5 further includes a pump body, a second bearing 23 and a third bearing 32, the pump body includes a first split body 21, a second split body 27 and a third split body 35 which are connected in sequence, the pump shaft 22 sequentially penetrates through the cavities of the first split body 21, the second split body 27 and the third split body 35, the outer rotor 29 is located in the cavity of the second split body 27, the second bearing 23 is sleeved on the pump shaft 22 and located in the cavity of the first split body 21, and the third bearing 32 is sleeved on the pump shaft 22 and located in the cavity of the third split body 35. In the present embodiment, the pump body can be understood as a housing structure of the oil pump 5.

Optionally, the third bearing 32 is a sliding bearing, a part of the sliding bearing is inserted into the middle plate 33, two second bearings 23 are provided, the two second bearings 23 are separated by the spacer ring 24, the oil suction port 3-1 is located on the third split 35, the oil outlet 3-2 is located on the second split 27, the pressure plate 25 is connected with the first split 21, one side of the second bearing 23 is limited by the elastic retainer ring 26 arranged on the pump shaft 22, and the arrangement can facilitate the arrangement of the structural components.

Optionally, the pump shaft 22 includes a first shaft section, a second shaft section, a third shaft section, a fourth shaft section, a fifth shaft section and a sixth shaft section, which are connected in sequence, wherein the first shaft section penetrates into the pump gear 4, the second shaft section is in limit fit with the end face of the pump gear 4, the third shaft section is in limit fit with the second bearing 23, the fourth shaft section is used for mounting the second bearing 23, the fifth shaft section is used for mounting the inner rotor 30, and the sixth shaft section is used for mounting the third bearing 32. Through the arrangement, the matching and the positioning of different structural parts can be realized. In this embodiment, the diameter of the first bearing is smaller than the diameter of the second shaft section, and the diameters of the second shaft section, the third shaft section, the fourth shaft section, the fifth shaft section and the sixth shaft section decrease in sequence. Optionally, the oil pump 5 further includes a cover plate 34, and the cover plate 34 is connected with the third sub-body 35 to seal off the cavity of the third sub-body 35.

Optionally, as shown in fig. 1, the gearbox further comprises an end cover 9 and a gasket 11, the pump body of the oil pump 5 is connected with the end cover 9, the end cover 9 is connected with the box body 1, and the gasket 11 is arranged between the end cover 9 and the box body 1 to adjust the meshing position of the pump gear 4 of the oil pump 5 and the driven gear 3. The end cover 9 is used for sealing and installing a cavity of the oil pump 5, and the thickness of the gasket 11 can be changed as required so as to adjust the meshing position of the pump gear 4 and the driven gear 3 of the oil pump 5 and assemble the oil pump 5 at a proper position.

Optionally, a first sealing ring 12 is arranged between the oil pump 5 and the inner wall of the box body 1, and the oil pump 5 is sealed by the first sealing ring 12 to avoid lubricating oil leakage.

As shown in fig. 1 and 2, in the present embodiment, the gear box includes an oil suction path 1-1 and an oil discharge path 1-2 provided in a side wall of the box body 1, wherein an inlet of the oil suction path 1-1 communicates with the oil storage area, an outlet of the oil suction path 1-1 communicates with an oil suction port 3-1 of the oil pump 5, an inlet of the oil discharge path 1-2 communicates with an oil discharge port 3-2 of the oil pump 5, and an outlet of the oil discharge path 1-2 is used for supplying oil to a predetermined portion of the transmission assembly. Through the arrangement, the oil way for flowing lubricating oil is arranged in the side wall of the box body 1, so that a special pipeline structure is not required to be installed, the structure of the gear box is simplified, the number of parts is reduced, gears of the gear box are reduced, and the light weight of the gear box is facilitated.

Optionally, as shown in fig. 2, a transition hole is formed in the box body 1, the transition hole is perpendicular to the oil outlet path 1-2, the transition hole is communicated with an inlet of the oil outlet path 1-2, the transition hole is communicated with an oil outlet 3-2 of the oil pump 5, the transition hole has an opening communicated with the outside of the box body 1, and the gearbox further includes a plug 15 for plugging the opening of the transition hole. Through the arrangement, the communication between the oil outlet oil way 1-2 and the oil outlet 3-2 is convenient to realize, the flowing direction of lubricating oil is convenient to change, and the processing is convenient. The plug 15 may be a threaded plug.

In this embodiment, the gearbox further comprises: and the filter element 13 is arranged in the oil suction path 1-1, and the filter element 13 is used for filtering the lubricating oil 18 before entering the oil pump 5. Can filter lubricating oil through filter core 13 to guarantee the cleanness of lubricating oil, prevent that impurity from entering into in the drive assembly and causing the structural wear.

Optionally, a second sealing ring 14 is arranged on the outer wall of the filter element 13, the oil suction line 1-1 comprises a first oil suction section, a second oil suction section and a third oil suction section which are sequentially communicated, wherein the diameter of the second oil suction section is larger than that of the first oil suction section, the filter element 13 is arranged in the second oil suction section, the second oil suction section is provided with an opening communicated with the outside of the box body 1, the third oil suction section is perpendicular to the second oil suction section, and the third oil suction section is communicated with the oil suction port 3-1. Through the arrangement, the oil suction oil path 1-1 is communicated with the oil suction port 3-1 conveniently, the flowing direction of lubricating oil is changed conveniently, and the processing is facilitated. And, the filter core 13 blocks the opening of the second oil suction section communicating with the outside of the box body 1.

In the present embodiment, the gear box further includes an oil spill passage 1-3 provided in the side wall of the case 1, an outlet of the oil outlet passage 1-2 communicates with an inlet of the oil spill passage 1-3 to output the excessive lubricating oil 18 supplied from the oil outlet passage 1-2, and an outlet of the oil spill passage 1-3 communicates with the oil reservoir region to return at least a part of the excessive lubricating oil 18 to the oil reservoir region. The running speed of the driving gear 19 is accelerated, the oil supply amount of the oil pump 5 is correspondingly increased, and when the oil pump 5 supplies excessive lubricating oil, the lubricating oil can flow back to an oil storage area through the oil spilling oil path 1-3, so that excessive lubricating oil is prevented from entering a transmission assembly to cause overlarge pressure. The arrangement improves the reliability and safety of the gearbox. In addition, the oil path for flowing lubricating oil is arranged in the side wall of the box body 1, and a pipeline structure is not required to be specially installed, so that the structure of the gear box is simplified.

In this embodiment, the transmission assembly further includes an input shaft 2, a first bearing 6 and a bearing seat 7, the bearing seat 7 is disposed in the box body 1, the input shaft 2 is rotatably disposed, the first bearing 6 is sleeved on the input shaft 2 and located in the bearing seat 7, the driving gear 19 is disposed on the input shaft 2, and the bearing seat 7 is provided with an oil delivery hole communicated with an outlet of the oil outlet path 1-2, so as to deliver the lubricating oil 18 into the first bearing 6 through the oil delivery hole. The lubricating oil delivered by the oil outlet oil path 1-2 can enter the first bearing 6 by arranging the oil delivery hole, so that the first bearing 6 is lubricated, and the first bearing 6 is ensured to run reliably for a long time.

As shown in fig. 2, in the present embodiment, the oil spilling path 1-3 includes an arc-shaped groove and an oil return hole which are communicated with each other, the arc-shaped groove is communicated with the outlet of the oil outlet path 1-2, the arc-shaped groove is disposed around the bearing seat 7, and the outlet of the oil return hole is communicated with the oil storage area, so that a part of the excessive lubricating oil 18 flows back into the oil storage area; the side wall of the bearing seat 7 is provided with an oil overflow groove 1-5 communicated with the oil overflow oil path 1-3, and the outlet of the oil overflow groove 1-5 is communicated with the oil storage area so as to lead the other part of the excessive lubricating oil 18 to flow back to the oil storage area. Through the arrangement, one part of the lubricating oil entering the oil spilling oil path 1-3 flows back to the oil storage area through the oil return hole, and the other part of the lubricating oil can return to the oil storage area through the oil spilling groove 1-5, so that the lubricating oil can conveniently flow back. Optionally, the number of the oil overflow grooves 1-5 is multiple, the multiple oil overflow grooves 1-5 are arranged at intervals along the circumferential direction of the bearing seat 7, and each oil overflow groove 1-5 is communicated with the arc-shaped groove.

As shown in fig. 1 and 2, the box body 1 includes a first cavity communicated with the main cavity, the bearing seat 7 is disposed in the first cavity, the transmission assembly further includes a sealing cover 10 and a sealing ring 8, the sealing cover 10 is matched with the box body 1 to seal off an opening of the first cavity, and the sealing ring 8 is disposed between the sealing cover 10 and the first bearing 6; the gearbox also comprises an oil return path 1-4 arranged on the inner wall of the first cavity, the bearing seat 7 is provided with an oil return hole, the inlet of the oil return hole is communicated with the area between the sealing cover 10 and the sealing ring 8, the outlet of the oil return hole is communicated with the inlet of the oil return path 1-4, and the outlet of the oil return path 1-4 is communicated with the oil storage area so as to return the lubricating oil 18 between the sealing cover 10 and the sealing ring 8 to the oil storage area. With the above arrangement, the lubricating oil 18 that has entered between the seal cover 10 and the seal ring 8 can be returned to the oil reservoir region to avoid leakage of the lubricating oil. In the present embodiment, the seal ring 8 is a labyrinth structure to improve the sealing property. Optionally, the gearbox further comprises a box cover 16, and the box cover 16 is connected with the box body 1 in a matching mode.

The gear box is internally provided with an oil pump, the flow direction of lubricating oil is not changed along with the steering of the driving gear, and a lubricating oil way is arranged in the box wall and related structures, so that the gear box is compact in overall structure, small in occupied space, light in weight, high in reliability and good in maintainability. Along with the operation of the gear box, the driven gear drives a pump gear of the oil pump to operate to drive the oil pump to work, lubricating oil is sucked from an oil pool at the bottom of the box body, the lubricating oil is filtered by the filter element and conveyed into the bearing seat, the purpose of lubricating the bearing is achieved, and overflowed lubricating oil flows back into the oil pool of the box body. When the vehicle runs in a reversing way, the gear steering is changed, the flow direction of lubricating oil in the oil pump is kept unchanged, and the bearing is always in a good lubricating state.

The oil pump of the gear box is driven by only one small bevel gear, and the oil pump is directly embedded on the box wall, so that the whole structure is simple and compact, the occupied space is small, and the weight is light; the oil pump and the filter element can be disassembled and assembled by disassembling and assembling the screw, the assembly manufacturability is good, the inspection and maintenance operation is convenient, the required working time is short, and the maintainability of the system is good; after the lubricating oil is filtered by the filter element, the working environment of the oil pump and the bearing is clean, the failure risk of the oil pump and the bearing is reduced, the oil way is arranged in the wall of the tank, the pipeline has no risk of loosening and can not collide with other components, and the overall reliability of the system is high; the lubricating system has an oil spilling oil path, so that the oil pressure of a sealing element can be reduced, the leakage risk of lubricating oil is reduced, and the environment is not polluted. The lubricating system is well suitable for the working condition requirements of the rail transit gearbox.

Another embodiment of the invention also provides a railway vehicle, which comprises a gearbox, wherein the gearbox is the gearbox provided above. By using the gear box, the reliability of the railway vehicle can be improved, the weight of the railway vehicle is reduced, the structural arrangement is convenient, and the light weight is realized.

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 lubricating oil storage tank comprises a tank body (1), wherein a main cavity is arranged in the tank body (1), and the bottom of the main cavity is an oil storage area for storing lubricating oil (18);

the transmission assembly comprises a driving gear (19) and a driven gear (3) which are arranged in the box body (1), the driving gear (19) can rotate forwards or backwards, and the driving gear (19) is meshed with the driven gear (3) to drive the driven gear (3) to rotate;

the oil pump (5) is arranged in the box body (1), the oil pump (5) comprises an oil transportation component and a pump gear (4), the oil transportation component is used for sucking oil and discharging oil, the pump gear (4) is in driving connection with the oil transportation component to drive the oil transportation component to run, and the driven gear (3) is meshed with the pump gear (4) to drive the pump gear (4) to rotate;

an oil suction port (3-1) of the oil pump (5) is communicated with the oil storage area to suck lubricating oil (18), and an oil outlet (3-2) of the oil pump (5) is used for supplying oil to a preset part of the transmission assembly to lubricate the preset part;

the oil pump (5) has a first operating state and a second operating state, the lubricating oil (18) flows along the same preset path in the oil pump (5) under the condition that the oil pump (5) is in the first operating state and the oil pump (5) is in the second operating state;

the oil pump (5) is in the first running state under the condition that the driving gear (19) rotates positively, and the oil pump (5) is in the second running state under the condition that the driving gear (19) rotates negatively.

2. The gearbox according to claim 1, characterized in that the transmission assembly further comprises an input shaft (2), a first bearing (6) and an output shaft, the input shaft (2) is rotatably arranged, the first bearing (6) is sleeved on the input shaft (2), the driving gear (19) is arranged on the input shaft (2), the output shaft is rotatably arranged, the driven gear (3) is arranged on the output shaft, and an oil outlet (3-2) of the oil pump (5) is used for conveying lubricating oil (18) to the first bearing (6).

3. The gearbox according to claim 2, characterized in that the box (1) comprises a first cavity and a second cavity respectively communicating with the main cavity, the first bearing (6) being located in the first cavity, the input shaft (2) passing through the first cavity, the oil pump (5) further comprising a pump body, the oil delivery assembly being arranged in the pump body, the pump body being arranged in the second cavity.

4. A gearbox according to claim 1,

the oil delivery assembly comprises a pump shaft (22), an inner rotor (30) and an outer rotor (29), the pump shaft (22) is connected with the pump gear (4), the inner rotor (30) is arranged on the pump shaft (22) and is positioned in a cavity of the outer rotor (29), the rotating center line of the outer rotor (29) is eccentrically arranged relative to the rotating center line of the inner rotor (30), and a low-pressure cavity and a high-pressure cavity are arranged between the outer rotor (29) and the inner rotor (30) to respectively absorb oil and discharge oil;

wherein the rotation center line of the outer rotor (29) has a first position and a second position which are arranged at intervals, and under the condition that the driving gear (19) rotates positively, the rotation center line of the outer rotor (29) moves to the first position to switch the oil pump (5) to the first running state; in the case where the drive gear (19) is reversely rotated, the rotation center line of the outer rotor (29) is moved to the second position to switch the oil pump (5) to the second operation state.

5. The gearbox of claim 4, wherein the oil delivery assembly further comprises:

an eccentric ring (28), wherein a containing cavity of the eccentric ring (28) is eccentrically arranged relative to the rotation center line of the inner rotor (30), the outer rotor (29) is arranged in the containing cavity, a first gap is formed between the outer wall of the outer rotor (29) and the inner wall of the eccentric ring (28), and the outer rotor (29) can drive the eccentric ring (28) to rotate within a preset angle range through friction force when rotating;

under the condition of positive rotation of the driving gear (19), the outer rotor (29) drives the eccentric ring (28) to rotate to and be kept at a first preset position, so that the rotation center line of the outer rotor (29) is limited to the first position through the eccentric ring (28);

under the condition that the driving gear (19) is reversely rotated, the outer rotor (29) drives the eccentric ring (28) to rotate to and be kept at a second preset position, so that the rotating center line of the outer rotor (29) is limited to the second position through the eccentric ring (28).

6. The gearbox according to claim 5, characterized in that the eccentric ring (28) is provided with an arc-shaped reversing slot (4-1), and the oil delivery assembly further comprises a fixedly arranged limiting member (31), one end of the limiting member (31) is positioned in the reversing slot (4-1), and the limiting member (31) is used for being matched with one end stop of the reversing slot (4-1) to limit the eccentric ring (28) at the first preset position or matched with the other end stop of the reversing slot (4-1) to limit the eccentric ring (28) at the second preset position.

7. The gearbox according to claim 5, characterized in that the oil pump (5) further comprises a pump body, the oil intake (3-1) and the oil outlet (3-2) being provided on the pump body, the eccentric ring (28) being rotatably provided within the pump body, a second gap being provided between an outer wall of the eccentric ring (28) and an inner wall of the pump body, the size of the second gap being larger than the size of the first gap.

8. The gearbox according to claim 4, characterized in that the oil delivery assembly further comprises a pressure plate (25) and an intermediate plate (33), the pressure plate (25) and the intermediate plate (33) are respectively located on both sides of the outer rotor (29), wherein the intermediate plate (33) has a first arc-shaped hole (2-1) and a second arc-shaped hole (2-2), the first arc-shaped hole (2-1) is communicated with an oil suction port (3-1) of the oil pump (5), the first arc-shaped hole (2-1) is communicated with the low pressure chamber to suck oil, the second arc-shaped hole (2-2) is communicated with the high pressure chamber, and the second arc-shaped hole (2-2) is communicated with an oil discharge port (3-2) of the oil pump (5) to discharge oil.

9. The gearbox according to claim 4, characterized in that the oil pump (5) further comprises a pump body, a second bearing (23) and a third bearing (32), the pump body comprises a first split body (21), a second split body (27) and a third split body (35) which are connected in sequence, the pump shaft (22) penetrates into the cavities of the first split body (21), the second split body (27) and the third split body (35) in sequence, the outer rotor (29) is located in the cavity of the second split body (27), the second bearing (23) is sleeved on the pump shaft (22) and located in the cavity of the first split body (21), and the third bearing (32) is sleeved on the pump shaft (22) and located in the cavity of the third split body (35).

10. The gearbox according to any one of claims 1 to 9, characterized in that the gearbox comprises an oil suction line (1-1) and an oil outlet line (1-2) arranged in a side wall of the casing (1), wherein an inlet of the oil suction line (1-1) communicates with the oil storage area, an outlet of the oil suction line (1-1) communicates with an oil suction port (3-1) of the oil pump (5), an inlet of the oil outlet line (1-2) communicates with an oil outlet (3-2) of the oil pump (5), and an outlet of the oil outlet line (1-2) is used for supplying oil to a predetermined part of the transmission assembly.

11. The gearbox as set forth in claim 10, further comprising:

and the filter element (13) is arranged in the oil suction oil way (1-1), and the filter element (13) is used for filtering the lubricating oil (18) before entering the oil pump (5).

12. The gearbox according to claim 10, characterized in that the gearbox further comprises an oil spill passage (1-3) provided in a side wall of the casing (1), an outlet of the oil discharge passage (1-2) communicating with an inlet of the oil spill passage (1-3) to output excess lubricating oil (18) supplied by the oil discharge passage (1-2), an outlet of the oil spill passage (1-3) communicating with the oil reservoir to return at least a part of the excess lubricating oil (18) to the oil reservoir.

13. A gearbox according to claim 12, characterised in that the transmission assembly further comprises an input shaft (2), a first bearing (6) and a bearing seat (7), the bearing seat (7) is arranged in the casing (1), the input shaft (2) is rotatably arranged, the first bearing (6) is sleeved on the input shaft (2) and is positioned in the bearing seat (7), the driving gear (19) is arranged on the input shaft (2), and the bearing seat (7) is provided with an oil delivery hole communicated with the outlet of the oil delivery path (1-2) so as to deliver the lubricating oil (18) into the first bearing (6) through the oil delivery hole.

14. A gearbox according to claim 13,

the oil spilling oil way (1-3) comprises an arc-shaped groove and an oil return hole which are communicated with each other, the arc-shaped groove is communicated with an outlet of the oil outlet oil way (1-2), the arc-shaped groove is arranged around the bearing seat (7), and an outlet of the oil return hole is communicated with the oil storage area, so that a part of the excessive lubricating oil (18) flows back to the oil storage area;

and an oil spilling groove (1-5) communicated with the oil spilling oil path (1-3) is formed in the side wall of the bearing seat (7), and an outlet of the oil spilling groove (1-5) is communicated with the oil storage area so that the other part of the excessive lubricating oil (18) flows back into the oil storage area.

15. A gearbox according to claim 13,

the box body (1) comprises a first cavity communicated with the main cavity, the bearing seat (7) is arranged in the first cavity, the transmission assembly further comprises a sealing cover (10) and a sealing ring (8), the sealing cover (10) is matched with the box body (1) to seal an opening of the first cavity, and the sealing ring (8) is arranged between the sealing cover (10) and the first bearing (6);

the gearbox is still including setting up oil return circuit (1-4) on the inner wall of first cavity, the oil gallery has on bearing frame (7), the entry of oil gallery with sealed lid (10) with regional intercommunication between sealing ring (8), the export of oil gallery with the entry intercommunication of oil return circuit (1-4), the export of oil return circuit (1-4) with the oil storage district intercommunication, with sealed lid (10) with lubricating oil (18) between sealing ring (8) flow back in the oil storage district.

16. A rail vehicle comprising a gearbox, characterized in that the gearbox is a gearbox according to any one of claims 1-15.