CN115978171A - Gear box oil return sealing structure, gear box and gear box oil return method - Google Patents
Gear box oil return sealing structure, gear box and gear box oil return method Download PDFInfo
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- CN115978171A CN115978171A CN202211652041.XA CN202211652041A CN115978171A CN 115978171 A CN115978171 A CN 115978171A CN 202211652041 A CN202211652041 A CN 202211652041A CN 115978171 A CN115978171 A CN 115978171A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The application provides a gearbox oil return sealing structure, a gearbox and a gearbox oil return method. The oil return sealing structure comprises a box body, a shaft body, an oil retainer ring, a bearing, an oil slinger and a sealing assembly, wherein the shaft body is rotatably matched with the box body, and the oil retainer ring, the bearing and the oil slinger are all sleeved outside the shaft body and are sequentially abutted; the sealing assembly comprises a first labyrinth through cover and a second labyrinth through cover which are connected with the oil slinger and the box body simultaneously, a first oil return cavity is formed between the first labyrinth through cover and the bearing, and an oil-gas separation cavity is defined by the first labyrinth through cover and the box body together; the first labyrinth transparent cover, the second labyrinth transparent cover and the box body jointly define a second oil return cavity communicated with the oil-gas separation cavity; the box is equipped with inlet port, first oil return hole and second oil return hole, and first oil return hole communicates first oil return chamber, and the second oil return hole communicates the oil-gas separation chamber. The gear box has good sealing performance and is not easy to leak oil in the running process.
Description
Technical Field
The invention relates to the field of gearboxes, in particular to a gearbox oil return sealing structure, a gearbox and a gearbox oil return method.
Background
The input shaft and the output shaft of the gear box generally need to be provided with seals to prevent lubricating media from leaking, and the conventional contact type seals (such as felt rings, lip-shaped seal rings, V-shaped seal rings and the like) have good sealing performance but relatively short service life; the non-contact mechanical labyrinth seal structure has longer service life, stability and reliability, but poor sealing performance.
In the track traffic gear box field, for satisfying the requirement of long-life, high reliability, multistage non-contact mechanical labyrinth seal structure is generally adopted in the sealed shafting of present stage, for obtaining better sealing performance, generally through increasing the maze group number, its shortcoming is to occupy axial space, and the structure is complicated, because of the increase of maze group number, gear box internal pressure also can increase again, and this need set up ventilative cap release gear box again and press and assist multiunit maze structure to exert its sealed performance. Rail transit gearboxes are limited by design space, often requiring a trade-off between sealing performance and axial space.
The inventor researches and discovers that the existing gearbox sealing structure has the following defects:
under design requirements such as energy-concerving and environment-protective, the design unsprung space of new motorcycle type is compacter more, and the gear box generally adopts two sets of labyrinth seals, can realize the pressure release effect of ventilative cap, plays the sealing function of gear box again, but sealing performance generally is difficult to reach the design requirement, has the risk of oil gas leakage among the gear box operation process, adsorbs more putty at the labyrinth mouth, the polluted environment, influences user's experience.
Disclosure of Invention
The invention aims to provide a gearbox oil return sealing structure, a gearbox and a gearbox oil return method, which can improve the sealing performance of a shafting sealing structure on the premise of not arranging an air permeable cap.
The embodiment of the invention is realized by the following steps:
in a first aspect, the present invention provides a gearbox oil return sealing structure, including:
the oil slinger, the bearing and the oil slinger are sleeved outside the shaft body and are sequentially abutted; the sealing assembly comprises a first labyrinth cover and a second labyrinth cover which are simultaneously connected with the oil slinger and the box body, the first labyrinth cover and the oil slinger are matched to form a first sealing gap, and the second labyrinth cover and the oil slinger are matched to form a second sealing gap; a first oil return cavity is formed between the first labyrinth through cover and the bearing, and an oil-gas separation cavity is defined by the first labyrinth through cover and the box body together; the first labyrinth transparent cover, the second labyrinth transparent cover and the box body jointly define a second oil return cavity communicated with the oil-gas separation cavity; the oil-gas separation box is characterized in that the box body is provided with an oil inlet hole, a first oil return hole and a second oil return hole, the first oil return hole is communicated with the first oil return cavity, and the second oil return hole is communicated with the oil-gas separation cavity.
In an optional implementation manner, the first labyrinth through cover is provided with an air outlet and a third oil return hole which are communicated with the oil-gas separation cavity, and the air outlet is higher than the third oil return hole.
In an optional embodiment, the first labyrinth through cover comprises an annular body and a sealing ring body which are of an integrated structure, the annular body is abutted with an outer ring end face of the bearing and the box body, the sealing ring body is matched with the oil slinger to form the first sealing gap, and the first oil return cavity is formed between the sealing ring body and the bearing; the annular body and the box body jointly define the oil-gas separation cavity;
the air outlet and the third oil return hole are both arranged on the annular body.
In an alternative embodiment, a groove is arranged on the end face of the annular body close to the bearing, and the oil-gas separation cavity is formed at the groove; the air outlet and the third oil return hole are formed in the groove bottom wall of the groove.
In an alternative embodiment, the sealing ring body is spaced apart from the groove bottom wall of the groove in the axial direction of the annular body, and the sealing ring body is located on a side of the groove bottom wall of the groove close to the bearing.
In an alternative embodiment, the axis of the second oil return hole, the axis of the gas outlet hole and the axis of the third oil return hole are not collinear.
In an optional implementation manner, the box body is further provided with a throttle hole, the throttle hole is communicated with one end, away from the oil-gas separation cavity, of the second oil return hole, and the aperture of the throttle hole is smaller than that of the second oil return hole.
In an alternative embodiment, the number of the oil-gas separation chamber, the second oil return hole or the throttle hole is plural.
In a second aspect, the present invention provides a gearbox comprising:
the gearbox oil return sealing structure of any one of the preceding embodiments.
In a third aspect, the present invention provides a gearbox oil return method, which is applied to the gearbox according to the foregoing embodiment, and includes:
lubricating oil entering from the oil inlet hole lubricates the bearing and then flows back into the box body through the first oil return cavity and the first oil return hole;
the oil-gas mixture splashed in the box body enters the oil-gas separation cavity through the throttling hole and the second oil return hole, and the separated gas enters the second oil return cavity and is discharged out of the box body through the second sealing gap; and after the gas enters the second oil return cavity, lubricating oil in the second oil return cavity flows back to the oil-gas separation cavity under the action of gravity, and the lubricating oil in the oil-gas separation cavity flows back to the box body through the second oil return hole.
The embodiment of the invention has the beneficial effects that:
in summary, the oil-gas separation cavity is arranged in the oil-gas return sealing structure of the gear box provided by the embodiment, in the operation process of the gear box, lubricating oil firstly enters the first oil return cavity and then flows back into the box body through the first oil return hole. Part of the oil-gas mixture enters the second oil return cavity through a gap between the first labyrinth through cover and the oil slinger. In the prior art, an oil-gas mixture in the box body splashes from the second oil return hole and enters the second oil return cavity, so that the oil-gas mixture directly impacts the labyrinth seal structure, and lubricating oil escapes along with gas, and the lubricating oil is leaked. In this embodiment, under the effect of splashing, the oil-gas mixture in the box does not directly enter the second oil return cavity, but passes through the orifice first, the second oil return hole enters the oil-gas separation chamber, in the oil-gas separation chamber, most oil-gas separation is realized, that is, the content of lubricating oil in the gas is greatly reduced, the separated gas enters the second oil return cavity, the separated lubricating oil is accumulated in the oil-gas separation chamber, and take the lubricating oil in the oil-gas separation chamber to flow back to the box body through the second oil return hole together, the amount of lubricating oil in the second oil return cavity is reduced, the lubricating oil that the gas carries when being discharged out of the box body from the second oil return cavity is few, effectively reduce the oil-gas leakage risk when realizing the pressure relief of the gear box.
Simultaneously, the gear box oil return seal structure that this embodiment provided still possesses following advantage:
1. the structure with the oil-gas separation function is added at the outlet of the oil return oil path, namely the oil-gas separation cavity is arranged, the gas outlet hole and the oil return hole are independent, so that the gas in the gas outlet hole of the oil-gas separation cavity is prevented from being impacted and mixed with the lubricating oil in the second oil return cavity, the lubricating oil content in the oil gas at the inlet of the labyrinth seal is reduced, and the oil-gas leakage risk is effectively reduced while the pressure relief of the gearbox is realized;
2. an orifice is arranged at the inlet of the oil return path, so that the pressure of oil gas which is back-flushed into the oil return cavity in the box body is reduced, the pressure of the inlet of the labyrinth seal structure is reduced, and the risk of oil gas leakage is effectively reduced;
3. the oil-gas separation cavity and the throttling hole are reasonably combined by the oil-return sealing structure, so that the oil-gas separation cavity occupies a small space, the size of the throttling hole can be adjusted, and the number of the oil-return sealing structures can be combined, so that the requirements of different design parameters (such as power, speed, operation working conditions and the like) of the gearbox can be met;
4. the oil return sealing structure is integrated on the existing conventional part, does not need to add a new part, and is simple and reliable in structure and low in cost.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic cross-sectional structural view of a gearbox oil return seal structure according to an embodiment of the invention;
FIG. 2 is a partial structural schematic view of a gearbox oil return sealing structure according to an embodiment of the invention;
FIG. 3 is a schematic cross-sectional view of a first oil return hole of the oil return sealing structure of the gearbox according to the embodiment of the invention;
FIG. 4 is a schematic cross-sectional structural view of yet another perspective of a gearbox oil return seal structure in accordance with an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of an orifice and a second oil return hole in the case according to the embodiment of the present invention;
FIG. 6 is a schematic structural view of a variation of the oil return sealing structure of the gearbox according to the embodiment of the invention;
fig. 7 is a schematic structural view of another modification of the oil return sealing structure of the gearbox according to the embodiment of the invention.
An icon:
001-a first oil return cavity; 002-oil-gas separation chamber; 003-a second oil return cavity; 100-a box body; 110-a first oil return hole; a 120-orifice; 130-a second oil return hole; 140-oil inlet hole; 200-shaft body; 300-slinger; 400-a bearing; 500-oil slinger; 600-a seal assembly; 610-a first labyrinth cover; 611-a ring-shaped body; 612-a sealing ring body; 613-air outlet holes; 614-third oil return hole; 615-oil return tank; 616-grooves; 620-second labyrinth cover.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. 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.
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, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Examples
Referring to fig. 1 to 3, in fig. 2, a dotted line with an arrow indicates a flow path of the lubricant, and a solid line with an arrow indicates a flow path of the gas. In this embodiment, the oil return sealing structure of the gearbox includes a box 100, a shaft body 200, an oil slinger 300, a bearing 400, an oil slinger 500 and a sealing assembly 600. The shaft body 200 is rotatably engaged with the casing 100, and the slinger 300, the bearing 400 and the slinger 500 are all sleeved outside the shaft body 200 and are sequentially abutted. The seal assembly 600 includes a first labyrinth cover 610 and a second labyrinth cover 620 both connected to the oil slinger 500 and the tank 100, the first labyrinth cover 610 cooperating with the oil slinger 500 to form a first seal gap, and the second labyrinth cover 620 cooperating with the oil slinger 500 to form a second seal gap. The first labyrinth cover 610 forms a first seal with the oil slinger 500 and the second labyrinth cover 620 forms a labyrinth structure with the oil slinger 500 as a second seal. A first oil return cavity 001 is formed between the first labyrinth through cover 610 and the bearing 400, and the first labyrinth through cover 610 and the box body 100 jointly define an oil-gas separation cavity 002. The first labyrinth through cover 610, the second labyrinth through cover 620 and the box 100 together define a second oil return cavity 003 which is in communication with the oil-gas separation cavity 002. The box 100 is provided with an oil inlet hole 140, a first oil return hole 110 and a second oil return hole 130, the first oil return hole 110 is communicated with a first oil return cavity 001, and the second oil return hole 130 is communicated with an oil-gas separation cavity 002.
The working principle of the oil return sealing structure of the gearbox provided by the embodiment is as follows:
during the operation of the gearbox, the lubricating oil firstly enters the first oil return cavity 001 and then returns to the box body 100 through the first oil return hole 110. Part of the oil-air mixture enters the second oil return chamber 003 through the gap between the first labyrinth cover 610 and the oil slinger 500. Under the splash action, the oil-gas mixture in the box 100 does not directly enter the second oil return cavity 003, but firstly passes through the orifice 120, the second oil return hole 130 enters the oil-gas separation cavity 002, in the oil-gas separation cavity 002, most of the oil-gas mixture realizes the separation, namely, the content of lubricating oil in the gas is greatly reduced, the separated gas enters the second oil return cavity 003, the separated lubricating oil is accumulated in the oil-gas separation cavity 002, and the lubricating oil in the oil-gas separation cavity 002 is taken along to flow back into the box 100 through the second oil return hole 130, the lubricating oil quantity in the second oil return cavity 003 is reduced, the lubricating oil carried when the gas is discharged out of the box 100 from the second oil return cavity 003 is less, the oil-gas leakage risk is effectively reduced while the pressure relief of the gear box is realized. And the amount of the returned lubricating oil is large, the amount of the lubricating oil participating in lubrication is large, all parts can be effectively lubricated in the running process of the gear box, and the running stability of the gear box is high.
And in prior art, under the effect of splashing, the oil-gas mixture in the box 100 can directly enter into second oil return chamber 003 from second oil return hole 130 in to hinder the lubricating oil in second oil return chamber 003 to flow back to in the box 100, the oil-gas mixture in the second oil return chamber 003 increases gradually, when atmospheric pressure is great, gas in the oil-gas mixture can spill over from second maze penetrating cover 620, and because the lubricating oil backward flow in the second oil return chamber 003 is obstructed, the lubricating oil volume is big, the lubricating oil volume along with gas escape is more, thereby cause lubricating oil to leak.
Referring to fig. 2, in the present embodiment, optionally, the first labyrinth cover 610 includes an annular body 611 and a sealing ring body 612, which are of an integral structure, the sealing ring body 612 is located inside the annular body 611, the sealing ring body 612 is sleeved outside the oil slinger 500, and the two cooperate to form a first sealing gap, and an annular surface of the sealing ring body 612, which is far away from the annular body 611, cooperates with the oil slinger 500 to form a first seal. One end surface of the ring body 611 is sealingly engaged with the outer ring of the bearing 400, and the outer ring surface of the ring body 611 facing away from the seal ring body 612 abuts against the housing 100. Annular body 611, seal ring body 612, oil slinger 500 and bearing 400 together define a first oil return chamber 001 and annular body 611 and housing 100 together define a second oil return chamber 003.
Referring to fig. 2-4, an oil return groove 615 and a groove 616 are disposed on an end surface of the annular body 611 near the bearing 400. The oil return grooves 615 and the grooves 616 are arranged at intervals in the circumferential direction of the ring body 611. The oil return groove 615 is a through groove in the radial direction of the ring body 611, and the lubricating oil in the first oil return chamber 001 is introduced into the first oil return hole 110 through the oil return groove 615. The groove 616 extends along the axial direction of the annular body 611, and the groove bottom wall of the groove 616 is located on one side of the sealing ring body 612 far away from the bearing 400, that is, the sealing ring body 612 is located on one side of the groove bottom wall of the groove 616 close to the bearing 400, so that the oil-gas separation cavity 002 is formed at the groove 616, the structure of the annular body 611 is reasonably utilized, no additional space is needed to form the oil-gas separation cavity 002, the whole structure is compact, the size is small, and therefore the oil-gas separation function can be achieved in a limited space. Meanwhile, the groove 616 is open at the radial outward side of the annular body 611, so that the volume of the oil-gas separation cavity 002 is further increased, the storage capacity of the oil-gas separation cavity 002 is enhanced, and oil-gas separation can be better realized. Further, a groove bottom wall of the groove 616 is provided with a gas outlet hole 613 and a third oil return hole 614. The air outlet holes 613 may be circular holes, and the number thereof is set as required. Part of the hole wall of the third oil return hole 614 is located on the box body 100, that is, a notch may be formed on the bottom wall of the groove 616, and after the ring body 611 is assembled to the box body 100, the box body 100 closes the notch, so that the third oil return hole 614 is formed at the notch, and by adopting the design, a blocking step is not formed at the third oil return hole 614, and the lubricating oil in the second oil return cavity 003 is not easily influenced to enter the oil-gas separation cavity 002 through the third oil return hole 614. The height of the air outlet 613 is higher than that of the third oil return hole 614.
The oil-gas mixture enters the second oil return hole 130 under the splashing action and then enters the oil-gas separation cavity 002, the oil-gas separation cavity 002 is large in size, the speed of the oil-gas mixture is reduced, under the action of gravity, the oil-gas mixture is separated, namely, lubricating oil is located at the lower layer, and gas is located at the upper layer, meanwhile, the height of the gas outlet 613 is higher than that of the third oil return hole 614, gas located at the upper layer enters the second oil return cavity 003 from the gas outlet 613 and firstly fills the upper space of the second oil return cavity 003, and along with the increase of gas in the second oil return cavity 003, the pressure in the second oil return cavity 003 is increased, the second oil return cavity 003 and the oil-gas separation cavity 002 form a gas pressure difference, so that the lubricating oil at the bottom of the second oil return cavity 003 enters the oil-gas separation cavity 002 through the third oil return hole 614, and the lubricating oil further flows back into the box body 100 from the oil-gas separation cavity 002 through the second oil return hole 130, the lubricating oil in the second oil return cavity is reduced, and when the gas escapes, little lubricating oil is carried and the lubricating oil is not easy to leak. Meanwhile, due to the design of the third oil return hole 614, the second oil return cavity 003 can effectively discharge air, and meanwhile, the air flow does not impact lubricating oil in the second oil return cavity 003 any more, so that secondary mixing of oil and gas is avoided, oil and gas separation is further ensured, and the oil and gas separation effect is improved.
Optionally, the second oil return hole 130 is provided in the box 100, one end of the second oil return hole is communicated with the inside of the box 100, and the other end of the second oil return hole is communicated with the oil-gas separation cavity 002, the second oil return hole 130 and the air outlet 613, and the second oil return hole 130 and the third oil return hole 614 are not in the same path, so that a lubricating oil mixture entering the oil-gas separation cavity 002 through the recoil of the second oil return hole 130 does not directly enter the air outlet 613 and the third oil return hole 614, and further does not directly enter the second oil return cavity 003, but collides with a wall surface forming the oil-gas separation cavity 002, thereby achieving sufficient separation of oil droplet-shaped lubricating oil in the oil-gas mixture in the oil-gas separation cavity 002 under the action of gravity, and the separated lubricating oil can flow back into the box 100 through the second oil return hole 130, thereby reducing the content of the lubricating oil in the second oil return cavity 003. In other words, the axis of the second oil return hole, the axis of the gas outlet hole and the axis of the third oil return hole are not collinear, that is, the axis of the second oil return hole, the axis of the gas outlet hole and the axis of the third oil return hole can be parallel or intersected; or the axis of the second oil return hole, the axis of the air outlet hole and the axis of the third oil return hole are not in the same plane.
For example, the extending direction of the second oil return hole 130 intersects with the bottom wall of the groove 616, and meanwhile, the projection of the second oil return hole 130 on the bottom wall of the groove in the extending direction is staggered with the gas outlet hole 613 and the third oil return hole 614, that is, the oil outlet path of the second oil return hole 130 is staggered with the gas outlet hole 613 and the third oil return hole 614.
Alternatively, in other embodiments, the second oil return hole 130 may be disposed parallel to the bottom wall of the tank.
Alternatively, in other embodiments, the second oil return hole 130 may direct the oil-gas mixture into the oil-gas separation chamber 002 in a direction away from the tank bottom wall.
Referring to fig. 4 and fig. 5, in the present embodiment, optionally, the tank 100 is further provided with an orifice 120, the orifice 120 communicates with one end of the second oil return hole 130 far away from the oil-gas separation cavity 002, and a bore diameter of the orifice 120 is smaller than a bore diameter of the second oil return hole 130. That is, the aperture of the throttle hole 120 is φ d2, and the space of the second oil return hole 130 is φ d1, φ d1 > φ d2.
Referring to fig. 6-7, by providing the throttle hole 120, the throttle hole 120 can reduce the pressure of oil gas which backflushes into the second oil return hole 130 in the tank body, thereby reducing the pressure at the inlet of the second labyrinth transparent cover 620 and reducing the risk of oil gas leakage. It should be understood that, according to the operating condition of the gearbox, a plurality of sets of oil-return sealing structures may be arranged in the circumferential direction of the shafting, and the number of the oil-gas separation cavity 002, the second oil-return hole 130 and the throttle hole 120 may be plural, and may be set as required, for example, one oil-gas separation cavity 002 is combined with one throttle hole 120, or one oil-gas separation cavity 002 is combined with a plurality of throttle holes 120, and according to different design parameters of the gearbox, the oil-return sealing structures and the size may be calculated and determined in the stage of the gearbox design.
The gear box oil return sealing structure provided by the embodiment realizes oil-gas separation before the oil-gas mixture enters the second oil return cavity 003, so that the content of lubricating oil in the second oil return cavity 003 is greatly reduced, and the risk of oil leakage is reduced.
The embodiment also provides a gearbox, which comprises the gearbox oil return sealing structure, and the gearbox is high in reliability and low in operation cost in the operation process.
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 (9)
1. A gearbox oil return sealing structure is characterized by comprising:
the oil slinger, the bearing and the oil slinger are sleeved outside the shaft body and are sequentially abutted; the sealing assembly comprises a first labyrinth-through cover and a second labyrinth-through cover which are simultaneously connected with the oil slinger and the box body, the first labyrinth-through cover and the oil slinger are matched to form a first sealing gap, and the second labyrinth-through cover and the oil slinger are matched to form a second sealing gap; a first oil return cavity is formed between the first labyrinth through cover and the bearing, and an oil-gas separation cavity is defined by the first labyrinth through cover and the box body together; the first labyrinth through cover, the second labyrinth through cover and the box body jointly define a second oil return cavity communicated with the oil-gas separation cavity; the oil-gas separation tank is characterized in that the tank body is provided with an oil inlet hole, a first oil return hole and a second oil return hole, the first oil return hole is communicated with the first oil return cavity, and the second oil return hole is communicated with the oil-gas separation cavity.
2. The gearbox oil return seal structure of claim 1, wherein:
and the first labyrinth through cover is provided with an air outlet and a third oil return hole which are communicated with the oil-gas separation cavity, and the air outlet is higher than the third oil return hole.
3. The gearbox oil return seal structure of claim 2, wherein:
the first labyrinth transparent cover comprises an annular body and a sealing ring body which are of an integrated structure, the annular body is abutted against the outer ring end face of the bearing and the box body, the sealing ring body is matched with the oil slinger to form the first sealing gap, and the first oil return cavity is formed between the sealing ring body and the bearing; the annular body and the box body jointly define the oil-gas separation cavity;
the air outlet and the third oil return hole are both arranged on the annular body.
4. The gearbox oil return seal structure of claim 3, wherein:
a groove is formed in the end face, close to the bearing, of the annular body, and the oil-gas separation cavity is formed in the groove; the air outlet and the third oil return hole are formed in the bottom wall of the groove.
5. The gearbox oil return sealing structure of claim 2, wherein:
and the axis of the second oil return hole, the axis of the air outlet hole and the axis of the third oil return hole are not collinear.
6. The gearbox oil return seal structure of claim 1, wherein:
and the box body is also provided with a throttling hole, the throttling hole is communicated with one end, far away from the oil-gas separation cavity, of the second oil return hole, and the aperture of the throttling hole is smaller than that of the second oil return hole.
7. The gearbox oil return sealing structure of claim 6, wherein:
the number of the oil-gas separation cavities, the second oil return holes or the throttling holes is multiple.
8. A gearbox, comprising:
gearbox oil return seal structure as claimed in any one of claims 1-7.
9. A method of gearbox oil return, the method being adapted for use in a gearbox according to claim 8, the method comprising:
lubricating oil entering from the oil inlet hole lubricates the bearing and then flows back into the box body through the first oil return cavity and the first oil return hole;
the oil-gas mixture splashed in the box body enters the oil-gas separation cavity through the throttling hole and the second oil return hole, and the separated gas enters the second oil return cavity and is discharged out of the box body through the second sealing gap; and after the gas enters the second oil return cavity, lubricating oil in the second oil return cavity flows back into the oil-gas separation cavity under the action of gravity, and the lubricating oil in the oil-gas separation cavity flows back into the box body through the second oil return hole.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211652041.XA CN115978171B (en) | 2022-12-21 | 2022-12-21 | Gear box oil return sealing structure, gear box and gear box oil return method |
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| CN202211652041.XA CN115978171B (en) | 2022-12-21 | 2022-12-21 | Gear box oil return sealing structure, gear box and gear box oil return method |
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| CN115978171A true CN115978171A (en) | 2023-04-18 |
| CN115978171B CN115978171B (en) | 2023-09-01 |
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Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201666377U (en) * | 2010-03-31 | 2010-12-08 | 南京高速齿轮制造有限公司 | Oil seal arranged between gear case body and shaft |
| CN201763934U (en) * | 2010-03-31 | 2011-03-16 | 南京高速齿轮制造有限公司 | Gear box used for track transportation vehicle |
| CN202451792U (en) * | 2012-02-22 | 2012-09-26 | 天津市祥威传动设备有限公司 | High speed class combined seal oil return mechanism in main wind power gear box |
| CN103671852A (en) * | 2012-09-13 | 2014-03-26 | 南车戚墅堰机车车辆工艺研究所有限公司 | High-speed gearbox sealing device and high-speed gearbox with same |
| CN203560407U (en) * | 2013-11-20 | 2014-04-23 | 北京南口轨道交通机械有限责任公司 | Non-contact sealing structure for gearbox and gearbox |
| JP2016156462A (en) * | 2015-02-25 | 2016-09-01 | 新日鐵住金株式会社 | Non-contact seal device for gear device for railroad vehicle |
| CN206398051U (en) * | 2016-12-06 | 2017-08-11 | 江苏昊克传动科技股份有限公司 | The oily component of high-mechanic integrated gear case input axle bumper |
| CN207093775U (en) * | 2017-08-02 | 2018-03-13 | 南京高速齿轮制造有限公司 | A kind of shaft end labyrinth seal structure |
| CN207470781U (en) * | 2017-08-02 | 2018-06-08 | 南京高速齿轮制造有限公司 | A kind of rotation sealing structure of shaft end |
| CN215257752U (en) * | 2021-06-15 | 2021-12-21 | 中车青岛四方机车车辆股份有限公司 | Labyrinth seal structure, gear box and rail vehicle |
| CN216742723U (en) * | 2022-02-24 | 2022-06-14 | 南京安维士传动技术股份有限公司 | Wind-powered electricity generation gear box output shaft seal structure |
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2022
- 2022-12-21 CN CN202211652041.XA patent/CN115978171B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201666377U (en) * | 2010-03-31 | 2010-12-08 | 南京高速齿轮制造有限公司 | Oil seal arranged between gear case body and shaft |
| CN201763934U (en) * | 2010-03-31 | 2011-03-16 | 南京高速齿轮制造有限公司 | Gear box used for track transportation vehicle |
| CN202451792U (en) * | 2012-02-22 | 2012-09-26 | 天津市祥威传动设备有限公司 | High speed class combined seal oil return mechanism in main wind power gear box |
| CN103671852A (en) * | 2012-09-13 | 2014-03-26 | 南车戚墅堰机车车辆工艺研究所有限公司 | High-speed gearbox sealing device and high-speed gearbox with same |
| CN203560407U (en) * | 2013-11-20 | 2014-04-23 | 北京南口轨道交通机械有限责任公司 | Non-contact sealing structure for gearbox and gearbox |
| JP2016156462A (en) * | 2015-02-25 | 2016-09-01 | 新日鐵住金株式会社 | Non-contact seal device for gear device for railroad vehicle |
| CN206398051U (en) * | 2016-12-06 | 2017-08-11 | 江苏昊克传动科技股份有限公司 | The oily component of high-mechanic integrated gear case input axle bumper |
| CN207093775U (en) * | 2017-08-02 | 2018-03-13 | 南京高速齿轮制造有限公司 | A kind of shaft end labyrinth seal structure |
| CN207470781U (en) * | 2017-08-02 | 2018-06-08 | 南京高速齿轮制造有限公司 | A kind of rotation sealing structure of shaft end |
| CN215257752U (en) * | 2021-06-15 | 2021-12-21 | 中车青岛四方机车车辆股份有限公司 | Labyrinth seal structure, gear box and rail vehicle |
| CN216742723U (en) * | 2022-02-24 | 2022-06-14 | 南京安维士传动技术股份有限公司 | Wind-powered electricity generation gear box output shaft seal structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115978171B (en) | 2023-09-01 |
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