CN219954150U - Shaft assembly, gearbox, and gas turbine engine - Google Patents

Abstract

The utility model relates to a shaft assembly, a gear box and a gas turbine engine. Wherein the shaft assembly comprises a shaft defining a bearing mounting region between a first position and a second position along a length of the shaft; the bearing is correspondingly arranged in the bearing installation area and comprises an inner ring and an outer ring, the inner ring is connected with the shaft, and the outer ring is connected with the bearing seat; the shaft is a hollow shaft, a first groove and a second groove are formed in the inner wall surface of the shaft, the second groove is provided with a through hole, the through hole is communicated with the inner wall surface of the shaft and the outer wall surface of the shaft, the through hole is located in the range of the bearing installation area, and the first groove is located on the upstream side of the second groove in the axial direction.

Description

Shaft assembly, gearbox, and gas turbine engine

Technical Field

The utility model relates to a shaft assembly, a gearbox and a gas turbine engine.

Background

Bearings are a widely used mechanical part, such as a gearbox for a gas turbine engine. The main functions of the bearing include, but are not limited to, transferring load, supporting rotation of the rotor member, etc., the inner ring is typically secured to the rotor member (e.g., shaft) by interference and a lock nut, and the outer ring is secured to the bearing housing by the lock nut.

The bearing needs to be lubricated in the working process, but because of the internal structure and space of the gear box, lubricating oil after lubrication enters the bearing (for short, secondary lubrication), particularly the bearing positioned on an oil return path of the gear box, the secondary lubrication lubricating oil often contains a certain amount of metal scraps, and if the metal scraps enter the bearing along with the lubricating oil, the service life of the bearing is greatly threatened, so that the safety of an engine is influenced.

There is therefore a need in the art for a shaft assembly, gearbox, gas turbine engine to increase the life of the bearings, ensure reliable operation of the gearbox, and safety of the gas turbine engine.

Disclosure of Invention

The present utility model is directed to a shaft assembly.

The utility model also aims to provide a gear box.

It is also an object of the present utility model to provide a gas turbine engine.

The technical problem to be solved by the utility model is that the service life of the bearing is prolonged, and the reliable operation of the gear box and the safety of the gas turbine engine are ensured.

A shaft assembly according to a first aspect of the present utility model includes a shaft defining a bearing mounting region between a first position to a second position in a length direction of the shaft; the bearing is correspondingly arranged in the bearing installation area and comprises an inner ring and an outer ring, the inner ring is connected with the shaft, and the outer ring is connected with the bearing seat; the shaft is a hollow shaft, a first groove and a second groove are formed in the inner wall surface of the shaft, the second groove is provided with a through hole, the through hole is communicated with the inner wall surface of the shaft and the outer wall surface of the shaft, the through hole is located in the range of the bearing installation area, and the first groove is located on the upstream side of the second groove in the axial direction.

The shaft assembly described in the above embodiment, by the arrangement of the first groove, the second groove, and the through hole, the lubrication oil flowing from the inside of the shaft to the bearing can flow along the first lubrication oil path: through the first groove on the inner wall surface of the shaft, the lubricating oil is accumulated on the inner wall surface of the first groove under the action of centrifugal force, and after the lubricating oil is filled in the first groove, the lubricating oil flows through the first groove, enters the second groove on the inner wall surface of the shaft, and passes through the through hole in the second groove to the bearing. This prevents the bearing from being contaminated by metal chips of the lubricating oil flowing from the inside of the shaft to the bearing during the secondary lubrication.

In one or more embodiments of the shaft assembly, the first groove extends circumferentially along an inner wall surface of the shaft.

In one or more embodiments of the shaft assembly, the number of the second grooves is plural, and the plurality of the second grooves is uniformly distributed in the circumferential direction in the range of the bearing mounting region.

In one or more embodiments of the shaft assembly, the inner ring of the bearing is connected to the shaft in an interference fit, the inner ring of the bearing is pressed and stopped by a first lock nut on one side in the axial direction, and the inner ring of the bearing is stopped by a shaft shoulder of the shaft on the other side in the axial direction.

In one or more embodiments of the shaft assembly, the outer ring of the bearing is compression stopped on one side in the axial direction by a second lock nut, and the outer ring of the bearing is stopped on the other side in the axial direction by a stop shoulder of the bearing housing.

In one or more embodiments of the shaft assembly, the second lock nut has a third groove extending in an axial direction, the third groove disposed adjacent to an outer ring of the bearing; the bearing housing has a fourth groove extending in an axial direction, the fourth groove being disposed adjacent to the outer ring of the bearing and extending to an end of the bearing housing axially remote from the outer ring of the bearing.

In one or more embodiments of the shaft assembly, the inner ring of the bearing has a baffle disc between one side in the axial direction and the first lock nut, the baffle disc including a ring body portion and a disc body portion extending radially outwardly from the ring body portion, the ring body portion being connected radially to the outer wall surface of the shaft and being connected axially on both sides to the first lock nut and the inner ring of the bearing, respectively, the disc body portion extending radially at least to a radial position beyond the radially outer end of the first lock nut.

The shaft assembly described above, in addition to achieving the effect of preventing the bearing from being contaminated by metal shavings of the lubricating oil flowing from the inside of the shaft to the bearing in the secondary lubrication by the structure of the first groove, the second groove, and the through hole, allows the lubricating oil flowing from the outside of the shaft to the bearing to flow along the second lubricating oil path by the structure of the third groove and the fourth groove, and/or the baffle plate: the lubricating oil reaches the baffle disc, is blocked by the disc body part and is thrown outwards under the action of centrifugal force, the lubricating oil passes through the second lock nut and is provided with a third groove extending in the axial direction, the lubricating oil enters the inner wall surface of the bearing seat, and the lubricating oil passes through the fourth groove and is discharged outwards under the action of gravity, so that the bearing can be prevented from being polluted by metal scraps of the lubricating oil flowing from the outside of the shaft to the bearing in secondary lubrication, and the bearing is more comprehensively prevented from being polluted by the metal scraps of the lubricating oil in the secondary lubrication.

In one or more embodiments of the shaft assembly, the shaft assembly provides a lubrication flow path comprising: first lubricating oil flow path: lubricating oil flows from the inside of the shaft to the bearing, passes through a first groove on the inner wall surface of the shaft, is accumulated on the inner wall surface of the first groove under the action of centrifugal force, and after the lubricating oil fills the first groove, the lubricating oil flows through the first groove and enters the second groove on the inner wall surface of the shaft to the bearing through the through hole positioned in the second groove; and/or a second lubricating oil flow path: lubricating oil flows from the outside of axle to the bearing, and lubricating oil reaches and keeps off the fender dish, is blocked by disk body portion to outwards throw away under the effect of centrifugal force, lubricating oil passes through second lock nut has the third groove that extends in the axial, gets into the inner wall of bearing frame, through gravity effect the outside discharge of fourth groove.

A gearbox according to a second aspect of the utility model comprises a shaft assembly as described in the first aspect.

The gearbox described above has the advantage that the operation of the gearbox is more reliable due to the inclusion of the shaft assembly of the first aspect.

A gas turbine engine according to a third aspect of the utility model comprises a shaft assembly as in the first aspect.

The gas turbine engine described above has the advantage that the gas turbine engine is reliable and safe to operate due to the shaft assembly of the first aspect.

Drawings

The above and other features, properties and advantages of the present utility model will become more apparent from the following description in conjunction with the accompanying drawings and embodiments, in which:

FIG. 1 is a schematic structural view of a shaft assembly according to an embodiment.

FIG. 2 is a schematic structural view of a bearing of a shaft assembly according to an embodiment.

FIG. 3 is a schematic view of a baffle disc of an axle assembly according to an embodiment.

Fig. 4 is a schematic structural view of a first lock nut of a shaft assembly according to an embodiment.

Fig. 5 is a schematic structural view of a second lock nut of the shaft assembly according to an embodiment.

FIG. 6 is a schematic structural view of a bearing housing of a shaft assembly according to an embodiment.

Reference numerals:

a 100-axis assembly;

1-axis;

11-a first position;

12-a second position;

13-bearing mounting area;

14-inner wall surface of the shaft;

141-a first groove;

142-a second groove;

143-a through hole;

15-an outer wall surface of the shaft;

16-shaft shoulders;

2-bearing;

21-an inner ring;

22-an outer ring;

3-bearing seats;

31-a shoulder;

32-fourth groove;

41-a first lock nut;

42-a second lock nut;

421-third slot;

5-a baffle disc;

51-ring body portion;

52-disc body.

Detailed Description

The present utility model will be further described with reference to specific embodiments and drawings, in which more details are set forth in the following description in order to provide a thorough understanding of the present utility model, but it will be apparent that the present utility model can be embodied in many other forms than described herein, and that those skilled in the art may make similar generalizations and deductions depending on the actual application without departing from the spirit of the present utility model, and therefore should not be construed to limit the scope of the present utility model in terms of the content of this specific embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model; the terms "comprising" and "having" and any variations thereof in the description of the utility model and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the utility model. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present utility model, the orientation or positional relationship indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present utility model.

In the description of the embodiments of the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like should be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; but also mechanical connection, and the specific meaning of the above terms in the embodiments of the present utility model will be understood by those skilled in the art according to the specific circumstances.

The application scenario of the shaft assembly disclosed by the embodiment of the utility model is exemplified by a gas turbine engine and a gear box thereof. However, it is not limited to this, and it can be understood that the application scenario of the shaft assembly disclosed in the embodiment of the present utility model may be any scenario having secondary lubrication of the bearing, so as to achieve the effect of preventing the lubricant metal filings of the secondary lubrication from affecting the service life of the bearing.

Referring to fig. 1 and 2, in some embodiments, a shaft assembly 100 includes a shaft 1, a bearing 2, and a bearing housing 3.

Wherein a bearing mounting area 13 is defined between the first position 11 and the second position 12 in the length direction of the shaft 1; the bearing 2 is correspondingly mounted in the bearing mounting region 13, and comprises an inner ring 21 and an outer ring 22, the inner ring 21 being connected to the shaft 1, and the outer ring 22 being connected to the bearing housing 3. The shaft 1 is a hollow shaft, a first groove 141 and a second groove 142 are provided in the inner wall surface 14 of the shaft, the second groove 142 has a through hole 143 for communicating the inner wall surface 14 of the shaft with the outer wall surface 15 of the shaft, the through hole 143 is located within the bearing mounting region 13, and the first groove 141 is located on one side of the second groove 142 in the axial direction, for example, but not limited to this, for example, on the right side or both sides, and essentially, the first groove 141 is located on the upstream side of the second groove 142 in the flow path of the lubricating oil. When the lubricating oil flows into the bearing 2 in the shaft 1, it passes through the first groove 141 and then reaches the second groove 142.

The arrangement of the first groove 141, the second groove 142 and the through hole 143 has the beneficial effect that the lubricating oil flowing from the inside of the shaft 1 to the bearing 2 can flow along the first lubricating oil path: through the first groove 141 on the inner wall surface 14 of the shaft, the oil is deposited on the inner wall surface of the first groove 141 by centrifugal force, and when the oil fills the first groove 141, the oil passes through the first groove 141, enters the second groove 142 on the inner wall surface 14 of the shaft, and passes through the through hole 143 located in the second groove 142 to the bearing 2. Here, the first groove 141 serves as a space for accommodating the metal chips, and the second groove 142 and the through hole 143 serve as a space for accommodating the lubricant for secondary lubrication of the bearing and a transmission passage, i.e., the lubricant is deposited in the first groove 141 and then discharged to the bearing 2 through the second groove 142 and the through hole 143, so that the bearing 2 is prevented from being contaminated by the metal chips flowing from the inside of the shaft 1 to the bearing 2 during the secondary lubrication.

With continued reference to FIG. 1, in some embodiments, the first groove 141 may be specifically configured such that the first groove 141 extends circumferentially around the inner wall surface 14 of the shaft, such that lubrication oil at each circumferential location passes through the first groove 141 to substantially "intercept" the flow of lubrication oil from the interior of the shaft 1 toward the bearing 2 into the first groove 141 for the metal chip deposition process.

With continued reference to FIG. 1, in some embodiments, the number of second grooves 142 is a plurality, with the plurality of second grooves 142 being evenly distributed circumferentially across the bearing mounting region 13. This allows the lubricant to be formed in the second groove 142 to a certain thickness as soon as possible so as to be delivered to the bearing 2 through the through hole 143 for secondary lubrication.

With continued reference to fig. 1, 2 and 4, in some embodiments, the mounting and fixing structure of the bearing 2 may be that the inner ring 21 of the bearing is connected with the outer wall surface 15 of the shaft in an interference fit manner, and the inner ring 21 of the bearing is pressed and blocked by the first lock nut 41 on one side of the axial direction, and the inner ring 21 of the bearing is blocked by the shaft shoulder 16 of the shaft on the other side of the axial direction. The first lock nut 41 is similar to a usual lock nut in structure, and the inner ring 21 of the bearing is pressed against the shoulder 16 of the shaft on the other side by the pressing force of the nut, so that the bearing 2 is mounted and fixed more reliably.

As shown in fig. 1, 2, 5 and 6, in some embodiments, the mounting and fixing structure of the bearing 2 may also be that the outer ring 22 of the bearing is pressed and stopped by the second locking nut 42 at one axial side, and the outer ring 22 of the bearing is stopped by the stop shoulder 31 of the bearing seat 3 at the other axial side, so that the bearing 2 is mounted and fixed more reliably.

Preferably, in some embodiments, the structures of the second lock nut 42 and the bearing seat 3 may be respectively that the structure of the second lock nut 42 is different from that of the first lock nut 41, the second lock nut 42 has a third groove 421 extending in the axial direction, the third groove 421 is disposed adjacent to the outer ring 22 of the bearing, for example, as shown in fig. 5, the structure that the second lock nut 42 is connected to the outer ring 22 of the bearing is a rectangular tooth structure distributed in the circumferential direction, and the third groove 421 is formed between the circumferentially adjacent rectangular teeth. And the bearing housing 3 may be constructed with a fourth groove 32 extending in the axial direction, the fourth groove 32 being arranged adjacent to the outer ring 22 of the bearing and extending to the end of the bearing housing 3 axially remote from the outer ring 22 of the bearing. This allows the lubricant flowing from the outside of the shaft 1 to the bearing 2 to be discharged along the third groove 421 and the fourth groove 32 by centrifugal force, so as to prevent the bearing 2 from being contaminated by metal chips of the lubricant flowing from the outside of the shaft 1 to the bearing 2 in the secondary lubrication.

Preferably, referring to fig. 1, 2 and 3, in some embodiments, the shaft assembly 100 may further include a baffle disc 5 having a baffle disc 5 between one side of the baffle disc 5 bearing in the axial direction and the first lock nut 41, the baffle disc 5 including a ring body 51 and a disc body 52 extending radially outwardly from the ring body 51, the disc body 52 being boss-like as shown in fig. 3. The ring body 51 is connected to the shaft outer wall surface 15 in the radial direction, and is connected to the first lock nut 41 and the bearing inner ring 21 on both sides in the axial direction, and the disk 52 extends in the radial direction at least to a radial position beyond the radially outer end of the first lock nut 41. This can stop the lubricant flowing to the bearing 2 from the outside and throw out the lubricant falling on the disk portion 52 by centrifugal force.

As is clear from the above, by the structure of the third groove 421 and the fourth groove 32, and/or the baffle disc 5, the lubricating oil flowing from the outside of the shaft 1 to the bearing 2 can flow along the second lubricating oil path, and the lubricating oil reaches the baffle disc 5, is blocked by the disc body 52, and is thrown outward by centrifugal force, passes through the second lock nut 42, has the third groove 421 extending in the axial direction, enters the inner wall surface of the bearing housing 3, and is discharged outward by gravity through the fourth groove 32. This prevents the bearing from being contaminated by the metal chips of the lubricating oil flowing from the outside of the shaft to the bearing during the secondary lubrication, and the above-described structure in which the lubricating oil flowing from the inside of the shaft 1 to the bearing 2 can flow along the first lubricating oil path by combining the arrangement of the first groove 141, the second groove 142 and the through hole 143, thereby more comprehensively preventing the bearing 2 from being contaminated by the metal chips of the lubricating oil during the secondary lubrication.

As introduced above, in some embodiments, the lubrication path provided by the axle assembly 100 includes:

first lubricating oil flow path: the lubricating oil flows from the inside of the shaft 1 to the bearing 2, passes through the first groove 141 on the inner wall surface 14 of the shaft, is deposited on the inner wall surface of the first groove 141 by centrifugal force, and after the lubricating oil fills the first groove 141, the lubricating oil flows through the first groove 141 and enters the second groove 142 on the inner wall surface 14 of the shaft, and passes through the through hole 143 positioned in the second groove 142 to the bearing 2; and/or

Second lubricating oil flow path: the lubricating oil flows from the outside of the shaft 1 to the bearing 2, reaches the baffle disc 5, is blocked by the disc body 52, is thrown outwards by centrifugal force, passes through the second lock nut 42, has the third groove 421 extending in the axial direction, enters the inner wall surface of the bearing seat 3, and is discharged outwards by gravity through the fourth groove 32.

In summary, the advantages of the shaft assembly, gearbox, gas turbine engine described with the above embodiments include one or a combination of the following:

1. by the arrangement of the first groove, the second groove and the through hole, the lubricating oil flowing from the interior of the shaft to the bearing can flow along the first lubricating oil path, so that the bearing is prevented from being polluted by metal scraps of the lubricating oil flowing from the interior of the shaft to the bearing in secondary lubrication.

2. By the structure of the third groove and the fourth groove, and/or the baffle disc, the lubricating oil flowing from the outside of the shaft to the bearing can flow along the second lubricating oil path, so that the bearing is prevented from being polluted by metal scraps of the lubricating oil flowing from the outside of the shaft to the bearing in secondary lubrication.

3. The bearing life of the shaft assembly is long, so that the gearbox can reliably operate, and the gas turbine engine is good in safety.

While the utility model has been described in terms of preferred embodiments, it is not intended to be limiting, but rather to the utility model, as will occur to those skilled in the art, without departing from the spirit and scope of the utility model. Therefore, any modification, equivalent variation and modification of the above embodiments according to the technical substance of the present utility model fall within the protection scope defined by the claims of the present utility model.

Claims (10)

1. A shaft assembly (100), comprising:

a shaft (1) having a bearing mounting region (13) defined between a first position (11) and a second position (12) in the longitudinal direction of the shaft (1);

the bearing (2) is correspondingly arranged in the bearing installation area (13), the bearing comprises an inner ring (21) and an outer ring (22), the inner ring (21) is connected with the shaft (1), and the outer ring (22) is connected with the bearing seat (3);

the shaft (1) is a hollow shaft, a first groove (141) and a second groove (142) are formed in the inner wall surface (14) of the shaft, the second groove (142) is provided with a through hole (143) for communicating the inner wall surface (14) of the shaft with the outer wall surface (15) of the shaft, the through hole (143) is located in the range of the bearing installation area (13), and the first groove (141) is located on the upstream side of the second groove (142) in the axial direction.

2. The shaft assembly (100) of claim 1, wherein the first groove (141) extends circumferentially around the inner wall surface (14) of the shaft.

3. The shaft assembly (100) of claim 1, wherein the number of second grooves (142) is a plurality, the plurality of second grooves (142) being evenly distributed circumferentially within the bearing mounting region (13).

4. The shaft assembly (100) according to claim 1, characterized in that the inner ring (21) of the bearing is connected to the shaft (1) by an interference fit, the inner ring (21) of the bearing being blocked on one side in the axial direction by a first lock nut (41), the inner ring (21) of the bearing being blocked on the other side in the axial direction by a shoulder (16) of the shaft (1).

5. The shaft assembly (100) according to claim 4, characterized in that the outer ring (22) of the bearing is pressed shut on one side in the axial direction by a second lock nut (42), and that the outer ring (22) of the bearing is stopped on the other side in the axial direction by a stop shoulder (31) of the bearing housing (3).

6. The shaft assembly (100) of claim 5, wherein the second lock nut (42) has a third groove (421) extending in an axial direction, the third groove (421) being disposed adjacent to the outer ring (22) of the bearing; the bearing housing (3) has a fourth groove (32) extending in the axial direction, which fourth groove (32) is arranged adjacent to the outer ring (22) of the bearing and extends to an end of the bearing housing (3) axially remote from the outer ring (22) of the bearing.

7. The shaft assembly (100) according to claim 6, wherein the inner ring (21) of the bearing has a baffle disc (5) between one side in the axial direction and the first lock nut (41), the baffle disc (5) comprising a ring body portion (51) and a disc body portion (52) extending radially outwardly from the ring body portion (51), the ring body portion (51) being connected radially to the outer wall surface (15) of the shaft and being connected axially on both sides to the first lock nut (41), the inner ring (21) of the bearing, respectively, the disc body portion (52) extending radially at least to a radial position beyond the radially outer end of the first lock nut (41).

8. The shaft assembly (100) of claim 7, wherein the shaft assembly (100) provides a lubrication oil flow path comprising:

first lubricating oil flow path: lubricating oil flows from the inside of the shaft (1) to the bearing (2), passes through a first groove (141) on the inner wall surface (14) of the shaft, is accumulated on the inner wall surface of the first groove (141) under the action of centrifugal force, and after the lubricating oil fills the first groove (141), the lubricating oil flows through the first groove (141) and enters the second groove (142) on the inner wall surface (14) of the shaft, and passes through the through hole (143) positioned in the second groove (142) to the bearing (2); and/or

Second lubricating oil flow path: lubricating oil flows from the outside of the shaft (1) to the bearing (2), reaches the baffle disc (5), is blocked by the disc body (52) and is thrown outwards under the action of centrifugal force, passes through the second lock nut (42) and is provided with a third groove (421) extending in the axial direction, enters the inner wall surface of the bearing seat (3), and is discharged outwards through the fourth groove (32) under the action of gravity.

9. Gearbox, characterized in that it comprises a shaft assembly (100) according to any of claims 1-8.

10. A gas turbine engine, comprising a shaft assembly (100) according to any one of claims 1-8.