CN211901255U - Cantilevered gear assembly and engine - Google Patents

Abstract

The utility model provides a gear assembly and engine of cantilever type, the gear assembly of cantilever type includes: a gear; the rotating shaft is arranged on the gear, the inner wall surface of the gear and the outer wall surface of the rotating shaft are distributed at intervals, and at least one of the gear and the rotating shaft is provided with a limiting structure; the tapered roller bearing is arranged between the inner wall surface and the outer wall surface, wherein an outer ring of the tapered roller bearing is connected with the gear, an inner ring assembly of the tapered roller bearing is connected with the rotating shaft, and the limiting structure abuts against the tapered roller bearing so as to limit the tapered roller bearing to move along the axial direction. The conical roller bearing of this scheme can be better bear radial load and axial load, and the gear assembly has reliable and stable bears moment of flexure, shock load and transmission torque capacity, and helps the conical roller bearing collect together along the axial through limit structure restriction, reduces the conical roller bearing and collects together the situation of moving at the rotation in-process, promotes conical roller bearing's reliability, and then promotes the transmission reliability of gear.

Description

Cantilevered gear assembly and engine

Technical Field

The utility model relates to a gear field particularly, relates to a gear assembly and an engine of cantilever type.

Background

The gear transmission system is an important part of the engine, and the continuous operation stability of the gear transmission system is one of important indexes for evaluating the superior performance of the engine. Because the gear assembly is the core component of the connecting gear transmission system, it has direct influence on the stability and the service life of the gear transmission system. Particularly under the heavy load output working condition, the gear assembly must show the ability of stably and reliably bearing bending moment, anti-impact load and transmitting torque. Otherwise, the gear is easy to damage, so that the gear transmission system cannot work, and the performance of the engine and the whole machine is seriously influenced. At present, domestic engines mostly use a two-point support type transmission structure to output torque, so that the output torque can be stably transmitted, but the structure occupies more space.

SUMMERY OF THE UTILITY MODEL

In order to improve at least one of the above technical problems, an object of the present invention is to provide a gear assembly of a cantilever type.

Another object of the present invention is to provide an engine having the above-mentioned gear assembly.

To achieve the above object, an embodiment of the first aspect of the present invention provides a cantilever-type gear assembly, including: a gear; the rotating shaft is arranged on the gear, the inner wall surface of the gear and the outer wall surface of the rotating shaft are distributed at intervals, and at least one of the gear and the rotating shaft is provided with a limiting structure; the tapered roller bearing is arranged between the inner wall surface and the outer wall surface, wherein an outer ring of the tapered roller bearing is connected with the gear, an inner ring assembly of the tapered roller bearing is connected with the rotating shaft, and the limiting structure is abutted against the tapered roller bearing so as to limit the tapered roller bearing to move along the axial direction.

The cantilever type gear assembly provided by the above embodiment of the present invention is provided with a limiting structure on at least one of the gear and the rotating shaft, the limiting structure is abutted against the tapered roller bearing to limit the tapered roller bearing to be capable of supporting the radial load and the axial load along the axial direction, at first, the tapered roller bearing can better support the radial load and the axial load, the gear and the rotating shaft are connected through the tapered roller bearing, the gear assembly has stable and reliable bending moment, impact load and torque transmission capacity, which is beneficial to improving the use reliability of the product and extending the service life of the product, at second, the tapered roller bearing is limited to be capable of supporting the axial direction through the limiting structure, thereby reducing the shaking and sliding of the tapered roller bearing in the rotating process, improving the reliability of the tapered roller bearing, and further improving the transmission reliability of the gear, and at last, in the process of assembling the product, the limiting structure, adjustment is not needed, and the assembly precision of the product is improved.

In addition, the present invention provides a cantilever gear assembly in the above embodiments, which may further have the following additional technical features:

in the above-mentioned technical solution, the tapered roller bearing includes: a first bearing having a first inner race assembly and a first outer race; a second bearing having a second inner race assembly and a second outer race, the first and second bearings being oppositely and spaced apart; the limiting structure comprises a first limiting structure and a second limiting structure, wherein the gear is provided with the first limiting structure, the rotating shaft is provided with the second limiting structure, the first limiting structure is positioned between the first outer ring and the second outer ring and is abutted against the first outer ring and the second outer ring, and the second limiting structure is positioned on one side, away from the second bearing, of the first bearing, so that the second limiting structure and the second bearing clamp the first limiting structure and the first bearing.

In this scheme, set up the reverse and spaced setting of first bearing and second bearing, such a bearing bears radial load, will produce an axial component, bearing that can bear the opposite direction axial force through reverse another balances, thereby realize that tapered roller bearing can be better bears radial load and axial load, set up first limit structure and be located between first outer lane and the second outer lane and support and lean on first outer lane and second outer lane, realize spacing between first bearing and the second bearing through first limit structure like this, avoid first bearing and second bearing to collect together in the axial, promote tapered roller bearing's reliability, and then promote gear's transmission reliability, realize big torque transmission, the system operation is stable more reliable.

In any one of the above technical solutions, the first limiting structure is formed by protruding outward from a local area of the inner wall surface.

In this scheme, the setting is formed with first limit structure from the regional outside arch of internal face, and simple structure is favorable to reducing the processing degree of difficulty like this, and has saved the assembly step between gear and the first limit structure, shortens the equipment time, promotes the packaging efficiency.

In any one of the above technical solutions, the rotating shaft includes a rotating shaft body, the first inner ring assembly and the second inner ring assembly are respectively sleeved on the rotating shaft body, and the second limiting structure protrudes towards the periphery of the rotating shaft body relative to the outer surface of the rotating shaft body.

In this scheme, set up the protruding stretch of week of second limit structure towards the pivot body for the surface of pivot body, simple structure is favorable to reducing the processing degree of difficulty like this, and has saved the assembly step between pivot body and the second limit structure, shortens the equipment time.

In any one of the above technical solutions, a gap is formed between the first inner ring assembly and the second inner ring assembly, the rotating shaft is provided with an oil passage, and the oil passage is communicated with the gap.

In this scheme, set up oil channel and be linked together with the clearance, like this, lubricating oil flows into between first bearing and the second bearing from oil channel for lubricating oil can be more abundant adhere to between each spare part, reduces the mutual friction between the spare part through lubricating oil, reduces the wearing and tearing and the temperature of spare part, prolongs the life of spare part, improves the reliability of finished product.

In the above technical solution, the oil passage has a first passage and at least one second passage, one end of the second passage is communicated with the first passage, and the other end is communicated with the gap, wherein the first passage extends along the axial direction of the rotating shaft, and the extending direction of the second passage is inclined to the axial direction of the rotating shaft.

In this scheme, set up the axial extension of first passageway along the pivot, the extending direction slope of second passageway in the axial of pivot makes the lubricating oil can be more abundant attached to between each spare part, avoids the unable situation that gets into the dead angle position of lubricating oil, further reduces the mutual friction between the spare part, reduces the wearing and tearing and the temperature of spare part, prolongs the life of spare part, improves the reliability of product.

In the above technical solution, the tapered roller bearing has a cage ring, the cage ring has a first abutting surface and a second abutting surface which are opposite to each other, the first abutting surface abuts against the first inner ring assembly, the second abutting surface abuts against the second inner ring assembly, a groove is formed in a local recess of at least one of the first abutting surface and the second abutting surface, and the oil passage and the gap are communicated through the groove.

In this scheme, set up first support and support the face and the second supports and support the local sunken recess that is formed with of at least one of the two of the face, can adjust the play between first bearing and the second bearing through the spacer ring like this on the one hand, on the other hand, through the recess on the spacer ring realization switch on between oil passageway and the clearance, make the first bearing of inflow that lubricating oil can be smooth and easy, between second bearing and the gear, further reduce the mutual friction between the spare part, reduce the wearing and tearing and the temperature of spare part, the life of extension spare part, the reliability of the product is carried into, avoid the spacer ring to form the situation of hindrance to the flow of lubricating oil, promote the smooth and easy nature of flow of lubricating oil, realize that a thing is multi-purpose.

In any of the above technical solutions, the cantilevered gear assembly further includes: and the cover plate is abutted against the rotating shaft and the tapered roller bearing so as to press the tapered roller bearing on the limiting structure.

In this scheme, compress tightly tapered roller bearing in limit structure through the apron, further promote the compactedness of product structure like this, product space arranges compacter, avoids tapered roller bearing's axial to save together, and the lift system operation is reliable and stable.

In any of the above technical solutions, the gear includes a helical gear.

An embodiment of the second aspect of the present invention provides an engine, including: a cylinder body; according to the cantilever type gear assembly in any one of the technical schemes, the gear assembly is arranged on the cylinder body.

The utility model discloses the engine that above-mentioned embodiment provided is through being provided with among the above-mentioned arbitrary technical scheme the gear assembly of cantilever type to have above all beneficial effect, no longer give consideration to here.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic cross-sectional view of a gear assembly according to an embodiment of the present invention;

FIG. 2 is a partially enlarged schematic view of A shown in FIG. 1;

fig. 3 is a schematic front view of a tapered roller bearing according to an embodiment of the present invention;

fig. 4 is a schematic side view of a tapered roller bearing according to an embodiment of the present invention;

fig. 5 is a schematic front view of a space ring according to an embodiment of the present invention;

fig. 6 is a schematic cross-sectional view of a spacer according to an embodiment of the present invention;

fig. 7 is a front view of the gear according to an embodiment of the present invention;

FIG. 8 is a schematic cross-sectional view of B-B shown in FIG. 7;

fig. 9 is a schematic cross-sectional view of a rotating shaft according to an embodiment of the present invention;

fig. 10 is another schematic sectional view of the rotating shaft according to an embodiment of the present invention.

Wherein, the correspondence between the reference numbers and the component names in fig. 1 to 10 is:

the bearing comprises a gear assembly 1, gears 10, an inner wall surface 11, a first limiting structure 12, a rotating shaft 20, an outer wall surface 21, a second limiting structure 22, a rotating shaft body 23, an oil passing channel 24, a first channel 241, a second channel 242, a connecting hole 25, a tapered roller bearing 30, a first bearing 31, a first outer ring 311, a first inner ring assembly 312, a second bearing 32, a second outer ring 321, a second inner ring assembly 322, a spacer ring 33, a first abutting surface 331, a second abutting surface 332, a groove 333, a gap 34, a cover plate 40 and a fastener 50.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

A cantilevered gear assembly 1 according to some embodiments of the present invention will now be described with reference to fig. 1 to 10.

As shown in fig. 1 and 2, an embodiment of a first aspect of the present invention provides a cantilevered gear assembly 1, comprising: a gear 10; the rotating shaft 20 is arranged on the gear 10, the inner wall surface 11 of the gear 10 and the outer wall surface 21 of the rotating shaft 20 are distributed at intervals, and at least one of the gear 10 and the rotating shaft 20 is provided with a limiting structure; the tapered roller bearing 30 is arranged between the inner wall surface 11 and the outer wall surface 21 and is connected with the gear 10 and the rotating shaft 20, specifically, an outer ring of the tapered roller bearing 30 is connected with the gear, an inner ring assembly of the tapered roller bearing 30 is connected with the rotating shaft, and the limiting structure abuts against the tapered roller bearing 30 to limit the tapered roller bearing 30 to move along the axial direction.

The cantilever-type gear assembly 1 provided by the above-mentioned embodiment of the present invention is provided with a limiting structure on at least one of the gear 10 and the rotating shaft 20, the limiting structure is abutted against the tapered roller bearing 30 to limit the tapered roller bearing 30 to be able to withstand the radial load and the axial load better, at first, the tapered roller bearing 30 can withstand the radial load and the axial load, the gear 10 and the rotating shaft 20 are connected through the tapered roller bearing 30, the gear assembly 1 has stable and reliable capabilities of withstanding bending moment, resisting impact load and transmitting torque, and is favorable for improving the use reliability of the product and extending the service life of the product, secondly, the tapered roller bearing 30 is limited to be able to withstand the axial load through the limiting structure, thereby reducing the shaking and scraping situations of the tapered roller bearing 30 during the rotating process, improving the reliability of the tapered roller bearing 30, and further improving the transmission reliability of the gear 10, in the process of assembling the product, the limiting structure has the positioning function, adjustment is not needed, and the assembly precision of the product is improved.

In an embodiment of the present invention, as shown in fig. 1, 3 and 4, the tapered roller bearing 30 includes: a first bearing 31 having a first inner race assembly 312 and a first outer race 311; a second bearing 32 having a second inner race assembly 322 and a second outer race 321, the first bearing 31 and the second bearing 32 being oppositely and spaced apart; the limiting structure comprises a first limiting structure 12 and a second limiting structure 22, wherein the gear 10 has the first limiting structure 12, the rotating shaft 20 has the second limiting structure 22, the first limiting structure 12 is located between the first outer ring 311 and the second outer ring 321 and abuts against the first outer ring 311 and the second outer ring 321, and the second limiting structure 22 is located on one side, away from the second bearing 32, of the first bearing 31, so that the second limiting structure 22 and the second bearing 32 clamp the first limiting structure 12 and the first bearing 31. Spacing between first bearing 31 and the second bearing 32 is realized through first limit structure 12 like this, avoids first bearing 31 and second bearing 32 to set up in the axial, promotes tapered roller bearing 30's reliability, and then promotes gear 10's transmission reliability, realizes big moment of torsion transmission, and the system operation is stable more reliable.

In an embodiment of the present invention, as shown in fig. 7 and 8, a first limiting structure 12 is formed to protrude outward from a local area of the inner wall surface 11. Therefore, the structure is simple, the processing difficulty is reduced, the assembling step between the gear 10 and the first limiting structure 12 is omitted, the assembling time is shortened, and the assembling efficiency is improved.

For example, the first limit structure 12 is annular.

In other embodiments, the gear 10 and the first limiting structure 12 may be designed as a separate component, so that the gear 10 may not be affected by the first limiting structure 12, and thus, the gear 10 may be applied to other transmission systems to increase the application range of the gear 10.

In an embodiment of the utility model, as shown in fig. 1 and fig. 10, the pivot 20 includes the pivot body 23, and first inner circle subassembly 312 and second inner circle subassembly 322 are respectively suit on the pivot body 23, and the second limit structure 22 is protruding to stretch towards the week side of pivot body 23 for the surface of pivot body 23, and simple structure is favorable to reducing the processing degree of difficulty like this, and has saved the assembly step between pivot body 23 and the second limit structure 22, shortens the equipment time.

In some embodiments, the rotating shaft body 23 has two opposite ends, wherein one end is formed with the second limiting structure 22, in the assembling process, the first bearing 31 and the second bearing 32 are respectively sleeved on the rotating shaft body 23 from the other end, and the first bearing 31 abuts against the second limiting structure 22, so that the first bearing 31 is positioned in the assembling process through the second limiting structure 22, which is beneficial to improving the assembling precision of products, further improving the matching precision between each part and the product, and improving the transmission reliability of the products.

In an embodiment of the present invention, as shown in fig. 1, 4 and 9, a gap 34 is formed between the first inner ring assembly 312 and the second inner ring assembly 322, the rotating shaft 20 is provided with the oil passage 24, and the oil passage 24 is communicated with the gap 34. Thus, the lubricating oil flows into the space between the first bearing 31 and the second bearing 32 from the oil passing channel 24, so that the lubricating oil can be attached between the parts more fully, the mutual friction between the parts is reduced through the lubricating oil, the abrasion and the temperature of the parts are reduced, the service life of the parts is prolonged, and the reliability of the product is improved.

Further, as shown in fig. 9 and 10, the oil passing passage 24 has a first passage 241 and at least one second passage 242, and one end of the second passage 242 communicates with the first passage 241 and the other end communicates with the gap 34, wherein the first passage 241 extends in the axial direction of the rotating shaft 20, and the extending direction of the second passage 242 is inclined to the axial direction of the rotating shaft 20. The lubricating oil can be more fully attached between each part, the situation that the lubricating oil cannot enter dead angle positions is avoided, mutual friction between the parts is further reduced, abrasion and temperature of the parts are reduced, the service life of the parts is prolonged, and reliability of products is improved.

In certain embodiments, as shown in fig. 4, 5 and 6, the tapered roller bearing 30 has a cage 33, the cage 33 has a first abutting face 331 and a second abutting face 332 which are opposite, the first abutting face 331 abuts against the first inner ring assembly 312, and the second abutting face 332 abuts against the second inner ring assembly 322, wherein a groove 333 is formed in a partial recess of at least one of the first abutting face 331 and the second abutting face 332, and the oil passage 24 and the gap 34 communicate with each other through the groove 333. Therefore, on one hand, the clearance between the first bearing 31 and the second bearing 32 can be adjusted through the spacer 33, on the other hand, the groove 333 in the spacer 33 is used for realizing the conduction between the oil passage 24 and the gap 34, so that the lubricating oil can smoothly flow into the first bearing 31, the second bearing 32 and the gear 10, the mutual friction among parts is further reduced, the abrasion and the temperature of the parts are reduced, the service life of the parts is prolonged, the reliability of the product is improved, the situation that the spacer 33 blocks the flowing of the lubricating oil is avoided, the flowing smoothness of the lubricating oil is improved, and the multifunctional purpose of one object is realized.

In an embodiment of the present invention, as shown in fig. 1, the gear assembly 1, which is cantilevered, further includes: and the cover plate 40 abuts against the rotating shaft 20 and the tapered roller bearing 30, so that the tapered roller bearing 30 is pressed to the limiting structure. Therefore, the compactness of the product structure is further improved, the product space arrangement is more compact, the axial sliding of the tapered roller bearing 30 is avoided, and the operation of the lifting system is stable and reliable.

For example, the rotating shaft 20 is provided with a connecting hole 25, the cover plate 40 is provided with a through hole adapted to the connecting hole 25, the cover plate 40 abuts against the rotating shaft 20 and the tapered roller bearing 30, and a fastener 50 (e.g., a bolt) penetrates through the through hole and the connecting hole 25 to lock the tapered roller bearing 30 and the rotating shaft 20.

In some embodiments, the gear 10 comprises a helical gear 10.

An embodiment of the second aspect of the present invention provides an engine, including: a cylinder body; according to the cantilever type gear assembly 1 in any technical scheme, the gear assembly 1 is arranged on the cylinder body.

The utility model discloses the engine that above-mentioned embodiment provided is through the gear assembly 1 that is provided with the cantilever type among the above-mentioned arbitrary technical scheme to have above all beneficial effects, no longer describe herein.

In one particular embodiment, as shown in fig. 1 to 10, the cantilevered gear assembly 1 comprises: a rotating shaft 20, a tapered roller bearing 30, a gear 10 and a cover plate 40.

The tapered roller bearing 30 includes a first bearing 31, a second bearing 32 and a spacer ring 33 disposed between the first bearing 31 and the second bearing 32, specifically, the first bearing 31 includes a first outer ring 311 and a first inner ring assembly 312, the second bearing 32 includes a second outer ring 321 and a second inner ring assembly 322, wherein the first outer ring 311 and the second outer ring 321 are respectively disposed on the inner wall surface 11 of the gear 10, and the first outer ring 311 and the second outer ring 321 are located on two sides of the first limiting structure 12 and respectively abut against the first limiting structure 12. The first inner ring assembly 312, the second inner ring assembly 322 and the spacer 33 are respectively sleeved on the rotating shaft 20, and the first inner ring assembly 312 abuts against the second limiting structure 22 on the rotating shaft 20. The cover plate 40 abuts against the rotating shaft 20 and the tapered roller bearing 30 to press the tapered roller bearing 30 against the stopper structure.

The specific assembly steps are as follows:

firstly, respectively penetrating a first outer ring 311 and a second outer ring 321 through the gear 10, so that the first outer ring 311 and the second outer ring 321 are integrated with the gear 10; then, the first inner ring assembly 312 is sleeved on the rotating shaft 20, the first inner ring assembly 312 abuts against the second limiting structure 22 on the rotating shaft 20, the spacer ring 33 is sleeved on the rotating shaft 20, and the spacer ring 33 abuts against the first inner ring assembly 312, so that the first inner ring assembly 312, the spacer ring 33 and the rotating shaft 20 are integrated into a whole, in some embodiments, the groove 333 on the spacer ring 33 is designed to face a side away from the first inner ring assembly 312;

then the rotating shaft 20 provided with the first inner ring assembly 312 and the spacer ring 33 is arranged on the gear 10 provided with the first outer ring 311 and the second outer ring 321 in a penetrating manner, finally the second inner ring assembly 322 is sleeved on the rotating shaft 20, meanwhile, the cover plate 40 abuts against the rotating shaft 20 and the tapered roller bearing 30, and the cover plate 40 and the rotating shaft 20 are locked through the fastener 50, so that the tapered roller bearing 30 is pressed on the limiting structure. In some embodiments, the fastener 50 locks the gear assembly 1 to the block of the engine.

After the installation, the lubricating oil a flows from the direction shown in the figure, passes through the shaft of the gear 10 and the space ring 33, then enters the bearing and the gear 10 for lubrication, and finally takes away heat from the other side of the bearing.

The utility model provides a cantilever type gear assembly 1, through mated tapered roller bearing 30, make gear assembly 1 can be applied to the heavy load transmission output torque condition, the big moment of torsion stability problem of gear assembly 1 transmission has greatly been improved, solve the high temperature problem in the gear assembly 1 simultaneously, thereby improve the reliability of gear 10 transmission system work, greatly prolong the life of equipment, promote the practicality and the reliability of product, first limit structure 12 and second limit structure 22 realize location and spacing between each spare part, need not the adjustment, spatial arrangement is compact, it is lubricated good, realize big moment of torsion transmission, the system operation is reliable and stable.

In the present invention, the terms "mounting", "connecting", "fixing" and the like are used in a broad sense, for example, "connecting" may be a fixed connection, a detachable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description of the present invention, it should be understood that the terms "inside" and "outside" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or unit indicated must have a specific orientation, be constructed and operated in a specific orientation, and therefore, should not be construed as limiting the present invention.

In the description of the present specification, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to 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 (10)

1. A cantilevered gear assembly, comprising:

a gear;

the rotating shaft is arranged on the gear, the inner wall surface of the gear and the outer wall surface of the rotating shaft are distributed at intervals, and at least one of the gear and the rotating shaft is provided with a limiting structure;

the tapered roller bearing is arranged between the inner wall surface and the outer wall surface, wherein an outer ring of the tapered roller bearing is connected with the gear, an inner ring assembly of the tapered roller bearing is connected with the rotating shaft, and the limiting structure is abutted against the tapered roller bearing so as to limit the tapered roller bearing to move along the axial direction.

2. The cantilevered gear assembly of claim 1 wherein the tapered roller bearing comprises:

a first bearing having a first inner race assembly and a first outer race;

a second bearing having a second inner race assembly and a second outer race, the first and second bearings being oppositely and spaced apart;

the limiting structure comprises a first limiting structure and a second limiting structure, wherein the gear is provided with the first limiting structure, the rotating shaft is provided with the second limiting structure, the first limiting structure is located between the first outer ring and the second outer ring and is abutted against the first outer ring and the second outer ring, and the second limiting structure is located on one side, away from the second bearing, of the first bearing, so that the second limiting structure and the second bearing clamp the first limiting structure and the first bearing.

3. The cantilevered gear assembly according to claim 2,

the first limiting structure is formed by protruding outwards from a local area of the inner wall surface.

4. The cantilevered gear assembly according to claim 2 or 3,

the rotating shaft comprises a rotating shaft body, the first inner ring assembly and the second inner ring assembly are sleeved on the rotating shaft body respectively, and the second limiting structure protrudes towards the periphery of the rotating shaft body relative to the outer surface of the rotating shaft body.

5. The cantilevered gear assembly according to claim 2 or 3,

a gap is formed between the first inner ring assembly and the second inner ring assembly, an oil passing channel is arranged on the rotating shaft, and the oil passing channel is communicated with the gap.

6. The cantilevered gear assembly of claim 5,

the oil passing channel is provided with a first channel and at least one second channel, one end of the second channel is communicated with the first channel, the other end of the second channel is communicated with the gap, the first channel extends along the axial direction of the rotating shaft, and the extending direction of the second channel is inclined to the axial direction of the rotating shaft.

7. The cantilevered gear assembly of claim 5,

the tapered roller bearing is provided with a spacer ring, the spacer ring is provided with a first abutting surface and a second abutting surface which are opposite, the first abutting surface abuts against the first inner ring assembly, the second abutting surface abuts against the second inner ring assembly, a groove is formed in a local recess of at least one of the first abutting surface and the second abutting surface, and the oil passing channel and the gap are communicated through the groove.

8. A cantilevered gear assembly according to any one of claims 1 to 3,

the cantilevered gear assembly further comprises: and the cover plate is abutted against the rotating shaft and the tapered roller bearing so as to press the tapered roller bearing on the limiting structure.

9. A cantilevered gear assembly according to any one of claims 1 to 3,

the gear comprises a helical gear.

10. An engine, comprising:

a cylinder body;

the cantilevered gear assembly of any one of claims 1 to 9, provided on the cylinder.

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