CN216111042U - Engine assembly - Google Patents

Abstract

The utility model discloses an engine assembly, comprising: the timing oil seal is arranged on the timing cover and is in sealing fit with the hole wall of the mounting hole and the crankshaft respectively, the oil blocking piece is arranged on the crankshaft and rotates along with the crankshaft, and the oil blocking piece is located between the crankcase and the oil seal. According to the engine assembly provided by the embodiment of the utility model, the oil blocking piece rotating along with the crankshaft is arranged, the rotating oil blocking piece can block part of oil in the crankcase, and the phenomenon that part of oil in the crankcase is sprayed towards the oil seal is avoided, so that a large amount of oil is prevented from contacting the oil seal, and the sealing performance of the oil seal is improved.

Description

Engine assembly

Technical Field

The utility model relates to the technical field of engines, in particular to an engine assembly.

Background

In the related art, a crankshaft oil seal is generally disposed between a housing of an engine and a crankshaft, and the crankshaft oil seal can prevent oil inside the engine from leaking to the outside and prevent foreign matters such as external dust, sand and dirt from entering the inside of the engine, so as to isolate an oil chamber from the outside.

However, the oil blanket on the existing market is mostly the rubber frame oil blanket, the oil blanket seals principle is simple and the method is single, lead to a large amount of fluid can splash to the oil blanket lip, because of containing impurity in the fluid, like this along with the increase of engine mileage, impurity in the fluid can lead to the fact wearing and tearing to the oil blanket lip, lead to the fact destruction to the oil blanket lip sealing strip unavoidably, and then lead to the sealing performance of oil blanket to descend, and when engine operating temperature is unusual, also can accelerate ageing and wearing and tearing of oil blanket, further reduce the sealing performance of oil blanket.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention is directed to an engine assembly, which can prevent a large amount of oil from splashing to an oil seal, so as to improve the sealing performance of the oil seal.

In order to achieve the purpose, the technical scheme of the utility model is realized as follows:

an engine assembly, comprising: a crankcase provided with a crankshaft; the timing cover is arranged on one side of the crankcase and is provided with a mounting hole; the oil seal is arranged on the timing cover and is respectively in sealing fit with the hole wall of the mounting hole and the crankshaft; the oil blocking piece is installed on the crankshaft and rotates along with the crankshaft, and the oil blocking piece is located between the crankcase and the oil seal.

According to the engine assembly provided by the embodiment of the utility model, the oil blocking piece rotating along with the crankshaft is arranged, and the oil blocking piece is positioned between the crankcase and the oil seal, so that when the oil blocking piece rotates, part of oil in the crankcase can be blocked from splashing towards the oil seal, and part of oil is blocked in the crankcase, so that a large amount of oil is prevented from contacting the oil seal, the oil seal is prevented from being abraded by impurities contained in the oil, the service life of the oil seal is prolonged, and the sealing performance of the oil seal is improved.

In addition, the engine assembly according to the above embodiment of the present invention may further have the following additional technical features:

in some examples, a flow guide gap is formed between the wall of the mounting hole and the oil blocking member, and a space between the oil blocking member and the oil seal is communicated with the flow guide gap.

In some examples, a hole wall of the mounting hole has a flow guide protrusion extending in a direction close to the crankshaft, the flow guide protrusion being located between the oil retainer and the oil seal.

In some examples, in a plane perpendicular to a center line of the mounting hole, a projection of the flow guide protrusion on the plane and a projection of the oil retainer on the plane are coincident.

In some examples, a side of the oil retainer facing away from the oil seal has an oil retaining surface that gradually approaches the oil seal in a direction away from the crankshaft.

In some examples, the oil retainer is a fan, and blades of the fan are gradually close to the oil seal from a blade root to a blade tip.

In some examples, the blade root of the blade is located outside the mounting hole and the blade tip of the blade is located within the mounting hole.

In some examples, a side of the oil seal facing the oil retainer has a cavity opening to the oil retainer, the cavity being adapted to form a negative pressure chamber when the fan rotates.

In some examples, a timing chain wheel is installed between the crankshaft and the oil blocking member, a hub of a damping pulley is installed between the crankshaft and the oil seal, the oil blocking member is installed on the crankshaft through the timing chain wheel, the oil seal can rotate relative to the hub of the damping pulley, and the crankshaft is in sealing fit with the oil seal through the hub.

In some examples, a side of the oil seal facing the hub is provided with a sealing lip and a dust lip, and the sealing lip abuts against the hub.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:

FIG. 1 is a schematic illustration of an engine assembly according to some embodiments of the present disclosure.

Fig. 2 is a cross-sectional view taken along line a-a of fig. 1.

Fig. 3 is a partial enlarged view of the region i in fig. 2.

Fig. 4 is a partial enlarged view of the area ii in fig. 3.

Reference numerals:

1000. an engine assembly;

100. a crankcase; 110. a crankshaft;

200. a timing cover; 210. mounting holes; 211. a flow guide convex part;

300. oil sealing; 310. a cavity; 320. a sealing lip; 330. a dust lip;

400. an oil blocking member;

410. oil blocking surface;

420. a blade; 4201. a blade root; 4202. leaf tops;

500. a flow guiding gap;

600. a shock absorbing pulley; 610. a hub;

700. a timing sprocket;

800. a fastener.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

The present invention will be described in detail with reference to fig. 1 to 4 in conjunction with examples.

As shown in fig. 2 and 3, an engine assembly 1000 according to an embodiment of the present invention includes: a crankcase 100, a timing cover 200, an oil seal 300, and an oil baffle 400.

As shown in fig. 2, a crankshaft 110 is provided in the crankcase 100, and a timing cover 200 is provided on one side of the crankcase 100.

As shown in fig. 3, the timing cover 200 has a mounting hole 210.

As shown in fig. 3, the oil seal 300 is mounted to the timing cover 200, and the oil seal 300 is sealingly engaged with the hole wall of the mounting hole 210 and the crankshaft 110, respectively. In some examples, the oil seal 300 may be directly connected to the wall of the mounting hole 210 to achieve a sealing fit between one end of the oil seal 300 and the wall of the mounting hole 210, and the other end of the oil seal 300 and the crankshaft 110, so as to achieve the purpose of isolating the oil chamber from the outside through the oil seal 300.

As shown in fig. 3, the oil blocking member 400 is mounted on the crankshaft 110, the oil blocking member 400 rotates together with the crankshaft 110, and the oil blocking member 400 is located between the crankcase 100 and the oil seal 300.

As can be seen from the above structure, the engine assembly 1000 according to the embodiment of the utility model, by providing the mounting hole 210 on the timing cover 200, the mounting hole 210 is used for avoiding the crankshaft 110, so as to ensure that the crankshaft 110 can extend out of the crankcase 100, and the mounting hole 210 also provides an avoiding space for the arrangement of the oil seal 300 and the oil baffle 400, so as to facilitate the installation of the oil seal 300 and the oil baffle 400. The crankshaft 110 and the crankcase 100 are well known in the art, and will not be described herein.

By arranging the oil seal 300, and the oil seal 300 is in sealing fit with the hole wall of the mounting hole 210, on one hand, the oil seal 300 can prevent oil in the crankcase 100 from leaking to the outside, and the oil leakage risk is reduced; on the other hand, the oil can be prevented from being polluted by foreign matters such as external dust, sand and dust in the crankcase 100.

Through setting up oil blocking member 400, and oil blocking member 400 installs on bent axle 110, can drive oil blocking member 400 synchronous rotation at the pivoted in-process as bent axle 110 like this, because of oil blocking member 400 is located between crankcase 100 and oil blanket 300, can form a separation piece between crankcase 100 and oil blanket 300 at the pivoted in-process when oil blocking member 400, this separation piece is used for separation fluid to flow towards oil blanket 300, thereby avoid the partial fluid in crankcase 100 to flow or splash to oil blanket 300, just so can avoid impurity contact oil blanket 300 of adulteration in the fluid and cause wearing and tearing to oil blanket 300, still promoted oil blanket 300's sealing performance when extension oil blanket 300 life.

It should be noted that, the oil blocking member 400 is installed on the crankshaft 110, in some examples, the oil blocking member 400 is sleeved on the crankshaft 110 and is in interference fit with the crankshaft 110, so that the oil blocking member 400 can be driven to rotate synchronously in the rotation process of the crankshaft 110, and the purpose that the oil blocking member 400 rotates along with the crankshaft 110 is achieved, so that the oil blocking member 400 can effectively block oil.

Therefore, when the oil blocking piece 400 is arranged to block oil from splashing onto the oil seal 300, on one hand, abrasion of impurities on the oil seal 300 can be avoided, the service life of the oil seal 300 is prolonged, and a user is prevented from replacing the oil seal 300 for multiple times in a short time, so that after-sale maintenance cost is reduced, and user experience is improved; on the other hand, the amount of the oil splashed onto the oil seal 300 becomes small, and accordingly the sealing performance of the oil seal 300 is improved, so that the environment is prevented from being polluted by the leaked oil.

It is worth noting that, because of setting up oil blocking piece 400, some fluid in the crankcase 100 can not flow on the oil blanket 300, that is to say, oil blocking piece 400 has also played the effect of avoiding the inside fluid of crankcase 100 to leak outside to the realization realizes double sealing to the inside fluid of crankcase 100, further improves sealing performance, and for only adopting oil blanket 300 to seal among the prior art, this application has reduced the sealed degree of difficulty of oil blanket 300.

It can be understood that, compared with the prior art, the oil blocking member 400 is arranged, so that the oil blocking member 400 can prevent the oil in the crankcase 100 from splashing towards the oil seal 300 in the process of rotating along with the crankshaft 110, thereby preventing the oil seal 300 from being abraded by the impurity doped with the oil, prolonging the service life of the oil seal 300 and improving the sealing performance of the oil seal 300.

In some embodiments of the present invention, as shown in fig. 4, a flow guide gap 500 is formed between the wall of the mounting hole 210 and the oil deflector 400, and a space between the oil deflector 400 and the oil seal 300 communicates with the flow guide gap 500. The guide gap 500 is used for avoiding part of oil, so that part of oil in the crankcase 100 can flow into a space between the oil blocking member 400 and the oil seal 300 through the guide gap 500, and the subsequent lubrication of part of structures of the oil seal 300 by part of oil is facilitated.

Therefore, the oil blocking piece 400 is arranged, and compared with the situation that no oil blocking structure is arranged in the prior art, the oil blocking piece 400 can block most oil in the crankcase 100, wherein a small part of oil is not blocked by the oil blocking piece 400 (the small part of oil flows into the space between the oil blocking piece 400 and the oil seal 300 through the flow guide gap 500), so that the small part of oil can be sprayed onto the oil seal 300 to lubricate the oil seal 300.

For among the prior art a large amount of fluid splash to oil blanket 300, the impurity that contains in the corresponding fluid of the some fluid in this application also can reduce, like this the wearing and tearing that impurity caused oil blanket 300 can greatly reduced, thereby reach and utilize this some fluid to carry out lubricated purpose to oil blanket 300, with the sealing reliability who promotes oil blanket 300, and avoid oil blanket 300 to appear long mileage ageing, the poor scheduling problem of reliability after wearing and tearing, thereby make oil blanket 300's sealed effect outstanding more.

It should be noted that the flow guiding gap 500 may be specifically formed by arranging the oil blocking member 400 at an interval between one side of the oil blocking member 400 close to the hole wall of the mounting hole 210 and the hole wall of the mounting hole 210, so that the flow guiding gap 500 may be formed after the oil blocking member 400 is installed in relation to the mounting hole 210, and a flow guiding structure does not need to be separately arranged on the timing cover 200, thereby reducing the manufacturing difficulty.

Alternatively, as shown in fig. 4, the hole wall of the mounting hole 210 has a flow guide protrusion 211 extending toward the direction close to the crankshaft 110, the flow guide protrusion 211 being located between the oil deflector 400 and the oil seal 300. On one hand, the flow guide convex part 211 can guide the oil entering from the flow guide gap 500, so that the oil entering from the flow guide gap 500 can be ensured to be sprayed towards the axis direction of the crankshaft 110, and the contact part of the oil seal 300 and the crankshaft 110 can be lubricated conveniently; on the other hand, the flow guiding protrusion 211 can also buffer the oil entering between the oil blocking member 400 and the oil seal 300 from the flow guiding gap 500, so as to slow down the flowing speed of the oil, prevent the oil from directly impacting the oil seal 300 to damage the oil seal 300, and prolong the service life of the oil seal 300.

Alternatively, in a plane perpendicular to the center line of the mounting hole 210, a projection of the guide protrusion 211 on the plane and a projection of the oil deflector 400 on the plane may coincide. The oil flowing in from the guide gap 500 can be smoothly sprayed on the guide convex part 211, so that the guide convex part 211 can guide and buffer the entering oil.

It should be noted that a plane perpendicular to the center line of the mounting hole 210 as used herein may be understood as a plane perpendicular to the axis of the crankshaft 110, and in a specific example, may be a plane extending in the vertical direction in fig. 3. If the projection of the flow guide protrusion 211 on the plane is not coincident with the projection of the oil blocking member 400 on the plane in the plane perpendicular to the center line of the mounting hole 210, the oil seal 300 is impacted between the oil flowing from the flow guide gap 500, and the flow guide protrusion 211 cannot play its own role, so that the projection of the flow guide protrusion 211 on the plane is coincident with the projection of the oil blocking member 400 on the plane, and the flow guide protrusion 211 can fully play its own role.

In a specific example, on the premise that the size of the gap of the flow guide gap 500 is fixed, the projection of the flow guide protrusion 211 on the plane is partially overlapped with the projection of the oil blocking member 400 on the plane by adjusting the extending distance of the flow guide protrusion 211, so that the flow guide protrusion 211 can guide and buffer oil.

In some embodiments of the present invention, as shown in fig. 3, the side of the oil blocking member 400 facing away from the oil seal 300 has an oil blocking surface 410. That is, the oil blocking surface 410 is disposed toward the crankcase 100, so that oil in the crankcase 100 is blocked by the oil blocking surface 410.

Alternatively, as shown in fig. 3, the oil blocking surface 410 gradually approaches the oil seal 300 in a direction away from the crankshaft 110. That is to say, keep off oil level 410 when extending along the direction that deviates from bent axle 110, extend towards the direction that is close to oil blanket 300 gradually to the oil level 410 that keeps off that forms the slope and set up, at the pivoted in-process of keeping off oil piece 400 like this, keep off oil level 410 and can throw away into crankcase 100 with the fluid that splashes on keeping off oil piece 400, avoid fluid to be detained on keeping off oil level 410, thereby increase the oil blocking effect that keeps off oil piece 400.

In some examples, the oil dam surface 410 extends in a direction toward the oil seal 300 from inside to outside in the radial direction of the mounting hole 210. So that the oil blocking surface 410 extends in a direction away from the crankshaft 110 and gradually approaches the oil seal 300, wherein the term "from inside to outside" as used herein is understood to extend from a position near the center line of the mounting hole 210 toward the wall of the mounting hole 210. Compared with the oil blocking surface 410 arranged perpendicular to the axial direction of the crankshaft 110, the inclined oil blocking surface 410 can increase the area of the oil blocking surface 410, so that the oil blocking surface 410 can block more oil; on the other hand, in the pivoted in-process of keeping off oil spare 400, the oil level 410 that keeps off that the slope set up can also be with splashing the fluid that keeps off on oil level 410 get rid of the crankcase 100 in, avoid fluid to be detained on keeping off oil level 410, because of if fluid is detained on keeping off oil level 410, along with the increase of mileage, the phenomenon in the fluid overflow to the space between oil level 400 and the oil blanket 300 of keeping off of oil level 410 probably appears, consequently, the oil level 410 that keeps off that the slope set up can further increase the oil blocking effect of keeping off oil spare 400.

In some embodiments of the present invention, the oil deflector 400 is a fan. By applying the fan principle, in the process that the crankshaft 110 drives the fan to rotate, the gas thrust generated by the rotation of the fan stops the splashing of partial oil on the oil seal 300 in the crankcase 100, so that the aim of stopping the splashing of the oil towards the oil seal 300 is achieved, and the centrifugal force generated by the rotation of the fan can be utilized to throw the oil remained on the fan into the crankcase 100, thereby further avoiding the splashing of the partial oil on the oil seal 300. Therefore, this application sets the fan to through keeping off oil spare 400, and usable fan blocks on the one hand that fluid directly splashes to oil blanket 300, and on the other hand still can utilize the fan to throw into crankcase 100 with the fluid that splashes on the fan to guarantee from many aspects that the part fluid that splashes in crankcase 100 can not splash to oil blanket 300 on, promote the oily effect of keeping off oil spare 400.

Optionally, the rotational speed of the fan is greater than the speed at which oil splashes within the crankcase 100. Ensure that the pivoted fan can effectively withstand the fluid that splashes to further promote the oil blocking effect of oil blocking piece 400.

In some examples, the fan may be rotated at 1500-3000 rpm to effectively withstand oil splashed within the crankcase 100 when the engine assembly 1000 is in a normal operating condition.

Alternatively, as shown in fig. 4, the blades 420 of the fan come closer to the oil seal 300 from the blade root 4201 to the blade tip 4202. That is, compared with the blade root 4201, the blade tip 4202 is disposed close to the oil seal 300 to form the blade 420 disposed obliquely, so as to increase the oil blocking area of the blade 420 and ensure that the blade 420 can block more oil; on the other hand, the fan is ensured to throw the oil splashed on the blades 420 into the crankcase 100.

Alternatively, as shown in FIG. 4, the blade root 4201 of the blade 420 is positioned outside the mounting hole 210 and the tip 4202 of the blade 420 is positioned inside the mounting hole 210. If the blade root 4201 and the blade tip 4202 are both disposed in the mounting hole 210, when oil splashed on the blade 420 is thrown into the crankcase 100 by the fan, a part of the oil may be thrown onto the wall of the mounting hole 210, and a part of the oil thrown onto the wall of the mounting hole 210 flows along the wall and flows into the space between the oil blocking member 400 and the oil seal 300, thereby reducing the oil blocking effect of the oil blocking member 400; if the blade root 4201 and the blade tip 4202 are both disposed outside the mounting hole 210, the flow guiding gap 500 cannot be formed, and even if some oil enters the space between the oil blocking piece 400 and the oil seal 300, it cannot be ensured that the entered oil can be guided by the flow guiding protrusion 211, therefore, by disposing the blade root 4201 outside the mounting hole 210 and disposing the blade tip 4202 inside the mounting hole 210, it is ensured that the oil on the blade 420 can be smoothly guided into the crankcase 100, the oil blocking effect of the oil blocking piece 400 is improved, and the flow guiding gap 500 can be conveniently formed, so as to lubricate the oil seal 300, and prolong the service life of the oil seal 300.

Alternatively, as shown in fig. 4, the side of the oil seal 300 facing the oil deflector 400 has a cavity 310, the cavity 310 being open to the oil deflector 400, the cavity 310 being adapted to form a negative pressure chamber when the fan is rotated. The negative pressure chamber ensures that the oil introduced between the oil deflector 400 and the oil seal 300 flows toward the oil seal 300 and suppresses the outflow of the oil, thereby facilitating the lubrication of the oil seal 300.

In a specific example, air between the oil blocking member 400 and the oil seal 300 is evacuated mainly by rotation of the fan to generate a negative pressure, so that the cavity 310 forms a negative pressure chamber, and outflow of oil between the oil blocking member 400 and the oil seal 300 is suppressed by the negative pressure.

It should be noted that, because the cavity 310 is formed as a negative pressure cavity and opens toward the oil blocking member 400, the oil entering between the oil blocking member 400 and the oil seal 300 may collide with the inner wall surface of the cavity 310, so as to achieve the purpose of oil-gas separation, the separated oil remains on the inner wall surface of the cavity 310, and along with long-term accumulation, the oil amount is continuously increased, which is that the oil may flow to the contact position of the oil seal 300 and the crankshaft 110, that is, the sealing lip 320 of the oil seal 300 mentioned below, so as to continuously lubricate the sealing lip 320, reduce wear, and further improve the sealing performance of the oil seal 300.

It should be noted that, after oil entering between the oil blocking member 400 and the oil seal 300 impacts on the inner wall surface of the cavity 310 to realize oil-gas separation, the separated gas is discharged in the rotation process of the fan, and the heat generated during sealing of the oil seal 300 can be taken away in the process of gas discharge, so as to achieve the purpose of cooling the oil seal 300, and avoid accelerating aging and abrasion of the oil seal 300 due to abnormal working temperature of the engine, thereby ensuring that the oil seal 300 can work in a stable temperature state under the whole circulation action.

As can be seen from the above, the circulation path of the oil in the present application is: a small part of oil in the crankcase 100 enters a space between the oil blocking member 400 and the oil seal 300 through the guide gap 500; most of the oil in the crankcase 100 will be splashed on the oil baffle 400, and the oil splashed on the oil baffle 400 will be thrown into the crankcase 100 again by the oil baffle 410. And the fluid that gets into in the space between oil blocking piece 400 and the oil blanket 300 can be water conservancy diversion to oil blanket 300 under the effect of water conservancy diversion convex part 211 and in order to lubricate oil blanket 300, and the fluid of water conservancy diversion to oil blanket 300 can strike and carry out oil-gas separation on the internal wall of cavity 310, after oil-gas separation accomplished, the sealed lip 320 of oil blanket 300 is lubricated to the liquid of separation, the gas of separation is discharged to crankcase 100 under the effect of oil blocking piece 400 in, and can also take away the heat on the oil blanket 300 at gas outgoing's in-process, reach and carry out refrigerated purpose to oil blanket 300.

Therefore, this application not only can block on partial fluid splash to oil blanket 300 in the crankcase 100 through setting up pivoted fender oil piece 400, still can reach and lubricate, refrigerated purpose to oil blanket 300 to show the reliability that promotes oil blanket 300.

In some embodiments of the present invention, as shown in fig. 3, a hub 610 of the damper pulley 600 is installed between the crankshaft 110 and the oil seal 300, the oil seal 300 can rotate relative to the hub 610 of the damper pulley 600, and the crankshaft 110 is in sealing engagement with the oil seal 300 through the hub 610. That is, one side of the oil seal 300 is in sealing fit with the hole wall of the mounting hole 210, and the other side of the oil seal 300 is in close contact fit with the oil seal 300 through the hub 610 of the damper pulley 600, so that the oil seal 300 is utilized to realize the isolation between the crankcase 100 and the outside, and the oil in the crankcase 100 is prevented from leaking to the outside and simultaneously, foreign matters such as external dust, sand and dirt are prevented from entering the inside of the crankcase 100.

Alternatively, as shown in fig. 3, the damper pulley 600 is sleeved on one end of the crankshaft 110 and connected to the crankshaft 110 by a fastener 800 to achieve a fixed connection between the damper pulley 600 and the crankshaft 110.

Alternatively, the fastener 800 may be one of a bolt or a screw.

Since the damper pulley 600 is provided, the connection point between the oil seal 300 and the crankshaft 110 can be understood as the contact point between the oil seal 300 and the hub 610 of the damper pulley 600.

Alternatively, as shown in fig. 3, a timing sprocket 700 is installed between the crankshaft 110 and the oil deflector 400, and the oil deflector 400 is installed on the crankshaft 110 by the timing sprocket 700. The timing sprocket 700 is used for providing an installation space for installing the oil blocking member 400, so that the oil blocking member 400 can be positioned stably relative to the crankshaft 110, and the crankshaft 110 can drive the oil blocking member 400 to rotate synchronously in the rotating process, thereby playing an oil blocking role.

Optionally, the hub 610 of the damping pulley 600 and the timing sprocket 700 are sleeved on the crankshaft 110, the crankshaft 110 is used for supporting the damping pulley 600 and the timing sprocket 700, and the crankshaft 110 can drive the damping pulley 600 and the timing sprocket 700 to synchronously rotate in the rotating process.

Optionally, a limiting groove is formed in the timing sprocket 700, and one end of the oil blocking member 400 can be limited in the limiting groove to realize interference fit between the oil blocking member 400 and the timing sprocket 700, so that the position of the oil blocking member 400 is stable relative to the timing sprocket 700, and the crankshaft 110 can drive the oil blocking member 400 to rotate synchronously in the process of driving the timing sprocket 700 to rotate.

Alternatively, when one end of the oil blocking member 400 is limited in the limiting groove, as shown in fig. 4, one side of the oil blocking member 400 may abut against a boss on the timing sprocket 700, and the other side of the oil blocking member 400 may abut against the damping pulley 600, so as to position the oil blocking member 400, and further ensure that the oil blocking member 400 can rotate synchronously with the crankshaft 110.

It should be noted that the connection manner of the damper pulley 600, the timing sprocket 700 and the crankshaft 110 is well known in the art, and will not be described herein.

Alternatively, as shown in fig. 4, a side surface of the oil seal 300 facing the hub 610 is provided with a seal lip 320, and the seal lip 320 abuts on the hub 610. The seal lip 320 can realize close contact fit between the oil seal 300 and the hub 610 of the damper pulley 600, so that oil entering between the oil blocking member 400 and the oil seal 300 cannot flow out from the joint of the seal lip 320 and the hub 610, and the sealing performance of the oil seal 300 is further improved.

Optionally, as shown in fig. 4, a dust lip 330 is further provided on a side of the oil seal 300 facing the hub 610. The dust lip 330 is used to block external dust and prevent the external dust from entering the inside of the crankcase 100.

Alternatively, as shown in fig. 4, the seal lip 320 and the dust lip 330 are disposed at a distance, and the dust lip 330 is disposed away from the oil baffle 400 with respect to the seal lip 320, and also effectively blocks external dust.

In some examples, as shown in fig. 4, in the radial direction of the mounting hole 210, the end of the sealing lip 320 is disposed closer to the hub 610 than the end of the dust lip 330, so that the sealing lip 320 can abut on the hub 610, achieving a close contact fit of the sealing lip 320 and the hub 610.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. An engine assembly (1000), comprising:

a crankcase (100), wherein a crankshaft (110) is arranged in the crankcase (100);

a timing cover (200), the timing cover (200) being provided on one side of the crankcase (100) and having a mounting hole (210);

the oil seal (300) is mounted on the timing cover (200) and is respectively in sealing fit with the hole wall of the mounting hole (210) and the crankshaft (110);

the oil blocking piece (400), the oil blocking piece (400) is installed on the crankshaft (110) and rotates along with the crankshaft (110), and the oil blocking piece (400) is located between the crankcase (100) and the oil seal (300).

2. The engine assembly (1000) according to claim 1, wherein a flow guide gap (500) is formed between a wall of the mounting hole (210) and the oil retainer (400), and a space between the oil retainer (400) and the oil seal (300) communicates with the flow guide gap (500).

3. The engine assembly (1000) according to claim 2, wherein a hole wall of the mounting hole (210) has a flow guide protrusion (211) extending in a direction close to the crankshaft (110), the flow guide protrusion (211) being located between the oil deflector (400) and the oil seal (300).

4. The engine assembly (1000) of claim 3, wherein a projection of the flow guide protrusion (211) on a plane perpendicular to a center line of the mounting hole (210) and a projection of the oil deflector (400) on the plane coincide.

5. The engine assembly (1000) of claim 1, wherein a side of the oil retainer (400) facing away from the oil seal (300) has an oil retaining surface (410), the oil retaining surface (410) gradually approaching the oil seal (300) in a direction away from the crankshaft (110).

6. The engine assembly (1000) of claim 1, wherein the oil retainer (400) is a fan, and blades (420) of the fan are gradually brought close to the oil seal (300) from a blade root (4201) to a blade tip (4202).

7. The engine assembly (1000) of claim 6, wherein the blade root (4201) of the blade (420) is located outside the mounting hole (210) and the tip (4202) of the blade (420) is located inside the mounting hole (210).

8. The engine assembly (1000) according to claim 6, wherein a side of the oil seal (300) facing the oil retainer (400) has a cavity (310), the cavity (310) being open to the oil retainer (400), the cavity (310) being adapted to form a negative pressure chamber when the fan rotates.

9. The engine assembly (1000) of claim 1, wherein a timing sprocket (700) is installed between the crankshaft (110) and the oil blocking member (400), a hub (610) of a damping pulley (600) is installed between the crankshaft (110) and the oil seal (300), the oil blocking member (400) is installed on the crankshaft (110) through the timing sprocket (700), the oil seal (300) can rotate relative to the hub (610) of the damping pulley (600), and the crankshaft (110) is in sealing fit with the oil seal (300) through the hub (610).

10. The engine assembly (1000) of claim 9, wherein a side of the oil seal (300) facing the hub (610) is provided with a sealing lip (320) and a dust lip (330), the sealing lip (320) abutting on the hub (610).

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