CN216467344U - Lubrication protection structure, power assembly and electric automobile - Google Patents

Abstract

The application relates to a lubrication protection structure, a power assembly and an electric automobile. This lubrication protection structure includes: a lubrication guard; the lubricating protection piece is arranged in an inner shaft hole of an input shaft of the speed reducer and is close to a spline pair between an output shaft of the motor and the input shaft of the speed reducer; the lubricating protection piece comprises a lubricating medium collecting portion and a sealing portion which is integrated with the lubricating medium collecting portion, the sealing portion is in sealing contact with the wall surface of the shaft inner hole, and the lubricating medium collecting portion comprises a guide structure which extends from the axis of the input shaft to the spline pair along the circumferential direction. The scheme that this application provided can retrieve the vice lubricated medium that runs off of spline, avoids the vice inefficacy because of lubricated condition of spline, reduces the risk of power assembly trouble.

Description

Lubrication protection structure, power assembly and electric automobile

Technical Field

The application relates to the technical field of vehicles, in particular to a lubrication protection structure, a power assembly and an electric automobile.

Background

In the driving system of the electric automobile, the power of the motor is transmitted to the input shaft of the speed reducer through the output shaft of the motor, and then finally reaches the wheel end through the differential mechanism and the half shaft. The connection between the motor output shaft and the input shaft of the speed reducer is realized through an installed spline pair. The spline pair comprises an inner spline pair and an outer spline pair, the inner spline and the outer spline of the spline pair can rub against each other in the process of transmitting power, and the driving state of the automobile changes to cause impact, so that a lubricating medium needs to be arranged in the spline pair to avoid the spline pair from losing efficacy.

In the related art, since the meshing state of the spline pair is affected by the power output of the motor, when the spline pair rotates at a high speed, the lubricating medium is easily thrown out of the spline pair due to inertia, so that the lubricating medium is gradually lost, and the spline pair loses the lubricating condition. In order to keep the spline pair lubricated, the drive assembly needs to be manually and periodically disassembled and assembled to supplement a lubricating medium, but the whole work flow is complex in operation, consumes manpower and material resources, and influences the use experience of the automobile.

SUMMERY OF THE UTILITY MODEL

For solving or partly solve the problem that exists among the correlation technique, this application provides a lubricated protection architecture, power assembly and electric automobile, can retrieve the vice lubricated medium that runs off of spline, avoids the vice inefficacy because of lubricated condition of spline, reduces the risk of power assembly trouble.

The present application provides in a first aspect a lubrication protection structure comprising:

a lubrication guard; the lubricating protection piece is arranged in an inner shaft hole of an input shaft of the speed reducer and is close to a spline pair between an output shaft of the motor and the input shaft of the speed reducer;

the lubricating protection piece comprises a lubricating medium collecting portion and a sealing portion which is integrated with the lubricating medium collecting portion, the sealing portion is in sealing contact with the wall surface of the shaft inner hole, and the lubricating medium collecting portion comprises a guide structure which extends from the axis of the input shaft to the spline pair along the circumferential direction.

In one embodiment, the lubrication protector includes a body including a lubrication medium collection cavity disposed coaxially with the input shaft, the lubrication medium collection cavity having a closed end and an open end, the open end disposed corresponding to the spline pair;

wherein the guide structure is formed on an inner peripheral wall of the lubrication medium collection chamber and extends from the closed end toward the open end.

In one embodiment, the main body defines a tapered lubricant collection chamber, and the guide structure includes a tapered guide surface formed on an inner wall of the lubricant collection chamber; or

The main body is limited with a conical lubricating medium collecting cavity, and the guide structure comprises a spiral structure formed on the inner wall of the lubricating medium collecting cavity; or

The main body defines a conical lubricating medium collecting cavity, and the guide structure comprises a conical guide surface formed on the inner wall of the lubricating medium collecting cavity, wherein a preset included angle is formed between the conical guide surface and the axial center direction of the input shaft; or

The main body is limited with a tapered lubricating medium collecting cavity, and the guide structure comprises a guide groove formed on the inner wall of the lubricating medium collecting cavity.

In one embodiment, the lubrication protector further comprises a fitting portion in interference fit with a wall surface of the shaft inner hole, and the lubrication protector is limited in the shaft inner hole by the fitting portion.

In one embodiment, the fitting portion includes a flange formed on an outer periphery of the open end and protruding toward a wall surface of the shaft inner hole, the flange being adapted to be in interference fit with the wall surface of the shaft inner hole.

In one embodiment, the sealing portion includes a seal member disposed around an outer periphery of the open end for sealing contact with a wall surface of the shaft bore.

In one embodiment, the seal is disposed on the outer periphery of the open end on a side of the flange facing away from the spline pair and in contact with the flange.

In one embodiment, the flange is integrally formed with the body; and/or

The seal is integral with the body.

A second aspect of the present application provides a powertrain including a lubrication protection structure as described above.

A third aspect of the present application provides an electric vehicle comprising a powertrain as described above.

The technical scheme provided by the application can comprise the following beneficial effects: the lubrication protection structure of the present application includes a lubrication protection member; the lubricating protection piece is arranged in an inner shaft hole of an input shaft of the speed reducer and is close to a spline pair between an output shaft of the motor and the input shaft of the speed reducer; the lubricating protection piece comprises a lubricating medium collecting portion and a sealing portion which is integrated with the lubricating medium collecting portion, the sealing portion is in sealing contact with the wall surface of the shaft inner hole, and the lubricating medium collecting portion comprises a guide structure which extends from the axis of the input shaft to the spline pair along the circumferential direction. The lubricating medium collecting part is arranged, so that the lubricating medium thrown out in the rotation process of the spline pair can be contained and collected, and the spline pair is convenient to recycle, so that the spline pair is prevented from losing efficacy due to insufficient lubricating conditions; still block the lubricating oil that the reduction gear splashes and get into in the input shaft through setting up the sealing, and then avoid the lubricating oil of reduction gear to pass through the vice entering motor of spline to reduce the risk of power assembly trouble.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

The foregoing and other objects, features and advantages of the application will be apparent from the following more particular descriptions of exemplary embodiments of the application as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the application.

FIG. 1 is a schematic cross-sectional view of a powertrain according to an exemplary embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a lubrication protection structure according to an embodiment of the present application.

Reference numerals: the motor 10, the motor output shaft 11, the spline pair 20, the speed reducer 30, the speed reducer input shaft 31, the shaft inner bore 310, the lubrication protector 40, the lubrication medium collection portion 41, the lubrication medium collection chamber 410, the guide structure 4100, the closed end 411, the open end 412, the seal portion 42, the fitting portion 421, the flange 4211, and the seal 422.

Detailed Description

Embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While embodiments of the present application are illustrated in the accompanying drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

It should be understood that although the terms "first," "second," "third," etc. may be used herein to describe various information, these information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present application. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present application, it is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be considered limiting of the present application.

Unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections as well as removable connections or combinations; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In the related art, since the meshing state of the spline pair is affected by the power output of the motor, when the spline pair rotates at a high speed, the lubricating medium is easily thrown out of the spline pair due to inertia, so that the lubricating medium is gradually lost, and the spline pair loses the lubricating condition. In order to keep the spline pair lubricated, the drive assembly needs to be manually and periodically disassembled and assembled to supplement a lubricating medium, but the whole work flow is complex in operation, consumes manpower and material resources, and influences the use experience of the automobile.

To above-mentioned problem, this application embodiment provides a lubrication protection structure, can retrieve the vice lubricated medium that runs off of spline, avoids the vice inefficacy because of the lubricated condition is not enough of spline, reduces the risk of power assembly trouble.

The technical solutions of the embodiments of the present application are described in detail below with reference to the accompanying drawings.

Referring to fig. 1 and 2, the present embodiment provides a lubrication protection structure including: a lubrication protector 40; the lubrication protector 40 is disposed in the shaft inner bore 310 of the input shaft 31 of the speed reducer 30, and is disposed close to the spline pair 20 between the output shaft 11 of the motor 10 and the input shaft 31 of the speed reducer 30; the lubrication protector 40 includes a lubrication medium collection portion 41 and a seal portion 42 integrally formed with the lubrication medium collection portion, the seal portion 42 is in sealing contact with a wall surface of the shaft inner bore 310, and the lubrication medium collection portion 41 includes a guide structure 4100 extending from an axial center of the input shaft 31 in a circumferential direction toward the spline pair 20.

In the power assembly of the automobile, the spline pair 20 is disposed between the motor 10 and the speed reducer 30, and respectively connects a power output end of the motor 10 and a power input end of the speed reducer 30, so as to transmit power driven by the motor 10 to the speed reducer 30. In order to ensure that the spline pair 20 can keep working, a lubricating medium, such as grease, is usually required to lubricate the spline pair, but in the related art, because the rotating speed of the motor output shaft 11 is high, in the process that the spline pair 20 rotates at a high speed along with the motor output shaft 11, the grease used for lubricating the spline pair 20 is easily thrown out by the spline pair 20 due to centrifugal action and runs off, and cannot be recovered, so that the lubricating condition of the spline pair 20 is insufficient, further the spline pair fails, the overall performance of the power assembly is affected, and the power assembly needs to be disassembled for supplementing the grease, so that the maintenance cost of the power assembly is increased.

The lubrication protection structure of the present embodiment is provided with the lubrication protection member 40, and the lubrication protection member 40 is fixed in the shaft inner bore 310 of the reduction gear input shaft 31 and is disposed close to the spline pair 20. The lubricating medium collecting portion 41 corresponding to the spline pair 20 is formed in the lubricating protection member 40, the lubricating medium thrown out by the spline pair 20 in the rotation process can enter the lubricating medium collecting portion 41, and is accommodated by the lubricating medium collecting portion 41, and the lubricating medium is guided to the spline pair 20 through the guiding structure 4100 which is arranged on the lubricating medium collecting portion 41 and faces the spline pair 20, so that the lubricating medium can be recycled, and the condition that the lubricating medium of the spline pair 20 cannot be recycled after being thrown out, and the spline pair 20 is lack of lubricating conditions and fails is avoided.

Since the input shaft 31 of the speed reducer 30 performs high-speed rotation during transmission, the splashed lubricating oil easily flows along the wall surface of the shaft inner hole 310 of the speed reducer input shaft 31 due to high-speed rotation of the gears in the speed reducer 30, is thrown against the spline pair 20, and further flows to the motor 10 through the spline pair 20. The lubrication protection structure of this embodiment is provided with sealing portion 42, and sealing portion 42 butt in the wall of axle hole 310, is separated into the both sides that do not communicate with each other with axle hole 310, forms sealedly between spline pair 20 and reduction gear 30, avoids reduction gear 30's lubricating oil to reveal to motor 10 by spline pair 20 in, influences the condition of the function of motor 10 to the risk of power assembly trouble has been reduced.

Referring to fig. 2, in one embodiment, the lubrication protector 40 includes a body including a lubrication medium collection chamber 410 coaxially disposed with the input shaft 31, the lubrication medium collection chamber 410 having a closed end 411 and an open end 412, the open end 412 disposed corresponding to the spline pair; wherein the guiding structure 4100 is formed on the inner peripheral wall of the lubricating medium collecting chamber 410 and extends from the closed end 411 towards the open end 412 in an inclined manner.

Wherein, the lubricating medium collecting cavity 410 is arranged in the main body and is provided with a space for containing the lubricating medium; the open end 412 is disposed proximate to the spline pair 20 and the open end is disposed toward the spline pair 20, and the closed end 411 is disposed opposite the open end 412, proximate to the reducer 30. The opening through the open end 412 can collect or convey the lubricating medium of the spline pair 20, and the closed end 411 can block the lubricating medium, so that the lubricating medium is prevented from leaking towards the speed reducer 30.

Wherein, the inner peripheral wall of the lubricating medium collecting cavity 410 extends obliquely along the closed end 411 to the open end 412, the part close to the open end 412 of the spline pair 20 has a larger diameter, the part far away from the closed end 411 of the spline pair 20 has a smaller diameter, and the guiding structure 4100 is formed on the inner peripheral wall.

In the present embodiment, the lubricant collection chamber 410 and the transmission input shaft 31 are also coaxially arranged, i.e., the central axis of the lubricant collection chamber 410 and the axis L of the input shaft 31 coincide. When the input shaft 31 rotates, the main body rotates along with the rotation, and the centrifugal action applied to the portion having the larger diameter during the rotation is larger, so that the lubricating medium moves from the closed end 411 having the smaller diameter to the open end 412 having the larger diameter in the lubricating medium collecting chamber 410, for example, moves from the closed end 411 toward the open end 412 in the directions X1 and X2 on the guide structure 4100, and is thrown in the direction of the spline pair 20, and the lubricating medium lost from the spline pair 20 is guided into the spline pair 20, whereby the lubricating medium of the spline pair 20 is recovered, the lubricating medium can be recycled, and the lubricating condition of the spline pair 20 can be effectively improved.

In one embodiment, the body defines a tapered lubrication collection chamber 410, and the guide structure 4100 includes a tapered guide surface formed on an inner wall of the lubrication collection chamber 410.

Wherein, the lubrication medium collection chamber 410 is set to the tapered appearance chamber, can be close to the part of the spline pair 20 and set to the tapered butt, the part of keeping away from the spline pair 20 is set to the tapered tip, the cavity that makes the lubrication medium collection chamber 410 is conical, its interior conical surface forms the tapered guide face of guide structure 4100, and be equipped with the opening at the butt of lubrication medium collection chamber 410, the tip is set to and seals, in the main part rotation process, because the linear velocity difference of lubrication medium collection chamber 410 tip and butt is great, the lubrication medium in the lubrication medium collection chamber 410 can flow to the butt from the tip rapidly along the tapered guide face because of centrifugal action, thereby the speed that the lubrication protection piece 40 retrieves the lubrication medium to the spline pair 20 has been improved, avoid too much lubrication medium to stop in the lubrication medium collection chamber 410 and can's rapid recovery.

In one embodiment, the body defines a tapered lubrication collection chamber 410, and the guiding structure 4100 comprises a helical structure formed on the inner wall of the lubrication collection chamber 410.

Wherein the spiral structure may be a thread surface disposed coaxially with the lubricating medium collecting chamber 4100 for enhancing the flow guiding effect. When the main body rotates, the lubricating medium collected by the lubricating medium collecting cavity 410 can rapidly flow to the spline pair 20 through the flow guiding effect of the spiral surface of the spiral structure, so that the flow guiding speed is increased. The thread of the helical structure may be a triangular thread, a rectangular thread, a zigzag thread, etc., and this embodiment is not particularly limited.

In one embodiment, the main body defines a tapered lubricant collection chamber 410, and the guiding structure 4100 includes a tapered guiding surface formed on an inner wall of the lubricant collection chamber 410, wherein the tapered guiding surface has a predetermined angle with respect to the axial direction of the input shaft 31.

The tapered guide surface is adapted to an inner wall surface of the lubricating medium collecting cavity 410, extends obliquely in a direction from the closed end 411 to the open end 412, and has a preset included angle with an axis of the reducer input shaft 31, the included angle ranges from 0 to 90 degrees, so that the guide surface is tapered, and can convey the lubricating medium in the lubricating medium collecting cavity 410 back to the spline pair 20, the included angle may be, for example, 30 degrees, 45 degrees, 60 degrees, and the like, and the specific value of the included angle is not specifically limited in this embodiment. It can be understood that due to the centrifugal effect, when the preset included angle is large, the flow guide effect of the conical guide surface is also strong, and the size of the preset angle can be adjusted according to requirements.

In one embodiment, the body defines a tapered lubrication collection chamber 410, and the guide structure 4100 includes a guide groove formed in an inner wall of the lubrication collection chamber 410.

The guiding groove may be a groove body opened on the inner wall in the direction from the closed end 411 to the open end 412, and the lubricating medium flows into the guiding groove after entering the lubricating medium collecting cavity 410, and flows to the spline pair 20 under the guiding effect of the guiding groove, so as to realize the recovery of the lubricating medium.

In one embodiment, the main body of the lubricating protection member 40 may be designed to be a tapered structure, a cavity with a matching shape is formed in the main body to form a tapered lubricating medium collecting cavity 410, the tapered lubricating medium collecting cavity 410 ensures the recovery of the lubricating medium of the spline pair, and the main body is designed to be a tapered structure, so that the occupied space is smaller than that of a cylindrical structure, the space utilization rate is improved, the lubricating protection member 40 is easy to be installed in the shaft inner hole 310, and the manufacturing consumables of the lubricating protection member 40 are also saved.

In one embodiment, the lubricating protector 40 further includes a fitting portion 421 that is in interference fit with the wall surface of the shaft inner hole 310, and the lubricating protector 40 is retained in the shaft inner hole 310 by the fitting portion 421.

When the lubrication protection member 40 is installed, the lubrication protection member 40 is installed in the shaft inner hole 310, the matching portion 421 abuts against the wall surface of the shaft inner hole 310, pressure is generated on the wall surface, the displacement is located on the wall surface of the shaft inner hole, and therefore interference fit is achieved, the lubrication protection member 40 is limited in the shaft inner hole 310 and is fixed relative to the input shaft 31. The lubrication protector 40 may be secured to the shaft bore 310 at a predetermined location that is proximate to the spline pair to facilitate recovery of the lubrication medium.

In one embodiment, the fitting portion 421 includes a flange 4211 formed at the outer periphery of the open end 412 and protruding toward the wall surface of the shaft inner hole, and the flange 4211 is used for interference fit with the wall surface of the shaft inner hole 310.

The flange 4211 may be formed to protrude toward the wall surface of the shaft inner hole 310 in a direction away from the rotation axis of the shaft inner hole 310, and may abut against the wall surface of the shaft inner hole 310 during installation and abut against the wall surface of the shaft inner hole 310 through interference fit, so as to improve the stability of connection between the lubrication protector 40 and the input shaft 31. For example, the connection position between the flange 4211 or the mating portion 421 and the flange 4211 is configured to be elastic, when the lubrication protector 40 is installed in the shaft inner hole 310, the flange 4211 is first compressed in the direction of the rotation axis L of the shaft inner hole 310 by pressure, and after the lubrication protector is installed in the preset position of the shaft inner hole 310, the flange 4211 is rebounded to abut against the wall surface of the shaft inner hole 310 due to the pressure release, so that the interference fit is realized. The present embodiment is not particularly limited with respect to the specific shape of the flange 4211.

In one embodiment, the sealing portion 42 includes a seal 422 disposed around the outer periphery of the open end 412, the seal 422 being configured to sealingly contact the wall of the shaft bore 310.

Because the speed reducer 30 can carry out high-speed rotary motion in the power transmission process, gear lubricating oil of the speed reducer 30 easily enters the speed reducer input shaft 31 and flows to the spline pair 20 along the wall surface of the speed reducer input shaft 31 so as to flow to the motor 10.

In the present embodiment, the sealing portion 42 is provided with the sealing member 422 for sealing the shaft inner bore 310, and the sealing member 40 can be used to replace a sealing end cap in the related art, so as to perform the functions of blocking and sealing, prevent the lubricating oil of the input shaft 31 of the speed reducer from entering the spline pair 20 and the motor 10, prevent the lubricating grease of the spline pair 20 from flowing out of the shaft inner bore 310, and ensure that the lubricating grease of the spline pair 20 and the lubricating oil of the speed reducer 30 do not leak out of each other.

In one embodiment, the seal 422 is disposed around the periphery of the open end 412 on a side of the flange 4211 facing away from the spline pair 20 and meets the flange 4211.

After the flange 4211 abuts against the wall surface of the shaft inner hole 310, the hole passage of the shaft inner hole 310 is divided into two sides, one side is the spline pair 20 and the motor 10 side, and the other side is the reducer 30 side. A seal 422 may be provided on the outer periphery of the open end 412 on the side facing away from the spline pair 20 (i.e., adjacent to the reducer 30). Therefore, the sealing element 422 is limited by the flange 4211, the sealing element 422 can be prevented from falling off and losing efficacy when rotating at a high speed, the sealing element 422 and the flange 4211 can both play a role in blocking a lubricating medium of the speed reducer 30, and the sealing performance is improved. Moreover, the sealing piece 422 is arranged on the side away from the spline pair 20, so that the lubricating oil of the speed reducer 30 can be conveniently collected through the sealing piece 422, and the recycling of the lubricating oil is facilitated.

To improve integration and stability, in one embodiment, the flange 4211 is integrally formed with the body; and/or the seal 422 is integral with the body.

The flange 4211 and the main body are integrally formed, so that the lubricating protection piece 40 is convenient to process and manufacture, the integral fixing of the lubricating protection piece 40 can be realized through the interference fit of the flange 4211 and the shaft inner hole 310 when the lubricating protection piece 40 is installed, and the installation mode is simple and convenient. In order to improve the connection strength and thus the stability, the sealing member 422 may be integrated with the main body, and the sealing member 422 may be vulcanized to the main body and fixed to the flange 4211, for example, by a vulcanization process.

In this embodiment, the seal 422 may be adapted to the structure of the lubrication protection member 40 to have the same central axis as the lubrication collection chamber 410, i.e., the central axis L of the seal 422, the lubrication collection chamber 410, and the shaft bore 310 coincide to integrally align the lubrication protection structure 40, the shaft bore 310, and the spline pair 20 so that the lubrication protection structure 40 can maintain the same rotation as the input shaft 31 when the reducer input shaft 31 rotates.

Corresponding to the embodiment of the lubricating protection structure, the application also provides a power assembly, an electric automobile and a corresponding embodiment.

Referring to fig. 1, the present embodiment provides a powertrain including a lubrication protection structure as described in the above embodiments.

In this embodiment, the powertrain further includes a motor 10, a speed reducer 30 and a spline pair 20, the spline pair 20 is respectively connected to the output shaft 11 of the motor 10 and the input shaft 31 of the speed reducer 30, and the lubrication protection member 40 of the lubrication protection structure is disposed in a shaft inner hole 310 formed in the input shaft 31 of the speed reducer 30 and is located close to the spline pair 20. The lubricating medium collecting portion 41 of the lubricating protector 40 can collect and recover the lubricating medium of the spline pair 20, and the lubricating medium is sent back to the spline pair 20 by centrifugal action of rotation. The sealing portion 42 of the lubrication protector 40 can seal the spline pair 20 and the speed reducer 30, and prevent the lubricating oil of the input shaft 31 of the speed reducer from being thrown into the motor 10 through the spline pair 20 and affecting the motor 10.

The embodiment also provides an electric automobile which comprises the power assembly in the embodiment.

The power assembly is installed in the electric automobile, the lubricating medium capable of recycling the spline pair is arranged in the power assembly, the lubricating performance of the power assembly is improved, the service life of the power assembly is prolonged, the original shaft end sealing cover can be replaced, and the space utilization rate and the use performance of the automobile are improved.

The aspects of the present application have been described in detail hereinabove with reference to the accompanying drawings. In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments. Those skilled in the art should also appreciate that the acts and modules referred to in the specification are not necessarily required for the application. In addition, it can be understood that the steps in the method of the embodiment of the present application may be sequentially adjusted, combined, and deleted according to actual needs, and the modules in the device of the embodiment of the present application may be combined, divided, and deleted according to actual needs.

Having described embodiments of the present application, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims (10)

1. A lubrication protection structure, comprising:

a lubrication guard; the lubricating protection piece is arranged in an inner shaft hole of an input shaft of the speed reducer and is close to a spline pair between an output shaft of the motor and the input shaft of the speed reducer;

the lubricating protection piece comprises a lubricating medium collecting portion and a sealing portion which is integrated with the lubricating medium collecting portion, the sealing portion is in sealing contact with the wall surface of the shaft inner hole, and the lubricating medium collecting portion comprises a guide structure which extends from the axis of the input shaft to the spline pair along the circumferential direction.

2. The lubrication protection structure according to claim 1, wherein:

the lubrication protector includes a body including a lubrication medium collection cavity disposed coaxially with the input shaft, the lubrication medium collection cavity having a closed end and an open end, the open end disposed corresponding to the spline pair;

wherein the guide structure is formed on an inner peripheral wall of the lubrication medium collection chamber and extends from the closed end toward the open end.

3. The lubrication protection structure according to claim 2, wherein:

the main body defines a lubricating medium collecting cavity in a conical shape, and the guide structure comprises a conical guide surface formed on the inner wall of the lubricating medium collecting cavity; or

The main body is limited with a conical lubricating medium collecting cavity, and the guide structure comprises a spiral structure formed on the inner wall of the lubricating medium collecting cavity; or

The main body is limited with a conical lubricating medium collecting cavity, the guide structure comprises a conical guide surface formed on the inner wall of the lubricating medium collecting cavity, and a preset included angle is formed between the conical guide surface and the axial direction of the input shaft; or

The main body is limited with a tapered lubricating medium collecting cavity, and the guide structure comprises a guide groove formed on the inner wall of the lubricating medium collecting cavity.

4. The lubrication protection structure according to claim 2, wherein:

the lubricating protection piece further comprises a matching portion in interference fit with the inner wall of the shaft inner hole, and the lubricating protection piece is limited in the shaft inner hole through the matching portion.

5. The lubrication protection structure according to claim 4, wherein:

the cooperation portion including form in the open end periphery, and towards the protruding flange of the wall of axle hole, the flange be used for with the wall interference fit of axle hole.

6. The lubrication protection structure according to claim 5, wherein:

the sealing part comprises a sealing piece which is arranged on the periphery of the opening end in a surrounding mode, and the sealing piece is used for being in sealing contact with the wall surface of the inner hole of the shaft.

7. The lubrication protection structure of claim 6, wherein:

the periphery of the opening end of the sealing element is arranged on one side, away from the spline pair, of the flange, and the sealing element is connected with the flange.

8. The lubrication protection structure of claim 6, wherein:

the flange and the main body are integrally formed; and/or

The seal is integral with the body.

9. A locomotion assembly comprising a lubrication protection structure according to any one of claims 1 to 8.

10. An electric vehicle comprising the powertrain of claim 9.

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