CN220254252U - Power device, electric propeller and movable water area equipment - Google Patents

Abstract

The utility model relates to a power device, an electric propeller and water movable equipment. The driving assembly comprises a motor, a rotating shaft and a speed reducer which are sequentially connected, the motor and the speed reducer are all installed in the shell, the rotating shaft is rotationally connected with the shell, and the motor drives the rotating shaft to rotate. The first sealing piece is located between the motor and the speed reducer, is sleeved on the rotating shaft and is abutted with the shell, and the rotating shaft, the shell and the first sealing piece enclose to form a lubricating cavity. The lubrication cavity is located one side of the first sealing element, which is away from the speed reducer, and is filled with lubricating grease, and the lubricating grease is used for lubricating the first sealing element and jointly isolating lubricating oil contacted with the speed reducer from flowing to the motor. The lubricating grease which can form sealing together with the first sealing piece is filled in the lubricating cavity, so that the leakage of lubricating oil of the speed reducer to the motor is avoided, and the sealing performance is improved.

Description

Power device, electric propeller and movable water area equipment

Technical Field

The application belongs to the technical field of motors, and particularly relates to a power device, an electric propeller and water area movable equipment.

Background

The motor generally comprises a motor, a rotating shaft and a speed reducer, wherein the motor drives the rotating shaft to rotate at a higher rotating speed, the speed reducer is used for reducing the rotating shaft to a proper range, and the torque is increased to adapt to the working condition. The speed reducer and the motor generally have the sealing requirement, and an oil seal contact sealing mode is adopted in common, but the oil seal contact sealing mode is poor in effect.

Disclosure of Invention

The utility model aims to provide a power device, an electric propeller and water movable equipment, so that the risk of leakage of lubricating oil of a speed reducer to a motor is reduced.

In a first aspect, the present utility model provides a power plant comprising: a housing; the driving assembly comprises a motor, a rotating shaft and a speed reducer which are sequentially connected, wherein the motor and the speed reducer are both arranged in the shell, the rotating shaft is rotationally connected with the shell, and the motor drives the rotating shaft to rotate; the first sealing element is positioned between the motor and the speed reducer, the first sealing element is sleeved on the rotating shaft and is in butt joint with the machine shell, the rotating shaft, the machine shell and the first sealing element enclose to form a lubrication cavity, the lubrication cavity is positioned on one side of the first sealing element, which is away from the speed reducer, the lubrication cavity is filled with lubricating grease, the lubricating grease is used for lubricating the first sealing element, and the lubricating grease is jointly isolated with the first sealing element and flows to the motor.

In one embodiment, the rotating shaft comprises a motor shaft and a speed reducer input shaft which are connected with each other to synchronously rotate, wherein the motor shaft is connected with the motor, and the speed reducer input shaft is connected with the speed reducer; the first sealing piece is sleeved on the outer periphery of the speed reducer input shaft or the motor shaft, one side, opposite to the speed reducer input shaft or the motor shaft, of the first sealing piece is abutted to the shell, and at least one of the motor shaft and the speed reducer input shaft, the shell and the first sealing piece enclose to form the lubrication cavity.

In one embodiment, the first sealing member includes an outer peripheral surface facing away from the input shaft of the speed reducer, and a first surface facing toward the motor, where the outer peripheral surface and the first surface are connected and form an included angle, and the first surface and the outer peripheral surface are both attached to an inner wall of the casing.

In one embodiment, the housing includes a first curved surface, the motor shaft includes a second curved surface, the first curved surface and the second curved surface cooperate and have a gap, the gap being in communication with the lubrication chamber.

In one embodiment, the housing includes a first straight surface and a second straight surface connected to form an included angle, and the motor shaft includes a third straight surface and a fourth straight surface connected to form an included angle; the first straight surface and the third straight surface are opposite to each other at intervals, and the second straight surface and the fourth straight surface are opposite to each other at intervals so as to form a gap, and the gap is communicated with the lubrication cavity.

In one embodiment, the casing includes two first protrusions spaced in a radial direction of the input shaft of the speed reducer, a first matching groove is formed between the two first protrusions, the motor shaft includes two second protrusions spaced in a radial direction of the motor shaft, a second matching groove is formed between the two second protrusions, one of the first protrusions is accommodated in the second matching groove, one of the second protrusions is accommodated in the first matching groove, gaps exist between the first protrusions and the motor shaft and between the second protrusions and the casing, the first straight surface and the second straight surface are surfaces of the first protrusions or bottom surfaces of the first matching groove, and the third straight surface and the fourth straight surface are surfaces of the second protrusions or bottom surfaces of the second matching groove.

In one embodiment, the distance between the adjacent first protrusions and the second protrusions in the radial direction of the motor shaft is 0.15mm-0.25mm.

In one embodiment, the motor shaft is provided with an axially extending mounting hole, the mounting hole is communicated with the lubrication cavity, and one end of the input shaft of the speed reducer extends into the mounting hole and is fixedly connected with the motor shaft through a key.

In one embodiment, the power device further comprises a sealing plug, wherein the sealing plug is plugged in the mounting hole and is opposite to the input shaft of the speed reducer at a distance.

In one embodiment, the inner wall of the mounting hole is recessed to form a limiting boss, and the sealing plug comprises a limiting lug, and the limiting lug is abutted to the limiting boss so as to limit the sealing plug to move away from the input shaft of the speed reducer.

In one embodiment, the motor comprises a stator and a rotor, wherein the stator is fixed in the shell, and the rotor is fixed on the rotating shaft; the casing is provided with a circulating water channel, the circulating water channel is used for circulating and flowing a cooling medium, the stator is thermally coupled with the casing, and the cooling medium is thermally coupled with the casing.

In one embodiment, the power device further comprises a second sealing element, the second sealing element is located between the motor and the lubrication cavity, and the second sealing element is sleeved on the rotating shaft and is abutted to the casing.

In a second aspect, the utility model further provides an electric propeller, which comprises a controller, a propeller and the power device according to any one of the embodiments of the first aspect, wherein the controller is electrically connected with the power device, the speed reducer comprises a speed reducer output shaft, and the propeller is fixedly connected with the speed reducer output shaft.

In a third aspect, the utility model also provides a water-area mobile device comprising the electric propulsion device according to the second aspect.

According to the water area movable equipment, the electric propeller and the power device thereof, the rotating shaft, the shell and the first sealing element are arranged to enclose to form the lubrication cavity, the lubrication cavity is positioned on one side of the first sealing element, which is away from the speed reducer, and the lubrication cavity is filled with lubricating grease which can form sealing together with the first sealing element, so that the lubricating oil of the speed reducer is prevented from leaking to the motor, and the sealing performance is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following description will briefly describe the drawings in the embodiments, it being understood that the following drawings only illustrate some embodiments of the present application and should not be considered as limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic perspective view of a power device according to an embodiment of the present utility model;

FIG. 2 is a schematic cross-sectional view of the power plant of FIG. 1;

FIG. 3 is an enlarged schematic view of the structure of the area I of FIG. 2;

FIG. 4a is a partial schematic view of the power plant of the alternative embodiment of FIG. 3;

FIG. 4b is a partial schematic view of the power plant of the alternative embodiment of FIG. 3;

FIG. 4c is a partial schematic view of the power plant of the alternative embodiment of FIG. 3;

FIG. 5 is an enlarged schematic view of the structure of the area II of FIG. 3;

FIG. 6 is a partial schematic view of the power plant of the alternative embodiment of FIG. 3;

FIG. 7a is an enlarged partial schematic view of FIG. 6;

FIG. 7b is a partial schematic view of the power plant of the alternative embodiment of FIG. 7 a;

FIG. 8a is a partial schematic view of the power plant of the alternative embodiment of FIG. 3;

FIG. 8b is a partial schematic view of the power plant of the alternative embodiment of FIG. 3;

FIG. 8c is a partial schematic view of the power plant of the alternative embodiment of FIG. 3;

FIG. 8d is a partial schematic view of the power plant of the alternative embodiment of FIG. 3;

FIG. 9 is a partial schematic view of the power plant of the alternative embodiment of FIG. 3;

FIG. 10 is a schematic perspective view of the motor housing of FIG. 1;

FIG. 11 is a schematic illustration of the motor housing of FIG. 10 after deployment of the circulating water channel;

FIG. 12 is a partial schematic view of the power plant of the alternative embodiment of FIG. 3;

FIG. 13 is a schematic view of an electric propulsion device according to an embodiment of the present utility model;

Fig. 14 is a schematic view of a water area mobile device according to an embodiment of the present utility model.

Detailed Description

The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments.

It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "or/and" as used herein includes any and all combinations of one or more of the associated listed items.

Some embodiments of the present application are described in detail. The following embodiments and features of the embodiments may be combined with each other without collision.

It can be understood that the motor is an electromagnetic device for converting electric energy into mechanical energy according to the law of electromagnetic induction, the speed reducer is generally matched with the motor for use, and a plurality of types of speed reducing transmission structures such as a gear mechanism, a cycloidal pin gear mechanism, a worm mechanism, a planetary gear mechanism and the like are arranged in the speed reducer, and the speed reducing transmission structure has a transmission ratio greater than 1, can output a lower rotating speed of the motor, and simultaneously output a larger torque so as to meet the requirements of actual rotating speed and torque.

When the speed reducer is lubricated by adopting lubricating oil, the oil quantity of the lubricating oil is not too high or too low, the too high oil quantity can generate larger oil stirring loss, and the too low oil quantity can cause insufficient lubrication. Therefore, in order to ensure that the oil quantity of the lubricating oil of the speed reducer is proper, the lubricating oil of the speed reducer is isolated, and if the isolation is good, the lubricating oil of the speed reducer cannot leak, and only the proper oil quantity of the lubricating oil at the initial stage is ensured.

In order to solve the above problems, referring to fig. 1 to 3, an embodiment of the present utility model provides a power device 100, where the power device 100 can be applied to a movable apparatus in a water area, such as a boat, a ship, a water area inspection apparatus, and a water area environment monitoring apparatus, for providing power to the movable apparatus in the water area. The power unit 100 may be applied to land mobile devices such as electric vehicles, electric two-wheeled vehicles, and water-borne unmanned aerial vehicles. The power device 100 can also be applied to air movable equipment such as an aerial unmanned aerial vehicle, or amphibious movable equipment such as an amphibious ship, an amphibious vehicle, and the like. The power plant 100 includes a housing 10, a drive assembly 20, and a first seal 30.

Wherein, drive assembly 20 includes motor 21, pivot 22 and the reduction gear 23 that connect gradually, and motor 21 and reduction gear 23 are all installed in casing 10, and pivot 22 and casing 10 rotate to be connected, and motor 21 drive pivot 22 is rotatory.

The first sealing element 30 is located between the motor 21 and the speed reducer 23, and the first sealing element 30 is sleeved on the rotating shaft 22 and is abutted with the casing 10.

The rotating shaft 22, the casing 10 and the first sealing member 30 enclose a lubrication cavity 90, the lubrication cavity 90 is located on the side, facing away from the speed reducer 23, of the first sealing member 30, the lubrication cavity 90 is filled with grease (not shown), the grease is used for lubricating the first sealing member 30, and lubricating oil (not shown) in contact with the speed reducer 23 is jointly isolated from flowing to the motor 21 with the first sealing member 30. Preferably, the grease is filled in the lubrication chamber 90, and a better sealing effect can be obtained.

Generally, the viscosity coefficient of the lubricating oil is small, the lubricating oil is liquid at normal temperature, the fluidity is strong, and the volatility is slightly high; the viscosity coefficient of the lubricating grease is larger, the lubricating grease is usually pasty at normal temperature, and the fluidity and the volatility are slightly weak.

By arranging the rotating shaft 22, the casing 10 and the first sealing element 30 to enclose to form a lubrication cavity 90, the lubrication cavity 90 is positioned on one side of the first sealing element 30 away from the speed reducer 23, and lubricating grease capable of forming a seal together with the first sealing element 30 is filled in the lubrication cavity 90 so as to prevent lubricating oil of the speed reducer 23 from leaking to the motor 21.

In addition, since the first sealing member 30 is fixedly connected with the casing 10 and sleeved on the rotating shaft 22 to prop against the rotating shaft 22, there is a need for lubrication between the first sealing member 30 and the rotating shaft 22, at high rotation speed, the rotation speed of the motor 21 is higher, and the speed reducer 23 is driven by the motor 21 to rotate to generate enough centrifugal force, so that enough lubrication oil can reach the position of the first sealing member 30 to lubricate the first sealing member 30, but at low rotation speed, the centrifugal force generated by the rotation of the speed reducer 23 is relatively smaller, the centrifugal force applied by the lubrication oil is smaller, so that the lubrication oil can reach the position of the first sealing member 30 (or the quantity of the lubrication oil reaching the first sealing member 30 is too small), and the first sealing member 30 is easy to damage due to insufficient lubrication. If the amount of the lubricating oil in the speed reducer 23 is increased to satisfy the lubrication of the first seal member 30, the speed reduction transmission mechanism in the speed reducer 23 is excessively immersed in the oil, and the loss during operation is excessively high, so that unreasonable heat is generated, which is not yet reimbursed.

In the power device 100 provided by the embodiment of the utility model, the lubricating grease filled in the lubricating cavity 90 formed by enclosing the first sealing element 30, the casing 10 and the rotating shaft 22 and located on the side, facing away from the speed reducer 23, of the first sealing element 30 not only can play a role in sealing and isolating the lubricating oil of the speed reducer 23 together with the first sealing element 30, but also can make up for lubricating the first sealing element 30 when the rotating speed of the speed reducer 23 is lower, so that the first sealing element 30 under the working condition of high rotating speed or low rotating speed can be reasonably lubricated.

The following describes in detail the various components of the power plant 100 provided by embodiments of the present utility model.

Referring to fig. 1 to 2, a casing 10 includes a motor casing 11, a reducer casing 12, a motor end cover 13 and a reducer end cover 14, the motor casing 11 and the reducer casing 12 are fixedly connected by screws, the motor end cover 13 is fixedly connected to a side of the motor casing 11, which is opposite to the reducer casing 12, and the reducer end cover 14 is fixedly connected to a side of the reducer casing 12, which is opposite to the motor casing 11, by screws. The motor housing 11 has a first chamber 111 accommodating the motor 21, and the decelerator housing 12 has a second chamber 121 accommodating the decelerator 23. In this embodiment, the motor housing 11, the reducer housing 12, the motor end cover 13, and the reducer end cover 14 are of a split type structure, and are fixedly connected to each other by screws, while in other embodiments, the casing 10 may be of a partially/completely integrated structure, for example, the reducer housing 12 and the reducer end cover 14 may be integrally formed by casting.

The power device 100 further comprises a controller housing 70, the controller housing 70 is fixedly connected to one side of the motor end cover 13, which is opposite to the motor housing 11, the controller housing 70 is used for installing a controller (not shown), and the controller can control parameters such as power and steering of the motor 21 in the power device 100, can also be used for monitoring state changes of the motor 21, and can protect the motor 21 in time. In other embodiments, the power plant 100 may not include the controller housing 70. Alternatively, in other embodiments, the power plant 100 may include both a controller and a controller housing 70.

The speed reducer 23 includes a speed reduction gear 231 and a speed reducer output shaft 232 both located in the second chamber 121, the speed reduction gear 231 and the speed reducer output shaft 232 are fixedly connected, and the speed reduction gear 231 is meshed with the rotating shaft 22 to provide a gear ratio greater than 1 so as to achieve speed reduction. The second chamber 121 is provided with lubricating oil which lubricates the reduction gear 231, the reduction gear output shaft 232, and the like. The reducer output shaft 232 is rotationally connected to the reducer casing 12 and the reducer end cover 14 through two first bearings 41 on two axial sides, in this embodiment, the reducer 23 is in the form of a reduction gear 231, and in other embodiments, the reducer 23 may also adopt other types of reduction transmission structures such as a cycloidal pin gear mechanism, a worm mechanism, a planetary gear mechanism, and the like, and the utility model is not limited to the specific type of the reducer 23.

The rotary shaft 22 includes a motor shaft 221 and a decelerator input shaft 222 connected to each other to rotate synchronously, wherein the motor shaft 221 is located in the first chamber 111 and is rotatably connected to the motor housing 11 and the motor cover 13 through two second bearings 42 at both sides in the axial direction, and the motor shaft 221 is also connected to the motor 21 to be driven to rotate by the motor 21. The reducer input shaft 222 is located in the second chamber 121 and extends into the first chamber 111 to be fixedly connected with the motor shaft 221. The reducer input shaft 222 is rotatably connected to the reducer casing 12 and the reducer end cover 14 via two third bearings 43 on both axial sides, respectively. The speed reducer input shaft 222 is a gear shaft, the gear portion of which is located between the two third bearings 43 and meshes with the reduction gear 231 (the number of teeth of the speed reducer input shaft 222 is smaller than that of the reduction gear 231 to achieve a gear ratio greater than 1). In this embodiment, the input shaft 222 and the motor shaft 221 of the speed reducer are connected through a spline, and in other embodiments, the input shaft 222 and the motor shaft 221 of the speed reducer may be fixed through a key link, a forming connection, an expanding sleeve connection, a pin connection, a fastening screw connection, an interference connection, a coupling, or the like, or the input shaft 222 and the motor shaft 221 of the speed reducer are integrally formed and designed, and no fixing structure is needed.

In this embodiment, referring to fig. 3, the input shaft 222 of the speed reducer extends into the first chamber 111 to be fixedly connected with the motor shaft 221. In other embodiments, referring to fig. 4a, the motor shaft 221 may also extend into the second chamber 121 and be fixedly connected to the reducer input shaft 222. When the reducer input shaft 222 and the motor shaft 221 are in spline connection, the positions of the internal spline 16 and the external spline 17 can be arranged according to the overall structural design requirement of the power device 100, and meanwhile, the first sealing element 30 can be sleeved on the reducer input shaft 222 or the motor shaft 221, so that the lubrication cavity 90 is formed by enclosing at least one of the motor shaft 221 and the reducer input shaft 222, the casing 10 and the first sealing element 30.

In this embodiment, referring to fig. 3, the motor shaft 221 is provided with an axially extending mounting hole 2211, the mounting hole 2211 is communicated with the lubrication cavity 90, one end of the input shaft 222 of the speed reducer is provided with an external spline 17 and extends into the mounting hole 2211, the corresponding position of the mounting hole 2211 is provided with an internal spline 16, and the internal spline 16 is matched with the external spline 17, so that the motor shaft 221 and the input shaft 222 of the speed reducer are circumferentially fixed. The first sealing member 30 is sleeved on the outer periphery of the input shaft 222 of the speed reducer, and one side, facing away from the input shaft 222 of the speed reducer, of the first sealing member 30 is abutted against the shell 12 of the speed reducer, and the first sealing member 30, the motor shaft 221, the input shaft 222 of the speed reducer and the shell 12 of the speed reducer enclose to form a lubrication cavity 90. By the design, the internal spline 16 and the external spline 17 can be lubricated by the lubricating grease filled in the lubricating cavity 90, abrasion of spline connection is reduced, and service lives of the input shaft 222 and the motor shaft 221 of the speed reducer are prolonged.

In another embodiment, referring to fig. 4a, the input shaft 222 of the speed reducer is provided with an axially extending mounting hole 2221, one end of the motor shaft 221 is provided with an external spline 17 and extends into the mounting hole 2221 of the input shaft 222 of the speed reducer in the second accommodating cavity 121, the corresponding position of the mounting hole 2221 is provided with an internal spline 16, and the internal spline 16 and the external spline 17 are matched, so that the motor shaft 221 and the input shaft 222 of the speed reducer are circumferentially fixed. The first sealing member 30 is sleeved on the periphery of the motor shaft 221, one side, facing away from the motor shaft 221, of the first sealing member 30 is in contact with the speed reducer shell 12, and the first sealing member 30, the motor shaft 221 and the speed reducer shell 12 enclose to form a lubrication cavity 90. The mounting hole 2221 is not in communication with the lubrication chamber 90, but is in communication with the second chamber 121, and it will be appreciated that the mounting hole 2221 is a through hole along the axial direction of the input shaft 222 of the speed reducer, and that the motor shaft 221 extends into an end of the mounting hole 2221 remote from the speed reducer 23 (the end is located in the second chamber 121) and is in keyed engagement with the internal spline 16 of the mounting hole 2221 via the external spline 17, and there will be a gap in the spline engagement, resulting in the mounting hole 2221 being in communication with the second chamber 121 in fact, and that the lubrication oil in the second chamber 121 may enter the spline engagement position for lubrication. The internal spline 16 and the external spline 17 can be lubricated by the lubricating oil of the second chamber 121 to reduce wear of the spline coupling.

In another example, referring to fig. 4b, the difference from the previous embodiment is that the first seal member 30 in this embodiment is sleeved on the outer periphery of the input shaft 222 of the speed reducer instead of the outer periphery of the motor shaft 221, and the side of the first seal member 30 facing away from the input shaft 222 of the speed reducer abuts against the casing 12 of the speed reducer, so that the first seal member 30, the motor shaft 221, the input shaft 222 of the speed reducer and the casing 12 of the speed reducer enclose to form a lubrication cavity 90, the lubrication cavity 90 is communicated with the mounting hole 2221, and the internal spline 16 and the external spline 17 can be lubricated by the grease filled in the lubrication cavity 90, so as to reduce the abrasion of the spline connection.

In still another embodiment, referring to fig. 4c, unlike the present embodiment, the first seal member 30 is sleeved on the outer periphery of the motor shaft 221 instead of the input shaft 222 of the speed reducer, and the side of the first seal member 30 facing away from the motor shaft 221 is abutted and fixed with the speed reducer shell 12, so that the first seal member 30, the motor shaft 221 and the speed reducer shell 12 enclose a lubrication cavity 90, and the mounting hole 2211 is not communicated with the lubrication cavity 90 but is communicated with the second cavity 121, as in the embodiment corresponding to fig. 4a, the mounting hole 2221 in this embodiment is actually communicated with the second cavity 121, so that the internal spline 16 and the external spline 17 can be lubricated by the lubricating oil of the first cavity 111 to reduce the abrasion of the spline connection.

In the above-provided embodiments, the first seal 30 is in contact with the speed reducer case 12, and in other embodiments, the first seal 30 may be in contact with the motor case 11, and the specific position where the first seal 30 is in contact with the casing 10 is not limited in this application.

In this embodiment, referring to fig. 3, the power device 100 further includes a sealing plug 50. The sealing plug 50 is disposed in the mounting hole 2211 in close opposition to the decelerator input shaft 222 at a spacing. It will be appreciated that the mounting bore 2211 is configured as a through bore and that grease from the lubrication chamber 90, while lubricating the spline structure, runs the risk of grease passing through the spline structure and leaking out of contact with the motor 21 from the other side of the mounting bore 2211 (of course, in other embodiments, the mounting bore 2211 may be configured as a blind bore so that there is no risk of grease leaking out of the other side of the mounting bore 2211 away from the reducer input shaft 222). In order to avoid this, the sealing plug 50 is provided in the mounting hole 2211 to block, and even if grease passes through the spline structure, the sealing plug 50 stays in the mounting hole 2211, so that the motor 21 is not threatened.

Specifically, the mounting hole 2211 has an inner wall 2212 extending axially along the mounting hole 2211 and penetrating the mounting hole 2211, and the inner wall 2212 is partially recessed to form a limit boss 2213. The sealing plug 50 comprises a main body 51 and a limiting lip 52, the main body 51 is cylindrical, and the limiting lug 52 is connected to the edge of the main body 51. The body portion 51 is interference fit in the mounting hole 2211, and the limiting lug 52 abuts against the limiting boss 2213 to limit movement of the sealing plug 50 away from the reducer input shaft 222. By the arrangement, the sealing plug 50 is convenient to install, and the sealing plug 50 can be prevented from falling off the mounting hole 2211, so that grease is prevented from leaking.

In this embodiment, referring to fig. 3 and 5, the first seal member 30 includes an outer peripheral surface 311 facing away from the input shaft 222 of the speed reducer, and a first surface 331 facing the motor 21. The outer peripheral surface 311 and the first surface 331 are connected and form an included angle, and the first surface 331 and the outer peripheral surface 311 are attached to the inner wall of the casing 10. Specifically, the first seal 30 is configured as an oil seal, and has an annular shape and includes an outer edge 31, an inner edge 32, and a connecting plate 33 connecting the inner edge 32 and the outer edge 31, the outer peripheral surface 311 of the first seal 30 is a surface of the outer edge 31 facing away from the inner edge 32, and the first surface 331 is a surface of the connecting plate 33 facing the motor 21. The inner edge 32 protrudes outward from the outer edge 31 to form a seal lip 321, and the seal lip 321 abuts against the outer periphery of the input shaft 222 of the speed reducer to realize dynamic sealing. Specifically, the casing 10 includes a stepped abutment 122, which includes a stepped surface 1221, and the outer peripheral surface 311 and the first surface 331 of the first seal 30 are both bonded to the stepped surface 1221.

It will be appreciated that the outer peripheral surface 311 and the first surface 331 of the first sealing member 30 are both attached to the inner wall of the casing 10, so that the position of the first sealing member 30 in the casing 10 can be limited, and in particular, the first surface 331 facing the motor 21 is attached to the inner wall of the casing 10, so that the lubricating oil on the side of the speed reducer 23 can be effectively prevented from passing through the first sealing member 30.

In this embodiment, referring to fig. 3 and 5, the housing 10 includes a first straight surface 1001 and a second straight surface 1002 connected to each other and forming an included angle. The motor shaft 221 includes a third straight face 2001 and a fourth straight face 2002 connected and forming an included angle. The first straight surface 1001 and the third straight surface 2001 are opposed at intervals, and the second straight surface 1002 and the fourth straight surface 2002 are opposed at intervals to form a gap 91, and the gap 91 communicates with the lubrication chamber 90. Specifically, the first straight surface 1001, the second straight surface 1002, the third straight surface 2001 and the fourth straight surface 2002 are all annular surfaces, and on a section passing through an axis of the motor shaft 221, projections of the first straight surface 1001, the second straight surface 1002, the third straight surface 2001 and the fourth straight surface 2002 are two symmetrical straight lines. Since the first straight surface 1001 and the second straight surface 1002 form an angle, the third straight surface 2001 and the fourth straight surface 2002 form an angle, so that the formed gap 91 extends in a bending manner. Because the motor shaft 221 and the housing 10 have the requirement of relative rotation, the motor shaft 221 and the housing 10 need to avoid interference, by arranging the first straight surface 1001 and the third straight surface 2001 to be opposite at intervals, the second straight surface 1002 and the fourth straight surface 2002 are opposite at intervals so as to form a gap 91, no contact is generated between the motor shaft 221 and the housing 10, no interference is generated, and meanwhile, the formed bent and extended gap 91 can better avoid the contact of lubricating grease in the lubricating cavity 90 with the motor 21 after passing through the gap 91.

Further, with continued reference to fig. 3 and 5, the casing 10 includes two first protrusions (15A, 15B) spaced apart in the radial direction of the input shaft 222 of the reduction gear, and a first fitting groove 1010 is formed between the first protrusions 15A and 15B. The motor shaft 221 includes two second protrusions (25A, 25B) spaced apart in a radial direction thereof, and a second fitting groove 2010 is formed between the second protrusions 25A and 25B. One of the first protrusions (15A or 15B) is received in the second coupling groove 2010, and one of the second protrusions (25A or 25B) is received in the first coupling groove 1010, and there are gaps 91 between the first protrusions (15A, 15B) and the motor shaft 221 and between the second protrusions (25A, 25B) and the housing 10. The first straight surface 1001 and the second straight surface 1002 are the surfaces of the first protrusions (15A or 15B) or the bottom surfaces of the first mating grooves 1010, and the third straight surface 2001 and the fourth straight surface 2002 are the surfaces of the second protrusions (25A, 25B) or the bottom surfaces of the second mating grooves 2010.

Specifically, the first protrusion 15A, the first protrusion 15B, the second protrusion 25A and the second protrusion 25B are annular protrusions, and in a direction of the radial direction of the input shaft 222 and away from the input shaft 222, the second protrusion 25A, the first protrusion 15A, the second protrusion 25B and the first protrusion 15B are sequentially arranged at intervals (i.e., the first protrusion 15A is accommodated in the second mating groove 2010 and the second protrusion 25B is accommodated in the first mating groove 1010), and meanwhile, a gap 91 exists between the first protrusion 15A and the bottom surface of the second mating groove 2010, and a gap 91 exists between the second protrusion 25B and the bottom surface of the first mating groove 1010, so that a bent and extended gap 91 is formed, so that the risk of grease passing through the gap 91 in the lubrication cavity 90 is further reduced. The first straight surface 1001 is a side surface of the first protrusion 15A facing the input shaft 222 of the speed reducer, the second straight surface 1002 is an end surface of the first protrusion 15A, the third straight surface 2001 is a side surface of the second protrusion 25A facing away from the input shaft 222 of the speed reducer, and the fourth straight surface 2002 is a bottom surface of the second mating groove 2010.

In addition, the housing 10 further includes a straight surface 1003, a straight surface 1004, and a straight surface 1005, and the motor shaft 221 further includes a straight surface 2003, a straight surface 2004, and a straight surface 2005, wherein the straight surface 1003 is a side surface of the first protrusion 15A facing away from the second protrusion 25A, the straight surface 1004 is a bottom surface of the first fitting groove 1010, the straight surface 1005 is a side surface of the first protrusion 15B facing the first protrusion 15A, the straight surface 2003 is a side surface of the second protrusion 25B facing the straight surface 1003, the straight surface 2004 is an end surface of the second protrusion 25B facing the straight surface 1004, and the straight surface 2005 is a side surface of the second protrusion 25B facing the straight surface 1005. Preferably, any two adjacent straight surfaces on the housing 10 are perpendicular to each other, and any two adjacent straight surfaces on the motor shaft 221 are perpendicular to each other.

In this embodiment, the first protrusion 15A is accommodated in the second mating groove 2010, and the second protrusion 25B is accommodated in the first mating groove 1010. In other embodiments, the first protrusion 15B may be accommodated in the second mating groove 2010, the second protrusion 25A may be accommodated in the first mating groove 1010, and the positions of the straight surfaces such as the first straight surface 1001 and the second straight surface 1002 may be correspondingly changed, which is also one of the concepts of the present utility model. And, the manner of forming the straight surface by the "" shaped protrusion and the "" shaped mating groove is only one of the concepts of the present utility model, and several other manners of forming the straight surface will be described below.

Specifically, referring to the figure, the distance between the adjacent first protrusions (15A, 15B) and second protrusions (25A, 25B) in the radial direction of the motor shaft 221 is 0.15mm-0.25mm. Specifically, the distance between the first straight surface 1001 and the third straight surface 2001, the distance between the straight surface 1003 and the straight surface 2003, and the distance between the straight surface 1005 and the straight surface 2005 are all in the range of 0.15mm to 0.25mm. The distance may be specifically 0.15mm, 0.17mm, 0.2mm, 0.21mm, 0.25mm, etc., preferably 0.2mm. Through setting the radial distance between adjacent first bulges (15A, 15B) and second bulges (25A, 25B) of motor shaft 221 to be between 0.15mm and 0.25mm, clearance 91 with reasonable size can be formed between motor shaft 221 and casing 10, and assembly difficulty and manufacturing difficulty are lower when possessing better sealed effect.

In another embodiment, referring to fig. 6 and 7a, the motor shaft 221 includes a V-shaped protrusion 26, and the housing 10 is provided with a V-shaped groove 16, and the V-shaped protrusion 26 is accommodated in the V-shaped groove 16 and keeps a distance from a groove surface of the V-shaped groove 16. The two groove surfaces of the V-shaped groove 16, i.e., the first straight surface 1001 and the second straight surface 1002, may form a right angle of 90 ° or may form an obtuse or acute angle other than 90 °. The V-shaped protrusion 26 has two surfaces, namely, a third straight surface 2001 and a fourth straight surface 2002, the third straight surface 2001 being opposite to the first straight surface 1001, and the fourth straight surface 2002 being opposite to the second straight surface 1002. The housing 10 further includes a first extension surface 109 connected to an end of the first straight surface 1001 remote from the second straight surface 1002, and the motor shaft 221 further includes a second extension surface 209 connected to an end of the third straight surface 2001 remote from the fourth straight surface 2002, where the first extension surface 109 and the second extension surface 209 are opposite and have a gap, and are both perpendicular to an axial direction of the motor shaft 221. The first extending surface 109, the first straight surface 1001 and the second straight surface 1002 are sequentially connected to form a combined surface, and the gap 91 formed between the combined surfaces formed by sequentially connecting the second extending surface 209, the third straight surface 2001 and the fourth straight surface 2002 is bent and extends, so that a good sealing effect is achieved, and the risk of lubricating oil leakage can be effectively reduced. In other embodiments, referring to fig. 7b, the motor shaft 221 is not provided with the second extension surface 209, the housing 10 is not provided with the first extension surface 109, and the V-shaped protrusion 26 and the V-shaped groove 16 are only matched to form the V-shaped gap 91, so that the V-shaped gap 91 has a better sealing effect.

In another embodiment, referring to fig. 8a, the housing 10 includes a first curved surface 104, and the motor shaft 221 includes a second curved surface 204. The first curved surface 104 and the second curved surface 204 are in curved fit and have a gap 91, and the gap 91 communicates with the lubrication chamber 90. Specifically, the first curved surface 104 and the second curved surface 204 are both toroidal, and on a section passing through an axis of the motor shaft 221, projections of the first curved surface 104 and the second curved surface 204 are both curved. It will be appreciated that the first curved surface 104 and the second curved surface 204 are curved to mate and have a gap 91, i.e., the contours of the two curves are substantially identical, forming a gap 91 extending along the curve. Preferably, the two curves are parallel to each other, i.e. the width of the gap 91 is uniform. Because the motor shaft 221 and the casing 10 have the requirement of relative rotation, the motor shaft 221 and the casing 10 need to avoid interference, and the first curved surface 104 and the second curved surface 204 are arranged to be in curved surface fit and provided with the gap 91, so that the motor shaft 221 and the casing 10 are in non-contact, interference cannot be generated, and meanwhile, the curved extending gap 91 formed by the curved surface fit can better avoid the contact of lubricating grease in the lubricating cavity 90 with the motor after passing through the gap 91.

In another embodiment, referring to fig. 8b, the housing 10 further includes a second surface 105 connected to the first curved surface 104, and the motor shaft 221 further includes a third surface 205 connected to the second curved surface 204, and the second surface 105 is opposite to the third surface 205. The combined surface formed by connecting the first curved surface 104 and the second surface 105 and the combined surface formed by connecting the second curved surface 204 and the third surface 205 form a gap 91 which comprises two parts of linear extension and curved extension, and better tightness is achieved.

In another embodiment, referring to fig. 8c, the first curved surface 104 and the second curved surface 204 are both S-shaped, and the first curved surface 104 and the second curved surface 204 are curved to form an S-shaped gap 91, so that good sealing performance is achieved.

In another embodiment, referring to fig. 8d, the first curved surface 104 and the second curved surface 204 are both S-shaped, the housing 10 further includes a first extending surface 109 connected to one end of the first curved surface 104, the motor shaft 221 further includes a second extending surface 209 connected to one end of the second curved surface 204, a combined surface formed by connecting the first extending surface 109 and the first curved surface 104, and a gap 91 formed between the combined surfaces formed by connecting the second extending surface 209 and the second curved surface 204 includes two parts of linear extension and S-shaped curve extension, so as to have better tightness.

In addition to the straight-face and straight-face mating, curved-face and curved-face mating embodiments, the present utility model provides another such embodiment, referring to fig. 9, the housing 10 includes a first curved surface 104 extending along an "S" shape, the motor shaft 221 includes a curved surface 206, and the curved surface 206 includes a plurality of surfaces connected at angles sequentially in a direction along a radial direction of the motor shaft 221 and away from the motor shaft 221. The bending surface 206 is opposite to the first curved surface 104 to form a gap 91 extending in a special-shaped bending manner, so that better sealing performance is achieved.

It will be appreciated that the two embodiments described above and the various embodiments corresponding thereto are intended to form a non-linearly extending gap 91 to form a non-contact seal between the motor shaft 221 and the housing 10.

In the present embodiment, referring to fig. 3 and 10, the motor 21 includes a stator 212 and a rotor 211. The stator 212 is fixedly installed in the casing 10, and the rotor 211 is fixed to the rotation shaft 22. The casing 10 is provided with a circulating water channel 125, the circulating water channel 125 is used for circulating a cooling medium, the stator 212 is thermally coupled with the casing 10, and the cooling medium is thermally coupled with the casing 10. Specifically, the circulating water channel 125 is disposed at a position of the casing 10 adjacent to the stator 212, so as to conduct heat of the stator 212. The motor 21 may be selected from a direct current motor, an asynchronous motor or a synchronous motor, preferably a three-phase asynchronous motor. It will be appreciated that the stator 212 has coil windings thereon which are energized to generate a high level of heat which needs to be conducted away in time to avoid heat build up. By providing the circulation water channel 125 in the casing 10, heat generated by the stator 212 can be taken away through circulation of the cooling medium, so as to avoid burning out.

Specifically, referring to fig. 3, 10 and 11, the circulating water channel 125 is formed in the outer wall of the motor casing 11 and extends along the circumferential direction in a meandering manner, so that the cooling medium can flow from one side of the motor end cover 13 to one side of the reducer casing 12, and then flow from one side of the reducer casing 12 back to one side of the motor end cover 13, so as to flow back and forth, thereby forming a longer circulating water channel 125, and being beneficial to fully taking away the heat of the stator 212. The outer peripheral wall of the motor casing 11 is provided with a water inlet 127 and a water outlet 126 which are communicated with the circulating water channel 125, the water inlet 127 is used for inputting cooling medium into the circulating water channel 125, and the water outlet 126 is used for discharging the cooling medium which absorbs the heat of the stator 212 through the circulating water channel 125. Further, the inner wall of the circulation water channel 125 is provided with a plurality of elongated protrusions 1252, and the plurality of elongated protrusions 1252 extend in the axial direction, so that the contact area between the cooling medium and the motor housing 11 is increased without affecting the flow speed of the cooling medium, thereby improving the heat exchange efficiency.

In other embodiments, the circulating water channel 125 may also be disposed to extend to a position adjacent to the housing 10, the first sealing member 30 and the lubrication chamber 90, and the heat generated by friction between the first sealing member 30 and the rotating shaft 22 and the accumulated heat of the grease in the lubrication chamber 90 during the lubrication process are timely taken away by using the circulation of the cooling medium, so as to improve the service life of the first sealing member 30 and ensure the lubrication effect of the grease.

In other embodiments, referring to fig. 3 and 12, the power plant 100 of this embodiment is different from the present embodiment in that it further includes a second seal 80. The second sealing member 80 is located between the motor 21 (rotor 211) and the lubrication chamber 90, and the second sealing member 80 is sleeved on the rotating shaft 22 and abuts against the casing 10. Specifically, the second seal 80 is sleeved on the outer periphery of the motor shaft 221, and a side of the second seal 80 facing away from the motor shaft 221 is in contact with the reducer casing 12. Preferably, the second seal 80 is configured as an oil seal. It will be appreciated that by adding the second seal 80, the risk of lubricating oil contacting the motor 21 can be further reduced by providing a further seal on the side of the lubrication chamber 90 adjacent the motor 21. Further, the second sealing member 80 is located on the side of the non-contact sealing structure 18 facing the motor 21, where the non-contact sealing structure 18 forms a seal with the lubrication cavity 90, and a cavity 93 is formed between the non-contact sealing structure 18, and grease can be filled in the cavity 93 to lubricate the second sealing member 80, and a seal with better sealing performance is formed by the grease in the cavity 93 and the second sealing member 80. In addition, the above embodiments have been described in detail (such as straight-face, curved-face, concave-convex, etc. embodiments) for the contactless seal structure 18, and will not be described herein.

Referring to fig. 1 and 13, an embodiment of the present utility model further provides an electric propulsion device 500, where the electric propulsion device 500 is preferably applied to a water area mobile device such as a boat, a ship, an electric surfboard, a water area inspection device, a water area environment monitoring device, and the like, and is used for providing power for the water area mobile device. The electric propeller 500 may be an inboard machine, an outboard machine, or preferably an inboard machine. The electric propeller 500 includes a controller 200, a propeller 300, and the power plant 100 provided by the present utility model. The controller 200 is mounted on the controller housing 70 of the power plant 100 and is electrically connected to the power plant 100, and the decelerator output shaft 232 of the decelerator 23 is fixedly connected to the propeller 300 through the stern shaft 310. Specifically, the controller 200 is used for controlling parameters such as rotation speed and steering of the motor 21 in the power device 100, and may also be used for monitoring state changes of the motor 21 to protect the motor 21 in time. The propeller 300 is rotated by the power unit 100, and the propeller 300 continuously pushes a large amount of a propulsion medium (e.g., water) backward to generate propulsion. By adding the power device 100 provided by the utility model into the electric propeller 500, the electric propeller 500 has higher reliability.

Referring to fig. 14, the embodiment of the present utility model further provides a water area movable apparatus 1000, where the water area movable apparatus 1000 includes the electric propulsion device 500 provided by the present utility model. The water movable apparatus 1000 further includes a water carrier 600 and a battery 700, and the electric propulsion device 500 is mounted to the water carrier 600 to provide propulsion force to the water carrier 600. Battery 700 provides power to controller 200 and power plant 100. By adding the electric propeller 500 provided by the utility model into the water movable equipment 1000, the reliability of the water movable equipment 1000 is improved.

The above embodiments are only for illustrating the technical solution of the present application and not for limiting, and although the present application has been described in detail with reference to the above preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present application may be modified or substituted without departing from the spirit and scope of the technical solution of the present application.

Claims (14)

1. A power plant, comprising:

a housing;

the driving assembly comprises a motor, a rotating shaft and a speed reducer which are sequentially connected, wherein the motor and the speed reducer are both arranged in the shell, the rotating shaft is rotationally connected with the shell, and the motor drives the rotating shaft to rotate;

The first sealing element is positioned between the motor and the speed reducer, the first sealing element is sleeved on the rotating shaft and is in butt joint with the machine shell, the rotating shaft, the machine shell and the first sealing element enclose to form a lubrication cavity, the lubrication cavity is positioned on one side of the first sealing element, which is away from the speed reducer, the lubrication cavity is filled with lubricating grease, the lubricating grease is used for lubricating the first sealing element, and the lubricating grease is jointly isolated with the first sealing element and flows to the motor.

2. The power plant according to claim 1, characterized in that:

the rotating shaft comprises a motor shaft and a speed reducer input shaft which are connected with each other to synchronously rotate, the motor shaft is connected with the motor, and the speed reducer input shaft is connected with the speed reducer;

the first sealing piece is sleeved on the outer periphery of the speed reducer input shaft or the motor shaft, one side, opposite to the speed reducer input shaft or the motor shaft, of the first sealing piece is abutted to the shell, and at least one of the motor shaft and the speed reducer input shaft, the shell and the first sealing piece enclose to form the lubrication cavity.

3. The power plant according to claim 2, characterized in that:

The first sealing element comprises an outer peripheral surface facing away from the input shaft of the speed reducer and a first surface facing towards the motor, wherein the outer peripheral surface is connected with the first surface to form an included angle, and the first surface and the outer peripheral surface are attached to the inner wall of the shell.

4. The power plant according to claim 2, characterized in that:

the casing comprises a first curved surface, the motor shaft comprises a second curved surface, the first curved surface and the second curved surface are matched, a gap is formed, and the gap is communicated with the lubricating cavity.

5. The power plant according to claim 2, characterized in that:

the motor shaft comprises a third straight surface and a fourth straight surface which are connected and form an included angle; the first straight surface and the third straight surface are opposite to each other at intervals, and the second straight surface and the fourth straight surface are opposite to each other at intervals so as to form a gap, and the gap is communicated with the lubrication cavity.

6. The power plant according to claim 5, characterized in that:

the casing includes two first archs that radially separate at the reduction gear input shaft, two form first mating groove between the first arch, the motor shaft includes two second archs that radially separate at it, two form the second mating groove between the second arch, one of them first protruding holding in the second mating groove, one of them second protruding holding in the first mating groove, first protruding with between the motor shaft and between the second arch and the casing all have the clearance, first straight face with the second straight face is first bellied surface or first mating groove's bottom surface, third straight face with the fourth straight face is second bellied surface or second mating groove's bottom surface.

7. The power plant according to claim 6, characterized in that:

the distance between the adjacent first bulge and the second bulge in the radial direction of the motor shaft is 0.15mm-0.25mm.

8. The power plant according to claim 2, characterized in that:

the motor shaft is provided with an axially extending mounting hole, the mounting hole is communicated with the lubrication cavity, and one end of the input shaft of the speed reducer extends into the mounting hole and is fixedly connected with the motor shaft through a key.

9. The power plant of claim 8, wherein:

the power device further comprises a sealing plug, wherein the sealing plug is plugged in the mounting hole and is opposite to the input shaft of the speed reducer at intervals.

10. The power plant according to claim 9, characterized in that:

the inner wall of the mounting hole is sunken to form a limiting boss, the sealing plug comprises a limiting lug, and the limiting lug is in butt joint with the limiting boss so as to limit the sealing plug to move away from the input shaft of the speed reducer.

11. The power plant according to claim 1, characterized in that:

the motor comprises a stator and a rotor, the stator is fixed in the shell, and the rotor is fixed on the rotating shaft; the casing is provided with a circulating water channel, the circulating water channel is used for circulating and flowing a cooling medium, the stator is thermally coupled with the casing, and the cooling medium is thermally coupled with the casing.

12. The power plant according to claim 1, characterized in that:

the power device further comprises a second sealing piece, the second sealing piece is located between the motor and the lubricating cavity, and the second sealing piece is sleeved on the rotating shaft and is abutted to the machine shell.

13. An electric propulsion device, characterized by comprising a controller, a propeller and a power unit according to any one of claims 1-12, wherein the controller is electrically connected to the power unit, the speed reducer comprises a speed reducer output shaft, and the propeller is fixedly connected to the speed reducer output shaft.

14. A water mobile device comprising an electric propulsion apparatus according to claim 13.