CN220421536U - End cover assembly and motor - Google Patents

Abstract

The embodiment of the application provides an end cover assembly and a motor, wherein the end cover assembly comprises a main body, the main body comprises an end face part and an inner ring part which is arranged around the inner edge of the end face part, and the inner ring part surrounds a bearing cavity with an open bottom; the end face part comprises a first interlayer and a second interlayer arranged at the top of the first interlayer, and a cavity is formed between the first interlayer and the second interlayer. The embodiment of the application also provides a motor, and the end cover assembly and the motor of the embodiment of the application can reduce weight and meet the design requirement of light weight.

Description

End cover assembly and motor

Technical Field

The application relates to the technical field of motors, in particular to an end cover assembly and a motor.

Background

In the field of rail transit, the weight requirement on the mobile carrier equipment is higher, and the lighter the weight, the lower the energy consumption of the motor. At present, the main body structure of the common motor end cover is heavy, the structure is limited by the use requirement and is difficult to shrink, and the main body structure of the end cover is redundant in design and waste of materials, so that the weight of the motor whole machine is difficult to meet the design requirement of light weight.

Disclosure of Invention

In view of the foregoing, it is desirable to provide an end cover assembly and a motor that can reduce weight and meet the design requirements for light weight.

In order to achieve the above objective, an embodiment of the present application provides an end cap assembly, which includes a main body, wherein the main body includes an end face portion and an inner ring portion disposed around an inner edge of the end face portion, and the inner ring portion encloses a bearing cavity with an open bottom;

the end face part comprises a first interlayer and a second interlayer arranged at the top of the first interlayer, and a cavity is formed between the first interlayer and the second interlayer.

In some embodiments, the inner edges of the first and second interlayers are connected to the inner ring portion, and the outer edges of the second interlayer are connected to the first interlayer, such that the first interlayer, the second interlayer, and the inner ring portion enclose the cavity.

In some embodiments, the first interlayer is provided with at least one first air inlet communicated with the cavity and at least one air outlet communicated with the cavity.

In some embodiments, the main body includes an outer ring portion disposed around an outer edge of the end surface portion, a second air inlet is formed in the outer ring portion, the first interlayer has a bending portion facing the second air inlet, and the first air inlet is disposed in the bending portion.

In some embodiments, the inner ring portion includes a honeycomb inner layer and a cover wrapped over the honeycomb inner layer.

In some embodiments, the end cap assembly includes a seal disposed at a bottom opening of the bearing cavity;

the sealing element is provided with a plurality of sealing ring grooves which encircle the central shaft of the bearing cavity, the sealing ring grooves are sequentially arranged along the radial direction of the main body, and the opening of each sealing ring groove faces to one side of the sealing element, which faces away from the main body.

In some embodiments, a sinking platform is arranged at the juncture of the bottom end surface of the inner ring part and the inner ring surface, and the sealing piece is abutted against the bottom wall and the side wall of the sinking platform; the side wall of the sinking table is provided with a clamping groove, the circumferential side wall of the sealing piece is provided with a convex clamping protrusion, and the clamping protrusion is inserted into the clamping groove.

In some embodiments, the seal is formed separately from the body.

In some embodiments, the material of the seal is a polyetherketone resin composite.

The embodiment of the application also provides a motor, which comprises an end cover assembly, a stator assembly and a rotor assembly, wherein the rotor assembly can be rotationally arranged in the stator assembly, and the end cover assembly is arranged on the end part of the stator assembly.

In some embodiments, the end cap assembly includes a seal member disposed at the bottom opening of the bearing cavity, the seal member defining a plurality of seal ring grooves thereon around a central axis of the bearing cavity, each of the seal ring grooves being arranged in sequence along a radial direction of the body, and an opening of each of the seal ring grooves facing a side of the seal member facing away from the body;

the motor comprises a second sealing piece, the second sealing piece is arranged on the side wall of the rotating shaft of the rotor assembly, the second sealing piece comprises a plurality of insert ring bodies and connecting parts connected with one ends of the insert ring bodies, and one ends of the insert ring bodies, which are far away from the connecting parts, are respectively inserted into the sealing ring grooves so as to be in sealing connection with the end cover assembly and the rotor assembly.

The end cover assembly and the motor provided by the embodiment of the application, the end face part of the end cover assembly comprises a first interlayer and a second interlayer arranged at the top of the first interlayer, a cavity is formed between the first interlayer and the second interlayer, that is to say, the end cover assembly has a sandwich structure with the cavity, so that the weight of the end face part can be reduced while the strength is met, and the requirement of light weight is met.

Drawings

FIG. 1 is a schematic illustration of an end cap assembly according to an embodiment of the present application;

FIG. 2 is a partial cross-sectional view of an electric motor according to an embodiment of the present application;

FIG. 3 is a schematic flow diagram of a cooling medium of the motor of FIG. 2;

FIG. 4 is an enlarged schematic view of a portion A of the motor of FIG. 3;

FIG. 5 is an enlarged schematic view of a portion B of the motor shown in FIG. 3;

FIG. 6 is a schematic diagram illustrating the assembly of a seal and a second seal of an electric machine according to an embodiment of the present disclosure;

fig. 7 is an enlarged schematic view of a portion C of the motor shown in fig. 6.

Description of the reference numerals

An end cap assembly 10; a main body 11; an end face portion 111; a first interlayer 1111; a first air inlet 11111; an air outlet 11112; a bent portion 11113; a second interlayer 1112; cavity 1113;

an inner ring portion 112; a honeycomb inner layer 1121; a cover 1122; a sink 1123; a clamping groove 1124;

a bearing cavity 113; an outer ring portion 114;

a seal 12; a seal ring groove 121; a card protrusion 122;

a bearing 20;

a stator assembly 30;

a rotor assembly 40;

a second seal 50; an insert ring body 51; a connecting portion 52; and a second seal ring groove 53.

Detailed Description

Embodiments of the present application are described in further detail below with reference to the accompanying drawings and examples. The following examples are illustrative of the present application but are not intended to limit the scope of the present application.

In the description of the embodiments of the present application, it should be noted that the terms "top," "bottom," and the like indicate an orientation or a positional relationship based on the orientation or the positional relationship shown in fig. 2 and 3, and are merely for convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Referring to fig. 1, an embodiment of the present application provides an end cap assembly for use in an electric motor.

Referring to fig. 2, an embodiment of the present application further provides an electric machine including an end cap assembly 10, a bearing 20, a stator assembly 30, and a rotor assembly 40. The rotor assembly 40 is rotatably disposed within the stator assembly 30 and the end cap assembly 10 is disposed on an end of the stator assembly 30.

The end cap assembly 10 includes a body 11, the body 11 being the primary force-receiving component of the end cap assembly 10.

The main body 11 includes an end face portion 111 and an inner ring portion 112 provided around an inner edge of the end face portion 111, the inner ring portion 112 enclosing a bearing cavity 113 having an open bottom. It will be appreciated that bearing cavity 113 is used to mount bearing 20 and that an opening is provided for the shaft of rotor assembly 40 to extend into to connect with bearing 20. It should be noted that, referring to fig. 1 and 2, the bottom is the end cap assembly 10 facing the stator direction, and the top is the end cap assembly 10 facing away from the stator direction. That is, the side of the bearing cavity 113 facing the stator is open.

The end surface 111 includes a first interlayer 1111 and a second interlayer 1112 disposed on top of the first interlayer 1111, and a cavity 1113 is formed between the first interlayer 1111 and the second interlayer 1112. The sandwich structure having the cavity 1113 can satisfy strength while reducing the weight of the end face portion 111.

It is understood that the inner edge of the second interlayer 1112 may be connected to the inner ring portion 112 or to the first interlayer 1111. In some embodiments, the inner edges of the first and second interlayers 1111, 1112 are connected to the inner ring portion 112, and the outer edges of the second interlayer 1112 are connected to the first interlayer 1111, such that the first interlayer 1111, the second interlayer 1112, and the inner ring portion 112 enclose the cavity 1113. In this manner, the cavities 1113 are distributed adjacent to the inner ring portion 112 and axial support is provided by the inner ring portion 112 to meet the strength requirements thereof.

In some embodiments, referring to fig. 1 and 4, the first interlayer 1111 is provided with at least one first air inlet 11111 communicating with the cavity 1113 and at least one air outlet 11112 communicating with the cavity 1113. In this way, the cooling medium, such as air, can flow into the cavity 1113 from the first air inlet 11111 and flow out from the air outlet 11112, and the cooling medium flowing out of the air outlet 11112 can dissipate heat and cool the interior of the motor. In addition, the cavity 1113 is surrounded by the first interlayer 1111, the second interlayer 1112 and the inner ring 112, and the inner ring 112 surrounds the bearing cavity 113 with an open bottom, so that the cooling medium flows through the cavity 1113, and the bearing cavity 113 can be cooled.

In some embodiments, referring to fig. 1, the number of the first air inlets 11111 and the number of the air outlets 11112 are plural, so as to increase the air inlet area and the air outlet area of the cavity 1113, and reduce the weight of the end cover assembly 10.

Referring to fig. 3 and 4, each air outlet 11112 is disposed around the bearing cavity 113, and the cooling medium flowing out of the air outlet 11112 can enter the heat dissipation channel of the rotor assembly 40, thereby cooling the rotor assembly 40. Each first air inlet 11111 is disposed around the bearing cavity 113 and radially outside each air outlet 11112, so as to facilitate inflow of the cooling medium.

In some embodiments, referring to fig. 3, the main body 11 includes an outer ring 114 disposed around an outer edge of the end surface 111, and the outer ring 114 is configured to abut against the stator assembly 30 or the housing. The outer ring portion 114 is provided with a second air inlet (not shown in fig. 3 for reasons of cross-section). It will be appreciated that the cooling medium flows from the second inlet opening into the space enclosed by the outer ring portion 114 and the end face portion 111.

Referring to fig. 4, the first interlayer 1111 has a bending portion 11113 facing the second air inlet, and the first air inlet 11111 is disposed on the bending portion 11113, so that the cooling medium flowing out of the second air inlet can directly flow into the first air inlet 11111, so as to avoid the heat dissipation effect of the bearing cavity 113 and the rotor assembly 40 due to the long residence time and the increased temperature of the cooling medium in the space of the end cover assembly.

In some embodiments, referring to fig. 5, inner ring portion 112 includes a honeycomb inner layer 1121 and an envelope 1122 surrounding honeycomb inner layer 1121. Thereby reducing the weight of the inner ring portion 112 and thus the weight of the segment end cap assembly 10. In this embodiment, honeycomb inner layer 1121 and cover 1122 are made using additive methods.

The honeycomb inner layer 1121 is annular in shape, and has a plurality of polygonal voids therein, and the length of the voids extends in the axial direction of the end cap assembly 10.

Referring to fig. 1 and 3, the end cap assembly 10 includes a seal member 12. The seal 12 is disposed at the bottom opening of the bearing cavity 113. It will be appreciated that the seal member 12 is generally annular in shape and is disposed at an open position at the bottom of the bearing cavity 113 for sealingly connecting the spindle to the end cap assembly 10.

Referring to fig. 5, the sealing member 12 defines a plurality of sealing ring grooves 121 around a central axis of the bearing cavity 113, and each sealing ring groove 121 is sequentially arranged along a radial direction of the main body 11. That is, the body 11 has a plurality of seal ring grooves 121 from inside to outside in a radial direction, and each seal ring groove 121 is disposed coaxially with the rotation shaft of the rental assembly 40.

Each seal ring groove 121 opens toward the side of the seal 12 facing away from the main body 11. It will be appreciated that the seal 12 is located between the end cap assembly 10 and the rotor assembly 40 after installation, where the gap between the stationary end cap assembly 10 and the rotating rotor assembly 40 is located at the seal ring groove 121, and that lubrication oil leaks from the gap, the oil leak path length is greatly extended by providing a plurality of seal ring grooves 121.

It will be appreciated that referring to fig. 5, the number of seal ring grooves 121 is not limited and may be matched to the sealing requirements. In some embodiments, the number of seal ring grooves 121 is two. I.e. the number of sealing ring grooves 121 between three radially spaced barrier walls is two.

In some embodiments, referring to fig. 6 and 7, the motor includes a second sealing member 50, where the second sealing member 50 is disposed on a side wall of a rotating shaft of the rotor assembly 40, and includes a plurality of insert ring bodies 51 and a connecting portion 52 connected to one end of each insert ring body 51, and the connecting portion 52 is connected to the rotating shaft of the rotating assembly. Each insert ring 51 coaxially surrounds the rotation shaft. Wherein, the adjacent insert ring body 51 and the connecting portion 52 enclose a second seal ring groove 53.

One end of each insert ring body 51, which is far away from the connecting portion 52, is inserted into each seal ring groove 121 to seal and connect the end cover assembly 10 and the rotor assembly 40. Correspondingly, the wall between the seal ring grooves 121 of the seal 12 is also inserted into the second seal ring groove 53.

In this embodiment, the end cap assembly 10 is functionally separated into the main body 11 and the seal member 12, such that the seal member 12 encloses a plurality of seal ring grooves 121. The rotatable sealing connection of the end cap assembly 10 and the rotary shaft of the rotor assembly 40 is achieved by the insertion of the insert ring body 51 of the second seal member 50 into the seal ring groove 121 of the seal member 12. Since the path of the oil leakage is the gap between the seal ring groove 121 and the insert ring body 51, the arrangement of the plurality of seal ring grooves 121 greatly prolongs the path length. This makes it possible to reduce the size and weight of the seal 12 and to achieve the light weight requirements while satisfying the tightness required by the design.

It will be appreciated that the thickness of the insert ring body 51 is substantially the same as the width of the seal ring groove 121, so as to ensure the tightness of the insert ring body 51 after being connected to the seal ring groove 121.

To reduce manufacturing costs, in some embodiments, the second seal 50 is identical in construction to the seal 12 to enable interchangeable versatility.

Illustratively, the body 11 and the seal 12 are formed separately. It will be appreciated that the end cap assembly 10 is a combination of a molded body 11 and a molded seal member 12. In this way, the seal 12 and the main body 11 having relatively complex and light molding structures can be easily molded, and a lightweight design can be advantageously realized.

It should be understood that the connection between the main body 11 and the sealing member 12 is not limited, and at least one of snap-fit assembly, adhesion, and die-casting may be used, and it should be noted that the connection is selected by considering the elastic modulus and the thermal expansion coefficient of different materials.

It is understood that the molding manner of the main body 11 is not limited, and may be, for example, die casting molding or machining molding. In some embodiments, the body 11 is molded using additive manufacturing, such as 3D printing, to facilitate molding of relatively complex and hollow structures, such as honeycomb structures.

It will be appreciated that the material of the seal 12 is not limited. In some embodiments, the material of the seal 12 is a polyetherketone resin composite, and injection molding, extrusion molding, compression molding, or blow molding is used. It can be appreciated that, since the polyether ketone resin composite material has a strong strength, better stability and reliability can be maintained when the wall thickness between the adjacent seal ring grooves 121 is small, so that the width of the seal ring grooves 121 and the wall thickness between the adjacent seal ring grooves 121 can be reduced, thereby facilitating weight reduction.

In some embodiments, referring to fig. 5, a sinking platform 1123 is disposed at the junction between the bottom end surface of the inner ring 112 and the inner ring surface, and a clamping groove 1124 is disposed on the sidewall of the sinking platform 1123. The clamping groove 1124 may be an annular clamping groove surrounding the sinking platform 1123, or may be formed by a plurality of small clamping grooves arranged at intervals surrounding the sinking platform 1123.

The circumferential side wall of the seal 12 has a raised catch 122 which, when installed, causes the seal 12 to abut against the bottom and side walls of the sink deck 1123 to effect axial and radial positioning of the seal 12. The locking protrusion 122 is inserted into the locking groove 1124 to connect the body 11 and the sealing member 12 in a locking manner. The latch 122 may be an annular latch groove around the circumferential side wall of the seal 12, or may be a plurality of small latch projections spaced around the circumferential side wall of the seal 12. It will be appreciated that when the snap 122 is formed from a polyether ketone resin composite material with the seal 12, the snap 122 comprises a plurality of small snap tabs spaced around the circumferential side wall of the seal 12 due to the higher strength thereof in order to reduce the resistance to installation. During installation, the small clamp bulge is extruded by the side wall of the sinking table 1123 and then deforms, and after moving to the position in the small clamp groove, the deformation is recovered and clamped in the small clamp groove.

It will be appreciated that glue may be provided between the counter 1123 and the inner ring portion 112 to further secure and seal.

In this embodiment, the shaft of the rotor assembly 40, the bearing 20, the body 11 and the second seal 50 enclose a bearing reservoir.

In the description of the present application, reference to the terms "one embodiment," "some embodiments," "exemplary," and the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the present application. In this application, the schematic representations of the above terms are not necessarily for the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the various embodiments or examples described herein, as well as the features of the various embodiments or examples, may be combined by those skilled in the art without contradiction.

The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations can be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims (11)

1. The end cover assembly is characterized by comprising a main body, wherein the main body comprises an end face part and an inner ring part which is arranged around the inner edge of the end face part, and the inner ring part surrounds a bearing cavity with an open bottom;

the end face part comprises a first interlayer and a second interlayer arranged at the top of the first interlayer, and a cavity is formed between the first interlayer and the second interlayer.

2. The end cap assembly of claim 1, wherein the inner edges of the first and second interlayers connect the inner ring portion and the outer edges of the second interlayer connect the first interlayer such that the first, second and inner ring portions enclose the cavity.

3. The end cap assembly of claim 1, wherein said first interlayer defines at least one first air inlet opening in communication with said cavity and at least one air outlet opening in communication with said cavity.

4. An end cap assembly according to claim 3, wherein the body includes an outer ring portion disposed around an outer edge of the end face portion, the outer ring portion having a second air inlet opening therein, the first interlayer having a bend portion facing the second air inlet opening, the first air inlet opening being disposed in the bend portion.

5. The end cap assembly of claim 1, wherein said inner ring portion comprises a honeycomb inner layer and a cover surrounding said honeycomb inner layer.

6. The end cap assembly of any one of claims 1-5, wherein the end cap assembly includes a seal disposed at a bottom opening of the bearing cavity;

the sealing element is provided with a plurality of sealing ring grooves which encircle the central shaft of the bearing cavity, the sealing ring grooves are sequentially arranged along the radial direction of the main body, and the opening of each sealing ring groove faces to one side of the sealing element, which faces away from the main body.

7. The end cap assembly of claim 6, wherein a countersink is provided at the juncture of the bottom end surface of the inner ring portion and the inner ring surface, and the seal member abuts against the bottom wall and the side wall of the countersink;

the side wall of the sinking table is provided with a clamping groove, the circumferential side wall of the sealing piece is provided with a convex clamping protrusion, and the clamping protrusion is inserted into the clamping groove.

8. The end cap assembly of claim 6, wherein said seal member is molded separately from said body.

9. The end cap assembly of claim 6, wherein the material of the seal member is a polyetherketone resin composite.

10. An electric machine comprising an end cap assembly according to any one of claims 1 to 9, a stator assembly and a rotor assembly, the rotor assembly being rotatably disposed within the stator assembly, the end cap assembly being disposed on an end of the stator assembly.

11. The motor of claim 10, wherein the end cap assembly includes a seal member disposed at the bottom opening of the bearing cavity, the seal member defining a plurality of seal ring grooves around a central axis of the bearing cavity, each of the seal ring grooves being arranged in sequence along a radial direction of the body with an opening of each of the seal ring grooves facing away from the body;

the motor comprises a second sealing piece, the second sealing piece is arranged on the side wall of the rotating shaft of the rotor assembly, the second sealing piece comprises a plurality of insert ring bodies and connecting parts connected with one ends of the insert ring bodies, and one ends of the insert ring bodies, which are far away from the connecting parts, are respectively inserted into the sealing ring grooves so as to be in sealing connection with the end cover assembly and the rotor assembly.