End cover assembly and motor

Abstract

The invention provides an end cover assembly and a motor, the end cover assembly comprises an end cover, the end cover is provided with a shaft hole, the surface, facing the interior of the motor, of the end cover is provided with an annular boss surrounding the shaft hole, the annular boss is provided with an inner cavity communicated with the shaft hole, the inner cavity is provided with a bearing chamber, and the bearing chamber is provided with a bearing. The end cover assembly further comprises a gland, the gland is in threaded connection with the annular boss, and the gland comprises an annular extrusion part which is used for extruding the outer ring of the bearing and surrounds the shaft hole, so that the firmness degree of axial limiting of the outer ring of the bearing can be improved while the sealing performance of the end cover is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of motors, and in particular relates to an end cover assembly and a motor. Background Art

[0002] When designing or installing the bearings of new energy drive motors, their axial and radial displacements need to be limited to ensure the stability and accuracy of the motor during operation. This full-limit design is crucial to improving the efficiency of the motor, reducing vibration and noise, extending the life of the bearing, and ensuring the overall reliability of the motor system. The bearing is installed in the bearing chamber of the end cover. In the prior art, the outer ring of the bearing is axially limited by the end face of the bearing chamber and the inner pressure cover of the bearing; the inner ring of the bearing is limited by the rotor shaft and the shaft retaining ring. When the inner pressure cover of the bearing is used, the pressure cover is locked on the end cover by bolts passing through the end cover from the outside. The bolt connection motor has multiple failure points, that is, when the bolts lock the pressure cover, the sealing effect between the bolts and the end cover is poor; in order to improve the sealing of the end cover, the prior art uses a hole retaining ring to axially limit the bearing, but due to the structural strength problem of the hole retaining ring itself, the axial limit of the bearing is not firm enough.

[0003] How to ensure the sealing performance of the end cover while improving the firmness of the axial limit of the outer ring of the bearing is a technical problem that urgently needs to be solved. Summary of the invention

[0004] Therefore, the present invention provides an end cover assembly and a motor, which can ensure the sealing performance of the end cover while improving the firmness of the axial limitation of the outer ring of the bearing.

[0005] On the one hand, the present invention provides an end cover assembly for a motor, the end cover assembly comprising an end cover, the end cover being provided with an axial hole, the surface of the end cover facing the interior of the motor being provided with an annular boss surrounding the axial hole, the annular boss being provided with an inner cavity connected to the axial hole, the inner cavity being provided with a bearing chamber, the end cover assembly further comprising a pressure cover, the pressure cover being threadedly connected to the annular boss, the pressure cover comprising an annular extrusion portion for extruding the outer ring of the bearing and surrounding the axial hole.

[0006] In some embodiments, the end cover assembly also includes a first elastic gasket, which is arranged between the annular boss and the pressure cover. In the circumferential direction of the axial hole, the annular boss circumferentially limits the first elastic gasket, and the first elastic gasket circumferentially limits the pressure cover.

[0007] In some embodiments, the outer circumferential surface of the annular boss is provided with an annular step, and the annular step includes a first outer circumferential surface facing away from the axial hole and a first annular surface facing the pressure cover, and the first elastic gasket is sleeved on the first outer circumferential surface and squeezed between the first annular surface and the pressure cover.

[0008] In some embodiments, a first clamping portion is disposed on the first outer circumferential surface, a second clamping portion is disposed on the inner circumferential surface of the first elastic gasket, and the second clamping portion is clamped together with the first clamping portion.

[0009] In some embodiments, the outer ring of the first elastic gasket is provided with a stop protrusion, the outer peripheral surface of the pressure cover is the second outer peripheral surface, and the second outer peripheral surface is provided with a stop rotation groove. When the pressure cover is set on the annular boss, the stop rotation protrusion is bent toward the pressure cover and can be inserted into the stop rotation groove.

[0010] In some embodiments, there are multiple and evenly distributed anti-rotation protrusions, there are multiple and evenly distributed anti-rotation grooves, and the number of the anti-rotation protrusions is different from the number of the anti-rotation grooves; in the axial direction, the projections of the multiple anti-rotation protrusions at least partially overlap with the projections of the multiple anti-rotation grooves.

[0011] In some embodiments, the inner wall surface of the inner cavity includes an internal thread structure, the pressure cover includes a connecting portion extending into the inner cavity, and the connecting portion includes an external thread structure adapted to the internal thread structure; the bearing chamber includes a mounting surface covering the outer cylindrical surface of the outer ring of the bearing, and the diameter of the internal thread structure is larger than the diameter of the mounting surface.

[0012] In some embodiments, the internal thread structure is connected to the mounting surface via a transition surface, and the transition surface includes a conical surface, and the small end of the conical surface is connected to the mounting surface.

[0013] In some embodiments, in the axial direction of the axial hole, the annular boss includes a table surface facing the pressure cover, and the pressure cover includes a second annular surface opposite to the table surface, and a protruding structure is arranged on the second annular surface, and when the connecting portion squeezes the outer ring of the bearing, the protruding structure squeezes the second annular surface and deforms.

[0014] In some embodiments, the connecting portion includes a pressing portion for pressing the outer ring of the bearing, and a second elastic gasket is arranged between the pressing portion and the outer ring of the bearing.

[0015] The present invention also provides a motor, comprising a rotating shaft, a bearing and the end cover assembly; the bearing is arranged in the bearing chamber, a rotor core is arranged on the rotating shaft, one end of the rotating shaft is passed through the bearing, and the distance between the rotor core and the annular boss is less than a preset distance L.

[0016] The present invention arranges a pressure cover on the inner side of the end cover, and the pressure cover and the end cover are threadedly connected. The pressure cover extends into the inner cavity to extrude the bearing, and the extrusion surface is an annular surface, thereby improving the stability and firmness of the axial limitation of the bearing. Since the bolts in the prior art are eliminated, the sealing performance of the end cover is also improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. The drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0018] Figure 1 is a schematic diagram of the motor structure when a gland is provided in an embodiment of the present invention;

[0019] Figure 2 The embodiment of the present invention Figure 1 Enlarged view of point A in the middle;

[0020] Figure 3 is a schematic diagram of the end cover structure of an embodiment of the present invention;

[0021] Figure 4 is a schematic structural diagram of a first elastic gasket according to an embodiment of the present invention;

[0022] Figure 5 is a schematic diagram of the gland structure of an embodiment of the present invention;

[0023] Figure 6 is a schematic diagram of a gland structure when a protruding structure is provided in an embodiment of the present invention;

[0024] Figure 7 is a schematic diagram of the relative positions of the first elastic gasket and the gland from an axial perspective of an embodiment of the present invention;

[0025] Figure 8 This is a schematic diagram of a motor provided with a retaining ring in the prior art;

[0026] Fig. 9 It is a schematic diagram of a motor provided with bolts in the prior art;

[0027] The accompanying drawings are marked as follows:

[0028] 1. End cover; 101. Annular boss; 102. Shaft hole; 103. Bearing chamber; 104. Through hole; 105. Anti-rotation groove; 106. External thread structure; 107. Protrusion structure; 108. Table; 1031. Mounting surface; 2. Pressure cover; 301. Outer ring; 302. Inner ring; 4. Annular surface; 501. First elastic gasket; 502. Second elastic gasket; 5011. Anti-rotation protrusion; 601. First outer peripheral surface; 602. Second outer peripheral surface; 701. Internal thread structure; 702. Conical surface; 703. Rotating shaft; 704. Rotor core; 801. Retaining ring; 802. Bolt; 901. First annular surface; 902. Second annular surface. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0031] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0032] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0033] The present invention provides an end cover assembly and a motor, which can ensure the sealing performance of the end cover and improve the firmness of the axial limit of the outer ring of the bearing.

[0034] See also Figure 1-7 As shown, the present invention provides an end cover assembly for a motor, the end cover assembly includes an end cover 1, the end cover 1 is provided with an axial hole 102, the surface of the end cover 1 facing the interior of the motor is provided with an annular boss 101 surrounding the axial hole 102, the annular boss 101 is provided with an inner cavity connected to the axial hole 102, the inner cavity is provided with a bearing chamber 103, the end cover assembly also includes a pressure cover 2, the pressure cover 2 is threadedly connected to the annular boss 101, and the pressure cover 2 includes an annular extrusion portion surrounding the axial hole 102 and used for extruding the outer ring 301 of the bearing.

[0035] The present application provides a gland 2 on the annular boss 101, the gland 2 is threadedly connected to the annular boss 101, and includes an annular extrusion portion for extruding the outer ring 301 of the bearing and surrounding the shaft hole 102. When the bearing chamber 103 is provided with a bearing, the gland 2 can extrude the outer ring 301 of the bearing, and the extrusion area between the gland 2 and the outer ring 301 of the bearing is an annular surface 4. Figure 8As shown in the figure, the bearing is axially limited by a retaining ring 801, and a caliper is required when installing the retaining ring 801. On the one hand, the structural strength of the retaining ring 801 is insufficient, and the axial limitation of the bearing is also insufficient. On the other hand, the use of a caliper requires a larger operating space, resulting in a larger axial direction of the motor. The present application uses a pressure cover 2 and an annular boss 101 to threadedly connect the bearing axially. The threaded connection is more secure, which improves the firmness of the bearing limitation. Since the retaining ring 801 is not used, a caliper is not required during installation, which is beneficial to shortening the axial length of the motor. Prior art (such as Fig. 9 As shown in the figure, the gland 2 is fixed on the annular boss 101 by passing the bolt 802 through the end cover 1. The bolt 802 and the hole on the gland 2 are easy to be misaligned, the assembly efficiency is low, and the assembly process is complicated; and multiple bolts 802 locking the gland 2 will also cause uneven force on the gland 2. The closer to the bolt 802, the greater the clamping force, and the farther away from the bolt 802, the smaller the clamping force, which in turn causes uneven force on the outer ring 301 of the bearing, making the bearing prone to noise, aggravating local wear, and reducing the service life of the bearing; because the bolt 802 needs to pass through the end cover 1 to lock the gland 2 located inside the motor, this reduces the protection performance of the motor; especially for new energy motors, the protection level requirements are high, generally above IP67, and the hole set on the end cover 1 through the bolt 802 will reduce the protection performance of the end cover 1 to the motor. The gland 2 of the present application is connected to the annular boss 101 through a threaded connection, so that the connection part surrounds the annular boss 101, and the extrusion force generated between the gland 2 and the bearing outer ring 301 can be evenly distributed along the annular surface 4, further improving the firmness of the bearing limit. Since there is no hole on the end cover 1 for passing the bolt 802 to lock the gland 2, the sealing performance is improved. In the present application, "axial" refers to the axial direction of the shaft hole 102 with reference to the shaft hole 102; "circumferential" also refers to the circumferential direction of the shaft hole 102 with reference to the shaft hole 102; "radial" refers to the radial direction of the shaft hole 102 with reference to the shaft hole 102.

[0036] The gland 2 has a through hole 104 passing through the rotating shaft 703 , and the diameter of the through hole 104 is larger than the outer diameter of the inner ring 302 of the bearing.

[0037] Preferably, Figure 1 and Figure 2 As shown, the end cover assembly also includes a first elastic gasket 501, which is arranged between the annular boss 101 and the pressure cover 2. In the circumferential direction of the axial hole 102, the annular boss 101 circumferentially limits the first elastic gasket 501, and the first elastic gasket 501 circumferentially limits the pressure cover 2.

[0038] After being squeezed, the first elastic gasket 501 can generate a force on the gland 2 along the axial direction of the shaft hole 102, which can improve the firmness of the threaded connection between the gland 2 and the annular boss 101, and prevent the gland 2 from falling off due to motor vibration. There is a circumferential limit between the first elastic gasket 501 and the annular boss 101, and there is also a circumferential limit between the first elastic gasket 501 and the gland 2, so that in the circumferential direction, the gland 2 will not rotate relative to the annular boss 101, further improving the firmness of the gland 2 fixed on the annular boss 101, and correspondingly improving the firmness of the bearing installation, and also preventing the gland 2 from loosening and causing the bearing to be unable to be limited in the bearing chamber 103, thereby also avoiding the noise generated thereby.

[0039] Preferably, Figure 2 and Figure 3 As shown, the outer circumferential surface of the annular boss 101 is provided with an annular step, and the annular step includes a first outer circumferential surface 601 facing away from the axial hole 102 and a first annular surface 901 facing the pressure cover 2, and the first elastic gasket 501 is sleeved on the first outer circumferential surface 601 and squeezed between the first annular surface 901 and the pressure cover 2.

[0040] By setting an annular step on the annular boss 101, the first elastic gasket 501 is sleeved on the first outer peripheral surface 601, and the first outer peripheral surface 601 has a supporting and positioning function for the first elastic gasket 501, that is, it has a radial limiting function for the first elastic gasket 501; after the first elastic gasket 501 is radially limited, the first elastic gasket 501 can be evenly squeezed by the pressure cover 2 and the annular boss 101 in the circumferential direction, that is, the first elastic gasket 501 generates a uniform elastic force on the pressure cover 2 in the circumferential direction, so that the pressure cover 2 can be more firmly threaded with the annular boss 101.

[0041] Preferably, Figure 3 and Figure 4 As shown, the first outer peripheral surface 601 is provided with a first clamping portion, and the inner peripheral surface of the first elastic gasket 501 is provided with a second clamping portion, and the second clamping portion is clamped together with the first clamping portion.

[0042] The first elastic gasket 501 is clamped with the annular boss 101 to limit the circumferential position of the first elastic gasket 501 , thereby improving the stability of the circumferential positioning of the first elastic gasket 501 .

[0043] Specifically, a groove is provided on the first outer peripheral surface 601 , and a protrusion is provided on the inner ring 302 of the first elastic gasket 501 . The protrusion is inserted into the groove to achieve the limitation between the first elastic gasket 501 and the annular boss 101 in the circumferential direction.

[0044] Preferably, Figure 4 and Figure 5 As shown, the outer ring 301 of the first elastic gasket 501 is provided with a stop protrusion 5011, the outer peripheral surface of the pressure cover 2 is the second outer peripheral surface 602, and the second outer peripheral surface 602 is provided with a stop groove 105. When the pressure cover 2 is set on the annular boss 101, the stop protrusion 5011 is bent toward the pressure cover 2 and can be inserted into the stop groove 105.

[0045] “The anti-rotation protrusion 5011 is bent toward the pressure cover 2 and can be inserted into the anti-rotation groove 105 ” includes that a part of the anti-rotation protrusion 5011 is inserted into the anti-rotation groove 105 .

[0046] By providing a rotation-stopping protrusion 5011 on the outer ring 301 of the first elastic gasket 501 and providing a rotation-stopping groove 105 on the outer peripheral surface of the gland 2, when the gland 2 is arranged on the annular boss 101 to produce a squeezing effect on the bearing, the rotation-stopping protrusion 5011 bends toward the gland 2 and snaps into the rotation-stopping groove 105, thereby limiting the gland 2 in the circumferential direction and preventing the gland 2 from rotating circumferentially relative to the first elastic gasket 501. The rotation-stopping protrusion 5011 is snapped into the rotation-stopping groove 105 to limit the gland 2 in the circumferential direction, thereby improving the firmness of the circumferential limit of the gland 2.

[0047] Preferably, Figure 7 As shown, there are multiple and evenly distributed anti-rotation protrusions 5011, and there are multiple and evenly distributed anti-rotation grooves 105. The number of the anti-rotation protrusions 5011 is different from the number of the anti-rotation grooves 105. In the axial direction, the projections of the multiple anti-rotation protrusions 5011 at least partially overlap with the projections of the multiple anti-rotation grooves 105.

[0048] Since the anti-rotation grooves 105 and the anti-rotation protrusions 5011 are multiple and different in number, and the projections of the multiple protrusions at least partially overlap with the projections of the multiple grooves, when the gland 2 rotates to any position, the anti-rotation protrusions 5011 bend toward the gland 2, and at least one part of the anti-rotation protrusions 5011 is inserted into the anti-rotation grooves 105, so that the axial position of the gland 2 can be limited. For example, the number of anti-rotation grooves 105 is 20, and the angle between two adjacent grooves is 18°; the number of anti-rotation protrusions 5011 is set to 19, and the circumferential size of the anti-rotation protrusions 5011 is slightly smaller than the size of the anti-rotation grooves 105. No matter how the gland 2 rotates, a part or all of at least one anti-rotation protrusion 5011 can be inserted into the anti-rotation groove 105.

[0049] Preferably, Figure 1As shown, the inner wall surface of the inner cavity includes an internal thread structure 701, the pressure cover 2 includes a connecting portion extending into the inner cavity, and the connecting portion includes an external thread structure 106 adapted to the internal thread structure 701; the bearing chamber 103 includes a mounting surface 1031 covering the outer cylindrical surface of the outer ring 301 of the bearing, and the diameter of the internal thread structure 701 is larger than the diameter of the mounting surface 1031.

[0050] By setting an internal thread structure 701 on the inner wall surface of the inner cavity and setting an external thread structure 106 on the connecting part extending into the inner cavity, the diameter of the internal thread structure 701 is larger than the diameter of the mounting surface 1031. This makes it difficult for the bearing and the internal thread structure 701 to collide when the bearing is installed, which not only improves the convenience of bearing installation, but also helps to protect the internal thread structure 701 and prevent the internal thread structure 701 from being damaged by collision and unable to be threadedly connected.

[0051] Preferably, Figure 2 As shown, the internal thread structure 701 is connected to the mounting surface 1031 via a transition surface, and the transition surface includes a conical surface 702 , and the small end of the conical surface 702 is connected to the mounting surface 1031 .

[0052] The transition surface includes a conical surface 702, and the small end of the conical surface 702 is connected to the mounting surface 1031. In this way, when the bearing is installed, the conical surface 702 guides the bearing, that is, the outer ring 301 of the bearing can slide along the conical surface 702 into the bearing chamber 103 surrounded by the mounting surface 1031, thereby improving the convenience of bearing installation.

[0053] Preferably, Figure 6 As shown, in the axial direction of the axial hole 102, the annular boss 101 includes a table surface 108 facing the pressure cover 2, and the pressure cover 2 includes a second annular surface 902 opposite to the table surface 108. A protruding structure 107 is provided on the second annular surface 902. When the connecting portion squeezes the outer ring 301 of the bearing, the protruding structure 107 squeezes the second annular surface 902 and deforms.

[0054] By providing the protruding structure 107 on the gland 2, when the gland 2 is rotated onto the annular boss 101, the protruding structure 107 squeezes the second annular surface 902 and deforms, and the firmness of the connection between the gland 2 and the annular boss 101 is further increased by the deformation of the protruding structure 107. The end cover 1 can be made of aluminum, which has good ductility. The protruding structure 107 is integrally formed with the gland 2, and the protruding structure 107 is also made of aluminum.

[0055] Furthermore, the protruding structure 107 can be set to be sawtooth-shaped. When the protruding structure 107 squeezes the transition surface, it deforms greatly and can cause a certain depression on the transition surface, thereby improving the firmness between the gland 2 and the annular boss 101.

[0056] Preferably, Figure 2 As shown, the connecting portion includes a pressing portion for pressing the outer ring 301 of the bearing, and a second elastic gasket 502 is arranged between the pressing portion and the outer ring 301 of the bearing.

[0057] The setting of the second elastic gasket 502 has three functions. First, the second elastic gasket 502 has a buffering and energy-absorbing effect on the vibration of the bearing, thereby reducing the influence of the bearing operation on the fixation of the gland 2. Second, the second elastic gasket 502 has an axial force on the gland 2, thereby improving the firmness of the connection between the gland 2 and the annular boss 101. Third, while ensuring effective squeezing force on the bearing, the second elastic gasket 502 can adjust the position of the gland 2 in the axial direction, that is, due to the action of the second elastic gasket 502, the rotation angle of the gland 2 has a certain range, so that the anti-rotation protrusion 5011 can be bent toward the gland 2 and be inserted into at least one anti-rotation groove 105. From the perspective of the anti-rotation protrusion 5011 being inserted into the anti-rotation groove 105, when all the anti-rotation protrusions cannot be completely inserted into the anti-rotation groove 105, the pressure cover 2 is rotated to rotate forward or reversely so that at least one anti-rotation protrusion 5011 is opposite to a anti-rotation groove 105. At this time, the anti-rotation protrusion 5011 is bent toward the pressure cover 2 and inserted into the anti-rotation groove 105; since the second elastic gasket 502 has an elastic effect, the pressure cover 2 can generate effective squeezing pressure on the outer ring 301 of the bearing by rotating forward or reversely within a certain range.

[0058] The second elastic gasket 502 cooperates with the first elastic gasket 501 to ensure that the outer ring 301 of the bearing is squeezed and positioned, while the gland 2 can also be stably fixed on the annular boss 101 .

[0059] Furthermore, the second elastic gasket 502 can be made of aluminum sheet, taking advantage of the ductility of aluminum. Thus, when the gland 2 rotates forward and generates a squeezing force on the aluminum sheet, if the anti-rotation protrusion 5011 cannot be inserted into the anti-rotation groove 105, since the aluminum sheet cannot recover by itself after deformation, the gland 2 needs to continue to rotate forward so that at least one anti-rotation protrusion 5011 can be bent and inserted into the anti-rotation groove 105. At this time, the aluminum sheet is deformed. When an aluminum sheet is used as the second elastic sheet, the good thermal conductivity of aluminum can also be used to accelerate the absorption of heat from the bearing, thereby accelerating the heat dissipation of the bearing and preventing the bearing temperature from being too high.

[0060] The present invention provides a motor, comprising a rotating shaft 703, a bearing and an end cover assembly as described in any one of claims 1 to 10; the bearing is arranged in the bearing chamber 103, a rotor core 704 is arranged on the rotating shaft 703, one end of the rotating shaft 703 is passed through the bearing, and the distance between the rotor core 704 and the annular boss 101 is less than the preset distance L.

[0061] like Figure 8 As shown, in the prior art, in order to install the retaining ring 801 for axially limiting the bearing, it is necessary to reserve a certain distance between the annular boss and the rotor core for the caliper to operate the retaining ring. The distance between the annular boss and the rotor core is a preset distance L. The present application does not need to set the retaining ring 801, nor does it need to reserve space for the caliper operation, which makes the distance between the rotor core 704 and the annular boss 101 can be less than the preset distance L. When the rotor core 704 has a certain length, it is beneficial to shorten the length of the motor and facilitate the miniaturization of the motor.

[0062] The motor adopts the above-mentioned end cover assembly, which is beneficial to the stable operation of the motor and the reduction of operating noise.

[0063] The end cover 1 is the front end cover. When installing the motor, first put the pressure cover 2 and the first elastic gasket 501 and the second elastic gasket 502 on the rotating shaft 703, then heat-fit the bearing, pass the rotating shaft 703 through the shaft hole 102 of the front end cover and put the bearing into the bearing chamber 103, then put the second elastic gasket 502 into the bearing chamber 103 and stick it together with the outer ring 301 of the bearing, put the first elastic gasket 501 on the first outer peripheral surface 601, and lock it with the pressure cover 2. When the pressure cover 2 is locked, the front end cover is installed on the rotating shaft 703 through the pressure cover 2 and the first elastic gasket 501, as shown in FIG. Figure 1 As shown. After the front cover, bearing, and rotating shaft 703 are installed in place, the gasket is installed into the outer diameter groove of the bearing chamber 103 of the end cover 1, and then the threaded gland 2 is installed. When rotating the gland 2, you can manually or use a screwdriver to insert the anti-rotation groove 105 on the gland 2 to knock and rotate it. After rotating the gland 2 to press the second elastic gasket 502, and then press the bearing, the anti-rotation protrusion 5011 on the first elastic gasket 501 is bent toward the gland 2 and inserted into the outer groove of the threaded gland 2. In this way, the circumferential limit of the gland 2 is achieved, and the bearing is effectively locked and limited. When the use environment of the motor is harsh, the outer ring 301 of the bearing in the rear end cover of the motor may not be axially limited, so as to avoid over-limitation caused by axial limit of both bearings when the rotating shaft 703 vibrates axially. When the use environment of the motor is good, the outer ring 301 of the bearing in the rear end cover can also be axially limited, and a screwdriver or wrench is inserted through the outlet hole on the motor housing to drive the gland 2 to rotate.

[0064] It is easy for those skilled in the art to understand that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. An end cover assembly for a motor, the end cover assembly comprising an end cover (1), the end cover (1) being provided with an axial hole (102), the surface of the end cover (1) facing the interior of the motor being provided with an annular boss (101) surrounding the axial hole (102), the annular boss (101) being provided with an inner cavity communicating with the axial hole (102), the inner cavity being provided with a bearing chamber (103), characterized in that: The end cover assembly further comprises a pressure cover (2), wherein the pressure cover (2) is threadedly connected to the annular boss (101), and the pressure cover (2) comprises an annular extrusion portion for extruding the outer ring (301) of the bearing and surrounding the shaft hole (102).

2. The end cap assembly according to claim 1, characterized in that: The end cover assembly further comprises a first elastic gasket (501), wherein the first elastic gasket (501) is arranged between the annular boss (101) and the pressure cover (2), and in the circumferential direction of the axial hole (102), the annular boss (101) circumferentially limits the first elastic gasket (501), and the first elastic gasket (501) circumferentially limits the pressure cover (2).

3. The end cap assembly according to claim 2, characterized in that: The outer circumferential surface of the annular boss (101) is provided with an annular step, and the annular step includes a first outer circumferential surface (601) facing away from the axial hole (102) and a first annular surface (901) facing the gland (2), and the first elastic gasket (501) is sleeved on the first outer circumferential surface (601) and is squeezed between the first annular surface (901) and the gland (2).

4. The end cap assembly according to claim 3, characterized in that: The first outer peripheral surface (601) is provided with a first clamping portion, and the inner peripheral surface of the first elastic gasket (501) is provided with a second clamping portion, and the second clamping portion is clamped together with the first clamping portion.

5. The end cap assembly according to claim 3, characterized in that: The outer ring (301) of the first elastic gasket (501) is provided with a stop protrusion (5011), the outer peripheral surface of the pressure cover (2) is the second outer peripheral surface (602), and the second outer peripheral surface (602) is provided with a stop groove (105). When the pressure cover (2) is set on the annular boss (101), the stop protrusion (5011) is bent toward the pressure cover (2) and can be inserted into the stop groove (105).

6. The end cap assembly according to claim 5, characterized in that: There are multiple and evenly distributed anti-rotation protrusions (5011), and there are multiple and evenly distributed anti-rotation grooves (105). The number of the anti-rotation protrusions (5011) is different from that of the anti-rotation grooves (105). In the axial direction, the projections of the multiple anti-rotation protrusions (5011) at least partially overlap with the projections of the multiple anti-rotation grooves (105).

7. The end cap assembly according to claim 1, characterized in that: The inner wall surface of the inner cavity includes an internal thread structure (701), the pressure cover (2) includes a connecting portion extending into the inner cavity, and the connecting portion includes an external thread structure (106) adapted to the internal thread structure (701); the bearing chamber (103) includes a mounting surface (1031) covering the outer cylindrical surface of the outer ring (301) of the bearing, and the diameter of the internal thread structure (701) is larger than the diameter of the mounting surface (1031).

8. The end cap assembly according to claim 7, characterized in that: The internal thread structure (701) is connected to the mounting surface (1031) via a transition surface, and the transition surface includes a conical surface (702), and the small end of the conical surface (702) is connected to the mounting surface (1031).

9. The end cap assembly according to claim 8, characterized in that: In the axial direction of the axial hole (102), the annular boss (101) includes a table surface (108) facing the pressure cover (2), and the pressure cover (2) includes a second annular surface (902) opposite to the table surface (108), and a protruding structure (107) is provided on the second annular surface (902). When the connecting portion squeezes the outer ring (301) of the bearing, the protruding structure (107) squeezes the second annular surface (902) and deforms.

10. The end cap assembly according to any one of claims 1 to 9, characterized in that: The connecting portion comprises a pressing portion for pressing the outer ring (301) of the bearing, and a second elastic gasket (502) is arranged between the pressing portion and the outer ring (301) of the bearing.

11. A motor, characterized in that: It comprises a rotating shaft (703), a bearing and an end cover assembly according to any one of claims 1 to 10; the bearing is arranged in the bearing chamber (103), a rotor core (704) is arranged on the rotating shaft (703), one end of the rotating shaft (703) is inserted into the bearing, and the distance between the rotor core (704) and the annular boss (101) is less than a preset distance L.

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