CN217563424U - Motor casing - Google Patents

Abstract

The utility model relates to a motor shell, which comprises a shell cylinder, a front end cover and a rear end cover; the front end cover and the rear end cover are respectively arranged at the front end and the rear end of the shell barrel in a covering mode, a partition plate is radially arranged inside the shell barrel and divides the inner space of the shell barrel into a first cavity and a second cavity, the first cavity is located at the front end of the second cavity, a partition plate shaft hole is formed in the center of the partition plate, and the first cavity and the second cavity are communicated through the partition plate shaft hole. The utility model discloses a set up shell section of thick bamboo, front end housing and rear end cap, integrated protection, support, space division's effect, satisfy external rotor electric machine application environment's needs, when effectively keeping apart the protection to the motor main part, compact structure improves space utilization to a dedicated motor lead wire passageway is provided. The motor outer rotor protection device is used for solving the problem that the existing motor outer rotor needs to be isolated and protected from the outside in the prior art, but cannot meet the protection requirement.

Description

Motor casing

Technical Field

The utility model relates to the technical field of motors, concretely relates to motor casing.

Background

The outer rotor motor is a special form of the motor, and is different from a common motor in that a rotor is arranged outside an inner stator, the outer rotor motor is in an opposite structure, the stator is arranged in the middle of the motor, and the rotor is arranged outside the motor. The outer rotor motor is higher than the inner rotor motor in output torque and output power ratio, and is commonly used for equipment such as a fan, a hub and the like, and a general motor rotor does not need extra shell protection, but if the outer rotor of the motor needs to be isolated and protected from the outside, the existing motor cannot meet the protection requirement, and still needs to be improved.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a motor casing for there is the condition that motor external rotor needs to carry out the isolation protection with the external world among the solution prior art, nevertheless the problem that current motor can't satisfy the protection demand.

In order to achieve one or a part or all of the above or other purposes, the present invention provides a motor casing for loading and protecting an outer rotor brushless motor main body, comprising a casing, a front end cover and a rear end cover; the front end cover and the rear end cover are respectively arranged at the front end and the rear end of the shell barrel in a covering mode, a partition plate is radially arranged inside the shell barrel and divides the inner space of the shell barrel into a first cavity and a second cavity, the first cavity is located at the front end of the second cavity, a partition plate shaft hole is formed in the center of the partition plate, and the partition plate shaft hole is communicated with the first cavity and the second cavity.

Furthermore, a plurality of ventilation holes are formed in the partition plate, and the ventilation holes are communicated with the first cavity and the second cavity.

Furtherly, a plurality of the ventilation hole along interval distribution is followed to the periphery of baffle, be equipped with a plurality of axially extended strengthening ribs on the inboard bobbin face of first cavity position in the shell section of thick bamboo, the strengthening rib is located interval department between ventilation hole and the ventilation hole.

Furthermore, a motor lead groove is formed in the shell barrel, and two ends of the motor lead groove are respectively communicated with the first cavity and the second cavity.

Furthermore, the circumference of the hole of the clapboard shaft hole protrudes towards the first cavity to form a cylindrical first boss.

Furthermore, the front end cover is an annular disc body, and a cylindrical second boss extends out of the periphery of the inner ring of the annular disc body towards the direction of the first cavity.

Furthermore, the inner cylinder wall of the second boss is provided with a positioning pin hole extending axially.

Furthermore, an annular retainer ring groove is radially formed in the inner cylinder wall of the second boss.

Furthermore, an annular ball groove is formed in the front side face of the annular disc body, and the circle center of the ball groove is the same as that of the annular disc body.

Furthermore, the front side surface of the shell cylinder is a first annular surface, a motor lead groove is formed in the first annular surface, the motor lead groove extends into the cylinder wall and is communicated with the second cavity, a lead groove notch is formed in the rear side surface of the annular disc body, when the shell cylinder is covered with the front end cover, the lead groove notch and the motor lead groove are combined to form a channel, and the channel is used for communicating the first cavity with the second cavity.

Furthermore, the rear side surface of the annular disc body is provided with a male spigot, the front end of the shell barrel is provided with a female spigot, and the male spigot is matched with the female spigot.

Furthermore, a plurality of positioning lugs protrude from the inner side barrel surface of the position of the second cavity in the shell barrel in the axis direction, and screws penetrate through the rear end cover and the positioning lugs to be locked.

Implement the embodiment of the utility model provides a, will have following beneficial effect:

the utility model discloses a set up shell section of thick bamboo, front end housing and rear end cap, integrated protection, support, space division's effect, satisfy external rotor electric machine application environment's needs, when effectively keeping apart the protection to the motor main part, compact structure improves space utilization. The motor outer rotor protection device is used for solving the problem that the existing motor outer rotor needs to be isolated and protected from the outside in the prior art, but cannot meet the protection requirement.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Wherein:

FIG. 1 is an exploded view of an electric machine;

FIG. 2 is a cross-sectional view of the motor;

FIG. 3 is a cross-sectional view of the motor housing;

FIG. 4 is a first perspective view of the shell;

FIG. 5 is a second perspective view of the shell;

FIG. 6 is a first perspective view of the front end cap;

FIG. 7 is a second perspective view of the front end cap;

FIG. 8 is a cross-sectional view of the front end cap, the first ring gear, and the retaining ring;

FIG. 9 is a perspective view of a rotor structure;

FIG. 10 is an exploded view of the rotor structure;

FIG. 11 is a perspective view of a motor rotor support;

fig. 12 is an exploded view of the reduction mechanism.

The reference numerals are explained below: 1-shell cylinder; 11-a separator; 12-a first annular face; 13-reinforcing ribs; 14-a first boss; 15-female spigot; 16-positioning the bump; 011-a first cavity; 012-a second cavity; 013-shaft holes of the partition plate; 014-vent; 015-motor lead slots; 2-front end cover; 21-an annular disc body; 211-male tang; 22-a second boss; 021-dowel hole; 022-retaining ring groove; 023-lead slot notches; 024-ball groove; 3-rear end cap; 4-a speed reduction mechanism; 41 a primary planetary assembly; 411 — first planetary gear; 412-a first sun gear; 413-a first ring gear; 42-a secondary planetary assembly; 421-a second planet gear; 422-second sun gear; 416 — a second ring gear; 43-a first gear holder; 44-a second gear support; 45-a third gear rack; 46-a fourth gear carrier; 461-output terminal; 47-a retainer ring; 48-reduction mechanism front cover; 5-a stator; 51-a stator core; 52-stator windings; 6-a rotor; 61-rotor core; 62-a permanent magnet; 7-a rotor support; 71-a web; 72-spigot boss; 73-locating posts; 74-inner circular boss; 071-open slot; 072-bracket shaft hole; 073-anti-drop pin hole; 074-annular groove; 075-bracket vent; 8-a rotating shaft; 9-a brake; 10-drive controller.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 1 to fig. 3, in order to apply the motor housing of the present invention to an external rotor brushless motor, the motor includes a motor housing, a speed reducing mechanism 4, a stator 5, a rotor 6, a rotor bracket 7, a rotating shaft 8, a brake 9 and a driving controller 10, wherein the motor housing includes a shell 1, a front end cap 2 and a rear end cap 3, which are sequentially connected.

The motor main body of the motor of the embodiment is a stator 5 and a rotor 6, the rotor 6 is arranged on the outer ring of the stator 5, and rotates relative to the stator 5, and an air gap exists between the stator 5 and the rotor 6. More specifically, the stator 5 includes a stator core 51 and a stator winding 52, the stator core 51 is a salient pole type inner stator core and is shaped like a ring column, a plurality of radial salient poles are arranged on the outer periphery of the stator core 51, and the stator winding 52 is wound on the salient poles to form a rectangular coil. The rotor 6 includes a rotor core 61 and permanent magnets 62, and both the rotor core 61 and the permanent magnets 62 are supported by the rotor holder 7 and rotated relative to the stator 5.

As shown in fig. 11, the motor rotor bracket is referred to as the rotor bracket 7 in this embodiment, the rotor bracket 7 includes a circular disk-shaped web 71, and an annular spigot boss 72 projects forward from an outer circumference of a front end face of the web 71, and it should be noted that the forward projection described herein is only for convenience of description and is not used by way of limitation, and the forward direction is a direction toward the lower left in fig. 10 by taking fig. 10 as an example. The annular surface of tang boss 72 front side is towards protruding a plurality of reference column 73 forward, and a plurality of reference column 73 are arranged along the annular surface interval of tang boss 72 front side, and the interval between two adjacent reference columns 73 forms open slot 071 for the location installation of permanent magnet 62, need not special frock, has simplified the installation of permanent magnet 62. Preferably, the positioning posts 73 are uniformly arranged.

Preferably, a chamfer is arranged at the joint between the inner cylindrical surface of the spigot boss 72 and the front end surface of the web 71 for transition, so that the permanent magnet 62 is conveniently guided and mounted.

Please refer to fig. 9 to fig. 10, which are a rotor structure, including the rotor support 7 and the rotor 6, where the rotor 6 is installed on the rotor support of the motor, i.e. the rotor support 7, the rotor 6 includes a rotor core 61 and a plurality of permanent magnets 62, the rotor core 61 is cylindrical and is sleeved outside the spigot boss 72, the rotor core 61 and the spigot boss 72 are in interference fit, and the permanent magnets 62 are inserted in the open slots 071 along the inner cylindrical surface of the rotor core 61. Adopt interference fit between the cooperation of rotor support and rotor core 61, replace traditional bolt to close the mode, simplify the structure.

As preferred scheme, rotor support 7 adopts aluminium alloy material to make, gives consideration to 6 supports of rotor, the moment of torsion transmission effect, and the motor performance that the magnetic leakage arouses is reduced again simultaneously, avoids outer circle tang boss 72 magnetic conduction to cause extra magnetic leakage.

Preferably, a plurality of support vent holes 075 are formed in the spoke 71, the support vent holes 075 are approximately fan-shaped, and the support vent holes 075 are arranged at intervals along a circumference to ensure heat exchange between spaces on the front side and the rear side of the spoke 71.

Referring to fig. 9 to 10, the rotor structure further includes a rotating shaft 8. The center of the amplitude plate 71 is provided with a support shaft hole 072, and the hole circumference of the support shaft hole 072 extends forwards to form a cylindrical inner circular boss 74. The rotating shaft 8 is inserted into the support shaft hole 072, and the rotating shaft 8 is in interference fit with the support shaft hole 072. Furthermore, a plurality of anti-drop pin holes 073 are formed in the wall of the inner circular boss 74, in this embodiment, two anti-drop pin holes 073 are symmetrically arranged, a screw hole is formed in the rotating shaft 8 and corresponds to the anti-drop pin hole 073, a screw is arranged to penetrate through the screw hole in the rotating shaft 8 and the anti-drop pin hole 073, and the screw is used as a positioning pin and used for connecting the rotating shaft 8 and the inner circular boss 74 and circumferentially limiting the same so as to ensure reliable connection between the rotating shaft 8 and the inner circular boss 74. The inner circle boss 74 and the rotating shaft 8 are in a combined structure of interference fit and a positioning pin, and the structural reliability is improved. The rotor structure of this embodiment is for single bearing support structure to set up open slot 071 that is used for the installation location of permanent magnet 62, for the duplex bearing support scheme that common outer rotor permanent magnet brushless motor generally taken at present, rotor both sides all have a rotor support to be used for supporting the rotor promptly, rotor support and rotor adopt the bolt to form integrative structure to the square, the structural component of the rotor structure of this embodiment reduces, and it is more convenient to install.

As shown in fig. 3, for the utility model discloses a motor casing, including shell 1, front end housing 2 and rear end cap 3 cover respectively and locate shell 1's front end and rear end, shell 1 is inside radially to be equipped with baffle 11, baffle 11 is the disc body, baffle 11 separates the inner space of shell 1 for first cavity 011 and second cavity 012, first cavity 011 is located the front end of second cavity 012, baffle shaft hole 013 has been seted up at baffle 11 center, baffle shaft hole 013 hole week forms the first boss 14 of tube-shape toward the direction arch of first cavity 011. The partition shaft hole 013 connects the first cavity 011 and the second cavity 012. As shown in fig. 2, the first chamber 011 is mainly for mounting the rotor 6, the stator 5 and the rotor holder 7, and the second chamber 012 is mainly for mounting the brake 9 and the driving controller 10.

As shown in fig. 2, the partition shaft hole 013 is used for allowing the rotating shaft 8 to pass through and connect with the brake 9, a bearing, such as a ball bearing, is installed between the rotating shaft 8 and the inner cylindrical wall of the first boss 14 to reduce friction so as to ensure smooth relative rotation between the rotating shaft 8 and the first boss 14, and in the front-rear direction, the bearing is sandwiched between the inner circular boss 74 of the rotor holder 7 and the partition 11 to perform axial limiting. An annular groove 074 is concavely arranged on the rear end face and in the direction of the front end face of the amplitude plate 71, and the annular groove 074 is positioned on the periphery of the bracket shaft hole 072. The annular groove 074 not only enhances the rigidity of the rotor support 7, but also saves the axial space, and the annular groove 074 is used for matching the shapes of the inner circular boss 74 and the bearing, so that the whole motor is more compact while providing an avoiding space. The brake 9 is arranged at the rear end of the partition plate 11, and a plurality of through holes are formed in the partition plate 11 and used for installing screws to fix the brake 9 on the partition plate 11.

As shown in fig. 4 and 5, preferably, the partition 11 is opened with a plurality of vent holes 014, and the vent holes 014 conduct the first cavity 011 and the second cavity 012, so as to exchange heat between the first cavity 011 and the second cavity 012. A plurality of ventilation holes 014 are along the periphery of baffle 11 along interval distribution, are equipped with a plurality of axially extended strengthening ribs 13 on the inboard cylinder face of first cavity 011 position in the shell section of thick bamboo 1 for strengthen shell section of thick bamboo 1's rigidity, strengthening rib 13 is located the interval department between ventilation hole 014 and the ventilation hole 014. More specifically, the rib 13 extends in the front-rear direction from the outer peripheral edge of the front end surface of the partition plate 11 to the first annular surface 12, which is the front side surface of the housing tube 1.

Referring to fig. 1 to 3, a plurality of positioning protrusions 16 protrude from the inner surface of the second cavity 012 of the shell 1 toward the axial direction, through holes are formed in the positioning protrusions 16, and screws are inserted between the rear end cover 3 and the positioning protrusions 16 for locking. More specifically, a certain distance is reserved between the positioning bump 16 and the rear end cover 3, the reserved distance is used for installing a controller PCB board where the driving controller 10 is located, that is, a through hole is formed in the PCB board for a screw to pass through, and the controller PCB board is clamped between the rear end cover 3 and the positioning bump 16, so that the driving controller 10 is fixedly installed. Stopper 9 is worn out to 8 rear end faces of pivot, is fixed with encoder magnet on the 8 rear end faces of pivot, and the encoder chip is installed to the last corresponding position of PCB board, and the encoder chip is used for induction encoder magnet to judge 8 rotation angles of pivot. The positioning lug 16 can ensure the centering of the magnetic encoder and the encoder magnet, reduce the eccentric error of the encoder and improve the control precision of the driving device.

The front end cover 2 is an annular disk body 21, and the inner ring circumference of the annular disk body 21 extends out of a cylindrical second boss 22 towards the direction of the first cavity 011. The second boss 22 is inserted into the first cavity 011. The stator core 514 is fitted around the outer circumference of the second boss 22 and fixed to the outer circumferential surface.

The rear side surface of the annular disc body 21 is provided with a male spigot 211, the front end of the shell barrel 1 is provided with a female spigot 15, and the male spigot 211 is matched with the female spigot 15.

Referring to fig. 3 to 5, a motor lead slot 015 is disposed on the housing barrel 1, and two ends of the motor lead slot 015 are respectively communicated with the first cavity 011 and the second cavity 012. The lead of the motor stator 5 can be ensured to be led to the driving controller 10 through the inside of the shell barrel 1, so that the external interference is reduced, and the reliability of the driving device is improved.

As shown in fig. 3, as a preferred scheme, the front side surface of the casing 1 is a first annular surface 12, a motor lead groove 015 is formed in the first annular surface 12, the motor lead groove 015 extends into the casing wall and communicates with the second cavity 012, and a lead groove notch 023 is formed in the rear side surface of the annular disk 21, as shown in fig. 3 and 7, when the casing 1 is covered with the front end cover 2, the lead groove notch 023 and the motor lead groove 015 are merged to form a channel, the channel communicates the first cavity 011 and the second cavity 012, the channel is used for allowing a lead of the motor stator 5 to pass through, the lead is introduced into the second cavity 012 from the first cavity 011 and connected with the drive controller 10, so as to achieve electrical connection between the stator 5 and the drive controller 10. The motor lead groove 015 may pass axially through the inside of the reinforcing bar 13.

Referring to fig. 1, 2 and 12 in combination, the reduction mechanism 4 is mounted on the front end of the front cover 2. The speed reducing mechanism 4 comprises a primary planet assembly 41 and a secondary planet assembly 42, wherein the primary planet assembly 41 is mainly positioned inside the second boss 22 of the front end cover 2, the secondary planet assembly 42 is mainly positioned on the front side of the annular disc body 21 of the front end cover 2, and the primary planet assembly 41 is in transmission connection with the secondary planet assembly 42.

The primary planetary assembly 41 comprises a first sun gear 412, a first planetary gear 411 and a first ring gear 413 which are sequentially installed in a meshed mode from inside to outside. In the present embodiment, the number of the first planetary gears 411 is three.

As shown in fig. 8, the first gear ring 413 is installed inside the second boss 22 and abuts against the inner cylinder wall of the second boss 22, an annular retainer groove 022 is radially formed in the inner cylinder wall of the second boss 22, the retainer groove 022 is located at the rear end of the first gear ring 413, the retainer groove 022 is used for installing a retainer ring 47, and the retainer ring 47 abuts against the rear end of the first gear ring 413 to axially limit the first gear ring 413, that is, the front-rear direction is limited. The retainer ring 47 is a notch-type clamp which is convenient for extrusion deformation to be assembled into the retainer ring groove 022 from the rear end forwards and then flicked to reset and clamp. In the axial direction, the inner cylindrical wall of the second boss 22 is provided with a convex retaining ring surface which abuts against the front end surface of the first gear ring 413, and the retaining ring surface is matched with the retaining ring 47 to axially limit the first gear ring 413. The inner tube wall of the second boss 22 is provided with an axially extending positioning pin hole 021 which is in a semi-circular through groove shape, the corresponding position on the periphery of the first gear ring 413 is provided with an axially extending semi-circular groove-shaped gear ring pin hole, and through installing a bolt, the bolt is simultaneously inserted into the positioning pin hole 021 of the second boss 22 and the gear ring pin hole on the periphery of the first gear ring 413 for circumferentially limiting the first gear ring 413.

As shown in fig. 2, the front end of the rotating shaft 8 is fixedly connected to the shaft body of the first sun gear 412, and the rotating shaft 8 and the first sun gear 412 rotate synchronously. The periphery of the front end of the rotating shaft 8 is sleeved with a first gear support 43, a bearing is arranged between the first gear support 43 and the periphery of the front end of the rotating shaft 8 for connection, and the rotating shaft 8 and the first gear support 43 can rotate relatively.

As shown in fig. 12, the second gear holder 44 is disposed at the front end of the first gear holder 43, the first gear holder 43 extends upwards to form a plurality of connecting arms, the connecting arms are fixedly connected with the second gear holder 44, a space is reserved between the connecting arms for placing three first planet gears 411, and shaft bodies at two ends of the first planet gears 411 are respectively inserted into the first gear holder 43 and the second gear holder 44.

The first planetary gear 411 includes an external gear portion and an internal shaft body, which are connected to each other by a bearing, and the external gear portion is rotatable around the internal shaft body.

The rotation shaft 8, the first sun gear 412, the rotor 6 and the rotor holder 7 can be regarded as being integrally fixed with each other by taking the axis of the rotation shaft 8 as the motor axis, when the rotor 6 rotates, the four rotate synchronously, the three first planetary gears 411 meshed with the first sun gear 412 rotate along with the rotation, the three first planetary gears 411 rotate around the first sun gear 412, and therefore the first gear holder 43 and the second gear holder 44 at the front end and the rear end of the first planetary gears 411 rotate around the motor axis synchronously along with the three first planetary gears 411.

The secondary planetary assembly 42 comprises a second sun gear 422, a second planetary gear 421 and a second ring gear 423 which are sequentially installed in a meshing manner from inside to outside.

The second sun gear 422 is fixedly mounted above the second gear support 44, the second sun gear 422 and the second gear support 44 are locked by screws, and the second sun gear 422 and the second gear support 44 rotate around the axis of the motor synchronously.

Three second planet gears 421 are all meshed with the second sun gear 422 and rotate around the second sun gear 422, a third gear support 45 is arranged in front of the second gear support 44, the third gear support 45 is located on the front side face of the annular disc body 21 of the front end cover 2, an annular ball groove 024 is arranged on the front side face of the annular disc body 21, and the circle center of the ball groove 024 is the same as that of the annular disc body 21. The rear end face of the third gear support 45 is correspondingly provided with an annular or multi-section arc-shaped support ball groove, and a plurality of balls are arranged between the support ball groove and the ball groove 024, so that the third gear support 45 can rotate relative to the annular disc body 21 and acts like a bearing.

The second planetary gear 421 is located at the front end of the third gear carrier 45, a fourth gear carrier 46 is arranged at the front side of the second planetary gear 421, and shaft bodies at two ends of the second planetary gear 421 are respectively inserted into the third gear carrier 45 and the fourth gear carrier 46.

The second planetary gear 421 includes an outer gear portion and an inner shaft portion, which are integrally formed with each other, and both ends of the shaft portion are mounted on the third gear holder 45 and the fourth gear holder 46 through bearings.

A cylinder is protruded from the center of the fourth gear support 46 to the front end as an output end 461.

The second gear ring 423 engaged with the outer ring of the second planetary gear 421 is fixed on the periphery of the front end face of the ring disc 21, and a speed reduction mechanism front cover 48 is provided to cover the front end of the secondary planetary assembly 42, and the outer edge of the speed reduction mechanism front cover 48 is fixedly connected with the periphery of the second gear ring 423. The center of the front cover 48 of the speed reduction mechanism is provided with an opening for the output end 461 to pass through, and a bearing is arranged between the hole wall of the opening in the center of the front cover 48 of the speed reduction mechanism and the output end 461 for connection.

When the motor is operated, that is, when the rotor 6 rotates, the rotating shaft 8, the first sun gear 412, the rotor 6 and the rotor holder 7 rotate synchronously, the three first planet gears 411 engaged with the first sun gear 412 rotate therewith, the three first planet gears 411 rotate around the first sun gear 412, so that the first gear holder 43 and the second gear holder 44 at the front and rear ends of the first planet gears 411 rotate around the motor axis synchronously with the three first planet gears 411, the second sun gear 422 fixed to the second gear holder 44 also rotates synchronously with the first planet gears 411, and the three second planet gears 421 are forced to rotate around the second sun gear 422, and the third gear holder 45 and the fourth gear holder 46 arranged in front of and behind the second planet gears 421 rotate around the motor axis synchronously with the three second planet gears 421, thereby realizing the rotation of the output terminal 461.

The utility model discloses a set up shell section of thick bamboo 1, front end housing 2 and rear end cap 3, integrated protection, support, space division's effect, satisfy external rotor electric machine application environment's needs, when effectively keeping apart the protection to the motor main part, compact structure improves space utilization to a dedicated motor lead wire passageway is provided. The motor outer rotor protection device is used for solving the problem that the existing motor outer rotor needs to be isolated and protected from the outside in the prior art, but cannot meet the protection requirement.

Although the present invention has been described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the present invention.

Claims (12)

1. A motor housing, characterized by: comprises a shell (1), a front end cover (2) and a rear end cover (3); front end housing (2) and rear end cap (3) are covered respectively and are located the front end and the rear end of shell section of thick bamboo (1), the inside radial baffle (11) that is equipped with of shell section of thick bamboo (1), baffle (11) will the inner space of shell section of thick bamboo (1) separates for first cavity (011) and second cavity (012), first cavity (011) is located the front end of second cavity (012), baffle shaft hole (013) has been seted up at baffle (11) center, baffle shaft hole (013) switches on first cavity (011) and second cavity (012).

2. The motor housing of claim 1, wherein: seted up a plurality of ventilation holes (014) on baffle (11), ventilation hole (014) switches on first cavity (011) and second cavity (012).

3. The motor housing of claim 2, wherein: a plurality of ventilation hole (014) along interval distribution is followed to the periphery of baffle (11), be equipped with a plurality of axially extended strengthening ribs (13) on the inboard face of the position of first cavity (011) position in shell section of thick bamboo (1), strengthening rib (13) are located the interval department between ventilation hole (014) and ventilation hole (014).

4. The motor housing of claim 1, wherein: the shell barrel (1) is provided with a motor lead groove (015), and two ends of the motor lead groove (015) are communicated with the first cavity (011) and the second cavity (012) respectively.

5. The motor housing of claim 1, wherein: the periphery of the partition plate shaft hole (013) protrudes towards the first cavity (011) to form a cylindrical first boss (14).

6. The motor housing of claim 1, wherein: the front end cover (2) is an annular disc body (21), and the inner ring circumference of the annular disc body (21) extends out of a cylindrical second boss (22) towards the direction of the first cavity (011).

7. The motor housing of claim 6, wherein: the inner cylinder wall of the second boss (22) is provided with an axially extending positioning pin hole (021).

8. The motor housing of claim 6, wherein: an annular retainer ring groove (022) is radially formed in the inner cylinder wall of the second boss (22).

9. The motor housing of claim 6, wherein: an annular ball groove (024) is formed in the front side face of the annular disc body (21), and the circle center of the ball groove (024) is the same as that of the annular disc body (21).

10. The motor housing of claim 6, wherein: the front side surface of the shell barrel (1) is a first annular surface (12), a motor lead groove (015) is formed in the first annular surface (12), the motor lead groove (015) extends towards the inner side of the barrel wall and is communicated to the second cavity (012), a lead groove notch (023) is formed in the rear side surface of the annular disk body (21), when the shell barrel (1) is covered with the front end cover (2), the lead groove notch (023) and the motor lead groove (015) are combined to form a channel, and the channel is communicated with the first cavity (011) and the second cavity (012).

11. The motor housing of claim 6, wherein: the rear side face of the annular disc body (21) is provided with a male spigot (211), the front end of the shell barrel (1) is provided with a female spigot (15), and the male spigot (211) is matched with the female spigot (15).

12. The motor housing of claim 1, wherein: the inner side barrel surface of the position of the second cavity (012) in the shell barrel (1) protrudes a plurality of positioning lugs (16) in the axis direction, and a screw is arranged between the rear end cover (3) and the positioning lugs (16) in a penetrating manner for locking.

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