CN217824582U

CN217824582U - In-wheel motor

Info

Publication number: CN217824582U
Application number: CN202221825547.1U
Authority: CN
Inventors: 陈正平; 高超
Original assignee: Zhejiang Yadea Motorcycle Co Ltd
Current assignee: Zhejiang Yadea Motorcycle Co Ltd
Priority date: 2022-07-14
Filing date: 2022-07-14
Publication date: 2022-11-15
Anticipated expiration: 2032-07-14

Abstract

The utility model belongs to the technical field of electrical equipment, a wheel hub motor is disclosed, wheel hub motor includes the motor shaft, stator and rotor, the motor shaft is located to the fixed cover of stator, the rotor rotationally overlaps and locates on the motor shaft, the rotor includes motor casing, the motor cavity has been seted up in the motor casing, the stator sets up in the motor cavity, set up the through wires hole with the motor cavity intercommunication on the motor shaft, outside cable is worn to locate in the through wires hole gets into the motor cavity, set up the bleeder vent with the motor cavity intercommunication on the motor casing, install waterproof ventilative subassembly in the bleeder vent, set up the injecting glue hole with the through wires hole intercommunication on the motor shaft. The utility model provides an in-wheel motor, the waterproof leakproofness at motor shaft through wires hole position is strong, and the inside and outside gas of motor can effectively be exchanged so that the internal and external pressure of motor remain stable to can effectively prevent the inside intaking of motor in the in-process of gas exchange, simple structure, the practicality is strong.

Description

In-wheel motor

Technical Field

The utility model relates to an electrical equipment technical field especially relates to an in-wheel motor.

Background

The waterproof sealing performance of the motor is one of important performance indexes which influence the normal use of the motor. In the prior art, a motor shaft is provided with a threading hole, and an external connection cable enters the motor cavity through the threading hole and is connected with a phase line on a stator inside the motor cavity. Certain gaps are formed between the threading holes and the external connecting cables, and the gaps play roles in exchanging gas between the motor cavity and the external environment and keeping the internal pressure and the external pressure of the motor stable, namely when the internal temperature of the motor rises, the internal pressure of the motor increases and generates positive pressure difference with the outside, so that the gas in the motor cavity is discharged out of the motor through the gaps; after the interior of the motor is cooled, the pressure inside the motor is reduced, and negative pressure difference is generated between the motor and the outside, so that outside air is sucked into the cavity of the motor through the gaps. The gaps formed by the threading holes and the external connecting cables are indefinite in shape, and the waterproof and breathable devices cannot be directly added in the gaps, so that the gaps do not have a waterproof function, when external gas enters the motor cavity, water vapor mixed in the gas enters the motor cavity from the gaps, the motor enters water, and motor faults are caused.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an in-wheel motor avoids external steam to get into the motor cavity under the stable condition of atmospheric pressure inside and outside can keeping the motor.

To achieve the purpose, the utility model adopts the following technical proposal:

the utility model provides a wheel hub motor, includes motor shaft, stator and rotor, the fixed cover of stator is located on the motor shaft, the rotor rotationally overlaps and locates on the motor shaft, the rotor includes motor casing, the motor cavity has been seted up in the motor casing, the stator set up in the motor cavity, set up on the motor shaft with the through wires hole of motor cavity intercommunication, outside cable wear to locate the through wires hole gets into in the motor cavity, set up on the motor casing with the bleeder vent of motor cavity intercommunication, install waterproof ventilative subassembly in the bleeder vent, set up on the motor shaft with the notes gluey hole of through wires hole intercommunication.

Optionally, the bleeder vent is including being first hole portion and the second hole portion that the echelonment set up, first hole portion orientation the motor cavity sets up, the aperture of first hole portion is less than the aperture of second hole portion, waterproof ventilative subassembly includes waterproof ventilated membrane and ventilative pressure head, waterproof ventilated membrane is located cover is located in the second hole portion on the first hole portion, ventilative pressure head set up in the second hole portion, just it is provided with ventilative structure to link up on the ventilative pressure head.

Optionally, the ventilation structure is provided as a ventilation groove, and the ventilation groove is communicated with and extends from the inner end surface of the ventilation pressure head to the outer end surface of the ventilation pressure head.

Optionally, the ventilation groove includes a first groove portion and a second groove portion, the first groove portion is provided on the inner end surface of the ventilation pressure head, the second groove portion is provided on the side end surface of the ventilation pressure head, the first groove portion extends from the middle of the inner end surface of the ventilation pressure head to the edge of the inner end surface of the ventilation pressure head, the first end of the second groove portion is communicated with one end, located on the edge of the inner end surface of the ventilation pressure head, of the first groove portion, and the second end of the second groove portion extends to the outer end surface of the ventilation pressure head.

Optionally, the first groove portion and the second groove portion are correspondingly provided with a plurality of grooves, and a communication groove communicated with the first groove portions is further formed in the inner end face of the air-permeable pressure head.

Optionally, the ventilative pressure head is provided with an accommodating cavity, the accommodating cavity is provided with a first air guide hole communicated with the inner end face of the ventilative pressure head and a second air guide hole communicated with the outer end face of the ventilative pressure head, the accommodating cavity, the first air guide hole and the second air guide hole jointly form the ventilation structure, and the waterproof breathable film is arranged in the accommodating cavity and covered on the first air guide hole.

Optionally, a clamping head is convexly arranged on the inner end face of the ventilating pressure head, and when the ventilating pressure head is installed in the second hole portion, the clamping head penetrates through the first hole portion and is clamped with the inner end wall of the motor cavity.

Optionally, a connection end head is convexly arranged on an inner end face of the ventilating pressure head, the first air guide hole extends along a protruding direction of the connection end head and penetrates through the connection end head, and when the ventilating pressure head is installed in the second hole portion, the connection end head penetrates through the first hole portion and is in threaded connection with the first hole portion.

Optionally, a sealing sleeve is arranged in the threading hole, the external cable penetrates through the sealing sleeve and enters the motor cavity, and the sealing sleeve is used for plugging a gap between the external cable and the threading hole.

Optionally, the outer surface of the sealing sleeve is further provided with a plurality of sealing teeth.

Has the advantages that:

the utility model provides an in-wheel motor through set up the injecting glue hole with the through wires hole intercommunication on the motor shaft, in the external cable wears to establish the through wires hole and gets into the motor cavity and connect the completion after, operating personnel pours into sealed glue into to the injecting glue hole to plug up the clearance between inside and the external cable of through wires hole, prevent that the steam in the external environment from getting into the motor cavity from the through wires hole, guarantee the leakproofness of through wires hole portion. In addition, through set up the bleeder vent with the motor cavity intercommunication on motor casing to at the waterproof ventilative subassembly of downthehole installation of bleeder vent, when the inside pressure difference that produces of motor cavity with external environment, motor cavity carries out gas exchange through the bleeder vent with external environment, makes motor cavity and external environment's pressure remain stable, and waterproof ventilative subassembly can block the steam of mixing in the external gas, effectively prevents the inside intake of motor, simple structure, the practicality is strong.

Drawings

Fig. 1 is a cross-sectional view of an in-wheel motor according to an embodiment of the present invention;

fig. 2 is a partially enlarged schematic view of the present invention at a in fig. 1;

fig. 3 is a schematic structural view of a ventilating press head according to an embodiment of the present invention;

fig. 4 is a schematic diagram illustrating the results of a motor shaft portion according to an embodiment of the present invention;

fig. 5 is a schematic diagram illustrating another perspective view of a portion of a motor shaft according to an embodiment of the present invention;

fig. 6 is a partially enlarged schematic view of a threading hole portion of a motor shaft according to a first embodiment of the present invention;

fig. 7 is a schematic structural view of an external cable sleeve sealing sleeve and an injection molding head according to a first embodiment of the present invention;

fig. 8 is a cross-sectional view of an injection head mounted on an external cable according to a first embodiment of the present invention;

fig. 9 is a partial cross-sectional view of an in-wheel motor according to a second embodiment of the present invention;

FIG. 10 is an exploded view of the vent and the waterproof vent assembly provided in the second embodiment of the present invention;

fig. 11 is a partial sectional view of a hub motor according to a third embodiment of the present invention;

fig. 12 is an exploded view of the vent and the waterproof vent assembly provided in the third embodiment of the present invention.

In the figure:

100. a motor shaft; 110. threading holes; 120. injecting glue holes;

200. a stator;

300. a rotor; 310. a motor housing; 320. a motor cavity; 330. air holes are formed; 331. a first hole portion; 332. a second hole portion;

400. a waterproof breathable component; 410. a waterproof breathable film; 420. a breathable pressure head; 421. a ventilation groove; 4211. a first groove portion; 4212. a second groove portion; 422. a communicating groove; 423. an accommodating chamber; 424. a first air guide hole; 425. a second air guide hole; 426. a clamping head; 427. connecting the end heads; 428. a seal ring;

510. sealing sleeves; 511. a seal tooth; 520. an injection molding head; 521. a separation support frame; 5211. a support isolation groove; 600. an external cable; 610. and connecting the wires.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", and the like are used based on the orientations and positional relationships shown in the drawings, and are only for convenience of description and simplification of operation, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

Example one

The embodiment provides an in-wheel motor, refer to fig. 1 to 6, in-wheel motor includes motor shaft 100, stator 200 and rotor 300, the fixed cover of stator 200 is located on motor shaft 100, rotor 300 rotationally overlaps and locates on motor shaft 100, rotor 300 includes motor casing 310 and sets up the motor cavity 320 in motor casing 310, stator 200 sets up in the motor cavity, set up the through wires hole 110 with the motor cavity intercommunication on the motor shaft 100, outside cable 600 wears to locate in through wires hole 110 gets into motor cavity 320, set up the bleeder vent 330 with motor cavity 320 intercommunication on the motor casing 310, install waterproof ventilative subassembly 400 in the bleeder vent 330, set up the injecting glue hole 120 with the through wires hole 110 intercommunication on the motor shaft 100.

In this embodiment, through seting up the injecting glue hole 120 with through wires hole 110 intercommunication on motor shaft 100, outside cable 600 wears to establish through wires hole 110 and gets into in motor cavity 320 and connect the completion after, operating personnel pours into sealed glue into through wires hole 110 through injecting glue hole 120 to the clearance shutoff between inside and the outside cable 600 of through wires hole 110, prevent that the steam in the external environment from getting into motor cavity 320 from through wires hole 110, guarantee the leakproofness of through wires hole 110 part. In addition, through set up the bleeder vent 330 with motor cavity 320 intercommunication on motor casing 320, and install waterproof ventilative subassembly 400 in bleeder vent 330, when motor cavity 320 inside and external environment produced the pressure differential, motor cavity 320 carries out gas exchange through bleeder vent 330 with external environment, makes motor cavity 320 and external environment's pressure remain stable, and waterproof ventilative subassembly 400 can block the steam of mixing in the external gas, effectively prevents the inside intake of motor, moreover, the steam generator is simple in structure, therefore, the clothes hanger is strong in practicability.

In addition, after the sealant is injected into the through hole 110, the external cable 600 in the through hole 110 can be reliably fixed, and the external cable 600 can be pulled out by external force.

Further, referring to fig. 2, the vent 330 includes a first hole 331 and a second hole 332 disposed in a step shape, the first hole 331 is disposed toward the motor cavity 320, an aperture of the first hole 331 is smaller than an aperture of the second hole 332, the waterproof and breathable assembly 400 includes a waterproof and breathable film 410 and a vent head 420, the waterproof and breathable film 410 is disposed in the second hole 332 and covers the first hole 331, the vent head 420 is disposed in the second hole 332, and a breathable structure is disposed on the vent head 420 in a penetrating manner. In this embodiment, the second hole portion 332 is mainly used for accommodating the waterproof breathable assembly 400, and the breathable pressing head 420 can shield the waterproof breathable film 410, thereby preventing the waterproof breathable film 410 from being directly exposed to the external environment.

In this embodiment, the waterproof breathable film 410 is made of teflon.

In this embodiment, the waterproof breathable film 410 is directly adhered to the first hole 331 and securely covers the first hole 331.

Further, referring to fig. 3, the ventilation structure is provided as ventilation grooves 421, and the ventilation grooves 421 are communicated with and extend from the inner end surface of the ventilation head 420 to the outer end surface of the ventilation head 420. Specifically, the air permeation groove 421 includes a first groove portion 4211 and a second groove portion 4212, the first groove portion 4211 is provided in an inner end surface of the air permeation pressure head 420, the second groove portion 4212 is provided in a side end surface of the air permeation pressure head 420, the first groove portion 4211 extends from a middle portion of the inner end surface of the air permeation pressure head 420 to an edge of the inner end surface of the air permeation pressure head 420, a first end of the second groove portion 4212 communicates with an end of the first groove portion 4211 located at the edge of the inner end surface of the air permeation pressure head 420, and a second end of the second groove portion 4212 extends to the outer end surface of the air permeation pressure head 420.

In this embodiment, the inner end surface of the air-permeable pressure head 420 is an end surface facing the motor cavity 320, and the outer end surface of the air-permeable pressure head 420 is an end surface facing the external environment. Specifically, when the air-permeable ram 420 is mounted to the second hole portion 332, a side end surface of the air-permeable ram 420 is inserted into the second hole portion 332 and is in interference fit with the second hole portion 332, and the first hole portion 331, the first groove portion 4211, and the second groove portion 4212 together form a ventilation channel for exchanging gas between the motor cavity 320 and the external environment, so that the gas exchange between the motor cavity 320 and the external environment can be ensured to be reliably performed even when the second hole portion 332 is effectively blocked.

Furthermore, a plurality of first groove portions 4211 and a plurality of second groove portions 4212 are correspondingly arranged, and the inner end surface of the air-permeable pressure head 420 is further provided with a communication groove 422 communicated with the plurality of first groove portions 4211. The communication groove 422 enables the plurality of first groove portions 4211 to be communicated, so that the effectiveness and reliability of gas exchange between the motor cavity 320 and the external environment can be improved.

Further, as shown in fig. 5 to 8, a sealing sleeve 510 is disposed in the threading hole 110, the external cable 600 is inserted into the sealing sleeve 510 and enters the motor cavity 320, and the sealing sleeve 510 is used for sealing a gap between the external cable 600 and the threading hole 110. In this embodiment, the thickness of the sealing sleeve 510 gradually increases from the end close to the motor cavity 320 to the end away from the motor cavity 320, so that the sealing sleeve 510 is more and more tightened with respect to the wire penetrating hole 110 when receiving an inward pulling force, thereby further ensuring the reliability of the sealing sleeve 510.

Further, the outer surface of the gland 510 is also provided with a plurality of seal teeth 511. The sealing teeth 511 can be in further interference contact with the threading hole 110, and the fixing effect of the sealing sleeve 511 in the threading hole 110 is effectively guaranteed.

Further, the outer cable 600 is further sleeved with an injection molding head 520, and the injection molding head 520 is internally provided with a separation support 521 capable of separating the plurality of connecting wires 610 in the outer cable 600. Specifically, when the head 520 is moulded plastics in the installation, cut off outside cable 600 in the outer insulating line skin of the head 520 installation site of moulding plastics in order to expose many connecting wires 610 in outside cable 600, a plurality of separate supporting groove 5211 that can the holding connecting wire 610 has been seted up on separate supporting frame 521, after many connecting wires 610 expose, use separate supporting frame 521 to effectively separate many connecting wires 610, use sealed glue to mould plastics to the inside of the head 520 of moulding plastics afterwards, thereby can carry out reliable effectual packing with the gap between many connecting wires 610 in the outside cable 600, avoid external steam to pass through in the inside entering motor cavity 320 of outside cable 600, further guarantee waterproof sealing effect.

Example two

Referring to fig. 9 to 10, the hub motor provided in this embodiment is different from the first embodiment in the structure of the waterproof and breathable assembly. Specifically, ventilative pressure head 420 has been seted up and has been held the chamber 423, holds the chamber 423 and has seted up the first air guide hole 424 with the interior terminal surface intercommunication of ventilative pressure head 420 and the second air guide hole 425 with the outer terminal surface intercommunication of ventilative pressure head 420, holds chamber 423, first air guide hole 424 and second air guide hole 425 and constitutes ventilative structure jointly, and waterproof ventilated membrane 410 sets up in holding chamber 423 and covers and locate first air guide hole 424.

In this embodiment, the waterproof breathable film 410 is disposed inside the breathable pressure head 420, and the breathable pressure head 420 can further protect the waterproof breathable film 410. First hole portion 331, first air guide hole 424, hold chamber 423 and second air guide hole 425 and have constituteed the passageway of taking a breath that motor cavity 320 and external environment carried out gas exchange jointly to guarantee that motor cavity 320 and external environment carry out reliable gas exchange, waterproof ventilated membrane 410 can block steam at the gas exchange in-process simultaneously, thereby realize waterproof ventilation function.

Preferably, a sealing ring 428 is disposed between the air-permeable ram 420 and the second bore portion 332, so that the sealing effect between the air-permeable ram 420 and the second bore portion 332 can be further enhanced.

Further, a clamping joint 426 is convexly disposed on an inner end surface of the air-permeable pressure head 420, and when the air-permeable pressure head 420 is installed in the second hole portion 332, the clamping joint 426 penetrates through the first hole portion 331 and is clamped with the inner end wall of the motor cavity 320. Specifically, first hole portion 331 sets up to the bell mouth, and joint 426 interval is provided with two, and when the ventilative pressure head 420 of installation, ventilative pressure head 420 is pegged graft in second hole portion 332, and two joint 426 can the joint wear to establish behind first hole portion 331 on the interior end wall of motor cavity 320 correspondence end, simple structure, easy dismounting.

EXAMPLE III

Referring to fig. 11 to 12, the hub motor provided in this embodiment is different from the above embodiments in the structure of the waterproof and breathable assembly. Specifically, the inner end surface of the air-permeable ram 420 is provided with a connection tip 427 in a protruding manner, the first air-permeable hole 424 extends along the protruding direction of the connection tip 427 and penetrates through the connection tip 427, and when the air-permeable ram 420 is installed in the second hole portion 332, the connection tip 427 is inserted into the first hole portion 331 and is screwed with the first hole portion 331.

In this embodiment, the first air guide hole 424 extends along the protruding direction of the connection terminal 427 and penetrates through the connection terminal 427, and the first air guide hole 424, the accommodating cavity 423 and the second air guide hole 425 together form a ventilation channel for exchanging air between the motor cavity 320 and the external environment, so as to achieve air exchange between the motor cavity 320 and the external environment. The first hole portion 331 is provided with an internal thread, the connection end 427 is correspondingly provided with an external thread, when the ventilating press head 420 is installed, the connection end 427 is aligned with the first hole portion 331 and screwed into the first hole portion 331, and the internal thread of the first hole portion 331 is in threaded connection with the external thread on the connection end 427, so that the ventilating press head 420 can be reliably and stably installed.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, rearrangements and substitutions will now occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement or improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. The utility model provides a wheel hub motor, includes motor shaft (100), stator (200) and rotor (300), stator (200) fixed cover is located on motor shaft (100), rotor (300) rotationally overlap and locate on motor shaft (100), rotor (300) include motor casing (310), motor cavity (320) have been seted up in motor casing (310), stator (200) set up in the motor cavity, set up on motor shaft (100) with through wires hole (110) of motor cavity intercommunication, outside cable (600) are worn to locate through wires hole (110) get into in motor cavity (320), its characterized in that, set up on motor casing (310) with bleeder vent (330) of motor cavity (320) intercommunication, install waterproof ventilative subassembly (400) in bleeder vent (330), set up on motor shaft (100) with through wires hole (120) of injecting glue hole (110) intercommunication.

2. The in-wheel motor according to claim 1, wherein the vent hole (330) comprises a first hole portion (331) and a second hole portion (332) which are arranged in a stepped manner, the first hole portion (331) is arranged towards the motor cavity (320), the hole diameter of the first hole portion (331) is smaller than that of the second hole portion (332), the waterproof and breathable assembly (400) comprises a waterproof and breathable film (410) and a breathable press head (420), the waterproof and breathable film (410) is positioned in the second hole portion (332) and covers the first hole portion (331), the breathable press head (420) is positioned in the second hole portion (332), and a breathable structure is arranged on the breathable press head (420) in a penetrating manner.

3. The in-wheel motor according to claim 2, characterized in that the air permeable structure is provided as an air permeable groove (421), and the air permeable groove (421) is communicated with and extends from the inner end face of the air permeable pressure head (420) to the outer end face of the air permeable pressure head (420).

4. The electric in-wheel motor according to claim 3, characterized in that the ventilation slot (421) comprises a first slot portion (4211) and a second slot portion (4212), the first slot portion (4211) is arranged on the inner end surface of the ventilation ram (420), the second slot portion (4212) is arranged on the side end surface of the ventilation ram (420), the first slot portion (4211) extends from the middle of the inner end surface of the ventilation ram (420) to the edge of the inner end surface of the ventilation ram (420), the first end of the second slot portion (4212) is communicated with the end of the first slot portion (4211) located on the edge of the inner end surface of the ventilation ram (420), and the second end of the second slot portion (4212) extends to the outer end surface of the ventilation ram (420).

5. The in-wheel motor according to claim 4, characterized in that a plurality of the first groove portions (4211) and the second groove portions (4212) are correspondingly arranged, and the inner end surface of the air-permeable pressure head (420) is further provided with a communication groove (422) communicated with the plurality of the first groove portions (4211).

6. The in-wheel motor according to claim 2, wherein the air-permeable pressure head (420) is provided with a containing cavity (423), the containing cavity (423) is provided with a first air-guide hole (424) communicated with an inner end face of the air-permeable pressure head (420) and a second air-guide hole (425) communicated with an outer end face of the air-permeable pressure head (420), the containing cavity (423), the first air-guide hole (424) and the second air-guide hole (425) jointly form the air-permeable structure, and the waterproof air-permeable membrane (410) is arranged in the containing cavity (423) and covers the first air-guide hole (424).

7. The in-wheel motor as claimed in claim 6, wherein a snap joint (426) is convexly provided on an inner end surface of the air-permeable pressure head (420), and when the air-permeable pressure head (420) is installed in the second hole portion (332), the snap joint (426) penetrates through the first hole portion (331) and is snapped with an inner end wall of the motor cavity (320).

8. The in-wheel motor as claimed in claim 6, wherein the inner end surface of the air-permeable ram (420) is provided with a connection terminal (427) in a protruding manner, the first air-permeable holes (424) extend along the protruding direction of the connection terminal (427) and penetrate through the connection terminal (427), and when the air-permeable ram (420) is installed in the second hole portion (332), the connection terminal (427) penetrates through the first hole portion (331) and is screwed with the first hole portion (331).

9. The in-wheel motor according to any one of claims 1-8, wherein a sealing sleeve (510) is arranged in the threading hole (110), the external cable (600) is arranged in the sealing sleeve (510) in a penetrating manner and enters the motor cavity (320), and the sealing sleeve (510) is used for sealing a gap between the external cable (600) and the threading hole (110).

10. An in-wheel motor according to claim 9, characterized in that the outer surface of the sealing sleeve (510) is further provided with a plurality of sealing teeth (511).