CN214337699U

CN214337699U - Electric machine

Info

Publication number: CN214337699U
Application number: CN202120330473.3U
Authority: CN
Inventors: 刘凡华; 晁衡
Original assignee: Bosch Automotive Products Changsha Co Ltd
Current assignee: Bosch Automotive Products Suzhou Co Ltd
Priority date: 2021-02-05
Filing date: 2021-02-05
Publication date: 2021-10-01
Anticipated expiration: 2031-02-05

Abstract

The present application provides an electric machine. Wherein, a channel is arranged on the main shaft, and a first fixing part is arranged in the channel. The cable extends from the lumen through the passage to outside the housing. The sealing member includes a body portion and a sealing portion. The sealing part is fixed on the body part. The body portion is made of a rigid material, the sealing portion is made of an elastic material, and the cable passes through the sealing member. The body part is provided with a second fixing part which is arranged in the channel and is occluded with the first fixing part for fixing. The seal is resiliently compressed between the cable and the passage to form a seal. The technical scheme is easy to install and reliable in sealing performance.

Description

Electric machine

Technical Field

The present application relates to electrical machines, and more particularly to electrical machines with sealing provisions.

Background

In-wheel motors mounted in wheels are widely used in electric bicycles and electric scooters, and since the wheels may be exposed to severe environments such as muddy water, the motors need to provide a good seal to prevent the interior of the motors from being contaminated or submerged.

The cable connected with the external power supply and the controller passes through a channel in the motor spindle to be electrically connected with the stator in the inner cavity of the motor. The cable is typically a clearance fit with the passage so that the cable can easily pass through the passage. As shown in fig. 7, the gap between the adhesive cable 72 and the channel 74 is filled with glue 70, thereby sealing the motor. However, with aging, the sealing properties of the motor will be greatly reduced.

SUMMERY OF THE UTILITY MODEL

The motor sealing effect that exists among the prior art is poor technical problem mainly solved in this application.

In order to solve the above technical problem, the present application provides a motor, which includes:

the main shaft is provided with a channel, and a first fixing part is arranged in the channel;

a housing relatively rotatably mounted to the spindle, an inner cavity being formed in the housing;

a cable extending from the lumen through the passage and out of the housing;

a seal comprising a body portion and a sealing portion, the sealing portion being secured to the body portion, the body portion being made of a rigid material, the sealing portion being made of an elastic material, the cable passing through the seal, the body portion having a second securing portion which fits into the channel and is secured in engagement with the first securing portion, the sealing portion being elastically compressed between the cable and the channel to form a seal.

In some embodiments, the housing has a rim at an outer periphery thereof, the body portion is made of plastic, and the sealing portion is made of rubber.

In some embodiments, the body portion and the sealing portion are integrally formed by insert molding.

In some embodiments, the body portion includes a cylindrical base portion, a plurality of resilient arms cantilevered from an axial end of the base portion, and the second securing portion is located at a free end of the resilient arms.

In some embodiments, the base is provided with a recess, the recess being embedded in the sealing portion.

In some embodiments, the recess comprises a plurality of small holes through a peripheral wall of the base.

In some embodiments, the second fixing portion is located at a front end of the sealing member, the sealing portion is located at a rear end of the sealing member, the sealing portion has an outer circumferential surface, a diameter of the outer circumferential surface is gradually changed from the front end to the rear end, the diameter of the front end of the outer circumferential surface is smaller than that of the rear end of the outer circumferential surface, and the outer circumferential surface is pressed by the channel to be elastically deformed.

In some embodiments, the second fixing portion is located at a front end of the sealing member, the sealing portion is located at a rear end of the sealing member, the sealing portion has an inner circumferential surface, a diameter of the inner circumferential surface is gradually changed from the front end to the rear end, the diameter of the front end of the inner circumferential surface is larger than the diameter of the rear end of the inner circumferential surface and the diameter of the cable, and elastic compression deformation exists between the cable and the rear end of the inner circumferential surface.

In some embodiments, the passage passes through an axial end of the main shaft, the first securing portion includes a recess formed in the passage, and the second securing portion includes a protrusion formed on an outer periphery of the body portion, the protrusion snapping into the recess.

In some embodiments, the diameter of the rear end of the outer peripheral surface is larger than the diameter of the channel in a natural state.

According to an aspect of the present application, the sealing member is fixed by the engagement of the second fixing portion of the body portion with the first fixing portion of the passage, and the elastic sealing portion is elastically compressed between the cable and the passage to form a seal. The technical scheme is easy to install and reliable in sealing performance.

Drawings

Specific embodiments of the present application are described in detail below with reference to the attached drawing figures, wherein:

FIG. 1 shows a schematic diagram of an embodiment of an electric machine;

FIG. 2 shows a schematic view of one embodiment of a seal;

FIG. 3 shows a schematic cross-sectional view of the seal of FIG. 2;

FIG. 4 shows a schematic view of the body portion of the seal of FIG. 2;

FIG. 5 is an enlarged partial schematic view of an exemplary embodiment of a motor with a seal installed;

FIG. 6 shows a schematic view of the seal of FIG. 5 when it is fully installed;

fig. 7 is a partially enlarged view showing a sealing portion of a conventional motor.

Detailed Description

Referring to fig. 1 to 6, a motor 100 according to an embodiment of the present invention includes a main shaft 1, a housing 2, a cable 3, and a sealing member 6. The housing 2 is relatively rotatably mounted to the main shaft 1. For example, the housing 2 is supported by the main shaft 1 via a ball bearing (not shown). The outer periphery of the housing 2 has a rim 20 for mounting a tire. An inner cavity (not shown) is formed in the housing 2. A stator and a rotor (not shown) of the motor are mounted in an inner cavity of the housing 2, the stator is fixed to the main shaft 1, and the rotor is fixed to the housing 2. When energized by the cable 3, the stator and rotor produce relative rotation according to the electromagnetic effect, thereby driving the housing 2 in rotation relative to the spindle 1.

A passage 12 is provided in the spindle 1, and the cable 3 extends from the interior of the housing 2 through the passage 12 to the outside of the housing 2. The cable 3 typically includes a plurality of insulated conductors for electrically connecting components such as a power supply and a controller external to the motor. The channel 12 extends through the axial end of the spindle 1, whereby the axial end of the spindle 1 forms an opening. A nail fixing portion 10 is provided in the passage 12, the nail fixing portion 10 including a recess formed in the passage 12. For example, as shown in fig. 5, the groove is an annular groove recessed in the inner peripheral wall of the passage 12, and is spaced apart from the axial end of the main shaft 1. The diameter of the bottom of the groove is larger than the inner diameter of the channel 12 to the right of the groove.

The seal 6 includes a body portion 4 and a seal portion 5. The body portion 4 is made of a rigid material and the sealing portion 5 is made of an elastic material. The seal portion 5 is fixed to the body portion 4. Those skilled in the art will appreciate that the material stiffness and elasticity are opposite, for example, the body portion 4 is made of plastic and the sealing portion 5 is made of rubber, and that there is a significant difference between the stiffness and elasticity of the two materials. The body portion 4 and the sealing portion 5 are integrally formed by an insert molding process. The main body 4 has a second fixing portion 40. For convenience of illustration in this application, the direction in which the seal 6 is inserted into the passage at the time of assembly (as indicated by the arrow in fig. 5) is referred to as the front-rear direction. The second fixing portion 40 is located at the front end of the packing 6, and the sealing portion 5 is located at the rear end of the packing 6. For example, the body portion 4 includes a cylindrical base portion 42, and a plurality of resilient arms 44 are cantilevered forward from one axial end forward of the base portion 42. The resilient arms 44 are spaced apart from one another. Although the resilient arms 44 are integrally formed with the base 42 from the same plastic, the resilient arms 44 exhibit good resilience at the free ends due to their elongated configuration. The second fixing portion 40 is located at the free end of the resilient arm 44. The second fixing portion 40 includes a protrusion formed on the outer periphery of the body portion 4. The base portion 42 is provided with a recess 46, and the recess 46 is embedded in the seal portion 5. For example, the recess 46 includes a plurality of small holes through the peripheral wall of the base 42. When the seal portion 5 is molded, the rubber in a fluid form forming the seal portion 5 is injected into the concave portion 46. After the molding is completed, the seal portion 5 is fitted into the recess 46 in a component manner and is well joined to the body portion 4.

The sealing portion 5 has an outer peripheral surface 51, the diameter of the outer peripheral surface 51 gradually changes from the front end to the rear end, and the diameter of the front end of the outer peripheral surface 51 is smaller than the diameter of the rear end of the outer peripheral surface 51. That is, the diameter of the outer peripheral surface 51 gradually increases from the front end to the rear end of the outer peripheral surface 51. The diameter of the rear end of the outer peripheral surface 51 is larger than the diameter of the passage 12 in a natural state. As the seal 6 is inserted into the passage 12 during installation, the outer peripheral surface 51 is gradually pressed by the passage 12 to undergo greater and greater elastic deformation. The sealing portion 5 has an inner peripheral surface 52, the diameter of the inner peripheral surface 52 gradually changes from the front end to the rear end, and the diameter of the front end of the inner peripheral surface 52 is larger than the diameter of the rear end of the inner peripheral surface 52 and the diameter of the cable 3. The inner circumferential surface 52 has a diameter that gradually decreases from a front end to a rear end of the inner circumferential surface 52. When the cable 3 is fitted into the seal member 6 from the front end at the time of fitting, the inner peripheral surface 52 is gradually pressed by the cable 3. There is elastic press deformation between the cable 3 and the rear end of the inner peripheral surface 52.

When the cable 3 is installed, the second fixing portion 40 is inserted into the passage 12 and fixed to the first fixing portion 10 by engagement with the sealing member 6. After the installation is completed, the sealing portion 5 is elastically compressed between the cable 3 and the passage 12 to form a seal. The second fixing portion 40 of the elastic arm 44, the end of which protrudes outward, is snapped into the first fixing portion 10 of the inner peripheral wall of the recessed channel 12. The second fixing part 40 of the body part 4 of the sealing element 6 is meshed with and fixed to the first fixing part 10 in the channel 12, glue is not needed, the assembling time is fast, the assembling efficiency is high, and the assembling cost can be reduced. The elastic sealing part 5 is elastically compressed between the cable 3 and the channel 12 to form a seal, the material stability is greatly higher than that of the traditional glue, the seal can resist higher pressure, and the sealing performance is more reliable. Therefore, the technical scheme is easy to install and reliable in sealing performance.

Notwithstanding the foregoing, the scope of protection of the present application is defined by the claims.

Description of the reference numerals

Motor 100

Main shaft 1

Nail fixing part 10

Channel 12

Case 2

Rim 20

Cable 3

Body part 4

Second fixed part 40

Base 42

Resilient arm 44

Recess 46

Sealing part 5

Outer peripheral surface 51

Inner peripheral surface 52

Sealing element 6

Glue 70

Cable 72

Channel 74

Claims

1. An electric machine, characterized in that it comprises:

a main shaft (1), wherein a channel (12) is arranged on the main shaft (1), and a first fixing part (10) is arranged in the channel (12);

a housing (2) relatively rotatably mounted to the main shaft (1), an inner cavity being formed in the housing (2);

a cable (3) extending from the lumen through the passage (12) and out of the housing (2);

a seal (6) comprising a body portion (4) and a sealing portion (5), the sealing portion (5) being fixed to the body portion (4), the body portion (4) being made of a rigid material, the sealing portion (5) being made of an elastic material, the cable (3) passing through the seal (6), the body portion (4) having a second fixing portion (40), the second fixing portion (40) being fitted into the channel (12) to be engaged with the first fixing portion (10) for fixing, the sealing portion (5) being elastically compressed between the cable (3) and the channel (12) to form a seal.

2. The machine according to claim 1, wherein the outer periphery of the housing (2) has a rim (20), the body part (4) is made of plastic and the sealing part (5) is made of rubber.

3. The machine according to claim 1, wherein the body portion (4) and the sealing portion (5) are made in one piece by insert moulding.

4. An electric machine as claimed in claim 1, wherein the body portion (4) comprises a cylindrical base portion (42), a plurality of resilient arms (44) depending from one axial end of the base portion (42), the second fixing portion (40) being located at a free end of the resilient arms (44).

5. The electric machine according to claim 4, wherein the base (42) is provided with a recess (46), the recess (46) being embedded in the sealing portion (5).

6. The electric machine of claim 5, wherein the recess (46) comprises a plurality of small holes through a peripheral wall of the base (42).

7. The electric machine according to claim 1, wherein the second fixing portion (40) is located at a front end of the sealing member (6), the sealing portion (5) is located at a rear end of the sealing member (6), the sealing portion (5) has an outer circumferential surface (51), a diameter of the outer circumferential surface (51) is gradually changed from the front end to the rear end, the diameter of the front end of the outer circumferential surface (51) is smaller than the diameter of the rear end of the outer circumferential surface (51), and the outer circumferential surface (51) is pressed by the passage (12) to be elastically deformed.

8. The electric machine according to claim 1, wherein the second fixing portion (40) is located at a front end of the sealing member (6), the sealing portion (5) is located at a rear end of the sealing member (6), the sealing portion (5) has an inner circumferential surface (52), a diameter of the inner circumferential surface (52) is gradually changed from the front end to the rear end, the diameter of the front end of the inner circumferential surface (52) is larger than the diameter of the rear end of the inner circumferential surface (52) and the diameter of the cable (3), and elastic compression deformation exists between the cable (3) and the rear end of the inner circumferential surface (52).

9. The machine according to claim 1, wherein the channel (12) passes through an axial end of the spindle (1), the first fixing part (10) comprising a recess formed in the channel (12), the second fixing part (40) comprising a projection formed on the outer periphery of the body part (4), the projection snapping into the recess.

10. The machine according to claim 7, wherein the diameter of the rear end of the peripheral surface (51) is larger than the diameter of the channel (12) in a natural state.