CN217159443U

CN217159443U - Electric drive

Info

Publication number: CN217159443U
Application number: CN202220526441.5U
Authority: CN
Inventors: 王鹏; 张自立
Original assignee: Bosch Power Tools China Co Ltd
Current assignee: Bosch Power Tools China Co Ltd
Priority date: 2022-03-11
Filing date: 2022-03-11
Publication date: 2022-08-09
Anticipated expiration: 2032-03-11

Abstract

The present application provides an electric drive. The electric drive comprises: a housing having an end; a rotor and a stator disposed within the housing; at least one electrical terminal projecting from the end portion and extending a first predetermined length and having a root portion proximate the end portion and a distal end distal from the end portion; at least one step extending from the end at the root of each electrical terminal, extending a second predetermined length along the electrical terminal, and surrounding at least a portion of the electrical terminal; at least one wire electrically connected to and extending from each of the electrical terminals, respectively; and a heat shrink tube sleeved over the at least one step, the at least one electrical terminal, and the at least one wire and extending from the end along the at least one step, the at least one electrical terminal, and the at least one wire by a third predetermined length. The electric driver has the advantages of simple structure, convenience in implementation, convenience in manufacturing and the like.

Description

Electric drive

Technical Field

The present application relates to the field of electric drive structures. More particularly, the present application relates to an electrical driver that aims to provide improved electrical terminal packaging capabilities.

Background

The stator and the rotor of an electric drive usually need to be energized and are therefore usually provided with electrical terminals. The wire may be attached to the terminal by soldering, and the heat shrink tube may be sleeved to the terminal and the wire. To ensure sealing performance, silicone is typically applied after the heat shrink tubing is sleeved. The silica gel is typically applied manually by an operator and is applied in a fluid or semi-fluid manner. After application, the silicone gel typically cures after several hours and forms a protection for the terminal root.

SUMMERY OF THE UTILITY MODEL

It is an object of an aspect of the present application to provide an electric drive which aims at providing improved terminal protection and processing capabilities.

The purpose of the application is realized by the following technical scheme:

an electric drive comprising:

a housing having an end;

a rotor and a stator disposed within the housing;

at least one electrical terminal projecting from the end portion and extending a first predetermined length and having a root portion proximate the end portion and a distal end distal from the end portion;

at least one step extending from the end at the root of each electrical terminal, extending a second predetermined length along the electrical terminal, and surrounding at least a portion of the electrical terminal; and

at least one wire electrically connected to and extending from each of the electrical terminals, respectively; and

a heat shrink tubing sleeved over the at least one step, the at least one electrical terminal, and the at least one wire and extending from the end along the at least one step, the at least one electrical terminal, and the at least one wire for a third predetermined length.

In the above electric drive, optionally, the first predetermined length is greater than the second predetermined length.

In the above electric drive, optionally, the third predetermined length is greater than the second predetermined length, and the third predetermined length is greater than the first predetermined length.

In the above electric driver, optionally, the heat shrinkable tube is attached on the outer surfaces of the electric terminals, the steps, and the wires via a heat shrinking process.

In the above electric driver, optionally, the at least one electric terminal includes a U terminal, a V terminal, a W terminal, and a center point terminal.

In the above electric driver, optionally, the at least one step includes a U terminal step, a V terminal step, a W terminal step, and a center point terminal step.

In the above electric drive, optionally, the housing has a cylindrical shape, the end portion has an annular contour, and the respective electric terminals are uniformly distributed along the annular contour.

In the above electric driver, optionally, the housing extends in the axial direction, and the respective electric terminals extend out in the axial direction.

In the above electric drive, optionally, the electric drive is a brushless motor.

In the above electric drive, optionally, the at least one step comprises a protrusion extending in a radial direction.

Drawings

The present application will now be described in further detail with reference to the accompanying drawings and preferred embodiments. Those skilled in the art will appreciate that the drawings are designed solely for the purposes of illustrating preferred embodiments and that, accordingly, should not be taken as limiting the scope of the present application. Furthermore, unless specifically stated otherwise, the drawings are intended to be conceptual in nature or configuration of the depicted objects and may contain exaggerated displays. The figures are also not necessarily drawn to scale.

FIG. 1 is a perspective view of one embodiment of an electric drive of the present application.

Fig. 2 is a partially enlarged view of fig. 1.

FIG. 3 is a perspective view of the embodiment of FIG. 1 after installation of the heat shrinkable tube.

Detailed Description

Hereinafter, preferred embodiments of the present application will be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that the descriptions are illustrative only, exemplary, and should not be construed as limiting the scope of the application.

First, it should be noted that the terms top, bottom, upward, downward, and the like as used herein are defined with respect to the orientation in the drawings. These orientations are relative concepts and will therefore vary depending on the position and state in which they are located. These and other directional terms are not to be construed in a limiting sense.

Furthermore, it should also be noted that for any single technical feature described or implicit in the embodiments herein or shown or implicit in the drawings, these technical features (or their equivalents) can be continuously combined to obtain other embodiments not directly mentioned herein.

It should be noted that in different drawings, the same reference numerals indicate the same or substantially the same components.

FIG. 1 is a perspective view of one embodiment of an electric drive of the present application. The electric drive includes a housing 110. The housing 110 may be configured to be generally cylindrical and have an axial direction. The housing 110 may also have an end 111. For example, the end 111 may be disposed at one end of the housing 110 and may have a generally annular profile. For example, the cross-section of the housing 110 may also be configured to have a generally annular profile that generally conforms to the annular profile of the end 111.

Although not shown, it is readily understood that a rotor and a stator may be housed within the housing 110 and provide the basic functions of an electric drive. In one embodiment, the electric drive is a brushless motor. In another embodiment, the electric drive uses three-phase alternating current. The rotor and stator need to be selectively energized to provide rotational capability.

One or more electrical terminals may be provided on the end 111. Each electrical terminal may be electrically connected to the rotor or the stator. In one embodiment, each electrical terminal extends from end 111 generally in an axial direction. The electrical terminals may include a proximal end proximate to the end 111 and a distal end distal from the end 111, respectively, and have a first extended length therebetween. In one embodiment, the electrical terminals may be made of an electrically conductive material. For example, the electrical terminals may be made of copper, iron, silver, or other suitable electrically conductive material.

The step may extend from the end 111, extend a second extension length along the length of the electrical terminal, and surround at least a portion of the electrical terminal. For example, the proximal end of the electrical terminal may be completely surrounded by the step and thus not visible. The step may be configured to be integral with the end 111 and may be made of an insulating material. For example, the step may be made of epoxy and integrally molded with the end 111. In the illustrated embodiment, the step extends a second extension length along the electrical terminal. It is readily understood that the second extension length may be configured to be less than the first extension length.

The embodiment shown in fig. 1 provides a plurality of electrical terminals including a U terminal 121, a V terminal 122, a W terminal 123, and a center point terminal 124. The terminals together provide three-phase electrical access capability to the electric drive. Similarly, the embodiment of fig. 1 also provides a plurality of steps including a U terminal step 131, a V terminal step 132, a W terminal step 133, and a center point terminal step 134. Each step is matched with each terminal, respectively, and each step may have a substantially equal second extension length.

Although the present solution is illustrated in fig. 1 in connection with an embodiment of a three-phase motor, it is readily understood that the present solution is not limited to the illustrated embodiment. For example, the end portion 111 may be arranged with more or less electric terminals, and the electric terminals do not necessarily extend in the axial direction but may extend in other directions.

Fig. 2 is a partially enlarged view of fig. 1. As shown in fig. 2, the V terminal 122 may include a through hole 122 a. The V-terminal step 132 may be configured to have a substantially truncated pyramid shape, and may further include a protrusion 132a extending in a radial direction. The protrusion 132a protrudes from the side of the V terminal 122 away from the V terminal 122, and may also have a substantially truncated pyramid shape.

Although fig. 2 shows the configuration of the electrical terminals and steps with the V-terminal 122 as an example, it is readily understood that other electrical terminals and steps may have a substantially similar configuration or differ slightly in detail. For example, some electrical terminals may not have through-holes, and some steps may have other cross-sectional shapes including, but not limited to, circular, oval, rectangular, triangular, and the like. Some steps may have other overall shapes including, but not limited to, cylindrical, frustoconical, etc. The configuration of the projections aids in positioning the heat shrink tubing as described in detail below and facilitates the heat shrinking operation.

FIG. 3 is a perspective view of the embodiment of FIG. 1 after installation of the heat shrinkable tube. As shown in fig. 3, the wires 140 may be electrically connected to electrical terminals. For example, the lead 140 may be electrically connected to the electrical terminal by soldering. The heat shrink tubing 150 may be sleeved over the step, the electrical terminal and the wire 140, and one end of the heat shrink tubing 150 is positioned near the end 111, while the other end extends a third extension length along the step, the electrical terminal and the wire 140. In one embodiment, the third extension length is greater than the first extension length and also greater than the second extension length. Thus, the heat shrinkage tube 150 completely accommodates the step and the electric terminal therein.

After the sleeving, the heat shrink tubing 150 may be machined and subjected to heat shrinking such that the heat shrink tubing 150 shrinks in size and attaches over the steps, the electrical terminals and the wires 140 such that the electrical terminals and the conductive portions of the wires 140 are not visible in fig. 3. The heat shrinkage tube 150 may be made of an insulating material, and thus provides further insulating properties to the electrical terminal.

It is easily understood that the above-mentioned electric terminals may include the U terminal 121, the V terminal 122, the W terminal 123, and the center point terminal 124, and the above-mentioned steps may include the U terminal step 131, the V terminal step 132, the W terminal step 133, and the center point terminal step 134.

The electric driver has the advantages of simple structure, reliable operation, easy implementation and the like. By adopting the scheme of the application, the manufacturing cost of the electric driver is reduced, and the reliability is improved.

This written description discloses the application with reference to the drawings, and also enables one skilled in the art to practice the application, including making and using any devices or systems, selecting appropriate materials, and using any incorporated methods. The scope of the present application is defined by the claims and encompasses other examples that occur to those skilled in the art. Such other examples are to be considered within the scope of protection defined by the claims of this application, provided that they include structural elements that do not differ from the literal language of the claims, or that they include equivalent structural elements with insubstantial differences from the literal language of the claims.

Claims

1. An electric drive, characterized by comprising:

a housing (110) having an end (111);

a rotor and a stator disposed within the housing (110);

at least one electrical terminal projecting from said end (111) and extending a first predetermined length and having a root proximal to said end (111) and a distal end distal from said end (111);

at least one step extending from the end (111) at a root of each electrical terminal, extending a second predetermined length along the electrical terminal, and surrounding at least a portion of the electrical terminal;

at least one wire (140) electrically connected to and extending from each of the electrical terminals, respectively; and

a heat shrink tubing (150) sleeved over the at least one step, the at least one electrical terminal, and the at least one wire (140) and extending from the end (111) along the at least one step, the at least one electrical terminal, and the at least one wire (140) for a third predetermined length.

2. The electric drive of claim 1 wherein the first predetermined length is greater than the second predetermined length.

3. The electric drive of claim 1 wherein the third predetermined length is greater than the second predetermined length and the third predetermined length is greater than the first predetermined length.

4. The electrical driver of claim 1, wherein the heat shrink tubing (150) is attached on the electrical terminals, the step, and an outer surface of the wire (140) via a heat shrink process.

5. Electric drive according to claim 1, characterized in that the at least one electric terminal comprises a U terminal (121), a V terminal (122), a W terminal (123) and a center point terminal (124).

6. The electric drive of claim 5 wherein the at least one step includes a U terminal step (131), a V terminal step (132), a W terminal step (133), and a center point terminal step (134).

7. Electrical drive according to any of claims 1-6, characterized in that the housing (110) has a cylindrical shape, the end portion (111) has an annular contour, and the individual electrical terminals are evenly distributed along the annular contour.

8. The electric drive according to claim 7, characterized in that the housing (110) extends in an axial direction and the respective electric terminals extend in the axial direction.

9. Electric drive according to any of claims 1-6, characterized in that the electric drive is a brushless motor.

10. The electric drive according to any of claims 1-6, characterized in that the at least one step comprises a protrusion (132a) extending in a radial direction.