Electric tool with copper terminal rubber-coated circuit

Abstract

The utility model discloses an electric tool with a copper terminal rubber coating circuit, which comprises a copper sheet comprising a rubber coating part and a wire hanging part which are connected with each other; the protruding block is arranged on one side of the rubber coating part in a protruding mode, and an annular gap is reserved between the peripheral contour of the protruding block and the peripheral contour of the rubber coating part. The bakelite seat and the copper sheet are integrally formed through in-mold injection molding, and an annular groove corresponding to the annular gap is formed; a stator; and a rotor. The copper sheet is placed in the cavity of the forming mold of the bakelite base, the convex block, the rubber coating part and the in-mold cavity are utilized to form the rubber injection channel, plastic flows along the annular gap, the resistance of the annular gap is smaller, the situation of incomplete coating is reduced, the fixing stability of the copper sheet is improved, and the service life of the copper sheet is prolonged. And on the other hand, the peripheral contour of the bump deviates inwards relative to the peripheral contour of the rubber coating part, so that the width of the copper sheet in the transverse direction is reduced, the occupied space of a single copper sheet is reduced, and the design trend of a compact space is met.

Description

Technical Field

[0001] The utility model relates to the technical field of electric tools, in particular to an electric tool with a copper terminal rubber-coated circuit. Background Art

[0002] Power tools are mainly divided into metal cutting power tools, grinding power tools, assembly power tools and railway power tools. Common power tools include electric drills, electric grinders, electric wrenches and electric screwdrivers, electric hammers and impact drills, concrete vibrators, and electric planers.

[0003] In the prior art, the conductive terminal is integrally formed with the bakelite base through injection molding. Specifically, a claw piece with a certain angle is extended outward from the side of the copper sheet, and the claw piece is fixed by injection molding. This structure has the following disadvantages: since the copper sheet is a sheet structure with a relatively small size, and the claw piece forms a certain angle with it, leaving a tiny angle gap, when the bakelite base is injection molded, it is easy for the plastic to be unable to pass through the angle gap, resulting in the inability to completely fill the angle gap, thus affecting stability. On the other hand, the bent claw piece will increase the width of the copper sheet in the lateral direction, which does not conform to the design trend of compact space. Utility Model Content

[0004] In order to overcome the shortcomings and deficiencies in the prior art, the utility model aims to provide an electric tool with a copper terminal rubber-coated circuit.

[0005] To achieve the above purpose, the technical solution of the utility model is as follows:

[0006] An electric tool with a copper terminal rubber-coated circuit, comprising:

[0007] Copper sheet, including a connected rubber-coated portion and a wire-hanging portion;

[0008] A convex block is convexly arranged on one side of the rubber-coated portion, and an annular gap is left between the outer peripheral contour and the outer peripheral contour of the rubber-coated portion;

[0009] A bakelite seat is integrally formed with the copper sheet by in-mold injection molding, and forms an annular groove corresponding to the annular gap, wherein the annular groove can wrap the protrusion;

[0010] The stator is provided with a coil, the bakelite seat is arranged on the stator, and one end of the coil is fixed on the wire hanging part;

[0011] The rotor is provided with a rotating shaft which coaxially passes through the stator, and a working component is detachably mounted on one end of the rotating shaft.

[0012] Preferably, the cross section of the protrusion is dovetail-shaped, and the short side of the protrusion is connected to the rubber-coated portion.

[0013] Preferably, first notches are respectively provided inwardly on both sides of the protrusion.

[0014] Preferably, a second notch is formed in the middle of the protrusion and passes through two sides.

[0015] Preferably, the second notch is a dovetail-shaped notch with its short side facing the bakelite seat.

[0016] Preferably, the depth of the second notch is 0.6 to 0.7 times the thickness of the bump.

[0017] Preferably, it also includes:

[0018] A hollow shell, wherein the stator is coaxially fixed in the hollow shell;

[0019] An electric control board is arranged in the hollow shell, and an assembly hole for fixing the electric wire is opened at one end of the copper sheet away from the wire hanging part, and the other end of the electric wire is connected to the electric control board;

[0020] The first bearing is coaxially arranged at the rear end of the hollow housing and sleeved on the shaft of the rotor.

[0021] Preferably, a rear end portion of the hollow shell is provided with a rear end cover, and the rear end cover is coaxially provided with an assembly cylinder, and the outer ring of the first bearing is integrally formed with the rear end cover through the assembly cylinder.

[0022] Preferably, the stator includes an iron core and a winding frame, the iron core and the bakelite seat with the copper sheet are integrally formed with the winding frame by in-mold injection molding, the bakelite seat is arranged on the outer side of the winding frame, and the winding frame is provided with a plurality of barbs for fixing the coil at one end close to the wire hanging part.

[0023] Preferably, it further comprises a transmission assembly, which is arranged at the front end of the hollow shell, and the working component is transmission-connected to the rotor via the transmission assembly.

[0024] The beneficial effect of the utility model is that the copper sheet is placed in the cavity of the forming mold of the bakelite seat, and the projection, the rubber-coated part and the cavity in the mold are used to form a glue injection channel. The plastic flows along the annular gap to form an annular groove for including the projection. The annular groove acts on the projection to achieve the purpose of fixation. Compared with the angle gap in the prior art, the resistance of the annular gap is smaller, thereby reducing the occurrence of incomplete wrapping, which is beneficial to improving the stability of the copper sheet fixation. On the other hand, the outer peripheral contour of the projection is offset inwardly with the outer peripheral contour of the rubber-coated part, which is beneficial to reducing the width of the copper sheet in the lateral direction, thereby reducing the space occupied by a single copper sheet, which is beneficial to meeting the design trend of compact space. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1This is an axonometric view of a copper sheet according to an embodiment of the present invention;

[0026] Figure 2 It is a rear view of the copper sheet of the embodiment of the utility model;

[0027] Figure 3 It is a structural schematic diagram of the stator and rotor of an embodiment of the utility model;

[0028] Figure 4 It is a schematic longitudinal section diagram of the electric working of an embodiment of the utility model.

[0029] As shown in the figure:

[0030] 1-copper sheet, 11-rubber coating part, 111-bump, 1111-first notch, 1112-second notch, 112-annular gap, 12-wire hanging part, 13-assembly hole;

[0031] 2- Bakelite seat;

[0032] 3-stator, 31-iron core, 32-winding frame, 321-barb;

[0033] 4-rotor, 41-rotating shaft;

[0034] 5-hollow housing, 51-electric control board, 52-assembly cylinder, 521-first bearing, 53-transmission assembly, 54-working part. DETAILED DESCRIPTION

[0035] The following is a detailed explanation of the implementation of the present invention in conjunction with the accompanying drawings. The accompanying drawings are for reference and illustration only and do not constitute a limitation on the scope of patent protection of the present invention.

[0036] See also Figure 1-Figure 4 In this embodiment, an electric tool having a copper terminal rubber-coated circuit includes:

[0037] The copper sheet 1 comprises a connected rubber-coated portion 11 and a wire-hanging portion 12;

[0038] A convex block 111 is convexly disposed on one side of the rubber-coated portion 11 , and an annular gap 112 is left between the outer periphery of the convex block 111 and the outer periphery of the rubber-coated portion 11 ;

[0039] The bakelite seat 2 is integrally formed with the copper sheet 1 by in-mold injection molding, and forms an annular groove corresponding to the annular gap 112, and the annular groove can wrap the protrusion 111;

[0040] The stator 3 is provided with a coil, the bakelite seat 2 is arranged on the stator 3, and one end of the coil is fixed on the wire hanging part 12;

[0041] The rotor 4 is provided with a rotating shaft 41 coaxially penetrating the stator 3 , and a working component 54 is detachably mounted on one end of the rotating shaft 41 .

[0042] In this embodiment, there are three copper sheets 1, which are arranged in the length direction of the bakelite base 2. The wire hanging part 12 is a hook integrally formed on the side of the copper sheet 1 away from the protrusion 111, and the angle between the hook and the copper sheet 1 is 15-20 degrees, which is conducive to improving the fixing effect of the coil.

[0043] Preferably, the cross section of the protrusion 111 is dovetail-shaped, and the short side of the protrusion 111 is connected to the rubber-coated portion 11 .

[0044] In this embodiment, the dovetail-shaped protrusion 111 is used to form an annular groove with a reverse slope, so as to further enhance the stability of the copper sheet 1 and the bakelite seat 2 in the radial direction.

[0045] Preferably, first notches 1111 are respectively formed inwardly on both sides of the protrusion 111 .

[0046] In this embodiment, the first notch 1111 is an arc-shaped notch opened along the length direction of the protrusion 111, which is beneficial to increase the contact surface between the protrusion 111 and the bakelite seat 2 and further enhance the stability of the copper sheet 1 and the bakelite seat 2 in the radial direction.

[0047] Preferably, a second notch 1112 is formed in the middle of the protrusion 111 and passes through two sides.

[0048] In this embodiment, the second notch 1112 is used to add glue in the middle of the protrusion 111 , further enhancing the stability of the copper sheet 1 and the bakelite seat 2 in the axial direction.

[0049] Preferably, the second notch 1112 is a dovetail-shaped notch with its short side facing the bakelite seat 2 .

[0050] In this embodiment, the aforementioned glue addition has a reverse slope by utilizing a dovetail notch, which further improves the assembly stability of the copper sheet 1 and prevents it from falling off when the coil and the wire hanging portion 12 are butt-welded.

[0051] Preferably, the depth of the second notch 1112 is 0.6 to 0.7 times the thickness of the bump 111 .

[0052] In this embodiment, the depth of the second notch 1112 is 0.65 times the thickness of the bump 111 , and the strength of the glue is ensured by a reasonable thickness dimension.

[0053] Preferably, it also includes:

[0054] A hollow shell 5, wherein the stator 3 is coaxially fixed in the hollow shell 5;

[0055] The electric control board 51 is arranged in the hollow shell 5. The copper sheet 1 is provided with an assembly hole 13 for fixing the electric wire at one end away from the wire hanging part 12. The other end of the electric wire is connected to the electric control board 51.

[0056] The first bearing 521 is coaxially disposed at the rear end of the hollow housing 5 and sleeved on the shaft of the rotor 4 .

[0057] Preferably, a rear end cover is provided at the rear end of the hollow housing 5, and the rear end cover is coaxially provided with an assembly tube 52, and the outer ring of the first bearing 521 is integrally formed with the rear end cover through the assembly tube 52. By using the above technical solution, the retaining spring for fixing the first bearing 521 can be omitted, thereby reducing the axial size of the power tool.

[0058] Preferably, the stator 3 includes an iron core 31 and a winding frame 32, the iron core 31 and the bakelite seat 2 with the copper sheet 1 are integrally formed with the winding frame 32 by in-mold injection molding, the bakelite seat 2 is arranged on the outer side of the winding frame, and the winding frame 32 is provided with a plurality of barbs 321 for fixing the coil at one end close to the wire hanging portion 12. The working principle of the electron and the rotor 4 is a well-known technical common sense in the art, so the working principle is not described in detail in this embodiment.

[0059] Preferably, it further comprises a transmission assembly 53 , which is disposed at the front end of the hollow shell 5 , and the working component 54 is transmission-connected to the rotor 4 via the transmission assembly 53 .

[0060] In this embodiment, a transmission gear set is provided in the transmission assembly 53 for realizing transmission between the rotating shaft 41 and the working part 54; other structures and operations of the electric tool are understandable and easy to implement for those skilled in the art, so this embodiment will not be described in detail.

[0061] The above disclosure is only a preferred embodiment of the present invention, which cannot be used to limit the scope of protection of the present invention. Therefore, equivalent changes made within the scope of the patent application of the present invention are still within the scope covered by the present invention.

Claims

1. An electric tool with a copper terminal rubber-coated circuit, characterized in that: include: Copper sheet, including a connected rubber-coated portion and a wire-hanging portion; A convex block is convexly arranged on one side of the rubber-coated portion, and an annular gap is left between the outer peripheral contour and the outer peripheral contour of the rubber-coated portion; A bakelite seat is integrally formed with the copper sheet by in-mold injection molding, and forms an annular groove corresponding to the annular gap, wherein the annular groove can wrap the protrusion; The stator is provided with a coil, the bakelite seat is arranged on the stator, and one end of the coil is fixed on the wire hanging part; The rotor is provided with a rotating shaft which coaxially passes through the stator, and a working component is detachably mounted on one end of the rotating shaft.

2. The electric tool with a copper terminal rubber-coated circuit according to claim 1, characterized in that: The cross section of the protrusion is dovetail-shaped, and the short side of the protrusion is connected to the rubber-encapsulated portion.

3. The electric tool with a copper terminal rubber-coated circuit according to claim 2, characterized in that: The two sides of the protrusion are respectively provided with first notches inwardly concavely.

4. The electric tool with a copper terminal rubber-coated circuit according to claim 2, characterized in that: A second notch is formed in the middle of the protrusion and passes through two sides.

5. The electric tool with a copper terminal rubber-coated circuit according to claim 4, characterized in that: The second notch is a dovetail-shaped notch with a short side facing the bakelite seat.

6. An electric tool with a copper terminal rubber-coated circuit according to any one of claims 4 or 5, characterized in that: The depth of the second notch is 0.6 to 0.7 times the thickness of the bump.

7. The electric tool with a copper terminal rubber-coated circuit according to claim 1, characterized in that: Also includes: A hollow shell, wherein the stator is coaxially fixed in the hollow shell; An electric control board is arranged in the hollow shell, and an assembly hole for fixing the electric wire is opened at one end of the copper sheet away from the wire hanging part, and the other end of the electric wire is connected to the electric control board; The first bearing is coaxially arranged at the rear end of the hollow housing and sleeved on the shaft of the rotor.

8. The electric tool with a copper terminal rubber-coated circuit according to claim 7, characterized in that: A rear end cover is provided at the rear end of the hollow housing, and an assembly cylinder is coaxially provided on the rear end cover. The outer ring of the first bearing is integrally formed with the rear end cover through the assembly cylinder.

9. The electric tool with a copper terminal rubber-coated circuit according to claim 7, characterized in that: The stator comprises an iron core and a winding frame. The iron core and the bakelite seat with the copper sheet are integrally formed with the winding frame by in-mold injection molding. The bakelite seat is arranged on the outer side of the winding frame. The winding frame is provided with a plurality of barbs for fixing the coil at one end close to the wire hanging part.

10. The electric tool with a copper terminal rubber-coated circuit according to claim 7, characterized in that: It also includes a transmission assembly, which is arranged at the front end of the hollow shell, and the working component is connected to the rotor through the transmission assembly.

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