CN111785547A - DC switch assembly for power tools and power tools - Google Patents

Abstract

The invention discloses a direct current switch component for an electric tool and the electric tool, the direct current switch component for the electric tool comprises: the base, push rod and main contact structure, main contact structure sets up in the base, and main contact structure includes movable contact spring, support frame, extension spring and connecting seat, and movable contact spring is connected with the support frame, and the connecting seat includes base and the connecting rod of setting on the base, and the base is connected with the support frame, and the one end and the connecting rod of extension spring are connected, and the other end and the movable contact spring of extension spring are connected, and the support frame is connected with the base, and the push rod part sets up in the base, and the part and the movable contact spring swing joint of push rod setting in the base. The direct current switch assembly for the electric tool has the advantages of being high in assembly efficiency and capable of achieving automatic assembly. Correspondingly, the invention further provides an electric tool.

Description

DC switch assembly for power tools and power tools

technical field

The invention relates to the field of electric tools, in particular to a DC switch assembly for electric tools and an electric tool.

Background technique

With the development of lithium battery technology, DC power tools have developed rapidly in recent years. Generally, the DC switch assembly of the power tool has both speed regulation and commutation functions. The DC switch assembly for the power tool includes structural components such as the main contact structure, the commutation structure, the speed regulating brush and the brake pad. In the traditional DC switch assembly for electric tools, the moving contact piece, the support frame and the tension spring of the main contact structure are respectively installed on the base, and then the tension spring is installed after the moving contact piece and the support frame are installed. Connection, due to the limited installation space of the base, it is difficult to install the tension spring, which seriously affects the assembly efficiency of the DC switch assembly, and cannot realize automatic assembly, which also affects the production efficiency of power tools to a certain extent. In addition, in the DC switch assembly for traditional power tools, the reversing contact piece often falls off from the reversing lever during the assembly process of the reversing structure, which requires repeated installation of the reversing contact piece, which also affects the DC switch assembly to a certain extent. assembly efficiency.

SUMMARY OF THE INVENTION

One object of the present invention is to provide a DC switch assembly for electric tools, which can improve the assembly efficiency of the DC switch assembly for electric tools and realize automatic assembly of the DC switch assembly for electric tools.

Another object of the present invention is to provide a power tool with high production efficiency.

For this purpose, on the one hand, the present invention adopts the following technical solutions:

A DC switch assembly for a power tool, comprising: a base, a push rod and a main contact structure, the main contact structure is arranged in the base, and the main contact structure includes a moving contact piece, a support frame, a tension spring and a connecting seat , the movable contact piece is connected with the support frame, the connection seat includes a base and a connecting rod arranged on the base, the base is connected with the support frame, and one end of the tension spring is connected to the support frame. The connecting rod is connected, the other end of the tension spring is connected with the movable contact piece, the support frame is connected with the base, the push rod is partially set in the base, and the push rod is set in the base. A part in the base is movably connected with the movable contact piece.

In one embodiment, a card slot is formed on the connecting rod, and one end part of the tension spring is accommodated in the card slot.

In one embodiment, the base is provided with a slot, and the support frame is plugged and connected to the base through the slot.

In one embodiment, the DC switch assembly for a power tool further includes a reversing mechanism, the reversing mechanism includes a reversing lever and a reversing contact piece, and an accommodating slot is opened on the reversing lever, The groove wall of the accommodating groove is provided with a protruding strip, the end of the reversing contact piece is provided with a protruding part, and the protruding part is connected to the The raised strips are snapped together.

In one embodiment, the reversing mechanism further includes a reversing connecting piece, the reversing connecting piece has an extension portion, and the extending portion is connected with the reversing contact piece.

In one embodiment, the DC switch assembly for a power tool further includes a brake pad, the brake pad includes an integrally formed connecting portion and a U-shaped contact portion, a mounting boss is provided on the push rod, and the connecting portion is The part is connected with the mounting boss.

In one of the embodiments, the connecting portion is sleeved and connected to the mounting boss, and the DC switch assembly for a power tool further includes a braking spring, and the braking spring is provided on the mounting boss and the U-shaped between contacts.

In one embodiment, the DC switch assembly for a power tool further includes a speed-adjusting brush, the speed-adjusting brush includes a base body, a first brush finger and a second brush finger, the base body and the pusher rod connection, the first brush finger and the second brush finger are respectively connected to both ends of the base body, and the first brush finger and the second brush finger are symmetrical with respect to the base body set up.

An electric tool, comprising the DC switch assembly for an electric tool according to any one of the above.

In one embodiment, the power tool is an electric drill, an electric wrench, an electric saw or an electric hammer.

The above-mentioned DC switch assembly for electric tools can realize the pre-assembly of the main contact structure by designing the connecting seat. When the main contact structure is assembled, first connect the movable contact piece and the connecting seat to the support frame respectively, and then connect the two ends of the tension spring to the support frame respectively. The main contact structure can be pre-assembled when the movable contact piece and the connecting rod on the connecting base are sleeved. After the main contact structure is pre-assembled, the main contact structure can be directly installed on the reserved installation position on the base to complete the main contact structure. Contact structure installation. The main contact structure of the above-mentioned DC switch assembly for electric tools can be pre-assembled outside the base, the assembly operation is not limited by the installation space inside the base, the assembly operation is simple and convenient, and the assembly efficiency is high, which can effectively improve the DC switch assembly for electric tools. Moreover, the pre-assembled main contact structure can be directly installed on the reserved installation position on the base, and the automatic assembly of the DC switch assembly for electric tools can be realized.

The above-mentioned electric power tool has the beneficial effect of high production efficiency by applying the above-mentioned DC switch assembly for electric power tools.

Description of drawings

1 is a schematic structural diagram of a DC switch assembly for a power tool in one embodiment;

Figure 2 is a schematic diagram of the internal structure of a DC switch assembly for a power tool in one direction;

3 is a schematic diagram of the internal structure of the DC switch assembly for a power tool in another direction;

4 is a schematic structural diagram of a main contact structure in one direction in one embodiment;

5 is a schematic structural diagram of a main contact structure in another direction in one embodiment;

6 is a schematic structural diagram of a reversing mechanism in an embodiment;

Fig. 7 is a structural cross-sectional view of the reversing mechanism in one embodiment;

8 is a schematic structural diagram of a reversing connecting piece in an embodiment;

9 is a schematic structural diagram of a brake pad in an embodiment;

FIG. 10 is a schematic structural diagram of a speed regulating brush in one embodiment.

Description of reference numbers:

10-base, 20-push rod, 30-main contact structure, 40-holding handle, 50-reversing mechanism, 60-brake pad, 70-speed regulating brush;

21-Installation boss, 31-Moving contact piece, 32-Support frame, 33-Extension spring, 34-Connecting seat, 51-Reversing lever, 52-Reversing contact piece, 53-Reversing connecting piece, 61- connecting part, 62-U-shaped contact part, 63-brake spring, 71-base body, 72-first brush finger, 73-second brush finger;

341-base, 342-connecting rod, 511-accommodating groove, 512-protrusion strip, 521-protrusion, 531-extension.

Detailed ways

The technical solutions of the present invention are further described below with reference to the accompanying drawings and through specific embodiments.

In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", The orientation or positional relationship indicated by "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the indicated device. Or elements must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention.

Please refer to FIG. 1 to FIG. 10 at the same time, a DC switch assembly for a power tool according to an embodiment includes a base 10 , a push rod 20 and a main contact structure 30 , the main contact structure 30 is disposed in the base 10 , and the main contact structure 30 includes a moving contact piece 31. The support frame 32, the tension spring 33 and the connecting seat 34, the movable contact piece 31 is connected with the support frame 32, the connecting seat 34 includes a base 341 and a connecting rod 342 arranged on the base 341, the base 341 and the support frame 32 Connection, one end of the tension spring 33 is connected with the connecting rod 342, the other end of the tension spring 33 is connected with the movable contact piece 31, the support frame 32 is connected with the base 10, the push rod 20 is partially set in the base 10, and the push rod 20 is set in The inner part of the base 10 is movably connected with the movable contact piece 31 .

The above-mentioned DC switch assembly for electric tools can realize the pre-assembly of the main contact structure 30 by designing the connecting seat 34. When the main contact structure 30 is assembled, first connect the movable contact piece 31 and the connecting seat 34 to the support frame 32 respectively, and then pull the pulley. The two ends of the spring 33 are respectively sleeved with the movable contact piece 31 and the connecting rod 342 on the connecting base 34 to complete the pre-assembly of the main contact structure 30. After the pre-assembly of the main contact structure 30 is completed, the main contact structure 30 is directly assembled as a whole. The main contact structure 30 can be installed at the reserved installation position on the base 10 . The main contact structure 30 of the above-mentioned DC switch assembly for electric tools can be pre-assembled outside the base 10, the assembly operation is not limited by the installation space inside the base 10, the assembly operation is simple and convenient, and the assembly efficiency is high, which can effectively improve the power tool use. The assembly efficiency of the DC switch assembly is improved, and the pre-assembled main contact structure 30 can be directly installed in the reserved installation position on the base 10, which can realize the automatic assembly of the DC switch assembly for electric tools.

In one embodiment, the connecting rod 342 is provided with a slot, and one end of the tension spring 33 is accommodated in the slot. Specifically, opening a slot on the connecting rod 342 to accommodate the tension spring 33 can prevent the tension spring 33 from falling off the connecting rod 342 and ensure stable and reliable installation of the tension spring 33 .

In one embodiment, the base 341 is provided with a slot, and the support frame 32 is connected to the base 341 by plugging through the slot. When the support frame 32 and the connecting seat 34 are assembled, the support frame 32 can be directly inserted into the slot. , the installation operation is simple and convenient.

In one embodiment, the DC switch assembly for a power tool further includes a holding handle 40 , and the holding handle 40 is connected to a portion of the push rod 20 disposed outside the base 10 . Specifically, operating the handle 40 can drive the push rod 20 to move within the base 10 , so that the push rod 20 and the movable contact piece 31 can be abutted or separated from each other, so that the movable contact piece 31 can be disconnected or connected to the motor power. . More specifically, in the initial state, the push rod 20 is in contact with the movable contact piece 31 , the movable contact piece 31 is in a disconnected state, and the motor is not powered on; the grip handle 40 is pushed, and the grip handle 40 drives the push rod 20 Move to the inside of the base 10, the push rod 20 and the movable contact piece 31 are separated from each other, the movable contact piece 31 is switched to the conducting state under the elastic force of the tension spring 33, the motor power is turned on, and the motor starts to work; Holding the handle 40, the push rod 20 moves to the outside of the base 10 to reset under the action of the push rod spring. After the push rod 20 is reset, it abuts against the movable contact piece 31 and overcomes the elastic force of the tension spring 33 to switch the movable contact piece 31 back off. state, the motor power is disconnected and the motor stops working.

In one embodiment, the DC switch assembly for a power tool further includes a reversing mechanism 50 , the reversing mechanism 50 includes a reversing lever 51 and a reversing contact piece 52 , and an accommodating slot 511 is opened on the reversing lever 51 to accommodate The groove wall of the accommodating groove 511 is provided with a protruding strip 512, and the end of the reversing contact piece 52 is provided with a protruding portion 521. After the reversing contact piece 52 is inserted into the accommodating slot 511, the protruding portion 521 and the protruding strip 512 are locked. catch. Specifically, when the reversing contact piece 52 is installed, first incline the reversing contact piece 52 at a certain angle so that the protruding portion 521 passes through the protruding bar 512 and slides into the accommodating groove 511. After the protruding portion 521 is fully inserted, the reversing The contact piece 52 is straightened. At this time, the raised strip 512 is clamped with the raised portion 521, which can prevent the reversing contact piece 52 from coming out of the accommodating groove 511, thereby making the installation of the reversing contact piece 52 stable and reliable, and effectively avoiding the occurrence of reversing. The phenomenon that the contact piece 52 falls off the reversing lever 51 does not require repeated installation of the reversing contact piece 52, which can further improve the assembly efficiency of the DC switch assembly for electric tools, and can meet the automatic assembly requirements of the DC switch assembly for electric tools.

In one embodiment, the reversing mechanism 50 further includes a reversing connecting piece 53 , and the reversing connecting piece 53 has an extension portion 531 , and the extending portion 531 is connected to the reversing contact piece 52 . Specifically, one end of the reversing connecting piece 53 is connected to the motor terminal, and the other end is bent and extended in a direction parallel to the setting direction of the reversing contact piece 52 to form an extension portion 531 , and the extending portion 531 is in contact with the reversing contact piece 52 , The provision of the extension portion 531 can realize the plane contact between the reversing connecting piece 53 and the reversing contact piece 52 , which can be increased compared with the traditional contact method in which the reversing connecting piece 53 is only in point contact with the reversing contact piece 52 through the end section. The contact area is reduced, the resistance is reduced, the current carrying capacity can be increased, the heat dissipation performance can be improved, and the service life of the DC switch assembly for electric tools can be prolonged.

In one embodiment, the DC switch assembly for a power tool further includes a brake pad 60 , the brake pad 60 includes an integrally formed connecting portion 61 and a U-shaped contact portion 62 , the push rod 20 is provided with a mounting boss 21 , and the connecting portion 61 is connected to The mounting boss 21 is connected. Specifically, the brake pad 60 moves with the push rod 20. When the movable contact piece 31 is switched from the on state to the off state, the brake pad 60 short-circuits both ends of the motor with the movement of the push rod, so that the motor stops immediately after the power is turned off. , to avoid the damage to the human body caused by the motor continuing to work under the action of inertia, and to ensure the safety of the power tool. In this embodiment, a brake pad 60 with a U-shaped contact portion 62 is designed, and a mounting boss 21 is arranged on the side of the push rod 20 to install the brake pad 60. The brake pad 60 adopts a U-shaped structure and is arranged on the side of the push rod 20, Realize that the brake pads 60 and the base 10 are spaced apart, and there will be no friction between the brake pads 60 and the base 10, so that the phenomenon of brake failure caused by the plastic adhesion of the brake pads 60 and the base 10 due to frictional heat can be avoided, and the braking is stable and reliable. . Further, the U-shaped contact portion 62 and the terminals at both ends of the motor are in tangential frictional contact between the arc surface and the plane, and the contact area is large, and the dirt on the surface of the terminals can be removed during the contact with the terminals at both ends of the motor, resulting in self-cleaning. The effect is helpful to prolong the service life of DC switch components for power tools.

In one embodiment, the connecting portion 61 is connected to the mounting boss 21 in a socket connection, and the DC switch assembly for the power tool further includes a braking spring 63 , which is arranged between the mounting boss 21 and the U-shaped contact portion 62 . Specifically, in order to facilitate the disassembly and maintenance of the brake pad 60 , in this embodiment, the connecting portion 61 is designed to be connected with the boss 21 in a sleeved connection, and a brake spring 63 is arranged between the connecting portion 61 and the mounting boss 21 to ensure braking The connection between the pad 60 and the mounting boss 21 is more stable and reliable, and provides sufficient thrust to the brake pad 60 to ensure stable and reliable contact between the brake pad 60 and the terminals at both ends of the motor. Further, in order to further improve the installation stability of the brake pads, a baffle plate is also provided on the installation boss 21 , and the baffle plate blocks the brake pads 60 on the outside of the connecting portion 61 to prevent the brake pads 60 from falling off the installation boss 21 .

In one embodiment, the DC switch assembly for a power tool further includes a speed regulating brush 70 . The speed regulating brush 70 includes a base body 71 , a first brush finger 72 and a second brush finger 73 , and the base body 71 is connected to the push rod 20 . The first brush fingers 72 and the second brush fingers 73 are respectively connected to two ends of the base body 71 , and the first brush fingers 72 and the second brush fingers 73 are symmetrically arranged relative to the base body 71 . Specifically, the base body 71 , the first brush finger 72 and the second brush finger 73 are integrally formed, the push rod 20 is provided with a mounting groove, and the speed regulating brush 70 is arranged in the mounting groove and passes through the base body 71 and the push rod. 20 connection, the base body 71 can be fixed on the push rod 20 by fasteners (such as locks or bolts). In this embodiment, the first brush fingers 72 and the second brush fingers 73 are symmetrically arranged on both sides of the base body 71 , and the first brush fingers 72 and the second brush fingers 73 on both sides of the base body 71 receive balanced forces, which can overcome the The traditional first brush finger 72 and the second brush finger 73 are arranged in the same direction, resulting in the problem of unstable speed regulation and scratching of carbon film caused by unbalanced force. The DC switch assembly for power tools has stable speed regulation and long service life. .

The present invention also provides an electric tool, comprising the above-mentioned DC switch assembly for the electric tool. Specifically, the power tool may be, but is not limited to, an electric drill, an electric wrench, an electric saw or an electric hammer. The power tool of this embodiment has the beneficial effect of high production efficiency by applying the above-mentioned DC switch assembly for the power tool.

The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity, all possible combinations of the technical features in the above-described embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be regarded as the scope described in this specification.

The above-mentioned embodiments only represent several embodiments of the present invention, and the descriptions thereof are more specific and detailed, but should not be construed as a limitation on the scope of the invention patent. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can also be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the appended claims.

Claims (10)

1. A DC switch assembly for a power tool, comprising: a base (10), a push rod (20) and a main contact structure (30), the main contact structure (30) is arranged in the base (10), the main contact structure (30) comprises a movable contact piece (31), a support frame (32), a tension spring (33) and a connecting seat (34), the movable contact piece (31) is connected with the support frame (32), the connecting seat (34) comprises a base (341) and a connecting rod (342) arranged on the base (341), the base (341) is connected with the support frame (32), one end of the tension spring (33) is connected with the connecting rod (342), the other end of the tension spring (33) is connected with the movable contact spring (31), the support frame (32) is connected with the base (10), the push rod (20) is partially arranged in the base (10), and the part of the push rod (20) arranged in the base (10) is movably connected with the movable contact piece (31).

2. The dc switch module for electric tool according to claim 1, wherein the connecting rod (342) is provided with a locking groove, and one end portion of the tension spring (33) is received in the locking groove.

3. The dc switch assembly of claim 1, wherein the base (341) has a slot, and the supporting frame (32) is connected to the base (341) through the slot.

4. The direct current switch assembly for the electric tool according to claim 1, further comprising a reversing mechanism (50), wherein the reversing mechanism (50) comprises a reversing deflector rod (51) and a reversing contact piece (52), an accommodating groove (511) is formed in the reversing deflector rod (51), a protruding strip (512) is arranged on a groove wall of the accommodating groove (511), a protruding portion (521) is arranged at an end portion of the reversing contact piece (52), and the protruding portion (521) is clamped with the protruding strip (512) after the reversing contact piece (52) is inserted into the accommodating groove (511).

5. The direct current switch assembly for a power tool according to claim 4, wherein the reversing mechanism (50) further comprises a reversing connection piece (53), the reversing connection piece (53) having an extension portion (531), the extension portion (531) being connected to the reversing contact piece (52).

6. The direct current switch assembly for the electric tool according to claim 1, further comprising a brake pad (60), wherein the brake pad (60) comprises a connecting portion (61) and a U-shaped contact portion (62) which are integrally formed, the push rod (20) is provided with a mounting boss (21), and the connecting portion (61) is connected with the mounting boss (21).

7. The dc switch assembly for electric tool according to claim 1, wherein the connecting portion (61) is connected to the mounting boss (21) in a sleeved manner, and further comprising a braking spring (63), wherein the braking spring (63) is disposed between the mounting boss (21) and the U-shaped contact portion (62).

8. The dc switch assembly for power tool according to claim 1, further comprising a speed regulating brush (70), wherein the speed regulating brush (70) comprises a base body (71), a first brush finger (72) and a second brush finger (73), the base body (71) is connected with the push rod (20), the first brush finger (72) and the second brush finger (73) are respectively connected to both ends of the base body (71), and the first brush finger (72) and the second brush finger (73) are symmetrically arranged with respect to the base body (71).

9. An electric power tool comprising the dc switch assembly for an electric power tool according to any one of claims 1 to 8.

10. The power tool of claim 9, wherein the power tool is a power drill, a power wrench, a power saw, or a power hammer.

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