CN212231284U

CN212231284U - Electric tool

Info

Publication number: CN212231284U
Application number: CN202021320577.8U
Authority: CN
Inventors: 程永辉
Original assignee: Nanjing Tangfeng Mechanical & Electrical Co ltd
Current assignee: Nanjing Tangfeng Mechanical & Electrical Co ltd
Priority date: 2020-07-07
Filing date: 2020-07-07
Publication date: 2020-12-25
Anticipated expiration: 2030-07-07

Abstract

The utility model provides an electric tool, which comprises an output shaft, a motor for driving the output shaft, a battery for supplying power to the motor, a circuit board electrically connected with the battery and a metal shell arranged outside the output shaft, wherein the metal shell is electrically insulated from the output shaft; the positive end of the circuit board is electrically connected with one of the metal shell and the output shaft, and the negative end of the circuit board is electrically connected with the other of the metal shell and the output shaft. The utility model discloses in, through regard as output shaft and metal casing respectively just, the negative pole of usefulness of charging, need not to set up the interface that charges in addition, be favorable to reducing the component cost and simplify the equipment process simultaneously to reduce the complete machine cost.

Description

Electric tool

Technical Field

The utility model relates to an industrial equipment field especially relates to an electric tool.

Background

The electric tool is a mechanical tool which takes a motor as power and drives a working head through a transmission mechanism. With the development of batteries, more and more electric tools select batteries (such as lithium batteries, battery pinching, etc.) as power sources. Compared with an alternating current electric tool, the direct current electric tool does not need an external alternating current power supply and can be widely applied to scenes without the alternating current power supply, such as outdoors and the like. Due to the built-in battery, the electric tool needs to be separately provided with a charging interface to charge the battery, which undoubtedly increases the cost of the whole machine.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a need not to set up the electric tool of the interface that charges alone.

The utility model provides an electric tool, which comprises an output shaft, a motor for driving the output shaft, a battery for supplying power to the motor, a circuit board electrically connected with the battery and a metal shell arranged outside the output shaft, wherein the metal shell is electrically insulated from the output shaft; the circuit board comprises a positive end and a negative end, the positive end of the circuit board is electrically connected with one of the metal shell and the output shaft, and the negative end of the circuit board is electrically connected with the other of the metal shell and the output shaft.

Further, the electric tool comprises a positive cable electrically connected to the positive end of the circuit board and a negative cable electrically connected to the negative end of the circuit board, the positive cable is electrically connected to the output shaft, and the negative cable is electrically connected to the metal shell.

Furthermore, the electric tool comprises an illuminating lamp and an electric connector, the positive cable is electrically connected with the positive pole of the illuminating lamp, and the electric connector is electrically connected with the positive pole of the illuminating lamp and the output shaft.

Furthermore, the electric tool comprises a conductive sleeve which is sleeved on the output shaft and is in contact with the output shaft, and the electric connecting piece is respectively in electric contact with the conductive sleeve and the positive electrode of the illuminating lamp.

Furthermore, the electric connector is a metal elastic sheet and is respectively abutted against the conductive sleeve and the anode of the illuminating lamp.

Furthermore, the electric tool comprises an insulating shell, and the insulating shell covers the outer sides of the battery, the motor and the circuit board.

Furthermore, the insulating housing has a first front end face far away from the battery, the metal shell has a second front end face far away from the battery, the second front end face is flush with the first front end face and surrounds the first front end face, and the output shaft protrudes out of the first front end face and the second front end face.

Further, the insulating housing has a grip portion remote from the output shaft, the grip portion surrounding the battery.

Further, the rotation axis of the motor is coincident with or parallel to the rotation axis of the output shaft.

Further, the battery, the motor and the output shaft are arranged in sequence along the length direction of the electric tool.

The utility model discloses in, through regard as output shaft and metal casing respectively just, the negative pole of usefulness of charging, need not to set up the interface that charges in addition, be favorable to reducing the component cost and simplify the equipment process simultaneously to reduce the complete machine cost.

Drawings

Fig. 1 is a schematic view of an angle of a power tool according to an embodiment of the present invention.

Fig. 2 is a schematic view of the power tool shown in fig. 1 from another angle, with a partially insulated housing not shown.

Fig. 3 is a partially enlarged schematic view of fig. 2.

Fig. 4 is a schematic view of the structure of the motor, the output shaft, the electric connection member, and the like of the electric power tool shown in fig. 1.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus consistent with certain aspects of the invention, as detailed in the appended claims.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which the invention belongs. The use of "first," "second," and similar terms in the description and in the claims does not indicate any order, quantity, or importance, but rather is used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. "plurality" or "a number" means two or more. Unless otherwise indicated, "front", "rear", "lower" and/or "upper" and the like are for convenience of description and are not limited to one position or one spatial orientation. The word "comprising" or "comprises", and the like, means that the element or item listed as preceding "comprising" or "includes" covers the element or item listed as following "comprising" or "includes" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. As used in the specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

Referring to fig. 1 to 2, the electric tool of the present embodiment is an electric screwdriver, which includes an insulating housing 1, an output shaft 2, a metal housing 3, a motor 4, a transmission mechanism 5, a battery 6 and a circuit board 7. The insulating housing 1 covers the motor 4, the transmission mechanism 5, the battery 6 and the circuit board 7, the metal shell 3 is installed at the front end of the insulating housing, and the front end face 30 of the metal shell 3 is exposed, in this embodiment, the metal shell 3 is a front cover. The output shaft 2 protrudes from the front end face 30, and the output shaft 2 is used for mounting a working head, such as a bit. A partially insulating housing is provided between the output shaft 2 and the metal housing 3 to maintain electrical insulation of the output shaft 2 from the metal housing 3. The battery 6 is electrically connected to the circuit board 7; the motor 4 is electrically connected to the circuit board 7 and used for receiving a power supply signal and a control signal; the transmission mechanism 5 is used for transmitting the power of the motor 4 to the output shaft 2.

The insulating housing 1 has a first front end face 10 far away from the battery 7, the metal shell 3 has a second front end face 30 far away from the battery 7, the second front end face 30 is flush with the first front end face 10 and surrounds the first front end face 10, and the output shaft 2 protrudes from the first front end face 10 and the second front end face 30. As shown in fig. 1 and 2, the front-back direction is the X direction.

The insulating housing 1 has a grip 11 remote from the output shaft 2, the grip 11 surrounding the battery 6. When the electric tool works normally, because the battery is kept still all the time, compared with the insulating shell part held outside the motor 4 or the transmission mechanism 5, the vibration sensed by a user during operation is smaller, and the damage of machine vibration to human bodies is favorably reduced. The battery 6, the motor 4, and the output shaft 2 are arranged in this order along the longitudinal direction (i.e., the X direction) of the electric power tool. Optionally, the rotation axis of the motor 4 is coincident with or parallel to the rotation axis of the output shaft 2, so that the structure of the transmission mechanism 5 is simpler without arranging complicated transmission elements such as bevel gears. The electric tool further comprises a power switch 12, a forward and reverse rotation switch 13 and an indicator lamp 14, wherein the power switch 12, the forward and reverse rotation switch 13 and the indicator lamp 14 are arranged on the holding portion 11, the power switch 12 is used for connecting a circuit between the motor 4 and the battery 6, the forward and reverse rotation switch 13 is used for switching the rotation direction of the motor 4, so that the rotation direction of the output shaft 2 is changed, and the indicator lamp 14 can be used for indicating the electric quantity of the battery 4 and/or the working state of the electric tool.

The circuit board 7 includes a positive terminal 701 and a negative terminal 702, and the positive terminal 701 and the negative terminal 702 are used for outputting a power signal (corresponding to a state where the electric tool is normally operated) or inputting a power signal (corresponding to a state where the battery is charged). The positive terminal 701 of the circuit board 7 is electrically connected to the output shaft 2, and the negative terminal 702 of the circuit board 7 is electrically connected to the metal shell 3. Optionally, the electric tool includes a positive cable 71 electrically connected to the positive end 701 of the circuit board 7 and a negative cable 72 electrically connected to the negative end 702 of the circuit board 7, the positive cable 71 is electrically connected to the output shaft 2, and the negative cable 72 is electrically connected to the metal shell 3. When the output shaft 2 and the metal shell 3 are electrically connected with the positive electrode and the negative electrode of the charger, the battery 6 can be charged, that is, the output shaft 2 and the metal shell 3 are used as the charging interface of the electric tool. It is understood that the battery 7 includes a battery cell and a power management system, and the power management system is used for controlling charging and discharging of the battery cell. It should be noted that the "electrical connection" in the present application may be a direct electrical connection or an indirect electrical connection, such as an electrical component disposed in the middle for bridging.

In other embodiments, the positive terminal of the circuit board may be electrically connected to the metal shell, and correspondingly, the negative terminal of the circuit board is electrically connected to the output shaft.

Referring to fig. 2 and 3, the electric tool further includes an illumination lamp 8 and an electrical connector 9, the positive cable 71 is electrically connected to the positive electrode of the illumination lamp 8, and the electrical connector 9 is electrically connected to the output shaft 2 and the positive electrode of the illumination lamp 8. The negative electrode of the illuminating lamp 8 is electrically connected with the circuit board 7 through another cable 73, so that the illuminating lamp 8 is powered.

In this embodiment, the electric tool further includes a conductive sleeve 51 sleeved on the output shaft 2 and electrically connected to the output shaft 2, and the electrical connector 9 is electrically contacted to the conductive sleeve 51 and the positive electrode of the illumination lamp 8 respectively. Optionally, the conductive sleeve 51 is a bearing sleeve, which is sleeved outside the output shaft and a bearing (not shown) that supports the output shaft 2, and the conductive sleeve 51 is electrically connected to the output shaft 2 through the bearing. Referring to fig. 4, in the present embodiment, the electrical connector 9 is a metal elastic sheet, and is respectively abutted against the conductive sleeve 51 and the positive electrode of the illumination lamp 8. The metal spring sheet can provide enough elastic holding force to ensure the stability of the connection between the conductive sleeve 51 and the anode of the illuminating lamp 8.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and although the present invention has been disclosed in the above description in terms of preferred embodiments, it is not intended to limit the present invention, and any person skilled in the art can make modifications or changes to equivalent embodiments by using the above disclosed technical contents without departing from the scope of the present invention.

Claims

1. An electric tool is characterized by comprising an output shaft, a motor for driving the output shaft, a battery for supplying power to the motor, a circuit board electrically connected with the battery and a metal shell arranged outside the output shaft, wherein the metal shell is electrically insulated from the output shaft;

the circuit board comprises a positive end and a negative end, the positive end of the circuit board is electrically connected with one of the metal shell and the output shaft, and the negative end of the circuit board is electrically connected with the other of the metal shell and the output shaft.

2. The power tool of claim 1, wherein the power tool includes a positive cable electrically connected to a positive terminal of the circuit board and a negative cable electrically connected to a negative terminal of the circuit board, the positive cable being electrically connected to the output shaft, the negative cable being electrically connected to the metal housing.

3. The power tool of claim 2, wherein the power tool includes a light and an electrical connector, the positive cable electrically connecting with a positive pole of the light, the electrical connector electrically connecting the positive pole of the light with the output shaft.

4. The power tool of claim 3, wherein the power tool includes a conductive sleeve disposed around the output shaft and contacting the output shaft, and the electrical connectors are respectively in electrical contact with the conductive sleeve and a positive electrode of the illumination lamp.

5. The power tool of claim 4, wherein the electrical connector is a metal spring and abuts against the conductive sleeve and the positive electrode of the illumination lamp, respectively.

6. The power tool of claim 1, including an insulative housing covering the outside of the battery, motor and circuit board.

7. The power tool of claim 6, wherein the insulative housing has a first front face remote from the battery, the metal housing has a second front face remote from the battery, the second front face being flush with and surrounding the first front face, and the output shaft protrudes from the first and second front faces.

8. The power tool of claim 6, wherein the insulative housing has a grip portion distal from the output shaft, the grip portion surrounding the battery.

9. The power tool of claim 1, wherein the axis of rotation of the motor coincides with or is parallel to the axis of rotation of the output shaft.

10. The power tool according to any one of claims 1 to 9, wherein the battery, the motor, and the output shaft are arranged in this order along a length direction of the power tool.