CN111993353A

CN111993353A - Hand-held electric tool

Info

Publication number: CN111993353A
Application number: CN202010880569.7A
Authority: CN
Inventors: 陈会甫; 闵新林
Original assignee: Ningbo Hanpu Tools Co ltd
Current assignee: Ningbo Hanpu Tools Co ltd
Priority date: 2020-08-27
Filing date: 2020-08-27
Publication date: 2020-11-27

Abstract

The invention provides a hand-held electric tool, belonging to the technical field of electric tools, comprising: a mounting seat; the shifting fork is arranged on the mounting seat in a swinging manner; a permanent magnet element disposed on the yoke and having a first magnetic pole and a second magnetic pole; the electromagnetic element is fixed on the mounting seat and is close to the permanent magnetic element, the electromagnetic element is provided with two third magnetic poles, the two third magnetic poles are homonymous magnetic poles, and the two third magnetic poles respectively correspond to the first magnetic pole and the second magnetic pole so as to drive the shifting fork to swing. The invention has the beneficial effects that: the electric tool can enable the shifting fork to efficiently realize the action of horizontal swinging, has a simple and ingenious integral structure, and is very convenient to produce and install.

Description

Hand-held electric tool

Technical Field

The invention belongs to the technical field of electric tools, and relates to a handheld electric tool.

Background

The conventional electric tool comprises a working part, a motor, a transmission mechanism, a starting switch, a control circuit, an energy providing unit and the like, wherein the starting switch is closed, a loop between the energy providing unit and the motor is connected, the control circuit controls the motor to start rotating, and the transmission mechanism transmits the rotation of the motor to the working part to execute corresponding work. Wherein, when the energy supply unit is a battery pack, the battery pack is detachably connected with the electric tool.

For example, one of the chinese patent applications, application No. 201610045437.6, discloses a power device for providing power to a tool body of a power tool, the tool body including a tool housing, and a working member supported by the tool housing; the power unit includes a main housing, and a motor and control circuitry supported by the main housing, the control circuitry controlling rotational movement of the motor; the main housing is removably mountable with the tool housing, the working member being drivable by the motor when the main housing is mounted to the tool housing.

However, the driving structure in the electric power tool is not suitable for a reciprocating electric power tool, and for example, some electric power tools require an actuator to perform a horizontal swinging operation.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides a handheld electric tool.

The purpose of the invention can be realized by the following technical scheme: a hand-held power tool comprising:

a mounting seat;

the shifting fork is arranged on the mounting seat in a swinging manner;

a permanent magnet element disposed on the yoke and having a first magnetic pole and a second magnetic pole;

the electromagnetic element is fixed in the mounting seat and is close to the permanent magnetic element, the electromagnetic element is provided with two third magnetic poles, the two third magnetic poles are homonymous magnetic poles, and the two third magnetic poles respectively correspond to the first magnetic pole and the second magnetic pole so as to drive the shifting fork to swing.

Preferably, the mounting seat is provided with an output shaft, the shifting fork is provided with a connecting hole, and the output shaft penetrates through the connecting hole to be connected with the shifting fork.

Preferably, the two sides of the shifting fork are provided with limiting blocks, the mounting seat is provided with a limiting end face, and the limiting blocks are used for abutting against the limiting end face to limit the swing stroke of the shifting fork.

Preferably, the permanent magnet element comprises two permanent magnets, the two permanent magnets are fixed on the shifting fork and both face the electromagnetic element, and the second magnetic pole and the first magnetic pole are respectively located on the two permanent magnets.

Preferably, the electromagnetic element includes a soft magnet and a coil, the coil is disposed on the soft magnet, the soft magnet includes a synonym magnetic arm and two synonym magnetic arms, the two third magnetic poles are respectively disposed on the two synonym magnetic arms, and the synonym magnetic arm and the two synonym magnetic arms are synonym magnetic poles.

Preferably, the soft magnet is of a chevron structure, the two homonymous magnetic arms are respectively arranged on two sides of the heteronymous magnetic arm, the two homonymous magnetic arms are integrally connected with the heteronymous magnetic arm, and the coil is sleeved on the heteronymous magnetic arm.

Preferably, the permanent magnets and the soft magnets are arranged in an up-down corresponding manner, the two permanent magnets are located between the two same-name magnetic arms, and the different-name magnetic arms are located between the two permanent magnets.

Preferably, the soft magnet is formed by overlapping a plurality of silicon steel sheets, and the magnetic poles of the same-name magnetic arm and the different-name magnetic arm are changed when the current direction of the coil is changed.

Preferably, the automatic transmission further comprises a working element, and the working element is arranged on the output shaft so as to be in linkage connection with the shifting fork.

Compared with the prior art, the invention has the beneficial effects that:

1. this hand-held type electric tool can make the shift fork efficient realize the action of horizontal hunting to overall structure is simple ingenious, and production installation is also very convenient.

2. Set up spacing terminal surface on the mount pad, when the shift fork rotated certain angle, stopper and spacing terminal surface contradicted together for the shift fork can only make a round trip to rotate within a certain limit.

3. Each permanent magnet is provided with an N magnetic pole and an S magnetic pole, the second magnetic pole of one permanent magnet faces the electromagnetic element, the first magnetic pole of the other permanent magnet faces the electromagnetic element, and two different magnetic poles are respectively arranged on two sides of the bottom of the shifting fork.

4. The synonym magnetic arm can drive the shifting fork to rotate, and the synonym magnetic arm can assist the shifting fork to rotate, for example, when the magnetic poles of the two synonym magnetic arms are N, the magnetic pole of the synonym magnetic arm is S, so the synonym magnetic arm can attract the second magnetic pole and repel the first magnetic pole, so that the synonym magnetic arm and the synonym magnetic arm can be matched together to drive the shifting fork to rotate, and the shifting fork is ensured to be smooth when swinging.

5. When the coil is sleeved on the unlike magnetic arm, the coil is electrified, so that the unlike magnetic arm generates magnetism, and the like magnetic arm connected with the unlike magnetic arm generates opposite magnetism, so that three magnetic poles can be generated through the coil, and particularly N, S, N or S, N, S magnetic poles can be generated on the three magnetic arms of the soft magnet through one coil.

Drawings

Fig. 1 is a schematic structural diagram of a handheld electric tool according to the present invention.

Fig. 2 is a schematic structural diagram of a permanent magnetic element and an electromagnetic element according to the present invention.

Fig. 3 is a schematic structural diagram of an electromagnetic element according to the present invention.

Fig. 4 is a schematic view of the connection relationship between the working element and the output shaft according to the present invention.

In the figure, 100, a mounting seat; 110. an output shaft; 120. a limiting end face; 200. a shifting fork; 210. connecting holes; 220. a limiting block; 300. a permanent magnet; 310. a first magnetic pole; 320. a second magnetic pole; 400. a soft magnetic body; 410. a synonym magnetic arm; 420. a magnetic arm of the same name; 430. a third magnetic pole; 500. a coil; 600. a working element.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1, 2, 3, and 4, a hand-held power tool includes: mounting 100, fork 200, permanent magnet elements and electromagnetic elements, and the hand-held power tool can be a grinding tool, a milling tool, a sawing tool, a cutting tool, a rasping tool, but also a drilling hammer, a chiseling hammer, a hammer drill, a breaking hammer, a drilling machine, a milling machine, a sawing machine, a battery screwdriver and/or a gardening implement or similar.

The mount 100 is the housing structure for the fixture, and in the actual structure, the mount 100 is the power tool housing portion.

The fork 200 is swingably disposed on the mount 100, and in brief, the fork 200 is similar to a pendulum structure, and can swing back and forth left and right, and the fork 200 drives the electric tool to work by this reciprocating back and forth swing.

The permanent magnetic element is a magnetic element, and in a practical structure, a magnet can be selected, the permanent magnetic element is disposed on the fork 200, and the permanent magnetic element has a first magnetic pole 310 and a second magnetic pole 320, the first magnetic pole 310 and the second magnetic pole 320 are unlike magnetic poles, that is, the magnetic poles of the first magnetic pole 310 and the second magnetic pole 320 are opposite, when the first magnetic pole 310 is an N pole, the second magnetic pole 320 is an N pole, and when the first magnetic pole 310 is an S pole, the second magnetic pole 320 is an N pole.

It should be noted that the permanent magnet element may be two magnets, or may be a U-shaped or bar-shaped magnet, when the permanent magnet element is two magnets, the first magnetic pole 310 of one magnet faces downward, and the second magnetic pole 320 of the other magnet faces downward, so that the left and right portions of the fork 200 respectively have the first magnetic pole 310 and the second magnetic pole 320; when one of the permanent magnet elements is selected, two ends of the magnet (i.e., the pole ends having the first pole 310 and the second pole 320) are respectively located at the left portion and the right portion of the fork 200.

In summary, the permanent magnet element has a first magnetic pole 310 and a second magnetic pole 320, mainly to enable the fork 200 to form two magnetic fields with different magnetism, and then magnetically drive the fork 200 to swing.

And an electromagnetic element fixed in the mounting seat 100 and close to the permanent magnetic element, wherein in a practical structure, the electromagnetic element is a fixed type, and the electromagnetic element is an electromagnet structure, and when the electromagnetic element is electrified, a magnetic field can be generated, and when the direction of current is changed, the magnetic field is also changed.

The electromagnetic element has two third magnetic poles 430, the two third magnetic poles 430 are same magnetic poles, preferably, the two third magnetic poles 430 have same magnetic names, in short, the two third magnetic poles 430 are N poles or S poles at the same time, and cannot be N poles or S poles.

And the two third magnetic poles 430 correspond to the first magnetic pole 310 and the second magnetic pole 320, respectively, to drive the fork 200 to swing.

Preferably, the lower end of the fork 200 is disposed corresponding to the upper end of the electromagnetic element, and when the fork 200 is not energized, the fork 200 is centered, when the fork is energized, the two third magnetic poles 430 are N-poles or S-poles, and the fork 200 has the second magnetic pole 320 and the first magnetic pole 310, wherein one of the third magnetic poles 430 attracts the fork 200, and the other one of the third magnetic poles 430 repels the fork 200, so as to finally deflect the fork 200, and when the magnetic poles of the third magnetic poles 430 change, the fork 200 can be driven to rotate in the opposite direction.

For example, when the magnetic names of the two third magnetic poles 430 are both N, the second magnetic pole 320 on the fork 200 can repel one of the third magnetic poles 430, the first magnetic pole 310 on the fork 200 can be attracted by the other third magnetic pole 430, so that the fork 200 deflects, and when the current direction changes, the magnetic names of the two third magnetic poles 430 become S-poles, so that the fork 200 rotates in the opposite direction, and as the current direction changes continuously, the magnetic names of the two third magnetic poles 430 change continuously between the N-poles and the S-poles, so as to drive the fork 200 to swing continuously left and right.

The driving structure can enable the shifting fork 200 to efficiently realize the action of horizontal swinging, and the whole structure is simple and ingenious, and the production and installation are also very convenient.

As shown in fig. 1 and 4, in addition to the above embodiment, the mounting seat 100 is provided with an output shaft 110, the fork 200 is provided with a connection hole 210, and the output shaft 110 is connected to the fork 200 through the connection hole 210.

Preferably, the output shaft 110 is rotatable, and a bearing is arranged in the mounting seat 100, the output shaft 110 is connected to the mounting seat 100 through the bearing, and the output shaft 110 is connected to the shift fork 200 through the connecting hole 210 in an interlocking manner, so that the shift fork 200 can drive the output shaft 110 to rotate forward and backward when swinging.

As shown in fig. 1 and 2, on the basis of the above embodiment, two sides of the shifting fork 200 are provided with the limiting blocks 220, the mounting seat 100 is provided with the limiting end surface 120, and the limiting blocks 220 are used for abutting against the limiting end surface 120 so as to limit the swing stroke of the shifting fork 200.

Preferably, mount pad 100 is shell structure to shift fork 200 needs the restriction rotation range when the horizontal hunting, so set up spacing terminal surface 120 on mount pad 100, when shift fork 200 rotated certain angle, stopper 220 contradicted together with spacing terminal surface 120, made shift fork 200 only can make a round trip to rotate at the certain limit within a definite range.

Preferably, the limiting block 220 is made of an elastic member or a flexible material, so that abnormal noise or collision cannot be generated when the limiting block 220 collides with the limiting end surface 120, and the shifting block can be pushed to rotate reversely after the limiting block 220 contacts with the limiting end surface 120.

As shown in fig. 1, 2 and 3, on the basis of the above embodiment, the permanent magnet element includes two permanent magnets 300, the two permanent magnets 300 are fixed on the fork 200 and both face the electromagnetic element, and the second magnetic pole 320 and the first magnetic pole 310 are respectively located on the two permanent magnets 300.

Preferably, the permanent magnets 300 are magnets or magnets, each permanent magnet 300 has N and S poles, and the second pole 320 of one permanent magnet 300 faces the electromagnetic member, and the first pole 310 of the other permanent magnet 300 faces the electromagnetic member, so that the two sides of the bottom of the fork 200 have two different poles, respectively.

And in a practical structure, the lower end of the fork 200 has an arc-shaped bottom surface, and the two permanent magnets 300 are respectively located at both sides of the bottom surface of the fork 200.

As shown in fig. 1, 2, 3, and 4, based on the above embodiment, the electromagnetic element includes a soft magnet 400 and a coil 500, the coil 500 is disposed on the soft magnet 400, the soft magnet 400 includes a synonym magnet arm 410 and two synonym magnet arms 420, the two third magnetic poles 430 are respectively disposed on the two synonym magnet arms 420, and the synonym magnet arm 410 and the two synonym magnet arms 420 are synonym magnetic poles.

Preferably, the soft magnet 400 is made of iron-silicon alloy, the coil 500 is sleeved on the soft magnet 400, when the coil 500 is electrified, the soft magnet 400 is electrified and magnetically induces to generate magnetism, and the structure of the soft magnet 400 is more specific, a different-name magnetic arm 410 and two same-name magnetic arms 420 can be formed, wherein the magnetism of the different-name magnetic arm 410 is opposite to that of the same-name magnetic arms 420, for example, when the magnetic pole of the different-name magnetic arm 410 is S pole, the magnetic pole of the same-name magnetic arm 420 is N pole; when the magnetic pole of the different-name magnetic arm 410 is N, the magnetic pole of the same-name magnetic arm 420 is S-pole, in short, the magnetic poles of the two are opposite, and the magnetic poles of the two same-name magnetic arms 420 are the same.

In an actual structure, when the two like magnetic arms 420 are energized to form the third magnetic pole 430, since the fork 200 has the two opposite permanent magnets 300, the two third magnetic poles 430 can interact with the second magnetic pole 320 and the first magnetic pole 310 to push the fork 200 to rotate, and when the fork 200 rotates, the permanent magnet 300 close to the unlike magnetic arm 410 can attract the unlike magnetic arm 410 to further drive the fork 200 to rotate.

On the basis of the structure, the synonym magnetic arm 420 can drive the shifting fork 200 to rotate, and the synonym magnetic arm 410 can assist the shifting fork 200 to further rotate, for example, when the magnetic poles of the two synonym magnetic arms 420 are N poles, the magnetic pole of the synonym magnetic arm 410 is S pole, the synonym magnetic arm 420 drives the shifting fork 200 to rotate, so that the second magnetic pole 320 on the shifting fork 200 is close to the synonym magnetic arm 410, so the synonym magnetic arm 410 can attract the second magnetic pole 320, and the synonym magnetic arm 420 and the synonym magnetic arm 410 can be matched together to drive the shifting fork 200 to rotate, thereby ensuring the smoothness when the shifting fork 200 swings.

As shown in fig. 1, 2 and 3, in the above embodiment, the soft magnetic body 400 has a chevron structure, the two magnetic arms 420 of the same name are respectively disposed at two sides of the magnetic arm 410 of the different name, and both the two magnetic arms 420 of the same name are integrally connected to the magnetic arm 410 of the different name, and the coil 500 is sleeved on the magnetic arm 410 of the different name.

Preferably, the synonym magnet arm 420 and the synonym magnet arm 410 are vertical structures in nature, and the shape of the soft magnet body 400 determines whether the shift fork 200 can swing reliably and smoothly, and since the two synonym magnet arms 420 are located at both sides of the synonym magnet arm 410 and are integrally connected, when the coil 500 is sleeved on the synonym magnet arm 410, the coil 500 is electrified, so that the synonym magnet arm 410 generates magnetism, and the synonym magnet arm 420 connected with the coil generates opposite magnetism, so that three magnetic poles can be generated through the coil 500, specifically, N, S, N or S, N, S magnetic poles can be generated on the three magnet arms of the soft magnet body 400 through one coil 500.

As shown in fig. 1, 2, and 3, in the above embodiment, the permanent magnets 300 and the soft magnet 400 are disposed in a vertical corresponding manner, two permanent magnets 300 are located between two magnetic arms 420 of the same name, and the magnetic arm 410 of a different name is located between two permanent magnets 300.

Preferably, the positions of the permanent magnet 300 and the soft magnet 400 are skillfully arranged, so that when the soft magnet 400 generates magnetism, the soft magnet 400 can have enough magnetic force to push the shifting fork 200 to shift, and specifically, since the two soft magnets 400 are positioned between the two magnetic arms 420 with the same name and the two soft magnets 400 respectively face the two magnetic arms 420 with the same name, one permanent magnet 300 can be attracted and repelled from the other permanent magnet 300, and the shifting fork 200 can be rotated, and after the shifting fork 200 is rotated, one permanent magnet 300 is close to the magnetic arm 410 with the different name, and the permanent magnet 300 and the magnetic arm 410 are attracted.

In an actual structure, the permanent magnets 300 positioned at the left and right portions of the yoke 200 are the first and second

magnetic poles

310 and 320, respectively, the first magnetic pole 310 is the N pole, the second magnetic pole 320 is the S pole, the synonym magnet arm 420 is the N pole, and the synonym magnet arm 410 is the S pole, the yoke 200 rotates to the right, and the second magnetic pole 320 is close to the synonym magnet arm 410, so that the synonym magnet arm 410 attracts the second magnetic pole 320, the yoke 200 can continue to rotate by the magnetic force of the synonym magnet arm 410, and when the magnetism of the soft magnet 400 changes, the yoke 200 can rotate to the left, and finally the yoke 200 swings back and forth left.

As shown in fig. 1, 2, 3 and 4, in addition to the above embodiment, the soft magnetic body 400 is formed by overlapping a plurality of silicon steel sheets, and the magnetic poles of the same-name magnetic arm 420 and the different-name magnetic arm 410 are changed when the current direction of the coil 500 is changed.

Preferably, the silicon steel sheets are overlapped to form the soft magnet 400, and when the coil 500 is energized, the soft magnet 400 can form three magnetic poles, thereby operating the electric tool.

As shown in fig. 1 and 4, in addition to the above embodiments, the present invention further includes a working element 600, and the working element 600 is disposed on the output shaft 110 so as to be coupled with the shift fork 200.

Preferably, the working element 600 is a working portion of the electric power tool, and when the fork 200 swings, the output shaft 110 can be rotated forward and backward to drive the working element 600 to swing left and right, and in an actual structure, the working element 600 has a sheet-like, blade-like, or drill-like structure.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims

1. A hand-held power tool, comprising:

a mounting seat;

the shifting fork is arranged in the mounting seat in a swinging manner;

2. A hand held power tool as claimed in claim 1, wherein: the mounting seat is provided with an output shaft, the shifting fork is provided with a connecting hole, and the output shaft penetrates through the connecting hole to be connected with the shifting fork.

3. A hand held power tool as claimed in claim 2, wherein: the two sides of the shifting fork are provided with limiting blocks, limiting end faces are arranged on the mounting seat, and the limiting blocks are used for abutting against the limiting end faces to limit the swing stroke of the shifting fork.

4. A hand held power tool as claimed in claim 1, wherein: the permanent magnet element comprises two permanent magnets, the two permanent magnets are fixed on the shifting fork and face the electromagnetic element, and the second magnetic pole and the first magnetic pole are located on the two permanent magnets respectively.

5. A hand held power tool according to claim 4, wherein: the electromagnetic element comprises a soft magnet and a coil, wherein the coil is arranged on the soft magnet, the soft magnet comprises a synonym magnetic arm and two synonym magnetic arms, the two third magnetic poles are respectively positioned on the two synonym magnetic arms, and the synonym magnetic arm and the two synonym magnetic arms are synonym magnetic poles.

6. A hand held power tool according to claim 5, wherein: the soft magnet is of a herringbone structure, the two homonymous magnetic arms are arranged on two sides of the heteronymous magnetic arm respectively, the two homonymous magnetic arms are integrally connected with the heteronymous magnetic arm, and the coil is sleeved on the heteronymous magnetic arm.

7. A hand held power tool according to claim 6, wherein: the permanent magnets and the soft magnets are arranged in an up-down corresponding mode, the two permanent magnets are located between the two same-name magnetic arms, and the different-name magnetic arms are located between the two permanent magnets.

8. A hand held power tool according to claim 5, wherein: the soft magnet is formed by overlapping a plurality of silicon steel sheets, and the magnetic poles of the same-name magnetic arm and the different-name magnetic arm are changed when the current direction of the coil is changed.

9. A hand held power tool as claimed in claim 2, wherein: the working element is arranged on the output shaft so as to be in linkage connection with the shifting fork.