CN220839934U

CN220839934U - Electric tool

Info

Publication number: CN220839934U
Application number: CN202321034912.1U
Authority: CN
Inventors: 杨勇
Original assignee: Suzhou Creation Space Intelligent Technology Co ltd
Current assignee: Suzhou Creation Space Intelligent Technology Co ltd
Priority date: 2023-05-04
Filing date: 2023-05-04
Publication date: 2024-04-26
Anticipated expiration: 2033-05-04

Abstract

The present utility model provides an electric tool, which includes: the clutch unit, the power assembly and the output assembly; the clutch unit includes: the clutch comprises an active clutch disc, a passive clutch disc, an elastic piece and a connecting piece. In the electric tool, when the power component outputs power normally, the active clutch disc and the passive clutch disc of the power component can be in a combined state through the connecting piece, and the output component drives the batch head to work; when the power assembly reaches the maximum output power, the active clutch disc and the passive clutch disc can be separated from each other, so that the active clutch disc is in a free output state, and overload protection can be carried out on the power assembly.

Description

Electric tool

Technical Field

The utility model relates to the technical field of electric tools, in particular to an electric tool with an overload protection function.

Background

A power screw driver is a commonly used power tool, which is widely used for assembling and disassembling various workpieces. The current electric screw driver mainly comprises: batch head, output assembly, motor, etc. The motor drives the batch head to rotate through the output assembly so as to realize the disassembly and assembly of the workpiece.

When the electric screw driver actually works, the maximum output torque of the motor is constant. Therefore, when the torque required for disassembling and assembling the workpiece is larger than the maximum output torque of the motor, the electric screw driver is overloaded to work, and the electric screw driver is possibly damaged. Therefore, in view of the above problems, it is necessary to propose further solutions.

Disclosure of utility model

The utility model aims to provide an electric tool which overcomes the defects in the prior art.

In order to solve the technical problems, the technical scheme of the utility model is as follows:

a power tool, comprising: the clutch unit, the power assembly and the output assembly;

The clutch unit includes: the clutch comprises an active clutch disc, a passive clutch disc, an elastic piece and a connecting piece;

the disc surface of the active clutch disc is opposite to the disc surface of the passive clutch disc; the driving clutch disc is in transmission connection with the output end of the power assembly, and a plurality of grooves are further formed in the disc surface of the driving clutch disc;

The driven clutch disc is in transmission connection with the output assembly, and a plurality of through holes which are arranged corresponding to the grooves are also formed in the disc surface of the driven clutch disc;

The elastic piece is arranged between the passive clutch disc and the output assembly;

The connecting piece is arranged in any group of grooves and through holes in a penetrating way, one end of the connecting piece is matched with the grooves through inclined planes, and the other end of the connecting piece penetrates through the corresponding through holes and abuts against the elastic piece.

As an improvement of the electric tool, the grooves are hemispherical, and a plurality of hemispherical grooves are circumferentially distributed on the surface of the driving clutch disc at intervals.

As an improvement of the electric tool, the connecting piece is a cylinder, one end of the connecting piece matched with the groove is a convex arc surface, and the other end of the connecting piece extends out of the through hole and abuts against the elastic piece.

As an improvement of the electric tool, the connecting piece is a sphere, the sphere is partially embedded in the groove, the rest part of the sphere is embedded in the through hole, and the sphere extends out from the other side of the through hole and abuts against the axial pressure bearing.

As an improvement of the electric tool, the passive clutch disc is sleeved on one end of a connecting rod and is in transmission connection with the connecting rod, the other end of the connecting rod is in transmission connection with the output assembly, the elastic piece is a spring, the spring is sleeved on the connecting rod, and an axial pressure bearing is further arranged between the spring and the passive clutch disc.

As an improvement of the electric tool of the present utility model, the power assembly includes: a motor and a battery; the battery is used for supplying power to the motor, the output end of the motor is in transmission connection with the driving clutch disc, and an axial pressure bearing is further arranged between the output end of the motor and the driving clutch disc.

As an improvement of the power tool of the present utility model, the output assembly includes: the device comprises an output shaft, a positioning sleeve, a cylindrical pin and a shifting fork;

The output shaft is positioned in the positioning sleeve; the shifting fork is sleeved at one end of the output shaft and is in transmission connection with the connecting rod at the center of the driven clutch disc; the cylindrical pins are circumferentially distributed between the shifting fork and the output shaft at intervals; the other end of the output shaft is provided with a slot.

As an improvement of the electric tool of the utility model, the electric tool further comprises a housing; the shell comprises an inner shell and an outer shell;

The inner housing includes: a left front inner shell, a right front inner shell, a left rear inner shell, and a right rear inner shell; the left front inner shell and the right front inner shell are connected through an axial end face combination, the left rear inner shell and the right rear inner shell are connected through an axial end face combination, and the left front inner shell and the right front inner shell are integrally arranged at the front end of the left rear inner shell and the right rear inner shell which are integrally connected;

The outer housing includes: a front housing and a rear housing; the front shell is sleeved at the front part of the inner shell, and the rear shell is sleeved at the rear part of the inner shell.

As an improvement of the electric power tool of the present utility model, the electric power tool further includes an adjustment assembly including: an adjusting nut, a push block and a knob shell;

The push block is positioned in a space defined by the left front inner shell and the right front inner shell, the push block is propped against the elastic piece at the same time, a boss extending from the left front inner shell and the right front inner shell is arranged on the push block, a sliding groove suitable for the boss to extend is formed in the left front inner shell and/or the right front inner shell, the adjusting nut is in threaded connection with the left front inner shell and the right front inner shell, threads matched with the adjusting nut are arranged on the outer side walls of the left front inner shell and the right front inner shell, and the end face of the adjusting nut is propped against the extending boss; the knob shell is arranged at the front end of the outer shell, and the knob shell is sleeved on the adjusting nut.

The clutch unit includes: an active clutch plate and a passive clutch plate; the driving clutch disc is in transmission connection with the output end of the power assembly, and the driven clutch disc is in transmission connection with the output assembly;

The disc surface of the active clutch disc is matched with the disc surface of the passive clutch disc so as to drive the passive clutch disc to synchronously rotate; when the output torque of the power assembly reaches the upper output limit, the active clutch disc and the passive clutch disc are disengaged.

As an improvement of the electric tool of the utility model, the driving clutch disc and the driven clutch disc are matched through a connecting piece, and when the output torque of the power assembly reaches the upper output limit, the connecting piece is separated from the driving clutch disc or the driven clutch disc.

As an improvement of the electric tool, when the connecting piece is separated from the driving clutch disc, the acting force between the connecting piece and the driving clutch disc is smaller than the acting force corresponding to the moment when the output torque reaches the upper output limit; when the connecting piece is separated from the passive clutch disc, the acting force between the connecting piece and the passive clutch disc is smaller than the corresponding acting force when the output torque reaches the upper output limit.

Compared with the prior art, the utility model has the beneficial effects that: in the electric tool, when the power component outputs power normally, the active clutch disc and the passive clutch disc of the power component can be in a combined state through the connecting piece, and the output component drives the batch head to work; when the power assembly reaches the maximum output power, the active clutch disc and the passive clutch disc can be separated from each other, so that the active clutch disc is in a free output state, and overload protection can be carried out on the power assembly.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present utility model, and other drawings may be obtained according to the drawings without inventive effort to those skilled in the art.

FIG. 1 is a schematic perspective view of an embodiment of a power tool according to the present utility model;

FIG. 2 is an exploded perspective view of an embodiment of the power tool of the present utility model;

FIG. 3 is an enlarged perspective view of the passive clutch disc and connecting rod of FIG. 2;

fig. 4 is an enlarged perspective view of the adjustment assembly of fig. 2.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

As shown in fig. 1 and 2, the present embodiment provides a power tool including: clutch unit 10, power assembly 20, output assembly 30, housing 40, and adjustment assembly 50.

The clutch unit 10 is used for enabling the power assembly 20 to control the tool head 200 to work through the output assembly 30 during normal work; when the power assembly 20 reaches the maximum output power, the power assembly 20 and the output assembly 30 can be separated, so that overload protection is performed on the power assembly 20. Specifically, the clutch unit 10 includes: an active clutch disc 11, a passive clutch disc 12, an elastic member 13 and a connecting member 14.

One end of the driving clutch disc 11 is in transmission connection with the output end of the power assembly 20, and the end face of the other end forms the disc face of the driving clutch disc 11. One end of the passive clutch disc 12 is in transmission connection with the output assembly 30, and the end face of the other end forms the disc face of the passive clutch disc 12. The disc surface of the driving clutch disc 11 is opposite to the disc surface of the driven clutch disc 12. In order to facilitate the installation and fixation of the passive clutch disc 12, the passive clutch disc 12 is sleeved on a connecting rod 121, one end of the connecting rod 121 extends into a middle hole of the active clutch disc 11, and the other end is in transmission connection with the output assembly 30. Thus, the connecting rod 121 axially engages and disengages the passive clutch disc 12 with respect to the active clutch disc 11.

As shown in fig. 3, in order to realize the clutch between the disc surface of the active clutch disc 11 and the disc surface of the passive clutch disc 12, a plurality of grooves 111 are further arranged on the disc surface of the active clutch disc 11; correspondingly, a plurality of through holes 122 which are arranged corresponding to the plurality of grooves 111 are also arranged on the disc surface of the passive clutch disc 12. At this time, the connecting piece 14 is inserted into any one of the grooves 111 and the through holes 122, and one end of the connecting piece 14 is matched with the groove 111 through the inclined surface, and the other end passes through the corresponding through hole 122 and abuts against the elastic piece 13.

Thus, during normal operation of the power assembly 20, the driving clutch disc 11 can drive the driven clutch disc 12 to synchronously rotate through the connecting piece 14, and the driven clutch disc 12 can further control the tool head 200 to operate through the output assembly 30. When the power assembly 20 reaches the maximum output power, the external continuous reaction force is applied to the passive clutch disc 12, so that the connecting piece 14 slides out of the groove 111 of the active clutch disc 11, the separation of the active clutch disc 11 and the passive clutch disc 12 is realized, and the overload protection is further performed on the power assembly 20.

In order to facilitate the release of one end of the connecting element 14 from the groove 111 during overload operation, the groove 111 is designed as a hemisphere, and several hemispherical grooves 111 are circumferentially spaced on the disc surface of the driving clutch disc 11. So that the wall surface of the groove 111 acting with the connecting piece 14 is inclined, and the connecting piece 14 can slide out conveniently.

In cooperation with the hemispherical recess 111, the connecting member 14 is a cylinder, and one end of the cylinder, which cooperates with the recess 111, is a convex arc surface. Thus, when in overload operation, the end of the cylinder can be disengaged from the groove 111, since it is designed as an arc surface.

In another alternative embodiment, the connecting element 14 is a ball, which is partially embedded in the recess 111, and the remaining part is embedded in the through hole 122, and the ball protrudes from the other side of the through hole 122 and abuts against the axial pressure bearing 15. Thus, when the overload is operated, the ball can be separated from the groove 111 because the matching part of the ball and the groove 111 is designed as an arc surface.

The elastic piece 13 applies an elastic acting force to the connecting piece 14 through the axial pressure bearing 15, so that the connecting piece 14 can be always abutted against the disc surface of the driving clutch disc 11, and the driving clutch disc 11 and the driven clutch disc 12 can be always in a matched state when the power assembly 20 works normally. In one embodiment, the elastic member 13 is a spring, and the spring is sleeved on the connecting rod 121, and the axial pressure bearing is arranged between the spring and the passive clutch disc 12.

When the connecting member 14 is a cylinder, the other end of the cylinder protrudes from the through hole 122 and abuts against the elastic member 13, based on the embodiment described above. When the connecting member 14 is a ball, the ball extends out of the through hole 122 and abuts against the elastic member 13.

The power assembly 20 is used for providing power for the operation of the power tool of the present embodiment, and includes: a motor 21 and a battery 22. The battery 22 supplies power to the motor 21, an output end of the motor 21 is in transmission connection with the driving clutch disc 11, and an axial pressure bearing is further arranged between the output end of the motor 21 and the driving clutch disc 11.

The output assembly 30 is used for connecting an external working head, so that the working head is controlled to perform corresponding work under the driving of the power assembly 20. Wherein the output assembly 30 comprises: an output shaft 31, a positioning sleeve 32, a cylindrical pin 33 and a shifting fork 34. Specifically, the output shaft 31 is located in the positioning sleeve 32; the shifting fork 34 is sleeved at one end of the output shaft 31, and the shifting fork 34 is in transmission connection with a connecting rod 121 in the center of the driven clutch disc 12; cylindrical pins 33 are circumferentially spaced between the fork 34 and the output shaft 31; the other end of the output shaft 31 is provided with a slot.

Thus, when the passive clutch disc 12 rotates along with the active clutch disc 11, the passive clutch disc 12 drives the shifting fork 34 to synchronously rotate. And because the cylindrical pins 33 are circumferentially and alternately distributed between the shifting fork 34 and the output shaft 31, the shifting fork 34 drives the output shaft 31 to output power through each cylindrical pin 33. Correspondingly, the other end of the output shaft 31 has a slot adapted for the insertion of an external working head.

In addition, the power tool further includes a housing 40; the casing 40 includes an inner case 41 and an outer case 42. Wherein the inner housing 41 is located in the outer housing 42, and the clutch unit 10, the power assembly 20, and the output assembly 30 are integrated in a space defined by the inner housing 41. Specifically, the inner case 41 includes: a left front inner case 411, a right front inner case 412, a left rear inner case 413, a right rear inner case 414, and a limit cover 415; the left front inner shell 411 and the right front inner shell 412 are connected through axial end face combination, the left rear inner shell 413 and the right rear inner shell 414 are connected through axial end face combination, and the whole formed by the combination connection of the left front inner shell 411 and the right front inner shell 412 is arranged at the whole front end formed by the connection of the left rear inner shell 413 and the right rear inner shell 414. The positioning sleeve 32 is installed in the space defined by the left front inner shell 411 and the right front inner shell 412, and the inner sides of the left front inner shell 411 and the right front inner shell 412 are provided with steps for axially limiting the positioning sleeve 32, and a gasket 43 is further arranged between the positioning sleeve 32 and the steps.

The limiting cover 415 has an annular structure, and is fastened to the front ends of the left and right rear inner shells 413, 414, so as to realize rotation limiting of the left and right rear inner shells 413, 414. Correspondingly, the end faces of the limiting cover 415, which face the front ends of the left rear inner shell 413 and the right rear inner shell 414, are provided with structures matched with the left rear inner shell 413 and the right rear inner shell 414. In one embodiment, the structure is a limiting protrusion 4151 on the end surface, and the limiting protrusion 4151 is arranged in a central symmetry manner. Correspondingly, grooves 4131 capable of being matched with the limit protrusions 4151 are respectively arranged on the left rear inner shell 413 and the right rear inner shell 414. Meanwhile, the rear ends of the left and right front inner casings 411, 412 are inserted into the limit cover 415 to rotationally limit the left and right front inner casings 411, 412.

The outer case 42 includes: a front case 421 and a rear case 422; the front outer case 421 is sleeved on the front portion of the inner case 41, and the rear outer case 422 is sleeved on the rear portion of the inner case 41.

Referring to fig. 4, the adjusting component 50 is configured to adjust the maximum static friction between the active clutch disc 11 and the passive clutch disc 12, so as to separate the power component 20 from the output component 30 when the power component 20 reaches the maximum output power. The adjustment assembly 50 includes: an adjusting nut 51, a push block 52 and a knob housing 54.

The push block 52 is sleeved on the connecting rod 121, and the push block 52 is located in a space defined by the left front inner shell 411 and the right front inner shell 412. The push block 52 simultaneously abuts against a spring sleeved on the connecting rod 121. The push block 52 is provided with bosses 521 extending from the left and right front inner casings 411, 412 on both sides. Correspondingly, a sliding groove 4111 suitable for extending out of the boss 521 is formed on the left front inner shell 411 and/or the right front inner shell 412. The adjusting nut 51 is screwed to the left and right front inner casings 411 and 412. Correspondingly, the outer side walls of the left front inner shell 411 and the right front inner shell 412 are provided with threads matched with the adjusting nuts 51. The end face of the adjustment nut 51 abuts against the protruding boss 521.

The knob housing 54 is mounted on the front end of the outer housing 42, and the knob housing 54 is sleeved on the adjusting nut 51. The knob housing 54 is also provided with a rotation adjustment scale on the outer peripheral side. Thus, when the knob housing 54 is rotated in a predetermined direction, it can drive the adjustment nut 51 to rotate synchronously. At this time, the adjusting nut 51 can move axially, so as to drive the push block 42 to move close to the passive clutch disc 12. Thus, the push block 42 may compress the spring such that the spring compression adjusts the active clutch plate 11 and the passive clutch plate 12 to increase the maximum static friction therebetween. And the adjustment nut 51 is movable away from the push block 42 when the knob housing 54 is rotated in the opposite direction. Thus, the compressed spring releases the elastic force, thereby reducing the pressure applied to the passive clutch disc 12 to reduce the maximum static friction between the active clutch disc 11 and the passive clutch disc 12.

Therefore, the maximum output power of the power assembly 20 can be adapted by adjusting the maximum static friction force between the active clutch disc 11 and the passive clutch disc 12, so that when the power assembly 20 reaches the maximum output power, the active clutch disc 11 and the passive clutch disc 12 move relatively, and the power assembly 20 is separated from the output assembly 30, thereby achieving the purpose of protecting the power assembly 20.

Based on the same technical idea, another embodiment of the present utility model further provides an electric tool including: clutch unit 10, power assembly 20, and output assembly 30.

Wherein the clutch unit 10 includes: an active clutch plate 11 and a passive clutch plate 12; the driving clutch plate 11 is in transmission connection with the output end of the power assembly 20, and the driven clutch plate 12 is in transmission connection with the output assembly 30. To achieve the above purpose, the disc surface of the active clutch disc 11 is matched with the disc surface of the passive clutch disc 12 to drive the passive clutch disc 12 to rotate synchronously; when the output torque of the power assembly 20 reaches the upper output limit, the active clutch plate 11 is arranged to be able to disengage from the passive clutch plate 12.

In this way, the clutch unit 10 enables the power assembly 20 to control the tool head 200 to work through the output assembly 30 during normal work; when the power assembly 20 reaches the maximum output power, the power assembly 20 and the output assembly 30 can be separated, so that overload protection is performed on the power assembly 20.

In one embodiment, the active clutch plate 11 and the passive clutch plate 12 are engaged by the coupling member 14, and when the output torque of the power assembly 20 reaches the upper output limit, the coupling member 14 is disengaged from the active clutch plate 11 or the passive clutch plate 12. At this time, when the connecting member 14 is disengaged from the active clutch disc 11, the acting force between the connecting member 14 and the driven clutch disc 11 is smaller than the corresponding acting force when the output torque reaches the upper output limit; when the connecting member 14 is disengaged from the passive clutch disc 12, the force between the connecting member 14 and the passive clutch disc 12 is less than the corresponding force when the output torque reaches the upper output limit.

In summary, in the electric tool of the present utility model, when the power assembly outputs power normally, the active clutch disc and the passive clutch disc of the power assembly are in a combined state through the connecting piece, and the output assembly drives the screwdriver bit to work; when the power assembly reaches the maximum output power, the active clutch disc and the passive clutch disc can be separated from each other, so that the active clutch disc is in a free output state, and overload protection can be carried out on the power assembly.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims

1. An electric power tool, characterized in that the electric power tool comprises: the clutch unit, the power assembly and the output assembly;

2. The power tool of claim 1, wherein the recess is hemispherical, and a plurality of hemispherical recesses are circumferentially spaced apart on the face of the active clutch disc.

3. The power tool according to claim 1 or 2, wherein the connecting member is a cylinder, one end of the connecting member matched with the groove is a convex arc surface, and the other end of the connecting member extends out of the through hole and abuts against the elastic member.

4. The power tool according to claim 1, wherein the passive clutch disc is sleeved on one end of a connecting rod and is in transmission connection with the connecting rod, the other end of the connecting rod is in transmission connection with the output assembly, the elastic piece is a spring, the elastic piece is sleeved on the connecting rod, and an axial pressure bearing is further arranged between the spring and the passive clutch disc.

5. The power tool of claim 4, wherein the connector is a ball, the ball being partially embedded in the recess, the remainder being embedded in the through hole, the ball extending from the other side of the through hole and abutting the axial pressure bearing.

6. The power tool of claim 1, wherein the power assembly comprises: a motor and a battery; the battery is used for supplying power to the motor, the output end of the motor is in transmission connection with the driving clutch disc, and an axial pressure bearing is further arranged between the output end of the motor and the driving clutch disc.

7. The power tool of claim 1, wherein the output assembly comprises: the device comprises an output shaft, a positioning sleeve, a cylindrical pin and a shifting fork;

8. The power tool of claim 1, further comprising a housing; the shell comprises an inner shell and an outer shell;

9. The power tool of claim 8, further comprising an adjustment assembly comprising: an adjusting nut, a push block and a knob shell;

10. An electric power tool, characterized in that the electric power tool comprises: the clutch unit, the power assembly and the output assembly;

11. The power tool of claim 10, wherein the active clutch plate and the passive clutch plate cooperate via a coupling member that disengages from the active clutch plate or the passive clutch plate when the output torque of the power assembly reaches an upper output limit.

12. The power tool of claim 11, wherein when the connector is disengaged from the active clutch disc, the force between the connector and the active clutch disc is less than the corresponding force when the output torque reaches the upper output limit; when the connecting piece is separated from the passive clutch disc, the acting force between the connecting piece and the passive clutch disc is smaller than the corresponding acting force when the output torque reaches the upper output limit.