CN220699520U - Hand-held electric tool - Google Patents

Abstract

The utility model relates to a hand-held electric tool, which comprises a shell, a motor assembly, a transmission assembly, a switch assembly and a gear shifting assembly, wherein the switch assembly comprises a switch element and a trigger; the switch element comprises a gear lever movably connected to the switch main body, the gear shifting assembly comprises a connecting rod connected to a button, the button drives the gear shifting element to shift gears, and meanwhile, the gear shifting element is driven to move between a first position and a second position through the connecting rod, and when the gear shifting element is at the first position, the switch element outputs a first signal and controls the motor assembly to operate at a first motor rotating speed; in the second position, the switching element outputs a second signal and controls the motor assembly to operate at a second motor speed, the first motor speed being the same as the second motor speed in a direction of rotation. The utility model can meet the diversified work demands of users and has good user experience.

Description

Hand-held electric tool

[ field of technology ]

The utility model relates to the field of electric tools, in particular to a handheld electric tool for decoration, construction and other occasions.

[ background Art ]

A power tool is a type of apparatus in which a working head is driven by a motor assembly to reciprocate, and a planetary gear reduction device is typically provided between the motor assembly and the working head in order to convert a high-rotational-speed low-torque force of the motor assembly into a low-rotational-speed high-torque force required by a user. With the increasing demands of users, the handheld electric tools on the market at present, especially relate to straight shank type power tools, and a speed change device is arranged on a planetary gear speed reduction device, so that users can adjust the output rotating speed of the straight shank type power tools according to actual use demands. The transmission of a conventional straight shank power tool is provided with a high-speed gear and a low-speed gear, and is manually shifted by means of a shift mechanism.

The speed variator in the prior art can refer to Chinese patent No. 200920202451.8 published by 29 of 09 of 2010, which discloses a double-speed direct current straight shank type machine tool, comprising a gear box and a translational gear switching device connected with a speed change gear in the gear box, wherein a shift lever of the translational gear switching device penetrates out of a gear box shell, an axial waist-shaped hole is arranged on the gear box shell for the penetration and shift sliding of the shift lever, and a user can switch between a high speed gear and a low speed gear by moving the shift lever.

However, in the planetary gear reduction device in the prior art, when the design is intended to obtain a lower output rotation speed, a plurality of stages of planetary gears are required to reduce the speed, so that the whole volume of the electric tool is larger, and the development of miniaturization is not facilitated; in addition, based on a theoretical model of the planetary gear, the reduction ratio of each stage is 1+Z3/Z1, wherein Z3 is the number of teeth of the inner gear ring, Z1 is the number of teeth of the sun gear, and the reduction ratio of the planetary gear of each stage is not lower than 3; when designing straight shank formula instrument machine, if the rotational speed ratio of needs high-speed gear and low-speed gear is less than 3, traditional planetary gear reduction gear can't realize basically to can't satisfy user's diversified operation demand.

In view of the above, it is desirable to provide an improved hand-held power tool that overcomes the shortcomings of the prior art.

[ utility model ]

Aiming at the defects of the prior art, the utility model aims to provide a handheld electric tool with wider applicability and good user experience.

The utility model solves the problems in the prior art by adopting the following technical scheme: the hand-held electric tool comprises a shell, a motor component and a transmission component which are arranged on the shell, an output end driven by the transmission component, a switch component connected with the motor component and a gear shifting component movably connected with the transmission component, wherein the switch component comprises a switch element arranged on the shell and a trigger for triggering the switch element, the switch element controls the operation of the motor component, the gear shifting component comprises a gear shifting element connected with the transmission component and a button for moving the gear shifting element, the switch element comprises a switch main body arranged on the shell and a trigger piece movably connected with the switch main body, and the trigger is connected with the trigger piece so as to activate the switch element; the switch element comprises a gear lever movably connected with the switch main body, the gear shifting assembly comprises a connecting rod connected with the button, the connecting rod is connected with the gear lever, the button drives the gear shifting element to shift gears and simultaneously drives the gear lever to move between a first position and a second position through the connecting rod, and when the switch element is at the first position, the switch element outputs a first signal and controls the motor assembly to operate at a first motor rotating speed; in the second position, the switching element outputs a second signal and controls the motor assembly to operate at a second motor speed, the first motor speed and the second motor speed being the same in direction of rotation.

The further improvement scheme is as follows: the output end comprises a first state and a second state which run at different rotating speeds, the transmission assembly comprises an inner gear ring which is movably arranged, the button comprises a first gear corresponding to the first state and a second gear corresponding to the second state, the gear shifting element is connected between the inner gear ring and the button, and the button is moved to drive the output end to switch between the first state and the second state.

The further improvement scheme is as follows: the first state is a low-speed gear, the second state is a high-speed gear, and the gear lever is located at the first position when in the first state; and in the second state, the gear lever is positioned at the second position, and the second motor rotating speed is smaller than the first motor rotating speed.

The further improvement scheme is as follows: the end part of the baffle rod is provided with a connecting column, the connecting rod comprises an installation part connected to the end part and an installation hole penetrating through the installation part, and the connecting column is arranged in the installation hole in a penetrating mode.

The further improvement scheme is as follows: the transmission assembly and the switching element are positioned on the front side and the rear side of the motor assembly, and the connecting rod extends between the transmission assembly and the switching element.

The further improvement scheme is as follows: the trigger and the connecting rod are positioned on the upper side and the lower side of the motor assembly.

The further improvement scheme is as follows: the switch assembly includes a linkage assembly connected between the trigger and the switch element, the switch assembly triggering the switch element via the linkage assembly.

The further improvement scheme is as follows: the connecting rod assembly comprises a rotating rod abutting against the trigger piece and a straight rod abutting against the rotating rod and between the trigger, and the straight rod and the trigger piece are located on two sides of a pivot shaft of the rotating rod.

The further improvement scheme is as follows: the trigger piece and the gear lever are positioned on the same side of the switch main body.

Compared with the prior art, the utility model has the following beneficial effects: the second motor rotating speed in the high-speed gear state is smaller than the first motor rotating speed in the low-speed gear state, and the user presses the trigger in the high-speed gear state, so that the user can obtain lower rotating speed force even in the high-speed gear state because the motor rotating speed output by the motor assembly is limited, the limitation that the ratio of the rotating speed in the high-speed gear state to the rotating speed in the low-speed gear state is smaller than 3, which is not realized by the traditional planetary gear speed reduction device, is effectively broken through, and diversified working requirements of the user are met; in addition, when the user moves the trigger to shift gears, the connecting rod is used for linking the gear lever between the first position and the second position, and two functions of shifting gears and switching the rotating speed of the motor can be realized through one action, so that the possibility of misoperation is effectively reduced, and the user experience is improved.

[ description of the drawings ]

The following describes the embodiments of the present utility model in further detail with reference to the accompanying drawings:

FIG. 1 is a schematic diagram of a handheld power tool according to a preferred embodiment of the present utility model;

FIG. 2 is a schematic illustration of the entire hand-held power tool of FIG. 1 at an alternative angle;

FIG. 3 is a cross-sectional view of the hand-held power tool of FIG. 1, shown in a high gear position with the trigger not depressed;

FIG. 4 is a cross-sectional view of the hand-held power tool of FIG. 1, shown in a high gear condition with the trigger depressed;

FIG. 5 is a cross-sectional view of the hand-held power tool of FIG. 1, shown in a low gear state with the trigger not depressed;

FIG. 6 is a cross-sectional view of the hand-held power tool of FIG. 1, shown in a low gear condition with the trigger depressed;

FIG. 7 is a schematic diagram of a switching element of the hand-held power tool of FIG. 1;

FIG. 8 is a schematic view of another angle configuration of the switching element of FIG. 7;

FIG. 9 is a schematic illustration of a shift assembly of the hand-held power tool of FIG. 1;

FIG. 10 is a schematic illustration of the connection of the shift assembly and the switching element in the hand held power tool of FIG. 1;

FIG. 11 is a schematic view of another angular connection of the shift assembly and the switch element illustrated in FIG. 10.

[ detailed description ] of the utility model

The utility model will be described in further detail with reference to the drawings and embodiments.

The terminology used in the present utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The words such as "upper", "lower", "front", "rear", "left", "right", etc., indicating an azimuth or a positional relationship are merely based on the azimuth or the positional relationship shown in the drawings, and are merely for convenience of description and to simplify the description, and do not indicate or imply that the devices/elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present utility model.

Referring to fig. 1 to 3, a hand-held power tool according to a preferred embodiment of the present utility model is a direct-current power-supplied straight shank type machine tool 100, and the end of the straight shank type machine tool 100 can be adapted to different types of tool heads for screwing or unscrewing screws, punching holes in a wall surface, inflating tires, polishing and polishing, etc. The straight shank type machine tool 100 comprises a machine shell 1, a motor assembly 2 and a transmission assembly 3 which are arranged in the machine shell 1, a switch assembly 4 connected with the motor assembly 2, a gear shifting assembly 5 movably connected with the transmission assembly 3, an output end 20 driven by the transmission assembly 3, a control assembly 6 for controlling the motor assembly 2 and a battery pack 200 for supplying power to the motor assembly 2, wherein the battery pack 200 is detachably arranged in the machine shell 1 so as to facilitate the battery pack 200 to charge; specifically, the switch assembly 4 is electrically connected to the control assembly 6, and the user presses the switch assembly 4 to start the motor assembly 2 to rotate, and transmits force to the output end 20 via the transmission assembly 3, so that the tool bit is clamped on the output end 20, and the work can be performed on the workpiece.

Referring to fig. 3, the transmission assembly 3 is a planetary gear reduction mechanism, and is adapted to convert the high-rotation-speed and low-torque force output by the motor assembly 2 into a low-rotation-speed and high-torque force required by a user. In order to meet the diversified demands of users, the output end 20 includes a first state and a second state running at different rotational speeds, and the planetary gear reduction mechanism has a movably disposed ring gear 31. Wherein, the first state is a low gear state, and the inner gear ring 31 participates in the deceleration process, and the output end 20 runs at a low rotation speed; the second state is a high gear state, in which the ring gear 31 is disengaged and does not participate in the deceleration process, and the output 20 operates at a high rotational speed, which is higher in the high gear state than in the low gear state.

Further, the shift assembly 5 is connected to the ring gear 31 of the planetary gear reduction mechanism, and when the user moves the shift assembly 5, the ring gear 31 can be driven to move, so as to switch between the first state and the second state.

Referring to fig. 1 and 2, the casing 1 includes a main body 11 for accommodating the motor assembly 2 and the transmission assembly 3, and a coupling portion 12 connected to a rear end of the main body 11, an output end 20 extends to a front end of the main body 11, a holding portion 13 for holding by a user is formed on an outer periphery of the main body 11, a battery pack 200 is detachably mounted on a lower side of the coupling portion 12, the shift assembly 5 is disposed on a lower side of the main body 11 and adjacent to the output end 20, the switch assembly 4 is disposed on an upper side of the main body 11, and the control assembly 6 is disposed in the main body 11 and between the motor assembly 2 and the battery pack 200.

Further, the holding portion 13 is located between the gear shifting unit 5 and the battery pack 200, and the switch unit 4 extends at least partially between the gear shifting unit 5 and the battery pack 200, so that the user can press the switch unit 4 and move the gear shifting unit 5 back and forth to perform a gear shifting operation while holding the holding portion 13 with the whole palm of the user, thereby realizing one-hand operation and being more comfortable and convenient to operate.

In the present embodiment, the battery pack 200 is detachably mounted to the coupling portion 12, the motor assembly 2 has the first axis 300 extending in the front-rear direction, and the plugging direction of the battery pack 200 is substantially the same as the extending direction of the first axis A1.

Alternatively, the nominal voltage of the battery pack 200 may be 10V or more and 20V or less, for example, the nominal voltage of the battery pack 200 may be 12V, 18V, 20V, or the like; alternatively, the nominal voltage of the battery pack 200 may be 20V or more and 100V or less, for example, the nominal voltage of the battery pack 200 may be 24V, 40V, 56V, 80V, or the like.

Alternatively, the number of the battery cells included in one battery cell group in the battery pack 200 may be 3 or more and 5 or less, for example, the number of the battery cells included in one battery cell group may be 3, 4 or 5. Alternatively, the number of the battery cells included in one battery cell group in the battery pack 200 may be 6 or more and 25 or less, for example, the number of the battery cells included in one battery cell group may be 6, 10, 14, 20, or the like.

Referring to fig. 3 to 6, the switch assembly 4 includes a switch element 41 mounted on the casing 1, a trigger 42 for triggering the switch element 41, a link assembly connected between the trigger 42 and the switch element 41, and a self-locking member 47 mounted on the trigger 42, wherein the switch element 41 controls the operation of the motor assembly 2, and the switch assembly 4 triggers the switch element 41 via the link assembly, i.e. the trigger 42 indirectly triggers the switch element 41 via the link assembly.

In the present embodiment, the link assembly includes a rotating rod 43 abutting against the switch element 41, a straight rod 44 abutting against between the rotating rod 43 and the trigger 42, and a guide rail 45 supporting the straight rod 44, the straight rod 44 extends substantially in the up-down direction, the guide rails 45 are two and are arranged at intervals in the up-down direction, and the straight rod 44 moves under the guidance of the pair of guide rails 45 to ensure the movement stability of the straight rod 44.

In the present embodiment, the straight lever 44 and the switching element 41 are respectively abutted against both sides of the pivot shaft 431 of the rotation lever 43.

Further, the trigger 42 is a long rod trigger and pivots around a pivot 46, and by pressing the trigger 42, a user drives the straight rod 44 to move up and down along the pair of guide rails 45 and to press against one end of the rotating rod 43, so as to drive the rotating rod 43 to rotate around the pivot 431, the other end of the rotating rod 43 triggers and activates the switching element 41, and the switching element 41 activates the motor assembly 2.

In the present embodiment, the self-locking member 47 has a third state (refer to fig. 3) in which the movement of the trigger 42 is restricted and a fourth state (refer to fig. 4) in which the movement of the trigger 42 is not restricted, and the self-locking member 47 can effectively prevent the false triggering of the straight shank type machine tool 100, and effectively ensure the use safety of the user.

As shown in fig. 3 and 4, in the third state, one end of the self-locking member 47 abuts against the outer wall of the casing 1, and the user moves the other end of the self-locking member 47, so that the self-locking member 47 rotates to switch from the third state to the fourth state.

As shown in fig. 9 and 10, the above-mentioned shift assembly 5 includes a shift element 51 connected to the ring gear 31 of the transmission assembly 3 and a button 52 for moving the shift element 51, the button 52 includes a first gear corresponding to a first state and a second gear corresponding to a second state, the shift element 51 is connected between the ring gear 31 and the button 52, the button 52 is moved back and forth by a user, and the shift element 51 is linked to drive the ring gear 31 to move, so as to drive the output end 20 to switch between the first state and the second state.

In the present embodiment, the lower end of the button 52 protrudes outside the casing 1 for the user to perform a moving operation.

Referring to fig. 3 and 4, the transmission assembly 3 and the switching element 41 are disposed on both front and rear sides of the motor assembly 2, and the link 53 extends between the transmission assembly 3 and the switching element 41.

Further, the trigger 42 and the link 53 are located on both upper and lower sides of the motor assembly 2.

Referring to fig. 7 to 11, the switch element 41 includes a switch main body 411 mounted on the housing 1, a trigger 412 movably connected to the switch main body 411, and a lever 413, wherein the trigger 42 is connected to the trigger 412 to activate the switch element 41; the gear shift assembly 5 comprises a connecting rod 53 connected to a button 52, the connecting rod 53 is connected to a gear lever 413, the button 52 drives the gear shift element 51 to shift gears, and meanwhile, the gear lever 413 is driven to move between a first position and a second position by the connecting rod 53, and when in the first position, the switch element 41 outputs a first signal and controls the motor assembly 2 to operate at a first motor rotation speed; in the second position, the switching element 41 outputs a second signal and controls the motor assembly 2 to operate at a second motor speed, and the first motor speed and the second motor speed are turned the same and the speeds are different.

In this embodiment, the switch element 41 is electrically connected to the control unit 6, and the lever 413 is configured to realize two different signal outputs by contacting an internal metal reed with different resistors, and the control unit 6 receives different signals and then controls the motor unit 2 to operate at different motor speeds.

In the present embodiment, the rotating lever 43 abuts against the trigger 412, and the straight lever 44 and the trigger 412 are located on both sides of the pivot shaft 431 of the rotating lever 43.

In the present embodiment, the trigger 412 and the lever 413 are located on the same side of the switch body 411.

In the present embodiment, the link 53 and the button 52 are integrally formed.

Further, the first state is a low gear, the second state is a high gear, and the lever 413 is located at the first position in the first state; in the second state, the lever 413 is in the second position and the second motor speed is less than the first motor speed. Thus, when the lever 413 is in the second position, the motor rotation speed of the motor assembly 2 is limited, and in actual use, the output end 20 can output a lower force of rotation speed required by the user to meet the requirements of different working situations of the user.

In addition, since the first state is a low-speed gear state and the second state is a high-speed gear state, based on a theoretical model of the planetary gear, the reduction ratio of each stage is 1+z3/Z1, wherein Z3 is the number of teeth of the ring gear, Z1 is the number of teeth of the sun gear, the reduction ratio of each stage of the planetary gear is not lower than 3, and if the ratio of the rotation speed in the high-speed gear state to the rotation speed in the low-speed gear state is required to be less than 3, the conventional planetary gear reduction device cannot be basically realized; in this embodiment, the second motor rotation speed in the high-speed gear state is less than the first motor rotation speed in the low-speed gear state, and the user presses the trigger 42 in the high-speed gear state, so that the user can obtain a lower rotation speed force even in the high-speed gear state because the motor rotation speed output by the motor assembly 2 is limited, the limitation that the ratio of the rotation speed in the high-speed gear state to the rotation speed in the low-speed gear state is less than 3, which is not realized by the conventional planetary gear reduction device, is effectively broken, and the diversified working demands of the user are satisfied.

As shown in fig. 10 and 11, the end of the lever 413 is provided with a first connection portion, the end of the connecting rod 53 is provided with a second connection portion, and the first connection portion is connected to the second connection portion, so that when the user moves the trigger 42 to shift gears, the lever 413 is linked to move between the first position and the second position via the connecting rod 53, that is, the user can realize two functions of shifting gears and switching the rotation speed of the motor through one action, thereby effectively reducing the possibility of misoperation and improving the user experience.

Specifically, the first connection portion is a connection post 414 protruding from an end of the lever 413, and the second connection portion includes a mounting portion 54 connected to an end of the link 53 and a mounting hole 55 penetrating the mounting portion 54, and the connection post 414 is inserted into the mounting hole 55.

In the utility model, the second motor rotating speed in the high-speed gear state is smaller than the first motor rotating speed in the low-speed gear state, and the user presses the trigger 42 in the high-speed gear state, so that the user can obtain lower rotating speed force even in the high-speed gear state because the motor rotating speed output by the motor assembly 2 is limited, the limitation that the conventional planetary gear speed reduction device cannot realize that the rotating speed ratio of the high-speed gear state to the low-speed gear state is smaller than 3 is effectively broken, and the diversified working demands of the user are met.

The present utility model is not limited to the above-described embodiments. Those skilled in the art will readily appreciate that many other alternatives to the hand-held power tool of the present utility model are possible without departing from the spirit and scope of the present utility model. The protection scope of the present utility model is subject to the claims.

Claims (9)

1. The hand-held electric tool comprises a shell, a motor component and a transmission component which are arranged on the shell, an output end driven by the transmission component, a switch component connected with the motor component and a gear shifting component movably connected with the transmission component, wherein the switch component comprises a switch element arranged on the shell and a trigger for triggering the switch element, the switch element controls the operation of the motor component, the gear shifting component comprises a gear shifting element connected with the transmission component and a button for moving the gear shifting element, the switch element comprises a switch main body arranged on the shell and a trigger piece movably connected with the switch main body, and the trigger is connected with the trigger piece so as to activate the switch element; the method is characterized in that: the switch element comprises a gear lever movably connected with the switch main body, the gear shifting assembly comprises a connecting rod connected with the button, the connecting rod is connected with the gear lever, the button drives the gear shifting element to shift gears and simultaneously drives the gear lever to move between a first position and a second position through the connecting rod, and when the switch element is at the first position, the switch element outputs a first signal and controls the motor assembly to operate at a first motor rotating speed; in the second position, the switching element outputs a second signal and controls the motor assembly to operate at a second motor speed, the first motor speed and the second motor speed being the same in direction of rotation.

2. The hand-held power tool of claim 1, wherein: the output end comprises a first state and a second state which run at different rotating speeds, the transmission assembly comprises an inner gear ring which is movably arranged, the button comprises a first gear corresponding to the first state and a second gear corresponding to the second state, the gear shifting element is connected between the inner gear ring and the button, and the button is moved to drive the output end to switch between the first state and the second state.

3. The hand-held power tool of claim 2, wherein: the first state is a low-speed gear, the second state is a high-speed gear, and the gear lever is located at the first position when in the first state; and in the second state, the gear lever is positioned at the second position, and the second motor rotating speed is smaller than the first motor rotating speed.

4. The hand-held power tool of claim 1, wherein: the end part of the baffle rod is provided with a connecting column, the connecting rod comprises an installation part connected to the end part and an installation hole penetrating through the installation part, and the connecting column is arranged in the installation hole in a penetrating mode.

5. The hand-held power tool of claim 1, wherein: the transmission assembly and the switching element are positioned on the front side and the rear side of the motor assembly, and the connecting rod extends between the transmission assembly and the switching element.

6. The hand-held power tool of claim 5, wherein: the trigger and the connecting rod are positioned on the upper side and the lower side of the motor assembly.

7. The hand-held power tool of claim 1, wherein: the switch assembly includes a linkage assembly connected between the trigger and the switch element, the switch assembly triggering the switch element via the linkage assembly.

8. The hand-held power tool of claim 7, wherein: the connecting rod assembly comprises a rotating rod abutting against the trigger piece and a straight rod abutting against the rotating rod and between the trigger, and the straight rod and the trigger piece are located on two sides of a pivot shaft of the rotating rod.

9. The hand-held power tool of claim 8, wherein: the trigger piece and the gear lever are positioned on the same side of the switch main body.