CN217904200U - Electric tool - Google Patents

Abstract

The utility model relates to an electric tool, include: the device comprises a shell, a motor and an output shaft, wherein the motor and the output shaft are positioned in the shell; the electric tool is provided with a speed adjusting mechanism which is positioned between the output shaft and the output end of the motor, the speed adjusting mechanism comprises a sleeve and a rotary sleeve, the sleeve is provided with an adjusting cup and an induction element, the induction element is accommodated in the sleeve, the induction element comprises a Hall plate adjacent to the motor and a magnet embedded in the adjusting cup, the Hall plate is internally provided with Hall elements distributed along the circular arc of the Hall plate, and the rotation of the magnet and the Hall elements realize the disconnection and the conduction of electric signals. The output rotating speed is adjusted through the electronic mechanism of the sensing element, so that the space of the electric tool can be saved.

Description

Electric tool

[ technical field ]

The utility model relates to an electric tool field, in particular to an electric tool that is used for polishing, rust cleaning, polishing etc. operation processing to the work piece.

[ background art ]

In the prior art, in order to enable a handheld electric tool to have multi-gear rotating speed, a part of handheld electric tools use a microswitch to trigger a control board to send a command to a motor for speed regulation, however, the scheme has the following defects: only the mode of mechanical speed regulation is adopted for realizing, so that the speed change device is complex, the size is long, the number of corresponding used parts is large, the weight is heavy, the size of the corresponding electric tool is large, the manufacturing cost is high, and the use requirement of people on the electric tool cannot be met.

Accordingly, there is a need for an improved power tool that overcomes the deficiencies of the prior art.

[ contents of utility model ]

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model discloses an aim at provides the electric tool of adjustable speed.

The utility model provides a technical scheme that prior art problem adopted is: the device comprises a shell, a motor and an output shaft, wherein the motor and the output shaft are positioned in the shell, one end of the output shaft is connected with the output end of the motor, and the other end of the output shaft penetrates out of the shell to be connected with a working head; the electric tool is provided with a speed adjusting mechanism positioned between the output shaft and the output end of the motor, the speed adjusting mechanism comprises a sleeve, a rotating sleeve arranged on the sleeve, an adjusting cup and an induction element accommodated in the sleeve, the induction element comprises a Hall plate adjacent to the motor and a magnet embedded in the adjusting cup, hall elements distributed along the circular arc of the Hall plate are placed in the Hall plate, and the rotation of the magnet and the Hall elements realize the disconnection and the conduction of electric signals.

The further improvement scheme is as follows: the speed adjusting mechanism also comprises a sun wheel connected with the output end of the motor, a plurality of planet wheels meshed with the sun wheel and an inner gear ring surrounding the peripheries of the planet wheels.

The further improvement scheme is as follows: the sleeve is sleeved on the inner gear ring, the sleeve is provided with a sliding groove in the peripheral wall and a speed regulating part accommodated in the sliding groove, the speed regulating part is connected with the inner gear ring, and the speed regulating part moves along the sliding groove to drive the inner gear ring to move axially.

The further improvement scheme is as follows: the ring gear has a first position and a second position that are axially movable; when the output shaft is in the first or second speed state, the inner gear ring is meshed with the sun gear and the planet gear simultaneously; and in the second position, the inner gear ring is meshed with the planet gear and is separated from the sun gear, and the output shaft is in a third or fourth speed state at the moment.

The further improvement scheme is as follows: the sun wheel comprises a gear disc and a gear shaft, wherein teeth are arranged on the outer peripheral surfaces of the gear disc and the gear shaft, the gear disc is meshed with the inner gear ring, and the gear shaft is meshed with the planet wheel.

The further improvement scheme is as follows: the speed adjusting mechanism comprises a planet carrier positioned between the planet wheel and the output shaft, the planet wheel is rotatably arranged at the rear end of the planet carrier through a pin, and the front end of the planet carrier is connected with the output shaft.

The further improvement scheme is as follows: the sleeve is provided with a pair of sliding grooves which are located on the peripheral wall and are centrosymmetric, the sliding grooves comprise speed sections which are arranged along the circumferential direction of the sleeve, and each speed section comprises a first speed section and a third speed section which are parallel to each other, a second speed section which is located between the first speed section and the third speed section and a fourth speed section which is located at the tail of the third speed section.

The further improvement scheme is as follows: the speed regulating part comprises a speed regulating steel wire, the speed regulating steel wire is a semicircular ring body and is provided with a wing part formed by bending two ends outwards, the peripheral wall of the inner gear ring is provided with an accommodating groove for accommodating the speed regulating steel wire, and the speed regulating steel wire is clamped in the accommodating groove.

The further improvement scheme is as follows: the wing part of the speed regulating steel wire is arranged in the sliding groove in a sliding mode, and the wing part of the speed regulating steel wire penetrates through the sliding groove to be connected and fixed to the inner wall of the regulating cup.

The further improvement scheme is as follows: when the wing part of the speed regulating steel wire slides to the first speed section or the fourth speed section, the magnet is positioned in the induction range of the Hall element.

Compared with the prior art, the utility model discloses following beneficial effect has: the magnet is rotated when the adjusting cup is rotated, and the rotation of the magnet and the Hall element realize the disconnection and the conduction of the electric signal, so that the motor is controlled to adjust different rotating speeds, the space can be saved, and the maximum output capacity of the motor can be ensured; in addition, a mechanical speed regulating device is further added, so that the regulating cup drives the speed regulating steel wire to slide along the sliding groove, the speed regulating steel wire drives the inner gear ring to axially move to switch among a first speed section, a second speed section, a third speed section and a fourth speed section, and the maximum output capacity of the motor and the heavy-load working condition are guaranteed by simultaneously regulating the output rotating speed through a mechanical mechanism and an electronic mechanism.

[ description of the drawings ]

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings:

FIG. 1 is an exploded view of a power tool according to a preferred embodiment of the present invention;

FIG. 2 is a side view of the sleeve shown in FIG. 1;

FIG. 3 is a schematic view of the external structure of the sleeve shown in FIG. 1;

FIG. 4 is a cross-sectional view of the adjustment cup of FIG. 1;

fig. 5 is a cross-sectional view of the hall plate shown in fig. 1.

The meaning of the reference symbols in the figures:

10. casing 11, motor 12, hall board

121. Hall element 122, hall element 13 and motor connecting disc

131. Pin 14, sun gear 141, gear plate

142. Gear shaft 15, speed regulating steel wire 16 and inner gear ring

161. End tooth 17, planet wheel 18 and planet carrier

19. Adjusting cup 20, magnet 21 and sleeve

211. Chute 2111, low-speed section 2112 and medium-speed section

2113. Middle and high speed section 2114, high speed section 22 and output shaft

[ detailed description of the invention ]

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.

Referring to fig. 1, the electric tool according to a preferred embodiment of the present invention has a housing 10, and the housing 10 is assembled by folding two half-shells that are symmetrical up and down or symmetrical left and right. The casing 10 can be held by a user, one end of the casing 10 where the working head is located is a front end, the other end is a rear end, and a power source, a motor 11, a speed adjusting mechanism and an output shaft 22 are sequentially arranged in the casing 10 from the rear to the front. The power source adopts a battery or a plug-in peripheral power supply to supply power for the motor 11. The motor 11 is used for driving the output shaft 22 to rotate relative to the casing 10, the speed adjusting mechanism is used for realizing speed adjustment between the motor 11 and the output shaft 22, and the output shaft 22 is used for outputting torsion under the driving of the speed adjusting mechanism. The front end of the output shaft 22 extends from the front end of the housing 10, and the extending end is provided with a work chuck for respectively clamping different work heads when the tool performs different functions, so as to be applied in different ranges. For example, a grinding wheel head for performing a grinding function, a cloth wheel, a felt wheel, etc. for performing a polishing function, which will not be described in detail herein for space. The utility model discloses the electric tool product that preferred embodiment provided compact structure satisfies miniaturized design.

Referring to fig. 1 and 2, as an implementation manner, the speed adjustment mechanism includes a sleeve 21, an adjustment cup 19 rotatably sleeved on the sleeve 21, and an induction element accommodated in the sleeve 21, where the induction element includes a hall plate 12 adjacent to the motor 11 and a magnet 20 embedded in the adjustment cup 19, hall elements 121 and 122 distributed along an arc of the hall plate 12 are placed in the hall plate 12, and the rotation of the magnet 20 and the hall elements 121 and 122 realize disconnection and conduction of an electrical signal.

As another possible embodiment, the speed adjustment mechanism further includes a sun gear 14, planet gears 17, and an annulus gear 16. The sun gear 14 is composed of a gear plate 141 and a gear shaft 142 which are coaxially arranged, the motor connecting plate 13 is positioned between the sun gear 14 and the motor 11, and a pair of pins 131 for positioning the induction element are arranged on the inner side of the motor connecting plate 13. The output end of the motor 11 is inserted into a connecting hole in the center of the gear plate 141 to drive the sun gear 14 to rotate. The gear disc 141 and the gear shaft 142 are provided with teeth on the outer peripheral surfaces thereof, a plurality of planet wheels 17 form a planet wheel set to be meshed with the gear shaft 142, and the ring gear 16 surrounds the planet wheel set and the gear disc 141. The planet gears 17 are rotatably mounted to the rear end of the planet carrier 18 by pins 181, and the front end of the planet carrier 18 is connected to the output shaft 22.

Referring to fig. 3, a pair of sliding grooves 211 which are symmetrical in the center and stepped are formed in the circumferential wall of the sleeve 21, and each sliding groove 211 comprises a speed section which is arranged along the circumferential direction of the sleeve 21 and comprises a first speed section 2111 and a third speed section 2113 which are parallel to each other, a second speed section 2112 which is offset between the first speed section 2111 and the third speed section 2113, and a fourth speed section 2114 which is located at the end of the third speed section 2113. Referring to fig. 2, the first speed segment 2111 is from a to B and does not include B, the second speed segment 2112 is from B to C and does not include C, the third speed segment 2113 is from C to D and does not include D, and the fourth speed segment 2114 is D and beyond.

The governor member moves along the slide groove 211 to move the ring gear 16 axially. The speed regulation part comprises a speed regulation steel wire 15, the speed regulation steel wire 15 is a semicircular ring body, the peripheral wall of the inner gear ring 16 is provided with an accommodating groove for accommodating the semicircular ring body, two ends of the semicircular ring body are bent outwards to form wing parts, the wing parts are arranged in the sliding groove 211 in a sliding mode, and the wing parts of the speed regulation steel wire 15 penetrate through the sliding groove 211 and are connected to the inner wall of the regulation cup 19.

Referring to fig. 4 and 5, the sensing element includes a hall plate 12 adjacent to the motor 11 and a magnet 20 embedded in the adjustment cup 19, an arc hall groove is disposed at an inner circumference of the hall plate 12, and hall elements 121 distributed along an arc are disposed in the hall groove. When the magnet 20 in the adjusting cup 19 rotates, the hall element senses the rotation of the magnet 20, and the rotation of the magnet 20 and the hall element realize the disconnection and connection of the electric signal.

Gear marks corresponding to low rotation speed, medium rotation speed and high rotation speed can be arranged on the outer peripheral wall of the adjusting cup 19. When the rotary adjusting cup 19 rotates from a low gear to a middle gear, the wing part of the speed regulating steel wire 15 moves along the first speed section 2111, the magnet 20 is in the induction range of the hall element 121, the hall element sends a signal to the hall plate, the hall plate controls the rotating speed of the motor, the output shaft 22 is in a low rotating speed state, and the inner gear ring 16 has an axial first position; when the wing part of the speed-regulating steel wire 15 reaches the position B, the output shaft 22 has the second speed, namely the middle rotating speed, at the moment, the magnet 20 is not in the sensing range of the Hall element 121, and the inner gear ring still has the first axial position; the wing part of the speed-regulating steel wire 15 continues to move to the third speed section 2113 along the second speed section 2112, the wing part moves backward along the axial direction relative to the machine shell 10, namely, the wing part drives the inner gear ring 16 to move backward along the axial direction to the second position, so that the end tooth 161 of the inner gear ring 16 is disengaged from the machine shell, at this time, the inner gear ring 16 can rotate and simultaneously engage with a gear disc and a planetary gear set of the sun gear 14, the planetary gear 17 and the inner gear ring 16 are in a synchronous transmission state, and the output shaft 22 is in a medium-high rotation speed state at this time. When the rotary adjusting cup 19 rotates from a middle gear to a high gear, the wing part of the speed adjusting steel wire 15 moves along the third speed section 2113, when the rotary adjusting cup reaches a position D, namely the fourth speed section 2114, the magnet 20 is in the sensing range of the Hall element 122, the Hall element sends a signal to the Hall plate, the Hall plate controls the rotating speed of the motor, the output shaft 22 is in a high rotating speed state, and the inner gear ring 16 still has an axial second position.

As with the above principle, when the rotation adjusting cup 19 rotates from a high gear to a medium-high gear, the wing part of the speed adjusting steel wire 15 moves along the sliding slot 2113, the magnet 20 is not in the sensing range of the hall element 122, mechanical speed adjustment is performed, and the inner gear ring has an axial second position; when the rotary adjusting cup 19 rotates from a middle gear to a middle gear, the wing part of the speed adjusting steel wire 15 moves along the sliding groove 2112, the wing part moves forwards along the axial direction relative to the machine shell 10, namely, the wing part drives the inner gear ring 16 to move forwards axially to the first position, so that the end teeth 161 of the inner gear ring 16 are locked by the machine shell in the circumferential direction and do not rotate any more, and the inner gear ring 16 is meshed with the planet wheels 17 but is separated from the gear disc of the sun wheel 14. Therefore, the decelerated rotation output rotation speed is transmitted to the output shaft 22 via the carrier 18, and then the intermediate rotation speed state of the output shaft 22 is established. When the rotary adjusting cup 19 rotates from the middle gear to the low gear, the wing part of the speed regulating steel wire 15 moves along the sliding groove 2111, the magnet 20 is in the sensing range of the hall element 121, electronic speed regulation is performed at the moment, the hall plate comprises a controller, and after the controller receives a signal, the speed of the motor is controlled to change, so that the low-rotation-speed state of the output shaft is formed, and the inner gear ring 16 is still in the first position at the moment.

In addition, it is possible to modify the speed adjustment mechanism to provide more different rotational speed outputs. For example, set up multistage planet wheel and ring gear, can provide three at least rotational speed outputs, for example again, place three, four and above hall element on the hall board, can additionally newly-increased three, four and above rotational speed outputs on the basis of three kinds of rotational speed outputs that mechanical speed governing provided in the front, its specific setting and compound mode are that technical personnel in the field are the basis of this utility model discloses the thought and the easy design that designs out that describe, do not give unnecessary detail here.

Compared with the prior art, the speed regulation is realized only by mechanical regulation, and the electric signal is disconnected and conducted only by the rotation of the magnet and the Hall element by adopting the electronic speed regulation of the induction element, so that the rotating speed of the motor is controlled to control the rotating speed of the output shaft, the structure of the inner gear train is simplified, and the size of the regulating mechanism is reduced; in addition, if a mode of combining electronic speed regulation and mechanical speed regulation is adopted simultaneously, the rotating speed difference between different gears of the speed regulating mechanism is reduced, the using appropriateness of different working conditions can be improved, the maximum output capacity of the motor is ensured, the heavy-load working condition is met, and the operation quality of the electric tool is improved.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A power tool, comprising: the device comprises a shell, a motor and an output shaft, wherein the motor and the output shaft are positioned in the shell, one end of the output shaft is connected with the output end of the motor, and the other end of the output shaft penetrates out of the shell to be connected with a working head; the method is characterized in that: the electric tool is provided with a speed adjusting mechanism which is positioned between the output shaft and the output end of the motor, the speed adjusting mechanism comprises a sleeve and a rotary sleeve, the sleeve is provided with an adjusting cup and an induction element, the induction element is accommodated in the sleeve, the induction element comprises a Hall plate adjacent to the motor and a magnet embedded in the adjusting cup, the Hall plate is internally provided with Hall elements distributed along the circular arc of the Hall plate, and the rotation of the magnet and the Hall elements realize the disconnection and the conduction of electric signals.

2. The power tool of claim 1, wherein: the speed adjusting mechanism further comprises a sun gear connected with the output end of the motor, a plurality of planet gears meshed with the sun gear and an inner gear ring surrounding the peripheries of the planet gears.

3. The power tool of claim 2, wherein: the sleeve is sleeved on the inner gear ring and provided with a chute on the peripheral wall and a speed regulating part accommodated in the chute, the speed regulating part is connected with the inner gear ring, and the speed regulating part moves along the chute to drive the inner gear ring to axially move.

4. The power tool of claim 2, wherein: the ring gear has a first position and a second position that are axially movable; when the output shaft is in the first or second speed state, the inner gear ring is meshed with the sun gear and the planet gear simultaneously; and in the second position, the inner gear ring is meshed with the planet gear and is separated from the sun gear, and the output shaft is in a third or fourth speed state at the moment.

5. The power tool of claim 2, wherein: the sun wheel comprises a gear disc and a gear shaft, wherein teeth are arranged on the outer peripheral surfaces of the gear disc and the gear shaft, the gear disc is meshed with the inner gear ring, and the gear shaft is meshed with the planet wheel.

6. The power tool of claim 2, wherein: the speed adjusting mechanism comprises a planet carrier positioned between the planet wheel and the output shaft, the planet wheel is rotatably arranged at the rear end of the planet carrier through a pin, and the front end of the planet carrier is connected with the output shaft.

7. The power tool of claim 3, wherein: the sleeve is provided with a pair of sliding grooves which are located on the peripheral wall and are centrosymmetric, the sliding grooves comprise speed sections which are arranged along the circumferential direction of the sleeve, and each speed section comprises a first speed section and a third speed section which are parallel to each other, a second speed section which is located between the first speed section and the third speed section and a fourth speed section which is located at the tail of the third speed section.

8. The power tool of claim 7, wherein: the speed regulating part comprises a speed regulating steel wire, the speed regulating steel wire is a semicircular ring body and is provided with a wing part formed by bending two ends outwards, the peripheral wall of the inner gear ring is provided with an accommodating groove for accommodating the speed regulating steel wire, and the speed regulating steel wire is clamped in the accommodating groove.

9. The power tool of claim 8, wherein: the wing part of the speed regulating steel wire is arranged in the sliding groove in a sliding mode, and the wing part of the speed regulating steel wire penetrates through the sliding groove to be connected and fixed to the inner wall of the regulating cup.

10. The power tool of claim 8, wherein: when the wing part of the speed regulating steel wire slides to the first speed section or the fourth speed section, the magnet is positioned in the induction range of the Hall element.

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