CN209914514U - Speed change mechanism of electric tool - Google Patents
Speed change mechanism of electric tool Download PDFInfo
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- CN209914514U CN209914514U CN201920718357.1U CN201920718357U CN209914514U CN 209914514 U CN209914514 U CN 209914514U CN 201920718357 U CN201920718357 U CN 201920718357U CN 209914514 U CN209914514 U CN 209914514U
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Abstract
The utility model provides an electric tool speed change mechanism, which comprises a housin, be provided with the motor in the casing, sun gear, with sun gear meshing's planetary gear, outer ring gear, control ring, output shaft and cam, be provided with the external tooth on the outer ring gear, control ring one end is fixed the inner wall of casing, other end connection operation end, be provided with the internal tooth in the control ring, the internal tooth of control ring according to the operation selectivity of operation end with the external tooth meshing or the separation and reunion of outer ring gear realize planetary gear with the hookup or the cutting off of power between the output shaft, the utility model discloses a hookup or the cutting off of power between control ring control planetary gear and output shaft compare with prior art's electro-magnet, simple structure, reduce cost, the function is stable.
Description
Technical Field
The utility model relates to a mechanical transmission technical field, specificly involve an electric tool's planetary gear speed change mechanism.
Background
In the prior art, the grass cutting head device is generally provided with a planetary gear component, the output of the planetary gear is selectively controlled by controlling an outer gear ring of the planetary gear component, in the prior art, the control function is generally realized through the form of an electromagnet, but the form function of the electromagnet is not very stable, the condition of false triggering can occur, the structure of the electromagnet is complex, the electric control is required, and the cost is high.
SUMMERY OF THE UTILITY MODEL
Based on the above problem, the object of the present invention is to solve at least one of the technical drawbacks. The mechanical control mode is simple in structure, low in cost and stable in function. In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides an electric tool speed change mechanism, includes the casing, be provided with the motor in the casing, sun gear, with sun gear meshing's planetary gear, outer ring gear, control ring, output shaft and cam, be provided with the external tooth on the outer ring gear, control ring one end is fixed the inner wall of casing, other end connection operation end, be provided with the internal tooth in the control ring, the internal tooth of control ring according to the operation of operation end selective with the external tooth meshing or the separation and reunion of outer ring gear realize planetary gear with the hookup or the disconnection of power between the output shaft.
Preferably, the planetary gear set further comprises a planetary gear carrier, a connecting shaft is arranged on the planetary gear carrier, and the planetary gear is sleeved on the connecting shaft.
Preferably, be provided with starting switch on the casing, starting switch connects the operation end, when starting switch closed electric tool started, the internal tooth of control ring with outer ring gear meshing, starting switch disconnection, the internal tooth of control ring with outer ring gear separation and reunion.
Preferably, when the starting switch is closed, the operating end of the control ring moves upwards, the inner teeth of the control ring are meshed with the outer gear ring, when the starting switch is disconnected, the operating end of the control ring moves downwards, and the inner teeth of the control ring and the outer gear ring are in clutch.
Preferably, the power transmission device further comprises a cam, one end of the output shaft is connected with the cam, the motor rotates to drive the planetary gear to rotate, the power of the planetary gear is output by the output shaft and then transmitted to the cam, and the cam rotates.
Preferably, the number of the planetary gears is 2 to 4.
Preferably, the device further comprises a working head, and the output shaft is connected with the working head through the cam.
Preferably, the electric tool comprises one of a grass trimmer, a grass mower and a brush cutter.
For the scheme among the prior art, the utility model discloses an advantage:
the embodiment of the utility model provides an electric tool speed change mechanism is provided with sun gear in the casing, with sun gear meshing's planetary gear, with planetary gear meshing's outer ring gear, control ring, output shaft and cam, control ring one end are fixed the inner wall of casing, the operation end is connected to the other end, the internal tooth of control ring according to the operation selectivity of operation end with the outer tooth meshing or the separation and reunion of outer ring gear, the utility model discloses a hookup or the cutting off of power between control ring control planetary gear and output shaft compare with the electro-magnet of prior art, simple structure, reduce cost, the function is stable.
Drawings
The invention will be further described with reference to the following drawings and examples:
fig. 1 is a front view of the speed change mechanism of the electric tool of the present invention;
FIG. 2 is a side view of the power tool transmission mechanism of the present invention;
fig. 3 is a cross-sectional view of the electric tool speed change mechanism of the present invention taken along the direction a-a of fig. 2;
fig. 4 is a schematic view of each component of the speed change mechanism of the electric power tool of the present invention.
Detailed Description
The above-described scheme is further illustrated below with reference to specific examples. It should be understood that these examples are for illustrative purposes and are not intended to limit the scope of the present invention. The conditions employed in the examples may be further adjusted as determined by the particular manufacturer, and the conditions not specified are typically those used in routine experimentation.
Referring to fig. 1-4, the utility model discloses an electric tool speed change mechanism, which comprises a shell 100, a motor 10 is arranged in the shell 100, an output shaft 50 connected to the motor 1 is arranged, a transmission mechanism is arranged between the motor 10 and the output shaft 50, the transmission mechanism comprises a sun gear 20 fixed at the end part, an outer gear ring 21, a planet gear carrier 24 and a planet gear 30 rotatably connected to the planet gear carrier 24, wherein the planet gear carrier 24 is provided with connecting shafts 23 at intervals, the connecting shafts 23 are respectively sleeved with the planet gear 30, and the planet gear 30 is sleeved on the connecting shaft 23 through a connecting hole in the middle; the sun gear 20 and the outer ring gear 21 are respectively meshed with the pinion gears 30. The structure is that the sun gear 20 is arranged at the end part of the motor 10, the motor 10 rotates to drive the sun gear 20 to rotate, the sun gear 20 rotates to drive the planet gear 30 meshed with the sun gear 20 to rotate, the planet gear 30 drives the planet gear carrier 24 to rotate, and the planet gear carrier 24 drives the output shaft 50 to rotate; the planetary gear 30 is engaged with the external gear ring 21, the sun gear 20 drives the planetary gear 30 to revolve along the output shaft of the motor 10, and the external gear ring 21 drives the planetary gear 30 to rotate along the connecting shaft 23.
In the above embodiment, the planet gear carrier 24 is provided with three connecting shafts 23 with uniform intervals, the three connecting shafts 23 are respectively sleeved with the planet gears 30, and the planet gears 30 are sleeved on the connecting shafts 23 through the connecting holes in the middle; the number of the planetary gears 30 on the carrier 24 is not limited to three, and may be more than three, however, the number of the planetary gears 30 on the carrier is at least two, otherwise, the transmission mechanism cannot achieve the purpose of smooth transmission.
In the above embodiment, the connecting shaft 23 may be integrally formed with the carrier 24, or may be fixed to the carrier by an insert structure.
Electric tool speed change mechanism still include control ring 40, be provided with the external tooth on the outside outer ring gear 21 of sun gear 20, fixing 42 is passed through to control ring 40 one end and is fixed casing 100's inner wall, operation end 43 is connected to the other end, be provided with internal tooth 41 in the control ring 40, the internal tooth 41 of control ring 40 realizes the hookup or the cutting off of power between planetary gear 30 and output shaft 50 according to the operation selectivity of operation end 43 with the external tooth meshing or the separation and reunion of outer ring gear 21.
Referring to fig. 3, a cross-sectional view of the speed change mechanism of the electric tool of the present invention is shown, the speed change mechanism of the electric tool of the present invention further includes a working head 70, the output shaft 50 is sleeved on the cam 60, the output shaft 50 can drive the working head 70 to rotate, and the rotation axis of the output shaft 50 is parallel to the rotation axis of the sun gear 20.
Please refer to fig. 4 for a schematic diagram of each component of the speed change mechanism of the electric tool of the present invention, the present invention discloses a sun gear 20 includes a gear ring, the gear ring has an outer gear ring 21 and an inner gear ring 22, each planetary gear 30 is engaged with the inner gear ring 22 for linkage, the motor 10 is fixedly sleeved on the planetary gear 30, the motor 10 rotates to drive each planetary gear 30 to rotate through the output shaft of the motor 10, each planetary gear 30 is engaged with the inner gear ring 22 of the sun gear 20, the power of the planetary gear 30 is output by the output shaft 50 and then transmitted to the cam 60, and the cam 60 drives the working head 70 to work.
Please refer to fig. 2, which is a side view of the speed change mechanism of the electric tool of the present invention, the casing 100 of the present invention is provided with a start switch 101, the start switch 101 is connected to the operation end 43, when the electric tool is started by closing the start switch 101, the operation end 43 of the control ring 40 moves upwards, the internal teeth 41 of the control ring 40 are engaged with the external gear ring 21 of the sun gear 20, the power of the planetary gear 30 is output by the output shaft 50 and then transmitted to the cam 60, and the cam 60 drives the working head 70 to work. When the start switch 101 is turned off, the operation end 43 of the control ring 40 moves downward, the internal teeth 41 of the control ring 40 are disengaged from the outer ring gear 21 of the sun gear 20, the power of the planetary gear 30 is output from the outer ring gear 21, and the work head 70 stops operating.
In one embodiment of the present invention, the electric tool includes an electric tool such as a mower, a grass trimmer, etc., the motor 10, the transmission mechanism, the output shaft 50 and the working head 70 are all disposed on the housing 100 of the mower or the grass trimmer, at this time, the motor 10 is a high-speed motor, the working head 70 is a grass cutting head or a grass cutting head, the output shaft 50 is connected to the working head 70 through a screw, when the electric tool is a mower, the working head 70 is a pair of scissors, when the mower is closed by the start switch 101 and started, the operating end 43 of the control ring 40 moves upward, the internal teeth of the control ring 40 are engaged with the outer gear ring 21, the power of the planetary gear 30 is transmitted to the cam 60 through the output shaft, the cam 60 drives the scissors of the mower to cut grass, when the start switch 101 is turned off, the operating end 43 of the control ring 40 moves downward, the internal teeth of the control ring 40 are engaged with the outer, the power of the planetary gear 30 is output by the external gear ring 21, and the scissors stop cutting grass.
The utility model discloses an electric tool speed change mechanism is provided with sun gear in the casing, with sun gear meshing's planetary gear, with planetary gear meshing's outer ring gear, control ring, output shaft and cam, control ring one end are fixed the inner wall of casing, the operation end is connected to the other end, the internal tooth of control ring according to the operation selectivity of operation end with the outer tooth meshing of outer ring gear or separation and reunion, the utility model discloses a hookup or the cutting off of power between control ring control planetary gear and output shaft compare with prior art's electro-magnet, simple structure, reduce cost, the function is stable, and drive mechanism compact structure, the atress is even, rotates steadily, easy dismounting.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.
Claims (8)
1. The utility model provides an electric tool speed change mechanism, its characterized in that, includes the casing, be provided with the motor in the casing, sun gear, with sun gear meshing's planetary gear, outer ring gear, control ring, output shaft and cam, be provided with the external tooth on the outer ring gear, control ring one end is fixed the inner wall of casing, other end connection operation end, be provided with the internal tooth in the control ring, the internal tooth of control ring according to the operation selectivity of operation end with the external tooth meshing or the separation and reunion of outer ring gear realize planetary gear with the hookup or the disconnection of power between the output shaft.
2. The power tool speed change mechanism of claim 1, further comprising a planetary carrier having a coupling shaft, the planetary gear being externally received on the coupling shaft.
3. The power tool transmission mechanism according to claim 1, wherein a start switch is provided on the housing, the start switch is connected to the operation end, and when the start switch is turned on, the internal teeth of the control ring are engaged with the external gear ring, and the start switch is turned off, and the internal teeth of the control ring are engaged with and disengaged from the external gear ring.
4. The power tool transmission mechanism according to claim 3, wherein when the start switch is closed, the operating end of the control ring moves upward and the internal teeth of the control ring engage with the outer ring gear, and when the start switch is open, the operating end of the control ring moves downward and the internal teeth of the control ring engage with and disengage from the outer ring gear.
5. The power tool transmission mechanism of claim 1, further comprising a cam, wherein one end of the output shaft is connected to the cam, the motor rotates to drive the planetary gear to rotate, the planetary gear power is output through the output shaft and then transmitted to the cam, and the cam rotates.
6. The power tool transmission mechanism of claim 1, wherein the number of planetary gears is 2-4.
7. The power tool speed change mechanism of claim 5 further comprising a working head, wherein the output shaft is connected to the working head through the cam.
8. The power tool transmission mechanism of claim 1, wherein the power tool comprises one of a lawn mower, and a brush cutter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920718357.1U CN209914514U (en) | 2019-05-20 | 2019-05-20 | Speed change mechanism of electric tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920718357.1U CN209914514U (en) | 2019-05-20 | 2019-05-20 | Speed change mechanism of electric tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209914514U true CN209914514U (en) | 2020-01-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920718357.1U Active CN209914514U (en) | 2019-05-20 | 2019-05-20 | Speed change mechanism of electric tool |
Country Status (1)
| Country | Link |
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| CN (1) | CN209914514U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114310802A (en) * | 2020-09-29 | 2022-04-12 | 莱克电气绿能科技(苏州)有限公司 | Hand-held machine tool and hand-held electric tool with same |
-
2019
- 2019-05-20 CN CN201920718357.1U patent/CN209914514U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114310802A (en) * | 2020-09-29 | 2022-04-12 | 莱克电气绿能科技(苏州)有限公司 | Hand-held machine tool and hand-held electric tool with same |
| CN114310802B (en) * | 2020-09-29 | 2024-06-04 | 莱克电气绿能科技(苏州)有限公司 | Hand-held power tool and hand-held electric tool with same |
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