CN110617325B - Speed change transmission mechanism and speed change tool thereof - Google Patents
Speed change transmission mechanism and speed change tool thereof Download PDFInfo
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- CN110617325B CN110617325B CN201810635940.6A CN201810635940A CN110617325B CN 110617325 B CN110617325 B CN 110617325B CN 201810635940 A CN201810635940 A CN 201810635940A CN 110617325 B CN110617325 B CN 110617325B
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- speed
- speed change
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- switching piece
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/023—Mounting or installation of gears or shafts in the gearboxes, e.g. methods or means for assembly
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/0003—Arrangement or mounting of elements of the control apparatus, e.g. valve assemblies or snapfittings of valves; Arrangements of the control unit on or in the transmission gearbox
- F16H61/0006—Electronic control units for transmission control, e.g. connectors, casings or circuit boards
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/02—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used
- F16H61/0202—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
- F16H63/40—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism comprising signals other than signals for actuating the final output mechanisms
- F16H63/50—Signals to an engine or motor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H2057/02034—Gearboxes combined or connected with electric machines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H2057/02039—Gearboxes for particular applications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H2057/02086—Measures for reducing size of gearbox, e.g. for creating a more compact transmission casing
Abstract
The invention claims a variable speed transmission mechanism and a variable speed tool thereof, wherein the variable speed transmission mechanism comprises a variable speed gear box, a variable speed gear ring and a speed switching piece, wherein the variable speed gear ring is arranged on the variable speed gear box and is used for changing the speed of the variable speed gear box, and the speed switching piece is used for driving the variable speed gear ring to change the position; the speed switching piece is provided with a signal trigger, and the variable speed transmission mechanism further comprises a signal receiver and a control chip; the control chip takes the signal receiver to receive the signal sent by the signal trigger on the speed switching piece as a starting signal to control the rotating speed of the driving motor on the input end of the speed changing gear box. The invention is realized by integrating mechanical variable speed regulation and electronic variable speed regulation on the speed switching piece through reasonable structural arrangement, and compared with the prior art, the invention simplifies the structure of a gear train in the variable speed gear box.
Description
Technical Field
The invention belongs to the technical field related to electric tools, and particularly relates to a variable-speed transmission mechanism and a variable-speed tool thereof.
Background
Electric tools are devices using electricity as power and have wide application in many fields.
It will be appreciated that the output shaft of a power tool will typically have different speed and gear selections to meet different operating requirements, depending on the application. At present, gear selection on the existing electric tools is realized by mechanical speed regulation, that is, when the electric tools are used, the gear selection is realized by adjusting different transmission ratios of a speed change gear box. Wherein, for the electric tool who has 4 grades of selections, if all adopt the mode of mechanical speed governing to realize, this can make change gear box's gear train complicated, and the size is long, and the corresponding part quantity that uses is many, and weight is heavy to make corresponding electric tool's bulky, and manufacturing cost is high, can't satisfy people to electric tool's user demand.
Disclosure of Invention
In view of the above, it is necessary to provide a variable speed transmission mechanism and an electric tool thereof.
The speed change transmission mechanism comprises a speed change gear box, a speed change gear ring and a speed switching piece, wherein the speed change gear ring is arranged on the speed change gear box and used for changing the speed of the speed change gear box, and the speed switching piece is used for driving the speed change gear ring to change the position; the speed switching piece is provided with a signal trigger, the variable speed transmission mechanism further comprises a signal receiver and a control chip, and the signal receiver and the control chip are fixedly arranged relative to the variable speed gearbox; the control chip takes the signal receiver to receive the signal sent by the signal trigger on the speed switching piece as a starting signal to control the rotating speed of the driving motor on the input end of the speed changing gear box.
In a preferred aspect of the present invention, the speed switching member is connected to the shift ring gear via a shift push block and a shift link, and the speed switching member is provided on the shift push block and drives the shift push block to shift the position of the shift ring gear via the shift link.
As a preferable scheme of the present invention, the speed switching member drives the speed change connecting rod through the speed change pushing block to control the speed change gear ring to adjust the speed change gear box to perform high-speed transmission, and the control chip controls the rotation speed of the driving motor.
As a preferable aspect of the present invention, the speed switching member is slidably connected to the speed changing push block, the signal trigger is disposed on the speed switching member along a sliding direction of the speed changing push block, and when the speed switching member slides on the speed changing push block, the signal receiver receives a signal sent by the signal trigger and sends a start signal to the control chip.
As a preferable aspect of the present invention, the speed change push block is provided with a slide connection portion, the speed switching member is provided with an engagement portion, and the slide connection between the speed change push block and the speed switching member is realized by the engagement between the slide connection portion and the engagement portion.
As a preferable aspect of the present invention, the sliding connection portion on the speed change push block is provided with a T-shaped protrusion, and the engagement portion on the speed switching member is provided with a T-shaped groove for matching the T-shaped protrusion.
As a preferable scheme of the present invention, the signal trigger is a magnetic member embedded on the speed switching member, the signal receiver is a hall plate, and the hall plate is in signal connection with the control chip through a power line.
As a preferred scheme of the present invention, the signal receiver comprises two hall plates which are respectively in signal connection with the control chip, and the two hall plates are respectively arranged on two sides of the speed switching piece; and the two side end parts of the speed switching piece along the sliding direction of the speed changing push block are respectively provided with a magnetic piece matched with the two Hall plates.
As a preferred scheme of the present invention, the control chip is provided with two control modules, the two control modules are arranged in one-to-one correspondence with the two hall plates, and the two control modules respectively adjust and control the rotation speed of the driving motor through the corresponding control modules.
In a preferred embodiment of the present invention, the magnetic member is a magnet, and is fitted to the speed switching member and fixedly connected to the speed switching member.
The invention also requests to protect a speed change tool, which comprises a shell, a driving motor, a speed change transmission mechanism and an output shaft, wherein the driving motor, the speed change transmission mechanism and the output shaft are arranged in the shell; the speed change transmission mechanism comprises a speed change gear box, a speed change gear ring and a speed switching piece, wherein the speed change gear ring is arranged on the speed change gear box and used for changing the speed of the speed change gear box, and the speed switching piece is used for driving the speed change gear ring to change the position; the speed switching piece is provided with a signal trigger, the variable speed transmission mechanism further comprises a signal receiver and a control chip, and the signal receiver and the control chip are fixedly arranged relative to the variable speed gearbox; the control chip takes the signal receiver to receive the signal sent by the signal trigger on the speed switching piece as a starting signal to control the rotating speed of the driving motor on the input end of the speed changing gear box.
As a preferable aspect of the present invention, the direction in which the speed switching member drives the shift ring gear to perform position conversion is along the axial direction of the output shaft; when the speed switching piece moves in the direction perpendicular to the axis, the signal receiver can receive the signal sent by the signal trigger.
As a preferable mode of the present invention, when the speed switching member drives the speed change ring gear to move between the first position and the second position, the output shaft correspondingly outputs the first rotational speed and the second rotational speed, respectively, when the speed switching member drives the speed change ring gear to move to the first position, the speed switching member is capable of moving between a third position and a fourth position along a direction perpendicular to the axis, the output shaft correspondingly outputs a third rotational speed and a fourth rotational speed, respectively, and the third rotational speed and the fourth rotational speed have values between the first rotational speed and the second rotational speed.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
the speed change transmission mechanism and the speed change tool thereof provided by the invention have the advantages that through reasonable structural arrangement, the speed change transmission mechanism can receive signals transmitted by the signal trigger on the speed switching piece through the signal receiver and can be used as a starting signal for controlling the rotating speed of the driving motor on the input end of the speed change gear box by using the signals as the control chip, so that the adjustment of different rotating speeds at the output end of the speed change transmission mechanism is realized, the mechanical speed change adjustment and the electronic speed change adjustment are integrated on the speed switching piece, and compared with the prior art which only uses the mechanical adjustment of the transmission ratio on the speed change gear box, the structure of a gear train in the speed change gear box is simplified, and the size of the speed change gear box is reduced; meanwhile, the invention adopts a mode of combining electronic speed regulation and mechanical speed regulation, so that the difference of the rotating speed between different gears of the speed-changing transmission mechanism is reduced, the use appropriateness under different working conditions is improved, and the operation quality of the electric tool is further improved.
Drawings
Fig. 1 is a schematic structural diagram of a speed change tool provided by the present invention.
Fig. 2 is a schematic structural view of the speed change transmission mechanism in mechanical speed change adjustment in the invention.
Fig. 3 is a cross-sectional view of fig. 2.
Fig. 4 is a schematic structural view of the speed change transmission mechanism in electronic speed change adjustment in the present invention.
10, a shell; 20. A variable speed drive mechanism; 21. a change speed gear box; 22. a speed change ring gear; 23. a speed change link; 24. a variable speed push block; 25. a speed switching member; 26. a Hall plate; 27. a magnet; 30. an output shaft; 241. a T-shaped convex part; 251. t-shaped groove.
Detailed Description
Referring to fig. 1, the speed changing tool claimed in the present invention includes a housing 10, a driving motor (not shown) disposed in the housing 10, a speed changing transmission mechanism 20, and an output shaft 30, wherein an input end of the speed changing transmission mechanism 20 is connected to the driving motor, and an output end of the speed changing transmission mechanism is connected to the output shaft 30; when the speed change tool works, the driving motor realizes the output operation of the output shaft 30 at different rotating speeds under the speed change regulation of the speed change transmission mechanism 20.
Referring to fig. 2 to 4, the speed change transmission mechanism 20 includes a speed change gear box 21, a speed change gear ring 22 disposed on the speed change gear box 21 and used for changing the speed of the speed change gear box 21, and a speed switching member 25 used for driving the speed change gear ring 22 to change the position, wherein the speed switching member 25 is provided with a signal trigger, the speed change transmission mechanism 20 is further provided with a signal receiver and a control chip, and the signal receiver and the control chip are fixedly disposed relative to the speed change gear box; the signal receiver is used for correspondingly receiving a signal sent by a signal trigger on the speed switching piece 25 and is used as a starting signal of a control chip, and the control chip is used for regulating the rotating speed of a driving motor on the input end of the speed changing gear box 21.
It is understood that the speed switching member 25 of the present embodiment is used to change the position of the change gear ring 22 to realize the speed change and speed regulation of the change gear box 21 by the change gear ring 22, that is, to realize the mechanical adjustment of the transmission ratio of the change gear box 21 by the speed switching member 25.
Specifically, the speed switching member 25 of the present embodiment is connected to the shift ring gear 22 through the shift link 23 and the shift push block 24, and the speed switching member 25 is provided on the shift push block 24 and can drive the shift push block 24 to change the position of the shift ring gear 22 through the shift link 23. That is, the speed switching member 25 can simultaneously drive the shift push blocks 24 and realize the driving of the position change of the shift ring gear 22 by the transmission of the shift link 23.
The speed change gear ring 22 is arranged in the speed change gear box 21, can change position in the speed change gear box 21, and realizes speed change of the speed change gear box 21, specifically performs speed change adjustment on high-speed transmission and low-speed transmission of the speed change gear box 21, specifically means that the speed change gear ring 22 is assembled in the speed change gear box 21 and can move for a certain distance relative to the speed change gear box 21, when the speed change gear ring 22 moves, internal teeth in the speed change gear box 21 can be driven to move on a tooth shell, when the speed change gear ring 22 is at one position, the speed change gear ring 22 can drive the internal teeth to be separated from the tooth shell, when the speed change gear box 21 performs gear transmission, the internal teeth simultaneously rotate and then output, so that the second-stage transmission of the speed change gear box 21 is realized, and belongs to the high-speed transmission of; when the speed change gear ring 22 is located at another position, the speed change gear ring 22 drives the internal teeth to be matched with the gear shell, so that when the speed change gear box 21 performs gear transmission, only the gears inside the internal teeth rotate and then output, the first-stage transmission of the speed change gear box 21 is realized, and the low-speed transmission belongs to the speed change gear box 21. It should be noted that, when the speed change gear box 21 of the present embodiment is used, the speed change gear ring 22 can be used to realize the conversion between the high speed transmission and the low speed transmission, and the specific implementation of the speed change gear box 21 of the present embodiment corresponds to the working principle of the mechanical torque adjustment, and specifically, reference may be made to the power tool (application No. 201010506996.5; application No. 2010.09.29) and the electric drill (application No. 2008101787926; application No. 2008.11.25), which are not specifically set forth herein.
The speed change push block 24 is provided with a sliding connection portion, the speed switch 25 is provided with a matching portion, and the sliding connection between the speed change push block 24 and the speed switch 25 is realized through the matching between the sliding connection portion and the matching portion.
Specifically, the sliding connection portion on the shift push block 24 is provided as a T-shaped protrusion 241, the engagement portion on the speed switch 25 is provided as a T-shaped groove 251 for matching the T-shaped protrusion 241, and when the speed switch 25 is assembled on the shift push block 24, the T-shaped protrusion 241 on the shift push block 24 extends upward into the T-shaped groove 251 of the speed switch 25 and is slidably connected with respect to the speed switch 25. It should be noted that, the specific structure of the sliding connection portion and the matching portion on the speed change pushing block 24 in the present embodiment may also be configured as a dovetail groove type convex portion matching with a dovetail groove, or implemented by using a special-shaped convex portion and a special-shaped groove, and the speed change pushing block 24 and the speed switching member 25 may be alternatively configured with a concave-convex portion, which is not necessarily elaborated herein.
One side of the speed-changing push block 24 is fixedly connected with the speed-changing connecting rod 23, so that the speed switching piece 25 can drive the speed-changing connecting rod 23 to drive the speed-changing gear ring 22 when driving the speed-changing push block 24 to move back and forth, and further, the mechanical speed-changing adjustment of the speed-changing transmission mechanism 20 is realized.
In this embodiment, the signal trigger is disposed on the speed switching member 25 along the sliding direction of the speed changing pushing block 24, and when the speed switching member 25 slides on the speed changing pushing block 24, the signal receiver receives the signal sent by the signal trigger and sends a starting signal to the control chip. That is, the speed change transmission mechanism 20 of the present embodiment adjusts the rotation speed of the driving motor at the input end of the speed change gear box 21 by the control chip through the sliding of the speed switching member 25 on the speed change push block 24.
It can be understood that the signal between the signal receiver and the signal trigger of this embodiment may be set to be a laser signal, a light signal, or a magnetic field signal, that is, when the signal trigger works, the signal receiver may transmit the laser signal, the light signal, or the magnetic field signal, and respectively receive the laser signal, the light signal, or the magnetic field signal, so as to implement signal transmission between the two. The signal between the signal trigger and the signal receiver of the present embodiment is preferably a magnetic field signal.
In this embodiment, the signal trigger is a magnetic object, preferably a magnet 27, the magnetic object is specifically embedded on the speed switching member 25 and is fixed in a limited manner relative to the speed switching member 25, and the signal receiver is a hall plate 26 or other magnetic field receiver arranged corresponding to the magnet 27.
The control chip is arranged on a control circuit board (not shown) in the electric tool, is applied to the control circuit board, and specifically adjusts and controls the rotating speed of the driving motor through the control module. In this embodiment, the control module is specifically an electronic control program, so that when the control chip performs speed adjustment control on the driving motor, the electronic control program on the control chip can be specifically started to implement the speed adjustment control.
It can be understood that, in the present embodiment, the control chip is used to adjust the rotation speed of the driving motor, and the control chip is arranged in one-to-one correspondence with the hall plate 26 receiving the magnetic field signal of the magnet 27, and the control chip is used to specifically set two different modes of adjustment for the rotation speed of the driving motor in the present embodiment, that is, two control modules are arranged on the control chip of the present embodiment to respectively adjust the rotation speed of the driving motor, and the variable speed transmission mechanism 20 is correspondingly provided with two magnets 27 and two hall plates 26.
Specifically, the two magnets 27 are provided specifically on both side end portions of the speed switching member 25 in the sliding direction of the speed changing push block 24. And two hall plates 26 are provided on both sides of the speed switching member 25 in the sliding direction of the speed changing push block 24, respectively. That is, the speed switching member 25 moves on the speed changing push block 24 in two directions along the T-shaped protrusion 241 of the speed changing push block 24, and the magnetic signal emitted by the magnet 27 disposed on one side of the speed switching member 25 is correspondingly sensed by the hall plate 26 on the same side as the magnet 27, and sends an activation signal to the control chip, so as to adjust the rotation speed of the driving motor by the control chip. It should be noted that the reception of the magnetic signal emitted from the magnet 27 by the hall plate 26 is realized according to the position change of the magnet 27 on the speed switching member 25, and specifically, can be realized according to the magnetic field intensity of the magnet 27 sensed by the hall plate 26. That is, when the magnet 27 and the speed switching member 25 are at a specific position and a specific angle with the hall plate 26 corresponding to the magnet 27, the hall plate 26 sends a signal to the control chip to start the control chip, and the control chip controls the rotation speed of the driving motor.
It is understood that the fixing manner between the magnet 27 and the speed switching member 25 may be welding, tight fitting, etc., that is, the magnet 27 provided on the speed switching member 25 in this embodiment does not change the original structure of the speed switching member 25.
The hall plate 26 sends a signal to the control chip to start the control chip to adjust and control the rotation speed of the driving motor, specifically, the magnet 27 is controlled by the relative position of the magnet 27 and the hall plate 26, and the magnet 27 is specifically assembled on the speed switching member 25 and changes the position along with the movement of the speed switching member 25 relative to the speed change push block 24, that is, whether the control chip of the present embodiment is used for adjusting and controlling the rotation speed of the driving motor is realized by the speed switching member 25, so that the control switches for mechanical speed change adjustment and electronic speed change adjustment of the speed change adjusting mechanism 20 of the present embodiment are integrated on the speed switching member 25, and the speed change adjustment of the above two modes is realized by the driving of one speed switching member 25.
As can be seen from the above, in the speed change adjustment of the speed change transmission mechanism 20 of the present embodiment, the speed switching member 25 drives the speed change push block 24 back and forth, and the position of the speed change ring gear 22 is changed and adjusted by the speed change link 23 to realize the mechanical speed change adjustment of the speed change gear box 21, or the speed switching member 25 drives the speed change push block 24 back and forth, and the position of the magnet 27 on the speed switching member 25 is sensed by the two hall plates 26 to realize the signal input, and the control chip is started to realize the electronic speed change adjustment of the adjustment control of the rotation speed of the driving motor. In the embodiment, the electronic speed change adjustment of the control chip to the rotation speed adjustment of the driving motor is realized when the speed switching piece 25 drives the speed change connecting rod 23 through the speed change pushing block 24 to control the speed change gear ring 22 to adjust the speed change gear box 21 to perform high-speed transmission. That is, the electronic shift control of the shift transmission mechanism of the present embodiment is performed on the basis of the high output rotation speed of the shift gearbox 21.
In the present embodiment, the speed switching member 25 drives the shift ring gear 21 to shift the position in the axial direction of the output shaft 30; when the speed switching piece 25 moves in the direction perpendicular to the axis, the signal receiver can receive the signal sent by the signal trigger. That is, the speed-change transmission mechanism 20 of the present embodiment is realized by the speed switching member 25 driving the speed-change push block 24 to move along the axial direction of the output shaft 30 during the mechanical speed-change adjustment, that is, the speed switching member 25 drives the speed-change push block 24 to realize the mechanical speed-change adjustment; the electronic speed change adjustment of the speed change transmission mechanism 20 of the present embodiment is realized by sliding the speed switching member 25 on the speed change pushing block 24, so that the mechanical speed change adjustment and the electronic speed change adjustment of the present embodiment are realized by being combined on the speed switching member 25, which is convenient for people to operate.
When the speed switching member 25 of the present embodiment drives the change gear ring 22 to move between the first position and the second position, the output shaft 30 correspondingly outputs a first rotational speed and a second rotational speed, wherein the first rotational speed is the output rotational speed of the change gear box 21 to the output shaft 30 during the low speed transmission, and the second rotational speed is the output rotational speed of the change gear box 21 to the output shaft 30 during the high speed transmission. And when the speed switching member 25 of the present embodiment drives the speed-changing gear ring 22 to shift to the first position, that is, when the speed-changing gear box 21 is in high-speed transmission, the speed switching member 25 can move between a third position and a fourth position along a direction perpendicular to the axis, and the output shaft 30 correspondingly outputs a third rotating speed and a fourth rotating speed, respectively, where the values of the third rotating speed and the fourth rotating speed are between the first rotating speed and the second rotating speed. The third position is that one of the hall plates 26 in this embodiment sends a signal to the control chip, so that the control chip starts the position of the speed switching member 25 on the speed change push block 24 when working; and the fourth position is the position of the other hall plate 26 in the embodiment sending a signal to the control chip, so that the control chip starts the operation of the speed switching member 25 on the speed changing push block 24.
To sum up, the speed change transmission mechanism and the speed change tool thereof provided by the invention can receive the signal transmitted by the signal trigger on the speed switching piece through the reasonable structural arrangement, and the signal is used as the starting signal for controlling the rotating speed of the driving motor on the input end of the speed change gear box by the signal receiver, so as to realize the adjustment of different rotating speeds at the output end of the speed change transmission mechanism, wherein the mechanical speed change adjustment and the electronic speed change adjustment are integrated on the speed switching piece, compared with the prior art which only uses the mechanical adjustment of the transmission ratio on the speed change gear box, the structure of the gear train in the speed change gear box is simplified, and the size of the speed change gear box is reduced; meanwhile, the invention adopts a mode of combining electronic speed regulation and mechanical speed regulation, so that the difference of the rotating speed between different gears of the speed-changing transmission mechanism is reduced, the use appropriateness under different working conditions is improved, and the operation quality of the electric tool is further improved.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (11)
1. A variable-speed transmission mechanism comprises a variable-speed gear box, a variable-speed gear ring and a speed switching piece, wherein the variable-speed gear ring is arranged on the variable-speed gear box and used for changing the speed of the variable-speed gear box, and the speed switching piece is used for driving the variable-speed gear ring to change the position; the method is characterized in that: the speed switching piece is provided with a signal trigger, the variable speed transmission mechanism further comprises a signal receiver and a control chip, and the signal receiver and the control chip are fixedly arranged relative to the variable speed gearbox; the control chip takes a signal which is sent by a signal trigger on the speed switching piece and received by the signal receiver as a starting signal to control the rotating speed of the driving motor on the input end of the speed changing gearbox;
the speed switching piece is connected with the speed change gear ring through a speed change push block and a speed change connecting rod, is arranged on the speed change push block, can be connected with the speed change push block in a sliding mode relative to the speed change push block, and can drive the speed change push block to carry out position change on the speed change gear ring through the speed change connecting rod;
the signal trigger is arranged on the speed switching piece along the sliding direction of the variable-speed push block, and when the speed switching piece slides on the variable-speed push block, the signal receiver receives a signal sent by the signal trigger and sends a starting signal to the control chip.
2. The variable speed drive of claim 1, wherein: the speed switching piece drives the speed change connecting rod through the speed change push block to control the speed change gear ring to adjust the speed change gear box to carry out high-speed transmission, and the control chip controls the rotating speed of the driving motor.
3. The variable speed drive of claim 1, wherein: the speed switching mechanism is characterized in that a sliding connection part is arranged on the speed changing push block, a matching part is arranged on the speed switching piece, and the sliding connection between the speed changing push block and the speed switching piece is realized through the matching between the sliding connection part and the matching part.
4. The variable speed drive of claim 3, wherein: the sliding connection part on the speed change push block is a T-shaped convex part, and the matching part on the speed switching piece is a T-shaped groove used for matching the T-shaped convex part.
5. The variable speed drive of claim 1, wherein: the signal trigger is a magnetic part embedded on the speed switching part, the signal receiver is a Hall plate, and the Hall plate is in signal connection with the control chip through a power line.
6. The variable speed drive of claim 5, wherein: the signal receiver comprises two Hall plates which are respectively in signal connection with the control chip, and the two Hall plates are respectively arranged on two sides of the speed switching piece; and the two side end parts of the speed switching piece along the sliding direction of the speed changing push block are respectively provided with a magnetic piece matched with the two Hall plates.
7. The variable speed drive of claim 6, wherein: the control chip is provided with two control modules, the two control modules are arranged in one-to-one correspondence with the two Hall plates, and the rotating speed of the driving motor is regulated and controlled through the corresponding control modules.
8. The variable speed drive of claim 6, wherein: the magnetic part is a magnet, is embedded on the speed switching part and is fixedly connected with the speed switching part.
9. A variable speed tool, characterized by: the device comprises a shell, a driving motor, a variable speed transmission mechanism and an output shaft, wherein the driving motor, the variable speed transmission mechanism and the output shaft are arranged in the shell; the speed change transmission mechanism comprises a speed change gear box, a speed change gear ring and a speed switching piece, wherein the speed change gear ring is arranged on the speed change gear box and used for changing the speed of the speed change gear box, and the speed switching piece is used for driving the speed change gear ring to change the position; the speed switching piece is provided with a signal trigger, the variable speed transmission mechanism further comprises a signal receiver and a control chip, and the signal receiver and the control chip are fixedly arranged relative to the variable speed gearbox; the control chip takes a signal which is sent by a signal trigger on the speed switching piece and received by the signal receiver as a starting signal to control the rotating speed of the driving motor;
the speed switching piece is connected with the speed change gear ring through a speed change push block and a speed change connecting rod, is arranged on the speed change push block, can be connected with the speed change push block in a sliding mode relative to the speed change push block, and can drive the speed change push block to carry out position change on the speed change gear ring through the speed change connecting rod;
the signal trigger is arranged on the speed switching piece along the sliding direction of the variable-speed push block, and when the speed switching piece slides on the variable-speed push block, the signal receiver receives a signal sent by the signal trigger and sends a starting signal to the control chip.
10. The shifting tool of claim 9, wherein: the speed switching piece drives the speed-changing gear ring to change the position along the axial direction of the output shaft; when the speed switching piece moves in the direction perpendicular to the axis, the signal receiver can receive the signal sent by the signal trigger.
11. The shifting tool of claim 10, wherein: when the speed switching piece drives the speed change gear ring to move between a first position and a second position, the output shaft correspondingly outputs a first rotating speed and a second rotating speed respectively, when the speed switching piece drives the speed change gear ring to change to the first position, the speed switching piece can move between a third position and a fourth position along the direction perpendicular to the axis, the output shaft correspondingly outputs a third rotating speed and a fourth rotating speed respectively, and the numerical values of the third rotating speed and the fourth rotating speed are between the first rotating speed and the second rotating speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810635940.6A CN110617325B (en) | 2018-06-20 | 2018-06-20 | Speed change transmission mechanism and speed change tool thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810635940.6A CN110617325B (en) | 2018-06-20 | 2018-06-20 | Speed change transmission mechanism and speed change tool thereof |
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| Publication Number | Publication Date |
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| CN110617325A CN110617325A (en) | 2019-12-27 |
| CN110617325B true CN110617325B (en) | 2021-06-11 |
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| CN201810635940.6A Active CN110617325B (en) | 2018-06-20 | 2018-06-20 | Speed change transmission mechanism and speed change tool thereof |
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| Publication number | Publication date |
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| CN110617325A (en) | 2019-12-27 |
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