CN201881362U - Speed-adjusting electric tool - Google Patents
Speed-adjusting electric tool Download PDFInfo
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- CN201881362U CN201881362U CN2010206472395U CN201020647239U CN201881362U CN 201881362 U CN201881362 U CN 201881362U CN 2010206472395 U CN2010206472395 U CN 2010206472395U CN 201020647239 U CN201020647239 U CN 201020647239U CN 201881362 U CN201881362 U CN 201881362U
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- wheels
- gearratio
- electric tool
- output shaft
- driven
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Abstract
The utility model relates to a speed-adjusting electric tool which comprises a tool head, wherein a main motor is used for providing rotation motive force for the tool head, the tool head is connected with an output shaft, the motor is connected with a driving shaft, a driving wheel group is mounted on the driving shaft, a driven wheel group is mounted on the output shaft, and a closed V-shaped belt is respectively meshed with V-shaped grooves of the driving wheel group and the driven wheel group so as to be in transmission connection with the driving wheel group and the driven wheel group, and a transmission ratio automatic regulation device is used for controlling at least one of the driving wheel group and the driven wheel group so as to control the transmission ratio of the driving shaft to the output shaft. The electric tool adopting the technical scheme can realize continuous changes of the rotational speed of the output shaft, thereby being applicable to various different load torques and effectively improving the working efficiency.
Description
[technical field]
The present invention relates to a kind ofly, relate in particular to the electric tool that has the speed governing transmission mechanism by motor-driven instrument.
[background technology]
Electric tool especially rotates type electric tool, as electric drill, screwdriver, hammer drill etc., has speed adjusting gear usually exporting different working speeds, thereby adapts to different load torques.Speed adjusting gear of the prior art generally is provided with multistage output gear, by manually or automatically controlling the switching of gear, thereby exports different rotating speeds.Yet the rotating speed of output disperses, discontinuous variation, therefore can not reach optimal matching effect with load torque.And the output of obviously controlling rotating speed manually needs the operator to pay close attention to the duty and the load variations of instrument constantly, and accurately judges the output speed that instrument is required.So not only need the operator that very professional operative skill is arranged, and not easy to operate.In addition, the adjusting rotating speed that stops of having to sometimes in operating process is wasted time and energy.Though and automatic speed regulation mechanism of the prior art can be adjusted output speed automatically according to the variation of load torque, but these automatic transmissions all are by switch the adjusting that realizes output speed between different gears, its velocity variations disperses, stepped, in rotation speed change in a flash, the abrupt change meeting of rotating speed makes operation that the pause and transition in rhythm or melody sense be arranged, not very comfortable, even may make and grip unstablely, influence the work accuracy of instrument, in the time of seriously even the personal safety accident may take place.In addition, automatic transmission of the prior art takes place to beat the tooth phenomenon easily, influences the life-span of gear, simultaneously also may the gear shift failure because can't accurately mesh.
[summary of the invention]
The object of the present invention is to provide a kind of improved speed governing electric tool, to overcome the deficiencies in the prior art.
To achieve these goals, the technical solution adopted in the present invention is: a kind of speed governing electric tool, comprise a tool heads, a main motor provides rotation motive power for tool heads, wherein tool heads is connected with an output shaft, motor is connected with a driving shaft, it is characterized in that: initiatively wheels are housed on the driving shaft, driven wheels are housed on the output shaft, initiatively wheels and driven pulley group are respectively by fast pulley with can form by axially movable movable wheel, described two groups of fast pulleys are cone structure with the relative one side of movable wheel, thereby between each group fast pulley and movable wheel, form the V-type groove, the V-type band of a closure respectively with the engagement of the V-type groove of active wheels and driven wheels, gearratio self-checking device and wheels initiatively and driven the wheels activity of one of them are at least taken turns and are connected.
Compare with background technology, adopt the electric tool of technique scheme can realize the continuous variation of output shaft rotating speed, thereby can adapt to various load torque, effectively increase work efficiency.In addition, change in rotational speed realizes by the change of the axial location of activity wheel, thereby than being easier to realization, not the gear that can take place to exist in the prior art beat tooth or can't mesh and cause can't speed change phenomenon.Simultaneously, but the present invention is realizing having realized automatic speed regulation on the basis of continuous speed adjustment, thereby adapts to different loads automatically, not only operates easily, easy, and has improved operating efficiency, has overcome the deficiencies in the prior art.
One of improvement the most of the present invention, the gearratio self-checking device is regulated initiatively wheels and the driven wheels axial location of the activity wheel of one of them at least according to measured parameter value, and wherein said parameter value is the data of the suffered change in torque of reflection tool heads.So the gearratio control device can make the suffered moment of torsion of output speed and tool heads adapt, and realizes accurately control.
Preferably, described parameter be the input current of main motor, main motor speed, drive shaft speed and output shaft rotating speed at least one of them.These data can the most direct change in torque that reflects that the most intuitively tool heads is suffered, and detects easily.
Preferably, described gearratio control device comprises a gearratio control motor and an impeller that is subjected to gearratio control driven by motor and can axially moves.Adopt motor to make mechanism simple, and be convenient to control as the dynamical element of gearratio control.
As one of improvement of the present invention, electric tool of the present invention provides power supply by a rechargeable battery.Its advantage is portable, and can adapt to multiple workplace, especially is fit to be applied to infinite variable speed electric tool.
Preferably, described active wheels and driving shaft rotate synchronously, and described driven wheels and output shaft rotate synchronously.
Preferably, spring assembly axial pressure is in active wheels and the driven wheels outside of the activity wheel of one of them at least.
As one of improvement of the present invention, the gearratio control device comprises the gearratio control motor of a control circuit and a controlled circuit control, control circuit is according to the rotation of detected at least one parameter value control gearratio control motor, and then drive initiatively wheels and driven wheels at least one of them activity wheel axially move, described parameter value is the data of the suffered change in torque of reflection tool heads.
Hereinafter be that example is described with reference to the accompanying drawings the specific embodiment of the present invention, but the present invention is not limited to be applied to electric drill, also can be applicable to other suitable electric tool with the electric drill.
[description of drawings]
Fig. 1 is a kind of partial component structural representation of electric drill, and part wherein is broken away to show its internal structure.
[specific embodiment]
As shown in Figure 1, electric drill 10 has a head 1, can be driven by a main motor 2 to rotate.Head 1 is connected with an output shaft 3.Main motor 2 is connected with a driving shaft 5 after slowing down through one group of train of reduction gears 4.
Initiatively wheels 50 are housed on the driving shaft 5.Active wheels 50 comprise one and are fixed on the driving shaft 5 and the driving wheel fast pulley 51 of close train of reduction gears 4, comprise that also one can be taken turns 52 along driving shaft 5 axially movable driving wheels are movable.Driving wheel activity wheel 52 is non-rotatable with respect to driving shaft 5, so initiatively wheels 50 can rotate synchronously with driving shaft 5.A clutch shaft bearing 53 is fixed in the end of driving shaft 5, and one first compression spring 54 is compressed between clutch shaft bearing 53 and the movable wheel 52 of driving wheel.Driving wheel fast pulley 51 is cone structure with the movable wheel of driving wheel 52 relative one sides 510,520, thereby forms the groove 55 that the cross section is a V-type between driving wheel fast pulley 51 and the movable wheel 52 of driving wheel.
Correspondingly, driven wheels 30 are housed on the output shaft 3.Driven wheels 30 comprise one and are fixed on the output shaft 3 and the driven pulley fast pulley 31 of close head 1, comprise that also one can be taken turns 32 along output shaft 3 axially movable driven pulleys are movable.Driven pulley activity wheel 32 is non-rotatable with respect to output shaft 3, so driven wheels 30 can rotate synchronously with output shaft 3.One second bearing 33 is fixed in the end of output shaft 3, and one second compression spring 34 is compressed between second bearing 33 and the movable wheel 32 of driven pulley.Driven pulley fast pulley 31 is cone structure with the movable wheel of driven pulley 32 relative one sides 310,320, thereby forms the groove 35 that the cross section is a V-type between driven pulley fast pulley 31 and the movable wheel 32 of driven pulley.
The cross section of a closure be ladder type V-type band 6 respectively with V- type groove 55,35 engagement of active wheels 50 and driven wheels 30, thereby be in transmission connection initiatively wheels 50 and driven wheels 30.The power of main motor 2 outputs is delivered to initiatively wheels 50 after train of reduction gears 4 is slowed down, be delivered to driven wheels 30 by V-type band 6 then, thereby drives output shaft 3 and head 1 rotation.
With active wheels 50 is example, because initiatively the activity of wheels 50 wheel 52 can move axially, initiatively the V-type groove 55 of wheels 50 can broaden or narrow down, when V-type groove 55 broads, and the V-type band 6 close initiatively centers of wheels 50, initiatively the working diameter of wheels 50 is less.Otherwise when V-type groove 55 narrowed down, V-type band 6 moved to the initiatively outer rim of wheels 50, and initiatively the working diameter of wheels 50 is bigger.Driven wheels 30 are identical with active wheels 50 with the work relationship of V-type band 6, therefore repeat no more.
Because the length of V-type band 6 is constant, when one of them working diameter of active wheels 50 and driven wheels 30 diminished, it is big that the working diameter of another one correspondingly can become.Because initiatively wheels 50 and driven wheels 30 working diameters can change continuously, therefore this gearratio also is stepless, continually varying, and transferring power is more steady, and its dynamic property and economy are higher than the planetary gear type automatic transmission far away.
A gearratio control motor 7 is in transmission connection by an assisted deceleration gear-box 8 and a rhizoid bar 9.Screw mandrel 9 is connected with a ring flange 11, and ring flange 11 is installed on the output shaft 3, and between the second compression spring 34 and the movable wheel 32 of driven pulley.When gearratio control motor 7 drives screw mandrels 9 rotations, can drive ring flange 11 and move axially, move axially thereby drive the movable wheel 32 of driven pulley, near or away from driven pulley fast pulley 31.
Gearratio control motor 7 is connected with a control circuit 12, and control circuit 12 is connected with main motor 2.Control circuit 12 is according to the rotation of the input current control gearratio control motor 7 of main motor 2.
When electric drill 10 was started working, load was less, and initiatively the working diameter of wheels 50 is bigger, and the working diameter of driven wheels 30 is less, and the head 1 of the work of holing is with high rotational speed work.Along with the intensification of boring, load strengthens gradually, and the input current of main motor 2 takes place by corresponding the variation.The variation of main motor 2 input currents feeds back to control circuit 12.So rotation of control circuit 12 control gearratio control motors 7, make ring flange 11 promote the movable wheel 32 of driven pulley near driven pulley fast pulley 31, so the V-type groove 35 of driven wheels 30 narrows down, the V-type band is squeezed and slides into the outer rim of driven wheels 30, and it is big that the working diameter of driven wheels 30 becomes.Simultaneously, because the length of V-type band 6 is constant, V-type band 6 moves to the center along the V-type groove 55 of wheels 50 initiatively, and the movable wheel 52 of extruding driving wheel makes it to promote the first compression spring 54 and outwards moves, and initiatively the working diameter of wheels 50 diminishes.So obtain bigger gearratio, the rotating speed of head 1 reduces, and obtains bigger operation torque.
Preferably, electric drill 10 provides power supply by a rechargeable battery (accompanying drawing does not show).
Except the above-mentioned specific embodiment, control circuit 12 also can be according to other parameter values control gearratio control motor 7, and this parameter value preferably reflects the data of the change in torque that head 1 is suffered.Such data are except the input current of the motor in the above-mentioned specific embodiment, can also be the rotating speed of main motor 2, the rotating speed of driving shaft 5 and the rotating speed of output shaft 3 etc. at least one of them.
Above describe and the various specific embodiment shown in the drawings only is used to illustrate the present invention, be not of the present invention all.In the category of basic fundamental thought of the present invention, the those of ordinary skill of correlative technology field at any type of change that the present invention carried out all within protection scope of the present invention.
Claims (8)
1. speed governing electric tool, comprise a tool heads (1), a main motor (2) provides rotation motive power for tool heads, wherein tool heads is connected with output shaft (3), motor is connected with driving shaft (5), it is characterized in that: initiatively wheels (50) are housed on the driving shaft, driven wheels (30) are housed on the output shaft, initiatively wheels and driven pulley group are respectively by fast pulley (51,31) and can be axially movable movable wheel (52,32) form, described two groups of fast pulleys (51,31) and movable wheel (52,32) relative one side (510,310,520,320) be cone structure, thereby at each group fast pulley (51,31) and movable wheel (52,32) form V-type groove (55 between, 35), the V-type band (6) of a closure respectively with the V-type groove (55 of active wheels and driven wheels, 35) engagement, a gearratio self-checking device (7,8,9,11,12) with initiatively wheels (50) and driven wheels (30) at least one of them activity take turns (52,32) connect.
2. speed governing electric tool as claimed in claim 1, it is characterized in that: gearratio self-checking device (7,8,9,11,12) is regulated initiatively wheels (50) and driven wheels (30) axial location of the activity wheel (52,32) of one of them at least according to measured parameter value, and wherein said parameter value is for reflecting the data of the change in torque that tool heads (1) is suffered.
3. speed governing electric tool as claimed in claim 2 is characterized in that: described parameter be the input current of main motor (2), main motor (2) rotating speed, driving shaft (5) rotating speed and output shaft (3) rotating speed at least one of them.
4. as the wherein arbitrary described speed governing electric tool of claim 1 to 3, it is characterized in that: described gearratio self-checking device (7,8,9,11,12) comprises a gearratio control motor (7) and an impeller (11) that is subjected to gearratio control driven by motor and can axially moves.
5. speed governing electric tool as claimed in claim 1 is characterized in that: provide power supply by a rechargeable battery.
6. speed governing electric tool as claimed in claim 1 is characterized in that: described active wheels (50) and driving shaft (5) rotation synchronously, described driven wheels (30) and output shaft (3) rotation synchronously.
7. speed governing electric tool as claimed in claim 1 is characterized in that: a spring assembly (34,54) axial pressure is in active wheels (50) and driven wheels (30) outside of the activity wheel (52,32) of one of them at least.
8. speed governing electric tool as claimed in claim 1, it is characterized in that: gearratio self-checking device (7,8,9,11,12) comprises the gearratio control motor (7) of a control circuit (12) and a controlled circuit control, control circuit (12) is according to the rotation of detected at least one parameter value control gearratio control motor (7), and then drive initiatively wheels (50) and driven wheels (30) at least one of them activity wheel (52,32) axially move, described parameter value is for reflecting the data of the change in torque that tool heads (1) is suffered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206472395U CN201881362U (en) | 2010-12-08 | 2010-12-08 | Speed-adjusting electric tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206472395U CN201881362U (en) | 2010-12-08 | 2010-12-08 | Speed-adjusting electric tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201881362U true CN201881362U (en) | 2011-06-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206472395U Expired - Lifetime CN201881362U (en) | 2010-12-08 | 2010-12-08 | Speed-adjusting electric tool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201881362U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106413260A (en) * | 2016-09-25 | 2017-02-15 | 东莞市联洲知识产权运营管理有限公司 | Drilling apparatus for integrated circuit board |
| CN107237052A (en) * | 2017-06-26 | 2017-10-10 | 杰克缝纫机股份有限公司 | A kind of arrangements for speed regulation and sewing machine of sewing machine upper cloth feeding device |
-
2010
- 2010-12-08 CN CN2010206472395U patent/CN201881362U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106413260A (en) * | 2016-09-25 | 2017-02-15 | 东莞市联洲知识产权运营管理有限公司 | Drilling apparatus for integrated circuit board |
| CN106413260B (en) * | 2016-09-25 | 2018-09-14 | 东莞市联洲知识产权运营管理有限公司 | A kind of integrated circuit plate drilling device |
| CN107237052A (en) * | 2017-06-26 | 2017-10-10 | 杰克缝纫机股份有限公司 | A kind of arrangements for speed regulation and sewing machine of sewing machine upper cloth feeding device |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110629 |