CN102441872A

CN102441872A - Power tool

Info

Publication number: CN102441872A
Application number: CN2010105112607A
Authority: CN
Inventors: 强尼·鲍瑞那图; 何明明; 周达
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2010-10-01
Filing date: 2010-10-01
Publication date: 2012-05-09

Abstract

The invention relates to a power tool, which comprises a housing, a motor and a transmission mechanism arranged in the housing, and a working head doing swinging movement relative to the housing under the drive of the motor and the transmission mechanism; and the swinging frequency of the working head is more than or equal to 20000 times/min. The swinging frequency of the working head of the power tool provided by the invention is greatly improved compared with that of the normal power tool, so that the working quality and the working efficiency can be dramatically improved.

Description

Power tool

Technical field

The present invention relates to a kind of power tool, especially a kind of swing type power tool.

Background technology

The common swing class power tool purposes of industry is very many; Its operation principle is that motor makes output shaft drive working head do swing around its axis through transmission mechanism; When the user after different annex working heads is installed on the output shaft; Can realize multiple different operation function, as sawing, cut, grind, scrape etc., to adapt to the different working demand.

The working head hunting frequency of conventional swing class power tool is about 15000 times/minute in the market, and hunting frequency is low, inefficiency.

Summary of the invention

To the deficiency of prior art, the object of the present invention is to provide a kind of working head to have the power tool of high hunting frequency.

Be the ground that achieves the above object, the technical scheme that the present invention takes is:

A kind of power tool comprises: housing; Be arranged on motor and transmission mechanism in the housing; Relative housing produces the working head of oscillating motion under the driving of motor and transmission mechanism; The hunting frequency of said working head is more than or equal to 20000 times/minute.

Preferably, the hunting frequency of said working head 20000 times/assign between 45000 times/minute.

Preferably, the hunting frequency of said working head 30000 times/assign between 35000 times/minute.

Preferably, said power tool is provided with cooling back installation.

Preferably, said housing is provided with the fin that increases area of dissipation.

Preferably; Said power tool also comprises controller; The operating voltage and the load current of the said motor of said monitoring control devices; And calculate according to the load current of said motor and to reach the required target voltage of preset rotation speed, adjust operating voltage to the said target voltage of said motor, make said motor constant rotation under preset rotation speed.

Preferably, said power tool is provided with pipeline, and said pipeline sprays cooling medium to said working head.

Preferably, said power tool also comprises the output shaft that in said housing, extends, and said output shaft drives at said motor and transmission mechanism and centers on self axial line down and do oscillating motion, and the free end of said output shaft connects said working head.

Preferably, said motor has motor shaft, is connected with eccentric wheel and pull-fork assembly between said motor shaft and the said output shaft, makes output shaft center on self axial line and does oscillating motion.

Preferably, the quality of said working head is smaller or equal to 20g.

Preferably, said working head is provided with perforate.

The working head hunting frequency of the hunting frequency instrument more powered by conventional energy of the working head of power tool provided by the invention improves greatly, and this can improve work quality and operating efficiency greatly.

Description of drawings

Do further explain below in conjunction with accompanying drawing and the preferred embodiments of the present invention.

Fig. 1 is the schematic perspective view of power tool provided by the invention, only expresses the fore-end of this power tool among the figure.

Fig. 2 is the generalized section of swing power tool shown in Figure 1.

Wherein, the related elements reference numeral is following:

10. power tool 11. housings 12. output shafts

13. motor 14. upper bearing (metal)s 15. lower bearings

16. fork 161,162. adjutages 17. eccentric wheels

18. motor shaft 30. working heads 112. cooling back installations

114. jog 5. working head cooling devices 51. pipelines

52. shower nozzle 181. cam pins 182. motor shaft bearings

53. tank for coolant

The specific embodiment

Below in conjunction with the accompanying drawing and the specific embodiment the present invention is done further detailed description.

See also Fig. 1 to Fig. 2, a kind of power tool 10, the power tool 10 of present embodiment is an oscillating machine, it comprises the housing 11 that roughly is the angle setting; Housing 11 set inside have motor 13, and motor 13 has motor shaft 18, and motor crankshaft holds 182 pairs of motor shafts 18 and play supporting role, and bearing 182 can use common ball bearing; Preferably use when high rotating speed is provided, it is little to rub, resistant to elevated temperatures bearing; Like air-bearing, fluid bearing etc., these bearings utilize gas or liquid as lubricant; Resistance is lower, allows high rotational speed, keeps lower level of vibration simultaneously; Resistance is little and then rub for a short time, and the heat of power loss and generation is little, and is less thereby temperature rises.Certainly, not only the motor shaft bearing can use air-bearing, fluid bearing, and other bearing also can use air-bearing, fluid bearing.From the extended output shaft 12 of front end (right side is defined as front end among the figure) of housing 11, output shaft 12 is fixedly coupled in housing 11 through being arranged on housing 11 inner two

bearings

14,15 up and down, and output shaft 12 also has been fixedly coupled shift fork 16; Shift fork 16 has two and is the adjutage 161,162 that is oppositely arranged; At these two adjutages 161, between 162, and fit tightly adjutage 161,162 and be provided with an eccentric wheel 17, eccentric wheel 17 is sheathed to be connected on the cam pin 181 on the motor shaft 18 of motor 13; Be provided with and make eccentric wheel 17 be eccentric with respect to motor shaft 18; After motor 13 drove, motor shaft 18 will drive eccentric wheel 17 and do eccentric rotation with respect to motor shaft 18, again because shift fork 16 closely contacts with eccentric wheel 17; So; Shift fork 16 can be under the driving of eccentric wheel 17, drives output shaft 12 and does oscillating motion around himself axis X, and the direction of motion is shown in the double-head arrow among Fig. 1.

At this moment, if after being connected with different annex working heads 30 on the free end of output shaft 12,, just can realize operations such as cutting, grinding like straight blade, saw blade or triangle frosted dish or the like.

The hunting frequency of present embodiment output shaft 12 is more than or equal to 20000 times/minute, and is preferred, the hunting frequency of output shaft 12 20000 times/assign between 45000 times/minute.Preferred, the hunting frequency of output shaft 12 30000 times/assign between 35000 times/minute.For example, the hunting frequency of present embodiment output shaft 12 is 32000 times/minute, and the hunting frequency of output shaft 12 improves greatly; After output shaft 12 connected cutting working head such as saw blade, the frequency of saw blade swing was 32000 times/minute, because saw blade is when cutting; Inevitably can on workpiece, stay tool marks, when the frequency of saw blade swing is accelerated, shortened the blanking time between the adjacent cutting twice; Thereby the spacer defection of the tool marks that saw blade stays on surface of the work is shortened greatly, and this can improve the surperficial cutting accuracy of workpiece greatly, in addition; The saw blade hunting frequency is accelerated; The linear velocity of saw blade is accelerated, thereby accelerated the feed speed of saw blade on workpiece, this can improve cutting efficiency greatly.On the basis that the feed speed of saw blade and cutting accuracy improve, the feeding meeting of user's propulsion power instrument on workpiece is lighter, uses more convenient.When output shaft 12 connects polishing type working heads, during like triangle frosted dish, when the hunting frequency of frosted dish is 32000 times/timesharing, the stock removal one in the unit interval regularly can improve the polishing precision greatly.The hunting frequency of frosted dish is accelerated, and also can accelerate to polish efficient.When output shaft 12 connects other working heads, can increase work efficiency and work quality equally.

After the hunting frequency of working head improved, if the quality of working head is bigger, then swing in high frequency may cause damage to output shaft 12; For avoiding this harm; The quality of present embodiment working head for reducing the quality of working head, can use light material to make working head smaller or equal to 20g; As making the saw blade cutter hub, the quality that perforate alleviates working head can also be set on working head with titanium alloy.

Output shaft 12 hunting frequencies improve, and need motor 13 high speed operations, and motor 13 temperature will raise; This will influence the life-span of motor 13, and the temperature of motor 13 raises, and the temperature of housing 11 also will raise; May iron the user, for addressing this problem, present embodiment is provided with cooling back installation 112 at housing 11 inner surfaces; Circulating water cooling device for example, this circulating water cooling device comprises a plurality of pipelines that are arranged on the housing, water constantly circulates in pipeline; Thereby the temperature with housing heat-shift reduction housing is provided with sealable water filling port outside housing 11, and temperature raise after water used a period of time; Can change water this moment through this water filling port, and certainly, cooling medium also can use other bigger any media of specific heat.Housing 11 is preferred by the good material of heat dispersion; Process like aluminium, magnesium alloy etc.; For further reducing the temperature of housing 11, also some jogs 114 can be set on housing 11 surfaces, to increase the area of dissipation of housing; The form of present embodiment jog is a fin, and the jog of other form also can be realized this function.Preferably; Cooling back installation and/or jog can be arranged on the part that housing 11 is accommodated motor and transmission mechanism; But be not limited thereto, for example, cooling back installation lowered the temperature to it like motor shaft bearing 182 and bearing thereof etc. to the higher parts of temperature in power tool 10 courses of work.Certainly, cooling back installation and concave surface protuberance can use separately.Present embodiment can also adopt alternate manner that power tool is lowered the temperature; As plural fan is installed in housing to the parts in the housing; As motor is lowered the temperature; Fan also is installed to housing outer surface and working head cooling outside housing, these fans can also can use independent motor to drive directly by motor-driven.

For working head is moved under the hunting frequency of approximately constant; Be provided with controller in the power tool 10 of present embodiment; The operating voltage and the load current of its monitoring motor 13, and calculate motor 13 according to the load current of motor 13 and reach the required target voltage of preset rotation speed, the operating voltage of adjustment motor 13 is to target voltage; Thereby make motor 13 constant rotation under preset rotation speed, obtain stable performance.

Working head 30 swing in high frequency, temperature will raise in the course of work, and this can constitute influence to the life-span of working head, the high temperature when working for reducing working head, present embodiment housing 11 is provided with working head cooling device 5.Particularly, this working head cooling device 5 comprises pipeline 51, shower nozzle 52 and tank for coolant 53, thereby cooling medium sprays to working head 30 from tank for coolant 53 through pipeline 51 and shower nozzle 52 working head is lowered the temperature.Cooling medium is preferably gas, and this refrigerating gas can not block the causing of operating position of working head after spraying to working head, and can be with the chip workpiece that blows off, and using gases can be adorned Compressed Gas in the tank for coolant during as cooling medium.Cooling medium also can use liquid, when using cooling fluid, and preferred nonconducting material; Can not cause electric leakage like this and cause danger; Certainly under situation about carrying out, also can use the simplest water as cooling fluid, when using cooling fluid, because cooling fluid may be blocked the operating position of working head to the live part sealing; Preferably in the place ahead of working head 30 cooling fluid spray less than the place other guider is set, like laser guide etc.Present embodiment can also have some alternatives, during like using gases cooling saw blade, can not use the Compressed Gas that is stored in the tank for coolant 53, and use air blast or fan that saw blade is cooled off in the saw blade blowing.

The working head hunting frequency of the more conventional swing type power tool of the hunting frequency of the working head of power tool improves greatly; This can be accomplished in several ways; As select high output speed motor for use, as reaching the hunting frequency that working head needs through the speed reducing ratio that changes between motor shaft and the output shaft.In a word, as long as rationally select for use motor and/or reasonable disposition speed reducing ratio just can reach desirable working head hunting frequency.

For a long time; Those skilled in the art think that the working head hunting frequency raising of power tool can bring some insurmountable problems; Like high temperature to influence of service life of a machine etc.; Present embodiment adopts multiple mode that power tool 10 is lowered the temperature; Adopt some other measures reply hunting frequencies to improve some other problems that may bring simultaneously, obtaining to have avoided some problems that possibly occur when the working head hunting frequency improves the high workload quality brought and high workload efficient, make hunting frequency be able to enforcement more than or equal to 20000 times/minute power tool.

Present embodiment is an example with multi-functional oscillating machine, and other swing type electric tool, and like skin grinder, swings such as an electric angle grinder type power tool all can adopt technical scheme of the present invention, thereby reaches the purpose that improves work quality and efficient.The technical scheme of all employing equivalents or equivalence replacement is all in protection scope of the present invention.

Claims

1. power tool comprises:

Housing;

Be arranged on motor and transmission mechanism in the housing;

Relative housing produces the working head of oscillating motion under the driving of motor and transmission mechanism;

It is characterized in that: the hunting frequency of said working head is more than or equal to 20000 times/minute.

2. power tool as claimed in claim 1 is characterized in that: the hunting frequency of said working head 20000 times/assign between 45000 times/minute.

3. power tool as claimed in claim 1 is characterized in that: the hunting frequency of said working head 30000 times/assign between 35000 times/minute.

4. power tool as claimed in claim 1 is characterized in that: said power tool is provided with cooling back installation.

5. power tool as claimed in claim 1 is characterized in that: said housing is provided with the fin that increases area of dissipation.

6. power tool as claimed in claim 1; It is characterized in that: said power tool also comprises controller; The operating voltage and the load current of the said motor of said monitoring control devices; And calculate according to the load current of said motor and to reach the required target voltage of preset rotation speed, adjust operating voltage to the said target voltage of said motor, make said motor constant rotation under preset rotation speed.

7. power tool as claimed in claim 1 is characterized in that: said power tool is provided with pipeline, and said pipeline sprays cooling medium to said working head.

8. power tool as claimed in claim 1; It is characterized in that: said power tool also comprises the output shaft that in said housing, extends; Said output shaft drives at said motor and transmission mechanism and centers on self axial line down and do oscillating motion, and the free end of said output shaft connects said working head.

9. power tool as claimed in claim 7 is characterized in that: said motor has motor shaft, is connected with eccentric wheel and pull-fork assembly between said motor shaft and the said output shaft, makes output shaft center on self axial line and does oscillating motion.

10. power tool as claimed in claim 1 is characterized in that: the quality of said working head is smaller or equal to 20g.

11. power tool as claimed in claim 10 is characterized in that: said working head is provided with perforate.