CN102092036B

CN102092036B - Swing power tool

Info

Publication number: CN102092036B
Application number: CN 200910258265
Authority: CN
Inventors: 王勇
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2009-12-14
Filing date: 2009-12-14
Publication date: 2012-12-19
Anticipated expiration: 2029-12-14
Also published as: CN102092036A

Abstract

The invention discloses a swing power tool, which comprises a shell, a motor, an output shaft, a first swing mechanism, a balance weight, and a second swing mechanism, wherein the motor is accommodated in the shell and is provided with a motor shaft; the motor shaft rotates around an axis of the motor shaft; the output shaft extends out of the shell, and swings around an axial lead of the output shafts; the first swing mechanism comprises an eccentric wheel connected to the motor shaft, and a shifting fork component connected to the output shaft; the first swing mechanism converts the rotary motion of the motor shaft into pendulum motion of the output shaft; the balance weight is arranged on the output shaft; the second swing mechanism comprises a second eccentric wheel connected to the motor shaft, and a second shifting fork component connected to the balance weight, and converts the rotary motion of the motor shaft into pendulum motion of the balance weight; the first eccentric wheel has a first axis, and the second eccentric wheel has a second axis; and the first axis and the second axis are relatively parallel and are respectively positioned on two opposite sides of the axis of the motor shaft. A dynamic balance state can be realized between the two kinds of pendulum motion, and the shock of the output shaft is reduced.

Description

The swing power tool

Technical field

The present invention relates to a kind of swing power tool, especially a kind of swing power tool of hand-held.

Background technology

Multi Role Aircraft is the swing power tool of the common hand-held of industry, and its operation principle is that the axial line that output shaft centers on self is done oscillating motion.Therefore, when the user is being equipped with different annex working heads on the output shaft after, can realize multiple different operation.Common annex working head comprises straight blade, saw blade, triangle frosted dish, shovel type scraper etc., can realize like work requirements such as sawing, cut, grind, scrape.

But output shaft each position in the course of the work is with respect to the axial line X of output shaft; Therefore the certain angle that has been beat all is unbalanced on each position, further says; Output shaft always is in unbalanced duty; Feasible vibrations are bigger, and seismaesthesia is stronger, for user's long-time use has caused inconvenience.

Summary of the invention

The object of the present invention is to provide a kind of swing power tool, can keep dynamic equilibrium at work, make seismaesthesia less.

For realizing above-mentioned purpose, the invention provides a kind of swing power tool, comprising: housing; Motor is housed in the housing, and has motor drive shaft, and said motor drive shaft rotates around self axis; Output shaft extends in housing, and does oscillating motion around the axial line of self; First swing mechanism comprises the eccentric wheel that is connected on the motor drive shaft and is connected the pull-fork assembly on the output shaft that said first swing mechanism is converted into rotatablely moving of motor drive shaft the oscillating motion of output shaft; Said swing power tool also comprises the balance weight that is set on the output shaft; Second swing mechanism comprises second eccentric wheel that is connected on the motor drive shaft and is connected second pull-fork assembly on the balance weight that said second swing mechanism is converted into rotatablely moving of motor drive shaft the oscillating motion of balance weight; Said eccentric wheel has first axle, and said second eccentric wheel has second axis, the said first axle and the second axis opposing parallel and lay respectively at the relative both sides of motor drive shaft axis.

In the embodiment of optimizing:

Said output shaft produces when counterclockwise swinging, and said balance weight produces the clockwise direction swing.

When said output shaft produced the clockwise direction swing, said balance weight produced swing counterclockwise.

Said second eccentric wheel is between eccentric wheel and motor.

Said balance weight is cylindric.

Said mass of balance block and output shaft are suitable.

Said second pull-fork assembly comprises horizontally disposed main body and perpendicular to the U type adjutage of main body, said adjutage closely contacts with second eccentric wheel.

Swing power tool among the present invention; Owing to increased by second eccentric wheel and second pull-fork assembly; And sheathed balance weight on output shaft, thereby when output shaft was done oscillating motion around the axial line of himself, the axial line around output shaft that balance weight can be same was done oscillating motion; But can realize a kind of dynamic balance state between two oscillating motions, help to alleviate the seismaesthesia on the output shaft.

Description of drawings

Fig. 1 is the sketch map of swing mechanism in the preferred embodiment of the present invention.

Fig. 2 is an eccentric structural representation in the swing mechanism.

Fig. 3 is the structural representation of first swing mechanism.

Fig. 4 is the structural representation of second swing mechanism.

Fig. 5 is the user mode reference diagram of swing power tool, and at this moment, output shaft is along counterclockwise doing oscillating motion, and balance weight is then done oscillating motion along clockwise direction simultaneously.

Fig. 6 is the user mode reference diagram of swing power tool, and at this moment, output shaft is done oscillating motion along clockwise direction, and balance weight is then along counterclockwise doing oscillating motion simultaneously.

Related elements reference numeral in the diagram is following:

10, housing 11, motor 12, motor drive shaft

13, output shaft 14, eccentric wheel 141, interior circle

142, cylindrical 143, ball bearing 15, pull-fork assembly

151, adjutage 152, adjutage 20, balance weight

24, second eccentric wheel 25, second pull-fork assembly, 251 main bodys

252, adjutage 253, adjutage axial line X

The motor drive shaft axis A first axle B second axis C

The specific embodiment

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

See also Fig. 1, a kind of swing power tool comprises being the housing 10 that angle is provided with haply that be housed in the motor 11 in the housing 10, said motor 11 has motor drive shaft 12, and motor drive shaft 12 is around himself axis, and promptly motor drive shaft axis A rotates.Extend in housing 10 with motor drive shaft 12 vertical output shafts 13, and do oscillating motion around self axial line X.

The swing mechanism of realizing the oscillating motion that rotatablely moving of motor drive shaft 12 is converted into output shaft 13 has adopted the eccentric wheel of being used always in the swing power tool to add the mode of pull-fork assembly.Promptly at the free end of motor drive shaft 12; Be connected with eccentric wheel 14, please consult Fig. 2 in the lump, circle 141 and cylindrical 142 in eccentric wheel 14 has; With the ball bearing 143 between circle 141 and the cylindrical 142 in being arranged on; But the center of circle of interior circle 141 and cylindrical 142 does not overlap, and presents certain biasing, and wherein the axial line of cylindrical 142 is first axle B.When interior circle 141 connects motor drive shaft 12, along with the rotation of motor drive shaft 12, whole eccentric wheel 14 will be eccentric rotation.On output shaft 13, be provided with pull-fork assembly 15 along horizontal direction, the free end of pull-fork assembly 15 is formed with the adjutage 151,152 of U type, and is as shown in Figure 3.These two adjutages 151,152 are coated on the cylindrical 142 of eccentric wheel 14 and closely contact.Thereby when eccentric wheel 14 when doing eccentric rotation, with driving the swing that pull-fork assembly 15 produces on the horizontal directions, further drive output shaft 13 again and do oscillating motion around self axial line X.

Please continue to consult Fig. 1, said swing power tool also comprises a balance weight 20, and it roughly is cylindric, and quality and output shaft 13 are suitable haply.It is set on the output shaft 13 closely and can does oscillating motion with respect to the output shaft 13 same axial line X that center on, and specifically realizes through another group swing mechanism.

On motor drive shaft 12; Between eccentric wheel 14 and motor 11, also be provided with second eccentric wheel 24; Second eccentric wheel 24 here is identical with the structure of eccentric wheel 14, but the axial line of its cylindrical is the second axis C, and is as shown in fig. 1; The first axle B and the second axis C lay respectively at the both sides of motor drive shaft axis A, promptly have 180 ° phase difference.Same, on balance weight 20, also be provided with second pull-fork assembly 25.Different with pull-fork assembly 15 is that second pull-fork assembly 25 comprises the main body 251 and vertical and U type adjutage 252,253 main body 251 that is provided with along horizontal direction, and is as shown in Figure 4.These two adjutages 252,253 are coated on the cylindrical of second eccentric wheel 24 and closely contact.Thereby when second eccentric wheel 24 when doing eccentric rotation, with driving the swing that second pull-fork assembly 25 produces on the horizontal directions, further drive balance weight 20 again and do oscillating motion around axial line X.

Need to prove especially; Because the phase difference that has 180 ° between the eccentric wheel 14 and second eccentric wheel 24; When eccentric wheel 14 and second eccentric wheel 24 produce off-centre rotation separately under the driving of motor drive shaft 12; The output shaft 13 that is connected with eccentric wheel 14 and with balance weight 20 that second eccentric wheel 24 is connected between the swing that produces also will produce 180 ° phase difference, shown in Fig. 5 a and Fig. 5 b, promptly in output shaft 13 generations during to anticlockwise swing; The balance weight 20 that is set on the output shaft 13 will produce to clockwise swing; Same, when output shaft 13 produces to clockwise swing, the balance weight 20 that is set on the output shaft 13 will produce to anticlockwise swing.

At this moment, if on output shaft 13, be connected with the working head annex, the vibrations that then bring because of eccentric swing on the output shaft 13 will be balanced piece 20 and balance out dynamically, thereby make whole a kind of dynamic equilibrium that produces, and help to alleviate seismaesthesia.

Claims

1. swing power tool for one kind, comprising:

Housing (10);

Motor (11) is housed in the housing (10), and has motor drive shaft (12), and said motor drive shaft (12) rotates around self axis;

Output shaft (13) extends in housing (10), and does oscillating motion around the axial line of self;

First swing mechanism comprises the eccentric wheel (14) that is connected on the motor drive shaft (12) and is connected the pull-fork assembly (15) on the output shaft (13) that said first swing mechanism is converted into the oscillating motion of output shaft (13) with rotatablely moving of motor drive shaft (12);

It is characterized in that:

Said swing power tool also comprises the balance weight (20) that is set on the output shaft (13);

Second swing mechanism comprises second eccentric wheel (24) that is connected on the motor drive shaft (12) and is connected second pull-fork assembly (25) on the balance weight (20) that said second swing mechanism is converted into the oscillating motion of balance weight (20) with rotatablely moving of motor drive shaft (12),

Said eccentric wheel (14) has first axle, and said second eccentric wheel (24) has second axis, the said first axle and the second axis opposing parallel and lay respectively at the relative both sides of motor drive shaft axis.

2. swing power tool as claimed in claim 1 is characterized in that: when said output shaft (13) produced anticlockwise swing, said balance weight (20) produced clockwise swing.

3. swing power tool as claimed in claim 1 is characterized in that: when said output shaft (13) produced clockwise swing, said balance weight (20) produced anticlockwise swing.

4. swing power tool as claimed in claim 1 is characterized in that: said second eccentric wheel (24) is positioned between eccentric wheel (14) and the motor (11).

5. swing power tool as claimed in claim 1 is characterized in that: said balance weight (20) is cylindric.

6. swing power tool as claimed in claim 1 is characterized in that: the quality of said balance weight (20) and output shaft (13) are suitable.

7. swing power tool as claimed in claim 1; It is characterized in that: said second pull-fork assembly (25) comprises horizontally disposed main body (251) and perpendicular to the U type adjutage (252,253) of main body (251), said adjutage (252,253) closely contacts with second eccentric wheel (24).