WO2012041211A1

WO2012041211A1 - Oscillating power tool

Info

Publication number: WO2012041211A1
Application number: PCT/CN2011/080193
Authority: WO
Inventors: 王勇; 何明明; 付涛; 周昶; 田角峰
Original assignee: 苏州宝时得电动工具有限公司
Priority date: 2010-10-01
Filing date: 2011-09-27
Publication date: 2012-04-05

Abstract

An oscillating power tool comprises a casing, an electric motor arranged inside of the casing, a motor shaft and an output shaft driven by the electric motor, and an eccentric drive mechanism arranged between the motor shaft and the output shaft. The eccentric drive mechanism can be selectively switched between at least two working modes. Different working modes of the eccentric drive mechanism provide the output shaft with different oscillation angles, thereby enabling an oscillating power tool to satisfy different functional requirements and be applicable to different work environments.

Description

Swing power tool technology field

The present invention relates to a power tool, and more particularly to a swing power tool.

Background technique

The multi-function machine is a common hand-held oscillating power tool in the industry. It works by swinging the output shaft around its own axis. Therefore, when the user installs different head attachments on the output shaft, a variety of different operating functions can be implemented. Common head attachments include straight saw blades, circular saw blades, triangular sanding discs, scrapers, etc., which can be used for sawing, cutting, grinding, scraping, etc.

1 and 2, a conventional swinging power tool 100' includes a casing Γ, a drive shaft 2' extending from the casing 、, a motor 1 设置 disposed in the casing Γ, and a motor 1 Γ Driven spindle 4'. The main shaft 4' is connected at one end with a connecting shaft 41' offset from its axis, and the connecting shaft 4 is mounted with a bearing 8' having a spherical outer surface 8Γ. A shift fork 7' is provided between the main shaft 4' and the drive shaft 2', and one end of the shift fork 7' is pivotally coupled to the drive shaft 2', and the other end is formed with a pair of arms 71' on both sides of the bearing 8'. The drive shaft 2' is substantially perpendicular to the axis of the main shaft 4', and the outer surface 8' of the bearing 8' is in close contact with the inner surface of the arm portion 71' of the shift fork 7'. When the main shaft 4' rotates about its axis, the rotation of the drive shaft 2' around its own axis within a certain swing angle is caused by the cooperation of the bearing 8' and the shifting fork 7', thereby driving the drive shaft 2 to be mounted on the drive shaft 2 'The tool head 6' reciprocates.

When the oscillating power tool 100' is in operation, the bearing 8' is rotated about the axis of the main shaft 4' by the connecting shaft 41', and the area of the fork 7' for contacting the bearing 8' remains unchanged, therefore, the oscillating power The drive shaft 2' of the tool 100' can only oscillate over a fixed range of swing angles. In use, the user usually wants the swing power tool 100' to output different swing angles to meet more functional applications. For example, when the oscillating power tool 100' is used to mount a straight saw blade to groove on wood materials of different hardnesses, if the hardness of the wood material is low, the drive shaft 2' outputs a commonly used small swing angle; When the hardness is high, the wood chips are not easily discharged at a small swing angle, so that the straight saw blade is easily caught, and the drive shaft 2' is required to output a large swing angle. Obviously, the oscillating power tool 100' has been unable to meet this demand. For this reason, it is indeed necessary to provide an improved oscillating power tool to overcome the deficiencies of the above-described oscillating power tool. Summary of the invention

In view of the deficiencies of the prior art, it is an object of the present invention to provide an oscillating power tool having different oscillating angles.

The technical solution adopted by the present invention to solve the technical problem thereof is: an oscillating power tool, comprising: a casing, a motor disposed in the casing, an eccentric transmission mechanism driven by the motor, and the eccentric transmission mechanism driving and surrounding the eccentric transmission mechanism An output shaft whose own axis performs a rotary reciprocating oscillating motion, wherein: the oscillating power tool includes an adjusting device that can drive the eccentric transmission mechanism to switch between different operating modes, so that the output shaft has different swing angles .

Preferably, the eccentric transmission mechanism includes a shift fork and a driving member connected to a motor shaft of the motor, and one or two of the shifting forks are coupled to the output shaft, and the other end of the shifting fork is The driving member is matched, and the driving member can be engaged with different positions of the fork under the driving of the adjusting device.

Preferably, the shifting fork has a mating portion that cooperates with the driving member, the engaging portion extends along an axial direction of the motor shaft, and the adjusting device drives the driving member to face the axis of the motor shaft Sliding of the mating portion of the fork

Preferably, the eccentric transmission mechanism includes a shift fork and a first driving member and a second driving member spaced apart from each other on a motor shaft of the motor, and the shifting fork is provided with a first driving member and The eccentric transmission mechanism of the first engaging portion and the second engaging portion of the second driving member has a first working mode and a second working mode, and when the eccentric transmission mechanism is in the first working mode, the first The driving member cooperates with the first mating portion of the shift fork; when the eccentric transmission mechanism is in the second working mode, the second driving member cooperates with the second mating portion of the shift fork

Preferably, an eccentric shaft is connected to the motor shaft, and the driving member is mounted on the eccentric shaft, and the eccentric shaft is axially slidable relative to the motor shaft.

Preferably, the adjusting device comprises a push button and a lever connected to the push button. The push button can drive the lever to drive the driving member to move relative to the fork.

Preferably, the oscillating power tool is provided with a speed adjusting device that adjusts a swing frequency of the output shaft when a swing angle of the output shaft changes, and the speed adjusting device includes gear position adjustment a circuit and a controller, wherein the controller adjusts a speed of the motor through the gear position adjusting circuit when a swing angle of the output shaft changes

Preferably, the oscillating power tool includes a power source, the motor has at least one preset rotation speed, and the oscillating power tool is provided with a steady speed control system for constantly rotating the motor at the preset rotation speed, the steady speed The control system includes a controller and a power switch unit for connecting the power source and the motor, the control measures an operating voltage and a load current of the motor, and calculates a required speed to reach a preset speed according to a load current of the motor a target voltage, adjusting an operating voltage of the motor to the target voltage, causing the motor to rotate constantly at a preset speed

Preferably, the preset speed of the motor is above 100 rpm.

Another technical solution adopted by the present invention to solve the technical problem thereof is: an oscillating power tool comprising a casing, a motor disposed in the casing, an eccentric transmission mechanism driven by the motor, and driven by the eccentric transmission mechanism An output shaft that reciprocates an oscillating motion about its own axis, wherein the eccentric transmission has at least two operating modes, the output shaft having different oscillating angles when the eccentric transmission is in different operating modes.

The utility model has the beneficial effects that: the oscillating power tool of the invention can oscillate the output shaft in different swing angles by setting an eccentric transmission mechanism that can be switched between different working modes, thereby meeting different functional requirements and being applied to different Work place.

The invention also provides a swaying power tool with higher working efficiency.

The technical solution adopted by the present invention to solve the technical problem thereof is: an oscillating power tool, comprising: a casing, a motor disposed in the casing, an eccentric transmission mechanism driven by the motor, and the eccentric transmission mechanism driving and surrounding the eccentric transmission mechanism The output shaft of the reciprocating oscillating motion of its own axis. Wherein the swing angle of the output shaft is greater than 4 °

Preferably, the output shaft has a swing frequency greater than 1 0000 per minute.

Preferably, the eccentric transmission mechanism is selectively switchable between at least a first working mode and a second working mode, and when the eccentric transmission mechanism is in different working modes, the output shaft has different swinging angles, The oscillating power tool also includes adjustment means that can drive the eccentric transmission to switch between the first mode of operation and the second mode of operation.

Preferably, the eccentric transmission mechanism includes a shift fork and an eccentric member connected to the motor shaft, one end of the shift fork is connected to the output shaft, and the other end of the shift fork is The eccentric members are matched, and the eccentric member can be engaged with different positions of the fork under the driving of the adjusting device.

Preferably, the shifting fork has a mating portion that cooperates with the eccentric member, the mating portion extends along an axial direction of the motor shaft, and the adjusting device drives the eccentric member to be opposite to the axis of the motor shaft. The mating portion of the shift fork slides.

Preferably, the eccentric transmission mechanism includes a shift fork and a first eccentric member and a second eccentric member spaced apart from each other on a motor shaft of the motor, and the shift fork is provided with a first eccentric member and The first eccentric portion and the second eccentric portion of the second eccentric member cooperate with the eccentric transmission mechanism having a first working mode and a second working mode, when the eccentric transmission mechanism is in the first working mode, The first eccentric member cooperates with the lance engaging portion of the shift fork; and when the eccentric transmission mechanism is in the second working mode, the lance-eccentric member cooperates with the second engaging portion of the shift fork.

Preferably, the oscillating power tool is provided with frequency matching means for adjusting the oscillating frequency of the output shaft when the swing angle of the output shaft changes.

Preferably, the frequency matching means includes a gear position adjusting circuit and a controller, and the controller adjusts the rotational speed of the motor through the gear position adjusting circuit when the swing angle of the output shaft is changed.

Preferably, the adjusting device comprises a push button disposed at the outer portion of the casing and a lever connected to the push button, and the push button can drive the lever to drive the eccentric member relative to the dial Fork movement

Preferably, the motor has at least one preset rotational speed, and the oscillating power tool is provided with a steady speed control system for constantly rotating the motor at the preset rotational speed.

Preferably, the steady speed control system includes: a power supply; a controller that monitors an operating voltage and a load current of the motor, and calculates a standard voltage of the motor according to a load current of the motor, and then according to the a difference between the operating voltage and the target voltage to specify a duty cycle of the operating voltage; and a power switching unit that connects the power source and the motor to the power switch unit to specify the operation of the controller A duty cycle of the voltage is applied to the motor to adjust the operating voltage of the motor to the target voltage.

Preferably, the preset speed of the motor is more than 1 0000 revolutions per minute.

Preferably, the casing is provided with a mechanism for reducing the operation of the oscillating power tool A vibrating elastic member.

Preferably, the casing includes a head casing, one end of the head casing extending a side wall in a direction of the output shaft, and the elastic member is radially connected between the output shaft and the side wall.

Preferably, the casing includes a head casing, the head casing is provided with a pressure plate perpendicular to the output shaft, and an end of the output shaft is provided with a flange portion, and the elastic member is axially sleeved on the output. The flange portion and the pressure plate are respectively abutted on the shaft and at both ends.

Preferably, the eccentric transmission mechanism includes an eccentric portion of the fork and the driving fork reciprocatingly swinging, and the shifting fork includes a first portion connected to the output shaft and cooperates with the eccentric member

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The second end, 3⁄4, includes two oppositely disposed outer walls, between the outer wall of the fork and the head, and the elastic members are respectively disposed in the swinging direction of the fork.

Preferably, the output shaft is coupled with a bracket, and an elastic member is disposed between the bracket and the housing.

Preferably, the elastic member is divided into a first elastic member and a second elastic member, and the bracket has a first side wall and a second side wall opposite to the housing, and the first elastic member and the second elastic member are respectively disposed at Between the first side wall, the second side wall and the housing, the first elastic member and the second elastic member press the bracket in opposite directions

Preferably, the minimum swing angle of the output shaft is one of 5 ⁰ 6 ° 7 ° 8 ° 9 or 10 °.

Preferably, the swing angle of the output shaft is greater than 10 °

Preferably, the input power of the motor is greater than 500 W

Preferably, the casing is provided with an operating handle.

Preferably, the eccentric transmission mechanism includes a shift fork and an eccentric member that drives the shifting fork to rotate and reciprocate, the eccentric member being a bearing and having a ratio of an outer diameter to an inner diameter of more than 1 9/7.

The beneficial effects of the present invention are: The oscillating power tool of the present invention increases the working efficiency of the oscillating power tool by increasing the swing angle of the output shaft, and allows the oscillating power tool to expand more application functions.

The present invention further provides a steady speed control system for a power tool that allows the motor of the power tool to rotate at an approximately constant preset speed.

In order to achieve the above object, the technical solution adopted by the present invention is as follows: A steady speed control system for a power tool, the power tool including a power source and a motor, the motor having At least one preset speed. The steady speed control includes a controller and a power switch unit that connects the power source and the motor, wherein the controller monitors an operating voltage and a load current of the motor, and calculates a preset speed according to a load current of the motor. The required target voltage is adjusted to the target voltage of the motor to cause the motor to rotate constantly at a preset speed.

Preferably, the controller specifies a corresponding duty ratio according to a difference between the working voltage and the target voltage, and applies the duty ratio to the power switch unit to adjust an operating voltage of the motor to a target. Voltage.

Preferably, the operating voltage of the motor is detected by a differential amplifying circuit and input to the controller

Preferably, the load current of the motor is detected by a current sampling amplifying circuit and input to the controller.

Preferably, the power switch unit includes a metal-oxide-semiconductor-field effect transistor MOS FE T (referred to as a MOS transistor) connected in series between the power source and the motor, and the MOS transistor is in an on-off state. Switch between to change the size of the duty cycle.

Another object of the present invention is to provide an oscillating power tool that is rotatable at an approximately constant preset speed.

In order to achieve the above object, the technical solution adopted by the present invention is as follows: a power tool comprising: a power source; a motor having a motor shaft, the motor having at least one preset speed; an output shaft for mounting the working head; an eccentric transmission mechanism, And rotating between the motor shaft and the output shaft to convert the rotation of the motor shaft into a rotary reciprocating swing of the output shaft; a controller, and a power switch unit that connects the power source and the motor. The controller monitors an operating voltage and a load current of the motor, and calculates a target voltage required to reach a preset speed according to a load current of the motor, and adjusts an operating voltage of the motor to the standard voltage, so that The motor rotates constantly at a preset speed.

Preferably, the power switch unit includes a metal-oxide-semiconductor-field effect transistor MOS FE T (referred to as a MOS transistor) connected in series between the power source and the motor, and the MOS transistor is in an on-off state. Switch between to change the size of the duty cycle. Preferably, the oscillating power tool includes adjustment means that can drive the eccentric transmission to switch between different operating modes such that the output shafts have different oscillating angles.

Preferably, the oscillating power tool is provided with a speed adjusting device that adjusts a swing frequency of the output shaft when a swing angle of the output shaft changes, the speed adjusting device includes a gear position adjusting circuit and a controller, when When the swing angle of the output shaft changes, the controller adjusts the rotational speed of the motor through the gear position adjustment circuit.

Compared with the prior art, the beneficial effects of the present invention are: By directly detecting the working voltage and the load current at both ends of the motor, the motor of the power tool can be maintained at an approximately constant rotational speed without setting a speed sensor, and the structure is simple and the performance is better. stable. Attachment

Figure 1 is a schematic cross-sectional view of a conventional oscillating power tool.

Figure 2 is a partial structural view of the oscillating power tool shown in Figure 1.

3 is a schematic structural view of a first embodiment of a swing power tool according to the present invention.

Fig. 4 is a schematic view showing the state in which the eccentric transmission structure of the oscillating power tool shown in Fig. 3 is in the first working mode.

Figure 5 is a reference diagram of the state of use of the oscillating power tool shown in Figure 3, in which the output shaft and the saw blade are swung counterclockwise.

Figure 6 is a reference view of the state of use of the oscillating power tool shown in Figure 3, in which the output shaft and the saw blade and the saw blade are in the initial position.

Figure 7 is a reference diagram of the state of use of the oscillating power tool shown in Figure 3, in which the output shaft and the saw blade are swung clockwise.

Fig. 8 is a schematic view showing the state in which the eccentric transmission structure of the oscillating power tool shown in Fig. 3 is in the second working mode.

Figure 9 is a perspective exploded view of some components of the oscillating power tool shown in Figure 3.

Figure 10 is a top view of the eccentric transmission structure shown in Figure 4.

Figure 1 1 is a top view of the eccentric transmission structure shown in Figure 8.

Figure 1 2 is a schematic view showing the state in which the eccentric transmission structure is in the first working mode in the second embodiment of the present invention.

Fig. 13 is a schematic view showing the state in which the eccentric transmission structure shown in Fig. 12 is in the second working mode. Figure 14 is a perspective exploded view of a portion of the eccentric transmission structure of Figure 12; Figure 15 is a plan view of the eccentric transmission structure of Figure 12.

Figure 16 is a top view of the eccentric transmission structure shown in Figure 13.

Figure 17 is a block diagram showing the steady-state control system of the power tool of the present invention.

Figure 18 is a circuit diagram of the steady-speed control system shown in Figure 17.

Among them, the corresponding component corresponding number is as follows:

100 ', oscillating power tool 1', housing 11', , motor

2', drive shaft 4', spindle 41', . connecting shaft

6', tool head T, fork 71', . arm

8', bearing 8, 夕卜 surface 100, multi-function machine

1, the casing 2, the output shaft 3, the motor shaft

31. Eccentric shaft 311, flange part 312, first paragraph

313, second paragraph 32, receiving trough 4, eccentric transmission mechanism

5, saw blade 6, fork fork 61, casing

62, fork 621, extension arm 622, mating portion

623, inner side wall 7, drive member 71, outer casing

72, inner 圏 8, adjusting device 81, lever

82, push button 83, collar 91, motor shaft

911 receiving slot 92, output shaft 93, adjusting device

931, push button 932, lever 933, collar

94, fork 941, first mating part 942, second mating part

943, first inner side wall 944, second inner side wall 95, first driving member

96, the second drive member 97, the eccentric shaft 971, the flange portion

972, first paragraph 973, second paragraph 974, third paragraph

10, power supply 101, battery temperature detection circuit 102, battery voltage detection

11, motor 111, freewheeling tube 12, controller

13. Power switch unit 131, MOS transistor 132, MOSFET drive

14, the main switch 15, the step-down circuit 16, differential amplifier circuit

17, current sampling amplifier circuit 18, gear position adjustment circuit 19, angle sensor specific implementation

Next, a first embodiment of the present invention will be described first with reference to Figs. 3 to 8. Referring to FIG. 3 to FIG. 4, an oscillating power tool, in particular, a hand-held oscillating power tool, that is, a multi-function machine 100, includes a casing 1 and an output shaft 2 extending vertically from the casing 1 . Among them, a motor (not shown), a motor shaft 3 that is driven by the motor and horizontally disposed, and an eccentric transmission mechanism 4 provided between the motor shaft 3 and the output shaft 2 are disposed in the casing 1. The motor shaft 3 is substantially perpendicular to the output shaft 2, and the rotation of the motor shaft 3 is converted into a reciprocating swing of the output shaft 2 by the eccentric transmission mechanism 4. One end of the output shaft 2 is coupled to the eccentric transmission mechanism 4, and the other end is mounted with a working head. In the present embodiment, the working head is specifically a saw blade 5, and the output shaft 2 can drive the saw blade 5 to rotate around its own axis X. Reciprocating swing.

Referring to Figure 4, the eccentric transmission mechanism 4 includes a shift fork 6 and a drive member 7 coupled to the motor shaft 3, and the motor shaft 3 is mounted with an eccentric shaft 3 toward one end of the shift fork 6, and the drive member 7 is mounted on the eccentric shaft 3 1 . One end of the shift fork 6 is attached to the top end of the output shaft 2, and the other end is engaged with the driving member 7. The shift fork 6 includes a sleeve 6 1 sleeved on the output shaft 2 and a fork 62 extending horizontally from the side of the sleeve 6 1 toward the motor shaft 3. The drive member 7 is a ball bearing having an outer bore 7 1 and an inner bore 72, wherein the outer bore 7 1 has a spherical outer surface and the inner bore 72 is sleeved on the eccentric shaft 3 1 . The axis of the eccentric shaft 3 1 does not coincide with the axis of the motor shaft 3 and is radially offset by a certain amount. The fork 62 of the shift fork 6 is generally U-shaped and includes two oppositely disposed extension arms 62 1 . The ends of the two extending arms 62 1 are respectively provided with engaging portions 622 covering the two sides of the outer cymbal 7 1 of the driving member 7, the engaging portions 622 having substantially planar inner side walls 623, inner side walls 623 and outer cymbals 7 The outer surface of 1 is in tight sliding contact.

When the motor drive motor shaft 3 rotates, the eccentric shaft 3 1 rotates eccentrically with respect to the axis of the motor shaft 3 under the driving of the motor shaft 3, thereby driving the driving member 7 to rotate eccentrically with respect to the axis of the motor shaft 3. When the driving member 7 is eccentrically rotated, the outer fork 7 1 of the driving member 7 cooperates with the engaging portion 622 of the shifting fork 6 to drive the shifting fork 6 to generate a reciprocating swing about the axis X of the output shaft 2, further driving the output shaft 2 to surround Its own axis X makes a rotary reciprocating oscillating motion.

Referring to FIG. 5 to FIG. 7 , the process of the output shaft 2 driving the reciprocating rotation of the saw blade 5 will be described in detail. In the present embodiment, the saw blade 5 is horizontally mounted on the output shaft 2, and the longitudinal center line of the saw blade 5 is parallel to the axis of the motor shaft 3 when stationary. In operation, the output shaft 2 drives the saw blade 5 to rotate back and forth within a certain swing angle α. As shown in Fig. 5, the maximum swing angle of the saw blade 5 counterclockwise with respect to the axis of the motor shaft 3 is θ ° . When the saw blade 5 Swing counterclockwise to the maximum angle Θ. After that, the clockwise return swing is started. As shown in Fig. 6, the saw blade 5 will swing back to a position where its center line is parallel to the axis of the motor shaft 3. As shown in Figure 7, the blade 5 continues to swing clockwise until it swings to the largest angle 顺 clockwise. After that, start to counterclockwise to resume the swing. Repeatedly, the output shaft 2 drives the saw blade 5 to rotate and reciprocate to realize functions such as cutting and sawing. As can be seen from the above, the swing angle α of the output shaft 2 during the entire swing stroke is equal to 2 Θ.

Referring to FIG. 4 and FIG. 8 simultaneously, the eccentric transmission mechanism 4 of the multi-function machine 100 of the present embodiment can be switched between different working modes by the cooperation of the shift fork 6 and the driving member 7, and the output can be made in different working modes. Axis 2 outputs a different swing angle α. The multifunction machine 100 further includes an adjustment device 8 disposed on the eccentric shaft 31, which can drive the eccentric transmission mechanism 4 to switch between different operating modes.

The inner side walls 623 of the two mating portions 622 of the shift fork 6 are parallel and extend a distance in the horizontal direction. The adjusting device 8 includes a lever 81 and a push button 82 connected to the lever 81. The lever 81 is located at one side of the driving member 7 and includes a collar 83 sleeved on the eccentric shaft 31. The push button 82 is connected to The free end of the lever 81 is substantially perpendicular to the lever 81. The push button 82 is disposed outside the casing 1 and can be locked and locked in a plurality of different positions with the casing 1. When the push button 82 is manually pushed, the push button 82 drives the lever 81 to move.

As shown in FIG. 9, the eccentric shaft 31 includes a flange portion 311 and a section 312 and a second section 313 respectively located at two sides of the flange portion 311. The motor shaft 3 is axially opened at one end of the eccentric shaft 31 with an r-shaped receiving groove 32. . Both sides of the first segment 312 of the eccentric shaft 31 are cut away to form an r-square shape, and are slidably received in the receiving groove 32 of the motor shaft 3. The drive member 7 is mounted on the second section 313 of the eccentric shaft 31, and the collar 83 of the adjustment device 8 is located between the drive member 7 and the flange portion 311 of the eccentric shaft 31. The inner diameter of the collar 83 is much larger than the outer diameter of the second section 313. When the motor shaft 3 drives the eccentric shaft 31 to rotate, the second section 313 of the eccentric shaft 31 does not interfere with the collar 83 of the adjusting device 8.

Referring to FIG. 10 and FIG. 11, when the push button 82 of the push adjusting device 8 is moved to the left in the drawing, the push button 82 drives the push rod 81 to move leftward, and is driven by the collar 83 of the push rod 81. The right side of the member 7, thereby driving the driving member 7 and the eccentric shaft 31 to move to the left relative to the motor shaft 3. On the contrary, when the push button 82 of the push adjusting device 8 is moved to the right in the drawing, the push button 82 drives the push rod 81 to move rightward, and pushes the flange portion of the eccentric shaft 31 through the collar 83 of the push rod 81. The left side of 311, thereby driving the eccentric shaft 31 and the driving member 7 together Moves to the right relative to the motor shaft 3. Obviously, the movement of the driving member 7 causes the outer surface of the outer casing 7 1 to slide relative to the inner side wall 623 of the engaging portion 622 of the shifting fork 6, so that the shifting fork 6 and the driving member 7 can be engaged at a plurality of different positions, so that the eccentricity The transmission 4 has several different operating modes.

As shown in FIG. 10, the eccentric transmission mechanism 4 is in the first working mode. At this time, the driving member 7 is engaged with the right end of the engaging portion 622 of the shifting fork 6, and the horizontal distance of the driving member 7 to the axial center of the output shaft 2 is D1. At this time, the output shaft 2 has a swing angle α 1 . As shown in Fig. 11, the eccentric transmission mechanism 4 is in the second working mode, and the horizontal distance between the left end of the engaging portion 622 of the driving member 7 and the shifting fork 6 to the shaft of the output shaft 2 is D. 2. At this time, the output shaft 2 has a swing angle α2. Obviously, when the eccentric transmission mechanism 4 is moved by the adjusting device 8 from the first working mode to the second working mode, the horizontal distance of the driving member 7 to the axis of the output shaft 2 is gradually reduced from D 1 to D 2 , correspondingly The swing angle of the output shaft 2 is gradually increased from α 1 to α2.

It should be noted that the push button 82 of the adjusting device 8 and the casing 1 can be engaged and locked in a plurality of different positions, so that the working mode can be set between the first working mode and the second working mode to make the eccentric transmission mechanism 4 It is possible to switch between multiple operating modes so that output shaft 2 can optionally output a number of different swing angles a.

Next, a second embodiment of the present invention will be specifically described with reference to Figs. 1 2 to 1 .

The difference between this embodiment and the first embodiment is mainly the eccentric transmission mechanism, and the eccentric transmission mechanism in the present embodiment will be mainly described later. The oscillating power tool of the present invention includes a motor shaft 9 1 driven by a motor (not shown) and an output shaft 92 disposed perpendicularly to the motor shaft 9 1 and an eccentric transmission mechanism disposed between the motor shaft 9 1 and the output shaft 92. The eccentric drive shown in Figure 1 2 is in the first mode of operation, and the eccentric drive shown in Figure 13 is in the second mode of operation. The eccentric transmission of the present embodiment is selectively switchable between a first mode of operation and a second mode of operation, and the output shaft 92 outputs a different angle of oscillation when the eccentric transmission is in a different mode of operation. The oscillating power tool further includes an adjustment device 93 that drives the eccentric transmission to switch between the first mode of operation and the second mode of operation.

The eccentric transmission mechanism includes a shift fork 94 and a first drive member 95 and a second drive member 96 that are engageable with the shift fork 94, respectively. An eccentric shaft 97 is connected to the motor shaft 9 1 , and the axes of the motor shaft 9 1 and the eccentric shaft 97 are not overlapped and offset by a certain distance. The first driving member 95 and the second The driving member 96 is sleeved on the eccentric shaft 97, and the outer diameter of the first driving member 95 is smaller than the outer diameter of the second driving member 96. The shifting fork 94 is U-shaped and is provided with a first engaging portion 94 1 and a second engaging portion 942 which are respectively engageable with the first driving member 95 and the second driving member 96. The first mating portion 94 1 has two first inner sidewalls 943 disposed opposite to each other, and the second mating portion 942 has two second inner sidewalls 944 disposed opposite to each other. The spacing between the two first inner sidewalls 943 is smaller than the two second inner sides. The spacing between the walls 944.

The adjustment device 93 includes a push button 93 1 that can be manually pushed and a lever 932 that is perpendicular to the push button 93 1 . The push button 93 1 is disposed outside the casing (not shown), the lever 932 is connected to the push button 93 1 , and the other end has a collar 93 3 that is sleeved on the eccentric shaft 97. Push button 93 1 and case 1 can be matched and locked in several different working modes. When push button 93 1 is pushed, push button 93 1 will move lever 932 to move. One end of the eccentric shaft 97 extends axially into the motor shaft 9 1 and is axially slidable relative to the motor shaft 9 1 . By operating the push button 93 1 of the adjusting device 93, the driving lever 932 is reciprocated in the horizontal direction, thereby pushing the first driving member 95, the second driving member 96 and the eccentric shaft 97 to reciprocate axially relative to the motor shaft 9 1 . , thereby causing the eccentric transmission to switch between different operating modes.

As shown in FIG. 14 , the eccentric shaft 97 includes a flange portion 97 1 , a first segment 972 and a second segment 973 respectively located at two sides of the flange portion 97 1 , and a left side of the second segment 973 in the drawing. Third paragraph 974. The motor shaft 9 1 is axially opened at one end of the eccentric shaft 97 with a square receiving groove 9 1 1 , and both sides of the first segment 972 of the eccentric shaft 97 are cut away to form a square shape, and are slidably received in the motor shaft 3 The storage slot is 9 1 1 . The first driving member 95 is mounted on the third segment 974 of the eccentric shaft 97, and the second driving member 96 is mounted on the second segment 973 of the eccentric shaft 97, and there is a certain relationship between the first driving member 95 and the second driving member 96. interval. The collar 93 3 of the adjusting device 93 is located between the second driving member 96 and the flange portion 97 1 of the eccentric shaft 97, and the inner diameter of the collar 93 3 is much larger than the outer diameter of the second portion 973, when the motor shaft 9 1 is driven When the eccentric shaft 97 rotates, the second section 973 of the eccentric shaft 97 does not interfere with the collar 93 3 of the adjustment device 93.

Referring to FIG. 15, the eccentric transmission mechanism is driven by the adjusting device 93 in the first working mode. At this time, the two sides of the second driving member 96 are separated from the two second inner side walls 944 of the second engaging portion 942 of the shifting fork 94, and the first engaging portions 94 of the first driving member 95 and the first engaging portion 94 of the shifting fork 94 are separated. The two first inner side walls 943 of 1 are in close contact. The distance from the first drive member 95 to the axis of the output shaft 92 is D 3 , and the output shaft 92 has a first swing angle α 3 . Referring to FIG. 16, the eccentric transmission mechanism is switched from the first working mode to the second working mode under the driving of the adjusting device 93. At this time, the two sides of the first driving member 95 are separated from the two first inner side walls 943 of the first engaging portion 94 1 of the shifting fork 94, and the two sides of the second driving member 96 are secondly matched with the shifting fork 94. The two second inner side walls 944 of the portion 942 are in close contact with the axis of the second driving member 96 to the output shaft 92 by a distance D 4 , and the output shaft 92 has a second swing angle α4.

It can be understood that since the outer diameter of the first driving member 95 is smaller than the outer diameter of the second driving member 96, the distance D 3 of the first driving member 95 to the axial center of the output shaft 92 is smaller than the second driving member 96 to the output shaft. The distance of the axis of 92 is D 4 . Since the swing angle of the output shaft 92 is determined by the outer diameter dimension of the drive member and the distance from the axial center of the output shaft, the first swing angle α3 and the second swing angle α4 can be made unequal. Therefore, by operating the adjusting device 93, the eccentric transmission mechanism can be driven to switch between the first operating mode and the second operating mode, thereby causing the output shaft 92 to selectively output the first swing angle α 3 or the second swing angle 4 .

It should be noted that, in this embodiment, the first driving member 95, the second driving member 96 and the eccentric shaft 96 are slidably disposed relative to the motor shaft 9 1 , and may be implemented in other manners as follows: The eccentric shaft 96 can be opposite to the motor shaft 9 1 Fixed setting, and a sleeve slidable relative to the eccentric shaft 96 is disposed on the eccentric shaft 96, and the first driving member 95 and the second driving member 96 are mounted on the sleeve. By driving the adjustment device 93, the first driving member 95 and the second driving member 96 can be slid together with respect to the eccentric shaft 96. In addition, the eccentric transmission mechanism is not limited to switching between the two operating modes, and the conversion between more operating modes can be realized by increasing the number of driving members, so that the output shaft has more swing angles.

Compared with the prior art, the oscillating power tool of the present invention can drive the eccentric transmission mechanism to switch between different working modes through the adjusting device, so that the output shaft has different swinging angles, thereby meeting the requirements of different functional applications, so that The oscillating power tool has a larger field of application.

It can be understood that since the output shaft of the oscillating power tool of the present invention can output different swing angles, it can be set that the output shaft has at least one swing angle greater than 4° and can be set to be greater than 4. Any value, such as can be 5. 6, 6. , 7. , 8. , 9. Or 1 0. The species in the middle can also be greater than 10 °. By setting a larger swing angle, higher work efficiency can be achieved. Referring to the experimental data in the table below, the improvement of the efficiency of the oscillating power tool at a large swing angle is further explained. As can be seen from the table below, the output shaft 92 has a swing angle of seven. When using a precision saw blade to cut a white or medium density board of the same size, the efficiency is increased by more than 70% compared to a swing angle of 4°. When cutting a medium density board with a standard saw blade, the efficiency can be more oscillated. The angle is 4. Increase by 50%; in addition, when using double-broken saw blades to cut nails, the efficiency can be increased by 48%.

In the above embodiment, when the swing angle of the output shaft 92 is 7 °, the swing frequency of the output shaft 92 is 18,000 times per minute. It should be noted that, when the swinging angle of the output shaft is greater than 4 °, the swinging frequency of the output shaft is at least greater than that per minute.

10,000 times,

Further, the eccentric member in the present invention is not limited to the ball bearing in the above embodiment, and a needle bearing may be employed. In order to ensure that the eccentric member can carry a large load, the ratio of the outer diameter to the inner diameter of the bearing used in the eccentric member of the present invention is preferably 19/7 or 16/6 or other values greater than 19/7. By using bearings of the above dimensions, the eccentric can withstand higher loads and extend the life of the eccentric.

Compared with the prior art, the invention overcomes the technical prejudice that the swinging angle of the swinging power tool is set to ³ or less, and by setting a large swing angle greater than 4°, and simultaneously adopting a swing frequency greater than 10,000 times of the spear minute, the vibration frequency is greatly improved. The working efficiency of the oscillating power tool solves the technical problems that people have long been eager to solve.

Further, in the above embodiment, the power of the multi-function machine is 250 W, and the power of the swing power tool of the present invention may be other values. It is easy to understand that when the size of the oscillating power tool is large, if a higher working efficiency is to be obtained, the motor needs to have a larger output power. In the oscillating power tool of the present invention, the input power of the motor is greater than 500 W, so that the oscillating power tool has higher working efficiency. Accordingly, in order to facilitate the operation of large sizes The oscillating power tool can be mounted on the casing of the oscillating power tool to facilitate the grip of the operating handle. The operating handle can be arranged in a ring shape or a straight shape, and can be integrally formed with the casing, or can be detachably arranged separately from the casing.

By setting a larger (greater than 4°) output shaft swing angle, higher operating efficiency is achieved and debris is easily removed during saw blade operation. In addition, the large swing angle can be used with other types of accessory heads to extend the application of the oscillating power tool.

3匕, such as cutting grass, drilling, hammering, etc. Of course, a large swing angle will also have the other side effect, that is, the increase in vibration. While the conventional swing angle is smaller (less than 4.), the efficiency is relatively low, but the corresponding vibration is also small. Therefore, the user can select different swing angles to achieve different functions as needed. Therefore, in the oscillating power tool of the present invention, the output shaft can selectively output different swing angles according to the user, and the applicability of the oscillating power tool is greatly improved.

In order to further improve the working efficiency of the oscillating power tool in the embodiment of the present invention, the oscillating power tool has a steady speed control system for keeping the rotational speed of the motor constant.

Figure 17 shows a block diagram of the steady speed control system of the present invention. The steady speed control system includes a controller 12 and a power switch unit 13. The oscillating power tool further includes a power source 10 for supplying power thereto, and the motor 11 (i.e., the motor mentioned above) has a plurality of preset speeds n* which can be rotated at a specific preset speed n* depending on the selection.

The controller 12 monitors the working voltage Uc and the load current Ic at both ends of the operation of the motor 11, and calculates the target voltage Uo required for the motor 11 to reach the preset speed n* according to the load current Ic of the motor 11; and further based on the operating voltage Uc and The difference of the target voltage Uo adjusts the P WM duty ratio of the power source 10, and applies the PWM duty ratio to the power switch unit 13 to adjust the operating voltage Uc of the motor 11 to the target voltage Uo, thereby causing the motor 11 to be at the preset speed n * The next approximately constant rotation.

In the present embodiment, the power switch unit 13 includes a metal-oxide-semiconductor-field effect transistor MOSFET (referred to as a MOS transistor) 131 connected in series between the power source 10 and the motor 11, and the MO S transistor 131 is in an on-off state. Switch to change the pulse width of the P WM duty cycle.

Figure 18 is a detailed circuit diagram of the steady-speed control system of the present invention. The detailed operation of the control system of the multi-function machine 100 of the present invention will be further described in detail below with reference to Figures 11 and 12. The circuit includes a main switch 14 for controlling the opening and closing of the entire circuit. The motor 11 is a DC motor, and specifically may be a DC permanent magnet motor or a DC brushless motor. The power supply 10 is a rechargeable 10.8 仗 battery. The power supply 10 is connected to the input port VDD of the controller 12 via a buck circuit 15 to provide a stable 5 仗 power supply to the controller 12. The motor 11 and the MOS transistor 131 are connected in series with the power source 10 and the main switch 14.

A differential amplifying circuit 16 is connected in parallel with the motor 11 to detect the operating voltage Uc at both ends of the motor 11 during operation. The differential amplifying circuit 16 amplifies the detected operating voltage Uc across the motor 11, and then transmits the value of the operating voltage Uc to the controller 12 through the input port VDD.

A current sampling amplifying circuit 17 is connected in series between the motor 11 and the controller 12 for detecting the load current Ic when the motor 11 is operating. The current sampling amplifying circuit 17 amplifies the detected load current Ic when the motor 11 is operating, and then transmits the value of the load current Ic to the controller 12 through the input port AN6.

The power switch unit 13 further includes a MOSFET driver 132 connected to the MOS transistor 131 for regulating the on and off of the MOS transistor in accordance with the PWM duty ratio from the controller 12. The input of the MOSFET driver 132 is connected to the output port P WM of the controller 12, and the output terminal thereof is connected to the input terminal of the MOS transistor.

The principle of the power switch unit 13 adjusting the operating voltage Uc across the motor 11 will be described in detail below. First, the MOS transistor has a function of rapidly turning on and off according to the received PWM duty ratio. In the present embodiment, the controller 12 outputs the PWM duty cycle at a frequency of 2000 Hz, that is, the PWM duty cycle signal has a period of T = 0.5 milliseconds. The PWM duty cycle signal is amplified by MOSFET driver 132 from 5 仗 to 12 仗 to drive the MOSFET to turn on or off. During the period T, the pulse signal has a high level and a low level, and the ratio of the duration of the high level and the low level in the period T is the variable PWM duty ratio. Wherein, when the pulse signal is at a high level, the MO S tube is in an on state, and the voltage of the power source 10 can be applied to the motor 11 through the MO S tube; when the pulse signal is low, the MOS tube is in a closed state. At this time, the voltage of the power source 10 cannot be applied to the motor 11 through the MOS tube, but can pass through the freewheeling tube 111 at both ends of the motor 11. Thus, by adjusting the PWM duty ratio of the MOS transistor, the time during which the voltage of the power source 10 in the period T is effectively applied to the motor 11 can be adjusted, that is, the energy transmitted from the power source 10 to the motor 11 in the period T can be adjusted, thereby adjusting the motor 11 Working voltage Uc at both ends. Due to cycle T The duration is short and the motor 11 is always driven at an operator-perceivable time. The system also includes a battery voltage detection circuit 102 for detecting the battery voltage Ub of the power source 10 for protecting the power source 10 from over-discharging of the power source 10. The battery voltage detecting circuit 102 outputs the detected battery voltage Ub of the power source 10 to the controller 12 through the input port AN3. When the battery voltage Ub is lower than a predetermined value, the controller 12 turns off the entire system and cuts off the power supply 10 Power supply.

In order to protect the power source 10, the system further sets a battery temperature detecting circuit 101 to detect the battery temperature Tb across the power source 10, and inputs the battery temperature to the controller 12 through the input port AN7. When the battery temperature Tb exceeds a certain preset value, the controller 12 also disconnects the entire system and cuts off the power supply to the power supply 10.

The oscillating power tool usually needs to set different speeds for the user to select. Therefore, the steady speed control system is also provided with the gear position adjusting circuit 18. The controller 12 can control the speed adjustment circuit 18 via the output port AN4 so that the speed of the motor 11 can be switched between several different preset speeds n*.

The detailed process of adjusting the speed of the motor by the steady speed control system of the swing power tool of the present invention will be described below.

When the main switch 14 is turned on, the entire system circuit is controlled to be energized, the controller 12 is preset, the preset includes register initialization in the controller 12, and the timer reset adjustment. At this stage, the controller 12 reads the signal input from the speed setting section, and according to the user's selection to set a preset speed n*, the motor 11 starts to rotate at the preset speed n*.

At the same time, the differential amplifying circuit 16 transmits the detected operating voltage Uc of the motor 11 to the controller 12, and the current sampling amplifying circuit 17 transmits the detected load current Ic of the motor 11 to the controller 12. The controller 12 calculates the actual rotational speed n of the motor 11 at the preset rotational speed n* when the load current Ic is calculated by the preset rotational speed n* of the motor 11 and the load current Ic of the motor 11 monitored in real time according to the corresponding formula. The required target voltage Uo. The controller 12 adjusts the bandwidth ratio of the output P WM duty signal according to a corresponding algorithm, thereby controlling the on-time of the MOS transistor 131 through the MOSFET driver 132. When the MOS transistor 131 is turned on, both ends of the motor 11 are subjected to the voltage of the power source 10; when not conducting, the two ends of the motor 11 are not subjected to voltage, so by adjusting the bandwidth ratio of the PWM duty signal, The time ratio of the effective voltage applied to the motor 11 during a certain period of time can be adjusted, and the adjustment is applied to both ends of the motor 11 for a certain period of time in the macroscopic time. The operating voltage Uc, as well as the energy output by the power source 10, adjusts the actual speed n. When the operating voltage Uc of the motor 11 is higher than the target voltage Uo, the controller 12 adjusts the bandwidth ratio of the P WM duty ratio signal, the energy received by the motor 11 decreases, and the operating voltage Uc across the motor 11 decreases to be close to the target. The voltage Uo is such that the actual rotational speed n of the motor 11 is lowered to be close to the preset rotational speed n*. Vice versa, when the operating voltage Uc of the motor 11 is lower than the target voltage Uo, the controller 12 adjusts the bandwidth ratio of the P WM duty signal, the energy received by the motor 11 increases, and the operating voltage Uc across the motor 11 increases. Close to the target voltage Uo, the actual rotational speed n of the motor 11 is raised to be close to the preset rotational speed n*.

Specifically, the controller 12 compares the current operating voltage Uc of the motor 1 with the target voltage Uo to obtain a voltage deviation AU, and the controller 12 calculates the PWM duty cycle signal that should be outputted to the target voltage Uo according to the deviation AU. The PWM duty cycle signal is amplified by the MOSFET driver 132 and passed to the MOS transistor 131 to control the energy supplied to the motor 11 by the power source 10 for a specific time, so that the current operating voltage Uc of the motor 1 reaches the target voltage Uo.

In the present embodiment, the controller 12 calculates the pulse signal bandwidth ratio of the output to be a proportional-integral-derivative algorithm (referred to as the PID algorithm). The PID algorithm is an industrially common control algorithm. In the PID algorithm, this algorithm calculates the proportional, integral, differential response and the sum of the three to calculate the true output.

Further, this embodiment adopts an incremental PID algorithm. During the adjustment process, the processor 12 samples and calculates the working voltage Uc at both ends of the motor 11 every 50 milliseconds, and stores the processor 12 according to the current working voltage Uc1, the previous working voltage Uc2, and the previous working voltage Uc3. The proportional integral differential calculation is performed to obtain the output PWM duty cycle signal.

Specifically, the bandwidth ratio of the pulse width modulated signal can be calculated according to the following method:

First, the differential amplifying circuit 16 measures the operating voltage Uc of the motor 11, and outputs a signal to the controller 12.

Second, the controller 12 records the current working voltage Uc 1 of the motor 11, the previous working voltage Uc2, and the previous working voltage Uc3, and calculates their deviations.

Third, adjust the PWM duty cycle (PWM duty cycle) signal according to the deviation of the operating voltage Uc. The MOS transistor 131 adjusts the motor according to the received PWM duty signal: 11 The operating voltage Uc of the two reaches the target voltage Uo, so that the actual rotational speed n of the motor 11 is adjusted to be close to the preset rotational speed n*.

The control system of the multifunctional machine 100 of the present invention, by directly detecting the motor 11

The operating voltage Uc and the load current Ic, without setting a speed sensor to detect the rotational speed of the motor 11, can maintain the motor 11 of the multi-function machine 100 at an approximately constant preset speed n* structure, and the performance is relatively stable.

Further, as shown in Fig. 17, since the output shaft 2 of the multifunction machine 100 of the present invention can output different swing angles α, and the swing angle α of the output shaft 2 is different, the magnitude of the corresponding vibration is also different. Therefore, the multifunction machine 100 is provided with a speed governing device. When the swing angle α of the output shaft 2 changes, the speed control device can automatically change the swing frequency of the output shaft 2

The above-described speed governing device includes an angle sensor 99 connected to the controller 12 and the gear position adjusting circuit 18 and the controller 2 described above, and the angle sensor 99 will detect the output shaft

The swing angle α of 2 is transmitted to the controller 12, and when the swing angle α of the output shaft 2 is changed, the controller 2 automatically changes the preset rotational speed η* of the motor 11 through the gear position adjusting circuit 18. It is easy to understand that since no deceleration device is provided between the motor 11 and the output shaft 2, changing the preset rotation speed η* of the motor 11 changes the oscillation frequency of the output shaft 2 accordingly.

In the embodiment, the output shaft 2 of the multifunction machine 100 has a swing angle α 1 , α2, α3 which are sequentially increased, and the motor 11 has preset rotation speeds η 1 , η2, η3 which are sequentially increased. In the present embodiment, the swing angles α 1 , α2 , α3 are sequentially associated with the preset rotational speeds η 1 , η2, and η3. That is, when the swing angle α of the output shaft 2 is increased, the preset rotational speed η* of the motor 11 is correspondingly reduced, so that when the output shaft 2 is at a large swing angle α, the corresponding swing frequency is small, so that the output shaft 2 is made The vibration is relatively small, so that the multifunction machine 100 has a good operating feel. The specific working process of the speed governor is as follows: The angle sensor 99 monitors the swing angle of the output shaft 2 in real time and transmits it to the controller 12. When the controller 12 finds that the swing angle α of the output shaft changes from αΐ to α2 or α3, The bit adjustment circuit 18 adjusts the preset rotational speed η* of the motor 11 from n1 to n2 or n3.

The circuit elements of the system of the present invention are not limited to the specific forms recited in the above embodiments, and as will be readily appreciated by those skilled in the art, the selection of the specific forms of these elements is varied. For example, the controller 12 can also be an analog comparison circuit; The circuit detects the operating voltage Uc and the load current Ic at both ends of the motor 11; the power switch unit 13 can also use other types of field effect transistors other than the MOS transistor 131; the swing angle α of the output shaft 2 and the preset speed η of the motor 11 * It is not limited to three types. It is also possible to increase the preset rotation speed η* at the same time as the swing angle α is increased to have higher work efficiency.

When the multifunction machine 100 is in operation, the load on the saw blade 5 is usually not constant, but is constantly changing. By setting the steady speed control system, when the load of the saw blade 5 changes, the rotational speed of the motor 11 is not changed, but the rotational speed of the motor 11 is always kept relatively constant, so that the swing frequency of the output shaft 2 is relatively constant, thereby The saw blade 5 has a relatively constant oscillation frequency, thereby greatly improving the working efficiency of the multifunction machine 100.

Claims

The invention relates to an oscillating power tool comprising a casing, a motor disposed in the casing, an eccentric transmission mechanism driven by the motor, and an output shaft driven by the eccentric transmission mechanism and performing a rotary reciprocating oscillating motion about its own axis The oscillating power tool includes an adjustment device that can drive the eccentric transmission to switch between different operating modes such that the output shaft has different oscillating angles.

2. The oscillating power tool according to claim 1, wherein: the eccentric transmission mechanism includes a shift fork and a driving member connected to a motor shaft of the motor, and one end of the shift fork is connected to the output On the shaft, the other end of the shifting fork cooperates with the driving member, and the driving member can be matched with the different positions of the shifting fork by the adjusting device.

The oscillating power tool according to claim 2, wherein: the shifting fork has a fitting portion that cooperates with the driving member, the engaging portion extends in an axial direction of the motor shaft, and the adjusting device The driving member is slid along the axis of the motor shaft with respect to the engaging portion of the fork.

4. The oscillating power tool according to claim 1, wherein: said eccentric transmission mechanism comprises a shift fork and a first driving member and a second driving member spaced apart from each other on a motor shaft of said motor, said dialing The fork is provided with a first engaging portion and a second engaging portion respectively engageable with the first driving member and the second driving member, and the eccentric transmission mechanism has a first working mode and a second working mode, When the eccentric transmission mechanism is in the first working mode, the first driving member is matched with the first engaging portion of the shift fork; when the eccentric transmission mechanism is in the second working mode, the second driving member is The second mating portions of the shift forks cooperate.

The oscillating power tool according to claim 2 or 4, wherein: the motor shaft is connected with an eccentric shaft, the driving member is mounted on the eccentric shaft, and the eccentric shaft is opposite to the motor The shaft slides axially.

6. The oscillating power tool according to claim 1, wherein: said adjusting device comprises a push button and a lever connected to said push button, said push button driving said lever to drive said drive The piece moves relative to the shift fork.

7. The oscillating power tool according to claim 1, wherein: the oscillating power tool is provided with a speed adjusting device that adjusts a swing frequency of the output shaft when a swing angle of the output shaft changes, the adjusting The speed device includes a gear position adjusting circuit and a controller, and the controller adjusts the motor through the gear position adjusting circuit when a swing angle of the output shaft changes Rotating speed.

8. The oscillating power tool according to claim 1, wherein: said oscillating power tool comprises a power source, said motor has at least one preset rotational speed, and said oscillating power tool is provided with said motor in said pre-preparation a steady speed control system for constant rotation at a rotational speed, the steady speed control system comprising a controller and a power switch unit for connecting the power source and the motor, the controller monitoring an operating voltage and a load current of the motor And calculating a target voltage required to reach the preset speed according to the load current of the motor, adjusting an operating voltage of the motor to the target voltage, so that the motor rotates at a preset speed.

9. The oscillating power tool according to claim 8, wherein: the preset speed of the motor is more than 10,000 rpm.

1 0. An oscillating power tool comprising a casing, a motor disposed within the casing, an eccentric transmission mechanism driven by the motor, and an output shaft driven by the eccentric transmission mechanism and reciprocatingly swinging about its own axis, The eccentric transmission mechanism has at least two working modes, and the output shaft has different swing angles when the eccentric transmission mechanism is in different working modes.