JP3164609U - Power mode switching device used for electric tools - Google Patents

Abstract

A power mode switching device for use in an electric tool is provided. A power mode switching device used for an electric tool includes a striking unit connected to a power unit, and the striking unit includes a washer ring 16, a switching ring 19, a spring 13, a striking base, and a main shaft 11. In the non-actuated state, the switching ring 19 is restricted, presses and locks the washer ring 16, and when the main shaft 11 is driven by the power unit and rotates, the striking base rotates in conjunction with it and is restricted to move in the axial direction. Can move. Thereby, the striking block 122 continuously interlocks and rotates the convex block of the output shaft, thus forming a power output mode in the electric drill mode, and when the dial is turned, the restriction on the axial direction of the striking block 122 is released. At this time, when the striking block 122 is interlocked with forward rotation or reversal, the striking block collides with the convex block of the output shaft and retreats in the axial direction. Return to work. [Selection] Figure 2

Description

  TECHNICAL FIELD The present invention relates to a power mode switching device used for a power tool, and more particularly to a power tool, which is a control device that is applied to a power tool and that continuously outputs power and switches intermittently while generating intermittent impact power. The present invention relates to a power mode conversion device used in the above.

In the conventional electric tool used for drilling and screw tightening, the structure is such that the power of the motor is transmitted to the output shaft via the gear system, thereby achieving a speed reduction function of deceleration or acceleration.
In addition, in order to tighten a screw more firmly or to remove a closed screw smoothly, some drilling and screwing electric tools have an impact function.
Thus, the screw is tightened more tightly at the moment of tightening the screw, or the screw is loosened at the moment of removing the screw to facilitate the removal.

Conventionally known power tool mechanisms with impact functions are motors, first planetary gear units, second planetary gear units, power units composed of clutch mechanisms, etc., and transmission shafts, intermediate shafts, striking bases, An output shaft is provided.
When the clutch disc in the clutch mechanism moves to the first position in the axial direction, the transmission shaft is connected to the second planetary gear unit, and the transmission shaft and the output shaft are engaged.
At this time, the motor continuously outputs power through the first planetary gear unit, the second planetary gear unit, the transmission shaft, and the output shaft, thereby rotating at a low speed, and can be used as an electric drill.
On the other hand, when the clutch disc is moved to the second position in the axial direction, the transmission shaft is simultaneously separated from the second planetary gear unit and the output shaft.
At this time, the motor outputs power through the first planetary gear unit, the second planetary gear unit, the transmission shaft, the intermediate shaft, the striking base, and the output shaft, and at the same time performs high-speed rotation and intermittent impact, thereby impact type Can be used as a driver.
However, there is a problem that the structure of the switching device used for rotation or impact output mode switching is complicated and the manufacturing cost is high.
This invention is made | formed in view of the fault mentioned above of the switching apparatus used for the conventional electric tool.

  The problem to be solved by the present invention is that the structure of the power mode conversion device of the conventional power tool is complicated and the manufacturing cost is to be output by continuously rotating and outputting the power, or outputting the power by the intermittent impact simultaneously with the rotation. It is an object of the present invention to provide a power mode conversion device used for an electric tool that can solve the problem of high cost.

In order to solve the above-mentioned problems, the present invention provides a power mode switching device used for the following electric tool.
The power mode conversion device used for electric tools has a simple structure and a striking unit connected to the power unit.
The striking unit includes a washer ring, a switching ring, a spring, a striking base, and a main shaft.
When the power unit is not in operation, the switching ring is restricted, presses and locks the washer ring, and when the main shaft is driven and rotated by the power unit, the striking base is interlocked and rotated, and is restricted. Thus, the striking block continuously rotates the convex block of the output shaft in conjunction with this, thereby forming a power output form of the electric drill mode, and turning the dial turns the striking block of the striking block. The restriction on the axial direction can be released. At this time, when the striking block is rotated forward or reversely, it collides with the convex block of the output shaft and retreats in the axial direction, and then uses a spring. Return the striking base to its original position,
By continuously circulating in this way, it is possible to produce a power output form of impact mode,
The striking unit includes a washer ring, a switching ring, a spring, a striking base, a main shaft, and a housing.
The washer ring is provided with a plurality of openings on the periphery,
At the first end and the second end of the switching ring, a plurality of first convex portions and a plurality of second convex portions that enter the notch of the washer ring are installed, respectively, on the outer diameter surface of the switching ring. Install an annular groove tank,
Both ends of the spring hold the washer ring and the switching ring,
The striking table has a board surface having an outer diameter larger than that of the striking board, and a plurality of striking blocks are installed on the board surface, the outer diameter of the board surface extends in the axial direction, and the first convex portion A plurality of concave tanks are installed, and a shaft hole is provided at the center of the striking table. An inner V-shaped groove tank is installed on the inner diameter of the shaft hole. The main shaft is the washer ring, Installed through the spring, the switching ring, and the striking table, and the main shaft can move relative to the axial direction after corresponding to the washer ring, but cannot rotate relative to the outer diameter of the main shaft. Is installed an outer V-shaped groove tank, a plurality of steel balls are placed between the outer V-shaped groove tank and the inner V-shaped groove tank, the main shaft and the striking table are connected by each steel ball, The power unit is connected by the main shaft,
The housing is provided with a plurality of slant tanks on one side wall, an output shaft having a plurality of convex blocks at one end and the striking unit are sequentially inserted into the housing, and at least one housing is further provided on one side wall. Installed in the dial where the tank hole of the dial is installed, a slide block is installed in the tank hole of the dial,
Thereby, the flange installed on the slide block corresponds to the oblique tank of the housing, and the pin concentric with the flange is inserted into the annular groove tank of the switching ring, and produces a limiting action,
One end of the main axis is preferably a polygonal axis having a polygonal cross section,
In the center of the washer ring, a polygonal hole corresponding to the polygonal axis and through which the polygonal axis can pass is provided.
As a result, the main shaft and the washer ring can be combined and moved in the axial direction relative to each other, but they do not rotate relative to each other.
The power unit preferably comprises an output plate,
The center of the output plate is inserted corresponding to the polygonal axis of the main axis, and with a corresponding polygonal hole,
Thus, the rotation of the main shaft is driven using the output plate,
The first convex portion and the second convex portion that are installed in the switching ring are preferably press-molded from the side wall of the switching ring to the center, and protrude from the inner wall of the switching ring.
Thereby, when the switching ring is fitted to the outside of the striking table, the first convex portion and the second convex portion enter correspondingly to the concave tank of the striking table and the opening of the washer ring, respectively.
With the mechanism described above, when the power unit is in an inoperative state, the switching ring is restricted by the slide block, and the second convex portion presses the opening of the washer ring,
When the main shaft is driven by the power unit and rotates, the power is transmitted to the output shaft through the striking table, the output shaft receives a load in the operating state, and the reaction force is transmitted to the striking table, and thus the striking table. Is inverted
In this state, the outer V-shaped groove tank and the inner V-shaped groove tank use a structure that interlocks with the steel ball, whereby the striking table is axially moved toward the washer ring when reversed. And after the reversal of the striking table, the concave tub on the outer edge and the first convex portion of the switching ring are displaced from each other,
Thus, in order to prevent the striking table from continuously moving in the axial direction, the striking block at the front end of the striking base cannot be separated from the convex block at the rear end of the output shaft,
As a result, power is continuously transmitted, and power is output in the form of an electric drill mode.
When setting the power output form in the intermittent rotation impact mode, the user turns the dial, whereby the slide block is restricted by the slant tank of the housing and moves in the first direction.
Thus, the switching ring is interlocked and moved in the first end direction, whereby the second convex portion at the second end of the switching ring disengages the opening of the washer ring and One convex part slides into the concave tank of the batting table,
At this time, regardless of whether the striking base is rotating forward or reverse, the switching ring rotates synchronously accordingly, but the switching ring is moved back and forth due to the restriction of the slide block. Therefore, when the striking base reverses due to the reaction force and moves in the second end direction, it is not subject to any restrictions.
Thereby, the striking block at the front end of the striking base smoothly disengages the convex block at the rear end of the output shaft, and the elasticity of the spring acts again on the striking base to return it,
In this way, it can circulate constantly and cause intermittent rotation and impact motion.

  The power mode conversion device used for the electric tool of the present invention continuously rotates to output power, or outputs power by intermittent impact at the same time as rotation, and the structure of the conventional power tool power mode conversion device is complicated. Thus, the problem of high manufacturing cost can be solved.

It is a three-dimensional exploded view showing the combination relationship of the main parts of the striking unit provided in the present invention. In this invention power mode change device, it is a solid sectional view showing the structure state of a hitting unit when there is no power to drive. FIG. 4 is an external plan view showing the structural state of the striking unit when there is no driving power in the power mode switching device of the present invention. In this motive power mode change device, it is a solid sectional view showing the structure state of a hitting unit at the time of electric drill mode output form. FIG. 3 is a three-dimensional cross-sectional view showing a structural state of a hitting unit when an impact mode is output in the power mode conversion device of the present invention. FIG. 3 is an external plan view showing a structural state of a striking unit in an impact mode output mode in the power mode switching device of the present invention. It is a three-dimensional exploded view showing a combination relationship of main parts after applying the striking unit provided in the present invention to a power tool.

  The best mode for carrying out the present invention will be described below in detail with reference to the drawings.

As shown in FIG. 1, the power mode switching device used in the inventive electric tool includes a striking unit 1.
The embodiment of the striking unit 1 includes a main shaft 11, a striking base 12, a spring 13, a washer 14, a thrust bearing 15, a washer ring 16, a fitting ring 17, a plurality of steel balls 18, and a switching ring 19.

The first end of the main shaft 11 is formed with an outer V-shaped grooved tank 111 on the outer diameter surface that has been stretched a certain distance in the axial direction, and the second end of the main shaft 11 is stretched a certain distance in the axial direction. The polygonal axis 112 having a polygonal cross section is formed.
A fitting annular groove 113 is formed on the outer diameter of the polygonal shaft 112.
In the embodiment of the hitting table 12, a board surface 124 having an outer diameter larger than that of the hitting table 12 is provided.
A plurality of protruding striking blocks 122 are installed on the board surface 124, and a plurality of concave tanks 123 extending in the axial direction are installed on the outer diameter of the board surface 124.
A shaft hole is provided in the center of the hitting table 12, and an inner V-shaped groove tank 121 is installed on the inner diameter of the shaft hole.

After putting the plurality of steel balls 18 into the outer V-shaped groove tank 111, when the main shaft 11 is passed through the shaft hole of the striking table 12, the steel balls 18 are separated from the outer V-shaped groove tank 111, the inner V-shaped groove tank 121, and Thus, the steel ball 18 becomes a traction component between the main shaft 11 and the striking table 12.
The washer ring 16 is a cylindrical body, and a plurality of notches 161 are provided on the periphery thereof.
A polygonal hole 162 corresponding to the end surface of the polygonal shaft 112 of the main shaft 11 is installed in the center of the washer ring 16.
The switching ring 19 is also a cylindrical body, and a plurality of first convex portions 191 and a plurality of second convex portions 191A are installed on the opposed first and second ends.

It is preferable that each first convex portion 191 and each second convex portion 191A adopt a press molding technique and project from the side wall of the switching ring 19 to the inner wall of the switching ring 19 in the center direction.
Moreover, the first convex portion 191 after molding slides into the concave tank 123 of the batting table 12 in the axial direction, and the second convex portion 191A slides into the cutout 161 of the washer ring 16.
An annular groove tank 192 is installed on the outer diameter wall surface of the switching ring 19.

The combination method of the batting unit 1 is as follows.
First, in order, the thrust bearing 15, the washer 14, and the spring 13 are installed in the washer ring 16, and then the washer ring 16 is further combined with the second end of the switching ring 19.
Subsequently, the main shaft already combined with the striking table 12 is passed from the first end of the switching ring 19 to the polygonal hole 162 of the washer ring 16, and the fitting ring 17 is used for fitting the polygonal shaft 112. It fits into the groove 113.
In this way, separation between the main shaft 11 and the washer ring 16 is prevented, and the both ends of the spring 13 thereby provide a pressing action to the washer ring 16 and the striking table 12, respectively.
Thus, the hitting unit 1 is configured.

As shown in FIG. 7 which is an embodiment in which the power mode conversion device of the present invention is applied to a power tool, the power mode conversion device of the present invention converts the power tool into a power output mode of a power drill mode that continuously rotates, Or it can change to the power output form of intermittent rotation and impact mode.
The power mode switching device includes a power unit 7, an impact unit 1, an output shaft 2, a housing 3, a dial 4, at least one slide block 5, and an outer cover 6.

The power unit 7 includes a motor 71 that installs a main driving gear 711.
At the front end of the motor 71, a fixed base 79 and a base body 73 are installed in order.
In the base body 73, a gear plate 72, an annular piece 78, a plurality of small springs 77, an annular body 76, a plurality of planetary gears 74, a bearing 731 and an output plate 75 are installed in this order.
Thereby, each planetary gear 74 meshes with the inner ring gear 721 and the main driving gear 711 of the gear plate 72 simultaneously.
The plurality of localization pins 761 installed on one side of the annular body 76 pass through the plurality of tanks 781 installed on the periphery of the annular piece 78 after being fitted to the small springs 77 and installed.
Thereby, the small spring 77 presses one side surface of the gear plate 72.
The output plate 75 is installed in the base 73 corresponding to the bearing 731 and can freely rotate.
The plurality of convex pins 751 installed on one side of the output plate 75 pass through the center holes of the planetary gears 74, and are thereby connected.
The batting unit 1 is combined with the polygonal hole 752 installed at the center of the output plate 75.

In the present invention, after the striking unit 1 and the output shaft 2 are combined together in the housing 3, the housing 3 is combined with the base 73 of the power unit 7.
Thereby, the striking unit 1 and the power unit 7 complete the mechanical connection.
Subsequently, the dial 4 is combined with the housing 3, and the outer cover 6 is combined outside the dial 4.

The batting unit 1 and the power unit 7 are combined by directly inserting the polygonal shaft 112 at the second end of the main shaft 11 into the polygonal hole 752 of the output plate 75.
As a result, the polygonal shaft 112 can move in the axial direction relative to the polygonal hole 752, but does not rotate relative to the polygonal hole 752.

The output shaft 2 and the striking unit 1 are combined in order in the housing 3, whereby the side of the convex block 21 at one end of the output shaft 2 and the striking block 122 of the striking unit 1 are in close contact.
Next, the housing 3 is combined in the dial 4, and each slide block 5 is combined in the tank hole 41 of the dial 4.
Accordingly, the flange 51 installed on the slide block 5 corresponds to the oblique tank 31 of the housing 3, and the pin 52 installed concentrically with the flange 51 is inserted into the annular groove tank 192 of the switching ring 19.

2 and 3 show the mechanism by which the present invention is composed.
As shown in the figure, in a state where the power unit 7 is not operated, the switching ring 19 is restricted by the slide block 5, and the second convex portion 191 </ b> A presses the opening 161 of the washer ring 16.
When the motor 71 is actuated, the main driving gear 711 interlocks the operation of the planetary gear 74 and simultaneously drives the rotation of the output plate 75.
The output plate 75 is interlocked with the rotation of the main shaft 11, and the main shaft 11 is interlocked with the rotation of the striking table 12 by the steel ball 18.
Further, the striking block 122 moves the convex block 21, thereby rotating the output shaft 2.

The output shaft 2 receives a load in the operating state, and transmits the reaction force to the striking table 12, so that the striking table 12 is reversed.
In this state, a structure in which the outer V-shaped groove tank 111 and the inner V-shaped groove tank 121 are interlocked with each other corresponding to the steel ball 18, whereby the batting table 12 is axially moved toward the washer ring 16 when reversed. In addition, after the hitting table 12 is reversed, the concave tub 123 at the outer edge and the first convex portion 191 of the switching ring 19 are displaced from each other (see FIG. 4).
In this way, the striking block 122 at the front end of the striking base 12 cannot be separated from the convex block 21 at the rear end of the output shaft 2 in order to prevent the striking base 12 from continuing to move in the axial direction.
Thereby, motive power is continuously transmitted and motive power is output in the form of an electric drill mode.

The user turns the dial 4 to set the power output form in the intermittent rotation impact mode.
Thereby, the slide block 5 receives the restriction | limiting of the slant tank 31 of the housing 3, and moves to a 1st direction.
Thus, the switching ring 19 is interlocked and moved in the first end direction, whereby the second convex portion 191A of the second end of the switching ring 19 disengages the cutout 161 of the washer ring 16, and the first end The first convex portion 191 slides into the concave tank 123 of the batting table 12 (see FIGS. 5 and 6).
At this time, regardless of whether the batting table 12 is rotating forward or reverse, the switching ring 19 rotates synchronously according to it, but the switching ring 19 is moved back and forth due to the restriction of the slide block 15. Never do.
Therefore, when the striking base 12 is reversed by receiving a reaction force and is moved in the second end direction, no limitation is imposed.
Thereby, the striking block 122 at the front end of the striking base 12 smoothly disengages the convex block 21 at the rear end of the output shaft 2, and the elasticity of the spring 13 acts on the striking base 12 again and returns.
In this way, it can circulate constantly and cause intermittent rotation and impact motion.

  The names and contents of the present invention described above are only used for explaining the technical contents of the present invention, and do not limit the present invention. Equivalent applications based on the spirit of the present invention, conversion of parts (structure), replacement, increase / decrease in quantity are all included in the protection scope of the present invention.

  The present invention has the novelty that is a requirement for utility model registration, has sufficient progress compared to similar products of the past, has high practicality, meets the needs of society, and has a very high industrial utility value. large.

1 striking unit 11 main shaft 111 outer V-shaped groove tank 112 polygonal shaft 113 fitting annular groove 12 striking table 121 inner V-shaped groove tank 122 striking block 123 concave tank 124 disk surface 13 spring 14 washer 15 thrust bearing 16 washer ring 161 missing Port 162 Polygonal hole 17 Fitting ring 18 Steel ball 19 Switching ring 191 First convex part 191A Second convex part 192 Annular groove tank 2 Output shaft 21 Convex block 3 Housing 31 Swash tank 4 Dial 41 Tank hole 5 Slide block 51 Flange 52 Pin 6 Outer cover 7 Power unit 71 Motor 711 Main drive gear 72 Gear plate 721 Inner ring gear 73 Base body 731 Bearing 74 Planetary gear 75 Output plate 751 Convex pin 752 Polygonal hole 76 Annular body 761 Localization pin 77 Small spring 78 Ring piece 781 Missing tank 79 Fixing base

Claims (4)

It has a striking unit connected to the power unit,
The hitting unit includes a washer ring, a switching ring, a spring, a hitting table, a main shaft, an output shaft, a housing, a dial, and a plurality of slide blocks.
The washer ring is provided with a plurality of openings on the periphery,
At the first end and the second end of the switching ring, a plurality of first protrusions and a plurality of second protrusions that enter the notch of the washer ring are installed, respectively, on the outer diameter surface of the switching ring. Install an annular groove tank,
Both ends of the spring hold the washer ring and the switching ring,
The striking table has a board surface having an outer diameter larger than that of the striking board, and a plurality of striking blocks are installed on the board surface, the outer diameter of the board surface is extended in the axial direction, and the first convex portion A plurality of concave tanks are installed, and a shaft hole is provided at the center of the striking table, and an inner V-shaped groove tank is installed on the inner diameter of the shaft hole.
The main shaft is installed through the washer ring, the spring, the switching ring, and the striking table, and the main shaft can move in the axial direction relative to the washer ring, but can rotate relative to the main shaft. However, an outer V-shaped groove tank is installed on the outer diameter of the main shaft, and a plurality of steel balls are placed between the outer V-shaped groove tank and the inner V-shaped groove tank. The main shaft and the striking table are connected, the power unit is connected by the main shaft,
The output shaft corresponds to the striking unit in the axial direction, and one end of the output shaft is provided with a plurality of convex blocks that strike corresponding to the striking block,
The housing can install the striking unit and the output shaft in the internal space, and a wall of the housing is provided with a slant tank,
The dial can be installed in the interior space of the housing, the wall surface of the dial is provided with a plurality of tank holes,
The plurality of slide blocks include concentrically projecting flanges and pins, and the slide blocks are combined with the tank holes of the dial, whereby the flanges correspond to the oblique tanks of the housing, and the pins are A power mode switching device used for an electric tool, wherein the power mode switching device is inserted into an annular groove tank of a switching ring. One end of the main shaft is a polygonal shaft having a polygonal cross section,
The power used for the electric tool according to claim 1, wherein the washer ring has a polygonal hole at the center of the washer ring that corresponds to the polygonal axis and through which the polygonal axis can pass. Mode conversion device. The power unit includes an output plate,
The power mode switching device used for the electric power tool according to claim 1, wherein a center of the output plate is inserted corresponding to a polygonal shaft of the main shaft and is a corresponding polygonal hole.   2. The electric motor according to claim 1, wherein the first convex portion and the second convex portion installed on the switching ring are press-molded from a side wall of the switching ring to a center and project on an inner wall of the switching ring. Power mode change device used for tools.

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