JP3656887B2 - Vibration driver drill - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vibration driver drill provided with two switching members for switching an operation mode and for adjusting a torque.
[0002]
[Prior art]
In the vibration driver drill, switching between operation modes such as a vibration mode and a drill mode and torque adjustment are performed using separate switching members. For example, in the registered utility model publication No. 3004054, FIG. 8 and FIG. 9 adjust the torque of the spindle and the dial type first switching member for switching the operation mode between the vibration mode and the drill mode in front of the housing. There is disclosed a vibration driver drill in which a dial-type second switching member is provided on the front and rear in the axial direction, and an operation mode and a torque can be selected by rotating the switching members.
[0003]
[Problems to be solved by the invention]
By the way, in the case where the switching member is provided as described above, a click mechanism using a leaf spring, a ball or the like is provided in order to obtain positioning at a predetermined rotation position and improve operability. However, in order to display the mark of the rotation position between the switching members, the switching members are separated from each other, or the number of clicks between the first switching member and the second switching member is different (in the above publication, the first switching member is different). In many cases, the click mechanism is separately provided before and after the two switching members. Therefore, the structure is complicated and the cost is high, and there is a problem that the space related to the click mechanism becomes large and the vibration driver drill becomes long in the axial direction.
[0004]
Therefore, even if the invention according to claim 1 uses two switching members for the selection of the operation mode in this way, the click mechanism is reasonably arranged to simplify the structure and reduce the cost. The object is to provide a vibration driver drill that can save space.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, according to a first aspect of the present invention, there is provided a gear case accommodating a planetary gear speed reduction mechanism, wherein the switching members are interposed between the first switching member and the second switching member. A plate-like click body that can be positioned at the rotational position is externally fitted in a non- rotating state .
In addition to the object of claim 1, the invention according to claim 2 is a click piece that elastically urges the click body toward each switching member in order to enable easy formation of the click body. Is formed as a washer provided in a non-rotatable manner. On the other hand, each switching member is formed with a recess into which the click piece can be fitted at a predetermined rotational position.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a partial cross-sectional explanatory view of the tip portion of a vibration driver drill. A vibration driver drill 1 accommodates a motor 3 in a main body housing 2 composed of a pair of half housings, and from a motor shaft 4 of the motor 3, It transmits the rotation to the spindle 5 protruding forward from the gear assembly 7 through the gear assembly 7 assembled to the main body housing 2 from the front (right side in FIG. 1). A drill chuck 6 is provided at the tip of the spindle 5. ing. In the gear assembly 7, the first gear case 8 includes a plurality of planetary gears 11, 11, carriers 12, 12... Supporting the planetary gears 11, 11, and planetary gears 11, 11. A known planetary gear speed reduction mechanism 10 having three stages of internal gears 13, 13... Meshing on the outer periphery of the motor shaft 4 is accommodated, and the rotation of the motor shaft 4 is reduced. The spindle 5 is splined at its rear end to a hand-clamping lock cam 14 integrated with the third-stage carrier 12, and ball bearings 15, 16 are attached to a second gear case 9 fixed to the front of the first gear case 8. It is pivotally supported by.
[0007]
2, the first cam 17, the second cam 18, and the third cam 19 are respectively attached to the spindle 5 between the ball bearings 15 and 16 in the cylindrical portion 9a of the second gear case 9 from the front. It is penetrated and arranged coaxially. The first cam 17 is a ring body that rotates integrally with the spindle 5 and is formed with a plurality of first cam teeth 20, 20,. The second cam teeth 21, 21,... Having the same shape are formed on the front surface facing the teeth 20 and are freely inserted into the spindle 5. Further, the second cam 18 is provided with guide portions 22 and 22 protruding in two upper and lower portions, and these are inserted between a pair of ribs 23 and 23 and 24 and 24 formed in the axial direction on the inner surface of the second gear case 9. As a result, it can move only in the axial direction, and is urged rearward by a coil spring 26 disposed between the flat washer 25 on the rear surface of the ball bearing 16. Further, the rear surface of the second cam 18 is provided with three protrusions 27, 27,... That have an inclined surface on one side in the circumferential direction (counterclockwise toward the third cam 19).
[0008]
The third cam 19 is also a ring body which is on the bottom surface of the cylindrical portion 9a and is loosely inserted into the spindle 5. From the left and right side surfaces to the front, connecting arms 28 and 28 project along the inner surface of the cylindrical portion 9a. Has been. Further, on the rear surface of the third cam 19, a positioning restriction piece 30 to be inserted into the fan-shaped notch 29 connected to the through hole of the spindle 5 on the bottom surface of the cylindrical portion 9 a is projected. The third cam 19 is rotatable within a range in which can move in the circumferential direction. Further, on the front surface of the third cam 19, the second protrusions 31, 31,... Having an inclined surface in the circumferential direction opposite to the protrusion 27 of the second cam 18 are equally projected at three places. Here, when the third cam 19 is rotated in the direction of the inclined surface of the second protrusion 31, each of the protrusions 27 of the second cam 18 rides on each of the second protrusions 31 due to the guidance of the inclined surfaces. The cam 18 moves forward against the bias of the coil spring 26. In this riding state, the second cam teeth 21 on the front surface of the second cam 18 come into contact with the first cam teeth 20 on the rear surface of the first cam 17.
[0009]
On the other hand, the rotation of the third cam 19 is performed by a first change ring 32 as a first switching member that is rotatably fitted to the front end of the tubular portion 9a. That is, a cylindrical bearing box 33 for holding the ball bearing 16 is rotatably disposed between the spindle 5 and the cylindrical portion 9a, and the third cam 19 is formed in the notches 34, 34 at the rear ends. Are connected to each other, and a pair of connecting pieces 35, 35 projecting from the side surface of the bearing box 33 pass through the tubular portion 9 a to hold the grip portion 36 on the rear surface of the first change ring 32. 36, the bearing box 33 is rotated by the rotation operation of the first change ring 32, and the third cam 19 is synchronized. The first change ring 32 is moved forward by a flat washer 37 and a circlip 38 attached to the cylindrical portion 9a, and the rearward movement is also freely rotated by the cylindrical portion 9a. The second change ring 39 as a second switching member that is fitted and adjacent to each other is regulated.
[0010]
Also, as shown in FIG. 3, between the first change ring 32 and the second change ring 39, two washers 40, 41 as click bodies are arranged so as to overlap in the axial direction. These washers 40, 41 have protrusions 43, 43,... That are fitted between a plurality of protrusions 42, 42 protruding in the axial direction on the side surface of the cylindrical portion 9a, and are prevented from rotating on the cylindrical portion 9a. The front washer 40 has a pair of left and right spring pieces 44, 44 formed by elastically deforming a belt-shaped free end along the outer peripheral surface of the cylindrical portion 9a, and an upper center. Similarly, a click piece 45 is formed by elastically deforming the center of the belt-like free end along the outer surface of the cylindrical portion 9a, and the rear washer 41 is formed on the left side toward the second change ring 39. A click piece 46 is formed by elastically deforming the center of the belt-shaped free end along the outer peripheral surface of the cylindrical portion 9a backward.
[0011]
47 and 47 are a pair of stoppers that are curved along the left and right side surfaces of the cylindrical portion 9a and are slidable back and forth between the ridges 42 and 42 of the cylindrical portion 9a. Is a contact piece 48 that passes through the two washers 40 and 41 and rises perpendicularly to the axial direction on the rear surface of the first change ring 32, and a spring piece of the washer 40 is provided on the contact pieces 48 and 48. 44 and 44 come into contact with each other to urge the stoppers 47 and 47 forward and come into contact with the rear surface of the first change ring 32. On the other hand, on the rear surface of the first change ring 32, projections 49, 49 having one circumferential surface (clockwise in the rearward direction) as an inclined surface project in a point-symmetric manner. The axial positions of the stoppers 47 and 47 can be adjusted by moving the stoppers 47 and 47 on or away from the protrusions 49 and 49 in accordance with the moving operation. A flat washer 50 extending in the axial direction is provided at the base of the cylindrical portion 9a on the rear side of the stoppers 47, 47, with pressing pieces 51, 51 extending between the protrusions 42, 42 on the left and right sides of the cylindrical portion 9a. In a state where the stoppers 47, 47 are mounted on the protrusions 49, 49 as the first change ring 32 rotates, the rear ends of the stoppers 47, 47 come into contact with the flat washer 50.
[0012]
On the other hand, a female threaded portion 52 is formed on the inner periphery of the second change ring 39, and projections 54, 54,... The spring holder 53, which is externally fitted only movably and formed with a male thread portion 55 on the outer periphery, is screwed together, and the spring holder 53 is screwed in the axial direction by the turning operation of the second change ring 39. 50, the axial length of the coil spring 56 disposed between them, that is, the pressing force to the flat washer 50 can be changed. Further, behind the flat washer 50, there are disposed a plurality of pins 57, 57,... That pass through the second gear case 9 and come into contact with the front surface of the third internal gear 13 of the planetary gear speed reduction mechanism 10. The internal gear 13 is rotatably provided in the first gear case 8, and the internal gear 13 is applied by the pressing force of the coil spring 56 transmitted from the flat washer 50 through the pins 57, 57. Is supposed to be fixed.
[0013]
Further, a plurality of recesses 58, 58,... In which the click pieces 46 of the washer 41 can be fitted are arranged in the circumferential direction on the front surface of the second change ring 39, and the pressing force by the coil spring 56 is minimized to maximized. In the rotation range of the second change ring 39, the click piece 46 is fitted into any one of the recesses 58, and the click action for positioning the second change ring 39 is obtained. Similarly, on the rear surface of the first change ring 32, three recesses 59 into which the click pieces 45 of the washer 40 are fitted are formed at intervals of 30 ° so that a click action can be obtained at each position. Here, in the first switching position (FIG. 4 (A)) where the click piece 45 is fitted in the recess 59 at the left end of the first change ring 32 when viewing the vibration driver drill 1 from the front side, the bearing box 33 and The third cam 19 rotates clockwise and the second protrusion 31 and the protrusion 27 overlap in the axial direction, and pushes up the second cam 18 forward. Therefore, the second cam 18 and the first cam 17 are in a vibration mode in which the first and second cam teeth 20 and 21 come into contact with each other. When the spindle 5 rotates, the spindle 5 slightly moves in the axial direction due to the interference between the cam teeth. A seismic motion that moves back and forth will be given. 1 and 4, a wave washer 60 is mounted on the spindle 5 between the ball bearing 16 and the large diameter portion of the spindle 5, and a circlip in which the spindle 5 in the vibration mode is mounted on the rear end. The elasticity of 61 is returned to the foremost position in contact with the ball bearing 15.
[0014]
Next, at the second switching position in which the first change ring 32 is rotated 30 ° counterclockwise from the vibration mode (FIG. 4B), the second protrusion 31 of the third cam 19 and the second cam 18 are simultaneously rotated counterclockwise. Since the protrusions 27 are separated from each other in the circumferential direction and the second cam 18 is retracted, the drill mode in which the interference between the cam teeth with the first cam 17 is released. Therefore, here, the spindle 5 is operated only for rotation.
Further, in the case of this drill mode and the previous vibration mode, as shown in FIGS. 4A and 4B, the protrusions 49, 49 are in front of the stoppers 47, 47 and the contact pieces 48, 48 are moved backward. And the rear end of each stopper 47 is brought into contact with the flat washer 50. Therefore, in these operation modes, the forward movement of the pin 57 and the flat washer 50 is prevented regardless of the pressing force of the coil spring 56 due to the rotation of the second change ring 39. 13 is firmly fixed.
[0015]
Then, in the third switching position in which the first change ring 32 is rotated 30 ° counterclockwise from the drill mode (FIG. 4C), the second protrusion 31 of the third cam 19 and the protrusion 27 of the second cam 18 are separated. In this state, the protrusions 49 and 49 of the first change ring 32 are separated from the contact pieces 48 and 48 of the stoppers 47 and 47, and the stoppers 47 and 47 are advanced by the urging of the spring pieces 44 and 44, so The clutch mode is released to release the pressure. In this clutch mode, the internal gear 13 is fixed only by the pressing force of the coil spring 56 via the flat washer 50 and the pin 57, so that the load on the spindle 5 is increased at the end of tightening of the screw and the coil spring. When the pressing force of the internal gear 13 by 56 is exceeded, the pin 57 and the flat washer 50 are pushed up so that the internal gear 13 idles and the rotation transmission to the spindle 5 is interrupted. Therefore, when adjusting the torque at which such a clutch operates, the second change ring 39 is rotated to a desired position (the number indicating the torque strength is stepwise on the side surface of the second change ring 39). The arrow 62 that matches the number is projected on the side surface of the second gear case 9), and the pressing force of the coil spring 56 may be changed.
[0016]
As described above, according to the above embodiment, the first change ring 32 and the second change ring 39 are adjacent to each other in the axial direction, and the washers 40 and 41 as the click bodies are accommodated between the both change rings. Of course, the click action of the switching position by change ring can be obtained, and since the two click mechanisms can be combined in one place in a small space, the structure can be simplified and the assembly can be facilitated and the cost can be reduced. Become. Further, the vibration driver drill 1 does not become longer in the axial direction. In particular, the click body can be easily configured in a smaller space by forming the click pieces 45 and 46 on the washers 40 and 41 respectively and fitting them with the recesses 58 and 59 on the change ring side.
[0017]
In the above embodiment, since it is necessary to provide the spring pieces 44, 44 for urging the stoppers 47, the washer 40 for the first change ring 32 and the washer 41 for the second change ring 39 are provided. If the stoppers 47, 47 are not used, or another urging means is provided, the click pieces 45 and 46 may be formed together by using one washer as the click body. According to this, it is possible to further simplify the structure and reduce the cost.
In addition, a predetermined click is provided with a click body provided between the switching members, such as providing a plurality of click pieces facing each change ring, or reversely arranging the first change ring 32 and the second change ring 39. The design can be changed as appropriate as long as the action can be obtained.
[0018]
【The invention's effect】
According to the first aspect of the present invention, the gear member that accommodates the planetary gear speed reduction mechanism is interposed between the first switching member and the second switching member and positions each switching member at a predetermined rotational position. By fitting the possible plate-shaped click body in a non-rotating state, the click action of the switching position by each switching member can be obtained, of course, because the space related to the click mechanism can be gathered in one place, The simplification of the structure and the ease of assembly make it possible to reduce the cost. Further, the vibration driver drill does not become long in the axial direction.
According to the second aspect of the present invention, in addition to the effect of the first aspect, the click body is provided with a click piece that is elastically biased toward each switching member, and is provided in a non-rotatable manner. On the other hand, the click body can be easily configured in a smaller space by forming the recesses into which the click pieces can be fitted at the predetermined rotation positions on the respective switching members.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional explanatory view of a vibration driver drill.
FIG. 2 is an exploded explanatory view showing a structure related to switching of operation modes.
FIG. 3 is an exploded explanatory view showing a structure relating to torque adjustment.
FIG. 4A is an explanatory diagram showing a vibration mode.
(B) It is explanatory drawing which shows drill mode.
(C) It is explanatory drawing which shows a clutch mode.
[Explanation of symbols]
1 .... vibration driver drill, 2 .... body housing, 3 .... motor, 5 .... spindle, 7 .... gear assembly, 8 .... first gear case, 9 .... second gear case, 9a ..., cylindrical part, 10 .... Planetary gear reduction mechanism, 32 ... First change ring, 39 ... Second change ring, 40, 41 ... Washer, 44 ... Spring piece, 45, 46 ... Click piece, 58, 59 ... Recess.

Claims (2)

A first switching member capable of switching at least two operation modes of a vibration mode for imparting a vibration to the spindle and a drill mode for imparting only a rotation to the spindle by a turning operation on a gear case that houses the planetary gear reduction mechanism ; , A vibration driver drill with a second switching member capable of adjusting the torque by a rotating operation and being externally adjacent to the axial direction ,
A plate-like click body interposed between the first switching member and the second switching member and capable of positioning each switching member at a predetermined rotational position is externally fitted to the gear case in a non-rotating state. A vibration driver drill characterized by The click body is a washer that is formed in a non-rotatable manner by forming a click piece that is elastically biased toward each switching member side, while the click piece is placed at a predetermined rotation position on each switching member. The vibration driver drill according to claim 1, wherein a recess capable of fitting is formed.

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