JP3655481B2 - Vibration driver drill - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vibration driver drill capable of switching a plurality of operation modes.
[0002]
[Prior art]
As disclosed in Japanese Patent Laid-Open No. 6-339868, the structure for switching the operation mode of the vibration driver drill is fixed to the spindle and is provided with a ratchet tooth in the axial direction, and is loosely inserted into the spindle so as to face the rotation ratchet . Similarly, a structure is known in which cam means comprising a ratchet tooth formed on the surface to be fixed and fixed to be rotated is controlled by a first switching member such as a ring body or a lever. That is, at the first switching position of the first switching member, the fixed ratchet moves to the rotating ratchet side and the ratchet teeth interfere with each other, and the spindle is given a vibration motion in the axial direction in addition to the rotation (vibration mode). ) In the second switching position, the fixed ratchet is separated from the rotating ratchet, and only the rotation is applied to the spindle (drill mode).
Also, here, in the planetary gear speed reduction mechanism disposed in the front stage of the spindle, one of the internal gears meshed around the planetary gear is rotatable in the housing, and the internal gear is a steel ball. A torque adjusting mechanism is also employed that is fixed by pressing means including a washer and a coil spring, and rotates the internal gear idle to cut off the rotation transmission of the spindle when the load on the spindle increases. The torque can be set by changing the pressing force of the coil spring by rotating the second switching member such as a ring body that is screwed into the housing and supports the front end of the coil spring.
On the other hand, there is also described a configuration in which the switching of the cam means and the change of the pressing force of the coil spring can be performed with one switching member.
[0003]
[Problems to be solved by the invention]
By the way, when using in vibration mode or drill mode, in addition to the operation mode switching operation by the first switching member, the torque is generated by operating the second switching member so that the internal gear does not easily idle due to the load. Must be maximized. On the other hand, when using for vibration or drill mode from screw tightening, in addition to switching to drill mode with the first switching member, the second switching from the maximum torque to the desired torque is performed again so that torque adjustment works. The member needs to be manipulated again. As described above, when switching between vibration mode and drill mode and torque adjustment, the operation of the two switching members is always required, which makes the handling troublesome and unusable.
On the other hand, even when switching the operation mode and torque adjustment with a single switching member, the alternate use of drilling and screw tightening is to rotate the switching member (here the switching ring) alternately left and right by the maximum amount. As it was sometimes used, it was not easy to use.
[0004]
Therefore, the invention according to claim 1 uses two switching members for selecting the operation mode in this way, and in the case of the vibration mode and the drill mode, the operation of the second switching member is not required, and the selection of the operation mode is performed. The purpose of this invention is to provide a vibration driver drill that is easy to use and has excellent usability.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is provided with a restricting member capable of fixing the internal gear so as to be movable between a fixing position of the internal gear and a releasing position of the fixing. On the other hand, the first switching member is set with a third switching position for causing the spindle to rotate only, and the first switching position and the second switching position are set by the operation of the first switching member. The restricting member is controlled to move to the fixed position, and the restricting member is controlled to move to the release position at the third switching position.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<< Form 1 >>
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. Each is regulated by a second change ring 39 as a second switching member to be fitted.
[0010]
As shown in FIG. 3, two washers 40 and 41 are disposed between the first change ring 32 and the second change ring 39. 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. In the front washer 40, a pair of left and right spring pieces 44, 44 formed by elastically deforming a belt-like free end along the outer surface of the cylindrical portion 9a forward, and at the upper center are the same. A click piece 45 formed by elastically deforming the center of the belt-like free end along the outer surface of the cylindrical portion 9a is formed, and the rear washer 41 has a 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 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. The front end of the stopper 47 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. Forty spring pieces 44, 44 abut and urge the stoppers 47, 47 forward, to abut 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, when the vibration driver drill 1 is viewed from the front side, the bearing box 33 and the first switching position (FIG. 4A) in which the click piece 45 is fitted in the recess 59 at the left end of the first change ring 32. The three cams 19 rotate clockwise and the second protrusions 31 and the protrusions 27 overlap in the axial direction to push 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 first aspect, in addition to the coil spring 56 for adjusting the torque, the stoppers 47 and 47 for directly contacting the flat washer 50 and fixing the internal gear 13 are provided, while the first change ring 32 is provided. By setting the clutch mode (third switching position) and controlling the stoppers 47 between the vibration mode or the drill mode and the clutch mode by rotating the first change ring 32, the vibration mode and the drill are controlled. The release of the clutch required in the mode can be performed regardless of the torque adjustment position by the second change ring 39, and the clutch does not work in the vibration mode and the drill mode. Therefore, the three operation modes of the vibration mode, the drill mode, and the clutch mode (torque adjustment) can be easily and reliably switched only by the operation of the first change ring 32, which is excellent in usability.
[0017]
<< Form 2 >>
Next, another embodiment of the vibration driver drill will be described. In addition, since the same code | symbol as the said form 1 shows the same component, description is abbreviate | omitted.
5 and 6, a ring-shaped first cam 63 is fixed to the spindle 5 in the cylindrical portion 9a so as to be integrally rotatable between the ball bearings 15 and 16, and the first cam 63 has a first surface on the rear surface thereof. Cam teeth 64 are formed. Further, in front of the lock ring 65 that closes the cylindrical portion 9a behind the first cam 63, the second cam teeth 67, 67, which are loosely penetrated by the spindle 5 and mesh with the first cam teeth 64 on the front surface. And a second cam 66 formed with engaging teeth 68 formed on the outer periphery of the second cam tooth 67. 69, 69... Are steel balls provided between the second cam 66 and the spindle 5, and 70 is between the large diameter portion of the spindle 5 and the ball bearing 16 to urge the spindle 5 to the foremost position. The coil springs 71 and 71 are pins that fix the ball bearing 16 by penetrating the cylindrical portion 9a orthogonally.
[0018]
On the other hand, a pair of upper and lower cuts 72, 72 are formed in the axial direction at the front end of the cylindrical portion 9a, and a switching lever 73 is movably accommodated in each cut 72. The switching levers 73 and 73 are formed in a cylindrical shape through a notch 72 at a middle portion of a claw 74 capable of engaging with an engaging tooth 68 of the second cam 66 at a rear end extending along the inner periphery of the cylindrical portion 9a. A connecting piece 75 protruding in the radial direction of the portion 9a is formed. Here, a cam ring 76 is provided between the first change ring 32 and the washer 40, and the connecting pieces 75, 75 are inserted between the cam ring 76 and the first change ring 32. The cam ring 76 is integrated with the first change ring 32 by fitting the three protrusions 77, 77,... On the outer periphery with the three recesses 78, 78,. Thus, a step is formed on the front surface where the two arc portions 79, 79 positioned symmetrically with respect to the point are lowered, and the step on one side positioned symmetrically with respect to the arc portions 79, 79 becomes inclined surfaces 80, 80. Yes. Further, on the rear surface of the first change ring 32, in addition to the protrusions 49, 49 for retracting the stopper 47, it is located on the inner peripheral side of the arc portion 79 and has an inclined surface 80 with an interval through which the connecting piece 75 can pass. A pair of protrusions 81, 81 each having an inclined surface 82 that is parallel to each other is formed, and by rotating the first change ring 32, the connecting pieces 75, 75 are guided between the inclined surfaces 80, 82, and the protrusion The claws 74 and 74 can be engaged with and disengaged from the engaging teeth 68 of the second cam 66 by changing the axial positions of the switching levers 73 and 73 by moving relative to the riding position on 81 and the separating position from the protrusion 81. It is said.
[0019]
Therefore, in the second embodiment, when the vibration driver drill 1 is viewed from the front side, the first switching position (FIG. 7A) in which the click piece 45 fits into the concave portion 59 on the right end of the first change ring 32, The connecting pieces 75 and 75 are guided by the inclined surfaces 80 and 82 and ride on the protrusions 81 and 81, so that the switching levers 73 and 73 are retracted. Then, the rear end pawls 74, 74 engage with the engaging teeth 68 of the second cam 66 to restrict the rotation of the second cam 66, so that the first cam teeth of the first cam 63 that rotates integrally with the spindle 5. 64 interferes with the second cam teeth 67 of the second cam 66, and the vibration mode is such that the spindle 5 moves back and forth with rotation. Further, at the second switching position where the first change ring is rotated 30 ° rightward from there (FIG. 7B), the protrusions 81 and 81 move from the front of the connecting pieces 75 and 75, and the inclined surfaces 80 and 82 are moved. The connecting pieces 75 and 75 are moved forward by the guidance between them, and the switching levers 73 and 73 are advanced. Therefore, the second cam 66, which is unlocked by the claws 74, 74, is free to rotate, and the spindle 5 is in a drill mode in which only the rotation is performed. In the vibration mode and the drill mode, since the protrusions 49 and 49 press the stoppers 47 and 47 rearward to contact the flat washer 50, the three modes regardless of the torque setting by the second change ring 39. The internal gear 13 at the stage is firmly fixed.
Then, in the third switching position in which the first change ring 32 is rotated 30 ° to the right from the drill mode (FIG. 7C), the positions of the switching levers 73 and 73 remain unchanged, and the protrusions 49 and 49 is a clutch mode in which the torque of the spindle 5 is adjusted by a change in the pressing force of the coil spring 56 due to the operation of the second change ring 39 since the 49 is separated from the stoppers 47 and 47 to allow the flat washer 50 to move forward. It becomes.
[0020]
As described above, in the second embodiment, as in the first embodiment, the stoppers 47 and 47 for fixing the coil spring 3 for adjusting the torque are controlled by the rotation operation of the first change ring 32. In this case, the clutch can be released regardless of the torque adjustment position by the second change ring 39, and the clutch does not work in the vibration mode and the drill mode. Therefore, the three operation modes of the vibration mode, the drill mode, and the clutch mode can be easily and surely switched only by the operation of the first change ring 32, and the usability is excellent.
[0021]
The number and shape of the stoppers 47 as restricting members, and the number and shape of the corresponding protrusions 49 are not limited to those in the first and second embodiments. For example, the rotation of the internal gear 13 can be regulated and released by moving back and forth in the axial direction between the first and second switching positions of the first change ring 32 and the third switching position. If necessary, it can be changed as appropriate. In addition, the structure relating to torque adjustment may be one or two steel balls stacked in the axial direction instead of the pin 57, or by engagement of claws having inclined surfaces. It is not limited to the contents.
[0022]
【The invention's effect】
According to the first aspect of the present invention, in addition to the torque adjustment pressing means, a third switching member is provided, in which the regulating member capable of fixing the internal gear is provided, and the first switching member causes the spindle to rotate only. Torque adjustment required in the vibration mode and drill mode selected at the first and second switching positions by setting the position and controlling the movement of the restricting member by operating the first switching member The function can be released regardless of the torque adjustment position by the second switching member, and torque adjustment does not occur in the vibration mode and the drill mode. Therefore, the three operation modes of the vibration mode, the drill mode, and the torque adjustment can be easily and reliably switched only by the operation of the first switching member, which is excellent in usability.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional explanatory view of a vibration driver drill in form 1;
FIG. 2 is an exploded explanatory diagram showing a structure relating to switching of operation modes in the first embodiment.
3 is an exploded explanatory view showing a structure relating to torque adjustment in Embodiment 1. FIG.
FIG. 4A is an explanatory diagram showing a vibration mode in the first embodiment.
(B) It is explanatory drawing which shows the drill mode in the form 1. FIG.
(C) It is explanatory drawing which shows the clutch mode in the form 1. FIG.
FIG. 5 is a partial cross-sectional explanatory view of a vibration driver drill in form 2;
6 is an exploded explanatory view showing a structure relating to switching of operation modes in Embodiment 2. FIG.
FIG. 7A is an explanatory diagram showing a vibration mode in form 2;
(B) It is explanatory drawing which shows the drill mode in the form 2.
(C) It is explanatory drawing which shows the clutch mode in the form 2. FIG.
[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, 13 .... Internal gear, 17, 63 ... First cam, 18, 66 ... Second cam, 19 ... Third cam, 20, 64 ... First cam teeth, 21, 67 ··· second cam teeth, 32 · · first change ring, 39 · · second change ring, 40, 41 · · washer, 53 · · spring holder.

Claims (1)

A cam means capable of adding an oscillating motion in the axial direction in association with the spindle, and a first switching member for switching the linkage state of the cam means to the spindle are provided, and the first switching of the first switching member is provided. In the position, rotation and vibration can be imparted to the spindle, and in the second switching position, only rotation can be imparted to the spindle. On the other hand, an internal gear rotatably provided by a planetary gear reduction mechanism in front of the spindle; A pressing means for pressing the internal gear; and a second switching member capable of adjusting the pressing force of the pressing means. The operation of the second switching member causes the internal gear to idle and the spindle to rotate. A vibration driver drill that enables torque adjustment to block rotation transmission to
A restricting member capable of fixing the internal gear is provided so as to be movable between a fixing position of the internal gear and a releasing position of the fixing, while the first switching member is configured to cause the spindle to rotate only. Three switching positions are set, and the restriction member is set to the fixed position at the first switching position and the second switching position, and the restriction is set at the third switching position by operating the first switching member. A vibration driver drill characterized in that each member is controlled to move to the release position.

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