JP2000233306A - Vibration driver drill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify an switching operation of an acting mode. SOLUTION: A stoppers 47, 47 which can axially move back and forth is provided on the outer circumference of a cylindrical part 9a supporting a spindle 5. When a first change ring 32 for switching operation modes rotates, the stopper 47 is axially moved back and forth according to movement of a projection 49 formed on the first change ring 32. In a vibration mode and a drill mode, the stopper 47 controls forward movement of a flat washer 50 for fixing an internal gear 13 while keeping contact with the flat washer 50. In a clutch mode provided for the first change ring 32 as a third switching position, the stopper 47 is separated from the flat washer 50.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration driver drill capable of switching a plurality of operation modes.

[0002]

2. Description of the Related Art A structure for switching the operation mode of a vibration driver drill is disclosed in Japanese Patent Application Laid-Open No. 6-339868, in which a rotary ratchet provided with ratchet teeth in the axial direction and loosely inserted into the spindle. There is known a structure in which a ratchet tooth is formed on a surface facing the fixed ratchet, and a cam means including a fixed ratchet which is prevented from rotating 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 rotation is given to the spindle (drill mode). Also, here, in a planetary gear reduction mechanism arranged in the preceding stage of the spindle, one of the internal gears meshing around the planetary gear is rotatable in the housing, and the internal gear is connected to a steel ball. There is also employed a torque adjustment mechanism that is pressed and fixed by a pressing means including a washer and a coil spring, and when the load on the spindle increases, the internal gear idles to interrupt the rotation transmission of the spindle. This torque can be set by changing the pressing force of the coil spring by rotating a second switching member such as a ring body that is screwed to the housing and supports the front end of the coil spring. On the other hand, a configuration in which the switching of the cam means and the pressing force of the coil spring can be changed by one switching member is also described.

[0003]

By the way, when the internal gear is used in the vibration mode or the drill mode, in addition to the operation of switching the operation mode by the first switching member, it is necessary to prevent the internal gear from easily slipping due to the load. It is necessary to operate the two switching members to maximize the torque. Conversely, when using from vibration or drill mode to screw tightening, etc., in addition to switching operation to drill mode by the first switching member, second switching from maximum torque to desired torque so that torque adjustment works. It is necessary to operate the member again. As described above, the operation of switching between the vibration and drill mode and the torque adjustment always requires the operation of two switching members, so that the handling is troublesome and the usability is not good. On the other hand, even when the operation mode is switched and the torque is adjusted by one switching member, the switching member (here, the switching ring) is alternately rotated left and right by the maximum amount in the alternate use of drilling and screw tightening. After all, it was not easy to use.

Therefore, the first aspect of the present invention uses two switching members to select an operation mode as described above. In the case of the vibration mode and the drill mode, the operation of the second switching member is unnecessary, and the operation is performed. An object of the present invention is to provide a vibration driver drill which is excellent in operability associated with mode selection and is excellent in usability.

[0005]

In order to achieve the above object, according to the first aspect of the present invention, a regulating member capable of fixing the internal gear includes a fixing position of the internal gear and a release of the fixing. While the first switching member is provided so as to be movable between the first switching member and the first switching member, a third switching position for causing the spindle to rotate only is set, and the first switching member is operated to operate the first switching position. The second switching position is controlled to move the regulating member to the fixed position, and the third switching position is controlled to move the regulating member to the release position.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. << Form 1 >> FIG. 1 is a partial cross-sectional explanatory view of a tip portion of a vibration driver drill. The vibration driver drill 1 accommodates a motor 3 in a main body housing 2 composed of a pair of half housings. From the shaft 4, the body housing 2
Rotation is transmitted to a spindle 5 projecting forward from the gear assembly 7 via a gear assembly 7 assembled from the front (right side in FIG. 1). A drill chuck 6 is provided at the tip of the spindle 5. In the gear assembly 7, a plurality of planet gears 11, 11,... And the planet gears 11, 11,.
And the internal gear 1 meshing with the outer periphery of the planetary gears 11, 11,.
Are accommodated, and the rotation of the motor shaft 4 is reduced.
The spindle 5 has a rear end spline-coupled to a hand-tight lock cam 14 integrated with the third-stage carrier 12, and ball bearings 15, 16 attached to a second gear case 9 fixed in front of the first gear case 8. Is supported by

As shown in FIG. 2, the second gear case 9
Between the ball bearings 15 and 16 in the cylindrical portion 9a of
From the front, a first cam 17, a second cam 18, and a third cam 19 are respectively penetrated through the spindle 5 and arranged coaxially. The first cam 17 is a ring body that rotates integrally with the spindle 5 and has a plurality of circularly continuous first cam teeth 20, 20... Formed on the rear surface. Second cam teeth 21 and 21 having the same shape on the front surface facing the teeth 20
Is a ring body that is formed and is loosely inserted into the spindle 5. Further, the second cam 18 has two guide portions 22 at the top and bottom.
22, a pair of ribs 23, 23 and 24, 24 formed in the inner surface of the second gear case 9 in the axial direction.
By being inserted between the ball bearings 16, they can be moved only in the axial direction, and are urged rearward by a coil spring 26 disposed between the ball bearing 16 and a flat washer 25 on the rear surface. On the rear surface of the second cam 18, one surface in the circumferential direction (counterclockwise toward the third cam 19) is provided.
Are equally projected at three locations.

[0008] The third cam 19 is also a ring body which is provided on the bottom surface of the cylindrical portion 9a and is loosely inserted into the spindle 5. From the left and right side surfaces thereof, the connecting arms 28, 28 extend along the inner surface of the cylindrical portion 9a.
28 are protruded. Also, on the rear surface of the third cam 19,
Positioning regulating piece 3 to be inserted into fan-shaped notch 29 connected to the through hole of spindle 5 on the bottom surface of cylindrical portion 9a
0 protrudes, and the third cam 19 is rotatable within a range in which the regulating piece 30 can move in the circumferential direction. Furthermore, on the front surface of the third cam 19, there are provided three second projections 31, 31,... Provided with inclined surfaces in the circumferential direction opposite to the projections 27 of the second cam 18.
Protruding evenly in several places. Here, when the third cam 19 is rotated in the direction of the inclined surface of the second projection 31, each projection 27 of the second cam 18 is moved by the guidance of the inclined surface to each second projection 3.
Thus, the second 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.

On the other hand, the rotation of the third cam 19 is controlled by the cylindrical portion 9a.
Is performed by a first change ring 32 as a first switching member rotatably fitted to the front end of the first change ring. 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.
9 are engaged with each other, and a pair of connecting pieces 35, 3 protruding from the side surface of the bearing box 33.
When the first change ring 32 is rotated by the rotation of the first change ring 32, the bearing box 33 is rotated by the gripping portions 36, 36 on the rear surface of the first change ring 32. Are synchronized. The forward movement of the first change ring 32 is performed by the flat washer 3 attached to the cylindrical portion 9a.
The rearward movement is regulated by the second change ring 39 as the second switching member which is also rotatably fitted to the cylindrical portion 9a by the circlip 7 and the circlip.

As shown in FIG. 3, two washers 40, 41 are disposed between the first change ring 32 and the second change ring 39. These washers 40, 41 have projections 43, 43,... Which are fitted between a plurality of ridges 42, 42 projecting in the axial direction to the side surface of the cylindrical portion 9a, and are prevented from rotating around the cylindrical portion 9a. Which is externally fitted with
The front washer 40 has a pair of left and right spring pieces 44 and 44 formed by elastically deforming a band-shaped free end along the outer surface of the tubular portion 9a forward, and the tubular portion 9a at the upper center.
A click piece 45 is formed by elastically deforming the center of the strip-shaped free end along the outer surface of the cylindrical member 9a forward. The rear washer 41 has a cylindrical portion 9a on the left side toward the second change ring 39. A click piece 46 is formed by elastically deforming the center of the strip-shaped free end along the back.

A pair of stoppers 47, 47 are curved along the left and right side surfaces of the cylindrical portion 9a and are slidable back and forth between the ridges 42, 42 of the cylindrical portion 9a. The front end of each stopper 47 is a contact piece 48 that penetrates through the two washers 40 and 41 and rises perpendicularly to the axial direction on the rear surface of the first change ring 32. Then, the spring pieces 44, 44 of the washer 40 are in contact with each other to urge the stoppers 47, 47 forward, so as to contact 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 toward the rear) as an inclined surface are provided in a point-symmetrical manner, and the rotation of the first change ring 32 is performed. With the movement operation, the stoppers 47, 47
By moving on or away from 9, 49, the stopper 4
The axial positions of 7, 47 can be adjusted. still,
At the base of the cylindrical portion 9a behind the stoppers 47, 47,
Pressing piece 5 that fits between ridges 42, 42 on the left and right sides of cylindrical portion 9a
A flat washer 50 extending from the first and the first 51 is provided so as to be movable in the axial direction, and when the stoppers 47 and 47 ride on the projections 49 and 49 as the first change ring 32 rotates, the stoppers 47 and 47 are provided. At the rear end thereof comes into contact with the flat washer 50.

On the other hand, a female thread portion 52 is formed on the inner periphery of the second change ring 39, and the female thread portion 52
A spring holder 53 having a male screw portion 55 formed on the outer periphery thereof is screwed into the cylindrical portion 9a so as to be movable only in the axial direction by projections 54, 54,. By rotating the ring 39, the spring holder 53 is screwed in the axial direction, and the axial length of the coil spring 56 disposed between the flat holder and the flat washer 50, that is, the pressing force on the flat washer 50 can be changed. And Behind the flat washer 50, the planetary gear reduction mechanism 10 penetrates through the second gear case 9.
Are arranged in contact with the front surface of the third-stage internal gear 13, and the internal gear 13 is rotatably provided in the first gear case 8. Washer 50 to pin 57,5
The internal gear 13 is fixed by the pressing force of the coil spring 56 transmitted through 7.

Further, on the front surface of the second change ring 39, a plurality of recesses 58, 58,... Into which the click pieces 46 of the washer 41 can be fitted are arranged in the circumferential direction, so that the pressing force by the coil spring 56 is minimized. In the rotation range of the second change ring 39 to be maximized, the click piece 46 is fitted into any of the recesses 58, and a click action for positioning the second change ring 39 is obtained. Similarly, the click piece 4 of the washer 40 is provided on the rear surface of the first change ring 32.
5 are formed at three positions at intervals of 30 ° so that a click action can be obtained at each position. In this case, the first change ring is obtained by looking at the vibration driver drill 1 from the front side. At a first switching position (FIG. 4A) where the click piece 45 is fitted in the concave portion 59 at the left end of the bearing 32, the bearing box 33 and the third cam 19 rotate clockwise, and the second projection 31 and the projection 27 Overlap in the axial direction and push the second cam 18 upward. 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 are in contact with each other, and when the spindle 5 rotates, the spindle 5 slightly moves in the axial direction due to interference between the cam teeth. , A vibration motion of moving back and forth is given. 1 and 4, reference numeral 60 denotes a wave washer which is provided on the spindle 5 between the ball bearing 16 and the large-diameter portion of the spindle 5, and which rotates the spindle 5 in the vibration mode.
The circlip 61 attached to the rear end is the ball bearing 1
5 to have the elasticity to return to the forefront position.

Next, at a second switching position in which the first change ring 32 is rotated counterclockwise by 30 ° from the vibration mode (FIG. 4).
(B)), the second protrusion 3 of the third cam 19 that has been simultaneously rotated counterclockwise.
Since the first and the projections 27 of the second cam 18 are separated from each other in the circumferential direction and the second cam 18 is retracted, the drill mode is set in which the interference between the first cam 17 and the cam teeth is canceled. Therefore, here, the spindle 5 operates only in rotation. Also, in the case of the drill mode and the previous vibration mode, FIG.
As shown in (B), the protrusions 49, 49
47 and presses the contact pieces 48 and 48 rearward,
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 irrespective of the pressing force of the coil spring 56 due to the rotation of the second change ring 39. 13 is firmly fixed.

In the third switching position in which the first change ring 32 is rotated counterclockwise by 30 ° from the drill mode (FIG. 4C), the second projection 31 of the third cam 19 and the second cam 1
8 and the first change ring 3
The two projections 49, 49 are the contact pieces 4 of the stoppers 47, 47.
8 and 48, the stoppers 47 and 47 are advanced by the urging of the spring pieces 44 and 44, and the clutch mode is set to release the pressing of the flat washer 50. In this clutch mode, the internal gear 13 is connected to the coil spring 5 via the flat washer 50 and the pin 57.
6, the load on the spindle 5 increases at the end of the screw tightening and the like, and exceeds the pressing force of the internal gear 13 by the coil spring 56, pushing up the pin 57 and the flat washer 50. 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 displayed stepwise on the side surface of the second change ring 39). An arrow 62 for adjusting 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.

As described above, according to the first embodiment, the stoppers 47 for fixing the internal gear 13 by directly contacting the flat washer 50 are provided separately from the coil spring 56 for adjusting the torque, while the first change is provided. Set the clutch mode (third switching position) on the ring 32,
The rotation of the first change ring 32 causes the stoppers 47, 4 between the vibration mode or the drill mode and the clutch mode.
7, the release of the clutch required in the vibration mode and the drill mode can be performed irrespective of the torque adjustment position by the second change ring 39, and in the vibration mode and the drill mode. Sometimes the clutch does not work. Therefore, vibration mode, drill mode, clutch mode (torque adjustment)
The two operation modes can be easily and reliably switched only by operating the first change ring 32, so that the operation mode is excellent.

<< Embodiment 2 >> Next, another embodiment of the vibration driver drill will be described. Note that the same reference numerals as those in the first embodiment denote the same components, and a description thereof will not be repeated. 5 and 6, a ball bearing 1 is provided on a spindle 5 in a cylindrical portion 9a.
A ring-shaped first cam 63 is fixed so as to be integrally rotatable between 5, 5 and 16, and a first cam tooth 64,
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 are engaged with the spindle 5 and mesh with the first cam teeth 64 on the front surface. And a second cam 66 formed with an engaging tooth 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, 70 is
A coil spring 71 is provided between the large diameter portion of the spindle 5 and the ball bearing 16 and biases the spindle 5 to the foremost position. Pins 71, 71 penetrate the tubular portion 9a orthogonally to fix the ball bearing 16. It is.

On the other hand, a pair of upper and lower cuts 72, 72 are formed in the front end of the cylindrical portion 9a in the axial direction.
The switching levers 73 are movably accommodated in 2.
The switching levers 73, 73 are provided at the rear end extending along the inner periphery of the cylindrical portion 9 a with a claw 74 capable of engaging with the engaging teeth 68 of the second cam 66, and a notch 72 at an intermediate portion through the notch 72. Part 9a
Are formed respectively in the radial direction.
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 three projections 77 on the outer periphery with three recesses 78 on the first change ring 32 side. On the front surface, a step is formed in which two arc portions 79, 79 located at point symmetry are lowered, and one step located at point symmetry at the arc portions 79, 79 becomes inclined surfaces 80, 80. I have. Further, a stopper 47 is provided on the rear surface of the first change ring 32.
A pair of projections, each of which is provided on the inner peripheral side of the circular arc portion 79 and has an interval through which the connecting piece 75 can pass and is parallel to the inclined surface 80, in addition to the projections 49, 49 When the first change ring 32 is rotated, the connecting pieces 75 are formed on the inclined surfaces 80, 82.
The switching levers 73 and 73 are guided relative to each other to move relative to a position where the switching levers 73 ride on the projection 81 and a position where the switching levers 73 and 73 separate from the projection 81, and change the positions of the switching levers 73 and 73 in the axial direction.
And the engaging teeth 68 can be disengaged.

Therefore, in the second embodiment, the first switching position (see FIG. 7A) in which the click piece 45 fits into the recess 59 at the right end of the first change ring 32 when looking at the vibration driver drill 1 from the front side. ), The connecting pieces 75, 75 are
Guided by 0, 82, they ride on the projections 81, 81, and the switching levers 73, 73 are retracted. Then, the nail 74 at the rear end,
74 engages with the engaging teeth 68 of the second cam 66 to
6, the first cam teeth 64 of the first cam 63 rotating integrally with the spindle 5 interfere with the second cam teeth 67 of the second cam 66, and the vibration mode in which the spindle 5 moves back and forth with rotation. Become. In the second switching position where the first change ring is rotated clockwise by 30 ° from there (FIG. 7).
(B)), the projections 81, 81 from the front of the connecting pieces 75, 75
Is moved, the connecting pieces 75, 75 move forward by the guide between the inclined surfaces 80, 82, and the switching levers 73, 73 are advanced. Therefore, the second cam 66 unlocked by the pawls 74, 74 becomes free to rotate, and the spindle 5 enters a drill mode in which only the rotation is performed. In the case of the vibration mode and the drill mode, the projections 49, 49
The third internal gear 13 is firmly fixed irrespective of the torque setting by the second change ring 39, since the flat gears 7 and 47 are pressed rearward to abut the flat washer 50. Then, in the third switching position in which the first change ring 32 is rotated clockwise by 30 ° from the drill mode (FIG. 7 (C)), the positions of the switching levers 73, 73 are kept as they are, and the protrusions 49, 49 is separated from the stoppers 47, 47 to allow the flat washer 50 to move forward.
The clutch mode is set in which the torque of the spindle 5 is adjusted by the change in the pressing force of the coil spring 56 due to the operation of.

As described above, also in the second embodiment, similarly to the first embodiment, since the stoppers 47 for fixing the torque adjusting coil split 3 are controlled by rotating the first change ring 32, the vibration mode and the vibration mode The release of the clutch required in the drill mode can be performed irrespective 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 reliably switched only by operating the first change ring 32, and the operability is excellent.

The number and shape of the stoppers 47 as the regulating members, and the number and shape of the corresponding projections 49 are not limited to the first and second embodiments. The first and second change rings 32 are moved back and forth in the axial direction between the first and second switching positions and the third switching position.
The rotation can be appropriately changed as long as the rotation can be controlled and released. Also, the structure related to the torque adjustment may be a structure in which one or a plurality of steel balls are stacked in the axial direction instead of the pin 57, or a structure in which claws having inclined surfaces are engaged with each other. It is not limited to the content.

[0022]

According to the first aspect of the present invention, a regulating member capable of fixing the internal gear is provided separately from the torque adjusting pressing means, and the first switching member performs only rotation on the spindle. By setting the third switching position to be set and controlling the movement of the regulating member by operating the first switching member, in the case of the vibration mode and the drill mode selected at the first and second switching positions Can be released regardless of the torque adjustment position by the second switching member, and the torque adjustment 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 torque adjustment can be easily and reliably switched only by the operation of the first switching member, and the operability is excellent.

[Brief description of the drawings]

FIG. 1 is a partially sectional explanatory view of a vibration driver drill according to a first embodiment.

FIG. 2 is an exploded explanatory view showing a structure relating to switching of an operation mode in the first embodiment.

FIG. 3 is an exploded explanatory view showing a structure related to torque adjustment in the first embodiment.

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 partially sectional explanatory view of a vibration driver drill according to the second embodiment.

FIG. 6 is an exploded explanatory view showing a structure relating to switching of an operation mode in the second embodiment.

FIG. 7A is an explanatory view showing a vibration mode in the second embodiment. (B) It is explanatory drawing which shows the drill mode in the form 2. FIG. (C) It is explanatory drawing which shows the clutch mode in the form 2.

[Explanation of symbols]

1. Shaking driver drill 2. Body housing 3,
..Motors, 5 spindles, 7 gear assemblies, 8 first gear cases, 9 second gear cases, 9
a 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.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takayasu Kuroyanagi 3-11-8 Sumiyoshicho, Anjo City, Aichi Prefecture Makitanai Co., Ltd. (72) Eiki Ito 3-11-8 Sumiyoshicho, Anjo City, Aichi Prefecture Stock F-term in the company Makita (reference) 3C036 EE27

Claims (1)

[Claims] A first switching member for switching a state of linkage of the cam means with the spindle, the first switching member being provided with a cam means capable of adding an axial vibration motion in association with a spindle; In the first switching 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, the spindle is provided rotatably by a planetary gear reduction mechanism at the preceding stage of the spindle. Internal gear, a pressing means for pressing and fixing the internal gear, and a second switching member capable of adjusting the pressing force of the pressing means are provided, and by operating the second switching member,
A vibration driver drill capable of adjusting a torque for interrupting rotation transmission to the spindle when the internal gear idles, wherein a regulating member capable of fixing the internal gear includes a fixing position of the internal gear and a fixing position of the internal gear. The first switching member is provided so as to be movable between the fixed release position and the third switching position in which only the spindle is rotated by the first switching member. A vibration driver drill, wherein the control member moves to the fixed position between the first switching position and the second switching position, and the release member to the release position at the third switching position.