JPH0117837B2

JPH0117837B2 -

Info

Publication number: JPH0117837B2
Application number: JP21846983A
Authority: JP
Inventors: Hiroyuki Ando; Shinji Ihara
Original assignee: Matsushita Electric Works Ltd
Current assignee: Panasonic Electric Works Co Ltd
Priority date: 1983-11-18
Filing date: 1983-11-18
Publication date: 1989-04-03
Also published as: JPS60114474A

Description

[Detailed description of the invention]

〔技術分野〕この発明は振動ドリルに関するものである。〔背景技術〕従来、振動ドリルとして、第１図に示すものが
用いられている。すなわち、モータ７１の回転を
ピニオン７２および減速歯車７３を介して減速し
てラチエツト７４に伝え、このラチエツト７４を
出力軸７５に作用する押付反力で固定ラチエツト
７６に噛み合せて微振動を与えるようにしたもの
である。しかし、モータ軸７１ａと出力軸７５とが一直
線上にないため、ハウジング７７にデツドスペー
スができてハウジング７７の胴部が太くなつてい
る。そのため、出力軸７５に取付けられるビツト
が見難くなつて使い勝手が悪く、また太くなるこ
とから重畳も重くなつて長時間作業で被れ易くな
る。また、第２図のように、ドリルの支持点となる
ビツト先端Ｐと、握り部荷重点Ｒが、モータ軸７
１ａとビツト軸７５の位置ずれ分だけ余分に離れ
ることにより、重心Ｇに対する偶力モーメントＭ
が大きくなり、使用時のドリルの保持が不安定と
なつて使い勝手が悪い。すなわち、モータ軸７１
ａとビツト軸７５が一直線上になくεだけずれて
いると、L₁はεだけ大きくなり、したがつて使
用時にドリルに生じるモーメントＭも大きくな
る。なお、Ｆはビツト押付力、F′はその反力、Ｗ
は作業者によるドリル推力である。また、従来、空気ハンマ式の振動ドリルも用い
られているが、これにおいてもモータ軸とビツト
軸とがずれていることから、上記と同様な問題が
ある。〔発明の目的〕この発明は、穴あけ作業時にビツトの先端が見
易くて使い勝手が良く、また小型軽量化されて長
時間の作業にも疲れ難い振動ドリルを提供するこ
とを目的とする。〔発明の開示〕この発明の振動ドリルは、モータの回転軸と、
ハンマと、出力軸とを同一軸心上に配置したもの
である。実施例この発明の一実施例を第３図ないし第７図に示
す。図において、１はハウジングであり、筒部１
ａと、その後端に延設したグリツプ２と、筒部１
ａの後端に重合して設けた電池収容室３とからな
る。筒部１ａ内に、モータ４と、ハンマ５と、出
力軸６とを同一軸心Ｌ上に並べて収容し、かつそ
の軸心Ｌと平行に減速軸７を収容してある。筒部
１ａに電池収容室３と隣り合つて膨出部１ｂを設
け、この膨出部１ｂにドリル機能とドリルハハン
マ機能との切替機構８を収容してある。出力軸６
はビツト９を取付けるチヤツク１０を取付けたも
のであり、ハウジング１の先端の軸受１１に回転
および進退自在に支持されている。１２は軸受台
である。回転伝達機構を説明する。減速軸７は両端で軸
受１３およびメタル軸受１４により支持されてお
り、両端に第１の減速歯車１５およびピニオン１
６が設けられている。第１の減速歯車１５はモー
タ４の回転軸４ａに固定されたピニオン１７に噛
み合つている。減速軸７の先端のピニオン１６
は、出力軸６の外周のギヤ固定リング１８に固定
された第２の減速歯車１９に噛み合つている。ギ
ヤ固定リング１８は、出力軸６のスプライン溝２
０にボール２１で係合している。減速軸７の一端
の軸受１３は、モータ固定台２２に設けられてい
る。モータ固定台２２はハウジング１にボルトナ
ツト２３で固定されたクランプ軸受台２４にビス
固定されている。打撃機構を説明する。ガイドシリンダ２５がモ
ータ固定台２２に固定してあり、ガドシリンダ２
５内にハンマ５を軸方向移動自在に嵌挿し、かつ
進退軸２６の一端の駆動子２７を収容してある。
２８はシリンダキヤツプである。ハンマ５は出力
軸６の後端を軸方向移動自在に嵌入させた凹部を
有する。ハンマ５と駆動子２７とはばね２９で連
結する。進退軸２６はモータ固定台２２内のメタ
ル軸受３１で進退自在に支持されている。進退軸
２６は駆動リング３２に連結されており、駆動リ
ング３２は軸心ピン３３が貫通した長孔を有す
る。この長孔は、進退軸２６と直交する方向に長
く延びている。偏心ピン３３は外周にローラ３４
を有する。偏心ピン３３は一対の偏心軸３５，３
６に固定されたものである。偏心軸３５，３６は
軸受３７，３８でモータ固定台２２に支持されて
いる。一方の偏心軸３６は、傘歯車３９が固定さ
れており、これに噛み合う傘歯車４０を介して減
速軸７から回転伝達される。切替機構８を説明する。第５図のように、傘歯
車４０は滑りキー４１で減速軸７に係合させてあ
り、キー４１をスライドさせて傘歯車４０のキー
溝４２に係脱させるキー移動板４３がキー４１に
結合してある。キー移動板４３はハウジング１の
ガイド溝４４に取付けてある。キー移動板４３
は、ハウジング１から一部が突出してスライド自
在に設けられた切替ハンドル４５に係合し、ばね
４７で押付けられている。切替ハンドル４５はガ
イド溝４６に取付けられている。傘歯車４０には
キー脱落防止リング４０ａが設けてある。その他、電池４８は電池収容室３内に電池カバ
ー４９で押えつけられている。５０は電池４８の
端子板４８ａに接する接触金具、５１はスイツチ
である。そのスイツチハンドル５２は、モータ４
の軸心Ｌ上に配置してある。５３はハウジング１
に設けた手の滑り防止突起である。動作モータ４の回転は、減速軸７を介して出力軸６
に伝えられる。また、モータ４の回転は、減速軸
７から傘歯車３９，４０に伝えられ、偏心ピン３
３により進退軸２６の進退運動に変換される。進
退軸２６の進退運動は、駆動子２７およびばね２
９を経てハンマ５に伝えられ、ハンマ５はその往
復動により出力軸６を打撃する。第６図Ａ〜Ｄお
よび第７図は、その打撃動作を示す。第６図Ａ〜
Ｄは、第７図のＡ〜Ｄの状態を示す。打撃原理を説明する。通常、第８図のような質
量体ｍと、ばね定数ｋのばね体と抵抗体ｃとの組
合せ系を考えた場合、振幅の周波数特性は第９図
のようになる。ここで、X₀；駆動ピストンの振
幅（mm）、Ｘ；ハンマの振幅（mm）、ω；駆動角速
度（rad.／sec.）、ω₀；系の固有振動数（rad.／
sec.）、 [Technical Field] This invention relates to a vibrating drill. [Background Art] Conventionally, a vibration drill shown in FIG. 1 has been used as a vibration drill. That is, the rotation of the motor 71 is decelerated through the pinion 72 and the reduction gear 73 and transmitted to the ratchet 74, and the ratchet 74 is engaged with the stationary ratchet 76 by the pressing reaction force acting on the output shaft 75 to give slight vibrations. This is what I did. However, since the motor shaft 71a and the output shaft 75 are not in a straight line, a dead space is created in the housing 77, and the body of the housing 77 becomes thick. As a result, the bits attached to the output shaft 75 are difficult to see, making them inconvenient to use, and since they are thicker, they become heavier and more likely to overlap during long hours of work. Also, as shown in Fig. 2, the bit tip P, which is the support point of the drill, and the load point R of the grip are aligned with the motor shaft 7.
1a and the bit axis 75 by the amount of positional deviation, the couple moment M with respect to the center of gravity G is reduced.
becomes large, making it difficult to hold the drill during use, making it difficult to use. That is, the motor shaft 71
If a and the bit axis 75 are not in a straight line but deviate by ε, _L1 will increase by ε, and therefore the moment M generated in the drill during use will also increase. In addition, F is the bit pressing force, F' is the reaction force, and W
is the drill thrust by the operator. In addition, an air hammer type vibrating drill has been used in the past, but this also has the same problem as the above because the motor shaft and the bit shaft are misaligned. [Object of the Invention] An object of the present invention is to provide a vibration drill that is easy to use because the tip of the bit is easy to see during drilling work, is small and lightweight, and is not tiring even during long hours of work. [Disclosure of the Invention] The vibration drill of the present invention includes a rotating shaft of a motor,
The hammer and the output shaft are arranged on the same axis. Embodiment An embodiment of the present invention is shown in FIGS. 3 to 7. In the figure, 1 is a housing, and a cylindrical part 1
a, a grip 2 extending to the rear end, and a cylindrical portion 1.
It consists of a battery accommodating chamber 3 which is superimposed on the rear end of a. A motor 4, a hammer 5, and an output shaft 6 are housed side by side on the same axis L, and a deceleration shaft 7 is housed parallel to the axis L in the cylindrical portion 1a. A bulging part 1b is provided in the cylindrical part 1a adjacent to the battery storage chamber 3, and a switching mechanism 8 between a drill function and a drill hammer function is housed in this bulge part 1b. Output shaft 6
A chuck 10 for mounting the bit 9 is attached, and the chuck 10 is supported by a bearing 11 at the tip of the housing 1 so that it can rotate and move back and forth. 12 is a bearing stand. The rotation transmission mechanism will be explained. The reduction shaft 7 is supported by bearings 13 and metal bearings 14 at both ends, and has a first reduction gear 15 and a pinion 1 at both ends.
6 is provided. The first reduction gear 15 meshes with a pinion 17 fixed to the rotating shaft 4a of the motor 4. Pinion 16 at the tip of the reduction shaft 7
is meshed with a second reduction gear 19 fixed to a gear fixing ring 18 on the outer periphery of the output shaft 6. The gear fixing ring 18 is attached to the spline groove 2 of the output shaft 6.
0 by the ball 21. A bearing 13 at one end of the deceleration shaft 7 is provided on a motor fixing base 22 . The motor fixing stand 22 is screwed to a clamp bearing stand 24 which is fixed to the housing 1 with bolts and nuts 23. The striking mechanism will be explained. A guide cylinder 25 is fixed to the motor fixing base 22, and the guide cylinder 25 is fixed to the motor fixing base 22.
The hammer 5 is fitted into the shaft 5 so as to be movable in the axial direction, and a driver 27 at one end of the forward/backward shaft 26 is accommodated.
28 is a cylinder cap. The hammer 5 has a recess into which the rear end of the output shaft 6 is fitted so as to be movable in the axial direction. The hammer 5 and the driver 27 are connected by a spring 29. The forward and backward shaft 26 is supported by a metal bearing 31 within the motor fixing base 22 so as to be freely forward and backward. The forward/backward shaft 26 is connected to a drive ring 32, and the drive ring 32 has an elongated hole through which an axial pin 33 passes. This elongated hole extends long in a direction perpendicular to the forward/backward axis 26. The eccentric pin 33 has a roller 34 on its outer periphery.
has. The eccentric pin 33 is connected to a pair of eccentric shafts 35, 3
It is fixed at 6. The eccentric shafts 35 and 36 are supported by the motor fixing base 22 by bearings 37 and 38. A bevel gear 39 is fixed to one eccentric shaft 36, and rotation is transmitted from the deceleration shaft 7 via a bevel gear 40 that meshes with the bevel gear 39. The switching mechanism 8 will be explained. As shown in FIG. 5, the bevel gear 40 is engaged with the deceleration shaft 7 by a sliding key 41, and a key moving plate 43 that slides the key 41 into and out of the key groove 42 of the bevel gear 40 is attached to the key 41. It is combined. The key moving plate 43 is attached to the guide groove 44 of the housing 1. Key moving plate 43
is engaged with a switching handle 45 that is slidably provided with a portion protruding from the housing 1, and is pressed by a spring 47. The switching handle 45 is attached to the guide groove 46. The bevel gear 40 is provided with a key fall prevention ring 40a. In addition, the battery 48 is held down inside the battery housing chamber 3 by a battery cover 49. 50 is a contact metal fitting that contacts the terminal plate 48a of the battery 48, and 51 is a switch. The switch handle 52 is connected to the motor 4.
It is arranged on the axis L of. 53 is housing 1
This is a protrusion that prevents the hand from slipping. Operation The rotation of the motor 4 is transmitted to the output shaft 6 via the deceleration shaft 7.
can be conveyed to. Further, the rotation of the motor 4 is transmitted from the reduction shaft 7 to the bevel gears 39 and 40, and the rotation of the motor 4 is transmitted to the bevel gears 39 and 40,
3, it is converted into a forward and backward movement of the forward and backward axis 26. The forward and backward movement of the forward and backward shaft 26 is controlled by the driver 27 and the spring 2.
9 to the hammer 5, and the hammer 5 strikes the output shaft 6 by its reciprocating motion. FIGS. 6A to 6D and FIG. 7 show the striking action. Figure 6 A~
D shows the states A to D in FIG. Explain the principle of hitting. Normally, when considering a combination system of a mass body m, a spring body with a spring constant k, and a resistor c as shown in FIG. 8, the amplitude frequency characteristic becomes as shown in FIG. 9. Here, X ₀ ; _Amplitude of driving piston (mm),
sec.),

〔Effect of the invention〕

この発明の振動ドリルは、穴あけ作業時にビツ
トおよびビツトの先端が見易くて使い勝手が良
く、また小型軽量化されて長時間の作業にも疲れ
難いという効果がある。 The vibratory drill of the present invention has the advantage that the bit and the tip of the bit are easy to see during drilling work, making it easy to use, and it is also small and lightweight, making it less tiring to work for long periods of time.

[Brief explanation of drawings]

第１図は従来例の切欠側面図、第２図はその作
用説明図、第３図はこの発明の一実施例の縦断側
面図、第４図は第３図の−線断面図、第５図
Ａ，Ｂはその切替動作の説明図、第６図Ａ〜Ｄは
同じくその打撃動作の説明図、第７図は同じくそ
のハンマとピストンの位相の説明図、第８図は同
じくその原理説明図、第９図は同原理説明図の振
幅説明図、第１０図は他の実施例の縦断側面図、
第１１図はさらに他の実施例の縦断側面図、第１
２図は第１１図のXII−XII線断面図、第１３図は同
断面における変形例の説明図である。１，１′，１″……ハウジング、１ａ……筒部、
１ｂ……膨出部、２……グリツプ、３……電池収
容室、４……モータ、５……ハンマ、６……出力
軸、７……減速軸、８……切替機構、９……ビツ
ト、１０……チヤツク、１５……第１の減速歯
車、１９……第２の減速歯車、２５……ガイドシ
リンダ、２６……進退軸、２７……駆動子、２９
……ばね、３３……偏心ピン、３９，４０……傘
歯車、４１……キー、４５……切替ハンドル、５
２……スイツチハンドル、Ｌ……軸心。 Fig. 1 is a cutaway side view of the conventional example, Fig. 2 is an explanatory view of its operation, Fig. 3 is a longitudinal sectional side view of an embodiment of the present invention, Fig. 4 is a sectional view taken along the - line in Fig. 3, and Fig. 5 Figures A and B are illustrations of the switching operation, Figures 6A to D are illustrations of the striking operation, Figure 7 is an illustration of the phase of the hammer and piston, and Figure 8 is an explanation of the principle. 9 is an amplitude explanatory diagram of the same principle explanatory diagram, and FIG. 10 is a vertical sectional side view of another embodiment.
FIG. 11 is a vertical sectional side view of still another embodiment, the first
2 is a cross-sectional view taken along the line XII-XII of FIG. 11, and FIG. 13 is an explanatory view of a modification of the same cross-section. 1, 1', 1''...Housing, 1a...Cylinder part,
1b...Bulge, 2...Grip, 3...Battery chamber, 4...Motor, 5...Hammer, 6...Output shaft, 7...Deceleration shaft, 8...Switching mechanism, 9... Bit, 10...Chuck, 15...First reduction gear, 19...Second reduction gear, 25...Guide cylinder, 26...Advance/retreat axis, 27...Driver, 29
... Spring, 33 ... Eccentric pin, 39, 40 ... Bevel gear, 41 ... Key, 45 ... Switching handle, 5
2...Switch handle, L...Axis center.

Claims

[Claims] 1. A rotating shaft of a motor, a pinion fixed to the rotating shaft, a hammer that reciprocates by being driven by the rotating shaft, and an output shaft driven by the hammer are arranged on the same axis. a deceleration shaft is disposed parallel to the shaft center, and first and second
A deceleration means is provided, and a hammer drive means for reciprocating the hammer is provided between these deceleration means, and the hammer drive means connects the deceleration shaft and the hammer to convert rotation into reciprocation. and a housing chamber that accommodates a power supply section of the motor is provided in a housing that accommodates all of the components. 2. Claim 1, wherein the power supply unit is composed of a battery, and the battery is disposed on the same axis as the rotation axis, the hammer, and the output shaft of the motor.
Vibration drill as described in section. 3. The vibration drill according to claim 1, wherein a grip is formed on the housing, the grip intersects with the deceleration shaft, and the power source is provided within the grip. 4. The vibration drill according to claim 1, wherein the hammer drive means is provided with a switching means between a drill function that causes the output shaft to perform only rotation and a hammer drill function that causes the output shaft to perform rotation and impact. . 5. Claim 1, wherein a switch operator for turning on and off the motor is arranged on the same axis as the rotation shaft of the motor and the hammer.
Vibration drill as described in section. 6. A patent in which a portion of the housing that accommodates the hammer, the output shaft, and the deceleration shaft is cylindrical, and a portion of the grip that accommodates the battery is partially overlapped with the cylindrical housing portion. A vibratory drill according to claim 3. 7. A portion of the housing that accommodates the hammer, the output shaft, and the deceleration shaft is cylindrical, and a bulge is formed in a portion of the cylindrical portion that accommodates the first deceleration means and the hammer drive means. 5. The vibration drill according to claim 4, wherein the switching means is provided in the bulged portion.