JP5525386B2

JP5525386B2 - Impact rotary tool

Info

Publication number: JP5525386B2
Application number: JP2010190020A
Authority: JP
Inventors: 光政水野; 穣山田; 敏治大橋; 秀規清水
Original assignee: Panasonic Corp; Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Corp; Panasonic Holdings Corp
Priority date: 2010-08-26
Filing date: 2010-08-26
Publication date: 2014-06-18
Anticipated expiration: 2030-08-26
Also published as: JP2012045670A

Description

本発明は、インパクトレンチやインパクトドライバー等の打撃動作を伴って回転駆動を伝達するインパクト回転工具に関するものである。 The present invention relates to an impact rotary tool that transmits rotational drive with an impact operation such as an impact wrench or impact driver.

従来からインパクト回転工具は、駆動源であるモータと、モータにより回転するハンマと、ハンマに打撃されて回転を伝達するアンビルと、アンビルの回転を出力する出力部と、からなる（例えば、特許文献１等参照）。 Conventionally, an impact rotary tool includes a motor that is a driving source, a hammer that is rotated by the motor, an anvil that is struck by the hammer and transmits the rotation, and an output unit that outputs the rotation of the anvil (for example, Patent Documents). 1 etc.).

このようなものでは、ハンマが軸方向に移動しながら回転して打撃を行うため、ハンマに衝突されたアンビルには、モータからの回転駆動である回転方向（軸の周方向）の力の他に、軸方向の力も与えられている。そして、この軸方向の力は、出力部に取り付けられた先端工具と、該先端工具により締付けあるいは緩められるネジ等の被締付部材と、の接触部位を振動させるため、工具使用時に騒音を発生させる原因になっている。そのため、特許文献１等では、ハンマを回転させる駆動軸とアンビルの軸方向の隙間に緩衝材を配置して、アンビルが軸方向に振動することを抑制して、先端工具と被締付部材の間から発生する騒音を低減している。 In such a case, since the hammer rotates and strikes while moving in the axial direction, the anvil collided with the hammer has a force in the rotational direction (the circumferential direction of the shaft) that is a rotational drive from the motor. In addition, axial forces are also provided. This axial force vibrates the contact part between the tip tool attached to the output section and the member to be tightened such as a screw that is tightened or loosened by the tip tool, generating noise when using the tool. It is a cause. For this reason, in Patent Document 1 and the like, a cushioning material is arranged in the axial gap between the drive shaft for rotating the hammer and the anvil to suppress the anvil from vibrating in the axial direction, and the tip tool and the tightened member Noise generated from the space is reduced.

特開平０７−２３７１５２号公報JP 07-237152 A

しかしながら、これら従来のものでは、軸方向の力により発生する騒音は低減できるが、ハンマとアンビルの衝突時（打撃時）に回転方向の力により発生する騒音（衝突音）を低減できないという問題がある。 However, these conventional devices can reduce the noise generated by the axial force, but cannot reduce the noise (collision sound) generated by the rotational force when the hammer and the anvil collide (when hit). is there.

そこで、この事情に鑑み、打撃時に、回転方向の力により発生する騒音を低減したインパクト回転工具を提供することを課題とした。 Therefore, in view of this situation, an object of the present invention is to provide an impact rotary tool that reduces noise generated by force in the rotational direction at the time of impact.

この課題を解決するために、本発明のインパクト回転工具は、モータを有した駆動部と、前記駆動部の回転駆動を出力する出力部と、前記駆動部の回転駆動を打撃動作を伴って前記出力部に伝達する打撃部と、を有し、前記打撃部が、前記駆動部により回転するハンマと、前記ハンマに打撃される被打撃面を有すると共に前記出力部に回転駆動を伝達するアンビルと、前記アンビルに取り付けられると共に前記アンビルより剛性の低い緩衝部材と、からなり、前記緩衝部材が前記被打撃面より前記アンビルの回転方向に突出したものであることを特徴とする。 In order to solve this problem, an impact rotary tool according to the present invention includes a drive unit having a motor, an output unit that outputs the rotation drive of the drive unit, and the rotation drive of the drive unit with a striking operation. A hammer part that transmits to the output part, and the hammer part has a hammered surface that is struck by the hammer, and an anvil that transmits the rotational drive to the output part. The cushioning member is attached to the anvil and has a lower rigidity than the anvil. The cushioning member protrudes from the hit surface in the rotation direction of the anvil.

このインパクト回転工具として、前記緩衝部材が均一な厚さで回転方向に突出したものであることが好ましい。 As the impact rotating tool, it is preferable that the buffer member protrudes in the rotation direction with a uniform thickness.

このインパクト回転工具として、前記緩衝部材が不均一な厚さで回転方向に突出したものであることが好ましい。 As this impact rotary tool, it is preferable that the buffer member protrudes in the rotational direction with a non-uniform thickness.

このインパクト回転工具として、前記アンビルが回転方向に突出した突起を有し、前記突起が突出した先端に前記被打撃面を有したものであることが好ましい。 As the impact rotating tool, it is preferable that the anvil has a protrusion protruding in the rotation direction, and the hit surface is provided at a tip from which the protrusion protrudes.

このインパクト回転工具として、前記緩衝部材より剛性の高い剛性部材を有し、前記剛性部材が前記緩衝部材を介して前記アンビルに取り付けられたものであることが好ましい。 It is preferable that the impact rotating tool has a rigid member having higher rigidity than the buffer member, and the rigid member is attached to the anvil via the buffer member.

このような構成としたことで、打撃時に、回転方向の力により発生する騒音を低減することができる。 By adopting such a configuration, it is possible to reduce noise generated by force in the rotational direction at the time of impact.

本発明の実施形態の一例のインパクト回転工具の要部断面図である。It is principal part sectional drawing of the impact rotary tool of an example of embodiment of this invention. 同上の要部の斜視図である。It is a perspective view of the principal part same as the above. 同上の打撃部を軸方向に視た平面図である。It is the top view which looked at the hit | damage part same as the above in the axial direction. 同上のアンビルを軸方向に視た平面図である。It is the top view which looked at the anvil same as the above in the axial direction. 同上の変形例のアンビルを軸方向に視た平面図である。It is the top view which looked at the anvil of the modification same as the above in the axial direction. 他の実施形態の一例のアンビルを軸方向に視た平面図である。It is the top view which looked at the anvil of an example of other embodiments in the direction of an axis.

以下、インパクト回転工具の実施形態を図面に基づいて説明する。 Hereinafter, an embodiment of an impact rotary tool will be described based on the drawings.

実施形態の一例のインパクト回転工具は、図１に示すように、駆動源であるモータ６が収納された円筒部４と、円筒部４の周面に一端が接続された把持部２と、把持部２の他端に設けられた電源部（特に図示しない）と、からなる。そして、外装は、二つ割りのハウジング１で構成されており、図１は両ハウジング１の継ぎ目で切断した図である。 As shown in FIG. 1, the impact rotary tool according to the embodiment includes a cylindrical portion 4 in which a motor 6 as a driving source is housed, a gripping portion 2 having one end connected to the peripheral surface of the cylindrical portion 4, and a grip And a power supply unit (not particularly shown) provided at the other end of the unit 2. And the exterior is comprised with the housing 1 divided into two, FIG. 1 is the figure cut | disconnected by the joint line of both the housings 1. FIG.

把持部２は、モータ６の回転速度等を操作するトリガスイッチ３と、インパクト回転工具を制御する制御回路（特に図示しない）と、を備えている。そして、電源部は二次電池やバッテリー等を有した電池パックからなり、把持部２に脱着自在で取り付けられている。更に、電源部は制御回路及びモータ６に電力を供給すると共に、電池パックの容量や残量等の情報を制御回路に出力している。なお、電源部は外部の商用電源とインパクト回転工具を電気的に接続する接続コードからなるものであってもよい。 The grip portion 2 includes a trigger switch 3 that operates the rotational speed of the motor 6 and the like, and a control circuit (not shown) that controls the impact rotary tool. The power supply unit is composed of a battery pack having a secondary battery, a battery, and the like, and is detachably attached to the grip unit 2. Further, the power supply unit supplies power to the control circuit and the motor 6 and outputs information such as the capacity and remaining amount of the battery pack to the control circuit. The power supply unit may be composed of a connection cord for electrically connecting an external commercial power supply and the impact rotary tool.

また、円筒部４は、図１乃至図４に示すように、モータ６を有した駆動部５と、駆動部５の回転駆動を出力する出力部２３と、駆動部５の回転駆動を打撃動作を伴って出力部２３に伝達する打撃部９と、を備えている。 Further, as shown in FIG. 1 to FIG. 4, the cylindrical portion 4 performs a striking operation with a driving portion 5 having a motor 6, an output portion 23 that outputs rotational driving of the driving portion 5, and rotational driving of the driving portion 5. And a striking unit 9 that transmits to the output unit 23.

駆動部５は、ブラシレス型のモータ６と、モータ６の回転駆動を減速して打撃部９に伝達する減速部８と、を有しており、減速部８は、例えば、遊星減速機構である。そして、打撃部９は、モータ６により回転するハンマ１２と、ハンマ１２に打撃されて回転するアンビル１５と、を備えたインパクト機構であり、詳細は後述する。 The drive unit 5 includes a brushless motor 6 and a speed reduction unit 8 that reduces the rotational drive of the motor 6 and transmits it to the striking unit 9. The speed reduction unit 8 is, for example, a planetary speed reduction mechanism. . The striking unit 9 is an impact mechanism that includes a hammer 12 that is rotated by the motor 6 and an anvil 15 that is struck by the hammer 12 and rotates. The details will be described later.

出力部２３は回転駆動を外部に出力する出力軸２４からなり、出力軸２４の先端は先端工具（特に図示しない）を脱着自在に取り付けるチャック２５になっており、出力部２３は先端工具を回転させることで、回転駆動を外部に出力している。そして、モータ６の回転軸７と、打撃部９のハンマ１２及びアンビル１５の回転中心と、出力部２３の出力軸２４は、略同一直線上に並んで配置されている。 The output unit 23 includes an output shaft 24 that outputs rotational drive to the outside, and the tip of the output shaft 24 is a chuck 25 for detachably attaching a tip tool (not shown), and the output unit 23 rotates the tip tool. As a result, the rotational drive is output to the outside. The rotation shaft 7 of the motor 6, the rotation center of the hammer 12 and the anvil 15 of the striking unit 9, and the output shaft 24 of the output unit 23 are arranged side by side on substantially the same straight line.

以下、回転軸７等の並ぶ直線を軸方向とし、該軸方向に視た形状を平面視とし、ハンマ１２やアンビル１５が回転する回転円の円周に沿った方向を回転方向とし、該回転円の中心から外周への径に沿った向きをラジアル方向として打撃部９を説明する。 Hereinafter, the straight line of the rotating shaft 7 or the like is the axial direction, the shape viewed in the axial direction is a plan view, and the direction along the circumference of the rotating circle around which the hammer 12 or the anvil 15 rotates is the rotating direction. The striking portion 9 will be described with the direction along the diameter from the center of the circle to the outer periphery as a radial direction.

打撃部９は、減速部８から回転駆動が入力される駆動軸１０と、駆動軸１０により回転するハンマ１２と、ハンマ１２に打撃されるアンビル１５と、駆動軸１０とハンマ１２を接続するカム部１１と、を有している。そして、駆動軸１０は、モータ６に近い側の端部に減速部８が接続されており、他方の端部の外周にハンマ１２がカム部１１を介して取り付けられている。そして、ハンマ１２はカム部１１により軸方向に移動自在で、且つ駆動軸１０により回転されるものとなっている。なお、符号２６はハンマをアンビル側に付勢する付勢ばねである。 The striking unit 9 includes a drive shaft 10 to which rotational drive is input from the speed reduction unit 8, a hammer 12 that is rotated by the drive shaft 10, an anvil 15 that is struck by the hammer 12, and a cam that connects the drive shaft 10 and the hammer 12. Part 11. The drive shaft 10 has a speed reduction portion 8 connected to an end portion near the motor 6, and a hammer 12 is attached to the outer periphery of the other end portion via a cam portion 11. The hammer 12 is movable in the axial direction by the cam portion 11 and is rotated by the drive shaft 10. Reference numeral 26 denotes a biasing spring that biases the hammer toward the anvil.

そのため、打撃部９は、駆動軸１０の一端から回転駆動が入力されると、カム部１１を介してハンマ１２を回転させて、ハンマ１２をアンビル１５に衝突させる打撃動作を行っている。そして、ハンマ１２及びアンビル１５は、打撃動作に伴う衝突に耐えられる程度の高い剛性を有した剛性材料で形成されている。なお、剛性材料とは、例えば、鉄やステンレス、あるいはチタン等の金属部材であり、高い剛性とは、打撃時の衝突で、ヒビ割れや欠け落ち等の破損や、彎曲や凹み等の形状変形等を生じ難い程度の剛性である。 Therefore, when the rotational drive is input from one end of the drive shaft 10, the striking unit 9 performs a striking operation in which the hammer 12 is rotated via the cam unit 11 and the hammer 12 collides with the anvil 15. The hammer 12 and the anvil 15 are made of a rigid material having such a high rigidity that it can withstand a collision caused by a striking motion. The rigid material is, for example, a metal member such as iron, stainless steel, or titanium, and the high rigidity is the damage at the time of impact, such as cracking or chipping, or deformation such as bending or dent. The rigidity is such that it does not easily occur.

また、ハンマ１２はアンビル１５に衝突する突出部１３を複数（実施例では二つ）備えており、突出部１３はハンマ１２のアンビル１５側の端部から軸方向に突出してハンマ１２と一体で設けられている。そして、突出部１３は平面視略三角形の角柱状で突出しており、三角形の角の一つをハンマ１２の回転中心に向けると共に、残りの角を回転方向に並べて配置されている。更に、平面視において、突出部１３は互いにハンマ１２の回転中心を基点として点対称で位置しており、角柱の回転方向を向く側面が、打撃時にアンビル１５と接触する打撃面１４になっている。 The hammer 12 includes a plurality of protrusions 13 (two in the embodiment) that collide with the anvil 15, and the protrusions 13 protrude in the axial direction from the end of the hammer 12 on the anvil 15 side and are integrated with the hammer 12. Is provided. The protruding portion 13 protrudes in a prismatic shape having a substantially triangular shape in plan view, with one of the triangular corners facing the rotation center of the hammer 12 and the remaining corners arranged in the rotational direction. Further, in a plan view, the projecting portions 13 are positioned symmetrically with respect to each other with respect to the rotation center of the hammer 12, and a side surface facing the rotation direction of the prism is a striking surface 14 that contacts the anvil 15 at the time of striking. .

アンビル１５はハンマ１２及び駆動軸１０と略同芯で回転自在になっており、回転中心と略同芯で配置された平面視略環状の本体部１６と、突出部１３が衝突する平面視矩形状の接触部１７と、からなる。そして、本体部１６は出力軸２４に接続されており、アンビル１５の回転を出力軸２４に伝達している。更に、接触部１７は突出部１３と同数で本体部１６からラジアル方向に突出して設けられており、接触部１７と本体部１６は平面視においてアンビル１５の回転中心を通る同一直線上に並んでいる。すなわち、アンビル１５は本体部１６の外周に二つの接触部１７を有すると共に、接触部１７が本体部１６を介して互いに背中を向けて配置されている。 The anvil 15 is substantially concentric with the hammer 12 and the drive shaft 10 and is rotatable. The anvil 15 is rectangular in plan view where the projecting portion 13 collides with the substantially annular main body portion 16 arranged substantially concentrically with the rotation center. And a contact portion 17 having a shape. The main body portion 16 is connected to the output shaft 24 and transmits the rotation of the anvil 15 to the output shaft 24. Further, the contact portions 17 are provided in the same number as the protrusions 13 so as to protrude in the radial direction from the main body portion 16, and the contact portions 17 and the main body portion 16 are aligned on the same straight line passing through the rotation center of the anvil 15 in plan view. Yes. That is, the anvil 15 has two contact portions 17 on the outer periphery of the main body portion 16, and the contact portions 17 are arranged with their backs facing each other through the main body portion 16.

そして、接触部１７は回転方向を向く両側に夫々、軸方向に平行な側面１８と、回転方向に突出した突起１９と、を有しており、突起１９は側面１８より外周側に位置している。この突起１９は回転方向の先端部２０が側面１８と略平行な平面形状になっており、先端部２０が突出部１３に打撃される被打撃面となっている。 And the contact part 17 has the side surface 18 parallel to an axial direction, and the protrusion 19 which protruded in the rotation direction on the both sides which face a rotation direction, respectively, and the protrusion 19 is located in the outer peripheral side from the side surface 18. Yes. This protrusion 19 has a planar shape in which the front end portion 20 in the rotation direction is substantially parallel to the side surface 18, and the front end portion 20 is a hit surface to be hit by the protruding portion 13.

また、接触部１７の側面１８には矩形状の緩衝部材２１が取り付けられており、緩衝部材２１はアンビル１５より剛性の低い柔軟な部材で形成されており、柔軟な部材とは、例えば、エラストマーや、軟質ゴム等の粘性と弾性を併せ持つ固体の粘弾性体等である。なお、粘弾性体とは、打撃時にハンマ１２に押されて彎曲や凹みあるいは圧縮等の形状変形を生じると共に、このハンマ１２から開放されると、膨張等の形状変形を生じて、打撃前と略同様の元の形状（本例では矩形）に戻るものである。 In addition, a rectangular buffer member 21 is attached to the side surface 18 of the contact portion 17, and the buffer member 21 is formed of a flexible member having rigidity lower than that of the anvil 15. And a solid viscoelastic body having both viscosity and elasticity such as soft rubber. The viscoelastic body is pressed by the hammer 12 at the time of hitting to cause shape deformation such as bending, dent or compression, and when released from the hammer 12, it causes shape deformation such as expansion, and so on. It returns to a substantially similar original shape (in this example, a rectangle).

詳しくは、緩衝部材２１が側面１８と略同寸同形の端面を有した角柱形状であると共に、両端面は互いに略平行で形成されており、両端面間の寸法である角柱の高さ（突出厚さＬ１）が略均一になっている。そして、一方の端面は側面１８に固定されており、他方の端面２２は被打撃面より突出して位置しており、緩衝部材２１は、アンビル１５の突起１９より内周側に配置されると共に、突起１９より回転方向に突出している。更に、緩衝部材２１は突起１９とラジアル方向に並んでおり、緩衝部材２１の外周側の面と突起１９の内周側の面が接触している。 Specifically, the cushioning member 21 has a prismatic shape having an end surface that is substantially the same shape and shape as the side surface 18, and both end surfaces are formed substantially parallel to each other, and the height (protrusion) of the prism that is the dimension between both end surfaces. The thickness L1) is substantially uniform. One end surface is fixed to the side surface 18, the other end surface 22 is positioned so as to protrude from the hit surface, and the buffer member 21 is disposed on the inner peripheral side from the protrusion 19 of the anvil 15, It protrudes in the rotational direction from the protrusion 19. Furthermore, the buffer member 21 is aligned with the protrusion 19 in the radial direction, and the outer peripheral surface of the buffer member 21 and the inner peripheral surface of the protrusion 19 are in contact with each other.

すなわち、接触部１７の側面１８から突起１９の先端部２０までの寸法である突起１９の突出厚さＬ２に比べて緩衝部材２１の突出厚さＬ１の方が大きく、緩衝部材２１は接触部１７の側面１８から略均一な寸法で回転方向に突出している。そして、緩衝部材２１は他方の端面２２が被打撃面より突出して位置するため、打撃時に突出部１３が緩衝部材２１と最初に衝突するものとなっており、緩衝部材２１との衝突時には回転駆動が緩衝部材２１からアンビル１５に伝達される。 That is, the protrusion thickness L1 of the buffer member 21 is larger than the protrusion thickness L2 of the protrusion 19 which is the dimension from the side surface 18 of the contact portion 17 to the tip end portion 20 of the protrusion 19. It protrudes from the side surface 18 in the rotational direction with a substantially uniform dimension. Since the buffer member 21 is positioned so that the other end surface 22 protrudes from the hit surface, the protruding portion 13 first collides with the buffer member 21 at the time of impact, and is driven to rotate at the time of collision with the buffer member 21. Is transmitted from the buffer member 21 to the anvil 15.

このように、突出部１３と緩衝部材２１を衝突させることで、緩衝部材２１が柔軟な部材で形成されているために、衝突時に回転方向の力によって発生する騒音を、剛性部材どうしを衝突させるものに比べて、低減することができる。そして、緩衝部材２１の突出厚さＬ１を略均一にして設けたことで、他方の端面２２の略全体に打撃面１４が接触して、緩衝部材２１を回転方向に略同じ割合で形状変形させることができる。そのため、緩衝部材２１を介して接触部１７に伝達された回転駆動が、軸方向に対して傾いて付与されることを抑制できて、アンビル１５回転時に軸芯のぶれが抑制されて、回転駆動を安定して伝達することができる。 In this way, by causing the protruding portion 13 and the buffer member 21 to collide, since the buffer member 21 is formed of a flexible member, noise generated by the force in the rotation direction at the time of collision causes the rigid members to collide with each other. It can be reduced compared to the one. And by providing the protrusion thickness L1 of the buffer member 21 to be substantially uniform, the striking surface 14 comes into contact with substantially the entire other end surface 22, and the buffer member 21 is deformed in the rotational direction at substantially the same rate. be able to. Therefore, the rotation drive transmitted to the contact portion 17 via the buffer member 21 can be prevented from being inclined with respect to the axial direction, and the shaft core can be prevented from being shaken when the anvil 15 is rotated. Can be transmitted stably.

また、打撃時に、駆動軸１０のトルクが大きくなる等で、突出部１３からアンビル１５に向けて一定値を越えた衝撃が与えられると、緩衝部材２１が突出部１３に押されて回転方向に圧縮されて、他方の端面２２が突起１９の被打撃面と面一になる。そして、緩衝部材２１を圧縮した突出部１３は、緩衝部材２１に接触した状態で、突起１９にも衝突して、突出部１３から突起１９を介してアンビル１５に回転駆動が伝達される。すなわち、一定値を越えた衝撃での打撃時には、剛性部材と柔軟な部材が衝突した後、剛性部材どうしが衝突して、回転駆動は突出部１３から緩衝部材２１と突起１９の両方を介してアンビル１５に伝達される。 Further, when an impact exceeding a certain value is applied from the protruding portion 13 toward the anvil 15 due to an increase in the torque of the drive shaft 10 at the time of impact, the buffer member 21 is pushed by the protruding portion 13 in the rotational direction. By being compressed, the other end surface 22 is flush with the hit surface of the protrusion 19. Then, the protruding portion 13 that compresses the buffer member 21 collides with the protrusion 19 while being in contact with the buffer member 21, and the rotational drive is transmitted from the protruding portion 13 to the anvil 15 through the protrusion 19. That is, at the time of impact with an impact exceeding a certain value, after the rigid member collides with the flexible member, the rigid members collide with each other, and the rotational drive is performed from both the cushioning member 21 and the protrusion 19 from the protrusion 13. It is transmitted to the anvil 15.

そして、この剛性部材どうしの衝突により、緩衝部材２１を介して回転駆動を伝達する場合に比べて、大きな回転駆動を安定して伝達し易くすることができると共に、大きな回転駆動に伴う大きな衝撃で緩衝部材２１が破損することを抑制できる。また、突出部１３が突起１９より先（衝突初期）に緩衝部材２１に接触するため、衝突初期から剛性部材どうしが衝突するものより、衝突初期の騒音を低減することができる。更に、突起１９と緩衝部材２１がラジアル方向に接しているため、突出部１３と突起１９の衝突時の騒音の一部を緩衝部材２１で吸収できて、剛性部材どうしの衝突によって発生した衝突中期及び終期の騒音も低減することができる。 The collision between the rigid members makes it possible to stably transmit a large rotational drive stably as compared with the case where the rotational drive is transmitted via the buffer member 21, and with a large impact due to the large rotational drive. It can control that buffer member 21 is damaged. Moreover, since the protrusion 13 contacts the buffer member 21 before the protrusion 19 (initial stage of the collision), noise at the initial stage of the collision can be reduced as compared with the case where the rigid members collide from the initial stage of the collision. Further, since the protrusion 19 and the buffer member 21 are in contact with each other in the radial direction, a part of the noise at the time of the collision between the protrusion 13 and the protrusion 19 can be absorbed by the buffer member 21, and the middle stage of the collision generated by the collision between the rigid members And the final noise can also be reduced.

なお、接触部１７は、緩衝部材２１を外周側に設けて突起１９を内周側に設けたり、ラジアル方向に緩衝部材２１、突起１９、緩衝部材２１の順に並べて設けて突起１９の外周側と内周側に夫々緩衝部材２１を配置したりして構成してもよい。ましてや、突起１９を側面１８を被打撃面として、側面１８の外周側あるいは内周側に凹所を形成すると共に、凹所に緩衝部材２１を配置して、騒音を低減可能なアンビル１５をコンパクトに構成してもよい。 The contact portion 17 is provided with the buffer member 21 on the outer peripheral side and the protrusion 19 on the inner peripheral side, or arranged in the radial direction in the order of the buffer member 21, the protrusion 19, and the buffer member 21. The buffer member 21 may be arranged on the inner peripheral side. In addition, the projection 19 has a side surface 18 as an impact surface, a recess is formed on the outer peripheral side or the inner peripheral side of the side surface 18, and a buffer member 21 is disposed in the recess to make the anvil 15 capable of reducing noise compact. You may comprise.

また、緩衝部材２１の変形例として、緩衝部材２１の突出厚さを不均一にしたり、一部の突出厚さを他の部位と異ならせたりして、打撃時の衝撃に応じて緩衝部材２１の形状変形の割合や突出部１３との接触面積を異ならせてもよい。 Further, as a modification of the buffer member 21, the buffer member 21 may have a non-uniform protrusion thickness, or a part of the protrusion thickness may be different from that of other parts. The shape deformation ratio and the contact area with the protrusion 13 may be varied.

このものとして、例えば、図５に示すように、緩衝部材２１の回転方向の突出厚さを外周に向けて漸次的に大きくすることで、駆動軸１０のトルク（打撃時の衝撃）の増減に応じて緩衝部材２１の衝突時の接触面積を変化させることができる。すなわち、打撃時の衝撃が大きくなると、緩衝部材２１の突出部１３との接触面積が大きくなり、衝撃が小さくなると、接触面積が小さくなり、衝撃の強さに応じて、緩衝部材２１と突出部１３の接触面積を変化させるものとなっている。 For example, as shown in FIG. 5, by gradually increasing the protrusion thickness in the rotational direction of the buffer member 21 toward the outer periphery, the torque of the drive shaft 10 (impact at impact) can be increased or decreased. Accordingly, the contact area at the time of collision of the buffer member 21 can be changed. That is, when the impact at the time of impact increases, the contact area of the buffer member 21 with the protrusion 13 increases, and when the impact decreases, the contact area decreases, and the buffer member 21 and the protrusion according to the strength of the impact. The contact area of 13 is changed.

そして、衝撃が小さい際には、接触面積が小さくなるため、突出部１３と緩衝部材２１の接触抵抗を小さく抑えることができる。そのため、緩衝部材２１に接触した状態の打撃後のハンマ１２が、アンビル１５を乗り越え易くなり、衝撃の小さい低トルク時における打撃動作の安定性を向上させることができる。更に、衝撃の大きい高トルク時には、接触面積が大きくなるため、緩衝部材２１が接触面全体に衝撃を分散して受けられ、高トルクに伴う大きな衝撃による緩衝部材２１の破損を抑制することができる。なお、緩衝部材２１の突出厚さが不均一なものは、内周に向けて漸次的に突出厚さが大きくなるものはもちろん、ラジアル方向の中央から内周及び外周に向かうほど漸次的に変化するもの等であってもよい。 And when an impact is small, since a contact area becomes small, the contact resistance of the protrusion part 13 and the buffer member 21 can be restrained small. Therefore, the hammer 12 after hitting in a state of being in contact with the buffer member 21 can easily get over the anvil 15, and the stability of the hitting operation at the time of low torque with a small impact can be improved. Further, when the impact is high and the torque is high, the contact area becomes large, so that the shock absorbing member 21 can receive the shock in a distributed manner over the entire contact surface, and the damage of the shock absorbing member 21 due to the large shock accompanying the high torque can be suppressed. . In addition, the thing with the nonuniform protrusion thickness of the buffer member 21 changes gradually as it goes to the inner periphery and the outer periphery from the center in the radial direction as well as the protrusion thickness gradually increasing toward the inner periphery. It may be a thing to do.

ましてや、緩衝部材２１は、均一な突出厚さの部位のラジアル方向の一端や中間等の一部に凸部や凹部を設けて、凸部や凹部を設けた部位の突出厚さを他の部位の突出厚さと異ならせて、衝撃に応じて衝突時の接触面積を変化させてもよい。もちろん、緩衝部材２１は、ラジアル方向の一端に凸部を有し他端に凹部を有した階段状に突出したもの等の突出厚さの異なる部位を複数有したものであってもよい。 In addition, the buffer member 21 is provided with a convex portion or a concave portion at one end in the radial direction of a portion having a uniform protruding thickness, a middle portion, etc. The contact area at the time of collision may be changed in accordance with the impact, different from the protruding thickness of. Of course, the buffer member 21 may have a plurality of portions with different projecting thicknesses such as a stepped projection having a convex portion at one end in the radial direction and a concave portion at the other end.

また、インパクト回転工具の他の実施形態の一例では、図６に示すように、被打撃面を有した剛性部材をアンビル１５と別部材で構成すると共に、この剛性部材を緩衝部材２１を介してアンビル１５に取り付けたものとなっている。なお、本例では、アンビル１５の構成を除く他の構成は、前述の実施形態で説明した構成と略同様の構成であるため、説明は省略する。 In an example of another embodiment of the impact rotary tool, as shown in FIG. 6, the rigid member having the hit surface is configured as a separate member from the anvil 15, and the rigid member is interposed via the buffer member 21. It is attached to the anvil 15. In addition, in this example, since the structure of those other than the structure of the anvil 15 is a structure substantially the same as the structure demonstrated in the above-mentioned embodiment, description is abbreviate | omitted.

詳しくは、接触部１７の各側面１８に夫々矩形状の緩衝部材２１が二つ配置されており、各側面１８の緩衝部材２１はラジアル方向に並ぶと共に、ラジアル方向で向かい合う面の間に伝達部材２６が取り付けられている。 Specifically, two buffer members 21 each having a rectangular shape are arranged on each side surface 18 of the contact portion 17, and the buffer members 21 on each side surface 18 are arranged in the radial direction and between the surfaces facing each other in the radial direction. 26 is attached.

伝達部材２６は円形状の端面を有した円柱であり、アンビル１５と略同様に、緩衝部材より剛性が高い剛性部材からなる。そして、伝達部材２６は柱の中心軸が接触部１７の側面１８に沿って配置されており、柱の端部が夫々緩衝部材２１に埋め込まれて、緩衝部材２１に保持されている。更に、伝達部材２６は緩衝部材２１の他方の端面２２より回転方向の内側（接触部１７の側面１８に近い側）にあり、伝達部材２６の周面は突出部１３に打撃される被打撃面となっており、緩衝部材２１が伝達部材２６より回転方向に突出している。 The transmission member 26 is a cylinder having a circular end surface, and is made of a rigid member having higher rigidity than that of the buffer member, substantially like the anvil 15. The transmission member 26 is arranged such that the center axis of the column is along the side surface 18 of the contact portion 17, and the end portions of the column are embedded in the buffer member 21 and held by the buffer member 21. Further, the transmission member 26 is located on the inner side in the rotational direction (the side closer to the side surface 18 of the contact portion 17) than the other end surface 22 of the buffer member 21, and the circumferential surface of the transmission member 26 is a hit surface hit by the protrusion 13. The buffer member 21 protrudes in the rotational direction from the transmission member 26.

そのため、小トルクでの打撃時には、突出部１３が伝達部材２６と衝突せずに緩衝部材２１のみと衝突し、回転駆動は緩衝部材２１からアンビル１５に伝達される。そして、小トルクより大きく高トルク（詳細は後述する）より小さい中トルクでの打撃時には、突出部１３が緩衝部材２１を回転方向に圧縮して伝達部材２６に衝突する。この中トルクでの打撃時には、回転駆動が伝達部材２６から緩衝部材２１を介してアンビル１５に伝達される。 Therefore, when hitting with a small torque, the projecting portion 13 does not collide with the transmission member 26 but collides only with the buffer member 21, and the rotational drive is transmitted from the buffer member 21 to the anvil 15. Then, when striking with a medium torque larger than a small torque and smaller than a high torque (details will be described later), the protrusion 13 compresses the buffer member 21 in the rotational direction and collides with the transmission member 26. At the time of hitting with this medium torque, the rotational drive is transmitted from the transmission member 26 to the anvil 15 via the buffer member 21.

更に、中トルクより大きい高トルクでの打撃時には、突出部１３が、伝達部材２６に衝突した後に、緩衝部材２１を回転方向に更に圧縮して、伝達部材２６の周面を接触部１７の側面１８に衝突させる。すなわち、高トルクでの打撃時には、伝達部材２６及び緩衝部材２１に接触した状態で、突出部１３が伝達部材２６を間に挟んで接触部１７を打撃して、突出部１３と接触部１７が伝達部材２６を介して剛性部材どうしで衝突する。 Further, at the time of hitting with a high torque larger than the medium torque, after the protruding portion 13 collides with the transmission member 26, the buffer member 21 is further compressed in the rotation direction, and the peripheral surface of the transmission member 26 is made to be the side surface of the contact portion 17. 18 to hit. That is, at the time of hitting with high torque, in a state where the transmission member 26 and the buffer member 21 are in contact, the projecting portion 13 strikes the contact portion 17 with the transmission member 26 interposed therebetween, and the projecting portion 13 and the contact portion 17 are The rigid members collide with each other via the transmission member 26.

このように、本例のものは、打撃時に突出部１３が緩衝部材２１と最初に衝突することで、突出部１３と緩衝部材２１の衝突時の騒音の発生を抑制できると共に、剛性部材どうしの衝突時の騒音を緩衝部材２１で吸収できる。そのため、打撃動作が剛性部材どうしの衝突しかない従来のものに比べて、打撃時の回転方向の力によって発生する騒音を低減することができる。そして、伝達部材２６を配置したことで、高トルクでの打撃時に、剛性部材どうしの衝突が可能となり、前述の突起１９を設けた例のように、大きな回転駆動を安定して伝達し易くできると共に、衝撃による緩衝部材２１の破損を抑制できる。 As described above, in this example, the protrusion 13 first collides with the buffer member 21 at the time of impact, so that it is possible to suppress the generation of noise at the time of the collision between the protrusion 13 and the buffer member 21 and Noise at the time of collision can be absorbed by the buffer member 21. Therefore, the noise generated by the force in the rotational direction at the time of striking can be reduced as compared with the conventional one in which the striking operation has only a collision between the rigid members. Since the transmission member 26 is arranged, the rigid members can collide with each other at the time of hitting with high torque, and a large rotational drive can be stably and easily transmitted as in the example in which the protrusion 19 is provided. At the same time, damage to the buffer member 21 due to impact can be suppressed.

更に、伝達部材２６を緩衝部材２１を介して取り付けたことで、接触部１７に衝突しない程度の衝撃（中トルク）で伝達部材２６が打撃された際には、剛性部材どうしを衝突させることができる。そのため、突出部１を緩衝部材２１のみに衝突させるものに比べて、緩衝部材２１に吸収される回転駆動を抑えられ、中トルクでの打撃における回転駆動の伝達損失を低減することができる。そして、緩衝部材２１のラジアル方向の間に伝達部材２６を配置したことで、剛性部材どうしの衝突に伴って発生する騒音を、緩衝部材２１で吸収し易くでき、打撃時の騒音を低減することができる。 Furthermore, by attaching the transmission member 26 via the buffer member 21, when the transmission member 26 is hit with an impact (medium torque) that does not collide with the contact portion 17, the rigid members can collide with each other. it can. Therefore, the rotational drive absorbed by the buffer member 21 can be suppressed and the transmission loss of the rotary drive in the middle torque can be reduced as compared with the case where the protruding portion 1 collides only with the buffer member 21. And by arranging the transmission member 26 in the radial direction of the buffer member 21, the noise generated due to the collision between the rigid members can be easily absorbed by the buffer member 21, and the noise at the time of impact is reduced. Can do.

なお、伝達部材２６の形状は、楕円形状の円柱や、矩形状の端面を有した角柱はもちろん、円形状や楕円形状や矩形状の板面を有し該板面を被打撃面とした板材、あるいは表面を被打撃面とした球等であってもよい。また、緩衝部材２１で被打撃面を覆うことで衝突時の騒音をより低減できるが、大きい回転駆動を伝達し易くするために、被打撃面の一部を回転方向に露出させて、ハンマ１２とアンビル１５が剛性部材どうしで衝突可能に構成することが好ましい。 Note that the shape of the transmission member 26 is not only an elliptical cylinder or a rectangular column having a rectangular end surface, but also a plate material having a circular, elliptical, or rectangular plate surface with the plate surface being a hit surface. Alternatively, it may be a sphere whose surface is a hit surface. Further, the impact surface can be further reduced by covering the hit surface with the buffer member 21, but in order to easily transmit a large rotational drive, a part of the hit surface is exposed in the rotation direction, and the hammer 12 is exposed. It is preferable that the anvil 15 is configured to be able to collide with the rigid members.

もちろん、インパクト回転工具は、回転駆動を出力する工具であれば、チャック２５と先端工具が一体で構成されたものや、出力軸２４の軸方向が回転軸７に略直交して配置されたコーナー用のもの等であってもよい。ましてや、打撃部９が打撃動作を行うインパクトモードと、打撃部９に打撃動作を行わせない非インパクトモードを切替可能で備えたものであってもよい。この非インパクトモードとは、ハンマ１２をアンビル１５に固定するあるいは駆動軸１０をアンビル１５や出力軸２４に固定する等で、駆動軸１０と出力軸２４を一体で回転させて、打撃部９に打撃動作を行わせずに回転駆動を伝達するモードである。 Of course, as long as the impact rotary tool is a tool that outputs rotational drive, the chuck 25 and the tip tool are integrally formed, or the corner in which the axial direction of the output shaft 24 is arranged substantially orthogonal to the rotary shaft 7. It may be for use. Furthermore, the impact mode in which the hitting unit 9 performs the hitting operation and the non-impact mode in which the hitting unit 9 does not perform the hitting operation may be switchable. This non-impact mode means that the hammer 12 is fixed to the anvil 15 or the drive shaft 10 is fixed to the anvil 15 or the output shaft 24. In this mode, the rotational drive is transmitted without performing the hitting operation.

５駆動部
６モータ
９打撃部
１２ハンマ
１５アンビル
１９突起
２１緩衝部材
２３出力部 DESCRIPTION OF SYMBOLS 5 Drive part 6 Motor 9 Stroke part 12 Hammer 15 Anvil 19 Protrusion 21 Buffer member 23 Output part

Claims

モータを有した駆動部と、前記駆動部の回転駆動を出力する出力部と、前記駆動部の回転駆動を打撃動作を伴って前記出力部に伝達する打撃部と、を有し、前記打撃部が、前記駆動部により回転するハンマと、前記ハンマに打撃される被打撃面を有すると共に前記出力部に回転駆動を伝達するアンビルと、前記アンビルに取り付けられると共に前記アンビルより剛性の低い緩衝部材と、からなり、前記緩衝部材が前記被打撃面より前記アンビルの回転方向に突出したものであることを特徴とするインパクト回転工具。 A driving unit having a motor; an output unit that outputs rotational driving of the driving unit; and a striking unit that transmits the rotational driving of the driving unit to the output unit with a striking operation. A hammer rotated by the drive unit, an anvil having a hitting surface to be struck by the hammer and transmitting rotational drive to the output unit, and a buffer member attached to the anvil and having a lower rigidity than the anvil. The impact rotary tool according to claim 1, wherein the buffer member protrudes from the hit surface in the rotation direction of the anvil.

前記緩衝部材が均一な厚さで回転方向に突出したものであることを特徴とする請求項１に記載のインパクト回転工具。 The impact rotary tool according to claim 1, wherein the buffer member protrudes in the rotation direction with a uniform thickness.

前記緩衝部材が不均一な厚さで回転方向に突出したものであることを特徴とする請求項１に記載のインパクト回転工具。 2. The impact rotary tool according to claim 1, wherein the buffer member protrudes in the rotation direction with a non-uniform thickness.

前記アンビルが回転方向に突出した突起を有し、前記突起が突出した先端に前記被打撃面を有したものであることを特徴とする請求項１〜３のいずれか一項に記載のインパクト回転工具。 The impact rotation according to any one of claims 1 to 3, wherein the anvil has a protrusion protruding in a rotation direction, and the hit surface is provided at a tip from which the protrusion protrudes. tool.

前記緩衝部材より剛性の高い剛性部材を有し、前記剛性部材が前記緩衝部材を介して前記アンビルに取り付けられたものであることを特徴とする請求項１〜４のいずれか一項に記載のインパクト回転工具。 It has a rigid member with higher rigidity than the said buffer member, The said rigid member is attached to the said anvil via the said buffer member, The Claim 1 characterized by the above-mentioned. Impact rotary tool.