CN101801611A - Impact tool - Google Patents
Impact tool Download PDFInfo
- Publication number
- CN101801611A CN101801611A CN200880106987A CN200880106987A CN101801611A CN 101801611 A CN101801611 A CN 101801611A CN 200880106987 A CN200880106987 A CN 200880106987A CN 200880106987 A CN200880106987 A CN 200880106987A CN 101801611 A CN101801611 A CN 101801611A
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- China
- Prior art keywords
- counterweight
- reaction force
- state
- actuating member
- hammering
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D17/00—Details of, or accessories for, portable power-driven percussive tools
- B25D17/24—Damping the reaction force
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D17/00—Details of, or accessories for, portable power-driven percussive tools
- B25D17/06—Hammer pistons; Anvils ; Guide-sleeves for pistons
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
- B25D2211/003—Crossed drill and motor spindles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2222/00—Materials of the tool or the workpiece
- B25D2222/21—Metals
- B25D2222/42—Steel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
- B25D2250/371—Use of springs
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Percussive Tools And Related Accessories (AREA)
Abstract
The present invention is provided in percussion tool by the improved technology of the absorbing structure of the caused impact force that rebounds of tool heads after percussion action. Percussion tool of the invention includes tool body (103); Hammering action component (119,145); Impulse member (143); Counterweight part (163), when hammering action component carries out hammering operation, effect of the counterweight part in reaction force transmitting position by the reaction force come from the transmitting of hammering action component, and the reaction force come using transmitting is from reaction force transmitting position to different from the long axis direction of hammering action component direction movements; Elastic component (165), being capable of flexible deformation. Counterweight part (163) is configured to its state and changes between the first state and a second state, first state is that reaction force is transferred to the state before counterweight part (163), and the second state is the state for making counterweight part (163) mobile to the direction different from the long axis direction of hammering action component by the transmitting of reaction force. In addition, elastic component (165) acts on loading force so that counterweight part (163) forms first state, when making counterweight part (163) change from first state to the second state using reaction force, elastic component by counterweight part (163) pressing and flexible deformation, be transferred to the reaction force of the counterweight part (163) to absorb.
Description
Technical field
The technology of the reaction force that affords from work piece when the present invention relates to be used to relax the hammering operation in a kind of percussion tool of the hammering operation of work piece being carried out linearity.
Background technology
In TOHKEMY 2007-50495 communique (patent documentation 1), the technology that is used to relax the impulsive force (reaction force) that is caused by rebounding of tool heads behind the percussion action in a kind of percussion tool is disclosed.The percussion tool of putting down in writing in the communique has: counterweight is in the state that connects with the impact bolt when the hammering operation; And impact absorption mechanism, by to constituting with the helical spring of the direction of impacting the bolt butt to this counterweight application of force.Impact absorption mechanism constitutes, tool heads rebounds when making rearward reaction force acts on impacting bolt after because of percussion action, utilization rearward moves counterweight from impacting the next reaction force of bolt transmission, by the mobile helical spring strain rearward that makes of this counterweight.
According to the impact absorption mechanism of putting down in writing in the above-mentioned communique, utilize that counterweight is rearward to be moved and because of the mobile helical spring strain that causes of this counterweight absorbs the impulsive force that is caused by rebounding of tool heads behind the percussion action, thereby can realize the low vibrationization of percussion tool.But also there is the further room for improvement of having constructed of impact power absorbing structure in the impact absorption mechanism of putting down in writing in the communique.
Patent documentation 1:JP spy opens the 2007-50495 communique.
Summary of the invention
The problem that invention will solve
The objective of the invention is to, the improved technology of absorbing structure of the impulsive force that is caused by rebounding of tool heads behind the percussion action in a kind of impact instrument is provided.
The means that are used to deal with problems
In order to reach the problems referred to above, the optimal technical scheme of percussion tool of the present invention constitutes, and this percussion tool has: tool body; The hammering actuating member is configured in the front end area of tool body and the hammering operation of work piece being stipulated by carrying out rectilinear motion along long axis direction; Impulse member carries out rectilinear motion by the long axis direction along the hammering actuating member, and percussion is put on the hammering actuating member.In addition, so-called " the hammering operation of regulation " refers to that not only the hammering actuating member only carries out the hammering operation of the percussion action of linearity among the present invention, also comprises the hammer drill operation of the percussion action that carries out linearity and circumferential spinning movement.In addition, among the present invention so-called " hammering actuating member ", typically saying so is equivalent to tool heads and with the impact bolt of the state transfer impulsive force that connects with this tool heads.
Percussion tool of the present invention has: counterweight portion, when the hammering actuating member carries out the hammering operation to work piece, reaction force during with the state of hammering actuating member butt transmits the position with the state of the direct butt of hammering actuating member or via the intermediary of hard metal system being in this counterweight portion, be subjected to effect from the next reaction force of hammering actuating member transmission, and the reaction force that utilizes this transmission moves to the direction different with the long axis direction of hammering actuating member and transmit the position from reaction force; And elastic component, can carry out strain.And, counterweight portion constitutes its state and changes between first state and second state, described first state is that reaction force is passed to this counterweight portion state before, described second state is the transmission by reaction force, the state that this counterweight portion is moved to the direction different with the long axis direction of hammering actuating member.On the other hand, elastic component effect loading force (elastic force pressure) is so that counterweight portion forms first state, utilizing reaction force to make counterweight portion from first state during to second state variation, this elastic component is subjected to pushing of counterweight portion and strain takes place, and is passed to the reaction force of this counterweight portion with absorption.In addition, among the present invention so-called " different directions ", not only refer to hammering actuating member for example radially or comprise the oblique rear of radial component, also comprise all directions beyond the long axis direction of hammering actuating member.In addition, so-called " elastic component " said typically to be equivalent to spring, but also can be suitable for rubber among the present invention.
When carrying out the hammering operation, the hammering actuating member is subjected to the effect of reaction force and rebounds from work piece behind percussion action.According to the present invention, the reaction force that bears from work piece about the hammering actuating member, can constitute and be in the state of the direct butt of this hammering actuating member or reaction force during via the state of the intermediary of hard metal system and this hammering actuating member butt transmits the position in counterweight portion, above-mentioned reaction force is passed to counterweight portion from the hammering actuating member, and roughly 100% ground transmits this reaction force thus.In other words, between hammering actuating member and counterweight portion, transmit reaction force,, counterweight portion is moved to the direction different with the long axis direction of hammering actuating member by the transmission of this reaction force in the mode of momentum-exchange.And, utilize this counterweight portion to make the elastic component strain absorb the reaction force to this direction of counterweight portion.Promptly, according to the present invention, utilize counterweight portion to the direction different with the long axis direction of hammering actuating member move and because of the elastic component strain that produces that moves of this counterweight portion, can absorb by being created in the reaction force that rebounding on the hammering actuating member causes, thus, can realize the low vibrationization of percussion tool.
According to the present invention, by the structure that formation makes counterweight portion move along promptly different with the impact direction direction of the long axis direction of hammering actuating member, can realize the miniaturization of impact absorption mechanism on hammering actuating member long axis direction that constitutes by counterweight portion and elastic component.
Another way according to percussion tool of the present invention, counterweight portion is by constituting along circumferential horizontal mutually at least two counterweights of configuration side by side in the hammering actuating member outside, each counterweight constitutes, when when the hammering actuating member transmits reaction force, utilize this reaction force, described each counterweight is moved to the direction that the long axis direction with the hammering actuating member intersects.In addition, so-called " crisscross " typically says the external diameter direction that is equivalent to the hammering actuating member among the present invention, comprehensively says to comprise external diameter direction part.Thereby " elastic component " among the present invention preferably is made of the leaf spring of C ring-type roughly, and this leaf spring is configured at least two counterweights outsides (periphery) and will puts on each counterweight to the loading force integral body of internal diameter direction.But elastic component can constitute the structure to each counterweight difference application of force.In addition, in the present invention, the mode that moves as the direction that counterweight is intersected to the long axis direction with the hammering actuating member typically can make counterweight portion directly or via intermediary and hammering member butt by the conical surface.
According to the present invention, can utilize the space in this hammering actuating member outside (outside diameter) to make the counterweight action that is configured in the hammering actuating member outside.Therefore, can make impact absorption mechanism in the further miniaturization of hammering actuating member long axis direction.
According to the another way again of percussion tool of the present invention, counterweight portion is made of the counterweight of a plurality of pearls (beads state) on the circumferential and long axis direction that is configured in the hammering actuating member.A plurality of counterweights constitute, be subjected to the application of force of elastic component, make a part of counterweight and hammering actuating member butt, and adjacent counterweight is contacted each other, and, when the reaction force from the hammering actuating member is passed to a part of counterweight, reaction force is that starting point is passed to the counterweight that is in contact with one another successively to receive a part of counterweight that transmits this reaction force that comes, each counterweight can be moved to direction at random, and move to the direction that makes the elastic component strain as counterweight integral body.In addition, so-called " counterweight of pearl " typically said to be equivalent to steel ball, but is not limited to sphere among the present invention, can comprise other shapes such as polyhedron, spindle widely.In addition, the deformation direction of so-called " elastic component " among the present invention typically is set at the long axis direction of hammering actuating member.
According to the present invention, by constituting counterweight portion, the reaction force that comes from the transmission of hammering actuating member can be distributed on each counterweight, and increase the loss of reaction force when adjacent counterweight transmits each other by a plurality of counterweights.Thus, the attenuating of reaction force can be improved, the reaction force on the elastic component can be reduced to act on.Its result can improve the durability of this elastic component.
The effect of invention
According to the present invention, can provide the improvement technology of the absorbing structure of the impulsive force that causes by rebounding of tool heads behind the percussion action in a kind of percussion tool.
The specific embodiment
(first embodiment of the present invention)
Below, explain first embodiment of the present invention with reference to Fig. 1～Fig. 4.Present embodiment uses DYN dynamic hammer drill to describe as an example of percussion tool.Fig. 1 is the integrally-built sectional view of the electrodynamic type hammer drill of expression present embodiment, shows hammer bit by the load condition that is pressed on the work piece.As shown in Figure 1, put it briefly, have as the main body of the hammer drill 101 of present embodiment: main part 103 forms the outline of hammer drill 101; Hammer bit 119 is installed in the front end area (diagram left side) of this main part 103 in the mode that can freely load and unload via cutter holder (tool holder) 137; Handle 109 is connected with the opposition side of the hammer bit 119 of main part 103, grips for the user.Main part 103 is corresponding to " tool body " of the present invention.Hammer bit 119 is retained as and can relatively moves back and forth along the long axis direction of cutter holder 137 by cutter holder 137, and to the circumferential state that is restricted that relatively rotates of cutter holder 137.Wherein, for convenience of explanation, before hammer bit 119 1 sides are called, after handle 109 1 sides are called.
In showing Fig. 2 of major part of the present invention, impact structure 115 constitutes main body with ram 143, and this ram 143 is configured in the hole inwall of cylinder 141 with piston 129 and can be free to slide.Ram 143 is corresponding to " impulse member " of the present invention.Ram 143 is driven by the air spring of the air chamber 141a of the cylinder 141 moving along with the sliding action of piston 129, and clash into (impact) to being configured in the cutter holder 137 as the impact bolt 145 of middleware with being free to slide, via this impact bolt 145 impulsive force is passed to hammer bit 119.Impact bolt 145 and hammer bit 119 corresponding to " hammering actuating member " of the present invention.Impacting bolt 145 has: large-diameter portion 145a, be formed on the long axis direction front side, and be entrenched in tight shape in the tube hole inner peripheral surface of cutter holder 137; The first minor diameter part 145b, be used for and the tube hole inner peripheral surface of cutter holder 137 between form the space of prescribed level; The second minor diameter part 145c, with play shape and align member 151 tablings narrated later, and the impact of bearing ram 143.In addition, between the first minor diameter part 145b and the second minor diameter part 145c, be formed with the diameter middle footpath portion 145d bigger than the diameter of this first minor diameter part 145b and the second minor diameter part 145c, and front face side and back side at the middle footpath 145d of portion have the conical surface respectively, in addition, between large-diameter portion 145a and middle minor diameter part 145b, be formed with conical surface 145e.In addition, the bearing surface that offsets of the rear end face with hammer bit 119 of large-diameter portion 145a forms the sphere of convex.
Hammer drill 101 has align member 151, this align member 151 is configured at the state that impacts between bolt 145 and the cylinder 141, the user main part 103 is applied pushing force forwards and make hammer bit 119 by being pressed on the work piece and form under the load condition shown in Figure 1, locate main part 103 with respect to work piece.Align member 151 with hammer bit 119 by rearward (piston 129 1 sides) when being pressed into, at this impact bolt 145 and between being at least with respect to the gear-box 107 rearward cylinders 141 that move under the state that is restricted, connect with impacting bolt 145 and cylinder 141 respectively, main part 103 is positioned with respect to work piece.Align member 151 is unit member that the back metal washer 157 by the preceding metal washer 155 of the rubber ring 153 of the rubber system that forms ring-type, the hard that engages with the long axis direction front face side of this rubber ring 153, the hard that engages with the long axis direction back side of rubber ring 153 constitutes, and with play shape and the second minor diameter part 145c tabling that impacts bolt 145.
For when work piece is carried out the hammering operation, absorb the impulsive force (reaction force) of rebounding and producing by hammer bit behind the percussion action 119, the hammer drill 101 of present embodiment has on the hammer bit long axis direction: counterweight portion 163 connects with impact bolt 145; Leaf spring 165, the effect loading force so that this counterweight portion 163 with impact bolt 145 butts, and can transmit reaction force from this impact bolt 145.Counterweight portion 163 is corresponding to " counterweight portion " of the present invention, and leaf spring 165 is corresponding to " elastic component " of the present invention.Constitute impact absorption mechanism 161 by above-mentioned counterweight portion 163 and leaf spring 1654, this impact absorption mechanism 161 is configured in the outside of the first minor diameter part 145b that impacts bolt 145.
In addition, the long axis direction end face of each counterweight 163a, 163b all forms the conical surface, the awl end face of front side connects with the conical surface 145e that impacts bolt 145, and the awl end face of rear side connects with the front side conical surface of surface contact state with the middle footpath 145d of portion that impacts bolt 145 via rubber ring 164.Like this, two counterweight 163a, 163b be in bear by leaf spring 165 apply to the state of the loading force of internal diameter direction and by each end face butt of long axis direction to the state that impacts on the bolt 145, promptly be in the original state that can transmit reaction force.Original state is corresponding to " first state " of the present invention.The position that the conical surface 145e of the anterior end surface of each counterweight 163a, 163b and impact bolt 145 connects is corresponding to " reaction force transmission position " of the present invention.In addition, rubber ring 164 is set to the viscoplasticity member, when transmitting reaction force, counterweight portion 163 is used to absorb to impacting the stress wave that bolt 145 transmits from impacting bolt 145 with box lunch from counterweight portion 163, on the other hand, when percussion action, be used to absorb from impacting the stress wave that bolt 145 transmits to counterweight portion 163.
Below, the effect of above-mentioned such hammer drill that constitutes 101 is described.Operate the trigger 109c that is installed on the handle 109 when pulling, when energising drove CD-ROM drive motor 111, the rotation output by CD-ROM drive motor 111 made the piston 129 of the crank mechanism that constitutes movement conversion mechanism 113 carry out sliding action with linearity in cylinder 141.The effect of the air spring by the sliding action that is accompanied by piston 129 in the moving cylinder 141, ram 143 are carried out rectilinear motion and are clashed into (impacts) to impact bolt 145 in cylinder 141, the kinetic energy with ram 143 is passed to hammer bit 119 thus.On the other hand, the rotation of CD-ROM drive motor 111 output is passed to cutter holder 137 via the gear reduction that constitutes Poewr transmission mechanism 117.Thus, make cutter holder 137 and the hammer bit 119 that kept by this cutter holder 137 rotates integratedly.Like this, hammer bit 119 carries out the percussion action of long axis direction and circumferential spinning movement, and work piece is carried out the hammer drill operation.
So, above-mentioned operation be at hammer bit 119 by being pressed on the work piece, and carry out under the state that hammer bit 119 and cutter holder 137 rearward are pressed into.This state has been shown in Fig. 1 and Fig. 2.By cutter holder 137 rearward being pressed into, impact that bolt 145 is pressed rearward and via the leading section butt of align member 151 with cylinder 141 and make.That is,, main part 103 is positioned with respect to work piece, under this state, has implemented the hammer drill operation as the power that is pressed into that the cylinder 141 of main part 103 side members bears hammer bit 119.
Then, after 119 pairs of work pieces of hammer bit carried out percussion action, this hammer bit 119 was subjected to rebounding from the reaction force of work piece.Rebound the rearward reaction force of impact bolt 145 effects by this.At this moment, the conical surface 145e butt of counterweight 163a, the 163b of counterweight portion 163 and impact bolt 145.Therefore, the reaction force of impact bolt 145 is passed to counterweight portion 163.In other words, momentum exchanges between impact bolt 145 and counterweight portion 163.Transmission by such reaction force, impact bolt 145 is in roughly is still in the state that reaction force transmits the position, on the other hand, two of counterweight portion 163 counterweight 163a, 163b move to external diameter direction (outside) from Fig. 2 and original state shown in Figure 3.Promptly, because two counterweight 163a, 163b are connected to via the conical surface that tilts with respect to long axis direction that impacts bolt 145 impact on the bolt 145, two counterweight 163a, 163b are moved to external diameter direction (outside) so be passed to the radial component of the reaction force of this counterweight 163a, 163b.Counterweight 163a, 163b to the mobile status of external diameter direction corresponding to " second state " of the present invention.And the counterweight 163a, the 163b that move to the external diameter direction make leaf spring 165 strains for to expand to the external diameter direction.This state has been shown among Fig. 4.
In the present embodiment, utilized the characteristic of the stress wave that dome shape propagates, the moving direction that makes counterweight portion 163 is for radially.Promptly, because of backward reaction force of the front end effect of the impact bolt 145 that rebounds of hammer bit 119 time, occur in the stress wave that impacts on the bolt 145 as starting point with the butt position (axle center) that offsets with hammer bit 119 after bolt inside rearward is dome shape ground and propagates, be passed to via the conical surface and be connected to counterweight 163a, 163b on the conical surface 145e that tilts with respect to long axis direction that impacts bolt 145.By propagating stress wave via the conical surface like this, can propagate stress wave reposefully, and counterweight 163a, 163b be moved efficiently to the external diameter direction by the radial component of this stress wave that is transmitted.
Like this, utilize the strain that move and because of the moving of this counterweight portion 163 leaf spring 165 produced of counterweight portion 163 to the external diameter direction, the reaction force that rebounds and cause that produces by hammer bit 119 and impact bolt 145 can be absorbed efficiently, thereby the low vibrationization of hammer drill 101 can be realized.
In addition, when above-mentioned reaction force transmitted, the reaction force that impacts bolt 145 was passed to counterweight portion 163 through the conical surface, and this counterweight portion 163 is subjected to the effect of the long axis direction component of reaction force backward thereupon.But this reaction force backward is absorbed by the deflection of rubber ring 164.That is, rubber ring 164 can suppress to be passed to and to impact bolt 145 from impacting reaction force that bolt 145 is passed to counterweight portion 163.
According to present embodiment, two counterweight 163a, 163b by the folding tubular constitute counterweight portion 163, and the leaf spring 165 by the roughly C type ring-type on the outer peripheral face that is entrenched in two counterweight 163a, 163b applies loading force to internal diameter direction (inboard), constitutes impact absorption mechanism 161 thus.That is, the structure that the direction of action that makes impact absorption mechanism 161 by formation is done in the enterprising action of external diameter direction that intersects with the hammer bit long axis direction can make this impact absorption mechanism 161 miniaturization on the hammer bit long axis direction.
In addition, constitute in the present embodiment, impact bolt 145 and be provided with diameter, dispose impact absorption mechanism 161 in the outside of this centre second minor diameter part 145b than the second minor diameter part 145b littler with the front end area (large-diameter portion 145a) of hammer bit 119 butts.Therefore, the radial dimension that need not to enlarge cutter holder 137 just can dispose impact absorption mechanism 161.
(second embodiment of the present invention)
Below, with reference to Fig. 5 and Fig. 6 second embodiment of the present invention is described.Second embodiment is the variation about impact absorption mechanism 161, and except this point, other structures are identical with aforesaid first embodiment.As shown in Figure 5, have as the main body of the impact absorption mechanism 161 of present embodiment: counterweight portion 173 is made of a plurality of steel ball 173a of hard metal system; Casing 174 is used for ccontaining steel ball 173a; Helical spring 175, the effect loading force promptly forms original state so that casing 174 interior adjacent steel ball 173a are in contact with one another (butt) and form the state that can transmit reaction force.A plurality of steel ball 173a are corresponding to " counterweights of a plurality of pearls " of the present invention, and counterweight portion 173 is corresponding to " counterweight portion " of the present invention.In addition, helical spring 175 is corresponding to " elastic component " of the present invention, and original state is corresponding to " first state " of the present invention in addition.
Above-mentioned such casing that constitutes 174 is configured in the annulus between cylinder 141 and the cutter holder 137.And it is adjacent to be contained in steel ball 173a in the accommodation space of the casing 174 front openings portion and the rear end face of the preceding metal washer 155 of align member 151 by accommodation space.That is, preceding metal washer 155 is another members that constitute align member 151, and its external diameter forms the external diameter greater than rubber ring 153 and back metal washer 157, in its protruding zone, connects with several steel ball 173a of the front openings portion that is positioned at accommodation space.On the other hand, dispose the cover plate 177 of hard metal system in the rear openings portion of accommodation space.Cover plate 177 is as being used for the mobile intermediate member that is passed to helical spring 175 along the hammer bit long axis direction with steel ball 173a, be entrenched in this casing 174 in the mode that can relatively move on the long axis direction (hammer bit long axis direction) of casing 174, the inner surface of cover plate 177 (front surface) connects with the several steel ball 173a that are positioned at rear openings portion.
In the space between cylinder 141 and cutter holder 137, helical spring 175 is under the state of the initial load of being stipulated, between cover plate 177 and cutter holder 137 and be confined state.That is, helical spring 175 is configured in the rear position of casing 174, and an end (rear end) of its long axis direction connects with the spring backing ring 179 that is fixed on the cutter holder 137, and the other end of its long axis direction (front end) connects with cover plate 177.Thus, helical spring 175 forces on a plurality of steel ball 173a in the casing 174 via cover plate 177 with initial load, keeping adjacent steel ball 173a state against each other, and the steel ball 173a that is positioned at front openings portion is connected with the conical surface 145e that impacts bolt 145 via the preceding metal washer 155 of align member 151.Like this, steel ball 173a is in the original state that can transmit reaction force.Steel ball 173a via preceding metal washer 155 and the position of impacting bolt 145 butts corresponding to " reaction force transmission position " of the present invention.
Constitute the hammer drill 101 of present embodiment as described above.The hammer drill operation that utilizes hammer drill 101 is carried out under by the state that is pressed on the work piece at hammer bit 119.Rearward be pressed into by cutter holder 137, and will impact bolt 145 to push rearward and with preceding metal washer 155 butts of align member 151, and the leading section butt of back metal washer 157 and cylinder 141.That is, be subjected to the effect of the power that is pressed into of hammer bit 119, main part 103 is positioned with respect to work piece, under this state, implemented the hammer drill operation as the cylinder 141 of main part 103 side members.At this moment, as mentioned above, the rear surface that is positioned at the preceding metal washer 155 of the steel ball 173a of casing 174 front sides and align member 151 connects.Figure 5 illustrates this state.
Under this state,, when because of reaction force this hammer bit 119 being rebounded, rebound the rearward reaction force of impact bolt 145 effects when utilizing 119 pairs of work pieces of hammer bit to carry out percussion action by this from work piece thereupon.At this moment, because the steel ball 173a of counterweight portion 173 is passed to steel ball 173a so impact the reaction force of bolt 145 via this preceding metal washer 155 via the preceding metal washer 155 and impact bolt 145 butts of align member 151.Transmission by this reaction force is created in the spread state of the stress wave on the steel ball 173a shown in the ideograph of Fig. 6.Shown in (I) among Fig. 6, be passed to steel ball A by reaction force the past metal washer 155, and the abutment (illustrated stain) that is created in the former metal washer 155 of stress wave (reference circle camber line) on this steel ball A is that starting point is after propagate with dome shape steel ball inside, be transmitted to respectively adjacent steel ball B and the C that connect with this steel ball A, be transmitted to respectively the steel ball D that connects with steel ball B and C equally.By propagating stress wave so successively, each steel ball A～D is moved to stress direction of wave travel (direction of arrow).This state is shown in (II) among Fig. 6.
That is,, when from impacting bolt 145 sides when reaction force being passed to steel ball 173a casing 174 in, steel ball 173a in the casing 174 is moved in this casing 174 at random direction according to present embodiment, and rearward mobile as steel ball integral body.And the mobile cover plate 177 that makes of such steel ball 173a rearward moves, and thus, pushes helical spring 175 by this cover plate that moves 177 and makes its strain.The moving direction at random of steel ball 173a is corresponding to " different directions " of the present invention, steel ball 173a to the mobile status of random direction corresponding to " second state " of the present invention.
Like this, utilization be contained in the casing 174 a plurality of steel ball 173a to random direction move and helical spring 175 moves and rearward strain based on this, can absorb efficiently by resulting from hammer bit 119 and impact the reaction force that rebounds and cause on the bolt 145, thereby can realize the low vibrationization of hammer drill 101.
According to present embodiment, by using a plurality of steel ball 173a to constitute counterweight portion 163, increased the loss when propagating reaction force (stress wave) between the adjacent steel ball 173a, thereby improved attenuating, and because stress wave propagates to a plurality of directions randomly, so reduced to be applied to reaction force on the helical spring 175 between a plurality of steel ball 173a.Its result can prolong life-span of helical spring 175.In addition, along with the reaction force that is applied on the helical spring 175 diminishes, the elastic deformation amount also diminishes, and can correspondingly shorten the hammer bit long axis direction length of helical spring 175 thus, thereby realizes miniaturization.
In addition, above-mentioned embodiment is that example is illustrated with hammer drill 101 as percussion tool, but is not limited to hammer drill 101, also can be applicable to hammer certainly.In addition, in the above-described embodiment, reaction force is passed to the mode of counterweight portion 163,171 to the bang path formation of counterweight portion 163,171 from impacting bolt 145, but can change to the mode that is passed to counterweight portion 163,171 from hammer bit 119.
In addition, in the above-described embodiment, illustrated and used crank mechanism as the situation that the rotation output of CD-ROM drive motor 111 is converted to straight-line movement conversion mechanism 113 for linearity ground drives hammer bit 119, but be not limited to crank mechanism, for example can use the movement conversion mechanism that has utilized the swash plate of swinging vertically (swash plate).
Description of drawings
Fig. 1 is the integrally-built sectional view of the electrodynamic type hammer drill of expression first embodiment of the invention, shows hammer bit by the load condition that is pressed on the work piece.
Fig. 2 is the cutaway view of expression major part of the present invention.
Fig. 3 is the A-A line cutaway view among Fig. 2, shows the preceding state of impact absorption mechanism action.
Fig. 4 is the A-A line cutaway view among Fig. 2, shows the operating state of impact absorption mechanism.
Fig. 5 is the cutaway view of the impact absorption mechanism of expression second embodiment of the invention.
Fig. 6 illustrates the ideograph of the propagation of stress wave between a plurality of steel balls.
The explanation of Reference numeral
101 hammer drills (percussion tool)
103 main parts (tool body)
105 motor shells
107 gear-boxes
109 handles
The 109a turning cylinder
The 109b elastomeric spring
The 109c trigger
111 CD-ROM drive motors
113 movement conversion mechanisms
115 impact structures
117 Poewr transmission mechanisms
119 hammer bits (hammering actuating member)
129 pistons
137 cutter holders
141 cylinders
The 141a air chamber
143 rams (impulse member)
145 impact bolt (hammering actuating member)
The 145a large-diameter portion
145b first minor diameter part
145c second minor diameter part
Footpath portion among the 145d
The 145e conical surface
151 align members
153 rubber rings
Metal washer (intermediary) before 155
157 back metal washers
161 impact absorption mechanisms
163 counterweight portions
The 163a counterweight
164 rubber rings
165 leaf springs (elastic component)
173 counterweight portions
173a steel ball (counterweight of pearl)
174 casings
175 helical springs (elastic component)
177 cover plates
179 spring backing rings
Claims (4)
1. a percussion tool is characterized in that,
Have:
Tool body;
The hammering actuating member is configured in the front end area of described tool body and the hammering operation of work piece being stipulated by carrying out rectilinear motion along long axis direction;
Impulse member carries out rectilinear motion by the long axis direction along described hammering actuating member, and percussion is put on this hammering actuating member;
Counterweight portion, when described hammering actuating member carries out the hammering operation to described work piece, this counterweight portion is being in the state of the direct butt of described hammering actuating member or reaction force during via the state of the intermediary of hard metal system and described hammering actuating member butt transmits the position, be subjected to effect from the next reaction force of described hammering actuating member transmission, and the reaction force that utilizes this transmission moves to the direction different with the long axis direction of described hammering actuating member and transmit the position from described reaction force;
Elastic component can carry out strain;
Described counterweight portion constitutes its state is changed between first state and second state, described first state is that described reaction force is passed to described counterweight portion state before, described second state state that described counterweight portion moves to the direction different with the long axis direction of described hammering actuating member for the transmission by described reaction force makes
Described elastic component effect loading force is so that described counterweight portion forms described first state, utilizing described reaction force to make described counterweight portion from described first state during to described second state variation, described elastic component is subjected to pushing of described counterweight portion and strain takes place, and is passed to the reaction force of this counterweight portion with absorption.
2. percussion tool as claimed in claim 1 is characterized in that,
Described counterweight portion by in the outside of described hammering actuating member along circumferentially mutually laterally side by side at least two counterweights of configuration constitute,
Each counterweight constitutes, and when when described hammering actuating member transmits reaction force, utilizes this reaction force, and each counterweight is moved to the direction that the long axis direction with described hammering actuating member intersects.
3. percussion tool as claimed in claim 2 is characterized in that,
Described elastic component is by the outside that is configured in described at least two counterweights, and constitutes to the leaf spring of internal diameter direction to each above-mentioned counterweight application of force.
4. percussion tool as claimed in claim 1 is characterized in that,
Described counterweight portion by be configured in described hammering actuating member circumferentially and the counterweight of a plurality of pearls on the long axis direction constitute,
A plurality of counterweights constitute, be subjected to the application of force of described elastic component, make a part of counterweight and described hammering actuating member butt, and adjacent counterweight is contacted each other, when the reaction force from described hammering actuating member is passed to described a part of counterweight, reaction force is that starting point is passed on the counterweight that is in contact with one another successively to receive a part of counterweight that transmits this reaction force that comes, each counterweight can be moved to direction at random, and can move to the direction that makes described elastic component strain as counterweight integral body.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007237990A JP5100272B2 (en) | 2007-09-13 | 2007-09-13 | Impact tool |
| JP2007-237990 | 2007-09-13 | ||
| PCT/JP2008/066561 WO2009035090A1 (en) | 2007-09-13 | 2008-09-12 | Impact tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101801611A true CN101801611A (en) | 2010-08-11 |
| CN101801611B CN101801611B (en) | 2012-09-19 |
Family
ID=40452096
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008801069878A Expired - Fee Related CN101801611B (en) | 2007-09-13 | 2008-09-12 | Impact tool |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2199031B1 (en) |
| JP (1) | JP5100272B2 (en) |
| CN (1) | CN101801611B (en) |
| WO (1) | WO2009035090A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103386669A (en) * | 2012-05-07 | 2013-11-13 | 苏州宝时得电动工具有限公司 | Electric hammer |
| CN103786136A (en) * | 2012-10-17 | 2014-05-14 | 罗伯特·博世有限公司 | Hand-held machine tool device |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010030026A1 (en) * | 2010-06-14 | 2012-02-23 | Robert Bosch Gmbh | striking mechanism |
| JP5518617B2 (en) * | 2010-08-02 | 2014-06-11 | 株式会社マキタ | Impact tool |
| EP3822030A1 (en) * | 2019-11-15 | 2021-05-19 | Hilti Aktiengesellschaft | Drill and/or chisel hammer with impact device assembly |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE8102430L (en) * | 1981-04-15 | 1982-10-16 | Atlas Copco Ab | PROCEDURE AND DEVICE FOR DUMPING STOTVAGOR |
| JP3556714B2 (en) * | 1994-11-14 | 2004-08-25 | 株式会社マキタ | Immersion prevention device for impact tools |
| DE19933972A1 (en) * | 1999-07-20 | 2001-01-25 | Bosch Gmbh Robert | Hammer drill or hammer |
| JP2003175477A (en) * | 2001-12-12 | 2003-06-24 | Ryobi Ltd | Device for moderating impact in impact tool |
| JP4525904B2 (en) * | 2004-06-08 | 2010-08-18 | 日立工機株式会社 | Impact tool |
| US7383895B2 (en) * | 2005-08-19 | 2008-06-10 | Makita Corporation | Impact power tool |
| JP4509890B2 (en) * | 2005-08-19 | 2010-07-21 | 株式会社マキタ | Impact type work tool |
-
2007
- 2007-09-13 JP JP2007237990A patent/JP5100272B2/en not_active Expired - Fee Related
-
2008
- 2008-09-12 EP EP08830366A patent/EP2199031B1/en not_active Not-in-force
- 2008-09-12 CN CN2008801069878A patent/CN101801611B/en not_active Expired - Fee Related
- 2008-09-12 WO PCT/JP2008/066561 patent/WO2009035090A1/en active Application Filing
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103386669A (en) * | 2012-05-07 | 2013-11-13 | 苏州宝时得电动工具有限公司 | Electric hammer |
| CN103386669B (en) * | 2012-05-07 | 2016-03-16 | 苏州宝时得电动工具有限公司 | Electric hammer |
| CN103786136A (en) * | 2012-10-17 | 2014-05-14 | 罗伯特·博世有限公司 | Hand-held machine tool device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101801611B (en) | 2012-09-19 |
| WO2009035090A1 (en) | 2009-03-19 |
| JP2009066710A (en) | 2009-04-02 |
| JP5100272B2 (en) | 2012-12-19 |
| EP2199031A1 (en) | 2010-06-23 |
| EP2199031B1 (en) | 2013-01-02 |
| EP2199031A4 (en) | 2011-11-30 |
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