CN101228008A

CN101228008A - Percussion mechanism and at least percussively-operated hand machine tool with a percussion mechanism

Info

Publication number: CN101228008A
Application number: CNA2006800270837A
Authority: CN
Inventors: A·迪塞尔贝格; A·乌尔里希; K·西贝尔
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2005-07-27
Filing date: 2006-06-22
Publication date: 2008-07-23
Also published as: DE502006008238D1; ES2354626T3; US20080245220A1; WO2007012527A1; EP1910039B1; EP1910039A1; DE102005035099A1; ATE486695T1

Abstract

The invention relates to a percussion mechanism for an at least percussively-operated hand machine tool, in particular a hammer drill or chisel, comprising a drive motor and a tool holder (10) for housing a tool, with a percussive pin (12) acting on the tool which is axially displaceable within a percussive pin guide (11). The percussive pin guide (11) has a body (13) enclosing the percussive pin (12). According to the invention, the body (13) is made from two materials of differing hardness. The invention further relates to an at least percussively-operated hand machine tool, in particular a hammer drill or chisel with a percussion mechanism.

Description

Percussion mechanism and have percussion mechanism, can be impacted the hand held power machine that ground drives at least

Technical field

The present invention relates to a kind of percussion mechanism as described in the preamble and a kind of hand held power machine that can be impacted the ground driving at least that has percussion mechanism by independent claims.

Background technology

According to prior art, the hand held power machine that can the impact driving for example percussion mechanism of hammer drill and/or jump bit often comprises a so-called tup or impulse pin in order to transmit shock pulse, this tup or impulse pin can be bearing in the impulse pin guider with moving axially and driving side by the block stamp of percussion mechanism along boring-or impact direction apply impact.The impact energy of this impact is delivered on the driving side end of the cutter that is received in the tool mounting by impulse pin.Therefore, this one of hand held power machine inner space of with lubricator filling can impacting driving is to external seal.The impulse pin that is formed from steel mostly is directed in driving side is connected to hammer pipe on the tool mounting, that be formed from steel fiercely at tool mounting or at one.This solution is made of very many details, and it is made and requires accurate processing.Do not allow minimal tolerance that surpass to determine during the contact-making surface of especially impulse pin and tool mounting or hammer pipe, so that make member remain in the truncation Line and guarantee little cross force thus in processing.Thereby the solution of the suggestion that is formed from steel is very expensive.

Advised a kind of impulse pin guider of being made by elastomeric material in open file DE 103 23 606 A1, impulse pin flexibly is directed in this impulse pin guider.At this, this impulse pin guider single type or multi-piece type ground constitute.By adopting elastomeric material, though a kind of solution of cheapness is provided, at this disadvantageously, the reflection characteristic of elastomeric material is different from the reflection characteristic of steel, this has adverse effect for the dry running function, and this dry running function is no problem in steel solution so far.In addition, when using in the higher machine of quality, the expected life-span is less, and this has adverse effect again for cost factor.

Summary of the invention

At percussion mechanism of the present invention, that be used for being impacted at least the hand held power machine that ground drives, the impulse pin guider comprise one surround impulse pin, cross section is the main body of annular, this main body is made of at least two kinds of materials with different hardness.A kind ofly can be impacted hand held power machine, for example hammer drill and/or the jump bit that ground drives at least by the present invention and be comprised a percussion mechanism that correspondingly constitutes.At this, the driving side of preferred main body part is made of elastomer, and the cutter side of main body part is made of steel.At this advantageously, by in the cutter side part of main body, adopting steel to replace elastomeric material, can realize that percussion mechanism is by the obviously better transition of impact function to the dry running function.In addition, the member of being advised has the higher life-span with respect to pure elastomer solution., compare with the solution that is made of elastomer fully, the solution of being advised reaches tangible cost advantage when improving function for this reason.Replace material that elastomer also can adopt other, for example plastics etc.

In solution of the present invention, be configured with driving side part that make by elastomeric material, main body and cutter side part that be formed from steel, main body the main body two-piece type.Preferred these two parts have one and are used for axial forming part impulse pin, continuous, wherein impulse pin can be between dry running position and impact position in this dead slot the limited earth's axis to moving.Suitable is that the part that the quilt of main body is shaped like this has the guide function that is used for impulse pin.Especially the cutter side of main body partly has the dry running impact backstop convex shoulder of an inside, and impulse pin impacts on the backstop convex shoulder by touching at this dry running when dry running.The driving side part of main body preferably has a B and impacts the backstop convex shoulder, and this B impacts the recoil of backstop convex shoulder damping impulse pin after shock pulse is passed on the instrument.By structure, impacting the braking of this impulse pin of damping when impulse pin moves in service backwards by the driving side part of making by elastomer of of the present invention, main body.

In a form of implementation of the present invention, a potted component is arranged on the driving side interior and/or outer peripheral face partly of main body.Therefore advantageously realize better sealing effectiveness, prevent that especially dirt from entering from the outside.Preferred potted component surrounds impulse pin circlewise.

The driving side part of main body is shaped like this, make it except the guiding impulse pin, also satisfy one or more other functions, for example at dry running-or sealing function and/or the vibration-damping function of B in impacting, so that damping is in the recoil of this generation and support drill bit in the machine.In order to satisfy other additional function, a block stamp acquisition loop is integrated in the driving side part of main body, so that catch block stamp in dry running.Satisfy driving side part a plurality of functions, that be shaped like this in the time of by main body, providing of independent member can advantageously be provided.

In a form of implementation that substitutes, an independent block stamp acquisition loop is set replaces the interior block stamp acquisition loop of driving side part that is integrated into main body.For example adopt the sealing ring of standard, this causes the simplification of cutter structure for this reason.

Can consider that the cutter sidepiece proportion by subtraction driving side part of main body constitutes more longways.Alternatively, the cutter side of main body part also can constitute conversely with the length ratio of driving side part, and wherein the driving side of main body part constitutes more longways than cutter side part.Different situations according to Machinery Design can obtain deformation programs different, how much thus.

Description of drawings

Of the present invention other form of implementation, aspect and advantage and its combination in the claims irrespectively, under the situation that does not limit generality, obtain from the following embodiments of the invention of describing by means of accompanying drawing.

Illustrate below:

Fig. 1 illustrates the partial longitudinal section of the hand held power machine that can be impacted the ground driving at least with impulse pin group,

Fig. 2 a, b illustrate the driving side part of impulse pin guider, and (Fig. 2 a) and the view of the amplification of cutter side part (Fig. 2 b).

The specific embodiment

In Fig. 1, the electric hand drill with percussion mechanism or the part of jump bit are shown with the form of longitudinal section.Percussion mechanism consist essentially of an impulse pin guider 11 and one can be in impulse pin guider 11 axially movable impulse pin 12, this impulse pin 12 will be delivered to by the shock pulse of the block stamp 20 of the percussion mechanism of a unshowned drive motor of hand-held hammer drill or jump bit one be installed to equally boring in the tool mounting 10-or impact tool 19 on.

Impulse pin 12 make by solid steel and by columniform end sections 21a, the 21b of two lengthwises and one connect these two

end sections

21a, 21b's and the radially mid portion 22 of thickening that is arranged between them constitute.

Impulse pin guider 11 extends on the whole length of impulse pin 12 and comprises a hammer pipe 23, and this hammer pipe in axial direction is bearing in the housing 24 of hammer drill or jump bit.A main body 13 is fixed in the hammer pipe 23.Hammer pipe 23 by two pipeline sections 23 that connect by the annular convex shoulder 32 of a taper ', 23 " constituting the pipeline sections 23 wherein front, the cutter side " have less diameter and constitute tool mounting 10.The pipeline section 23 at rear portion ' have bigger diameter and opening wide in the portion in its back-end makes a piston 25 that acts on the block stamp 20 of described main body 13, impulse pin 12, block stamp 20 and percussion mechanism to be imported in the hammer pipe 23 by this side.Between piston 25 and block stamp 20, in hammer pipe 23, be configured with an air chamber 26, this air chamber can be by the airport (not shown) ventilation radially on the wall of hammer pipe 23.

The main body 13 that is kept by hammer pipe 23 constitutes circlewise on cross section and is made of two kinds of materials with different hardness.Main body 13 two parts ground constitute, and have a driving side part 14 and a cutter side part 15.The driving side part 14 of main body 13 is made of a kind of elastomer, and the cutter side part 15 of main body 13 is made of steel.The driving side part 14 of main body 13 has than cutter side part 15 bigger axial length extends.

These two

parts

14,15 have one and are used for axial dead slot 27 impulse pin 12, continuous.Driving side part 14 has a B at driving side and impacts backstop convex shoulder 17, the recoil of its this impulse pin 12 of damping after impulse pin 12 is delivered to shock pulse on the cutter 19.The cutter side part 15 of main body 13 is impacted backstop convex shoulder 16 at the dry running that the cutter side has an inside, and impulse pin 12 abuts on this dry running impact backstop convex shoulder when dry running.Therefore impulse pin 12 can the limited earth's axis between dry running position and impact position in the dead slot 27 that constitutes by described

part

14,15 to mobile.Thereby described

part

14,15 is as the guider of impulse pin 12.

At the detailed view of the driving side part 14 that has the main body 13 that B impacts backstop convex shoulder 17 shown in Fig. 2 a and at the detailed view of the cutter side part 15 that has the main body 13 that dry running impacts backstop convex shoulder 16 shown in Fig. 2 b.Described

part

14,15 is formed with a dead slot 27 respectively, can move axially in this dead slot at this unshowned impulse pin 12.

Except guiding impulse pin 12, described

part

14,15 is shaped like this, and making also can integrated other function.A block stamp acquisition loop 18 is integrated in the driving side part 14 of main body 13, so that catch block stamp 20 in dry running.Block stamp acquisition loop 18 be arranged on driving side and its freely, protuberance shape ground thickening on the end that is in driving side under the installment state.Block stamp acquisition loop 18 axially constitutes highlightedly.The internal diameter of block stamp acquisition loop 18 is less than external diameter thickening, the end 30 cutter side, shown in Figure 1 of block stamp 20.Block stamp acquisition loop 18 is connected with described part 14 by the neck 28 of a hollow cylinder.Neck 28 has an internal diameter of widening with respect to the internal diameter of block stamp acquisition loop 18.

The driving side part 14 of main body 13 is shaped like this, make this part except guiding impulse pin 12 and block stamp capturing function, also satisfy other function, for example at dry running-or sealing function and/or the vibration-damping function of B when impacting, so that damping is in the recoil of this appearance and support drill bit in the machine.This for example can by a plurality of around groove 31 realize that described groove is arranged on being on the end of cutter side of driving side part 14 under installment state.

The cutter side part 15 of main body 13 comprises that with the form shaping of steel bushing and in the cutter side dry running of described inside impacts backstop convex shoulder 16.The outer surface 33 of this part 15 is tapered corresponding to a shape that complementally constitutes with the annular convex shoulder 32 of hammering pipe 23 into shape in the cutter side.Therefore the outer surface 33 of this part 15 can be supported on this annular convex shoulder 32.

Claims

1. percussion mechanism, be used for one and can be impacted hand held power machine, especially hammer drill and/or the jump bit that ground drives at least, this hand held power machine has the tool mounting (10) that a CD-ROM drive motor and is used to receive cutter, this percussion mechanism comprises that one can axially move and act on the impulse pin (12) on the cutter in impulse pin guider (11), wherein, impulse pin guider (11) comprises that one surrounds the main body (13) of impulse pin (12), and it is characterized in that: this main body (13) is made of at least two kinds of materials with different hardness.

2. by the described percussion mechanism of claim 1, it is characterized in that: the driving side part (14) of this main body (13) is made of elastomer.

3. by claim 1 or 2 described percussion mechanisms, it is characterized in that: the cutter side part (15) of this main body (13) is made of steel.

4. by the described percussion mechanism of claim 3, it is characterized in that: a potted component is arranged on the interior and/or outer peripheral face of driving side part (14) of this main body (13).

5. by the described percussion mechanism of claim 4, it is characterized in that: the sealing element surrounds impulse pin (12) circlewise.

6. by each described percussion mechanism of claim 2 to 5, it is characterized in that: a block stamp acquisition loop (18) is integrated on the driving side part (14) of main body (13).

7. by each described percussion mechanism of claim 1 to 5, it is characterized in that: an independent block stamp acquisition loop is set.

8. by each described percussion mechanism of claim 2 to 7, it is characterized in that: the cutter side part (15) of this main body (13) constitutes more longways than driving side part (14).

9. by each described percussion mechanism of claim 2 to 8, it is characterized in that: the driving side part (14) of this main body (13) constitutes more longways than cutter side part (15).

10. the hand held power machine that ground drives can be impacted at least, especially hammer drill and/or jump bit, it has the tool mounting (10) that a percussion mechanism, a CD-ROM drive motor and are used to receive cutter, wherein, this percussion mechanism comprises that one can axially move and act on the impulse pin (12) on the cutter in impulse pin guider (11), wherein, impulse pin guider (11) comprises that one surrounds the main body (13) of impulse pin (12), and it is characterized in that: this main body (13) is made of at least two kinds of materials with different hardness.