CN100563940C

CN100563940C - Flexible punch guide

Info

Publication number: CN100563940C
Application number: CNB200410044624XA
Authority: CN
Inventors: 阿希姆·迪塞尔贝格; 屈特·西贝尔
Original assignee: Sunworld Industries Saxony Ltd
Current assignee: Sunworld Industries Saxony Ltd
Priority date: 2003-05-20
Filing date: 2004-05-19
Publication date: 2009-12-02
Anticipated expiration: 2024-05-19
Also published as: EP1479485A1; DE10362025A1; DE10362025B4; CN1572432A

Abstract

The present invention relates to a kind of percussive drill and/or jump bit machine, it has a drive motor, a beater mechanism and a tool holder (10) that is used to receive cutter (B), wherein beater mechanism comprises a drift (6) that can axially move and act on the cutter in punch guide (4), and the present invention proposes: punch guide (4) comprise an encirclement drift (6), its cross section is the parts of being made by elastomeric material (36) of annular.

Description

Flexible punch guide

Technical field

The present invention relates to a kind of percussive drill or jump bit machine that a drive motor, beater mechanism and are used to receive the tool holder of cutter that have, wherein beater mechanism comprises a drift that can axially move and act on the cutter in punch guide.

Background technology

In order on electrically driven (operated) portable electric percussive drill or jump bit machine, to make the inner chamber that is marked with lubricant form sealing relatively on every side, the beater mechanism that this electric device is used to transmit shock pulse generally includes a so-called drift, this drift can be bearing in the punch guide with moving axially and apply impact by a hammer part of beater mechanism at driving side on boring and impact direction, and drift is delivered to impact energy the driving side end of the cutter that is received in the tool holder.The percussive drill of the described type of beginning part or jump bit machine are for example open by DE 199 33 972A1 or the applicant's DE 42 41 000A1.

Usually the drift that is made by steel is led in tool holder or in the steel hammer pipe that driving side is connected with tool holder firmly.This need can not surpass the minimal tolerance of determining when the contact-making surface of processing drift and tool holder or hammer pipe, so that make parts remain on the truncation Line and look after the little power of walking crosswise.In order to guarantee percussive drill or jump bit machine function up to specification, other parts of in the hammer pipe that preferably drives rotationally, packing into, they have sealing function, the unloaded or boring-impact of damping drift or catch the hammer spare of beater mechanism in idle condition.For the globality that satisfies the set parts of these functions poor.

Summary of the invention

According to the present invention, a kind of percussive drill or jump bit machine have been proposed, has a drive motor, a beater mechanism and a tool holder that is used to receive cutter, wherein beater mechanism comprises a drift that can axially move and act on the cutter in punch guide, wherein, punch guide comprises an encirclement drift, its cross section is the parts of being made by elastomeric material of annular, these parts make by elastomeric material and in some zones of this drift thicken mid portion both sides sealing lean against on the cylindrical peripheral face of this drift.

By contrast, percussive drill of the present invention or jump bit facility have its advantage, can save the accurate interior processing of hammer pipe in the drift zone.In addition, can make at low cost and distortion in this wise in the case by the parts that elastomeric material is made, so that except that the guiding of drift, can satisfy a plurality of other functions, for example the damping of sealing function, zero load or boring-impact and/or in idle condition, catch hammer spare.

For the damping of no-load percussion, propose in a preferred configuration of the present invention: takeed in no-load percussion-supporting that tool side has an inside by the parts that elastomeric material is made, drift leans against on this shoulder when idle condition.By making the drift that preferably is formed from steel lean against the generation that for example can reduce noise in idle condition on no-load percussion-supporting shoulder of the described parts of making by elastomeric material.

Damping brake drift when drift moves backward in impacting operating mode, the parts of being made by elastomeric material preferably have boring-impacts-backstop shoulder of a driving side, and its is delivered to the resilience of cutter of damping afterwards on the cutter at shock pulse.

The parts of being made by elastomeric material preferably have a perforation axial groove that is used for drift, in this groove drift can be between idle position and impact position the limited earth's axis to moving.In order to receive the increase mid portion of drift, conform with the destination, groove increases between no-load percussion-supporting shoulder and boring-impact-backstop shoulder, and the mid portion that increases in impacting operating mode is leaning against on no-load percussion-supporting shoulder with its leading flank on boring-impact-backstop shoulder and in idle condition with its trailing flank backstop thus.In order to be easy to increase mid portion importing no-load percussion-supporting shoulder of this drift and the zone between boring-impact-backstop shoulder, the unit architecture that should be made by elastomeric material becomes two parts, and wherein the cutter side comprises that partly no-load percussion-supporting shoulder and driving side partly comprise boring-impact-backstop shoulder.Also can parts be made of the elastomeric material one in principle equally well, import to for augmenting portion in the augmenting portion of groove drift, but the end of its driving side or cutter side radial expansion under the situation of recoverable strain.These parts that are made of elastomeric material can for example can satisfy different functional requirements by the respective material characteristic of various piece by forming more than two part in principle.

When these parts also are used for then can reaching the further function globality of these parts of being made by elastomeric material when idle condition is caught the hammer part.The parts of being made by elastomeric material are caught the hammer ring what driving side preferably had an one of axially stretching out for this reason, the external diameter of the end that this internal diameter of catching the hammer ring increases less than the cutter side of beater mechanism hammer part.The end that increases for the cutter side that can make the hammer part is passed and is caught the hammer ring, internal diameter or an internal diameter that inserts the interior pipe of hammer pipe on this position of hammering pipe into shape conform with the destination greater than the external diameter of catching the hammer ring, can radially expand so that catch the hammer ring when the end that the cutter side of hammering part into shape increases is passed.

For stop when from impact operating mode when carrying out the transition to idle condition drift striking on no-load percussion-supporting shoulder of elastically deformable resilience and running into thus and be fixed on the increase front end of catching the hammer spare the hammer ring and make the hammer part knocking-on encircling from catching hammer backward, this especially may occur under the situation too flexibly in the drift motion, another preferred configuration of the present invention is, some brakings are carried out in the resilience campaign that drift is possible, to stop the hammer part by knocking-on from catch the hammer ring.The braking of resilience campaign is preferably carried out in this wise: when above-mentioned drift travels forward, the air between the increase mid portion leading flank of drift and the no-load percussion-supporting shoulder be located at the increase mid portion of drift by at least one with the parts of making by elastomeric material between airflow path can flow to the rear side of the increase mid portion of drift, will make the drift resilience kinetic damping and the deceleration that then may occur here.This airflow path for example can be used as the increase mid portion of drift and the parts made by elastomeric material between the annular gap constitute.But preferably constitute the axial groove in the parts inwall of making by elastomeric material or the form of passage, because the increase mid portion of drift can constitute an interference fits with the inwall of the parts of adjacent elastomeric material work between no-load percussion-supporting shoulder and boring-impact-backstop are takeed in the case, so that drift nuzzles up and produces additional brake in this way along elastomeric material when possible resilience.

In order to prevent that reciprocating motion by drift from making a large amount of lubricants send out and arrive the surrounding environment from the percussive drill that is marked with lubricant or the interior space of jump bit machine in the cutter side, at least one parts of being made by elastomeric material is preferably in the sealing area that its two axially-spaceds arrange is pressed on the annular outer circumference surface of drift with annular inner peripheral surface at least.Preferably wherein at least one sealing area is arranged on the cutter side that no-load percussion-supporting is takeed on, and wherein another sealing area is arranged on the driving side that boring-impact-backstop is takeed at least.

Because each sealing area has constituted multi-stage sealed between drift and the punch guide, on the other hand, if be pressed over tightly on the drift, the danger of lack of lubrication in the punch guide cutter side part is just arranged because the parts that the former reason elastomeric material of tolerance is made are crossed at one or more sealing areas of driving side.For fear of this problem of generation, at least in a part of driving side sealing area or the parts of making by elastomeric material within it on the periphery or drift on its outer circumference surface, be provided with the suitable type exterior feature of axial ditch or groove or other, when when impacting operating mode to the idle condition transition since the piston action of drift can make by these type exterior features the cutter side part that is drawn onto punch guide by the lubricant of drift controlled quentity controlled variable.

For the fixing parts of making by elastomeric material of integral body or multi-piece type of relatively tool holder and relative cutter, according to another preferred configuration of the present invention, these parts are inserted in the hammer pipe that constitutes with the tool holder one, its outer circumference surface leans against on the inner peripheral surface of hammer pipe, to avoid the radial deformation of these parts.In the cutter side, these parts front end of handy its boring direction are bearing on the ring shoulder of hammer pipe, and at driving side, conform with the destination, and these parts are fixed by an annular fixing member that removably is inserted in the hammer pipe and support against boring direction.This annular fixing member for example can be fixed in the hammer pipe by a collar or annulus, but preferably is provided with from radially-protruding Monolithic spring hook, and they are engaged in the interior pore of hammer pipe and are bearing on the driving side arc arch (Laibungen) of pore.

Description of drawings

Below will describe the present invention in detail by two embodiment by accompanying drawing.Accompanying drawing is:

Fig. 1: the longitudinal section of the punch-head assembly of portable electric percussive drill with drift and punch guide or jump bit machine;

Fig. 2: the zoomed-in view of section A among Fig. 1;

Fig. 3: one be used for a punch guide part, at the perspective view of the not shown driving side fixture of Fig. 2;

Fig. 4: the partially cutaway view of the punch guide part that has drift of a flexible program;

Fig. 5:, but wherein do not have drift corresponding to the view of Fig. 4.

The specific embodiment

The punch-head assembly 2 of the beater mechanism of shown in Figure 1 in the accompanying drawing, portable electric percussive drill or jump bit machine (not shown) can be made up of by axially movable drift 6 in punch guide 4 punch guide 4 and one basically, and the shock pulse of the hammer spare 8 of the beater mechanism that this drift will be driven by the drive motor of portable percussive drill or jump bit machine is delivered on the drill bit or impact tool B in the tool holder 10 that is inserted in this toolroom machine.

As the most clearly expression among Fig. 4, the drift of being made by solid steel 6 is formed by the microscler

cylindrical end portion

12,14 of two planar end surfaces 16 that have a chamfering and with these two end parts, 12,14 mid portions 18 that thicken that be connected and that be arranged between them.This mid portion 18 have in the middle one narrow, preferably but must not be columniform periphery 20 and on both sides, be the boundary with an oblique leading flank 22 and an oblique trailing flank 24.Two

sides

22,24 are connected with the

cylindrical circumference face

30 or 32 of these two

end parts

12 or 14 smoothly by

recessed transition face

26 or 28.

Punch guide 4 comprises: a hammer pipe 34, and it is bearing in the housing (not shown) of percussive drill or jump bit machine in the axial direction; Reach one and be fixed on the parts 36 that constitute by elastomeric material in the hammer pipe 34.Hammer pipe 34 is by two area under control sections 40 that connect by conical ring shoulder 38,42 form, wherein preceding area under control section has minor diameter and constitutes tool holder 10, then the area under control section have major diameter and in its back-end portion open wide, can parts 36, drift 6, hammer part 8 and a piston 44 that acts on the beater mechanism on the hammer part 8 be imported hammer pipe 34 from this side thus.Be configured with a mattress chamber 46 between piston 44 and the hammer part 8 in hammer pipe 34, this mattress chamber can be by the radially pore (not shown) ventilation in the wall of hammer pipe 34.

The parts 36 that kept by hammer pipe 34 and constitute by elastomeric material in the central with one lean against on hammer pipe 34 inner peripheral surfaces, preferably but to need not to be columniform outer peripheral face 48 be the boundary, this outer peripheral face also can be special-shaped, and have two

tapered ends

50,52, as the most clearly expression in Fig. 4 and 5.Cutter side end 50 has to be takeed on the shape of 38 complementations with the ring of hammer pipe 34 and is bearing on this ring shoulder, and the end 52 of driving side axially immovably is fixed on hammer by the retainer ring shown in Fig. 3 54 and manages in 34.Retainer ring 54 has an oblique annular contact surface (can not see) in the cutter side, driving side ring shoulder 56 complementations that the taper of this contact-making surface and parts 36 attenuates also are pressed on this ring shoulder, on the excircle of retainer ring, be provided with 3 carbines that stretch out 58, they engage in 3 pores of hammer pipe 34, and wherein the carbine arc arch that is bearing in this parts driving side is gone up and stoped parts 36 i.e. moving axially against boring direction backward in this way.

As the most clearly expression among Fig. 2, parts 36 are caught hammer ring 60 what driving side of its ring shoulder 56 was provided with an integral body, and what it was used for when impacting operating mode to the idle condition transition fixing hammer part 8 thickens leading section 62.The thickening of protuberance shape that constitutes one with parts 36 catch hammer ring 60 and be connected with these parts by a cylindrical neck part 64, and this neck portion has the internal diameter that the internal diameter of catching hammer ring 60 relatively increased and receive leading section 62 by the hammer spare 8 of latter's maintenance in the idle position shown in Fig. 2.The internal diameter of neck portion 64 is selected like this, so that neck portion 64 leans against on the periphery that thickens leading section 62 of hammer part 8 hermetically; And the internal diameter of catching hammer ring 60 is selected like this, also constitutes first sealing area on the cylindrical peripheral face 32 that encircles the driving side end parts 14 that leans against drift 6 hermetically here so that catch to hammer into shape in the impact position shown in Fig. 4.

Because catch the external diameter that thicken leading section 62 of the internal diameter of hammer ring 60 less than hammer part 8, and the external diameter of catching hammer ring is done to such an extent that extend to more than the internal diameter of catching the interior pipe 66 (Fig. 2) of hammer ring 60 in the hammer pipe 34 less than its adjacent hammer pipe 34 or one at driving side always, increase and radial and outward deformation but catch hammer ring 60 elastic recoverys ground thus, so as hammer part 8 thicken passing of leading section 62.

Parts 36 comprise a groove 68 that is used for drift 6, and it is the whole parts 36 of extend through in the axial direction.With the following and have the circular segments 72 of dwindling internal diameter by catching driving side section 70 that hammer ring 60 and neck portion 64 thereof the surround ground connection that links to each other of groove 68, it leans against equally hermetically on the cylindrical peripheral face 32 of driving side end parts 14 of drift 6 and also constitutes second sealing area here.Connecting a section 74 with back

transition face side

28,24 complementations in other words of drift 6 on section 72, this section 74 is configured for a boring-impact-backstop shoulder of the increase mid portion 18 of drift 6.

This section 74 can be provided with axial stria 76, as shown in Figure 5, when carrying out the transition to idle condition drift 6 relative parts 36 when the direction of drill bit cutter B moves forward punch stroke, can partly transmit a spot of lubricant to the cutter side of groove 68 by these strias from impacting operating mode.Drift 6 and parts 36 constitute the major part of a donkey at this moment, and its piston is that drift 6 is pressed onto a spot of lubricant in the augmenting portion of groove 68 by stria 76 when travelling forward.

The augmenting portion of groove 68 also comprises except that section 74: a cylindrical centre portion 78, its internal diameter are substantially corresponding to the external diameter of the narrow cylindrical peripheral face 20 in the middle of the drift 6; And one 78 that is connected with centre portion, with the leading flank of drift 6 or the diminishing section 80 of

transition face

22,26 complementations, it is configured for no-load percussion-supporting of the mid portion 18 of drift 6 increases and takes on.

In the zone of centre portion 78, the parts of being made up of elastomeric material 36 are provided with a plurality of axial grooves 82 in the inwall of its qualification groove 68, they are carrying out the transition to idle condition and are carrying out to the direction of cutter B when mobile as airflow path at drift 6 from impacting operating mode, and the air that is sealed in the augmenting portion front of drift 8 will flow through on mid portion 18 next doors and is pressed against in the zone of its back when drift moves by these airflow paths.If drift moves in groove 68 too flexibly and therefore form drift 6 resilience and existing thus under the situation of the danger that the front end that thickens 62 that makes hammer part 8 goes out on no-load percussion-supporting shoulder 80 from catch hammer ring 60, the air of Jiing is braked drift 6 backward.Except that the mattress of increase mid portion 18 back of drift 6, the additional brake that is used for the drift 6 relevant along the interference fits between the inwall of centre portion 78 at the cylindrical peripheral face 20 and the parts 36 of drift 6 with friction.Simultaneously forming another the 3rd sealing area between drift 6 and parts 36 on this position.

Cutter side at the increase centre portion 78 of groove 68 also is provided with one or two other sealing area, and the parts of being made by elastomeric material in these sealing areas 36 lean against on the drift 6 circlewise.These other sealing areas are positioned in the zone of cutter side cylindrical sector 84,86 of groove 68, and here parts 36 lean against on the periphery 30 of cutter side front end 12 of drift 6 hermetically.In parts 36, can have in case of necessity between the section 84,86 one or more around 88, two adjacent seals zones of groove between lubricant can accumulate in this groove.

The parts of being made by elastomeric material 36 can integrally constitute, as shown in Fig. 4 and 5; Or make two-part, as illustrated in figs. 1 and 2, to be convenient to in drift 6 lead-in grooves 68.In Fig. 2 two parts of these two-part parts 36 on the zone line of section 78 each other by touching.

Claims

1. percussive drill or jump bit machine, has a drive motor, a beater mechanism and a tool holder that is used to receive cutter, wherein, beater mechanism comprises a drift that can axially move and act on the cutter in punch guide, punch guide comprises an encirclement drift, its cross section is the parts of annular, it is characterized in that: these parts (36) make by elastomeric material and these parts (36) in one that is in this drift (6) some zones (60 that thicken the both sides of mid portion (18), 72,84,86) lean against hermetically on the cylindrical peripheral face (32,30) of this drift (6).

2. according to the percussive drill or the jump bit machine of claim 1, it is characterized in that: should have one in the cutter side by the parts (36) that elastomeric material is made and be used for no-load percussion drift (6), inner-supporting shoulder (80).

3. according to the percussive drill or the jump bit machine of claim 1 or 2, it is characterized in that: should have one at driving side by the parts (36) that elastomeric material is made and be used for boring-impact drift (6), inner-backstop shoulder (74).

4. according to the percussive drill or the jump bit machine of claim 1, it is characterized in that: the parts (36) that should make by elastomeric material take in a no-load percussion-supporting (80) the cutter side seal lean against on the cylindrical peripheral face (32) of drift (6).

5. according to the percussive drill or the jump bit machine of claim 1, it is characterized in that: should lean against hermetically on the cylindrical peripheral face (30) of drift (6) at the driving side of a boring-impact-backstop shoulder (74) by the parts (36) that elastomeric material is made.

6. according to the percussive drill or the jump bit machine of claim 1, it is characterized in that: should in the zone of boring-impact-backstop shoulder (74), be provided with axial ditch or groove (76) by the parts (36) that elastomeric material is made.

7. according to the percussive drill or the jump bit machine of claim 1, it is characterized in that: describedly make parts (36) by elastomeric material and be provided with axial ditch or groove (76) at the driving side of boring-impact-backstop shoulder (74).

8. according to the percussive drill or the jump bit machine of claim 1, it is characterized in that: the groove (68) that should have the perforation that is used for drift (6) by the parts (36) that elastomeric material is made.

9. according to the percussive drill or the jump bit machine of claim 1, it is characterized in that: be provided with and be used for when from impacting the device (20,78,82) that operating mode is braked the possible resilience campaign of drift (6) when carrying out the transition to idle condition.

10. according to the percussive drill or the jump bit machine of claim 1, it is characterized in that: be provided with at least one airflow path (82), can be pressed against the zone that thickens mid portion (18) back from mid portion (18) region in front that thickens of drift (6) by its air.

11. percussive drill or jump bit machine according to claim 1 is characterized in that: between the adjacent inner wall of the parts (36) that the outer circumference surface that thickens mid portion (18) (20) and this of drift (6) be made by elastomeric material, be provided with interference fits.

12. percussive drill or jump bit machine according to claim 1 is characterized in that: should constitute by parts (36) monoblock type that elastomeric material is made.

13. percussive drill or jump bit machine according to claim 1, it is characterized in that: should constitute by parts (36) two-piece type that elastomeric material is made, wherein, a part comprises a no-load percussion-supporting shoulder (80), and another part comprises a boring-impact-backstop shoulder (74).

14. percussive drill or jump bit machine according to claim 1 is characterized in that: the driving side end (52) of the parts (36) that should be made by elastomeric material is bearing on the fixture (54) in the hammer pipe (34) that removably is inserted in punch guide (4).

15. percussive drill or jump bit machine according to claim 14, it is characterized in that: this fixture (54) has the ledge (58) of the elastically deformable that upwards stretches out of footpath, and they are engaged in the pore of hammer pipe (34) and are bearing on the interface of driving side of pore.

16. percussive drill or jump bit machine according to claim 1 is characterized in that: the described parts of being made by elastomeric material (36) have an integrated hammer of catching at driving side and encircle (60).