EP1261459B1 - Luftfederschlagwerk mit hohlem schlagkolben - Google Patents
Luftfederschlagwerk mit hohlem schlagkolben Download PDFInfo
- Publication number
- EP1261459B1 EP1261459B1 EP00942113A EP00942113A EP1261459B1 EP 1261459 B1 EP1261459 B1 EP 1261459B1 EP 00942113 A EP00942113 A EP 00942113A EP 00942113 A EP00942113 A EP 00942113A EP 1261459 B1 EP1261459 B1 EP 1261459B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- idling
- percussive mechanism
- pneumatic spring
- guide sleeve
- piston
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D11/00—Portable percussive tools with electromotor or other motor drive
- B25D11/04—Portable percussive tools with electromotor or other motor drive in which the tool bit or anvil is hit by an impulse member
Definitions
- the invention relates to an air spring hammer mechanism for a percussion and / or Hammer drill.
- a design has proven itself in which a drive piston is driven by a Crank drive in a hollow, also called a hollow club Percussion piston is axially reciprocated.
- the percussion piston is in the Percussion mechanism housing also axially movable, with one Cavity between the drive piston and the percussion piston an air spring trains the axial movement of the drive piston on the percussion piston transmits and drives it against a tool shank or an anvil where the kinetic energy of the percussion piston is suddenly implemented.
- a Percussion piston and a diameter-equal drive piston in one Guide tube are arranged axially movable. Are in the guide tube Idle openings arranged when the tool is lifted from the machining rock can be run over by the percussion piston, so that the cavity between the percussion and drive pistons with the environment can communicate. This creates a suck back effect through the drive piston avoided so that the percussion piston remains in its forward position.
- the invention has for its object an air spring hammer mechanism with a hollow Specify percussion piston, in which the disadvantages described above avoided be without having to forego the advantages mentioned.
- the air spring hammer mechanism is on the inside the cavity of the percussion piston guide sleeve of the percussion piston at least one axially extending air compensation pocket is provided. Furthermore, at least one idle opening extends radially through the Guide sleeve. There is no connection between the idle opening in impact operation and an idle channel leading to the environment in the striking mechanism housing, so that the air spring receiving cavity between the drive piston and the percussion piston is decoupled from the environment. In contrast, in idle mode, the idle opening can be moved via the idle channel, so that the cavity through the idle port and the idle channel can be connected to the environment. This enables an intense Air balance at idle, so that any suction effect of the drive piston can be prevented.
- the air compensation pocket preferably has a greater axial length than a contact surface of the drive piston with the guide sleeve. That means, that the air escaping from the air spring with each blow in blow operation can be refilled via the air compensation pocket.
- the idle ports In a particularly advantageous embodiment of the invention are in the Guide sleeve provided several idle openings, which in terms of Axial position can be arranged offset.
- the idle ports have different opening cross-sections. Depending on the arrangement of the idle ports and the cross sections it is possible to transition between gently running idle and blow operation, which in particular is perceived as pleasant by the operator and the application of the tool made possible in exposed areas without the tool jumping off.
- the guide sleeve has several sliding surfaces on which they are guided in the striking mechanism housing becomes. There are recesses with a smaller radius between the sliding surfaces intended. Due to the reduced friction surfaces and thus less There may be friction between the percussion piston and the percussion mechanism housing better cold start behavior can be achieved at low temperatures. Farther the manufacturing costs can be processed due to the lower Reduce the outside area.
- the idle ports should be arranged so that they each penetrate a sliding surface, as this means no additional sealing between the guide sleeve of the percussion piston and the percussion mechanism housing is required.
- an air damper can be generated in the front cavity. If the front Cavity during the transition of the percussion piston from the percussion mode to the idle mode - That is, with a forward movement of the percussion piston towards idle position - temporarily separated from the environment is, air pressure can build up in the cavity, so that part of the kinetic Energy of the percussion piston to the air spring created in the cavity is delivered.
- the front cavity can be connected to the environment via one of the recesses.
- the compressed air in the front cavity can escape, so that the energy stored in the air spring is dissipated by the pressure reduction becomes.
- the air spring also works as an air damper and breaks down the kinetic energy of the percussion piston so that it hits the piston on a housing end wall and thus reaching its idle position is braked. Accordingly, the impact piston strikes too violently avoided on the housing, which the operator also found pleasant becomes.
- a percussion piston is located on a guide surface 1 of a striking mechanism housing 2 3 guided axially movable. Inside the hollow one on one end face Percussion piston 3, a drive piston 4 is guided in a known manner is axially reciprocated by a connecting rod 5.
- A is formed between the percussion piston 3 and the drive piston 4 Air spring enclosing cavity 6.
- the percussion piston 3 has at least one, but expediently two, three or more air compensation pockets 7, which are axially in the inside of a the hollow guide sleeve 8 of the percussion piston 3 with a length greater than the axial length of a contact surface of the drive piston 4 with the Extend percussion piston 3.
- the air compensation pockets 7 are even on Scope of the guide sleeve 8 distributed.
- the percussion piston 3 consists essentially from the guide sleeve 8, a piston crown and one of the Piston extension 9 extending piston crown.
- a shaft 10 of a tool 11 is arranged in front of the piston extension 9 in such a way that that the percussion piston 3 with its piston extension 9 on the shaft 10 can open (Fig. 1).
- the guide sleeve 8 are at least one, but preferably two, three or more idle openings 12 formed, the guide sleeve 8 penetrate radially and through which the cavity 6 with an idle channel 13 can be connected (FIGS. 3 and 4).
- the idle openings 12 are as uniform as possible for reasons of symmetry distributed around the circumference of the guide sleeve 8, but in other places than the air compensation pockets 7.
- the symmetry of the guide sleeve 8 and the impact piston 3 is therefore to be aimed primarily at for manufacturing reasons, to delay the impact piston 3 z. B. to avoid grinding.
- Idle openings 12 are Idle openings 12, however, also in the same places as the air compensation pockets 7 arranged, that is, they penetrate the opposite of the Thickness of the guide sleeve 8 thinner rear wall of the air compensation pockets 7 outward.
- the bore axes of the idle openings 12 can be perpendicular to Stroke axis, that is to the direction of movement of the percussion piston 3. However, it is particularly advantageous if the bore axes are at an angle to Stroke axis and the idle openings 12 in the guide sleeve 8th are directed forward and outward. This will make fat that is in one has collected previous stroke at the idle opening 12, when hitting of the percussion piston 3 thrown out of the idling opening 12 onto the shaft 10. Otherwise, that is, at a right-angled position between the bore axis the idle ports 12 and the flapping axis may be the problem occur that the holes at least partially clog with grease, which the Can decrease reliability when transitioning to idle.
- the idle channel 13 is connected to the environment via a connecting channel 14, z. B. the crankcase of the crank mechanism for the drive piston 4, in connection.
- the idle channel 13 is in the illustrated embodiment as Ring channel formed.
- the idle channel 13 and the connecting channel 14 also have other shapes and z. B. only consist of a correspondingly generous recess. It is important that the cavity 6 is suitably associated with the environment can be achieved in order to achieve the desired pressure equalization.
- An outer surface guided in the guide surface 1 of the striking mechanism housing 2 the percussion piston 3 is formed by several - here three - sliding surfaces 15. There is a recess between each two adjacent sliding surfaces 15 16 provided.
- a front air spring is formed in a cavity 18 when the front sliding surface 15 interrupts a connection to the idle channel 13, as shown in Figs. 1 and 2.
- the percussion piston 3 In the striking position shown in FIGS. 1 and 2 the percussion piston 3 cannot move forward (in the figures to the left). This means that the air pressure in cavity 18 is essentially corresponds to the ambient air pressure because the percussion piston 3 in the shown position just a control edge 19 on the striking mechanism housing 2nd has run over.
- the front sliding surface 15 already seals with the Guide surface 1 of the striking mechanism housing 2 against the front cavity 18 the environment.
- the percussion piston 3 can also move in the next percussion cycle move further forward.
- the cavity 18 is thereby reduced and compresses the air in the air spring. As a result, the percussion piston 3 braked.
- air compensation pockets 7 and idle openings 12 - make it possible to optimize each of the functions independently of the other and target them to adapt to the demands.
- Over large air cross sections with several air equalization pockets 7 can intensive air equalization to the air spring in the cavity 6 take place, whereby the tendency of the striking mechanism to collapse, d.
- the axial arrangement of the idle openings, which is important for perfect idling 12 can be varied within wide limits without the Air compensation pockets 7 must be taken into account.
- the symmetry of the percussion piston 3 results in its manufacture practically no delay, which lowers manufacturing costs and durability elevated.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Percussive Tools And Related Accessories (AREA)
Description
- Fig. 1
- einen Schnitt durch ein erfindungsgemäßes Luftfederschlagwerk in Schlagstellung;
- Fig. 2
- einen vergrößerten Ausschnitt aus Fig. 1;
- Fig. 3
- einen Schnitt durch das Luftfederschlagwerk in Leerlaufstellung; und
- Fig. 4
- einen vergrößerten Ausschnitt aus Fig. 3.
Claims (14)
- Luftfederschlagwerk für einen Schlag- und/oder Bohrhammer miteinem Schlagwerksgehäuse (2);einem axial hin- und herbewegbaren Schlagkolben (3), der an einer Stirnseite hohl ausgebildet ist und eine in dem Schlagwerksgehäuse (2) geführte Führungshülse (8) aufweist;einem in der Führungshülse (8) des Schlagkolbens (3) geführten, axial hin- und herbewegbaren Antriebskolben (4);einem zwischen dem Antriebskolben (4) und dem Schlagkolben (3) ausgebildeten und eine Luftfeder aufnehmenden Hohlraum (6);sich auf der Innenseite der Führungshülse (8) des Schlagkolbens (3) wenigstens eine Luftausgleichstasche (7) axial erstreckt;die Führungshülse (8) des Schlagkolbens (3) von wenigstens einer Leerlauföffnung (12) durchdrungen ist;in dem Schlagwerksgehäuse (2) ein mit der Umgebung kommunizierender Leerlaufkanal (13, 14) ausgebildet ist;in einem Schlagbetrieb des Luftfederschlagwerks keine Verbindung zwischen der Leerlauföffnung (12) und dem Leerlaufkanal (13, 14) besteht; und dassin einem Leerlaufbetrieb die Leerlauföffnung (12) über den Leerlaufkanal (13, 14) bewegbar ist und der Hohlraum (6) über die Leerlauföffnung (12) und den Leerlaufkanal (13, 14) mit der Umgebung in Verbindung bringbar ist.
- Luftfederschlagwerk nach Anspruch 1, dadurch gekennzeichnet, daß die Luftausgleichstasche (7) eine größere axiale Länge aufweist, als eine Berührfläche des Antriebskolbens (4) mit der Führungshülse (8).
- Luftfederschlagwerk nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß in der Führungshülse (8) drei Luftausgleichstaschen (7) und drei Leerlauföffnungen (12) jeweils am Umfang gleichmäßig verteilt vorgesehen sind.
- Luftfederschlagwerk nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß in der Führungshülse (8) mehrere Leerlauföffnungen (12) in, bezüglich einer Hauptachse der Führungshülse (8), unterschiedlicher Axiallage vorgesehen sind.
- Luftfederschlagwerk nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß mehrere Leerlauföffnungen (12) mit unterschiedlichen Öffnungsquerschnitten vorhanden sind.
- Luftfederschlagwerk nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß in einer äußeren Umfangsfläche der Führungshülse (8) mehrere Gleitflächen (15) zum Führen der Führungshülse (8) in dem Schlagwerksgehäuse (2) vorgesehen sind.
- Luftfederschlagwerk nach Anspruch 6, dadurch gekennzeichnet, daß zwischen benachbarten Gleitflächen (15) jeweils eine Ausnehmung (16) mit einem geringeren Radius vorgesehen ist.
- Luftfederschlagwerk nach Anspruch 6 oder 7, dadurch gekennzeichnet, daß eine der Gleitflächen (15) von der Leerlauföffnung (12) durchdrungen wird.
- Luftfederschlagwerk nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß der Leerlaufkanal (13) in einer den Schlagkolben (3) führenden Führungsfläche (1) des Schlagwerksgehäuses (2) ringförmig ausgebildet ist.
- Luftfederschlagwerk nach Anspruch 9, dadurch gekennzeichnet, daß der Leerlaufkanal (13) über einen Verbindungskanal (14) mit der Umgebung kommuniziert.
- Luftfederschlagwerk nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, daß in einem zwischen einer Vorderseite (17) des Schlagkolbens (3) und dem Schlagwerksgehäuse (2) ausgebildeten vorderen Hohlraum (18) ein Luftdämpfer erzeugbar ist.
- Luftfederschlagwerk nach Anspruch 11, dadurch gekennzeichnet, daß der vordere Hohlraum (18) beim Übergang des Schlagkolbens (3) vom Schlagbetrieb in den Leerlaufbetrieb zeitweilig von der Umgebung getrennt ist.
- Luftfederschlagwerk nach Anspruch 11, dadurch gekennzeichnet, daß der vordere Hohlraum (18) im Leerlaufbetrieb mit der Umgebung in Verbindung steht.
- Luftfederschlagwerk nach einem der Ansprüche 1 bis 13, dadurch gekennzeichnet, daß die Luftausgleichstasche (7) und die Leerlauföffnung (12) an verschiedenen Stellen in der Führungshülse (8) angeordnet sind.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19929183A DE19929183B4 (de) | 1999-06-25 | 1999-06-25 | Luftfederschlagwerk mit Hohl-Schlagkolben mit Leerlauföffnung |
DE19929183 | 1999-06-25 | ||
PCT/EP2000/005752 WO2001000368A2 (de) | 1999-06-25 | 2000-06-21 | Luftfederschlagwerk mit hohlem schlagkolben |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1261459A2 EP1261459A2 (de) | 2002-12-04 |
EP1261459B1 true EP1261459B1 (de) | 2004-09-29 |
Family
ID=7912544
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00942113A Expired - Lifetime EP1261459B1 (de) | 1999-06-25 | 2000-06-21 | Luftfederschlagwerk mit hohlem schlagkolben |
Country Status (6)
Country | Link |
---|---|
US (1) | US6568484B1 (de) |
EP (1) | EP1261459B1 (de) |
JP (1) | JP2003514675A (de) |
DE (2) | DE19929183B4 (de) |
ES (1) | ES2225169T3 (de) |
WO (1) | WO2001000368A2 (de) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10103996C1 (de) * | 2001-01-30 | 2002-10-02 | Wacker Werke Kg | Luftfederschlagwerk für einen Schlag- und/oder Bohrhammer mit kurz bauendem Antriebskolben |
DE10333799B3 (de) * | 2003-07-24 | 2005-02-17 | Wacker Construction Equipment Ag | Hohlkolbenschlagwerk mit Luftausgleichs- und Leerlauföffnung |
JP4179159B2 (ja) * | 2003-12-18 | 2008-11-12 | 日立工機株式会社 | 打撃工具 |
JP4200918B2 (ja) * | 2004-02-09 | 2008-12-24 | 日立工機株式会社 | 穿孔機 |
DE102006060320A1 (de) * | 2006-12-20 | 2008-06-26 | Robert Bosch Gmbh | Schlagwerk für eine Handwerkzeugmaschine |
DE102007000081A1 (de) * | 2007-02-08 | 2008-08-21 | Hilti Ag | Handwerkzeugmaschine mit pneumatischem Schlagwerk |
DE102007027898A1 (de) * | 2007-06-18 | 2008-12-24 | Robert Bosch Gmbh | Elektrowerkzeug mit Kaltstartfunktion |
US8636081B2 (en) | 2011-12-15 | 2014-01-28 | Milwaukee Electric Tool Corporation | Rotary hammer |
GB201112829D0 (en) * | 2011-07-26 | 2011-09-07 | Black & Decker Inc | Hammer |
DE102012208986A1 (de) * | 2012-05-29 | 2013-12-05 | Hilti Aktiengesellschaft | Meißelnde Werkzeugmaschine |
US9416593B2 (en) | 2012-12-28 | 2016-08-16 | Smith International, Inc. | Piston strike face and bit interface for percussion hammer drill |
EP2857149A1 (de) * | 2013-10-03 | 2015-04-08 | HILTI Aktiengesellschaft | Handwerkzeugmaschine |
US10814468B2 (en) | 2017-10-20 | 2020-10-27 | Milwaukee Electric Tool Corporation | Percussion tool |
EP4349534A2 (de) | 2018-01-26 | 2024-04-10 | Milwaukee Electric Tool Corporation | Schlagwerkzeug |
FI20206303A1 (en) * | 2020-12-15 | 2022-06-16 | Lekatech Oy | Impact device |
Family Cites Families (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1057028B (de) * | 1955-07-06 | 1959-05-06 | Kango Electric Hammers Ltd | Schlaggeraet |
US3034302A (en) * | 1960-03-28 | 1962-05-15 | Black & Decker Mfg Co | Momentary venting means for poweroperated percussive tool |
DE1976272U (de) * | 1967-10-20 | 1968-01-04 | Heinz Esser | Oelofen-anzuender. |
DE2124013A1 (de) * | 1970-05-11 | 1971-11-25 | Banzi F | Schlagvorrichtung für elektropneumatischen Hammer und dazugehörige funktionsfähige Methode |
US3688848A (en) * | 1971-03-15 | 1972-09-05 | Black & Decker Mfg Co | Air spring bleed assembly |
DE2260365A1 (de) * | 1972-12-09 | 1974-06-12 | Bosch Gmbh Robert | Luftpolsterschlagwerk |
DE2262273A1 (de) * | 1972-12-20 | 1974-07-04 | Duss Maschf | Schlaggeraet |
US3835935A (en) * | 1973-03-19 | 1974-09-17 | Black & Decker Mfg Co | Idling system for power hammer |
DE2335924A1 (de) * | 1973-07-14 | 1975-02-06 | Bosch Gmbh Robert | Handwerkzeugmaschine mit betriebszeitanzeigevorrichtung |
DE3010479A1 (de) * | 1980-03-19 | 1981-10-08 | Robert Bosch Gmbh, 7000 Stuttgart | Werkzeugmaschine, insbesondere handwerkzeugmaschine mit einem luftfederschlagwerk |
DE3168959D1 (en) * | 1980-11-18 | 1985-03-28 | Black & Decker Inc | Percussive drills |
DE3304916A1 (de) * | 1983-02-12 | 1984-08-16 | Robert Bosch Gmbh, 7000 Stuttgart | Bohrhammer |
DE3826213A1 (de) * | 1988-08-02 | 1990-02-15 | Bosch Gmbh Robert | Bohr- oder schlaghammer |
JP3459493B2 (ja) * | 1995-05-25 | 2003-10-20 | 株式会社マキタ | 打撃工具 |
JP3292969B2 (ja) * | 1995-08-18 | 2002-06-17 | 株式会社マキタ | ハンマードリル |
JP3292972B2 (ja) * | 1996-03-29 | 2002-06-17 | 株式会社マキタ | 打撃工具 |
DE19714287A1 (de) * | 1997-04-07 | 1998-10-08 | Hilti Ag | Bohr- und/oder Meisselgerät |
DE19714288A1 (de) * | 1997-04-07 | 1998-10-08 | Hilti Ag | Bohr- und/oder Meisselgerät |
DE19726272A1 (de) | 1997-06-20 | 1999-01-07 | Wacker Werke Kg | Einseitiges Luftfeder-Schlagwerk mit Leerlaufzustand |
-
1999
- 1999-06-25 DE DE19929183A patent/DE19929183B4/de not_active Expired - Fee Related
-
2000
- 2000-06-21 EP EP00942113A patent/EP1261459B1/de not_active Expired - Lifetime
- 2000-06-21 ES ES00942113T patent/ES2225169T3/es not_active Expired - Lifetime
- 2000-06-21 US US10/018,590 patent/US6568484B1/en not_active Expired - Fee Related
- 2000-06-21 JP JP2001506063A patent/JP2003514675A/ja active Pending
- 2000-06-21 DE DE50008035T patent/DE50008035D1/de not_active Expired - Lifetime
- 2000-06-21 WO PCT/EP2000/005752 patent/WO2001000368A2/de active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
EP1261459A2 (de) | 2002-12-04 |
DE19929183B4 (de) | 2004-07-29 |
WO2001000368A2 (de) | 2001-01-04 |
ES2225169T3 (es) | 2005-03-16 |
US6568484B1 (en) | 2003-05-27 |
DE19929183A1 (de) | 2001-01-04 |
WO2001000368A3 (de) | 2002-09-26 |
JP2003514675A (ja) | 2003-04-22 |
DE50008035D1 (de) | 2004-11-04 |
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