EP1089855A1 - Luftfederschlagwerk mit antriebskolben mit geringer wandstärke - Google Patents
Luftfederschlagwerk mit antriebskolben mit geringer wandstärkeInfo
- Publication number
- EP1089855A1 EP1089855A1 EP99931180A EP99931180A EP1089855A1 EP 1089855 A1 EP1089855 A1 EP 1089855A1 EP 99931180 A EP99931180 A EP 99931180A EP 99931180 A EP99931180 A EP 99931180A EP 1089855 A1 EP1089855 A1 EP 1089855A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- guide sleeve
- piston
- drive piston
- air spring
- air
- 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.)
- Granted
Links
Classifications
-
- 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
- B25D11/005—Arrangements for adjusting the stroke of the impulse member or for stopping the impact action when the tool is lifted from the working surface
-
- 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
-
- 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
Definitions
- the invention relates to an air spring hammer mechanism for a hammer and / or hammer drill.
- a design has proven itself in which a drive piston designed as a hollow piston is set into an oscillating axial movement via a crank mechanism. Inside the drive piston, which is guided in the housing of the hammer, a massive percussion piston is moved, which protrudes from the open end of the hollow drive piston and cyclically acts on a chisel tool or an intermediate striker. For this purpose, an air spring is formed in a cavity between the percussion piston and the drive piston, which transfers the forced movement of the drive piston to the percussion piston and drives it against the tool.
- the striking mechanism takes up relatively little space and is inexpensive to manufacture.
- the percussion piston also achieves a high impact speed.
- the reliable start-up behavior of the striking mechanism from idle is also particularly advantageous.
- the high mass of the drive piston has proven to be disadvantageous, since it is also moved back and forth by the drive when idling, i.e. in a state in which the tool does not process any material.
- the relatively large vibrating masses make it difficult to handle the hammer when idling.
- a striking mechanism with a double-acting air spring is known from US-A-3,456,740.
- a drive piston In a drive piston, an air compensation slot is provided which can be passed over by a percussion piston which can move back and forth in the interior of the drive piston such that the front and rear air springs are alternately brought into connection with the surroundings. This will charge the air springs after every hit.
- double air spring hammer mechanisms require large installation space and cannot be operated in idle mode.
- EP 0 014 760 AI describes an air spring hammer mechanism with a hollow drive piston in which a percussion piston is driven by an air spring which is formed between the drive piston and the percussion piston.
- the percussion piston moves so far forward that the air spring can be connected to the surroundings via an idle hole.
- the air spring is refilled in impact mode via a radial bore in a guide sleeve of the drive piston, which is controlled via a stationary slot.
- the invention has for its object to achieve a reduction in the vibrations occurring at idle while maintaining the positive characteristics of the striking mechanism.
- an air spring hammer mechanism according to claim 1.
- Advantageous configurations of the air spring hammer mechanism are defined in the subclaims.
- the air spring hammer mechanism has a drive piston, with a piston suspension, a piston crown and with a guide sleeve, at least one air compensation slot being provided in the guide sleeve.
- the guide sleeve can be hollow cylindrical or have an elliptical or angular shape.
- a preferred embodiment is characterized in that the air compensation slot extends in the axial direction of the guide sleeve. It is therefore particularly advantageous that the guide sleeve has the smallest possible wall thickness of less than 5% of the diameter of the guide sleeve and is provided with idle openings.
- the drive piston can be used particularly advantageously in the air spring hammer mechanism, in which a percussion piston can be moved axially back and forth in the guide sleeve of the drive piston.
- the air compensation slot of the drive piston has a greater axial length than a contact surface of the percussion piston with the guide sleeve, so that a cavity formed between the drive piston and the percussion piston and enclosing an air spring with a front part of the drive piston, ie a front face of the hollow drive piston can be connected.
- the air spring can be ventilated after each blow through the air compensation slot, in which air from the surroundings, ie from the front side of the drive piston, into the cavity is sucked in.
- the air compensation slot is covered by the guide tube on its radial outside, so that a connection between the cavity and the environment is only possible in certain relative positions between the percussion piston and the drive piston, namely when the percussion piston with the entire length of its contact surface with the Drive piston lies within the axial extension of the air compensation slot.
- This arrangement enables an extremely compact structure of the striking mechanism, since there is no need for any radial ventilation openings.
- the drive piston can be designed with a minimal wall thickness and thus with the lowest possible weight, which considerably reduces the occurrence of undesired vibrations, especially when idling.
- Figure 1 is a side view and a cross section of the drive piston according to the invention.
- FIG. 2 shows a partial section through a rotary hammer with an air spring hammer mechanism, in which the drive piston according to the invention from FIG. 1 is used; and 3 shows an enlarged detail from FIG. 2.
- Fig. 1 shows a drive piston 1 according to the invention in side view and in cross section.
- the drive piston 1 is made of steel and has a hollow cylindrical guide sleeve 1 a.
- the guide sleeve la is open on one end face 1b - at the lower end in FIG. 1 and is covered on the other end face by a piston crown 2.
- a piston suspension 3 extends from the piston crown 2 in the form of two webs, each of which is penetrated by bores 4 transverse to the axial direction of the drive piston 1.
- a connecting rod pin is inserted into the bores 4, which connects the drive piston 1 to a connecting rod in an articulated manner.
- three air compensation slots 5 are provided which are offset by 120 ° to one another and extend in the axial direction of the guide sleeve la.
- the air compensation slots 5 serve to supply an air spring which forms in the interior of the guide sleeve la after each impact cycle with fresh air.
- idle openings 6 are formed in the guide sleeve 1 a, which are arranged in two axial rows 7, 8 in a zigzag shape.
- the distance between the individual idle openings 6 to one another is dimensioned such that an edge tangentially applied to the guide sleeve la during an axial movement can be run over by the idle openings 6 such that a connection between the inside of the guide sleeve la and their appearance.
- at least two idle openings 6 from different rows 7, 8 are adjacent to one another, the centers of the idle openings 6 in question in the axial direction of the guide sleeve la being at a distance which is smaller than the average of the diameter of the idle openings in question, as also from FIG. 1 becomes recognizable.
- the guide sleeve la has an extremely thin wall made of steel with a thickness of less than 3 mm.
- the weight of the drive piston 1 can thereby be minimized.
- the preservation of the material steel ensures performs particularly good wear, emergency running and sealing properties.
- 1 is of hollow cylindrical design. In other embodiments, however, it can also have other basic shapes and z. B. have an elliptical or angular hollow cross section. The shape of the components guiding the guide sleeve (housing) or guided by the guide sleeve (percussion piston) must be adapted accordingly.
- FIG. 2 shows a partial section through a hammer drill, in which the drive piston 1 according to the invention is used in an air spring hammer mechanism.
- FIG. 3 is an enlarged detail from FIG. 2 and serves to clarify the representation of the percussion mechanism.
- a crankshaft gear 11 is rotatably driven via an electric motor 10 and, together with a crankshaft disk 13 rotatably mounted in a hammer housing 12, forms a crankshaft which drives a connecting rod 14 made of plastic.
- the connecting rod 14 is articulated at its other end via a connecting rod pin 15 to the piston suspension 3 of the drive piston 1 according to the invention and thereby moves the drive piston 1 with its piston head 2 and the guide sleeve 1 axially in a part of the hammer housing 12 when the crankshaft rotates accordingly Guide tube 16 back and forth.
- a percussion piston 17 is arranged axially movably in the interior of the guide sleeve 1a and cyclically strikes an also axially movable striker 18 in a manner known per se against a tool (not shown).
- an air spring is built up in a cavity 19 between the drive piston 1 and the percussion piston 17, which is controlled by the crank mechanism forced movement of the drive piston 1 transmits to the percussion piston 17.
- the air spring supports the return movement of the percussion piston 17 caused by the rebound of the percussion piston 17 by the tool or the striker 18 by suction.
- the drive piston 1 is guided with its guide sleeve la in the guide tube 16, the inner contour of the guide tube 16 being adapted to the outer contour of the guide sleeve la.
- the guide tube 16 is hollow cylindrical, but can, for. B. with an angular guide sleeve la also have flat guide surfaces.
- the guide sleeve la is extremely thin-walled and has the air compensation slots 5, which can be connected to the ambient air atmosphere inside the hammer housing 11 via the front end face 1b of the drive piston 1.
- the air compensation slots 5 are completely covered by the guide tube 16 on their radial outer surface and lead the air to the cavity 19 in the axial direction with a corresponding relative position of the drive piston 1 and percussion piston 17.
- the air compensation slots 5 have a greater axial length than the percussion piston 17, but at least a greater axial length than a contact surface of the percussion piston 17 with the guide sleeve 1 a of the drive piston 1. As can be seen particularly clearly in the enlarged illustration in FIG. 3, this enables that the air can be passed past the percussion piston 17 through the air compensation slots 5 if the total length of the percussion piston 7 is within the axial length of the air compensation slots 5.
- the illustration in question shows the moment at which the drive piston 1 has been moved by the connecting rod 14 and the crank mechanism in its left extreme position corresponding to a front dead center. Due to the air spring forming in the cavity 19, the percussion piston 17 is struck forward against the dapper 18, which in turn applies the impact energy forwards the tool, not shown.
- the cavity 19 is in connection with the ambient atmosphere via the air compensation slots 5, but at least with the front end face 1b of the drive piston 1, so that air can flow into the cavity 19 and recharge the air spring.
- the drive piston 1 is then moved to the right by the crank mechanism, as a result of which air is still sucked in via the air compensation slot 5.
- the percussion piston 17 bounces back from the anvil 18 and follows the movement of the drive piston 1 with a certain time delay. In addition, it is sucked back by the negative pressure created in the cavity 19.
- the cavity 19 is sealed off from the environment again, so that the air spring can be formed again when the drive piston 1 moves forward.
- idle openings 6 are formed in a zigzag arrangement in the drive piston 1.
- the idle position is achieved in that the tool is lifted from the material to be machined and the tool can therefore slip out of the hammer somewhat.
- the striker 18 follows the movement of the tool and moves into the left or front extreme position shown in the figures. This also applies to the percussion piston 17, so that the percussion piston 17 passes over a control edge 20 of a ventilation channel 21 which is formed in the guide tube 16 and extends in the axial direction and has a rear edge 17a located on its rear end face.
- the ventilation openings 6 enable a connection between the cavity 19 and the surroundings practically exactly at the time when the percussion piston rear edge 17a passes over the control edge 20, as a result of which the cavity 19 is ventilated and effective pressure build-up is no longer possible.
- the striking mechanism is idling. Only when the tool is replaced and thus the striker 18 and the striking piston 17 moved back can the control edge 20 be run over again by the striking piston rear edge 17a, as a result of which the connection between the cavity 19 and the ventilation duct 21 is interrupted. The striking mechanism then starts operating again.
- the rotary hammer shown can also exert a rotary movement on the tool.
- a bevel pinion 22, which meshes with a bevel gear 23, is shrunk on the crankshaft.
- the rotational movement of the bevel gear 23 is transmitted via a safety coupling 24 known per se to a vertical shaft 25, from where it is forced onto the tool in a manner which is not shown but is known.
- the air compensation slots 5 provided according to the invention replace the previously used air compensation pockets on the inner wall of the guide sleeve la. This makes it possible to minimize the wall thickness of the guide sleeve la and therefore to save considerable weight, which has an advantageous effect on the vibration behavior of the striking mechanism when idling. Will continue Material saved during production, which can reduce manufacturing costs.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Percussive Tools And Related Accessories (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19828426A DE19828426C2 (de) | 1998-06-25 | 1998-06-25 | Antriebskolben mit geringer Wandstärke für ein Luftfederschlagwerk |
DE19828426 | 1998-06-25 | ||
PCT/EP1999/004415 WO1999067064A1 (de) | 1998-06-25 | 1999-06-24 | Luftfederschlagwerk mit antriebskolben mit geringer wandstärke |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1089855A1 true EP1089855A1 (de) | 2001-04-11 |
EP1089855B1 EP1089855B1 (de) | 2002-04-10 |
Family
ID=7872052
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99931180A Expired - Lifetime EP1089855B1 (de) | 1998-06-25 | 1999-06-24 | Luftfederschlagwerk mit antriebskolben mit geringer wandstärke |
Country Status (6)
Country | Link |
---|---|
US (1) | US6237700B1 (de) |
EP (1) | EP1089855B1 (de) |
JP (1) | JP4862124B2 (de) |
DE (2) | DE19828426C2 (de) |
ES (1) | ES2174622T3 (de) |
WO (1) | WO1999067064A1 (de) |
Families Citing this family (16)
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 |
DE10145464C2 (de) * | 2001-09-14 | 2003-08-28 | Wacker Construction Equipment | Bohr- und/oder Schlaghammer mit anpressdruckabhängiger Leerlaufsteuerung |
DE10204861B4 (de) * | 2002-02-06 | 2004-01-29 | Wacker Construction Equipment Ag | Luftfederschlagwerk mit elektrodynamisch bewegtem Antriebskolben |
DE602004026243D1 (de) * | 2003-05-09 | 2010-05-12 | Makita Corp | Elektrowerkzeug |
DE10333799B3 (de) * | 2003-07-24 | 2005-02-17 | Wacker Construction Equipment Ag | Hohlkolbenschlagwerk mit Luftausgleichs- und Leerlauföffnung |
GB0428210D0 (en) * | 2004-12-23 | 2005-01-26 | Black & Decker Inc | Mode change mechanism |
DE102005028918A1 (de) * | 2005-06-22 | 2006-12-28 | Wacker Construction Equipment Ag | Bohr- und/oder Schlaghammer mit Leerlaufsteuerung |
GB0713432D0 (en) * | 2007-07-11 | 2007-08-22 | Black & Decker Inc | Rotary hammer-chain drive |
DE102007000488A1 (de) * | 2007-09-12 | 2009-03-19 | Hilti Aktiengesellschaft | Handwerkzeugmaschine mit Luftfederschlagswerk, Linearmotor und Steuerverfahren |
DE102009026542A1 (de) | 2009-05-28 | 2010-12-09 | Hilti Aktiengesellschaft | Werkzeugmaschine |
CN102069476B (zh) * | 2009-11-19 | 2013-03-13 | 南京德朔实业有限公司 | 动力榔头 |
US8636081B2 (en) | 2011-12-15 | 2014-01-28 | Milwaukee Electric Tool Corporation | Rotary hammer |
WO2015133198A1 (ja) * | 2014-03-03 | 2015-09-11 | 日立工機株式会社 | 打撃工具 |
WO2019079560A1 (en) | 2017-10-20 | 2019-04-25 | Milwaukee Electric Tool Corporation | PERCUSSION TOOL |
WO2019147919A1 (en) | 2018-01-26 | 2019-08-01 | Milwaukee Electric Tool Corporation | Percussion tool |
JP7412135B2 (ja) * | 2019-11-05 | 2024-01-12 | 株式会社マキタ | 打撃工具 |
Family Cites Families (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1628045B2 (de) * | 1967-01-13 | 1974-01-10 | Robert Bosch Gmbh, 7000 Stuttgart | Hammergerät mit einem quer zur Schlagrichtung eingebauten Antriebsmotor |
US3688848A (en) * | 1971-03-15 | 1972-09-05 | Black & Decker Mfg Co | Air spring bleed assembly |
JPS5750218Y2 (de) * | 1977-12-16 | 1982-11-02 | ||
JPS5495501A (en) * | 1978-01-06 | 1979-07-28 | Asahi Chem Ind Co Ltd | Preparation of unsaturated glycols |
US4290492A (en) * | 1979-01-31 | 1981-09-22 | Black & Decker Inc. | Idling and air replenishing system for a reciprocating hammer mechanism |
ATE11750T1 (de) * | 1980-11-18 | 1985-02-15 | Black & Decker Inc. | Schlagbohrgeraet. |
DE3316013A1 (de) | 1983-05-03 | 1984-11-08 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Bohrhammer mit einem pneumatischen betaetigten schlagkoerper |
DE3423919A1 (de) | 1984-06-29 | 1986-01-09 | Robert Bosch Gmbh, 7000 Stuttgart | Bohrhammer |
EP0307551A2 (de) * | 1987-06-22 | 1989-03-22 | HENKEL CORPORATION (a Delaware corp.) | Als Überzüge und Druckfarben verwendbare, Riechstoff enthaltende Polyamidharze |
JPS6420277U (de) * | 1987-07-24 | 1989-02-01 | ||
DE3826213A1 (de) * | 1988-08-02 | 1990-02-15 | Bosch Gmbh Robert | Bohr- oder schlaghammer |
ZA908924B (en) * | 1990-01-15 | 1991-08-28 | Sulzer Ag | A percussion device |
DE4239294A1 (de) * | 1992-11-23 | 1994-05-26 | Black & Decker Inc | Bohrhammer mit pneumatischem Schlagwerk |
SE506083C2 (sv) * | 1995-07-06 | 1997-11-10 | Berema Atlas Copco Ab | Pneumatiskt slagverktyg |
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 |
JP3900379B2 (ja) * | 1996-11-12 | 2007-04-04 | 日東工器株式会社 | 空圧式打撃工具 |
-
1998
- 1998-06-25 DE DE19828426A patent/DE19828426C2/de not_active Expired - Fee Related
-
1999
- 1999-06-24 US US09/622,546 patent/US6237700B1/en not_active Expired - Lifetime
- 1999-06-24 WO PCT/EP1999/004415 patent/WO1999067064A1/de active IP Right Grant
- 1999-06-24 DE DE59901204T patent/DE59901204D1/de not_active Expired - Lifetime
- 1999-06-24 ES ES99931180T patent/ES2174622T3/es not_active Expired - Lifetime
- 1999-06-24 JP JP2000555733A patent/JP4862124B2/ja not_active Expired - Fee Related
- 1999-06-24 EP EP99931180A patent/EP1089855B1/de not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9967064A1 * |
Also Published As
Publication number | Publication date |
---|---|
JP2002518197A (ja) | 2002-06-25 |
DE19828426A1 (de) | 2000-01-13 |
WO1999067064A1 (de) | 1999-12-29 |
JP4862124B2 (ja) | 2012-01-25 |
DE19828426C2 (de) | 2003-04-03 |
EP1089855B1 (de) | 2002-04-10 |
US6237700B1 (en) | 2001-05-29 |
ES2174622T3 (es) | 2002-11-01 |
DE59901204D1 (de) | 2002-05-16 |
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