WO1999056917A1 - Schlagwerk für ein schlagend oder drehschlagend arbeitendes werkzeug - Google Patents
Schlagwerk für ein schlagend oder drehschlagend arbeitendes werkzeug Download PDFInfo
- Publication number
- WO1999056917A1 WO1999056917A1 PCT/EP1999/002977 EP9902977W WO9956917A1 WO 1999056917 A1 WO1999056917 A1 WO 1999056917A1 EP 9902977 W EP9902977 W EP 9902977W WO 9956917 A1 WO9956917 A1 WO 9956917A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cavity
- inner rotor
- percussive
- percussion piston
- control channel
- 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.)
- Ceased
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
Definitions
- the invention relates to a percussion mechanism for a percussive or rotary percussion working tool with a rotatingly driven external rotor and an internal rotor arranged axially parallel and eccentrically, rotatingly driven at a relative speed to the external rotor, in the cavity of which a reciprocating piston is guided, whereby One or more control channels open into the cavity, which are alternately connected during the rotation to a compression space and suction space which form between the outer contour of the inner rotor and the inner contour of the outer rotor.
- Such a striking mechanism is identified as known in DE 42 16 071 A1.
- an inner rotor rotates at a relative speed in an outer rotor, the two axes of rotation of the inner rotor and outer rotor being arranged parallel and eccentrically to one another.
- a cavity is formed in the inner rotor, in which a percussion piston is displaceably guided.
- At least one control channel opens into the cavity near its axial ends, and the control channels located at the opposite ends are alternately connected during rotation to a compression chamber and suction chamber which form between the outer contour of the inner rotor and the inner contour of the outer rotor.
- the invention has for its object to develop a percussion mechanism of the type mentioned in such a way that a substantial increase in performance is achieved with a smaller design, higher functional reliability, simple drive and simple structure.
- a spring mechanism is formed which stores the kinetic energy of the returning percussion piston and, when the direction of movement of the percussion piston reverses, releases the stored energy for moving the percussion piston in the forward direction thereof.
- the energy storage and retransfer to the percussion piston is advantageously achieved in that the spring mechanism is formed by means of an air column located in the rear section of the cavity and compressed during the backward movement of the percussion piston. This also results in good vibration damping during impact operation.
- the spring mechanism is formed by means of a metallic spring. Other spring mechanisms, e.g. with plastic or rubber elements are conceivable.
- Pressing in compressed air during the forward movement in addition to the spring action can be effected in that the air from the compression space through at least one control channel on the facing partial surface of the outer contour of the inner rotor in front of or behind the percussion piston or one - 4 -
- a pulse-like pressing and suction effect by the compressed air in the cavity of the inner rotor can be generated in that a fixed sleeve, which is concentric with the axis of rotation of the inner rotor and is fitted into the cavity, is arranged in the rotating inner rotor, which sleeve fits onto the at least one control channel and the at least one further control channel has matched holes.
- FIG. 1 shows a hammer mechanism installed in a hammer drill in cross section with a control channel in the front region of the cavity
- FIG. 2 shows a hammer mechanism similar to that in FIG. 1, but a control channel is additionally provided in the rear region of the cavity,
- FIG. 3 shows a further exemplary embodiment of a striking mechanism in cross section, in which a fixed sleeve with a bore that can be brought into register with the control channels is provided in the cavity of an inner rotor, - 5 -
- FIG. 3a shows a modified embodiment of the striking mechanism according to FIG. 3 with a fixed sleeve
- Fig. 4 shows another embodiment of a hammer mechanism, in which only a control bore in the front portion of the cavity and a fixed sleeve with a corresponding bore are provided, and
- Fig. 5 shows another embodiment of the striking mechanism, in which a pressure plate is provided at the end of the cavity of the inner rotor.
- a striking mechanism is shown in longitudinal section and in cross section, the basic function of which largely corresponds to the striking mechanism according to DE 42 16 071 A1 from the same applicant.
- the volume of chambers 3 and 4 formed between them alternately changes in size when an inner rotor 1.1 and an outer rotor 2.1 rotate.
- the air flows alternately from the chamber 3 via one or more control channels 5.1 and 6 through one or more ring channels 7 in the percussion piston 1 1 .1 via one or more control channels - 6 -
- the resulting excess pressure in the chamber 13 accelerates the percussion piston 1 1 .1 backwards.
- the air is compressed in a further chamber 15.1.
- the percussion piston 1 1.1 is braked in its backward movement, stopped and accelerated forward.
- the percussion piston 1 1.1 transmits its kinetic energy as impact energy to the tool via the firing pin 10.
- the process can start again.
- the striking process ends when the machine is switched off or the percussion piston 1 1.1 moves forward and the connection between the chambers 3 and 4 is re-established via his or her ring channels 7 and thus reaches the idle stroke.
- Air losses in the further chamber 15.1 can be compensated for by means of a check valve 19 and / or a ventilation hole 16.1.
- one or more further check valves 20 (cf. FIG. 2) and / or one or more further ventilation bores 16 and / or - 7 -
- a chamber 1 1 .1 .1 located in front of the percussion piston 1 1 .1 changes in volume during the reciprocating movement of the percussion piston 1 1 .1 and can be ventilated and vented with one or more channels 18. In order to compensate for air losses in chamber 1 5.1, lost air can be returned via one or more check valves.
- at least one seal 21 should be attached between the axial sealing parts 1 .1 .2 and 1 .1 .3 and the outer rotor 2.1; sealing strips 1 .1 .1 should be attached in the inner rotor 1 .1.
- the sealing strips 1 .1 .1 can also be supported with resilient elements.
- a planetary gear 22.1 .1 (special tungsten gear) can be used to drive the drilling shaft 22.1.
- the sleeve freewheel 22.1 .2 allows a rotary movement of the drilling shaft 22.1 and thus a power transmission for drilling operation only in one direction of rotation of the motor. If the motor rotates in the other direction, the sleeve freewheel 22.1.2 runs freely, and the drilling shaft 22.1 stops for chiseling. In addition, the drilling shaft 22.1 can still be locked in any position.
- the drive and / or the 2: 1 ratio of the outer rotor 2.1 and the inner rotor 1 .1 can be realized with a countershaft 23.
- the toothing of the countershaft should have an integer module 1 or 2 etc.
- axial bearings 24.1 .1 to 24.1 .4 can be used, which compensate for the temperature expansion with a preload of one or more spring elements, such as disc springs.
- Fig. 2 shows a striking mechanism similar in function, as specified in DE 42 1 6 071 A.
- a resilient element 1 5.2 at the rear end which in the present case is designed as an air spring.
- FIG. 3 shows a further striking mechanism.
- this striking mechanism there is a non-rotating component 1 .3 in the inner rotor, e.g. B. a sleeve in the form of a cylinder tube, in which a resilient element 1 5.3.2, e.g. also an air spring, is formed.
- the air from the chambers 3 and 4 only flows into the chamber 27 and / or 28 when the bores 5.3 and / or 9.3 of the rotating inner rotor overlap with the bores 5.3.1 and / or 9.3.1 of the stationary component 1 .3 .
- an overpressure and / or a vacuum is alternately generated in the chambers 3 and 4. Since the overpressure and / or the underpressure in the chambers 3 and 4 can be higher, the speed of the percussion piston can also be increased.
- This design can be applied to all of the methods described here according to FIGS. 1 to 5.
- the tubular component located in the inner rotor 1 .1 can also be mounted in a rotating manner instead of being fixed, its speed being in a fixed ratio to the speed of the inner rotor 1 .1 and the outer rotor 2.1 and being driven, for example, by the same rotating mechanism.
- the rotating component can function as a drilling shaft.
- FIG. 3a shows a modification of the striking mechanism according to FIG. 3 with only one bore or one control channel 5.3 as shown in FIG. 1.
- both the inflow and the outflow due to the fixed bore 5.3.1 are superimposed in a pulsed manner over the same control channel 5.3 arranged on the side facing the tool. In doing so, - 9 -
- one of the two fixed bores is designed as a fixed outflow channel 5.3.1 'and is offset in the circumferential direction against the direction of rotation relative to the diametrical opposite side of the other fixed bore 5.3.1, which in turn is designed as a fixed inflow channel .
- 3c is an enlarged cross-sectional view of this structure.
- FIG. 4 shows an impact mechanism according to FIG. 3, but with only one control channel 5.4. - 10 -
- FIG. 5 shows an impact mechanism according to FIG. 1, in which, however, a pressure plate 26 is arranged at the rear end of the cavity 15.5 of the inner rotor 1 .1. With their help, it is possible to produce a mass balance movement to the percussion piston 1 1. This can be done via a deflection, not shown here, which results from the backward movement of the pressure plate 26, a forward movement of a balancing mass, e.g. of the engine.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Percussive Tools And Related Accessories (AREA)
Abstract
Description
Claims
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP99923508A EP1089856A1 (de) | 1998-05-05 | 1999-05-03 | Schlagwerk für ein schlagend oder drehschlagend arbeitendes werkzeug |
| AU40360/99A AU4036099A (en) | 1998-05-05 | 1999-05-03 | Percussive mechanism for a percussive or rotary percussive tool |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19819914.7 | 1998-05-05 | ||
| DE19819914 | 1998-05-05 | ||
| DE29815770U DE29815770U1 (de) | 1998-05-05 | 1998-09-02 | Schlagwerk für ein schlagend oder drehschlagend arbeitendes Werkzeug |
| DE29815770.5 | 1998-09-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1999056917A1 true WO1999056917A1 (de) | 1999-11-11 |
Family
ID=26045952
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP1999/002977 Ceased WO1999056917A1 (de) | 1998-05-05 | 1999-05-03 | Schlagwerk für ein schlagend oder drehschlagend arbeitendes werkzeug |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1089856A1 (de) |
| AU (1) | AU4036099A (de) |
| WO (1) | WO1999056917A1 (de) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7705497B2 (en) | 2004-12-23 | 2010-04-27 | Black & Decker Inc. | Power tool cooling |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4216071A1 (de) * | 1992-05-15 | 1993-11-18 | Rolf Briem | Verfahren und Vorrichtung zum Betätigen eines Schlagwerkzeuges mittels Preßluft |
-
1999
- 1999-05-03 EP EP99923508A patent/EP1089856A1/de not_active Withdrawn
- 1999-05-03 WO PCT/EP1999/002977 patent/WO1999056917A1/de not_active Ceased
- 1999-05-03 AU AU40360/99A patent/AU4036099A/en not_active Abandoned
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4216071A1 (de) * | 1992-05-15 | 1993-11-18 | Rolf Briem | Verfahren und Vorrichtung zum Betätigen eines Schlagwerkzeuges mittels Preßluft |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7705497B2 (en) | 2004-12-23 | 2010-04-27 | Black & Decker Inc. | Power tool cooling |
Also Published As
| Publication number | Publication date |
|---|---|
| AU4036099A (en) | 1999-11-23 |
| EP1089856A1 (de) | 2001-04-11 |
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