EP1633533A1 - Electric hand tool - Google Patents
Electric hand toolInfo
- Publication number
- EP1633533A1 EP1633533A1 EP03775100A EP03775100A EP1633533A1 EP 1633533 A1 EP1633533 A1 EP 1633533A1 EP 03775100 A EP03775100 A EP 03775100A EP 03775100 A EP03775100 A EP 03775100A EP 1633533 A1 EP1633533 A1 EP 1633533A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bearing
- machine according
- bracket
- arms
- bearing shell
- 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
- 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
- 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
-
- 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
- B25D2211/06—Means for driving the impulse member
- B25D2211/061—Swash-plate actuated impulse-driving mechanisms
Definitions
- the invention relates to an electric hand machine tool, in particular a rotary hammer or an impact drill, according to the preamble of claim 1.
- the gear shaft forming part of a countershaft gear is rotatably accommodated in the housing by means of two ball bearings, which are shrunk onto an end section of the gear shaft with their inner bearing ring.
- the outer bearing ring of the ball bearing is pressed into a bearing shell.
- One of the bearing shells is formed in the housing and the other of the bearing shells in an intermediate flange held in the housing.
- Each bearing shell has an annular shoulder on which the outer bearing ring is placed when the ball bearing is pressed into the bearing shell for its correct positioning.
- the electric hand machine tool according to the invention with the features of claim 1 has the advantage that the sliding seat of the radial bearing provided according to the invention in the bearing shell means that the gear shaft with radial bearing is easy to assemble and can then be axially fixed in the housing without tools by means of the clamping bracket provided according to the invention.
- An axial stop provided on the bearing shell specifies the correct position.
- the clamping bracket is an inexpensive component and enables a compact construction of the drive gear.
- the clamping bracket is designed to be resilient and can be pushed onto the bearing shell transversely to the axis of the gear shaft in such a way that the outer bearing ring of the radial bearing overlaps on its one end ring surface and is pressed with its other end ring surface against an axial stop formed on the bearing shell ,
- the clamping bracket resilient in the axial direction of the Get ⁇ ebewelle serves as a lever during assembly and enables a low assembly force with high axial clamping force, since the high clamping force is only reached shortly before the end position of the clamping bracket is reached.
- the tensioning bracket has two spring-elastic bracket arms, which can be inserted with their free end sections axially immovably into two first counter bearings formed on the bearing shell, and a cross part integrally connecting the two bracket arms to the other arm ends, which in one the bearing shell formed second counter bearing is axially immovable.
- the bow arms are flat and are provided in at least one arm section with a bulge directed transversely to the bow arm plane.
- the bracket arms run parallel to one another and each have a guide web extending in the longitudinal direction.
- the guide webs can be inserted into parallel longitudinal grooves that are diametrically opposite one another on the bearing shell and extend transversely to the bearing axis.
- FIG. 3 is a partial perspective top view of the clamping bracket and intermediate flange of the hammer drill in FIG. 1,
- Fig. 4 is a partial plan view of a modified
- the drill hammer shown in detail in FIG. 1 in longitudinal section as an exemplary embodiment for a general electric hand machine tool has a housing 10 with an inner housing shell 11 and an outer one
- housing shell 12 and with an intermediate flange 13 In the interior of the housing 10, an electric motor with an output shaft 14 is received in a known manner, which drives a rotary sleeve 16 in a rotary manner and a percussion mechanism 17 in a translatory manner via a drive gear 15.
- the rotating sleeve 16 is coupled to a tool holder in which a tool, e.g. a hammer drill is clamped, which is carried in the direction of rotation by the tool holder and can perform a limited reciprocating displacement movement in the tool holder.
- a tool e.g. a hammer drill
- the striking mechanism 17 has a drive piston 18 which is axially displaceably guided in the rotating sleeve 16 and a drive piston 18 which is not shown here and which can be acted upon by the drive piston 18 via an air cushion and which delivers its impact energy to the tool held in the tool holder.
- a complete representation and description of the tool holder with tool and the striking mechanism 17 can be found in DE 28 20 128 A1.
- Both the rotational rotary movement of the rotating sleeve 16 and the translatory movement of the drive piston 18 are derived from the output shaft 14 of the electric motor by means of an intermediate shaft 20.
- a drive pinion 19 is formed on the output shaft 14, which meshes with a gear wheel pressed onto the intermediate shaft 20, here called intermediate gear 22.
- the output shaft 14 is received with its shaft section immediately adjacent to the drive pinion 19 in a ball bearing 21 which is fixed in the intermediate flange 13.
- the intermediate shaft 20 carries a countershaft pinion 23 in a rotationally fixed manner, which meshes with a countershaft gear (not shown here), which in turn engages in a ring gear formed on the rotating sleeve 16.
- the striking mechanism 17 is driven by the intermediate shaft 20 via a pendulum gear 24.
- the known pendulum gear 24 has, in the exemplary embodiment shown, a drive bearing 25 designed as a ball bearing, which is either non-rotatably seated on the intermediate shaft 20 or is loosely pushed on and can then be connected to the intermediate shaft 20 by means of a coupling for taking over the rotation.
- the drive bearing 25, which consists of an inner bearing body 251 and an outer bearing ring 252 with balls 253 arranged between them, is placed with its inner bearing body 252 on the intermediate shaft 20 and is designed such that the bearing axis forms an acute angle with the axis of the intermediate shaft 20.
- the outer bearing ring 252 of the drive bearing 25 carries a radially projecting driver pin 26 which engages with play in a transverse bore of a pivot pin 27.
- the pivot pin 27 is held in a fork-like end of the drive piston 18.
- the intermediate shaft 20 is rotatably supported in the housing 10 by means of two radial bearings.
- the radial bearing 28 on the left in FIG. 1 is designed as a needle bearing which is received in a corresponding bearing receptacle 29 of the housing 10.
- the radial bearing 30, which has an inner bearing ring 301 and an outer bearing ring 302 with balls 303 held between them, is pressed onto the intermediate shaft 20 with its inner bearing ring 301 and lies with its outer bearing ring 302 with a sliding seat in a bearing shell 31 formed integrally with the intermediate flange 13 and is held axially immovably in the bearing shell 31 by means of a clamping bracket 32 fixed to the bearing shell 31 or the intermediate flange 13.
- the spring-elastic clamping bracket 32 is - as can be seen in FIGS.
- the tensioning bracket 32 which can be seen in plan view in FIG. 2 and in perspective in FIG. 3, has two spring-elastic bracket arms 321, 322, which are attached to one end of the arm by a one-piece cross member 323 are connected.
- the bracket arms 321, 322 are flat and each have a bulge 324 directed transversely to the bracket arm plane in order to increase their clamping force in one arm cut.
- the bow arms 321, 322 run at an acute angle to one another approximately V-shaped, while their free end sections 321 ', 322' are aligned parallel to one another.
- the transverse part 323 is angled twice on its transverse edge towards the underside, so that a "U" is formed, the U-leg lying on the underside of which forms an underlap web 323 'which is integral with the transverse part 323.
- the spring force of the bulges 324 is pressed onto the bearing shell 31 and shifted further until the engagement ridge 323 'engages behind the undercut of the second counter bearing 35 (FIGS. 1 and 3).
- the tensioning bracket 42 which is also designed to be resilient here, has two resilient bracket arms 421, 422 which are connected in one piece to a cross part 423 at one arm end.
- the bracket arms 421, 422 run parallel to one another and each carry a guide web 421 ′ formed by U-bending their longitudinal edges and extending parallel to the longitudinal axis of the clamping bracket 42. or 422 'and an inwardly projecting, wide spring arm 421 “or 422” which is prestressed transversely to the clamping bracket plane.
- the design of the bearing shell 31 in the intermediate flange 13 is modified such that, instead of the counterbearing on the bearing shell 31, two longitudinal grooves 43, 44 (FIG. 5) which run parallel to the axis of the intermediate shaft 20 and into which the bracket arms 421, 422 are provided are provided can be inserted with their guide webs 421 ', 422'. If the clamping bracket 42 with its bracket arms 421, 422 is inserted into these longitudinal grooves 43, 44, then the spring arms 421 “and 422” axially press onto the outer bearing ring 302 of the radial bearing 30 and press the radial bearing 30 against it as in FIG. 1 formed on the bearing shell 31 annular shoulder 311.
- the invention is not limited to the hammer drill described. It can be used in any electric hand machine tool in which a gear shaft is rotatably supported by means of a radial bearing, for example in drilling machines, sawing machines, electric planes and the like.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mounting Of Bearings Or Others (AREA)
- Percussive Tools And Related Accessories (AREA)
- Jigs For Machine Tools (AREA)
- Drilling And Boring (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10312981A DE10312981A1 (en) | 2003-03-24 | 2003-03-24 | Electric hand tool |
PCT/DE2003/003626 WO2004085118A1 (en) | 2003-03-24 | 2003-10-31 | Electric hand tool |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1633533A1 true EP1633533A1 (en) | 2006-03-15 |
EP1633533B1 EP1633533B1 (en) | 2014-03-19 |
Family
ID=32946092
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03775100.5A Expired - Lifetime EP1633533B1 (en) | 2003-03-24 | 2003-10-31 | Electric hand tool |
Country Status (5)
Country | Link |
---|---|
US (1) | US7036607B2 (en) |
EP (1) | EP1633533B1 (en) |
CN (1) | CN100352612C (en) |
DE (1) | DE10312981A1 (en) |
WO (1) | WO2004085118A1 (en) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1728596B1 (en) * | 2005-06-02 | 2009-02-11 | Makita Corporation | Power tool |
DE102005041447A1 (en) * | 2005-08-31 | 2007-03-01 | Robert Bosch Gmbh | Hammer drill, comprises intermediate shaft designed as plain cylindrical element holding driving wheel, driven wheel, and slide bearing |
DE102006029363A1 (en) * | 2006-06-27 | 2008-01-03 | Robert Bosch Gmbh | Electric hand tool |
CN2920563Y (en) * | 2006-07-11 | 2007-07-11 | 王文江 | Light single-span four function electric hammer |
DE102007050549A1 (en) * | 2007-10-23 | 2009-04-30 | Robert Bosch Gmbh | Hand tool |
CN201201225Y (en) * | 2008-05-20 | 2009-03-04 | 东莞群胜粉末冶金有限公司 | Impact switching mechanism of impact drill |
DE102009027560A1 (en) * | 2009-07-09 | 2011-01-13 | Robert Bosch Gmbh | Hammer drill and / or chisel device |
DE102009054927A1 (en) * | 2009-12-18 | 2011-06-22 | Robert Bosch GmbH, 70469 | Hand tool machine, in particular cordless hand tool machine |
CN101758486B (en) * | 2010-01-21 | 2011-09-28 | 浙江海王电器有限公司 | Light single-button multifunctional electric hammer |
US8636081B2 (en) | 2011-12-15 | 2014-01-28 | Milwaukee Electric Tool Corporation | Rotary hammer |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH356396A (en) | 1960-07-13 | 1961-08-15 | Duss Friedrich Fa | Device on an electric hand drill to optionally change the latter for rotary drilling and percussion drilling |
DE1628045B2 (en) * | 1967-01-13 | 1974-01-10 | Robert Bosch Gmbh, 7000 Stuttgart | Hammer device with a drive motor installed transversely to the direction of impact |
DE2252951B2 (en) * | 1972-10-28 | 1981-09-10 | Robert Bosch Gmbh, 7000 Stuttgart | Hammer drill |
DE2820128A1 (en) | 1978-05-09 | 1979-11-22 | Bosch Gmbh Robert | CRAFT MACHINE |
DE3504650C2 (en) * | 1985-02-12 | 1994-01-20 | Bosch Gmbh Robert | Hammer drill with increased actuation force for the coupling of the impact drive |
DE3506695A1 (en) * | 1985-02-26 | 1986-08-28 | Robert Bosch Gmbh, 7000 Stuttgart | DRILLING HAMMER |
DE3807078A1 (en) * | 1988-03-04 | 1989-09-14 | Black & Decker Inc | DRILLING HAMMER |
DE3919936A1 (en) | 1989-06-19 | 1990-12-20 | Bosch Gmbh Robert | DRILLING HAMMER |
JP3292969B2 (en) * | 1995-08-18 | 2002-06-17 | 株式会社マキタ | Hammer drill |
DE19540396A1 (en) * | 1995-10-30 | 1997-05-07 | Hilti Ag | Drilling and / or chiseling device |
JP3292972B2 (en) * | 1996-03-29 | 2002-06-17 | 株式会社マキタ | Impact tool |
DE19707588B4 (en) * | 1997-02-26 | 2005-08-18 | Robert Bosch Gmbh | Machine tool, in particular drill or impact drill or hammer drill |
DE19717712A1 (en) * | 1997-04-18 | 1998-10-22 | Black & Decker Inc | Hammer drill |
JP2000237976A (en) * | 1999-02-19 | 2000-09-05 | Hitachi Koki Co Ltd | Cordless hammer drill |
TW417558U (en) * | 1999-03-09 | 2001-01-01 | Best Power Tools Co Ltd | Cylinder device of a pneumatic tool |
DE10111748A1 (en) * | 2001-03-12 | 2002-09-19 | Hilti Ag | Switchgear for a combined hand tool |
-
2003
- 2003-03-24 DE DE10312981A patent/DE10312981A1/en not_active Ceased
- 2003-10-31 WO PCT/DE2003/003626 patent/WO2004085118A1/en active Application Filing
- 2003-10-31 CN CNB2003801102093A patent/CN100352612C/en not_active Expired - Lifetime
- 2003-10-31 EP EP03775100.5A patent/EP1633533B1/en not_active Expired - Lifetime
- 2003-10-31 US US10/510,023 patent/US7036607B2/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO2004085118A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN100352612C (en) | 2007-12-05 |
US20050126801A1 (en) | 2005-06-16 |
WO2004085118A1 (en) | 2004-10-07 |
EP1633533B1 (en) | 2014-03-19 |
US7036607B2 (en) | 2006-05-02 |
DE10312981A1 (en) | 2004-10-07 |
CN1758989A (en) | 2006-04-12 |
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