CN101903134B - Hand-held machine tool - Google Patents
Hand-held machine tool Download PDFInfo
- Publication number
- CN101903134B CN101903134B CN200880122293.3A CN200880122293A CN101903134B CN 101903134 B CN101903134 B CN 101903134B CN 200880122293 A CN200880122293 A CN 200880122293A CN 101903134 B CN101903134 B CN 101903134B
- Authority
- CN
- China
- Prior art keywords
- unit
- hand held
- held power
- machine
- power machine
- 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 - Fee Related
Links
- 238000009527 percussion Methods 0.000 claims description 22
- 230000005611 electricity Effects 0.000 claims description 3
- 239000003351 stiffener Substances 0.000 claims description 3
- 230000003116 impacting effect Effects 0.000 abstract description 3
- 238000007906 compression Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000006835 compression Effects 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 230000033001 locomotion Effects 0.000 description 3
- 241001397306 Proales Species 0.000 description 2
- 230000002153 concerted effect Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000003534 oscillatory effect Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006353 environmental stress Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Images
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
- B25D11/06—Means for driving the impulse member
- B25D11/12—Means for driving the impulse member comprising a crank mechanism
- B25D11/125—Means for driving the impulse member comprising a crank mechanism with a fluid cushion between the crank drive and the striking body
-
- 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
- B25D2211/068—Crank-actuated impulse-driving mechanisms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
- B25D2250/035—Bleeding holes, e.g. in piston guide-sleeves
Abstract
The invention relates to a hand-held machine tool (10) having a machine chamber (12), an impacting mechanism unit (14) and a control hole (22), which are arranged in the machine chamber (12); the impacting mechanism unit includes a hammer member unit (16) which is driven by a gas volume (20) via a piston unit (18); and the control hole enables the gas volume (20) to be coupled with the machine chamber (12). The hand-held machine tool (10) has at least a device (24) which is configured for increasing the pressure intensity (pM) in the machine chamber (12).
Description
Technical field
The present invention relates to a kind of hand held power machine according to claim 1 preamble.
Background technology
By the known a kind of hand held power machine with described type of machine chamber of DE19810088C1.Arrange a percussion unit that comprises the ram unit in machine chamber, this ram unit can drive by gas volume by piston unit.This gas volume couples with machine chamber in the neutral of percussion unit or in the expansion stage of percussion unit by control hole.
Summary of the invention
The present invention relates to a kind of hand held power machine, it has machine chamber, is arranged in percussion unit and control hole in the machine chamber, this percussion unit comprises the ram unit, this ram unit can drive by gas volume by piston unit, and this control hole couples gas volume and machine chamber.In this respect, " gas " should especially be interpreted as air." control hole " should especially be interpreted as a kind of element that is particularly useful for controlling gas volume by particular arrangement and/or layout in addition, in this respect.In addition, " couple " in this respect and should especially be interpreted as coupling of fluid technique, make the gas of gas volume flow in the machine chamber by this control hole and/or gas volume can be by the gas feed from machine chamber.In addition, " machine chamber " should especially be interpreted as " Transmission Room ", " oil chamber ", " motor chamber " etc. and/or especially be interpreted as a chamber, this chamber under visual angle outwardly, that is to say towards the surrounding environment of hand held power machine and is isolated and for example only be connected with the surrounding environment of hand held power machine by pressure compensator at least basically at least.By corresponding configuration, can avoid directly gas exchange and the comfortableness infringement and the carrying capacity of environment that cause thus between gas volume and the hand held power machine surrounding environment at least.
The present invention proposes, and hand held power machine has at least one device that is provided for improving the pressure in the machine chamber.In this respect " setting " should especially be interpreted as and distinguishingly be equipped with and/or arrange.In service at hand held power machine, piston unit carries out oscillating movement in the guide pipe of hand held power machine.By the compression to gas volume, just in compression stage, the translation energy of piston unit be delivered on the ram unit by gas volume and with the translation of ram unit accelerate to about twice of piston unit speed.Then be the impact process of ram unit on impulse pin or cutter.In each compression process, a small amount of gas leaks into the machine chamber of hand held power machine from discharge chambe.In the common structure of percussion unit, always there is the leakage loss of gas volume, this is especially owing to the high compression of gas volume produces.For the favourable structure of the cost of percussion unit, the leakage loss of gas volume is inevitably, because little machining tolerance can make percussion unit become may causing the higher wearing and tearing of member and/or block than high sealing of costliness and member.Therefore, in this case, the leakage loss of percussion unit can't suppress fully.In order to compensate leakage loss, be provided with the control hole that gas volume and machine chamber are coupled, wherein, the size of control hole and position determine by the effect of gas compensation.Backward between moving period, just in the expansion stage, produce little negative pressure in discharge chambe at piston unit, just less than the pressure of pressure in the machine chamber, it pulls the ram unit backward.Motion backward for piston unit, utilized the reflection of ram unit on impulse pin or cutter on the one hand, utilized on the other hand by the negative pressure of piston unit generation or the resorption power of piston unit, in order to the ram unit is transported to again in the folded back position of in the initial position or back.Therefore piston unit and ram unit axially reciprocally couple by gas volume and constitute the system that can vibrate.This oscillatory system is influenced consumingly by the friction of ram unit.Piston unit act on the ram unit resorption power by the product of pressure difference on the cross section of ram unit and the both sides, ram unit or with machine chamber in pressure p
MAnd the product of the pressure difference between the negative pressure in gas volume or the discharge chambe is formed.In this oscillatory system, negative pressure can not reduce effectively.Yet can be by improving machine chamber pressure p
MImprove making a concerted effort on the ram unit.The result is that the ram unit is more early got back in the folded back position of back in time, and this ram unit can the more of a specified duration and braking more gently by proal piston unit.Maximum pressure descends less and this ram unit earlier is accelerated to higher impact velocity.Then, higher impact energy is transmitted in the impact subsequently of ram unit.Advantageously realize the raising of ram unit speed and the therefore raising of the impact energy of ram unit thus.In addition, by percussion unit configuration according to the present invention, the pressure of gas volume reduces with respect to known hand held power machine, and this causes the percussion unit load to reduce.Thus, additionally reduce the vibration of hand held power machine.
For on realizing from the ram unit to cutter with high impulse and energy transmission, the speed that reaches when impacting of ram unit must be high as much as possible.The required acceleration for this reason of ram unit can advantageously be realized in the following manner: described device is provided for gas is input in the machine chamber.Produce the possibility simple in structure that is used for improving machine chamber pressure thus, its mode is for example outside air to be input in the machine chamber.Pressure improves the raising of making a concerted effort that causes on the ram unit.The ram unit earlier turns back in the folded back position thus, makes maximum pressure descend less and the ram unit earlier is accelerated on higher bump or the collision speed.Therefore, higher impact energy is transmitted in the impact subsequently of ram unit.
Propose in addition, this device can turn on and off.The accurately coordination of freely selecting to have realized vibrational system that pressure improves.Obtain the autotelic raising that meets purpose of impact energy hand held power machine in service thus.
Propose in addition, this device can or mechanically drive by electricity ground.Realize the especially favourable solution of cost thus, because can use simple driving type.
Propose in addition, this device drives by the drive unit of percussion unit at least in part, thus hand held power machine can ground simple in structure and especially cost advantageously make existing parts drives this device in the hand held power machine because use.
Propose in other configuration, the drive unit of percussion unit is configured to eccentric stiffener.Obtain the simple in structure of drive unit and the therefore favourable configuration of cost thus.
If hand held power machine has filter element, this filter element is connected that this device is gone up and before input direction is arranged in machine chamber, can avoid the percussion unit of hand held power machine contaminated and therefore reduce wear and stop the inefficacy of percussion unit so.
Especially surpass atmospheric pressure or atmospheric pressure at least during the pressure of 0.3bar when this device produces in machine chamber hand held power machine in service, realize the speed of ram unit and the raising of impact energy.
Propose in another kind of configuration, this device is a kind of pump.Realize the especially favourable solution that is used for improving pressure of cost thus, because can use simple standard component.
Description of drawings
Obtain other advantages from following description of drawings.Embodiments of the invention shown in the drawings.This accompanying drawing, specification, claim comprise a lot of feature combinations.The technical staff also can meet the destination and consider these features individually and be combined into significant other combination.
The specific embodiment
Fig. 1 illustrates the schematic diagram of the hand held power machine with machine chamber 12 10 that is made of hammer drill.This machine chamber 12 is surrounded by machine case.In this machine chamber 12, be provided with a percussion unit 14 that comprises ram unit 16 and piston unit 18, this ram unit and piston unit in the axial direction before and after ground be received in the guide pipe 32 and can be in this guide pipe axially, two-wayly lead movably.
In service at hand held power machine 10, rotatablely moving of drive unit 26 is transformed into the reciprocating motion of piston unit 18, to be piston unit 18 make back and forth axially reciprocating from initial position to its mode guide pipe 32, and wherein the gas volume 20 in the discharge chambe 38 is alternately compressed and unloads.In piston unit 18 proal processes, between piston unit 18 and ram unit 16, produce superpressure, this superpressure makes ram unit 16 to preacceleration.The ram unit 16 that in guide pipe 32, accelerates by compression pressure with its kinetic energy or impact energy outputs on the cutter 44 by impulse pin 46 or with pulse steering to the cutter 44 that is positioned in the cutter holder 42.In the process that piston unit 18 moves backward, in discharge chambe 38, produce negative pressure, this negative pressure pulls back this ram unit 16.
For realize from ram unit 16 to cutter on 44 with high pulse and energy transmission, this hand held power machine has at least one and is provided for improving pressure p in the machine chamber 12 according to the present invention
MDevice 24.This device 24 is arranged for gas or air is input in the machine chamber 12.In the present embodiment, this device 24 is configured to pump.Preferably, this device 24 surpasses atmospheric pressure or environmental stress p in service generation of hand held power machine 10 in machine chamber 12
AtAt least the pressure p of 0.3bar
MThis device 24 can turn on and off and preferably can electricity ground or mechanically driving.In the present embodiment, this device 24 can pass through drive unit 26 drivings of percussion unit 14 at least in part.At this, the drive unit 26 of percussion unit 14 is configured to eccentric stiffener.This hand held power machine additionally has filter element 28, and this filter element is connected on the device 24 and before input direction is arranged on machine chamber 12.This device 24 that is configured to pump sucks outside airs usually, and this outside air is filtered before therefore in being input to machine chamber 12.
Claims (8)
1. hand held power machine (10), have a machine chamber (12), and be arranged on percussion unit (14), a control hole (22) and at least one device (24) in this machine chamber (12), this percussion unit comprises ram unit (16), this ram unit can drive by gas volume (20) by a piston unit (18), described control hole couples described gas volume (20) and described machine chamber (12), and described device is arranged for the pressure (p that improves in the described machine chamber (12)
M), make the impulse member unit earlier get back in the folded back position of back in time, it is characterized in that described device (24) is a pump that constitutes dividually with described piston unit (18).
2. according to the hand held power machine of claim 1, it is characterized in that described device (24) is arranged for gas is input in the described machine chamber (12).
3. according to the hand held power machine of claim 1 or 2, it is characterized in that described device (24) can turn on and off.
4. according to the hand held power machine of one of aforesaid right requirement, it is characterized in that described device (24) can be by electricity ground or mechanically driving.
5. according to the hand held power machine of claim 4, it is characterized in that the drive unit (26) that described device (24) can pass through described percussion unit (14) at least in part drives.
6. according to the hand held power machine of claim 5, it is characterized in that the described drive unit (26) of described percussion unit (14) is configured to eccentric stiffener.
7. according to the hand held power machine of one of claim 2 to 6, it is characterized in that, be provided with a filter element (28), this filter element is connected to described device (24) and upward and at input direction (30) is arranged in described machine chamber (12) front.
8. according to the hand held power machine of one of aforesaid right requirement, it is characterized in that described device (24) surpasses atmospheric pressure (p in service generation of hand held power machine (10) in described machine chamber (12)
At) pressure (p of 0.3bar at least
M).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102007062246.7 | 2007-12-21 | ||
| DE200710062246 DE102007062246A1 (en) | 2007-12-21 | 2007-12-21 | Hand tool |
| PCT/EP2008/064813 WO2009083304A1 (en) | 2007-12-21 | 2008-10-31 | Circular saw |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101903134A CN101903134A (en) | 2010-12-01 |
| CN101903134B true CN101903134B (en) | 2013-09-11 |
Family
ID=40254446
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200880122293.3A Expired - Fee Related CN101903134B (en) | 2007-12-21 | 2008-10-31 | Hand-held machine tool |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2234770A1 (en) |
| CN (1) | CN101903134B (en) |
| DE (1) | DE102007062246A1 (en) |
| WO (1) | WO2009083304A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102014200393A1 (en) | 2014-01-13 | 2015-07-16 | Metabowerke Gmbh | Percussion unit |
| CA3146951A1 (en) | 2014-03-27 | 2015-10-01 | Techtronic Power Tools Technology Limited | Powered fastener driver and operating method thereof |
| EP3260239A1 (en) | 2016-06-24 | 2017-12-27 | HILTI Aktiengesellschaft | Handheld machine tool |
| EP3632624A1 (en) * | 2018-10-04 | 2020-04-08 | Hilti Aktiengesellschaft | Eccentric drive for a hand-held machine tool |
| CN115256651B (en) * | 2022-06-24 | 2022-12-30 | 永康市灵威电器有限公司 | Electric tool and combination of electric tool and battery pack |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2207962C3 (en) * | 1972-02-21 | 1980-07-10 | Robert Bosch Gmbh, 7000 Stuttgart | Air spring hammer |
| SU1138310A1 (en) * | 1983-05-20 | 1985-02-07 | Всесоюзный Научно-Исследовательский И Проектно-Конструкторский Институт Механизированного И Ручного Строительно-Монтажного Инструмента,Вибраторов И Строительно-Отделочных Машин | Air-spring percussive tool |
| DE8708167U1 (en) * | 1987-06-10 | 1988-10-13 | Robert Bosch Gmbh, 7000 Stuttgart, De | |
| US4932479A (en) * | 1988-05-05 | 1990-06-12 | Vladimir Pyatov | Vacuum-compression type percussion power tool with a pumping chamber |
| DE4238564C2 (en) * | 1992-11-14 | 1995-02-23 | Fein C & E | Power tool |
| JPH09155765A (en) * | 1995-12-01 | 1997-06-17 | Daiko Seimitsu Kk | Explosion proof motor-driven drill |
| DE19810088C1 (en) | 1998-03-10 | 1999-08-26 | Bosch Gmbh Robert | Hammer and boring drill |
-
2007
- 2007-12-21 DE DE200710062246 patent/DE102007062246A1/en not_active Withdrawn
-
2008
- 2008-10-31 EP EP08867377A patent/EP2234770A1/en not_active Withdrawn
- 2008-10-31 WO PCT/EP2008/064813 patent/WO2009083304A1/en active Application Filing
- 2008-10-31 CN CN200880122293.3A patent/CN101903134B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| WO2009083304A1 (en) | 2009-07-09 |
| DE102007062246A1 (en) | 2009-06-25 |
| EP2234770A1 (en) | 2010-10-06 |
| CN101903134A (en) | 2010-12-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130911 Termination date: 20161031 |