EP1012403A1 - Working machine with reduced upper mass vibrations - Google Patents
Working machine with reduced upper mass vibrationsInfo
- Publication number
- EP1012403A1 EP1012403A1 EP98945286A EP98945286A EP1012403A1 EP 1012403 A1 EP1012403 A1 EP 1012403A1 EP 98945286 A EP98945286 A EP 98945286A EP 98945286 A EP98945286 A EP 98945286A EP 1012403 A1 EP1012403 A1 EP 1012403A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- guide
- mass
- upper mass
- crank mechanism
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/046—Improving by compacting by tamping or vibrating, e.g. with auxiliary watering of the soil
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/046—Improving by compacting by tamping or vibrating, e.g. with auxiliary watering of the soil
- E02D3/068—Vibrating apparatus operating with systems involving reciprocating masses
Definitions
- the invention relates to a working device according to the preamble of claim 1.
- the invention relates to a ramming device for soil compaction or a hammer.
- Known tamping devices of this type are constructed in such a way that an upper mass which receives a motor and a crank mechanism is connected via a spring set to a working mass which essentially forms a work or compression plate.
- the rotary movement generated by the engine is converted by the crank mechanism into an oscillating axial movement, which is transferred to the worktop for soil compaction via the spring set.
- the upper mass comprises approximately two thirds and the striking working mass a third of the total tamping mass, while the distances covered by the upper mass and the working mass are in inverse relation to each other.
- the upper mass is of the order of 25 to 30 mm.
- vibrations of the upper mass are transmitted via a guide bracket to the person guiding the implement, which is very uncomfortable, especially when working for long periods. Vibrations in the horizontal or lateral direction are particularly stressful for the operator. In contrast, vibrations in the vertical direction are required for the rammer to work efficiently.
- Fig. 2 shows such a known rammer.
- a drive shaft 1 of the tamper is driven by a motor (not shown), which drives a crank disk 3, which is mounted in the tamper housing and provided with external teeth, via a pinion 2.
- a crank pin 4 is attached to the crank disk 3, on which a connecting rod 5 is rotatably mounted.
- the connecting rod 5 is rotatably connected at its other end to a guide piston 7 by means of a piston pin 6.
- the guide piston 7 carries a piston guide 9 formed by a steel disk and fastened by a nut 8.
- the guide piston 7 can be moved axially back and forth with the piston guide 9 within a guide tube 10 belonging to the undersize.
- This axial direction device corresponds to a vertical or working direction of the device during its use.
- a spring set 11 consisting of several springs is arranged on both sides of the piston guide 9, the springs being supported on their side facing away from the piston guide 9 against spring plates 12 fastened to the guide tube 10.
- a damping sleeve 13 made of an elastic plastic material is placed on the guide piston 7 above the piston guide 9, while a damping plug 14 also made of elastic plastic is attached below the nut 8.
- the damping sleeve 13 and the damping plug 14 can strike strongly associated spring plates 11 with their side facing away from the piston guide 9 against the associated spring plate 12. They then dampen the further compression movement in such a way that block seating of the spring sets 11 and thus excessive impact on the implement can be avoided.
- the guide tube 10 with the spring plates 12 belongs to the working or undersize of the rammer.
- a ramming foot (not shown in FIG. 1) can be attached to the lower mass, which serves for soil compaction.
- the upper mass and the lower mass are connected by an elastic bellows 15.
- the rotary movement of the engine is converted into an oscillating axial movement of the guide piston 7 by the crank mechanism by means of the crank disk 3, the crank pin 4 and the connecting rod 5.
- This axial movement is transmitted via the spring sets 1 1 to the guide tube 10 and thus to the lower mass and can be used for soil compaction.
- a rammer for soil compaction is known, with a working mass that is linearly driven back and forth by a motor belonging to an upper mass via a double crank mechanism.
- two counter-rotating weights are provided, which superimpose an opposing vibration on the vibration generated by the crank mechanism.
- the tamper is designed with two legs, each tamper leg is driven by its own crank drive. Accordingly, the tamper is very large and can only be guided on the ground using great forces.
- a drive device for excitation of vibratable systems is known.
- arms and levers coupled to one another via rubber springs are provided in a crank drive.
- the mass of the arms and levers is kept as low as possible using materials of low specific weight.
- the invention is therefore based on the object of specifying an implement in which vibrations of the upper mass can be avoided as soon as they arise.
- reducing the mass of the moving components also has the advantage of saving energy, since lower masses have to be accelerated and decelerated with each crank revolution.
- the total weight of the device can also be reduced. Due to the lower acceleration load on the drive motor, longer lifetimes can be achieved.
- the running noise can be reduced.
- considerable cost reductions can be expected with the corresponding manufacturing process.
- a significant advantage is the reduction in hand-arm vibrations acting on the operator, which makes working more pleasant.
- the piston guide can be produced in one piece from plastic together with a damping bush, preferably with two damping bushes. In addition to the reduction in mass mentioned, this leads to a simplification of the production process and thus also to a reduction in costs.
- Figure 1 shows a part of a ramming device according to the invention in a sectional view.
- Fig. 2 shows a partial section of a known ramming device.
- the components concerned are the connecting rod 5, the piston pin 6, the guide piston 7 and a piston guide 16 designed according to the invention.
- the crank mechanism itself consists of the crank disk 3, the crank pin 4, the connecting rod 5, the piston pin 6, the guide piston 7 and the piston guide 16 .
- the connecting rod 5 can preferably be made of plastic, for example of carbon fiber or glass fiber reinforced polyamide. Wrought aluminum alloys or glass fiber reinforced polyamide are suitable for the guide piston 7.
- the connecting rod 5 made of plastic has a certain elasticity and thus spring properties. This elasticity is determined by an o-leg shape, ie by an arcuate configuration of the connecting rod 5 between the crank pin 4 located on the crank disc 3 and that on the guide piston 4. ben 7 arranged piston pin 6 supports.
- the connecting rod 5 therefore forms an oval "O", through the center of which the drive shaft 1 extends.
- the lateral legs of the "O” improve the resilience or damping ability of the connecting rod 5, whereby the bearings and toothings as well as other components connected to the connecting rod 5 are protected.
- the piston guide 16 integrates the steel piston guide known from the prior art, the expansion sleeve consisting of an elastic plastic material and the expansion plug in one component.
- the piston guide 16 has a wider edge 17 approximately in the middle, on the two sides of which the spring sets 11 lie.
- a sleeve extends from the edge 17 in both directions, an upper expansion sleeve 18 being slipped over the guide piston 7 and a lower expansion sleeve 19 likewise extending in the form of a sleeve in the direction of the lower mass.
- the ends of the expansion sleeves 18, 19 can strike the respective spring plates 12 in the event of strong swinging before the spring windings touch one another. This prevents excessive shock loads on the device.
- the piston guide 16 In order to ensure a corresponding damping ability by the piston guide 16, it is manufactured in one piece from polyurethane. To reinforce the edge 17, in particular to avoid damage to the piston guide 16 by the spring sets 11 lying thereon, it is possible to insert thin steel disks between the edge 17 and the associated springs 11.
- the piston guide 16 is screwed onto the guide piston 7 via a trapezoidal thread 20.
- the trapezoidal thread 20 ensures a large-area contact between the piston guide 16 and the guide piston 7, so that the local surface pressure can be kept low.
- an internal hexagon 21 is formed in the interior of the lower expansion sleeve 19, into which a steel piece 22 having an external hexagon can be inserted and can be fixed on the guide piston 7 by means of a screw 23.
- This arrangement ensures that the piston guide 16 cannot unscrew automatically from the guide piston 7 during operation of the device.
- the invention was explained above using a ramming device according to the invention for soil compaction.
- the invention can also be used very advantageously in a hammer, for example a percussion hammer, since the impact generation in the hammer is based on the same principle as in the ramming device.
- the fact that an air spring hammer mechanism is usually used in the hammer instead of the steel springs forming the spring sets 11 has no influence on the positive effects of the embodiment according to the invention.
- Weight savings of several kilograms can be achieved by using plastic materials. However, this saved weight can also be added to the upper mass, so that it increases in mass compared to devices known from the prior art. This makes the upper mass quieter during operation, which means that fewer hand-arm vibrations are transmitted to the operator. The total mass of the rammer remains constant compared to the case in which the components in question are made from steel.
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Road Paving Machines (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19739743 | 1997-09-10 | ||
DE19739743A DE19739743C2 (en) | 1997-09-10 | 1997-09-10 | Tool with reduced vibrations of the upper mass |
PCT/EP1998/005392 WO1999013166A1 (en) | 1997-09-10 | 1998-08-25 | Working machine with reduced upper mass vibrations |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1012403A1 true EP1012403A1 (en) | 2000-06-28 |
EP1012403B1 EP1012403B1 (en) | 2004-10-13 |
Family
ID=7841879
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98945286A Revoked EP1012403B1 (en) | 1997-09-10 | 1998-08-25 | Working machine with reduced upper mass vibrations |
Country Status (5)
Country | Link |
---|---|
US (2) | US6848858B1 (en) |
EP (1) | EP1012403B1 (en) |
JP (1) | JP3851084B2 (en) |
DE (2) | DE19739743C2 (en) |
WO (1) | WO1999013166A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2251488A2 (en) | 2009-05-14 | 2010-11-17 | Ammann Verdichtung GmbH | Tamper for soil compaction |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7540336B2 (en) * | 2005-06-02 | 2009-06-02 | M-B-W Inc. | Vibration isolator for a pneumatic pole or backfill tamper |
DE102007048980A1 (en) | 2007-10-12 | 2009-04-23 | Wacker Construction Equipment Ag | Ground ramming device with adaptive drive control |
WO2009094617A1 (en) * | 2008-01-24 | 2009-07-30 | Lord Corporation | Powered construction ground compactor and method of making |
DE102010047943A1 (en) * | 2010-10-08 | 2012-04-12 | Bomag Gmbh | Vibratory rammer with stamper foot |
DE102012214569B3 (en) * | 2012-08-16 | 2013-10-31 | Ford Global Technologies, Llc | Self-pumping air spring- and damper unit for height adjustment of vehicle body relative to wheel suspension of vehicle, has connecting valve and throttle valve, particularly switchable valves, where working space is aerated to atmosphere |
JP6944897B2 (en) * | 2018-03-15 | 2021-10-06 | 酒井重工業株式会社 | Compactor |
CN110630725B (en) * | 2019-09-27 | 2020-12-08 | 玛狮工程机械(合肥)有限公司 | Gear box and battering ram |
Family Cites Families (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE753502C (en) * | 1937-12-07 | 1954-01-04 | Georg Heinrich Schieferstein | Drive device for the excitation of mechanical, technical work performing, vibratory systems |
US2975761A (en) * | 1957-11-29 | 1961-03-21 | William R Fairchild | Driving hammer |
DE1925870A1 (en) * | 1969-05-21 | 1970-11-26 | Vni I P Ki Mechanizirovannogo | Suddenly working rammer |
US3923412A (en) * | 1970-09-23 | 1975-12-02 | Albert Linz | Drive means for vehicle mounted vibratory compactor |
US3703125A (en) * | 1971-08-05 | 1972-11-21 | Richard S Pauliukonis | Plastic actuating cylinder |
US3756735A (en) * | 1971-10-15 | 1973-09-04 | Bopparder Maschinenbau Gmbh | Vibration tamper |
DE2236371C2 (en) * | 1972-07-25 | 1977-02-24 | Losenhansen Maschinenbau Ag | HAND-HELD TAMPER |
US3807067A (en) * | 1972-12-18 | 1974-04-30 | K Cloud | Automatic trench filler and tamper |
DE2311723C2 (en) * | 1973-03-09 | 1975-03-06 | Helmut 7712 Blumberg Darda | Hydraulically operated device for the mechanical dismantling of rock |
US4067244A (en) * | 1974-12-16 | 1978-01-10 | Losenhausen Maschinenbau Ag | Self-propelled vibratory plate |
DE2554013C3 (en) * | 1975-12-01 | 1984-10-25 | Koehring Gmbh - Bomag Division, 5407 Boppard | Process for dynamic soil compaction |
DE2928870A1 (en) * | 1979-07-17 | 1981-02-12 | Koehring Gmbh Bomag Division | MASS COMPENSATED PAMPING AND / OR BLOWING SYSTEM |
US4320924A (en) * | 1980-05-16 | 1982-03-23 | Elco International | Reciprocated concrete surfacer member with shielded spring return |
US4557336A (en) * | 1982-09-23 | 1985-12-10 | Stone Construction Equipment, Inc. | Alignment mechanism for ram type compactors |
GB8503535D0 (en) * | 1985-02-12 | 1985-03-13 | Secretary Trade Ind Brit | Fibre reinforced plastics connecting rod |
US4738339A (en) * | 1985-03-08 | 1988-04-19 | Tayco Developments, Inc. | Energy absorber device with composite plastic casing having high strength inner cylinder |
DE3532174A1 (en) | 1985-09-10 | 1987-03-19 | Wacker Werke Kg | Tamping device for soil compaction |
JP2551927Y2 (en) * | 1991-06-17 | 1997-10-27 | 村上 鑛治 | Compaction shoe in vibratory rammer |
US5340233A (en) * | 1992-10-07 | 1994-08-23 | M-B-W Inc. | Pneumatically operated rammer |
DE4307993C2 (en) | 1993-03-13 | 1997-09-04 | Delmag Maschinenfabrik | Soil compactor |
DE4436081A1 (en) * | 1994-10-10 | 1996-04-11 | Bomag Gmbh | Vibration rammer |
US6000879A (en) * | 1997-04-15 | 1999-12-14 | Wacker-Werke Gmbh & Co. Kg | Gasoline-powered tamper |
US6134779A (en) * | 1998-11-16 | 2000-10-24 | Walker; Bruce K. | High performance forged aluminum connecting rod and method of making the same |
-
1997
- 1997-09-10 DE DE19739743A patent/DE19739743C2/en not_active Expired - Fee Related
-
1998
- 1998-08-25 EP EP98945286A patent/EP1012403B1/en not_active Revoked
- 1998-08-25 WO PCT/EP1998/005392 patent/WO1999013166A1/en active IP Right Grant
- 1998-08-25 JP JP2000510940A patent/JP3851084B2/en not_active Expired - Fee Related
- 1998-08-25 DE DE1998512129 patent/DE59812129D1/en not_active Revoked
- 1998-08-25 US US09/508,356 patent/US6848858B1/en not_active Expired - Fee Related
-
2004
- 2004-02-24 US US10/784,429 patent/US6854923B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO9913166A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2251488A2 (en) | 2009-05-14 | 2010-11-17 | Ammann Verdichtung GmbH | Tamper for soil compaction |
Also Published As
Publication number | Publication date |
---|---|
US6848858B1 (en) | 2005-02-01 |
WO1999013166A1 (en) | 1999-03-18 |
DE59812129D1 (en) | 2004-11-18 |
JP3851084B2 (en) | 2006-11-29 |
JP2001515976A (en) | 2001-09-25 |
DE19739743A1 (en) | 1999-03-18 |
US6854923B2 (en) | 2005-02-15 |
DE19739743C2 (en) | 1999-07-08 |
EP1012403B1 (en) | 2004-10-13 |
US20040165953A1 (en) | 2004-08-26 |
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