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
  • B25D17/26—Lubricating
• • 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

Definitions

• the invention relates to a drilling and / or percussion hammer, in particular a breaker with relubrication device.
• hammers especially hammers, known, which are usually held in the vertical operating position to act with a working direction substantially vertically downwards.
• the demolition hammers are used for breaking up road surfaces, concrete floors, but also as track tamping devices.
• Such a hammer usually has a drive, e.g. an internal combustion engine and a drivetrain driven by the drive.
• a Taumelwellen- or crank device To convert the rotational movement of the drive in an oscillating translational movement (reciprocating motion) of the striking mechanism between the drive and percussion a Taumelwellen- or crank device is provided.
• the crank mechanism which usually has, among other things, a connecting rod, the rotational movement of the drive motor can be converted into the reciprocating motion of a drive piston in the striking mechanism.
• a transmission may be provided for reducing the engine speed between the drive and the crank means. Such a structure has been known for a long time.
• hammers lubricate the impact mechanism and often the gearbox with loss lubrication.
• the percussion mechanism is not sealed at the transition to a tool holder, eg a chisel, holding a tool holder so that permanent lubricant can escape from the tool holder.
• This is intended to remove contaminants from the hammer mechanism and to lubricate the tool holder.
• large break hammers with which in principle almost vertically, ie down, is worked, flows in the upper part of a grease nipple in the hammer pressed lubricant with time down and exits there on the tool holder from the device, at the same time the insertion of the tool is lubricated.
• the percussion and provided between a drive and the percussion gear are housed in a crankcase space, so that the hammer mechanism is lubricated together with the transmission.
• the gearbox and the percussion mechanism are to be provided with the same lubricant in this case.
• Breaking hammers without loss lubrication so with a sealed housing, however, also require a lot of effort to achieve the necessary degree of sealing.
• regular maintenance and replacement of used lubricant and worn seals is required.
• Lubrication with oil is not possible with an open shock system with loss lubrication because it adheres worse to the percussion parts than fat.
• the invention has for its object to provide a drill and / or percussion hammer, in particular a breaker, in which sufficient lubrication of the components to be lubricated in operation is ensured, so that extended lubrication intervals can be achieved without a significant design effort, e.g. by providing an additional lubricant depot, must be provided.
• a drilling and / or percussion hammer has a drive, a driven by the drive percussion and arranged in the power flow between the drive and the percussion, coupled to an element of the impact mechanism crank means for converting a rotational movement of the drive in an oscillating translational movement of the element of the striking mechanism on.
• the element of the hammer mechanism may be a drive element, e.g. act a drive piston, which drives a percussion piston in the percussion in a known manner via an air spring.
• a collecting device for collecting lubricant is provided above the percussion mechanism.
• the operating position of the hammer and / or hammer (hereinafter also referred to as "hammer") is directed vertically, so that a main working direction is effected vertically downwards.
• hammers are so large and heavy that they can only be operated substantially vertically downwards.
• An overly oblique work or even an upward work is usually excluded and represents at best a rare exception.
• the collecting device also: lubricant collecting device
• crank device may be located in the operating position of the hammer above the percussion.
• the lubricant retained by the collector above the impactor can then be used to permanently lubricate the crank assembly.
• the collecting device may have an upwardly open collecting container for lubricant.
• the lubricant can then easily get into the collection container from above and is collected there. However, it can not or only slowly pass the collecting container to the striking mechanism.
• a transmission device In the power flow between the drive and the crank device, a transmission device can be arranged.
• the transmission device is capable of reducing the relatively high engine rotational frequency to a lower operating frequency of the striking mechanism. Also, the transmission device may then be lubricated by lubricant retained in the collector.
• the transmission device in the operating position of the hammer, can also be arranged above the striking mechanism. It can be provided with the crank device and / or the transmission device coupled conveying device for conveying the lubricant from the collecting device such that lubricant passes to the crank device and / or the transmission device.
• conveying device for conveying the lubricant from the collecting device such that lubricant passes to the crank device and / or the transmission device.
• the lubricant collecting device prevents excessive lubricant reaches the percussion. Rather, the lubricant is retained in the upper part of the hammer and collected. From the collecting device, the lubricant can then be conveyed with the aid of the conveying device to the crank device and / or to the transmission device in order to achieve the necessary lubricating effect.
• the conveying device may have a delivery element provided on the crank device and / or on the transmission device, for conveying lubricants from the collecting container of the lubricant collecting device.
• the conveying element is thus able to receive lubricant from the collecting container and to promote at least upwards, in the direction of the crank mechanism or the gear mechanism. It is not absolutely necessary that the lubricant is selectively brought to individual points of the crank mechanism or the transmission device. Rather, if the lubricant is e.g. only tossed up. The lubricant may then be e.g. also drip from the walls of a crankcase or gear housing and wet in this way at random the areas to be lubricated.
• the lubricant is basically oil or grease.
• the conveying element may be provided on an element of the crank device and / or the gear device and submerge regularly and / or permanently in the collecting container in the course of the movement which this element performs during operation. Thus, no separate movement mechanism or even a separate drive is required for the conveyor element. Rather, the conveying element can be moved along with the movement of the crank mechanism or the transmission device with and either intermittently, so for example with each revolution, or permanently in the Immerse collecting container and convey lubricant upwards or spin it.
• the conveying element may comprise a porous element (e.g., a sintered wheel), an absorbent element - e.g. a felt wheel or a
• Felt gear - or an element having a porous, porous or absorbent surface e.g., a sintered wheel or a metal wheel with
• the crank mechanism may comprise a crank element and a connecting rod.
• the crank member may e.g. be on a wheel rotatably moving crank pin, which drives the connecting rod in a conventional manner.
• the rotating drive of the crank pin via the drive motor and possibly the intermediate gear.
• the collecting device may have below the crank element and above the striking mechanism a separating bottom, the z. forms part of the collection container.
• the connecting rod may extend through a recess which is formed in the separating bottom.
• an essential part of the crank mechanism is arranged above the dividing floor and the percussion mechanism below the dividing floor. Only the connecting rod extends through the separating floor in order to transmit the driving effect to the percussion mechanism. Even if a recess is provided in the bottom, by the action of the separating base lubricant, which is initially provided in the upper part of the hammer, ie in the region of the crank mechanism and the gear mechanism, is also held in the upper part.
• the recess is designed so that only relatively little lubricant can get to the underlying percussion.
• the recess in the separating bottom can be surrounded by a raised edge, by means of which the separating base is delimited relative to the recess.
• the raised edge ensures that even more lubricant can be prevented from passing through the recess to the impact mechanism.
• the raised edge is a kind of non-contact seal for the recess penetrating the connecting rod.
• the collecting container can accordingly be formed by the separating bottom, the edge and a housing wall surrounding at least the crank mechanism. At its bottom, the sump is through the
• the separating tray may have a recess as a reservoir for lubricant, wherein the conveying element can dip in its movement into the recess. Accordingly, the conveying element can either periodically immerse itself periodically into the depression or else be immersed permanently in the depression and in this way convey lubricant out of the depression.
• the recess ensures that even a small amount of lubricant can be used to provide the components to be lubricated with sufficient lubricant.
• FIG. 1 is a schematic side view of a breaker according to a first embodiment
• FIG. 2 shows the breaker of FIG. 1 in a slightly inclined operating position
• Fig. 1 shows a first embodiment of a serving as a drill and / or percussion hammer breaker in a schematic side view.
• An engine 1 serving as a drive drives a percussion mechanism 4 via a transmission 2 and a crank mechanism 3.
• the engine 1 may be an internal combustion engine, a pneumatic motor, a hydraulic motor or an electric motor.
• the transmission 2 rotatably drives a crank disk 5 a with a crank pin 5.
• the rotational movement of the crank pin 5 is converted via a connecting rod 6 in a linear reciprocating motion, which is transmitted to a belonging to the striking mechanism 4 drive piston 7.
• the drive piston 7 is thus in a guide cylinder 8 due to the driving action of the connecting rod 6 back and forth.
• percussion piston 9 Before or below the drive piston 7 a belonging to the striking mechanism 4 percussion piston 9 is arranged. The movement of the drive piston 7 is transmitted via a formed between the drive piston 7 and the percussion piston 9 air spring 1 0 on the percussion piston 9 so that it is moved intermittently forward (down), ie in the main working direction.
• the percussion piston 9 then in turn strikes cyclically on a Einsteckende 1 1 serving as a tool chisel 12, with which the desired working effect can be achieved.
• the insertion end 1 1 is held in a tool holder 13.
• the upper part of the crank mechanism 3 and the transmission 2 are surrounded by a housing 14, from the underside of which the guide cylinder 8 extends.
• a separating tray 15 is formed, which separates the housing 14 from the guide cylinder 8.
• a recess 16 is formed, through which the connecting rod 6 extends.
• the recess 16 is dimensioned such that the connecting rod 6 is freely movable during operation in the recess 16.
• the recess 16 is surrounded by a raised edge 17.
• the edge 17 forms with the separating tray 15 and the wall of the housing 14 an upwardly open collecting container in which lubricant 18 can collect.
• the level of the lubricant 18 in the collection container is shown by a dot-dash line 18a in Fig. 1.
• the separating tray 15 has on one side a recess 19 in which the lubricant can collect. This is particularly important when only a small amount of lubricant 18 remains in the housing 14. This lubricant residue can collect in the recess 19.
• a lubricating wheel 20 is arranged, which is rotatably driven by the gear 2 and the crank pin 5 bearing crank pulley 5 a.
• the lubricating wheel 20 can be, for example, a sintered wheel or a felt wheel or a plastic or metal wheel with a felt surface or another material that can be absorbed or absorbed.
• the absorbing surface receives lubricant from the recess 19 and transfers the lubricant to the running surface of the crank gear 5a having an external toothing. This lubricant is transported upwards, so that a pinion 2a of the transmission 2 can be lubricated.
• the lubricant Due to the high peripheral speeds of the gears or the other movable elements (crank pin 5, connecting rod 6), the lubricant is distributed in the interior of the housing 14. If the lubricant reaches the inner wall of the housing 14, it flows down again into the collecting container above the separating bottom 15 and can finally be picked up and promoted again by the lubricating wheel 20 again.
• Lubricant then serves to lubricate the hammer mechanism. 4
• lubricant also reaches the insertion end 11 and subsequently into the tool holder 13. These elements are also supplied with lubricant in this way until the lubricant emerges from the tool holder 13.
• the lubricant is grease.
• oil which, owing to the design of the collecting container and in particular of the separating tray 15, is largely held in the housing 14.
• Fig. 2 shows the hammer of Fig. 1 in a respect to the vertical slightly inclined, but still substantially vertical operating position.
• the then current state of the lubricant 18 is represented by the still horizontally extending dotted line 18 a.
• the lubricating wheel 20 is sufficiently immersed in the lubricant 18, so that even in the inclined operating position sufficient lubrication is ensured.
• the main direction of work is still directed downwards.
• the hammer can easily be tilted up to 45 ° with respect to the vertical, without the risk of lack of lubrication.
• Fig. 3 shows another embodiment of the invention.
• the driven by the transmission 2 crank pulley 5a is dimensioned such that it dips with its periphery or with its external toothing in the lubricant 18 and so promotes lubricant 18 upwards.
• an additional conveying element e.g. in the form of the lubricating wheel 20 of Fig. 1, are omitted.
• the conveyor is integrated in this case in the crank mechanism 3 and in the transmission device 2.
• a scoop element 21 serving as a conveying element is provided on the crank disk 5a of the crank mechanism 3, which scoop element is inserted into the lubricant 18 with each rotation of the crank disk 5a.
• the scooping element 21 may be designed in the form of a small trowel, so that with each rotational movement lubricant is transported from the supply located on the separating tray 15 upwards or thrown into the interior of the housing 14. This also ensures adequate lubrication of the components to be lubricated.
• an element of the transmission 2 can also be used as a conveying element directly into the lubricant sump dip above the separating tray 15 and transport the lubricant upwards.
• the lubricant 18 is introduced into the housing 14 of the crank mechanism 3 above the separating bottom 15 serving as the intermediate bottom and collects on the separating tray 15. Regardless of the position of the hammer, the lubricant 18 can not flow substantially further downwards. In operation, the conveyor element dives into the
• Lubricant sump and transported or hurls the lubricant 18 upwards. There it is distributed in the upper crankcase and flows back to the housing inner wall down to
• the transmission 2 may either be housed in the upper crankcase space (housing 14) as shown in the figures. But it can also be arranged in an additional, separate room, so that only the crank mechanism 3 above vitell. Dividing floor 15 is located.
• Lubricant supply for metered lubrication is not required. Accordingly, no additional metering or conveying device with its own drive is necessary.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Percussive Tools And Related Accessories (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=41009845

Family Applications (1)

Country Status (5)

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• 2008
  • 2008-07-11 DE DE102008032791A patent/DE102008032791A1/de not_active Ceased
• 2009
  • 2009-07-07 WO PCT/EP2009/004903 patent/WO2010003634A1/de active Application Filing
  • 2009-07-07 EP EP09777006A patent/EP2300200A1/de not_active Withdrawn
  • 2009-07-07 US US13/003,729 patent/US20110192621A1/en not_active Abandoned
  • 2009-07-07 CN CN200980127129.6A patent/CN102089124B/zh not_active Expired - Fee Related

Non-Patent Citations (1)

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