GB2442324A - Hand-held machine tool with axial stop - Google Patents

Hand-held machine tool with axial stop Download PDF

Info

Publication number
GB2442324A
GB2442324A GB0718639A GB0718639A GB2442324A GB 2442324 A GB2442324 A GB 2442324A GB 0718639 A GB0718639 A GB 0718639A GB 0718639 A GB0718639 A GB 0718639A GB 2442324 A GB2442324 A GB 2442324A
Authority
GB
United Kingdom
Prior art keywords
drive shaft
drive
percussion body
hammer
stop
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.)
Withdrawn
Application number
GB0718639A
Other versions
GB0718639D0 (en
Inventor
Sim Teik Yeoh
Siew Yuen Lee
Manfred Lutz
Chin Aun Ng
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of GB0718639D0 publication Critical patent/GB0718639D0/en
Publication of GB2442324A publication Critical patent/GB2442324A/en
Withdrawn legal-status Critical Current

Links

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
    • B25D11/08—Means for driving the impulse member comprising a worm mechanism, i.e. a continuous guide surface with steadily rising and falling incline
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
    • B25B21/02—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose with means for imparting impact to screwdriver blade or nut socket

Landscapes

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

Abstract

A mechanical hammer for a hand-held machine tool, such as an impact wrench, includes a percussion body 56 driven by a drive shaft 51 on which the percussion body is axially movable and having drive cams (53, fig 1) for driving cams 54 of a driven shaft 59, and an axial stop element 70 positioned on the drive shaft 51 to limit axial movement of the percussion body 56. Preferably, the axial stop is resilient, and has an annular design. The percussion body 56 may be connected to the drive shaft 51 by at least one driving element, such as driving balls 57 arranged in a V-shaped groove 58. The axial stop prevents the balls 57 from becoming displaced from groove 58 in the event of inappropriate or unintentional handling of the tool, such as when dropped.

Description

Description Title
Mechanical Hammer State of the Art The invention relates to a mechanical hammer for a hand-held machine tool, in particular for an impact wrench, according to the precharacteriSing portion of Claim 1.
Impact wrenches with a V-groove rotary hammer are known from the state of the art, for example from DE 10 2004 032 789 Al. Rotary hammers in general convert the continuous power output of the drive motor into a percussion-type angular momentum, the energy output of the motor being stored temporarily in a mass and being passed on abruptly to the insert tool, e.g. the drill bit, by means of an impulse of high power intensity. In the case of V-groove rotary hammers especially, the rotary motion is transmitted to a weight mass (rotary-percussion weight), the rotary-percussion weight being supported in such a way that an axial motion is possible. Control of the axial motion is effected by V-shaped grooves and driving balls.
A spring is responsible for the return motion of the rotary-percussion weight.
In practice, it has been shown that as a result of an impact -for example, in the event of unintentional dropping of the impact wrench -the rotary-percussion weight may be given a sufficiently strong impulse to be displaced axially on the drive shaft, contrary to the restoring force of the spring, so far that the driving balls are released and fall out of the grooves. After this, the hammer is no longer capable of being actuated, so the electric tool has to be exchanged or repaired.
Disclosure of the Invention
The mechanical hammer according to the invention has the advantage that even in the event of a severe impact -for example, by reason of unintentional or inappropriate handling -the percussion body is not axially displaced excessively along the drive shaft. This is an advantage, in particular, when for the rotary entrainment of rotatably supported components the hammer exhibits freely mobile, i.e. loose, driving elements -for example, driving balls -which could be released as a result of a considerable axial displacement. The axial mobility of the percussion body is limited, in accordance with the invention, by virtue of the fact that the hammer is provided with an axial stop.
The mechanical hammer according to the invention serves for the percussive drive of an insert tool of a hand-held machine tool, for example an impact wrench. The hammer includes a rotatably supported drive shaft; it further includes a percussion body which is connected to the drive shaft in torsion-resistant manner and which is supported so as to be axially mobile in relation to the drive shaft.
Moreover, the hammer includes a rotatably supported driven shaft which is connected to the drive shaft in torsion-resistant manner. The percussion body exhibits drive cams which, for the percussive drive of the insert tool, are capable of being brought into active connection with driven cams of the driven shaft. The insert tool, for example the screwdriver bit, is located in a tool-receiving socket which is capable of being driven by the driven shaft.
The mechanical hammer is, in particular, a rotary hammer, quite particularly a V-groove rotary hammer. However, the invention may also be suitable for other mechanical hammers, in particular rotary hammers.
The percussion body is connected to the drive shaft in torsion-resistant manner in particular via at least one driving element. The at least one driving element is, in particular, a rolling element, preferentially a ball. The rotary entrainment may be effected in such a manner that either the percussion body is driven by an electric motor and the rotational motion of the percussion body is transmitted to the drive shaft by means of driving elements, or the drive shaft is driven by an electric motor and the rotational motion of the drive shaft is transmitted to the percussion body by means of driving elements. For example, in a V-groove rotary hammer which is known as such an electric motor drives a drive shaft which is connected to the hammer in torsion-resistant manner via driving balls. In this case the driving balls are located in V-shaped grooves in the drive shaft.
The driven shaft of the hammer according to the invention is likewise rotatably supported, the driven shaft being connected to the drive shaft in torsion-resistant manner.
This may be effected, for example, in direct manner by the drive shaft being connected to the driven shaft in torsion-resistant manner, for example via a positive closure.
However, the rotary entrainment may also be effected indirectly -as, for example, in the case of the V-groove rotary hammer -by the percussion body driven by the drive shaft transmitting the rotational motion to the driven shaft. This is done via the drive cams of the percussion body and the driven cams of the driven shaft. To this end, the restoring force of a compression spring pushes the percussion body in the direction of the driven shaft, so that the driven cams act as driving elements.
For the percussive drive of the insert tool, the percussion body is additionally supported on the drive shaft so as to be axia1ly mobile. Furthermore, a restoring element, preferentially a compression spring, for example in the form of a helical spring, is provided which keeps the percussion body prestressed. The percussion body may, depending on the manner of construction of the mechanical hammer, have been prestressed either in the direction of the driven shaft or in the direction of the drive motor.
For example, in the case of a V-groove rotary hammer which is known as such the percussion body is prestressed in the direction of the driven shaft by means of a helical spring by way of restoring element. In this case the drive-side end of the helical spring bears, for example, against the housing of the drive motor or against the end shield of a bearing for the drive shaft. The mode of operation of a mechanical hammer -in particular the manner in which, for the percussive drive of an insert tool, the drive cams are capable of being brought into active connection with the driven cams of the driven shaft by virtue of a longitudinal motion of the percussion body, so that energy is capable of being transmitted to the driven cams via the drive cams -is familiar to a person skilled in the art and will not therefore be described here in any detail.
In a preferred embodiment, the stop takes the form of a resilient element. The resilient element is preferentially formed from an elastic material, in particular from an elastomer, for example rubber or flexible foam. However, the resilient element may also be a spring -for example, a helical spring or disc spring -made of metal or plastic.
A spring element by way of stop has the advantage that the axial motion of the percussion body is not only limited but is also damped by the stop.
Furthermore, the stop is preferably of annular or discoid design. In particular, the stop is arranged around the drive shaft in annular or discoid manner. In this case the 10-annular or discoid stop is preferentially supported on the drive shaft; it may, for example, have been pushed onto the drive shaft and, where appropriate, glued thereto.
By virtue of the annular or discoid design of the stop, in particular in the form of an annular or discoid spring element, when the percussion body strikes the stop an area of the percussion body that is as large as possible comes into contact with the stop, so that the stop is able to damp the axial motion particularly well.
In an embodiment of the mechanical hammer according to the invention wherein the percussion body is prestressed in the direction of the driven shaft via a restoring element, the axial stop prevents an excessive axial displacement of the percussiOn body in the direction of the drive motor.
Accordingly, in this embodiment the stop is arranged in the region of the drive-side end of the drive shaft. In the alternative embodiment, in which the percussion body is prestressed in the direction of the drive motor, the axial stop prevents an excessive axial displacement of the percussion body in the direction of the driven shaft. For this purpose the stop is arranged in the region of the driven-side end of the drive shaft.
The hammer according to the invention is suitable for a battery-operated or mains-operated hand-held machine tool, in particular for an impact wrench.
The invention will be elucidated in more detail in the following on the basis of the appended drawings. Shown are: Figure 1 the drive train of a hand-held machine tool with a mechanical rotary hammer in an exploded representation, Figure 2 a cross-section through the mechanical rotary hammer according to Fig. 1.
The drive train of an impact wrench with a mechanical hammer 50 is shown in the exploded representation according to Fig. 1. In the following, only the essential components will be considered.
An electric motor 10 (represented schematically) includes an armature shaft 12 on which a gearwheel is arranged in torsion-resistant manner by way of driving pinion 31. The driving pinion 31 forms a part of a two-stage planetary gear set 30 and drives planet wheels 32 of the first gear stage. The planet wheels 31 roll within a ring gear 36.
By virtue of this, a first planet-carrier 33 is rotated which, in turn, drives further planet wheels 35 of the second gear stage via a gear-tooth system 34. The planet wheels 35 roll within the ring gear 36 and drive a second planet-carrier 37. The second planet-carrier 37 is connected to a drive shaft 51 of the mechanical hammer 50 in torsion-resistant manner. To this end, according to Fig. 1 the planet-carrier 37 is designed in the form of pins which are integral with the drive shaft 51. The drive shaft 51 is supported at its gear-side end in a bearing 52, preferentially in a rolling-contact bearing, in particular in a deep-groove ball bearing. The two-stage planetary gear set 30, the bearing 52 and also a part of the drive shaft 51 are received in a separate housing 20 made of plastic. At the gear-side end, the housing 20 is provided with a cap, likewise made of plastic, by way of covering element 22. The covering element 22 has a central opening 23 for receiving the armature shaft 12. At the opposite end, the bearing-side end, of the housing 20 the drive shaft 51 projects from the housing 20.
The mechanical hammer 50 according to Fig. 1 is a V-groove rotary hammer; it includes a rotatably supported drive shaft 51 with driving elements 57 in the form of driving balls in a V-shaped groove 58. Via the driving elements 57 a percussion body 56 is connected to the drive shaft 51 in torsion-resistant manner, so that the drive shaft 51 driven by the electric motor 10 via the planetary gear set 30 sets the percussion body in rotational motion. At the same time, the percussion body 56 is supported on the drive shaft 51 so as to be axially mobile. The percussion body 56 exhibits drive cams 53. Via the percussion body 56 with the drive cams 53 a rotatably supported driven shaft 59 is connected to the drive shaft 51 in torsion- resistant manner by means of driven cams 54. -In non-percussive operation the percussion body 56 is prestressed in the direction of the driven shaft 59 via a compression spring 55. The drive cams 53 engage the driven cams 54 in such a manner that the rotational motion of the percussion body 56 is transmitted to the driven shaft 59. The driven shaft 59 is likewise supported in a bearing 61. A washer 24 serves for receiving and fixing the compression spring 55, and also for protecting the housing 20 against heating and wear as a result of the friction of the compression spring 55. For the purpose of receiving an insert tool (not represented), the driven shaft 59 is connected to a tool-receiving socket 62. The hammer 50 is received in a housing part 63 which is preferentially made of metal. A housing cover 64 made of an elastic plastic covers at least some of the housing part 63.
The mode of operation of a V-groove rotary hammer will not be considered here in detail, since it is sufficiently well-known to a person skilled in the art. With reference to the mode of operation, only this much will be pointed out, namely that by virtue of a screw (not represented) bearing against a workpiece the torque requirement increases abruptly and the rotary motion of the driven shaft 59 is blocked. The percussion body 56 driven by the drive shaft 51 rotates further and is pushed in the direction of the drive-side end of the drive shaft 51 by the driving elements 57 in the V-grooves 58, contrary to the restoring force of the compression spring 55. The drive cams 53 of the percussion body 56 impinge on the driven cams 54 of the driven shaft 59, as a result of which the energy of the percussion body 56, which is stored by virtue of the rotation, is transmitted to the driven shaft 59. By virtue of this longitudinal motion, the drive cams 53 continue to slide on the driven cams 54 and glide beyond the latter.
On account of the greater clarity of layout, in Fig. 1 the mechanical hammer 50 has been represented without a stop.
In the cross-section according to Fig. 2, however, an axial stop 70 can be clearly discerned. In the embodiment according to Fig. 2 the axial stop 70 is constituted by an annular or discoid resilient element made of an elastoiner.
The diameter of the discoid resilient element made of elastomer is smaller than the diameter of the compression spring 55, so that the stop 70 is capable of being arranged within the compression spring 55. The stop 70 is supported on the drive shaft 51 in torsion-resistant manner and bears against the washer 24. As a result, the maximal axial displacement of the percussion body 56 on the drive shaft 51 contrary to the compressive force of the compression spring 55 is limited in the direction of the drive-side end of the drive shaft 51. Without an axial stop 70 the percussion body 56 could be moved still further in the direction of the drive-side end of the drive shaft 51, so that the driving elements 57 could be released and could fall out of the V-grooves 58.

Claims (9)

  1. Claims 1. Mechanical hammer for a percussive drive of an insert tool of
    a hand-held machine tool, including a rotatably supported drive shaft (51), a percussion body (56) which is connected to the drive shaft (51) in torsion-resistant manner and which is supported so as to be axially mobile in relation to the drive shaft (51), and a rotatably supported driven shaft (59) which is connected to the drive shaft (51) in torsion-resistant manner, wherein the percussion body (56) exhibits drive cams (53) and the driven shaft (59) exhibits driven cams (54), which are capable of being brought into active connection for the percussive drive of the insert tool, characterised in that an axial stop (70) is provided for the percussion body (56).
  2. 2. Hammer according to Claim 1, characterised in that the stop (70) takes the form of a resilient element.
  3. 3. Hammer according to Claim 2, characterised in that the stop (70) is formed from an elastic material, in particular from an elastomer.
  4. 4. Hammer according to one of the preceding claims, characterised in that the stop (70) is of annular design.
  5. 5. Hammer according to Claim 4, characterised in that the annular stop (70) is supported on the drive shaft (51)
  6. 6. Hammer according to one of the preceding claims, characterised in that the percussion body (56) is connected to the drive shaft (51) in torsion-resistant manner via at least one driving element (57)
  7. 7. Hammer according to Claim 6, characterised in that the at least one driving element (57) is a rolling element, in particular a ball.
  8. 8. A mechanical hammer substantially as herein described with reference to the accompanying drawings.
  9. 9. Hand-held machine tool, in particular an impact wrench, including a mechanical hammer according to one of the preceding claims.
GB0718639A 2006-09-27 2007-09-24 Hand-held machine tool with axial stop Withdrawn GB2442324A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE202006014850U DE202006014850U1 (en) 2006-09-27 2006-09-27 Mechanical beater for manual machine tool has impact body mounted axially movable and rotationally secured on drive shaft and an elastomer axial stop as ring-shaped spring element also mounted on drive shaft

Publications (2)

Publication Number Publication Date
GB0718639D0 GB0718639D0 (en) 2007-10-31
GB2442324A true GB2442324A (en) 2008-04-02

Family

ID=37514130

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0718639A Withdrawn GB2442324A (en) 2006-09-27 2007-09-24 Hand-held machine tool with axial stop

Country Status (5)

Country Link
US (1) US20080073092A1 (en)
JP (1) JP2008080485A (en)
CN (1) CN101152709A (en)
DE (1) DE202006014850U1 (en)
GB (1) GB2442324A (en)

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US7673702B2 (en) 2007-08-09 2010-03-09 Ingersoll-Rand Company Impact wrench
EP2140977B1 (en) * 2008-07-01 2012-04-25 Metabowerke GmbH Impact wrench
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DE102010029559A1 (en) * 2010-06-01 2011-12-01 Robert Bosch Gmbh Hand tool with a mechanical percussion
DE102010031499A1 (en) 2010-07-19 2012-01-19 Robert Bosch Gmbh Hand tool with a mechanical percussion
DE102010038210A1 (en) 2010-10-15 2012-04-19 Wera-Werk Hermann Werner Gmbh & Co. Kg Torque transmission device for use with a rotary impact driver
DE102010063200A1 (en) * 2010-10-28 2012-05-03 Robert Bosch Gmbh Hand tool with a mechanical percussion
DE102010043099A1 (en) 2010-10-29 2012-05-03 Robert Bosch Gmbh Hand tool with a mechanical percussion
DE102010043737A1 (en) 2010-11-11 2012-05-16 Robert Bosch Gmbh Hand-held power tool i.e. battery-powered torque impact wrench, has insertion tool provided with inner multi-edge clutch that is displaceable on outer holder, and tool holder fastened to driven shaft via force-fit connection
DE102010063080A1 (en) 2010-12-14 2012-06-14 Robert Bosch Gmbh Hand tool with a mechanical percussion
DE102011000710A1 (en) 2011-02-14 2012-08-16 Wera-Werk Hermann Werner Gmbh & Co. Kg Torque transmission device in the form of a bit lining
DE102011085420A1 (en) 2011-10-28 2013-05-02 Robert Bosch Gmbh Hand-held power tool i.e. rechargeable battery rotary impact screwdriver, has ejection element blocking lock sleeve by actuation of one locking element in operating direction in assigned unlocking position
DE102011089910A1 (en) 2011-12-27 2013-06-27 Robert Bosch Gmbh Hand tool device
DE102012202371A1 (en) 2012-02-16 2013-08-22 Robert Bosch Gmbh Hand-held power tool e.g. rechargeable battery rotary percussion screwdriver has magnetization component that is arranged in region of tool holder so as to provide magnetic force for magnetization of insertion tool and/or tool holder
DE102013208433A1 (en) 2012-05-25 2013-11-28 Robert Bosch Gmbh Power tool
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DE102012211183A1 (en) 2012-06-28 2014-01-02 Robert Bosch Gmbh Power tool
DE102012211907A1 (en) 2012-07-09 2014-01-09 Robert Bosch Gmbh Rotary impact wrench with a striking mechanism
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DE102012217917A1 (en) 2012-10-01 2014-04-03 Robert Bosch Gmbh Hand-held power tool e.g. impact screwdriver, has drive motor comprising motor magnet mass that exhibits weight of specific range, and rechargeable battery cells arranged in handgrip of machine housing
DE102012217913A1 (en) 2012-10-01 2014-04-03 Robert Bosch Gmbh Portable power tool e.g. drywall screwdriver with electronically commutated drive motor has associated machine volume that is set less than one liter, while operating voltage greater than and less than specific volt is supplied
DE102012217906A1 (en) 2012-10-01 2014-04-03 Robert Bosch Gmbh Hand tool with a designed to provide a predetermined maximum engine power drive motor
TWI498196B (en) * 2012-10-05 2015-09-01 China Pneumatic Corp A method of indirectly coupled torque control and the mechanism thereof
DE102013213816A1 (en) 2012-11-15 2014-05-15 Robert Bosch Gmbh Tool attachment for a hand tool
DE102013213806A1 (en) 2012-11-15 2014-05-15 Robert Bosch Gmbh Tool attachment for a hand tool
DE102014207713A1 (en) 2014-04-24 2015-10-29 Robert Bosch Gmbh Tool attachment for a hand tool
DE102013213814A1 (en) 2012-11-15 2014-05-15 Robert Bosch Gmbh Tool attachment for a hand tool
DE102012220905A1 (en) 2012-11-15 2014-05-15 Robert Bosch Gmbh Handheld machine tool i.e. battery-operated rotary percussion screwdriver, has interface designed such that centering and tangential and radial fixing of attachment to housing are ensured by cooperation of interface with locking elements
DE102013213804A1 (en) 2012-11-22 2014-05-22 Robert Bosch Gmbh Tool attachment for a hand tool
DE102013205913A1 (en) 2013-04-04 2014-10-09 Robert Bosch Gmbh Electronically commutated drive motor and power tool
DE102013208890B4 (en) 2013-05-14 2023-12-14 Robert Bosch Gmbh Hand tool device
DE102013209173A1 (en) 2013-05-17 2014-11-20 Robert Bosch Gmbh Hand tool with a spindle locking device
DE102013218675A1 (en) 2013-09-18 2015-03-19 Robert Bosch Gmbh Hand tool
DE102014224366A1 (en) 2014-11-28 2016-06-02 Schaeffler Technologies AG & Co. KG Actuator assembly and method of actuating an actuator
DE102015204807A1 (en) 2015-03-17 2016-09-22 Robert Bosch Gmbh Hand tool and mechanical percussion
DE102015214417A1 (en) 2015-07-29 2017-02-02 Schaeffler Technologies AG & Co. KG Hydrostataktor
DE102016200979A1 (en) 2016-01-25 2017-07-27 Robert Bosch Gmbh Hand tool with a tool holder
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Also Published As

Publication number Publication date
CN101152709A (en) 2008-04-02
JP2008080485A (en) 2008-04-10
DE202006014850U1 (en) 2006-11-23
GB0718639D0 (en) 2007-10-31
US20080073092A1 (en) 2008-03-27

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