Hand tool device

Abstract

A hand tool device with a striking mechanism (22) comprising a striker (58), at least one cam guide (72) which drives the striker (58) at least during impact drilling operation, and at least one striking mechanism spring (62) which stores at least part of an impact energy in at least one operating state, characterized in that the striking mechanism spring (62) secures the striker (58) circumferentially in at least one operating state, such that the striking mechanism spring (62) exerts a force on the striker (58) which counteracts a circumferential force acting on the striker (58), which is caused in particular by the cam guide (72), and thus the securing of the striker (58) by the striking mechanism spring (62) prevents a movement of the striker (58) about an axis of rotation of the striking mechanism spindle by more than 360 degrees, advantageously a movement by more than 180 degrees, and particularly advantageously a movement by more than 90 degrees.

Description

State of the art

[0001] A hand tool device with a percussion mechanism, comprising a beater, at least a cam guide which drives the beater at least during percussion drilling operation, and at least one percussion spring which stores at least part of the impact energy in at least one operating state, has already been proposed. Disclosure of the invention

[0002] The invention relates to a hand tool device with a striking mechanism comprising a beater, at least a cam guide which drives the beater at least during impact drilling operation, and at least one striking mechanism spring which stores at least part of an impact energy in at least one operating state.

[0003] It is proposed that the impact mechanism spring secures the striker circumferentially in at least one operating state. The term "impact mechanism" is understood to mean, in particular, a device designed to generate an impact impulse and, in particular, to transmit it in the direction of a tool. Preferably, the impact mechanism transmits the impact impulse, at least during impact drilling operation, advantageously via a tool spindle and / or, in particular, via a tool attachment of the hand tool device to the tool. Preferably, the impact mechanism is designed to convert a rotational movement into a, in particular, a translational impact movement. In particular, the impact mechanism is not designed as a ratchet mechanism. "Designed" is understood to mean, in particular, specifically programmed, designed, and / or equipped.In particular, the term "beater" shall be understood to mean a means which, at least during impact drilling, is accelerated, at least substantially, translationally and releases an impulse absorbed during acceleration as an impact impulse in the direction of the tool being used. Preferably, the beater is formed in one piece. Alternatively, the beater could be formed in multiple pieces. In particular, a "curve guide" shall be understood to mean a device which converts rotational energy for generating an impact into linear kinetic energy of the beater, at least by means of a specially shaped guide surface along which, at least during impact drilling, a connecting element runs. Preferably, the impact mechanism includes an impact spring that stores the linear kinetic energy of the beater for generating the impact. Preferably, the specially shaped surface is a surface that defines a guide curve of the curve guide.Preferably, the cam is designed to move the striker to deliver one strike per revolution of the impact mechanism spindle of the hand tool device. Alternatively, the cam could be designed to move the striker to deliver at least two, or advantageously three, strikes per revolution of the impact mechanism spindle. In this case, a striking mechanism gearbox could be omitted. Preferably, the cam exerts a force on the striker that is directed away from the tool attachment. A "connecting element" is understood to mean, in particular, a means that establishes a mechanical connection between at least one rotating part of the impact mechanism, in particular an impact mechanism spindle, which moves during impact drilling operation, and the striker, which moves, in particular, linearly. Preferably, the connecting element is spherical.Alternatively, the connecting element could have a different shape that would be considered advantageous by a person skilled in the art. Preferably, the connecting element has a diameter greater than 4 mm, advantageously greater than 5 mm, and particularly advantageously greater than 6 mm. More preferably, the connecting element has a diameter less than 14 mm, advantageously less than 10 mm, and particularly advantageously less than 8 mm. In particular, a "guide curve" is understood to be an area bounded by the guide surface in which the connecting element runs in at least one operating state. Preferably, the impact mechanism has exactly one guide curve with exactly one guide curve and at least one connecting element. Alternatively, the impact mechanism could have two, or in particular more than two, guide curves, each with exactly one guide curve and at least one connecting element.The term "percussion drilling operation" refers specifically to the operation of the hand tool device in which the working tool is driven by a rotational and impact action during workpiece machining. The term "impact spring" refers specifically to a spring that, in at least one operating state, exerts a force on the striker in the direction of impact. "Impact energy" refers specifically to the energy that accelerates the striker in the direction of impact before a strike. In this context, "storage" refers specifically to the fact that the impact spring absorbs the impact energy at one point in time and releases it to the striker at a later time, particularly by accelerating the striker. Preferably, the cam track tensions the impact spring.In particular, the phrase "circumferentially fixed" is to be understood as meaning that, in at least one operating state, the striking mechanism spring exerts a force on the striker that counteracts a circumferentially acting force on the striker, which is particularly responsible for the curved movement. Preferably, the fixing of the striker by the striking mechanism spring prevents movement of the striker around an axis of rotation of the striking mechanism spindle by more than 360 degrees, advantageously by more than 180 degrees, and particularly advantageously by more than 90 degrees. A "circumferentially acting force" is to be understood in particular as a force that has at least one component oriented perpendicular to an axis of rotation of a striking mechanism spindle of the striking mechanism and that produces a torque relative to the circumferential direction of the striking mechanism spindle.The inventive design of the hand tool device allows for a particularly cost-effective, lightweight, and space-saving construction. In particular, a separate attachment of the bat is no longer necessary.

[0004] In a further embodiment, it is proposed that the impact spring secures the striker in the circumferential direction during clockwise rotation, thus advantageously achieving clockwise impact operation. "Counterclockwise rotation" is understood to mean, in particular, an operating condition in which the tool mounting is driven clockwise when viewed in the direction of impact. Preferably, the impact spindle of the hand tool rotates in the same direction as the tool mounting, at least during impact drilling. Alternatively, the impact spindle could rotate in a different direction than the tool mounting during impact drilling. A person skilled in the art would adapt the attachment of the striker by means of the impact spring to the direction of rotation of the impact spindle.A "counterclockwise rotation" is understood to mean, in particular, an operating condition in which the tool holder is driven counterclockwise when viewed in the direction of impact. A "direction of impact" is understood to mean, in particular, a direction that runs parallel to an axis of rotation of the tool holder and that is directed from the striker towards the tool holder.

[0005] Furthermore, it is proposed that the bat incorporates a catching mechanism upon which the striking spring acts circumferentially during a clockwise rotation, thus enabling a particularly simple design. A "catching mechanism" is understood to mean, in particular, a means designed to capture the bat from an initial rotational movement during a clockwise rotation and to establish a rotationally fixed connection.

[0006] Furthermore, it is proposed that the catch and the striking spring engage in a positive fit during clockwise rotation in the circumferential direction, thereby ensuring reliable attachment of the bat during striking. A "positive fit" is understood to mean, in particular, a geometric engagement of the catch with the striking spring that counteracts any rotational movement of the bat.

[0007] Furthermore, it is proposed that the striker, in counterclockwise rotation, has at least a substantial freewheel, particularly with respect to the tool housing of the tool attachment and advantageously with respect to the impact spring. Specifically, "substantially freewheel" in this context means that, in counterclockwise rotation, a rotation of the impact spindle causes a rotation of the striker, thereby advantageously preventing the striker from striking the tool. "Substantially" in this context means, in particular, that in impact drilling operation, the striker, when the tool attachment is in counterclockwise rotation, delivers an impact energy that is less than 50%, and advantageously less than 25%, of the impact energy that the striker delivers at the same rotational speed in clockwise rotation.The freewheel mechanism in reverse rotation eliminates the need for a separate impact mechanism shut-off in reverse. This allows for a particularly cost-effective, lightweight, and space-saving design.

[0008] It is further proposed that the racket incorporates at least a portion of the curved track, thereby enabling a particularly small overall size. The phrase "the racket incorporates at least a portion of the curved track" is understood to mean, in particular, that the racket has a surface onto which the connecting element directly transfers the energy to generate the striking motion. Preferably, the portion of the curved track incorporated by the racket is designed as a surface that fixes the connecting element in place relative to the racket. Advantageously, the portion of the curved track incorporated by the racket includes a fastening recess bounded by the surface, which fixes the connecting element in place relative to the racket.Advantageously, the bat is designed to attach the connecting element, which, during operation, connects part of the curve guide and another part of the curve guide, in particular the guide curve. Preferably, the connecting element and the bat are connected without springs. This means, in particular, that there is no spring effect between the connecting element and the bat. Alternatively, the connecting element could be formed at least partially integrally with the bat. Furthermore, the part of the curve guide that the bat has could alternatively be designed as a guide curve. "Fixed position" is understood to mean, in particular, that an axis of symmetry and / or a center point of the connecting element is at least substantially stationary relative to the bat during operation.

[0009] In an advantageous embodiment of the invention, it is proposed that the hand tool device has a tool spindle with at least one bearing surface which, in at least one operating state, supports the striker so that it can be moved, particularly in the axial direction, thereby achieving a particularly low-friction and low-wear bearing of the striker. A "tool spindle" is understood to be, in particular, a shaft that transmits a rotational movement from the gearbox to the tool mounting. Preferably, the bearing surface exerts a radially directed bearing force on the striker. Preferably, during impact drilling, the striker is moved essentially translationally in the impact direction, while the tool spindle is driven in a rotary direction during impact drilling. Preferably, the tool spindle is designed as a solid shaft. Alternatively, the tool spindle could be designed as a hollow shaft.In particular, a "bearing surface" shall be understood to be a surface which, during operation, exerts a bearing force perpendicular to the surface on the bat and enables movement of the bat parallel to the surface.

[0010] In a further embodiment, it is proposed that the impact mechanism has an impact spindle with a bearing surface that movably supports the impactor in at least one operating state, thus enabling a particularly compact design. An "impact spindle" is understood to be, in particular, a shaft that transmits a rotary motion directly to at least one section of the cam guide, at least during impact drilling operation. Preferably, the impact spindle is rotationally fixed to at least one section of the cam guide, in particular to a fastening element of the cam guide, which guides the connecting element of the cam guide, especially on a circular path. Advantageously, the impact spindle transmits the rotational motion from a rotational motion driving the tool holder to the cam guide separately. In particular, the impact spindle is designed separately from the tool spindle.Preferably, the impact mechanism spindle is designed as a hollow shaft.

[0011] Furthermore, it is proposed that the tool spindle have at least one striking surface against which the striker impacts, at least during impact drilling operation, thus achieving a particularly simple design. A "striking surface" is understood to be, in particular, a surface of the tool spindle through which the striker transmits the impact impulse to the tool spindle in at least one operating state. Preferably, the striker impacts the tool spindle directly. Alternatively, the striker could impact the tool spindle via a hammer.

[0012] The hand tool device according to the invention is not intended to be limited to the application and embodiment described above. In particular, the hand tool device according to the invention may, in order to fulfill a function described herein, have a different number of individual elements, components and units than the number mentioned herein. drawing

[0013] Further advantages will become apparent from the following description of the drawing. The drawing illustrates an embodiment of the invention. The drawing, the description, and the claims contain numerous features in combination. A person skilled in the art will expediently consider the features individually and combine them into meaningful further combinations.

[0014] They show:

[0015] Fig. 1 a cut of a hand tool with a hand tool device according to the invention,

[0016] Fig. 2 a partially isolated section through a percussion mechanism and a planetary gear of the hand tool device Fig. 1,

[0017] Fig. 3 a first side view of a beater of the striking mechanism of the hand tool device Fig. 1,

[0018] Fig. 4 a second side view of the racket Fig. 3 from an opposite side,

[0019] Fig. 5 a first cutting surface A of the impact mechanism of the hand tool device made of Fig. 1,

[0020] Fig. 6 the racket out Fig. 3 viewed in the direction of the blow,

[0021] Fig. 7 the racket out Fig. 3 in a perspective view,

[0022] Fig. 8 the racket out Fig. 3 viewed in the direction of the blow,

[0023] Fig. 9 a cross-sectional area B through a first planetary gear stage of the hand tool device Fig. 1,

[0024] Fig. 10 a partially isolated side view of a part of the hand tool device made of Fig. 1,

[0025] Fig. 11 a cutting surface C through a control element of an impact shut-off device of the hand tool device Fig. 1,

[0026] Fig. 12 a cutting surface D through a spindle locking device of the hand tool device made of Fig. 1,

[0027] Fig. 13 a cutting surface E through a limiting guide means of the spindle locking device of the hand tool device from Fig. 1,

[0028] Fig. 14 a cutting surface F through a second planetary gear stage of the hand tool device Fig. 1,

[0029] Fig. 15 a cross-sectional area G through a planet carrier of a third planetary gear stage of the hand tool device Fig. 1,

[0030] Fig. 16 a cross-sectional area H through planet gears of the third planetary gear stage of the hand tool device Fig. 15,

[0031] Fig. 17 a cross-sectional area I through a planet carrier of a fourth planetary gear stage of the hand tool device Fig. 1 and

[0032] Fig. 18 a cross-sectional area J through planet gears of the fourth planetary gear stage of the hand tool device Fig. 17. Description of the exemplary embodiment

[0033] Fig. 1 shows a hand tool 10 The hand tool 10 It is designed as an impact drill / driver. The hand tool 10 a hand tool device according to the invention 12 , a hand tool case 14 and a battery interface 16 open. The battery interface 16 is intended to be used for the hand tool device 12to supply electrical energy from a hand tool battery (not shown in detail here). The hand tool housing 14 It is essentially pistol-shaped. It includes a handle. 18 , by means of which an operator can use the hand tool 10 during a work process. The hand tool device 12 includes a tool guidance unit 20 , a percussion instrument 22 , a shock shut-off device 24 , a gearbox 26 , a percussion mechanism 28 , a drive unit 30 , an operating device 32 , a torque limiting unit 34 and a spindle locking device 36 The drive unit 30 is designed as an electric motor. The gearbox 26 is intended to determine the rotational speed of the drive unit 30 to reduce. In addition, the gearbox 26It is intended to provide at least two different translations.

[0034] A gripping surface of the handle 18 is essentially perpendicular to a rotational axis of the tool guidance unit 20 trained. The hand tool case 14 points to one of the tool guidance units 20 opposite side in relation to the handle 18 an overhang. A basic form of the hand tool housing. 14 It is therefore T-shaped.

[0035] The tool guidance unit 20 includes a tool attachment 38 and a tool spindle 40 The tool attachment 38 and the tool spindle 40 are screwed together. Alternatively, the tool attachment could be used. 38 and the tool spindle 40It must be connected in a way that appears sensible to an expert and can be detached without tools. The tool attachment 38 The tool attachment secures a tool (not shown here), such as a drill bit or screwdriver bit, during a work process. 38 The tool holder secures the insert tool by friction. Alternatively or additionally, a tool holder could secure the insert tool by positive locking, for example with an SDS chuck or a hexagonal holder. The tool holder 38 It features three clamping jaws, movable by the operator, which secure the tool during a work operation. The tool holder also secures the tool. 38 The tooling tool is axially immovable relative to the tooling tool mounting during a work operation. 38 and especially in relation to the tool spindle 40 . Part of the tool attachment38 and the tool spindle 40 are connected to each other in a way that is relatively immovable. Here are the tool attachments. 38 and the tool spindle 40 screwed together.

[0036] The hand tool device 12 a storage medium 42 up, that the tool spindle 40 on one of the tool attachments 38 stored on the side facing the storage device. 42 the tool spindle is mounted 40 axially displaceable. The bearing means 42 is axially fixed to the tool spindle 40 connected. The storage device 42 is axially movable in the hand tool housing 14 stored. The hand tool device 12 another storage medium 44 up, that the tool spindle 40 on one of the gearbox 26 stored on the side facing the storage device. 44is designed as a plain bearing. The bearing element 44 the tool spindle is mounted 40 axially displaceable. The tool spindle 40 includes a striking surface 46 , on which, in a depicted impact drilling operation, the impact mechanism 22 hits.

[0037] The hand tool case 14 The hand tool housing is made up of several parts. 14 includes a two-shell handle and drive housing 48 , a double-walled outer casing 50 , a gearbox housing 52 , a percussion gear housing 54 and a percussion mechanism housing 56 These parts of the hand tool housing 14 are manufactured separately. The handle and drive housing 48 forms the handle 18 and encloses the drive unit 30 The outer casing 50 surrounds the gearbox housing 52 and the impact mechanism housing54 . In addition, the outer casing secures 50 the gearbox housing 52 , the impact mechanism gearbox housing 54 and the percussion mechanism housing 56 positively locking to the handle and drive housing 48 The gearbox housing 52 surrounds the gearbox 26 It is tubular in shape. The striking mechanism gearbox housing. 54 encloses the impact mechanism 28 The striking mechanism housing 56 surrounds the percussion 22 It is also tubular in shape.

[0038] In the Fig. 2 are the percussion instruments 22 and the gearbox 26 , the percussion mechanism 28 , the torque limiting unit 34 and the spindle locking device 36 A more detailed explanation of the percussion section. 22 It can be switched between an activated and a deactivated operating state. The percussion mechanism 22 shows a racket 58, a percussion spindle 60 , a striking mechanism spring 62 and a racket drive device 64 up. The striking mechanism spindle 60 surrounds the storage device 44 , that the tool spindle 40 on one of the gearbox 26 stored on the side facing the storage device. 44 is effectively between the tool spindle 40 and the percussion spindle 60 arranged. The racket 58 is in one direction of impact 66 Mounted so that it can move translationally. The direction of impact 66 is parallel to an axial direction of the impact spindle 60 aligned.

[0039] The tool spindle 40 and the percussion spindle 60 Each has a storage area 68 , 70 on, on which the racket 58 It is mounted in a movable manner. The storage areas 68 , 70 act directly on the racket 58The storage areas 68 , 70 are the cylindrical surfaces of the tool spindle 40 or the striking mechanism spindle 60 Alternatively, the racket could 58 only on the tool spindle 40 or on the percussion spindle 60 and possibly on the outside of the racket 58 be stored. An inside of the racket 58 limits an interior space that extends in the direction of impact 66 narrows inwards. The storage area 68 the tool spindle 40 It acts on a narrowed area on the inside of the racket 58 The storage area 70 the percussion spindle 60 acts on one of the gearboxes 26 facing, unconstricted area on the inside of the racket 58 The racket 58 It has a pot-shaped base, with a recess arranged in the bottom of the pot-shaped base through which the tool spindle passes. 40The racket runs 58 In a machine with a bottom surface of the pot-shaped base, it strikes the tool spindle. 40 The racket 58 surrounds the tool spindle 40 and the percussion spindle 60 on at least one plane perpendicular to the direction of impact 66 It is aligned to rotate 360 ​​degrees.

[0040] Alternatively, a striking mechanism could consist of a beater and a striking mechanism spindle, with the striking mechanism spindle enclosing the beater. In this case, a cam guide for the striking mechanism would be located on the outside of the beater. Either the beater or the striking mechanism spindle could have a guide curve for the cam guide. A larger radius for the cam guide would be advantageous in this case if it were designed to move the beater into multiple strikes per revolution.

[0041] Fig. 3 and Fig. Figure 4 shows the striking mechanism spindle. 60 in two side views that differ by 180 degrees. Fig. Figure 5 shows a cross-sectional area A of the racket drive device 64 The racket drive device 64 has exactly one curve guidance 72 up. The curve 72 includes a guidance curve 76 , a connecting agent 78 and a fastening device 80 The curve 72 is on the percussion spindle 60 arranged. Alternatively, at least one curve could be arranged on a racket. The fastening device 80 is on the racket 58 arranged. The racket 58 This thus indicates part of the curve guidance 72 Alternatively, at least one fastening device could be arranged on a percussion spindle.

[0042] The fastening device 80is a fastening recess for the fastener 78 trained. The fastening device 80 is on the inside of the racket 58 arranged. The fastening device 80 is achieved by means of a hole drilled through a side of the bat facing away from the fastening device 58 inside the racket 58 introduced. The connecting agent 78 is shaped like a sphere. The connecting element 78 It has a diameter of 7 mm. The fastener 80 stores the connecting agent 78 relative to the racket 58 stationary. The connecting element 78 slides in the guide curve during impact drilling operation 76 The striking mechanism spindle 60 limits a space in which the connecting element is located 78 during the impact drilling operation.

[0043] The percussion spindle 60It is designed as a hollow shaft. The impact mechanism spindle 60 is on one of the tool attachments 38 opposite side in the hand tool housing 14 rotatably mounted. The impact mechanism gearbox 28 drives the percussion spindle 60 The striking mechanism spindle indicates this. 60 on one of the tool attachments 38 a toothed joint on the opposite side 82 up. The lead curve 76 features a free-running area 84 , a striking elevator area 86 and a mounting recess 88 on. During assembly, the fastener 78 through the mounting recess 88 into the fastener 80 of the racket 58 introduced. The striking mechanism spindle 60 rotates in the direction of impact during impact drilling operation 66 Viewed clockwise. The striking mechanism area 86It has a spiral shape. It extends approximately 180 degrees around an axis of rotation. 90 the percussion spindle 60 The impact elevator area 86 moves the connecting element 78 and thus the racket 58 during impact drilling against the direction of impact 66 .

[0044] The impact-free running area 84 connects two ends 92 , 94 of the impact elevator area 86 The impact-free area 84 extends approximately 180 degrees around the axis of rotation 90 the percussion spindle 60 The impact-free area 84 has a striking flank 96 up, which from the gearbox 26 facing end 92 of the impact elevator area 86 starting, roughly parallel to the direction of impact 66 runs. After the connecting agent 78 into the freewheeling area 84Once it has penetrated, the striking mechanism spring accelerates 62 the racket 58 and the connecting agent 78 in the direction of impact 66 The connecting element moves during this process. 78 through the impact freewheel area 84 , without experiencing an axial force, until the racket 58 on the striking surface 46 hits. Thus, the striking mechanism spring stores 62 in at least one operating state at least part of an impact energy that the bat 58 in the event of an impact on the tool spindle 40 transfers.

[0045] Fig. 6 and Fig. 7 show the racket 58 The striking mechanism spring 62 accelerates the racket 58 before a strike in the direction of the strike 66 The hand tool housing provides additional support. 14 the striking mechanism spring 62 on one of the racket 58 opposite side. The striking mechanism spring 62presses directly against the racket 58 A substantially ring-shaped or helical surface 100 a ring-shaped formation 98 to the basic shape of the racket 58 supports the striking mechanism spring 62 off. The striking mechanism spring 62 surrounds part of the racket 58 The striking mechanism spring 62 attaches the racket 58 during the impact drilling operation in the circumferential direction.

[0046] The racket 58 a fishing device 102 up, so that the striking mechanism spring 62 in a clockwise rotation of the tool attachment 38 This effect occurs during peripheral drilling operation. When the tool attachment rotates clockwise... 38 The striking mechanism spindle rotates 60 in this embodiment in the direction of impact 66 also viewed clockwise. It is obvious to the expert that the trapping device 102on a percussion spindle rotating counterclockwise (against the clockwise rotation) 60 to adapt.

[0047] The fishing device 102 has a rest area 104 on, which are at least essentially perpendicular to the surface 100 the shaping 98 is aligned with the striking mechanism spring 62 to accelerate the racket 58 presses. The surface 100 , upon which the striking mechanism spring 62 to accelerate the racket 58 It presses, is ramp-shaped and relative to the direction of impact 66 inclined. During the clockwise rotation of the tool attachment 38 The striking mechanism spring acts 62 to the rest area 104 and connects the racket 58 and the striking mechanism spring 62 Form-fit in the circumferential direction. During the counterclockwise rotation of the insert tool fastening 38 The striking mechanism spring is slipping 62 over the rest area104 Thus, the racket 58 and the striking mechanism spring 62 during the counterclockwise rotation of the tool attachment 38 a freewheel relative to each other in the circumferential direction. Alternatively, the striking mechanism spring could 62 always non-rotating with the racket 58 be connected and the striking spring 62 could create a freewheel relative to the hand tool housing during left-hand rotation 14 exhibit.

[0048] How Fig. Figure 8 shows a rotationally fixed feature with the hand tool housing. 14 connected component of the hand tool 10 , this is an example of a hollow gear 122 exhibits a substantially ring-shaped or helical surface 106 on, which the striking mechanism spring 62 in the opposite direction of impact 66 The aligned direction is supported. The surface 106 is through a resting area 107interrupted, essentially perpendicular to the surface 106 the component is aligned. The resting surface 107 is intended to be used in the clockwise rotation of the tool attachment 38 on the striking spring 62 to exert a force in the circumferential direction that causes a movement of the racket 58 counteracts this. Thus, the rest area connects 107 the hand tool case 14 and the striking mechanism spring 62 in circumferential direction during the clockwise rotation of the tool attachment 38 positive locking. Alternatively, the striking mechanism spring could be used. 62 on one of the racket 58 opposite side rotationally fixed to the hand tool housing 14 be connected, for example, by one end of the striking mechanism spring 62 forming wire in the direction of the drive unit 30 is bent and protrudes. Furthermore, as an alternative to the described component, the ring gear could be used. 122another component that appears useful to the expert: the resting surface 107 exhibit, for example, a housing part of the hand tool housing 14 .

[0049] The racket 58 has a ventilation opening 108 up, through the air during a movement of the racket 58 from one of the tool spindles 40 , the percussion spindle 60 and the racket 58 can escape from the limited space and / or flow into the space.

[0050] The impact mechanism 28 is between the gearbox 26 and the percussion 22 arranged. The impact mechanism 28 features a first planetary gear stage 110 up. The gearbox 26 features a second planetary gear stage 112 , a third planetary gear stage 114 and a fourth planetary gear stage 116 on.

[0051] Fig. Figure 9 shows a cross-sectional area B of the first planetary gear stage 110 The first planetary gear stage 110 increases the first rotational speed of the second planetary gear stage 112 to drive the percussion mechanism 22 The second planetary gear stage 114 This initial rotational speed drives the tool spindle. 40 on. The interlocking 82 the percussion spindle 60 forms a sun gear of the first planetary gear stage 110 The interlocking 82 combs with planetary gears 118 the first planetary gear stage 110 , which are from a planetary carrier 120 the first planetary gear stage 110 be guided. The ring gear 122 the first planetary gear stage 110 combs with the planetary gears 118 the first planetary gear stage 110 The ring gear 122 is rotationally fixed to the hand tool housing 14tied together.

[0052] The impact cut-off device 24 is intended to be used for the percussion 22 The impact cut-off device is designed to switch off during screwdriving, drilling, and in impact drilling mode when the tool is unloaded. 24 has three transmission means 128 , a control element 130 and an impact cut-off clutch 132 on.

[0053] Fig. Figure 10 shows a side view of the impact shut-off device. 24 . Fig. Figure 11 shows a cross-sectional area C through the control element 130 the impact cut-off device 24 Furthermore, the Fig. 11 a connecting element 124 , that the tool spindle 40 and a planetary carrier 126 the second planetary gear stage 112 It connects in a rotationally fixed manner. The connecting element 124 connects the tool spindle 40and the planetary carrier 126 the second planetary gear stage 112 axially displaceable. The impact cut-off clutch 132 is between the first planetary gear stage 110 and the second planetary gear stage 112 arranged. The impact cut-off clutch 132 has a first coupling element 134 up, which includes part of the percussion mechanism 22 is always rotary-coupled. The first coupling element 134 is rotationally fixed to the planet carrier 120 the first planetary gear stage 110 connected. The first coupling element 134 is one piece with the planet carrier 120 the first planetary gear stage 110 trained. The impact cut-off clutch 132 features a second coupling element 136 up, which always involves a part of the transmission 26 is rotary-coupled. The second coupling element 136 is rotationally fixed with the connecting element 124connected. The second coupling element 136 is one piece with the connecting element 124 trained. The planetary carrier 126 the second planetary gear stage 112 is rotationally fixed to the second coupling element 136 connected. In the depicted impact drilling operation, the impact cut-off clutch is engaged. 132 Closed. During impact drilling, the tool spindle transmits 40 an axial coupling force on the impact cut-off clutch 132 When the operator presses the tool against a workpiece, the clutch force closes the impact-stop clutch. 132 When the operator lifts the tool from the workpiece, a trigger spring opens. 140 the impact cut-off device 24 the impact cut-off clutch 132 .

[0054] The means of transmission 128 are designed as rods. The control element 130supports the tool guidance unit 20 in a screwing and drilling mode in one direction opposite to the direction of impact 66 off. One on the tool guidance unit 20 The applied force acts via the bearing means 44 , another means of transmission 142 the impact cut-off device 24 and the transmission means designed as rods 128 on support surfaces 144 of the control element 130 This prevents the coupling elements from 134 , 136 in the screwing and drilling mode. The further transmission means 142 It is essentially star-shaped with an annular, disc-shaped central area. The control element 130 has three recesses 146 on. In the depicted impact drilling operation, the transmission means 128 into the recesses 146 inserted, thereby the tool guidance unit 20is axially movable in impact drilling mode.

[0055] The connecting element 128 is effective between the planetary carrier 126 the second planetary gear stage 112 and the tool spindle 40 arranged. In addition, the connecting element 128 the second coupling element 136 the impact cut-off clutch 132 on. The connecting element 128 is against the impact spring 140 axially displaceable mounting. By means of an axial displacement of the connecting element. 128 in the direction of the tool attachment 38 The impact cut-off clutch will 132 opened. The connecting element 128 It is always rotationally fixed and axially displaceable with the tool spindle. 40 connected. This keeps the planetary carrier. 126 the second planetary gear stage 112 even when struck with the tool spindle 40rotatably coupled. The planet carrier 126 the second planetary gear stage 112 is rotationally fixed with the connecting element 128 connected. The planetary carrier 126 the second planetary gear stage 112 and the connecting agent 128 are connected in a way that allows axial displacement relative to each other.

[0056] Fig. Figure 12 shows a cross-sectional surface D of the spindle locking device 36 The spindle locking device 36 is intended to protect the tool spindle 40 rotationally fixed with the hand tool housing 14 to connect when a tool torque is applied to the tool holder 38 is applied, for example, when clamping a tool into the tool holder. 38 The spindle locking device 36 is partially integral with the connecting element 128 and the planetary carrier 126 the second planetary gear stage112 trained. The spindle locking device 36 exhibits blocking agents 150 , first clamping surfaces 152 , a second clamping surface 154 and free-running areas 156 up. The blocking agents 150 are cylindrical in shape. The first clamping surfaces 152 are defined as areas of a surface of the fastener 128 trained. The first clamping surfaces 152 are formed just like this. The second clamping surface 154 is considered an inner side of a clamping device 158 the spindle locking device 36 trained.

[0057] The clamping device 158 is designed as a clamping ring. The clamping element 158 is via a component of the spindle locking device 36 rotationally fixed with the hand tool housing 14 connected, namely to the striking mechanism housing 56 of the hand tool housing 14 Here is the clamping device. 158via a lifting device 160 the spindle locking device 36 rotationally fixed with the hand tool housing 14 connected. The free-running areas 156 are areas of a surface of the planetary carrier 126 the second planetary gear stage 112 trained. When a tool torque is applied to the tool holder 38 When applied, the blocking agents clamp down. 150 between the first clamping surfaces 152 and the second clamping surface 154 If the drive unit 30 driving, the free-running areas 156 the blocking agents 150 on a circular path and prevent jamming. The planet carrier 126 the second planetary gear stage 112 and the connecting agent 128 are meshed together with play. The spindle locking device 36 is outside the gearbox housing 52arranged. The spindle locking device 36 is inside the percussion mechanism housing 56 arranged.

[0058] The torque limiting unit 34 is intended to be used in a screw mode, a tool attachment is independent of the insert tool fastening 38 to limit the maximum tool torque output. The torque limiting unit 34 The lifting device includes 160 , a control element 162 , Adjustment elements 164 , Limit springs 166 , a means of transmission 168 , first contact surfaces 170 , a second stop surface 172 and limiting means 174 The means of transmission 168 , the first contact surfaces 170 and the second stop surfaces 172 form a coupling of the torque limiting unit 34 . By means of the control element 162 is a maximum on the tool attachment 38Transmissible torque can be limited. The control element 162 The control element is ring-shaped. 162 It has a double-walled design. It closes towards the gearbox. 26 to the tool attachment 38 on. The control element 162 features slanted adjustment surfaces 176 on, which in the axial direction onto the adjusting elements 164 The adjustment elements are effective. 164 are rotationally fixed and controlled by the operating element 162 It is mounted so that it can be moved axially. A rotation of the control element 162 shifts the adjustment elements 164 in the axial direction.

[0059] The limit springs 166 are on one side of the adjustment element 164 supported. The limit springs 166 are on another page about the means of transmission 168 on the lifting device 160 the torque limiting unit 34supported. The transmission means 168 are mounted so that they can slide in the axial direction. One surface of the lifting device 160 indicates the first contact surfaces 170 up. The lifting device 160 is in screw mode in the axial direction against the limiting springs 166 Mounted in a movable manner.

[0060] The second stop surface 172 is defined as an area of ​​the surface of a hollow gear 178 the second planetary gear stage 112 trained. The second stop surface 172 limited trough-shaped depressions 180 The limiting means 174 are spherically shaped. The torque limiting unit 34 exhibits a limiting guidance device 182 on, which is intended to limit the means 174 to be mounted in a way that allows axial displacement. Fig. Figure 13 shows a cross-sectional area E of the limiting guide means. 182The limiting means guide 182 limited recesses 184 , in which the limiting means 174 in the direction of the blow 66 They are mounted in a sliding manner. The recesses 184 are tubular in shape. The striking mechanism gearbox housing 54 fastens the limiting guide device 182 Rotationally fixed. The limiting devices are in place during a screwing operation. 174 in the trough-shaped depressions 180 arranged. The limiting means 174 attach the hollow gear 178 the second planetary gear stage 112 Rotationally fixed. When the set maximum tool torque is reached, the limiting devices press against it. 174 the lifting device 160 against the limit springs 166 away. Then the limiting devices spring open. 174 each into the next of the trough-shaped depressions 180 The ring gear rotates during this process. 178the second planetary gear stage 112 , which interrupts the screwing process.

[0061] The torque limiting unit 34 features shutdown device 186 , 188 on, which are intended to limit the torque of the torque limiting unit 34 to switch off, thereby reducing the maximum torque of the drive unit. 30 depends. The adjusting element 164 and the means of transmission 168 each exhibit part of the shutdown devices 186 , 188 up. The shutdown devices 186 , 188 At least in one drilling mode, they prevent axial movement of the anchor device. 160 The shutdown devices 186 , 188 are formed as column-shaped projections onto the adjusting element 164 and the means of transmission 168 trained. The shutdown devices 186 , 188extend towards each other. The shutdown devices 186 , 188 are effective in parallel with the limiting springs 166 aligned. In a drilling position of the control element 162 the torque limiting unit 34 prevent the shutdown devices 186 , 188 an axial displacement of the lifting device 160 The adjusting element is... 164 so far in the direction of the transmission medium 168 postponed, so that the shutdown devices 186 , 188 are adjacent to each other.

[0062] Fig. Figure 14 shows a cross-sectional area F of the second planetary gear stage 112 The ring gear 178 the second planetary gear stage 112 At least during drilling operations, it is secured against a complete rotation in the hand tool housing. 14 Planetary gears (mounted) 190 the second planetary gear stage 112 comb with the ring gear178 and a sun wheel 192 the second planetary gear stage 112 .

[0063] Fig. Figure 15 shows a cross-sectional area G through a planetary support 194 the third planetary gear stage 114 . Fig. Figure 16 shows a cross-sectional area H through planetary gears 196 the third planetary gear stage 114 The sun wheel 192 the second planetary gear stage 112 is rotationally fixed to the planet carrier 194 the third planetary gear stage 114 connected. Planetary gears 196 the third planetary gear stage 114 combing with a sun wheel 198 and a ring gear 200 the third planetary gear stage 114 .

[0064] The ring gear 200 the third planetary gear stage 114 has an interlocking design 202 on, which the hollow gear 200 the third planetary gear stage 114In a first translation, rotationally fixed to the hand tool housing 14 connects. The interlocking. 202 of the ring gear 200 the third planetary gear stage 114 In the first translation, it engages with an internal toothing of a ring. 204 , which in turn is rotationally fixed to the hand tool housing 14 is connected.

[0065] Between the second planetary gear stage 112 and the third planetary gear stage 114 is a support device 206 arranged, which is intended to axially engage the ring gear 200 the third planetary gear stage 114 in particular through the torque limiting unit 34 caused force acting on the hand tool housing 14 to derive. The support device 206 is shaped like an annular disc. The support element 206 is over the ring 204 in one of the tool attachments 38axially directed, positively locked to the hand tool housing 14 connected by a snap ring 208 attaches the support device 206 in a one on the tool attachment 38 Axial direction to be indicated.

[0066] Fig. Figure 17 shows a cross-sectional area I through a planetary support 210 the fourth planetary gear stage 116 . Fig. Figure 18 shows a cross-sectional area J through planetary gears 212 the fourth planetary gear stage 116 The sun wheel 198 the third planetary gear stage 114 is rotationally fixed to the planet carrier 210 the fourth planetary gear stage 116 connected. The planetary gears 212 the fourth planetary gear stage 116 combing with a sun wheel 214 and a ring gear 216 the fourth planetary gear stage 116 The ring gear 216 the fourth planetary gear stage 116is rotationally fixed to the hand tool housing 14 connected. The ring gear 216 the fourth planetary gear stage 116 is one piece with one of the tool attachments 38 opposite gearbox housing cover 218 trained. The gearbox housing cover 218 can be integrated with the gearbox housing as a single piece 52 It is designed to be, but here it is designed separately. The gearbox housing cover 218 is done before the gearbox housing is fitted with parts 52 with the gearbox 26 with the gearbox housing 52 connected. The sun wheel 214 the fourth planetary gear stage 116 is rotationally fixed with a rotor 220 the drive unit 30 tied together.

[0067] The ring gear 200 the third planetary gear stage 114 is like in Fig. Figure 2 shows the gear being mounted so that it can be displaced axially. In the first gear ratio, the ring gear is 200the third planetary gear stage 114 rotationally fixed with the hand tool housing 14 connected. In the second translation, the ring gear is 200 the third planetary gear stage 114 rotationally fixed to the planet carrier 210 the fourth planetary gear stage 116 connected and relative to the hand tool housing 14 The planetary carrier is rotatably mounted. The planetary carrier also features... 210 the fourth planetary gear stage 116 an external gear tooth. This results in a reduction ratio of the first gear ratio between the rotor. 220 the drive unit 30 and the planetary carrier 194 the third planetary gear stage 114 , which is greater than the reduction ratio of the second gear. Thus, the tool holder rotates. 38 at a maximum speed of the drive unit 30Slower in first gear than in second gear. A component of the drive unit 30 on the tool attachment 38 The maximum achievable torque is greater in the first gear ratio than in the second. This is due to the drive unit. 30 on the tool attachment 38 The maximum achievable torque in the first gear ratio is 40 Nm. This is provided by the drive unit. 30 on the tool attachment 38 The maximum achievable torque in the second gear ratio is 14 Nm.

[0068] The gearbox housing cover 218 is made of a plastic. The gearbox housing cover 218 closes the gearbox housing 52 on the tool attachment 38 opposite side. The torque limiting unit 34 is intended to be used for the attachment of the tool inserts 38 side facing the gearbox housing52 to be closed in an operational state. The impact mechanism gearbox housing. 54 attached to the gearbox housing 52 the component of the torque limiting unit 34 , which is the attachment of the tool 38 side facing the gearbox housing 52 closed in an operational state. The limiting guide means 182 the torque limiting unit 34 closing the tool attachment 38 side facing the gearbox housing 52 in an operational state. The limiting guide means 182 is made of a metallic material. The gearbox housing 52 is from one of the tool attachments 38 facing side with at least the second, third and fourth planetary gear stage 112 , 114 , 116 of the gearbox 26 equipped.

[0069] The operating device 32 indicates a first control element 222 and a second control element 224 open. The first control element 222 is on one of the handles 18 far side of the hand tool housing 14 It is arranged parallel to the axial direction of the gearbox. 26 Movably mounted. The first control element 222 is via an adjustment device 226 the operating device 32 in the axial direction with the ring gear 200 the third planetary gear stage 114 connected. The ring gear 200 the third planetary gear stage 114 has a groove 228 up, into which the adjusting device 226 engages. Thus, the ring gear 200 the third planetary gear stage 114 with the adjusting device 226 relative to the adjusting device 226 The adjusting mechanism is connected and rotatable in the axial direction. 226It is designed to be spring-loaded, thereby changing the translation from one rotational position of the ring gear 200 the third planetary gear stage 114 can be adjusted independently. When the first control element 222 in the direction of the tool attachment 38 When the first control element is pushed, the first translation is set. 222 from the tool attachment 38 Once pushed aside, the second translation is set.

[0070] The second control element 224 is on one of the handles 18 far side of the hand tool housing 14 arranged. The second control element 224 is arranged to be displaceable about an axis that is parallel to the axial direction of the gearbox 26 is aligned. The second control element 224 The second control element mechanically activates or deactivates the impact drilling mode when pressed. 224is rotationally fixed to the control element 130 the hand tool device 12 connected. By means of the second control element 224 The screwdriving and drilling modes and the impact drilling mode are adjustable. If the second control element 224 in the direction of impact 66 When the second control is pushed to the left, the impact drilling mode is activated. 224 in the direction of impact 66 When viewed from the right, the screwing and drilling mode is activated.

[0071] The impact switch spring 140 the hand tool device 12 The impact cut-off clutch opens during impact drilling operation. 132 , when the operator lifts the tool from the workpiece. The impact spring 140 is coaxial to the planetary gear stages 110 , 112 , 114 , 116 of the gearbox 26 arranged. The second planetary gear stage 112and the third planetary gear stage 114 enclose the impact switch spring 140 each on at least one plane perpendicular to the axial direction of the gearbox 26 is aligned. The connecting element 128 supports the impact switch spring 140 on one of the tool attachments 38 facing side off. A storage device 230 supports the impact switch spring 140 on one of the tool attachments 38 away from the opposite side. The storage device 230 is shaped like a sphere. The bearing means 230 is between the impact spring 140 and the rotor 220 the drive unit 30 arranged.

[0072] The hand tool device 12 indicates a first recording unit 232 and a second recording unit 234 up. The first recording unit 232is intended to electrically output a parameter that depends on whether the percussion mechanism is active. 22 activated, meaning in impact drilling mode, or deactivated, meaning in drilling and screwdriving mode. The first detection unit 232 is designed as a switch that controls a movement of the second control element 224 relative to the hand tool housing 14 recorded. Alternatively, the recording unit could 232 a movement of another part of the percussion mechanism that would appear sensible to the expert 22 capture.

[0073] The second recording unit 234 It is intended to electrically output a second parameter that depends on which of the gear ratios of the transmission is selected. 26 by means of the first control element 222 is set. The first recording unit 234 is designed as a switch that transmits a movement of the first control element 222relative to the hand tool housing 14 recorded. Alternatively, the recording unit could 232 a movement of another part of the transmission that would appear sensible to a specialist 26 capture.

[0074] The hand tool device 12 a control unit 236 on, which is intended to mount the drive unit 30 to control a business. The control unit 236 It includes a microcontroller and power electronics. The power electronics are designed to control the drive unit. 30 to supply energy for different speeds and / or different torques. The microcontroller is designed to control the drive unit. 30 The control unit is controlled via the power electronics depending on the first and second parameters. 236 includes a protective function designed to prevent a maximum load from the drive unit30 The control unit limits the torque output in this operating mode when the impact drilling mode is activated and the first gear ratio (i.e., a low maximum speed and a high maximum torque) is selected. 236 a maximum of the drive unit 30 emitted electric current.

[0075] The hand tool device 12 features a percussion spindle bearing mechanism 238 up, which the striking mechanism spindle 60 on the tool attachment 38 The impact mechanism spindle bearing is rotatably mounted on the opposite side. 238 is fixed in the axial direction to the impact mechanism spindle 60 connected, namely the impact mechanism spindle bearing means 238 with the percussion spindle 60 Pressed in. Additionally or advantageously as an alternative, the impact mechanism spindle bearing could be 238 with the hand tool case 14be firmly connected in the axial direction.

[0076] The hand tool device 12 features a percussion spindle fastening device 242 on, which is intended to the striking mechanism spindle 60 to be fastened in the axial direction. The impact mechanism spindle fastening device 242 is designed as a snap ring. The impact mechanism spindle fastening device 242 engages in a groove 240 the percussion spindle 60 The groove 240 the percussion spindle 60 is on the tool attachment 38 far side of the percussion spindle 60 arranged.

[0077] In an operational state, the impact mechanism spindle fastening device 242 in the axial direction between the impact mechanism spindle bearing center 238 and the first planetary gear stage 110 arranged. The impact mechanism spindle fastening device 242attaches the percussion spindle 60 A positive locking connection in the axial direction. Alternatively, the impact mechanism spindle could be used. 60 It could be attached axially in another manner that would appear sensible to a person skilled in the art. For example, the impact mechanism spindle bearing could be... 238 in the axial direction, either materially bonded or force-fitted with the impact mechanism spindle 60 be connected.

Claims

[1] Hand tool device with a percussion mechanism ( 22 ), which is a racket ( 58 ), at least one curve ( 72 ), which at least in impact drilling operation the beater ( 58 ) drives, and at least one striking spring ( 62 ) exhibits which stores at least part of an impact energy in at least one operating state, characterized by that the striking spring ( 62 ) the racket ( 58 ) attached circumferentially in at least one operating state. [2] Hand tool device according to claim 1, characterized by that the striking spring ( 62 ) the racket ( 58 ) is attached during a clockwise rotation in the circumferential direction. [3] Hand tool device according to claim 1 or 2, characterized by that the racket ( 58 ) a fishing device ( 102 ) has, on which the striking spring ( 62 ) during a clockwise rotation in the circumferential direction. [4] Hand tool device according to claim 3, characterized by that the fishing device ( 102 ) and the striking mechanism spring ( 62 ) exhibit a formal closure in a circumferential direction during a right-hand run. [5] Hand tool device according to one of the preceding claims, characterized by that the racket ( 58 ) in a left-hand rotation, at least essentially exhibits a freewheel. [6] Hand tool device according to one of the preceding claims, characterized by that the racket ( 58 ) at least part of the curve ( 72 ) exhibits [7] Hand tool device according to one of the preceding claims, characterized by a tool spindle ( 40 ), which at least has a storage area ( 68 ) exhibits which in at least one operating state the beater ( 58 ) is stored in a movable manner. [8] Hand tool device according to one of the preceding claims, characterized by that the percussion (22 ) a percussion spindle ( 60 ) with a storage area ( 70 ) exhibits which in at least one operating state the beater ( 58 ) is stored in a movable manner. [9] Hand tool device at least according to claim 7, characterized by that the tool spindle ( 40 ) at least one striking surface ( 46 ) exhibits, on which the racket ( 58 ) at least when using a hammer drill. [10] Hand tool, in particular impact drill / driver, with a hand tool attachment ( 12 ) according to any of the preceding claims.

Images