DE102015210070A1 - Hand tool - Google Patents

Abstract

The invention relates to a hand tool (10), in particular a drill and / or chisel hammer (10 '), with a in a plastic motor housing (24) arranged fixed bearing device (50) consisting of at least one roller bearing (54) for rotatably supporting an armature shaft (46) and for this purpose comprises at least one outer ring (56) and one inner ring (58), wherein the inner ring (58) is fixedly connected to the armature shaft (46). It is proposed that a first part (64) of the at least one rolling bearing (54) is pressed into a bearing seat (62) provided in the motor housing (24) in the axial direction of the armature shaft (46) and a second part (68) of the at least a rolling bearing (54) is fixed radially and / or axially by means of a made of an elastomeric plastic material rubber bushing (66).

Description

State of the art

There are known power tools with a fixed bearing device for rotatably supporting an armature shaft.

Disclosure of the invention

The invention relates to a hand tool, in particular a drill and / or chisel, with a arranged in a plastic motor housing fixed bearing device consisting of at least one roller bearing, which is provided for rotatably supporting an armature shaft and thereto comprises at least one outer ring and an inner ring , wherein the inner ring is fixedly connected to the armature shaft.

It is proposed that a first part of the at least one roller bearing is pressed into a bearing housing provided in the motor housing in the axial direction of the armature shaft and a second part of the at least one roller bearing is fixed radially and / or axially by means of a rubber bushing made of an elastomeric plastic material ,

A hand-held power tool should be understood as meaning all hand-held power tools deemed appropriate by a person skilled in the art, in particular percussion drills, demolition hammers, rotary hammers, impact hammers, impact drills and / or preferably rotary and / or chisel hammers.

The portable power tool has a fixed bearing device arranged in a plastic motor housing, which is provided to rotatably support an armature shaft of the motor. The armature shaft is used in an exemplary embodiment of the power tool to drive a functional component of the power tool, such as a connecting rod, which in turn drives a striking mechanism or a rotating tool holder of the power tool.

Under the fixed bearing device of the power tool to be understood in particular a radial bearing or a rotary bearing device, which is intended to rotatably support a rotatably mounted in particular axially to the fixed bearing device armature shaft of the motor about its own longitudinal axis. In addition, the fixed bearing device is provided to counteract a translational movement of the armature shaft in the direction of its axial extent, preferably to prevent a translational movement of the armature shaft in the direction of its axial extent.

The fixed bearing device thus allows a rotation of the armature shaft about its own longitudinal axis, while preventing a translational movement of the armature shaft in the direction of its longitudinal axis. Furthermore, all other degrees of freedom, in particular, for example, a translational movement of the armature shaft in the radial direction of a circular cross section of the armature shaft, are preferably greatly restricted, preferably prevented. To realize such a bearing of the armature shaft, the fixed bearing device has at least one roller bearing.

It should be noted at this point that the term "axial" or "axial direction" means in particular "in the direction of the axial extent of the armature shaft". In contrast, "radial" or "in the radial direction" means a radial direction perpendicular to the axial direction.

In the at least one rolling bearing between a inner ring and an outer ring rolling or rolling rolling elements reduce a frictional resistance in a relative movement of the outer ring and the inner ring to each other. In this case, the at least one roller bearing is used on the armature shaft such that the inner ring of the radial roller bearing is fixedly connected to the armature shaft or provided to be firmly connected to the armature shaft, in particular to be firmly connected to the armature shaft. "Fixed" means in particular "rotationally fixed" and in the axial direction "safe to move". "Rotationally fixed" in this context means that the inner ring is not slidably mounted or slidable relative to the armature shaft in the direction of the circumference of the inner ring, but is rotatably connected with a rotational movement of the armature shaft. In this context, "displacement-proof" means that the inner ring is not slidably mounted or slidable relative to the armature shaft in the direction of its axial extension. Such a non-rotatable and non-shift connection can be realized in a preferred embodiment of the fixed bearing device, for example by screwing, gluing, welding or by any other, a person skilled in the appearing appropriate connection technology, a non-rotatable and non-shifting, preferably material, power and / or positive connection of armature shaft and roller bearings, in particular of the armature shaft and inner ring of the bearing allows.

The outer ring of the rolling bearing preferably serves to guide and / or align the at least one roller bearing with respect to a component surrounding the at least one rolling bearing, in particular with respect to a motor housing of the hand tool, preferably with respect to a bearing seat provided in the motor housing of the hand tool. Such serves the outer ring of the at least one bearing of the guide and Alignment of the means of at least one rolling bearing rotatably mounted armature shaft. Furthermore, in an advantageous embodiment, the outer ring of the at least one rolling bearing is provided for fixing the at least one rolling bearing in or on a component surrounding the at least one rolling bearing, in particular in or on the motor housing of the handheld power tool, preferably in or on the bearing seat provided in the motor housing to enable. Such a free rotation of the armature shaft relative to the motor housing, preferably based on the bearing seat of the motor housing can be realized.

The at least one roller bearing is thus provided to allow the rotation of the armature shaft in the hand tool, advantageously further reduce a frictional resistance during rotation of the armature shaft, and a connection of the armature shaft in or on another component of the power tool, in particular in or on the Motor housing of the power tool, to enable.

In a preferred embodiment, the at least one roller bearing is realized as a radial ball bearing or a radial roller bearing. Using radial ball or roller bearings can advantageously be realized a particularly smooth, in particular almost frictionless rotational movement of the armature shaft about its own longitudinal axis.

The hand tool has a motor housing made of a plastic material, which is intended to enclose a motor of the power tool and protect against external influences, such as the ingress of dust or moisture or the like.

According to the invention, a first part of the at least one roller bearing is pressed into the bearing housing provided in the motor housing in the axial direction of the armature shaft and a second part of the at least one roller bearing radially and / or axially fixed by means of a rubber bushing made of an elastomeric plastic material.

The bearing seat, in particular the bearing seat of the fixed bearing device, is intended to receive the at least one rolling bearing and in particular to enclose in the direction of the circumference of the outer ring. The bearing seat is integrated in the plastic motor housing of the hand tool, preferably in the housing shell of the motor housing.

A first part of the at least one roller bearing is pressed into the bearing seat in the axial direction of the armature shaft, in particular pressed with excess on block, and thus fixed in the bearing seat and advantageously in the motor housing. In particular, the at least one roller bearing is mounted and arranged in the bearing seat with a "press fit" or a "press fit". The bearing seat thus serves to connect and fix the at least one rolling bearing, in particular its outer ring, in the motor housing. The bearing seat establishes the connection between the at least one roller bearing and the motor housing of the handheld power tool and in this way secures the armature shaft mounted in the at least one roller bearing in the motor housing of the handheld power tool. The bearing seat of the fixed bearing device also serves to guide the at least one rolling bearing in the radial direction and preferably also in the axial direction. Using the bearing seat, the at least one rolling bearing and the rotatably mounted in the at least one roller bearing armature shaft, a stable arrangement and fixation of the armature shaft in the motor housing of the power tool can be realized, at the same time a rotation of the armature shaft relative to the motor housing is possible without restriction.

Advantageously, radial forces, which are transmitted from the armature shaft via the at least one rolling bearing on the bearing seat, absorbed by the bearing seat and / or forwarded to the motor housing, so that movement of the armature shaft in one of the direction of action of the force corresponding, in particular radial, direction suppressed becomes.

By injecting the at least one rolling bearing in the axial direction into the bearing seat, an introduction of the at least one rolling bearing can be carried out in a particularly simple manner and thus the mountability of the fixed bearing device can be facilitated. In an advantageous embodiment of the power tool, the fixed bearing device together with the armature shaft can be introduced in a particularly simple and economically favorable manner into the motor housing of the power tool in the axial direction.

A second part of the at least one roller bearing is fixed radially and / or axially by means of a rubber bushing made of an elastomeric plastic material. The rubber bushing is preferably made of elastomeric plastic material and therefore represents a dimensionally stable but nevertheless elastically deformable component under the action of force. Elastomerates of natural rubber and / or silicone rubber are preferably to be understood as meaning an elastomeric plastic material. Advantageously, a compact, cost-effective and economically easily manufacturable rubber bushing can thus be realized. Alternatively, another plastic material, which appears reasonable to a person skilled in the art, can also be used to manufacture the rubber bushing, provided that the plastic material fulfills the required requirements Has properties in terms of dimensional stability and elastic deformability.

The rubber bushing according to the invention is used to fix the at least one rolling bearing in the radial and / or axial direction, preferably the fixation of the at least one rolling bearing in the radial and / or axial direction in the bearing seat. Advantageously, in addition to the fixation of the at least one rolling bearing as a result of pressing into the bearing seat, a fixation in the radial and / or axial direction is realized using the rubber bushing.

Particularly advantageous can be overcome in this way known from the prior art disadvantages. With the fixed bearing device according to the invention, disadvantages which in the case of realization of a fixed bearing device of the armature shaft can be achieved only by using a press fit of the at least one roller bearing in the bearing seat - i. without using a rubber bushing - occur, overcome. In particular, production-related tolerances, for example precision deficits in the injection molding production of the plastic motor housing and thus also precision deficits of the bearing seat, can be at least partially compensated or compensated for using the rubber bushing. A more precise guidance of the at least one roller bearing and thus of the armature shaft can be advantageously achieved. Also, material-related expansions or shrinkages, in particular expansions or shrinkages of the bearing seat, using the rubber bushing advantageously compensate or compensate at least partially. Such material-related expansions or shrinkages can be induced, for example, by temperature fluctuations and / or mechanical deformations of the fixed-bed device. Using the rubber bushing according to the invention, the at least one roller bearing of the fixed bearing device can be arranged, aligned, guided and preferably fixed in a precise and stable manner in the bearing seat in the radial and / or axial direction independently of manufacturing tolerances, temperature-induced changes in size or the like.

Furthermore, with the fixed bearing device according to the invention disadvantages that occur in a realization of a fixed bearing device of the armature shaft only using a rubber component for fixing the at least one roller bearing in the motor housing, can be overcome. Thus, it is known that such rubber components still have a slight compliance even in the installed and strained state, so that the bearing during operation of the power tool inside the motor housing can perform unwanted movements, including negative effects on the life of the engine, of gears , Bearings and the like and thus have on the life of the power tool.

In contrast, in the proposed fixed bearing device, the first part of the at least one roller bearing has an interference fit in the bearing seat, while the second part of the at least one roller bearing is fixed radially and / or axially by means of the rubber bushing. In this way, the at least one rolling bearing will be both press fit - i. with particularly precise guidance in the bearing seat - as well as elastically by means of the rubber bushing - and thus tolerance-independent or tolerance-compensating - fixed in the bearing seat. Thus, it can be ensured that the fixed bearing is permanently guided and fixed very precisely and stably, in particular unyielding, in the bearing seat of the motor housing. Dimensional changes due to manufacturing tolerances and / or temperature fluctuations are advantageously compensated by the rubber bushing. Preferably, the tension of the bearing through the rubber bushing is so high that the interference fit of the at least one roller bearing is retained in the bearing seat of the motor housing over the life of the power tool. A deflection and / or tumbling of the fixed bearing device in the bearing seat can advantageously be permanently prevented.

In addition, the direct, accurately fitting radial support of the at least one rolling bearing by the bearing seat allows to dispense with further, in particular more complex and toleranced components for realizing the precise radial guidance and / or alignment of the at least one rolling bearing. Thus, a particularly simple, cost-effective and at the same time particularly precise guidance, alignment and fixation of the at least one roller bearing in the bearing seat, in particular in the motor housing, is also possible without the use of further components subject to tolerances.

Furthermore, in addition to the at least one rolling bearing further rolling bearings for more stable, in particular tilt-stable storage of the armature shaft can be provided. Preferably, these other rolling bearings, in particular a second rolling bearing, at least rotatably connected to the armature shaft. Other bearings can be realized in particular analogously in the form of a fixed bearing device and / or in the form of a floating bearing device for rotatably supporting the armature shaft.

The invention thus further relates to a hand tool, in particular a drill and / or chisel, with a double bearing device for rotatably supporting an armature shaft, consisting of at least one fixed bearing device according to the invention and a movable bearing device.

The double bearing device according to the invention can preferably be used in the storage of armature shafts in power tools. In this case, in an exemplary embodiment of a double bearing device, a fixed bearing device according to the invention is combined with a floating bearing device. The fixed bearing device serves the one-sided locking of the armature shaft in the axial direction, while the floating bearing device permits a free change in length of the armature shaft locked on one side as a result of a sliding seat. Advantageously can be realized in this way a bearing of the armature shaft in the double bearing device, which does not allow an axial movement of the armature shaft relative to the entire double bearing device, for example due to an alternating load during rotation of the armature shaft, in particular during operation of the transmission device. A one-sided movement of the armature shaft in the movable bearing device of the double bearing device, in particular as a result of thermal expansion of the armature shaft, however, is possible.

In this way, an economically particularly favorable and easy to assemble double bearing device for rotatably supporting an armature shaft for hand tool machines using at least one fixed bearing device according to the invention and a floating bearing device can be realized.

In a preferred embodiment of the portable power tool, the rubber bushing is biased radially and / or axially elastically by means of a counter-mounting as a result of elastic deformation of the rubber bushing, in particular a compression of the rubber bushing.

By counter-mounting is meant a device intended to resiliently bias the rubber bushing by providing an external force acting on the rubber bushing. Advantageously, a countermounting can be realized as a component which compresses, clamps, compresses, compresses, shears, twistes, or exerts another rubber force bushing, which appears reasonable to the skilled person, to the rubber bushing.

The rubber bushing is preferably made of elastomeric plastic material and thus represents a dimensionally stable, yet elastically deformable component. In particular, the rubber bushing under the action of an external force, for example, tensile and / or compressive load, elastically deform. Advantageously, the elastomeric plastic material counteracts a mechanical action, in particular a deformation, compression, compression, shearing, torsion or the like. In this case, the rubber bushing exerts due to the external force of an external force counteracting elastic expansion force. Advantageously, this elastic expansion force acts on such components of the fixed bearing device, which exert on the rubber bushing a compressing the rubber bushing, upsetting, shearing order tordierende action. In this way, the surface of the rubber bushing can be used as an elastic stop and / or as a contact and / or support for adjacent to the rubber bushing components. Advantageously, the rubber bushing exerts an elastic expansion force on the rubber bushing adjacent, in particular pressed to the rubber bushing components.

In a preferred embodiment of the power tool, the rubber bushing is biased radially and / or axially resiliently by means of the counter-mounting and consequently exerts an expansion force in the radial and / or axial direction on the rubber bushing adjacent components, preferably the at least one rolling bearing from.

In a preferred embodiment of the portable power tool, the second part of the at least one roller bearing is fixed radially and / or axially in the bearing seat by means of the rubber bushing as a result of an elastic, in particular homogeneously acting, expansion force of the rubber bushing.

A guide and stabilization or support of the at least one rolling bearing and thus the armature shaft only in the realized plastic bearing seat in the motor housing is not sufficient in powerful hand tool machines. The motor, the armature shaft and the at least one rolling bearing heat up due to the high power consumption of the engine, so that the plastic material of the motor housing - and thus the bearing seat - thermally expand. As a result of the expansion, a precise and stable guidance of the at least one roller bearing and thus of the armature shaft is not possible, there is the danger of a deflection and / or tumbling of the armature shaft. This effect is significantly enhanced in hitting manual power tools, such as drill and chisel hammers, due to a high mechanical vibration load.

In order to ensure a permanent fixation of the at least one rolling bearing nevertheless, the rubber bushing according to the invention is provided for fixing the at least one roller bearing in the radial and / or axial direction in the bearing seat. In particular, the rubber bushing of the fixation of the outer ring of the at least one serves Rolling in the bearing seat. By fixing the outer ring of the at least one rolling bearing, in particular by fixing the outer ring of the at least one rolling bearing relative to the bearing seat, in addition to a torsion-proof arrangement of the outer ring of the at least one rolling bearing in the bearing seat and a displacement-proof arrangement in the radial and / or axial direction and thus realized fixation of the outer ring of the at least one rolling bearing in the bearing seat.

In one embodiment, the expansion force of the rubber bushing acts homogeneously in the radial direction on the at least one roller bearing, in particular on its outer ring. By using the rubber bushing thus a permanent radial fixation can be advantageously realized, which preferably acts on the outer ring over the entire length of the circumference of the outer ring of the at least one rolling bearing. Preferably, the at least one rolling bearing is mechanically stable due to the homogeneously acting expansion force of the rubber bushing, in particular in the radial direction torsion and / or bending stiff, arranged and fixed in the bearing seat. A particularly stable and torsionally strong bond between the outer ring of the at least one rolling bearing and the bearing seat can be achieved in this way, in which the outer ring of the at least one rolling bearing can not rotate and move relative to the bearing seat. In addition, can be realized with the high torsional and / or bending stiffness of at least one rolling bearing advantageously a torsion and / or bending resistant fixed bearing device. Advantageously, forces transmitted by the armature shaft to the at least one rolling bearing and thus to the fixed bearing device, in particular forces acting in the radial direction, can be absorbed and absorbed. In this way, the rubber bushing of the stable fixation of the means of at least one rolling bearing rotatably or rotatably mounted armature shaft in the radial direction, wherein the rotational movement or rotation of the armature shaft is not limited. The stability of the fixed bearing device also has an advantageous effect on the entire armature shaft and thus on the entire hand tool machine and thus has a decisive influence on their quality and stability.

In an alternative or additional embodiment, the rubber bushing serves for the axial clamping or fixing of the at least one roller bearing in the bearing seat. As a result of pressing the at least one rolling bearing into the bearing seat of the fixed bearing device, a principal displaceability of the at least one rolling bearing in the axial direction in the bearing seat is not provided, but nevertheless possible in principle, for example as a result of continuous vibrations of the power tool. The rubber bushing forms a fixing element of the fixed bearing device, which is intended to prevent axial mobility of the at least one rolling bearing of the fixed bearing device and thus to fix the at least one rolling bearing in the bearing seat. In a preferred embodiment of the fixed bearing device according to the invention a tension of the at least one roller bearing is realized in the axial direction as a result of an exerted by the rubber bushing on the at least one rolling bearing elastic homogeneous expansion force. In particular, a tensioning force exerted in consequence of the elastic expansion force of the ring in the axial direction thus acts on the at least one roller bearing.

In a preferred embodiment of the portable power tool, the rubber bushing is at least partially inserted between the at least one rolling bearing and the bearing seat in the motor housing.

The at least partial introduction of the rubber bushing between the at least one rolling bearing and the bearing seat in the motor housing allows to realize a particularly compact and thus space-saving arrangement of the rubber bushing. Further, it is thus possible to increase the bearing surface of the rubber bushing on the at least one rolling bearing, in particular its outer ring. A more uniform and stable fixation of the at least one roller bearing, both in the radial and in the axial direction, is achievable and consequently reduces the risk of deflection and / or tumbling of the at least one roller bearing in the bearing seat. Thus, the risk of knocking and / or tumbling of the rotatably mounted by means of the fixed bearing device armature shaft is advantageously reduced.

In addition, the at least partial introduction of the rubber bushing between the at least one rolling bearing and the bearing seat in the motor housing allows a particularly uniform, in particular homogeneous distribution of the force exerted by the rubber bushing expansion force. A division of the expansion force into an axial and a radial component can be advantageously achieved and leads to a more effective fixation of the at least one rolling bearing.

In a preferred embodiment of the power tool, the rubber bushing is in the radial and / or axial direction of the second part of the at least one rolling bearing.

In this way, a particularly uniform, in particular acting homogeneously in the radial and / or axial direction expansion force of the rubber bushing can be realized. A durable, particularly durable and stable radial and / or axial Fixation can be realized, which preferably acts on the outer ring over the entire length of the circumference of the outer ring of the at least one roller bearing in the radial and / or axial direction. A division of the expansion force into an axial and a radial component can be advantageously achieved and leads to a more effective fixation of the at least one rolling bearing, so that the at least one rolling bearing is mechanically stable fixed by the homogeneously acting radial and / or axial expansion force of the rubber bushing.

In a preferred embodiment of the portable power tool, the first and the second part of the at least one roller bearing each form 50% of the axial extent of the at least one roller bearing.

Thus, a particularly stable fixation of the at least one roller bearing can be achieved in the bearing seat. One half of the at least one roller bearing relative to its expansion in the axial direction serves in this way the mechanically stable guidance of the at least one rolling bearing in the bearing seat and is fixed with a press fit in the bearing seat. This part serves to guide the at least one roller bearing in the bearing seat in a particularly precise and preferably stable and unyielding manner, in particular to absorb and absorb forces transmitted by the armature shaft to the at least one roller bearing. The second half of the at least one roller bearing relative to its expansion in the axial direction serves for the elastic fixation and compression of the at least one roller bearing by means of the rubber bushing in the radial and / or axial direction. This part brings about the tolerance-independent or tolerance-compensating compression, fixation and guidance of the at least one roller bearing in the bearing seat and thus a compensation of dimensional changes due to manufacturing tolerances and / or temperature fluctuations.

The division into half parts allows to achieve a particularly stable and thus permanently acting distribution of forces. It should nevertheless be noted that deviations from this half-division can be used. The preferred proportions depend in particular on the exact shape of the bearing seat, the rubber bushing and the performance of the engine.

In a preferred embodiment of the power tool, the rubber bushing has a rotationally symmetrical shape.

The rotationally symmetrical design of the rubber bushing allows to simplify the mounting of the rubber bushing in the fixed bearing device and to preclude an improper arrangement, in particular a twisted arrangement of the rubber bushing. In this way, thus a source of error in the assembly of the rubber bushing of the fixed bearing device can be excluded. Furthermore, it is possible to achieve a radial and / or axial expansion force of the rubber bushing acting particularly homogeneously on the at least one roller bearing.

drawings

The invention is explained in more detail with reference to embodiments illustrated in the drawings in the following description. The drawings, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations. Like reference numerals in the figures indicate like elements.

Show it:

1 a schematic side view of a power tool in the form of a hammer drill

2 a schematic sectional view of the power tool according to 1

3 an enlarged schematic sectional view of a fixed device according to the invention of the power tool

1 shows a hand tool 10 exemplified as a drill and / or chisel hammer 10 ' is trained. It should be noted that the embodiments do not refer to a rotary hammer and / or chisel hammer 10 ' limited understood, but the underlying technical explanations on principle, in any other, a skilled worker seem appropriate hand tool machines 10 , In particular, for example, impact drills, demolition hammers, impact wrench or the like, are transferable.

The drill and / or chisel hammer 10 ' has a machine housing 12 on, that has an interior 14 of the hammer drill 10 ' encloses, in the at least one drive mechanism 16 is arranged. Furthermore, the hand tool has 10 a main handle 18 , an additional handle 20 , a tool holder 22 , in particular a drill chuck, and a motor housing 24 for receiving a motor, not shown, in particular an electric motor on. The main handle 18 is on one of the tool holder 22 opposite side of the machine housing 12 with the machine housing 12 and the motor housing 24 connected. The auxiliary handle 20 is on one of the tool holder 22 facing side of the hammer drill 10 ' with the machine housing 12 connected. Both handles serve the stable and safe operation and guidance of the hammer drill 10 ' operational. The tool holder 22 serves to receive a drill and / or a chisel tool.

The hand tool machine 10 , in particular the rotary and / or chisel hammer 10 ' , has a power connection to its power supply 26 on. In an alternative or additional embodiment of the power tool 10 can also be a power supply independent operation of the power tool 10 be provided using an accumulator.

2 shows a section of the drill and / or chisel hammer 10 ' in a schematic section through the machine housing 12 and the motor housing 24 , Both housing components have a housing shell 28 on. In the interior 14 of the machine housing 12 is the drive mechanism 16 arranged. The interior 14 has a lubricant, so in the interior 14 an all-round, permanent lubrication of the mechanical components, in particular the drive mechanism 16 , is guaranteed.

The drive mechanism 16 has at least one striking mechanism 30 and a first transmission device 32 and a second transmission device 34 for a drilling and a hammer operation of the drill and / or chisel hammer 10 ' on. The percussion 30 of the drill and / or chisel hammer 10 ' is advantageously designed as a hammer blower. The first transmission device 32 is as a transmission device for driving the percussion 30 executed. The percussion 30 also has a piston 36 , a hammer tube 38 and a bat, not shown, as well as a striker also not shown. The operation of such a striking mechanism 30 is known in the art. The piston 36 is by means of a connecting rod 40 with the transmission device 32 , in particular an eccentric wheel 42 the transmission device 32 mechanically movably connected.

The transmission device 32 is in connection with the striking mechanism 30 the hand tool machine 10 , in particular the hammer impact mechanism provided, a drive of the connecting rod 40 to realize, in turn, the percussion 30 the hand tool machine 10 drives. In this way, a drill moves (not shown) during operation of the drill and / or chisel 10 ' at least in the direction of its axial extent 44 , one by means of the percussion mechanism 30 generated impact energy is transmitted via the drill to a material to be processed. In this case, by means of the transmission device 32 a rotational movement of the armature shaft 46 of the engine in a stroke movement of the piston 36 , Racket and striker in the axial direction 44 of the hammer tube 38 implemented. The thereby periodically moved forward racket hits the firing pin and gives off its kinetic energy, the pulse of the racket from the firing pin on one in the tool holder 22 used drill or chisel is transferred.

The second transmission device 34 drives the hammer tube 38 preferably rotating to the in the tool holder 22 introduced drill during operation of the drill and / or chisel hammer 10 ' to rotate. The rotary motion of the hammer tube 38 is through a switching mechanism 48 in a manner that appears appropriate to a person skilled in the art, can be switched on and / or adjusted and / or switched off. In particular, the second transmission device via a coupling device, not shown, to the armature shaft 46 coupled.

In 3 is one in the 2 marked area as a section through the drill and / or chisel hammer 10 ' , in particular its motor housing 24 , which shows a fixed storage device according to the invention 50 the armature shaft 46 the motor of the hammer and / or chisel 10 ' reproduced in detail.

The armature shaft 46 is by means of the fixed storage device according to the invention 50 stored in the engine. The fixed storage device 50 represents a radial bearing or pivot bearing device, by means of which the axial to the fixed bearing device 50 arranged armature shaft 46 is rotatable or rotatable about its own longitudinal axis. The fixed storage device 50 prevents a translatory movement of the armature shaft 46 in the direction of their axial extent 52 ,

The fixed storage device 50 consists of at least one rolling bearing 54 , which is designed as a radial ball bearing. The at least one rolling bearing 54 is for rotatable mounting of the axial to the rolling bearing 54 arranged armature shaft 46 intended. The at least one rolling bearing 54 , in particular the radial ball bearing, has for this purpose at least one outer ring 56 and an inner ring 58 on, with the inner ring 58 by means of a lock nut 60 or lock nut firmly, in particular against rotation and displacement, with the armature shaft 46 is screwed. Thus, this is at least one rolling bearing 54 , In particular, the at least one radial ball bearing provided, the rotation of the armature shaft 46 to allow and further a frictional resistance upon rotation of the armature shaft 46 advantageous to reduce.

Next, the fixed bearing device 50 for the armature shaft 46 a bearing seat 62 on, in which at least one rolling bearing 54 , here the at least one radial ball bearing, in the axial direction 52 Pressed, in particular with excess is pressed on block. The bearing seat 62 is integral, in particular positive and cohesive, with the motor housing 24 the hand tool machine 10 manufactured. The bearing seat 62 encloses the outer ring 56 of the at least one roller bearing 54 while in the direction of its scope. The bearing seat 62 the fixed storage device 50 represents the leadership of the outer ring 56 of the at least one roller bearing 54 in the radial direction. Furthermore, the bearing seat connects 62 the at least one rolling bearing 54 with the motor housing 24 , Thus, the armature shaft 46 in the motor housing 24 using the bearing seat 62 arranged and fixed, with a free rotation of the armature shaft 46 relative to the motor housing 24 the hand tool machine 10 unrestricted is possible.

The motor housing 24 provides the for receiving the engine of the power tool 10 provided part of the housing shell 28 In the embodiment shown, the motor housing 24 designed as a one-piece plastic die-cast motor housing into which the bearing seat 62 is integrated.

In the in the motor housing 24 arranged bearing seat 62 is that at least a rolling bearing 54 the fixed storage device 50 with a first part 64 based on its extension in the axial direction 52 Pressed, in particular with excess pressed on block. The first part 64 of the at least one roller bearing 54 corresponds to half of the at least one rolling bearing 54 , In particular, half of the component depth based on its extension in the axial direction 52 , In this way, these are at least one rolling bearing 54 and thus the fixed storage device 50 both radially and axially directly without additional, especially tolerant components very precise in the plastic motor housing 24 stored and guided. Furthermore, these are at least one roller bearing 54 and thus the fixed storage device 50 stable and non-tilting in the motor housing 24 guided and therefore the entire engine stable and tip over with respect to the motor housing 24 aligned and in the motor housing 24 guided.

Radial forces coming from the armature shaft 46 about the at least one rolling bearing 54 on the bearing seat 62 are transferred from the bearing seat 62 on the motor housing 24 forwarded and absorbed there. Consequently, there is a movement of the armature shaft 46 in a direction of action of the force corresponding radial direction impossible.

A guide and stabilization or support of the at least one rolling bearing 54 and thus the armature shaft 46 only in the plastic bearing seat realized 62 in the motor housing 24 is with powerful hand tool machines 10 unsatisfactory. On the one hand, the engine heats up, the armature shaft 46 and that at least one rolling bearing 54 due to the high power consumption of the engine strong, so that the plastic material of the motor housing 24 - and thus the bearing seat 62 - Thermally deform, in particular expand. As a result of the deformation is a precise and stable guidance of the at least one rolling bearing 54 and thus the armature shaft 46 not possible, the risk of knocking out and tumbling of the armature shaft 46 consists. This effect is in strikingly working hand tool machines 10 , in particular for drilling and chipping hammers 10 ' , due to a high vibration load even more.

To a permanent fixation of the at least one rolling bearing 54 to ensure is an elastically preloaded rubber bushing 66 introduced for further fixation. The rubber bushing 66 is made of elastomeric plastic and has a rotationally symmetrical shape.

The rubber bushing 66 represents a dimensionally stable, yet elastically deformable component. In particular, can the rubber bushing 66 under the action of an external force, for example under tensile and / or compressive load, deform elastically, wherein the elastomeric plastic material counteracts a mechanical action, in particular deformation, compression, shear, torsion or the like, and thereby an external expansion force directed counter to the external expansion force exercises. In particular, the rubber bushing is used 66 as a stop for an adjacent, in particular pressed-on component, as a result of an elastic deformation, in particular compression, deformation, compression, shearing and / or torsion of the rubber bushing 66 , an elastic expansion force is applied. The rubber bushing 66 is between the at least one rolling bearing 54 and the camp seat 62 in the motor housing 24 introduced and surrounds the at least one rolling bearing 54 both axially and radially on a second part 68 of the at least one roller bearing 54 , the second part 68 the other half of the at least one rolling bearing 54 equivalent. On to the motor housing 24 screwed on brush cover 70 ' acts as a countermount 70 holding the rubber bushing 66 Elastic biased by the rubber bushing 66 compresses and compresses and thus compresses. As a result of the radial and axial elastic preload of the rubber bushing 66 this exerts a high expansion force in the radial and axial directions on the at least one rolling bearing 54 out.

The rubber bushing 66 fixes the at least one rolling bearing 54 , in particular its outer ring 56 , in the radial and axial direction in the bearing seat 62 , As a result, in addition to a rotationally secure arrangement of the outer ring 56 of the at least one roller bearing 54 in the camp seat 62 also a displacement-safe arrangement of the outer ring in the radial and axial directions 56 of the at least one roller bearing 54 in the camp seat 62 realized. The use of the rubber bushing 66 allows the permanent fixation of the at least one rolling bearing 54 in the camp seat 62 , Through a homogeneous acting expansion force of the rubber bushing 66 is that at least a rolling bearing 54 mechanically stable in this way, in particular in the radial direction torsion and / or bending stiff, in the bearing seat 62 arranged and fixed. In addition to the press fit, this will be at least one rolling bearing 54 thus also elastically biased and fixed in the radial and axial directions.

The at least one rolling bearing 54 the fixed storage device 50 is due to the pressed rubber bushing 66 permanently fixed in the axial and radial directions. In this case, due to the radially and axially acting elastic expansion force, a radial and axial tension of the at least one rolling bearing 54 in the camp seat 62 of the motor housing 24 , which leads to a rotation and a fixation of the outer ring 56 of the at least one roller bearing 54 in the camp seat 62 leads. In this way, this will be at least one rolling bearing 54 by pressing the rubber bushing 66 mechanically stabilized and in the motor housing 24 or in the bearing seat 62 attached.

Claims (7)

Hand tool machine ( 10 ), in particular drill and / or chisel hammer ( 10 ' ), with one in a plastic motor housing ( 24 ) arranged fixed bearing device ( 50 ), consisting of at least one rolling bearing ( 54 ), for the rotatable mounting of an armature shaft ( 46 ) is provided and at least one outer ring ( 56 ) and an inner ring ( 58 ), wherein the inner ring ( 58 ) fixed to the armature shaft ( 46 ), characterized in that a first part ( 64 ) of the at least one roller bearing ( 54 ) in a in the motor housing ( 24 ) provided bearing seat ( 62 ) in the axial direction of the armature shaft ( 46 ) and a second part ( 68 ) of the at least one roller bearing ( 54 ) by means of a made of an elastomeric plastic material rubber bushing ( 66 ) is fixed radially and / or axially. Hand tool machine ( 10 ) according to claim 1, characterized in that the first part ( 64 ) and the second part ( 68 ) of the at least one roller bearing ( 54 ) each 50% of the axial extent of the at least one rolling bearing ( 54 ) form. Hand tool machine ( 10 ) according to one of the preceding claims, characterized in that the rubber bushing ( 66 ) at least partially between the at least one roller bearing ( 54 ) and the bearing seat ( 62 ) in the motor housing ( 24 ) is introduced. Hand tool machine ( 10 ) according to one of the preceding claims, characterized in that the rubber bushing ( 66 ) in the second part ( 68 ) of the at least one roller bearing ( 54 ) rests in the radial and / or axial direction. Hand tool machine ( 10 ) according to one of the preceding claims, characterized in that the rubber bushing ( 66 ) has a rotationally symmetrical shape. Hand tool machine ( 10 ) according to one of the preceding claims, characterized in that the rubber bushing ( 66 ) by means of a counter-mounting ( 70 ) as a result of elastic deformation of the rubber bushing ( 66 ), in particular a compression of the rubber bushing ( 66 ), is biased radially and / or axially elastically. Hand tool machine ( 10 ) according to one of the preceding claims, characterized in that the second part ( 68 ) of the at least one roller bearing ( 54 ) by means of the rubber bushing ( 66 ) as a result of an elastic, in particular homogeneous-acting, expansion force of the rubber bushing ( 66 ) radially and / or axially in the bearing seat ( 62 ) is fixed.

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