CN109476007B

CN109476007B - Hand-held machine tool device

Info

Publication number: CN109476007B
Application number: CN201780043225.7A
Authority: CN
Inventors: J·布卢姆; D·绍尔; T·赫尔
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2016-07-11
Filing date: 2017-07-11
Publication date: 2022-10-28
Anticipated expiration: 2037-07-11
Also published as: EP3481596B1; WO2018011204A2; CN109476007A; DE102017211773A1; EP3481596A2; WO2018011204A3

Abstract

The invention proposes a hand-held machine tool device having a drive unit (12a. The invention proposes that the fan wheel (38a, 38b) and the rotational impact mechanism (1694.

Description

Hand-held machine tool device

Background

A handheld power tool device has already been proposed, which has a drive unit with a drive shaft, at least one rotary percussion mechanism and at least one cooling air unit with at least one fan wheel arranged between the drive unit and the rotary percussion mechanism.

Disclosure of Invention

The invention relates to a hand-held power tool device having a drive unit with a drive shaft, at least one rotary percussion mechanism and at least one cooling air unit with at least one fan wheel arranged between the drive unit and the rotary percussion mechanism.

The invention proposes that the fan wheel and the rotary percussion mechanism overlap at least partially in the axial direction.

In this context, "handheld power tool device" is to be understood to mean, in particular, at least one part, in particular a component, of a handheld power tool. The hand-held power tool device may also comprise, in particular, an integral hand-held power tool. The hand-held power tool can be configured as any machine, advantageously as an electric motor, more advantageously as a rotary impact screwdriver. A "drive unit" is to be understood to mean, in particular, a unit which is provided for converting, in particular, electrical energy into kinetic energy, in particular rotational energy. "provided" is to be understood in particular as specifically programmed, designed and/or equipped. In particular, the term "function that the object is provided to determine" is to be understood to mean that the object fulfills and/or implements the determined function in at least one application or operating state. In this context, a "rotary impact mechanism" is to be understood in particular as an impact mechanism which is provided for converting an at least substantially continuous power output of the drive unit into impact-shaped rotary pulses. The rotary impact mechanism can be designed in particular as a cam rotary impact mechanism or as a V-groove rotary impact mechanism.

Here, a "cooling air unit" is to be understood to mean, in particular, a unit having at least one component which is provided for generating a cold air flow, such as, in particular, by means of the generation of a negative pressure by means of which air for cooling is drawn. The cooling air unit has at least one fan wheel arranged for generating a cold air flow. The cooling air unit is provided in particular for cooling the rotary percussion mechanism and/or the drive unit. The cooling air unit is in particular provided to be driven by a drive unit. The fan wheel of the cooling air unit is arranged in particular on the drive shaft of the drive unit. The drive unit is provided in particular for bringing the fan wheel into a rotational movement.

In this context, at least two elements and/or units "overlap" is to be understood in particular to mean that the elements and/or units are arranged at least partially in a plane intersecting mutually overlapping elements and/or units in the assembled state. Preferably, the fan wheel extends at least partially beyond the rotary impact mechanism in the axial direction. The axial direction corresponds in particular at least substantially to the longitudinal extension direction of the drive shaft of the drive unit. The term "longitudinal extension direction" of the object is to be understood in particular to mean a direction which is parallel to the largest lateral edge of the smallest geometrical cuboid which surrounds the object exactly completely. In this context, the fan wheel at least partially "extends beyond" the rotary impact mechanism, in particular at least a part of the fan wheel extending in the axial direction, in particular at least one fan wheel blade, extends beyond at least a part of the rotary impact mechanism. The fan wheel in particular has a plurality of fan wheel blades arranged in the circumferential direction, which overlap at least a part of the rotary impact mechanism in the circumferential direction. In this context, "circumferential direction" is to be understood to mean, in particular, a circular direction, the center point of which is arranged at least substantially at the axial center of the rotary percussion mechanism and/or the fan wheel.

Such a configuration makes it possible to provide a hand-held power tool device of this type with advantageous design features. In particular, a compact design of the rotary percussion mechanism, in particular a small design length, can be achieved by the overlapping arrangement of the fan wheel and the rotary percussion mechanism. The length of the hand-held power tool device is, for example, at most 200mm, in particular at most 160mm, in particular at most 140mm, particularly preferably at most 130mm. The length of the hand-held power tool device comprises, inter alia, the drive unit and the rotary percussion mechanism as well as the tool receiver. Furthermore, an advantageous cooling of the rotary impact mechanism can be achieved.

Furthermore, it is proposed that the rotary percussion mechanism has at least one transmission unit, wherein the fan wheel and the transmission unit at least partially overlap in the axial direction. The transmission is in particular designed as a planetary gear. A "planetary gear set" is to be understood to mean, in particular, a gear set having at least one planetary gear connected to a planetary gear carrier, which planetary gear is coupled radially outward to a ring gear and/or radially inward to a sun gear. The sun gear, the planet gears and/or the ring gear can in particular be formed by circular gears or by non-circular gears which cooperate with one another. A plurality of planetary gear sets can be engaged one after the other and/or a plurality of stages can be added between the planet gears and the ring gear. The fan wheel extends at least partially beyond the gear, in particular in the axial direction. The fan wheel in particular extends beyond at least one transmission element and/or at least one transmission stage of the transmission unit. This makes it possible to achieve an advantageously effective cooling of the transmission unit. In addition, an advantageously compact design of the hand-held power tool device, in particular an advantageously small design length, can be achieved.

Furthermore, it is proposed that the rotary percussion mechanism has at least one percussion mechanism cover which is formed in one piece with the ring gear of the transmission unit, wherein the fan wheel and at least the percussion mechanism cover at least partially overlap in the axial direction. In this context, an "impact mechanism cover" is to be understood to mean, in particular, a cover element which is provided to at least largely enclose the rotary impact mechanism in the direction of the at least one further hand-held power tool unit, in particular in the direction of the drive unit. In this context, "at least to a large extent" is to be understood in particular as meaning at least up to 51%, preferably at least up to 65% and particularly preferably at least up to 75%. The impact mechanism cover has in particular at least one through-opening, which is provided for at least partial passage of at least one shaft, in particular a drive shaft. "toothing" is to be understood to mean, in particular, a transmission gear having a rim (Kranz) which is formed in the shape of a cylindrical housing or in the shape of an interrupted cylindrical housing. The term "one-piece" is to be understood in particular to mean an at least cohesive connection, for example by a welding process, an adhesive process, an injection molding process and/or another process which is considered to be expedient by the person skilled in the art, and/or to mean an advantageous shaping in one part, for example by production from a cast part and/or by production in a single-component or multi-component injection method and advantageously from a single blank. The impact mechanism cover and the ring gear are in particular formed at least substantially from a metallic material, preferably from a metallic sintered material. This makes it possible to achieve an advantageously effective cooling of the striking-mechanism cover and the ring gear connected in one piece to the striking-mechanism cover. Furthermore, a compact design of the hand-held power tool device, in particular a small design length, can be achieved.

It is furthermore proposed that the transmission unit has at least one intermediate shaft, wherein the fan wheel and at least the intermediate shaft overlap at least partially in the axial direction. An "intermediate shaft" is to be understood to mean, in particular, a shaft of a drive train, which is arranged, in particular, between a drive unit and an output shaft of a hand-held power tool. The at least one intermediate shaft is in particular provided for directly and/or indirectly transmitting forces and/or movements, in particular generated by the drive unit, to the driven shaft. The countershaft is at least partially designed as a planet carrier of a gear unit of the hand-held power tool device, which is designed as a planetary gear set. The intermediate shaft is supported, in particular, at least partially inside the impact mechanism cover. In particular, the term "intermediate shaft is supported at least partially inside the impact mechanism cover" is to be understood to mean that the end of the intermediate shaft facing away from the output shaft of the rotary impact mechanism is rotatably supported inside the impact mechanism cover. In this context, "rotatably mounted" is to be understood in particular to mean that the intermediate shaft is provided for carrying out a rotational movement relative to the impact mechanism cover, at least in the operating state. This makes it possible to achieve an advantageous cooling of the intermediate shaft of the transmission unit. In addition, an advantageously compact design of the hand-held power tool device, in particular an advantageously small design length, can be achieved.

Furthermore, it is proposed that the transmission unit has at least one intermediate shaft bearing, wherein the fan wheel and at least the intermediate shaft bearing overlap at least partially in the axial direction. In this context, an "intermediate shaft bearing" is to be understood to mean, in particular, a radial bearing which is provided for rotatably mounting the intermediate shaft. The intermediate shaft bearing is arranged directly on the through-going recess of the impact mechanism cover. The intermediate shaft bearing is arranged in particular on the side of the percussion mechanism cover facing the output shaft of the rotary percussion mechanism. The intermediate shaft bearing can be designed in particular as a sliding bearing or as a rolling bearing. The intermediate shaft bearing can preferably be configured as a rolling bearing, for example as a ball bearing, a roller bearing or a needle bearing. Preferably, the intermediate shaft bearing is arranged at least partially inside the impact mechanism cover of the rotary impact mechanism. The impact mechanism cover has in particular at least one bearing receptacle which is provided for receiving an intermediate shaft bearing. In this context, "bearing receptacle" is to be understood to mean, in particular, a region which is formed at least partially by the striking mechanism cover and which is provided for a positionally fixed arrangement of the intermediate shaft bearing within the striking mechanism cover. The bearing receptacle is in particular formed in one piece with the impact mechanism cover. The bearing receptacle is arranged in particular in the region of the through-recess of the impact mechanism cover. The bearing receptacle is in particular at least partially hollow-cylindrical. The bearing receptacle has an at least substantially annular stop element for the intermediate shaft bearing, in particular at the end facing away from the impact mechanism cover. The stop element is in particular formed integrally with the bearing receptacle. The inner diameter of the bearing receptacle corresponds in particular at least substantially to the outer diameter of the intermediate shaft bearing. Preferably, the bearing is fixed in the bearing receiving portion by press fitting. "press fit" is to be understood to mean, in particular, a force-fitting connection which can be embodied as a transverse and/or longitudinal press fit. A "force-fitting connection" is to be understood here to mean, in particular, a releasable connection, in which the holding force between the two components is preferably transmitted by friction forces between the components. This makes it possible to achieve advantageous cooling of the intermediate shaft bearing. In addition, an advantageously compact design of the hand-held power tool device, in particular an advantageously small design length, can be achieved.

It is also proposed that the drive unit has at least one shell-less electric motor. Preferably, the drive shaft is configured as an armature shaft of a shell-less electric motor. This makes it possible to achieve an advantageously effective cooling of the drive unit. In addition, an advantageously compact design of the hand-held power tool device, in particular an advantageously small design length, can be achieved.

Furthermore, a hand-held power tool, in particular a rotary impact screwdriver, having at least one hand-held power tool device according to the invention is proposed. In this way, a compact hand-held power tool, in particular a compact rotary impact screwdriver, can be provided. The hand-held power tool can have a advantageously small overall length.

The handheld power tool device according to the invention is not intended to be limited to the above-described applications and embodiments. The hand-held power tool device according to the invention for fulfilling the operating principle described herein may in particular have a different number of individual elements, components and units than the number mentioned here.

Drawings

Other advantages are derived from the following description of the figures. Three embodiments of the invention are shown in the drawings. The figures, description and claims contain several features in combination. The person skilled in the art is also well aware of the features individually and summarised in other combinations of significance.

The figures show:

fig. 1 is a schematic, partially sectional illustration of a hand-held power tool embodied as a rotary impact screwdriver,

fig. 2 is a sectional view of a hand-held power tool device of the hand-held power tool with a drive unit and a rotary percussion mechanism,

figure 3 is a perspective view of the intermediate shaft of the hand-held power tool device of figure 2,

figure 4a cross-sectional view of the intermediate shaft of figure 3,

figure 5 is a schematic illustration of machining the planetary gear receptacle into the countershaft,

figure 6 is a front view of the hand-held power tool,

figure 7 is a sectional view of the hand-held power tool,

fig. 8 is a sectional view of an alternative hand-held power tool device, an

Fig. 9 is a sectional view of a further alternative hand-held power tool device.

Detailed Description

Fig. 1 shows a hand-held power tool 34a, which is designed as a rotary percussion screwdriver, in a schematic partial sectional view. The hand-held power tool 34a is designed as a battery-powered rotary impact screwdriver. The hand-held power tool 34a comprises a handle 80 which is perpendicular to a rotational axis 84a of the hand-held power tool 34a and is provided for receiving a tool receiver 86a of an insertion tool (not shown here). The handle 80a comprises a battery receptacle 90a on a side 88a facing away from the hand-held power tool 34a. The battery receptacle 90a is provided as a battery unit 92a for receiving an energy supply for the hand-held power tool 34a.

Furthermore, the hand-held power tool 34a has a hand-held power tool device 10a with a drive unit 12a and a rotary percussion mechanism 16a. Fig. 2 shows the hand-held power tool device 10 in a sectional view. The hand-held power tool device 10a has a drive housing 72a and an impact mechanism housing 74a (see fig. 1). The drive housing 72a at least substantially completely encloses the drive unit 12a. The impact mechanism housing 74a at least substantially completely encloses the rotary impact mechanism 16a (see fig. 1). The drive unit 12a is designed as an electric drive unit which is supplied with electrical energy by means of the accumulator unit 92a. The drive unit 12a has a shellless electric motor 26a, which is provided to convert the electrical energy provided by the accumulator unit 92a into rotational energy. The electric motor 26a is configured as an open motor, in which the components of the electric motor 26a are supported separately in the drive housing 72 a. Furthermore, the drive unit 12a has a drive shaft 14a, which is provided for transmitting rotational energy to the rotary percussion mechanism 16a. The drive shaft 14a is formed entirely by the armature shaft 28a of the shell-less motor 26 a. Armature shaft 28a is embodied in one piece. The rotary impact mechanism 16a is configured as a V-groove type rotary impact mechanism. The rotary impact mechanism 16a is provided for converting the continuous power output of the drive unit 12a into impact-shaped rotary pulses. The power of the drive unit 12a is transmitted to the insertion tool by the hammer 96a of the rotary impact mechanism 16a producing an impact by means of pulses of high power intensity onto the corresponding anvil 100a of the output spindle 15 a. In the embodiment shown, the anvil 100a is formed integrally with the output spindle 15a and the tool receiver 86 a. The striker 96a is supported such that axial and radial movement is possible. The control of the axial movement is by the V-groove 98a (see fig. 3) and the follower ball 97a (see fig. 1). The spring 138a is responsible for the reset movement of the impactor 96 a.

The rotary impact mechanism 16a has an intermediate shaft 18a, which is oriented at least substantially in alignment with the drive shaft 14a. Furthermore, the hand-held power tool device 10a has at least one bearing 20a for mounting the drive shaft 14a. The bearing 20a is arranged at least partially in a plane 22a intersecting the intermediate shaft 18a, which plane runs at least substantially perpendicularly to the intermediate shaft 18a. The drive shaft 14a is supported at least partially inside the intermediate shaft 18a. The intermediate shaft 18a has a receiving recess 24a arranged for at least partially receiving the drive shaft 14a. The receiving groove 24a extends at least substantially along the rotational axis 108a of the intermediate shaft 18a. In the assembled state, the drive shaft 14a projects at least partially into the intermediate shaft 18a, in particular into a receiving recess 24a of the intermediate shaft 18a. A bearing 20a for supporting the drive shaft 14a is disposed inside the receiving groove 24 a. The bearing 20a for supporting the drive shaft 14a is configured as a rolling bearing. Furthermore, the intermediate shaft 18a has a sealing element receptacle 30a. The sealing element receptacle 30a is arranged directly on an insertion opening 136a of the receiving recess 24a of the intermediate shaft 18a, which is provided for inserting the drive shaft 14a into the intermediate shaft 18a. Furthermore, the intermediate shaft 18a has at least one sealing element 32a arranged in the sealing element receptacle 30a. The sealing element 32a is designed as a shaft sealing ring, in particular as a radial shaft sealing ring, which is arranged between the drive shaft 14a and the intermediate shaft 18a in the assembled state. The sealing element receptacle 30a is configured as a shaft sealing ring receptacle. A further bearing 102a for mounting the drive shaft 14a is arranged on a side 104a of the electric motor 26a in the drive housing 72a facing away from the tool receptacle 86 a.

Furthermore, the hand-held power tool device 10a has a cooling air unit 36a, which comprises at least one fan wheel 38a arranged between the drive unit 12a and the rotary percussion mechanism 16a. The fan wheel 38a is provided in particular for generating a cooling air flow for cooling the rotary impingement mechanism 16a and/or the drive unit 12a. The fan wheel 38a is arranged on the drive shaft 14a of the drive unit 12a in a rotationally fixed manner. The drive unit 12a is provided for putting the fan wheel 38a into rotational motion during operation of the hand-held power tool 34a. The fan wheel 38a and the rotary impact mechanism 16a overlap at least partially in the axial direction 40 a. Preferably, fan wheel 38a extends at least partially beyond rotary impact mechanism 16a in axial direction 40 a. The fan wheel 38a has a plurality of fan wheel blades 110a arranged in the circumferential direction, which overlap at least a part of the rotary percussion mechanism 16a in the circumferential direction. The fan impeller blades 110a extend at least substantially in the axial direction 40 a. The rotary impact mechanism 16a has at least one gear unit 42a in the form of a single-stage planetary gear 50 a. A bearing 20a for mounting the drive shaft 14a is arranged on the side of the planetary gear 50a facing away from the drive unit 12a. The meshing section 144a between the drive shaft 14a and the planetary gear transmission 50a is arranged between the bearing 20a and the bearing 102 a. Alternatively, the gear unit 42a may be designed as a multi-stage planetary gear. Preferably, the fan wheel 38a and at least the transmission unit 42a at least partially overlap in the axial direction 40 a. The planetary gear 50a includes at least one ring gear 46a. Further, the rotary impact mechanism 16a includes an impact mechanism cover 44a. The impact mechanism cover 44a is disposed between the drive unit 12a and the planetary gear transmission 50 a. The striking-mechanism cover 44a is provided in particular for closing the rotary striking mechanism 16a at least to a large extent in the direction of the drive unit 12a. The impact mechanism cover 44a has a through-going recess 106a, which is provided for at least partially passing through the drive shaft 14a. The impact mechanism cover 44a is formed in one piece with the toothed ring 46a. The impact mechanism cover 44a and the ring gear 46a consist at least substantially of a metallic material, in particular a metallic sintered material. Preferably, fan wheel 38a and at least impact mechanism cover 44a at least partially overlap in axial direction 40 a.

The hand-held power tool device 10 also has an intermediate shaft bearing 48a for supporting the intermediate shaft 18a. The intermediate shaft bearing 48a is configured as a rolling bearing. Alternatively, the intermediate shaft bearing 48a may be configured as a plain bearing. The intermediate shaft bearing 48a is designed as a radial bearing, which is provided for rotatably mounting the intermediate shaft 18a in the impact mechanism cover 44a. The intermediate shaft bearing 48a is arranged at least partially inside the impact mechanism cover 44a of the rotary impact mechanism 16a. The intermediate shaft bearing 48a is arranged directly on the through-recess 106a of the impact mechanism cover 44a. The intermediate shaft bearing 48a is arranged on the side of the impact mechanism cover 44a facing the tool receiving portion 86 a. The impact mechanism cover 44a has at least one bearing receiving portion 52a configured to receive the intermediate shaft bearing 48a. The bearing receptacle 52a is formed integrally with the impact mechanism cover 44a. The bearing receptacle 52a is arranged in the region of the through-recess 106a of the impact mechanism cover 44a. The bearing receptacle 52a is at least substantially hollow-cylindrical in configuration. The bearing receptacle 52a has an at least substantially annular stop element 112a for the intermediate shaft bearing 48a on the end facing away from the impact mechanism cover 44a. The stop element 112a is formed in one piece with the bearing receptacle 52 a. The inner diameter of the bearing receptacle 52a corresponds at least substantially to the outer diameter of the intermediate shaft bearing 48a. Preferably, the intermediate shaft bearing 48a is fixed in the bearing receiving portion 52a by press-fitting. Preferably, fan wheel 38a and at least countershaft bearing 48a and/or countershaft 18a at least partially overlap in axial direction 40 a.

Fig. 3 shows the intermediate shaft 18a in a perspective view. Fig. 4 shows the intermediate shaft 18a in a sectional view along the sectional plane III-III. The intermediate shaft 18a is designed as a planet carrier 94a of the planetary gear 50 a. The intermediate shaft 18a has a plurality of

planetary gear receptacles

54a, 56a, 58a and planetary

gear bearing points

60a, 62a, 64a arranged in the circumferential direction. In each

planetary gear receptacle

54a, 56a, 58a, a planetary gear 130a is arranged, which is rotatably mounted by means of a pin 132 a. The intermediate shaft 18a has at least one

material recess

66a, 68a, 70a on its outer circumference, at least in the region of at least one planetary gear bearing. The number of

material openings

66a, 68a, 70a corresponds to the number of

planet gear receptacles

54a, 56a, 58a. Each

planet carrier

54a, 56a, 58a has exactly one

material recess

66a, 68a, 70a associated therewith. The countershaft 18a has three

planetary gear receptacles

54a, 56a, 58a with in each case one planetary gear bearing 60a, 62a, 64a. The planet

gear bearing points

60a, 62a, 64a are each arranged on the countershaft 18a at least substantially offset by 120 ° in the circumferential direction from one another. The

planet gear receptacles

54a, 56a, 58a are separated from one another by webs 124a which extend radially with respect to the longitudinal extension direction 122a of the intermediate shaft 18a. Viewed in the longitudinal extension direction 122a of the intermediate shaft 18a, the

planetary gear receptacles

54a, 56a, 58a are delimited by two disk-shaped

wall elements

126a, 128a, which are arranged at least substantially perpendicularly to the longitudinal extension direction 122 a. The

wall elements

126a, 128a are at least substantially circular in shape. The

wall elements

126a, 128a are formed in one piece with the intermediate shaft 18a. The

material openings

66a, 68a, 70a are at least substantially of circular segment shape. The

planet gear receptacles

54a, 56a, 58a are at least substantially cylindrical in shape

And (5) constructing. The material recesses 66a, 68a, 70a are machined into one of the

wall elements

126a, 128 a. The material recesses 66a, 68a, 70a are machined into the wall elementsIn the part 126a, the wall element is arranged in the assembled state of the intermediate shaft 18a in the direction of the drive unit 12a. The

wall elements

126a, 128a have at least substantially the same radius. Alternatively, one of the

wall elements

126a, 128a may have a smaller radius.

The material recesses 66a, 68a, 70a are provided for temporarily receiving the milling head spindle 78a (see fig. 5) at least in part during the production of the intermediate shaft 18a. The

planet gear receptacles

54a, 56a, 58a are machined into the blank of the intermediate shaft 18a by means of a disk cutter 134a. During the machining of the

planetary gear receptacles

54a, 56a, 58a, the head spindle 78a of the disc cutter 134a is introduced at least partially into the material recesses 66a, 68a, 70a. Preferably, the

planet gear receptacles

54a, 56a, 58a are machined at least substantially simultaneously into the countershaft 18a in the same method step, in particular by means of a plurality of identical disc cutters 134a. The disc cutter 134a is guided onto the intermediate shaft 18a in such a way that the milling head spindle 78a runs at any time at least substantially parallel to the longitudinal extension direction 122a of the intermediate shaft 18a.

Fig. 6 shows a front view of the hand-held power tool 34a. Fig. 7 shows a sectional view of hand-held power tool 34a along sectional line VI-VI. The ring gear 46a of the planetary gear set 50a is clamped between the drive housing 72a and the impact mechanism housing 74 a. The drive housing 72a and the impact mechanism housing 74a have clamping surfaces 114a which, in the assembled state, bear against at least one surface 116a of the ring gear 46a from opposite sides and which each exert a clamping force on the ring gear 46a. The ring gear 46a is fastened to the drive housing 72a by means of at least one bolt element 76a, preferably by means of at least one bolt. Ring gear 46a is illustratively secured by four bolt members 76 a. Ring gear 46a has a recess 118a on the outer periphery, which is provided for the passage of bolt element 76 a. The drive housing 72a has a number of thread grooves 120a corresponding to the number of bolt elements 76a, which have threads corresponding to the threads of the bolt elements 76 a. The drive housing 72a, the impact mechanism housing 74a and the ring gear 46a are connected to one another in the assembled state by means of the screw elements 76a, wherein the ring gear 46a is arranged between the drive housing 72a and the impact mechanism housing 74 a. Alternatively or additionally, the ring gear 46a may be fixed to the impact mechanism housing 74a by means of at least one bolt element 76 a.

Another embodiment of the present invention is shown in fig. 8 and 9. The following description and the figures are essentially limited to the differences between the exemplary embodiments, wherein reference may in principle also be made to further exemplary embodiments, in particular to the figures and/or illustrations of fig. 1 to 7, with regard to components having the same designation, in particular with regard to components having the same reference numerals. To distinguish the embodiments, the letter a is placed after the reference numerals of the embodiments in fig. 1 to 7. In the embodiment of fig. 1 to 7, the letter a is replaced by letters b to c.

Fig. 8 shows an alternative configuration of the hand-held power tool device 10b in a sectional view. The hand-held power tool device 10b has a drive unit 12b and a rotary percussion mechanism 16b with a planetary gear 50 b. The drive unit 12b has a shell-less electric motor 26b, which is provided for converting electrical energy into rotational energy. The motor 26b is configured as an open motor. Furthermore, the drive unit 12b has a drive shaft 14b, which is provided for transmitting rotational energy to the rotary impact mechanism 16b. The drive shaft 14b is formed in part by an armature shaft 28b of a shell-less motor 26 b.

The rotary impact mechanism 16b has an intermediate shaft 18b, which is oriented at least substantially in alignment with the drive shaft 14b. Furthermore, the hand-held power tool device 10b has at least one bearing 20b for mounting the drive shaft 14b. The drive shaft 14b is supported at least partially inside the intermediate shaft 18 b. The intermediate shaft 18b has a receiving recess 24b arranged for at least partially receiving the drive shaft 14b. The bearing 20b is arranged directly on an insertion opening 136b of the receiving recess 24b of the intermediate shaft 18b, which is provided for inserting the drive shaft 14b into the intermediate shaft 18 b. A bearing 20b for supporting the drive shaft 14b is arranged on the side of the planetary gear 50b facing the drive unit 12 b. The bearing 20b is configured as a rolling bearing.

Fig. 9 shows an alternative configuration of a hand-held power tool device 10c in a sectional view. The hand-held power tool device 10c has a drive unit 12c and a rotary percussion mechanism 16c with a planetary gear set 50 c. The drive unit 12c has a shell-less electric motor 26c, which is provided for converting electrical energy into rotational energy. The motor 26c is configured as an open motor. Furthermore, the drive unit 12c has a drive shaft 14b, which is provided for transmitting rotational energy to the rotary impact mechanism 16c. The drive shaft 14c is formed in part by the armature shaft 28c of the shell-less motor 26 c.

The rotary impact mechanism 16c has an intermediate shaft 18c, which is oriented at least substantially in alignment with the drive shaft 14c. Furthermore, the hand-held power tool device 10c has at least one bearing 20c for mounting the drive shaft 14c. The drive shaft 14c is supported at least partially inside the intermediate shaft 18 c. The intermediate shaft 18c has a receiving recess 24c arranged for at least partially receiving the drive shaft 14c. The bearing 20c is arranged directly on an insertion opening 136c of the receiving recess 24c of the intermediate shaft 18c, which is provided for inserting the drive shaft 14c into the intermediate shaft 18 c. A bearing 20c for supporting the drive shaft 14c is arranged on the side of the planetary gear 50c facing the drive unit 12 c. The bearing 20c is configured as a ball bearing. Furthermore, the hand-held power tool device 10c has a sealing ring 140c which surrounds the bearing 20c in the circumferential direction and which is arranged between the bearing 20c and the inner diameter of the receiving groove 24c of the intermediate shaft 18 c. The intermediate shaft 18c has a groove 142c arranged to receive the sealing ring 140c.

Claims

1. A hand-held machine tool device having a drive unit (12a 12b, 12c) with a drive shaft (14a, 1112c), at least one rotary impact mechanism (1694) and at least one cooling air unit (36b) with at least one fan wheel (38a) arranged between the drive unit (12a, 12b and 1111c) and the rotary impact mechanism (1694), characterised in that the fan wheel (38a) and the rotary impact mechanism (1694) are at least partially overlapping in an axial direction (40a, 40b, i.e. the fan wheel (42b) is at least partially arranged in the common plane of the rotary impact mechanism (1695, characterized in that the transmission unit (42a.

2. The hand-held machine tool arrangement according to claim 1, characterized in that the fan wheel (38a, 38b, 38c) extends at least partially in the axial direction (40a, 40b, 40c) beyond the rotational impact mechanism (1694.

3. The hand-held machine tool device according to claim 1, characterized in that the transmission unit (42a, 42b, 42c) has at least one intermediate shaft (18a, 18b, 18c), wherein the fan wheel (38a, 38b) and at least the intermediate shaft (18a, 18b, 18c) overlap at least partially in the axial direction (40a.

4. The hand-held machine tool arrangement according to any one of claims 1 to 3, characterized in that the countershaft bearing (48a, 48b, 48c) is arranged at least partly inside an impact mechanism cover (44a, 44c.

5. The hand-held power tool device according to any one of claims 1 to 3, characterized in that the drive unit (12a.

6. The hand-held power tool device according to claim 5, characterized in that the drive shaft (14a.

7. Hand-held power tool device according to one of claims 1 to 3, characterized in that the length of the hand-held power tool device is at most 200mm.

8. The hand-held machine tool arrangement according to any one of claims 1 to 3, characterized in that the impact mechanism cover (44a 44b 44c) is arranged for closing the rotary impact mechanism (1694.

9. Hand-held power tool device according to one of claims 1 to 3, characterized in that the length of the hand-held power tool device is maximally 160mm.

10. Hand-held power tool device according to one of claims 1 to 3, characterized in that the length of the hand-held power tool device is at most 140mm.

11. Hand-held power tool device according to one of claims 1 to 3, characterized in that the length of the hand-held power tool device is maximally 130mm.

12. The hand-held power tool device according to claim 3, characterized in that the intermediate shaft (18a, 18b) is at least partially configured as a planet carrier (94 a.

13. The hand machine tool arrangement according to claim 4, characterized in that the impact mechanism cover (44a 44b 44c) has at least one bearing receiving portion (52a.

14. The hand-held power tool device as claimed in claim 13, characterized in that the bearing receiving portion (52a.

15. The hand-held machine tool device according to one of claims 1 to 3, characterized in that the fan wheel (38 a) has a plurality of fan wheel blades (110 a) arranged in the circumferential direction, which overlap at least a part of the rotary impact mechanism (1694.

16. Hand-held power tool having at least one hand-held power tool device (10 a, 10b, 10 c) according to one of the preceding claims.