Hand-held power tool having tool receptacle

Abstract

The invention relates to a hand-held power tool (100) having a tool receptacle (150) and a housing in which a drive motor and a transmission (118) are arranged, the transmission (118) being arranged in a transmission housing (119), the tool receptacle (150) having a receptacle sleeve (209), the receptacle sleeve (209) being arranged in the transmission housing (119). The gear housing (119) has a receiving sleeve (231, 232) which is rotatably mounted in the gear housing (119) by means of at least one bearing element (231, 232) and for receiving a plug-in tool (140), and the gear housing (119) has a receiving portion (296) with an annular flange (298) for receiving the at least one bearing element (231, 232), a fixing element (280) is provided for fixing the at least one bearing element (231, 232) on the receiving portion (296), and a fastening element (280) for fastening the at least one bearing element (231, 232) in the receptacle (296), the fastening element (280) being fastened to the annular flange (298) and closing the receptacle (296) at least in some regions on an end face (293) of the transmission housing (119).

Description

Technical Field

[0001] The present invention relates to a handheld machine tool having a tool receptacle and a housing, in which a drive motor and a transmission are arranged, wherein the transmission is arranged in the transmission housing, wherein the tool receptacle has a receiving sleeve, which is rotatably supported in the transmission housing via at least one bearing element and is configured to receive an inserted tool, and the transmission housing includes a receiving portion having an annular flange for receiving at least one bearing element. Background Art

[0002] Such a handheld power tool having a transmission arranged in a transmission housing is known from the prior art. The tool holder of the handheld power tool has a receiving sleeve which is rotatably supported in the transmission housing via at least one bearing element. The transmission housing comprises a receiving portion having an annular flange for receiving at least one bearing element. Summary of the invention

[0003] The invention relates to a handheld power tool having a tool receptacle and a housing, in which a drive motor and a transmission are arranged, wherein the transmission is arranged in the transmission housing, wherein the tool receptacle has a receiving sleeve which is rotatably supported in the transmission housing via at least one bearing element and is designed for receiving an inserted tool, and the transmission housing comprises a receptacle having an annular flange for receiving at least one bearing element. A fixing element is provided for fixing the at least one bearing element in the receptacle, wherein the fixing element is fastened to the annular flange and closes the receptacle at least in regions on the end side of the transmission housing.

[0004] The present invention therefore makes it possible to provide a handheld power tool having a tool receptacle in which a stable and robust fixation of at least one bearing element can be achieved by means of a fixing element.

[0005] The fastening element is preferably designed as a cup with a sleeve-shaped base body, on which an annular collar for support on the transmission housing and an annular base for at least regionally closing the receptacle are formed.

[0006] Thus, a suitable fixation of the at least one bearing element in the receptacle can be achieved in a simple manner.

[0007] A gear cover is preferably arranged on the outer circumference of the gear housing, which gear cover forms a receptacle for an annular collar facing the fastening element, wherein a spring or damping element is arranged in the receptacle for prestressing the fastening element against the gear housing.

[0008] A safe and secure arrangement of the fastening element on the transmission housing can thus be achieved.

[0009] According to one embodiment, at least one bearing element has an associated bearing width in the longitudinal direction of the receiving sleeve, wherein the annular base of the fastening element has a wall thickness which is less than one quarter and preferably less than one fifth of the bearing width.

[0010] Thus, a suitable fixing element can be provided in a simple manner.

[0011] Preferably, the annular bottom surface has a wall thickness of less than 2.2 mm.

[0012] Thus, a compact and stable fixing element may be provided.

[0013] Preferably, the fastening element, in particular the sleeve-shaped base body, is fastened to the outer circumference of the annular collar of the receptacle by means of a press fit or snap fit.

[0014] In this way, a robust and stable arrangement of the fastening element on the transmission housing can be ensured.

[0015] According to one embodiment, the fastening element is formed integrally with a transmission cover arranged on the outer circumference of the transmission housing.

[0016] Thus, a simple and compact fixing element may be provided.

[0017] Preferably, the end face of the gear cover forms the fastening element, wherein the end face has a disk-shaped fastening section.

[0018] The fixing element can thus be configured in a simple manner.

[0019] Preferably, the annular disk-shaped bottom surface and the annular disk-shaped fastening section each have a through-hole, and the diameter of the through-hole is smaller than the outer diameter of the at least one bearing element.

[0020] Fixing of the at least one bearing element in the axial direction can thus be achieved easily and uncomplicatedly.

[0021] The fastening element or the gear cover preferably comprises plastic, sheet metal and / or aluminum.

[0022] Thus, an uncomplicated and cost-effective fastening element or transmission cover can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The invention is explained in more detail in the following description based on the exemplary embodiments shown in the accompanying drawings. The accompanying drawings show:

[0024] Figure 1: A schematic diagram of a handheld power tool having a transmission device arranged in a transmission device housing;

[0025] Figure 2 :have Figure 1 A longitudinal section of the transmission device, the support device of the tool receiving portion and the transmission device housing of the fixing element;

[0026] Figure 3 : Figure 2 An enlarged detail of a longitudinal section of a support device and a fixing element of a tool receiving portion;

[0027] Figure 4 : Figure 2 and Figure 3 An exploded view of a transmission housing with a fixing element and a housing cover;

[0028] Figure 5 : Figures 2 to 4 A three-dimensional view of a fixing element;

[0029] Figure 6 : Figures 2 to 4 A three-dimensional view of a transmission cover;

[0030] Figure 7 :have Figure 1 A longitudinal section through a transmission housing of a transmission, a support device for a tool receptacle and an alternative fastening element.

[0031] In the figures, functionally identical or similar elements are provided with the same reference numerals and are described in detail only once. DETAILED DESCRIPTION

[0032] Figure 1 A handheld power tool 100 is shown which is provided with a tool receptacle 150 and has a housing 110 with a handle 126. According to one specific embodiment, the handheld power tool 100 can be mechanically and electrically connected to a battery pack 130 for a mains-independent power supply.

[0033] An electric drive motor 114 and a transmission 118 powered by a battery pack 130 are arranged in the housing 110 as shown. The drive motor 114 can be actuated, i.e. switched on and off, for example, by a manual switch 128 and can be any type of motor, such as an electronically commutated motor or a DC motor. The drive motor 114 is preferably electronically controllable or adjustable, so that both reverse operation and a desired speed can be achieved. The mode of operation and the structure of suitable drive motors are sufficiently known from the prior art that a detailed description thereof is omitted here for the sake of brevity.

[0034] The drive motor 114 is connected to a transmission 118 via an associated motor shaft 116, which converts the rotation of the motor shaft 116 into the rotation of the output shaft 124. The conversion is preferably performed in such a way that the output shaft 124 rotates with an increased torque but a reduced speed relative to the motor shaft 116. The drive motor 114 is illustrated in a motor housing 115. The transmission 118 is arranged in a transmission housing 119. The transmission housing 119 and the motor housing 115 are arranged in a housing 110, for example.

[0035] According to one embodiment, a mechanical impact mechanism 122 is provided. The drive motor 114 is connected to the transmission 118 via the motor shaft 116, so that the rotation of the motor shaft 116 is converted into the rotation of the intermediate shaft 120 arranged between the transmission 118 and the impact mechanism 122. The mechanical impact mechanism 122 and / or the transmission 118 are arranged in a common transmission housing 119. Alternatively, the mechanical impact mechanism 122 can also be arranged in a separate impact mechanism housing.

[0036] The mechanical impact mechanism 122 connected to the intermediate shaft 120 is, for example, a rotary or rotating impact mechanism, which generates a high-intensity impact-shaped rotation pulse and transmits it to an output shaft 124, for example, an output spindle. The mechanical impact mechanism is referred to as "mechanical rotary impact mechanism 122" below. In particular, the mechanical rotary impact mechanism 122 is configured to drive the tool receiving part 150 in an impact manner. The mechanical rotary impact mechanism 122 has a spring-loaded impact body ( Figure 2 205 ), which is coupled to the intermediate shaft 120 and is supported on the intermediate shaft 120 so as to be movably supported in the axial direction 102 of the transmission 118 .

[0037] A tool receiving portion 150 is provided on the output shaft 124, which is preferably designed to receive an inserted tool and is preferably connectable to an inserted tool 140 having an outer polygonal coupler. The inserted tool 140 is designed, for example, as a screwdriver bit having an outer polygonal coupler, illustratively an octagonal coupler. Such screwdriver bits are sufficiently known from the prior art that a detailed description thereof is omitted here for the sake of a brief description. In addition, a locking unit 190 is provided for locking and unlocking the inserted tool 140, which is illustratively arranged in the tool receiving portion 150.

[0038] Figure 2 Shown arranged in Figure 1 The transmission 118 in the transmission housing 119 and Figure 1The mechanical rotary impact mechanism 122 and the intermediate shaft 120. As shown in the figure, the optional mechanical rotary impact mechanism 122 has a spring-loaded impact body 205 and an anvil 220 that can be loaded by the impact body 205. The anvil 220 is preferably assigned to the tool receiving part 150, especially to the receiving sleeve 299 of the tool receiving part 150. The anvil 220 is preferably constructed in one piece with the receiving sleeve 209. Here, the anvil 220 is illustrated as being constructed transversely to, especially substantially perpendicular to, the receiving sleeve 209.

[0039] The mechanical rotary impact mechanism 122 generates a high-intensity impact-shaped rotary pulse and transmits the rotary pulse to the output shaft 124 or to the receiving sleeve 209 of the tool receiving part 150 through the anvil 220. The spring-loaded impact body 210 is driven along the transmission device 118. Figure 1 The axial direction 102 of the device is movably supported. Such a mechanical rotary impact mechanism 122 is sufficiently known from the prior art that a detailed description thereof is omitted here for the sake of brevity.

[0040] Preferably, the receiving sleeve 209 is designed for receiving an inserted tool 140. The receiving sleeve 209 is preferably supported radially in a rotationally movable and axially displaceable manner in bearing elements 231, 232 fixed in the transmission housing 119. As shown, the transmission housing 119 has two sections 292, 294 connected to each other. The section 294 is preferably designed as a cover fastened to the section 292.

[0041] also, Figure 2 An inserted tool 140 is shown, which is designed as a bit tool in the diagram and is locked in a tool receptacle 150 or a receiving sleeve 209. The inserted tool 140 can be unlocked by a preferably axial movement of an actuating sleeve 250 of a locking unit (not further indicated).

[0042] As shown, the tool receiving portion 150 has a longitudinal extension 203. It should be noted that in the context of the present invention, the term "axial" is understood as a direction along the longitudinal extension 203 of the tool receiving portion 150. In addition, the term "radial" is understood as a direction approximately perpendicular to the longitudinal extension 203 of the tool receiving portion 150. Therefore, the radial direction 202 is approximately perpendicular to the longitudinal extension 203 of the transmission device 118. Figure 1 The axial direction 102 is arranged along the longitudinal extension 203 of the tool receiving part 150 . Furthermore, the axial direction 102 is arranged substantially parallel to the longitudinal extension 203 of the tool receiving part 150 or parallel to the rotation axis 201 of the tool receiving part 150 .

[0043] Preferably, the transmission housing 119, in particular the section 292, comprises a receptacle 296 with an annular flange 298 for receiving at least one bearing element 231, 232. Preferably, the transmission housing 119, in particular the section 292, forms the receptacle 296. Here, at least one bearing element 231, 232 is preferably arranged radially between the transmission housing 119 and the receiving sleeve 209. As shown, two bearing elements 231, 232 are arranged in the receptacle 296 of the transmission housing 119. The two bearing elements 231, 232 shown are in axial contact, i.e., in contact with each other, along the rotation axis 201 of the tool receptacle 150. According to one embodiment, the bearing elements 231, 232 are configured as rolling bearings, in particular ball bearings.

[0044] Preferably, a damping ring 270 is provided, which is preferably arranged in the transmission housing 119 and serves to damp the impact energy transmitted to the transmission housing 119 via the impact body 205. Here, the damping ring 270 is arranged axially between the anvil 220 and the bearing elements 231, 232, facing the impact body 205 and preferably at least in some areas.

[0045] According to the invention, a fixing element 280 is provided for axially fixing at least one bearing element 231, 232 in the receiving portion 296. Here, the fixing element 280 is fastened to the annular flange 298 and preferably at a position away from the transmission housing 119. Figure 1 The receptacle 296 is at least partially closed on the end side 293 of the handheld power tool 100 that is facing the same. The end side 293 is preferably arranged facing the actuation sleeve 250 .

[0046] According to one embodiment, fastening element 280 is designed as a pot having a sleeve-shaped base body 281. An annular collar 282 for support on transmission housing 119 and an annular bottom surface 283 for at least regionally closing receptacle 296 are preferably formed on sleeve-shaped base body 281.

[0047] Preferably, a transmission cover 240 is arranged on the outer circumference 291 of the transmission housing 119. Here, the inner side 241 of the transmission cover 240 facing the transmission housing 119 or the section 292 is arranged on the outer circumference 291 of the transmission housing 119 or the section 292. The end face 249 of the transmission cover 240 and the annular bottom surface 283 preferably coincide in the axial direction 203, forming a common surface.

[0048] Preferably, the gear cover 240 forms a receptacle 242 facing the annular flange 282 of the fastening element 280. Preferably, a spring or damping element 244 is arranged in the receptacle 242 for prestressing the fastening element 280 on the gear housing 119. Preferably, the annular flange 282 is arranged axially between the section 292 of the gear housing 119 and the spring or damping element 244. Furthermore, preferably, the outer circumference 299 of the sleeve-shaped base body 281 of the fastening element 280 is arranged on the inner side 241 of the gear cover 240. In particular, the sleeve-shaped base body 281 is preferably arranged radially between the gear cover 240 and the annular flange 298 of the receptacle 296. Preferably, the fastening element 280, in particular the sleeve-shaped base body 281, is fixed to the outer circumference 297 of the annular flange 298 of the receptacle 296 by a press fit or an engagement fit.

[0049] Preferably, the fixing element 280 or the gear cover 240 comprises plastic, sheet metal and / or aluminum. In an embodiment in which the fixing element 280 is made of sheet metal, the fixing element 280 can simultaneously serve as a cooling element. Here, according to one embodiment, the fixing element 280 can be configured as a deep-drawn part.

[0050] Preferably, the annular bottom surface 283 has a through hole 288 with a diameter 289. The diameter 289 is preferably smaller than the outer diameter 262 of at least one bearing element 231, 232. Furthermore, the diameter 289 of the through hole 288 is preferably greater than or equal to the inner diameter 261 of at least one bearing element 231, 232.

[0051] As shown, the radial projection 284 of the transmission housing 119 forms an axial support for at least one bearing element 231, 232 which can be arranged in the receiving portion 296, thereby preventing at least one bearing element 231, 232 from moving in the axial direction 102 of the transmission 118 toward the drive motor 114 or, as shown, to the left. For this purpose, the projection 284 partially closes the receiving portion 296 on its radial outer area. According to one embodiment, the projection 284 forms an anti-twist structure of the buffer ring 270 together with the corresponding groove 276 of the buffer ring 270.

[0052] Preferably, the damping ring 270 has an inner diameter 265. Preferably, the inner diameter 265 is smaller than the outer diameter 262 of the bearing elements 231, 232. Furthermore, the inner diameter 265 of the damping ring 270 is preferably greater than or equal to the inner diameter 261 of the bearing elements 231, 232. Therefore, the damping ring 270 can also axially support the bearing element 231 in the region of its inner diameter 265.

[0053] Preferably, the two bearing elements 231, 232 shown are axially arranged between the protrusion 284 and / or the buffer ring 270 and the annular bottom surface 283 of the fixing element 280. As a result, the forces acting on the bearing elements 231, 232 are introduced into Figure 1 The handheld power tool 100 or the optional rotary impact mechanism 122 may also be configured without the damping ring 270 .

[0054] Figure 3 The fixing element 280 is shown arranged in Figure 2 On section 292 of the transmission housing 119. Figure 3 The wall thickness 310 of the annular bottom surface 283 of the fixing element 280 is shown schematically. The wall thickness 310 is preferably less than 2.2 mm, advantageously less than 1 mm.

[0055] Furthermore, at least one bearing element 231, 232 has an associated bearing width 320 in the longitudinal direction of the receiving sleeve 209 or in the axial direction 203. The wall thickness 310 is preferably less than one quarter of the bearing width 320. Particularly preferably, the wall thickness 310 is less than one fifth of the bearing width 320.

[0056] According to the illustrated embodiment with two bearing elements 231, 232, each bearing element 231, 232 has a single bearing width 330, 340. Here, the bearing width 320 is composed of two single bearing widths 330, 340. It should be noted that more than two bearing elements 231, 232 can also be provided.

[0057] Figure 4 Show Figure 2 and Figure 3 An exploded view of the transmission housing 119, a receiving portion 296 with an annular flange 298 for receiving bearing elements 231, 232, a fixing element 280, a spring or damping element 244 for pre-tensioning the fixing element 280 on the transmission housing 119, and a transmission cover 240 is used to intuitively illustrate an exemplary assembly.

[0058] Figure 5 Show Figures 2 to 4 Here, Figure 5 Visually show the support Figures 2 to 4 The transmission housing 119 has a sleeve-shaped base body 281 of an annular collar 282 and an annular bottom surface 283 for at least partially closing a receptacle 296 of the transmission housing 119 .

[0059] Figure 6 Show Figures 2 to 4The transmission cover 240 of the transmission housing 119. Figure 6 The receiving portion 242 formed on the inner side 241 of the transmission cover 240 is intuitively shown for receiving Figures 2 to 4 A spring or damping element 244 is provided.

[0060] Figure 7 An alternative fixing element 780 is shown arranged in Figures 2 to 4 The fastening element 780 is preferably formed integrally with the transmission cover 240 arranged on the outer circumference 291 of the transmission housing 119. In this case, the fastening element 780 is formed as shown on the end face 249 of the transmission cover 240. In this case, the end face 249 has a ring-shaped fastening section 710. Figures 2 to 5 Similar to the fixing element 280 , the fixing portion 710 has a wall thickness 720 , which preferably has at least 2.4 mm.

[0061] The annular fastening section 710 preferably has a through hole 740 . The diameter 730 of the through hole 740 is preferably smaller than the outer diameter 262 of the bearing elements 231 , 232 . Furthermore, the diameter 730 of the through hole 740 is greater than or equal to the inner diameter 261 of the bearing elements 231 , 232 .

[0062] According to Figure 7 The implementation shown in Figures 2 to 4 The spring or damping element 244 is formed so that the inner side 241 of the transmission cover 240 rests against the outer circumference 291 of the transmission housing 119 or the section 292 .

Claims

1. A handheld power tool (100) comprising a tool receptacle (150) and a housing (110), in which a drive motor (114) and a transmission (118) are arranged, wherein: The transmission (118) is arranged in a transmission housing (119), wherein the tool receiving part (150) has a receiving sleeve (209), which is rotatably supported in the transmission housing (119) via at least one bearing element (231, 232) and is used to receive an inserted tool (140), and the transmission housing (119) includes a receiving part (296) with an annular flange (298) for receiving the at least one bearing element (231, 232), characterized in that a fixing element (280) is provided for fixing the at least one bearing element (231, 232) in the receiving part (296), wherein the fixing element (280; 780) is fastened to the annular flange (298) and at least partially closes the receiving part (296) on the end side (293) of the transmission housing (119).

2. The handheld power tool according to claim 1, characterized in that The fastening element (280) is designed as a pot-shaped part with a sleeve-shaped base body (281), on which an annular collar (282) for support on the transmission housing (119) and an annular bottom surface (283) for at least regionally closing the receptacle (296) are formed.

3. The handheld power tool according to claim 2, characterized in that A transmission cover (240) is arranged on the outer circumference (291) of the transmission housing (119), the transmission cover forming a receiving portion (242) of an annular flange (282) facing the fixing element (280), wherein a spring or damping element (244) is arranged in the receiving portion (242) for pre-tensioning the fixing element (280) on the transmission housing (119).

4. The handheld power tool according to claim 2 or 3, characterized in that: The at least one bearing element (231, 232) has an associated bearing width (320) in the longitudinal direction of the receiving sleeve (209), wherein the annular bottom surface (283) of the fixing element (280) has a wall thickness (310) that is less than one quarter of the bearing width (320) and preferably less than one fifth of the bearing width (320).

5. The handheld power tool according to any one of claims 2 to 4, characterized in that The annular base surface (283) of the fixing element (280) has a wall thickness (310) which is less than 2.2 mm.

6. The handheld power tool according to any one of claims 2 to 5, characterized in that The fastening element (280), in particular a sleeve-shaped base body (281), is fastened to the outer circumference (297) of the annular collar (298) of the receptacle (296) by means of a press fit or an engagement fit.

7. The handheld power tool according to claim 1, characterized in that: The fastening element (780) is formed integrally with a transmission cover (240) arranged on an outer circumference (291) of the transmission housing (119).

8. The handheld power tool according to claim 7, characterized in that The end face (249) of the gear cover (240) forms the fastening element (780), wherein the end face (249) has a disk-shaped fastening section (710).

9. The handheld power tool according to any one of claims 2 to 8, characterized in that The annular bottom surface (283) and the annular fixing section (710) each have a through hole (288, 740), and the diameter (289, 730) of the through hole (288, 740) is smaller than the outer diameter (262) of the at least one bearing element (231, 232).

10. The handheld power tool according to any one of claims 2 to 9, characterized in that The fastening element (280) or the gear cover (240) comprises plastic, sheet metal and / or aluminum.

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