Hand-held power tool with planetary gear transmission

Abstract

The invention relates to a hand-held power tool (100) having a drive unit for driving a tool receptacle (140), wherein the drive unit is provided with a planetary gear (120) arranged in a transmission housing (205), the planetary gear having at least one hollow wheel (210), and with an intermediate shaft (220), the intermediate shaft (220) being connected to a planet carrier (223) of the planetary gear (120), the at least one hollow wheel (210) being provided with a fixing element (212) configured for fixing the at least one hollow wheel (210) in the transmission housing (205) along a longitudinal direction (297) of a rotation axis (296) thereof, wherein the fixing element (212) is arranged on the hollow wheel (210) and / or on the intermediate shaft (220).

Description

TECHNICAL FIELD

[0001] The invention relates to a hand-held power tool having a drive unit for driving a tool receptacle, wherein the drive unit is provided with a planetary gear arranged in a transmission housing, the planetary gear having at least one hollow wheel, and wherein an intermediate shaft is connected to a planet carrier of the planetary gear. BACKGROUND

[0002] Such a hand-held power tool having a planetary gear is known from the prior art, wherein the hollow wheel is fixed in the transmission housing in the axial direction by means of a retaining ring. Furthermore, a hand-held power tool having a planetary gear is known from DE 10 2016 224 259 A1, wherein the hollow wheel is fixed on the transmission housing by means of a threaded connection. Here, the hollow wheel has an external thread and the transmission housing has an internal thread, which together form the threaded connection. SUMMARY

[0003] The invention relates to a hand-held power tool having a drive unit for driving a tool receptacle, wherein the drive unit is provided with a planetary gear arranged in a transmission housing, the planetary gear having at least one hollow wheel, and wherein an intermediate shaft is connected to a planet carrier of the planetary gear. The at least one hollow wheel is provided with a fixing element, which is configured for fixing the at least one hollow wheel in the transmission housing in the longitudinal direction of its axis of rotation, wherein the fixing element is arranged on the hollow wheel and / or the intermediate shaft.

[0004] The invention thus makes it possible to provide a hand-held power tool having a planetary gear, wherein the hollow wheel can be fixed in the transmission housing in the axial direction safely and reliably by means of the fixing element. The hollow wheel can thus be arranged in the transmission housing in a simple and uncomplicated manner, wherein a separate retaining element can be dispensed with.

[0005] Preferably, the fixing element is arranged at least sectionally on the intermediate shaft at the axial end of the at least one hollow wheel facing the tool receptacle.

[0006] The suitable arrangement of the fixing element can thus be achieved in a simple manner.

[0007] The fixing element is preferably formed on the planet carrier.

[0008] A space-saving configuration of the intermediate shaft having the fixing element can thus be achieved.

[0009] According to one embodiment, the fixing element is configured at least sectionally as a radial expansion on the outer circumference of the planet carrier.

[0010] Therefore, stable and robust fixing elements can be provided.

[0011] According to another embodiment, the fixing element is arranged on the hollow wheel at the axial end of the hollow wheel away from the tool receiving portion.

[0012] Therefore, it is possible to achieve a simple alternative arrangement of fixed components.

[0013] Preferably, the fixing element is constructed at least in sections on the inner circumference of the hollow wheel as a circumferential flange.

[0014] Therefore, it is possible to achieve a compact configuration of a hollow wheel with fixed components.

[0015] The planetary gear transmission is preferably single-stage.

[0016] Therefore, suitable planetary gear transmissions can be provided in a simple and uncomplicated manner.

[0017] According to one embodiment, the fixing element is integrally constructed or formed thereon with the hollow wheel or intermediate shaft, or is permanently connected to the hollow wheel or intermediate shaft.

[0018] Therefore, it is possible to arrange the fixing elements on the hollow wheel or intermediate shaft in a simple way.

[0019] Hollow wheels preferably have an anti-torsion device.

[0020] Therefore, the hollow wheel can be fixed in the transmission housing along both the axial and circumferential directions.

[0021] Preferably, the intermediate shaft is configured to drive the impact mechanism.

[0022] Therefore, a handheld machine tool with an impact mechanism and a planetary gear transmission can be provided. Attached Figure Description

[0023] The invention is described in more detail below with reference to embodiments shown in the accompanying drawings. The drawings illustrate:

[0024] Figure 1 Side view of a handheld machine tool with a transmission mechanism constructed as a planetary gear drive.

[0025] Figure 2 : Figure 1 The longitudinal section of the transmission device, wherein the hollow wheel belonging to the planetary gear transmission device has a fixed element.

[0026] Figure 3 : Figure 2 A three-dimensional view of the hollow wheel.

[0027] Figure 4 a longitudinal section of the transmission in Figure 1 , wherein the intermediate shaft assigned to the planetary transmission has a fixing element, and

[0028] Figure 5 a perspective view of the intermediate shaft of Figure 4 .

[0029] In the drawings, elements having the same or similar functions are provided with the same reference signs and are explained in detail only once. DETAILED DESCRIPTION

[0030] Figure 1 An exemplary hand-held power tool 100 is shown, which has a housing 105 with a handle 115. According to one embodiment, the hand-held power tool 100 can be able to be mechanically and electrically connected with a battery pack 190 for being powered independently of a power grid, but can also be operated alternatively, for example, dependent on a power grid.

[0031] In the housing 105, there is preferably a drive unit 180, which has at least one transmission unit 125 and an electric drive motor 180, which is preferably powered by the battery pack 190. Preferably, the transmission unit 125 is equipped with at least one transmission 120. The at least one transmission 120 is preferably configured as a planetary transmission and is therefore referred to as "planetary transmission 120" in the following.

[0032] For example, the hand-held power tool 100 is configured as a rotary impact driver with an impact mechanism 150. Here, the impact mechanism 150 is preferably assigned to the transmission unit 125. However, it is pointed out that the present application is not limited to a rotary impact driver, but can generally be applied to different hand-held power tools with and without an impact mechanism 150, for example, in a battery-powered drill / driver, which can have a drive motor 180 and a transmission unit 125.

[0033] The drive motor 180 can be switched on and off, for example, by means of a manual switch 195. Preferably, the drive motor 180 is configured as an electronically commutated motor.

[0034] The hand-held power tool 100 is graphically equipped with a tool receptacle 140 for receiving a plug-in tool, for example, a driver bit. The drive motor 180 is preferably configured for driving the tool receptacle 140 and thus the plug-in tool.

[0035] Figure 2 A transmission unit 125 with a planetary transmission 120, an impact mechanism 150 and a tool receptacle 140 is shown. Figure 1

[0036] ​​​Preferably, the impact mechanism 150 is configured as a rotary impact mechanism, in particular as a V-groove rotary impact mechanism. The impact mechanism 150 is preferably configured for converting the continuous output power of the drive motor 180 into an impact-like rotary momentum. Here, the energy output of the drive motor 180 is transferred to the tool receptacle 140 by means of the impact of the impactor 242 on the corresponding anvil 249 by means of a high power intensity pulse.

[0037] The anvil 249 is preferably configured in one piece with the tool receptacle 140. The impactor 242 is preferably supported in such a way that a movement in the axial direction 201 of the transmission unit 125, or in other words in the longitudinal axis 209 of the transmission unit 125, and a movement in the radial direction 203, or in other words perpendicular to the longitudinal axis 209, are possible.

[0038] The control of the movement in the axial direction 201 is preferably effected by means of the V-groove 222 and a carrier ball (not shown). The spring 243 is responsible for the return movement of the impactor 242. Such an impact mechanism is sufficiently known from the prior art, so that a detailed explanation is omitted here for the sake of brevity and clarity of the description.

[0039] The impactor 242 is preferably arranged on the intermediate shaft 220, wherein the V-groove 222 is arranged on a section 221 of the intermediate shaft 220 facing the tool receptacle 140. Preferably, the intermediate shaft 220 is configured for driving the impact mechanism 150 and is rotatably movably supported in the transmission housing 205 by means of a bearing element 252 facing away from the tool receptacle 140.

[0040] The intermediate shaft 220 is diagrammatically at least substantially aligned with a drive shaft (not shown) of the drive motor 180. Furthermore, the intermediate shaft 220 preferably has a receptacle 225 which is provided for at least partially receiving the drive shaft. The receptacle 225 preferably extends at least substantially along the longitudinal axis 209 of the transmission unit 125. In the assembled state, the drive shaft at least partially extends into the intermediate shaft 220, in particular into the receptacle 225 of the intermediate shaft 220.

[0041] Preferably, the planetary gear transmission 120 is configured as a single-stage planetary gear transmission having a planet carrier 223 which is drivable by the drive shaft and a plurality of planet wheels 232. Here, the intermediate shaft 220 has on its end facing away from the tool receptacle 140 preferably the planet carrier 223 of the planetary gear transmission 120. The intermediate shaft 220 preferably has a plurality of planet wheel receptacles and planet wheel bearing sites 228 arranged in the circumferential direction. The planet wheel receptacles 229 are preferably at least substantially cylindrically segmentally configured. In each planet wheel receptacle 229 one planet wheel 232 is respectively arranged which is rotatably supported by means of a pin.

[0042] The intermediate shaft 220 preferably has three planetary wheel receiving portions 229, which each have one planetary wheel bearing point 228. The planetary wheel receiving portions 229 are separated from one another by webs 224, which extend radially with respect to the longitudinal axis 209 of the transmission unit 125. The planetary wheel receiving portions 229 are delimited, viewed along the longitudinal axis 209 of the transmission unit 125, by two disc-shaped wall elements 298, 299, which are arranged at least substantially perpendicularly to the longitudinal axis 209. The wall elements 298, 299 are at least substantially circularly configured. The wall elements 298, 299 are configured in one piece with the intermediate shaft 220.

[0043] The planetary gear transmission 120 preferably comprises at least one hollow wheel 210, which has a toothing 213 on its inner circumference 219 along its axis of rotation 296. The hollow wheel 210 is preferably shell-fixed and arranged in the transmission housing 205 in a torsion-proof manner.

[0044] In order to arrange the hollow wheel 210 in the transmission housing 205 in a torsion-proof manner, the hollow wheel 210 preferably has an anti-torsion device 216, which is configured, as illustrated, as at least one expansion in the axial direction 201, or in the longitudinal direction 297, of the hollow wheel 210, wherein the at least one expansion is configured only sectionally in the circumferential direction and is arranged in a receiving portion of the transmission housing 205 and thus prevents the hollow wheel 210 from being twisted about its axis of rotation 296. There is preferably provided at least one expansion; however, there can be any number of expansions arranged distributed in the circumferential direction.

[0045] It is pointed out that the anti-torsion device 216 can also be configured as an expansion in the radial direction 203. Preferably, the anti-torsion device 216 is configured on the end 218 of the hollow wheel 210 facing away from the tool receiving portion 140, and the toothing 213 is arranged on the end 217 facing towards the tool receiving portion 140.

[0046] The hollow wheel 210 is preferably equipped with a fixing element 212, which is configured for fixing the hollow wheel 210 in the axial direction 201, or in the longitudinal direction 297, in the transmission housing 205. Here, the fixing element 212 is arranged on the hollow wheel 210 and / or on the intermediate shaft 220. Preferably, the fixing element 212 is configured in one piece with the hollow wheel 210 and / or with the intermediate shaft 220. Alternatively, the fixing element 212 can also be formed on the hollow wheel 210 and / or on the intermediate shaft 220. Furthermore, the fixing element 212 can also be permanently connected with the hollow wheel 210 and / or with the intermediate shaft 220. According to a further embodiment, the fixing element 212 can be configured as a separate part. Here, the fixing element 212 can be configured in multiple pieces. Here, the fixing element 212 is preferably configured as a disc, in particular as an annular disc.

[0047] The hollow wheel 210 preferably has an end 218 facing away from the tool receptacle 140 and an end 217 facing the tool receptacle 140.

[0048] According to one embodiment, the securing element 212 is arranged on the end 218 of the hollow wheel 210 facing away from the tool receptacle 140. Here, the securing element 212 is preferably configured at least sectionally as a circumferential flange 214 on the inner circumference 219 of the hollow wheel 210. However, the securing element 212 can also be configured only as at least one circular segment. Alternatively, the securing element 212 can also be configured as a disc which is arranged on the inner circumference 219 of the hollow wheel 210. Here, the securing element 212 configured as a disc, in particular as an annular disc, can be assigned a positioning section. This positioning section can here, for example, consist of a swivel tab or a rupture disc. In order to secure the hollow wheel 210 in the longitudinal direction 297, the securing element 212 is arranged on the side of the wall element 298 of the planet carrier 223 facing away from the tool receptacle 140.

[0049] Figure 3 The hollow wheel 210 is shown Figure 2 with a toothing 213 arranged on the axial end 217 and an anti-rotation device 216 configured on the opposite axial end 218 and a securing element 212 configured as a circumferential flange 214. Here, the circumferential flange 214 has a smaller inner radius than the toothing 213 of the hollow wheel 210.

[0050] Figure 4 The drive unit 125 is shown Figure 2 with the securing element 212 arranged on the intermediate shaft 220 according to one alternative embodiment. Here, the securing element 212 is arranged on the intermediate shaft 220 at the axial end 217 of at least one hollow wheel 210 facing the tool receptacle 140. In particular, the securing element 212 is shaped on the planet carrier 223.

[0051] Here, the securing element 212 is preferably configured at least sectionally as a radial expansion 414 on the outer circumference 428 of the planet carrier 223 or an expansion in the radial direction 203 of the drive unit 125. Preferably, the securing element 212 is configured as a radial expansion 414 of the wall element 299 of the planet carrier 223 facing the tool receptacle 140. Preferably, the wall element 299 and the radial expansion 299 are configured integrally. Alternatively, the securing element can be configured as a disc, in particular an annular disc, which is preferably arranged on the outer circumference 428 of the planet carrier 223. Here, the securing element 212 configured as a disc, in particular as an annular disc, can be assigned a positioning section. This positioning section can here, for example, consist of a swivel tab or a rupture disc.

[0052] Figure 5 The drive unit 125 is shown Figure 4the intermediate shaft 220 and shows the configuration of the fixing element 212 or the radial expansion 414. Here, the fixing element 212 is configured as a circumferential flange, similar to Figure 2 and Figure 3 the embodiment of the fixing element 212 is configured as a circumferential flange. Furthermore, the fixing element 212 is preferably configured as a protection element to prevent the ingress of particles into the transmission 120. However, the fixing element 212 can also be configured as at least one circular arc segment. Furthermore, Figure 5 the planetary wheel receptacle 229 is shown.

[0053] It is pointed out that the fixing element 212 can be arranged on the hollow wheel 210 or on the intermediate shaft 220 or on the planet carrier 223. Here, the fixing element 212 can be configured as a circumferential flange or as at least one circular arc segment. Furthermore, a plurality of circular arc segments distributed in the circumferential direction can also be provided. Furthermore, the fixing element 212 can be arranged on the hollow wheel 210 and on the intermediate shaft 220 or on the planet carrier 223. Alternatively, the transmission unit 125 can also be configured as a multi-stage planetary gear transmission 120.

Claims

1. A hand-held power tool (100) having a drive unit (120, 180) for driving a tool-receiving portion (140), wherein The drive unit (120, 180) is equipped with a planetary gear (120) arranged in a transmission housing (205), the planetary gear having at least one hollow wheel (210), and with an intermediate shaft (220), the intermediate shaft (220) being connected to a planet carrier (223) of the planetary gear (120), characterized in that the at least one hollow wheel (210) is equipped with a fixing element (212) which is configured for fixing the at least one hollow wheel (210) in the transmission housing (205) along a longitudinal direction (297) of its axis of rotation (296), wherein the fixing element (212) is arranged on the hollow wheel (210), wherein the fixing element (212) is arranged on the hollow wheel (210) on an axial end (218) of the hollow wheel (210) facing away from the tool receptacle (140), and wherein the hollow wheel (210) has an anti-twist device (216), wherein the anti-twist device (216) is configured as at least one expansion in the longitudinal direction (297) of the hollow wheel (210).

2. The hand-held power tool as claimed in claim 1, characterized in that The fixing element (212) is arranged at least sectionally on the intermediate shaft (220) at an axial end (217) of the at least one hollow wheel (210) facing the tool receptacle (140).

3. The hand-held power tool as claimed in claim 2, characterized in that The fixing element (212) is formed on the planet carrier (223).

4. The hand-held power tool according to claim 3, characterized in that The fixing element (212) is configured at least sectionally on an outer circumference (428) of the planet carrier (223) as a radial expansion (414).

5. The hand-held power tool according to Claim 1, characterized in that The fixing element (212) is configured at least sectionally on an inner circumference (219) of the hollow wheel (210) as a circumferential flange (214).

6. The hand-held power tool according to any one of the preceding claims, characterized by The planetary gear (120) is single-stage.

7. The hand-held power tool according to any one of the preceding claims, characterized by The fixing element (212) is integrally configured with or formed on the hollow wheel (210) or the intermediate shaft (220) or is permanently connected to the hollow wheel (210) or the intermediate shaft (220).

8. The hand-held power tool according to any one of the preceding claims, characterized in that, The intermediate shaft (220) is configured for driving a percussion mechanism (150).

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