CN119526318A - Hand-held power tool with planetary gear - Google Patents

Abstract

The invention relates to a hand-held power tool (100) comprising a tool receiving part and a housing, in which a planetary gear (120) having at least one first planetary stage (202) and a second planetary stage (203) for driving the tool receiving part and a drive motor (180) having a drive shaft (215) for driving the planetary gear (120), the first planetary stage (202) having at least three planetary wheels (233, 234) which are connected to one another by a carrier ring (263), wherein the carrier ring (263) is arranged in a hollow wheel (251) of the planetary gear (120).

Description

Hand-held power tool with planetary gear

Technical Field

The invention relates to a hand-held power tool having a tool receiving part and a housing in which a planetary gear having at least one first planetary stage and one second planetary stage for driving the tool receiving part and a drive motor having a drive shaft for driving the planetary gear are arranged.

Background

Such hand-held power tools having a tool receiver and a housing in which a planetary gear is arranged, which has a first and a second planetary stage for driving the tool receiver, are known from the prior art. Furthermore, a drive motor is provided, which has a drive shaft for driving the planetary gear.

Disclosure of Invention

The invention relates to a hand-held power tool having a tool receiving part and a housing in which a planetary gear having at least one first planetary stage and one second planetary stage for driving the tool receiving part and a drive motor having a drive shaft for driving the planetary gear are arranged. The first planetary stage has at least three planetary wheels which are connected to one another by a carrier ring, wherein the carrier ring is arranged in a ring gear of the planetary gear.

The invention can thus provide a robust and compact hand-held power tool.

Preferably, at least three planetary gears are connected to one another by a further carrier ring, which is arranged in a rotationally movable manner in a gear housing associated with the first planetary stage, in particular in a receptacle of the gear housing.

Thus, the planetary transmission can be safely and robustly arranged.

Preferably, at least the first planetary stage is arranged in the transmission housing.

Thus, the first planetary stage can be arranged simply and without complexity.

According to one embodiment, the transmission housing has a receptacle for receiving a bearing element, wherein the bearing element is configured for supporting a drive shaft having an axis of rotation, and wherein the bearing element is arranged perpendicular to the axis of rotation within the first and/or second carrier ring.

Therefore, the drive shaft can be supported safely and robustly.

Preferably, the bearing element is arranged in the transmission housing along the rotation axis.

Thus, a compact arrangement can be achieved in a simple manner.

According to one embodiment, the ring gear associated with the first planetary stage and the sun gear provided for driving the second planetary stage are formed in one piece.

The installation space required for constructing the planetary gear can thus be reduced simply and without complexity.

Preferably, the ring gear and the sun gear have a common axis of rotation and are connected to one another by webs oriented perpendicular to the axis of rotation.

Thus, a robust and stable connection of the ring gear to the sun gear can be achieved.

The ring gear preferably has an inner gear part and is arranged in the housing in a rotationally movable manner.

Thus, a simple and uncomplicated arrangement of the hollow wheel in the housing can be achieved.

Preferably, a ring gear is assigned to the first planetary stage, which ring gear is arranged in a rotationally fixed manner in the housing, wherein at least three planetary transmissions each have a first gear section operatively connected to the rotationally fixed ring gear and each have a second gear section operatively connected to the ring gear.

The transmission of rotation from the drive motor to the planetary gear can thus be realized in a simple manner.

Preferably, the first gear section and the second gear section have different diameters.

Thus, a simple and uncomplicated compact planet wheel with a reduced longitudinal dimension can be provided.

According to one embodiment, in an operating mode of the hand-held power tool, in particular in a hammer mode or a percussion drill mode, the output shaft which can be driven by the planetary gear can be arranged in sections in the planetary gear.

Thus, a further compression of the hand-held power tool can be achieved.

The output shaft can be arranged in sections in the inner receptacle of a sun gear or a ring gear of the planetary gear set, which is arranged facing the output shaft.

Thus, a safe and reliable arrangement of the segments of the output shaft in the planetary gear can be achieved.

Drawings

The invention is explained in more detail in the following description on the basis of embodiments shown in the drawings. The drawings show:

Figure 1 is a schematic view of a hand-held power tool with a drive motor and a planetary gear,

Figure 2 is a longitudinal section through the drive motor and planetary transmission of figure 1,

Figure 3 is an exploded perspective view of the planetary stage associated with the planetary transmission of figure 2,

Figure 4 is a perspective view of the transmission member associated with the planetary stage of figures 2 and 3,

Figure 5 is a longitudinal section of the first planetary stage of figures 2 to 4,

FIG. 6 is a longitudinal section of an alternative planetary stage of the planetary transmission of FIG. 1 in a first position of the output shaft, and

Fig. 7 is a longitudinal section of the alternative planetary stage of fig. 6 in another position of the output shaft.

In the drawings, elements having the same or similar functions are provided with the same reference numerals and are described in detail only once.

Detailed Description

Fig. 1 shows an exemplary hand-held power tool 100 having a housing 105 in which a drive unit for rotationally driving a tool receiver 140 is preferably arranged. Illustratively, hand-held power tool 100 can be mechanically and electrically connected to battery pack 190 for mains-independent power supply, for which purpose mains-dependent operation can alternatively or additionally also be used.

The tool receiver 140 is illustratively designed to receive the insertion tool 198 and rotate about an associated axis of rotation 199 during operation. Tool receiving portion 140 is illustratively configured as a drill chuck 145. Alternatively, however, the tool receiver 140 may also be configured as a tool attachment, which is releasably arranged on the hand-held power tool 100. The hand-held power tool 100 is configured, for example, as a drill driver, but may also be configured as a percussion drill with a percussion mechanism or as a drill hammer.

In the embodiment shown, the drive unit has at least one drive motor 180 and a transmission 120. Preferably, the drive motor 180 is configured as an electronically commutated motor. Preferably, the drive motor 180 can be turned on and off by a manual switch 195, wherein the manual switch 195 is graphically arranged on the handle 115 of the housing 105.

The transmission 120 is designed as a planetary transmission, preferably as a switchable planetary transmission. Preferably, the planetary transmission 120 is disposed in a transmission housing (220 in FIG. 2).

In addition, hand power tool 100 optionally includes a torque adjustment device having a torque adjustment sleeve 197. Such torque adjusting devices are sufficiently known from the prior art that a detailed description of alternative torque adjusting devices is omitted here for the sake of brevity of description.

Fig. 2 shows a drive motor 180 for driving the planetary gear 120, which drive motor is provided with a drive shaft 215, and an optional fan 210 is arranged on the side of the drive motor 180 facing away from the planetary gear 120 or on the left side of the drive motor 180 illustrated.

The planetary gear 120 is arranged, for example, in a gear housing 220. The transmission housing 220 illustratively has three housing sections 221, 222, 223. Here, the housing section 221 is arranged facing the drive motor 180, and the housing section 223 is arranged facing the output shaft 240 assigned to the tool receiver 140 of fig. 1. The housing section 222 is arranged between the two housing sections 221, 223 along the rotational axis 199 of fig. 1, which also forms, for example, the rotational axis of the drive motor 180 and of the planetary gear set 120.

The planetary gear 120 preferably has at least one first and second planetary stage 202, 203 for driving the tool receiver 140. Three planetary stages 202, 203, 204 are shown diagrammatically.

Preferably, the planetary gear set has at least three planetary gears, respectively, wherein at most two planetary gears can be seen in fig. 2, and therefore are described further below. Illustratively, the first planetary stage 202 has planets 233, 234.

According to one embodiment, the planet wheels 233, 234 are connected to each other by a carrier ring 263. The carrier ring 263 is preferably arranged in the ring gear 251 of the planetary gear 120, in particular of the first planetary stage 202. For this purpose, the hollow wheel 251 has a receptacle 268 in which the carrier ring 263 can be arranged. The hollow wheel 251 preferably has an internal toothing 253. Furthermore, the ring gear 251 is arranged in a rotationally movable manner in the housing 105, in particular in the transmission housing 220 or in the first housing section 221. At least the first planetary stage 202 is arranged in a housing section 221 of the transmission housing 220. Each planet wheel 233, 234 is assigned a shaft 262, 261, via which shaft 262, 261 the planet wheel 233, 234 is arranged on the carrier ring 263.

According to another embodiment, the planet wheels 233, 234 are connected to each other by a further carrier ring 263. The carrier ring 263 is preferably arranged in a rotationally movable manner in the transmission housing 220 or the first housing section 221 associated with the first planetary stage 202. For this purpose, the housing section 221 has a receptacle 269.

Furthermore, a ring gear 265, which is rotatably arranged in the housing 105, in particular in the transmission housing 220 or the first housing section 221, is assigned to the first planetary stage 202. It should be noted that the rotationally fixed hollow wheel 265 may alternatively also be formed integrally with the first housing section 221. The planet wheels 233, 234 are also arranged in the hollow wheel 265 and can roll therein.

Each planet 233, 234 has a first gear section 281 and a second gear section 282, respectively. The first gear segment 281 is preferably operatively connected to the rotationally fixed hollow wheel 265, while the second gear segment 282 is operatively connected to the hollow wheel 251. According to one embodiment, the first gear section 281 and the second gear section 282 have different diameters 298, 299. Preferably, the first diameter 298 associated with the first gear section 281 is smaller than the second diameter 299 associated with the second gear section 282.

The planet wheels 233, 234, in particular the respective second gear section 282 of the planet wheels, are diagrammatically driven by a sun wheel 229 arranged on the drive shaft 215. The second gear segment 282 in turn drives the ring gear 251 via its internal toothing 253. Furthermore, the planet wheels 233, 234 move together with their first gear section 281 along the inner toothing 266 of the fixed hollow wheel 265.

According to one embodiment, the ring gear 251 associated with the first planetary stage 202 and the sun gear 252 provided for driving the second planetary stage 203 are constructed in one piece. In this case, the ring gear 251 and the sun gear 252 form a gear element 250. Preferably, ring gear 251 and sun gear 252 have a common axis of rotation 199. In addition, the ring gear 251 and the sun gear 252 are preferably connected to one another by webs (342 in fig. 3) oriented perpendicular to the rotational axis 199.

At least three planet wheels of the second planetary stage 203 are preferably arranged on the outer toothing 254 of the sun gear 252, wherein only the planet wheels 235, 236 are visible here. Illustratively, planetary gears 235, 236 are assigned a hollow gear 276 having a switching wire bow 278. The second planetary stage 203 is disposed in a second housing 222. Shafts 206, 207 are assigned to planet wheels 235, 236. A carrier ring 205 is arranged along the rotation axis 199 between the ring gear 251 and the planet gears 235, 236. The carrier ring 205 supports shafts 206, 207 of the planets 235, 236. The carrier ring 272 is preferably arranged on the side of the planet gears 235, 236 facing the output shaft 240. Load ring 272 also supports shafts 206, 207.

Furthermore, the sun gear 271 of the third planetary stage 204 is assigned to the carrier ring 272 in the illustrated manner. According to one embodiment, the carrier ring 272 and the sun gear 271 are integrally constructed. The planet gears 237, 238 are in turn assigned to a sun gear 271. The planetary gears 237, 238 are in turn operatively connected, for example, to a switching idler 275 having a switching wire bow 277. Furthermore, a driver 273 is preferably provided, which transmits the rotary movement of the third planetary stage 204 to the output shaft 240.

The sun gears 252, 271 preferably have inner receptacles 255, 274, respectively, having a larger diameter than the output shaft 240. The output shaft 240 is supported in the third housing section 223, for example, by the inner receiver 212 of the driver 273 and by the bearing element 232. For this purpose, the third housing section 223 preferably has a bearing receptacle 225.

According to one embodiment, in an operating mode of hand-held power tool 100, in particular a hammer mode or a percussion drill mode, output shaft 240 driven by planetary gear unit 120 can be arranged in planetary gear unit 120 in a section along a rotational axis 199 of drive motor 180. Here, the end side 283 of the output shaft 240 is arranged spaced apart from the end side 211 of the driver 273 in the direction of the drive motor 180. The output shaft 240 can be arranged in the inner receptacle 274 of the sun gear 271 or of the ring gear (630 in fig. 6) of the planetary gear set 120.

Illustratively, a bearing element 231 is arranged on the end of the transmission housing 220 facing the drive motor 180. The bearing element 231 is arranged, for example, in the receptacle 224 of the first housing section 221. The bearing element 231 is designed here for supporting the drive shaft 215. Preferably, the receiving portion 224 of the bearing element 231 is arranged perpendicular to the rotation axis 199 within the first and/or second carrier ring 263 (320 in fig. 3). Furthermore, the bearing element 231 is preferably arranged along the rotation axis 199 in the transmission housing 220 or the first housing section 221.

Fig. 3 illustrates the exemplary first planetary stage 202 of fig. 2. Fig. 3 shows a hollow wheel 265, which is arranged in a rotationally fixed manner in the gear housing 220 of fig. 2 and which has a rotationally fixed element 311 on its outer circumference. The anti-rotation element 311 is preferably embodied as a peripheral widening and can be arranged, for example, in an associated receptacle of the transmission housing 220 of fig. 2. Four anti-twist elements 311 are diagrammatically shown, wherein a gap 312 is formed between two adjacent anti-twist elements 311, respectively, in the circumferential direction.

Fig. 3 furthermore shows the planetary wheels 233, 234 of fig. 2, which have a first and a second gear segment 281, 282 and shafts 261, 262 for bearing on the carrier ring 263 or the carrier ring 320. Illustratively, carrier ring 320 is disposed facing hollow wheel 265, while carrier ring 263 is disposed facing transmission member 250 of fig. 2.

Fig. 3 furthermore shows a transmission component 250 with a ring gear 251 and a sun gear 252. The hollow wheel 251 and the sun wheel 252 are preferably connected to one another by a web 342 oriented perpendicular to the rotational axis 199 (see fig. 1 and 2) or in the radial direction 301.

Illustratively, the transmission member 250 has four tabs 342. It should be noted that the transmission member 250 may also have fewer or more than four tabs 342.

Fig. 4 shows the transmission member 250 of fig. 2 and 3 with a ring gear 251 and a sun gear 252. Fig. 4 shows a tab 342 and a receptacle 268 for receiving the carrier ring 263 of fig. 2 and 3.

Fig. 5 shows the exemplary first planetary stage 202 of fig. 2 and 3 with the transmission member 250 of fig. 2-4. The carrier ring 263 is arranged in the receiving portion 268 of the transmission component 250. The carrier ring 320 is here shown arranged on the left side of the ring gear 265. Fig. 5 also shows schematically a first diameter 298 associated with the first gear section 281, which is smaller than a second diameter 299 associated with the second gear section 282.

Fig. 6 shows an alternative planetary stage 602 with hollow wheels 640, 630 and planetary wheels 637, 638, which are arranged on a carrier ring 650 by means of shafts 661, 662, respectively. The planet gears 637, 638 are driven by a central sun gear 660.

The planets 637, 638 illustratively include a first tooth segment 681 having a first diameter 699 and a second tooth segment 682 having a second diameter 698. The first diameter 699 is preferably greater than the second diameter 698. In contrast to the embodiment of fig. 2 to 5, a first tooth segment 681 having a first diameter 699 is arranged facing away from the output shaft 240, while a second tooth segment 682 having a second diameter 698 is arranged facing the output shaft 240.

Furthermore, the ring gear 640, with its inner toothing 641 engaging the first tooth segment 681, is arranged facing away from the output shaft 240. The hollow wheel 630 meshes with the second tooth segment 682 with its inner toothing 631 and is arranged facing the output shaft 240. Preferably, the hollow wheel 630 is constructed integrally with the driver 273.

Similar to the embodiment of fig. 2 to 5, the output shaft 240 is supported by the bearing element 232 and the driver 273. In the arrangement shown in fig. 6, the end side 283 of the output shaft 240 and the end side 211 of the driver 273 are shown on a common cross-sectional line 601. The hollow wheel 630 has an inner receptacle 674 in which the output shaft 240 is preferably arranged in a sectionable manner. In fig. 6, the output shaft 240 is not disposed in the inner receptacle 674.

Fig. 7 shows the planetary stage 602 of fig. 6 in a hammer mode or a percussion drill mode, wherein the output shaft 240 can be arranged in sections in the planetary transmission 120 or the planetary stage 602 of fig. 1 and 2. In particular, the output shaft 240 is arranged in sections in the inner receptacle 674 of the ring gear 630. Here, the end side 283 of the output shaft 240 is arranged to be displaced by a distance 703 from the end side 211 of the driver 273 in the direction of the ring gear 640.

Furthermore, the end side 283 of the output shaft 240 is arranged, for example, in the longitudinal direction 701 of the planetary stage 602 in the ring gear 630. Furthermore, the end side 283 of the output shaft 240 is preferably arranged coaxially with the planetary gears 637, 638, in particular with the tooth segment 682.

Claims (12)

1. A hand-held power tool (100) having a tool receiver (140) and a housing (105), in which a planetary gear (120) having at least one first planetary stage (202) and a second planetary stage (203) for driving the tool receiver (140) and a drive motor (180) having a drive shaft (215) for driving the planetary gear (120) are arranged, characterized in that the first planetary stage (202) has at least three planetary wheels (233, 234) which are connected to one another by a carrier ring (263), wherein the carrier ring (263) is arranged in a hollow wheel (251) of the planetary gear (120).

2. Hand-held power tool according to claim 1, characterized in that the at least three planetary wheels (233, 234) are connected to one another by a further carrier ring (263) which is arranged in a rotationally movable manner in a gear housing (221) associated with the first planetary stage (202), in particular in a receptacle (269) of the gear housing (221).

3. Hand-held power tool according to claim 1 or 2, characterized in that at least the first planetary stage (202) is arranged in the gear housing (221).

4. A hand-held power tool according to claim 2 or 3, characterized in that the transmission housing (221) has a receptacle (224) for receiving a bearing element (231), wherein the bearing element (231) is designed to support the drive shaft (215), which has a rotation axis (199), and wherein the bearing element (231) is arranged perpendicular to the rotation axis (199) in a first and/or a second carrier ring (263; 320).

5. Hand-held power tool according to claim 4, characterized in that the bearing element (231) is arranged along the rotation axis (199) within the transmission housing (221).

6. Hand-held power tool according to any one of the preceding claims, characterized in that a ring gear (251) associated with the first planetary stage (202) and a sun gear (252) provided for driving the second planetary stage (203) are integrally formed.

7. The hand-held power tool according to claim 6, characterized in that the hollow wheel (251) and the sun wheel (252) have a common axis of rotation (199) and are connected to one another by webs (342) oriented perpendicular to the axis of rotation (199).

8. The hand-held power tool according to claim 6 or 7, characterized in that the hollow wheel (251) has an internal toothing (253) and is arranged in the housing (105) in a rotationally movable manner.

9. The hand-held power tool according to any one of the preceding claims, characterized in that the first planetary stage (202) is associated with a ring gear (265) which is arranged in a rotationally fixed manner in the housing (105), wherein the at least three planetary wheels (233, 234) each have a first gear section (281) which is operatively connected to the rotationally fixed ring gear (265) and each have a second gear section (282) which is operatively connected to the ring gear (251).

10. The hand-held power tool according to claim 9, characterized in that the first gear section (281; 681) and the second gear section (282; 682) have different diameters (298, 299;698, 699).

11. The hand-held power tool according to any of the preceding claims, characterized in that in an operating mode of the hand-held power tool (100), in particular a hammer mode or a percussion drill mode, an output shaft (240) drivable by the planetary gear (120) can be arranged in sections within the planetary gear (120).

12. The hand-held power tool according to claim 11, characterized in that the output shaft (240) can be arranged in sections in an inner receptacle (274; 674) of a sun wheel (271) or a ring gear (630) of the planetary gear (120) arranged facing the output shaft (240).