CN219893939U

CN219893939U - Portable work apparatus

Info

Publication number: CN219893939U
Application number: CN202320236891.5U
Authority: CN
Inventors: D·克莱特; H·迪尔
Original assignee: Andreas Stihl AG and Co KG
Current assignee: Andreas Stihl AG and Co KG
Priority date: 2022-02-21
Filing date: 2023-02-16
Publication date: 2023-10-27
Anticipated expiration: 2033-02-16
Also published as: EP4230352A1

Abstract

The utility model relates to a portable work apparatus, comprising: a housing (2); a tool (9), wherein a first suction opening (11) and a second suction opening (12) for cooling air for cooling the drive motor (5) are formed at the housing (2); a first cooling air channel (13) and a second cooling air channel (14), wherein the first cooling air channel (13) extends from the first suction opening (11) up to a first end (7) of a motor housing (20) of the drive motor (5), and wherein the second cooling air channel (14) extends from the second suction opening (12) up to a second end (8) of the motor housing (20) of the drive motor (5), wherein the first cooling air channel (13) and the second cooling air channel (14) are connected to each other by a bypass (15).

Description

Portable work apparatus

Technical Field

The present utility model relates to a portable work apparatus.

Background

Portable work apparatuses are known from the prior art, which have a housing, a drive motor arranged in the housing, and a tool driven by the drive motor. One or more suction ports are provided at the housing for cooling the drive motor. The cooling air can flow into the housing through the suction inlet, cool the drive motor, and flow out through the discharge opening.

It has been shown with such appliances that a reduction in cooling performance occurs during operation of the work implement. This may cause overheating of the drive motor and the electronic components. Therefore, the operator must adjust the use of the work implement until the work implement cools. It is also known that overheating of the work implement can also lead to damage to the work implement.

Disclosure of Invention

The object of the present utility model is therefore to provide a portable work apparatus which reliably ensures sufficient cooling performance for cooling a drive motor.

This object is achieved by a portable work apparatus comprising:

a housing having a rear end and a front end,

a tool, wherein the tool is arranged at the front end of the housing,

a drive motor arranged in the housing between the rear end and the front end, having an axis of rotation, for driving the tool, wherein the drive motor has a motor housing with a first end facing the rear end of the housing and a second end facing the front end of the housing,

wherein a first suction opening and a second suction opening for cooling air for cooling the drive motor are formed at the housing,

wherein the first suction opening is arranged between the rear end of the housing and the first end of the motor housing of the drive motor,

wherein the second suction opening is arranged between the front end of the housing and the first end of the motor housing of the drive motor,

a first cooling air channel and a second cooling air channel, wherein the first cooling air channel extends from the first suction opening up to a first end of a motor housing of the drive motor, and wherein the second cooling air channel extends from the second suction opening up to a second end of the motor housing of the drive motor,

-wherein the first cooling air channel and the second cooling air channel are connected to each other by a bypass.

It can be observed that during operation of the work implement, the suction inlet of the housing of the work implement may become blocked and prevent the supply of cooling air. The present utility model is now based on the recognition that blockage of the suction opening essentially causes two effects. On the one hand, the supply of total cooling air is reduced, whereby the cooling performance of the work implement is also reduced. On the other hand, the cooling performance is only partially provided, for example by means of substantially one suction opening, whereby uneven cooling of the drive motor and/or the electronic components takes place. In particular, the assembly that will be bypassed with cooling air from the blocked suction inlet is subject to insufficient cooling.

The portable working implement according to the present utility model comprises: a housing having a rear end and a front end; a tool, wherein the tool is disposed at a front end of the housing; a drive motor arranged in the housing between the rear end and the front end, the drive motor having a rotation axis, the drive motor having a motor housing having a first end facing the rear end of the housing and a second end facing the front end of the housing, wherein a first suction opening and a second suction opening for cooling air are configured at the housing, the cooling air being used for cooling the drive motor, wherein the first suction opening is arranged between the rear end of the housing and the first end of the motor housing of the drive motor, wherein the second suction opening is arranged between the front end of the housing and the first end of the motor housing of the drive motor; a first cooling air channel and a second cooling air channel, wherein the first cooling air channel extends from the first suction port up to a first end of a motor housing of the drive motor, and wherein the second cooling air channel extends from the second suction port up to a second end of the motor housing of the drive motor, wherein the first cooling air channel and the second cooling air channel are connected to each other by a bypass.

The portable working implement according to the utility model is provided with a first cooling air channel and a second cooling air channel for cooling the drive motor. Alternatively, the cooling air channels are connected to each other by a bypass.

If one of the two suction ports is blocked, the lack of cooling air at the blocked suction port can be compensated by the cooling air flowing in through the bypass. The cooling air is uniformly distributed through the bypass to the cooling air passage connected to the suction port. As a result, a locally missing cooling performance can be compensated, whereby a uniform and reliable cooling of the drive motor and/or the electronic components is ensured.

Advantageously, it is provided that the drive motor comprises a fan wheel which rotates about the axis of rotation, wherein a first cooling air flow flowing along the first cooling air channel and a second cooling air flow flowing along the second cooling air channel are generated by the fan wheel during operation of the drive motor. At least one outlet opening for discharging the cooling air flow from the housing is advantageously provided at the housing. This allows the warmed cooling air to be transported out of the housing of the work apparatus.

The bypass extends in particular outside the drive motor. A distribution of cooling air outside the drive motor can be achieved. The cooling air surrounds the drive motor and causes uniform cooling. Preferably, the plane of rotation, which is open at the fan wheel, intersects the bypass. Thus, the bypass is located at the level of the drive motor. The bypass is preferably arranged next to the motor housing 20.

A first filter is preferably provided at the suction opening, wherein the first filter is preferably a metal filter. A second filter is provided in particular at the suction opening, wherein the second filter is preferably a foam filter. The first filter at the first suction opening and the first filter at the second suction opening are in particular configured separately from each other. Also, the second filter at the first suction port and the second filter at the second suction port are separately constructed. The filter is provided for filtering particles so as not to contaminate the drive motor and other components arranged in the housing of the work implement. The first filter, which is designed as a metal filter, serves to filter coarse dirt particles. Conversely, a second filter, which is constructed as a foam filter, is used to filter smaller dirt particles. The second filter preferably has a smaller pore size than the first filter. The first filter and the second filter are arranged one after the other at each suction port. The first filter and the second filter are each arranged at the intake opening in such a way that the intake air or the cooling air flow first flows through the first filter and then through the second filter.

Advantageously, the first suction opening and the second suction opening are arranged offset relative to one another at an angular distance with respect to the axis of rotation of the drive motor. The angular distance between the suction openings is at least 15 °, preferably at least 25 °, in particular about 30 °. The angular distance between the suction openings is preferably at most 150 °, in particular at most 120 °, preferably at most 90 °. Advantageously, the first suction opening has a first distance from the front end of the housing and the second suction opening has a second distance from the front end of the housing, wherein the first distance is greater than the second distance.

During operation of the work implement, dirt particles are generated by the tool in use and distributed on the housing. The flight path of such dirt particles is here largely dependent on the type of tool, the position of the work implement, and also external influencing factors, such as weather, etc. If the working implement is embodied, for example, as a tree pruner, the formed sawdust flies at least partially from the tool onto the housing. By arranging the suction openings offset with respect to each other, the probability of simultaneous clogging of the suction openings is reduced, since at least one of the two suction openings is not located in the flight path of dirt particles. This advantage is obtained not only by the angular spacing of the suction openings relative to each other but also by the different spacing of the suction openings relative to the front end of the housing.

The housing preferably has an overall length extending from the rear end to the front end. The first distance corresponds to preferably at least 50%, preferably at least 70%, in particular approximately 80% of the total length of the housing. The second distance corresponds to at least 25%, preferably at least 35%, in particular at least 40% of the total length of the housing. The suction openings are thus also arranged offset relative to one another in the direction of the axis of rotation of the drive motor or in the longitudinal direction of the work implement.

Preferably, the housing has an upper side, a lower side, a first longitudinal side and a second longitudinal side, wherein the first suction opening is arranged on the upper side of the housing. Thus, the first suction opening, which is located on the upper side of the housing with respect to the front end of the housing and thus also with respect to the tool, is located at a greater distance. The second suction port, which is arranged closer to the front housing side, is preferably arranged on one of the two longitudinal sides of the housing. Due to the orientation of the guide rail and the associated direction of movement of the saw chain, the pole trimmer and the motor saw are in principle prone to soiling at the upper and lower sides of the housing. The suction opening, which is arranged closer to the tool and thus also closer to the source of dirt particles, is preferably configured on one of the two longitudinal sides in a manner that protects against dirt.

Drawings

Further features of the utility model result from the following description and from the embodiments shown in the drawings. Wherein:

fig. 1 shows an embodiment of a portable working implement in a perspective view, with a guide tube and a tool at one end of the guide tube and an energy source at the other end of the guide tube,

figure 2 shows a portable working implement according to the utility model with a schematically indicated guide tube in a side view,

figure 3 shows in top view the portable work apparatus according to figure 2,

figure 4 shows the portable work apparatus according to figure 2 in a view from below,

figure 5 shows in a cross-sectional view the portable work apparatus according to figure 2 in a view from above,

fig. 6 shows a working implement according to the utility model in a schematic view and

fig. 7 shows the portable work apparatus according to fig. 2 in a lateral sectional view.

Detailed Description

In the drawings like elements are provided with like reference numerals.

Fig. 1 shows a portable working device 1, which is designed as a pole trimmer. The portable working device 1 can also be configured as a power chain saw, hedge trimmer, circular saw or the like. The portable work apparatus 1 comprises a housing 2, a drive motor 5 arranged in the housing 2, and a tool 9 which can be driven by the drive motor 5. As shown in fig. 5 to 7, the drive motor 5 is configured as an electric motor. The electric motor can be a direct current motor in the form of a commutated motor or an EC-motor (for example a universal motor, a brushless direct current motor or an electronically commutated direct current motor) which is operated by a direct voltage by means of a control device. In an alternative embodiment of the portable power tool, the drive motor can also be configured as an internal combustion engine.

As shown in fig. 1, the portable work apparatus 1 comprises a guide tube 51 having a first end 52 and a second end 53. The housing 2 of the work implement 1 is held at the first end 52 of the guide tube. The second housing 54 is held at the second end 53 of the guide tube 51. The second housing 54 has a receiving slot 55 for receiving a battery or the like energy source. It is possible to use a stationary power supply network as the energy source, which is connected to the second housing 54 or to the control electronics arranged in the second housing 54 by means of electrical lines. In the embodiment shown, an operating handle 56 with an operating element is provided at the second end 53 of the guide tube 51. In the illustrated embodiment, an operating element called an operating lever 57 or throttle lever and a lock lever 58 are provided as the operating elements. The operation lever 57 is used to control the drive motor 5. The lock lever 58 is provided for stopping the operation lever 57.

As shown in fig. 1, the guide tube 51 is in the exemplary embodiment telescopically embodied. The guide tube 51 comprises a first tube section 62 with a first end 52 of the guide tube 51 and a second tube section 63 with a second end 53 of the guide tube 51. The guide tube 51 comprises a clamping device 59. The clamping device 59 is preferably fastened at the second tube section 63. The clamping device 59 is used to fix the first pipe section 62 at the second pipe section 63.

As shown in fig. 2, the housing 2 of the portable power tool 1 extends in the longitudinal direction 19 from the rear end 3 to the front end 4. The tool 9 is arranged at the front end 4 of the housing. The tool 9 is in the exemplary embodiment configured as a saw chain 33. The saw chain 33 is driven around the guide rail 32 in the running direction 37 in a revolving manner by a chain drive wheel 38 (fig. 5). The direction of travel 37 of the saw chain 33 is the direction of travel of the saw chain 33 provided for the proper operation of the work apparatus 1 for chip removal. The chain drive wheel 38 is rotationally driven by the drive motor 5. The guide rail 32 is arranged at the front end 4 of the housing 2 and extends in a longitudinal direction 34, which corresponds to the direction of the housing 2 from the rear end 3 to the front end 4. The saw chain 33 opens the tool plane 30, wherein not only the saw chain 33 but also the guide rail 32 are located in the tool plane 30.

As shown in fig. 2, the rail 32 includes an upper side 35 and a lower side 36. In a defined operation of the portable power tool 1, the saw chain 33 extends at the upper side 35 of the guide rail 32 in a direction away from the front end 4 of the housing 2. In a satisfactory operation of the portable power tool 1, the saw chain 33 extends at the underside 35 of the guide rail 32 toward the front end 4 of the housing 2. Not only the upper side 35 of the guide rail 32 but also the lower side 36 of the guide rail 32 are located in the tool plane 30.

As shown in fig. 2 and 3, the housing 2 extends from its rear end 3 to its front end 4 along its longitudinal direction 19. The rear end 3 forms a first end side 39 of the housing 2. The front end 4 of the housing 2 forms a second end side 40 of the housing 2. The housing 2 comprises an upper side 26 and a lower side 27. Furthermore, the housing 2 comprises a first longitudinal side 28 and a second longitudinal side 29. The first 39 and second 40 end sides of the housing 2 are connected to each other by the upper 26, lower 27, first 28 and second 29 longitudinal sides of the housing 2. In a defined operation of the work apparatus 1, the upper side 26 of the housing 2 is located above the lower side 27 of the housing 2. The vertical direction 45 extending from the lower side 27 toward the upper side 26 opens the longitudinal plane 46 of the housing 2 together with the longitudinal direction 19 or the rotational axis 6 of the drive motor 5. The housing 2 comprises a transverse plane 47 oriented orthogonally with respect to the longitudinal plane 46 and with respect to the vertical direction 45. The longitudinal side portions 28, 29 are arranged opposite each other with respect to the longitudinal plane 46. The upper side 26 and the lower side 27 are arranged opposite each other with respect to the transverse plane 47. In an embodiment, the longitudinal plane 46 of the housing 2 is oriented parallel to the tool plane 30.

As shown in fig. 5 to 7, a drive motor 5 configured as an electric motor is arranged in the housing 2 between the rear end 3 of the housing 2 and the front end 4 of the housing 2. The drive motor 5 comprises a rotational axis 6, which in the embodiment corresponds to a longitudinal direction 19 of the housing 2. The drive motor 5 comprises a housing 20 which extends along the rotational axis 6 of the drive motor 5 from a first end 7 on the end side to a second end 8 on the end side of the motor housing 20. The first end 7 of the motor housing 20 faces the rear end 3 of the housing 2. The second end 8 of the drive motor 5 faces the front end 4 of the housing 2. The drive motor 5 comprises a drive shaft 23 which protrudes from the housing 2 at the second end 8 of the housing 2 in the direction of the front end 4 of the housing 2. At this end of the drive shaft 23 is arranged a drive pinion 25 which drives a drive sprocket 38 via a bevel gear 24.

As shown in fig. 2 to 4 and in fig. 6, the housing 2 includes a first suction port 11 and a second suction port 12. The suction ports 11, 12 are used to suck cooling air in order to cool the drive motor 5. The housing 2 comprises at least one discharge opening 18 for discharging the cooling air heated by the drive motor 5. In the exemplary embodiment, a plurality of outlet openings 18, in particular three outlet openings 18, are provided. Other numbers of discharge openings 18 can also be suitable. As is shown in particular in fig. 5 and 7, a fan wheel 10 is arranged on the drive shaft 5 of the drive motor 5. The fan wheel 10 is rotationally driven about the rotational axis 6 of the drive motor 5 by means of a drive shaft 23. The fan wheel 10 is configured as a radial fan wheel. The fan wheel 10 is configured in such a way that, during operation of the work implement 1, cooling air is sucked in via the fan wheel 10 through the suction openings 11, 12 and is discharged through the discharge opening 18.

As shown in fig. 6, the first suction port 11 is arranged between the rear end 3 of the housing 2 and the first end 7 of the motor housing 20 of the drive motor 5. The second suction port 12 is arranged between the front end 4 of the housing 2 and the first end 7 of the motor housing 20 of the drive motor 5. The work implement 1 comprises a first cooling air channel 13 and a second cooling air channel 14. The first cooling air passage 13 extends from the first suction port 11 up to the first end 7 of the motor housing 20. The second cooling air passage extends from the second suction port 12 up to the second end 8 of the motor housing 20. The first cooling air passage 13 and the second cooling air passage 14 are connected to each other through a bypass 15. Pressure equalization is achieved between the first cooling air channel 13 and the second cooling air channel 14 by means of a bypass 15. If one of the two suction ports 11, 12 is at least partially blocked, the cooling air from the other cooling air passage 13, 14 can be supplied to the cooling air passage 13, 14 corresponding to the blocked suction port 11, 12 through the bypass 15.

As shown in fig. 6, the motor housing 20 comprises at its first end 7 at least one first access opening 41. The motor housing 20 comprises at its second end 8 at least one second inlet opening 42. The motor housing 20 includes at least one discharge opening 43 at a peripheral side surface thereof. The outlet opening 43 of the motor housing 20 is arranged radially relative to the fan wheel 10. The outlet opening 43 is thus at the same level as the fan wheel 43 in the direction of the axis of rotation 6 of the drive motor 5.

As shown in fig. 6, a first cooling air flow 16 and a second cooling air flow 17 are generated during operation of the work apparatus 1 by the fan wheel 10 rotating about the axis of rotation 6. The first cooling air flow 16 extends from the first suction inlet 11 via the first cooling air channel 13 up to the first end 7 of the motor housing 20. Furthermore, the first cooling air flow 16 flows into the motor housing 20 through the at least one first inlet opening 41 and up to the fan wheel 10. Here, the first cooling air flow 16 absorbs the heat radiated by the drive motor 5. The second cooling air flow 17 extends from the second suction inlet 12 via the second cooling air channel 14 up to the second end 8 of the motor housing 20. The second cooling air flow 16 flows into the motor housing 20 through the at least one second inlet opening 42 and up to the fan wheel 10. The second cooling air flow 17 is here transverse to the coils of the drive motor 5. The second cooling air flow 17 absorbs the heat radiated by the drive motor 5.

As shown in fig. 6, the heated cooling air streams 16, 17 are fed out of the drive motor 5 via the fan wheel 10 radially to the axis of rotation 6 of the drive motor 5 via the outlet opening 43 of the motor housing 20. Subsequently, the heated cooling air flows 16, 17 flow out of the housing 2 from the at least one outlet opening 43 of the motor housing 20 through the outlet opening 18. Thereby, heat generated by the drive motor 5 is conducted out of the housing 2.

As shown in fig. 6, the bypass 15 extends beyond the drive motor 5. The bypass 15 extends over the entire length of the motor housing 20 measured in the direction of the rotational axis 6. Bypass 15 intersects cooling air streams 16, 17 as they flow out of discharge opening 43 of motor housing 20. The bypass 15 is configured such that the plane of rotation 31, which is braced by the fan wheel 10, is cut by the bypass 15. The rotation plane 31 is oriented perpendicular to the rotation axis 6 of the drive motor 5 and cuts the fan wheel 10. In an embodiment, the rotation plane 31 is oriented perpendicular to the longitudinal plane 46 and perpendicular to the transverse plane 47.

As shown in fig. 4, the first suction opening 11 and the second suction opening 12 are arranged offset relative to each other by an angular distance α with respect to the rotation axis 6 of the drive motor 5. The angular distance α between the suction openings 11, 12 is in the embodiment at least 15 °, preferably at least 25 °, in particular about 30 °. The angular distance α between the suction openings 11, 12 is in the embodiment at most 150 °, in particular at most 120 °, preferably at most 90 °.

As shown in fig. 2 to 3, the first suction opening 11 is arranged in the exemplary embodiment on the upper side 26 of the housing 2. The second suction opening 12 is preferably arranged on one of the two longitudinal sides 28, 29. In a preferred embodiment, the second suction opening 12 is arranged on the first longitudinal side 28, wherein the first longitudinal side 28 has a larger spacing relative to the tool plane 30 than the second longitudinal side 29. The distance of the longitudinal sides 28, 29 relative to the tool plane 30 can be measured perpendicular to the tool plane 30 at the front end 4 of the housing 2. Whereby dirt originating from the tool 9 should be reduced or avoided at the second suction opening 12.

As shown in fig. 3, the first suction opening 11 is arranged as close as possible to the rear end 3 of the housing 2 in order to maximize the spacing relative to the tool 9. Thereby also reducing or avoiding fouling from the tool 9. The spacing of the second suction port 12 relative to the tool 9 is smaller than the spacing of the first suction port 11 relative to the tool 9. In other words, the housing 2 has a total amount (Gesamtmenge) l extending from the rear end 3 up to the front end 4. The first suction port 11 has a first pitch a with respect to the front end 4 of the housing 2, and the second suction port 12 has a pitch b with respect to the front end 4 of the housing 2. The first spacing a is greater than the second spacing b. The first distance a corresponds to at least 50%, preferably at least 70%, in particular approximately 80% of the total length l of the housing 2. The second distance b corresponds to at least 25%, preferably at least 35%, in particular approximately 40% of the total length l of the housing 2.

As shown in fig. 4, the first suction port 11 has a maximum width c measured in a direction extending from the first longitudinal side 28 toward the second longitudinal side 29. The maximum width c corresponds to at least 20%, preferably at least 30%, in particular about 40% of the maximum width d of the housing 2, i.e. the maximum distance between the first and second longitudinal sides 28, 29. Furthermore, the first suction opening 11 extends over a maximum height e, wherein the height e is measured in the vertical direction 45. The maximum height e of the first suction opening 11 corresponds to at least 5% of the maximum height f of the housing 2, wherein the maximum height f of the housing 2 is also measured in the vertical direction 45.

As shown in fig. 4, the second suction opening 11 also has a maximum height g measured in the vertical direction 45, wherein the maximum height g of the second suction opening 11 corresponds to at least 10%, preferably at least 20%, in particular at least 30% of the maximum height f of the housing 2. As shown in fig. 2, the second suction opening 12 has a maximum width h measured in the longitudinal direction 19, wherein the width h of the second opening 12 corresponds to at least 5% of the total length l of the housing 2.

As shown in fig. 2 to 4, the first suction opening 11 and the second suction opening 12 are closed toward the front end 4 of the housing 2, i.e., toward the tool 9. Dirt particles can thus be avoided from reaching from the tool 9 into the suction openings 11, 12. The two suction openings 11, 12 are located in the rear cut of the housing 2 with respect to the front end 4 of the housing 2. Accordingly, the suction ports 11, 12 are arranged toward the front end 4 of the housing 2 so as to be shielded by the housing 2. Further, a first filter and a second filter, which are not shown in more detail, are provided at the suction ports 11, 12, respectively. The first filter facing the environment of the work apparatus is designed as a metal filter. The second filter covered by the first filter is preferably a foam filter. The first filter is used for filtering coarse dirt particles and the second filter is used for filtering finer dirt particles.

Claims

1. A portable working implement, which is provided with a handle,

it comprises the following steps:

a housing (2) having a rear end (3) and a front end (4),

a tool (9), wherein the tool (9) is arranged at the front end (4) of the housing (2),

a drive motor (5) with a rotational axis (6) arranged in the housing (2) between the rear end (3) and the front end (4), for driving the tool (9), wherein the drive motor (5) has a motor housing (20) with a first end (7) facing the rear end (3) of the housing (2) and a second end (8) facing the front end (4) of the housing (2),

wherein a first suction opening (11) and a second suction opening (12) for cooling air for cooling the drive motor (5) are formed at the housing (2),

-wherein the first suction opening (11) is arranged between the rear end (3) of the housing (2) and the first end (7) of the motor housing (20) of the drive motor (5),

-wherein the second suction opening (12) is arranged between the front end (4) of the housing (2) and the first end (7) of the motor housing (20) of the drive motor (5),

a first cooling air channel (13) and a second cooling air channel (14), wherein the first cooling air channel (13) extends from the first suction opening (11) up to a first end (7) of a motor housing (20) of the drive motor (5), and wherein the second cooling air channel (14) extends from the second suction opening (12) up to a second end (8) of the motor housing (20) of the drive motor (5),

-wherein the first cooling air channel (13) and the second cooling air channel (14) are connected to each other by a bypass (15).

2. The working implement according to claim 1,

characterized in that the drive motor (5) comprises a fan wheel (10) which rotates about a rotation axis (6), wherein a first cooling air flow (16) flowing along the first cooling air channel (13) and a second cooling air flow (17) flowing along the second cooling air channel (14) are generated by the fan wheel (10) during operation of the drive motor (5).

3. The working implement according to claim 2,

characterized in that at least one outlet opening (18) is provided at the housing (2) for discharging the cooling air flow (16, 17) from the housing (2).

4. The working implement according to claim 1,

characterized in that the bypass (15) extends outside the motor housing (20) of the drive motor (5).

5. The working implement according to claim 2,

characterized in that a plane of rotation (31) which is braced by the fan wheel (10) intersects the bypass (15).

6. The working implement according to claim 1,

characterized in that a first filter (21) is provided at the suction ports (11, 12).

7. The working implement according to claim 6,

characterized in that a second filter (22) is provided at the suction ports (11, 12).

8. The working implement according to claim 1,

characterized in that the first suction opening (11) and the second suction opening (12) are arranged offset relative to each other with respect to the axis of rotation (6) of the drive motor (5) by an angular distance (alpha).

9. The working implement according to claim 8,

characterized in that the angular distance (alpha) between the suction openings (11, 12) is at least 15 deg..

10. The working implement according to claim 1,

characterized in that the first suction opening (11) has a first distance (a) from the front end (4) of the housing (2), and the second suction opening (12) has a second distance (b) from the front end (4) of the housing (2), wherein the first distance (a) is greater than the second distance (b).

11. The work implement of claim 10,

characterized in that the housing (2) has an overall length (l) extending from the rear end (3) up to the front end (4).

12. The work implement of claim 11,

characterized in that the first distance (a) corresponds to at least 50% of the total length (l) of the housing (2).

13. The work implement of claim 11,

characterized in that the second distance (b) corresponds to at least 25% of the total length (l) of the housing (2).

14. The working implement according to claim 1,

characterized in that the housing (2) has an upper side (26), a lower side (27), a first longitudinal side (28) and a second longitudinal side (29), wherein the first suction opening (11) is arranged on the upper side (26) of the housing (2).

15. The work implement of claim 14,

characterized in that the second suction opening (12) is arranged on one of the two longitudinal sides (28, 29) of the housing (2).