Work machine

Abstract

The invention provides a work machine. A working machine is provided with a prime mover, a power transmission unit, a working unit, and a housing. The power transmission unit includes a first planetary gear mechanism, a bevel gear, a first bearing, and a second bearing. The bevel gear includes a gear portion and a shaft portion. The first planetary gear mechanism is provided with: a first carrier that is rotatable integrally with the shaft part; a first planetary gear rotatably supported by the first carrier; a first internal gear disposed on the outside of the first planetary gear; and a first sun gear disposed on the inner side of the first planetary gear. The first bearing is directly or indirectly supported by the housing and rotatably supports the shaft portion. The second bearing is directly or indirectly supported by the housing and rotatably supports the first carrier.

Description

Technical Field

[0001] The technology disclosed in this specification relates to a working machine. Background Art

[0002] The specification of Chinese Utility Model No. 209954711 discloses a working machine. The working machine includes: a prime mover; a power transmission unit connected to the prime mover; a working unit connected to the power transmission unit; and a housing that accommodates the prime mover and the power transmission unit. The power transmission unit includes a first planetary gear mechanism, a bevel gear, a first bearing, and a second bearing. The bevel gear includes a gear portion connected to the working unit and a shaft portion that can rotate integrally with the gear portion. The first planetary gear mechanism includes: a first carrier fixed to the shaft portion; a first planetary gear rotatably supported on the first carrier; a first internal gear arranged on the outside of the first planetary gear in a manner that meshes with the first planetary gear; and a first sun gear arranged on the inside of the first planetary gear in a manner that meshes with the first planetary gear. The first bearing is directly or indirectly supported by the housing to rotatably support the shaft portion. The second bearing is directly or indirectly supported by the housing to rotatably support the shaft. Summary of the Invention

[0003] Problems to be solved by the invention

[0004] In the aforementioned working machine, the reaction force exerted by the working unit from the work object causes a force in a predetermined direction to act on the gear portion of the bevel gear. This causes the shaft portion of the bevel gear to tilt in a direction opposite to the predetermined direction, with the first and second bearings serving as fulcrums. Consequently, the first carrier shifts perpendicularly to the axis of rotation, causing the first planetary gear to come into one-sided contact with the first sun gear and the first internal gear. This specification provides a technique for suppressing one-sided contact between the first planetary gear, the first sun gear, and the first internal gear.

[0005] Solutions for solving problems

[0006] Alternatively, the working machine disclosed in this specification may include: a prime mover; a power transmission unit connected to the prime mover; a working unit connected to the power transmission unit; and a housing that houses the power transmission unit. Alternatively, the power transmission unit may include: a first planetary gear mechanism; a bevel gear; a first bearing; and a second bearing. Alternatively, the bevel gear may include: a gear portion connected to the working unit; and a shaft portion rotatable integrally with the gear portion. Alternatively, the first planetary gear mechanism may include: a first carrier rotatable integrally with the shaft portion; a first planetary gear rotatably supported on the first carrier; a first internal gear disposed outside the first planetary gear so as to mesh with the first planetary gear; and a first sun gear disposed inside the first planetary gear so as to mesh with the first planetary gear. Alternatively, the first bearing may be directly or indirectly supported by the housing, or the shaft portion may be rotatably supported. The second bearing may be directly or indirectly supported by the housing, and may rotatably support the first carrier.

[0007] In the above-described structure, displacement of the first carrier in a direction perpendicular to the rotation axis is restricted by the second bearing. Therefore, even when the working unit experiences a reaction force from an object acting on the bevel gear's gear portion in a predetermined direction, the bevel gear's shaft is prevented from tilting in a direction opposite to the predetermined direction, with the first bearing serving as a fulcrum. This structure prevents the first planetary gear from unilaterally contacting the first sun gear or the first internal gear. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a perspective view of the working machine 2 according to the embodiment.

[0009] Figure 2 This is a side view of the internal structure of the rear portion of the working machine 2 according to the embodiment as viewed from the right.

[0010] Figure 3 This is a cross-sectional view of the vicinity of the power transmission unit 36 ​​of the working machine 2 of the embodiment as viewed from above.

[0011] Figure 4 This is a side view of the internal structure of the front portion of the working machine 2 according to the embodiment as viewed from the right.

[0012] Figure 5 This is a cross-sectional view of the vicinity of the power transmission unit 36 ​​of the working machine 2 according to the comparative example, as viewed from above. DETAILED DESCRIPTION

[0013] Representative and non-limiting examples of the present invention are described in detail below with reference to the accompanying drawings. This detailed description is intended only to provide those skilled in the art with details of preferred embodiments for implementing the present invention and is not intended to limit the scope of the present invention. Furthermore, the disclosed additional features and technical solutions can be used separately or in conjunction with other features and inventions to provide further improved work machines.

[0014] In addition, the combinations of features and steps disclosed in the following detailed description are not necessarily required to practice the present invention in the broadest sense, but are provided solely to specifically illustrate representative embodiments of the present invention. Furthermore, to provide additional and useful embodiments of the present invention, the various features of the following representative embodiments and the various features described in the claims do not necessarily need to be combined in the specific examples or in the order in which they are presented.

[0015] All features described in this specification and / or claims, other than the features described in the examples and / or claims, are intended to be disclosed individually and independently of each other as limitations of the original disclosure and the specific matters described in the claims. Furthermore, all numerical ranges and descriptions involving groups or clusters are intended to disclose intermediate structures thereof as limitations of the original disclosure and the specific matters described in the claims.

[0016] In one or more embodiments, the working machine may include: a prime mover; a power transmission unit connected to the prime mover; a working unit connected to the power transmission unit; and a housing that houses the power transmission unit. The power transmission unit may include: a first planetary gear mechanism; a bevel gear; a first bearing; and a second bearing. The bevel gear may include: a gear unit connected to the working unit; and a shaft unit rotatable with the gear unit. The first planetary gear mechanism may include: a first carrier rotatable with the shaft unit; a first planetary gear rotatably supported on the first carrier; a first internal gear disposed outside the first planetary gear so as to mesh with the first planetary gear; and a first sun gear disposed inside the first planetary gear so as to mesh with the first planetary gear. The first bearing may be directly or indirectly supported by the housing, or the shaft unit may be rotatably supported. The second bearing may be directly or indirectly supported by the housing, and may rotatably support the first carrier.

[0017] In one or more embodiments, the first internal gear may be fixed to the housing.

[0018] According to the above configuration, the first planetary gear mechanism can function as a speed reduction mechanism having a large speed reduction ratio.

[0019] In one or more embodiments, the first planetary gear mechanism may further include a sleeve formed integrally with the first internal gear. The second bearing may be directly supported by the sleeve.

[0020] According to the above configuration, the support structure of the second bearing can be simplified.

[0021] In one or more embodiments, the sleeve may be in contact with the first bearing in the direction of the central axis of the first bearing.

[0022] According to the above configuration, the sleeve formed integrally with the first internal gear can function as a fall-off prevention portion of the first bearing, thereby simplifying the support structure of the first bearing.

[0023] In one or more embodiments, the power transmission unit may further include a second planetary gear mechanism. The second planetary gear mechanism may include: a second carrier rotatable integrally with the first sun gear; second planetary gears rotatably supported on the second carrier; a second internal gear disposed outside the second planetary gears so as to mesh with the second planetary gears; and a second sun gear disposed inside the second planetary gears so as to mesh with the second planetary gears.

[0024] According to the above configuration, the rotation can be decelerated by each of the first planetary gear mechanism and the second planetary gear mechanism.

[0025] In one or more embodiments, the second internal gear may be independent of the first internal gear.

[0026] The first and second planetary gear mechanisms differ in input rotational speed, torque, and reduction ratio to be achieved. Consequently, the required strength and rigidity of the first and second internal gears differ. With the above-described structure, the first and second internal gears are independent, allowing them to be constructed of materials and have dimensions appropriate to their respective required strength and rigidity.

[0027] In one or more embodiments, the working unit may include a first blade and a second blade movable between an open position and a closed position relative to the first blade. The working machine may function as a handheld pruning shears.

[0028] According to the above configuration, in the working machine functioning as pruning shears, it is possible to suppress one-sided contact between the first planetary gear, the first sun gear, and the first internal gear.

[0029] In one or more embodiments, the prime mover may include an electric motor.

[0030] According to the above configuration, in the working machine that drives the working portion by the electric motor, it is possible to suppress the first planetary gear from making one-sided contact with the first sun gear and the first internal gear.

[0031] (Example)

[0032] Figure 1 The illustrated work machine 2 is a pair of pruning shears used primarily for cutting branches, etc. The work machine 2 is an electric work machine that operates using power supplied from an external power source (not shown) via a power connector 4. A user can carry the work machine 2 by holding it with one hand.

[0033] The work machine 2 includes a housing 6, a work unit 8 that performs cutting operations, an operating unit 10 that can be operated by the user, and a display unit 12 for displaying various information to the user. The work unit 8 includes a fixed blade 14 and a movable blade 16 that can rotate relative to the fixed blade 14. The operating unit 10 includes a trigger lever 18, a power switch 20, and an open position adjustment switch 22. The work machine 2 rotates the movable blade 16 relative to the fixed blade 14 by pulling up the trigger lever 18. The housing 6 also includes a grip 24 that the user can grip with one hand, a front storage unit 26 located forward of the grip 24, a rear storage unit 28 located rearward of the grip 24, and a protective unit 30 for protecting the user's fingers when operating the trigger lever 18. The trigger lever 18 and the protective unit 30 are located below the front storage unit 26.

[0034] In addition, in this specification, the longitudinal direction of the gripping portion 24 is defined as the front-to-back direction. In the front-to-back direction, the direction from the gripping portion 24 toward the working portion 8 is defined as the front direction, and the direction opposite to the front direction is defined as the rear direction. Furthermore, the direction perpendicular to the front-to-back direction and along the rotation axis Rx of the movable blade 16 is defined as the left-to-right direction. In the left-to-right direction, the direction from the movable blade 16 toward the fixed blade 14 is defined as the left direction, and the direction opposite to the left direction is defined as the right direction. Furthermore, the direction perpendicular to the front-to-back direction and the left-to-right direction is defined as the up-down direction. In the up-down direction, the direction from the protective portion 30 toward the trigger lever 18 is defined as the upper direction, and the direction opposite to the upper direction is defined as the lower direction.

[0035] The power switch 20 and the open position adjustment switch 22 are located on the upper surface of the rear storage section 28. The power switch 20 is used to switch the main power supply of the work machine 2 on and off. The open position adjustment switch 22 is used to adjust the open position of the movable blade 16. Furthermore, the display unit 12 is located on the upper surface of the front storage section 26. The display unit 12 includes an LED (not shown) for displaying, for example, the on / off status of the main power supply.

[0036] The working machine 2 further includes a control device 32 (see Figure 2 )、Electric motor 34 (refer to Figure 2 ), and the power transmission unit 36 ​​(refer to Figure 3 ).

[0037] like Figure 2 As shown, the control device 32 is stored in the interior of the rear storage portion 28. The control device 32 is connected to the power connector 4, the operation unit 10, and the display unit 12 (see FIG. Figure 1 ) and the electric motor 34. The control device 32 includes a power supply circuit (not shown) for regulating the power supplied via the power supply connector 4; and a control circuit (not shown) for controlling the operation of the operation unit 10, the display unit 12, and the electric motor 34. The power supplied from the external power supply via the power supply connector 4 is regulated by the power supply circuit of the control device 32 and then supplied to the operation unit 10, the display unit 12, and the electric motor 34.

[0038] The electric motor 34 is, for example, a brushless DC motor, and is, for example, a coreless motor. The electric motor 34 is housed inside the grip 24. The output shaft 38 of the electric motor 34 (see Figure 3 ) extends along the front-to-back direction.

[0039] like Figure 3 As shown, the power transmission unit 36 ​​is housed within the front housing portion 26. The power transmission unit 36 ​​includes a gear plate 40, a gear housing 42, a bevel gear 44, a first planetary gear mechanism 46, a second planetary gear mechanism 48, a third planetary gear mechanism 50, a first bearing 52, and a second bearing 54. The gear housing 42 is fixed to the front housing portion 26. The bevel gear 44 is housed within the gear housing 42. The bevel gear 44 includes a gear portion 56 and a shaft portion 58. The gear portion 56 and the shaft portion 58 are seamlessly integrated.

[0040] like Figure 4 As shown, an opening 42a is formed on the right surface of the gear housing 42. The gear portion 56 of the bevel gear 44 is connected to the gear portion 40a formed on the left surface of the gear plate 40 (see Figure 3) meshes with the movable blade 16. The gear piece 40 is fixed to the movable blade 16, and the gear piece 40 and the movable blade 16 rotate integrally about the rotation axis Rx. Therefore, if the bevel gear 44 rotates clockwise when viewed from the front, the gear piece 40 and the movable blade 16 rotate clockwise when viewed from the right (i.e., in the direction of closing the movable blade 16). Conversely, if the bevel gear 44 rotates counterclockwise when viewed from the front, the gear piece 40 and the movable blade 16 rotate counterclockwise when viewed from the right (i.e., in the direction of opening the movable blade 16).

[0041] like Figure 3 As shown, a first bearing mounting portion 42b is formed on the gear housing 42. A first bearing 52 is mounted on the first bearing mounting portion 42b with its central axis extending along the front-rear direction. A shaft portion 58 of the bevel gear 44 is rotatably supported by the first bearing 52.

[0042] The first planetary gear mechanism 46 includes a first carrier 60, first planetary gears 62, a first sun gear 64, a first internal gear 66, and a cylindrical sleeve 68. The shaft portion 58 of the bevel gear 44 engages with an engagement hole 60a formed in the first carrier 60 at a position rearward of the first bearing 52, so that the bevel gear 44 and the first carrier 60 rotate integrally. The first carrier 60 rotatably supports the first planetary gears 62 via pins 60b. The first internal gear 66 is arranged outside the first planetary gears 62 and meshes with them. The first sun gear 64 is arranged inside the first planetary gears 62 and meshes with them. The first planetary gear mechanism 46 functions as a speed reduction mechanism that reduces the rotation of the first sun gear 64 and transmits it to the first carrier 60.

[0043] The cylindrical sleeve 68 is arranged in front of the first internal gear 66. The cylindrical sleeve 68 is seamlessly integrated with the first internal gear 66. The second bearing 54 is mounted on the cylindrical sleeve 68 with its central axis extending in the front-to-back direction. The first carrier 60 is rotatably supported on the second bearing 54. The gear housing 42 includes a cylindrical sleeve mounting portion 42c having internal threads on its inner circumferential surface. The outer circumferential surface of the cylindrical sleeve 68 includes external threads corresponding to the internal threads of the cylindrical sleeve mounting portion 42c. The cylindrical sleeve 68 is fixed to the gear housing 42 by threading into the cylindrical sleeve mounting portion 42c. When the cylindrical sleeve 68 is fixed to the gear housing 42, the front end of the cylindrical sleeve 68 abuts the rear end of the first bearing 52. Therefore, the cylindrical sleeve 68 functions as a fall-off prevention portion that prevents the first bearing 52 from falling off the gear housing 42.

[0044] The second planetary gear mechanism 48 includes a second carrier 70, second planetary gears 72, a second sun gear 74, and a second internal gear 76. The second carrier 70 is seamlessly integrated with the first sun gear 64 and rotates integrally with the first sun gear 64. The second carrier 70 rotatably supports the second planetary gears 72 via pins 70a. The second internal gear 76 is arranged outside the second planetary gears 72 and meshes with them. The second sun gear 74 is arranged inside the second planetary gears 72 and meshes with them. The second planetary gear mechanism 48 functions as a speed reduction mechanism that reduces the rotation of the second sun gear 74 and transmits it to the second carrier 70.

[0045] The third planetary gear mechanism 50 includes a third carrier 80, third planetary gears 82, a third sun gear 84, and a third internal gear 86. The third carrier 80 is seamlessly and integrally formed with the second sun gear 74, and rotates integrally with the second sun gear 74. The third carrier 80 rotatably supports the third planetary gears 82 via pins 80a. The third internal gear 86 is positioned outside the third planetary gears 82 and meshes with them. The third sun gear 84 is positioned inside the third planetary gears 82 and meshes with them. The third planetary gear mechanism 50 functions as a speed reduction mechanism that reduces the rotation of the third sun gear 84 and transmits it to the third carrier 80. Furthermore, the second and third internal gears 76, 86 are seamlessly and integrally formed. The second and third internal gears 76, 86 are fixed to the first internal gear 66 and the front housing 26.

[0046] The output shaft 38 of the electric motor 34 is engaged with the engagement groove 84a formed in the third sun gear 84, and the output shaft 38 rotates integrally with the third sun gear 84. Therefore, when the electric motor 34 is driven, the rotation of the output shaft 38 is reduced in the third planetary gear mechanism 50, the second planetary gear mechanism 48, and the first planetary gear mechanism 46, respectively, and is transmitted to the bevel gear 44, and then transmitted to the movable blade 16 via the gear plate 40.

[0047] When the working machine 2 performs a cutting operation, the movable blade 16 receives a reaction force from the object to be cut, which acts to press the gear piece 40 against the gear portion 56 of the bevel gear 44, and a leftward force acts on the gear portion 56 of the bevel gear 44. Figure 5 As shown, assuming that the second bearing 54 that rotatably supports the first carrier 60 is not present, when a leftward force acts on the gear portion 56 of the bevel gear 44, the portion of the shaft portion 58 of the bevel gear 44 that is rearward of the first bearing 52 tilts rightward. In this case, the first carrier 60 may shift rightward, causing the first planetary gear 62 to come into one-sided contact with the first sun gear 64 and the first internal gear 66.

[0048] In contrast, Figure 3 As shown, the working machine 2 of this embodiment includes a second bearing 54 that rotatably supports the first carrier 60. Therefore, even if a leftward force acts on the gear portion 56 of the bevel gear 44, rightward displacement of the first carrier 60 is restricted by the second bearing 54. Therefore, the portion of the shaft portion 58 of the bevel gear 44 located rearward of the first bearing 52 does not tilt rightward. Consequently, one-sided contact between the first planetary gear 62, the first sun gear 64, and the first internal gear 66 can be prevented.

[0049] (Variation)

[0050] In the above embodiment, the working machine 2 is described as a pruning shears, and the working unit 8 includes a fixed blade 14 and a movable blade 16. However, the working machine 2 may be another type of working machine, and the working unit 8 may be another type of working unit. For example, the working machine 2 may be a cutter, a rivet gun, or a grinder.

[0051] The working machine 2 may include a battery pack mounting portion (not shown) to which a rechargeable battery pack (not shown) can be attached and detached, instead of the power supply connector 4 .

[0052] The electric motor 34 may also be replaced with a motor of a different type (eg, a brush motor or a core motor).

[0053] (Features of the embodiment)

[0054] As described above, in one or more embodiments, the working machine 2 includes an electric motor 34 (an example of a prime mover), a power transmission unit 36 ​​coupled to the electric motor 34, a working unit 8 coupled to the power transmission unit 36, and a housing 6 housing the power transmission unit 36. The power transmission unit 36 ​​includes a first planetary gear mechanism 46, a bevel gear 44, a first bearing 52, and a second bearing 54. The bevel gear 44 includes a gear portion 56 coupled to the working unit 8 and a shaft portion 58 rotatable integrally with the gear portion 56. The first planetary gear mechanism 46 includes a first carrier 60 rotatable integrally with the shaft portion 58, first planetary gears 62 rotatably supported by the first carrier 60, a first internal gear 66 disposed outside the first planetary gears 62 so as to mesh with the first planetary gears 62, and a first sun gear 64 disposed inside the first planetary gears 62 so as to mesh with the first planetary gears 62. The first bearing 52 is directly or indirectly supported by the housing 6 to rotatably support the shaft portion 58. The second bearing 54 is directly or indirectly supported by the housing 6 to rotatably support the first carrier 60.

[0055] In the above-described structure, displacement of the first carrier 60 in a direction perpendicular to the axis of rotation is restricted by the second bearing 54. Therefore, even when a force in a predetermined direction acts on the gear portion 56 of the bevel gear 44 due to a reaction force received by the working unit 8 from the work object, the shaft portion 58 of the bevel gear 44 is prevented from tilting in a direction opposite to the predetermined direction with the first bearing 52 serving as a fulcrum. This structure prevents the first planetary gears 62 from unilaterally contacting the first sun gear 64 and the first internal gear 66.

[0056] In one or more embodiments, the first internal gear 66 is fixed to the housing 6 .

[0057] According to the above-described configuration, the first planetary gear mechanism 46 can function as a speed reduction mechanism having a large speed reduction ratio.

[0058] In one or more embodiments, the first planetary gear mechanism 46 further includes a cylindrical sleeve 68 (an example of a sleeve) formed integrally with the first internal gear 66 . The second bearing 54 is directly supported by the cylindrical sleeve 68 .

[0059] According to the above configuration, the support structure of the second bearing 54 can be simplified.

[0060] In one or more embodiments, the cylindrical sleeve 68 abuts against the first bearing 52 in the direction of the central axis of the first bearing 52 .

[0061] According to the above configuration, the cylindrical sleeve 68 formed integrally with the first internal gear 66 can function as a fall-off preventing portion of the first bearing 52. The support structure of the first bearing 52 can be simplified.

[0062] In one or more embodiments, the power transmission unit 36 ​​further includes a second planetary gear mechanism 48. The second planetary gear mechanism 48 includes a second carrier 70 that is rotatable integrally with the first sun gear 64; second planetary gears 72 that are rotatably supported on the second carrier 70; a second internal gear 76 that is disposed outside the second planetary gears 72 so as to mesh with the second planetary gears 72; and a second sun gear 74 that is disposed inside the second planetary gears 72 so as to mesh with the second planetary gears 72.

[0063] According to the above-described configuration, the rotation can be decelerated by each of the first planetary gear mechanism 46 and the second planetary gear mechanism 48 .

[0064] In one or more embodiments, the second internal gear 76 is independent of the first internal gear 66 .

[0065] The first planetary gear mechanism 46 and the second planetary gear mechanism 48 have different input rotational speeds, torques, reduction ratios to be achieved, and the like. Consequently, different strengths and rigidities are required for the first internal gear 66 and the second internal gear 76. Due to the above-described structure, the first internal gear 66 and the second internal gear 76 are independent of each other, allowing them to be made of materials and have dimensions appropriate to their respective required strengths and rigidities.

[0066] In one or more embodiments, the working unit 8 includes a stationary blade 14 (an example of a first blade) and a movable blade 16 (an example of a second blade) movable between an open position and a closed position relative to the stationary blade 14. The working machine 2 functions as a handheld pruning shears.

[0067] According to the above-described configuration, in the working machine 2 functioning as pruning shears, it is possible to suppress one-sided contact between the first planetary gear 62 and the first sun gear 64 or the first internal gear 66 .

[0068] In one or more embodiments, the prime mover of the work machine 2 is an electric motor 34 .

[0069] According to the above-described configuration, in the working machine 2 that drives the working unit 8 by the electric motor 34 , it is possible to suppress one-sided contact between the first planetary gear 62 and the first sun gear 64 or the first internal gear 66 .

Claims

1. A working machine, wherein: The operating machine has: prime mover; a power transmission unit connected to the prime mover; a working unit connected to the power transmission unit; and a housing accommodating the power transmission unit, The power transmission unit includes: 1st planetary gear mechanism; Bevel gears; first bearing; and No. 2 bearing, The bevel gear has: a gear portion connected to the working portion; and a shaft portion capable of rotating integrally with the gear portion, The first planetary gear mechanism includes: a first carrier capable of rotating integrally with the shaft; a first planetary gear rotatably supported on the first carrier; a first internal gear disposed outside the first planetary gear so as to mesh with the first planetary gear; as well as a first sun gear disposed inside the first planetary gear so as to mesh with the first planetary gear; The first bearing is directly or indirectly supported by the housing to rotatably support the shaft. The second bearing is directly or indirectly supported by the housing, and rotatably supports the first carrier.

2. The working machine according to claim 1, wherein: The first internal gear is fixed to the housing.

3. The working machine according to claim 1 or 2, wherein: The first planetary gear mechanism further includes a sleeve formed integrally with the first internal gear. The second bearing is directly supported by the sleeve.

4. The working machine according to claim 3, wherein: The sleeve abuts against the first bearing in the direction of the central axis of the first bearing.

5. The working machine according to any one of claims 1 to 4, wherein The power transmission unit further includes a second planetary gear mechanism. The second planetary gear mechanism includes: a second carrier capable of rotating integrally with the first sun gear; a second planetary gear rotatably supported on the second carrier; a second internal gear disposed outside the second planetary gear so as to mesh with the second planetary gear; as well as The second sun gear is arranged inside the second planetary gears so as to mesh with the second planetary gears.

6. The working machine according to claim 5, wherein: The second internal gear is independent of the first internal gear.

7. The working machine according to any one of claims 1 to 6, wherein: The working portion includes: a first blade; and a second blade that is movable between an open position and a closed position relative to the first blade. The working machine functions as a handheld pruning shears.

8. The working machine according to any one of claims 1 to 7, wherein: The prime mover includes an electric motor.

Images