Electric chain saw

Abstract

The utility model relates to an electric chain saw which comprises a chain saw body, a driving mechanism, an output shaft, a first-stage planetary gear mechanism, a second-stage planetary gear mechanism and a gear shifting mechanism. The first-stage planetary gear mechanism comprises a first-stage sun gear, a first-stage planetary gear and a fixed first-stage planetary gear ring, and the second-stage planetary gear mechanism comprises a second-stage sun gear, a second-stage planetary gear and a second-stage planetary gear ring. The gear shifting mechanism is connected with the second-stage planetary gear ring and used for driving the second-stage planetary gear ring to move in the axial direction of the output shaft, so that the chain saw body is provided with a low-speed high-torque gear where the first-stage planetary gear ring and the second-stage planetary gear ring are in contact fit and a high-speed low-torque gear where the first-stage planetary gear ring and the second-stage planetary gear ring are separated. Therefore, the same electric chain saw not only has a high-speed low-torque cutting state, namely, a cutting speed for cutting small trees, but also has a low-speed high-torque cutting state, namely, a cutting capability for cutting large trees.

Description

Technical Field

[0001] The present application relates to the technical field of electric cutting tools, and in particular to an electric chain saw. Background Art

[0002] An electric chain saw is a woodworking power tool that uses a rotating chain blade for sawing. It is suitable for logging in forests and selecting timber for mills. Due to the limitations of motor characteristics at the same power level, electric chain saws are designed to operate at either high speed and low torque or low speed and high torque. When the same electric chain saw is used to cut trees of different sizes, a high-speed, low-torque saw will be faster when cutting smaller trees, but will tend to jam and lose force when cutting larger trees. A low-speed, high-torque saw is less likely to jam when cutting larger trees, but will be slower when cutting smaller trees. Furthermore, the low speed setting can cause branches to be damaged when cutting saplings. Utility Model Content

[0003] Based on this, it is necessary to provide an electric chain saw that has both a high-speed, low-torque cutting state, that is, a cutting speed for cutting small trees, and a low-speed, high-torque cutting state, that is, a cutting capability for cutting large trees.

[0004] An electric chain saw comprising:

[0005] Chain saw body;

[0006] a drive mechanism having an input shaft;

[0007] an output shaft connected to the chain saw body and coaxially arranged with the input shaft;

[0008] a first-stage planetary gear mechanism, the first-stage planetary gear mechanism comprising a first-stage sun gear, a first-stage planetary gear, and a fixed first-stage planetary ring gear, the first-stage sun gear being disposed on the input shaft, the first-stage planetary gear being disposed on the outer periphery of the first-stage sun gear and meshing with the first-stage sun gear for transmission, and the first-stage planetary ring gear being sleeved on the first-stage planetary gear and meshing with the first-stage planetary gear for transmission;

[0009] A two-stage planetary gear mechanism, comprising a two-stage sun gear, two-stage planetary gears, and a two-stage planetary ring gear, wherein the two-stage sun gear rotates synchronously with the one-stage planetary gears, the two-stage planetary gears are connected to the output shaft, the two-stage planetary gears are arranged on the outer periphery of the two-stage sun gear and mesh with the two-stage sun gear for transmission, and the two-stage planetary ring gear is movably mounted on the two-stage planetary gears and meshes with the two-stage planetary gears for transmission; and

[0010] A gear shifting mechanism is connected to the secondary planetary ring gear, and is used to drive the secondary planetary ring gear to move axially along the output shaft so that the chain saw body has a low-speed, high-torque gear position in which the primary planetary ring gear is in contact with the secondary planetary ring gear, and a high-speed, low-torque gear position in which the primary planetary ring gear is separated from the secondary planetary ring gear.

[0011] In one embodiment, the first-stage planetary gear mechanism further includes a first-stage planet carrier, the first-stage planetary gear is rotatably mounted on the side of the first-stage planet carrier facing the first-stage sun gear, and the second-stage sun gear is rotatably mounted on the side of the first-stage planet carrier facing away from the first-stage sun gear.

[0012] In one embodiment, the secondary planetary gear mechanism also includes a secondary planetary carrier, which is arranged on the side of the primary planetary carrier away from the primary sun gear, and the secondary planetary carrier is connected to the output shaft, the primary planetary carrier and the secondary planetary carrier are arranged to form a first accommodating space, the secondary sun gear and the secondary planetary gear are arranged in the first accommodating space, and the secondary planetary gear is rotatably mounted on the secondary planetary carrier.

[0013] In one embodiment, an extension portion is provided on a side of the first planetary ring gear facing the second planetary ring gear, and the first planetary ring gear and the extension portion are arranged to form a second accommodating space; when the chain saw body is in the low-speed and high-torque gear position, the secondary planetary ring gear is at least partially arranged in the second accommodating space, and the secondary planetary ring gear is in contact with the first planetary ring gear and the extension portion; when the chain saw body is in the high-speed and low-torque gear position, the secondary planetary ring gear is located outside the second accommodating space.

[0014] In one embodiment, the electric chain saw further includes a planetary gearbox, the first-stage planetary gear mechanism and the second-stage planetary gear mechanism are disposed in the planetary gearbox, and the first-stage planetary ring gear is fixedly connected to the planetary gearbox.

[0015] In one embodiment, the planetary gearbox includes a first end and a second end, the first end and the second end are respectively located at the two ends of the planetary gearbox along the axial direction of the input shaft, the first end is arranged away from the chain saw body, and the second end is arranged close to the chain saw body; the first end is provided with a first through-hole, and the input shaft is at least partially provided outside the planetary gearbox through the first through-hole; the second end is provided with a second through-hole, and the output shaft is at least partially provided outside the planetary gearbox through the second through-hole.

[0016] In one embodiment, the second end portion is provided with a ring body, and the ring body is located between the second end portion and the secondary planet carrier; the electric chain saw further comprises a bearing, and the bearing is mounted on the output shaft and located in the ring body.

[0017] In one embodiment, the electric chain saw also includes a shell, and the driving mechanism, the first-stage planetary gear mechanism and the second-stage planetary gear mechanism are arranged in the shell; the shell is provided with a first strip hole, and the planetary gear box is provided with a second strip hole, and the first strip hole and the second strip hole are extended along the axial direction of the output shaft; the shifting mechanism also includes a shift member and a connecting arm, the shift member is movably provided in the first strip hole, and the connecting arm is arranged around the outer circumference of the planetary gear box, one end of the connecting arm is connected to the shift member, and the other end of the connecting arm is provided in the planetary gear box through the second strip hole and connected to the secondary planetary gear ring.

[0018] In one embodiment, there are two second strip holes and two connecting arms, and the two second strip holes are respectively arranged on opposite sides of the planetary gearbox along the axial direction of the output shaft. One end of the two connecting arms is respectively connected to the opposite sides of the shift member along the axial direction of the output shaft, and the other ends of the two connecting arms are respectively arranged in the planetary gearbox through the two second strip holes and connected to the two sides of the secondary planetary ring gear along the axial direction of the output shaft.

[0019] In one embodiment, the chain saw body includes a chain and a guide plate, and the chain is wound around an outer circumference of the guide plate.

[0020] When the electric chain saw is in use, the shift mechanism drives the secondary planetary gear ring to move axially along the output shaft, causing it to contact the primary planetary gear ring. At this point, the chain saw body is in a low-speed, high-torque gear position. In the low-speed, high-torque gear position, the input shaft of the drive mechanism rotates axially to drive the primary sun gear. The primary sun gear meshes with the primary planetary gears to drive the primary and secondary sun gears to rotate synchronously. The secondary sun gear meshes with the secondary planetary gears to drive the secondary planetary gears to rotate. The secondary planetary gears then rotate the output shaft, which in turn drives the chain saw body to cut. In the low-speed, high-torque gear position, the primary planetary gear ring contacts the secondary planetary gear ring. Since the primary planetary gear ring is stationary, the secondary planetary gear ring is also stationary. Both the primary and secondary planetary gear rings participate in the reduction gear, allowing the chain saw body to cut at a low speed and high torque. During use, the shift mechanism drives the secondary planetary gear ring to move in the opposite direction along the output shaft, causing the secondary planetary gear ring to separate from the primary planetary gear ring. At this point, the chain saw body is in a high-speed, low-torque gear position. In the high-speed, low-torque gear, the input shaft of the drive mechanism rotates axially to drive the first sun gear. The first sun gear meshes with the first planetary gears to drive the first planetary gears and the second sun gear to rotate synchronously. The second sun gear meshes with the second planetary gears to drive the second planetary gears. The second planetary gears then rotate the output shaft, thereby driving the chain saw body to cut. Simultaneously, the second planetary gears mesh with the second planetary ring gear to drive the second planetary ring gear. In the high-speed, low-torque gear, the first and second planetary ring gears separate, with only the first planetary ring gear participating in the deceleration, allowing the chain saw body to cut at a high speed and low torque. In this way, the gear shifting mechanism can be used to shift the second planetary ring gear axially along the output shaft, switching between low-speed, high-torque and high-speed, low-torque gears according to cutting requirements. This allows the electric chain saw to adjust its cutting speed and torque, enabling the same electric chain saw to achieve both a high-speed, low-torque cutting mode (capable of cutting small trees) and a low-speed, high-torque cutting mode (capable of cutting large trees). BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the structure of an electric chain saw according to an embodiment of the present application.

[0022] Figure 2 for Figure 1 Schematic diagram of the partial structure of the electric chain saw shown.

[0023] Figure 3 for Figure 2 Front view of .

[0024] Figure 4 for Figure 3 Cross-sectional view along AA.

[0025] Description of Figure Numbers:

[0026] 10. Chain saw body; 11. Guide plate; 12. Chain; 20. Drive mechanism; 21. Input shaft; 30. Output shaft; 40. Primary planetary gear mechanism; 41. Primary sun gear; 42. Primary planetary gear; 43. Primary planetary ring gear; 431. Secondary accommodating space; 432. Extension portion; 44. Primary planet carrier; 441. Disc body; 442. Neck; 50. Secondary planetary gear mechanism; 51. Secondary sun gear; 52. Secondary planetary gear; 53. Secondary planetary ring gear; 54. Secondary planet carrier; 60. Shift mechanism; 61. Shift member; 62. Connecting arm; 70. Planetary gear box; 71. First end portion; 72. Second end portion; 722. Ring body; 73. Second strip hole; 80. Bearing; 90. Housing; 91. First strip hole. DETAILED DESCRIPTION

[0027] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0028] See Figure 1 、 Figure 3 and Figure 4 An electric chain saw provided in one embodiment of the present application includes a chain saw body 10, a drive mechanism 20 having an input shaft 21, an output shaft 30, a primary planetary gear mechanism 40, a secondary planetary gear mechanism 50, and a gear shift mechanism 60. The output shaft 30 is disposed between the chain saw body 10 and the input shaft 21 and is connected to the chain saw body 10. The output shaft 30 and the input shaft 21 are coaxially arranged.

[0029] Optionally, the electric chain saw is a guide bar electric chain saw. Figure 1 The chain saw body 10 includes a guide plate 11 and a chain 12 , and the chain 12 is wound around the guide plate 11 .

[0030] See Figure 4 The first-stage planetary gear mechanism 40 includes a first-stage sun gear 41, first-stage planetary gears 42, and a fixed first-stage planetary ring gear 43. The first-stage sun gear 41 is arranged on the input shaft 21, the first-stage planetary gears 42 are arranged on the outer periphery of the first-stage sun gear 41 and mesh with the first-stage sun gear 41 for transmission, and the first-stage planetary ring gear 43 is sleeved on the first-stage planetary gears 42 and meshes with the first-stage planetary gears 42 for transmission.

[0031] See Figure 4The secondary planetary gear mechanism 50 includes a secondary sun gear 51, secondary planetary gears 52, and a secondary planetary ring gear 53. The secondary sun gear 51 rotates synchronously with the primary planetary gears 42. The secondary planetary gears 52 are provided on the output shaft 30. The secondary planetary gears 52 are provided on the outer periphery of the secondary sun gear 51 and mesh with the secondary sun gear 51 for transmission. The secondary planetary ring gear 53 is movably mounted on the secondary planetary gears 52 and meshes with the secondary planetary gears 52 for transmission.

[0032] See Figure 3 and Figure 4 The gear shifting mechanism 60 is connected to the secondary planetary ring gear 53. The gear shifting mechanism 60 is used to drive the secondary planetary ring gear 53 to move axially along the output shaft 30, so that the chain saw body 10 has a low-speed and high-torque gear position in which the primary planetary ring gear 43 and the secondary planetary ring gear 53 are in contact and matched, and a high-speed and low-torque gear position in which the primary planetary ring gear 43 and the secondary planetary ring gear 53 are separated.

[0033] When using, refer to Figure 3 and Figure 4 The shift mechanism 60 drives the secondary planetary ring gear 53 to move axially along the output shaft 30, causing the secondary planetary ring gear 53 to contact the primary planetary ring gear 43. At this point, the chain saw body 10 is in the low-speed, high-torque gear position. In the low-speed, high-torque gear position, the input shaft 21 of the drive mechanism 20 rotates axially to drive the primary sun gear 41. The primary sun gear 41 meshes with the primary planetary gears 42, driving the primary planetary gears 42 to rotate synchronously with the secondary sun gear 51. The secondary sun gear 51 meshes with the secondary planetary gears 52, driving the secondary planetary gears 52 to rotate. The secondary planetary gears 52 drive the output shaft 30 to rotate, thereby driving the chain saw body 10 to cut.

[0034] In the low-speed, high-torque gear position, the primary planetary ring gear 43 contacts the secondary planetary ring gear 53. Since the primary planetary ring gear 43 is fixed, the secondary planetary ring gear 53 is also fixed. At this time, both the primary planetary ring gear 43 and the secondary planetary ring gear 53 participate in deceleration, so that the chain saw body 10 cuts at a low-speed, high-torque state.

[0035] When using, refer to Figure 3 and Figure 4The shift mechanism 60 drives the secondary planetary gear 52 to move in the opposite direction along the axial direction of the output shaft 30, causing the secondary planetary gear ring 53 to separate from the primary planetary gear ring 43. At this time, the chain saw body 10 is in the high-speed, low-torque gear position. In the high-speed, low-torque gear position, the input shaft 21 of the drive mechanism 20 rotates about its axial direction to drive the primary sun gear 41 to rotate. The primary sun gear 41 meshes with the primary planetary gears 42 to drive the primary planetary gears 42 to rotate synchronously with the secondary sun gear 51. The secondary sun gear 51 meshes with the secondary planetary gears 52 to drive the secondary planetary gears 52 to rotate. The secondary planetary gears 52 drive the output shaft 30 to rotate, thereby driving the chain saw body 10 to cut. At the same time, the secondary planetary gears 52 mesh with the secondary planetary gear ring 53 to drive the secondary planetary gear ring 53 to rotate.

[0036] In the high low torque gear, the primary planetary ring gear 43 is separated from the secondary planetary ring gear 53 . At this time, only the primary planetary ring gear 43 participates in deceleration, so that the chain saw body 10 cuts at a high speed and low torque.

[0037] In this way, according to the cutting requirements, the gear shifting mechanism 60 can be used to drive the secondary planetary ring gear 53 to move axially along the output shaft 30 to achieve switching between low-speed, high-torque gears and high-speed, low-torque gears, thereby adjusting the cutting speed and cutting torque of the electric chain saw. This allows the same electric chain saw to have both a high-speed, low-torque cutting state, that is, the cutting speed for cutting small trees, and a low-speed, high-torque cutting state, that is, the ability to cut large trees.

[0038] In one embodiment, see Figure 4 The first-stage planetary gear mechanism 40 further includes a first-stage planet carrier 44. The first-stage planetary gears 42 are rotatably mounted on the side of the first-stage planet carrier 44 facing the first-stage sun gear 41, and the second-stage sun gear 51 is rotatably mounted on the side of the first-stage planet carrier 44 facing away from the first-stage sun gear 41. During use, the input shaft 21 of the drive mechanism 20 rotates about its own axis, thereby driving the first-stage sun gear 41 to rotate. The first-stage sun gear 41 meshes with the first-stage planetary gears 42 for transmission, thereby driving the first-stage planetary gears 42 to rotate. Since both the first-stage planetary gears 42 and the second-stage sun gear 51 are mounted on the first-stage planet carrier 44, during the rotation of the first-stage planetary gears 42, the first-stage planet carrier 44 also rotates synchronously, thereby driving the second-stage sun gear 51 to rotate.

[0039] Specifically, see Figure 4 The primary planet carrier 44 includes a disc 441 and a neck 442. The primary planet gears 42 are mounted on the side of the disc 441 facing the primary sun gear 41. The neck 442 is located on the side of the disc 441 facing away from the primary sun gear 41. The neck 442 is coaxial with the input shaft 21 and the output shaft 30. The secondary sun gear 51 is mounted on the neck 442.

[0040] In one embodiment, see Figure 4 The secondary planetary gear mechanism 50 further includes a secondary planet carrier 54. The secondary planet carrier 54 is located on a side of the primary planet carrier 44 facing away from the primary sun gear 41 and is connected to the output shaft 30. The primary planet carrier 44 and the secondary planet carrier 54 enclose a first accommodation space, and the secondary sun gear 51 and the secondary planet gears 52 are located in the first accommodation space, with the secondary planet gears 52 being rotatably mounted on the secondary planet carrier 54.

[0041] When using, refer to Figure 4 The input shaft 21 of the drive mechanism 20 rotates about its own axis, thereby driving the primary sun gear 41 to rotate. The primary sun gear 41 meshes with the primary planetary gears 42, causing the primary planetary gears 42 and the secondary sun gear 51 to rotate synchronously. The secondary sun gear 51 meshes with the secondary planetary gears 52, driving the secondary planetary gears 52 to rotate. Because the secondary planetary gears 52 are mounted on the secondary planetary carrier 54, which is connected to the output shaft 30, the secondary planetary gears 52 drive the secondary planetary carrier 54 to rotate, which in turn drives the output shaft 30 to rotate, thereby driving the chain saw body 10 to cut.

[0042] In addition, by arranging the secondary sun gear 51 and the secondary planetary gear 52 in the first accommodating space, the structure of the electric chain saw is made compact, which is conducive to reducing the volume.

[0043] In one embodiment, see Figure 4 An extension portion 432 is provided on one side of the primary planetary gear ring 43 facing the secondary planetary gear ring 53. The primary planetary gear ring 43 and the extension portion 432 enclose a second accommodating space 431. Optionally, the extension portion 432 is an extension ring.

[0044] Further, see Figure 4 When the chain saw body 10 is in the low-speed, high-torque gear position, the secondary planetary ring gear 53 is at least partially located within the second accommodating space 431, and the secondary planetary ring gear 53 abuts the primary planetary ring gear 43 and the extension 432. Thus, due to the abutment between the secondary planetary ring gear 53, the primary planetary ring gear 43, and the extension 432, the primary planetary ring gear 43 and the extension 432 block the secondary planetary ring gear 53, causing the secondary planetary gear 52 to be fixed relative to the primary planetary ring gear 43. Thus, in the low-speed, high-torque gear position, both the primary planetary ring gear 43 and the secondary planetary ring gear 53 participate in deceleration.

[0045] Furthermore, when the chain saw body 10 is in the high-speed, low-torque gear position, the secondary planetary ring gear 53 is located outside the second accommodating space 431. Since the secondary planetary ring gear 53 is located outside the second accommodating space 431, the secondary planetary gear 52 can drive the secondary planetary ring gear 53 to rotate. In this way, in the high-speed, low-torque gear position, only the primary planetary ring gear 43 participates in deceleration.

[0046] In one embodiment, see Figure 4 The electric chain saw also includes a planetary gearbox 70. The primary planetary gear mechanism 40 and the secondary planetary gear mechanism 50 are housed within the planetary gearbox 70, with the primary planetary ring gear 43 fixedly connected to the planetary gearbox 70. This provides a protective structure for the primary and secondary planetary gear mechanisms 40, 50, preventing them from being damaged by foreign matter and extending their service life. Furthermore, the planetary gearbox 70 provides a mounting location for the primary planetary ring gear 43, securing it relative to the planetary gearbox 70.

[0047] Further, see Figure 4 The planetary gearbox 70 includes a first end 71 and a second end 72. The first end 71 and the second end 72 are located at opposite ends of the planetary gearbox 70 along the axial direction of the input shaft 21. The first end 71 is located away from the chain saw body 10, and the second end 72 is located closer to the chain saw body 10. The first end 71 defines a first through-hole, through which at least a portion of the input shaft 21 is disposed outside the planetary gearbox 70. The second end 72 defines a second through-hole, through which at least a portion of the output shaft 30 is disposed outside the planetary gearbox 70.

[0048] Because one end of the input shaft 21 is located within the planetary gearbox 70, it provides a mounting location for the primary sun gear 41. The other end of the input shaft 21 is located outside the planetary gearbox 70 through a first through-hole, allowing the main body of the drive mechanism 20 to be located outside the planetary gearbox 70. This separates the main body of the drive mechanism 20 from the primary planetary gear mechanism 40 and the secondary planetary gear mechanism 50, preventing motion interference.

[0049] Since one end of the output shaft 30 is located in the planetary gearbox 70, the output shaft 30 can provide a mounting position for the secondary planet carrier 54. The other end of the output shaft 30 is disposed outside the planetary gearbox 70 through a second through-hole, so that the output shaft 30 outside the planetary gearbox 70 is connected to the chain saw body 10.

[0050] In one embodiment, see Figure 4The second end portion 72 is provided with a ring body 722, which is located between the second end portion 72 and the secondary planet carrier 54. The electric chain saw further includes a bearing 80, which is mounted on the output shaft 30 and located within the ring body 722. Thus, by providing the ring body 722 at the second end portion 72, the output shaft 30 is connected and mated with the ring body 722 via the bearing 80. The mating of the ring body 722 and the bearing 80 can improve the load-bearing capacity of the output shaft 30 and reduce wear on the bearing 80.

[0051] In one embodiment, see Figure 1 and Figure 2 The electric chain saw further includes a housing 90, and the drive mechanism 20, the primary planetary gear mechanism 40, and the secondary planetary gear mechanism 50 are disposed within the housing 90. By providing the housing 90, the drive mechanism 20, the primary planetary gear mechanism 40, and the secondary planetary gear mechanism 50 are disposed within the housing 90, so that the housing 90 can serve as a protective function, preventing damage to the drive mechanism 20, the primary planetary gear mechanism 40, and the secondary planetary gear mechanism 50, thereby extending their service life.

[0052] Further, see Figure 1 、 Figure 2 and Figure 4 The housing 90 is provided with a first strip hole 91, and the planetary gearbox 70 is provided with a second strip hole 73. The first strip hole 91 and the second strip hole 73 are extended along the axial direction of the output shaft 30. The shifting mechanism 60 also includes a shifting member 61 and a connecting arm 62. The shifting member 61 is movably provided in the first strip hole 91. The connecting arm 62 is arranged around the outer circumference of the planetary gearbox 70. One end of the connecting arm 62 is connected to the shifting member 61, and the other end of the connecting arm 62 is provided in the planetary gearbox 70 through the second strip hole 73 and connected to the secondary planetary ring gear 53. When in use, an external force acts on the shifting member 61, and the shifting member 61 moves in the first strip hole 91, thereby driving the connecting arm 62 to move in the second strip hole 73, thereby driving the secondary planetary ring gear 53 to move along the axial direction of the output shaft 30. In this way, by setting the first strip hole 91 and the second strip hole 73 extending axially along the output shaft 30, the first strip hole 91 and the second strip hole 73 play a role of avoidance, so that the shift member 61 drives the secondary planetary ring gear 53 to move axially along the output shaft 30 through the connecting arm 62, thereby realizing the switching between low-speed high-torque gear and high-speed low-torque gear.

[0053] In this embodiment, two second strip-shaped holes 73 and two connecting arms 62 are provided, and the two second strip-shaped holes 73 are arranged opposite each other. One end of each connecting arm 62 is connected to the shift member 61 on either side of the output shaft 30 axially. The other end of each connecting arm 62 is respectively disposed within the planetary gearbox 70 through the two second strip-shaped holes 73 and connected to the secondary planetary ring gear on either side of the output shaft 30 axially.

[0054] The connection methods between the connecting arms 62 and the secondary planetary ring gear 53 include, but are not limited to, abutment, clamping, threaded connection, hook connection, etc. With this arrangement, the shift member 61 drives the secondary planetary ring gear 53 to move axially along the output shaft 30 via the two connecting arms 62, which helps to improve the stability and smoothness of the movement of the secondary planetary ring gear 53.

[0055] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0056] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0057] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0058] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0059] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0060] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0061] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. An electric chain saw, characterized in that: include: Chain saw body; a drive mechanism having an input shaft; An output shaft, the output shaft is connected to the chain saw body, and the output shaft is coaxially arranged with the input shaft; A first-stage planetary gear mechanism, the first-stage planetary gear mechanism comprising a first-stage sun gear, a first-stage planetary gear and a fixed first-stage planetary gear ring, the first-stage sun gear is arranged on the input shaft, the first-stage planetary gear is arranged on the outer periphery of the first-stage sun gear and meshes with the first-stage sun gear for transmission, and the first-stage planetary gear ring is sleeved on the first-stage planetary gear and meshes with the first-stage planetary gear for transmission; A two-stage planetary gear mechanism, the two-stage planetary gear mechanism comprises a two-stage sun gear, a two-stage planetary gear and a two-stage planetary gear ring, the two-stage sun gear rotates synchronously with the one-stage planetary gear, the two-stage planetary gear is connected to the output shaft, the two-stage planetary gear is arranged on the outer periphery of the two-stage sun gear and meshes with the two-stage sun gear for transmission, the two-stage planetary gear ring is movably sleeved on the two-stage planetary gear and meshes with the two-stage planetary gear for transmission; and, A gear shifting mechanism is connected to the secondary planetary gear ring, and is used to drive the secondary planetary gear ring to move axially along the output shaft, so that the chain saw body has a low-speed and high-torque gear position in which the primary planetary gear ring is in contact with the secondary planetary gear ring, and a high-speed and low-torque gear position in which the primary planetary gear ring is separated from the secondary planetary gear ring.

2. The electric chain saw according to claim 1, characterized in that: The first-stage planetary gear mechanism also includes a first-stage planet carrier, the first-stage planetary gear is rotatably mounted on a side of the first-stage planet carrier facing the first-stage sun gear, and the second-stage sun gear is rotatably mounted on a side of the first-stage planet carrier facing away from the first-stage sun gear.

3. The electric chain saw according to claim 2, characterized in that: The secondary planetary gear mechanism also includes a secondary planet carrier, which is arranged on the side of the primary planet carrier away from the primary sun gear, and the secondary planet carrier is connected to the output shaft, the primary planet carrier and the secondary planet carrier are arranged to form a first accommodating space, the secondary sun gear and the secondary planetary gear are arranged in the first accommodating space, and the secondary planetary gear is rotatably mounted on the secondary planet carrier.

4. The electric chain saw according to claim 3, characterized in that: The electric chain saw also includes a planetary gear box, the primary planetary gear mechanism and the secondary planetary gear mechanism are arranged in the planetary gear box, and the primary planetary gear ring is fixedly connected to the planetary gear box.

5. The electric chain saw according to claim 4, characterized in that: The planetary gearbox comprises a first end and a second end, the first end and the second end are respectively located at two ends of the planetary gearbox along the axial direction of the input shaft, the first end is arranged away from the chain saw body, and the second end is arranged close to the chain saw body; The first end is provided with a first through hole, and the input shaft is at least partially arranged outside the planetary gearbox through the first through hole; the second end is provided with a second through hole, and the output shaft is at least partially arranged outside the planetary gearbox through the second through hole.

6. The electric chain saw according to claim 5, characterized in that: The second end portion is provided with a ring body, and the ring body is located between the second end portion and the secondary planet carrier; the electric chain saw also includes a bearing, and the bearing is installed on the output shaft and is located in the ring body.

7. The electric chain saw according to claim 4, characterized in that: The electric chain saw further comprises a housing, wherein the driving mechanism, the primary planetary gear mechanism and the secondary planetary gear mechanism are arranged in the housing; The shell is provided with a first strip hole, and the planetary gear box is provided with a second strip hole, and the first strip hole and the second strip hole are extended along the axial direction of the output shaft; the shifting mechanism also includes a shifter and a connecting arm, the shifter is movably arranged in the first strip hole, and the connecting arm is arranged around the outer circumference of the planetary gear box, one end of the connecting arm is connected to the shifter, and the other end of the connecting arm is arranged in the planetary gear box through the second strip hole and connected to the secondary planetary gear ring.

8. The electric chain saw according to claim 7, characterized in that: There are two second strip holes and two connecting arms, and the two second strip holes are respectively arranged on opposite sides of the planetary gear box along the axial direction of the output shaft, one end of the two connecting arms is respectively connected to opposite sides of the shift member, and the other ends of the two connecting arms are respectively arranged in the planetary gear box through the two second strip holes and connected to the two sides of the secondary planetary gear ring along the axial direction of the output shaft.

9. The electric chain saw according to any one of claims 1 to 8, characterized in that: An extension portion is provided on one side of the primary planetary gear ring facing the secondary planetary gear ring, and the primary planetary gear ring and the extension portion are surrounded to form a second accommodating space; When the chain saw body is in the low-speed high-torque gear position, the secondary planetary gear ring is at least partially disposed in the second accommodating space, and the secondary planetary gear ring abuts against the primary planetary gear ring and the extension portion; When the chain saw body is in the high-speed and low-torque gear position, the secondary planetary ring gear is located outside the second accommodating space.

10. The electric chain saw according to any one of claims 1 to 8, characterized in that: The chain saw body comprises a chain and a guide plate, wherein the chain is wound around the outer peripheral surface of the guide plate.

Images