Power transmission system and electric chain saw

Abstract

The utility model discloses a power transmission system and an electric chain saw. The power transmission system comprises a gearbox, a driving mechanism, a stop pin and a fixing assembly. The stop pin is sequentially arranged in the gear box and the driving mechanism in a penetrating manner; the fixing assembly is connected with the driving mechanism and the gearbox. The assembly process is simplified, the assembly precision is improved, the stability is improved, meanwhile, the production cost is reduced, and daily maintenance and after-sales repair are facilitated.

Description

Technical Field

[0001] This application belongs to the field of power tool technology, specifically relating to a power transmission system and an electric chainsaw. Background Technology

[0002] An electric chainsaw is a chainsaw tool powered by electricity, widely used in wood cutting, garden trimming, and other fields. Existing electric chainsaw power transmission systems cannot ensure the relative fixation of the gearbox and drive mechanism during assembly. This allows for relative rotation when fasteners such as screws and bolts are installed, driven by external forces, affecting assembly accuracy and the overall stability of the tool. Furthermore, some electric chainsaws have a single integrated structure for the drive mechanism and gearbox, resulting in poor heat dissipation and inconvenience in daily maintenance and after-sales repair.

[0003] Therefore, in order to address the aforementioned technical problems, it is necessary to provide a power transmission system and an electric chainsaw.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this application and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0005] The purpose of this application is to provide a power transmission system and an electric chainsaw that can simplify the assembly process, improve assembly accuracy, enhance stability, reduce production costs, and facilitate daily maintenance and after-sales repair.

[0006] To achieve the above objectives, a specific embodiment of this application provides the following technical solution:

[0007] A power transmission system, the power transmission system comprising:

[0008] Gearbox;

[0009] The drive mechanism is equipped with an output shaft, which is inserted into the gearbox and is installed in conjunction with the gearbox.

[0010] The stop pin is installed in the gearbox and drive mechanism;

[0011] Fixed components that connect the drive mechanism and gearbox.

[0012] In one or more embodiments of this application, a first mounting hole is provided on the gearbox, a second mounting hole is provided on the drive mechanism, and the ends of the stop pins are respectively inserted into the first mounting hole and the second mounting hole, and the first mounting hole and the second mounting hole are coaxially arranged.

[0013] In one or more embodiments of this application, the first mounting hole and the second mounting hole are arranged parallel to the output shaft axial direction; and / or,

[0014] The first mounting hole and / or the second mounting hole are through holes or blind holes.

[0015] In one or more embodiments of this application, the gearbox includes a first housing and a first mounting portion disposed on the first housing and extending outwardly, wherein a first mounting hole is disposed in the first mounting portion; and / or,

[0016] The drive mechanism includes a second housing, a stator assembly and a rotor assembly disposed within the second housing, and a second mounting portion disposed on the second housing and extending toward the gearbox, with a second mounting hole disposed on the second mounting portion; and / or,

[0017] The length of the stop pin extending into the first mounting hole is less than or equal to the length of the first mounting hole; and / or,

[0018] The length of the stop pin extending into the second mounting hole is less than or equal to the length of the second mounting hole; and / or,

[0019] The outer wall of the stop pin is tightly fitted with the inner wall of the first mounting hole and / or the inner wall of the second mounting hole.

[0020] In one or more embodiments of this application, the fixing component includes at least one of fasteners, snap-fit ​​elements, or welded layers.

[0021] In one or more embodiments of this application, the fixing component includes a bracket, a first fastener, and a second fastener. The bracket is disposed between the gearbox and the drive mechanism. The first fastener passes through the bracket and the gearbox. The second fastener passes through the bracket and the drive mechanism. The bracket has a third mounting hole for the stop pin or the second fastener to pass through.

[0022] In one or more embodiments of this application, the bracket includes a ring portion that abuts against the drive mechanism and a bent portion that is bent on the ring portion, a first fastener passing through the bent portion and a second fastener passing through the ring portion.

[0023] In one or more embodiments of this application, the bracket includes a plurality of bent portions spaced circumferentially along the ring portion; and / or,

[0024] The bend is parallel to the axial direction of the output shaft; and / or,

[0025] There is an angle between the rotation center line of the gearbox and the rotation center line of the output shaft; and / or,

[0026] The outer wall of the stop pin is separated from the inner wall of the third mounting hole; and / or,

[0027] The ring is provided with an outwardly extending reinforcing part, and the third mounting hole is located on the reinforcing part.

[0028] In one or more embodiments of this application, the axis of the first fastener is arranged radially along the drive mechanism; and / or,

[0029] The axis of the second fastener is set parallel to the axial direction of the output shaft; and / or,

[0030] The axis of the first fastener and the axis of the second fastener are located on the same plane.

[0031] Another specific embodiment of this application provides the following technical solution:

[0032] An electric chainsaw includes a housing and a power transmission system as described above disposed in the housing. The support in the power transmission system includes two bent portions symmetrically disposed on both sides of a ring portion, and the line connecting the two bent portions and the parting line of the housing are located on the same plane.

[0033] Compared with the prior art, the power transmission system of this application has the following advantages:

[0034] This application, through the cooperation of the output shaft and the stop pin, can prevent relative rotation between the gearbox and the drive mechanism, thereby improving the assembly accuracy of the gearbox and the drive mechanism during the assembly process, simplifying the assembly process, and improving the stability and lifespan of the tool.

[0035] This application separates the gearbox and drive mechanism, which facilitates heat dissipation, daily maintenance, and after-sales repair, thereby reducing operating costs. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is an exploded structural diagram of the power transmission system in Embodiment 1 of this application;

[0038] Figure 2 This is another exploded structural diagram of the power transmission system in Embodiment 1 of this application;

[0039] Figure 3 This is a top view of the power transmission system in Embodiment 1 of this application;

[0040] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure at point AA;

[0041] Figure 5 for Figure 4 Enlarged view of the local structure at point A;

[0042] Figure 6 This is a schematic diagram of the main structure of the power transmission system in Embodiment 1 of this application;

[0043] Figure 7 for Figure 6 Schematic diagram of the cross-sectional structure at point BB.

[0044] Explanation of key figure labels:

[0045] 1-Gearbox; 11-First housing; 12-First mounting part; 121-First mounting hole;

[0046] 2-Drive mechanism; 20-Output shaft; 21-Second housing; 22-Stator assembly and rotor assembly; 23-Second mounting part; 231-Second mounting hole;

[0047] 3-Stop pin;

[0048] 4-Fixing component; 41-Bracket; 411-Ring; 4111-Third mounting hole; 4112-Reinforcing part; 412-Bending part; 42-First fastener; 43-Second fastener. Detailed Implementation

[0049] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of this application.

[0050] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0051] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0052] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0053] The existing power transmission system of electric chainsaws cannot ensure the relative fixation of the gearbox and drive mechanism during the assembly process. As a result, when installing fasteners such as screws and bolts, they are easily driven by external forces to rotate relative to each other, which affects the assembly accuracy and the overall stability of the tool.

[0054] Example 1:

[0055] Reference Figures 1 to 7 As shown, the power transmission system in this application includes: a gearbox 1, a drive mechanism 2, a stop pin 3, and a fixing component 4. The drive mechanism 2 has an output shaft 20, which is inserted into and linked with the gearbox 1; the stop pin 3 passes through the gearbox 1 and the drive mechanism 2, and the axis of the stop pin 3 does not coincide with the axis of the output shaft 20; the fixing component 4 connects the drive mechanism 2 and the gearbox 1. The gearbox 1 is a conventional gearbox and will not be described in detail here. The drive mechanism 2 can be a rotary drive mechanism with rotary drive function, such as a servo motor, stepper motor, or magnetic drive motor.

[0056] The interaction between the output shaft 20 and the stop pin 3 prevents relative rotation between the gearbox 1 and the drive mechanism 2, thereby improving the assembly accuracy of the gearbox 1 and the drive mechanism 2 during assembly, simplifying the assembly process, and improving the stability and lifespan of the tool. In addition, the separate design of the gearbox 1 and the drive mechanism 2 facilitates heat dissipation, daily maintenance and after-sales repair, and reduces operating costs.

[0057] For ease of installation of stop pin 3, refer to... Figure 1 As shown, the gearbox 1 in this application has a first mounting hole 121, and the drive mechanism 2 has a second mounting hole 231. The two ends of the stop pin 3 pass through the first mounting hole 121 and the second mounting hole 231, respectively, and the first mounting hole 121 and the second mounting hole 231 are coaxially arranged. The stop pin 3 can be arranged parallel to the axial direction of the output shaft 20 or not parallel to the axial direction of the output shaft 20, as long as it satisfies the requirement that the two ends of the stop pin 3 pass through the gearbox 1 and the drive mechanism 2 respectively, under the premise that the output shaft 20 and the gearbox 1 are linked and installed.

[0058] Preferably, refer to Figures 1-5 As shown, in this embodiment, the first mounting hole 121 and the second mounting hole 231 are arranged parallel to the axial direction of the output shaft 20. Compared with the arrangement of the first mounting hole 121 and the second mounting hole 231 in other directions, this embodiment is easier to process and manufacture, and helps to reduce production costs.

[0059] Optionally, the first mounting hole 121 in this application can be a through hole or a blind hole, and the second mounting hole 231 can be a through hole or a blind hole. For example, for ease of manufacturing, refer to... Figure 5 As shown, in this embodiment, both the first mounting hole 121 and the second mounting hole 231 are through holes.

[0060] To facilitate the insertion of the stop pin 3 into the gearbox 1, refer to... Figure 1As shown, the gearbox 1 in this embodiment includes a first housing 11 and a first mounting portion 12 disposed on the first housing 11 and extending outward, with a first mounting hole 121 installed in the first mounting portion 12.

[0061] Preferably, refer to Figure 5 As shown, the gearbox 1 in this embodiment includes a limiting block 1211 located in the first mounting hole 121, and the stop pin 3 abuts against the limiting block 1211. The design of the limiting block 1211 ensures that both ends of the stop pin 3 are always inserted into the first mounting hole 121 and the second mounting hole 231 respectively, ensuring that there is no relative rotation between the gearbox 1 and the drive mechanism 2.

[0062] To facilitate the insertion of the stop pin 3 into the drive mechanism 2, refer to... Figure 2 , Figure 4 As shown, the drive mechanism 2 in this embodiment includes a second housing 21, a stator assembly and a rotor assembly 22 disposed in the second housing 21, and a second mounting portion 23 disposed on the second housing 21 and extending toward the gearbox 1. A second mounting hole 231 is disposed on the second mounting portion 23, and the stop pin 3 is separated from both the stator assembly and the rotor assembly 22. According to this design, in the working state of the drive mechanism 2, friction between the stop pin 3 and the stator assembly and the rotor assembly 22 can be prevented, thus avoiding a reduction in the service life of the drive mechanism 2.

[0063] Preferably, refer to Figure 5 As shown, in this embodiment, the length of the stop pin 3 extending into the second mounting hole 231 is less than or equal to the length of the second mounting hole 231. Based on this design, the stop pin 3 is separated from the stator assembly and rotor assembly 22. During the operation of the drive mechanism 2, friction between the stop pin 3 and the stator assembly and rotor assembly 22 can be prevented, thus avoiding a reduction in the service life of the drive mechanism 2.

[0064] Preferably, for ease of installation of the stop pin 3, refer to Figure 5 As shown, in this embodiment, the length of the stop pin 3 extending into the first mounting hole 121 is less than or equal to the length of the first mounting hole 121.

[0065] To ensure that the two ends of the stop pin 3 always pass through the first mounting hole 121 and the second mounting hole 231 respectively, and to ensure that there is no relative rotation between the gearbox 1 and the drive mechanism 2, refer to... Figure 5 As shown, in this embodiment, the outer wall of the stop pin 3 is tightly fitted with the inner wall of the first mounting hole 121 and / or the inner wall of the second mounting hole 231.

[0066] The fixing component 4 in this application includes at least one of fasteners, snap-fit ​​components, or welded layers. Any component that can securely mount the gearbox 1 and the drive mechanism 2 via the fixing component 4 should be protected within the scope of this application.

[0067] For ease of fixing and installing gearbox 1 and drive mechanism 2, refer to Figure 3 , Figure 5 , Figure 6 As shown, the fixing component 4 in this embodiment includes a bracket 41, a first fastener 42, and a second fastener 43. The bracket 41 is disposed between the gearbox 1 and the drive mechanism 2. The first fastener 42 passes through the bracket 41 and the gearbox 1, and the second fastener 43 passes through the bracket 41 and the drive mechanism 2. The bracket 41 has a third mounting hole 4111 for the stop pin 3 or the second fastener 43 to pass through. When the stop pin 3 passes through the third mounting hole 4111, the axis of the third mounting hole 4111 is coaxial with the axis of the first mounting hole 121 and the mounting hole of the second mounting hole 231. When the second fastener 43 passes through the third mounting hole 4111, the axis of the third mounting hole 4111 is not coaxial with the axis of the first mounting hole 121 and the mounting hole of the second mounting hole 231. The first fastener 42 and the second fastener 43 can be screws, bolts, screws, etc. For example, in this embodiment, the first fastener 42 and the second fastener 43 are screws.

[0068] Reference Figure 6 , Figure 7 As shown, the bracket 41 in this embodiment includes a ring portion 411 that abuts against the drive mechanism 2 and a bent portion 412 that is bent onto the ring portion 411. A first fastener 42 passes through the bent portion 412, and a second fastener 43 passes through the ring portion 411. Exemplarily, two bent portions 412 are provided in this embodiment and are symmetrically arranged around the periphery of the ring portion 411. Of course, in other embodiments, three or four bent portions 412 may be provided, as long as the bracket 41 can be fixedly installed with the gearbox 1. This application does not limit the number of bent portions 412.

[0069] Preferably, refer to Figure 1 , Figure 2 As shown, the bracket 41 in this embodiment includes a plurality of bent portions 412 spaced circumferentially along the ring portion 411. This design allows for a uniform load distribution between the gearbox 1 and the drive mechanism 2, reducing local stress concentration, improving structural strength and fatigue resistance, preventing failures caused by excessive local deformation, and enhancing the operational stability of the power transmission system.

[0070] Preferably, to facilitate the installation of the first fastener 42, refer to Figure 1 , Figure 2 As shown, in this embodiment, the bent portion 412 is parallel to the axial direction of the output shaft 20.

[0071] It should be noted that, referring to Figure 1 , Figure 2As shown, because there is an angle between the rotation center line L1 of the gearbox 1 and the rotation center line L2 of the output shaft 20 in this embodiment, the assembly of the gearbox 1 and the drive mechanism 2 is relatively constant. After setting the stop pin 3, the torsion between the gearbox 1 and the drive mechanism 2 can be prevented, which facilitates the assembly.

[0072] To avoid friction between the stop pin 3 and the third mounting hole 4111, refer to... Figure 5 As shown, in this embodiment, the outer wall of the stop pin 3 is separated from the inner wall of the third mounting hole 4111.

[0073] Since a third mounting hole 4111 is provided on the bracket 41, in order to strengthen the structural strength of the 4111 part, refer to Figure 1 , Figure 2 As shown, in this embodiment, the ring portion 411 is provided with an outwardly extending reinforcing portion 4112, and the third mounting hole 4111 is located on the reinforcing portion 4112.

[0074] For ease of processing and production, the axis of the first fastener 42 in this application is arranged radially along the drive mechanism 2, and the axis of the second fastener 43 is arranged parallel to the axial direction of the output shaft 20. The first fastener 42 can be installed radially along the drive mechanism 2, and the second fastener 43 can be installed parallel to the axial direction of the output shaft 20.

[0075] Optionally, to facilitate quick installation of the first fastener 42 and the second fastener 43, refer to Figure 7 As shown, in this embodiment, the axis of the first fastener 42 and the axis of the second fastener 43 are located on the same plane.

[0076] Example 2:

[0077] The electric chainsaw (not shown) in this embodiment includes a housing and a power transmission system, as shown in Embodiment 1, disposed within the housing. The support in the power transmission system includes two bent portions symmetrically arranged on both sides of the ring portion. The line connecting the two bent portions and the parting line of the housing are on the same plane. Compared to other embodiments where the bent portions 412 are three or four, this embodiment uses two bent portions 412 symmetrically arranged around the ring portion 411, which facilitates the assembly of the power transmission system into the electric chainsaw. The novel power transmission system avoids relative rotation between the gearbox and the drive mechanism, improving the assembly accuracy of the gearbox and drive mechanism during assembly, simplifying the assembly process, and increasing the tool's stability and lifespan. Furthermore, the separate design of the gearbox and drive mechanism facilitates heat dissipation, reduces daily maintenance and after-sales repair, and lowers operating costs.

[0078] In the description of the embodiments of this application, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly placed when the product of this application is used, or the orientation or positional relationship commonly understood by those skilled in the art. They are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0079] In the description of the embodiments of this application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0080] In the description of the embodiments of this application, it should also be noted that the terms "first", "second", etc. used herein do not specifically refer to any order or sequence, nor are they intended to limit this application; they are merely used to distinguish components or operations described using the same technical terms.

[0081] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this application is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this application. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0082] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A power transmission system, characterized in that, The power transmission system includes: Gearbox (1); The drive mechanism (2) is provided with an output shaft (20), which is inserted into the gearbox (1) and is linked to the gearbox (1); The stop pin (3) is inserted into the gearbox (1) and the drive mechanism (2); The fixed component (4) connects the drive mechanism (2) and the gearbox (1).

2. The power transmission system according to claim 1, characterized in that, The gearbox (1) has a first mounting hole (121) and the drive mechanism (2) has a second mounting hole (231). The end of the stop pin (3) passes through the first mounting hole (121) and the second mounting hole (231) respectively. The first mounting hole (121) and the second mounting hole (231) are coaxially arranged.

3. The power transmission system according to claim 2, characterized in that, The first mounting hole (121) and the second mounting hole (231) are arranged parallel to the axial direction of the output shaft (20); and / or, The first mounting hole (121) and / or the second mounting hole (231) are through holes or blind holes.

4. The power transmission system according to claim 2, characterized in that, The gearbox (1) includes a first housing (11) and a first mounting portion (12) disposed on the first housing (11) and extending outward, wherein a first mounting hole (121) is disposed in the first mounting portion (12); and / or, The drive mechanism (2) includes a second housing (21), a stator assembly and a rotor assembly (22) disposed in the second housing (21), and a second mounting portion (23) disposed on the second housing (21) and extending toward the gearbox (1), with a second mounting hole (231) disposed on the second mounting portion (23); and / or, The length of the stop pin (3) extending into the first mounting hole (121) is less than or equal to the length of the first mounting hole (121); and / or, The length of the stop pin (3) extending into the second mounting hole (231) is less than or equal to the length of the second mounting hole (231); and / or, The outer wall of the stop pin (3) is tightly fitted with the inner wall of the first mounting hole (121) and / or the inner wall of the second mounting hole (231).

5. The power transmission system according to claim 1, characterized in that, The fixing component (4) includes at least one of fasteners, snap fasteners, or welded layers.

6. The power transmission system according to claim 1, characterized in that, The fixing component (4) includes a bracket (41), a first fastener (42) and a second fastener (43). The bracket (41) is disposed between the gearbox (1) and the drive mechanism (2). The first fastener (42) passes through the bracket (41) and the gearbox (1). The second fastener (43) passes through the bracket (41) and the drive mechanism (2). The bracket (41) has a third mounting hole (4111) for the stop pin (3) or the second fastener (43) to pass through.

7. The power transmission system according to claim 6, characterized in that, The bracket (41) includes a ring portion (411) that abuts against the drive mechanism (2) and a bent portion (412) that is bent on the ring portion (411). The first fastener (42) passes through the bent portion (412) and the second fastener (43) passes through the ring portion (411).

8. The power transmission system according to claim 7, characterized in that, The bracket (41) includes a plurality of bent portions (412) spaced circumferentially along the ring portion (411); and / or, The bent portion (412) is parallel to the axial direction of the output shaft (20); and / or, There is an angle between the rotation center line of the gearbox (1) and the rotation center line of the output shaft (20); and / or, The outer wall of the stop pin (3) is separated from the inner wall of the third mounting hole (4111); and / or, The ring portion (411) is provided with an outwardly extending reinforcing portion (4112), and the third mounting hole (4111) is located on the reinforcing portion (4112).

9. The power transmission system according to claim 7, characterized in that, The axis of the first fastener (42) is arranged radially along the drive mechanism (2); and / or, The axis of the second fastener (43) is arranged parallel to the axial direction of the output shaft (20); and / or, The axis of the first fastener (42) and the axis of the second fastener (43) are located on the same plane.

10. An electric chainsaw, characterized in that, The electric chainsaw includes a housing and a power transmission system as described in any one of claims 1 to 9 disposed in the housing. The support in the power transmission system includes two bent portions symmetrically disposed on both sides of the ring portion, and the line connecting the two bent portions and the mold parting line of the housing are located on the same plane.

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