A brake structure for an electric chainsaw
By using a torsion spring and brake linkage design, the braking structure of the electric chainsaw is simplified, solving the problem of rebound when cutting hard objects and achieving rapid braking and improved safety.
Patent Information
- Application Number
- CN202521803538.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-22
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-08-22
AI Technical Summary
Existing electric chainsaws have complex braking structures and are cumbersome to operate, making it difficult to effectively prevent the danger caused by the chainsaw rebounding when cutting hard objects.
It adopts a torsion spring and brake linkage structure. The radial tightening of the torsion spring increases the friction with the output shaft to achieve rapid braking. Combined with the design of brake pads and grooves, the braking operation is simplified.
It enables rapid braking of the electric chainsaw, simplifies braking operations, and improves safety and ease of use.
Smart Images
Figure CN224673905U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of power tool technology, specifically relating to a braking structure for an electric chainsaw. Background Technology
[0002] An electric chainsaw is a traditional power tool that offers high efficiency. However, when cutting hard objects such as knots or metal, it may bounce towards the operator, a phenomenon known as a rebound, which can be dangerous. In such a situation, the chainsaw must be braked immediately to stop the chain within a short time to prevent injury. To prevent this, electric chainsaws typically have an internal braking mechanism, but current chainsaws are quite complex and cumbersome to operate.
[0003] Therefore, there is an urgent need to provide a braking structure for electric chainsaws to solve the above problems. Utility Model Content
[0004] The purpose of this invention is to at least solve the problem of how to simplify the brake structure of an electric chainsaw. This purpose is achieved through the following technical solution:
[0005] The first aspect of this utility model provides a braking structure for an electric chainsaw, comprising:
[0006] A braking structure for an electric chainsaw, characterized in that it comprises:
[0007] A housing, wherein an output shaft is disposed inside the housing;
[0008] A torsion spring is sleeved on the output shaft, one end of the torsion spring is fixedly connected to the output shaft, and the other end of the torsion spring protrudes in a direction away from the axis of the output shaft to form a contact.
[0009] A brake linkage is disposed inside the housing, with its first end rotatably connected to the housing and its second end having a groove.
[0010] A protective plate is connected to the first end of the brake linkage and is used to drive the brake linkage to rotate.
[0011] The brake pad is rotatably connected to the inner wall of the housing at its center. One end of the brake pad is located inside the groove. When the brake linkage rotates in the forward direction, the other end of the brake pad can abut against the contact to brake the output shaft.
[0012] Using the electric chainsaw braking structure provided in this technical solution, when the electric chainsaw rebounds or is manually triggered by the user, the protective plate is subjected to impact force or manual pressing, causing the brake linkage connected to it to rotate clockwise around its first end. The groove at the second end of the brake linkage moves upwards with the rotation, pushing one end of the brake pad embedded in the groove, forcing the brake pad to rotate around its central axis. As the brake pad rotates, its other end contacts and presses against the torsion spring contact on the output shaft. Because the torsion spring contact bulges away from the output shaft axis, the pressure of the brake pad forces the torsion spring to tighten radially, thereby increasing the friction between it and the output shaft. The torsion spring and the output shaft are fixedly connected; after the torsion spring tightens, it directly locks the output shaft through static friction, thus stopping the rotation of the power output gear and ultimately braking the chainsaw quickly. When the protective plate is manually reset (pushed back to its initial position), the brake linkage rotates in the opposite direction, releasing the pressure on the brake pad. The torsion spring returns to its original shape due to elasticity, the contact separates from the brake pad, the output shaft regains its free rotation capability, and the electric chainsaw can start normally. By setting a groove structure on the brake linkage, the brake pads are connected to the brake linkage through the groove, which increases the contact area between the two, resulting in a robust structure and simple assembly.
[0013] In addition, the electric chainsaw braking structure of this utility model may also have the following additional technical features:
[0014] In some embodiments of this utility model, the brake linkage includes a connecting part, a bending part, and a base plate. The connecting part is rotatably connected to the housing and connected to the protective plate. The bending part is connected to the connecting part. The bending part has an arc-shaped sidewall. The base plate is connected to the side of the bending part and forms the groove with the arc-shaped sidewall.
[0015] In some embodiments of this utility model, the brake pad has an arc-shaped surface on the outer side of one end of the groove, and the arc-shaped surface and the arc-shaped sidewall are in sliding contact.
[0016] In some embodiments of this utility model, a spring sheet is provided inside the housing, and the spring sheet has a snap-fit protrusion, the snap-fit protrusion having a first side and a second side that are opposite to each other.
[0017] In the working state, the first end of the curved portion abuts against one side of the brake pad and the first side surface, causing the curved portion to have a tendency to rotate in the opposite direction.
[0018] In the braking state, the first end of the curved portion abuts against the side opposite to the brake pad and the second side, causing the curved portion to have a tendency to rotate in the positive direction.
[0019] In some embodiments of this utility model, the inner wall of the housing is provided with two insertion portions, and the two ends of the spring sheet are respectively inserted into the insertion portions.
[0020] In some embodiments of this utility model, a micro switch is provided inside the housing, and when the brake linkage rotates, the second end of the bent portion can contact or move away from the micro switch.
[0021] In some embodiments of this utility model, the housing has two connecting holes arranged opposite to each other, and the two ends of the connecting part extend out from the connecting holes and are connected to the protective plate.
[0022] In some embodiments of this utility model, the protective plate includes a protective part and two mounting parts. The two mounting parts are respectively connected to the protective part and are spaced apart. The mounting part is provided with a positioning groove. The connecting part is located between the two mounting parts and both ends of the connecting part are respectively inserted into the positioning groove.
[0023] In some embodiments of this utility model, a gearbox is provided inside the housing, a power output gear is provided inside the gearbox, the output shaft is connected to the power output gear, and the output shaft extends out from the gearbox.
[0024] In some embodiments of this utility model, the gearbox includes a housing and a cover connected to each other, the power output gear is located inside the housing, the output shaft extends from the cover, the cover is provided with a fixing part, the inner wall of the housing is provided with a connecting shaft, the middle part of the brake pad is rotatably sleeved on the connecting shaft, and the fixing part and the end of the connecting shaft away from the housing are connected. Attached Figure Description
[0025] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:
[0026] Figure 1 A partial structural schematic diagram of the electric chainsaw braking structure according to an embodiment of the present invention is shown.
[0027] Figure 2 An exploded view of a partial structure of an electric chainsaw brake structure according to an embodiment of the present invention is shown schematically.
[0028] Figure 3 A schematic diagram of the brake linkage according to an embodiment of the present invention is shown.
[0029] Figure 4 yes Figure 1 A magnified view of a section at point A in the middle;
[0030] Figure 5 A partial structural diagram (working state) of the electric chainsaw braking structure according to an embodiment of the present invention is shown schematically.
[0031] Figure 6 A partial structural diagram (braking state) of the electric chainsaw braking structure according to an embodiment of the present invention is shown schematically.
[0032] The labels in the attached diagram are as follows:
[0033] 100. Housing; 110. Insertion part; 200. Gearbox; 210. Housing body; 220. Cover; 221. Fixing part; 300. Power output gear; 310. Output shaft; 400. Torsion spring; 500. Brake linkage; 510. Connecting part; 520. Bending part; 521. Arc-shaped side wall; 530. Base plate; 600. Protective plate; 610. Protective part; 620. Mounting part; 700. Brake pad; 800. Spring plate; 810. Snap-fit protrusion; 811. First side; 812. Second side; 900. Micro switch. Detailed Implementation
[0034] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
[0035] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.
[0036] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.
[0037] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations.
[0038] Figure 1 A partial structural diagram of an electric chainsaw brake structure according to an embodiment of the present invention is shown schematically. Figure 2 An exploded view of a partial structure of an electric chainsaw brake structure according to an embodiment of the present invention is shown schematically. Figure 1 and Figure 2 As shown, this utility model proposes a braking structure for an electric chainsaw, including a housing 100, a torsion spring 400, a brake linkage 500, a protective plate 600, and a brake pad 700. An output shaft 310 is disposed inside the housing 100. The torsion spring 400 is sleeved on the output shaft 310, with one end of the torsion spring 400 fixedly connected to the output shaft 310, and the other end of the torsion spring 400 protruding away from the axis of the output shaft 310 to form a contact. Inside the housing 100, the first end of the brake linkage 500 is rotatably connected to the housing 100, and the second end of the brake linkage 500 has a groove. The protective plate 600 is connected to the first end of the brake linkage 500 and is used to drive the brake linkage 500 to rotate. The middle part of the brake pad 700 is rotatably connected to the inner wall of the housing 100, with one end of the brake pad 700 located inside the groove. When the brake linkage 500 rotates forward, the other end of the brake pad 700 can abut against the contact to brake the output shaft 310.
[0039] Using the electric chainsaw braking structure provided in this technical solution, when the electric chainsaw rebounds or is manually triggered by the user, the protective plate 600 is subjected to impact force or manual pressing, causing the brake linkage 500 connected to it to rotate clockwise around its first end. The groove at the second end of the brake linkage 500 moves upward with the rotation, pushing one end of the brake pad 700 embedded in the groove, forcing the brake pad 700 to rotate around its central axis. As the brake pad 700 rotates, its other end contacts and presses against the contact of the torsion spring 400 on the output shaft 310. Because the contact of the torsion spring 400 protrudes away from the axis of the output shaft 310, the pressure of the brake pad 700 forces the torsion spring 400 to tighten radially, thereby increasing the friction between it and the output shaft 310. The torsion spring 400 is fixedly connected to the output shaft 310; after the torsion spring 400 tightens, it directly locks the output shaft 310 through static friction, thus stopping the rotation of the power output gear 300 and ultimately causing the saw chain to brake quickly. When the protective plate 600 is manually reset (pushed back to its initial position), the brake linkage 500 rotates in the opposite direction, releasing the pressure on the brake pad 700 from the groove. The torsion spring 400 returns to its original shape due to its elasticity, the contact separates from the brake pad 700, the output shaft 310 regains its free rotation capability, and the electric chainsaw can start normally. By setting a groove structure on the brake linkage 500, the brake pad 700 is connected to the brake linkage 500 through the groove, increasing the contact area between the two, resulting in a robust structure and simple assembly.
[0040] See also Figure 1 and Figure 2 The housing 100 has a gearbox 200 inside, and a power output gear 300 is installed inside the gearbox 200. The output shaft 310 is connected to the power output gear 300 and extends out of the gearbox 200.
[0041] The power output gear 300 transmits power from the drive unit (such as a motor) to the saw chain, thereby driving the saw chain to complete the cutting action. Optionally, the power output gear 300 is provided with a threaded hole, and the output shaft 310 is provided with an external thread, and the power output gear 300 and the output shaft 310 are connected by threads.
[0042] Furthermore, the gearbox 200 includes a housing 210 and a cover 220 connected to each other. The power output gear 300 is located inside the housing 210, and the output shaft 310 extends out from the cover 220. The cover 220 is provided with a fixing part 221. A connecting shaft is provided on the inner wall of the housing 100. The middle part of the brake pad 700 is rotatably sleeved on the connecting shaft. The fixing part 221 and the end of the connecting shaft away from the housing 100 are connected.
[0043] Optionally, the housing 210 and the cover 220 are fixedly connected by bolts, which facilitates assembly and ensures a stable connection. After the cover 220 and housing 210 are connected, the fixing part 221 can be inserted into the connecting shaft, thereby limiting the brake pad 700. With this structural form, the overall structure is compact and the equipment operates reliably.
[0044] Furthermore, Figure 3 A schematic diagram of the brake linkage 500 according to an embodiment of the present invention is shown. See also: Figures 1 to 3 The brake linkage 500 includes a connecting part 510, a bending part 520, and a base plate 530. The connecting part 510 is rotatably connected to the housing 100 and connected to the protective plate 600. The bending part 520 is connected to the connecting part 510. The bending part 520 has an arc-shaped sidewall 521. The base plate 530 is connected to the side of the bending part 520 and forms a groove with the arc-shaped sidewall 521.
[0045] The brake link 500 adopts this structural form, which has strong structural strength and can achieve a stable connection between the brake link 500 and the brake pad 700, ensuring the sensitivity of the brake structure.
[0046] Furthermore, the brake pad 700 has an arc-shaped surface on the outer side of one end of the groove, and the arc-shaped surface and the arc-shaped sidewall 521 are in sliding contact.
[0047] The sliding contact between the arc-shaped surface and the arc-shaped sidewall 521 can effectively increase the contact area between the brake linkage 500 and the brake pad 700, ensuring the stability of the transmission. Furthermore, the sliding contact can reduce friction, thereby reducing wear between components and effectively extending the service life of the electric chainsaw brake structure.
[0048] Further, see also Figure 1 and Figure 2 The housing 100 has two connecting holes arranged opposite each other, and the two ends of the connecting part 510 extend from the connecting holes and are connected to the protective plate 600.
[0049] By passing the connecting part 510 through the connecting hole, the brake link 500 and the housing 100 are rotatably connected. At the same time, the protective plate 600 is connected to the connecting part 510. By controlling the protective plate 600, the rotation of the brake link 500 can be achieved.
[0050] Furthermore, the protective plate 600 includes a protective part 610 and two mounting parts 620. The two mounting parts 620 are respectively connected to the protective part 610 and are spaced apart. The mounting part 620 is provided with a positioning groove. The connecting part 510 is located between the two mounting parts 620 and both ends of the connecting part 510 are respectively inserted into the positioning groove.
[0051] Optionally, the protective part 610 is generally a rounded rectangular frame structure, making it easy for the operator to grip. The connecting part 510 is generally a block structure, and correspondingly, the positioning groove is a rectangular groove. Understandably, the cross-sectional shape of the connecting part 510 should be non-circular, and the shape of the positioning groove is set according to the shape of the connecting part 510, so as to ensure that the two can be firmly connected and will not rotate relative to each other.
[0052] Figure 4 yes Figure 1 A magnified view of a portion of point A in the middle. Figure 5 A partial structural diagram (in working state) of the electric chainsaw braking structure according to an embodiment of the present invention is shown schematically. Figure 6 A partial structural diagram (braking state) of the electric chainsaw braking structure according to an embodiment of the present invention is shown schematically. See also Figures 4 to 6 The housing 100 is provided with a spring plate 800. The spring plate 800 has a snap-fit protrusion 810. The snap-fit protrusion 810 has a first side 811 and a second side 812 that are opposite to each other. In the working state, the first end of the bent portion 520 abuts against the side of the brake pad 700 and the first side 811, so that the bent portion 520 has a tendency to rotate in the opposite direction. In the braking state, the first end of the bent portion 520 abuts against the side of the brake pad 700 and the second side 812, so that the bent portion 520 has a tendency to rotate in the forward direction.
[0053] Understandably, the brake pad 700 has a limiting function, enabling the brake linkage 500 to remain in the working or braking state, thereby keeping the brake pad 700 away from or abutting against the contact of the torsion spring 400. The elasticity of the spring 800 can buffer the movement of the brake linkage 500. Optionally, the middle part of the spring 800 is bent upward to form a snap-fit protrusion 810.
[0054] See also Figure 4 The inner wall of the housing 100 is provided with two insertion parts 110, and the two ends of the spring plate 800 are respectively inserted into the insertion parts 110.
[0055] Understandably, the plug-in part 110 serves to connect and fix the spring sheet 800. The plug-in part 110 is provided with a socket, and the two ends of the spring sheet 800 are inserted into the socket, which can effectively fix the spring sheet 800 without causing too much impact on the elastic performance of the spring sheet 800.
[0056] See also Figure 5 and Figure 6 The housing 100 is equipped with a micro switch 900. When the brake linkage 500 rotates, the second end of the bent part 520 can contact or move away from the micro switch 900.
[0057] In this embodiment, when the second end of the bent portion 520 moves away from the micro switch 900, the drive unit and the power supply are connected, and the drive unit drives the power output gear 300 to rotate; when the second end of the bent portion 520 abuts against the micro switch 900, the drive unit and the power supply are disconnected, and the electric chainsaw stops working.
[0058] The working principle of the electric chainsaw braking structure in this embodiment is as follows:
[0059] See Figure 5 When the electric chainsaw is in operation, the first side of the snap-fit protrusion 810 of the spring plate 800 abuts against the inner side of the lower end of the bent part 520, and the upper end of the bent part 520 moves away from the micro switch 900 to connect the drive unit and the power supply. At the same time, the second end of the brake plate 700 moves away from the contact of the torsion spring 400, so that the output shaft 310 can rotate.
[0060] See Figure 6 When the electric chainsaw is in braking state, the second side of the snap-fit protrusion 810 of the spring plate 800 abuts against the outer side of the lower end of the bent part 520, and the upper end of the bent part 520 abuts against the micro switch 900 to disconnect the drive unit from the power supply. At the same time, the brake plate 700 and the contact of the torsion spring 400 abut against each other, so that the output shaft 310 cannot rotate.
[0061] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims.
Claims
1. A braking structure for an electric chainsaw, characterized in that, include: A housing (100) having an output shaft (310) disposed inside the housing (100); A torsion spring (400) is sleeved on the output shaft (310). One end of the torsion spring (400) is fixedly connected to the output shaft (310), and the other end of the torsion spring (400) protrudes in a direction away from the axis of the output shaft (310) to form a contact. A brake link (500) is disposed inside the housing (100). The first end of the brake link (500) is rotatably connected to the housing (100), and the second end of the brake link (500) is provided with a groove. A protective plate (600) is connected to the first end of the brake linkage (500) for driving the brake linkage (500) to rotate; Brake pad (700), the middle part of which is rotatably connected to the inner wall of the housing (100), one end of which is located inside the groove, and when the brake linkage (500) rotates in the forward direction, the other end of which can abut against the contact to brake the output shaft (310).
2. The electric chainsaw braking structure according to claim 1, characterized in that, The brake linkage (500) includes a connecting part (510), a bending part (520), and a base plate (530). The connecting part (510) is rotatably connected to the housing (100) and connected to the protective plate (600). The bending part (520) is connected to the connecting part (510). The bending part (520) has an arc-shaped sidewall (521). The base plate (530) is connected to the side of the bending part (520) and forms the groove with the arc-shaped sidewall (521).
3. The electric chainsaw braking structure according to claim 2, characterized in that, The brake pad (700) has an arc-shaped surface on the outer side of one end of the groove, and the arc-shaped surface and the arc-shaped sidewall (521) are in sliding contact.
4. The electric chainsaw braking structure according to claim 2, characterized in that, The housing (100) is provided with a spring sheet (800) inside. The spring sheet (800) has a snap-fit protrusion (810). The snap-fit protrusion (810) has a first side surface (811) and a second side surface (812) that are opposite to each other. In the working state, the first end of the bent portion (520) abuts against the side of the brake pad (700) and the first side surface (811), causing the bent portion (520) to have a tendency to rotate in the opposite direction. In the braking state, the first end of the bent portion (520) abuts against the side opposite to the brake pad (700) and the second side (812), causing the bent portion (520) to have a tendency to rotate in the positive direction.
5. The electric chainsaw braking structure according to claim 4, characterized in that, The inner wall of the housing (100) is provided with two plug-in portions (110), and the two ends of the spring sheet (800) are respectively plugged into the plug-in portions (110).
6. The electric chainsaw braking structure according to claim 2, characterized in that, A micro switch (900) is provided inside the housing (100). When the brake linkage (500) rotates, the second end of the bent portion (520) can contact or move away from the micro switch (900).
7. The electric chainsaw braking structure according to claim 2, characterized in that, The housing (100) has two oppositely arranged connection holes, and the two ends of the connection part (510) extend out from the connection holes and are connected to the protective plate (600).
8. The electric chainsaw braking structure according to claim 2, characterized in that, The protective plate (600) includes a protective part (610) and two mounting parts (620). The two mounting parts (620) are respectively connected to the protective part (610) and are spaced apart. The mounting part (620) is provided with a positioning groove. The connecting part (510) is located between the two mounting parts (620) and both ends of the connecting part (510) are respectively inserted into the positioning groove.
9. The electric chainsaw braking structure according to any one of claims 1-8, characterized in that, The housing (100) is provided with a gearbox (200) inside, and a power output gear (300) is provided inside the gearbox (200). The output shaft (310) is connected to the power output gear (300), and the output shaft (310) extends out from the gearbox (200).
10. The electric chainsaw braking structure according to claim 9, characterized in that, The gearbox (200) includes a housing (210) and a cover (220) connected to each other. The power output gear (300) is located inside the housing (210). The output shaft (310) extends out from the cover (220). The cover (220) is provided with a fixing part (221). The inner wall of the housing (100) is provided with a connecting shaft. The middle part of the brake pad (700) is rotatably sleeved on the connecting shaft. The fixing part (221) and the end of the connecting shaft away from the housing (100) are connected.