Cam release mower brake

Abstract

The utility model discloses a mower brake of cam release relates to mower brake structure field, including the magnetic yoke, armature and brake disc, be provided with the release device on the magnetic yoke, be provided with release rod on the release device, the magnetic yoke with armature is connected on release device through release rod, rotates release device, release rod drives the magnetic yoke and moves in the direction of or away from brake disc, can fix or release brake disc, and the above -mentioned device can solve the inconvenient problem of the maintenance of the mower brake of existing mower brake because of lacking manual release device.

Description

Technical Field

[0001] This utility model relates to the field of lawnmower brake structure, and in particular to a cam-release lawnmower brake. Background Technology

[0002] Small garden machinery such as lawnmowers are usually equipped with electromagnetic brakes, which are generally installed at the rear of the drive motor to enable parking. Their basic working principle is as follows: When the vehicle starts, the electromagnetic brake is energized, generating magnetic force that attracts the armature, releasing the brake and allowing the motor to rotate freely to drive the lawnmower. When the lawnmower stops, the electromagnetic brake is de-energized, the magnetic force disappears, and the armature, under the action of a spring, presses against the brake disc, generating frictional torque to achieve braking and prevent the lawnmower from slipping.

[0003] However, most electromagnetic brakes on the market today, in order to reduce costs and simplify the structure, typically do not have an independent manual release device. This causes significant inconvenience during routine maintenance or overall machine overhaul: when it is necessary to move the lawnmower or adjust the transmission system, the brake cannot be easily released because it is in a power-off locked state, creating a major obstacle to maintenance work.

[0004] While some brake designs with release mechanisms exist, their structures are often quite complex, employing independent lever or threaded rod systems. This not only increases the number of parts and manufacturing costs but also makes assembly and adjustment processes more cumbersome, compromising reliability. Furthermore, these structures are prone to vibration and noise during vehicle transport, and their overall design often fails to adequately consider waterproofing requirements for outdoor use and spatial compatibility with encoders and other sensing components.

[0005] Therefore, there is an urgent need in this field for a manual release mechanism that is simple in structure, easy to operate, low in cost, and highly reliable, in order to solve the problem of the inconvenience of maintenance of existing lawnmower brakes. Utility Model Content

[0006] This invention provides a cam-release lawnmower brake, which can solve the problem of inconvenient maintenance caused by the lack of a manual release device in existing lawnmower brakes.

[0007] To solve the above problems, this utility model provides a cam-release lawnmower brake, including a magnetic yoke, an armature, and a brake disc; The magnetic yoke is provided with a release device, and the release device is provided with a release rod. The magnetic yoke and the armature are connected to the release device through the release rod. When the release device is rotated, the release rod drives the magnetic yoke to move toward or away from the brake disc, so as to fix or release the brake disc.

[0008] The cam-release lawnmower brake provided by this utility model has the following advantages compared with the prior art: When manual brake release is required, rotating the release device moves the release lever, which in turn moves the magnetic yoke away from the brake disc. Since both the magnetic yoke and the armature are connected to the release device, this movement of the magnetic yoke indirectly or directly forces the armature to disengage from the brake disc, thereby releasing the clamping force on the brake disc and releasing the brake. At this time, the motor spindle can rotate freely. When the release device is rotated in the opposite direction to the initial position, the release lever moves the magnetic yoke closer to the brake disc to reset it. The armature presses against the brake disc, generating braking torque again and fixing the brake disc. This brake has a simple and compact structure. Through the cam-type release device design, it realizes flexible switching between manual release and automatic braking, which can solve the problem of inconvenient maintenance caused by the lack of a manual release device in existing lawnmower brakes.

[0009] Compared to traditional electromagnetic brakes, this invention eliminates the need for complex lever or threaded rod systems, reducing the number of parts and assembly steps, thereby lowering manufacturing costs and improving reliability.

[0010] Preferably, the release device includes: A release plate is disposed on the yoke at a position relative to the armature on one side; A release element is rotatably mounted on the release plate. A release groove is provided on the release plate corresponding to the position of the release element. When the release element is rotated, the release element abuts against the magnetic yoke through the release groove or the release element disengages from the magnetic yoke.

[0011] Preferably, the release plate is provided with a plurality of fixing members, which are respectively disposed on both sides of the release groove. The release member is located between the plurality of fixing members such that it is positioned in the release groove, and the release member rotates around the fixing members.

[0012] Preferably, one end of the release member corresponding to the release groove is provided with an arc-shaped structure. The arc-shaped structure on the release member abuts against the magnetic yoke. When the release member is rotated, the arc-shaped structure pushes or releases the magnetic yoke.

[0013] Preferably, when the release member rotates to the first angle, the release member abuts against the magnetic yoke, and the release rod pulls the armature to move toward the magnetic yoke. At this time, the armature disengages from the brake disc. When the release member rotates to the second angle, the release member disengages from the magnetic yoke, and the armature moves toward the brake disc under elastic action. At this time, the armature limits the brake disc.

[0014] Preferably, a fixing groove is provided on the side of the magnetic yoke facing the armature, and an elastic element is provided in the fixing groove, the elastic element abutting against the armature.

[0015] Preferably, the fixing element includes a screw and a nut, and the release element is mounted on the release plate by the screw and nut.

[0016] Preferably, a first through hole is provided on the magnetic yoke corresponding to the position of the release rod, and the release rod is located in the first through hole; The armature has a second through hole at the position corresponding to the release rod, and the release rod is located in the second through hole; A fixing nut is provided at one end of the release rod, and the armature is limited by the fixing nut.

[0017] Preferably, there are two release rods, and the line connecting the positions of the two release rods passes through the center of the armature and the yoke.

[0018] Preferably, the device further includes a spacer and a limiting screw. The brake disc includes a cover plate, which is connected to the magnetic yoke via the limiting screw. The spacer is sleeved outside the limiting screw. The armature has a guide hole, and the spacer is located inside the guide hole. The spacer abuts against the magnetic yoke through the guide hole. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of a cam-release lawnmower brake according to an embodiment of the present invention; Figure 2 This is an exploded view of the overall structure of a cam-release lawnmower brake according to an embodiment of the present invention. Figure 3 This is a partial cross-sectional view of the cam-release lawnmower brake according to an embodiment of the present invention. Figure 1 ; Figure 4 This is a schematic diagram of the explosive structure of the release device according to an embodiment of the present invention; Figure 5 This is a partial cross-sectional view of the cam-release lawnmower brake according to an embodiment of the present invention. Figure 2 ; Figure 6 This is a partial cross-sectional view of the cam-release lawnmower brake according to an embodiment of the present invention. Figure 3 .

[0021] Explanation of reference numerals in the attached figures: 100. Magnetic yoke; 110. Fixing groove; 120. Elastic element; 130. First through hole; 140. O-ring; 150. Release washer; 200. Armature; 210. Second through hole; 220. Guide hole; 300. Brake disc; 400. Release device; 410. Release rod; 411. Fixing nut; 420. Release plate; 430. Release component; 431. Arc-shaped structure; 440. Release groove; 450. Fixing component; 451. Screw; 452. Nut; 500. Cover plate; 600. Spacer; 610. Limiting screw. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings showing multiple embodiments according to this application. It should be understood that the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments described in this application without creative effort will fall within the scope of protection of this application.

[0023] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing specific embodiments only and is not intended to limit this application; the terms "comprising," "including," "having," "containing," etc., in the description, claims, and accompanying drawings of this application are open-ended terms. Therefore, "comprising," "including," or "having" refers to, for example, a method or apparatus having one or more steps or elements, but is not limited to having only these one or more elements. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0024] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element 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 utility model.

[0025] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" 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 according to the specific circumstances.

[0026] It should be emphasized that when the term "comprising / including" is used in this specification, it is used to explicitly indicate the presence of the stated feature, integer, step, or component, but does not exclude the presence or addition of one or more other features, integers, steps, parts, or groups of features, integers, steps, or parts.

[0027] like Figures 1 to 4 As shown in the figure, a cam-release lawnmower brake provided in this embodiment of the present invention includes a magnetic yoke 100, an armature 200 and a brake disc 300. The magnetic yoke 100 is provided with a release device 400, and the release device 400 is provided with a release rod 410. The magnetic yoke 100 and the armature 200 are connected to the release device 400 through the release rod 410. When the release device 400 is rotated, the release rod 410 drives the magnetic yoke 100 to move toward or away from the brake disc 300, so as to fix or release the brake disc 300.

[0028] In the above structure, when manual brake release is required, the release device 400 is rotated, the release rod 410 moves accordingly, and drives the magnetic yoke 100 to move away from the brake disc 300. Since both the magnetic yoke 100 and the armature 200 are connected to the release device 400, this movement of the magnetic yoke 100 indirectly or directly forces the armature 200 to disengage from the brake disc 300 along with it, thereby releasing the clamping force on the brake disc 300 and realizing brake release. At this time, the motor spindle can rotate freely.

[0029] When the release device 400 is rotated in the reverse direction to the initial position, the release rod 410 drives the magnetic yoke 100 to move and reset towards the brake disc 300, and the armature 200 presses against the brake disc 300, generating braking torque again, so that the brake disc 300 is fixed.

[0030] This brake has a simple and compact structure. Its cam-type release device 400 allows for flexible switching between manual release and automatic braking. Compared to traditional electromagnetic brakes, this invention eliminates the need for complex lever or threaded rod systems, reducing the number of parts and assembly steps, thereby lowering manufacturing costs and improving reliability.

[0031] In this embodiment, the release device 400 includes a release plate 420 and a release member 430. The release plate 420 is disposed on the magnetic yoke 100 at a position relative to the armature 200. The release member 430 is rotatably disposed on the release plate 420. A release groove 440 is provided on the release plate 420 corresponding to the position of the release member 430. When the release member 430 is rotated, the release member 430 abuts against the magnetic yoke 100 through the release groove 440 or the release member 430 disengages from the magnetic yoke 100.

[0032] The release device 400 specifically comprises a release plate 420 and a release member 430. The release plate 420 is fixed to the side of the magnetic yoke 100 facing away from the armature 200. The release member 430 interacts with the magnetic yoke 100 through a release groove 440 formed on the release plate 420. Rotating the release member 430 causes it to move within the release groove 440 and abut against the magnetic yoke 100, thereby converting the rotational motion into a pushing motion against the magnetic yoke 100.

[0033] During the process of the release member 430 abutting against the magnetic yoke 100, the release plate 420 is restricted by the release rod 410, causing the release rod 410 to drive the armature 200 to move towards the magnetic yoke 100. At this time, the armature 200 gradually disengages from the brake disc 300, and the brake disc 300 loses the clamping force of the armature 200 and is in a released state, allowing the lawnmower to move freely for maintenance, adjustment, and other work. When the release member 430 is rotated in the opposite direction, it moves within the release groove 440 and gradually disengages from the magnetic yoke 100. At this time, the armature 200 moves towards the brake disc 300 under the action of the elastic member 120, and the armature 200 re-clamps the brake disc 300, restoring the braking function and preventing the lawnmower from slipping. This method of manually releasing and braking the brake through a cam release structure is convenient to operate, requiring only the rotation of the release member 430, without the need for complex lever or threaded push rod systems.

[0034] In this embodiment of the application, the release plate 420 is provided with a plurality of fixing members 450, the plurality of fixing members 450 are respectively disposed on both sides of the release groove 440, and the release member 430 is located between the plurality of fixing members 450, such that the release member 430 is located in the position of the release groove 440, and the release member 430 rotates around the fixing members 450.

[0035] These fasteners 450 are distributed on both sides of the release groove 440, constraining the release member 430 in the position of the release groove 440, so that it can only rotate on the axis formed by the fasteners 450 and will not fall off. The design of multiple fasteners 450 ensures the stable rotation of the release member 430 in the release groove 440, and will not be offset or fall off due to vibration or external force.

[0036] Preferably, in this embodiment of the application, two fasteners 450 are provided, and the two fasteners 450 are respectively provided on both sides of the release groove 440.

[0037] In this embodiment of the application, one end of the release member 430 corresponding to the release groove 440 is provided with an arc-shaped structure 431. The arc-shaped structure 431 on the release member 430 abuts against the magnetic yoke 100. When the release member 430 is rotated, the arc-shaped structure 431 pushes the magnetic yoke 100 or releases the magnetic yoke 100.

[0038] During rotation, the arc-shaped structure 431 at the end of the release member 430 maintains a smooth transition with the contact surface of the magnetic yoke 100. This design not only reduces frictional resistance, making operation easier, but also effectively avoids structural damage caused by sharp edges and corners, extending the service life of the brake. When the release member 430 rotates to the position of abutting the magnetic yoke 100, the arc-shaped structure 431 can evenly distribute the pushing force, ensuring the smooth movement of the magnetic yoke 100 and preventing deformation due to excessive local force. When the release member 430 rotates in the opposite direction to disengage from the magnetic yoke 100, the arc-shaped structure 431 can smoothly slide away from the contact surface, preventing jamming. This abutment design with the arc-shaped structure 431 at its core significantly improves the reliability and operational comfort of the manual release function of the brake by optimizing the force transmission path.

[0039] In this embodiment, when the release member 430 rotates to the first angle, the release member 430 abuts against the magnetic yoke 100, and the release rod 410 pulls the armature 200 to move toward the magnetic yoke 100. At this time, the armature 200 disengages from the brake disc 300. When the release member 430 rotates to the second angle, the release member 430 disengages from the magnetic yoke 100, and the armature 200 moves toward the brake disc 300 under elastic action. At this time, the armature 200 limits the brake disc 300.

[0040] In the above structure, the brake has two working states. In the first working state, when the release member 430 rotates to the first angle, the arc-shaped structure 431 on the release member 430 pushes the magnetic yoke 100. The arc-shaped structure 431 presses against the magnetic yoke 100 and overcomes the spring force through the release rod 410, causing the armature 200 to be pulled away from the brake disc 300, thus achieving the release state. When the release member 430 rotates to the second angle, the arc-shaped structure 431 on the release member 430 rotates to another angle, releasing its contact with the magnetic yoke 100, causing the arc-shaped structure 431 to disengage from the magnetic yoke 100. The armature 200 is reset under the push of the elastic member 120, pressing the brake disc 300, thus achieving the braking effect.

[0041] This dual-station design allows for brake release and braking switching via a simple rotation operation, eliminating the need for additional tools or complex procedures and significantly improving maintenance efficiency. Furthermore, the contact surface between the release component 430 and the magnetic yoke 100 features a rounded transition structure, ensuring uniform distribution of the thrust force while preventing structural wear caused by rigid collisions, thus extending the brake's service life.

[0042] In this embodiment of the application, a fixing groove 110 is provided on the side of the magnetic yoke 100 facing the armature 200, and an elastic element 120 is provided in the fixing groove 110, the elastic element 120 abutting against the armature 200.

[0043] The elastic element 120 is a compression spring, one end of which is fixed to the bottom of the fixing groove 110 of the magnetic yoke 100, and the other end directly abuts against the corresponding surface of the armature 200. When the brake is in the braking state, the compression spring is in a naturally extended state, continuously applying a pushing force towards the brake disc 300 to the armature 200, ensuring that the brake disc 300 is reliably pressed. When the release element 430 rotates to the first angle, the release rod 410 drives the armature 200 to compress the spring, putting it in an energy storage state. At this time, the brake disc 300 is released. This design realizes the automatic switching between braking and release states through the conversion of the spring's elastic potential energy, which not only ensures the reliability of braking but also reduces the force required for manual operation. At the same time, the positioning function of the fixing groove 110 on the spring prevents the spring from shifting during long-term use, further improving the stability of the brake.

[0044] In this embodiment, the fixing member 450 includes a screw 451 and a nut 452, and the releasing member 430 is mounted on the releasing plate 420 by the screw 451 and the nut 452.

[0045] After the screw 451 passes through the preset holes on the release element 430 and the release plate 420, it is tightened and fixed by the nut 452 on the other side. This installation method ensures a reliable connection between the release element 430 and the release plate 420, and facilitates disassembly and adjustment during subsequent maintenance. The combination of screw 451 and nut 452 is simple and inexpensive, meeting the economic requirements of the overall brake design. At the same time, by controlling the tightening force of the nut 452, the rotational damping of the release element 430 can be finely adjusted, ensuring that it can rotate flexibly during operation without producing abnormal noise due to loosening. In addition, this fixing method also has good vibration resistance, maintaining the stable position of the release element 430 even if it is bumpy during the transport or operation of the lawnmower, avoiding brake failure due to structural loosening.

[0046] In this embodiment, the magnetic yoke 100 has a first through hole 130 corresponding to the position of the release rod 410, and the release rod 410 is located in the first through hole 130; the armature 200 has a second through hole 210 corresponding to the position of the release rod 410, and the release rod 410 is located in the second through hole 210; a fixing nut 411 is provided at one end of the release rod 410, and the armature 200 is limited by the fixing nut 411.

[0047] The release rod 410 passes through the first through hole 130 of the magnetic yoke 100 and the second through hole 210 of the armature 200. Its end is axially limited by a fixing nut 411, ensuring that the release rod 410 does not move axially during transmission. This double-hole positioning structure not only improves the installation accuracy of the release rod 410 but also effectively disperses stress during transmission, preventing structural deformation caused by excessive local stress. When the release component 430 rotates, the release rod 410 moves linearly within the through hole, its trajectory strictly constrained, thus ensuring the synchronization of displacement between the magnetic yoke 100 and the armature 200. The fixing nut 411 adopts an anti-loosening design, maintaining a reliable connection even under vibration, preventing brake failure due to loosening of the nut 452. Furthermore, the inner wall of the through hole is precision-machined, maintaining an appropriate clearance fit with the release rod 410, ensuring smooth movement and effectively preventing dust or foreign objects from entering and affecting transmission efficiency. This limiting system, which consists of a through hole and a fixing nut 411, achieves high-precision transmission control with a simple structure, significantly improving the overall reliability of the brake.

[0048] In this embodiment of the application, two release rods 410 are provided, and the line connecting the positions of the two release rods 410 passes through the center of the armature 200 and the magnetic yoke 100.

[0049] In this embodiment of the application, an O-ring 140 and a release pad 150 are also provided in the first through hole 130 on the magnetic yoke 100. The O-ring 140 and the release pad 150 are sleeved on the release rod 410, so that a sealing structure is formed in the first through hole 130 to prevent rainwater from entering the brake through the first through hole 130.

[0050] Two release rods 410 are symmetrically distributed on the line connecting the center of the armature 200 and the magnetic yoke 100. When the release component 430 rotates, the two release rods 410 move synchronously, applying equal and opposite pushing forces to the magnetic yoke 100, ensuring smooth movement of the magnetic yoke 100 and preventing tilting or jamming caused by unilateral force. Simultaneously, this symmetrical structure effectively disperses stress, preventing structural deformation caused by localized stress concentration and extending the service life of the connection between the release rods 410 and the magnetic yoke 100.

[0051] In this embodiment, a spacer 600 and a limiting screw 610 are also included. The brake disc 300 includes a cover plate 500, which is connected to the magnetic yoke 100 via the limiting screw 610. The spacer 600 is sleeved outside the limiting screw 610. The armature 200 has a guide hole 220, and the spacer 600 is located within the guide hole 220, abutting against the magnetic yoke 100 through the guide hole 220. The spacer 600 is made of wear-resistant material, and its outer diameter forms a precision clearance fit with the inner diameter of the guide hole 220. This ensures the guiding accuracy of the armature 200 during axial movement of the magnetic yoke 100 and effectively reduces wear caused by direct metal-to-metal contact. After the limiting screw 610 passes through the threaded holes of the cover plate 500 and the magnetic yoke 100, the cover plate 500 is fixed to the end face of the magnetic yoke 100 by a preload. At this time, the spacer 600 is compressed between the armature 200 guide hole 220 and the surface of the magnetic yoke 100, forming an elastic buffer layer. When the brake is working, when the armature 200 presses against the brake disc 300 under the action of the elastic element 120, the spacer 600 can absorb part of the impact energy and reduce structural vibration; while when the release element 430 moves to disengage the armature 200 from the brake disc 300, the spacer 600 can prevent the armature 200 from excessively rebounding due to inertia. This combination design of the spacer 600 and the limiting screw 610 significantly improves the structural stability of the brake during frequent braking and release processes through the dual effects of physical isolation and elastic buffering.

[0052] The above-disclosed embodiments are only a few specific examples of the present utility model. However, the embodiments of the present utility model are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the protection scope of the present utility model.

Claims

1. A cam-release lawnmower brake, characterized in that, It includes a magnetic yoke (100), an armature (200), and a brake disc (300); The magnetic yoke (100) is provided with a release device (400), and the release device (400) is provided with a release rod (410). The magnetic yoke (100) and the armature (200) are connected to the release device (400) through the release rod (410). When the release device (400) is rotated, the release rod (410) drives the magnetic yoke (100) to move toward or away from the brake disc (300) in order to fix or release the brake disc (300).

2. The cam-release lawnmower brake according to claim 1, characterized in that, The release device (400) includes: A release plate (420) is provided on the magnetic yoke (100) on one side relative to the armature (200); A release member (430) is rotatably mounted on the release plate (420). A release groove (440) is provided on the release plate (420) corresponding to the position of the release member (430). When the release member (430) is rotated, the release member (430) abuts against the magnetic yoke (100) through the release groove (440) or the release member (430) disengages from the magnetic yoke (100).

3. The cam-release lawnmower brake according to claim 2, characterized in that, The release plate (420) is provided with a plurality of fixing members (450), which are respectively located on both sides of the release groove (440). The release member (430) is located between the plurality of fixing members (450), so that the release member (430) is located in the release groove (440) and the release member (430) rotates on the fixing members (450).

4. A cam-release lawnmower brake according to claim 3, characterized in that, The release member (430) is provided with an arc-shaped structure (431) at one end corresponding to the release groove (440). The arc-shaped structure (431) on the release member (430) abuts against the magnetic yoke (100). When the release member (430) is rotated, the arc-shaped structure (431) pushes the magnetic yoke (100) or releases the magnetic yoke (100).

5. A cam-release lawnmower brake according to claim 4, characterized in that, When the release member (430) rotates to the first angle, the release member (430) abuts against the magnetic yoke (100), and the release rod (410) pulls the armature (200) to move toward the magnetic yoke (100). At this time, the armature (200) disengages from the brake disc (300). When the release member (430) rotates to the second angle, the release member (430) disengages from the magnetic yoke (100), and the armature (200) moves toward the brake disc (300) under elastic action. At this time, the armature (200) limits the brake disc (300).

6. A cam-release lawnmower brake according to claim 5, characterized in that, A fixing groove (110) is provided on the side of the magnetic yoke (100) facing the armature (200), and an elastic element (120) is provided in the fixing groove (110), which abuts against the armature (200).

7. A cam-release lawnmower brake according to claim 4, characterized in that, The fastener (450) includes a screw (451) and a nut (452), and the release element (430) is mounted on the release plate (420) by the screw (451) and the nut (452).

8. A cam-release lawnmower brake according to claim 1, characterized in that, The magnetic yoke (100) has a first through hole (130) at the position corresponding to the release rod (410), and the release rod (410) is located in the first through hole (130); The armature (200) has a second through hole (210) at the position corresponding to the release rod (410), and the release rod (410) is located in the second through hole (210); A fixing nut (411) is provided at one end of the release rod (410), and the armature (200) is limited by the fixing nut (411).

9. A cam-release lawnmower brake according to claim 8, characterized in that, There are two release rods (410), and the line connecting the positions of the two release rods (410) passes through the center of the armature (200) and the magnetic yoke (100).

10. A cam-release lawnmower brake according to claim 1, characterized in that, It also includes a spacer (600) and a limiting screw (610). The brake disc (300) includes a cover plate (500), which is connected to the magnetic yoke (100) through the limiting screw (610). The spacer (600) is sleeved outside the limiting screw (610). The armature (200) is provided with a guide hole (220), and the spacer (600) is located inside the guide hole (220). The spacer (600) abuts against the magnetic yoke (100) through the guide hole (220).

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