A floating blade disc for a garden lawn mower and its adjustment method

Abstract

This invention provides a floating cutter head for a garden lawnmower and its adjustment method. The floating cutter head specifically includes a cutter head body movably mounted at the bottom of the frame body. A blade drive wheel is rotatably mounted on the bottom of the cutter head body along the vertical axis. A reversing wheel is installed inside the cutter head body. A gasoline engine, a clutch timing pulley arranged along the horizontal axis, and a timing belt are mounted on the frame body. The timing belt engages with the blade drive wheel after being vertically reversed by the reversing wheel. During height adjustment, the cutter head body drives the reversing wheel to move upwards or downwards along the vertical axis, simultaneously causing the blade drive wheel to move away from or towards the reversing wheel in the horizontal axis direction. The displacement of the reversing wheel in the horizontal axis direction is zero. This invention achieves both power reversal output and cutter head height adjustment without tightening or loosening the timing belt, thus avoiding the impact of height adjustment on the timing belt's lifespan. Height adjustment is achieved through the oscillation of the cutter head body.

Description

Technical Field

[0001] This invention relates to the field of lawnmower technology, and in particular to a floating blade disc for a garden lawnmower and its adjustment method. Background Technology

[0002] A lawnmower is a type of garden machinery used for trimming lawns, vegetation, etc. It is also known as a weed cutter, lawn mower, or lawn trimmer. It consists of a blade disc mounted on a frame, an engine, a walking mechanism, blades, and a handle. The blades rotate on the blade disc and are driven by the engine, which in turn powers the wheels.

[0003] The applicant addressed the issue of existing horizontal-axis gasoline engines being incompatible with garden lawnmowers. For example, regarding the published Chinese invention patent with application number "CN202110061405.6" entitled "A Hybrid Ride-on Lawnmower," the internal combustion engine is located behind the seat assembly, and its output shaft is vertically oriented. Because horizontal-axis gasoline engines, such as those used in snowplows, cannot be universally applied to lawnmowers, the applicant developed a lawnmower with a horizontal-axis gasoline engine layout. This design utilizes a single timing belt to achieve power reversal in different directions. Simultaneously, addressing the lack of blade height adjustment in this lawnmower, the applicant developed a floating blade design using a horizontal-axis gasoline engine layout. This design achieves blade height adjustment without pulling or loosening the timing belt, thus preserving its lifespan. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] The problem to be solved by the present invention is to provide a floating blade for a garden lawn mower and an adjustment method thereon, so as to overcome the defects in the prior art.

[0006] (II) Technical Solution

[0007] To address the aforementioned technical problem, this invention provides a floating blade disc for a garden lawnmower, comprising a blade disc body movably mounted at the bottom of a frame body, a blade drive wheel rotatably mounted at the bottom of the blade disc body along a vertical axis; a reversing wheel is mounted inside the blade disc body; a gasoline engine is mounted on the frame body; a clutch synchronous pulley and a synchronous belt are rotatably mounted on the gasoline engine along a horizontal axis, the synchronous belt engaging with the clutch synchronous pulley; the synchronous belt, after being twisted and reversing perpendicularly by the reversing wheel, engages with the blade drive wheel, the twist angle of the synchronous belt being 90 degrees; the clutch synchronous pulley is mounted on the gasoline engine via an electromagnetic clutch;

[0008] The reversing wheel is movably mounted on the cutter head body; the cutter head body has a height limit position and a low limit position. During the process of switching from the height limit position to the low limit position, the reversing wheel is driven to move downward along the vertical axis, and the blade drive wheel is driven to move towards the reversing wheel in the horizontal axis direction. The displacement of the reversing wheel in the horizontal axis direction is zero.

[0009] In some embodiments, the displacement of the reversing wheel in the vertical axis direction is close to the displacement of the blade drive wheel in the horizontal axis direction.

[0010] In some embodiments, the cutter head body is pivotally hinged to the bottom of the frame body, and the height adjustment limit position is located diagonally above the low adjustment limit position; the frame body is provided with a limiting member extending along the vertical axis, the limiting member being configured to guide the reversing wheel to move in the vertical axis direction; a guide seat that can slide along the horizontal axis direction is movably mounted on the cutter head body, the reversing wheel is rotatably mounted on the guide seat, and the guide seat and the limiting member slide vertically together.

[0011] In some embodiments, the cutter head body is provided with a guide groove extending along the horizontal axis, and the guide seat is slidably installed in the guide groove. The guide seat is configured to drive the blade drive wheel synchronously toward or away from the reversing wheel in the horizontal axis direction during the swing adjustment of the cutter head body.

[0012] In some embodiments, the limiting member is a guide flange, and at least two oppositely arranged guide sliders are provided on the outer side of the guide seat, with a sliding groove formed between two adjacent guide sliders that slides with the guide flange along the vertical axis.

[0013] In some embodiments, the cutter head body is fixedly provided with a mounting bracket, the guide groove is provided on the mounting bracket, and the guide slider is slidably engaged with the guide groove; during the process of the cutter head body swinging up or down, the mounting bracket slides relative to the guide slider, so that the blade drive wheel synchronously moves away from or towards the reversing wheel.

[0014] In some embodiments, a control unit is also installed on the frame body, the control unit being configured to raise or lower the cutter head body as a whole; the control unit includes a drive member hinged to the frame body, the cutter head body being hinged to the bottom of the frame body via a connecting rod assembly; the drive member drives the connecting rod assembly to swing through the drive rod assembly, causing the cutter head body to swing obliquely upwards or downwards for adjustment.

[0015] In some embodiments, the connecting rod, the cutter head body, and the frame body form a parallelogram structure, the connecting rod group includes a first connecting rod and a second connecting rod; the drive rod group includes a first drive rod and a second drive rod respectively eccentrically hinged to the drive member.

[0016] In some embodiments, the control unit is manually controlled, a control handle is mounted on the drive unit, and a gear position seat corresponding to the control handle is mounted on the frame body.

[0017] In some embodiments, the bottom of the cutter head body is provided with a mowing chamber and a blade, and a connecting seat connected to the blade and the blade drive wheel is installed in the cutter head body. The synchronous belt is provided with a fixed tension wheel and a floating tension wheel on one side of the blade drive wheel. The floating tension wheel is hinged to the connecting seat via a tension wheel hinge rod, and a spring is hooked between the other end of the tension wheel hinge rod and the cutter head body.

[0018] This specification also provides an embodiment of a method for adjusting a floating blade disc of a garden lawnmower, which is basically implemented according to any embodiment of this specification. During the process of adjusting the blade disc body by swinging the control unit to raise or lower it, the reversing wheel moves vertically upward or downward in the vertical axis direction, and the blade drive wheel moves away from or towards the reversing wheel in the horizontal axis direction at the same time. The displacement of the reversing wheel in the horizontal axis direction is always zero.

[0019] Switching the cutter head body from the high limit position to the low limit position includes the following steps:

[0020] Step S001: The cutter head body is tilted downwards by the control unit.

[0021] In step S002, the reversing wheel is restricted by the limiting component on the frame body and moves downward along the vertical axis, simultaneously pressing down the timing belt to move downward;

[0022] In step S003, during the swinging process of the cutter head body, the blade drive wheel is synchronously driven to move towards the reversing wheel along the horizontal axis until it enters the lower limit position.

[0023] In some embodiments, in step S001, the first drive rod and the second drive rod are driven by the drive member of the control unit, so that the entire cutter head body swings downward around the two hinge points of the first connecting rod and the second connecting rod on the frame body.

[0024] In some embodiments, in step S002, the limiting member is a guide flange extending in the vertical direction; the sliding groove formed on the outer side of the guide seat slides in correspondence with the guide flange; in step S003, the guide groove of the cutter head body slides relative to the guide slider on the outer side of the guide seat, driving the blade drive wheel to move towards the reversing wheel synchronously; during the process of the cutter head body switching from the height limit position to the height limit position, the displacement of the reversing wheel in the vertical axis direction approaches the displacement of the blade drive wheel in the horizontal axis direction.

[0025] (III) Beneficial Effects

[0026] This invention provides a floating blade disc for a garden lawn mower and its adjustment method, which has the following advantages compared to existing technologies: 1) During the blade disc height adjustment process, the timing belt will not be pulled in or loosened, ensuring both machine operation and the lifespan of the timing belt; 2) This invention is based on a single timing belt for power reversal output. During the upward or downward swing of the blade disc body, its reversing wheel can only slide up and down along the vertical axis, achieved through the sliding groove on the guide seat side of the reversing wheel and the limiting component of the frame body; furthermore, during the upward or downward swing of the blade disc body, the blade drive wheel can move closer to or further away from the reversing wheel, achieved through the sliding groove on the frame body and the guide slider on the guide seat side; 3) The blade disc body is hinged and oscillated at the lower end of the frame body using a parallelogram principle. The oscillation of the drive component of the control unit controls the oscillation of the drive rod group and connecting rod group, thereby driving the blade disc body to adjust its height relative to the frame body. The adjustment method is simple, and the parallelogram principle structure is stable and reliable. Attached Figure Description

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0028] Figure 1 This is a perspective view of the invention after it has been installed on a lawnmower;

[0029] Figure 2 This is a schematic diagram of the cutter head body of the present invention when it is in the height limit position;

[0030] Figure 3 This is a schematic diagram of the cutter head body of the present invention when it is in the lower limit position;

[0031] Figure 4This is a perspective view of the gasoline engine and timing belt portion of the present invention;

[0032] Figure 5 This is a perspective view of the cutter head body of the present invention;

[0033] Figure 6 This is a perspective view of the synchronous belt torsional reversal of the present invention;

[0034] Figure 7 This is a state switching diagram of the present invention when moving from the height limit position to the low limit position;

[0035] Figure 8 This is a perspective view of the guide seat and mounting bracket when the present invention is in the height adjustment limit position;

[0036] Figure 9 This is a perspective view of the guide seat of the present invention;

[0037] Figure 10 This is a perspective view of the mounting bracket of the present invention;

[0038] Figure 11 This is a perspective view of the guide seat and mounting bracket when the present invention is in the lowest adjustment limit position;

[0039] Figure 12 This is a perspective view of the frame body and the limiting member of the present invention;

[0040] Figure 13 This is a perspective view of the control unit of the present invention;

[0041] Figure 14 This is a perspective view of the control unit of the present invention when it is in the lowest adjustment position;

[0042] Figure 15 This is a physical prototype drawing of the lawnmower of the present invention;

[0043] The component names corresponding to the various labels in the figure are as follows: 1. Frame body; 2. Cutter head body; 3. Blade; 4. Reversing wheel; 5. Blade drive wheel; 6. Gasoline engine; 7. Clutch timing pulley; 8. Timing belt; 9. Limiting component; 10. Guide seat; 11. Guide slider; 12. Sliding groove; 13. Mounting bracket; 14. Guide groove; 15. Control unit; 16. Gear seat; 17. Connecting seat; 18. Fixed tension wheel; 19. Floating tension wheel; 20. Tension wheel hinge rod; 21. Spring; 22. Electromagnetic clutch; 201. Mowing chamber; 1501. Drive component; 1502. First connecting rod; 1503. Second connecting rod; 1504. First drive rod; 1505. Second drive rod; 1506. Control handle. Detailed Implementation

[0044] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0045] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0046] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0047] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0048] Additionally, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that practice can be carried out without these specific details.

[0049] The technical solutions provided by the various embodiments of this application are described below with reference to the accompanying drawings.

[0050] See Figures 1 to 15This invention provides a floating blade disc for a garden lawn mower, comprising a blade disc body 2 movably mounted on a frame body 1. A blade drive wheel 5 is rotatably mounted on the bottom of the blade disc body 2 along a vertical axis. Specifically, the bottom of the blade disc body 2 has a mowing chamber 201 and blades 3, with the blades 3 synchronously connected to the blade drive wheel 5. A reversing wheel 4 is installed inside the blade disc body 2. A gasoline engine 6 is mounted on the frame body 1. The gasoline engine 6 is rotatably mounted with a clutch timing pulley 7 arranged along a horizontal axis and a timing belt 8 that meshes with the clutch timing pulley 7. An electromagnetic clutch 22 is installed on the engine 6. The electromagnetic clutch 22 has a clutch timing pulley 7, which is coaxially mounted with the output shaft of the gasoline engine 6 (located along the horizontal axis). The rotation of the clutch timing pulley 7 is controlled by the electromagnetic clutch 22, thereby controlling the rotation of the blade 3. The timing belt 8, after being twisted and vertically reversed by the reversing pulley 4, engages with the blade drive wheel 5, achieving power reversal through the same timing belt 8. The reversing pulley 4 transmits the output power of the gasoline engine 6 to the blade drive wheel 5 at the bottom. Figure 6 and Figure 7 The twist angle of synchronous belt 8 is 90 degrees.

[0051] Combination Figure 7 The reversing wheel 4 will reverse the timing belt 8 at a 90-degree right angle.

[0052] In this specification, the horizontal axis is the horizontal direction, and the vertical axis is the vertical direction; refer to the appendix for details. Figure 1 In this embodiment, the axis of the clutch synchronization wheel 7 is the horizontal X-axis (along the front-to-back direction of the lawnmower), the axis of the blade drive wheel 5 is the vertical Z-axis (along the up-down direction of the lawnmower), and the axis of the reversing wheel 4 is the horizontal Y-axis (along the left-to-right direction of the lawnmower).

[0053] The reversing wheel 4 is movably mounted on the cutter head body 2. The cutter head body 2 has a high limit position and a low limit position. During the process of switching from the high limit position to the low limit position, the reversing wheel 4 is driven to move downward along the vertical axis, and simultaneously the blade drive wheel 5 is driven to move towards the reversing wheel 4 in the horizontal axis direction (the cutter head body 2 is oscillatingly hinged to the bottom of the frame body 1, so during the downward swing of the cutter head body 2, the blade drive wheel 5 will move towards the reversing wheel 4; from the Y-axis direction, the movement trajectory of the blade drive wheel 5 tends to be a 45-degree downward diagonal translational movement), and the displacement of the reversing wheel 4 in the horizontal axis direction is zero. Similarly, during the process of switching from the low limit position to the high limit position, the reversing wheel 4 is driven to move upward along the vertical axis, and simultaneously the blade drive wheel 5 is driven away from the reversing wheel 4 in the horizontal axis direction, and the displacement of the reversing wheel 4 in the horizontal axis direction is always zero.

[0054] In actual use, the lawnmower adjusts the cutting height by adjusting the height of the cutter head 2 where the blades 3 are located. The clutch timing pulley 7 is rotatably mounted on the gasoline engine 6 and does not move in other directions. The blade drive wheel 5 where the blades 3 are located is rotatably mounted on the cutter head 2. The reversing pulley 4 is also movably mounted inside the cutter head body 2. Therefore, when adjusting the height of the cutter head 2, the engagement state of the timing belt 8 must be considered (it cannot be stretched or become slack). To achieve a better transmission state, the position of the reversing pulley 4 needs to be restricted.

[0055] In some embodiments, the cutter head body 2 is pivotally hinged to the bottom of the frame body 1, and the pivoting of the cutter head body 2 will drive the relative movement of the reversing wheel 4 and the blade drive wheel 5; the displacement of the reversing wheel 4 in the vertical axis direction is close to the displacement of the blade drive wheel 5 in the horizontal axis direction.

[0056] See Figure 4 Because the cutter head body 2 is oscillatingly mounted at the bottom of the frame body 1, its height adjustment limit position is located diagonally above the low adjustment limit position (this is achieved by oscillating the cutter head body 2 diagonally upwards when switching from the low adjustment limit position to the height adjustment limit position); the frame body 1 is provided with a limiting member 9 extending along the vertical axis, which is configured to guide the reversing wheel 4 to move in the vertical axis direction; a guide seat 10 that can slide along the horizontal axis direction is movably mounted on the cutter head body 2, and the reversing wheel 4 is rotatably mounted on the guide seat 10, with the guide seat 10 and the limiting member 9 sliding vertically in cooperation.

[0057] In some embodiments, the cutter head body 2 is provided with a guide groove 14 extending along the horizontal axis, and the guide seat 10 is slidably installed in the guide groove 14 (so that the reversing wheel 4 is movably installed on the cutter head body 2 along the horizontal axis). The guide seat 10 is configured to drive the blade drive wheel 5 to move towards or away from the reversing wheel 4 synchronously in the horizontal axis direction during the swing adjustment of the cutter head body 2 (the reversing wheel 4 can only move in the vertical direction along the limiting member 9).

[0058] In one example, see Figure 5 and Figure 10 The cutter head body 2 is fixedly provided with a mounting bracket 13, and the guide groove 14 is provided on the mounting bracket 13.

[0059] The cutter head body 2 in this embodiment is oscillatingly mounted at the bottom of the frame body 1. Therefore, during the oscillation process, the displacement of the reversing wheel 4 in the vertical axis direction is basically equal to the displacement of the blade drive wheel 5 in the horizontal axis direction. Thus, the floating adjustment structure in this embodiment ensures that the synchronous belt 8 will not be stretched or contracted, thereby avoiding affecting the service life of the synchronous belt.

[0060] In some embodiments, such as Figures 8-12As shown, the limiting member 9 is a guide flange, and at least two oppositely arranged guide sliders 11 are provided on the outer side of the guide seat 10. A sliding groove 12 is formed between two adjacent guide sliders 11, which slides and engages with the guide flange along the vertical axis. The guide sliders 11 and the guide grooves 14 slide and engage. During the process of swinging the cutter head body 2 to adjust its height or height, the mounting bracket 13 slides relative to the guide sliders 11, so that the blade drive wheel 5 moves away from or closer to the reversing wheel 4 synchronously.

[0061] It should be noted that the guide slider 11 of the guide seat 10 achieves sliding engagement with the limiting member 9 in the vertical direction and also achieves sliding engagement with the guide groove 14 in the horizontal direction. This ensures that during the swing adjustment of the cutter head body 2, the reversing wheel 4 on the guide seat 10 can only move along the vertical direction and cannot move in the horizontal direction, so that when the cutter head body 2 swings, it can drive the blade drive wheel 5 to synchronously move away from or towards the reversing wheel 4. Figure 6 and Figure 11 As shown, Figure 6 This is a perspective view of the reversing wheel 4 on the guide seat 10 when it is in the height limit position. Figure 11 This is a perspective view of the reversing wheel 4 on the guide seat 10 when it is in the lower limit position. It can be seen that the position of the guide slider 11 relative to the limiting member 9 and relative to the guide groove 14 are different.

[0062] In some embodiments, a control unit 15 is also installed on the frame body 1. The control unit 15 is configured to raise or lower the cutter head body 2 as a whole. It can be adjusted in electric mode (e.g., using a crank rocker structure driven by a motor, which will not be described in detail in this specification) or in manual mode.

[0063] Combination Figure 2 , Figure 3 , Figure 13 and Figure 14 The control unit 15 includes a drive component 1501 hinged to the frame body 1. The cutter head body 2 is hinged to the bottom of the frame body 1 via a connecting rod assembly. The drive component 1501 drives the connecting rod assembly to swing, so that the cutter head body 2 swings upward or downward at an angle.

[0064] In some embodiments, such as Figure 13 and Figure 14 As shown, the connecting rod, the cutter head body 2, and the frame body 1 form a parallelogram structure. The connecting rod group includes a first connecting rod 1502 and a second connecting rod 1503. The cutter head body 2 is hinged to the lower end of the frame body 1 through the first connecting rod 1502 and the second connecting rod 1503, which are arranged at the front and rear respectively. The drive rod group includes a first drive rod 1504 and a second drive rod 1505, which are respectively eccentrically hinged to the drive member 1501, and are used to drive the swing of the cutter head body 2.

[0065] In one example, such as Figure 13 As shown, the control unit 15 is manually controlled, the drive unit 1501 is equipped with a control handle 1506, and the frame body 1 is equipped with a gear seat 16 corresponding to the control handle 1506.

[0066] In some embodiments, such as Figure 6 As shown, a connecting seat 17 connected to the blade 3 and the blade drive wheel 5 is installed inside the cutter head body 2; a fixed tension wheel 18 and a floating tension wheel 19 are provided on one side of the blade drive wheel 5 on the synchronous belt 8. The floating tension wheel 19 is hinged to the connecting seat 17 via the tension wheel hinge rod 20. A spring 21 is hooked between the other end of the tension wheel hinge rod 20 and the cutter head body 2. Specifically, the spring 21 is hooked on the mounting bracket 13.

[0067] Based on the same inventive concept, this specification also provides an adjustment method for a floating blade disc of a garden lawnmower. The floating blade disc of the garden lawnmower is implemented based on any of the foregoing embodiments. During the process of adjusting the blade disc body 2 by swinging the control unit 15 to raise or lower the whole body, the reversing wheel 4 moves vertically upward or downward in the vertical axis direction. Simultaneously, the blade drive wheel 5 moves away from or towards the reversing wheel 4 in the horizontal axis direction. The displacement of the reversing wheel 4 in the horizontal axis direction is always zero.

[0068] The process of switching the cutter head body 2 from the height limit position to the low limit position includes the following steps: Step S001, the cutter head body 2 is controlled to swing downwards by the control unit 15; Step S002, the reversing wheel 4 is restricted by the limiting member 9 on the frame body 1 and moves downwards along the vertical axis, simultaneously pressing down the timing belt 8 to move downwards; Step S003, during the swinging process of the cutter head body 2, the blade drive wheel 5 is driven to move towards the reversing wheel 4 along the horizontal axis until it enters the low limit position.

[0069] In step S001, the first drive rod 1504 and the second drive rod 1505 are driven by the drive member 1501 of the control unit 15, so that the entire cutter head body 2 swings downward around the two hinge points of the first connecting rod 1502 and the second connecting rod 1503 on the frame body 1.

[0070] In step S002, the limiting member 9 is a guide flange extending in the vertical direction; the sliding groove 12 formed on the outer side of the guide seat 10 slides in accordance with the guide flange; in step S003, the guide groove 14 of the cutter head body 2 slides relative to the guide slider 11 on the outer side of the guide seat 10, and the whole drives the blade drive wheel 5 to move towards the reversing wheel 4 synchronously; during the process of the cutter head body 2 switching from the height limit position to the height limit position, the displacement of the reversing wheel 4 in the vertical axis direction is close to the displacement of the blade drive wheel 5 in the horizontal axis direction.

[0071] During the downward or upward swinging process of the cutter head body 2 in this specification, the guide slider 11 and the limiting member 9 can restrict the reversing wheel 4 to move downward or upward along the vertical axis (Z-axis direction). At the same time, the guide slider 11 and the guide groove 14 can synchronously drive the blade drive wheel 5 to move towards or away from the reversing wheel 4 along the horizontal axis (X-axis direction) during the aforementioned movement. Based on the power transmission in different directions through a single synchronous belt 8, the synchronous belt 8 will not be tightened or loosened during the up-and-down swinging process of the cutter head body 2, thus avoiding the impact of height adjustment on the service life of the synchronous belt.

[0072] The same or similar parts between the various embodiments in this specification can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments.

[0073] The above description is merely a specific embodiment of this application, but the scope of protection of this application 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 application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A floating blade disc for a garden lawn mower, comprising a blade disc body (2) movably mounted at the bottom of a frame body (1), characterized in that: The cutter head body (2) has a blade drive wheel (5) rotatably mounted at the bottom along the vertical axis. A reversing wheel (4) is installed inside the cutter head body (2). A gasoline engine (6) is mounted on the frame body (1). The gasoline engine (6) is rotatably mounted with a clutch synchronous wheel (7) arranged along the horizontal axis and a synchronous belt (8) that is driven and meshed with the clutch synchronous wheel (7). After being twisted and vertically reversed by the reversing wheel (4), the synchronous belt (8) is driven and meshed with the blade drive wheel (5). The reversing wheel (4) is movably mounted on the cutter head body (2); the cutter head body (2) has a height limit position and a low limit position. During the process of switching from the height limit position to the low limit position, the reversing wheel (4) is driven to move downward along the vertical axis, and the blade drive wheel (5) is driven to move towards the reversing wheel (4) in the horizontal axis direction. The displacement of the reversing wheel (4) in the horizontal axis direction is zero.

2. The floating blade disc of the garden lawnmower as described in claim 1, characterized in that: The twist angle of the synchronous belt (8) is 90 degrees; the displacement of the reversing wheel (4) in the vertical axis direction is close to the displacement of the blade drive wheel (5) in the horizontal axis direction. The cutter head body (2) is hinged to the bottom of the frame body (1), and the height limit position is located diagonally above the low limit position. The frame body (1) is provided with a limiting member (9) extending along the vertical axis. The limiting member (9) is configured to guide the reversing wheel (4) to move in the vertical axis direction. The cutter head body (2) is movably mounted with a guide seat (10) that can slide along the horizontal axis direction. The reversing wheel (4) is rotatably mounted on the guide seat (10). The guide seat (10) and the limiting member (9) slide vertically together.

3. The floating blade disc of the garden lawnmower as described in claim 2, characterized in that: The cutter head body (2) is provided with a guide groove (14) extending along the horizontal axis. The guide seat (10) is slidably installed in the guide groove (14). The guide seat (10) is configured to drive the blade drive wheel (5) to move towards or away from the reversing wheel (4) in the horizontal axis direction during the swing adjustment of the cutter head body (2). The limiting member (9) is a guide flange. At least two oppositely arranged guide sliders (11) are provided on the outside of the guide seat (10). A sliding groove (12) is formed between two adjacent guide sliders (11) that slides with the guide flange in the vertical axis direction.

4. The floating blade disc of the garden lawnmower as described in claim 3, characterized in that: The cutter head body (2) is fixedly provided with a mounting bracket (13), the guide groove (14) is provided on the mounting bracket (13), and the guide slider (11) slides in cooperation with the guide groove (14); during the process of the cutter head body (2) swinging up or down, the mounting bracket (13) slides relative to the guide slider (11), so that the blade drive wheel (5) moves away from or closer to the reversing wheel (4) synchronously.

5. The floating blade disc of the garden lawnmower as described in claim 4, characterized in that: The frame body (1) is also equipped with a control unit (15), which is configured to raise or lower the cutter head body (2) as a whole. The control unit (15) includes a drive member (1501) hinged to the frame body (1). The cutter head body (2) is hinged to the bottom of the frame body (1) through a connecting rod assembly. The drive member (1501) drives the connecting rod assembly to swing through the drive rod assembly, so that the cutter head body (2) swings upward or downward at an angle.

6. The floating blade disc of the garden lawnmower as described in claim 5, characterized in that: The connecting rod, the cutter head body (2) and the frame body (1) form a parallelogram structure. The connecting rod group includes a first connecting rod (1502) and a second connecting rod (1503). The drive rod group includes a first drive rod (1504) and a second drive rod (1505) that are respectively eccentrically hinged to the drive member (1501).

7. The floating blade disc of the garden lawnmower as described in claim 6, characterized in that: The control unit (15) is manually controlled. A control handle (1506) is installed on the drive unit (1501), and a gear seat (16) corresponding to the control handle (1506) is installed on the frame body (1).

8. The floating blade disc of the garden lawnmower as described in claim 7, characterized in that: The cutter body (2) has a cutting chamber (201) and a blade (3) at its bottom. The cutter body (2) has a connecting seat (17) that is connected to the blade (3) and the blade drive wheel (5). The synchronous belt (8) has a fixed tension wheel (18) and a floating tension wheel (19) on one side of the blade drive wheel (5).

9. A method for adjusting the floating blade of a garden lawnmower, based on the floating blade of the garden lawnmower as described in claim 8, characterized in that: During the process of adjusting the overall height or the height of the cutter head body (2) by the control unit (15), the reversing wheel (4) moves vertically upward or downward in the vertical axis direction, and the blade drive wheel (5) moves away from or closer to the reversing wheel (4) in the horizontal axis direction. The displacement of the reversing wheel (4) in the horizontal axis direction is always zero. The cutter head body (2) switches from the high limit position to the low limit position, including the following steps: Step S001: The cutter head body (2) is tilted downwards by the control unit (15); In step S002, the reversing wheel (4) is restricted by the limiting member (9) on the frame body (1) and moves downward along the vertical axis, simultaneously pressing down the timing belt (8) to move downward; In step S003, during the swinging process of the cutter head body (2), the blade drive wheel (5) is driven to move towards the reversing wheel (4) along the horizontal axis until it enters the lower limit position.

10. The method for adjusting the floating blade of a garden lawnmower as described in claim 9, characterized in that: In step S001, the first drive rod (1504) and the second drive rod (1505) are driven by the drive unit (15) of the control unit (15), so that the entire cutter head body (2) swings downward around the two hinge points of the first connecting rod (1502) and the second connecting rod (1503) on the frame body (1). In step S002, the limiting member (9) is a guide flange extending in the vertical direction; the sliding groove (12) formed on the outer side of the guide seat (10) is in sliding engagement with the guide flange. In step S003, the guide groove (14) of the cutter head body (2) slides relative to the guide slider (11) on the outside of the guide seat (10), and the whole drives the blade drive wheel (5) to move towards the reversing wheel (4) synchronously. During the process of the cutter head body (2) switching from the height limit position to the height limit position, the displacement of the reversing wheel (4) in the vertical axis direction is close to the displacement of the blade drive wheel (5) in the horizontal axis direction.

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