Grass trimmer head and grass trimmer including the grass trimmer head

Abstract

The present invention discloses a grass trimming head and a grass trimming machine including the grass trimming head, comprising: a grass trimming head for grass trimming; a driving mechanism, which can at least drive the grass trimming head to rotate along a first rotation direction with a rotating shaft axis as an axis; the grass trimming head comprises: a head shell; a winding disk, which is formed with a winding portion; a clutch mechanism, which is used to realize power transmission between the head shell and the winding disk; the clutch mechanism at least has a first state for making the head shell and the winding disk form a synchronous rotation, and a second state for allowing the winding disk to rotate relative to the head shell in a second rotation direction opposite to the first rotation direction; the clutch mechanism comprises: an elastic member, which can undergo elastic deformation, and the elastic member has at least a first form and a second form; when the clutch mechanism is in the first state, the elastic member is in the first form; when the clutch mechanism is in the second state, the elastic member is in the second form. The present invention can provide a grass trimming head with a small winding load and a grass trimming machine including the grass trimming head.

Description

Technical Field

[0001] The invention relates to a garden tool, in particular to a grass trimmer. Background Art

[0002] A lawn mower is a common garden tool. Its main principle is to use a motor or engine to drive its mowing head to rotate at high speed. The flexible cutting wire is wound on a winding drum, and the winding drum is accommodated in the mowing head. The end of the flexible cutting wire extends through a hole on the mowing head housing. When the mowing head rotates at high speed, the flexible cutting wire also rotates at high speed, thereby achieving the cutting effect.

[0003] When the flexible cutting line extending out of the grass trimmer head housing is broken or worn, a new cutting line must be released from the winding reel. There are currently manual release, tapping release and automatic release methods to achieve the release of the grass trimmer head. When the flexible cutting line on the winding reel is released, it is necessary to replenish the cutting line. The current winding methods mainly include automatic winding and manual winding: pass the cutting line through the winding reel, and then rotate the housing or the winding reel so that the cutting line is wound around the winding reel. This requires the housing to rotate relative to the winding reel, which requires overcoming the friction on the mating surface of the housing and the winding reel. The prior art uses a mechanical clutch structure on the mating surface, and most of them use a rigid clutch structure, which makes the user's load heavier when performing the winding operation, and the user's winding operation is very laborious, of course, it also greatly wastes the user's time, and greatly affects their work efficiency. Summary of the invention

[0004] In order to solve the deficiencies of the prior art, an object of the present invention is to provide a grass trimmer head that makes winding easier and more labor-saving, and a grass trimmer including the grass trimmer head.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A lawn mower comprises: a lawn mower head for mowing grass; a driving mechanism capable of at least driving the lawn mower head to rotate along a first rotation direction about a rotation axis; the lawn mower head comprises: a head shell; a winding disk formed with a winding portion; a clutch mechanism for realizing power transmission between the head shell and the winding disk; the clutch mechanism has at least a first state for making the head shell and the winding disk rotate synchronously, and a second state for allowing the winding disk to rotate relative to the head shell along a first rotation direction or a second rotation direction opposite to the first rotation direction; the clutch mechanism comprises: an elastic member capable of elastic deformation, and the elastic member has at least a first form and a second form; when the clutch mechanism is in the first state, the elastic member is in the first form; when the clutch mechanism is in the second state, the elastic member is in the second form.

[0007] Furthermore, the trimmer head further comprises: a biasing element, which generates a biasing force capable of at least driving the clutch mechanism to move toward the first state.

[0008] Furthermore, the biasing element can generate a biasing force at least in a direction parallel to the rotation axis; and the elastic member can be deformed at least in a direction parallel to the rotation axis during the process of changing from the first form to the second form.

[0009] Further, the biasing element is a coil spring arranged along the direction of the rotation axis or parallel to the direction of the rotation axis.

[0010] Furthermore, the lawn mower also includes: a biasing element, which generates a biasing force that can resist the winding reel or the head shell; when the clutch mechanism is in the second state, at least a part of the rotational torque applied to the winding reel or the head shell is used to resist the elastic force generated by the elastic member.

[0011] Furthermore, the lawn mower also includes: a biasing element, which generates a first biasing force that can resist the winding reel or the head shell when the clutch mechanism is in the second state; and the elastic member generates an elastic force that can resist the winding reel or the head shell when the clutch mechanism is in the second state.

[0012] Furthermore, the elastic member is integrally formed with the winding drum or the head shell.

[0013] Furthermore, the elastic member is arranged on the winding drum or the head shell.

[0014] Furthermore, the clutch mechanism also includes a matching piece for matching with the elastic piece to transmit power.

[0015] Furthermore, the elastic member is arranged in one of the winding drum or the head shell, and the matching member is arranged in the other of the winding drum and the head shell; the elastic member is formed with: a driving surface, which drives the matching member to rotate with the elastic member when the elastic member is in the first form; and an elastic surface, which allows the matching member to rotate relative to the elastic member when the elastic member is in the second form.

[0016] A grass trimmer head comprises: a head shell; a winding reel formed with a winding portion; a clutch mechanism for realizing power transmission between the head shell and the winding reel; the clutch mechanism has at least a first state for making the head shell and the winding reel rotate synchronously, and a second state allowing the winding reel to rotate relative to the head shell in a first rotation direction or in a second rotation direction opposite to the first rotation direction; the clutch mechanism comprises: an elastic member capable of elastic deformation, and the elastic member has at least a first form and a second form; when the clutch mechanism is in the first state, the elastic member is in the first form; when the clutch mechanism is in the second state, the elastic member is in the second form.

[0017] Furthermore, the trimmer head further comprises: a biasing element, which generates a biasing force capable of at least driving the clutch mechanism to move toward the first state.

[0018] Furthermore, the biasing element can generate a biasing force at least in a direction parallel to the rotation axis; and the elastic member can be deformed at least in a direction parallel to the rotation axis during the process of changing from the first form to the second form.

[0019] A lawn mower comprises: a lawn mower head for mowing grass; a driving mechanism capable of at least driving the lawn mower head to rotate along a first rotation direction with a rotation axis as an axis; the lawn mower head comprises: a head shell; a winding disk formed with a winding portion; a clutch mechanism for realizing power transmission between the head shell and the winding disk; the clutch mechanism has at least a first state for making the head shell and the winding disk rotate synchronously, and a second state for allowing the winding disk to rotate relative to the head shell along a second rotation direction opposite to the first rotation direction; the clutch mechanism comprises: a first magnetic component, arranged in one of the head shell or the winding disk; a second magnetic component, arranged in the other of the head shell or the winding disk; a magnetic force is formed between the first magnetic component and the second magnetic component; when the clutch mechanism is in the second state, the repulsive force between the first magnetic component and the second magnetic component is greater than the attractive force.

[0020] Furthermore, when the clutch mechanism is in the first state, the attraction force between the first magnetic component and the second magnetic component is greater than the repulsion force.

[0021] The benefit of the present invention lies in that the grass trimmer and its grass trimmer head of the present invention adopt a clutch structure that can be deformed between the shell and the winding reel, which greatly reduces the load during winding, making it easier and more labor-saving for users to wind the wire, thereby improving the practicality of the grass trimmer head. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of a grass trimmer according to a first embodiment of the present invention;

[0023] Figure 2 yes Figure 1 A three-dimensional diagram of a partial structure of a lawn mower;

[0024] Figure 3 yes Figure 1 An exploded view of the partial structure of the lawn mower;

[0025] Figure 4 yes Figure 1 A sectional view of a partial structure of a lawn mower;

[0026] Figure 5 yes Figure 1 A three-dimensional diagram of a partial structure of a head shell of a lawn mower;

[0027] Figure 6 yes Figure 1 A three-dimensional diagram of a partial structure of a lawn mower;

[0028] Figure 7 yes Figure 1 A front view of a cable reel of a lawn mower, wherein the elastic members are in a first state;

[0029] Figure 8 yes Figure 1 A front view of a cable reel of a lawn mower, wherein a portion of the elastic member is in a second state;

[0030] Fig. 9 is a schematic diagram of a partial structure of a cable reel and a clutch mechanism of a grass trimmer according to a second embodiment of the present invention;

[0031] Fig.10 is a perspective view of a wire winding reel of a mowing head according to a third embodiment of the present invention;

[0032] Fig.11 yes Fig.10 A front view of the winding drum of the grass trimmer head, wherein the elastic members are in the first state;

[0033] Fig.12 yes Fig.10 A front view of the winding drum of the mower head, wherein a portion of the elastic member is in the second state;

[0034] Fig.13 Schematic diagram of a wire reel, a head shell and a clutch mechanism of a grass trimmer according to a fourth embodiment of the present invention. DETAILED DESCRIPTION

[0035] Figure 1 The figure shows a schematic diagram of a grass trimmer 100 of the first embodiment of the present invention. The winding method of the grass trimmer 100 in the present invention can be manual winding or automatic winding, or multiple winding methods switched according to actual operation scenarios. The grass trimmer 100 has a grass trimming mode, a winding mode and a line release mode, and the three modes correspond to grass trimming, winding and line release operations respectively.

[0036] like Figure 1 , Figure 2 As shown, the grass trimmer 100 includes a grass trimming rope 11, a grass trimming head 12 and a driving mechanism 13. The grass trimming head 12 cooperates with the grass trimming rope 11 for grass trimming, and the driving mechanism 13 drives the grass trimming head 12 to rotate along a first rotation direction with the rotation axis 101 as the axis. The grass trimmer 100 also includes a shield 14 for preventing grass clippings from splashing and a handle 15 for the user to operate.

[0037] like Figure 3 , Figure 4As shown, the driving mechanism 13 includes a motor 131 and a motor housing 132. The motor 131 drives the grass trimming head 12 to rotate along the first rotation direction with the rotation axis 101 as the axis. The grass trimming head 12 includes a head shell 121, a winding disk or a spool 122 and a clutch mechanism 123. The head shell 121 includes an upper cover 121a and a lower cover 121b that form a detachable connection. The upper cover 121a and the lower cover 121b are surrounded by a storage space for accommodating the winding disk 122 and a threading hole 121c for the grass trimming rope 11 to pass through. The winding disk 122 is formed with a winding portion 122a for winding.

[0038] The clutch mechanism 123 is used to realize power transmission between the head shell 121 and the winding disk 122. The clutch mechanism 123 has at least two states: a first state and a second state. When the clutch mechanism 123 is in the first state, the head shell 121 and the winding disk 122 form a synchronous rotation with the rotation axis 101 as the axis and along the first rotation direction.

[0039] When the clutch mechanism 123 is in the second state, the wire winding drum 122 generates relative rotation along the first rotation direction or the second rotation direction relative to the head shell 121, and the second rotation direction is opposite to the first rotation direction. In other words, when the clutch mechanism 123 is in the second state, the wire winding drum 122 generates relative rotation relative to the head shell 121, and the direction of relative rotation can be the first direction or the second direction. Alternatively, the wire winding drum 122 can rotate along the first direction or the second direction relative to the head shell 121. Regardless of whether the wire winding drum 122 generates relative rotation along the second rotation direction or the first rotation direction relative to the head shell 121, the winding operation can be achieved as long as the two generate relative rotation.

[0040] In fact, when the grass trimming head 12 is in the normal grass trimming mode, the clutch mechanism 123 is in the first state, and when the grass trimming head 12 is in the winding mode, the clutch mechanism 123 is in the second state. The clutch mechanism 123 includes an elastic member 123a capable of elastic deformation. When the clutch mechanism 123 is in the first state, the elastic member 123a is in the first form, and when the clutch mechanism 123 is in the second state, the elastic member 123a is in the second form. That is to say, when the grass trimming head 12 is switched from the grass trimming mode to the winding mode, the elastic member 123a of the clutch mechanism 123 undergoes a shape change.

[0041] The trimmer head 12 further includes a biasing element 124, which generates a biasing force that can at least drive the clutch mechanism 123 to move toward the first state. In other words, the biasing force generated by the biasing element 124 can keep the clutch mechanism 123 in the first state or move the clutch mechanism 123 to the first state, and the drive winding reel 122 and the head shell 121 do not rotate relative to each other.

[0042] The biasing element 124 can generate a biasing force to resist the winding drum 122 or the head shell 121, that is, the biasing force generates a component force at least in a direction parallel to the rotation axis 101. Generally speaking, the biasing element 124 is a coil spring arranged along the direction of the rotation axis 101 or parallel to the direction of the rotation axis 101, and the coil spring is fixedly connected to the lower cover 121b of the head shell 121. Of course, the structure of the biasing element 124 is not limited to a spring structure, and can also be other structural parts that can undergo elastic deformation, as long as it can satisfy the resisting effect on the head shell 121 or the winding drum 122 and cause the head shell 121 to produce a relative displacement along the axial direction relative to the winding drum 122.

[0043] In fact, the mower 100 also has a line-release mode. When the mowing rope 11 is damaged, the head shell 121 or the winding drum 122 needs to be rotated to release a new mowing rope 11. The most commonly used line-release method is automatic line-release: the housing is relatively displaced along the axial direction relative to the winding drum 122, and the housing and the winding drum 122 are rotated along the first direction around the rotation axis 101, and the mowing rope 11 is thrown out of the winding drum 122 through the threading hole 121c by centrifugal force. The design of the biasing element 124 enables the housing of the mower 100 to be relatively displaced along the axial direction relative to the winding drum 122 when the user knocks the head shell 121 to the ground, thereby realizing automatic line release. Of course, the biasing element 124 can generate a biasing force against the winding reel 122 or the head shell 121 when the mower 100 is in the mowing mode, the winding mode, and the pay-out mode, or it can generate a biasing force against the winding reel 122 or the head shell 121 only in the pay-out mode or in the pay-out mode and the winding mode.

[0044] In this embodiment, the biasing element 124 generates a biasing force against the winding disc 122 or the head shell 121 when the grass trimmer 100 is in the grass trimming mode, the winding mode, and the unwinding mode. More specifically, one end of the biasing element 124 is fixedly connected to the head shell 121, and the other end is in contact with the winding disc 122, generating a biasing force against both the head shell 121 and the winding disc 122. It can be understood that one end of the biasing element 124 can also be fixedly connected to the winding disc 122, and the other end is in contact with the head shell 121.

[0045] The elastic member 123a can at least be deformed in a direction parallel to the rotation axis 101 during the process of changing from the first form to the second form. In fact, during the process of switching the clutch mechanism 123 from the first state to the second state, the head shell 121 has a relative displacement in a direction parallel to the rotation axis 101 relative to the winding disk 122. The clutch mechanism 123 in the prior art does not have an elastic member 123a. During the process of switching the clutch mechanism 123 from the first state to the second state, the relative displacement of the head shell 121 relative to the winding disk 122 in a direction parallel to the rotation axis 101 comes from the elastic displacement caused by the further compression of the biasing element 124 in this direction. The difference of the present invention is that the relative displacement of the head shell 121 relative to the winding disk 122 in a direction parallel to the rotation axis 101 comes from the elastic deformation of the elastic member 123a in this direction, or at least part of the relative displacement comes from the elastic deformation of the elastic member 123a in this direction. In this embodiment, the relative displacement of the head shell 121 relative to the winding drum 122 in a direction parallel to the rotation axis 101 is basically entirely derived from the elastic deformation of the elastic member 123a in this direction. Of course, it can be understood that the biasing element 124 can also be displaced in a direction parallel to the rotation axis 101 during winding. In other words, the relative displacement of the head shell 121 relative to the winding drum 122 in a direction parallel to the rotation axis 101 during winding can be provided by both the elastic displacement of the elastic member 123a and the elastic displacement of the biasing element 124.

[0046] When the clutch mechanism 123 is in the second state, at least a part of the rotational torque applied to the winding disc 122 or the head shell 121 is used to resist the elastic force generated by the elastic member 123a. When the grass trimmer head 12 is in the winding mode, the clutch mechanism 123 is in the second state, the elastic member 123a is in the second form, the rotational torque applied to the winding disc 122 or the head shell 121 causes relative rotation, and at this time, the elastic member 123a generates a component force in the opposite direction of the rotational torque, a part of the rotational torque is used to overcome the component force, and the other part is used to drive the winding disc 122 and the head shell 121 to rotate relative to each other.

[0047] like Figures 5 to 8As shown, the clutch mechanism 123 also includes a matching piece 123b for matching with the elastic piece 123a to transmit power. The elastic piece 123a is arranged on one of the winding disk 122 or the head shell 121, and the matching piece 123b is arranged on the other of the winding disk 122 and the head shell 121. In this embodiment, the elastic piece 123a is arranged on the winding disk 122, and the matching piece 123b is arranged on the head shell 121, specifically, it is arranged on the upper cover 121a of the head shell 121. The elastic piece 123a is formed with a driving surface 11', and the driving surface 11' is substantially perpendicular to the end surface of the winding disk 122. When the elastic piece 123a is in the first state, the driving surface 11' drives the matching piece 123b to rotate along the first rotation direction with the elastic piece 123a. That is to say, when the elastic piece 123a is in the first state, the driving surface 11' of the elastic piece 123a drives the head shell 121 to rotate synchronously with the winding disk 122 along the first rotation direction.

[0048] The elastic member 123a is also formed with an elastic surface 12', and the elastic surface 12' allows the matching member 123b to rotate relative to the elastic member 123a along the second rotation direction when the elastic member 123a is in the second state. The elastic surface 12' at least includes a first inclined surface 121' that forms a certain angle with the winding disk 122 and is inclined upward. In this embodiment, the elastic surface 12' also includes a second inclined surface 122' that is inclined downward, and the two ends of the second inclined surface 122' are respectively connected to the first inclined surface 121' and the driving surface 11'. The matching member 123b is provided with structures that match the driving surface 11' and the elastic surface 12' respectively. It should be noted that the driving surface 11' and the elastic surface 12' of the elastic member 123a can be either a plane or a curved surface.

[0049] One end of the elastic member 123a is fixedly connected to an end surface of the winding drum 122, and the other end is suspended. The elastic member 123a extends upward along the circumference of the winding drum 122 and forms a certain angle with the end surface of the winding drum 122. Of course, the elastic member 123a can also be integrally formed with the winding drum 122, which is not limited here. In the embodiment, the elastic member 123a is a metal spring; as an optional embodiment, the elastic member 123a can be a plastic spring. Figure 6 is a plan view of the elastic member 123a in the first state, Figure 7 1 is a plan view of the elastic member 123a in the second state. In the process of changing from the first state to the second state, the elastic member 123a undergoes obvious deformation in the direction parallel to the rotation axis 101. For the convenience of explanation, the figure sets the up and down directions. Specifically, the metal spring piece undergoes downward deformation in the direction parallel to the rotation axis 101 after being subjected to force. In addition, in this embodiment, 6 metal spring pieces are evenly arranged along the circumferential direction on the surface of the winding drum 122, but the number and material of the spring pieces are not specifically limited.

[0050] like Figure 6 and Figure 7 As shown, the height c of the driving surface 11' perpendicular to the end surface of the winding disk 122 is about 2mm, the length a of the first inclined surface 121' of the elastic member 123a is about 25mm, and the length b of the first inclined surface 122' of the elastic member 123a is about 5mm. The acute angle α formed by the first inclined surface 121' of the elastic member 123a and the end surface of the winding disk 122 is about 60°, and the acute angle β formed by the second inclined surface 122' of the elastic member 123a and the end surface of the winding disk 122 is about 5°. Of course, the above specific parameter definitions are only preferred for this embodiment, and the present invention does not limit the specific structure of the elastic member 123a. In fact, the above parameter settings, especially the inclination angle formed by the first inclined surface 121' and the second inclined surface 122' of the elastic member 123a and the end surface of the winding disk 122, greatly reduce the load of the grass trimmer 100 when winding, thereby reducing the power consumption of the motor 131. Specifically, the output power of the lawn mower 100 in this embodiment during winding is less than or equal to 529w. Compared with a lawn mower using a clutch mechanism of the same size but unable to undergo elastic deformation, the reduction in the output power of the motor 131 during winding is greater than or equal to 30%.

[0051] In this embodiment, since the driving surface 11' of the elastic member 123a is substantially perpendicular to the end surface of the winding drum 122, the clutch mechanism 123, when in the second state, substantially only allows the winding drum 122 to rotate relative to the head shell 121 in a second direction opposite to the first rotation direction.

[0052] Fig. 9 The diagram shows a partial structure of the winding drum 222 and the clutch mechanism of the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that the structure of the clutch mechanism is different. The parts of the first embodiment that are compatible with this embodiment can be applied to this embodiment. The following only introduces the differences between this embodiment and the first embodiment. The driving surface 21' of the elastic member 223a is slightly inclined. Specifically, the driving surface 21' of the elastic member 223a is inclined downward, and forms a connection with the upper end surface 222a of the winding drum 222. Fig. 9 The acute angle n shown. Furthermore, a corresponding inclined plane parallel to the driving surface 21' is also provided on the mating piece (not marked in the figure), and the two cooperate with each other when the clutch mechanism is in the first state, and the driving surface 21' drives the mating piece to rotate along the first rotation direction. At this time, the driving force along the first rotation direction received by the winding disk 222 is not large enough to cause relative movement between the driving surface 21' and the mating piece. When the clutch mechanism is in the second state, the winding disk 222 is subjected to a driving force along the first rotation direction that is large enough to cause relative movement between the driving surface 21' and the mating piece. Specifically, the driving surface 21' rotates relative to the mating piece along the first rotation direction. It can be understood that since the other parts of the structure of the elastic member 223a are similar to the Figures 5 to 8 Therefore, this embodiment can also realize that the winding disk 222 rotates relative to the head shell in a second direction opposite to the first rotation direction. That is to say, when the clutch structure in this embodiment is in the second state, the winding disk 222 can rotate relative to the head shell in both the first direction and the second direction. Of course, this embodiment is only a possible specific structure expanded on the basis of the first embodiment, and does not limit the protection scope of the present invention.

[0053] Figures 10 to 12 The third embodiment of the present invention is shown as the wire winding disc 322 and the elastic member 232a of the grass trimmer head. The difference between this embodiment and the first embodiment is only the difference in the structure of the elastic member 323a and the wire winding disc 322. The parts of the first embodiment that are compatible with this embodiment can be applied to this embodiment. Only the differences between this embodiment and the first embodiment are described below.

[0054] Fig.11 is a plan view of the elastic member 323a in the first state, Fig.123 is a plan view of the elastic member 323a in the second state. The elastic member 323a undergoes obvious deformation downward in the direction parallel to the rotation axis 301 during the process of changing from the first state to the second state. The elastic member 323a of the clutch mechanism 323 in this embodiment is a metal spring sheet. Three metal spring sheets are evenly arranged along the circumferential direction on the surface of the winding disk 322. Similarly, the number of spring sheets in this embodiment is not limited. In fact, the function of the clutch mechanism 323 can be achieved as long as the number of spring sheets is greater than or equal to 1. The elastic member 323a in this embodiment is also formed with a driving surface 31' for driving the matching member 323b to rotate with the elastic member 323a when the elastic member 323a is in the first state. The driving surface 31' is perpendicular to the end surface of the winding disk 322. The elastic member 323a is also formed with an elastic surface 32' for allowing the matching member 323b to rotate relative to the elastic member 323a when the elastic member 323a is in the second state. The elastic surface 32' at least includes a first inclined surface 321' which forms a certain angle with the winding drum 322 and is inclined upward. In this embodiment, the elastic surface 32' also includes a second inclined surface 332' which is inclined downward. One end of the elastic member 323a is fixedly connected to an end surface of the winding drum 322, and the other end is provided with a flange 323b, which extends into the interior of the winding drum 322. When the elastic member 323a is in the first form, the flange 323b abuts or contacts the winding drum 322 on a plane parallel to the end surface of the winding drum 322, thereby preventing the elastic member 323a from being displaced upward along with the matching member 323b when the mower is in the line-releasing mode. As an optional embodiment, when the elastic member 323a is in the first form, the flange 323b does not contact the winding drum 322 on a plane parallel to the end surface of the winding drum 322. When the elastic member 323a is displaced upward by a certain distance, the flange 323b abuts against the winding drum 322, thereby preventing the elastic member 323a from being displaced excessively upward. In fact, the specific structure of the flange 323b only needs to be able to prevent the elastic member 323a from making excessive upward displacement in a direction parallel to the rotation axis 301. In other words, it can prevent the friction between the elastic member 323a and the mating member 323b from causing the winding reel 322 and the head shell to be unable to make relative displacement in a direction parallel to the rotation axis 301. Therefore, the structure of the flange 323b is not specifically limited.

[0055] Fig.13The schematic diagram of the winding disk 422 and the head shell 421 of the grass trimmer head of the fourth embodiment of the present invention is shown. The difference between this embodiment and the previous three embodiments lies in the specific structure and working principle of the clutch mechanism. Specifically, the clutch mechanism includes a first magnetic component and a second magnetic component: the first magnetic component is arranged in one of the head shell 421 or the winding disk 422; the second magnetic component is arranged in the other of the head shell 421 or the winding disk 422; a magnetic force is formed between the first magnetic component and the second magnetic component; when the clutch mechanism is in the second state, the repulsive force between the first magnetic component and the second magnetic component is greater than the attractive force. The first magnetic component arranged in the winding disk 422 includes at least one first magnetic member 423a, and the second magnetic component arranged in the head shell 421 includes at least one second magnetic member 423b; the first magnetic member 423a and the second magnetic member 423b are both made of magnetic materials. When the clutch mechanism is in the second state, the first magnetic member 423a cooperates with the second magnetic member 423b, and the cooperation parts have opposite magnetic poles respectively.

[0056] In this embodiment, the first magnetic component 423a is approximately in the shape of an inclined block, wherein the magnetic pole where the inclined surface 423c is located is the N pole or the S pole, and the magnetic pole of the bottom surface opposite to the inclined surface 423c is opposite to the magnetic pole of the inclined surface 423c. The second magnetic component 423b has a matching inclined surface 423d that matches the inclined surface 423c of the first magnetic component, and the magnetic pole of the matching inclined surface 423d is opposite to the magnetic pole of the inclined surface 423c of the first magnetic component. This makes the repulsive force between the first magnetic component and the second magnetic component greater than the attractive force when the clutch mechanism is in the second state, and the repulsive force between the opposite magnetic poles is used to contribute a part of the force of pressing down the biasing member, thereby reducing the load during winding. The first magnetic member 423a further includes a driving surface 423e, which is substantially perpendicular to the upper end surface of the winding disk 422; the second magnetic member 423b has a driven surface 423f that cooperates with the driving surface 423e, and when the clutch mechanism is in the first state, the driving surface 423e drives the driven surface 423f to rotate about the rotation axis 401. It should be noted that the specific structure of the first magnetic component and the second magnetic component in this embodiment is only one implementation method, and does not limit the protection scope of the present invention.

[0057] In fact, the structure of the clutch mechanism in the present invention is not limited to the structures shown in the above four embodiments. For example, as an optional embodiment, an inclined wedge block made of elastic material is provided on the surface of the winding disk as an elastic member, and the inclined wedge block is molded to the surface of the winding disk by a secondary injection molding method. As another optional embodiment, elastic structures that can undergo elastic deformation and cooperate with each other are provided on the head shell and the winding disk, which means that both the elastic member and the matching member are elastically deformed during winding. In short, as long as the clutch structure can be elastically deformed in a direction parallel to the axis of rotation when the grass trimmer head is winding, it is within the protection scope of the present invention.

[0058] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the above embodiments do not limit the present invention in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present invention.

Claims

1. A lawn mower, comprising: A mowing head, used for mowing; The driving mechanism can at least drive the mowing head to rotate along a first rotation direction about a rotation axis; The mowing head comprises: Head shell; A winding drum is formed with a winding portion; A clutch mechanism, used to achieve power transmission between the head shell and the winding disk; the clutch mechanism has at least a first state for making the head shell and the winding disk rotate synchronously, and a second state for allowing the winding disk to rotate relative to the head shell along the first rotation direction or a second rotation direction opposite to the first rotation direction; The clutch mechanism comprises: An elastic member capable of elastic deformation, and the elastic member has at least a first shape and a second shape; When the clutch mechanism is in the first state, the elastic member is in the first form; when the clutch mechanism is in the second state, the elastic member is in the second form; The mowing head also includes: A biasing element generates a biasing force capable of at least driving the clutch mechanism to move toward the first state.

2. The grass trimmer according to claim 1, characterized in that: The biasing element can generate a biasing force at least in a direction parallel to the rotation axis; and the elastic member can be deformed at least in a direction parallel to the rotation axis during the process of changing from the first form to the second form.

3. The grass trimmer according to claim 2, characterized in that: The biasing element is a coil spring arranged along the direction of the rotation axis or parallel to the direction of the rotation axis.

4. The grass trimmer according to claim 1, characterized in that: The lawn mower also includes: A biasing element, generating a biasing force capable of resisting the winding reel or the head shell; When the clutch mechanism is in the second state, at least a part of the rotational torque applied to the winding reel or the head shell is used to resist the elastic force generated by the elastic member.

5. The grass trimmer according to claim 1, characterized in that: The lawn mower also includes: A biasing element, which generates a first biasing force capable of resisting the winding reel or the head shell when the clutch mechanism is in the second state; When the clutch mechanism is in the second state, the elastic member generates an elastic force capable of resisting the winding reel or the head shell.

6. The grass trimmer according to claim 1, characterized in that: The elastic member is integrally formed with the winding drum or the head shell.

7. The grass trimmer according to claim 1, characterized in that: The elastic member is arranged on the winding reel or the head shell.

8. The grass trimmer according to claim 7, characterized in that: The clutch mechanism also includes a matching piece for matching with the elastic piece to transmit power.

9. The grass trimmer according to claim 8, characterized in that: The elastic member is arranged on one of the winding drum or the head shell, and the matching member is arranged on the other of the winding drum and the head shell; The elastic member is formed with: a driving surface, for driving the matching member to rotate along with the elastic member when the elastic member is in the first state; The elastic surface allows the matching member to rotate relative to the elastic member when the elastic member is in the second state.

10. A grass trimmer head, comprising: Head shell; A winding drum is formed with a winding portion; A clutch mechanism, used to achieve power transmission between the head shell and the winding disk; the clutch mechanism has at least a first state for making the head shell and the winding disk rotate synchronously, and a second state for allowing the winding disk to rotate relative to the head shell in a first rotation direction or a second rotation direction opposite to the first rotation direction; The clutch mechanism comprises: An elastic member capable of elastic deformation, and the elastic member has at least a first shape and a second shape; When the clutch mechanism is in the first state, the elastic member is in the first form; when the clutch mechanism is in the second state, the elastic member is in the second form; Also includes: A biasing element generates a biasing force capable of at least driving the clutch mechanism to move toward the first state.

11. The grass trimmer head according to claim 10, characterized in that: The biasing element can generate a biasing force at least in a direction parallel to the rotation axis; and the elastic member can be deformed at least in a direction parallel to the rotation axis during the process of changing from the first form to the second form.

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