Transmission device and gardening tool

Abstract

The utility model provides a transmission device and a gardening tool with the same. The transmission device comprises a support, a bearing and a rotating piece rotationally supported by the bearing. The bracket is suitable for mounting the driving device and the bearing so as to allow torque to be transmitted from the transmission device to the rotating piece. The rotating part is suitable for transmission connection with an operation device. The transmission device further comprises an intermediate piece. The bearing is fixedly installed in the installation hole of the support through the middle piece, so that the bearing and the inner surface of the installation hole are spaced. The middle piece and the support are made of different materials. The inner surface of the support mounting hole and the bearing are separated by the middle piece, and force, heat and impact generated in the rotating process of the rotating piece are directly borne by the middle piece instead of the inner surface of the support mounting hole, so that the inner surface of the support mounting hole is protected, and the risk of damage to the support is reduced. The middleware and the support are made of different materials, so that the middleware and the support can be made of materials better matched with the functions of the middleware and the support respectively, and cost and service life are both considered.

Description

Technical Field

[0001] The present disclosure relates to the technical field of garden tools, and in particular, to a transmission device of a garden tool and a garden tool having the transmission device. Background Art

[0002] Garden tools include various tools and equipment used for gardening and gardening operations. These tools can help people plant, prune, and trim gardens, lawns, and other outdoor spaces. Their appearance saves labor time and reduces the labor intensity of gardening operations.

[0003] Some garden tools have a transmission device that can transmit power to the working device to perform operations such as pruning and cutting. The transmission device may include a bracket, a bearing, and a rotating member. The rotating member is supported by a bearing installed in a mounting hole of the bracket so that it rotates when driven to drive the working device to perform gardening operations.

[0004] However, after a period of use, damage to the stent may occur. Summary of the invention

[0005] In view of this, the present invention improves the transmission device of the garden tool, aiming to solve the problem that the bracket is easily damaged.

[0006] On the one hand, the present disclosure provides a transmission device for a garden tool. In addition to the transmission device, the garden tool provided by the present disclosure also includes a drive device and an operating device for performing garden operations. The transmission device provided by the present disclosure includes a bracket, a bearing, and a rotating member rotatably supported by the bearing. The bracket is suitable for mounting the drive device and the bearing to allow torque to be transmitted from the transmission device to the rotating member. The rotating member is suitable for transmission connection with the operating device. The transmission device also includes an intermediate member. The bearing is fixedly mounted on the mounting hole of the bracket through the intermediate member, so that the bearing is spaced from the inner surface of the mounting hole. The intermediate member and the bracket are made of different materials.

[0007] Since the inner surface of the bracket mounting hole and the bearing are separated by the intermediate piece, the force, heat and impact generated during the rotation of the rotating member will be directly borne by the intermediate piece, rather than the inner surface of the bracket mounting hole, which helps to protect the inner surface of the bracket mounting hole and reduce the risk of damage to the bracket. The intermediate piece and the bracket are made of different materials, which allows the two to select materials that better match their respective functions to achieve the expected technical purpose, for example, while reducing the risk of damage to the bracket, taking into account lower costs, and / or, while reducing the risk of damage to the bracket, taking into account lighter weight.

[0008] As a possible implementation manner, the middle piece is made of metal material, and the bracket is made of plastic material.

[0009] The bracket requires a lot of materials, and the use of plastic materials can reduce its weight and material cost. The middle piece needs to contact the bearing and needs to bear more heat and impact. The use of metal materials can ensure that it has excellent thermal conductivity to speed up heat dissipation and avoid melting the bracket due to heat accumulation. In addition, metal materials are also stronger and are not easily damaged by long-term stress and impact. It can be seen that by choosing a bracket made of plastic and a middle piece made of metal, it is possible to reduce the risk of bracket damage while taking into account lighter weight and lower cost.

[0010] As a possible implementation, the middle piece includes a cylindrical portion and an outer flange, the outer flange is located on one axial side of the cylindrical portion and extends radially outward, the cylindrical portion is located between the outer circumferential surface of the bearing and the inner circumferential surface of the mounting hole, and the outer flange is located outside the mounting hole.

[0011] The cylindrical portion located between the outer peripheral surface of the bearing and the inner peripheral surface of the bracket mounting hole can separate the two to protect the inner peripheral surface of the bracket mounting hole. At the same time, the cylindrical portion can also transfer the heat transferred from the bearing to the outer flange. The outer flange located outside the mounting hole and extending radially outward can transfer the heat from the cylindrical portion to the outside, thereby improving the heat dissipation effect, preventing heat from accumulating in the bracket mounting hole, and further preventing the mounting hole from melting or deforming due to heat.

[0012] As a possible implementation manner, the outer flange is provided with at least one notch, the bracket is provided with at least one lug, and each notch corresponds to a lug, so as to limit the relative rotation between the intermediate piece and the bracket.

[0013] Through the cooperation of the notch and the lug, the intermediate piece is securely fixed in the circumferential direction, which helps to prevent the intermediate piece from rotating relative to the bracket pair.

[0014] As a possible implementation manner, the bracket is provided with a boss portion, the mounting hole is at least partially defined by the boss portion, and the outer flange protrudes radially outward beyond the outer circumferential surface of the boss portion.

[0015] During the process of disassembling the intermediate piece, a tool or a hand can act on the portion of the outer flange protruding beyond the boss portion, so that the intermediate piece can be removed more conveniently.

[0016] As a possible implementation method, the middle piece includes a cylindrical portion and an inner flange, the inner flange is located on one axial side of the cylindrical portion and extends radially inward, the cylindrical portion is located between the outer circumferential surface of the bearing and the inner circumferential surface of the mounting hole, and the inner flange is located between the bottom surface of the mounting hole and the axial inner end surface of the bearing.

[0017] The inner flange extending inwardly can separate the inner end surface of the bearing and the bottom surface of the bracket mounting hole to protect the bottom surface of the bracket mounting hole. In addition, the existence of the inner flange increases the heat dissipation area of ​​the entire middle piece, thereby further improving the heat dissipation effect.

[0018] As a possible implementation manner, the inner diameter of the inner flange is greater than or equal to the inner diameter of the outer ring of the bearing.

[0019] A sealing ring is usually provided between the inner ring and the outer ring of the bearing. Since the inner diameter of the flange is greater than or equal to the inner diameter of the outer ring of the bearing, the inner flange will not come into contact with the sealing ring, which can avoid the inner flange from rubbing against the sealing ring and also avoid the inner flange from directly transferring heat to the sealing ring, thereby avoiding or reducing the negative impact on the sealing ring.

[0020] As a possible implementation, the rotating member includes a wheel portion and a shaft portion fixed to the wheel portion, the shaft portion is rotatably supported by a bearing, and the wheel portion includes a hub connected to the shaft portion, a rim surrounding the hub, and a plurality of spokes extending therebetween.

[0021] This creates multiple channels between the hub, rim and spokes that allow air to flow through to remove heat that builds up around the bearings.

[0022] As a possible implementation manner, each spoke is in the shape of a blade inclined relative to the rotation axis of the rotating member.

[0023] When the rotating parts are working, the blade-shaped spokes can push the air to move, generate airflow, and act as a fan, thereby helping to remove the heat accumulated around the bearings and further improving the heat dissipation effect.

[0024] As a possible implementation manner, the transmission device further includes a cover member, the cover member covers the rotating member, the cover member includes a grid wall portion, and the grid wall portion is located on one axial side of the rotating member.

[0025] The mesh holes in the grid wall allow airflow to pass through the grid wall to the bearings, carrying away the accumulated heat, which helps to further improve the heat dissipation effect.

[0026] On the other hand, the present disclosure provides a gardening tool, which includes the above-mentioned transmission device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] It should be understood that the following drawings only illustrate certain embodiments of the present disclosure and should not be viewed as limiting the scope.

[0028] It should be understood that the same or similar reference numerals are used in the drawings to indicate the same or similar elements.

[0029] It should be understood that the drawings are merely schematic and that the sizes and proportions of elements in the drawings are not necessarily accurate.

[0030] Figure 1 A structural schematic diagram of a garden tool is provided for one embodiment of the present disclosure.

[0031] Figure 2 for Figure 1 A schematic diagram of the structure of the transmission device, drive device and working device of the garden tool.

[0032] Figure 3 for Figure 2 Schematic diagram of the structure of the transmission device and drive device.

[0033] Figure 4 for Figure 3 Schematic cross-sectional view of the transmission and drive device in FIG.

[0034] Figure 5 yes Figure 4 Schematic cross-sectional view of the bracket, intermediate piece and bearing outer ring in FIG.

[0035] Figure 6 for Figure 3 Schematic diagram of the structure of part of the transmission device and drive device.

[0036] Figure 7 for Figure 4 Schematic diagram of the structure of the middleware in .

[0037] Figure 8 for Figure 4 Schematic diagram of the structure of the wheel part of the rotating part.

[0038] Fig. 9 for Figure 8 A structural schematic diagram of the angle between the spokes and the rotation axis of the rotating part. DETAILED DESCRIPTION

[0039] The following is an exemplary description of the embodiments of the present disclosure in conjunction with the accompanying drawings. It should be understood that the present disclosure can be implemented in a variety of ways and should not be construed as being limited to the embodiments described herein, which are only for a more thorough and clear understanding of the present disclosure.

[0040] The present disclosure provides a garden tool 100. The garden tool 100 can be any type of equipment for performing gardening operations. For example, in some examples, the garden tool 100 can be a lawn mower. Of course, in other examples, the garden tool 100 can also be other types of gardening operation equipment.

[0041] For ease of understanding, the following first illustrates the structure of the garden tool 100. It should be understood that the structure of the garden tool 100 should not be limited to the following description. For example, one or more of the elements described below can be omitted or replaced, and the layout relationship between them can be replaced.

[0042] refer to Figure 1The garden tool 100 may include a body portion 110 and a handrail portion 120, wherein the body portion 110 includes a housing 111 and a running mechanism 112. For example, the running mechanism 112 may be composed of a plurality of wheels 112. When performing gardening operations, the user may hold the handrail portion 120 to control the travel trajectory of the garden tool 100. Of course, in other examples, the garden tool 100 may also be operated in an unmanned manner, for example, by using a radio remote control device and a self-provided program control device.

[0043] refer to Figure 1 and Figure 2 , the garden tool 100 may include a transmission device 200, a drive device 300 and a working device 400, which may be contained in the housing 111. The transmission device 200 may be connected to the drive device 300 and the working device 400 in a transmission manner, so that the torque output by the drive device 300 may be transmitted to the working device 400, and the garden work may be performed by the working device 400. For example, the drive device 300 may be a motor. Of course, in other examples, the drive device 300 may also be other types of torque output devices. Taking the garden tool 100 as a lawn mower as an example, the working device 400 may be a lawn mower assembly, or a lawn mower head assembly, which may include a rotating frame 410 and a lawn mower 420 mounted thereon.

[0044] refer to Figure 3 and Figure 4 , the transmission device 200 includes a bracket 210 and a rotating member 220. The driving device 300 is mounted on the bracket 210, and the rotating member 220 is also mounted on the bracket 210. The rotating member 220 is connected to the working device 400 in a transmission manner, so that the torque can be transmitted from the driving device 300 to the rotating member 220, thereby driving the working device 400 to perform an operation. As an example, the rotation axis A1 of the torque output member of the driving device 300 can be parallel to the rotation axis A2 of the rotating member 220 and spaced from each other. In a specific example, the transmission device 200 can transmit torque by belt transmission. In this example, the rotating member 220 is a pulley 220, and the transmission device 200 also includes a pulley 230 and a belt 240. The pulley 230 is connected to the torque output member of the driving device 300 in a transmission manner, and the belt 240 is wound on the pulley 220 and the pulley 230 to achieve torque transmission. Of course, in other examples, the transmission device 200 can also adopt other types of torque transmission methods, such as chain transmission or gear transmission.

[0045] refer to Figures 4 to 6The transmission device 200 may further include a bearing 250 and an intermediate member 260, and the bracket 210 is provided with a mounting hole 211. The rotating member 220 is rotatably supported by the bearing 250. For example, the rotating member 220 may include a shaft portion 221, and the shaft portion 221 may extend into the inner hole of the bearing 250 to be rotatably supported by the bearing 250. For example, the bearing 250 may be a radial bearing. In particular, the bearing 250 may be a radial rolling bearing. The bearing 250 may be installed in the mounting hole 211 through the intermediate member 260 to be installed on the bracket 210, so that the bearing 250 is spaced apart from the inner surface of the mounting hole 211. In the present disclosure, the intermediate member 260 and the bracket 210 are made of different materials respectively.

[0046] The inventors found that in the related technology, the heat generated by the rotation of the rotating part will be transferred to the mounting hole through the bearing, and the impact generated will also directly act on the mounting hole, which will cause the mounting hole of the bracket to easily melt due to heat, or easily deform after frequent impacts, which will cause damage to the bracket and thus reduce the life of the bracket.

[0047] According to the garden tool 100 provided by the present disclosure, since the inner surface of the mounting hole 211 of the bracket 210 and the bearing 250 are separated by the middle piece 260, the force, heat and impact generated during the rotation of the rotating member 220 will be directly borne by the middle piece 260, rather than the inner surface of the mounting hole 211 of the bracket 210, which helps to protect the inner surface of the mounting hole 211 of the bracket 210 and reduce the risk of damage to the bracket 210. The middle piece 260 and the bracket 210 are made of different materials, which allows the two to respectively select materials that better match their respective functions to obtain the expected technical purpose, for example, while reducing the risk of damage to the bracket 210, taking into account lower costs, and / or, while reducing the risk of damage to the bracket 210, taking into account lighter weight.

[0048] The present disclosure does not place any particular limitation on the materials of the bracket 210 and the middle piece 260. As an example, the bracket 210 may be made of plastic, and the middle piece 260 may be made of metal. The bracket 210 requires a large amount of materials, and the use of plastic materials can reduce its weight and material costs. The middle piece 260 needs to be in contact with the bearing 250 and needs to bear more heat and impact. The use of metal materials can ensure that it has relatively excellent thermal conductivity to accelerate heat dissipation and avoid melting the bracket 210 due to heat accumulation. In addition, the metal material is also stronger and is not easily damaged by long-term stress and impact. It can be seen that by selecting a bracket 210 made of plastic and a middle piece 260 made of metal, it is possible to reduce the risk of damage to the bracket 210 while taking into account lighter weight and lower cost.

[0049] It is understood that in the present disclosure, metal is meant to cover metal single substance and alloy. As an example, the middle piece 260 can be made of metal materials such as steel, copper, aluminum or magnesium. Of course, in other examples, the middle piece 260 can also be made of other metal materials. It should be understood that in the present disclosure, plastics can include various types as long as they can meet actual needs. For example, the plastic in the present disclosure can be, but not limited to, polyethylene, polypropylene, polyvinyl chloride, polyamide, polycarbonate, polyoxymethylene ester, polyphenylene ether, polystyrene or polytetrafluoroethylene.

[0050] refer to Figure 4 , Figure 5 and Figure 7 The middle piece 260 may include a cylindrical portion 261 and an outer flange 262. The outer flange 262 may be located on one axial side of the cylindrical portion 261 and extend radially outward. The cylindrical portion 261 may be located between the outer circumferential surface of the bearing 250 and the inner circumferential surface of the mounting hole 211, and the outer flange 262 may be located outside the mounting hole 211.

[0051] The cylindrical portion 261 located between the outer circumferential surface of the bearing 250 and the inner circumferential surface of the mounting hole 211 of the bracket 210 can separate the two to protect the inner circumferential surface of the mounting hole 211 of the bracket 210. At the same time, the cylindrical portion 261 can also transfer the heat transferred from the bearing 250 to the outer flange 262. The outer flange 262 located outside the mounting hole 211 and extending radially outward can transfer the heat from the cylindrical portion 261 to the outside, thereby improving the heat dissipation effect, preventing heat from accumulating in the mounting hole 211 of the bracket 210, and further preventing the mounting hole 211 from melting or deforming due to heat.

[0052] Continue to refer Figure 4 , Figure 5 and Figure 7 The intermediate member 260 may further include an inner flange 263, which may be located on a side of the cylindrical portion 261 axially away from the outer flange 262 and extend radially inward. The inner flange 263 may be located between the bottom surface 211a of the mounting hole 211 and the axial inner end surface 251a of the bearing 250 to space the two.

[0053] The inner flange 263 extending inwardly can separate the inner end surface 251a of the bearing 250 and the bottom surface 211a of the mounting hole 211 of the bracket 210 to protect the bottom surface 211a of the mounting hole 211 of the bracket 210. In addition, the existence of the inner flange 263 increases the heat dissipation area of ​​the middle piece 260 as a whole, thereby further improving the heat dissipation effect.

[0054] It should be noted that the middle piece 260 may only include the cylindrical portion 261 and the outer flange 262 or only include the cylindrical portion 261 and the inner flange 263. Of course, the middle piece 260 may also include the cylindrical portion 261, the outer flange 262 and the inner flange 263 at the same time, so that the heat accumulated in the bearing 250 can be absorbed faster, the heat dissipation effect of the bearing 250 and the surrounding area can be improved, and the bracket 210 can be prevented from being damaged by heat, thereby improving the safety and reliability of the garden tool 100.

[0055] Continue to refer Figure 4 , Figure 5 and Figure 7 , the inner diameter D1 of the inner flange 263 may be greater than or equal to the inner diameter D2 of the outer ring 251 of the bearing 250. A sealing ring is usually provided between the inner ring and the outer ring 251 of the bearing 250. Since the inner diameter D1 of the inner flange 263 is greater than or equal to the inner diameter D2 of the outer ring 251, the inner flange 263 will not contact the sealing ring, which can prevent the inner flange 263 from rubbing against the sealing ring and also prevent the inner flange 263 from directly transferring heat to the sealing ring, thereby avoiding or reducing the negative impact on the sealing ring.

[0056] Combination Figure 6 and Figure 7 The outer flange 262 may be provided with at least one notch 262a, and the bracket 210 may be provided with at least one lug 212, and each notch 262a may correspond to a lug 212, so as to limit the relative rotation between the intermediate member 260 and the bracket 210. Through the cooperation between the notch 262a and the lug 212, the intermediate member 260 is reliably fixed in the circumferential direction, which helps to prevent the intermediate member 260 from rotating relative to the bracket 210.

[0057] It is understood that the structures of the notch 262a and the lug 212 can be in any form, as long as the mutual cooperation between the notch 262a and the lug 212 can prevent the two from rotating relative to each other, and there is no specific limitation on the structures of the notch 262a and the lug 212. It is also understood that although two lugs 212 and two notches 262a are shown in the figure, in other examples of the present disclosure, the number of the two can also be one each, or three or more each.

[0058] Return to the following Figure 5 The bracket 210 may be provided with a boss portion 212, the mounting hole 211 may be at least partially defined by the boss portion 212, and the outer flange 262 protrudes radially outward beyond the outer circumference of the boss portion 212. In this way, during the process of removing the intermediate member 260, a tool or a hand may act on the portion of the outer flange 262 protruding beyond the boss portion 212, so that the intermediate member 260 can be removed more conveniently.

[0059] Combination Figure 4 and Figure 8The rotating member 220 may include a wheel portion 222 and a shaft portion 221 fixed to the wheel portion 222, the shaft portion 221 is rotatably supported by a bearing 250, and the wheel portion 222 includes a hub 222a connected to the shaft portion 221, a rim 222b surrounding the hub 222a, and a plurality of spokes 222c extending therebetween.

[0060] In this way, a plurality of channels are formed between the hub 222 a , the rim 222 b and the plurality of spokes 222 c , and the channels allow air flow to pass through to remove heat accumulated around the bearing 250 .

[0061] It should be noted that the shaft 221 and the wheel 222 can be formed in one piece or assembled. As an example, the first part of the shaft 221 of the rotating member 220 can be installed in the bearing 250 to be supported by the bearing 250, the second part of the shaft 221 can be fixedly connected to the wheel 222, and the third part of the shaft 221 can pass through the mounting hole 211 and be transmission-connected to the working device 400 located on the other side of the bracket 210, so that when the rotating member 220 rotates, it can drive the working device 400 to rotate to perform gardening operations.

[0062] As an example. Figure 8 and Fig. 9 , each spoke 222c may be in the shape of a blade that is inclined relative to the rotation axis A2 of the rotating member 220. For example, the value range of the angle α between the inclined spoke 222c and the rotation axis A2 may be, but is not limited to, 0°<α≤45°. Since each spoke 222c is in the shape of a blade that is inclined relative to the rotation axis A2 of the rotating member 220, when the rotating member 220 rotates, the blade-shaped spoke 222c may push the air to move, thereby generating a high-speed airflow, playing the role of a fan, thereby helping to take away the heat accumulated around the bearing 250, further improving the heat dissipation effect.

[0063] In order to protect the rotating member 220 and prevent foreign matter from contacting it, the transmission device 200 may further include a cover member 270. Figure 3 The cover member 270 covers the rotating member 220, and the cover member 270 includes a grid wall portion 271, which is located on the side of the rotating member 220 axially away from the working device 400. The mesh of the grid wall portion 271 allows airflow to pass through the grid wall portion 271 to reach the bearing 250, taking away the accumulated heat, which helps to further improve the heat dissipation effect.

[0064] In the present disclosure, the directional terms "axial", "radial" and "circumferential" are relative, not absolute. The axial direction of a component may refer to the extending direction of its rotation axis, the radial direction may refer to the direction on a radial plane orthogonal to the rotation axis and intersecting the rotation axis, and the circumferential direction may refer to the circumferential direction around the rotation axis.

[0065] It should be understood that although the terms "first" or "second" etc. may be used in the present disclosure to describe various elements, such as the first portion and the second portion of the shaft portion 221, these elements are not defined by these terms, which are merely used to distinguish one element from another.

[0066] The basic principles of the present disclosure are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present disclosure are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present disclosure. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, and are not limitations. The above details do not limit the present disclosure to the necessity of adopting the above specific details to be implemented.

[0067] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present disclosure to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

[0068] The components and devices involved in this disclosure are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the drawings. As those skilled in the art will recognize, these components and devices can be connected, arranged, and configured in any manner.

[0069] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A transmission device for a garden tool, the garden tool further comprising a driving device and a working device for performing gardening work, the transmission device comprising a bracket, a bearing and a rotating member rotatably supported by the bearing, the bracket being suitable for mounting the driving device and the bearing to allow torque to be transmitted from the transmission device to the rotating member, the rotating member being suitable for transmission connection with the working device, characterized in that: The transmission device also includes an intermediate piece, and the bearing is fixedly mounted on the mounting hole of the bracket through the intermediate piece, so that the bearing is spaced apart from the inner surface of the mounting hole, wherein the intermediate piece and the bracket are made of different materials.

2. The transmission device according to claim 1, characterized in that: The middle piece is made of metal material, and the bracket is made of plastic material.

3. The transmission device according to claim 1 or 2, characterized in that: The intermediate piece includes a cylindrical portion and an outer flange, wherein the outer flange is located on one axial side of the cylindrical portion and extends radially outward, the cylindrical portion is located between the outer circumferential surface of the bearing and the inner circumferential surface of the mounting hole, and the outer flange is located outside the mounting hole.

4. The transmission device according to claim 3, characterized in that: The outer flange is provided with at least one notch, the bracket is provided with at least one lug, and each notch corresponds to one lug, so as to limit the relative rotation between the intermediate piece and the bracket.

5. The transmission device according to claim 3, characterized in that: The bracket is provided with a boss portion, the mounting hole is at least partially defined by the boss portion, and the outer flange protrudes radially outward beyond the outer circumferential surface of the boss portion.

6. The transmission device according to claim 1 or 2, characterized in that: The intermediate piece includes a cylindrical portion and an inner flange, wherein the inner flange is located on one axial side of the cylindrical portion and extends radially inward, the cylindrical portion is located between the outer circumferential surface of the bearing and the inner circumferential surface of the mounting hole, and the inner flange is located between the bottom surface of the mounting hole and the axial inner end surface of the bearing.

7. The transmission device according to claim 6, characterized in that: The inner diameter of the inner flange is greater than or equal to the inner diameter of the outer ring of the bearing.

8. The transmission device according to claim 1 or 2, characterized in that: The rotating member includes a wheel portion and a shaft portion fixed to the wheel portion, the shaft portion is rotatably supported by the bearing, the wheel portion includes a hub connected to the shaft portion, a rim surrounding the hub, and a plurality of spokes extending therebetween, wherein each spoke is in the shape of a blade inclined relative to the rotation axis of the rotating member.

9. The transmission device according to claim 8, characterized in that: The transmission device further comprises a cover member, wherein the cover member covers the rotating member, and the cover member comprises a grid wall portion, wherein the grid wall portion is located on one axial side of the rotating member.

10. A garden tool, characterized in that: The garden tool comprises a transmission device according to any one of claims 1 to 9.

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