CN218244488U - Tire assembly and lawn mower - Google Patents

Abstract

A tire assembly and a lawn mower, the tire assembly includes a hub, a tire and a rim, the hub includes a hub main body and a plurality of first fitting portions, the plurality of first fitting portions are arranged on the outer peripheral surface of the hub main body; the inner peripheral surface of the tire is provided with a plurality of second matching parts, the tire is sleeved on the outer periphery of the hub main body, and the plurality of first matching parts are connected with the plurality of second matching parts in a matching manner; the rim is detachably connected to a side surface of the hub main body and protrudes from an outer circumferential surface of the hub main body to limit the tire from being withdrawn in an axial direction.

Description

Tire assembly and lawn mower

Technical Field

The application relates to an outdoor mowing instrument field, concretely relates to tire subassembly and lawn mower.

Background

With the development of science and technology, the lawn mower has become a key tool for reducing the human input and increasing the labor efficiency. The lawn mower mows grass by using a cutter head rotating at a high speed, and completes a large-area grass cutting task by manual pushing or automatic walking. However, in the working process of the mower, due to complex environmental factors, the phenomenon that tires and hubs are separated easily occurs due to vibration when the mower runs. Moreover, the problem that tires and hubs of most existing mowers are not matched results in more frequent knocking-over phenomenon, so that the mowers are difficult to adapt to various complex working environments.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a tire subassembly and lawn mower, difficult knockover between tire and the wheel hub in this tire subassembly can strengthen the outdoor adaptability of lawn mower.

In order to achieve the purpose of the application, the application provides the following technical scheme:

in a first aspect, the present application discloses a tire assembly for a lawn mower, comprising: a hub including a hub main body and a plurality of first fitting portions provided at an outer peripheral surface of the hub main body; the tire is sleeved on the periphery of the hub main body, and the first matching parts are connected with the second matching parts in a matching manner; and the rim is detachably connected to the side surface of the hub main body and protrudes out of the outer peripheral surface of the hub main body, and is used for limiting the tire to axially withdraw.

In one embodiment, the first fitting portion protrudes from the outer peripheral surface of the hub main body, and the first fitting portion extends in the axial direction of the hub main body; the second matching part is sunken from the inner circumferential surface of the tire to form a groove, the second matching part extends along the axial direction of the tire, and the first matching part is accommodated in the second matching part.

In one embodiment, the second mating portion includes a recess body, the first mating portion is at least partially received within the recess body, and at least a portion of an inner wall of the recess body is spaced apart from the first mating portion.

In one embodiment, the tire includes a plurality of first reinforcing portions and a second reinforcing portion, the second fitting portion is located between two adjacent first reinforcing portions, the second reinforcing portion protrudes from an inner wall of the groove main body, and the second reinforcing portion connects two adjacent first reinforcing portions.

In one embodiment, the first matching portion includes a first sub portion, a first through hole is opened on a surface of the first sub portion facing the rim, and the rim includes a first connecting portion extending into the first through hole.

In one embodiment, the first matching portion further includes a second sub-portion, the rim further includes a second connecting portion, the second connecting portion encloses a connecting groove, an opening of the connecting groove faces the hub, and the second sub-portion at least partially extends into the connecting groove.

In one embodiment, the second sub portion includes a connecting end located at a side of the second sub portion close to the rim, the connecting end having a spacing distance from an outer circumferential surface of the hub main body, and the second connecting portion is fitted over an outer circumference of the connecting end.

In one embodiment, a second through hole is formed in a side, facing the rim, of the connecting end, a fixing guide pillar is formed in the connecting groove, the fixing guide pillar protrudes out of an inner wall of the connecting groove, and the fixing guide pillar extends into the second through hole.

In one embodiment, the periphery of the connecting end is provided with a limiting groove, a limiting column is formed in the connecting groove, the limiting column protrudes out of the inner wall of the connecting groove, and the limiting column extends into the limiting groove.

The plurality of first matching parts are arranged on the hub main body, the plurality of second matching parts are arranged in the tire, and the first matching parts and the second matching parts are connected in a matching mode, so that the connection strength between the tire and the hub can be enhanced, and the knocking-over phenomenon between the tire and the hub can be avoided; and through connecting rim detachable in the side of wheel hub main part to protrusion in the peripheral surface of wheel hub main part, make the rim can be in the axial of wheel hub and restricted the withdrawal of tire, further avoided the knocking over phenomenon of tire and wheel hub.

In a second aspect, the present application further discloses a lawn mower, which includes a chassis, a driving motor and the tire assembly of any one of the first aspect, wherein the driving motor and the tire assembly are both connected to the chassis, the tire assembly is connected to the driving motor, and the driving motor is configured to drive the tire assembly to rotate. The lawn mower has the advantages that the tire and the hub are not easy to slip off, and the lawn mower can adapt to more complex mowing environments.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic view of an embodiment of a lawn mower;

FIG. 2 is a schematic structural view of one embodiment of a tire assembly;

FIG. 3 is a schematic side view of one embodiment of a tire assembly;

FIG. 4 is a schematic structural view of one embodiment of a tire;

FIG. 5 is a schematic cross-sectional structural view of one embodiment of a tire;

FIG. 6 is a schematic cross-sectional structural view of one embodiment of a tire assembly;

FIG. 7 is a schematic structural view of an embodiment of a hub;

FIG. 8 is a schematic structural view of one embodiment of a wheel rim;

FIG. 9 is a side structural schematic view of an embodiment of a hub;

FIG. 10 is a side structural view of an embodiment of a wheel rim;

FIG. 11 is a schematic structural view of one embodiment of a restraint slot and a restraint post.

Description of reference numerals:

10-mower, 100-chassis, 200-tire assembly;

210-hub, 211-hub body, 211A-hub rim portion, 212-first mating portion, 212A-first sub-portion, 212B-second sub-portion, 2121-first through hole, 2122-connecting end, 2123-second through hole, 2123A-retaining groove;

220-tyre, 221-second fitting, 221A-groove body, 221B-opening, 222-first reinforcement, 223-second reinforcement;

230-rim, 231-rim body, 232-first connection, 233-second connection, 233A-connection slot, 2331-fixing guide post, 2331A-retaining post.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments and features of the embodiments described below can be combined with each other without conflict.

Referring to fig. 1, the lawn mower 10 includes a chassis 100, a driving motor and a tire assembly 200, wherein the driving motor and the tire assembly 200 are both connected to the chassis 100, and the tire assembly 200 is connected to the driving motor, and the driving motor is used for driving the tire assembly 200 to rotate. The chassis 100 of the mower 10 may also be provided with a cutter head, which is driven by a motor to rotate to complete a mowing task.

Fig. 2 is a schematic structural diagram of a tire assembly 200 according to an embodiment, and the tire assembly 200 includes a hub 210, a tire 220, and a rim 230. Wherein the hub 210 includes a hub main body 211 and a plurality of first fitting portions 212, the plurality of first fitting portions 212 being provided on an outer circumferential surface of the hub main body 211; the inner peripheral surface of the tire 220 is provided with a plurality of second matching parts 221, the tire 220 is sleeved on the outer periphery of the hub main body 211, and the plurality of first matching parts 212 are connected with the plurality of second matching parts 221 in a matching manner; the rim 230 is detachably coupled to a side of the hub main body 211 and protrudes from an outer circumferential surface of the hub main body 211 to limit the tire 220 from being withdrawn in an axial direction.

Specifically, the hub main body 211 includes two opposite side surfaces, i.e., an inner side surface facing the vehicle body and an outer side surface facing the outside, and an outer peripheral surface, i.e., a surface rolling toward the ground. Referring to fig. 2 and 3, the first mating portion 212 may be a flange protruding from the outer circumferential surface, or may be a groove recessed from the outer circumferential surface. The plurality of first fitting parts 212 may be arranged at equal intervals on the outer circumferential surface. Of course, the plurality of first fitting portions 212 may also be arranged in a plurality of combinations on the outer circumferential surface; for example, three first fitting portions 212 may be provided in a group, and each group of first fitting portions 212 is arranged at equal intervals.

In other embodiments, the first mating portion 212 may also be a combination of flanges and grooves, for example, one or more grooves may be provided between two flanges. Alternatively, one first fitting portion 212 is formed by a combination of a flange and a groove, and is not particularly limited.

The tire 220 includes an inner circumferential surface, and the inner circumferential surface of the tire 220 faces the outer circumferential surface of the hub 210 after the tire 220 is mounted on the hub 210. The second fitting portion 221 may be a groove recessed from the inner circumferential surface, and may also be a flange protruding from the inner circumferential surface. It can be understood that the first mating portion 212 and the second mating portion 221 should be in a mating connection so as to be able to fix the tire 220 on the hub 210, and therefore the specific molding manner of the second mating portion 221 should be determined according to the second mating portion 221.

In one embodiment, referring to fig. 3, the number of the first matching portions 212 and the second matching portions 221 may be the same, that is, the first matching portions 212 and the second matching portions 221 may be connected in a one-to-one correspondence. The connection between the tire 220 and the hub 210 is thus tighter, so that the tire 220 can be prevented from loosening. Of course, in other embodiments, the number of the first matching portions 212 and the second matching portions 221 may be different, for example, a plurality of first matching portions 212 may be correspondingly connected to one second matching portion 221, and the details are not limited.

The rim 230 may be detachably coupled to the outer side of the hub main body 211, and after the rim 230 is detached, the tire 220 may be mounted on the hub 210 in the axial direction of the hub main body 211 or withdrawn from the hub 210; the tire 220 is thereby restrained on the hub 210 after the rim 230 is mounted, thereby preventing the tire 220 from falling off the hub 210.

In one embodiment, the driving motor may be further disposed in the wheel hub 210, and the wheel hub 210 is connected to the transmission shaft and fixed to the chassis 100 through the transmission shaft. The lawn mower 10 can be of a four-wheel structure, so that a driving motor can be arranged in each wheel hub 210, and the power of the lawn mower 10 can be increased, so that the lawn mower can adapt to mowing tasks in various environments.

According to the wheel hub, the plurality of first matching parts 212 are arranged on the wheel hub main body 211, the plurality of second matching parts 221 are arranged in the tire 220, the first matching parts 212 and the second matching parts 221 are matched and connected, so that the connection strength between the tire 220 and the wheel hub 210 can be enhanced, and the phenomenon of knocking over between the tire 220 and the wheel hub 210 can be avoided; and the rim 230 is detachably connected to the side surface of the hub main body 211 and protrudes out of the outer circumferential surface of the hub main body 211, so that the rim 230 can limit the tire 220 from being withdrawn in the axial direction of the hub 210, and the phenomenon of knocking over between the tire 220 and the hub 210 is further avoided.

In one embodiment, referring to fig. 2, the first engaging portion 212 protrudes from the outer circumferential surface of the hub main body 211, and the first engaging portion 212 extends along the axial direction of the hub main body 211; the second fitting portion 221 is recessed from the inner circumferential surface of the tire 220 to form a groove, the second fitting portion 221 extends along the axial direction of the tire 220, and the first fitting portion 212 is received in the second fitting portion 221.

Specifically, the first mating portion 212 and the hub main body 211 may be a unitary structure and extend in the axial direction of the hub main body 211. The first fitting portion 212 may be substantially cylindrical in shape, and its surface facing the outside may be a curved surface; of course, the shape of the first fitting portion 212 may also be square or other shapes, and is not limited in particular. Accordingly, the second fitting portion 221 should be a groove, and the second fitting portion 221 is along the axial direction of the tire 220, so as to be capable of fitting connection with the first fitting portion 212. It is understood that the inner shape of the second fitting portion 221 should be the same as the first fitting portion 212, so that the second fitting portion 221 can be fixed with the first fitting portion 212. Of course, in other embodiments, the inner shape of the second matching portion 221 may also be partially different from the first matching portion 212, that is, the shape of the partial position of the second matching portion 221 is the same as that of the first matching portion 212, so that the connection can be achieved by a partial fitting and fixing manner.

By designing the first matching part 212 to protrude from the outer peripheral surface of the hub main body 211 and the second matching part 221 to form a groove by sinking from the inner peripheral surface of the tire 220, a clamping groove connection mode can be realized between the first matching part 212 and the second matching part 221, and the connection strength between the first matching part 212 and the second matching part 221 is further enhanced.

In one embodiment, referring to fig. 3 and 4, the second matching portion 221 includes a groove main body 221A, at least a portion of the first matching portion 212 is accommodated in the groove main body 221A, and at least a portion of an inner wall of the groove main body 221A has a spacing distance from the first matching portion 212. Specifically, the second fitting portion 221 includes two openings 221B and a groove main body 221A, which are opposite to each other, the two openings 221B are located on two opposite sides of the tire 220 in the axial direction, the groove main body 221A is located between the two openings 221B, and the first fitting portion 212 extends from one opening 221B into the groove main body 221A in the axial direction of the tire 220 and extends from the other opening 221B. Both ends of the first fitting portion 212 should be in contact with the wall surfaces of the two openings 221B, respectively. Also, preferably, the size of the two openings 221B may be slightly smaller than that of the first fitting portion 212, so that the first fitting portion 212 may tightly fix the tire 220 and the hub 210 by the pressure of the elastic deformation after the tire 220 is pressed to be partially deformed.

Further, referring to fig. 5 and 6, the size of the groove main body 221A may be larger than that of the first matching portion 212, so that the inner wall of the groove main body 221A and the outer wall of the first matching portion 212 are not fully fitted. It can be understood that the lawn mower 10 of the present application can be applied to various lawn environments, and during the traveling of the lawn mower 10, the gap between the first fitting portion 212 and the groove body 221A can be used to accommodate the deformation of the tire 220 caused by the rugged road, and by designing the gap, the deformation of the tire 220 can be maximized, thereby achieving the purpose of shock absorption.

In one embodiment, referring to fig. 3 and 4, the tire 220 includes a plurality of first reinforcing portions 222 and second reinforcing portions 223, the second matching portion 221 is located between two adjacent first reinforcing portions 222, the second reinforcing portions 223 protrude from the inner wall of the groove main body 221A, and the second reinforcing portions 223 connect two adjacent first reinforcing portions 222. Specifically, the second fitting portion 221 may be formed by surrounding two adjacent first reinforcing portions 222; or it can be considered that after the second fitting portions 221 are formed on the inner circumferential surface of the tire 220, the adjacent two second fitting portions 221 are separated by the first reinforcing portion 222. The second reinforcing part 223 is formed on the inner wall of the groove main body 221A, and the second reinforcing part 223 serves to connect adjacent two first reinforcing parts 222, thereby supporting the first reinforcing parts 222.

Preferably, a plurality of second reinforcing parts 223 may be formed on an inner wall of one groove body 221A, and the second reinforcing parts 223 may have a spaced distance from the first fitting part 212. Thereby, while maintaining the shock absorbing effect, the support stability of the tire 220 can be enhanced. It is understood that the first reinforcement portion 222 and the second reinforcement portion 223 may be rib structures designed inside the tire 220 and integrated with the tire 220.

By designing the first reinforcement 222 and the second reinforcement 223 within the tire 220, the stability of the tire 220 may be enhanced, enabling the lawn mower 10 to travel over more rugged road segments.

In one embodiment, referring to fig. 7 and 8, the first matching portion 212 includes a first sub-portion 212A, a first through hole 2121 is formed on a surface of the first sub-portion 212A facing the rim 230, the rim 230 includes a first connecting portion 232, and the first connecting portion 232 extends into the first through hole 2121. Specifically, the rim 230 may include a rim main body 231 and a first connection portion 232, the first connection portion 232 may be a bolt, and the first connection portion 232 may be detachably connected with the rim main body 231. For example, the rim body 231 may be formed with a hole for the first connecting portion 232 to pass through and be fixed, and the first matching portion 212 can extend out of the first through hole 2121 after passing through the rim body 231, so as to fix the rim body 231 and the hub 210.

Referring to fig. 9 and 10, fig. 9 is a schematic side view of a hub according to an embodiment, fig. 10 is a schematic side view of a rim, a plurality of first sub-portions 212A may be arranged in a ring array on an outer circumferential surface of the hub 210, and distances between any two first sub-portions 212A are equal. Correspondingly, the first connection parts 232 should also be plural and arranged in a ring array on the rim body 231. The first through hole 2121 may be a threaded hole, such that the first connection portion 232 and the first through hole 2121 are in threaded fit connection.

The first sub-portion 212A and the first connection portion 232 can be used to detachably connect the hub 210 and the rim 230, thereby facilitating the user to remove and replace the tire 220.

In one embodiment, referring to fig. 7 and 8, the first mating portion 212 further includes a second sub-portion 212B, the rim 230 further includes a second connecting portion 233, the second connecting portion 233 encloses the connecting groove 233A, the opening 221B of the connecting groove 233A faces the hub 210, and the second sub-portion 212B at least partially extends into the connecting groove 233A. Specifically, the plurality of second subsections 212B may be arranged in a ring array on the outer circumferential surface of the hub 210, and the distance between any two second subsections 212B is equal. Correspondingly, the second connecting portions 233 should also be plural and arranged in a circular array on the rim main body 231. In the present embodiment, referring to fig. 9, two sides of any one of the second sub-portions 212B are provided with the first sub-portion 212A, so that the first sub-portion 212A and the second sub-portion 212B are jointly fixed and connected to the rim 230.

The second connection part 233 is provided on the rim body 231, and the second connection part 233 and the rim body 231 may be of an integrated structure. When the rim 230 and the hub 210 are coupled, the opening 221B of the coupling groove 233A faces the second sub-portion 212B, so that the second sub-portion 212B can extend into the coupling groove 233A, and the fixed coupling relationship between the rim 230 and the hub 210 is enhanced by the coupling groove 233A holding the second sub-portion 212B.

In one embodiment, referring to fig. 7 and 9, the second sub-portion 212B includes a connecting end 2122, the connecting end 2122 is located at a side of the second sub-portion 212B close to the rim 230, the connecting end 2122 is spaced apart from the outer circumferential surface of the hub main body 211, and the second connecting portion 233 is disposed on the outer circumference of the connecting end 2122. Specifically, hub body 211 includes a hub rim portion 211A, hub rim portion 211A being located at one end of hub body 211 opposite to connecting end 2122. The hub rim 211A is recessed toward the axial center of hub 210 at a position opposite to connecting end 2122, so that connecting end 2122 partially extends into the recessed area and connecting end 2122 is spaced apart from the outer peripheral surface surrounding the recessed area. Second connecting portion 233 extends between connecting end 2122 and hub side portion 211A so as to fit around the outer periphery of connecting end 2122.

In one embodiment, the connecting end 2122 is cylindrical in shape and the second connecting portion 233 is also cylindrical; the recess of hub side 211A toward the axial center of hub 210 may be a semicircle having a size larger than that of connection end 2122 so as to have a distance from connection end 2122. After the second connection part 233 is fitted over the outer circumference of the connection end 2122, a part of the outer circumference should be connected to the outer circumferential surface, so that the second connection part 233 is clamped by the hub edge 211A and the connection end 2122 together, thereby increasing the connection strength. Of course, in other embodiments, the connecting end 2122 may also be in the shape of a hexagonal cylinder, and the second connecting portion 233 should also be a hexagonal cylinder, which is not limited in particular.

In one embodiment, referring to fig. 9 and 10, a second through hole 2123 is formed on a side of the connecting end 2122 facing the rim 230, a fixed guide pillar 2331 is formed in the connecting groove 233A, the fixed guide pillar 2331 protrudes from an inner wall of the connecting groove 233A, and the fixed guide pillar 2331 extends into the second through hole 2123. Specifically, the cross-sectional shape of the second through hole 2123 may be hexagonal, and the shape and size of the fixing guide pillar 2331 may be identical to those of the second through hole 2123. After the connecting end 2122 extends into the connecting groove 233A, the fixing guide 2331 extends into the second through hole 2123, so that the fixing guide 2331 is fixedly connected to the connecting end 2122. In order to prevent the connection between the rim 230 and the hub 210 from being loosened due to the vibration of the machine during the traveling or mowing of the lawnmower 10, the connection strength between the rim 230 and the hub 210 can be increased by designing the structure of the inner pin. Of course, in other embodiments, the shapes of the fixing guide pillar 2331 and the second through hole 2123 may be other designs, and are not limited in particular.

In one embodiment, referring to fig. 11, a limiting groove 2123A is formed on the periphery of the connecting end 2122, a limiting post 2331A is formed in the connecting groove 233A, the limiting post 2331A protrudes out of the inner wall of the connecting groove 233A, and the limiting post 2331A extends into the limiting groove 2123A. Specifically, the outer periphery of the attachment end 2122 may be formed with a plurality of retaining grooves 2123A around the outer periphery of the attachment end 2122, the retaining grooves 2123A extending axially of the attachment end 2122. The limiting posts 2331A are formed on the inner wall of the connecting groove 233A and arranged in a circular array, and after the second connecting portion 233 is sleeved on the periphery of the connecting end 2122, the limiting posts 2331A correspondingly extend into the limiting grooves 2123A, so as to increase the connecting strength between the rim 230 and the hub 210.

In other embodiments, a stopper 2331A may be formed on the outer circumference of the connecting end 2122, and a stopper 2123A may be formed in the connecting groove 233A. And are not particularly limited. It is understood that the spacing groove 2123A and the spacing post 2331A are one implementation way to increase the connection strength between the rim 230 and the hub 210, and therefore, the specific design shape or forming manner of the spacing groove 2123A and the spacing post 2331A is not limited.

In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like, are used for describing the orientation or positional relationship based on the drawings, and are only used for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present application.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. A tire assembly for a lawn mower, comprising:

a hub including a hub main body and a plurality of first fitting portions provided on an outer peripheral surface of the hub main body;

the inner peripheral surface of the tire is provided with a plurality of second matching parts, the tire is sleeved on the outer periphery of the hub main body, and the plurality of first matching parts are connected with the plurality of second matching parts in a matching manner; and

and the wheel rim is detachably connected to the side surface of the hub main body and protrudes out of the outer peripheral surface of the hub main body, so that the tire is limited to axially withdraw.

2. A tire assembly as in claim 1, wherein said first engagement portion projects from an outer peripheral surface of said hub body, said first engagement portion extending in an axial direction of said hub body; the second matching part is sunken from the inner circumferential surface of the tire to form a groove, the second matching part extends along the axial direction of the tire, and the first matching part is accommodated in the second matching part.

3. A tire assembly as in claim 2, wherein said second mating portion comprises a recess body, said first mating portion is at least partially received within said recess body, and at least a portion of an inner wall of said recess body is spaced from said first mating portion.

4. A tire assembly as in claim 3, wherein said tire includes a plurality of first reinforcement portions and a second reinforcement portion, said second engagement portion being located between two adjacent first reinforcement portions, said second reinforcement portion protruding from an inner wall of said groove body, said second reinforcement portion connecting two adjacent first reinforcement portions.

5. A tire assembly according to claim 2, wherein said first fitting portion includes a first sub-portion, a side of said first sub-portion facing said rim has a first through hole, said rim includes a first connecting portion, and said first connecting portion extends into said first through hole.

6. A tire assembly as in claim 2, wherein said first mating portion further comprises a second sub-portion, and wherein said rim further comprises a second coupling portion, said second coupling portion enclosing a coupling groove, said coupling groove opening toward said wheel hub, said second sub-portion extending at least partially into said coupling groove.

7. The tire assembly of claim 6, wherein the second sub-portion includes a connecting end located on a side of the second sub-portion adjacent to the rim, the connecting end being spaced from the outer peripheral surface of the hub body, the second connecting portion fitting over an outer periphery of the connecting end.

8. The tire assembly of claim 7, wherein a second through hole is formed in a side of the connecting end facing the rim, a fixing guide post is formed in the connecting groove, the fixing guide post protrudes from an inner wall of the connecting groove, and the fixing guide post extends into the second through hole.

9. The tire assembly of claim 7, wherein the connecting end is formed with a retaining groove at an outer periphery thereof, and a retaining post is formed in the connecting groove and protrudes from an inner wall of the connecting groove, and the retaining post extends into the retaining groove.

10. A lawnmower comprising a chassis, a drive motor and a tyre assembly according to any one of claims 1 to 9, the drive motor and the tyre assembly each being connected to the chassis, the tyre assembly being connected to the drive motor, the drive motor being arranged to drive the tyre assembly in rotation.

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