Tire tread auxiliary device

Abstract

To provide a tire tread auxiliary device which can cope with snowy or all-terrain travel and need no work such as jack-up for attachment.SOLUTION: A tire tread auxiliary device 100 consists of an attaching board 110, an auxiliary pad 120 in which spike pins are embedded, and a fastening wire 130. The attaching board 110 comprises a circular substrate 111 and an arm part 112 to form an engagement hole 113 in a plane part 112A of the arm part 112. The auxiliary pad 120 is provided with a tread part 120A at the center, a fastener 122 at one end, and a hook 123 at the other end. The attaching board 110 is attached between a hub 31 of a vehicle and a hub attaching part 22 of a wheel. The auxiliary pad 120 is attracted to the outer side of a tire 10 with the fastener 122 at one end engaged with the engagement hole 113, and the fastening wire 130 is hooked and fastened to the hooks 123, 123 in this state, so that the auxiliary pad 120 is fixed adjusted to an upper face of a tread surface 10A of the tire 10.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a tire tread assisting device capable of changing the tread surface of a tire according to the purpose of use of a vehicle.

Background Art

[0002] Normally, normal tires optimized for driving performance, durability performance, fuel efficiency performance, etc. are mounted on vehicles such as private passenger cars. However, in winter, instead of normal tires, studless tires suitable for driving on frozen road surfaces and snow-covered road surfaces are mounted. In addition, for vehicles used for leisure purposes such as all-terrain vehicles (so-called "buggy cars"), ATV tires (tires for four-wheel buggies) dedicated to all-terrain vehicles suitable for driving on dirt and sandy areas are mounted.

[0003] In recent years, various tires with higher grip on the road surface have been developed, and by changing the tires according to these usage purposes, optimal driving according to various usage environments becomes possible.

[0004] However, according to various usage environments, it is necessary to change the tires of a private car each time, which is troublesome.

[0005] As a tire tread assisting device that enables driving suitable for special usage environments without changing tires, a non-metallic tire chain used for driving on snow-covered road surfaces and frozen road surfaces has been known conventionally. The non-metallic tire chain is mainly used in regions with little snowfall, and is appropriately attached to the tread surface of normal tires when there is snow or ice on the road surface. By covering the tread surface of the tire with a mesh-like pad (auxiliary pad) in which spike pins are embedded, it grips the road surface. Regarding this non-metallic tire chain, various devices have been made conventionally to facilitate the mounting work.

[0006] A non-metallic tire chain with a device for facilitating the mounting operation has been proposed, for example, in Patent Document 1.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0008] However, in a conventional non-metallic tire chain (tire tread assisting device), auxiliary pads are usually connected to each other by robust metal parts and are connected in a band shape, and it is necessary to attach this band-shaped auxiliary pad to the entire circumference of the tire. Therefore, during the mounting operation, the vehicle has to be jacked up, the band-shaped non-metallic tire chain has to be temporarily fixed to the outer circumference of the tire other than the ground contact surface, the tire has to be rotated while it is temporarily fixed, and then the two ends of the band-shaped auxiliary pad have to be joined and wound around the entire circumference of the tire. Thus, the mounting operation is still laborious and troublesome.

[0009] The present invention has been made in view of such circumstances, and provides a tire tread assisting device capable of easily changing the shape of the tread surface of a tire to another shape according to its usage environment, such as driving on snowy and frozen roads, driving on sandy roads, driving on dirt roads, etc., with a simple operation.

Means for Solving the Problems

[0010] To solve the above problems, the first invention of the present application provides a locking member including a bottom portion formed of a flat plate with a plurality of bolt insertion holes formed in the center, an upper end portion with a plurality of locking holes formed therein, and a connecting portion connecting the bottom portion and the upper end portion; a fastener provided at one end and locked to the locking hole of the locking member, a hook portion provided at the other end, and a plurality of auxiliary pads with a tread portion of a desired shape formed in the center; and a fixing member bridged over the hook portions of the plurality of auxiliary pads to fix the plurality of auxiliary pads. The locking member is disposed between a hub of a vehicle and a hub mounting portion on the wheel side of a tire, a bolt is inserted through the bolt insertion hole from the hub side, and fixed with a nut between the hub and the hub mounting portion. The auxiliary pads are arranged such that the tread portion is aligned with the tread surface of the tire mounted on the tire wheel, the fastener is locked to the locking hole of the locking member, and the fixing member is bridged over and fixed to the hook portion.

[0011] Further, in the second invention of the present application, in the first invention, the connecting portion of the locking member is formed as a plurality of arm portions extending from the bottom portion and integrally formed with the upper end portion. Further, in the third invention of the present application, in the first invention, the upper end portion is formed as an annular flat plate, and the connecting portion of the locking member is formed as a plurality of arm portions extending from the bottom portion and connected to the annular flat plate.

[0012] Further, in the fourth invention of the present application, in the first to third inventions, the desired-shaped tread formed in the center of the tread portion of the auxiliary pad is mesh-shaped and has spike pins embedded therein. Further, in the fifth invention of the present application, in the first to third inventions, the shape of the desired-shaped tread formed in the center of the tread portion of the auxiliary pad is the tread shape of an all-terrain vehicle tire.

Advantages of the Invention

[0013] According to the first invention of the present application, since the fasteners of the auxiliary pads can be respectively locked into the locking holes of the locking members attached between the hub of the vehicle and the tire wheel, each auxiliary pad can be inserted between the tire and the fender of the vehicle, and the fasteners can be easily inserted into the locking holes. Also, if one end of the auxiliary pad is locked to the locking member and the other end is pulled to the outer side of the vehicle, the auxiliary pad can be easily aligned with the tread surface of the tire. At this time, the hook portion at the other end of the auxiliary pad is pulled out to the outer side of the tire, and by simply hanging and tightening a connecting member on this hook portion, the tire tread auxiliary device can be easily installed.

[0014] Also, according to the second invention of the present application, since the locking member can be composed of only a bottom portion and an arm portion, the locking member can be easily manufactured, and the weight of the tire tread auxiliary device can also be reduced. Also, according to the third invention of the present application, since the locking hole is formed in the annular flat plate, the strength of the locking member can be maintained. Also, since the locking hole can be freely formed along the outer periphery of the annular flat plate, the engagement between the fastener of the auxiliary pad and the locking hole becomes easy. Also, according to the fourth invention of the present application, the running performance equivalent to that of the conventional non-metallic tire chain can be easily realized. Also, according to the fifth invention of the present application, the running performance equivalent to that of the all-terrain vehicle tire can be easily realized.

Brief Description of the Drawings

[0015]

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Mode for Carrying Out the Invention

[0016] (First Embodiment) Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 18. FIGS. 1 and 2 are perspective views showing the relationship between each member of the tire tread auxiliary device (non-metallic tire chain device) 100 of the present invention, the wheel 20 of the tire 10, and the axle 30. The tire tread auxiliary device 100 is composed of a mounting plate (locking member) 110, an auxiliary pad 120 with spike pins, and a tightening wire (fixing member) 130.

[0017] Among these, the mounting plate 110 is mounted in a state of being sandwiched between the hub 31 of the axle 30 and the hub mounting portion 22 of the wheel 20 as shown in FIGS. 1 and 2. As shown in FIG. 3, it is composed of a circular substrate (bottom) 111 made of a flat plate, a plurality (the same number as the number of auxiliary pads 120) of leg portions (connecting portions) 112, 112,... extending from the outer peripheral edge of the circular substrate 111 to the upper outer periphery, and flat portions (upper end portions) 112A, 112A,... formed by bending the upper ends of these leg portions 112, 112,..., and its cross section is U-shaped (FIG. 3(c)). A plurality (the same number as the bolts 32 of the hub 31 on the axle side) of insertion holes (bolt insertion holes) 114 are formed at positions corresponding to the bolts 32 on the hub 31 side at the center of the circular substrate 111. In addition, a plurality of locking holes 113, 113,... are formed in the flat portions 112A, 112A,.... These locking holes 113, 113,... are composed of a perfect circular portion with a large diameter and an oval portion with a small diameter on the outer peripheral side thereof. As will be described in detail later, when the auxiliary pads 120 are mounted, the fasteners 122 are locked within these locking holes 113, 113,... (see FIG. 9).

[0018] The shape (U-shaped cross section) of the mounting plate 110 is determined according to the shape of the inner side of the rim 21 of the wheel 20 to which the mounting plate 110 is mounted. That is, as shown in the cross-sectional view of FIG. 4, when the mounting plate 110 is fixed between the hub 31 of the axle 30 and the hub mounting portion 22 of the wheel 20, the mounting plate 110 is arranged along the inner surface of the rim 21 (so as not to contact the brake shoe or the like). At this time, the cross-sectional shape of the flat portion 112A at the upper end of the leg portion 112 is determined so that a gap space is formed between the flat portion 112A and the rim 21 of the wheel 20 (the gap within the two-dot chain line W in FIG. 4).

[0019] FIG. 5 shows the mounting method of the mounting plate (locking member) 110. As shown in the figure, a plurality of (four in the illustrated example) insertion holes 114, 114,... are formed in the center of the circular substrate (bottom) 111 of the mounting plate 110. These insertion holes 114, 114,... are accommodated along the inner surface of the rim 21 in a state where they are aligned with the bolt holes 22a, 22a,... of the wheel 20 (Fig. 5(a)). In this state, the bolt 32 of the axle 30 passes through the insertion hole 114 of the mounting plate 110 and the bolt hole 22a, and a nut 33 is screwed onto the tip of the passed bolt 32 (Fig. 5(b)), and the mounting plate 110 is fixed between the hub 31 on the axle side and the hub mounting portion 22 of the wheel 20 (Fig. 5(c)).

[0020] Next, the auxiliary pad (pad with spike pins) 120, which is a main part of the tire tread auxiliary device 100, will be described with reference to Figs. 6 and 7. The auxiliary pad 120 is provided with a tread portion 120A of a desired shape (mesh shape) at the center. One end of this auxiliary pad 120 is an inner mounting portion 120B, and the other end is an outer mounting portion 120C. A fastener 122 is provided on the inner mounting portion 120B, and hooks (hooking portions) 123, 123 are provided on the outer mounting portion 120C. When mounting the auxiliary pad 120 on the tread surface 10A of the tire 10, a tightening wire (fixing member) 130 is hung on each hook 123, 123, and by using a telescoping device 131 to contract the entire length of the tightening wire 130, each hook 123, 123,... is attracted toward the center of the tire 10. By this attracting operation, the tread portion 120A of the auxiliary pad 120 is fixed to the tread surface 10A of the tire 10.

[0021] Fig. 6(a) is a plan view showing the front surface (the ground contact surface side where the spike pins 121, 121,... are embedded) of the auxiliary pad 120, and Fig. 6(b) is a plan view showing the back surface (the surface in contact with the tread surface 10A of the tire 10). The auxiliary pad 120 is a mesh-shaped resin pad made of thermoplastic polyurethane resin, and the spike pins 121, 121, … in the central part (tread part 120A) grip the snow-covered / frozen road surface.

[0022] The fastener 122 attached to the inner attachment part 120B, which is one end of the auxiliary pad 120, is inserted into the locking hole 113 of the mounting plate 110 as will be described in detail later (Fig. 9). On the other hand, the outer attachment part 120C, which is the other end of the auxiliary pad 120, has a tip that is bifurcated into a U-shape, and hooks (hanging parts) 123, 123 are attached to each of them.

[0023] Next, with reference to Figs. 8 to 13, the procedure for attaching the four auxiliary pads 120, 120, … to the tire 10 will be described. First, one end (inner attachment part 120B) of the first auxiliary pad 120 is fixed to the side of the mounting plate 110 on the inner side of the tire 10. In this case, the inner attachment part 120B of the auxiliary pad 120 is inserted from the outer side to the inner side, and the fastener 122 of the inner attachment part 120B is inserted into the locking hole 113 of the mounting plate 110 (Fig. 9(a)). Then, the entire auxiliary pad 120 is pulled to the outer side (the direction of the arrow in Fig. 8, the direction of the arrow in Fig. 9(b)).

[0024] By this series of operations, as shown in Fig. 9(b), the fastener 122 inserted into the circular part of the locking hole 113 is pulled outward within the locking hole 113. As a result, the constricted part of the fastener 122 moves to the outer peripheral side within the oval part having a smaller diameter than the circular part and is locked (Fig. 9(c)). When removing the auxiliary pad 120 from the mounting plate 110, if the inner attachment part 120B is pushed inward and then pulled upward, the fastener 122 can be easily removed from the locking hole 113.

[0025] With the inner mounting portion 120B fixed to the mounting board 110, when the outer mounting portion 120C of the auxiliary pad 120 is pulled out to the outside (outer side) of the fender 40 (arrow in FIG. 10), the hooks 123, 123 of the outer mounting portion 120C are pulled out to the outer side surface of the tire 10.

[0026] After the outer mounting portion 120C of the first auxiliary pad 120 is pulled out, the second auxiliary pad 120 is similarly attached with the inner mounting portion 120B to the mounting board 110, and the outer mounting portion 120C is pulled out to the outer side surface of the tire 10 (FIGS. 11(a)(b)). When these operations are performed for all four auxiliary pads 120, the four outer mounting portions 120C are pulled out to the outer side surface of the tire 10 (FIG. 12(a)).

[0027] With the tightening wire 130 hung on the hooks 123, 123, 123, 123, 123, 123, 123, 123 of the four auxiliary pads 120 in this state and tightened by the telescopic device 131, the tread portions 120A, 120A,... of the four auxiliary pads 120, 120, 120, 120 are fixed to the tread surface 10A of the tire 10 (FIG. 12(b)). Among the four auxiliary pads 120, 120,..., the two auxiliary pads 120, 120 located on the lower side are separated from each other by a certain distance. Therefore, as shown in FIG. 11(C), even when the tire 10 is in contact with the ground, these two auxiliary pads 120, 120 located on the lower side can be attached to the tread surface 10A of the tire 10 without rotating the tire 10. Thus, in this embodiment, all four auxiliary pads 120, 120,... can be easily attached to the tread surface 10A of the tire 10 without rotating the tire 10.

[0028] Note that if the steering wheel (not shown) of the vehicle is operated to turn the tire 10 in the direction indicated by the arrow in FIG. 12(b), for example, the distance between the fender 40 and the tire 10 will increase, making it easier to attach the inner mounting portion 120B to the mounting board 110.

[0029] FIG. 13 is a diagram for explaining the operation of the telescopic device 131 provided in the tightening wire 130. FIG. 13(a) shows the state where the telescopic device 131 is extended, and FIG. 13(b) shows the state where it is contracted. When hanging the tightening wire 130 on the hooks 123, 123,..., the telescopic device 131 is extended.

[0030] After the operation of hanging the tightening wire 130 on the hooks 123, 123,... is completed, three claw portions (not shown) of a mounting handle (not shown) are fitted into the three handle holes 131d, 131d, 131d provided in the rotating plate 131a of the telescopic device 131. In this state, if the mounting handle is rotated, the rotating plate 131a rotates clockwise in the figure, and the U-shaped metal bars 131b, 131b are fitted into the recesses formed in the rotating plate 131a and locked, and the telescopic device 131 is held in the contracted state (FIG. 13(b)). When removing the tightening wire 130 from the hook 123, the rotating plate 131a (FIG. 13(b)) in the contracted state may be rotated counterclockwise in the figure with a mounting handle (not shown) (FIG. 13(a)).

[0031] FIG. 14(a) is a cross-sectional view showing a state where the four auxiliary pads 120 are mounted on the tread surface 10A of the tire 10 and fixed with the tightening wire 130, and FIG. 14(b) is an enlarged view of the portion W surrounded by the two-dot chain line in FIG. 14(a). The end of the flat portion 112A on the mounting plate 110 side is supported in a state of abutting against the flange (rim flange) 23, and a gap space P is formed below the flat portion 112A. By forming the gap space P between the rim 21 and the flat portion 112A in this way, a space is secured below the locking hole 113 (on the rim 21 side), and the fastener 122 of the inner mounting portion 120B can be easily inserted into the locking hole 113.

[0032] FIG. 15(a) shows an example in which, when attaching the tire tread assist device 100, hooks 123, 123, 123, 123 of two opposing auxiliary pads 120, 120 out of the four auxiliary pads 120, 120, 120, 120 are attached to the tightening wire 230 in advance. First, attach the inner attachment portions 120B of the two opposing auxiliary pads 120, 120 attached to the tightening wire 230 to the mounting plate 110 (FIG. 15(b)).

[0033] Next, attach the inner attachment portions 120B, 120B of the other two auxiliary pads 120, 120 to the mounting plate 110 (arrow in FIG. 15(b)), and by pulling the outer attachment portions 120C, 120C and folding them onto the tread surface 10A of the tire 10, the hooks 123, 123, 123, 123 are positioned on the outer side surface of the tire 10 (FIG. 15(c)). The hooks 123, 123, 123, 123 of the other two auxiliary pads 120, 120 that are attached later can be easily hooked onto the tightening wire 230 to which the hooks 123, 123,... of the two auxiliary pads 120, 20 are already attached. From this state, if the tightening reel 231 is operated to contract the tightening wire 130, all four auxiliary pads 120, 120, 120, 120 are simultaneously fixed to the tread surface 10A of the tire 10. Also in this example, by separating the two auxiliary pads 120, 120 located on the lower side from each other by a certain distance among the auxiliary pads 120, 120,..., the tire 10 can be attached to the tread surface 10A of the tire 10 without rotating the tire 10 even when the tire 10 is in contact with the ground (see FIG. 11(C)). Note that the tightening reel 231 for expanding and contracting the tightening wire 230 is a known device, and a detailed description thereof is omitted. The tightening reel is disclosed, for example, in Japanese Patent No. 5344499.

[0034] FIG. 16 shows an example in which, when attaching the tire tread assist device 100, all the hooks 123, 123,... of the four auxiliary pads 120, 120, 120, 120 are attached in advance to a sufficiently long tightening wire 230. As shown in Fig. 16(a), if all the hooks 123, 123,... of the four auxiliary pads 120, 120, 120, 120 are attached to the tightening wire 230, then during the installation operation, first, the inner mounting parts 120B, 120B of two mutually opposed auxiliary pads 120, 120 are attached to the mounting plate 110 side (Fig. 16(b)), and then the inner mounting parts 120B, 120B of the remaining two auxiliary pads 120, 120 can be easily attached to the mounting plate 110 side.

[0035] After all the inner mounting parts 120B, 120B,... of the four auxiliary pads 120, 120,... are attached to the mounting plate 110 side, by shrinking the tightening wire 230 with the tightening reel 231, the four auxiliary pads 120, 120,... can be easily fixed to the tread surface 10A of the tire 10.

[0036] Figs. 17 and 18 are a plan view and a perspective view showing an ATV-compatible tread pad (auxiliary pad) 320 that is attached in place of the auxiliary pad 120 of the tire tread auxiliary device 100 (non-metallic tire chain device) in order to use the tire tread auxiliary device as an ATV-compatible tread auxiliary device. As shown in these figures, the ATV-compatible tread pad 320 has a convex pattern (ATV convex part) 321 for all-terrain vehicles with a large step formed in the central tread part (pad center) 320A. The ATV-compatible tread pad 320 with the ATV convex part 321 formed in the center in this way has the fastener 322 of the inner mounting part 320B locked to the locking hole 113 of the mounting plate 110. With each inner mounting part 320B of the plurality of ATV-compatible tread pads 320 attached to the mounting plate 110, the hooks 323,... of these plurality of ATV-compatible tread pads 320 are connected by the tightening wire 130 on the outer mounting part 320C side and tightened, whereby these ATV-compatible tread pads 320 are fixed to the tread surface 10A of the tire 10. By attaching the ATV-compatible tread pad 320 to the tire 10, it is possible to achieve running performance equivalent to that of an all-terrain vehicle tire while keeping the tire (normal tire) 10 mounted.

[0037] (Second Embodiment) FIG. 19 is an explanatory diagram showing a cross-section U-shaped mounting plate (locking member) 410 that is attached between the hub mounting portion 22 of the wheel 20 and the hub 31 of the axle 30, instead of the above-described mounting plate (locking member) 110. As shown in FIG. 19(a), the mounting plate 410 is composed of a circular substrate (bottom portion) 411, four arm portions (connecting portions) 412, 412,... that extend from the circular substrate to the upper outer periphery, and an annular flat plate (upper end portion) 415 that is continuous with the tips of the arm portions 412, 412,.... Here, the annular flat plate 415 may be attached to the arm portions 412, 412,... by welding, or a metal plate may be integrally formed into the circular substrate 411, the arm portions 412, and the annular flat plate 415 by sheet metal working. A large number (16 in the illustrated example) of locking holes 413, 413,... are formed in this annular flat plate 415. Note that the shape of the locking hole 413 is the same as the shape of the locking hole 113 of the mounting plate 110 (see FIG. 9).

[0038] By providing a large number of locking holes 413, 413,... in the annular flat plate 415 provided at the tips of the leg portions 412, 412,..., the number of attachable auxiliary pads 120 is not limited to four, and can be appropriately set to the necessary number. In addition, since a large number of locking holes 413, 413,... are provided, the number of places where the inner mounting portion 120B can be attached increases, and the mounting position of the auxiliary pad 120 can be freely selected. Also, it becomes possible to increase the number of fasteners 122 provided on one auxiliary pad 120.

[0039] In this embodiment, an example is shown in which insertion holes 114, 114,... and insertion holes 414, 414,... are formed in the bottom portion 111 made of a flat plate of the mounting plate 110 and the bottom portion 411 made of a flat plate of the mounting plate 410. However, while maintaining the strength of the bottom portions 111, 411, a large number of holes may be provided to achieve weight reduction.

[0040] In addition, in this embodiment, since the number of legs 112 of the mounting plate 110 is four, the number of auxiliary pads 120 to be mounted is also four. However, the number of legs 112 can also be another number, for example, three. In addition, in this embodiment, as the fixing member, the tightening wire 130 having the telescopic device 131 and the tightening wire 230 having the tightening reel 231 are shown. However, an existing annular rubber may be hung on the hook 123, and the auxiliary pad 120 may be fixed to the tread surface 10A of the tire 10 by its elasticity.

[0041] In addition, in this embodiment, as the auxiliary pad, a tread with spike pins made of thermoplastic polyurethane resin is taken as an example for explanation. However, as long as the grip on snow can be realized, it is not limited to these materials.

Industrial Applicability

[0042] The present invention is used as a tire tread auxiliary device to be mounted on a vehicle tire, but is also applicable to the wheels of any other moving means for fixing the wheels to the axles.

Explanation of Reference Numerals

[0043] 10 Tire 10A Tread surface 20 Wheel (tire wheel) 21 Rim 22 Hub mounting portion 23 Flange 30 Axle 31 Hub 32 Bolt 33 Nut 40 Fender 100 Tire tread auxiliary device 110 Mounting plate (locking member) 111 Circular substrate (bottom) 112 Leg (connecting portion) 112A Flat portion (upper end) 113 Locking hole 114 Insertion hole (bolt insertion hole) 120 Auxiliary Pad 120A Tread Portion 120B Inner Mounting Portion 120C Outer Mounting Portion 121 Spike Pin 122 Fastener 123 Hook (Hanging Portion) 130 Tightening Wire (Fixing Member) 131 Telescopic Device 230 Tightening Wire (Fixing Member) 231 Tightening Reel 320 ATV-Compatible Tread Pad (Auxiliary Pad) 320A Tread Portion 321 ATV Protrusion 410 Mounting Plate (Locking Member) 411 Circular Substrate (Bottom) 412 Leg (Connecting Portion) 413 Locking Hole 414 Insertion Hole (Bolt Insertion Hole) 415 Annular Flat Plate (Upper End)

Claims

1. A locking member including a bottom portion made of a flat plate having a plurality of bolt insertion holes formed in the center, an upper end portion having a plurality of locking holes formed therein, and a connecting portion connecting the bottom portion and the upper end portion; a plurality of auxiliary pads each having a fastener at one end thereof that is engaged with the fastening hole of the fastening member, a hook at the other end thereof, and a tread portion having a desired shape formed at the center thereof; a fixing member that is hung on the hook portions of the plurality of auxiliary pads and fixes the plurality of auxiliary pads, The locking member is disposed between a hub of a vehicle and a hub mounting portion of a tire wheel, a bolt is inserted into the bolt insertion hole from the hub side, and the locking member is fixed between the hub and the hub mounting portion with a nut, The tire tread auxiliary device is characterized in that, when the tread portion of the auxiliary pad is aligned with the tread surface of the tire mounted on the tire wheel, the fastener is engaged with the engaging hole of the engaging member, and the fixing member is hung on the hook portion and fixed.

2. 2. The tire tread assisting device according to claim 1, wherein the connecting portion of the locking member is made up of a plurality of arms extending from the bottom portion and integrally formed with the top end portion.

3. The upper end of the locking member is formed of an annular flat plate, 2. The tire tread assist device according to claim 1, wherein the connecting portion of the engaging member comprises a plurality of arms extending from the bottom and connected to the annular flat plate.

4. 4. The tire tread auxiliary device according to claim 1, wherein the desired shape of the tread formed in the center of the tread portion of the auxiliary pad is a mesh shape, and spike pins are embedded in the tread portion.

5. 4. The tire tread auxiliary device according to claim 1, wherein the desired shape of the tread formed in the center of the tread portion of the auxiliary pad is the tread shape of a tire for an all-terrain vehicle having a large step.

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