Spare tire cover

Abstract

Provided is a spare tire cover that is advantageous for improving durability while ensuring the aerodynamic performance of a vehicle.　When the vehicle is traveling, traveling wind F including foreign matter such as mud or sand flows from front to back under a vehicle floor 12. The traveling wind F, together with the foreign matter, infiltrates the spare tire cover 28 through an opening in a wheel 30 of a spare tire 22. The traveling wind F1 that infiltrates the spare tire cover 28 comes into contact with guide surfaces 4802 of a plurality of fins 48 and is thereby guided to discharge holes 46. The foreign matter contained in the traveling wind F1 is discharged from a plurality of the discharge holes 46 to the outside of the spare tire cover 28, and thus prevented from being deposited on a bottom surface part 40. The inner diameter of the discharge holes 46 may be small, and the turbulence generated by the discharge holes 46 is sufficiently suppressed as to be negligible.

Description

spare tire cover

[0001] The present invention relates to a spare tire cover.

[0002] A spare tire cover that covers from below a spare tire supported below a vehicle floor has been proposed (see Patent Document 1). This spare tire cover is provided to prevent turbulence caused by interference with the unevenness of the spare tire when the vehicle is moving, and to straighten the wind flowing below the vehicle floor, thereby reducing air resistance and suppressing lift generated by the wind, in other words, to ensure the aerodynamic performance of the vehicle.

[0003] Japanese Patent Application Laid-Open No. 2006-341642

[0004] However, in the above-described conventional technology, wind generated when the vehicle is moving flows through the space between the vehicle floor and the spare tire, allowing foreign matter such as mud and sand contained in the wind to enter the gap between the wheel and the spare tire cover through the opening in the spare tire wheel. Foreign matter that enters between the wheel and the spare tire cover accumulates on the bottom surface of the spare tire cover, raising concerns that the accumulated foreign matter may corrode the spare tire cover or cause rust on the spare tire cover, resulting in deterioration of the spare tire cover. The present invention has been developed in consideration of the above circumstances, and aims to provide a spare tire cover that is advantageous in terms of improving durability while maintaining the aerodynamic performance of the vehicle.

[0005] To achieve the above object, one embodiment of the present invention provides a spare tire cover that covers a spare tire supported below a vehicle floor from below, the spare tire cover including: a discharge hole provided in a bottom surface of the spare tire cover facing the spare tire, the discharge hole passing through the bottom surface to discharge foreign matter that has entered the spare tire cover; and a fin that protrudes upward from the bottom surface and extends in a radial direction of the spare tire to guide wind that has entered the spare tire cover toward the discharge hole. Another embodiment of the present invention is characterized in that the fin is tapered toward the discharge hole. Another embodiment of the present invention is characterized in that multiple discharge holes are arranged in a ring shape at regular intervals, and multiple fins extend radially from the center of the spare tire cover toward the discharge hole. Another embodiment of the present invention is characterized in that the fin extends in a curved manner toward the discharge hole. In one embodiment of the present invention, the fin has a convex cross section cut along a plane perpendicular to its extension direction, the inner curved surface of the two surfaces being a guide surface that guides traveling wind to the exhaust hole, and the exhaust hole is located on the inner curved tip of the fin. In another embodiment of the present invention, the bottom surface abuts against the sidewall of the spare tire, and the exhaust hole and the fin are located radially inward from a portion of the bottom surface that abuts against the sidewall of the spare tire. In another embodiment of the present invention, the exhaust hole is located near the radially inner side of the portion of the bottom surface that abuts against the sidewall of the spare tire. In one embodiment of the present invention, the spare tire cover comprises a cylindrical portion rising from the center of the bottom portion and a top portion connecting the tip of the cylindrical portion and fixed to a hub mounting portion of the spare tire, the discharge holes are arranged in a ring shape surrounding the cylindrical portion, and the fins extend from the cylindrical portion radially outward toward the discharge holes.

[0006] According to one embodiment of the present invention, the wind that enters the spare tire cover strikes the multiple fins and is guided to the exhaust port. Therefore, foreign matter contained in the wind is discharged to the outside of the spare tire cover through the multiple exhaust ports, preventing the foreign matter from accumulating on the bottom surface and suppressing corrosion and rust of the spare tire cover due to accumulated foreign matter, which is advantageous for improving the durability of the spare tire cover. Furthermore, because the wind guided to the exhaust port by the fins efficiently discharges foreign matter from the exhaust port, the inner diameter of the exhaust port can be small. Therefore, turbulence generated by the exhaust port is suppressed to a negligible level, which is advantageous for ensuring the aerodynamic performance of the vehicle. Furthermore, if the fins are tapered toward the exhaust port, the fins can efficiently guide the wind that enters the spare tire cover to the exhaust port, further advantageous for efficiently discharging foreign matter through the multiple exhaust ports. Furthermore, if multiple exhaust holes are arranged in a ring shape at regular intervals and multiple fins extend radially from the center of the spare tire cover toward the exhaust holes, the fins can efficiently guide the traveling wind that has entered the spare tire cover to the exhaust holes, which is more advantageous for efficiently expelling foreign matter through the multiple exhaust holes. Furthermore, if the fins extend in a curved shape toward the exhaust holes, the fins can efficiently guide the traveling wind that has entered the spare tire cover to the exhaust holes, which is more advantageous for efficiently expelling foreign matter through the multiple exhaust holes. Furthermore, if the fins have a convex cross-section cut along a plane perpendicular to their extension direction, which has two surfaces, the inner surface of the curve serves as a guide surface that guides the traveling wind to the exhaust holes, and the exhaust holes are positioned inside the curve at the tips of the fins, the fins can efficiently guide the traveling wind that has entered the spare tire cover to the exhaust holes, which is more advantageous for efficiently expelling foreign matter through the multiple exhaust holes. Furthermore, the fins also function as reinforcing ribs on the bottom surface, which is advantageous for securely holding the spare tire.Furthermore, if the bottom surface abuts against the sidewall of the spare tire and the discharge holes and fins are provided radially inward from the portion of the bottom surface that abuts against the sidewall of the spare tire, the fins and the wall formed by the sidewall can efficiently guide the traveling wind that has entered the spare tire cover to the discharge holes, which is more advantageous for efficiently discharging foreign matter through the multiple discharge holes. Furthermore, if the discharge holes are provided near the radially inner side of the portion of the bottom surface that abuts against the sidewall of the spare tire, the traveling wind that has entered the spare tire cover can be efficiently guided toward the discharge holes located near the wall formed by the sidewall, which is even more advantageous for efficiently discharging foreign matter through the multiple discharge holes. Furthermore, if the spare tire cover has a cylindrical section rising from the center of the bottom section and a top section connecting the tip of the cylindrical section and fixed to the spare tire hub mounting section, multiple exhaust holes arranged in an annular shape surrounding the cylindrical section, and multiple fins extending radially outward from the cylindrical section toward the exhaust holes, the fins on the bottom section can efficiently guide running wind that has entered the spare tire cover into the multiple exhaust holes on the bottom section within the cylindrical space surrounded by the outer circumferential surface of the cylindrical section, the wheel rim section 34, and the bottom section, which is advantageous for efficiently discharging foreign matter through the multiple exhaust holes. Furthermore, the spare tire does not interfere with the fins, which is advantageous for easy installation and removal of the spare tire.

[0007] It is a cross-sectional view of the spare tire cover according to the embodiment, seen from the vehicle width direction at the rear of the vehicle, a perspective view of the spare tire cover according to the embodiment, a plan view of the spare tire cover according to the embodiment, and a bottom view of the spare tire cover according to the embodiment.

[0008] A spare tire cover according to an embodiment of the present invention will now be described with reference to the drawings. In the following drawings, the symbol FR indicates the front of the vehicle, and the symbol UP indicates the top of the vehicle. As shown in FIG. 1 , a vehicle 10 includes a vehicle floor (floor panel) 12 extending rearward and transversely of the vehicle, with a passenger compartment 14 located above the vehicle floor 12. In this embodiment, a propeller shaft 16 extending in the fore-and-aft direction of the vehicle is provided below the vehicle floor 12. The propeller shaft 16 connects a transmission (not shown) to a differential gear 18 located at the rear of the vehicle, and transmits driving force from an engine (not shown) to the rear wheels via the differential gear 18. A spare tire cover 28 is provided below the vehicle floor 12 at the rear of the vehicle and behind the differential gear 18, covering from below a spare tire 22 supported below the vehicle floor 12.

[0009] The structure for storing the spare tire 22 includes a winch 24, a hanging plate 26, and a spare tire cover 28. The spare tire 22 includes a wheel 30 and a tire body 32 attached to the wheel 30. The wheel 30 includes a rim portion 34 to which the tire body 32 is attached, and a disc portion 36. The disc portion 36 is located radially inward of the rim portion 34, and is provided with a plurality of openings (not shown) spaced circumferentially. The disc portion 36 is provided with a hub mounting portion 38 attached to the hub of the axle on its inner periphery. The hub mounting portion 38 is provided with a hub hole 3802 at its center for mounting the hub, and a plurality of bolt holes 3804 at equal intervals around the axis of the hub hole 3802 on its outer periphery for fastening the hub mounting portion 38 to the hub via bolts.

[0010] The tire body 32 includes a bead portion 3202 attached to the rim portion 34, a tread portion 3204 that comes into contact with the road surface, and sidewalls 3206 on both sides of the tread portion 3204.

[0011] The winch 24 is attached to the underside of the vehicle floor 12 behind the differential gear 18. The winch 24 is equipped with a chain 2402 that is wound up or unwound using a handle (not shown) that is detachably connected to the winch 24. The hanging plate 26 is attached to the end of the chain 2402. The hanging plate 26 is configured to be insertable through a hub hole 3802 of the tire body 32 and a center hole 4402 of a spare tire cover 28 (described later), and to be engageable with the edges of the hub hole 3802 and the center hole 4402 from below. After the hanging plate 26 is inserted from above into the hub hole 3802 and the center hole 4402, the chain 2402 is wound up by the winch 24 while the hanging plate 26 is engaged from below with the edge of the hub hole 3802 and the edge of the center hole 4402, and the upward-facing part of the spare tire 22 abuts against a tire stopper (not shown) provided on the vehicle floor 12, so that the spare tire 22 and the spare tire cover 28 are supported below the vehicle floor 12 so that they cannot move.

[0012] 1 to 4, the spare tire cover 28 includes an annular bottom surface portion 40 that faces the spare tire and on which the sidewall 3206 of the spare tire 22 is placed, a cylindrical portion 42 that stands upright from the center of the bottom surface portion 40, and a top surface portion 44 that connects the tip of the cylindrical portion 42 and is fixed to the hub mounting portion 38 of the spare tire 22. The spare tire cover 28 is made of metal or synthetic resin. The top surface portion 44 has a central hole 4402 formed in its center through which the hanging plate 26 is inserted, and the outer periphery has locking pins 4404 formed on the outer periphery that are inserted into multiple bolt holes 3804 of the hub mounting portion 38. The outer periphery of the bottom surface portion 40 has a curved edge 4406.

[0013] The spare tire cover 28 is provided with a plurality of exhaust holes 46 for exhausting foreign matter that has entered the spare tire cover 28 to the outside, and is also provided with fins 48 for directing running wind that has entered the spare tire cover 28 to the exhaust holes 46. The plurality of exhaust holes 46 penetrate the bottom surface portion 40 and are provided at equal intervals in the circumferential direction on a single imaginary circle in the bottom surface portion 40. In other words, the plurality of exhaust holes 46 are provided in an annular arrangement at regular intervals, and are provided in an annular arrangement surrounding the cylindrical portion 42. As shown in FIG. 1 , the exhaust holes 46 are provided in positions that are displaced radially inward from the positions where the sidewalls 3206 of the tire main body 32 rest on the bottom surface portion 40. In other words, the discharge holes 46 are provided radially inward from the portion of the bottom surface portion 40 that abuts against the sidewall 3206 of the spare tire 22, and more specifically, the discharge holes 46 are provided near the radially inner side of the portion of the bottom surface portion 40 that abuts against the sidewall 3206 of the spare tire 22. The discharge holes 46 are also arranged on the inner side of the curved tips of fins 48, which will be described later. If the dimension between the inner diameter and outer diameter of the bottom surface portion 40 is defined as the width of the bottom surface portion 40, the multiple discharge holes 46 are provided in the middle portion of the bottom surface portion 40 in the width direction.

[0014] As shown in FIGS. 1 to 4 , the fins 48 protrude upward from the bottom surface portion 40 and extend in the radial direction of the spare tire 22 to guide traveling wind that has entered the spare tire cover 28 toward the exhaust holes 46. Specifically, the fins 48 extend in a curved manner from the center of the spare tire cover 28 toward the exhaust holes 46 between the radially outer side of the cylindrical portion 42 and a location that is displaced radially inward from the location where the sidewall 3206 of the tire main body 32 rests on the bottom surface portion 40. A plurality of fins 48 are provided for each exhaust hole 46, extending from the cylindrical portion 42 toward the exhaust holes 46 on the radially outer side, and are provided radially inward from the portion of the bottom surface portion 40 that abuts against the sidewall 3206 of the spare tire 22. The fins 48 are tapered toward the exhaust holes 46 and extend radially from the center of the spare tire cover 28 toward the exhaust holes 46. As shown in FIGS. 2 and 3 , the fin 48 has a cross-sectional shape, cut along a plane perpendicular to its extension direction, that is a convex V-shape consisting of two surfaces, with the inner curved surface serving as a guide surface 4802 that guides the traveling wind to the exhaust holes 46. As shown in FIGS. 1 and 2 , the height of the fin 48 gradually decreases as it extends radially outward from the bottom surface portion 40. As shown in FIG. 3 , the width of the fin 48, in plan view, gradually decreases from a midpoint between the cylindrical portion 42 and the exhaust holes 46 in the radial direction of the bottom surface portion 40 to a midpoint in the radial direction of the bottom surface portion 40. As shown in FIG. 3 , the tip of the fin 48 that is located at the outermost radial position of the cylindrical portion 42 is located on the outer periphery of the exhaust holes 46. Therefore, the fin 48, including the guide surface 4802, extends from the radially inner end of the bottom surface portion 40 to the widthwise middle of the bottom surface portion 40, and the tip 4804 of the guide surface 4802 is located on the outer periphery of the exhaust holes 46. Therefore, the tip 4804 of the guide surface 4802 is located on the outer periphery of the discharge hole 46 .

[0015] The fins 48 may have the material constituting the spare tire cover 28 filled between their two surfaces, or may not have the material constituting the spare tire cover 28 filled between their two surfaces. In this case, the fins 48 are formed into a convex shape with two wall portions. While various conventionally known structures can be employed for the shape of the fins 48, forming the fins 48 into a convex shape with two wall portions is advantageous in terms of cost reduction because it can be easily formed by press molding when the spare tire cover 28 is made of metal. Furthermore, the fins 48 also function as reinforcing ribs, which are advantageous in terms of securely holding the spare tire 22. Furthermore, since the fins 48 only need to guide the traveling wind that has entered the spare tire cover 28 toward the exhaust port 46, they may be provided on the outer circumferential surface 4202 of the cylindrical portion 42. However, forming the fins 48 on the bottom surface 40 as in this embodiment is advantageous in terms of efficiently directing the traveling wind that has entered the spare tire cover 28 toward the exhaust port 46.

[0016] Next, a method of using the storage structure 20 for the spare tire 22 will be described. When attaching the spare tire 22 and the spare tire cover 28, the hub hole 3802 of the tire body 32 is aligned with the center hole 4402 of the spare tire cover 28, and the locking pins 4404 of the spare tire cover 28 are inserted into the bolt holes 3804 of the wheel 30, so that the sidewall 3206 of the tire body 32 is placed on the bottom portion 40. Then, the hanging plate 26 is inserted through the hub hole 3802 and the center hole 4402, and the hanging plate 26 is locked to the edges of the hub hole 3802 and the center hole 4402, and the chain 2402 is wound up by the winch 24, so that the spare tire 22 and the spare tire cover 28 are supported below the vehicle floor 12 so as not to move. At this time, the top surface 44 of the spare tire cover 28 abuts against the hub mounting portion 38 of the spare tire 22, and the locking pins 4404 of the spare tire cover 28 are inserted into the bolt holes 3804 of the wheel 30, thereby securely attaching the spare tire cover 28 to the spare tire 22 without any rattle. When using the spare tire 22, the chain 2402 is reeled out by the winch 24 to remove the hanging plate 26 from the spare tire 22 and spare tire cover 28, and the spare tire 22 can then be used.

[0017] Next, the effects of this embodiment will be described. As shown in FIG. 1 , when the vehicle is traveling, traveling wind F containing foreign matter such as mud and sand flows from the front to the rear under the vehicle floor 12. This traveling wind F, along with the foreign matter, enters the spare tire cover 28 through the opening in the wheel 30 of the spare tire 22 at the rear of the vehicle. The traveling wind F1 that has entered the spare tire cover 28 hits the guide surfaces 4802 of the multiple fins 48 and is guided to the exhaust port 46. Specifically, the traveling wind F1 hits the guide surfaces 4802 of the multiple fins 48 and is guided to the multiple exhaust holes 46 within the cylindrical space surrounded by the outer circumferential surface 4202 of the cylindrical portion 42, the rim portion 34 of the wheel 30, and the bottom surface 40. Therefore, foreign matter contained in the traveling wind F1 is discharged to the outside of the spare tire cover 28 through the multiple discharge holes 46, preventing the foreign matter from accumulating on the bottom surface 40 and suppressing corrosion and rust of the spare tire cover 28 due to accumulated foreign matter, which is advantageous in improving the durability of the spare tire cover 28. Furthermore, because the traveling wind guided to the discharge ports 46 by the fins 48 efficiently discharges foreign matter from the discharge holes 46, the inner diameter of the discharge holes 46 can be small. Therefore, turbulence generated by the discharge holes 46 is suppressed to a negligible level, which is advantageous in ensuring the aerodynamic performance of the vehicle 10.

[0018] Even if a single fin 48 is provided, the traveling wind is guided to the exhaust hole 46 within the cylindrical space surrounded by the outer peripheral surface 4202 of the cylindrical portion 42, the rim portion 34 of the wheel 30, and the bottom portion 40, and foreign matter is discharged through multiple exhaust holes 46, which is advantageous for improving the durability of the spare tire cover 28. However, if a fin 48 is provided for each exhaust hole 46 as in this embodiment, it is more advantageous for the traveling wind F1 that has entered the spare tire cover 28 to be efficiently discharged as foreign matter through the multiple exhaust holes 46, which is more advantageous for improving the durability of the spare tire cover 28.

[0019] In addition, in this embodiment, the fins 48 are tapered toward the exhaust holes 46, so that the fins 48 can efficiently guide the traveling wind F1 that has entered the spare tire cover 28 to the exhaust holes 46, which is more advantageous for efficiently exhausting foreign matter from the multiple exhaust holes 46 and for improving the durability of the spare tire cover 28.

[0020] Furthermore, in this embodiment, multiple discharge holes 46 are arranged in a ring shape at regular intervals, and multiple fins 48 extend radially from the center of the spare tire cover 28 toward the discharge holes 46. Therefore, the fins 48 can efficiently guide the traveling wind F1 that has entered the spare tire cover 28 to the discharge holes 46, which is more advantageous for efficiently discharging foreign matter from the multiple discharge holes 46 and for improving the durability of the spare tire cover 28.

[0021] In addition, in this embodiment, the fins 48 extend in a curved manner toward the exhaust holes 46, so that the fins 48 can efficiently guide the traveling wind F1 that has entered the spare tire cover 28 to the exhaust holes 46, which is more advantageous for efficiently exhausting foreign matter from the multiple exhaust holes 46 and for improving the durability of the spare tire cover 28.

[0022] In this embodiment, the fins 48 have a cross-sectional shape formed by two surfaces in a convex shape when cut along a plane perpendicular to their extension direction, and the inner surface of the curve of the two surfaces is a guide surface 4802 that guides the traveling wind to the exhaust holes, and the exhaust holes 46 are located on the inner side of the curve at the tip of the fins 48, so that the fins 48 can efficiently guide the traveling wind F1 that has entered the spare tire cover 28 to the exhaust holes 46, which is advantageous for efficiently discharging foreign matter from the multiple exhaust holes 46 and for improving the durability of the spare tire cover 28. Furthermore, the fins 48 have a cross-sectional shape formed by two surfaces in a convex shape when cut along a plane perpendicular to their extension direction, so that the fins 48 also function as reinforcing ribs for the bottom surface portion 40, which is advantageous for securely holding the spare tire 22.

[0023] Furthermore, in this embodiment, the bottom surface 40 abuts against the sidewall 3206 of the spare tire 22, and the discharge holes 46 and fins 48 are provided radially inward from the portion of the bottom surface 40 that abuts against the sidewall 3206 of the spare tire 22. Therefore, the traveling wind F1 that has entered the spare tire cover 28 can be efficiently guided to the discharge holes 46 by the wall formed by the sidewall 3206 and the fins 48, which is more advantageous in efficiently discharging foreign matter from the multiple discharge holes 46 and in improving the durability of the spare tire cover 28.

[0024] Furthermore, in this embodiment, the discharge holes 46 are provided near the radially inner side of the portion of the bottom surface 40 that abuts against the sidewall 3206 of the spare tire 22, so that the traveling wind F1 that has entered the spare tire cover 28 can be more efficiently guided toward the discharge holes 46 located near the wall formed by the sidewall 3206, which is even more advantageous in efficiently discharging foreign matter from the multiple discharge holes 46 and is even more advantageous in improving the durability of the spare tire cover 28.

[0025] In this embodiment, the spare tire cover 28 includes a cylindrical portion 42 that rises from the center of the bottom portion 40, and a top portion 44 that connects the tip of the cylindrical portion 42 and is fixed to the hub mounting portion 38 of the spare tire 22. A plurality of exhaust holes 46 are provided in an annular arrangement surrounding the cylindrical portion 42, and a plurality of fins 46 extend radially outward from the cylindrical portion 42 toward the exhaust holes 46. Therefore, within the cylindrical space surrounded by the outer circumferential surface 4202 of the cylindrical portion 42, the rim portion 34 of the wheel 30, and the bottom portion 40, the fins 48 provided on the bottom portion 40 can efficiently guide the running wind F1 that has entered the spare tire cover 28 to the plurality of exhaust holes 46 provided on the bottom portion 40. This allows foreign matter to be efficiently discharged through the plurality of exhaust holes 46, which is advantageous for improving the durability of the spare tire cover 28. Furthermore, when the spare tire 22 is attached to or detached from the spare tire cover 28, the spare tire 22 does not interfere with the fins 48, which is advantageous in that the spare tire 22 can be easily attached and detached.

[0026] REFERENCE SIGNS LIST 10 vehicle 12 vehicle floor (floor panel) 14 passenger compartment 16 propeller shaft 18 differential gear 20 spare tire cover 22 spare tire 24 winch 2402 chain 26 hanging plate 28 spare tire cover 30 wheel 32 tire body 3202 bead portion 3204 tread portion 3206 sidewall 34 rim portion 36 disc portion 38 hub mounting portion 3802 hub hole 3804 bolt hole 40 bottom surface portion 42 cylindrical portion 4202 outer circumferential surface 44 top surface portion 4402 central hole 4404 locking pin 4406 curved edge portion 46 discharge hole 48 fin 4802 guide surface 4804 tip F running wind F1 running wind that has entered the spare tire cover

Claims

1. A spare tire cover that covers from below a spare tire supported below a vehicle floor, comprising: a discharge hole provided on a bottom surface of the spare tire cover facing the spare tire, the discharge hole penetrating the bottom surface and discharging foreign matter that has entered the spare tire cover to the outside; and fins that protrude upward from the bottom surface and extend in the radial direction of the spare tire, the fins guiding traveling wind that has entered the spare tire cover toward the discharge hole.

2. The spare tire cover according to claim 1, wherein the fins are tapered toward the exhaust hole.

3. The spare tire cover according to claim 2, characterized in that a plurality of said discharge holes are arranged in a ring shape at regular intervals, and a plurality of said fins extend radially from the center of said spare tire cover toward said discharge holes.

4. The spare tire cover according to any one of claims 1 to 3, wherein the fin extends in a curved shape toward the exhaust hole.

5. The spare tire cover according to claim 4, wherein the fin has a cross section cut at a plane perpendicular to its extension direction, which has a convex shape consisting of two surfaces, and of the two surfaces, the inner surface of the curve is a guide surface that guides the running wind to the exhaust hole, and the exhaust hole is located on the inner side of the curve at the tip of the fin.

6. A spare tire cover as claimed in any one of claims 1 to 5, characterized in that the bottom surface abuts against the sidewall of the spare tire, and the discharge holes and the fins are provided radially inward from the portion of the bottom surface that abuts against the sidewall of the spare tire.

7. The spare tire cover according to claim 6, wherein the discharge hole is provided in the vicinity of the radially inner side of the portion of the bottom surface that abuts against the sidewall of the spare tire.

8. A spare tire cover according to any one of claims 1 to 7, characterized in that the spare tire cover comprises a cylindrical portion rising from the centre of the bottom portion and a top surface portion connecting the tip of the cylindrical portion and fixed to the hub mounting portion of the spare tire, the discharge holes are arranged in a ring shape surrounding the cylindrical portion, and the fins extend in a plurality from the cylindrical portion towards the discharge holes radially outward.

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