Helmet and cheek pad

Abstract

A helmet has a cap body and a pair of cheek pads arranged on the inner side of the cap body. Each cheek pad has a first base portion having a first outer surface located below the lower edge of the cap body, and a second base portion having a second outer surface located behind the first base portion. The first outer surface and the second outer surface constitute a wearing opening of the helmet, and are negative pressure forming surfaces configured to generate a downward pressure on the helmet by the first outer surface being located below the second outer surface. The first base portion and the second base portion have elasticity to expand the wearing opening by a force for expanding the wearing opening and to contract the wearing opening by a force for contracting the wearing opening.

Description

Technical Field

[0001] This disclosure relates to helmets and cheek pads fitted onto helmets. Background Technology

[0002] As a technology for improving wearer comfort in helmets, it is known to have an inner pad on the inside of the helmet body. The inner pad includes a front pad that abuts against the front of the wearer's head, a rear pad that abuts against the back of the wearer's head, a side pad that abuts against the sides of the wearer's head, a top pad that abuts against the top of the wearer's head, and a cheek pad that abuts against the wearer's cheeks. The inner pad deforms in a way that mimics the shape of the wearer's head, improving the fit to the wearer, thereby improving the sense of retention and comfort (see Patent Document 1). Existing technical documents Patent documents

[0003] Patent Document 1: International Publication No. 2013 / 065176 Summary of the Invention The problem that the invention aims to solve

[0004] When a motorcycle or similar vehicle is in motion, the airflow generated by the helmet creates lift, which lifts the helmet upwards. This lift is transmitted from the helmet to the wearer's head, potentially distracting the wearer or reducing driving stability. Therefore, it is desirable to reduce the lift acting on the helmet while riding a motorcycle or similar vehicle. Solution for solving the problem

[0005] One aspect of the disclosed helmet includes a helmet body and a pair of left and right cheek pads disposed on the inner side of the helmet body. Each cheek pad includes: a first bottom having a first outer surface located below the lower edge of the helmet body; and a second bottom having a second outer surface located behind the first bottom. The first outer surface and the second outer surface constitute the wearing opening of the helmet, and the first outer surface being located below the second outer surface constitutes a negative pressure forming surface that generates downward pressure on the helmet. The first bottom and the second bottom have elasticity that allows the wearing opening to expand when subjected to a force for expanding the wearing opening and to shrink when the force is removed.

[0006] One aspect of the disclosed cheek pad is disposed on the inner side of the helmet body, comprising: a first bottom having a first outer surface located below the lower edge of the helmet body when disposed on the helmet body; and a second bottom having a second outer surface located behind the first bottom when disposed on the helmet body. The first outer surface and the second outer surface constitute the wearing opening of the helmet, and the first outer surface being located below the second outer surface constitutes a negative pressure forming surface that generates downward pressure on the helmet. The first bottom and the second bottom have elasticity that allows the wearing opening to expand when subjected to a force for expanding the wearing opening and to shrink when the force is removed. Attached Figure Description

[0007] Figure 1 This is a side view of a helmet according to one embodiment. Figure 2 Viewed from below Figure 1 A 3D image of the cheek pads on the helmet. Figure 3 yes Figure 1 Front view of the helmet's cheek pads. Figure 4 yes Figure 1 A top-down view of the helmet. Figure 5 yes Figure 1 The front view of the helmet. Figure 6 yes Figure 1 The side view of the helmet is a schematic diagram illustrating the airflow during the movement of a motorcycle or similar vehicle. Figure 7 yes Figure 1 The top view of the helmet is a schematic diagram showing the airflow during the movement of a motorcycle or similar vehicle. Figure 8 This is a diagram showing a modified helmet, a side view of a helmet equipped with a chin spoiler. Detailed Implementation

[0008] The following description, in conjunction with the accompanying drawings, describes one embodiment of the helmet and cheek pads. Furthermore, in Figures 1 to 8 In this context, "front," "back," "left," "right," "up," and "down" as the direction viewed from the helmet wearer are expressed as relative to the helmet. Additionally, "front," "back," "left," "right," "up," and "down" when the helmet wearer's viewpoint is on the cheek pads are expressed as relative to the cheek pads.

[0009] like Figure 1 As shown, helmet 1 is a full-face helmet. Helmet 1 has a helmet body 2 and cheek pads 10. The helmet body 2 constitutes the outer shell of the helmet. The helmet body 2 is a hemispherical resin component. The materials constituting the helmet body 2 are selected from, for example, acrylonitrile-butadiene-styrene copolymer (ABS), polycarbonate (PC), and thermosetting resins impregnated with reinforcing fibers.

[0010] Furthermore, the cap body 2 can also house an inner liner 3, which serves as an internal component for absorbing impact. The inner liner 3 has a shape that runs along the inner surface of the cap body 2. The inner liner 3 is made, for example, of a foamed resin such as expanded polystyrene.

[0011] Additionally, the helmet body 2 may also house, for example, a visor 4 that serves as a transparent plate component with light transmission, a mechanism for supporting the visor 4, and a mechanism for operating the visor 4. The visor 4 prevents foreign objects, rain, and wind from flying in from the front from entering the helmet 1, thereby improving the wearer's visual visibility.

[0012] The cheek pads 10 are a pair of inner pads fitted to the inside of the helmet body 2. The pair of cheek pads 10 have a symmetrical shape with an imaginary plane (not shown) located at the center of the helmet 1 in the left-right direction as their plane of symmetry. The cheek pads 10 improve the fit between the helmet 1 and the wearer by contacting the wearer's cheeks when the helmet 1 is worn, thereby increasing wearing comfort. The cheek pads 10 are, for example, composed of a cushioning element such as polyurethane foam and a covering body that covers the cushioning element. The covering body, for example, has a cloth that contacts the wearer's cheeks, a flexible resin plate fixed to the helmet body 2, and a bag-shaped structure made of synthetic leather protruding downwards from the helmet body 2.

[0013] In addition to the cheek pads 10, the helmet 1 may also have, for example, a front pad that abuts against the front of the head and a rear pad 5 that abuts against the back of the head (see reference). Figure 4 The helmet 1 includes side pads that abut against the sides of the head, a top pad that abuts against the top of the head, and various inner pads with a lower resilience than the inner liner 3 on the inside of the helmet body 2. These inner pads improve the cushioning of the head. In addition, the helmet 1 may also include, for example, a chin strap (not shown) for securing the wearer's chin to the helmet.

[0014] The following is for reference Figure 2 and Figure 3 The cheek pads 10 will be described, but for the sake of illustration, only the shape of one of the two cheek pads 10 that are symmetrical in shape will be shown. like Figure 2 and Figure 3 As shown, the cheek pad 10 has a main body portion 11 as the upper part of the cheek pad 10 and a bottom portion 12 as the lower part of the cheek pad 10. The bottom surface of the main body portion 11 is connected to the bottom portion 12.

[0015] The main body 11 has a fabric contact surface 11a that contacts the wearer's cheek, and a flexible resin board fixing surface 11b that faces the inner lining 3. The fixing surface 11b has a shape that mimics the inner surface of the inner lining 3. When the cheek pad 10 is attached to the cap body 2, the main body 11 is located inside the cap body 2, which faces the inner surface of the inner lining 3. In addition, the main body 11 may also have a slit-like gap 11c for the chin strap to pass through.

[0016] The fixing surface 11b is the surface of the plate 16 used to maintain the shape of the cushioning member constituting the main body 11. The surface of the plate 16 constitutes the surface of the main body 11. The plate 16 is made of a flexible resin board constituting the cover. In addition, the plate 16 may also have holes 16a, which are weight-reducing parts for the purpose of weight reduction and reduced elasticity.

[0017] Furthermore, three female buckles 17 are fitted onto the fixing surface 11b. The female buckles 17 are fitted onto the fixing surface 11b in such a way that they protrude from the holes 16a provided in the plate body 16. The cheek pad 10 is fixed to the inside of the inner liner 3 by engaging with the male buckles provided in the inner liner 3 through the female buckles 17. In addition, the number of female buckles 17 and male buckles provided in the inner liner 3 is not limited, and can be more than four or less.

[0018] The bottom 12 extends from the lower front end of the main body 11 toward the lower rear end. The rear end of the bottom 12 extends further rearward than the rear end of the main body 11. In addition, one of the two edges 12a in the left-right direction at the upper end of the bottom 12 has an arc shape along the lower edge of the cap body 2.

[0019] The bottom 12 has a first bottom 13 located at the front of the bottom 12 and a second bottom 14 located at the rear of the bottom 12. The first bottom 13 has an inner surface 13a and a first outer surface 13b. The second bottom 14 has a second outer surface 14a. The inner surface 13a, the first outer surface 13b and the second outer surface 14a are, for example, made of synthetic leather constituting the cover.

[0020] The inner surface 13a is a surface that extends downward from the lower end of the contact surface 11a. The inner surface 13a is a surface that is positioned opposite the wearer's head when the helmet 1 is worn. The inner surface 13a can be a curved surface formed by connecting the arcuate curves that mimic the wearer's cheeks in the front-back direction in the vertical direction, or it can be a flat surface formed by connecting the straight lines that extend in the front-back direction in the vertical direction.

[0021] The first outer surface 13b is a surface extending downward from the side edge 12a, and is an inclined surface extending towards the lower end of the inner surface 13a. The first outer surface 13b is located below the lower edge of the helmet body 2 when the helmet 1 is worn. Furthermore, the first outer surface 13b is located below the second outer surface 14a. The first outer surface 13b can be either a curved surface formed by connecting the arcuate curves extending in the front-rear direction, mimicking the side edge 12a of the bottom 12, downward and inward, or a flat surface formed by connecting straight lines extending in the front-rear direction downward and inward.

[0022] The first base 13, viewed from the front and back, can be a triangular shape that tapers downwards at its apex, a square shape, or a trapezoidal shape that tapers downwards at its apex. The first base 13 has an inner surface 13a and a first outer surface 13b, which can be either a triangular prism extending in the front-back direction or a quadrangular prism extending in the front-back direction. The first base 13 can also have a toothed shape that tapers downwards at its apex. The front surface of the first base 13 can be either a sloped surface sloping downwards and backwards or a vertical surface along the vertical direction. The rear surface of the first base 13 can be either a sloped surface sloping downwards and forwards or a vertical surface along the vertical direction.

[0023] The second bottom 14 is the portion of the bottom 12 of the cheek pad 10 that is located rearward than the first bottom 13. The second bottom 14 has a second outer surface 14a that extends from the rear end of the first bottom 13 to the rear end of the bottom 12. The second outer surface 14a can be positioned at approximately the same height as the lower edge of the helmet body 2 when the helmet is worn, or it can be positioned below or above the lower edge of the helmet body 2.

[0024] Here, the positions of the first outer surface 13b and the second outer surface 14a, and the lifting force 25 acting on the helmet 1 (refer to...) Figure 6 The relationship between the two is explained below. During the movement of a motorcycle, etc., the airflow generated around the helmet 1 causes the helmet 1 to lift off the wearer's head, i.e., lift force 25, to act on the helmet 1. Since the first outer surface 13b is located below the lower edge of the helmet body 2, the airflow passing through the side of the helmet 1 during the movement of the motorcycle, etc., is guided downwards by the first outer surface 13b. At this time, the airflow guided downwards from the side of the helmet 1 by the first outer surface 13b creates a downward pressure 26 (see reference). Figure 6The downward pressure 26 acts on the first outer surface 13b. It is a force that counteracts the lift 25 and pulls the helmet 1 downwards. Furthermore, because the first outer surface 13b is located below the second outer surface 14a, the airflow guided downwards from the first outer surface 13b onto the helmet 1 causes the downward pressure 26 to also act on the second outer surface 14a. As a result, the lift 25 applied to the helmet 1 reduces the amount of downward pressure 26 acting on both the first outer surface 13b and the second outer surface 14a.

[0025] A retaining piece 15 is fitted onto the side edge 12a. The retaining piece 15 is made of a flexible resin component. The retaining piece 15 has a first engaging portion 15a located at the front end of the retaining piece 15 and a second engaging portion 15b located at the rear end of the retaining piece 15. The retaining piece 15 is inserted between the cap body 2 and the inner liner 3, and engages with the engaged portions (not shown) provided on the cap body 2 and the inner liner 3 through the first engaging portion 15a and the second engaging portion 15b, thereby fixing the cheek pad 10 to the cap body 2.

[0026] The side edge 12a of the bottom 12 is fixed to the helmet body 2 and the inner liner 3 by means of a fixing piece 15. The upper surface of the bottom 12 is fixed to the inner liner 3 by means of a female buckle 17 of the main body 11. The bottom 12 is positioned relative to the wearer's posture such that when the helmet 1 is worn, the lower end of the first outer surface 13b protrudes downwards compared to the second outer surface 14a. Regarding the flexibility of the cushioning member constituting the cheek pad 10, the side edge 12a or the upper surface of the bottom 12 can be used as the fixing end, such as making the wearing opening 6 of the helmet 1 (see reference) Figure 4 ) Enlarged cheek pads with 10 bends.

[0027] like Figure 4 As shown, the helmet 1 has a wearing opening 6 for the wearer to wear the helmet 1. The wearing opening 6 is part of the opening in the helmet body 2 and is the opening through which the wearer inserts their head. The wearing opening 6 is defined by the liner 3, the back pad 5, the first bottom 13, and the edge of the second bottom 14.

[0028] At the wearing opening 6, the width D1 between the lower ends of the first outer surfaces 13b of the left and right cheek pads 10 can be either less than or greater than the width D2 between the lower ends of the second outer surfaces 14a of the left and right cheek pads 10. That is, the lower end of the first outer surface 13b can be closer to the center of the wearing opening 6 than the lower end of the second outer surface 14a, or it can be farther away from the center of the wearing opening 6 than the lower end of the second outer surface 14a. The width D1 can also be the smallest in the left-right direction of the wearing opening 6. The rear end of the first bottom 13 can be located either forward or backward from the position of the maximum left-right width D3 in the cap body 2.

[0029] Here, the position of the first outer surface 13b and the drag force 27 acting as resistance on the helmet 1 (refer to...) Figure 6 The relationship between the two is explained below. During the movement of a motorcycle or similar vehicle, the airflow generated around the helmet 1 creates a drag force 27 on the helmet 1. The drag force 27 is a force that pulls the helmet 1 backward relative to the direction of travel. In this embodiment, as an example, the rear end of the first outer surface 13b is positioned in front of the helmet body 2 at its maximum left-right width D3. Even if, for example, the rear end of the first outer surface 13b is positioned behind the helmet body 2 at its maximum left-right width D3, as described above, the lift force 25 can be reduced using the downward pressure 26. However, because the first outer surface 13b is an inclined surface, the length of the first outer surface 13b along the side of the helmet body 2 becomes longer, thereby increasing the drag force 27. Therefore, from the viewpoint of suppressing the increase of the drag force 27, it is preferable that the rear end of the first outer surface 13b is positioned in front of the helmet body 2 at its maximum left-right width D3.

[0030] Alternatively, based on statistical values ​​of human anatomy, the shape of the hat body 2 can be designed such that the position of the maximum left-right width D3 in the width of the hat body 2 is roughly aligned with the center of the wearer's head in the front-back direction. In this case, the first bottom 13 of the cheek pad 10 can be positioned either in front of the wearer's head (i.e., in front of the maximum left-right width D3) or behind it.

[0031] When wearing the helmet 1, the first bottom part 13 and the second bottom part 14 are spread outwards toward the wearing opening 6, so that the wearer's head can pass through the enlarged wearing opening 6. Furthermore, when the force used to enlarge the wearing opening 6 is removed, the enlarged wearing opening 6 shrinks back to its original state due to the elasticity of the buffer portions constituting the first bottom part 13 and the second bottom part 14. That is, the first bottom part 13 and the second bottom part 14 have the elasticity to enlarge the wearing opening 6 and to shrink it when the force used to enlarge it is removed.

[0032] like Figure 5 As shown, the first outer surface 13b protrudes from the lower edge of the helmet body 2 toward the center below the wearing opening 6, thereby narrowing the width of the wearing opening 6 in the lateral direction. In other words, by the first outer surface 13b protruding from the lower edge of the helmet body 2 and by the elasticity of the first outer surface 13b, when viewed from the front of the helmet 1, the first bottom 13 can smoothly fill the step in the lateral direction formed between the wearer's head and the helmet body 2. At this time, the first outer surface 13b can also have a slope or curvature that is gently continuous with the outer surface 2s of the helmet body 2.

[0033] Next, refer to Figure 6 and Figure 7The function of the helmet 1 and cheek pad 10 to which this disclosure applies will be explained. like Figure 6 As shown, when the wearer is wearing helmet 1, the first bottom edge 13 and the second bottom edge 14 are located between the lower edge of the helmet body 2 and the wearer's shoulder. Furthermore, the wearer of helmet 1 assumes a forward-leaning posture while riding a motorcycle or similar vehicle.

[0034] During the movement of a motorcycle or similar vehicle, air passing in front of the helmet 1 flows rearward along the outer surface 2s of the helmet body 2, thereby generating an airflow around the helmet 1. Specifically, an airflow 20 passing above the helmet 1, an airflow 21 passing to the side of the helmet 1, and an airflow 22 passing below the helmet 1, i.e., between the helmet 1 and the wearer's shoulder, are generated around the helmet 1. The airflow 22 includes an airflow 23 that comes into contact with the wearer's chest and flows around the wearer's shoulder. In addition, the airflow 24 in the airflow 21 that passes near the lower edge of the outer surface 2s is guided downward along the first outer surface 13b of the helmet body 2 and merges with the airflow 22 without separating from the helmet 1.

[0035] From the viewpoint of suppressing the airflow 24 from separating from the helmet 1, it is preferable that the first bottom 13 smoothly fills the step formed between the wearer's head and the helmet body 2. Furthermore, from the viewpoint of suppressing the airflow 24 from separating from the helmet 1, it is also preferable that the outer surface 2s of the helmet body 2 and the first outer surface 13b are smoothly continuous.

[0036] The airflow 20 generated during movement causes the helmet 1 to lift off the wearer's head, i.e., lift force 25, to act on the helmet 1. In addition, the airflow 22 and 24 generated during movement cause the helmet 1 to be subjected to a force that eliminates the lift force 25 acting on the helmet 1, i.e., downward force 26, to act on the helmet 1.

[0037] like Figure 7 As shown, the airflow 22 passes beneath the first outer surface 13b and the second outer surface 14a and flows toward the rear of the helmet 1. At this time, corresponding to the amount by which the first outer surface 13b of the cheek pad 10 protrudes from the lower end of the helmet body 2, the airflow 22 travels a longer path, increasing its velocity. Furthermore, a negative pressure is formed on the first outer surface 13b and the second outer surface 14a, generating a downward force 26 that pulls the helmet 1 downwards. That is, the first outer surface 13b and the second outer surface 14a are negative pressure forming surfaces configured to generate the downward force 26 through the negative pressure of the airflow 22.

[0038] Airflow 24 is guided from the outer surface 2s along the first outer surface 13b downwards and merges with airflow 22. Corresponding to the amount by which the first outer surface 13b of the cheek pad 10 protrudes from the lower end of the helmet 2, the negative pressure formed on the first outer surface 13b and the second outer surface 14a increases. Therefore, the downforce 26 generated in the helmet 1 can be increased.

[0039] Furthermore, the lower end of the first outer surface 13b is configured such that it protrudes downward toward the center of the wearing opening 6 more than the lower end of the second outer surface 14a. Therefore, the area of ​​the first outer surface 13b as a negative pressure forming surface is increased, thereby increasing the downward pressure 26 generated in the helmet 1.

[0040] Furthermore, because the first outer surface 13b has a slope that is continuous with the curvature of the outer surface 2s, the airflow 24 will not be stripped from the helmet 1, but will be more reliably guided downwards from the helmet 1. Therefore, the downforce 26 generated in the helmet 1 can be further increased.

[0041] The airflow paths of airflows 22 and 24 are narrowed below the second outer surface 14a due to the wearer's shoulders. This increases the velocity of the airflows 22 and 24, thus further increasing the downforce 26 generated in the helmet 1. At this time, for example, if the rear end of the first outer surface 13b is located behind the wearer's head, the first outer surface 13b is positioned lower than the second outer surface 14a, so the airflow paths of airflows 22 and 24 are excessively narrowed due to the first outer surface 13b and the wearer's shoulders. In this case, the airflows 22 and 24 are less likely to escape towards the rear of the helmet 1, resulting in an increase in drag 27. Therefore, from the viewpoint of suppressing the increase in drag 27, it is preferable that the rear end of the first outer surface 13b is located in front of the wearer's head. For example, if the position in the helmet body 2 where the maximum left-right width D3 is obtained is approximately aligned with the center of the wearer's head in the forward-backward direction, it is preferable that the rear end of the first outer surface 13b is located in front of the position where the maximum left-right width D3 is obtained in the helmet body 2.

[0042] The helmet 1 constructed as described above can achieve the following effects. (1) Because the first outer surface 13b is located below the lower edge of the helmet body 2, the airflow 24 is guided downwards by the first outer surface 13b towards the helmet 1. At this time, the airflow 24 causes a downward pressure 26 to act on the first outer surface 13b. Furthermore, because the first outer surface 13b is located below the second outer surface 14a, the airflow 24 guided downwards by the first outer surface 13b also causes a downward pressure 26 to act on the second outer surface 14a. As a result, the amount of downward pressure 26 acting on the first outer surface 13b and the second outer surface 14a can be reduced by decreasing the lift applied to the helmet 1.

[0043] (2) By having elasticity in the first bottom 13 and the second bottom 14 constituting the wearing opening 6, which expand the wearing opening 6 and shrink it by removing the force used to expand the wearing opening 6, the helmet 1 can be easily worn, and the shape of the deformed negative pressure forming surface is restored after the helmet 1 is worn. Therefore, the lift force 25 applied to the helmet 1 can be reduced, and the helmet 1 can be easily worn.

[0044] (3) By having the lower end of the first outer surface 13b protrude downwards and towards the center of the wearing opening 6 compared to the lower end of the second outer surface 14a, the area of ​​the first outer surface 13b as a negative pressure forming surface becomes larger, which can further increase the downward pressure 26 generated in the helmet 1. Therefore, the lift 25 applied to the helmet can be further reduced.

[0045] (4) Because the first outer surface 13b has a slope that is continuous with the surface of the outer surface 2s, the airflow 24 is more reliably guided downwards towards the helmet 1, thereby increasing the downforce 26 generated in the helmet 1. As a result, the lift 25 applied to the helmet can be reduced.

[0046] (5) The position of the rear end of the first outer surface 13b being at the front of the position of the maximum width D3 on the left and right sides of the cap body 2 can suppress the increase of drag force 27 caused by the length of the first outer surface 13b along the side of the cap body 2.

[0047] (6) The rear end of the first outer surface 13b is located in front of the wearer's head, thereby suppressing the increase in drag 27 caused by excessive narrowing of the airflow paths of airflows 22 and 24 by the first outer surface 13b and the wearer's shoulders.

[0048] Furthermore, the above implementation method can also be implemented with the following appropriate modifications. ·like Figure 8 As shown, the helmet 1 can also be structured with a chin spoiler 30 for the purpose of further reducing lift. Specifically, the helmet 1 has a chin spoiler 30 mounted in front of the lower edge of the helmet body 2. The chin spoiler 30 protrudes downward from the lower edge of the helmet body 2 and has an inclined surface with a slope that is continuous with the curvature of the outer surface 2s. The chin spoiler 30 is fixed to the helmet 1 by inserting its upper edge between the helmet body 2 and the inner liner 3. The chin spoiler 30 has the function of guiding the air received by the helmet 1 from the front to the lower part of the helmet body 2. As a result, the airflow 22 passing under the helmet 1 can be increased, and thus the negative pressure formed on the first outer surface 13b and the second outer surface 14a, which are negative pressure forming surfaces, becomes larger. Therefore, by providing the chin spoiler 30, although the number of parts increases, the lift 25 applied to the helmet 1 can be further reduced.

[0049] The example shown depicts a structure where the rear end of the first outer surface 13b is positioned in front of the position where the cap body 2 reaches its maximum left-right width D3. However, this is not the only possible configuration. For instance, the rear end of the first outer surface 13b could also be positioned behind the position where the cap body 2 reaches its maximum left-right width D3. Alternatively, the rear end of the first outer surface 13b could be positioned at the same location as the position where the cap body 2 reaches its maximum left-right width D3. Even with such a structure, although the drag force 27 increases, the lift force 25 can be reduced.

[0050] • An example is shown where the first outer surface 13b is a sloped surface with a gradient continuous with that of the outer surface 2s, but it is not limited thereto. For example, the first outer surface 13b could also be a surface with the same curvature as the outer surface 2s. Even with such a structure, the airflow 24 can be guided downwards along the first outer surface 13b onto the helmet 1.

[0051] An example is shown where the lower end of the first outer surface 13b extends towards the center below the wearing opening 6, closer than the lower end of the second outer surface 14a. However, this is not the only example; for instance, the lower end of the second outer surface 14a could also extend towards the center of the wearing opening 6, closer than the lower end of the first outer surface 13b. In this case, although the negative pressure forming surface becomes smaller, the opening of the wearing opening 6 becomes larger, making it easier to wear the helmet 1.

[0052] • The helmet 1 can also be equipped with a chin guard that covers the wearer's chin. By providing the chin guard, the front part of the wearing opening 6 is covered. This prevents airflow from entering the interior of the helmet body 2 while the motorcycle or other vehicle is in motion.

[0053] • The example shows a full-face helmet structure, but it is not limited to this. For example, it could also be a lift-up helmet with a chin that can be raised, an open helmet, a helmet with a detachable chin, or a movable helmet that can be fixed to the back of the head by rotating the chin.

Claims

1. A full-face helmet comprising a helmet body and a pair of cheek pads disposed on the inner side of the helmet body. Each cheek pad includes: The first bottom portion has a first outer surface located below the lower edge of the helmet body when the helmet is worn by the wearer; and The second bottom portion has a second outer surface located behind the first bottom portion when the helmet is worn by the wearer. The first outer surface and the second outer surface constitute the wearing opening of the helmet, and the first outer surface is positioned below the second outer surface to form a negative pressure forming surface that generates downward pressure on the helmet. The first bottom and the second bottom have elasticity that allows the wearing opening to expand when subjected to a force that expands it, and to shrink when the force is removed. The first outer surface is configured such that its lower end protrudes further from the lower edge of the helmet towards the center below the wearing opening than the lower end of the second outer surface, thereby allowing the first bottom to smoothly fill the lateral step formed between the wearer's head and the helmet when viewed from the front of the helmet. The first outer surface has a rear end that is located at the front, where the width is greater than that of the cap body.

2. The full-face helmet according to claim 1, wherein, The first outer surface is configured to have a slope that is continuous with the curvature of the outer surface of the cap.

3. The full-face helmet according to claim 1 or 2, wherein, The helmet further includes a chin spoiler, which is mounted on the front of the lower edge of the helmet body.

4. A cheek pad disposed on the inside of the helmet body of a full-face helmet, comprising: The first bottom portion has a first outer surface located below the lower edge of the helmet body when the helmet is worn by the wearer; and The second bottom portion has a second outer surface that is positioned rearward than the first bottom portion when the helmet is worn by the wearer. The first outer surface and the second outer surface constitute the wearing opening of the helmet, and the first outer surface is positioned below the second outer surface to form a negative pressure forming surface that generates downward pressure on the helmet. The first bottom and the second bottom have elasticity that allows the wearing opening to expand when subjected to a force that expands it, and to shrink when the force is removed. The first outer surface is configured such that its lower end protrudes further from the lower edge of the helmet towards the center below the wearing opening than the lower end of the second outer surface, thereby allowing the first bottom to smoothly fill the lateral step formed between the wearer's head and the helmet when viewed from the front of the helmet. The first outer surface has a rear end that is located at the front, where the width is greater than that of the cap body.

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