Patent Description:
A straddle-type vehicle such as a motorcycle is known in which an optical axis adjustment hole (aiming hole) of a headlamp is formed in a front cowling (for example, see <CIT>). An optical axis adjustment device of the headlamp is installed inside the front cowling described in <CIT>, and a pair of optical axis adjustment holes accessible to the optical axis adjustment device are opened on both side surfaces of the front cowling. A tip end of a driver is inserted from each optical axis adjustment hole of the front cowling, and each of adjustment screws for front-rear adjustment and left-right adjustment of the optical axis adjustment device is rotated by the driver, so that an optical axis of the headlamp is adjusted in upper-lower and left-right directions.

The straddle-type vehicle described in <CIT> is designed to have a high front end portion of the front cowling, in order to reduce traveling wind that blows against an occupant. Therefore, when the traveling wind enters below the front cowling, an upward force is generated in a vehicle front portion, and a load shared by a front wheel may be decreased. In order to reduce a decrease in the load shared by the front wheel, it is necessary to make a front portion of the front cowling into a slant shape so that the front cowling can be pressed downward by the traveling wind, which reduces a degree of freedom in design.

Prior art document <CIT> discloses the features of the preamble of claim <NUM>.

Aspect of non-limiting embodiments of the present disclosure relates to provide a cowling structure that can achieve stable traveling without reducing the degree of freedom in design.

Aspects of certain non-limiting embodiments of the present disclosure address the features discussed above and/or other features not described above. However, aspects of the non-limiting embodiments are not required to address the above features, and aspects of the non-limiting embodiments of the present disclosure may not address features described above.

According to an aspect of the present disclosure, there is provided a cowling structure for a straddle-type vehicle, the cowling structure including:.

In a straddle-type vehicle according to one aspect of the present disclosure, a vehicle front portion is covered with a front cowling from a front side, and a lamp unit is installed inside the front cowling. A lower surface of the front cowling is inclined obliquely downward to a rear side, and the lower surface is formed with a ventilation hole through which traveling wind blows. Due to the ventilation hole, a lift force received by the lower surface of the front cowling from the traveling wind is reduced, and an upward force is less likely to be generated in the vehicle front portion. By increasing the load shared by the front wheel, it is possible to improve ground contact property of the front wheel and achieve stable traveling. It is not necessary to make the front portion of the front cowling into a slant shape, and the degree of freedom in design of the front cowling is not reduced. The lamp unit includes a lamp configured to illuminate a front of a vehicle, and an optical axis adjustment portion configured to adjust an optical axis of the lamp. The optical axis adjustment portion is configured to receive an operation with a tool through the ventilation hole, and the ventilation hole also serves as the optical axis adjustment hole of the upper headlamp, so that it is not necessary to provide extra holes in the front cowling.

Hereinafter, a cowling structure according to the present embodiment will be described with reference to the accompanying drawings. <FIG> is a right side view of a vehicle front portion of the present embodiment. <FIG> is a front view of the vehicle front portion of the present embodiment. In the following drawings, an arrow FR indicates a vehicle front side, an arrow RE indicates a vehicle rear side, an arrow L indicates a vehicle left side, and an arrow R indicates a vehicle right side.

As shown in <FIG>, a front cowling <NUM> and a pair of side cowlings <NUM> are provided at the vehicle front portion of a straddle-type vehicle <NUM>. The vehicle front portion is covered by the front cowling <NUM> from a front side, and the vehicle front portion is covered by the pair of side cowlings <NUM> from lateral sides. A front fork <NUM> protrudes toward a lower side from the side cowling <NUM>, and a front wheel <NUM> is rotatably supported at a lower portion of the front fork <NUM>. A main frame <NUM> protrudes toward a rear side from the side cowling <NUM>, a fuel tank <NUM> is provided on an upper side of the main frame <NUM>, and an engine <NUM> is provided on the lower side of the main frame <NUM>.

A front end side of the front cowling <NUM> is formed into a beak shape in a side view. A front surface of the front cowling <NUM> is inclined obliquely rearward and upward from a front end, and a windscreen <NUM> for wind protection is attached to the upper side of the front surface of the front cowling <NUM>. A lower surface of the front cowling <NUM> is formed in two upper and lower stages, and the lower surface on the rear side is one step lower than the lower surface on the front side of the front cowling <NUM>. A meter cover <NUM> is attached to the rear side of the front cowling <NUM>. A headlamp unit (lamp unit) <NUM> including an upper headlamp (upper lamp) <NUM> and a lower headlamp (lower lamp) <NUM> is located inside the front cowling <NUM>.

The pair of side cowlings <NUM> extends toward the rear side from the front cowling <NUM> to the front side of the fuel tank <NUM>, and extends toward the lower side from the front cowling <NUM> to the rear side of the front wheel <NUM>. Similarly to the front end side of the front cowling <NUM>, a front end side of each side cowling <NUM> (outer middle cowling <NUM>) is also formed into a beak shape in side view. The upper side of a front edge of each side cowling <NUM> is inclined obliquely upward and rearward from a front end, and the lower side of the front edge of each side cowling <NUM> is inclined obliquely downward and rearward from the front end. The pair of side cowlings <NUM> are connected to the rear side of the front cowling <NUM>, and a streamline shape that reduces air resistance from traveling wind is formed at the vehicle front portion of the straddle-type vehicle <NUM>.

As shown in <FIG> and <FIG>, the center of the front surface of the front cowling <NUM> is formed by a front center cowling <NUM>, and both left and right sides of the front surface of the front cowling <NUM> are formed by a pair of front side cowlings <NUM>. The upper side of the front surface of the front cowling <NUM> is formed by a front upper cowling <NUM>, and the lower side of the front surface of the front cowling <NUM> is formed by a front lower cowling <NUM>. A lens surface <NUM> of the upper headlamp <NUM> is exposed to the front side through an opening of the front center cowling <NUM>. A lens surface <NUM> of the lower headlamp <NUM> is exposed to the front side through an opening of the front lower cowling <NUM>.

An outer surface of each of the pair of side cowlings <NUM> is formed by an outer cowlings <NUM>, and an inner surface of each of the pair of side cowlings <NUM> is formed by an inner cowlings <NUM>. The outer cowling <NUM> is formed by combining an outer upper cowling <NUM>, an outer lower cowling <NUM>, and an outer middle cowling <NUM>. A turn signal lamp <NUM> protrudes laterally from the outer upper cowling <NUM>. The outer cowling <NUM> and the inner cowling <NUM> are overlapped in a left-right direction to form each side cowling <NUM> hollow. A space for accommodating electrical components is secured inside each side cowling <NUM>.

In the straddle-type vehicle <NUM> described above, the front end of the front cowling <NUM> is positioned high, in order to protect the occupant from traveling wind. When the traveling wind enters below the front cowling <NUM>, an upward force is easily generated in the vehicle front portion. If the upward force is applied at a location away from the center of gravity of the vehicle, a load shared by the front wheel is significantly decreased, which may result in unstable behavior when driving at high speeds. In this case, a structure is effective in which a hole is provided at a position where the front cowling <NUM> receives the traveling wind, thereby allowing the traveling wind to escape to the inside of the front cowling <NUM> to reduce the upward force applied to the vehicle front portion.

On the other hand, a hole for adjusting an optical axis of a lamp is also required in the front cowling <NUM>, but if the hole through which the traveling wind escapes and the hole for adjusting the optical axis are separately formed in the front cowling <NUM>, the number of holes in the front cowling <NUM> is increased, and the appearance is deteriorated. In order to reduce the upward force without providing a hole in the front cowling <NUM>, it is necessary to make the tip end of the front cowling <NUM> into a slant shape, but this reduces a degree of freedom in design. Therefore, in the present embodiment, a ventilation hole <NUM> is formed in the lower surface of the front cowling <NUM> against which the traveling wind blows, so that the upward force of the vehicle front portion is reduced and the optical axis of the lamp can be adjusted from the ventilation hole <NUM>.

The cowling structure will be described with reference to <FIG>. <FIG> is a perspective view of the vehicle front portion of the embodiment as viewed obliquely from the lower right. <FIG> is a bottom view of the vehicle front portion of the embodiment. <FIG> is a cross-sectional view of the vehicle front portion in <FIG> taken along a line V-V.

As shown in <FIG> and <FIG>, the lens surface <NUM> of the upper headlamp <NUM> and the lens surface <NUM> of the lower headlamp <NUM> are arranged, along up-down direction, on the front surface of the front cowling <NUM>. The lens surface <NUM> of the upper headlamp <NUM> is exposed to the front side through an opening <NUM> of the front center cowling <NUM>. The lens surface <NUM> of the lower headlamp <NUM> is exposed to the front side through an opening <NUM> of the front lower cowling <NUM>. A lower surface <NUM> on a lower stage side of the front lower cowling <NUM> is located on the rear side of a lower surface <NUM> on an upper stage side. The lens surface <NUM> of the lower headlamp <NUM> is located on the rear side of the lens surface <NUM> of the upper headlamp <NUM>.

The lower surface <NUM> on the upper stage side of the front lower cowling <NUM> is inclined obliquely downward to the rear side (see <FIG>). A pair of ventilation holes <NUM> are formed in the lower surface <NUM> on the upper stage side on outer sides, in a vehicle width direction, of the lower headlamp <NUM>. Even if the lower surface <NUM> on the upper stage side is inclined obliquely downward to the rear side, an upward force is less likely to be generated in the vehicle front portion, since the traveling wind can blow to the rear side through the pair of ventilation holes <NUM>. A protruding portion <NUM> protrudes downward from the rear side of each of the pair of ventilation holes <NUM>, and the traveling wind easily enters the pair of ventilation holes <NUM> by the protruding portions <NUM>. The pair of ventilation holes <NUM> also function as optical axis adjustment holes into which a tool such as a screwdriver is inserted in order to adjust an optical axis of the upper headlamp <NUM>.

A step surface <NUM> is formed between the lower surface <NUM> on the upper stage side and the lower surface <NUM> on the lower stage side of the front lower cowling <NUM>, and the lens surface <NUM> of the lower headlamp <NUM> is located at the center of the step surface <NUM>. Both sides of the step surface <NUM> in the vehicle width direction are recessed toward the rear side across the lens surface <NUM>. A pair of ventilation holes (other ventilation holes) <NUM> are formed on a back surface of the recess of the step surface <NUM>. The pair of ventilation holes <NUM> are located on the rear side of the pair of ventilation holes <NUM>. Even if traveling wind enters the recess of the step surface <NUM> of the front lower cowling <NUM>, an upward force is less likely to be generated in the vehicle front portion, since the traveling wind can blow to the rear side through the pair of ventilation holes <NUM>.

Further, the pair of ventilation holes <NUM> and the pair of ventilation holes <NUM> are located on the rear side of the lens surface <NUM> of the lower headlamp <NUM>. A side cover <NUM> is formed on the step surface <NUM> of the front lower cowling <NUM> to cover the lower headlamp <NUM> from a lateral side. The side cover <NUM> is inclined such that the side cover <NUM> expands from the lens surface <NUM> toward the pair of ventilation holes <NUM> and the pair of ventilation holes <NUM> and expands to the outer side in the vehicle width direction. The side cover <NUM> is configured to guide the traveling wind toward the pair of ventilation holes <NUM> and the pair of ventilation holes <NUM>, and the traveling wind easily flows into the pair of ventilation holes <NUM> and the pair of ventilation holes <NUM>. A lift force that the front lower cowling <NUM> receives from the traveling wind is reduced, and an upward force is less likely to be generated in the vehicle front portion.

As shown in <FIG> and <FIG>, in a bottom view, a part of the lower surface <NUM> on the lower stage side of the front lower cowling <NUM> overlaps the pair of ventilation holes <NUM>. Thus, foreign matters such as sand bounced up due to the front wheel <NUM> hardly enter the pair of ventilation holes <NUM>. Further, a front edge <NUM> of the lower surface <NUM> on the lower stage side expands rearward to the outer side in the vehicle width direction from the center in the vehicle width direction. An inner side, in the vehicle width direction, of the front edge <NUM> is located on the front side of the pair of ventilation holes <NUM>. An outer side, in the vehicle width direction, of the front edge <NUM> is located on the rear side of the pair of ventilation holes <NUM>. The traveling wind is rectified by the lower surface <NUM> on the lower stage side, and the pair of ventilation holes <NUM> can be easily seen from diagonally below, which improves workability of optical axis adjustment work to be described later.

The lower surface <NUM> on the lower stage side of the front lower cowling <NUM> is cut out to expose an entire lower surface <NUM> of the headlamp unit <NUM>, and the entire lower surface <NUM> of the headlamp unit <NUM> fits into a cutout <NUM> of the lower surface <NUM> on the lower stage side. The lower side of the headlamp unit <NUM> is not covered by the front lower cowling <NUM>, and the lower surface <NUM> of the headlamp unit <NUM> is exposed to the lower side, thereby improving heat dissipation. At the front end side of the front cowling <NUM>, the headlamp unit <NUM>, which is a heavy object, fits into the cutout <NUM> of the front lower cowling <NUM>, thereby lowering the center of gravity at the vehicle front portion and improving driving stability.

The opening <NUM> of the front lower cowling <NUM> is continuous with the cutout <NUM>, and the lens surface <NUM> of the lower headlamp <NUM> is located low. The front lower cowling <NUM> is formed with a crossing portion <NUM> crossing the opening <NUM> along a lower edge of the lens surface <NUM> of the lower headlamp <NUM>. The crossing portion <NUM> is located on the rear side of an opening edge of the front lower cowling <NUM>. The crossing portion <NUM> hides a step between the lens surface <NUM> of the headlamp unit <NUM> and a lamp housing <NUM> or an interface between components, thereby improving appearance (see <FIG>). Further, a lower side of the opening <NUM> of the front lower cowling <NUM> is connected to the crossing portion <NUM> to increase the rigidity.

The cutout <NUM> of the front lower cowling <NUM> is formed to be wider from the front side toward the rear side, and the cutout <NUM> is the narrowest when viewed from the front side/ Thus, exposure of a lower end of the headlamp unit <NUM> is reduced to the minimum (see <FIG>). A pair of fixing portions <NUM> are provided at both side edges, in the vehicle width direction, of the cutout <NUM> of the front lower cowling <NUM>. The headlamp unit <NUM> is fixed to the pair of fixing portions <NUM>, and both side edges, in the vehicle width direction, of the cutout <NUM> of the front lower cowling <NUM> are connected via the headlamp unit <NUM>. The headlamp unit <NUM> functions as a bridge, and the rigidity of the cutout lower surface <NUM> of the front lower cowling <NUM> is increased.

In the headlamp unit <NUM> shown in <FIG>, a lower half portion protrudes to the rear side than an upper half portion of the lamp housing <NUM>. On a back surface of the upper half portion of the lamp housing <NUM>, an upper optical axis adjustment portion 41a is provided near an upper right corner, and an upper optical axis adjustment portion 41b is provided near the center on the left side. On a back surface of the lower half portion of the lamp housing <NUM>, a lower optical axis adjustment portion 42a is provided near a lower right corner, and a lower optical axis adjustment portion 42b is provided near the center on the left side. The optical axis of the upper headlamp <NUM> is adjusted in the upper-lower and left-right directions by the upper optical axis adjustment portions 41a and 41b. An optical axis of the lower headlamp <NUM> is adjusted in the upper-lower and left-right directions by the lower optical axis adjustment portions 42a and 42b.

The upper optical axis adjustment portions 41a and 41b is configured to receive an operation with a tool (not shown) through the pair of ventilation holes <NUM>, and the lower optical axis adjustment portions 42a and 42b is configured to receive an operation with a tool through the cutout <NUM>. Upper tool guides 43a and 43b are provided around the upper optical axis adjustment portions 41a and 41b. The upper tool guides 43a and 43b restrict an insertion direction of the tools onto tool lines L1 and L2 connecting the pair of ventilation holes <NUM> and the upper optical axis adjustment portions 41a and 41b. Lower tool guides 44a and 44b are provided around the lower optical axis adjustment portions 42a and 42b, and the lower tool guides 44a and 44b restrict the insertion direction of the tools onto the tool lines L3 and L4 connecting the cutout <NUM> and the lower optical axis adjustment portions 42a and 42b.

In a case where the tool is inserted from the pair of ventilation holes <NUM>, a tip end of the tool is guided to the upper optical axis adjustment portions 41a and 41b by the upper tool guides 43a and 43b. In a case where the tool is inserted from the cutout <NUM>, a tip end of the tool is guided to the lower optical axis adjustment portions 42a and 42b by the lower tool guides 44a and 44b. This facilitates the optical axis adjustment work of the upper headlamp <NUM> and the lower headlamp <NUM>. The pair of ventilation holes <NUM> serve as optical axis adjustment holes of the upper optical axis adjustment portions 41a and 41b, and the cutouts <NUM> serve as optical axis adjustment holes of the lower optical axis adjustment portions 42a and 42b. Therefore, there is no need to add an optical axis adjustment hole to the front cowling <NUM>, and the appearance of the straddle-type vehicle <NUM> is improved.

A common cowlings is manufactured by injection molding, in which a mold is filled with a molten resin. The mold is formed with a protruding portion that corresponds to a hole shape of the cowling. When the mold is filled with a molten resin, the molten resin branches to avoid the protruding portion, and the molten resin that has gone around the protruding portion joins together and forms a weld line. For this reason, as the number of holes in the cowling increases, many weld lines appear on the appearance of the unpainted cowling. Since the number of holes of the front lower cowling <NUM> of the present embodiment is reduced to the minimum, the number of weld lines of the front lower cowling <NUM> is reduced, so that the appearance of the straddle-type vehicle <NUM> is improved.

A flow of traveling wind in the front cowling will be described with reference to <FIG> is a view showing the flow of traveling wind in a cross section of the vehicle front portion in <FIG> taken along a line VI-VI.

As shown in <FIG>, the lower headlamp <NUM> is accommodated in the center of the front lower cowling <NUM>. On both sides of the lower headlamp <NUM>, the pair of ventilation holes <NUM> are formed in the lower surface <NUM> on the upper stage side of the front lower cowling <NUM>. Further, the front lower cowling <NUM> is recessed on the rear side of the pair of ventilation holes <NUM>, and the pair of ventilation holes <NUM> are formed on a back surface of the recess of the front lower cowling <NUM>. When the vehicle is traveling, traveling wind enters below the front cowling <NUM>, and the traveling wind flows to the rear side along the lens surface <NUM> of the lower headlamp <NUM> and the side cover <NUM>.

The traveling wind enters the inside of the front lower cowling <NUM> from the pair of ventilation holes <NUM>, and the traveling wind enters the inside of the front lower cowling <NUM> from the pair of ventilation holes <NUM>. Since the traveling wind blows to the inside of the front lower cowling <NUM> from the pair of ventilation holes <NUM> and the pair of ventilation holes <NUM>, a lift force on the lower surface <NUM> on the upper stage side of the front lower cowling <NUM> decreases, and an upward force is less likely to be generated at the vehicle front portion. The traveling wind flows to the rear side through both lateral sides of the headlamp unit <NUM>, so that the traveling wind is less likely to flow around to a back surface side of the headlamp unit <NUM>, and electrical components on the back surface side of the headlamp unit <NUM> are protected from foreign matters and the like carried by the traveling wind.

The optical axis adjustment work of the upper headlamp and the lower headlamp will be described with reference to <FIG> and <FIG>. <FIG> is a perspective view of the vehicle front portion of the embodiment as viewed obliquely from the lower right. <FIG> is a perspective view of the vehicle front portion of the embodiment as viewed obliquely from the lower left.

As shown in <FIG>, the ventilation hole <NUM> on the right side is covered from the lateral side by the side cowling <NUM>, and the ventilation hole <NUM> is exposed obliquely downward to the right side from the side cowling <NUM>. Since the ventilation hole <NUM> on the right side is hidden by the side cowling <NUM> when viewed from the lateral side, the appearance of the straddle-type vehicle <NUM> is improved. Since the ventilation hole <NUM> on the right side can be seen from the obliquely lower right side, the tool can be inserted through the ventilation hole <NUM>. When the tool is inserted into the ventilation hole <NUM> on the right side from obliquely downward to the right, a tip end of the tool is guided by the upper tool guide 43a to the upper optical axis adjustment portion 41a. Even if the upper optical axis adjustment portion 41a is not visually observable, the upper optical axis adjustment portion 41a can be operated with the tool.

As shown in <FIG>, the ventilation hole <NUM> on the left side is covered from the lateral side by the side cowling <NUM>, and the ventilation hole <NUM> is exposed obliquely downward to the left side from the side cowling <NUM>. Since the ventilation hole <NUM> on the left side is hidden by the side cowling <NUM> when viewed from the lateral side, the appearance of the straddle-type vehicle <NUM> is improved. Since the ventilation hole <NUM> on the left side can be seen from the obliquely lower left side, the tool can be inserted through the ventilation hole <NUM>. When the tool is inserted into the ventilation hole <NUM> on the left side from obliquely downward to the left, a tip end of the tool is guided by the upper tool guide 43b to the upper optical axis adjustment portion 41b. Even if the upper optical axis adjustment portion 41b is not visually observable, the upper optical axis adjustment portion 41b can be operated with the tool.

As shown in <FIG> and <FIG>, the lower optical axis adjustment portions 42a and 42b are exposed to the lower side by the cutouts <NUM> of the front lower cowling <NUM>. In a case where the tool is brought close to the lower optical axis adjustment portions 42a and 42b from directly below through the cutouts <NUM> of the front lower cowling <NUM>, a tip end of the tool is guided to the lower optical axis adjustment portions 42a and 42b by the lower tool guides 44a and 44b (see <FIG>). Even if the lower optical axis adjustment portions 42a and 42b are not visually observable, the lower optical axis adjustment portion 42a and 42b can be operated with the tool. In this way, the optical axis adjustment of the upper headlamp <NUM> and the lower headlamp <NUM> are easily performed, and the maintainability is improved.

As described above, according to the cowling structure of the present embodiment, traveling wind easily blows through the pair of ventilation holes <NUM> of the front lower cowling <NUM>. Due to the pair of ventilation holes <NUM>, a lift force received by the lower surface <NUM> of the front lower cowling <NUM> from traveling wind is reduced, and an upward force is less likely to be generated in the vehicle front portion. By increasing the load shared by the front wheel, it is possible to improve ground contact property of the front wheel <NUM> and achieve stable traveling. It is not necessary to make the front portion of the front cowling <NUM> into a slant shape, and the degree of freedom in design of the front cowling <NUM> is not reduced. Further, since the pair of ventilation holes <NUM> also serve as the optical axis adjustment holes of the upper headlamp <NUM>, it is not necessary to provide extra holes in the front cowling <NUM>.

In the present embodiment, the front cowling is formed by combining a plurality of cowling members. Alternatively, the front cowling may be formed by one cowling member.

Further, in the present embodiment, the outer cowling is formed by combining a plurality of cowling members. Alternatively, the outer cowling may be formed by one cowling member.

Further, in the present embodiment, the lamp unit includes the upper headlamp and the lower headlamp. Alternatively, the lamp unit may be a single headlamp. Further, the lamp unit is a unit for a headlamp, and the lamp unit may be a unit other than a headlamp.

Further, in the present embodiment, the lower surface of the front cowling is formed in two upper and lower stages. Alternatively, the lower surface of the front cowling may not be formed in a stepped shape.

Further, in the present embodiment, the optical axis adjustment portion is operated with a tool through the pair of ventilation holes. Alternatively, the pair of ventilation holes may be used to install other members by using a tool. In this case, a member may be provided inside the front cowling, a fastening component such as a screw of the member may be exposed to the outside through the ventilation hole, and the fastening component of the member inside the front cowling may be fastened. For example, a sensor for radar support or the like may be provided inside the front cowling, and a fastening component for fixing the sensor through the ventilation hole may be fastened with a tool.

Further, in the present embodiment, the front cowling is formed by the front center cowling, the pair of front side cowlings, the front upper cowling, and the front lower cowling. Alternatively, the front cowling may be formed by six or more cowlings.

Further, the cowling structure according to the present embodiment is not limited to the above-described straddle-type vehicle, and may be used in other types of straddle-type vehicles. The straddle-type vehicle is not limited to a general vehicle in which a driver rides on a seat in a posture of straddling the seat, and includes a scooter-type vehicle in which the driver rides on the seat without straddling the seat.

As described above, a first aspect relates to a cowling structure for a straddle-type vehicle (<NUM>), the cowling structure including: a front cowling (<NUM>) covering a vehicle front portion from a front side, in which a lamp unit (headlamp unit <NUM>) is installed inside the front cowling, a lower surface (<NUM>) of the front cowling is inclined obliquely downward to a rear side, the lower surface is formed with a first ventilation hole (<NUM>) through which traveling wind blows, the lamp unit includes a lamp (upper headlamp <NUM>) configured to illuminate a front of a vehicle, and an optical axis adjustment portion (upper optical axis adjustment portion 41a, 41b) configured to adjust an optical axis of the lamp, and the optical axis adjustment portion is configured to receive an operation with a tool, through the first ventilation hole. According to this configuration, the traveling wind can easily blow through the ventilation hole in the lower surface of the front cowling. Due to the ventilation hole, a lift force received by the lower surface of the front cowling from the traveling wind is reduced, and an upward force is less likely to be generated in the vehicle front portion. By increasing the load shared by the front wheel, it is possible to improve ground contact property of the front wheel and achieve stable traveling. It is not necessary to make the front portion of the front cowling into a slant shape, and the degree of freedom in design of the front cowling is not reduced. Further, since the ventilation hole also serves as the optical axis adjustment hole of the upper headlamp, it is not necessary to provide extra holes in the front cowling.

A second aspect is directed to the first aspect, in which the lower surface of the front cowling is formed in two upper and lower stages, the lower surface (<NUM>) on an upper stage side of the front cowling is inclined obliquely downward to the rear side, the first ventilation hole through which traveling wind blows is formed in the lower surface on the upper stage side of the front cowling, the lamp unit includes an upper lamp (upper headlamp <NUM>) and a lower lamp (lower headlamp <NUM>), which are serving as the lamp, and an upper optical axis adjustment portion (41a, 41b) and a lower optical axis adjustment portion (42a, 42b), which are serving as the optical axis adjustment portion, the upper optical axis adjustment portion being configured to adjust optical axes of the upper lamp, the lower optical axis adjustment portion being configured to adjust optical axes of the lower lamp, and the first ventilation hole is formed in the lower surface on the upper stage side of the front cowling on an outer side in a vehicle width direction of the lower lamp, and the upper optical axis adjustment portion is configured to receive an operation with a tool, through the first ventilation hole. According to this configuration, the ventilation hole is brought close to the upper optical axis adjustment portion, so that workability of the optical axis adjustment work of the upper lamp is improved.

A third aspect is directed to the second aspect, in which the first ventilation hole is located behind a lens surface (<NUM>) of the lower lamp, a step surface (<NUM>) is formed between the lower surface on the upper stage side and the lower surface on a lower stage side of the front cowling, and the step surface is formed with a side cover (<NUM>) covering the lower lamp from a lateral side, and the side cover is inclined such that the side cover expands to the outer side in the vehicle width direction and expands from the lens surface toward the first ventilation hole. According to this configuration, the traveling wind is guided toward the ventilation hole by the side cover, and the traveling wind easily flows into the ventilation hole. A lift force that the front cowling receives from the traveling wind is reduced, and an upward force is less likely to be generated in the vehicle front portion. By increasing the load shared by the front wheel, it is possible to improve ground contact property of the front wheel and achieve stable traveling.

A fourth aspect is directed to the second aspect or the third aspect, in which, in a bottom view, a part of the lower surface on a lower stage side of the front cowling overlaps the first ventilation hole. According to this configuration, foreign matters bounced up due to the front wheel hardly enter the ventilation hole.

A fifth aspect is directed to the fourth aspect, in which a front edge (<NUM>) of the lower surface on the lower stage side of the front cowling expands rearward from a center in the vehicle width direction to the outer side in the vehicle width direction, an inner side, in the vehicle width direction, of the front edge is located in front of the first ventilation hole, and an outer side, in the vehicle width direction, of the front edge is located behind the first ventilation hole. According to this configuration, the traveling wind is rectified by the lower surface on the lower stage side of the front cowling, and the ventilation hole can be easily seen from diagonally below, which improves workability of the optical axis adjustment work of the upper lamp.

A sixth aspect is directed to any one of the second aspect to the fifth aspect, in which a second ventilation hole (<NUM>) is formed in a step surface between the lower surface on the upper stage side of the front cowling and the lower surface on a lower stage side of the front cowling. According to this configuration, due to the another ventilation hole, a lift force received by the lower surface of the front cowling from the traveling wind is reduced, and an upward force is less likely to be generated in the vehicle front portion. By increasing the load shared by the front wheel, it is possible to improve ground contact property of the front wheel and achieve stable traveling.

A seventh aspect is directed to any one of the second aspect to the sixth aspect, in which a pair of side cowlings (<NUM>) covering the vehicle front portion from lateral sides are provided, and the first ventilation hole is covered from a lateral side, by the side cowling, and the first ventilation hole is exposed, from the side cowling, obliquely downward on an outer side in a vehicle width direction. According to this configuration, the ventilation hole is hidden by the side cowling when viewed from the lateral side, so that the appearance of the straddle-type vehicle is improved. The workability of the optical axis adjustment is not deteriorated because the ventilation hole is visible from obliquely below on the outer side in the vehicle width direction.

Although the present embodiment has been described, as another embodiment, the above-described embodiment and modification may be combined entirely or partially.

Claim 1:
A cowling structure for a straddle-type vehicle (<NUM>), the cowling structure comprising:
a front cowling (<NUM>) covering a vehicle front portion from a front side,
wherein a lamp unit (<NUM>) is installed inside the front cowling (<NUM>),
wherein a lower surface (<NUM>) of the front cowling (<NUM>) is inclined obliquely downward to a rear side,
wherein the lamp unit (<NUM>) includes:
a lamp (<NUM>) configured to illuminate a front of a vehicle; and
an optical axis adjustment portion (41a, 41b) configured to adjust an optical axis of the lamp (<NUM>),
characterised in that the lower surface (<NUM>) is formed with a first ventilation hole (<NUM>) through which traveling wind blows, and
the optical axis adjustment portion (41a, 41b) is configured to receive an operation with a tool, through the first ventilation hole (<NUM>).