Vehicle front portion structure

1. A vehicle front portion structure comprising:

a cowl having an outside air introduction duct introducing air into a cabin of a vehicle; and

a cowl louver exposed to a top of the vehicle and covering the cowl from an upper side of the vehicle, the cowl louver having a ventilation hole communicating with an outside of the vehicle, wherein:

the cowl louver includes an outer plate portion extending in a width direction of the vehicle and an inner plate portion disposed below the outer plate portion and covering the outside air introduction duct from the upper side of the vehicle;

an intake space formed between the outer plate portion and the inner plate portion forms a part of an outside air introduction path allowing the ventilation hole and the outside air introduction duct to communicate with each other;

an outside rib protruding from the outer plate portion toward the inner plate portion and extending in the width direction of the vehicle and an inside rib protruding from the inner plate portion toward the outer plate portion and extending in the width direction of the vehicle are disposed in the intake space; and

a virtual straight line passing through a front end portion of the intake space on a front side of the vehicle and a rear end portion of the intake space on a rear side of the vehicle intersects with at least one of the outside rib and the inside rib.

2. The vehicle front portion structure according to claim 1 , wherein:

a tip of the outside rib is spaced apart from the inner plate portion; and

a tip of the inside rib is spaced apart from the outer plate portion.

3. The vehicle front portion structure according to claim 1 , wherein:

the outside rib includes at least a first outside rib and a second outside rib disposed behind the first outside rib in a vehicle front-rear direction;

the inside rib includes at least a first inside rib and a second inside rib disposed behind the first inside rib in the vehicle front-rear direction; and

the virtual straight line intersects with at least two of the first outside rib, the second outside rib, the first inside rib, and the second inside rib.

4. The vehicle front portion structure according to claim 3 , wherein:

a tip of the first inside rib is closer to the top of the vehicle than a tip of the second outside rib; and

a tip of the second outside rib is closer to a bottom of the vehicle than a tip of the first inside rib.

5. The vehicle front portion structure according to claim 1 , wherein:

the cowl louver is provided with a constricted portion where the intake space is constricted by the outer plate portion and the inner plate portion approaching each other; and

a tip of the outside rib and a tip of the inside rib are positioned in the constricted portion.

6. The vehicle front portion structure according to claim 5 , wherein:

the inner plate portion has a bulging portion which bulges from the inner plate portion toward the outer plate portion and which is disposed in the constricted portion; and

the outside rib protrudes from the outer plate portion toward an end portion of a top surface of the bulging portion on the front side of the vehicle.

7. The vehicle front portion structure according to claim 1 , wherein a plurality of the outside ribs and a plurality of the inside ribs are disposed side by side in a front-rear direction of the vehicle and the outside ribs and the inside ribs are alternately disposed.

8. The vehicle front portion structure according to claim 1 , wherein:

the outside rib extends toward a rear of the vehicle;

the inside rib extends toward a front of the vehicle; and

the outside rib and the inside rib are inclined such that a part of each of the outside rib and the inside rib on a lower side of the vehicle is closer to the rear of the vehicle than a part of each of the outside rib and the inside rib on the upper side of the vehicle.

9. The vehicle front portion structure according to claim 1 , wherein an end edge of the inner plate portion on the rear side of the vehicle is bent toward the upper side of the vehicle.

10. The vehicle front portion structure according to claim 1 , wherein:

the cowl louver is provided with a ridge portion raised to the top of the vehicle; and

the ridge portion has a front wall having a front surface oriented to a front of the vehicle and an upper wall having an upper surface oriented to the top of the vehicle and the front wall has the ventilation hole.