Mouthpiece assembly of a fuel tank for vehicles with tight closing device

1. Mouthpiece assembly of a fuel tank for vehicles comprising:

a box defining a recessed housing wherein a hole is obtained to access a duct leading to the fuel tank of the vehicle,

a lid hinged to the box in such manner to close the recessed housing of the box, said lid being provided with a closing seat,

a closing device disposed in the recessed housing of the box of the mouthpiece assembly, said closing device comprising:

a translating pin translatingly mounted in a box and having an upper portion that cooperates with the closing seat of the lid in such manner to hold the lid in closed position, and

a push-push lock mechanism connected to the translating pin;

a cap made of a soft elastic material disposed above said upper portion of the translating pin to provide tightness with the closing seat of the lid;

wherein said upper part of the translating pin comprises a plurality of longitudinal tabs that are elastically flexible outwards in such manner to deform said cap, forming a collar that protrudes outwards and is engaged tightly inside said seat of the lid of the fuel tank in order to hold the lid of the fuel tank in closed position.

2. The mouthpiece assembly of claim 1 , wherein said longitudinal tabs of the stem have a retention tooth that protrudes outwards and forms said collar of the cap when the longitudinal tabs are bent outwards.

3. The mouthpiece assembly of claim 1 , wherein said translating pin has an internally hollow tubular shape comprising an axial channel and is slidingly mounted on a shank fixed to said box of the closing device.

4. The mouthpiece assembly of claim 3 , wherein

said closing device comprises a stem that stands up from said shank of the box of the closing device and is disposed inside said axial channel of the translating pin, said stem having a tapered upper part, and

said longitudinal tabs of the translating pin have a tapered internal surface that cooperates with the tapered upper part of the stem in such manner to elastically bend outwards.

5. The mouthpiece assembly of claim 1 , wherein each longitudinal tab has an upper portion with a thickness higher than the lower portion.

6. The mouthpiece assembly of claim 2 , wherein

said shank of the box of the closing device and said axial channel of the translating pin are shaped in such way to prevent the translating pin from rotating with respect to the shank and/or

said closing device comprising a cover disposed on the box, said cover being provided with a hole from which said translating pin comes out, said hole of the cover and said translating pin being shaped in such way to prevent the translating pin from rotating with respect to the cover.

7. The mouthpiece assembly of claim 1 , wherein said cap comprises a bellows-shaped lower portion and a cylindrical upper portion.

8. The mouthpiece assembly of claim 1 , wherein said closing seat of the lid of the fuel tank is provided with a collar that protrudes inwards to cooperate with the collar that protrudes towards the outside of the cap.

9. The mouthpiece assembly of claim 1 , wherein said push-push lock mechanism comprises:

an ejection spring that pushes said translating pin,

a heart-shaped cam pivoted in said box, said heart-shaped cam being provided with tracks forming a substantially heart-shaped closed circuit, and

a rocker arm pivoted in said box with a pivoting axis orthogonal to the axis of the translating pin, said rocker arm being provided with a fork disposed at a first end of the rocker arm that engages with said pin and a follower disposed at a second end of the rocker arm that slides in the tracks of the heart-shaped cam.

10. The mouthpiece assembly of claim 1 , also comprising an actuator with an electrical motor that actuates a slide provided with a beak that engages in a slot of said translating pin to lock the translating pin.