CN201041112Y

CN201041112Y - Oil tank cover for preventing volatility of fuel oil

Info

Publication number: CN201041112Y
Application number: CNU200720124046XU
Authority: CN
Inventors: 王金玲; 高长建; 潘联
Original assignee: Chongqing Zongshen Technology Development and Research Co Ltd
Current assignee: Chongqing Zongshen General Power Machine Co Ltd
Priority date: 2007-04-17
Filing date: 2007-04-17
Publication date: 2008-03-26
Anticipated expiration: 2017-04-17

Abstract

The utility model relates to a fuel volatilization controlling fuel tank cover which can avoid the volatilization of the fuel in the fuel tank. The fuel tank cover comprises a cover body with internal thread, an internal large cover fixed in the cover body, and a rubber bearing, a rubber cap, and an internal small cover which are fixed on the internal large cover, therefore, not only the outside air can enter into the fuel tank from the clearance between the fuel tank cover and the thread connected in rotary with the fuel inlet of the fuel tank, but also the volatilization of the fuel in the fuel tank from the clearance of the thread can be avoided.

Description

Anti-fuel oil benzine case lid

Technical field

The utility model relates to a kind of fuel tank cap that is used to seal the fuel tank filler opening, particularly a kind of anti-fuel oil benzine case lid that can prevent fuel oil volatilization in the fuel tank.

Background technique

The filler opening of general gasoline engines fuel tank must seal with fuel tank cap, to guarantee that fuel oil can not flow out from the fuel tank filler opening, simultaneously, to guarantee that also ambient air can enter in the fuel tank from filler opening, to eliminate the negative pressure that in fuel tank, produces owing to the consumption of fuel oil.

The mode that the filler opening of small utility gasoline engine fuel tank and fuel tank cap generally adopt screw thread to spin seals, so employed fuel tank cap has internal thread.This kind fuel tank cap is after sealing filler opening, gap between the screw thread that ambient air can be successfully spins from fuel tank cap and fuel tank filler opening enters in the fuel tank, but the fuel oil in the fuel tank is but pitched and can be vapored away from the gap between this screw thread, thereby causes the waste of fuel oil.

The model utility content

Technical problem to be solved in the utility model provides a kind of anti-fuel oil benzine case lid, gap between the screw thread that ambient air spins from fuel tank cap and fuel tank filler opening is entered in the fuel tank, the fuel oil in the fuel tank can not vapored away from the gap between this screw thread.

Anti-fuel oil benzine case lid described in the utility model comprises tapped lid, the lid inside top surface is provided with the cylinder that combines as a whole with lid, Nei Dagai is installed in lid, interior big lid is for having the cylindrical body of step, offer step through-hole along its axis, end face at its step place end offers circular groove, and offers the groove that this end face edge is communicated with circular groove and step through-hole, and the aperture of described step through-hole is positioned at big lid step place end; Be set with rubber pad interior covering greatly, its end face and interior big lid step end face are fitted, and the rubber pad outer peripheral surface is provided with at least two boss; Be installed with the rubber cap that the top offers otch in the aperture of interior big lid step through-hole, the end face and the lid inside top surface of interior big lid step place end are fitted, the cylinder of lid inside top surface is positioned at the circular groove of big lid, and has the space between cylinder end face and this circular groove bottom surface.

Adorn in the macropore of big lid step through-hole in described and be plugged with the interior tegillum that end face offers through hole, offer at least two grooves on the peripheral wall of interior tegillum, this groove is communicated with the opening end of interior tegillum.

After this fuel tank cap was tightened on the fuel tank filler opening, the filler opening end face compressed rubber pad, and the end face of big lid step place end is close to fuel tank lid inside top surface in making, thereby filler opening is implemented reliable sealing.

The boss that is provided with on the rubber pad outer peripheral surface can make rubber pad and cooperating of interior big lid have certain magnitude of interference, and the thread groove that is unlikely interior big lid blocks, thereby guarantee that ambient air enters passage unimpeded of fuel tank, also can guarantee simultaneously rubber pad and in big lid can from interior big lid, not drop out easily.

The dress plug interior tegillum in the macropore of Nei Dagai step through-hole can prevent that the rubber cap accident from falling in the fuel oil, in tegillum can be installed in reliably in the groove of offering on its peripheral wall can guarantee in the macropore of big lid step through-hole.

When the fuel oil in the fuel tank has used a certain amount of and makes in the fuel tank when producing negative pressure, gap between the screw thread that extraneous air spins from fuel tank cap and fuel tank filler opening enters, through the groove of interior big lid end face, circular groove to the rubber cap inner chamber, then the otch at rubber cap top is backed down and enter in the fuel tank, thereby make air pressure and extraneous balance in the fuel tank.

And be positioned at the gaseous fuel of fuel tank because pressure is little, the otch at rubber cap top can not be backed down, so gaseous fuel can not flow out in the gap between the screw thread that fuel tank cap and fuel tank filler opening spin in the fuel tank, so the interior fuel oil of fuel tank can not vapor away.

Description of drawings

Now in conjunction with the accompanying drawings the utility model is described in further detail.

Fig. 1 is the main pseudosection of anti-fuel oil benzine case lid described in the utility model;

Fig. 2 is the main pseudosection of lid;

Fig. 3 is the plan view of interior big lid;

Fig. 4 is the plan view of Fig. 3;

Fig. 5 is the plan view of rubber pad;

Fig. 6 is the plan view of rubber cap;

Fig. 7 is the sectional view of A-A line among Fig. 6;

Fig. 8 is the plan view of interior tegillum;

Fig. 9 is the plan view of Fig. 8.

Embodiment

Extremely shown in Figure 8 as Fig. 1, should comprise tapped lid 1 by anti-fuel oil benzine case lid, described lid 1 inside top surface is provided with the cylinder 6 that combines as a whole with lid, big lid 3 in lid 1, being equipped with, in big lid 3 for having the cylindrical body of step, offer step through-hole 7 along its axis, offer circular groove 8 at the end face of its step place end, and offering the groove 9 that this end face edge is communicated with circular groove 8 and step through-hole 7, the aperture of described step through-hole 7 is positioned at big lid 3 step place ends.Be set with rubber pad 2 on Nei Dagai 3, its end face and interior big lid 3 step end faces are fitted, and rubber pad 2 outer peripheral surfaces are provided with three boss 10; Be installed with the rubber cap 4 that the top offers otch 11 in the aperture of interior big lid step through-hole 7, under free state, this otch 11 is in closed state.Dress is plugged with the interior tegillum 5 that end face offers through hole 13 in the macropore of interior big lid step through-hole 7, offers eight grooves 12 on the peripheral wall of interior tegillum 5, and this groove 12 is communicated with the opening end of interior tegillum 5.The end face and lid 1 inside top surface of interior big lid 3 step place ends are fitted, and the cylinder 6 of lid 1 inside top surface is positioned at and covers 3 circular groove 8 greatly, and has the space between cylinder 6 end faces and this circular groove 8 bottom surfaces.

When air pressure in the fuel tank and extraneous balance, the otch 11 at rubber cap 4 tops is in closed state, flow out in gap between the screw thread that vaporous fuel oil in the fuel tank can not spin from fuel tank cap and fuel tank filler opening, thereby make the interior fuel oil of fuel tank can be not volatilized.When the fuel oil in the fuel tank has used a certain amount of and makes in the fuel tank when producing negative pressure, gap between the screw thread that extraneous air spins from fuel tank cap and fuel tank filler opening enters, through the groove 9 of interior big lid 3 end faces, circular groove 8 to rubber cap 4 inner chambers, the otch 11 at rubber cap 4 tops backed down enter in the fuel tank, thereby make air pressure and extraneous balance in the fuel tank.

Claims

1. anti-fuel oil benzine case lid, comprise tapped lid (1), it is characterized in that: described lid inside top surface is provided with the cylinder (6) that combines as a whole with lid, Nei Dagai (3) is installed in lid, interior big lid is for having the cylindrical body of step, offer step through-hole (7) along its axis, end face at its step place end offers circular groove (8), and offering the groove (9) that this end face edge is communicated with circular groove and step through-hole, the aperture of described step through-hole is positioned at big lid step place end; Be set with rubber pad (2) interior covering greatly, its end face and interior big lid step end face are fitted, and the rubber pad outer peripheral surface is provided with at least two boss (10); Be installed with the rubber cap (4) that the top offers otch (11) in the aperture of interior big lid step through-hole, the end face and the lid inside top surface of interior big lid step place end are fitted, the cylinder of lid inside top surface is positioned at the circular groove of big lid, and has the space between cylinder end face and this circular groove bottom surface.

2. anti-fuel oil benzine case lid according to claim 1 is characterized in that: adorns in the macropore of big lid step through-hole (7) in described and is plugged with the interior tegillum (5) that end face offers through hole (13),

3. anti-fuel oil benzine case lid according to claim 2 is characterized in that: offer at least two grooves (12) on the peripheral wall of tegillum (5) in described, this groove is communicated with the opening end of interior tegillum.