Fluid handling – Control by change of position or inertia of system – With second control
Reexamination Certificate
1999-10-18
2001-06-26
Rivell, John (Department: 3753)
Fluid handling
Control by change of position or inertia of system
With second control
C137S038000, C137S043000
Reexamination Certificate
active
06250325
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a roll over valve for vehicles adapted for use in an evaporative gas control apparatus for vehicles.
2. Description of the Invention
Generally, a vehicle fuel supply apparatus is so constructed as to supply an appropriate quantity of fuel from a fuel tank, and the apparatus is provided with an evaporative gas control device for reuse of evaporative gas generated from the fuel tank.
The evaporative gas control device includes, as illustrated in
FIG. 4
, a fuel tank
51
having an inherent fuel pump
50
, a roll over valve
53
disposed on the fuel tank
51
and connected to a canister
52
, and a fuzzy control valve
54
arranged between the canister
52
and a suction manifold (M).
In other words, when evaporative gas is formed in the fuel tank
51
to reach a predetermined pressure and beyond, the roll over valve
53
is made to open to allow the gas to be infused into the canister
52
, and the gas passes the charcoal granules thereat, where gasoline is collected and only air is discharged into the atmosphere. The gasoline collected in the canister
52
is infused into the suction manifold (M) to thereafter be re-burnt when the fuzzy control valve
54
is opened by negative pressure of the suction manifold (M). At this time, the roll over valve
53
serves to control the evaporative gas and prevent leakage of fuel and gas when a vehicle is tilted and over-turned.
The roll over valve
53
includes, as illustrated in
FIG. 5
, a housing
57
disposed on the fuel tank
51
and formed with a connector
56
for forming a hole
55
thereunder and for connecting the canister
52
thereon, a float
58
inserted into an inner bottom surface of the housing
57
, a stopper
59
fixed to be positioned at an upper area of the float
58
, a valve body
61
fixed by disposed on the housing
57
and formed with a plurality of through holes
60
, a lifting member
63
liftably disposed in the stopper
59
and supported by a spring
62
for interdicting the valve body
61
when ascended by the float
58
and for opening the valve body
61
when descended by the float
58
, a ball
64
provided on the valve body
61
, and a rod
65
with one end of which contacting the ball
64
and the other end of which being supported by the lifting member
63
to thereby lift the ball
64
.
Now, operation of the roll over valve will be described. When an inner pressure of the fuel tank
51
is low or when fuel level is low, the float
58
is positioned at the bottom surface of the housing
57
and the ball
64
descends the rod
65
to cause the lifting member
63
to detach from the valve body
61
.
Of course, the lifting member
63
goes down because the weight of the ball
64
is greater than resilience of the spring
62
. When the valve body
61
and the lifting member
63
are detached, gas is smoothly allowed to pass the through holes
60
at the valve body
63
and thereafter collected in the canister
52
.
Under this circumstance, when the fuel level is raised because fuel is filled up or a vehicle is overturned, the float
58
is raised along the surface of the fuel to thereby cause an upper surface of the float
58
to ascend the lifting member
63
. When the lifting member
63
is raised, the rod
65
passes the valve body
61
and rises up to push out the ball
64
. In other words, the ball
64
is pushed out to cause the upper surface of the lifting member
63
to interdict the valve body
61
, such that fuel or gas is prevented from being leaked out or into the canister
52
.
SUMMARY OF THE INVENTION
However, there is ah problem in that, when gas or fuel is prevented from leaking by activating a float suddenly rising along the surface of the fuel, the fuel is abruptly infused into the fuel tank during filling-up of the fuel to thereby cause the float to interdict the valve body due to undulation at the surface of the fuel in a state where the fuel is not accurately poured in, such that it is very difficult to infuse the fuel accurately.
Furthermore, there is another problem in that the roll over valve is very complicated in its construction to thereby make it difficult to manufacture, and there are so many moving parts such as float, lift member, spring, rod, ball and the like to thereby incur lots of operational deficiency.
The present invention is disclosed to solve the aforementioned problems and it is an object of the present invention to provide a roll over valve for vehicles constructed to simplify the structure thereof and to enable an accurate fuel fill-up.
In accordance with the object of the present invention, there is provided a roll over valve for vehicles, the roll over valve comprising:
a hollow housing fixed at an upper end of a fuel tank and formed with a service pipe in order to cut off fuel gas;
an outlet pipe fixedly disposed on the housing for connection to the housing and for connection again to a canister;
a ball case for being liftably mounted in the housing and for fuel and gas to pass therethrough and for being disposed with the outlet pipe arranged therethrough;
a circular moving part for being formed at a bottom surface of the ball case to hold a ball therein;
a sealing pad disposed on the moving part to shield the outlet pipe when the ball case is lifted; and
a tensile spring provided between the ball case and the housing to apply an upward resilience to the ball case.
REFERENCES:
patent: 4095609 (1978-06-01), Martin
patent: 4742840 (1988-05-01), Takahashi et al.
patent: 4756328 (1988-07-01), Sherwood
Christie Parker & Hale LLP
Hyundai Motor Company
Krishnamurthy Ramesh
Rivell John
LandOfFree
Roll over valve for vehicles does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Roll over valve for vehicles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Roll over valve for vehicles will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2486243