Fluid-pressure and analogous brake systems – Multiple fluid-receiving devices – Multiple motors
Reexamination Certificate
2000-05-23
2001-08-14
Butler, Douglas C. (Department: 3613)
Fluid-pressure and analogous brake systems
Multiple fluid-receiving devices
Multiple motors
C188S195000, C188S349000, C303S009660, C303S009630, C303S022100, C303S022400, C303S022500
Reexamination Certificate
active
06273524
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a braking force control valve for an air brake system of an automotive vehicle, and more particularly, to a braking force control valve that can control braking force by controlling pressure of compressed air supplied to a brake chamber.
BACKGROUND OF THE INVENTION
Generally, an air brake system is designed to generate braking force by using the expansion force of compressed air, and it is generally used for trucks and buses which use an air suspension system.
In a conventional technology of the air brake, the compressed air used for generating braking force is supplied to a load sensing valve through an air bellows. Accordingly, when the air bellows is damaged such that it leaks air, the air pressure supplied to a brake chamber is reduced, deteriorating the braking force.
SUMMARY OF THE INVENTION
Therefore, the present invention has been made in an effort to solve the above problem.
It is an objective of the present invention to provide a braking force control valve for an air brake which can generate sufficient braking force even when an air bellows is damaged or a vehicle is overloaded.
To achieve the above objective, the present invention provides an air brake system for a vehicle comprising an air compressor for generating compressed air, an air tank for storing the compressed air supplied from the air compressor, an air bellows connected to the air tank, a load sensing valve connected to the air bellows to equilibrate braking force applied to front and rear wheels of the vehicle, a brake valve for operating the load sensing valve, a brake chamber for supplying braking force by receiving the compressed air from the air tank when the brake valve is operated, and a braking force control valve disposed between the load sensing valve and the air bellows to adjust air pressure supplied to the brake chamber.
The braking force control valve comprises: a valve body provided with a first port connected to the air tank, a second port connected to the air bellows, and a third port connected to the load sensing valve; and a valve mechanism for selectively connecting the third port to either the first port or the second port according to a height variation between a body and an axle shaft of the vehicle.
The valve mechanism comprises a piston rod slidably inserted into the valve body, a first valve for selectively connecting the second port to the third port according to a sliding motion of the piston rod, a second valve for selectively connecting the first and third portion according to the sliding motion of the piston rod, and a push rod connecting the piston rod to an axle shaft.
According to another aspect, the present invention provides a braking force control valve for an air brake system having an air compressor for generating compressed air, an air tank for storing the compressed air supplied from the air compressor, an air bellows connected to the air tank, a load sensing valve connected to the air bellows to equilibrate braking force applied to front and rear wheels of the vehicle, a brake valve for operating the load sensing valve, a brake chamber for supplying braking force by receiving the compressed air from the air tank when the brake valve is operated, the braking force control valve comprising a valve body provided with a first port connected to the air tank, a second port connected to the air bellows, a third port connected to the load sensing valve, and a valve mechanism for selectively connecting the third port to either the first port or the second port according to a height variation between a body and an axle shaft of the vehicle.
REFERENCES:
patent: 3159433 (1964-12-01), Clevreux et al.
patent: 3190700 (1965-06-01), Fites
patent: 3774975 (1973-11-01), Schmidt
patent: 3964794 (1976-06-01), Scholz
patent: 4040673 (1977-08-01), Ahaus et al.
patent: 4300805 (1981-11-01), Reinecke
patent: 5615931 (1997-04-01), Stumpe et al.
patent: 5702163 (1997-12-01), Stumpe
patent: 5938295 (1999-08-01), Stumpe et al.
Butler Douglas C.
Christie Parker & Hale LLP
Hyundai Motor Company
LandOfFree
Braking force control valve and air brake system with the same does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Braking force control valve and air brake system with the same, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Braking force control valve and air brake system with the same will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2523760