초록 ▼

A dual type antilock braking device for four-wheeled vehicles wherein braking wheel cylinders for front and rear wheels are connected with each other in the form of X to provide first and second braking hydraulic systems. The device includes a pair of cylinders each of which has a central antilock c

A dual type antilock braking device for four-wheeled vehicles wherein braking wheel cylinders for front and rear wheels are connected with each other in the form of X to provide first and second braking hydraulic systems. The device includes a pair of cylinders each of which has a central antilock controlling hydraulic chamber defined between first pistons mounted at the inner ends of rods capable of slidably penetrating axially spaced partition walls, primary braking hydraulic chambers defined between the first pistons and the partition walls, and secondary braking hydraulic chambers defined between the partition walls and second pistons mounted at the outer ends of the rods. Each of the rods is formed with communicating grooves through which the primary braking hydraulic chamber is able to be communicated with the secondary braking hydraulic chamber when the rods moves inward by a distance exceeding a given amount. The primary braking hydraulic chambers of each cylinder are separately connected to a hydraulic source through the first and second braking hydraulic systems. The secondary braking hydraulic chambers are connected to wheel cylinders for the front and rear wheels in both braking hydraulic chambers, respectively. With this arrangement, if either one of the wheel cylinders for front and rear wheels in one braking hydraulic system be failed, the other wheel cylinder in the same system is also made inoperative, so that normal braking action can be effected using the remaining braking hydraulic system which continues to operate normally.

대표청구항 ▼

In an antilock braking device wherein braking wheel cylinders for a four-wheeled vehicle are connected with each other in the form of X to provide first and second braking hydraulic systems independent of each other, a dual type antilock braking device for four-wheeled vehicles comprising; cylinders

In an antilock braking device wherein braking wheel cylinders for a four-wheeled vehicle are connected with each other in the form of X to provide first and second braking hydraulic systems independent of each other, a dual type antilock braking device for four-wheeled vehicles comprising; cylinders (7) and (26) each closed at both ends thereof and divided into a central cylinder chamber and a pair of end cylinder chambers adjacent through first and second partition walls (9, 9′) or (28, 28′) which are located on both sides of said central cylinder chamber and spaced from each other in the axial direction; and pairs of rods (10, 10′) and (29, 29′) each pair capable of slidably penetrating through said partition walls (9, 9′) or (28, 28′), having first pistons (11, 11′) or (30, 30′) disposed in said central cylinder chamber and having second pistons (12, 12′) or (31, 31′) disposed in said corresponding end chambers, wherein primary braking hydraulic chambers (6) and (25) formed between said first partition wall (9), (28) and said corresponding first pistons (11), (30) are communicated with a hydraulic source in said first braking hydraulic system, secondary braking hydraulic chambers (14) and (33) formed between said first partition walls (9), (28) and said corresponding second pistons (12), (31) are respectively communicated with wheel cylinders (19) and (38) for front and rear wheels in said first braking hydraulic system, primary braking hydraulic chambers (6′) and (25′) formed between said second partition walls (9′), (28′) and said corresponding first pistons (11′), (30′) are communicated with a hydraulic source in said second braking hydraulic system, secondary braking hydraulic chambers (14′) and (33′) formed between said second partition walls (9′), (28′) and said corresponding second pistons (12′), (31′) are respectively communicated with wheel cylinders (19′) and (38′) for front and rear wheels in said second braking hydraulic system, antilock controlling hydraulic chambers (13) and (32) respectively formed between said paired first pistons (11) and (11′) and between said paired second pistons (30) and (30′) are communicated with an antilock controlling hydraulic system adapted to regulate output oil pressure from said secondary braking hydraulic chambers (14, 14′, 33, 33′), and said rods (10, 10′, 29, 29′) are respectively formed with communicating grooves (10a, 10a′, 29a, 29a′) through which said adjacent primary and secondary braking hydraulic chambers (17, 14; 17′,14′; 36, 33; 36′, 33′) are communicated with each other when said rods are moved toward said antilock controlling hydraulic chambers (13) or (32) by a distance exceeding a given amount.