Hydraulic antilock brake device

摘要

A hydraulic antilock brake device, comprises an oil tank filled with hydraulic oil, a pump electric motor group, a one-way valve, a piloted overflow valve, a manual two-position three-way valve, an adjustable throttling valve, an adjustable throttle valve, a high pressure oil inlet tube, and an oil return tube. the high pressure oil inlet tube and the oil return tube are communicated with a hydraulic controlled negative feedback two-position four-way valve, which is communicated with a brake cylinder connected with a friction sheet. Fast valve holes are provided at two ends of an inner chamber of said hydraulic controlled negative feedback two-position four-way valve, and fast valves are located in the fast valve holes. Two ends of an inner chamber of said braking cylinder are provided with feed-back grooves communicated with the fast valve holes by oil passage. The hydraulic antilock brake device can ensure the driving safety.

主权项

1. A hydraulic antilock brake device, comprising:
an oil tank containing hydraulic oil, a separating board formed inside the oil tank, defining a precipitating space and an oil space at the bottom of the oil tank; a one-way valve; a piloted overflow valve; a manual two-position three-way valve; a first manual two-position three-way valve; an adjustable throttling valve; a pump electric motor group, Entrance of the pump electric motor group laid in the oil space and output of the pump electric motor group connected with the one-way valve, the one-way valve connected with the piloted overflow valve and the manual two-position three-way valve, Exit of the piloted overflow valve communicated with the oil tank in the precipitating space, and the first manual two-position three-way valve jointed with a adjustable throttling valve; a high pressure oil inlet tube; an oil return tube; a hydraulic controlled negative feedback two-position four-way valve, comprising a valve body, a valve core chamber defined inside the valve body, the valve body comprising an oil leading-in opening (P) and an oil returning opening (O), The oil leading-in opening communicated with the adjustable throttling valve by the high pressure oil inlet tube, the oil returning opening communicated with the oil return tube, exit of the oil return tube arranged in the precipitating space of the oil tank; oil returning slots defined along the axial direction in the upper and lower wall of the valve core chamber of the hydraulic controlled negative feedback two-position four-way valve, thereby keeping the valve core chamber next to the end portions of the valve core being communicated with the oil return tube, and reducing motion resistance force when the valve core reciprocating therein; a first and second fast valve holes defined at endportions of the valve core chamber, and the first and second fast valve holes communicated with the valve core chamber; a first and second fast valves respectively mounted in the first and second fast valve holes; at least a first brake cylinder, connected with a friction sheet; an upper negative feedback groove and a lower negative feedback groove defined at two endportions of the first brake cylinder, the upper negative feedback groove communicated with the second fast valve hole in the hydraulic controlled negative feedback two-position four-way valve, the lower negative feedback groove communicated with an oil controlling channel, and exit of the oil controlling channel jointed with the first fast valve hole of the hydraulic controlled negative feedback two-position four-way valve; the first brake cylinder is divided by a piston into a non-piston chamber and a piston chamber, side of upper portion of the non-piston chamber communicated with an upper channel, the upper channel jointed with an A opening of the hydraulic controlled negative feedback two-position four-way valve, side of the bottom of the piston chamber communicated with a lower channel, and the lower channel jointed with a B opening of the hydraulic controlled negative feedback two-position four-way valve; the friction sheet driven by the first brake cylinder, so as to hold tight and release the disc quickly thereby forming the cadence braking; a hydraulic control two-position three-way valve is parallel connected to an outlet of the one-way valve, a second manual two-position three-way valve is engaged with an outlet of the hydraulic control two-position three-way valve, a second brake cylinder is engaged with an outlet of the manual two-position three-way valve, and the second brake cylinder is engaged with a tensional parking brake, an elastic member is mounted in a piston chamber of the second brake cylinder; when the pressure in a hydraulic pressure system is not enough, relating service braking system is unable to work, hydraulic oil cannot turn on the hydraulic control two-position three-way valve, and the hydraulic oil directly flows back to the oil tank through the oil returning hole of the hydraulic control two-position three-way valve, therefore the second brake cylinder is unable to start working, under effect of the elastic member inside the second brake cylinder, make the tensional parking brake locking the hub of the wheels or the braking disc; when the pressure in the hydraulic pressure system increases to a normal pressure range, the second brake cylinder starts to work, and overcomes pressure of the elastic member, the vehicle is normally operated.