Intermittently braking apparatus for anti-locking purpose

A braking apparatus comprising:

• a braking system (100) including a brake master cylinder (1) for delivering hydraulic oil for braking purpose upon treading of a brake pedal (11) pivotally mounted in a vehicle;
• a plurality of wheel cylinders (14, 14a) for a plurality of front and rear wheels of the vehicle for braking the wheels by the hydraulic oil delivered from said master cylinder (1) as controlled by a multi-pass rotary valve (2) and an expansion-cylinder (40);
• and
• said multi-pass rotary valve (2) having a rotor (24) rotatably mounted in said rotary valve (2) for alternatively delivering and interrupting the hydraulic oil from said master cylinder (1) to said wheel cylinders (14, 14a) for intermittently braking and releasing the wheels for anti-locking purpose, and said rotor (24) driven by a driving motor (36) of an electrical driving circuit (3) including:
• a power source (31), a starting switch (34) normally switching off the driving circuit (3) as urged by said brake pedal (11) of said brake master cylinder (1) of said braking system when not in braking operation and operatively switching on the driving circuit (3) when treading the pedal (11) for braking purpose, an indicator lamp (35) operatively lit on when the starting switch (34) is actuated for braking operation, and said driving motor (36) electrically connected to the power source (31) and controlled by the starting switch (34) for on and off operation of said motor, and a motor shaft (361) axially connected with the rotor (24) of the valve (2) by aligning an axis of the motor shaft (361) with a rotating axis (241) of the rotor (24);
• the improvement which comprises:
• said multi-pass rotary valve (2) including:
• a housing (21) confining a rotor chamber (20) in the housing (21), the rotor (24) rotatably mounted in the rotor chamber (20) and having a plurality of thrusting cavities (26, 26a, 26b, 26c) circumferentially recessed in the rotor (24), a plurality of blade portions (27, 27a, 27b, 27c) generally radially formed on the rotor (24) each blade portion separating every two neighboring thrusting cavities (26), a first and a second input port (22, 22a) formed on the housing (21) of the valve (2) and communicating with a hydraulic oil delivery conduit (12) for directing the hydraulic oil into each thrusting cavity in the rotor (24) for thrusting the rotor (24) for its rotation, a first and a second braking outlet (23, 23a) formed on the housing (21) of the valve (2) and communicating with the hydraulic oil distributing conduit (13) for delivering the hydraulic oil to the wheel cylinders (14, 14a) for braking vehicle wheels, and a first and a second returning port (25, 25a) formed on the housing (21) of the valve (2) and communicating with the hydraulic oil returning conduit (15) for returning the hydraulic oil to the expansion-cylinder (40), with each said thrusting cavity rotatably alternatively confining and communicating each said input port and each said braking outlet preliminarily for delivering the hydraulic oil from the delivery conduit (12) to the distributing conduit (13) for wheel braking purpose;
• and confining and communicating each said braking outlet (23) and each said returning port (25) secondarily for returning the hydraulic oil from the distributing conduit (13) to the returning conduit (15) for returning the hydraulic oil into the expansion-cylinder (40);
• and
• said rotor (24) having four blade portions (27, 27a, 27b and 27c) radially formed on said rotor (24) and rotatably mounted in the housing (21) of the multi-pass rotary valve (2) about said rotating axis (241) longitudinally secured in the housing (21), and including:
• a first, second, third and fourth thrusting cavity (26), (26a), (26b) and (26c) circumferentially recessed in the rotor (24) each said thrusting cavity generally parabolic shaped having a shallow recess portion (261) adjacent to a first blade portion (27) and a deep recess portion (262) continuously arcuate shaped from the shallow recess portion (261) towards a second blade portion (27a) neighbouring the first blade portion (27);
• and said four blade portions (27), (27a), (27b) and (27c) generally spirally formed about the rotating axis (241) of the rotor (24) with each blade portion separating every two neighbouring thrusting cavities;
• and four small recesses (28), (28a), (28b) and (28c) formed on the circumference face of each said blade portion (27), (27a), (27b) and (27c);
• and each said input port and each said returning port confined in each quadrant of a rotating circle of 360 degrees of the rotor chamber (20) of the valve (2) with each said braking outlet generally disposed in a central portion between each said input port and each said returning port, and with each said input port disposed about an input axis inclinedly intersecting a cylindrical wall of the rotor chamber (20) to be operatively extrapolatively tangential to the recess portions parabolic shaped when each said blade portion is started at a zero degree of each quadrant of the rotating circle, thereby primarily communicating one said input port with one said braking outlet by one said thrusting cavity and blocking one said returning port by one said blade portion;
• and secondarily communicating one said braking outlet and one said returning port by one said thrusting cavity and blocking one said input port by one said blade portion, for intermittently braking and releasing of the wheel cylinders (14, 14a) for anti-locking purpose.