Brake hydraulic control device for use in vehicle

A brake hydraulic control device for use in a vehicle, comprising:

• a master cylinder with a first reservoir attached thereto;
• a second reservoir different from said first reservoir;
• drive wheel control valve means switching communication and cut-off between a drive wheel brake and said master cylinder as well as communication and cut-off between said drive wheel brake and said second reservoir;
• driven wheel control valve means switching communication and cut-off between a driven wheel brake and said master cylinder as well as communication and cut-off between said driven wheel brake and said second reservoir;
• and
• a pump having a discharge port connected between said drive wheel control valve means and said drive wheel brake, and a suction port connected to said master cylinder through an open/close switch valve and to said second reservoir,
• wherein said drive wheel control valve means comprises:
• a first normally open electromagnetic valve switching communication and cut-off between said drive wheel brake and said master cylinder;
• and
• a first normally closed electromagnetic valve switching communication and cut-off between said drive wheel brake and said second reservoir, and
• said driven wheel control valve means comprises:
• a second normally open electromagnetic valve having an orifice and switching communication and cut-off between said driven wheel brake and said master cylinder;
• a one-way valve connected in parallel to said second normally open electromagnetic valve;
• and
• a second normally closed electromagnetic valve switching communication and cut-off between said driven wheel brake and said second reservoir.

A brake hydraulic control device for use in a vehicle, comprising:

• a master cylinder with a first reservoir attached thereto;
• a second reservoir different from said first reservoir;
• a drive wheel control valve means switching communication and cut-off between a drive wheel brake and said master cylinder as well as communication and cut-off between said drive wheel brake and said second reservoir;
• a driven wheel control valve means switching communication and cut-off between a driven wheel brake and said master cylinder as well as communication and cut-off between said driven wheel brake and said second reservoir;
• a pump having a discharge port connected between said drive wheel control valve means and said drive wheel brake and a suction port connected to said first reservoir through open/close switch valve and to said second reservoir;
• parallel pipes for operational fluid to flow (i) from said master cylinder to said drive wheel brake and (ii) said master cylinder through said pump to said drive wheel brake;
• and
• a pipe for operation fluid to flow from said master cylinder to said driven wheel brake but bypassing the pump.

A brake hydraulic control device for use in a vehicle, comprising:

• a master cylinder with a first reservoir attached thereto;
• a second reservoir different from said first reservoir;
• a drive wheel control valve means switching communication and cut-off between a drive wheel brake and said master cylinder as well as communication and cut-off between said drive wheel brake and said second reservoir;
• a driven wheel control valve means switching communication and cut-off between a driven wheel brake and said master cylinder as well as communication and cut-off between said driven wheel brake and said second reservoir;
• and
• a pump having a discharge port connected between said drive wheel control valve means and said drive wheel brake and a suction port connected to said first reservoir through open/close switch valve and to said second reservoir,
• wherein said drive wheel control valve means comprises:
• a first normally open electromagnetic valve switching communication and cut-off between said drive wheel brake and said master cylinder;
• and
• a first normally closed electromagnetic valve switching communication and cut-off between said drive wheel brake and said second reservoir, and
• said driven wheel control valve means comprises:
• a second normally open electromagnetic valve having an orifice and switching communication and cut-off between said driven wheel brake and said master cylinder;
• a one-way valve connected in parallel to said second normally open electromagnetic valve;
• and
• a second normally closed electromagnetic valve switching communication and cut-off between said driven wheel brake and said second reservoir.

A brake hydraulic control device for use in a vehicle, comprising:

• a master cylinder with a first reservoir attached thereto;
• a second reservoir different from said first reservoir;
• a drive wheel control valve unit switching communication and cut-off between a drive wheel brake and said master cylinder as well as communication and cut-off between said drive wheel brake and said second reservoir;
• a driven wheel control valve unit switching communication and cut-off between a driven wheel brake and said master cylinder as well as communication and cut-off between said driven wheel brake and said second reservoir;
• and
• a pump having a discharge port connected between said drive wheel control valve unit and said drive wheel brake, and a suction port connected to said master cylinder through an open/close switch valve and to said second reservoir.

A brake hydraulic control device for use in a vehicle, comprising:

• a master cylinder with a first reservoir attached thereto;
• a second reservoir different from said first reservoir;
• a drive wheel control valve unit switching communication and cut-off between a drive wheel brake and said master cylinder as well as communication and cut-off between said drive wheel brake and said second reservoir;
• a driven wheel control valve unit switching communication and cut-off between a driven wheel brake and said master cylinder as well as communication and cut-off between said driven wheel brake and said second reservoir;
• and
• a pump having a discharge port connected between said drive wheel control valve unit and said drive wheel brake and a suction port connected to said first reservoir through open/close switch valve and to said second reservoir.