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The Nippon Air Brake Co., Ltd. patent solves the following problem:
This invention relates to a pneumatic-hydraulic brake booster or air-hydraulic brake booster for a vehicle.
Our analysis of this patent is as follows:
Nippon Air Brake Co., Ltd.’s patent US 4773222 A deals with Pneumatic brake booster with booster-cylinder-end retained relay valve.
A pneumatic-hydraulic booster for the vehicle includes a master cylinder side; a pneumatic cylinder side with the master cylinder portion includes a power piston slidable fitted with a cylindrical casing and an output rod fixed to the power piston, handed the master cylinder side; a partition wall body fitted cylindrical casing; and a relay valve portion is arranged on the opposite side of the partition wall body from the power piston cylindrical casing. The relay valve supplies compressed air to an air pressure chamber formed between the partition wall body, and the power piston and discharge the compressed air from the air pressure chamber to the atmosphere. When compressed air suppplied air into the pressure chamber through the relay valve of the power piston and the output rod has been moved forward to create the hydraulic pressure in the master cylinder. The hydraulic pressure applied to a wheel cylinder for braking. The cylindrical casing open side of the body opposite partition wall in the power piston, and a cover member fixed to the cylindrical casing in a well covered with bars. The relay valve of sitting among the members of the cover and the partition wall body.
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