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Brake Booster

  • US 4,645,272 A
  • Filed: 05/06/1985
  • Issued: 02/24/1987
  • Est. Priority Date: 06/02/1984
  • Status: Expired due to Fees
First Claim
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1. A brake system for a vehicle having a brake pressure source (12, 20), a pedal for controlling fluid from said brake pressure source, a master brake cylinder, a master brake cylinder Piston (2) displaceable in said master brake cylinder that can be acted upon by said fluid from the brake pressure source (12, 20), four brake lines (VL, HR, HL, VR), which lead to four different wheel brakes which receive fluid under pressure from said master brake cylinder, and of which the first brake line (VL) and second brake line (HR) are suppliable from the master brake cylinder (1), and an anti-skid apparatus, said anti-skid apparatus includes valve means (24 or 24'"'"'+25) for varying brake pressures with the aid of a pressure medium from said brake pressure source (12,20) in accordance with a rotational behavior of at least one wheel associated with said wheel brakes,said valve means (24 or 24'"'"'+25) of said anti-skid apparatus are connected to said brake pressure source (12, 20) such that the brake fluid pressure in a third brake line (VR) is variable directly and in said first brake line (VL) and second brake line (HR) are variable via said master brake cylinder piston (2);

  • a further valve means (26), which is embodied in the form of a 2/2-way valve, is inserted between said master brake cylinder (1) and said second brake line (HR) suppliable by said master brake cylinder for the purpose of temporarily maintaining a constant brake pressure in said second brake line (HR);

    a standard pressure regulator (27) disposed following said further valve means (26) and before said second brake line (HR);

    a followup control valve (28) which is embodied in the manner of a controllable check valve is connected via a control inlet to said second brake line (HR) and forms a closable connection between said brake pressure source (12,

         20) and a fourth brake line (HL), wherein said control inlet opens into a control cylinder, in which a control piston loaded by an opening spring is displaceable, said control piston being subjected on one side to the pressure from said second brake line (HR) and on an opposite side to the pressure of said fourth brake line (HL), and wherein elements of said followup control valve (28) are disposed such that said followup control valve (28) opens on its own in the event of a pressure drop in a direction of the brake pressure source (12,

         20); and

    said second brake line (HR) associated with said standard pressure regulator (27) and said fourth brake line (HL) beginning at said followup control valve (28) are associated with one axle of said vehicle.

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