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Brake system with brake booster
| Details |
Inventors: Leiber, Heinz;
Assignee: Robert Bosch GmbH (Stuttgart, DE)
Primary Examiner: Reger; Duane A.
Assistant Examiner:
Attorney, Agent or Firm: Greigg; Edwin E.
A brake system having a master cylinder for generating brake pressures in at least one closed brake circuit (I, II) and having an associated brake booster including a booster cylinder, a displaceable booster piston having a piston rod oriented into the master cylinder and a tappet arranged to plunge into the booster cylinder by means of a brake pedal and be displaced counter to the booster piston and is equipped with a brake valve connected to a pressure supply device, which brake valve is controllable by means of the relative movement of the tappet with respect to the booster piston. The brake system may be modified to become an anti-drive-slip apparatus via brake pressure maintenance valves built into the brake circuits (I, II), as well as a 3/3-way valve, by means of which pressure medium can be sent directly from the pressure supply device for exerting boosting action on the booster piston into the booster cylinder. Pressure in-feed causes a displacement of the booster piston and accordingly brings about the generation of brake pressures for overcoming drive slip. Once the drive slip is substantially eliminated, then the booster cylinder is relieved of pressure by means of the 3/3-way valve, so that the booster piston moves in the direction of its basic position. |
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DETAILED DESCRIPTION It is a principal object of the invention to provide a brake system having the advantage over the prior art that drive wheel slip can be reduced while using a master cylinder that is suitable for emergency braking if the boosting fails and while using closed brake circuits which have a high degree of operational reliability.
It is another object of the invention to embody the brake valve and booster piston in a spacesaving and inexpensive manner together and so as to prevent a disadvantageous outflow of pressure medium from the booster chamber while the drive wheel slip is being reduced.
It is still another object to the invention to provide that the brake valve, in the unactuated state, leaves open merely a throttle cross section, which on the one hand diverts leakage flows away and on the other hand, when pressure medium is fed into the booster chamber in order to reduce the drive wheel slip, the brake valve effects a pronounced pressure increase in this booster chamber, thus causing an extremely rapid acceleration of the booster piston in the direction of the master cylinder.
It is yet another object of the invention that in the case of braking controlled via the brake pedal, that for rapid reduction of boosting pressure by retracting the brake pedal, a maximum possible cross section is providable for reducing pressure.
It is still a further object of the invention that the maximum possible spacing between the booster piston and the tappet is limited, and that the brake valve therefore have an extent no longer, or only insignificantly longer, than brake valves known in the prior art.
It is yet a further object of the invention to provide an economical exemplary variant, which is particularly easily realized if the booster piston is cup-shaped in embodiment and is aligned as such that the tappet can plunge with at least a portion of its length into the booster piston.
In addition, this construction has the advantage that a pressure can be fed into the auxiliary chamber which pressure displaces the piston rod in the direction of the master cylinder to thereby effect the switchover of the brake valve into an additional third switching position, so as to prevent the outflow of pressure medium from the booster chamber
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