Itt Industries, Inc.

Other

Derek R Lowe

Bernd Schopper

Peter Tandler

Hans-Dieter Reinartz

Volker Berisch

Hydraulic brake system for avoiding high brake or traction slip values

A dual-circuit master cylinder having hydraulic equalization is disclosed including a casing having two parallel bores and elongated pistons defining two power chambers in the casing connected to wheel brakes, a yoke including two blind bores receiving extending portion of the pistons defining two equalization chambers, an auxiliary piston operatively connected to the yoke, and a brake actuating member defining an auxiliary chamber connected to a supply reservoir via a check valve for supplying equal pressurized fluid to the equalization chambers upon movement of the auxiliary piston and yoke to displace the power pistons.

Dual-circuit master cylinder having auxiliary piston and yoke with

A connecting arrangement for connecting two hollow components of a hydraulic circuit to one another, especially a pipe or hose to a mating component, includes a guiding formation on one of the components, especially the mating component, and a mounting formation connected to the other component, these formations having correlated cross-sectional shapes such that the guiding formation guides the mounting formation in a predetermined direction, especially the longitudinal direction of the one component, and prevents relative displacement in all other directions. The mounting formation is advantageously constituted by a separate mounting element which is affixed to the other component by a threaded connection, such as by a screw cap. The formations advantageously have complementary dovetail-shaped cross-sectional configurations. The formations have respective passages which register with one another in the assembled position of the components and which are surrounded by a seal arranged in the interface between the components.

Connecting arrangement, especially for tubular elements

In a known dual-circuit braking pressure control valve, a tilting lever arrangement is provided for distribution of the preloading force to the two control pistons, whereby the change-over point of the intact brake circuit is increased upon failure of one brake circuit. The tilting lever arrangement is complicated with respect to its construction and assembly, and its mode of operation is not safe. According to the present invention the tilting lever arrangement is replaced by a carrier bridge at the ends of the two pistons which synchronizes the points of application of the preloading forces by allowing a slight relative movement betweeen the two pistons when both of the brake circuits are operative.

Dual-circuit pressure control valves

A pressure reducer for hydraulic brake systems comprises a stepped piston carrying a sealing ring in a circumferential groove thereof. The sealing section of the sealing ring begins at the groove wall adjacent the outlet chamber and joins a transitional section of smaller diameter adjacent the inlet chamber. The sealing ring fills the groove essentially completely at least in the sealing section. Preferably the sealing ring abuts the bottom of the groove over its entire axial length. This results in a defined position for the sealing section without excessive friction and wear occurring during operation.

Pressure reducer for hydraulic brake systems

Dual circuit pressure control valves for brake system are known in which the control pistons are located parallel to each other with each control piston controlling a different one of two brake circuits. Both control pistons are loaded by a common preloading force. The known arrangement is complicated in its construction and has a large overall length. According to the present invention, the construction is simplified and the overall length is reduced by providing a torsion spring which provides the preloading force acting on the control pistons via stationarily supported swivelling levers.

Dual-circuit pressure control valves are known in which the control pistons are acted upon by a common control force. A preload distributor constructed as beams of balance to compensate for differences in the control behavior of the two control valves due to manufacturing tolerances have not provided the desired compensation. Therefore, according to the present invention an improved compensation arrangement is provided in the form of a compensating piston which is subjected to the outlet pressures of the two brake circuits.

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Glashuetten, Germany

Derek R Lowe