Abstract: The invention provides an open breather chamber in front of the breather chamber proper with the cross-sectional and length ratios lying within certain configurations so that solids, fluid and steam particles will enter the breather chamber and not cause problems within a chamber containing working components.

Abstract: The present invention teaches a control input device particularly suited to a number of applications on a motor vehicle. The device can be activated by the foot of an operator to transmit an electrical output signal which is a function of load or displacement. Such control input device includes a leaf spring mounted such that it can be bent in response to an application of a foot force. Attached to the leaf spring is a sensor which measures the bowing of the leaf spring and transmits a corresponding electrical output signal.

Abstract: The present invention teaches a brake cylinder which is formed by a cylindrical housing and a cylinder base. The cylindrical housing and cylinder base are joined together by a bayonet connection and form a pressure chamber. The bayonet connection is designed pressure-tight, and it is located on the pressurized-side of a circular sealing element which seals off the cylinder base from the cylinder housing. The bayonet connection is thereby protected from the entry of detrimental environmental influences, especially dirt and moisture, and it can still be easily disassembled at all times.

Abstract: A warning device for a pneumatic vehicle tire. The device includes a measurement unit which is mounted at the rim or at the wheel and which is connected with the inner space of the tire. A contact element penetrates the rim and points towards the inner surface of the tire which is opposite to the running surface, and which can be activated towards the inside of the wheel by allowing the inner surface to run against the rim surface. By activating the contact element, a nearly pressureless condition of the tire will be recorded.

Abstract: A solenoid operated control valve for use as an inlet and/or exhaust valve in a pressure modulator has a flat valve element cooperating with a flat valve seat to control the flow of fluid through the valve. At least a portion of the solenoid armature has opposed parallel flat surfaces and is disposed within a gap defined between parallel faces for movement axially within the gap to operate the valve. The flat valve seat is disposed in the plane of one of the parallel faces and one of the parallel faces is a face of the stator. All required settings, more particularly, magnetic reach, the energized gap and excess valve travel to compensate for wear are set automatically by spacers. The spacers give the required settings directly from their own thickness and not through other component dimensions in combination.

Abstract: A stop apparatus for a plate valve of a fluid compressor is provided. The stop apparatus is equipped with a wear-resistant insert so that the wear on some compressor components can be reduced.

Abstract: A sealing device particularly suitable for sealing pistons of working cylinders and for sealing two machine components which can slide against one another is disclosed. A conventional sealing element consisting of low-friction, but not very elastic material, such as PTFE plastic material, and resting on an elastic support, is used. The cross-section of the sealing element in a direction of the sliding motion is U-shaped and encircles the support. The dimensions of the support and the sealing element are determined such that the support exerts prestress forces on the sealing element which try to bend the rim areas of the sealing element outward against the sliding surface for the sealing element. Consequently, an additional force component, directed toward the sliding surface, results for the pressure force which is exerted on the sealing element by the support and functions as a sealing force.

Abstract: A check valve assembly in which a valve spring is positioned with respect to the valve body in a manner such that the deformation line of such valve spring is one of offset and inclined in relation to the longitudinal axis of the valve body so that one side of such valve body is pressed against a guide provided for such valve body while the inlet valve is in an open position. The valve body of the check valve is prestressed against a valve seat by the valve spring.

Abstract: A piston assembly is disclosed which reduces the consumption of a lubricating agent circulated to provide lubrication between the outer sidewall of the piston assembly and the interior sidewall of a bore. This is accomplished by providing at least one aperture in at least one compression ring groove. The aperture is disposed in fluid communication with the interior of a hollow skirt portion of the piston for communicating such lubricating agent gathered in the compression ring groove into the interior of the hollow skirt portion of the piston so that the lubricating agent can return to the crankcase of an operating mechanism.

Abstract: An electrically-controlled fluid pressure responsive brake system, in which a solenoid valve is installed between a manual brake valve and a parking brake. The parking brake is equipped with a spring actuator. The solenoid valve can be positioned by an electronic system into an open position only when an ignition switch has been turned on and the brake system has been successfully tested by the electronic system. The test can be initiated by pressing the brake pedal all the way to the floor. The solenoid valve allows the release of the parking brake only if the brake system is intact.

Abstract: A motor vehicle having an anti-locking brake system and a drive traction regulation system. The vehicle has one drive axle and a non-driven front or rear axle and is equipped with a preferably four-channel ABS/ASR electronic system. The invention provides between the brake cylinders of the drive axle and the front or rear axle a double check valve on each side. Both double check valves are activated together by one brake line. This arrangement prevents the non-driven wheels of the front or rear axle from being braked undesirably when the drive traction regulation system of the driven wheels is in operation.

Abstract: An automatic activation apparatus for a differential pawl which is independent of intervention by an operator of a vehicle, the invention controls the energy supply to the actuator by means of a control logic with two signal inputs. The control logic is fed a wheel slip signal directly at one signal input, and via a break-delay timing element at its other signal input. The control logic is thereby designed so that, by the excitation of both signal inputs, it switches into a standby position and then into its active position only upon the excitation of its signal input connected with the timing element.

Abstract: A bidirectional flow communication passageway is provided by the present invention in a multiple-circuit fluid pressure responsive system on a motor vehicle to allow a gradual reduction of pressure in a parking brake circuit which is a part of such system. The passageway is restricted to limit such bidirectional flow to a predetermined level. The pressure reduction permitted is sufficient to activate a parking brake valve in such parking brake circuit when a defect occurs in an operating service brake circuit which is also a part of such system.

Abstract: The present invention is a braking value transmitter with a pedal to modulate the braking pressure. The pedal is braced against a spring. The force exerted by the pedal or the position of the pedal is sensed by an electronic sensor. The output signal of the sensor is fed to an electronic system, which transforms the approximately linear characteristic of the sensor into a progressive characteristic.

Abstract: The present invention provides a pressure regulating valve which substantially avoids shutoff noises. The pressure regulating valve is designed such that the opening process of the shutoff valve proceeds in two steps. The two-step switching process is made possible by the provision of a seal ring which slides on an activating piston which activates the shutoff valve. This seal ring acts upon a housing mounted detent and an activating piston mounted additional detent, thus creating an automatically acting additional surface area for the activating piston. This design also makes it possible to increase the safety function of the pressure regulating valve, by increasing the pressure medium activated surface area of the valve body for the shutoff valve without incurring higher work forces at the activating piston.

Abstract: A bidirectional flow communication passageway is provided by the present invention in a multiple-circuit fluid pressure responsive system on a motor vehicle to allow a gradual reduction of pressure in a parking brake circuit which is a part of such system. The passageway is restricted to limit such bidirectional flow to a predetermined level. The pressure reduction permitted is sufficient to activate a parking brake valve in such parking brake circuit when a defect occurs in an operating service brake circuit which is also a part of such system.

Abstract: A bidirectional flow communication passageway is provided by the present invention in a multiple-circuit fluid pressure responsive system on a motor vehicle to allow a gradual reduction of pressure in a parking brake circuit which is a part of such system. The passageway is restricted to limit such bidirectional flow to a predetermined level. The pressure reduction permitted is sufficient to activate a parking brake valve in such parking brake circuit when a defect occurs in an operating service brake circuit which is also a part of such system.

Abstract: The present invention provides a method and apparatus for reconditioning a draft gear assembly friction clutch mechanism. The apparatus comprises a generally rectangular substantial flat plate member having at least one protuberance extending outwardly from one side of such plate member. The friction clutch mechanism reconditioning method includes the steps of removing each component of the friction clutch mechanism from an open end of the draft gear housing. Then engaging the plate member with an outer surface of one of the outer stationary plates of the friction clutch mechanism in a position such that the protuberance extends into a recess on the outer surface. Thereafter reassembling the friction clutch mechanism into the open end of the draft gear housing in a position such that an opposite surface of the plate member engages a portion of a wall surface of the housing.

Abstract: The present invention teaches an activation apparatus for a differential pawl. Such activation apparatus is designed to prevent damage to components of the differential pawl and/or of the drive train resulting from operator error. According to the invention, when a drive wheel slips, a first apparatus acquires a slip signal; and when a slip signal is present, a second apparatus prevents the pressurization of a pressure-medium-operated actuator apparatus of the activation apparatus.

Abstract: A sensing means is provided to indicate an operating condition of a spring brake cylinder assembly in which such operating condition may be one of a brake applied and a brake release position. The sensing means engages a clutch control mechanism which includes means to engage the sensing means at different locations to make a determination of such operating condition.