Filterwerk Mann + Hummel Gmbh

Lothar Bendig

Arthur Klotz

Rolf Fusser

Richard Hoferer

A suction-limiting check valve for a crankcase ventilating line which is connected to the engine intake downstream of the carburetor, the valve having two valve devices arranged for parallel operation, each including a spring-biased diaphragm which closes against a valve mouth at a predetermined level of negative pressure, one valve mouth being much smaller than the other to produce an earlier reopening of that valve device under elevated suction on the outlet side of the valve.

Ventilation check valve for internal combustion engines

A flapper-type combustion air mixing valve at the junction between a cold air intake duct and a warm air intake duct, the flapper being pivotally adjustable by means of an electropneumatic actuator which has a spring-loaded diaphragm separating an enclosed air-filled pressure chamber from an open drive chamber accommodating the spring and the flapper drive linkage. A heater coil in the pressure chamber receives variable power from a signal transformer, in response to a combustion air temperature sensor and a flapper position sensor. A load-responsive vacuum switch connected to the engine intake manifold switches the signal transformer between adjustments for a higher nominal control temperature for partial-load operation and a lower nominal control temperature for full-load operation.

Electronically controlled combustion air mixing valve for internal

A one-way throttling valve for use in the vacuum line of a pneumatic membrane actuator which controls the combustion air temperature of a carburetor-euipped internal combustion engine by means of an air flow proportioning flapper admitting cold raw air and/or preheated raw air into a duct junction upstream of the intake filter, the throttling valve having a tiny throttling orifice which remains open, while the throttling valve itself is closed, thereby delaying the removal of negative pressure from the pneumatic actuator. The one-way throttling valve may be arranged in one of the two vacuum line connectors of the valve housing of a thermostat relief valve.

One-way throttling valve for pneumatic membrane actuator in engine air

A device for automatically regulating the intake air temperature of a carburetor-equipped internal combustion engine whose air intake system includes a flow proportioning pivotable flapper in a duct junction admitting cold raw air and/or preheated raw air to the air intake filter, depending on the ambient temperature, the flapper position being controlled by a pneumatic membrane actuator receiving negative pressure from the engine intake manifold, via a vacuum line with a thermostat-controlled pressure relief valve which reads the temperature of the raw air mixture. In the cold air intake duct is arranged a temperature-responsive unit, in the form of either a wax thermostat or a bimetallic spiral and disc cam, which serves as a position-adjustable stop thereby preventing the flapper from completely closing the warm air intake duct, when the engine takes in cold air, operating at full load.

Device for regulating the intake air temperature of a

A device for adjusting the intake air temperature of carburetor-equipped internal combustion engines having an air intake system with a flapper valve in a duct junction admitting cold raw air and/or preheated raw air to the intake filter, depending on the raw air temperatures, the flapper valve position being controlled by a pneumatic membrane actuator receiving negative pressure from the intake manifold, via a vacuum line with a thermostat-controlled relief valve responsive to the temperature of the air mixture. In the drive connection between the membrane actuator and the flapper is arranged a wax thermostat which increases or decreases the effective length of the connection in response to the ambient air temperature, thereby adding the thermostat displacements to the actuator displacements.

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Ludwigsburg, Germany

Lothar Bendig