Mercedes-Benz Aktiengesellschaft

Walter Alfmeier Gmbh & Co.

Daimler-Benz Ag

Walter Alfmeier Gmbh

Klaus-Jurgen Heimbrodt

Holger Seel

Rudolf Andres

Dieter Feichtiger

Dietmar Zwolfer

Dieter Simon

Gerold Dierks

Klaus Engelhardt

Michael Dimitrov

Josef Schumacher

Hermann Moller

Christian Grabner

Tobias Reis

Georg Klink

An actuating drive for installation in a body of a motor vehicle, from whose housing an actuator guided therein can be retracted and extended through an exit opening. A mount is provided for attaching the housing to the body with the exit opening of the attached housing being supported at the edge on an edge of a body opening that can likewise be penetrated by the actuator. According to the invention, the housing is guided so as to be displaceable with respect to the mount to and fro along a displacement axis in the direction of movement of the actuator. A clamping device is provided for displacing the housing with respect to the mount along the displacement axis, by means of which the housing, which is supported on one side at least indirectly on the mount, can be clamped on the other side against the edge of the body opening.

Actuating drive for installation in a body of a motor vehicle

A regulator with a hysteresis-affected characteristic curve has a manually operable actuating element for presetting a desired control variable, an axially displaceable control slide for adjusting the preset control variable and a control incline which is coupled to the actuating element. The control incline converts, by means of a rising control face, the adjustment movement of the actuating element into a axial displacement of the control slide. For the purpose of compensating the hysteresis when adjusting a control a variable such that the same control variable is brought about by rotating the actuating element to the left or to the right into the same setting, the control incline bears a toothing along its control face. Each tooth has, in two planes which extend along the displacement direction of the control face and are perpendicular to one another, a sawtooth-like contour with in each case a rising edge for running up the control slide and a falling edge which follows in the displacement direction. Each tooth contour is associated with one of the two displacement directions. Each tooth contour is associated with one of the two displacement direction of the control incline and deflects the control slide in the axial direction or transversely thereto.

Regulator with hysteresis-affected characteristic curve

A pressure regulator whose initial pressure can be set by manually setting the initial stress of a control spring has a double-seated valve with an inner and outer valve seat and a valve closing element. The valve closing element divides a supply pressure chamber from a control pressure chamber and the latter from a pressure-relief chamber. The inner valve seat is arranged on a control piston which is loaded by the control spring. In order to set a higher initial pressure, the initial stress of the control spring is increased, in order to reduce pressure, the initial stress of the spring is diminished. During this process, the outer or inner valve seat lifts off temporarily from the valve closing element until equilibrium is reestablished by a corresponding pressure chamber and the double-seated valve closes. In order to compensate the hysteresis occurring here, a lifting device is provided which, when the initial stress of the control spring is reduced, briefly lifts off the inner valve seat from the valve closing element and then becomes inactive again. The superproportional pressure drop associated with this in the control pressure chamber has the effect that the equilibrium of forces for closing the double-seated valve is always produced after the outer valve seat is opened by the pressure increase.

Pressure regulation

A pneumatic central locking system for doors and/or lids in motor vehicles, with a pneumatic operating or locking element being provided for each lock mechanism of the doors and/or lids so as to enable the same to be locked and unlocked. An electrically drivable air pump is connectible with the locking elements by a line system and a selector valve is disposed at an outlet side of the air pump. The selector valve acts upon the line system and/or the locking elements in a desirable manner by means of an additional pneumatic operating or switching element connected fluidically in parallel at the locking elements. A response pressure of the switch element is higher than that of the locking elements. At least one lock mechanism contains a key operable first selector switch, with a second selector switch which may be operated by the switching element. Both of these selector switches are connected by power leads to the electric drive for the air pump and are connected electrically in series with one another in such a fashion that when the central locking system is in a steady state, the power to the electric drive is interrupted. In addition to a pressure dependent actuation of the second selector switch, the switching element also provides an additional operating drive for the second selector switch which responds as a function of time.

Pneumatic central locking system

Growing community of inventors

Treuchtlingen, Germany

Klaus-Jurgen Heimbrodt