Actuator which can be drive-coupled and has a variable displacement pump

Abstract

The invention relates to an actuating device (1) for actuating a clutch (3) and / or a transmission (4) of a motor vehicle, comprising a pump (10) having two fluid connections (8, 9) and comprising a movable actuating element (11) fluidically connected to a first fluid connection (8) of the pump (10), wherein the pump (10) is designed such that in a first pump position, in which the pump is driven in a first direction of rotation, for extending the actuating element (11) the pump conveys a pressure fluid in a first conveying direction from a second fluid connection (9) to the first fluid connection (8), wherein the pump (10) is configured as a variable displacement pump which is reversible with regard to the conveying direction of the pump, wherein the pump is designed such that after it has been moved into a second pump position, in which the pump is driven in the first direction of rotation, for retracting the actuating element (11) the pump conveys a pressure fluid in a second conveying direction, opposite the first conveying direction, from the first fluid connection (8) to the second fluid connection (9). The invention further relates to a clutch (3) and to a transmission system having such an actuating device.

Description

Technical field [0001] The present invention relates to a control device / actuator, which is used to control the clutch and / or transmission of a motor vehicle such as a car, a truck, a bus, or an agricultural truck. The control device / actuator has a pump and a The mobile operating element, the pump has two fluid connections, the operating element is fluidly connected to the first fluid connection of the pump, wherein the pump is configured such that in the first pump position, the pump transfers the pressure fluid in the first delivery direction from the second The fluid connection is conveyed toward the first fluid connection for moving the operating element out, and in the first pump position, the pump is driven in a first direction of rotation. The present invention also includes a clutch having such a manipulation device and a transmission assembly (such as a dual-clutch transmission) having such a manipulation device. Background technique [0002] Corresponding operating dev...

AI Technical Summary

Problems solved by technology

Therefore, the energy required for clutch actuation is initially converted into electrical energy at high cost by means of a generator in the drive train or an external pump

Here, large losses arise and all components in the chain must be designed accordingly

[0005] Known electric motor systems therefore have the disadvantage that usually a plurality of electric motors are required and must be controlled

The engine is expensive, requires construction space, and is subject to strong price fluctuations

[0006] The actuation energy is generated hydraulically in known clutches, in which pumps are generally used in principle; however, when using pumps, relatively high power losses often occur in known systems, since the pump is always driving Department

Although this loss can be partly reduced by suction throttling or by-passing, these known systems are usually rather complicated to implement.

As a result, known hydraulic systems can have rather high power losses and complex valve couplings

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