DE1044658B - Hydraulic telemotor control, preferably for hydraulic steering systems - Google Patents

Description

GERMAN

The invention relates to a hydraulic part motor control, as it is preferably used for steering gear to transfer the steering commands from the navigating bridge to the steering room will.

In these systems there is a master pump on the navigating bridge, which can be used, for example, as a radial piston pump can be executed. In the steering gear room there is a telemotor receiver cylinder, which initiates the adjusting movement of the ship's rudder, for example, by the fact that he has the eccentricity the rudder pump adjusted. The telemotor receiver can also attack directly on the rudder and adjust this to certain angle values.

The two cylinder chambers of the Telemotor are connected to the navigating bridge through two pipelines connected to the encoder pump. To fill the working on the principle of the hydraulic linkage System, a high-lying container is used, which is connected to the two via non-return valves Transmission lines is connected. This system has the disadvantage that some trapped in the filling Air can escape very poorly and as a result of the imperfect volumetric filling with Fluid in the transmission of the control movement, severe delays and shifts between the command given on the pump and the executed receiver command.

In order to counteract this deficiency, it has already been suggested that the system should be in the middle position, namely when the rudder sensor is at the rudder angle ± 0, a pre-filling is carried out by the pressure of an auxiliary oil source of the telemotor cables. The. Effect of the compensation device, however, only in the JSTullage has the disadvantage that with rudder commands that are given outside of this position, the Bias is lost and the stability is once again called into question. Elsewhere one has also proposed to use part of the master pump itself as a preload pump. Here, too, is the generation the preload is only possible within a certain angular range. Furthermore the bias must be applied by the hand of the operator, which increases the sensitivity the facility is restricted. The last-mentioned facility also creates the Disadvantage that the bias is lost when the command is given in a certain direction a command in the opposite direction was not issued immediately beforehand. This occurs because through Small leaks in the valve seats can allow some oil to escape and thus without refilling an existing pressure is not maintained.

Hydraulic telemotor control,

preferably for hydraulic

Steering gear

Applicant:

VEB Centex Leipzig

Automatic lathes and hydraulic engineering,

Leipzig N 26, Pittlerstr. 26th

Fritz Berg, Leipzig,
has been named as the inventor

According to the invention, these disadvantages are now avoided in that both transmission lines constantly, d. H. regardless of the angular position of the motor encoder, are connected to the pressure line of an auxiliary pressure oil source, so that they are permanently on a adjustable pressure. This bias allows trapped air to be removed possible and all elements in the system that tend to breathe in a certain way are pretensioned that they do not experience any increase in volume when the control command is transmitted. In this way it is possible, regardless of the angular position of the encoder, to issue control commands very precisely in every position and to be generated without delay, especially when the direction of movement of the telemotor is reversed.

The constant pre-tensioning and the use of an external pressure oil source also achieve that the forces necessary for actuation are not increased even with the highest pretension.

In the figure, such a system is shown using the example of a steering gear control. As it rotates in one direction, the master pump 1 pumps the oil in line 3 into space 5 of the telemotor 2, which shifts as a result, displacing oil into line 4 from space 6 and feeds it back to the master pump. This creates a closed cycle. If the direction of rotation of the master pump 1 is reversed, it conveys via line 4 into the telemotor space 6 and the oil displaced from space 5 flows back to the master pump through line 3.

The constant pre-tensioning as well as the initial filling of the system is carried out by an additional one

.809 679/475

Pump or other pressure oil source 7 via line 8 and check valves 9 and 10 into the lines 3 and 4. With the help of a valve 11, the preload pressure is set, which varies as required can be and must be as high as possible from the point of view of the stability of the control system. When the encoder pump is turned and a control command is issued, the non-return valve closes, in the line of which the master pump conveys pressure oil, for example when there is pressure in line 3 Valve 9 and, when there is pressure in line 4, valve 10. In this way, the displacement on the part of the motor piston corresponds always the amount of liquid delivered by the sender pump or a certain amount Angle of rotation of the encoder pump shaft.

Claims (3)

Patent claims: 1. Hydraulic partial motor control, preferably for ship rudder controls that are used for transmission travel-dependent positioning movements from a master pump and a piston telemotor or rotating telemotor receiver, characterized in that for permanent bias and to completely fill the telemotor cables (3 and 4) these telemotor cables Via a check valve (9 and 10) each with * the pressure line (8) of an auxiliary sdruckölquelle (7) are connected. 2. Hydraulic Teiemotorensteuerung according to claim 1, characterized in that the Auxiliary pressure oil source (7) is a zero stroke pump with automatic flow rate regulation and Conveys just as much oil as is necessary to maintain the preload pressure. 3. Hydraulic Teiemotorensteuerung according to claim 1, characterized in that the Auxiliary pressure oil source (7) is a hydraulic accumulator. Considered publications:
German Patent No. 961,947;
U.S. Patent No. 2,615,305. 1 sheet of drawings © 809 679/475 11.5 &