EP4234950A1 - Hydraulic system with mechanically controllable functional element, method for operating a hydraulic system, and use of a mechanical sensor - Google Patents

Abstract

The invention relates to a hydraulic system (1), having at least one conveyor (2) and a hydraulic consumer (3), characterized by a mechanical sensor (5) for detecting at least one working direction of the conveyor (2), the sensor (5) is operatively connected to a functional element (6) of the hydraulic system (1) in such a way that the functional element (6) can be actuated mechanically as a function of a detection by the sensing means (5).

Description

The invention relates to a hydraulic system. Furthermore, a method for operating a hydraulic system and the use of a mechanical sensing means are specified.

Corresponding hydraulic systems generally have at least one delivery device, such as a (hydraulic) pump, and a hydraulic consumer, such as a (hydraulic) cylinder. Hydraulic functions (usually implemented with valves) are actuated either hydraulically, electrically or mechanically in both open and closed hydraulic systems.

If you want to activate a function depending on the direction of rotation of the pump, an electrical signal from a controller or hydraulic logic is used today to trigger the function.

A disadvantage of hydraulic actuation is that it usually involves a delay in the build-up of pressure. Furthermore, undefined switching states (depending on the pressure) can usually occur. In addition, the actuation is regularly dependent on the hydraulic system and external loads/influences.

In the case of electrical actuation, it is disadvantageous that this generally requires electrical control, which increases the production costs. Furthermore, cabling that takes up installation space is usually necessary.

Proceeding from this, an object of the invention can be seen as solving at least partially the problems described with reference to the prior art. In particular, it should be possible to implement a direct switching of the function with as little delay as possible. In particular, external influences (environment/incorrect operation/programming) should have as little influence as possible on switching the function. Advantageously, one Direction of rotation evaluation and / or actuation are made possible directly on the component or the component.

These objects are each solved with the features of the independent claims. Advantageous developments are specified in the dependent claims. The features listed in the dependent claims can be combined with one another and lead to further design variants. The description, particularly in connection with the figures, explains the invention and specifies further preferred configurations of the invention.

A hydraulic system contributes to this, having at least one delivery device and a hydraulic consumer, further having a mechanical sensor for detecting at least one working direction of the delivery device, wherein the sensor is operatively connected to a functional element of the hydraulic system in such a way that the functional element depending on a detection of the Sensing means is mechanically actuated.

The hydraulic system can be an autonomous hydraulic system. The hydraulic system can be an open or a closed hydraulic system. For example, the delivery device and the hydraulic consumer can be connected to one another via a hydraulic circuit. In this context, the functional element can be a functional element of the hydraulic circuit, for example. The working direction can include a direction of rotation and/or a conveying direction of the conveying device.

For example, the functional element can be actuated mechanically (directly or indirectly by the sensing means) as a function of a working direction of the conveying device that is mechanically detected by the sensing means. The mechanical sensing means can, for example, bring about a mechanical coupling between the conveying device and the functional element. The functional element can, for example, control, in particular establish or interrupt, a fluidic connection between the consumer and a hydraulic accumulator.

According to an advantageous embodiment, it is proposed that the sensing means, depending on the working direction, require a mechanical actuation of the Functional element triggers. In an advantageous manner, a hydraulic function can be mechanically coupled to the working direction of the conveying device by means of the sensing means.

According to a further advantageous embodiment, it is proposed that the delivery device includes a pump and the sensing means detects at least one direction of rotation of the pump. A mechanical coupling of a hydraulic function to the direction of rotation of a pump can be effected in an advantageous manner by means of the sensing means.

According to a further advantageous embodiment, it is proposed that the functional element includes at least one (mechanically controllable) valve. The valve can, for example, control, in particular establish or interrupt, a fluidic connection between the consumer and a hydraulic accumulator. The valve can be, for example, a (mechanically) controllable, such as (mechanically) unlockable check valve or switching valve.

According to a further advantageous embodiment, it is proposed that the consumer includes at least one hydraulic cylinder. The hydraulic cylinder can be a differential cylinder, for example.

According to a further advantageous embodiment, it is proposed that the sensing means comprises at least one mechanical pick-up. For example, a shaft of the conveying device can be connected (rotatably fixed) to a mechanical driver. Depending on the direction of rotation of the shaft, the driver can take along the at least one mechanical pickup of the sensing means. For this purpose, depending on the direction of rotation of the shaft, a form fit between driver and collector can occur.

According to a further advantageous embodiment, it is proposed that the sensing means be mechanically coupled to the functional element. For example, the sensing means can be connected to the functional element in a fixed manner or via a mechanical transmission, such as a mechanical gear.

1. a) Fördern von Hydraulikflüssigkeit mittels einer Fördereinrichtung des hydraulischen Systems,
2. b) Erfassen mindestens einer Arbeitsrichtung der Fördereinrichtung mittels eines mechanischen Sensiermittels,
3. c) Mechanisches Betätigen eines Funktionselements des hydraulischen Systems, in Abhängigkeit der erfassten Arbeitsrichtung.

According to a further aspect, a method for operating a hydraulic system is specified, comprising at least the following steps:

1. a) delivery of hydraulic fluid by means of a delivery device of the hydraulic system,
2. b) detection of at least one working direction of the conveying device by means of a mechanical sensor,
3. c) Mechanical actuation of a functional element of the hydraulic system, depending on the detected working direction.

The specified sequence of steps a), b) and c) is basically an example. To carry out the method, steps a), b) and c) can be carried out at least once in the order given. In addition, steps a), b) and c), in particular steps a) and b), can be carried out at least partially in parallel or simultaneously.

For example, the method for operating a hydraulic system described here can be carried out.

In particular, depending on the direction of rotation of a pump, in which the pump shaft can preferably be connected to a mechanical pickup, the mechanical pickup can be actuated by the rotational movement of the pump, the movement of which can trigger a hydraulic function.

According to a further aspect, the use of a mechanical sensor means for detecting at least one working direction of a conveying device of a hydraulic system in order to actuate a functional element of the hydraulic system depending on the working direction is specified.

The details, features and advantageous configurations discussed in connection with the system can accordingly also occur in the method and/or use presented here and vice versa. In this respect, full reference is made to the statements there for a more detailed characterization of the features.

Fig. 1:

ein erstes Beispiel eines Hydraulikkreislaufs,

Fig. 2:

ein zweites Beispiel eines Hydraulikkreislaufs,

Fig. 3:

einen beispielhaften Aufbau eines hier beschriebenen, hydraulischen Systems, und

Fig. 4:

ein beispielhaftes Ablaufdiagramm eines hier beschriebenen Verfahrens.

The solution presented here and its technical environment are explained in more detail below with reference to the figures. It should be pointed out that the invention is not limited by the exemplary embodiments shown should. In particular, unless explicitly stated otherwise, it is also possible to extract partial aspects of the facts explained in the figures and to combine them with other components and/or findings from other figures and/or the present description. They show schematically:

Figure 1:

a first example of a hydraulic circuit,

Figure 2:

a second example of a hydraulic circuit,

Figure 3:

an exemplary structure of a hydraulic system described here, and

Figure 4:

an exemplary flowchart of a method described here.

Figures 1 and 2 show examples of hydraulic circuits 4. The figures show application examples for a closed hydraulic circuit 4 with a differential cylinder as consumer 3 or hydraulic cylinder 9. For this purpose, the connection to the reservoir 11 is opened or closed depending on the direction of rotation of the pump (this results in the retraction or extension movement of the cylinder).

In figure 1 a conventional hydraulic actuation of a functional element 6 is shown in this context. A releasable check valve 12 opens in the retracting direction of the cylinder after the pressure has built up in the rod side of the hydraulic cylinder 9. The open position is not defined and depends on the pressure.

In figure 2 a conventional electrical actuation of a functional element 6 is shown in this context. The connection to the memory 11 is controlled via an electric switching valve 13. It is controlled externally via an electrical signal from a controller (not shown here).

3 shows schematically an exemplary structure of a hydraulic system 1 described here. The hydraulic system 1 has at least one conveyor 2 and a hydraulic consumer 3, the are connected to one another, for example via a hydraulic circuit 4 . Furthermore, the hydraulic system 1 has a mechanical sensor 5 for detecting at least one working direction of the conveying device 2, with the sensor 5 being operatively connected to a functional element 6 of the hydraulic circuit 4 in such a way that the functional element 6 can be actuated mechanically depending on a detection by the sensor 5.

The sensing means 5 can trigger a mechanical actuation of the functional element 6 depending on the working direction. The delivery device 2 can include a pump 7 and the sensing means 5 can detect at least one direction of rotation of the pump 7 . The functional element 6 can include at least one valve 8 . The consumer 3 can include at least one hydraulic cylinder 9 .

By way of example, the sensing means 5 can comprise at least one mechanical pick-up 10, which is only indicated schematically here. The sensing means 5 can be coupled mechanically to the functional element 6 .

For example, the pump shaft can interact with one or two mechanical pickups 10 (not shown here), which work depending on the direction of rotation (example bicycle freewheel). The respective mechanical pickup 10 is in particular only actuated when the pump shaft rotates in a defined direction. The consumers 10 can in turn be rigidly mechanically connected to an actuating unit of the functional element 6, which converts the mechanical movement into a hydraulic function.

The functional element 6 can thus advantageously be actuated (purely) mechanically here. Since the hydraulic actuation of the pilot operated check valve (cf. 1 ) or the electic actuation of the switching valve (cf. 2 ) is directly dependent on the direction of rotation of the pump 7, it is particularly advantageous to mechanically couple the valve position (as presented here) to the direction of rotation. For example, a pickup 10 can be provided on the motor or pump shaft, which triggers a mechanical movement depending on the direction of rotation. The movement can be rigidly passed on to a component, such as the functional element 6 (e.g. valve), which converts the mechanical movement into a hydraulic function.

4 schematically shows an exemplary flowchart of a method described here. The method is used to operate a hydraulic system 1. The order of steps a), b) and c) shown in blocks 110, 120 and 130 is exemplary and can be run through at least once in the order shown. Steps a), b) and c) can be carried out at least partially in parallel or simultaneously.

In block 110, according to step a), hydraulic fluid is conveyed by means of a conveying device 2 of the hydraulic system 1. In block 120, according to step b), at least one working direction of the conveying device 2 is detected by means of a mechanical sensing means 5. In block 130, according to step c ) A mechanical actuation of a functional element 6 of the hydraulic system 1, depending on the sensed working direction.

The method can be used to operate a hydraulic system described here (cf. 3 ) be performed.

This also describes the use of a mechanical sensor means 5 for detecting at least one working direction of a conveying device 2 of a hydraulic system 1 in order to actuate a functional element 6 of the hydraulic system 1 depending on the working direction.

The system described can advantageously contribute to providing a hydraulic system that is as self-sufficient as possible. Furthermore, a hydraulic function that is as direct as possible and dependent on the direction of rotation can be provided in a particularly advantageous manner. The system can advantageously be provided as safety technology or contribute to increasing operational safety. For example, the opening of a valve can only be ensured when the pump rotates.

Reference List

1

system

2

conveyor

3

consumer

4

hydraulic circuit

5

sensing means

6

functional element

7

pump

8th

Valve

9

hydraulic cylinder

10

customer

11

Storage

12

check valve

13

switching valve

Claims (10)

Hydraulic system (1), having at least one delivery device (2) and a hydraulic consumer (3), characterized by a mechanical sensor (5) for detecting at least one working direction of the delivery device (2), the sensor (5) thus having a functional element (6) of the hydraulic system (1) is operatively connected in that the functional element (6) can be actuated mechanically as a function of a detection by the sensing means (5). Hydraulic system (1) according to Claim 1, in which the sensing means (5) triggers mechanical actuation of the functional element (6) as a function of the working direction. Hydraulic system (1) according to claim 1 or 2, wherein the delivery device (2) comprises a pump (7) and the sensing means (5) detects at least one direction of rotation of the pump (7). Hydraulic system (1) according to any one of the preceding claims, wherein the functional element (6) comprises at least one valve (8). Hydraulic system (1) according to one of the preceding claims, wherein the consumer (3) comprises at least one hydraulic cylinder (9). Hydraulic system (1) according to one of the preceding claims, wherein the sensing means (5) comprises at least one mechanical pickup (10). Hydraulic system (1) according to one of the preceding claims, wherein the sensing means (5) is mechanically coupled to the functional element (6). Method for operating a hydraulic system (1), comprising at least the following steps: a) delivery of hydraulic fluid by means of a delivery device (2) of the hydraulic system (1), b) detecting at least one working direction of the conveying device (2) by means of a mechanical sensing means (5), c) Mechanical actuation of a functional element (6) of the hydraulic system (1), depending on the detected working direction. Method according to Claim 8, in which the method for operating a hydraulic system (1) according to one of Claims 1 to 7 is carried out. Use of a mechanical sensor (5) for detecting at least one working direction of a conveying device (2) of a hydraulic system (1) in order to actuate a functional element (6) of the hydraulic system (1) depending on the working direction.

Images