WO2016096548A1

WO2016096548A1 - Hydraulic cylinder comprising a measuring device

Info

Publication number: WO2016096548A1
Application number: PCT/EP2015/079046
Authority: WO
Inventors: Leo Caspers; Rene Coppens; Edwin Doedee; Wim ENGELSMAN DEN
Original assignee: Robert Bosch Gmbh
Priority date: 2014-12-15
Filing date: 2015-12-09
Publication date: 2016-06-23
Also published as: DE102014225872A1

Abstract

The invention relates to a hydraulic cylinder having a cylinder housing (2) and a measuring device (18) which has one or more sensors (12, 30, 31). According to the invention, an arrangement of at least one of the sensors is provided on or in the cylinder housing during the production and/or assembly of the hydraulic cylinder.

Description

Hydraulic cylinder with a measuring device

description

The invention relates to a hydraulic cylinder with a measuring device according to the preamble of patent claim 1.

Conventional hydraulic cylinders are known in which one or more sensors have been retrofitted for a measured value detection in order to detect an operating state of the hydraulic cylinder, a component or a component thereof. Because the subsequent

Equipment with sensors in components of the hydraulic cylinder partially only with not

Economic effort is operable, usually the one or more sensors for the sake of simplicity elsewhere in a drive system containing the hydraulic cylinder, arranged, for example, in a pressure medium sink to a temperature of

To measure pressure medium.

This has the disadvantage that the sensor or sensors not at one for the

Measured value recording position are optimal and thus provide no optimal readings.

In contrast, the invention is based on the object to provide a hydraulic cylinder in which a measured value is optimized for an operating state of a hydraulic cylinder.

This object is achieved by a hydraulic cylinder with the features of

Patent claim 1. Advantageous developments of the hydraulic cylinder according to the invention are described in the further subclaims.

A hydraulic cylinder with a cylinder housing contains a measuring device with one or more sensors. According to the invention, an arrangement is at least one of

Sensors are provided on or in the cylinder housing during manufacture and / or assembly of the hydraulic cylinder.

An advantage of the present invention is that the at least one sensor can thus be arranged at an optimum position for determining a respective measured value, which subsequently, ie after completion of the production and / or assembly of the

Hydraulic cylinder, in this simple way is no longer possible. In addition, with the background knowledge of a manufacturer of the hydraulic cylinder, an optimum position for a sensor can be selected very reliably, depending on the measured value to be recorded.

Another advantage is that the inventive arrangement of the at least one sensor in a production and / or assembly of the hydraulic cylinder, which is advantageously already taken into account during a design phase,

cheaper than a costly retrofit.

Advantageously, the cylinder housing has a cylinder tube, and / or a

Piston rod, and / or a cylinder head, and / or a cylinder bottom, and / or a flange, and / or one or more attachment points, in particular one

A pivot pin, or a mounting fork or a joint bearing, wherein one or more of the sensors on or in the cylinder tube, and / or the piston rod, and / or the cylinder head, and / or the cylinder bottom, and / or the flange, and / or one or more of the attachment points is arranged or integrated. Thus, easy accessibility to the sensors is ensured and / or facilitates replacement of individual defective sensors and / or allows replacement of a component with a defective sensor.

Preferably, the flange for easy attachment of the hydraulic cylinder is arranged on the cylinder head or on the cylinder bottom. Advantageously, the cylinder housing has a passage through which a piston rod of the hydraulic cylinder is guided out of the cylinder housing, wherein in the implementation at least one measurement object is arranged, which is associated with at least one of the sensors, and wherein each of the sensors, in particular directly, adjacent to its associated measuring object is arranged. This arrangement according to the invention further contributes to arranging the sensors at an optimum position for the respective measured value detection. In particular, at least one of the sensors is arranged in a radial orientation in the passage or in the cylinder housing.

Advantageously, the flange and / or the cylinder head includes the implementation. This further contributes to making the sensors more accessible and / or replaceable. Advantageously, at least one of the sensors associated with at least one of the measurement objects is arranged in the radial direction in series with its associated measurement object or is arranged offset in the radial direction or in the circumferential direction relative to its associated measurement object. Thus, the sensors are located in a favorable, if not optimal, position with the associated measurement object, which is a prerequisite for providing optimal measurement values. The, in particular in

Circumferential, staggered arrangement of sensors is advantageous in determining a deviation and / or change in a measured value over the space, for example, a side load on the hydraulic cylinder and a consequent bending of the piston rod, or a temperature of a bearing element, wherein a temperature difference is an indicator of can be a page load.

Advantageously, at least one of the measured objects contains a sealing element and / or a bearing element for the piston rod and / or for the passage. The

Operating conditions of sealing elements and bearing elements, in particular independently, to measure and thus to monitor is important for the planning of

Maintenance work, lifetime estimates and / or adjustment of operating parameters related to these elements such as adding additives to one Pressure medium. In particular, one of the measuring objects contains a piston chamber and / or an annular space in order to measure a pressure prevailing therein.

Advantageously, the sensor associated with the bearing element is one

Temperature sensor and / or a force sensor. The temperature of the bearing element, which is determined by the friction, is a measure of wear of the bearing element, because the wear is also determined by the friction and is thus an important indicator of the life of the bearing element and / or the correctness of the bearing operating parameters. The force acting on the bearing is also an important indicator of the life of the bearing element and / or the correctness of the operating parameters relating to the bearing.

Advantageously, between two bearing elements, and / or between two

Sealing elements, and / or disposed between a sealing element and a bearing element, a pressure sensor to measure a pressure prevailing there and / or a pressure difference between the measured objects.

Advantageously, seen in the axial direction, two bearing elements arranged one behind the other in the implementation, wherein the one bearing element of the sensor in the form of a temperature sensor and the other bearing element, the sensor is assigned in the form of a force sensor. In the case of two bearing elements arranged one behind the other, it is quite sufficient to measure the temperature at one bearing element and the bearing load at the other bearing element in order to be able to realistically estimate the two bearing elements with regard to the bearing load and the temperature and the associated wear. This has the further advantage that each sensor element can be saved.

Advantageously, at least one of the sensors in a housing of the

Measuring device arranged and / or is at least one of the sensors with a

Housing connected to the measuring device. If an immediate proximity of one of the sensors to its associated measurement object is not required for obtaining optimal measurement values, the respective sensors can be accommodated in the housing. Advantages of this are that in tight spaces on the hydraulic cylinder more space for other sensors, their proximity to their associated measurement objects for achieving of optimal readings is required and that the sensors housed in the housing are protected from adverse environmental conditions.

The housing may be arranged on the outside of the cylinder tube or separately from the hydraulic cylinder.

Advantageously, the measuring device, in particular the housing, for the measured values acquired by at least one of the sensors contains a data transmission device, and / or a digitizer, and / or a data processing device, and / or a memory device. This is an advantage when evaluating the acquired measured values. In particular, the recorded measured values can be evaluated via a database evaluation.

Advantageously, the measuring device contains a firmware in which rules are stored for a statistical evaluation of the measured values, and / or combinations of the measured values and / or derivatives of the measured values. Based on the rules, it is preferable to judge whether and to what extent the respective hydraulic cylinder is within the

was used as intended.

Depending on the measured values or variables derived therefrom, warning messages can advantageously be output, in particular if the measured values or the variables derived therefrom are an indication that there is no intended use of the hydraulic cylinder.

Advantageously, the warning messages can be logged, in particular stored in a log file, in order, if appropriate, to set out a frequency and / or more precise circumstances of a use that is no longer intended.

In the case of deviations from the intended use, it is advantageously possible to determine an actually intended use by evaluating the measured values recorded, and correspondingly, adjustments to the hydraulic cylinder and / or the operating parameters can be made. In particular, the housing contains at least one sensor interface and / or a user interface. The detected measured values can advantageously be visualized via the user interface and / or a device for visualizing the measured values and / or a device for evaluating the measured values on which a suitable program can be executed can be connected.

Advantageously, the measuring device is designed for battery operation in order to permit a check of the measuring device during a production end control, and / or during storage, and / or during transport and / or decommissioning, without being installed in a system with corresponding auxiliary energy is.

Advantageously, at least one of the sensors is designed as a

Temperature sensor, a force sensor, a strain sensor, a pressure sensor, a

Position / attitude sensor, an acceleration sensor, a GPS sensor, or a

Pressure medium condition sensor, wherein combinations of said sensors are used, for example, a combined temperature / pressure sensor.

In particular, comes for the monitoring of a bearing element, and / or a piston rod seal, and / or an environment of the hydraulic cylinder

Temperature sensor for use, wherein for the monitoring of contact loads in a bearing element and / or side loads of the hydraulic cylinder, a force sensor is used. For monitoring a bearing element and a strain sensor can be used. In particular, a pressure sensor, and / or a temperature sensor, and / or a pressure medium condition sensor can be used for monitoring a pressure medium.

For a monitoring of an operating position of the hydraulic cylinder advantageously a position sensor and / or a position sensor on the piston rod can be used,

for example, when using the hydraulic cylinder in a shovel loader.

For monitoring a side load of the hydraulic cylinder may alternatively or additionally to the force sensor, an acceleration sensor, in particular on the cylinder head or its flange arranged to be used; for example

Accelerometer with six degrees of freedom.

For monitoring an attachment point of the hydraulic cylinder, a force sensor can be used, over which by means of the known force application points also acting moments at the attachment point can be measured.

For monitoring a field of application of the hydraulic cylinder, a GPS sensor, for example with three degrees of freedom, can be used.

An embodiment of a hydraulic cylinder according to the invention is in the

Drawings shown. With reference to the figures of these drawings, the invention will now be explained in more detail. Show it:

Figure 1 in a simplified longitudinal section a front view of a

Hydraulic cylinder according to the invention with a measuring device, and

Figure 2 is an enlarged detail of the hydraulic cylinder shown in Figure 1. The illustrated in Figure 1 hydraulic cylinder 1 has a cylinder housing 2, a

Cylinder tube 4, a cylinder head 6 and a cylinder base 8 contains, where on

Cylinder head 6, a flange 10 is provided.

On the cylinder tube 4 sensors 12 are provided in receptacles designed as pressure sensors, which detect a pressure in a piston chamber 14 and an annular space 16. The sensors 12 are part of a measuring device 18, with which the hydraulic cylinder 1 is equipped.

On the cylinder housing 2, the flange 10 and the cylinder head 6 includes a

Implementation 20, via which a piston rod 22 of the hydraulic cylinder from the

Cylinder housing 2 is guided. In Figure 2, the flange 10 is shown as an enlarged detail of the hydraulic cylinder 1 of Figure 1.

In the feedthrough 20 a plurality of measuring objects 24 are arranged: two

Sealing elements 26 and three bearing elements 28 for the piston rod 22, which in each case

Sensors 12 are assigned. A temperature sensor and / or a force sensor is associated with the one sealing element 26 and the bearing elements 28; a pressure sensor is arranged between the bearing elements 28 arranged one behind the other in the axial direction. Between the sealing elements 26, a pressure sensor is arranged. Every one of them

In addition to the sensors 12 shown, the measuring objects 24 may also have one or more additional sensors 12 (not shown) offset in the circumferential direction.

A trained as a position sensor 30 sensor is integrated into the flange 10 and detects the position and / or position of the piston rod 22nd

The sensors 12 associated with the measuring objects 24 are each arranged in series with their associated measuring objects 24 when viewed in the radial direction. Everyone who

Sensors 12 are arranged directly adjacent to its associated measurement object 24. As measuring objects 24 and the above-described piston chamber 14 and the annular space 16 are to be considered.

Radially offset to its measuring object 24 is a

Dichtungsverschleißsensor 31 disposed in the flange 10, which is designed as a temperature sensor for the sealing element 26.

On the cylinder tube 4 in Figure 1, a housing 32 of the measuring device 18 is provided in which further sensors 12 may be included (not shown in Figure 1 and Figure 2), wherein the housing 32 includes at least one sensor interface and / or a user interface. A device 34 for visualizing or for further processing the measured values can be connected to the user interface.

Disclosed is a hydraulic cylinder with a measuring device, wherein an array of sensors in particular already in a planning and / or design phase taken into consideration. In a production and / or assembly of the hydraulic cylinder, the sensors can be arranged in an economical manner in the hydraulic cylinder. In which

Hydraulic cylinders according to the invention sensors are placed in a cost-effective manner where they provide optimal readings for measured value. Following a manufacturing process and / or assembly process that would not be possible in such economically favorable manner with the same optimized result.

LIST OF REFERENCES

1 hydraulic cylinder

2 cylinder housing

4 cylinder tube

6 cylinder head

8 cylinder bottom

10 flange

12 sensor

14 piston chamber

16 annulus

18 measuring device

20 implementation

22 piston rod

24 measuring object

26 sealing element

28 bearing element

30 position sensor

31 seal wear sensor

32 housing

34 Device for visualizing measured values

Claims

claims

Hydraulic cylinder with a cylinder housing (2) and with a measuring device (18) having one or more sensors (12, 30, 31),

characterized in that

an arrangement of at least one of the sensors (12, 30, 31) on or in the

Cylinder housing (2) is provided during manufacture and / or assembly of the hydraulic cylinder.

Hydraulic cylinder according to claim 1, wherein the cylinder housing (2) a cylinder tube (4), and / or a piston rod (22), and / or a cylinder head (6), and / or a cylinder bottom (8), and / or a flange ( 10), and / or one or more

Having attachment points, wherein one or more of the sensors (30) on or in the cylinder tube (4), and / or the piston rod (22), and / or the cylinder head (6), and / or the cylinder base (8), and / or the flange (10), and / or one or more of the attachment points is integrated.

Hydraulic cylinder according to claim 1 or 2, wherein the cylinder housing (2) has a

Through which a piston rod (22) of the hydraulic cylinder from the cylinder housing (2) is guided, wherein in the passage (20) at least one measuring object (24) is arranged, each of at least one of

Assigned sensors (12, 30, 31), and wherein each of the sensors (12, 30, 31) adjacent to its associated measuring object (24) is arranged.

Hydraulic cylinder according to claim 3, wherein the flange (10) and / or the cylinder head (6) contains the passage (20).

Hydraulic cylinder according to claim 3 or 4, wherein at least one of the at least one of the measured objects (24) associated sensors (12, 30, 31) seen in the radial direction in series with its associated measuring object (24) is arranged or offset in the radial direction or in the circumferential direction is arranged to its associated measurement object (24).

6. Hydraulic cylinder according to one of claims 3 to 5, wherein at least one of

Measuring objects (24) a sealing element (26) and / or a bearing element (28) for the

Having piston rod (22) and / or for the implementation (20). 7. Hydraulic cylinder according to claim 6, wherein the sensor (12) associated with the bearing element (28) is a temperature sensor or a force sensor.

8. Hydraulic cylinder according to one of claims 6 or 7, wherein seen in the axial direction of two bearing elements (28) are arranged one behind the other in the passage (20), wherein the bearing elements (28) of the sensor (12) in the form of a temperature sensor and / or a force sensor is assigned and between the bearing elements (28) of the sensor (12) is associated in the form of a pressure sensor.

9. Hydraulic cylinder according to one of the preceding claims, wherein at least one of the sensors (12, 30, 31) in a housing (32) of the measuring device (18) is arranged and / or at least one of the sensors (12, 30, 31) with a Housing (32) of the measuring device (18) is connected, wherein the housing (32) at least one

Sensor interface and / or a user interface contains. 10. Hydraulic cylinder according to one of the preceding claims, wherein the

Measuring device (18) for the measured values acquired by at least one of the sensors (12, 30, 31), a data transmission device, and / or a

Digitizer, and / or a data processing device, and / or a memory device contains.

1 1. A hydraulic cylinder according to one of the preceding claims, wherein at least one of the sensors (12, 30, 31) as a temperature sensor, a force sensor, a

Strain sensor, a pressure sensor, a position / position sensor, a

Acceleration sensor, a GPS sensor, or a pressure medium condition sensor is formed.