CN217153203U

CN217153203U - Actuator for hydraulic valve and hydraulic valve

Info

Publication number: CN217153203U
Application number: CN202122760369.0U
Authority: CN
Inventors: 奥利弗·圣思特
Original assignee: Eco Holding 1 GmbH
Current assignee: Eco Holding 1 GmbH
Priority date: 2020-11-17
Filing date: 2021-11-11
Publication date: 2022-08-09
Anticipated expiration: 2031-11-11
Also published as: DE202021105422U1

Abstract

The invention relates to an actuator for a hydraulic valve, in particular for a hydraulic directional control valve or a hydraulic pressure control valve of a motor vehicle, having an actuator housing enclosing an electromagnetic coil, and including a pole set disposed in a housing receiving opening of the actuator housing, wherein the pole group comprises at least one pole core and a pole tube, and wherein an axially movable armature is arranged in the interior space of the pole group, and wherein the armature is configured to axially displace a displaceable piston of the hydraulic valve by means of a pin which is mounted in the pole group and is accommodated in the pole group so as to be axially displaceable, and has a through-opening for the throughflow of hydraulic fluid, wherein a damper insert with a cross-shaped cross-section or with a star-shaped cross-section is arranged in the through-opening. The invention also relates to a hydraulic valve comprising a control valve and an actuator for moving the control valve.

Description

Actuator for hydraulic valve and hydraulic valve

Technical Field

The present invention relates to an actuator for a hydraulic valve and to a hydraulic valve, in particular to a hydraulic directional control valve for a motor vehicle or a hydraulic pressure control valve for a motor vehicle.

Background

The use of electromagnetic actuators for axially displacing pistons, for example for axially displacing pistons of hydraulic directional valves or pressure regulating valves, is known. The actuator has an armature which is accommodated in a pole group which is essentially designed as a hollow cylinder in an axially displaceable manner. The armature can thus be moved axially in a cylindrical space enclosed by the pole groups, wherein the space is filled with hydraulic fluid. This space is substantially closed, in other words hydraulic fluid must flow from one side of the armature to the other side of the armature as the armature moves, wherein this results in a pressure loss. This produces a force on the armature opposite to the direction of movement of the armature, which force is velocity dependent and is referred to as damping. In order to be able to control the dynamic stability of the armature movement, the damping must be adjustable. In addition, an undesirably high damping should not occur, since it influences the dynamic behavior and thus the operation of the hydraulic valve. The movement of the armature is transmitted to the piston of the hydraulic valve by means of an axially displaceable pin, wherein the pin is preferably in operative connection with the piston by means of a surface or point contact.

From published german patent application DE102011053033a1, an actuator is known which has a damping element which is fixed in a through-hole which extends completely through the armature in the axial direction, wherein the damping element is embodied in the shape of a disk which has a through-opening which allows through-flow in the region of the through-hole. The damping element is pressed into the through-hole into the armature by means of a web projecting into the through-hole. The pin is embodied in one piece with the piston.

DE102006054941B3 discloses an actuator having a pin which is accommodated in an armature of the actuator, wherein the armature has a damping element in the form of a pressure compensation opening for damping purposes. The pin has an anti-sticking element which is designed to release a pressure compensation opening which is accommodated in the armature.

From the publication DE102009049109a1, an actuator is known which has an anti-sticking element which is embodied in one piece with a pin, wherein the pin and the damping element are made of a foil. For the fixation in the armature, the pin has a clip-shaped element which brings about a firm connection with the armature. The damping element is realized in the form of a pin which can be implemented through-flow.

SUMMERY OF THE UTILITY MODEL

The object of the invention is to provide an actuator which can be produced at low cost and at the same time has a high actuating mass. Another object is to specify a low-cost and easily adjustable hydraulic valve.

The aforementioned object is achieved by the features of embodiment 1 or the features of embodiment 9. The invention is advantageous in terms of design and advantages, as is shown in the further embodiments, the description and the figures.

An actuator for a hydraulic valve, in particular for a hydraulic directional control valve of a motor vehicle or an actuator for a hydraulic pressure control valve of a motor vehicle, having an actuator housing which encloses an electromagnetic coil, is proposed. A magnetic pole group is arranged at the housing receiving opening of the actuator housing, wherein the magnetic pole group comprises at least one pole core and a pole tube. An axially displaceable armature is arranged in the interior of the pole group, which armature is designed as a displaceable piston of an axially displaceable hydraulic valve by means of a pin mounted in the pole group and accommodated in the pole group in an axially displaceable manner, and has a passage opening for the throughflow of hydraulic fluid.

According to the utility model discloses, the attenuator inserts that have cross section or have star cross section is arranged in the break-over opening. By means of such a cross section, the throughflow of the hydraulic fluid can be adapted in a simple manner to the predetermined parameters of the actuator together with the damping.

Preferably, the damper insert is pressed into the through-opening, whereby the armature assembly can be produced in a simple manner.

According to an advantageous embodiment of the invention, a low-cost production is achieved by producing the damper insert from sintered material.

According to an advantageous variant, the pin has at least one anti-disengagement element (Verliersicherung). The anti-disengagement member secures the pin from disengaging after assembly of the actuator. The anti-separation element can be provided in a simple manner, for example, by at least one outer diameter enlargement of the pin.

When the outer diameter enlargement is provided in the region of the recess of the pole group, the installation space of the actuator can be kept small.

According to a further advantageous embodiment of the invention, the actuator has an anti-sticking element. The anti-sticking element hinders the magnetic sticking of the magnetizable armature on the magnetizable pole piece. The attachment prevention element can preferably be configured in the form of a disk and in one piece with the pin or with the damper insert.

The actuator thus advantageously has a simple structure as a whole, which also significantly reduces its manufacturing costs by eliminating manufacturing steps and components.

According to another aspect, the invention also relates to a hydraulic valve comprising a control valve and an actuator moving said control valve, wherein the actuator is constructed according to any one of embodiments 1 to 8. The hydraulic valve advantageously has the advantage of being assigned to an actuator, as a result of which a hydraulic valve which is easy to adjust and which can furthermore be produced at low cost can be realized.

The foregoing description of the solution according to the invention thus includes in particular the various combinations of features defined by the following consecutively numbered embodiments:

1. an actuator (10) for a hydraulic valve (12), in particular an actuator (10) for a hydraulic directional control valve of a motor vehicle or an actuator (10) for a hydraulic pressure control valve of a motor vehicle, having an actuator housing (17) enclosing an electromagnetic coil (16), and comprising a pole group (24) arranged in a housing receiving opening (23) of the actuator housing (17), wherein the pole group (24) comprises at least one pole core (28) and a pole tube (30), and wherein an axially movable armature (40) is arranged in an interior space (36) of the pole group (24), and wherein the armature (40) is designed to axially move a movable piston (15) of the hydraulic valve (12) by means of a pin (48) which is mounted in the pole group (24) and is axially movably received in the pole group (24), and the armature (40) has a through-opening (56) for the throughflow of hydraulic fluid, wherein a damper insert (72) having a cross-shaped cross-section or a star-shaped cross-section is arranged in the through-opening.

2. The actuator (10) according to embodiment 1, wherein the damper insert (72) is pressed into the through-opening (56).

3. The actuator (10) of any preceding embodiment, wherein provision is made for the damper insert (72) to be made of a sintered material.

4. The actuator (10) according to any of the preceding embodiments, wherein the pin (48) has at least one anti-disengagement feature.

5. The actuator (10) of embodiment 4, wherein the pin (48) has at least one outer diameter expansion (74) for preventing disengagement.

6. The actuator (10) according to embodiment 5, wherein provision is made for the outer diameter enlargement (74) to be provided in the region of a recess (80) of the pole group (24).

7. The actuator (10) according to any one of the preceding embodiments, wherein the actuator (10) has an anti-stick element.

8. The actuator (10) according to embodiment 7, wherein the anti-sticking element is configured in a disc shape and is configured integrally with the pin (48) or with the damper insert (72).

9. A hydraulic valve comprising a control valve and an actuator (10) moving the control valve, wherein the actuator (10) is configured according to any one of the preceding embodiments 1 to 8.

Drawings

Other advantages are given by the following description of the figures. Embodiments of the invention are shown in the drawings. The figures, description and embodiments contain many combinations of features. Those skilled in the art can individually review the features and summarize other meaningful combinations in the aggregate.

Fig. 1 shows an exemplary actuator for a hydraulic valve according to the invention in longitudinal section.

Detailed Description

The drawings are only for purposes of illustration and are not to be construed as limiting.

In fig. 1, an actuator 10 of a hydraulic valve 12 is shown in a longitudinal section. Starting from the actuator 10, the hydraulic valve is shown simplified in its components for implementing a hydraulic function, and furthermore comprises a control valve 13 with a housing 14, which has a connection that is not shown. A piston 15 which can be hydraulically flowed through is arranged in the housing 14, is used to open and close the connection and the through-flow opening associated therewith, and is accommodated in the housing 14 so as to be axially displaceable. The piston 15 is axially positioned by means of the actuator 10.

The actuator 10 includes an actuator housing 17 surrounding the electromagnetic coil 16 on an outer periphery 18 of the electromagnetic coil 16 and on at least one end face 20 of the electromagnetic coil 16. The electromagnetic coil 16 is embedded or injected into a carrier 22, the carrier 22 preferably being made of plastic for the sake of electrical insulation. The carrier 22 provided with the electromagnetic coil 16 is received in a housing receiving opening 23 of the actuator housing 17.

The carrier 22 is disposed between the electromagnetic coil 16 and the pole group 24, wherein the carrier at least partially surrounds the pole group 24 by an outer surface 26 of the pole group 24.

The magnetic pole group 24, which is embodied in the form of a hollow cylinder in the present exemplary embodiment, is formed from a pole core 28 and a pole tube 30, which are connected in the axial direction by means of a connecting web 32. The pole core 28, pole tube 30 and connecting webs 32 are formed in one piece. The pole core 28 is arranged facing the piston 15, while the pole tube 30 on the end face of the pole group 24 facing away from the piston 15 is arranged facing away from the piston 15. An end cap 66 closes the actuator housing 17.

The connecting webs 32 are designed as hollow cylinders and are connected to pole cone sections 34 on their side facing the pole core 28. The connecting bar 12 is likewise connected to the pole tube taper 35 of the pole tube 30 on its side facing the pole tube 30. It is also possible to form only one of the

tapers

34, 35. In the interior 36 of the pole group 24 having a longitudinal axis 38, an armature 40 is accommodated so as to be movable in the direction of the longitudinal axis 38.

For the sake of simplicity of assembly, the actuator housing 17 is designed as a hollow cylinder and has, in its region facing the end of the valve piston 15 design, a pole piece 42 which surrounds the pole core 28 and is arranged in the axial direction so as to be supported on the carrier body 22 and on the actuator housing 17. The pole pieces 42 can likewise be pressed into the actuator housing 17.

It is advantageous that the actuator housing 17 can be cap-shaped or in other words can be formed as a pot, and that the carrier 22 carrying the electromagnetic coil 16 can be simply inserted into the actuator housing 17 and the actuator housing 17 can be covered by the pole piece 42 for receiving the pole group 24.

The inner space 36, which can also be referred to as an armature chamber, filled with hydraulic fluid is substantially closed off from the valve piston 15 by means of a bearing washer 44. The bearing washer 44, also called a pole plug, is arranged next to the limit of the axial movement of the armature 40 in order to avoid excessive outflow of the hydraulic fluid contained in the interior space 36. The hydraulic fluid provided for the low-friction displacement of the armature 40 and for the damping of the armature 40 is thereby prevented from being excessively or completely drained by means of the bearing washer 44, although it is possible to pass the hydraulic piston 15 and/or its housing through corresponding displacement gaps.

It should be noted here that, also after the possibly integrated production of the pole group consisting of at least pole tube 30, pole core 28 and connecting webs 32, the bearing washer 44 can be inserted into the pole core 28, thereby further simplifying the production of the bearing point in the bearing washer 44. Furthermore, the one-piece pole group improves the coaxiality of the components.

The piston 15 is designed in operative connection with the armature 40, wherein the piston rests with its end face 46, which is designed to face the armature 40, on a pin 48, which is designed as a cylindrical pin and can be moved axially along the longitudinal axis 38. The pin 48, on its pin face 50 facing away from the piston 15, rests against an unshaped damper insert 72, which is described further below, which is arranged in the through-opening 56 of the armature 40. Thus, the axial movement of the armature 40 can be transmitted to the valve piston 15.

The bearing washer 44 is furthermore provided for the secure support of the pin 48 and for the spatial separation of the magnet part and the hydraulic part of the hydraulic valve 12 and is accommodated in the receiving opening 18, preferably by means of an interference fit and a flush closure with the pole group 24.

The movement of the armature 40 takes place electromagnetically, wherein the electromagnetic coil 16 is designed to apply an electromagnetic field. Energization of the electromagnetic coil 16 causes the piston 15 to move axially, wherein a constraining element, for example in the form of a helical spring, arranged on the other end face of the piston 15 facing away from the end face 46 exerts a constraining force on the piston 15 against which the piston 15 is movable.

In the illustrated position of the armature 40, an annular space 58 is formed in the interior 36 between the armature 40 and the bearing washer 44. This space 58 is connected to a further annular space 62 in the interior 36 in a flow-through manner via the through-opening 56 of the armature 40 and the damper insert 72, wherein the further space 62 is formed on a second armature end face 64 of the armature 40 facing away from the first armature end face 54, between the further armature end face 64 and the interior 36 on the end facing away from the bearing disk 44, and is formed in a limited manner by means of the end cap 66. This means that a pressure balance between the spaces 58, 62 in front of and behind the armature 40 can be achieved at any time. Thus, when moving the piston 15, the armature 40 has to perform only the movement work based on the piston 15 in the direction away from the actuator 10 and thereby have a faster reaction time in order to adjust the piston 15.

The damper insert 72, which is not shown in section in fig. 1, is designed with a cross-shaped cross section or a star-shaped cross section. This means that the damper insert 72 has a plurality of uniformly distributed partitions 76 which are directed radially outward from its longitudinal axis. The partition 76 extends axially in the direction of the longitudinal axis 38 of the actuator 10 and thus forms a fluid channel 78 which is provided for the throughflow of hydraulic fluid between the spaces 58, 62. With such a cross section, the throughflow of the hydraulic fluid together with the damping is adapted in a simple manner to the predetermined parameters of the actuator 10. To this end, the number of said partitions 76 and/or the thickness thereof may vary.

The actuating quality of the actuator 10 and of the valve 12 can thereby likewise be improved.

It is provided that the damper insert 72, which is configured, for example, inexpensively as a sintered component, is advantageously pressed into the through-opening 56, so that a simple production of the armature assembly is possible.

The pin 48 has at least one disengagement prevention element in the form of an outer diameter enlargement 74, which ensures that the pin 48 is free of disengagement after assembly of the actuator 10. As can be seen from fig. 1, the outer diameter enlargement 74 or the two outer diameter enlargements 74 are arranged in the region of the recesses 80 of the pole groups 24, so that the installation space of the actuator 10 can be kept small.

The actuator 10 can likewise have an attachment prevention element, not shown, which prevents the magnetic attachment of the magnetizable armature 40 to the magnetizable pole piece 28 or to the bearing washer 44. The anti-adhesive element can be configured, for example, in the form of a disk and be formed integrally with the pin 48 or with the damper insert 72.

The actuator 10 advantageously has a simple structure as a whole, which also significantly reduces its manufacturing costs by eliminating manufacturing steps and components.

Claims

1. An actuator (10) for a hydraulic valve (12), the hydraulic valve (12) being a hydraulic directional valve or a hydraulic pressure regulating valve for a motor vehicle, the actuator (10) having an actuator housing (17) enclosing an electromagnetic coil (16) and comprising a pole group (24) arranged in a housing receiving opening (23) of the actuator housing (17), wherein the pole group (24) comprises at least one pole core (28) and a pole tube (30), and wherein an axially movable armature (40) is arranged in an interior space (36) of the pole group (24), and wherein the armature (40) is configured to enable an axial movement of a piston (15) of the hydraulic valve (12) by means of a pin (48) which is mounted in the pole group (24) and is axially movably received in the pole group (24), and the armature (40) has a through-opening (56) for the throughflow of hydraulic fluid, characterized in that a damper insert (72) having a cross-shaped cross-section or a star-shaped cross-section is arranged in the through-opening.

2. The actuator (10) of claim 1, wherein the damper insert (72) is pressed into the through opening (56).

3. The actuator (10) of claim 1, wherein the damper insert (72) is made of a sintered material.

4. The actuator (10) of claim 2, wherein the damper insert (72) is made of a sintered material.

5. Actuator (10) according to any of claims 1-4, characterized in that the pin (48) has at least one anti-disengagement member.

6. The actuator (10) of claim 5, wherein the pin (48) has at least one outer diameter expansion (74) for preventing disengagement.

7. The actuator (10) according to claim 6, characterized in that the outer diameter enlargement (74) is provided in the region of a recess (80) of the pole group (24).

8. Actuator (10) according to any of claims 1-4, characterized in that the actuator (10) has an anti-stick element.

9. Actuator (10) according to claim 8, characterized in that the anti-sticking element is configured in a disc-like manner and is configured integrally with the pin (48) or with the damper insert (72).

10. A hydraulic valve having one actuator (10), characterized in that the actuator (10) is constructed according to any one of claims 1 to 9.