DE102015120984A1 - Hydraulic valve, in particular hydraulic transmission valve - Google Patents

Abstract

The invention relates to a hydraulic valve (1), in particular a hydraulic transmission valve, comprising a solenoid part (3) with a magnetizable housing (4) which encloses a magnet coil (7) on an outer circumference (50) and on at least one first end face (52) , and with a pole tube (6) arranged in the interior of the magnet coil (7), in which an armature (10) in an armature space (56) is axially displaceable, and a hydraulic part (2) with a hydraulic piston (16), which axially slidably guided in a valve bushing (5) and by means of which at least one working port (A) optionally with at least one supply port (P) and at least one tank port (T) is connectable. In this case, the armature (10) for driving the hydraulic piston (16) is provided. The valve bush (5) is arranged along a longitudinal axis (L) in extension of the pole tube (6). In this case, a hydraulic fluid reservoir (150) is provided in a bobbin (8) which is in fluid communication with the armature space (56).

Description

Technical area

The invention relates to a hydraulic valve, in particular a hydraulic transmission valve of a hydraulic fluid-carrying device, in particular the mechatronics of a hydraulic control of a transmission of a motor vehicle.

State of the art

In order to nevertheless be fail-safe in the case of large gear oil change intervals, in extreme cases with so-called lifetime fillings, the gear valve must have a high degree of robustness. High robustness can indeed be achieved with a great play on the parts to be moved. However, this is at the expense of the control quality.

From the DE 10 2011 053 023 A1 a hydraulic valve is known which has both a high degree of robustness and a high control quality. The high robustness is achieved by dirt particles in the operating medium can not get stuck to jamming of the transmission valve, since the anchor can muster so high axial forces that it can always break loose. The high control quality is achieved by means of a plurality of constructive measures, which in particular minimizes the transverse forces between the armature and a pole tube, in which the armature is movably arranged.

Such a known constructive feature for reducing the transverse forces is there a very close running clearance between the armature and the pole tube. In order to achieve high magnetic forces, the aim is to achieve the thinnest possible separating layer, for example, instead of a sleeve or a thick coating. Such a very thin separation layer is usefully at a layer thickness of 10 .mu.m to 60 .mu.m. The thin separating layer can be achieved, for example, by chemical or galvanic deposition of the separating layer. As a chemical method, for example, chemical nickel plating can be used. Here, a layer thickness of 45 microns has proved to be favorable, since a high magnetic force is achieved at acceptable shear forces here. With the existing existing methods, a layer thickness of 20 μm and above has proven to be sufficiently reproducible. In contrast to, for example, galvanic nickel plating, in the chemical process no electrical voltage is applied across electrodes. The layer thickness is very homogeneous in chemical nickel plating.

To produce a proportional behavior of the transmission valve is in the DE 10 2011 053 023 A1 a Polkernkonus provided. With such a Polkernkonus but also different other force / displacement curves are feasible. However, the linear force / displacement curve is mostly desired to simplify the control.

Disclosure of the invention

An object of the invention is to provide a hydraulic valve, in particular as a hydraulic transmission valve, which combines the highest possible robustness with cost-effective design.

The above object is achieved according to one aspect of the invention with the features of the independent claim.

Favorable embodiments and advantages of the invention will become apparent from the further claims, the description and the drawings.

It is proposed a hydraulic valve, in particular a hydraulic transmission valve, comprising a solenoid part with a magnetizable housing, which encloses a magnetic coil on an outer circumference and at least a first end side, as well as with a arranged inside the magnet coil pole tube, in which an armature in an armature space is provided axially displaceable, and a hydraulic part with a hydraulic piston, which is guided axially displaceably in a valve bush and by means of which at least one working port optionally with at least one supply connection and at least one tank connection is connectable. The armature is provided for driving the hydraulic piston. The valve sleeve is arranged along a longitudinal axis in extension of the pole tube. In this case, a hydraulic fluid reservoir is provided in a bobbin, which is in fluid communication with the armature space. The pole tube comprises a pole and / or a pole core of the solenoid part.

In the hydraulic valve according to the invention, a hydraulic fluid reservoir is provided in the bobbin, which is in communication with the armature space. The bobbin as a carrier of the magnetic coil thereby engages around the magnetic coil and also serves to receive the pole tube in the interior of the bobbin and thus also the magnetic coil. In some cases, it is also useful to inject the pole tube in the coil carrier with. Conveniently, the bobbin can be made by means of a plastic injection molding process. Alternatively, the hydraulic fluid reservoir may be provided in the housing. The reservoir, which can be conveniently filled once initial, for example, in a production-side test stands with the armature space in hydraulic fluid connection and can advantageously an air inlet, even with fluctuating fluid level in the hydraulic valve prevent. Holes in the bobbin make this a fluid connection between the hydraulic fluid reservoir and the armature space ago. A channel inside the armature can further direct the hydraulic fluid into a front part of the armature space facing the hydraulic piston. From the front armature space, the hydraulic fluid passes into a region of a pin, which is guided in the hydraulic bush and serves for the axial force transmission between the armature and the hydraulic piston. Thus, the hydraulic fluid is in fluid communication between the hydraulic fluid reservoir and the volume in which the pin is moving.

The hydraulic fluid reservoir is provided as a cavity in the bobbin and is thus to produce cost-neutral without additional tools. The reservoir can be sealed with a cover as a sealing disk on the side facing away from the armature space. The reservoir can also prevent the entry of possibly resulting from abrasion chips in the anchor space. Furthermore, the ability to displace the hydraulic fluid into the reservoir prevents additional undesirable damping. The reservoir may be favorably dimensioned such that the volume displacement effected by the stroke of the pin between the armature and the hydraulic piston is for example 10% of the reservoir volume. In this way, only hydraulic fluid from the armature space is pushed into the reservoir and sucked in from there. This reduces the dirt entry into the armature space. The hydraulic reservoir may advantageously be provided with a cover, or designed to be designed so that it is covered upwards, so that the hydraulic reservoir sucks or is filled via Eck or a labyrinth hydraulic fluid. This reduces a dirt entry into the hydraulic reservoir and thus into the armature space. Advantageously, the hydraulic reservoir is also arranged at the end of the solenoid part, which faces away from the hydraulic part, so that due to the prevailing there lower flow of hydraulic fluid less dirt can be whirled up and registered in the armature space.

According to an advantageous embodiment, an axial force transmission between the armature and hydraulic piston can be effected by means of a separately formed pins, wherein the pin can be provided in particular guided in the valve sleeve. Advantageously, the pin can be made in particular of non-magnetic material. Such a power transmission between armature and hydraulic piston allows a mechanical decoupling between the bearing of the armature and the bearing of the hydraulic piston. In this way it is possible that only axial forces are transmitted between the two components. Transverse forces on the armature and / or hydraulic piston are thereby advantageously reduced, whereby the friction of the run of armature and / or hydraulic piston can be reduced. Also, a separation of the power transmission between armature and hydraulic piston via a separate component, as it represents the pin, a more favorable tolerance design of pole tube and valve sleeve possible because both recesses in which run armature and hydraulic piston, are separated in this way. The pin can advantageously be designed symmetrically with respect to a transverse plane in order to facilitate assembly, since it is not necessary to pay attention to the orientation of the installation position. A favorable diameter of the pin may be, for example, 2.0 mm to 2.5 mm.

According to an advantageous embodiment may be provided in the normal operation by a stroke volume of the pins effected volume exchange of the hydraulic fluid with the hydraulic fluid reservoir. During operation of the hydraulic valve, the stroke volume between armature and hydraulic piston will be temporarily changed during a movement of the pin, causing a displacement of the volume of the hydraulic fluid in this area. The hydraulic fluid volume in the guide area of the pin can increase and decrease in operation. Due to the hydraulic connection between the hydraulic fluid reservoir and the stroke volume of the pin, the hydraulic fluid can be pushed back and forth. If the capacity of the hydraulic fluid reservoir is large enough, the reservoir will suffice to replenish the stroke volume of the pin, even with smaller hydraulic leaks of the pin. Thus, an exchange of the hydraulic fluid of the stroke volume of the pin is reduced with the hydraulic environment of the hydraulic valve and thus reduces the risk that potentially harmful abrasion can get into the area of the pin or the hydraulic piston. The connection of the hydraulic reservoir with the hydraulic fluid of the environment can be done over corner or over a labyrinth, whereby a dirt entry into the hydraulic reservoir and thus into the armature space can be reduced.

According to an advantageous embodiment, a capacity of the hydraulic fluid reservoir can be a multiple, for example ten times, the stroke volume of the pin. The replacement of the hydraulic fluid with the hydraulic environment of the hydraulic valve can be reduced if the capacity of the hydraulic fluid reservoir is in the range of ten times the stroke volume of the pin. In this area, the reservoir is sufficient to compensate even minor hydraulic leaks to the hydraulic environment by guiding gaps of the moving parts of the hydraulic valve such as pin and hydraulic piston and thus to reduce the exchange. The bottom of the hydraulic reservoir can expediently in a proper installation position significantly deeper be arranged as the lower walls of the connecting holes in the armature space, whereby a dirt entry into the armature space can be reduced, since possibly located in the hydraulic fluid dirt sinks and can settle at the bottom of the hydraulic reservoir.

Preferably, a chip protection cover may be provided, wherein a part of the hydraulic reservoir is integrated in the chip protection cover and / or the chip protection cover serves as a cover for the hydraulic reservoir. Alternatively, the hydraulic valve may have a chip protection cover, which covers the pole disk with ribs and / or forms a cover or a labyrinth over a suction point of the hydraulic reservoir. The chip protection cover can prevent metallic chips, for example by abrasion and residual dirt from the production or by friction of the moving parts in the transmission and the hydraulic valves in operation, can cause a short circuit between the terminals of the solenoid. For this purpose, the chip protection cover can be pushed as Spanschutzkappe on the bobbin or formed by molding the bobbin with the fork plug. Further, the chip protection cover can serve as a support of the plug force when mounting a mating connector on the fork plug. Furthermore, the chip protection cover can form a cover or a labyrinth for a suction point of the hydraulic reservoir, so that the suction point is covered upwards and hydraulic fluid is sucked or filled over the corner or over the labyrinth and thus a dirt entry into the hydraulic reservoir and thus into is reduced with this associated anchor space.

According to an advantageous embodiment, the pin may have on its circumference a recess for reducing its longitudinal bearing surface, in particular the recess may be circumferentially formed as an annular groove on the circumference. However, other forms of the recess, in particular interrupted or angular recesses, are conceivable. Such a recess reduces the possible bearing surface of the pin in the valve sleeve and thus contributes to a reduction of the friction in an axial movement of the pin. The length and depth of the recess can be designed depending on the tolerance situation and the required guide length of the pin and of a stroke of the armature and the hydraulic piston. If the recess is advantageously designed as an annular groove, the pin can be manufactured as a simple turned part. Further, the recess with respect to the axial arrangement on the pin can be designed symmetrically to the longitudinal center of the pin and thus be independent of a mounting position in the hydraulic valve. The pin can be inserted first when assembling with the front or back side.

According to an advantageous embodiment, a pole disk and / or a fork plug can be provided integrated into a bobbin. The pole disc serves as a magnetic closure of the magnetizable housing, which encloses the magnetic coil on an outer circumference and on at least one end side, on the side facing away from the hydraulic piston end face of the magnetic coil. The pole disk can be designed, for example, as a magnetizable disc-shaped or annular body with recesses for cable feedthroughs, wherein the recesses can be bores, for example. The pole disk may in particular be designed symmetrically in order to obtain a favorable symmetrical magnetic circuit. This Polscheibe can be advantageously integrated into the bobbin, for example, be encapsulated with the plastic material of the bobbin when the solenoid is to be executed with the bobbin overmolded. Recesses in the pole disk can be suitably injected to fill it. Thus, the pole disk can be molded together with the magnetic coil in an injection molding process. In this way, the axial space can be reduced favorably. Also hereby a particularly compact design is possible. In addition, eliminates a separate assembly step for the pole piece. Also, so the tolerance situation can be shifted to uncritical outer diameter, since the pole disk can be aligned so low to the solenoid and the pole tube.

A fork plug as an electrical connection of the magnetic coil may conveniently also be integrated into the bobbin by encapsulation. In this way, a stable mechanical connection of the fork plug is ensured with the solenoid part. In addition, at the same time a good electrical insulation can be achieved by encapsulation, so that essential parts of the fork plug, which are not covered by a plug, can be formed safe to touch.

According to an advantageous embodiment, the housing may be caulked on the pole disk or welded to the pole disk. The housing is pushed during assembly over an outer periphery of the pole disk and is fixed for example on the pole disk via a press-fit. For additional attachment of the housing on the pole disk beyond a caulking of the housing can be effected via suitable Verstemmungssegmente which are scraped off by means of a suitable tool from the housing and / or bent and pressed onto the pole disk. As a result, a purely axial caulking of the housing on the pole piece to reach, so that possibly acting in a caulking shear forces are reduced. Such caulking provides additional protection of the attachment of the housing and Polscheibe. Alternatively or additionally, it is conceivable that the housing is provided welded to the pole plate. For example, the pole disk can be subsequently provided in the axial direction on the housing and in this way can be welded flush with the housing on an outer side.

According to an advantageous embodiment, a coil wire of the magnetic coil may be provided wound around a pin of the fork plug. In this case, a welding sleeve can be inserted over the pin of the fork plug and the coil wire, which is then electrically and mechanically connected by means of pressing and a suitable welding process such as resistance welding with the pin and the wire. In this way, a robust and reliable connection is provided, which can reach a long life even under harsh operating conditions.

According to an advantageous embodiment, the bobbin in the armature space protruding projections may have as a stop for the anchor. For this purpose, the projections may be arranged on an armature on the side facing away from the hydraulic piston end face and project into the armature space. These projections can advantageously form the stop for the armature, so that the armature does not impinge flatly with its end face on the bobbin and rests. Due to the reduced contact surface of the armature on the bobbin as an anticaking effect can be achieved so low that the anchor when it stops against the bobbin does not stick to it, but can easily solve it again.

According to an advantageous embodiment, the armature can be provided biased by a spring in the direction of the hydraulic part and pressed to guide the spring, a spring plate in a recess of the armature. The spring plate can be provided by deep drawing formed from sheet metal and having a circumferential radial projection as a stop and Antiklebescheibe. The spring plate made of sheet metal can be made thin-walled and yet stiff in this way. A damping diaphragm can additionally be designed by an inner diameter, wherein the damping diaphragm can be as open as possible in order to achieve an effective damping. Due to the elastic design a secure pressing into the anchor is possible. By providing a radius as an insertion beforehand also a chip-free pressing can be ensured. Advantageously, the spring plate is formed of non-magnetic material.

According to an advantageous embodiment, the pole tube may have in a arranged in its outer circumference incision, preferably a V-shaped incision, a radially circumferential recess as a fine control contour. The recess may be formed, for example, as a circumferential annular groove. A favorable groove depth is in the range of 0.1 mm. The incision advantageously serves to focus the magnetic field lines of the magnetic coil in the direction of a region of the armature on the part of the armature facing the hydraulic piston. Due to the circumferential recess in the region of the incision, an additional favorable focus can be made in the direction of the armature, which can achieve a magnetic force gain and thus serve for fine control in the control / regulation of the armature. This is achieved particularly advantageously by the V-shape of the incision. This ensures a particularly efficient operating behavior of the hydraulic valve. Through the recess, a remaining wall thickness of the pole tube in the region of the incision can be additionally reduced with otherwise the same strength of the pole tube. In this way, effects of the magnetic field focused in the incision in the incision, as might occur, for example, due to a parasitic magnetic flux, can be reduced and the magnetic force in this region increased. As a result, the control behavior of the solenoid part can be further improved favorably at substantially constant strength of the pole tube against mechanical deformation due to external forces during manufacture and during operation of the hydraulic valve.

Advantageously, the pole tube on an outer surface in a longitudinal region between the first end face and one of these opposite the second end face of the magnetic coil having the annular circumferential recess. In order to be able to take advantage of the effect of focusing the magnetic field generated by the magnetic coil, it is expedient to arrange the incision on a part of the pole tube, which is located in the region between the two end faces of the magnet coil when mounted as intended. Thus, the effect can be exploited most favorably and used advantageously for a control of the armature.

The incision may favorably have on its opposite side flanks a first conical contour and a second conical contour arranged opposite to a plane perpendicular to the longitudinal direction, the conical contours being able to be open towards the outer surface. Such a conical design permits favorable focusing of the cone Magnetic field generated by the magnetic coil. Further, the mechanical stability of the pole tube can thereby be obtained in a favorable manner, so that the hydraulic valve can be controlled favorably over a wide range of mechanical and thermal stress. The slope of the conical contours may be formed differently steep, whereby a characteristic of the magnetic characteristic can be influenced.

Suitably, the first and the second cone-shaped contour may be connected by a connecting web, wherein a wall thickness of the connecting web may be less than a wall thickness of the pole tube. In particular, the wall thickness in the region of the connecting web can be substantially lower than the continuous wall thickness of the pole tube. Thus, wall thicknesses of the connecting web may typically be in the range of 0.2 to 0.3 mm, so that a magnetic effect of the pole tube in the region of the incision is almost completely interrupted. A possible thin connecting web has proven to be advantageous for the focusing of the magnetic field, so as to achieve a favorable controllability of the magnetic part.

Further, the incision on an inner surface of the pole tube may have at least one circumferential recess, wherein in particular the at least one recess may be arranged in the region of the connecting web. Due to the arrangement of at least one circumferential recess, which may be formed, for example, as a circumferential annular groove on the inner surface of the pole tube, the hydraulic valve according to the invention has the additional advantage of reducing the transverse magnetic forces in the region of the relief shoulder to minimize the magnetosuppression and thus the valve hysteresis. The recess in the incision may be arranged laterally in the connecting web at the transition to the conical side edge. Advantageously, this side edge may be steeper than the opposite side edge of the incision.

Further advantages that result from a concept of the punctures on the inner surface of the pole tube, on the one hand, an increase in the robustness of the solenoid part / valve against forces introduced in the production of individual parts. Furthermore, the connecting web can be mechanically relieved at the pole hat, since the armature runs directly on only a part of the connecting web. A functional influence of the magnet due to plastic deformation of the thin-walled connecting web during the production of the Polhuts is reduced, such as deformations by torsion or elastic displacement of the wall during the pre-and finish processing of the pole tube, due to the wall thickness differences.

Another advantage is an increase in the robustness of the magnet / valve against thermal influences / forces during operation. The connecting bridge is mechanically relieved. Thus, a functional influence of the magnet due to thermal deformation and different thermal expansions of the sensitive, thin-walled connecting web is avoided.

Advantageously, the circumferential recess and the at least one groove on the pole tube can be arranged axially spaced. Such a spatial separation in the axial direction proves to be advantageous for the focusing of the magnetic field and in particular for the reduction of parasitic magnetic flux. In this case, the advantageous combination of externally arranged on the pole tube recess and in the radial direction thereto internal puncture at a distance of approximately the axial width of the recess and / or the recess, which may be, for example 0.2 mm to 0.3 mm, especially advantageous. The radial depth of the groove may conveniently be chosen in the range of 0.1 mm. Depending on the design of the hydraulic valve other sizes may be provided.

According to an advantageous embodiment, the pole tube and the valve sleeve may be integrally formed. The hydraulic valve according to the invention, the pole tube and valve sleeve formed integrally formed in a component, has significant advantages in the operation of the hydraulic valve, since possible component deformations and a resulting negative influence on the armature run in the pole tube and thereby caused a magnetic / valve hysteresis can be reduced. By a common, one-piece production of pole tube and valve sleeve coaxiality of polar axis and valve sleeve axis is easier to achieve than in a production of pole tube and valve sleeve as separate components, since assembly inaccuracies play only a minor role. Both axes must therefore be reliably matched during production. This ensures a favorable configuration of the run of the armature in the pole tube and the hydraulic piston in the valve sleeve and an advantageous power transmission from the armature to the hydraulic piston.

Due to the coaxiality of the pole tube and the valve bush, a large immersion depth of the armature in the solenoid of the solenoid part can be realized in a structurally simpler manner, whereby a favorable and effective operation of the hydraulic valve can be ensured. This improves the functioning of the entire hydraulic valve.

The advantageous coaxiality of pole tube and valve bush further favors a reduction of the magnetic transverse forces on the armature, since the most accurate alignment of the armature run in the axis of the solenoid by the one-piece design of pole tube and valve sleeve is easier to achieve.

The one-piece design of pole tube and valve sleeve further allows a reduction in the number of components of the hydraulic valve and consequent simplification of assembly, which contributes to a cost reduction and a lower number of errors in the assembly. Also, the overall operation of the hydraulic valve becomes more reliable because during operation, the risk of component deformation and concomitant functional impairment in valve operation can be reduced. A production of the one-piece component as a turned part is possible in a favorable manner.

Advantageously, the armature can be guided in a recess of the pole tube. In this way, the armature can be favorably aligned and guided in the axis of the solenoid, which is an advantage for an efficient drive of the hydraulic valve. By a favorable production of the pole tube as a rotating part, the recess can be made very accurately with low tolerances and thereby low-friction running of the armature can be ensured in the recess, whereby the response and operating parameters of the hydraulic valve can be improved.

Conveniently, the hydraulic piston can be arranged at an end remote from the armature by means of a spring element at an end facing away from the armature of the valve sleeve. The armature is operatively coupled to the hydraulic piston, in particular mechanically coupled, in particular the armature can be mechanically actuated by the hydraulic piston, e.g. indirectly with a pin (pin), which is arranged between the armature and hydraulic piston, or directly with a piston arranged on the small plunger. By supported on the valve sleeve spring element can be generated in a favorable manner, a restoring force, which favors operation of the magnetic drive of the hydraulic valve as a spring-mass oscillator. As a result, the entire operation of the hydraulic valve is favorably influenced.

Brief description of the drawings

Further advantages emerge from the following description of the drawing. In the drawings, embodiments of the invention are shown. The drawings, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.

They show by way of example:

1 a longitudinal section through a hydraulic valve according to an embodiment of the invention in a basic position;

2 a longitudinal section through a hydraulic valve according to a further embodiment of the invention in a basic position;

3 a partially longitudinally cut hydraulic valve according to an embodiment of the invention; and

4 a cross section through the hydraulic valve 3 in the area of the hydraulic fluid reservoir.

Embodiments of the invention

In the figures, the same or similar components are numbered with the same reference numerals. The figures are merely examples and are not intended to be limiting.

1 shows in a longitudinal section a hydraulic valve 1 , In particular a hydraulic transmission valve in a basic position. It is a pressure control valve.

This hydraulic valve 1 For example, it is used in a dual-clutch transmission. These are valve sockets 5 of hydraulic parts 2 used in several parts similarly constructed hydraulic valves in a control plate of the dual clutch transmission. The valve sockets 5 are designed as turned parts. With the hydraulic parts 2 respectively connected solenoid parts 3 the transmission valves 1 protrude from the control plate and are surrounded by hydraulic fluid. Each of the solenoid parts 3 has a magnetizable housing 4 on.

This in 1 illustrated hydraulic valve 1 includes the solenoid part 3 with the magnetizable housing 4 which is a magnetic coil 7 on an outer circumference 50 and at least a first end face 52 encloses, as well as with one inside the magnetic coil 7 arranged pole tube 6 in which an anchor 10 in an anchor room 56 is provided axially displaceable. Next includes the hydraulic valve 1 the hydraulic part 2 with a hydraulic piston 16 , which axially displaceable in the valve sleeve 5 is guided and by means of which at least one working port A is selectively connectable to a supply port P and a tank port T. The anchor 10 is to drive the hydraulic piston 16 intended. The valve bush 5 is along a longitudinal axis L in extension of the pole tube 6 arranged. The magnetic coil 7 is in the bobbin 8th embedded in the housing 4 for example, received by means of press fit. Alternatively, the solenoid can 7 also with plastic material of the bobbin 8th to be splashed.

How out 1 is apparent, is the valve sleeve 5 in one piece with the pole tube 6 educated provided so that the hydraulic valve 1 has fewer components and the assembly process can be simplified. Due to the coaxiality of pole tube 6 and valve socket 5 also allows a large immersion depth of the anchor 10 in the magnetic coil 7 of the solenoid part 3 implement constructively simpler, creating a favorable and effective operation of the hydraulic valve 1 can be guaranteed. Thus, the operation of the entire hydraulic valve 1 improved.

The advantageous embodiment of the coaxiality of pole tube 6 and valve socket 5 further favors a reduction of the magnetic shear forces on the armature 10 because the most accurate alignment of the armature run in the axis of the solenoid 7 by a one-piece design of pole tube 6 and valve socket 5 easier to reach.

The pole tube 6 has a favorable influence on the magnetic flux, for example, a V-shaped recess 9 on.

The anchor 10 is in an anchor room 56 forming recess 11 of the pole tube 6 provided axially displaceable and has a central channel 12 on, which is designed as a bore. This central channel 12 is with a heel at the front end of the anchor 10 to a recess 13 enlarged diameter, which is also designed as a bore. In this larger recess 13 is an anti-adhesive 14 used, the one or more eccentric to the longitudinal axis L arranged small throttle apertures 15 having the armature space with the central channel 12 connect. The anti-stick disc 14 prevents sticking of the anchor 10 at the magnetically conductive valve socket 5 of the hydraulic part 2 at a fully disengaged anchor 10 ,

The hydraulic part 2 indicates the hydraulic piston 16 on, the axially displaceable in the valve sleeve 5 is guided. The hydraulic piston 16 is at an anchor 10 opposite end 60 by means of a spring element 17 at the valve socket 5 arranged supported. Here is the hydraulic piston 16 against the force of the spring element designed as a helical compression spring 17 slidable, located on one, in the valve sleeve 5 attached sieve 21 supported. For guiding and centering the helical compression spring 17 has the sieve 21 a spring leadership 22 on. Depending on the position of the hydraulic piston 16 is the working port A by means of a circumferential annular groove 18 and longitudinal and transverse bores 20 . 19 in the hydraulic piston 16 connectable to the supply connection P or the tank connection T.

Is the hydraulic piston located 16 in the absence of applying a sufficiently large voltage to the magnetic coil 7 in the basic position according to 1 , Thus, the hydraulic fluid from the working port A to the tank outlet T is performed.

The axial force transmission between the armature 10 and the hydraulic piston 16 done by means of a pin 23 , which is in the valve sleeve 5 is arranged guided. The pin 23 allows decoupling between anchor and piston bearings. A circumferential recess on its circumference 24 , which as circumferential on the circumference annular groove 68 is formed, thereby allowing a reduction of the bearing surface, whereby the friction can be reduced. At the same time advantageously only axial forces through the pin 23 transferred and the tolerance situation is also significantly improved. For a possible frictionless power transmission, the hydraulic piston 16 and the anti-stick disc 14 Ball-domes on. To simplify these two components, it is alternatively conceivable, a pad-reducing structure, preferably rounded end faces, in particular ball crests, on the pin 23 train.

As 1 is further to be seen, is a pole disk 28 in the bobbin 8th integrated provided, for example, by the plastic material of the bobbin 8th is at least partially encapsulated, or by recesses of the pole disk 28 be injected. As a result, a smaller axial space can be achieved and the assembly of the hydraulic valve 1 is simplified. The pole disk 28 serves as magnetic termination of the magnetizable housing 4 which is the magnet coil 7 on the outer circumference 50 and on at least one end face 52 encloses, on the hydraulic piston 16 opposite end face 54 the solenoid 7 , The pole disk 28 can be designed as a magnetizable, for example disc-shaped or annular, body with recesses for cable penetrations, wherein the recesses may be, for example, holes.

The bobbin 8th closes the anchor space 56 at one end of the hydraulic valve 1 from. In the process form into the anchor space 56 protruding projections 25 a stop for the anchor 10 so that the reduced contact surface thereby has an anti-adhesive effect.

One in the bobbin 8th provided hydraulic fluid reservoir 26 , which is preferably filled once initial, is related to the anchor space 56 and prevents air from entering the hydraulic valve 1 , Furthermore, it prevents the possibility of shifting the hydraulic fluid into the reservoir 26 an additional unwanted damping.

The reservoir 26 is dimensioned such that the volume shift caused by the Pinhub is significantly lower than the reservoir volume. This will be the dirt entry into the anchor space 56 reduced.

To a caused by foreign bodies short circuit between a fork, not shown 35 and the pole disk 28 To prevent, the hydraulic valve points 1 Furthermore, a chip protection cover 27 on, which with ribs the Polscheibe 28 covers. The fork plug 35 is also partially in the bobbin 8th provided injected, allowing a secure attachment of the fork plug 35 and thus a secure contact can be ensured.

For improved connection of the coil wire 37 to a pin 36 the fork plug 35 becomes the coil wire 37 around the pin 36 the fork plug 35 wound. Subsequently, a welding sleeve 108 over the wrapped pin 36 plugged and pin 36 and coil wire 37 are suitably connected by means of compression and resistance welding.

The housing 4 which is the pole disk 28 towers over, in addition to the pole disk 28 caulked. The housing 4 is used during assembly via an outer circumference of the pole disk 28 pushed and is for example on the pole disk 28 fixed via a press fit. For additional attachment of the housing 4 on the pole disk 28 In addition, a caulking of the housing 4 be effected via suitable Verstemmungssegmente, which by means of a suitable tool from the housing 4 scraped off and / or bent over and onto the pole disk 28 be pressed. As a result, a purely axial caulking of the housing 4 on the pole disk 28 reach, so that any forces acting in a caulking transverse forces are reduced. Such caulking provides additional protection of the attachment of housing 4 and pole disc 28 dar. Alternatively or additionally, it is conceivable that the housing 4 with the pole disk 28 welded is provided. For example, the pole disk 28 in the axial direction to the housing 4 be provided subsequently and in this way on an outer side flush with the housing 4 be welded.

2 is a longitudinal section of a second embodiment of a hydraulic valve according to the invention 1 to be taken in basic position. On a repeated description of the same components as in 1 is omitted and to avoid unnecessary repetition on their description 1 directed. At the in 2 illustrated embodiment are pole tube 6 and valve socket 5 executed as two components. The valve bush 5 of the second embodiment has a shorter end portion 46 the hydraulic bush 5 on, in the pole tube 6 is introduced.

In contrast to the first exemplary embodiment, the working connection A is connected to the supply connection P in the basic position shown. For this one spans in a recess 41 of the pole tube 6 recorded spring 40 the anchor 10 in the direction of the hydraulic part 2 in front. In a recess 32 of the anchor 10 is a spring plate 43 pressed in, which is the spring 40 leads and at the same time by a circumferential radial projection 44 serves as a stop and Antiklebeeibe. The spring plate 43 is advantageously formed by deep drawing from sheet metal. Due to the shorter length of the anchor 10 due to the spring 40 is the pin 23 made shorter for axial power transmission.

In 3 is a partially longitudinally cut hydraulic valve 1 illustrated according to an embodiment of the invention. The bobbin 8th , which is in the cut part of the housing 4 can be seen, can be made as a plastic injection molded part, which by encapsulation of the magnetic coil 7 is made. Inside the bobbin 8th is a recess that can be seen as an anchor space 56 for receiving the pole tube 6 is provided. Also in the bobbin 8th the pole disk is injected 28 as magnetic termination of the solenoid part 3 , The bobbin 8th has at its the hydraulic part 2 opposite end of the hydraulic fluid reservoir 26 on that over in 4 shown holes 110 with the anchor room 56 is in fluid communication. The anchor 10 has the central channel 12 on, the hydraulic fluid continues into the front part of the armature space 56 and can lead to the hidden in the representation of stroke volume of the pin.

The chip guard cover 27 forms a cover or labyrinth for a suction point of the hydraulic reservoir 26 so that the suction point is covered up and hydraulic fluid is sucked or filled over corner or over the labyrinth and so a dirt entry into the hydraulic reservoir 26 and thus in the associated anchor space 56 is reduced.

Advantageous is the hydraulic reservoir 26 also at the end of the solenoid part 3 arranged, which is the hydraulic part 2 is turned away, so that swirled by the prevailing there lower flow of hydraulic fluid less dirt and into the armature space 56 can be entered.

Because the hydraulic reservoir 26 as a hollow body in the example produced as an injection molded bobbin 8th is formed, the hydraulic reservoir 26 Without additional tools and thus produced largely cost-neutral.

Also is in 3 in the bobbin 8th injected fork plugs 35 refer to. The plug-side part of the bobbin 8th is from the chip guard cover 27 against the penetration of foreign bodies, such as metallic abrasion, from the hydraulic fluid and possible electrical short circuits in the contacting of the magnetic coil 7 and the fork plug 35 protected.

The largest part of the housing 4 and the hydraulic part 2 of the hydraulic valve 1 are shown in plan view from the outside.

4 shows a cross section through the hydraulic valve 1 out 3 along the line IV-IV in the area of the hydraulic fluid reservoir 26 , In the central part of the hydraulic valve 1 is as a recess in the housing 4 arranged bobbin 8th the U-shaped hydraulic fluid reservoir 26 to recognize. In the right direction leg of the hydraulic fluid reservoir 26 are two holes 110 arranged, which the fluid connection to the underlying armature space 56 represent. About these holes 110 can the hydraulic fluid from the reservoir 26 in the anchor room 56 enter and also flow back again.

How out 3 and 4 seen, is the bottom of the hydraulic reservoir 26 arranged significantly lower than the lower walls of the connecting holes in the intended installation position shown 110 in the anchor room 56 , causing a dirt entry into the anchor space 56 can be reduced because possibly located in the hydraulic fluid dirt sinks and at the bottom of the hydraulic reservoir 26 can settle.

On both sides of the hydraulic fluid reservoir 26 the pins protrude 36 the fork plug 35 from the bobbin 8th which, for contacting the coil wire of the magnetic coil 7 by means of welding sleeves 108 serve. In the upper part of the hydraulic valve 1 protrude the jaws 102 of the fork plug from the bobbin 8th out. To the jaws 102 can be a suitable mating connector for controlling the solenoid coil 7 be connected.

The features described do not necessarily have to be combined and can also be used individually in a hydraulic valve.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102011053023 A1 [0003, 0005]

Claims (14)

Hydraulic valve ( 1 ), in particular a hydraulic transmission valve, comprising - a solenoid part ( 3 ) with a magnetizable housing ( 4 ), which is a magnetic coil ( 7 ) on an outer circumference ( 50 ) and at least a first end face ( 52 ), and with one inside the magnetic coil ( 7 ) arranged pole tube ( 6 ), in which an anchor ( 10 ) in an anchor space ( 56 ) is axially displaceable, - a hydraulic part ( 2 ) with a hydraulic piston ( 16 ) which is axially displaceable in a valve bushing ( 5 ) and by means of which at least one working connection (A) can optionally be connected to at least one supply connection (P) and at least one tank connection (T), the anchor ( 10 ) for driving the hydraulic piston ( 16 ) is provided, wherein the valve sleeve ( 5 ) along a longitudinal axis (L) in extension of the pole tube ( 6 ), and wherein a hydraulic fluid reservoir ( 26 ) in a bobbin ( 8th ) is provided, which with the armature space ( 56 ) is in fluid communication Hydraulic valve according to claim 1, wherein an axial force transmission between armatures ( 10 ) and hydraulic pistons ( 16 ) by means of a separately formed pin ( 23 ), where the pin ( 23 ) in particular in the valve bushing ( 5 ) is provided guided. Hydraulic valve according to claim 2, wherein in normal operation by a stroke volume of the pin ( 23 ) effected volume exchange of the hydraulic fluid with the hydraulic fluid reservoir ( 26 ) is provided. Hydraulic valve according to claim 2 or 3, wherein a capacity of the hydraulic fluid reservoir ( 26 ) a multiple of the stroke volume of the pin ( 23 ) is. Hydraulic valve according to one of the preceding claims, wherein a chip protection cover ( 27 ) is provided, wherein a part of the hydraulic reservoir ( 26 ) in the chip protection cover ( 27 ) and / or the chip protection cover ( 27 ) as a cover for the hydraulic reservoir ( 26 ) serves. Hydraulic valve according to one of the preceding claims 1 to 4, wherein a chip protection cover ( 27 ) provided with ribs ( 39 ) the pole disk ( 28 ) and / or a cover or a labyrinth over a suction point of the hydraulic reservoir ( 26 ). Hydraulic valve according to one of claims 2 to 6, wherein the pin ( 23 ) at its periphery a recess ( 24 ) for reducing its longitudinal support surface, in particular wherein the recess ( 24 ) circumferentially as an annular groove ( 68 ) is trained. Hydraulic valve according to one of the preceding claims, wherein a pole disk ( 28 ) and / or a fork plug ( 35 ) in a bobbin ( 8th ) is provided integrated. Hydraulic valve according to claim 8, wherein the housing ( 4 ) on the pole disk ( 28 ) or with the pole disk ( 28 ) is provided welded. Hydraulic valve according to claim 8 or 9, wherein a coil wire ( 37 ) of the magnetic coil ( 7 ) around a pin ( 36 ) of the fork plug ( 35 ) is provided and the coil wire ( 37 ) and the pin ( 36 ) are pressed and welded by means of a welding sleeve. Hydraulic valve according to one of claims 8 to 10, wherein the bobbin ( 8th ) in the anchor space ( 56 protruding projections ( 25 ) as a stop for the anchor ( 10 ) having. Hydraulic valve according to one of the preceding claims, wherein the armature ( 10 ) by means of a spring ( 40 ) in the direction of the hydraulic part ( 2 ) is biased and for guiding the spring ( 40 ) a spring plate ( 43 ) in a recess ( 32 ) of the anchor ( 10 ) is pressed, wherein the spring plate ( 43 ) is provided by deep drawing formed from sheet metal and a circumferential radial projection ( 44 ) as a stop and Antiklebescheibe. Hydraulic valve according to one of the preceding claims, wherein the pole tube ( 6 ) in a arranged in its outer periphery, preferably V-shaped, incision ( 9 ) a radially circumferential recess ( 29 ) as a fine control contour. Hydraulic valve according to one of the preceding claims, wherein the pole tube ( 6 ) and the valve sleeve ( 5 ) are integrally formed.

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