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Pressure control valve and method for making a pressure control valveRelated Patent Categories: Metal Working, Method Of Mechanical Manufacture, Valve Or Choke Making, With Assembly, Disassembly Or Composite Article Making, With Material Shaping Or Cutting, Including Molding Or CastingPressure control valve and method for making a pressure control valve description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060236540, Pressure control valve and method for making a pressure control valve. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001] The present invention relates to a pressure control valve as well as a method for making a pressure control valve. [0002] Such a pressure control valve is known in practice, and in particular, is designed for use with a hydraulic servo circuit of an automatic transmission of a motor vehicle, whereby, by means of the pressure control valve, the pressure is adjusted in a servo circuit. Via the fluid pressure, a slide valve or the like can be actuated, which serves for activating a coupling or switching operation. This type of known pressure control valve includes a valve unit extruded from plastic, in which hydraulic channels are formed. A fluid flow flowing between the hydraulic channels can be controlled by means of a valve closing member. [0003] The valve closing member cooperates with a piston or slide valve, which can be actuated by means of an actuator unit arranged coaxially to the valve unit. The actuator unit is formed generally as an electromagnetic actuator unit, which includes a magnetic coil, a magnetic core, or pole core, as well as an armature, which cooperates with the piston or slide valve for actuation of the valve closing member. The valve unit, which is formed as a type of flange, is extruded onto the magnetic core of the actuator unit. The valve unit of the known pressure control valve includes an inner hydraulic area in which the hydraulic channels are formed. On the inner hydraulic area, a so-called filter cap is attached, which serves as a sealing element and is sealed by means of an adhesive connection. [0004] Manufacturing the adhesive connection, however, is technically expensive. In addition, the adhesive connection has the disadvantage that with dramatic temperature fluctuations in temperature, a sufficient sealability cannot be achieved. [0005] In addition, it is known to make a valve part of a pressure control valve of the above-described type from multiple injection-molded parts, which are connected to one another with an ultra-welding method or also by a laser welding method. [0006] Also, these types of sealing methods are expensive, however, and do not permit an adequate sealability under all conditions of use. SUMMARY OF THE INVENTION [0007] The pressure regulating valve of the present invention, in which the fluid channels and the valve chambers are formed on a preform that is injected into a flange, has the advantage that all areas required for pressure control are formed on the preform and no sealing points between the preform representing the inner hydraulic region and the outer region of the flange, representing the outer hydraulic region of the valve part, are available, since by the extrusion coating of the preform, a hermetic seal between the preform and the flange can be obtained. [0008] Advantageously, also no further sealing method is required, such as, for example, an ultra-welding method, a laser-welding method, or an adhering method, in order to obtain the required sealability between the inner and outer hydraulic regions. [0009] The pressure control valve of the present invention can operate as a pressure control with a decreasing flow-force characteristic line, as well as a pressure control with an increasing flow-force characteristic line. The actuator unit can be an electromagnetic actuator unit, which commonly is formed with a coil, a magnetic core, and an armature. The flange can be extruded onto the magnetic core. [0010] As already noted, the preform of the pressure valve of the present invention represents the inner hydraulic region of the pressure control valve. It includes the fluid channels, via which the control of the fluid flow between the supply port and the consumer port takes place. The flange surrounding the preform represents the outer hydraulic region of the valve part and includes the connections or connecting channels to at least one pressure source, which, for example, is a hydraulic cylinder, and to a consumer, such as a slide valve for actuation of a switching element of an automatic transmission. [0011] A pressure control valve used in an automatic transmission generally has a return port, which is connected with a tank for hydraulic oil, whereby a fluid flow flowing to the return port can be controlled by means of a closure element, which cooperates with a seating plate and is secured to a piston or slide valve for actuation of the valve closing member. The seating plate, typically made from metal, can be a component of the preform and upon manufacture of the preform, represents an insert part, which is oriented at a right angle to the longitudinal axis of the valve unit. [0012] With one advantageous embodiment of the pressure control valve of the present invention, the preform has at least one, preferably two planes of symmetry arranged at a right angle to one another and parallel to the longitudinal axis of the pressure control valve. In this regard, the preform, after extrusion coating with the flange; has a minimum deformation tendency, which in contrast to an asymmetrical form of the inner hydraulic region, leads to better hydraulic performance of the entire pressure control valve. [0013] The actuation of the valve closing member takes place preferably by means of a slide valve, which penetrates through the preform at least partially. The stroke of the slide valve can be adjusted by means of the actuator unit. [0014] The valve closing member preferably is formed as a sphere, so that the pressure regulating valve represents a so-called LMK (leakage minimized by sphere ("Kugel")) pressure control, with which no leakage occurs in the normal or idle position of the sphere, that is, upon contact of the sphere on its valve seat. Thus, no energy loss occurs by means of possible flowing fluid or hydraulic oil. [0015] The invention also relates to a method for making a pressure control valve with a valve unit extruded from plastic, which serves for control of a fluid flow between a supply port and a consumer port and in which fluid channels are formed. [0016] For permitting a high stability of the pressure control valve and to obtain a high sealability, first an injection-molded preform is made with the method of the present invention, on which the fluid channels are formed. Subsequently, the preform is extrusion-coated with a flange, on which the consumer port and the supply port are formed. [0017] The sealability of the valve part is achieved, therefore, according to a method, which equals a so-called 2K (two Components)-extrusion-coating method. The hermetic sealing of the preform representing the hydraulic region takes place by means of the superficial fusing and welding of the edge layer of the preform upon extrusion-coating with the flange. The plastic of the preform can be identical with the plastic of the flange. It is also contemplated, however, that the two plastics are different, for example, such as in their glass fiber content. [0018] A particularly high sealability between the preform and the flange is achieved when the preform is removed from the mold at a temperature of 120.degree. C. and is extrusion-coated with the flange at this temperature. [0019] The manufacturing of the pressure control valve of the present invention takes place preferably in an extrusion die, which has a first mold cavity for injection of the preform, as well as a second mold cavity for extrusion of the preform with the flange. The conversion of the preform from the first into the second mold cavity takes place, then, by means of a planetary gear, so that the preform is rotated upon conversion 90.degree. relative to the juncture plane of the extrusion die. In this manner, a correct orientation of the ports of the flange to the fluid channels of the preform is ensured. [0020] Upon extrusion-coating of the preform, the openings of the fluid channels and the valve chamber are sealed, which takes place by means of die pushing devices. In this manner, the mouths of the channel, respectively, are sealed with a slide tongue, while the valve chamber is sealed with two slide tongues. [0021] Before the extrusion-coating of the preform with the flange, the valve closing member can be inserted in the preferably blind-hole type valve chamber of the preform. [0022] Further advantages and advantageous forms of the subject matter of the present invention can be derived from the description, the drawings, and the patent claims. Continue reading about Pressure control valve and method for making a pressure control valve... Full patent description for Pressure control valve and method for making a pressure control valve Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Pressure control valve and method for making a pressure control valve patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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