Overmolded or pressed-in sleeve for hydraulic routing of solenoid
A valve having a metal insert with a fluid passage formed in the metal insert. A composite valve body is disposed at least partially around the metal insert and having at least one port in fluid communication with the fluid passage with the metal insert. A valve member is partially disposed in the metal insert and operable to control the fluid flow through the fluid passage of the metal insert and parts of the valve body.
1. A solenoid pressure control valve comprising:
a metal insert having a fluid passage formed in said metal insert with upper and lower internal bearings;
a composite valve body disposed at least partially around said metal insert;
a supply port disposed through said composite valve body and said metal insert, wherein said supply port is connected to said fluid passage;
a control port disposed through said composite valve body and said metal insert, said control port being connected to said fluid passage;
an exhaust port disposed through said composite valve body and said metal insert, said exhaust port being connected to said fluid passage;
a spool valve member at least partially disposed and aligned in said metal insert for controlling the flow of fluid medium between said supply port and said control port, wherein said valve member has a bore extending at least partially through said valve member for providing flow between said supply port and said control port;
two or more metering orifices extending through said valve member between said bore and said fluid passage;
metering lands positioned between upper and lower bearings, said metering lands having upper and lower flat metering edges engaged to said metering orifices, wherein said valve member controls the flow of fluid between said control port and either said supply port or said exhaust port by moving with respect to said metering lands;
a solenoid portion having a coil with an armature moveable within said solenoid portion in response to the energization of said coil, wherein said armature is operably configured to contact said valve member and causes said valve member to slide within said fluid passage; and
a spring operably connected to said armature for biasing said armature in one direction when said coil is not energized.
2. The solenoid pressure control valve of claim 1 , wherein said composite valve body is composed of a thermoplastics material.
3. A method of making a solenoid pressure control valve comprising:
providing a metal insert having a fluid passage formed in said metal insert with upper and lower internal bearings;
providing a composite valve body disposed at least partially around said metal insert;
providing a supply port disposed through said composite valve body and said metal insert, wherein said supply port is connected to said fluid passage;
providing a control port disposed through said composite valve body and said metal insert, said control port being connected to said fluid passage;
providing an exhaust port disposed through said composite valve body and said metal insert, said exhaust port being connected to said fluid passage;
providing a spool valve member at least partially disposed and aligned in said metal insert for controlling the flow of fluid medium between said supply port and said control port, wherein said valve member is a bore extending at least partially through said valve member for providing flow between said supply port and said control port;
providing two or more metering orifices extending through said valve member between said bore and said fluid passage;
providing a metering lands positioned between said upper and lower bearings, said metering lands having upper and lower flat metering edges engaged to said metering orifices, wherein said valve member controls the flow of fluid between said control port and either said supply port or said exhaust port by moving with respect to said metering lands; and
providing a solenoid portion having a coil with an armature moveable within said solenoid portion in response to the energization of said coil, wherein said armature is operably configured to contact said valve member and causes said valve member to slide within said fluid passage in response to energization of said solenoid portion; and
providing a spring operably connected to said armature for biasing said armature in one direction when said coil is not energized.
4. The method of claim 3 wherein said step of providing a composite valve body disposed at least partially around said metal insert is accomplished one of the following:
overmolding said composite valve body around said metal insert; and
press-fitting said metal insert into said composite valve body.
5. The method of claim 3 , wherein said composite valve body is composed of a thermoplastics material.