Electromagnetic pressure regulating valve

An electromagnetic pressure regulating valve comprising:

• a valve sleeve and a valve member slidably mounted in said valve sleeve for regulating the pressure of an oil fed thereto;
• a hollow core having an interior surface defining a bore extending therethrough;
• a coil surrounding said core;
• a shaft abutting said valve member, said shaft having an outer cylindrical surface and being slidably mounted in said bore;
• a plunger fixed to said shaft, said plunger being drawn in a first direction, toward said core, responsive to receipt of electric current by said coil, thereby extending said shaft;
• biasing means for biasing said plunger in a second direction, opposite said first direction;
• a bushing mounted in said bore for supporting said shaft, said bushing having an inner cylindrical surface formed of a resinous material and in mating, sliding contact with said outer cylindrical surface of said shaft;
• a case housing said plunger, said hollow core and said coil;
• a first oil space defined between said case and said core at one end of said core;
• a second oil space defined by said valve sleeve at an end of said core opposite said one end;
• and
• an oil passage for circulating a lubricant between said first and second oil spaces, across the length of said bushing and through an area between said bushing and said shaft.