Control valve apparatus
AssigneeNidec Tosok Corporation
InventorsHiroki ISHII, Weiming CHEN
Life of this patent
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Abstract
A strip-shaped filter in the shape of a circular arc is arranged at a port opening portion of an oil passage, the port opening portion being in maximum proximity to a spool hole portion or a valve element, to prevent a contaminant in the oil passage from reaching the spool hole portion or the valve element. A groove portion is arranged to extend in a circumferential direction in a wall surface of the upper body which defines the spool hole portion. The port opening portion is defined in the groove portion, and is connected to the oil passage. The filter is housed in the groove portion to close the port opening portion defined in the groove portion.
Claims6
A control valve apparatus comprising:
- a control valve body including a lower body and an upper body placed above the lower body, the upper body having defined therein an oil passage and a columnar spool hole portion connected to the oil passage;
- a columnar valve element arranged to be capable of moving in an axial direction of the spool hole portion in the spool hole portion;
- and
- a solenoid attached to the control valve body, and arranged to be in contact with the valve element to move the valve element;
- wherein the upper body includes a wall surface arranged to define the spool hole portion, and a groove portion defined in the wall surface and arranged to extend in a circumferential direction;
- the groove portion has a port opening portion connected to the oil passage defined therein;
- and
- the groove portion has housed therein a strip-shaped filter in a shape of a circular arc and arranged to close the port opening portion defined in the groove portion.
Dependencies are inferred from the claim text.